阅读说明：本技术 印刷特性优异的装饰材料及其制造方法 (Decorative material having excellent printing characteristics and method for producing same ) 是由 李汉娜 金宪助 梁世螺 于 2019-07-15 设计创作，主要内容包括：本发明涉及印刷特性优异的装饰材料,本发明的装饰材料包括油墨接收层,该油墨接收层具有呈枝晶形状的放射形微细曲折结构,从而改善印刷在油墨接收层上的油墨的吸收性和/或固着性,即印刷适性,清晰度出色,因此审美效果优异。此外,由于油墨接收层是通过UV固化来制造的,所以它可以直接涂布在基材层上,并且可以包括各种基材层；并且由于它是使用无溶剂型树脂组合物而不使用有机溶剂来制造的,并且相对于水溶性油墨具有优异的吸收性和/或固着性,具有环境友好的优点。(The present invention relates to a decorating material having excellent printing characteristics, which includes an ink-receiving layer having a dendritic-shaped radial fine meandering structure, thereby improving the absorption and/or fixation properties, i.e., printability, of ink printed on the ink-receiving layer, and having excellent visibility, and thus having excellent aesthetic effects. Further, since the ink-receiving layer is manufactured by UV curing, it may be directly coated on a base material layer, and may include various base material layers; and has an advantage of being environmentally friendly since it is manufactured using a solventless resin composition without using an organic solvent and has excellent absorption and/or fixation properties with respect to water-soluble inks.)

1. A decorative material is characterized in that the decorative material,

comprises a substrate layer, an ink receiving layer and a printing layer;

the ink receiving layer includes an ink receiving layer of an acrylic resin composition having a dendritic shape which is a radial meander structure having a point on a surface as a center and extending from the center to a peripheral portion; and

when the surface was observed with an optical microscope, it was at 0.1cm²The average size of ink droplets present in a unit area of (2) is 50 μm or less.

2. The upholstery material as claimed in claim 1,

20-400 of the radial meander structures are present per 1mm x 1mm of unit area of the surface.

3. The upholstery material as claimed in claim 1,

the average diameter of the radial zigzag structure is 5-500 μm.

4. The upholstery material as claimed in claim 1,

the surface roughness Rz of the ink-receiving layer is 0.5 μm to 10 μm on average.

5. The upholstery material as claimed in claim 1,

the ink-receiving layer has an average static water contact angle of 5 ° to 60 °.

6. The upholstery material as claimed in claim 1,

also includes a transparent layer on the printed layer.

7. A manufacturing method of a decorative material is characterized by comprising the following steps:

irradiating the acrylic resin composition coated on the base material layer with ultraviolet rays to form an ink-receiving layer having a dendrite shape which is a radial meandering structure having a point on a surface as a central portion and extending from the central portion to a peripheral portion; and

on the formed ink-receiving layer, a printed layer is formed with ink,

wherein the step of forming the printed layer is performed at a printing speed of 50m/min to 150 m/min.

8. The method for manufacturing a decorative material according to claim 7,

the light irradiation step includes:

a first light irradiation step of irradiating light having a wavelength of 200nm or less to the acrylic resin composition coated on the base material layer under an inert gas condition to activate the composition; and

and a second light irradiation step of irradiating the activated composition with light having a wavelength of 200nm to 400nm under air conditions to cure the composition to form an ink-receiving layer.

9. The method for manufacturing a decorative material according to claim 8,

the first light irradiation step is carried out at 1mJ/cm²～150mJ/cm²Is carried out under the light irradiation amount of (3).

10. The method for manufacturing a decorative material according to claim 8,

the first light irradiation step is performed with oxygen (O)₂) Nitrogen gas (N) with a concentration of 10ppm to 3500ppm₂) Under the condition of the reaction.

11. The method for manufacturing a decorative material according to claim 7,

the acrylic resin composition comprises:

100 parts by weight of a urethane (meth) acrylic oligomer;

30-90 parts by weight of an acrylic monomer having a hydrophilic functional group; and

50 to 150 parts by weight of a polyfunctional acrylic monomer.

12. The method for manufacturing a decorative material according to claim 8,

the acrylic resin composition further comprises at least one filler selected from the group consisting of silica, alumina, glass beads and organic beads.

13. The method for manufacturing a decorative material according to claim 12,

the content of the filler is 15 parts by weight or less based on 100 parts by weight of the acrylic resin composition.

14. The method for manufacturing a decorative material according to claim 7,

the acrylic resin composition has a viscosity of 500cps or less.

15. The method for manufacturing a decorative material according to claim 7,

further comprising the step of forming a transparent layer on the printing layer after the step of forming the printing layer.

Technical Field

The present invention relates to a decorating material having excellent printing performance and a method of manufacturing the same, and more particularly, to a decorating material having excellent printing definition and printability even in high-speed printing, which provides an ink-receiving layer having hydrophilicity and high surface area by including a specific surface structure, and a method of manufacturing the same.

Background

In recent years, interest in interior decoration has been increasing, and a demand for a decorative material having excellent design has also been increasing. Conventionally, in order to impart a pattern to decorative materials such as wallpaper and floor, a method of forming a printed layer so as to form a desired pattern on a base material layer of wallpaper or floor material is used. In this case, in order to manufacture a decorative material having high designability, it is important to accurately and clearly form a printed layer on the base material layer.

Paper is widely used as a base material layer for forming the printed layer, and when paper is used as the base material layer, there is no great difficulty in forming the printed layer on the base material layer. However, depending on the type of the base material layer, the ink forming the printed layer may not adhere well to the base material layer, and thus the design exhibited by the printed layer may not be expressed accurately, and the appearance quality of the entire decorating material may be greatly impaired. In order to solve this problem, korean patent application laid-open No. 2017-0075912 discloses a technique of introducing an ink-receiving layer capable of receiving ink of a printing layer between a substrate and the printing layer, and then forming the printing layer on the substrate layer.

However, since the above-described technology has a method of forming an ink-receiving layer by thermal drying or thermal curing under a temperature condition of 80 ℃ or more, when a base material layer having weak heat resistance such as polyvinyl chloride (PVC) is used, the base material layer may be curled, and in order to prevent this, it is necessary to adopt a method of transferring the prepared ink-receiving layer without directly forming the ink-receiving layer on the base material layer, so that there is a limitation in process.

Therefore, there is a need to develop a decorating material which has excellent clarity, and can directly form an ink-receiving layer regardless of the kind of a base material layer, and has ink absorbability and/or fixability, i.e., printability.

Disclosure of Invention

Technical problem

An object of the present invention is to provide a decorating material capable of directly forming an ink-receiving layer regardless of the kind of a base material layer and having excellent printability and definition, and a method for manufacturing the same.

Technical scheme

Accordingly, in one embodiment, the present invention provides a trim material comprising:

the ink receiving layer comprises a base material layer, an ink receiving layer and a printing layer;

the ink receiving layer includes an ink receiving layer of an acrylic resin composition having a dendritic shape which is a radial meander structure having a point on a surface as a center and extending from the center to a peripheral portion; and

when the surface was observed with an optical microscope, it was at 0.1cm²The average size of ink droplets present in a unit area of (2) is 50 μm or less.

In one embodiment, the present disclosure also provides a method of manufacturing a trim material, comprising the steps of:

irradiating the acrylic resin composition coated on the base material layer with ultraviolet rays to form an ink-receiving layer having a dendrite shape which is a radial meandering structure having a point on a surface as a central portion and extending from the central portion to a peripheral portion; and

on the formed ink-receiving layer, a printed layer is formed with ink,

wherein the step of forming the printed layer is performed at a printing speed of 50m/min to 150 m/min.

Effects of the invention

The decorating material according to the present invention includes an ink-receiving layer having a radial micro-tortuous structure in a dendritic shape, thereby improving the absorption and/or fixation properties, i.e., printability, of ink printed on the ink-receiving layer, and is excellent in definition and thus excellent in aesthetic effects.

Further, since the ink receiving layer is manufactured by UV curing, it may be directly coated on the base material layer, or may include various kinds of base material layers; since the solvent-free resin composition is manufactured using a solvent-free resin composition without an organic solvent, it has excellent absorption and/or fixation properties with respect to water-soluble inks, and has an advantage of being environmentally friendly.

Drawings

FIG. 1 is a schematic view of a photo-curing device for manufacturing an ink-receiving layer of the present invention.

Fig. 2 and 3 are Scanning Electron Microscope (SEM) images of the surface of the ink-receiving layer of example 1 of the present invention.

Fig. 4 is a Scanning Electron Microscope (SEM) image of the ink-receiving layer surface of comparative example 4 of the present invention.

Fig. 5 is a photographic image of the surface of the upholstery material of example 1 and comparative examples 1 to 3.

Fig. 6 is an image obtained by photographing the surfaces of the finishing materials of example 1 and comparative examples 1 to 4 at a magnification of 5 times using an optical microscope.

Detailed Description

In the present invention, various modifications may be made and various embodiments may be provided, and specific embodiments will be shown in the drawings and described in detail in the detailed description.

It should be understood, however, that there is no intention to limit the invention to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It will be understood that the terms "comprises" and "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

It will also be appreciated that for ease of description, the drawings may be scaled up or down.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, and the same or corresponding components are given the same symbols regardless of the figure numbers, and a repetitive description thereof will be omitted.

In the present invention, "surface roughness" indicates the degree of fine peaks and valleys existing on the surface, and may be expressed as "Rz". Here, "Rz" denotes a portion of a deviation average line by taking the reference length L as a cross-sectional curve of the surface and measuring the interval between the peak from the high side to the fifth peak and the valley from the deeper side to the fifth valley of the meander structure on a straight line not passing through the cross-sectional curve parallel to the surface, and is also referred to as "ten-point average roughness".

In the present invention, the unit "T" is a unit representing the thickness of a layer constituting a film, sheet or laminate, and may be the same as the unit "mm".

The invention relates to a decorative material and a manufacturing method thereof.

In recent years, interest in interior decoration has been increasing, and a demand for a decorative material having excellent design has also been increasing. Conventionally, in order to impart a pattern to a decorative material such as wallpaper and flooring material, a method of forming a printed layer so as to form a desired pattern on a base material layer of the wallpaper or flooring material is used. In this case, in order to manufacture a decorative material having high designability, it is important to accurately and clearly form a printed layer on the base material layer.

However, depending on the type of the base material layer, the ink forming the printed layer may not adhere well to the base material layer, and thus the design represented by the printed layer may not be expressed accurately, and the appearance quality of the entire decorating material may be greatly impaired. In addition, in order to solve such problems, the conventional art of introducing an ink-receiving layer between a base material layer and a printed layer mostly forms the ink-receiving layer by thermal drying or thermal curing under a temperature condition of 80 ℃ or more, and thus, when a base material layer having weak heat resistance such as polyvinyl chloride (PVC) is used, the base material layer is curled, and in order to prevent curling, it is necessary to apply a method of transferring the ink-receiving layer that has been prepared without directly forming the ink-receiving layer on the base material layer, and thus, there is a limitation in processes.

Accordingly, the present invention provides a decorating material having excellent printing performance and a method for manufacturing the same.

Since the decorating material according to the present invention includes the ink-receiving layer having the radial micro-tortuous structure in the shape of dendrites, thereby improving the absorption and/or fixation, i.e., printability, of the ink printed on the ink-receiving layer, having excellent definition, thereby having excellent aesthetic effects, and at the same time, it has an advantage of being environmentally friendly since it is manufactured using the solvent-free resin composition and the water-soluble ink.

Hereinafter, the present invention will be described in more detail.

Decorative material

In one embodiment of the present invention, there is provided a finishing material including:

a substrate layer; and

an ink receiving layer having a dendritic shape that is a radial meander structure with a point on a surface as a center and extending from the center to a peripheral portion.

The decorating material of the present invention comprises an ink-receiving layer of a composition comprising an acrylic oligomer on a base material layer, the ink-receiving layer comprising a meandering structure having a specific shape on a surface thereof. Specifically, the decorative material includes, on the outermost side thereof, an ink-receiving layer having a fine meandering structure on the surface thereof, the meandering structure having a structure in which the radiating concavities and convexities are randomly distributed, the radiating concavities and convexities extending from the center portion toward the peripheral portion and decreasing in height from the center portion toward the peripheral portion with an arbitrary point existing on the surface of the ink-receiving layer as the center portion. For example, the radiating tortuous structure may include a tree-like structure or a randomly distributed structure of dendrites centered at any point on the surface of the ink-receiving layer.

Furthermore, the surface properties, in particular the printability, of the radial meander structure can be adjusted by its size or height, and for this purpose the radial micro meander structure can be controlled to have an average diameter within a certain range. Specifically, the average diameter of the radial meandering structure represents the average size of the individual radial meandering structures present on the surface of the ink-receiving layer, and may be 5 μm to 500 μm, more specifically 5 μm to 450 μm, 5 μm to 400 μm, 5 μm to 350 μm, 5 μm to 300 μm, 5 μm to 250 μm, 5 μm to 200 μm, 5 μm to 150 μm, 5 μm to 100 μm, 5 μm to 50 μm, 50 μm to 200 μm, 50 μm to 100 μm, 100 μm to 500 μm, 100 μm to 300 μm, 100 μm to 200 μm, 80 μm to 150 μm, 20 μm to 100 μm, 25 μm to 60 μm, 40 μm to 80 μm, 80 μm to 120 μm, 90 μm to 110 μm, 5 μm to 40 μm, 5 μm to 30 μm, 5 μm to 25 μm, 5 μm to 20 μm, 5 to 15 μm, 5 to 10 μm, 10 to 30 μm, 15 to 25 μm, 20 to 30 μm, 1 to 10 μm, 2 to 10 μm, 4 to 10 μm, 5 to 10 μm, 7.5 to 10 μm, 8 to 10 μm, 0.5 to 7.5 μm, 0.5 to 5 μm, 0.5 to 3 μm, 0.5 to 2 μm, 0.5 to 1 μm, 1 to 5 μm, 1 to 2 μm, 2 to 5 μm, 2 to 3.5 μm, 4 to 8 μm, 4 to 6 μm, 5 to 8 μm, 5 to 6 μm, 5 to 6.5 to 6 μm, 9 to 9 μm or 9 to 8 μm.

Further, the ink-receiving layer may be formed with a radial meandering structure on the surface thereof to have a constant surface roughness. Specifically, the average value of the surface roughness "Rz" of the radially meandering structure present on the surface of the ink-receiving layer may be 0.5 μm to 10 μm, more specifically, the upper limit value may be 10 μm or less, 8 μm or less, 6 μm or less, 5 μm or less, 4 μm or less, 3 μm or less, or 2 μm or less, and the lower limit value may be 0.5 μm or more, 1 μm or more, 2 μm or more, 4 μm or more, 5 μm or more, or 6 μm or more. For example, the surface roughness (Rz) of the radial meandering structure may be 0.5 to 6 μm, 1 to 3 μm, 1 to 5 μm, 1 to 7 μm, 1 to 9 μm, 2 to 10 μm, 4 to 10 μm, 6 to 10 μm, 8 to 10 μm, 2 to 4 μm, 3 to 7 μm, 6 to 9 μm, 4 to 6 μm, 7 to 9 μm, 3 to 5 μm, 4 to 7 μm, 6 to 8 μm, 3 to 8 μm, 0.5 to 4 μm, 0.5 to 6 μm, 1 to 3.5 μm, 2 to 7 μm, 2.5 to 5 μm, 2.8 to 4.1 to 4.5 μm, or 1.5 μm.

Further, the radial meander structures may be formed at a certain frequency (e.g., a certain number) per unit area, and the number of radial meander structures may be the same as the number of central portions of the radial meander structures present per unit area. In addition, the radial zigzag structure can be 20-400 per unit area (1 millimeter multiplied by 1 millimeter) of the surface of the ink receiving layer, specifically, 20-350, 20-300, 20-250, 20-200, 20-150, 100-400, 100-350, 150-350, 250-350, 200-400, 30-100, 25-180, 25-150, 25-120, 40-100, 30-80, 20-50, 30-50, 40-60, 80-120, 140-180, 30-40, 105-150, 100-120, 150-160 or 70-180 per unit area (1 millimeter multiplied by 1 millimeter).

For example, the ink-receiving layer may have 80 to 120 dendrite shapes per unit area (1mm × 1mm), the dendrite shapes having an average diameter of 60 to 70 μm and a surface roughness Rz of 2 to 4.5 μm.

In the decorative material of the present invention, by including the radially meandering structure having the above-described form and frequency as the outermost layer on the surface of the ink-receiving layer, the surface area of the ink-receiving layer is increased, so that the ink absorbability and/or fixability, i.e., printability, can be improved, and the adhesion to the base material layer and the like can be optimized, whereby various physical properties of the decorative material, such as aesthetic effect and durability, can be improved.

For example, the decorating material of the present invention can optimize the surface roughness of the ink-receiving layer to increase its surface area, and unlike the ink-receiving layer formed by thermal drying and/or thermal curing, can improve its ink fixability due to surface hydrophilicity by UV curing. Specifically, the smaller and constant the size of the droplets of the ink printed on the ink-receiving layer without spreading, the more excellent the fixability, and the higher the fixability of the ink, the higher the definition of the printed grain and/or pattern. When the surface of the printed decorating material is observed under an optical microscope, the decorating material of the present invention is observed at a unit area (0.1 cm)²) The average size of the ink droplets present therein may be 50 μm or less, specifically, the unit area (0.1 cm) of the ink-receiving layer²) The average size of the ink droplets to be fixed may be 0.01 to 50 μm, 0.01 to 45 μm, 0.01 to 40 μm, 0.01 to 35 μm, 0.01 to 30 μm, 0.01 to 25 μm, 0.01 to 20 μm, 0.01 to 15 μm, 0.01 to 10 μm, 0.01 to 5 μm, 0.05 to 50 μm, 0.1 to 50 μm, 0.5 to 50 μm, 1 to 50 μm, 5 to 50 μm, 10 to 50 μm, 15 to 50 μm, 20 to 50 μm, 25 to 50 μm, 30 to 50 μm, 35 to 50 μm, 40 to 50 μm, 45 to 50 μm, 10 to 50 μm, 40 to 25 μm, 45 to 33 μm, 40 to 25 μm, or more, 35 to 44 μm, 29 to 38 μm or 35 to 38 μm.

In addition, since the size of the ink droplets is constant, the standard deviation of the size of the ink droplets may be 10 or less, specifically, 0.01 to 10, 0.05 to 10, 1 to 10, 2 to 10, 0.01 to 8, 0.01 to 6, 0.5 to 8, 1 to 8, 2 to 8, 4 to 9, 3 to 7, 4 to 6, or 4.5 to 5.5.

Further, the decorative material according to the present invention has excellent adhesion to the base material layer, and when cross-cut evaluation is performed according to JIS K5600-5-6, the area of the ink-receiving layer peeled or removed may be 20% or less of the entire area, specifically, the area of the ink layer peeled or removed may be 15% or less, 10% or less, 5% or less, 0.1 to 20%, 0.1 to 15%, 0.1 to 10%, 0.1 to 5%, or 0.1 to 2% of the entire area, and according to various cases, peeling hardly occurs, and the damaged area may approach 0%.

Meanwhile, the base material layer provided in the finishing material of the present invention is a layer serving as a base of the finishing material, supporting the ink receiving layer and the printed layer, and serves to absorb an impact transmitted from the outside. The average thickness of the substrate layer may be in the range of 100 to 1000. mu.m, specifically 100 to 500. mu.m, 100 to 300. mu.m, or 150 to 250. mu.m.

Further, the above substrate layer may include at least one selected from the group consisting of a polyvinyl chloride (PVC) substrate, a polyethylene terephthalate (PET) substrate, and a glycol-modified polyethylene terephthalate (PETG) substrate, paper, wood-based balls, inorganic-based balls, and synthetic resin-based balls.

In addition, the average thickness of the ink-receiving layer according to the present invention may be adjusted to an appropriate range to sufficiently receive the ink of the printing layer and not to affect the thickness of the entire decorating material. For example, the ink-receiving layer may have an average thickness of 10 μm or less, more specifically 0.1 μm to 10 μm, 0.1 μm to 8 μm, 0.1 μm to 6 μm, 0.1 μm to 4 μm, 0.1 μm to 2 μm, 1 μm to 10 μm, 2 μm to 10 μm, 5 μm to 10 μm, 4 μm to 8 μm, 3 μm to 6 μm, 1 μm to 4 μm, 1 μm to 3 μm, 2 μm to 4 μm, 2.5 μm to 8 μm, 0.1 μm to 3.5 μm, or 1.5 μm to 3.5 μm, so as not to be torn or lost due to external stimulus. As shown in FIG. 2, the average thickness of the ink-receiving layer referred to in the present invention may refer to the average thickness (T) of the ink-receiving layer excluding the height of dendrites_aver) And, depending on the case, may refer to the average thickness (T) of the ink layer excluding the dendrite height_aver) And 1/2 value for the average maximum height of dendrites (Rmax).

In addition, the printed layer having in the decorating material of the present invention may be formed by imparting a grain and/or a pattern by various printing methods used in the art, and the ink used may include aqueous ink and/or water-soluble ink containing water. The average thickness of the printed layer may be 0.1 to 1000. mu.m, specifically 0.1 to 500. mu.m, 0.1 to 200. mu.m, 0.1 to 100. mu.m, 0.1 to 50 μm, 0.1 to 10 μm, 0.1 to 5 μm, 0.1 to 1 μm, 0.1 to 0.5 μm, 1 to 5 μm, 5 to 20 μm, 20 to 50 μm, 40 to 60 μm, 50 to 100 μm, 200 to 400 μm, 150 to 300 μm, or 0.1 to 0.2 μm.

Further, the decorating material according to the present invention may further include a transparent layer on the printed layer. A transparent layer may be formed on the top to improve surface quality of the decorating material such as scratch resistance and abrasion resistance, and to improve stain resistance. The transparent layer may have an average thickness of 0.5mm to 5 mm. When the thickness of the transparent layer is less than 0.5mm, improvement of scratch resistance, abrasion resistance and stain resistance of the finishing material cannot be achieved. Further, when the thickness of the transparent layer is greater than 5mm, the appearance of the grain represented by the printed layer may be reduced by reflection or refraction of visible light by the transparent layer. The transparent layer may be formed of a composition including at least one selected from the group consisting of a polyethylene terephthalate (PET) film, a polybutylene terephthalate (PBT) film, a polycarbonate film, an ethylene-vinyl acetate (EVA) film, a polyethylene film, a polypropylene film, polymethyl methacrylate (PMMA), and a combination thereof.

Method for manufacturing decorative material

In one embodiment, the present disclosure also provides a method of manufacturing a trim material, comprising the steps of:

irradiating the acrylic resin composition coated on the base material layer with ultraviolet rays to form an ink-receiving layer having a dendrite shape which is a radial meandering structure having a point on a surface as a central portion and extending from the central portion to a peripheral portion; and

on the formed ink-receiving layer, a printed layer is formed with ink.

The manufacturing method of the decorating material according to the invention comprises the following steps: the method includes coating an acrylic resin composition onto a base material layer, irradiating the coated acrylic resin composition with UV to form an ink-receiving layer, and then forming a printed layer with ink on the formed ink-receiving layer.

Here, the step of forming the ink-receiving layer is performed by irradiating UV, specifically, may be performed by gradually curing the acrylic resin composition under different conditions, which includes the steps of: a first light irradiation step of irradiating light having a wavelength of 200nm or less to the acrylic resin composition coated on the base material layer under an inert gas condition to activate the composition; and a second light irradiation step of irradiating the activated composition with light having a wavelength of 200nm to 400nm under air conditions to cure the composition to form an ink-receiving layer.

At this time, the first light irradiation step is a first step of irradiating light to the acrylic resin composition coated on the base material layer, wherein the excimer generated due to the irradiated light shrinks the surface of the coated composition and/or ink-receiving layer to form wrinkles, thereby increasing the scattering rate of the incident light to the surface. The present invention can use an excimer to contract the surface of the acrylic resin composition and/or the ink-receiving layer into the above-described radial micro-tortuous structure. For this purpose, light having a high energy and a wavelength of less than 300nm, specifically, light having a wavelength of 100 to 200nm or 150 to 195nm, containing a small amount of oxygen (O)₂) Nitrogen (N) of₂) The first light irradiation step is performed in an atmosphere. Specifically, nitrogen gas (N) in the first light irradiation step₂) Oxygen (O) contained in₂) The concentration of (B) may be 10 to 3500ppm, specifically 10 to 3000ppm, 10 to 2500ppm, 1000 to 2000ppm, 2000 to 3000ppm, 3000 to 3500ppm, 1500 to 3000ppm, 10 to 2000ppm, 10 to 1000ppm, 10 to 500ppm, 100 to 300ppm, 10 to 200ppm, 50 to 150ppm, 80 to 120ppm, 700 to 2500ppm, 900 to 1500ppm, 100 to 1300ppm or 800 to 1200 ppm.

In addition, in the first light irradiation step, the distance between the composition and the light source may be 5 to 100mm, specifically, 5 to 80mm, 5 to 60mm, 5 to 40mm, 10 to 70mm, 10 to 50mm, 10 to 30mm, 20 to 80mm, 20 to 60mm, 20 to 50mm, 20 to 30mm, 25 to 75mm, 50 to 80mm, 40 to 60mm, or 45 to 55 mm.

Further, the light irradiation amount in the first light irradiation step may be 1mJ/cm²～150mJ/cm²Specifically 1mJ/cm²～130mJ/cm²、1mJ/cm²～110mJ/cm²、1mJ/cm²～80mJ/cm²、1mJ/cm²～60mJ/cm²、1mJ/cm²～40mJ/cm²、1mJ/cm²～35mJ/cm²、1mJ/cm²～30mJ/cm²、1mJ/cm²～20mJ/cm²、1mJ/cm²～10mJ/cm²、5mJ/cm²～10mJ/cm²、5mJ/cm²～15mJ/cm²、5mJ/cm²～20mJ/cm²、5mJ/cm²～25mJ/cm²、5mJ/cm²～35mJ/cm²、5mJ/cm²～50mJ/cm²、15mJ/cm²～25mJ/cm²、25mJ/cm²～35mJ/cm²、25mJ/cm²～50mJ/cm²、40mJ/cm²～60mJ/cm²、35mJ/cm²～85mJ/cm²、45mJ/cm²～75mJ/cm²、60mJ/cm²～70mJ/cm²、70mJ/cm²～100mJ/cm²、80mJ/cm²～150mJ/cm²、100mJ/cm²～150mJ/cm²、90mJ/cm²～120mJ/cm²、110mJ/cm²～130mJ/cm²Or 61mJ/cm²～72mJ/cm²。

As an example, the first light irradiation step may be performed by irradiating a solution containing 100ppm of oxygen (O)₂) Nitrogen (N) of₂) Under the condition of 62-68 mJ/cm for the composition²Irradiating light having a wavelength of 172 + -2 nm for a very short time of 1-2 seconds to form an excimer in the acrylic resin composition.

In the present invention, by controlling the gas conditions, the distance between the acrylic resin composition and the light source, and the irradiation amount in the first light irradiation step within the above ranges, the average diameter, height, and/or frequency of the random radial-shaped minute meandering structure formed on the surface of the ink receiving layer can be easily controlled.

Further, the second light irradiation step is a step of curing by applying Ultraviolet (UV) energy to the composition whose surface shrinks and/or the ink-receiving layer, and may be performed by irradiating under air conditions at a wavelength of 200 to 400nm, specifically 250 to 380nm, 280 to 380nm, 250 to 350nm, or280 to 320 nm. The second light irradiation step of the present invention uses light having a wavelength of 200nm to 400nm under air conditions, thereby increasing the curing rate of the acrylic resin composition and/or the ink-receiving layer, and also by using molecular oxygen (O)₂) To ozone (O)₃) To induce an effect of cleaning the surface of the ink-receiving layer. Here, the surface temperature of the curing composition and/or the ink-receiving layer may be 20 to 90 ℃, specifically 20 to 80 ℃ or 30 to 70 ℃.

For example, the second light irradiation step is carried out under air conditions at a concentration of 20 to 800mJ/cm for the composition and/or the ink-receiving layer²The light quantity of (a) is irradiated for a very short time of 1 to 2 seconds with light having a wavelength of 300 + -5 nm, and the distance between the acrylic resin composition and/or the ink-receiving layer and the light source may be 0.5 to 10 mm.

In the present invention, light of a desired wavelength can be irradiated at each step according to a known method. For example, light having a wavelength of 400nm or less in the UV region may be irradiated using a mercury lamp, a metal halide lamp, or the like.

Further, in the present invention, the light irradiation time may be a very short time of 1 to 2 seconds, and the light irradiation time may be controlled by the moving speed of the acrylic resin composition during the light irradiation, for example, the moving speed of the acrylic resin composition coated on the substrate. For example, the moving speed of the acrylic resin composition and/or the substrate coated with the composition may be 1 to 50m/min, specifically 5 to 40m/min, 10 to 40m/min, 20 to 40m/min, 30 to 40m/min, 15 to 25m/min, 5 to 15m/min, 15 to 20m/min, 35 to 40m/min, or 18 to 22 m/min.

Since the manufacturing method of the decorating material according to the present invention can form the ink-receiving layer by irradiating the acrylic resin composition coated on the base material layer with UV as described above, when the ink-receiving layer is formed by conventional heat drying and/or heat curing, not only the occurrence of curling can be prevented according to the heat shrinkage rate of the base material layer, but also the ink-receiving layer can be directly formed on the base material layer, which has an advantage that the process can be simplified.

As an example, the decorating material manufactured by the manufacturing method of the decorating material of the present invention may exhibit a curl of 1T or less under a temperature condition of 22 ± 2 ℃ in the structural stability evaluation, and may specifically cause a curl of 0.9T or less, 0.8T or less, 0.7T or less, 0.6T or less, 0.5T or less, and according to circumstances, may not occur, that is, exhibit a curl of 0T.

In addition, since the ink-receiving layer is formed by ultraviolet light irradiation, hydrophilic functional groups such as hydroxyl groups (OH groups) are substituted on the surface and the surface energy is increased, so that when the printed layer is formed with water-soluble ink and/or aqueous ink, the fixing force to the water-soluble ink and/or aqueous ink can be enhanced.

For example, when a hydrophilic functional group is substituted and an average static water contact angle is measured, the average static water contact angle of the ink-receiving layer according to the present invention may be 5 ° to 60 °, specifically, 5 ° to 55 °, 5 ° to 50 °, 5 ° to 45 °, 5 ° to 40 °, 5 ° to 35 °, 5 ° to 30 °, 5 ° to 25 °, 5 ° to 20 °, 5 ° to 15 °, 5 ° to 10 °, 10 ° to 60 °, 20 ° to 60 °, 30 ° to 60 °, 35 ° to 60 °, 45 ° to 60 °, 50 ° to 15 ° to 45 °, 20 ° to 40 °, 25 ° to 55 °, 35 ° to 55 °, 30 ° to 50 °, 40 ° to 50 °, 37 ° to 47 °, 42 ° to 54 °, or 42 ° to 48 °.

As another example, the ink-receiving layer has a unit area (0.1 cm) when the surface is observed by an optical microscope after being printed with the water-soluble ink and/or the water-based ink²) The average size of the fixed ink droplets is 50 μm or less, and the standard deviation of the ink droplet size is 10 μm or less.

The acrylic resin composition may include a urethane acrylic oligomer, an acrylic monomer having a hydrophilic functional group, a multifunctional acrylic monomer, and an initiator.

Specifically, the urethane acrylic oligomer is an oligomer containing an acrylic group as a polymerizable functional group and a urethane group, and has advantages that a radical polymerization reaction rapidly occurs due to an initiation reaction of a photoinitiator, a coating film excellent in elasticity and toughness is produced, and the adhesion to a base layer formed of polyvinyl chloride (PVC) or the like is excellent. Such urethane acrylate is synthesized from polyisocyanate, polyol and acrylate compound having hydroxyl group, and as the polyisocyanate, 5-isocyanate-1- (isocyanatemethyl) -1,3, 3-trimethylcyclohexane, 4-dicyclohexylmethane diisocyanate, 1, 6-diisocyanatohexane and 1, 6-diisocyanatohexane derivatives can be used as the polyol, polyester polyol, polyether polyol, polycarbonate polyol and the like can be used, and 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate and the like can be used as the acrylate compound having hydroxyl group. Further, the urethane acrylate may be a multifunctional oligomer containing two or more polymerizable functional groups, and may specifically include one or more of a bifunctional oligomer, a trifunctional oligomer, a tetrafunctional oligomer, and a hexafunctional oligomer.

In addition, the weight average molecular weight of the urethane acrylate oligomer may be 100 to 10000, more specifically 500 to 5000, 1000 to 3000 or 1500 to 2000. By adjusting the weight average molecular weight of the urethane acrylic oligomer to the above range, the durability of the finishing material can be further improved.

The acrylic monomer having a hydrophilic functional group may contain a hydroxyl group (-OH group), a carboxyl group (-COOH group), or an amine group (-NH)₂A group) and the like as a hydrophilic functional group. Specifically, the acrylic monomer having a hydrophilic functional group may include one or more selected from 2-hydroxyethyl (meth) acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyhexyl acrylate, hydroxyoctyl acrylate, one or more of hydroxyethylene glycol (meth) acrylate or hydroxypropylglycol (meth) acrylate, acrylic acid, methacrylic acid, (meth) acryloyloxy acetic acid, (meth) acryloyloxy propionic acid, (meth) acryloyloxy butyric acid, acrylic acid dimer, itaconic acid, maleic acid, and caprolactone-modified hydroxyl (CHA) acrylate. For example, the acrylic monomer having a hydrophilic functional group may include hydroxyethyl methacrylate and hydroxypropyl acrylate.

In addition, in the acrylic resin composition, the content of the acrylic monomer having a hydrophilic functional group is 30 to 90 parts by weight based on 100 parts by weight of the urethane propylene oligomer, and specifically, may be 30 to 80 parts by weight, 30 to 70 parts by weight, 30 to 60 parts by weight, 30 to 50 parts by weight, 30 to 40 parts by weight, 45 to 90 parts by weight, 50 to 90 parts by weight, 60 parts by weight, 90 parts by weight, 70 to 90 parts by weight, 80 to 90 parts by weight, 45 to 80 parts by weight, 50 to 75 parts by weight, 65 to 90 parts by weight, 60 to 80 parts by weight, 67 to 83 parts by weight, 59 to 73 parts by weight, or 68 to 72 parts by weight based on 100 parts by weight of the urethane propylene oligomer.

As an example, when the acrylic monomer having a hydrophilic functional group includes hydroxyethyl (meth) acrylate and hydroxypropyl acrylate, the content of the acrylic monomer may be 30 parts by weight and 40 parts by weight, respectively, based on 100 parts by weight of the urethane acrylic oligomer.

In addition, the multifunctional acrylic monomer is a monomer having two or more polymerizable functional groups, and examples thereof include monomers selected from the group consisting of 1, 6-hexanediol diacrylate, tetraethylene glycol diacrylate, tripropylene glycol diacrylate, triethylene glycol diacrylate, dipropylene glycol diacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, and trimethylpropane triacrylate. For example, the acrylic resin composition according to the present invention may include tetraethylene glycol diacrylate, tripropylene glycol diacrylate and trimethylolpropane triacrylate as the multifunctional acrylic monomer.

In addition, the polyfunctional acrylic monomer may be contained in an amount of 50 to 150 parts by weight based on 100 parts by weight of the urethane acrylic oligomer, and specifically, the polyfunctional acrylic monomer may be contained in an amount of 50 to 140 parts by weight, 50 to 130 parts by weight, 50 to 120 parts by weight, 50 to 110 parts by weight, 50 to 100 parts by weight, 50 to 90 parts by weight, 50 to 80 parts by weight, 75 to 150 parts by weight, 90 to 150 parts by weight, 100 to 150 parts by weight, 120 to 150 parts by weight, 130 to 150 parts by weight based on 100 parts by weight of the urethane acrylic oligomer in the acrylic resin composition, 75 to 95 parts by weight, 90 to 105 parts by weight, 105 to 120 parts by weight, 115 to 130 parts by weight, 120 to 140 parts by weight, 135 to 150 parts by weight, 70 to 110 parts by weight, 85 to 120 parts by weight, 80 to 100 parts by weight, 90 to 100 parts by weight, 92 to 98 parts by weight, 81 to 98 parts by weight or 92 to 109 parts by weight.

For example, when the acrylic monomer having a multifunctional acrylic function includes tetraethylene glycol diacrylate, tripropylene glycol diacrylate and trimethylolpropane triacrylate as the multifunctional acrylic monomer, the contents thereof may be 40 parts by weight, 40 parts by weight and 10 parts by weight, respectively, based on 100 parts by weight of the urethane acrylic oligomer.

In addition, the acrylic resin composition of the present invention may further comprise a filler having high hardness so as to serve as a dendritic seed formed on the surface of the ink-receiving layer and improve the durability of the decorating material. For example, as the filler, a filler which does not affect the fixing force with the ink droplets and/or the adhesion to the base material layer after the acrylic resin composition is cured and which improves the surface hardness can be used. Specifically, colloidal silica, alumina, glass beads, organic beads (polymer particles and the like), and the like can be used as the filler, and the average particle diameter thereof can be 1 μm to 10 μm or 3 μm to 7 μm.

Further, the content of the above filler may be 15 parts by weight or less based on 100 parts by weight of the composition so as not to inhibit printability of the ink receiving layer and adhesion to the base material layer. For example, the filler may be contained in an amount of 12 parts by weight or less based on 100 parts by weight of the composition, more specifically, the upper limit of the content of the filler may be 12 parts by weight or less, 11 parts by weight or less, 10 parts by weight or less, 8 parts by weight or less, 6 parts by weight or less, or 5 parts by weight or less, and the lower limit may be 0.01 parts by weight or more, 0.05 parts by weight or more, 0.1 parts by weight or more, 0.5 parts by weight or more, or 1 part by weight or more. For example, the filler may comprise 0.1 to 15 parts by weight, 0.1 to 14 parts by weight, 0.1 to 13 parts by weight, 0.1 to 12 parts by weight, 0.5 to 11 parts by weight, 1 to 5 parts by weight, 3 to 7 parts by weight, 5 to 12 parts by weight, 7 to 14 parts by weight, 3 to 11 parts by weight, 6 to 12 parts by weight, 9 to 14 parts by weight, 8 to 12 parts by weight, or 9 to 11 parts by weight.

In the present invention, by controlling the average particle diameter and the content of the filler within the above ranges, it is possible to prevent an increase in viscosity and a decrease in workability due to an excessive amount of the filler in the acrylic resin composition. Further, it is possible to prevent the occurrence of cracks in the ink-receiving layer and increase the adhesion between the ink-receiving layer and other layers to improve durability.

The acrylic resin composition used in the present invention may contain no solvent, and even if it does not contain a solvent, the composition has a low viscosity, and therefore, the acrylic resin composition has excellent workability in forming an ink-receiving layer. Specifically, the viscosity of the acrylic resin composition may be 500cps or less, specifically, 400cps or less, 300cps or less, 250cps or less, 200cps or less, 100 to 500cps, 100 to 400cps, 100 to 300cps, 100 to 250cps, 100 to 400cps, 150 to 350cps, 200 to 350cps, 250 to 350cps, or 280 to 300cps at 25 ℃, and may exhibit a viscosity of 500cps or less even including some filler in order to improve the durability of the ink receiving layer. The acrylic resin composition of the present invention has a low viscosity of 500cps or less, and thus is easy to work without mixing a solvent, and thus has an advantage of being environmentally friendly.

Further, the method of coating the acrylic resin composition on the substrate may be performed by a method known in the art, for example, using a Mayer bar, a D-bar, a rubber roller, a G/V roller, an air knife, a slot die, or the like.

Further, in the manufacturing method of the decorating material according to the present invention, the step of forming the printed layer is a step of printing the printed layer on the ink-receiving layer using water-soluble ink and/or water-based ink commonly used in the art, and may be performed by inkjet printing, gravure printing, screen printing, offset printing, rotary printing, flexo printing, or a printing method combining them.

In this case, since the ink-receiving layer has excellent ink fixing ability, high-speed single-pass printing which is applied to printing processing in smart factories can be performed, and the printing step can be performed at a printing speed of 50m/min to 150 m/min. Specifically, the concentration of the water can be controlled at 50-140 m/min, 50-120 m/min, 50-110 m/min, 50-100 m/min, 50-80 m/min, 50-60 m/min, 70-150 m/min, 90-150 m/min, printing at a printing speed of 110 m/min-150 m/min, 130 m/min-150 m/min, 70 m/min-130 m/min, 90 m/min-110 m/min, 80 m/min-100 m/min, 110 m/min-140 m/min, 90 m/min-130 m/min, 65 m/min-85 m/min or 95 m/min-125 m/min.

In addition, the manufacturing method of the decorating material of the present invention may further include a step of forming a transparent layer on the printing layer after the step of forming the printing layer. The transparent layer may improve the surface quality of the finishing material, such as scratch resistance and abrasion resistance, and may impart an effect of improving stain resistance to the finishing material. The transparent layer may be formed on the printing layer by thermal lamination performed at a temperature range of 100 to 200 ℃, but is not limited thereto.

Detailed description of the preferred embodiments

Hereinafter, the present invention will be described in more detail with reference to examples and experimental examples.

However, the following examples and experimental examples are merely illustrative of the present invention, and the contents of the present invention are not limited to the following examples and experimental examples.

Example 1

100 parts by weight of a urethane methacrylic oligomer (molecular weight: 2200), 30 parts by weight of hydroxypropyl acrylate, 30 parts by weight of hydroxyethyl acrylate, 40 parts by weight of tripropylene glycol diacrylate, 40 parts by weight of tetraethylene glycol diacrylate and 10 parts by weight of trimethylpropane triacrylate were mixed, and 7 parts by weight of Irgacure-184(IRG-184) was added as a photoinitiator. Then, 10 parts by weight of silica having an average size of 5. + -. 0.5. mu.m was mixed to obtain an acrylic resin composition.

A substrate layer, which is a calendered white sheet formed of polyvinyl chloride (PVC) and having an average thickness of 0.2mm, was prepared, and the acrylic resin composition prepared above was coated in a thickness of 3 μm on the upper portion of the sheet. Then, oxygen (O) was added in an amount of 1000ppm₂) Nitrogen (N) of gas₂) Under the condition of atmosphere,at a distance of 50 + -1 cm from the composition, and at a distance of 65 + -1 mJ/cm for the composition²The light quantity of (2) is 172. + -. 0.5nm (first light is irradiated). Then, under air conditions, at a distance of 100. + -.1 cm from the composition, for the composition irradiated with the first light, at 1200mJ/cm²Is irradiated with light of 300 + -1 nm (irradiated with second light) to form an ink-receiving layer having an average thickness of 3 μm. On the ink-receiving layer, a printed layer (average thickness: 1 μm) was formed by ink-jet printing using four water-soluble inks showing black, red, blue, yellow and green.

Example 2

A decorating material was produced in the same manner as in example 1, except that, on the printed layer, a polyethylene terephthalate film (average thickness: 30 μm) was thermally laminated at 150 ± 2 ℃ to form a transparent layer.

Comparative example 1

A printing layer is formed on a plain printing paper by an ink-jet printing method using a water-soluble ink.

Comparative example 2

A base material layer, which is a calendered white sheet formed of polyvinyl chloride (PVC) and having an average thickness of 0.2mm, was prepared, and a printed layer was formed on the prepared base material layer using a water-soluble ink in an inkjet printing method, thereby preparing a finishing material.

Comparative example 3

A substrate layer, which is a white sheet formed of polyvinyl chloride (PVC) and subjected to a calendering process with an average thickness of 0.2mm, was prepared, and, on the upper portion of the sheet, the acrylic resin composition prepared in example 1 was coated at a thickness of 3 μm. Then, under air conditions, at a distance of 100. + -.1 cm from the composition, for the acrylic resin composition to be coated, at 1200mJ/cm²Is irradiated with light of 300. + -.1 nm to form an ink-receiving layer having an average thickness of 3 μm. A printed layer (average thickness: 1 μm) was formed on the ink-receiving layer by ink-jet printing using a water-soluble ink, thereby preparing a decorating material.

Comparative example 4

By comparison with example 1The decorating material was prepared in the same manner except that 4000ppm of oxygen (O) was contained when the first light was irradiated₂) Nitrogen (N) of gas₂) At a distance of 50 + -1 cm from the composition, under an atmosphere, of 45 + -1 mJ/cm for the composition²The light quantity of (1) irradiates light (irradiates first light).

Experimental example 1

Scanning Electron Microscope (SEM) analysis was performed on the decorating materials prepared in example 1 and comparative examples 3 and 4 to confirm the surface structure of the ink-receiving layer of the decorating material according to the present invention, and the results are shown in fig. 2 to 4.

Referring to fig. 2 and 3, it can be seen that the finishing material according to example 1 of the present invention includes a radial zigzag structure having a certain size and frequency on the surface, and the structure has a height decreasing from the central portion to the peripheral portion. Further, when the decorating material of example 1 was examined, it was found that the average size of the radial zigzag structure was 50. + -.2 μm, the height of the center portion was 4. + -.1 μm, and 140 to 165 dendrite shapes were included per unit area (1 mm. times.1 mm).

In contrast, it was found that the ink-receiving layer of the decorative material of comparative example 3, to which the first light irradiation step was not applied, had no fine meandering structure on the surface. Further, referring to fig. 4, it was confirmed that although the first light irradiation step was performed, nitrogen (N) was present at the time of the first light irradiation₂) Oxygen (O) in gas₂) The concentration of the gas was remarkably increased, and the finishing material of comparative example 4 having a low light amount included a zigzag structure at the surface but since dendrites have irregular sizes, ink was accumulated between the fine zigzag structures, thereby diffusing the ink.

From these results, it can be seen that the first light irradiation step of irradiating light having a wavelength of less than 200nm generates an excimer, and the generated excimer generates a short-wavelength ultraviolet ray to rapidly promote surface curing of the composition and/or the ink-receiving layer, whereby shrinkage occurs on the surface of the composition and/or the ink-receiving layer to form a dendritic micro-tortuous structure. Further, it can be seen that the shape and frequency of the minute meandering structure can be controlled by adjusting the conditions under which the first light irradiation step is performed, particularly the gas conditions, to specific conditions.

Experimental example 2

The following experiments were performed on the decorating materials prepared in examples 1 and 2 and comparative examples 1 to 4 to evaluate printability, printing definition, adhesion to a substrate layer, and curling degree of the decorating material according to the present invention, and the results are shown in the following table 1 and fig. 5 and 6.

1) Surface roughness evaluation

As shown in examples 1 and 2 and comparative examples 2 to 4, test pieces were prepared by respectively forming ink-receiving layers on white sheets composed of polyvinyl chloride (PVC), and general printing papers of comparative example 1 were separately prepared, and then a sample having an ink-receiving layer formed thereon in surface roughness (Rz) of each test piece and the general printing papers were measured according to ISO 4287 standards.

2) Evaluation of print clearness

The decorative material was placed in a bright place under a fluorescent lamp at a distance of 30 cm from the observer's eyes, and the sharpness of the printed pattern was visually evaluated. At this time, the evaluation criteria are as follows:

o: the area of the ink unfixed area or margin is 5% or less with respect to the total area (100%) of the printed pattern;

Δ: the area of the ink unfixed area or margin is more than 5% and 20% or less with respect to the total area (100%) of the printed pattern;

x: the area of the ink unfixed areas or spaces is greater than 20% relative to the total area of the printed pattern (100%).

3) Evaluation of printability

The surface of the decorative material was observed with an optical microscope, and the unit area (0.1 cm)²) The size of the ink droplets present in the ink and the mean and standard deviation of the measured sizes are derived.

4) Static Water contact Angle evaluation

Static water contact angle (Static WCA) was measured using a contact angle meter (model: SmartDrop, manufactured by Femtofab, Inc.). At this time, measurement was performed by dropping a drop of 10. mu.L of distilled water on the surface at each measurement, and repeated three times to derive an average value thereof.

5) Evaluation of substrate layer adhesion

Six lines were cut in the horizontal and vertical directions in accordance with JIS K5600-5-6, respectively, and after a prescribed adhesive tape (JIS Z1522) was attached to the surface, one side of the tape was pulled off with a force at an angle of 90 degrees, and the peeled surface was visually observed to evaluate the adhesion to the base layer. The evaluation criteria are as follows:

o: the area damaged by peeling or partial peeling is 5% or less with respect to the entire crosscut region (100%);

Δ: an area damaged by peeling or partial peeling is 5% or more and less than 15% with respect to the entire traverse area (100%);

x: the damaged area by peeling or partial peeling was 15% or more with respect to the entire traverse area (100%).

TABLE 1

As can be seen from table 1 and fig. 5 and 6, the decorating material according to the present invention has an ink-receiving layer between the base material layer and the printed layer, the ink-receiving layer having a dendritic fine zigzag structure on the surface, and thus is excellent in printability and definition, and is excellent in adhesion to the base material layer.

Specifically, referring to Table 1, it was found that the decorating materials of examples 1 and 2 comprise an ink-receiving layer having a dendritic micro-tortuous structure on the surface thereof, and have an average surface roughness (Rz) of 3 to 8 μm and a static water contact angle of 40 to 50 °. This means that, when the ink-receiving layer is formed, a dendritic fine meandering structure is induced on the surface of the ink-receiving layer by irradiating light having different wavelength conditions in a stepwise manner to achieve a specific range of surface roughness while increasing the surface energy and substituting the hydrophilic functional group to reduce the static water contact angle.

Further, the decorating materials of examples 1 and 2 had an average droplet size of 32 to 38 μm and a standard deviation of 4 to 6, while the decorating materials of comparative examples 1 to 4 had an average droplet size of 50 μm and a standard deviation of 10 or more due to no spreading or uneven distribution of ink droplets, and the difference in printing definition thereof is clearly shown in FIG. 6.

From these results, it can be seen that when the short wavelength photo-curable composition is irradiated stepwise in a specific range under different conditions, the average size of the dendrite-shaped radial zigzag structure formed on the surface of the ink-receiving layer, the height of the central portion, the frequency of the unit area, and the like are controlled to adjust the physical properties of the decorating material, such as the print definition, the adhesion to the base material layer, and the like.

Reference numerals

Light irradiation chamber

111: first light irradiator (ultraviolet irradiator)

112: second light irradiator (ultraviolet irradiator)

120: irradiating light

130: conveying belt

140: air film

150: test specimen

200: cross-sectional structure of decorative material before printing layer is formed

210: ink receiving layer

220: substrate layer

211: dendritic crystal

Industrial applicability

The decorating material of the present invention comprises an ink-receiving layer having a dendritic-shaped radial micro-tortuous structure, thereby improving the absorption and/or fixation (i.e., printability) of ink printed on the ink-receiving layer, and is excellent in definition and therefore excellent in aesthetic effect, and can be effectively used as a decorating material.