阅读说明：本技术 一种具有光学结构的影木效果热转印膜及其制备方法 (Shadow-wood effect heat transfer film with optical structure and preparation method thereof ) 是由 肖俊凌 于 2021-11-04 设计创作，主要内容包括：本发明提供一种具有光学结构的影木效果热转印膜及其制备方法,包括：通过取影技术制得影木光学辊A和影木光学辊B,二者可套花；提供底膜,对底膜涂布结构胶A,利用影木光学辊A使结构胶A产生影纹,形成光学结构层A；在光学结构层A依次叠设复合光反离型层和印刷色层,再在印刷色层涂布结构胶B,利用影木光学辊B使得结构胶B产生影纹,形成光学结构层B；在光学结构层B涂装或复合形成光反层；在光反层远离光学结构层B的一侧印刷盖底色层,并在盖底色层涂布胶粘剂层,最后收卷得到影木效果热转印膜。与相关技术相比,本发明的具有光学结构的影木效果热转印膜的制备方法及制备的影木效果热转印膜木纹明显带动感、逼真度高且环保。(The invention provides a shadow-wood effect heat transfer film with an optical structure and a preparation method thereof, wherein the preparation method comprises the following steps: preparing a shadow wood optical roller A and a shadow wood optical roller B by a shadow taking technology, wherein the shadow wood optical roller A and the shadow wood optical roller B can be patterned; providing a bottom film, coating a structural adhesive A on the bottom film, and enabling the structural adhesive A to generate shading by using a shading optical roller A to form an optical structure layer A; sequentially stacking a composite light reverse release layer and a printing color layer on the optical structure layer A, coating a structural adhesive B on the printing color layer, and enabling the structural adhesive B to generate shading by using a shadow optical roller B to form an optical structure layer B; coating or compounding the optical structure layer B to form a light reflecting layer; and printing a cover bottom color layer on one side of the light reflection layer, which is far away from the optical structure layer B, coating an adhesive layer on the cover bottom color layer, and finally rolling to obtain the shadow wood effect heat transfer film. Compared with the prior art, the preparation method of the shadow effect heat transfer film with the optical structure and the prepared shadow effect heat transfer film have the advantages of obvious wood grain dynamic, high fidelity and environmental protection.)

1. A preparation method of a shadow-wood effect heat transfer film with an optical structure is characterized by comprising the following steps:

step S1, preparing two shadow wood optical rollers by a shadow taking technology, wherein the two shadow wood optical rollers comprise a shadow wood optical roller A and a shadow wood optical roller B, and the shadow wood optical roller A and the shadow wood optical roller B can be patterned in a sleeving manner;

step S2, providing a bottom film, coating a structural adhesive A on the bottom film, and enabling the structural adhesive A to generate shading by using the optical roller A through mould pressing or printing to form an optical structure layer A;

step S3, sequentially stacking a composite light reflecting release layer and a printing color layer on one side of the optical structure layer A, which is far away from the bottom film, coating a structure adhesive B on one side of the printing color layer, which is far away from the light reflecting release layer, and enabling the structure adhesive B to generate a shading pattern by utilizing the optical roller B through mould pressing or printing to form the optical structure layer B;

step S4, coating or compounding the optical structure layer B on the side far away from the printing color layer to form a light reflecting layer;

and step S5, printing a cover bottom color layer on the side of the optical reflection layer far away from the optical structure layer B, coating an adhesive layer on the side of the cover bottom color layer far away from the optical reflection layer, and finally rolling to obtain the shadow wood effect heat transfer film.

2. The method for preparing the shadow-wood effect heat transfer film with the optical structure according to claim 1, wherein the manufacturing of the shadow-wood optical roller specifically comprises the processes of shadow-taking, algorithm, carving and surface treatment;

the shadow taking comprises any one of direct wood grain complex grain shadow taking, laser beam shadow taking, image shadow taking, physical contact shadow taking and light scanning shadow taking;

the algorithm is to generate a dxf or dwg format file by utilizing a preset algorithm operation after the file is obtained through the image taking procedure;

and the engraving is to engrave the steel roller or the copper-plated steel roller according to the format file.

3. The method of claim 1, wherein when the optical structure layer a and the optical structure layer B are both formed by a molding press, the molding press is a separate thermoforming molding press or a UV molding press; the thickness of the optical structure layer A is 5-50 mu m, and the thickness of the optical structure layer B is 5-50 mu m.

4. The method as claimed in claim 3, wherein the optical structure layer A and the optical structure layer B are both UV-pressed by a UV press, and then 600mw/cm²And respectively obtaining the optical structure layer A and the optical structure layer B after curing by an ultraviolet mercury lamp.

5. The method for preparing a shadow effect heat transfer film having an optical structure according to claim 1, wherein,

the structural adhesive A is a high solid content adhesive and comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 1-20% of a curing agent 3390; s37 release type slipping agent, 1-5%; 20-60% of an ester ketone mixed solvent; the structural adhesive B is a high solid content adhesive and comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 1-20% of a curing agent 3390; 20-60% of an ester ketone mixed solvent; alternatively, the first and second electrodes may be,

the structural adhesive A is UV adhesive and comprises the following components in percentage by mass: 30-40% of aliphatic polyurethane acrylate UV resin; 10-20% of acrylated acrylate UV resin; 1-5% of a photoinitiator; s37, 1-5% of a release slipping agent; 10-50% of monomer UV diluent; the structural adhesive B is UV adhesive and comprises the following components in percentage by mass: 30-40% of aliphatic polyurethane acrylate UV resin; 10-20% of acrylated acrylate UV resin; 1-5% of a photoinitiator; 10-50% of monomer UV diluent; alternatively, the first and second electrodes may be,

the structural adhesive A is water-based adhesive and comprises the following components in percentage by mass: 50-80% of emulsion; 1-5% of a water-based curing agent; s37 release type slipping agent, 1-5%; 10-50% of monomer UV diluent; the structural adhesive B is water-based adhesive and comprises the following components in percentage by mass: 50-80% of emulsion; 1-5% of a water-based curing agent; 10-50% of monomer UV diluent.

6. The method for preparing a shadow-wood effect heat transfer film with an optical structure according to claim 1, wherein the light reflecting release layer is made of a UV coating and comprises the following components in percentage by mass: 30-40% of aliphatic polyurethane acrylate UV resin; 10-20% of acrylated acrylate UV resin; TPO photoinitiator, 1-5%; 10-50% of monomer UV diluent; BH114 pearlescent pigment 5%; the thickness of the light reflection release layer is 5-50 mu m.

7. The method for preparing a shadow wood effect heat transfer film with an optical structure according to claim 1, wherein the printing color layer is used for providing a wood grain color, and the printing color layer comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 10-25% of a pigment; 20-60% of an ester ketone mixed solvent; wetting dispersant pigment wetting agent, 1%; the printing color layer is printed by gravure, the plate making of gravure is 60-120 lines/cm, the depth of plate making of printing is 45 mu m, the printing color layer is composed of a plurality of printing colors, and the thickness of the coating is 5-20 mu m.

8. The method for preparing a shadow-wood effect heat transfer film with an optical structure as claimed in claim 1, wherein the light reflecting layer is made of oil paint and is formed by coating in a gravure coating manner by using a 50 line/cm anilox roller, the thickness of the light reflecting layer is 5-50 μm, and the light reflecting layer comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 1-20% of a curing agent 3390; 20-60% of an ester ketone mixed solvent; BH114 nacreous pigment, 5%.

9. The method for preparing a shadow wood effect heat transfer film with an optical structure according to claim 1, wherein the cover and background color layer is used for covering a cover and a background, and the cover and background color layer comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 25-35% of titanium dioxide; 20-60% of an ester ketone mixed solvent; wetting dispersant pigment wetting agent, 1%; the cover and bottom color layer is printed by gravure, the plate making by gravure is 60-70 lines/cm, the depth of the plate making by gravure is 45 mu m, and the thickness of the coating is 5-20 mu m.

10. The method for preparing a shadow-wood effect heat transfer film with an optical structure as claimed in claim 1, wherein the adhesive layer is made of polyurethane hot melt adhesive, the adhesive layer is printed by gravure, the gravure plate making is 60-120 lines/cm, the printing plate making depth is 45 μm, and the coating thickness is 5-20 μm.

11. A shadow wood transfer film with an optical structure is characterized by comprising a base film, an optical structure layer A, a light reflecting release layer, a printing color layer, an optical structure layer B, a light reflecting layer, a cover base color layer and an adhesive layer which are sequentially laminated, wherein the shadow wood transfer film with the optical structure is prepared by the preparation method of the shadow wood effect heat transfer film with the optical structure according to any one of claims 1 to 10.

Technical Field

The invention relates to the technical field of heat transfer films, in particular to a shadow-wood effect heat transfer film with an optical structure and a preparation method thereof.

Background

Rare wood has abundant patterns, but is a depleted resource, so that a heat transfer film which is more weather-resistant and durable and has patterns needs to be provided to meet the requirements of people. With the popularization of the application of the wood-like materials and the aesthetic pursuit of people on precious wood, people hope that the wood-like materials are closer to natural luster, the shadow patterns are vivid and weather-proof and durable, and particularly, the luster of the shadow patterns is more prominent, so that the wood-like materials are a favorite choice of people. The shadow wood has luster, the radial panel has deep and shallow banded patterns and variable banded luster, has golden wires and tiger skin patterns like golden silk nanmu, presents the colors of the traditional landscape painting and ink-wash painting of China, and has stronger vertical grain stereoscopic impression.

In the related art, the thermal transfer paper or film prepared by the method for preparing the thermal transfer paper or film with the relief wood grain in the patent number ZL 201810716300.8 has very good hand feeling, but the relief grain only achieves the relief effect, and the high-order requirements are required to be improved in many aspects. The partial matte transfer film with the notice number CN105882189B and the transfer film with the concave-convex effect and the preparation method thereof with the notice number CN105620071B can only solve the shadow effect in some visual angles, have larger difference with the color, shadow and grain nesting of real shadow wood, such as precious golden silk nanmu, which is not a simple floating grain, but an optical concave-convex grain of the whole surface. In addition, in the prior art, if the transfer film is coated with a layer of gloss oil, the concave-convex texture generated before the removal of the gloss oil can appear.

Therefore, there is a need to provide a new shadow-wood effect thermal transfer film with an optical structure and a method for preparing the same to solve the above problems.

Disclosure of Invention

The invention aims to provide a shadow-wood effect heat transfer film with an optical structure, which has obvious wood grain dynamic sense, high fidelity and environmental protection, and a preparation method thereof.

In order to solve the technical problems, the invention provides a preparation method of a shadow-wood effect heat transfer film with an optical structure, which is used for finishing the coating of the patterns, shadows, colors, release, light reflection and adhesive coatings of a film material on a production machine shaft so as to ensure that the patterns, the shadows and the patterns can be effectively aligned, and comprises the following steps:

and step S1, manufacturing two shadow wood optical rollers by a shadow taking technology, wherein the two shadow wood optical rollers comprise a shadow wood optical roller A and a shadow wood optical roller B, and the shadow wood optical roller A and the shadow wood optical roller B can be patterned in a sleeving manner.

Step S2, providing a bottom film, coating a structural adhesive A on the bottom film, and enabling the structural adhesive A to generate shading by using the optical roller A through mould pressing or printing to form an optical structure layer A.

And step S3, sequentially overlapping a composite light reflection release layer and a printing color layer on one side of the optical structure layer A far away from the base film, coating a structure adhesive B on one side of the printing color layer far away from the light reflection release layer, and enabling the structure adhesive B to generate the moire by utilizing the optical roller B through mould pressing or printing to form the optical structure layer B.

And step S4, coating or compounding the optical structure layer B on the side far away from the printing color layer to form a light reflecting layer.

And step S5, printing a cover bottom color layer on the side of the optical reflection layer far away from the optical structure layer B, coating an adhesive layer on the side of the cover bottom color layer far away from the optical reflection layer, and finally rolling to obtain the shadow wood effect heat transfer film.

Preferably, the manufacturing of the shadow wood optical roller specifically comprises the working procedures of shadow taking, algorithm, carving and surface treatment;

the shadow taking comprises any one of direct wood grain complex grain shadow taking, laser beam shadow taking, image shadow taking, physical contact shadow taking and light scanning shadow taking;

the algorithm is to generate a dxf or dwg format file by utilizing a preset algorithm operation after the file is obtained through the image taking procedure;

and the engraving is to engrave the steel roller or the copper-plated steel roller according to the format file.

Preferably, when the optical structure layer a and the optical structure layer B are both manufactured by using the same molding press in a mold pressing manner, the molding press is a separate thermoforming molding press or a UV molding press; the thickness of the optical structure layer A is 5-50 mu m, and the thickness of the optical structure layer B is 5-50 mu m.

Preferably, the optical structure layer A and the optical structure layer B are both pressed by a UV pressing machine in a UV pressing manner and then are pressed by 600mw/cm²And respectively obtaining the optical structure layer A and the optical structure layer B after curing by an ultraviolet mercury lamp.

Preferably, the structural adhesive A is a high solid content adhesive which comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 1-20% of a curing agent 3390; s37 release type slipping agent, 1-5%; 20-60% of an ester ketone mixed solvent; the structural adhesive B is a high solid content adhesive and comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 1-20% of a curing agent 3390; 20-60% of an ester ketone mixed solvent; alternatively, the first and second electrodes may be,

the structural adhesive A is UV adhesive and comprises the following components in percentage by mass: 30-40% of aliphatic polyurethane acrylate UV resin; 10-20% of acrylated acrylate UV resin; 1-5% of a photoinitiator; s37, 1-5% of a release slipping agent; 10-50% of monomer UV diluent; the structural adhesive B is UV adhesive and comprises the following components in percentage by mass: 30-40% of aliphatic polyurethane acrylate UV resin; 10-20% of acrylated acrylate UV resin; 1-5% of a photoinitiator; 10-50% of monomer UV diluent; alternatively, the first and second electrodes may be,

the structural adhesive A is water-based adhesive and comprises the following components in percentage by mass: 50-80% of emulsion; 1-5% of a water-based curing agent; s37 release type slipping agent, 1-5%; 10-50% of monomer UV diluent; the structural adhesive B is water-based adhesive and comprises the following components in percentage by mass: 50-80% of emulsion; 1-5% of a water-based curing agent; 10-50% of monomer UV diluent.

Preferably, the light reflecting release layer is made of a UV coating and consists of the following components in percentage by mass: 30-40% of aliphatic polyurethane acrylate UV resin; 10-20% of acrylated acrylate UV resin; TPO photoinitiator, 1-5%; 10-50% of monomer UV diluent; BH114 pearlescent pigment 5%; the thickness of the light reflection release layer is 5-50 mu m.

Preferably, the printing color layer is used for providing a wood grain color, and the printing color layer comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 10-25% of a pigment; 20-60% of an ester ketone mixed solvent; wetting dispersant pigment wetting agent, 1%; the printing color layer is printed by gravure, the plate making of gravure is 60-120 lines/cm, the depth of plate making of printing is 45 mu m, the printing color layer is composed of a plurality of printing colors, and the thickness of the coating is 5-20 mu m.

Preferably, the light reflecting layer is made of an oil paint and is formed by coating in a 50-line/cm anilox roll gravure coating mode, the thickness of the light reflecting layer is 5-50 μm, and the light reflecting layer comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 1-20% of a curing agent 3390; 20-60% of an ester ketone mixed solvent; BH114 nacreous pigment, 5%.

Preferably, the cover bottom color layer is used for covering the cover bottom, and the cover bottom color layer comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 25-35% of titanium dioxide; 20-60% of an ester ketone mixed solvent; wetting dispersant pigment wetting agent, 1%; the cover bottom color layer is printed by gravure, the gravure plate making is 60-70 lines/cm, the printing plate making depth is 45 mu m, and the coating thickness is 5-20 mu m.

Preferably, the adhesive layer is made of polyurethane hot melt adhesive, the adhesive layer is printed by gravure, the gravure plate making is 60-120 lines/cm, the printing plate making depth is 45 mu m, and the thickness of the coating is 5-20 mu m.

The invention also provides a shadow wood effect heat transfer film with an optical structure, which comprises a bottom film, an optical structure layer A, a light reflecting release layer, a printing color layer, an optical structure layer B, a light reflecting layer, a bottom covering color layer and an adhesive layer which are sequentially laminated, wherein the shadow wood transfer film with the optical structure is prepared by the preparation method of the shadow wood effect heat transfer film with the optical structure.

Compared with the prior art, the method for preparing the shadow wood effect heat transfer film with the optical structure and the shadow wood transfer film prepared by the method can transfer the texture and the color of the shadow wood to a workpiece only by a hot pressing mode, the workpiece can achieve an ideal attachment effect after the basement film is torn off, the shadow wood texture is clear and accurate, and the layers are obvious; after the innovative post-curing coating is inserted and the finished product is transferred, the UV lamp is irradiated, so that the surface hardness of the workpiece can be greatly improved. The shadow wood transfer film prepared by the method has obvious dynamic film shadow wood grains, obvious hand feeling grains, high apparent simulation degree, excellent processing performance, capability of reducing consumption of wood resources and good environmental protection effect.

Drawings

FIG. 1 is a block flow diagram of a method for manufacturing a shadow-wood effect thermal transfer film with an optical structure according to the present invention;

FIG. 2 is a schematic structural diagram of a shadow-wood effect thermal transfer film with an optical structure according to the present invention;

fig. 3 is a schematic diagram of an effect structure of the thermal transfer film with optical structure after transfer printing.

Detailed Description

The invention will be further explained with reference to the drawings and the embodiments.

Referring to fig. 1, the invention provides a method for preparing a shadow-wood effect heat transfer film with an optical structure, which comprises a base film, an optical structure layer a, a light reflecting release layer, a printing color layer, an optical structure layer B, a light reflecting layer, a cover bottom color layer and an adhesive layer, which are sequentially laminated. As shown in fig. 2, the method comprises the steps of:

and step S1, manufacturing two shadow wood optical rollers by a shadow taking technology, wherein the two shadow wood optical rollers comprise a shadow wood optical roller A and a shadow wood optical roller B, and the shadow wood optical roller A and the shadow wood optical roller B can be patterned in a sleeving manner.

In the step, the manufacturing of the shadow wood optical roller specifically comprises the procedures of shadow taking, algorithm, carving and surface treatment.

The shadow taking technology refers to a technology for taking shadows of real wood, shadow wood series wood comprises maple shadows, golden silk nanmu, sapelli and the like, all of which have one characteristic and have obvious shadow stripes, and the definition of shadow wood is as follows: the gloss was observed to be sloshing according to the wood grain depending on the angle of the observer. It has been found that this shine is actually a reflection effect caused by the arrangement of cells in the wood, such as the chips planed from maple wood, which are typically 0.3-5mm thick, and because of the evaporation of moisture, the planed chips shrink along some grains, forming waves, and cooperate with the shine of the cellular fluids, cell walls, and fibers in the wood, thereby forming the patterns. For example, when the plane is transversely cut, the golden silk phoebe does not shrink to form a wave shape, but the golden silk phoebe forms microscopic wave fluctuation along with the growth of cells. If the texture parameters are obtained by using the tool, the related texture and shadow can be obtained, and the technology is the shadow taking technology.

The image taking comprises any one of direct wood grain complex grain image taking, laser beam image taking, physical contact image taking and light scanning image taking. In the present embodiment, laser beam projection is preferable after the experiment, but of course, other projection methods as described above are also possible.

The laser beam imaging is that a laser beam is erected on a very stable platform, the laser beam is shot to a target imaging veneer by taking the diameter of <5 mu m as one step, the distance is determined by calculating the time after reflection, and the imaging is successfully carried out by utilizing the principle that a plurality of points form a line and the line forms a surface. For example, a BMR2000 laser scanner produced by the intelligent technology ltd of pt mince, mountain, may be selected to obtain a texture map of 2000 ten thousand pixels, and a three-dimensional map may be finally constructed.

And the algorithm is to generate a dxf or dwg format file by utilizing a preset algorithm operation after the file is obtained through the image taking procedure.

And the engraving is to engrave the steel roller or the copper-plated steel roller according to the format file.

For example, the laser engraving or the direct engraving is used for engraving the steel roller or the copper-plated steel roller, and finally the surface treatment is carried out on the roller to obtain the shadow wood optical roller A and the shadow wood optical roller B.

Step S2, providing a bottom film, coating a structural adhesive A on the bottom film, and enabling the structural adhesive A to generate shading by using the optical roller A through mould pressing or printing to form an optical structure layer A.

The bottom film provides a base for printing materials, all materials are printed on the bottom film, the bottom film can be any film capable of printing a coating, such as PET, CPP, OPP, PC and the like, the thickness of the bottom film is 12-100 mu m, and the surface of the bottom film has good adhesion to the coating. In this embodiment, PET is used specifically, and preferably DuPont 30 μm PET is used, and the surface tension thereof is 52 dyne.

When the film is prepared, firstly, a structural adhesive A is coated on a bottom film, the structural adhesive is subjected to shading by a mould pressing or printing method to form an optical structure layer A, the optical structure layer A is subjected to mould pressing or printing forming on the structural adhesive A by an optical structure roller A to form shading, wherein the mould pressing is used for producing the texture on the coating on the film material, and the printing forming is used for directly coating the optical structure roller on the wood optical roller A, scraping off excessive coating by a scraper, and then transferring the coating onto the film to form the shading.

The molding is generally carried out by using a molding press which is divided into a thermoforming molding and a UV molding module, wherein the UV molding module is preferably used in the embodiment, the UV molding module is used for coating structural adhesive A on a film material, molding is carried out by using a shadow wood optical roller A, and UV curing is simultaneously realized, and after the film leaves the shadow wood optical roller A, textures are cured on the film. In this embodiment, UV mould pressing module selects for use the UV100 mould pressing module of platinum Ming Rui intelligent technology ltd of Foshan city, and this module uses British Parma company PM2839UV mercury lamp pipe as the ultraviolet curing light source, can effectively let the structural adhesive solidification. The input power of the UV100 mould pressing module is 20KW and can provide 600mw/cm²Ultraviolet curing energy, and maximum stamping speed of 120 m/min. The embossing die set is placed in a first color bank of the entire printer. This embodimentIn the formula, the thickness of the coating layer of the optical structure layer A is 5-50 μm, preferably 10 μm, and the effect is accomplished by using a UV molding process.

The UV light curing lamp is a light source capable of providing ultraviolet light and achieving light curing, and includes a mercury lamp, an LED lamp, and other lamps capable of providing an ultraviolet light source, and in this embodiment, 600mw/cm is preferably selected²Ultraviolet mercury lamps.

The structural adhesive a must have many important factors such as flexibility, releasability, adhesiveness, heat resistance, fullness, and three-dimensional property, and wrinkles may occur during production and transfer, so that the structural adhesive a must have flexibility. The structural adhesive A mainly forms a pattern and a front shadow, and mainly functions as a mold, so the structural adhesive A needs to be attached to a bottom film, and the adhesiveness needs to be good. Since the light reflecting release layer is to release from the back surface, the release property is required. Since the application may be thermal transfer, heat resistance is required. The shadow pattern needs to be dynamic and three-dimensional, so that the shadow pattern needs to have fullness and three-dimensional property. Tests show that the following formulas are prepared, the preparation method is mainly suitable for different production configurations, the process is not limited, and a producer can operate more easily, and specifically:

the structural adhesive A is a high solid content adhesive and comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 1-20% of a curing agent 3390; s37 release type slipping agent, 1-5%; 20-60% of ester ketone mixed solvent. Specifically, 40-60% of poly-head D240 hydroxyl polyester resin; 1-20% of a kesichuang curing agent 3390; 1-5% of a Jinmeirui S37 release slipping agent; 20-60% of ester ketone mixed solvent.

The structural adhesive A is UV adhesive and comprises the following components in percentage by mass: 30-40% of aliphatic polyurethane acrylate UV resin; 10-20% of acrylated acrylate UV resin; 1-5% of a photoinitiator; s37, 1-5% of a release slipping agent; 10-50% of monomer UV diluent. Specifically, EB264 aliphatic polyurethane acrylate UV resin accounts for 30 to 40 percent; EB745 acrylic acid esterified acrylate UV resin, 10-20%; 1-5% of a photoinitiator; 1-5% of a Jinmeirui S37 release slipping agent; 10-50% of HDDA monomer UV diluent.

The structural adhesive A is water-based adhesive and comprises the following components in percentage by mass: 50-80% of emulsion; 1-5% of a water-based curing agent; s37 release type slipping agent, 1-5%; 10-50% of monomer UV diluent. Specifically, 50-80% of Crylic RA 646H emulsion in Kaimes chemical industry and 1-5% of SY-716 aqueous curing agent from Skyowski Yu environmental protection technology Co., Ltd; 1-5% of a Jinmeirui S37 release slipping agent; 10-50% of HDDA monomer UV diluent.

And step S3, sequentially overlapping a composite light reflection release layer and a printing color layer on one side of the optical structure layer A far away from the base film, coating a structure adhesive B on one side of the printing color layer far away from the light reflection release layer, and enabling the structure adhesive B to generate the moire by utilizing the optical roller B through mould pressing or printing to form the optical structure layer B.

The light reflecting release layer has the release function and must have the functions of softness, heat resistance, weather resistance, solvent resistance, scratch resistance, recoatability and light reflection. Wrinkles may be present during the production and transfer processes, so the light reflective release layer must be flexible. The light reflecting release layer mainly forms mutually opposite lines and front shadows with the structural adhesive A, so that the light reflecting release layer has good release property. Since the light reflecting release layer is to release from the back surface, the release property is required. The application can be thermal transfer printing, so the heat resistance is required, and the heat resistance temperature is 220 ℃ for 30 minutes. The coating composition should have weather resistance, solvent resistance, scratch resistance, and recoatability, in consideration of the requirements for use. Considering that the use can be protected by adding gloss oil, the principle of light reflection in introduction must be provided, and the light reflection refers to the effect of light reflection, so that two transparent coatings are blocked, but the comprehensive performance is not influenced.

Through tests, the following formulas are prepared, the preparation method is mainly suitable for different production configurations, the process is not limited, and a producer can operate more easily, and specifically:

the light reflecting release layer can be made of one of UV paint, water-based paint and oil-based paint, in the embodiment, the light reflecting release layer is preferably made of the UV paint and comprises the following components in percentage by mass: 30-40% of aliphatic polyurethane acrylate UV resin; 10-20% of acrylated acrylate UV resin; TPO photoinitiator, 1-5%; 10-50% of monomer UV diluent; BH114 pearlescent pigment 5%. Specifically, the method comprises the following steps: 30-40% of Cyanote EB264 aliphatic polyurethane acrylate UV resin, 10-20% of Cyanote EB745 acrylated acrylate UV resin; 1-5% of a Pasteur TPO photoinitiator; 10-50% of HDDA monomer UV diluent of Cyanote company; and 5% of BH114 pearlescent pigment of Jinmeirui. It should be noted that the pearlescent pigment includes pearlescent slurry and pearlescent powder.

Wherein the resin part mainly provides a wear-resistant, easy-to-release and high-hardness coating, and the BH114 pearlescent pigment can provide a transparent metallic silver effect and plays a role in light reaction. The coating is coated by using a mesh roller, the mesh roller is coated by using a 50-line/cm mesh roller micro-gravure coating mode, the thickness of the coating is 5-50 mu m, the preferred thickness is 12 mu m, the coating just uses the optical structure layer A as a mould to generate texture on the coating, and simultaneously, the unevenness generated by the optical structure layer A can be filled and leveled, so that the printing is smoother. It is preferable to use a thickness of 12 μm, which is 10 μm just covering the optical structure layer a.

It should be noted that the pigment inks that provide strong metallic silver effects and that act as light counteractions are equivalent features of the BH114 pearlescent pigments of the present invention, and include: metallic pigments, pearlescent pigments, photonic pigments, coatings, and the like, preferably the kimberyl BH114 pearlescent pigment, which provides a transparent metallic silver effect, acting as a transparent light reaction.

The printing color layer provides wood grain color, the printing color layer is used for manufacturing a printing plate according to the wood grain color, the color effect of the wood grain is printed on the film, the color layer mainly takes resin with good flexibility as a base material, pigment and auxiliary agent are added, and the functional layer has the characteristics of heat resistance, weather resistance, light resistance, recoatability and the like.

The printing color layer comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 10-25% of a pigment; 20-60% of an ester ketone mixed solvent; wetting dispersant pigment wetting agent, 1%. Specifically, 40-60% of poly-head D170 hydroxyl polyester resin; 10-25% of corresponding pigment; 20-60% of an ester ketone mixed solvent; digao TEGO760W wetting dispersant pigment wetting agent, 1%; the pigment of the coloring material used specifically here is mainly an organic pigment of class 7 or 8 or an inorganic pigment, and mainly achieves excellent heat resistance, weather resistance and light resistance. The D170 hydroxyl-bearing polyester resin has good recoatability and is convenient for overprinting of the ink. In special cases, functional pigments can be used for the functional layer, including foaming pigments, effect pigments, fragrance temperature-change functional pigments, and the like.

The printing is performed by 1-8 plates, and the color and the functional ink are finished in a gravure overprinting mode. The resins and pigments selected for the printing color layer are not limited to the resins and pigments described above, and can be various types of resins and pigments, including urethane resins, UV-based resins, aqueous resins, and the like.

The printing color layer is printed by gravure printing, the gravure plate thickness is 60-120 lines/cm, the plate depth is 45 μm, and the printing color layer is composed of multiple printing colors, and the coating thickness is 5-20 μm, preferably 7 μm.

The optical structure layer B is formed in substantially the same manner as the optical structure layer a:

and the optical structure adhesive B is subjected to shading by a mould pressing or printing method to form an optical structure layer B, the optical structure layer B is subjected to mould pressing or printing forming on the optical structure layer B by using an optical structure roller B to generate shading, wherein the mould pressing is used for producing textures on a coating on a film material by using mould pressing, and the printing forming is used for directly feeding the optical structure roller B onto the structure roller B, scraping off much coating by a scraper, and then transferring the coating onto the film to generate the shading. Compression molding generally utilizes a molding press which is divided into a thermoforming molding press and a UV molding press, preferably a UV molding die set, wherein the UV molding die set is used for coating structural adhesive B on a film material, performing compression molding by using a shadow wood optical roller B and simultaneously realizing UV curing, and after the film leaves the shadow wood optical roller B, the texture is cured on the film. The UV100 mould pressing module that selects for use among this embodiment the production of platinum Ming Rui intelligent technology limited of Foshan city selects for use the UV mould pressing module, and this module uses British Pama company PM2839UV mercury fluorescent tube as the solidification light source, can effectively let the structural adhesive solidification. The input power of the UV100 mould pressing module is 20KW and can provide 600mw/cm²Ultraviolet curing energy, and maximum stamping speed of 120 m/min. The embossing die set is placed in a fifth type of printing station of the entire printing press. The optical structure is formed by printing, namely the optical structure adhesive B is directly fed onto the structure roller B and much coating is scraped off by a scraperTransferring the glue onto a printing color layer to generate a shading, and curing the glue subjected to mould pressing on the printing color layer through a curing process.

The structural adhesive B has multiple important factors of flexibility, adhesiveness, heat resistance, fullness and three-dimensional property, and wrinkles may exist in the production and transfer processes, so the structural adhesive B has the requirement of flexibility; the structural adhesive mainly forms lines and a front shadow, and mainly plays a role of a mold, so the structural adhesive is required to be attached to a printing color layer; when the film is applied, the film can be subjected to thermal transfer printing, so that the film is required to have heat resistance, and the film is required to have dynamic and three-dimensional effects, so that the film is required to have fullness and three-dimensional properties. Through no test, the invention provides a plurality of formulas which are prepared, are mainly suitable for different production configurations, the process is not limited, and a producer is easier to operate, and specifically:

the structural adhesive B is a high solid content adhesive and comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 1-20% of a curing agent 3390; 20-60% of ester ketone mixed solvent. Specifically, 40-60% of poly-head D240 hydroxyl polyester resin; 1-20% of a kesichuang curing agent 3390; 20-60% of ester ketone mixed solvent. Alternatively, the first and second electrodes may be,

the structural adhesive B is UV adhesive and comprises the following components in percentage by mass: 30-40% of aliphatic polyurethane acrylate UV resin; 10-20% of acrylated acrylate UV resin; 1-5% of a photoinitiator; 10-50% of monomer UV diluent. Specifically, EB264 aliphatic polyurethane acrylate UV resin accounts for 30 to 40 percent; EB745 acrylic acid esterified acrylate UV resin, 10-20%; 1-5% of a photoinitiator; 10-50% of HDDA monomer UV diluent. Alternatively, the first and second electrodes may be,

the structural adhesive B is water-based adhesive and comprises the following components in percentage by mass: 50-80% of emulsion; 1-5% of a water-based curing agent; 10-50% of monomer UV diluent. Specifically, 50-80% of an Ecrylic RA 646H emulsion in Kaimes chemical engineering; SY-716 water-based curing agent of Guangsuan Si Yu environmental protection science and technology limited company, 1-5%; 10-50% of monomer UV diluent.

The thickness of the optical structure layer B is 5-50 μm, preferably 10 μm, and the effect is achieved by using a UV molding process.

In the invention, when the optical structure layer A and the optical structure layer B are both manufactured on the same mould pressing printing production line by a mould pressing mode by using a mould pressing machine, the mould pressing machine is a separate thermoforming mould pressing machine or a UV mould pressing machine; the thickness of the optical structure layer A is 5-50 μm, preferably 10 μm. The thickness of the optical structure layer B is 5-50 μm, preferably 10 μm.

The optical structure layer A and the optical structure layer B are both pressed by a UV (ultraviolet) moulding press on the same mould pressing printing production line in a UV glue pressing mode and then are pressed by 600mw/cm²And respectively obtaining the optical structure layer A and the optical structure layer B after curing by an ultraviolet mercury lamp.

And step S4, coating or compounding the optical structure layer B on the side far away from the printing color layer to form a light reflecting layer.

The light reflecting layer has the advantages of softness, heat resistance, weather resistance, solvent resistance, recoatability, light reflecting effect and good adhesiveness. Wrinkles may exist during the production and transfer processes, so the light reflecting layer must be flexible; the application can be thermal transfer printing, so the heat resistance is required, and the heat resistance temperature is 220 ℃ for 30 minutes. The requirements of users during use need to be considered, and weather resistance, solvent resistance, scratch resistance and recoatability need to be provided; considering that the user may add a varnish protection when using, it is necessary to provide the principle of light reflection in the introduction, which means to block two transparent coatings by the action of light reflection, but not to affect the comprehensive performance. The inventor prepares the following formulas through numerous tests, mainly adapts to different production configurations, and ensures that the process is not limited and the operation of a producer is easier. The selected printing and coating process comprises the following steps: gravure printing, coating, preferably gravure printing is used.

In the present invention, the light reflecting layer may be composed of one of a UV paint, a water-based paint, and an oil-based paint. In this embodiment, the light reflecting layer is made of an oil-based paint and is formed by coating in a gravure coating manner using a 50 line/cm anilox roller, and the thickness of the light reflecting layer is 5 to 50 μm, preferably 12 μm, and the light reflecting layer is composed of the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 1-20% of a curing agent 3390; 20-60% of an ester ketone mixed solvent; BH114 nacreous pigment, 5%. Specifically, 40-60% of poly-head D240 hydroxyl polyester resin; 1-20% of a kesichuang curing agent 3390; 20-60% of an ester ketone mixed solvent; 5% of BH114 nacreous pigment of tremella.

Wherein the resin part mainly provides a good adhesive force, and the BH114 pearlescent pigment can provide a transparent metallic silver effect and plays a role in light reaction. By means of a gravure coating with a 50-line/cm anilox roller, which has a thickness of 5-50 μm, preferably 12 μm, the optical structure layer B is just filled to provide a pearlescent effect.

It should be noted that the pigment inks that provide strong metallic silver effects and that act as light counteractions are equivalent features of the BH114 pearlescent pigments of the present invention, and include: metallic pigments, pearlescent pigments, photonic pigments, coatings, and the like, preferably the kimberyl BH114 pearlescent pigment, which provides a transparent metallic pearlescent silvery white effect, acting as a transparent light reaction.

And step S5, printing a cover bottom color layer on the side of the optical reflection layer far away from the optical structure layer B, coating an adhesive layer on the side of the cover bottom color layer far away from the optical reflection layer, and finally rolling to obtain the shadow wood effect heat transfer film.

The cover bottom color layer is used for covering the cover bottom, the configuration of ink of the cover bottom color layer is consistent with that of the printing color layer, and the ink is usually white, black, gray and other color ink, and full-page printing is carried out.

The bottom color layer of the cover is one of color ink layers, mainly plays a role in covering the color of the bottom color layer, and because the colors of materials transferred by users are not consistent, the film provided by the invention has high covering effect and is more practical, the formula of the ink is diversified, the color layer mainly takes resin with good flexibility as a base material, pigment and auxiliary agent are added, and the functional layer must have the characteristics of heat resistance, weather resistance, light resistance, recoatability, good covering property and the like.

The cover and bottom color layer comprises the following components in percentage by mass: 40-60% of hydroxyl-containing polyester resin; 25-35% of titanium dioxide; 20-60% of an ester ketone mixed solvent; wetting dispersant pigment wetting agent, 1%; specifically, 40-60% of poly-head D170 hydroxyl polyester resin; 25-35% of DuPont R706 titanium dioxide; 20-60% of an ester ketone mixed solvent; digao TEGO760W wets dispersant pigment wetting agent, 1%. Can achieve excellent heat resistance, weather resistance, light resistance and covering property, and the D170 hydroxyl polyester resin has good recoatability, thereby being convenient for overprinting of printing ink. The resin and pigment selected for the under color layer are not limited to the above-mentioned resins and pigments, and can be various types of resins and pigments, including urethane resins, UV-based resins, aqueous resins, and the like. The selected printing and coating process comprises the following steps: gravure printing and coating, wherein the plate making modes of the gravure printing comprise laser plate making, electric carving plate making, corrosion plate making and extrusion plate making, and the corresponding plate making modes are selected, so that the printing fineness and the printing coating thickness can be ensured, preferably, the cover and bottom color layers are printed by using the gravure printing, the plate making depth of the gravure printing is 45 mu m, and the coating thickness is 5-20 mu m, preferably 7 mu m.

The adhesive layer bonds the transferred coating with a substrate, and the adhesive layer is required to have good adhesion fastness, boiling resistance and yellowing resistance, and in the embodiment, the polyurethane hot melt adhesive is selected, and the molecular structure of the polyurethane hot melt adhesive contains isocyanate group (-NCO) or urethane group (-NHCOO) with chemical activity and polarity, so that the adhesive layer has excellent adhesion with porous materials such as textiles, ceramics, wood, leather, paper and the like, and surface-cleaning materials such as glass, metal and the like. The polyurethane hot melt adhesive used in the invention can be divided into a reactive polyurethane hot melt adhesive and a thermoplastic polyurethane hot melt adhesive, wherein the reactive adhesive can react with moisture in the environment after being heated and is crosslinked and cured to form bonding; the thermoplastic adhesive is also called a hot melt polyurethane hot melt adhesive because it is heated and then applied to the surface of an adherend to be adhered by cooling and hardening. The reaction mechanism of the polyurethane hot melt adhesive is moisture curing, which is opposite to that of the EVA hot melt adhesive, the polyurethane hot melt adhesive can not melt after being bonded and reacted with moisture in the environment, belongs to irreversible reaction, has good adhesive strength, temperature resistance and flame retardant property, and can completely solve the use problem of the edge sealing material in high-temperature and multi-oil-smoke environments. The invention specifically uses a Freshan Merrill chemical Co., Ltd T-4129 reactive polyurethane hot melt adhesive and a T-203 thermoplastic polyurethane hot melt adhesive, and the resin selected by the hot melt adhesive is not limited to the resin and the pigment, and can relate to various types of resins, including polyester resin, waterborne polyurethane resin and the like. The adhesive layer is not necessarily printed because the polyester white glue is preset when the metal material is coated. The selected printing and coating process comprises the following steps: gravure printing, coating, spraying, preferably gravure printing is used.

The adhesive layer is made of polyurethane hot melt adhesive, gravure printing is used for the adhesive layer, the gravure plate making is 60-120 lines/cm, the printing plate making depth is 45 mu m, and the thickness of the coating is 5-20 mu m, preferably 7 mu m.

In the steps of the method, an optical structure A is pressed in a UV glue pressing mode on the same mould pressing printing production line, and the optical structure A is obtained after curing by a 600mw/cm2 ultraviolet mercury lamp; coating a light-reflecting release agent in a UV micro-concave coating mode, and curing by using a 600mw/cm2 ultraviolet mercury lamp; obtaining a release layer with light reflection; printing 1 wood wing plate and 3 wood grain color plates in a gravure printing mode, and drying at the temperature of 100-; pressing the optical structure B in a UV glue pressing mode, and curing by using a 600mw/cm2 ultraviolet mercury lamp to obtain an optical structure layer B; coating a light reflecting layer in a reticulate pattern roller coating mode, and drying at the temperature of 100-120 ℃ to obtain the light reflecting layer; printing an adhesive in a gravure printing mode, and drying at 100-120 ℃ to obtain an adhesive layer; when the wood grain transfer printing film is used, the adhesive surface faces a transfer printing workpiece, the PET surface of the film material is pressed by ironing under the condition of pressure at the temperature of 135-plus-200 ℃, the wood grain pattern can be transferred onto the workpiece, the PET film is torn off, the optical structure layer A can be peeled off, the shadow effect with complete lines, colors and shadows can be obtained on the workpiece, and the color, the shadows and the lines of the wood grain transfer printing layer after thermal transfer printing are clear, as shown in figure 3. The film of the invention has the following characteristics: the shadow and the grain are strong, and the layering sense is strong under the condition of illumination; the hand feeling texture is obvious, and the simulation degree is high; the printing color is rich, the weather resistance is high, and the chemical resistance test in all aspects is excellent; the color register lines and the shading are accurate; the transfer printing speed is high, and energy can be saved; based on a thermal transfer mechanism, the surface scratch-resistant hardening effect is better by matching with a post-hardening mode.

In the shadow transfer film prepared by the method of the invention:

bottom film: providing a basis for the printed material.

An optical structure layer A: a mold for forming the texture.

Light reflecting release layer: the release layer is formed by matching with a mold of the texture formed by the optical structure layer A, and the introduced light reaction is an important component of the whole film system, so that the release layer not only generates the texture and protects the lower color layer, but also provides the total rotation and separation guarantee and plays a role in light reaction.

Color layer: the color printing device comprises a printing color layer and a cover bottom color layer, wherein the printing color layer mainly provides printing colors, the printing color layer provides wood grain colors, and the cover bottom color layer covers the cover bottom.

An optical structure layer B: a shadow is formed.

Light reflecting layer: and plays a role of light reaction.

Adhesive layer: and the function of thermal transfer printing viscose glue is realized.

The core of the technology is as follows: the use of optical structures, the introduction of the principle of light reflection, uses a mold to form the pattern. The combination of the three technologies finally fully reflects the color, the shadow and the texture.

Because the prepared film is printed in the printing machine with the same main machine shaft (namely the same mould pressing printing production line), the color, the shadow and the grain color register are accurate, thereby expressing the real characteristics of the log in a reducibility way. When the heat transfer film is used, the texture and the color of the shadow wood can be transferred to a workpiece only by a hot pressing mode, after the basement membrane is torn off (the optical structure layer A can be torn off along with the basement membrane), the workpiece can achieve an ideal attachment effect, the texture of the shadow wood is clear and accurate, and the layers are obvious.

The invention also provides a shadow-wood effect heat transfer film with an optical structure, which comprises a bottom film, an optical structure layer A, a light reflection release layer, a printing color layer, an optical structure layer B, a light reflection layer, a bottom covering color layer and an adhesive layer which are sequentially laminated, wherein the shadow-wood transfer film with the optical structure is prepared by the preparation method of the shadow-wood effect heat transfer film with the optical structure, and the coating of the pattern, shadow, color, release, light reflection and adhesive coating of a film material is finished on one production machine shaft so as to ensure that the pattern, shadow and pattern can be effectively matched.

Compared with the prior art, the method for preparing the shadow wood effect heat transfer film with the optical structure and the shadow wood transfer film prepared by the method can transfer the texture and the color of the shadow wood to a workpiece only by a hot pressing mode, the workpiece can achieve an ideal attachment effect after the basement film is torn off, the shadow wood texture is clear and accurate, and the layers are obvious; after the innovative post-curing coating is inserted and the finished product is transferred, the UV lamp is irradiated, so that the surface hardness of the workpiece can be greatly improved. The shadow wood transfer film prepared by the method has obvious dynamic film shadow wood grains, obvious hand feeling grains, high apparent simulation degree, excellent processing performance, capability of reducing consumption of wood resources and good environmental protection effect.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.