阅读说明：本技术 合成皮 (Synthetic leather ) 是由 林俊伟 于 2021-06-10 设计创作，主要内容包括：本发明涉及一种合成皮,所述合成皮包含基布、形成在该基布上的高分子层以及覆盖该高分子层的表面单元,该表面单元为功能层或功能层与印刷层的组合。该高分子层由以聚乙烯醇缩丁醛为主的组合物形成,该组合物不包括含有异氰酸酯基的交联剂。该功能层由包括主剂的材料形成,并且该主剂是聚氨酯、环氧树脂、聚丙烯酸甲酯或聚乙烯醇缩丁醛；当该主剂为聚乙烯醇缩丁醛时,该材料还包括含有异氰酸酯基的交联剂。本发明的合成皮具备耐候性、耐磨性、耐挠曲性等性质,并且表面可具有多样性的印刷图案。(The invention relates to a synthetic leather, which comprises a base cloth, a high polymer layer formed on the base cloth and a surface unit covering the high polymer layer, wherein the surface unit is a functional layer or a combination of the functional layer and a printing layer. The polymer layer is formed from a composition mainly composed of polyvinyl butyral, and the composition does not include a crosslinking agent containing an isocyanate group. The functional layer is formed of a material including a main agent, and the main agent is polyurethane, epoxy resin, polymethyl acrylate, or polyvinyl butyral; when the main agent is polyvinyl butyral, the material also comprises a crosslinking agent containing isocyanate groups. The synthetic leather has the properties of weather resistance, wear resistance, flexing resistance and the like, and the surface of the synthetic leather can have diversified printing patterns.)

1. A synthetic leather, comprising:

a base cloth;

a polymer layer formed on the base fabric and composed of a composition mainly composed of polyvinyl butyral, the composition not including a crosslinking agent containing an isocyanate group; and

a surface unit that covers the polymer layer and is a functional layer or a combination of a functional layer and a printed layer;

wherein the functional layer is formed from a material comprising a host agent, and the host agent is polyurethane, epoxy, polymethyl acrylate, or polyvinyl butyral; when the main agent is polyvinyl butyral, the material further comprises a crosslinking agent containing an isocyanate group.

2. The synthetic leather of claim 1, wherein the surface element is a functional layer.

3. The synthetic leather of claim 2, further comprising a second adhesive layer disposed between the functional layer and the polymeric layer.

4. The synthetic skin of claim 1, wherein the surface element is a combination of a functional layer and a printed layer; the printing layer covers the polymer layer, and the functional layer covers the printing layer.

5. The synthetic leather of claim 4, further comprising a second adhesive layer disposed between the printed layer and the polymeric layer.

6. The synthetic skin of claim 1, wherein the surface element is a combination of a functional layer and a printed layer; the functional layer covers the polymer layer, and the printing layer covers the functional layer.

7. The synthetic leather of claim 6, further comprising a second adhesive layer disposed between the functional layer and the polymeric layer.

8. The synthetic leather of claim 6, further comprising a surface functional layer formed on the printed layer.

9. The synthetic leather of claim 8, further comprising a second adhesive layer disposed between the functional layer and the polymeric layer.

10. The synthetic leather of any one of claims 1 to 9, further comprising a first adhesive layer disposed between the base fabric and the polymeric layer.

11. Synthetic leather according to any one of claims 1 to 9, wherein the main agent is polyurethane, the material further comprising a cross-linking agent comprising isocyanate groups.

Technical Field

The invention relates to a synthetic leather, in particular to a synthetic leather containing a polyvinyl butyral (PVB) layer.

Background

Referring to fig. 1, chinese utility model No. 201437574 proposes a multifunctional laminate comprising a fabric layer 100 and a first film layer 101 formed on the fabric layer 100. The first film layer 101 is formed from a film composition comprising a polymeric component selected from PVB. The multifunctional laminate has a first film layer mainly made of PVB on the surface, and the following problems can still exist in practical use: (1) when the temperature is above 30 ℃, the PVB layer on the surface has sticky feeling, so that the touch feeling is poor; (2) insufficient wear resistance of the surface; (3) poor low-temperature flex resistance, and the like. It is thus clear that a film layer based on PVB is not suitable as a surface for synthetic leather and its related applications.

As can be seen from the above description, although PVB can meet the requirement of environmental protection and can replace materials such as polyvinyl chloride (PVC), some properties required for the above synthetic leather still need to be further improved.

Disclosure of Invention

Accordingly, an object of the present invention is to provide a synthetic leather having weather resistance, wear resistance, and flexing resistance (particularly low-temperature flexing resistance) and having a good surface touch.

Therefore, the synthetic leather of the present invention comprises a base fabric, a polymer layer formed on the base fabric, and a surface unit covering the polymer layer; the surface unit is a functional layer or a combination of the functional layer and a printing layer. The polymer layer is formed from a polyvinyl butyral-based composition that does not include a crosslinking agent containing an isocyanate group (isocyanate group). The functional layer is formed of a material including a main agent, which is Polyurethane (PU), epoxy resin (epoxy resin), polymethyl acrylate (PMA), or PVB; when the host is PVB, the material further includes a crosslinker comprising isocyanate groups. In accordance with the present invention, a PVB-based composition is defined as a composition having a PVB content in a range of from 50% to 100% by weight, based on the total weight of the composition.

In the synthetic leather of the present invention, the surface unit may be a functional layer. In some embodiments, the synthetic leather of the present invention may further comprise a second adhesive layer disposed between the functional layer and the polymeric layer.

In the synthetic leather of the present invention, the surface unit may be a combination of a functional layer and a printed layer; the printing layer covers the polymer layer, and the functional layer covers the printing layer. Therefore, the surface of the synthetic leather may have various printed patterns. In some embodiments, the synthetic leather of the present invention may further comprise a second adhesive layer disposed between the printing layer and the polymer layer.

In the synthetic leather of the present invention, the surface unit may be a combination of a functional layer and a printed layer; the functional layer covers the polymer layer, and the printing layer covers the functional layer. In some embodiments, the synthetic leather of the present invention may further comprise a second adhesive layer disposed between the functional layer and the polymeric layer.

In the synthetic leather of the present invention, the synthetic leather of the present invention may further include a surface functional layer formed on the printing layer. In some embodiments, the synthetic leather of the present invention may further comprise a second adhesion layer disposed between the functional layer and the polymer layer.

The synthetic leather of the invention may further comprise a first adhesive layer, and the first adhesive layer is arranged between the base cloth and the polymer layer.

In the synthetic leather of the present invention, when the main agent of the material forming the functional layer is polyurethane, the material further includes a crosslinking agent containing an isocyanate group.

The invention has the following effects: the synthetic leather of the present invention has properties such as weather resistance, abrasion resistance, flexing resistance (particularly, low-temperature flexing resistance) and good surface touch by providing a surface unit on a polymer layer formed of a composition mainly composed of PVB, and is advantageous for the subsequent printing work.

Drawings

Fig. 1 is a schematic side view of a prior art laminate comprising PVB layers.

FIG. 2 is a schematic side view of example 1.

FIG. 3 is a schematic side view of example 2.

FIG. 4 is a schematic side view of example 3.

FIG. 5 is a schematic side view of example 4.

FIG. 6 is a schematic side view of embodiment 4 further comprising a first adhesion layer and a second adhesion layer.

Detailed Description

The invention will be further described in the following examples, but it should be understood that these examples are for illustrative purposes only and are not to be construed as limiting the practice of the invention.

The technical means adopted by the invention to achieve the preset invention aim are further described in the following by combining the preferred embodiments of the invention with the accompanying drawings.

Before describing the present invention in detail, it should be noted that like elements are identified with the same reference numerals throughout the following description.

Referring to fig. 2, example 1 of the synthetic leather of the present invention includes a base cloth 1, a polymer layer 2, and a surface unit 3. The polymer layer 2 is formed on the base cloth 1, and the surface unit 3 covers the polymer layer 2. In the synthetic leather of example 1, the surface unit 3 is a functional layer 31.

The base fabric 1 may be any fabric suitable for synthetic leather. The base fabric 1 may be in the form of woven fabric, non-woven fabric, or the like. The material for making the base fabric 1 may be, for example, but not limited to, polyester (polyester), Nylon (Nylon), acrylic resin (acrylic resin), polyolefin (polyolefin), polyurethane, hemp, cotton, etc. The thickness of the base fabric 1 can be adjusted according to the practical application of the synthetic leather. Preferably, the thickness of the base fabric 1 ranges from 0.09 millimeters (mm) to 25 mm. More preferably, the thickness of the base fabric 1 ranges from 0.18 mm to 8 mm.

The polymer layer 2 is formed of a composition which is based on PVB and does not include a crosslinking agent containing an isocyanate group. The composition constituting the polymer layer 2 does not include a crosslinking agent containing an isocyanate group in order to avoid that the polymer layer 2 is too hard in texture and may cause a reduction in moldability.

Preferably, the polymer layer 2 is formed of a composition including PVB and a plasticizer component for assisting the polymer layer 2 in bonding with the base fabric 1 and increasing the moldability of the polymer layer 2; the plasticizer component is, for example but not limited to: tributyl acetyl citrate (ATBC), trioctyl acetyl citrate (ATOC), alkylbenzyl phthalate (alkyl phthalate) such as butylbenzyl phthalate (butyl benzyl phthalate), alkylphthalate (alkyl phthalate), blown linseed oil (blown linked oil), butyl ricinoleate (butyl ricinoleate), castor oil (castor oil), dialkyl adipate (dialkyl adipate), such as dihexyl adipate), dioctyl adipate (DOA), dialkyl adipate (dibutyl phthalate, DBP), dioctyl phthalate (dioctyl phthalate), dialkyl phthalate (dibutyl phthalate), dibutyl phthalate (dibutyl phthalate-dibutyl glycol), dibutyl phthalate (dibutyl-butyl glycol-dimethyl di), N-butyl glycol-dimethyl phthalate (dibutyl phthalate), isodecyl diphenyl phosphate (isodecyl diphenyl phosphate), N-ethyltoluene sulfonamide (N-ethyl toluene sulfonamide), polyethylene glycol (polyethylene glycol), tert-butyl diphenyl phosphate (tert-butyl diphenyl phosphate), toluene sulfonamide (tolyene sulfonamide), triaryl phosphate blend (triaryl phosphate ester blend), tributyl citrate (tributyl citrate, TBC), tricresyl phosphate (tricresyl phosphate, TCP), triethyl citrate (trietyl citrate, TEC), triethylene glycol (triethylene glycol), triethylene glycol bis (2-ethylhexanoate), triphenyl phosphate (trienyl phosphate), 2-ethylhexyl diphenyl phosphate (2-ethylhexyl diphenyl phosphate), or any combination of the foregoing.

Preferably, the composition constituting the polymer layer 2 may optionally contain other ingredients such as, but not limited to: a crosslinking agent containing no isocyanate group, a lubricant, an antioxidant, an ultraviolet absorber, a polymer modifier, a pigment and a filler.

Preferably, the lubricant is selected from the group consisting of: polyethylene wax (polyethylene wax), stearic acid (stearic acid), zinc stearate (zinc octodecanoate), calcium stearate (calcium octodecanoate), and any combination of the foregoing.

Preferably, the polymeric modifier is selected from the group consisting of: poly (methyl methacrylate), abbreviated to PMMA), ethylene-vinyl acetate copolymer (abbreviated to EVA), methyl methacrylate-butadiene-styrene copolymer (abbreviated to MBS), styrene-butadiene rubber (abbreviated to SBR), thermoplastic polyurethane (abbreviated to TPU), and any combination thereof. This is used to adjust physical properties of the polymer layer 2 such as hardness, impact resistance, cold resistance, and flexure resistance.

The thickness of the polymer layer 2 can be adjusted according to practical requirements, and preferably, the thickness of the polymer layer 2 ranges from 0.03 mm to 20 mm. More preferably, the thickness of the polymer layer 2 ranges from 0.03 mm to 0.8 mm.

The functional layer 31 is formed of a material including a host agent. According to the invention, the main agent is contained in an amount of 50 to 100 wt% based on the total weight of the material. The host is the major component of the material and may be polyurethane, epoxy, polymethyl acrylate, or PVB. When the host is PVB, the material further comprises a crosslinking agent containing isocyanate groups, so that the hardness of the functional layer 31 produced is higher than that of the polymeric layer 2. Preferably, the hardness of the functional layer 31 is shore hardness (shore hardness)40A to 80D; the hardness of the polymer layer 2 is shore 20A to 50D.

Preferably, the material may optionally include a cross-linking agent, a matting agent, a pigment, a lubricant, and the like, depending on the selected base agent, which may satisfy the desired surface properties of the synthetic leather. Such as, but not limited to, silica.

The thickness of the functional layer 31 can be adjusted according to actual requirements, and preferably, the thickness of the functional layer 31 ranges from 0.01 mm to 0.8 mm. More preferably, the functional layer 31 has a thickness in the range of 0.01 mm to 0.12 mm.

The material forming the functional layer 31 may be, for example, but not limited to, the material composition listed in table 1 below:

TABLE 1

Preferably, the synthetic leather of example 1 may further optionally include a second adhesive layer (not shown in fig. 2) disposed between the functional layer 31 and the polymer layer 2.

Preferably, the thickness of the second adhesive layer ranges from 0.01 mm to 0.08 mm.

The second adhesive layer may use the adhesives of table 2 below:

TABLE 2

The synthetic leather of example 1 can be prepared using known preparation methods, for example: coating the composition on the base fabric 1 by means of coating, and then drying to form a polymer layer 2; then, according to the functional layer 31 to be formed and the type of the main agent, a coating or rolling attaching mode is selected to form the functional layer 31 to cover the polymer layer 2, wherein if the material forming the functional layer 31 is an aqueous suspension or an oily solution, the coating mode can be selected; if the material forming the functional layer 31 is a solid, a rolling and bonding method is selected.

Example 2 of the synthetic leather of the present invention is shown in fig. 3, which is similar in structure to example 1 except that: the surface unit 3 of example 2 is a combination of a printed layer 32 that covers the polymer layer 2 and a functional layer 31 that covers the printed layer 32.

The ink material for forming the printed layer 32 may be a general water-based ink or an oil-based ink, and the ink for forming the printed layer 32 may also include PVB in order to stably cover the polymer layer 2, and for example, the ink material may include 100 parts by weight of a PVB solution, 0 to 25 parts by weight of silica, 0 to 20 parts by weight of polyethylene wax, and 3 to 15 parts by weight of an oil-based pigment.

The ink material forming the printed layer 32 may use the ink materials listed in the following table 3:

TABLE 3

Preferably, the synthetic leather of example 2 may further optionally include a second adhesive layer (not shown in fig. 3) disposed between the printing layer 32 and the polymer layer 2. Preferably, the thickness of the second adhesive layer ranges from 0.01 mm to 0.08 mm. The adhesive forming the second adhesive layer was as described in example 1.

Example 3 of the synthetic leather of the present invention is shown in fig. 4, which is similar in structure to example 1 except that: the surface unit 3 of example 3 is a combination of a functional layer 31 covering the polymer layer 2 and a printed layer 32 covering the functional layer 31.

Preferably, the synthetic leather of embodiment 3 may further optionally include a second adhesive layer (not shown in fig. 4) disposed between the functional layer 31 and the polymer layer 2. Preferably, the thickness of the second adhesive layer ranges from 0.01 mm to 0.08 mm. The adhesive forming the second adhesive layer was as described in example 1.

Example 4 of the synthetic leather of the present invention is shown in fig. 5, which is similar in structure to example 3 except that: the synthetic leather of example 4 further comprises a surface functional layer 4 formed on the printed layer 32.

The surface functional layer 4 is similar to the functional layer 31 in composition, preparation method and thickness range, and can be prepared with reference to the functional layer 31 of example 1.

Preferably, the synthetic leather of example 4 may further optionally include a second adhesive layer (not shown in fig. 5) disposed between the functional layer 31 and the polymer layer 2. Preferably, the thickness of the second adhesive layer ranges from 0.01 mm to 0.08 mm. The adhesive forming the second adhesive layer was as described in example 1.

The synthetic leather of examples 1 to 4 may further optionally include a first adhesive layer disposed between the base fabric 1 and the polymer layer 2. The thickness range of the first adhesive layer and the selected adhesive can be referred to the second adhesive layer. Taking the synthetic leather of example 4 as an example, when the synthetic leather further comprises a first adhesive layer and a second adhesive layer, the structure of the synthetic leather is shown in fig. 6, and the synthetic leather comprises a first adhesive layer 5 disposed between the base fabric 1 and the polymer layer 2, and a second adhesive layer 6 disposed between the functional layer 31 and the polymer layer 2.

And (3) characteristic analysis: low temperature flex resistance

To ensure the experimental significance of the characteristic analysis, each example and the reference example were analyzed by the same ASTM D6182 standard method, and each of examples 1-1 to 1-4 had a laminate structure as in fig. 2, the main difference between examples 1-1 to 1-4 being the thickness of the functional layer 31. In addition, the reference example does not have the functional layer 31, but has a laminated structure as in fig. 1.

Base fabric 1 of examples 1-1 to 1-4 and fabric layer 100 of reference example: a knitted fabric having a thickness of 0.30 mm;

polymer layer 2 of examples 1-1 to 1-4 and first film layer 101 of reference example: a PVB-based layer having a thickness of 0.45 mm and a shore hardness of 42A;

functional layer 31 of examples 1-1 to 1-4: an oily solution containing oily ether polyurethane and an oily isocyanate crosslinking agent is coated on the polymer layer 2, wherein the content of the oily ether polyurethane is 100 parts by weight, and the content of the oily isocyanate crosslinking agent is 7 parts by weight; the solid content of the oily ether polyurethane in the oily solution was 25% by weight; the viscosity of the oily solution was 2500 centipoise (cps). Further, the shore hardness of the functional layer 31 was 85A.

TABLE 4

From the flexing resistance test results in table 4, it is understood that examples 1-1 to 1-4 have good low-temperature flexing resistance due to the functional layer.

As described above, the synthetic leather of the present invention does not have problems such as poor touch, insufficient surface abrasion resistance, and poor low-temperature flexing resistance due to the surface stickiness caused at a temperature of 30 ℃ or higher by providing the surface unit on the polymer layer formed of the composition mainly including PVB, and thus can surely achieve the object of the present invention.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can use the above technical contents to make many changes or modifications and equivalent embodiments with equivalent changes, without departing from the technical scope of the present invention, but all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the technical scope of the present invention.