Light-transmitting synthetic leather and preparation method thereof

Abstract

The invention discloses light-transmitting synthetic leather and a preparation method thereof. The light-transmitting synthetic leather comprises a light-transmitting leather layer, a covering layer, a pattern texture layer, an extinction layer and a light-transmitting surface layer which are sequentially stacked from bottom to top, the covering layer is provided with a light-transmitting area and a non-light-transmitting area, and the light-transmitting area forms a light-transmitting The matting layer comprises the following components in parts by weight: 100 parts of gloss oil resin, 2-10 parts of matting powder and 5-15 parts of a curing agent; the visible light transmittance of the light-transmitting synthetic leather is 0.5%-10%. According to the light-transmitting synthetic leather prepared by the preparation method disclosed by the invention, the image of a transmitted pattern is uniform under a backlight condition, and the transmitted light is soft.

Description

Technical Field

[0001] The invention relates to the technical field of artificial leather preparation, in particular to a light-transmitting synthetic leather and a preparation method thereof. Background Art

[0002] Synthetic leather is a plastic product that looks and feels like leather and can be used instead of leather. It is widely used in the automotive interior industry. With the development of the automotive interior industry, the decorative surface of synthetic leather for automobiles needs to integrate certain specific patterns to create a specific optical atmosphere effect or function. In the relevant technology, in order to present the above optical atmosphere effect, it is usually combined with the light source in the car so that the light-transmitting synthetic leather can show a specific pattern effect when it is illuminated in the backlight direction. However, due to the influence of the intensity and distribution of the irradiated light source, the light-transmitting synthetic leather has the problem of dazzling or blurred pattern light and uneven light transmission.

[0003] In addition, in the absence of backlight, the surface of the light-transmitting synthetic leather is an ordinary plane. In order to meet the needs of aesthetics or appearance diversity of the light-transmitting synthetic leather when the light is not turned on, the light-transmitting synthetic leather will also be provided with a pattern texture layer, so that when the light is not turned on, the surface of the light-transmitting synthetic leather presents a specific pattern texture layer. The pattern texture layer in the prior art is mostly obtained by printing ink on a release film, and then transferring it to the light-transmitting synthetic leather through the release film. However, the surface of the existing release film is mostly coated with silicone oil to reduce the adhesion of the release film surface to achieve the release effect, but the pattern texture printed by the ink on the release film will shrink or deform over time, resulting in poor printing effect of the pattern texture layer, which is difficult to meet the requirements of refined use. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a method for preparing light-transmitting synthetic leather. The light-transmitting synthetic leather prepared by the preparation method has uniform transmission pattern imaging and soft transmitted light under backlight conditions.

[0005] The technical solution of the present invention is:

[0006] A light-transmitting synthetic leather, characterized in that it comprises a light-transmitting leather layer, a covering layer, a pattern texture layer, a matte layer and a light-transmitting surface layer stacked in sequence from bottom to top; the covering layer has a light-transmitting area and a non-light-transmitting area, and the light-transmitting area forms a light-transmitting pattern;

[0007] The matt layer comprises, by weight, 100 parts of varnish resin, 2-10 parts of matt powder, 5-15 parts of curing agent, and 40-50 parts of n-propyl acetate; the visible light transmittance of the translucent synthetic leather is 0.5%-10%.

[0008] Furthermore, when no light is irradiated from the light-incoming side of the light-transmitting leather layer, no light-transmitting pattern will appear on the light-transmitting synthetic leather.

[0009] The light-incoming side of the light-transmitting leather layer is the direction in which light shines from the light-transmitting leather layer to the light-transmitting surface layer, that is, backlighting.

[0010] Furthermore, the matting powder includes at least one of silicon dioxide, talc, and aluminum stearate, and its particle size ranges from 1 to 5 um.

[0011] Furthermore, the covering layer includes 100 parts of opaque ink and 30-40 parts of n-propyl acetate.

[0012] Furthermore, the covering layer is a multi-layer structure, the light-transmitting area of ​​each covering layer is located at the same or different positions, and the non-light-transmitting area of ​​each covering layer is located at the same or different positions.

[0013] Furthermore, the light-transmitting surface treatment layer comprises, by weight, 100 parts of PVC powder, 1-5 parts of foaming agent, 50-60 parts of plasticizer, 2-8 parts of calcium zinc stabilizer, and 2-5 parts of surface silicone treatment agent.

[0014] The organosilicon treatment agent is an organosilicon lubricant, which gives the light-transmitting synthetic leather a smooth feel and also enables the light-transmitting synthetic leather to have good wear resistance.

[0015] Furthermore, the light-transmitting leather layer comprises a base fabric layer and a transparent bottom layer coated on the base fabric layer, and the covering layer is connected to the side of the transparent bottom layer away from the base fabric layer;

[0016] The transparent bottom layer comprises: by weight, 100 parts of PVC powder, 1-5 parts of foaming agent, 50-60 parts of plasticizer, 2-8 parts of calcium zinc stabilizer, and 10-30 parts of filler CaCO3.

[0017] The plasticizer includes at least one of dioctyl phthalate DOP and butyl phthalate DBP.

[0018] Furthermore, the base fabric layer has a thickness of 0.3-0.5 mm, the transparent bottom layer has a thickness of 0.02-0.5 mm, the covering layer has a thickness of 8-15 um, the pattern layer has a thickness of 2-3 um, the matte layer has a thickness of 2-8 um, and the light-transmitting surface layer has a thickness of 0.02-0.2 mm.

[0019] A method for preparing light-transmitting synthetic leather, used for preparing the light-transmitting synthetic leather, comprises the following preparation steps:

[0020] S1, Preparation of light-transmitting leather layer:

[0021] The components of the transparent bottom layer are mixed uniformly according to a preset ratio to obtain a transparent bottom layer slurry, the transparent bottom layer slurry is coated on the base fabric, and dried at a temperature of 100° C. to 150° C. to obtain a transparent bottom layer on the base fabric, thereby obtaining a light-transmitting leather layer;

[0022] The base fabric layer comprises at least one of polyester, nylon and spandex, preferably polyester;

[0023] S2, preparation of patterned texture layer:

[0024] A release coating slurry is coated on the original PET film, and after drying at a temperature of 100° C. to 150° C., a silicon-free transfer release film is obtained, and a pattern texture layer is printed on the silicon-free transfer release film by a gravure printer, and a light-transmitting area of ​​the covering layer is preliminarily left blank when printing the pattern texture layer;

[0025] S3, preparation of covering layer:

[0026] Printing a covering layer on the pattern texture layer in step S2 by a gravure printing machine;

[0027] S4, transfer of cover layer and pattern texture layer:

[0028] Transferring the covering layer and the pattern texture layer in step S3 to the transparent bottom layer in step S1 through a thermal transfer process, wherein the thermal transfer process temperature is 160° C.-180° C., the hot roller speed is 5-20 m / min, and the hot roller pressure is 0.3-0.6 Mpa;

[0029] S5. Preparation of matt layer

[0030] The components in the matt layer are mixed according to a preset ratio to obtain a matt layer slurry, the matt layer slurry is coated on the pattern texture layer in step S4, and dried at a temperature of 100° C.-150° C. to obtain the matt layer.

[0031] S6. Preparation of light-transmitting surface layer

[0032] The components in the light-transmitting surface layer are mixed uniformly according to a preset ratio to obtain a light-transmitting surface layer slurry, the light-transmitting surface layer slurry is coated on the matte layer in step S5, and the light-transmitting surface layer is obtained after drying at a temperature of 100°C-150°C, thereby obtaining the light-transmitting synthetic leather.

[0033] Furthermore, the release coating slurry includes, by weight, 100 parts of release resin, 0.1-0.3 parts of release curing agent, 0.1-0.4 parts of dihydroxymethyl propionic acid, 0.01-0.05 parts of acrylic leveling agent, and 50-65 parts of organic solvent.

[0034] The beneficial technical effects of the present invention are:

[0035] Firstly, the present invention provides a light-transmitting area and a non-light-transmitting area on the covering layer, and the light-transmitting area is a transmissive pattern of the light-transmitting synthetic leather of the present invention under light conditions, and the light-transmitting area and the non-light-transmitting area of ​​the covering layer are both made by a gravure printing process, which is simple to operate and convenient for quantitative production; the light-transmitting synthetic leather of the present invention adopts a matte layer to adjust its light-transmitting performance, and its light transmittance can be made into different levels of light transmittance according to actual production requirements, and its light transmittance is 0.5%-10%, and because the matte layer is evenly coated on the light-transmitting area in the covering layer, the pattern light of the transmissive pattern is uniform.

[0036] Secondly, in the prior art, PET release film is generally used for printing and transferring the pattern layer. Usually, a layer of silicone oil is coated on the surface of the PET release film to reduce the adhesion of the surface of the PET release film and achieve the release effect. As a result, the dyne value of the existing PET release film surface is too small, resulting in the pattern layer printed by the ink shrinking or deforming on the PET release film over time, resulting in poor printing effect of the pattern layer, which is difficult to meet the use requirements of customers. The dyne value of the silicone-free transfer release film of the present invention is 35-60dyn / cm, so that it has good release effect and good adhesion, and a wide range of applicable printing inks, so that the pattern layer on the silicone-free transfer release film will not shrink or deform over time, thereby ultimately ensuring the presentation effect of the light-transmitting pattern on the light-transmitting synthetic leather of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic diagram of the appearance of the light-transmitting synthetic leather of the present invention when there is no light;

[0038] Figure 2 It is a schematic diagram of the appearance of the light-transmitting synthetic leather of the present invention in a backlit state. DETAILED DESCRIPTION

[0039] In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the specific embodiments of the present invention are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention. The reagents used in the present invention are all commercially available reagents.

[0040] Example 1

[0041] This embodiment 1 provides a light-transmitting synthetic leather, comprising a light-transmitting leather layer, a covering layer, a pattern texture layer, a matte layer and a light-transmitting surface layer stacked in sequence from bottom to top; the covering layer has a light-transmitting area and a non-light-transmitting area, and the light-transmitting area forms a light-transmitting pattern after being backlit; the light-transmitting leather layer comprises a base fabric layer and a transparent bottom layer coated on the base fabric layer, and the covering layer is connected to the side of the transparent bottom layer away from the base fabric layer. It is prepared by the following preparation method, and the specific preparation steps are as follows:

[0042] S1, Preparation of light-transmitting leather layer:

[0043] The components of the transparent bottom layer are mixed uniformly according to a preset ratio to obtain a transparent bottom layer slurry, which is coated on a base fabric and dried at a temperature of 150°C for 5 minutes to obtain a transparent bottom layer on the base fabric, that is, a light-transmitting leather layer; the base fabric layer is a mesh polyester fabric (weight 100g / m 2 ), the thickness of which is 0.3 mm, and the thickness of the obtained transparent bottom layer is 0.25 mm;

[0044] In terms of weight, the transparent base layer includes 100 parts of PVC powder (Formosa Plastics S-70), 5 parts of foaming agent azodicarbonamide (Linger Bay AC1000), 60 parts of plasticizer dioctyl phthalate DOP, 8 parts of calcium zinc stabilizer (Guangzhou Yingsu New Materials T-550P), and 30 parts of filler CaCO3 (Bozhen BZ-1250).

[0045] S2, preparation of patterned texture layer:

[0046] A release coating slurry is coated on the original PET film, and the film is dried at a temperature of 150° C. for 5 minutes to obtain a silicon-free transfer release film, and a pattern texture layer is printed on the silicon-free transfer release film by a gravure printer;

[0047] By weight, the release coating slurry includes 100 parts of release resin polyethyleneimine octadecylurea (Shanghai Hanluo RP-20), 0.3 parts of release curing agent aziridine blocked isocyanate (Shanghai Xirun Chemical XR-200), 0.4 parts of dihydroxymethyl propionic acid, 0.05 parts of acrylic ester leveling agent (BYK358N), and 65 parts of butanone. The dyne value test of the silicon-free transfer release film prepared from the release coating slurry was carried out.

[0048] The dyne value is a method for evaluating the wetting properties of solid surfaces. Its measurement is commonly used in printing and can reflect whether the material is easy to print. The surface of the release film must meet a certain adhesion to facilitate the printing of ink, and also meet a good release force to facilitate the transfer of ink. In the prior art, a layer of silicone oil is usually coated on the surface of the PET release film to reduce the adhesion of the surface of the PET release film and achieve the release effect, which makes the dyne value of the existing PET release film surface too small. If the dyne value of the release film is too small, the ink pattern printed on it will shrink and deform over time, which will affect the appearance and make the surface of the ink pattern layer uneven, affecting the flatness of the subsequent covering layer and matte layer. The dyne value of the release film used for printing ink is generally in the qualified range of 35-60dyn / cm.

[0049] The dyne value was tested using a dyne value test pen (brand name: ACCU DYNE TEST) and the test standard was GB / T10006.4-2008. The dyne value of the silicone-free transfer release film in Example 1 was measured to be 45 dyn / cm.

[0050] In this embodiment 1, two pattern texture layers are printed. One pattern texture layer is printed by 100 parts of black ink (Daiichi Essence V-195) and 70 parts of n-propyl acetate, and has a thickness of 1 μm. The other pattern texture layer is printed by 100 parts of blue ink (Daiichi Essence V-164) and 70 parts of n-propyl acetate, and has a thickness of 1 μm. Both pattern texture layers are light-transmitting layers.

[0051] S3, preparation of covering layer:

[0052] Each covering layer includes white opaque ink (100 parts of Dainichi Jinghua V-701) and 40 parts of n-propyl acetate, which are mixed evenly to prepare a covering layer slurry.

[0053] A covering layer is printed on the pattern texture layer in step S2 by a gravure printing machine. In this embodiment 1, two covering layers are printed; each covering layer includes a light-transmitting area and a non-light-transmitting area, that is, the non-light-transmitting area is printed with a covering layer slurry to prevent light from passing through, and the covering layer slurry is not printed in the light-transmitting area. The light-transmitting area is a light-transmitting pattern formed after the light-transmitting synthetic leather is exposed to light. The light-transmitting area of ​​each covering layer in this embodiment 1 is a triangular hole, that is, the light-transmitting pattern formed after the light-transmitting synthetic leather is exposed to light is a triangle. The light-transmitting areas of the two covering layers printed on the pattern texture layer in this embodiment 1 are at the same position;

[0054] The total thickness of the two covering layers is 9 μm.

[0055] S4, transfer of cover layer and pattern texture layer:

[0056] The covering layer and the pattern texture layer in step S3 are transferred to the transparent bottom layer in step S1 through a thermal transfer process, wherein the thermal transfer process temperature is 160° C., the hot roller speed is 15 m / min, and the hot roller pressure is 0.5 MPa.

[0057] S5, preparation of matt layer:

[0058] The components in the matt layer are mixed according to a preset ratio to obtain a matt layer slurry, and the matt layer slurry is coated on the pattern texture layer in step S4, and dried at a temperature of 150° C. for 5 minutes to obtain a matt layer with a thickness of 3 μm.

[0059] The matte layer includes, by weight, 100 parts of varnish resin (Ante New Material Flat PU varnish resin), 8 parts of silica matting powder (Japan Tosoh E1011, particle size 1.7 μm), 9 parts of curing agent (Covestro L75 (C)), and 40 parts of n-propyl acetate.

[0060] S6, preparation of light-transmitting surface layer:

[0061] The components in the light-transmitting surface layer are mixed uniformly according to a preset ratio to obtain a light-transmitting surface layer slurry, and the light-transmitting surface layer slurry is coated on the matte layer in step S5, and dried at a temperature of 150° C. for 6 min to obtain a light-transmitting surface layer, thereby obtaining the light-transmitting synthetic leather of Example 1, wherein the thickness of the light-transmitting surface layer is 0.1 mm;

[0062] The light-transmitting surface treatment layer includes, by weight, 100 parts of PVC powder (Formosa Plastics S-70), 5 parts of azodicarbonamide (Linger Bay AC1000), 60 parts of dioctyl phthalate DOP, 8 parts of calcium zinc stabilizer, and 5 parts of surface silicone treatment agent (Tego Foamex 842).

[0063] Example 2

[0064] This embodiment 2 provides a light-transmitting synthetic leather, which is different from the light-transmitting synthetic leather of embodiment 1 in that the types of components in the matte layer are the same, but the contents of the components and their thicknesses are different.

[0065] The matte layer of Example 2 includes 100 parts of varnish resin (Ante New Material Flat PU Varnish), 2 parts of silica matte powder (Tosoh E1011, Japan, particle size 2.5 μm), 6 parts of curing agent (Covestro L75 (C)), and 40 parts of n-propyl acetate, and the matte layer has a thickness of 2 μm.

[0066] Example 3

[0067] This embodiment 3 provides a light-transmitting synthetic leather, which is different from the light-transmitting synthetic leather of embodiment 1 in that the added amounts of each component of the release coating slurry are different and the dyne value of the silicone-free transfer release film made from it is different, and the type of matting powder in the matting layer and its added amount are different, and the thickness of the matting layer is also different.

[0068] The release coating slurry of Example 3 includes, by weight, 100 parts of release resin polyethyleneimine octadecyl urea (Shanghai Hanluo RP-20), 0.1 parts of release curing agent aziridine blocked isocyanate (Shanghai Xirun Chemical XR-200), 0.1 parts of dihydroxymethylpropionic acid, 0.02 parts of acrylic ester leveling agent (BYK358N), and 50 parts of butanone. The dyne value of the silicone-free transfer release film prepared therefrom is 40 dyn / cm.

[0069] The matte layer of Example 3 includes, by weight, 100 parts of varnish resin (Ante New Material Matt PU Varnish), 5 parts of matte powder (Japan Tosoh Silica Matting Powder E1011, particle size 3 μm), 10 parts of curing agent (Covestro L75 (C)), and 40 parts of n-propyl acetate, and the matte layer has a thickness of 3.5 μm.

[0070] Example 4

[0071] This embodiment 4 provides a light-transmitting synthetic leather, which differs from the light-transmitting synthetic leather of embodiment 1 in that the amount of each component added in the transparent base layer and its thickness are different, the ink colors and models used in the two covering layers are different and their thicknesses are different, and the amount of each component added in the light-transmitting surface layer and its thickness are different.

[0072] In Example 4, the transparent bottom layer includes, by weight, 100 parts of PVC powder, 2 parts of azodicarbonamide, a foaming agent, 50 parts of dioctyl phthalate DOP, a plasticizer, 2 parts of calcium zinc stabilizer, and 15 parts of filler CaCO3, and the thickness of the transparent bottom layer is 0.2 mm;

[0073] Both covering layers are made of, by weight, gray opaque ink (70 parts of Dainichi Essence V-195 black ink, 30 parts of Dainichi Essence V-164 blue ink) and 35 parts of n-propyl acetate, which are mixed evenly to obtain a covering layer slurry. The total thickness of the two covering layers obtained by printing is 10 μm.

[0074] The light-transmitting surface treatment layer comprises, by weight, 100 parts of PVC powder, 3 parts of azodicarbonamide, 55 parts of dioctyl phthalate DOP, 7 parts of chlorinated paraffin, 5 parts of calcium zinc stabilizer, 20 parts of filler CaCO3, and 3 parts of surface silicone treatment agent (Tego Foamex 842). The thickness of the light-transmitting surface treatment layer is 0.08 mm.

[0075] The light transmittance test was performed on the light-transmitting synthetic leather of Examples 1-4. The light transmittance test was performed using an LS108A optical transmittance meter in accordance with the test standard FZ / T01009-2008.

[0076] Table 1

[0077]

[0078] The test results of Examples 1-4 are shown in Table 1. The synthetic leathers of Examples 1-4, the surface of the light-transmitting synthetic leather of Example 1 is as follows under the condition of no light: Figure 1 The pattern texture layer appearance shown in FIG. 1 has uniform texture lines; Figure 2 As shown, the light of the light-transmitting pattern of the light-transmitting synthetic leather of Example 1 under backlight illumination is soft and the imaging is uniform.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A light-transmitting synthetic leather, characterized in that: It comprises a light-transmitting leather layer, a covering layer, a pattern texture layer, a matte layer and a light-transmitting surface layer which are stacked in sequence from bottom to top; the covering layer has a light-transmitting area and a non-light-transmitting area, and the light-transmitting area forms a light-transmitting pattern; The matt layer comprises, by weight, 100 parts of varnish resin, 2-10 parts of matt powder, 5-15 parts of curing agent, and 40-50 parts of n-propyl acetate; the visible light transmittance of the translucent synthetic leather is 0.5%-10%.

2. The light-transmitting synthetic leather according to claim 1, characterized in that: When no light is irradiated from the light-incoming side of the light-transmitting leather layer, the light-transmitting pattern will not appear on the light-transmitting synthetic leather.

3. The light-transmitting synthetic leather according to claim 1, characterized in that: The matting powder includes at least one of silicon dioxide, talc and aluminum stearate, and its particle size ranges from 1 to 5 μm.

4. The light-transmitting synthetic leather according to claim 1, characterized in that: The covering layer comprises 100 parts of opaque ink and 30-40 parts of n-propyl acetate.

5. The light-transmitting synthetic leather according to claim 1, characterized in that: The covering layer is a multi-layer layer, and the light-transmitting regions of each covering layer are located at the same or different positions, and the non-light-transmitting regions of each covering layer are located at the same or different positions.

6. The light-transmitting synthetic leather according to claim 1, characterized in that: The light-transmitting surface treatment layer comprises, by weight, 100 parts of PVC powder, 1-5 parts of foaming agent, 50-60 parts of plasticizer, 2-8 parts of calcium zinc stabilizer, and 2-5 parts of surface organic silicon treatment agent.

7. The light-transmitting synthetic leather according to claim 1, characterized in that: The light-transmitting leather layer comprises a base fabric layer and a transparent bottom layer coated on the base fabric layer, and the covering layer is connected to the side of the transparent bottom layer away from the base fabric layer; The transparent bottom layer comprises, by weight, 100 parts of PVC powder, 1-5 parts of foaming agent, 50-60 parts of plasticizer, 2-8 parts of calcium zinc stabilizer, and 10-30 parts of filler CaCO3.

8. The light-transmitting synthetic leather according to claim 7, characterized in that: The base fabric layer has a thickness of 0.3-0.5 mm, the transparent bottom layer has a thickness of 0.02-0.5 mm, the covering layer has a thickness of 8-15 um, the pattern layer has a thickness of 2-3 um, the matte layer has a thickness of 2-8 um, and the light-transmitting surface layer has a thickness of 0.02-0.2 mm.

9. A method for preparing light-transmitting synthetic leather according to any one of claims 1 to 8, characterized in that: The method comprises the following preparation steps: S1, Preparation of light-transmitting leather layer: The components of the transparent bottom layer are mixed uniformly according to a preset ratio to obtain a transparent bottom layer slurry, the transparent bottom layer slurry is coated on the base fabric, and dried at a temperature of 100° C. to 150° C. to obtain a transparent bottom layer on the base fabric, thereby obtaining a light-transmitting leather layer; S2, preparation of patterned texture layer: A release coating slurry is coated on the original PET film, and after drying at a temperature of 100° C. to 150° C., a silicon-free transfer release film is obtained, and a pattern texture layer is printed on the silicon-free transfer release film by a gravure printer; S3, preparation of covering layer: Printing a covering layer on the pattern texture layer in step S2 by a gravure printing machine; S4, transfer of cover layer and pattern texture layer: Transferring the covering layer and the pattern texture layer in step S3 to the transparent bottom layer in step S1 through a thermal transfer process, wherein the thermal transfer process temperature is 160° C.-180° C., the hot roller speed is 5-20 m / min, and the hot roller pressure is 0.3-0.6 Mpa; S5, preparation of matt layer: The components in the matt layer are mixed uniformly according to a preset ratio to obtain a matt layer slurry, the matt layer slurry is coated on the pattern texture layer in step S4, and dried at a temperature of 100° C. to 150° C. to obtain a matt layer; S6, preparation of light-transmitting surface layer: The components in the light-transmitting surface layer are mixed uniformly according to a preset ratio to obtain a light-transmitting surface layer slurry, the light-transmitting surface layer slurry is coated on the matte layer in step S5, and the light-transmitting surface layer is obtained after drying at a temperature of 100°C-150°C, thereby obtaining the light-transmitting synthetic leather.

10. The method for preparing light-transmitting synthetic leather according to claim 9, characterized in that: The release coating slurry comprises, by weight, 100 parts of release resin, 0.1-0.3 parts of release curing agent, 0.1-0.4 parts of dihydroxymethyl propionic acid, 0.01-0.05 parts of acrylic ester leveling agent, and 50-65 parts of organic solvent.

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