Preparation method of semi-permeable noctilucent interlayer synthetic leather with high light transmission

Abstract

The invention discloses a preparation method of high-light-transmission semi-transparent noctilucent interlayer synthetic leather, which comprises the following steps: blade-coating surface layer slurry on release paper, and drying to form a surface layer; latex pattern printing is conducted on the surface layer, and a latex printing layer is formed after drying; the latex printing layer is coated with noctilucent layer slurry in a blade coating mode, and a noctilucent layer is formed after drying; coating a bottom material connecting layer sizing agent on the noctilucent layer in a scraping manner, and drying to a semi-dry state to form a bottom material connecting layer; the base material connecting layer and the high-low temperature film are subjected to veneering compounding; and drying, stripping, cooling and rolling the compounded material to obtain the high-light-transmission semi-transparent noctilucent interlayer synthetic leather. According to the synthetic leather, due to the interlayer structure design and the combination of the in-film printing technology, perfect fusion of pattern display which is high in light transmittance and full in color in the daytime and the uniform and lasting noctilucent effect at night is achieved, and the attractiveness, the identification degree and the scene applicability of a product are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of synthetic leather technology, specifically to a method for preparing highly transparent, semi-transparent, luminous interlayer synthetic leather. Background Technology

[0002] Synthetic leather, as an important material widely used in footwear, apparel, bags, home furnishings, and automotive interiors, is increasingly trending towards functionalization, personalization, and environmental friendliness. However, traditional synthetic leather manufacturing technologies, especially in surface decoration and visual effect enhancement, face numerous bottlenecks.

[0003] Firstly, in terms of visual presentation, the colors and patterns of traditional synthetic leather are mainly achieved through processes such as roller coating, printing, or lamination. This results in problems such as unnatural color gradations, insufficient layering and three-dimensionality of patterns, and limited design flexibility. Although digital printing technology has made personalized patterns possible, how to firmly bond the printed pattern to the synthetic leather substrate and maintain its vibrant color for a long time, without sacrificing the leather's supple feel, remains a technical challenge.

[0004] Secondly, in terms of functional expansion, luminescent materials offer the possibility of adding nighttime visibility and decorative effects to synthetic leather. A common approach is to directly mix luminescent powder into the surface resin. However, this approach has significant drawbacks: first, the luminescent powder particles may affect the transparency and surface gloss of the surface layer, resulting in a cloudy daytime visual effect and reduced texture; second, the luminescent powder is exposed on the outermost layer, directly subjected to friction and external environmental factors, easily leading to wear and peeling of the luminescent layer, resulting in poor durability; and third, it is difficult to achieve precise and independent control of the luminescent effect and colored patterns, resulting in a limited visual expression.

[0005] Therefore, developing a new type of synthetic leather and its preparation method that can simultaneously achieve high light transmittance, semi-transparent visual effects, long-lasting luminescence, and excellent durability, while also being produced in an environmentally friendly process and supporting rapid customization of personalized patterns, has become a pressing technical problem to be solved in this field. This is not only necessary to improve the added value and aesthetics of synthetic leather products, but also an inevitable requirement to promote the upgrading of the synthetic leather industry towards green, digital, and high-performance directions. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a method for preparing a high-transmittance semi-transparent luminous laminated synthetic leather. Through a laminated structure design and in-film printing process, this synthetic leather achieves a perfect fusion of high light transmittance and rich color pattern display during the day and uniform and long-lasting luminous effect at night, significantly improving the product's aesthetics, recognizability, and applicability to various scenarios.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing high-transmittance semi-transparent luminous interlayer synthetic leather, comprising the following steps: (1) Apply the surface layer slurry to the release paper and dry it to form the surface layer; (2) Print a latex pattern on the surface layer and dry it to form a latex printing layer; (3) Apply the luminescent layer paste to the latex printing layer and dry it to form a luminescent layer; the luminescent layer paste includes the following components in parts by weight: 100 parts of first resin, 60±5 parts of DMF, 20±5 parts of methyl ethyl ketone, and 30±5 parts of luminescent powder, wherein the viscosity of the luminescent layer paste is 2800±300cps. (4) Apply the base material bonding layer slurry to the luminescent layer and bake it until it is semi-dry to form the base material bonding layer; (5) The semi-dry base material bonding layer is laminated with the high and low temperature film; (6) The composite material is dried, peeled, cooled and rolled up to obtain a high-transparency semi-transparent luminous interlayer synthetic leather.

[0008] Furthermore, the surface layer slurry comprises the following components in parts by weight: 100 parts of the first resin, 60±5 parts of DMF, and 20±5 parts of methyl ethyl ketone, wherein the viscosity of the surface layer slurry is 2700±300 cps.

[0009] Furthermore, the latex pattern printing uses water-based latex ink and is printed using a latex flatbed printer. The printed pattern format is TIF, and after printing, it is dried at a temperature above 120℃.

[0010] Furthermore, the substrate bonding layer slurry comprises the following components in parts by weight: 100 parts of second resin, 10±2 parts of DMF, and 40±5 parts of methyl ethyl ketone, wherein the viscosity of the substrate bonding layer slurry is 4500±500 cps.

[0011] Furthermore, the thickness of the high and low temperature film is 0.4±0.05mm.

[0012] Furthermore, the high and low temperature film is a TPU film.

[0013] Furthermore, the release paper is a high-gloss, plain-textured release film.

[0014] Furthermore, in step (5), before the base material bonding layer and the high and low temperature film are laminated, the temperature of the laminating roller should be raised to 150°C in advance, and the speed of the laminating roller should be controlled at 2-3 m / s; the high and low temperature film is placed above the laminating roller, and the release film coated with the base material bonding coating is placed below the laminating roller. After lamination, it is placed in a 10-meter, 90°C oven and dried under the condition of air supply at 300 rpm.

[0015] The method for preparing high-transmittance semi-transparent luminous interlayer synthetic leather of the present invention has the following beneficial effects: 1. A dual breakthrough in visual performance and functional innovation: Through the sandwich structure design of "surface layer - latex printing layer - luminescent layer - base material bonding layer - high and low temperature film", combined with in-film printing technology, the synthetic leather achieves a perfect fusion of high light transmittance and rich color pattern display during the day and uniform and long-lasting luminescent effect at night, which significantly improves the aesthetics, recognizability and scene applicability of synthetic leather products.

[0016] 2. Significantly improved structural stability and durability: The latex printing layer is embedded between the top layer and the luminescent layer, which is effectively protected. Its pattern adhesion is strong and its wear resistance and scratch resistance are excellent. Each functional layer is tightly bonded to the high and low temperature film through the base material connecting layer, resulting in high overall peel strength and long service life.

[0017] 3. Environmentally friendly and efficient production process: Using water-based latex inks greatly reduces VOC emissions, meeting green manufacturing requirements. Latex printing supports rapid output of digital and personalized patterns in a single pass, simplifying traditional color matching and printing processes and improving production efficiency and design flexibility.

[0018] 4. By synergistically selecting key parameters such as high and low temperature film thickness (0.4 mm), amount of phosphorescent powder added (30 parts), viscosity of each layer of slurry, and composite process temperature (150℃ lamination), the best balance was achieved between light transmittance, flexibility, mechanical strength, and phosphorescent performance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the high-transmittance semi-transparent luminous interlayer synthetic leather of the present invention.

[0020] Figure reference numerals: 1. Top layer, 2. Latex printing layer, 3. Luminous layer, 4. Base material bonding layer, 5. High and low temperature film, 6. Release paper. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see the appendix Figure 1 As shown, this invention provides a high-transparency semi-transparent luminescent laminated synthetic leather, comprising, from top to bottom, a surface layer 1, a latex printing layer 2, a luminescent layer 3, a base material bonding layer 4, and a high-low temperature film 5. The surface layer 1 and the luminescent layer 3 possess high transparency, allowing the colors of the pattern on the latex printing layer 2 to be vibrant and rich when viewed from the front. Simultaneously, light can partially penetrate the leather material, creating a unique semi-transparent, hazy texture.

[0023] The preparation method of high-transmittance semi-transparent luminous interlayer synthetic leather includes the following steps: (1) Apply the surface layer slurry to the release paper 6 and dry it to form the surface layer 1.

[0024] (2) A latex printing layer 2 is applied to the surface layer 1 and dried to form the latex printing layer 2. The printing pattern of the latex printing layer 2 can be any pattern. Latex printing is not limited in terms of pattern effect and can use any suitable style pattern.

[0025] (3) Apply the luminous layer 3 paste to the latex printing layer 2 and dry it to form the luminous layer 3.

[0026] (4) Apply the base material bonding layer 4 slurry to the luminous layer 3 and bake it until it is semi-dry to form the base material bonding layer 4.

[0027] (5) The semi-dry base material bonding layer 4 is laminated with the high and low temperature film 5 (substrate layer).

[0028] (6) The composite material is dried, peeled, cooled and rolled up to obtain a high-transparency semi-transparent luminous interlayer synthetic leather.

[0029] The high-transmittance semi-transparent luminescent laminated synthetic leather prepared by the method of this invention uses an in-film printing process to place the latex printing layer 2 between the surface layer 1 and the luminescent layer 3, thereby improving the durability and adhesion of the pattern. It realizes a sandwich structure between the pattern layer (latex printing layer 2) and the luminescent layer 3, so that the pattern layer presents rich colors during the day and a uniform luminescent effect at night. The overall structure has both high transmittance and semi-transparent visual effect, enhancing the product's aesthetics and recognizability.

[0030] The topcoat paste comprises the following components in parts by weight: 100 parts of first resin, 60±5 parts of DMF, and 20±5 parts of methyl ethyl ketone (MEK). The first resin has a solid content of 30.0±1.0%, a modulus of 65.0±2.0%, a tensile strength ≥45.0%, and an elongation at break ≥550. The viscosity of the topcoat paste is 2700±300 cps. The topcoat paste provides good transparency and gloss to the topcoat 1, providing a uniform base color for subsequent printing and the luminescent layer 3; its suitable viscosity ensures uniform coating and avoids sagging or uneven thickness.

[0031] When applying the topcoat slurry, apply it to the selected high-gloss plain-weave release film. Use a coating rod with 15 strips and control the coating amount at 150-160 g / m². 2 The drying temperature is controlled at 90-100℃, and the drying time is 3-5 minutes, so that the surface slurry can be completely volatilized until there is no irritating odor.

[0032] Latex printing layer 2 uses water-based latex ink and is printed using a latex flatbed printer. The printed pattern is in TIF format and is dried after printing at a temperature above 120℃. Latex printing layer 2 is environmentally friendly and non-toxic, with saturated colors and natural gradients, supporting complex patterns and three-dimensional effects. High-temperature drying after printing enhances ink adhesion and improves pattern durability.

[0033] The latex flatbed printer used is the HJ-6090L model from Zhengzhou Hongsheng Digital Technology Co., Ltd. This printer uses water-based latex ink, a water-based pigment ink independently developed using nano-pigment dispersion technology combined with inkjet printing technology. It features smooth printing, minimal line breakage, strong moisture retention, and excellent wet and dry rubbing fastness, both meeting or exceeding national standards. It is odorless and non-corrosive, making it beneficial for indoor environments and human health. It is suitable for printing on various media, adapting to different textures of leather, regardless of depth or fineness. The latex ink used has vibrant colors, high saturation, and a wide color gamut. The main components of the ink are ethylene glycol, 1,2-benzisothiazol-3-one, water-based acrylic resin, and deionized water, all of which are non-toxic and odorless. Specific performance parameters are as follows: ; Latex printing: After color matching of the pattern to be printed in AI software, set the format to PSD or PIF, then open it in PS software, create a spot color channel, save it as TIF, and finally adjust it in RIIN printing software before printing. Beforehand, the leather thickness must be tested, and the printhead height must be adjusted to approximately 1.85mm from the leather. The printing position and area must also be measured. After printing, place it in an oven for drying at a temperature above 120℃. After drying, the second latex printing layer is obtained.

[0034] The luminescent layer slurry comprises the following components in parts by weight: 100 parts of the first resin, 60±5 parts of DMF, 20±5 parts of methyl ethyl ketone (MEK), and 30±5 parts of luminescent powder. The viscosity of the luminescent layer slurry is 2800±300 cps. Adding 30±5 parts of luminescent powder results in a soft and long-lasting luminescent effect, enhancing the product's nighttime visual appeal without affecting the coating's transparency and adhesion. Its suitable viscosity ensures uniform coverage of the luminescent layer 3, preventing particle agglomeration or sedimentation. Preferably, the luminescent powder is strontium aluminate luminescent powder or a silicate-based long-lasting luminescent powder.

[0035] When applying the luminous layer 3, apply it to the obtained surface layer 1 using a 15-spindle coating rod, and control the coating amount to 150-160 g / m². 2 The drying temperature is controlled at 90-100℃, and the drying time is 4-5 minutes, so that the luminescent slurry can be completely volatilized until there is no irritating odor.

[0036] The base bonding layer slurry comprises the following components in parts by weight: 100 parts of the second resin, 10±2 parts of DMF, and 40±5 parts of methyl ethyl ketone (MEK). The viscosity of the base bonding layer slurry is 4500±500 cps. The base bonding layer 4 slurry provides excellent adhesion, ensuring a tight bond between each functional layer and the high / low temperature membrane 5. Its high viscosity makes it suitable for scraping, forming a uniform bonding layer and improving the overall structural strength of the product. The second resin has a solid content of 40.0±1.0%, a modulus of 50.0±2.0%, a tensile strength ≥40.0%, and an elongation at break ≥500.

[0037] When applying the base coat slurry, use a coating rod with 15 strips and control the coating amount to 150-160 g / m². 2 The drying temperature is controlled at 90-100℃, and the drying air volume is 160cm³. 3 Blow air evenly at a rate of / min until the material is nearly dry. When pressed with a finger, it should not feel sticky, thus obtaining the base material bonding layer 4.

[0038] The thickness of the high and low temperature film 5 is 0.4±0.05mm. This thickness is moderate, taking into account flexibility, wear resistance and semi-permeability; after being bonded to the base material bonding layer 4, the overall structure is stable and not easily deformed or delaminated.

[0039] The high and low temperature film 5 is a TPU film. TPU film has high and low temperature adaptability, enhancing the product's application scenarios.

[0040] Release paper 6 is a high-gloss plain weave release film. The high-gloss plain weave release film has good release performance, facilitates final peeling, does not damage the fabric layer, and also improves the surface gloss and smoothness of the surface layer 1, facilitating subsequent printing and coating operations and improving production efficiency.

[0041] In step (5), before the base material bonding layer 4 and the high and low temperature film 5 are laminated, the temperature of the laminating roller should be raised to 150°C in advance to ensure that the bonding layer and the substrate are fully fused and to improve the peel strength; the speed of the laminating roller is controlled at 2-3 m / s; the high and low temperature film 5 is placed above the laminating roller, and the release film coated with the base material bonding coating is placed below the laminating roller. After lamination, it is placed in a 10-meter, 90°C oven and dried under the condition of air supply of 300 rpm. The lamination speed and drying conditions are controlled to avoid bubbles, wrinkles or poor adhesion.

[0042] The beneficial technical effects of the synthetic leather obtained by the preparation method of the present invention will be further illustrated below through several examples and comparative examples. Example 1

[0043] This example provides a method for preparing highly transparent, semi-transparent, luminous interlayer synthetic leather, including the following steps: (1) A topcoat slurry is applied to a high-gloss plain release film and dried to form a topcoat. The topcoat slurry comprises the following components by weight: 100 parts of the first resin, 60 parts of DMF, and 20 parts of methyl ethyl ketone (MEK). The viscosity of the topcoat slurry is 2700±300 cps. When applying the topcoat to the fabric, a coating rod with 15 strips is used, and the coating amount is controlled at 150 g / m². 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the surface slurry can be completely volatilized until there is no irritating odor.

[0044] (2) Latex pattern printing is performed on the surface layer, and after drying, a latex printing layer is formed; the latex pattern printing uses water-based latex ink and is printed using a latex flatbed printer; the selected printing pattern is color-adjusted in AI software and then set to PSD format, then opened in PS software, a spot color channel is created and saved with the setting format TIF, and finally adjusted in RIIN printing software before printing. Here, the leather thickness must first be tested, and the nozzle height must be adjusted to about 1.85mm from the leather. The printing position and printing range must also be measured; after printing, it is placed in an oven for drying at a temperature above 120℃.

[0045] (3) Apply the luminescent layer paste to the latex printing layer and dry it to form the luminescent layer; the luminescent layer paste includes the following components by weight: 100 parts of the first resin, 60 parts of DMF, 20 parts of methyl ethyl ketone, and 30 parts of strontium aluminate luminescent powder, wherein the viscosity of the luminescent layer paste is 2800±300cps; when applying the luminescent layer, use a coating rod with 15 strips and control the coating amount to 150g / m 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the luminescent layer slurry can be completely volatilized until there is no irritating odor.

[0046] (4) Apply a base bonding layer slurry to the luminescent layer and bake it to a semi-dry state to form a base bonding layer; the base bonding layer slurry includes the following components by weight: 100 parts of second resin, 10 parts of DMF, and 40 parts of methyl ethyl ketone, wherein the viscosity of the base bonding layer slurry is 4500±500cps; the base bonding layer is applied by scraping, using 15 coating rods, and the coating amount is controlled at 150g / m 2 The drying temperature is controlled at 100℃, and the drying air volume is 160cm³. 3 Blow air evenly at a speed of / min until the material is nearly dry. When pressed with a finger, it should not feel sticky, thus obtaining the base material bonding layer.

[0047] (5) Lamination of the semi-dry base material bonding layer with the 0.4mm high and low temperature film; Before lamination of the base material bonding layer with the high and low temperature film, the temperature of the lamination roller should be raised to 150℃ in advance, and the speed of the lamination roller should be controlled at 2-3m / s; Place the high and low temperature film above the lamination roller, and place the release film coated with the base material bonding coating below the lamination roller. After lamination, put it into a 10-meter, 90℃ oven and dry it under the condition of air supply 300 rpm.

[0048] (6) The composite material is dried, peeled, cooled and rolled up to obtain a high-transparency semi-transparent luminous interlayer synthetic leather. Example 2

[0049] This example provides a method for preparing highly transparent, semi-transparent, luminous interlayer synthetic leather, including the following steps: (1) A topcoat slurry is applied to a high-gloss plain release film and dried to form a topcoat. The topcoat slurry comprises the following components by weight: 100 parts of the first resin, 60 parts of DMF, and 20 parts of methyl ethyl ketone (MEK). The viscosity of the topcoat slurry is 2700±300 cps. When applying the topcoat to the fabric, a coating rod with 15 strips is used, and the coating amount is controlled at 150 g / m². 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the surface slurry can be completely volatilized until there is no irritating odor.

[0050] (2) Latex pattern printing is performed on the surface layer, and after drying, a latex printing layer is formed; the latex pattern printing uses water-based latex ink and is printed using a latex flatbed printer; the selected printing pattern is color-adjusted in AI software and then set to PSD format, then opened in PS software, a spot color channel is created and saved with the setting format TIF, and finally adjusted in RIIN printing software before printing. Here, the leather thickness must first be tested, and the nozzle height must be adjusted to about 1.85mm from the leather. The printing position and printing range must also be measured; after printing, it is placed in an oven for drying at a temperature above 120℃.

[0051] (3) Apply the luminescent layer paste to the latex printing layer and dry it to form a luminescent layer; the luminescent layer paste includes the following components by weight: 100 parts of the first resin, 60 parts of DMF, 20 parts of methyl ethyl ketone, and 30 parts of silicate system long-lasting luminescent powder, wherein the viscosity of the luminescent layer paste is 2800±300cps; when applying the luminescent layer, use a coating rod with 15 strips and control the coating amount to 150g / m 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the luminescent layer slurry can be completely volatilized until there is no irritating odor.

[0052] (4) Apply a base bonding layer slurry to the luminescent layer and bake it to a semi-dry state to form a base bonding layer; the base bonding layer slurry includes the following components by weight: 100 parts of second resin, 10 parts of DMF, and 40 parts of methyl ethyl ketone, wherein the viscosity of the base bonding layer slurry is 4500±500cps; the base bonding layer is applied by scraping, using 15 coating rods, and the coating amount is controlled at 150g / m 2 The drying temperature is controlled at 100℃, and the drying air volume is 160cm³. 3 Blow air evenly at a speed of / min until the material is nearly dry. When pressed with a finger, it should not feel sticky, thus obtaining the base material bonding layer.

[0053] (5) Lamination of the semi-dry base material bonding layer with the 0.4mm high and low temperature film; Before lamination of the base material bonding layer with the high and low temperature film, the temperature of the lamination roller should be raised to 150℃ in advance, and the speed of the lamination roller should be controlled at 2-3m / s; Place the high and low temperature film above the lamination roller, and place the release film coated with the base material bonding coating below the lamination roller. After lamination, put it into a 10-meter, 90℃ oven and dry it under the condition of air supply 300 rpm.

[0054] (6) The composite material is dried, peeled, cooled and rolled up to obtain a high-transparency semi-transparent luminous interlayer synthetic leather.

[0055] Comparative Example 1 This example provides a method for preparing synthetic leather, including the following steps: (1) A topcoat slurry is applied to a high-gloss plain release film and dried to form a topcoat. The topcoat slurry comprises the following components by weight: 100 parts of microfiber special fabric resin, 60 parts of DMF, 20 parts of methyl ethyl ketone (MEK), and 15 parts of strontium aluminate luminescent powder. The viscosity of the topcoat slurry is 2700±300 cps. When applying the fabric coating, a coating rod with 15 strips is used, and the coating amount is controlled at 150 g / m². 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the surface slurry can be completely volatilized until there is no irritating odor.

[0056] (2) Preparation of intermediate layer slurry: The formulation of the intermediate layer slurry is the same as that of the top layer slurry, consisting of 100 parts of a special microfiber fabric resin, 60 parts of dimethylformamide, 20 parts of methyl ethyl ketone, and 15 parts of strontium aluminate luminescent powder. The viscosity is approximately 2700±300 cps. The solid content of the special microfiber fabric resin is 30.0±1.0%, the modulus is 60.0±2.0%, the tensile strength is ≥50.0%, and the elongation at break is ≥500%. When applying the intermediate layer slurry, 18 coating rods are used, and the coating amount is controlled at 180 g / m². 2The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the middle layer slurry can be completely volatilized until there is no irritating odor.

[0057] (3) Preparation of the base coat slurry: All components are proportioned according to the following weight ratios: 100 parts of microfiber base resin, 30 parts of DMF, 10 parts of methyl ethyl ketone (MEK), and 15 parts of colorant. The viscosity is approximately 8000-10000 cps. The microfiber base resin has a solid content of 40.0±1.0%, a modulus of 30.0±2.0%, a tensile strength ≥30.0%, and an elongation at break ≥500%. When applying the base coat slurry, 20 coating rods are used, and the coating amount is controlled at 210 g / m². 2 The bottom layer is pressed and bonded to a 0.4mm thick ordinary microfiber using a laminating roller. The laminating roller pressure is set to 0.5MPa, the drying temperature is controlled at 100℃, and the drying air volume is 160cm³. 3 The air is blown evenly at a speed of 6m / min, and the drying time is 10min. After the top, middle and bottom layers of slurry are completely dried, the material is cooled, peeled, cut and rolled up.

[0058] Comparative Example 2 This example provides a method for preparing synthetic leather, including the following steps: (1) A topcoat slurry is applied to a high-gloss plain release film and dried to form a topcoat. The topcoat slurry comprises the following components by weight: 100 parts of the first resin, 60 parts of DMF, and 20 parts of methyl ethyl ketone (MEK). The viscosity of the topcoat slurry is 2700±300 cps. When applying the topcoat to the fabric, a coating rod with 15 strips is used, and the coating amount is controlled at 150 g / m². 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the surface slurry can be completely volatilized until there is no irritating odor.

[0059] (2) Latex pattern printing is performed on the surface layer, and after drying, a latex printing layer is formed; the latex pattern printing uses water-based latex ink and is printed using a latex flatbed printer; the selected printing pattern is color-adjusted in AI software and then set to PSD format, then opened in PS software, a spot color channel is created and saved with the setting format TIF, and finally adjusted in RIIN printing software before printing. Here, the leather thickness must first be tested, and the nozzle height must be adjusted to about 1.85mm from the leather. The printing position and printing range must also be measured; after printing, it is placed in an oven for drying at a temperature above 120℃.

[0060] (3) Apply the luminescent layer paste to the latex printing layer and dry it to form the luminescent layer; the luminescent layer paste includes the following components by weight: 100 parts of the first resin, 60 parts of DMF, 20 parts of methyl ethyl ketone, and 30 parts of strontium aluminate luminescent powder, wherein the viscosity of the luminescent layer paste is 2800±300cps; when applying the luminescent layer, use a coating rod with 15 strips and control the coating amount to 150g / m 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the luminescent layer slurry can be completely volatilized until there is no irritating odor.

[0061] (4) Apply a base bonding layer slurry to the luminescent layer and bake it to a semi-dry state to form a base bonding layer; the base bonding layer slurry includes the following components by weight: 100 parts of second resin, 10 parts of DMF, and 40 parts of methyl ethyl ketone, wherein the viscosity of the base bonding layer slurry is 4500±500cps; the base bonding layer is applied by scraping, using 15 coating rods, and the coating amount is controlled at 150g / m 2 The drying temperature is controlled at 100℃, and the drying air volume is 160cm³. 3 Blow air evenly at a speed of / min until the material is nearly dry. When pressed with a finger, it should not feel sticky, thus obtaining the base material bonding layer.

[0062] (5) Lamination is performed between the semi-dry base material bonding layer and the 1.25mm ordinary microfiber base fabric. Before lamination between the base material bonding layer and the ordinary microfiber base fabric, the temperature of the lamination roller should be raised to 150℃ in advance, and the speed of the lamination roller should be controlled at 2-3m / s. The ordinary microfiber base fabric is placed above the lamination roller, and the release film coated with the base material bonding coating is placed below the lamination roller. After lamination, it is placed in a 10-meter, 90℃ oven and dried under the condition of air supply at 300 rpm.

[0063] (6) The composite material is dried, peeled, cooled and rolled up to obtain synthetic leather.

[0064] Comparative Example 3 This example provides a method for preparing synthetic leather, including the following steps: (1) A topcoat slurry is applied to a high-gloss plain release film and dried to form a topcoat. The topcoat slurry comprises the following components by weight: 100 parts of the first resin, 60 parts of DMF, and 20 parts of methyl ethyl ketone (MEK). The viscosity of the topcoat slurry is 2700±300 cps. When applying the topcoat to the fabric, a coating rod with 15 strips is used, and the coating amount is controlled at 150 g / m². 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the surface slurry can be completely volatilized until there is no irritating odor.

[0065] (2) Preparation of luminescent layer slurry: The luminescent layer slurry comprises the following components in parts by weight: 100 parts of first resin, 60 parts of DMF, 20 parts of methyl ethyl ketone, and 30 parts of strontium aluminate luminescent powder. The viscosity of the luminescent layer slurry is 2800±300 cps. When applying the luminescent layer by scraping, the number of coating rods is 15, and the coating amount is controlled at 150 g / m². 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the luminescent layer slurry can be completely volatilized until there is no irritating odor.

[0066] (3) Apply a base bonding layer slurry to the luminescent layer and bake it to a semi-dry state to form a base bonding layer; the base bonding layer slurry includes the following components by weight: 100 parts of the second resin, 10 parts of DMF, and 40 parts of methyl ethyl ketone, wherein the viscosity of the base bonding layer slurry is 4500±500cps; apply the base bonding layer by scraping, using 15 coating rods, and control the coating amount to 150g / m 2 The drying temperature is controlled at 100℃, and the drying air volume is 160cm³. 3 Blow air evenly at a speed of / min until the material is nearly dry. When pressed with a finger, it should not feel sticky, thus obtaining the base material bonding layer.

[0067] (4) Lamination is performed between the semi-dry base material bonding layer and the 0.4mm high and low temperature film. Before lamination between the base material bonding layer and the high and low temperature film, the temperature of the lamination roller should be raised to 150℃ in advance, and the speed of the lamination roller should be controlled at 2-3m / s. The high and low temperature film is placed above the lamination roller, and the release film coated with the base material bonding coating is placed below the lamination roller. After lamination, it is placed in a 10-meter, 90℃ oven and dried under the condition of air supply at 300 rpm. After it is completely dried, it is peeled off and rolled up to obtain a semi-transparent luminous high and low temperature film.

[0068] (5) Latex printing layer printing: After adjusting the colors of the selected pattern in AI software, set the format to PSD, then open it in PS software, create a spot color channel, save it in TIF format, and finally adjust it in RIIN printing software before printing. Here, the leather thickness must first be tested, and the nozzle height must be adjusted to about 1.85mm from the leather. The printing position and printing range must also be measured. After the semi-transparent luminous high and low temperature film is placed on the printing table, the pattern is printed. After printing, it is placed in an oven for drying. The oven temperature is set above 120℃. After drying, synthetic leather is obtained.

[0069] Comparative Example 4 This example provides a method for preparing synthetic leather, including the following steps: (1) A topcoat slurry is applied to a high-gloss plain release film and dried to form a topcoat. The topcoat slurry comprises the following components by weight: 100 parts of the first resin, 60 parts of DMF, and 20 parts of methyl ethyl ketone (MEK). The viscosity of the topcoat slurry is 2700±300 cps. When applying the topcoat to the fabric, a coating rod with 15 strips is used, and the coating amount is controlled at 150 g / m². 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the surface slurry can be completely volatilized until there is no irritating odor.

[0070] (2) Latex pattern printing is performed on the surface layer, and after drying, a latex printing layer is formed; the latex pattern printing uses water-based latex ink and is printed using a latex flatbed printer; the selected printing pattern is color-adjusted in AI software and then set to PSD format, then opened in PS software, a spot color channel is created and saved with the setting format TIF, and finally adjusted in RIIN printing software before printing. Here, the leather thickness must first be tested, and the nozzle height must be adjusted to about 1.85mm from the leather. The printing position and printing range must also be measured; after printing, it is placed in an oven for drying at a temperature above 120℃.

[0071] (3) Apply the luminescent layer paste to the latex printing layer and dry it to form the luminescent layer; the luminescent layer paste includes the following components by weight: 100 parts of the first resin, 60 parts of DMF, 20 parts of methyl ethyl ketone, and 30 parts of strontium aluminate luminescent powder, wherein the viscosity of the luminescent layer paste is 2800±300cps; when applying the luminescent layer, use a coating rod with 15 strips and control the coating amount to 150g / m 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the luminescent layer slurry can be completely volatilized until there is no irritating odor.

[0072] (4) Apply a base bonding layer slurry to the luminescent layer and bake it to a semi-dry state to form a base bonding layer; the base bonding layer slurry includes the following components by weight: 100 parts of second resin, 10 parts of DMF, and 40 parts of methyl ethyl ketone, wherein the viscosity of the base bonding layer slurry is 4500±500cps; the base bonding layer is applied by scraping, using 15 coating rods, and the coating amount is controlled at 150g / m 2 The drying temperature is controlled at 100℃, and the drying air volume is 160cm³. 3 Blow air evenly at a speed of / min until the material is nearly dry. When pressed with a finger, it should not feel sticky, thus obtaining the base material bonding layer.

[0073] (5) Lamination of the semi-dry base material bonding layer with the 0.1mm high and low temperature film; Before lamination of the base material bonding layer with the high and low temperature film, the temperature of the lamination roller should be raised to 150℃ in advance, and the speed of the lamination roller should be controlled at 2-3m / s; Place the high and low temperature film above the lamination roller, and place the release film coated with the base material bonding coating below the lamination roller. After lamination, put it into a 10-meter, 90℃ oven and dry it under the condition of air supply 300 rpm.

[0074] (6) The composite material is dried, peeled, cooled and rolled up to obtain synthetic leather.

[0075] Comparative Example 5 This example provides a method for preparing synthetic leather, including the following steps: (1) A topcoat slurry is applied to a high-gloss plain release film and dried to form a topcoat. The topcoat slurry comprises the following components by weight: 100 parts of the first resin, 60 parts of DMF, and 20 parts of methyl ethyl ketone (MEK). The viscosity of the topcoat slurry is 2700±300 cps. When applying the topcoat to the fabric, a coating rod with 15 strips is used, and the coating amount is controlled at 150 g / m². 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the surface slurry can be completely volatilized until there is no irritating odor.

[0076] (2) Latex pattern printing is performed on the surface layer, and after drying, a latex printing layer is formed; the latex pattern printing uses water-based latex ink and is printed using a latex flatbed printer; the selected printing pattern is color-adjusted in AI software and then set to PSD format, then opened in PS software, a spot color channel is created and saved with the setting format TIF, and finally adjusted in RIIN printing software before printing. Here, the leather thickness must first be tested, and the nozzle height must be adjusted to about 1.85mm from the leather. The printing position and printing range must also be measured; after printing, it is placed in an oven for drying at a temperature above 120℃.

[0077] (3) Apply the luminescent layer paste to the latex printing layer and dry it to form the luminescent layer; the luminescent layer paste includes the following components by weight: 100 parts of the first resin, 60 parts of DMF, 20 parts of methyl ethyl ketone, and 30 parts of strontium aluminate luminescent powder, wherein the viscosity of the luminescent layer paste is 2800±300cps; when applying the luminescent layer, use a coating rod with 15 strips and control the coating amount to 150g / m 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the luminescent layer slurry can be completely volatilized until there is no irritating odor.

[0078] (4) Apply a base bonding layer slurry to the luminescent layer and bake it to a semi-dry state to form a base bonding layer; the base bonding layer slurry includes the following components by weight: 100 parts of second resin, 10 parts of DMF, and 40 parts of methyl ethyl ketone, wherein the viscosity of the base bonding layer slurry is 4500±500cps; the base bonding layer is applied by scraping, using 15 coating rods, and the coating amount is controlled at 150g / m 2 The drying temperature is controlled at 100℃, and the drying air volume is 160cm³. 3 Blow air evenly at a speed of / min until the material is nearly dry. When pressed with a finger, it should not feel sticky, thus obtaining the base material bonding layer.

[0079] (5) Lamination of the semi-dry base material bonding layer with a 1mm high and low temperature film; Before lamination of the base material bonding layer with the high and low temperature film, the temperature of the lamination roller should be raised to 150℃ in advance, and the speed of the lamination roller should be controlled at 2-3m / s; Place the high and low temperature film above the lamination roller, and place the release film coated with the base material bonding coating below the lamination roller. After lamination, put it into a 10-meter, 90℃ oven and dry it under the condition of air supply 300 rpm.

[0080] (6) The composite material is dried, peeled, cooled and rolled up to obtain synthetic leather.

[0081] Comparative Example 6 This example provides a method for preparing synthetic leather, including the following steps: (1) A topcoat slurry is applied to a high-gloss plain release film and dried to form a topcoat. The topcoat slurry comprises the following components by weight: 100 parts of the first resin, 60 parts of DMF, and 20 parts of methyl ethyl ketone (MEK). The viscosity of the topcoat slurry is 2700±300 cps. When applying the topcoat to the fabric, a coating rod with 15 strips is used, and the coating amount is controlled at 150 g / m². 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the surface slurry can be completely volatilized until there is no irritating odor.

[0082] (2) Latex pattern printing is performed on the surface layer, and after drying, a latex printing layer is formed; the latex pattern printing uses water-based latex ink and is printed using a latex flatbed printer; the selected printing pattern is color-adjusted in AI software and then set to PSD format, then opened in PS software, a spot color channel is created and saved with the setting format TIF, and finally adjusted in RIIN printing software before printing. Here, the leather thickness must first be tested, and the nozzle height must be adjusted to about 1.85mm from the leather. The printing position and printing range must also be measured; after printing, it is placed in an oven for drying at a temperature above 120℃.

[0083] (3) Apply the luminescent layer paste to the latex printing layer and dry it to form the luminescent layer; the luminescent layer paste includes the following components by weight: 100 parts of the first resin, 60 parts of DMF, 20 parts of methyl ethyl ketone, and 15 parts of strontium aluminate luminescent powder, wherein the viscosity of the luminescent layer paste is 2800±300cps; when applying the luminescent layer, use 15 coating rods and control the coating amount to 150g / m 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the luminescent layer slurry can be completely volatilized until there is no irritating odor.

[0084] (4) Apply a base bonding layer slurry to the luminescent layer and bake it to a semi-dry state to form a base bonding layer; the base bonding layer slurry includes the following components by weight: 100 parts of second resin, 10 parts of DMF, and 40 parts of methyl ethyl ketone, wherein the viscosity of the base bonding layer slurry is 4500±500cps; the base bonding layer is applied by scraping, using 15 coating rods, and the coating amount is controlled at 150g / m 2 The drying temperature is controlled at 100℃, and the drying air volume is 160cm³. 3 Blow air evenly at a speed of / min until the material is nearly dry. When pressed with a finger, it should not feel sticky, thus obtaining the base material bonding layer.

[0085] (5) Lamination of the semi-dry base material bonding layer with the 0.4mm high and low temperature film; Before lamination of the base material bonding layer with the high and low temperature film, the temperature of the lamination roller should be raised to 150℃ in advance, and the speed of the lamination roller should be controlled at 2-3m / s; Place the high and low temperature film above the lamination roller, and place the release film coated with the base material bonding coating below the lamination roller. After lamination, put it into a 10-meter, 90℃ oven and dry it under the condition of air supply 300 rpm.

[0086] (6) The composite material is dried, peeled, cooled and rolled up to obtain synthetic leather.

[0087] Comparative Example 7 This example provides a method for preparing synthetic leather, including the following steps: (1) A topcoat slurry is applied to a high-gloss plain release film and dried to form a topcoat. The topcoat slurry comprises the following components by weight: 100 parts of the first resin, 60 parts of DMF, and 20 parts of methyl ethyl ketone (MEK). The viscosity of the topcoat slurry is 2700±300 cps. When applying the topcoat to the fabric, a coating rod with 15 strips is used, and the coating amount is controlled at 150 g / m². 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the surface slurry can be completely volatilized until there is no irritating odor.

[0088] (2) Latex pattern printing is performed on the surface layer, and a latex printing layer is formed after drying; the latex pattern printing uses traditional solvent-based PU printing ink (the main solvents are methyl ethyl ketone and DMF), and is printed using a latex flatbed printer; the selected printing pattern is color-adjusted in AI software and then set to PSD format, which is then opened in PS software, a spot color channel is created and saved in TIF format, and finally adjusted in RIIN printing software before printing. Here, the leather thickness must first be tested, and the nozzle height must be adjusted to about 1.85mm from the leather. The printing position and printing range must also be measured; after printing, it is placed in an oven for drying at a temperature above 120℃.

[0089] (3) Apply the luminescent layer paste to the latex printing layer and dry it to form the luminescent layer; the luminescent layer paste includes the following components by weight: 100 parts of the first resin, 60 parts of DMF, 20 parts of methyl ethyl ketone, and 30 parts of strontium aluminate luminescent powder, wherein the viscosity of the luminescent layer paste is 2800±300cps; when applying the luminescent layer, use a coating rod with 15 strips and control the coating amount to 150g / m 2 The machine speed is 7m / min, the drying temperature is controlled at 100℃, and the drying time is 5 minutes, so that the luminescent layer slurry can be completely volatilized until there is no irritating odor.

[0090] (4) Apply a base bonding layer slurry to the luminescent layer and bake it to a semi-dry state to form a base bonding layer; the base bonding layer slurry includes the following components by weight: 100 parts of second resin, 10 parts of DMF, and 40 parts of methyl ethyl ketone, wherein the viscosity of the base bonding layer slurry is 4500±500cps; the base bonding layer is applied by scraping, using 15 coating rods, and the coating amount is controlled at 150g / m 2 The drying temperature is controlled at 100℃, and the drying air volume is 160cm³. 3 Blow air evenly at a speed of / min until the material is nearly dry. When pressed with a finger, it should not feel sticky, thus obtaining the base material bonding layer.

[0091] (5) Lamination of the semi-dry base material bonding layer with the 0.4mm high and low temperature film; Before lamination of the base material bonding layer with the high and low temperature film, the temperature of the lamination roller should be raised to 150℃ in advance, and the speed of the lamination roller should be controlled at 2-3m / s; Place the high and low temperature film above the lamination roller, and place the release film coated with the base material bonding coating below the lamination roller. After lamination, put it into a 10-meter, 90℃ oven and dry it under the condition of air supply 300 rpm.

[0092] (6) The composite material is dried, peeled, cooled and rolled up to obtain synthetic leather.

[0093] Table 1. Apparent and environmental performance parameters of synthetic leather obtained in the examples and comparative examples. ; Note: Light transmittance and haze are key optical indicators for "high light transmittance" and "semi-transparent" visual effects. Haze was tested using a haze meter. Nighttime luminescence testing was conducted using a luminance meter in a dark room, with luminance values ​​recorded every 10 minutes until the luminance dropped to 0.32 mcd / m² (the human eye's visible threshold). Yellowing resistance testing was measured using a colorimeter.

[0094] Table 2. Physical property parameters of synthetic leather obtained in the examples and comparative examples. ; Note: The Taber abrasion test uses an H22 abrasive wheel to observe whether the surface is damaged and whether the luminous layer has peeled off, and photos can be taken for recording. The peel strength test uses the ASTM D903 standard, which directly reflects the bonding strength between the layers of the sandwich structure (especially the latex printing layer and the luminous layer).

[0095] Based on the test data in Tables 1 and 2, a comprehensive comparative analysis of the synthetic leather obtained from the embodiments of the present invention and the comparative examples yields the following clear conclusions: 1. Embodiments 1 and 2 of the present invention achieve "high light transmittance", "semi-transparent visual effect" and "long-lasting luminescence", with light transmittance reaching 72% and 70% respectively, and haze of only 15% and 16%, which are significantly better than the traditional luminescent synthetic leather of Comparative Example 1 (light transmittance 40%, haze 60%) and the traditional luminescent synthetic leather of Comparative Example 2 (light transmittance 45%, haze 55%). This proves that using a high-low temperature film (TPU) of a specific thickness (0.4 mm) is the key substrate for obtaining excellent optical performance.

[0096] 2. The peel strength of Example 1 is as high as 45N / 25mm, which is much higher than that of Comparative Example 3 (25N / 25mm) with an external latex printing layer. This directly proves that the in-film printing process of placing the latex printing layer between the surface layer and the luminous layer can greatly improve the interlayer adhesion and make the interlayer bond stronger. The Taber abrasion resistance test of Examples 1 and 2 showed no damage and no luminous layer peeling off. The dry / wet rubbing color fastness both reached level 4 or above, which is comprehensively better than the traditional structure (comparative Example 1 luminous layer peeling off, wet rubbing unqualified) and external printing (comparative Example 3 wet rubbing unqualified). Comparative Example 1 did not use latex printing and added luminescent powder to the top and middle layers, using ordinary microfiber for lamination. The resulting synthetic leather properties were as follows: Taber abrasion resistance: 400 revolutions (no damage, luminescent layer peeling off), dry rubbing passed, wet rubbing failed, luminescence duration 3 hours; the lack of latex printing resulted in poor appearance; directly adding luminescent powder to the top and middle layers and scraping it off resulted in longer luminescence duration, but it wore off during the abrasion resistance test; using ordinary microfiber lamination did not achieve a semi-transparent effect, failing to meet design requirements. Comparative Example 3 used an external printing process to obtain the following synthetic leather properties: Taber abrasion resistance: 400 revolutions (no damage, no luminescent layer peeling off), rubbing color fastness: both dry and wet rubbing failed, luminescence duration 1.5 hours; due to the use of external printing, the rubbing color fastness test results were unsatisfactory, failing to meet design requirements.

[0097] 3. Examples 1 and 2 maintain high light transmittance while exhibiting excellent bending fatigue performance (>100,000 cycles). However, changing the substrate thickness (too thin in Comparative Example 4 and too thick in Comparative Example 5) leads to a significant decrease in wear resistance, bending fatigue, or light transmittance, verifying the optimal balance between flexibility, strength, and light transmittance of a 0.4 mm thick high and low temperature film.

[0098] 4. Example 1 used 30 parts of luminescent powder, achieving a luminescence duration of 1.5 hours. However, in Comparative Example 6, the amount was halved to 15 parts, resulting in a duration of only 1.0 hour. Therefore, the luminescence duration was insufficient and did not meet design requirements, confirming the necessity of this dosage for ensuring effective luminescence performance. Example 2 used silicate long-lasting luminescent powder under the same structure, increasing the luminescence duration to 2.6 hours, while maintaining comparable performance to Example 1. This demonstrates the good functional material compatibility and upgrade potential of the present invention. The examples used water-based latex ink, exhibiting extremely low VOC emissions and good yellowing resistance (ΔE approximately 2.5). In contrast, Comparative Example 7, using traditional solvent-based ink, not only had high VOC emissions and drastically deteriorated yellowing resistance (ΔE reaching 5.5), but also exhibited low peel strength and easy detachment of the printed layer. This strongly demonstrates the crucial contribution of the water-based environmentally friendly system to the long-term durability and environmental friendliness of the product.

[0099] 5. In summary, the method for preparing high-transmittance semi-transparent luminescent laminated synthetic leather provided by this invention, through the organic combination of specific laminated structure design, in-film printing process, selection of a 0.4mm thick high-low temperature film, 30 parts of luminescent powder, and a water-based environmentally friendly printing system, successfully produces a new type of synthetic leather that combines high-transmittance semi-transparent visual effects, long-lasting and uniform luminescence, excellent physical and mechanical properties, and outstanding environmental characteristics. This not only endows synthetic leather products with rich and vibrant colors but also creates a distinct and three-dimensional visual effect. Furthermore, the innovative integration of luminescent elements further enhances the product's visual appeal and recognizability. In addition, the synthetic leather produced by this process exhibits excellent abrasion resistance and rubbing fastness, demonstrating outstanding practical performance. It is worth mentioning that the printing process uses water-based environmentally friendly latex ink, which is non-toxic and odorless throughout the entire process, fully complying with national environmental protection policies and the concept of green development, thus combining practicality and environmental value.

[0100] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a high-transmittance, semi-transparent, luminous interlayer synthetic leather, characterized in that: Includes the following steps: (1) Apply the surface layer slurry to the release paper and dry it to form the surface layer; (2) Print a latex pattern on the surface layer and dry it to form a latex printing layer; (3) Apply the luminescent layer paste to the latex printing layer and dry it to form a luminescent layer; the luminescent layer paste includes the following components in parts by weight: 100 parts of first resin, 60±5 parts of DMF, 20±5 parts of methyl ethyl ketone, and 30±5 parts of luminescent powder, wherein the viscosity of the luminescent layer paste is 2800±300cps. (4) Apply the base material bonding layer slurry to the luminescent layer and bake it until it is semi-dry to form the base material bonding layer; (5) The semi-dry base material bonding layer is laminated with the high and low temperature film; (6) The composite material is dried, peeled, cooled and rolled up to obtain a high-transparency semi-transparent luminous interlayer synthetic leather.

2. The method for preparing high-transmittance semi-transparent luminous interlayer synthetic leather according to claim 1, characterized in that: The surface layer slurry comprises the following components in parts by weight: 100 parts of the first resin DMF 60±5 parts 20±5 parts of methyl ethyl ketone (MEK) The viscosity of the surface slurry is 2700±300cps.

3. The method for preparing high-transmittance semi-transparent luminous interlayer synthetic leather according to claim 1, characterized in that: Latex pattern printing uses water-based latex ink and is printed using a latex flatbed printer. The printed pattern format is TIF. After printing, the pattern is dried at a temperature above 120℃.

4. The method for preparing high-transmittance semi-transparent luminous laminated synthetic leather according to claim 1, characterized in that: The base bonding layer slurry comprises the following components in parts by weight: 100 parts of the second resin DMF 10±2 parts 40±5 parts of methyl ethyl ketone (MEK) The viscosity of the base material bonding layer slurry is 4500±500cps.

5. The method for preparing high-transmittance semi-transparent luminous interlayer synthetic leather according to claim 1, characterized in that: The thickness of the high and low temperature film is 0.4±0.05mm.

6. The method for preparing high-transmittance semi-transparent luminous interlayer synthetic leather according to claim 5, characterized in that: The high and low temperature film is a TPU film.

7. The method for preparing high-transmittance semi-transparent luminous laminated synthetic leather according to claim 1, characterized in that: The release paper is a high-gloss, plain-textured release film.

8. The method for preparing high-transmittance semi-transparent luminous laminated synthetic leather according to claim 1, characterized in that: In step (5), before the base material bonding layer and the high and low temperature film are laminated, the temperature of the laminating roller should be raised to 150°C in advance, and the speed of the laminating roller should be controlled at 2-3 m / s. The high and low temperature film is placed above the laminating roller, and the release film coated with the base material bonding coating is placed below the laminating roller. After lamination, it is placed in a 10-meter, 90°C oven and dried under the condition of air supply at 300 rpm.

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