High-comfort wrinkle-free microfiber synthetic leather

Abstract

The utility model provides a kind of high comfort no-wrinkle microfiber synthetic leather, including from top to bottom sequentially compounded release paper, surface sizing layer, middle layer sizing layer, bottom sizing layer, pure TPU layer, PUR resin layer, dry method resin base material layer and microfiber layer;The pure TPU layer is adhered to the surface of dry method resin base material layer by PUR resin layer.The high comfort no-wrinkle microfiber synthetic leather of the utility model has no-wrinkle performance while ensuring wearing comfort.

Description

Technical Field

[0001] This utility model relates to the field of synthetic leather technology, specifically to a highly comfortable, wrinkle-free microfiber synthetic leather. Background Technology

[0002] In traditional synthetic leather manufacturing, mirror-finish leather (high-gloss surface) often suffers from problems such as orange peel texture and wrinkles due to substrate shrinkage or bending, affecting the appearance quality of high-end footwear (such as dress shoes and fashion sneakers). Current mainstream solutions have the following drawbacks:

[0003] 1. Although traditional ordinary microfiber synthetic leather achieves high gloss through coating, it has extremely poor folding resistance, is prone to irreversible wrinkles after dynamic bending, and has insufficient surface abrasion resistance.

[0004] 2. Traditional hot melt adhesive TPU is directly laminated with microfiber semi-finished products to prepare synthetic leather. The TPU is melted and bonded by high temperature and high pressure (200-220°C), which leads to insufficient wrinkle resistance (irreversible wrinkles are easily generated after dynamic bending), poor composite strength and poor interlayer peeling performance (the interface between hot melt adhesive TPU and microfiber is not firmly bonded), and the thermal deformation of hot melt adhesive TPU affects the smoothness.

[0005] 3. Pure PTU directly laminated with microfiber semi-finished products has problems such as poor wrinkle resistance and weak adhesion.

[0006] The aforementioned issues prevent mirror-finish leather from meeting high physical property requirements in scenarios such as the bending of athletic shoes and long-term use in automotive interiors. Therefore, this case involved in-depth research into these issues. Summary of the Invention

[0007] The present invention aims to solve the technical problems of interlayer peeling and poor wrinkle resistance in traditional synthetic leather, and provides a highly comfortable wrinkle-free microfiber synthetic leather that is wrinkle-free while ensuring wearing comfort.

[0008] This invention is achieved as follows: a highly comfortable, wrinkle-free microfiber synthetic leather, comprising, from top to bottom, a top layer of slurry, a middle layer of slurry, a bottom layer of slurry, a pure TPU layer, a PUR resin layer, a dry resin base layer, and a microfiber layer; the pure TPU layer is bonded to the surface of the dry resin base layer through the PUR resin layer.

[0009] Furthermore, the pure TPU layer is a matte pure TPU layer with a thickness of 0.3 mm.

[0010] Furthermore, the thickness of the PUR resin layer is 0.01-0.03 mm.

[0011] Furthermore, the thickness of the dry resin substrate layer is 0.05-0.10 mm.

[0012] Furthermore, the dry resin base layer is made by mixing 100 parts of medium base resin, 60 parts of dimethylformamide, and 20 parts of methyl ethyl ketone.

[0013] Furthermore, the surface slurry layer is made by mixing 100 parts of a first polyurethane resin, 60 parts of dimethylformamide, 20 parts of butanone, and 8-10 parts of color paste.

[0014] Furthermore, the intermediate slurry layer is made by mixing 100 parts of second polyurethane resin, 60 parts of dimethylformamide, 20 parts of methyl ethyl ketone, and 8-10 parts of color paste.

[0015] Furthermore, the bottom slurry layer is made by mixing 100 parts of third polyurethane resin, 10 parts of dimethylformamide, 40 parts of methyl ethyl ketone, and 5-10 parts of color paste.

[0016] Furthermore, release paper is adhered to the surface slurry layer.

[0017] This invention relates to a highly comfortable, wrinkle-free microfiber synthetic leather, comprising a layered structure from top to bottom: release paper provides a release surface; a top and middle slurry layer provides abrasion resistance and leveling properties; a bottom slurry layer enhances the softness and fit of the synthetic leather; a pure TPU layer provides wrinkle resistance and support; a PUR resin layer bonds the pure TPU layer to the dry resin base layer, and the double-layer adhesive layer of the PUR resin layer and the dry resin base layer eliminates interfacial stress; the dry resin base layer is used to penetrate and bond the microfiber layer, which uses a microfiber nonwoven fabric substrate. This highly comfortable, wrinkle-free microfiber synthetic leather exhibits a dynamic fold resistance of up to 150,000 cycles without creases, making it suitable for manufacturing mirror-finish shoe leather, specialty shoes, table tennis shoes, cycling shoes, or automotive interior materials. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the wrinkle-free microfiber synthetic leather layer in this utility model.

[0020] Figure reference numerals: 1. Release paper, 2. Top layer slurry layer, 3. Middle layer slurry layer, 4. Bottom layer slurry layer, 5. Pure TPU layer, 6. PUR resin layer, 7. Dry resin base layer, 8. Microfiber layer. Detailed Implementation

[0021] To better understand the technical solution of this utility model, the technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Please see Figure 1As shown, this utility model provides a highly comfortable, wrinkle-free microfiber synthetic leather, comprising, from top to bottom, a top layer slurry layer 2, a middle layer slurry layer 3, a bottom layer slurry layer 4, a pure TPU layer 5, a PUR resin layer 6, a dry resin base layer 7, and a microfiber layer 8; the pure TPU layer 5 is bonded to the surface of the dry resin base layer 7 via the PUR resin layer 6. Release paper 1 is laminated onto the top layer slurry layer 2.

[0023] This invention relates to a high-comfort, wrinkle-free microfiber synthetic leather, comprising an eight-layer structure from top to bottom. Release paper 1 provides the release surface; top and middle slurry layers 2 and 3 provide abrasion resistance and leveling properties; bottom slurry layer 4 enhances the softness and fit of the synthetic leather; pure TPU layer 5 provides wrinkle resistance and support; PUR resin layer 6 bonds the pure TPU layer 5 to the dry resin base layer 7, and the double-layer adhesive layer of PUR resin layer 6 and dry resin base layer 7 eliminates interfacial stress; dry resin base layer 7 is used to penetrate and bond the microfiber layer 8, which uses a microfiber nonwoven fabric substrate. This invention's high-comfort, wrinkle-free microfiber synthetic leather exhibits a dynamic fold resistance of up to 150,000 cycles without creases, making it suitable for manufacturing mirror-finish shoe leather, specialty shoes, table tennis shoes, cycling shoes, or automotive interiors.

[0024] In this invention, the pure TPU layer 5 is a matte pure TPU layer with a thickness of 0.3mm. The matte finish prevents light scattering. The thickness of the matte pure TPU layer 5 is limited to 0.3mm; too thin (0.1mm) results in insufficient flatness, while too thick increases costs. Matte pure TPU is also easier to keep the bonding surface clean than glossy TPU, preventing dust from affecting the lamination effect.

[0025] In this invention, the thickness of the PUR resin layer 6 is 0.01-0.03 mm. The thickness of the dry resin base layer is 0.05-0.10 mm. The PUR resin layer and the dry resin base layer balance the adhesive strength and flexibility.

[0026] In this invention, the dry resin base layer 7 is made by mixing 100 parts of medium base resin, 60 parts of dimethylformamide, and 20 parts of butanone.

[0027] In this invention, the surface slurry layer 2 is prepared by mixing 100 parts of a first polyurethane resin, 60 parts of dimethylformamide, 20 parts of methyl ethyl ketone (MEK), and 8-10 parts of color paste. After mixing the first polyurethane resin, dimethylformamide, MEK, and color paste, a surface slurry with a viscosity of 2000 cps is obtained. A layer of this surface slurry is then coated onto the surface of the release paper, with the coating amount controlled at 160 g / m². 2 The drying temperature is controlled at 90℃, and the drying time is 4 minutes; the first polyurethane resin has a solid content of 30% and a modulus of 100 kg / cm³. 2 .

[0028] In this invention, the intermediate slurry layer 3 is prepared by mixing 100 parts of a second polyurethane resin, 60 parts of dimethylformamide, 20 parts of methyl ethyl ketone (MEK), and 8-10 parts of colorant. After mixing the second polyurethane resin, dimethylformamide, MEK, and colorant, an intermediate slurry with a viscosity of 2000 cps is obtained. A layer of the intermediate slurry layer is then coated onto the top slurry layer, with the coating amount controlled at 160 g / m². 2 The drying temperature is controlled at 90℃, and the drying time is 4 minutes; the second polyurethane resin has a solid content of 30% and a modulus of 100 kg / cm³. 2 .

[0029] The top and middle layers of the slurry use high-modulus polyurethane resin. This type of resin has strong intermolecular forces, and its rigid molecules provide good wear resistance. It also has excellent processability, good leveling properties, soft feel, good non-stick properties, strong hydrolysis resistance, good flexural resistance, comfortable and smooth surface feel, and good light resistance.

[0030] In this invention, the bottom slurry layer 4 is prepared by mixing 100 parts of third polyurethane resin, 10 parts of dimethylformamide, 40 parts of methyl ethyl ketone (MEK), and 5-10 parts of color paste. After mixing the third polyurethane resin, dimethylformamide, MEK, and color paste, a bottom slurry with a viscosity of 6000 cps is obtained. A layer of the bottom slurry layer is then coated onto the middle slurry layer, with the coating amount controlled at 160 g / m². 2 The resin is dried to 90% semi-dry under conditions of 10 meters, 120°C oven, and 500 rpm airflow; the third polyurethane resin has a solid content of 45% and a modulus of 15-25 kg / cm³. 2 The base layer uses high-solids, low-modulus polyurethane resin, which makes synthetic leather products softer and more comfortable to the touch, has good solvent resistance, good compatibility with pigments, and is suitable for TPU products.

[0031] After the bottom slurry layer 4 is bonded to the pure TPU layer 5, it is dried in a 40-meter oven at a segmented heating rate of 90℃, 100℃, 110℃, 120℃, 120℃, 120℃, 120℃, and 120℃. The conveyor speed is set to 6-7m / min. After being rolled up together with the release paper 1, it is placed at a constant temperature of 70℃ for 20-24 hours to mature. After peeling off the release paper 1, wrinkle-free microfiber synthetic leather is obtained.

[0032] This invention relates to a highly comfortable, wrinkle-free microfiber synthetic leather, which is made by combining microfiber materials with TPU materials and then laminating them with PU dry-process paste. This synthetic leather product has the following outstanding advantages:

[0033] 1. Innovative process: 0.3mm matte pure TPU is combined with microfiber substrate through a solvent-free composite process (dry base resin + PUR resin), which retains the softness of microfiber and the original softness of TPU to ensure wearing comfort; at the same time, it significantly improves the surface smoothness and wrinkle resistance of synthetic leather, with a dynamic folding resistance of up to 150,000 times without creases, far exceeding ordinary microfiber synthetic leather.

[0034] 2. Performance advantages: High flatness, strong wrinkle resistance, good elasticity and recovery, excellent dynamic folding resistance, and realistic leather texture, making it particularly suitable for deep processing techniques such as flower embossing and floral embroidery.

[0035] 3. Application areas: Suitable for high-requirement scenarios such as mirrored shoe leather, special shoes, table tennis shoes, cycling shoes, and automotive interiors, and can replace traditional synthetic leather.

[0036] 4. Core Breakthrough: In mirror-finish shoe leather applications, the smoothness of the pure TPU layer 5 allows the product to maintain uniform light reflection under spotlights, completely avoiding the orange peel texture and wrinkles that are prone to occur with traditional materials.

[0037] 5. Overall Value: While ensuring wrinkle resistance, it also takes into account wearing comfort, which can not only improve the texture of synthetic leather products, but also reduce material and labor costs, while meeting the dual needs of the high-end market for the texture and functionality of synthetic leather products.

[0038] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A highly comfortable, wrinkle-free microfiber synthetic leather, characterized in that: It includes, from top to bottom, a top layer of slurry, a middle layer of slurry, a bottom layer of slurry, a pure TPU layer, a PUR resin layer, a dry resin base layer, and a microfiber layer; the pure TPU layer is bonded to the surface of the dry resin base layer through the PUR resin layer.

2. The high-comfort, wrinkle-free microfiber synthetic leather as described in claim 1, characterized in that: The pure TPU layer is a matte pure TPU layer with a thickness of 0.3mm.

3. The high-comfort, wrinkle-free microfiber synthetic leather as described in claim 2, characterized in that: The thickness of the PUR resin layer is 0.01-0.03 mm.

4. The high-comfort, wrinkle-free microfiber synthetic leather as described in claim 3, characterized in that: The thickness of the dry resin substrate layer is 0.05-0.10 mm.

5. The high-comfort, wrinkle-free microfiber synthetic leather as described in any one of claims 1-4, characterized in that: Release paper is adhered to the surface slurry layer.

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