Perforated color-permeable PU (polyurethane) leather for automotive trim and preparation method of perforated color-permeable PU leather

Abstract

The invention relates to the field of preparation of automotive interior materials, and particularly discloses perforated color-permeable PU leather for automotive interiors and a preparation method of the perforated color-permeable PU leather. The invention relates to a perforated and color-permeable PU (Poly Urethane) leather for an automotive trim, which sequentially comprises a PU leather color layer, a PU leather foaming layer and a base cloth layer from top to bottom, the PU leather foaming layer is prepared from the following raw materials in parts by weight: 50-80 parts of polyether polyurethane, 20-40 parts of filler, 0.5-1 part of foaming pigment and 0.5-2 parts of auxiliaries. The PU leather color layer and the base cloth layer are compounded by utilizing the bonding performance of the PU leather foaming layer in the foaming forming process, and the compounding bonding strength is high and cannot be achieved by adopting a bonding agent, so that the PU leather color layer and the base cloth layer are firmly bonded, the phenomenon that glue penetrates through holes due to the adoption of glue traditionally can be avoided, and the service life of the PU leather color layer and the base cloth layer is prolonged. And the problem that the PU perforated leather is not firmly bonded with the color-permeable base cloth so that the PU perforated leather falls off is solved.

Description

Technical Field

[0001] The present application relates to the field of preparation of automobile interior materials, and more specifically, to a perforated, color-transparent PU leather for automobile interior and a preparation method thereof. Background Art

[0002] PU leather has gradually become the first choice for car interiors with its comfortable and soft imitation leather feel. The thickness of interior PU leather is generally 0.9-1.2mm. Due to its comfortable characteristics, the application of interior decoration has gradually diversified, especially the requirements of perforated color. However, if the PU leather needs to meet the color permeability requirements after perforation, it is necessary to attach a layer of permeable base fabric after the PU is perforated, and glue is needed to attach the base fabric. As a result, although the PU leather holes are permeable after perforation, there are problems such as glue seeping through the holes and the poor adhesion between the PU perforated leather and the permeable base fabric, which needs to be solved urgently. Summary of the invention

[0003] In order to improve the bonding strength between PU perforated leather and transparent base fabric, the present application provides a perforated transparent PU leather for automobile interior and a preparation method thereof.

[0004] In the first aspect, the present application provides a perforated transparent PU leather for automobile interior, which adopts the following technical scheme: a perforated transparent PU leather for automobile interior, which comprises, from top to bottom, a PU leather color layer, a PU leather foaming layer and a base fabric layer; the PU leather foaming layer is made of the following raw materials in parts by weight: 50-80 parts of polyether polyurethane, 20-40 parts of filler, 0.5-1 part of foaming colorant and 0.5-2 parts of additives.

[0005] By adopting the above technical scheme, the PU leather color layer and the base fabric layer are compounded by utilizing the bonding properties of the PU leather foaming layer during the foaming molding process. The bonding strength of this composite is high, which cannot be achieved by using an adhesive, so that the PU leather color layer and the base fabric layer are firmly bonded, and the problem of glue seeping through the holes caused by the traditional use of glue and the problem of PU perforated leather falling off due to weak bonding with the color-transparent base fabric can be avoided. The production cost is reduced, the weather resistance is good, the product quality is high, and the production efficiency is high. The factory production has high quality and low price, energy saving and environmental protection, and simple and quick construction.

[0006] In a specific embodiment, the polyether polyurethane comprises the following raw materials in parts by weight: 2-20 parts of isocyanate-terminated polyurethane prepolymer, 5-15 parts of hydroxyl-terminated polyurethane prepolymer, 2-10 parts of polyacrylic acid and 100 parts of solvent.

[0007] By adopting the above technical scheme, the introduction of adhesive polyacrylic acid into the polyether polyurethane can improve the adhesiveness of the polyether polyurethane; at the same time, the introduction of hydroxyl-terminated polyurethane prepolymer can effectively slow down the skinning speed of the polyether polyurethane, the solidification speed is fast, and the pore structure is a vertically long structure, so that the obtained PU leather foaming layer has good adhesiveness and small peel strength attenuation.

[0008] In a specific embodiment, the preparation method of the polyether polyurethane comprises the following steps: The diisocyanate, polyether diol and monoglyceride of fatty acid are mixed and reacted in the presence of a solvent to obtain a hydroxyl-terminated polyurethane prepolymer; The diisocyanate, the polyether diol and the crosslinking agent are mixed and reacted in the presence of a solvent to obtain an isocyanate-terminated polyurethane prepolymer; Dissolve polyacrylic acid in an organic solvent to obtain a polyacrylic acid solution; add a hydroxyl-terminated prepolymer to obtain a polyacrylic acid-polyurethane graft copolymerization solution; add an isocyanate-terminated polyurethane prepolymer to the polyacrylic acid-polyurethane graft copolymerization solution, react at 30-90° C. for 4-10 hours, and obtain a polyether polyurethane.

[0009] By adopting the above technical scheme, the preparation method is simple, and the prepared polyether polyurethane has both the adhesiveness of polyacrylic acid and the high elasticity of polyurethane, so that the PU leather foaming layer firmly bonds the PU leather color layer and the base fabric layer together to form a whole as an automobile interior leather, so as to meet the requirements for soft and comfortable touch of interior materials.

[0010] In a specific embodiment, the diisocyanate is one or more of isophorone diisocyanate, 1,5-naphthalene diisocyanate, diphenylmethane diisocyanate, and hexamethylene diisocyanate; the polyether diol is one or more of polytetrahydrofuran, polyether diol N210, polyethylene glycol, and polypropylene glycol; the monoglyceride is one or more of palmitic acid glyceryl, monolauric acid glyceryl, monostearic acid glyceryl, and monooleic acid glyceryl; the cross-linking agent is one or more of azobisisobutyronitrile, azobisisoheptylnitrile, dimethyl azobisisobutyrate, benzoyl peroxide, tert-butyl peroxide, methyl ethyl ketone peroxide, and ammonium persulfate; and the organic solvent is one or more of N-methylpyrrolidone, N,N-dimethylformamide, isopropanol, and ethanol.

[0011] In a specific embodiment, the raw materials of the PU leather foaming layer further include 1-5 parts by weight of calcium pyrophosphate.

[0012] By adopting the above technical solution, calcium pyrophosphate can improve the surface energy and surface activity of polyether polyurethane, making the adhesion between layers stronger and not easy to peel off.

[0013] In a specific embodiment, the filler is one or more of nano-calcium carbonate, nano-titanium dioxide, nano-silicon dioxide, and nano-zinc dioxide, and the particle size of the filler is ≤200 nm.

[0014] By adopting the above technical solution, adding nano fillers can improve the wear resistance of PU foam leather.

[0015] In a specific embodiment, the auxiliary agent is one or more of a stabilizer, an antioxidant, and a flame retardant.

[0016] By adopting the above technical solution and adding appropriate amounts of different types of additives, automobile interior leather that meets different requirements can be obtained.

[0017] In a specific embodiment, the solvent is N,N-dimethylformamide and / or dimethylacetamide.

[0018] In a specific embodiment, the surface of the PU leather color layer is coated with a water-based modified acrylic polyurethane finishing agent to form a surface coating.

[0019] By adopting the above technical scheme, the water-based polyurethane finishing agent has the advantages of being environmentally friendly, non-toxic, and pollution-free, and acrylic acid and polyurethane molecules react chemically, and polyurethane and acrylate achieve complementary performance advantages. The obtained water-based modified acrylic polyurethane finishing agent has the excellent properties of polyurethane and acrylate, and has the characteristics of good gloss, wear resistance, corrosion resistance, good weather resistance, water resistance and good mechanical properties. At the same time, the use of the water-based modified acrylic polyurethane finishing agent in this application can improve the bonding with the PU leather color layer.

[0020] In a second aspect, the present application provides a method for preparing perforated color-transparent PU leather for automobile interior, which adopts the following technical solution: A method for preparing perforated color-transparent PU leather for automobile interior decoration comprises the following steps: Mixing and extruding corresponding weights of PU leather foaming layer raw materials to form PU leather foaming layer slurry; Through the release paper coating method, the PU leather foaming layer slurry is bonded to the PU leather color layer and the base fabric layer to make PU leather; The PU leather is punched through with a cone to form a perforated, color-transparent PU leather for automotive interiors.

[0021] In a specific embodiment, a method for preparing a perforated color-transparent PU leather for automobile interior decoration comprises the following steps: Mixing and extruding corresponding weights of PU leather foaming layer raw materials to form PU leather foaming layer slurry; Through the release paper coating method, the PU leather foaming layer slurry is used to bond the PU leather color layer and the base fabric layer to make a PU leather semi-finished product; the water-based modified acrylic polyurethane coating agent is coated on the surface of the PU leather semi-finished product to make PU leather; The PU leather is punched through with a cone-shaped hole to form a perforated, color-transparent PU leather for automotive interiors.

[0022] By adopting the above technical scheme and the conical punching process, the PU leather is punched to form a funnel-shaped punching effect by the color layer, the foaming layer and the base fabric layer, thereby highlighting the color contrast of the PU leather. At the same time, the preparation method is simple and controllable with good repeatability. The prepared material has the advantages of low VOC content, low odor, good product feel, high cost performance and broad market prospects.

[0023] In summary, this application has the following beneficial effects: 1. The present application utilizes the bonding properties of the PU leather foaming layer during the foaming molding process to compound the PU leather color layer and the base fabric layer, so that the PU leather color layer and the base fabric layer are firmly bonded, which can avoid the problem of glue seeping through the holes caused by the use of glue in the traditional method, and the problem of PU perforated leather and the transparent base fabric not being firmly bonded, resulting in the falling off; 2. The present invention introduces polyacrylic acid with adhesiveness into polyether polyurethane to improve the adhesiveness of polyether polyurethane; at the same time, the introduction of hydroxyl-terminated polyurethane prepolymer can effectively slow down the skinning speed of polyether polyurethane, and the solidification speed is fast, and the pore structure is a vertically long structure, so that the obtained PU leather foaming layer has good adhesiveness and small peel strength attenuation; 3. The raw materials of the PU leather foaming layer of the present application can improve the surface energy and surface activity of the polyether polyurethane by adding an appropriate amount of calcium pyrophosphate, so that the adhesion between the layers is stronger and it is not easy to peel off; 4. The PU leather of this application adopts a conical punching process, so that after the PU leather is punched, a funnel-shaped punching effect is formed by the color layer, foaming layer, and base fabric layer, highlighting the color contrast of the PU leather; at the same time, the preparation method is simple and controllable, with good repeatability, and the prepared material has the advantages of low VOC content, low odor, good product feel, high cost performance, and broad market prospects. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in combination with preparation examples, embodiments and comparative examples. The raw materials involved in the present application can be obtained commercially.

[0025] Preparation Example Preparation Example 1 In this preparation example, the preparation method of polyether polyurethane comprises the following steps: 1. At 75°C, 65.33 g of polytetrahydrofuran with a molecular weight of 2000, 83.15 g of diphenylmethane diisocyanate with an index of 0.35, and 1 g of monolaurin were added to N,N-dimethylformamide and reacted for 1.5 hours to obtain a hydroxyl-terminated polyurethane prepolymer with a solid content of 50 wt%; 2. Add A4 molecular sieve to the Shrek reaction bottle, remove water with acetylene flame, and vacuum remove water and oxygen in the bottle at the same time; after cooling, add N-methylpyrrolidine copper to prepare anhydrous and oxygen-free NMP solvent; pre-dry the 500ml four-necked flask and the condenser reflux tube, and vacuum dehydrate the polyethylene glycol at 120°C and 0.1Mpa for 5h; under nitrogen protection, add 22g of anhydrous NMP and 88.14g of polyethylene glycol, condense and reflux at 80°C, stir for 1h until the solution is transparent and clear, add 110.04g of isophorone diisocyanate, stir, react for 3h, add 2g of azobisisobutyronitrile for chain extension, maintain 80°C, stir for 2h, and cool the reactant to obtain an isocyanate-terminated polyurethane prepolymer; 3. Dissolve 6 g of polyacrylic acid in 100 g of anhydrous pyrrolidone, heat and stir at 60°C to form a clear polyacrylic acid solution; after cooling, add 10 g of hydroxyl-terminated polyurethane prepolymer, stir thoroughly to allow polyacrylic acid and hydroxyl-terminated polyurethane prepolymer to undergo graft copolymerization, react for 3 hours, heat to 50°C and continue to react for 2 hours; then drop 10 g of isocyanate-terminated polyurethane prepolymer, and maintain at 60°C for 7 hours to obtain a polyether polyurethane.

[0026] Preparation Example 2 In this preparation example, the preparation method of polyether polyurethane comprises the following steps: (1) At 75° C., 65.33 g of polytetrahydrofuran with a molecular weight of 2000, 83.15 g of diphenylmethane diisocyanate with an index of 0.35, and 1 g of monolaurin were added to N,N-dimethylformamide and reacted for 1.5 h to obtain a hydroxyl-terminated polyurethane prepolymer with a solid content of 50 wt %; (2) Add A4 molecular sieve to a Shrek reaction bottle, remove water with an acetylene flame, and simultaneously remove water and oxygen in the bottle by vacuuming; after cooling, add N-methylpyrrolidine copper to prepare anhydrous and oxygen-free NMP solvent; pre-dry a 500 ml four-necked flask and a condenser reflux tube, and vacuum dehydrate polyethylene glycol at 120° C. and 0.1 MPa for 5 h; under nitrogen protection, add 22 g of anhydrous NMP and 88.14 g of polyethylene glycol, condense and reflux at 80° C., stir for 1 h until the solution becomes transparent and clear, add 110.04 g of isophorone diisocyanate, stir, react for 3 h, add 2 g of azobisisobutyronitrile for chain extension, maintain 80° C., stir for 2 h, and cool the reactant to obtain an isocyanate-terminated polyurethane prepolymer; (3) Dissolve 2 g of polyacrylic acid in 100 g of anhydrous pyrrolidone, heat and stir at 60° C. to form a clear polyacrylic acid solution; after cooling, add 5 g of hydroxyl-terminated polyurethane prepolymer, stir thoroughly to allow polyacrylic acid and hydroxyl-terminated polyurethane prepolymer to undergo graft copolymerization, react for 3 h, heat to 50° C. and continue to react for 2 h; then drop 2 g of isocyanate-terminated polyurethane prepolymer into the solution, and keep at 30° C. for 4 h to obtain a polyether polyurethane.

[0027] Preparation Example 3 (1) At 75° C., 65.33 g of polytetrahydrofuran with a molecular weight of 2000, 83.15 g of diphenylmethane diisocyanate with an index of 0.35, and 1 g of monolaurin were added to N,N-dimethylformamide and reacted for 1.5 h to obtain a hydroxyl-terminated polyurethane prepolymer with a solid content of 50 wt %; (2) Add A4 molecular sieve to a Shrek reaction bottle, remove water with an acetylene flame, and simultaneously remove water and oxygen in the bottle by vacuuming; after cooling, add N-methylpyrrolidine copper to prepare anhydrous and oxygen-free NMP solvent; pre-dry a 500 ml four-necked flask and a condenser reflux tube, and vacuum dehydrate polyethylene glycol at 120° C. and 0.1 MPa for 5 h; under nitrogen protection, add 22 g of anhydrous NMP and 88.14 g of polyethylene glycol, condense and reflux at 80° C., stir for 1 h until the solution becomes transparent and clear, add 110.04 g of isophorone diisocyanate, stir, react for 3 h, add 2 g of azobisisobutyronitrile for chain extension, maintain 80° C., stir for 2 h, and cool the reactant to obtain an isocyanate-terminated polyurethane prepolymer; (3) Dissolve 10 g of polyacrylic acid in 100 g of anhydrous pyrrolidone, heat and stir at 60° C. to form a clear polyacrylic acid solution; after cooling, add 15 g of hydroxyl-terminated polyurethane prepolymer, stir thoroughly to allow polyacrylic acid and hydroxyl-terminated polyurethane prepolymer to undergo graft copolymerization, react for 3 h, heat to 50° C. and continue to react for 2 h; then drop 25 g of isocyanate-terminated polyurethane prepolymer, and maintain at 90° C. for 10 h to obtain a polyether polyurethane. Example

[0028] Example 1 The present application discloses a perforated color-transparent PU leather for automobile interior decoration, which comprises, from top to bottom, a PU leather color layer, a PU leather foaming layer and a base fabric layer, wherein the specific formula of the PU color layer is: 65 kg of waterborne polyurethane, 30 kg of nano calcium carbonate with a particle diameter of 100 nm, 2.5 kg of antioxidant and 2.5 kg of colorant; the specific formula of the PU leather foaming layer is: 65 kg of polyether polyurethane, 30 kg of nano titanium dioxide with a particle diameter of 100 nm, 1.2 kg of antioxidant and 0.8 kg of foaming colorant, wherein the polyether polyurethane is obtained by Preparation Example 1; the base fabric layer is made of polyester fiber.

[0029] Example 1 The preparation method of perforated color-transparent PU leather for automobile interior decoration is as follows: The raw materials of the PU leather color layer and the PU leather foaming layer were weighed according to the formula and placed in a mixer respectively. The raw materials were stirred for 10 minutes at a stirring speed of 2000 r / min to fully mix the raw materials to form a PU leather color layer slurry and a PU leather foaming layer slurry; The PU leather color layer and the PU leather foaming layer are formed by using the PU leather color layer slurry and the PU leather foaming layer slurry through the release paper coating method, and the PU leather color layer and the base fabric layer are bonded through the PU leather foaming layer to form a PU leather semi-finished product; The conical punching process is used to punch holes in the PU leather semi-finished product to make perforated transparent PU leather for automobile interior decoration.

[0030] Example 2 The difference between this embodiment and embodiment 1 is that the specific formula of the PU leather foam layer is: 50 kg of polyether polyurethane, 40 kg of nano-silicon dioxide with a particle size of 50 nm, 2 kg of stabilizer and 1 kg of foaming colorant, wherein the polyether polyurethane is obtained by Preparation Example 1.

[0031] Example 3 The difference between this embodiment and embodiment 1 is that the specific formula of the PU leather foam layer is: 80 kg of polyether polyurethane, 20 kg of nano titanium dioxide with a particle size of 100 nm, 0.5 kg of flame retardant and 0.5 kg of foaming colorant, wherein the polyether polyurethane is obtained in Preparation Example 1.

[0032] Example 4 The difference between this embodiment and embodiment 1 is that the polyether polyurethane in the PU leather foaming layer is obtained from Preparation Example 2.

[0033] Example 5 The difference between this embodiment and embodiment 1 is that the polyether polyurethane in the PU leather foaming layer is obtained from Preparation Example 3.

[0034] Example 6 The difference between this embodiment and embodiment 1 is that the specific formula of the PU leather foam layer is: 65kg of polyether polyurethane, 30kg of nano titanium dioxide with a particle size of 100nm, 1.2kg of antioxidant, 0.8kg of foaming colorant and 3kg of calcium pyrophosphate, wherein the polyether polyurethane is obtained by Preparation Example 1.

[0035] Example 7 The difference between this embodiment and embodiment 1 is that the specific formula of the PU leather foam layer is: 65kg of polyether polyurethane, 30kg of nano titanium dioxide with a particle size of 100nm, 1.2kg of antioxidant, 0.8kg of foaming colorant and 1kg of calcium pyrophosphate, wherein the polyether polyurethane is obtained by Preparation Example 1.

[0036] Example 8 The difference between this embodiment and embodiment 1 is that the specific formula of the PU leather foam layer is: 65kg of polyether polyurethane, 30kg of nano titanium dioxide with a particle size of 100nm, 1.2kg of antioxidant, 0.8kg of foaming colorant and 5kg of calcium pyrophosphate, wherein the polyether polyurethane is obtained by Preparation Example 1.

[0037] Example 9 The present embodiment is different from the first embodiment in that the present application discloses a perforated color-transparent PU leather for automobile interior decoration, which comprises, from top to bottom, a surface coating, a PU leather color layer, a PU leather foaming layer and a base fabric layer, wherein the surface coating is obtained by coating with a water-based modified acrylic polyurethane finishing agent, and the water-based modified acrylic polyurethane finishing agent is obtained by a solution polymerization method, see Zuo Changjiang, Zhang Dexia, You Xiuwei, et al. Development of Acrylic Polyurethane Emulsion Coatings. Coatings Industry, 2004, 34(4): 18-21, which will not be elaborated here.

[0038] The preparation method of the perforated color-transparent PU leather for automobile interior decoration of this embodiment is as follows: The raw materials of the PU leather color layer and the PU leather foaming layer were weighed according to the formula and placed in a mixer respectively. The raw materials were stirred for 10 minutes at a stirring speed of 2000 r / min to fully mix the raw materials to form a PU leather color layer slurry and a PU leather foaming layer slurry; The PU leather color layer and the PU leather foaming layer are formed by using the PU leather color layer slurry and the PU leather foaming layer slurry through the release paper coating method, and the PU leather color layer and the base fabric layer are bonded through the PU leather foaming layer to form a PU leather semi-finished product; The water-based modified acrylic polyurethane finishing agent is applied on the surface of the PU leather semi-finished product to prepare the PU leather; The PU leather is punched using a conical punching process to produce perforated, color-transparent PU leather for automotive interiors.

[0039] Comparative Example Comparative Example 1 The perforated transparent PU leather for automobile interior in this comparative example includes a PU leather color layer and a base fabric layer from top to bottom, wherein the specific formula of the PU color layer is: 65 kg of waterborne polyurethane, 30 kg of nano calcium carbonate with a particle size of 100 nm, 2.5 kg of antioxidant and 2.5 kg of colorant; the base fabric layer is made of polyester fiber.

[0040] The preparation method of the perforated color-transparent PU leather for automobile interior decoration of this comparative example is as follows: Weigh the raw materials of the PU leather color layer according to the formula and put them into a mixer. Stir for 10 minutes at a stirring speed of 2000 r / min to fully mix the raw materials to form a PU leather color layer slurry; The PU leather color layer is formed by using the PU leather color layer slurry through a release paper coating method, and the PU leather color layer and the base fabric layer are bonded by glue to form a PU leather semi-finished product; The punching process is adopted to punch holes in the PU leather semi-finished product to produce perforated transparent PU leather for automobile interior decoration.

[0041] Performance testing 1. Peel strength The perforated transparent PU leather for automobile interior prepared in the examples and comparative examples was cut into samples of 100 mm×30 mm for performance testing with reference to SATRATM 410. A proper amount of glue was applied to the center of the front side of the sample. Then, the back side of the sample was placed on the fixture of the testing machine so that the glue was in contact with the testing fixture. The testing machine was started and the sample was pulled out at a pulling speed of 100 mm / min per second. The force when the sample was completely removed from the glue was recorded. The test results are shown in Table 1.

[0042] 2. Wear resistance According to GB / T 1768-2008, the perforated color-transparent PU leather for automobile interior prepared in the embodiment and the comparative example was subjected to performance test, and the mass loss of the samples was calculated. The test results are shown in Table 1.

[0043] Table 1 Performance test data of Examples 1-9 and Comparative Example 1 Referring to Table 1, in combination with Examples 1-9 and Comparative Example 1, it can be seen that the perforated color-transparent PU leather for automotive interior of the present application has higher peel strength than the traditional PU synthetic leather bonded with glue. This is because the present application utilizes the bonding properties of the PU leather foaming layer itself during the foaming molding process to compound the PU leather color layer and the base fabric layer. The high bonding strength of this composite cannot be achieved by using an adhesive, so that the PU leather color layer and the base fabric layer are firmly bonded, which can avoid the problem of glue seeping through the holes caused by the use of glue in the traditional method, and the problem of PU perforated leather and the color-transparent base fabric not firmly bonding and causing shedding; in particular, the introduction of adhesive polyacrylic acid into the polyether polyurethane can improve the adhesiveness of the polyether polyurethane; at the same time, the introduction of a hydroxyl-terminated polyurethane prepolymer can effectively slow down the skinning speed of the polyether polyurethane, the solidification speed is fast, and the pore structure is a vertically long structure, so that the obtained PU leather foaming layer has good adhesiveness and small peel strength attenuation.

[0044] With reference to Table 1, in combination with Examples 1, 6-8, it can be seen that adding an appropriate amount of sodium pyrophosphate to the PU foam leather can further improve the peel strength of the perforated transparent PU leather for automotive interior, and calcium pyrophosphate can increase the surface energy and surface activity of the polyether polyurethane, making the adhesion between the layers stronger and not easy to peel off.

[0045] Referring to Table 1, in combination with Examples 1 and 9, it can be seen that the present application is to coat the PU leather color layer with a surface coating coated with a water-based modified acrylic polyurethane finishing agent. The water-based polyurethane finishing agent has the advantages of being environmentally friendly, non-toxic, and pollution-free, and the acrylic acid and the polyurethane molecules react chemically, and the polyurethane and the acrylate achieve complementary advantages in performance. The obtained water-based modified acrylic polyurethane finishing agent has the excellent properties of both polyurethane and acrylate, and has the characteristics of good gloss, wear resistance, corrosion resistance, good weather resistance, water resistance, and good mechanical properties, thereby improving the wear resistance of the perforated transparent PU leather for automotive interiors. At the same time, the present application uses a water-based modified acrylic polyurethane finishing agent to improve the bonding with the PU leather color layer.

[0046] The perforated transparent PU leather for automobile interior prepared in this application not only meets the national mandatory standards, but also has a simple and controllable preparation method with good repeatability. The prepared material has the advantages of low VOC content, low odor, good product feel, high cost performance, and broad market prospects.

[0047] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A perforated color-transparent PU leather for automobile interior, characterized in that: From top to bottom, it includes a PU leather color layer, a PU leather foaming layer and a base fabric layer; The PU leather foaming layer is made of the following raw materials in parts by weight: 50-80 parts of polyether polyurethane, 20-40 parts of fillers, 0.5-1 parts of foaming colorants and 0.5-2 parts of additives.

2. The perforated color-transparent PU leather for automobile interior decoration according to claim 1, characterized in that: The polyether polyurethane comprises the following raw materials in parts by weight: 2-20 parts of isocyanate-terminated polyurethane prepolymer, 5-15 parts of hydroxyl-terminated polyurethane prepolymer, 2-10 parts of polyacrylic acid and 100 parts of solvent.

3. The perforated color-transparent PU leather for automobile interior decoration according to claim 2, characterized in that: The preparation method of the polyether polyurethane comprises the following steps: The diisocyanate, polyether diol and monoglyceride of fatty acid are mixed and reacted in the presence of a solvent to obtain a hydroxyl-terminated polyurethane prepolymer; The diisocyanate, the polyether diol and the crosslinking agent are mixed and reacted in the presence of a solvent to obtain an isocyanate-terminated polyurethane prepolymer; Dissolve polyacrylic acid in an organic solvent to obtain a polyacrylic acid solution; add a hydroxyl-terminated prepolymer to obtain a polyacrylic acid-polyurethane graft copolymerization solution; add an isocyanate-terminated polyurethane prepolymer to the polyacrylic acid-polyurethane graft copolymerization solution, react at 30-90° C. for 4-10 hours, and obtain a polyether polyurethane.

4. The perforated color-transparent PU leather for automobile interior decoration according to claim 3, characterized in that: The diisocyanate is one or more of isophorone diisocyanate, 1,5-naphthalene diisocyanate, diphenylmethane diisocyanate, and hexamethylene diisocyanate; the polyether diol is one or more of polytetrahydrofuran, polyether diol N210, polyethylene glycol, and polypropylene glycol; the monofatty acid glyceride is one or more of palmitic acid glyceryl, monolauric acid glyceryl, monostearic acid glyceryl, and monooleic acid glyceryl; the cross-linking agent is one or more of azobisisobutyronitrile, azobisisoheptylnitrile, dimethyl azobisisobutyrate, benzoyl peroxide, tert-butyl benzoyl peroxide, methyl ethyl ketone peroxide, and ammonium persulfate; and the organic solvent is one or more of N-methylpyrrolidone, N,N-dimethylformamide, isopropanol, and ethanol.

5. The perforated color-transparent PU leather for automobile interior decoration according to claim 1, characterized in that: The raw materials of the PU leather foaming layer also include 1-5 parts by weight of calcium pyrophosphate.

6. The perforated color-transparent PU leather for automobile interior decoration according to claim 1, characterized in that: The filler is one or more of nano calcium carbonate, nano titanium dioxide, nano silicon dioxide, and nano zinc dioxide, and the particle size of the filler is ≤200nm.

7. The perforated color-transparent PU leather for automobile interior decoration according to claim 1, characterized in that: The auxiliary agent is one or more of a stabilizer, an antioxidant, and a flame retardant.

8. The perforated color-transparent PU leather for automobile interior decoration according to claim 1, characterized in that: The surface of the PU leather color layer is coated with a water-based modified acrylic polyurethane finishing agent to form a surface coating.

9. The method for preparing the perforated color-transparent PU leather for automobile interior decoration according to any one of claims 1 to 7, characterized in that: The following steps are involved: Mixing and extruding corresponding weights of PU leather foaming layer raw materials to form PU leather foaming layer slurry; Through the release paper coating method, the PU leather foaming layer slurry is bonded to the PU leather color layer and the base fabric layer to make PU leather; The PU leather is punched through with a cone to form a perforated, color-transparent PU leather for automotive interiors.

10. The method for preparing the perforated color-transparent PU leather for automobile interior decoration according to claim 8, characterized in that: The following steps are involved: Mixing and extruding corresponding weights of PU leather foaming layer raw materials to form PU leather foaming layer slurry; Through the release paper coating method, the PU leather foaming layer slurry is used to bond the PU leather color layer and the base fabric layer to make a PU leather semi-finished product; The water-based modified acrylic polyurethane finishing agent is applied on the surface of the PU leather semi-finished product to prepare the PU leather; The PU leather is punched through with a cone-shaped hole to form a perforated, color-transparent PU leather for automotive interiors.

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