High light resistance polyurethane composite material and preparation method and application thereof

Abstract

This invention relates to a high lightfast polyurethane composite material, comprising, from top to bottom, a polyurethane top layer, a polyurethane intermediate layer, a solvent-free polyurethane adhesive layer, and a base fabric layer. The solvent-free polyurethane adhesive layer is prepared from a solvent-free polyurethane adhesive layer slurry, which is a mixture of polyether-type polyol component A and isocyanate prepolymer component B. The polyether-type polyol component A is prepared from the following components in parts by weight: 100 parts polyether-type polyol, 20-80 parts filler, 0.38-0.48 parts composite catalyst, and 0.5-1 parts anti-yellowing agent. The composite catalyst is formed by combining organometallic catalysts and amine catalysts. The solvent-free polyurethane adhesive layer of this invention's high lightfast polyurethane composite material exhibits good adhesion, achieving excellent bonding with the base fabric and forming a good lightfast and heat-resistant system in each layer, resulting in a composite material with excellent lightfastness and heat-resistant color-changing properties.

Description

Technical Field

[0001] This invention relates to the field of polyurethane composite materials technology, and in particular to a high lightfastness polyurethane composite material, its preparation method, and its application. Background Technology

[0002] In recent years, new energy vehicles from emerging car manufacturers have gained popularity, and the concepts of green, natural, eco-friendly, and minimalist interior design have become increasingly popular. New energy vehicle interiors now feature many light or medium-light colors, placing higher demands on the material properties of automotive interiors, especially their lightfastness. Based on the conventional solvent-free aromatic structure, the large π bond on the aromatic benzene ring forms a conjugation with the adjacent NCO group. Under light, heat, and oxygen conditions, especially after polyurethane absorbs 290nm–400nm ultraviolet light, the polyurethane chain is prone to breakage and cross-linking, leading to a decrease in the mechanical properties of polyurethane products and the degradation of chromophores. This not only affects the appearance of the interior but also directly shortens the lifespan of the surface layer.

[0003] To address the aforementioned issues, current practices involve replacing aromatic isocyanate prepolymers with aliphatic ones in the solvent-free layer, thereby mitigating the problem of poor yellowing and overall poor lightfastness in the solvent-free layer. However, aliphatic isocyanates lack the conjugation effect of benzene rings, resulting in lower reactivity. This makes them difficult to bond with the base fabric layer during processing, failing to meet adhesion requirements. Furthermore, aliphatic polyurethanes have poor heat resistance, easily undergoing oxidative decomposition at high temperatures, leading to heat discoloration. Summary of the Invention

[0004] Based on this, and in view of the problems existing in the prior art, the purpose of this invention is to provide a high lightfast polyurethane composite material, its preparation method and application. The solvent-free polyurethane adhesive layer of this high lightfast polyurethane composite material has good adhesion, achieving good adhesion to the base fabric, and forming a good lightfast and heat-resistant system in each layer. This makes the composite material have excellent lightfastness and heat-resistant color change properties, further reducing the color change of light and medium light-colored interiors under light, heat and oxygen environments.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] The present invention provides a high lightfast polyurethane composite material, which includes a polyurethane surface layer, a polyurethane intermediate layer, a solvent-free polyurethane adhesive layer, and a base fabric layer arranged sequentially from top to bottom.

[0007] The solvent-free polyurethane adhesive layer is prepared from a solvent-free polyurethane adhesive layer slurry, which is composed of polyether-type polyol component A and isocyanate prepolymer B mixed at a mass ratio of 100:60-70; wherein:

[0008] The polyether polyol A material is prepared from the following components in parts by weight: 100 parts polyether polyol, 20-80 parts filler, 0.38-0.48 parts composite catalyst, and 0.5-1 parts anti-yellowing agent; the composite catalyst is formed by compounding organometallic catalysts and amine catalysts.

[0009] The isocyanate prepolymer B is an aliphatic isocyanate prepolymer.

[0010] As a further improvement to the above-mentioned scheme of the present invention, in the composite catalyst, the organometallic catalyst and the amine catalyst are compounded in a mass ratio of 0.3:0.08-0.18.

[0011] As a further improvement to the above-described scheme of the present invention, the organometallic catalyst is one of zinc catalysts, bismuth catalysts, and methyltin catalysts;

[0012] And / or, the amine catalyst is a compound of phenol and azeotropic compounds.

[0013] As a further improvement of the above-mentioned solution of the present invention, the polyurethane surface layer is prepared by polyurethane surface layer slurry, which is prepared by the following components in parts by weight: 150 parts of aliphatic polyurethane resin, 10-50 parts of N,N-dimethylformamide, 0.5-1.5 parts of anti-yellowing additive, and 5-10 parts of color paste.

[0014] And / or, the polyurethane intermediate layer is prepared from a polyurethane intermediate layer slurry, which is prepared from the following components in parts by weight: 150 parts aliphatic polyurethane resin, 10-50 parts N,N-dimethylformamide, 0.5-1.5 parts anti-yellowing agent, and 5-10 parts color paste.

[0015] As a further improvement to the above-described scheme of the present invention, the anti-yellowing agent is composed of an anti-ultraviolet agent and an antioxidant in a mass ratio of 1:2. Preferably, the anti-ultraviolet agent is a formamidin-based high-efficiency ultraviolet absorber, and the antioxidant is a phosphite antioxidant.

[0016] This invention also proposes a method for preparing the high lightfastness polyurethane composite material as described above, comprising the following steps:

[0017] S1. Coat the release paper with a polyurethane surface layer paste and dry it to form a polyurethane surface layer;

[0018] S2. Coat the polyurethane intermediate layer slurry onto the polyurethane surface layer and dry it to form a polyurethane intermediate layer;

[0019] S3. Coat the polyurethane intermediate layer with a solvent-free polyurethane adhesive layer slurry and bake until semi-dry to form a solvent-free polyurethane adhesive layer;

[0020] S4. The base fabric is bonded to the solvent-free polyurethane adhesive layer and dried to obtain a high lightfast polyurethane composite material.

[0021] As a further improvement of the above-mentioned solution of the present invention, in step S1, the polyurethane surface layer slurry is coated onto the surface of the release paper with a blade gap of 15-25 mils, and then placed at 100-140℃ for 1-2 minutes to obtain the polyurethane surface layer.

[0022] And / or, in step S2, the polyurethane intermediate layer slurry is coated onto the surface of the polyurethane surface layer with a blade gap of 15-25 mils, and then treated at 100-140℃ for 1-2 minutes to obtain the polyurethane intermediate layer.

[0023] And / or, in step S3, the solvent-free polyurethane adhesive layer slurry is applied to the surface of the polyurethane intermediate layer with a blade gap of 25-45 mils, and then baked at 80-120℃ for 1-2 minutes to obtain the solvent-free polyurethane adhesive layer.

[0024] And / or, in step S4, after the base fabric is laminated with the solvent-free polyurethane adhesive layer by laminating 60-100 filaments, it is treated at 125-135℃ for 4-8 minutes to obtain the high lightfastness polyurethane composite material.

[0025] As a further improvement to the above-described solution of the present invention, the following steps are also included:

[0026] S5. Coat the surface of the high lightfast polyurethane composite material with an aqueous polyurethane slurry, and after drying, form a surface treatment layer to obtain the finished high lightfast polyurethane composite material.

[0027] As a further improvement to the above-mentioned solution of the present invention, the waterborne polyurethane slurry is prepared from the following components in parts by weight: 100 parts waterborne polyurethane, 0.5-1.0 parts yellowing resistance agent, 0.5-1.5 parts leveling agent, and 3-5 parts curing agent.

[0028] And / or, in step S5, after coating the surface of the high lightfast polyurethane composite material with water-based polyurethane slurry using a roller coating process, it is treated at 120-160℃ for 3-6 minutes to obtain the finished high lightfast polyurethane composite material.

[0029] The present invention also proposes the application of a high lightfast polyurethane composite material as described above, or a high lightfast polyurethane composite material prepared by the preparation method described above, in automotive interiors.

[0030] It should be noted that in this invention, there are no special requirements for the aliphatic polyurethane resin and color paste in the polyurethane surface layer and polyurethane intermediate layer, and they can be adjusted according to product requirements. Preferably, the color paste can be selected according to the product performance requirements, so it is not specifically limited here.

[0031] It should be noted that in this invention, the polyether-type polyol and filler of the solvent-free polyurethane adhesive layer are not particularly limited. Those skilled in the art can select them according to the actual situation. For example, some functional fillers can be selected according to the functional needs of the product to improve the mechanical properties or flame retardant properties of the product. Preferably, the filler is selected from at least one of powdered calcium carbonate, diatomaceous earth, aluminum hydroxide, antimony trioxide, bromine flame retardant, and phosphorus flame retardant.

[0032] It should be noted that the base fabric layer is not particularly limited in this invention and can be selected according to the application part of the product. In some specific embodiments of this invention, the base fabric is selected from at least one of warp-knitted fabric, weft-knitted fabric, microfiber, and 3D mesh fabric.

[0033] It should be noted that the preparation of the waterborne polyurethane slurry in this invention is not particularly limited, and those skilled in the art can make selections according to actual conditions. The curing agent of the waterborne polyurethane slurry can be selected from at least one of polycarbodiimide crosslinking agents and isocyanate crosslinking agents, and the leveling agent can be selected from polyether modified siloxane.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The solvent-free polyurethane adhesive layer of this invention has an aliphatic fully crosslinked polyether structure. In this structure, a composite catalyst, consisting of organometallic and amine catalysts, is added to the polyether-type polyol composition A. The metal catalyst primarily promotes the reaction between the isocyanate prepolymer and the polyether prepolymer, i.e., the polyurethane molecular chain growth and crosslinking reaction. The amine catalyst primarily promotes the reaction between the isocyanate prepolymer and water, i.e., the foaming reaction. During polyurethane formation, these two reactions occur simultaneously and compete with each other. For the aliphatic fully crosslinked polyether structure, if the relative content of the metal catalyst is low and the amine catalyst is high, then… The initial reaction is slow, and the post-curing is poor. If the content of metal catalysts is relatively high and the content of amine catalysts is low, it is difficult to control the viscosity of the material during processing, and the leather has a poor feel after processing. This invention combines organometallic catalysts and amine catalysts in a mass ratio of 0.3:0.08-0.18. The composite catalyst can effectively balance the control of foaming and gelation reactions, so that the low-activity aliphatic isocyanate prepolymer B can form a good curing crosslink with the polyether polyol combination A, thereby making the material easy to process and with high physical properties. In addition, it can ensure the adhesion of the solvent-free polyurethane adhesive layer and achieve good adhesion to the base fabric.

[0036] 2. In this invention, anti-yellowing agents are added to the polyurethane surface layer, polyurethane intermediate layer, solvent-free polyurethane adhesive layer, and surface treatment layer, respectively. The anti-yellowing agents are formed by the compounding of UV stabilizers and antioxidants. The UV stabilizers can absorb ultraviolet rays, preventing the UV energy from damaging the chemical bond structure within the polyurethane molecules and can capture active free radicals, preventing subsequent photo-oxidation chain reactions. The antioxidants mainly prevent oxidative degradation during high-temperature processing by capturing peroxide free radicals (ROO·) and decomposing hydrogen peroxide (ROOH) in the reaction, effectively protecting the polyurethane product. The simultaneous addition of UV stabilizers and antioxidants in this invention can effectively enhance the stability of polyurethane materials during processing, improve weather resistance, and extend product lifespan. It not only further improves the photodegradability resistance in the aliphatic system but also optimizes the heat degradation resistance of aliphatic polyurethane, forming a good light and heat resistant system in each layer. This makes the composite material have excellent light and heat resistance and color change performance, further reducing the color change of light and medium-light colored interiors under light, heat, and oxygen environments. In this invention, the anti-ultraviolet agent and antioxidant are prepared in a mass ratio of 1:2. The higher proportion of antioxidant is mainly to improve the heat resistance of aliphatic molecules. Detailed Implementation

[0037] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0039] The present invention will be described below through specific embodiments. It should be noted that the specific embodiments below are for illustrative purposes only and do not limit the scope of the present invention in any way. In addition, unless otherwise specified, methods that do not specifically describe conditions or steps are conventional methods, and the reagents and materials used can be obtained commercially.

[0040] The reagent and material information involved in the following examples or comparative examples is as follows:

[0041] The polyurethane resin LY-58PC (aliphatic polycarbonate polyurethane, 100% modulus 4.5±1.0MPa) and solvent-free isocyanate prepolymer B material 3016B (aliphatic, NCO content 16±0.5%) are both from Hefei Anli Polyurethane New Materials Co., Ltd.

[0042] The solvent-free polyether polyurethanes Haptex CC 6945 / 100C-A and Haptex CC 6945 / 100C-B, and the solvent-free catalysts Additive CX 93600 and Additive CX 93540 are all from BASF Polyurethane Specialty Products (China) Co., Ltd.

[0043] The color paste was purchased from Foshan Shunde Baoster Pigment Co., Ltd.

[0044] The calcium carbonate filler was purchased from Anhui Wanjiang Nanotechnology Co., Ltd.

[0045] The polycarbonate-based waterborne polyurethane WF-3649 was purchased from Starr Fine Coatings (Suzhou) Co., Ltd.

[0046] Curing agent XR-5580 and leveling agent LA-91-120 were purchased from Starr Fine Coatings (Suzhou) Co., Ltd.

[0047] The ultraviolet absorber UNISORB-979 and the antioxidant UHS-8080F were both purchased from Yuanhe Industrial Co., Ltd.

[0048] The base fabric is PK280 weft-knitted fabric, purchased from Jiangsu Beltefu New Materials Co., Ltd.

[0049] Example 1

[0050] This embodiment proposes a high lightfast polyurethane composite material for automotive interiors, the preparation method of which includes the following five steps S1-S5.

[0051] S1. Apply the aliphatic polyurethane surface layer slurry to the surface of the release paper with a blade gap of 15 mils, and bake at 100℃ for 2 minutes to form the polyurethane surface layer, i.e., the automotive interior texture layer. The surface layer polyurethane slurry is prepared from the following raw materials in parts by weight: 150 parts LY-58PC, 50 parts N,N-dimethylformamide, 0.5 parts anti-yellowing agent (of which, by weight ratio, UNISORB-979:UHS-8080F=1:2), and 5 parts colorant.

[0052] S2. Apply the aliphatic polyurethane intermediate layer slurry to the surface of the polyurethane top layer with a blade gap of 15 mils, and bake at 100℃ for 2 minutes to form the polyurethane intermediate layer. The polyurethane intermediate layer slurry is prepared from the following raw materials in parts by weight: 150 parts LY-58PC, 50 parts N,N-dimethylformamide, and 5 parts colorant.

[0053] S3. A solvent-free polyether polyol composition A and 3016B are mixed at a mass ratio of 100:60 to prepare a solvent-free polyurethane adhesive layer slurry. The solvent-free polyurethane adhesive layer slurry is coated onto the surface of the polyurethane intermediate layer with a blade gap of 25 mils, and then baked at 80℃ for 2 minutes to obtain a viscous solvent-free polyurethane adhesive layer. The polyether polyol composition A is prepared from the following raw materials in parts by mass: 100 parts Haptex CC 6945 / 100C-A, 80 parts calcium carbonate, 0.5 parts anti-yellowing additive (wherein, by mass ratio, UNISORB-979:UHS-8080F=1:2), 0.3 parts Additive CX 93540, and 0.08 parts Additive CX 93600.

[0054] S4. Lay 60 filaments of weft-knitted fabric PK280 onto a solvent-free polyurethane adhesive layer, bake at 125℃ for 8 minutes, cool, separate, and roll up to obtain a semi-finished product.

[0055] S5. A water-based polyurethane slurry is coated onto the surface of the semi-finished product using a roller coating process. The coating is then heated at 120℃ for 6 minutes to form a surface treatment layer, resulting in the final high-light-resistance polyurethane composite material for automotive interiors. The water-based polyurethane slurry is prepared from the following raw materials in parts by weight: 100 parts water-based polyurethane WF-3649, 0.5 parts LA-91-120, 0.5 parts anti-yellowing additive (wherein, by weight ratio, UNISORB-979:UHS-8080F=1:2), and 3 parts XR 5580.

[0056] Example 2

[0057] This embodiment proposes a high lightfast polyurethane composite material for automotive interiors, the preparation method of which includes the following five steps S1-S5.

[0058] S1. Apply the aliphatic polyurethane surface layer slurry to the surface of the release paper with a blade gap of 20 mils, and bake at 120℃ for 1.5 min to form the polyurethane surface layer, i.e., the automotive interior texture layer. The polyurethane surface layer slurry is prepared from the following raw materials in parts by weight: 150 parts LY-58PC, 30 parts N,N-dimethylformamide, 1 part anti-yellowing agent (UNISORB-979:UHS-8080F = 1:2), and 7.5 parts colorant.

[0059] S2. Apply the aliphatic polyurethane intermediate layer slurry to the surface of the polyurethane top layer with a blade gap of 20 mils, and bake at 120℃ for 1.5 min to form the polyurethane intermediate layer. The polyurethane intermediate layer slurry is prepared from the following raw materials in parts by weight: 150 parts LY-58PC, 30 parts N,N-dimethylformamide, and 7.5 parts colorant.

[0060] S3. A solvent-free polyether polyol composition A and 3016B are mixed at a mass ratio of 100:65 to prepare a solvent-free polyurethane adhesive layer slurry. The solvent-free polyurethane adhesive layer slurry is coated onto the surface of the polyurethane intermediate layer with a blade gap of 35 mils, and then baked at 100℃ for 1.5 min to obtain a viscous solvent-free polyurethane adhesive layer. The polyether polyol composition A is prepared from the following raw materials in parts by mass: 100 parts Haptex CC 6945 / 100C-A, 50 parts calcium carbonate, 0.75 parts anti-yellowing additive (wherein, by mass ratio, UNISORB-979:UHS-8080F=1:2), 0.3 parts Additive CX93540, and 0.13 parts Additive CX 93600.

[0061] S4. Lay 80 filaments of weft-knitted fabric PK280 onto a solvent-free polyurethane adhesive layer, bake at 125℃ for 8 minutes, cool, separate, and roll up to obtain a semi-finished product.

[0062] S5. A water-based polyurethane slurry is coated onto the surface of the semi-finished product using a roller coating process. The coating is then heated at 140℃ for 4.5 minutes to form a surface treatment layer, resulting in the final high-light-resistance polyurethane composite material for automotive interiors. The water-based polyurethane slurry is prepared from the following raw materials in parts by weight: 100 parts water-based polyurethane WF-3649, 1 part LA-91-120, 0.75 parts anti-yellowing additive (wherein, by weight ratio, UNISORB-979:UHS-8080F=1:2), and 4 parts XR 5580.

[0063] Example 3

[0064] This embodiment proposes a high lightfast polyurethane composite material for automotive interiors, the preparation method of which includes the following five steps S1-S5.

[0065] S1. Apply the aliphatic polyurethane surface layer slurry to the surface of the release paper with a blade gap of 25 mils, and bake at 140℃ for 1 minute to form the polyurethane surface layer, i.e., the automotive interior texture layer. The polyurethane surface layer slurry is prepared from the following raw materials in parts by weight: 150 parts LY-58PC, 10 parts N,N-dimethylformamide, 1.5 parts anti-yellowing agent (of which, by weight ratio, UNISORB-979:UHS-8080F=1:2), and 10 parts colorant.

[0066] S2. Apply the aliphatic polyurethane intermediate layer slurry to the surface of the polyurethane top layer with a blade gap of 25 mils, and bake at 140℃ for 1 minute to form the polyurethane intermediate layer. The polyurethane intermediate layer slurry is prepared from the following raw materials in parts by weight: 150 parts LY-58PC, 10 parts N,N-dimethylformamide, 1.5 parts anti-yellowing agent (of which, by weight ratio, UNISORB-979:UHS-8080F=1:2), and 10 parts colorant.

[0067] S3. A solvent-free polyether polyol composition A and 3016B are mixed at a mass ratio of 100:70 to prepare a solvent-free polyurethane adhesive layer slurry. The solvent-free polyurethane adhesive layer slurry is applied to the surface of the surface layer with a blade gap of 45 mils, and then baked at 120°C for 1 minute to obtain a viscous solvent-free polyurethane adhesive layer. The polyether polyol composition A is prepared from the following raw materials in parts by mass: 100 parts Haptex CC 6945 / 100C-A, 20 parts calcium carbonate, 1 part anti-yellowing additive (wherein, by mass ratio, UNISORB-979:UHS-8080F=1:2), 0.3 parts Additive CX 93540, and 0.18 parts Additive CX 93600.

[0068] S4. Lay 100 filaments of weft-knitted fabric PK280 onto a solvent-free polyurethane adhesive layer, bake at 135℃ for 4 minutes, cool, separate, and roll up to obtain a semi-finished product.

[0069] S5. A water-based polyurethane slurry is coated onto the surface of the semi-finished product using a roller coating process. The product is then heated at 160℃ for 3 minutes to form a surface treatment layer, resulting in the final high-light-resistance polyurethane composite material for automotive interiors. The water-based polyurethane slurry is prepared from the following raw materials in parts by weight: 100 parts water-based polyurethane WF-3649, 1.5 parts LA-91-120, 1 part anti-yellowing additive (wherein, by weight ratio, UNISORB-979:UHS-8080F=1:2), and 5 parts XR5580.

[0070] Comparative Example 1

[0071] This comparative example uses the same implementation method as Example 3, except that: in this comparative example, no yellowing resistant additives are added to the polyurethane top layer slurry, polyurethane intermediate layer slurry, solvent-free polyurethane adhesive layer slurry, and water-based polyurethane slurry.

[0072] Comparative Example 2

[0073] This comparative example uses the same implementation method as Example 3, except that: in this comparative example, the solvent-free polyurethane adhesive layer is formed by mixing polyether-type polyol combination A and aromatic Haptex CC 6945 / 100C-B at a mass ratio of 100:70 to prepare a solvent-free polyurethane adhesive layer slurry. The solvent-free polyurethane adhesive layer slurry is coated onto the surface of the polyurethane surface layer with a blade gap of 45 mils, and then baked at 120°C for 1 minute to obtain a viscous solvent-free polyurethane adhesive layer; wherein, polyether-type polyol combination A is prepared from the following raw materials in parts by mass: 100 parts Haptex CC 6945 / 100C-A, 20 parts calcium carbonate, 1 part anti-yellowing additive (wherein, by mass ratio, UNISORB-979:UHS-8080F=1:2), 0.03 parts Additive CX 93540 and 0.18 parts Additive CX 93600.

[0074] Comparative Example 3

[0075] This comparative example uses the same implementation method as Example 3, except that the polyether polyol composition A in this comparative example is prepared from the following parts by weight of raw materials: 100 parts of Haptex CC 6945 / 100C-A, 20 parts of calcium carbonate, 1 part of anti-yellowing additive (wherein, by mass ratio, UNISORB-979:UHS-8080F=1:2), 0.03 parts of Additive CX 93540 and 0.18 parts of Additive CX 93600.

[0076] Comparative Example 4

[0077] This comparative example uses the same implementation method as Example 3, except that the polyether polyol composition A in this comparative example is prepared from the following parts by weight of raw materials: 100 parts of Haptex CC 6945 / 100C-A, 20 parts of calcium carbonate, 1 part of anti-yellowing additive (wherein, by mass ratio, UNISORB-979:UHS-8080F=1:2), 2 parts of Additive CX 93540 and 0.05 parts of Additive CX 93600.

[0078] Test case

[0079] The polyurethane composite materials prepared in the examples and comparative examples were subjected to relevant performance tests, and the results are shown in Table 1.

[0080] Table 1

[0081]

[0082]

[0083] As can be seen from the results in Table 1, the polyurethane composite materials prepared in Examples 1-3 of the present invention have better heat resistance and light resistance than the polyurethane composite materials prepared in Comparative Examples 1 and 2. The polyurethane composite materials prepared in Examples 1-3 of the present invention have better bonding performance (peel strength) and hydrolysis resistance than the polyurethane composite materials prepared in Comparative Examples 3-4.

[0084] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0085] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A high lightfast polyurethane composite material, characterized in that, It includes, from top to bottom, a polyurethane top layer, a polyurethane intermediate layer, a solvent-free polyurethane adhesive layer, and a base fabric layer; The solvent-free polyurethane adhesive layer is prepared from a solvent-free polyurethane adhesive layer slurry, which is composed of polyether-type polyol component A and isocyanate prepolymer B mixed at a mass ratio of 100:60-70; wherein: The polyether-type polyol composition A is prepared from the following components in parts by weight: 100 parts polyether-type polyol, 20-80 parts filler, 0.38-0.48 parts composite catalyst, and 0.5-1 parts anti-yellowing agent; the composite catalyst is formed by compounding organometallic catalyst and amine catalyst in a mass ratio of 0.3:0.08-0.

18. The isocyanate prepolymer B is an aliphatic isocyanate prepolymer; The polyurethane surface layer is prepared from a polyurethane surface layer slurry, which is composed of the following components in parts by weight: 150 parts aliphatic polyurethane resin, 10-50 parts N,N-dimethylformamide, 0.5-1.5 parts anti-yellowing agent, and 5-10 parts color paste; the polyurethane intermediate layer is prepared from a polyurethane intermediate layer slurry, which is composed of the following components in parts by weight: 150 parts aliphatic polyurethane resin, 10-50 parts N,N-dimethylformamide, 0.5-1.5 parts anti-yellowing agent, and 5-10 parts color paste. The anti-yellowing agent is a compound of UV stabilizer and antioxidant in a mass ratio of 1:2; the organometallic catalyst is one of zinc catalyst, bismuth catalyst, and methyltin catalyst; the amine catalyst is a compound of phenol and azeotropic acid.

2. A method for preparing a high lightfast polyurethane composite material as described in claim 1, characterized in that, Includes the following steps: S1. Coat the release paper with a polyurethane surface layer paste and dry it to form a polyurethane surface layer; S2. Coat the polyurethane intermediate layer slurry onto the polyurethane surface layer and dry it to form a polyurethane intermediate layer; S3. Coat the polyurethane intermediate layer with a solvent-free polyurethane adhesive layer slurry and bake until semi-dry to form a solvent-free polyurethane adhesive layer; S4. The base fabric is bonded to the solvent-free polyurethane adhesive layer and dried to obtain a high lightfast polyurethane composite material.

3. The method for preparing the high lightfastness polyurethane composite material according to claim 2, characterized in that, In step S1, the polyurethane surface layer slurry is coated onto the surface of the release paper with a blade gap of 15-25 mils, and then treated at 100-140℃ for 1-2 minutes to obtain the polyurethane surface layer. And / or, in step S2, the polyurethane intermediate layer slurry is coated onto the surface of the polyurethane surface layer with a blade gap of 15-25 mils, and then treated at 100-140℃ for 1-2 minutes to obtain the polyurethane intermediate layer. And / or, in step S3, the solvent-free polyurethane adhesive layer slurry is applied to the surface of the polyurethane intermediate layer with a blade gap of 25-45 mils, and then baked at 80-120℃ for 1-2 minutes to obtain the solvent-free polyurethane adhesive layer. And / or, in step S4, after the base fabric is laminated with the solvent-free polyurethane adhesive layer by laminating 60-100 filaments, it is treated at 125-135℃ for 4-8 minutes to obtain the high lightfastness polyurethane composite material.

4. The method for preparing the high lightfastness polyurethane composite material according to claim 2, characterized in that, It also includes the following steps: S5. Coat the surface of the high lightfast polyurethane composite material with an aqueous polyurethane slurry, and after drying, form a surface treatment layer to obtain the finished high lightfast polyurethane composite material.

5. The method for preparing the high lightfastness polyurethane composite material according to claim 4, characterized in that, The waterborne polyurethane slurry is prepared from the following components in parts by weight: 100 parts waterborne polyurethane, 0.5-1.0 parts yellowing resistance additive, 0.5-1.5 parts leveling agent, and 3-5 parts curing agent. And / or, in step S5, after coating the surface of the high lightfast polyurethane composite material with water-based polyurethane slurry using a roller coating process, the material is treated at 120-160℃ for 3-6 minutes to obtain the finished high lightfast polyurethane composite material.

6. The application of a high lightfast polyurethane composite material as described in claim 1 or a high lightfast polyurethane composite material prepared by any one of claims 2-5 in automotive interiors.

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