An environment-friendly artificial leather material for automobile interiors, its preparation method and application

Abstract

The present invention belongs to the technical field of automotive interior materials, and specifically relates to an environmentally friendly automotive interior artificial leather material, a preparation method thereof, and an application thereof. The environmentally friendly automotive interior artificial leather material comprises, from top to bottom, a water-based polyurethane coating, a TPO surface layer, and a woven fabric base layer. The TPO surface layer comprises the following raw materials in parts by weight: 45 to 65 parts of SEBS, 5 to 20 parts of linear low-density polyethylene, 5 to 15 parts of homopolypropylene, 10 to 30 parts of polyolefin elastomer, 5 to 15 parts of polyacrylonitrile-starch graft copolymer, 1 to 5 parts of maleic anhydride grafted polypropylene, and 4 to 8 parts of masterbatch. The present invention adopts a high-softness SEBS elastomer as a base material, introduces an innovative polyacrylonitrile-starch graft copolymer, and combines it with a soft woven fabric base layer to form a composite material, which not only enhances the comprehensive performance of the material, but also significantly reduces the content of volatile organic compounds in the vehicle, thereby improving environmental friendliness. While ensuring high performance, the present invention also ensures user comfort and environmental friendliness.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile interior materials, and particularly relates to an environmentally friendly automobile interior artificial leather material and a preparation method and application thereof. Background Art

[0002] In automotive interior design, to achieve a desired feel, color, and texture on the surfaces of components such as dashboards, door panels, and center armrests, a soft, color- and texture-matching material is typically laminated or coated onto the plastic skeleton of these parts. Current mainstream methods include thermoforming, hand-wrapping, and vacuum lamination.

[0003] Taking automotive door panels as an example, the soft materials available include slush-molded polyvinyl chloride (PVC), hand-coated PVC, and polyolefin thermoplastic elastomers (TPO). Slush-molded PVC has limited mold life and contains small molecules such as halogens and plasticizers, making it less environmentally friendly. While hand-coated PVC offers a softer touch and greater styling freedom, it also contains harmful ingredients, making it less environmentally friendly and unable to meet the green requirements of modern automotive interiors.

[0004] In contrast, TPO materials, which are formed through vacuum adsorption, offer the advantages of recyclability and lightweighting, as well as the ability to consistently mass-produce complex shapes. They are also environmentally friendly, with low odor and low VOC emissions, making them increasingly popular. However, TPO materials have a relatively hard feel, not as soft as PVC and lacking the texture of genuine leather.

[0005] To meet these challenges, the industry is exploring improved TPO formulations and other innovative materials to provide solutions that meet environmental standards and have a feel comparable to traditional materials to meet the evolving needs of the automotive industry. Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides an environmentally friendly automotive interior artificial leather material and a preparation method and application thereof.

[0007] The first object of the present invention is achieved through the following technical solutions:

[0008] An environmentally friendly artificial leather material for automobile interior decoration comprises, from top to bottom, a waterborne polyurethane coating, a TPO surface layer, and a woven fabric base layer.

[0009] Preferably, the thicknesses of the waterborne polyurethane coating, the TPO surface layer, and the woven fabric base layer are 10-100 μm, 0.3-1.0 mm, and 0.4-1.5 mm, respectively.

[0010] Preferably, the TPO skin layer comprises the following raw materials in parts by weight: 45-65 parts of SEBS, 5-20 parts of linear low-density polyethylene, 5-15 parts of homopolypropylene, 10-30 parts of polyolefin elastomer, 5-15 parts of polyacrylonitrile-starch graft copolymer, 1-5 parts of maleic anhydride grafted polypropylene, and 4-8 parts of masterbatch.

[0011] Preferably, the preparation method of the polyacrylonitrile-starch graft copolymer comprises the following steps: dispersing starch in water and heating it until gelatinization, adding an initiator and stirring evenly, then dropwise adding acrylonitrile under continuous stirring to carry out grafting reaction, and after the reaction is completed, filtering, washing and drying to obtain the polyacrylonitrile-starch graft copolymer.

[0012] The present invention uses polyacrylonitrile-starch graft copolymer with good environmental benefits. As a modified starch-based material, it has better biodegradability, thereby reducing the impact on the environment. The starch grafted onto polyacrylonitrile can change the melt fluidity of the material, making it easier to process and shape. Since polyacrylonitrile is a nitrogen-containing natural flame-retardant polymer, it itself has high tensile strength and Young's modulus. After graft copolymerization, it can not only make up for the insufficient strength that may be caused by starch-based materials, but also improve the mechanical properties of the material such as toughness and impact strength, as well as enhance the dimensional stability and life of the composite material. In addition, the addition of an appropriate amount of polyacrylonitrile-starch graft copolymer can reduce the overall cost of the composite material without affecting or even improving the overall performance.

[0013] In the preparation method of the polyacrylonitrile-starch graft copolymer, preferably, starch is dispersed in water and heated at a temperature of 60-90° C. until gelatinization.

[0014] In the preparation method of the polyacrylonitrile-starch graft copolymer, preferably, the initiator includes one or more of ammonium persulfate, potassium persulfate, benzoyl peroxide, and azobisisobutyronitrile.

[0015] In the preparation method of the polyacrylonitrile-starch graft copolymer, preferably, the mass ratio of starch to acrylonitrile is 1:(1-5).

[0016] In the preparation method of the polyacrylonitrile-starch graft copolymer, preferably, the amount of the initiator added is 1-5 wt % of the mass of the starch.

[0017] In the preparation method of the polyacrylonitrile-starch graft copolymer, preferably, the grafting reaction temperature is 50-80° C., and the reaction time is 2-20 h.

[0018] Preferably, the SEBS is a linear triblock copolymer with polystyrene as the terminal segments and an ethylene-butene copolymer obtained by hydrogenating polybutadiene as the middle elastomeric segment. The SEBS has a melt flow rate of 1.5-15 g / 10 min at 230°C / 2.16 kg, a Shore A hardness (15s reading) of 30-50 Shore A, and a styrene content of 10-30 wt%.

[0019] The present invention adopts SEBS as the base material, which has excellent thermoplasticity, can be repeatedly processed, and is green and environmentally friendly; and does not contain unsaturated double bonds, so it has excellent aging resistance; and because it contains polybutadiene components, the finished product has good hand feel and softness and hardness.

[0020] Preferably, the linear low-density polyethylene has a melt flow rate of 1.0-5.0 g / 10 min at 190°C / 2.16 kg and a weight-average molecular weight of (5-50)×10 4 g / mol.

[0021] Preferably, the homopolymer polypropylene has a melt flow rate of 1.5-8.0 g / 10 min at 230°C / 2.16 kg and a weight average molecular weight of (5-15)×10 4 g / mol.

[0022] Preferably, the polyolefin elastomer comprises one or more of a blend of ethylene propylene diene monomer (EPDM) and polyolefin, ethylene-octene copolymer (POE), and thermoplastic vulcanized rubber (TPV). The melting temperature of the polyolefin elastomer is 160-220°C.

[0023] Preferably, the maleic anhydride-grafted polypropylene has a melt flow rate of 60-85 g / 10 min at 190°C / 2.16 kg and a grafting rate of 0.8-1.0 wt%. The use of maleic anhydride-grafted polypropylene can enhance the adhesion between the polyacrylonitrile-starch graft copolymer and other non-polar polyolefins, thereby ensuring good dispersion and a stable microstructure among the composite components.

[0024] Preferably, the masterbatch is a masterbatch using linear low-density polyethylene as a carrier resin.

[0025] Preferably, the woven fabric base layer comprises one or more of 100wt% virgin PET fabric, 100wt% virgin PP fabric, 50-100wt% recycled PET fabric, and 50-100wt% recycled PP fabric.

[0026] Preferably, the waterborne polyurethane coating comprises the following raw materials in parts by weight: 50-80 parts of waterborne polyurethane dispersion, 0.5-2.5 parts of polyurethane thickener, 0.2-0.8 parts of isocyanate curing agent, 30-60 parts of water, and 0.1-0.2 parts of silicon dioxide.

[0027] Preferably, the aqueous polyurethane dispersion has a viscosity of 200-400 mPa·s and a solid content of 20-40 wt %.

[0028] Preferably, the polyurethane thickener has a viscosity of 5000-100000 mPa.s and a solid content of 40-55 wt%.

[0029] Preferably, the viscosity of the isocyanate curing agent is 100-200 mPa.s, and the solid content is 30-45 wt%.

[0030] The second object of the present invention is achieved through the following technical solutions:

[0031] A method for preparing an environmentally friendly artificial leather material for automobile interior decoration, comprising the following steps:

[0032] S1. Preparing an artificial leather semi-finished composite material: uniformly mixing the raw materials for the TPO skin layer and feeding them into an extruder; melt-blending them by the extruder screw and extruding them through a wide die of the extruder to obtain a TPO cast film; laminating the TPO cast film to a woven fabric base layer in a molten state, and then subjecting the film to a corona treatment to obtain an artificial leather semi-finished composite material of the TPO skin layer and the woven fabric base layer;

[0033] S2. Preparing a waterborne polyurethane coating: mixing a waterborne polyurethane dispersion, silicon dioxide, and water, stirring uniformly, then adding a polyurethane thickener and stirring uniformly to obtain a mixed solution; adding an isocyanate curing agent and stirring uniformly to obtain a waterborne polyurethane coating;

[0034] S3. Surface coating treatment: coating a water-based polyurethane coating on the TPO surface of the semi-finished artificial leather composite material, and drying the coating to form a water-based polyurethane coating, thereby obtaining the environmentally friendly automotive interior artificial leather material.

[0035] Preferably, in step S1, a twin-screw extruder is used to extrude the TPO cast film using a common wide-width die.

[0036] Preferably, in step S1, the thickness of the obtained TPO cast film is 0.3-1.0 mm.

[0037] Preferably, in step S1, the temperature of the TPO cast film in a molten state is 145-210° C., and the lamination pressure is 3-8 MPa.

[0038] Preferably, in step S1, the dyne value of the upper surface of the corona-treated TPO skin layer is 40-60 dyne / cm. Corona treatment of the laminated TPO film and woven fabric base composite material can effectively increase the surface polarity of the TPO skin layer.

[0039] Preferably, in step S2, the viscosity of the mixed solution is 100-350 mPa.s.

[0040] Preferably, in step S3, 1 to 3 layers of waterborne polyurethane coating are coated on the surface of the semi-finished artificial leather composite material.

[0041] Preferably, the method for preparing the environmentally friendly automotive interior artificial leather material further comprises the following steps:

[0042] S4. One side of the TPO surface layer of the environmentally friendly automotive interior artificial leather material obtained in step S3 is softened by infrared heating through an embossing line, and is embossed with an embossing roller with a texture, and the texture on the embossing roller is copied to the surface of the environmentally friendly automotive interior artificial leather material to obtain a final product of the environmentally friendly automotive interior artificial leather material with a leather texture.

[0043] Preferably, the patterns on the embossing roller are selected according to the patterns required for the final product.

[0044] Preferably, the infrared heating temperature is 150-220° C., and the laminating pressure is 1.5-8 MPa.

[0045] The third object of the present invention is achieved through the following technical solutions:

[0046] The invention discloses an application of an environmentally friendly automobile interior artificial leather material in the preparation of automobile interior.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] 1. This invention provides an environmentally friendly artificial leather material for automotive interiors. The TPO surface layer is based on SEBS, imparting excellent elasticity and softness. The innovative incorporation of a polyacrylonitrile-starch graft copolymer also imparts high tensile strength and Young's modulus to the material. Combined with starch, the copolymer enhances mechanical properties, increasing flexibility and impact strength. The combination of SEBS and the polyacrylonitrile-starch graft copolymer further optimizes the flexibility and tactile feel of the TPO surface layer, while also improving its aging resistance. This significantly enhances the overall performance of the TPO surface layer, ensuring the safety of automotive interiors.

[0049] 2. The present invention provides an environmentally friendly artificial leather material for automotive interiors, offering dual environmental benefits from both its raw materials and preparation methods. The polyacrylonitrile-starch graft copolymer incorporated into the composite material exhibits excellent mechanical properties and biodegradability, and no additional adhesives such as glue are added during the hot-pressing lamination process. This invention not only enhances environmental performance but also provides additional toughness, making the material more durable and easier to process. This innovative material not only achieves breakthrough performance but also contributes to environmental protection, making it an ideal choice for future automotive interior materials.

[0050] 3. This invention provides an environmentally friendly artificial leather material for automotive interiors. It utilizes SEBS elastomer as its base material, ensuring exceptional softness and a comfortable feel. The introduction of a polyacrylonitrile-starch graft copolymer not only enhances the material's overall performance but also combines with a soft woven fabric base to form a composite material. This combination effectively improves the interior material's tactile feel while reducing its density, meeting lightweighting requirements. Furthermore, the material's design significantly reduces volatile organic compound (VOC) levels in the vehicle interior, enhancing its environmental friendliness. Overall, this innovative material delivers high performance while ensuring user comfort and environmental friendliness.

[0051] 4. The present invention provides a method for preparing an environmentally friendly artificial leather material for automotive interiors, which adopts a one-step extrusion composite method to directly combine the TPO surface layer and the woven fabric base layer into a composite material. This process does not require the addition of any glue-like adhesives, and the final product is completed by surface coating and embossing after hot pressing and laminating. This method not only ensures the soft and comfortable touch of the material, but is also particularly suitable for manual coating processes, can adapt to the trend of personalized design of automotive interior parts, and provide consumers with a variety of choices. This preparation method simplifies the production process, reduces the use of chemical adhesives, reduces VOC emissions, and improves environmental performance. The final TPO artificial leather not only meets the requirements of modern automotive interiors for beauty and functionality, but also responds to the call for environmental protection and sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a structural schematic diagram and a microscopic magnified image of the environmentally friendly automotive interior artificial leather material of the present invention.

[0053] In the figure: 1. Water-based polyurethane coating; 2. TPO surface layer; 3. Woven base layer.

[0054] Figure 2 Schematic diagram of the preparation process of the semi-finished artificial leather composite material of the present invention.

[0055] In the figure: 4, extruder A; 5, extruder B; 6, wide-width die; 7, TPO cast film; 8, woven base; 9, artificial leather semi-finished composite material. DETAILED DESCRIPTION

[0056] The technical solution of the present invention will be further described below in conjunction with specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the scope of the present invention. The drawings used herein are only for the purpose of better illustrating the disclosure of the present invention and do not have a limiting effect on the scope of protection. In addition, it should be understood that after reading the contents taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached hereto.

[0057] The raw material information in the following examples and comparative examples is as follows:

[0058] SEBS: Shore hardness 43A (test method IS0 868), MFR at 230°C / 2.16kg 4.2 g / 10min (test method IS0-1133);

[0059] Linear low-density polyethylene: Yanshan Petrochemical LD200BW, MFR at 190°C / 2.16kg is 1.3 g / 10min (test method IS0-1133);

[0060] Homopolymer polypropylene: Zhenhai Refining and Chemical T30S, Shore hardness 82A (test method IS0 868), MFR at 230°C / 2.16kg 2.3 g / 10min (test method IS0-1133);

[0061] Polyolefin elastomer: Ethylene-octene dynamic vulcanizate (TPV) material synthesized using a metallocene catalyst, with a Shore hardness of 56A (test method ISO 868), a melt temperature of 112°C, and an MFR of 7.2 g / 10 min at 230°C / 2.16 kg;

[0062] Masterbatch: black customized masterbatch;

[0063] Waterborne polyurethane dispersion: viscosity 300 mPa.s, solid content 35wt%;

[0064] Polyurethane thickener: viscosity 5500 mPa.s, solid content 45wt%;

[0065] Isocyanate curing agent: viscosity 150mPa.s, solid content 40wt%.

[0066] The polyacrylonitrile-starch graft copolymer used was prepared by the following preparation method: 100 g of starch was dispersed in 2000 mL of water, heated at 60° C. until gelatinized, and then 2 g of ammonium persulfate was added and stirred evenly; then, stirring was continued at 70° C., and 200 g of acrylonitrile was added dropwise for grafting reaction, and the reaction was stirred at 300 rpm for 12 hours. After the reaction was completed, the polyacrylonitrile-starch graft copolymer was obtained by filtering, washing, and drying.

[0067] The woven fabric base is made of 100wt% PET virgin fabric with a thickness of 1.0mm.

[0068] Figure 1 The following is a schematic diagram and a microscopic magnified image of the structure of the environmentally friendly artificial leather material for automobile interior decoration of the present invention. In the figure: 1. Waterborne polyurethane coating; 2. TPO surface layer; 3. Woven base layer. Figure 2 This is a schematic diagram of the preparation process of the semi-finished artificial leather composite material of the present invention. In the figure: 4, extruder A; 5, extruder B; 6, wide-width die; 7, TPO cast film; 8, woven fabric substrate; 9, semi-finished artificial leather composite material. The molten mixture is extruded through the wide-width die 6 of extruders A 4 and B 5 to form the TPO cast film 7, which is then immediately laminated with the woven fabric substrate 8 at a three-roll lamination station at the rear end to produce the semi-finished artificial leather composite material 9.

[0069] Example 1

[0070] The environmentally friendly artificial leather material for automobile interior decoration of this embodiment comprises, from top to bottom, a water-based polyurethane coating, a TPO surface layer, and a woven fabric base layer.

[0071] The TPO skin layer is made of the following raw materials in parts by weight: 65 parts of SEBS, 9 parts of linear low-density polyethylene, 8 parts of homopolypropylene, 12 parts of polyolefin elastomer, 12 parts of polyacrylonitrile-starch graft copolymer, 4 parts of maleic anhydride grafted polypropylene, and 6 parts of masterbatch.

[0072] The waterborne polyurethane coating is made from the following raw materials in parts by weight: 70 parts of waterborne polyurethane dispersion, 2 parts of polyurethane thickener, 0.6 parts of isocyanate curing agent, 45 parts of water, and 0.1 parts of silicon dioxide.

[0073] The preparation method of the environmentally friendly automobile interior artificial leather material of the present embodiment comprises the following steps:

[0074] S1. The TPO skin layer raw materials were mixed uniformly and then fed into an extruder. The components were heated and melted at 210° C. and mixed uniformly. The resulting molten mixture was then extruded into a TPO cast film through a wide die of the extruder. The film was immediately laminated with a woven fabric base layer at a three-roll lamination position at the rear end of the die under a pressure of 5 MPa. The film was then corona treated by a corona device at the rear end of the line to prepare a semi-finished composite material of a 0.4 mm thick TPO skin layer and a 1.0 mm thick woven fabric layer.

[0075] S2, mixing the aqueous polyurethane dispersion, silicon dioxide and water, stirring evenly, then adding the polyurethane thickener and stirring evenly to obtain a mixed solution with a viscosity of 250 mPa.s; adding the isocyanate curing agent and stirring evenly to obtain a waterborne polyurethane coating;

[0076] S3. Evenly coating one side of the TPO skin layer of the semi-finished composite material with two layers of 20 μm thick water-based polyurethane coating by gravure roller printing, and drying to form a water-based polyurethane coating to improve the surface feel, wear resistance, scratch resistance, chemical resistance, and aging properties, thereby obtaining an environmentally friendly automotive interior artificial leather material;

[0077] S4. Take the obtained environmentally friendly automotive interior artificial leather material, soften one side of its TPO surface layer by infrared heating on an embossing machine, and directly hot-press it with an embossing roller with a specified pattern at 175°C and 4.5 MPa. The specified pattern on the surface of the embossing roller is copied to the surface of the TPO surface layer to obtain the final product of the environmentally friendly automotive interior artificial leather material with a leather texture.

[0078] Example 2

[0079] The only difference between this embodiment and embodiment 1 is that the TPO skin layer of this embodiment is made of the following raw materials in parts by weight: 55 parts of SEBS, 14 parts of linear low-density polyethylene, 8 parts of homopolypropylene, 17 parts of polyolefin elastomer, 10 parts of polyacrylonitrile-starch graft copolymer, 3 parts of maleic anhydride grafted polypropylene, and 6 parts of masterbatch. The rest is the same as in embodiment 1.

[0080] Example 3

[0081] The only difference between this embodiment and Example 1 is that the TPO skin layer of this embodiment is made from the following raw materials in parts by weight: 45 parts SEBS, 18 parts linear low-density polyethylene, 6 parts homopolypropylene, 25 parts polyolefin elastomer, 8 parts polyacrylonitrile-starch graft copolymer, 2 parts maleic anhydride grafted polypropylene, and 6 parts masterbatch. The remaining ingredients are the same as in Example 1.

[0082] Comparative Example 1

[0083] This comparative example differs from Example 1 only in that SEBS is not used in the TPO skin layer. The TPO skin layer of this example is made from the following raw materials in parts by weight: 47 parts linear low-density polyethylene, 35 parts homopolypropylene, 12 parts polyolefin elastomer, 12 parts polyacrylonitrile-starch graft copolymer, 4 parts maleic anhydride grafted polypropylene, and 6 parts masterbatch. The remaining components are the same as in Example 1.

[0084] Comparative Example 2

[0085] The only difference between this comparative example and Example 1 is that no polyacrylonitrile-starch graft copolymer is added to the TPO skin layer of this example, and the rest is the same as Example 1.

[0086] Comparative Example 3

[0087] The only difference between this comparative example and Example 1 is that maleic anhydride grafted polypropylene is not added to the TPO skin layer of this example, and the rest is the same as Example 1.

[0088] Comparative Example 4

[0089] The only difference between this comparative example and Example 1 is that polyacrylonitrile is used in the TPO skin layer of this example instead of polyacrylonitrile-starch graft copolymer, and the rest is the same as Example 1.

[0090] Comparative Example 5

[0091] The only difference between this comparative example and Example 1 is that starch is used in place of polyacrylonitrile-starch graft copolymer in the TPO skin layer of this example, and the rest is the same as Example 1.

[0092] The automotive interior artificial leather materials prepared in the above examples and comparative examples were subjected to relevant performance tests, and the specific test standards are as follows:

[0093] Peel strength is tested according to ISO 2411;

[0094] Shore hardness is tested according to IS0 868;

[0095] The tensile strength is tested according to ISO 37;

[0096] The elongation under constant load is tested according to GM3211;

[0097] Tear strength is tested according to ISO 13937-2;

[0098] Odor testing is conducted using the 500L bag method. The test steps are as follows: a clean and uncontaminated test sample is stored at 23°C and 50% relative humidity for 24 hours. The sample is then placed in a 500L polyethylene bag and sealed to ensure no leakage. The sealed bag is placed in an aging chamber at 65°C for 16 hours. After removing the bag from the aging chamber, it is immediately opened and the odor level is assessed by trained testers using an odor evaluation system. The odor level is divided into 6 levels, with the following evaluation criteria: 1 = no odor, 2 = slight odor, 3 = odor but not irritating, 4 = irritating odor, 5 = strong irritating odor, and 6 = unbearable odor.

[0099] TVOC is tested using the 2000L bag method. The test steps are as follows: a clean, uncontaminated test sample is stored at 23°C and 50% relative humidity for 24 hours. The sample is then placed in a 2000L polyethylene bag and the bag is sealed to ensure no leaks. The sealed bag is placed in an aging chamber at 65°C for 16 hours. After removing the bag from the aging chamber, an air sample is collected from the bag through a sampling port connected to the bag. The TVOC concentration in the collected air sample is analyzed using a gas chromatography-mass spectrometer (GC-MS).

[0100] The specific test results are shown in Table 1.

[0101] Table 1 Performance test data of examples and comparative examples

[0102] .

[0103] As shown in Table 1, Examples 1-3 demonstrate that the automotive interior artificial leather materials prepared using raw materials within the scope of the present invention all exhibit excellent soft touch (a Shore hardness below 60A indicates an excellent soft touch) and high dynamic and static tensile strength. These artificial leather materials exhibit excellent surface tactility and meet the processing requirements of parts manufacturers for manual overmolding, reducing the processing limitations of TPO-based skins due to insufficient stretchability. The artificial leather materials in these examples all exhibit high peel strength, meaning the force required to separate the TPO skin layer from the fabric base layer is high. This peel strength directly affects the likelihood of fabric base layer delamination during manual overmolding at the parts manufacturer. The one-step extrusion lamination method employed in this invention directly laminates the molten TPO extruded cast film to the fabric base layer, effectively ensuring a close bond and ensuring the product's peel strength. Furthermore, odor and TVOC testing demonstrate that the artificial leather materials in these examples exhibit low odor and VOC levels, demonstrating excellent environmental performance. However, the automotive interior artificial leather materials prepared in the comparative examples using raw materials not within the scope of the technical solution of the present invention have various properties that have declined to varying degrees.

[0104] The various aspects, embodiments, and features of the present invention should be considered in all respects as illustrative and not limiting, the scope of which is defined solely by the claims. Other embodiments, modifications, and uses will be apparent to those skilled in the art without departing from the spirit and scope of the invention as claimed.

[0105] In the preparation method of the present invention, the order of the steps is not limited to the order listed. Persons skilled in the art will appreciate that variations in the order of the steps are within the scope of the present invention without inventive effort. Furthermore, two or more steps or actions may be performed simultaneously.

[0106] Finally, it should be noted that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit its implementation. Persons skilled in the art may make various modifications, additions, or substitute similar methods for the described specific embodiments. It is not necessary and impossible to provide comprehensive examples of all implementations here. However, obvious variations or modifications arising from the essential spirit of the present invention remain within the scope of protection of the present invention, and interpreting them as any additional limitations would be contrary to the spirit of the present invention.

Claims

1. An environmentally friendly automotive interior artificial leather material, characterized in that: It includes, from top to bottom: water-based polyurethane coating, TPO surface layer, and woven fabric base layer; The TPO skin layer comprises the following raw materials in parts by weight: 45-65 parts of SEBS, 5-20 parts of linear low-density polyethylene, 5-15 parts of homopolypropylene, 10-30 parts of polyolefin elastomer, 5-15 parts of polyacrylonitrile-starch graft copolymer, 1-5 parts of maleic anhydride grafted polypropylene, and 4-8 parts of masterbatch; The preparation method of the polyacrylonitrile-starch graft copolymer comprises the following steps: dispersing starch in water, heating until gelatinization, adding an initiator and stirring evenly, then dropwise adding acrylonitrile under continuous stirring to carry out a grafting reaction, filtering, washing, and drying after the reaction to obtain the polyacrylonitrile-starch graft copolymer; The polyolefin elastomer includes one or more of a blend of EPDM rubber and polyolefin and an ethylene-octene copolymer; and the melting temperature of the polyolefin elastomer is 160-220°C.

2. The environmentally friendly automotive interior artificial leather material according to claim 1, characterized in that: The thicknesses of the waterborne polyurethane coating, the TPO surface layer, and the woven fabric base layer are 10-100 μm, 0.3-1.0 mm, and 0.4-1.5 mm, respectively.

3. The environmentally friendly artificial leather material for automobile interior according to claim 1, characterized in that: The starch is dispersed in water and heated at 60-90° C. until gelatinized; The initiator includes one or more of ammonium persulfate, potassium persulfate, benzoyl peroxide, and azobisisobutyronitrile; The mass ratio of starch to acrylonitrile is 1:(1-5); The amount of the initiator added is 1-5wt% of the starch mass; The grafting reaction temperature is 50-80° C., and the reaction time is 2-20 hours.

4. The environmentally friendly artificial leather material for automobile interior decoration according to claim 1, characterized in that: The SEBS is a linear triblock copolymer with polystyrene as the terminal segment and ethylene-butene copolymer obtained by hydrogenating polybutadiene as the middle elastic block; the SEBS has a melt flow rate of 1.5-15 g / 10 min at 230° C. / 2.16 kg, a Shore A hardness of 30-50 Shore A, and a styrene content of 10-30 wt%; The linear low-density polyethylene has a melt flow rate of 1.0-5.0 g / 10 min at 190°C / 2.16 kg and a weight-average molecular weight of (5-50)×10 4 g / mol.

5. The environmentally friendly artificial leather material for automobile interior according to claim 1, characterized in that: The homopolymer polypropylene has a melt flow rate of 1.5-8.0 g / 10 min at 230°C / 2.16 kg and a weight average molecular weight of (5-15)×10 4 g / mol; The maleic anhydride grafted polypropylene has a melt flow rate of 60-85 g / 10 min at 190° C. / 2.16 kg and a grafting rate of 0.8-1.0 wt %. The masterbatch is a masterbatch using linear low-density polyethylene as a carrier resin.

6. The environmentally friendly artificial leather material for automobile interior decoration according to claim 1, characterized in that: The woven fabric base layer includes one or more of 100wt% virgin PET woven fabric, 100wt% virgin PP woven fabric, 50-100wt% recycled PET woven fabric, and 50-100wt% recycled PP woven fabric; The waterborne polyurethane coating comprises the following raw materials in parts by weight: 50-80 parts of waterborne polyurethane dispersion, 0.5-2.5 parts of polyurethane thickener, 0.2-0.8 parts of isocyanate curing agent, 30-60 parts of water, and 0.1-0.2 parts of silicon dioxide.

7. A method for preparing an environmentally friendly automotive interior artificial leather material according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: S1. Preparing an artificial leather semi-finished composite material: uniformly mixing the raw materials for the TPO skin layer and feeding them into an extruder; melt-blending them by the extruder screw and extruding them through a wide die of the extruder to obtain a TPO cast film; laminating the TPO cast film to a woven fabric base layer in a molten state, and then subjecting the film to a corona treatment to obtain an artificial leather semi-finished composite material of the TPO skin layer and the woven fabric base layer; S2. Preparing a waterborne polyurethane coating: mixing a waterborne polyurethane dispersion, silicon dioxide, and water, stirring uniformly, then adding a polyurethane thickener and stirring uniformly to obtain a mixed solution; adding an isocyanate curing agent and stirring uniformly to obtain a waterborne polyurethane coating; S3. Surface coating treatment: coating a water-based polyurethane coating on the TPO surface of the semi-finished artificial leather composite material, and drying the coating to form a water-based polyurethane coating, thereby obtaining the environmentally friendly automotive interior artificial leather material.

8. The preparation method according to claim 7, characterized in that In step S1, a twin-screw extruder is used to extrude a TPO cast film through a shared wide die; In step S1, the thickness of the obtained TPO cast film is 0.3-1.0 mm; In step S1, the temperature of the TPO cast film in the molten state is 145-210° C., and the lamination pressure is 3-8 MPa; In step S1, the dyne value of the upper surface of the TPO skin layer after corona treatment is 40-60 dyne / cm; In step S2, the viscosity of the mixed solution is 100-350 mPa.s; In the step S3, 1 to 3 layers of waterborne polyurethane coating are coated on the surface of the semi-finished artificial leather composite material.

9. The preparation method according to claim 7, characterized in that The preparation method further comprises the following steps: S4. One side of the TPO surface layer of the environmentally friendly automotive interior artificial leather material obtained in step S3 is softened by infrared heating through an embossing line, and is embossed with an embossing roller with a texture, and the texture on the embossing roller is copied to the surface of the environmentally friendly automotive interior artificial leather material to obtain a final product of the environmentally friendly automotive interior artificial leather material with a leather texture.

10. Use of the environmentally friendly artificial leather material for automobile interior according to any one of claims 1 to 6 in preparing automobile interior.

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