Environment-friendly automotive trim artificial leather material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of automotive trim materials, and particularly relates to an environment-friendly automotive trim artificial leather material as well as a preparation method and application thereof. The environment-friendly automotive trim artificial leather material sequentially comprises a waterborne polyurethane coating, a TPO surface layer and a woven fabric base layer from top to bottom. The TPO surface layer is prepared from the following raw materials in parts by weight: 45 to 65 parts of SEBS (Styrene-Ethylene-Butylene-Styrene), 5 to 20 parts of linear low-density polyethylene, 5 to 15 parts of homo-polypropylene, 10 to 30 parts of polyolefin elastomer, 5 to 15 parts of polyacrylonitrile-starch grafted copolymer, 1 to 5 parts of maleic anhydride grafted polypropylene and 4 to 8 parts of color master batch. The high-flexibility SEBS elastomer is adopted as a base material, and the innovative polyacrylonitrile-starch grafted copolymer is introduced and combined with the soft woven fabric base layer to form the composite material, so that the comprehensive performance of the material is enhanced, the content of volatile organic compounds in a vehicle is remarkably reduced, and the environmental protection property is improved. According to the invention, high performance is ensured, and user comfort and environmental friendliness are also ensured.

Description

Technical Field

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

[0002] In the design of automobile interior, in order to achieve good touch and color and grain effects on the surface of each component, such as automobile dashboard, automobile door panel, central armrest, etc., it is generally necessary to laminate or cover the plastic skeleton of such parts with a layer of soft material with certain color and grain. The current mainstream methods include slush molding, manual coating and vacuum adsorption lamination.

[0003] Taking automobile door panels as an example, the soft materials available include slush-molded polyvinyl chloride (PVC), hand-coated PVC and polyolefin thermoplastic elastomer (TPO). Slush-molded PVC has limited mold life and contains small molecules such as halogens and plasticizers, so its environmental performance is poor; although hand-coated PVC provides a softer touch and greater freedom of shape, it also has poor environmental performance due to the harmful ingredients it contains, and cannot meet the green and environmental protection requirements of modern automobile interiors.

[0004] In contrast, TPO materials are formed by vacuum adsorption, which not only has the advantages of recyclability and light weight, but also can stably mass-produce parts with complex shapes, and have the environmentally friendly characteristics of low odor and low VOC emissions, so they are becoming more and more popular. However, TPO materials feel relatively hard, not as soft as PVC, and also have a gap in texture with 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 automobile interior artificial leather material and a preparation method and application thereof.

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

[0008] An environmentally friendly automobile interior artificial leather material 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 dropping acrylonitrile under continuous stirring to carry out a grafting reaction, and filtering, washing and drying after the reaction to obtain the polyacrylonitrile-starch graft copolymer.

[0012] The present invention uses polyacrylonitrile-starch graft copolymer with good environmental benefits, and 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, and 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 method for preparing 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 method for preparing the polyacrylonitrile-starch graft copolymer, preferably, the initiator includes one or more of ammonium persulfate, potassium persulfate, benzoyl peroxide, and azobisisobutyronitrile.

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

[0016] In the method for preparing 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 hours.

[0018] Preferably, 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 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, is green and environmentally friendly, and does not contain unsaturated double bonds, so it has excellent aging resistance. Due to the polybutadiene component, 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 includes 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 strengthen the bonding force between the polyacrylonitrile-starch grafted copolymer and other non-polar polyolefins, thereby ensuring good dispersion and stable microstructure between the components of the composite material.

[0024] Preferably, the masterbatch is a masterbatch with linear low-density polyethylene as the 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 viscosity of the polyurethane thickener is 5000-100000 mPa.s, and the solid content is 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 by the following technical solutions:

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

[0032] S1. Preparing a semi-finished composite material of artificial leather: mixing the raw materials of the TPO skin layer uniformly and then feeding them into an extruder, after melt blending by the screw of the extruder, extruding at the wide die of the extruder to obtain a TPO cast film; laminating the TPO cast film with a woven fabric base layer in a molten state, and then subjecting the film to a corona treatment to obtain a semi-finished composite material of artificial leather 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 and stirring evenly, then adding a polyurethane thickener and stirring evenly to obtain a mixed solution; adding an isocyanate curing agent and stirring evenly to obtain a waterborne polyurethane coating;

[0034] S3, surface coating treatment: coating a water-based polyurethane coating on the surface of the TPO skin layer of the semi-finished artificial leather composite material, and drying to form a water-based polyurethane coating to obtain the environmentally friendly automobile 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 laminating 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 automobile interior artificial leather material further comprises the following steps:

[0042] S4. One side of the TPO surface layer of the environment-friendly automobile 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 environment-friendly automobile interior artificial leather material to obtain a final product, which is an environment-friendly automobile interior artificial leather material with a leather texture.

[0043] Preferably, the texture on the embossing roller is selected according to the texture 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 by the following technical solutions:

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

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

[0048] 1. The present invention provides an environmentally friendly artificial leather material for automobile interior, wherein the TPO surface layer is based on SEBS, which gives the material good elasticity and softness. At the same time, polyacrylonitrile-starch graft copolymer is innovatively introduced, and polyacrylonitrile gives the material high tensile strength and Young's modulus. After combining with starch, the mechanical properties are enhanced, and the flexibility and impact strength are increased. The combined use of SEBS and polyacrylonitrile-starch graft copolymer can further optimize the flexibility and touch of the TPO surface layer, and also improve its aging resistance, significantly improve the comprehensive performance of the TPO surface layer, and ensure the safety of automobile interior.

[0049] 2. The environmentally friendly artificial leather material for automobile interior provided by the present invention provides dual environmental protection guarantees from the perspective of raw materials and preparation methods. The polyacrylonitrile-starch graft copolymer introduced into the composite material has good mechanical properties and biodegradability, and no additional glue-like adhesive substances are added during the hot pressing composite process. The present invention provides additional toughness support on the basis of improving the environmental protection effect, making the material more durable and easy to process. The innovative material of the present invention not only achieves a breakthrough in performance, but also makes contributions to environmental protection, and is an ideal choice for future automobile interior materials.

[0050] 3. The environmentally friendly artificial leather material for automobile interior provided by the present invention adopts SEBS elastomer as the base material to ensure high softness and comfortable hand feel. By introducing polyacrylonitrile-starch graft copolymer, not only the comprehensive performance of the material is enhanced, but also combined with the soft woven base layer to form a composite material. This combination effectively improves the touch of the interior material and reduces the density of the product, meeting the demand for lightweight. In addition, the design of the material helps to significantly reduce the content of volatile organic compounds (VOC) in the car and improves environmental protection. Overall, this innovative material ensures user comfort and environmental friendliness while ensuring high performance.

[0051] 4. The present invention provides a method for preparing an environmentally friendly artificial leather material for automotive interior, which directly combines the TPO surface layer and the woven fabric base layer into a composite material by a one-step extrusion composite method. 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 diverse choices. The 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 It is a structural schematic diagram and a microscopic magnified diagram of the environment-friendly automobile 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 The schematic diagram is a preparation process of the semi-finished composite material of artificial leather of the present invention.

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

[0056] The technical solution of the present invention is further described below in conjunction with specific embodiments and drawings. It should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not used to limit the scope of the present invention. And the drawings used herein are only for better illustrating the disclosed content 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 content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

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

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

[0059] Linear low-density polyethylene: Yanshan Petrochemical LD200BW, MFR at 190℃ / 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℃ / 2.16kg 2.3 g / 10min (test method IS0-1133);

[0061] Polyolefin elastomer: Ethylene-octene dynamic vulcanizate TPV material synthesized using metallocene catalyst, with a Shore hardness of 56A (test method IS0 868), a melting temperature of 112°C, and an MFR of 7.2 g / 10min at 230°C / 2.16kg;

[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 is 150mPa.s, solid content is 40wt%.

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

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

[0068] Figure 1 The structure diagram and microscopic magnification diagram of the environmentally friendly automobile interior artificial leather material of the present invention are shown in the figure: 1. waterborne polyurethane coating; 2. TPO surface layer; 3. woven fabric base layer. Figure 2 The present invention is a schematic diagram of the preparation process of the semi-finished artificial leather composite material. In the figure: 4, extruder A; 5, extruder B; 6, wide-width die; 7, TPO cast film; 8, woven fabric base; 9, semi-finished artificial leather composite material. The molten mixture is extruded from the wide-width die 6 of extruder A 4 and extruder B 5 to form a TPO cast film 7, and is immediately laminated and laminated with the woven fabric base 8 at the three-roll lamination and lamination position at the rear end to obtain the semi-finished artificial leather composite material 9.

[0069] Example 1

[0070] The environment-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. Mix the raw materials of the TPO skin layer evenly and put them into the extruder, heat and melt the components at 210°C and mix them evenly; then extrude the obtained molten mixture into a TPO cast film through the wide die of the extruder, and immediately laminate and laminate with the woven fabric base layer at 5Mpa at the three-roller lamination position at the rear end of the die, and then perform corona treatment through the corona device at the rear end of the line body to prepare a semi-finished composite material of a 0.4mm thick TPO skin layer and a 1.0mm thick woven fabric layer;

[0075] S2, mixing the waterborne polyurethane dispersion, silicon dioxide and water and 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. Two layers of waterborne polyurethane coating with a thickness of 20 μm are evenly coated on one side of the TPO skin layer of the semi-finished composite material by gravure roller printing, and a waterborne polyurethane coating is formed after drying to improve the feel, wear resistance, scratch resistance, chemical resistance and aging properties of the surface layer, thereby obtaining an environmentally friendly automotive interior artificial leather material;

[0077] S4. Take the obtained environment-friendly automobile 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 specified texture at 175°C and 4.5 MPa, and copy the specified texture on the surface of the embossing roller to the surface of the TPO surface layer to obtain the final product of the environment-friendly automobile interior artificial leather material with leather texture.

[0078] Example 2

[0079] The 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 homopolymer polypropylene, 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 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: 45 parts of SEBS, 18 parts of linear low-density polyethylene, 6 parts of homopolypropylene, 25 parts of polyolefin elastomer, 8 parts of polyacrylonitrile-starch graft copolymer, 2 parts of maleic anhydride grafted polypropylene, and 6 parts of masterbatch. The rest is the same as in embodiment 1.

[0082] Comparative Example 1

[0083] The difference between this comparative example and Example 1 is that SEBS is not used in the TPO skin layer, and the TPO skin layer of this example is processed from the following raw materials in parts by weight: 47 parts of linear low-density polyethylene, 35 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. The rest is the same as Example 1.

[0084] Comparative Example 2

[0085] The 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 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 difference between this comparative example and Example 1 is that polyacrylonitrile is used in the TPO skin layer of this example to replace the polyacrylonitrile-starch graft copolymer, and the rest is the same as Example 1.

[0090] Comparative Example 5

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

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

[0093] The peel strength is tested according to IS0 2411;

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

[0095] The tensile strength is tested according to IS0 37;

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

[0097] Tear strength is tested according to IS0 13937-2;

[0098] The odor is tested according to the 500L bag method, and the test steps are as follows: take a test sample with a clean and uncontaminated surface and store it at a temperature of 23°C and a relative humidity of 50%RH for 24 hours; then put the sample into a 500L polyethylene bag and seal the bag to ensure that there is no leakage; place the sealed bag in an aging box and keep it at 65°C for 16 hours; after taking the bag out of the aging box, open the bag immediately, and have trained testers evaluate the odor level according to the odor evaluation system; the odor level is divided into 6 levels, and the evaluation criteria are as follows: 1 = no odor, 2 = slight odor, 3 = odor, but not irritating, 4 = irritating odor, 5 = strong irritating odor, 6 = unbearable odor;

[0099] TVOC was tested using the 2000L bag method. The test steps are as follows: take a test sample with a clean and uncontaminated surface and store it at a temperature of 23°C and a relative humidity of 50%RH for 24 hours; then put the sample into a 2000L polyethylene bag and seal the bag to ensure that there is no leakage; place the sealed bag in an aging box and keep it at 65°C for 16 hours; after taking the bag out of the aging box, collect the air sample in the bag through the sampling port connected to the bag, and use gas chromatography-mass spectrometry (GC-MS) to analyze the TVOC concentration in the collected air sample;

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

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

[0102] .

[0103] As shown in Table 1, it can be seen from Examples 1 to 3 that the automotive interior artificial leather materials prepared using the raw materials within the scope of the technical solution of the present invention all have excellent soft touch (Shore hardness is less than 60A, that is, it has a better soft touch), high dynamic and static tensile properties, and the artificial leather materials can show very good surface touch, and meet the processing requirements of the manual overmolding method of the parts processing factory, reducing the limitation of the TPO-type skin at the processing end due to too small stretching amount; the artificial leather materials of the embodiments all have high peel strength, that is, the force required to tear the TPO skin layer and the fabric base layer is high, and the peel strength directly affects whether the fabric base layer is easy to delaminate during the manual overmolding process of the parts processing factory. The one-step extrusion laminating method adopted by the present invention directly laminates the TPO extruded cast film with the woven fabric base layer in a molten state, which can effectively ensure that the two are closely laminated and ensure the peel strength of the product; at the same time, it can be seen from the odor and TVOC test results that the artificial leather materials of the embodiments all show low odor and VOC levels and have excellent environmental performance. However, the automotive interior artificial leather materials prepared using the raw materials not within the technical solution of the present invention in the comparative examples all have varying degrees of decline in various properties.

[0104] The various aspects, embodiments, and features of the present invention should be considered to be illustrative in all aspects and not limiting of the present invention, 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 claimed invention.

[0105] In the preparation method of the present invention, the order of each step is not limited to the order listed. For those skilled in the art, without creative work, the order of each step is also within the protection scope of the present invention. In addition, two or more steps or actions can be performed simultaneously.

[0106] Finally, it should be noted that the specific embodiments described herein are merely examples of the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art of the present invention may make various modifications or supplements to the specific embodiments described, or replace them in a similar manner. It is not necessary and impossible to provide all examples of all implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the scope of protection of the present invention, and interpreting them as any additional limitation is 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: waterborne polyurethane coating, TPO surface layer, 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 homopolymer polypropylene, 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.

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 automotive interior artificial leather material according to claim 1, characterized in that: 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 dropping acrylonitrile under continuous stirring to carry out a grafting reaction, filtering, washing and drying after the reaction is completed to obtain the polyacrylonitrile-starch graft copolymer.

4. The environmentally friendly automotive interior artificial leather material according to claim 3, 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.

5. The environmentally friendly automobile interior artificial leather material 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 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; 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 polyolefin elastomer includes one or more of a blend of EPDM rubber and polyolefin, ethylene-octene copolymer, and thermoplastic dynamic vulcanized rubber; the melting temperature of the polyolefin elastomer is 160-220° C.; 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 automobile interior artificial leather material 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 automobile interior artificial leather material as claimed in any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: S1. Preparing a semi-finished composite material of artificial leather: mixing the raw materials of the TPO skin layer uniformly and then feeding them into an extruder, after melt blending by the screw of the extruder, extruding at the wide die of the extruder to obtain a TPO cast film; laminating the TPO cast film with a woven fabric base layer in a molten state, and then subjecting the film to a corona treatment to obtain a semi-finished composite material of artificial leather 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 and stirring evenly, then adding a polyurethane thickener and stirring evenly to obtain a mixed solution; adding an isocyanate curing agent and stirring evenly to obtain a waterborne polyurethane coating; S3, surface coating treatment: coating a water-based polyurethane coating on the surface of the TPO skin layer of the semi-finished artificial leather composite material, and drying to form a water-based polyurethane coating to obtain the environmentally friendly automobile interior artificial leather material.

8. The preparation method according to claim 7, characterized in that: In the step S1, a twin-screw extruder is used to extrude a TPO cast film through a common wide-width die; In the step S1, the thickness of the obtained TPO cast film is 0.3-1.0 mm; In the step S1, the temperature of the TPO cast film in the molten state is 145-210° C., and the laminating pressure is 3-8 MPa; In the 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 environment-friendly automobile 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 environment-friendly automobile interior artificial leather material to obtain a final product, which is an environment-friendly automobile interior artificial leather material with a leather texture.

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

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