Soft environment-friendly automotive interior leather

Abstract

The invention provides soft environment-friendly automobile interior leather, which comprises a polyolefin base material layer and a surface coating, the polyolefin base material layer comprises: a component (A): a mixture composed of 10-90 parts by weight of an ethylene copolymer elastomer and 10-90 parts by weight of ethylene-propylene-diene monomer, the sum of the weight parts of the ethylene copolymer elastomer and the ethylene-propylene-diene monomer being 100; and a component (B): 0-5 parts by weight of an assistant cross-linking agent. The automotive trim leather provided by the invention is soft, anti-aging and low-volatility, has good tensile strength, low-temperature folding resistance and flexibility, and is wide in processing window, simple in process and low in cost.

Description

Technical Field

[0001] The invention relates to the field of automobile interior leather, and in particular to soft and environment-friendly automobile interior leather. Background Art

[0002] Automotive interior leather is mainly used in automotive seats, automotive door panels, automotive dashboards, etc. There are many types of automotive interior leather, such as polyvinyl chloride artificial leather (PVC artificial leather), thermoplastic polyolefin artificial leather (TPO artificial leather), polyurethane artificial leather (PU artificial leather), etc. With the continuous development of the automotive industry, automotive interior leather needs to have functionality, comfort, safety and environmental protection performance.

[0003] At present, in the production of PVC artificial leather, the amount of plasticizer added exceeds 30%. Plasticizer is a small molecule. As time goes by, plasticizer migrates on the surface of PVC artificial leather, causing the material to become hard and brittle. It is easy to crack the surface when it is damaged and fatigued, especially at low temperatures, which aggravates brittleness. In the production process of PU synthetic leather, organic solvent-based PU resin is used as the basic raw material for the base and surface layers of leather products. Organic solvents such as butanone, acetone and dimethylformamide have considerable toxic side effects. Whether it is PU synthetic leather or PVC artificial leather, there are certain environmental pollution or product safety issues.

[0004] TPO used in automotive interior leather generally refers to a mixture of polyethylene, polypropylene, and elastomers. It is a rubber-plastic blended thermoplastic elastomer, in which polyethylene and polypropylene are linear structures, and the elastomer has a certain degree of cross-linking, which is a three-dimensional network structure. The elastomer is dispersed in the mixture of polyethylene and polypropylene in a particle state to form an island structure. The cross-linked three-dimensional elastomer provides mechanical strength, and the linear polyethylene and polypropylene provide thermoplasticity. However, since the system contains polypropylene components, the TPO mixture has a certain degree of crystallinity, which makes it less flexible and produces the problem of low-temperature folding resistance. The high melting point of the polypropylene component (greater than 100°C) leads to high processing temperatures and a narrow processing temperature window. In addition, due to the presence of cross-linked elastomers in the system, the embossing retention is poor, so TPO embossing usually requires a deep drawing process, and the cost of replacing the mold is high.

[0005] Therefore, it is necessary to develop an automotive interior leather that is environmentally friendly, soft, has good low-temperature folding resistance, and is easy to process. Summary of the invention

[0006] The invention provides a soft environmentally friendly automobile interior leather, comprising a polyolefin substrate layer and a surface coating, wherein the polyolefin substrate layer comprises: component (A): a mixture of 10 to 90 parts by weight of an ethylene copolymer elastomer and 10 to 90 parts by weight of ethylene propylene diene monomer rubber, wherein the sum of the weight parts of the ethylene copolymer elastomer and the ethylene propylene diene monomer rubber is 100 parts; and component (B): 0 to 5 parts by weight of a cross-linking aid.

[0007] Preferably, the ethylene copolymer elastomer is copolymerized by ethylene and another monomer, and the other monomer is selected from one of C4-C8 carbon chain alpha olefins or vinyl acetate.

[0008] Preferably, the other monomer is vinyl acetate, and the content of vinyl acetate in the ethylene copolymer elastomer is not less than 10 wt % and not more than 40 wt %.

[0009] Preferably, the ethylene copolymer elastomer has a melting point of less than 90°C and a Shore A hardness of less than 80.

[0010] Preferably, the EPDM rubber is a copolymer of ethylene, propylene and a small amount of non-conjugated diene, and the content of the non-conjugated diene in the EPDM rubber is not less than 5%.

[0011] Preferably, the non-conjugated diene includes one of ethylidene norbornene, dicyclopentadiene, and 1,4-hexadiene.

[0012] Preferably, component (B) is selected from one or more of triallyl isocyanurate, triallyl cyanurate, glycidyl (meth)acrylate, methyl (meth)acrylate, trimethylolpropane trimethacrylate, propoxylated glycerol triacrylate, 2-carboxyethyl acrylate, isobornyl (meth)acrylate, 2-hydroxyethyl methacrylate phosphate and tripropylene glycol acrylate.

[0013] Preferably, the soft environmentally friendly automobile interior leather has a cross-linking degree of at least 40%, and the cross-linking method is electron beam irradiation cross-linking.

[0014] Preferably, the soft environmentally friendly automobile interior leather contains a phosphonate-based or hindered phenol-based antioxidant.

[0015] Preferably, the soft environmentally friendly automobile interior leather contains an inorganic metal oxide.

[0016] Preferably, the soft environmentally friendly automobile interior leather contains a flame retardant.

[0017] The present invention also proposes a method for preparing soft environmentally friendly automobile interior leather, comprising the following steps:

[0018] (1) fully mixing component (A), component (B), an antioxidant, a metal oxide, a flame retardant and other additives to obtain a mixture;

[0019] (2) adding the mixture into an extruder at an extrusion temperature of 50 to 130° C., extruding through a T-shaped flat die to form a film, and winding to obtain a film material;

[0020] (3) irradiating the film obtained in step (2) with β rays or X-rays, with a radiation dose of 10 to 100 KGY;

[0021] (4) Applying a coating to the film material irradiated in step (3) and drying it.

[0022] The present invention also proposes a method for preparing soft environmentally friendly automobile interior leather, comprising the following steps:

[0023] (1) fully mixing component (A), component (B), an antioxidant, a metal oxide, a flame retardant and other additives to obtain a mixture;

[0024] (2) adding the mixture obtained in step (1) into an extruder at an extrusion temperature of 70 to 130° C., extruding and casting the mixture onto a fabric base fabric through a T-shaped flat die, and winding the mixture to obtain a film material;

[0025] (3) irradiating the film obtained in step (2) with β rays or X-rays, with a radiation dose of 10 to 100 KGY;

[0026] (4) Applying a coating to the film material irradiated in step (3) and drying it.

[0027] The present invention also proposes a method for preparing soft environmentally friendly automobile interior leather, comprising the following steps:

[0028] (1) fully mixing component (A), component (B), an antioxidant, a metal oxide, a flame retardant and other additives to obtain a mixture;

[0029] (2) adding the mixture obtained in step (1) into an extruder at an extrusion temperature of 70 to 130° C., extruding and casting the mixture onto a fabric base fabric through a T-shaped flat die, and winding the mixture to obtain a film material;

[0030] (3) coating the film material obtained in step (2) and drying it;

[0031] (4) embossing the film material obtained in step (3);

[0032] (5) The embossed film obtained in step (4) is subjected to β-ray irradiation, with a radiation dose of 10 to 100 KGY.

[0033] The present application includes at least one of the following beneficial technical effects:

[0034] The environmentally friendly leather formula system provided by the present invention does not contain plasticizers or solvents, thus avoiding the volatilization of small molecular substances in the raw materials and having low VOC.

[0035] It is formed by blending ethylene copolymer elastomer and uncrosslinked EPDM rubber, both of which are thermoplastic polyolefin elastomers with linear structure and easy processing. The extrusion or cast molding temperature is between 50 and 130°C, the processing temperature is low and the processing window is wide.

[0036] The system of ethylene copolymer elastomer and EPDM rubber blend is adopted. The ethylene copolymer elastomer is used as the soft segment in the polymer system. The double bonds contained in the EPDM rubber structure can be used as radiation cross-linking active points. After radiation cross-linking, a three-dimensional network structure is formed, which provides the strength and weather resistance required by automotive interior leather. In order to ensure the performance of the material, the monomers of the raw materials are selected. In the improved scheme, the density of double bonds and the carbon chain length of the monomers are further limited to achieve ideal performance. After the film material is extruded or cast, radiation cross-linking is carried out to strengthen the mechanical properties of the leather material. The auxiliary cross-linking agent plays a role in increasing the cross-linking density and accelerating the cross-linking speed during the radiation process. In addition, the film material can be selectively embossed after forming. The film material before cross-linking is a linear structure, which is easy to emboss. After embossing, radiation cross-linking is carried out, and the film material forms a three-dimensional structure, which improves the embossing retention.

[0037] The automobile interior leather provided by the invention is soft, aging-resistant, low-volatile, has good tensile strength, low-temperature folding resistance and stretchability, and has a wide processing window, simple process and low cost. DETAILED DESCRIPTION

[0038] In order to make the invention purpose, technical scheme and beneficial technical effect of the present invention clearer, the present invention is described in detail below in conjunction with specific embodiments. It should be understood that the embodiments described in this specification are only for explaining the present invention, not for limiting the present invention.

[0039] For simplicity, only some numerical ranges are explicitly disclosed herein. However, any lower limit can be combined with any upper limit to form an unambiguous range; and any lower limit can be combined with other lower limits to form an unambiguous range, and any upper limit can be combined with any other upper limit to form an unambiguous range. In addition, although not explicitly stated, each point or single value between the range endpoints is included in the range. Thus, each point or single value can be combined with any other point or single value as its own lower limit or upper limit or with other lower limits or upper limits to form an unambiguous range.

[0040] In the description of this article, it should be noted that, unless otherwise specified, “above” and “below” are inclusive of the number, and “multiple” in “one or more” means more than two.

[0041] The above summary of the invention of the present invention is not intended to describe each disclosed embodiment or each implementation in the present invention. The following description more specifically illustrates exemplary embodiments. In many places throughout the application, guidance is provided by a series of examples, which can be used in various combinations. In each embodiment, enumeration is only used as a representative group and should not be interpreted as exhaustive.

[0042] The invention provides a soft environmentally friendly automobile interior leather, comprising a surface coating and a polyolefin substrate layer, wherein the polyolefin substrate layer comprises: 100 parts by weight of component (A): a mixture of 10 to 90 parts of an ethylene copolymer elastomer and 10 to 90 parts of ethylene propylene diene monomer rubber; and 0 to 5 parts by weight of component (B): a cross-linking aid.

[0043] In the automotive interior leather of the present invention, the coating can be a coating material for leather known in the art, including one or more of polyurethane coatings, acrylates or silicone coatings. The automotive interior coating generally has suitable wear resistance, brightness and adhesion, etc., and those skilled in the art can select according to actual needs.

[0044] The automotive interior leather provided by the present invention uses polyolefin as a substrate. The price of polyolefin materials is relatively low, and at the same time, it has a relatively low melting point (melting point range is, for example, 30 to 180°C, or 30 to 160°C) and softness (Shore A hardness is, for example, 20 to 98). Using polyolefin as a substrate improves the softness of the automotive interior leather. In addition, the amount of odorous volatiles produced by polyolefin is very small. Compared with solvent-based PU automotive interior leather and PVC automotive interior leather with added plasticizer, the automotive interior leather produced by it has a lower odor, and the production process has better environmental protection performance, so that it can meet occasions with higher odor and environmental protection requirements.

[0045] The ethylene copolymer elastomer in the polyolefin substrate layer component (A) is copolymerized by ethylene and another monomer, and the other monomer is selected from one of α-olefins with a carbon chain length of C4 to C8 or vinyl acetate.

[0046] The carbon chain length will affect the glass transition temperature, softness, mechanical properties and processing properties of the polymer. In the copolymer formed with ethylene, the longer the carbon chain of the alpha olefin is, the lower the glass transition temperature is, and the low-temperature folding resistance and polymer softness are improved accordingly, but at the same time, the mechanical strength such as tear strength and tensile strength will decrease accordingly. The cross-linking reaction can improve the mechanical strength, but at the same time reduce the softness and scalability. Based on the balance of the above properties, the alpha olefin of carbon C4 to C8 is selected as another comonomer of component (A).

[0047] Vinyl acetate can also be selected as another monomer of the ethylene copolymer elastomer in component (A). The higher the content of vinyl acetate in the ethylene copolymer elastomer, the better the polymer fluidity and the higher the softness. The ester unit in the vinyl acetate structure can be used as a crosslinking point during the radiation crosslinking process to form a body structure. Too little ester unit content will result in high hardness of the leather product and few crosslinkable active points during the crosslinking reaction; too high ester unit content will cause product deformation due to high fluidity, and too many crosslinking points during the crosslinking process will lead to excessive crosslinking and increased hardness. According to the performance requirements of automotive interior leather products, the vinyl acetate monomer content is selected to be within the range of 10 to 40% of the ethylene copolymer elastomer.

[0048] The composition of the polyolefin substrate layer component (A) contains EPDM rubber, which can improve the processing performance and film-forming performance of the polyolefin substrate. EPDM rubber is a copolymer of ethylene, propylene and a third monomer, and the third monomer has a non-conjugated diene structure. The EPDM rubber contains carbon-carbon double bonds that can participate in the polymerization reaction, providing cross-linking active points for the radiation cross-linking reaction. Non-conjugated dienes include ethylidene norbornene, dicyclopentadiene, and 1,4-hexadiene, preferably ethylidene norbornene; using EPDM rubber with an appropriate content of non-conjugated dienes is helpful to improve the cross-linking density and cross-linking speed of the polyolefin substrate, and the content of non-conjugated dienes in EPDM rubber greater than 5% can provide component (A) with sufficient cross-linking density and cross-linking speed.

[0049] The polyolefin substrate layer also includes a component (B) cross-linking agent. The cross-linking agent can improve the cross-linking degree of the polyolefin layer. The amount of the cross-linking agent added can be adjusted according to actual conditions. In some embodiments, based on 100 parts by weight of component (A), the polyolefin substrate layer also includes 0 to 5 parts of the cross-linking agent.

[0050] Examples of the auxiliary cross-linking agent include one or more of diallylamine, diallyl sulfide, N,N-dimethyl-bisacrylamide, ethylene glycol dimethacrylate, triallyl cyanurate, triallyl isocyanurate, trimethylolpropane trimethacrylate, tetramethylolmethane tetraacrylate, glycidyl (meth)acrylate, methyl (meth)acrylate, propoxylated glycerol triacrylate, 2-carboxyethyl acrylate, isobornyl (meth)acrylate, 2-hydroxyethyl methacrylate phosphate, and tripropylene glycol acrylate.

[0051] The production process of the polyolefin substrate layer is extrusion molding or casting, and its processing technology is related to the melting point of the polymer. In the production process of automotive interior leather, it is preferred that the melting point of component (A) is less than 90 degrees; and the Shore hardness A is less than 80.

[0052] The polyolefin substrate layer has a cross-linking degree greater than 40%, and the cross-linking method is electron beam irradiation cross-linking.

[0053] In some embodiments, other additives may be optionally added during the preparation of the automotive interior leather, such as colorants, fillers, and the like.

[0054] In some embodiments, the automotive interior leather contains a phosphonate-based or hindered phenol-based antioxidant.

[0055] In some embodiments, the automotive interior leather contains an inorganic metal oxide, preferably zinc oxide.

[0056] In some embodiments, the automotive interior leather contains a flame retardant.

[0057] In some embodiments, component (A), component (B), antioxidant, metal oxide, flame retardant and other additives are fully mixed to obtain a mixture; the mixture is added to an extruder at an extrusion temperature of 50 to 130° C., extruded through a T-shaped flat die to form a film, and rolled to obtain a film material;

[0058] In some embodiments, the mixture is added to an extruder at an extrusion temperature of 70 to 130°C, extruded through a T-shaped flat die and cast onto a fabric base cloth, and then rolled up to obtain a film material; in order to allow the polyolefin substrate to be better bonded to the base cloth by casting and to increase the permeability of the polymer to the base cloth in a molten state, the extrusion temperature of the mixture bonded to the base cloth needs to be 10 to 20°C higher than the extrusion temperature of the mixture not bonded to the base cloth.

[0059] In some embodiments, the automotive interior leather can be subjected to radiation cross-linking. This allows the polyolefin layer to have the desired degree of cross-linking, i.e., the polyolefin layer is a radiation-cross-linked polyolefin layer. Alpha rays, beta rays, gamma rays, X-rays, or neutron rays can be used for radiation cross-linking. It is easier to control the degree of cross-linking using electron beam radiation cross-linking, and the cross-linking process is more environmentally friendly. During radiation cross-linking, the film structure itself has no physical contact with the radiation generating device, and the shape of the film structure does not change before and after the reaction, but a cross-linking reaction has occurred inside it. As an example, beta rays (i.e., high-energy electron beams) can be used for radiation cross-linking. The radiation dose can be selected from 10KGy to 100KGy, 20KGy to 80KGy, or 50KGy to 100KGy, etc.

[0060] In some embodiments, before the cross-linking step, a surface texture treatment step may be further included. In the surface texture treatment step, the automotive interior leather may be subjected to surface texture treatment to form the desired texture. Thereafter, a cross-linking step is performed to obtain an automotive interior leather having surface texture. Thus, an automotive interior leather product having texture and a three-dimensional style may be obtained.

[0061] In some embodiments, the surface texture treatment step may include: vacuum forming, hot roller hot pressing or cold roller cold pressing to transfer the texture of the mold to the surface of the automotive interior leather. The aforementioned forming can be performed using a vacuum forming machine; the aforementioned hot pressing or cold pressing can be performed using an embossing machine. In the hot roller hot pressing method, the temperature of the hot roller can be equal to or slightly lower than the melting temperature of the polyolefin layer resin. Furthermore, the automotive interior leather with surface texture treatment can obtain good pattern retention after undergoing a subsequent cross-linking step.

[0062] Example

[0063] The following examples more specifically describe the disclosure of the present invention, which are intended for illustrative purposes only, as it will be apparent to those skilled in the art that various modifications and variations may be made within the scope of the disclosure. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are by weight, and the reagents and instruments used in the examples are commercially available.

[0064] The raw materials for the substrate layer used in the following examples are selected from Table 1:

[0065] Table 1 Raw material grades and related properties used in the examples

[0066]

[0067]

[0068] In addition to the above raw materials, the substrate layer also contains 0.5 parts of hindered phenol antioxidant and 15 parts of phosphorus and nitrogen flame retardant.

[0069] The leather samples prepared in the examples were tested for performance as follows:

[0070] Tensile strength and elongation at break: GB / T 1040.1-2006 "Determination of tensile properties of plastics"

[0071] Tear strength: GB / T 16578.1-2008 "Plastic film and sheeting - Determination of tear resistance"

[0072] Heat aging resistance: QBYDQ-A1901.402.2-2017 "Test methods for chemical properties of automotive interior and exterior trim"

[0073] Cross-linking degree: Detected by xylene extraction method in 5.5.3 of GB / T29848-2018 "Ethylene-vinyl acetate copolymer (EVA) adhesive film for photovoltaic module encapsulation";

[0074] Softness: QB / T 5155-2017 "Test methods for artificial leather and synthetic leather - Determination of softness"

[0075] Low temperature folding fastness (-20℃ 30,000 times): QB-T 2714-2005 "Physical and mechanical tests on leather - Determination of folding fastness"

[0076] Examples 1 to 10

[0077] The automobile interior leather in Examples 1 to 3 comprises a polyurethane surface coating and a polyolefin substrate layer, wherein the polyolefin substrate layer comprises: EVA resin and EPDM rubber, a co-crosslinking agent triallyl isocyanurate, zinc oxide and other additives.

[0078] The automotive interior leather in Examples 4 to 10 includes a polyurethane surface coating and a polyolefin substrate layer. The polyolefin substrate layer includes: POE resin and EPDM rubber, zinc oxide and other additives. The specific types and proportions are shown in Table 2:

[0079] Table 2 Types and ratios of components of the polyolefin substrate layer in Examples 1-10

[0080]

[0081] Preparation Examples 1 to 10

[0082] Preparation Examples 1 to 10 are prepared using the structures and components of the automotive interior leather in Examples 1 to 10, and the specific methods are as follows:

[0083] (1) EVA or POE, EPDM rubber, a cross-linking agent, a metal oxide, and other additives are fully mixed to obtain a mixture;

[0084] (2) adding the mixture into an extruder at an extrusion temperature of 100° C., extruding through a T-shaped flat die to form a film, and winding to obtain a film material;

[0085] (3) β-ray irradiation is performed on the film material obtained in step (2), the irradiation dose of Example 1 is 30 KGY, the irradiation dose of Example 2 is 10 KGY, and the irradiation dose of Examples 3 to 10 is 60 KGY;

[0086] (4) Applying a coating to the film material irradiated in step (3) and drying it.

[0087] Preparation Examples 11 to 14

[0088] The difference between Preparation Examples 11 to 14 and Preparation Example 7 is that different irradiation doses are used in the preparation process. Preparation Examples 11 to 14 use irradiation doses of 10 KGY, 30 KGY, 80 KGY, and 100 KGY, respectively.

[0089] Preparation Example 15

[0090] Preparation Example 15 is prepared using the structure and components of the automotive interior leather in Example 7, and the specific method is as follows:

[0091] (1) EVA or POE, EPDM rubber, a cross-linking agent, and a metal oxide are fully mixed to obtain a mixture;

[0092] (2) adding the mixture obtained in step (1) into an extruder at an extrusion temperature of 130° C., extruding and casting onto a fabric base fabric through a T-shaped flat die, and winding to obtain a film material;

[0093] (3) irradiating the film obtained in step (2) with β rays at a radiation dose of 60 KGY;

[0094] (4) Applying a coating to the film material irradiated in step (3) and drying it.

[0095] Preparation Example 16

[0096] Preparation Example 16 was prepared using the structure and components of the automotive interior leather in Example 7, and the specific method is as follows:

[0097] (1) EVA or POE, EPDM rubber, a cross-linking agent, and a metal oxide are fully mixed to obtain a mixture;

[0098] (2) adding the mixture obtained in step (1) into an extruder at an extrusion temperature of 130° C., extruding and casting onto a fabric base fabric through a T-shaped flat die, and winding to obtain a film material;

[0099] (3) coating the film material obtained in step (2) and drying it;

[0100] (4) embossing the film material obtained in step (3);

[0101] (5) The embossed film obtained in step (4) is subjected to β-ray irradiation with a radiation dose of 60 KGY.

[0102] Comparative Examples 1 to 5

[0103] The difference between Comparative Examples 1 to 2 and Example 3 is that the polyolefin substrate layer uses different brands of ethylene copolymer elastomer raw materials. The difference between Comparative Examples 3 to 5 and Example 7 is that the polyolefin substrate layer uses different brands of ethylene copolymer elastomer raw materials. The details are shown in Table 4:

[0104] Table 4: Brands of ethylene copolymer elastomers used in Comparative Examples 1 to 5

[0105] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 EV45LX UE508 DF110 DF940 VERSIFY2300

[0106] Comparative Examples 6-7

[0107] The difference between Comparative Examples 6 to 7 and Comparative Example 7 is that the polyolefin substrate layer uses different weight portions of ethylene copolymer elastomer and EPDM rubber, as shown in Table 5:

[0108] Table 5 Types and ratios of components of the polyolefin substrate layer used in Comparative Examples 6 to 7

[0109]

[0110] Comparative Example 8

[0111] The difference between Comparative Example 8 and Example 7 is that the polyolefin substrate layer uses ethylene propylene diene monomer rubber with the brand name Mitsui 3092PM.

[0112] Comparative Examples 9 to 10

[0113] The difference between Comparative Examples 9 to 10 and Preparation Example 7 is that irradiation doses of 5 KGY and 110 KGY are respectively used in the preparation process.

[0114] Comparative Examples 11-12

[0115] Comparative Examples 11-12 respectively selected automobile interiors made of common commercially available PVC and TPU materials as comparative samples for performance comparison.

[0116] The performance test results are shown in Table 6

[0117]

Claims

1. A soft environmentally friendly automobile interior leather, comprising a polyolefin substrate layer and a surface coating, It is characterized in that The polyolefin substrate layer comprises: Component (A): a mixture of 10 to 90 parts by weight of an ethylene copolymer elastomer and 10 to 90 parts by weight of ethylene propylene diene monomer rubber, wherein the sum of the parts by weight of the ethylene copolymer elastomer and the ethylene propylene diene monomer rubber is 100 parts; Component (B): 0 to 5 parts by weight of a cross-linking agent.

2. The soft environmentally friendly automotive interior leather according to claim 1, It is characterized in that The ethylene copolymer elastomer is copolymerized by ethylene and another monomer, and the other monomer is selected from one of alpha olefins with carbon chains of C4 to C8 or vinyl acetate.

3. The soft environmentally friendly automotive interior leather according to claim 2, It is characterized in that The other monomer is vinyl acetate, and the content of vinyl acetate in the ethylene copolymer elastomer is not less than 10 wt % and not more than 40 wt %.

4. The soft environmentally friendly automobile interior leather according to claim 1, It is characterized in that The ethylene copolymer elastomer has a melting point of less than 90° C. and a Shore A hardness of less than 80.

5. The soft environmentally friendly automobile interior leather according to claim 1, It is characterized in that The EPDM rubber is a copolymer of ethylene, propylene and a small amount of non-conjugated diene, and the content of the non-conjugated diene in the EPDM rubber is not less than 5%.

6. The soft environmentally friendly automobile interior leather according to claim 5, It is characterized in that The non-conjugated diene includes one of ethylidene norbornene, dicyclopentadiene and 1,4-hexadiene.

7. The soft environmentally friendly automobile interior leather according to claim 1, It is characterized in that The component (B) is selected from one or more of triallyl isocyanurate, triallyl cyanurate, glycidyl (meth)acrylate, methyl (meth)acrylate, trimethylolpropane trimethacrylate, propoxylated glycerol triacrylate, 2-carboxyethyl acrylate, isobornyl (meth)acrylate, 2-hydroxyethyl methacrylate phosphate and tripropylene glycol acrylate.

8. The soft environmentally friendly automobile interior leather according to claim 1, It is characterized in that The crosslinking degree is at least 40%, and the crosslinking method is electron beam irradiation crosslinking.

9. The soft environmentally friendly automobile interior leather according to claim 1, It is characterized in that Contains phosphonate or hindered phenol antioxidants.

10. The soft environmentally friendly automobile interior leather according to claim 1, It is characterized in that Contains inorganic metal oxides.

11. The soft environmentally friendly automobile interior leather according to claim 1, It is characterized in that Contains flame retardant.

12. A method for preparing the soft environmentally friendly automobile interior leather as claimed in claim 1, It is characterized in that The following steps are involved: (1) fully mixing the component (A), the component (B), the antioxidant, the metal oxide, the flame retardant and other additives to obtain a mixture; (2) adding the mixture into an extruder at an extrusion temperature of 50 to 130° C., extruding through a T-shaped flat die to form a film, and winding to obtain a film material; (3) irradiating the film obtained in step (2) with β rays or X-rays, with a radiation dose of 10 to 100 KGY; (4) coating the film material after irradiation in step (3) and drying it.

13. A method for preparing the soft environmentally friendly automobile interior leather as claimed in claim 1, It is characterized in that The following steps are involved: (1) fully mixing the component (A), the component (B), the antioxidant, the metal oxide, the flame retardant and other additives to obtain a mixture; (2) adding the mixture obtained in step (1) into an extruder at an extrusion temperature of 70 to 130° C., extruding and casting the mixture onto a fabric base fabric through a T-shaped flat die, and winding the mixture to obtain a film material; (3) irradiating the film obtained in step (2) with β rays or X-rays, with a radiation dose of 10 to 100 KGY; (4) coating the film material after irradiation in step (3) and drying it.

14. A method for preparing the soft environmentally friendly automobile interior leather as claimed in claim 1, It is characterized in that The following steps are involved: (1) fully mixing the component (A), the component (B), the antioxidant, the metal oxide, the flame retardant and other additives to obtain a mixture; (2) adding the mixture obtained in step (1) into an extruder at an extrusion temperature of 70 to 130° C., extruding and casting the mixture onto a fabric base fabric through a T-shaped flat die, and winding the mixture to obtain a film material; (3) coating the film material obtained in step (2) and drying it; (4) performing embossing treatment on the film material obtained in step (3); (5) The embossed film obtained in step (4) is irradiated with β rays, with a radiation dose of 10 to 100 KGY.

Images