Thermoplastic polyurethane elastomer-vinyl silicone rubber composite material as well as preparation method and application thereof

Abstract

The invention provides a thermoplastic polyurethane elastomer-vinyl silicone rubber composite material as well as a preparation method and application thereof, and belongs to the technical field of functional materials. The thermoplastic polyurethane elastomer-vinyl silicone rubber composite material provided by the invention is prepared from the following raw materials: a thermoplastic polyurethane elastomer, vinyl silicone rubber, an inorganic filler, a structure control agent, a compatilizer and a vulcanizing agent, and the structure control agent is hydroxyl silicone oil and methyltriethoxysilane; the mass ratio of the thermoplastic polyurethane elastomer to the vinyl silicone rubber to the inorganic filler to the structure control agent to the compatilizer is (100-400): (20-80): (5-50): (1-8): (1-10), and the mass of the vulcanizing agent is 0.2-1.8% of the mass of the thermoplastic polyurethane elastomer. The thermoplastic polyurethane elastomer-vinyl silicone rubber composite material provided by the invention has excellent mechanical properties.

Description

Technical Field

[0001] The invention relates to the technical field of functional materials, and in particular to a thermoplastic polyurethane elastomer-vinyl silicone rubber composite material and a preparation method and application thereof. Background Art

[0002] Thermoplastic polyurethane elastomer (TPU) is an organic polymer synthetic material formed by the polymerization of isocyanate and polyol compounds. It has excellent elongation recovery, cold resistance and oil resistance. It is widely used in the automotive industry, shoemaking industry, wire and cable industry, etc., but its aging resistance and heat resistance are poor. Silicone rubber has excellent high and low temperature resistance and aging resistance, but its mechanical strength is poor and its oil resistance is also insufficient.

[0003] Thermoplastic polyurethane elastomer and silicone rubber are used to prepare a thermoplastic polyurethane elastomer-silicone rubber composite material, so that the properties of the two are complementary. For example, the thermoplastic polyurethane elastomer-silicone rubber composite material has good high temperature resistance and oil resistance, but the mechanical properties still need to be improved. Summary of the invention

[0004] The purpose of the present invention is to provide a thermoplastic polyurethane elastomer-vinyl silicone rubber composite material and a preparation method and application thereof. The thermoplastic polyurethane elastomer-vinyl silicone rubber composite material provided by the present invention has excellent mechanical properties.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a thermoplastic polyurethane elastomer-vinyl silicone rubber composite material, wherein the raw materials for preparing the composite material include thermoplastic polyurethane elastomer, vinyl silicone rubber, inorganic filler, structure control agent, compatibilizer and vulcanizer, wherein the structure control agent is hydroxy silicone oil and methyl triethoxy silane;

[0007] The mass ratio of the thermoplastic polyurethane elastomer to the vinyl silicone rubber is 100-400:20-80;

[0008] The mass ratio of the thermoplastic polyurethane elastomer to the inorganic filler is 100-400:5-50;

[0009] The mass ratio of the thermoplastic polyurethane elastomer to the structure control agent is 100-400:1-8;

[0010] The mass ratio of the thermoplastic polyurethane elastomer to the compatibilizer is 100-400:1-10;

[0011] The mass of the vulcanizing agent is 0.2-1.8% of the mass of the thermoplastic polyurethane elastomer.

[0012] Preferably, the mass ratio of the hydroxy silicone oil to methyltriethoxysilane is 1:0.6-1.

[0013] Preferably, the thermoplastic polyurethane elastomer includes polyether thermoplastic polyurethane elastomer or polyester thermoplastic polyurethane elastomer.

[0014] Preferably, the vinyl silicone rubber includes methyl vinyl silicone rubber or methyl phenyl vinyl silicone rubber, and the molar content of vinyl in the vinyl silicone rubber is 0.04-1%.

[0015] Preferably, the inorganic filler is one or more of white carbon black, talc, titanium dioxide and calcium carbonate.

[0016] Preferably, the compatibilizer is ethylene-methyl acrylate copolymer.

[0017] Preferably, the vulcanizing agent is a peroxide.

[0018] The present invention provides a method for preparing the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material described in the above technical solution, comprising the following steps:

[0019] The vinyl silicone rubber, the inorganic filler and the structure control agent are mixed to obtain a mixed material;

[0020] The thermoplastic polyurethane elastomer, a compatibilizer, a vulcanizing agent and the mixed material are mixed to carry out a dynamic vulcanization reaction to obtain the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material.

[0021] Preferably, the mixing conditions include: temperature of 60 to 160°C, time of 0.5 to 3 hours, and rotation speed of 15 to 60 rpm;

[0022] The conditions of the dynamic vulcanization reaction include: temperature of 180-200° C., time of 0.5-3 min, and rotation speed of 120-320 rpm.

[0023] The present invention provides the use of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material described in the above technical scheme or the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material prepared by the preparation method described in the above technical scheme in the preparation of 3C digital products or smart wearable products.

[0024] The invention provides a thermoplastic polyurethane elastomer-vinyl silicone rubber composite material. The preparation raw materials include thermoplastic polyurethane elastomer, vinyl silicone rubber, inorganic filler, structure control agent, compatibilizer and vulcanizer. The structure control agent is hydroxy silicone oil and methyl triethoxy silane. The mass ratio of the thermoplastic polyurethane elastomer to the vinyl silicone rubber is 100-400:20-80, the mass ratio of the thermoplastic polyurethane elastomer to the inorganic filler is 100-400:5-50, the mass ratio of the thermoplastic polyurethane elastomer to the structure control agent is 100-400:1-8, the mass ratio of the thermoplastic polyurethane elastomer to the compatibilizer is 100-400:1-10, and the mass of the vulcanizer is 0.2-1.8% of the mass of the thermoplastic polyurethane elastomer. The present invention adopts thermoplastic polyurethane elastomer and vinyl silicone rubber as matrix materials, and adopts hydroxy silicone oil and methyltriethoxysilane compound as structure control agent, which can improve the mechanical properties and chemical resistance of vinyl silicone rubber, and at the same time, inorganic fillers, compatibilizers and vulcanizers are added, so that the prepared thermoplastic polyurethane elastomer-vinyl silicone rubber composite material has excellent mechanical properties. In addition, the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material provided by the present invention also has good heat resistance and friction resistance, and can be widely used in the preparation of 3C digital products or smart wearable products. The results of the embodiment show that the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material provided by the present invention has excellent tensile strength, elongation at break, tear strength, compression deformation performance, heat resistance and friction resistance. DETAILED DESCRIPTION

[0025] The present invention provides a thermoplastic polyurethane elastomer-vinyl silicone rubber composite material, wherein the raw materials for preparing the composite material include thermoplastic polyurethane elastomer, vinyl silicone rubber, inorganic filler, structure control agent, compatibilizer and vulcanizer, wherein the structure control agent is hydroxy silicone oil and methyl triethoxy silane;

[0026] The mass ratio of the thermoplastic polyurethane elastomer to the vinyl silicone rubber is 100-400:20-80;

[0027] The mass ratio of the thermoplastic polyurethane elastomer to the inorganic filler is 100-400:5-50;

[0028] The mass ratio of the thermoplastic polyurethane elastomer to the structure control agent is 100-400:1-8;

[0029] The mass ratio of the thermoplastic polyurethane elastomer to the compatibilizer is 100-400:1-10;

[0030] The mass of the vulcanizing agent is 0.2-1.8% of the mass of the thermoplastic polyurethane elastomer.

[0031] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the art.

[0032] The raw materials for preparing the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material of the present invention include thermoplastic polyurethane elastomer; the thermoplastic polyurethane elastomer preferably includes polyether thermoplastic polyurethane elastomer or polyester thermoplastic polyurethane elastomer.

[0033] The raw materials for preparing the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material of the present invention include vinyl silicone rubber; the vinyl silicone rubber preferably includes methyl vinyl silicone rubber or methylphenyl vinyl silicone rubber, and the molar content of vinyl in the vinyl silicone rubber is preferably 0.04-1%, more preferably 0.1-0.5%, and further preferably 0.2-0.3%.

[0034] The raw materials for preparing the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material of the present invention include inorganic fillers, and the inorganic filler is preferably one or more of white carbon black, talcum powder, titanium dioxide and calcium carbonate, and can be specifically white carbon black, talcum powder, titanium dioxide or calcium carbonate, or a mixture of white carbon black and calcium carbonate; when the inorganic filler is a mixture of white carbon black and calcium carbonate, the mass ratio of white carbon black to calcium carbonate is preferably 1:1-2, and more preferably 1:1-1.5. The white carbon black of the present invention is preferably fumed white carbon black. In the present invention, the particle size of the inorganic filler is preferably 0.05-10 μm. The present invention preferably uses inorganic fillers of the above types and particle sizes, which can significantly improve the strength and wear resistance of the composite material, and is conducive to improving the service life of the composite material.

[0035] The raw materials for preparing the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material of the present invention include a structure control agent, and the structure control agent is hydroxy silicone oil and methyl triethoxy silane, and the mass ratio of the hydroxy silicone oil to methyl triethoxy silane is preferably 1:0.6-1, and more preferably 1:0.7-0.8. The present invention adopts hydroxy silicone oil and methyl triethoxy silane as a structure control agent, which has good compatibility with inorganic fillers and is conducive to improving the comprehensive performance of the composite material; the present invention preferably controls the mass ratio of the two within the above range, which is conducive to improving the interface compatibility of vinyl silicone rubber and other materials.

[0036] The raw materials for preparing the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material of the present invention include a compatibilizer, and the compatibilizer is preferably an ethylene-methyl acrylate copolymer. The present invention preferably uses an ethylene-methyl acrylate copolymer as a compatibilizer, which can reduce interfacial tension, increase the thickness of the interface layer, prevent the dispersed phase from agglomerating, stabilize the phase morphology, thereby enhancing the adhesion between different polymers, and is conducive to forming a stable blending structure.

[0037] The raw materials for preparing the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material of the present invention include a vulcanizing agent, and the vulcanizing agent is preferably a peroxide, and more preferably 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane. The present invention preferably uses peroxide as a vulcanizing agent, which can improve the tensile strength and hardness of the composite material, while maintaining good scorch safety, which is conducive to ensuring the quality of the composite material and reducing costs.

[0038] The mass ratio of the thermoplastic polyurethane elastomer, vinyl silicone rubber, inorganic filler, structure control agent and compatibilizer of the present invention is 100-400:20-80:5-50:1-8:1-10, preferably 100-400:50-80:20-50:2-6:5-10, more preferably 100-400:60-70:30-40:3-5:8-10, specifically 100:70:30:4:10, 100:70:30:4:10, 100:70:30:4:10, 100:70:30:4:10, 150:70:30:4:10, 400:70:30:4:10, or 100:70:30:4:10. In the present invention, the mass of the vulcanizing agent is preferably 0.2-1.8% of the mass of the thermoplastic polyurethane elastomer, specifically 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.2%, 1.5% or 1.8%.

[0039] In an embodiment of the present invention, the hardness of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material is 71-77, specifically 71, 72, 73, 75 or 77; the tensile strength is 13.2-23.8 MPa, specifically 13.2 MPa, 14.8 MPa, 16.2 MPa, 18.6 MPa or 23.8 MPa; the elongation at break is 539-762%, specifically 539%, 558%, 589%, 628% or 762%; the tear strength is 37-51KN / m, specifically 37KN / m, 38KN / m, 40KN / m, 45KN / m or 51KN / m; compression set is 22-29%, specifically 22%, 24%, 25%, 26% or 29%; heat deformation temperature is 110-128°C, specifically 110°C, 120°C, 125°C or 128°C; Taber wear resistance is 41-58mg, specifically 41mg, 47mg, 52mg, 55mg or 58mg.

[0040] The present invention provides a method for preparing the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material described in the above technical solution, comprising the following steps:

[0041] The vinyl silicone rubber, the inorganic filler and the structure control agent are mixed to obtain a mixed material;

[0042] The thermoplastic polyurethane elastomer, a compatibilizer, a vulcanizing agent and the mixed material are mixed to carry out a dynamic vulcanization reaction to obtain the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material.

[0043] The present invention mixes vinyl silicone rubber, inorganic filler and structure control agent to obtain a mixed material. In the present invention, the mixing conditions include: the temperature is preferably 60-160°C, more preferably 80-120°C, and more preferably 90-100°C; the time is preferably 0.5-3h, more preferably 1-2.5h, and more preferably 1.5-2h; the rotation speed is preferably 15-60rpm, more preferably 40-55rpm, and more preferably 45-50rpm. In an embodiment of the present invention, the mixing can be specifically carried out in an internal mixer or a kneader.

[0044] After obtaining the mixed material, the present invention mixes the thermoplastic polyurethane elastomer, the compatibilizer, the vulcanizer and the mixed material, and performs a dynamic vulcanization reaction to obtain the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material. In the present invention, the conditions of the dynamic vulcanization reaction include: the temperature is preferably 180-200°C, more preferably 183-195°C, and further preferably 186-190°C; the time is preferably 0.5-3min, more preferably 1-2.5min, and further preferably 1.5-2min; the rotation speed is preferably 120-320rpm, more preferably 160-260rpm, and further preferably 180-200rpm. In an embodiment of the present invention, the dynamic vulcanization reaction can be specifically carried out in a twin-screw extruder, and the rotation speed of the dynamic vulcanization reaction specifically refers to the screw speed in the twin-screw extruder.

[0045] After the dynamic vulcanization reaction, the present invention preferably further comprises extrusion and granulation in sequence to obtain the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material. The present invention has no special limitation on the extrusion and granulation, and processes well known to those skilled in the art can be used.

[0046] The present invention adopts thermoplastic polyurethane elastomer and vinyl silicone rubber as matrix materials, adopts hydroxy silicone oil and methyl triethoxy silane compound as structure control agent, adds inorganic filler, compatibilizer and vulcanizing agent simultaneously, vinyl silicone rubber is dynamically vulcanized in molten thermoplastic polyurethane elastomer in dynamic vulcanization reaction process, wherein vulcanizing agent (such as peroxide) and vinyl silicone rubber produce crosslinking, and disperse into micron-level vulcanized rubber particles in thermoplastic polyurethane elastomer continuous phase, thereby forming rubber-plastic two-phase system of sea-island structure, the system of the two-phase coexistence, makes the obtained thermoplastic polyurethane elastomer-vinyl silicone rubber composite material have the characteristics of thermoplastic polyurethane elastomer and vinyl silicone rubber, has excellent mechanical properties, and also has good heat resistance and friction resistance and silky touch. In addition, the present invention adopts thermoplastic plastic processing mode, is simple to operate, has low production cost, and can be repeatedly processed and utilized.

[0047] The present invention provides the application of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material described in the above technical solution or the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material prepared by the preparation method described in the above technical solution in the preparation of 3C digital products or smart wearable products. The present invention does not specifically limit the application of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material, and a method familiar to those skilled in the art can be used.

[0048] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] The sources and indicators of some raw materials in the following examples and comparative examples are as follows:

[0050] The polyether thermoplastic polyurethane elastomer was purchased from BASF, Germany, model 1180A;

[0051] Methyl vinyl silicone rubber was purchased from Xin'an Company, model 110-3;

[0052] Hydroxyl silicone oil was purchased from Jiangsu Quanli Company, model number QL-203D;

[0053] Ethylene-methyl acrylate copolymer was purchased from Arkema, model Ax8900;

[0054] The particle size of the inorganic filler is 0.05 to 10 μm.

[0055] Example 1

[0056] In parts by weight, the raw materials for preparing the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material in this embodiment are as follows:

[0057] 100 parts of thermoplastic polyurethane elastomer, wherein the thermoplastic polyurethane elastomer is a polyether type thermoplastic polyurethane elastomer;

[0058] 70 parts of vinyl silicone rubber, wherein the vinyl silicone rubber is methyl vinyl silicone rubber, and the molar content of vinyl in the methyl vinyl silicone rubber is 0.2%;

[0059] 1.2 parts of a vulcanizing agent, wherein the vulcanizing agent is 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane;

[0060] 30 parts of an inorganic filler, wherein the inorganic filler is fumed silica;

[0061] 4 parts of a structure control agent, wherein the structure control agent is hydroxy silicone oil and methyl triethoxy silane, and the mass ratio of the hydroxy silicone oil to methyl triethoxy silane is 1:0.8;

[0062] 10 parts of a compatibilizer, wherein the compatibilizer is ethylene-methyl acrylate copolymer.

[0063] The preparation method of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material described in this embodiment is as follows:

[0064] The vinyl silicone rubber, the inorganic filler and the structure control agent are placed in an internal mixer, and mixed for 2 hours at a temperature of 100° C. and a rotation speed of 50 rpm to obtain a mixed material;

[0065] The mixed material, thermoplastic polyurethane elastomer and vulcanizing agent are placed in a twin-screw extruder, and a dynamic vulcanization reaction is carried out for 1.5 minutes at a screw temperature of 190° C. and a screw speed of 180 rpm; after the dynamic vulcanization reaction, the mixture is extruded and granulated to obtain the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material.

[0066] Examples 2 to 6 and Comparative Examples 1 to 5

[0067] A thermoplastic polyurethane elastomer-vinyl silicone rubber composite material was prepared by referring to the method of Example 1, except that the formula is as shown in Table 1.

[0068] Table 1 shows the formula of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material in the examples and comparative examples, wherein the numbers involved are numbers by mass and the component ratios are mass ratios; the types of raw materials and preparation methods not mentioned are all referred to in Example 1.

[0069] Table 1 Formulas of thermoplastic polyurethane elastomer-vinyl silicone rubber composite materials in Examples and Comparative Examples

[0070]

[0071] Test Example 1

[0072] The thermoplastic polyurethane elastomer-vinyl silicone rubber composite materials prepared in the examples and comparative examples were subjected to performance tests, and the test results are shown in Table 2, wherein the hardness test method is GB / T6031-1998 (LS-A rubber Shore A hardness meter at room temperature); the tensile strength test method is GB / T 1040; the elongation at break test method is GB / T 1040; the tear strength test method is GB / T 529-2008 (the tensile rate of the room temperature electronic tensile machine is 500 mm / min); the compression permanent deformation test method is GB / T 7759.1-2015; the heat deformation temperature test method is GB / T 1634-2004; and the Taber abrasion resistance test method is GB / T 30314-2021.

[0073] Table 2 Performance test results of thermoplastic polyurethane elastomer-vinyl silicone rubber composite materials in the examples and comparative examples

[0074]

[0075] As shown in Table 2, the thermoplastic polyurethane elastomer-vinyl silicone rubber composite materials prepared in Examples 1 to 6 have excellent physical and mechanical properties, water resistance and heat resistance. The results of Examples 1 to 3 show that the increase in the amount of vulcanizing agent added is conducive to improving the tensile strength and compression deformation properties of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material. The results of Examples 1, 4 and 5 show that the increase in the amount of thermoplastic polyurethane elastomer added is conducive to improving the tensile strength and elongation at break of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material.

[0076] In addition, it can be seen from Table 2 that if no compatibilizer is added in Comparative Example 1, the tensile strength, elongation and compression deformation performance of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material will be reduced. Compared with Example 3, in Comparative Example 2, only methyltriethoxysilane is used as a structure control agent, and the tensile strength and elongation at break of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material are reduced. In Comparative Example 3, only hydroxy silicone oil is used as a structure control agent, and the tensile strength and elongation at break of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material are reduced. It can be seen from Comparative Examples 1 and 4 that if no vulcanizing agent is added, the physical and mechanical properties of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material will be further reduced. However, adding too much vulcanizing agent in Comparative Example 5 will also have an adverse effect on the physical and mechanical properties of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material.

[0077] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A thermoplastic polyurethane elastomer-vinyl silicone rubber composite material, characterized in that: The preparation raw materials include thermoplastic polyurethane elastomer, vinyl silicone rubber, inorganic filler, structure control agent, compatibilizer and vulcanizer, wherein the structure control agent is hydroxy silicone oil and methyl triethoxy silane; The mass ratio of the thermoplastic polyurethane elastomer to the vinyl silicone rubber is 100-400:20-80; The mass ratio of the thermoplastic polyurethane elastomer to the inorganic filler is 100-400:5-50; The mass ratio of the thermoplastic polyurethane elastomer to the structure control agent is 100-400:1-8; The mass ratio of the thermoplastic polyurethane elastomer to the compatibilizer is 100-400:1-10; The mass of the vulcanizing agent is 0.2-1.8% of the mass of the thermoplastic polyurethane elastomer.

2. The thermoplastic polyurethane elastomer-vinyl silicone rubber composite material according to claim 1, characterized in that: The mass ratio of the hydroxy silicone oil to methyltriethoxysilane is 1:0.6-1.

3. The thermoplastic polyurethane elastomer-vinyl silicone rubber composite material according to claim 1 or 2, characterized in that: The thermoplastic polyurethane elastomer includes polyether thermoplastic polyurethane elastomer or polyester thermoplastic polyurethane elastomer.

4. The thermoplastic polyurethane elastomer-vinyl silicone rubber composite material according to claim 1 or 2, characterized in that: The vinyl silicone rubber includes methyl vinyl silicone rubber or methyl phenyl vinyl silicone rubber, and the molar content of vinyl in the vinyl silicone rubber is 0.04-1%.

5. The thermoplastic polyurethane elastomer-vinyl silicone rubber composite material according to claim 1 or 2, characterized in that: The inorganic filler is one or more of white carbon black, talcum powder, titanium dioxide and calcium carbonate.

6. The thermoplastic polyurethane elastomer-vinyl silicone rubber composite material according to claim 1 or 2, characterized in that: The compatibilizer is ethylene-methyl acrylate copolymer.

7. The thermoplastic polyurethane elastomer-vinyl silicone rubber composite material according to claim 1 or 2, characterized in that: The vulcanizing agent is a peroxide.

8. The method for preparing the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material according to any one of claims 1 to 7, characterized in that: The following steps are involved: The vinyl silicone rubber, the inorganic filler and the structure control agent are mixed to obtain a mixed material; The thermoplastic polyurethane elastomer, a compatibilizer, a vulcanizing agent and the mixed material are mixed to carry out a dynamic vulcanization reaction to obtain the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material.

9. The preparation method according to claim 8, characterized in that: The mixing conditions include: temperature of 60-160°C, time of 0.5-3h, and rotation speed of 15-60rpm; The conditions of the dynamic vulcanization reaction include: temperature of 180-200° C., time of 0.5-3 min, and rotation speed of 120-320 rpm.

10. Use of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material according to any one of claims 1 to 7 or the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material prepared by the preparation method according to claim 8 or 9 in the preparation of 3C digital products or smart wearable products.

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