A thermoplastic polyurethane elastomer-vinyl silicone rubber composite material, its preparation method and application

Abstract

The present invention provides a thermoplastic polyurethane elastomer-vinyl silicone rubber composite material, its preparation method and application, belonging to the technical field of functional materials. The thermoplastic polyurethane elastomer-vinyl silicone rubber composite material provided by the present invention has raw materials for preparation including thermoplastic polyurethane elastomer, vinyl silicone rubber, inorganic filler, structure control agent, compatibilizer and vulcanizing agent. The structure control agent is hydroxyl silicone oil and methyltriethoxysilane. The mass ratio of the thermoplastic polyurethane elastomer, vinyl silicone rubber, inorganic filler, structure control agent and compatibilizer 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 present invention has excellent mechanical properties.

Description

Technical Field

[0001] The present invention relates to the technical field of functional materials, and particularly relates to a thermoplastic polyurethane elastomer-vinyl silicone rubber composite material, a preparation method thereof, and an 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 and recovery properties, and good cold resistance and oil resistance. It is widely used in industries such as the automotive industry, the footwear industry, wires and cables, etc. However, 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 also has certain deficiencies.

[0003] Using thermoplastic polyurethane elastomer and silicone rubber to prepare a thermoplastic polyurethane elastomer-silicone rubber composite material can make the properties of the two complement each other. For example, the thermoplastic polyurethane elastomer-silicone rubber composite material has good high temperature and oil resistance, but its 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, a preparation method thereof, and an 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 invention purpose, the present invention provides the following technical solutions:

[0006] The present 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 vulcanizing agent. The structure control agent is hydroxy silicone oil and methyltriethoxysilane;

[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 hydroxyl silicone oil to methyltriethoxysilane is 1:0.6 - 1.

[0013] Preferably, the thermoplastic polyurethane elastomer includes a polyether-based thermoplastic polyurethane elastomer or a polyester-based 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 silica, talc powder, titanium dioxide, and calcium carbonate.

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

[0017] Preferably, the vulcanizing agent is 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, including the following steps:

[0019] Mix and knead the vinyl silicone rubber, inorganic filler, and structure control agent to obtain a kneaded material;

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

[0021] Preferably, the conditions for the kneading include: temperature is 60 - 160 °C, time is 0.5 - 3 h, and rotation speed is 15 - 60 rpm;

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

[0023] 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.

[0024] The present invention provides a thermoplastic polyurethane elastomer-vinyl silicone rubber composite material. The raw materials for preparation include thermoplastic polyurethane elastomer, vinyl silicone rubber, inorganic filler, structure control agent, compatibilizer and vulcanizing agent. The structure control agent is hydroxy silicone oil and methyltriethoxysilane; 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 vulcanizing agent is 0.2-1.8% of the mass of the thermoplastic polyurethane elastomer. The present invention uses a thermoplastic polyurethane elastomer and a vinyl silicone rubber as matrix materials, and uses a compound of hydroxy silicone oil and methyltriethoxysilane as a structure control agent, which can improve the mechanical properties and chemical resistance of the vinyl silicone rubber. At the same time, inorganic fillers, compatibilizers and vulcanizing agents 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 examples 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 set performance, heat resistance and friction resistance. Detailed Embodiments

[0025] The present invention provides a thermoplastic polyurethane elastomer-vinyl silicone rubber composite material. The raw materials for preparation include thermoplastic polyurethane elastomer, vinyl silicone rubber, inorganic filler, structure control agent, compatibilizer and vulcanizing agent. The structure control agent is hydroxy silicone oil and methyltriethoxysilane;

[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 for preparation are all 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 a thermoplastic polyurethane elastomer; the thermoplastic polyurethane elastomer preferably includes a polyether-based thermoplastic polyurethane elastomer or a polyester-based thermoplastic polyurethane elastomer.

[0033] The raw materials for preparing the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material of the present invention include a vinyl silicone rubber; the vinyl silicone rubber preferably includes a methyl vinyl silicone rubber or a methyl phenyl 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 an inorganic filler, and the inorganic filler is preferably one or more of silica, talc powder, titanium dioxide and calcium carbonate. Specifically, it can be silica, talc powder, titanium dioxide or calcium carbonate, or a mixture of silica and calcium carbonate; when the inorganic filler is a mixture of silica and calcium carbonate, the mass ratio of silica to calcium carbonate is preferably 1:1-2, more preferably 1:1-1.5. The silica in the present invention is preferably fumed silica. In the present invention, the particle size of the inorganic filler is preferably 0.05-10 μm. The present invention preferably uses the above-mentioned types and particle sizes of inorganic fillers, which can significantly improve the strength and wear resistance of the composite material and is beneficial 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 methyltriethoxysilane. The mass ratio of hydroxy silicone oil to methyltriethoxysilane is preferably 1:0.6-1, more preferably 1:0.7-0.8. The present invention uses the compound of hydroxy silicone oil and methyltriethoxysilane as the structure control agent, which has good compatibility with the inorganic filler and is beneficial 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 beneficial to improving the interfacial compatibility between the 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 the compatibilizer, which can reduce the interfacial tension, increase the thickness of the interfacial layer, prevent the aggregation of the dispersed phase, and stabilize the phase morphology structure, thereby enhancing the adhesion between different polymers and being beneficial to forming a stable blend structure.

[0037] The raw materials for preparing the thermoplastic polyurethane elastomer-vinyl silicone rubber composite of the present invention include a vulcanizing agent, and the vulcanizing agent is preferably a peroxide, more preferably 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane. The present invention preferably uses a peroxide as the vulcanizing agent, which can improve the tensile strength and hardness of the composite material, while maintaining good scorch safety, which is beneficial 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 in 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, it can be 100:70:30:4:10, can be 100:70:30:4:10, can be 100:70:30:4:10, can be 150:70:30:4:10, can be 400:70:30:4:10, or can be 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 can be 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 the examples of the present invention, the hardness of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite 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; the elongation at break is 539-762%, specifically 539%, 558%, 589%, 628% or 762%; the tear strength is 37-51 KN / m, specifically 37 KN / m, 38 KN / m, 40 KN / m, 45 KN / m or 51 KN / m; the compression set is 22-29%, specifically 22%, 24%, 25%, 26% or 29%; the heat distortion temperature is 110-128 °C, specifically 110 °C, 120 °C, 125 °C or 128 °C; the Taber abrasion resistance is 41-58 mg, specifically 41 mg, 47 mg, 52 mg, 55 mg or 58 mg.

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

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

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

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

[0044] After obtaining the mixed material, in the present invention, thermoplastic polyurethane elastomer, compatibilizer, vulcanizing agent and the above-mentioned mixed material are mixed, and a dynamic vulcanization reaction is carried out to obtain the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material. In the present invention, the conditions for 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 0.5-3 min, more preferably 1-2.5 min, and further preferably 1.5-2 min; the rotation speed is preferably 120-320 rpm, more preferably 160-260 rpm, and further preferably 180-200 rpm. In the examples 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 rotation speed in the twin-screw extruder.

[0045] After the dynamic vulcanization reaction, the present invention preferably further includes 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 the processes well-known to those skilled in the art can be adopted.

[0046] The present invention uses thermoplastic polyurethane elastomer and vinyl silicone rubber as matrix materials, uses a compound of hydroxyl silicone oil and methyltriethoxysilane as a structure control agent, and simultaneously adds inorganic fillers, compatibilizers and vulcanizing agents. During the dynamic vulcanization reaction process, the vinyl silicone rubber undergoes dynamic vulcanization in the molten thermoplastic polyurethane elastomer, wherein the vulcanizing agent (such as peroxide) crosslinks with the vinyl silicone rubber and is dispersed into micron-sized vulcanized rubber particles in the continuous phase of the thermoplastic polyurethane elastomer, thereby forming a rubber-plastic two-phase system with a sea-island structure. This two-phase coexisting system enables the obtained thermoplastic polyurethane elastomer-vinyl silicone rubber composite material to have both the characteristics of thermoplastic polyurethane elastomer and vinyl silicone rubber, having excellent mechanical properties, and at the same time also having good heat resistance, friction resistance and a smooth touch. In addition, the present invention adopts a thermoplastic processing method, which is simple in operation, low in production cost, and can be recycled and processed repeatedly.

[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 has no special limitation on the application method of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material, and a method well-known to those skilled in the art can be adopted.

[0048] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts belong to the scope of protection of the present invention.

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

[0050] The polyether-type thermoplastic polyurethane elastomer was purchased from BASF Company in Germany, and the model was 1180A;

[0051] The methyl vinyl silicone rubber was purchased from Xin'an Company, and the model was 110-3;

[0052] The hydroxyl silicone oil was purchased from Jiangsu Quanli Company, and the model was QL-203D;

[0053] The ethylene-methyl acrylate copolymer was purchased from Arkema Company, and the model was Ax8900;

[0054] The particle size of the inorganic filler was 0.05 - 10 μm.

[0055] Example 1

[0056] By weight parts, 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, and the thermoplastic polyurethane elastomer is a polyether-based thermoplastic polyurethane elastomer;

[0058] 70 parts of vinyl silicone rubber, 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 vulcanizing agent, and the vulcanizing agent is 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane;

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

[0061] 4 parts of structure control agent, and the structure control agent is hydroxy silicone oil and methyltriethoxysilane, and the mass ratio of hydroxy silicone oil to methyltriethoxysilane is 1:0.8;

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

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

[0064] Put the vinyl silicone rubber, inorganic filler and structure control agent into a kneader, and carry out kneading for 2 h at a temperature of 100 °C and a rotation speed of 50 rpm to obtain a kneaded material;

[0065] Put the kneaded material, thermoplastic polyurethane elastomer and vulcanizing agent into a twin-screw extruder, and carry out a dynamic vulcanization reaction for 1.5 min at a screw temperature of 190 °C and a screw rotation speed of 180 rpm; after the dynamic vulcanization reaction, extrude and pelletize to obtain the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material.

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

[0067] Refer to the method of Example 1 to prepare the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material, the difference lies in the formula, 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, where the parts involved are parts by mass, and the component ratio is the mass ratio; the types of raw materials for preparation and the preparation method not mentioned are all referred to Example 1.

[0069] Table 1 Formula of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material in the examples and comparative examples

[0070]

[0071] Test Example 1

[0072] The thermoplastic polyurethane elastomer-vinyl silicone rubber composites prepared in the examples and comparative examples were subjected to performance tests. The test results are shown in Table 2. The hardness test method was GB / T 6031-1998 (room temperature LS-A rubber Shore A hardness tester); the tensile strength test method was GB / T 1040; the elongation at break test method was GB / T 1040; the tear strength test method was GB / T 529-2008 (room temperature electronic tensile machine, tensile rate 500 mm / min); the compression set test method was GB / T 7759.1-2015; the heat distortion temperature test method was GB / T 1634-2004; the Taber abrasion resistance test method was GB / T 30314-2021.

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

[0074]

[0075] As can be seen from Table 2, the thermoplastic polyurethane elastomer-vinyl silicone rubber composites 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 increasing the addition amount of the vulcanizing agent is beneficial to improving the tensile strength and compression deformation properties of the thermoplastic polyurethane elastomer-vinyl silicone rubber composites. The results of Examples 1, 4 and 5 show that increasing the addition amount of the thermoplastic polyurethane elastomer is beneficial to improving the tensile strength and elongation at break of the thermoplastic polyurethane elastomer-vinyl silicone rubber composites.

[0076] In addition, it can also be seen from Table 2 that in Comparative Example 1, without adding a compatibilizer, the tensile strength, elongation and compression deformation properties of the thermoplastic polyurethane elastomer-vinyl silicone rubber composites will be reduced. Compared with Example 3, in Comparative Example 2, only methyltriethoxysilane was used as the structure control agent, and the tensile strength and elongation at break of the thermoplastic polyurethane elastomer-vinyl silicone rubber composites were reduced. In Comparative Example 3, only hydroxy silicone oil was used as the structure control agent, and the tensile strength and elongation at break of the thermoplastic polyurethane elastomer-vinyl silicone rubber composites were reduced. From Comparative Example 1 and Comparative Example 4, it can be seen that if the vulcanizing agent is not added, the physical and mechanical properties of the thermoplastic polyurethane elastomer-vinyl silicone rubber composites 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 composites.

[0077] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A thermoplastic polyurethane elastomer-vinyl silicone rubber composite, characterized in that, The raw materials for preparation are thermoplastic polyurethane elastomer, vinyl silicone rubber, inorganic filler, structure control agent, compatibilizer and vulcanizing agent. The structure control agent is hydroxyl silicone oil and methyltriethoxysilane; the mass ratio of the hydroxyl silicone oil to the methyltriethoxysilane is 1:0.6 - 1; the vulcanizing agent is peroxide; the particle size of the inorganic filler is 0.05 - 10 μm; 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; The preparation method of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material is carried out according to the following steps: Mix the vinyl silicone rubber, inorganic filler and structure control agent to obtain a mixed material; Mix the thermoplastic polyurethane elastomer, compatibilizer, vulcanizing agent and the mixed material, and carry out a dynamic vulcanization reaction to obtain the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material.

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

3. The thermoplastic polyurethane elastomer-vinyl silicone rubber composite according to claim 1, wherein 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%.

4. The thermoplastic polyurethane elastomer-vinyl silicone rubber composite according to claim 1, wherein The inorganic filler is one or more of white carbon black, talc powder, titanium dioxide and calcium carbonate.

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

6. The preparation method of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material according to any one of claims 1 to 5, characterized in that, Carry out according to the following steps: Mix the vinyl silicone rubber, inorganic filler and structure control agent to obtain a mixed material; Mix the thermoplastic polyurethane elastomer, compatibilizer, vulcanizing agent and the mixed material, and carry out a dynamic vulcanization reaction to obtain the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material.

7. The preparation method according to claim 6, characterized in that, The conditions for the mixing include: the temperature is 60 - 160 °C, the time is 0.5 - 3 h, and the rotation speed is 15 - 60 rpm; The conditions for the dynamic vulcanization reaction include: the temperature is 180 - 200 °C, the time is 0.5 - 3 min, and the rotation speed is 120 - 320 rpm.

8. Application of the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material according to any one of claims 1 - 5 or the thermoplastic polyurethane elastomer-vinyl silicone rubber composite material prepared by the preparation method according to claim 6 or 7 in the preparation of 3C digital products or smart wearable products.

Images