Thermoplastic silica gel elastomer and preparation method thereof

Abstract

The invention provides a thermoplastic silica gel elastomer and a preparation method thereof, and relates to the technical field of silica gel elastomers. The thermoplastic silica gel elastomer is prepared from the following raw materials in parts by weight: 100 parts of thermoplastic polyurethane elastomer, 40 to 60 parts of vinyl silicone rubber, 20 to 25 parts of PFAS-GO coated SiO2, 6 to 8 parts of boron nitride, 1.4 to 1.8 parts of vulcanizing agent, 2 to 3 parts of hydroxyl silicone oil and 6 to 8 parts of ethylene-methyl acrylate copolymer. According to the thermoplastic silica gel elastomer disclosed by the invention, the thermal stability is improved, and the improvement effect of the filler on the comprehensive performance of the thermoplastic silica gel elastomer is improved aiming at the problems that the reinforcing effect of part of the filler is limited and the comprehensive performance of the thermoplastic silica gel elastomer cannot be remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of silica gel elastomer, in particular to a thermoplastic silica gel elastomer and a preparation method thereof. BACKGROUND

[0002] As an important class of high polymer materials, thermoplastic elastomers have both high elasticity of rubber and thermal processability of plastic, and are widely used in many fields. As a special category of thermoplastic elastomers, thermoplastic silica gel elastomers exhibit excellent high and low temperature resistance, weather resistance, physiological inertness and good electrical insulation due to their unique molecular structure, and have great application potential in medical, electronic, automotive and other industries.

[0003] Although the thermoplastic silica gel elastomer itself has certain high and low temperature resistance, its performance will still be affected in some extreme high temperature environments. Long-term exposure to high temperature environment may cause degradation and aging of the material, resulting in a decrease in physical properties such as increased hardness and loss of elasticity. This is a serious problem for some applications in high temperature working conditions, such as automotive engine peripheral components and high temperature industrial equipment seals. The lack of thermal stability limits the wide application of thermoplastic silica gel elastomers in high temperature fields. In addition, fillers play an important role in reinforcing and modifying thermoplastic silica gel elastomers. However, the reinforcing effect of some fillers is limited and cannot significantly improve the overall performance of thermoplastic silica gel elastomers. For example, some traditional inorganic fillers can increase the hardness of the material, but may reduce its flexibility and elasticity. In view of the above problems, the present application provides a thermoplastic silica gel elastomer and a preparation method thereof. SUMMARY

[0004] The purpose of the present application is to provide a thermoplastic silica gel elastomer and a preparation method thereof, which improves the thermal stability and the improvement effect of fillers on the overall performance of thermoplastic silica gel elastomers.

[0005] In one aspect, the present application provides a thermoplastic silica gel elastomer, comprising the following raw materials by weight: 100 parts of thermoplastic polyurethane elastomer, 40-60 parts of vinyl silicone rubber, 20-25 parts of PFAS-GO@SiO2, 6-8 parts of boron nitride, 1.4-1.8 parts of vulcanizing agent, 2-3 parts of hydroxyl silicone oil, and 6-8 parts of ethylene-methyl acrylate copolymer.

[0006] Further, the preparation method of the PFAS-GO@SiO2 comprises: dispersing SiO2 in a graphene oxide aqueous dispersion, immersing in a vacuum dryer, stirring at 40-45℃ and 100-150rpm for 10-12h, and then obtaining a GO@SiO2 precursor after filtration, washing and drying; dispersing the GO@SiO2 precursor in ethanol, adding heptadecafluorodecyltrimethoxysilane for reflux reaction, and then obtaining the product after washing and drying.

[0007] The SiO2 in the modified filler PFAS-GO@SiO2 in the present application has a large specific surface area, which can provide more attachment sites for other components and enhance the interaction between the filler and the polymer matrix. Graphene oxide (GO) has good mechanical properties and electrical conductivity, and its combination with SiO2 to form a GO@SiO2 precursor can further improve the overall performance of the filler. The introduction of heptadecafluorodecyltrimethoxysilane plays a key modification role, which can modify the surface of GO@SiO2 to make the filler surface hydrophobic. This hydrophobicity makes PFAS-GO@SiO2 have better compatibility with the hydrophobic polymer matrix in the thermoplastic silicone elastomer, thereby enhancing the interfacial bonding between the filler and the polymer.

[0008] After heptadecafluorodecyltrimethoxysilane is combined with GO@SiO2, the filler is given hydrophobicity, and the polymer matrix in the elastomer also has certain hydrophobicity. This hydrophobic-hydrophobic interaction allows the filler and the matrix to form a tighter bond. The fluorine atoms in the heptadecafluorodecyltrimethoxysilane molecule have high electronegativity, making the surface of the molecule hydrophobic. When it modifies GO@SiO2, the hydrophobicity of the filler surface is enhanced, and the compatibility between the hydrophobic polymer matrix in the thermoplastic silicone elastomer is significantly improved. At the interface, hydrophobic interaction can form a more stable bond, reducing the voids and defects between the filler and the matrix. When subjected to external forces, this tight interfacial bonding can more effectively transfer stress, improving the mechanical properties of the elastomer, such as tensile strength and tear strength. At the same time, the hydrophobic surface of the filler can reduce the adsorption of water and other polar substances, helping to maintain the structural stability of the elastomer in high-temperature environments and improving thermal stability. The hydrophilic groups provided by 3-aminopropyltriethoxysilane have poor compatibility with the hydrophobic components in the system, resulting in weak interfacial bonding and the inability to effectively enhance the performance of the filler, thereby affecting the overall performance of the elastomer. Therefore, the selection of silane type has a significant impact on the modification of the filler and the performance of the final thermoplastic silicone elastomer.

[0009] Further, the specific surface area of the SiO2 is 350-400 m 2 / g.

[0010] Further, the concentration of the graphene oxide aqueous dispersion is 0.5-1 mg / mL.

[0011] Further, the weight ratio of the SiO2, graphene, and heptadecafluorodecyltrimethoxysilane is 100: 50-150: 2-5.

[0012] Further, the solid content of the GO@SiO2 precursor dispersed in ethanol is 35-45 g / L.

[0013] Further, the vacuum drying device comprises the following steps: vacuumizing to a pressure of at least -0.1 MPa, maintaining for 30-40 min, then releasing, repeating 2-4 times.

[0014] The vacuum impregnation step and the subsequent PFAS modification step cooperate to optimize the structure of the filler. Sufficient impregnation allows GO to be uniformly distributed on the surface and in the pores of SiO2, providing a good foundation for subsequent PFAS modification. PFAS modification occurs on the surface of SiO2 with uniformly loaded GO, which can more effectively improve the surface properties of the filler. This vacuum environment creates a negative pressure condition, making it easier for GO aqueous dispersion to enter the pores of SiO2. During the impregnation process, GO molecules gradually fill the small pores of SiO2 and form a tight bond with SiO2. This tight bond not only increases the specific surface area of the filler, but also improves the structural integrity of the filler. When the filler is dispersed in a thermoplastic silicone elastomer, SiO2 with uniformly loaded GO can better interact with the polymer matrix, enhancing the interfacial bonding. When subjected to external force or thermal stress, the structurally complete filler can more effectively transfer stress and heat, reducing performance degradation caused by filler structure damage. At the same time, the vacuum impregnation step ensures uniform distribution of the components in the filler, avoiding performance weaknesses caused by local component unevenness, thereby improving the overall performance of the elastomer, including mechanical properties, thermal stability and wear resistance.

[0015] Further, the vulcanizing agent is 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane.

[0016] In another aspect, the present application also provides a method for preparing a thermoplastic silicone elastomer, comprising the following steps: mixing vinyl silicone rubber, hydroxyl silicone oil, PFAS-GO@SiO2 and boron nitride at a starting temperature of 60-70℃, running at a low speed of 30-40 rpm for 5-8 min, increasing the temperature to 75-85℃, increasing the speed to 50-70 rpm, and continuing to mix for 25-35 min to obtain a masterbatch; mixing the thermoplastic polyurethane elastomer, the thermoplastic polyurethane elastomer, the curing machine and the masterbatch, and performing dynamic vulcanization to obtain the thermoplastic silicone elastomer.

[0017] Further, the dynamic vulcanization temperature is 185-195℃, the time is 1-3 min, and the speed is 250-300 rpm.

[0018] The beneficial effects of the present application are:

[0019] The good interface bonding is crucial for stress transfer in the thermoplastic silicone elastomer system. When subjected to external forces, PFAS-GO@SiO2 can more effectively transfer stress from the polymer matrix to the filler, utilize the high strength of the filler itself to bear the stress, reduce the stress concentration of the polymer matrix, and thus improve the mechanical properties of the elastomer, such as tensile strength and tear strength. At the same time, the close combination of hydrophobic PFAS-GO@SiO2 and the polymer matrix helps to maintain the structural stability of the elastomer, and in a high-temperature environment, it can reduce the separation of fillers and matrix caused by thermal motion, thereby improving thermal stability. In addition, uniformly dispersed PFAS-GO@SiO2 can also form a protective film on the surface of the elastomer, reducing material loss during abrasion and improving wear resistance.

[0020] In the thermoplastic silicone elastomer of the present application, boron nitride and PFAS-GO@SiO2 synergistically improve the comprehensive performance of the elastomer. In the elastomer system, it cooperates with PFAS-GO@SiO2 to exert its own advantages. PFAS-GO@SiO2 mainly focuses on improving mechanical properties and thermal stability, while boron nitride further optimizes the elastomer from the aspects of thermal conductivity and lubrication.

[0021] Among them, the high thermal conductivity of boron nitride can quickly conduct the heat generated inside the elastomer out, avoiding the performance decline caused by local overheating. When the elastomer is subjected to thermal stress, the structural stability provided by PFAS-GO@SiO2 can prevent internal stress concentration caused by uneven thermal expansion, while the thermal conductivity of boron nitride helps to evenly disperse heat and reduce the damage of thermal stress to the elastomer, thereby further improving thermal stability. In terms of wear resistance, the lubricity of boron nitride can reduce the friction between the elastomer and the contact surface, reducing the wear rate. At the same time, the filler network structure formed by boron nitride and PFAS-GO@SiO2 can play a supporting role in the wear process, preventing excessive material shedding, and improving the wear resistance of the elastomer. In addition, in terms of elastic recovery, the synergistic effect of boron nitride and PFAS-GO@SiO2 also helps to maintain the shape and performance of the elastomer. When the elastomer is deformed by external force, the structural support provided by PFAS-GO@SiO2 and the lubricating effect of boron nitride help to reduce internal friction and energy loss, so that the elastomer can recover to the original shape faster, improving the elastic recovery ability. DETAILED DESCRIPTION

[0022] The technical solutions of the present application are described below clearly and completely. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. It should be noted that the raw materials are commercially available. The thermoplastic polyurethane elastomer is a polyether type thermoplastic polyurethane elastomer, which is purchased from BASF Company in Germany, and the model number is 1180A. The vinyl silicone rubber is a methyl vinyl silicone rubber, which is purchased from Xin'an Company, and the model number is 110-3. The hydroxyl silicone oil is purchased from Jiangsu Quanli Company, and the model number is QL-203D. The ethylene-methyl acrylate copolymer is purchased from Arco Company, and the model number is Ax8900. The silicon dioxide is fumed silicon dioxide, which is purchased from Hubei Hui Fu Nanometer Material Co., Ltd., and the model number is HL-380. The graphene oxide is purchased from Suzhou Carbon Powder Graphite Technology Co., Ltd.

[0023] Embodiment 1

[0024] The present embodiment provides a thermoplastic silicone elastomer, which comprises the following raw materials by weight: 100 parts of thermoplastic polyurethane elastomer, 50 parts of vinyl silicone rubber, 22 parts of PFAS-GO@SiO2, 7 parts of boron nitride, 1.6 parts of curing agent 2,5-dimethyl-2,5-bis(tert-butyl peroxy)hexane, 2.5 parts of hydroxyl silicone oil, and 7 parts of ethylene-methyl acrylate copolymer.

[0025] The preparation method of PFAS-GO@SiO2 includes: dispersing 100g of SiO2 in 100g of graphene oxide aqueous dispersion with a concentration of 0.8mg / mL, immersing in a vacuum dryer, vacuumizing to a pressure of at least-0.1MPa, maintaining for 35min, then releasing, repeating 3 times; stirring at 42℃ and 120rpm for 11h, filtering, washing with deionized water until the filtrate is colorless, and vacuum drying at 80℃ for 24h to obtain a GO@SiO2 precursor; dispersing the GO@SiO2 precursor in ethanol with a solid content of 40g / L, adding 3g of heptadecafluorodecyltrimethoxysilane for reflux reaction, washing with ethanol by centrifugation for 3 times after the reaction is completed, and vacuum drying at 100℃ for 12h to obtain the product.

[0026] A preparation method of a thermoplastic silicone elastomer, which comprises the following steps: mixing vinyl silicone rubber, hydroxyl silicone oil, PFAS-GO@SiO2, and boron nitride, running at a low speed of 35rpm for 6min at a starting temperature of 65℃, increasing the temperature to 80℃, increasing the speed to 60rpm, and continuing to mix for 30min to obtain a master batch; mixing thermoplastic polyurethane elastomer, a curing machine, and the master batch, and then performing dynamic vulcanization at a temperature of 190℃ for 2min and a speed of 280rpm to obtain the product.

[0027] Example 2

[0028] The present embodiment provides a thermoplastic silicone elastomer, comprising the following raw materials by weight: 100 parts of thermoplastic polyurethane elastomer, 40 parts of vinyl silicone rubber, 20 parts of PFAS-GO@SiO2, 6 parts of boron nitride, 1.4 parts of vulcanizing agent 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane, 2 parts of hydroxyl silicone oil, and 6 parts of ethylene-methyl acrylate copolymer.

[0029] The preparation method of PFAS-GO@SiO2 includes: dispersing 100 g of SiO2 in an oxidized graphene water dispersion solution containing 50 g of oxidized graphene with a concentration of 0.5 mg / mL, immersing in a vacuum dryer, vacuumizing to a pressure of at least -0.1 MPa, maintaining for 30 min, then releasing, repeating 2 times; stirring at 40°C and 100 rpm for 10 h, filtering, washing with deionized water until the filtrate is colorless, and vacuum drying at 80°C for 24 h to obtain a GO@SiO2 precursor; dispersing the GO@SiO2 precursor in ethanol with a solid content of 35 g / L, adding 2 g of heptadecafluorodecyltrimethoxysilane for reflux reaction, after the reaction is completed, washing 3 times with ethanol by centrifugation, and vacuum drying at 100°C for 12 h to obtain the product.

[0030] A preparation method of a thermoplastic silicone elastomer, comprising the following steps: mixing vinyl silicone rubber, hydroxyl silicone oil, PFAS-GO@SiO2, and boron nitride, running at a low speed of 30 rpm for 5 min at a starting temperature of 60°C, increasing the temperature to 75°C, increasing the speed to 50 rpm, and continuing to mix for 25 min to obtain a master batch; mixing thermoplastic polyurethane elastomer, a vulcanizing machine, and the master batch, and then performing dynamic vulcanization at a temperature of 185°C for 1 min and a speed of 250 rpm to obtain the product.

[0031] Example 3

[0032] The present embodiment provides a thermoplastic silicone elastomer, comprising the following raw materials by weight: 100 parts of thermoplastic polyurethane elastomer, 60 parts of vinyl silicone rubber, 25 parts of PFAS-GO@SiO2, 8 parts of boron nitride, 1.8 parts of vulcanizing agent 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane, 3 parts of hydroxyl silicone oil, and 8 parts of ethylene-methyl acrylate copolymer.

[0033] The preparation method of PFAS-GO@SiO2 comprises the following steps: 100 g of SiO2 is dispersed in 150 g of graphene oxide water dispersion with a concentration of 1 mg / mL, and is immersed in a vacuum dryer, vacuumized to a pressure of at least -0.1 MPa, and kept for 40 min, and then released, and the above steps are repeated 4 times; stirring is performed at 45°C and 150 rpm for 12 h, and filtration is performed, and washing is performed with deionized water until the filtrate is colorless, and the GO@SiO2 precursor is obtained by vacuum drying at 80°C for 24 h; the GO@SiO2 precursor is dispersed in ethanol, the solid content is 45 g / L, 5 g of heptadecafluorodecyltrimethoxysilane is added for reflux reaction, after the reaction is completed, the product is washed by centrifugation with ethanol for 3 times, and the product is obtained by vacuum drying at 100°C for 12 h.

[0034] A preparation method of a thermoplastic silicone rubber, comprising the following steps: mixing vinyl silicone rubber, hydroxyl silicone oil, PFAS-GO@SiO2 and boron nitride, starting at a temperature of 70°C, running at a low speed of 40 rpm for 8 min, increasing the temperature to 85°C, increasing the speed to 70 rpm, and continuing to mix for 35 min to obtain a master batch; mixing the thermoplastic polyurethane elastomer, the vulcanizing machine and the master batch, and then performing dynamic vulcanization at a temperature of 195°C for 3 min and a speed of 300 rpm to obtain the product.

[0035] Comparative Example 1

[0036] Different from Example 1, in Comparative Example 1, 22 parts of PFAS-GO@SiO2 is replaced by an equal amount of unmodified SiO2, and the rest is the same as Example 1.

[0037] Comparative Example 2

[0038] Different from Example 1, in Comparative Example 2, 22 parts of PFAS-GO@SiO2 is replaced by an equal amount of unmodified graphene oxide, and the rest is the same as Example 1.

[0039] Comparative Example 3

[0040] Different from Example 1, in Comparative Example 3, in the preparation of PFAS-GO@SiO2, the refluxing step of heptadecafluorodecyltrimethoxysilane is omitted, and GO@SiO2 precursor is directly used as a filler in an amount of 22 parts, and the rest is the same as Example 1.

[0041] Comparative Example 4

[0042] Different from Example 1, in Comparative Example 4, in the preparation of GO@SiO2 precursor, the vacuum dryer immersion step (vacuumizing and releasing steps) is omitted, and only stirring is directly performed at 42°C and 120 rpm for 11 h, and the rest is the same as Example 1. Different from Example 1, in Comparative Example 4, in the preparation of GO@SiO2 precursor, the vacuum dryer immersion step (vacuumizing and releasing steps) is omitted, and only stirring is directly performed at 42°C and 120 rpm for 11 h, and the rest is the same as Example 1.

[0043] Comparative Example 5

[0044] Different from Example 1, in Comparative Example 5, 7 parts of boron nitride was omitted, keeping the total filler amount unchanged, i.e. PFAS-GO@SiO2 was increased to 29 parts, and the rest was the same as Example 1.

[0045] Comparative Example 6

[0046] Different from Example 1, in Comparative Example 6, in the preparation of PFAS-GO@SiO2, heptadecafluorodecyltrimethoxysilane was replaced with an equal amount of 3- aminopropyltriethoxysilane, and the rest was the same as Example 1.

[0047] Test Example 1: The performance of the thermoplastic silicone elastomers prepared in the foregoing Examples 1-3 and Comparative Examples 1-6 was explored, wherein 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 was 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; and the Taber abrasion resistance test method was GB / T 30314-2021.

[0048] The performance test results are shown in Table 1 below:

[0049] Table 1: Performance Test

[0050]

[0051] In combination with the above table, Examples 1-3 demonstrate optimized thermoplastic silicone elastomer formulations, in which PFAS-GO@SiO2 as a key modified filler, synergizes with boron nitride to provide excellent mechanical properties, thermal stability, and abrasion resistance. Example 1 serves as a benchmark with balanced performance; Examples 2 and 3 show slight fluctuations in performance by adjusting the proportions of raw materials, but the overall performance is good. Comparative Examples 1-6 verify the importance of PFAS-GO@SiO2 modification, vacuum impregnation steps, boron nitride addition, and silane types by changing specific ingredients or steps. The performance of all comparative examples is lower than that of Example 1, indicating that the formulation and process of Example 1 are optimal.

[0052] Comparative Example 1 uses unmodified SiO2 instead of PFAS-GO@SiO2, and the performance is significantly reduced, especially in tensile strength, tear strength, and abrasion resistance. Unmodified SiO2 has poor dispersibility and weak interfacial bonding with the polymer matrix, resulting in insufficient reinforcement effect. The compression set increases, indicating a decrease in elastic recovery. The heat distortion temperature is low, and the thermal stability is poor. This confirms the key role of PFAS-GO@SiO2 modification in improving the overall performance.

[0053] Comparative Example 2 uses unmodified graphene oxide instead of PFAS-GO@SiO2, and the performance is slightly improved compared to Comparative Example 1 but still lower than Example 1. Unmodified GO is prone to agglomeration and does not disperse uniformly in the matrix, leading to a decrease in mechanical properties. The elongation at break is high, but the strength is insufficient, indicating that GO has some reinforcing effect but cannot effectively exert a synergistic effect without loading and modification. The heat distortion temperature and abrasion resistance are poor, indicating that the use of GO alone is not ideal.

[0054] Comparative Example 3 uses GO@SiO2 precursor and omits PFAS modification, and the performance is significantly reduced, close to Comparative Example 1. After omitting the modification of heptadecafluorodecyltrimethoxysilane, the filler has strong hydrophilicity and poor compatibility with the hydrophobic polymer, resulting in weak interfacial bonding and reduced mechanical properties and thermal stability. The compression set is high, indicating poor dynamic vulcanization effect. This highlights the importance of heptadecafluorodecyltrimethoxysilane modification in improving the filler-polymer interface and hydrophobicity.

[0055] Comparative Example 4 omits the vacuum impregnation step, and the performance is lower than Example 1 but better than Comparative Examples 1-3. The vacuum impregnation step ensures that GO fully penetrates into the SiO2 pores, and the omission of this step leads to uneven GO loading and weak bonding, which weakens the reinforcing effect of the filler. The mechanical properties and abrasion resistance decrease, but the heat distortion temperature is less affected, indicating that the vacuum step is crucial for the structural integrity of the filler.

[0056] Comparative Example 5 omits boron nitride and increases PFAS-GO@SiO2, and the performance slightly decreases but changes relatively small. After omitting boron nitride, the mechanical properties such as tensile strength and tear strength are still high because the total filler amount remains unchanged. The compression set and abrasion resistance are slightly worse, indicating that boron nitride has an auxiliary role in improving elastic recovery and wear resistance. Overall, the synergistic effect of boron nitride and PFAS-GO@SiO2 can further enhance the performance.

[0057] Comparative Example 6 uses 3-aminopropyltriethoxysilane instead of heptadecafluorodecyltrimethoxysilane, and the performance decreases, especially in abrasion resistance and tear strength. Amino silane provides hydrophilic groups, which have poor compatibility with the hydrophobic components in the system, resulting in weak interfacial bonding. Fluorosilane has better hydrophobicity that matches the system better, which can better improve the mechanical properties and thermal stability. This indicates that the selection of silane type has a significant impact on filler modification and final performance.

[0058] Finally, it should be noted that the above examples are intended to illustrate the present application and are not intended to limit the technical solutions described in the present application; those of ordinary skill in the art should understand that the present application can still be modified or equivalently replaced; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application should be covered in the scope of the claims of the present application.

Claims

1. A thermoplastic silicone elastomer, characterized in that, The raw materials include the following parts by weight: 100 parts thermoplastic polyurethane elastomer, 40-60 parts vinyl silicone rubber, 20-25 parts PFAS-GO@SiO2, 6-8 parts boron nitride, 1.4-1.8 parts vulcanizing agent, 2-3 parts hydroxyl silicone oil, and 6-8 parts ethylene-methyl acrylate copolymer.

2. The thermoplastic silicone elastomer according to claim 1, characterized in that, The preparation method of PFAS-GO@SiO2 includes: dispersing SiO2 in an aqueous dispersion of graphene oxide, impregnating it in a vacuum dryer, stirring at 40-45℃ and 100-150rpm for 10-12h, filtering, washing and drying to obtain the GO@SiO2 precursor; dispersing the GO@SiO2 precursor in ethanol, adding heptadecafluorodecyltrimethoxysilane for reflux reaction, and washing and drying after the reaction is completed to obtain the final product.

3. The thermoplastic silicone elastomer according to claim 2, characterized in that, The specific surface area of ​​the SiO2 is 350-400 m². 2 / g.

4. The thermoplastic silicone elastomer according to claim 2, characterized in that, The concentration of the graphene oxide aqueous dispersion is 0.5-1 mg / mL.

5. A thermoplastic silicone elastomer according to claim 2, characterized in that, The weight ratio of SiO2, graphene and heptadecafluorodecyltrimethoxysilane is 100:50-150:2-5.

6. A thermoplastic silicone elastomer according to claim 2, characterized in that, The solid content of the GO@SiO2 precursor dispersed in ethanol is 35-45 g / L.

7. A thermoplastic silicone elastomer according to claim 2, characterized in that, The impregnation step in the vacuum dryer includes: evacuating to a pressure of at least -0.1 MPa, maintaining it for 30-40 minutes, and then releasing it, repeating this process 2-4 times.

8. The thermoplastic silicone elastomer according to claim 1, characterized in that, The vulcanizing agent is 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.

9. A method for preparing a thermoplastic silicone elastomer as described in any one of claims 1-8, characterized in that, step... include: Vinyl silicone rubber, hydroxyl silicone oil, PFAS-GO@SiO2, and boron nitride are mixed at an initial temperature of 60-70℃ and a low speed of 30-40 rpm for 5-8 minutes. The temperature is then raised to 75-85℃, the speed is increased to 50-70 rpm, and the mixture is continued to be mixed for 25-35 minutes to obtain the masterbatch. Thermoplastic polyurethane elastomer, thermoplastic polyurethane elastomer, vulcanizing machine, and masterbatch are then mixed and subjected to a dynamic vulcanization reaction to obtain the final product.

10. The method for preparing the thermoplastic silicone elastomer according to claim 9, characterized in that, The dynamic vulcanization temperature is 185-195℃, the time is 1-3 minutes, and the rotation speed is 250-300 rpm.

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