WO2023169042A1

WO2023169042A1 - High temperature-resistant damping thermoplastic silicone rubber material capable of being repeatedly processed, preparation method therefor, and use thereof

Info

Publication number: WO2023169042A1
Application number: PCT/CN2022/140385
Authority: WO
Inventors: 叶林铭; 陈平绪; 叶南彪; 李晟; 郑明嘉; 邱贤亮
Original assignee: 金发科技股份有限公司
Priority date: 2022-03-09
Filing date: 2022-12-20
Publication date: 2023-09-14
Also published as: CN114773849A; CN114773849B

Abstract

The present invention provides a high temperature-resistant damping thermoplastic silicone rubber material capable of being repeatedly processed, a preparation method therefor and the use thereof. The thermoplastic silicone rubber material comprises the following components in parts by weight: 20 to 40 parts of a thermoplastic component; 35 to 55 parts of silicone rubber; 5 to 20 parts of a plasticizer; 5 to 20 parts of a damping agent; 2 to 12 parts of a filler; 0.5 to 1 part of a crosslinking initiator; 0.5 to 1.5 parts of a crosslinking promoter; and 0 to 1.5 parts of other auxiliaries. The number average molecular weight of the damping agent is 150 to 8000, and the crosslinking promoter contains unsaturated fatty chains. The material has a good damping effect even at a high temperature, and the loss factor tanδ min at between -50°C and 150°C is greater than or equal to 0.45.

Description

A reproducible high-temperature damping thermoplastic silicone rubber material and its preparation method and application

Technical field

The invention belongs to the technical field of thermoplastic elastomers, and specifically relates to a repeatedly processable high-temperature-resistant damping thermoplastic silicone rubber material and its preparation method and application.

Background technique

Silicone rubber is based on -Si-O-Si- as the main chain. It is a special thermosetting rubber elastomer material with good properties such as high temperature resistance, cold resistance, ozone resistance, weather resistance, aging resistance, and electrical insulation. On the one hand, silicone rubber has poor damping effect at the working temperature of the workpiece (-50°C ~ 150°C) due to its large bond angle, large orientation freedom, and good flexibility. This is reflected in the loss modulus of the material ( The ratio of E") to its storage modulus (E') is low, and the loss factor tanδ is <0.2, which seriously limits its use in the field of damping and shock absorption. On the other hand, silicone rubber is a non-recyclable thermosetting elastomer. The problem of environmental pollution after disposal is particularly prominent. Therefore, the market demand for preparing an environmentally friendly (mainly recyclable and reprocessable) high-temperature-resistant damping thermoplastic silicone rubber material is increasing day by day.

Existing modification technologies to improve the damping effect of silicone rubber materials mainly include chemical modification, blending modification and interpenetrating network modification: 1) Chemical modification is mainly through graft copolymerization, front-stage copolymerization, random copolymerization, etc. This method introduces large-volume molecular side chains to the main molecular chain to increase the interaction between molecular chains and increase the internal friction of the material to improve the damping performance. Patents (CN102181056A, CN104761912A) disclose that introducing phenyl or special bulky groups into the side chains of the Si-O-Si main chain during molecular polymerization can only slightly improve the damping effect of the material. 2) In terms of blend modification, patents JP200247415, JP63297458, and US6777486 improve the damping effect by adding mineral fillers such as glass beads, graphite or mica to silicone rubber, but these fillers have poor compatibility with silicone rubber, making The material's resilience and mechanical properties deteriorate. 3) In terms of interpenetrating network modification, patent JP5859261 blends silicone rubber with chloroprene rubber and butyl rubber; patent US5624763 blends silicone rubber with acrylate rubber; due to the different compatibility and vulcanization rate between components Matching, the effective damping temperature range of the blend is narrow, and phase separation is easy to occur over time, and the performance of the blend becomes significantly worse. The above modification method is aimed at thermosetting damping silicone rubber materials, which has limitations in improving the damping effect of the material, and does not solve the environmental protection issues of the material.

In order to solve the recycling problem of rubber materials, thermoplastic elastomer materials have become a hot development topic in today's society. In the thermoplastic elastomer material modification technology, the dynamic vulcanization production process is used to prepare fully cross-linked or partially cross-linked thermosetting rubber particles as the dispersed phase, thermoplastic plastics or elastomers as the continuous phase, and thermoplastic materials with special sea-island structures. Rubber material. This type of alloy material not only retains the unique properties of rubber, but also gives the material thermoplasticity that can be reprocessed and used, thereby solving the shortcoming of rubber materials that cannot be recycled. Patents US6743868 and US6759487 use dynamic vulcanization technology to prepare thermoplastic vulcanized rubber with good touch and scratch resistance using thermoplastic polyamide, thermoplastic polyurethane as the continuous phase and silicone rubber as the dispersed phase respectively. Patent CN108164913A improves the use of dynamic vulcanization technology to prepare elastomer alloys with ABS and silicone rubber as the main base materials, with good resilience and comprehensive properties.

The damping performance of existing thermoplastic elastomer silicone rubber alloys at high temperatures is still poor (the current reported damping temperature range is up to 70°C), and there is no thermoplastic elastomer silicone rubber alloy with excellent damping performance at higher temperatures. . However, in reality, there are some applications that work in high-temperature environments and also require good damping and shock-absorbing effects, such as car engines, motors, or network server mats, which require high heat resistance and damping and shock-absorbing.

Therefore, there is an urgent need to develop a high-temperature-resistant damping thermoplastic silicone rubber material that can be processed repeatedly to broaden the application fields of the material.

Contents of the invention

The purpose of the present invention is to provide a high-temperature-resistant damping thermoplastic silicone rubber material that can be processed repeatedly in order to broaden the damping temperature of thermoplastic elastomer silicone rubber alloy, especially the upper limit of high temperature, and broaden the application field of the material.

Another object of the present invention is to provide a method for preparing the repeatedly processable high-temperature resistant damping thermoplastic silicone rubber material.

Another object of the present invention is to provide the application of the repeatedly processable high-temperature-resistant damping thermoplastic silicone rubber material in the preparation of automobile engines, electric motors or network server foot pads.

In order to achieve the above objects, the present invention adopts the following technical solutions:

A repeatedly processable high-temperature-resistant damping thermoplastic silicone rubber material, including components calculated according to the following parts by weight:

Wherein, the number average molecular weight of the damping agent is 150-8000; the cross-linking accelerator is a cross-linking accelerator containing unsaturated fatty chains.

In the system of the present invention, the silicone rubber component is fully cross-linked and evenly dispersed in the thermoplastic component, forming a "sea island structure", in which the silicone rubber component is the "island", the thermoplastic component is the "sea", and the small molecules The damping agent is grafted in situ into the "island structure" thermoplastic silicone rubber (TPSiV) system, which can evenly disperse the damping agent into the TPSiV system and improve the high-temperature damping effect of the material. Grafting the damping agent into the TPSiV system, on the one hand, promotes non-bonded complexation between molecular chain segments, and the physical cross-linking effect formed helps absorb vibration energy; on the other hand, it also introduces large-volume side chains to the molecular chains, This increases the relaxation resistance of the molecular segments and increases the internal friction during movement of the molecular segments. These two contributions significantly improve the damping effect of the material.

In silicone rubber systems containing thermoplastic components, in order to make the material have good damping properties at high temperatures, damping agents need to be added. However, existing damping agents have poor compatibility with thermoplastic components and cannot be added to TPSiV In the system, the inventor of the present invention creatively discovered that if a specific type of cross-linking accelerator is added to the TPSiV system and a damper with a smaller molecular weight is selected, under the joint action of the cross-linking accelerator and the cross-linking initiator, , the damping agent can be grafted in situ into the TPSiV system to improve the compatibility of the damping agent with thermoplastic elastomers and silicone rubber; and the cross-linking accelerator can also reduce the degradation of the thermoplastic elastomer by the cross-linking initiator, further Increasing the content of the thermoplastic elastomer component in the TPSiV system enables the material to withstand higher temperatures and still have a good damping effect at high temperatures. The loss factor tanδ _min ≥0.45 at temperatures between -50°C and 150°C.

Through further research, the present invention also found that with regard to the molecular weight of the damping agent, if the molecular weight of the selected damping agent is too small, even if it can be grafted into the TPSiV system, the damping effect will not be good; if the molecular weight of the damping agent is too large, the damping effect will be poor. The entanglement between its own molecular chains and intramolecular interactions are large and it cannot be grafted into the TPSiV system.

In order to further improve the damping performance at high temperatures of the prepared thermoplastic silicone rubber material, preferably, the number average molecular weight of the damping agent is 3,000 to 5,000. It should be noted that in the present invention, the number average molecular weight of the damping agent is measured according to the method of "ASTM D3598-1989".

The damping agent is a boron-oxygen damping agent or a damping agent containing a relatively large steric hindrance side group. Specifically, it can be polyborosiloxane (PBS) and its derivatives, boric acid (H ₃ BO ₃ ) and its derivatives, ethylene propylene diene terpolymer, styrene butadiene copolymer, acrylate copolymer or One or a combination of isobutylene and isoprene copolymers.

The cross-linking accelerator containing unsaturated fatty chains may be a polyester cross-linking accelerator, a polybutadiene cross-linking accelerator, a cyanate cross-linking accelerator, an isocyanate cross-linking accelerator or an acrylate. One or a combination of several cross-linking accelerators.

Preferably, the cross-linking accelerator is trimethylolpropane triacrylate (TMPTA), trimethylolpropane trimethacrylate, triallyl cyanurate, triolefin propyl isotrimer Cyanate ester, ethylene glycol diacrylate, ethylene glycol dimethacrylate, zinc dimethacrylate, zinc diacrylate, N,N′-p-phenylbismaleimide, triallyl cyanurate One or a combination of esters, triallyl isocyanurate or 1,2-polybutadiene.

Preferably, the thermoplastic component is polyolefin and/or polyolefin elastomer.

Optionally, the polyolefin is one or a combination of polypropylene or polyethylene.

Optionally, the polyolefin elastomer includes, but is not limited to, ethylene-propylene copolymer, ethylene-butylene copolymer, ethylene-octene copolymer, styrene-butadiene copolymer, styrene-butadiene copolymer. One or a combination of several hydrogenated copolymers.

Preferably, the silicone rubber is linear polydiorganosiloxane. Linear polydiorganosiloxane has -Si-O-Si- as the main chain, and two side groups are connected to Si atoms. Because the -Si-O-Si- main chain has high chemical bond energy and large bond length, it gives silicone rubber good high temperature resistance, low temperature resistance and weather resistance.

Further preferably, the linear polydiorganosiloxane is a phenyl-containing linear polydiorganosiloxane. Introducing phenyl groups to the side groups of polysiloxane destroys the regularity of the dimethylsiloxane structure and greatly reduces the crystallization temperature of the polymer. The working temperature of the resulting silica gel extends to -100°C. In the content range of 5 to 40wt%, the introduction of phenyl side groups increases the steric hindrance effect of the polysiloxane main chain during molecular motion, converting the kinetic energy of the molecular chain into heat energy for easy dissipation, thereby making the material more durable. The damping effect is significantly improved.

Optionally, the linear polydiorganosiloxane includes but is not limited to polydimethylsiloxane, polymethylphenylsiloxane, polydiphenylsiloxane, polymethylvinylsiloxane One or a combination of oxane, polyphenylvinylsiloxane, polymethylphenylvinylsiloxane or polymethyltrifluoropropylsiloxane.

Conventional cross-linking initiators can be used in the present invention. Preferably, the cross-linking initiator is a peroxide initiator, specifically dicumyl peroxide, tert-butyl peroxyisopropyl carbonate, 1,1-bis(tert-butylperoxy)-3 , 3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane (bis-tert-butylperoxy) or di-tert-butylperoxycumyl one or a combination of several.

In the present invention, a plasticizer can also be added as needed, and the plasticizer can be one or a combination of silicone oil, paraffin oil, naphthenic oil or aromatic hydrocarbon oil.

Depending on the application requirements, you can also choose to add fillers to increase the density and modulus of the material, or reduce costs. The filler may be one or a combination of silica, wollastonite, calcium carbonate, glass beads, talc, kaolin, diatomaceous earth, barium sulfate or mica.

The other auxiliaries are one or a combination of antioxidants, light stabilizers or lubricants.

Optionally, the antioxidant is 2,6-di-tert-butyl-4-methylphenol, antioxidant 1010, antioxidant 1076, antioxidant 1790, antioxidant 168 or antioxidant 626 one or a combination of several.

Optionally, the light stabilizer is a hindered amine light stabilizer and/or a triazine light stabilizer, preferably a compound of a hindered amine light stabilizer and a triazine light stabilizer in a weight ratio of 2:1. mixture.

The hindered amine light stabilizer can be light stabilizer 622, light stabilizer 770, light stabilizer 944, light stabilizer 783, light stabilizer 791, light stabilizer 3853, light stabilizer 292 or light stabilizer 123 one or a combination of several.

The triazine light stabilizer can be one or a combination of UV-234, UV-236 or UV-2373.

Optionally, the lubricant is one or a combination of vinyl bis stearamide, hydroxy fatty acid lubricant, erucamide, zinc stearate, magnesium stearate or polyethylene wax.

The preparation method of the repeatedly processable high-temperature resistant damping thermoplastic silicone rubber material includes the following steps:

S1. Mix thermoplastic elastomer, silicone rubber, damping agent, filler and other additives evenly to obtain a solid mixture;

S2. Mix the plasticizer, cross-linking initiator and cross-linking accelerator evenly to obtain a liquid mixture;

S3. Add the solid mixture obtained in S1. and the liquid mixture obtained in S2. into the extruder from different feeding ports, and perform extrusion and granulation at 120-190°C to obtain the repeatedly processable high-temperature resistant product. Damping thermoplastic silicone rubber material.

Preferably, the mixing is performed in a high-speed mixer, and the rotation speed of the high-speed mixer is 50 to 300 rpm.

Preferably, the extruder is a twin-screw extruder, the length-to-diameter ratio (L/D) of the twin-screw extruder is ≥56:1, and the rotation speed of the twin-screw extruder is 200-800 rpm.

The application of the above-mentioned repeatedly processable high-temperature-resistant damping thermoplastic silicone rubber material in the preparation of automobile engines, electric motors or network server foot pads is also within the protection scope of the present invention.

Compared with the prior art, the beneficial effects of the present invention are:

In the present invention, a specific type of cross-linking accelerator is added to the TPSiV system and a damping agent with a smaller molecular weight is selected. Under the joint action of the cross-linking accelerator and the cross-linking initiator, the damping agent can be grafted in situ to In the TPSiV system, the compatibility of the damping agent with the thermoplastic elastomer and silicone rubber can be improved, and a high-temperature-resistant damping thermoplastic silicone rubber material that can be repeatedly processed can be prepared. The material still has a good damping effect at high temperatures. - The loss factor tanδ ≥ 0.45 at a temperature of 50℃~150℃.

Detailed ways

The present invention will be further described below with reference to specific examples, but the examples do not limit the present invention in any form. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in this technical field. Unless otherwise stated, the reagents and materials used in the present invention are all commercially available.

Examples of the present invention use the following raw materials:

Thermoplastic component:

1#: Copolymer polypropylene, B8101, purchased from Yanshan Petrochemical;

2#: High-density polyethylene, HDPE500S, purchased from Yanshan Petrochemical;

Silicone Rubber:

1#: Polymethylvinylsiloxane (abbreviated as VMQ), DC-410, purchased from Dow Corning in the United States;

2#: Polymethylphenylvinylsiloxane (abbreviated as PVMQ), DC-440, phenyl content 10wt%, purchased from Dow Corning in the United States;

3#: Polymethylphenylvinylsiloxane (abbreviated as PVMQ), W-97, phenyl content 20wt%, purchased from Union Carbide Company of the United States;

4#: Polymethyltrifluoropropylsiloxane (abbreviated as FVMQ), LS-420, purchased from Dow Corning in the United States;

Damping agent:

1#: 4-Acetylbenzoic acid, molecular weight 164, purchased from Shanghai Bright Biotechnology Co., Ltd.;

2#: 4-benzyloxyphenylboronic acid, molecular weight 228, purchased from Shanghai Bright Biotechnology Co., Ltd.;

3#: Styrene-acrylate copolymer (OP 258 AS), molecular weight 500, purchased from INDULOR, Germany;

4#: Styrene butadiene copolymer (Kristalex 5140), molecular weight 3000, purchased from Eastman, USA;

5#: Polycarborane methylsiloxane (Dexsi l300), molecular weight is 5000, purchased from SIGMAALDRICH in the United States;

6#: Boric acid, molecular weight is 62, purchased from Shanghai Bright Biotechnology Co., Ltd.;

7#: Hydrogenated styrene butadiene copolymer, SEBS YH-688, molecular weight 100000, purchased from Yueyang Petrochemical;

Cross-linking initiator:

1#: 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, TRIGONOX 101, purchased from Aksu;

2#: Dicumyl peroxide, LUPEROX F40, purchased from Aksu;

Cross-linking accelerator:

1#: Trimethylolpropane triacrylate, TMPTA, purchased from Tianjin United Chemical;

2#: Triallyl isocyanurate, TAIC, purchased from Shanghai Fangruida Chemical Co., Ltd.;

3#: Polybutadiene with high vinyl content, Ricon 153, purchased from Cravelli;

4#: N,N′-p-phenylbismaleimide, PDM, purchased from Wuhan Zhisheng Technology Co., Ltd.;

Plasticizer: methylphenyl silicone oil, commercially available;

Filler: heavy calcium carbonate, commercially available;

Other additives:

Antioxidant 1010: commercially available;

Antioxidant 168: commercially available;

Light stabilizer UV-2373: commercially available.

Unless otherwise specified, certain components (such as plasticizers, fillers, antioxidants, light stabilizers) in the parallel examples and comparative examples of the present invention are all the same commercially available products.

Examples 1 to 17

This embodiment provides a series of repeatedly processable high-temperature-resistant damping thermoplastic silicone rubber materials, which are prepared according to the formulas in Tables 1 to 3 and a preparation method including the following steps:

S1. Add the thermoplastic components, silicone rubber, damping agents, fillers and other additives to a high-speed mixer and mix for 5 minutes. The speed of the high-speed mixer is 50-300 rpm. After uniform mixing, a solid mixture is obtained;

S2. Add the plasticizer, cross-linking initiator and cross-linking accelerator to the high-speed mixer and mix for 5 minutes. The speed of the high-speed mixer is 50-300 rpm. After mixing evenly, a liquid mixture is obtained;

S3. Add the solid mixture obtained in S1. from the feeding port of the first screw barrel into the twin-screw extruder (screw length-to-diameter ratio L/D = 56:1), and add the liquid mixture obtained in S2. from the third section. The feeding port of the fourth or fourth screw barrel is added to the twin-screw extruder at a temperature of 120 to 190°C (the temperatures in the ten zones of the twin-screw extruder from the feeding section to the machine head are 120°C and 140°C, respectively). , 180℃, 190℃, 190℃, 190℃, 190℃, 190℃, 190℃, 190℃, 190℃, 190℃, 190℃, 190℃), obtained by melt extrusion and granulation at a rotation speed of 200~800rpm .

Table 1 Contents (parts by weight) of each component in the repeatedly processable high-temperature resistant damping thermoplastic silicone rubber material of Examples 1 to 5

Table 2 Contents of each component (parts by weight) in the repeatedly processable high-temperature-resistant damping thermoplastic silicone rubber materials of Examples 6 to 10

Table 3 Contents of each component (parts by weight) in the repeatedly processable high-temperature resistant damping thermoplastic silicone rubber materials of Examples 11 to 17

Comparative example 1

This comparative example provides a thermoplastic silicone rubber material. The difference between the formula and Example 1 is that the damping agent is replaced with a 6# damping agent with a small molecular weight.

Comparative example 2

This comparative example provides a thermoplastic silicone rubber material. The difference between the formula and Example 1 is that the damping agent is replaced with a 7# damping agent with a large molecular weight.

Comparative example 3

This comparative example provides a thermoplastic silicone rubber material. The difference between the formula and Example 1 is that the cross-linking accelerator is replaced with a bismaleimide cross-linking accelerator that does not contain unsaturated fatty chains (i.e., N,N′-p-phenylbismaleimide).

Performance Testing

The properties of the thermoplastic silicone rubber materials prepared in the above embodiments and comparative examples were tested. The specific test items and methods are as follows:

1. Damping performance: Inject the thermoplastic silicone rubber material into a spline and test it using TA's DMA Q800 dynamic mechanical analyzer. Test conditions: multi-frequency-double cantilever beam mode, test temperature range -50℃~150℃, temperature rise The speed is 2℃/min, the frequency is 10Hz, take the minimum value tanδ _min in the test temperature range to compare the quality of the damping performance. The larger the tanδ value, the greater the material loss and the better the damping performance;

2. High temperature resistance and low compression performance: The compression permanent deformation of the material is tested according to the GB/T 7759.1-2015 standard. The smaller the test result value, the better the material maintains its resilience at high temperatures and the better its high temperature resistance.

The test results are detailed in Table 4.

Table 4 Performance test results

As can be seen from Table 4:

The repeatedly processable high-temperature-resistant damping thermoplastic silicone rubber material prepared in each embodiment of the present invention has good high-temperature resilience performance, and the compression permanent deformation under the conditions of 125°C×72h×25% is <60%, which can be as low as 40.3 %; It still has a good damping effect at high temperatures, and the loss factor tanδ ≥ 0.45 at -50°C ~ 150°C can be as high as 0.63.

The results of Example 1 and Example 6 show that conventional polyolefin elastomers can be used as thermoplastic elastomer components of the present invention, and the prepared materials have good high-temperature resilience and high-temperature damping effects.

The results of Example 1 and Examples 7 to 9 show that the material prepared from phenyl-containing linear polydiorganosiloxane as a silicone rubber component has significantly excellent high-temperature rebound performance and high-temperature damping effect; other materials are selected. Type siloxane (Examples 1 and 9) is used as the rubber component. Although the high-temperature rebound performance and high-temperature damping effect of the prepared material are satisfactory for use, its performance is slightly inferior to that of the phenyl-containing linear polydiorganic polymer. The difference in the high-temperature damping effect of silicone rubber components based on siloxane is more obvious.

The results of Example 1 and Example 10 show that conventional cross-linking initiators can be used in the present invention and have little impact on the properties of the material.

The results of Example 1 and Examples 11 to 15 show that Example 1 and Examples 11 to 12 used different types of damping agents with similar molecular weights (same order of magnitude), and the damping properties of the prepared materials were similar, indicating that in this In the grafted cross-linked thermoplastic silicone rubber system of the invention, the type of damping agent has little impact on the damping performance of the material; therefore, when the influence of the type of damping agent is ignored, the damping selected in Example 1 and Examples 13-14 As the molecular weight of the agent increases in sequence, the high-temperature compression resistance of the prepared material first becomes better and then becomes worse, and the high-temperature damping performance gradually becomes better.

In Comparative Example 1, due to the selection of 6# damping agent with a smaller molecular weight, although it can be grafted into the TPSiV system, the damping effect is poor; in Comparative Example 2, due to the selection of 7# damping agent with a larger molecular weight, the molecular chain of the damping agent itself is The entanglement and intramolecular interaction are large, making it impossible to graft into the TPSiV system, and the damping effect is also significantly poor.

The results of Example 1, Examples 15-16 and Comparative Example 3 show that the present invention selects a specific type of cross-linking accelerator to graft the damping agent into the TPSiV system to improve the high-temperature damping performance of the material.

The above-described specific embodiments further describe the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above-mentioned are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

A repeatedly processable high-temperature-resistant damping thermoplastic silicone rubber material, characterized in that it includes components calculated according to the following parts by weight:

Wherein, the number average molecular weight of the damping agent is 150-8000; the cross-linking accelerator is a cross-linking accelerator containing unsaturated fatty chains.
The repeatedly processable high-temperature resistant damping thermoplastic silicone rubber material according to claim 1, characterized in that the number average molecular weight of the damping agent is 3000-5000.
The reproducible high-temperature-resistant damping thermoplastic silicone rubber material according to claim 1, characterized in that the cross-linking accelerator is a polyester cross-linking accelerator, a polybutadiene cross-linking accelerator, a cyanate ester One or a combination of several types of cross-linking accelerators, isocyanate-based cross-linking accelerators or acrylate-based cross-linking accelerators.
The repeatedly processable high-temperature resistant damping thermoplastic silicone rubber material according to claim 1, wherein the thermoplastic component is polyolefin and/or polyolefin elastomer.
The repeatedly processable high-temperature-resistant damping thermoplastic silicone rubber material according to claim 1, wherein the silicone rubber is linear polydiorganosiloxane.
The repeatedly processable high-temperature-resistant damping thermoplastic silicone rubber material according to claim 5, characterized in that the silicone rubber is a phenyl-containing linear polydiorganosiloxane.
The repeatedly processable high-temperature resistant damping thermoplastic silicone rubber material according to claim 1, characterized in that the cross-linking initiator is a peroxide initiator.
The preparation method of the repeatedly processable high-temperature resistant damping thermoplastic silicone rubber material according to any one of claims 1 to 7, characterized in that it includes the following steps:

S1. Mix the thermoplastic components, silicone rubber, damping agents, fillers and other additives evenly to obtain a solid mixture;

S2. Mix the plasticizer, cross-linking initiator and cross-linking accelerator evenly to obtain a liquid mixture;

S3. Add the solid mixture obtained in S1. and the liquid mixture obtained in S2. into the extruder from different feeding ports, and perform extrusion and granulation at 120-190°C to obtain the repeatedly processable high-temperature resistant product. Damping thermoplastic silicone rubber material.
The method for preparing a repeatedly processable high-temperature resistant damping thermoplastic silicone rubber material according to claim 8, characterized in that the rotation speed of the extruder is 200 to 800 rpm.
The application of the repeatedly processable high temperature resistant damping thermoplastic silicone rubber material according to any one of claims 1 to 7 in the preparation of automobile engines, electric motors or network server foot pads.