Silicone rubber composite damping material and preparation method thereof

Abstract

The invention provides a silicone rubber composite damping material and a preparation method thereof. The damping material comprises the following components: poly-p-phenylene terephthamide carbon fiber and high-strength glass fiber modified silicone rubber, polysiloxane and hexafluorobutyl acrylate dual-modified ethylene propylene diene monomer rubber, polyimide and ultra-high molecular weight polyethylene dual-modified polyurethane rubber, polyimide carbon fiber and polydopamine dual-modified polyamide resin, a curing agent and a curing agent. Polyacrylamide modified bisphenol A epoxy resin, chitosan hydrochloride, nano-carbon modified silver fibers, chitin, organic rare earth, polydopamine, a plasticizer, a vulcanizing agent, an anti-aging agent, an accelerant, an assistant crosslinker, a reinforcing agent, alpha-olefin and silicon dioxide aerogel are included. The preparation method comprises the following steps: performing multiple modification on silicone rubber, mixing with modified resin, performing 60Co gamma-ray irradiation modification on the silicone rubber by alpha-olefin, and crosslinking the alpha-olefin and the silicone rubber to form a three-dimensional network structure, so that the tolerance of the silicone rubber to an extreme environment is improved, the application range is expanded, the application value is improved, and the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and particularly relates to a silicone rubber composite damping material and a preparation method thereof. Background Art

[0002] As an important class of polymer elastomer materials, silicone rubber has been widely used in many fields such as aerospace, aviation, electronics, and electrical appliances due to its excellent high and low temperature resistance, flexibility, electrical insulation, etc., especially in the fields that require heat dissipation and heat transfer. However, in recent years, with the rapid development of modern technology, the performance requirements for silicone rubber in all walks of life have become increasingly stringent. For example, in the power cable system, it is required that silicone rubber can work for a long time in an environment where the cable operating temperature is about 90 °C (the temperature rise may exceed 100 °C during a fault); in the field of new energy vehicles, since the battery generates heat during charging and discharging, it is required that components such as silicone rubber seals can still maintain good sealing performance and physical and chemical stability in an environment where the temperature is constantly 80 °C - 100 °C for a long time to ensure the safe operation of the battery system. The development of information technology has made people's demand and dependence on electronic products increase day by day. In this context, how to improve the safety of electronic products and their components and ensure the experience of people during daily use has received more and more attention.

[0003] Damping materials have been widely used in the field of automotive shock absorption. Specifically, the damping pad material is attached to the surface of automotive structural parts. The damping pad material can convert the mechanical vibration energy or sound energy transmitted by the automotive structural parts to which it is attached into heat energy or other forms of energy and dissipate it, thereby achieving the purpose of reducing vibration and noise, improving the vehicle's NVH performance, and enhancing the comfort of passengers.

[0004] Composite damping materials can be classified into asphalt-based damping materials and rubber-based damping materials according to the formula components. Asphalt-based damping materials are mixtures formed by taking asphalt as the main material and adding materials such as rubber and fibers. When asphalt-based damping materials are applied to automotive shock absorption, when the sheet metal structure in the vehicle vibrates under external force, due to the crisscross distribution of the fiber substances filled in the asphalt-based damping materials, the fiber substances will rub due to vibration, and the resulting internal friction force will convert the mechanical vibration energy into heat energy or other forms of energy and dissipate it, thus achieving a better vibration reduction and damping effect. However, the main material asphalt contained in asphalt-based damping materials is highly harmful to the environment, and it is easy to volatilize harmful gases to the human body when applied to automotive damping materials, and it has gradually been replaced by rubber-based damping materials. Rubber-based damping materials are mixtures formed by taking rubber as the main material and adding auxiliary materials such as polymer modified materials and inorganic fillers. Summary of the Invention

[0005] Aiming at the deficiencies of the above-mentioned existing technologies, the main purpose of the present invention is to provide a silicone rubber composite damping material and a preparation method thereof. First, the silicone rubber is subjected to multiple modifications using carbon fiber, glass fiber, acrylic acid, and silicone oxygen, and then other rubbers and resins that have also been modified are added for mixing. Then, α-olefin is used to irradiate and modify the silicone rubber through 60 Co γ-ray irradiation modification. The α-olefin cross-links with the silicone rubber to form a three-dimensional network structure, improving the tolerance of the silicone rubber to extreme environments. Then, by adding chitosan hydrochloride, nano-silver, chitin, organic rare earth, and polydopamine to strengthen the performance of the silicone rubber, the antibacterial, fireproof, and flame-retardant properties of the silicone rubber are greatly enhanced, expanding its application range, increasing its application value, and extending its service life.

[0006] To achieve the object of the present invention, the technical solution adopted is: A silicone rubber composite damping material, comprising the following components in parts by weight: 80-150 parts of poly(p-phenylene terephthalamide) carbon fiber and high-strength glass fiber modified silicone rubber, 20-50 parts of poly(dimethylsiloxane) and hexafluorobutyl acrylate double-modified ethylene-propylene-diene monomer rubber, 20-30 parts of polyimide and ultra-high molecular weight polyethylene double-modified polyurethane rubber, 10-30 parts of polyimide carbon fiber and polydopamine double-modified polyamide resin, 10-20 parts of poly(p-phenylene terephthalamide) carbon fiber and polyacrylamide double-modified bisphenol A epoxy resin, 1-3 parts of chitosan hydrochloride, 1-2 parts of nano-carbon modified silver fiber, 2-5 parts of chitin, 1-2 parts of organic rare earth, 1-2 parts of polydopamine, 2-8 parts of plasticizer, 2-5 parts of vulcanizing agent, 2-4 parts of antioxidant, 0.5-2.5 parts of accelerator, 2-10 parts of co-crosslinking agent, 10-60 parts of reinforcing agent, 5-30 parts of α-olefin, 10-30 parts of silica aerogel.

[0007] Preferably, the α-olefin is hexene, heptene, octene, nonene, decene, undecene, dodecene, tridecene, tetradecene, pentadecene, hexadecene, heptadecene or octadecene. In the present invention, the α-olefin is used to modify the silicone rubber composite damping material. The α-olefin crosslinks with the silicone rubber composite damping material to form a three-dimensional network structure, improving the tolerance of the silicone rubber composite damping material to extreme environments (from -40 °C to 200 °C), broadening the applicable range of the silicone rubber composite damping material in extreme environments and extending its service life. The α-olefin is used in the present invention to regulate the glass transition temperature of the silicone rubber composite damping material. Introducing a flexible α-olefin chain can significantly change the glass transition temperature of the silicone rubber composite damping material, mainly by increasing the flexibility of the molecular chain. This increase in flexibility makes the molecular chain easier to rotate and vibrate at low temperatures, thus lowering Tg. This is because the presence of flexible chain segments reduces the constraints between molecular segments, making the segments easier to thaw and start moving. Therefore, the introduction of flexible chain segments in the present invention reduces the regularity and crystallinity of the entire molecular chain, decreases the intermolecular interaction force, and enables the material to achieve free movement of the segments at a lower temperature.

[0008] Preferably, the reinforcing agent includes nanocellulose, carbon nanotubes, polyamide carbon fiber, and reinforcing glass fiber. The weight ratio of nanocellulose, carbon nanotubes, polyamide carbon fiber, and reinforcing glass fiber is 1-3:1:1-5:1-2. The reinforcing agent in the present invention can significantly improve the mechanical properties of the silicone rubber composite damping material.

[0009] Preferably, the co-crosslinking agent is 1,2-polybutadiene, triallyl isocyanurate, m-phenylene maleimide, hexamethylenebis(triethylenethiuram disulfide) or trimethylolpropane triacrylate. The co-crosslinking agent in the present invention helps to form a more stable crosslinked network structure, thereby improving the heat resistance and mechanical strength of the rubber.

[0010] Preferably, the plasticizer is phthalate, butyl oleate, glyceryl triacetate, epoxy soybean oil, butyl stearate or dioctyl sebacate. The main function of the plasticizer in the present invention is to weaken the intermolecular force of the polymer, lower the melting temperature and viscosity of the polymer, thereby improving the compatibility and processing performance of the silicone rubber composite damping material. In addition, the plasticizer can also reduce the hardness of the rubber, endow it with high elasticity and cold resistance, and thus improve the physical and mechanical properties of the final product.

[0011] Preferably, the vulcanizing agent is a metal oxide-based vulcanizing agent or a peroxide-based vulcanizing agent, the antioxidant is antioxidant RD or antioxidant MB, and the accelerator is accelerator D or accelerator M; in the present invention, the vulcanizing agent can cause rubber molecules to form a three-dimensional network structure, enhancing its mechanical strength and durability. The antioxidant can absorb harmful free radicals generated during the vulcanization process, reduce the scorching phenomenon, and extend the service life of the rubber. The antioxidant can also significantly affect the crosslinking density of the vulcanizate, thereby adjusting the aging resistance of the rubber; the accelerator can accelerate the vulcanization reaction, increase the vulcanization rate, and improve the properties of the vulcanizate.

[0012] A preparation method of the silicone rubber composite damping material based on the above, specifically including the following steps: S1. Internal mixing: First, mix poly(p-phenyleneterephthalamide) carbon fiber and high-strength glass fiber modified silicone rubber, polyorganosiloxane and acrylic hexafluorobutyl ester double-modified ethylene propylene diene monomer rubber, polyimide and ultra-high molecular weight polyethylene double-modified polyurethane rubber, polyimide carbon fiber and polydopamine double-modified polyamide resin, and poly(p-phenyleneterephthalamide) carbon fiber and polyacrylamide double-modified bisphenol A epoxy resin, and then crush them, with the crushing mesh number being 50-300 meshes. Then, mix chitosan hydrochloride, nano-carbon modified silver fiber, chitin, organic rare earth, and polydopamine and crush them, with the crushing mesh number being 100-300 meshes. Transfer the crushed materials into an internal mixer, heat up to the internal mixing temperature, and then add a plasticizer, a vulcanizing agent, an antioxidant, an accelerator, a co-crosslinking agent, a reinforcing agent, and silica aerogel for internal mixing. S2. Open mixing: Transfer the internally mixed rubber compound into an open mill, naturally cool the temperature to the open mixing temperature, and then conduct open mixing. The rotational speed ratio of the front and rear rollers during open mixing is 1-2:2-3, the open mixing temperature is 90-120 °C, and the rubber compound is passed through at least 3 times during open mixing. The open-mixed rubber compound is placed in an inert gas environment at 20-35 °C for 2-5 days. S3. Molding: Transfer the open-mixed rubber compound into a hot press and conduct hot press molding and cold press molding in sequence. The hot press molding temperature is 100-120 °C, the hot press molding time is 1-5 min, and the hot press molding pressure is 10-50 MPa; the cold press molding temperature is 20-30 °C, the cold press molding time is 10-15 min, and the cold press molding pressure is 20-80 MPa. S4. Irradiation: Mix the molded rubber compound with α-olefin and place it for 5-8 days, and irradiate it with 15 Co γ-rays with an irradiation dose of 300 kGy, an activity of 2.85×10 60 Bq, and an irradiation dose rate of 30 Gy / min. After irradiation, cut, trim, and test the rubber compound. If the test is qualified, the silicone rubber composite damping material is obtained.

[0013] Further, in step S1, the kneading temperature is 100-150 °C, the kneading time is 10-30 min, and the kneading speed is 20-100 rpm.

[0014] In the present invention, selecting a higher dose of γ-ray irradiation can significantly change the molecular structure and microscopic morphology of the material, thereby improving the high and low temperature resistance of the material; using 15 Co γ-rays with an activity of 2.85×10 60 Bq; 60 Co γ-rays have the characteristics of strong penetrability and high energy, and are suitable for processing materials with large sizes and complex structures. This type of γ-ray can penetrate deep into the material and uniformly change the microscopic structure of the material, thereby improving its high and low temperature resistance.

[0015] The present invention provides a silicone rubber composite damping material and its preparation method, which has the following advantages: The silicone rubber composite damping material of the present invention first performs multiple modifications on silicone rubber using carbon fiber, glass fiber, acrylic acid, and silicone, then adds other rubbers and resins that have also been modified for mixing, and then irradiates and modifies the silicone rubber with 60 Co γ-rays. The α-olefin crosslinks with the silicone rubber to form a three-dimensional network structure, improving the tolerance of the silicone rubber to extreme environments. Then, by adding chitosan hydrochloride, nano-silver, chitin, organic rare earth, and polydopamine to strengthen the performance of the silicone rubber, the antibacterial, fireproof, and flame-retardant properties of the silicone rubber are greatly enhanced, expanding its application range, increasing its application value, and extending its service life. Specific embodiments

[0016] The following further elaborates and explains the present invention with specific embodiments.

[0017] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further details the present invention with reference to the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships in the technical solution, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. Example 1

[0019] A silicone rubber composite damping material, comprising the following components in parts by weight: 150 parts of poly(p-phenylene terephthalamide) carbon fiber and high-strength glass fiber modified silicone rubber, 50 parts of polysiloxane and acrylic hexafluorobutyl ester double-modified ethylene propylene diene monomer rubber, 30 parts of polyimide and ultra-high molecular weight polyethylene double-modified polyurethane rubber, 30 parts of polyimide carbon fiber and polydopamine double-modified polyamide resin, 20 parts of poly(p-phenylene terephthalamide) carbon fiber and polyacrylamide double-modified bisphenol A epoxy resin, 3 parts of chitosan hydrochloride, 2 parts of nano-carbon modified silver fiber, 5 parts of chitin, 2 parts of organic rare earth, 2 parts of polydopamine, 8 parts of plasticizer, 5 parts of vulcanizing agent, 4 parts of antioxidant, 2.5 parts of accelerator, 10 parts of co-crosslinking agent, 60 parts of reinforcing agent, 30 parts of α-olefin, 30 parts of silica aerogel.

[0020] Among them, the α-olefin is hexene; the reinforcing agent includes nano-cellulose, carbon nanotubes, polyamide carbon fiber, and reinforcing glass fiber, and the weight ratio of nano-cellulose, carbon nanotubes, polyamide carbon fiber, and reinforcing glass fiber is 1:1:1:1; the co-crosslinking agent is triallyl isocyanurate; the plasticizer is butyl stearate; the vulcanizing agent is a metal oxide-based vulcanizing agent, the antioxidant is antioxidant RD, and the accelerator is accelerator M.

[0021] A preparation method of the above-mentioned silicone rubber composite damping material specifically includes the following steps: S1. Internal mixing: First, mix poly(p-phenylene terephthalamide) carbon fiber and high-strength glass fiber modified silicone rubber, polysiloxane and acrylic hexafluorobutyl ester double-modified ethylene propylene diene monomer rubber, polyimide and ultra-high molecular weight polyethylene double-modified polyurethane rubber, polyimide carbon fiber and polydopamine double-modified polyamide resin, and poly(p-phenylene terephthalamide) carbon fiber and polyacrylamide double-modified bisphenol A epoxy resin, and then crush them, with the crushing mesh number being 50-300 meshes. Then, mix chitosan hydrochloride, nano-carbon modified silver fiber, chitin, organic rare earth, and polydopamine and crush them, with the crushing mesh number being 100-300 meshes. Transfer the crushed materials into an internal mixer, heat up to the internal mixing temperature, and then add the plasticizer, vulcanizing agent, antioxidant, accelerator, co-crosslinking agent, reinforcing agent, and silica aerogel for internal mixing. S2. Open mixing: Transfer the internally mixed rubber compound into an open mill, naturally cool the temperature to the open mixing temperature, and then conduct open mixing. The front and rear roller speed ratios during open mixing are 1-2:2-3, the open mixing temperature is 90-120 °C, and the rubber compound is passed through at least 3 times during open mixing. The open-mixed rubber compound is placed in an inert gas environment at 20-35 °C for 2-5 days. S3. Molding: Transfer the kneaded rubber compound into a hot press and conduct hot press molding and cold press molding in sequence. The hot press molding temperature is 100 - 120 °C, the hot press molding time is 1 - 5 min, and the hot press molding pressure is 10 - 50 MPa; the cold press molding temperature is 20 - 30 °C, the cold press molding time is 10 - 15 min, and the cold press molding pressure is 20 - 80 MPa; S4. Irradiation: Place the molded rubber compound and α-olefin together for 5 - 8 days, and irradiate with Co γ-rays having an irradiation dose of 300 kGy, an activity of 2.85×10 15 Bq, and an irradiation dose rate of 30 Gy / min. After irradiation, cut, trim, and test the rubber compound. If the test is qualified, the silicone rubber conforming to the damping material is obtained. 60

[0022] Furthermore, in step S1, the kneading temperature is 100 - 150 °C, the kneading time is 10 - 30 min, and the kneading rotation speed is 20 - 100 rpm. Example 2

[0023] The difference between this example and Example 1 is as follows: A silicone rubber composite damping material, comprising the following components in parts by weight: 150 parts of poly(p-phenylene terephthalamide) carbon fiber and high-strength glass fiber modified silicone rubber, 20 parts of polysiloxane and hexafluorobutyl acrylate double-modified ethylene propylene diene monomer rubber, 20 parts of polyimide and ultra-high molecular weight polyethylene double-modified polyurethane rubber, 10 parts of polyimide carbon fiber and polydopamine double-modified polyamide resin, 10 parts of poly(p-phenylene terephthalamide) carbon fiber and polyacrylamide double-modified bisphenol A epoxy resin, 1 part of chitosan hydrochloride, 1 part of nano-carbon modified silver fiber, 2 parts of chitin, 1 part of organic rare earth, 1 part of polydopamine, 8 parts of plasticizer, 5 parts of vulcanizing agent, 4 parts of antioxidant, 2.5 parts of accelerator, 10 parts of co-crosslinking agent, 60 parts of reinforcing agent, 30 parts of α-olefin, 30 parts of silica aerogel.

[0024] Among them, the α-olefin is decene; the reinforcing agent includes nano-cellulose, carbon nanotubes, polyamide carbon fiber, and reinforcing glass fiber, and the weight ratio of nano-cellulose, carbon nanotubes, polyamide carbon fiber, and reinforcing glass fiber is 3:1:5:2; the co-crosslinking agent is m-phenylene maleimide; the plasticizer is epoxy soybean oil; the vulcanizing agent is a peroxide vulcanizing agent, the antioxidant is antioxidant MB, and the accelerator is accelerator M. Example 3

[0025] The differences between this example and Examples 1 and 2 are as follows: A silicone rubber composite damping material, comprising the following components in parts by weight: ​150 parts of poly(p-phenylene terephthalamide) carbon fiber and high-strength glass fiber modified silicone rubber, 50 parts of polysiloxane and hexafluorobutyl acrylate double-modified ethylene propylene diene monomer rubber, 30 parts of polyimide and ultra-high molecular weight polyethylene double-modified polyurethane rubber, 10 parts of polyimide carbon fiber and polydopamine double-modified polyamide resin, 100 parts of poly(p-phenylene terephthalamide) carbon fiber and polyacrylamide double-modified bisphenol A epoxy resin, 3 parts of chitosan hydrochloride, 2 parts of nano-carbon modified silver fiber, 5 parts of chitin, 2 parts of organic rare earth, 2 parts of polydopamine, 6 parts of plasticizer, 5 parts of vulcanizing agent, 4 parts of antioxidant, 2 parts of accelerator, 6 parts of co-crosslinking agent, 40 parts of reinforcing agent, 20 parts of α-olefin, 25 parts of silica aerogel.

[0026] Among them, the α-olefin is dodecene; the reinforcing agent includes nano-cellulose, carbon nanotubes, polyamide carbon fiber, and reinforcing glass fiber, and the weight ratio of nano-cellulose, carbon nanotubes, polyamide carbon fiber, and reinforcing glass fiber is 2:1:3:2; the co-crosslinking agent is triallyl isocyanurate; the plasticizer is phthalate; the vulcanizing agent is a metal oxide-based vulcanizing agent, the antioxidant is antioxidant MB, and the accelerator is accelerator D. Example 4

[0027] The differences between this example and Examples 1, 2, and 3 are as follows: A silicone rubber composite damping material, comprising the following components in parts by weight: 80 parts of poly(p-phenylene terephthalamide) carbon fiber and high-strength glass fiber modified silicone rubber, 50 parts of polysiloxane and hexafluorobutyl acrylate double-modified ethylene propylene diene monomer rubber, 30 parts of polyimide and ultra-high molecular weight polyethylene double-modified polyurethane rubber, 10 parts of polyimide carbon fiber and polydopamine double-modified polyamide resin, 10 parts of poly(p-phenylene terephthalamide) carbon fiber and polyacrylamide double-modified bisphenol A epoxy resin, 2 parts of chitosan hydrochloride, 1 part of nano-carbon modified silver fiber, 3 parts of chitin, 1 part of organic rare earth, 1 part of polydopamine, 6 parts of plasticizer, 4 parts of vulcanizing agent, 3 parts of antioxidant, 1.5 parts of accelerator, 7 parts of co-crosslinking agent, 45 parts of reinforcing agent, 23 parts of α-olefin, 19 parts of silica aerogel.

[0028] Among them, the α-olefin is hexadecene; the reinforcing agent includes nano-cellulose, carbon nanotubes, polyamide carbon fiber, and reinforcing glass fiber, and the weight ratio of nano-cellulose, carbon nanotubes, polyamide carbon fiber, and reinforcing glass fiber is 2:1:4:2; the co-crosslinking agent is hexamethylene bisthiuram disulfide; the plasticizer is butyl stearate; the vulcanizing agent is a peroxide-based vulcanizing agent, the antioxidant is antioxidant MB, and the accelerator is accelerator M. Example 5

[0029] The differences between this example and Examples 1, 2, 3, and 4 are as follows: A silicone rubber composite damping material, comprising the following components in parts by weight: 150 parts of poly(p-phenylene terephthalamide) carbon fiber and high-strength glass fiber modified silicone rubber, 20 parts of polysiloxane and hexafluorobutyl acrylate double modified ethylene propylene diene monomer rubber, 30 parts of polyimide and ultra-high molecular weight polyethylene double modified polyurethane rubber, 100 parts of polyimide carbon fiber and polydopamine double modified polyamide resin, 20 parts of poly(p-phenylene terephthalamide) carbon fiber and polyacrylamide double modified bisphenol A epoxy resin, 1 part of chitosan hydrochloride, 2 parts of nano-carbon modified silver fiber, 2 parts of chitin, 2 parts of organic rare earth, 1 part of polydopamine, 8 parts of plasticizer, 2 parts of vulcanizing agent, 4 parts of antioxidant, 0.5 part of accelerator, 10 parts of co-crosslinking agent, 10 parts of reinforcing agent, 30 parts of α-olefin, 10 parts of silica aerogel.

[0030] Among them, the α-olefin is octadecene; the reinforcing agent includes nano-cellulose, carbon nanotubes, polyamide carbon fiber, and reinforcing glass fiber, and the weight ratio of nano-cellulose, carbon nanotubes, polyamide carbon fiber, and reinforcing glass fiber is 3:1:3:1; the co-crosslinking agent is trimethylolpropane triacrylate; the plasticizer is dioctyl sebacate; the vulcanizing agent is a metal oxide vulcanizing agent, the antioxidant is antioxidant RD, and the accelerator is accelerator D.

[0031] In the present invention, the composite damping material is prepared by first using carbon fiber, glass fiber, acrylic acid, and polysiloxane to perform multiple modifications on silicone rubber, then adding other rubbers and resins that have also been modified for mixing, and then using α-olefin to irradiate and modify silicone rubber by 60 Co γ-ray irradiation. The α-olefin crosslinks with the silicone rubber to form a three-dimensional network structure, improving the tolerance of the silicone rubber to extreme environments. Then, by adding chitosan hydrochloride, nano-silver, chitin, organic rare earth, and polydopamine, the performance of the silicone rubber is strengthened, greatly enhancing the antibacterial, fireproof, and flame-retardant properties of the silicone rubber, expanding its application range, increasing its application value, and extending its service life.

[0032] The technical solutions disclosed in the embodiments of the present invention have been introduced in detail above. In this article, specific embodiments are used to elaborate on the principles and implementation methods of the embodiments of the present invention. The descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention; at the same time, for those of ordinary skill in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A silicone rubber composite damping material, characterized in that: The invention comprises the following components in parts by weight: 80-150 parts of poly(p-phenylene terephthalamide) carbon fiber and high-strength glass fiber modified silicone rubber, 20-50 parts of polysiloxane and hexafluorobutyl acrylate double modified ethylene propylene rubber, 20-30 parts of polyimide and ultra-high molecular weight polyethylene double modified polyurethane rubber, 10-30 parts of polyimide carbon fiber and polydopamine double modified polyamide resin, bisphenol A double modified by poly(p-phenylene terephthalamide) carbon fiber and polyacrylamide 10-20 parts of epoxy resin, 1-3 parts of chitosan hydrochloride, 1-2 parts of nano-carbon modified silver fiber, 2-5 parts of chitin, 1-2 parts of organic rare earth, 1-2 parts of polydopamine, 2-8 parts of plasticizer, 2-5 parts of vulcanizer, 2-4 parts of antioxidant, 0.5-2.5 parts of accelerator, 2-10 parts of cross-linking agent, 10-60 parts of reinforcing agent, 5-30 parts of α-olefin, and 10-30 parts of silica aerogel.

2. The silicone rubber composite damping material according to claim 1, characterized in that: The α-olefin is hexene, heptene, octene, nonene, decene, undecene, dodecene, tridecene, tetradecene, pentadecene, hexadecene, heptadecene or octadecene.

3. The silicone rubber composite damping material according to claim 1, characterized in that: The reinforcing agent comprises nano cellulose, carbon nano tubes, polyamide carbon fiber and reinforcing glass fiber, and the weight ratio of the nano cellulose, carbon nano tubes, polyamide carbon fiber and reinforcing glass fiber is 1-3:1:1-5:1-2.

4. The silicone rubber composite damping material according to claim 1, characterized in that: The auxiliary crosslinking agent is 1,2-polybutadiene, triallyl isocyanurate, metaphenylene maleimide, hexasulfide disuccinate or trimethylolpropane triacrylate.

5. The silicone rubber composite damping material according to claim 1, characterized in that: The plasticizer is phthalate, butyl oleate, triacetin, epoxidized soybean oil, butyl stearate or dioctyl sebacate.

6. The silicone rubber composite damping material according to claim 1, characterized in that: The vulcanizing agent is a metal oxide vulcanizing agent or a peroxide vulcanizing agent, the antioxidant is antioxidant RD or antioxidant MB, and the accelerator is accelerator D or accelerator M.

7. A method for preparing the silicone rubber composite damping material according to any one of claims 1 to 6, characterized in that: The preparation method specifically comprises the following steps: S1. Banburying: First, poly(p-phenylene terephthalamide) carbon fiber and high-strength glass fiber modified silicone rubber, polysiloxane and hexafluorobutyl acrylate double modified ethylene propylene diene rubber, polyimide and ultra-high molecular weight polyethylene double modified polyurethane rubber, polyimide carbon fiber and polydopamine double modified polyamide resin, poly(p-phenylene terephthalamide) carbon fiber and polyacrylamide double modified bisphenol A epoxy resin are mixed and crushed, and the crushing mesh number is 50 to 300 meshes, and then chitosan hydrochloride, nano-carbon modified silver fiber, chitin, organic rare earth, and polydopamine are mixed and crushed, and the crushing mesh number is 100 to 300 meshes, and the crushed material is moved into a banbury mixer and heated to the banburying temperature, and then a plasticizer, a vulcanizing agent, an antioxidant, an accelerator, a co-crosslinking agent, a reinforcing agent and a silica aerogel are added and mixed and banburying; S2. Open refining: the rubber compound after internal mixing is transferred to an open refining mill, and the temperature is naturally cooled to the refining temperature before refining. The front and rear roller speed ratio of the refining is 1-2:2-3, the refining temperature is 90-120 °C, and the refining is thinned at least 3 times. The rubber compound after refining is placed in an inert gas environment at 20-35 °C for 2-5 days; S3. Molding: The rubber compound after the open mill is moved into a hot press and then subjected to hot pressing and cold pressing. The hot pressing temperature is 100-120 °C, the hot pressing time is 1-5 min, and the hot pressing pressure is 10-50 MPa; the hot pressing temperature is 20-30 °C, the hot pressing time is 10-15 min, and the hot pressing pressure is 20-80 MPa; S4. Irradiation: The molded rubber is mixed with α-olefin and placed for 5 to 8 days, using an irradiation dose of 300 k Gy and an activity of 2.85×10 15 Bq, irradiation dose rate 30 Gy / min 60 Co γ-ray irradiation, the irradiated rubber material is cut, modified and tested, and the silicone rubber that passes the test is qualified as a damping material.

8. The method for preparing the silicone rubber composite damping material according to claim 7, characterized in that: The banburying temperature of the banburying in step S1 is 100-150° C., the banburying time is 10-30 min, and the banburying speed is 20-100 rpm.