Damping liquid silicone rubber composition, damping liquid silicone rubber material and preparation method thereof

Abstract

The invention provides a damping liquid silicone rubber material which is obtained by curing a damping liquid silicone rubber raw material composition, and also provides damping liquid silicone rubber and a preparation method thereof. The hardness and strength of the liquid silicone rubber material are improved through filling of the MQ silicon resin and the high-white carbon black, meanwhile, a large number of interface areas are formed by the nano-particles and a matrix, microcosmic slippage of the interfaces is generated under the action of dynamic stress, mechanical energy is converted into heat energy through friction and viscous effects between the interfaces and molecular chains, and damping is improved; according to the invention, by introducing methyl-terminated vinyl silicone oil, a silicone rubber chain forms a large number of suspension chain structures, energy dissipation is enhanced, hydrogen-containing chain extension is carried out at a use end, a main polymer has a longer free molecular chain segment to generate a friction effect, and the damping performance of the liquid silicone rubber material is further improved. Experimental results show that the liquid silicone rubber provided by the invention has excellent damping, mechanical and other properties under high hardness.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a damping liquid silicone rubber composition, a damping liquid silicone rubber material, and a method for preparing the same. Background Technology

[0002] Damping silicone rubber is a type of functional material that dissipates mechanical energy through inter-chain friction or filler interactions. Its core performance indicators include damping loss factor (tanδ), modulus, temperature resistance, and processing stability. With the increasing demand for damping silicone rubber in fields such as acoustics, flexible electronics, and precision instruments, traditional solid silicone rubber can no longer meet the performance requirements under complex working conditions, driving high-damping liquid silicone rubber to become a research hotspot.

[0003] Traditional silicone rubber, with polydimethylsiloxane (PDMS) as its main chain, possesses excellent weather resistance and flexibility, but its excessively flexible molecular chain results in a generally low damping loss factor. Current technologies primarily address this by adding damping modifiers and inorganic fillers.

[0004] Among the existing patents on damping silicone rubber, there are many reports on damping solid silicone rubber in acoustic or electronic and electrical fields, while there are fewer reports on damping liquid silicone rubber, especially damping liquid silicone rubber with high hardness (≥40A). Summary of the Invention

[0005] In view of this, the present invention provides a damping liquid silicone rubber composition, a damping liquid silicone rubber material and a method for preparing the same. The damping liquid silicone rubber material provided in this application has high hardness, high damping and excellent mechanical properties.

[0006] This application provides a damping liquid silicone rubber composition, comprising component A and component B;

[0007] Component A comprises: 50 to 100 parts by weight of base adhesive, 0 to 20 parts by weight of double-vinyl-terminated vinyl silicone oil, 0 to 20 parts by weight of methyl-terminated side vinyl silicone oil, and 0.01 to 1 part by weight of catalyst; wherein in component A, the double-vinyl-terminated vinyl silicone oil and the methyl-terminated side vinyl silicone oil are not both 0.

[0008] Component B comprises: 50 to 100 parts by weight of base adhesive, 0.01 to 20 parts by weight of double-ended vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side hydrogen-containing silicone oil, 0.01 to 15 parts by weight of end-containing hydrogen silicone oil, and 0.001 to 0.1 parts by weight of inhibitor;

[0009] The base adhesive comprises 50 to 150 parts by weight of double-ended vinyl silicone oil, 30 to 60 parts by weight of methyl-terminated side vinyl silicone oil, 0 to 2 parts by weight of an activating agent, 5 to 40 parts by weight of an additive, 50 to 150 parts by weight of silica, and 5 to 50 parts by weight of MQ silicone resin.

[0010] In some specific implementations, component A includes: 60 to 80 parts by weight of base adhesive, 0 to 15 parts by weight of double-vinyl-terminated vinyl silicone oil, 0 to 15 parts by weight of methyl-terminated side vinyl silicone oil, and 0.01 to 1 part by weight of catalyst; wherein in component A, the double-vinyl-terminated vinyl silicone oil and the methyl-terminated side vinyl silicone oil are not both 0;

[0011] Component B comprises: 60 to 80 parts by weight of base adhesive, 0.01 to 15 parts by weight of double-ended vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side vinyl silicone oil, 0.01 to 5 parts by weight of methyl-terminated side hydrogen-containing silicone oil, 0.01 to 10 parts by weight of end-containing hydrogen silicone oil, and 0.001 to 0.1 parts by weight of inhibitor;

[0012] The base adhesive comprises 50 to 120 parts by weight of double-ended vinyl silicone oil, 40 to 55 parts by weight of methyl-terminated side vinyl silicone oil, 0 to 2 parts by weight of an activating agent, 5 to 30 parts by weight of an additive, 80 to 120 parts by weight of silica, and 10 to 30 parts by weight of MQ silicone resin.

[0013] In some specific implementations, the vinyl content of the double-ended vinyl silicone oil is 0.1wt%~10wt%, and the viscosity is 100 mPa•s~200000 mPa•s;

[0014] The methyl-terminated side vinyl silicone oil has a vinyl content of 0.1wt% to 5wt% and a viscosity of 100 mPa•s to 200000 mPa•s.

[0015] The silica is fumed silica;

[0016] The MQ silicone resin is a vinyl MQ silicone resin;

[0017] The hydrogen atom content of the methyl-terminated side-group hydrogen-containing silicone oil is 0.1wt%~1wt%;

[0018] The hydrogen atom content of the hydrogen-containing silicone oil is 0.01wt%~0.2wt%;

[0019] The active treatment agent is divinyltetramethylsilazane;

[0020] The inhibitor is one or more of 1-ethynyl-1-cyclohexanol, 2-methyl-3-butynyl-2-ol, 3-methyl-1-ethynyl-3-ol or 3,5-dimethyl-1-hexynyl-3-ol;

[0021] The catalyst is a platinum catalyst;

[0022] The additives include one or more of hexamethyldisilazane, water, hydroxyl silicone oil, vinyl hydroxyl silicone oil, and vinyltriethoxysilane.

[0023] In some specific implementations, the specific surface area of ​​the silica is 200 m². 2 / g~500m 2 / g;

[0024] The number average molecular weight of the MQ silicone resin is 2000~5000; the molar ratio of M groups to Q groups in the MQ silicone resin is 0.5~0.9; and the vinyl content in the MQ silicone resin is 0.1wt%~5wt%.

[0025] In some specific implementations, the mass ratio of component A to component B is 1~5:1~5.

[0026] This application also provides a damping liquid silicone rubber material, obtained by curing a damping liquid silicone rubber raw material composition, wherein the damping liquid silicone rubber raw material composition comprises:

[0027] 50 to 80 parts by weight of double-ended vinyl silicone oil;

[0028] 30 to 50 parts by weight of methyl-terminated side-vinyl silicone oil;

[0029] 40 to 60 parts by weight of silica;

[0030] 5 to 15 parts by weight of MQ silicone resin;

[0031] 1 to 10 parts by weight of methyl-terminated side-group hydrogen-containing silicone oil;

[0032] 1 to 10 parts by weight of end-hydrogen-containing silicone oil;

[0033] 0-2 parts by weight of active treatment agent;

[0034] 5-15 parts by weight of additives;

[0035] 0.1 to 1 part by mass of catalyst;

[0036] Inhibitors in doses of 0.01 to 0.1 parts by weight.

[0037] The damping liquid silicone rubber raw material composition preferably includes:

[0038] 55 to 65 parts by weight of double-vinyl-terminated vinyl silicone oil;

[0039] 35 to 45 parts by weight of methyl-terminated side-vinyl silicone oil;

[0040] 40 to 60 parts by weight of silica;

[0041] 5 to 15 parts by weight of MQ silicone resin;

[0042] 4 to 10 parts by weight of methyl-terminated side-group hydrogen-containing silicone oil;

[0043] 4 to 10 parts by weight of end-hydrogen-containing silicone oil;

[0044] 0-2 parts by weight of active treatment agent;

[0045] 5-15 parts by weight of additives;

[0046] 0.1 to 1 part by mass of catalyst;

[0047] Inhibitors in doses of 0.01 to 0.1 parts by weight.

[0048] In some specific implementations, the vinyl content of the double-ended vinyl silicone oil is 0.1 wt% to 10 wt%.

[0049] The vinyl content of the methyl-terminated side-vinyl silicone oil is 0.1 wt% to 5 wt%.

[0050] The silica is fumed silica;

[0051] The MQ silicone resin is a vinyl MQ silicone resin;

[0052] The hydrogen atom content of the methyl-terminated side-group hydrogen-containing silicone oil is 0.1wt%~1wt%;

[0053] The hydrogen atom content of the hydrogen-containing silicone oil is 0.01wt%~0.2wt%;

[0054] The active treatment agent is divinyltetramethylsilazane;

[0055] The inhibitor is one or more of 1-ethynyl-1-cyclohexanol, 2-methyl-3-butynyl-2-ol, 3-methyl-1-ethynyl-3-ol or 3,5-dimethyl-1-hexynyl-3-ol;

[0056] The catalyst is a platinum catalyst;

[0057] The additives include one or more of hexamethyldisilazane, water, hydroxyl silicone oil, vinyl hydroxyl silicone oil, and vinyltriethoxysilane.

[0058] In some specific implementations, the specific surface area of ​​the silica is 200 m². 2 / g~500m 2 / g;

[0059] The number average molecular weight of the MQ silicone resin is 2000~5000; the molar ratio of M groups to Q groups in the MQ silicone resin is 0.5~0.9; and the vinyl content in the MQ silicone resin is 0.1wt%~5wt%.

[0060] This application also provides a method for preparing a damping liquid silicone rubber material, comprising the following steps:

[0061] 1) Mix 50 to 150 parts by weight of double-ended vinyl silicone oil, 30 to 60 parts by weight of methyl-terminated side vinyl silicone oil, 0 to 2 parts by weight of activating agent, 5 to 40 parts by weight of additives, 50 to 150 parts by weight of silica and 5 to 50 parts by weight of MQ silicone resin to obtain the base adhesive;

[0062] 2) Mix 50-100 parts by weight of base adhesive, 0-20 parts by weight of double-vinyl-terminated vinyl silicone oil, 0-20 parts by weight of methyl-terminated side vinyl silicone oil, and 0.01-1 parts by weight of catalyst to obtain component A; in component A, the double-vinyl-terminated vinyl silicone oil and the methyl-terminated side vinyl silicone oil are not both 0;

[0063] Component B is obtained by mixing 50 to 100 parts by weight of base adhesive, 0.01 to 20 parts by weight of double-ended vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side hydrogen-containing silicone oil, 0.01 to 15 parts by weight of end-containing hydrogen silicone oil, and 0.001 to 0.1 parts by weight of inhibitor.

[0064] 3) Mix and cure the components A and B to obtain a damping liquid silicone rubber material.

[0065] In some specific implementations, step 1) includes:

[0066] The double-ended vinyl silicone oil, the methyl-terminated side vinyl silicone oil, the activating agent and the additives are mixed and then kneaded for the first time.

[0067] The composition obtained from the first kneading is kneaded a second time with silica;

[0068] The composition obtained from the second kneading is kneaded three times with MQ silicone resin to obtain the base adhesive.

[0069] In some specific implementations, the second kneading specifically includes:

[0070] The composition obtained from the first kneading is kneaded with silica at 20℃~25℃ and 80kPa~120kPa for 30min~90min, then heated to 100℃~300℃ and kneaded under vacuum for 1h~5h.

[0071] In some specific implementations, the first kneading is carried out at 20℃~25℃ and 80kPa~120kPa, and the kneading time is 5min~20min;

[0072] The third kneading is carried out at 100℃~300℃ under vacuum conditions, and the kneading time is 30min~90min.

[0073] In some specific implementations, in step 2), during the preparation of component A, the mixing is carried out under conditions of room temperature, vacuum, and stirring.

[0074] During the preparation of component B, the mixing is carried out under conditions of room temperature, vacuum, and stirring.

[0075] This application improves the hardness and strength of liquid silicone rubber materials by using MQ silicone resin and high-precision silica fillers. Simultaneously, the nanoparticles form numerous interfacial regions with the matrix. These interfaces undergo microscopic slippage under dynamic stress, converting mechanical energy into heat energy through friction and viscosity effects between the nanoparticles and molecular chains, thus enhancing damping. This application uses little or no active treatment agents, preventing silica from participating in the cross-linked network in a covalent form, thus enhancing the strain process of the nanofiller material and making it easier for slippage and other movements to occur, further improving damping performance. Furthermore, by introducing methyl-terminated vinyl silicone oil, this application creates numerous suspended chain structures in the silicone rubber chains, enhancing energy dissipation. Hydrogen-containing chain extenders at the application end allow the main polymer to have longer, free molecular chain segments that engage in friction, further improving the damping performance of the liquid silicone rubber material.

[0076] Furthermore, this application incorporates MQ silicone resin during the kneading stage, significantly improving the compatibility of MQ silicone resin with the silicone oil system. This allows MQ resin to entangle and interweave with the polysiloxane molecular chains, increasing the internal friction between the molecular chains and enabling the material to dissipate more mechanical energy during deformation, thereby enhancing the damping effect. Experimental results show that the liquid silicone rubber provided in this application exhibits excellent damping and mechanical properties at high hardness, and can be applied in fields such as acoustic diaphragms, precision instruments, and new energy vehicles. The process is simple and has broad market prospects. Detailed Implementation

[0077] It should be understood that the expression “one or more of…” individually includes each of the objects described after the expression, as well as various different combinations of two or more of the described objects, unless otherwise understood from the context and usage. The expression “and / or” combined with three or more described objects should be understood to have the same meaning, unless otherwise understood from the context.

[0078] The terms “including,” “having,” or “containing,” including the use of their grammatical synonyms, should generally be understood as open-ended and non-restrictive, for example, not excluding other unstated elements or steps, unless otherwise specifically stated or understood from the context.

[0079] It should be understood that the order of the steps or the order in which certain actions are performed is not important as long as the invention remains operational. Furthermore, two or more steps or actions can be performed simultaneously.

[0080] The use of any and all instances or exemplary language such as “e.g.” or “including” in this document is merely intended to better illustrate the invention and does not constitute a limitation on the scope of the invention. No language in this specification should be construed as indicating that any unclaimed element is essential to the practice of the invention.

[0081] Furthermore, the numerical ranges and parameters used to define the present invention are approximate values, and the relevant values ​​in the specific embodiments have been presented as precisely as possible. However, any value inevitably contains standard deviations due to individual test methods. Therefore, unless explicitly stated otherwise, it should be understood that all ranges, quantities, values, and percentages used in this disclosure are modified with the word "approximately". Here, "approximately" generally means that the actual value is within plus or minus 10%, 5%, 1%, or 0.5% of a specific value or range.

[0082] This application provides a damping liquid silicone rubber material, obtained by curing a damping liquid silicone rubber raw material composition, wherein the damping liquid silicone rubber raw material composition comprises:

[0083] 50 to 80 parts by weight of double-ended vinyl silicone oil;

[0084] 30 to 50 parts by weight of methyl-terminated side-vinyl silicone oil;

[0085] 40 to 60 parts by weight of silica;

[0086] 5 to 15 parts by weight of MQ silicone resin;

[0087] 1 to 10 parts by weight of methyl-terminated side-group hydrogen-containing silicone oil;

[0088] 1 to 10 parts by weight of end-hydrogen-containing silicone oil;

[0089] 0-2 parts by weight of active treatment agent;

[0090] 5-15 parts by weight of additives;

[0091] 0.1 to 1 part by mass of catalyst;

[0092] Inhibitors in doses of 0.01 to 0.1 parts by weight.

[0093] The damping liquid silicone rubber raw material composition preferably includes:

[0094] 55 to 65 parts by weight of double-vinyl-terminated vinyl silicone oil;

[0095] 35 to 45 parts by weight of methyl-terminated side-vinyl silicone oil;

[0096] 40 to 60 parts by weight of silica;

[0097] 5 to 15 parts by weight of MQ silicone resin;

[0098] 4 to 10 parts by weight of methyl-terminated side-group hydrogen-containing silicone oil;

[0099] 4 to 10 parts by weight of end-hydrogen-containing silicone oil;

[0100] 0-2 parts by weight of active treatment agent;

[0101] 5-15 parts by weight of additives;

[0102] 0.1 to 1 part by mass of catalyst;

[0103] Inhibitors in doses of 0.01 to 0.1 parts by weight.

[0104] The damping liquid silicone rubber material provided in this application is obtained by curing a composition comprising double-ended vinyl silicone oil, methyl-terminated side vinyl silicone oil, silica, MQ silicone resin, methyl-terminated side hydrogen-containing silicone oil, end hydrogen-containing silicone oil, activator, catalyst and inhibitor. It exhibits excellent damping and mechanical properties under high hardness and can be applied to acoustic diaphragms, precision instruments, new energy vehicles and other fields. The process is simple and has broad market prospects.

[0105] The raw materials used in this application for preparing damping liquid silicone rubber materials include vinyl silicone oil with double-ended vinyl groups. In some specific implementations, the vinyl content of the double-ended vinyl silicone oil is 0.1wt% to 10wt%, preferably 0.1wt% to 5wt%, more preferably 0.1wt% to 1wt%, and most preferably 0.1wt% to 0.5wt%, for example, it can be 0.1wt%, 0.2wt%, 0.23wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.8wt%, 0.9wt%, 1wt%, 5wt%, or 10wt%, etc. In this application, the vinyl content is the vinyl content in the silicone oil determined by iodometric titration.

[0106] In some specific implementations, the viscosity of the double-ended vinyl silicone oil at 25°C is 100 mPa·s to 200,000 mPa·s, preferably 1,000 mPa·s to 100,000 mPa·s, more preferably 10,000 mPa·s to 80,000 mPa·s, such as 1,000 mPa·s, 10,000 mPa·s, 20,000 mPa·s, 50,000 mPa·s, or 100,000 mPa·s.

[0107] In some specific implementations, the amount of the double-ended vinyl silicone oil is 50 to 80 parts by weight, preferably 55 to 65 parts by weight, more preferably 60 to 65 parts by weight, such as 55 parts by weight, 58 parts by weight, 60 parts by weight, 64 parts by weight, etc.

[0108] The raw materials used in this application for preparing damping liquid silicone rubber materials include methyl-terminated side-vinyl silicone oil. By introducing methyl-terminated side-vinyl silicone oil, this invention forms numerous suspended chain structures within the silicone rubber chain, thereby enhancing energy dissipation and improving damping performance.

[0109] In some specific implementations, the vinyl content of the methyl-terminated side-vinyl silicone oil is 0.1wt% to 5wt%, preferably 0.1wt% to 3wt%, more preferably 0.1wt% to 1wt%, for example, it can be 0.1wt%, 0.2wt%, 0.23wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.9wt%, 1wt%, 3wt%, or 5wt%, etc. In this application, the vinyl content is the vinyl content in the silicone oil determined by iodometric titration.

[0110] In some specific implementations, the viscosity of the methyl-terminated side vinyl silicone oil at 25°C can be 100 mPa·s to 200,000 mPa·s, preferably 1,000 mPa·s to 150,000 mPa·s, more preferably 5,000 mPa·s to 100,000 mPa·s, for example 1,000 mPa·s, 10,000 mPa·s, 20,000 mPa·s, 50,000 mPa·s, or 100,000 mPa·s.

[0111] In some specific implementations, the amount of the methyl-terminated side vinyl silicone oil is 30 to 50 parts by weight, preferably 35 to 45 parts by weight, more preferably 38 to 44 parts by weight, for example, 35 parts by weight, 38 parts by weight, 40 parts by weight, 42 parts by weight, 44 parts by weight, 45 parts by weight, etc.

[0112] The raw materials used in this application to prepare damping liquid silicone rubber materials include silica. High silica content improves the hardness and strength of the liquid silicone rubber. At the same time, the nanoparticles form a large number of interface regions with the matrix. These interfaces generate micro-slip under dynamic stress, and convert mechanical energy into heat energy through friction and viscosity effects between themselves and molecular chains, thereby improving damping.

[0113] In some specific implementations, the silica is fumed silica. In some specific implementations, the specific surface area of ​​the silica is 200 m². 2 / g~500m 2 / g, preferably 250m 2 / g ~400m 2 / g, more preferably 300m 2 / g ~350m 2 / g, for example, 200m 2 / g、220m 2 / g、240m 2 / g、280m 2 / g、300m 2 / g、320m 2 / g、340m 2 / g、380m 2 / g、400m 2 / g、460m 2 / g、500m 2 / g etc.

[0114] In some specific implementations, the amount of silica used is 40 to 60 parts by weight, preferably 45 to 55 parts by weight, such as 40, 43, 48, 52, 54, 58, and 60 parts by weight. The addition of a higher proportion of silica in this application increases the friction between fillers, further improving properties such as hardness and damping.

[0115] The raw materials used in this application for preparing damping liquid silicone rubber materials include MQ silicone resin, which can provide crosslinking points, thereby improving the hardness and strength of the liquid silicone rubber. In some specific implementations, the MQ silicone resin is vinyl MQ silicone resin. In some specific implementations, the number average molecular weight (Mn) of the MQ silicone resin is 2000~5000, preferably 2500~4500, more preferably 2800~4000, for example, it can be 2000, 2500, 3000, 3500, 4000, 4500, 5000, etc.

[0116] In some specific implementations, the molar ratio of M groups to Q groups in the MQ silicone resin can be 0.5 to 0.9, preferably 0.6 to 0.9, for example, 0.5, 0.6, 0.7, 0.8, 0.9 or 1.0.

[0117] In some specific implementations, the vinyl content of the MQ silicone resin is 0.1wt% to 10wt%, preferably 0.5wt% to 5wt%, more preferably 1wt% to 3wt%, for example, it can be 0.1wt%, 0.wt%, 1wt%, 2wt%, 3wt%, 4wt%, or 5wt%. In this application, the vinyl content is the vinyl content in the silicone oil determined by iodometric titration.

[0118] In some specific implementations, the amount of MQ silicone resin used is 5 to 15 parts by mass, preferably 8 to 13 parts by mass, such as 5 parts by mass, 6 parts by mass, 8 parts by mass, 10 parts by mass, 12 parts by mass, 15 parts by mass, etc.

[0119] MQ resin has a rigid structure and is difficult to dissolve in silicone oil. This application preferably adds MQ silicone resin during the kneading stage. During high-temperature kneading, MQ silicone resin and linear silicone oil form inter-transmission and entanglement structures, greatly improving the compatibility of MQ silicone resin and silicone oil systems. Furthermore, the vinyl group (Vi) of MQ silicone resin participates in the hydrosilylation reaction during the vulcanization stage, forming concentrated cross-linking points. The increased cross-linking density increases the internal friction between molecular chains, causing the material to dissipate more mechanical energy during deformation, thereby improving hardness and damping effect. In addition, the rigid spherical structure of MQ resin dispersed in the flexible silicone rubber matrix forms numerous "hard-soft" interfaces. Under dynamic stress, resin particles and rubber molecular chains undergo microscopic slippage, converting mechanical energy into heat energy dissipation through friction and viscosity effects, thereby improving damping and other properties. Therefore, MQ silicone resin can significantly improve the damping and other properties of silicone rubber through a dual mechanism of interfacial friction energy dissipation and cross-linking network hysteresis.

[0120] The raw materials used in this application for preparing damping liquid silicone rubber materials include methyl-terminated side-group hydrogen-containing silicone oil. In some specific implementations, the hydrogen atom content of the methyl-terminated side-group hydrogen-containing silicone oil is 0.1wt% to 1wt%, preferably 0.3wt% to 0.6wt%, for example, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.8wt%, 1.3wt%, or 1.8wt%. In this application, the hydrogen atom content is the hydrogen atom content in the silicone oil determined by iodometric titration.

[0121] In some specific implementations, the methyl-terminated side-group hydrogen-containing silicone oil has a viscosity of 10cs to 50cs at 25°C, preferably 15cs to 30cs, such as 10cs, 13cs, 18cs, 20cs, 25cs, 28cs, 32cs, etc.

[0122] In some specific implementations, the amount of the methyl-terminated side-group hydrogen-containing silicone oil is 1 part by mass to 10 parts by mass, preferably 4 parts by mass to 10 parts by mass, more preferably 5 parts by mass to 8 parts by mass, for example 4 parts by mass, 5 parts by mass, 6 parts by mass, 7 parts by mass, 8 parts by mass, 9 parts by mass or 10 parts by mass, etc.

[0123] The raw materials used in this application for preparing damping liquid silicone rubber materials include end-hydrogen-containing silicone oil. This application introduces end-hydrogen-containing silicone oil, which can control the crosslinking density and optimize the crosslinking network, making the crosslinking points of the silicone rubber more dispersed, and giving the main polymer longer free molecular chain segments, thereby increasing the energy loss caused by intramolecular friction and molecular chain movement to improve damping performance.

[0124] In some specific implementations, the hydrogen atom content of the end-hydrogen-containing silicone oil is 0.01wt% to 0.2wt%, preferably 0.01wt% to 0.1wt%, such as 0.02wt%, 0.04wt%, 0.06wt%, 0.1wt%, or 0.15wt%. In this application, the hydrogen atom content is the hydrogen atom content in the silicone oil determined by iodometric titration.

[0125] In some specific implementations, the viscosity of the end-hydrogen-containing silicone oil at 25°C is 50cs~100cs, preferably 70cs~90cs, such as 50cs, 58cs, 65cs, 73cs, 84cs, 85cs, 92cs, etc.

[0126] In some specific implementations, the amount of the end-hydrogen-containing silicone oil is 1 part by mass to 10 parts by mass, preferably 4 parts by mass to 10 parts by mass, more preferably 5 parts by mass to 8 parts by mass, for example 3 parts by mass, 4 parts by mass, 5 parts by mass, 5.5 parts by mass, 6 parts by mass, 7 parts by mass, 8 parts by mass, 9 parts by mass or 10 parts by mass, etc.

[0127] Hydrogen-containing silicone oil can form Si-O-Si covalent bonds with the silanol groups on the surface of fumed silica through hydrogen bonding or condensation reaction, which improves the dispersibility of silica and thus enhances processing stability, making up for the shortcomings of insufficient treatment of silica without or with a small amount of tetramethyldivinylsilazane.

[0128] The raw materials used in this application to prepare damping liquid silicone rubber materials do not include or include a small amount of active treatment agents, reducing the vinyl content on the surface of silica. This prevents silica from participating in the cross-linking network in a small amount or not at all in the form of covalent bonds, enhancing the strain process of the nanofiller material and making it easier for it to undergo slip and other movements, thereby further improving the damping performance. In some specific implementations, the active treatment agent is divinyltetramethylsilazane.

[0129] In some specific implementations, the amount of the active treatment agent is 0 to 2 parts by mass, such as 0 parts by mass, 0.25 parts by mass, 0.5 parts by mass, 0.6 parts by mass, 1 part by mass, or 2 parts by mass.

[0130] The raw materials used in this application for preparing damping liquid silicone rubber materials include a catalyst, which can be a platinum catalyst. This application does not impose any particular limitations on the catalyst, such as a catalyst whose main components are polysiloxane and platinum(O)divinyltetramethyldisiloxane. In some specific implementations, the amount of the catalyst is 0.1 parts by mass to 1 part by mass, preferably 0.2 parts by mass to 0.8 parts by mass, more preferably 0.4 parts by mass to 0.5 parts by mass, for example 0.1 parts by mass, 0.2 parts by mass, 0.3 parts by mass, 0.4 parts by mass, 0.5 parts by mass, 0.7 parts by mass, 0.9 parts by mass, etc.

[0131] The raw materials used in this application for preparing damping liquid silicone rubber materials include inhibitors, including but not limited to 1-ethynyl-1-cyclohexanol, 2-methyl-3-butynyl-2-ol, 3-methyl-1-ethynyl-3-ol, and 3,5-dimethyl-1-hexynyl-3-ol, etc., and may be one or more of them. When the inhibitor is a mixture of multiple substances, this application does not have a special limitation on the proportion of each specific substance, but 1-ethynyl-1-cyclohexanol is preferred. In some specific implementations, the amount of the inhibitor is 0.01 parts by mass to 0.1 parts by mass, preferably 0.03 parts by mass to 0.08 parts by mass, for example 0.01 parts by mass, 0.02 parts by mass, 0.03 parts by mass, 0.04 parts by mass, 0.05 parts by mass, 0.06 parts by mass, 0.08 parts by mass, and 0.1 parts by mass, etc.

[0132] The raw materials used in this application for preparing damping liquid silicone rubber materials include additives, which include, but are not limited to, hexamethyldisilazane, water, hydroxyl silicone oil, vinyl hydroxyl silicone oil, vinyltriethoxysilane, etc., and may be one or more of these, preferably a mixture of water, hydroxyl silicone oil, and hexamethyldisilazane. In some specific implementations, the amount of the additive is 5 parts by weight to 40 parts by weight, preferably 5 parts by weight to 30 parts by weight.

[0133] This application cures the above-mentioned damping liquid silicone rubber raw material composition to obtain a high-hardness damping liquid silicone rubber composition. This application does not have any special limitations on the curing process, and it can be cured at low temperature, medium temperature or high temperature.

[0134] The liquid silicone rubber material provided in this application has low viscosity and good damping and mechanical properties even at high hardness, meeting the performance requirements under complex working conditions. It can be applied to acoustic diaphragms, precision instruments, new energy vehicles and other fields. The process is simple and has broad market prospects.

[0135] This application also provides a method for preparing a damping liquid silicone rubber material, comprising the following steps:

[0136] 1) Mix 50 to 150 parts by weight of double-ended vinyl silicone oil, 30 to 60 parts by weight of methyl-terminated side vinyl silicone oil, 0 to 2 parts by weight of activating agent, 5 to 40 parts by weight of additives, 50 to 150 parts by weight of silica and 5 to 50 parts by weight of MQ silicone resin to obtain the base adhesive;

[0137] 2) Mix 50-100 parts by weight of base adhesive, 0-20 parts by weight of double-vinyl-terminated vinyl silicone oil, 0-20 parts by weight of methyl-terminated side vinyl silicone oil, and 0.01-1 parts by weight of catalyst to obtain component A; in component A, the double-vinyl-terminated vinyl silicone oil and the methyl-terminated side vinyl silicone oil are not both 0;

[0138] Component B is obtained by mixing 50 to 100 parts by weight of base adhesive, 0.01 to 20 parts by weight of double-ended vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side hydrogen-containing silicone oil, 0.01 to 15 parts by weight of end-containing hydrogen silicone oil, and 0.001 to 0.1 parts by weight of inhibitor.

[0139] 3) Mix and cure the components A and B to obtain a damping liquid silicone rubber material.

[0140] This application first prepares a base adhesive by mixing double-ended vinyl silicone oil, methyl-terminated side vinyl silicone oil, an active agent, additives, silica, and MQ silicone resin. MQ silicone resin is added during the kneading stage, which greatly improves the compatibility of MQ silicone resin with the silicone oil system. This causes MQ resin to entangle and interpenetrate with the polysiloxane molecular chains, increasing the internal friction between the molecular chains. This allows the material to dissipate more mechanical energy during deformation, thereby improving the damping effect.

[0141] Specifically, this application uses the following method to prepare the base adhesive:

[0142] The double-ended vinyl silicone oil, the methyl-terminated side vinyl silicone oil, the activating agent and the additives are mixed and then kneaded for the first time.

[0143] The composition obtained from the first kneading is kneaded a second time with silica;

[0144] The composition obtained from the second kneading is kneaded three times with MQ silicone resin to obtain the base adhesive.

[0145] This application first involves adding double-ended vinyl silicone oil, methyl-terminated side vinyl silicone oil, an active agent, and additives to a kneader for a first kneading. In some specific implementations, the first kneading is performed at 20°C to 25°C and 80 kPa to 120 kPa, with a kneading pressure preferably between 90 kPa and 110 kPa, more preferably 101 kPa; the kneading time is 5 min to 20 min, preferably 10 min to 15 min.

[0146] After the first kneading, the resulting composition is mixed with silica and then kneaded a second time. Specifically, this application first kneads the composition obtained from the first kneading with silica at 20℃~25℃ and 101kPa for 30min~90min, then raises the temperature to 100℃~300℃ and kneads under vacuum for 1h~5h. A typical operation is as follows: the composition obtained from the first kneading and silica are added to a kneader and kneaded at 20℃~25℃ and 80kPa~120kPa for 30min~90min, with a kneading pressure preferably 90kPa~110kPa, more preferably 101kPa; the kneading time is preferably 40min~80min; then the temperature is raised to 100℃~300℃, preferably to 150℃~250℃, and a vacuum is drawn to <-0.1MPa, maintaining the vacuum and continuing to knead for 1h~5h, preferably 2h~4h.

[0147] After the second kneading, the resulting product is mixed with MQ silicone resin for a third kneading. In some specific implementations, the third kneading is carried out at 100℃~300℃ under vacuum conditions for 30min~90min. In some specific implementations, the preferred temperature for the third kneading is 150℃~250℃, and the preferred time is 2h~4h.

[0148] After obtaining the base adhesive, it is mixed with double-vinyl-terminated vinyl silicone oil, methyl-terminated side vinyl silicone oil, and a catalyst to obtain component A; it is then mixed with double-vinyl-terminated vinyl silicone oil, methyl-terminated side vinyl silicone oil, methyl-terminated side hydrogen-containing silicone oil, terminal hydrogen-containing silicone oil, and an inhibitor to obtain component B. Specifically, component A is prepared by mixing the base adhesive with double-vinyl-terminated vinyl silicone oil, methyl-terminated side vinyl silicone oil, and a catalyst in a planetary mixer under ambient temperature, vacuum, and stirring conditions. Similarly, component B is prepared by mixing the base adhesive with double-vinyl-terminated vinyl silicone oil, methyl-terminated side vinyl silicone oil, methyl-terminated side hydrogen-containing silicone oil, terminal hydrogen-containing silicone oil, and an inhibitor in a planetary mixer under ambient temperature, vacuum, and stirring conditions.

[0149] After obtaining component A and component B, they are mixed and cured to obtain a high-hardness damping liquid rubber. In some specific implementations, the mass ratio of component A to component B is 1~5:1~5, preferably 1~2:1~2, and more preferably 1:1. This application does not have any special limitations on the curing method; low-temperature, medium-temperature, and high-temperature curing are all acceptable.

[0150] In some specific implementations, component A comprises: 50 to 100 parts by weight of base adhesive, 0 to 20 parts by weight of double-vinyl-terminated vinyl silicone oil, 0 to 20 parts by weight of methyl-terminated side vinyl silicone oil, and 0.01 to 1 part by weight of catalyst; wherein the double-vinyl-terminated vinyl silicone oil and the methyl-terminated side vinyl silicone oil are not simultaneously 0. Preferably, component A comprises: 60 to 80 parts by weight of base adhesive, 0 to 15 parts by weight of double-vinyl-terminated vinyl silicone oil, 0 to 15 parts by weight of methyl-terminated side vinyl silicone oil, and 0.01 to 1 part by weight of catalyst. Preferably, component A comprises: 65 to 75 parts by weight of base adhesive, 0 to 10 parts by weight of double-vinyl-terminated vinyl silicone oil, 0 to 10 parts by weight of methyl-terminated side vinyl silicone oil, and 0.01 to 1 part by weight of catalyst.

[0151] In some specific implementations, component B comprises: 50 to 100 parts by weight of base adhesive, 0.01 to 20 parts by weight of double-vinyl-terminated vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side-group hydrogen-containing silicone oil, 0.01 to 15 parts by weight of terminal hydrogen-containing silicone oil, and 0.001 to 0.1 parts by weight of inhibitor. Preferably, component B comprises: 60 to 80 parts by weight of base adhesive, 0.01 to 15 parts by weight of double-vinyl-terminated vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side vinyl silicone oil, 0.01 to 5 parts by weight of methyl-terminated side-group hydrogen-containing silicone oil, 0.01 to 10 parts by weight of terminal hydrogen-containing silicone oil, and 0.001 to 0.1 parts by weight of inhibitor. Preferably, component B comprises: 65 to 75 parts by weight of base adhesive, 0.01 to 10 parts by weight of double-ended vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side vinyl silicone oil, 0.01 to 5 parts by weight of methyl-terminated side hydrogen-containing silicone oil, 0.01 to 10 parts by weight of end-containing hydrogen silicone oil, and 0.001 to 0.1 parts by weight of inhibitor.

[0152] In some specific implementations, the base adhesive comprises 50 to 150 parts by weight of double-vinyl-terminated vinyl silicone oil, 30 to 60 parts by weight of methyl-terminated side vinyl silicone oil, 0 to 2 parts by weight of an activating agent, 5 to 40 parts by weight of an additive, 50 to 150 parts by weight of silica, and 5 to 50 parts by weight of MQ silicone resin. Preferably, the base adhesive comprises 50 to 120 parts by weight of double-vinyl-terminated vinyl silicone oil, 40 to 55 parts by weight of methyl-terminated side vinyl silicone oil, 0 to 2 parts by weight of an activating agent, 5 to 30 parts by weight of an additive, 80 to 120 parts by weight of silica, and 10 to 30 parts by weight of MQ silicone resin. Preferably, the base adhesive comprises 60 to 100 parts by weight of double-ended vinyl silicone oil, 45 to 50 parts by weight of methyl-terminated side vinyl silicone oil, 0 to 2 parts by weight of an activating agent, 10 to 20 parts by weight of an additive, 90 to 110 parts by weight of silica, and 10 to 30 parts by weight of MQ silicone resin.

[0153] In this scheme, the double-ended vinyl-terminated vinyl silicone oil, the methyl-terminated side vinyl silicone oil, the activating agent, the additives, the silica, the MQ silicone resin, the catalyst, the methyl-terminated side hydrogen-containing silicone oil, the end hydrogen-containing silicone oil, the additives and the inhibitors are as described above, and will not be repeated in this application.

[0154] This application incorporates MQ silicone resin during the kneading stage, significantly improving the compatibility of MQ silicone resin with the silicone oil system. Furthermore, the hardness and strength of the liquid silicone rubber are enhanced through the addition of MQ silicone resin and high-precision carbon black fillers. Simultaneously, the mechanical energy is converted into heat energy through the friction and viscosity effects between the nanoparticles themselves and the molecular chains, thereby improving damping. Controlling the amount of active agent added further enhances the friction between the nanoparticles themselves and the molecular chains, thus further improving damping performance. The introduction of methyl-terminated vinyl silicone oil results in the formation of numerous suspended chain structures in the silicone rubber chains, enhancing energy dissipation and further improving the damping performance of the liquid silicone rubber. The liquid silicone rubber prepared by this invention exhibits excellent damping and mechanical properties at high hardness, and can be applied in fields such as acoustic diaphragms, precision instruments, and new energy vehicles. The process is simple and has broad market prospects.

[0155] The present invention is further illustrated below with reference to the embodiments. The scope of protection of the present invention is not limited to the following embodiments.

[0156] The raw materials in the following examples and comparative examples are used according to the mass fraction. When weighing, the same unit of measurement can be used. Using the same multiple to scale up or down will not affect the properties of the final high-hardness damping liquid silicone rubber.

[0157] The MQ silicone resin used in the following examples and comparative examples is a vinyl MQ silicone resin with an M / Q group molar ratio of 0.65, an average molecular weight (Mn) of 2900, and a vinyl content of 2.15 wt%.

[0158] The vinyl silicone oils with dual vinyl-terminated ends in the following examples and comparative examples have a viscosity of 50,000 mPa·s at 25°C and a vinyl content of 0.23 wt%.

[0159] The methyl-terminated side-vinyl silicone oils in the following examples and comparative examples have a viscosity of 10000 mPa·s at 25°C and a vinyl content of 0.2 wt%.

[0160] The methyl-terminated side-group hydrogen-containing silicone oils in the following examples and comparative examples have a viscosity of 20 cs at 25°C and a hydrogen atom content of 0.36 wt%.

[0161] The viscosity of the hydrogen-containing silicone oil at 25°C is 90 cs, and the hydrogen atom content is 0.04 wt%.

[0162] The catalysts used in the following examples and comparative examples are all platinum catalysts, whose main components are polysiloxane and platinum (0)divinyltetramethyldisiloxane, and the amount added is 0.24 parts;

[0163] In the following examples and comparative examples, the inhibitor is 1-ethynyl-1-cyclohexanol, and the amount added is 0.04 parts;

[0164] The silica described in the following examples and comparative examples is fumed silica with a specific surface area of ​​300 m². 2 / g;

[0165] In the following examples and comparative examples, the additives are a mixture of water, hydroxyl silicone oil, and hexamethyldisilazane, with a weight ratio of 1.2:1:6.5.

[0166] The active agent used in the following examples and comparative examples is tetramethyldivinylsilazane;

[0167] The polyvinyl silicone oils in the following comparative examples have a viscosity of 2000 mPa·s at 25°C and a vinyl content of 2.42 wt%.

[0168] Example 1

[0169] Add 100 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes. Add 100 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour. Raise the kneader temperature to 200°C, evacuate to a vacuum level < -0.1 MPa, maintain the vacuum, and knead under vacuum for 3 hours. Add 20 parts of MQ silicone resin to the kneader, combine the kneaders, and continue kneading for 1 hour while maintaining the temperature and vacuum. Cool to room temperature to obtain the base resin.

[0170] 70 parts of base rubber, 7 parts of double-vinyl-terminated vinyl silicone oil, 13.8 parts of methyl-terminated side vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0171] 70 parts of base adhesive, 7 parts of double-ended vinyl silicone oil, 3.5 parts of methyl-terminated side vinyl silicone oil, 5 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end-containing hydrogen silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0172] After mixing components A and B at a mass ratio of 1:1 until homogeneous, and then heating and vulcanizing, a high-hardness damping liquid silicone rubber is obtained.

[0173] The composition of the liquid silicone rubber prepared in Example 1 is shown in Table 1:

[0174] Table 1. Composition of the liquid silicone rubber prepared in Example 1

[0175]

[0176] Example 2

[0177] Add 120 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes. Add 80 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour. Raise the kneader temperature to 200°C, evacuate to a vacuum level < -0.1 MPa, maintain the vacuum, and knead under vacuum for 3 hours. Add 20 parts of MQ silicone resin to the kneader, combine the kneaders, and continue kneading for 1 hour while maintaining the temperature and vacuum. Cool to room temperature to obtain the base resin.

[0178] 70 parts of base rubber, 2 parts of double-ended vinyl silicone oil, 13.8 parts of methyl-terminated side vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0179] 70 parts of base adhesive, 2 parts of double-ended vinyl silicone oil, 3.5 parts of methyl-terminated side vinyl silicone oil, 5 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end-containing hydrogen silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0180] After mixing components A and B at a mass ratio of 1:1 until homogeneous, the mixture is vulcanized at room temperature to obtain high-hardness damping liquid silicone rubber.

[0181] The composition of the liquid silicone rubber prepared in Example 2 is shown in Table 2:

[0182] Table 2. Composition of the liquid silicone rubber prepared in Example 2

[0183]

[0184] Example 3

[0185] Add 80 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes. Add 120 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour. Raise the kneader temperature to 200°C, evacuate to a vacuum level < -0.1 MPa, maintain the vacuum, and knead under vacuum for 3 hours. Add 20 parts of MQ silicone resin to the kneader, combine the kneaders, and continue kneading for 1 hour while maintaining the temperature and vacuum. Cool to room temperature to obtain the base resin.

[0186] 70 parts of base rubber, 12 parts of double-vinyl-terminated vinyl silicone oil, 13.8 parts of methyl-terminated side vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0187] 70 parts of base adhesive, 12 parts of double-ended vinyl silicone oil, 3.5 parts of methyl-terminated side vinyl silicone oil, 5 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end-containing hydrogen silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0188] After mixing components A and B at a mass ratio of 1:1 until homogeneous, the mixture is vulcanized at room temperature to obtain high-hardness damping liquid silicone rubber.

[0189] The composition of the liquid silicone rubber prepared in Example 3 is shown in Table 3:

[0190] Table 3. Composition of the liquid silicone rubber prepared in Example 3

[0191]

[0192] Example 4

[0193] Add 110 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes. Add 100 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour. Raise the kneader temperature to 200°C, evacuate to a vacuum level < -0.1 MPa, maintain the vacuum, and knead under vacuum for 3 hours. Add 10 parts of MQ silicone resin to the kneader, combine the kneaders, and continue kneading for 1 hour while maintaining the temperature and vacuum. Cool to room temperature to obtain the base resin.

[0194] 70 parts of base rubber, 4.5 parts of double-vinyl-terminated vinyl silicone oil, 13.1 parts of methyl-terminated side vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0195] 70 parts of base adhesive, 4.5 parts of double-vinyl-terminated vinyl silicone oil, 4.2 parts of methyl-terminated side vinyl silicone oil, 3.63 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end-hydrogen-containing silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0196] After mixing components A and B at a mass ratio of 1:1 until homogeneous, the mixture is vulcanized at room temperature to obtain high-hardness damping liquid silicone rubber.

[0197] The composition of the liquid silicone rubber prepared in Example 4 is shown in Table 4:

[0198] Table 4. Composition of the liquid silicone rubber prepared in Example 4

[0199]

[0200] Example 5

[0201] Add 90 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes. Add 100 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour. Raise the kneader temperature to 200°C, evacuate to a vacuum level < -0.1 MPa, maintain the vacuum, and knead under vacuum for 3 hours. Add 30 parts of MQ silicone resin to the kneader, combine the kneaders, and continue kneading for 1 hour while maintaining the temperature and vacuum. Cool to room temperature to obtain the base resin.

[0202] 70 parts of base rubber, 9.5 parts of double-vinyl-terminated vinyl silicone oil, 14.5 parts of methyl-terminated side vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0203] 70 parts of base adhesive, 9.5 parts of double-ended vinyl silicone oil, 2.8 parts of methyl-terminated side vinyl silicone oil, 6.37 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end-containing hydrogen silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0204] After mixing components A and B at a mass ratio of 1:1 until homogeneous, the mixture is vulcanized at room temperature and under heating to obtain high-hardness damping liquid silicone rubber.

[0205] The composition of the liquid silicone rubber prepared in Example 5 is shown in Table 5:

[0206] Table 5. Composition of the liquid silicone rubber prepared in Example 5

[0207]

[0208] Example 6

[0209] Add 99 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, 1 part of activator, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes. Add 100 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour. Raise the kneader temperature to 200°C, evacuate to a vacuum level < -0.1 MPa, maintain the vacuum, and knead under vacuum for 3 hours. Add 20 parts of MQ silicone resin to the kneader, combine the kneaders, and continue kneading for 1 hour while maintaining the temperature and vacuum. Cool to room temperature to obtain the base resin.

[0210] 70 parts of base rubber, 7.25 parts of double-vinyl-terminated vinyl silicone oil, 13.8 parts of methyl-terminated side vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0211] 70 parts of base adhesive, 7.25 parts of double-ended vinyl silicone oil, 3.5 parts of methyl-terminated side vinyl silicone oil, 5 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end-containing hydrogen silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0212] After mixing components A and B at a mass ratio of 1:1 until homogeneous, the mixture is vulcanized at room temperature to obtain high-hardness damping liquid silicone rubber.

[0213] The composition of the liquid silicone rubber prepared in Example 6 is shown in Table 6:

[0214] Table 6. Composition of the liquid silicone rubber prepared in Example 6

[0215]

[0216] Example 7

[0217] Add 98 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, 2 parts of activator, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes. Add 100 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour. Raise the kneader temperature to 200°C, evacuate to a vacuum degree < -0.1 MPa, maintain the vacuum, and knead under vacuum for 3 hours. Add 20 parts of MQ silicone resin to the kneader, combine the kneaders, and continue kneading for 1 hour while maintaining the temperature and vacuum. Cool to room temperature to obtain the base resin.

[0218] 70 parts of base rubber, 7.5 parts of double-vinyl-terminated vinyl silicone oil, 13.8 parts of methyl-terminated side vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0219] 70 parts of base adhesive, 7.5 parts of double-ended vinyl silicone oil, 3.5 parts of methyl-terminated side vinyl silicone oil, 5 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end-ended hydrogen-containing silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0220] After mixing components A and B at a mass ratio of 1:1 until homogeneous, the mixture is vulcanized at room temperature to obtain high-hardness damping liquid silicone rubber.

[0221] The composition of the liquid silicone rubber prepared in Example 7 is shown in Table 7:

[0222] Table 7. Composition of the liquid silicone rubber prepared in Example 7

[0223]

[0224] Comparative Example 1

[0225] Add 120 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes; add 100 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour; raise the temperature of the kneader to 200°C, evacuate to a vacuum degree < -0.1 MPa, maintain the vacuum, knead under vacuum for 4 hours, and cool to room temperature to obtain the base rubber;

[0226] 70 parts of base adhesive, 2 parts of double-ended vinyl silicone oil, 13.8 parts of methyl-terminated side vinyl silicone oil, 5 parts of MQ silicone resin, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0227] 70 parts of base adhesive, 2 parts of double-ended vinyl silicone oil, 3.5 parts of methyl-terminated side vinyl silicone oil, 5 parts of MQ silicone resin, 5 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end-hydrogen-containing silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0228] After mixing components A and B in a 1:1 mass ratio, the mixture is heated and vulcanized at room temperature to obtain liquid silicone rubber.

[0229] The composition of the liquid silicone rubber prepared in Comparative Example 1 is shown in Table 8:

[0230] Table 8. Composition of the liquid silicone rubber prepared in Comparative Example 1

[0231]

[0232] Comparative Example 2

[0233] 128 parts of double-ended vinyl silicone oil, 62 parts of methyl-terminated side vinyl silicone oil, and 10 parts of additives were added to a kneader and kneaded at room temperature for 10 minutes. 60 parts of silica were added to the kneader in batches, and the mixture was kneaded at room temperature for 1 hour. The kneader temperature was raised to 200°C, and a vacuum of <-0.1 MPa was applied. The mixture was kneaded under vacuum for 3 hours. 20 parts of MQ silicone resin were added to the kneader, and the mixture was kneaded under temperature and vacuum for another hour. The mixture was cooled to room temperature to obtain the base resin.

[0234] 70 parts of base adhesive, 10.8 parts of methyl-terminated side vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0235] 70 parts of base adhesive, 0.5 parts of methyl-terminated side vinyl silicone oil, 5 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end hydrogen-containing silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0236] After mixing components A and B in a 1:1 mass ratio, the mixture is heated and vulcanized at room temperature to obtain liquid silicone rubber.

[0237] The composition of the liquid silicone rubber prepared in Comparative Example 2 is shown in Table 9:

[0238] Table 9. Composition of the liquid silicone rubber prepared in Comparative Example 2

[0239]

[0240] Comparative Example 3

[0241] Add 72 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes. Add 128 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour. Raise the kneader temperature to 200°C, evacuate to <-0.1 MPa, maintain the vacuum, and knead under vacuum for 3 hours. Add 20 parts of MQ silicone resin to the kneader, combine the kneaders, and continue kneading for 1 hour while maintaining the temperature and vacuum. Cool to room temperature to obtain the base resin.

[0242] 70 parts of base rubber, 14 parts of double-ended vinyl silicone oil, 15.16 parts of methyl-terminated side vinyl silicone oil, 5 parts of MQ silicone resin, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0243] 70 parts of base adhesive, 14 parts of double-ended vinyl silicone oil, 2.14 parts of methyl-terminated side vinyl silicone oil, 5 parts of MQ silicone resin, 7.72 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end-hydrogen-containing silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0244] After mixing components A and B in a 1:1 mass ratio, the mixture is heated and vulcanized at room temperature to obtain liquid silicone rubber.

[0245] The composition of the liquid silicone rubber prepared in Comparative Example 3 is shown in Table 10:

[0246] Table 10 Composition of the liquid silicone rubber prepared in Comparative Example 3

[0247]

[0248] Comparative Example 4

[0249] Add 120 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes; add 100 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour; raise the temperature of the kneader to 200°C, evacuate to <-0.1MPa, maintain the vacuum, and knead under vacuum for 4 hours; cool to room temperature to obtain the base rubber;

[0250] 70 parts of base adhesive, 2 parts of double-ended vinyl silicone oil, 9.68 parts of methyl-terminated side vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0251] B. 70 parts of base rubber, 2 parts of double-ended vinyl silicone oil, 7.62 parts of methyl-terminated side vinyl silicone oil, 2.26 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end-containing hydrogen silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0252] After mixing components A and B in a 1:1 mass ratio, the mixture is heated and vulcanized at room temperature to obtain liquid silicone rubber.

[0253] The composition of the liquid silicone rubber prepared in Comparative Example 4 is shown in Table 11:

[0254] Table 11 Composition of the liquid silicone rubber prepared in Comparative Example 4

[0255]

[0256] Comparative Example 5

[0257] Add 80 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes. Add 100 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour. Raise the kneader temperature to 200°C, evacuate to <-0.1 MPa, maintain the vacuum, and knead under vacuum for 3 hours. Add 40 parts of MQ silicone resin to the kneader, combine the kneaders, and continue kneading for 1 hour while maintaining the temperature and vacuum. Cool to room temperature to obtain the base resin.

[0258] 70 parts of base rubber, 12 parts of double-ended vinyl silicone oil, 15.16 parts of methyl-terminated side vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0259] 70 parts of base adhesive, 12 parts of double-ended vinyl silicone oil, 2.14 parts of methyl-terminated side vinyl silicone oil, 7.74 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end-ended hydrogen-containing silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0260] After mixing components A and B in a 1:1 mass ratio, the mixture is heated and vulcanized at room temperature to obtain liquid silicone rubber.

[0261] The composition of the liquid silicone rubber prepared in Comparative Example 5 is shown in Table 12:

[0262] Table 12 Composition of the liquid silicone rubber prepared in Comparative Example 5

[0263]

[0264] Comparative Example 6

[0265] Add 97 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, 3 parts of activating agent, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes. Add 100 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour. Raise the kneader temperature to 200°C, evacuate to <-0.1 MPa, maintain the vacuum, and knead under vacuum for 3 hours. Add 20 parts of MQ silicone resin to the kneader, combine the kneaders, and continue kneading for 1 hour while maintaining the temperature and vacuum. Cool to room temperature to obtain the base resin.

[0266] 70 parts of base rubber, 7.75 parts of double-vinyl-terminated vinyl silicone oil, 13.8 parts of methyl-terminated side vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0267] 70 parts of base adhesive, 7.75 parts of double-ended vinyl silicone oil, 3.5 parts of methyl-terminated side vinyl silicone oil, 5 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end-containing hydrogen silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0268] After mixing components A and B in a 1:1 mass ratio, the mixture is heated and vulcanized at room temperature to obtain liquid silicone rubber.

[0269] The composition of the liquid silicone rubber prepared in Comparative Example 6 is shown in Table 13:

[0270] Table 13 Composition of the liquid silicone rubber prepared in Comparative Example 6

[0271]

[0272] Comparative Example 7

[0273] Add 100 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes. Add 100 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour. Raise the kneader temperature to 200°C, evacuate to <-0.1 MPa, maintain the vacuum, and knead under vacuum for 3 hours. Add 20 parts of MQ silicone resin to the kneader, combine the kneaders, and continue kneading for 1 hour while maintaining the temperature and vacuum. Cool to room temperature to obtain the base resin.

[0274] 70 parts of base rubber, 4.25 parts of double-vinyl-terminated vinyl silicone oil, 13.8 parts of methyl-terminated side vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0275] 70 parts of base adhesive, 9.75 parts of double-ended vinyl silicone oil, 3.5 parts of methyl-terminated side vinyl silicone oil, 5 parts of methyl-terminated side hydrogen-containing silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0276] After mixing components A and B at a mass ratio of 1:1 until homogeneous, the mixture is vulcanized at room temperature to obtain liquid silicone rubber.

[0277] The composition of the liquid silicone rubber prepared in Comparative Example 7 is shown in Table 14:

[0278] Table 14 Composition of the liquid silicone rubber prepared in Comparative Example 7

[0279]

[0280] Comparative Example 8

[0281] Add 150 parts of double-ended vinyl silicone oil and 10 parts of additives to a kneader and knead at room temperature for 10 minutes; add 100 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour; raise the kneader temperature to 200℃, evacuate to <-0.1MPa, maintain the vacuum, and knead under vacuum for 3 hours; add 20 parts of MQ silicone resin to the kneader, combine the kneaders, and continue kneading for 1 hour while maintaining the temperature and vacuum; cool to room temperature to obtain the base resin;

[0282] 70 parts of base adhesive, 20.8 parts of double-vinyl-terminated vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0283] 70 parts of base adhesive, 10.5 parts of double-vinyl-terminated vinyl silicone oil, 5 parts of methyl-terminated side-group hydrogen-containing silicone oil, 5.5 parts of end-hydrogen-containing silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0284] After mixing components A and B in a 1:1 mass ratio, the mixture is heated and vulcanized at room temperature to obtain liquid silicone rubber.

[0285] The composition of the liquid silicone rubber prepared in Comparative Example 8 is shown in Table 15:

[0286] Table 15 Composition of the liquid silicone rubber prepared in Comparative Example 8

[0287]

[0288] Comparative Example 9

[0289] Add 100 parts of double-ended vinyl silicone oil, 50 parts of methyl-terminated side vinyl silicone oil, and 10 parts of additives to a kneader and knead at room temperature for 10 minutes. Add 100 parts of silica in batches to the kneader, combine the kneaders, and knead at room temperature for 1 hour. Raise the kneader temperature to 200°C, evacuate to <-0.1 MPa, maintain the vacuum, and knead under vacuum for 3 hours. Add 20 parts of polyvinyl silicone oil to the kneader, combine the kneaders, and continue kneading for 1 hour while maintaining the temperature and vacuum. Cool to room temperature to obtain the base rubber.

[0290] 70 parts of base rubber, 7 parts of double-vinyl-terminated vinyl silicone oil, 13.8 parts of methyl-terminated side vinyl silicone oil, and 0.24 parts of catalyst were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component A.

[0291] 70 parts of base adhesive, 7 parts of double-ended vinyl silicone oil, 3.5 parts of methyl-terminated side vinyl silicone oil, 5 parts of methyl-terminated side hydrogen-containing silicone oil, 5.5 parts of end-containing hydrogen silicone oil, and 0.04 parts of inhibitor were added to a planetary mixer, combined, and stirred under vacuum at room temperature for 1 hour to obtain component B.

[0292] After mixing components A and B in a 1:1 mass ratio, the mixture is heated and vulcanized at room temperature to obtain liquid silicone rubber.

[0293] The composition of the liquid silicone rubber prepared in Comparative Example 9 is shown in Table 16:

[0294] Table 16 Composition of the liquid silicone rubber prepared in Comparative Example 9

[0295]

[0296] The performance of the liquid silicone rubber prepared in the comparative examples and the control examples was tested, and the results are shown in Table 17:

[0297] Table 17 Performance test results of silicone rubber obtained from the examples and comparative examples

[0298]

[0299] As shown in Table 17:

[0300] A comparison of Example 1 and Comparative Example 1 shows that the liquid silicone rubber prepared by adding MQ silicone resin in the kneading stage has better mechanical and damping properties than that prepared by adding it in a planetary mixer. This may be because the silicone resin added in the kneading stage forms a structure of mutual transfer and entanglement with the linear silicone oil through a high-temperature kneading process for a certain period of time, which greatly improves the compatibility between the silicone resin and the silicone oil system.

[0301] A comparison of Examples 1-3 with Comparative Examples 2-3 shows that, within a certain range, the higher the amount of silica, the greater the damping performance of the prepared liquid silicone rubber, initially increasing and then decreasing. The best damping performance was observed when 50 parts of silica were added. This may be because increasing the amount of silica enhances the friction between fillers, thereby increasing hardness and damping properties. The decrease in damping and mechanical properties after reaching a certain level may be due to the agglomeration of silica, leading to a reduction in the interfacial area involved in energy dissipation.

[0302] A comparison of Examples 1, 6, and 7 with Comparative Example 6 shows that adding little or no divinyltetramethylsilazane is beneficial to improving damping performance. The more divinyltetramethylsilazane added, the worse the damping performance. This may be because adding little or no divinyltetramethylsilazane reduces the vinyl content on the surface of silica, thereby reducing the chemical bond between the filler and the crosslinking network, thus improving the damping performance.

[0303] A comparison of Example 1 and Comparative Example 7 shows that the introduction of partially monofunctional hydrogen-terminated polydimethylsiloxanes increases the damping factor. This may be because partially monofunctional hydrogen-terminated polydimethylsiloxanes can regulate the crosslinking density and optimize the crosslinking network, making the crosslinking points of the silicone rubber more dispersed and the molecular chains more free, thereby increasing intra-chain friction and molecular chain movement, and increasing energy loss to improve damping performance.

[0304] A comparison of Example 1 and Comparative Example 8 shows that the introduction of methyl-terminated vinyl silicone oil can improve the damping performance of liquid silicone rubber. This may be because the addition of methyl-terminated vinyl silicone oil causes the silicone rubber chain to form a large number of suspended chain structures, which enhances energy dissipation and thus improves the damping performance.

[0305] A comparison of Examples 1, 1, and 9 shows that the liquid silicone rubber prepared with vinyl MQ silicone resin exhibits superior mechanical and damping properties at the same hardness compared to polyvinyl silicone oil. This may be because the vinyl MQ silicone resin provided by this invention can enhance the damping properties and rigidity of silicone rubber through a dual mechanism of hydrosilylation reaction, interfacial friction energy dissipation, and crosslinking network hysteresis.

[0306] The liquid silicone rubber prepared by this invention has low viscosity and good damping and mechanical properties even at high hardness, meeting the performance requirements under complex working conditions. It can be applied to acoustic diaphragms, precision instruments, new energy vehicles and other fields. The process is simple and has broad market prospects.

[0307] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and changes to the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection of this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A damping liquid silicone rubber composition, comprising component A and component B; Component A includes: 50 to 100 parts by weight of base adhesive, 0 to 20 parts by weight of double-ended vinyl silicone oil, 0 to 20 parts by weight of methyl-terminated side vinyl silicone oil, and 0.01 to 1 part by weight of catalyst; In component A, the amount of double-ended vinyl silicone oil and methyl-terminated side vinyl silicone oil is not both 0; Component B comprises: 50 to 100 parts by weight of base adhesive, 0.01 to 20 parts by weight of double-ended vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side hydrogen-containing silicone oil, 0.01 to 15 parts by weight of end-containing hydrogen silicone oil, and 0.001 to 0.1 parts by weight of inhibitor; The base adhesive comprises 50 to 150 parts by weight of double-ended vinyl silicone oil, 30 to 60 parts by weight of methyl-terminated side vinyl silicone oil, 0 to 2 parts by weight of an activating agent, 5 to 40 parts by weight of an additive, 50 to 150 parts by weight of silica, and 5 to 50 parts by weight of MQ silicone resin.

2. The damping liquid rubber according to claim 1, characterized in that, Component A comprises: 60 to 80 parts by weight of base adhesive, 0 to 15 parts by weight of double-vinyl-terminated vinyl silicone oil, 0 to 15 parts by weight of methyl-terminated side vinyl silicone oil, and 0.01 to 1 part by weight of catalyst; wherein in component A, the double-vinyl-terminated vinyl silicone oil and the methyl-terminated side vinyl silicone oil are not both 0. Component B comprises: 60 to 80 parts by weight of base adhesive, 0.01 to 15 parts by weight of double-ended vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side vinyl silicone oil, 0.01 to 5 parts by weight of methyl-terminated side hydrogen-containing silicone oil, 0.01 to 10 parts by weight of end-containing hydrogen silicone oil, and 0.001 to 0.1 parts by weight of inhibitor; The base adhesive comprises 50 to 120 parts by weight of double-ended vinyl silicone oil, 40 to 55 parts by weight of methyl-terminated side vinyl silicone oil, 0 to 2 parts by weight of an activating agent, 5 to 30 parts by weight of an additive, 80 to 120 parts by weight of silica, and 10 to 30 parts by weight of MQ silicone resin.

3. The damping liquid silicone rubber according to claim 1 or 2, characterized in that, The vinyl content of the double-ended vinyl silicone oil is 0.1wt%~10wt%, and the viscosity is 100 mPa•s~200000 mPa•s; The methyl-terminated side vinyl silicone oil has a vinyl content of 0.1wt% to 5wt% and a viscosity of 100 mPa•s to 200000 mPa•s. The silica is fumed silica; The MQ silicone resin is a vinyl MQ silicone resin; The hydrogen atom content of the methyl-terminated side-group hydrogen-containing silicone oil is 0.1wt%~1wt%; The hydrogen atom content of the hydrogen-containing silicone oil is 0.01wt%~0.2wt%; The active treatment agent is tetramethyldivinylsilazane; The inhibitor is one or more of 1-ethynyl-1-cyclohexanol, 2-methyl-3-butynyl-2-ol, 3-methyl-1-ethynyl-3-ol or 3,5-dimethyl-1-hexynyl-3-ol; The catalyst is a platinum catalyst; The additive is one or more of hexamethyldisilazane, water, hydroxyl silicone oil, vinyl hydroxyl silicone oil, and vinyltriethoxysilane.

4. The damping liquid silicone rubber according to claim 3, characterized in that, The specific surface area of ​​the silica is 200 m². 2 / g~500m 2 / g; The number average molecular weight of the MQ silicone resin is 2000~5000; the molar ratio of M groups to Q groups in the MQ silicone resin is 0.5~0.9; and the vinyl content in the MQ silicone resin is 0.1wt%~5wt%.

5. The damping liquid silicone rubber according to any one of claims 1 to 4, characterized in that, The mass ratio of component A to component B is 1~5:1~5.

6. A damping liquid silicone rubber material, obtained by curing a damping liquid silicone rubber raw material composition, wherein the damping liquid silicone rubber raw material composition comprises: 50 to 80 parts by weight of double-ended vinyl silicone oil; 30 to 50 parts by weight of methyl-terminated side-vinyl silicone oil; 40 to 60 parts by weight of silica; 5 to 15 parts by weight of MQ silicone resin; 1 to 10 parts by weight of methyl-terminated side-group hydrogen-containing silicone oil; 1 to 10 parts by weight of end-hydrogen-containing silicone oil; 0-2 parts by weight of active treatment agent; 5-15 parts by weight of additives; 0.1 to 1 part by mass of catalyst; Inhibitors in doses of 0.01 to 0.1 parts by weight.

7. The damping liquid silicone rubber material according to claim 6, characterized in that, The vinyl content of the double-ended vinyl silicone oil is 0.1wt%~10wt%; The vinyl content of the methyl-terminated side-vinyl silicone oil is 0.1 wt% to 5 wt%. The silica is fumed silica; The MQ silicone resin is a vinyl MQ silicone resin; The hydrogen atom content of the methyl-terminated side-group hydrogen-containing silicone oil is 0.1wt%~1wt%; The hydrogen atom content of the hydrogen-containing silicone oil is 0.01wt%~0.2wt%; The active treatment agent is tetramethyldivinylsilazane; The inhibitor is one or more of 1-ethynyl-1-cyclohexanol, 2-methyl-3-butynyl-2-ol, 3-methyl-1-ethynyl-3-ol or 3,5-dimethyl-1-hexynyl-3-ol; The catalyst is a platinum catalyst; The additive is one or more of hexamethyldisilazane, water, hydroxyl silicone oil, vinyl hydroxyl silicone oil, and vinyltriethoxysilane.

8. The damping liquid silicone rubber material according to claim 7, characterized in that, The specific surface area of ​​the silica is 200 m². 2 / g~300m 2 / g; The number average molecular weight of the MQ silicone resin is 2000~5000; the molar ratio of M groups to Q groups in the MQ silicone resin is 0.6~0.9; and the vinyl content in the MQ silicone resin is 0.1wt%~5wt%.

9. A method for preparing a damping liquid silicone rubber material, characterized in that, Includes the following steps: 1) Mix 50 to 150 parts by weight of double-ended vinyl silicone oil, 30 to 60 parts by weight of methyl-terminated side vinyl silicone oil, 0 to 2 parts by weight of activating agent, 5 to 40 parts by weight of additives, 50 to 150 parts by weight of silica and 5 to 50 parts by weight of MQ silicone resin to obtain the base adhesive; 2) Mix 50 to 100 parts by weight of base adhesive, 0 to 20 parts by weight of double-ended vinyl silicone oil, 0 to 20 parts by weight of methyl-terminated side vinyl silicone oil, and 0.01 to 1 part by weight of catalyst to obtain component A; In component A, the amount of double-ended vinyl silicone oil and methyl-terminated side vinyl silicone oil is not both 0; Component B is obtained by mixing 50 to 100 parts by weight of base adhesive, 0.01 to 20 parts by weight of double-ended vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side vinyl silicone oil, 0.01 to 10 parts by weight of methyl-terminated side hydrogen-containing silicone oil, 0.01 to 15 parts by weight of end-containing hydrogen silicone oil, and 0.001 to 0.1 parts by weight of inhibitor. 3) Mix and cure the components A and B to obtain a damping liquid silicone rubber material.

10. The preparation method according to claim 9, characterized in that, Step 1) includes: The double-ended vinyl silicone oil, the methyl-terminated side vinyl silicone oil, the activating agent and the additives are mixed and then kneaded for the first time. The composition obtained from the first kneading is kneaded a second time with silica; The composition obtained from the second kneading is kneaded three times with MQ silicone resin to obtain the base adhesive.

11. The preparation method according to claim 10, characterized in that, The second kneading specifically includes: The composition obtained from the first kneading is kneaded with silica at 20℃~25℃ and 80kPa~120kPa for 30min~90min, then heated to 100℃~300℃ and kneaded under vacuum for 1h~5h.

12. The preparation method according to claim 11, characterized in that, The first kneading is carried out at 20℃~25℃ and 80kPa~120kPa, and the kneading time is 5min~20min; The third kneading is carried out at 100℃~300℃ under vacuum conditions, and the kneading time is 30min~90min.

13. The preparation method according to claim 9, characterized in that, In step 2), during the preparation of component A, the mixing is carried out under conditions of room temperature, vacuum, and stirring. During the preparation of component B, the mixing is carried out under conditions of room temperature, vacuum, and stirring.

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