A silicone rubber composition and a damper prepared using the same

Abstract

The application belongs to the field of new materials, and particularly relates to a silicone rubber composition and a shock absorber prepared by using the silicone rubber composition. The silicone rubber composition comprises raw materials: compounded phenyl silicone rubber raw rubber, reinforcing agent, vulcanizing agent and auxiliary crosslinking agent; wherein the compounded phenyl silicone rubber raw rubber is compounded by methyl phenyl vinyl silicone rubber, diphenyl vinyl silicone rubber A and diphenyl vinyl silicone rubber B raw rubber in proportion. The shock absorber prepared by using the silicone rubber composition comprises a shock absorber metal framework and a silicone rubber composition integrally vulcanized and formed with the shock absorber metal framework. The application realizes that the shock absorber has a frequency drift of < 15% and a damping efficiency of > 75% in a working temperature range of -40 DEG C to 50 DEG C by compounding phenyl silicone rubber in a specific proportion. The provided shock absorber has a simple structure, high controllability, good load bearing capacity and damping and buffering effect, and is particularly suitable for wide-temperature-range and high-reliability damping and buffering requirements in the fields of aerospace and artillery.

Description

Technical Field

[0001] This invention belongs to the field of new materials, namely vibration damper manufacturing, and particularly relates to a silicone rubber composition and a vibration damper prepared using the same, as well as a method for preparing the vibration damper. Background Technology

[0002] Silicone rubber, due to the flexibility of its Si-O backbone, possesses excellent resistance to high and low temperatures, aging, ozone, and electrical insulation, making it an ideal matrix for vibration reduction and noise reduction in aerospace, nuclear industry, and precision instruments. Among these, phenyl silicone rubber, with its benzene rings introduced into the side groups, can further suppress low-temperature crystallization and provides additional internal friction through phenyl-phenyl interactions, making it a key material direction for wide-temperature-range vibration reduction.

[0003] However, existing publicly available silicone rubber technologies still have the following shortcomings: CN104725866A discloses a high-damping silicone rubber, which uses methyl vinyl silicone rubber to composite low-phenyl silicone rubber (phenyl content of about 8%) and adds a damping agent to increase drag. However, its phenyl content is in the low phenyl range, and its low-temperature anti-crystallization ability is limited. Moreover, it is only a material formulation and does not involve the structure and manufacturing of the shock absorber product.

[0004] CN112210216B discloses a high-damping phenyl silicone rubber (phenyl 10-30 mol%) and its application as a damping material for vibration dampers. It uses a damping filler masterbatch formed by blending TMPPD with polar rubber to improve damping in the room temperature range. However, this often leads to complex processes, increased costs, or decreased mechanical properties, and its technical solution does not cover specific vibration damper types and the two-stage vulcanization process window.

[0005] CN101962480A proposes a wide-temperature high-damping material based on low-phenyl silicone rubber. However, this material has low tensile strength and elongation at break, and is prone to damage when used in vibration dampers. It is only suitable for products in certain mild vibration environments and has insufficient buffering capacity for impact conditions.

[0006] CN118359932A proposes a method to improve damping by blending monophenyl / diphenyl vinyl silicone rubber. It utilizes monophenyl / diphenyl silicone rubber with different phenyl contents as raw rubber to achieve a high-phenyl silicone rubber compound. However, it only proposes one type of silicone rubber material. Although the material has high damping, it is not suitable for large impact conditions. Excessive damping may affect the buffering effect of the shock absorber. Furthermore, no complete solution has been found that combines it with a special stepped vulcanization process and the structure of the shock absorber product.

[0007] CN121592178A proposes a rubber vibration damper for an aerospace inertial navigation system. It uses low-phenyl silicone rubber as the main material and has a structure of "double boss metal insert co-vulcanization". It does not involve a two-stage processing technology. This vibration damper is mainly designed for vibration environments with small acceleration in aerospace flight environments. It cannot effectively buffer large impact conditions (acceleration > 500g).

[0008] Therefore, there is an urgent need for a vibration damping silicone rubber material that can achieve high strength and wide temperature range damping without the need for external damping agents, and with a reliable overall vibration damper structure, achieved solely through the compounding of phenyl silicone rubber itself. This invention aims to fill this gap. Summary of the Invention

[0009] This invention addresses the numerous shortcomings of existing technologies by providing a silicone rubber composition and a vibration damper prepared therefrom. The silicone rubber composition comprises the following raw materials in parts by weight: 100 parts of compounded phenyl silicone rubber raw rubber, 30-60 parts of reinforcing agent, 0.2-1.5 parts of vulcanizing agent, and 0.1-0.5 parts of co-crosslinking agent. The compounded phenyl silicone rubber raw rubber is composed of three methylphenyl vinyl silicone rubber raw rubbers with different phenyl contents blended in a specific ratio. The vibration damper includes a metal frame and the rubber composition integrally vulcanized therewith. This invention, through a specific ratio of compounded phenyl silicone rubber, enables the vibration damper to exhibit a frequency drift of <15% and a vibration reduction efficiency >75% within an operating temperature range of -40℃ to 50℃. The vibration damper of this invention has a simple structure, strong adjustability, and excellent load-bearing capacity and vibration damping effect, making it particularly suitable for wide-temperature-range, high-reliability vibration damping requirements in aerospace, artillery, and other fields.

[0010] The inventive concept of this invention is as follows: Based on the existing technology, the inventors ultimately decided that a complete technical system would be composed of three parts: "formula - process - structure," which together form the system. Formulation: Methylphenyl vinyl silicone rubber with medium phenyl content has poor damping performance (approximately 0.06 at around 50℃) but good processability. Methylphenyl vinyl silicone rubber with high phenyl content has improved damping, but its processability deteriorates with increasing phenyl content. Therefore, using only one type is insufficient to simultaneously meet the strength, damping, and processability requirements of a vibration damper. The inventors ultimately decided to use a specific ratio of methylphenyl vinyl silicone rubbers with different structures. The medium-phenyl-content raw rubber component (CGGX-120-15) provides flexibility, low-temperature performance, and processability, while the high-phenyl-content raw rubber components (CGGX-120-25 and CGGX-120-35) provide rigidity and damping. Through the interpenetration and synergistic effect of these two components at the molecular level, a "microphase separation" structure is formed, achieving a balance between performance and processability.

[0011] Process: A two-stage vulcanization process with stepped heating is adopted. The first stage of vulcanization sets the rubber shape while maintaining good adhesion to the metal skeleton; the second stage of vulcanization, through gradual heating, achieves the slow and uniform formation of complex cross-linked networks (including co-crosslinking between different chain segments), while completely removing low molecular weight substances, ultimately obtaining an elastomer with a more uniform internal structure, optimized cross-linking density, and best damping performance.

[0012] Structure: A sandwich-structure metal skeleton / rubber composite vibration damper was redesigned, featuring a central opening in the rubber core. Adjusting the structure of this central opening allows for the regulation of the damper's stiffness and deformation. The central opening's structure, including its diameter, shape, and arrangement, adjusts the degree of local constraint on the rubber, thereby altering the damper's equivalent stiffness and maximum allowable deformation under compression or shear conditions. Under the same load, a larger opening cross-sectional area results in less local constraint on the rubber, lower overall damper stiffness, and a greater achievable compression or shear stroke; conversely, a smaller opening cross-sectional area results in greater rubber constraint, greater damper stiffness, and a smaller stroke. Adjusting the central opening structure enables the design of the damper's stiffness curve, thus influencing its buffering performance to adapt to different impact conditions.

[0013] Based on the above inventive concept, the specific technical solution of this application is as follows: Firstly, a silicone rubber composition is provided, prepared from raw materials comprising the following parts by weight: The compound consists of 100 parts of phenyl silicone rubber raw rubber, 30-60 parts of reinforcing agent, 0.2-1.5 parts of vulcanizing agent, and 0.1-0.5 parts by weight of co-crosslinking agent; More preferably, the compounded phenyl silicone rubber raw rubber is composed of three different specifications of methylphenyl vinyl silicone rubber raw rubber, namely CGGX-120-15, CGGX-120-25 and CGGX-120-35 (all purchased from Zhonglan Chenguang Chemical Research and Design Institute Co., Ltd.), which are compounded in a mass ratio of (1.8-2.2):(0.9-1.1):(0.9-1.1). This ratio fully integrates the effects of each component raw rubber. CGGX-120-15 provides good processability for the rubber compound, while CGGX-120-25 and CGGX-120-35 provide damping and mechanical properties for the rubber compound. If the ratio of CGGX-120-25 to CGGX-120-35 is reduced, the damping performance will be insufficient and the shock absorber's buffering effect will be reduced. If the ratio of CGGX-120-25 to CGGX-120-35 is high, the rubber compound's processing performance will be too poor, the rubber compound will be too sticky, processing will be difficult, and the product qualification rate will be low.

[0014] The CGGX-120-15, by molar percentage, has a phenyl content of 10-19%, preferably 15%; the CGGX-120-25 has a phenyl content of 19%-29% and a vinyl content of 0.1%-0.2%, preferably 25% and 0.1%; and the CGGX-120-35 has a phenyl content of 29%-39% and a vinyl content of 0.1%-0.2%, preferably 35% and 0.1%.

[0015] The reason for favoring the above range is that both the damping peak value and the peak temperature increase with the increase of phenyl content. In practical applications, it is desirable to ensure a large damping while keeping the peak temperature as low as possible. Therefore, methylphenyl vinyl silicone rubber with phenyl content of 25% and 35% is preferred. Excessive vinyl content will lead to a decrease in tensile strength and tear strength, as well as a decrease in high-temperature damping. Therefore, the vinyl content in the methylphenyl vinyl silicone rubber with phenyl content of 25% and 35% is controlled between 0.1% and 0.2%, preferably 0.1%.

[0016] Furthermore, the CGGX-120-15, CGGX-120-25 and CGGX-120-35 are compounded in a mass ratio of 2:1:1. Tests have shown that this ratio achieves the best balance of damping performance, processability and strength, which can meet the requirements for using vibration dampers.

[0017] Furthermore, the reinforcing agent is one or more of fumed silica, precipitated silica, silica powder, and diatomaceous earth, preferably 50 parts by weight.

[0018] Furthermore, the vulcanizing agent is a peroxide vulcanizing agent, selected from one or more of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (bis-dipentane) and dicumyl peroxide (DCP).

[0019] Furthermore, the crosslinking agent is a peroxide vulcanizing agent selected from one of triallyl isocyanurate (TAIC), zinc dimethacrylate (ZDMA), and pentaerythritol tetraacrylate (PETA).

[0020] The above-mentioned rubber composition meets the following performance requirements: loss factor tanδ ≥ 0.2 in the temperature range of -40℃ to 50℃; Young's modulus change is less than one order of magnitude in the operating temperature range of -40℃ to 50℃; tensile strength ≥ 8MPa; elongation at break ≥ 350%. Compared with conventional silicone rubber, its damping is moderate (the loss factor of ordinary silicone rubber is about 0.06 at 50℃, and the loss factor of some high-damping silicone rubber formulations with added damping agents can reach 0.6 at 50℃, but higher damping performance is not necessarily better; under impact conditions, high damping can actually reduce the cushioning effect of the shock absorber). The strength and elongation of this formulation can meet the requirements of shock absorber use and can be used in conjunction with a metal frame to achieve better results.

[0021] The inventors further provided a vibration damper prepared using the above-mentioned silicone rubber composition, wherein the vibration damper is a sandwich structure of metal skeleton / rubber composite vibration damper, wherein the two sides are metal skeletons and the middle sandwich part is the above-mentioned silicone rubber composition.

[0022] Preferably, the metal frame is square or rectangular in shape, made of steel, aluminum alloy or titanium alloy, with a side length or length and width of 50-100mm and a thickness of 5-8mm.

[0023] The above-mentioned rubber composition is prepared into a square vibration damping block with a central opening; the thickness of the vibration damping block is 30-44mm, and the central opening can be of any shape, including but not limited to square, rounded square, rhombus, hexagon, honeycomb, etc. The shape of the opening is used to adjust the equivalent stiffness, stiffness curve and maximum compression stroke. Furthermore, the area of ​​the opening accounts for 20%-40% of the total area of ​​the side surface of the vibration damping block.

[0024] In the specific preparation process, a corresponding mold is designed according to the pre-designed shape of the shock absorber and the corresponding opening shape of the shock absorber block. This allows the rubber composition to form openings according to the shape of the mold during co-vulcanization molding. Furthermore, different opening structures (including shape, number, and size) can be achieved by changing the core.

[0025] The metal skeleton and the rubber composition are bonded together by an adhesive. The adhesive used is any one of Chemlok 8116-1, Chemlok 608, Cilbond 36, and Thinkbond236. The specific amount used can be determined on-site according to the actual bonding requirements. Generally, the coating thickness is controlled to be 7.6-17.8μm. The inventor will not elaborate further.

[0026] In addition, the inventors also provided a method for manufacturing the above-mentioned shock absorber, which specifically includes the following steps: (1) Mixing and compounding: Mix the compounded phenyl silicone rubber raw rubber with the reinforcing agent evenly to obtain the compounded rubber. After cutting it into sheets of about 4-6 mm, heat-treat it at 150℃±2℃ for 1-2 hours. (2) Vulcanization and resting: Add vulcanizing agent and crosslinking agent to the compound, mix evenly, and sheet out in thin strips. Let it rest at room temperature for 12-36 hours. (3) Co-curing molding: The rubber material obtained in step (2) and the metal skeleton after sandblasting, degreasing and applying adhesive are co-cured under pressure in a well-designed mold. The adhesive can be applied by brushing, spraying or dipping, but not limited to brushing, spraying or dipping. The curing temperature is 160-170℃, the curing pressure is 9-11MPa and the curing time is 30-45min. After curing, a phenyl silicone rubber vibration damper is obtained.

[0027] (4) Stepped post-vulcanization: The rubber shock absorber obtained in step (3) is subjected to stepped temperature rise and vulcanization. The stepped temperature rise and vulcanization includes: holding at 150-170℃ for 1-2 hours, then raising to 170-190℃ and holding for 1-2 hours, and finally raising to 190-210℃ and holding for 2-3 hours.

[0028] Conventional silicone rubber pure rubber parts are vulcanized at a fixed temperature (e.g., 200 degrees Celsius) for a fixed time (4 hours). However, the vibration damper provided in this application has a metal-rubber bond. The segmented heating can prevent the bond layer from being damaged by temperature shock. The first stage of vulcanization (step (3)) shapes the rubber and maintains a good bond with the metal skeleton. The second stage of vulcanization (step (4)) gradually increases the temperature to achieve the slow and uniform formation of the complex cross-linked network (including co-cross-linking between different chain segments), while completely removing low molecular weight substances, and finally obtaining an elastomer with a more uniform internal structure, optimized cross-linking density, and best damping performance.

[0029] The silicone rubber vibration damper prepared by the above method can meet the following performance requirements: Under a half-sine wave, with a peak impact acceleration of 500g and a pulse width of 2ms, the vibration reduction efficiency is >75%; after 200 impacts, the vibration damper frequency drift is ≤15%; within the operating temperature range of -40℃ to 50℃, the vibration damper frequency drift is ≤15%.

[0030] Existing silicone rubber vibration dampers typically have limited stroke, insufficient cushioning performance, and a damping effect of less than 60%. They are generally effective in only one direction, with poor performance in the other two directions, failing to achieve effective three-dimensional cushioning. The vibration damper designed in this invention, through the joint optimization of the silicone rubber composition and the damper structure, and a symmetrical four-corner installation method, achieves three-dimensional cushioning with a large cushioning stroke, excellent cushioning effect, and a three-dimensional cushioning efficiency of >75%. It can adapt to environments throughout my country, and the manufacturing process is simple.

[0031] Compared with the prior art, the present invention has the following beneficial effects: By combining specific phenyl silicone rubber formulations with a stepped vulcanization process, the vibration damper exhibits a frequency drift of ≤15% and a damping efficiency >75% within an operating temperature range of -40℃ to 50℃. The rubber composition of this invention contains no external damping agents, avoiding problems such as poor compatibility, performance degradation, or complex processes caused by adding small-molecule or polar damping agents. The optimized crosslinking structure and compounding strategy endow the vibration damper with excellent mechanical properties, achieving a tensile strength of over 8MPa, enabling it to withstand large loads and impacts. The vibration damper has a simple structure and low manufacturing cost. By changing the structure of the central hole, a buffer stroke can be designed to meet the needs of equipment operating under different conditions. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the mold used in the co-vulcanization molding process in Example 1; Figure 2 This is a schematic diagram of the structure of the shock absorber described in Example 1. In the figure, 1 and 3 are metal frames, and 2 is a rubber composition. Figure 3 This is a schematic diagram of the metal frame of the shock absorber described in Example 1; Figure 4 This is a schematic diagram of the shock absorber rubber composition described in Example 1; Figure 5 This is a schematic diagram of the vibration damper described in Example 3. Detailed Implementation

[0033] The present invention will be further illustrated below with reference to embodiments, which will enable those skilled in the art to have a more comprehensive understanding of the present invention, but will not limit the present invention in any way; all materials used in the following embodiments were purchased directly from the market, and the compounded phenyl silicone rubber raw rubber was purchased from Zhonglan Chenguang Chemical Research and Design Institute Co., Ltd., with the grades CGGX-120-15, CGGX-120-25 and CGGX-120-35, wherein the phenyl content of CGGX-120-15 is 15%; the phenyl content of CGGX-120-25 is 25% and the vinyl content is 0.1%; the phenyl content of CGGX-120-35 is 35% and the vinyl content is 0.1%.

[0034] Example 1 A silicone rubber composition and a vibration damper prepared therefrom, wherein the main components of the rubber composition are, by weight: 1) 100 parts of compounded phenyl silicone rubber raw rubber (composed of 50 parts of CGGX-120-15, 25 parts of CGGX-120-25 and 25 parts of CGGX-120-35); 2) 50 parts of fumed silica TS-530 (specific surface area 225m² / g); 3) 0.9 parts of bis(2,5)sulfurizing agent; 4) 0.2 parts of TAIC vulcanizing agent.

[0035] The manufacturing process of the vibration damper is as follows: 1) Ingredient mixing: Add 100 parts of compound phenyl silicone rubber raw rubber to a kneader, then add 50 parts of reinforcing agent in multiple batches, mix evenly to obtain a compound, cut into sheets of about 5mm, and heat treat at 150℃ for 2 hours. 2) Vulcanization and resting: Add 2 parts of bis(2,5) vulcanizing agent and 0.2 parts of TAIC crosslinking agent to the compound in the open mill, pass through a thin mill and mix evenly, then sheet and let stand at room temperature for 12 hours. 3) Metal skeleton treatment: Two square steel plates, each 100×100mm in length and width, are used as the metal skeleton. They are sandblasted and degreased: A small sandblasting machine is used with 60-mesh corundum abrasive to sandblast the bonding surface, so that the surface is uniformly matte, without mirror reflection, and has a slightly frosted feel. Degreasing is performed within 4 hours. The surface is cleaned and dried using conventional metal cleaning agents and ultrasonic treatment. The adhesive is then applied to the side of the steel plate corresponding to the adhesive material by brushing. The adhesive used in this embodiment is Chemlok 8116-1, and the coating thickness is 16μm. After coating, the surface is allowed to air dry for 60 minutes.

[0036] 4) Co-vulcanization molding: First, place a square steel plate that has been treated in step 3) with the adhesive facing upwards. Figure 1 In the mold shown, the rubber material obtained in step 2) is placed into the mold, and finally the second square steel plate processed in step 3) is placed on top of the rubber material with the adhesive facing downward. The mold is then subjected to pressure vulcanization at a vulcanization temperature of 160℃, a vulcanization time of 30min, and a vulcanization pressure of 10MPa to produce the shock absorber. 5) Stepped post-vulcanization: The vibration damper obtained in step 4) is subjected to stepped temperature vulcanization, which includes: holding at 160°C for 1 hour, then raising to 180°C and holding for 1 hour, and finally raising to 200°C and holding for 2 hours to obtain the final product vibration damper.

[0037] The final vibration damper structure obtained in this embodiment is as follows: Figure 2 As shown; the metal frame is a square plate with dimensions of 100×100mm and a thickness of 8mm, made of 45 steel; the plate has 6 threaded connection holes (symmetrically distributed on both sides) and 5 stress relief ports (at the center), as shown. Figure 3As shown; because rubber is an incompressible material, the stiffness of the vibration damper increases dramatically under extreme compression. Therefore, five stress relief ports are opened on the frame. Under certain special circumstances, if the vibration damper exceeds its damping stroke, the rubber can overflow from the stress relief ports, preventing excessive force rise and damage to the controlled equipment. The rubber composition is 30mm thick, with a rounded square hole in the center. The opening area is 23% of the side area of ​​the rubber block. Figure 4 As shown.

[0038] Performance testing: Properties of the rubber composition: Damping performance (GJB 981A-2021): Tested using DMA, the test conditions are tensile mode, static strain 10%, dynamic strain 2.5%, 5Hz, 3k / min, temperature scan from -80℃ to 100℃. Test results: Within the temperature range of -40℃ to 50℃, tanδ is greater than 0.2, and the modulus change rate is 6.6 times; Mechanical properties (GB / T528–2009): tensile strength 8.9MPa, elongation at break 386%.

[0039] Performance of silicone rubber vibration dampers: Impact performance test: (refer to GJB150.16A, GJB150.18A), half sine wave, peak acceleration not less than 500g, pulse width 2ms, 200 impacts, record the impact damping rate, perform frequency sweep test before and after impact, and calculate frequency drift; Frequency sweep tests were conducted at -40℃, room temperature (10-35℃), and 50℃ respectively. The sweep conditions were 2-2000Hz, 0.2g, and 1Oct / min. The first-order resonant frequencies of the vibration damper at -40℃ and 50℃ were compared with those at room temperature (10-35℃), and the frequency drift was calculated. The test results are as follows: Impact performance: The shock absorption rate of the vibration damper is 81.4%-89.1%, and the frequency drift before and after 200 impact tests is about 2%; the frequency drift at -40℃ is 9.16%, and the frequency drift at 50℃ is -12.34%, both less than 15%.

[0040] Example 2 is similar to Example 1, except that the compounded phenyl silicone rubber raw rubber is composed of 54 parts of CGGX-120-15, 23 parts of CGGX-120-25 and 23 parts of CGGX-120-35; the amount of reinforcing agent in the silicone rubber damper rubber composition is changed to 40 parts, the vulcanizing agent is changed to dicumyl peroxide (DCP), and the stepped heating process is as follows: hold at 150°C for 2 hours, then raise to 170°C and hold for 2 hours, and finally raise to 190°C and hold for 2 hours. Other components and preparation methods are the same as in Example 1.

[0041] Properties of the rubber composition: Damping performance: tanδ is greater than 0.2 in the range of -40℃ to 50℃, and the modulus change rate is 7.2 times; Mechanical properties: tensile strength 9.2MPa, elongation at break 406%.

[0042] Performance of silicone rubber vibration dampers: Impact performance test: The shock absorber has an impact damping rate of 78%-82%.

[0043] Example 3 is similar to Example 1, except that the metal frame is made of titanium alloy plate, a square plate with sides of 75mm and a thickness of 5mm; the damper rubber composition is 44mm thick, and the central opening structure is honeycomb-shaped. Figure 5 As shown.

[0044] The vibration damper with this structure is lighter. After adopting the honeycomb shape, the equivalent stiffness of the vibration damper is reduced, the buffer stroke is increased, and the energy absorption efficiency is improved. According to the test, the vibration damper has a vibration reduction rate of 85.4%-92.1%, and the frequency drift is about 1.5% after 200 impact tests, and the frequency drift at high and low temperatures is <15%.

[0045] The comparative example uses a scheme similar to that of Example 1, except that the main components of the rubber composition by weight are: 100 parts of compounded phenyl silicone rubber raw rubber (compounded from 50 parts of CGGX-120-15 (phenyl content 15%) and 50 parts of CGGX-120-25 (phenyl content 25%)); the remaining parts are exactly the same.

[0046] Properties of the rubber composition: The damping performance is within the range of -40℃ to 50℃, with tanδ greater than 0.15 and a modulus change rate of 7.6 times. Mechanical properties (GB / T528–2009): Tensile strength 10.1 MPa, elongation at break 414%.

[0047] Performance of silicone rubber vibration dampers: Impact performance test: The shock absorber's impact damping rate is 71.1%-82.4%, failing to meet the 75% requirement in all three directions, thus failing to meet the vibration reduction requirements of the controlled equipment. This is because the rubber composition made from only two types of raw rubber, CGGX-120-15 and CGGX-120-25, has low damping performance, resulting in insufficient damping rate of the shock absorber.

[0048] In practical applications, the technical solution of the present invention can optimize the structure of the vibration damper for other impact conditions or size and weight constraints. By changing the number, shape and distribution of the central holes, the stiffness and energy absorption capacity of the vibration damper can be changed, so that it can be applied to different equipment. The vibration damper of the present invention can be mainly used for buffering and vibration reduction of equipment such as inertial navigation components in artillery and artillery-borne instruments and equipment under large impact environments, which can effectively protect the stable operation of the equipment.

[0049] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered as within the scope of this specification. The description of the above embodiments can be used to help understand the principles and methods of the present invention. However, the above embodiments are not unique and should not be construed as limiting the present invention.

Claims

1. A silicone rubber composition, characterized in that: It is prepared from raw materials comprising the following parts by weight: The compound consists of 100 parts of phenyl silicone rubber raw rubber, 30-60 parts of reinforcing agent, 0.2-1.5 parts of vulcanizing agent, and 0.1-0.5 parts by weight of co-crosslinking agent; The compounded phenyl silicone rubber raw rubber is composed of three different specifications of methyl phenyl vinyl silicone rubber raw rubber, which are compounded by CGGX-120-15, CGGX-120-25 and CGGX-120-35 in a mass ratio of (1.8-2.2):(0.9-1.1):(0.9-1.1).

2. The silicone rubber composition according to claim 1, characterized in that, Based on molar percentage, the phenyl content of CGGX-120-15 is 10-19%; the phenyl content of CGGX-120-25 is 19%-29% and the vinyl content is 0.1%-0.2%; and the phenyl content of CGGX-120-35 is 29%-39% and the vinyl content is 0.1%-0.2%.

3. The silicone rubber composition according to claim 1 or 2, characterized in that, Based on molar percentage, the phenyl content of CGGX-120-15 is 15%; the phenyl content of CGGX-120-25 is 25% and the vinyl content is 0.1%; and the phenyl content of CGGX-120-35 is 35% and the vinyl content is 0.1%.

4. The silicone rubber composition according to claim 1, characterized in that, The CGGX-120-15, CGGX-120-25 and CGGX-120-35 are compounded in a mass ratio of 2:1:

1.

5. The silicone rubber composition according to claim 1, characterized in that, The reinforcing agent is one or more of fumed silica, precipitated silica, silica powder, and diatomaceous earth, and its weight is 50 parts.

6. The silicone rubber composition according to claim 1, characterized in that, The vulcanizing agent is a peroxide vulcanizing agent, selected from one or more of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and dicumyl peroxide; the co-crosslinking agent is a peroxide vulcanizing agent, selected from one or more of triallyl isocyanurate, zinc dimethacrylate, and pentaerythritol tetraacrylate.

7. A vibration damper prepared using the silicone rubber composition of claim 1, characterized in that: The vibration damper is a sandwich structure of metal skeleton / rubber composite vibration damper, wherein the two sides are metal skeletons and the middle sandwich part is the aforementioned silicone rubber composition.

8. The vibration damper according to claim 7, characterized in that: The metal frame is square or rectangular in shape, made of steel, aluminum alloy or titanium alloy, with a side length or width and height of 50-100mm and a thickness of 5-8mm; the rubber composition is prepared as a square damping block with a central opening; the thickness of the damping block is 30-44mm, and the central opening can be a rounded square, square, rhomboid, hexagonal or honeycomb type; the metal frame and the rubber composition are bonded together with an adhesive.

9. The method for preparing the vibration damper according to claim 7, characterized in that: Includes the following steps: (1) Mixing and compounding: Mix the compounded phenyl silicone rubber raw rubber with the reinforcing agent evenly to obtain the compounded rubber. After cutting it into sheets of about 4-6 mm, heat-treat it at 150℃±2℃ for 1-2 hours. (2) Vulcanization and resting: Add vulcanizing agent and crosslinking agent to the compound, mix evenly, and sheet out in thin strips. Let it rest at room temperature for 12-36 hours. (3) Co-vulcanization molding: The rubber material obtained in step (2) and the metal skeleton after sandblasting, degreasing and applying adhesive are co-vulcanized under pressure in a well-designed mold. The adhesive can be applied by brushing or spraying. The vulcanization temperature is 160-170℃, the vulcanization pressure is 9-11MPa, and the vulcanization time is 30-45min. After vulcanization, a phenyl silicone rubber vibration damper is obtained. The mold is designed according to the shape of the final vibration damper. (4) Stepped post-vulcanization: The rubber shock absorber obtained in step (3) is subjected to stepped temperature rise and vulcanization. The stepped temperature rise and vulcanization includes: holding at 150-170℃ for 1-2 hours, then raising to 170-190℃ and holding for 1-2 hours, and finally raising to 190-210℃ and holding for 2-3 hours.

10. The method for preparing the vibration damper according to claim 9, characterized in that: The adhesive used is any one of Chemlok 8116-1, Chemlok 608, Cilbond 36, or Thinkbond236, and the coating thickness is controlled to be 7.6-17.8 μm.

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