Organosilicon damping material containing semi-free chain and preparation method thereof

Abstract

The invention provides an organosilicon damping material containing a semi-free chain and a preparation method thereof, and relates to the technical field of damping materials. An organosilicon damping material containing a semi-free chain comprises a matrix forming a three-dimensional network and a polymer fluid dispersed in the matrix network through chemical bonding, the components comprise, by weight, 20%-90% of the matrix and 10%-80% of the polymer fluid, the matrix is cross-linked siloxane, and the polymer fluid is silicone oil; the preparation method comprises the following steps: blending and curing cross-linked siloxane and silicone oil, and then irradiating and cross-linking under gamma rays. According to the damping material, polymer fluid is grafted and suspended on a matrix through chemical bonds, so that a fluid free chain forms a semi-free chain, and precipitation is prevented. The damping material has movement of chain segments and slippage of fluid molecular chains, and high damping and wide temperature range are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of damping materials, and in particular, to a silicone damping material containing semi-free chains and a preparation method thereof. Background Art

[0002] A damping material is a material that converts solid mechanical vibration energy into heat energy and dissipates it. It is mainly used for vibration and noise control. According to the type of matrix, it can be divided into two categories: metal-based damping materials and non-metal-based damping materials. Polymer damping materials are commonly used non-metal-based damping materials.

[0003] The most unique property of polymer damping materials is viscoelasticity. Among them, viscosity is a characteristic that dissipates energy and makes it difficult for the material to return to its initial state, and it is irreversible. When a polymer material is in the glass transition region (Tg), the internal molecular chain segments, groups, etc. move, and large internal friction occurs between them. This internal friction will consume the work done by the outside on the material, thereby achieving the purpose of vibration reduction and noise reduction. However, for a polymer material composed of a single component, its glass transition peak is often very narrow, and the entire region is only about 20 - 30 °C. This means that the material has high temperature sensitivity and a narrow damping temperature range, that is, the working temperature range for vibration reduction and noise reduction is limited.

[0004] Patent CN111925482A discloses a polymer fluid gel material, which includes 10 - 80 parts of polymer fluid, 0.1 - 10 parts of crosslinking agent, 0.5 - 10 parts of initiator, and 20 - 90 parts of polymer monomer. Its mechanism is as follows: 1. The segmental motion in the glass transition region normally exists, and the relaxation time of the segments is short, occurring at low temperature and high frequency; 2. The polymer fluid additionally provides the viscous flow motion of molecular chains, and the relaxation time is long, and the damping occurs at high temperature and low frequency; Therefore, the polymer fluid gel can achieve damping in a wide temperature range and a wide frequency band. However, there are the following problems: 1. The polymer fluid with a large steric hindrance cannot be constrained in the crosslinked network, and when the matrix crosslinks and cures, the large steric hindrance fluid will be excluded; 2. The polymer fluid is constrained in the matrix network through molecular chain entanglement, which is a free chain, not the action of fixed crosslinking points, and is prone to migration and precipitation, resulting in unstable performance. Summary of the Invention

[0005] The purpose of the present invention is to provide a silicone damping material containing semi-free chains, which has the characteristics of high damping and a wide temperature range, and can meet the vibration reduction and noise reduction requirements in different regions and different environments.

[0006] Another purpose of the present invention is to provide a preparation method of a silicone damping material containing semi-free chains. By irradiating, the free chains of the fluid are formed into semi-free chains, so that the fluid with a large steric hindrance can be stably constrained in the crosslinked network, preventing precipitation, maintaining the damping effect, and enhancing the mechanical properties.

[0007] The present invention is achieved through the following technical solutions:

[0008] An organosilicon damping material containing semi-free chains, comprising a matrix forming a three-dimensional network and a polymer fluid dispersed in the matrix network through chemical bonding. By weight percentage, the matrix is 20%-90%, and the polymer fluid is 10%-80%; the matrix is a cross-linked siloxane, and the polymer fluid is a silicone oil.

[0009] In the present invention, the cross-linked siloxane forms a matrix with a network structure. The silicone oil with a small steric hindrance (viscosity) is locked in the matrix by mechanical action, and the silicone oil with a large steric hindrance (viscosity) is grafted and suspended on the matrix through chemical bonding, thereby transforming the free fluid molecular chains into semi-free molecular chains, reducing the precipitation phenomenon of the polymer fluid, promoting the stable confinement of the polymer fluid with a large steric hindrance in the network structure of the matrix, improving the damping stability of the material, and enhancing the mechanical properties of the material. At the same time, the semi-free molecular chains of the polymer fluid still maintain the viscous flow characteristics, ensuring the damping effect.

[0010] In the present invention, establishing a chemical bond between the polymer fluid and the matrix can endow the damping material with excellent flexibility, so that the intermolecular force between silicone oil molecules is lower than that of hydrocarbons, so that the damping material has a higher molecular weight when maintaining the viscous flow characteristics, the molecular chains are longer, the relaxation time distribution is wider, increasing the diversity of its motion units, broadening its damping relaxation spectrum, and making the damping material exhibit an excellent damping temperature range. The obtained damping material has both two relaxation types. One is the movement of the chain segments, with a short relaxation time and occurring at low temperature; the other is the slippage of the fluid molecular chains, with a long relaxation time and occurring at high temperature. The two relaxation types synergistically enhance the interfacial friction and increase the damping value of the material, so that the damping material reaches a wider damping temperature range and has an excellent damping effect.

[0011] In the present invention, by controlling the amounts of the matrix and the polymer fluid, the polymer fluid can be fully and stably confined in the network structure of the matrix. When the silicone oil is in excess, the excess polymer fluid cannot establish a chemical bond with the matrix network, and the fluid molecular chains are free chains, which are easy to migrate and precipitate, affecting the damping effect of the material; when the polymer fluid is too little, the movement of the chain segments and the slippage of the fluid molecular chains are reduced, and the interfacial friction is small, affecting the damping temperature range of the material. Preferably, by weight percentage, the matrix is 20%-50%, and the polymer fluid is 50%-80%.

[0012] Further, the viscosity of the silicone oil is 500,000-2,000,000 cs, and the molecular weight is 5,000-300,000.

[0013] Further, the silicone oil is dimethyl silicone oil, diethyl silicone oil or methylphenyl silicone oil.

[0014] Optimizing the component selection of silicone oil, as well as its viscosity and molecular weight, is beneficial to obtaining a damping material with appropriate viscosity. Preferably, the viscosity of the silicone oil is 1 million cs, and the damping effect of the damping material is the best at this viscosity.

[0015] Furthermore, the crosslinked siloxane is obtained by curing and crosslinking a polysiloxane with a crosslinking agent. Preferably, the viscosity of the polysiloxane is 1000 - 10000 cs. Controlling the viscosity of the polysiloxane is beneficial to broadening the damping temperature range of the damping material and improving its damping performance. Preferably, the curing and crosslinking conditions are: temperature 25 - 150 °C, time 10 min - 3 d.

[0016] Furthermore, the polysiloxane is a vinyl-terminated polysiloxane, and the crosslinking agent is a hydrogen-containing silicone oil. The molar ratio of the vinyl group of the vinyl-terminated polysiloxane to the silicon hydride group of the hydrogen-containing silicone oil is 1:0.8 - 2. Selecting a vinyl-terminated polysiloxane and a hydrogen-containing silicone oil for hydrosilylation reaction, and using the reaction of silicon-hydrogen bond and carbon-carbon double bond to obtain a crosslinked siloxane as the matrix material. Optimizing the molar ratio of the vinyl group of the vinyl-terminated polysiloxane to the silicon hydride group of the hydrogen-containing silicone oil is beneficial to obtaining a matrix material with more excellent quality and assisting in improving the comprehensive performance of the damping material.

[0017] Furthermore, the polysiloxane is a hydroxyl-terminated polysiloxane, and the crosslinking agent is boric acid, tetraethoxysilane or methyltrimethoxysilane. The molar ratio of the hydroxyl group of the hydroxyl-terminated polysiloxane to the boron hydroxyl group of boric acid, the molar ratio of the hydroxyl group of the hydroxyl-terminated polysiloxane to the ethoxy group of tetraethoxysilane, and the molar ratio of the hydroxyl group of the hydroxyl-terminated polysiloxane to the methoxy group of methyltrimethoxysilane are all 1:0.5 - 1.8. Selecting a hydroxyl-terminated polysiloxane and obtaining a crosslinked siloxane through the condensation reaction of the hydroxyl group with the boron hydroxyl group, ethoxy group or methoxy group respectively. By controlling the molar ratio of the active groups, the crosslinking density can be increased to form a uniform network structure. Avoiding the residual unreacted crosslinking agent caused by excessive crosslinking agent leading to phase separation, or forming a local over-crosslinked region resulting in material embrittlement. Avoiding the existence of uncrosslinked polymer segments when the crosslinking agent is insufficient, which reduces the mechanical strength of the material, or forming a loose network resulting in material swelling.

[0018] A preparation method of an organosilicon damping material containing semi-free chains includes the following steps: blending and curing each component, and then irradiating and crosslinking under γ rays.

[0019] As Figure 1As shown in the figure, during the blending and curing process, the crosslinkable silicone forms a crosslinked network through crosslinking, and the silicone oil is locked in the crosslinked network through mechanical action. After irradiation, the methyl groups contained in the polysiloxane form free radicals, and the methyl groups contained in the silicone oil also form free radicals. The two react with each other, thereby establishing chemical bonds between the polymer fluid and the matrix, enabling the polymer fluid to graft and hang on the matrix, forming semi-free chains. This not only maintains the viscous flow characteristics of the polymer fluid but also undergoes a chemical reaction with the matrix. By connecting through chemical bonds, the bleeding phenomenon is reduced, and the damping stability is excellent, and the mechanical properties of the damping material are excellent.

[0020] Furthermore, the curing temperature is 80 - 150 °C, and the curing time is 1 - 3 h.

[0021] Furthermore, the irradiation time is 1 - 4 d, the irradiation dose is 10 - 100 kGy, and the dose rate is 5 - 20 kGy / min. Strictly controlling the irradiation dose is necessary to enable the damping material to contain semi-free chains. If the irradiation dose is too low, semi-free chains cannot be formed, and the fluid in the damping material is basically in a free-chain state and is not restricted. The fluid in the damping material is prone to bleeding, and the mechanical properties are poor. If the irradiation dose is too high, the chains are completely restricted, and semi-free chains cannot be formed either, which affects the damping performance of the damping material. Preferably, the irradiation time is greater than 1.5 d, the irradiation dose is 20 kGy, and the dose rate is 10 kGy / min.

[0022] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0023] In the present invention, the crosslinkable silicone forms a matrix with a network structure. The silicone oil with a small steric hindrance (viscosity) is locked in the matrix through mechanical action, and the silicone oil with a large steric hindrance (viscosity) is grafted and hangs on the matrix through chemical bond action, thereby transforming the free fluid molecular chains into semi-free molecular chains, reducing the bleeding phenomenon of the polymer fluid, promoting the stable confinement of the polymer fluid with a large steric hindrance in the network structure of the matrix, improving the damping stability of the material, and enhancing the mechanical properties of the material. At the same time, the semi-free molecular chains of the polymer fluid still maintain the viscous flow characteristics, ensuring the damping effect.

[0024] Establishing chemical bonds between the polymer fluid and the matrix can endow the damping material with excellent flexibility, making the intermolecular force of the silicone oil lower than that of hydrocarbons, enabling the damping material to have a higher molecular weight, longer molecular chains, and a wider relaxation time distribution while maintaining the viscous flow characteristics, increasing the diversity of its motion units, broadening its damping relaxation spectrum, and making the damping material exhibit an excellent damping temperature range. The obtained damping material has both of the two relaxation types. One is the movement of the chain segments, with a short relaxation time and occurring at low temperatures; the other is the slip of the fluid molecular chains, with a long relaxation time and occurring at high temperatures, thereby enabling the damping material to achieve a wider damping temperature range and excellent damping effect. Description of the Drawings

[0025] Figure 1 It is a process schematic diagram for manufacturing damping materials provided by the embodiments of the present invention, where PS is polysiloxane;

[0026] Figure 2 It is the temperature spectrum diagram of the damping material obtained in Example 7;

[0027] Figure 3 It is the frequency band diagram of the damping material obtained in Example 7;

[0028] Figure 4 It is the graph of the change in damping performance of the damping materials obtained in Examples 7 - 10 and Comparative Examples 1 - 2;

[0029] Figure 5 It is the graph of the change in damping performance of the damping materials obtained in Example 7, Examples 11 - 13, and Comparative Example 1;

[0030] Figure 6 It is the mechanical property diagram of the damping materials of Example 7 and Comparative Example 3. Specific Embodiments

[0031] The present invention will be further described below in conjunction with specific embodiments, but the embodiments do not impose any form of limitation on the present invention. Unless otherwise specified, the raw material reagents used in the embodiments of the present invention are conventionally purchased raw material reagents.

[0032] Example 1

[0033] A preparation method of an organosilicon damping material containing semi - free chains, comprising the following steps:

[0034] Preparation of cross - linked siloxane: Mix vinyl - terminated polysiloxane and hydrogen - containing silicone oil, and cure and cross - link at 25°C for 2 days. The viscosity of the vinyl - terminated polysiloxane is 10000 cs, and the molar ratio of the vinyl group of the vinyl - terminated polysiloxane to the silicon - hydrogen group of the hydrogen - containing silicone oil is 1:2.

[0035] Preparation of the damping material: Mix 90 g of cross - linked siloxane and 10 g of dimethyl silicone oil and stir for 1 h, pre - cure at 80°C for 1 h, and then carry out an irradiation cross - linking reaction for 1 day under γ - rays. The irradiation dose is 10 kgy, and the dose rate is 5 kgy / min. The viscosity of the dimethyl silicone oil is 500,000 cs, and the molecular weight is 5000.

[0036] Example 2

[0037] A preparation method of an organosilicon damping material containing semi - free chains, comprising the following steps:

[0038] Preparation of crosslinked silicone: Mix the hydroxyl-terminated polysiloxane and boric acid, and cure and crosslink at 150 °C for 3 h. The viscosity of the hydroxyl-terminated polysiloxane is 1000 cs, and the molar ratio of the hydroxyl group of the hydroxyl-terminated polysiloxane to the borohydric hydroxyl group of boric acid is 1:0.5.

[0039] Preparation of damping material: Mix 50 g of crosslinked silicone and 50 g of diethyl silicone oil and stir for 0.5 h, pre-cure at 150 °C for 1 h, and then carry out an irradiation crosslinking reaction under γ-rays for 4 d. The irradiation dose is 50 kGy and the dose rate is 20 kGy / min. The viscosity of dimethyl silicone oil is 2 million cs and the molecular weight is 300,000.

[0040] Example 3

[0041] A preparation method of an organosilicon damping material containing semi-free chains, comprising the following steps:

[0042] Preparation of crosslinked silicone: Mix the hydroxyl-terminated polysiloxane and tetraethoxysilane, and cure and crosslink at 100 °C for 3 d. The viscosity of the hydroxyl-terminated polysiloxane is 7000 cs, and the molar ratio of the hydroxyl group of the hydroxyl-terminated polysiloxane to the ethoxy group of tetraethoxysilane is 1:1.

[0043] Preparation of damping material: Mix 70 g of crosslinked silicone and 30 g of methylphenyl silicone oil and stir for 0.5 h, pre-cure at 90 °C for 2 h, and then carry out an irradiation crosslinking reaction under γ-rays for 2 d. The irradiation dose is 80 kGy and the dose rate is 15 kGy / min. The viscosity of dimethyl silicone oil is 1.5 million cs and the molecular weight is 100,000.

[0044] Example 4

[0045] In this example, the molar ratio of the vinyl group of the vinyl-terminated polysiloxane in the crosslinked silicone to the silicon hydride group of the hydrogen-containing silicone oil is 1:1.2, and it is obtained by curing at 150 °C for 10 min. The viscosity of the vinyl-terminated polysiloxane is 8000 cs. The rest is the same as in Example 1.

[0046] Example 5

[0047] In this example, the molar ratio of the hydroxyl group of the hydroxyl-terminated polysiloxane in the crosslinked silicone to the borohydric hydroxyl group of boric acid is 1:1.8, and it is obtained by curing at 100 °C for 10 h. The viscosity of the hydroxyl-terminated polysiloxane is 5000 cs. The rest is the same as in Example 2.

[0048] Example 6

[0049] In this example, the molar ratio of the hydroxyl groups of the hydroxyl-terminated polysiloxane in the crosslinked siloxane to the methoxy groups of methyltrimethoxysilane is 1:1.5, and it is obtained by curing at a temperature of 150 °C for 3 days. The viscosity of the hydroxyl-terminated polysiloxane is 8000 cs. The rest is the same as in Example 2.

[0050] Example 7

[0051] A method for preparing an organosilicon damping material containing semi-free chains includes the following steps:

[0052] Preparation of the damping material: Mix 20 g of crosslinked siloxane and 80 g of methylphenyl silicone oil and stir for 0.5 h, pre-cure at 100 °C for 2 h, and then carry out an irradiation crosslinking reaction under γ-rays for 2 days. The irradiation dose is 20 kGy and the dose rate is 10 kGy / min. The viscosity of the methylphenyl silicone oil is 1 million cs and the molecular weight is 100,000. The crosslinked siloxane in this example is prepared as in Example 6.

[0053] Example 8

[0054] The difference from Example 7 is that the viscosity of the methylphenyl silicone oil is 500,000 cs, and the rest is the same as in Example 7.

[0055] Example 9

[0056] The difference from Example 7 is that the viscosity of the methylphenyl silicone oil is 1.5 million cs, and the rest is the same as in Example 7.

[0057] Example 10

[0058] The difference from Example 7 is that the viscosity of the methylphenyl silicone oil is 2 million cs, and the rest is the same as in Example 7.

[0059] Example 11

[0060] The difference from Example 7 is that the methylphenyl silicone oil is 50 g and the crosslinked siloxane is 50 g, and the rest is the same as in Example 7.

[0061] Example 12

[0062] The difference from Example 7 is that the methylphenyl silicone oil is 60 g and the crosslinked siloxane is 40 g, and the rest is the same as in Example 7.

[0063] Example 13

[0064] The difference from Example 7 is that the methylphenyl silicone oil is 70 g and the crosslinked siloxane is 30 g, and the rest is the same as in Example 7.

[0065] Comparative Example 1

[0066] The difference from Example 7 is that the damping material is 100 g of the crosslinked silicone obtained in Example 6 and does not contain methylphenyl silicone oil. The rest are the same as in Example 7.

[0067] Comparative Example 2

[0068] The difference from Example 7 is that the viscosity of the methylphenyl silicone oil is 100,000 cs and the molecular weight is 4,000; the rest are the same as in Example 7.

[0069] Comparative Example 3

[0070] The difference from Example 7 is that the damping material is obtained by curing methylphenyl silicone oil and crosslinked silicone at 100 °C for 1 h without irradiation; the rest are the same as in Example 7.

[0071] Comparative Example 4

[0072] The difference from Example 7 is that the crosslinking reaction is carried out for 7 d under the irradiation of γ-rays and the irradiation dose is 20 kGy; the rest are the same as in Example 7.

[0073] Comparative Example 5

[0074] The difference from Example 7 is that the crosslinking reaction is carried out for 2 d under the irradiation of γ-rays and the irradiation dose is 150 kGy; the rest are the same as in Example 7.

[0075] Comparative Example 6

[0076] The difference from Example 7 is that the crosslinked silicone is replaced with vinyl-terminated polysiloxane; the rest are the same as in Example 7.

[0077] Comparative Example 7

[0078] The difference from Example 7 is that the methylphenyl silicone oil is 90 g and the crosslinked silicone is 10 g; the rest are the same as in Example 7.

[0079] Comparative Example 8

[0080] The difference from Example 7 is that the methylphenyl silicone oil is 5 g and the crosslinked silicone is 95 g; the rest are the same as in Example 7.

[0081] Performance detection test

[0082] The samples obtained in Examples 1-13 and Comparative Examples 1-8 were subjected to damping tests. There were 10 specimens in each group. The average loss factor values of each specimen at -55 °C, 25 °C, 105 °C and 200 °C were recorded, and the temperature corresponding to the peak value of the loss factor was recorded. The results are recorded in Table 1.

[0083] Damping test: The test temperature range is from -55°C to 200°C, the heating rate is 3°C / min, the frequency is selected as 1 Hz, and the oscillating strain is set to 0.5%.

[0084] Figure 2 and Figure 3 are the temperature spectrum diagram and frequency band diagram of the damping material obtained in Example 7.

[0085] Figure 4 is the diagram of the change in damping performance of the damping materials obtained in Examples 7 - 10 and Comparative Examples 1 - 2, which characterizes the influence of silicone oil viscosity on damping performance.

[0086] Figure 5 is the diagram of the change in damping performance of the damping materials in Example 7, Examples 11 - 13, and Comparative Example 1, which characterizes the influence of the ratio of silicone oil to crosslinked siloxane on damping performance.

[0087] Figure 6 is the schematic diagram of the mechanical properties of the damping materials in Example 7 and Comparative Example 3. The mechanical properties test was carried out according to GB / T528 - 2009 "Test Method for Rubber Tensile Properties". The dynamic mechanical properties of the samples were characterized by a TA Q800 analyzer (USA) in shear mode.

[0088] Table 1

[0089]

[0090] From Examples 1 - 13 and in combination with Table 1, it can be seen that the damping materials prepared by the present invention have relatively high loss factor values from -55°C to 200°C, indicating that the above damping materials have a wide damping temperature range. Combining with Example 7 and Figure 2 and Figure 3 it can be seen that the damping material obtained in Example 7 has stable damping performance and excellent damping performance.

[0091] From Examples 7 - 10 and Comparative Examples 1 - 2 and in combination with Figure 4 it can be seen that, under the condition of the same raw material component ratio, the viscosity of silicone oil has a significant influence on damping performance. When the viscosity of silicone oil is between 500,000 - 2,000,000 cs, the damping materials obtained have excellent damping performance. In Comparative Example 1, there is no silicone oil, which can be regarded as the viscosity of silicone oil being 0. In the temperature range from -55°C to 200°C, the loss factor of Comparative Example 1 is below 0.2, without damping performance. In Comparative Example 2, the viscosity of silicone oil is only 100,000 cs. As the temperature rises, especially after 25°C, the loss factor drops rapidly and cannot maintain good damping performance in a wide temperature range.

[0092] From Example 7, Examples 11 - 13, and Comparative Example 1 and in combination with Figure 5It can be seen that in the same raw materials, the ratio between the raw materials also has an obvious influence on the damping material. When the mass of silicone oil is 80 g and the mass of crosslinked siloxane is 20 g, the damping material has the best damping performance, is least affected by temperature, and has the largest loss factor value.

[0093] Through Example 7 and Comparative Example 3 and in combination with Figure 6 It can be seen that the damping material obtained in Comparative Example 3 was not irradiated. The elongation at break of the damping material in Example 7 was increased by 3 times compared with Comparative Example 3. Thus, it can be seen that the mechanical properties of the damping material can be significantly improved through the radiation crosslinking reaction. At the same time, it can be seen from Table 1 that the damping material in Example 7 has a higher loss factor value from -55°C to 200°C. Thus, it can be seen that the damping performance of the damping material can be improved through the radiation crosslinking reaction.

[0094] Through Example 7, Comparative Example 4 and Comparative Example 5 and in combination with Table 1, it can be seen that the irradiation time in Comparative Example 4 was too long and the irradiation dose in Comparative Example 5 was too high, resulting in the damping material becoming hard, the fluid molecular chains being completely constrained, and unable to form semi-free chains, seriously affecting the damping performance of the damping material.

[0095] Through Example 7, Comparative Examples 6 - 7 and in combination with Table 1, it can be seen that the damping performance of the damping material obtained in Comparative Example 6, which uses unmodified vinyl-terminated polysiloxane as the matrix, is not good. In Comparative Example 7, the ratio of methylphenyl silicone oil to crosslinked siloxane is too high, and in Comparative Example 8, the ratio of methylphenyl silicone oil to crosslinked siloxane is too low, and the damping performance of the obtained damping materials is not good. Thus, it can be seen that an appropriate ratio of crosslinked siloxane and silicone oil can improve the damping performance of the damping material.

[0096] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A semi-free chain-containing organic silicon damping material, characterized in that: The invention comprises a matrix forming a three-dimensional network and a polymer fluid dispersed in the matrix network through chemical bonding, wherein the components are calculated by weight percentage, the matrix is ​​20%-90%, and the polymer fluid is 10%-80%. The matrix is ​​cross-linked siloxane, and the polymer fluid is silicone oil.

2. The semi-free chain-containing organic silicon damping material according to claim 1, characterized in that: The silicone oil has a viscosity of 500,000-2,000,000 cs and a molecular weight of 5,000-300,000.

3. The semi-free chain-containing organic silicon damping material according to claim 2, characterized in that: The silicone oil is dimethyl silicone oil, diethyl silicone oil or methylphenyl silicone oil.

4. The semi-free chain-containing organic silicon damping material according to claim 2 or 3, characterized in that: The cross-linked siloxane is obtained by curing and cross-linking polysiloxane with a cross-linking agent.

5. The semi-free chain-containing organic silicon damping material according to claim 4, characterized in that: The polysiloxane is a vinyl-terminated polysiloxane, the crosslinking agent is a hydrogen-containing silicone oil, and the molar ratio of the vinyl group of the vinyl-terminated polysiloxane to the silicon-hydrogen group of the hydrogen-containing silicone oil is 1:0.8-2.

6. The semi-free chain-containing organic silicon damping material according to claim 4, characterized in that: The polysiloxane is a hydroxyl-terminated polysiloxane, and the crosslinking agent is boric acid, tetraethoxysilane or methyltrimethoxysilane.

7. The semi-free chain-containing organic silicon damping material according to claim 6, characterized in that: The molar ratios of the hydroxyl group of the hydroxyl-terminated polysiloxane and the borohydroxyl group of the boric acid, the hydroxyl group of the hydroxyl-terminated polysiloxane and the ethoxy group of the tetraethoxysilane, and the hydroxyl group of the hydroxyl-terminated polysiloxane and the methoxy group of the methyltrimethoxysilane are all 1:0.5-1.

8.

8. The method for preparing the semi-free chain-containing organic silicon damping material according to any one of claims 1 to 7, characterized in that: The following steps are involved: The components are blended and cured, and then cross-linked under γ-ray irradiation.

9. The method for preparing the semi-free chain-containing organic silicon damping material according to claim 8, characterized in that: The curing temperature is 80-150°C and the curing time is 1-3h.

10. The method for preparing the semi-free chain-containing organic silicon damping material according to claim 9, characterized in that: The irradiation time is 1-4 days, the irradiation dose is 10-100 kgy, and the dose rate is 5-20 kgy / min.

Images