A phenyl silicone rubber damping material, its preparation method and application

Abstract

The present invention belongs to the technical field of silicone damping materials, and particularly relates to a phenyl silicone rubber damping material, a preparation method thereof, and an application. For the phenyl silicone rubber damping material, the temperature range with tanδ > 0.3 is 26°C to 36°C, the starting temperature of the temperature range with tanδ > 0.3 is -81°C to -80°C, the maximum tanδ is 0.56 to 1.1, and the tensile strength is 5.3 to 5.9 MPa. Benefiting from the good compatibility and dynamic bonds between the phenyl silicone rubber and the damping additive, the damping temperature range of the phenyl silicone rubber damping material of the present invention is broadened, the loss factor is increased, and it has excellent damping performance and mechanical properties.

Description

Technical Field

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

[0002] Disclosing the information of this background art section is only intended to enhance the overall understanding of the present invention, and is not necessarily regarded as an admission or an implication in any form that this information constitutes the prior art already known to those of ordinary skill in the art.

[0003] During the operation or movement of mechanical equipment, inevitable vibrations exist both macroscopically and microscopically, and with the improvement of the operating ability of mechanical equipment, the vibrations become more intense. Vibrations not only significantly affect the accuracy, reliability and stability of mechanical equipment, but also damage the precision components inside the mechanical equipment, shortening the service life of the mechanical equipment. Therefore, it is necessary to develop high-performance damping materials to effectively reduce the vibrations during the operation of mechanical equipment and avoid the adverse effects brought by vibrations.

[0004] The structure of silicone rubber composed of a -Si-O-Si- main chain and organic group side chains endows it with many excellent properties such as weather resistance, aging resistance, electrical insulation, ozone resistance, water repellency, flame retardancy, and physiological inertness, enabling it to be widely used in fields such as aerospace, weaponry, ships and vehicles, and electronic machinery. The excellent properties of silicone rubber make it expected to be used in damping materials. However, due to the strong flexibility of the silicone rubber molecular chain and the small internal friction of the chain segment movement, its loss factor (tanδ) is low and the temperature range of effective damping (tanδ>0.3) is narrow, making it difficult to meet the requirements of damping materials.

[0005] The main modification methods for improving the damping performance of silicone rubber include blending, copolymerization, constructing an interpenetrating network (IPN), and adding damping additives, etc. Among them, adding damping additives is the simplest and most efficient and is widely used. However, damping additives have defects such as unsatisfactory mechanical properties and weather resistance by themselves, which will lead to a decline in performance after being mixed with silicone rubber, poor compatibility with silicone rubber resulting in phase separation, and affecting the glass transition temperature of silicone rubber, etc., resulting in the inability to simultaneously meet the requirements of the mechanical properties, weather resistance and damping performance of the silicone rubber modified with damping additives, restricting the application fields of silicone rubber damping materials. Summary of the Invention

[0006] In order to solve the deficiencies of the prior art, the present invention provides a phenyl silicone rubber damping material, a preparation method thereof and an application thereof. Benefiting from the good compatibility and dynamic bonds between phenyl silicone rubber and damping additives, the damping temperature range of the phenyl silicone rubber damping material of the present invention is broadened, the loss factor is increased, and it has excellent damping performance and mechanical properties.

[0007] To achieve the above object, the present invention is implemented by the following technical solutions:

[0008] In a first aspect, the present invention provides a phenyl silicone rubber damping material, wherein the temperature range of tanδ > 0.2 of the phenyl silicone rubber damping material is 218°C to 334°C, the starting temperature of the temperature range of tanδ > 0.2 is -84°C to -81°C, the maximum tanδ is 0.56 to 1.1, and the tensile strength is 5.3 to 5.9 MPa.

[0009] Preferably, the temperature range of tanδ > 0.3 of the phenyl silicone rubber damping material is 26°C to 36°C, the starting temperature of the temperature range of tanδ > 0.3 is -81°C to -80°C, and the tanδ at 150°C is 0.19 to 0.29.

[0010] Preferably, the elongation at break of the phenyl silicone rubber damping material is 684% to 742%, and the hardness is 28 to 31.

[0011] Preferably, the phenyl silicone rubber damping material comprises phenyl silicone rubber and a damping additive, and the mass ratio of the phenyl silicone rubber to the damping additive is 1:(0.2 to 0.4). The damping additive is a polyborosiloxane containing aryl groups, the aryl concentration in the polyborosiloxane is 0.1 to 2 mol / kg, and the aryl groups include one or more of phenyl, biphenyl, naphthyl, and anthryl.

[0012] More preferably, it has a structure shown in Formula I, Formula II, Formula III, or Formula IV:

[0013] Formula I;

[0014] Formula II;

[0015] Formula III;

[0016] Formula IV;

[0017] In the formula, R3 is selected from one of phenyl, biphenyl, and anthryl, a is a positive integer selected from 1 to 5, b:a ≤ 50%, and the structural formula of A is as shown in Formula V:

[0018] Formula V;

[0019] In the formula, R1 and R2 are independently selected from one or a combination of several of methyl, phenyl, vinyl, and hydrogen atoms, m:n ≤ 30%, and m ≤ 100.

[0020] More preferably, the viscosity of the polyborosiloxane-based damping additive is 100 to 20000 mPa·s.

[0021] Further preferably, the number-average molecular weight of A is 1000 to 10000.

[0022] Further preferably, both R1 and R2 are methyl groups.

[0023] Further preferably, a is 1 or 2 and b is 1.

[0024] Further preferably, the weight-average molecular weight of the phenyl silicone rubber is 400,000 to 800,000, the phenyl content is 15% to 40%, and the vinyl content is 0.1% to 1%.

[0025] Further preferably, the phenyl silicone rubber damping material further comprises a reinforcing filler and a vulcanizing agent. The reinforcing filler comprises one or more of MQ resin and fumed silica, and the mass ratio of the phenyl silicone rubber to the reinforcing filler is 1:(0.4 to 0.6); the vulcanizing agent comprises vulcanizing agent bis(2,4), and the mass ratio of the phenyl silicone rubber to the vulcanizing agent is 1:(0.01 to 0.03).

[0026] In a second aspect, the present invention provides a method for preparing a phenyl silicone rubber damping material, comprising the following steps:

[0027] Mix the phenyl silicone rubber and the reinforcing filler evenly and then let stand, then add the vulcanizing agent and the damping additive and mix evenly, then carry out primary vulcanization, and finally carry out secondary vulcanization to obtain the phenyl silicone rubber damping material;

[0028] The mass ratio of the phenyl silicone rubber to the damping additive is 1:(0.2 to 0.4). The damping additive is a polyborosiloxane containing aryl groups, and the aryl group concentration in the polyborosiloxane is 0.1 to 2 mol / kg. The aryl groups include one or more of phenyl, biphenyl, naphthyl, and anthryl.

[0029] Preferably, the number-average molecular weight of the polyborosiloxane is 1000 to 20000, and the viscosity is 100 to 20000 mPa·s.

[0030] Preferably, the phenyl silicone rubber comprises monophenyl silicone rubber, the weight-average molecular weight of the phenyl silicone rubber is 400,000 to 800,000, the phenyl content is 15% to 40%, and the vinyl content is 0.1% to 1%.

[0031] Preferably, the polyborosiloxane is obtained by reacting a hydroxyl-terminated polysiloxane with an aryl boronic acid in a molar ratio of 1:(0.6 to 3). The hydroxyl-terminated polysiloxane includes hydroxyl-terminated dimethyl polysiloxane, and the aryl boronic acid includes one or more combinations of benzeneboronic acid, 1,4-benzenediboronic acid, 1,3-benzenediboronic acid, biphenyldiboronic acid, and anthracene-9,10-diboronic acid.

[0032] Further preferably, the number-average molecular weight of the hydroxyl-terminated polysiloxane is 1000 to 10,000, and the structural formula of the hydroxyl-terminated polysiloxane is as shown in Formula VI:

[0033] Formula VI.

[0034] Preferably, the reinforcing filler includes one or more of MQ resin and fumed silica, and the mass ratio of the phenyl silicone rubber to the reinforcing filler is 1:(0.4 - 0.6); the vulcanizing agent includes bis(2,4)-dichlorobenzoyl peroxide, and the mass ratio of the phenyl silicone rubber to the vulcanizing agent is 1:(0.01 - 0.03).

[0035] Preferably, the phenyl silicone rubber and the reinforcing filler are mixed evenly at 40°C to 60°C and then left standing at room temperature for 12 to 20 h, and then the vulcanizing agent and the damping additive are added and mixed evenly at 20°C to 40°C.

[0036] Preferably, the vulcanization temperature of the first-stage vulcanization is 80°C to 120°C, the vulcanization time is 5 to 15 min, and the vulcanization pressure is 5 to 15 MPa; the vulcanization temperature of the second-stage vulcanization is 160°C to 200°C, and the vulcanization time is 2 to 6 h.

[0037] In the third aspect, the present invention provides the application of the phenyl silicone rubber damping material as described in the first aspect and / or the phenyl silicone rubber damping material obtained by the preparation method as described in the second aspect in aerospace, weaponry, ships and vehicles, or electronic machinery.

[0038] The beneficial effects achieved by one or more of the above technical solutions of the present invention are as follows:

[0039] For the phenyl silicone rubber damping material of the present invention, the temperature range with tanδ > 0.3 is 26°C to 36°C, the starting temperature of the temperature range with tanδ > 0.3 is -81°C to -80°C, the maximum tanδ is 0.56 to 1.1, the temperature range with tanδ > 0.2 is 218°C to 334°C, and the tensile strength is 5.3 to 5.9 MPa. It has excellent damping performance and mechanical properties, is suitable for damping requirements at high and low temperatures, and broadens the application range of phenyl silicone rubber as a damping material.

[0040] In the phenyl silicone rubber damping material of the present invention, a polyborosiloxane containing aryl groups is used as a damping additive, which has good compatibility with the phenyl silicone rubber and avoids phase separation. The conjugate effect generated by the two improves energy dissipation, and boron-oxygen dynamic bonds can be formed, jointly improving the damping performance of the phenyl silicone rubber damping material. Moreover, the phenyl silicone rubber damping material has excellent mechanical properties and the glass transition temperature is not affected. Description of the Drawings

[0041] The accompanying drawings of the specification, which form a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0042] Figure 1 It is the dynamic mechanical curves of the phenyl silicone rubber damping materials in Examples 1 - 5 and Comparative Examples 1 - 2 of the present invention;

[0043] Figure 2 It is the damping mechanism of the phenyl silicone rubber damping material of the present invention. Detailed Embodiments

[0044] In order to enable those skilled in the art to more clearly understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in combination with specific examples and comparative examples.

[0045] Example 1

[0046] 50 g of hydroxyl - terminated dimethyl polysiloxane with a number - average molecular weight of 1000 (0.05 mol) was mixed with 100 ml of toluene. 6.1 g (0.05 mol) of phenylboronic acid was slowly added under stirring at room temperature. After stirring at room temperature for 30 min, the temperature was raised to 120°C. After stirring at 120°C for 10 h, the reaction system was cooled to room temperature, and the unreacted phenylboronic acid was filtered off. Then the solvent toluene was removed by rotary evaporation, and then it was placed in a vacuum oven and dried at 70°C for 24 h to obtain a damping additive with a number - average molecular weight of 1421 and a viscosity of 180 mPa·s.

[0047] 100 parts by weight of phenyl silicone rubber (monophenyl silicone rubber with a weight - average molecular weight of 600,000, a phenyl molar content of 30%, and a vinyl content of 0.3%) was placed in a kneader. A total of 50 parts by weight of silica TS530 was added to it in several times. After mixing evenly at 50°C, the rubber compound was taken out and left to stand at room temperature for 16 h. Then, 2 parts by weight of vulcanizing agent bis - 2,4 and 30 parts by weight of damping additive were added on an open mill and mixed evenly at 30°C. Then, it was subjected to first - stage vulcanization using a vacuum vulcanizer. The vulcanization temperature was 100°C, the vulcanization time was 10 min, and the vulcanization pressure was 10 MPa. Finally, it was subjected to second - stage vulcanization using a blast drying oven. The second - stage vulcanization conditions were: 180°C × 4 h, to obtain a phenyl silicone rubber damping material (with a thickness of 2 mm for testing).

[0048] Example 2

[0049] Referring to Example 1, 50 g of hydroxyl-terminated dimethyl polysiloxane with a number average molecular weight of 10,000 (0.005 mol) and 1.22 g (0.01 mol) of phenylboric acid were used as raw materials to prepare a damping additive (number average molecular weight of 11,248, viscosity of 13,210 mPa·s). Using this damping additive, a phenyl silicone rubber damping material was prepared according to the method of Example 1.

[0050] Example 3

[0051] Referring to Example 1, 50 g of hydroxyl-terminated dimethyl polysiloxane with a number average molecular weight of 1,000 (0.05 mol) and 3.66 g (0.03 mol) of phenylboric acid were used as raw materials to prepare a damping additive (number average molecular weight of 1,211, viscosity of 145 mPa·s). Using this damping additive, a phenyl silicone rubber damping material was prepared according to the method of Example 1.

[0052] Example 4

[0053] Referring to Example 1, 50 g of hydroxyl-terminated dimethyl polysiloxane with a number average molecular weight of 1,000 (0.05 mol) and 8.3 g (0.05 mol) of 1,4-benzenediboronic acid were used as raw materials to prepare a damping additive (number average molecular weight of 5,341, viscosity of 3,420 mPa·s). Using this damping additive, a phenyl silicone rubber damping material was prepared according to the method of Example 1.

[0054] Example 5

[0055] Referring to Example 1, 50 g of hydroxyl-terminated dimethyl polysiloxane with a number average molecular weight of 1,000 (0.05 mol) and 12.1 g (0.05 mol) of biphenyldiboronic acid were used as raw materials to prepare a damping additive (number average molecular weight of 4,423, viscosity of 3,080 mPa·s). Using this damping additive, a phenyl silicone rubber damping material was prepared according to the method of Example 1.

[0056] Comparative Example 1

[0057] Referring to Example 1, 50 g of hydroxyl-terminated dimethyl polysiloxane with a number average molecular weight of 10,000 (0.005 mol) and 0.62 g (0.01 mol) of boric acid were used as raw materials to prepare a damping additive (gel-like solid, number average molecular weight of 10,280). Using this damping additive, a phenyl silicone rubber damping material was prepared according to the method of Example 1.

[0058] Comparative Example 2

[0059] Place 100 parts by weight of phenyl silicone rubber (monophenyl silicone rubber with a phenyl molar content of 30%) in a kneader, and add 50 parts by weight of silica TS530 to it in several portions. After mixing evenly at 50 °C, take out the rubber compound and let it stand at room temperature for 16 h. Then, add 2 parts by weight of vulcanizing agent bis(2,4) to it on a two-roll mill and mix evenly at 30 °C. Then, use a vacuum vulcanizer for the first-stage vulcanization, with a vulcanization temperature of 100 °C, a vulcanization time of 10 min, and a vulcanization pressure of 10 MPa. Finally, use a blast oven for the second-stage vulcanization, and the second-stage vulcanization conditions are: 180 °C × 4 h to obtain a phenyl silicone rubber damping material (with a thickness of 2 mm for testing).

[0060] Perform mechanical property and dynamic mechanical tests on the phenyl silicone rubber damping materials obtained in Examples 1 to 5 and Comparative Examples 1 to 2. The obtained mechanical properties are shown in Table 1, and the obtained damping property results are shown in Table 2 and Figure 1 as follows.

[0061] Table 1 Mechanical Properties of Phenyl Silicone Rubber Damping Materials

[0062]

[0063] Table 2 Damping Properties of Phenyl Silicone Rubber Damping Materials

[0064]

[0065] The phenyl silicone rubber damping materials prepared in Examples 1 to 5 have excellent mechanical properties and damping properties. Compared with the phenyl silicone rubber damping material in Comparative Example 2 without a damping additive, the tanδ > 0.3 temperature range, the tanδ > 0.2 temperature range, and the loss factor at 150 °C are significantly improved. The phenyl silicone rubber damping material prepared in Comparative Example 1 using a damping additive without phenyl is far inferior to the phenyl silicone rubber damping materials prepared in Examples 1 to 5 in both mechanical properties and damping properties, and its mechanical properties decline compared with Comparative Example 2, and the tanδ > 0.3 temperature range and the tanδ > 0.2 temperature range are reduced. As Figure 2 shown, the present invention uses an aryl-containing polyborosiloxane as a damping additive, which is similar in structure to phenyl silicone rubber and has good compatibility, effectively avoiding the occurrence of phase separation, so that a boron-oxygen dynamic bond is formed between the two and dissociates and associates under dynamic strain, increasing the energy loss. Although the damping additive in Comparative Example 1 is polyborosiloxane, theoretically it can also form a boron-oxygen dynamic bond with phenyl silicone rubber, but due to its lack of phenyl, it is difficult to be compatible with phenyl silicone rubber, instead causing a decline in the mechanical properties and a reduction in the temperature range of the phenyl silicone rubber damping material.

[0066] Example 6

[0067] Place 100 parts by weight of phenyl silicone rubber (a single-phenyl silicone rubber with a weight-average molecular weight of 400,000, a phenyl molar content of 15%, and a vinyl content of 0.1%) in a kneader. Add 40 parts by weight of silica TS530 to it in several portions. After mixing evenly at 50 °C, take out the rubber compound and let it stand at room temperature for 16 h. Then, add 1 part by weight of vulcanizing agent bis(2,4) and 20 parts by weight of the damping additive of Example 1 on an open mill and mix evenly at 30 °C. Then, perform primary vulcanization using a vacuum vulcanizer. The vulcanization temperature is 100 °C, the vulcanization time is 10 min, and the vulcanization pressure is 10 MPa. Finally, perform secondary vulcanization using a forced-air oven. The secondary vulcanization conditions are: 180 °C × 4 h to obtain a phenyl silicone rubber damping material.

[0068] Example 7

[0069] Place 100 parts by weight of phenyl silicone rubber (a single-phenyl silicone rubber with a weight-average molecular weight of 800,000, a phenyl molar content of 40%, and a vinyl content of 1%) in a kneader. Add 60 parts by weight of MQ resin to it in several portions. After mixing evenly at 50 °C, take out the rubber compound and let it stand at room temperature for 16 h. Then, add 3 parts by weight of vulcanizing agent bis(2,4) and 40 parts by weight of the damping additive of Example 1 on an open mill and mix evenly at 30 °C. Then, perform primary vulcanization using a vacuum vulcanizer. The vulcanization temperature is 100 °C, the vulcanization time is 10 min, and the vulcanization pressure is 10 MPa. Finally, perform secondary vulcanization using a forced-air oven. The secondary vulcanization conditions are: 180 °C × 4 h to obtain a phenyl silicone rubber damping material.

[0070] Example 8

[0071] Place 100 parts by weight of phenyl silicone rubber (a single-phenyl silicone rubber with a phenyl molar content of 30%) in a kneader. Add 50 parts by weight of silica TS530 to it in several portions. After mixing evenly at 50 °C, take out the rubber compound and let it stand at room temperature for 16 h. Then, add 2 parts by weight of vulcanizing agent bis(2,4) and 30 parts by weight of the damping additive of Example 1 on an open mill and mix evenly at 30 °C. Then, perform primary vulcanization using a vacuum vulcanizer. The vulcanization temperature is 120 °C, the vulcanization time is 5 min, and the vulcanization pressure is 15 MPa. Finally, perform secondary vulcanization using a forced-air oven. The secondary vulcanization conditions are: 180 °C × 4 h to obtain a phenyl silicone rubber damping material.

[0072] Example 9

[0073] Place 100 parts by weight of phenyl silicone rubber (a single-phenyl silicone rubber with a weight-average molecular weight of 600,000, a phenyl molar content of 30%, and a vinyl content of 0.5%) in a kneader. Add 50 parts by weight of silica TS530 to it in several portions. After mixing evenly at 50 °C, take out the rubber compound and let it stand at room temperature for 16 h. Then, add 2 parts by weight of vulcanizing agent bis(2,4) and 30 parts by weight of the damping additive of Example 1 on an open mill and mix evenly at 30 °C. Then, perform primary vulcanization using a vacuum vulcanizer. The vulcanization temperature is 80 °C, the vulcanization time is 15 min, and the vulcanization pressure is 5 MPa. Finally, perform secondary vulcanization using a forced-air oven. The secondary vulcanization conditions are: 180 °C × 4 h to obtain a phenyl silicone rubber damping material.

[0074] Example 10

[0075] Place 100 parts by weight of phenyl silicone rubber (a single-phenyl silicone rubber with a weight-average molecular weight of 600,000, a phenyl molar content of 30%, and a vinyl content of 0.5%) in a kneader. Add 50 parts by weight of silica TS530 to it in several portions. After mixing evenly at 50 °C, take out the rubber compound and let it stand at room temperature for 16 h. Then, add 2 parts by weight of vulcanizing agent bis(2,4) and 30 parts by weight of the damping additive of Example 1 on an open mill and mix evenly at 30 °C. Then, perform primary vulcanization using a vacuum vulcanizer. The vulcanization temperature is 100 °C, the vulcanization time is 10 min, and the vulcanization pressure is 10 MPa. Finally, perform secondary vulcanization using a forced-air oven. The secondary vulcanization conditions are: 160 °C × 6 h to obtain a phenyl silicone rubber damping material.

[0076] Example 11

[0077] Place 100 parts by weight of phenyl silicone rubber (a single-phenyl silicone rubber with a weight-average molecular weight of 600,000, a phenyl molar content of 30%, and a vinyl content of 0.5%) in a kneader. Add 50 parts by weight of silica TS530 to it in several portions. After mixing evenly at 50 °C, take out the rubber compound and let it stand at room temperature for 16 h. Then, add 2 parts by weight of vulcanizing agent bis(2,4) and 30 parts by weight of the damping additive of Example 1 on an open mill and mix evenly at 30 °C. Then, perform primary vulcanization using a vacuum vulcanizer. The vulcanization temperature is 100 °C, the vulcanization time is 10 min, and the vulcanization pressure is 10 MPa. Finally, perform secondary vulcanization using a forced-air oven. The secondary vulcanization conditions are: 200 °C × 2 h to obtain a phenyl silicone rubber damping material.

[0078] Example 12

[0079] Referring to Example 1, 50 g of hydroxy-terminated polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and methylphenylsiloxane segments, and the quantity ratio of dimethylsiloxane segments to methylphenylsiloxane segments is 30%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and the phenyl silicone rubber damping material was prepared by using this damping additive according to the method of Example 1.

[0080] Example 13

[0081] Referring to Example 1, 50 g of hydroxy-terminated polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and methylvinylsiloxane segments, and the quantity ratio of dimethylsiloxane segments to methylvinylsiloxane segments is 20%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and the phenyl silicone rubber damping material was prepared by using this damping additive according to the method of Example 1.

[0082] Example 14

[0083] Referring to Example 1, 50 g of hydroxy-terminated polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and methylsiloxane segments, and the quantity ratio of dimethylsiloxane segments to methylsiloxane segments is 10%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and the phenyl silicone rubber damping material was prepared by using this damping additive according to the method of Example 1.

[0084] Example 15

[0085] Referring to Example 1, 50 g of hydroxy-terminated polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and divinylsiloxane segments, and the quantity ratio of dimethylsiloxane segments to divinylsiloxane segments is 30%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and the phenyl silicone rubber damping material was prepared by using this damping additive according to the method of Example 1.

[0086] Example 16

[0087] Referring to Example 1, 50 g of hydroxy-terminated polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and vinylphenylsiloxane segments, and the quantity ratio of dimethylsiloxane segments to vinylphenylsiloxane segments is 30%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and the phenyl silicone rubber damping material was prepared by using this damping additive according to the method of Example 1.

[0088] Example 17

[0089] Referring to Example 1, 50 g of a hydroxyl-terminated polysiloxane with a number-average molecular weight of 1000 (composed of dimethylsiloxane segments and vinylsiloxane segments, and the quantity ratio of dimethylsiloxane segments to vinylsiloxane segments is 30%) and 6.1 g (0.05 mol) of phenylboronic acid were used as raw materials to prepare a damping additive, and using this damping additive, a phenyl silicone rubber damping material was prepared according to the method of Example 1.

[0090] Example 18

[0091] Referring to Example 1, 50 g of a hydroxyl-terminated polysiloxane with a number-average molecular weight of 1000 (composed of dimethylsiloxane segments and diphenylsiloxane segments, and the quantity ratio of dimethylsiloxane segments to diphenylsiloxane segments is 30%) and 6.1 g (0.05 mol) of phenylboronic acid were used as raw materials to prepare a damping additive, and using this damping additive, a phenyl silicone rubber damping material was prepared according to the method of Example 1.

[0092] Example 19

[0093] Referring to Example 1, 50 g of a hydroxyl-terminated polysiloxane with a number-average molecular weight of 1000 (composed of dimethylsiloxane segments and phenylsiloxane segments, and the quantity ratio of dimethylsiloxane segments to phenylsiloxane segments is 30%) and 6.1 g (0.05 mol) of phenylboronic acid were used as raw materials to prepare a damping additive, and using this damping additive, a phenyl silicone rubber damping material was prepared according to the method of Example 1.

[0094] Example 20

[0095] Referring to Example 1, 50 g of a hydroxyl-terminated polysiloxane with a number-average molecular weight of 1000 (composed of dimethylsiloxane segments and siloxane segments, and the quantity ratio of dimethylsiloxane segments to siloxane segments is 30%) and 6.1 g (0.05 mol) of phenylboronic acid were used as raw materials to prepare a damping additive, and using this damping additive, a phenyl silicone rubber damping material was prepared according to the method of Example 1.

[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 modifications and changes. Any modifications, equivalent replacements, improvements, 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 phenyl silicone rubber damping material, characterized in that, The phenyl silicone rubber damping material comprises phenyl silicone rubber and a damping additive, the mass ratio of the phenyl silicone rubber to the damping additive is 1:(0.2 - 0.4), the damping additive is a polyborosiloxane containing aryl groups, the aryl group concentration in the polyborosiloxane is 0.1 - 2 mol / kg, and the aryl groups include one or more of phenyl, biphenyl, naphthyl, and anthracenyl; the temperature range of the phenyl silicone rubber damping material with tanδ > 0.2 is 218°C - 334°C, the starting temperature of the temperature range with tanδ > 0.2 is -84°C - -81°C, the maximum tanδ is 0.56 - 1.1, and the tensile strength is 5.3 - 5.9 Mpa; The phenyl silicone rubber includes monophenyl silicone rubber, the weight-average molecular weight of the phenyl silicone rubber is 400,000 - 800,000, the phenyl content is 15% - 40%, and the vinyl content is 0.1% - 1%.

2. The phenyl silicone rubber damping material according to claim 1, characterized in that The temperature range of the phenyl silicone rubber damping material with tanδ > 0.3 is 26°C - 36°C, the starting temperature of the temperature range with tanδ > 0.3 is -81°C - -80°C, and the tanδ at 150°C is 0.19 - 0.

29.

3. The phenyl silicone rubber damping material according to claim 1, characterized in that The elongation at break of the phenyl silicone rubber damping material is 684% - 742%, and the hardness is 28 - 31.

4. A preparation method of a phenyl silicone rubber damping material, characterized in that, It includes the following steps: Mix the phenyl silicone rubber and the reinforcing filler evenly and then let it stand, then add the vulcanizing agent and the damping additive and mix evenly, then carry out primary vulcanization, and finally carry out secondary vulcanization to obtain the phenyl silicone rubber damping material; The mass ratio of the phenyl silicone rubber to the damping additive is 1:(0.2 - 0.4), the damping additive is a polyborosiloxane containing aryl groups, the aryl group concentration in the polyborosiloxane is 0.1 - 2 mol / kg, and the aryl groups include one or more of phenyl, biphenyl, naphthyl, and anthracenyl; The phenyl silicone rubber includes monophenyl silicone rubber, the weight-average molecular weight of the phenyl silicone rubber is 400,000 - 800,000, the phenyl content is 15% - 40%, and the vinyl content is 0.1% - 1%.

5. The preparation method according to claim 4, characterized in that, The polyborosiloxane is obtained by reacting a hydroxyl-terminated polysiloxane with an arylboric acid in a molar ratio of 1:(0.6 - 3), the hydroxyl-terminated polysiloxane includes hydroxyl-terminated dimethyl polysiloxane, and the arylboric acid includes one or more combinations of benzeneboronic acid, 1,4-benzenediboronic acid, 1,3-benzenediboronic acid, biphenyldiboronic acid, and anthracene-9,10-diboronic acid.

6. The preparation method according to claim 4, characterized in that The reinforcing filler includes one or more of MQ resin and silica, and the mass ratio of the phenyl silicone rubber to the reinforcing filler is 1:(0.4 - 0.6); the vulcanizing agent includes vulcanizing agent bis-2,4, and the mass ratio of the phenyl silicone rubber to the vulcanizing agent is 1:(0.01 - 0.03).

7. The preparation method according to claim 4, characterized in that, Mix the phenyl silicone rubber and the reinforcing filler evenly at 40°C - 60°C and then let it stand at room temperature for 12 - 20 h, and then add the vulcanizing agent and the damping additive and mix evenly at 20°C - 40°C.

8. The preparation method according to claim 4, characterized in that, The vulcanization temperature of the primary vulcanization is 80°C - 120°C, the vulcanization time is 5 - 15 min, and the vulcanization pressure is 5 - 15 MPa; the vulcanization temperature of the secondary vulcanization is 160°C - 200°C, and the vulcanization time is 2 - 6 h.

9. The application of the phenyl silicone rubber damping material according to any one of claims 1 to 3 or the phenyl silicone rubber damping material obtained by the preparation method according to any one of claims 4 to 8 in aerospace, weaponry, ships and vehicles, or electronic machinery.

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