Phenyl siloxane rubber damping material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of organic silicon damping materials, and particularly relates to a phenyl silicone rubber damping material and a preparation method and application thereof. According to the phenyl silicone rubber damping material, the temperature range of tan delta larger than 0.3 is 26-36 DEG C, the starting temperature of the temperature range of tan delta larger than 0.3 is-81 DEG C to-80 DEG C, the maximum tan delta is 0.56-1.1, and the tensile strength is 5.3-5.9 MPa. Due to the good compatibility and dynamic bonds of the phenyl silicone rubber and the damping additive, the damping temperature range of the phenyl silicone rubber damping material is widened, the loss factor is improved, and the phenyl silicone rubber damping material has excellent damping performance and mechanical performance.

Description

Technical Field

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

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] During the operation or movement of mechanical equipment, there will be inevitable vibration at the macro or micro level, and as the operating capacity of the mechanical equipment increases, the vibration becomes more severe. Vibration not only significantly affects the accuracy, reliability and stability of mechanical equipment, but also damages the precision components inside the mechanical equipment and shortens the service life of the mechanical equipment. Therefore, it is necessary to develop high-performance damping materials to effectively reduce the vibration of mechanical equipment during operation and avoid the adverse effects of vibration.

[0004] The structure of silicone rubber, which consists of the main chain -Si-O-Si- and the side chain of organic groups, brings it many excellent properties such as weather resistance, aging resistance, electrical insulation, ozone resistance, hydrophobicity, flame retardancy, and physiological inertness, making it widely used in aerospace, weapons and equipment, ships and vehicles, electronic machinery and other fields. 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 effective damping (tanδ>0.3) temperature range is narrow, which is difficult to meet the needs of damping materials.

[0005] The main modification methods to improve the damping performance of silicone rubber include blending, copolymerization, construction of interpenetrating networks (IPNs) and addition of damping additives. Among them, adding damping additives is the simplest and most efficient and is widely used. However, damping additives have their own mechanical properties and weather resistance that are not ideal, which will lead to a decrease in performance after mixing with silicone rubber, poor compatibility with silicone rubber, resulting in phase separation, and affecting the glass transition temperature of silicone rubber. As a result, the mechanical properties, weather resistance and damping properties of silicone rubber modified with damping additives cannot meet the needs at the same time, limiting the application field 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 and a preparation method and application thereof. Thanks to the good compatibility and dynamic bond 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 improved, and it has excellent damping performance and mechanical properties.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions: In the 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℃~334℃, the starting temperature of the temperature range of tanδ>0.2 is -84℃~-81℃, the maximum tanδ is 0.56~1.1, and the tensile strength is 5.3~5.9 MPa.

[0008] Preferably, the temperature range of tanδ>0.3 of the phenyl silicone rubber damping material is 26°C~36°C, the starting temperature of tanδ>0.3 temperature range is -81°C~-80°C, and the tanδ at 150°C is 0.19~0.29.

[0009] Preferably, the phenyl silicone rubber damping material has an elongation at break of 684% to 742% and a hardness of 28 to 31.

[0010] Preferably, 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 an aromatic group, the concentration of the aromatic group in the polyborosiloxane is 0.1~2 mol / kg, and the aromatic group comprises one or more of phenyl, biphenyl, naphthyl and anthracene.

[0011] More preferably, it has a structure as shown in Formula I, Formula II, Formula III or Formula IV: Formula I; Formula II; Formula III; Formula IV; In the formula, R3 is selected from one of phenyl, biphenyl and anthracene, a is selected from a positive integer from 1 to 5, b: a≤50%, and the structural formula of A is shown in V: Formula V; In the formula, R1 and R2 are independently selected from one or a combination of methyl, phenyl, vinyl and hydrogen atoms, m:n≤30%, m≤100.

[0012] Further preferably, the viscosity of the polyborosiloxane damping additive is 100-20000 mPa·s.

[0013] More preferably, the number average molecular weight of A is 1,000 to 10,000.

[0014] More preferably, R1 and R2 are both methyl groups.

[0015] More preferably, a is 1 or 2, and b is 1.

[0016] More 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%.

[0017] Further preferably, the phenyl silicone rubber damping material also includes a reinforcing filler and a vulcanizer, the reinforcing filler includes one or more of MQ resin and white carbon black, and the mass ratio of the phenyl silicone rubber to the reinforcing filler is 1:(0.4~0.6); the vulcanizer includes a vulcanizer di-2,4, and the mass ratio of the phenyl silicone rubber to the vulcanizer is 1:(0.01~0.03).

[0018] In a second aspect, the present invention provides a method for preparing a phenyl silicone rubber damping material, comprising the following steps: The phenyl silicone rubber and the reinforcing filler are mixed evenly and then allowed to stand, and then a vulcanizing agent and a damping additive are added and mixed evenly, and then a first-stage vulcanization is performed, and finally a second-stage vulcanization is performed to obtain a 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 polyborosiloxane containing aromatic groups, the concentration of aromatic groups in the polyborosiloxane is 0.1~2 mol / kg, and the aromatic groups include one or more of phenyl, biphenyl, naphthyl and anthracene.

[0019] Preferably, the polyborosiloxane has a number average molecular weight of 1000-20000 and a viscosity of 100-20000 mPa·s.

[0020] 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%.

[0021] Preferably, the polyborosiloxane is obtained by reacting terminal hydroxyl polysiloxane with aryl boronic acid in a molar ratio of 1:(0.6~3), the terminal hydroxyl polysiloxane includes terminal hydroxyl dimethyl polysiloxane, and the aryl boronic acid includes a combination of one or more of phenylboric acid, 1,4-phenyldiboric acid, 1,3-phenyldiboric acid, biphenyldiboric acid, and anthracene-9,10 diboric acid.

[0022] Further preferably, the number average molecular weight of the terminal hydroxyl polysiloxane is 1000-10000, and the structural formula of the terminal hydroxyl polysiloxane is as shown in Formula VI: Formula VI.

[0023] Preferably, the reinforcing filler includes one or more of MQ resin and white carbon black, and the mass ratio of the phenyl silicone rubber to the reinforcing filler is 1:(0.4~0.6); the vulcanizing agent includes the vulcanizing agent bis-2,4 (2,4-dichlorobenzoyl peroxide), and the mass ratio of the phenyl silicone rubber to the vulcanizing agent is 1:(0.01~0.03).

[0024] Preferably, the phenyl silicone rubber and the reinforcing filler are mixed uniformly at 40°C to 60°C, left to stand at room temperature for 12 to 20 hours, and then the vulcanizing agent and the damping additive are added and mixed uniformly at 20°C to 40°C.

[0025] 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.

[0026] In a third aspect, the present invention provides the use 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, weapon equipment, ship vehicles or electronic machinery.

[0027] The beneficial effects achieved by one or more technical solutions of the present invention are as follows: The phenyl silicone rubber damping material of the present invention has a tanδ>0.3 temperature range of 26°C to 36°C, a starting temperature of tanδ>0.3 temperature range of -81°C to -80°C, a maximum tanδ of 0.56 to 1.1, a tanδ>0.2 temperature range of 218°C to 334°C, and a tensile strength of 5.3 to 5.9 MPa. The material has excellent damping performance and mechanical properties, is suitable for damping needs under high and low temperatures, and broadens the application range of phenyl silicone rubber as a damping material.

[0028] The phenyl silicone rubber damping material of the present invention uses polyborosiloxane containing aromatic groups as a damping additive, which has good compatibility with phenyl silicone rubber and avoids phase separation. The conjugated effect produced by the two improves energy dissipation and can form boron-oxygen dynamic bonds, which together improve the damping performance of the phenyl silicone rubber damping material. The phenyl silicone rubber damping material has excellent mechanical properties and the glass transition temperature is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0030] Figure 1 The dynamic mechanical curves of the phenyl silicone rubber damping materials of Examples 1 to 5 and Comparative Examples 1 to 2 of the present invention; Figure 2 This is the damping mechanism of the phenyl silicone rubber damping material of the present invention. DETAILED DESCRIPTION

[0031] 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 embodiments and comparative examples.

[0032] Example 1 50 g of terminal hydroxy dimethyl polysiloxane (0.05 mol) with a number average molecular weight of 1000 was mixed with 100 ml of toluene, and 6.1 g (0.05 mol) of phenylboric acid was slowly added under stirring at room temperature. The mixture was stirred at room temperature for 30 min, then heated to 120°C, stirred at 120°C for 10 h, and then the reaction system was cooled to room temperature, and the unreacted phenylboric acid was filtered out, and then the solvent toluene was removed by rotary evaporation. The mixture was then 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.

[0033] 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, and 50 parts by weight of white carbon black TS530 were added thereto in several times. After mixing evenly at 50°C, the rubber material was taken out and allowed to stand at room temperature for 16 h. Then, 2 parts by weight of vulcanizing agent di-2,4 and 30 parts by weight of damping additive were added on an open mill and mixed evenly at 30°C. Then, a vacuum vulcanizer was used for one-stage vulcanization at a vulcanization temperature of 100°C, a vulcanization time of 10 min, and a vulcanization pressure of 10 MPa. Finally, a blast oven was used for two-stage vulcanization at a condition of 180°C × 4 h to obtain a phenyl silicone rubber damping material (with a thickness of 2 mm for testing).

[0034] Example 2 Referring to Example 1, 50 g of terminal hydroxy dimethyl polysiloxane (0.005 mol) with a number average molecular weight of 10,000 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). The damping additive was used to prepare a phenyl silicone rubber damping material according to the method of Example 1.

[0035] Example 3 Referring to Example 1, 50 g of terminal hydroxy dimethyl polysiloxane (0.05 mol) with a number average molecular weight of 1000 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 1211, viscosity of 145 mPa·s), and the phenyl silicone rubber damping material was prepared using the damping additive according to the method of Example 1.

[0036] Example 4 Referring to Example 1, 50 g of terminal hydroxy dimethyl polysiloxane (0.05 mol) with a number average molecular weight of 1000 and 8.3 g (0.05 mol) of 1,4-phenylenediboric acid were used as raw materials to prepare a damping additive (number average molecular weight of 5341, viscosity of 3420 mPa·s), and a phenyl silicone rubber damping material was prepared using the damping additive according to the method of Example 1.

[0037] Example 5 Referring to Example 1, 50 g of terminal hydroxy dimethyl polysiloxane (0.05 mol) with a number average molecular weight of 1000 and 12.1 g (0.05 mol) of biphenyl diboric acid were used as raw materials to prepare a damping additive (number average molecular weight of 4423, viscosity of 3080 mPa·s), and the phenyl silicone rubber damping material was prepared using the damping additive according to the method of Example 1.

[0038] Comparative Example 1 Referring to Example 1, 50 g of terminal hydroxy dimethyl polysiloxane (0.005 mol) with a number average molecular weight of 10,000 and 0.62 g (0.01 mol) of boric acid were used as raw materials to prepare a damping additive (gel-like solid with a number average molecular weight of 10,280). The damping additive was used to prepare a phenyl silicone rubber damping material according to the method of Example 1.

[0039] Comparative Example 2 100 parts by weight of phenyl silicone rubber (monophenyl silicone rubber with a phenyl molar content of 30%) was placed in a kneader, and 50 parts by weight of white carbon black TS530 were added thereto in several times. After mixing evenly at 50°C, the rubber material was taken out and allowed to stand at room temperature for 16 h. Then, 2 parts by weight of vulcanizing agent di-2,4 was added on an open mill and mixed evenly at 30°C. Then, a vacuum vulcanizer was used for one-stage vulcanization at a vulcanization temperature of 100°C, a vulcanization time of 10 min, and a vulcanization pressure of 10 MPa. Finally, a blast oven was used for two-stage vulcanization at a condition of 180°C × 4 h to obtain a phenyl silicone rubber damping material (with a thickness of 2 mm for testing).

[0040] The phenyl silicone rubber damping materials obtained in Examples 1 to 5 and Comparative Examples 1 to 2 were subjected to mechanical property and dynamic mechanical tests. The obtained mechanical properties are shown in Table 1, and the obtained damping performance results are shown in Tables 2 and Figure 1 shown.

[0041] Table 1 Mechanical properties of phenyl silicone rubber damping materials

[0042] Table 2 Damping properties of phenyl silicone rubber damping materials

[0043] 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 materials in Comparative Example 2 without adding damping additives, the loss factor in the temperature range of tanδ>0.3, the temperature range of tanδ>0.2 and at 150°C is significantly improved. The phenyl silicone rubber damping material prepared in Comparative Example 1 using damping additives that do not contain phenyl is far inferior to the phenyl silicone rubber damping materials prepared in Examples 1 to 5 in terms of mechanical properties and damping properties, and its mechanical properties are reduced compared with Comparative Example 2, and the temperature range of tanδ>0.3 and tanδ>0.2 are reduced. Figure 2 As shown, the present invention uses polyborosiloxane containing aromatic groups as a damping additive, which is similar to the structure of phenyl silicone rubber, has good compatibility, and effectively avoids the occurrence of phase separation, so that the boron oxygen dynamic bond generated between the two dissociates and associates under dynamic strain, increasing energy loss. Although the damping additive of Comparative Example 1 is polyborosiloxane, which can theoretically also form a boron oxygen dynamic bond with phenyl silicone rubber, it is difficult to achieve compatibility with phenyl silicone rubber because it does not contain phenyl groups, but instead causes the mechanical properties of the phenyl silicone rubber damping material to decrease and the temperature range to shrink.

[0044] Example 6 100 parts by weight of phenyl silicone rubber (monophenyl silicone rubber with a weight average molecular weight of 400,000, a phenyl molar content of 15%, and a vinyl content of 0.1%) was placed in a kneader, and 40 parts by weight of white carbon black TS530 were added thereto in multiple times. After mixing evenly at 50°C, the rubber material was taken out and allowed to stand at room temperature for 16 h. Then, 1 part by weight of vulcanizing agent di-2,4 and 20 parts by weight of the damping additive of Example 1 were added on an open mill and mixed evenly at 30°C. Then, a vacuum vulcanizer was used for one-stage vulcanization at a vulcanization temperature of 100°C, a vulcanization time of 10 min, and a vulcanization pressure of 10 MPa. Finally, a blast oven was used for two-stage vulcanization at a condition of 180°C×4 h to obtain a phenyl silicone rubber damping material.

[0045] Example 7 100 parts by weight of phenyl silicone rubber (monophenyl silicone rubber with a weight average molecular weight of 800,000, a phenyl molar content of 40%, and a vinyl content of 1%) was placed in a kneader, and 60 parts by weight of MQ resin were added thereto in multiple times. After mixing evenly at 50°C, the rubber was taken out and allowed to stand at room temperature for 16 h. Then, 3 parts by weight of vulcanizing agent bis 2,4 and 40 parts by weight of the damping additive of Example 1 were added on an open mill and mixed evenly at 30°C. Then, a vacuum vulcanizer was used for one-stage vulcanization at a vulcanization temperature of 100°C, a vulcanization time of 10 min, and a vulcanization pressure of 10 MPa. Finally, a blast oven was used for two-stage vulcanization at a condition of 180°C×4 h to obtain a phenyl silicone rubber damping material.

[0046] Example 8 100 parts by weight of phenyl silicone rubber (monophenyl silicone rubber with a phenyl molar content of 30%) was placed in a kneader, and 50 parts by weight of white carbon black TS530 were added thereto in multiple times. After mixing evenly at 50°C, the rubber material was taken out and allowed 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 the damping additive of Example 1 were added on an open mill and mixed evenly at 30°C. Then, a vacuum vulcanizer was used for one-stage vulcanization at a vulcanization temperature of 120°C, a vulcanization time of 5 min, and a vulcanization pressure of 15 MPa. Finally, a blast oven was used for two-stage vulcanization at a condition of 180°C×4 h to obtain a phenyl silicone rubber damping material.

[0047] Example 9 100 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 0.5%) was placed in a kneader, and 50 parts by weight of white carbon black TS530 were added thereto in multiple times. After mixing evenly at 50°C, the rubber material was taken out and allowed 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 the damping additive of Example 1 were added on an open mill and mixed evenly at 30°C. Then, a vacuum vulcanizer was used for one-stage vulcanization at a vulcanization temperature of 80°C, a vulcanization time of 15 min, and a vulcanization pressure of 5 MPa. Finally, a blast oven was used for two-stage vulcanization at a condition of 180°C×4 h to obtain a phenyl silicone rubber damping material.

[0048] Example 10 100 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 0.5%) was placed in a kneader, and 50 parts by weight of white carbon black TS530 were added thereto in multiple times. After mixing evenly at 50°C, the rubber material was taken out and allowed to stand at room temperature for 16 h. Then, 2 parts by weight of vulcanizing agent di-2,4 and 30 parts by weight of the damping additive of Example 1 were added on an open mill and mixed evenly at 30°C. Then, a vacuum vulcanizer was used for one-stage vulcanization at a vulcanization temperature of 100°C, a vulcanization time of 10 min, and a vulcanization pressure of 10 MPa. Finally, a blast oven was used for two-stage vulcanization at a condition of 160°C×6 h to obtain a phenyl silicone rubber damping material.

[0049] Embodiment 11 100 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 0.5%) was placed in a kneader, and 50 parts by weight of white carbon black TS530 were added thereto in multiple times. After mixing evenly at 50°C, the rubber material was taken out and allowed to stand at room temperature for 16 h. Then, 2 parts by weight of vulcanizing agent di-2,4 and 30 parts by weight of the damping additive of Example 1 were added on an open mill and mixed evenly at 30°C. Then, a vacuum vulcanizer was used for one-stage vulcanization at a vulcanization temperature of 100°C, a vulcanization time of 10 min, and a vulcanization pressure of 10 MPa. Finally, a blast oven was used for two-stage vulcanization at a condition of 200°C×2 h to obtain a phenyl silicone rubber damping material.

[0050] Example 12 Referring to Example 1, 50 g of terminal hydroxyl polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and methylphenylsiloxane segments, with the ratio of dimethylsiloxane segments to methylphenylsiloxane segments being 30%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and a phenyl silicone rubber damping material was prepared using the damping additive according to the method of Example 1.

[0051] Example 13 Referring to Example 1, 50 g of terminal hydroxyl polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and methylvinylsiloxane segments, with the number ratio of dimethylsiloxane segments to methylvinylsiloxane segments being 20%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and a phenyl silicone rubber damping material was prepared using the damping additive according to the method of Example 1.

[0052] Embodiment 14 Referring to Example 1, 50 g of terminal hydroxyl polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and methylsiloxane segments, with the ratio of dimethylsiloxane segments to methylsiloxane segments being 10%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and a phenyl silicone rubber damping material was prepared using the damping additive according to the method of Example 1.

[0053] Embodiment 15 Referring to Example 1, 50 g of terminal hydroxyl polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and divinylsiloxane segments, with the number ratio of dimethylsiloxane segments to divinylsiloxane segments being 30%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and a phenyl silicone rubber damping material was prepared using the damping additive according to the method of Example 1.

[0054] Example 16 Referring to Example 1, 50 g of terminal hydroxyl polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and vinylphenylsiloxane segments, with the number ratio of dimethylsiloxane segments to vinylphenylsiloxane segments being 30%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and a phenyl silicone rubber damping material was prepared using the damping additive according to the method of Example 1.

[0055] Embodiment 17 Referring to Example 1, 50 g of terminal hydroxyl polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and vinylsiloxane segments, with the number ratio of dimethylsiloxane segments to vinylsiloxane segments being 30%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and a phenyl silicone rubber damping material was prepared using the damping additive according to the method of Example 1.

[0056] Embodiment 18 Referring to Example 1, 50 g of terminal hydroxyl polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and diphenylsiloxane segments, with the ratio of dimethylsiloxane segments to diphenylsiloxane segments being 30%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and a phenyl silicone rubber damping material was prepared using the damping additive according to the method of Example 1.

[0057] Embodiment 19 Referring to Example 1, 50 g of terminal hydroxyl polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and phenylsiloxane segments, with the number ratio of dimethylsiloxane segments to phenylsiloxane segments being 30%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and a phenyl silicone rubber damping material was prepared using the damping additive according to the method of Example 1.

[0058] Embodiment 20 Referring to Example 1, 50 g of terminal hydroxyl polysiloxane with a number average molecular weight of 1000 (composed of dimethylsiloxane segments and siloxane segments, with the ratio of dimethylsiloxane segments to siloxane segments being 30%) and 6.1 g (0.05 mol) of phenylboric acid were used as raw materials to prepare a damping additive, and a phenyl silicone rubber damping material was prepared using the damping additive according to the method of Example 1.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A phenyl silicone rubber damping material, characterized in that: The temperature range of tanδ>0.2 of the phenyl silicone rubber damping material is 218℃~334℃, the starting temperature of tanδ>0.2 temperature range is -84℃~-81℃, the maximum tanδ is 0.56~1.1, and the tensile strength is 5.3~5.9 MPa.

2. The phenyl silicone rubber damping material according to claim 1, characterized in that: The temperature range of tanδ>0.3 of the phenyl silicone rubber damping material is 26°C~36°C, the starting temperature of tanδ>0.3 temperature range 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 phenyl silicone rubber damping material has a tensile elongation of 684% to 742% and a hardness of 28 to 31.

4. A method for preparing a phenyl silicone rubber damping material, characterized in that: The following steps are involved: The phenyl silicone rubber and the reinforcing filler are mixed evenly and then allowed to stand, and then a vulcanizing agent and a damping additive are added and mixed evenly, and then a first-stage vulcanization is performed, and finally a second-stage vulcanization is performed to obtain a 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 polyborosiloxane containing aromatic groups, the concentration of aromatic groups in the polyborosiloxane is 0.1~2 mol / kg, and the aromatic groups include one or more of phenyl, biphenyl, naphthyl and anthracene.

5. The preparation method according to claim 4, characterized in that: The phenyl silicone rubber includes 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%.

6. The preparation method according to claim 4, characterized in that: The polyborosiloxane is obtained by reacting terminal hydroxyl polysiloxane with aryl boronic acid in a molar ratio of 1:(0.6-3), wherein the terminal hydroxyl polysiloxane includes terminal hydroxyl dimethyl polysiloxane, and the aryl boronic acid includes a combination of one or more of phenylboric acid, 1,4-phenyldiboric acid, 1,3-phenyldiboric acid, biphenyldiboric acid, and anthracene-9,10diboric acid.

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

8. The preparation method according to claim 4, characterized in that: Mix the phenyl silicone rubber and reinforcing filler at 40℃~60℃ and let stand at room temperature for 12~20 hours. Then add the vulcanizer and damping additive and mix them at 20℃~40℃.

9. The preparation method according to claim 4, characterized in that: The vulcanization temperature of the first stage vulcanization is 80℃~120℃, the vulcanization time is 5~15 min, and the vulcanization pressure is 5~15 MPa; the vulcanization temperature of the second stage vulcanization is 160℃~200℃, and the vulcanization time is 2~6 h.

10. Use of the phenyl silicone rubber damping material according to any one of claims 1 to 3 and / or the phenyl silicone rubber damping material obtained by the preparation method according to any one of claims 4 to 9 in aerospace, weapon equipment, ship vehicles or electronic machinery.

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