Silicone rubber composite material as well as preparation method and application thereof

Abstract

The invention relates to a silicone rubber composite material and a preparation method and application thereof, and belongs to the technical field of rubber materials. According to the preparation method, two kinds of double-end vinyl linear silicone oil with large molecular weight difference are taken as matrixes, hydrogen-containing silicone oil is taken as a cross-linking agent, a catalyst, a heat-conducting filler and an inhibitor are added, and a non-uniform network formed by long and short chains is obtained through cross-linking, so that the mechanical property of the composite material is remarkably improved, and meanwhile, the filling amount of the heat-conducting filler can be improved on the premise of ensuring pouring molding; therefore, the thermal conductivity of the composite material is improved, and the silicone rubber composite material which is excellent in mechanical property, easy to pour and high in thermal conductivity is obtained.

Description

Technical Field

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

[0002] With the increase in energy demand, the heat dissipation problem of equipment in the power and electrical industries needs to be solved urgently. In order to ensure its stable operation, thermal conductive materials with high thermal conductivity are generally used to meet the heat dissipation needs of the equipment, which requires the thermal conductive materials to have good thermal conductivity and insulation properties. Since air is a poor conductor of heat, the thermal conductive material needs to maintain close contact with the equipment to ensure effective heat transfer, which requires the thermal conductive material to have good processing properties. In addition, shock, vibration and other phenomena may occur during the operation of the equipment, which requires the thermal conductive material to be able to withstand certain tensile and compressive deformations to reduce the impact of external forces on the heat dissipation of the equipment. Therefore, the thermal conductive material must have good thermal conductivity, processing performance and mechanical properties at the same time to meet the actual use requirements.

[0003] Thermally conductive silicone rubber composites are a common polymer thermally conductive material with advantages such as electrical insulation and castability, and are widely used in the fields of power and electricity. However, pure silicone rubber has low intrinsic thermal conductivity and weak mechanical properties, which are far from meeting the actual use requirements; usually a large amount of thermally conductive fillers and reinforcing fillers are used to improve its thermal conductivity, fracture strength and modulus, but a large amount of particle filling leads to a sharp increase in the viscosity of the system, making it difficult to cast and mold, and the elongation at break of silicone rubber composites is significantly reduced.

[0004] Therefore, it is of great significance to prepare a silicone rubber composite material with excellent mechanical properties, easy pouring and high thermal conductivity. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems existing in the above-mentioned prior art and to provide a silicone rubber composite material and a preparation method and application thereof.

[0006] The present invention is achieved through the following technical solutions:

[0007] In a first aspect, the present invention provides a silicone rubber composite material, comprising the following components, measured by mass: 90-100 parts of a vinyl silicone oil composition, 7-15 parts of a hydrogenated silicone oil, 50-100 parts of a thermally conductive filler, 0.3-0.5 parts of a catalyst, and 0.01-0.04 parts of an inhibitor; the vinyl silicone oil composition comprises a double-ended vinyl linear silicone oil A and a double-ended vinyl linear silicone oil B, the molecular weight of the double-ended vinyl linear silicone oil A is 500g / mol-2000g / mol, and the molecular weight of the double-ended vinyl linear silicone oil B is 80000g / mol-150000g / mol.

[0008] The present invention uses two double-terminated vinyl linear silicone oils with a large difference in molecular weight as a matrix, hydrogen-containing silicone oil as a cross-linking agent, and adds a catalyst, a thermally conductive filler, and an inhibitor. Through cross-linking, an uneven network composed of long and short chains is obtained, which significantly improves the mechanical properties of the composite material. At the same time, the filling amount of the thermally conductive filler can be increased under the premise of ensuring casting and molding, that is, the thermal conductivity of the composite material is improved, and a silicone rubber composite material with excellent mechanical properties, easy casting, and high thermal conductivity is obtained.

[0009] Preferably, in the vinyl silicone oil composition, the mass ratio of the dual-terminal vinyl linear silicone oil B to the dual-terminal vinyl linear silicone oil A is 4:1-10:1.

[0010] More preferably, in the vinyl silicone oil composition, the mass ratio of the dual-terminal vinyl linear silicone oil B to the dual-terminal vinyl linear silicone oil A is 5:1-8:1.

[0011] The mass ratio of the double-terminal vinyl linear silicone oil B to the double-terminal vinyl linear silicone oil A will affect the performance of the composite material. The present invention has found that when the ratio of the two is within the above range, the material can have better comprehensive performance.

[0012] Preferably, the ratio of the molecular weight of the dual-terminated vinyl linear silicone oil B to the molecular weight of the dual-terminated vinyl linear silicone oil A is ≥40.

[0013] Preferably, the hydrogen-containing silicone oil includes at least one of side chain hydrogen-containing silicone oil and terminal side chain hydrogen-containing silicone oil.

[0014] Preferably, the hydrogen content in the hydrogen-containing silicone oil is 0.5%-1%.

[0015] Preferably, the thermally conductive filler includes at least one of boron nitride, aluminum oxide, and zinc oxide; more preferably, the thermally conductive filler includes at least one of boron nitride and aluminum oxide.

[0016] Preferably, the catalyst comprises a Custer catalyst.

[0017] Preferably, the inhibitor includes an acetylene alcohol inhibitor; specifically, the acetylene alcohol inhibitor includes at least one of 3-methyl-hexynyl-3-ol, 3,5-dimethyl-1-hexynyl-3-ol, and 1-ethynyl-1-cyclohexanol.

[0018] In a second aspect, the present invention provides a method for preparing the silicone rubber composite material, comprising the following steps:

[0019] S1. The double-terminal vinyl linear silicone oil A and the double-terminal vinyl linear silicone oil B are mixed evenly to obtain a vinyl silicone oil composition;

[0020] S2. The vinyl silicone oil composition obtained in step (1), hydrogen-containing silicone oil, thermal conductive filler, catalyst and inhibitor are uniformly mixed, cast and cured to obtain the silicone rubber composite material.

[0021] The preparation method of the silicone rubber composite material of the invention is simple and can be adapted to industrial production.

[0022] Preferably, in step S2, the curing temperature is 100°C-150°C, and the curing time is 10min-30min.

[0023] In a second aspect, the present invention provides application of the silicone rubber composite material in electronic components.

[0024] The silicone rubber composite material of the invention has excellent mechanical properties and thermal conductivity and can be widely used in electronic components.

[0025] The present invention has the following beneficial effects: the present invention uses two double-terminal vinyl linear silicone oils with large molecular weight differences to prepare a vinyl silicone oil composition composed of long molecular chains and short molecular chains, mixes the vinyl silicone oil with hydrogen-containing silicone oil, a catalyst, a thermal conductive filler, and an inhibitor, and forms an uneven cross-linked network structure after cross-linking, so that the silicone rubber composite material obtains excellent mechanical properties. In addition, the system can ensure that the composite material can be cast while increasing the filling amount of the thermal conductive filler, thereby obtaining an easy-to-cast, high-thermal-conductive silicone rubber composite material. DETAILED DESCRIPTION

[0026] To better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be understood by those skilled in the art that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Unless otherwise specified, the experimental methods used in the examples are all conventional methods; the materials, reagents, etc. used, unless otherwise specified, can be obtained from commercial channels.

[0028] In the following embodiments and comparative examples:

[0029] The molecular weight of the double-terminated vinyl linear silicone oil A1 is 500 g / mol;

[0030] The molecular weight of the double-terminated vinyl linear silicone oil A2 is 750 g / mol;

[0031] The molecular weight of the double-terminated vinyl linear silicone oil A3 is 2000 g / mol;

[0032] The molecular weight of the double-terminated vinyl linear silicone oil B1 is 8x10 4 g / mol;

[0033] The molecular weight of the double-terminated vinyl linear silicone oil B2 is 1x10 5 g / mol;

[0034] The molecular weight of the double-terminated vinyl linear silicone oil B3 is 1.5x10 5 g / mol;

[0035] The molecular weight of the double-terminated vinyl linear silicone oil C1 is 400 g / mol;

[0036] The molecular weight of the double-terminated vinyl linear silicone oil C2 is 2x10 4 g / mol;

[0037] The molecular weight of the single-terminated vinyl linear silicone oil D1 is 500 g / mol;

[0038] The molecular weight of the single-end vinyl linear silicone oil D2 is 8x10 4 g / mol;

[0039] The molecular weight of the side chain vinyl linear silicone oil E1 is 500 g / mol;

[0040] The molecular weight of the side chain vinyl linear silicone oil E2 is 8x10 4 g / mol;

[0041] The catalyst is a Custer catalyst, specifically a bis(1,3-divinyl-1,1,3,3-tetramethyldisiloxane) platinum catalyst as a catalyst;

[0042] The inhibitor is 3-methyl-hexynyl-3-ol;

[0043] The brand of the double-terminated vinyl linear silicone oil used in the examples and comparative examples is CX-352, the brand of the side-chain hydrogen-containing silicone oil is CX-351, and the brand of the side-chain hydrogen-containing silicone oil is CX-350T;

[0044] The parameters of the planetary mixer are: rotation speed 1000 rpm, vacuum degree 1 kPa, and mixing time 10 min.

[0045] Example 1

[0046] A method for preparing a silicone rubber composite material comprises the following steps:

[0047] S1. By a planetary stirrer, the double-terminal vinyl linear silicone oil B1 and the double-terminal vinyl linear silicone oil A1 were mixed in a mass ratio of 8:1 to obtain a vinyl silicone oil composition;

[0048] S2. 100 g of the vinyl silicone oil composition obtained in step (1), 7 g of end-chain hydrogenated silicone oil (hydrogen content of 1.0%), 50 g of boron nitride, 0.3 g of a catalyst, and 0.01 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the mixture was cured at 100° C. for 30 min to obtain the silicone rubber composite material.

[0049] Example 2

[0050] A method for preparing a silicone rubber composite material comprises the following steps:

[0051] S1. By a planetary stirrer, the double-terminated linear vinyl silicone oil B1 and the double-terminated linear vinyl silicone oil A3 were mixed in a mass ratio of 4:1 to obtain a vinyl silicone oil composition;

[0052] S2. 100 g of the vinyl silicone oil composition obtained in step (1), 7 g of end-chain hydrogenated silicone oil (hydrogen content of 1.0%), 50 g of boron nitride, 0.3 g of a catalyst, and 0.01 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the mixture was cured at 100° C. for 30 min to obtain the silicone rubber composite material.

[0053] Example 3

[0054] A method for preparing a silicone rubber composite material comprises the following steps:

[0055] S1. By a planetary stirrer, the double-terminal vinyl linear silicone oil B3 and the double-terminal vinyl linear silicone oil A2 were mixed in a mass ratio of 10:1 to obtain a vinyl silicone oil composition;

[0056] S2. 100 g of the vinyl silicone oil composition obtained in step (1), 10 g of side-chain hydrogenated silicone oil (hydrogen content of 0.5%), 100 g of aluminum oxide, 0.4 g of a catalyst, and 0.02 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the mixture was cured at 120° C. for 20 min to obtain the silicone rubber composite material.

[0057] Example 4

[0058] A method for preparing a silicone rubber composite material comprises the following steps:

[0059] S1. By a planetary stirrer, the double-terminal vinyl linear silicone oil B3 and the double-terminal vinyl linear silicone oil A3 were mixed in a mass ratio of 4:1 to obtain a vinyl silicone oil composition;

[0060] S2. 100 g of the vinyl silicone oil composition obtained in step (1), 10 g of side-chain hydrogenated silicone oil (hydrogen content of 0.5%), 100 g of aluminum oxide, 0.4 g of a catalyst, and 0.02 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the mixture was cured at 120° C. for 20 min to obtain the silicone rubber composite material.

[0061] Example 5

[0062] A method for preparing a silicone rubber composite material comprises the following steps:

[0063] S1. By a planetary stirrer, the double-terminal vinyl linear silicone oil B3 and the double-terminal vinyl linear silicone oil A3 were mixed in a mass ratio of 4:1 to obtain a vinyl silicone oil composition;

[0064] S2. 100 g of the vinyl silicone oil composition obtained in step (1), 10 g of side-chain hydrogenated silicone oil (hydrogen content of 0.5%), 100 g of zinc oxide, 0.4 g of a catalyst, and 0.02 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the mixture was cured at 120° C. for 20 min to obtain the silicone rubber composite material.

[0065] Example 6

[0066] A method for preparing a silicone rubber composite material comprises the following steps:

[0067] S1. By a planetary stirrer, the double-terminated linear vinyl silicone oil B2 and the double-terminated linear vinyl silicone oil A3 were mixed in a mass ratio of 5:1 to obtain a vinyl silicone oil composition;

[0068] S2. 100 g of the vinyl silicone oil composition obtained in step (1), 15 g of side-chain hydrogenated silicone oil (hydrogen content of 0.5%), 50 g of boron nitride, 0.5 g of a catalyst, and 0.04 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the mixture was cured at 150° C. for 10 min to obtain the silicone rubber composite material.

[0069] Example 7

[0070] A method for preparing a silicone rubber composite material comprises the following steps:

[0071] S1. By a planetary stirrer, the double-terminal vinyl linear silicone oil B1 and the double-terminal vinyl linear silicone oil A1 were mixed in a mass ratio of 5:1 to obtain a vinyl silicone oil composition;

[0072] S2. 100 g of the vinyl silicone oil composition obtained in step (1), 7 g of end-chain hydrogenated silicone oil (hydrogen content of 1.0%), 50 g of boron nitride, 0.3 g of a catalyst, and 0.01 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the mixture was cured at 100° C. for 30 min to obtain the silicone rubber composite material.

[0073] Example 8

[0074] A method for preparing a silicone rubber composite material comprises the following steps:

[0075] S1. By a planetary stirrer, the double-terminal vinyl linear silicone oil B1 and the double-terminal vinyl linear silicone oil A1 were mixed in a mass ratio of 4:1 to obtain a vinyl silicone oil composition;

[0076] S2. 100 g of the vinyl silicone oil composition obtained in step (1), 7 g of end-chain hydrogenated silicone oil (hydrogen content of 1.0%), 50 g of boron nitride, 0.3 g of a catalyst, and 0.01 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the mixture was cured at 100° C. for 30 min to obtain the silicone rubber composite material.

[0077] Example 9

[0078] A method for preparing a silicone rubber composite material comprises the following steps:

[0079] S1. By a planetary stirrer, the double-terminal vinyl linear silicone oil B1 and the double-terminal vinyl linear silicone oil A1 were mixed in a mass ratio of 10:1 to obtain a vinyl silicone oil composition;

[0080] S2. 100 g of the vinyl silicone oil composition obtained in step (1), 7 g of end-chain hydrogenated silicone oil (hydrogen content of 1.0%), 50 g of boron nitride, 0.3 g of a catalyst, and 0.01 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the mixture was cured at 100° C. for 30 min to obtain the silicone rubber composite material.

[0081] Comparative Example 1

[0082] A method for preparing a silicone rubber composite material comprises the following steps:

[0083] 100 g of double-terminal vinyl linear silicone oil A1, 7 g of end-side chain hydrogenated silicone oil (hydrogen content of 1.0%), 50 g of boron nitride, 0.3 g of catalyst and 0.01 g of inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the silicone rubber composite material was obtained by curing at 100° C. for 30 min.

[0084] Comparative Example 2

[0085] A method for preparing a silicone rubber composite material comprises the following steps:

[0086] 100 g of double-terminal vinyl linear silicone oil A3, 7 g of end-side chain hydrogenated silicone oil (hydrogen content of 1.0%), 50 g of boron nitride, 0.3 g of catalyst and 0.01 g of inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the silicone rubber composite material was obtained by curing at 100° C. for 30 min.

[0087] Comparative Example 3

[0088] A method for preparing a silicone rubber composite material comprises the following steps:

[0089] 100 g of double-terminal vinyl linear silicone oil B1, 7 g of end-side chain hydrogenated silicone oil (hydrogen content of 1.0%), 50 g of boron nitride, 0.3 g of catalyst and 0.01 g of inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the silicone rubber composite material was obtained by curing at 100° C. for 30 min.

[0090] Comparative Example 4

[0091] A method for preparing a silicone rubber composite material comprises the following steps:

[0092] S1. By a planetary stirrer, the double-terminated linear vinyl silicone oil C2 and the double-terminated linear vinyl silicone oil C1 were mixed in a mass ratio of 8:1 to obtain a vinyl silicone oil composition;

[0093] S2. 100 g of the vinyl silicone oil composition obtained in step (1), 7 g of end-chain hydrogenated silicone oil (hydrogen content of 1.0%), 50 g of boron nitride, 0.3 g of a catalyst, and 0.01 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the mixture was cured at 100° C. for 30 min to obtain the silicone rubber composite material.

[0094] Comparative Example 5

[0095] A method for preparing a silicone rubber composite material comprises the following steps:

[0096] S1. By a planetary stirrer, the single-ended vinyl linear silicone oil D2 and the single-ended vinyl linear silicone oil D1 were mixed in a mass ratio of 8:1 to obtain a vinyl silicone oil composition;

[0097] S2. 100 g of the vinyl silicone oil composition obtained in step (1), 7 g of end-chain hydrogenated silicone oil (hydrogen content of 1.0%), 50 g of boron nitride, 0.3 g of a catalyst, and 0.01 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the mixture was cured at 100° C. for 30 min. After being cured at 100° C. for 30 min, the composition was still in liquid state and could not be cross-linked to form an elastomer.

[0098] Comparative Example 6

[0099] A method for preparing a silicone rubber composite material comprises the following steps:

[0100] S1. By a planetary stirrer, the side chain vinyl linear silicone oil E2 and the side chain vinyl linear silicone oil E1 were mixed in a mass ratio of 8:1 to obtain a vinyl silicone oil composition;

[0101] S2. 100 g of the vinyl silicone oil composition obtained in step (1), 7 g of end-chain hydrogenated silicone oil (hydrogen content of 1.0%), 50 g of boron nitride, 0.3 g of a catalyst, and 0.01 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the mixture was cured at 100° C. for 30 min to obtain the silicone rubber composite material.

[0102] Comparative Example 7

[0103] A method for preparing a silicone rubber composite material comprises the following steps:

[0104] 100 g of double-terminal vinyl linear silicone oil A2, 10 g of side-chain hydrogenated silicone oil (hydrogen content of 0.5%), 100 g of aluminum oxide, 0.4 g of a catalyst, and 0.02 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the silicone rubber composite material was obtained by curing at 120° C. for 20 min.

[0105] Comparative Example 8

[0106] A method for preparing a silicone rubber composite material comprises the following steps:

[0107] 100 g of double-terminal vinyl linear silicone oil A3, 10 g of side-chain hydrogenated silicone oil (hydrogen content of 0.5%), 100 g of aluminum oxide, 0.4 g of a catalyst, and 0.02 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the silicone rubber composite material was obtained by curing at 120° C. for 20 min.

[0108] Comparative Example 9

[0109] A method for preparing a silicone rubber composite material comprises the following steps:

[0110] 100 g of double-terminal vinyl linear silicone oil B3, 10 g of side-chain hydrogenated silicone oil (hydrogen content of 0.5%), 100 g of aluminum oxide, 0.4 g of catalyst, and 0.02 g of inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; the composition had too high a viscosity to be cast.

[0111] Comparative Example 10

[0112] A method for preparing a silicone rubber composite material comprises the following steps:

[0113] S1. By a planetary stirrer, the double-terminal vinyl linear silicone oil B3 and the double-terminal vinyl linear silicone oil A2 were mixed in a mass ratio of 10:1 to obtain a vinyl silicone oil composition;

[0114] S2. 100 g of the vinyl silicone oil composition obtained in step (1), 10 g of double-ended hydrogenated silicone oil (hydrogen content of 0.5%), 100 g of aluminum oxide, 0.4 g of a catalyst, and 0.02 g of an inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; the composition was still liquid after being cured at 120°C for 20 minutes and could not be cross-linked to form an elastomer.

[0115] Comparative Example 11

[0116] A method for preparing a silicone rubber composite material comprises the following steps:

[0117] 100 g of double-terminal vinyl linear silicone oil A3, 15 g of side-chain hydrogenated silicone oil (hydrogen content of 0.5%), 50 g of boron nitride, 0.5 g of catalyst and 0.04 g of inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the silicone rubber composite material was obtained by curing at 150° C. for 10 min.

[0118] Comparative Example 12

[0119] A method for preparing a silicone rubber composite material comprises the following steps:

[0120] 100 g of double-terminal vinyl linear silicone oil B2, 15 g of side-chain hydrogenated silicone oil (hydrogen content of 0.5%), 50 g of boron nitride, 0.5 g of catalyst and 0.04 g of inhibitor were mixed by a planetary stirrer to obtain a silicone rubber composition; finally, the silicone rubber composite material was obtained by curing at 150° C. for 10 min.

[0121] The silicone rubber composite materials of the embodiment and the comparative example were subjected to performance tests, and the test results are shown in Tables 1 and 2, wherein the thermal conductivity was measured in accordance with GB / T 11205-2009; the tensile strength and elongation at break were measured in accordance with ISO37-2005, the test temperature was room temperature, and the tensile rate was 500 mm / min; the viscosity was measured in accordance with GB / T 22235-2008, and the measurement was performed using a rotational viscometer method.

[0122] Table 1 Performance test results of the silicone rubber composite materials of Examples 1-9

[0123]

[0124] Table 2 Performance test results of silicone rubber composite materials of comparative examples 1-12

[0125]

[0126] As shown in Table 1 and Table 2, according to Comparative Example 1, Comparative Example 3, Example 1, Example 7, Example 8 and Example 9, the silicone rubber composite material prepared by combining double-terminal vinyl linear silicone oil B1 and A1 in a certain mass ratio can maintain good fluidity and thermal conductivity while having excellent mechanical properties; among them, the performance of the silicone rubber composite material when the mass ratio of double-terminal vinyl linear silicone oil B1 and A1 is 8:1 and 5:1 is better than that of B1 and A1 in a mass ratio of 10:1 and 4:1.

[0127] According to Comparative Example 4 and Example 1, when the molecular weight of the double-terminal vinyl linear silicone oil is within a certain range, the silicone rubber composite material prepared by compounding the vinyl silicone oil has better fluidity, thermal conductivity and mechanical properties.

[0128] According to Comparative Examples 5, 6 and Example 1, the single-end vinyl linear silicone oil used in Comparative Example 5 is still liquid after curing at 100°C for 30 minutes and cannot be cross-linked and formed; the silicone rubber composite material prepared by Comparative Example 6 using side-chain vinyl linear silicone oil has a large cross-linking density, resulting in a decrease in mechanical properties; the silicone rubber composite material prepared in Example 1 can maintain good fluidity and thermal conductivity while having excellent mechanical properties.

[0129] According to Comparative Example 2, Comparative Example 3 and Example 2, the silicone rubber composite material prepared by combining double-terminated vinyl linear silicone oil B1 and A3 in a mass ratio of 4:1 can maintain good fluidity and thermal conductivity while having excellent mechanical properties.

[0130] According to Comparative Examples 7, 9, 10 and Example 3, the silicone rubber composition of Comparative Example 9 cannot be cast, and the use of double-ended hydrogenated silicone oil in Comparative Example 10 cannot form a cross-linked structure in the silicone rubber composition, and it is still liquid after curing at 120°C for 20 minutes; while the silicone rubber composite material prepared by combining double-ended vinyl linear silicone oil B3 and A2 in a mass ratio of 10:1 in Example 3 can maintain good fluidity and thermal conductivity while having excellent mechanical properties.

[0131] According to Comparative Example 8, Comparative Example 9, Example 4 and Example 5, the silicone rubber composition of Comparative Example 9 cannot be cast, while the silicone rubber composite material prepared by combining double-terminal vinyl linear silicone oil B3 and A3 in a mass ratio of 4:1 in Example 4 can maintain good fluidity and thermal conductivity while having excellent mechanical properties; the silicone rubber composite material prepared in Example 5 also has good fluidity, thermal conductivity and mechanical properties.

[0132] According to Comparative Example 11, Comparative Example 12 and Example 6, the silicone rubber composite material prepared by combining double-terminated vinyl linear silicone oil B2 and A3 in a mass ratio of 5:1 can maintain good fluidity and thermal conductivity while having excellent mechanical properties.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A silicone rubber composite material, characterized in that: The invention comprises the following components by weight: 90-100 parts of a vinyl silicone oil composition, 7-15 parts of a hydrogenated silicone oil, 50-100 parts of a thermally conductive filler, 0.3-0.5 parts of a catalyst and 0.01-0.04 parts of an inhibitor; the vinyl silicone oil composition comprises a double-ended vinyl linear silicone oil A and a double-ended vinyl linear silicone oil B, the molecular weight of the double-ended vinyl linear silicone oil A is 500 g / mol-2000 g / mol, and the molecular weight of the double-ended vinyl linear silicone oil B is 80000 g / mol-150000 g / mol.

2. The silicone rubber composite material according to claim 1, characterized in that: In the vinyl silicone oil composition, the mass ratio of the dual-terminal vinyl linear silicone oil B to the dual-terminal vinyl linear silicone oil A is 4:1-10:

1.

3. The silicone rubber composite material according to claim 2, characterized in that: In the vinyl silicone oil composition, the mass ratio of the dual-terminal vinyl linear silicone oil B to the dual-terminal vinyl linear silicone oil A is 5:1-8:

1.

4. The silicone rubber composite material according to claim 1, characterized in that: The hydrogen-containing silicone oil includes at least one of a side chain hydrogen-containing silicone oil and a terminal side chain hydrogen-containing silicone oil.

5. The silicone rubber composite material according to claim 1, characterized in that: The hydrogen content in the hydrogen-containing silicone oil is 0.5%-1%.

6. The silicone rubber composite material according to claim 1, characterized in that: The thermally conductive filler includes at least one of boron nitride, aluminum oxide, and zinc oxide.

7. The silicone rubber composite material according to claim 1, characterized in that: The catalyst includes a Custer catalyst.

8. The silicone rubber composite material according to claim 1, characterized in that: The inhibitors include acetylenic alcohol inhibitors.

9. The method for preparing the silicone rubber composite material according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. The double-terminal vinyl linear silicone oil A and the double-terminal vinyl linear silicone oil B are mixed evenly to obtain a vinyl silicone oil composition; S2. The vinyl silicone oil composition obtained in step (1), hydrogen-containing silicone oil, thermal conductive filler, catalyst and inhibitor are uniformly mixed, cast and cured to obtain the silicone rubber composite material.

10. Use of the silicone rubber composite material according to any one of claims 1 to 8 in electronic components.

Images