阅读说明：本技术 一种耐热型硅橡胶组合物及其制备方法 (Heat-resistant silicone rubber composition and preparation method thereof ) 是由 周宏伟 任炼军 石磊 姚金忠 于 2020-04-29 设计创作，主要内容包括：本发明公开了一种耐热型硅橡胶组合物及其制备方法,其中的硅橡胶组合物包括以下重量份的原料：乙烯基硅橡胶45～55份、硅烷偶联剂0.5～1.5份、含氢硅油3～6份、乙烯基硅油80～85份、硫化剂2.5～6.5份、白炭黑28～35份、发泡剂0.4～0.8份、六甲基二硅氮烷8～9份、硅橡胶17～20份、碳纤维23～25份和助剂4～12份；其制备方法包括以下步骤：S1：备料；S2：预破碎处理；S3：基材混合；S4：二次混合。S5：加入助剂；S6：成型。本发明设计依靠乙烯基硅橡胶和硅橡胶为主要原材料,便可制造出耐热性能好的硅橡胶组合物,极大的降低了生产成本,缩减生产工艺步骤,适用于企业的快捷生产工作。(The invention discloses a heat-resistant silicone rubber composition and a preparation method thereof, wherein the silicone rubber composition comprises the following raw materials in parts by weight: 45-55 parts of vinyl silicone rubber, 0.5-1.5 parts of silane coupling agent, 3-6 parts of hydrogen-containing silicone oil, 80-85 parts of vinyl silicone oil, 2.5-6.5 parts of vulcanizing agent, 28-35 parts of white carbon black, 0.4-0.8 part of foaming agent, 8-9 parts of hexamethyldisilazane, 17-20 parts of silicone rubber, 23-25 parts of carbon fiber and 4-12 parts of auxiliary agent; the preparation method comprises the following steps: s1: preparing materials; s2: pre-crushing treatment; s3: mixing base materials; s4: and (5) mixing for the second time. S5: adding an auxiliary agent; s6: and (5) molding. The invention can manufacture the silicon rubber composition with good heat resistance by using the vinyl silicon rubber and the silicon rubber as main raw materials, greatly reduces the production cost, reduces the production process steps, and is suitable for quick production work of enterprises.)

1. A heat-resistant silicone rubber composition is characterized by comprising the following raw materials in parts by weight: 45-55 parts of vinyl silicone rubber, 0.5-1.5 parts of silane coupling agent, 3-6 parts of hydrogen-containing silicone oil, 80-85 parts of vinyl silicone oil, 2.5-6.5 parts of vulcanizing agent, 28-35 parts of white carbon black, 0.4-0.8 part of foaming agent, 8-9 parts of hexamethyldisilazane, 17-20 parts of silicone rubber, 23-25 parts of carbon fiber and 4-12 parts of auxiliary agent.

2. The heat-resistant silicone rubber composition and the preparation method thereof according to claim 1, characterized by comprising the following raw materials in parts by weight: 48-52 parts of vinyl silicone rubber, 0.7-1.3 parts of silane coupling agent, 4-5 parts of hydrogen-containing silicone oil, 82-84 parts of vinyl silicone oil, 3.5-5.5 parts of vulcanizing agent, 31-33 parts of white carbon black, 0.5-0.7 part of foaming agent, 8.3-8.7 parts of hexamethyldisilazane, 18-19 parts of silicone rubber, 23.5-24.5 parts of carbon fiber and 6-10 parts of auxiliary agent.

3. The heat-resistant silicone rubber composition and the preparation method thereof according to claim 1, characterized by comprising the following raw materials in parts by weight: 50 parts of vinyl silicone rubber, 1.1 parts of silane coupling agent, 4.5 parts of hydrogen-containing silicone oil, 83 parts of vinyl silicone oil, 4 parts of vulcanizing agent, 32 parts of white carbon black, 0.6 part of foaming agent, 8.5 parts of hexamethyldisilazane, 18.5 parts of silicone rubber, 24 parts of carbon fiber and 8 parts of auxiliary agent.

4. A preparation method of a heat-resistant silicone rubber composition is characterized by comprising the following steps:

s1: preparing materials: selecting a precision electronic balance, sequentially weighing raw materials of vinyl silicone rubber, a silane coupling agent, hydrogen-containing silicone oil, vinyl silicone oil, a vulcanizing agent, white carbon black, a foaming agent, hexamethyldisilazane, silicone rubber, carbon fiber and an auxiliary agent, and placing the weighed raw materials in a container for later use;

s2: pre-crushing treatment: putting the white carbon black, hexamethyldisilazane and silicon rubber weighed in the S1 into a crusher to be crushed to obtain crushed materials for later use;

s3: mixing base materials: pouring the vinyl silicone rubber, the hydrogen-containing silicone oil and the vinyl silicone oil weighed in the step S1 into a mixing container for mixing, and after mixing is finished, putting the vulcanizing agent weighed in the step S1 into the mixing container for mixing to obtain a stock solution for later use;

s4: and (3) secondary mixing: and (3) putting the crushed aggregates in the S2 into the stock solution in the S3 for mixing treatment, and then putting the weighed silane coupling agent, the carbon fibers and the foaming agent in the S1 into a container for mixing to obtain a blank.

S5: adding an auxiliary agent: putting the vulcanizing agent and the auxiliary agent weighed in the S1 into the blank material in the S4, and uniformly stirring to obtain a semi-finished product;

s6: molding: and (4) putting the semi-finished product in the S5 into a vacuum kneader for mixing and molding to obtain a finished silicone rubber composition product.

5. The method for producing a heat-resistant silicone rubber composition according to claim 4, wherein in S1, an electronic balance with an accuracy of 0.001 g is selected for the weighing operation.

6. The method of producing a heat-resistant silicone rubber composition according to claim 4, wherein in S2, the widest dimension of the crushed aggregates is not greater than 0.12 mm.

7. The method for preparing a heat-resistant silicone rubber composition according to claim 4, wherein in S3, the stirring speed of the stock solution is 120-140 rpm, and the stirring time is 15-20 minutes.

8. The method for preparing a heat-resistant silicone rubber composition according to claim 4, wherein in S4, the stirring speed of the blank is 140-180 rpm, and the stirring time is 10-15 minutes.

Technical Field

The invention relates to the technical field of organic silicon high polymer materials, in particular to a heat-resistant silicone rubber composition and a preparation method thereof.

Background

The silicon rubber has excellent high and low temperature resistance, ozone aging resistance and electrical insulation, and is widely applied to the fields of aerospace, nuclear power industry, electronic and electrical appliances and the like with higher requirements on thermal oxidation aging resistance as pouring sealant, sealing ring, heat insulation coating and the like. Through retrieval, Chinese patent with application number 201711147056.X discloses a high-transparency thermo-oxidative aging-resistant addition type liquid silicone rubber and a preparation method thereof, wherein the high-transparency thermo-oxidative aging-resistant addition type liquid silicone rubber comprises, by mass, 100 parts of vinyl silicone oil, 30-50 parts of white carbon black, 5-7 parts of hexamethyldisilazane, 1-5 parts of hydrogen-containing silicone oil, 1-5 parts of metal hybrid cage type silsesquioxane, 5-20 ppm of platinum catalyst and 0.03-0.07 part of 1-ethynyl-1-cyclohexanol. Carrying out high-temperature mixing on vinyl silicone oil, white carbon black and hexamethyldisilazane by a vacuum kneader, cooling, and grinding by a three-roll grinder to obtain a master batch; and then adding the metal hybrid cage type silsesquioxane, hydrogen-containing silicone oil, 1-ethynyl-1-cyclohexanol, platinum catalyst and the like into the master batch, and mechanically mixing and vulcanizing to obtain the silicone rubber. The silicon rubber prepared by the design has excellent thermal-oxidative aging resistance, high transparency and good mechanical property, and can be applied to the fields of aerospace, nuclear power industry, electronic appliances, medical appliances and the like.

However, the existing heat-resistant silicone rubber products rely too much on high-quality raw materials to ensure that the products have enough heat-resistant effect, so that the production cost of the products is greatly increased, and the products are not suitable for popularization and use.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a heat-resistant silicone rubber composition and a preparation method thereof.

The invention provides a heat-resistant silicone rubber composition which comprises the following raw materials in parts by weight: 45-55 parts of vinyl silicone rubber, 0.5-1.5 parts of silane coupling agent, 3-6 parts of hydrogen-containing silicone oil, 80-85 parts of vinyl silicone oil, 2.5-6.5 parts of vulcanizing agent, 28-35 parts of white carbon black, 0.4-0.8 part of foaming agent, 8-9 parts of hexamethyldisilazane, 17-20 parts of silicone rubber, 23-25 parts of carbon fiber and 4-12 parts of auxiliary agent.

Preferably, the feed comprises the following raw materials in parts by weight: 48-52 parts of vinyl silicone rubber, 0.7-1.3 parts of silane coupling agent, 4-5 parts of hydrogen-containing silicone oil, 82-84 parts of vinyl silicone oil, 3.5-5.5 parts of vulcanizing agent, 31-33 parts of white carbon black, 0.5-0.7 part of foaming agent, 8.3-8.7 parts of hexamethyldisilazane, 18-19 parts of silicone rubber, 23.5-24.5 parts of carbon fiber and 6-10 parts of auxiliary agent.

Preferably, the feed comprises the following raw materials in parts by weight: 50 parts of vinyl silicone rubber, 1.1 parts of silane coupling agent, 4.5 parts of hydrogen-containing silicone oil, 83 parts of vinyl silicone oil, 4 parts of vulcanizing agent, 32 parts of white carbon black, 0.6 part of foaming agent, 8.5 parts of hexamethyldisilazane, 18.5 parts of silicone rubber, 24 parts of carbon fiber and 8 parts of auxiliary agent.

The invention also provides a preparation method of the heat-resistant silicone rubber composition, which comprises the following steps:

s1: preparing materials: selecting a precision electronic balance, sequentially weighing raw materials of vinyl silicone rubber, a silane coupling agent, hydrogen-containing silicone oil, vinyl silicone oil, a vulcanizing agent, white carbon black, a foaming agent, hexamethyldisilazane, silicone rubber, carbon fiber and an auxiliary agent, and placing the weighed raw materials in a container for later use;

s2: pre-crushing treatment: putting the white carbon black, hexamethyldisilazane and silicon rubber weighed in the S1 into a crusher to be crushed to obtain crushed materials for later use;

s3: mixing base materials: pouring the vinyl silicone rubber, the hydrogen-containing silicone oil and the vinyl silicone oil weighed in the step S1 into a mixing container for mixing, and after mixing is finished, putting the vulcanizing agent weighed in the step S1 into the mixing container for mixing to obtain a stock solution for later use;

s4: and (3) secondary mixing: and (3) putting the crushed aggregates in the S2 into the stock solution in the S3 for mixing treatment, and then putting the weighed silane coupling agent, the carbon fibers and the foaming agent in the S1 into a container for mixing to obtain a blank.

S5: adding an auxiliary agent: putting the vulcanizing agent and the auxiliary agent weighed in the S1 into the blank material in the S4, and uniformly stirring to obtain a semi-finished product;

s6: molding: and (4) putting the semi-finished product in the S5 into a vacuum kneader for mixing and molding to obtain a finished silicone rubber composition product.

Preferably, in S1, an electronic balance with an accuracy of 0.001 g is selected for the weighing operation.

Preferably, in S2, the widest dimension of the small pieces is not greater than 0.12 mm.

Preferably, in the step S3, the stirring speed of the stock solution is 120-140 rpm, and the stirring time is 15-20 minutes.

Preferably, in the step S4, the stirring speed of the blank is 140 to 180 rpm, and the stirring time is 10 to 15 minutes.

The invention can manufacture the silicon rubber composition with good heat resistance by using the vinyl silicon rubber and the silicon rubber as main raw materials, greatly reduces the production cost, reduces the production process steps, and is suitable for quick production work of enterprises.

Detailed Description

The present invention will be further illustrated with reference to the following specific examples.