阅读说明：本技术 一种加成型液体硅橡胶及其制备方法和应用 (Addition type liquid silicone rubber and preparation method and application thereof ) 是由 张启发 宁颖 辛志勇 于 2021-08-18 设计创作，主要内容包括：本申请属于硅橡胶技术领域,尤其涉及一种加成型液体硅橡胶及其制备方法和应用。本申请第一方面提供了一种加成型液体硅橡胶,包括：第一混合物和第二混合物；所述第一混合物的制备方法包括：步骤1、将原料混合进行热处理,制得基胶；其中,所述原料包括端乙烯基硅油、白炭黑、处理剂和水；步骤2、将所述基胶、甲基封端乙烯硅油、端乙烯基硅油和铂金催化剂混合,制得第一混合物；所述第二混合物的制备方法包括：将所述基胶、甲基封端乙烯硅油、含氢硅油、端乙烯基硅油和抑制剂混合,制得第二混合物。本申请提供了一种加成型液体硅橡胶及其制备方法,能有效解决现有硅橡胶材料粘度高导致的容易产生气泡,以及容易出油的技术问题。(The application belongs to the technical field of silicone rubber, and particularly relates to addition type liquid silicone rubber as well as a preparation method and application thereof. The present application provides, in a first aspect, an addition type liquid silicone rubber comprising: a first mixture and a second mixture; the preparation method of the first mixture comprises the following steps: step 1, mixing raw materials and carrying out heat treatment to prepare base rubber; wherein the raw materials comprise vinyl-terminated silicone oil, white carbon black, a treating agent and water; step 2, mixing the base rubber, the methyl-terminated vinyl silicone oil, the terminated vinyl silicone oil and a platinum catalyst to prepare a first mixture; the preparation method of the second mixture comprises the following steps: and mixing the base rubber, the methyl-terminated vinyl silicone oil, the hydrogen-containing silicone oil, the vinyl-terminated silicone oil and the inhibitor to prepare a second mixture. The application provides addition type liquid silicone rubber and a preparation method thereof, which can effectively solve the technical problems of easy bubble generation and easy oil discharge caused by high viscosity of the existing silicone rubber material.)

1. An addition type liquid silicone rubber, characterized by comprising: a first mixture and a second mixture; the preparation method of the first mixture comprises the following steps:

step 1, mixing raw materials and carrying out heat treatment to prepare base rubber; wherein the raw materials comprise vinyl-terminated silicone oil, white carbon black, a treating agent and water;

step 2, mixing the base rubber, the methyl-terminated vinyl silicone oil, the terminated vinyl silicone oil and a platinum catalyst to prepare a first mixture;

the preparation method of the second mixture comprises the following steps:

and mixing the base rubber, the methyl-terminated vinyl silicone oil, the hydrogen-containing silicone oil, the vinyl-terminated silicone oil and the inhibitor to prepare a second mixture.

2. The addition type liquid silicone rubber according to claim 1, wherein the viscosity of the terminal vinyl silicone oil is in the range of 200-5000 mpa.s; the mass percentage of the vinyl-terminated silicone oil is 0.1-1%.

3. The addition type liquid silicone rubber according to claim 2, wherein the terminal vinyl silicone oil is selected from terminal vinyl polydimethylsiloxane or/and terminal vinyl side chain vinyl polydimethylsiloxane.

4. The addition type liquid silicone rubber according to claim 1, wherein in step 2, the viscosity of the methyl terminated ethylene silicone oil ranges from 20 mpa.s to 500mpa.s, and the mass percentage of the vinyl group in the methyl terminated ethylene silicone oil ranges from 0.1% to 1%.

5. The addition type liquid silicone rubber according to claim 4, wherein the methyl-terminated vinyl silicone oil is prepared by a method comprising: mixing a capping agent, a chain extender and an alkaline catalyst, reacting under a heating condition, and removing low-molecular impurities in vacuum to prepare methyl capped vinyl silicone oil; the end-capping agent is hexamethyldisiloxane, and the chain extender is octamethylcyclotetrasiloxane or/and tetramethyltetravinyl cyclosiloxane.

6. The addition type liquid silicone rubber according to claim 1, wherein in step 2, the hydrogen-containing silicone oil comprises terminal hydrogen-containing silicone oil or/and side hydrogen-containing silicone oil; the hydrogen-containing silicone oil contains 0.02-1% of hydrogen by mass, and the viscosity of the hydrogen-containing silicone oil is 5-500 mpa.s.

7. The addition type liquid silicone rubber according to claim 1, wherein in step 1, the treating agent is selected from one or more of hexamethyldisilazane, vinyl silazane, dimethyldimethoxysilane, dimethyldiethoxysilane, hexamethyldisiloxane, vinyltrimethylsilane, vinyltriethoxysilane; in the step 2, the platinum catalyst is a complex of chloroplatinic acid and divinyl tetramethyl disiloxane, and the platinum content of the platinum catalyst is 500-10000 ppm; the inhibitor is selected from one or more of ethynyl-1-cyclohexanol, 2-methyl-3-butyn-2-ol and tetramethyltetravinylcyclosiloxane.

8. A method for preparing the addition type liquid silicone rubber according to any one of claims 1 to 7, wherein the method for preparing the first mixture comprises:

step 1, mixing raw materials and carrying out heat treatment to prepare base rubber; wherein the raw materials comprise vinyl-terminated silicone oil, white carbon black, a treating agent and water;

step 2, mixing the base rubber, the methyl-terminated vinyl silicone oil, the terminated vinyl silicone oil and a platinum catalyst to prepare a first mixture;

the preparation method of the second mixture comprises the following steps:

and mixing the base rubber, the methyl-terminated vinyl silicone oil, the hydrogen-containing silicone oil, the vinyl-terminated silicone oil and the inhibitor to prepare a second mixture.

9. Use of the addition type liquid silicone rubber of any one of claims 1 to 8 in silicone rubber products; the silicon rubber product comprises one or more of adult products, emulational persons, medical manikins, insoles or food-grade mold rubber.

10. The use of claim 9, wherein the first mixture and the second mixture are mixed, cured and shaped to produce a product; the mass ratio of the first mixture to the second mixture is (1-100): 1-100; the temperature of the curing molding is between room temperature and 150 ℃, and the time of the curing molding is 5-600 min.

Technical Field

The application belongs to the technical field of silicone rubber, and particularly relates to addition type liquid silicone rubber as well as a preparation method and application thereof.

Background

With the improvement of living standard of people, the quality requirement on life is higher and higher. In view of safety and environmental protection, traditional adult products, emulators and other products are made of PVC materials, and in recent years, silicone rubber materials have been used for replacing production. The silicon rubber material has good biocompatibility with human bodies, and does not generate anaphylactic reaction after contacting with the human bodies.

At present, silicon rubber material products have two forming modes, one is casting forming and the other is liquid injection forming. The casting molding is common, and the casting molded product has higher requirements on the silicon rubber material. The lower the viscosity of the liquid silicone rubber material is, the better the viscosity is, the lower the viscosity is, the foam discharge in the production process is facilitated, otherwise, the foam generated by the liquid silicone rubber material is waste; the physical properties of the liquid silicon rubber are ensured, and the products are repeatedly used, like insoles which can be used for a long time; since the low viscosity requires the addition of low viscosity silicone oil, this can result in the appearance of the product after a period of time, which can affect both use and appearance.

Disclosure of Invention

In view of the above, the application provides an addition type liquid silicone rubber, and a preparation method and an application thereof, which can effectively solve the technical problems that the existing silicone rubber material is easy to generate bubbles and oil easily generates due to high viscosity.

The present application provides, in a first aspect, an addition type liquid silicone rubber comprising: a first mixture and a second mixture;

the preparation method of the first mixture comprises the following steps:

step 1, mixing raw materials and carrying out heat treatment to prepare base rubber; wherein the raw materials comprise vinyl-terminated silicone oil, white carbon black, a treating agent and water;

step 2, mixing the base rubber, the methyl-terminated vinyl silicone oil, the terminated vinyl silicone oil and a platinum catalyst to prepare a first mixture;

the preparation method of the second mixture comprises the following steps:

and mixing the base rubber, the methyl-terminated vinyl silicone oil, the hydrogen-containing silicone oil, the vinyl-terminated silicone oil and the inhibitor to prepare a second mixture.

In another embodiment, in step 1, the heat treatment is vacuum heat treatment, and the temperature of the heat treatment is 150-210 ℃; the time of the heat treatment is 2-6 h.

In another embodiment, step 1 further comprises: and grinding the discharged base rubber.

In another embodiment, the viscosity range of the vinyl-terminated silicone oil is 200-5000 mpa.s; the mass percentage of the vinyl-terminated silicone oil is 0.1-1%.

In another embodiment, the vinyl-terminated silicone oil is selected from vinyl-terminated polydimethylsiloxanes or/and vinyl-terminated pendant vinyl polydimethylsiloxanes.

In another embodiment, the vinyl-terminated silicone oil is selected from vinyl-terminated polydimethylsiloxanes.

In another embodiment, the viscosity of the methyl terminated vinyl silicone oil ranges from 20 mpa.s to 500mpa.s, and the mass percentage of the vinyl group of the methyl terminated vinyl silicone oil ranges from 0.1% to 1%.

In another embodiment, the preparation method of the methyl-terminated vinyl silicone oil comprises the following steps: mixing a capping agent, a chain extender and an alkaline catalyst, reacting under a heating condition, and removing low-molecular impurities in vacuum to prepare methyl capped vinyl silicone oil; the end-capping agent is hexamethyldisiloxane; the chain extender is octamethylcyclotetrasiloxane or/and tetramethyl tetravinyl cyclosiloxane.

Specifically, the heating reaction condition is that the reaction is carried out for 4 hours at 100 ℃.

In another embodiment, the hydrogen-containing silicone oil comprises terminal hydrogen-containing silicone oil or/and side hydrogen-containing silicone oil; the hydrogen-containing silicone oil contains hydrogen in 0.02-1 wt%, and has viscosity of 5-500 mpa.s.

Specifically, the chain extender is octamethylcyclotetrasiloxane.

Specifically, the preparation method of the hydrogen-terminated silicone oil comprises the following steps: mixing an end capping agent, a chain extender and an acid catalyst, and carrying out heating reaction to prepare hydrogen-terminated silicone oil; the end-capping agent is tetramethyldisiloxane; the chain extender is selected from one or more of octamethylcyclotetrasiloxane, tetramethylcyclosiloxane and methyl-terminated side chain hydrogen-containing silicone oil (hydrogen content is 1.6%); the acidic catalyst is a type-selection cation exchange resin catalyst; the heating reaction condition is 60-90 ℃ for 6 h.

In another embodiment, in step 1, the raw material further comprises a coupling agent, wherein the coupling agent is one or more selected from the group consisting of dimethyldimethoxysilane, dimethyldiethoxysilane, hexamethyldisiloxane, vinyltrimethylsilane and vinyltriethoxysilane; the treating agent is selected from one or more of hexamethyldisilazane, vinyl silazane, dimethyl dimethoxy silane, dimethyl diethoxy silane, hexamethyldisiloxane, vinyl trimethylsilane and vinyl triethoxysilane.

In another embodiment, in step 2, the platinum catalyst is a complex of chloroplatinic acid and divinyltetramethyldisiloxane, and the platinum content of the platinum catalyst is 500-10000 ppm; the inhibitor is selected from one or more of ethynyl-1-cyclohexanol, 2-methyl-3-butyn-2-ol and tetramethyltetravinylcyclosiloxane.

The second aspect of the present application provides a method for preparing the addition type liquid silicone rubber, the method for preparing the first mixture comprising:

step 1, mixing raw materials and carrying out heat treatment to prepare base rubber; wherein the raw materials comprise vinyl-terminated silicone oil, white carbon black, a treating agent and water;

step 2, mixing the base rubber, the methyl-terminated vinyl silicone oil, the terminated vinyl silicone oil and a platinum catalyst to prepare a first mixture;

the preparation method of the second mixture comprises the following steps:

and mixing the base rubber, the methyl-terminated vinyl silicone oil, the hydrogen-containing silicone oil, the vinyl-terminated silicone oil and the inhibitor to prepare a second mixture.

The third aspect of the application provides the application of the addition type liquid silicone rubber in silicone rubber products; the silicon rubber product comprises one or more of adult products, emulational persons, medical manikins, insoles or food-grade mold rubber.

In another embodiment, the first mixture and the second mixture are mixed, cured and molded to obtain a product; the mass ratio of the first mixture to the second mixture is (1-100): 1-100; the temperature of the curing molding is between room temperature and 150 ℃, and the time of the curing molding is 5-600 min.

Specifically, the mass ratio of the first mixture to the second mixture is adjusted according to actual product requirements, and the curing molding time is mild.

In another embodiment, in step 3, the mass ratio of the first mixture to the second mixture is 1: 1.

In another embodiment, in the step 3, the temperature of the curing molding is 130 ℃ to 150 ℃, and the time of the curing molding is 5 min to 360 min.

Specifically, the molding method may be: and mixing the first mixture and the second mixture, defoaming in vacuum, pouring into a mold or injecting into the mold by using an injection machine, and performing high-temperature thermosetting to obtain the addition type liquid silicone rubber with no shape or a specific shape.

Specifically, in the step 1, the white carbon black is added and mixed with the vinyl-terminated silicone oil and the silazane treating agent for 1-4 times; and the vinyl-terminated silicone oil and the silazane treating agent are mixed and added at one time.

In another embodiment, in step 1 of the method for preparing the first mixture, in terms of parts by mass,

in another embodiment, in step 2 of the method for preparing the first mixture, in terms of parts by mass,

in another embodiment, in step 3 of the method for preparing the second mixture, in terms of parts by mass,

the purpose of the application is to overcome the defects that in the prior art, the silicone rubber material is easy to generate bubbles due to high viscosity and is easy to produce oil. The application provides addition type liquid silicone rubber and a preparation method thereof, and the low-viscosity terminal vinyl silicone oil and the low-viscosity methyl terminal vinyl silicone oil are adopted, so that the viscosity of the liquid silicone rubber is reduced. Compared with the prior art, the physical property is improved through compounding of various silane coupling agents, and the viscosity can be reduced and the oil yielding of liquid silicone rubber products can also be prevented through adding proper methyl-terminated ethylene silicone oil and hydrogen-containing silicone oil. According to experimental data of the application, the viscosity of the addition type liquid silicone rubber can be effectively reduced by adopting the silicone oil with proper hydrogen content and viscosity, and the oil outlet condition of the addition type liquid silicone rubber can be effectively solved.

Detailed Description

The application provides addition type liquid silicone rubber and a preparation method thereof, which are used for solving the technical defects that in the prior art, a silicone rubber material is easy to generate bubbles and easy to produce oil due to high viscosity.

The technical solutions in the embodiments of the present application will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The raw materials used in the following examples are commercially available or self-made. The side hydrogen-containing silicone oil is a common product in the existing market.

The preparation method of the 100mpa.s methyl terminated vinyl silicone oil comprises the following steps: 15g of hexamethyldisiloxane, 85g of octamethylcyclotetrasiloxane, 0.5g of tetravinyltetramethylcyclosiloxane and 2g of basic catalyst are mixed, reacted at the temperature of 100 ℃/4h, and low molecules are removed in vacuum to obtain the methyl-terminated vinyl silicone oil. Alkali glue which is made of tetramethyl ammonium hydroxide is used as an alkali catalyst.

The preparation method of the 50mpa.s methyl terminated vinyl silicone oil comprises the following steps: 25g of hexamethyldisiloxane, 75g of octamethylcyclotetrasiloxane, 0.5g of tetravinyltetramethylcyclosiloxane and 2g of basic catalyst are mixed, reacted at the temperature of 100 ℃/4h, and low molecules are removed in vacuum to obtain the methyl-terminated vinyl silicone oil. Alkali glue which is made of tetramethyl ammonium hydroxide is used as an alkali catalyst.

The preparation method of the 30mpa.s methyl terminated vinyl silicone oil comprises the following steps: mixing 38g of hexamethyldisiloxane, 75g of octamethylcyclotetrasiloxane, 0.5g of tetravinyltetramethylcyclosiloxane and 2g of basic catalyst, reacting at the temperature of 100 ℃/4h, and removing low molecules in vacuum to obtain the methyl-terminated vinyl silicone oil. Alkali glue which is made of tetramethyl ammonium hydroxide is used as an alkali catalyst.

The preparation method of the terminal hydrogen-containing silicone oil with 0.3 percent of hydrogen content comprises the following steps: 15g of tetramethyldisiloxane, 80g of octamethylcyclotetrasiloxane, 5g of tetramethylcyclosiloxane and 15g of cation exchange resin were mixed and reacted at 80 ℃ for 6 hours to obtain hydrogen-terminated silicone oil.

The preparation method of the terminal hydrogen-containing silicone oil with 0.25 percent of hydrogen content comprises the following steps: 6g of tetramethyldisiloxane, 84g of octamethylcyclotetrasiloxane, 10.5g of methyl-terminated side-chain hydrogen-containing silicone oil (hydrogen content: 1.6%) and 15g of cation exchange resin were mixed and reacted at 80 ℃ for 6 hours to obtain a terminal hydrogen-containing silicone oil.

The preparation method of the terminal hydrogen-containing silicone oil with 0.15 percent of hydrogen content comprises the following steps: 8g of tetramethyldisiloxane, 85g of octamethylcyclotetrasiloxane, 2g of tetramethylcyclosiloxane and 15g of cation exchange resin were mixed and reacted at 80 ℃ for 6 hours to obtain hydrogen-terminated silicone oil.

The preparation method of the terminal hydrogen-containing silicone oil with 0.12 percent of hydrogen content comprises the following steps: 5g of tetramethyldisiloxane, 85g of octamethylcyclotetrasiloxane, 3g of methyl-terminated side-chain hydrogen-containing silicone oil (hydrogen content: 1.6%) and 15g of cation exchange resin were mixed and reacted at 80 ℃ for 6 hours to obtain hydrogen-terminated silicone oil.

White carbon black has a specific surface area of 180m²White carbon black by a precipitation method.

The platinum catalyst was 2000ppm of vinyl complex.

The hydrogen content in the following examples is the mass percent hydrogen content.

Example 1

The embodiment of the application provides addition type liquid silicone rubber, and the method comprises the following steps:

1. 100 parts by mass of vinyl-terminated polydimethylsiloxane with the viscosity of 5000mpa.s are added into a kneader and stirred uniformly, and then 70 parts by mass of vinyl-terminated polydimethylsiloxane with the specific surface area of 180m²Stirring the white carbon black by the precipitation method, 6 parts by mass of hexamethyldisilazane and 1.5 parts by mass of water in a kneader for 3 hours, then heating to 180 ℃, carrying out vacuum heat treatment for 4 hours, discharging, and passing through a three-roll grinder to obtain the base rubber.

2. 100 parts by mass of the base rubber is added with 40 parts by mass of methyl terminated vinyl silicone oil with the viscosity of 100mpa.s, 10 parts by mass of vinyl terminated polydimethylsiloxane with the viscosity of 2000mpa.s and 0.5 part by mass of platinum catalyst (vinyl complex 2000PPM) are added and stirred uniformly in a planetary stirrer to prepare the agent A.

3. Adding 40 parts by mass of methyl terminated vinyl silicone oil with the viscosity of 100mpa.s into 100 parts by mass of the base rubber, adding 5 parts by mass of lateral hydrogen-containing silicone oil (the hydrogen content is 0.18%) and 2 parts by mass of terminal hydrogen-containing silicone oil (the hydrogen content is 0.25%) into 5 parts by mass of terminal vinyl polydimethylsiloxane with the viscosity of 200mpa.s, and uniformly stirring 0.05 part by mass of 1-ethynylcyclohexanol in a high-speed dispersion machine to obtain the B agent.

4. Mixing the agent A and the agent B according to the proportion of 1:1, molding at 130 ℃ for 5 minutes to prepare the addition type liquid silicone rubber, and measuring the physical properties according to the national standard.

The addition type liquid silicone rubber has the hardness of 10 degrees, the viscosity of 5500mpa.s, the tensile strength of 4.8mpa, the elongation of 460 percent and the tear strength of 10KN/m, and does not produce oil in 7 days.

Example 2

The embodiment of the application provides addition type liquid silicone rubber, and the method comprises the following steps:

1. adding 100 parts by mass of vinyl-terminated polydimethylsiloxane with the viscosity of 5000mpa.s into a kneader, uniformly stirring, and thenThe specific surface area of 70 parts by mass is 180m in four times²And stirring the white carbon black/g precipitation method, 6 parts by mass of hexamethyldisilazane, 4 parts by mass of dimethyldiethoxysilane and 2 parts by mass of water in a kneader for 3 hours, heating to 180 ℃, carrying out vacuum heat treatment for 4 hours, discharging, and passing through a three-roll grinder to obtain the base rubber.

2. 100 parts by mass of the base rubber is added with 40 parts by mass of methyl terminated vinyl silicone oil with the viscosity of 100mpa.s, 10 parts by mass of vinyl terminated polydimethylsiloxane with the viscosity of 200mpa.s and 0.5 part by mass of platinum catalyst (vinyl complex 2000PPM) are added and stirred uniformly in a planetary stirrer to prepare the agent A.

3. Adding 40 parts by mass of methyl terminated vinyl silicone oil with the viscosity of 100mpa.s into 100 parts by mass of the base rubber, adding 5 parts by mass of lateral hydrogen-containing silicone oil (the hydrogen content is 0.18%) and 2 parts by mass of terminal hydrogen-containing silicone oil (the hydrogen content is 0.25%) into 5 parts by mass of terminal vinyl polydimethylsiloxane with the viscosity of 200mpa.s and 0.05 part by mass of 1-ethynylcyclohexanol, and uniformly stirring in a high-speed dispersion machine to obtain the B agent.

4. Mixing the agent A and the agent B according to the proportion of 1:1, molding at 130 ℃ for 5 minutes to prepare the addition type liquid silicone rubber, and measuring the physical properties according to the national standard.

The addition type liquid silicone rubber has the hardness of 10 degrees, the viscosity of 5200mpa.s, the tensile strength of 4.8mpa, the elongation of 460 percent and the tear strength of 10KN/m, and does not produce oil in 7 days.

Example 3

The embodiment of the application provides addition type liquid silicone rubber, and the method comprises the following steps:

1. adding 100 parts by mass of vinyl-terminated polydimethylsiloxane with the viscosity of 3000mpa.s into a kneader, uniformly stirring, and then dividing 85 parts by mass into four times to obtain the mixture with the specific surface area of 180m²And stirring the white carbon black by the precipitation method, 8 parts by mass of hexamethyldisilazane, 1 part by mass of vinyl silazane and 2.5 parts by mass of water in a kneader for 3 hours, heating to 180 ℃, carrying out vacuum heat treatment for 4 hours, discharging, and passing through a three-roll grinder to obtain the base adhesive.

2. 100 parts by mass of the base rubber is added with 45 parts by mass of methyl terminated vinyl silicone oil with the viscosity of 50mpa.s, 10 parts by mass of vinyl terminated polydimethylsiloxane with the viscosity of 500mpa.s and 0.5 part by mass of platinum catalyst (vinyl complex 2000PPM) are added and stirred uniformly in a planetary stirrer to prepare the agent A.

3. Adding 35 parts by mass of methyl terminated vinyl silicone oil with the viscosity of 50mpa.s, 10 parts by mass of lateral hydrogen-containing silicone oil (the hydrogen content is 0.1%), 2 parts by mass of terminal hydrogen-containing silicone oil (the hydrogen content is 0.15%) into 100 parts by mass of the base rubber, adding 10 parts by mass of terminal vinyl polydimethylsiloxane with the viscosity of 500mpa.s and 0.05 part by mass of 1-ethynylcyclohexanol, and uniformly stirring in a high-speed dispersion machine to obtain the agent B.

4. Mixing the agent A and the agent B according to the proportion of 1:1, molding at 130 ℃ for 5 minutes to prepare the addition type liquid silicone rubber, and measuring the physical properties according to the national standard.

The addition type liquid silicone rubber has the hardness of 5 degrees, the viscosity of 3000mpa.s, the tensile strength of 3.1mpa, the elongation of 375 percent and the tearing strength of 6KN/m, and does not produce oil in 7 days.

Example 4

The embodiment of the application provides addition type liquid silicone rubber, and the method comprises the following steps:

1. 100 parts by mass of vinyl-terminated polydimethylsiloxane with the viscosity of 2000mpa.s are added into a kneader and stirred uniformly, and then 100 parts by mass of vinyl-terminated polydimethylsiloxane with the specific surface area of 180m are divided into four times²And stirring the white carbon black by the precipitation method, 10 parts by mass of hexamethyldisilazane, 1 part by mass of vinyl trimethoxy silane and 3.5 parts by mass of water in a kneader for 3 hours, heating to 180 ℃, carrying out vacuum heat treatment for 4 hours, discharging, and passing through a three-roll grinder to obtain the base adhesive.

2. 100 parts by mass of the base rubber is added with 55 parts by mass of methyl terminated vinyl silicone oil with the viscosity of 30mpa.s, 5 parts by mass of vinyl terminated polydimethylsiloxane with the viscosity of 300mpa.s and 0.5 part by mass of platinum catalyst (vinyl complex 2000PPM) are added and stirred uniformly in a planetary stirrer to prepare the agent A.

3. Adding 35 parts by mass of methyl terminated vinyl silicone oil with the viscosity of 50mpa.s, 10 parts by mass of lateral hydrogen-containing silicone oil (the hydrogen content is 0.05%), 5 parts by mass of lateral hydrogen-containing silicone oil (the hydrogen content is 0.1%), and 2 parts by mass of terminal hydrogen-containing silicone oil (the hydrogen content is 0.3%), adding 10 parts by mass of terminal vinyl polydimethylsiloxane with the viscosity of 300mpa.s, and stirring 0.1 part by mass of tetramethyl tetravinylcyclosiloxane uniformly in a high-speed dispersion machine to prepare the agent B.

4. Mixing the agent A and the agent B according to the proportion of 1:1, molding at 130 ℃ for 5 minutes to prepare the addition type liquid silicone rubber, and measuring the physical properties according to the national standard.

The addition type liquid silicone rubber has the hardness of 0 degree, the viscosity of 2300mpa.s, the tensile strength of 2.2mpa, the elongation of 336 percent, the tearing strength of 3KN/m and slight oil production in 7 days.

Example 5

The embodiment of the application provides addition type liquid silicone rubber, and the method comprises the following steps:

1. adding 80 parts by mass of 2000 mpa.s-end vinyl polydimethylsiloxane and 20 parts by mass of 500 mpa.s-end vinyl polydimethylsiloxane into a kneader, uniformly stirring, and then dividing 100 parts by mass into four times to obtain the mixture with the specific surface area of 180m²And stirring the white carbon black by the precipitation method, 10 parts by mass of hexamethyldisilazane, 1.5 parts by mass of vinyl silazane and 2.8 parts by mass of water in a kneader for 3 hours, then heating to 180 ℃, carrying out vacuum heat treatment for 4 hours, discharging, and passing through a three-roll grinder to obtain the base adhesive.

2. Adding 25 parts by mass of methyl terminated vinyl silicone oil with the viscosity of 50mpa.s into 100 parts by mass of the base rubber, adding 25 parts by mass of vinyl terminated polydimethylsiloxane with the viscosity of 300mpa.s, adding 0.5 part by mass of platinum catalyst (vinyl complex 2000PPM) and uniformly stirring in a planetary stirrer to obtain the agent A.

3. Adding 15 parts by mass of methyl terminated vinyl silicone oil with the viscosity of 50mpa.s, 5 parts by mass of lateral hydrogen-containing silicone oil (the hydrogen content is 0.18%), 3 parts by mass of hydrogen-containing silicone oil (the hydrogen content is 0.36%), and 1 part by mass of terminal hydrogen-containing silicone oil (the hydrogen content is 0.12%), adding 26 parts by mass of terminal vinyl polydimethylsiloxane with the viscosity of 300mpa.s, and stirring 0.05 part by mass of 1-ethynylcyclohexanol uniformly in a high-speed dispersion machine to prepare the agent B.

4. Mixing the agent A and the agent B according to the proportion of 1:1, molding at 130 ℃ for 5 minutes to prepare the addition type liquid silicone rubber, and measuring the physical properties according to the national standard.

The addition type liquid silicone rubber has the hardness of 20 degrees, the viscosity of 4000mpa.s, the tensile strength of 5.2mpa, the elongation of 462 percent and the tear strength of 11KN/m, and does not produce oil in 7 days.

Comparative example 1

The embodiment of the application provides a silicon rubber contrast without methyl-terminated vinyl silicone oil, and the method comprises the following steps:

1. adding 80 parts by mass of 2000 mpa.s-end vinyl polydimethylsiloxane and 20 parts by mass of 500 mpa.s-end vinyl silicone oil into a kneader, uniformly stirring, and then dividing 100 parts by four times into 100 parts by weight of silicone oil with a specific surface area of 180m²And stirring the white carbon black by the precipitation method, 10 parts by mass of hexamethyldisilazane, 1.5 parts by mass of vinyl silazane and 2.8 parts by mass of water in a kneader for 3 hours, then heating to 180 ℃, carrying out vacuum heat treatment for 4 hours, discharging, and passing through a three-roll grinder to obtain the base adhesive.

2. Adding 25 parts by mass of methyl silicone oil with the viscosity of 50mpa.s into 100 parts by mass of the base rubber, adding 25 parts by mass of vinyl-terminated polydimethylsiloxane with the viscosity of 300mpa.s, adding 0.5 part by mass of platinum catalyst (vinyl complex 2000PPM) and uniformly stirring in a planetary stirrer to obtain the agent A.

3. Adding 15 parts by mass of methyl silicone oil with the viscosity of 50mpa.s, 5 parts by mass of hydrogen-containing silicone oil (the hydrogen content is 0.18%), 3 parts by mass of lateral hydrogen-containing silicone oil (the hydrogen content is 0.36%), and 1 part by mass of terminal hydrogen-containing silicone oil (the hydrogen content is 0.12%) into 100 parts by mass of the base rubber, adding 26 parts by mass of terminal vinyl polydimethylsiloxane with the viscosity of 300mpa.s, and stirring 0.05 part by mass of 1-ethynyl cyclohexanol uniformly in a high-speed dispersion machine to obtain the agent B.

4. Mixing the agent A and the agent B according to the proportion of 1:1, molding at 130 ℃ for 5 minutes to prepare a silicon rubber contrast, and measuring the physical properties according to the national standard.

The silicone rubber control had a hardness of 18 degrees, a viscosity of 4200mpa.s, a tensile strength of 4.6mpa, an elongation of 453%, a tear strength of 8KN/m, and oil run out at 6 hours. It can be seen that the methyl terminated vinyl silicone oil of the example was replaced with methyl silicone oil in comparative example 1, and the resulting product was easily oiled.

The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.