A kind of silicone rubber and its production process

A silicone rubber and product technology, applied in the field of silicone rubber and its production process, can solve problems such as the viscosity cannot meet the demand, achieve the effect of increasing viscosity, ensuring purity and viscosity, and enhancing viscosity

Active Publication Date: 2022-06-28
上海达华药业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, with the development of the silicone industry, people also have more requirements for the diversification of hydrogen-containing silicone oil, and the viscosity of the product of the above-mentioned preparation method is far from meeting the current demand for high-viscosity silicone rubber.

Method used

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  • A kind of silicone rubber and its production process
  • A kind of silicone rubber and its production process
  • A kind of silicone rubber and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A kind of production technique of silicone rubber, its each component weight is as described in table 1, comprises the following steps:

[0061] S1, first weigh tetramethylammonium hydroxide and the catalyst by weight, add them to the reaction vessel, then feed 80ml of cooling water, and adjust the nitrogen flow to 1.0m 3 / s, vacuum pressure -45kPa, open the glass reactor, put the reaction vessel into it, heat it to 70±2°C, and react for 30min to obtain the catalytic precursor;

[0062] The refractive index of tetramethyldivinyldisiloxane (n D 20 ) is 1.400-1.413, specific gravity (d 4 20 ) is 0.800-0.830g / cm 3 ; The catalyst is composed of sodium trimethylsiliconate, tetramethyltetravinylcyclotetrasiloxane and hexamethylcyclotrisiloxane in a weight ratio of 1:1:0.2.

[0063] S2. After weighing the octamethylcyclotetrasiloxane and the cross-linking agent by weight, add them to the reaction vessel in S1, turn on the mixer, control the rotation speed to be 120r / min a...

Embodiment 2-6

[0072] A production process of silicone rubber is different from Example 1 in that each component and its corresponding weight are shown in Table 1.

[0073] Each component and its corresponding weight (g) in the embodiment 1-6 of table 1

[0074]

Embodiment 7

[0076] A production process of silicone rubber, the difference from Example 1 is that the specific steps of S1 are as follows, first weigh tetramethyl ammonium hydroxide and catalyst by weight, add them to the reaction vessel, and then feed 70ml of cooling water , adjust the nitrogen flow to 0.5m 3 / s, the vacuum pressure is -35kPa, the glass reactor is opened, the reaction vessel is put in, heated to 70±2°C, and reacted for 15min to obtain the catalytic precursor.

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Abstract

The application relates to the field of silicone rubber, and specifically discloses a silicone rubber and a preparation method thereof. A silicone rubber, the raw materials used for its preparation are composed of the following components in parts by weight: 230-250 parts of octamethylcyclotetrasiloxane; 1.0-2.0 parts of tetramethyldivinyldisiloxane; 0.1-0.2 part of ammonium hydroxide; 0.1-0.2 part of catalyst; 0.2-0.3 part of crosslinking agent; Trisiloxane composition. The preparation method of the present application has the advantages of being simple, convenient and easy to operate, and the silicone rubber prepared by the present application has the advantage of high viscosity, which can meet most demands of the market.

Description

technical field [0001] The present application relates to the technical field of silicone rubber, and more particularly, to a silicone rubber and a production process thereof. Background technique [0002] Among many synthetic rubbers, silicone rubber, as a medical polymer material with excellent performance, has attracted the attention of professionals in both the rubber industry and the medical field. It is odorless and non-toxic, not afraid of high temperature and resistant to severe cold. It can still retain its original strength and elasticity at 300 degrees Celsius and minus 90 degrees Celsius. Silicone rubber also has good electrical insulation, oxygen resistance, aging resistance, light resistance and aging resistance, mildew resistance, chemical stability, etc. Taking LS-4100 silicone rubber as an example, it can be used in the shell of two subcutaneous implants. The contraceptive drug is released into the human blood at a constant dose every day through the micro-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/08C08G77/04C08G77/06
CPCC08G77/08C08G77/04C08G77/06
Inventor 过玉璟盛红华徐洪菊王杰
Owner 上海达华药业有限公司
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