Silicone rubber and production process thereof

A production process and technology of silicone rubber, applied in the field of silicone rubber, can solve the problem that the viscosity cannot meet the demand, etc., and achieve the effect of increasing the viscosity, high overall viscosity coefficient and rapid response

Active Publication Date: 2021-09-03
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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  • Silicone rubber and production process thereof
  • Silicone rubber and production process thereof
  • Silicone rubber and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0061] S1. First weigh tetramethylammonium hydroxide and catalyst by weight, add them to the reaction vessel, then pour 80ml of cooling water, and adjust the flow rate of nitrogen to 1.0m 3 / s, vacuum pressure -45kPa, open the glass reactor, put the reaction vessel in, heat to 70±2°C, react for 30min, and prepare 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 trimethylsilanolate, tetramethyltetravinylcyclotetrasiloxane and hexamethylcyclotrisiloxane in a weight ratio of 1:1:0.2.

[0063] S2. After weighing octamethylcyclotetrasiloxane and crosslinking agent by weight, add them to the reaction vessel in S1, turn on the mixer, control the rotation speed at 120r / min and stir for 5min...

Embodiment 2-6

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

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

[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 take tetramethylammonium hydroxide and catalyst by weight, add them to the reaction vessel, and then feed 70ml of cooling water , adjust the nitrogen flow rate to 0.5m 3 / s, vacuum pressure -35kPa, open the glass reactor, put the reaction vessel in, heat to 70±2°C, react for 15min, and prepare the catalytic precursor.

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Abstract

The invention relates to the field of silicone rubber, and particularly discloses silicone rubber and a preparation method thereof. The silicon rubber is prepared from the following raw materials in parts by weight: 230 to 250 parts of octamethylcyclotetrasiloxane; 1.0 to 2.0 parts of tetramethyl divinyl disiloxane; 0.1 to 0.2 part of tetramethylammonium hydroxide; 0.1 to 0.2 part of a catalyst; 0.2 to 0.3 part of a cross-linking agent; the catalyst is prepared from sodium trimethylsilanolate, tetramethyl tetravinyl cyclotetrasiloxane and hexamethyl cyclotrisiloxane. The preparation method has the advantages of being simple, convenient and easy to operate, and the prepared silicone rubber has the advantage of being high in viscosity and can meet most requirements of the market.

Description

technical field [0001] The application relates to the technical field of silicone rubber, more specifically, it relates to a silicone rubber and its production process. Background technique [0002] Among many synthetic rubbers, silicone rubber, as a medical polymer material with excellent performance, has attracted the attention of professionals both in the rubber industry and in the medical field. It is odorless and non-toxic, not afraid of high temperature and cold, and 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 and aging resistance, light and aging resistance, mildew resistance, and chemical stability. Among them, LS-4100 silicone rubber is taken as an example, which can be used as the shell of two subcutaneous implants. The contraceptive drug is released into the human blood at a constant dose every day through the micro-mouth of the silicone rubb...

Claims

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Application Information

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Patent Type & Authority Applications(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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