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Bicomponent condensed type room temperature sulfidization silicon rubber high-efficiency curing agent

A room temperature vulcanization and condensation type technology, which is applied in the field of condensation type room temperature vulcanization silicone rubber curing agent, can solve the problems of reducing the performance of silicone rubber, achieve the effect of improving curing activity, improving various performances, and shortening the curing time

Active Publication Date: 2009-01-07
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And there is also the problem that when the temperature is low in winter, vulcanization can only be achieved by increasing the amount of curing agent, which reduces the performance of silicone rubber.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 200 grams of ethyl orthosilicate, 100 grams of dibutyltin dilaurate, and 10 grams of butyl titanate into a 500 ml three-neck flask with stirring, raise the temperature to 60°C and keep it for 2 hours, then take off the vacuum and cool down. Prepare curing accelerator A for subsequent use.

[0021] Add 70 grams of dibutyltin dilaurate, 80 grams of tetraethyl orthosilicate, 10 grams of curing accelerator A, and 60 grams of dimethyldimethoxysiloxane into a stirred 500 ml flask and stir evenly to obtain Curing agent B

[0022] Mix 62 parts of base rubber, 28 parts of white carbon black filler, and 30 parts of diluent to prepare 534 type room temperature vulcanized silicone rubber compound. Take 100 grams of rubber material and add 2 grams of curing agent B to prepare silicone rubber. The curing time and performance test of the silicone rubber after curing are shown in Table 1.

[0023] Tensile strength and elongation: measured according to GB / T528-1998; tear strength...

Embodiment 2

[0025] Take 300 grams of ethyl orthosilicate, 180 grams of dibutyltin dilaurate, and 20 grams of butyl titanate into a 500 ml three-necked flask with stirring, raise the temperature to 70 ° C and keep for 3 hours, then vacuum off the low, after cooling Prepare curing accelerator C for subsequent use.

[0026] Add 60 grams of dibutyltin dilaurate, 80 grams of tetraethyl orthosilicate, 20 grams of curing accelerator, and 60 grams of MM into a stirred 500 ml flask and stir evenly to prepare curing agent D.

[0027] Take 100 grams of 534 type room temperature vulcanized silicone rubber described in Example 1, add 2 grams of curing agent D, and cure. The curing time and the performance test of the silicone rubber after curing are shown in Table 1.

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PUM

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Abstract

The invention discloses a double-component condensed type RTV silicone rubber curing accelerator which is obtained by mixing cross-linking agent, catalyst and catalyst promoter by a certain ratio; the invention also discloses curing agent which contains the curing accelerator and the application of the curing agent in silicon rubber preparation. The curing accelerator of the invention can effectively improve the curing speed and the silicon rubber performance after curing.

Description

technical field [0001] The invention relates to the field of condensation type room temperature vulcanizing silicone rubber curing agent. Background technique [0002] Two-component condensation type room temperature vulcanized silicone rubber is a silicone rubber with certain fluidity, which can be cured into an elastomer by adding a curing agent at room temperature. It usually consists of two components: rubber compound and curing agent. The rubber compound is mainly obtained by kneading the base polymer, filler and other additives through a kneader and grinding by a three-roller machine. The curing agent is obtained by mixing a catalyst and a crosslinking agent in a certain proportion. [0003] At present, dibutyltin dilaurate is generally used as catalyst in China, ethyl orthosilicate is used as crosslinking agent, and a mixture of the above two is used as curing agent. The curing speed of this curing agent is relatively slow, especially in the case of low temperature i...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08K5/57C08K5/5415
Inventor 王伟邵月刚郑瑞兵朱晓英陈向前李培国
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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