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Preparation method of high-performance addition type silicon rubber

A technology of addition-type and silicone rubber, which is applied in the field of preparation of high-performance addition-type silicone rubber to improve yellowing, increase tensile strength and elongation

Inactive Publication Date: 2013-10-30
江苏远航电缆附件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to the lack of secondary vulcanization and low viscosity requirements, there are still many technical problems in order to improve hardness, tear strength, transparency, and high elongation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The present invention will be further described below in conjunction with embodiment.

[0021] A preparation method of high-performance addition type silicone rubber, it comprises the following steps:

[0022] (1) Preparation of cross-linking agent: Weigh 202 silicone oil, D4, and Lewis acid according to a certain proportion, put them into the reaction kettle, and carry out ring-opening rearrangement at 80°C. After reacting for several hours, cool and stand still, discharge acid, neutralize, and filter to obtain the required crosslinking agent 1;

[0023] Weigh D4, hydrogen-containing cyclic body, MM, and Lewis acid according to a certain ratio, put them into the reaction kettle, heat and stir, cool and balance, discharge acid, neutralize, and filter to obtain the required crosslinking agent 2;

[0024] (2) Preparation of vinyl siloxane: In a reaction kettle with a stirrer, thermometer, condenser, pressure gauge, and nitrogen port, dehydrate D4, vinyl double-head...

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Abstract

The invention discloses a preparation method of high-performance addition type silicon rubber. Through changing the proportion of silazane to siloxane, the yellowing condition caused when white carbon block is treated can be effectively improved, and a very high requirement for the appearance can also be met; and a crosslinking agent prepared by using a high-quality D4H ring body has remarkable effects on improving the catalytic activity, stability and tensile strength and increasing the elongation.

Description

technical field [0001] The invention relates to a preparation process of silicone rubber, in particular to a preparation method of high-performance addition type silicone rubber. Background technique [0002] Unvulcanized siloxane is a kind of polymer linear polysiloxane. Because the molecules are easy to slide and flow, it is difficult to apply directly. It must be vulcanized with fillers, vulcanizing agents, structural control agents, additives, etc. used later. [0003] The measured value of Si-O bond in siloxane is 0.164nm, and the dissociation energy of Si-O bond is 460.5J / mol, significantly higher than 358.0J / mol of C-O, 304J / mol of C-C, and 318.2J of Si-C / mol, therefore, has good heat resistance. [0004] Thermodynamic calculations and spectral studies show that the methyl group in silicone rubber can freely rotate around the Si-O bond, and the molecular volume of silicone rubber is large (75cm3 / mol), and the cohesive energy density is low, which reduces the steri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08K9/06C08K3/36
Inventor 夏兰夏晴黄军平徐勤民蒋瑞林丁华平
Owner 江苏远航电缆附件有限公司