Preparation method of crude liquid fluorosilicone rubber by means of room temperature vulcanization

A technology of liquid fluorosilicone and room temperature vulcanization, which is applied in the field of rubber preparation and can solve problems such as unstable quality, polymerization or cracking, and high viscosity of liquid fluorosilicone raw rubber.

Inactive Publication Date: 2012-09-26
JIANGSU HONGDA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid fluorosilicone raw rubber prepared by this method has a relatively high viscosity, generally greater than 20,000cs. The main disadvantage is that polymerization or cracking will occur during storage, and the quality is unstable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 100kg of D3F, 100kg of octamethylcyclotetrasiloxane and 1.0kg of vinyl double end caps into the polymerization kettle, add 0.04kg of tetramethylammonium hydroxide silicon alkoxide catalyst, raise the temperature to 105°C, and react for 3hrs. Add 10kg of pure water and react at 105°C for 4hrs. After the reaction is completed, raise the temperature to 180°C, react for 3hrs, vacuumize (0.095Mpa~0.1MPa), keep the reaction temperature at 180°C, remove low molecules for 8hrs, cool to room temperature, and leave materials.

Embodiment 2

[0022] Repeat the steps described in Example 1, change the D3F in the mixed material to 200kg, and change the octamethylcyclotetrasiloxane to 0kg.

Embodiment 3

[0024] Repeat the steps described in Example 1, change the D3F in the mixed material to 150kg, and add 50kg of octamethylcyclotetrasiloxane instead.

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PUM

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Abstract

The invention relates to the field of preparation of rubber and in particular relates to a preparation method of crude liquid fluorosilicone rubber by means of room temperature vulcanization. The preparation method is characterized by comprising steps that siloxane mixture and blocking agent are added into a polymerization reactor together; tetramethyl ammonium hydroxide alkoxide is added as catalyst for polymerization reaction; after the polymerization reaction is finished, purified water is added to crack the materials to obtain low-viscosity oily substance; temperature is rose to break the enzyme of the alkoxide; and finally the low molecules in the material are removed under vacuum condition to get crude liquid fluorinated silicone rubber. The invention solves the problem that the viscosity of the crude liquid hydroxyl-blocked fluorosilicone rubber with medium viscosity is difficult to control; the viscosity range of the crude liquid fluorosilicone rubber is narrow, ranging from 6,000cs to 10,000cs; the crude liquid fluorosilicone rubber has stable content of vinyl; and the volatile matter of the crude rubber is lower than 1%.

Description

technical field [0001] The invention relates to the field of rubber preparation, in particular to a preparation method of room temperature vulcanized liquid fluorosilicone rubber raw rubber. Background technique [0002] Methyl silicone rubber has the advantages of excellent thermal stability, electrical insulation, weather resistance, ozone resistance, air permeability, high transparency, excellent heat dissipation, excellent adhesion, and fluidity. Fluorosilicone rubber has excellent resistance to aviation fuel oil, hydraulic oil, engine oil, chemical reagents and solvents due to the introduction of trifluoropropyl groups in the molecular side chain, and can work for a long time at -55 to +200 °C. [0003] Fluorosilicone rubber is an indispensable high and low temperature fuel resistant sealing material for industry. Fluorosilicone rubber currently on the market is mainly divided into high temperature vulcanization and room temperature vulcanization according to the vulca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/24C08G77/08
Inventor 朱德洪戴晓勇刘金明朱恩俊祝纪才王琴芳
Owner JIANGSU HONGDA NEW MATERIAL
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