Polymerization method for crude rubber of fluorinated silicone rubber

Abstract

The invention relates to a method for aggregation of hydrofluorosilicic crude rubber. The hydrofluorosilicic crude rubber prepared by this invention is of even molecular weight distribution and superior performance, and can exactly control the average molecular weight of the product. The method includes the following steps: first preparing the polymeric materials, in which the polymeric materials can be fluosilicic monomer D3F, vinyl silicon monomer or alkaline agent, mixing and dewatering the raw materials, then inputting the materials into the polymerization kettle, after the polymerization, the materials entering the devolatilization kettle because of pressure differences, then entering the out-feed extrusion machine, and the polymer blendedly discharging by the extrusion machine. The hydrofluorosilicic crude rubber prepared by this invention is of even molecular weight distribution and can exactly control and adjust the average molecular weight of the product, so it can improve the homogeneity of the product.

Description

technical field [0001] The invention relates to a polymerization method of rubber raw rubber, in particular to a polymerization method of fluorosilicone rubber used in automobile industry and aerospace industry. Background technique [0002] Fluorosilicone rubber is a special synthetic rubber material whose main chain is a silicon-oxygen-containing structure and the side chain is a fluorine-containing alkyl structure. The special chemical structure of this material makes it not only have the excellent high and low temperature performance of silicone rubber, but also have the excellent high temperature resistance, chemical medium resistance and oil resistance of fluororubber. [0003] In 1951, the U.S. Air Force Department and Dow Corning began cooperative research, and in 1956 began to launch the first fluorosilicone rubber product. Since then, the product types and application fields of fluorosilicone rubber have been rapidly expanded. Fluorosilicone rubber is mainly divi...

AI Technical Summary

Problems solved by technology

Fluorosilicone raw rubber in this molecular weight range has a high viscosity, and it is difficult to transfer heat and mass during the polymerization process. It is difficult to control the molecular weight and distribution of the polymerized product through the general kettle polymerization method. The highest / lowest molecular weight and average molecular weight in the product The deviation is generally as high as about 300,000, which seriously affects the processability of fluorosilicone rubber and the performance of vulcanized products.

[0005] There are many patents on fluorosilicone rubber at home and abroad, but few patents on raw rubber polymerization