Fluorine rubber-fluorosilicone rubber blend and preparation method thereof

Abstract

The invention belongs to the technical field of materials and relates to a rubber blending modification technology. Due to the introduction of vinyl-terminated poly(trifluoropropyl) siloxane to the main chain of fluorine rubber, the compatibility of fluorine rubber and fluorosilicone rubber can be improved, and due to the reduction of the viscosity difference between fluorine rubber and fluorosilicone rubber, the blending uniformity of fluorine rubber and fluorosilicone rubber can be improved. A fluorine rubber and fluorosilicone rubber blend provided by the invention at least comprises main rubber consisting of fluorine rubber and fluorosilicone rubber, a compatibilizer and a fluorine rubber viscosity modifier, wherein the fluorine rubber accounts for 10-50% in the main rubber, the compatibilizer is fluorine rubber grafted vinyl-terminated poly(trifluoropropyl)siloxane, the use amount of the compatibilizer is 2-20% of that of the main rubber, and the use amount of the fluorine rubber viscosity modifier is 30-45% of that of fluorine rubber. The fluorine rubber and fluorosilicone rubber blend is prepared by adopting a high-temperature vacuum blending process, has good high-temperature resistance and good medium resistance and low compression set, can be applied to the technical field of processing of sealing products and damping parts and can be particularly applied to the fields with oil resistance.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to rubber blending modification technology, in particular to fluorine / fluorosilicone rubber compatibilization technology. Background technique [0002] Fluorine rubber has excellent heat resistance, ozone resistance, oil resistance, chemical corrosion resistance and air permeability resistance. It can be widely used in aerospace, army equipment, civilian automobile manufacturing and other industries. However, the low temperature resistance of fluororubber materials can generally only reach -20°C. [0003] The blending of fluororubber and silicone rubber can significantly improve the low temperature resistance of fluororubber, but the medium resistance is greatly reduced due to the presence of silicone rubber. For example, the JSRJENIX F developed by Japan Synthetic Rubber Company and the X-36-100U series fluororubber / silicone rubber blend (50 / 50, mass ratio) of Japan Shin-Etsu Com...

AI Technical Summary

Problems solved by technology

[0003] The blending of fluororubber and silicone rubber can significantly improve the low temperature resistance of fluororubber, but the medium resistance is greatly reduced due to the presence of silicone rubber