Fluorosilicone rubber compound and preparation method thereof

Abstract

The invention provides a fluorosilicone rubber compound. The fluorosilicone rubber compound is prepared from the following raw materials by weight: 100 parts of fluorosilicone raw rubber, 3-20 parts of hydroxyl fluorosilicone oil, 0.1-10 parts of polyvinyl fluorosilicone oil, 15-60 parts of fluorine-containing structured control agent modified white carbon black and 1-2 parts of a vulcanizing agent, wherein the fluorine-containing structured control agent is trimethyl-tri(trifluoropropyl)cyclotrisilazane or fluorine-containing silanol. According to the invention, the white carbon black modified by the fluorine-containing structured control agent has 3, 3, 3, -trifluoropropyl, so that the white carbon black in the treatment process has stable physical properties, and good durability and chemical resistance; meanwhile, the fluorine-containing structured control agent modified white carbon black has better compatibility with the fluorine silica gel, so that the white carbon black can be effectively combined with the fluorosilicone rubber, the vulcanization rate is increased, the cross-linking reaction with the fluorosilicone rubber is carried out, the interaction with the fluorosilicone rubber is enhanced, the tearing strength and hardness of the fluorosilicone rubber can be effectively improved, the treatment efficiency of the white carbon black can be obviously improved, and themechanical properties of the fluorosilicone rubber can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of rubber, in particular to a fluorosilicone compound rubber and a preparation method thereof. Background technique [0002] Fluorosilicone rubber is a high molecular weight polymer with -Si-O- as the main chain, methyl and fluorine-containing alkyl groups on the silicon atom, and a small amount of methyl and vinyl siloxane segments introduced for vulcanization processing. . The Si-O-Si structure of the main chain maintains the flexibility and thermal stability of the main chain of silicone rubber, while the polyfluoroalkyl group on the side chain structure endows fluorosilicone rubber with excellent solvent resistance. Fluorosilicone rubber is currently the only oil-resistant product that can be used at -70 to 230°C. It is a combination of heat resistance, cold resistance, weather resistance, compression recovery, resilience, and mold release of silicone rubber. A new type of elastomer with excellent prop...

AI Technical Summary

Problems solved by technology

CN105153213B relates to a preparation method of diphenylsilanediol, a commonly used structural control agent, but diphenyldihydroxysilane is solid, and it must be heat-treated at 150-250°C for 0.5-1.0°C before adding peroxide after mixing. It is inconvenient to use when the structure control function is small, and the silazane has poor stability, single function, and large dosage, which tends to make the rubber sticky and reduce the mechanical properties such as tear strength; CN105175729B relates to a commonly used structural control The preparation method of short-chain hydroxy silicone oil, CN102675644B relates to the preparation method of medium and high viscosity α, ω-dihydroxypolydimethylsiloxane, and CN100475878C relates to α-alkoxy-ω-hydroxyl oligodimethylsiloxane- The preparation method of methyl vinyl siloxane copolymer, but the hydroxy silicone oil has a methyl system, and the compatibility with fluorosilicon itself is not good, and the performance of the compounded fluorosilicone compound is also reduced.

CN103242534B discloses a fluorine-containing structural control agent, but the synthesis process of this structured control agent is cumbersome, the preparation is difficult, and a large amount of by-product hydrogen chloride gas emerges. The hydrogen chloride gas has a strong pungent smell and will corrode production equipment; and There are organic solvent residues, which affect the application range of fluorosilicone rubber

Images