Bicomponent addition type room curing silicon rubber and preparation method thereof

Abstract

The invention discloses a bicomponent addition type room curing silicon rubber and a preparation method thereof. A component A of the room curing silicon rubber comprises the following components in part by weight: 30 to 60 parts of allyl-terminated organic polysiloxane of which the viscosity is 450 to 1,000 mPa.s, 15 to 30 parts of 400-1,000-mesh quartz powder, 23 to 35 parts of 600-1,200-mesh aluminum oxide, 0.1 to 5 parts of coloring agent, and 0.5 to 3 parts of platinum catalyst; a component B comprises the following components in part by weight: 30 to 55 parts of the allyl-terminated organic polysiloxane of which the viscosity is 450 to 1,000 mPa.s, 20 to 30 parts of the 400-1,000-mesh quartz powder, 18 to 30 parts of the 600-1,200-mesh aluminum oxide, 0.1 to 5 parts of inhibiting agent, 0.5 to 3 parts of hydrogen-containing silicone oil containing 0.17 to 1.2 parts of hydrogen, 0.5 to 6 parts of viscosity increaser, 0.3 to 1 part of anti-settling agent and the like. The prepared bicomponent addition type room curing silicon rubber has high heat conductivity and fluidity and can achieve cohesive failure by being bonded with metals such as aluminum, copper, stainless steel and the like and plastics such as PBT, ABS, PC, epoxy resin and the like, the bonding strength can be over 0.5 MPa, and the properties such as viscosity, hardness, density, strength, linear shrinkage and the like of a liquid silicon rubber are basically not influenced.

Description

technical field [0001] The invention belongs to the field of organosilicon room temperature curing silicone rubber, in particular to a two-component addition type room temperature curing silicone rubber and a preparation method thereof. Background technique [0002] In recent years, with the development of my country's organic silicon industry and the promotion of application technology, the research and development, production and application of addition-type liquid silicone rubber have also made great progress. [0003] Addition-type liquid silicone rubber (LSR) is a relatively high-grade silicone rubber developed in the late 1970s. Compared with condensation-type liquid silicone rubber, it has the advantages of no by-products during the vulcanization process, minimal shrinkage, and deep vulcanization. , The sealing performance at high temperature is also better than that of the condensation type. In addition, LSR also has the outstanding advantages of simple process and ...

AI Technical Summary

Problems solved by technology

[0004] However, the adhesion of addition-type liquid silicone rubber is poor. When used as potting, coating, and insert injection molding materials, in order to improve the adhesion to the contact substrate, it is usually necessary to pre-coat the substrate. Treat or Add Tackifiers

Use a primer to treat the surface of the substrate. This method increases the production process and production time and reduces production efficiency. At the same time, the primer uses more flammable solvents, which causes transportation hazards and environmental pollution.