Three-component tear-resistant silicone rubber and preparation method thereof

Abstract

The invention relates to a three-component tear-resistant silicone rubber and a preparation method thereof. The three components of the three-component tear-resistant silicone rubber mainly include silicone rubber, polyurethane and an ethylene-vinyl acetate copolymer. The preparation method comprises the following steps: (1) mixing the silicone rubber, the ethylene-vinyl acetate copolymer, a crosslinking agent and a free radical initiator at 150-200 DEG C for 5-10 min to obtain first silicone rubber mixed rubber; (2) mixing the first silicone rubber mixed rubber with a filler and polyurethaneat 30-50 DEG C for 10-20 min to obtain second silicone rubber mixed rubber; and (3) dynamically vulcanizing: adding the second silicone rubber mixed rubber and a vulcanizing agent into a twin-screw extruder, setting the screw temperature at 130-170 DEG C, and carrying out dynamic vulcanization at a rotational speed of 200-600 rpm to obtain the three-component tear-resistant silicone rubber. The three-component tear-resistant silicone rubber has excellent mechanical properties and outstanding tear resistance.

Description

technical field [0001] The invention relates to a three-component tear-resistant silicone rubber and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] Silicone rubber is one of the most important products among silicone materials. Silicone rubber is mainly composed of linear polysiloxane (or base rubber, raw rubber), reinforcing filler, crosslinking agent, catalyst and other additives. Mix all the components uniformly and process it into rubber compound. After cross-linking (or vulcanization, curing) under certain conditions, the rubber compound will transform from the initial high-viscosity plastic state to an elastic state, that is, a three-dimensional Vulcanizate with network cross-linked structure. [0003] As we all know, silicone rubber has many unique and excellent properties, such as heat resistance, cold resistance, aging resistance (ozone aging resistance, thermal oxygen aging resistance, light agin...

AI Technical Summary

Problems solved by technology

Using one or more of dicumyl peroxide or dibenzoyl peroxide as a free radical initiator, silicone rubber, ethylene-vinyl acetate polymer, and vinyl triacetoxysilane are polymerized by free radicals Connected by chemical bonds, and then chemically reacted and cross-linked with polyurethane through t

Images