Silicone rubber has many excellent properties, but its mechanical properties such as compression strength and tear strength are poor, can not meet the requirements of the process, it needs to add fillers to modify and enhance it. When MQ silicone resin is used as reinforcement filler, it can not only increase the strength of rubber matrix, but also not increase the viscosity of the system too fast, which is beneficial to the subsequent operation, and the prepared vulcanized rubber is transparent.
The organic part of MQ silicone resin can improve its compatibility with silicone rubber and increase viscosification. The silicon oxygen chain can improve the mechanical strength, cohesion strength, peel strength and high temperature resistance of silicone rubber, and play a reinforcing role. Additive vulcanized silicone rubber is mainly composed of raw rubber containing vinyl, reinforcing filler, hydrogen containing silicone oil crosslinking agent and platinum catalyst. Under the action of platinum catalyst, vinyl-containing MQ resin can chemically combine with raw gum through hydrosilane addition reaction with SIH crosslinking agent, thus forming a three-dimensional network structure and playing a reinforcing role. With the increase of the amount of MQ silicone resin, the hardness, tensile strength, tear strength, adhesive property and crosslinking density of silicone rubber gradually increase to the optimum value.