Silicone rubber is a kind of special synthetic rubber. It is a linear polysiloxane polymer elastomer with Si-O-Si as the main chain. It has heat resistance, cold resistance, ozone resistance, radiation resistance, electrical insulation, and biological phase. Excellent properties such as capacitance have been widely used in various fields such as aviation, aerospace, electrical and electronic, chemical instrumentation, automobile, machinery and other industries, as well as medical and health, and daily life. Since the molecular flexibility of raw silicone rubber is weak, the interaction between molecular chains is weak, and its strength is very low (not more than 0.4MPa), and it has no practical value without reinforcement. Adding reinforcement fillers is the main way to improve the physical and mechanical properties of silicone rubber. means. The cross-linked forms of the reinforced silicone rubber increase, and the strength is greatly improved.

The most commonly used reinforcing filler for silicone rubber is silica (5102), which is also the filler with the best reinforcing effect. At present, there are more than 30 grades of reinforced silica used in the dimethyl series of liquid silicone rubber and commercialized. The manufacturers of producing six include Degussa, Wacker, CABOT, Shenyang Chemical Plant, etc. According to the different preparation methods, white carbon black can be divided into two categories: gas phase white carbon black and precipitation white carbon black. However, no matter which, there is a compatibility problem with silicone rubber, which is manifested as a sudden increase in the viscosity of the rubber compound caused by the addition of fillers. When the sizing material requires good fluidity and transparency, silica can be used as a filler.

White carbon black as a reinforcing filler can greatly improve the mechanics of rubber, but the transparency of the silicone rubber material reinforced by white carbon black is slightly worse, and with the increase of the amount of white carbon black, the rubber viscosity increases sharply. This causes difficulty in processing, which affects the subsequent construction process and cannot meet the requirements of products that require high strength and good fluidity. At this time, using MQ resin as a reinforcing agent for silicone rubber is a better choice. MQ resin has good dispersibility and compatibility in silicone rubber, and can be enhanced by chemical combination with silicone rubber.

Compared with white carbon black, MQ resin has the following advantages:

(1) MQ resin is composed of organic and inorganic components. It is very similar to the basic component structure of silicone rubber. This special structure makes it compatible with silicone rubber. After the addition of MQ resin, it will affect the system The viscosity will not produce a big shadow. Wang Xinxin compared the effects of MQ resin and white carbon black on reinforcing and forming liquid silicone rubber (LTV). The results show that when the mechanical strength is similar, the viscosity and bonding performance of the product obtained by using MQ resin to reinforce are better than those of white carbon black. The effect is good when it is strong.

(2) MQ resin is composed of M chain links and Q chain links. The MQ resin can be easily modified by using different substituents on the M chain links of the MQ resin.

As a reinforcing material, MQ resin can be used alone or mixed with other reinforcing materials. The factors that affect the reinforcement of MQ resin include the M/Q ratio, the type of functional groups, etc. The M/Q ratio determines the MQ resin and silicone rubber The type of functional group affects the strength of the chemical bond between MQ resin and silicone rubber, which in turn affects the mechanical properties of silicone rubber.