The three-dimensional network structure formed by fumed silica in the base material plays a role in the framework, which has a good reinforcement effect on silicone rubber and special rubber. The size of the reinforcement and the shape and shape of the network structure Firmness has a direct relationship. The smaller the silica particle size, the larger the specific surface area, the stronger the rigidity of the formed agglomerate, the larger the contact surface between the particles and the rubber compound, the more bonding points, the better the rubber reinforcement performance, and the stretching of vulcanized rubber The strength, tear strength, and abrasion resistance are also high, but the elasticity decreases, so the mixing viscosity increases and the processing performance deteriorates. In addition, studies have shown that there are too many micropores on the surface of the particles, resulting in a large surface roughness, which will have a certain impact on the reinforcement of the rubber compound, especially the wear resistance.

The number of hydroxyl groups on the surface of the white carbon black also has a greater impact on the performance of the white carbon black. If the number of hydroxyl groups is too small, the rigidity of the formed agglomerate is reduced, and the reinforcing effect of the rubber is reduced. On the contrary, if the number of hydroxyl groups is too high, the viscosity of the rubber compound will increase, and even structuring will occur, which is not conducive to processing. In general, the number of hydroxyl groups on the surface of silica is abundant. The surface modification of fumed silica is to select a suitable surface treatment agent to react with the hydroxyl groups on the silica surface through a certain process to reduce and adjust the number of surface silanol groups to achieve the best use effect.

The surface of unmodified fumed white carbon black is acidic and has a strong adsorption effect on the vulcanization system in the rubber compound, which delays vulcanization. It is often necessary to add an active agent to the rubber compound to adjust the vulcanization speed. In addition, the content of impurities in fumed silica will also affect its use effect. For example, when the content of iron is high, it will accelerate the aging of the vulcanizate.

Fumed silica has an excellent reinforcing effect on rubber, but due to its high price, it is only used for silicone rubber and special rubber in the rubber industry, which limits its use to a certain extent. With the rise of the domestic fumed silica industry, the continuous expansion of production capacity, and the increasingly reasonable product prices, it is entirely possible to broaden its application fields. MingYi Silicone Co., Ltd. has developed a production process for preparing vapor-phase white carbon black by using organic silicon by-products, which greatly reduces production costs. The products have partially replaced imports, and have achieved good economic and social benefits. The development of the silicon industry and related industries has played a huge role in promoting.