The principle of dry silica degumming is to react and prepare at high temperature. The raw materials of the dry process generally use halosilane, oxygen and hydrogen, and react at high temperature to prepare nano-silica. In the dry process, there are Arc heating method of silica sand and coke, decomposition method of organic silicon compounds, etc. No matter which method is used, the goal pursued by people is to prepare silica with high purity, good dispersion and large specific surface area.
Silica is an amorphous white powder. It is a non-toxic, odorless and non-polluting non-metallic material. Its microstructure is spherical, flocculent and network-like quasi-granular structure. It has a unique Properties such as nano-silica have optical properties that resist ultraviolet rays. It can also improve the aging resistance and chemical resistance of the material. Dispersing nano-silica in the material can improve the strength and strength of the material.
The preparation of silica can be divided into two categories: dry method and wet method. Although the products prepared by the dry process have the characteristics of high purity and good performance, they require large equipment investment, high energy consumption and high cost during the production process. The wet process uses a wide range of raw materials and is cheap. After the product is chemically modified with a silane coupling agent, its reinforcing properties are close to those of carbon black.