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Do you know the types and characteristics of silica?
May 22,2024
Types and characteristics of silica
The reinforcing filler used in silicone rubber mainly refers to synthetic silica, also known as white carbon black. White carbon black is divided into gas-phase white carbon black and precipitated white carbon black.
a. Gas phase silica
The size, specific surface area, surface properties, and structure of silica particles are related to factors such as the proportion of raw gas, combustion rate, and the residence time of SiO2 nuclei in the combustion chamber.
The finer the particles of gas-phase white carbon black, the larger its specific surface area, and the better the reinforcement effect, but the worse the operational performance. On the contrary, if its particles are thicker and have a smaller surface area, the reinforcement effect will be poor, but the operability will be better.
Gas phase silica is one of the most commonly used reinforcing agents for silicone rubber, and the vulcanized rubber reinforced by it has high mechanical strength and good electrical properties. Gas phase white carbon black can be used in combination with other reinforcing agents or weak reinforcing agents to produce rubber materials with different usage requirements.
b. Precipitated silica
The performance of precipitated silica is influenced by precipitation conditions such as acidity and temperature.
Compared with silicone rubber reinforced with gas-phase silica, the rubber reinforced with precipitated white carbon black has slightly lower mechanical strength, poorer dielectric properties, especially after being damp, but better heat aging performance, and much lower cost of mixed rubber. When the mechanical strength requirements for the product are not high, precipitated white carbon black can be used or combined with gas-phase white carbon black.
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