The significance of various indexes of silica in application
There are varous indexes of silica,and what is the significance in application for the main indexes of silica?
Specific surface area The reinforcing effect of white carbon black mainly depends on its specific surface generally with the increase of specific surface area, the strength indexes of rubber products are increased, but the resilience is reduced, the tear strength is reduced, and it is not wear-resistant. It is difficult to disperse when mixing, high heat generation, large Mooney viscosity of rubber material, and easy to scorch. Therefore, the specific surface area is required to be different for different formulations, different uses, and specific surface The effect of product on the physical and mechanical properties of vulcanized rubber is not consistent.
2. Oil absorption value oil absorption value reflects the high and low degree of structure, with large oil absorption value and small degree of structure. The tensile strength and hardness of vulcanizate are generally large, especially the wear resistance is small, but the elongation
is low.
3. At 900 ℃, the surface hydroxyl group is the embodiment of loss on ignition. When the surface hydroxyl is too much, it is easy to cause the structure of rubber composite and make the
material brittle. Moreover, the surface hydroxyl group has strong adsorption on the accelerator
and prolongs the curing time.
5. Generally, the pH value is about 7, the pH value increases (the acidity decreases), and the vulcanization speed of rubber compound increases.
6. The less the soluble salt content, the better. But if we want to reduce the soluble salt content, the cost of production will be greatly increased.
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