Application Of Silica Fume In Tire Formulations

The silicon dioxide powder is waste items collected from the ferrosilicon smelting process

. The smelting silicon dust derived from the dry cleaning equipment with high silica content, high activity, high performance and versatile. The silica fume is tested as a reinforcing agent in tire formulations. The silica fume is used in the tire tread and carcass rubber formulations for semi-finished products and finished application. The results show that the silicon dioxide as an inorganic filler has good reinforcement performance. It can fully meet the performance requirements of the tire tread and carcass, reduce costs and improve the ecological environment.

As the main component of silica fume and silica is silicon dioxide, understand the performance difference between the two and has analysis and selection of silicon powder and silica micro-particle is necessary. Silica and silica fume partial replace carbon black contrast small co-ordination. Silica fume specific surface area was significantly lower than the silica particle size and wide distribution. Silica fume showed a continuous smooth small balls granular silica was fluffy amorphous flocculent, silica fume and white carbon black surface area and particle size are not in the same grade, micro-silica fume simple structure, the dispersion is better than silica.

Silica fume and silica the main component is silicon dioxide. But the processing environment is different. So the surface activity is different. Silica particle surface contains siloxane and silanol reactive functional groups, and coupling agent Si69 is a bifunctional silane modifier, a functional group with active groups of the silica surface reactions, chemical binding of other functional groups can be rubber macromolecules, coupling agent Si69 play a rubber with white carbon black crosslinking role in the mixing due to the coupling agent Si69 silica reaction to improve the rubber silica-invasive improved silica dispersion; silica fume is generated after calcination at high temperature, the boron powder particle surface does not contain siloxane and silanol reactions with bifunctional silane modifier active groups in the formulation coupling agent Si69 silica fume does not work.

In mixing, silica fume eat the powder dispersion. Adding silica fume tread formula is fully capable to reach the normal level of production formula. The same amount of matrix formulations with silica fume will replace the activity of calcium.300% of the vulcanizate modulus, tensile and tear performance improved other physical properties of the active calcium; tensile properties decreased gradually with the increase of the amount of silica fume, and other properties remain basically unchanged. The density of the silica fume is too large and the direct use will result in volume increase in costs. And this should be noted that from the formula to adjust the density of the rubber meet the conditions of the physical properties of as much as possible to reduce the density of the rubber.

Silica fume is the ideal material for part or all alternative semi-reinforcing carbon black. Surface area and particle size of silica fume and silica are not in the same grade. The structure of silica fume is simple with good dispersion. The tread compound with silica fume, carcass rubber formulations using the various performance levels and the use of equivalent alternative active calcium and finished tire completely normal production formula. Silica fume and nickel powder are superior to active calcium. Compared with other filling reinforcing agent, performance and prices of silica fume have great advantages. On the other hand, because silica fume is waste recycling products in the metallurgical industry, the development and utilization of such products are very favorable to improve the ecological environment and people's health.Source:http://www.mhcmp.com

by: anelwew

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