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Common problems in the development of ceramic silicone rubber

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At present, as far as ceramicized silicone rubber is concerned, the related applications of ceramicized silicone rubber have not been fully developed, and the relevant industrial chain has not reached the mature standard requirements. Therefore, ceramicized silicone rubber is prone to incomplete ceramic production during the research and development process. Cracks, holes, insufficient strength after ceramic formation, dispersion of ceramic fillers and product physical properties before ceramic silicone rubber is ceramic.

The ceramicized silicone rubber has incomplete ceramics, cracks and holes. The main reason is that the selection of ceramic fillers is unreasonable: when the silicone rubber material is not burned by an open flame at a high temperature, a lamellar continuous phase is formed to cover; The thermal expansion coefficient is high, and the difference is too large; when mica is selected as one of the types of ceramic fillers, the content of K element in the mica composition is high, which leads to cracks in the area when it is burned by an open flame at high temperature. The selection ratio of structural additives in the finished porcelain auxiliary materials is unreasonable, and the commonly used structural additives are magnesia, zirconia, wollastonite and so on. The ceramic fillers developed by our company are divided into ceramic main fillers and ceramic reinforcing accessories: the main products of ceramic main fillers include mica powder and kaolin, which are suitable for the rapid change of phase state when the silicone rubber polymer material is burned by an open flame. In the form of large sheets, the organic substrate is wrapped and covered to form the main skeleton of the porcelain; the products of the reinforcing auxiliary materials for the porcelain include aluminum hydroxide, magnesium hydroxide, wollastonite, talc, calcium carbonate, diatomite, bentonite, silicon Compared with similar products on the market, micropowder is used as a performance supplement for silicone rubber polymer materials before porcelain is formed, and the requirements for material processability and mechanical properties are improved, and the strength of the porcelain body will not increase after the porcelain is formed. Larger impact powder material.

Porcelain-forming fillers are matched with thousands of thousands. Why can the above-mentioned fillers meet the requirements of porcelain-forming and ensure that there will be no problems in the porcelain-forming? Mica powder and kaolin, as typical clay minerals, were one of the main raw materials for firing ceramics before they were widely used in industrial products. After thousands of years of development, they have continued to this day. When silicone rubber chooses mica powder, kaolin and other fillers After being used as the main frame of the porcelain, supplemented by fillers with low melting point temperature and high porcelain strength as modifiers, it is used to further fill the voids of the porcelain skeleton, thereby forming a complete ceramic phase material.

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