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What is silicone? What is the type of silica gel?

Source:未知 Sentiment:Published time:2017-09-05

In general, silica gel according to its nature and components can be divided into two categories of organic silica gel and inorganic silica gel.
Inorganic silica gel is a highly active adsorption material, usually with sodium silicate and sulfuric acid reaction, and aging, acid bubble and a series of post-processing process and obtained. Silica is an amorphous material, the chemical formula for the mSiO2. nH2O Insoluble in water and any solvent, non-toxic and tasteless, stable chemical properties, in addition to alkali, hydrofluoric acid does not react with any substance. Various types of silica gel because of its different manufacturing methods to form a different microporous structure. The chemical composition and physical structure of silica gel, it determines that it has many other similar materials difficult to replace the characteristics of high adsorption performance, good thermal stability, chemical stability, high mechanical strength and so on.
Silica gel according to the size of its pore size is divided into: macroporous silica gel, coarse silica gel, B type silicone, fine silica gel. Due to the different pore structure, their adsorption properties are characteristic. The silica gel has a higher adsorption capacity in the case of high relative humidity, and the amount of silica gel is higher than that of the coarse silica gel in the case of relatively low relative humidity, while the B-type silica gel is composed of coarse and fine Hole between the adsorption capacity is also between the coarse, between the pores. Macroporous silica gel is generally used as catalyst carrier, matting agent, toothpaste abrasive and so on. Therefore, different varieties should be selected according to different uses.
Silicone products Category Silicone products are many categories, can be divided into five categories, namely:
1. High temperature vulcanized silicone rubber The most commonly used methyl vinyl silicone rubber, cold phenyl silicone rubber, oil, solvent-resistant fluorosilicone rubber and nitrile silicone rubber, radiation-resistant phenylene silicone rubber. For the convenience of the use of often prepared into the compound to provide users.

2. Room temperature vulcanized silicone rubber in the form of two-component package and a single component of the points. The two components are divided into methyl, phenyl, nitrile, fluorosilicon and phenylene. The single component is divided into deacidification, dehydrocohols, deoxime type, deamination type, deamidation type, Type and so on.

3. Silicone oil can be divided into methyl silicone oil, ethyl silicone oil, methyl phenyl silicone oil, amino silicone oil, methyl hydrogen silicone oil, chlorophenyl silicone oil, fluorosilicone oil, nitrile silicone oil, long chain alkane silicone oil, Modified silicone oil and so on. There is a large amount of processed products belonging to silicone oil, that is, silicone oil emulsion, such as fabric treatment agent is an example.

4. Silicone resin Silicone resin according to the composition can be divided into methyl silicone resin, methyl phenyl silicone resin; by the form of solvent-based, solvent-free. Silicone also made of paint, molded powder and modified.

5. Silane coupling agent by functional group classification, silane coupling agent mainly vinyl silane, aminosilane, epoxy silane, mercaptosilane and methacryloxysilane and so on.