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The difference and application of hydrophilic silica and hydrophobic silica
Silica itself is hydrophilic, hydrophobic silica is modified by hydrophobic groups. Hydrophilicity is usually added to the aqueous system. In the organic system, the hydrophilic silica can not be well dispersed after being added, and the hydrophobic silica can be well dispersed.
Hydrophilic silica
Hydrophilic silica was prepared by hydrolysis of volatile chlorosilane in oxyhydrogen flame. From a chemical point of view, these loose white powders are composed of high-purity amorphous silica. Hydrophilic silica can be wetted with water and dispersed in water. In addition to the traditional industrial fields, such as polyester, silicone, paint and coating, hydrophilic silica products are more and more successfully used in high-tech fields. The nano particle characteristics and high purity of silica make its application in electronic and optical fiber industry play a leading role. The product of hydrophilic fumed silica has amorphous structure by X-ray analysis. According to different market and application fields, we can provide products with different particle sizes and specific surface areas. Some fumed silica products can be compressed and supplied. Some products are medical grade.
Functions of hydrophilic silica: suitable for processing and adjusting to good rheological property; reinforcement of silicone elastomer; thickening of non-polar liquid; flow aids for food and industrial powder; high chemical purity; excellent insulation performance even under high temperature; transformation of liquid into powder, such as medicine and cosmetics.
Hydrophobic silica
Hydrophobic silica is prepared by the chemical reaction between hydrophilic silica and active silane (such as chlorosilane or hexamethyldisilazane). It is hydrophobic (hydrophobic) and cannot be dispersed in water. In order to solve some special technical problems in the industry, various types of hydrophobic silica were developed. For example, the hydrophobic silica is produced by treating the modified hydrophilic silica with silane or siloxane. In the final product, the chemical treatment agent is combined on the original hydrophilic oxide by chemical bond. In addition to the above advantages of hydrophilic products, hydrophobic silica products are characterized by low moisture absorption, good dispersion, and rheological regulation ability even for polar systems. Some products, after structural modification on the basis of hydrophobic treatment, can provide further help for customers to develop new products and improve product performance. For example, in the liquid system, hydrophobic silica can reach a high content, but has little effect on the viscosity of the system.
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Functions of hydrophobic white carbon black: suitable rheology in processing and use; thickening of polar liquid, such as epoxy resin; reinforcement of silicone elastomer; high addition, such as in molded products; good hydrophobicity, improving corrosion resistance; improving dielectric properties, such as in cable composite; powder flow aid, such as in powder coating and fire extinguishing agent; improving resistance in coating and plastic Scratched.
Contact Us:
JINSHA PRECIPITATED SILICA MANUFACTURING CO.LTD.
Email.: jk@jksilica.com
Add.: Gaosha Industrial Zone, Shaxian, Fujian, China
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Room 908, Taiwan Street No.290, Xiamen, China
Mobile/WhatsApp:+86-17850500833
Contact: Wendy Wu, Sally Jiang
Tel.:+86-592-5528715
Fax.:+86-592-5528716
Adhesion is a future technology in many fields of the industry. Be it rotor blades for wind turbines, chemical anker systems or automotive construction – many constructions would be impossible without tailored adhesion systems. And they all require one thing: reliable, high-quality adhesives. With AEROSIL® fumed silica from Evonik, you can produce effective high-quality adhesives for reliable, permanent connections. Our hydrophilic and hydrophobic silica types improve the rheological and mechanical properties of adhesives and sealants, so that the required stability can be achieved with the greatest precision. In addition, they guarantee that products can still be processed effectively even after long storage periods and that ingredients do not settle. AEROSIL® fumed silica from Evonik also allows you to produce highly transparent adhesives and sealants. Our global application technology supports our customers worldwide with their individual developments.
Advantages of silica for adhesives and sealants
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