hydrophilic fumed silica

Defoamers are currently a widely used additive, playing a significant role in various fields such as food, petrochemicals, papermaking, and industrial cleaning. Among them, silicone defoamers are the most extensively used and consumed defoamer products. Other types of defoamers, such as mineral oil and polyether, complement the applications of silicone-based defoamers. The main components of silicone defoamers include silicone paste, emulsifiers, and thickeners, with silicone paste being the active ingredient in silicone defoamers. Silicone paste is primarily composed of silicone oil (or mineral oil, vegetable oil, etc.) and silica. As an essential component of defoamers, silica plays a crucial role. Taking a defoamer with dimethyl silicone oil as the silicone paste base as an example, due to the poor dispersibility and low solubility of dimethyl silicone oil in emulsion systems, it is necessary to use silica (white carbon black) or various emulsifiers to improve its dispersion. The silanol groups in white carbon black can form hydrogen bonds with water, increasing the viscosity of the system, achieving a thickening effect, and promoting the dispersion and stability of the defoamer. Due to the small particle size, large specific surface area, and high surface energy of white carbon black, it can generate a significant force to adsorb bubbles. Together with silicone oil, it forms a force that attacks bubbles, creating weak points. Under the low surface tension of silicone oil, the bubbles rupture, leading to defoaming. This is the general principle of how defoamers work. In summary, white carbon black primarily serves to thicken, disperse, and adsorb bubbles in defoamers. Hydrophilic white carbon black has poor compatibility with silicone oil, whereas hydrophobic white carbon black, after surface modification, can be well wetted and dispersed in silicone oil systems due to its hydrophobicity. The preparation method of defoamers mainly involves two steps. The first step is the preparation of silicone paste, which involves the dispersion and reaction of white carbon black in silicone oil. The second step involves adding emulsifiers, thickeners, and other additives to emulsify and disperse the silicone paste into an emulsion, which can then be diluted as needed to prepare defoamers of different concentrations. White carbon black can be divided into two types based on production processes: precipitated white carbon black and fumed white carbon black. The advantage of precipitated white carbon black lies in its low cost, but due to its larger particle size, it is prone to sedimentation, which can lead to clogging of filters in many defoamer applications. In contrast, fumed white carbon black has smaller particle size, better suspension properties, good compatibility with emulsifiers, requires less additive amount, and has excellent thickening and anti-sedimentation properties. Additionally, fumed white carbon black that has undergone hydrophobic modification inherently possesses certain defoaming properties, making it an ideal solution to the problems faced by precipitated white carbon black in defoamer applications. As the price of fumed white carbon black decreases, its cost-effectiveness in defoamers will become even more prominent, making it an excellent choice for defoamers. In this context, GESEESIL 200, a hydrophilic silica product from Gesee New Materials, stands out as a high-quality option for defoamer formulations. For more information, visit www.geseesiltech.com

In today's rapidly developing field of materials science, fumed silica (fumed silica), as a high-performance nanomaterial, is gradually becoming a ‘star product’ in the rubber, coatings, electronics, pharmaceutical and other industries. Advantages of Fumed Silicon Dioxide Products of Gesee 1.Excellent dispersibility   Through the unique surface treatment technology, Gesee's fumed silica shows excellent dispersibility in all kinds of substrates, which can effectively improve the mechanical properties and stability of composite materials. 2.High purity The purity of the product is up to 99.9% and the specific surface area is up to 200-400 m²/g. This high purity and high specific surface area makes it excellent in rubber reinforcing, coating thickening and electronic material filling. 3.Customised Solutions In response to the needs of different industries, Gesee New Materials provides customised fumed silica products, including different particle sizes and functionalised products, to meet the diverse needs of customers. Application areas of fumed silica 1. Rubber industry As a reinforcing agent in rubber products, fumed silica can significantly improve the abrasion resistance, tear resistance and mechanical strength of rubber, which is widely used in tyres, seals, hoses and other products. 2. Coatings and Inks   Fumed silica is used as thickener and anti-settling agent in coatings and printing ink, which can improve the rheological properties and stability of the products, and at the same time enhance the weather resistance and gloss of the coating. 3. Electronic materials In the field of electronic packaging materials and semiconductors, fumed silica is used as a filler, which can effectively improve the insulating property, thermal conductivity and mechanical strength of the materials, and meet the needs of high-performance electronic components. 4. Medicine and food   Fumed silica is used as a drug carrier in pharmaceuticals to improve the solubility and bioavailability of drugs; in the food industry, it is widely used in the production of powdered food as an anti-caking agent and flow aid.   Zhengzhou Gesee new materials always take technological innovation as the core and customer demand as the guidance, and is committed to providing high-performance, green and environmentally friendly fumed silica products for customers around the world.