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The thickening and anti settling application of gas-phase silica in silicone oil defoamers
Release time:
2024-05-19 20:13
Source:
Defoamers, as an important auxiliary agent in industry, are widely used in various fields such as textiles, papermaking, petroleum, food, pharmaceuticals, etc., despite their small dosage, but they are indispensable. It can be broadly divided into non silicon based and silicon based defoamers. Silicon based defoamers are the most widely used and efficient type of defoamers, which are mainly composed of silicone oil/white carbon black (fumed silica) silicone oil paste and modified silicone oil.
(Silicone oil defoamer)
The important indexes of lotion silicone oil defoamer are defoaming effect and storage stability, especially lotion containing silicone paste. There are many reasons that affect the stability of lotion, such as the particle size of lotion, the viscosity of lotion, etc. The particle size of lotion is the most important control index of lotion defoamer, which is generally required to be less than 10um. The particle size of lotion depends on the selection of emulsifier, emulsification process and particle size.
(Silicone oil defoamer)
Gaseous silica (fumed silica) is an extremely fine nanoscale amorphous silica obtained by high-temperature water condensation of halosilane in a hydrogen oxygen flame, with a primary particle size of around 7-40nm. The silicone oil lotion particles containing this kind of white carbon black form a basic defoamer unit with very small particles and a very large number in the foaming liquid, so that the defoamer can achieve the best defoaming effect. Meanwhile, due to its small particle size, large specific surface area, and stable three-dimensional hydrogen bonding network structure, the white carbon black particles can be uniformly and stably distributed throughout the entire system, ensuring stable storage of the system. Therefore, as a very good thickening and anti settling agent in defoamers, gas-phase silica should generally be selected with a specific surface area of 200-3002/g. In summary, the gas-phase method of white carbon black silicone oil paste plays a very important and efficient composite and synergistic role as an defoaming agent in silicone oil defoamers, greatly improving the defoaming efficiency of silicone oil.
(fumed silica)
At present, hydrophilic and hydrophobic gas-phase silica products produced by domestic manufacturers of fumed silica such as Huifu Nano have been widely used in silicone oil defoamers.
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