According to the composition of defoaming agent Classify and analyze the action mechanism of defoaming agents. This article focuses on analyzing the types of defoaming agents, their performance characteristics and application fields.
1. Silicone defoamer
Silicone Defoaming Agent Defoaming It has strong ability, average foam suppression ability, poor solubility, and fast defoaming speed at room temperature, but it is prone to stratification at high temperatures, has poor foam suppression, and slow defoaming speed.
Organic silicone defoaming agents generally include polydimethylsiloxane Alkane etc. Because of its low cost and fast defoaming, silicone defoaming agents are widely used in various fields of industrial production and are currently the mainstream defoaming agent products.
2. Polyether defoaming agent
The defoaming ability of polyether defoamer is relatively poor compared to silicone defoamer, but its foam suppression ability is relatively strong. It has long foam suppression time, good effect and good thermal stability, so it is used in industry. There are many fields of cleaning and high-temperature operations, and polyether-modified silicone defoamer has the advantages of both polyether and organic silicon defoamer, is currently a mainstream development direction of defoaming agents.
The main ingredients of polyether defoaming agents generally include polyoxypropylene, Glycerin, ether ethylene oxide, etc. Generally, it is added in food products such as soy products, beverages, sucrose and other production processes, and in industrial production such as papermaking, circuit board cleaning, cement mortar, coating and ink, power plant desulfurization and other fields, it has also been widely used to suppress foam. application.
3. Mineral oil defoamer
Mineral oil defoaming agents are usually composed of active agents and carriers. Carriers are mainly low surface tension substances. Water, fatty alcohols, etc. are relatively common carriers. They mainly play a carrying and diluting role, while active agents play a major role in inhibiting and eliminating foam. Commonly used active agents are fat, wax, and fat. Family amides, etc.
Analysis of defoaming principle of defoaming agent
Defoaming agent can defoaming There are many influencing factors, such as destroying the elasticity of the foam film to burst the bubble; reducing the local surface tension of the foam to burst the bubble; promoting the drainage of the liquid film to burst the bubble; solubilizing the surfactant to burst the bubble; changing the foam The rate affects the foam stability and leads to defoaming; adding hydrophobic components to the foam attracts surfactants hydrophobic end to play a defoaming effect, etc. The principle of defoaming is basically the above.
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