Defoamers mostly be liquid complex products, mainly divided into three categories: mineral oil, silicone, polyether. Mineral oil defoaming agent is usually composed of a carrier, active agents. The carrier material is a low surface tension, and its function is to dilute bearing carriers commonly used water, alcohols and the like; the role of the active agent is a foam suppression and elimination, commonly used waxes, fatty amides, fat. Silicone defoamer comprising polydimethylsiloxane generally like. Silicone defoamers poorly soluble at room temperature with a defoaming fast, suds better, but delamination occurs at a high temperature, anti-foaming slower, suds poor and so on. Polyether defoamers include polyoxyethylene polyoxypropylene glyceryl ether and the like. Polyether defoamer defoaming a long time, good effect, anti-foaming speed, good thermal stability. For example, defoamers will be used in fruit and vegetable drinks, soy, sugar and other production process.