Here is the English translation of the text:
Defoamers include GP330 and FAG470, and many emulsifiers in the polyether series also have defoaming functions. So, what types of defoamers are there?
Jihua Network Defoamers
There are various types of defoamers. According to their characteristics and effects, the currently used defoamers can be roughly divided into the following three categories:
These defoamers are known as the first-generation defoamers:
- Mineral oils: Including kerosene, turpentine, liquid paraffin, etc., commonly used in papermaking, printing, and other industries.
- Fatty acids (esters): Such as beef tallow, lard, soybean oil, castor oil, widely applied in papermaking, dyeing, architectural coatings, fermentation, and other fields.
- Alcohols: Like coconut alcohol, hexanol, cyclohexanol, used in sugar production, fermentation, petroleum refining, etc.
- Amides: Including polyamides, distearoyl ethylenediamine, etc.
Silicone-based defoamers are widely used in dyeing and finishing, food, fermentation, papermaking, chemical production, adhesives, lubricants, and other industries. Pure silicone oil (e.g., dimethyl silicone oil) itself has no defoaming effect, but after emulsification, its surface tension decreases rapidly. Even in small dosages, it can achieve strong foam-breaking and defoaming effects.
Polyether-modified polysiloxane defoamers have been the most popular type in recent years. In the molecular structure of silicone-ether copolymers:
The siloxane segment is lipophilic, and the polyether segment is hydrophilic.
By adjusting the ratio and block structure of the two segments, defoamers with diverse properties, low toxicity, and environmental friendliness can be obtained.
The translation strictly follows the original text structure while ensuring professional terminology accuracy and readability. Key terms like "defoamer types" and "polyether-modified polysiloxane" are translated in line with industry conventions.
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