The main components of defoamers include silicones (such as polydimethylsiloxane), polyethers (such as polyoxyethylene polyoxypropylene ether), mineral oils (such as kerosene or diesel), surfactants (such as emulsifiers), and auxiliary components (such as carriers, stabilizers, etc.).
The following is a detailed classification and characteristics:
1. Silicone defoamers
Core ingredients: polydimethylsiloxane (silicone oil) and its derivatives.
Characteristics: chemical inertness, high and low temperature resistance (-50℃ to 130℃), low surface tension, fast defoaming speed.
Application: textile, papermaking, chemical, food (such as tofu processing) and other industries.
2. Polyether defoamers
Core ingredients: polyether compounds such as polyoxyethylene (PEO) and polyoxypropylene (PPO).
Characteristics: strong hydrophilicity, long anti-foaming time, non-toxic (suitable for food industry (such as juice, fermentation process).
Sub-types: linear polyether, terminal esterified polyether, etc.
3. Mineral oil defoamer
Core ingredients: mineral oil (kerosene, diesel) compounded with wax or silica.
Characteristics: low cost, environmentally friendly, but poor compatibility.
Application: coatings, inks and other fields that do not require high gloss.
4. Other types
Surfactants: such as emulsifiers, defoaming is achieved by dispersing foaming substances.
Compound type: silicone polyether defoamer (silicone + polyether), with better comprehensive performance.
Food-specific: such as high-carbon alcohol fatty acid esters (used in soy products), propylene glycol polyether (limited addition).
5. Auxiliary ingredients
Carrier: water or mineral oil, to help disperse the active ingredients.
Stabilizer: thickener (such as polyethylene ether) to extend the action time.