Why Use Defoamers and Antifoams?
Silicones are widely used as defoamers and antifoams in many industries. The terms antifoams and defoamers are often used interchangeably. They are used to either control foam formation or eliminate foam from forming during the intended process.
Foam can cause serious problems in industrial processes. It causes defects on surface coating and prevents the efficient filling of containers. It can cause vessels to overflow, interfere with processing, and slow drainage during drying. This will increase the cost of business, and damage materials.
Defoamers and antifoams are insoluble in the foaming medium and inhibit the formation of foam on the surface of liquids by reducing the surface tension. They have a low viscosity and a propensity to spread rapidly on foamy surfaces. It is attracted to the air-liquid surface where it destabilizes the foam bubbles. This causes the air bubbles to rupture and breaks down the surface foam. Entrained air bubbles congregate together, and the larger bubbles rise to the surface of the bulk liquid quicker.
Silicone defoamers and antifoams cost less to use than their organic counterparts because they are effective at a much lower dosage. The lower dose has less impact on the finished product. They are also longer lasting than organic antifoams and less reactive in the foaming medium, leading to fewer compatibility problems. Their stability over a wide temperature range makes them desirable for many industries. They perform well in difficult conditions such as high temperatures and high pH values.
Some Common Applications:
- Detergents, cleaners and polish formulations
- Pharmaceutical and food preparation processes
- Petrochemical and agrochemical industry
- Textile and leather industry
- Pulp and paper production
- Waste water treatment plants
- Paints, coatings and dispersions formulations
Taychem offers a variety of defoamers that are effective in many types of industries. Call us to determine which product is best for your needs.