What is Defoamer?
Defoamers are chemical additives that reduce or prevent the formation of foam in industrial process liquids. Foam is a coarse dispersion of a gas in a liquid, where the volume fraction of gas is greater than that of the liquid. The bubbles will migrate the surface because their density is less than that of liquid. As the bubble coalesces and collects at the air/ liquid interface, the bubble wall becomes thin and breaks.
A defoamer must have the properties of partial solubility, low surface tension and spread rapidly in the gas- liquid interface with maximum interaction with the air bubbles.
Defoamer for Construction Industry
Defoamers are the additives that are used for eliminating the entrapped air in the construction chemicals. Antifoaming is a very important phenomenon especially for water reducers and dry mortars in order to keep their performance. Even in construction paints, adding defoamer is compulsory to get a high quality end product.
Applications
- Concrete admixtures
- Mortar
- Waterproofing paints
- Tile adhesives