The amount of defoamer in printing and dyeing auxiliaries is very small, but it is indispensable. In the combination of printing and dyeing production and printing auxiliaries, silicone defoamer is the most used one.






First, the classification of defoamer:
The main principle of defoamer is to control and weaken the formation and stability of foam by using chemicals with surface active properties to reduce the surface tension of the liquid and destroy the bubble structure.


According to the composition of the defoamer can be divided into: silicone, polyether, fatty acids, alcohols, mineral oil, etc. In the printing and dyeing industry, according to the use of different, we can be divided into silicone defoamer and non-silicon defoamer.


Second, silicone defoamer features:
1, to achieve the same defoamer effect, the amount of silicone defoamer is much lower than other non-silicon defoamer.


2, the printing and dyeing industry is the most used silicone defoamer, especially in the combination of additives such as pre-treatment additives that require low bubbles.


3, silicone defoamer has foam inhibition, which is not possessed by other non-silicon defoamer.


4, the disadvantage of silicone defoamer is that it is easy to drift oil, resulting in oil spots; A good silicone defoamer should have good stability under different PH values, high temperature, shear, electrolyte and other conditions.