How to use defoamer for water based coating

Defoamer for water based coating is added at a ratio of 0.1 to 1 percent, which can not only effectively break the foam that has been generated, but also significantly inhibit the foam and prevent the generation of foam. The amount used is minimal, as long as one-millionth of the weight of the foaming medium is added, it can produce the antifoaming effect. The common range is from 1 to 100 ppm, which is not only low cost but also does not contaminate the material to be defoamed. This method of adding before foaming can inhibit the generation of foam by adding antifoam agents to the system that may generate foam in advance. The defoamer is effective in prevention. When the foaming solution is either circulating or flowing, the defoamer is consumed along with the circulating flow of the foaming solution, and in this case, the defoamer is effectively used to eliminate foam by using the method of continuous dripping of the defoamer, and the amount added can be effectively controlled to achieve the purpose of using the defoamer economically. However, there are times when the relationship between the defoamer and leveling agent of water-based coatings are in opposition to each other, how to achieve a balanced state of leveling agent and defoamer in coatings?

In fact, we can mix them through the amount: the reasonable combination of the two in terms of type and amount can ensure that the water-based coating has good flow leveling and does not produce bubbles. Too much defoamer will affect the paint film and produce the shrinkage phenomenon. In order to eliminate the shrinkage phenomenon, it is necessary to use leveling agent. But the leveling agent will reduce the effect of defoaming after the addition of a defoamer, especially to reduce the longevity of the defoamer. So we have to use a good defoamer: a good defoamer, not only in the product factory has a good anti-foaming and defoaming effect, but is also long-lasting, even if it is stored for a year and a half, but also to ensure that the water-based wood paint solution still has a good defoaming effect. At the same time, the defoamer can also ensure that the system has a large tolerance, which will not be slightly more or less than the amount caused by the weakening of the defoaming effect.

(Zilibon deofamer for water based coating)