How to solve the foaming problem of water-based paint?

Water-based paint is widely used in industrial production, decoration and other industries. The wide range of use shows the excellence of the product, but users still have troubles: the foam problem affects the production and process. At this time, people generally solve this problem by adding defoamers. So why use water-based paint defoamers for defoaming? How to defoam?

 Reasons

Adding conventional defoamers to water-based paint can eliminate large bubbles, but the residual microbubbles greatly affect the film-forming property, making the leveling of the paint surface not high, and leaving surface defects such as fish eyes and pinholes. The defoamers dedicated to water-based paint generally use silicone chemicals, which can take into account the advantages of mineral oils and polyethers, and have good water dispersibility. After addition, it can not only cause large bubbles to break quickly by affecting the surface tension, but also has good compatibility with a wide range of water-based systems, and can penetrate into the water-based paint system, thereby eliminating microbubbles. Without affecting the quality of the original water-based paint, the effect of rapid defoaming and long-term anti-foaming can be achieved.

 Usage

Water-based paint defoamer The use of water-based paint defoamer is generally carried out and added before the foam appears. Adding before the foam appears can play a role in pre-control and can directly avoid and inhibit the generation of foam. After the foam appears, it can be divided into one-time addition and batch addition after dilution. One-time addition is the most time-saving, but it is easy to cause waste of defoamer and increase production costs; adding in batches after dilution can better control the dosage and effect, and can make the defoamer and the foaming system quickly dissolve to achieve the best defoaming effect. Generally speaking, the addition amount is 0.1~0.3% of the foaming system, but it is mainly based on the actual amount of foam. Adding an appropriate amount is mainly based on the actual amount of foam, because too little defoamer will lead to poor defoaming effect, and too much addition may cause defects such as poor coating of the paint surface. Only the appropriate addition amount can play the best effect. It is recommended to use the sample measurement method to determine the optimal addition amount.