In recent years, with the improvement of people's living standards and the need for the development of an environmentally friendly society, the amount of various packaging materials has increased significantly and has become more and more exquisite. The demand for water-based coatings has increased significantly, especially the application of water-based inks has increased year by year. For example, gift packaging, food packaging, liquid milk packaging, etc., all use environmentally friendly water-based printing inks such as acrylic resin, rosin resin, and water-based polyurethane.

The rapid development of water-based coatings and inks has driven the development of water-based coating additives and ink additives. Defoamer is an indispensable and important additive for water-based ink, which plays a role in eliminating foam and inhibiting foam generation during the grinding, ink preparation and use of water-based ink. The development of water-based ink has driven the increase in the amount of defoamers, and at the same time put forward higher requirements for the performance of defoamers, mainly including:

①Excellent dynamic defoaming and antifoaming performance, which can prevent micro

Bubbles and big bubbles.

②The system has good compatibility, good auxiliary film-forming performance, and will not produce shrinkage cavity and fish eyes.

③Chemical stability, high temperature resistance, strong acid and alkali resistance, and can still maintain good defoaming performance in different application conditions (within the pH range of 4-12).

④ Improve the leveling, wettability, abrasion resistance and smoothness of inks and coatings.

The defoamers used in water-based inks mainly include: (1) Silicone defoamers: mainly include emulsion polysiloxane and polyether modified silicone defoamers. This kind of defoamer has excellent anti-foaming ability and thermal stability, and is widely used in water-based inks.

(2) Polyether block type defoamer: This type of defoamer has excellent compatibility, less paint film surface defects, does not affect gloss and haze, and is suitable for ink with high surface requirements.

(3) Composite defoamer: mineral oil/wax/organic silicon, mineral oil/hydrophobic particles/organic silicon, organic silicon/hydrophobic particles, etc. This kind of defoamer has excellent versatility and compatibility, and less surface defects of paint film.