In the manufacturing process of polyurethane foam, defoamer can effectively control the formation and stability of foam, and improve the quality and performance of foam. In the production and application of polyurethane coatings and adhesives, defoamers can eliminate bubbles generated during mixing, coating, and other processes, ensuring the flatness and aesthetics of the product. In the production process of polyurethane elastomers, defoamers help reduce the impact of bubbles on product quality, improve the physical properties and durability of the product. Polyurethane sealing materials, polyurethane insulation materials, and defoamers also play an important role.

There are various types of defoamers used in polyurethane, which exhibit unique technical characteristics based on their chemical structures and active ingredients. It can rapidly penetrate and destroy the foam membrane, and realize rapid defoaming. In the polyurethane system, it maintains the long-term foam inhibition ability to prevent the formation of new foam. It has good compatibility with polyurethane raw materials and additives, and does not affect the product formula and performance. It can maintain stable defoaming effect under harsh conditions such as high temperature and high pressure. Most defoamers meet environmental requirements, are harmless to human health and the environment, have low VOC emissions, are non-toxic and harmless, and comply with environmental requirements.

The action principle of defoamer for polyurethane mainly includes: reducing the surface tension of foam, making foam film easy to break by reducing the surface tension of foam. The stability of the membrane is destroyed, and the active ingredients penetrate into the foam membrane to change its structure and reduce the stability of the membrane.

Gas release promotes the rapid release of gas in foam, thus eliminating foam.