Volatilization of defoamer surfactant at gas / liquid interface

2021-03-08 11:32:59

Defoaming agent is a surfactant, which volatilizes at the gas / liquid interface. It can eliminate foam produced during construction and construction. With the rapid development of the coating industry in China, the variety of coatings is increasing and the grade is constantly upgrading. The high-grade automobile coatings, wood coatings, repair coatings, coil coatings and so on are emerging endlessly. People have higher requirements for decoration and protection of coatings, so defoaming has become a technical measure that must be considered for high-grade products. Defoamer has become an indispensable additive in the current coating process, and it has a considerable proportion in the market of coating aids.

Anti sinking agent is a kind of rheological control agent of coating, which makes the coating have thixotropic property, and the viscosity greatly improves the thickening agent, which can give the coating thixotropy. Anti sinking agent plays an important role in modern coatings, which has an important impact on the production, storage, coating and coating performance of coatings. Therefore, its use is increasingly valued and new varieties with better performance are developed. At present, the variety of anti sinking agent has been relatively complete, new products are emerging, which can basically meet the requirements of modern coatings. There are two directions for the development of anti sinking agent: one is to improve the performance of the original product, enhance its use effect in the coating, ensure the safety and convenience of use; second, develop new varieties to continue to meet the new requirements of modern high-performance coatings.

The eliminator is a material that can make the surface luster of the film obviously reduce. Luster is an important physical property of the film, and gloss is quantitatively characterized by glossiness. The definition is as follows: the ratio of the positive reflection light amount to the positive reflection light amount of the beam irradiated from the surface of the film from the specified incident angle to the positive reflection light amount on the standard plate surface under the same conditions, expressed in percentage, becomes the gloss of the film. Sometimes people need to have a glossy coating, and many applications do not need to have a light coating. Therefore, it is necessary to add a light eliminator to reduce the gloss of the coating surface. The decrease of gloss on the surface of the film is due to the small roughness of the dry film surface, which causes diffuse reflection of the incident light.

In the complex color paint, due to the different surface properties of the pigment, the uneven material and water or the large density, sometimes floating color occurs, which makes the color of the paint film darker or the paint film color is uneven. Different construction methods (such as brush coating, spraying, immersion coating, etc.) have different color patterns, such as stripes and filaments on the film. The special wetting agent can make different pigments and white pigments, or pigment mixtures have a controlled flocculation effect, and the floating color and flower phenomenon disappear. This kind of moistening agent is called anti floating color hair agent.