Defoaming agent for papermaking The progress of the papermaking industry is the use of papermaking defoamers, which makes the produced paper whiter and smoother. The foam in the papermaking white water mainly comes from many chemical additives added to the pulp pool during the pulping process, such as filter aids, retention aids, wet strength agents,…
Defoaming agent polydimethylsiloxane The most commonly used chemical component in defoamers is polydimethylsiloxane, also known as dimethyl silicone oil. It has low surface energy and low surface tension, low solubility in water and general oil and high activity. Its main chain is a silicon-oxygen bond, which is a non-polar molecule. It is not compatible with…
The main uses of non-silicon defoamers Non-silicon defoamers are used in areas with special requirements for surface tension, because most polysiloxane defoamers will strongly reduce interfacial tension. In addition, polysiloxane defoamers cannot be used for coating construction that requires repeated coating, because polysiloxane defoamers may have sliding/anti-sticking effects, and ionic (non-silicon) defoamers are required. Features:…
Application of Defoamers in Lithographic Inks Lithographic ink is a general term for various inks suitable for lithographic printing. The various parts of the lithographic printing plate are basically on the same plane, the pattern is oleophilic, and the non-pattern is hydrophilic. Printing is carried out based on the principle of oil-water repulsion, so lithographic…
Defoamer mechanism of action Any factor that can destroy the stability of foam can be used for defoaming. Defoaming covers two factors: “foam suppression” and “foam breaking”. Silicone defoamers have this function. They can reduce the surface tension of water, solutions, suspensions, etc., prevent the formation of foam, or reduce the original foam, and usually…
Defoamer oil drift – good or bad Whenever we dilute the silicone defoamer with water, we always see some oil spots floating on the surface of the water dispersion, some are a little bigger, and some are a little very small. These oil spots will not disperse even after a long period of immersion, and…
The role of defoaming agent in drying equipment For architectural coatings, the defoamer must combine with the stable surfactant layer and penetrate into the bubble film bimolecular film. After contacting the bubble, it spreads rapidly to form a very thin double film layer. As the defoamer further spreads and penetrates, it replaces the original foam…
Evaluation and use of defoaming agents The role of defoamer in water-based wood paint is mainly manifested in two aspects: one is to ensure that production can proceed smoothly, and the other is to ensure that no foam is generated during construction and to give a good paint film. Improper use of defoamers in coatings…
