The demand for multifunctional surfactants is becoming more and more urgent

2022-02-10 10:50:01

Surfactants commonly used in aqueous paint pastes, such as castor oil polyoxyethylene amide, fatty alcohol polyoxyethylene ether silane and fatty alcohol polyoxyethylene ether, have a good wetting and dispersion effect on pigment particles, but have an impact on the consistency, leveling and foaming of the system. For example, during the pre dispersing and grinding process, it is easy to frother and the foam has a significant durability. This is due to the dry surface inclusion agent on the one hand, which reduces the surface tension of the system, and makes the energy required for the foam to stabilize. The existence of foam will affect the performance and storage effect of color paste, and foam inhibitor and defoamer should be added in the production process. The amount of foam will increase with the increase of surfactants. The use of antifoaming agent and defoamer will affect the recoating and shrinkage and shrinkage of waterborne coatings. Therefore, the less surfactants are used, the less side effects will be. The waterborne coating industry is looking forward to the emergence of high-efficiency surfactants with super dispersing ability.

With the rapid development of petrochemical industry, synthetic surfactant is a fine chemical industrial product rising together with synthetic resin, synthetic plastic, synthetic fiber, synthetic rubber and other industries. Surfactant has unique physical and chemical properties and is a "catalyst" applied in many disciplines and fields. The application of surfactant in aqueous paint paste can improve the production process Improving the construction conditions, improving the technical indicators and application performance of products, and giving products excellent functions have become an indispensable part of water-based paint paste. With the rapid development of coating industry, the requirements for multi variety and multi-functional surfactants are becoming more and more urgent, and the application prospect is broad.

The dispersion process of pigment particles in aqueous medium is the process of making pigment particles hydrophilic by using the characteristics of surfactants. In order to make the aqueous coupling process of pigment particles exist smoothly and permanently, it is also necessary to use a variety of additives with different properties, such as moisturizing agent, viscosity regulator, pH regulator, bactericide, etc., which coexist with the interaction of chemical structures of components, The normal physical and chemical properties of these additives are restricted. At present, it is not clear to explain all the mechanisms of side effects caused by the interaction of coexisting components caused by the difference of chemical structure between these additives. Therefore, scientific and technological personnel need to spend a lot of time on compatibility research, which is the most scientific The most direct solution is to replace the above components with as few additives as possible. The preparation not only has good wetting and dispersion effect, but also can play the functions of foam inhibition and defoaming by adjusting the surface tension and consistency of the system, such as super separation

The easily movable micelles formed by the powder in the oily system can quickly move to the surface of pigment particles and play the role of isolation and protection. It is inactive at the liquid-solid interface and can not reduce the surface tension of the system, so it will not increase the foaming of the coating. For another example, while synthesizing polymer surfactants, functional groups that can play the role of sterilization and mildew prevention are introduced for grafting or copolymerization, so that it can not only form a thick and dense stable adsorption layer between water-solid interface, but also protect the color paste of waterborne coatings from mold. Nowadays, multifunctional surfactants have been well used in oil-soluble coatings, and multifunctional surfactants suitable for water-solid system will be developed in the future.