How much do you know about the progress of lotion polymerization technology?
Published：
2022-12-07 18:49
As early as the 1930s, lotion polymerization technology has been applied to industrial production. At present, lotion polymerization has become an important field of polymer science and technology, and one of the important methods to produce polymers. The cost of lotion polymerization is relatively low. The lotion synthesized by this method has good water dispersion. According to the different monomers, the lotion can obtain good heat resistance, weather resistance, corrosion resistance and pollution resistance after film forming.
Soap free lotion polymerization to improve water resistance of coating film
In order to stabilize and nucleate the system, emulsifiers should be added in the traditional lotion polymerization. However, the emulsifier will not become part of the film when the lotion forms the film, but will be free in the film. Because of its hydrophilic effect, it will affect the water resistance of the film, limiting its application. In order to overcome the drawbacks caused by the addition of emulsifiers, people are committed to developing soap free lotion polymerization technology.
Reactive emulsifiers not only have emulsifying properties, but also contain reactive functional groups in their molecular structures, such as polymerizable emulsifiers containing double bonds, surface active initiators containing azo or peroxide structures, and surfactant chain transfer agents. It can be added to the reaction system as a component of the polymerization system for polymerization, and anionic, cationic or non-ionic hydrophilic groups are introduced into the polymer molecular chain to endow the polymer with self emulsifying ability.
Core shell lotion polymerization to enhance the performance of lotion
At present, the main structural designs are hard core soft shell, soft core hard shell and interpenetrating network. According to the different adding methods of shell monomers, the research mainly focuses on batch method, semi continuous method and pre swelling method. These three different polymerization processes will directly affect the morphology of lotion particles. The latex particles with normal core-shell structure, strawberry type, sandwich type, snowman type, overturned type and island type can be obtained.