Micronization is the development direction of styrene-a […]
Micronization is the development direction of styrene-acrylic emulsion. As a coating film-forming material, styrene-acrylic emulsion has been developed and produced at home and abroad, but there are still some problems: the lowest film forming temperature is high, the calcium ion stability is low, and the emulsion rheology, especially the viscosity, cannot be effectively adjusted; Compared with solvent-based coatings, latex coatings have poor drying properties, fluidity, durability, and film forming properties, making them a major barrier to solvent-based products. At the same time, high performance coatings require high strength, elasticity and adhesion, as well as outstanding weatherability, stain resistance, water resistance, acid and alkali resistance, good gas permeability and high gloss. These requirements are greatly limited. The development and use of styrene-acrylic emulsions has also pointed out a new direction for the development of styrene-acrylic emulsions.
The polymer latex is actually composed of polymer dispersed particles and an aqueous solution as a dispersion medium, and the properties of the film are affected by the degree of fusion of the polymer latex. If the emulsion particles are made into submicron particles of 1 micron or less, or even dispersed into a microemulsion, the function will be drastically improved, and even a special function can be obtained. Therefore, in order to form a film comparable to the density and gloss of the organic solvent type coating film, the micronization of the latex becomes a necessary condition. Therefore, the preparation of styrene-acrylic microemulsion with small particle size and narrow distribution is an important way to achieve high functionality of styrene-acrylic emulsion.