What kinds of emulsions are commonly used in interior and exterior wall coatings? How to choose

1) Vinyl acetate copolymer emulsion Although vinyl acetate emulsion can be used to formulate interior wall coatings, it is basically not used in architectural coatings due to some inherent defects. However, vinyl acetate can be copolymerized with many other monomers to make various emulsions, many of which are copolymerized with acrylates as internal plasticizing emulsions, which greatly improve their performance, and are mostly used in the manufacture of interior wall coatings.

(2) Vinyl acetate and ethylene are copolymerized to form VAE° emulsion under pressure. The internal plasticizing effect of ethylene is very high. As a comonomer, ethylene has a significant anti-hydrolysis effect, which can improve the water resistance and alkali resistance of the copolymer emulsion. This emulsion is mainly used for internal use, and is generally rarely used for external use, because the coating film formed by using it to prepare coatings is relatively soft and does not meet the requirements for stain resistance.

(3) Polyacrylate emulsion This type of emulsion has many advantages, such as strong adhesion to pigments, good water resistance, alkali resistance, and light resistance, and good workability. Polyacrylate emulsion is mainly used for external latex coatings. Some polyacrylate emulsions have good elasticity and elongation properties, and are especially suitable for use in occasions where the temperature changes drastically and the expansion coefficient is very different, and can better solve the problem of fine cracks in the wall base layer.

(4) Acrylate copolymer emulsion has many varieties of acrylate monomers, most of which can be copolymerized, but the price is relatively high. Acrylate monomers can also be copolymerized with other monomers (such as styrene, etc.). Although some properties of the styrene-acrylic emulsion prepared by using styrene instead of methyl methacrylate as the hard monomer are lower than that of pure acrylic emulsion, the cost can be greatly reduced, and the performance can still meet the requirements of exterior architectural coatings. Requirements, it is one of the main varieties of internal and external emulsions.

Internal emulsions are not suitable for external use, but external emulsions can be used internally.