What are the different requirements for emulsions for interior and exterior wall coatings?

Due to the different indoor and outdoor environments, there are great differences, and there are also different requirements for paint emulsions.

In general, emulsions for exterior wall coatings have higher performance requirements than those for interior wall coatings, because exterior wall coatings are often exposed to sunlight, wind and rain. In order to maintain a certain degree of durability, the emulsion is required Has good weather resistance. In addition, external emulsions are also required to have excellent alkali resistance and water resistance. Because the coating is directly used on the alkaline cement mortar or cement concrete mortar substrate, even if the putty is applied, most of it is cement-based exterior wall putty, so the emulsion is required to have excellent alkali resistance. The coating film of the external emulsion should have a higher hardness, which is very important to improve the stain resistance and keep the building clean. As interior wall coatings are used indoors, the emulsion used must meet environmental protection requirements. In addition, they also require good water resistance, alkali resistance, and scrub resistance. There are no special requirements for weather resistance. In short, emulsions for exterior wall coatings should consider weather resistance, stain resistance, water resistance and alkali resistance more than those used for interior wall coatings.