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. Generally speaking, emulsions for exterior wall coatings have higher 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 must have Good weather resistance. In addition, external emulsions are also required to have excellent alkali resistance and water resistance. Because external walls generally do not need to scrape putty, but directly use the paint on the alkaline cement mortar or cement concrete mortar substrate, so the emulsion is required to have excellent alkali resistance. The coating film of the external emulsion should have high hardness, which is very important to improve the anti-pollution performance and keep the building clean. The emulsion for interior wall paint is used indoors, and the emulsion used only requires general water resistance and alkali resistance. There are special requirements for weather resistance. In short, emulsions for exterior wall coatings should consider water resistance, alkali resistance, mildew resistance, powdering resistance, pollution resistance, and anti-cracking properties at low temperatures more than internal emulsions.