The main function of the external wall paint is to decorate and protect the exterior wall of the building, so that the building looks beautiful and clean, so as to achieve the purpose of beautifying the urban environment. While the external wall paint can also play a role in protecting the external walls of the building to extend its service life. In order to obtain the ideal decorative and protective effect, the exterior water-based paint should have the following characteristics:

1, decorative good: the requirements of the external walls of water-based paint color and color retention is excellent, can be a long time to maintain the original decorative properties.

2, good weather resistance: the external coating, the coating exposed to the atmosphere, to withstand the wind, sun, salt spray corrosion, rain, cold and heat changes in the role of these external environment, the long-term repeated effects, Coating prone to cracking, chalking, peeling, discoloration and other phenomena, so that the loss of the original decorative coating protection. Therefore, the requirements of the outer wall in the specified service life, the coating should not occur the destruction of the phenomenon.

3, good stain resistance: due to differences in environmental conditions in different parts of larger, for some heavy industry, mining developed cities, due to the atmosphere of dust and other suspended substances, will make the stained coating loss of the original decoration Effect, thus affecting the appearance of the building. Therefore, the external wall paint should have good stain resistance, so that the coating is not easy to be contaminated or easily cleaned after contamination.

4, good water resistance: the exterior wall of water-based paint finishes exposed to the atmosphere, will often be washed by rain. Therefore, the outer coating of the coating should have good water resistance.

5, mildew resistance is good: the external walls of paint finishes in the humid environment easily. Therefore, coating is required to inhibit the growth of mold and algae.

In addition, according to the functional requirements of different design, the external walls of water-based paint also put forward higher requirements: such as in a variety of external wall insulation system coating applications, require external wall coating has better elastic elongation, to better adapt Due to the deformation of the primary surface of the surface cracking, the cracks on the grass-roots role in the cover; for the anti-aluminum decorative effect of the external walls of paint should also have a better metal texture, long outdoor durability.