The main function of exterior wall coating and the selection criteria

Exterior wall coating is mainly have the effect of decoration and protection of outer wall surface, require good decorative, water resistance, weather resistance, resistance to polluting maintainability and easy construction. ( 1) Good decoration. Exterior wall coating color rich, good colour retention, adornment sex is good for a long time. ( 2) Good water resistance. Outer wall surface is exposed to the atmosphere, often be washed off. Therefore, as the exterior wall coating, it should have good resistance to water. When there are small cracks foundation wall coating still have waterproof function. ( 3) Good weather resistance. The coating should be exposed to the atmosphere by the sun, rain, wind, cold, etc. In the natural force under the action of repeated, common coating will appear crack, flake, powder removal, color change wait for a phenomenon. So the coating will lose its original decoration and protection function. Therefore, as external wall decorative coatings, within the prescribed time, no damage, which should be with good weatherability. ( 4) Good ability to resist pollution. Dirt and other material from the atmospheric pollution after coating, the coating will lose its adornment effect, therefore requires external wall decoration coating is not easy to be easily removed after these substances pollution or contamination. ( 5) Easy construction and maintenance. The area is large, exterior walls require simple exterior wall coating construction. Coating at the same time, in order to keep good decorative effect, need regular cleaning, painting and other maintenance operations, the need to painting. Commonly used coating including styrene acrylic emulsion coatings, acrylic ester exterior wall coating, polyurethane exterior wall coating, synthetic resin emulsion sand wall paint, etc.