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Elastic coating is a new type of functional architectural coatings at home in recent years new development and application is increasing rapidly, mainly used for coating the exterior wall of the building, except with landscaping, decorative and protective effect, also has a shield wall cracks, prevent moisture penetration into the wall leakage effect.
The development and application of elastic coating is infiltration phenomenon and the outer wall surface generally exist closely related. The exterior wall of buildings to use more concrete, cement precast slab or cement base block material for building. The wall before the surface coating of architectural coatings, most is to cement mortar leveling, with cement mortar or cement paste plaster. Cement is a kind of porous material with inorganic brittle, because of its low tensile strength, and from moist state to dry state due to dehydration and almost inevitable volume shrinkage and other reasons, often leads to mortar plastering layer cracking, and this is the performance of its inherent defects.
In addition, when the influence of wall cement base affected by changes in temperature, alternation of wetting and drying, freezing and thawing cycles and other environmental factors, often cracks. The harm of cracks on the structure that, when the erosion of moisture, moisture will penetrate to the cracks in the wall and to penetrate through the cracks. If subjected to freeze-thaw damage, will produce more cracks or cracks in the harm becomes more serious. For example, there may be caused by corrosion of steel bar inside the concrete, accelerate the carbonation of concrete etc.. In serious cases, the water also to building internal penetration and even affect the use of the building function. Therefore, the external walls of buildings leakage is considered to be a common buildings.
Wall leakage will cause adverse effects on the wall decoration. Wall leakage, water infiltration to the wall base, soluble salt, the alkali and other substances, these are dissolved substances with the moisture migration and diffusion to the surface, water evaporation after they left on the surface, the color coating color or other decorative materials, these remaining material will produce irregular "white" or non-uniform pollution, commonly called "alkaline", "surface bloom" is a more common facing disadvantages.
