How to solve the problem of exterior wall coating whiskering?

With the continuous improvement of living standards, more and more people pursue high quality life, architectural style is more and more strange, exterior wall coating application is more and more widely. Exterior wall coating whitening and faded, however, is the most common disease in coating industry. Exterior wall coating present a weathering and faded, this is the most destructive effect of external wall decoration. After the heavy rain, the color of the paint often becomes white, wrinkles, even disappear even paint film ( Especially the gray and blue) 。 Production speed quickly, the above problems often occur during construction of the late or sales. The cause of the exterior wall coating whiskering exterior wall coating are mostly color coating, especially organic paste coating, such as carbon black, titanium blue, organic ChengLiang yellow and red. When they meet with alkaline substances, which can quickly change, disappear in color, make the coating becomes more bright and white. If primary ( Mortar plastering layer) And putty layer contains a lot of polymerization of cement or lime, rain when it rains will go into putty layer and the base, the weather cleared up the alkaline material to the coating, water vapor on the surface to form a layer of white matter. At the same time, the coating of paint will due to its high basicity and discoloration and fade. This is the real reason for coating high alkalinity. In order to prevent it happening, alkaline substances shall not penetrate into the coating. Exterior wall coating whiskering solutions to reduce or eliminate the basicity of grassroots and putty layer 1. Grassroots basicity of eliminating mainly for the maintenance of mortar plastering layer. If the cement by adding water 3 - 4 times completely polymerization, the alkalinity will reduce rapidly. If there is no water conditions, rely on natural rain and natural aggregate, the drying time will be longer, at least more than 20 days ( Winter may be more than 30 days) 。 Therefore, mortar plastering layer water conservation is the best method to reduce alkali. Of course, the choice of cement is also very important. The selection of qualified cement is the foundation. 2. In order to eliminate the basicity of the putty layer, mainly choose good quality leveling putty. The putty has good hardness and resistance to water, but the basicity is not high, Ph value is less than 10) 。 The key is to increase the adhesive putty ( Latex) The quantity, to reduce the amount of cement. At the same time, after construction water 1 - in a timely manner 2 times, make the putty layer completely polymerization hardening of cement, thus reducing the ph. Some low-end putty on the market ( Below 1000 yuan/ton) Depend entirely on the cement to improve the bonding strength, in the rain can not cured in time, lead to acid-base value reached more than 10 ( Some 14) , which will surely lead to flooding. Use closed good primer penetration and seal at the grass-roots level and putty layer, makes it hard for alkaline substances by water vapor permeation into the coating. This is a temporary solution. However, if the primer permeability and poor sealing, or too much primer containing alkaline substances ( PH10) , still can appear high alkalinity phenomenon. Better penetration, in order to make the paint primer of emulsion particle size should be fine, low viscosity should be ( But should be suitable for the construction) 。 Therefore, under normal circumstances, transparent primer is better than white primer. Of course, choose the emulsion particle size small, sealing is the key.