How do exterior wall coating construction in spring?

Spring is a transition between winter and summer season. Cold and warm air is very strong and active. This is one of the biggest changes in the weather year period, a sudden change from warm to cold temperatures, the temperature also suddenly change. The characteristics of the north from the north to the souther alternately, accompanied by strong winds. In general, may, after the frequent winds can be improved. The arrival of the strong wind brings the cold air, the temperature drops, the humidity drop. As temperatures rise, spring if precipitation decreased, but not long ago, the ground is dry, the wind dust weather comes easily. Every year in March and April is a period of frequent sandstorms. Early spring, the temperature difference is bigger ( 2 - Temperature can be in 5 to 3 days 23 ℃) fluctuations in 。 As a result of dry powder putty in under the environment of high and low temperature drying time is not enough, after the cement hydration reaction of dry powder putty will produce large amounts of alkaline substances. The putty layer high alkali content. If the application of outer wall surface coating and lamination products again, metope of coating film is not good, after film can't normal dry in a short time to achieve the membrane resistance, film forming time will be extended accordingly. Emulsion powder, sand and paint coating performance will reduce accordingly. At the same time, the spring rain frequently. After continuous wetting, in the process of the migration of the rain, the emulsioni paint and texture coating surface will form a vertical strip raindrops stain, results in uneven coating surface color or white. When a cause analysis: coating dry film, general customers will think there is something wrong with the emulsion for the first time, the construction time is 3 - Four days later, was already dry paint film surface. Causes of the problems include the coating drying time, low temperature film forming time and rainwater infiltration scour mark problem for a long time. Cause analysis 2: formula proportion adjustment formula of irrationality, whether meet the requirements of the powder coating formula of emulsion content, washes meets certain criteria; And corresponding film-forming additives added amount, regardless of the emulsion can completely film; Whether there is a lot of acid in the powder filler or paint. ( If the emulsion content is too low, considerably reduced resistance to paint film, the base material of alkali resistance and reduces) 。 Cause analysis, three: alkali process whether seal primer, whether is completely dry and uniform coating alkali resistant seal primer, and then coated on the surface of coating. If you can't base material enhancement and alkaline seal, it is easy to appear after the rain rain mark phenomenon. In order to save construction cost, some construction workers again and again with paint. The thickness of the film itself ( Meet resistance ordinary paint should be dry film thickness of about 90 - 120 microns) , the overall resistance will be reduced, easy to appear after the rain rain imprinting phenomena. Cause analysis, four: crack in the wall at the grass-roots level, moisture of walls or after the rain, new wall solidified alkali content is high, easy construction, wall body or wall bottom prone to raindrops imprint phenomenon. Construction advice: pay attention to the construction site conditions, construction environment and construction process. Pay attention to the compatibility between lubricious pink and paste and the resistance of paint used. Pay attention to the choice of emulsion and add and the quality of the film forming additives and adding. In construction of early spring, elastic emulsion has good resistance to the environment. Suggest customers to use some elastic emulsion to make the corresponding products. Pay attention to the rationality of the integral formula, early warning and prevention. Pay attention to control the paint drying time, to avoid the construction before it began to rain. If the customer urgent time limit, advising clients to join 15 - in the finished paint 20 kg/ton waterproofing agent. For the minimum temperature for 5 - in northern China Weather of 10 ℃, should as far as possible in the morning 10:00 to 16 in the afternoon: 00 to paint coating. If the temperature is too low, paint film will craze. Pay cl