General knowledge of coating: requirements of emulsion paint construction on Wall

Core tips: there are often some problems in the construction of latex paint: peeling, peeling; alkali, flower; powder, yellow, etc In fact, no matter how good the emulsion paint is, to achieve the expected effect, it depends on two important factors: good wall, correct treatment and construction The condition of the wall before painting is one of the important bases for painting latex paint, which directly affects the adhesion, decoration and service life of the coating First of all, the humidity of the wall should not be too high Generally, it is required that the wall humidity of emulsion paint construction should be less than 10% (also the coating manufacturer's requirement is less than 6%) If the humidity is too high, on the one hand, the water in the pores of the wall will be blocked Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Paint Home News: there are often some problems in the construction of latex paint: peeling, peeling; alkali, flower; powder, yellow, etc In fact, no matter how good the emulsion paint is, to achieve the expected effect, it depends on two important factors: good wall, correct treatment and construction The condition of the wall before painting is one of the important bases for painting latex paint, which directly affects the adhesion, decoration and service life of the coating First of all, the humidity of the wall should not be too high Generally, it is required that the wall humidity of emulsion paint construction should be less than 10% (also the coating manufacturer's requirement is less than 6%) If the humidity is too high, on the one hand, the water in the pores of the wall will block the penetration of the primer and affect the adhesion of the paint film; the continuous evaporation of water will cause the paint film to bubble and fall off On the other hand, the alkalinity of the new wall is generally large, especially the lime paste wall When the water inside the wall evaporates outwards, it will bring the alkalinity of the wall to the surface, and the concentrated alkalinity frost after the water evaporates will gather on the wall surface, which will cause great damage to the color and luster of the paint film Secondly, the wall should not be too alkaline It is generally required that the basic pH value of emulsion paint construction wall should be less than 10 The new concrete, cement mortar and lime mortar walls are alkaline Pay special attention to lime mortar wall At present, some areas in Hebei Province are still using pocketed lime walls There are two stages in the formation of lime wall: the first stage is before plastering, that is, the hydrated lime is hydrated by adding water: Cao + H2O → Ca (OH) 2 ↓ the reaction is exothermic, volume expansion and slow It takes more than 15 days at 15 ℃ If the curing time is not enough and the reaction is not complete, the quicklime particles contained in the lime paste will absorb the moisture in the air, and the curing expansion will make the plastered wall burst Any paint applied on such walls will peel and peel off In the second stage, after plastering, the lime paste will undergo the process of hardening with water evaporation and carbonization: Ca (OH) 2 + CO2 → CaCO3 ↓ + H2O, as the water in the wall will be discharged during carbonization, the reaction is also very slow Under normal circumstances, it takes 9-12 months (preferably the whole summer) for the lime wall to be carbonized to the extent that it can be painted Before this, if the wall humidity is high, even if the alkali resistant primer is applied, it can not achieve satisfactory results Sometimes it will cause the phenomenon of efflorescence, flower and powder falling In a word, there are many factors that affect the effect of emulsion paint, the most important is that the wall should meet the requirements Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,