Composite coating for resisting alkalization of wall surface

Abstract

The invention relates to the technical field of coatings and discloses a composite coating for resisting the alkalization of a wall surface. The composite coating contains a component A and a component B in a mass ratio of (5 to 1)-(6 to 1), wherein the component A contains the following components in percentage by mass: water-based nano-fiber, a thickening agent a, a foam inhibitor, a substrate wetting agent, a defoaming agent, a thickening agent b, an in-tank preservative and water; and the component B is an enhancer. In the construction process, the component A and the component B are mixedin a provided proportion and are uniformly stirred, and the mixture can be used for directly brushing the surface of a coating layer, so that the alkalization phenomenon of the wall surface can be effectively solved, and the problems of fading, dimming and the like of the wall surface caused due to the alkalization of a wall body are prevented; and besides, the invasion of moisture can be prevented, and the abnormal phenomena of falling, peeling and cracking of a pain film caused due to the long-term soaking of the wall body in water are reduced, so that the wall surface has certain antifouling property and self-cleaning property, and the coating is a multifunctional composite coating layer which is relatively easy to construct and capable of fundamentally solving the alkalization of thewall body.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a composite coating resistant to efflorescence on walls and a preparation method thereof. Background technique [0002] After the construction of interior and exterior wall coatings, the phenomenon of pan-alkali on the wall has always been a major problem for construction workers. Pan-alkali will cause discoloration and fading of the paint film, and strong alkaline substances such as silicates will appear on the surface, which will make the putty and coating last for a long time. Corrosion by alkaline substances not only affects the appearance of the building but also involves safety issues such as wall coating peeling off, which has a huge impact. [0003] The cause of efflorescence on the wall is that the alkalinity of the cement base, base material or putty is too high. The CO2 gas in the atmosphere diffuses into the pores, and with the calcium silicate salt with strong alka...

AI Technical Summary

Problems solved by technology

For example, to reduce the alkalinity of the wall: ensure that the pH value of the new wall base material is less than 10, and use 10% oxalic acid solution to wash the highly alkaline wall surface; but the process of this solution is complicated and can only temporarily relieve the occurrence of efflorescence, and it will not last for a long time. It doesn't seem to be able to eliminate the ubiquitous alkaloid problem

Reduce the alkalinity of the putty layer: use anti-efflorescence putty material, but this kind of putty is not high in alkalinity, and requires high hardness and water resistance, which can reduce the alkalinity of the wall and reduce water infiltration

Moreover, the various methods for preventing wall surface efflorescence in the prior art have higher requirements on the materials in the construction link, regardless of the high alkalinity of the cement base, putty, or finish paint, or poor waterproof performance may lead to actual application effects Poor, virtually increases the cost of engineering materials and construction

On the other hand, the above two treatment methods are the treatment of the base material layer, because the bottom layer construction is a concealed project, which brings great difficulties to the controllability of Party A and the supervisor

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