What is the reason why the exterior wall paint will turn white when it encounters rain?

If it is caused by the whitening caused by the emulsion not completely drying, this is the initial water-resistant whiteness of the lotion, and when the temperature rises, the whitening will automatically recover; If you need to restore the original color quickly, try applying the topcoat roller or spraying it once the exterior paint has dried.

Summary. The exterior wall paint was rained why is it whitish Hello dear, <> one: the quality of the emulsion is low:

Now on the market, there are many manufacturers of real stone paint, and customers will accidentally buy low-grade real stone paint, these low-grade real stone paint often in order to increase the stability of the emulsion, add excessive surfactants, thereby greatly reducing the water resistance of the emulsion. 2: The amount of emulsion is too low

In order to save costs, some real stone paint manufacturers only add a small amount of proportional emulsion, so that the quality of the exterior wall real stone paint is reduced, the paint film is loose and not dense enough after drying, the water absorption rate of the paint film is relatively large, and the bonding strength is also reduced accordingly. Three: Excessive thickener:

Some real stone paint manufacturers will add a large number of thickeners when manufacturing real stone paint, and these substances are water-soluble or hydrophilic, which will greatly reduce the water resistance of the real stone paint layer on the exterior wall. Hope it helps!

Good. The exterior wall paint was rained why is it whitish Hello dear, <> one: the quality of the emulsion is low:

Now on the market, there are many manufacturers of real stone paint, and customers will accidentally buy low-grade real stone paint, these low-grade real stone paint often in order to increase the stability of the emulsion, add excessive surfactants, thereby greatly reducing the water resistance of the emulsion. 2: The amount of emulsion is too low

Some real stone paint manufacturers in order to save the cost of the belt, only add a small amount of proportional emulsion, so that the quality of the exterior wall real stone paint quality is reduced, after drying the paint film is loose, not dense enough, the water absorption rate of the paint film is relatively large, and the bonding strength is also reduced accordingly, once the rainy weather is encountered for a long time, it will lead to the whitening of the exterior wall real stone paint. Three: Excessive thickener:

Some real stone paint manufacturers will add a large number of thickeners when producing real stone paint, and these substances are water-soluble or intimately know the water nature of the reed, which will greatly reduce the water resistance of the real stone paint layer on the exterior wall. Hope it helps!

I asked about the exterior wall latex paint.

One: the quality of the emulsion is low: now on the market, the manufacturers of real stone paint can be said to be more, and customers will accidentally buy low-grade real stone paint, these low-grade real stone paint often in order to increase the stability of the Omori emulsion, add excessive surfactants, thereby greatly reducing the water resistance of the emulsion.

Second: the amount of emulsion is too low: some real stone paint manufacturers in order to save costs, only add a small amount of proportion of emulsion, so that the quality of the exterior wall real stone paint quality is reduced, after drying the paint film is loose, not dense enough, the water absorption rate of the paint film is relatively large, and the bonding strength is also reduced accordingly, once it encounters rainy weather for a long time, it will lead to the whitening of the exterior wall real stone paint.

Three: excessive thickener: some real stone paint manufacturers will add a large number of thickeners when producing and manufacturing real stone paint, and these substances belong to the water cavity imitation solubility or hydrophilic Wu Wei, which will greatly reduce the water resistance of the real stone paint layer of the exterior wall.

That's why.

The exterior wall is sprayed with real stone paint and rolled with light paint, what is the reason for the whitening of the wall after rain?

Hello, happy to answer your questions. The reasons for the whitening of the wall after rain can be the following: Paint selection problem:

If the real stone paint or varnish used is of poor quality or unsuitable for exterior wall use line leaks, they may not be well protected from rain and moisture. Under the influence of rain, the paint on the wall may be eroded or damaged, resulting in a whitening of the wall. The paint is not compatible with the wall:

Compatibility between wall materials and coatings is also an important factor. If the paint is not compatible with the wall material, for example, the wall contains some components that may react with the paint, which will cause the paint to turn white after rain. Moisture Problem:

Rainy weather may cause the walls to absorb more moisture. If the wall is not well protected from moisture or waterproofing, moisture may penetrate under the paint and cause the wall to whiten. Paint film aging:

If the paint on the wall has been around for a while, the paint film may deteriorate and the bad holes may suffocate. This can lead to a thinner paint layer that is susceptible to rain, which in turn can cause the wall to whiten.

First, the reason for the real stone paint material itself.

On the one hand, due to the fact that these coatings are thicker, they have a relatively longer drying time compared to thin coatings. If it is not completely dried after the construction of the project, it will produce whitening phenomenon when it rains, making the whole finish bloom; On the other hand, because the real stone paint is to use synthetic resin emulsion to adhere the aggregate together, therefore, the requirements for the water resistance of the emulsion are higher than that of general types of coatings. Therefore, when formulating real stone paint, it is necessary to choose an emulsion with excellent water resistance.

Second, the real stone paint construction error.

Before the construction of real stone paint, it is necessary to check whether the base surface is completely dry, and its moisture content can not be greater than 5%, when the base surface of real stone paint construction is not dry, it will cause a large amount of alkali in the cement layer to seep out, which will cause the real stone paint to be white, and the color to change!

The whitening of the coating film is mainly caused by the water absorption of the emulsifier, which has the greatest impact on the color, but the coating film without whitening cannot be said to be without water absorption, but the emulsifier does not absorb a lot of water and whitens.

There is also a certain relationship between water resistance and whitening of the coating film, although some coating films are not whitened, but they will also cause poor water resistance of the paint film. The key is to see the adhesion and wrapping of this resin to the powder.

Therefore, while determining the quality of the emulsion, on the one hand, it is necessary to do the test of water white resistance, and on the other hand, it is necessary to do the scrub resistance test of the coating film.