The wall paint says it is resistant to alkalizing, what does alkalization mean?

The alkali resistance of the coating refers to the resistance of the paint film to alkali attack. If you need wall paints, we recommend Taysel. The texture wall membrane board launched by Taysel is a new field, and the road ahead is full of unknowns, but the spirit of challenging oneself and opening up new fields is the source of motivation for Taysel's continuous development.

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Because the alkali on the wall will cause problems such as yellowing of latex paint, peeling and peeling, and loose walls, it will seriously shorten the life of the wall, and people will be exposed to ablation**, allergies and other symptoms. For the sake of health, it is necessary to do the anti-alkali and alkali removal work of the wall.

The skin layer of the inner wall is the cement plastering layer, putty layer and topcoat layer from the inside to the outside, and the core part of the wall anti-alkali and alkali removal work is the cement plastering layer and the putty layer.

Alkali production of cement wall paint is a common problem in our decoration. It will affect the aesthetics of the wall and will also affect the adhesion of the paint. So, what should we do when the cement wall paint is alkaline?

First of all, we need to understand the cause of the alkali of the paint. Alkaline reactions in coatings are usually caused by a high pH on the surface of the substrate, which exceeds the alkali resistance of the paint. The pH value of cement mortar is generally about 10, and the water permeability of the wall is good, which can allow carbon dioxide in the air to penetrate into the cement surface and form alkalinization.

Next, there are several ways we can take to address this problem:

1.Scrape off the alkaline powder with a manual brush.

If it is only the case that the alkali powder is light, we can directly use a broom and brush to scrape off the alkali powder and peeling paint on the surface, and clean it with water. This removes some of the alkali powder, but this method is not effective for heavier alkali powders.

2.Formaldehyde cleaner cleaning.

Using formaldehyde cleaner or professional caustic detergent can remove alkali powder from the wall. Before use, you need to clean the wall, then soak the celery positive cleaner on the wall, wait for a period of time and then rinse it with water.

3.Use an alkali-resistant primer.

If the alkali powder on the wall is more serious, we can first use an anti-alkali primer to form a barrier film on the surface to prevent the alkaline substance from reacting with the paint, and then apply the paint we want.

4.Replace with better quality paint.

If the problem is still not resolved, we need to consider replacing it with a high-quality coating. Choosing a better quality coating avoids this alkaline reaction and is more durable.

In general, the alkali of cement wall paint is a relatively common problem, but as long as we use the right method in time, we can avoid affecting the beauty of the wall and the durability of the coating.

The main reason for the anti-alkali of the wall, commonly known as cement frosting, is that the cement product calcium hydroxide reacts with carbon dioxide in the atmosphere to generate calcium carbonate and deposit it on the surface of concrete products; Or: in a solution of calcium hydroxide, a hydration product, when the water evaporates, the calcium hydroxide crystallizes in the cracks of the concrete and gathers on its surface. In addition, limestone or building sand contains a certain amount of soluble alkali-containing organic matter, and the hydroxide, carbonate or other alkali salt solutions formed by them can easily and quickly seep out "frost salts" on the concrete surface and frost.

Measures to prevent frosting: Anything that can reduce the concentration of calcium hydroxide, a cementification product, should reduce the degree of frosting. Fly ash has a certain effect on mixed materials. The effect of mixing a certain anti-frost agent is also good.

How to properly deal with the alkali on the wall, oxalic acid brushes the wall to neutralize the alkaline wall to achieve the most ideal effect!

If there has been a phenomenon of alkali return, you can spray the alkali return agent of the exterior wall bricks to the joints of the wall bricks to remove the alkali return phenomenon of the wall tiles, and form a layer of breathable and waterproof protective film to prevent the alkali return phenomenon.

1. If it is only the phenomenon of alkali return on the surface, it is mainly caused by the poor compactness of the material inside the material and the easy absorption of water. When the material contains alkaline impurities that are chemically unstable, salts, such as carbonates, will form when it encounters acid rain, and white crystals will appear on the surface after the water evaporates.

2. If it is permeable crystallization, it is mainly caused by the high water absorption rate of the exterior wall material, some water-soluble chemicals will be immersed in the stone through the capillary tube in the stone, through the water as the carrier, the micropores of the surface material as the channel, the water, alkali, salt and other substances in the bonding material infiltrate and precipitate, after the water evaporates, the white saline-alkali crystals will stay on the surface of the stone, and the alkali return phenomenon occurs.

The by-products of the reaction of the cement mortar surface are some water-soluble alkali salts, such as calcium sulfate, sodium sulfate, etc., which will follow the moisture escaping from the wall and react with carbon dioxide in the air to form a white substance (alkaline), commonly known as cement.

With the continuous improvement of people's living standards, more and more people pursue high-end quality life, the architectural style is becoming more and more strange, and the use of exterior wall coatings is becoming more and more extensive. However, one of the common drawbacks of exterior paints is the whitish fading. We call it panthenium for short.

Too many exterior wall paints are colored paints, especially those with organic pulp, such as carbon black, titanium blue, organic synthetic bright yellow, and bright red. When encountering alkaline substances, it can quickly change color, causing the coating to become light and white. If there is a large amount of unpolymerized cement or lime in the base layer (mortar plastering layer) and putty layer, in the rainy season, rainwater will rush into the putty layer and base layer, and on sunny days, water vapor will carry these alkaline substances to the coating, forming a layer of white substance on the surface.

At the same time, due to its high alkalinity, the pigments in the coating undergo discoloration and fading. This is the real reason for the coating pan alkali. In order to prevent this from happening, it is necessary to prevent alkaline substances from penetrating into the paint layer.

The solution to the alkali of exterior wall paint: 1. Reduce or eliminate the alkalinity of the base layer and putty layer, and control its risk below 10, if the speed of sound reaches 8, it is more ideal. Here's how:

1.Eliminate alkalinity of the base layer. Mainly by the maintenance of the mortar plastering layer.

If you can water it 34 times so that the cement is completely polymerized, the alkalinity will decrease rapidly. If there are no watering conditions, relying on natural rainfall and natural aggregation, the drying time will be longer. At least 20 days (maybe more than 30 days in winter), therefore, watering and curing the mud plastering layer is the best way to reduce alkali.

Of course, the choice of cement is also very important, choose a qualified cement as a basis. 2.Eliminates the alkalinity of the putty layer.

The main principle is to choose high-quality leveling putty, which is not only hard and water-resistant, but also not alkaline (afraid of 10). The key is to increase the amount of binder (latex) in the putty and reduce the amount of cement. At the same time, the putty should be watered 12 times in time after construction, so that the cement in the putty layer can be completely polymerized and hardened, and the weathering ratio should be reduced.

Some low-end putty (less than 1,000 yuan tons) on the market completely rely on cement to improve the cohesion, and do not maintain it in time in the rain, resulting in more than 100,000 yuan (part of the proportion of 14), which will definitely appear pan alkali. 2.It is the current symptomatic treatment method to choose a primer with good sealing (water-based sealing primer) to penetrate and seal the base layer and putty layer, so that it is difficult for alkaline substances to penetrate into the coating with water vapor.

However, if the penetration and sealing of the base paint is not good or the base paint has too much alkaline substance (weathering), there will still be a pan alkali phenomenon, and the base paint must be better permeable, and the primer emulsion has fine particle characteristics and low viscosity (but suitable for construction). So under normal circumstances, a clear primer is better than a white primer. Of course, choosing an emulsion with small particle characteristics and good occlusivity is key.

That's a precipitation of calcium carbonate.

The main reason for the alkali return of the wall is that the cement product calcium hydroxide reacts with the carbon dioxide in the atmosphere to generate calcium carbonate and deposit it on the surface of concrete products. The main cause of anti-alkali is that the chemical substances (calcium hydroxide) in the wall decoration paint react when they encounter air, thus forming the phenomenon of "salt frost". Because the bricks and tile materials need to be soaked in water before decoration, and if the wall is not dry during construction, the next construction will be carried out, and with the evaporation of water, the material may precipitate alkali salts, which also forms what we call wall anti-alkali.

The situation is even more severe in humid environments.

The main reason for cement alkali is that the cement product calcium hydroxide reacts with carbon dioxide in the atmosphere to generate calcium carbonate and deposit it on the surface of concrete productsOr: in a solution of calcium hydroxide, a hydration product, when the water evaporates, the calcium hydroxide crystallizes in the cracks of the concrete and gathers on its surface. In addition, limestone or building sand contains a certain amount of soluble alkali-containing organic matter, and the hydroxide, carbonate or other alkali salt solutions formed by them can easily and quickly seep out "alkali salts" on the surface of concrete and form alkalis.

Measures to prevent alkali formation: any substance that can reduce the concentration of calcium hydroxide in cementification products should be able to reduce the degree of alkali formation. Fly ash has a certain effect on mixed materials. The effect of mixing a certain anti-alkali agent is also good.

Are you asking about earthen walls?It should be sodium carbonate, and the most in many soils is sodium carbonate, especially in the original saline-alkali soil.

The Jane that appears on the wall is the impurity in the paint you paint the wall.

Summary. Dear, hello, is the same product, full name: anti-alkali sealing primer.

1.The alkali-resistant sealing primer coating has super adhesion to concrete, outstanding alkali resistance and sealing performance, and has good matching properties with a variety of floor coatings and protective coatings for concrete structures.

2. The alkali-resistant sealing primer is used as a protective sealing primer for concrete substrates.

Do wall anti-alkali primers and anti-alkali sealants work the same?

Dear, hello, it is the same product of Tangerine, full name: anti-alkali sealing primer. 1.

The alkali-resistant sealing primer coating has super adhesion to concrete, outstanding alkali resistance and sealing performance, and has good matching properties with a variety of floor coatings and protective coatings for concrete structures. 2. The anti-alkali sealing and sealing primer is used for the concrete substrate as a circular protective sealing primer.

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The reasons for the alkali of exterior wall architectural coatings are as follows:

Too many exterior wall architectural coatings are colored paints, especially those with organic color paste, such as carbon black, titanium blue, organic synthesis bright yellow, and bright red, which will soon change when they encounter alkaline substances, causing the color to disappear and make the coating lighter and whiter. If the base layer (mortar plastering layer) and putty layer contain a large amount of unpolymerized cement or lime, the rainwater will pour into the putty layer and the base layer when it rains, and the water vapor will bring these alkaline substances to the coating after the weather is clear, forming a layer of white substance on the surface, and at the same time, the pigment in the coating will change color and fade due to its high alkalinity. This is the real reason for the coating pan alkali.

To prevent this from happening, it is necessary to prevent alkaline substances from penetrating into the paint layer.

The solution to the alkali of exterior wall architectural coatings:

1. Reduce or eliminate the alkalinity of the base layer and putty layer, so that its pH value is controlled below 10, if the pH reaches 8, it is more ideal, which is a way to cure the root cause. Here's how:

1. The elimination of alkalinity of the base layer is mainly the maintenance of the mortar plastering layer, if it can be watered 3-4 times to make the cement completely polymerized, its alkalinity will decline quickly. If there are no watering conditions, relying on natural rain and natural polymerization, the drying time will be longer, at least more than 20 days (it may be more than 30 days in winter) Therefore, the watering and maintenance of the mortar plastering layer is the best way to reduce alkali. Of course, the choice of cement is also very important, and the selection of qualified cement is the foundation.

2. The main way to eliminate the alkalinity of the putty layer is to use the best leveling putty, which has good hardness and water resistance, but the alkalinity is not high (pH value less than 10), the key is to increase the amount of adhesive (latex) in the putty, reduce the amount of cement, and at the same time the putty should be watered 1-2 times in time after the construction of the putty, so that the cement in the putty layer can be completely polymerized and hardened, so that the pH value can also be reduced. Some low-end putty (less than 1000 yuan tons) on the market completely rely on cement to improve the adhesion, and there is no timely rain maintenance, resulting in a pH of more than 10 (some up to 14), this situation will definitely appear pan alkali.

Second, the selection of a good sealing primer (water-based sealing primer) to penetrate and seal the base layer and putty layer, so that the alkaline substance is difficult to penetrate into the coating with water vapor, which is a method of treating the symptoms. However, if the primer penetration and sealing is not good or the alkaline substance of the base putty is too much (pH>10), there will still be a pan alkali phenomenon, to make the primer better penetration, the primer emulsion particle characteristics should be fine, and the viscosity should be low (but it should be suitable for construction), so under normal circumstances, the transparent primer is better than the white primer, of course, the selection of small particle signs, good sealing emulsion is the key.