First, what are the treatment methods for alkali return on the inner wall? Treatment method of returning alkali to inner wall 1. Brush the alkali wall with a hard brush first, and brush it several times (remember to use dry brush instead of water cleaning) before cleaning.
Alkali return treatment of inner wall II. When brushing putty for the first time, it is best to use exterior wall waterproof coating, that is, white cement putty powder mixed brushing.
3. Subsequent processes can be carried out according to the normal procedures of painting work.
4, you can use dry paint to avoid wet paste, and then waterproof. Waterproof material is coated on the base of cement or cement gypsum, and then bonded with alkali-free glue.
5. The alkali on the back of the wall is crystallized from the salt in the wall material when it meets water or moisture. It is still impossible to completely deal with it. It is recommended to keep the room ventilated and dry after renovation. Avoid returning to the alkali wall.
Second, what is the reason for the alkali return on the inner wall? 1. If only the surface returns to alkalinity, it may be because the density of the substance in the substance is low, resulting in most of the water being absorbed. When the substance contains alkaline impurities with unstable chemical properties, if it rains at this time, it will form salts, such as carbonate, and white crystals will appear when water evaporates, which is alkali recovery.
2. Infiltration and crystallization are mainly caused by excessive absorption of water by the outer wall material. At this time, chemicals dissolved in water may penetrate into the wall through small holes in the wall. The pores of the surface material are channels, and substances such as water, alkali and salt in the bonding material can permeate and separate out. After the water evaporates, white salt alkaline crystals will remain on the wall, and the wall may return to alkali at this time.