Paint common sense: what is the function of primer for interior wall finishing

Core tip: primer was rarely used in interior wall painting in the past With the entry of foreign products into China, the development of domestic construction technology and the improvement of people's living standards, the fashion of interior wall decoration, and the emergence of various dark color paint on the wall caused by the appearance of film blooming and other defects, which caused people's awareness of the importance of using interior wall primer The use of interior wall primer is increasingly common Interior wall primer is a key coating process in interior wall coating process The use of interior wall primer can make up for the deficiency of interior wall putty, which has strong alkaline effect on the performance of finish paint, and better play the function of interior wall paint In the meantime Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Paint Home News: primer was rarely used in interior wall painting in the past With foreign products entering China, the development of domestic construction technology and the improvement of people's living standards are driven Interior wall decoration is fashionable, and various dark color paints are used to brush the coating brought by the wall The appearance of flower and other defects has aroused people's awareness of the importance of using interior wall primer, which is increasingly used Interior wall primer is a key coating process in interior wall coating process The use of interior wall primer can make up for the deficiency of interior wall putty, which has strong alkaline effect on the performance of finish paint, and better play the function of interior wall paint At the same time, interior wall primer and interior wall paint belong to interior wall emulsion paint, with similar composition but different functions During the interior wall coating construction, attention must be paid to the matching of primer and finish paint, and the matching system and construction process recommended by the coating manufacturer shall be used as far as possible The functions of interior wall primer are as follows: (1) the base course of anti alkali sealing architectural coating is mostly cement mortar and mixed mortar plastering layer and putty layer, with high alkali content The water and alkali dissolved in it constantly migrate to the surface through capillary action, causing damage to the paint film The emulsion in water-based primer generally has strong permeability On the one hand, some pores are filled by permeation On the other hand, because the surface tension of the emulsion is low and the hydrophobicity is higher than that of the plastering layer, it reduces the water absorption and prevents alkali and salt from moving with water, which has a certain sealing effect Of course, the denser the filling, the lower the surface tension of the polymer, the stronger the hydrophobicity and the better the sealing effect However, it is also necessary to consider the recoating property and certain air permeability of the top coat (2) reinforce the base for the loose base and putty layer, use primer to treat it, then reinforce it by emulsion infiltration, then the wall paint can be built This is similar to impregnating concrete to improve its performance (3) reducing and balancing the absorbent putty layer of the base is usually relatively loose If the wall is painted directly, the emulsion particles in the topcoat will be sucked into the grass roots The remaining paint and fillers will be left on the surface to form a latex paint film with high pigment volume concentration (PVC), which will affect its quality Secondly, water absorption is too fast, which is not conducive to film formation In addition, uneven water absorption will result in uneven film thickness, and well may lead to color difference After the primer is applied, the performance of the finish coat can be guaranteed only when it is applied on a uniform and dense primer coating (4) It is the weakest link of the whole coating system to improve the adhesion of the top coat on the base layer Therefore, the adhesion becomes the basis of the protective and decorative functions of the coating The emulsion paint coating is mainly combined with the base layer through mechanical bite force and van der Waals force The primer can penetrate into the pores of the base course to a certain depth, thus producing a strong mechanical bite force and enhancing the adhesion When polishing the putty base surface, it is inevitable that there is dust on the base surface There shall be no dust when directly brushing the paint, otherwise it will seriously affect the adhesion, thus affecting the service life Primer can be used to reinforce the dust floating on the base surface due to grinding 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,