For home decoration, the use of wall materials can be a very important part. However, there are many owners who think that the quality of the topcoat can be good without using a primer. In fact, this idea is wrong because the topcoat and the primer have different functions. The topcoat is more focused on the final decoration and appearance, and the primer. It focuses on improving adhesion, anti-corrosion function, anti-alkali, etc. The two are complementary and indispensable. Next, Xiao Bian will explain to you what is the primer and the role of the primer which is related to the relevant knowledge, unclear friends can see Oh!
What is a primer
Primer is a kind of paint that can be directly applied to the surface of the object as a solid foundation for the top coat. It is the first layer of the paint system and is mainly used to improve the adhesion of the top coat, increase the fullness of the top coat, and provide resistance. Alkalinity, anti-corrosion function, etc. At the same time, the primer can ensure uniform absorption of the topcoat so that the paint system can exert its best effect. According to coating requirements, the primer can be divided into a primer, a primer, and the like.
Primer advantages
1, primer adhesion, with a strong penetration ability.
2, the primer is strong in alkali resistance, preventing the wall from returning to alkali powder.
3, the primer is very resistant to water, so that the wall is always dry.
4, primer can effectively prevent mold and algae, excellent performance.
5. The primer can save the topcoat and enhance the adhesion of the topcoat.
The role of primer
The role of primer 1 , to improve adhesion
The emulsion content in the primer is relatively high, the adhesion is relatively strong, and the penetration is good. After the primer is used, the binding force between the latex paint film and the wall surface can be effectively improved. At the same time, the good adhesion of the primer can make the wall more smooth, and it is also more conducive to the painting of the topcoat, which can reduce the amount of topcoat used.
The role of primer 2 , fill in
If the wall in the home is not strong enough and it is flat, you may not use a primer. Of course, using a primer will be better. Applying a layer of sealed primer before applying the top coat can not only save the decoration cost, but also has the advantage of being more effective when applied from a long-term decorative effect. Primer can make the wall smoother, so that the wall to avoid paint disease, but also help to maintain a longer brushing effect, why not do it.
The role of primer 3, closed base wall
Some of the walls are more alkaline, and after soaking with moisture, water, etc., they will produce alkali flowers. The scientific name is also known as ubiquitine. This situation will cause the formation of craters on the surface of the paint film. When it is severe, it will form a layer of alkali cream. The paint film will eventually be destroyed. However, if the primer is used, it can relieve such situation and play a role in sealing the wall. If it is a wall with a relatively dry floor, it may not be a problem without a primer, but for the sake of safety, it is best to apply a primer.
How to choose the primer?
There are many kinds of primers available. How to choose the primer should be based on the characteristics of the base layer and topcoat. Usually there are several aspects for reference:
1, according to the porosity of the base layer
The loose and porous base layer should be coated with a transparent primer that can penetrate into the pores deeply to achieve a good sealing effect. A substrate with a small void ratio can be selected as a film-forming white primer to form a dense film to seal the substrate.
2, according to the strength of the grassroots
For grass-roots high-strength, high-hardness grass-roots, a harder white primer should be chosen as the sealer primer to achieve strength consistency.
3, according to the degree and possibility of ubiquitine
Alkaline strong, easy to basal wall, should choose to seal the performance of solvent-based primer.
Tips: The difference between primer & topcoat
1, different composition
The primer is composed of four parts: resin, filler, solvent and auxiliary agent; the difference between the top coat component and the primer is mainly that the filler of the former is added little or no.
2, play a different role
The role of the topcoat is mainly scratch resistance, hardness, gloss, feel, transparency, aging resistance, yellowing resistance, etc. The quality of the topcoat directly affects the quality of the entire paint film, but the primer is the paint system One layer, used to fill the paint surface, support the topcoat, provide fullness, reduce costs, and help save energy; topcoat is the final coating of the coating, and is the last applied layer of the building wall decoration to increase The number of coats of topcoat and the method of thick topcoats increase the film thickness. The thickness of the coating is mainly provided by the primer, while the topcoat is mainly used for decoration and protection.
Editor's summary: What are the functions of primers and primers ? We have introduced them here. I hope this article will help you. If you want to learn more about primers and other decoration knowledge, you can follow our website information channel!
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