What is a primer?

Primer is a pre-treatment agent used to enhance the adhesion between the coating and the substrate. The following is a detailed explanation of primer:

Definition:

Primer, also known as treatment agent, adhesion promoter, is a colorless, solvent-containing liquid with siloxane as the main raw material.

It is specially used for the connection between addition silicone and condensation silicone and a variety of difficult-to-bond materials as a connecting agent.

Uses:

Improve coating adhesion: Before surface coating, primer can be brushed on the surface to form a thin film to improve the adhesion of subsequent coatings (such as topcoat), effectively solving problems such as shedding after coating.

Enhance corrosion resistance and durability: Primer provides an additional protective layer for the surface, providing better corrosion resistance and durability, which is very important for equipment and structures used for a long time in the external environment.

Smooth coating surface: Primer can make the surface smooth, reduce the occurrence of particles, pitting, bubbles and other problems in subsequent coatings, and provide better visual effects.

Adjust color and gloss: Primer can adjust color and gloss to meet different coating requirements.

Types:

Primers can be classified according to their chemical composition, physical properties and the basis of coating materials.

Main ingredients (taking automotive glass primer as an example):

Polysiloxane: a high-boiling point silicone polymer with excellent heat and chemical resistance, which can form a weather-resistant and corrosion-resistant protective film.

Silane coupling agent: an organosilicon compound that can form chemical bonds on the glass surface and combine with other ingredients in the primer to increase the adhesion of the coating.

Wetting agent: an organic solvent that makes it easier for the coating to be evenly distributed on the glass surface and improves the wettability of the coating.

Impurity remover: helps remove impurities and dirt on the glass surface to ensure the quality and effect of the primer.

Film-forming agent: enables the primer to form a uniform and smooth film layer on the glass surface, improving the gloss and durability of the coating.

Applicable materials:

Primers usually have different formulas and types according to different substrates (such as plastics, metals, glass, etc.) to improve the bonding ability between the surface of the material and the paint or adhesive.

In summary, primer is an important pretreatment agent that is widely used in the coating industry to improve the adhesion between the coating and the substrate and enhance the overall performance and durability of the coating.