Adhesion type and adhesion property of paint film on substrate
The adhesion of the paint film to the substrate is divided into two types: mechanical adhesion and chemical attachment.Mechanical adhesion depends on the properties of the coated sheet (roughness, porosity) and the strength of the formed film; chemical adhesion refers to the mutual attraction of the paint film molecules and the plate molecules at the interface between the paint film and the sheet, depending on the paint film And the physical and chemical properties of the board.Compared with the two types, it is generally considered that the chemical adhesion is more realistic and is the most important type of film adhesion.
Investigating the adhesion of the paint film to the surface of the object to be coated requires attention to three aspects:
1.Degree of wetting of the board by liquidfilm-formingsubstances
2.Formation of oriented adsorption layer on the surface of the substrate
3. Forming a two-electron layer at the interface between the film former and the substrate.
The adhesion of the paint film depends on the polar group of thepolymer(or lower molecular weight prepolymer) in the film-forming substance, such as -OH, -COOH, and the polar group on the surface of the object to be coated.In order to make such a polar group bond well, it is required that the polymer molecule has a certain fluidity, so that the polymer molecule can better wet the surface of the substrate, so that the polar group of the polymer is close to the polar group of the coated surface; The distance between the two molecules becomes very small (up to 1A), and the adhesion between the polar groups is due to the combination of van der Waals force, chemical affinity, hydrogen bonding and other cohesive forces.

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