Function

Mechanism

Improve mechanical bonding

By improving the permeability and wettability of the coating to the substrate, the coating can penetrate into the pores and cracks of the substrate as much as possible. After solidification, countless small anchors are formed to firmly grasp the substrate, thereby improving the adhesion of the coating film to the substrate.

Improve Van Der Waals force

According to calculations, when the distance between the two planes is 1 nm, the van der Waals force can reach 9.81~98.1 MPa. By improving the wettability of the coating to the substrate, the coating can be wetted as completely as possible and close to the substrate surface before curing, thereby increasing the van der Waals force and ultimately improving the adhesion of the coating film to the substrate.

Provide reactive groups and create conditions for the formation of hydrogen bonds and chemical bonds

The strength of hydrogen bonds and chemical bonds is much stronger than that of van der Waals forces. Adhesion promoters such as resins and coupling agents provide reactive groups such as amino, hydroxyl, carboxyl or other active groups, which can form hydrogen bonds or chemical bonds with oxygen atoms or hydroxyl groups on the surface of the substrate, thereby improving adhesion.

Diffusion

When the coated substrate is a polymer material, a strong solvent or chlorinated polyolefin resin adhesion promoter can be used. It can promote the mutual diffusion and dissolution of the coating and substrate molecules, eventually causing the interface to disappear, thereby improving the adhesion between the coating film and the substrate.