Adhesion Promoter

Adhesion promoters are additives used to enhance the adhesion between coatings and various substrate surfaces. On low surface energy substrates, coatings often suffer from poor adhesion, peeling, or detachment due to insufficient surface energy. To address this issue, adhesion promoters significantly enhance the bonding force between the coating and the substrate surface by increasing the affinity between them or by reacting chemically with the substrate surface. This effectively prevents coating detachment during use and ensures long-lasting adhesion.

Their working mechanism primarily involves introducing polar or reactive groups into the coating. These groups can form chemical bonds with the substrate surface or generate strong physical adsorption. This molecular-level bonding enhances the adhesion between the coating and the substrate surface, enabling the coating to maintain stable adhesion during long-term use and preventing problems such as peeling, detachment, and blistering. Simultaneously, adhesion promoters can provide additional protection in certain special conditions, preventing damage to the coating in harsh environments and further improving the coating's abrasion resistance and corrosion resistance.

Adhesion promoters are widely used in coating systems requiring enhanced adhesion, such as coatings for low surface energy substrates like plastics, metals, and glass. These substrates, due to their low surface energy, struggle to achieve good physical and chemical bonding with coatings. Therefore, adhesion promoters are needed to improve the coating's adhesion strength. Typical applications include automotive paints, appliance coatings, architectural coatings, and electronic coatings. In these applications, adhesion promoters ensure durable adhesion of the coating to the substrate surface, improving its peel resistance, corrosion resistance, and aging resistance.