The role of wetting agents in improving adhesion and durability in coatings is mainly reflected in the following aspects:

1、 Improve adhesion

Wetting agents can significantly reduce the surface tension of coatings, making them easier to spread on the substrate surface. This good wettability helps the coating to better penetrate into the tiny pores or uneven surfaces of the substrate, forming a stronger mechanical anchoring effect. When the coating forms a larger contact area with the substrate surface, the adhesion is naturally improved. It is worth noting that good wetting of the substrate by the paint coating is a prerequisite for obtaining mutual attraction between polar groups, and wetting agents improve wetting properties by facilitating the binding of polar groups, thereby enhancing adhesion. Wetting agents may contain functional groups that can undergo chemical reactions with the surface of the substrate. These functional groups can form chemical bonds with the active sites on the surface of the substrate, thereby enhancing the interfacial adhesion between the coating and the substrate. This chemical bonding not only enhances adhesion, but also helps improve the durability of the coating.

2、 Improve durability

The stable dispersion effect of wetting agents in coatings helps to reduce pigment settling and aggregation, thereby maintaining the uniformity and stability of coatings during storage and use. This stability ensures that the coating can form a continuous and dense coating after application, which helps to improve the durability and service life of the coating. Improving wear resistance and corrosion resistance, certain wetting agents may have the function of enhancing the wear resistance and corrosion resistance of coatings. They can maintain better stability and integrity of the coating when subjected to external mechanical friction or chemical corrosion by changing the surface morphology of the coating or introducing specific wear-resistant and corrosion-resistant components. In some cases, wetting agents may also promote curing reactions in coatings. The curing reaction is a key process for the formation of a hard and durable coating film in coatings. Wetting agents improve the compatibility and reactivity of coating components, which helps accelerate the curing reaction and generate higher quality coatings, thereby enhancing the durability of the coating.

In summary, wetting agents in coatings effectively improve the adhesion and durability of coatings by improving wetting properties, enhancing interfacial adhesion, improving coating stability, and promoting curing reactions. Under the combined action of these factors, the coating can maintain good performance and service life in various complex environments.