Functional synergy and formulation design optimization of leveling agents and wetting agents

In the fields of coatings, inks, adhesives, etc., leveling agents and wetting agents are key additives for improving surface properties. Although the two have different functional focuses, leveling agents focus on eliminating surface defects, while wetting agents focus on reducing interfacial tension. However, in practical applications, a synergistic effect is required to achieve the best results. Therefore, how to coordinate the relationship between the two has become the core issue in formula design.

Leveling agents migrate to the surface of coatings, reducing surface tension gradients and eliminating defects such as orange peel and shrinkage. Common types include organosilicon or acrylic esters. Wetting agents improve the wettability of the substrate by reducing the contact angle between the liquid and the substrate, avoiding problems such as fish eyes or poor adhesion. They are mostly fluorocarbon or non-ionic surfactants. Wetting agents ensure even spreading of the coating, while leveling agents further smooth the surface on this basis, jointly ensuring the appearance and performance of the coating.

Wetting agents need to rapidly reduce dynamic surface tension to achieve initial wetting, while leveling agents need to maintain uniform tension in the later stages. Therefore, it is recommended to choose a combination of wetting agents and slow migration leveling agents. Excessive wetting agent may hinder tghe miration of leveling agent, and the addition ratio needs to be adjusted reasonably. By designing molecular structures and optimizing the order of addition, leveling agents and wetting agents can achieve a dynamic balance of "initial wetting later leveling", thereby achieving the best effect of functional synergy and formulation design.