润湿分散剂是一种表面活性剂，它能够降低液/固之间的界面张力，可提高颜料的分散效率，缩短研磨时间。分子量低的湿润效率高。能够吸附在粉体离子的表面上构成电荷斥力、空间位阻效应，使分散体处于稳定状态。通过在分散的同时还需研磨，借助机械作用把颜料凝聚体和附聚体解聚成接近原始粒子的细小粒子，并均匀分散在连续相中。润湿分散剂用量不仅与涂料及粉末性质有关，而且很大程度取决于粉末的粒径，一般需通过实验决定。
Wetting dispersant is a kind of surfactant, which can reduce the interfacial tension between liquid and solid, improve the dispersing efficiency of pigments and shorten the grinding time. Low molecular weight and high wetting efficiency. It can adsorb on the surface of powder ions to form charge repulsion force and steric hindrance effect, and keep the dispersion in a stable state. By grinding at the same time of dispersion, the pigment aggregates and agglomerates are decomposed into fine particles close to the original particles by mechanical action, and evenly dispersed in the continuous phase. The amount of wetting dispersant is not only related to the properties of coatings and powders, but also to a large extent depends on the particle size of powders. Generally, it needs to be determined by experiments.