The main function of the wetting agent is not to be used in the pigment grinding process. Its main function is to reduce the surface tension of the pigment system, so that the pigment can achieve good adhesion and leveling properties during the coating process on the substrate. Therefore, There is a certain difference between wetting agents and wetting and dispersing agents.
Wetting and dispersing agents are actually a type of dispersant. They have a wetting effect, and this wetting effect mainly acts on the pigment particles, reducing the surface energy of the pigment particles and reducing the intermolecular force. In this way, ultra-fine particles It is less affected by molecular forces, thus making preparations for the subsequent adsorption of the wetting and dispersing agent on the surface of the pigment particles. In the dispersion stage, the main function is to adsorb the wetting and dispersing agent on the surface of ultrafine particles, and achieve a stable effect through the formation of electrostatic repulsion, steric hindrance and other effects. Moreover, this force exists for a long time and can form a stable pigment slurry, even if During the grinding process, it will not affect the size of the pigment particles, but more wetting and dispersing agents are needed to solve this problem.
Therefore, there is a difference in performance between a wetting and dispersing agent and a wetting agent. What needs to be added during the pigment grinding process is a wetting and dispersing agent, which will be firmly adsorbed on the surface of the pigment and filler particles to form a charge effect or steric hindrance effect. A mutually repulsive force is generated to prevent polymerization and keep the dispersion in a stable state. During the paint coating process, adding wetting agents can achieve good adhesion and leveling properties.