The water-based coatings quickly adapt to people's requirements for environmental protection and low carbon with the characteristics of low volatile organic compound (VOC) release and no hidden fire hazards, which has become one of the key directions for the development of the coating industry. However, unlike the relatively low surface tension of solvent-based coatings, the use of water as a dispersing medium also brings with it that the coating film is extremely easy to shrink due to high surface tension, the system is easy to foam, the pigment is difficult to disperse, and the substrate is difficult to be effective Wetness and adhesion. In order to eliminate the various paint film defects caused by the high surface tension of water, more and more auxiliary products are applied to water-based coating systems, such as water-based leveling agents, water-based defoamers, and water-based dispersants.
Generally, the additives used in water-based systems are mainly surfactants. They generally reduce surface tension (such as paint film-air interface) and interfacial tension (such as pigment-paint film interface, paint film-substrate interface, etc.). Eliminate corresponding paint film defects or improve paint film performance.
Because of their structural characteristics, organic silicon compounds usually have lower surface tension and higher surface activity. They are widely used in water-based coating systems and are important varieties of water-based coating additives. And because of its adjustable structure, organic silicon can achieve different usage effects and provide diversified performance by adjusting its structure.