Common knowledge of coatings: selection of additives for waterborne two-component polyurethane Antirust Coatings

Core tip: in recent years, China has paid attention to environmental protection, strictly restricted solvent emissions, and developed a variety of waterborne coatings Because the traditional solvent based two-component polyurethane coating emits a large amount of VOC to the air in the process of manufacturing, construction and film-forming, which poses a serious pollution and threat to the human ecological environment, so the two-component waterborne polyurethane coating is more and more popular In the preparation process of two-component polyurethane coating, there are always defects of bubbles, so it is necessary to add additives with defoaming effect The antifoaming agents can be divided into defoamer and defoamer: when choosing defoamer or defoamer, the surface Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Home of coatings news: in recent years, domestic attention to environmental protection, strict restrictions on solvent emissions, the development of a variety of waterborne coatings Because the traditional solvent based two-component polyurethane coating emits a large amount of VOC to the air in the process of manufacturing, construction and film-forming, which poses a serious pollution and threat to the human ecological environment, so the two-component waterborne polyurethane coating is more and more popular In the preparation process of two-component polyurethane coating, there are always defects of bubbles, so it is necessary to add additives with defoaming effect The antifoaming agents can be divided into defoamer and defoamer: when choosing defoamer or defoamer, the surface tension should be lower than the surface tension of the coating, and there should be certain incompatibility with the coating system, but it can not produce negative effects Therefore, the defoamer and defoamer suitable for the waterborne two-component polyurethane antirust coating should be found through experiments At last, organosilicon defoamer and organosilicon defoamer were selected, the dosage was 0.1% - 0.3% For the water-based coating system, by adding a small amount of base material wetting agent, the interfacial tension between the coating and the base material can be reduced, the distribution of the coating can be improved, the shrinkage can be prevented, and the adhesion can be enhanced The amount of base material wetting agent must be moderate, too much base material wetting agent will form micelle, which will cause some of the added defoamer to enter into it, thus reducing the defoaming effect Wetting agent can reduce the surface tension between liquid and solid, enhance the hydrophilicity of pigment surface, and improve the mechanical properties Grinding efficiency: the dispersant adsorbs on the surface of pigment to form charge effect or steric resistance effect, so that the dispersant is in a stable state The choice of wetting agent and dispersant should be suitable for the system, otherwise, the paint will appear some undesirable phenomena such as floating color, blooming, stratification, floating water, precipitation, etc Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,