Common knowledge of coating: what are the functions of dispersant and wetting agent in latex coating

Core tip: in the process of manufacturing latex coating, the pigment must be well wetted and dispersed with water, so as to return to the fineness of primary particles, achieve the best dispersion state, have the best covering power and coloring power, and give the coating the stability and luster it should have In the latex coating, there is a great cohesive attraction between the small pigment and filler particles, so it has a strong tendency to agglomerate large particles However, the latex coating uses water as the dispersion medium, and the cohesion energy density between water molecules is higher, which can aggravate this tendency In order to overcome this tendency, it is necessary to make use of Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Paint Home News: in the process of manufacturing latex paint, the pigment must be well wetted and dispersed with water, so as to return to the fineness of primary particles, achieve the best dispersion state, have the best covering power and coloring power, and give the paint the stability and luster it should have In the latex coating, there is a great cohesive attraction between the small pigment and filler particles, so it has a strong tendency to agglomerate large particles However, the latex coating uses water as the dispersion medium, and the cohesion energy density between water molecules is higher, which can aggravate this tendency In order to overcome this tendency, it is necessary to use wetting agent and dispersant to make the pigment wet and disperse The function of wetting agent is to reduce the surface tension between pigment and water interface, so that it is easy to be wetted The function of dispersant is: ① reduce the particle size of pigment to primary state; ② the exposed pigment surface is wetted; ③ the primary particles of pigment are stable in liquid phase Dispersant is a kind of surfactant Its function is often evaluated by its wetting, dispersing (fineness after grinding) and stabilizing effects on pigments and fillers Good wetting effect is beneficial to the grinding of pigment paste -General dispersants all have a certain wetting effect, but the effect of wetting by them alone is often not good, so they are often used in combination with wetting agents Dispersion is achieved by grinding pigment slurry or high-speed dispersion of ultrafine pigments and fillers The finer the pigment particles are ground, the shorter the time is, the better the dispersion effect is The stability of dispersant is very important, and the coating made by dispersant with good stability also has good stability 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,