Common knowledge of coating: analysis of floating color and blooming in dispersant coating

Core tip: we can see in all kinds of technical documents that the principle analysis of selecting suitable dispersant, floating color and blooming of polychrome paint involves various aspects, such as particle size, specific gravity and surface treatment of pigment, volatilization, polarity and dissolving force of solvent, grinding shear force and temperature, compatibility between film-forming substances in the system and the influence of rheological assistant, etc All of the above factors can be minimized by selecting the appropriate dispersant, so as to achieve the color stability of the coating and avoid the phenomenon of floating color and blooming At the same time, because of its relatively special formulation and construction, coil coating 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 Home of coatings news: select the appropriate dispersant, the principle analysis of floating color and blooming of polychrome paint we can see in all kinds of technical documents, involving all aspects, such as the particle size, specific gravity and surface treatment of pigments; the volatilization, polarity and solubility of solvents; grinding shear force and temperature; the compatibility between film-forming substances in the system and the influence of rheological additives, etc All of the above factors can be minimized by selecting the appropriate dispersant, so as to achieve the color stability of the coating and avoid the phenomenon of floating color and blooming At the same time, due to its relatively special formulation, construction and drying conditions, we also need to pay attention to the following aspects when choosing dispersants: the medium and high polarity system is suitable for low amine value, avoiding the influence on the performance of acid catalyst, avoiding the high temperature influence on recoating and yellowing, controlling the dilution before and after storage, and the dispersant dosage under the low cost requirement of low color difference before and after storage In any case, the key to the simplification of complex problems is the migration of different pigments in the system The greater the migration difference, the greater the color difference What we need to do is to stabilize these pigments through dispersants, so that they can maintain relative migration stability in the same system as much as possible For example, the common white ash and sea blue in coil coating, the common "floating white" phenomenon is mainly due to the fact that carbon black or phthalocyanine blue is not easy to disperse and stabilize compared with titanium white, which leads to the tendency of flocculation in coating After storage and dilution, it is difficult to sink or migrate due to the increase of pigment agglomerate particles On the contrary, titanium dioxide pigment, which is easy to disperse and stable, is not easy to flocculate in the system, so the agglomerate particles are small and easy to be affected by other factors, resulting in the migration trend to the surface of the film, forming the "floating white" phenomenon In this case, the use of white pulp dispersant, or the combination of controlled flocculation dispersant, is very effective In order to meet the appearance requirements of high brightness and high freshness, the color dispersant in the coating of home electric board should be used as much as possible This kind of coating can solve the "floating white" phenomenon by improving the dispersion and stability of phthalocyanine blue or carbon black It needs to use high molecular deflocculation dispersant with enough addition amount, or even with pigment synergist Corresponding to "floating white" are "floating black" and "floating blue" According to the same principle, that is, the white pulp is not stable, so it is necessary to select a dispersant for fully deflocculation of titanium dioxide Of course, it can also reduce the degree of deflocculation of carbon black or phthalocyanine blue, but this will affect the appearance of the film and reduce the stability of the color paste, which is generally not used However, the blooming phenomenon in the tank can be improved by using a small amount of organosilicon surface additives, which is simple and effective However, the migration and heat resistance of organosilicon products should be taken into account without affecting the recoating Generally speaking, the problems of floating color and blooming can be overcome by keeping the relative stability of various pigments in the multi-color paint 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,