Have you had any color problems with these coatings? Here's a solution!

original title: Have you had any color problems with these coatings? Here's a solution!question one: the color formula does not change, the color difference is very largereason: 1) the difference between the color slurry batch (coloring force control range 100 x 5%) 2) difference slots between the raw materials of the coating (covering force, decolorization force, gloss difference) ) difference in compatibility between the color slurry and coating (different compatibility, show Color and hue is different)solution:try to use the same batch of the same batch of color slurrypaint raw materials as little as possible replacementchange the color slurry and paint compatibility test each time before the scale first do small sample experiments problem two: color slurry added to the paint, color floating on the surface.reasons: 1) the difference in surface tension between the color slurry and coating is too large coating generally with anion type or iontype polymer dispersant, and color slurry is generally used non-ionization or part of the yin.dispersant is used to allow white pigments and colored pigment surfaces to adsorption different wetting dispersants, with different surface tension.2) the compatibility of the color slurry and the coating is not good emulsifier outside the emulsion particles and the surface active agent outside the yan and filler particles compatibility is not good, resulting in the flotation of pigments.3) The water-related oil balance value between the color slurry and the coating does not matchthe oil-related substance has a small surface tension on its oil-related end and is easier to float to the surface.4) the effects of thickenerssome false plasticity strong conjugate thickeners with higher HLB values of surfactants have a great affinity, making it in pigments.surface disattached, resulting in the accumulation of pigments and flocculation, resulting in floating hair flowers.solution:the selection of suitable wetting dispersants, adjust the surface properties of particles, adjust their movement balance, is the best to control the floating color. no matter what causes colored pigment flocculation, whitening, pigment flocculation floatcolor, can use wetting dispersant to solve flocculation. improve the surface properties of particles to prevent or control floating color, in the process of controlling floating color several floating color phenomena can be transformed from each other to control floating color. If it is the color of the floating slurry, the HLB value of the coating is larger than, more hydrophilic, the basic paint preparation process added oil-friendly low-polar additives to reduce the HLB value of the coating, if the floating color is white, indicating that the HLB value of the coating is relatively small, relatively oil-friendly, the basic paint preparation process to add hydrophilic additives, increase the hydrophilic nature of the coating. some systems can resist coating film floating color, add anion-type wetting dispersant in the finished paint, adsorption on the surface of carbon black or organic purple pigment particles, improve the surface properties of pigment particles, enhance polarity, these non-polar weak polar particles have the same polarity as white particles, with the polymer has the same degree of adsorporist flocculation, and thus in the coating film drying motion ability is equivalent, control floating color. The use of strong surface tension reduction of surfactants, commonly used silicone surfactants, so that in the film drying process to the surface to form a single molecular film, balance the surface tension and control the hair flowers; add additives that can produce tactile structures, such as kaolin, or silica, to form a network structure in the paint film, to prevent pigment separation, control pigment flocculation, settlement and Benaud's spiral nest flow, reduce the phenomenon of floating color hair flowers to prevent floating colors or hair flowers. problem three: the color paint wall roller coating process appeared obvious roller reasons: 1) paint operation thickness is not uniform 2) construction no wet connection 3) compatibility problems 4) latex paint in the dose is insufficient 5) The amount of emulsion in the latex paint is not enough 6) wall is not a complete disparate solution: is mainly for the compatibility problem 1) mechanical dispersion (color paint) color paint color in a certain mechanical dispersion, the color can be displayed. 2) add wetting agent (color paint) add moisturizer, the color becomes much darker, refers to the study color difference becomes smaller, brush plate after no obvious brush marks. 3) Adjust the coating formulation (base paint) change the wetting dispersion thickening system of the coating to solve the compatibility problem of the coating and the color slurry. question four: after the rain paint surface has obvious rain marks reasons: 1) poor water resistance of the base paint (emulsion hydrophiliability is too strong, wetting agent excessive or hydrophilic additive use is too large) 2) the substrate water content is too high or the environment humidity is too large 3) closed primer, did not achieve the effect 4) coating film is not completely dry on the water wash 5) dark paint in the amount of additive stake too much prevention methods: 1) as little as possible with surfactants, as far as possible with silicone, reduce moisture absorption 2) with fluorine modified resin or additives, enhance water resistance and anti-fouling. 3) use water-resistant good emulsion 4) surface paint cover varnish problem five: after the rain paint surface has obvious color loss reason: 1) paint film construction table dry time is insufficient, less than 2 hours after construction rain 2) paint PVC concentration is too high, that is, the lotion is too low or filling 3 paint) Membrane water resistance is very poor solution: 1) improve the content of emulsion 2) choose water-resistant good emulsion problem six: after a period of time the wall has obvious fading (hair flower) reason: 1) paint lotion content is low 2) paint water resistance is not good 3) color slurry selection is not appropriate
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