How to increase the leveling properties of the paint?-Iota

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Service > How to increase the leveling properties of the paint?

How to increase the leveling properties of the paint?

Leveling agent is a common paint additives, it can promote the formation of a coating smooth, uniform coating in the dry film process.
Many types of leveling agent, leveling agent used in paints streams of different types are not the same.
After coating application, there is a flow and dry deposition process, and then gradually form a smooth, uniform coating. Film can achieve the smooth characteristics, known as leveling.
Shrinkage is one of the characteristic defect coatings produced in leveling and film formation process. In the actual construction process, due to poor leveling, brush marks when brushing, generated when the roll roller marks, orange peel when spraying occurs during the drying process accompanied by craters, pinholes, sagging and other phenomena, are called leveling bad, these phenomenon reduces the paint decoration and protection.
Surface coating leveling factors are many volatile solvent gradient and solubility, the surface tension of the coating, the wet film thickness and the surface tension gradient, coating rheology, the construction process and the environment, the most important factor is the coating tension, surface tension gradient in the surface tension of the surface layer and the wet film forming process, the wet ability of the membrane to produce uniform. Improve the coating leveling need to consider adjusting recipes and adding suitable additives, the coating has the right and ability to reduce the surface tension of the surface tension gradient.
Dry film coating defects common shrinkage, orange peel, brush marks, roller marks, sagging.
Refers to the formation of irregular shrinkage of the coating film of small bowl-like depression, loss of smoothness of the coating, often to a drop or a small impurity center, forming an annular rib around it. From the leveling point of view, it is a special kind of "point" of the uneven flow, resulting in the coating surface, the shape of the performance can be divided into flat type, crater-type, point, exposed bottom type, bubbles type and so on.
Solvent-based leveling agent mainly high-boiling solvent mixtures. Solvent-based paints by means of a solvent to reduce the viscosity increased only to improve leveling, the paint solids will drop and cause sagging and other ills; or maintain the solvent content, addition of only a high boiling solvent to adjust the evaporation rate to FIG improve leveling, and dried time is extended accordingly.
So the two programs are not ideal. Only high boiling solvent mixture is added to the display characteristics of the various increments (volatile index, distillation curve, dissolving ability) is preferable.
Solvent-based leveling agent is a major component of a variety of high-boiling solvent is mixed with a good solubility, are also good pigment wetting agents. Due to solvent evaporation at room temperature fast curing paints, coatings prevent the flow of excessive increase in viscosity caused by brush marks, the solubility of the solvent evaporation resulting in deterioration of the base material resulting from shrinkage or generate boiling marks in the baked coating, the foaming other ills use of such aids are very effective.
Another high-boiling evaporation rate adjustment leveling agent, but also to overcome the shortcomings whitening. Long chain resin compatibility restricted commonly used are polyacrylic acid, cellulose acetate butyrate and the like. Their lower surface tension, can reduce the surface tension of the coating and the substrate between the substrate to increase to improve the wettability of the coating, excluding the gas molecules adsorbed on the solid surface to be coated, to prevent the gas molecules are adsorbed to exclude late in the cured coating film formed on the surface recesses, craters, orange peel and other defects; addition, they are not completely mixed with the resin content, can quickly migrate to the surface to form a monomolecular layer, the surface tension of the surface to ensure that uniform, increased resistance to shrinkage effect, thus improving the smooth coating film surface. Polyacrylate leveling agent can be divided into pure polyacrylate, modified polyacrylate (or silicone split), acrylic resins and other alkali tolerance, pure polyacrylate leveling agent with ordinary epoxy, polyester resin or polyurethane resin, poor compatibility with the coatings, the coating will be formed with the application of a mist. In order to improve the compatibility, there is usually a good miscibility of the copolymer. Long chain silicone compatibility restricted commonly are poly dimethyl siloxanes, poly (methylphenyl) siloxanes, organic-modified polysiloxane. Such materials can improve the wettability of the substrate and the control flow on the surface effects play a role to improve the leveling, after evaporation of the solvent, a silicone resin coating the surface of the monolayer formation, improve the gloss of the coating film. Polyether-modified silicone can be divided modified silicone, polyester-modified silicones, reactive silicones, organic groups introduced into polysiloxane and helps to improve the compatibility of the coating resin, even concentration is increased and it does not produce the side effects of incompatibility, modified polysiloxane can reduce the interfacial tension of the coating and the substrate to improve the wettability of the substrate to improve the adhesion, prevent blur, orange peel, reduce shrinkage holes, pinholes and other surface coating sick. Fluorine-based surfactants, the main component of polyfluorinated polyenes, for many resins and solvents also have good compatibility and surface activity, help to improve the wetting, dispersing and leveling,, also adjusting the solvent evaporation rate of solvent-based paints.

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