Additives are a missing component in coatings and are commonly used to improve the apparent and mechanical properties of coatings, perhaps giving the coating a specific function. The commonly used additives in floor coatings are granules, defoamers, leveling agents, rheological agents, as well as anti-static, anti-skid, matting and other functional additives. Common drawbacks in floor coatings are mainly shrinkage holes, pinholes, orange peel, loss of light, shrinkage and laughter, because of the poor sputum and the resulting hair color and floating color, uneven color, because it is not leveled Inequality in appearance. These problems often require the right additives to eliminate.
1Damp smashing agent polymer moist smashing agent is mostly block polymer or graft polymer of polyurethane, polyacrylate, polyester, etc. The molecule has multiple adsorption group structures and solvated segment structure, which is formed in the appearance of pigment. The thicker and stronger adsorption layer has large steric hindrance and entropy repulsion, and the stability of the enthalpy system is good. The granules commonly used in solvent-based floor paints are EFKA 4046, EFKA4050, BYK's dis-perbyk and BYK series. If the sputum powder is improperly selected or the amount of sputum agent is too small, the pigment filler should not be dispersed to the required fineness. The system is not stable, and the pigment and filler are prone to flocculation, aggregation and sedimentation, resulting in poor storage stability of the coating, which may result in the coating being unusable. When there are too many dispersing agents in the coating system, the excess scum agent causes a severe drop in the surface tension of the coating and makes the smashing system unstable. When using the floor coating with poor dispersion effect, the apparent effect of the floor paint film is not good, the gloss is low, the flowering and floating color are easy, the color is uneven, and the mechanical function of the paint film is lowered.
2 Defoamer has many elements for foam composition and stability in the coating formulation, and many of the various additives involved are external active agents, which have a stable effect on the bubbles. Therefore, anti-foaming and defoaming are problems that cannot be ignored in the production and construction of paints. The problem of defoaming in solvent-based coatings is not as severe as that of water-based coatings, but it also needs to be paid attention to. In the floor coating, the improper use of defoaming agent will lead to defects such as shrinkage, shrinkage, fisheye, pinhole, orange peel, loss of light, shrinkage and laughter, which will seriously affect the appearance and function of the film. . The types of defoamers commonly used in solvent-based coatings are mainly lower alcohols, fatty acids, metal soaps, silicone resins, etc., which are insoluble in the system, such as n-butanol, tributyl phosphate, zinc isooctanoate, methyl silicone oil, etc. However, their defoaming function is unsatisfactory, and it is easy to fail or the film defects may occur. Nowadays, modified silicone resins or high-efficiency defoamers such as polyacrylates and polyolefins are commonly used. For example, defoamers that should participate in different functions during the production of paints should be used. Antifoaming agents for foam suppression should be used in the grinding process. After the grinding, the antifoaming agent that participates in the foam breaking function can be appropriately used in the construction process to defoam the defoaming roller.
3 leveling agent For floor coatings, the leveling of the coating is an important functional indicator. If the leveling property of the coating is not good, the appearance of the coating film is not uniform, showing significant brush marks, and the drawbacks such as shrinkage holes and pinholes appear in the drying process, which endangers its protection and beautiful functions. Epoxy coatings and polyurethane coatings in floor coatings are more prone to such drawbacks. The leveling property has a great relationship with the solvent of the system. When the leveling property is not good, it can properly participate in the high boiling point solvent to improve, otherwise too much high boiling point remains in the paint film for a long time, which seriously reduces the mechanical strength of the paint film. Improved leveling generally reduces the surface tension between the coating and the substrate by improving the leveling agent, so that the coating and the substrate have better moisture properties, and form a monolayer on the outer surface of the coating film to provide uniform surface tension. Then improve the leveling function of the coating. There are three types of commonly used leveling agents: polymer leveling agents, silicones and fluorocarbons. EFKA, BYK, Deqian and Huaxia have products with superior functions. For example, EFKA3777 is a fluorocarbon modified polyacrylate, which is widely used in floor coatings.
4 The production, construction and film formation of rheological additive coatings have different requirements on the shear rate of the system, and the coatings are generally required to have a certain thixotropy. For floor coatings, the effect of the rheological additive is mainly to prevent the pigment from settling and accumulating during storage and to improve the paintability. Commonly used rheological additives are organic earthworms, fumed silica, castor oil derivatives, metal soaps, etc.
5 Utility additives Fumed silica can effectively reduce the gloss of the paint film. It is a commonly used matting agent, but it should be sufficiently dispersed, and fumed silica has a thickening effect. Antistatic coatings need to participate in conductive agents or antistatic agents. Conductive agents include various metal powders, metal oxides, conductive carbon black, graphite, conductive mica powder, and the like. They form a certain conductive path in the paint film, which guides the static electricity from the surface. Antistatic additives are some external active agents that adsorb moisture in the air and form a very thin conductive layer on the exterior of the paint film, forming a channel for electrostatic leakage. The disadvantage is that as the application time increases, the antistatic additives in the paint film become less and less, and the function is gradually reduced. The paint is a multi-phase multi-component system, and the participation of each component affects the paint system. The balance affects other functions of the coating. Together, an additive is used to achieve different functions under different conditions. For example, silicone resin can be used as a leveling agent, and can also be used as an antifoaming agent or an anti-slip agent. Metal soaps can be used in rheological and driers. Certain bulking agents can have a large effect on viscosity. Therefore, the correct selection of suitable additives for different systems is an important part of the coating skills.
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