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Application of Coating Additives in Coil Coatings
2022-12-29
The physical and chemical properties of coil coatings, like all organic coatings, are guaranteed by the matrix film-forming resin, fillers and pigments, and functional additives in the formula. The main film-forming resin and pigment can provide more than 80% of the basic properties of the final coating of the coil coating, such as processing performance, weather resistance, etc., but there will be a limit to the performance of this coating, such as rapid curing ability, better Excellent cooking resistance, corrosion resistance, best scratch resistance, hardness, smoothness, rapid dispersion of pigments and fillers, color development and anti-settling properties, and coating leveling, anti-floating color, higher T-bend , Adhesion, MEK solvent wiping resistance, etc. are not fully achieved by matrix resins and pigments and fillers. These properties need to be guaranteed by corresponding functional additives.
A smart boss will try his best to synthesize the matrix resin for coil coatings by himself, so as to minimize the cost of painting and control some unique coating properties, while the coating factory itself is inconvenient. The pigments, fillers, additives, and organic solvents produced must be purchased from outsiders.
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There are more kinds of additives used in the formulation of coil coatings than other types of coatings, especially in terms of high temperature resistance and other performance requirements. Therefore, various additives that can be used in coil coatings that are quickly baked and cured, Such as: dispersants, defoamers, catalysts, leveling agents, adhesion additives, anti-floating and anti-shrinkage additives, etc., are generally more suitable for application in other industrial coatings.
It is suitable for all kinds of baking varnishes for metal substrates, and it is also suitable for glass and ceramic baking varnishes. It is especially effective for magnesium-nickel, magnesium-aluminum alloys, galvanized sheets, aluminum sheets, copper materials and stainless steel materials that are difficult to adhere. It is generally used in coatings that are directly in contact with the substrate. During baking and curing, the additive can form an allyl complex structure with the metal surface, resulting in unique adhesion and impact resistance. The cross-linking and curing of the film has a good catalytic effect, which significantly improves the T-bend toughness, MEK wipe resistance, water cooking resistance and chemical resistance of the coating.
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