Vinyl ester resin is a class of resin used for corrosion resistance in the heavy-duty lining field. Its molecular chain carries epoxy groups at both ends and an unsaturated ester structure in the backbone, so it combines the adhesion and mechanical strength of epoxy with the rapid curing characteristics of unsaturated polyester. The double bonds sit at the chain ends and the density of hydrolyzable ester bonds is low, giving hydrolysis stability higher than ordinary unsaturated polyester; this is why it withstands strong acids, strong alkalis, oxidizing media and organic solvents. Typical applications are tank and reactor linings, flue gas desulfurization absorber towers and ducts, scrubbers, chemical wastewater basins, flooring, secondary containment, and other highly corrosive locations. Three common forms: vinyl ester resin primer and topcoat (used together as a system), vinyl ester glass flake coatings incorporating glass flake (parallel flake orientation extends the permeation path of the medium, with high permeation resistance, the primary type for FGD tower and acid tank linings), and phenolic vinyl ester combined with phenolic systems (balancing solvent resistance and high-temperature resistance). Selection is governed by the type and concentration of the specific chemical medium, the operating temperature, and whether abrasion resistance or permeation resistance is required; an order shall not be placed on the basis of the term acid-resistant alone. Application is mostly two-component solvent-free types, with strict requirements on surface preparation grade, curing agent ratio, ambient temperature and humidity; thick-film linings require multiple coats and spark testing for holidays.
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