Tuesday, July 10th, 2012
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Chemical resistance for zero-VOC water-based epoxy topcoat
The new zero-VOC water-based epoxy topcoat has excellent resistance to a wide variety of industrial and household chemicals. Results of chemical resistance spot tests run in accordance with ASTM D 1308 (Table 1) shows the zero-VOC epoxy topcoat resists acids, bases, industrial solvents such as ketones, alcohols, glycol ethers, and aliphatic and aromatic hydrocarbons and various other chemicals such as bleach, motor oil and brake fluid. Reagent Concrete 10% Hydrochloric acid Good 10% Nitric acid Good 10% Phosphoric acid GoodRead More …
Binder System for Water-based epoxy
Water-based epoxies used in conventional protective coating formulations are based on two principal technologies, i.e., liquid epoxy self-emulsifying systems and solid epoxy dispersion systems.With epoxy equivalent weight ranging from 175 to 240,liquid epoxy self-emulsifying systems are very rich in epoxide groups. The combination of concentrated epoxides and amine hydrogens in the same emulsion particle provides coatings with high crosslink density and good chemical and abrasion resistance, but very short usable pot life, low flexibility and low impact resistance. These filmsRead More …
A zero-VOC water-based epoxy topcoat has been formulated
Since 1982, when the first bisphenol A-based solid epoxy dispersion and modified amine system came to market as an adduct suitable for metal protection, water-based epoxy systems have been used for high-performance industrial primers and topcoats over metal due to their fast dry time, corrosion resistance, good pot life and low odor. Although water-based epoxy has successfully replaced traditional solvent-based epoxy/polyamide coatings in many high-performance industrial applications, the VOC content of these water-based epoxies is typically 200-350 g/L. So now,Read More …
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