Civil Engineering Reference
In-Depth Information
Table 3.
(Cont'd.)
Name
Characteristics
Based on organic unsaturated polyester dissolved in unsaturated monomer; cured by free radical reaction catalyzed
by peroxide; used mainly for lining due to their good acid and chemical resistance.
Polyesters and vinyl esters
Resin is dispersed in water to form water emulsion; acrylic is major resin type; one-component materials; cure by
solvent evaporation followed by coalescence of the resin particle; used as protective and architectural coatings in
the form of primers, intermediate coats, and topcoats; high moisture vapor transmission rates; good to protect
wood or concrete where moisture must be allowed to pass through the coating; cannot be used on steel without
anticorrosive pigments, but are used in mild weather to protect steel; used as overcoats for oil-based or alkyd
coatings because of low shrinkage.
Water-borne acrylic
(or acrylic latex)
(Chemically cured):
The isocyanate (-N=C=O) group is used to cross-link the resin (curing type); cured PU
available in two separate containers; chemically cured PU has good water and chemical resistance; aliphatic
urethanes have good gloss and color retention.
Urethanes
