Study of Aliphatic Diisocyanate Cured Polyurethanes and Diisocyanate-Polyamine Polyurea Coatings

摘要

Two package gloss, semi-gloss and lustreless coatings using an aliphatic diisocyanate cured polyurethane and a polyurea vehicle were formulated into white and olive drab colors. These finishes were evaluated for general performance in corrosion resistance, some chemical, hydraulic fluid and organic solvent resistance and weathering characteristics. The polyurethanes offer good protective and resistance properties and the alphatic diisocyanate cured polyurethanes have the additional advantage of extended gloss and color retention for exterior use as compared to aromatic cured urethanes and polyureas. However, water sensitivity and film brittleness may be a negative factor. The polyurea coatings offer less chemical and solvent resistance than the polyurethanes, but are more flexible and possess good water resistance. Exterior exposure properties are similar to alkyd type enamels. (Author)