Final rept. 16 Jul 1973-15 Jul 1974
LEHIGH UNIV BETHLEHEM PA CENTER FOR SURFACE AND COATINGS RESEARCH
Pagination or Media Count:
The purpose of this work was to develop water-based analogs of existing solvent-based epoxy primer and polyurethane topcoat systems. The approach was to prepare aqueous emulsions of both epoxy and polyurethane system components using the anionic sodium lauryl sulfate-cetyl alcohol or cationic hexadecyltrimethyl-ammonium bromide-cetyl alcohol combinations as emulsifier. Fluid, stable anionic and cationic emulsions of the epoxy resin dissolved in solvents were prepared using the mixed emulsifier combination and simple stirring, followed by ultrasonic irradiation or homogenization. The solvent- stripped epoxy resin and curing agent emulsions were mixed in various proportions and cured at room temperature or 50 deg C. For preparation of polyurethane emulsions, the isocyanate prepolymer was pre-reacted to give adducts that were emulsified using the anionic mixed emulsifier combination and simple stirring, followed by ultrasonic irradiation or homogenization.
- Organic Chemistry
- Coatings, Colorants and Finishes