ONE-COMPONENT, LOW VOC, AMBIENT CURE ARCHITECTURAL COATINGS FORMULATED USING CAM ACRYLIC LATEXES

摘要

The current drive to develop low VOC architectural coatings includes focused research into one-component, ambient curable latexes. This motivation is stimulated by regulations to reduce solvent usage in architectural coatings, and customer desire to reduce the odor. Castor Acrylated Monomer (CAM) is a novel monomer derived from a renewable resource that marries two coatings technologies ― high molecular weight latexes with oil-modified polyesters. CAM polymer performance has been examined with relevance to both in-house and commercial latex controls, and CAM ambient cure crosslinking has been proven using DSC. Glass transition temperature (T_g) increase differed with cure temperature, and the T_g was found to increase 2, 6, and 12°C with 5, 10, and 15 phm CAM, respectively, at ambient temperature. The maximum degree of cure was achieved within 43 hours at ambient temperature. CAM coating T_gs were found to increase proportionally in magnitude with latex film T_g. CAM ambient curing was found to improve block resistance and dirt pickup resistance such that higher CAM-containing latex coatings rivaled the commercial control even though its T_g was 12°C higher. Thus, CAM polymers provide ambient crosslinking and solvent reduction in architectural coatings while utilizing a renewable resource.