Water-resistant,oil-based,intumescing fire-retardant coatings. I. Developmental formulations

Water-resistant, in tumescing fire-retardant paints have been formulated from different types of chemically modified oil-based vehicles, carbonific polyurethanes, spumific melamine phosphates, spumific organohalophosphorus compounds, additives, pigments, driers and solvent. The synthesis of their three major components—the vehicle itself, the spumific melamine phosphates and the carbonific polyurethanes—is described. As a result of evaluation in the standard fire-test cabinet and in the Underwriters' Laboratories' 25-ft tunnel furnace, the formulation whose vehicle has a higher content of tung oil and whose carbonific components are less thermoplastic appear to be most promising. However, these research results have again manifested the importance of the contribution ofeach component in achieving effective fire retardance. Presented in part at the 6th Annual Symposium on New Coatings and New Coatings Raw Materials, Fargo, N.D., 1964; and presented at the AOCS Meeting in Chicago, 1964. So. Util. Res. & Dev. Div., ARS, USDA.