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THE DEVELOPMENT OF HEAT-RESISTANT PAINTS FOR METALS
SOUTHERN RESEARCH INST BIRMINGHAM ALA
Progress is reported on the preparation and evaluation of air-drying heat-resistant coatings for metal surfaces. The coatings are made by reacting P compounds with metal oxides or ceramic frits. Coatings based on ZnO, dimethyl hydrogen phosphite, and ethyl acid phosphate with small amounts of colloidal silica had higher gloss and were harder than the same coatings without the silica. These coatings also had excellent heat resistance. Wetting agents in metal oxide-organo phosphorus coatings cause the coatings to blister when subjected to high heat. In the system ZnO-dimethyl hydrogen phosphite-ethyl acid phosphate, the ratio of the solid to the liquid components was a major factor in determining the physical properties of the coating. Coatings made from mixtures high in ZnO and low in the liquid P compounds were brittle. Coatings made from mixtures low in ZnO and high in P compounds were soft but had high gloss. Author