Accession Number:

AD0272780

Title:

THE DEVELOPMENT OF HEAT-RESISTANT PAINTS FOR METALS

Descriptive Note:

Corporate Author:

SOUTHERN RESEARCH INST BIRMINGHAM ALA

Personal Author(s):

Report Date:

1961-12-18

Pagination or Media Count:

1.0

Abstract:

The ZnO-dimethyl hydrogen phosphite DMHP-ethyl acid phosphate EAP coating systems were studied. ZnO made by the French process, which has modular-shaped particles, produced smoother ZnO-DMHP-EAP coatings than ZnO made by the American process, which has acicular-shaped particles. It was found that addition of water to coating mixtures of this type accelerated reaction and resulted in harder, better-bonded coatings. Application of several thin coats of ZnO-DMHP-EAP compositions produced coatings with better properties than application of a single thick coat. Overcoating ZnO-DMHP-EAP coatings with colloidal silica increased the hardness, glossiness, and heat-resistance of the coatings. The use of silicates in the reaction mixtures was not promising. Other metal oxides showed no advantage over ZnO in a re-evaluation of coatings prepared with the organophosphorus compounds. Frit 1 also remains the best frit yet produced for preparing heat-resistant coatings from frits and organophosphorus compounds. The effective potlife of the ZnO-DMHP-EAP reaction mixture was about 15 min. Most of the curing of the coating apparently takes place during the first 90 min after application. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE