TEST PROGRAM ON DURABILITY OF AIRCRAFT COATINGS
MCCRONE (WALTER C) ASSOCIATES INC CHICAGO IL
Pagination or Media Count:
A laboratory investigation was conducted to develop methods for rapidly determining paint coating resistance to oxidation and photochemical degradation. The ultimate objective is development of a rapid test for expected life of paint coatings. Accelerated aging of paint films has been achieved using ultraviolet radiation and oxidizing atmospheres. The resulting gases given off by the films have been analyzed by gas phase chromatography. The chemical nature of the paint film can be identified by this means, and the actual compounds evolved by a series of films have thus been identified. Interestingly enough, most belong to a homologous series of methyl ketones acetone, methyl ethyl, methyl propyl, methyl butyl and methyl pentyl, although methanol, water, carbon monoxide and carbon dioxide were also found. A study of polyurethane films of known history showed a good relationship between service life for each film and the chemical composition of the gases evolved. Further work is in progress to confirm these promising results and to extend the study to other paint compositions.
- Coatings, Colorants and Finishes