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AIR DRYING, HIGH TEMPERATURE RESISTANT, SILICONE PROTECTIVE COATINGS
Rept. for Jul 1962-Oct 1967
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH
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Improved high temperature protective coatings primarily for use on high speed Mach 3 aircraft and missiles have been developed which are capable of withstanding the extreme environments and aerodynamic heating. By selectively incorporating aminosilanes as catalysts for curing unmodified polymethylphenyl silicone resins, air dry ambient temperature, stable coatings with retained reflectances exceeding eighty 80 percent after elevated temperature exposures were developed. Analysis of two years Florida weathering data indicates that these coatings when properly applied to titanium, stainless steel and aluminum alloys have excellent adhesion, corrosion resistance, and are extremely resistant to solar discoloration thus making them excellent candidates for high speed aircraft and missiles. A variety of air dry silicone primer systems were also developed, evaluated for thermal stability and corrosion resistance, and optimized for the best topcoats formulated. Based on the laboratory and Florida weathering results, a silicone-base coating system which will dry under ambient temperature conditions 75 2 deg F, and serviceable for use up to 700 deg F for short periods and 600 deg F for prolonged periods has been developed. Author-PL.
APPROVED FOR PUBLIC RELEASE