Protective Coatings for Front-Surface Reflectors. Phase I. Final Report

摘要

Silicone resins were evaluated as protective coatings for front surface aluminum and silver reflectors. The solar weighted hemispherical reflectances and specular reflectances of float glass squares metallized with silver and aluminum and protected with silicone coatings were measured. The float glass squares metallized with silver and aluminum were highly reflective. The total reflectances of the silver samples were 5 to 7% higher than the aluminized samples. The resin coated aluminum samples were much more specular than the silver samples. Coupling agents used to improve the adhesion of the protective silicone resin coating to the silver surface adversely affected the specularities. The reflectances of the aluminumized squares were remeasured after 500 hours exposure in an Atlas Filtered WeatherOmeter. Front surface aluminum reflectors can be protected with silicone resin coatings. (ERA citation 07:063270)