Investigation of White, Thermally-Stable, Rain Erosion Resistant Protective Materials.
Final rept. 21 Mar 73-15 May 75,
GOODRICH (B F) ENGINEERED SYSTEMS CO AKRON OHIO
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An investigation was conducted to develop a heat-resistant white compound for use as a rain erosion protective material. Using a black EPR compound with a peroxide cure system as the starting point, white pigments to replace the carbon black were evaluated. These pigments were evaluated for color, effect on rain erosion, and electrical properties. From the pigments evaluated, zinc oxide and titanium dioxide were selected for extensive testing to determine the optimum quantities to be used. Compounds containing zinc oxide provided the best erosion resistance - in excess of 50 minutes when tested at 500 mph in 1 inchhour rainfall-and dielectric properties. At 8.4G Hz the dielectric constant was 2.49 and the loss tangent was .0155. However all compounds evaluated had poor heat resistance. The heat resistance was significantly improved with the addition of Antioxidant MB such that practically no reduction in physical properties occurred after 24 hours at 350F. Therefore, an EPR compound containing zinc oxide as the principal white pigment and having Antioxidant MB will provide a suitable heat-resistant white rain erosion protective material.
- Coatings, Colorants and Finishes