Investigation of Composite-Coating Systems for Rain-Erosion Protection

An investigation of composite coatings that consist of a soft polyurethane overcoated with a hard polyurethane was made to determine the resistance of the coating to high-speed waterdrop impingement, the pressure felt through the coating as a consequence of a 6standard6 impact, and the resilience of...

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Bibliographic Details
Main Authors: Engel,Olive G, Piekutowski,Andrew J
Format: Report
Language:English
Subjects:
Coatings, Colorants and Finishes
EROSION
IMPACT SHOCK
ISOCYANATES
PLASTIC COATINGS
SHOCK RESISTANCE
WATER EROSION
WATER IMPINGEMENT
WEAR RESISTANCE
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Summary:An investigation of composite coatings that consist of a soft polyurethane overcoated with a hard polyurethane was made to determine the resistance of the coating to high-speed waterdrop impingement, the pressure felt through the coating as a consequence of a 6standard6 impact, and the resilience of the coating. A first result of the study was that composite coatings outperform single-layer coatings of the same thickness and same materials in resisting high-speed waterdrop impingement. The conclusiveness of this result is obscured by the erratic failure behavior of polyurethane coatings and by the finding that coatings that were sprayed at different times were not comparable. Both the resilience of composite coatings of different (hardcoat thickness)/(softcoat thickness) ratio and the pressure felt through these coatings were found to be intermediate between the value found for a single-layer coating of the hardcoat material and that found for a single-layer coating of the softcoat material. Some evidence was found in support of the postulate that pressure at the substrate as a consequence of a standard impact is less for a composite coating than for a single-layer coating of the same thickness. (Author-PL)