Aspects of Soil-Detergent Interactions Related to Testing of Improved Aircraft Cleaners.

摘要

A reproducible and sensitive laboratory cleaner evaluation test was developed which simulates real aircraft cleaning situations. The model surface which was developed, a polyurethane painted aluminum panel,is a realistic simulation of aircraft surfaces,having the surface free energy (from artificial weathering) and topography (induced scratches) found on in-service polyurethane painted aircraft. The model soil has physical and chemical characteristics essentially equal to actual soil taken from in-service aircraft. The model emulsion cleaner,for use as a standard in the test,was formulated with selected surfactants to enhance the roll-back cleaning mechanism,and a solvent system with a solubility parameter near that of aircraft soil to provide good fluidization of the tar-like soil. A controllable mechanical method for scrubbing test panels,and an optical method for evaluating cleanness were developed to give the best possible chance of correlation with practical cleaning and visual inspection of aircraft. (Modified author abstract)