Study on Deterioration of Water Repellency

Abstract

Experimental testing of water-repellent materials under water-dipping conditions showed that a coating with less than 60% added polytetrafluoroethylene (PTFE) particles is deteriorated of its water repellency while one with more than 80% added PTFE particles is not. It is probably because of the differences in the surface structures of coatings. And, by controlling the dispersion of PTFE particles in the coating by the addition of perfluoroalkyl oxide, deterioration of coating water repellency is prevented.