WATER-REPELLENT AND OIL-REPELLENT COATING, AND FORMATION METHOD THEREOF

摘要

A water-repellent and oil-repellent coating, which can exert high water-repellency and oil-repellency not only at ordinary temperature, but also even after exposure to a high temperature and whose environmental burden is low, is formed by dehydration condensation of perfluoroaryl trisilanol (at least one fluorine atom in its perfluoroaryl group may be substituted with a trifluoromethyl group) having a molecular structure in which not only functional groups which presents a surface energy, such as a methylene group, a methylene group, an ether linkage (oxygen atom), a carbonyl group, etc., but also a difluoromethylene (—CF2—) group have been eliminated.

主权项

1. A water-repellent and oil-repellent coating formed on a surface of a substrate,
wherein: said coating has a siloxane skeleton, at least one or both of a 4-trifluoromethyl-2,3,5,6-tetrafluorophenyl group and a perfluorophenyl group is bonded with a silicon atom which constitutes said siloxane skeleton, through an aromatic-carbon atom, a silicon atom which constitutes said siloxane skeleton is bonded with the surface of said substrate through an oxygen atom which does not constitute said siloxane skeleton and wherein the perfluoroalkylaryl group does not include a methylene group, an ether linkage, a carbonyl group, or a difluoromethylene (—CF2—) group, and a decreasing rate of a contact angle to water on the surface of said water-repellent and oil-repellent coating is 16.5% or less and a decreasing rate of a contact angle to hexadecane on the surface of said water-repellent and oil-repellent coating is 19.0% or less, when holding said water-repellent and oil-repellent coating in an atmosphere at 400° C. for 1 hour.