LOW-FRICTION FLUORINATED COATINGS

摘要

Low-friction fluorinated coatings are disclosed herein. A preferred low-friction material contains a low-surface-energy fluoropolymer having a surface energy between about 5 mJ/m2 to about 50 mJ/m2, and a hygroscopic material that is covalently connected to the fluoropolymer in a triblock copolymer, such as PEG-PFPE-PEG. The material forms a lubricating surface layer in the presence of humidity. An exemplary copolymer comprises fluoropolymers with average molecular weight from 500 g/mol to 20,000 g/mol, wherein the fluoropolymers are (α,ω)-hydroxyl-terminated and/or (α,ω)-amine-terminated, and wherein the fluoropolymers are present in the triblock structure T-(CH2—CH2—O)—CH2—CF2—O—(CF2—CF2—O)m(CF2—O)n—CF2—CH2—(O—CH2—CH2)p-T where T is a hydroxyl or amine terminal group, p=1 to 50, m=1 to 100, and n=1 to 100. The copolymer also contains isocyanate species and polyol or polyamine chain extenders or crosslinkers possessing a functionality of preferably 3 or greater. These durable, solvent-resistant, and transparent coatings reduce insect debris following impact.

主权项

1. A copolymer composition comprising:
(a) fluoropolymers having an average molecular weight from about 500 g/mol to about 20,000 g/mol, wherein said fluoropolymers are (α,ω)-hydroxyl-terminated and/or (α,ω)-amine-terminated, and wherein said fluoropolymers are present in the triblock structure: wherein: X, Y═CH2—(O—CH2—CH2)p-T, and X and Y are independently selected; p=1 to 50; T is a hydroxyl or amine terminal group; m=1 to 100; and n=1 to 100; (b) one or more isocyanate species possessing an average isocyanate functionality of about 2 or greater, or a reacted form thereof; and (c) one or more polyol or polyamine chain extenders or crosslinkers possessing an average functionality of about 3 or greater, or a reacted form thereof.