Low-Wear Fluoropolymer Composites

摘要

A low-wear fluoropolymer composite body comprises at least one fluoropolymer and additive particles dispersed therein. Also provided is a process for the fabrication of such a fluoropolymer composite body. The composite body exhibits a low wear rate for sliding motion against a hard counterface, and may be formulated with either melt-processible or non-melt-processible fluoropolymers.

主权项

1. An article having a surface, wherein the surface comprises a film layer, wherein the film comprises a fluoropolymer in admixture with particulate filler material, characterized in that the fluoropolymer comprises carboxylic acid and/or carboxylate functionality, and wherein the filler particles, prior to combination with the fluoropolymer, are characterized by:
(a) an irregular shape, and (b) a size distribution as determined by dynamic light scattering wherein a d50 value by volume is about 50 nm to about 500 nm, and/or a size distribution as determined by static light scattering wherein a d50 value by volume is about 80 nm to about 1500 nm;and wherein the article surface demonstrates a steady state wear rate of at most about 5×10−7 mm3/N-m and a coefficient of friction of less than about 0.3, as measured on a tribometer using a Type 304 stainless steel counterface having a surface roughness characterized by a value of about R(rms)=161 nm with a standard deviation of 35 nm, and with the article under a loading of 6.25 MPa and in reciprocating motion at a velocity of 50.8 mm/s