Low Friction Squeak Free Assembly

摘要

A tribologically modified polyoxymethylene polymer composition is disclosed. The polyoxymethylene polymer composition is comprised of a polyoxymethylene polymer and at least one tribological modifier. The tribological modifier may comprise an ultra-high molecular weight silicone having a kinematic viscosity of greater than 100,000 mm2 s−1. When tested against itself, the composition of the present disclosure exhibits an extremely low dynamic coefficient of friction and produces no discernible noise over a very broad temperature range, such as from −20° C. to 60° C.

主权项

1. A low friction assembly comprising:
a first sliding member in operative association with a second sliding member, the first sliding member and the second sliding member being configured to remain in contact and move relative to each other, each sliding member comprising a molded polymeric article, the first sliding member being made from a first polymer composition comprising a polyoxymethylene polymer combined with an ultrahigh molecular weight silicone, the second sliding member being made from a second polymer composition comprising a polyoxymethylene polymer combined with an ultrahigh molecular weight silicone, the ultrahigh molecular weight silicone being present in the first polymer composition and the second polymer composition such that when the polymer compositions are tested against each other, the compositions exhibit a dynamic coefficient of friction of less than about 0.06 when tested at a temperature of 60° C. and at a sliding speed of 8 mm/s.