POLYAMIDE-BASED COMPOSITE POLYMER ANTIFRICTION MATERIAL Russian patent published in 2014 - IPC C08J5/16 C08L77/00 C08L77/02 C08K3/04 C08K7/02 B82B3/00 

FIELD: chemistry.

SUBSTANCE: invention relates to mechanical engineering and particularly to a polyamide-based composite polymer antifriction material used to make articles for different tribological purposes, e.g. friction bearings, and for making articles for the braking system of rail passenger or cargo transport. The polyamide-based composite polymer antifriction material contains fibre filler in the form of carbon fibre or a mixture of carbon fibre and glass fibre. The composite polymer antifriction material further contains randomly arranged carbon nanotubes in form of single-layer or multilayer, with 2-70 layers, or interleaved, rolled graphite planes with 2-70 layers. The external diameter of the carbon nanotubes ranges from 0.1 to 100 nm and their length ranges from 1 to 70 mcm. The polyamide of the base of the composite polymer antifriction material used is polyamide 6 or Caprolon V or Ertalon. Content of glass fibre in the mixture thereof with carbon fibre of the fibre filler of the composite polymer antifriction material ranges from 3.48 to 10.5 wt %, with the following quantitative content of components, wt %: carbon fibre or mixture of carbon fibre and glass fibre 9.7-42.4, carbon nanotubes 0.05-0.55, polyamide - the balance. The carbon fibre in the composite material is carbon fibre made from high-molecular weight hydrated cellulose fibre or from polyacrylonitrile fibre. The carbon fibre of the composite polymer antifriction material is used in form of bundles or chopped bundles or chopped tape, and the glass fibre is used in form of chopped threads. The length of the chopped bundles or tape of the carbon fibre and chopped threads of the glass fibre ranges from 1 mm to 48 mm. The technical result is longer service life of articles made from the disclosed polyamide-based composite polymer antifriction material, low intensity of linear wearing in case of friction on a polished steel pair made of steel 40X.

EFFECT: high stability of friction coefficient on counter-body material made of steel 40X, high stress at break, maintaining Charpy impact strength on samples without dent while maintaining a given ultimate compression strength and low friction coefficient.

3 cl, 2 tbl