COMPOSITE EXTENDER IN THE FORM OF POWDER AND A METHOD FOR PREPARATION THEREOF Russian patent published in 2008 - IPC C09C3/10 C09K3/22 C08J5/16 

FIELD: polymer materials.

SUBSTANCE: invention provides powdered composite extender for elastomer materials intended for manufacturing articles operated under dry friction or increased wear conditions and applied in engine, compressor, and pump manufacture industries as well as in other industry fields. Extender particles contain at least one metal oxide nucleus and polymeric shell of thermoplastic having modulus of elasticity between 1.5 and 5.0 GPa, volume percentage of nuclei in extender particle ranging from 1 to 10%. Method of preparing composite powder extender consists in that metal oxide particles are activated in mechanochemical activator at mechanical energy supply intensity 1 to 5 kW/kg and dose from 30 to 1000 kJ/kg in medium selected from air, nitrogen, argon, and vacuum between 1 and 10-2 atm to obtain particles with average size no higher than 15 μm, after which shell polymer is added to mechanochemical activator and metal oxide particles are modified with intensity of mechanical energy supply from 1 to 5 kW/kg and dose from 30 to 100 kJ in above indicated medium.

EFFECT: reduced coefficient of friction and lowered summary rate of wear of friction couple under hydroabrasive wear conditions.

4 cl, 2 dwg, 3 tbl