ANTIFRICTION COAT Russian patent published in 2009 - IPC C09D179/08 C08J5/16 B05D5/08 

FIELD: chemistry.

SUBSTANCE: antifriction coat can be used in gear pumps for reducing friction and wear resulted from corrosion or mechanical effects in tribojoints under effects of chemically active reagents, high temperature and loads on engaged parts to ensure required stable gaps between the said parts. The antifriction coat consists of three layers, i.e. inner, intermediate and upper layers. Note here that the inner layer represents a composition comprising 90 wt % of a polyimide varnish and 10 wt % of chromophosphatealuminic bond, the intermediate layer being made from 100 wt % of a pure polyimide varnish. Finally, the top layer represents a composition containing 90 wt % of polyimide varnish, 8 wt % of colloid graphite and 2 wt % of lecithin. Thickness of the aforesaid inner layer is within the limits of from 8 up to 10 mcm, thickness of the intermediate layer is within the limits of from 16 up to 20 mcm, thickness of the top layer is within the limits of from 24 up to 30 mcm, while the required thickness of the coat is provided by grinding the top layer.

EFFECT: longer life of friction assembly units and parts operated in chemically active environments.

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