POLYMER-COATED PROPPANT Russian patent published in 2010 - IPC C04B35/00 C09K8/80 C04B41/83 

FIELD: chemistry.

SUBSTANCE: invention relates to production of ceramic proppants designed for use in oil industry when extracting oil through hydraulic fracturing. The polymer-coated proppant is in form of ceramic granules with a polymer coating consisting of a hardened epoxy resin (ER) with polyethylene polyamine (PEPA) in which a mixture of particles of hexamethylenetetramine (HMTA) and phenol formaldehyde novolac resin (PFNR) is embedded, where the said mixture has particle size of 100-120 mcm and also contains solid particles of phenolformaldehyde resol resin (PFRR) with size of 5 mcm or less, taken in the following ratio in wt %: said PFNR 50-70, said PFRR 30-50, with ratio of ER with PEPA and mixture of PFNR with HMTA and with PFRR (per dry substances) between 1.5:1 and 1.5:3. The invention is developed in subclaims.

EFFECT: increased adhesion strength of polymer-coated proppants used at temperature above 80°C.

4 cl, 2 ex, 2 tbl