| 摘要 |
FIELD: oil and gas industry. ^ SUBSTANCE: method involves manufacture of granules, application of polymeric coating to them. The coating is applied in layers. First, to granules there applied is layer of liquid cold-curing phenol-formaldehyde resin; then fine mixture of dry resol and novolac phenol-formaldehyde resins in the following ratio, wt %: resol resin 80-90, novolac resin 10-20 to which there applied is layer of liquid cold-curing phenol-formaldehyde resin at mass ratio of external liquid coating to dry phenol-formaldehyde resin in terms of dry matters, which is 1:2. Invention is developed in dependent claims. ^ EFFECT: increasing adhesion strength of proppants to polymeric coating. ^ 4 cl, 1 ex, 1 tbl |
