FIELD: technological processes.
SUBSTANCE: invention relates to rubber industry and can be used for external layer of sealing elements in water-swellable packers used in oil and gas industry. Rubber mixture contains butadiene-nitrile rubber with nitrile of acrylic acid content of 17–20 %, isoprene rubber SKI-3, ethylene-propylene rubber SKEPT-40, sevylene 11808-340, sulfur, 2,2'-dibenzothiazole disulphide, guanide F, zinc white, stearic acid, acetonanil H, technical carbon P 514, rosil 175, talc, finely powdered mineral powder of schungite, rosin, needle-punched fabric "Oxipan", polyacrylamide AK 639, sodium polyacrylate and reagent "Cometa-R".
EFFECT: improved index of relative elongation at break of rubber and increased degree of its volumetric swelling in water.
1 cl, 2 tbl
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Authors
Dates
2019-09-06—Published
2019-03-25—Filed