RUBBER COMPOUND BASED ON NITRILE RUBBER Russian patent published in 2023 - IPC C08L9/02 C08K3/04 C08K3/06 C08K3/20 C08K3/26 C08K5/09 C08K5/10 C08K5/44 

FIELD: rubber industry.

SUBSTANCE: invention relates to the rubber industry, in particular to the composition of the rubber mixture based on nitrile rubber for the manufacture of sleeves. Rubber compound based on nitrile rubber for the manufacture of sleeves includes nitrile butadiene rubber grade BNKS-18 AMN, a vulcanizing group consisting of sulfur and N-cyclohexylbenzothiazosulfenamide-2, carbon black P514 and chalk MMS-1, zinc oxide, technical stearin, dibutyl phthalate and oligoetheramide terephthalic acid with an average degree of polymerization n equal to 7-11 in the following ratio of the components of the rubber mixture, wt.%: nitrile butadiene rubber BNKS-18 AMN - 50.0; N-cyclohexylbenzothiazosulfenamide-2 - 1.8; sulfur 2.5; carbon black P514 - 75.0; chalk MMS-1 - 30.0; zinc oxide - 4.0; technical stearin - 2.0; dibutyl phthalate - 5.0÷15.0; oligoetheramide of terephthalic acid 5.0÷20.0. Terephthalic acid oligoetheramide obtained by polycondensation of the product of aminolytic degradation of polyethylene terephthalate - N, N'-bis (2-hydroxyethyl) terephthalamide. The introduction of oligoetheramide of terephthalic acid leads to a decrease in the viscosity of raw rubber compounds, accelerates the process of sulfur vulcanization and increases the relative elongation at break of the finished vulcanizates.

EFFECT: development of a rubber compound based on butadiene-nitrile rubber, which has increased elastic-strength properties with a shorter vulcanization time.

1 cl, 1 dwg, 2 tbl, 5 ex