Development of a compounding of elastomeric composition for production hoses

The compounding of elastomeric compositions increased hardness for the production of hoses coiling constructions is worked out. The studies found, that the introduction of technical carbon P 803 in the amount of 105 parts by weight at 100 parts by weight of rubber leads to a slight increase in the viscosity of the rubber composition, hardness and tensile strength, a slight decrease in elongation at break. Introduction of technical carbon P 803 in the amount of 110 parts by weight at 100 parts by weight of rubber results in an increase in the viscosity of the rubber composition, hardness and tensile strength of conventional on 4%, reduction in elongation at break on 4%. Introduction of technical carbon P 803 in the amount of 115 parts by weight at 100 parts by weight of rubber results in the increase in the viscosity of rubber mixture on 6%, the hardness on 13%, decline of tensile strength and elongation at break on 6%. Reducing the value of the conditional indicator tensile strength and a significant increase in hardness indicates an excess of carbon content in the rubber composition, the content of carbon technical P 803 therefore optimal 110 parts by weight at 100 parts by weight of rubber. Decline of maintenance of dibutyl phthalate to 8 parts by weight rendered unsatisfactory technological behavior of mixture at roll-forming, that hampered dispergating of ingredients at mixing. Thus we have found that the optimum content of the plasticizer in the rubber mixture of dibutyl phthalate – 10 parts by weight softener and bitumen – 5 parts by weight at 100 parts by weight of rubber