The article investigated the effect of caoutchoucs, sevilen 11808-340, vulcanizing groups, fillers, plasticizers, directional ingredients on the physicomechanical (conditional tensile strength, elongation at break, hardness, rebound elasticity, tear resistance) and operational properties of two rubbers (changes of conditional tensile strength of rubbers after exposure to water, weight changes after aging of rubbers in a solution of citric and hydrochloric acids, changes in the volume of rubbers after exposure to water). These rubbers are developed for the manufacture of the outer and inner layers of water-swelling sealing elements (WSSE) for the oil and gas industry. It has been established that rubber for the outer layer of WSSE based on butadiene-nitrile BNKS-18AMN, isoprene SKI-3 and ethylene-propylene SKEPT-40 caoutchoucs, as well as rubber for the inner layer of WSSE based on butadiene-nitrile BNKS-18AMN, butadiene-methyl styrene SKMS-30AR and ethylene-propylene SKEPT-40 caoutchocs possess the required physical-mechanical and operational properties. It was shown that these rubbers containing a vulcanizing group sulfur + thiazole 2 MBS, sevilen 11808-340, a combination of carbon black T 900 with rosil 175, talc and Karelite MK, petroleum resin “Sibplast”, vermiculite and igloprobivnoe cloth, a combination of hydrosorbtional polyacrylamide 639, sodium polyacrylate, perlite and Kometa-R reagent are characterized by improved physicomechanical and operational properties. These rubbers can be recommended as the basis for the manufacture of the outer and inner layers of water-swellable sealing elements.

The influence of rubbers, trans-polynorbornene, polyisobutylene P-200 and sevilene on vulcanization characteristics, physical-mechanical and dynamic properties of rubber used for the manufacture of products in contact with sea water has been investigated. It has been established that the developed rubber with a sulfur vulcanizing system based on rubbers SKMS-30ARK, SKN-4065 and BK-1675 with additives of trans-polynorbornene and sevilene 11808-340 has improved physical and mechanical characteristics, resistance to sea water and increased dynamic properties

No abstract

The effect of hydrophilic additives – MC-2000 methyl cellulose and sodium polyacrylate – on the properties of a vulcanisate based on Neoprene W was studied. The rubber mixes were prepared in two stages: at the first stage, hydrophilic additives were introduced into the rubber; at the second stage, the remaining ingredients were introduced. Vulcanisation was carried out at a temperature of 150°C for 30 min. The viscosity of the rubber mixes, M, was measured at 120°C on an MVR 3000 Basic viscometer (MonTech), and the vulcanisation characteristics and vulcanisation rate, v, were measured on an MDR 3000 Basic rheometer (MonTech) at 170°C in accordance with ASTM D2084-79. From the results of these measurements it follows that, with the combined use of methyl cellulose and sodium polyacrylate, there is a synergistic reduction in M and in the vulcanisation rate of the rubber mixes. A vulcanisate containing both hydrophilic additives possesses the best hydrosorption properties and has satisfactory physicomechanical properties (nominal tensile strength, elongation at break, hardness, and tear strength). The values of these properties and their changes on exposure of the vulcanisate to distilled water (70°C, 24 h) meet the requirements laid down for water-swelling rubber sealing elements.

In the article two rubber mixtures are studied: rubber 7NO-68-1SK based on a combination of butadiene-nitrile caoutchouc BNKS-18AMN with chloroprene caoutchouc neoprene W and rubber 81-453 based on a combination of butadiene-nitrile caoutchouc BNKS-40AMN, butadiene caoutchouc SKD, butadiene-methylstyrene caoutchouc SKMS-30 ARK and sevilene 11808-340. The purpose of the study was to improve the physical-mechanical and operational properties of both rubber mixtures by using fine powdered schungites Taurit TS-D, Psh-5 and PSH-20 in their composition. To assess the kinetics of vulcanization of rubber mixtures, the following were determined: the minimum and maximum torques; start time, optimum time, time achieving maximum vulcanization rate and maximum of vulcanization rate. To assess the physical-mechanical properties, we determined: the conditional tensile strength; elongation at break; hardness and relative residual deformation after compression. To evaluate the performance properties of rubbers, the following was determined: the change in the relative tensile strength; change in elongation at break and change in mass after aging of vulcanizates in a standard liquid SZHR-1, isooctane + toluene mixture, as well as in gasoline and industrial oil I-20A. It is shown that for the rubber mixture 7-NO-68-1SK a partial replacement of carbon blacks P 803 on the schungite PSH-5 in an amount of 15 parts by weight leads to an improvement in the rheometric parameters, physico-mechanical and operational properties of vulcanizates. For the rubber mixture 81-453, partial replacement of the persil 175 on shungite PSH-5 also allows improving the rheometric properties and increasing the physico-mechanical and operational parameters.