Properties of Rubber Compounds and Vulcanizates Based on NR and Modern Grades of IR with Introduced During Mixing NFA Modifier
Published 2024-12-23
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Abstract
At the laboratory equipment (mills, the HAAKE mixer with volume of 47,5 cm3) the model and used in the tire industry Rubber Compounds, based on NR, and on domestic kinds of IR, modified at the first stage of laboratory mixing by the composition «NFA-gr modifier» (80 % p-nitrosodiphenylamine) in dust-free, granulated form were made. «Green strength» properties of unvulcanized compounds and also physical-mechanical properties of their vulcanizates (FMP) were studied. Measurements of tgδ in the range of temperatures from –45 to +50 °C were carried out by a dilatometric method according to GOST P 57739-2017 with use of the DIL 402 Expedis device of Netzsch GmbH & Co. with a deformation’s frequency 0,5 Hz and amplitude of deformation up to 1%.
The lack of adequacy in the measuring of «green strength» of Rubber Compounds, based on all brands of IR, also on NR was discovered at their production in laboratory tangential mixers Banbury or Haake types in comparison with industrial mixer. This result demands the carrying out additional R&D with the modeling of conditions of industrial manufacturing of the Rubber Compounds for assessment of this feature during the transition to the usage of IR of various brands instead of NR.
On the most of objects under research – based on the IR domestic brands (serial of SKI-3, SKI-5, SKI-5MP and also samples from earlier released trial parties SKI-3S and SKI-5 without anti-agglomerator the calcium stearate suspension), modified with NFA, the possibilities of achievement and excess of the levels of unvulcanized Rubber Compounds properties («green strength», lower viscosity) and properties of their vulcanizates (FMP, hysteresis) in comparison with those of NR based Rubber Compounds were shown. The best nearing of the properties of IR's and NR's Rubber Compounds is reached at an excluding from IR at their releasing in industry the anti-agglomerator, based on suspension of calcium stearate.