Abstract
The influence of dispersing agents on the properties of rubber mixes based on nitrile butadiene rubbers BNKS-18AMN and BNKS-28AMN intended for the production of articles by injection moulding was studied. Four types of dispersing agent were investigated, and the best effect was obtained for two of them: INT 59 and LMWPE. When these are used, there is a considerable reduction in viscosity and an improvement in the processing and mechanical properties. The influence of the content of these dispersing agents was also studied. Comparison of the properties of raw mixes and vulcanisates showed that slightly better results, including the heat resistance of seals, are achieved for INT 159. As the difference is small, and LMWPE is produced in Belarus, LMWPE is recommended as a dispersing agent in the composition of rubbers intended for articles to be manufactured by injection moulding. It was shown that the optimum is to introduce LMWPE into the formulation in a quantity of 2 parts per 100 parts rubber; this corresponds to the best combination of service properties.
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