Executive summary
Productivity in mixing NR compounds is governed by the time required to mix and disperse carbon black homogeneously and completely into NR. Compound of NR are, in practice, mixed until a desired viscosity has been achieved. Yet the viscosity of the final compound will be determined by several major factors. These include the extent of carbon black dispersion, breakdown in molecular weight of the NR through shear or oxidative degradation ( use of peptizer), and the level of use of softening diluents such as fatty acid soaps and/or oils (when included in the compound). Q- Flex QDI is a multifunctional antidegradant which has been shown to improve mixing productivity by capturing free radials formed during mixing and by preventing oxidative degradation chemistry during the mixing process. This paper will compare the productivity-performance characteristics of Q-Flex QDI ti several major methods used in the processing of NR compounds.
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