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Organokaolin, through the incorporation of cationic hexadecyltrimethyl  ammonium bromide in various concentrations (50%, 100% and 200% cation  exchange capacity, CEC) into kaolin clay’s interlayer spaces have been  prepared. This was characterized using XRD and FTIR to get information on  sample structural composition and characteristic bonds on modification. These  clays were further used as filler in natural rubber compounds with a  semi-ultra; delayed action accelerator scheme. The X-ray diffraction analysis  showed marginal increase in basal (d(001)) spacing of kaolin platelets from  4.01 to 4.90 nm. Changes in the clay’s molecular environment induced by  ion-exchange process were followed by FTIR measurements revealing various  CTAB+ influenced absorption peaks as modification progressed. Cure  characteristics, scorch (ts2) and cure (t90) time of the organokaolin filled  natural rubber composites was observed better than that of the 40 phr bulk  kaolin across the CEC organophilization concentrations and filler loadings  studied. Vulcanizate properties showed considerable increase in M100, M200,  M300, TS, and elongation at break (%) indicating its potential as an  organomodified filler. Hardness (IRHD) and abrasion resistance showed similar  trend as tensile properties, with the incorporation of organoclay.

Organomodified kaolin as filler for natural rubber