The effect of a coating material on antiozonant blooming in natural rubbercompounds

The objective of this study was to find out the effect of a selected coatin g material (liquid nitrile butadiene rubber) on antiozonant diffusion in a natural rubber substrate. The antiozonant used was N-isopropyl-N'-phenyl-p- phenylenedi- amine (IPPD). The study demonstrates a comparison of compatibi lity between IPPD in natural rubber and IPPD in nitrile butadiene rubber. D ue to the polarity of nitrile butadiene rubber and the non-polar nature of natural rubber, initial results from the study showed that diffusion of IPP D in natural rubber is easier than diffusion of the same in nitrile butadie ne rubber. In both cases however, the amount of accumulated bloom on the su bstrate surface was a measure of compatibility between the elastomers and t he antiozonant.