Dispersing Properties of Long Chain Carboxylic Acid Derivatives for Carbon Black in EPDM
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Effects of two different types of long carbon chain acid derived dispersants for carbon black and EPDM rubber system on the vulcanization process were investigated using Mooney viscometer and moving die rheometer. The Mooney viscosity of amide type dispersant containing rubber system decreased more than that of ester type dispaersant containing one. And, the amide type dispersant shortened a scorch time more than one minute. The vulcanization time measured by rheometer was faster for amide type dispersant systems. Delta torque values of carbon black and EPDM rubber increased with amide type dispersant, but slightly decreased with ester type dispersant. The thermal aging of the EPDM blend at 100 oC for 24 h showed little change in the case of amide type dispersant, but the elongation tends to decrease by 10-20% for all EPDM rubber containing long carbon chain additives.