|Improved Processing Stabilizer Systems for Rubber Compounding
Dr.Gerrit Knobloch Chris Fagouri Dr. Mouhcine Kanouni Ciba Specialty Chemicals Inc Basel, Switzerland
Nippon Gomu Kyokaishi,(2006),79(6),312-315 General Review in Japanese
The rubber industry is frequently confronted with processing problems resulting in bad distribution of components, low quality or even unemployable rubber compounds.
Reasons can be oxidative damage of the rubber because of extended storage or insufficient rubber stabilization, as well as oxidative cross-linking during mixing due to severe processing conditions. Standard rubber antidegradants such as TMQ and PPDs have a limited contribution to processing stability.
Specially optimized rubber processing stabilizers can reduce the problems caused by oxidative reactions during compounding. With these specially formulated antidegradant systems, it is possible to make black, natural or coloured compounds with a reduced tendency of gel formation in a broader temperature range.
Additionally, these fully formulated antidegradant systems can be employed in silica filled rubber compounds, e.g., tire treads, while, again broadening the processing window, reducing premature cross-linking, and reducing compound viscosity and hence compound temperature during mixing. This article will cover new technology for improved processing and storage stability of rubber compounds, and offer information on recent advances in products that will allow for reduced scorching and higher temperature processing.
Antidegradant, Processing Stabilizer, Silica Filled Rubber, Tire Tread, Scorching