The effect of DPG on silane chemistry of silica in rubber processing
Satoshi Mihara, Elastomer Technology & Engineering, University Twente & Yokohama Rubber Co.
From the environmental point of view, silica is one of the most important fillers in tire rubber compounding. In silica-filled rubber compounds, large polarity differences between the filler and the polymers are present. Therefore, the silica-silica interaction which has a negative effect on the physical properties of silica-filled rubber, takes place. A silane coupling agent is generally used in silica-filled rubber in order to reduce the polarity difference between filler and polymer. However, the chemistry of silane coupling during rubber processing is complicated. 1,3-diphenylguanidine (DPG), used as a secondary accelerator, has an important function in silica-filled tire rubber. In the present study, the focus is on the effect of DPG on the silane chemistry during processing.