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Sulfur curing of nr using TOTD/CBS combination system.

Shigemitsu OTOMO, Yukio Kobayashi, Yoshitomo Yamamoto

Abstract

The activity of tetrakis (2-ethylhexyl) thiuramdisulfide (TOTD) as a curing accelerator was evaluated. When used with CBS for sulfur curing of NR, TOTD exhibited superior curing characteristics such as good scorch safety and faster curing rate compared to other thiuramdisulfides including TMTD, TETD and TBTD. This effect of TOTD/CBS combination on curing characteristics was attributed to the moderate reactivity of TOTD for CBS during vulcanization from DTA data of the mixtures of CBS and thiuramdisulfides. NR vulcanizate obtained with TOTD/CBS combination showed the excellent heat ageing resistance compared to those cured with CBS and other thiuramdisulfides. This effect of TOTD/CBS combination on the heat ageing resistance was attributed to the increase of stable sulfur crosslink contents including mono-and disulfidic linkages from analyses of sulfidic crosslinks.

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Key concepts: Curing (chemistry), Vulcanization, Sulfur, Materials science, Chemistry, Natural rubber, Heat resistance, Polymer chemistry