| High-temperature Stable Insoluble Sulfur IS-HS |
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| DOI： |
| Key Words: insoluble sulfur；polymeric sulfur；stability |
| Author Name | Affiliation | | Pu Qijun | Beijing Research and Design Institute of Rubber Industry |
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| Abstract: |
| The new types of insoluble sulfur IS-HS were int roduced. The preperation of insoluble sulfur and the physico-chemical causes of its reversion to soluble sulfur were discussed based on the sulfur chemistry and the polymerization mechanism of rhombic sulfur. The stablity of new IS-HS products which had been treated with high-temperature stabilizer PEF reached over 90%（final IS content based on element S）after exposure at 105℃ for 25 min. In contrast，the stability of convensional insoluble sulfur was only about 57%. The effect of basic compounds on the stability was investigated. The results showed that the order of amines affecting the reversion was as follows：diphenylguanidine accelerators（DPG）＞sulfenamides（CZ，DZ，OTOS，NOBS）＞thiurams（TMTD）＞thiazoles（M，MBTS），keto-amine antioxidants（RD）＞terephthalic diamines（4010NA）＞naphthylamines（A）；the common dried bi，tri or tetravalent metal oxides didn′t show significant effect on the stability. A method for predicting bloom possibility of IS-containing compound in the formula design was proposed. |
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