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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