Synthesis Of Insolble Suifur, Modifiedand Its Impact On The Performance Of The Rubber

The preparation of insoluble sulfur with low melt polymerization, and therelationship between the insoluble sulfur and the extraction agent were studied in thisarticle. It was found that benzene/naphthalene system, toluene/n-butanol system,carbon tetrachloride, and tetrachlorethylene are all available to be used as theextraction agent during the preparation of the insoluble sulfur. Moreover,benzene/naphthalene and toluene/n-butanol systems perform better and they canreplace the carbon disulfide. Besides, the relationships between the content, thestability under high temperature of the insoluble sulfur and the differentpolymerization temperature, various content of the stabilizers, different holding timewere also studied in the formular which has the antioxidant264, calcium stearate,264antioxidant and calcium stearate complexes as a stabilizer. It was found that theantioxidant264performed best if the reaction temperature was setted at220℃, themass ratio of active materials and sulfur was setted at1:1000, and a30min holdingtime; while the relatively data was240℃,1:1000,30min for calcium stearate, and240℃,1:1000,30min for stabilizer, respectively. The accuracy of the results is alsoconfirmed through the DSC, XRD, SEM and other technological tools.During the modification process, it was found that chlorinated polystyrene showed abetter performance than that of the styrene, ABS resin, and chloridepolystyrene if theyplayed a role as macroinitiator when the mass ratio of the macroinitiator and sulfur was1:120, the reaction temperature was240℃and the holding time was30min. Theprepared sample performed better than the ntioxidant264and calcium stearate with acontent of54%for the insoluble sulfur. The scorch time would be extended effectively, the compression heat would be decreased significantly, and the crossing density wouldbe increased considerably if this prepared sulfur was employed as the crossing agent inthe SSBR. Moreover, after a long time, there is no obvious blooming phenomenoncould be found in this product.