碘仿调节型氯丁橡胶的合成及性能

Synthesis and properties of iodoform-regulated chloroprene rubber

用碘仿取代二硫化二异丙基黄原酸酯作相对分子质量调节剂,按照国内传统黏接型氯丁橡胶(CR)-244大生产配方及反应条件制备了CR,并考察了其综合性能以及碘仿用量对CR分子量分布的影响。结果表明,用碘仿作相对分子质量调节剂,可制备出门尼黏度、剥离强度、溶液旋转黏度等综合性能与CR-244橡胶一致、且重现性好的黏接型CR;氯丁二烯乳液聚合具有一定的活性自由基聚合特征,且随着碘仿用量的增大,CR的分子量分布有变窄的趋势。

The chloroprene rubber（CR） was synthesized according to the domestic traditional formula in large-scale industrial production and reaction conditions of adhesive type CR-244, with iodoform as a relative molecular mass regulator to replace the traditional dithiodiisopropyl xanthate, and the all-round properties of the CR and the effect of iodoform amount on the molecular mass distributions of CR were investigated. The results showed that with iodoform as the relative molecular mass regulator, the adhesive type CR could be prepared, which Mooney viscosity, peeling strength, solution rotary viscosity, and other performance indexes all identical to those of CR-244 and had good reproducibility. The emulsion polymerization of chloroprene was found to have the characteristics of living radical polymerization and the molecular mass distributions got narrower with the increase of iodoform amount.