通过以高密度聚乙烯(HDPE)、Cl2和磺酰氯(SO2Cl2)作为反应试剂,采用液固本体法制备氯磺化聚乙烯(CSM)。液固法制备出氯含量为30%～38%、硫含量为0.6%～1.3%的CSM,对其各项性能测试发现,液固法CSM的交联密度随硫含量的增大而降低;拉伸强度在此范围内几乎不变,均为26MPa左右;扯断伸长率随硫含量的增大而降低;其氯含量越高,回弹性越差,压缩永久变形越小;玻璃化温度(Tg)随分子链上极性氯原子含量的增加而升高;CSM热分解过程分为3个阶段,分别为氯磺酰基的脱除、氯原子的脱除和降解反应。液固本体法制备的CSM符合GB/T 30920—2014氯磺化聚乙烯(CSM)橡胶的要求。
Chlorosulfonated polyethylene (CSM) was prepared by liquid-solid method with high density polyethylene (HDPE),Chlorine(Cl2) and sulfonyl chloride (SO2Cl2) as reaction reagents.CSM with chlorine content of 30% to 38% and sulfur content of 0.6% to 1.3% was prepared by this method,and FT-IR was used to prove the feasibility of the reaction.The performance tests showed that the crosslinking density of CSM decreased with the increase of sulfur content,and the tensile strength remained about 26MPa,and the elongation at break decreased with the increase of sulfur content.The higher the chlorine content,the worse the resilience and the smaller the compression permanent deformation.Glass transition temperature (Tg) increased with the increase of polar chlorine atoms on the molecular chains.The thermal decomposition process of CSM was divided into three stages.The removal of chlorsulfonyl groups,the removal of chlorine atoms,and the degradation reaction,respectively.The CSM prepared by liquid-solid method met the requirements of GB/T 30920—2014 chlorosulfonated polyethylene (CSM) rubber.
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