UNIPOL气相聚乙烯反应器块料生成热历史研究  

Investigation of the thermal history of agglomeration in UNIPOL PE reactor

作　　者：于佩潜 Yu Pei qian(National Institute of Clean-and-Low-Carbon Energy,CHN,Beijing,102209,China)

机构地区：[1]国家能源集团北京低碳清洁能源研究院,北京102209

出　　处：《化学研究与应用》2022年第3期597-603,共7页Chemical Research and Application

基　　金：国家能源集团公司项目(KJ9300000218)资助。

摘　　要：本文采用热分析(DSC)的方法对UNIPOL气相流化床聚乙烯反应器块料生成过程所经历的热历史进行了详细测试与对比分析。结果发现,在反应器排产线性低密度聚乙烯LLDPE DFDA-7042时,DSC曲线上出现了多重熔融峰,其一次升温熔融峰值和熔融焓值均高于对应粉料的,表明块料经历了更为复杂的熔融再结晶过程,结晶更为完善;而在排产高密度聚乙烯HDPE DMDA-8007时,DSC曲线上只有一个完整的熔融峰,其一次升温熔融峰值和熔融焓值与对应粉料的基本相同,表明块料未经历复杂的熔融再结晶热历史过程。不同牌号块料经历的热历史不同,反映了其结块机理的不同。使用不同催化剂生产DFDA-7042时产生的块料均经历了复杂的熔融再结晶过程。通过对块料形成过程热历史的追溯,加深了对块料形成机理的认识。The thermal history of different types of agglomeration in UNIPOL PE was studied using Differential Scanning Calorimetry(DSC).It was found that the DSC curve of the agglomeration mass of a linear low density PE(LLDPE;DFDA-7042 grade)exhibited multiple melting peaks with the highest melting temperature and crystallinity both being higher than those of its granular product.These results suggest that the agglomeration of the DFDA-7042 grade possibly underwent a complex melt recrystallization process.In contrast,the DSC of the HDPE DMDA-8007 grade showed only one melting peak with its melting temperature close to its granular product.It appears that DSC can be used as a powerful tool for studying thermal history and understanding the mechanism of polymer agglomeration.

关 键 词：聚乙烯 流化床 聚合反应器 结块 热历史 

分 类 号：O632.12[理学—高分子化学]