Unipol气相反应器中线性低密度聚乙烯粉料与块料的结构对比  

Structure analysis of linear low density polyethylene powder and agglomeration in Unipol gas phase reactor

作　　者：杜文博 刘振宇 蒋文军[1] 林华国 殷杰 DU Wen-bo;LIU Zhen-yu;JIANG Wen-jun;LIN Hua-guo;YIN Jie(Research Institute,Maoming Branch Company,SINOPEC,Maoming 525011,China;Department of Chemical Industry,Maoming Branch Company,SINOPEC,Maoming 525011,China)

机构地区：[1]中国石化茂名分公司研究院,广东茂名525011 [2]中国石化茂名分公司化工分部,广东茂名525011

出　　处：《石化技术与应用》2024年第4期256-258,共3页Petrochemical Technology & Application

摘　　要：对Unipol气相聚合工艺生产的2种牌号线性低密度聚乙烯(LLDPE)2720和7042的粉料及其块料的微观结构进行了表征,并对结块机理进行了分析。结果表明:2种牌号LLDPE的粉料与块料相比,熔点和结晶度都有不同程度的下降;结晶温度、相对分子质量以及熔体流动速率基本一致;2种牌号LLDPE粉料均具有较强的颗粒感观,而块料是细小颗粒熔融黏成块的结果,块料内部有气泡结构。块料形成主要是由扩散段的颗粒静电吸附和丁烯插入降低聚乙烯熔融温度的双重作用导致的。The microstructure of powder material and its agglomeration material of two types of linear low density polyethylene(LLDPE)2720 and 7042 produced by Unipol gas phase polymerization process were characterized and the agglomeration mechanism was analyzed.The results showed that the melting point and degree of crystallinity of agglomeration polyethylene decreased,the crystallization temperature,relative molecular weight and melting flow rate were basically the same.The two kinds of LLDPE powder had a strong sense of particles,and agglomeration polyethylene resulted from the fine particles melting and bonding into a block,which contained the bubble structure of gas wrapped in the polymer melt.The agglomeration formation was mainly due to the dual action of particle electrostatic adsorption of the diffusion segment and butene insertion to reduce the melting temperature of polyethylene.

关 键 词：线性低密度聚乙烯 气相聚合 粉料 块料 结晶 相对分子质量 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]