标题：Preparation of microencapsulated alpha-olefin drag reducing polymer used in oil pipeline transportation
作者：Li Bing; Xing Wenguo; Dong Guilin; Chen Xiangjun; Zhou Ningning; Qin Zhanbo; Zhang Changqiao
作者机构：[Li, B] School of Chemistry and Chemical Engineering, Shandong University, Shandong 250061, China;[ Xing, W] School of Chemistry and Chemical Engineer 更多
通讯作者地址：[Zhang, CQ]Shandong Univ, Sch Chem & Chem Engn, Jinan 250061, Shandong, Peoples R China.
关键词：α-olefin polymer;molecular design;coating material;microcapsule preparation;stability and solubility;drag reducing property
摘要：Microcapsules containing oil drag-reducing polymer particles were prepared by meltingscattering and condensing of polyethylene wax,in-situ polymerization of urea and formaldehyde,and interfacial polymerization of styrene respectively.The related processes were studied by a molecular dynamics simulation method,and molecular design of microcapsule isolation agent was carried out on the basis of the simulation.The technologies for preparing microencapsulated oil drag-reducing polymer particles were compared and the circulation drag reducing efficiency of the microencapsulated polymer particles was evaluated based on the characterization results and their dissolution properties.Molecular design of a microcapsule isolation agent suggests that ct-olefin polymer particles can be stably dispersed in water by using long-chain alkyl sodium salt surfactant which can prevent the agglomeration of α-olefin polymer particles.The results of simulation of the adsorption process shows that the amount of alkyl sodium salt surfactant can directly affect the stability of microencapsulated α-olefin polymer particles.and there must be a minimum critical amount of it.After characterization of the morphology by Scanning Electron Microscopy(SEM)and comparison of the static pressure stability,especially the conditions of reaction and technological control of microcapsules with different shell materials,microencapsulation of α-olefin polymer particles with poly-(urea-formaldehyde)as shell material was selected as the optimum scheme,because it can react under mild conditions and its technological process can be controlled in a large range.The relationship of drag reducing rate and dissolving time of microcapsules showed that the formation of microcapsules did not affect the maximum drag reducing rate,and the drag reducing rate of each sample can reach about 35％ along with the dissolving time,i.e.microencapsulation did not affect the drag reducing property of α-olefin polymer.