摘要
低密度聚乙烯(PE-LD)超细纤维膜制品具有耐腐蚀、疏水、柔韧抗冲击等特点,在医疗、防护、建材等领域有着广泛的应用前景。本文通过自制的超临界二氧化碳(SC-CO_(2))浸润装置,研究了SC-CO_(2)增塑熔喷的主要工艺参数热风温度、热风流量、计量泵转速对PE-LD纤维膜纤维形貌、结晶性能的影响,对影响机理进行了分析,并考察了其过滤与拉伸性能。结果表明,SC-CO_(2)浸渍,提高热风温度、热风流量,降低计量泵转速都有利于降低PE-LD纤维直径,其平均直径最小可达3.88μm;SC-CO_(2)处理、热风温度增加均有利于结晶度的提高;制备的样品热压后滤效达72.9%,滤阻仅51.4 Pa;最大拉伸强度为4.5 MPa,断裂伸长率最大可达30%。本研究提出了PE-LD纤维膜的制备新工艺,相关研究成果有望为聚乙烯纤维膜制备工艺的发展提供参考。
Low-density polyethylene(PE-LD)microfiber membranes are promising materials for medical,protective,and construction applications due to their corrosion resistance,hydrophobicity,and flexibility.However,conventional manufacturing processes face limitations.This study introduces a novel method for producing PE-LD membranes using supercritical carbon dioxide(SC-CO_(2))as a plasticizing agent in a melt-blowing process.We systematically investigated the effects of key process parameters,including SC-CO_(2)impregnation,hot air temperature,hot air flow rate,and metering pump speed,on the fiber morphology,crystallization behavior,and resulting properties.The results indicated that SC-CO_(2)treatment,elevated hot air temperature,increased air flow,and reduced pump speed all contributed to a significant reduction in fiber diameter,achieving an average of 3.88μm.Furthermore,SC-CO_(2)and higher temperatures enhanced crystallinity.The optimized membrane exhibited excellent performance after hot-pressing:a filtration efficiency of 72.9%with a remarkably low-pressure drop of 51.4 Pa,tensile strength of 4.5 MPa,and elongation at break of 30%.This work establishes the SC-CO_(2)-assisted melt-blowing process as a highly effective and novel strategy for manufacturing high-performance PE-LD microfiber membranes with tunable properties.
作者
侯钦正
刘文龙
李长金
秦柳
丁玉梅
李好义
杨卫民
霍正元
HOU Qinzheng;LIU Wenlong;LI Changjin;QIN Liu;DING Yumei;LI Haoyi;YANG Weimin;HOU Zhengyuan(Beijing Laboratory of Biomedical Materials,College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Beijing Research Institute of Chemical Industry,SINOPEC,Beijing 100029,China;Ningbo Green Mobil New Material Technology Co,LTD,Cixi 315300,Zhejiang,China;China International Engineering Consulting Company Limited,Beijing 100032,China)
出处
《中国塑料》
北大核心
2025年第10期18-24,共7页
China Plastics
基金
国家自然科学基金(U22B6012)
中石化总部项目(223087)。
关键词
超临界二氧化碳
熔喷
低密度聚乙烯
纤维膜
过滤性能
力学性能
supercritical carbon dioxide
melt-blown
low density polyethylene
fibrous membrane
filtering performance
mechanical property
