原纤化过程对纸基空气滤材结构和性能的影响

Study on the Structure and Properties of Cellulose-based Air Filter Material Controlled by Fibrillation

关键词:  植物纤维  原纤化处理  冷冻干燥  空气滤材  Z向形貌

Key Words:plant fiber  fibrillation treatment  freeze-drying  air filter material  Z orientation morphology

摘要:以木浆为原料,分别采用不同磨浆转数对木浆纤维进行原纤化处理,使其表面分丝帚化,再利用冷冻干燥技术保持纤维表面分丝状态而避免角质化,从而制备出可生物降解的纸基空气过滤材料。研究了不同程度原纤化处理对纸基空气滤材结构和性能的影响,探讨了原纤化处理对滤材Z向形貌的影响机理。结果表明，浆料浓度为1.5%、冷冻温度为-56℃、磨浆转数为50000 r时,纸基空气滤材具有较佳的过滤性能。

Abstract:In this research， a novel method for preparing biodegradable cellulose-based air filter materials based on freeze-drying technique to remain fibrillation of the fiber surface and avoid hornification was presented. The plant fibers were chosen as the raw materials and treated by using grinding in different revolutions. The effect of various degree of fibrillation treatment on the structure and properties of cellulose-based air filter materials was investigated. Besides， the influence mechanism of fibrillation treatment on Z direction morphology of filters was also researched.The results demonstrated that the air filter materials behaved the superior filtering performance under the treatment condition of 50000 r grinding revolution、-56℃freezing temperature and 1.5%pulp concentration. Furthermore， the fibrillation treatment made more microfibrils remained on the surface of fibers and free hydroxyl groups exposed， which enhanced the interleaving force of fibers and uniformed the pore distribution among materials. In addition，three-dimensional spider-web like structure consisted of microfibrils and fiber back bones could improve interception capacity of air filters for particulate particles. Therefore， the environment-friendly cellulose-based air filter material was fabricated efficiently and controllably．