采用PFI研磨法将针叶木纤维研磨12万转进行原纤化处理，并通过80目的尼龙滤网收集，制备出直径1~3 μm的原纤化超细木纤维，记为PFI12w-80，将其与3 μm玻璃纤维以不同比例配比作为复合滤材的过滤层，以针叶木纤维为基层，共制备了8种不同配比的复合过滤材料。选取代表性过滤材料分别进行了外观形貌、显微结构、断面以及过滤性能分析，结果表明，原纤木纤维含量越高，滤材强度越高，基材和复合过滤层的结合越紧密，过滤精度也越高，但滤材孔隙率减小，压差特性降低。当原纤化超细木纤维含量占比为10％时，对3, 5 μm颗粒的过滤效率分别达93％，97％，这为高精度过滤材料的研制提供了一种新方法。
Abstract
PFI grinding method was used to fibrillate the softwood fibers to prepare fibrillated ultrafine wood fibers, which were mixed with 3 μm glass fibers in different proportions as the filter layer of the composite filter material. With softwood fibers as the base layer, a total of 8 different types of composite filter materials were prepared. Representative filter materials were selected for appearance, microstructure, cross section and filter performance analysis, the reults show that if the content of fibrized wood fiber is higher, the strength of the filter material is higher, the combination of substrate and composite filter layer is closer, and the filtration accuracy is higher, but the porosity and pressure difference of the filter decreased. When the fiber content of fibrized ultrafine wood is 10%, the filtration efficiency of 3 μm and 5 μm particles reaches 93% and 97% respectively, which provides a new method for the development of high-precision filter materials.
关键词
PFI磨；原纤化针叶木纤维；复合滤材
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Key words
PFI mill, fibrillation coniferous wood fiber, composite filter material
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基金
国家自然科学基金（51375481）；中央高校基本科研业务费（2014-YJ01）
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