用枣椰树叶轴微细纤维素和氧化微细纤维素来改善纸张性能

Palm rachis micro-fibrillated cellulose and oxidized micro-fibrillated cellulose for improving paper sheets properties of unbeaten softwood and bagasse pulps

通过木聚糖酶预处理以及轻微磨浆处理,漂白枣椰树叶轴浆用来分离制备微细纤维素(MFC)和四甲基哌啶氧化微细纤维素(TMFC)。分离后的MFC和TMFC用来改善未打浆针叶木浆和甘蔗渣浆抄造的纸张的强度性能,添加比例从2.5%增加到20%,并且对MFC的留着也进行了估测。结果显示,MFC和TMFC的添加能够提高未打浆针叶木浆和甘蔗渣浆抄造的纸张的紧度、干湿抗张强度、撕裂强度以及降低纸张的透气度。但是,在改善针叶木浆纸张强度性能方面,通常的打浆操作比添加微细纤维素更加有效。另一方面,在改善甘蔗渣浆纸张强度性能方面,添加MFC和TMFC比通常的打浆操作更加有效。并且,在针叶木浆中或者甘蔗渣浆中添加TMFC对抗张强度(干强度和湿强度)的改善比添加MFC效果更好。

Bleached palm rachis pulp pretreated with xylanase enzymes was used for isolation of micro-fibrillated cellulose （MFC） and TEMPO-oxidized MFC （TMFC） by ultrafine grinding. The isolated MFC and TMFC were used at ratios from 2.5% to 20% for improving strength properties of paper sheets prepared from unbeaten softwood and bagasse pulps. The retention of micro-fibrillated cellulose in paper sheets was also estimated. The results showed that MFC or TMFC brought about an increase in density, wet and dry tensile strength, tear resistance, and a decrease in air permeability of paper sheets prepared from unbeaten softwood or bagasse. However, usual beating of softwood fibers was much more effective in improving strength properties of softwood paper sheets than addition of micro-fibrillated cellulose. On the other hand, the improvement in strength properties of bagasse paper sheets as a result of MFC or TMFC addition was generally higher than that resulted from beating of bagasse pulp. Use of TMFC with unbeaten softwood or bagasse fibers resulted generally in better improvement in tensile strength （wet and dry） than in case of using MFC.