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首页> 外文期刊>Cellulose >Isolation of lignocellulose nanofiber from recycled old corrugated container and its interaction with cationic starch-nanosilica combination to make paperboard
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Isolation of lignocellulose nanofiber from recycled old corrugated container and its interaction with cationic starch-nanosilica combination to make paperboard

机译：从再生旧波纹容器中的木质纤维素纳米纤维分离及其与阳离子淀粉 - 纳米硅藻组合制作纸板的相互作用

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In recent years, many studies have been carried out on the use of cellulose nanofiber (CNF) produced from virgin fiber as a strengthening agent for improving the physical and mechanical properties of paper, while the use of CNF isolated from bleached virgin fiber is not necessary or reasonable for many recycled/impure products. In this due, novel lignocellulose nanofiber (LCNF) was produced from inexpensive recycled old corrugated container pulp by the ultra-fine grinding technique. The diameter of the resulted LCNF was in the range of 10-80nm, while the cellulose crystallinity index and crystallite size reduced during the process to 49% and 4nm, respectively. Regarding the chemical composition of LCNF, no significant change was observed in comparison to OCC fiber. But, an obstacle for the application of nanofibers, especially for paperboards, is dewatering problem. Accordingly, it was tried to evaluate the potential of cationic starch-anionic nanosilica combination as a drainage/retention aid to compensate for the negative effects of applying nanofibers in the pulp suspension, meanwhile the combination enhances the gains of LCNF application. The evaluation of pulp freeness showed that the addition of 3% nanofibers reduced dewatering ability about 100ml CSF (around 33% loss). But, interaction of the nanosilica-starch system with the furnish containing LCNF not only compensated for the freeness reduction, but also caused a 32% or 57% increase in tensile index, in comparison to sample containing LCNF or control pulp respectively. Moreover, the addition of starch-nanosilica system with LCNF to pulp suspension, improved the retention of fine materials. Also, LCNF caused a reduction in thickness, bulk and bending resistance index of paperboard, while employment of the starch-nanosilica combination somehow off-set these negative effects. In addition, as a result of the cationic starch-anionic nanosilica system, the tear index was improved.
机译：近年来，已经开始使用由原始纤维产生的纤维素纳米纤维（CNF）作为强化剂来进行许多研究，以改善纸张的物理和力学性能，而不需要使用CNF的CNF或合理的许多再循环/不纯产品。在此期间，通过超细研磨技术从廉价的再生旧波纹容器纸浆生产新型木质纤维素纳米纤维（LCNF）。所得LCNF的直径在10-80nm的范围内，而纤维素结晶度指数和微晶尺寸分别在该过程中减少至49％和4nm。关于LCNF的化学成分，与OCC纤维相比，没有观察到显着变化。但是，用于应用纳米纤维的障碍，特别是纸板是脱水问题。因此，试图评估阳离子淀粉 - 阴离子纳米碱基组合的潜力作为排水/保持助剂，以补偿纸浆悬浮液中施加纳米纤维的负面影响，同时组合增强了LCNF应用的增益。对纸浆Freeness的评价表明，添加3％纳米纤维的加入能力降低约100mL CSF（约33％的损耗）。但是，纳米淀粉系统与含有LCNF的配料的相互作用不仅补偿了含有LCNF或对照纸浆的样品的拉伸指数的增加32％或57％。此外，用LCNF加入淀粉 - 纳米硅系统至纸浆悬浮液，改善了细材料的保留。此外，LCNF引起纸板的厚度，体积和弯曲性指数的降低，同时以淀粉 - 纳米硅的组合的就业以某种方式缩小这些负效应。另外，由于阳离子淀粉 - 阴离子纳米硅藻系统，改善了撕裂指数。

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