Nanotechnology and Advanced Biomaterials Group, Avantha Centre for Industrial Research & Development, Paper Mill Campus, Yamuna Nagar, 135001, India.
Avantha Centre for Industrial Research & Development, Paper Mill Campus, Yamuna Nagar, 135001, India.
Carbohydr Polym. 2020 Jun 15;238:116186. doi: 10.1016/j.carbpol.2020.116186. Epub 2020 Mar 19.
Micro-nanofibrillated cellulose was prepared using bleached mixed hardwood pulp by a low energy consuming chemo-refining approach having potential to be implemented easily in paper industry. Bleached mixed hardwood pulp was pretreated with sodium meta-periodate and sodium chlorite and micro-nanofibrillated by using refining in Valley beater. Scanning electron microscopy images of prepared micro-nanofibrillated cellulose showed 87 % fibre distribution in nano range, 4.47 ± 0.5 g/g water retention value and 2.13 ± 0.1 meq/100 g carboxyl content. Carboxylation effect of given chemical pretreatment was further confirmed by FTIR analysis. Paper handsheets, having bleached mixed hardwood pulp and prepared micro-nano-fibrillated cellulose, resulted in about 5% lower bulk with 27 %, 32 % and 87 % higher breaking length, burst factor and double fold, respectively than control (without nano-fibrillated cellulose). Prepared micro-nanofibrillated cellulose addition didn't show negative effect on pulp drainability (33 °SR). This work showed that micro-nanofibrillated cellulose might also be prepared using conventional routes of paper industry to improve paper properties.
采用低能耗的化学 refining 方法，从漂白混合硬木浆中制备出微纳米纤维素，该方法具有易于在造纸工业中实施的潜力。漂白混合硬木浆先用偏亚硫酸钠和亚氯酸钠预处理，然后在 Valley 打浆机中进行微纳米细化。制备的微纳米纤维素的扫描电子显微镜图像显示，87%的纤维分布在纳米范围内，水保留值为 4.47±0.5g/g，羧基含量为 2.13±0.1meq/100g。通过傅里叶变换红外（FTIR）分析进一步证实了给定化学预处理的羧化作用。与对照（不含纳米纤维素）相比，含有漂白混合硬木浆和制备的微纳米纤维素的纸张手抄片的松厚度降低了约 5%，而抗张强度、耐破度和耐折度分别提高了 27%、32%和 87%。制备的微纳米纤维素的添加对纸浆滤水性能（33°SR）没有负面影响。这项工作表明，也可以使用传统的造纸工业路线来制备微纳米纤维素，以改善纸张性能。
