改性纳米纤维素对烟草浆料滤水和留着性能的影响

Effect of Different Characteristics of Nanofibrillated Cellulose on Retention and Drainage of Tobacco Slurry

关键词:  纳米纤维素  烟草浆料  留着率  滤水  抗张指数

Key Words:nanofibrillated cellulose  tobacco slurry  retention  drainage  tensile index

摘要:通过动态滤水测试仪和浊度测试仪对不同长度和电荷量的阳离子化改性纳米纤维素（CNFC）进行分析比较。结果表明，相同电荷密度CNFC的长度对浆料的留着影响不大，而对浆料的滤水有明显的作用；CNFC所带正电荷密度越大，对浆料的留着和滤水性能越好。以CNFC-3（电荷量+0.980 mmol/g）为例，增加CNFC-3的用量，能够提高其对烟草浆料和填料的留着以及浆料的滤水性能。在其用量为0.4%时，浆料和填料的留着率分别达到81.9%和33.5%，比未加纳米纤维素时提高5.7个百分点和25.5个百分点，30 s内滤液的质量增加了85 g。同时滤液的阳离子需求量由110μmol/L下降到65μmol/L，浊度下降532 NTU。

Abstract:The retention and filtration performance of tobacco slurry adding cationized modified nanofibrillated cellulose（CNFC） with different size and charge were determined using Dynamic Drainage tester and turbidity tester.It was found that at the same charge density the length of CNFC had little influence on the retention of the slurry， while the filtration time was reduced. And the charge of nanofibers had positive effect on the retention and filtration of tobacco slurry， the retention and drainage of the slurry increased with increasing charge of CNFC.Taking CNFC-3（charge density +0.980 mmol/g） as an example， the retention and drainage performances of slurry increased with increasing CNFC-3 addition.The retention values of slurry and filler increased to 81.9% and 33.5% respectively， improved by 5.7 percentage points and 25.5 percentage points comparing with the slurry without addition CNFC-3， the mass of the filtrate increased by 85 g within 30 s when the dosage of CNFC-3 was 0-4%.And the cation demand of the filtrate dropped to 65 μmol/L from 110 μmol/L， and turbidity decreased by 532 NTU．