辊压法烟草薄片增强用醚化改性木质纤维的研究

Carboxymethylated Wood Fibers for Rolled Reconstituted Tobacco Sheet as a Reinforcing Phase

关键词:  加热不燃烧卷烟  辊压法烟草薄片  醚化改性纤维  抗张强度

Key Words:heat-not-burn tobacco  rolled reconstituted tobacco  carboxymethylated modified fiber  tensile strength

摘要:本研究首先通过设计正交实验研究了醚化工艺参数对木质纤维羧基含量的影响；其次探究了羧基含量对纤维形貌、结晶结构、保水值及其在烟草薄片中分散性的影响；最后比较了不同羧基含量的纤维对辊压法烟草薄片的增强效果。结果表明，在实验室条件下，3个工艺参数对纤维羧基含量影响顺序为：反应药品浓度>浆浓>反应时间。羧基含量与反应药品浓度成正比，与浆浓成反比，较佳的反应时间为50 min。随着羧基含量的上升，纤维平均宽度逐渐增加，纤维质均长度先增加后减少，而细小纤维含量先降后升。此外，羧基含量的上升提高了纤维的保水值及其在烟草薄片中的分散均匀性。相比于外加原纤维的样品，当羧基含量≥0.65 mmol/g时，醚化改性纤维能显著提高辊压法烟草薄片的抗张强度，提升幅度为35.8%~106.6%。

Abstract:The influence of etherification process parameters on fiber carboxyl content was studied by designing orthogonal experiments， and the effects of carboxyl group content on fiber morphology， crystalline structure， water retention capacity of wood fibers and its dispersibility in reconstituted tobacco were explored in this study. Finally， a comparison in reinforcement effect of original fibers and carboxymethylated fibers with different carboxyl group contents was carried out. The results showed that the order of these process factors affecting the fiber carboxyl group content was as follows： reagent dosage>fiber concentration>reaction time. The content of carboxyl group was proportional to reagent dosage and inversely proportional to fiber concentration with an optimum reaction time of 50 min. With the increase of carboxyl group content， the average width of carboxymethylated wood fibers increased， the length-weighted mean length increased first and then decreased， while the fine content decreased first and then increased. Besides， carboxymethylated wood fibers with higher carboxyl content groups showed a higher water retention value and could improve their dispersion uniformity in reconstituted tobacco sheet. Compared with sample of original wood fibers， rolled reconstituted tobacco sheet with carboxymethylated fibers （carboxyl group content≥0.65 mmol/g） indicated a 35.8%~106.6% increase in tensile strength.