摘要
本研究通过对浆粕研磨后的纤维形态进行分析,研究了切断纤维比例、细小纤维含量对醋化反应速率、二醋酸纤维素片(醋片)颗粒数的影响,分析了醋片丙酮溶液中不溶物的组成及高乙酰化值不溶物的变化趋势。结果表明,提高切断纤维比例可加快醋化反应速率,但随着反应程度增加,高乙酰化值不溶物增多;调节研磨后切断纤维比例可优化醋片5~10μm颗粒数,本研究通过数据拟合得出切断纤维比例为56.0%时,5~10μm颗粒数达最小值4013个,对应的细小纤维含量为9.75%,反应速率为0.425℃/min,即研磨机动静磨盘间隙为4 mm,能最大限度减少5~10μm颗粒数,从而改善醋片的可纺性。
In this study,by analyzing the fiber morphology of pulp after grinding,the effects of cut-off fiber ratio and small fiber content on the reaction rate of vinegarization and the particle number of cellulose diacetate flakes(vinegar flakes)were investigated,and the composi‑tion of insoluble substances in acetone solution of vinegar flakes and the trend of insoluble substances with high acetylation value were ana‑lyzed.The results showed that increasing the ratio of cut-off fiber could accelerate the reaction rate of vinegarization.However,with the in‑crease of reaction intensity,the insoluble substances with high acetylation value increased.Adjusting the cut-off fiber ratio could optimize the result of 5μm particle count of vinegar flakes.By data fitting,at the cut-off fiber ratio of 56.0%,the minimum value of 5μm particle counts was 4013,and the small fiber content was 9.75%and the reaction rate was 0.425℃/min.The clearance between the dynamic and static grinding discs was 4 mm,which could minimize 5~10μm particle counts,and improving the spinnability of clellalose diacetate.
作者
刘佳
王杰
邢庆健
周剑秋
陈晓璐
黄玉庆
LIU Jia;WANG Jie;XING Qingjian;ZHOU Jianqiu;CHEN Xiaolu;HUANG Yuqing(Nantong Cellulose Fibers Co.,Ltd.,Nantong,Jiangsu Province,226008;Nanjing Tech University,Nanjing,Jiangsu Province,211816)
出处
《中国造纸》
CAS
北大核心
2023年第3期87-94,共8页
China Pulp & Paper
关键词
纤维形态分析
醋化反应
二醋酸纤维素片
颗粒数
fiber morphology analysis
cellulose acetylation reaction
cellulose diacetate flake
particle count
