NaOH/硫脲的温和处理对木浆纤维及纸张性能的影响

Effect of Mild Treatment with NaOH/Thiourea on the Morphology and Properties of Wood Pulp Fibers

关键词:  NaOH/硫脲  纤维素纤维  表面形态  粗糙度

Key Words:NaOH/thiourea  cellulose fiber  surface morphology  roughness

摘要:为获得高松厚度、高透气度的纸基材料纤维，本研究采用NaOH/硫脲对硫酸盐针叶木浆纤维进行低温温和处理，分析了低温（－15℃）处理（冷冻）时间和硫脲用量对纤维性能及纸张的影响。结果表明，随着冷冻时间的延长，纤维长度缓慢下降，细小纤维含量减少，纤维润胀，弯曲扭结；当NaOH/硫脲水溶液用量为8%NaOH/8%硫脲、冷冻时间为20 min时，与对照组纤维相比，二重质均纤维长度缩短了14.51%，细小纤维含量降低了60.62%；X射线衍射（XRD）分析显示，处理后的纤维结晶度降低了2.13%；扫描电子显微镜（SEM）和原子力显微镜（AFM）分析表明，处理后的纤维表面呈现出明显褶皱，纤维平均粗糙度增加了159%。同时，纸张纤维平均孔径从28.79 μm增加到49.62 μm，纸张松厚度增加了39.53%，透气度增加了105.38%。

Abstract:In this study， NaOH/thiourea was used to treat wood pulp fibers at low temperature to obtain the fibers using for paper-based material with high bulk and high air permeability， the effects of treatment time at low temperature （-15℃） and thiourea dosage on fiber morphology and physical properties were studied.The results showed that with treatment time increasing the fiber length decreased slowly， the content of fiber fine decreased， the fiber swelled， curled and kinked.When the amounts of both NaOH and thiourea were 8% and the treatment time was 20 min， the fiber length was shortened by 14.51%， and the fiber fine content was reduced by 60.62% compared with the untreated fiber. X-ray diffraction （XRD） analysis showed that the treated fiber crystallinity reduced by 2.13%, scanning electron microscopy （SEM） and atomic force microscopy （AFM） analysis showed that the treated fiber surface showed significant wrinkles and the fiber roughness increased by 159%.At the same time， the average pore size increased from 28.79 μm to 49.62 μm, the bulk and the air permeability of the resultant paper increased by 39.53% and 105.38% respectively.