乙酸对撑篙竹乙醇法制浆及浆料性能的影响  

Effect of Acetic Acid on Ethanol Pulping and Pulp Properties of Bambusa pervariabilis

作　　者：白红爽 平清伟[1] 盛雪茹 张健[1] 李娜[1] 石海强[1] BAI Hongshuang;PING Qingwei;SHENG Xueru;ZHANG Jian;LI Na;SHI Haiqiang(Dalian Polytechnic University,Key Laboratory of Pulp and Paper in Liaoning Province,Dalian 116034,China)

机构地区：[1]大连工业大学,辽宁省制浆造纸重点实验室,辽宁大连116034

出　　处：《林产化学与工业》2023年第2期43-48,共6页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(31270634);兴辽英才计划特聘教授项目(XLYC1802025)。

摘　　要：以撑篙竹为原料,探讨了乙醇法制浆过程中添加乙酸对浆料得率、硬度、纤维素结晶度、纤维形态及成纸性能等指标的影响。研究结果表明:添加2.0%的乙酸后,蒸煮液pH值由7.3下降至4.1,可显著降低蒸煮液的pH值;浆料的粗浆得率由46.64%下降至43.14%,加速了碳水化合物的降解;浆料卡伯值由52.31下降至48.90,促进了蒸煮过程中木质素的脱除;乙酸用量≤6%时,木质素的相对分子质量有所增加,乙酸用量>6%时,木质素的相对分子质量有所降低。添加乙酸可使木质素的降解或缩合并存,同时使纤维收缩并变得硬挺,浆料纤维的二重重均长度(L_(w))由1.72 mm下降至1.58 mm,二重重均宽度(W_(w))由25.27μm下降至19.37μm;成纸的松厚度、撕裂指数有所提升,松厚度由2.16 cm^(3)/g上升至2.30 cm^(3)/g,撕裂指数由130.67(mN·m^(2))/g上升至133.33(mN·m^(2))/g;而抗张指数、耐折度和耐破指数有较大幅度降低,抗张指数由19.06(N·m)/g下降至14.37(N·m)/g,耐折度由6次下降至3次,耐破指数由1.0(kPa·m^(2))/g下降至0.7(kPa·m^(2))/g;纤维素结晶度由54.67%下降至48.71%,乙酸会破坏纤维素结晶区,且随乙酸用量的增加,纤维素结晶度逐渐降低,但天然纤维素的晶型不会改变。Using Bambusa pervariabilis as the raw materials the effects of acetic acid on the pulp yield,hardness,fiber crystallinity,fiber morphology and paper performance in ethanol pulping were studied.The results showed that the pH value of the solution decreased significantly from 7.3 to 4.1 after 2.0%acetic acid was added.The yield of coarse pulp decreased from 46.64%to 43.14%,which accelerated the degradation of carbohydrates.The Kappa number of pulp decreased from 52.31 to 48.90,which promoted the lignin removal during cooking.The relative molecular weight of lignin increased when the dosage of acetic acid was lower than 6%,while the relative molecular weight of lignin reduced when the dosage of acetic acid was higher than 6%.The addition of acetic acid made the coexistence of lignin degradation or condensation.The average length of the double mass(L_(w))decreased from 1.72 to 1.58 mm,and the average width of the double mass(W_(w))decreased from^(2)5.27 to 19.37μm,which could make the fiber shrink and hard.The loose thickness and tear index of the finished paper were improved after adding acetic acid.The loose thickness increased from^(2).16 to 2.30 cm^(3)/g,and the tear index increased from 130.67 to 133.33(mN·m^(2))/g.The tensile index,flexability and break resistance decreased significantly.The tensile index decreased from 19.06 to 14.37(N·m)/g,the flexability decreased from 6 times to 3 times,and the break index decreased from 1.0 to 0.7(kPa·m^(2))/g.The fiber crystallinity decreased from 54.67%to 48.71%.Acetic acid would destroy the fiber crystal zone,and the fiber crystallinity gradually decreased with the increase of acetic acid dosage,while the crystal zones of natural cellulose did not change.

关 键 词：撑篙竹 乙酸 乙醇法制浆 浆料性能 

分 类 号：TQ35[化学工程] TS743[轻工技术与工程—制浆造纸工程]