杂细胞含量对竹溶解浆烧碱-蒽醌蒸煮及ECF漂白的影响  

Effect of Parenchymal Cell Content on Soda-AQ Cooking and ECF Bleaching of Bamboo Dissolving Pulp

作　　者：王君玫 廖强 阮基灿 李鸣 徐鼎峰 李星星 Wang Junmei;Liao Qiang;Ruan Jican;Li Ming;Xu Dingfeng;Li Xingxing(School of Chemistry and Chemical Engineering,Engineering Research Center of Bamboo Advanced Materials and Conversion of Jiangxi Province,Jiangxi Key Laboratory of Bamboo Fiber Composites,Gannan Normal University,Ganzhou 341000,Jiangxi,China)

机构地区：[1]赣南师范大学化学化工学院,江西省竹新材料与转化工程研究中心,竹纤维复合材料江西省重点实验室,江西赣州341000

出　　处：《世界竹藤通讯》2024年第6期1-11,共11页World Bamboo and Rattan

基　　金：国家自然科学基金地区项目(52463011,52363012);江西省主要学科学术和技术带头人培养计划—青年人才项目(20212BCJL23048)。

摘　　要：以2年生毛竹为原料,利用预水解硫酸盐法和磨浆处理分离得到中空杂细胞微胶囊和竹原纤维粗浆,通过控制二者的不同质量比研究杂细胞含量对竹溶解浆烧碱-蒽醌蒸煮和ECF漂白工艺条件的影响。结果表明:在烧碱-蒽醌蒸煮过程中,随着杂细胞含量的增加,烧碱-蒽醌蒸煮后的竹浆得率、α-纤维素、卡伯值、残碱量和特性粘度显著降低,而其灰分、铁含量和白度随杂细胞含量增加呈增加趋势。在ECF漂白过程中,随着杂细胞含量的增加,竹溶解浆的得率、抗碱性和特性粘度显著降低,而其铁含量、S10和S18显著升高,其白度、灰分和二氯甲烷抽出物随着杂细胞含量的升高变化不明显,基本达到竹溶解浆行业标准要求。综合分析,杂细胞对烧碱-蒽醌蒸煮工艺的影响大于对ECF漂白工艺的影响。杂细胞含量越低,竹溶解浆的均匀性和品质越高。综合考虑认为,杂细胞含量低于10%的竹溶解浆适合用于粘胶纤维生产,而通过螯合剂去除铁离子和去除低分子量的半纤维素和纤维素是生产Lyocell纤维用竹溶解浆的关键。With 2-year-old Phyllostachys pubescens as the material,the study uses prehydrolytic sulfate process and defibrination treatment to separate parenchyma cells(PCs)and fiber cells(FCs)and analyze the effect of PC content on SAQ cooking and elemental chlorine-free(ECF)bleaching of bamboo dissolving pulp(BDP)by controlling the different mass rates between PCs and FCs.The results show that,after the Soda-AQ cooking,the yield,α-cellulose,Kappa number,residual alkali and intrinsic viscosity of bamboo pulp decrease significantly with the increase of PC content,while the ash,iron content and whiteness of bamboo pulp increase with the increase of PC content.During ECF bleaching,the BDP's yield,alkali resistance and intrinsic viscosity decrease significantly with the increase of PC content,while its iron content,S10 and S18 increase significantly.No significant changes happen in whiteness,ash and dichloromethane-extracted of the pulp,which indicates that the BDP basically meets the industry standard requirements.To sum up,PCs have greater influence on the process of SAQ than on ECF bleaching process,and the lower the PC content is,the better uniformity and the higher cellulose content the BDP will have.The BDP with less than 10%PC content is suitable for the production of viscose fibers.However,the removal of iron ions and low molecular weight alkali-soluble matters is still the key to the production of BDP for Lyocell fibers.

关 键 词：毛竹 杂细胞 溶解浆 烧碱-蒽醌蒸煮 ECF漂白 

分 类 号：TS7[轻工技术与工程—制浆造纸工程]