机械处理对未漂硫酸盐针叶木浆纤维中羟基可及性的影响  

Effect of mechanical treatment on the accessibility of hydroxyl groups on unbleached kraft softwood pulp fibers

作　　者：李迪 罗清 石忠收 黄晔 张宴臣 戴磊 LI Di;LUO Qing;SHI Zhong-shou;HUANG Ye;ZHANG Yan-chen;DAI Lei(College of Bioresources Chemical and Materials Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China;Wuzhou Specialty Paper Group Corporation,Quzhou 324000,China;College of Textile Science and Engineering,Key Laboratory of Ecological Textile,Ministry of Education,Jiangnan University,Wuxi 214122,China)

机构地区：[1]陕西科技大学轻工科学与工程学院,陕西西安710021 [2]五洲特种纸业集团股份有限公司,浙江衢州324000 [3]江南大学纺织科学与工程学院生态纺织教育部重点实验室,江苏无锡214122

出　　处：《陕西科技大学学报》2024年第4期1-10,共10页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(22178208)。

摘　　要：纤维素纤维中羟基官能团的可及性对纤维素的利用具有重要影响,而机械处理是一种有效的调控手段.鉴于此,本工作采用Valley打浆机对未漂硫酸盐针叶木浆进行机械处理,探究了不同机械处理压力以及机械处理时间对未漂硫酸盐针叶木浆纤维中羟基可及性的影响.具体地,研究中针对不同机械处理条件下与羟基可及性密切相关的纤维滤水和保水性能、纤维的形态变化、纤维水悬浮体系的稳定性以及纤维结合性等的分析,揭示了机械处理条件对未漂硫酸盐针叶木浆纤维羟基可及性的影响,此外,研究中也采用了红外与ζ-电位分析揭示了纤维中羟基可及性的变化.结果表明:增大机械处理压力及延长机械处理时间能够有效提高未漂硫酸盐针叶木浆纤维羟基的可及性,相应地,纤维打浆度更高,纤维的滤水性能变差,保水性能改善,纤维的长度、粗度、宽度等形态参数减小,Zeta电位值升高,纤维分散度提升且纤维素纤维结合成纸的匀度指数和抗张指数显著提高.原因在于机械处理过程中纤维受到切断与剪切分丝作用,游离出更多的羟基官能团,显著改善了羟基可及性.研究结果还证实了提高机械处理压力比延长处理时间效果更为显著.本研究揭示了机械处理对纤维素纤维中羟基可及性的影响规律,对纤维素材料的多功能应用研究具有一定的指导意义.The availability of hydroxyl functional groups in cellulose fibers has an important impact on the utilization of cellulose,and mechanical treatment is an effective means of regulation.Herein,we adopted the Valley pulper to mechanically treat the unbleached kraft softwood pulp to disclose the influence of different mechanical treatment pressure and mechanical treatment time on the accessibility of hydroxyl groups on unbleached kraft softwood pulp fibers.Specifically,the effects of mechanical treatment conditions on the hydroxyl group accessibility of unbleached kraft softwood pulp fibers were revealed by analyzing the water filtration and retention properties of the fibers,the morphological changes of the fibers,the stability of the fiber-water suspension system,and the fiber-binding properties,which are closely related to the hydroxyl group accessibility under different mechanical treatment conditions,and the changes of the hydroxyl group accessibility of the fibers were revealed by using the FTIR andζ-potential analyses in the study.The results show that increasing the mechanical treatment pressure and prolonging the mechanical treatment time can effectively improve the accessibility of the hydroxyl group of unbleached kraft softwood pulp fibers,correspondingly,the fiber pulping degree is higher,the water filtration performance of the fiber is worse,the water retention performance is improved,the morphological parameters such as length,thickness and width of the fiber are reduced,the zeta potential value is increased,the fiber dispersion is improved,and the evenness index and tensile index of the cellulose fiber combined into the paper are significantly improved.The reason is that the fibers were cut and sheared during mechanical treatment,and more hydroxyl functional groups were released,which significantly improved the hydroxyl accessibility.The results also confirmed that increasing the mechanical treatment pressure was more effective than prolonging the treatment time.This study reveals the effect of mechan

关 键 词：机械处理 纤维素纤维 羟基可及性 

分 类 号：TS752[轻工技术与工程—制浆造纸工程]