废旧棉/纳米纤维素自增强复合纸的制备与性能  

Preparation and properties of waste cotton/cellulose nanofiber self-reinforcing composite paper

作　　者：刘鑫 王婵[1,2] 窦皓 孟家光 陈莉[1,2] 樊威 LIU Xin;WANG Chan;DOU Hao;MENG Jiaguang;CHEN Li;FAN Wei(School of Textile Science and Engineering,Xi'an Polytechnic University,Xi'an,Shaanxi 710048,China;Key Laboratory of Functional Textile Material and Product,Ministry of Education,Xi'an Polytechnic University,Xi'an,Shaanxi 710048,China)

机构地区：[1]西安工程大学纺织科学与工程学院,陕西西安710048 [2]西安工程大学功能性纺织材料及制品教育部重点实验室,陕西西安710048

出　　处：《纺织学报》2024年第6期39-45,共7页Journal of Textile Research

基　　金：国家自然科学基金项目(52073224);陕西省杰出青年科学基金项目(2024JC-JCQN-03);西安市科技局先进制造业技术攻关项目(21XJZZ0019);西安工程大学研究生创新基金项目(chx2022002)。

摘　　要：针对机械开松回收后产生的废旧棉短纤维存在力学性能差且难以再利用的问题,将部分回收的废旧棉短纤维在2,2,6,6-四甲基哌啶-1-氧自由基(TEMPO)/NaBr/NaClO体系中氧化,制备成纳米纤维素(CNF),然后将不同质量分数的CNF悬浮液和回收的废旧棉短纤维充分混合制备全纤维素纸浆,最后通过湿法成网和热压技术形成全纤维素纤维自增强复合纸(CCP),并探究其形貌、力学性能以及增强机制。结果表明:当CNF质量分数增加至5%时,CCP中的氢键含量增加,CNF和棉短纤维之间形成了广泛的氢键交联,促成CCP形成了致密的结构,其拉伸断裂强度达到84.72 MPa。此外,采用不脱色废旧棉短纤维制备的CCP可加工为包装纸袋使用。Objective Cotton waste accounts for 35%-40%of the global textiles waste of more than 100 million tons annually,with a low recycling rate of less than 30%.In particular,the fallen cotton fibers less than 7 mm during the mechanical opening process are not used because they are too short to be processed into fiber nets or other forms of textiles.It is imperative for such short cotton fibers with or without dyes to be recycled to avoid environmental pollution and recycle these high-quality cellulose resources.Method Aiming at the problems that the waste cotton short fibers produced after mechanical opening and recycling have poor mechanical properties and are difficult to reuse,the part recovered waste cotton short fibers were oxidized in 2,2,6,6-tetramethylpiperidine-1-oxide radical(TEMPO)/NaBr/NaClO system to prepare cellulose nanofiber(CNF).CNF suspension with different concentrations and recycled waste cotton short fibers were thoroughly mixed to prepare all cellulose pulp.Finally,the full cellulose fiber self-reinforced composite paper(CCP)was formed by wet-laid forming and hot-pressing technology.The CCP was prepared from waste denim to maximize the use of very short cotton fibers.The morphology,mechanical properties,and reinforcement mechanism of CPP were characterized and analyzed.Results CNF was successfully prepared by the TEMPO oxidation method,and the obtained CNF had a regular long strips with the length of about 0.8-1.2μm and the diameter of about 10-35 nm.The FI-TR showed-1 that there were absorption peaks corresponding to—COOH or its derivatives at 1755 cm and 1670 cm-1.This indicated that the cotton short fiber was successfully oxidized by the TEMPO/NaBr/NaClO oxidation system to introduce carboxyl groups and transferred into CNF.In the aspect of CCP morphology,the surface pores of CCP decreased significantly with the increase of CNF concentration,leading to dense structure of CCP,and the pores on the surface and cross section of CCP with 5%CNF were filled.This indicates that CNF as a reinforcing

关 键 词：废旧棉 纳米纤维素 回收利用 复合纸 自增强 湿法成网 热压技术 

分 类 号：TS119[轻工技术与工程—纺织材料与纺织品设计]