微纤化/纳米纤维素复合绝缘纸的力学特性及计算方法  

Mechanical Properties and Calculation Method of Micro/Nano Cellulose Composite Insulating Paper

作　　者：张大宁[1] 翟心楠 李璇 杨智 詹江杨 张冠军[1] ZHANG Daning;ZHAI Xinnan;LI Xuan;YANG Zhi;ZHAN Jiangyang;ZHANG Guanjun(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China;State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310007,China)

机构地区：[1]西安交通大学电工材料电气绝缘全国重点实验室,西安710049 [2]国网浙江省电力有限公司电力科学研究院,杭州310014 [3]国网浙江省电力有限公司,杭州310007

出　　处：《高电压技术》2024年第8期3625-3635,共11页High Voltage Engineering

基　　金：浙江省电力公司科技项目(5211DS230002)。

摘　　要：油纸绝缘变压器的绝缘纸处于强机械振动和机械冲击的作用环境中,这对绝缘纸的强度和抵抗变形的能力提出了很高的要求。因此,实现对纤维素绝缘纸机械性能的有效提升和准确预测至关重要。文中通过微纤化/纳米纤维素的体相掺杂,制备出不同质量分数的纳米纤维素晶须、纳米纤维素纤维和微纤化纤维素改性绝缘纸。然后对不同掺杂浓度下微纤化/纳米纤维素改性绝缘纸的微观形貌、应力-应变曲线和杨氏模量进行测量,对比了不同长径比的微纤化/纳米纤维素对绝缘纸机械性能的改性效果。从自身强度、形态、界面效应和团聚效应等方面分析了微纤化/纳米纤维素对绝缘纸的改性机理。在详细实验结果和综合分析的基础上,基于Halpin-Tsai模型对理想情况下填料改性作用的分析,考虑到团聚相和界面相的影响,实现了对不同掺杂浓度下改性绝缘纸杨氏模量的预测。独立实验验证表明,所提出的预测模型误差小于1.57%。该研究对实现绝缘纸的纳米改性和机械性能预测具有重要意义。The insulation paper in oil-paper insulated transformer is in the environments of strong mechanical vibration and mechanical impact,thus the strength of the insulation paper and the ability to resist deformation are highly required.Therefore,effective enhancement and accurate prediction of mechanical properties are crucial in the application of insu-lating paper.In this paper,by bulk phase doping of micro/nano cellulose,modified insulating paper with different mass fractions of nanocellulose whiskers,nanocellulose fibers and microcellulose were prepared.The microscopic morphology,stress-strain curves and Young’s modulus of the micro/nano cellulose-modified insulating paper were measured with the doping concentration;moreover,the modification effects of micro/nano cellulose with different aspect ratios on the me-chanical properties of the insulating paper were compared.The mechanism of micro/nano cellulose modification on insulating paper was analyzed in terms of its strength,morphology,interface,and agglomeration.Based on the detailed experiments results and comprehensive analysis,by analyzing the role of filler modification in the ideal condition based on the Halpin-Tsai model,the prediction of Young’s modulus of modified insulating paper with different doping concen-trations was achieved by considering the effects of agglomerated and interfacial phases.Independent experimental validation shows that the error of the proposed prediction model is less than 1.57%.This study is very benficial for nano modification and mechanical property prediction of cellulose paper.

关 键 词：微纤化纤维素 纳米纤维素:Halpin-Tasi模型 界面效应 团聚效应 

分 类 号：TM215.6[一般工业技术—材料科学与工程]