The Influence of Heat Setting Process on the Microstructure and Performance of Wet-process Separator under the Tensile External Field

Cai-xia Wan; Yue-qin Wang; Yu-tao Hu; Shi-jiao Zhou; Hong-qin Song; Han-fei Xu; Liang-bin Li

doi:10.11777/j.issn1000-3304.2021.21248

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The Influence of Heat Setting Process on the Microstructure and Performance of Wet-process Separator under the Tensile External Field

Research Article | 更新时间：2024-10-08

- The Influence of Heat Setting Process on the Microstructure and Performance of Wet-process Separator under the Tensile External Field
- ACTA POLYMERICA SINICA Vol. 53, Issue 3, Pages: 245-253(2022)
- 作者机构：
  
  1.中国科学技术大学国家同步辐射实验室合肥 230029
  2.乐凯胶片股份有限公司保定 071054
- 作者简介：
  
  Liang-bin Li, E-mail: lbli@ustc.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2021.21248
  CLC：
- Published：20 March 2022，
  
  Published Online：23 December 2021，
  
  Received：27 August 2021，
  
  Accepted：03 November 2021
- 稿件说明：
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万彩霞,王月勤,胡玉涛等.拉伸外场作用下热定型工艺对湿法隔膜微观结构及性能影响关系研究[J].高分子学报,2022,53(03):245-253.

Wan Cai-xia,Wang Yue-qin,Hu Yu-tao,et al.The Influence of Heat Setting Process on the Microstructure and Performance of Wet-process Separator under the Tensile External Field[J].ACTA POLYMERICA SINICA,2022,53(03):245-253.
万彩霞,王月勤,胡玉涛等.拉伸外场作用下热定型工艺对湿法隔膜微观结构及性能影响关系研究[J].高分子学报,2022,53(03):245-253. DOI： 10.11777/j.issn1000-3304.2021.21248.

Wan Cai-xia,Wang Yue-qin,Hu Yu-tao,et al.The Influence of Heat Setting Process on the Microstructure and Performance of Wet-process Separator under the Tensile External Field[J].ACTA POLYMERICA SINICA,2022,53(03):245-253. DOI： 10.11777/j.issn1000-3304.2021.21248.

摘要

在湿法隔膜制备过程中，热定型工艺与常规热定型工艺有所不同，在高温处理同时还需要对隔膜进行拉伸回缩，即湿法隔膜在热定型过程中存在拉伸外场和温度场耦合作用. 本文通过设计不同拉伸比与回缩比，研究了热定型工艺中拉伸外场(拉伸比、回缩比)对隔膜微观结构及宏观热收缩性能的影响关系. 结果发现，小的拉伸比(≤1.3)仅作用于聚乙烯的无定型区，随拉伸比增大，聚乙烯晶体开始被拉伸破坏，导致结晶度和晶粒尺寸均减小. 同时随拉伸比增大，湿法隔膜孔径呈增大趋势，而回缩比增大同样会使得隔膜孔径增大，在回缩过程中隔膜内部会发生纤维融合和孔隙增大. 此外，拉伸比和回缩比增大有利于隔膜内应力的释放，使得隔膜TD热收缩率明显减小.

Abstract

In the producing process of wet-process separator

the heat setting process is different from the conventional one

because in addition to the high temperature treatment

the separator also needs to be stretched and retracted. That is

the coupling effect of stretching external field and temperature field act on the wet separator during the heat setting process. In this study

by designing different draw ratios and retraction ratios

the influence of the external stretching field (draw ratio

retraction ratio) on the microstructure and macro thermal shrinkage properties of the separators during the heat setting process is studied. It was found that a small draw ratio (≤1.3) only acts on the amorphous region of polyethylene. As the draw ratio increases

the polyethylene crystals begin to be stretched and destroyed

resulting in the decrease of crystallinity and crystal size. At the same time

increasing draw ratio could enlarge the pore diameter of the wet separator. While the pore diameter of the separator also increases with the retraction ratio

indicating that the fiber fusion and pore enlargement occur during the retraction process. In addition

the increase of the draw ratio and the retraction ratio is beneficial to the release of the internal stress in separator

so that the TD thermal shrinkage of the separator is significantly reduced.

关键词

湿法隔膜内应力热定型孔径热收缩

Keywords

Wet-Process separatorInternal stressHeat settingPore sizeHeat shrinkage

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