Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (06): 86-93.doi: 10.13475/j.fzxb.20210203908

• Textile Engineering • Previous Articles     Next Articles

Preparation and mechanical properties of polylactic acid nonwovens via post-drafting assisted melt blown process

SUN Huanwei1, ZHANG Heng1,2(), CUI Jingqiang2,3, ZHU Feichao4, WANG Guofeng2,3, SU Tianyang2,3, ZHEN Qi1   

  1. 1. Zhongyuan University of Technology, Zhengzhou, Henan 451191, China
    2. Henan Key Laboratory of Medical Polymer Materials Technology and Application, Xinxiang, Henan 453400, China
    3. Henan Tuoren Medical Device Co., Ltd., Xinxiang, Henan 453400, China
    4. College of Textile Science and Engineering(International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2021-02-15 Revised:2022-03-13 Online:2022-06-15 Published:2022-07-15
  • Contact: ZHANG Heng E-mail:zhangheng2699@zut.edu.cn

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Abstract:

In order to improve the mechanical properties of polylactic acid (PLA) melt blown nonwovens, samples of PLA melt blown nonwovens with high crystallinity were prepared by a large scale and one step post-drafting assisted melt blown process, based on the experimental analysis of the thermodynamic properties of PLA polymers. The morphology, tensile and bursting properties of the prepared samples were evaluated. The results show that the glass transition temperature and melting point of PLA were 60.69 ℃ and 162.6 ℃, respectively, suitable for the preparation at a high drafting ratio during the post-drafting assisted melt blown process. It was noted that with the drafting ratio increasing from 1.0 to 3.0, the proportion of high-oriented fibers (fiber orientation angle≤20°) was increased from 28% to 100%, and the proportion of the microfibers (fiber diameter ≤3 μm) was increased from 23% to 67%. The drafting ratio increase also caused the crystallinity to increase from 1.22% to 37.43%, the tensile breaking strength in machine direction to reach 4.33 N/mm2, and the bursting force to 36.8 N, demonstrating improvement of the mechanical properties of the PLA melt blown nonwovens due to the post-drafting assisted melt blown process.

Key words: nonwoven, polylactic acid, micro-nano fiber, post-drafting assisted melt blown process, mechanical property

CLC Number: 

  • TS176

Fig.1

Schematic diagram of preparation of PLA melt blown nonwovens by post-drafting assisted melt blown process"

Fig.2

DSC curves of PP, PE and PLA polymers.(a) Secondary heating curve; (b) Cooling curve"

Fig.3

Surface and cross-sectional SEM images of PLA melt blown nonwovens with different drafting ratios.(a)R=1.0;(b)R=1.8;(c)R=2.1;(d)R=2.4;(e)R=2.7;(f)R=3.0; (g)Untrimmed"

Fig.4

Schematic diagram of fiber orientation."

Fig.5

Fiber diameter distribution curves of PLA melt blown nonwovens"

Fig.6

Fiber orientation angle distribution curves of PLA melt blown nonwovens"

Fig.7

XRD curves(a) and crystallinity (b) of PLA melt blown nonwovens"

Fig.8

Tensile breaking strength-displacement curves of PLA melt blown nonwovens. (a) Machine direction;(b) Crosswise direction"

Tab.1

Tensile properties of samples of PLA melt blown nonwovens"

牵伸
倍率
R		 面密度/
(g·m-2)		 纵向断
裂强度/
(N·mm-2)		 纵向断
裂伸长
率/%		 横向断
裂强度/
(N·mm-2)		 横向断
裂伸长
率/%		 纵横向
强度比
1.0 119.90 1.92 6.14 1.75 8.10 1.10
1.8 113.00 3.47 3.58 0.51 43.62 6.80
2.1 107.80 3.86 3.30 0.36 43.80 10.72
2.4 92.40 4.01 3.19 0.34 44.93 11.79
2.7 84.60 4.20 3.06 0.32 57.53 13.13
3.0 80.10 4.33 2.63 0.31 75.43 13.97

Fig.9

Bursting curves of PLA melt blown nonwovens with different drafting ratios"

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