Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (08): 40-47.doi: 10.13475/j.fzxb.20210608708

• Fiber Materials • Previous Articles     Next Articles

Preparation and properties of poly(lactic acid)/ZnO fiber with antibacterial and anti-ultraviolet functions

ZHU Yanlong1,2, GU Yingshu1,2, GU Xiaoxia1,2, DONG Zhenfeng1,2, WANG Bin1,2, ZHANG Xiuqin1,2()   

  1. 1. Beijing Key Laboratory of Clothing Materials R & D and Assessment, Beijing Institute of Fashion Technology, Beijing 100029, China
    2. Beijing Engineering Research Center of Textile Nano Fiber, Beijing 100029, China
  • Received:2021-06-30 Revised:2022-01-25 Online:2022-08-15 Published:2022-08-24
  • Contact: ZHANG Xiuqin E-mail:clyzxq@bift.edu.cn

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Abstract:

In order to endow poly(lactic acid)( PLA ) fiber with high anti-ultraviolet and antibacterial properties, PLA/ZnO blends with different mass ratios were prepared via melt blending method applying ZnO as functional particles. According to the morphology, thermal properties, anti-ultraviolet and antibacterial properties of the blends, the optimal mass ratio of the blend was chosen which was further fabricated into PLA/ZnO fiber through melt spinning. When the mass fraction of ZnO masterbatch was 5％ with the mass fraction of ZnO being 0.85％, ZnO particles were uniformly distributed in the PLA matrix. The PLA/ZnO blend exhibited good thermal stability, excellent anti\|ultraviolet and antibacterial properties. The ultraviolet protection coefficient reached 663, and the antibacterial rate against Escherichia coli and Staphylococcus aureus was more than 99％. Moreover, the PLA/ZnO blend fiber showed good spinnability with crystallinity reaching more than 30％ and the fiber strength meeting the weaving requirements. The ultraviolet transmittance of the prepared PLA/ZnO fabric is less than 30％, and its antibacterial rate against Escherichia coli and Staphylococcus aureus is as high as 99％, which can also be maintained after 10 washes.

Key words: functional fiber, poly(lactic acid) fiber, zinc oxide, blending modification, antibacterial property, anti-ultraviolet property, melt spinning

CLC Number: 

  • TQ316.67

Tab.1

Proportion of pure PLA and its blends％"

样品编号 PLA质量分数 ZnO母粒质量分数
PLA 100 0
PLA/ZnO–3 97 3
PLA/ZnO–5 95 5
PLA/ZnO–10 90 10

Fig.1

PLA/ZnO blend fiber (a) and fabric (b)"

Fig.2

SEM images of cross section of pure PLA and its blends"

Fig.3

DSC curves of pure PLA and its blends. (a) First cooling curves; (b) Secondarytemperature rise curves"

Fig.4

TG(a)and DTG(b)curves of pure PLA and its blends"

Fig.5

Ultraviolet transmission curves of pure PLA and PLA/ZnO film"

Tab.2

Anti\|ultraviolet properties of pure PLA and PLA/ZnO film"

样品编号 平均UVA
透过率/％		 平均UVB
透过率/％		 UPF
平均值
PLA 83.80 65.32 1.43
PLA/ZnO–3 7.98 0.40 137
PLA/ZnO–5 2.45 0.06 663
PLA/ZnO–10 2.78 0.06 601

Tab.3

Antibacterial properties of pure PLA and PLA/ZnO film"

样品编号 抑菌率/％
对大肠杆菌 对金黄色葡萄球菌
PLA 29 54
PLA/ZnO–3 29 46
PLA/ZnO–5 >99 >99
PLA/ZnO–10 >99 >99

Fig.6

2-D WAXS patterns(a) and 1-D WAXS intensity profiles (b) of fibers"

Tab.4

Mechanical property data of fibers"

纤维名称 断裂强度/(cN·dtex–1) 断裂伸长率/％
PLA 3.4±0.1 23.9±1.5
PLA/ZnO–5 2.8±0.1 26.5±1.3

Fig.7

Ultraviolet transmission curves of fabric"

Fig.8

Antibacterial properties of fabrics against Escherichia coli and Staphylococcus aureus. (a) PLA fabric; (b) PLA/ZnO–5 fabric"

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