Journal of Textile Research ›› 2023, Vol. 44 ›› Issue (12): 26-34.doi: 10.13475/j.fzxb.20220702201

• Fiber Materials • Previous Articles     Next Articles

Preparation of polylactic acid/magnetic metal organic frame material composite melt-blown fabrics and air filtration performance

SUN Hui1,2, CUI Xiaogang1,2, PENG Siwei1,2, FENG Jiangli1,2, YU Bin1,2()   

  1. 1. College of Textile Science and Engineering(International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Zhejiang Provincial Innovation Center of Advanced Textile Technology, Shaoxing, Zhejiang 312000, China
  • Received:2022-12-08 Revised:2023-03-17 Online:2023-12-15 Published:2024-01-22

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Abstract:

Objective The rapid development of modern industry and agriculture has promoted the progress of society and improved the quality of people's life. However, the air pollution problem accompanied by the development also poses a serious threat to public health. Melt-blown filter materials with the advantages of high protection, simple preparation process and low price can provide strong defense for human health. In order to prepare the magnetic biodegradable melt-blown air filter material with high filtration efficiency, a magnetic metal organic frame mate-rial (MMOF) was synthesized and mixed with polylactic acid (PLA) to prepare PLA/MMOF composite melt-blown fabrics.
Method MMOF was first synthesized via the hydrothermal method and mixed with PLA resin in different mass ratios by the melt blending in a twin-screw extruder. Then these blends were granulated to obtain PLA/MMOF composite master batches. After that, PLA/MMOF composite master batches were fabricated into the composite melt-blown fabrics with different mass ratios by use of a micro melt-blown testing machine. The morphology, structure, thermal behavior, magnetism, air filtration and mechanical properties of PLA/MMOF composite melt-blown fabrics were characterized and studied.
Results It could be seen that the fiber surface of pure PLA melt-blown fabrics was smooth and had a few small grooves. For PLA/MMOF composite melt-blown fabrics, some MMOF particles appeared on the fiber surface. The fiber surface of the composite melt-blown fabrics became more and more rough with the increasing of the mass of MMOF (Fig. 1). Moreover, the average fiber diameter and pore size of PLA/MMOF composite melt-blown fabrics also increased when the mass of MMOF increased (Fig. 2 and Fig. 3). The addition of MMOF did not change the crystalline structure of PLA, but the higher mass of MMOF inhibited the PLA crystallization (Fig. 4). When the mass ratio of PLA to MMOF was 1:0.03 and 1:0.05, the glass transition temperature of the composite melt-blown fabrics slightly enhanced compared to the pure PLA melt-blown fabric. The crystalline and melting temperatures of the composite melt-blown fabrics increased with the increasing of the mass of MMOF. The moderate input of MMOF had a heterogeneous nucleation effect on PLA crystallization (Fig. 5 and Tab. 2). When the mass of MMOF increased, the saturation magnetic strength of PLA/MMOF composite melt-blown fabrics was also continuously enhanced (Fig. 6). In comparison to the pure PLA melt-blown fabric, the air permeability of the composite melt-blown fabrics was increased, while the filtration resistance reduced. The filtration efficiency of PLA/MMOF composite melt-blown fabric reached the maximum of 65.03% when the mass ratio of PLA to MMOF was 1:0.03 (Fig. 7). The tensile strength of pure PLA melt-blown fabric was about 0.16 MPa, and the elongation at break was about 76.80%. When MMOF was incorporated, the tensile strength of the composite melt-blown materials first enhanced and then reduced. The tensile strength reached the maximum of 0.21 MPa when the mass ratio of PLA to MMOF was 1:0.03. On the other hand, the elongation at break of the composite melt-blown fabrics enhanced with the increasing of MMOF mass (Fig. 8 and Tab. 3).
Conclusion The incorporation of MMOF endows the PLA/MMOF composite melt-blown fabrics with magnetism and improves the air filtration performances. When the mass ratio of PLA to MMOF is 1:0.03, the filtration efficiency and tensile strength of the composite melt-blown fabric reach the maximum. It is believed that PLA/MMOF composite melt-blown fabric with a mass ratio of PLA to MMOF is 1:0.03 has the optimal overall performances. The finding of this research provides some theoretical references for the development of magnetic PLA-based melt-blown filter materials.

Key words: polylactic acid, magnetic metal organic frame material, melt-blown material, air filtration performance, biodegradablility

CLC Number: 

  • TS176

Tab. 1

Mass ratios of PLA/MMOF composite melt-blown fabrics"

样品编号 PLA与MMOF的质量比
M1 1:0
M2 1:0.01
M3 1:0.03
M4 1:0.05
M5 1:0.07

Fig. 1

SEM images of pure PLA and PLA/MMOF composite melt-blown fabrics with different mass ratios"

Fig. 2

Fiber diameter distribution diagrams of pure PLA and PLA/MMOF composite melt-blown fabrics with different mass ratios"

Fig. 3

Pore diameter distribution diagrams of pure PLA and PLA/MMOF composite melt-blown fabrics with different mass ratios"

Fig. 4

XRD patterns of pure PLA and PLA/MMOF composite melt-blown fabrics with different mass ratios"

Fig. 5

DSC curves of pure PLA and PLA/MMOF composite melt-blown fabrics with different mass ratios"

Tab. 2

Thermal properties parameters of pure PLA and PLA/MMOF composite melt-blown fabrics with different mass ratios"

样品编号 Tg/℃ Tcc/℃ Tm1/℃ Tm2/℃ Xc/%
M1 58.93 110.93 145.93 157.93 3.06
M2 58.93 109.93 147.93 159.93 3.35
M3 58.93 111.93 146.93 158.93 3.03
M4 59.93 112.93 148.93 160.93 2.34
M5 59.93 115.93 149.93 160.93 2.12

Fig. 6

Magnetic hysteresis curves of PLA/MMOF composite melt-blown fabrics with different mass ratios"

Fig. 7

Air filtration efficiency and resistance(a) and air permeability(b) of pure PLA and PLA/MMOF composite melt-blown fabrics with different mass ratios"

Fig. 8

Stress-strain curves of pure PLA and PLA/MMOF composite melt-blown fabrics with different mass ratios"

Tab. 3

Tensile properties parameters of pure PLA and PLA/MMOF composite melt-blown fabrics with different mass ratios"

样品编号 断裂强度/MPa 断裂伸长率/%
M1 0.16±0.040 76.80±1.35
M2 0.20±0.013 93.77±2.78
M3 0.21±0.057 97.20±2.05
M4 0.15±0.098 108.96±3.96
M5 0.13±0.023 111.33±4.93
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