Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (04): 132-138.doi: 10.13475/j.fzxb.20200203107

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Construction of bio-based three-component self-assembled coating for flame retardancy of ramie fabrics

WANG Huaqing1, YAN Hongqiang2()   

  1. 1. Zhejiang Fashion Institute of Technology, Ningbo, Zhejiang 315211, China
    2. Institute of Polymer Material and Engineering, Ningbotech University, Ningbo, Zhejiang 315100, China
  • Received:2020-02-17 Revised:2021-01-18 Online:2021-04-15 Published:2021-04-20
  • Contact: YAN Hongqiang E-mail:yanhongqiang@nit.net.cn

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Abstract:

In order to solve the flammability of ramie fibers and their reinforced composites, sodium alginate (SA) and poly (diphenolic acid-phenyl phosphate) ((poly(DPA-PDCP)) from biomass were used as the polyanion electrolyte and polyethyleneimine (PEI) as the polycation electrolyte, three-component (SA/PEI/poly(DPA-PDCP)/PEI)n flame retardant coating was constructed on the surface of ramie fabrics by layer-by-layer assembly technique. The morphology, thermal stability and flame retardancy of the coating and hence the coated fabrics were characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analyzer, microscale combustion calorimetry, vertical combustion tester. The experimental results show that a multi-layered, thick and dense (SA/PEI/poly(DPA-PDCP)/PEI)n flame retardant coating is successfully constructed on the surface of ramie fabrics. This flame retardant coating reduces significantly the thermal decomposition rate of ramie fabrics, forming a thick and dense intumescent flame retardant carbon layer on its surface, which insulates effectively the heat and oxygen, improves its thermal stability and carbon forming ability, and gives the ramie fabrics excellent flame retardancy. This research demonstrates a solution to the problem of poor flame retardancy of ramie reinforced composites.

Key words: ramie fabric, bio-based flame retardant, layer-by-layer assembly, flame retardancy, functional fabric

CLC Number: 

  • TB324

Fig.1

Schematic representation construction of SA/PEI/poly(DPA-PDCP) coating on ramie fabric by LbL assembly"

Tab.1

Percentage of mass increase of pristine and coated ramie fabrics"

样品编号 样品名称 质量增加率/%
n-0 未处理的苎麻织物 —
S-1 (SA/PEI/poly(DPA-PDCP)/PEI)1 3.10
P-1 (poly(DPA-PDCP)/PEI/SA/PEI)1 2.03
S-5 (SA/PEI/poly(DPA-PDCP)/PEI)5 10.85
P-5 (poly(DPA-PDCP)/PEI/SA/PEI)5 8.68
S-10 (SA/PEI/poly(DPA-PDCP)/PEI)10 20.56
P-10 (poly(DPA-PDCP)/PEI/SA/PEI)10 18.46

Fig.2

ATR-FT-IR spectra of pristine and coated ramie fabrics"

Fig.3

SEM images of pristine and (SA/PEI/poly(DPA-PDCP)/PEI)n coated ramie fabrics"

Fig.4

TG (a) and DTG (b) curves of pristine and (SA/PEI/poly(DPA-PDCP)/PEI)n coated ramie fabrics under N2 atmosphere"

Fig.5

TG (a) and DTG (b) curves of pristine and (SA/PEI/poly(DPA-PDCP)/PEI)n coated ramie fabrics under air atmosphere"

Tab.2

TG results of pristine and (SA/PEI/poly(DPA-PDCP)/PEI)n coated ramie fabrics"

测试气氛 样品编号 T5%/℃ Tmax1/℃ 第1分解峰峰值/
(%·min-1)		 Tmax2/℃ 第2分解峰峰值/
(%·min-1)		 600 ℃时的
残炭率/%
氮气 n-0 339.0 378.0 -41.87 — — 16.8
S-1 331.0 367.0 -42.64 — — 18.9
S-5 300.0 357.0 -23.49 — — 27.1
S-10 240.4 350.4 -23.86 — — 27.1
空气 n-0 331.3 353.3 -78.96 483.3 -5.76 3.7
S-1 323.9 350.3 -59.17 501.8 -5.37 2.7
S-5 305.0 346.0 -24.88 527.0 -6.42 5.0
S-10 249.8 344.0 -25.34 531.7 -5.67 10.9

Fig.6

MCC curves of pristine and (SA/PEI/poly (DPA-PDCP)/PEI)n coated ramie fabrics"

Tab.3

MCC and LOI test results of pristine and (SA/PEI/poly(DPA-PDCP)/PEI)n coated ramie fabrics"

样品编号 热释放焓/(J·g-1·K-1) 总热释放量/(kJ·g-1) 热释放速率峰值/(W·g-1) 热释放速率峰值温度/℃ LOI值/%
n-0 230 9.2 237.5 381.3 18.4
S-1 212 8.3 219.4 372.8 20.3
S-5 158 6.0 165.9 358.5 23.2
S-10 142 4.8 149.5 352.0 26.3

Fig.7

Images of vertical ?ame tests for pristine and (SA/PEI/poly(DPA-PDCP)/PEI)n coated ramie fabrics. (a) After 5 s ignition; (b) Char residues after vertical combustion test"

Fig.8

SEM images of residual carbon for pristine and (SA/PEI/poly(DPA-PDCP)/PEI)n coated ramie fabrics after vertical flame tests"

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