Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (10): 34-40.doi: 10.13475/j.fzxb.20201205207

• Fiber Materials • Previous Articles     Next Articles

Preparation and properties of viscose fibers modified with star-shaped halogen-free flame retardants

HE Ju1, LIU Xiaohui1(), SU Xiaowei1, LIN Shenggen1, REN Yuanlin2   

  1. 1. School of Material Science and Engineering, Tiangong University, Tianjin 300387, China
    2. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
  • Received:2020-12-18 Revised:2021-06-01 Online:2021-10-15 Published:2021-10-29
  • Contact: LIU Xiaohui E-mail:liuxiaohui@tiangong.edu.cn

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Abstract:

Aiming at the potential safety hazard caused by the flammability of viscose fibers, phosphonitrilic chloride trimer containing a ring structure was selected as a functional monomer to design a star-shaped halogen-free flame retardant that combines phosphorus, nitrogen, silicon ternary flame retardant elements. The flame retardant was added to the viscose, and then the flame retardant modified viscose fibers was prepared through wetting spinning. The structures and properties of the modified viscose fibers were characterized by means of Fourier infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analyzer, and thermogravimetric-mass spectrometry system. The results show that the flame retardancy of the modified viscose fibers was improved while the fibers maintaining the durability. In nitrogen atmosphere, its char residue rate at 800 ℃ increased from 12.5% to 31.2% compared with the unmodified viscose fibers. During the combustion process of the modified fibers, the release of combustible gas was significantly reduced and abundant expanded carbon layer was produced. The flame retardant operated in condensed phase and gas phase.

Key words: viscose fiber, blending modification, wetting spinning, flame retardant, phosphonitrilic chloride trimer, thermal stability, flame retardant mechanism

CLC Number: 

  • TS102.6

Fig.1

Preparation process of flame retardant"

Fig.2

1H NMR spectra of flame retardant"

Fig.3

FT-IR spectra of viscose fibers and flame retardant viscose fibers"

Fig.4

XPS analyses of viscose fibers, flame retardant viscose fibers before and after washed"

Fig.5

SEM images of viscose fibers (a), flame retardant viscose fibers (b) and char residues of flame retardant viscose fibers after combustion(c)"

Fig.6

TG (a) and DTG (b) curves of viscose fibers, flame retardant viscose fibers befoe and washed fibers in N2 atmosphere"

Fig.7

TG(a) and DTG(b) curves of viscose fibers, flame retardant viscose fibers before and washed fibers in air atmosphere"

Fig.8

Vertical flammability diagram of viscose fibers(a)and flame retardant viscose fibers(b)"

Fig.9

TG-MS analyses of viscose fibers and flame retardant viscose fibers"

Fig.10

Raman spectrum of flame retardant viscose fibers after combustion"

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