Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (02): 83-88.doi: 10.13475/j.fzxb.20181205006

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Ammonium modification of phytic acid and flame retardant finishing of Lyocell fabric

XU Ailing, WANG Chunmei()   

  1. School of Textile and Clothing, Nantong University, Nantong, Jiangsu 226019, China
  • Received:2018-12-24 Revised:2019-11-10 Online:2020-02-15 Published:2020-02-21
  • Contact: WANG Chunmei E-mail:w.cmei@ntu.edu.cn

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Abstract:

In order to improve the flame retardancy of Lyocell fabrics, the natural phytic acid was ammonium modified, and the dicyandiamide was used as catalyst for flame retardant finishing of Lyocell fabrics. The characteristic groups of phytic acid ammonium were characterized by Fourier transform infrared spectroscopy. By means of Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, vertical burning instrument and limiting oxygen index, the infrared absorption, surface morphology and thermal stability of the finishing Lyocell fabric were determined. The results show that, compared with the unfinished Lyocell fabric, the mass loss rate of endothermic degradation decreases by 20.11%, the amount of carbon increases by 27.98% at 800 ℃. The vertical burning damage length of the finished Lyocell fabric decreases to 3.4 cm, the limiting oxygen index is up to 36.6%, reaching an acceptible flame retardant level. After 20 standard washings, the Lyocell fabrics finished with the flame retardant can still reach the requirements set in standard GB B2.

Key words: phytic acid, ammonium modification, flame retardant finishing, Lyocell fabric, flame retardant fabric

CLC Number: 

  • TS195.2

Fig.1

FT-IR spectra of phytic acid ammonium,phytic acid and urea"

Fig.2

FT-IR spectra of phytic acid ammonium and untreated and treated Lyocell fabrics A—未整理;B—整理后未水洗;C—整理后水洗1次;D— 整理后水洗20次;E—植酸铵。"

Fig.3

TG and DTG curve of Lyocell fabric before and after flame retardant finishing"

Tab.1

Pyrolysis data of Lyocell fabric in nitrogen before and after flame retardant finishing"

样品 失重
阶段		 初始温
度/℃		 终止温
度/℃		 质量损
失率/%		 800 ℃残
余炭量/%
阶段1 28 220 6.14
原样 阶段2 220 359 61.13 8.55
阶段3 359 770 23.79
阶段1 28 174 6.00
整理织物 阶段2 174 357 41.02 36.53
阶段3 357 770 15.38

Fig.4

SEM images of untreated Lyocell fabrics (a),treated Lyocell fabrics (b) and treated Lyocell fabrics after 20 washing cycles (c) (×500)"

Fig.5

SEM images of untreated Lyocell fabrics(a),treated Lyocell fabrics(b) and treated lyocell fabrics after 20 washing cycles(c) (×3 000)"

Fig.6

SEM images of char residue of untreated Lyocell fabrics (a), treated Lyocell fabrics (b) and treated Lyocell fabrics after 20 washing cycles (c) (×3 000)"

Tab.2

Combustion performance of untreated and treated Lyocell fabrics"

样品 未水洗 水洗20次
LOI值/% 续燃时间/s 阴燃时间/s 损毁炭长/cm 续燃时间/s 阴燃时间/s 损毁炭长/cm
原织物 <25.0 23 134 30.0 25 130 30.0
整理织物 36.6 0 0 3.4 0 0 3.8

Fig.7

Fabric sample pictures after vertical burning experimental. (a) Untreated Lyocell fabrics; (b) Treated with 300 g/L phytic acid ammonium; (c) Treated Lyocell fabrics after 20 washing cycles"

Tab.3

Whiteness and physical properties of untreated and treated Lyocell fabric"

织物编号 抗弯长度/cm 白度/% 断裂强力/N
1# 3.5 77.8 752
2# 4.5 57.9 524
3# 4.2 64.2 486
4# 4.4 58.4 536
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