Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (11): 103-109.doi: 10.13475/j.fzxb.20201206407

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation and properties of flame retardant polyester/cotton blended fabrics by layer-by-layer assemblying polyethylenimine/phytic acid

LIU Xinhua1,2(), LIU Hailong1, FANG Yinchun1, YAN Peng1, HOU Guangkai1   

  1. 1. College of Textile and Garment, Anhui Polytechnic University, Wuhu, Anhui 241000, China
    2. Anhui Textile Industry Science and Technology Public Service Platform, Wuhu, Anhui 241000, China
  • Received:2020-12-13 Revised:2021-07-02 Online:2021-11-15 Published:2021-11-29

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Abstract:

In order to achieve environmental friendly flame retardancy of polyester/cotton fabrics, PEI/PA flame retardant coating was constructed on the surface of polyester/cotton fabrics using polyethyleneimine (PEI) and phytic acid (PA) as raw materials based on the layer-by-layer assembly (LBL) method. The infrared characteristic absorption, microscopic morphology, thermal stability and flame retardant properties of the polyester/cotton fabrics before and after finishing were characterized and evaluated using Fourier infrared spectroscopy, scanning electron microscopy, limiting oxygen index (LOI) tester and vertical combustion tester. The results show that PEI/PA flame retardant coating is successfully constructed on the polyester/cotton fabric using the LBL method. Compared with the unfinished polyester/cotton fabric, the LOI value of polyester/cotton fabric treated with PEI/PA coating reached 32.3%, its char length reduced to 98 mm. Both the after-flame time and after-glow time were 0 s, no molten droplets were generated, and the breaking strength and whiteness of the fabric were less influenced by the treatment, and the thermal stability of polyester/cotton fabric was improved to form a stable char layer.The LOI value of finished fabrics after 20 times washing was still over 26% showing good washing durability.

Key words: polyester/cotton fabric, flame retardant finishing, phytic acid, layer-by-layer assembly, durability, functional textile, flame retardant fabric

CLC Number: 

  • TS195.592

Tab.1

Mass fraction of PA solution during layer-by-layer assembly"

溶液
编号		 PA溶液质量分数/%
第1层 第2层 第3层 第4层
1# 1.5 1.5 3 3
2# 1.5 3 3 3
3# 2 2 3 3
4# 2 3 3 3
5# 3 3 3 3

Fig.1

FT-IR spectra of polyester/cotton fabric before and after flame retardant finishing"

Fig.2

SEM images of polyester/cotton fabrics before and after flame retardant finishing (×3 000)"

Tab.2

Flame retardant propertie of polyester/cotton fabrics before and after flame retardant finishing"

样品
编号		 质量增
加率/%		 LOI
值/%		 损毁长
度/mm		 续燃时
间/s		 阴燃时
间/s
PA-0 — 17.7 300.0 14.1 0
PA-a 45.40 28.7 105.5 0 0
PA-b 55.79 30.8 101.5 0 0
PA-c 50.00 31.5 100.0 0 0
PA-d 65.15 31.8 98.5 0 0
PA-e 67.56 32.3 98.0 0 0

Fig.3

Vertical combustion images of polyester/cotton fabrics before and after flame retardant finishing"

Tab.3

Physical and mechanical properties of polyester/cotton fabrics before and after flame retardant finishing"

样品编号 白度/% 断裂强力保留率/% 抗弯长度/mm
PA-0 85.8 — 20.8
PA-a 76.8 95.83 32.6
PA-b 73.7 97.31 36.6
PA-c 76.0 96.76 38.0
PA-d 70.0 91.40 42.1
PA-e 74.4 90.50 41.6

Tab.4

Flame retardant properties of finished polyester/cotton fabrics after different times washing"

样品
编号		 LOI值/% 20次洗涤垂直燃烧
0次
洗涤		 5次
洗涤		 10次
洗涤		 20次
洗涤		 损毁长
度/mm		 续燃时
间/s		 阴燃时
间/s
PA-a 28.7 26.6 26.0 25.0 283.0 0 0
PA-b 30.8 28.5 27.7 26.0 194.0 0 0
PA-c 31.5 28.3 27.3 26.6 152.0 0 0
PA-d 31.8 29.0 28.3 27.0 143.0 0 0
PA-e 32.3 28.8 27.5 26.0 210.0 0 0

Fig.4

Vertical combustion diagram of polyester/cotton fabrics after flame retardant finishing after 20 times washing"

Fig.5

TG(a)and DTG(b) curves of polyester/cotton fabrics under nitrogen atmosphere"

Tab.5

Thermogravimetric analysis data of polyester/cotton fabrics under nitrogen atmosphere"

样品
编号		 T-10%/
℃		 第1阶段 第2阶段 600 ℃残
炭量/%
T1max/
℃		 R1max/
(%·℃-1)		 T2max/
℃		 R2max/
(%·℃-1)
PA-0 360 368 1.16 439 4.27 5.4
PA-a 313 306 0.60 405 2.81 12.6
PA-b 310 313 0.58 403 2.52 16.3
PA-c 308 312 0.56 401 2.53 8.6
PA-d 307 308 0.55 389 2.70 26.8
PA-e 306 307 0.54 383 2.30 38.2

Fig.6

SEM images of carbon residue before and after finishing of polyester/cotton fabrics(×600)"

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