Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (01): 10-15.doi: 10.13475/j.fzxb.20200606006

• Fiber Materials • Previous Articles     Next Articles

Preparation and properties of sol-gel modified flame retardant viscose fiber

MA Junzhi1,2, GE Hong2, WANG Dong1, FU Shaohai1()   

  1. 1. Key Laboratory of Eco-Textiles (Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
    2. CHTC Helon (Weifang) New Materials Co., Ltd., Weifang, Shandong 261100, China
  • Received:2020-06-19 Revised:2020-10-18 Online:2021-01-15 Published:2021-01-21
  • Contact: FU Shaohai E-mail:shaohaifu@hotmail.com

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Abstract:

In order to improve the flame-retardant properties of viscose/dithiopyrophosphate (VF/DDPS) fibers, the sol-gel technology was used to modify the VF/DDPS fiber surface via the hydrolysis of tetraethyl orthosilicate (TEOS). The structures and properties of the modified flame retardant viscose fibers (VF/DDPS/TEOS) were characterized by means of scanning electron microscope, X-ray photoelectron spectroscopy, thermogravimetric analyzer, cone calorimeter,micro combustion calorimeter, and single fiber strength analyzer. The results show that the flame retardancy of VF/DDPS/TEOS fiber was improved with the increase of char residues from 3.23% to 7.93% at 750 ℃. Moreover, the ignition time of VF/DDPS/TEOS fiber is extended from 4 s to 16 s, peak heat release rate and total heat release are decreased by 19.3% and 16.0% respectively, and limiting oxygen index is increased from 28.2% to 29.3%. The surface of VF/DDPS/TEOS fibers forms a dense silica protective film, and the silica significantly enhances the thermal and mass barrier of the carbon layer on the fiber surface during combustion. However, the breaking strength, elongation at break and hygroscopicity of the modified fiber are decreased.

Key words: viscose fiber, sol-gel method, bisneopentyl glycol dithiopyrophosphate, tetraethyl orthosilicate, flame retardancy

CLC Number: 

  • TS102.6

Fig.1

SEM images of fibers before and after TEOS flame retardant modification"

Fig.2

TG(a)and DTG(b)curves of fibers before and after TEOS flame retardant modification"

Fig.3

Combustion properties of fibers before and after TEOS flame retardant modification. (a)Heat release rate; (b) Total heat release"

Tab.1

Combustion performance data of fibers"

样品名称 锥形量热仪 微型量热仪 极限氧
指数值/%
引燃
时间/s		 熄火
时间/s		 热释放速率峰值/
(kW·m-2)		 总放热量/
(MJ·m-2)		 热释放速率峰值/
(W·g-1)		 燃烧热量/
(J·g-1)		 点燃
温度/℃
VF/DDPS 4 198 128.5 11.9 229.4 7.5 285.9 28.2
VF/DDPS/TEOS 16 112 123.1 10.8 185.1 6.3 287.1 29.3

Fig.4

Heat release rate curves of fibers before and after TEOS flame retardant modification"

Fig.5

SEM images of carbon residues of fibers before and after TEOS flame retardant modification(×6 000)"

Fig.6

XPS pattern of fiber carbon residue before and after TEOS flame retardant modification"

Tab.2

Mechanical and hygroscopic properties of fibers before and after TEOS flame retardant modification"

样品 干断裂强度/
(cN·dtex-1)		 湿断裂强度/
(cN·dtex-1)		 干断裂
伸长率/%		 回潮率/
%
VF/DDPS 2.18 1.20 20.8 11.60
VF/DDPS/TEOS 2.09 1.06 17.1 10.95
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