Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (11): 109-115.doi: 10.13475/j.fzxb.20200202607

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Halogen-free flame retardant finishing of ultra-high molecular weight polyethylene fiber

YANG Yaru1,2(), SHEN Xiaojun1,2, TANG Bolin1,2, NIU Mei3   

  1. 1. College of Materials and Textile Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, China
    2. Key Laboratory of Yarn Materials Forming and Composite Processing Technology of Zhejiang Province, Jiaxing University, Jiaxing, Zhejiang 314001, China
    3. College of Textile Engineering, Taiyuan University of Technology, Jinzhong, Shanxi 030600, China
  • Received:2020-02-13 Revised:2020-07-11 Online:2020-11-15 Published:2020-11-26

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Abstract:

In order to improve the flame retardant properties of ultra-high molecular weight polyethylene (UHMWPE) fiber, carbon microspheres coated by magnesium hydroxide (MH-CMSs), which have both flame retardant and smoke suppression effect, were used as flame retardants, and tetrabutyl titanate and triphenyl phosphite were used as surfactants. The UHMWPE fibers were modified using the procedure of impurity removal—activation—padding—baking. The flame retardant properties, mechanical properties and thermal stability of these fibers were tested, and the flame retardant mechanism was studied. The research results show that this method is able to improve effectively the flame retardancy of UHMWPE fiber without harming its mechanical properties. Compared with pure UHMWPE fiber, the limited oxygen index of flame retardant UHMWPE (FR-UHMWPE) fiber is increased more than 36%, the peak heat release rate is reduced by up to 39.3%. In addition, smoke and molten droplets of the UHMWPE fibers are suppressed, and the fire risk is significantly reduced. The FR-UHMWPE fiber exhibits condensed phase flame retardant mechanism. The flame retardant finishing promotes the degradation of UHMWPE into carbon, which forms a dense and continuous char layer during the combustion process. This char layer can effectively prevent the transfer of heat and mass, and thus has a flame retardant effect.

Key words: high-performance fiber, ultra-high molecular weight polyethylene, flame retardant finishing, halogen-free flame retardant, flame retardant mechanism

CLC Number: 

  • TH145.23

Fig.1

TEM image (a) and FT-IR spectra (b) of MH-CMSs flame retardant"

Fig.2

TG curve of MH-CMSs flame retardant"

Fig.3

SEM images of UHMWPE fibers before and after flame retardant treatment. (a) Pure UHMWPE fiber;(b)1# FR-UHMWPE fiber; (c) 2# FR-UHMWPE fiber;(d)3# FR-UHMWPE fiber"

Fig.4

Infrared spectra of UHMWPE fibers before and after flame retardant treatment"

Tab.1

Burning performance of FR-UHMWPE fibers"

样品 质量
增加率/%		 LOI值/
%		 续燃时间/
s		 融滴数
纯UHMWPE纤维 — 17.5 燃尽 16
1# FR-UHMWPE纤维 9.5 23.8 10 12
2# FR-UHMWPE纤维 15.6 24.6 6 5
3# FR-UHMWPE纤维 21.4 24.1 5 3

Fig.5

Heat release rate curves of FR-UHMWPE fibers"

Tab.2

Cone calorimeter test data of FR-UHMWPE fibers"

样品 TTI/s pk-HRR/
(kW·m-2)		 THR/
(MJ·m2)		 TSR/
m3		 TTI/
pk-HRR
纯UHMWPE纤维 3 169.7 24.9 204.1 0.018
1#FR-UHMWPE纤维 13 168.3 23.2 110.8 0.077
2#FR-UHMWPE纤维 17 119.1 17.7 99.1 0.143
3#FR-UHMWPE纤维 15 102.9 19.4 127.4 0.146

Tab.3

Mechanical properties of FR-UHMWPE fibers"

样品 断裂强度/
(cN·dtex-1)		 断裂强力/
N		 断裂伸长率/
%
纯UHMWPE纤维 33.0 350 3.0
1# FR-UHMWPE纤维 34.1 355 2.5
2# FR-UHMWPE纤维 35.8 370 2.2
3# FR-UHMWPE纤维 38.5 383 2.1

Fig.6

TG curves of UHMWPE fiber and FR-UHMWPE fiber"

Fig.7

SEM images of char layers of UHMWPE fiber (a) and FR-UHMWPE fiber (b)"

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