Journal of Textile Research ›› 2023, Vol. 44 ›› Issue (03): 60-66.doi: 10.13475/j.fzxb.20220803407

• Textile Engineering • Previous Articles     Next Articles

Preparation and UV stability of flame-retardant acrylic/aramid core-spun yarns

WU Junxiong1, WEI Xia1,2(), LUO Jingxian1, YAN Jiaoru1, WU Lei1,2   

  1. 1. School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    2. Key Laboratory of Functional Textile Material and Product, Xi'an Polytechnic University, Ministry of Education, Xi'an, Shaanxi 710048, China
  • Received:2022-08-15 Revised:2022-12-21 Online:2023-03-15 Published:2023-04-14

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Abstract:

Objective Aramid fiber has become the most widely used high performance fiber for protective fabrics because of its good flame retardancy and chemical stability. But, due to the penetration of the molecular chain contains a lot of chromogenic groups, it is prone to aging degradation under high-energy rays, especially UV light, and the UV aging performance seriously affected usability of the aramid products used outdoors. Therefore, it is necessary to study how to improve the UV aging resistance of aramid fiber in fabrics.

Method Aiming at the problem of poor UV light stability and easy photodegradation and aging of aramid, the core-spun yarn structure was adopted to block the direct UV irradiation of aramid by covering the aramid core with flame-retardant acrylic fibers. Five core-spun yarns were designed, including aramid/aramid, flame-retardant acrylic/aramid, modacrylic/aramid, flame-retardant acrylic/flame-retardant viscose/aramid and flame-retardant acrylic/flame-retardant Modal/aramid. The core-spun yarns were used as weft and aramid as warp to weave fabrics, and the UV aging, comfort and flame retardant properties were tested.

Results Compared with pure aramid fabric, the UV protection coefficient of flame-retardant acrylic/aramid fabric, flame-retardant acrylic/flame-retardant viscose/aramid fabric and flame-retardant acrylic/flame-retardant Modal/aramid fabric increased by 25.8%, 18.7% and 20.8%, respectively(Fig.4), while the fracture strength decreased by 23.1%, 37.9% and 27.0%, respectively(Fig.1). The continuous combustion time was prolonged by 0.9 s, 0.2 s and 0.2 s respectively, and the smoldering time was prolonged by 0.3 s, 0.4 s and 0.7 s respectively. The fracture strengths of pure aramid yarn, flame-retardant acrylic/aramid yarn, flame-retardant acrylic/flame-retardant viscose/aramid yarn and flame-retardant acrylic/flame-retardant Modal/aramid yarn decreased by 43.6%, 5.9%, 8.3% and 9.1%, respectively(Fig.2). The comfort of flame-retardant acrylic/aramid fabric decreases, but the comfort of flame-retardant acrylic/flame-retardant viscose/aramid fabric increases.

Conclusion Before UV aging, the breaking strength of pure aramid fabric is the largest, and the breaking strength of nitrile and chloroprene fabric is the smallest. After 18 months of UV-accelerated aging, the breaking strength of the fabrics with flame-retardant acrylic fibers decreases, but that with flame-retardant acrylic fibers decreases the most, and that with flame-retardant acrylic fibers/aramid fibers decreases the least.The UV transmittance of flame-retardant acrylic/aramid fabric is the lowest, and the UV transmittance of pure aramid fabric is the highest. Flame-retardant acrylic/aramid fiber has the best UV protection performance, while pure aramid fiber has the worst. The yarn component contains flame-retardant acrylic fiber, which can effectively improve the UV resistance of the fabric, and the greater the yarn density in the same fabric, the lower the UV transmittance of the fabric. Flame-retardant acrylic/flame-retardant viscose/aramid core yarn has the best comprehensive performance, good UV stability, comfortability and flame retardant.

Key words: aramid fiber, flame-retardant acrylic fiber, core-spun yarn, UV light stability, comfortability, flame retardancy

CLC Number: 

  • TS106.4

Tab.1

Basic parameters of core-spun yarns"

包芯纱
分类号		 纱线
线密度/
tex		 捻
系
数		 单层 双层
捻度 捻向 牵伸
倍数		 捻度 捻向 牵伸
倍数
1 26 320 627 Z 36.4 672 Z 51.9
627 S 121.2
2 38 320 519 Z 17.4 574 Z 24.8
519 S 58.0
3 55 320 431 Z 10.0 488 Z 14.3
431 S 33.3

Tab.2

Types and number of yarns"

纱线
编号		 纱线类型 线密度/
tex		 芯比率/
%		 中层比
率/%		 外层比
率/%
F1 纯芳纶/芳纶 26 56.9 — 43.1
F2 纯芳纶/芳纶 38 38.9 — 61.1
F3 纯芳纶/芳纶 55 26.9 — 73.1
J1 阻燃腈纶/芳纶 26 56.9 — 43.1
J2 阻燃腈纶/芳纶 38 38.9 — 61.1
J3 阻燃腈纶/芳纶 55 26.9 — 73.1
L1 腈氯纶/芳纶 26 56.9 — 43.1
L2 腈氯纶/芳纶 38 38.9 — 61.1
JN1 阻燃腈纶/阻燃粘胶/芳纶 26 56.9 12.9 30.2
JN2 阻燃腈纶/阻燃粘胶/芳纶 38 38.9 18.3 42.8
JN3 阻燃腈纶/阻燃粘胶/芳纶 55 26.9 21.9 51.2
JM1 阻燃腈纶/阻燃莫代尔/芳纶 26 56.9 12.9 30.2
JM2 阻燃腈纶/阻燃莫代尔/芳纶 38 38.9 18.3 42.8
JM3 阻燃腈纶/阻燃莫代尔/芳纶 55 26.9 21.9 51.2

Tab.3

Basic parameters of fabrics"

织物
规格		 纱线线密度 密度/
(根·(10 cm)-1)		 面密度/
(g·m-2)		 紧度/
%
经纱 纬纱 经向 纬向
规格1 14.8 tex×2 26 tex 256 140 114.7 68.3
规格2 14.8 tex×2 38 tex 256 140 131.5 70.8
规格3 14.8 tex×2 55 tex 256 140 155.3 74.1

Fig.1

Breaking strength of fabrics"

Fig.2

Comparison of fabrics strength before and after aging"

Fig.3

Ultraviolet spectra of fabrics"

Fig.4

UV protection factors of fabrics"

Tab.4

Flame retardancy of fabrics"

织物编号 续燃时间/s 阴燃时间/s 损毁长度/mm 燃烧状态
ZF2 0.0 0.0 20 炭化、收缩
ZJ1 1.2 0.4 63 炭化
ZJ2 0.9 0.3 58 炭化
ZJ3 0.8 0.3 50 炭化
ZL2 0.4 0.9 49 炭化
ZJN2 0.2 0.4 39 炭化
ZJM2 0.2 0.7 54 炭化

Tab.5

Comfort properties of fabrics"

织物种类 回潮率/% 透气率/(mm·s-1) 透湿率/(g·m-2·d-1) 芯吸高度/mm 保暖率/% 抗弯刚度/(mN·cm)
纯芳纶 5.80 1 054.8 2 596.29 132.5 36.42 1.359
阻燃腈纶/芳纶 4.28 960.9 3 824.34 110.0 34.96 1.148
腈氯纶/芳纶 4.76 937.7 3 533.55 117.0 36.13 1.055
阻燃腈纶/阻燃粘胶/芳纶 5.25 1 156.1 4 058.00 136.5 39.37 1.619
阻燃腈纶/阻燃莫代尔/芳纶 5.17 1 090.7 4 013.86 128.5 38.68 1.788
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