Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (07): 85-89.doi: 10.13475/j.fzxb.20180708406

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Synthesis of self-colored waterborne polyurethane and its application in coating of cotton fabric

XU Yan, JI Xiaoqian, CHEN Kunlin, WANG Chaoxia   

  1. College of Textiles and Clothing, Jiangnan University, Wuxi, Jiangsu 214122, China
  • Received:2018-07-30 Revised:2019-04-17 Online:2019-07-15 Published:2019-07-25
  • Contact: WANG Chaoxia

Abstract:

Hydroxyl terminated self-colored waterborne polyurethane was synthesized by covalently bonding 1-amino-4-hydroxy-2-(6-hydroxy-hexyloxy) anthraquinone into waterborne polyurethane skeleton to solve the poor thermal migration of low molecular dye and complexity of pigment, dye or extra colorant for coating slurry. The chemical structure and thermal stability were studied by Fourier transform infrared spectrometer, ultraviolate-visible spectrometer and thermal gravity analysis. The effects of chromophore mass fraction, curing agent mass fraction and baking conditions on K/S value, color fastness and hand feeling were investigated. Results show that the K/S value of coated cotton fabric increases with the increase of anthraquinone chromophore dosages in the preparation of self-colored waterborne polyurethane. The K/S value of coated cotton fabric is 5.20 under the condition of 20% curing agent and baking at 150 ℃ for 5 min. The dry rubbing fastness and wet rubbing fastness are 4-5 grade. The fading fastness can reach 3-4 grade and staining fastness is 4-5 grade. The hand feeling is 3 grade.

Key words: waterborne polyurethane, chromophore, coating, curing agent, self-color, cotton fabric

CLC Number: 

  • TS195.597

Fig.1

FT-IR spectrum of self-colored waterborne polyurethane"

Fig.2

UV-vis spectrum of self-colored waterborne polyurethane"

Fig.3

Thermal stability of self-colored waterborne polyurethane"

Tab.1

Influence of chromophore mass fraction on color parameters of coated fabrics"

涂层织物 K/S L* a* b* C* h°
PU1 0.70 76.59 34.05 5.48 34.49 9.15
PU2 2.66 62.36 49.18 9.12 50.01 10.51
PU3 4.13 58.00 54.77 11.52 55.96 11.87
PU4 4.56 55.39 53.51 10.26 54.48 10.85

Tab.2

Color fastness and hand feeling of coated fabrics with different chromophore mass fraction"

涂层
织物
摩擦牢度/级 皂洗牢度/级 手感/级
湿 棉沾色 褪色
PU1 4~5 4~5 4~5 2 3
PU2 4~5 4~5 4~5 2~3 3
PU3 4~5 4 4~5 3 3
PU4 4~5 4 4~5 3 3

Fig.4

Influence of curing agent mass fraction on K/S value of coated fabrics"

Tab.3

Influence of curing agent mass fraction on color fastness and hand feeling of coated fabric"

固化剂
质量分数/%
摩擦牢度/级 皂洗牢度/级 手感/级
湿 棉沾色 褪色
0 4~5 2~3 4~5 1 4
5 4~5 3 4~5 2 4
10 4~5 4 4~5 3 3
15 4~5 4~5 4~5 3 3
20 4~5 4~5 4~5 3~4 3

Fig.5

Surface morphologies of fabrics (×1 000). (a) Uncoated fabric; (b) Coated fabric; (c) Coated fabric after rubbing; (d) Coated fabric after soaping"

Tab.4

Influence of baking conditions on color fastness and hand feeling of coated fabric"

焙烘条件 K/S 摩擦牢度/级 皂洗牢度/级 手感/
温度/
时间/
min
湿 棉沾色 褪色
130 3 5.49 4~5 2~3 4~5 1 3
130 5 5.25 4~5 3 4~5 1 3
150 3 5.29 4~5 4 4~5 2 3
150 5 5.20 4~5 4~5 4~5 3~4 3
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