Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (09): 137-142.doi: 10.13475/j.fzxb.20210507506

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Printing and photochromic properties of spiropyran microcapsules on cotton fabrics

YANG Mengfan, WANG Chaoxia(), YIN Yunjie, QIU Hua   

  1. Key Laboratory of Eco-Textiles(Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
  • Received:2021-05-26 Revised:2022-06-20 Online:2022-09-15 Published:2022-09-26
  • Contact: WANG Chaoxia E-mail:wchaoxia@sohu.com

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Abstract:

In order to obtain a photochromic textile for detecting ultraviolet(UV) intensity, microcapsules with spiropyran photochromic material as core material and polymethylmethacrylate as wall material were prepared by solvent volatilization method for printing cotton fabrics. The particle size, surface topography, core encapsulation efficiency and photochromic properties of the prepared microcapsules were characterized. A self-made color gradation chart was used to record the photochromic color difference of the photochromic textile. The effects of UV irradiation conditions on the photochromic properties and printing process on the rubbing color fastness of cotton fabrics were investigated. The results showed that the average particle size of spiropyran microcapsules was 729 nm, and the polydispersity index was 0.34. In a certain range, the photochromic color difference increased with the increase of microcapsule dosage, UV irradiation time and UV intensity. The color difference of printed fabric with 14% microcapsule content can reach 19.02 after UV irradiation at 30 W/m2 for 100 s, and the color fastness to dry rubbing of the printed fabric can reach grade 4-5 and the color fastness to wet rubbing can reach grade 4. The photochromic performance lost 12.26% after 20 UV-Vis cycles.

Key words: spiropyran, microcapsule, photochromic, intelligent textile, printing, ultraviolet detection

CLC Number: 

  • TS194.2

Tab.1

Colorimetric values of color gradation chart"

L* a* b* ΔE
85.00 17.00 7.00 22.38
85.74 16.16 6.63 21.21
86.47 15.32 6.26 20.03
87.21 14.47 5.90 18.85
87.95 13.63 5.53 17.67
88.69 12.79 5.16 16.49
89.42 11.95 4.79 15.32
90.16 11.11 4.42 14.14
90.90 10.26 4.06 12.96
91.63 9.42 3.69 11.78
92.37 8.58 3.32 10.60
93.11 7.74 2.95 9.43
93.84 6.90 2.58 8.25
94.58 6.05 2.22 7.07
95.32 5.21 1.85 5.89
96.05 4.37 1.48 4.71
96.79 3.53 1.11 3.54
97.53 2.69 0.74 2.36
98.27 1.84 0.38 1.18
99.00 1.00 0.00 0.00

Fig.1

Particle size distribution of spiropyran microcapsules"

Fig.2

SEM images of spiropyran microcapsules at different magnification"

Fig.3

Photos of spiropyran and its microcapsules powder before and after UV irradiation"

Fig.4

Wavelength absorbance curves of spiropyran octane solution (a) and microcapsule aqueous dispersion (b) before and after UV irradiation"

Fig.5

Structure of spiropyran before and after UV irradiation"

Fig.6

Thermogravimetric curves of microcapsules, spiropyran and polymethylmethacrylate"

Fig.7

Effects of microcapsule mass fraction and UV irradiation time on photochromic ΔE of printed fabrics"

Fig.8

Effects of microcapsule mass fraction and UV intensity on photochromic ΔE of printed fabrics"

Fig.9

Effect of UV-vis irradiation cyclics on photochromic ΔE of printed fabrics"

Tab.2

Effect of binder mass fraction on color fastness to rubbing of printed fabrics"

黏合剂质量分数/% 耐干摩擦色牢度/级 耐湿摩擦色牢度/级
12 4 2
14 4 2~3
16 4 4
18 4~5 4
20 4 2~3
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