Study on preparation, characterization and application of mixed-colorants thermochromic microcapsules--颗粒学报PARTICUOLOGY

Zhou, L., Ye, J., Cai, Q., Liu, G., Dadgar, M., Zhu, G., & Zhang, G. (2024). Study on preparation, characterization and application of mixed-colorants thermochromic microcapsules. Particuology, 88, 89-97. https://doi.org/10.1016/j.partic.2023.08.016

Study on preparation, characterization and application of mixed-colorants thermochromic microcapsules

Lan Zhou ^{a e}, Jingpeng Ye ^d, Qinze Cai ^a, Guojin Liu ^a, Mehran Dadgar ^c, Guocheng Zhu ^a, Guoqing Zhang ^{b *}

a College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, 310018, China
b School of Materials Science& Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, China
c Department of Textile, University of Neyshabur, Adib Boulevard, Khorasan Razavi Province, Iran
d Zhejiang Charming Dyeing and Finishing Co., Ltd, Jiaxing, 314500, China
e Zhejiang Provincial Innovation Center of Advanced Textile Technology, Shaoxing, 312000, China

10.1016/j.partic.2023.08.016

Volume 88, May 2024, Pages 89-97

Received 19 June 2023, Revised 9 August 2023, Accepted 22 August 2023, Available online 13 September 2023, Version of Record 6 November 2023.

E-mail: zgq@zstu.edu.cn

Highlights

• A novel mixed-colorant thermochromic microcapsules (MCTMs) were prepared with thermochromic and conventional dyes as core.

• The obtained MPCMs have high encapsulation efficiency, reliability and effective overheating protection capability.

• Printed cotton fabrics with MCTMs can change color reversibly between different tones with good reliability and durability.

Abstract

In order to expand the color-change range and make the discoloration temperature suitable for the daily textiles, a new formulation of mixed-colorants thermochromic core material is designed, in which crystal violet lactone (CVL) is the basic color former, bisphenol A (BPA) is the developer, especially the solvent-based dye and dodecyl dedecanoate are used as the extended dye and the solvent, respectively. Scanning electron microscope (SEM), differential scanning calorimeter (DSC) and thermogravimetric analyzer (TGA) were applied to study the morphology, encapsulation rate, non-isothermal crystallization behavior and thermal stability of the mixed-colorant thermochromic microcapsules (MCTMs) prepared by in-situ polymerization. The results show that MCTMs have good sphericity, uniform particle size, good thermal stability and the encapsulation rate can reach 86.73%. Under the non-isothermal conditions, the encapsulation of formaldehyde-melamine resin wall material can slightly reduce the crystallization rate of the solvent, but does not affect the relative crystallinity, thermal properties and discoloration sensitivity of the core materials. With the variety of ambient temperatures in the range of 20–35 °C, the printed cotton fabrics with MCTMs could change color reversibly between different tones with good reliability and durability, and exhibit more gorgeous colors than the common thermochromic materials.

Graphical abstract

Keywords

Thermochromic microcapsule; Color-change range; Phase-change material; Crystallization behavior

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