Light-resistant thermochromic fabric and preparation method thereof

A temperature-induced discoloration and fabric technology, applied in the field of material science, can solve the problems of poor light fatigue resistance, high technical requirements, and fading of microcapsules, and achieve the effect of good ultraviolet absorption performance, broad application prospects, and slow color fading

Active Publication Date: 2022-07-29
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The color-changing microcapsules prepared by the above-mentioned patents all have good color-changing response and reversible discoloration performance, but this kind of color-changing microcapsules have poor light fatigue resistance, especially when they are used outdoors, the microcapsules will fade obviously in a short time Phenomenon
The main reason is that the structure of fluoran dyes is not stable enough, and they will gradually lose their color changing ability under the action of light and heat.
All in all, the color-changing system using fluoran dye as the chromogenic agent cannot meet people's use requirements in terms of sun resistance
[0005] At present, the method to improve the light fastness of fluoran dyes is mainly to improve its UV protection performance, for example: grafting groups with UV absorbing functions on the color-changing dyes, but this method requires high technical requirements and is expensive; The method of finishing color-changing textiles with UV absorbers, but commercial UV absorbers are mostly small molecule materials, which have the problem of outward migration during use, which greatly affects the protection life

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Light-resistant thermochromic fabric and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for preparing light-resistant thermochromic fabric, comprising the steps of:

[0043] (1) Preparation of UV-absorbing polymers:

[0044] 24.924g methyl methacrylate and 1.876g 2-[3-(2H-benzotriazol-2-yl)-4-hydroxyphenyl]ethyl 2-methacrylate (the mass ratio of the two is 93 : 7) Dissolved in 40 g of toluene, and slowly added dropwise 0.32 g of benzoyl peroxide, then heated to 80 ° C, and reacted for 5 h, after the reaction was completed, the product was extracted with methanol, and dried to obtain a UV-absorbing polymer;

[0045] (2) Preparation of thermochromic fabric:

[0046] Mix 10g of blue thermochromic dye (fluoran dye, the discoloration temperature is 30°C), 15g of printing adhesive DM-5128, 22g of water and 3g of thickener DM-5221G, and then stir until viscous to obtain a printing paste; Evenly apply 8g printing paste to 100cm 2On cotton fabrics, thermochromic fabrics were obtained after baking at 120°C for 10 minutes;

[0047] (3) Preparation of lig...

Embodiment 2

[0050] Adjust 2-[3-(2H-benzotriazol-2-yl)-4-hydroxyphenyl]ethyl 2-methacrylate in step (1) of Example 1 to 2-hydroxy-4-allyl Oxybenzophenone; adjust the blue thermochromic dye in step (2) of Example 1 to be a red thermochromic dye (fluoran dye, the discoloration temperature is 30°C), and the others are consistent with those in Example 1, to obtain the lightfast thermochromic fabric.

Embodiment 3

[0052] Adjust 2-[3-(2H-benzotriazol-2-yl)-4-hydroxyphenyl]ethyl 2-methacrylate in step (1) of Example 1 to 2-hydroxy-4-propene base benzophenone; others are the same as those in Example 1, and the light-resistant thermochromic fabric is obtained.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention discloses a light-resistant thermochromic fabric and a preparation method thereof, and belongs to the technical field of material science. The method for preparing the light-resistant thermochromic fabric comprises the following steps: (1) dissolving an ultraviolet absorption monomer and a structural monomer in a solvent, and uniformly mixing; heating to 60-85 DEG C, dropwise adding an initiator, keeping the reaction temperature to react for 3-12 hours, and after the reaction is finished, extracting and drying to obtain an ultraviolet absorption polymer; (2) preparing an ultraviolet absorption polymer into an ultraviolet absorption polymer solution; and then coating the ultraviolet absorption polymer solution on the surface of the thermochromic fabric, and drying to obtain the light-resistant thermochromic fabric. The light-resistant thermochromic fabric disclosed by the invention is slow in color fading, good in color retention and high in crockfastness under illumination, can meet the use requirements of people on the color-changing fabric, and has a wide application prospect in the field of outdoor color-changing textiles.

Description

technical field [0001] The invention relates to a light-resistant thermochromic fabric and a preparation method thereof, belonging to the technical field of material science. Background technique [0002] Thermochromic dyes are materials that can change color in response to ambient temperature, and can achieve the purpose of transforming microscopic temperature into macroscopic color changes. At present, thermochromic dyes have broad application prospects in the fields of textiles, intelligent buildings, anti-counterfeiting packaging, intelligent medical care, and military industry. [0003] There are many types of thermochromic dyes. According to the composition of the material, they can be divided into inorganic, organic and liquid crystal types. Inorganic thermochromic materials have low cost, but have a narrow discoloration range, high discoloration temperature and low precision. Limitations; liquid crystals have good thermal discoloration and light resistance stability...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/04D06N3/00D06P1/00D06P3/60C08F220/14C08F220/36
CPCD06N3/042D06N3/0059D06N3/0088D06N3/0077D06P1/00D06P3/60C08F220/14C08F220/36
Inventor 张丽平钟子恒付少海王春霞王婧雯
Owner JIANGNAN UNIV
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