Electrochromic yarn and preparation method thereof

Abstract

The invention relates to an electrochromic yarn and a preparation method thereof. The preparation method of the electrochromic yarn comprises the following steps: 1, cleaning a fiber roving strip, andthen immersing the fiber roving strip in a dispersed aqueous solution of a carbon nanotube to obtain a carbon nanotube/fiber roving strip; 2, carrying out spinning by utilizing the carbon nanotube/fiber roving strip so as to obtain a carbon nanotube/fiber composite yarn; 3, winding white fibers on the surface of the carbon nanotube/fiber composite yarn so as to obtain a carbon nanotube wrapped yarn; and 4, coating thermochromic ink on the surface of the yarn and carrying out air cooling at a room temperature so as to obtain the electrochromic yarn. The preparation method is simple and low inpreparation cost, and is capable of reducing the electric resistance of the yarn to 300 omega/cm at the minimum; and the thermochromic ink is used for coating on the surface layer of the wrapped fibers, so that the change effect of the yarn can be changed through changing the type of the thermochromic ink. According to the preparation method, white color-changing yarns can be obtained, and the colors of the color-changing yarns are not affected by the natural colors of the yarns.

Description

technical field [0001] The invention relates to the field of color-changing yarns, in particular to an electrochromic yarn and a preparation method thereof. Background technique [0002] In recent years, smart wearable electronic devices have attracted more and more attention due to their ability to be in contact with human skin and diversification of functions. These wearable electronics can be used as tension and compression sensors, electronic skin, health monitoring and supercapacitors, etc. Due to their superior strength and flexibility, fiber materials have been widely used as base materials to prepare wearable textiles. As a kind of smart textiles, smart color-changing fibers and fabrics have also received more and more attention due to their wide application value in electronic display, military, protection, sensing and other fields. The traditional method is to prepare color-changing fibers with better color fastness through dyeing and finishing techniques. After ...

AI Technical Summary

Problems solved by technology

Fiber-based electrochromic materials have been reported so far. Reversible electrochromic fibers have been studied by using three conductive polymers and a double-electrode helical winding structure. However, adding steel wires to the fabric will affect the flexibility and flexibility of the final product. applicability

Graphene has also been used to functionalize elastic fibers to prepare stretchable electrochromic fibers, but its preparation process is complex and difficult to mass-produce

There are also studies on the deposition of polyaniline on carbon nanotube fibers to prepare electrochromic fibers, but due to the limitation of the color range of polyaniline, the fibers can only switch between blue, green and light yellow

It has also been reported that conductive polymers are deposited on one side of the fabric, and thermosensitive pigments are printed on the other side to realize the electrochromic function. Polymer durability is also a big concern

Coaxial multifilaments filled with polypyrrole and carbon nanotubes have been studied to realize electrochromic fabrics, however, due to poor electrical conductivity, high voltages are required to induce color changes, which may limit their use in wearable devices. Applications

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