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Flexible conductive polyurethane fiber and preparation method thereof

A polyurethane fiber, flexible and conductive technology, applied in fiber processing, fiber chemical characteristics, stretch spinning and other directions, can solve the problems of loss of conductivity, loss, conductive particles easily fall off conductivity, etc., to improve the degree of curl, cortex structure Stable, well-aligned effects

Active Publication Date: 2022-08-02
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current method of preparing conductive fibers is usually to blend and spin conductive particles and polyurethane resin or to grow conductive particles on the surface of polyurethane fibers to prepare conductive fibers. The conductive particles in the conductive fibers obtained by the former are easily completely wrapped by polyurethane resin to lose conductivity. The conductive particles in the conductive fibers obtained by the latter are easy to fall off, causing the loss of conductivity, which in turn affects the conductivity of the conductive sensing fabric.

Method used

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  • Flexible conductive polyurethane fiber and preparation method thereof
  • Flexible conductive polyurethane fiber and preparation method thereof
  • Flexible conductive polyurethane fiber and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0031] like figure 1 and figure 2 As shown, the present invention also provides a preparation method of the above-mentioned flexible conductive polyurethane fiber, comprising the following steps:

[0032] S1. Preparation of spinning dope:

[0033]Stir the polar solvent, and then add the polyurethane resin to the polar solvent according to the mass ratio of the polyurethane resin and the polar solvent as (20%-45%): (55%-80%), at 20-30 ° C mechanically Stirring for 100-140min, after the polyurethane resin is completely dissolved and the spinning solution is a homogeneous solution, the obtained solution is subjected to vacuum defoaming treatment at a temperature of 20-30°C to obtain a spinning solution.

[0034] Wherein, the polar solvent includes one or more of tetrahydrofuran, N,N, dimethylformamide, and N,N, dimethylacetamide.

[0035] S2. Preparation of flexible conductive polyurethane fibers:

[0036] (1) Preparation of two-dimensional flexible conductive polyurethane f...

Embodiment 1

[0048] A preparation method of flexible conductive polyurethane fiber, comprising the following steps:

[0049] S1. Preparation of spinning dope:

[0050] Stir the tetrahydrofuran, then add 30 g of the polyurethane resin to 70 g of the tetrahydrofuran solvent according to the mass ratio of the polyurethane resin and the tetrahydrofuran as 30%: 70%, and stir mechanically for 120 min at 25 ° C until the polyurethane resin is completely dissolved and the spinning solution is a homogeneous phase After the solution was obtained, the obtained solution was subjected to vacuum defoaming treatment at a temperature of 25 °C to obtain a spinning solution.

[0051] S2. Preparation of Flexible Conductive Polyurethane Fibers (2D):

[0052] Spinning was carried out by using a coaxial spinning nozzle, the nickel wire with a diameter of 10 μm was introduced into the core layer tunnel I, the spinning dope obtained in step S1 was loaded into the cortex tunnel II, and the nickel wire in the core...

Embodiment 2-5

[0055] A preparation method of flexible conductive polyurethane fiber, compared with Example 1, the difference is that in step S2, the drafting speed of the drafting axis a, the drafting axis b and the drafting axis c are different. Example 1 is roughly the same and will not be repeated here.

[0056] The preparation method of the flexible conductive polyurethane fibers (two-dimensional) prepared in Examples 1-5 was tested for performance. The results are shown in Table 1. The electrical conductivity refers to the electrical conductivity when the fiber is stretched by 1000%:

[0057] Table 1 Relevant properties of flexible conductive polyurethane fibers prepared in Examples 1-5

[0058]

[0059]

[0060] It can be seen from Table 1 that when the drafting speed of the drafting axis a and the drafting axis c is constant, as the drafting speed of the drafting axis b decreases (Examples 1, 2, 3, that is, as the drafting speed decreases With the increase of the ratio of draf...

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Abstract

The invention provides a flexible conductive polyurethane fiber and a preparation method thereof. The flexible conductive polyurethane fiber comprises a conductive core layer and an elastic skin layer, the conductive core layer is a metal fiber of a two-dimensional bending structure or a metal fiber of a three-dimensional spiral structure, and the elastic skin layer is a polyurethane fiber; the flexible conductive polyurethane fiber is obtained through coaxial spinning, and the diameter of the metal fiber is in a micron order. According to the preparation method, coaxial spinning, a drafting process and a twisting process are combined, the conductive fiber of a skin-core structure is prepared through coaxial spinning, a core layer of a two-dimensional bending structure with a certain bending angle and a special configuration or a core layer of a three-dimensional spiral structure with a special spatial configuration is generated by changing the drafting ratio and the twist degree, and the conductive fiber with the skin-core structure is obtained. And finally, the skin layer is thinned and rapidly solidified and formed through rapid drafting of a drafting shaft in a coagulating bath. The obtained conductive fiber has an electric signal which can be changed along with strain, and has extremely high elastic performance.

Description

technical field [0001] The invention relates to the technical field of flexible conductive fibers, in particular to a flexible conductive polyurethane fiber and a preparation method thereof. Background technique [0002] Conductive sensing fabrics are prepared by embedding or integrating conductive materials into elastic fabrics (spandex is widely used in elastic fabrics due to its excellent elastic properties). It has high elasticity and high flexibility similar to elastic fabrics. Therefore, conductive sensing fabrics can be widely used in the fields of sensors, anti-static and anti-electromagnetic radiation. [0003] The traditional method of preparing conductive sensing fabrics is to first weave fibers into spandex fabrics, and then connect the conductive devices to the spandex fabrics to obtain conductive sensing fabrics. Affects the electrical conductivity of the fabric. In addition, conductive fibers can also be prepared first, and then woven into conductive sensin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/22D01D5/00D01D5/12D01F8/16D01F8/18
CPCD01D5/22D01D5/00D01D5/12D01F8/16D01F8/18Y02P70/62
Inventor 夏良君张佳婧张春华宫钧耀刘欣徐卫林
Owner WUHAN TEXTILE UNIV
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