CN108893818B - A kind of flexible conductive yarn and preparation method thereof - Google Patents

Abstract

The invention relates to a flexible conductive yarn and a preparation method thereof. The conductive yarn utilizes the internal and external transfer mechanism of the blended yarn to construct a three-layer concentric sheath-core structure. The outer layer is wrapped by polyester staple fibers, which has good electrical insulation and mechanical properties, which can effectively protect the core layer and isolate the current; the core layer is composed of a continuous regenerated cellulose fiber-based conductive medium, which has good electrical conductivity; The middle layer is composed of heat-shrinked acrylic fiber, which effectively stabilizes the yarn structure and isolates the conductive medium that protects the core layer. The three-layer concentric sheath-core structure is constructed by using the internal and external transfer mechanism of the blended yarn, so that the conductive yarn has excellent flexibility, stable structure and can be washed with water.

Description

A kind of flexible conductive yarn and preparation method thereof

technical field

The invention relates to the technical field of flexible wearable electronic devices, in particular to a flexible conductive yarn and a preparation method thereof.

Background technique

With the continuous improvement of human living standards, people have put forward higher requirements for their use of materials, such as clothing. The traditional functions are mainly covering, protecting, beautiful, marking, etc. People prefer that the clothing they wear has communication, human body Information detection, electromagnetic wave shielding and other functions, then the proposal of these requirements forces a reasonable structure of the current transmission medium to meet the flexible characteristics of clothing, that is to say, the conductive components of clothing need to be soft and conductive, which are generally realized by conductive yarns.

At present, conductive yarns are mostly constructed in two forms: one is a composite structural yarn with an outer layer of textile fibers and an inner layer of conductive materials; the other is a conductive medium coated on the outer layer of the yarn. The latter requires a scientific design of the fabric structure to meet the electrical insulation requirements of human contact clothing, and its application is limited. However, the flexibility, washability and durability of the conductive yarns in both structures need to be further improved.

SUMMARY OF THE INVENTION

The present invention proposes a flexible conductive yarn and a preparation method thereof, and realizes the key technologies of flexibility, durability and washability of the conductive yarn.

The technical scheme for realizing the present invention is as follows: a flexible conductive yarn, the flexible conductive yarn has a three-layer concentric sheath-core structure, the outer layer is wrapped by polyester staple fibers, and the core layer is composed of continuous cation-treated regenerated cellulose fibers. It is composed of conductive medium, and the middle layer is composed of acrylic fiber after heat shrinkage.

Regenerated cellulose fibers are cationically treated with chitosan, DMAC or polyamide epichlorohydrin resins.

The preparation method of the described flexible conductive yarn, the steps are as follows:

(1) Cationic treatment: The regenerated cellulose fibers are placed in a cationic modifier solution for treatment;

(2) Blended spinning: The cation-treated regenerated cellulose fibers, acrylic fibers (bulked yarns), and polyester staple fibers are mixed and spun into multi-component yarns, and the regenerated cellulose fibers are placed in the core layer of the multi-component yarns. Acrylic fibers are in the middle layer, and polyester staple fibers are distributed in the outer layer;

(3) Conductive medium self-assembly treatment: The multi-component yarn is repeatedly immersed in the conductive medium dispersion for self-assembly treatment;

(4) Bulking treatment: performing wet heat treatment on the yarn after the self-assembly treatment of the conductive medium in step (3) to obtain a flexible conductive yarn.

In the step (1), the regenerated cellulose fibers are placed in a solution of a cationic modifier, the concentration of the cationic modifier solution is 0.5-1%, the temperature is 50-80 ° C, the treatment is 30-60min, and the drying is performed after washing. .

In the step (2), the length of the regenerated cellulose fiber is 46-49mm, the fineness is 0.9-1.0D, the length of the acrylic fiber is 40-43mm, and the fineness is 1.2-1.3D; the length of the polyester staple fiber is 34-37mm, and the fineness is 34-37mm. Degree is 1.5-1.6D. According to the radial distribution law of the blended yarn, the finer the fiber, the longer the length, the higher the probability of distribution in the core layer of the yarn. Therefore, the regenerated cellulose fiber in the multi-component yarn will be more distributed in the yarn. The core layer, the acrylic fiber is in the middle, and the polyester fiber is distributed in the outer layer, thereby forming a multi-component yarn with a three-layer concentric sheath-core structure

The multi-component three-layer concentric sheath-core structure yarn spun in step (2) is immersed in a dispersion liquid composed of a conductive medium. Since the conductive medium in the dispersion liquid is anionic, under electrostatic induction, the medium can automatically Assembled on the surface layer of viscose fibers after cationic treatment to form a conductive matrix.

In the step (3), the conductive medium dispersion is one of anionic carbon nanotubes, anionic graphene and anionic graphene oxide dispersions, the concentration of the dispersion is 0.5-3%, and the temperature is 20-30°C , treated for 30-60min, washed with water and air-dried at room temperature.

In the step (4), the temperature of the moist heat treatment is 130-150° C., the relative humidity is 90%, and the treatment time is 10-15 minutes. Using the mechanism of thermal shrinkage of acrylic fiber, heating the acrylic fiber shrinks and drives the surrounding fibers to move, so that the polyester fiber on the surface of the yarn is bulky, and the viscose-based conductive medium in the inner layer is more tightly packed, which is more conducive to the flexibility of the conductive yarn , structure and performance stability.

In the step (2), the blending ratio of regenerated cellulose fibers, acrylic fibers, and polyester staple fibers is 40:10:50.

The beneficial effect of the present invention is that the conductive yarn of the present invention utilizes the internal and external transfer mechanism of the blended yarn to construct a three-layer concentric sheath-core structure. The outer layer is wrapped by polyester staple fibers, which has good electrical insulation and mechanical properties, which can effectively protect the core layer and isolate the current; the core layer is composed of a continuous regenerated cellulose fiber-based graphene oxide conductive medium, which has good performance. Electrical conductivity; the middle layer is composed of heat-shrinked acrylic fiber, which effectively stabilizes the yarn structure and isolates the conductive medium that protects the core layer. The conductive yarn with three-layer concentric sheath-core structure has excellent flexibility and stable electrical properties. The invention is a preparation method of flexible conductive yarn, which utilizes the internal and external transfer mechanism of blended yarn to construct a three-layer concentric sheath-core structure, so that the conductive yarn has excellent flexibility, stable structure and can be washed with water.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts.

FIG. 1 is a schematic diagram of the preparation process of the flexible conductive yarn of the present invention.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

The preparation method of flexible conductive yarn, the steps are as follows:

The viscose fiber with a length of 48mm and a fineness of 0.9D was placed in a solution composed of a cationic modifier with a concentration of 0.5% and a temperature of 50°C for 30min. 1.2D acrylic fiber and 34mm long polyester fiber with a fineness of 1.5D are mixed in the drawing process in a blending ratio of 40/10/50, and the multi-component of the three-layer concentric sheath-core structure is obtained through the roving and spinning process. spun yarn. Then the multi-component spun fiber yarn is placed in the conductive medium dispersion liquid of anionic carbon nanotubes, the concentration of the dispersion liquid is 0.5%, the temperature is 20 ° C, the treatment is 30 min, washed with water and dried at room temperature, and the treatment is repeated five times The process prepares the conductive yarn. The conductive yarn was placed at a temperature of 130°C, a relative humidity of 90%, and a treatment time of 10 minutes to obtain a three-layer concentric sheath-core conductive yarn with excellent flexibility and stable electrical properties.

Example 2

The preparation method of flexible conductive yarn, the steps are as follows:

(1) Cationic treatment: The regenerated cellulose fibers with a length of 46mm and a fineness of 0.9D are placed in a chitosan solution for treatment with a concentration of 0.5% and a temperature of 50°C for 60min, washed with water and then dried;

(2) Blending: The cation-treated regenerated cellulose fibers, 40mm in length, 1.2D fineness of fermented bean curd acrylic fiber (bulked yarn), 34mm in length, and 1.5D in polyester staple fibers are mixed and woven into many Component yarn, regenerated cellulose fibers are placed in the core layer of multi-component yarns, acrylic fibers are in the middle layer, and polyester staple fibers are distributed in the outer layer; the blending ratio of regenerated cellulose fibers, acrylic fibers, and polyester staple fibers is 40:10 :50;

(3) Conductive medium self-assembly treatment: The multi-component yarn is repeatedly immersed in an anionic carbon nanotube dispersion solution for self-assembly treatment. The concentration of the dispersion solution is 0.5%, the temperature is 20 °C, and the treatment is 60 min. After washing, the room temperature to dry;

(4) Bulking treatment: perform wet heat treatment on the yarn after the self-assembly of the conductive medium in step (3), the temperature of the wet heat treatment is 130° C., the relative humidity is 90%, and the treatment time is 15 minutes to obtain a flexible conductive yarn.

Example 3

The preparation method of flexible conductive yarn, the steps are as follows:

(1) Cationic treatment: The regenerated cellulose fibers with a length of 48mm and a fineness of 0.95D are placed in a DMAC solution for treatment with a concentration of 0.8% and a temperature of 70°C for 50min, washed with water and then dried;

(2) Blending: The cation-treated regenerated cellulose fibers, 42mm in length, 1.25D fineness of fermented bean curd acrylic fiber (bulked yarn), 35mm in length, and 1.55D polyester staple fibers are mixed and woven into a Component yarn, regenerated cellulose fibers are placed in the core layer of multi-component yarns, acrylic fibers are in the middle layer, and polyester staple fibers are distributed in the outer layer; the blending ratio of regenerated cellulose fibers, acrylic fibers, and polyester staple fibers is 40:10 :50;

(3) Conductive medium self-assembly treatment: The multi-component yarn is repeatedly dipped in an anionic graphene dispersion solution for self-assembly treatment. The concentration of the dispersion solution is 2%, the temperature is 25°C, and the treatment is 50min. After washing with water, air at room temperature. Dry;

(4) Bulking treatment: perform wet heat treatment on the yarn after the self-assembly treatment of the conductive medium in step (3), the temperature of the wet heat treatment is 140° C., the relative humidity is 90%, and the treatment time is 13 minutes to obtain a flexible conductive yarn.

Example 4

The preparation method of flexible conductive yarn, the steps are as follows:

(1) Cationic treatment: The regenerated cellulose fibers with a length of 49mm and a fineness of 1.0D are placed in a PAE solution for treatment with a concentration of 1% and a temperature of 80°C for 30min, washed with water and then dried;

(2) Blended spinning: The cation-treated regenerated cellulose fibers, 43mm in length, 1.3D fineness of fermented bean curd acrylic fiber (bulked yarn), 37mm in length, and 1.6D in polyester staple fibers are mixed and woven into many Component yarn, regenerated cellulose fibers are placed in the core layer of multi-component yarns, acrylic fibers are in the middle layer, and polyester staple fibers are distributed in the outer layer; the blending ratio of regenerated cellulose fibers, acrylic fibers, and polyester staple fibers is 40:10 :50;

(3) Conductive medium self-assembly treatment: The multi-component yarn is repeatedly immersed in an anionic graphene oxide dispersion solution for self-assembly treatment. The concentration of the dispersion solution is 3%, the temperature is 30 °C, and the treatment is 30min. After washing, the room temperature to dry;

(4) Bulking treatment: perform wet heat treatment on the yarn after the self-assembly treatment of the conductive medium in step (3), the temperature of the wet heat treatment is 150° C., the relative humidity is 90%, and the treatment time is 10 min to obtain a flexible conductive yarn.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (6)

1. A flexible conductive yarn characterized by: the flexible conductive yarn is of a three-layer concentric sheath-core structure, the outer layer is wrapped by polyester staple fibers, the core layer is formed by continuous regenerated cellulose fiber base conductive media subjected to cation treatment, and the middle layer is formed by acrylic fibers subjected to thermal shrinkage;

the preparation method of the flexible conductive yarn comprises the following steps:

(1) cation treatment: placing the regenerated cellulose fiber in a cation modifier solution for treatment;

(2) blending: mixing and spinning the regenerated cellulose fiber, acrylic fiber and polyester staple fiber which are subjected to cation treatment into multi-component yarns, wherein the regenerated cellulose fiber is arranged in a multi-component yarn core layer, the acrylic fiber is arranged in a middle layer, and the polyester staple fiber is distributed on an outer layer;

wherein the length of the regenerated cellulose fiber is 46-49mm, the fineness is 0.9-1.0D, the length of the acrylic fiber is 40-43mm, and the fineness is 1.2-1.3D; the length of the polyester staple fiber is 34-37mm, and the fineness is 1.5-1.6D;

(3) conducting medium self-assembly treatment: repeatedly dipping the multi-component yarn into the conductive medium dispersion liquid for self-assembly treatment;

(4) and (3) bulking treatment: and (4) carrying out damp-heat treatment on the yarn subjected to the self-assembly treatment of the conductive medium in the step (3) to obtain the flexible conductive yarn.

2. The flexible conductive yarn of claim 1, wherein: the regenerated cellulose fiber is treated by chitosan, DMAC or polyamide epichlorohydrin resin cation.

3. The flexible conductive yarn of claim 1, wherein: in the step (1), the regenerated cellulose fiber is placed in a cation modifier solution, the concentration of the cation modifier solution is 0.5-1%, the temperature is 50-80 ℃, the treatment is carried out for 30-60min, and the regenerated cellulose fiber is washed by water and dried.

4. The flexible conductive yarn of claim 1, wherein: and (3) the conductive medium dispersion liquid in the step (3) is one of anionic carbon nano tube, anionic graphene and anionic graphene oxide dispersion liquid, the concentration of the dispersion liquid is 0.5-3%, the temperature is 20-30 ℃, the treatment is carried out for 30-60min, and the conductive medium dispersion liquid is washed by water and dried at room temperature.

5. The flexible conductive yarn of claim 1, wherein: the temperature of the wet heat treatment in the step (4) is 130-150 ℃, the relative humidity is 90%, and the treatment time is 10-15 min.

6. The flexible conductive yarn of claim 1, wherein: the blending ratio of the regenerated cellulose fiber, the acrylic fiber and the polyester staple fiber in the step (2) is 40:10: 50.

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