CN-121992551-A - Tubular braided structure composite yarn with conductivity, preparation method and application thereof

CN121992551ACN 121992551 ACN121992551 ACN 121992551ACN-121992551-A

Abstract

The invention provides a tubular braided structure composite yarn with conductivity, a preparation method and application thereof. The invention adopts a tubular knitting structure, realizes effective protection of conductive components, and isolates the contact with human body when in use. The composite yarn has good conductivity, shows stable and reliable resistance response when voltage is applied, can be repeatedly bent and deformed, and keeps good conductive sensing characteristics and structural stability. Therefore, the sensor has better accuracy and stability when being applied to a strain sensor, is not easily interfered or damaged by external environment, and is suitable for the fields of intelligent wearable display, dynamic camouflage and the like. Meanwhile, 1 or more base yarns are dyed by adopting thermochromic dye, and the prepared composite yarn has thermochromic effect.

Inventors

LIU SAI
Li Jiaoqian
ZHANG HUAPENG
TU LEXI
ZHANG ZHAOFA
YU ZHICAI
HE GUANGYUN
Han Jiangtian

Assignees

浙江理工大学

Dates

Publication Date: 20260508
Application Date: 20260202

Claims (10)

1. A tubular braided structure composite yarn having conductive properties, comprising: the conductive component adopts a conductive heat-generating material and is arranged in the innermost layer as a core yarn; The tubular layer is formed by braiding a plurality of base yarns and is coated on the surface of the conductive component in a hollow tubular shape.
2. The composite yarn of claim 1, wherein said base yarn comprises dyed base yarn and undyed base yarn for protecting said conductive component and for contact separation in use, said dyed base yarn for exhibiting thermochromic effect.
3. A tubular knitted structural composite yarn with conductive properties according to claim 2, wherein said conductive component conducts electricity upon application of a voltage, said dyed base yarn exhibiting a real-time color-changing-fading response cycle.
4. A method for producing a tubular braided structure composite yarn having conductive properties as claimed in any one of claims 1 to 3, comprising the steps of: leading out conductive components from pay-off frames at the rear of the braiding machine and penetrating through the central hole, wherein base yarns are respectively arranged on spindles arranged around the center of the braiding machine; Starting the braiding machine, leading out the conductive components from the hollow tube in the center, unwinding the base yarns from the bobbins respectively to form tubular layers, converging the tubular layers with the conductive components for braiding, and finally forming the tubular braided structure composite yarn with the conductive performance.
5. The method of manufacturing a composite yarn of tubular knitted construction having electrical conductivity according to claim 4, wherein said base yarn is in the range of [4,128] and is arranged symmetrically on the knitting machine with an even number of arrangements selected.
6. The method for producing a composite yarn of tubular knitted construction having electrical conductivity according to claim 4, wherein at least one of the base yarns is dyed with a thermochromic dye before knitting, so that the produced composite yarn has a thermochromic effect.
7. The method for producing a composite yarn of tubular knitted construction having conductive properties according to claim 5 or 6, wherein said conductive component is selected from silver-plated nylon filaments.
8. The method for producing a composite yarn of tubular knitted structure having conductive properties according to claim 4, wherein the knitting angle of the composite yarn is adjusted by controlling the rotational speed of the knitting machine and the number of base yarns, and when the fineness and the number of the conductive components are unchanged, the smaller the knitting angle, the larger the breaking strength of the resulting composite yarn, and the higher the breaking elongation.
9. The method of producing a composite yarn of tubular knitted construction having electrical conductivity according to claim 8, wherein said knitting angle is in the range of 10 ° to 70 °.
10. Use of a composite yarn according to any one of claims 1-3 or obtained according to the method of any one of claims 4-9 in smart wearable displays and dynamic camouflage.

Description

Tubular braided structure composite yarn with conductivity, preparation method and application thereof Technical Field The invention belongs to the technical field of intelligent textile materials, and particularly relates to a tubular braided structure composite yarn with conductivity, a preparation method and application thereof. Background The conductive yarn is used as a functional textile material, has wide application prospect, and can be used for preparing fibers, yarns or fabrics with electrothermal electrochromic properties by combining a conductive heat-generating material with a thermochromic material, thereby providing more possibility for the development of intelligent color-changing textiles. Currently, the methods for applying thermochromic materials to textiles mainly include a coating method and a printing method. The Chinese patent publication No. CN110205688A discloses an electrothermal electrochromic fiber, a preparation method and application thereof, wherein the preparation method forms a color-changing layer and simultaneously directly packages a conductive layer as a core layer in the electrothermal electrochromic fiber to form a three-layer composite structure. The fiber prepared by the method has certain stability, but increases the rigidity and brittleness of the fiber, influences the softness of the whole fabric, and simultaneously reduces the air permeability and the moisture permeability of the fiber due to the composite structure. The Chinese patent with publication number CN107272295A discloses a flexible electrochromic fiber and a method for preparing the flexible electrochromic fiber by using an electrostatic spinning technology, wherein the fiber comprises six layers from inside to outside, five layers are formed at one time by coaxial electrospinning, and single addressing color change regulation and control can be realized after a fabric is formed, so that the effect that the existing color change fabric is difficult to meet is achieved. However, the flexibility and softness of the overall fiber are lower than those of conventional textile fibers, the multi-layer structure affects the moisture absorption and perspiration properties of the fiber, and the safety of the operating voltage and the potential risk of contact with the skin are considered. In conclusion, the existing method generally has the problems of easy hardening of handfeel, limited color-changing area, poor color fastness, poor compatibility with human comfort and the like. In addition, the existing electrothermal electrochromic fiber or fabric is complex in structure, complex in preparation process, difficult to consider both mechanical performance and color-changing performance, unstable in performance under repeated deformation, and limited in practical application in flexible wearable equipment. Therefore, there is a need to develop an electrothermal electrochromic yarn that is stable in structure, sensitive in response, excellent in mechanical properties, and simple to manufacture. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide the composite yarn which has the advantages of good conductivity, stable structure, sensitive color change response, excellent mechanical property and simple preparation method, and the preparation method and application thereof. In order to achieve the above purpose, according to one aspect of the present invention, there is provided a tubular knitted structural composite yarn having conductive properties, including a conductive component, a conductive heat generating material disposed as a core yarn in an innermost layer, and a tubular layer formed by knitting a plurality of base yarns, the tubular layer being hollow and coated on a surface of the conductive component. In another aspect, the present invention provides a method for preparing a composite yarn having a tubular woven structure with conductive properties, for preparing the composite yarn, comprising the steps of: The method comprises the steps of leading out conductive components from pay-off frames at the rear of a braiding machine, penetrating through a central hole, respectively installing base yarns on spindles arranged around the center of the braiding machine, starting the braiding machine, leading out the conductive components from a central hollow tube, respectively unwinding the base yarns from a yarn tube to form a tubular layer, converging the tubular layer with the conductive components for braiding, and finally forming the tubular braiding structure composite yarn with conductive performance. In still another aspect, the invention provides an application of the composite yarn or the composite yarn obtained according to the preparation method in intelligent wearable display and dynamic camouflage. Compared with the prior art, the invention has the following beneficial effects: The invention adopts a tubular knitting structure, realizes effective protecti