CN-116463736-B - Stretchable conductive sheath-core composite yarn insensitive to resistance strain and stretching differential method and application thereof

Abstract

The invention provides a stretchable conductive sheath-core composite yarn insensitive to resistance strain, a drafting differential method and application thereof, and relates to the technical field of conductive materials. The stretchable conductive sheath-core composite yarn insensitive to resistance strain comprises an elastic sheath layer and a conductive core wire, wherein the elastic sheath layer is an elastic polymer film layer, the conductive core wire is one of silver-plated conductive yarns, stainless steel conductive yarns, graphene conductive yarns and carbon black conductive yarns, and the conductive core wire is spirally distributed. The stretchable conductive sheath-core composite yarn provided by the invention has the advantages of low cost, excellent strain insensitivity, stretchability, high conductivity, environmental friendliness and external electric insulation.

Inventors

• TIAN MINGWEI
• LIU HONG
• LIU YUANYUAN
• WANG HANG
• LI YUTIAN
• CHEN FUXING

Assignees

• 青岛大学

Dates

Publication Date

20260508

Application Date

20230424

Claims (9)

1. 1. The stretchable conductive sheath-core composite yarn insensitive to resistance strain comprises an elastic sheath layer and a conductive core wire, wherein the elastic sheath layer is an elastic polymer film layer, and the conductive core wire is one of silver-plated conductive yarn, stainless steel conductive yarn, graphene conductive yarn and carbon black conductive yarn, and is spirally distributed; the method for preparing the stretchable conductive sheath-core composite yarn by using the drafting differential method comprises the following steps of: Injecting the conductive yarn wrapped by the delamination auxiliary agent into an elastic polymer spinning pipeline through the spinning pipeline, and then enabling the conductive yarn and the elastic polymer spinning solution to enter a coagulating bath through a composite spinning pipeline together, wherein the elastic polymer spinning solution is coagulated to form an elastic polymer skin layer to obtain a conductive skin-core composite yarn; And enabling the conductive sheath-core composite yarn to enter a drafting zone, sequentially passing through a first drafting roller and a second drafting roller, and performing drafting differential action to obtain the stretchable conductive sheath-core composite yarn, wherein the speed of the second drafting roller is higher than that of the first drafting roller, and the linear speed ratio of the second drafting roller to the first drafting roller is 1-10:1.
2. 2. The stretchable conductive sheath-core composite yarn according to claim 1, wherein the conductive core wire has a diameter of 0.1-1.5 mm and a pitch range of 0.2-5 mm.
3. 3. The stretchable conductive sheath-core composite yarn according to claim 1 or 2, wherein the conductive material content of the conductive core is 0.1-30wt%.
4. 4. The method for preparing the stretchable conductive sheath-core composite yarn according to any one of claims 1 to 3 by a drafting differential method, comprising the following steps: Injecting the conductive yarn wrapped by the delamination auxiliary agent into an elastic polymer spinning pipeline through the spinning pipeline, and then enabling the conductive yarn and the elastic polymer spinning solution to enter a coagulating bath through a composite spinning pipeline together, wherein the elastic polymer spinning solution is coagulated to form an elastic polymer skin layer to obtain a conductive skin-core composite yarn; And enabling the conductive sheath-core composite yarn to enter a drafting zone, sequentially passing through a first drafting roller and a second drafting roller, and performing drafting differential action to obtain the stretchable conductive sheath-core composite yarn, wherein the speed of the second drafting roller is higher than that of the first drafting roller, and the linear speed ratio of the second drafting roller to the first drafting roller is 1-10:1.
5. 5. The method according to claim 4, wherein the delamination auxiliary comprises one or more of distilled water, N-dimethylformamide and ethanol, and the electroconductive yarn wrapped with the delamination auxiliary is injected in a direction perpendicular to a spinning passage direction of the elastic polymer dope.
6. 6. The preparation method of the elastic polymer spinning solution is characterized in that the advancing speed of the elastic polymer spinning solution is 10-50 mL/h, and the injection speed of the conductive yarn wrapped by the delamination auxiliary agent is 10-40 mL/h.
7. 7. The preparation method according to claim 4, wherein the speed of the first drawing roller is 2-10 mm/s, and the speed of the second drawing roller is 10-50 mm/s.
8. 8. The method according to claim 4, wherein the concentration of the elastic polymer spinning solution is 10-70 wt%.
9. 9. Use of the stretchable conductive sheath-core composite yarn according to any one of claims 1 to 3 or the stretchable conductive sheath-core composite yarn prepared by the preparation method according to any one of claims 4 to 8 in stretchable materials.

Description

Stretchable conductive sheath-core composite yarn insensitive to resistance strain and stretching differential method and application thereof Technical Field The invention relates to the technical field of conductive materials, in particular to a stretchable conductive sheath-core composite yarn insensitive to resistance strain, a stretching differential method and application thereof. Background With the rising and continuous development of intelligent electronic textiles and stretchable devices, development and research of conductive materials with stretchability, high conductivity and resistance strain insensitivity are urgently needed. Common resistive strain insensitive conductive materials are prepared by forming certain structures, using specific materials, or a combination of materials and structures. Common researches are to form spiral, serpentine, fold and other structures to construct the strain-insensitive conductive material, or to prepare the strain-insensitive material by adopting liquid metal, conductive polymer and metal nano particles. However, some common research methods are complex and costly. In addition, some strain-insensitive conductive materials may leak conductive substances due to the exposure of the conductive substances, pollute the environment, and risk short circuits. To solve the above problems, liquid metal is usually placed in a silicone tube, and strain insensitivity, environmental friendliness and electrical insulation are achieved due to good properties of the liquid metal itself and protection of the liquid metal by the silicone tube, but the liquid metal is expensive. Disclosure of Invention The invention aims to provide a stretchable conductive sheath-core composite yarn insensitive to resistance strain, a stretching differential method and application thereof, the stretchable conductive sheath-core composite yarn provided by the invention has the advantages of low cost, excellent strain insensitivity, stretchability, high conductivity, environmental friendliness and external electric insulation. In order to achieve the above object, the present invention provides the following technical solutions: The invention provides a stretchable conductive sheath-core composite yarn insensitive to resistance strain, which comprises an elastic sheath layer and a conductive core wire, wherein the elastic sheath layer is an elastic polymer film layer, the conductive core wire is one of silver-plated conductive yarns, stainless steel conductive yarns, graphene conductive yarns and carbon black conductive yarns, and the conductive core wire is spirally distributed. Preferably, the diameter of the conductive core wire is 0.1-1.5 mm, and the pitch range of the conductive core wire is 0.2-5 mm. Preferably, the content of the conductive material in the conductive core wire is 0.1-30wt%. The invention provides a method for preparing a stretchable conductive sheath-core composite yarn by a drafting differential method, which comprises the following steps: Injecting the conductive yarn wrapped by the delamination auxiliary agent into an elastic polymer spinning pipeline through the spinning pipeline, and then enabling the conductive yarn and the elastic polymer spinning solution to enter a coagulating bath through a composite spinning pipeline together, wherein the elastic polymer spinning solution is coagulated to form an elastic polymer skin layer to obtain a conductive skin-core composite yarn; And enabling the conductive sheath-core composite yarn to enter a drafting zone, sequentially passing through a first drafting roller and a second drafting roller, and performing drafting differential action to obtain the stretchable conductive sheath-core composite yarn, wherein the speed of the second drafting roller is higher than that of the first drafting roller. Preferably, the delamination auxiliary agent comprises one or more of distilled water, N-dimethylformamide and ethanol, and the conductive yarn wrapped by the delamination auxiliary agent is injected in a direction perpendicular to the spinning passing direction of the elastic polymer spinning solution. Preferably, the advancing speed of the elastic polymer spinning solution is 10-50 mL/h, and the injection speed of the conductive yarn wrapped by the layering stripping auxiliary agent is 10-40 mL/h. Preferably, the linear speed ratio of the second drafting roller to the first drafting roller is 1-10:1. Preferably, the speed of the first drafting roller is 2-10 mm/s, and the speed of the second drafting roller is 10-50 mm/s. Preferably, the concentration of the elastic polymer spinning solution is 10-70wt%. The invention provides application of the stretchable conductive sheath-core composite yarn prepared by the technical scheme or the preparation method of the stretchable conductive sheath-core composite yarn in a stretchable material. The invention provides a stretchable conductive sheath-core composite yarn insensitive to resist