A flexible, stretchable, self-healing shielding wire and its preparation method

Abstract

The present invention discloses a flexible, stretchable and self-healing shielding wire, which sequentially includes a flexible conductive layer, a flexible inner insulating layer, a flexible shielding layer and a flexible outer insulating layer from inside to outside. The flexible shielding layer includes: 1-20% of a first conductive component; 3-10% of a second conductive component; 60-94% of a resin and 3-10% of a cross-linking agent. The flexible, stretchable and self-healing shielding wire of the present invention can improve the electromagnetic interference resistance ability, has flexible and stretchable properties, and the shielding layer has a self-healing function, and can be applied in the field of flexible electronics.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible wires, and particularly relates to a flexible, stretchable and self-healing shielded wire. In particular, the present invention also relates to a method for preparing the flexible, stretchable and self-healing shielded wire. Background Art

[0002] A wire with a conductor wrapped outside is called a shielded wire, and the wrapped conductor is called a shielding layer. By grounding, the interference signal is introduced into the ground, which can prevent the interference signal from entering the inner conductor and reduce the loss of the transmitted signal at the same time. Traditional shielded wires use copper braiding, copper foil or aluminum foil as the shielding layer. The processing technology cost of copper braiding is high and the production speed is slow; the bending strength of copper foil or aluminum foil is poor, and it is easy to break when bent repeatedly or there is vibration and friction, resulting in signal attenuation.

[0003] In high-speed system design, integrated circuit pins, high-frequency signal lines and various connectors are common radiation interference sources in flexible printed electronics design. The electromagnetic waves they emit are electromagnetic interference, and both themselves and other systems will be affected and unable to work properly. For example, when transmitting high voltage in flexible electronic devices, high-frequency crosstalk will occur. Therefore, there is an urgent need to develop a flexible and stretchable shielded wire. Summary of the Invention

[0004] The present invention is based on the inventor's discovery and recognition of the following facts and problems:

[0005] In order to improve the anti-interference ability of electronic devices such as electronics, telecommunications, and power, a shielding layer is usually used in shielded wires to improve the anti-electromagnetic interference and prevent signal loss inside the cable and external signal interference. In related technologies, shielding is mainly carried out through metal shielding layers such as copper meshes and copper foils. However, due to the poor bending resistance of metals, the shielding layer is prone to breakage and failure during long-term use. And the existing flexible and stretchable wires generally only have a conductive inner core and an insulating outer shell, and do not have shielding performance.

[0006] The present invention aims to solve at least one of the technical problems in the related technologies to some extent.

[0007] To this end, an embodiment of the present invention provides a flexible, stretchable and self-healing shielded wire, which can improve the anti-electromagnetic interference ability, has flexible and stretchable performance, and the shielding layer has a self-healing function, and can be applied in the field of flexible electronics.

[0008] The flexible, stretchable and self-healing shielded wire according to the first aspect embodiment of the present invention sequentially includes a flexible conductive layer, a flexible inner insulating layer, a flexible shielding layer and a flexible outer insulating layer from inside to outside. The flexible shielding layer includes:

[0009] 1-20% of a first conductive component;

[0010] 3 - 10% of a second conductive component;

[0011] 60 - 94% of a resin; and

[0012] 3 - 10% of a crosslinking agent;

[0013] by mass percentage.

[0014] Advantages and technical effects brought by the independent claims of the flexible stretchable self - healing shielded wire according to the embodiments of the first aspect of the present invention: 1. In the embodiments of the present invention, a flexible shielding layer is introduced into the flexible stretchable wire, improving the electromagnetic interference resistance. The conductive layer, shielding layer, and insulating layer are all made of flexible stretchable materials, so that the finally obtained shielded wire has flexible stretchable properties, with good shielding effect and conductivity, and has little influence on conductivity during the stretching process of the flexible stretchable conductive system; 2. The second conductive component in the shielding layer of the embodiments of the present invention provides the main conductive function to ensure the shielding performance. By adding the first conductive component, the conductive connection between the second conductive components is improved, the conductive path is increased, the conductivity is improved, and multiple reflections of electromagnetic waves can be formed, causing additional losses of electromagnetic waves and improving the shielding performance; 3. The shielding effectiveness of the flexible stretchable self - healing shielded wire in the embodiments of the present invention can reach 70 - 90 db, and the stretchable performance along the length direction can reach 200 - 300%; 4. In the shielding layer of the embodiments of the present invention, crosslinking agents such as boric acid, phenylboric acid, sodium tetraborate, or 3 - carboxyphenylboric acid are added to form a self - healing network through borate bonds. After the bonds are broken, they can quickly form bonds to restore the conductive and shielding properties of the material. During the stretching process, micro - cracks can self - heal, ensuring good conductive and shielding properties of the system. And after the crosslinking agent is crosslinked with the resin, it plays a bonding role to ensure the film - forming property of the shielding layer; 5. The flexible stretchable self - healing shielded wire of the embodiments of the present invention can be applied to radio transmission equipment, audio equipment, network transmission equipment, etc., can work normally in a relatively harsh electromagnetic environment, and itself will not radiate excessive electromagnetic waves to interfere with the normal operation of other surrounding devices and networks.

[0015] For the flexible stretchable self - healing shielded wire according to the embodiments of the first aspect of the present invention, wherein, the first conductive component includes at least one of graphene, carbon nanotubes, or aluminum titanium carbide; and / or, the second conductive component includes at least one of silver nanowires, silver nanoparticles, nickel nanoparticles, copper nanowires, copper nanoparticles, gold nanowires, or gold nanoparticles; and / or, the resin includes at least one of hydroxyl - terminated polydimethylsiloxane, hydroxyl - modified polyurethane, or natural rubber; the crosslinking agent includes at least one of boric acid, phenylboric acid, sodium tetraborate, or 3 - carboxyphenylboric acid.

[0016] The flexible, stretchable and self-healing shielded wire according to the embodiment of the first aspect of the present invention, wherein the flexible conductive layer comprises 0-20% liquid metal, 10-40% nano conductive material, 30-87% resin and 3-10% crosslinking agent, by mass percentage.

[0017] The flexible, stretchable and self-healing shielded wire according to the embodiment of the first aspect of the present invention, wherein the liquid metal comprises at least one of gallium-indium alloy, gallium-tin-indium alloy, gallium-aluminum alloy or gallium-bismuth alloy, with a content of 5-20%; and / or, the nano conductive material comprises at least one of silver nanowires, silver nanoparticles, copper nanowires, copper nanoparticles, gold nanowires, gold nanoparticles, carbon nanotubes or graphene; the resin comprises at least one of hydroxyl-terminated polydimethylsiloxane, hydroxyl-modified polyurethane or natural rubber; and / or, the crosslinking agent comprises at least one of boric acid, phenylboric acid, sodium tetraborate or 3-carboxyphenylboric acid.

[0018] The flexible, stretchable and self-healing shielded wire according to the embodiment of the first aspect of the present invention, wherein the flexible inner insulating layer or outer insulating layer comprises 90-97% resin and 3-10% crosslinking agent, by mass percentage, wherein the resin comprises at least one of hydroxyl-terminated polydimethylsiloxane, hydroxyl-modified polyurethane or natural rubber, and / or, the crosslinking agent comprises at least one of boric acid, phenylboric acid, sodium tetraborate or 3-carboxyphenylboric acid.

[0019] The embodiment of the second aspect of the present invention provides a method for preparing a flexible, stretchable and self-healing shielded wire, comprising separately loading the materials of the flexible conductive layer, flexible inner insulating layer, flexible shielding layer and flexible outer insulating layer into syringes, and performing coaxial printing to obtain a flexible, stretchable and shielded self-healing wire.

[0020] Advantages and technical effects brought by the independent claims of the embodiment according to the second aspect of the present invention: In the embodiment of the present invention, a flexible, stretchable and self-healing shielded wire is prepared by a four-layer coaxial printing method. The preparation method is simple, and the obtained wire has excellent shielding performance and stretching performance.

[0021] The method for preparing a flexible, stretchable and self-healing shielded wire according to the embodiment of the second aspect of the present invention, wherein the flexible conductive layer, flexible inner insulating layer, flexible shielding layer and flexible outer insulating layer are respectively heated to 160-190 °C, maintained for 1-3 hours, and then cooled to room temperature. Then, the materials of each layer are separately loaded into syringes and coaxial printing is performed, with a printing speed of 0.5-100 mm / s and a printing air pressure of 5-90 psi.

[0022] The embodiment of the third aspect of the present invention provides a method for preparing a flexible, stretchable and self-healing shielded wire, comprising the following steps:

[0023] a. Place the flexible conductive layer material into the first mold. After heating and curing to form a shape, remove the first mold to obtain a formed flexible conductive layer.

[0024] b. Place the formed flexible conductive layer obtained in step a at the central position of the second mold. Place the flexible inner insulating layer material into the second mold. After heating and curing to form a shape, remove the second mold to obtain a flexible conductive layer with a formed flexible inner insulating layer coated on the outside.

[0025] c. Place at least one strand of the formed flexible conductive layer with a flexible inner insulating layer coated on the outside obtained in step b at the central position of the third mold. Place the flexible shielding layer material into the third mold. After heating and curing to form a shape, remove the third mold to obtain a flexible conductive layer with a flexible inner insulating layer and a flexible shielding layer coated in sequence from the inside to the outside.

[0026] d. Place the formed flexible conductive layer with a flexible inner insulating layer and a flexible shielding layer coated in sequence from the inside to the outside obtained in step c at the central position of the fourth mold. Place the flexible outer insulating layer material into the fourth mold. After heating and curing to form a shape, remove the fourth mold to obtain a formed flexible stretchable self-healing shielded wire.

[0027] Advantages and technical effects brought by the independent claims of the third aspect embodiment of the present invention: In the embodiment of the present invention, a flexible stretchable self-healing shielded wire is prepared by a mold forming method, which can prepare single-strand wires or multiple-strand wires according to needs. The preparation method is simple, easy to apply, and the obtained wire has excellent shielding performance and stretching performance.

[0028] The fourth aspect embodiment of the present invention provides a method for preparing a flexible stretchable self-healing shielded wire, including the following steps:

[0029] a. Load the flexible conductive layer and the flexible inner insulating layer material into syringes respectively, and perform coaxial printing to obtain a flexible conductive layer with a flexible inner insulating layer coated on the outside.

[0030] b. Place at least one strand of the flexible conductive layer with a flexible inner insulating layer coated on the outside obtained in step a at the central position of the first mold. Place the flexible shielding layer material into the first mold. After heating and curing to form a shape, remove the first mold to obtain a flexible conductive layer with a flexible inner insulating layer and a flexible shielding layer coated in sequence from the inside to the outside.

[0031] c. Place the formed flexible conductive layer coated with a flexible inner insulating layer and a flexible shielding layer in sequence from the inside to the outside at the central position of the second mold. Place the flexible outer insulating layer material into the second mold. After heating and curing to form, remove the second mold to obtain a formed flexible stretchable self-healing shielded wire.

[0032] Advantages and technical effects brought by the independent claims of the fourth aspect embodiment of the present invention: In the embodiments of the present invention, a flexible stretchable self-healing shielded wire is prepared by a combination of mold forming and coaxial printing. It can prepare single-strand wires and can also prepare multi-strand wires according to needs. The preparation method is simple, easy to apply, and the obtained wires have excellent shielding performance and tensile properties.

[0033] According to the preparation method of the flexible stretchable self-healing shielded wire of the fourth aspect embodiment of the present invention, wherein, before the step a, there is also a step aa of heating the flexible conductive layer, the flexible inner insulating layer, the flexible shielding layer and the flexible outer insulating layer material to 160 - 190 °C, maintaining for 1 - 3 hours, and then cooling to room temperature; and / or, in the step a, the printing speed is 0.5 - 100 mm / s, and the printing air pressure is 5 - 90 psi; and / or, in the step b or c, the temperature of the curing and forming is 60 - 120 °C, and the curing time is 10 - 90 minutes. Description of the Drawings

[0034] Figure 1 It is a schematic structural diagram of the coaxial printing system in Embodiment 1 of the present invention;

[0035] Figure 2 It is a schematic structural diagram of the coaxial printing needle head and the printed wire structure in Embodiment 1 of the present invention;

[0036] Figure 3 It is a schematic structural diagram of the flexible stretchable self-healing shielded wire obtained in Embodiment 1 of the present invention;

[0037] Figure 4 It is a schematic structural diagram of the mold used in Embodiment 6 of the present invention;

[0038] Figure 5 It is a schematic structural diagram of the flexible stretchable self-healing shielded wire obtained in Embodiment 7 of the present invention;

[0039] Figure 6 It is a schematic structural diagram of the coaxial printing system in Embodiment 8 of the present invention;

[0040] Figure 7 It is a schematic structural diagram of the coaxial printing needle head and the printed wire structure in Embodiment 8 of the present invention. Detailed Description of the Invention

[0041] Embodiments of the present invention will be described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] The flexible stretchable self-healing shielding wire according to the embodiment of the first aspect of the present invention sequentially includes a flexible conductive layer, a flexible inner insulating layer, a flexible shielding layer, and a flexible outer insulating layer from the inside to the outside. The flexible shielding layer includes:

[0043] 1-20% of a first conductive component;

[0044] 3-10% of a second conductive component;

[0045] 60-94% of a resin; and

[0046] 3-10% of a crosslinking agent;

[0047] Based on mass percentage.

[0048] There are no particular limitations on the flexible conductive layer, the flexible inner insulating layer, and the flexible outer insulating layer of the flexible stretchable self-healing shielding wire according to the embodiment of the present invention, and any materials that can endow the wire with flexible characteristics can be used.

[0049] Advantages and technical effects brought by the independent claims of the embodiment according to the first aspect of the present invention: 1. In the embodiment of the present invention, a flexible shielding layer is introduced into the flexible stretchable wire, which improves the electromagnetic interference resistance. The conductive layer, shielding layer and insulating layer are all made of flexible stretchable materials, so that the finally obtained shielding wire has flexible stretchable performance, with good shielding effect and conductivity, and has little influence on the conductivity during the stretching process of the flexible stretchable conductive system; 2. In the embodiment of the present invention, the second conductive component in the shielding layer provides the main conductive function to ensure the shielding performance. By adding the first conductive component, the conductive connection between the second conductive components is improved, the conductive path is increased, the conductivity is improved, and multiple reflections of electromagnetic waves can be formed, resulting in additional losses of electromagnetic waves and improving the shielding performance; 3. The shielding effectiveness of the flexible stretchable self-healing shielding wire in the embodiment of the present invention can reach 70-90 db, and the stretchable performance can reach 200-300%; 4. In the shielding layer of the embodiment of the present invention, crosslinking agents such as boric acid, phenylboric acid, sodium tetraborate or 3-carboxyphenylboric acid are added to form a self-healing network through borate bonds. After the bonds are broken, they can quickly form bonds to restore the conductive performance and shielding performance of the material. During the stretching process, microcracks can self-heal, ensuring good conductive performance and shielding performance of the system. And after the crosslinking agent is crosslinked with the resin, it plays a bonding role to ensure the film-forming property of the shielding layer; 5. The flexible stretchable self-healing shielding wire in the embodiment of the present invention can be applied to radio transmission equipment, audio equipment, network transmission equipment, etc., can work normally in a relatively harsh electromagnetic environment, and will not radiate excessive electromagnetic waves to interfere with the normal work of other surrounding devices and networks.

[0050] For the flexible stretchable self-healing shielding wire according to the embodiment of the first aspect of the present invention, wherein, the first conductive component includes at least one of graphene, carbon nanotubes or aluminum titanium carbide; and / or, the second conductive component includes at least one of silver nanowires, silver nanoparticles, nickel nanoparticles, copper nanowires, copper nanoparticles, gold nanowires or gold nanoparticles; and / or, the resin includes at least one of hydroxyl-terminated polydimethylsiloxane, hydroxyl-modified polyurethane or natural rubber; and / or, the crosslinking agent includes at least one of boric acid, phenylboric acid, sodium tetraborate or 3-carboxyphenylboric acid.

[0051] The flexible, stretchable and self-healing shielding wire according to the embodiment of the first aspect of the present invention, wherein the flexible conductive layer comprises 0-20% of liquid metal, 10-40% of nano-conductive material, 30-87% of resin and 3-10% of cross-linking agent, by mass percentage. Preferably, the liquid metal comprises at least one of gallium-indium alloy, gallium-tin-indium alloy, gallium-aluminum alloy or gallium-bismuth alloy. Preferably, the content of liquid metal in the flexible conductive layer is 5-20%; and / or, the nano-conductive material comprises at least one of silver nanowires, silver nanoparticles, copper nanowires, copper nanoparticles, gold nanowires, gold nanoparticles, carbon nanotubes or graphene; and / or, the resin comprises at least one of hydroxyl-terminated polydimethylsiloxane, hydroxyl-modified polyurethane or natural rubber; and / or, the cross-linking agent comprises at least one of boric acid, phenylboric acid, sodium tetraborate or 3-carboxyphenylboric acid. The materials selected for the conductive layer in the embodiments of the present invention have excellent electrical conductivity and have little influence on the conductivity during the stretching process of the flexible and stretchable conductive system. The liquid metal is in a liquid state and still has good electrical conductivity during the stretching process; the metal nano-materials or conductive carbon materials form good conductive paths through the conductive percolation network. Although the metal nano-materials slide during the stretching process, due to the conductive bridging effect of the liquid metal at the joints of the nano-materials, the overall electrical conductivity of the conductive percolation network is still very good. Moreover, the embodiments of the present invention also contain cross-linking agents such as boric acid, phenylboric acid, sodium tetraborate or 3-carboxyphenylboric acid. During the stretching process, micro-cracks can self-heal, ensuring good electrical conductivity of the system.

[0052] The flexible, stretchable and self-healing shielding wire according to the embodiment of the first aspect of the present invention, wherein the flexible inner insulating layer or outer insulating layer comprises 90-97% of resin and 3-10% of cross-linking agent, by mass percentage. Among them, the resin comprises at least one of hydroxyl-terminated polydimethylsiloxane, hydroxyl-modified polyurethane or natural rubber, and / or, the cross-linking agent comprises at least one of boric acid, phenylboric acid, sodium tetraborate or 3-carboxyphenylboric acid. Cross-linking agents such as boric acid, phenylboric acid, sodium tetraborate or 3-carboxyphenylboric acid are added to the insulating layer in the embodiments of the present invention. During the stretching process, micro-cracks can self-heal, ensuring the insulating performance of the insulating layer.

[0053] The embodiment of the second aspect of the present invention provides a preparation method of a flexible, stretchable and self-healing shielding wire, comprising the following steps:

[0054] a. According to the formulations of the flexible conductive layer, flexible inner insulating layer, flexible shielding layer, and flexible outer insulating layer of the flexible stretchable self-healing shielding wire in the first aspect embodiment of the present invention, take the materials of the flexible conductive layer, flexible inner insulating layer, flexible shielding layer, and flexible outer insulating layer in the designed proportions. Preferably, heat the materials of each layer of the wire to 160 - 190 °C, keep for 1 - 3 hours, and then cool to room temperature;

[0055] b. Load the materials of each layer in step a into syringes respectively and perform coaxial printing. Preferably, the printing speed is 0.5 - 100 mm / s and the printing air pressure is 5 - 90 psi to obtain a flexible stretchable self-healing shielding wire.

[0056] Advantages and technical effects brought by the independent claims in the second aspect embodiment of the present invention: In the embodiment of the present invention, a flexible stretchable self-healing shielding wire is prepared by a four-layer coaxial printing method. The preparation method is simple, and the obtained wire has excellent shielding performance and tensile properties.

[0057] The third aspect embodiment of the present invention provides a preparation method of a flexible stretchable self-healing shielding wire, including the following steps:

[0058] a. According to the formulations of the flexible conductive layer, flexible inner insulating layer, flexible shielding layer, and flexible outer insulating layer of the flexible stretchable self-healing shielding wire in the first aspect embodiment of the present invention, take the materials of the flexible conductive layer, flexible inner insulating layer, flexible shielding layer, and flexible outer insulating layer in the designed proportions;

[0059] b. Put the flexible conductive layer material into the first mold, heat and cure it into a shape and then remove the first mold. Preferably, the curing temperature is 60 - 120 °C and the curing time is 10 - 90 minutes to obtain a formed conductive layer;

[0060] c. Put the formed flexible conductive layer obtained in step b at the central position of the second mold, put the flexible inner insulating layer material into the second mold, heat and cure it into a shape and then remove the second mold. Preferably, the curing temperature is 60 - 120 °C and the curing time is 10 - 90 minutes to obtain a flexible conductive layer with a formed flexible inner insulating layer coated on the outside;

[0061] d. Put at least one strand of the formed flexible conductive layer with a formed flexible inner insulating layer coated on the outside obtained in step c at the central position of the third mold, put the flexible shielding layer material into the third mold, heat and cure it into a shape and then remove the third mold. Preferably, the curing temperature is 60 - 120 °C and the curing time is 10 - 90 minutes to obtain a formed flexible conductive layer with a flexible inner insulating layer and a flexible shielding layer coated on the outside in sequence from the inside to the outside;

[0062] e. Place the formed flexible conductive layer coated with a flexible inner insulating layer and a flexible shielding layer from the inside out obtained in step d at the center position of the fourth mold. Place the flexible outer insulating layer material into the fourth mold. After heating and curing to form, remove the fourth mold. Preferably, the curing temperature is 60 - 120 °C, and the curing time is 10 - 90 minutes to obtain a formed flexible stretchable self-healing shielded wire.

[0063] Advantages and technical effects brought by the independent claims of the third aspect embodiment of the present invention: In the embodiments of the present invention, a flexible stretchable self-healing shielded wire is prepared by a mold forming method, which can prepare single-strand wires and can also prepare multi-strand wires such as two-strand, three-strand, four-strand, five-strand... according to needs. The preparation method is simple, easy to apply, and the prepared wire has excellent shielding performance and stretching performance.

[0064] An embodiment of the fourth aspect of the present invention provides a method for preparing a flexible stretchable self-healing shielded wire, including the following steps:

[0065] a. According to the formulations of the flexible conductive layer, flexible inner insulating layer, flexible shielding layer, and flexible outer insulating layer of the flexible stretchable self-healing shielded wire in the first aspect embodiment of the present invention, take the materials of the flexible conductive layer, flexible inner insulating layer, flexible shielding layer, and flexible outer insulating layer in the designed ratio. Preferably, heat the materials of each layer of the wire to 160 - 190 °C, keep for 1 - 3 hours, and then cool to room temperature;

[0066] b. Load the flexible conductive layer and flexible inner insulating layer materials from step a into syringes respectively, and perform coaxial printing to obtain a flexible conductive layer coated with a flexible inner insulating layer on the outside. Preferably, the printing speed is 0.5 - 100 mm / s, and the printing air pressure is 5 - 90 psi;

[0067] c. Place at least one strand of the flexible conductive layer coated with a flexible inner insulating layer obtained in step b at the center position of the first mold. Place the flexible shielding layer material into the first mold. After heating and curing to form, remove the first mold. Preferably, the curing temperature is 60 - 120 °C, and the curing time is 10 - 90 minutes to obtain a formed flexible conductive layer coated with a flexible inner insulating layer and a flexible shielding layer from the inside out;

[0068] d. Place the formed flexible conductive layer coated with a flexible inner insulating layer and a flexible shielding layer from the inside out obtained in step c at the center position of the second mold. Place the flexible outer insulating layer material into the second mold. After heating and curing to form, remove the second mold. Preferably, the curing temperature is 60 - 120 °C, and the curing time is 10 - 90 minutes to obtain a formed flexible stretchable self-healing shielded wire.

[0069] Advantages and technical effects brought by the independent claims of the embodiments according to the fourth aspect of the present invention: In the embodiments of the present invention, a flexible, stretchable and self-healing shielded wire is prepared by combining die forming and coaxial printing. Single-strand wires can be prepared, and multi-strand wires such as two-strand, three-strand, four-strand, five-strand... can also be prepared as needed. The preparation method is simple, easy to apply, and the prepared wire has excellent shielding performance and tensile performance.

[0070] By using the preparation methods of the embodiments of the present invention, flexible, stretchable and self-healing shielded wires can be finally obtained. Among them, the diameter of the conductive layer is 2-10 mm, the thickness of the inner insulating layer is 0.2-2 mm, the thickness of the shielding layer is 0.1-1 mm, and the thickness of the outer insulating layer is 0.5-5 mm.

[0071] In the embodiments of the present invention, the coaxial printing and die forming methods can be combined. Among the four layers from the inside to the outside, the conductive layer can be selected for coaxial printing, and the remaining layers can be formed by die forming to obtain a flexible, stretchable and self-healing shielded wire; or the conductive layer + inner insulating layer can be coaxial printed, or the conductive layer + inner insulating layer + shielding layer can be coaxial printed, and the remaining layers can be formed by die forming to obtain a flexible, stretchable and self-healing shielded wire.

[0072] The raw materials used in the embodiments of the present invention can all be obtained by purchasing in the market.

[0073] Example 1: A flexible, stretchable and self-healing shielded wire is prepared by coaxial printing and forming

[0074] Prepare the conductive layer: According to the formula of 6 wt% gallium-tin-indium alloy, 30 wt% copper nanowires, 59 wt% hydroxyl-terminated PDMS (i.e., hydroxyl-terminated polydimethylsiloxane) and 5 wt% boric acid, weigh each material, mix them evenly by mechanical stirring, gradually heat to 165 °C, and keep for 1.5 hours. Then, the cross-linking agent solid powder boric acid reacts with hydroxyl-terminated PDMS to form borate bonds, and the system becomes a transparent colloidal state. Cool it to room temperature and load it into a syringe for standby;

[0075] Prepare the inner insulating layer: According to the formula of 95 wt% hydroxyl-modified polyurethane and 5 wt% phenylboric acid, weigh each material, mix them evenly by mechanical stirring, gradually heat to 160 °C, and keep for 2 hours. Then, the cross-linking agent solid powder phenylboric acid reacts with hydroxyl-modified polyurethane to form borate bonds, and the system becomes a transparent colloidal state. Cool it to room temperature and load it into a syringe for standby;

[0076] Preparation of the shielding layer: Weigh each material according to the formula of 5 wt% graphene, 4 wt% silver nanoparticles, 83 wt% hydroxyl-terminated PDMS, and 8 wt% boric acid. After mixing them evenly by mechanical stirring, gradually heat to 170 °C and keep for 1 hour. Then, the cross-linking agent solid powder boric acid reacts with the hydroxyl-terminated PDMS to form borate bonds. The system becomes a transparent colloidal state. Cool it down to room temperature and fill it into a syringe for standby.

[0077] Preparation of the outer insulating layer: Weigh each material according to the formula of 96 wt% natural rubber and 4 wt% phenylboric acid. After mixing them evenly by mechanical stirring, gradually heat to 190 °C and keep for 1 hour. Then, the cross-linking agent solid powder phenylboric acid reacts with the hydroxyl-modified polyurethane to form borate bonds. The system becomes a transparent colloidal state. Cool it down to room temperature and fill it into a syringe for standby.

[0078] As Figure 1 and Figure 2 shown, load the conductive layer, inner insulating layer, shielding layer, and outer insulating layer materials into the printing syringes 1, 2, 3, and 4 respectively. Specifically, refer to Figure 2 , the printing syringes 1, 2, 3, and 4 are respectively connected to the dispensing systems of the nozzle center layer, the first nozzle intermediate layer, the second nozzle intermediate layer, and the nozzle outer layer in a one-to-one correspondence. Adjust the printing parameters to perform coaxial printing of the flexible, stretchable, and self-healing shielding wire. Preferably, the printing speed is 20 mm / s, the printing air pressure of the conductive layer is 25 psi, the printing air pressure of the inner insulating layer is 50 psi, the printing air pressure of the shielding layer is 40 psi, and the printing air pressure of the outer insulating layer is 80 psi.

[0079] The structure of the prepared flexible, stretchable, and self-healing shielding wire is shown in Figure 3 , the diameter of the conductive layer of the flexible, stretchable, and self-healing shielding wire prepared in this example is 3 mm, the thickness of the inner insulating layer is 0.5 mm, the thickness of the shielding layer is 0.2 mm, the thickness of the outer insulating layer is 4 mm, the shielding effectiveness is 75 db, it can be stretched by 230% along the length direction of the wire, the resistance per unit length of the wire is 0.5 Ω / m, when the stretching rate of the wire is 80% of the elongation at break, the resistance per unit length of the wire is 0.52 Ω / m, and the shielding effectiveness of the wire is 73 db.

[0080] Example 2 uses coaxial printing to prepare a flexible, stretchable, and self-healing shielding wire

[0081] The method is the same as that in Example 1, except that the formula of the shielding layer is different. The formula of the shielding layer in Example 2 is 1 wt% aluminum titanium carbide, 8 wt% silver nanoparticles, 83 wt% hydroxyl-terminated PDMS, and 8 wt% sodium tetraborate.

[0082] The structure of the flexible, stretchable, and self-healing shielding wire prepared by the method of Example 2 can be referred toFigure 3 In this embodiment, the diameter of the conductive layer of the flexible, stretchable, self-healing shielded wire is 3 mm, the thickness of the inner insulating layer is 0.5 mm, the thickness of the shielding layer is 0.2 mm, and the thickness of the outer insulating layer is 4 mm. The shielding effectiveness of the prepared flexible, stretchable, self-healing shielded wire is 70 dB, it can be stretched by 235% along the length of the wire, the resistance per unit length of the wire is 0.51 Ω / m, when the stretching rate of the wire is 80% of the elongation at break, the resistance per unit length of the wire is 0.53 Ω / m, and the shielding effectiveness of the wire is 62 dB.

[0083] Example 3 uses coaxial printing to fabricate a flexible, stretchable, self-healing shielded wire.

[0084] The method is the same as that of Example 1, except that the formulation of the shielding layer is different. The formulation of the shielding layer in Example 3 is 3 wt% graphene, 3 wt% silver nanoparticles, 91 wt% hydroxyl-modified polyurethane, and 3 wt% 3-carboxylphenylboronic acid.

[0085] The structure of the flexible, stretchable, self-healing shielded wire prepared by the method in this Example 3 can be seen in Figure 3 In this embodiment, the diameter of the conductive layer of the flexible, stretchable, self-healing shielded wire is 3 mm, the thickness of the inner insulating layer is 0.5 mm, the thickness of the shielding layer is 0.2 mm, and the thickness of the outer insulating layer is 4 mm. The shielding effectiveness of the prepared flexible, stretchable, self-healing shielded wire is 71 dB, it can be stretched by 280% along the length of the wire, the resistance per unit length of the wire is 0.5 Ω / m, when the stretching rate of the wire is 80% of the elongation at break, the resistance per unit length of the wire is 0.52 Ω / m, and the shielding effectiveness of the wire is 68 dB.

[0086] Example 4 uses coaxial printing to fabricate a flexible, stretchable, self-healing shielded wire.

[0087] The method is the same as that of Example 1, except that the formulation of the shielding layer is different. The formulation of the shielding layer in Example 4 is 20 wt% graphene, 10 wt% silver nanoparticles, 67 wt% hydroxyl-modified polyurethane, and 3 wt% boric acid.

[0088] The structure of the flexible, stretchable, self-healing shielded wire prepared by the method in Example 4 can be referred to Figure 3 In this embodiment, the diameter of the conductive layer of the flexible, stretchable, self-healing shielded wire is 3 mm, the thickness of the inner insulating layer is 0.5 mm, the thickness of the shielding layer is 0.2 mm, and the thickness of the outer insulating layer is 4 mm. The shielding effectiveness of the prepared flexible, stretchable, self-healing shielded wire is 90 dB, it can be stretched by 200% along the length of the wire, the resistance per unit length of the wire is 0.48 Ω / m, when the stretching rate of the wire is 80% of the elongation at break, the resistance per unit length of the wire is 0.51 Ω / m, and the shielding effectiveness of the wire is 88 dB.

[0089] Example 5: Preparation of a flexible, stretchable, self-healing shielded wire by coaxial printing

[0090] The method is the same as that in Example 1, except that the formulation of the conductive layer is different. The formulation of the conductive layer in Example 5 is 36 wt% copper nanowires, 59 wt% hydroxyl-terminated PDMS, and 5 wt% boric acid.

[0091] The structure of the flexible, stretchable, self-healing shielded wire prepared by the method of Example 5 can be referred to Figure 3 , the diameter of the conductive layer of the flexible, stretchable, self-healing shielded wire prepared in this example is 3 mm, the thickness of the inner insulating layer is 0.5 mm, the thickness of the shielding layer is 0.2 mm, the thickness of the outer insulating layer is 4 mm, the shielding effectiveness of the prepared flexible, stretchable, self-healing shielded wire is 76 db, it can be stretched by 240% along the length direction of the wire, the resistance per unit length of the wire is 1.5 Ω / m, when the stretching rate of the wire is 80% of the elongation at break, the resistance per unit length of the wire is 5.3 Ω / m, and the shielding effectiveness of the wire is 74 db.

[0092] Example 6: Preparation of a flexible, stretchable, self-healing shielded wire by die molding

[0093] Prepare the conductive layer: Weigh each material according to the formulation of 15 wt% gallium-aluminum alloy, 10 wt% carbon nanotubes, 65 wt% hydroxyl-modified polyurethane, and 10 wt% boric acid. After mixing evenly by mechanical stirring, gradually heat to 165 °C, keep for 1.5 hours, then cool to room temperature for standby;

[0094] Prepare the inner insulating layer: Weigh each material according to the formulation of 90 wt% hydroxyl-modified polyurethane and 10 wt% phenylboric acid. After mixing evenly by mechanical stirring, gradually heat to 160 °C, keep for 2 hours, then cool to room temperature for standby;

[0095] Prepare the shielding layer: Weigh each material according to the formulation of 15 wt% carbon nanotubes, 10 wt% nickel nanoparticles, 70 wt% hydroxyl-modified polyurethane, and 5 wt% boric acid. After mixing evenly by mechanical stirring, gradually heat to 170 °C, keep for 1 hour, then cool to room temperature for standby;

[0096] Prepare the outer insulating layer: Weigh each material according to the formulation of 90 wt% natural rubber and 10 wt% phenylboric acid. After mixing evenly by mechanical stirring, gradually heat to 190 °C, keep for 1 hour, then cool to room temperature for standby.

[0097] As Figure 4As shown, the mold used in the mold forming method is for injecting wire materials, and the mold has a cylindrical cavity inside. Preferably, the mold is composed of sub-molds A and B with the same structure. Both sub-mold A and sub-mold B are long modules provided with semi-circular grooves. After combining the sides with grooves of sub-mold A and sub-mold B, a mold with a cylindrical cavity inside is formed. The mold is divided into two identical parts. On the one hand, the production cost of the mold is low. On the other hand, it is convenient for the assembly and disassembly of the mold.

[0098] In this embodiment, the first mold, the second mold, the third mold, and the fourth mold are used to prepare a flexible conductive layer, a flexible inner insulating layer, a flexible shielding layer, and a flexible outer insulating layer in sequence, and the radii of the cylindrical cavities of the first mold, the second mold, the third mold, and the fourth mold increase in sequence.

[0099] Put the uniformly mixed flexible conductive layer material into the first mold, heat it at 80 °C for 20 minutes for curing and forming, then remove the first mold to obtain a formed conductive layer; put the formed conductive layer at the central position of the second mold, and then put the uniformly mixed flexible inner insulating layer material into the second mold, heat it at 90 °C for 10 minutes for curing and forming, then remove the second mold to obtain a flexible conductive layer with an inner insulating layer coated on the outside; put the flexible conductive layer with a flexible inner insulating layer coated on the outside at the central position of the third mold, put the uniformly mixed shielding layer material into the third mold, heat it at 85 °C for 15 minutes for curing and forming, then remove the third mold to obtain a flexible conductive layer with a flexible inner insulating layer and a flexible shielding layer coated on the outside in sequence from the inside to the outside; put the flexible conductive layer with a flexible inner insulating layer and a flexible shielding layer coated on the outside in sequence from the inside to the outside at the central position of the fourth mold, put the uniformly mixed flexible outer insulating layer material into the fourth mold, heat it at 110 °C for 10 minutes for curing and forming, then remove the fourth mold to obtain a formed flexible stretchable self-healing shielded wire, where the flexible conductive layer of the flexible stretchable self-healing shielded wire is coated with a flexible inner insulating layer, a flexible shielding layer, and a flexible outer insulating layer in sequence from the inside to the outside.

[0100] The diameter of the conductive layer of the finally obtained flexible stretchable self-healing shielded wire in this embodiment is 6 mm, the thickness of the inner insulating layer is 0.6 mm, the thickness of the shielding layer is 0.5 mm, the thickness of the outer insulating layer is 4 mm, the shielding effectiveness is 86 db, it can be stretched by 205% along the length direction of the wire, the resistance per unit length of the wire is 0.65 Ω / m, when the stretching rate of the wire is 80% of the elongation at break, the resistance per unit length of the wire is 0.68 Ω / m, and the shielding effectiveness of the wire is 84 db.

[0101] Example 7 uses a mold forming method to prepare a multi-strand flexible stretchable self-healing shielded wire

[0102] Example 7 is different from Example 6 in that: the flexible conductive layer with multiple strands formed and wrapped with a flexible inner insulating layer is placed at the center position of the second mold, and the uniformly mixed flexible shielding layer material is put into the mold. After heating at 85 °C for 15 minutes for curing and forming, the mold is removed to obtain a formed conductive layer wrapped with a flexible shielding layer and a flexible inner insulating layer from the inside to the outside in sequence. In this example, the multiple strands are preferably three strands.

[0103] The stretchable self-healing shielded wire prepared in this example is a three-strand wire. The outside of each formed conductive layer is wrapped with an inner insulating layer, and the three conductive layers wrapped with an inner insulating layer on the outside are sequentially wrapped with a shielding layer and an outer insulating layer. The structure is shown in Figure 5 , the diameter of the conductive layer is 6 mm, the thickness of the inner insulating layer is 0.7 mm, the thickness of the shielding layer is 0.5 mm, the thickness of the outer insulating layer is 4 mm, the shielding effectiveness is 88 db, it can be stretched by 206% along the length direction of the wire, the resistance per unit length of the wire is 0.59 Ω / m, when the stretching rate of the wire is 80% of the elongation at break, the resistance per unit length of the wire is 0.62 Ω / m, and the shielding effectiveness of the wire is 86 db.

[0104] Example 8 prepares a multi-strand flexible stretchable self-healing shielded wire by combining coaxial printing and mold forming

[0105] Prepare the conductive layer: According to the formula of 20 wt% gallium-indium alloy, 10 wt% silver nano-particles, 67 wt% hydroxyl-terminated PDMS, and 3 wt% boric acid, weigh each material, mix them evenly by mechanical stirring, gradually heat to 165 °C, keep it for 1.5 hours, then cool down to room temperature, and load it into a syringe for standby;

[0106] Prepare the inner insulating layer: According to the formula of 97 wt% hydroxyl-modified polyurethane and 3 wt% phenylboric acid, weigh each material, mix them evenly by mechanical stirring, gradually heat to 160 °C, keep it for 2 hours, then cool down to room temperature, and load it into a syringe for standby;

[0107] Prepare the shielding layer: According to the formula of 20 wt% aluminum titanium carbide, 6 wt% silver nano-particles, 64 wt% hydroxyl-terminated PDMS, and 10 wt% phenylboric acid, weigh each material, mix them evenly by mechanical stirring, gradually heat to 170 °C, keep it for 1 hour, then cool down to room temperature, and set aside;

[0108] Prepare the outer insulating layer: According to the formula of 97 wt% natural rubber and 3 wt% phenylboric acid, weigh each material, mix them evenly by mechanical stirring, gradually heat to 190 °C, keep it for 1 hour, then cool down to room temperature, and set aside.

[0109] As Figure 6 and Figure 7As shown, the conductive layer and the inner insulating layer material are respectively loaded into the printing syringes 1 and 2. Specifically, the printing syringes 1 and 2 are respectively connected in one-to-one correspondence with the dispensing systems of the inner layer and the outer layer of the nozzle. The printing parameters are adjusted to perform coaxial printing. Preferably, the printing speed is 20 mm / s, the printing air pressure of the conductive layer is 25 psi, and the printing air pressure of the inner insulating layer is 50 psi. Finally, a flexible conductive layer coated with a flexible inner insulating layer on the outside is obtained, where the diameter of the conductive layer is 3 mm and the thickness of the inner insulating layer is 0.5 mm.

[0110] In this embodiment, the Figure 4 shown mold is adopted. The first mold and the second mold are used to prepare the flexible shielding layer and the flexible outer insulating layer in sequence, where the radius of the cylindrical cavity of the second mold is larger than that of the first mold. The multi-strand formed flexible conductive layer coated with a flexible inner insulating layer on the outside is placed at the central position of the first mold, and the uniformly mixed shielding layer material is placed in the first mold. After curing and forming by heating at 90 °C for 15 minutes, the first mold is removed to obtain a formed flexible conductive layer coated with a flexible inner insulating layer and a flexible shielding layer from the inside to the outside; the formed flexible conductive layer coated with a flexible inner insulating layer and a flexible shielding layer from the inside to the outside is placed at the central position of the second mold, and the uniformly mixed flexible outer insulating layer material is placed in the second mold. After curing and forming by heating at 110 °C for 8 minutes, the second mold is removed to obtain a formed flexible stretchable self-healing shielding wire, where the flexible conductive layer of the flexible stretchable self-healing shielding wire is coated with a flexible inner insulating layer, a flexible shielding layer and a flexible outer insulating layer from the inside to the outside. In this embodiment, the multi-strand is preferably three strands.

[0111] The flexible stretchable self-healing shielding wire prepared in this embodiment is a three-strand wire. The outside of each formed conductive layer is coated with an inner insulating layer, and the three conductive layers coated with an inner insulating layer on the outside are sequentially coated with a shielding layer and an outer insulating layer. Its structure is as Figure 5 shown. The diameter of the conductive layer is 3 mm, the thickness of the inner insulating layer is 0.5 mm, the thickness of the shielding layer is 0.4 mm, the thickness of the outer insulating layer is 3.5 mm, the shielding effectiveness is 89 db, it can be stretched by 201% along the length direction of the wire, the resistance per unit length of the wire is 0.7 Ω / m, when the stretching rate of the wire is 80% of the elongation at break, the resistance per unit length of the wire is 0.72 Ω / m, and the shielding effectiveness of the wire is 87 db.

[0112] Comparative Example 1

[0113] The method of Comparative Example 1 is the same as that of Example 1, the difference being that the formulation of the shielding layer is different. The formulation of the shielding layer in Comparative Example 1 is 5 wt% graphene, 4 wt% silver nanoparticles, 83 wt% hydroxyl-terminated PDMS and 8 wt% trimethoxysilane coupling agent.

[0114] The diameter of the conductive layer of the flexible and stretchable shielded wire prepared in Comparative Example 1 is 3 mm, the thickness of the inner insulating layer is 0.5 mm, the thickness of the shielding layer is 0.2 mm, the thickness of the outer insulating layer is 4 mm, the shielding effectiveness is 75 db, it can be stretched by 220% along the wire length direction, the resistance per unit length of the wire is 0.55 Ω / m, when the stretching rate of the wire is 80% of the elongation at break, the resistance per unit length of the wire is 0.61 Ω / m, and the shielding effectiveness of the wire drops to 24 db.

[0115] Comparative Example 2

[0116] The method of Comparative Example 2 is the same as that of Example 1, the difference is that the formulation of the shielding layer is different. The shielding layer formulation of Comparative Example 2 does not contain graphene, and its formulation is 9 wt% silver nanoparticles, 83 wt% hydroxyl-terminated PDMS, and 8 wt% boric acid.

[0117] The diameter of the conductive layer of the flexible and stretchable shielded wire prepared in Comparative Example 2 is 3 mm, the thickness of the inner insulating layer is 0.5 mm, the thickness of the shielding layer is 0.2 mm, the thickness of the outer insulating layer is 4 mm, the shielding effectiveness is 60 db, it can be stretched by 225% along the wire length direction, the resistance per unit length of the wire is 0.54 Ω / m, when the stretching rate of the wire is 80% of the elongation at break, the resistance per unit length of the wire is 0.58 Ω / m, and the shielding effectiveness of the wire is 45 db.

[0118] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0119] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A flexible, stretchable and self-healing shielded wire, characterized in that, it sequentially includes a flexible conductive layer, a flexible inner insulating layer, a flexible shielding layer and a flexible outer insulating layer from inside to outside. The flexible shielding layer includes: 1-20% of a first conductive component; 3-10% of a second conductive component; 60-91% of a resin; and 3-10% of a crosslinking agent; by mass percentage; wherein, the first conductive component includes at least one of graphene, carbon nanotubes or aluminum titanium carbide; the second conductive component includes at least one of silver nanowires, silver nanoparticles, nickel nanoparticles, copper nanowires, copper nanoparticles, gold nanowires or gold nanoparticles. The first conductive component improves the conductive connection between the second conductive components and increases the conductive path; the resin includes at least one of hydroxyl-terminated polydimethylsiloxane, hydroxyl-modified polyurethane or natural rubber; the crosslinking agent includes at least one of boric acid, phenylboric acid, sodium tetraborate or 3-carboxyphenylboric acid; The flexible conductive layer includes 0-20% of liquid metal, 10-40% of nano-conductive material, 30-87% of resin and 3-10% of crosslinking agent, by mass percentage.

2. The flexible, stretchable and self-healing shielded wire according to claim 1, characterized in that, the liquid metal includes at least one of gallium indium alloy, gallium tin indium alloy, gallium aluminum alloy or gallium bismuth alloy, and the content is 5-20%; and / or, the nano-conductive material includes at least one of silver nanowires, silver nanoparticles, copper nanowires, copper nanoparticles, gold nanowires, gold nanoparticles, carbon nanotubes or graphene; and / or, the resin includes at least one of hydroxyl-terminated polydimethylsiloxane, hydroxyl-modified polyurethane or natural rubber; and / or, the crosslinking agent includes at least one of boric acid, phenylboric acid, sodium tetraborate or 3-carboxyphenylboric acid.

3. The flexible, stretchable and self-healing shielded wire according to claim 1, characterized in that, the flexible inner insulating layer or outer insulating layer includes 90-97% of resin and 3-10% of crosslinking agent, by mass percentage. Wherein, the resin includes at least one of hydroxyl-terminated polydimethylsiloxane, hydroxyl-modified polyurethane or natural rubber, and / or, the crosslinking agent includes at least one of boric acid, phenylboric acid, sodium tetraborate or 3-carboxyphenylboric acid.

4. A preparation method of the flexible, stretchable and self-healing shielded wire according to any one of claims 1-3, characterized in that, it includes loading the materials of the flexible conductive layer, the flexible inner insulating layer, the flexible shielding layer and the flexible outer insulating layer into syringes respectively, and performing coaxial printing to obtain the flexible, stretchable shielded self-healing wire.

5. The preparation method of the flexible, stretchable and self-healing shielded wire according to claim 4, characterized in that, heating the flexible conductive layer, the flexible inner insulating layer, the flexible shielding layer and the flexible outer insulating layer to 160-190 °C respectively, holding for 1-3 hours, then cooling to room temperature, loading the materials of each layer into syringes respectively, and performing coaxial printing, the printing speed is 0.5-100 mm / s, and the printing air pressure is 5-90 psi.

6. The preparation method of the flexible, stretchable and self-healing shielding wire according to any one of claims 1-3, characterized in that, it comprises the following steps: a. Put the flexible conductive layer material into the first mold, heat and cure it to form a shape, and then remove the first mold to obtain a formed flexible conductive layer; b. Put the formed flexible conductive layer obtained in step a into the central position of the second mold, put the flexible inner insulating layer material into the second mold, heat and cure it to form a shape, and then remove the second mold to obtain a flexible conductive layer with a flexible inner insulating layer coated on the outside; c. Put the formed flexible conductive layer with a flexible inner insulating layer coated on the outside obtained in step b into the central position of the third mold, put the flexible shielding layer material into the third mold, heat and cure it to form a shape, and then remove the third mold to obtain a flexible conductive layer with a flexible inner insulating layer and a flexible shielding layer coated in sequence from the inside to the outside; d. Put the formed flexible conductive layer with a flexible inner insulating layer and a flexible shielding layer coated in sequence from the inside to the outside obtained in step c into the central position of the fourth mold, put the flexible outer insulating layer material into the fourth mold, heat and cure it to form a shape, and then remove the fourth mold to obtain a formed flexible, stretchable and self-healing shielding wire.

7. The preparation method of the flexible, stretchable and self-healing shielding wire according to any one of claims 1-3, characterized in that, it comprises the following steps: a. Load the flexible conductive layer and the flexible inner insulating layer material into syringes respectively, and perform coaxial printing to obtain a flexible conductive layer with a flexible inner insulating layer coated on the outside; b. Put the flexible conductive layer with a flexible inner insulating layer coated on the outside obtained in step a into the central position of the first mold, put the flexible shielding layer material into the first mold, heat and cure it to form a shape, and then remove the first mold to obtain a formed flexible conductive layer with a flexible inner insulating layer and a flexible shielding layer coated in sequence from the inside to the outside; c. Put the formed flexible conductive layer with a flexible inner insulating layer and a flexible shielding layer coated in sequence from the inside to the outside obtained in step b into the central position of the second mold, put the flexible outer insulating layer material into the second mold, heat and cure it to form a shape, and then remove the second mold to obtain a formed flexible, stretchable and self-healing shielding wire.

8. The preparation method of the flexible, stretchable and self-healing shielding wire according to claim 7, characterized in that, before step a, it further comprises step aa of heating the flexible conductive layer, the flexible inner insulating layer, the flexible shielding layer and the flexible outer insulating layer materials to 160-190 °C, holding for 1-3 hours, and then cooling to room temperature; and / or, in step a, the printing speed is 0.5-100 mm / s, and the printing air pressure is 5-90 psi; and / or, in step b or c, the temperature for curing and forming is 60-120 °C, and the curing time is 10-90 minutes.

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