CN110136889B - Preparation method of three-dimensional stretchable conductor - Google Patents
Preparation method of three-dimensional stretchable conductor Download PDFInfo
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- CN110136889B CN110136889B CN201910435395.0A CN201910435395A CN110136889B CN 110136889 B CN110136889 B CN 110136889B CN 201910435395 A CN201910435395 A CN 201910435395A CN 110136889 B CN110136889 B CN 110136889B
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- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0026—Apparatus for manufacturing conducting or semi-conducting layers, e.g. deposition of metal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
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- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
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Abstract
The invention provides a preparation method of a three-dimensional stretchable conductor, and belongs to the technical field of elastic conductor preparation. Compared with the template compound technology, the method has the advantages of low cost, complete and defect-free pattern structure, flexible and controllable shape and plane size and the like. The conductive ink is transferred to the raised portions of the three-dimensional structure of the composite material by a flexo printing device. The elastic composite material with the three-dimensional structure has the advantages that the protruding part is reduced during stretching, so that the conductive ink attached to the protruding part of the three-dimensional structure can keep the original shape even under the stretching condition, and the excellent resistance stability is maintained. The data of the examples show that: the maximum stretching rate of the obtained three-dimensional stretchable conductor can reach 150%; the resistance is unchanged when the stretching is below 60 percent, and the resistance change is less than 10 percent after 1000 times of cyclic stretching; when the tensile strength is more than 80%, the resistance is increased by 20-50%.
Description
Technical Field
The invention relates to the technical field of elastic conductor preparation, in particular to a preparation method of a three-dimensional stretchable conductor.
Background
With the development of microelectronic technology, the traditional rigid electronic devices have been unable to meet the needs of people, and new electronic devices are beginning to develop towards flexibility and stretchability, such as smart clothes, robot skin, rollable display screen, strain sensor, stretchable light emitting device, etc. Stretchable conductors are receiving increasing attention as the core of stretchable electronics.
The key of the stretchable conductor is that the stretchable conductor still keeps stable conductivity under the deformation condition, and can be generally realized from two aspects, on one hand, conductive components with higher conductivity, including carbon nano materials, metal nano materials, conductive macromolecules and the like, are embedded into an elastomer or transferred onto the surface of an elastic substrate; another aspect is to design the conductor structure as a meandering structure, such as a wave, horseshoe, dog-leg, grid, etc. Both of these methods have certain disadvantages, however, such as limited stretchability (more than 30% tensile deformation causes a rapid decrease in conductivity), the need for special processes (photolithography, etching, pre-stretching). In recent years, it has been found that the strain of the convex portion of the elastic substrate having a three-dimensional structure under the stretching action of an external force is much smaller than that of other regions, which results in that the elastic substrate having a three-dimensional structure can endure a part of external deformation by the change of its own structure relative to a planar elastic substrate under the stretching action of the same external force. Therefore, the elastic conductor having a three-dimensional structure can improve resistance stability under tension. However, the preparation of the elastic substrate with the three-dimensional morphology is usually obtained by pouring silicone rubber compound by utilizing a three-dimensional structure template, belongs to an indirect method, and firstly obtains the template by photoetching or etching and other technologies; and the composite structure may be damaged in the re-separation process after pouring, and the structural integrity and the conductivity of the elastic conductor are finally affected.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for preparing a three-dimensional stretchable conductor, which has a complete pattern structure without defects and has excellent conductive performance under stretching deformation.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a three-dimensional stretchable conductor, which comprises the following steps:
coating the elastic photosensitive resin solution on an elastic substrate, and drying to obtain an elastic photosensitive resin layer-elastic substrate composite material; covering a film with a negative pattern above the elastic photosensitive resin layer of the elastic photosensitive resin layer-elastic substrate composite material, and carrying out ultraviolet exposure, development and drying to obtain an elastic composite material with a three-dimensional structure;
and attaching the elastic composite material with the three-dimensional structure to a flexographic printing plate cylinder, transferring the conductive ink attached to the cells on the anilox roller to the convex parts of the three-dimensional structure of the elastic composite material with the three-dimensional structure by using a flexographic printing device, and drying the ink to obtain the three-dimensional stretchable conductor.
Preferably, the material of the elastic substrate comprises polyurethane, silicon rubber, styrene-butadiene-ethylene-butylene rubber, styrene-butadiene rubber or polybutylene adipate-terephthalate.
Preferably, the pattern comprises a diamond shape, a wave shape, a horseshoe shape or a dog-leg shape.
Preferably, the time of the ultraviolet exposure is 3-10 min.
Preferably, the developing time is 5-15 min.
Preferably, the elastic photosensitive resin solution comprises the following components in parts by weight: 100 parts of high-elasticity resin, 5-50 parts of active monomer and 0.1-5 parts of initiator.
Preferably, the high-elasticity resin includes polybutadiene, polyisopiperylene, isoprene-styrene rubber, butyl rubber, ethylene propylene rubber, or styrene-butadiene rubber.
Preferably, the reactive monomer comprises an acrylate monomer.
Preferably, the height of the three-dimensional structure of the elastic composite material with the three-dimensional structure is not higher than 2/3 of the total thickness of the composite material.
Preferably, the conductive ink comprises the following components in percentage by weight: 60-70% of micron silver sheet, 2.5-5% of silver nanowire, 2.5-5% of liquid metal and 20-35% of liquid polydimethylsiloxane.
The invention provides a preparation method of a three-dimensional stretchable conductor, which comprises the following steps: coating the elastic photosensitive resin solution on an elastic substrate, and drying to obtain an elastic photosensitive resin layer-elastic substrate composite material; covering a film with a negative pattern above the elastic photosensitive resin layer of the elastic photosensitive resin layer-elastic substrate composite material, and carrying out ultraviolet exposure, development and drying to obtain an elastic composite material with a three-dimensional structure; and attaching the elastic composite material with the three-dimensional structure to a flexographic printing plate cylinder, transferring the conductive ink attached to the cells on the anilox roller to the convex parts of the three-dimensional structure of the elastic composite material with the three-dimensional structure by using a flexographic printing device, and drying the ink to obtain the three-dimensional stretchable conductor.
Compared with the current template replication technology, the method has the advantages of low cost, complete and defect-free pattern structure, flexible and adjustable pattern shape, plane size and height, and the like. Meanwhile, the conductive ink is transferred to the three-dimensional structured convex portion of the elastic composite material having the three-dimensional structure by the flexo printing apparatus. Under the same external force, the elastic composite material with the three-dimensional structure is smaller than a plane elastomer, so that the conductive ink attached to the convex part of the three-dimensional structure can keep the original appearance even under the deformation condition, and the excellent conductive performance is maintained. Namely, the three-dimensional stretchable conductor prepared by the preparation method has good resistance stability under large strain, and the resistance change is very small after multiple stretching releases. The data of the examples show that: the maximum stretching rate of the obtained three-dimensional stretchable conductor can reach 150%; the resistance is unchanged when the stretching is below 60 percent, and the resistance change is less than 10 percent after 1000 times of cyclic stretching; when the tensile strength is more than 80%, the resistance is increased by 20-50%.
Drawings
FIG. 1 is a schematic diagram of a diamond pattern with a negative pattern on a film, wherein 1 is a light-transmitting region and 2 is a non-light-transmitting region;
FIG. 2 is a schematic view of the elastic composite material having a three-dimensional structure according to the present invention, wherein 1 is an elastic base, 2 is a three-dimensional structure, and 2-1 is a convex portion of the three-dimensional structure.
Detailed Description
The invention provides a preparation method of a three-dimensional stretchable conductor, which comprises the following steps:
coating the elastic photosensitive resin solution on an elastic substrate, and drying to obtain an elastic photosensitive resin layer-elastic substrate composite material; covering a film with a negative pattern above the elastic photosensitive resin layer of the elastic photosensitive resin layer-elastic substrate composite material, and carrying out ultraviolet exposure, development and drying to obtain an elastic composite material with a three-dimensional structure;
and attaching the elastic composite material with the three-dimensional structure to a flexographic printing plate cylinder, transferring the conductive ink attached to the cells on the anilox roller to the convex parts of the three-dimensional structure of the elastic composite material with the three-dimensional structure by using a flexographic printing device, and drying the ink to obtain the three-dimensional stretchable conductor.
The invention coats elastic photosensitive resin liquid on an elastic substrate, and obtains an elastic photosensitive resin layer-elastic substrate composite material after drying; and covering a film with a negative pattern on the elastic photosensitive resin layer of the elastic photosensitive resin layer-elastic substrate composite material, and carrying out ultraviolet exposure, development and drying to obtain the elastic composite material with a three-dimensional structure.
In the present invention, the elastic photosensitive resin solution preferably comprises the following components in parts by weight: 100 parts of high-elasticity resin, 5-50 parts of active monomer and 0.1-5 parts of initiator, and further preferably comprises: 100 parts of high-elasticity resin, 10-40 parts of active monomer and 1-4 parts of initiator, and more preferably comprises the following components: 100 parts of high-elasticity resin, 20-30 parts of active monomer and 2-3 parts of initiator.
In the present invention, the highly elastic resin preferably includes polybutadiene, polyisopiperylene, isoprene-styrene rubber, butyl rubber, ethylene propylene rubber or styrene-butadiene rubber; the high-elasticity resin is synthetic rubber with elasticity. In the present invention, the reactive monomer preferably includes an acrylate monomer. In the present invention, the initiator preferably includes benzoin, benzophenone, or anthraquinone. The material source of each component in the elastic photosensitive resin solution is not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used.
In the present invention, the material of the elastic substrate preferably comprises polyurethane, silicone rubber, styrene-butadiene-ethylene-butylene rubber, styrene-butadiene rubber or polybutylene adipate-terephthalate; the thickness of the elastic base is preferably 200 μm. In the present invention, the total thickness of the elastic substrate coated with the elastic photosensitive resin solution is preferably 1500 μm.
In the invention, the drying temperature of the photosensitive resin liquid is preferably 40-70 ℃, and the time is preferably 5-30 min. The drying of the invention is only surface drying, and the film can be placed on the elastic photosensitive resin layer.
In the invention, the pattern of the film is preferably diamond-shaped, wave-shaped, horseshoe-shaped or fold line-shaped, and is further preferably diamond-shaped; the size of the pattern of the film is not particularly limited, and the film can be designed by a person skilled in the art according to the situation; in a specific embodiment of the invention, the width of the sides of the rhombus is preferably 200 μm, the sides of the rhombus are preferably 5mm, and the angle is preferably 60 °. In the present invention, the schematic diagram of the negative diamond pattern on the film is shown in fig. 1; wherein 1 is a light-transmitting area, and 2 is a non-light-transmitting area; the ultraviolet light can penetrate through the light-transmitting area of the negative pattern on the film to cure and crosslink the photosensitive resin liquid; the non-light-transmitting area can not be penetrated by ultraviolet light, so that the photosensitive resin liquid at the lower part of the light-transmitting area can not be cured and crosslinked, and finally, the uncured and crosslinked photosensitive resin liquid is removed through development; forming the final three-dimensional structure.
In the invention, the time of the ultraviolet exposure is preferably 3-10 min, more preferably 4-8 min, and even more preferably 5-6 min. In the invention, the developing time is preferably 5-15 min, and more preferably 8-10 min; the developing reagent is preferably a mixed solvent of n-butanol, tetrachloroethylene, dipropylene glycol methyl ether and diethylene glycol butyl ether acetate; the volume ratio of n-butanol, tetrachloroethylene, dipropylene glycol methyl ether and diethylene glycol butyl ether acetate in the mixed solvent is preferably 3: 4: 1: 2. in the invention, the drying temperature is preferably 40-60 ℃, and the time is preferably 5-30 min; the drying condition is set, so that the surface can be prevented from being sticky.
In the present invention, the elastic composite having a three-dimensional structure includes a three-dimensional structure and an elastic base; wherein the height of the raised portions of the three-dimensional structure cannot exceed 2/3 the total thickness of the elastic composite to avoid stretch breaking if the elastic matrix is too thin; and the higher the height of the convex part of the three-dimensional structure is, the more favorable the resistance stability in the stretching process is. In the invention, the height of the convex part of the three-dimensional structure in the elastic composite material with the three-dimensional structure is preferably 50-1000 μm.
In the present invention, a schematic view of the elastic composite material having a three-dimensional structure is shown in fig. 2, in which 1 is an elastic base, 2 is a three-dimensional structure, and 2-1 is a convex portion of the three-dimensional structure.
In the invention, because the pattern on the film is a negative image, the photoinitiator in the area which can penetrate through ultraviolet light is decomposed into free radicals to initiate the reaction of the crosslinkable high-elasticity resin and the active monomer; the area which does not penetrate through the ultraviolet light can not be subjected to crosslinking reaction and is dissolved and removed by the developing solution, so that the elastic composite material with the three-dimensional structure is obtained; wherein the three-dimensional structure pattern is preferably a diamond array, the elastic composite material with the three-dimensional structure of the diamond array has good stretchability, and the resistance change is smaller than that of other shapes under the same tensile strain.
Compared with the template replication method in the prior art, the method for preparing the elastic composite material with the three-dimensional structure by adopting the ultraviolet exposure, the development and the drying has the advantages that the preparation process of the template is omitted, the pattern structure is complete and free of defects, the pattern shape, the plane size and the height can be flexibly regulated and controlled, and the method has the characteristics of high efficiency, flexibility, convenience, low cost and large-scale preparation.
After the elastic composite material with the three-dimensional structure is obtained, the elastic composite material with the three-dimensional structure is attached to a flexographic printing plate cylinder, the conductive ink attached to the mesh holes on the anilox roller is transferred to the three-dimensional structure protruding parts of the elastic composite material with the three-dimensional structure through a flexographic printing device, and the three-dimensional stretchable conductor is obtained after the ink is dried.
In the present invention, the conductive ink preferably comprises the following components in percentage by weight: 60-70% of micron silver sheet, 2.5-5% of silver nanowire, 2.5-5% of liquid metal and 20-35% of liquid polydimethylsiloxane. In the invention, the length of the micron silver sheet is preferably 3-10 μm, and the thickness of the micron silver sheet is preferably 50-300 nm; the length of the silver nanowire is preferably 10-20 mu m, and the diameter of the silver nanowire is preferably 20-50 nm. In the present invention, the liquid metal is preferably a mixture of gallium and indium, wherein the mass ratio of gallium to indium is preferably 68.5: 21.5. the sources of the micro-nano silver sheet, the silver nanowire, the liquid metal and the liquid polydimethylsiloxane are not particularly limited, and the micro-nano silver sheet, the silver nanowire, the liquid metal and the liquid polydimethylsiloxane are commercially available products well known to those skilled in the art. The conductive ink provided by the invention has excellent conductive performance, and is beneficial to improving the conductive performance of the three-dimensional stretchable conductor.
The present invention is not particularly limited to the manner in which the elastic composite material having a three-dimensional structure is attached to the flexographic printing plate cylinder, as long as the elastic base side of the elastic composite material having a three-dimensional structure can be attached to the flexographic printing plate cylinder. The present invention does not specifically limit the manner in which the conductive ink adheres to the cells on the anilox roller, as long as the conductive ink adheres to the cells on the anilox roller. In the invention, the mesh number of the anilox roller is preferably 300-600 meshes; the material of the anilox roller is preferably ceramic. The present invention is not particularly limited to the flexo printing apparatus, and may be a flexo printing apparatus well known to those skilled in the art.
In the invention, the drying temperature of the conductive ink is preferably 100-120 ℃, and the time is preferably 20-40 min. The drying temperature of the conductive ink of the present invention fixes the conductive ink to the three-dimensional structure convex portion of the elastic composite material having a three-dimensional structure.
The invention enables the conductive ink to be accurately transferred from the anilox roller to the three-dimensional structure convex part (the concave part has no ink) of the elastic composite material with the three-dimensional structure through the flexo printing equipment.
The following examples are provided to illustrate the preparation of the three-dimensional stretchable conductor of the present invention in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
1) Coating an elastic photosensitive resin solution containing 100 parts of polybutadiene, 2 parts of benzophenone initiator and 20 parts of acrylate monomer on a polyurethane substrate (the thickness of the polyurethane substrate is 200 mu m, and the thickness of the coating is 1300 mu m), and drying at 40 ℃ for 30min to obtain an elastic photosensitive resin layer-elastic substrate composite material with the total thickness of 1500 mu m; covering a film with a negative diamond pattern on an elastic photosensitive resin layer of the elastic photosensitive resin layer-elastic substrate composite material, and carrying out ultraviolet exposure for 3min, developing for 5min and drying at 40 ℃ for 30min to obtain an elastic composite material with a three-dimensional structure; wherein the height of the convex part of the three-dimensional structure in the elastic composite material with the three-dimensional structure is 50 mu m, the width of the diamond-shaped side is 200 mu m, and the side length of the diamond is 5 mm;
2) attaching one side of an elastic substrate of an elastic composite material with a three-dimensional structure to a flexographic plate cylinder, and applying conductive ink (the conductive ink comprises the following components in percentage by weight: 60 parts of micron silver sheets (the length is 3 mu m, the thickness is 50nm), 2.5 parts of silver nanowires (the length is 10 mu m, the diameter is 20nm), 2.5 parts of liquid metal and 35 parts of liquid polydimethylsiloxane) are uniformly coated on a 600-mesh anilox roller, conductive ink is accurately transferred to a three-dimensional structure protruding part of an elastic composite material with a three-dimensional structure from a mesh hole on the anilox roller through a flexo printing device, and the three-dimensional stretchable conductor is obtained after drying for 40min at 100 ℃.
And (3) stretching and deforming the three-dimensional conductor by adopting a stretching machine, recording the original length before stretching and the length after stretching, and taking the ratio of the difference value of the original length before stretching and the length before stretching as the stretching deformation rate. Simultaneously, the printed conductive pattern and the universal meter test lead wire are connected through a thin copper wire, the contact resistance is reduced at the connecting part of the copper wire and the pattern through conductive silver paste, and resistance change in the stretching process is tested through the universal meter. The cycle test was: and (3) repeatedly stretching under certain deformation, and then testing the resistance before and after stretching, wherein the ratio of the difference value of the resistance before stretching and the resistance before stretching is the resistance change rate.
The results were: the maximum stretching deformation rate of the three-dimensional stretchable conductor obtained in the embodiment can reach 80%, the resistance is not changed when the conductor is stretched by less than 40%, and the resistance change rate is less than 10% after the conductor is stretched for 1000 times in a circulating manner; at 80% stretch, the resistance increases by 50%.
Example 2
1) Coating an elastic photosensitive resin solution containing 100 parts of polyisoprene, 2 parts of anthraquinone and 50 parts of acrylate monomer on a silicon rubber substrate (the thickness of the silicon rubber substrate is 200 mu m, and the thickness of the coating is 1300 mu m), and drying at 70 ℃ for 5min to obtain an elastic photosensitive resin layer-elastic substrate composite material; covering a film with a negative diamond pattern on an elastic photosensitive resin layer of the elastic photosensitive resin layer-elastic substrate composite material, and carrying out ultraviolet exposure for 10min, developing for 15min and drying at 60 ℃ for 5min to obtain an elastic composite material with a three-dimensional structure; wherein the height of the convex part of the three-dimensional structure in the elastic composite material with the three-dimensional structure is 1000 mu m, the width of the diamond-shaped side is 200 mu m, and the side length of the diamond is 5 mm;
2) attaching one side of an elastic substrate of an elastic composite material with a three-dimensional structure to a flexographic plate cylinder, and applying conductive ink (the conductive ink comprises the following components in percentage by weight: 70 parts of micron silver sheets (with the length of 10 mu m and the thickness of 300nm), 5 parts of silver nanowires (with the length of 20 mu m and the diameter of 50nm), 5 parts of liquid metal and 20 parts of liquid polydimethylsiloxane) are uniformly coated on a 600-mesh anilox roller, conductive ink is accurately transferred from the anilox roller to a three-dimensional structure convex part of an elastic composite material with a three-dimensional structure through a flexo printing device, and the three-dimensional stretchable conductor is obtained after drying for 20min at 120 ℃.
The performance of the three-dimensional stretchable conductor obtained in this example was tested by the method of example 1, and the results were: the maximum stretching rate of the three-dimensional stretchable conductor obtained by the embodiment can reach 150%, the resistance is not changed when the conductor is stretched by less than 60%, and the resistance change is less than 10% after the conductor is stretched for 1000 times in a circulating manner; at 80% stretch, the resistance increases by 20%; when the stretching is 100% or more, the electric resistance increases by 50%.
Example 3
1) Coating an elastic photosensitive resin solution containing 100 parts of isoprene-styrene rubber, 2 parts of benzoin and 30 parts of acrylate monomers on a styrene-butadiene rubber substrate (the thickness of the styrene-butadiene rubber substrate is 200 mu m, and the thickness of the coating is 1300 mu m), and drying at 50 ℃ for 15min to obtain an elastic photosensitive resin layer-elastic substrate composite material; covering a film with a negative diamond pattern on an elastic photosensitive resin layer of the elastic photosensitive resin layer-elastic substrate composite material, and carrying out ultraviolet exposure for 6min, development for 10min and drying at 50 ℃ for 15min to obtain an elastic composite material with a three-dimensional structure; wherein the height of the convex part of the three-dimensional structure in the elastic composite material with the three-dimensional structure is 700 mu m, the width of the diamond-shaped side is 200 mu m, and the side length of the diamond is 5 mm;
2) attaching one side of an elastic substrate of an elastic composite material with a three-dimensional structure to a flexographic plate cylinder, and applying conductive ink (the conductive ink comprises the following components in percentage by weight: 65 parts of micron silver sheets (with the length of 6 microns and the thickness of 150nm), 3.5 parts of silver nanowires (with the length of 15 microns and the diameter of 35nm), 3.5 parts of liquid metal and 28 parts of liquid polydimethylsiloxane) are uniformly coated on a 600-mesh anilox roller, conductive ink is accurately transferred from the anilox roller to a three-dimensional structure protruding part of an elastic composite material with a three-dimensional structure through a flexo printing device, and the three-dimensional stretchable conductor is obtained after drying for 30min at 110 ℃.
The performance of the three-dimensional stretchable conductor obtained in this example was tested using the test method of example 1, and the results were: the maximum stretching rate of the three-dimensional stretchable conductor obtained by the embodiment can reach 100%, the resistance is not changed when the conductor is stretched by less than 50%, and the resistance change is less than 10% after the conductor is stretched for 1000 times in a circulating manner; at 80% stretch, the resistance increases by 40%; at 90% stretch, the resistance increases by 50%.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A method of making a three-dimensional stretchable conductor, comprising the steps of:
coating the elastic photosensitive resin solution on an elastic substrate, and drying to obtain an elastic photosensitive resin layer-elastic substrate composite material; covering a film with a negative pattern above the elastic photosensitive resin layer of the elastic photosensitive resin layer-elastic substrate composite material, and carrying out ultraviolet exposure, development and drying to obtain an elastic composite material with a three-dimensional structure;
attaching the elastic composite material with the three-dimensional structure to a flexographic printing plate cylinder, transferring the conductive ink attached to the cells on the anilox roller to the convex part of the three-dimensional structure of the elastic composite material with the three-dimensional structure through a flexographic printing device, and drying the ink to obtain the three-dimensional stretchable conductor;
the ultraviolet exposure time is 3-10 min;
the developing time is 5-15 min.
2. The method of claim 1, wherein the elastic substrate comprises polyurethane, silicone rubber, styrene-butadiene-ethylene-butylene rubber, styrene-butadiene rubber, or polybutylene adipate-terephthalate.
3. The method of making a three-dimensional stretchable conductor according to claim 1, wherein the pattern comprises a diamond shape, a wave shape, a horseshoe shape, or a dogleg shape.
4. The method for preparing a three-dimensional stretchable conductor according to claim 1, wherein the elastic photosensitive resin solution comprises the following components in parts by weight: 100 parts of high-elasticity resin, 5-50 parts of active monomer and 0.1-5 parts of initiator.
5. The method of making a three-dimensional stretchable conductor according to claim 4, characterized in that the high-elasticity resin comprises polybutadiene, polyisopiperylene, isoprene-styrene rubber, butyl rubber, ethylene propylene rubber or styrene-butadiene rubber.
6. The method of making a three-dimensional stretchable conductor of claim 4, wherein the reactive monomer comprises an acrylate monomer.
7. The method of preparing a three-dimensional stretchable conductor according to claim 1, wherein the height of the convex portion of the three-dimensional structure in the elastic composite material having a three-dimensional structure cannot be greater than 2/3 of the total thickness of the composite material.
8. The method of making a three-dimensional stretchable conductor according to claim 1, wherein the conductive ink comprises the following components in weight percent: 60-70% of micron silver sheet, 2.5-5% of silver nanowire, 2.5-5% of liquid metal and 20-35% of liquid polydimethylsiloxane.
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Effective date of registration: 20221021 Address after: No. 6, Gaodian Road, Xiamen Area, Xiamen Pilot Free Trade Zone, Fujian Province, 361011 Patentee after: 3D Printing (Xiamen) New Materials Co.,Ltd. Address before: 102699 Daxing District Xinghua street, Beijing (two paragraph) 1 Patentee before: BEIJING INSTITUTE OF GRAPHIC COMMUNICATION |