CN113990557A - Preparation method and application of elastomer with high conductivity and high stretchability - Google Patents
Preparation method and application of elastomer with high conductivity and high stretchability Download PDFInfo
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 86
- 239000000806 elastomer Substances 0.000 title claims abstract description 86
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 68
- 229910001338 liquidmetal Inorganic materials 0.000 claims abstract description 62
- 239000000843 powder Substances 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 39
- 238000002156 mixing Methods 0.000 claims abstract description 36
- 238000000498 ball milling Methods 0.000 claims abstract description 29
- 239000002905 metal composite material Substances 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000001035 drying Methods 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 18
- 210000004177 elastic tissue Anatomy 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 239000011159 matrix material Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 21
- 229910021389 graphene Inorganic materials 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 229910052709 silver Inorganic materials 0.000 claims description 11
- 239000004332 silver Substances 0.000 claims description 11
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 10
- 229910052733 gallium Inorganic materials 0.000 claims description 10
- 229910052738 indium Inorganic materials 0.000 claims description 10
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 8
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 7
- 229910000846 In alloy Inorganic materials 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 239000000741 silica gel Substances 0.000 claims description 6
- 229910002027 silica gel Inorganic materials 0.000 claims description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- PFRUBEOIWWEFOL-UHFFFAOYSA-N [N].[S] Chemical compound [N].[S] PFRUBEOIWWEFOL-UHFFFAOYSA-N 0.000 claims description 3
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 3
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims description 3
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 13
- 238000000465 moulding Methods 0.000 abstract description 5
- 238000003756 stirring Methods 0.000 description 17
- 238000010907 mechanical stirring Methods 0.000 description 11
- 239000002131 composite material Substances 0.000 description 10
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- 238000001878 scanning electron micrograph Methods 0.000 description 3
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- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 239000002105 nanoparticle Substances 0.000 description 1
- 239000013110 organic ligand Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/16—Non-insulated conductors or conductive bodies characterised by their form comprising conductive material in insulating or poorly conductive material, e.g. conductive rubber
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
- H01R13/22—Contacts for co-operating by abutting
- H01R13/24—Contacts for co-operating by abutting resilient; resiliently-mounted
Abstract
The invention provides a preparation method of an elastomer with high conductivity and high stretchability. Firstly, nano silver powder, graphene derivatives and liquid metal are mixed according to the mass ratio of (0.3-0.6): (0.1-0.2): 1, mixing, and performing ball milling to obtain nano silver powder-graphene-liquid metal composite conductive powder A; secondly, mixing the elastomer matrix and the curing agent to obtain an elastomer material; and finally, mixing the nano silver powder-graphene-liquid metal composite conductive powder A and the elastomer material, pouring the mixture into a mold for molding, and drying to obtain the nano silver powder-graphene-liquid metal conductive elastomer B with high conductivity and high stretchability. The method is simple in preparation, can be used for batch preparation, and does not need additional treatment; meanwhile, the nano silver powder-graphene-liquid metal conductive elastomer B prepared by the method can be prepared into a flexible robot electric connector and can be used for an electronic circuit connecting part, an elastic fiber or an electrically stretchable part of a flexible robot.
Description
Technical Field
The invention relates to the technical field of electronic material preparation and device processing, in particular to a preparation method and application of a high-conductivity and high-stretchability elastomer.
Background
In recent years, electronic information technology has been developed, and electronic devices have been miniaturized and light-weighted. Highly conductive elastomer composites have received much attention due to their good flexibility and large deformation. The nano silver particles can effectively improve the conductivity of the composite material as a high-conductivity material, however, the conductivity is obviously reduced and the impedance is obviously increased (the electrical stability is poor) in the stretching process due to the small content and the uneven dispersion of the conductive filler, and the high-conductivity elastomer composite material using the nano silver particles as the conductive filler still has certain limitation.
At present, high-elasticity-modulus and high-conductivity particles such as nano silver, graphene and carbon nanotubes are widely used as a conductive medium to prepare conductive ink, and then electronic circuits are printed by means of screen printing or ink-jet printing. However, the preparation of conductive inks with metals (copper, silver, etc.) and carbon-based (graphene, carbon nanotubes, etc.) as conductive media has the following disadvantages: high elastic modulus, low elongation at break and no good stretchability. The room temperature liquid metal material represented by gallium and gallium-based alloy has excellent electrical properties superior to those of the conventional electronic material, and is expected to be applied to printing of high-performance electronic circuits. However, the liquid metal has huge surface energy, and the surface of the liquid metal is spontaneously formed into an insulating oxide film, so that the printing and poor electrical conductivity of the liquid metal on various substrates are always the main technical problems of the materials. Meanwhile, conductive elastomers prepared using liquid metals have also been reported for flexible electronic circuits, but liquid metals are only simply attached in elastomers, and their stretchability and conductivity are still to be further improved.
Therefore, the preparation method of the elastomer with high conductivity and high stretchability can obtain the composite conductive powder with high conductivity by a simple ball milling mode, and the composite conductive powder is used for preparing the conductive elastomer. Meanwhile, the method is simple to operate, can be used for batch preparation, and does not need an additional treatment process. In addition, the conductive elastomer prepared by the method can meet the application requirements of civil fields such as wearable electronics, electronic skins, intelligent sensing and robots.
Disclosure of Invention
Based on the technical problems in the prior art, the invention aims to provide a preparation method of a high-conductivity and high-stretchability elastomer, which can obtain high-conductivity composite conductive powder by a simple ball milling mode, and then prepare the conductive elastomer after mixing with the elastomer. The method is simple to operate, can be used for batch preparation, and does not need an additional treatment process. In addition, the conductive elastomer prepared by the method has high elasticity and high conductivity, can bear tensile deformation in the wearing process, can be more flexibly connected with electronic elements and applied to a flexible carrier, and can be used for manufacturing a flexible robot electric connector, an electronic circuit connecting part of a flexible robot, an elastic fiber or an electrically stretchable part by using the nano silver powder-graphene-liquid metal conductive elastomer B.
The specific technical scheme is as follows:
(1) the preparation method comprises the following steps of (1) mixing nano silver powder, graphene derivatives and liquid metal according to a mass ratio of (0.3-0.6): (0.1-0.2): 1, mixing, and performing ball milling to obtain nano silver powder-graphene-liquid metal composite conductive powder A, wherein the ball milling rotation speed is 1,000-3,000 rpm, the ball milling time is 6-12 h, and vacuumizing and argon filling are performed once every 1 h before and during the ball milling; the silver powder-graphene-liquid metal composite conductive powder A can generate organic gas in the preparation process, and needs to be removed in time to avoid oxidizing the liquid metal.
(2) Uniformly mixing the elastomer matrix and the curing agent according to equal mass ratio or equal volume ratio to obtain an elastomer material; the mixing can be carried out by mechanical stirring at a speed of 300-1,000 rpm for 20-60 min.
(3) Mixing the nano silver powder-graphene-liquid metal composite conductive powder A and the elastomer material according to the weight ratio of (0.05-0.5): 1, uniformly mixing, pouring into a mould for forming, and drying to obtain a nano silver powder-graphene-liquid metal conductive elastomer B with high conductivity and high stretchability; the mixing can be carried out by adopting a mechanical stirring mode, wherein the mechanical stirring speed is 300-1,000 rpm, the stirring time is 15-60 min, the drying temperature is 50-180 ℃, and the drying time is 20-60 min.
The silver solid content in the nano silver powder is more than 99%, and the particle size is less than 300 nm. The organic ligand on the surface of the nano silver powder volatilizes in the high-speed stirring process and oxidizes liquid metal, so that the conductivity of the nano silver powder-graphene-liquid metal composite conductive powder A is reduced, and the nano silver powder with high silver solid content is required to be used.
The liquid metal is one or more of Ga-In and Ga-In-Zn alloy. The mass ratio of metal gallium to metal indium In the Ga-In alloy is 1: (0.3-0.5), wherein the mass ratio of metal gallium, metal indium and metal zinc In the Ga-In-Zn alloy is 1: (0.3-0.4): (0.05-0.2).
The particle size of the nano silver powder-graphene-liquid metal composite conductive powder A is 0.5-500 mu m.
The graphene derivative comprises graphene oxide, reduced graphene oxide, nitrogen-doped graphene, sulfur-doped graphene and nitrogen-sulfur co-doped graphene.
The elastomer comprises one or more of epoxy insulating glue, elastic silica gel, PDMS, platinum cured silica gel Ecoflex00-30 and polyurethane PU.
The nano silver powder-graphene-liquid metal conductive elastomer B can be made into a flexible robot electric connector and can be used for an electronic circuit connecting part, an elastic fiber or an electric stretching part of a flexible robot.
The stretching rate of the electric connector is 200% -1,000%, and the resistance of the stretched electric connector is 0.1-100 omega.
The invention has the beneficial effects that: by designing and preparing the preparation method of the elastomer with high conductivity and high stretchability, the high-conductivity composite conductive powder can be obtained by a simple ball milling mode, and the conductive elastomer is prepared after the high-conductivity composite conductive powder is mixed with the elastomer. The method is simple to operate, can be used for batch preparation, and does not need an additional treatment process. In addition, the nano silver powder-graphene-liquid metal conductive elastomer B prepared by the method has high conductivity, and the nano silver powder-graphene-liquid metal powder A is filled in the elastomer to enhance the stretchability of the elastomer and the conductivity of the elastomer after being stretched. Therefore, the nano silver powder-graphene-liquid metal conductive elastomer B can be used for preparing a flexible robot electric connector and can be used for an electronic circuit connecting part, an elastic fiber or an electric stretching part of a flexible robot.
Drawings
Fig. 1 is an SEM image of the silver nanoparticle powder-graphene-liquid metal composite conductive powder a in example 1 of the present invention;
FIG. 2 is an SEM image of a conductive elastomer prepared using only a nano silver powder and a liquid metal composite conductive powder in comparative example 1 of the present invention;
fig. 3 is an SEM image of the conductive elastomer prepared using only the graphene and liquid metal composite conductive powder in comparative example 2 of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments and the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the prior art, the conductive elastomer doped material has the problems of poor conductivity after the nano silver powder is stretched, strong stretching but poor conductivity of the graphene derivative, poor adhesion of liquid metal and the like. In order to solve the problems, the invention provides a preparation method of a high-conductivity and high-stretchability elastomer, which can obtain high-conductivity composite conductive powder by a simple ball milling mode, and then prepare the conductive elastomer after mixing with the elastomer. The method is simple to operate, can be used for batch preparation, and does not need an additional treatment process. In addition, the conductive elastomer prepared by the method has high elasticity and high conductivity, can bear tensile deformation in the wearing process, can be more flexibly connected with electronic elements and applied to a flexible carrier, and can be used for manufacturing a flexible robot electric connector, an electronic circuit connecting part of a flexible robot, an elastic fiber or an electrically stretchable part by using the nano silver powder-graphene-liquid metal conductive elastomer B.
Example 1
A method for preparing a high-conductivity and high-stretchability elastomer, comprising:
(1) mixing nano silver powder, nitrogen-doped graphene and liquid metal Ga-In alloy according to the mass ratio of 0.3: 0.2: 1, mixing, and performing ball milling to obtain nano silver powder-graphene-liquid metal composite conductive powder A, wherein the ball milling rotation speed is 1,500rpm, the ball milling time is 6 hours, and vacuumizing and argon filling are performed once every 1 hour before and during the ball milling;
(2) mixing the elastomer matrix epoxy insulating adhesive and the curing agent according to equal mass ratio, and mechanically stirring uniformly to obtain an elastomer material; wherein the mechanical stirring speed is 800 rpm, and the stirring time is 35 min;
(3) mixing the nano silver powder-graphene-liquid metal composite conductive powder A and the elastomer material according to the weight ratio of 0.05: 1, mixing, pouring the mixture into a mold for molding after mechanically stirring the mixture evenly, and drying the mixture to obtain the elastomer with high conductivity and high stretchability; wherein the mechanical stirring speed is 300 rpm, the stirring time is 45 min, the drying temperature is 150 ℃, and the drying time is 40 min.
The silver solid content in the nano silver powder is more than 99%, and the particle size is less than 300 nm.
The mass ratio of metal gallium to metal indium In the Ga-In alloy is 1: 0.5.
the particle size of the nano silver powder-graphene-liquid metal composite conductive powder A is 5-50 μm.
The prepared nano silver powder-graphene-liquid metal conductive elastomer B can be prepared into an elastic electric connector of a flexible robot and can be used for an electronic circuit connecting part of the flexible robot. The elongation of the electric connector was 1,000%, and the electric connector resistance after stretching was 0.1 Ω.
Example 2
A method for preparing a high-conductivity and high-stretchability elastomer, comprising:
(1) mixing nano silver powder, graphene oxide and liquid metal Ga-In-Zn alloy according to the mass ratio of 0.6: 0.1: 1, mixing, and performing ball milling to obtain nano silver powder-graphene-liquid metal composite conductive powder A, wherein the ball milling rotation speed is 1,000 rpm, the ball milling time is 12 hours, and vacuumizing and argon filling are performed once every 1 hour before and during the ball milling;
(2) mixing the elastomer matrix elastic silica gel and the curing agent according to an equal volume ratio, and mechanically stirring uniformly to obtain an elastomer material; wherein the mechanical stirring speed is 600 rpm, and the stirring time is 60 min;
(3) mixing nano silver powder-graphene-liquid metal composite conductive powder A and an elastomer material according to the weight ratio of 0.2: 1, mixing, pouring the mixture into a mold for molding after mechanically stirring the mixture evenly, and drying the mixture to obtain the elastomer with high conductivity and high stretchability; wherein the mechanical stirring speed is 1,000 rpm, the stirring time is 30 min, the drying temperature is 50 ℃, and the drying time is 60 min.
The silver solid content in the nano silver powder is more than 99%, and the particle size is less than 300 nm.
The mass ratio of metal gallium to metal indium to metal zinc In the Ga-In-Zn alloy is 1: 0.3: 0.2.
the particle size of the nano silver powder-graphene-liquid metal composite conductive powder A is 0.5-500 mu m.
The prepared nano silver powder-graphene-liquid metal conductive elastomer B can be prepared into a flexible robot electric connector and can be used for elastic fibers of a flexible robot. The elongation of the electric connector was 950%, and the electric connector resistance after stretching was 8 Ω.
Example 3
A method for preparing a high-conductivity and high-stretchability elastomer, comprising:
(1) nano silver powder, nitrogen-sulfur co-doped graphene and liquid metal Ga-In alloy according to the mass ratio of 0.3: 0.1: 1, mixing, and performing ball milling to obtain nano silver powder-graphene-liquid metal composite conductive powder A, wherein the ball milling rotation speed is 2,200 rpm, the ball milling time is 10 hours, and vacuumizing and argon filling are performed once every 1 hour before and during the ball milling;
(2) mixing the elastomer matrix PDMS and the curing agent according to an equal mass ratio, and mechanically stirring uniformly to obtain an elastomer material; wherein the mechanical stirring speed is 1,000 rpm, and the stirring time is 50 min;
(3) mixing the nano silver powder-graphene-liquid metal composite conductive powder A and the elastomer material according to the weight ratio of 0.5: 1, mixing, pouring the mixture into a mold for molding after mechanically stirring the mixture evenly, and drying the mixture to obtain the elastomer with high conductivity and high stretchability; wherein the mechanical stirring speed is 600 rpm, the stirring time is 60 min, the drying temperature is 100 ℃, and the drying time is 30 min.
The silver solid content in the nano silver powder is more than 99%, and the particle size is less than 300 nm.
The mass ratio of metal gallium to metal indium In the Ga-In alloy is 1: 0.3.
the particle size of the nano silver powder-graphene-liquid metal composite conductive powder A is 0.5-500 mu m.
The prepared nano silver powder-graphene-liquid metal conductive elastomer B can be prepared into a flexible robot electric connector and can be used for an electric-driven stretchable component of a flexible robot. The elongation of the electric connector was 800%, and the electric connector resistance after stretching was 12 Ω.
Example 4
A method for preparing a high-conductivity and high-stretchability elastomer, comprising:
(1) mixing nano silver powder, reduced graphene oxide and liquid metal Ga-In-Zn alloy according to the mass ratio of 0.6: 0.2: 1, mixing, and performing ball milling to obtain nano silver powder-graphene-liquid metal composite conductive powder A, wherein the ball milling rotation speed is 3,000 rpm, the ball milling time is 8 hours, and vacuumizing and argon filling are performed once every 1 hour before and during the ball milling;
(2) mixing the platinum curing silica gel and the curing agent of the elastomer matrix according to an equal volume ratio, and mechanically stirring uniformly to obtain an elastomer material; wherein the mechanical stirring speed is 300 rpm, and the stirring time is 20 min;
(3) mixing the nano silver powder-graphene-liquid metal composite conductive powder A and the elastomer material according to the weight ratio of 0.4: 1, mixing, pouring the mixture into a mold for molding after mechanically stirring the mixture evenly, and drying the mixture to obtain the elastomer with high conductivity and high stretchability; wherein the mechanical stirring speed is 800 rpm, the stirring time is 15 min, the drying temperature is 180 ℃, and the drying time is 20 min.
The silver solid content in the nano silver powder is more than 99%, and the particle size is less than 300 nm.
The mass ratio of metal gallium to metal indium to metal zinc In the Ga-In-Zn alloy is 1: 0.4: 0.05.
the particle size of the nano silver powder-graphene-liquid metal composite conductive powder A is 0.5-500 mu m.
The prepared nano silver powder-graphene-liquid metal conductive elastomer B can be prepared into a flexible robot electric connector, the tensile rate of the electric connector is 500%, and the resistance of the stretched electric connector is 50 omega.
Comparative example 1
The technical scheme of the embodiment 1 is changed as follows: the conductive elastomer is prepared only from the composite material of the nano silver powder and the liquid metal, the tensile rate of the electric connector is 150%, and the requirement of an electronic circuit connecting part of the flexible robot on the tensile property cannot be met.
Comparative example 2
The technical scheme of the embodiment 1 is changed as follows: the conductive elastomer is prepared only from the graphene and liquid metal composite material, and the resistance of the stretched electric connector is 3M omega, so that the requirement of an electronic circuit connecting part of a flexible robot on the conductive performance cannot be met.
From the above, the nano silver powder-graphene-liquid metal composite conductive powder A prepared by the embodiment of the invention has high conductivity and excellent rheological property, and can be mixed with an elastomer to prepare a conductive elastomer. The method is simple to operate, can be used for batch preparation, and does not need an additional treatment process. Meanwhile, the conductive elastomer prepared by the method has high elasticity and high conductivity, can bear tensile deformation in the wearing process, can be more flexibly connected with electronic elements and applied to a flexible carrier, and can be used for manufacturing a flexible robot electric connector, an electronic circuit connecting part of a flexible robot, an elastic fiber or an electrically stretchable part by using the nano silver powder-graphene-liquid metal conductive elastomer B.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A method for preparing a high-conductivity and high-stretchability elastomer, comprising:
(1) the preparation method comprises the following steps of (1) mixing nano silver powder, graphene derivatives and liquid metal according to a mass ratio of (0.3-0.6): (0.1-0.2): 1, mixing, and performing ball milling to obtain nano silver powder-graphene-liquid metal composite conductive powder A, wherein the ball milling rotation speed is 1,000-3,000 rpm, the ball milling time is 6-12 h, and vacuumizing and argon filling are performed once every 1 h before and during the ball milling;
(2) uniformly mixing the elastomer matrix and the curing agent according to equal mass ratio or equal volume ratio to obtain an elastomer material;
(3) mixing the nano silver powder-graphene-liquid metal composite conductive powder A and the elastomer material according to the weight ratio of (0.05-0.5): 1, uniformly mixing, pouring into a mould for forming, and drying to obtain the nano silver powder-graphene-liquid metal conductive elastomer B with high conductivity and high stretchability, wherein the drying temperature is 50-180 ℃, and the drying time is 20-60 min.
2. The method for preparing elastomer with high conductivity and high stretchability as claimed in claim 1, wherein said silver nanoparticles have a silver solid content of more than 99% and a particle size of less than 300 nm.
3. The method for preparing the elastomer with high conductivity and high stretchability as claimed In claim 1, wherein said liquid metal is one or more of Ga-In and Ga-In-Zn alloy; the mass ratio of metal gallium to metal indium In the Ga-In alloy is 1: (0.3-0.5), wherein the mass ratio of metal gallium, metal indium and metal zinc In the Ga-In-Zn alloy is 1: (0.3-0.4): (0.05-0.2).
4. The method for preparing the elastomer with high conductivity and high stretchability as claimed in claim 1, wherein the particle size of the silver nanopowder-graphene-liquid metal composite conductive powder A is in the range of 0.5 μm to 500 μm.
5. The method for preparing the elastomer with high conductivity and high stretchability as claimed in claim 1, wherein the graphene derivative comprises graphene oxide, reduced graphene oxide, nitrogen-doped graphene, sulfur-doped graphene, and nitrogen-sulfur co-doped graphene.
6. The method for preparing the elastomer with high conductivity and high stretchability as claimed in claim 1, wherein the elastomer material comprises one or more of epoxy insulating glue, elastic silica gel, PDMS, platinum cured silica gel and polyurethane PU.
7. The use of the high conductivity and high tensile elastomer prepared by the method of any one of claims 1 to 6, wherein the nano silver powder-graphene-liquid metal conductive elastomer B can be made into a flexible robot electric connector, and can be used for an electronic circuit connecting part, an elastic fiber or an electrically stretchable part of a flexible robot.
8. The use of claim 7 wherein the electrical connector has a stretchability of 200% to 1,000% and a tensile electrical connector resistance of 0.1 to 100 Ω.
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