CN112778840A - Conductive ink and preparation method thereof - Google Patents
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- CN112778840A CN112778840A CN202110096058.0A CN202110096058A CN112778840A CN 112778840 A CN112778840 A CN 112778840A CN 202110096058 A CN202110096058 A CN 202110096058A CN 112778840 A CN112778840 A CN 112778840A
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- 238000002360 preparation method Methods 0.000 title abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 90
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 85
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 85
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims abstract description 56
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims abstract description 56
- 239000006185 dispersion Substances 0.000 claims abstract description 30
- 230000000694 effects Effects 0.000 claims abstract description 10
- 239000003960 organic solvent Substances 0.000 claims description 29
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 27
- 229920002635 polyurethane Polymers 0.000 claims description 12
- 239000004814 polyurethane Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000002109 single walled nanotube Substances 0.000 claims description 9
- 125000003118 aryl group Chemical group 0.000 claims description 8
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 6
- 125000001931 aliphatic group Chemical group 0.000 claims description 5
- 239000002079 double walled nanotube Substances 0.000 claims description 5
- 239000002048 multi walled nanotube Substances 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 230000002776 aggregation Effects 0.000 abstract description 11
- 238000004220 aggregation Methods 0.000 abstract description 10
- 239000002270 dispersing agent Substances 0.000 abstract description 9
- 230000007774 longterm Effects 0.000 abstract description 8
- 238000004062 sedimentation Methods 0.000 abstract description 7
- 239000012752 auxiliary agent Substances 0.000 abstract description 3
- 239000000976 ink Substances 0.000 description 84
- 238000005119 centrifugation Methods 0.000 description 8
- 238000000703 high-speed centrifugation Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 239000011231 conductive filler Substances 0.000 description 4
- 229910021389 graphene Inorganic materials 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 229920001940 conductive polymer Polymers 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 2
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/52—Electrically conductive inks
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
- C09D11/033—Printing inks characterised by features other than the chemical nature of the binder characterised by the solvent
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Conductive Materials (AREA)
Abstract
The invention discloses conductive ink and a preparation method thereof. According to the invention, thermoplastic polyurethane is used as a dispersing agent of the carbon nano tube, and the prepared conductive ink has the advantages of single formula component, low cost, good dispersing effect and excellent long-term stability through simple high-speed dispersion and centrifugal treatment, and the concentration of the conductive ink can hardly change when the conductive ink is placed at room temperature for more than 30 days, and the aggregation and sedimentation phenomena of the carbon nano tube can not occur. The conductive ink disclosed by the invention does not need to be additionally added with other auxiliary agents, and can ensure that the ink has good conductivity.
Description
Technical Field
The invention relates to the technical field of conductive ink, in particular to conductive ink and a preparation method thereof.
Background
The conductive ink can be printed on various non-conductive substrates to form specific printed circuits with excellent conductive properties. The conductive ink is generally mainly composed of a conductive filler, an auxiliary agent, and a solvent, wherein the conductive filler can be generally classified into three types, i.e., metal conductive particles, inorganic carbon-based materials, and organic conductive polymers. The metal particles have the problems of easy oxidation failure, complex processing technology and the like, and the conductive polymer has the problems of poor conductivity, high cost and the like.
Carbon-based materials commonly used to prepare conductive inks primarily comprise graphite and carbon black, as well as the emerging nanoparticles graphene and carbon nanotubes. The carbon nano tube is a one-dimensional nano material with a tubular structure, and has good electrical property because the structure of the carbon nano tube is the same as that of a graphite lamellar structure. Through the development of the last thirty years, the industrialization of the carbon nano tube is quite mature, and compared with the graphene with a complex preparation process, the graphene has lower cost. Therefore, carbon nanotubes have greater potential as conductive fillers in the popularization of conductive inks. However, the carbon nanotubes have strong intermolecular force and a large aspect ratio, are easily aggregated and difficult to uniformly disperse, and greatly weaken the conductivity uniformity, thereby limiting the practical application thereof. In order to improve the dispersibility of the carbon nanotubes in the conductive ink, the prior art generally carries out chemical modification on the carbon nanotubes, adds various different surfactants, dispersing agents and other components, and often needs to undergo processes such as ultrasonic treatment and pulverization for a long time. The former has a great influence on the conductivity of the conductive ink, and the latter greatly increases the economic cost. In addition, after the conductive ink is placed for a long time, the conductive filler is prone to aggregation and sedimentation.
Based on the current situation of the existing conductive ink and the preparation process thereof, it is necessary to develop a conductive ink with simple formula components, simple dispersion process and good long-term stability.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the conductive ink which has the advantages of single formula component, lower cost, simple dispersion treatment process, good dispersion effect and better long-term stability, and can be placed at room temperature for a longer time without aggregation and sedimentation of the carbon nano tubes.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the conductive ink comprises carbon nano tubes, thermoplastic polyurethane and an organic solvent, wherein the concentration of the carbon nano tubes in the conductive ink is 2-40mg/ml, and the concentration of the thermoplastic polyurethane is 2-40 mg/ml.
The invention uses thermoplastic polyurethane as the dispersant of the carbon nano tube, the prepared conductive ink has single formula component, lower cost, simple dispersing treatment process, good dispersing effect and better long-term stability, and can be placed for a longer time (more than one month) at room temperature without aggregation and sedimentation of the carbon nano tube.
According to the conductive ink, other additives such as a dispersing agent, a stabilizing agent, a protective agent and a surfactant are not required to be additionally added, so that the conductive ink can be ensured to have good dispersibility and stability, and the phenomenon that the addition of the additives brings great influence on the conductivity of the ink is avoided.
Preferably, the conductive ink consists of carbon nanotubes, thermoplastic polyurethane and an organic solvent, and the prepared ink has good conductivity, good dispersion effect and good long-term stability, and the concentration of the ink is hardly changed even standing for 30 days at room temperature, and the aggregation and sedimentation phenomena of the carbon nanotubes cannot occur.
Preferably, the carbon nanotube is at least one of a single-walled carbon nanotube, a double-walled carbon nanotube, and a multi-walled carbon nanotube.
Preferably, the thermoplastic polyurethane is an aliphatic or aromatic polyurethane, the thermoplastic polyurethane having a molecular weight of from 1 to 50 kilodaltons. The molecular weight of the thermoplastic polyurethane is too small (less than 1 ten thousand), the molecular chain is too short, and the carbon nano tubes cannot be well dispersed and the movement aggregation of the carbon nano tubes cannot be inhibited; and if the molecular weight is too large (more than 50 ten thousand), the polyurethane is difficult to dissolve, the solution viscosity is increased, and the difficulty of uniform mixing is increased.
Preferably, the organic solvent is at least one of N, N-dimethylformamide and N, N-dimethylacetamide.
The invention also provides a preparation method of the conductive ink, which is characterized by comprising the following steps:
(1) mixing the carbon nano tube, the thermoplastic polyurethane and the organic solvent, wherein the concentration of the carbon nano tube in the mixed ink is 5-50mg/ml, and the concentration of the thermoplastic polyurethane is 5-50 mg/ml;
(2) performing dispersion treatment on the ink mixed in the step (1), wherein the rotating speed is 10000-;
(3) and (3) centrifuging the ink dispersed in the step (2), wherein the rotating speed is 5000-10000rpm, the centrifuging time is 2-10min, and removing the carbon nano tubes which are not fixed by the thermoplastic polyurethane to obtain the conductive ink with the carbon nano tube concentration of 2-40mg/ml and the thermoplastic polyurethane concentration of 2-40 mg/ml.
According to the invention, the thermoplastic polyurethane is used as the dispersing agent of the carbon nano tube, the thermoplastic polyurethane and the organic solvent are mixed, and then the conductive ink can be obtained through high-speed dispersion and centrifugal treatment, and complex and tedious process treatment is not needed, so that the production efficiency is improved, and the cost is reduced.
In the above preparation method, the inventors found through a plurality of experiments that:
(1) too low a concentration of carbon nanotubes (less than 5mg/ml) results in too low conductivity of the ink, while too high a concentration of carbon nanotubes results in a problem of non-uniform dispersion. Too low polyurethane concentration can not disperse carbon nanotubes well and inhibit the movement aggregation of the carbon nanotubes, while too high polyurethane concentration can cause difficulty in dissolution, increase the solution viscosity and increase the difficulty in uniform mixing.
(2) The rotational speed and the dispersing time in the dispersing process together determine the initial dispersing effect. The rotating speed is too low, and the dispersing time is too short, so that the dispersing effect is poor, and the aggregation phenomenon is obvious; too high rotation speed and too long dispersion time can cause serious solution heating, cause agglomeration of the carbon nanotubes and influence the dispersion effect.
(3) The rotating speed is too slow and the centrifugal time is too short in the centrifugal treatment, so that the agglomerated carbon nano tubes cannot be completely centrifuged out of the liquid, and the dispersed carbon nano tubes are centrifugally settled and reduced due to the too fast rotating speed and the too long centrifugal time, so that the concentration of the carbon nano tubes in the ink is reduced.
Therefore, the invention ensures that the prepared conductive ink has good dispersibility and excellent long-term stability performance by optimizing the concentration of the carbon nano tube and the thermoplastic polyurethane, and relevant process parameters of dispersion and centrifugation treatment.
The invention also provides application of the thermoplastic polyurethane in improving the dispersion effect and stability of the conductive ink, wherein the conductive ink comprises carbon nano tubes, thermoplastic polyurethane and an organic solvent, the concentration of the carbon nano tubes in the conductive ink is 2-40mg/ml, and the concentration of the thermoplastic polyurethane is 2-40 mg/ml.
The inventor tests and finds that in the conductive ink formula system, the thermoplastic polyurethane can be used as a dispersing agent to effectively improve the dispersing effect and stability of the conductive ink.
Preferably, in the above application, the carbon nanotube is at least one of a single-walled carbon nanotube, a double-walled carbon nanotube and a multi-walled carbon nanotube.
Preferably, in the above application, the thermoplastic polyurethane is an aliphatic or aromatic polyurethane, the thermoplastic polyurethane having a molecular weight of from 1 to 50 kilodalton.
Preferably, in the above application, the organic solvent is at least one of N, N-dimethylformamide and N, N-dimethylacetamide.
Compared with the prior art, the invention has the beneficial effects that:
(1) the conductive ink disclosed by the invention is added with the carbon nano tube, the thermoplastic polyurethane and the organic solvent, other auxiliary agents are not required to be additionally added, the formula components are single, the cost is lower, and the good conductivity of the ink can be ensured.
(2) The preparation process of the conductive ink is simple, the conductive ink can be obtained by high-speed dispersion and centrifugal treatment after the carbon nano tube, the thermoplastic polyurethane and the organic solvent are mixed, complex and tedious process treatment is not needed, and certain time and economic cost can be saved.
(3) The conductive ink prepared by the invention has excellent dispersibility and long-term stability, and the concentration of the conductive ink is almost unchanged and the aggregation and sedimentation phenomena of the carbon nano tubes can not occur after the conductive ink is stood for 30 days at room temperature.
Drawings
FIG. 1 is a flow chart of the process for preparing the conductive ink of the present invention.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples. It will be understood by those skilled in the art that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the examples, the experimental methods used were all conventional methods unless otherwise specified, and the materials, reagents and the like used were commercially available without otherwise specified.
Example 1
The preparation method of the conductive ink of the embodiment is shown in fig. 1, and includes the following steps:
(1) mixing carbon nano tubes, thermoplastic polyurethane and an organic solvent, wherein the concentration of the carbon nano tubes in the mixed ink is 20mg/ml, and the carbon nano tubes are single-walled carbon nano tubes; the concentration of the thermoplastic polyurethane is 20mg/ml, the thermoplastic polyurethane is aromatic polyurethane, and the molecular weight is 1 ten thousand to 50 ten thousand daltons; the organic solvent is N, N-dimethylformamide;
(2) performing high-speed dispersion treatment on the ink mixed in the step (1), wherein the rotating speed is 20000rpm, and the dispersion time is 3 h;
(3) and (3) carrying out high-speed centrifugation treatment on the ink dispersed in the step (2), wherein the rotation speed is 10000rpm, and the centrifugation time is 5min, and removing the carbon nano tubes which are not fixed by the thermoplastic polyurethane to obtain the conductive ink.
Example 2
The preparation method of the conductive ink of the embodiment is shown in fig. 1, and includes the following steps:
(1) mixing carbon nano tubes, thermoplastic polyurethane and an organic solvent, wherein the concentration of the carbon nano tubes in the mixed ink is 50mg/ml, and the carbon nano tubes are single-walled carbon nano tubes; the concentration of the thermoplastic polyurethane is 50mg/ml, the thermoplastic polyurethane is aromatic polyurethane, and the molecular weight is 1 ten thousand to 50 ten thousand daltons; the organic solvent is N, N-dimethylformamide;
(2) performing high-speed dispersion treatment on the ink mixed in the step (1), wherein the rotating speed is 30000rpm, and the dispersion time is 1 h;
(3) and (3) carrying out high-speed centrifugation treatment on the ink dispersed in the step (2), wherein the rotating speed is 5000rpm, the centrifugation time is 10min, and removing the carbon nano tubes which are not fixed by the thermoplastic polyurethane to obtain the conductive ink.
Example 3
The preparation method of the conductive ink of the embodiment is shown in fig. 1, and includes the following steps:
(1) mixing carbon nano tubes, thermoplastic polyurethane and an organic solvent, wherein the concentration of the carbon nano tubes in the mixed ink is 5mg/ml, and the carbon nano tubes are single-walled carbon nano tubes; the concentration of the thermoplastic polyurethane is 5mg/ml, the thermoplastic polyurethane is aromatic polyurethane, and the molecular weight is 1 ten thousand to 50 ten thousand daltons; the organic solvent is N, N-dimethylformamide;
(2) performing high-speed dispersion treatment on the ink mixed in the step (1), wherein the rotating speed is 10000rpm, and the dispersion time is 5 h;
(3) and (3) carrying out high-speed centrifugation treatment on the ink dispersed in the step (2), wherein the rotation speed is 10000rpm, and the centrifugation time is 2min, and removing the carbon nano tubes which are not fixed by the thermoplastic polyurethane to obtain the conductive ink.
Example 4
The preparation method of the conductive ink of the embodiment is shown in fig. 1, and includes the following steps:
(1) mixing carbon nano tubes, thermoplastic polyurethane and an organic solvent, wherein the concentration of the carbon nano tubes in the mixed ink is 10mg/ml, and the carbon nano tubes are double-wall carbon nano tubes; the concentration of the thermoplastic polyurethane is 40mg/ml, the thermoplastic polyurethane is aromatic polyurethane, and the molecular weight is 1 ten thousand to 50 ten thousand daltons; the organic solvent is N, N-dimethylacetamide;
(2) performing high-speed dispersion treatment on the ink mixed in the step (1), wherein the rotating speed is 20000rpm, and the dispersion time is 3 h;
(3) and (3) carrying out high-speed centrifugation treatment on the ink dispersed in the step (2), wherein the rotation speed is 10000rpm, and the centrifugation time is 5min, and removing the carbon nano tubes which are not fixed by the thermoplastic polyurethane to obtain the conductive ink.
Example 5
The preparation method of the conductive ink of the embodiment is shown in fig. 1, and includes the following steps:
(1) mixing carbon nano tubes, thermoplastic polyurethane and an organic solvent, wherein the concentration of the carbon nano tubes in the mixed ink is 20mg/ml, and the carbon nano tubes are multi-walled carbon nano tubes; the concentration of the thermoplastic polyurethane is 20mg/ml, the thermoplastic polyurethane is aliphatic polyurethane, and the molecular weight is 1 ten thousand to 50 ten thousand daltons; the organic solvent is N, N-dimethylacetamide;
(2) performing high-speed dispersion treatment on the ink mixed in the step (1), wherein the rotating speed is 20000rpm, and the dispersion time is 3 h;
(3) and (3) carrying out high-speed centrifugation treatment on the ink dispersed in the step (2), wherein the rotation speed is 10000rpm, and the centrifugation time is 5min, and removing the carbon nano tubes which are not fixed by the thermoplastic polyurethane to obtain the conductive ink.
Comparative example 1
The method for preparing the conductive ink of the comparative example includes the steps of:
(1) mixing carbon nanotubes, polyvinylpyrrolidone resin and an organic solvent, wherein the concentration of the carbon nanotubes in the mixed ink is 20mg/ml, and the carbon nanotubes are single-walled carbon nanotubes; the concentration of the polyvinylpyrrolidone resin is 20 mg/ml; the organic solvent is N, N-dimethylformamide;
(2) performing high-speed dispersion treatment on the ink mixed in the step (1), wherein the rotating speed is 20000rpm, and the dispersion time is 3 h;
(3) and (3) carrying out high-speed centrifugation treatment on the ink dispersed in the step (2), wherein the rotation speed is 10000rpm, and the centrifugation time is 5min, and removing the carbon nano tubes which are not fixed by the resin to obtain the conductive ink.
Comparative example 2
The method for preparing the conductive ink of the comparative example includes the steps of:
(1) mixing carbon nanotubes, polyethylene glycol and an organic solvent, wherein the concentration of the carbon nanotubes in the mixed ink is 20mg/ml, and the carbon nanotubes are single-walled carbon nanotubes; the concentration of the polyethylene glycol is 20 mg/ml; the organic solvent is N, N-dimethylformamide;
(2) performing high-speed dispersion treatment on the ink mixed in the step (1), wherein the rotating speed is 20000rpm, and the dispersion time is 3 h;
(3) and (3) carrying out high-speed centrifugation treatment on the ink dispersed in the step (2), wherein the rotation speed is 10000rpm, and the centrifugation time is 5min, and removing the carbon nano tubes which are not covered to obtain the conductive ink.
After the prepared ink is kept stand at room temperature for different time, the concentrations of the carbon nano tube and the dispersant in the ink are measured, and the specific test method comprises the following steps:
the calibration curve of concentration versus absorbance (at 600 nm) was determined using a predetermined amount of carbon nanotube dispersion. Then, the absorbance of the different solutions at 600nm was measured, and the concentration of the carbon nanotubes was obtained by a standard curve. And taking the solution to be detected, and removing the solvent to obtain the total solid content concentration. The concentration of the dispersing agent can be obtained by subtracting the concentration of the carbon nano tubes from the concentration of the total solid content.
TABLE 1 variation of carbon nanotube and dispersant concentrations over time (d: day) in the inks
Compared with comparative examples 1-2, the inks prepared in examples 1-5 have better long-term stability, and the concentration of the inks is almost unchanged and aggregation and sedimentation phenomena of the carbon nanotubes are not generated after standing for 30 days at room temperature.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The conductive ink is characterized by comprising carbon nano tubes, thermoplastic polyurethane and an organic solvent, wherein the concentration of the carbon nano tubes in the conductive ink is 2-40mg/ml, and the concentration of the thermoplastic polyurethane is 2-40 mg/ml.
2. The conductive ink of claim 1, wherein the conductive ink is comprised of carbon nanotubes, thermoplastic polyurethane, and an organic solvent.
3. The conductive ink of claim 1, wherein the carbon nanotubes are at least one of single-walled carbon nanotubes, double-walled carbon nanotubes, and multi-walled carbon nanotubes.
4. The conductive ink of claim 1, wherein the thermoplastic polyurethane is an aliphatic or aromatic polyurethane and the thermoplastic polyurethane has a molecular weight of 1 to 50 kilodaltons.
5. The conductive ink of claim 1, wherein the organic solvent is at least one of N, N-dimethylformamide and N, N-dimethylacetamide.
6. The method of preparing the conductive ink of any one of claims 1 to 5, comprising the steps of:
(1) mixing the carbon nano tube, the thermoplastic polyurethane and the organic solvent, wherein the concentration of the carbon nano tube in the mixed ink is 5-50mg/ml, and the concentration of the thermoplastic polyurethane is 5-50 mg/ml;
(2) performing dispersion treatment on the ink mixed in the step (1), wherein the rotating speed is 10000-;
(3) and (3) centrifuging the ink dispersed in the step (2), wherein the rotating speed is 5000-10000rpm, the centrifuging time is 2-10min, and removing the carbon nano tubes which are not fixed by the thermoplastic polyurethane to obtain the conductive ink with the carbon nano tube concentration of 2-40mg/ml and the thermoplastic polyurethane concentration of 2-40 mg/ml.
7. The application of the thermoplastic polyurethane in improving the dispersion effect and stability of the conductive ink is characterized in that the conductive ink comprises carbon nano tubes, thermoplastic polyurethane and an organic solvent, wherein the concentration of the carbon nano tubes in the conductive ink is 2-40mg/ml, and the concentration of the thermoplastic polyurethane is 2-40 mg/ml.
8. The use of claim 7, wherein the carbon nanotubes are at least one of single-walled carbon nanotubes, double-walled carbon nanotubes and multi-walled carbon nanotubes.
9. Use according to claim 7, wherein the thermoplastic polyurethane is an aliphatic or aromatic polyurethane having a molecular weight of from 1 to 50 kilodalton.
10. The use according to claim 7, wherein the organic solvent is at least one of N, N-dimethylformamide and N, N-dimethylacetamide.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2826691C1 (en) * | 2024-05-27 | 2024-09-16 | Общество с ограниченной ответственностью "БОДИХИТ" | Resistive conductive paste |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500120A (en) * | 2020-04-23 | 2020-08-07 | 东华大学 | Nano carbon conductive ink suitable for fabric screen printing and preparation method thereof |
| CN111564236A (en) * | 2020-04-28 | 2020-08-21 | 清华大学 | Conductive paste, preparation method and preparation method of conductive film |
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- 2021-01-25 CN CN202110096058.0A patent/CN112778840A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500120A (en) * | 2020-04-23 | 2020-08-07 | 东华大学 | Nano carbon conductive ink suitable for fabric screen printing and preparation method thereof |
| CN111564236A (en) * | 2020-04-28 | 2020-08-21 | 清华大学 | Conductive paste, preparation method and preparation method of conductive film |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2826691C1 (en) * | 2024-05-27 | 2024-09-16 | Общество с ограниченной ответственностью "БОДИХИТ" | Resistive conductive paste |
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