CN111876025A

CN111876025A - Graphene conductive ink

Info

Publication number: CN111876025A
Application number: CN202010780291.6A
Authority: CN
Inventors: 张世闯; 曾凡聪; 高金鸽; 张江; 杨亚敏; 曲勇威
Original assignee: Shenzhen Zhanwang New Material Technology Co ltd
Current assignee: Shenzhen Zhanwang New Material Technology Co ltd
Priority date: 2020-08-05
Filing date: 2020-08-05
Publication date: 2020-11-03

Abstract

The invention discloses graphene conductive ink which comprises the following raw materials in percentage by mass: 0.1-30% of graphene, 1-7% of film-forming resin, 0.1-30% of auxiliary agent and 50-99.8% of solvent, and the graphene conductive ink is different from the prior art, has outstanding cost advantage and low curing temperature, can be directly applied to materials such as fabrics and paper, is more superior in conductivity, and can be compatible with an ink-jet printing mode.

Description

Graphene conductive ink

Technical Field

The invention relates to the technical field of conductive materials, in particular to graphene conductive ink.

Background

With the rapid development of 21 st century nanotechnology, nanoscale conductive ink attracts great attention at home and abroad by virtue of high-speed industrialization of printed electronic technology, the application of the nanoscale conductive ink in the fields of radio frequency identification systems, intelligent packaging, printed circuit boards and the like is increased day by day, the traditional nano metal conductive ink is high in cost, high in curing temperature, poor in conductive performance, toxic in solvent and high in price, and cannot meet industrial production, and therefore the graphene conductive ink is provided.

Disclosure of Invention

The invention aims to provide graphene conductive ink to solve the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the graphene conductive ink comprises the following raw materials in percentage by mass: 0.1-30% of graphene, 1-7% of film-forming resin, 0.1-30% of auxiliary agent and 50-99.8% of solvent, the graphene conductive ink has outstanding cost advantage and low curing temperature, can be directly applied to materials such as fabrics and paper, is more excellent in conductivity, and can be compatible with an ink-jet printing mode.

Preferably, the graphene is prepared by performing ultrasonic treatment, filtering and centrifuging on expandable graphite, wherein the ultrasonic time is adjusted to be 5-48h according to the type of the added expandable graphite and a solvent, the mixture can be removed by filtering, graphene sheet diameters with different sizes can be separated at different rotating speeds and time in the centrifuging process, the rotating speed is 300-1000 rpm, and the time is 3-10 min.

Preferably, the film-forming resins are acrylic and epoxy acrylates.

Preferably, the auxiliaries are leveling agents and thickeners.

Preferably, the solvents are deionized water and ethanol.

Preferably, the number of the graphene layers is 1-5, wherein the single layer rate of the graphene is more than 90%, and is controlled by the time and the rotating speed of the centrifugal process.

Preferably, the graphene has a sheet diameter of 1.0 × 10³-2.5×10⁴nm²And is controlled by the time and speed of the centrifugation process.

Preferably, the conductivity of the graphene conductive ink is 3.94 × 10³-3.28×10⁴S/m。

Compared with the prior art, the invention has the beneficial effects that:

compared with the prior art, the graphene conductive ink has the advantages of outstanding cost advantage and low curing temperature, can be directly applied to materials such as fabrics and paper, is better in conductivity, and is compatible with an ink-jet printing mode, the ink prepared by the method has remarkable advantage in conductivity, and the conductivity can reach 3.28 multiplied by 10⁴S/m, the film-forming resin and the solvent used in the invention are environment-friendly, nontoxic and harmless to human bodies and environment, safe and environment-friendly, and the graphene is adopted to replace metal fillers such as silver powder and copper powder, so that the filling amount of the conductive fillers is reduced, the density of ink and a coating is reduced, and the graphene has the advantages of settlement resistance, low cost, no heavy metal pollution, no migration effect, good stability, oxidation resistance and stable conductivity under extreme environments such as acid-base high temperature and the like.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The film-forming resin is one or more of acrylic acid, modified polyurethane, polyethylene oxide, polyacrylate, ketone-aldehyde resin, epoxy acrylate and cellulose acetate butyrate, the film-forming resin is selected according to the conductivity requirement and the adhesive force requirements of different substrates, the auxiliary agent is one or more of a leveling agent, a thickening agent, a plasticizer, a thixotropic agent, an antifoaming agent, a stabilizer, a bactericide, a wetting dispersant, a coupling agent, an accelerator and a film-forming auxiliary agent, the solvent is one or more of deionized water, ethanol, butanol, isopropanol and dihydrovinyl glucose ketone, and the solvent can be selected according to different use environments of ink products.

The graphene conductive ink comprises 4% of graphene prepared after ultrasonic liquid phase stripping, filtering and centrifuging, 5% of acrylic acid, 1% of epoxy acrylate, 0.1% of a thickening agent and a leveling agent, and the proportion is 1: 1, 80% of deionized water and 9.9% of ethanol, wherein the ultrasonic time is 10h, the centrifugation is 5min, the rotating speed is 500rpm, and after coating and drying, the conductivity of the graphene conductive ink is 7.98 multiplied by 10³S/m。

Example 2

The graphene conductive ink comprises 7% of graphene prepared after ultrasonic liquid phase stripping, filtering and centrifuging, 0.1% of cellulose acetate butyrate, 3% of modified polyurethane, 0.1% of a stabilizer and a film-forming aid, wherein the ratio is 1: 1, 10% of deionized water and 79.8% of dihydrovinyl glucosone, wherein the ultrasonic time is 20h, the centrifugation is 5min, the rotating speed is 500rpm, and after coating and drying, the conductivity of the graphene conductive ink is 2.98 multiplied by 10⁴S/m。

Example 3

The graphene conductive ink comprises 10% of graphene prepared after ultrasonic liquid phase stripping, filtering and centrifuging, 5% of ketone-aldehyde resin, 1% of epoxy acrylate, 0.1% of thickening agent and 0.1% of flatting agent, wherein the ratio is 1: 1, 70% of deionized water and 13.9% of isopropanol, wherein the ultrasonic time is 15h, the centrifugation is 4min, the rotating speed is 400rpm, and after coating and drying, the conductivity of the graphene conductive ink is 3.28 multiplied by 10⁴S/m。

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The graphene conductive ink comprises the following raw materials in percentage by mass: 0.1-30% of graphene, 1-7% of film-forming resin, 0.1-30% of auxiliary agent and 50-99.8% of solvent.

2. The graphene conductive ink according to claim 1, wherein: the graphene is prepared by ultrasonically treating expandable graphite, filtering and centrifuging.

3. The graphene conductive ink according to claim 1, wherein: the film-forming resin is acrylic acid and epoxy acrylate.

4. The graphene conductive ink according to claim 1, wherein: the auxiliary agent is a leveling agent and a thickening agent.

5. The graphene conductive ink according to claim 1, wherein: the solvent is deionized water and ethanol.

6. The graphene conductive ink according to claim 1, wherein: the number of graphene layers is 1-5, wherein the single-layer rate of graphene is more than 90%.

7. The graphene conductive ink according to claim 1, wherein: the sheet diameter of the graphene is 1.0 multiplied by 10³-2.5×10⁴nm²。

8. A process according to claim 1The graphene conductive ink is characterized in that: the conductivity of the graphene conductive ink is 3.94 multiplied by 10³-3.28×10⁴S/m。