CN-121991549-A - MXene-based composite ink for electromagnetic shielding and infrared stealth and preparation method thereof

Abstract

The invention discloses an MXene-based composite ink for electromagnetic shielding and infrared stealth and a preparation method thereof. The composite ink consists of an MXene nano-sheet, an auxiliary agent and a solvent, and can be prepared into a composite film through a corresponding coating process or combined with a matrix material to form a composite coating. The MXene-based composite ink prepared by the invention has good processability, excellent electromagnetic shielding and infrared stealth performance, simple and convenient preparation process and low cost, and is suitable for large-scale production.

Inventors

• LI JIAN
• JIANG YANG
• ZHU HONGTAO
• QIN ZHIKANG
• WANG ZIXUN
• ZHONG HONGHAI
• TONG GUOQING

Assignees

• 合肥工业大学

Dates

Publication Date

20260508

Application Date

20260319

Claims (10)

1. 1. The MXene-based composite ink for electromagnetic shielding and infrared stealth is characterized in that the solid content of the composite ink is 1-50mg/mL, the composite ink consists of MXene nano-sheets, an auxiliary agent and a solvent, the auxiliary agent is one or more of sodium carboxymethyl cellulose, yellow gelatin, sodium alginate, silk fibroin and bacterial cellulose, and the mass ratio of the MXene nano-sheets to the auxiliary agent is 1-4:1.
2. 2. The MXene-based composite ink for electromagnetic shielding and infrared stealth according to claim 1, wherein the MXene nano-sheets have a single-layer and/or a few-layer MXene structure and are selected from one or more of Ti 3 C 2 T x 、Ti 2 CT x 、V 2 CT x 、Nb 2 CT x 、Nb 4 C 3 T x .
3. 3. The MXene-based composite ink for electromagnetic shielding and infrared stealth according to claim 1, wherein the solvent is one or a mixture of several of deionized water, ethanol, methanol and acetone.
4. 4. A process for preparing the composite ink of MXene base for electromagnetic shielding and infrared stealth as set forth in any one of claims 1-3, wherein the composite ink of MXene base is prepared by mixing MXene nanosheets, auxiliary agent and solvent, stirring, ultrasonic or vacuum ball milling to form stable dispersion liquid.
5. 5. Use of an MXene-based composite ink for electromagnetic shielding and infrared camouflage according to any one of the claims 1 to 3, characterised in that it comprises the following steps: S1, coating MXene-based composite ink on the surface of a matrix material; And S2, drying the substrate material coated with the composite ink, and peeling off the coating from the substrate material after drying to obtain the MXene-based composite film.
6. 6. The method according to claim 5, wherein in the step S1, the substrate is one of polyetherimide, polypropylene film, polytetrafluoroethylene film and polyethylene film, and the coating mode is one of screen printing, doctor blade coating, dip coating and spray coating.
7. 7. The method according to claim 5, wherein in step S2, the drying is performed at a temperature of 50-150 ℃ for 30-120min.
8. 8. Use of an MXene-based composite ink for electromagnetic shielding and infrared camouflage according to any one of the claims 1 to 3, characterised in that it comprises the following steps: Y1, coating MXene-based composite ink on the surface of a matrix material; And Y2, drying the matrix material coated with the composite ink to obtain the matrix material with the MXene-based composite coating.
9. 9. The method of claim 8, wherein in step Y1, the substrate is one of nylon, glass, copper foil, cotton cloth, and paper, and the coating method is one of screen printing, doctor blade coating, dip coating, and spray coating.
10. 10. The method according to claim 8, wherein in step Y2, the drying is carried out at a temperature of 50-150 ℃ for a period of 30-120min.

Description

MXene-based composite ink for electromagnetic shielding and infrared stealth and preparation method thereof Technical Field The invention relates to the field of electromagnetic shielding materials, in particular to MXene-based composite ink for electromagnetic shielding and infrared stealth and a preparation method thereof. Background With the rapid development of electronic information technology, electromagnetic waves (EMW) are widely used in the fields of communication, medical treatment, military, consumer electronics, etc., and the problem of electromagnetic interference (EMI) caused by the EMW is becoming serious while greatly improving the social production and living standard. Electromagnetic interference not only causes signal distortion, abnormal operation and even system failure of electronic equipment, but also can generate potential harm to organisms through thermal effect and nonthermal effect. Long-term in high-intensity electromagnetic environment, may cause neurasthenia, memory deterioration, cardiovascular dysfunction and other health risks. Meanwhile, the infrared detection technology is widely applied to the fields of military reconnaissance, civil security and the like, so that the infrared stealth performance becomes a key index of an electronic system. In order to meet the dual-function requirements of electromagnetic shielding and infrared stealth, the multifunctional integrated composite material with excellent electromagnetic interference shielding performance and infrared stealth characteristics has become an important research direction in the fields of material science, electronic engineering and national defense application intersection. In recent years, two-dimensional layered materials MXene represented by transition metal carbide and nitride show great application potential in the fields of electromagnetic shielding, infrared stealth, energy storage, catalysis and the like by virtue of high conductivity, rich surface functional groups, adjustable layered structure and excellent molding processability, and become a research hotspot at home and abroad. Among them, ti 3C2Tx as a typical MXene material exhibits excellent electromagnetic shielding and infrared stealth effects. However, pure MXene film still has many bottlenecks in practical application, such as easy oxidation in air, weak interlayer binding force, easy swelling, easy secondary electromagnetic pollution caused by too high electromagnetic wave reflection ratio, and the like, and meanwhile, the large-scale preparation and molding processing of the pure MXene film still face technical limitations. Therefore, the comprehensive performance and engineering application level of the MXene-based material are improved through composite modification, interface optimization and structural design, and the method has become a key technical problem to be solved urgently in the field. Disclosure of Invention The invention aims to solve the technical problems of poor service performance, easy oxidation of MXene, insufficient adhesion force between the ink and a matrix and the like of the existing MXene-based ink, and provides an MXene-based composite ink for electromagnetic shielding and infrared stealth, a preparation method and application thereof. In order to achieve the above object, the present invention adopts the following technical scheme: The invention firstly provides an MXene-based composite ink for electromagnetic shielding and infrared stealth, the solid content of which is 1-50mg/mL, which consists of an MXene nanosheet, an auxiliary agent and a solvent, wherein the specific requirements of the components are as follows: The MXene nano-sheet is of a single-layer and/or few-layer structure, one or more of Ti3C2Tx、Ti2CTx、V2CTx、Nb2CTx、Nb4C3Tx can be selected as the auxiliary agent, one or more of sodium carboxymethyl cellulose, yellow gelatin, sodium alginate, silk fibroin and bacterial cellulose can be selected as the auxiliary agent, the mass ratio of the MXene nano-sheet to the auxiliary agent is controlled to be 1-4:1, one or more of deionized water, ethanol, methanol and acetone can be selected as the solvent, the good dispersibility, rheological property and film forming property of the ink can be ensured, and the ink is suitable for the subsequent coating process. The preparation method of the MXene-based composite ink comprises the steps of mixing the MXene nanosheets, the auxiliary agent and the solvent according to corresponding proportion, and performing treatment by any one or more combination processes of stirring, ultrasonic or vacuum ball milling to form a dispersion liquid with uniform dispersion and good stability, wherein the dispersion liquid is the MXene-based composite ink. The preparation method comprises the steps of adding sodium carboxymethyl cellulose into deionized water, stirring and dissolving to prepare sodium carboxymethyl cellulose solution, dripping the solution into MXene nanosheets, u