CN113773597B - Electromagnetic shielding material with self-repairing function and preparation method and application thereof - Google Patents
Electromagnetic shielding material with self-repairing function and preparation method and application thereof Download PDFInfo
- Publication number
- CN113773597B CN113773597B CN202111055299.7A CN202111055299A CN113773597B CN 113773597 B CN113773597 B CN 113773597B CN 202111055299 A CN202111055299 A CN 202111055299A CN 113773597 B CN113773597 B CN 113773597B
- Authority
- CN
- China
- Prior art keywords
- electromagnetic shielding
- water
- shielding material
- polyacrylic acid
- carbon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
Abstract
The invention provides an electromagnetic shielding material with a self-repairing function, and a preparation method and application thereof, wherein the preparation raw materials of the electromagnetic shielding material comprise polyacrylic acid, calcium chloride, water-soluble polymers, carbon materials and water-soluble carbonate; the amorphous calcium carbonate, the polyacrylic acid and the water-soluble polymer can be used together as a matrix to form hydrogel, so that the carbon material is dispersed in the matrix to form a conductive network, the obtained material is ensured to have a self-repairing function and simultaneously endowed with excellent electromagnetic shielding performance, and finally the composite material with excellent self-repairing and electromagnetic shielding performance is obtained.
Description
Technical Field
The invention belongs to the technical field of electromagnetic shielding materials, and particularly relates to an electromagnetic shielding material with a self-repairing function, and a preparation method and application thereof.
Background
The rapid development of wireless communication technology and intelligent electronic equipment brings convenience to life of people, and simultaneously, the problem of electromagnetic radiation pollution which cannot be ignored is also generated, and adverse effects are brought to equipment performance, human health and surrounding environment. Particularly, along with commercialization of 5G networks and Internet of things products, the problem of electromagnetic wave pollution is increasingly prominent, and development of high-performance electromagnetic shielding materials is very important for eliminating electromagnetic radiation leakage, so that normal operation of 5G communication, automatic driving, remote medical operation, industrial remote control and precise electronic products is ensured. The conventional metal material becomes the first choice of the current electromagnetic shielding material due to the excellent conductivity, but the metal material has the defects of poor mechanical flexibility, difficult processing, easy corrosion, high density and the like, and is limited in application in the aerospace and next-generation intelligent electronic fields, so that the development of a novel shielding material for replacing the conventional metal is imperative.
At present, carbon-based shielding materials prepared from graphene, carbon nanotubes, carbon fibers, activated carbon and the like have the advantages of light weight, corrosion resistance, adjustable performance and the like, are favored by researchers, are substitute materials of traditional electromagnetic shielding materials, and are developed into carbon-based polymer composite materials, carbon aerogel materials, carbon film materials and the like successively.
CN110408337a discloses a method for preparing an electromagnetic shielding tape modified by aerogel containing elastic carbon, which comprises the following steps: adding resorcinol and nano fibers into formaldehyde aqueous solution, and adding sodium carbonate to obtain aerogel precursor solution; coating the aerogel precursor solution on the surface of a metal copper foil, heating and curing, introducing carbon dioxide, heating and drying, and carbonizing at high temperature to obtain an elastic carbon aerogel modified copper foil; stirring and drying resorcinol-formaldehyde aerogel precursor solution in a carbon dioxide atmosphere, and carbonizing at a high temperature to obtain carbon aerogel powder; mixing polyacrylate with purified carbon aerogel powder, a curing agent and a dispersing agent to obtain a carbon-based polyacrylate conductive pressure-sensitive adhesive; coating a carbon-based polyacrylate conductive pressure-sensitive adhesive on the surface of the conductive cloth, and heating and curing to prepare a double-sided conductive adhesive tape; and finally, pressing and laminating the elastic carbon aerogel-containing modified electromagnetic shielding adhesive tape with a release film and an elastic carbon aerogel-containing modified copper foil to prepare the elastic carbon aerogel-containing modified electromagnetic shielding adhesive tape.
CN113120879a discloses a carbon aerogel material, and a preparation method and application thereof, wherein the carbon aerogel material is prepared by mixing a nanocellulose-graphene oxide aqueous dispersion liquid with a polymethyl methacrylate solution to obtain a nanocellulose-stabilized oil-in-water Pickering emulsion; freezing to obtain the nano cellulose-graphene oxide/polymethyl methacrylate composite aerogel; and annealing to obtain the carbon aerogel material. The carbon aerogel material with the three-dimensional structure prepared by the invention has high compressive strain, excellent fatigue resistance, excellent electromagnetic shielding performance and biological sensing performance, and wide application prospect in the fields of flexible sensors and electromagnetic interference shielding.
CN109763210a discloses a method for preparing cellulose-based carbon fiber or carbon film from ionic liquid. Taking the ionic liquid as a solvent to efficiently dissolve cellulose and simultaneously disperse the carbon nanomaterial to obtain an ionic liquid-cellulose-carbon nanocomposite solution; spinning or scraping the composite solution to prepare conductive fibers or conductive films; further preparing the high-conductivity cellulose-based carbon fiber or carbon film through pre-oxidation and carbonization treatment. The method has the advantages of simple process, abundant cellulose sources, low price, environment-friendly and recyclable ionic liquid, and the addition of the carbon nano tube, the graphene and the conductive carbon black in the cellulose matrix greatly improves the conductivity of the carbon fiber or the carbon film, can be applied to the fields of antistatic textiles, electric heating clothes, electromagnetic shielding fabrics and the like, and has wide application prospect.
Currently, this approach is directed to improving the electromagnetic shielding properties of materials in a manner that increases the conductivity of the material, although to some extent, effectively reduces the material thickness. However, methods for increasing the conductivity of materials often involve extremely high heat treatment operating temperatures, such as 2500-3000 ℃, which greatly increases the difficulty of preparing the materials. In addition, once the existing electromagnetic shielding material is molded, the existing electromagnetic shielding material cannot be edited, remodelled or recycled, does not have the inherent self-healing capability like a biological built-in repair system, is easy to damage and often needs to be replaced at intervals, any damage such as cutting injury and crack can cause leakage of electromagnetic waves, and the electromagnetic shielding performance and the application safety and reliability of the material are seriously affected.
Therefore, developing an electromagnetic shielding material with a self-repairing function becomes a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an electromagnetic shielding material with a self-repairing function, a preparation method and application thereof, wherein the preparation raw materials of the electromagnetic shielding material comprise polyacrylic acid, calcium chloride, water-soluble polymers, carbon materials and water-soluble carbonates, and the polyacrylic acid, amorphous calcium carbonate and water-soluble polymers are taken as matrixes, and the carbon materials are dispersed in the matrixes, so that the electromagnetic shielding material with excellent electromagnetic shielding performance and self-repairing function is successfully obtained.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, the present invention provides an electromagnetic shielding material with a self-repairing function, wherein the electromagnetic shielding material is prepared from a combination of polyacrylic acid, calcium chloride, a water-soluble polymer, a carbon material and a water-soluble carbonate.
The preparation raw materials of the electromagnetic shielding material with the self-repairing function comprise polyacrylic acid, calcium chloride, water-soluble polymers, carbon materials and water-soluble carbonates, wherein the calcium chloride can react with the water-soluble carbonates to form amorphous calcium carbonate, the polyacrylic acid and the water-soluble polymers are taken as a matrix together, the carbon materials are dispersed in the matrix to form a conductive network, excellent conductivity is provided for the material, and finally the composite material with the excellent self-repairing function and the electromagnetic shielding performance is obtained.
Preferably, the molecular weight of the polyacrylic acid is 1000 to 100000g/mol, for example 2000g/mol, 5000g/mol, 7000g/mol, 10000g/mol, 30000g/mol, 50000g/mol, 70000g/mol or 90000g/mol, etc., more preferably 2000 to 5000g/mol.
As a preferable technical scheme of the invention, the molecular weight of the polyacrylic acid in the invention needs to be kept in the range of 1000-100000 g/mol to obtain the electromagnetic shielding material with excellent performance; on the one hand, if the molecular weight of the polyacrylic acid is lower than 1000g/mol, the polyacrylic acid has poor viscoelasticity with the hydrogel formed by mineralization of amorphous calcium carbonate due to the shorter length of the polyacrylic acid chain, has strong fluidity, cannot keep a fixed shape, even cannot form the hydrogel, and is easy to be redispersed in water; on the other hand, if the molecular weight of the polyacrylic acid is higher than 100000g/mol, the chain length of the polyacrylic acid is too long, so that the binding property with amorphous calcium carbonate is poor, the binding force between polyacrylic acid molecules is also poor, the formed hydrogel is seriously pulverized, cannot be deformed and remolded at will, and the self-repairing function is lost.
Preferably, the water-soluble polymer comprises any one or a combination of at least two of polyvinyl alcohol, polyacrylamide, chitosan, carboxymethyl cellulose salt, carboxymethyl cellulose, alginate, methyl cellulose, gelatin, dextran or agarose.
Preferably, the mass ratio of the water-soluble polymer to the polyacrylic acid is (0.1 to 10): 100, for example, 0.3:100, 0.5:100, 0.7:100, 0.9:100, 1:100, 3:100, 5:100, 7:100, or 9:100, etc., and more preferably (0.5 to 5): 100.
As a preferable technical scheme of the invention, in the invention, the mass ratio of the water-soluble polymer to the polyacrylic acid is required to be kept in the range of (0.1-10): 100, so that the obtained material has excellent self-repairing function; on the one hand, if the added water-soluble polymer is too small, the viscoelastic capability for improving the cross-linked network of polyacrylic acid and amorphous calcium carbonate is insufficient, the formed hydrogel has low viscosity and high fluidity, and cannot keep a fixed shape; on the other hand, if the added water-soluble polymer is too much, the cross-linked network of polyacrylic acid and calcium carbonate is easily damaged, so that the hydrogel is seriously pulverized, the capacity of random deformation and remodeling is lost, and the self-repairing function of the material is further lost.
Preferably, the molar ratio of calcium chloride to polyacrylic acid is 1 (0.5-1.5), such as 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, or 1:1.4, etc.
Preferably, the carbon material includes any one or a combination of at least two of graphene, carbon nanotubes, carbon black, activated carbon and porous carbon, and further preferably graphene.
Preferably, the mass ratio of the carbon material to the polyacrylic acid is (1 to 20): 100, for example, 2:100, 4:100, 6:100, 8:100, 10:100, 12:100, 14:100, 16:100, 18:100, or the like, and further preferably (1 to 10): 100.
As a preferable technical scheme of the invention, in the invention, the mass ratio of the carbon material to the polyacrylic acid is required to be kept in the range of (1-20): 100 so as to obtain the material with excellent electromagnetic shielding performance and self-repairing function; on the one hand, when the content of the carbon material is low, an effective conductive network cannot be constructed in the matrix, the conductivity of the material is poor, and the electromagnetic shielding performance is low; when the dosage of the carbon material is too large, the excessive carbon material easily damages the crosslinked network of polyacrylic acid, amorphous calcium carbonate and water-soluble polymer, so that the formed hydrogel is seriously pulverized and loses any deformation, remodelling and self-repairing functions.
Preferably, the water-soluble carbonate comprises any one or a combination of at least two of sodium carbonate, potassium carbonate and ammonium carbonate, and further preferably sodium carbonate.
In a second aspect, the present invention provides a method for producing the electromagnetic shielding material according to the first aspect, the method comprising the steps of:
(1) Dispersing polyacrylic acid, calcium chloride, water-soluble polymer and carbon material in water to obtain a mixed solution;
(2) And (3) adding the water solution of the water-soluble carbonate into the mixed solution obtained in the step (1) to react to obtain the electromagnetic shielding material.
The preparation method of the electromagnetic shielding material provided by the invention is simple, convenient and feasible, and can be used for large-scale batch production.
Preferably, the polyacrylic acid is used in an amount of 0.01 to 1mol, for example, 0.03mol, 0.05mol, 0.09mol, 0.1mol, 0.2mol, 0.3mol, 0.4mol, 0.5mol, 0.6mol, 0.7mol, 0.8mol, 0.9mol, etc., more preferably 0.05 to 0.5mol, based on 1L of the mixed solution in the step (1).
Preferably, the number of moles of the water-soluble carbonate is 0.1 to 1mol, for example 0.2mol, 0.3mol, 0.4mol, 0.5mol, 0.6mol, 0.7mol, 0.8mol or 0.9mol, etc., more preferably 0.2 to 0.5mol, based on 1L of the aqueous solution of the water-soluble carbonate in step (2).
Preferably, the method of adding in step (2) is dropwise addition.
Preferably, the reaction of step (2) is followed by a washing step.
Preferably, the washing comprises deionized water washing.
In a third aspect, the present invention provides an electromagnetic shielding material according to the first aspect for use in an electronic device.
Compared with the prior art, the invention has the following beneficial effects:
(1) The preparation raw materials of the electromagnetic shielding material with the self-repairing function comprise polyacrylic acid, calcium chloride, water-soluble polymers, carbon materials and water-soluble carbonates, wherein the calcium chloride can form amorphous calcium carbonate with the water-soluble carbonates, the electromagnetic shielding material takes the polyacrylic acid, the amorphous calcium carbonate and the water-soluble polymers as matrixes to obtain hydrogel, the carbon materials are dispersed in the hydrogel, and the obtained electromagnetic shielding material has excellent electromagnetic shielding performance while the capability of arbitrary stretching, deformation, remodelling and recycling is ensured;
(2) The preparation method of the electromagnetic shielding material with the self-repairing function provided by the invention has the advantages of high production efficiency, simplicity, feasibility and large-scale amplification application, and the used raw materials are nontoxic and harmless, do not use toxic and harmful chemical reagents, do not generate waste water, and meet the requirements of environmental protection.
Drawings
Fig. 1 is a view showing the appearance of the electromagnetic shielding material with a self-repairing function obtained in example 1 in a normal state;
fig. 2 is a view showing the external appearance of the electromagnetic shielding material with a self-repairing function obtained in example 1 before being manually stretched;
fig. 3 is a view showing the external appearance of the electromagnetic shielding material with a self-repairing function obtained in example 1 after being manually stretched;
fig. 4 is a shape diagram of the electromagnetic shielding material with self-repairing function obtained in example 1 after separation;
fig. 5 is a drawing showing the stretched shape of the electromagnetic shielding material with self-repairing function obtained in example 1 after separation and after contact recovery for 1 s.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Example 1
An electromagnetic shielding material with a self-repairing function, and the preparation method of the electromagnetic shielding material comprises the following steps:
(1) Dispersing polyacrylic acid with the molecular weight of 3000g/mol, calcium chloride, chitosan and graphene powder in water, and uniformly stirring to obtain a mixed solution, wherein the concentration of the polyacrylic acid is 0.2mol/L, the concentration of the calcium chloride is 0.2mol/L, the mass ratio of the chitosan to the polyacrylic acid is 2:100, the mass ratio of the graphene powder to the polyacrylic acid is 5:100, and the molar ratio of the calcium chloride to the polyacrylic acid is 1:1;
(2) And (3) dropwise adding an aqueous solution of sodium carbonate with the concentration of 0.5mol/L into the mixed solution obtained in the step (1), and reacting under vigorous stirring to obtain the electromagnetic shielding material.
Example 2
An electromagnetic shielding material with a self-repairing function is different from example 1 only in that the graphene powder in step (1) of example 1 is replaced with a carbon nanotube powder, and other components, amounts and steps are the same as those of example 1.
Example 3
An electromagnetic shielding material having a self-repairing function is different from example 1 only in that the graphene powder in step (1) of example 1 is replaced with carbon black powder, and other components, amounts and steps are the same as those of example 1.
Example 4
The electromagnetic shielding material with the self-repairing function is different from the electromagnetic shielding material in the embodiment 1 only in that the mass ratio of graphene powder to polyacrylic acid in the step (1) is 1:100, and other components, amounts and steps are the same as those in the embodiment 1.
Example 5
The electromagnetic shielding material with the self-repairing function is different from the electromagnetic shielding material in the embodiment 1 only in that the mass ratio of graphene powder to polyacrylic acid in the step (1) is 7:100, and other components, amounts and steps are the same as those in the embodiment 1.
Example 6
An electromagnetic shielding material with a self-repairing function is different from example 1 only in that polyvinyl alcohol is used instead of chitosan in step (1) of example 1, and other components, amounts and steps are the same as those of example 1.
Example 7
The electromagnetic shielding material with the self-repairing function is different from the electromagnetic shielding material in the embodiment 1 only in that the mass ratio of graphene powder to polyacrylic acid in the step (1) is 20:100, and other components, amounts and steps are the same as those in the embodiment 1.
Example 8
The electromagnetic shielding material with the self-repairing function is different from the electromagnetic shielding material in the embodiment 1 only in that the mass ratio of graphene powder to polyacrylic acid in the step (1) is 30:100, and other components, amounts and steps are the same as those in the embodiment 1.
Example 9
The electromagnetic shielding material with the self-repairing function is different from the electromagnetic shielding material in the embodiment 1 only in that the mass ratio of graphene powder to polyacrylic acid in the step (1) is 0.8:100, and other components, amounts and steps are the same as those in the embodiment 1.
Example 10
The electromagnetic shielding material with the self-repairing function is different from the electromagnetic shielding material in the embodiment 1 only in that the mass ratio of chitosan to polyacrylic acid in the step (1) is 10:100, and other components, amounts and steps are the same as those in the embodiment 1.
Example 11
The electromagnetic shielding material with the self-repairing function is different from the electromagnetic shielding material in the embodiment 1 only in that the mass ratio of chitosan to polyacrylic acid in the step (1) is 0.1:100, and other components, amounts and steps are the same as those in the embodiment 1.
Example 12
The electromagnetic shielding material with the self-repairing function is different from the electromagnetic shielding material in the embodiment 1 only in that the mass ratio of chitosan to polyacrylic acid in the step (1) is 25:100, and other components, amounts and steps are the same as those in the embodiment 1.
Example 13
The electromagnetic shielding material with the self-repairing function is different from the electromagnetic shielding material in the embodiment 1 only in that the mass ratio of chitosan to polyacrylic acid in the step (1) is 0.05:100, and other components, amounts and steps are the same as those in the embodiment 1.
Example 14
An electromagnetic shielding material having a self-repairing function is different from example 1 only in that the molecular weight of polyacrylic acid in step (1) is 500g/mol, and other components, amounts and steps are the same as those of example 1.
Example 15
An electromagnetic shielding material having a self-repairing function was different from example 1 only in that the molecular weight of polyacrylic acid in step (1) was 100500g/mol, and other components, amounts and steps were the same as those in example 1.
Comparative example 1
An electromagnetic shielding material having a self-repairing function differs from example 1 only in that no carbon material is added in step (1), and other components, amounts and steps are the same as those of example 1.
Performance test:
(1) Appearance: and visually observing the shape of the prepared material stretched after the material is in a normal state, before and after manual stretching, after being divided into two halves and then contacted for recovering 1 s.
The electromagnetic shielding material with the self-repairing function obtained in the embodiment 1 is tested according to the test method (1), an outline view of the electromagnetic shielding material with the self-repairing function obtained in the embodiment 1 in a normal state is shown in fig. 1, and as can be seen from fig. 1, the electromagnetic shielding material obtained in the embodiment 1 can keep a fixed shape without support; the shape diagrams of the electromagnetic shielding material with the self-repairing function obtained in the embodiment 1 before and after being manually stretched are shown in fig. 2 and 3 respectively, and as can be seen from fig. 2 and 3, the electromagnetic shielding material obtained in the embodiment 1 can be arbitrarily stretched and deformed without breaking; the tensile shape diagrams of the electromagnetic shielding material with the self-repairing function obtained in the embodiment 1 after being divided into two halves and being contacted again for 1s are shown in fig. 4 and 5, respectively, and it can be seen from fig. 4 and 5 that the electromagnetic shielding material obtained in the embodiment 1 can be quickly self-repaired.
(2) Electromagnetic shielding performance: measuring an electromagnetic shielding material with the thickness of 9mm on a vector network analyzer by adopting a waveguide method, wherein the frequency range of electromagnetic waves is 8.2-12.4 GHz (X-wave band);
the electromagnetic shielding materials obtained in examples 1 to 15 and comparative example 1 were tested according to the above test methods, and the test results are shown in table 1:
TABLE 1
From the data in table 1, it can be seen that:
the electromagnetic shielding materials obtained in examples 1 to 7 can maintain a fixed shape in a normal state, cannot break after being stretched, and can recover after being split into two halves and then contacted for 1 s; the electromagnetic shielding performance can reach 70-140 dB.
As can be seen from comparative example 1 and comparative example 1, the electromagnetic shielding performance of the material prepared without adding the carbon material was only 20dB.
Further comparing examples 1 and examples 7 to 9, it was found that the electromagnetic shielding material obtained in example 8 was pulverized, broken after stretching, and not easily recovered after breaking, which proves that an excessive amount of carbon material added resulted in a decrease in the self-repairing property of the material, and that the electromagnetic shielding property of the material obtained in example 9 was 50dB, which means that a lower amount of carbon material resulted in a decrease in the electromagnetic shielding property of the finally obtained material.
Further comparing example 1 with examples 10-13, it was found that too much chitosan addition (example 12) also resulted in a decrease in the self-healing properties of the material; too little chitosan addition (example 13) may result in the shape of the material not being fixed and the electromagnetic shielding performance of the material being degraded.
Further comparing example 1 with examples 14 to 15, it was found that too high or too low a molecular weight of polyacrylic acid affects the self-healing properties and electromagnetic shielding properties of the final material.
The applicant states that the present invention has been described by way of the above examples as an electromagnetic shielding material with a self-healing function, and a method for preparing and using the same, but the present invention is not limited to the above process steps, i.e. it is not meant that the present invention must be carried out in dependence on the above process steps. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of selected raw materials, addition of auxiliary components, selection of specific modes, etc. fall within the scope of the present invention and the scope of disclosure.
Claims (20)
1. The electromagnetic shielding material with the self-repairing function is characterized in that the preparation raw materials of the electromagnetic shielding material comprise polyacrylic acid, calcium chloride, water-soluble polymers, carbon materials and water-soluble carbonate;
the molecular weight of the polyacrylic acid is 1000-100000 g/mol;
the mass ratio of the water-soluble polymer to the polyacrylic acid is (0.1-10) 100;
the mass ratio of the carbon material to the polyacrylic acid is (1-20) 100;
the water-soluble polymer is selected from any one or a combination of at least two of polyvinyl alcohol, polyacrylamide, chitosan, carboxymethyl cellulose salt, carboxymethyl cellulose, alginate, methyl cellulose, gelatin, dextran or agarose.
2. The electromagnetic shielding material according to claim 1, wherein the molecular weight of the polyacrylic acid is 2000-5000 g/mol.
3. The electromagnetic shielding material according to claim 1, wherein the mass ratio of the water-soluble polymer to the polyacrylic acid is (0.5-5) 100.
4. The electromagnetic shielding material according to claim 1, wherein the molar ratio of the calcium chloride to the polyacrylic acid is 1 (0.5-1.5).
5. The electromagnetic shielding material according to claim 1, wherein the carbon material comprises any one or a combination of at least two of graphene, carbon nanotubes, carbon black, or activated carbon.
6. The electromagnetic shielding material according to claim 5, wherein the carbon material is graphene.
7. The electromagnetic shielding material according to claim 1, wherein the mass ratio of the carbon material to the polyacrylic acid is (1-10): 100.
8. The electromagnetic shielding material according to claim 1, wherein the water-soluble carbonate comprises any one or a combination of at least two of sodium carbonate, potassium carbonate, or ammonium carbonate.
9. The electromagnetic shielding material according to claim 8, wherein the water-soluble carbonate is sodium carbonate.
10. A method for producing the electromagnetic shielding material according to any one of claims 1 to 9, comprising the steps of:
(1) Dispersing polyacrylic acid, calcium chloride, water-soluble polymer and carbon material in water to obtain a mixed solution;
(2) And (3) adding the water solution of the water-soluble carbonate into the mixed solution obtained in the step (1) to react to obtain the electromagnetic shielding material.
11. The method according to claim 10, wherein the polyacrylic acid is used in an amount of 0.01 to 1mol based on 1L of the mixed solution in the step (1).
12. The method according to claim 11, wherein the polyacrylic acid is used in an amount of 0.05 to 0.5mol based on 1L of the mixed solution in the step (1).
13. The method according to claim 10, wherein the amount of the calcium chloride used is 0.01 to 1mol based on 1L of the mixed solution obtained in the step (1).
14. The method according to claim 13, wherein the amount of the calcium chloride used is 0.05 to 0.5mol based on 1L of the mixed solution obtained in the step (1).
15. The production method according to claim 10, wherein the number of moles of the water-soluble carbonate is 0.1 to 1mol based on 1L of the aqueous solution of the water-soluble carbonate in the step (2).
16. The production method according to claim 15, wherein the number of moles of the water-soluble carbonate is 0.2 to 0.5mol based on 1L of the aqueous solution of the water-soluble carbonate in step (2).
17. The method of claim 10, wherein the method of addition in step (2) is dropwise addition.
18. The method according to claim 10, wherein the reaction in step (2) is completed and further comprising a step of washing.
19. The method of claim 18, wherein the washing comprises deionized water washing.
20. Use of the electromagnetic shielding material according to any one of claims 1 to 9 in electronic equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111055299.7A CN113773597B (en) | 2021-09-09 | 2021-09-09 | Electromagnetic shielding material with self-repairing function and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111055299.7A CN113773597B (en) | 2021-09-09 | 2021-09-09 | Electromagnetic shielding material with self-repairing function and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113773597A CN113773597A (en) | 2021-12-10 |
| CN113773597B true CN113773597B (en) | 2023-05-09 |
Family
ID=78841978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111055299.7A Active CN113773597B (en) | 2021-09-09 | 2021-09-09 | Electromagnetic shielding material with self-repairing function and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113773597B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7786736B2 (en) * | 2003-08-06 | 2010-08-31 | University Of Delaware | Method and system for detecting damage in aligned carbon nanotube fiber composites using networks |
| JP6945840B2 (en) * | 2017-06-09 | 2021-10-06 | 国立研究開発法人産業技術総合研究所 | Electromagnetic wave shielding carbon nanotube coating liquid and electromagnetic wave shielding material |
| CN110028742B (en) * | 2018-11-15 | 2021-03-05 | 深圳和畅电磁材料有限公司 | Preparation method of electromagnetic shielding material based on boron nitride nanosheet/carbon fiber composite modification |
| CN109974905A (en) * | 2019-04-03 | 2019-07-05 | 南开大学 | A kind of strain gauge and preparation method thereof with self-reparing capability |
| CN112358824A (en) * | 2020-11-09 | 2021-02-12 | 羚鲨贸易(东莞)有限公司 | Electromagnetic shielding adhesive tape and preparation method of double-sided conductive adhesive tape layer based on modification of hexagonal boron nitride nanosheets |
-
2021
- 2021-09-09 CN CN202111055299.7A patent/CN113773597B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113773597A (en) | 2021-12-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111809439B (en) | Flexible high-strength MXene-based electromagnetic shielding composite film and preparation method thereof | |
| Fu et al. | A self-healing, recyclable and conductive gelatin/nanofibrillated cellulose/Fe 3+ hydrogel based on multi-dynamic interactions for a multifunctional strain sensor | |
| Wang et al. | Mechanically robust, degradable and conductive MXene-composited gelatin organohydrogel with environmental stability and self-adhesiveness for multifunctional sensor | |
| CN102199871B (en) | Composite conductive fiber with coaxial three-element, and preparation method thereof. | |
| CN112374490B (en) | Three-dimensional porous graphene/polyurethane flexible stress-strain sensor and preparation method thereof | |
| Lai et al. | Arbitrarily reshaping and instantaneously self-healing graphene composite hydrogel with molecule polarization-enhanced ultrahigh electromagnetic interference shielding performance | |
| CN108559112A (en) | A kind of preparation method of graphene-cellulose conductive composite film | |
| CN114133616B (en) | Recyclable cellulose-based conductive self-repairing eutectic gel and preparation method and application thereof | |
| CN111394833A (en) | Carbon nanotube/graphene composite fiber and preparation method thereof | |
| Qin et al. | A Simple and Effective Physical Ball‐Milling Strategy to Prepare Super‐Tough and Stretchable PVA@ MXene@ PPy Hydrogel for Flexible Capacitive Electronics | |
| CN105236391A (en) | Method of preparing graphene with lignin solution | |
| CN113773597B (en) | Electromagnetic shielding material with self-repairing function and preparation method and application thereof | |
| CN114702709A (en) | Flexible MXene protein composite membrane with electromagnetic shielding and pressure-sensitive characteristics, preparation method and application thereof | |
| CN105085907A (en) | Method for preparing polyaniline grafted carbon material | |
| CN113185715B (en) | Self-healing conductive polyvinyl alcohol-based hydrogel and preparation method and application thereof | |
| Yang et al. | Using deep eutectic solvents to pretreat corncob for the fabrication of sustainable lignocellulose hydrogels | |
| CN110164706A (en) | A kind of preparation method of bacteria cellulose-compound microfibre of carbon nano-tube/poly aniline and micro super capacitor | |
| CN111978611B (en) | High-strength conductive self-healing rubber composite material and preparation method thereof | |
| CN112591749A (en) | Nitrogen-doped carbon foam prepared by carbonizing polyester and preparation method thereof | |
| CN108411395A (en) | Conductive cellulose fiber and preparation method thereof | |
| KR101963038B1 (en) | Fabrication of conductive paste based on polypyrrole nanoparticles for smart diaper electrode | |
| CN111910420A (en) | Method for preparing thin high-strength composite heat-conducting functional film with sandwich structure | |
| CN109952013B (en) | Spiral electromagnetic shielding material and preparation method thereof | |
| CN114685845B (en) | Conductive auxetic open-cell foam composite material and preparation method and application thereof | |
| CN103275343B (en) | Method for preparing polyaniline surface modified conductive polyester chips |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |