CN112848586B - Multilayer electromagnetic shielding composite material based on isolation structure and preparation method and application thereof - Google Patents

Multilayer electromagnetic shielding composite material based on isolation structure and preparation method and application thereof Download PDF

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CN112848586B
CN112848586B CN202011604311.0A CN202011604311A CN112848586B CN 112848586 B CN112848586 B CN 112848586B CN 202011604311 A CN202011604311 A CN 202011604311A CN 112848586 B CN112848586 B CN 112848586B
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filler
composite material
layer
electromagnetic shielding
resin
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CN112848586A (en
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冉祥海
王春博
付超
聂伟
钱景
高一星
楚慧颖
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Changchun Institute of Applied Chemistry of CAS
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Abstract

The invention provides an electromagnetic shielding composite material, which comprises an absorption layer and a reflection layer compounded on the absorption layer; the absorbent layer includes a modified resin layer; the modified resin layer has an isolation structure; the reflective layer includes a metal nanowire film layer. The electromagnetic shielding composite material with the specific structure and the composition is obtained by adopting the specific layer material and combining the laminated structure of the absorption layer and the reflection layer, wherein the absorption layer is of a special isolation structure. The composite material has the advantages of high electromagnetic shielding efficiency, low electromagnetic wave reflection, excellent mechanical property and the like, and the absorption layer is a special isolation structure which can promote the fillers in the absorption layer to be mutually overlapped to form a filler network, so that the shielding efficiency of the absorption layer is improved to the greatest extent, and the reflection of the composite material to the electromagnetic wave is further reduced. The electromagnetic shielding composite material can replace the traditional electromagnetic shielding composite material and is applied to the emerging 5G communication field and the aerospace field.

Description

Multilayer electromagnetic shielding composite material based on isolation structure and preparation method and application thereof
Technical Field
The invention belongs to the technical field of electromagnetic shielding materials, relates to an electromagnetic shielding composite material, and a preparation method and application thereof, and particularly relates to a multilayer electromagnetic shielding composite material based on an isolation structure, and a preparation method and application thereof.
Background
The development of electronic information technology brings great convenience to people and simultaneously generates a great deal of electromagnetic pollution. A large amount of electromagnetic pollution influences the normal operation of instruments and equipment, and especially the requirements on the anti-interference capability of signals in the emerging 5G communication field and the aerospace field are more strict. Accordingly, various electromagnetic shielding composite materials have been developed.
The traditional electromagnetic shielding composite material mostly adopts a blending process to mix polymer resin and filler, and the shielding effectiveness depends on the continuity degree of a conductive network. Because the filler is easy to agglomerate in the matrix, a large amount of conductive filler (such as metal powder, carbon nano tubes, carbon fibers, graphene and the like) is usually required to be added to obtain good conductive performance. Meanwhile, the impedance mismatch between the composite material and air can be caused by the addition of a large amount of filler in the resin matrix, so that a large amount of electromagnetic reflection is caused, and secondary electromagnetic wave pollution is caused. Meanwhile, the mechanical property of the composite material is greatly reduced due to the addition of a large amount of filler in the resin matrix, and the actual application cannot be met.
Therefore, how to find a suitable electromagnetic shielding composite material to solve the above problems of the existing electromagnetic shielding composite materials has become one of the problems to be solved by the prospective researchers in the field.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide an electromagnetic shielding composite material, a method for preparing the same, and an application of the same, and in particular, to an electromagnetic shielding composite material with a multi-layer structure based on an isolation structure.
The invention provides an electromagnetic shielding composite material, which comprises an absorption layer and a reflection layer compounded on the absorption layer;
the absorbent layer includes a modified resin layer;
the modified resin layer has an isolation structure;
the reflective layer includes a metal nanowire film layer.
Preferably, the thickness of the absorption layer is 50-200 μm;
the thickness of the reflecting layer is 1-5 mu m;
the metal comprises one or more of gold, silver and copper;
the electromagnetic shielding composite material has a multilayer structure with 4 layers or more;
the electromagnetic shielding composite material is provided with an absorption layer and a reflection layer which are alternately laminated;
the number of the absorption layer/reflection layer layers alternately stacked is not less than 2.
Preferably, the diameter of the metal nanowire is 50-200 nm;
the length of the metal nanowire is 10-50 mu m;
in the metal nanowire film layer, the metal nanowires have a shape structure which is stacked in a staggered mode;
the resin matrix of the modified resin comprises one or more of polyethylene resin, polypropylene resin, polyvinyl chloride resin, polyvinylidene fluoride resin, polyurethane resin and polyphenyl ether resin;
the modified resin comprises a resin and a modified filler;
the isolation structure is formed by compounding the modified filler on the surface of the resin.
Preferably, the mass ratio of the resin to the modified filler is (70-95): (5-30);
the modified filler is prepared from a filler A and a filler B;
the filler A comprises one or more of nickel powder, titanium carbide, expanded graphite, flake graphite and graphene nanosheets;
the filler B comprises graphene oxide and/or acidified carbon nanotubes;
the mass ratio of the filler A to the filler B is 1: (0.5 to 1);
the isolation structure is specifically formed by gathering the modified filler on the surface of the resin to form a net-shaped or layered isolation structure.
The invention provides a preparation method of an electromagnetic shielding composite material, which comprises the following steps:
1) mixing the filler A with a solvent, adding the filler B, continuously mixing, adding ferric chloride, alkali and hydrazine hydrate, mixing again, and reacting to obtain a modified filler;
2) stirring and mixing the modified filler and the resin obtained in the step, and then carrying out hot pressing to obtain a modified resin layer with an isolation structure;
3) and compounding the metal nanowire dispersion liquid subjected to the plasma treatment on the modified resin layer with the isolation structure to obtain the electromagnetic shielding composite material.
Preferably, the filler A comprises one or more of nickel powder, titanium carbide, expanded graphite, flake graphite and graphene nanosheets;
the solvent comprises one or more of methanol, ethanol and glycol;
the mixing time is 1-3 h;
the filler B comprises graphene oxide and/or acidified carbon nanotubes;
the mass ratio of the filler A to the filler B is 1: (0.5 to 1);
the mass ratio of the filler A to the solvent is 1: (100-300).
Preferably, the means of mixing and continuing mixing comprises ultrasonic dispersion;
the continuous mixing time is 1-3 h;
the alkali comprises potassium hydroxide and/or sodium hydroxide;
the mass ratio of the ferric chloride to the filler B is (10-30): 1;
the mass ratio of the alkali to the ferric chloride is (3-5): 1;
the mass ratio of the hydrazine hydrate to the ferric chloride is 1: (8-10);
the remixing time is 2-4 h.
Preferably, the reaction temperature is 160-200 ℃;
the reaction time is 8-16 h;
the stirring and mixing time is 5-30 min;
the rotating speed of stirring and mixing is 30-120 rpm;
the hot pressing temperature is 140-270 ℃;
the pressure of hot pressing is 0.5-1 MPa.
Preferably, the concentration of the metal nanowire dispersion liquid is 2-10 mg/ml;
the solvent of the metal nanowire dispersion liquid comprises ethanol, methanol, a polyvinyl alcohol aqueous solution with the mass fraction of 5%, a polyvinyl alcohol aqueous solution with the mass fraction of 7% or a polyvinyl alcohol aqueous solution with the mass fraction of 10%;
the plasma treatment time is 30-60 s;
the compound mode comprises spraying;
and a drying step is also included after the compounding.
The invention also provides an application of the electromagnetic shielding composite material in any one of the technical schemes or the electromagnetic shielding composite material prepared by the preparation method in any one of the technical schemes in the 5G communication field or the aerospace field.
The invention provides an electromagnetic shielding composite material, which comprises an absorption layer and a reflection layer compounded on the absorption layer; the absorbent layer includes a modified resin layer; the modified resin layer has an isolation structure; the reflective layer includes a metal nanowire film layer. Compared with the prior art, the electromagnetic shielding composite material with the specific structure and composition is obtained by adopting the specific layer material and combining the laminated structure of the absorption layer and the reflection layer, wherein the absorption layer is of a special isolation structure. The electromagnetic shielding composite material provided by the invention can realize high electromagnetic shielding efficiency and low electromagnetic reflection, has excellent mechanical properties, and effectively solves the problem that the existing conductive composite material prepared by a direct blending method can achieve ideal shielding performance only by adding a large amount of fillers into a resin matrix, and the mechanical properties of the whole composite material are reduced by adding a large amount of fillers, so that the actual requirements are difficult to meet; a large amount of electromagnetic wave reflection easily causes secondary pollution and the like.
The electromagnetic shielding composite material with the multilayer structure, which is prepared by utilizing the alternate laminated structure of the absorption layer and the reflection layer, has the advantages of high electromagnetic shielding efficiency, low electromagnetic wave reflection, excellent mechanical property and the like, and the absorption layer is a special isolation structure, so that fillers in the absorption layer can be promoted to be mutually overlapped to form a filler network, the shielding efficiency of the absorption layer is improved to the greatest extent, and the reflection of the composite material to electromagnetic waves is further reduced. The electromagnetic shielding composite material can replace the traditional electromagnetic shielding composite material and is applied to the emerging 5G communication field or the aerospace field.
Experimental results show that the highest shielding effectiveness of the multilayer electromagnetic shielding composite material prepared by the invention is 83.7dB at the frequency of 9.5GHz, the highest shielding effectiveness is obviously superior to 52.9dB of a sample prepared by a blending method at the same content, the highest absorption efficiency reaches 95%, and secondary pollution caused by reflection of a large amount of electromagnetic waves is greatly reduced. Meanwhile, the prepared sample has excellent mechanical properties, and meets the mechanical property requirements of the electromagnetic shielding material in the application of the emerging 5G communication field and the aerospace field.
Drawings
FIG. 1 is a schematic diagram of a process for preparing a multilayer electromagnetic shielding composite material based on an isolation structure according to the present invention;
FIG. 2 shows the shielding effectiveness of the multilayer electromagnetic shielding composite material based on the isolation structure under the condition of 1-12 GHz.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
All of the starting materials of the present invention, without particular limitation as to their source, may be purchased commercially or prepared according to conventional methods well known to those skilled in the art.
All the raw materials of the present invention are not particularly limited in purity, and the present invention preferably adopts a purity that is conventional in the field of analytical purification or electromagnetic shielding composite materials.
All the raw materials, the marks and the acronyms thereof belong to the conventional marks and acronyms in the field, each mark and acronym is clear and definite in the field of related application, and the raw materials can be purchased from the market or prepared by a conventional method by the technical staff in the field according to the marks, the acronyms and the corresponding application.
The invention provides an electromagnetic shielding composite material, which comprises an absorption layer and a reflection layer compounded on the absorption layer;
the absorbent layer includes a modified resin layer;
the modified resin layer has an isolation structure;
the reflective layer includes a metal nanowire film layer.
In the present invention, the thickness of the reflective layer is preferably 1 to 5 μm, more preferably 1.5 to 4.5 μm, more preferably 2 to 4 μm, and more preferably 2.5 to 3.5 μm.
In the present invention, the metal preferably includes one or more of gold, silver and copper, and more preferably gold, silver or copper.
In the invention, the diameter of the metal nanowire is preferably 50-200 nm, more preferably 80-170 nm, and more preferably 110-140 nm.
In the invention, the length of the metal nanowire is preferably 10-50 μm, more preferably 15-45 μm, more preferably 20-40 μm, and more preferably 25-35 μm.
In the present invention, in the metal nanowire film layer, the metal nanowires preferably have a staggered stacked morphology structure.
In the present invention, the thickness of the absorption layer is preferably 50 to 200 μm, more preferably 80 to 150 μm, and still more preferably 110 to 130 μm.
In the present invention, the resin matrix of the modified resin preferably includes one or more of a polyethylene resin, a polypropylene resin, a polyvinyl chloride resin, a polyvinylidene fluoride resin, a polyurethane resin, and a polyphenylene ether resin, and more preferably a polyethylene resin, a polypropylene resin, a polyvinyl chloride resin, a polyvinylidene fluoride resin, a polyurethane resin, or a polyphenylene ether resin.
In the present invention, the modified resin preferably includes a resin and a modified filler.
In the invention, the mass ratio of the resin to the modified filler is preferably (70-95): (5-30), more preferably (75-90): (5-30), more preferably (80-85): (5-30), more preferably (70-95): (10-25), more preferably (70-95): (15-20). In the present invention, the mass ratio is preferably in terms of the mass ratio of the raw materials, that is, the modified resin in the present invention is preferably obtained by preparing the resin and the modified filler.
In the present invention, the modified filler is preferably prepared from filler a and filler B.
In the present invention, the filler a preferably includes one or more of nickel powder, titanium carbide, expanded graphite, flake graphite, and graphene nanoplatelets, and more preferably includes nickel powder, titanium carbide, expanded graphite, flake graphite, or graphene nanoplatelets.
In the present invention, the filler B preferably includes graphene oxide and/or acidified carbon nanotubes, and more preferably graphene oxide or acidified carbon nanotubes.
In the present invention, the mass ratio of the filler a to the filler B is preferably 1: (0.5 to 1), more preferably 1: (0.6 to 0.9), more preferably 1: (0.7-0.8).
In the present invention, the electromagnetic shielding composite material preferably has a multilayer structure of 4 or more layers, more preferably 8 or more layers, and still more preferably 10 or more layers.
In the present invention, the electromagnetic shielding composite preferably has an absorption layer and a reflection layer which are alternately laminated.
In the present invention, the number of alternately stacked absorption layers/reflection layers is preferably 2 or more, more preferably 3 or more, and still more preferably 5 or more.
In the present invention, the number of alternately stacked absorption layers/reflection layers is preferably 2 or more, that is, 2 or more layers. In the present invention, the absorption layer and the reflection layer are 1 stack of alternating layers, and the number of the stack of alternating layers is preferably 2 or more.
The invention provides a preparation method of an electromagnetic shielding composite material, which comprises the following steps:
1) mixing the filler A with a solvent, adding the filler B, continuously mixing, adding ferric chloride, alkali and hydrazine hydrate, mixing again, and reacting to obtain a modified filler;
2) stirring and mixing the modified filler and the resin obtained in the step, and then carrying out hot pressing to obtain a modified resin layer with an isolation structure;
3) and compounding the metal nanowire dispersion liquid subjected to the plasma treatment on the modified resin layer with the isolation structure to obtain the electromagnetic shielding composite material.
The selection and composition of the raw materials required in the preparation process and the corresponding preferred principle can be corresponding to the selection and composition of the raw materials corresponding to the electromagnetic shielding composite material and the corresponding preferred principle, and are not described in detail herein.
Firstly, mixing a filler A with a solvent, then adding a filler B, continuously mixing, then adding ferric chloride, alkali and hydrazine hydrate, mixing again, and reacting to obtain the modified filler.
In the present invention, the filler a preferably includes one or more of nickel powder, titanium carbide, expanded graphite, flake graphite, and graphene nanoplatelets, and more preferably includes nickel powder, titanium carbide, expanded graphite, flake graphite, or graphene nanoplatelets.
In the present invention, the solvent preferably includes one or more of methanol, ethanol and ethylene glycol, more preferably methanol, ethanol or ethylene glycol.
In the invention, the mixing time is preferably 1-3 h, more preferably 1.4-2.6 h, and more preferably 1.8-2.2 h.
In the present invention, the filler B preferably includes graphene oxide and/or acidified carbon nanotubes, and more preferably graphene oxide or acidified carbon nanotubes.
In the present invention, the mass ratio of the filler a to the filler B is preferably 1: (0.5 to 1), more preferably 1: (0.6 to 0.9), more preferably 1: (0.7-0.8).
In the present invention, the mass ratio of the filler a to the solvent is preferably 1: (100-300), more preferably 1: (140-260), more preferably 1: (180-220).
In the present invention, the mixing and the manner of continuing the mixing each preferably include ultrasonic dispersion.
In the invention, the time for continuously mixing is preferably 1-3 h, more preferably 1.4-2.6 h, and more preferably 1.8-2.2 h.
In the present invention, the base preferably comprises potassium hydroxide and/or sodium hydroxide, more preferably potassium hydroxide or sodium hydroxide.
In the present invention, the mass ratio of the ferric chloride to the filler B is preferably (10 to 30): 1, more preferably (14 to 26): 1, more preferably (18 to 22): 1.
in the invention, the mass ratio of the alkali to the ferric chloride is preferably (3-5): 1, more preferably
(3.4-4.6): 1, more preferably (3.8 to 4.2): 1.
in the present invention, the mass ratio of hydrazine hydrate to ferric chloride is preferably 1: (8-10), more preferably 1: (8.4 to 9.6), more preferably 1: (8.8-9.2).
In the invention, the time for remixing is preferably 2-4 h, more preferably 2.4-3.6 h, and more preferably 2.8-3.2 h.
In the invention, the reaction temperature is preferably 160-200 ℃, more preferably 165-195 ℃, more preferably 170-190 ℃, and more preferably 175-185 ℃.
In the invention, the reaction time is preferably 8-16 h, more preferably 9-15 h, more preferably 10-14 h, and more preferably 11-13 h.
The modified filler and the resin obtained in the above steps are stirred and mixed, and then hot-pressed to obtain a modified resin layer with an isolation structure;
in the invention, the stirring and mixing time is preferably 5-30 min, more preferably 10-25 min, and more preferably 15-20 min.
In the present invention, the rotation speed of the stirring and mixing is preferably 30 to 120rpm, more preferably 50 to 100rpm, and still more preferably 70 to 80 rpm.
In the invention, the hot pressing temperature is preferably 140-270 ℃, more preferably 160-250 ℃, more preferably 180-230 ℃, and more preferably 200-210 ℃.
In the invention, the pressure of the hot pressing is preferably 0.5-1 MPa, more preferably 0.6-0.9 MPa, and more preferably 0.7-0.8 MPa.
Finally, the metal nanowire dispersion liquid after plasma treatment is compounded on the modified resin layer with the isolation structure, so that the electromagnetic shielding composite material is obtained.
In the invention, the concentration of the metal nanowire dispersion liquid is preferably 2-10 mg/ml, more preferably 3-9 mg/ml, more preferably 4-8 mg/ml, and more preferably 5-7 mg/ml.
In the present invention, the solvent of the metal nanowire dispersion preferably includes ethanol, methanol, a 5% by mass aqueous solution of polyvinyl alcohol, a 7% by mass aqueous solution of polyvinyl alcohol, or a 10% by mass aqueous solution of polyvinyl alcohol.
In the present invention, the plasma treatment time is preferably 30 to 60 seconds, more preferably 35 to 55 seconds, and still more preferably 40 to 50 seconds.
In the present invention, the compounding means preferably includes spraying.
In the present invention, the compounding preferably includes a drying step.
In the present invention, when the number of alternately stacked layers is preferably 2 or more, step 4) is further included,
4) and (3) laminating the electromagnetic shielding composite materials obtained in the above steps, and carrying out hot pressing again to obtain the multilayer electromagnetic shielding composite material.
The parameters of said re-hot pressing are not particularly restricted by the present invention, as is conventional for such operations, well known to those skilled in the art.
The invention is a complete and detailed integral technical scheme, and the preparation method of the electromagnetic shielding composite material specifically comprises the following steps:
1) preparing modified filler:
firstly, adding a certain mass of filler A into a solvent for ultrasonic dispersion for 1-3 hours, adding a filler B, continuing ultrasonic dispersion for 1-3 hours, respectively adding ferric chloride, alkali and hydrazine hydrate into the dispersion liquid, stirring for 2-4 hours, transferring the mixed liquid into an autoclave, and treating for 8-16 hours at 160-200 ℃. And finally, cooling to room temperature, filtering, washing, and drying at 80-120 ℃ to obtain the final modified filler.
2) Preparation of an absorption layer:
weighing a certain mass of resin, and stirring and mixing the resin and the modified filler in a stirrer. Then hot pressing is carried out at certain temperature and pressure to obtain a film with certain thickness, namely an absorption layer.
3) Preparation of an absorption/reflection layer:
dispersing metal nanowires in a solvent at a concentration of 2-10 mg/ml, treating the obtained film with plasma for 30-60 s, then spraying the metal nanowire dispersion liquid on the surface of the film, and drying to obtain an absorption/reflection layer
4) Preparing a multilayer electromagnetic shielding composite material based on an isolation structure:
and laminating the absorption/reflection layers, and then carrying out hot pressing at certain temperature and pressure to obtain the multilayer electromagnetic shielding composite material based on the isolation structure.
Referring to fig. 1, fig. 1 is a schematic diagram of a technical route for preparing a multilayer electromagnetic shielding composite material based on an isolation structure according to the present invention.
The invention also provides an application of the electromagnetic shielding composite material in any one of the technical schemes or the electromagnetic shielding composite material prepared by the preparation method in any one of the technical schemes in the 5G communication field or the aerospace field.
The invention provides a multilayer electromagnetic shielding composite material based on an isolation structure, and a preparation method and application thereof. The electromagnetic shielding composite material with the specific structure and the specific composition is obtained by adopting the specific layer material and combining the alternate laminated structure of the absorption layer and the reflection layer, wherein the absorption layer is of a special isolation structure. The composite material with the structure realizes high electromagnetic shielding efficiency, low electromagnetic reflection and excellent mechanical property. The alternate laminated structure design of the absorption layer and the reflection layer of the composite material provided by the invention endows the material with low electromagnetic wave reflection, and avoids harm caused by secondary pollution of electromagnetic waves; meanwhile, the composite material prepared by the invention has excellent mechanical properties, and can meet the requirements on the mechanical properties of the composite material in the practical application process while meeting the electromagnetic shielding performance. The invention effectively solves the problems that the prior conductive composite material prepared by a direct blending method can achieve ideal shielding performance only by adding a large amount of filler into a resin matrix, the mechanical performance of the whole composite material is reduced by adding a large amount of filler, the actual requirement is difficult to meet, secondary pollution is easily caused by the reflection of a large amount of electromagnetic waves, and the like.
The multilayer electromagnetic shielding composite material prepared by utilizing the alternate laminated structure of the absorption layer and the reflection layer has the advantages of high electromagnetic shielding efficiency, low electromagnetic wave reflection, excellent mechanical property and the like, and the absorption layer is a special isolation structure which can promote fillers in the absorption layer to be mutually overlapped to form a filler network, so that the shielding efficiency of the absorption layer is improved to the greatest extent, and the reflection of the composite material to electromagnetic waves is further reduced. The electromagnetic shielding composite material can replace the traditional electromagnetic shielding composite material and is applied to the emerging 5G communication field and the aerospace field.
Experimental results show that the highest shielding effectiveness of the multilayer electromagnetic shielding composite material prepared by the invention is 83.7dB at the frequency of 9.5GHz, the highest shielding effectiveness is obviously superior to 52.9dB of a sample prepared by a blending method at the same content, the highest absorption efficiency reaches 95%, and secondary pollution caused by reflection of a large amount of electromagnetic waves is greatly reduced. Meanwhile, the prepared sample has excellent mechanical properties, and meets the mechanical property requirements of the electromagnetic shielding material in the application of the emerging 5G communication field and the aerospace field.
For further illustration of the present invention, the following will describe an electromagnetic shielding composite material and its preparation method and application in detail with reference to the following examples, but it should be understood that these examples are implemented on the premise of the technical solution of the present invention, and the detailed embodiments and specific operation procedures are given, only for further illustration of the features and advantages of the present invention, not for limitation of the claims of the present invention, and the scope of protection of the present invention is not limited to the following examples.
Example 1
1) Preparing modified filler:
firstly, 1g of graphene nanosheet is added into methanol for ultrasonic dispersion for 3 hours, then 1g of graphene oxide is added, ultrasonic treatment is continued for 3 hours, 30g of ferric chloride, 150g of sodium hydroxide and 3.75g of hydrazine hydrate are respectively added into the dispersion liquid for stirring for 4 hours, the mixed liquid is transferred into an autoclave, and treatment is carried out for 16 hours at 200 ℃. And finally, cooling to room temperature, filtering, washing, and drying at 120 ℃ to obtain the final modified filler.
2) Preparation of an absorption layer:
7g of polyethylene resin was weighed and mixed with 3g of a modified filler blender, and then hot-pressed at a temperature of 140 ℃ and a pressure of 1MPa to obtain a 200um film, i.e., an absorption layer.
3) Preparation of an absorption/reflection layer:
dispersing silver nanowire (length: 50 um; diameter: 50nm) in ethanol at concentration of 10mg/ml, treating the obtained film with plasma for 60s, spraying silver nanowire dispersion on the surface of the film, drying, and spraying to a thickness of 5um to obtain an absorption/reflection layer
4) Preparing a multilayer electromagnetic shielding composite material:
and 5 absorbing/reflecting layers are laminated and then hot-pressed at the temperature of 140 ℃ and the pressure of 1MPa to obtain the multilayer electromagnetic shielding composite material. The shielding effectiveness is 72.9-84.4dB under the condition of 1-12 GHz, and the absorption efficiency is 95% under the condition of 9.5 GHz.
The performance of the multilayer electromagnetic shielding composite material prepared in the embodiment 1 of the invention is detected.
Referring to table 1, table 1 shows the electromagnetic shielding effectiveness (9.5GHz) and mechanical properties of the multi-layered electromagnetic shielding composite material provided in example 1 of the present invention.
TABLE 1
Figure BDA0002871559780000111
Wherein SET: the total electromagnetic shielding effectiveness; SEA: absorption efficiency of electromagnetic waves; SER: reflection efficiency of electromagnetic waves; t iss: tensile strength; eb: elongation at break.
Table 1 shows the test results of the 5 absorption/reflection layers after lamination and hot pressing, the matrix resin is polyethylene, the addition amount of the modified filler is 30%, 10mg/ml metal nanowires are sprayed on the surface of the modified resin, and 5 layers of the modified resin are laminated and hot pressed.
As can be seen from table 1, the shielding effectiveness of the multilayer electromagnetic shielding composite material prepared in example 1 of the present invention is 83.7dB at a frequency of 9.5GHz, which is significantly better than the shielding effectiveness of 52.9dB of a sample prepared by a blending method at the same content, wherein the absorption shielding effectiveness is 79.5dB, the reflection shielding effectiveness is 4.2dB, and the absorption efficiency is as high as 95%. Meanwhile, the prepared sample has excellent mechanical properties, the tensile strength is 11.9MPa, and the elongation at break is 190%.
Referring to fig. 2, fig. 2 shows the shielding effectiveness of the multilayer electromagnetic shielding composite material based on the isolation structure under the condition of 1 to 12 GHz.
As can be seen from FIG. 2, the multilayer electromagnetic shielding composite material of the invention shows excellent electromagnetic shielding performance under the condition of 1-12 GHz with different addition amounts of the modified filler.
Example 2
1) Preparing modified filler:
firstly, 1g of flake graphite is added into ethanol for ultrasonic dispersion for 1 hour, 0.5g of acidified carbon nano tube is added, ultrasonic treatment is continued for 1 hour, 5g of ferric chloride, 15g of potassium hydroxide and 0.625g of hydrazine hydrate are respectively added into the dispersion liquid for stirring for 2 hours, the mixed liquid is transferred into an autoclave, and the treatment is carried out for 8 hours at 160 ℃. And finally, cooling to room temperature, filtering, washing, and drying at 80 ℃ to obtain the final modified filler.
2) Preparation of an absorption layer:
9g of polypropylene was weighed and mixed with 1g of modified filler in a blender, and then hot-pressed at a temperature of 170 ℃ and a pressure of 0.5MPa to obtain a film having a thickness of 50um, i.e., an absorption layer.
3) Preparation of an absorption/reflection layer:
dispersing gold nano-wire (length: 10 um; diameter: 200nm) in methanol solvent at concentration of 2mg/ml, treating the obtained film with plasma for 30s, then spraying gold nano-wire dispersion liquid on the surface of the film, drying, and spraying to thickness of 1um to obtain absorption/reflection layer
4) Preparing a multilayer electromagnetic shielding composite material:
2 layers of absorption/reflection layers are laminated and then hot-pressed at a temperature of 170 ℃ and a pressure of 0.5MPa to obtain the multilayer electromagnetic shielding composite material. The shielding effectiveness is 32.6-39.3dB under the condition of 1-12 GHz, and the absorption efficiency is 84% under the condition of 9.5 GHz.
Example 3
1) Preparing modified filler:
firstly, 1g of expanded graphite is added into ethylene glycol for ultrasonic dispersion for 2 hours, then 0.75g of graphene oxide is added, ultrasonic treatment is continued for 2 hours, 15g of ferric chloride, 60g of sodium hydroxide and 1.67g of hydrazine hydrate are respectively added into the dispersion liquid for stirring for 3 hours, the mixed liquid is transferred into an autoclave, and the treatment is carried out for 12 hours at 180 ℃. And finally, cooling to room temperature, filtering, washing and drying at 100 ℃ to obtain the final modified filler.
2) Preparation of an absorption layer:
8g of polyvinyl chloride resin was weighed and mixed with 2g of modified filler in a blender, and then hot-pressed at a temperature of 160 ℃ and a pressure of 0.75MPa to obtain a film having a thickness of 100um, i.e., an absorption layer.
3) Preparation of an absorption/reflection layer:
dispersing copper nanowires (length: 30 um; diameter: 150nm) in 5% polyvinyl alcohol aqueous solution at a concentration of 6mg/ml, treating the obtained film with plasma for 45s, spraying the copper nanowire dispersion on the surface of the film, drying, and spraying to a thickness of 3um to obtain an absorption/reflection layer
3) Preparing a multilayer electromagnetic shielding composite material:
and laminating 3 absorbing/reflecting layers, and then carrying out hot pressing at the temperature of 160 ℃ and the pressure of 0.75MPa to obtain the multilayer electromagnetic shielding composite material. The shielding effectiveness is 43.2-64.1dB under the condition of 1-12 GHz, and the absorption efficiency is 85% under the condition of 9.5 GHz.
Example 4
1) Preparing modified filler:
firstly, 1g of titanium carbide is added into methanol for ultrasonic dispersion for 3 hours, 1g of graphene oxide is added, ultrasonic treatment is continued for 3 hours, 30g of ferric chloride, 150g of sodium hydroxide and 3.75g of hydrazine hydrate are respectively added into the dispersion liquid for stirring for 4 hours, the mixed liquid is transferred into an autoclave, and the treatment is carried out for 16 hours at 200 ℃. And finally, cooling to room temperature, filtering, washing, and drying at 120 ℃ to obtain the final modified filler.
2) Preparation of an absorption layer:
weighing 7g of polyvinylidene fluoride resin, stirring and mixing the polyvinylidene fluoride resin with 3g of modified filler in a stirrer, and then carrying out hot pressing at the temperature of 180 ℃ and under the pressure of 1MPa to obtain a film of 200um, namely an absorption layer.
4) Preparation of an absorption/reflection layer:
dispersing silver nanowires (length: 10 um; diameter: 100nm) in 7% polyvinyl alcohol aqueous solution at a concentration of 10mg/ml, treating the obtained film with plasma for 60s, spraying silver nanowire dispersion on the surface of the film, drying, and spraying to a thickness of 5um to obtain an absorption/reflection layer
5) Preparing a multilayer electromagnetic shielding composite material:
and (3) laminating 5 absorbing/reflecting layers, and then carrying out hot pressing at the temperature of 180 ℃ and the pressure of 1MPa to obtain the multilayer electromagnetic shielding composite material. The shielding effectiveness is 68.6-79.8dB under the condition of 1-12 GHz, and the absorption efficiency is 91% under the condition of 9.5 GHz.
Example 5
1) Preparing modified filler:
firstly, 1g of nickel powder is added into methanol for ultrasonic dispersion for 3 hours, 1g of graphene oxide is added, ultrasonic treatment is continued for 3 hours, 30g of ferric chloride, 150g of sodium hydroxide and 3.75g of hydrazine hydrate are respectively added into the dispersion liquid for stirring for 4 hours, the mixed liquid is transferred into an autoclave, and the treatment is carried out for 16 hours at 200 ℃. And finally, cooling to room temperature, filtering, washing, and drying at 120 ℃ to obtain the final modified filler.
2) Preparation of an absorption layer:
weighing 7g of polyurethane resin and 3g of modified filler stirrer, stirring and mixing, and then hot-pressing at 170 ℃ and 1MPa to obtain a 200um film, namely an absorption layer.
3) Preparation of an absorption/reflection layer:
dispersing silver nanowires (length: 50 um; diameter: 50nm) in 10mg/ml concentration in 10% polyvinyl alcohol aqueous solution, treating the obtained film with plasma for 60s, then spraying silver nanowire dispersion on the surface of the film, drying, and spraying to a thickness of 5um to obtain an absorption/reflection layer
4) Preparing a multilayer electromagnetic shielding composite material:
and (3) laminating 5 absorption/reflection layers, and then carrying out hot pressing at the temperature of 170 ℃ and the pressure of 1MPa to obtain the multilayer electromagnetic shielding composite material. The shielding effectiveness is 67.1-82.6dB under the condition of 1-12 GHz, and the absorption efficiency is 93% under the condition of 9.5 GHz.
Example 6
1) Preparing modified filler:
firstly, 1g of nickel powder is added into methanol for ultrasonic dispersion for 3 hours, 1g of graphene oxide is added, ultrasonic treatment is continued for 3 hours, 30g of ferric chloride, 150g of sodium hydroxide and 3.75g of hydrazine hydrate are respectively added into the dispersion liquid for stirring for 4 hours, the mixed liquid is transferred into an autoclave, and the treatment is carried out for 16 hours at 200 ℃. And finally, cooling to room temperature, filtering, washing, and drying at 120 ℃ to obtain the final modified filler.
2) Preparation of an absorption layer:
7g of polyphenylene ether resin was weighed and mixed with 3g of a modified filler stirrer, followed by hot pressing at a temperature of 270 ℃ and a pressure of 1MPa to obtain a 200um film, i.e., an absorption layer.
4) Preparation of an absorption/reflection layer:
dispersing silver nanowires (length: 50um, diameter: 50nm) in 10mg/ml concentration in 10% polyvinyl alcohol aqueous solution, treating the obtained film with plasma for 60s, then spraying silver nanowire dispersion liquid on the surface of the film, drying, and spraying to a thickness of 5um to obtain an absorption/reflection layer
5) Preparing a multilayer electromagnetic shielding composite material:
and 5 absorbing/reflecting layers are laminated, and then hot-pressed at the temperature of 270 ℃ and the pressure of 1MPa to obtain the multilayer electromagnetic shielding composite material. The shielding effectiveness is 69.7-83.5dB under the condition of 1-12 GHz, and the absorption efficiency is 92% under the condition of 9.5 GHz.
While the present invention has been described in detail with respect to the preferred embodiments thereof, it is to be understood that the present invention is not limited to the details of construction and operation, but is capable of other forms and embodiments, and that the invention is capable of other uses and modifications within the spirit and scope of the appended claims. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The scope of the invention is defined by the claims and may include other embodiments that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.

Claims (9)

1. An electromagnetic shielding composite material is characterized by comprising an absorption layer and a reflection layer compounded on the absorption layer;
the absorbent layer includes a modified resin layer;
the thickness of the absorption layer is 50-200 mu m;
the modified resin comprises a resin and a modified filler;
the resin matrix of the modified resin comprises one or more of polyethylene resin, polypropylene resin, polyvinyl chloride resin, polyvinylidene fluoride resin, polyurethane resin and polyphenyl ether resin;
the mass ratio of the resin to the modified filler is (70-95): (5-30);
the modified filler is prepared from a filler A and a filler B, and specifically comprises the steps of mixing the filler A with a solvent, adding the filler B, continuously mixing, adding ferric chloride, alkali and hydrazine hydrate, mixing again, and reacting to obtain the modified filler;
the filler A comprises one or more of nickel powder, titanium carbide, expanded graphite, flake graphite and graphene nanosheets;
the filler B comprises graphene oxide and/or acidified carbon nanotubes;
the mass ratio of the filler A to the filler B is 1: (0.5 to 1);
the modified resin layer has an isolation structure;
the isolation structure is specifically formed by gathering the modified filler on the surface of the resin to form a net-shaped or layered isolation structure;
the reflective layer comprises a metal nanowire film layer;
the thickness of the reflecting layer is 1-5 mu m;
the electromagnetic shielding composite material has a multilayer structure with more than or equal to 4 layers;
the electromagnetic shielding composite material has an absorption layer and a reflection layer which are alternately laminated.
2. The electromagnetically shielding composite as claimed in claim 1, wherein said metal comprises one or more of gold, silver and copper.
3. The electromagnetically shielding composite material as claimed in claim 1, wherein the diameter of the metal nanowire is 50 to 200 nm;
the length of the metal nanowire is 10-50 mu m;
in the metal nanowire film layer, the metal nanowires have a shape structure which is stacked in a staggered mode.
4. A method for preparing an electromagnetic shielding composite material according to any one of claims 1 to 3, comprising the steps of:
1) mixing the filler A with a solvent, adding the filler B, continuously mixing, adding ferric chloride, alkali and hydrazine hydrate, mixing again, and reacting to obtain a modified filler;
2) stirring and mixing the modified filler and the resin obtained in the step, and then carrying out hot pressing to obtain a modified resin layer with an isolation structure;
3) and compounding the metal nanowire dispersion liquid subjected to the plasma treatment on the modified resin layer with the isolation structure to obtain the electromagnetic shielding composite material.
5. The production method according to claim 4, wherein the filler A comprises one or more of nickel powder, titanium carbide, expanded graphite, flake graphite, and graphene nanoplatelets;
the solvent comprises one or more of methanol, ethanol and glycol;
the mixing time is 1-3 h;
the filler B comprises graphene oxide and/or acidified carbon nanotubes;
the mass ratio of the filler A to the filler B is 1: (0.5 to 1);
the mass ratio of the filler A to the solvent is 1: (100-300).
6. The method of claim 4, wherein the means of mixing and continuing mixing comprises ultrasonic dispersion;
the continuous mixing time is 1-3 h;
the alkali comprises potassium hydroxide and/or sodium hydroxide;
the mass ratio of the ferric chloride to the filler B is (10-30): 1;
the mass ratio of the alkali to the ferric chloride is (3-5): 1;
the mass ratio of the hydrazine hydrate to the ferric chloride is 1: (8-10);
the remixing time is 2-4 h.
7. The preparation method according to claim 4, wherein the reaction temperature is 160-200 ℃;
the reaction time is 8-16 h;
the stirring and mixing time is 5-30 min;
the rotating speed of stirring and mixing is 30-120 rpm;
the hot pressing temperature is 140-270 ℃;
the pressure of hot pressing is 0.5-1 MPa.
8. The preparation method according to claim 4, wherein the concentration of the metal nanowire dispersion is 2 to 10 mg/ml;
the solvent of the metal nanowire dispersion liquid comprises ethanol, methanol, a polyvinyl alcohol aqueous solution with the mass fraction of 5%, a polyvinyl alcohol aqueous solution with the mass fraction of 7% or a polyvinyl alcohol aqueous solution with the mass fraction of 10%;
the plasma treatment time is 30-60 s;
the compound mode comprises spraying;
and a drying step is also included after the compounding.
9. Use of the electromagnetic shielding composite material of any one of claims 1 to 3 or the electromagnetic shielding composite material prepared by the preparation method of any one of claims 4 to 8 in the field of 5G communication or aerospace.
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