CN116023158A - Foam electromagnetic shielding material and preparation method thereof - Google Patents
Foam electromagnetic shielding material and preparation method thereof Download PDFInfo
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- CN116023158A CN116023158A CN202211456950.6A CN202211456950A CN116023158A CN 116023158 A CN116023158 A CN 116023158A CN 202211456950 A CN202211456950 A CN 202211456950A CN 116023158 A CN116023158 A CN 116023158A
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- 239000000463 material Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 239000006260 foam Substances 0.000 title claims abstract description 32
- 239000000203 mixture Substances 0.000 claims abstract description 98
- 241000723346 Cinnamomum camphora Species 0.000 claims abstract description 59
- 235000013399 edible fruits Nutrition 0.000 claims abstract description 59
- 239000000843 powder Substances 0.000 claims abstract description 56
- 238000002156 mixing Methods 0.000 claims abstract description 49
- DSSYKIVIOFKYAU-XCBNKYQSSA-N (R)-camphor Chemical compound C1C[C@@]2(C)C(=O)C[C@@H]1C2(C)C DSSYKIVIOFKYAU-XCBNKYQSSA-N 0.000 claims abstract description 43
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000002042 Silver nanowire Substances 0.000 claims abstract description 39
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229960000846 camphor Drugs 0.000 claims abstract description 28
- 229930008380 camphor Natural products 0.000 claims abstract description 28
- 238000005406 washing Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 15
- 240000008042 Zea mays Species 0.000 claims abstract description 14
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims abstract description 14
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 235000005822 corn Nutrition 0.000 claims abstract description 14
- 229920002545 silicone oil Polymers 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 28
- 238000000227 grinding Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 13
- 238000007873 sieving Methods 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 230000001351 cycling effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000035939 shock Effects 0.000 abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000007833 carbon precursor Substances 0.000 description 4
- 238000005187 foaming Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000006261 foam material Substances 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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- 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
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention provides a preparation method of a foam electromagnetic shielding material, which comprises the following steps: mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10 (0.5-1.5) to obtain mixture A, and collecting FeCl 3 Mixing with silicone oil according to the mass ratio of 10 (0.5-1.0) to obtain a mixture B, mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing for 24 hours at room temperature after mixing; adding silver nanowires, uniformly mixing to obtain a mixture C, and transferring the mixture C into a die to be compressed; curing the mixture C; transferring to a calciner, heating to 900 ℃ at a speed of 200 ℃/h, and preserving heat for 7-8h; cooling byRepeatedly washing with 0.2mol/L hydrochloric acid solution. The foam electromagnetic shielding material prepared by the invention takes the camphor fruit powder as a raw material, realizes effective utilization of waste resources, has high porosity and good shock resistance, has good electromagnetic shielding effect, and can be used in various industries.
Description
Technical Field
The invention belongs to the field of functional materials, and particularly relates to a preparation method of a foam electromagnetic shielding material.
Background
In recent years, with the rapid development of the electronic industry, the accuracy and sensitivity of the instrument have been greatly improved. Therefore, the electronic device is more and more easily interfered by external electromagnetic waves, so that the precise electronic device cannot work normally, and even information is stolen. The development of light weight and miniaturization of electronic instruments and equipment drives the development of electromagnetic shielding materials, and the development of the electromagnetic shielding materials gradually tends to be light weight and high-efficiency. The foam electromagnetic shielding material has the foam characteristics, can effectively resist vibration, and has shielding performance, so that the foam electromagnetic shielding material is widely paid attention. The commonly used methods for preparing carbon foam materials generally include two broad categories, foaming and templating. The foaming method is an early preparation method of carbon foam, and uses organic matters such as resin and the like as carbon precursors, and the carbon foam is obtained by pressing and forming, heating and melting at high temperature under inert atmosphere, and simultaneously slowly introducing inert gas. The foaming method can prepare micron-sized carbon foam, but multiple processes such as foaming, stabilizing, carbonizing and the like are needed, so that the production period is longer. The template method is the most common method for preparing the porous carbon material in recent years, and two different methods exist for preparing the carbon foam by the template method, namely, adding a carbon source into the porous template, removing the template to prepare the carbon foam, and removing the core to obtain the carbon foam by using a submicron polymer or inorganic substance as the core. The template method can prepare nanoscale carbon foam with small pore diameter, uniform pore distribution and high conductivity and pore volume. However, templates are typically removed by high concentration strong acid or strong base etches, increasing template material consumption.
The camphor tree is visible everywhere in the southern city, has large fruit quantity, does not generally serve any purpose, causes serious resource waste, and can be used as a carbon precursor by analyzing physicochemical properties after being measured. Therefore, the application explores a method for preparing the foam electromagnetic shielding material by using camphor tree fruits as raw materials and utilizing new resources.
Disclosure of Invention
The technical problems to be solved are as follows: the invention aims to provide a preparation method of a foam electromagnetic shielding material, which takes camphor fruit powder as a raw material, realizes effective utilization of waste resources, has high porosity and good shock resistance, has good electromagnetic shielding effect, and can be used in various industries.
The technical scheme is as follows: a preparation method of a foam electromagnetic shielding material comprises the following steps:
(1) Mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10 (0.5-1.5) to obtain mixture A, and collecting FeCl 3 Mixing with silicone oil according to the mass ratio of 10 (0.5-1.0) to obtain a mixture B, mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing for 24 hours at room temperature after mixing;
(2) Adding silver nanowires, uniformly mixing to obtain a mixture C, and transferring the mixture C into a die to be compressed;
(3) Curing the mixture C;
(4) Transferring to a calciner, heating to 900 ℃ at a speed of 200 ℃/h, and preserving heat for 7-8h;
(5) Cooling, and repeatedly washing with 0.2mol/L hydrochloric acid solution.
Preferably, the preparation method of the camphor fruit powder comprises the following steps: washing the camphor tree fruits, drying at 110 ℃, crushing, grinding, sieving with a 200-mesh sieve, and removing large particles.
Preferably, the mass ratio of the silver nanowires to the camphor fruit powder is 1 (50-60).
Preferably, the silver nanowires have an aspect ratio of 200-300.
Preferably, the curing in the step (3) adopts a step method, which is as follows: after heat cycling at 120℃for 2h, curing at 140℃for 2h, curing at 160℃for 2h, and finally curing at 180℃for 2h again.
The foam electromagnetic shielding material prepared by the preparation method of the foam electromagnetic shielding material.
The beneficial effects are that:
1. according to the invention, the camphor tree fruits are used as raw materials, and the raw materials are tested to be in line with the potential of being used as a carbon precursor, so that the camphor tree fruits are numerous and basically not utilized, and the resource waste is caused.
2. FeCl in the invention 3 The effect of (2) is to first dehydrate and then crosslink, and finally promote graphitization at carbonization temperature.
3. The invention uses silver nano wires as conductive filler, and on the other hand, the invention can play a supporting role in the macroscopic structure and the high-pore interconnection frame of the foam material, thereby improving the compression resistance.
4. The foam electromagnetic shielding material has high porosity, good shock resistance and good electromagnetic shielding effect.
Detailed Description
Pre-experiment:
the physical and chemical properties of the camphor fruit powder were analyzed, 11.55% moisture, 52.17% volatile matter, 14.95% ash, 21.33% fixed carbon. The organic compound content is high and reaches 74.87%, so that the organic compound can be used as a carbon precursor.
Example 1
A preparation method of a foam electromagnetic shielding material comprises the following steps:
(1) Mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10:0.5 to obtain a mixture A, and collecting FeCl 3 Mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing the mixture at room temperature for 24 hours; the preparation method of the camphor fruit powder comprises the following steps: washing the camphor tree fruits, drying at 110 ℃, crushing, grinding, sieving with a 200-mesh sieve, and removing large particles;
(2) Adding silver nanowires, uniformly mixing to obtain a mixture C, and transferring the mixture C into a die to be compressed; the mass ratio of the silver nanowires to the camphor fruit powder is 1:55; the length-diameter ratio of the silver nanowire is 200-300;
(3) And (3) curing the mixture C by a step method, wherein the curing comprises the following steps: after heat cycle at 120 ℃ for 2 hours, curing at 140 ℃ for 2 hours, curing at 160 ℃ for 2 hours, and finally curing at 180 ℃ for 2 hours again;
(4) Transferring to a calciner, heating to 900 ℃ at the speed of 200 ℃/h, and preserving heat for 7h;
(5) Cooling, and repeatedly washing with 0.2mol/L hydrochloric acid solution.
Example 2
A preparation method of a foam electromagnetic shielding material comprises the following steps:
(1) Mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10:1.0 to obtain a mixture A, and collecting FeCl 3 Mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing the mixture at room temperature for 24 hours; the preparation method of the camphor fruit powder comprises the following steps: washing the camphor tree fruits, drying at 110 ℃, crushing, grinding, sieving with a 200-mesh sieve, and removing large particles;
(2) Adding silver nanowires, uniformly mixing to obtain a mixture C, and transferring the mixture C into a die to be compressed; the mass ratio of the silver nanowires to the camphor fruit powder is 1:55; the length-diameter ratio of the silver nanowire is 200-300;
(3) And (3) curing the mixture C by a step method, wherein the curing comprises the following steps: after heat cycle at 120 ℃ for 2 hours, curing at 140 ℃ for 2 hours, curing at 160 ℃ for 2 hours, and finally curing at 180 ℃ for 2 hours again;
(4) Transferring to a calciner, heating to 900 ℃ at the speed of 200 ℃/h, and preserving heat for 7h;
(5) Cooling, and repeatedly washing with 0.2mol/L hydrochloric acid solution.
Example 3
A preparation method of a foam electromagnetic shielding material comprises the following steps:
(1) Mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10:1.5 to obtain a mixture A, and collecting FeCl 3 Mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing the mixture at room temperature for 24 hours; the preparation method of the camphor fruit powder comprises the following steps: washing the camphor tree fruits, drying at 110 ℃, crushing, grinding, sieving with a 200-mesh sieve, and removing large particles;
(2) Adding silver nanowires, uniformly mixing to obtain a mixture C, and transferring the mixture C into a die to be compressed; the mass ratio of the silver nanowires to the camphor fruit powder is 1:55; the length-diameter ratio of the silver nanowire is 200-300;
(3) And (3) curing the mixture C by a step method, wherein the curing comprises the following steps: after heat cycle at 120 ℃ for 2 hours, curing at 140 ℃ for 2 hours, curing at 160 ℃ for 2 hours, and finally curing at 180 ℃ for 2 hours again;
(4) Transferring to a calciner, heating to 900 ℃ at the speed of 200 ℃/h, and preserving heat for 7h;
(5) Cooling, and repeatedly washing with 0.2mol/L hydrochloric acid solution.
Example 4
A preparation method of a foam electromagnetic shielding material comprises the following steps:
(1) Mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10:1.0 to obtain a mixture A, and collecting FeCl 3 Mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing the mixture at room temperature for 24 hours; the preparation method of the camphor fruit powder comprises the following steps: washing the camphor tree fruits, drying at 110 ℃, crushing, grinding, sieving with a 200-mesh sieve, and removing large particles;
(2) Adding silver nanowires, uniformly mixing to obtain a mixture C, and transferring the mixture C into a die to be compressed; the mass ratio of the silver nanowires to the camphor fruit powder is 1:55; the length-diameter ratio of the silver nanowire is 200-300;
(3) And (3) curing the mixture C by a step method, wherein the curing comprises the following steps: after heat cycle at 120 ℃ for 2 hours, curing at 140 ℃ for 2 hours, curing at 160 ℃ for 2 hours, and finally curing at 180 ℃ for 2 hours again;
(4) Transferring to a calciner, heating to 900 ℃ at the speed of 200 ℃/h, and preserving heat for 7h;
(5) Cooling, and repeatedly washing with 0.2mol/L hydrochloric acid solution.
Example 5
A preparation method of a foam electromagnetic shielding material comprises the following steps:
(1) Mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10:1.0 to obtain a mixture A, and collecting FeCl 3 Mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing the mixture at room temperature for 24 hours; the preparation method of the camphor fruit powder comprises the following steps: washing Cinnamomum camphora fruit, oven drying at 110deg.C, pulverizing, grinding, sieving with 200 mesh sieveRemoving large particles;
(2) Adding silver nanowires, uniformly mixing to obtain a mixture C, and transferring the mixture C into a die to be compressed; the mass ratio of the silver nanowires to the camphor fruit powder is 1:55; the length-diameter ratio of the silver nanowire is 200-300;
(3) And (3) curing the mixture C by a step method, wherein the curing comprises the following steps: after heat cycle at 120 ℃ for 2 hours, curing at 140 ℃ for 2 hours, curing at 160 ℃ for 2 hours, and finally curing at 180 ℃ for 2 hours again;
(4) Transferring to a calciner, heating to 900 ℃ at the speed of 200 ℃/h, and preserving heat for 7h;
(5) Cooling, and repeatedly washing with 0.2mol/L hydrochloric acid solution.
Example 6
A preparation method of a foam electromagnetic shielding material comprises the following steps:
(1) Mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10:1.0 to obtain a mixture A, and collecting FeCl 3 Mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing the mixture at room temperature for 24 hours; the preparation method of the camphor fruit powder comprises the following steps: washing the camphor tree fruits, drying at 110 ℃, crushing, grinding, sieving with a 200-mesh sieve, and removing large particles;
(2) Adding silver nanowires, uniformly mixing to obtain a mixture C, and transferring the mixture C into a die to be compressed; the mass ratio of the silver nanowires to the camphor fruit powder is 1:55; the length-diameter ratio of the silver nanowire is 200-300;
(3) And (3) curing the mixture C by a step method, wherein the curing comprises the following steps: after heat cycle at 120 ℃ for 2 hours, curing at 140 ℃ for 2 hours, curing at 160 ℃ for 2 hours, and finally curing at 180 ℃ for 2 hours again;
(4) Transferring to a calciner, heating to 900 ℃ at the speed of 200 ℃/h, and preserving heat for 7h;
(5) Cooling, and repeatedly washing with 0.2mol/L hydrochloric acid solution.
Example 7
A preparation method of a foam electromagnetic shielding material comprises the following steps:
(1) Mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10:1.0 to obtain a mixture A, and collecting FeCl 3 Mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing the mixture at room temperature for 24 hours; the preparation method of the camphor fruit powder comprises the following steps: washing the camphor tree fruits, drying at 110 ℃, crushing, grinding, sieving with a 200-mesh sieve, and removing large particles;
(2) Adding silver nanowires, uniformly mixing to obtain a mixture C, and transferring the mixture C into a die to be compressed; the mass ratio of the silver nanowires to the camphor fruit powder is 1:55; the length-diameter ratio of the silver nanowire is 200-300;
(3) And (3) curing the mixture C by a step method, wherein the curing comprises the following steps: after heat cycle at 120 ℃ for 2 hours, curing at 140 ℃ for 2 hours, curing at 160 ℃ for 2 hours, and finally curing at 180 ℃ for 2 hours again;
(4) Transferring to a calciner, heating to 900 ℃ at the speed of 200 ℃/h, and preserving heat for 7h;
(5) Cooling, and repeatedly washing with 0.2mol/L hydrochloric acid solution.
Example 8
A preparation method of a foam electromagnetic shielding material comprises the following steps:
(1) Mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10:1.0 to obtain a mixture A, and collecting FeCl 3 Mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing the mixture A and the mixture B at room temperature for 24 hours after mixing; the preparation method of the camphor fruit powder comprises the following steps: washing the camphor tree fruits, drying at 110 ℃, crushing, grinding, sieving with a 200-mesh sieve, and removing large particles;
(2) Adding silver nanowires, uniformly mixing to obtain a mixture C, and transferring the mixture C into a die to be compressed; the mass ratio of the silver nanowires to the camphor fruit powder is 1:55; the length-diameter ratio of the silver nanowire is 200-300;
(3) And (3) curing the mixture C by a step method, wherein the curing comprises the following steps: after heat cycle at 120 ℃ for 2 hours, curing at 140 ℃ for 2 hours, curing at 160 ℃ for 2 hours, and finally curing at 180 ℃ for 2 hours again;
(4) Transferring to a calciner, heating to 900 ℃ at the speed of 200 ℃/h, and preserving heat for 7h;
(5) Cooling, and repeatedly washing with 0.2mol/L hydrochloric acid solution.
Example 9
A preparation method of a foam electromagnetic shielding material comprises the following steps:
(1) Mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10:1.0 to obtain a mixture A, and collecting FeCl 3 Mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing the mixture at room temperature for 24 hours; the preparation method of the camphor fruit powder comprises the following steps: washing the camphor tree fruits, drying at 110 ℃, crushing, grinding, sieving with a 200-mesh sieve, and removing large particles;
(2) Adding silver nanowires, uniformly mixing to obtain a mixture C, and transferring the mixture C into a die to be compressed; the mass ratio of the silver nanowires to the camphor fruit powder is 1:50; the length-diameter ratio of the silver nanowire is 200-300;
(3) And (3) curing the mixture C by a step method, wherein the curing comprises the following steps: after heat cycle at 120 ℃ for 2 hours, curing at 140 ℃ for 2 hours, curing at 160 ℃ for 2 hours, and finally curing at 180 ℃ for 2 hours again;
(4) Transferring to a calciner, heating to 900 ℃ at a speed of 200 ℃/h, and preserving heat for 7-8h;
(5) Cooling, and repeatedly washing with 0.2mol/L hydrochloric acid solution.
Example 10
A preparation method of a foam electromagnetic shielding material comprises the following steps:
(1) Mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10:1.0 to obtain a mixture A, and collecting FeCl 3 Mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing the mixture at room temperature for 24 hours; the preparation method of the camphor fruit powder comprises the following steps: washing the camphor tree fruits, drying at 110 ℃, crushing, grinding, sieving with a 200-mesh sieve, and removing large particles;
(2) Adding silver nanowires, uniformly mixing to obtain a mixture C, and transferring the mixture C into a die to be compressed; the mass ratio of the silver nanowires to the camphor fruit powder is 1:60; the length-diameter ratio of the silver nanowire is 200-300;
(3) And (3) curing the mixture C by a step method, wherein the curing comprises the following steps: after heat cycle at 120 ℃ for 2 hours, curing at 140 ℃ for 2 hours, curing at 160 ℃ for 2 hours, and finally curing at 180 ℃ for 2 hours again;
(4) Transferring to a calciner, heating to 900 ℃ at a speed of 200 ℃/h, and preserving heat for 7-8h;
(5) Cooling, and repeatedly washing with 0.2mol/L hydrochloric acid solution.
Comparative example 1
The difference between this example and example 2 is that no silver nanowires are included, specifically as follows:
a preparation method of a foam electromagnetic shielding material comprises the following steps:
(1) Mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10:1.0 to obtain a mixture A, and collecting FeCl 3 Mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing the mixture at room temperature for 24 hours after mixing to obtain a mixture C; the preparation method of the camphor fruit powder comprises the following steps: washing the camphor tree fruits, drying at 110 ℃, crushing, grinding, sieving with a 200-mesh sieve, and removing large particles;
(2) Moving into a mould to be compressed;
(3) And (3) curing the mixture C by a step method, wherein the curing comprises the following steps: after heat cycle at 120 ℃ for 2 hours, curing at 140 ℃ for 2 hours, curing at 160 ℃ for 2 hours, and finally curing at 180 ℃ for 2 hours again;
(4) Transferring to a calciner, heating to 900 ℃ at the speed of 200 ℃/h, and preserving heat for 7h;
(5) Cooling, and repeatedly washing with 0.2mol/L hydrochloric acid solution.
The performance index of the foam electromagnetic shielding material of the invention is detected according to various national standards, and the results are shown in the following table 1.
TABLE 1 Performance index of the foam electromagnetic shielding material of the invention
Claims (6)
1. A preparation method of a foam electromagnetic shielding material is characterized by comprising the following steps: the method comprises the following steps:
(1) Mixing Cinnamomum camphora fruit powder and corn powder at a mass ratio of 10 (0.5-1.5) to obtain mixture A, and collecting FeCl 3 Mixing with silicone oil according to the mass ratio of 10 (0.5-1.0) to obtain a mixture B, mixing the mixture A and the mixture B according to the mass ratio of 1:1, and stabilizing for 24 hours at room temperature after mixing;
(2) Adding silver nanowires, uniformly mixing to obtain a mixture C, and transferring the mixture C into a die to be compressed;
(3) Curing the mixture C;
(4) Transferring to a calciner, heating to 900 ℃ at a speed of 200 ℃/h, and preserving heat for 7-8h;
(5) Cooling, and repeatedly washing with 0.2mol/L hydrochloric acid solution.
2. The method for preparing the foam electromagnetic shielding material according to claim 1, wherein: the preparation method of the camphor fruit powder comprises the following steps: washing the camphor tree fruits, drying at 110 ℃, crushing, grinding, sieving with a 200-mesh sieve, and removing large particles.
3. The method for preparing the foam electromagnetic shielding material according to claim 1, wherein: the mass ratio of the silver nanowires to the camphor fruit powder is 1 (50-60).
4. The method for preparing the foam electromagnetic shielding material according to claim 1, wherein: the length-diameter ratio of the silver nanowire is 200-300.
5. The method for preparing the foam electromagnetic shielding material according to claim 1, wherein: the curing in the step (3) adopts a step method, which is as follows: after heat cycling at 120℃for 2h, curing at 140℃for 2h, curing at 160℃for 2h, and finally curing at 180℃for 2h again.
6. A foamed electromagnetic shielding material produced by the production method of a foamed electromagnetic shielding material according to any one of claims 1 to 5.
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