CN111943274A - Preparation method of green electromagnetic shielding building material - Google Patents
Preparation method of green electromagnetic shielding building material Download PDFInfo
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- 229910021389 graphene Inorganic materials 0.000 claims abstract description 46
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000002074 nanoribbon Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 25
- 239000002131 composite material Substances 0.000 claims abstract description 22
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- 229910021641 deionized water Inorganic materials 0.000 claims description 32
- 238000010438 heat treatment Methods 0.000 claims description 25
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 24
- 239000013078 crystal Substances 0.000 claims description 24
- 238000003760 magnetic stirring Methods 0.000 claims description 20
- 229910021577 Iron(II) chloride Inorganic materials 0.000 claims description 15
- 239000011259 mixed solution Substances 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
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- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 9
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- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 claims description 3
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 238000010790 dilution Methods 0.000 claims description 3
- 239000012895 dilution Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000004108 freeze drying Methods 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 3
- 230000008014 freezing Effects 0.000 claims description 3
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims description 3
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- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 229910010272 inorganic material Inorganic materials 0.000 description 1
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- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/08—Ferroso-ferric oxide [Fe3O4]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/184—Preparation
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- 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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Composite Materials (AREA)
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- Microelectronics & Electronic Packaging (AREA)
- Building Environments (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention provides a preparation method of a green electromagnetic shielding building material, which comprises the following operation steps: selecting a proper amount of carbon nano tubes, and cutting the carbon nano tubes by adopting a chemical longitudinal cutting method. By mixing nano Fe3O4Compounding the particles and the graphene oxide nanoribbon to prepare a ferroferric oxide and graphene oxide nanoribbon composite material, and reducing to obtain Fe3O4Composite with graphene nanoribbons by reacting with Fe3O4Adjusting the load to prepare different Fe3O4Loaded ferroferric oxide and graphiteThe wave-absorbing performance of the alkene nanobelt composite material in the continuous thickness of 0.5mm-5mm is calculated, the material with the F: G ratio of 1:1 and the 2:1 ratio has the best wave-absorbing performance, and the optimal load capacity and the optimal thickness of Fe3O4 can be determined. The green electromagnetic shielding building material has the characteristics of light weight and wide wave absorption width, and is convenient for industrial large-scale production. The system can be used in a multimedia indoor venue with a large number of electronic devices, so that the health of visitors can be protected, and the visiting experience can be improved.
Description
Technical Field
The invention relates to the field of building materials, in particular to a preparation method of a green electromagnetic shielding building material.
Background
Building materials are various materials used in construction works, and the building materials are various in types, and are roughly classified into: inorganic materials including metallic materials and non-metallic materials such as natural stone, burnt earth products, cement, concrete, silicate products, and the like; organic materials including plant materials, synthetic polymer materials and asphalt materials, and composite materials including asphalt concrete, polymer concrete and the like, which are generally compounded by inorganic non-metallic materials and organic materials.
The electromagnetic shielding material belongs to a novel building material and is mainly used as a filler of a conductive polymer material, ferrite in the traditional electromagnetic shielding material has the advantages of strong absorption, wide frequency band, strong corrosion resistance, low cost and the like, but certain defects still exist, the ferrite has high magnetic conductivity and small dielectric constant and is used as a wave-absorbing matching layer, the frequency band of the material in a low frequency band can be widened, the ferrite is used as the wave-absorbing material alone and is difficult to meet the requirements of wide absorption frequency band and small density, and meanwhile, the wave-absorbing material has high density, poor high temperature characteristic and is not environment-friendly enough.
Therefore, there is a need to provide a method for preparing a green electromagnetic shielding building material to solve the above technical problems.
Disclosure of Invention
The invention provides a preparation method of a green electromagnetic shielding building material, which solves the problems that the wave-absorbing material in the traditional electromagnetic shielding building material has high density, poor high-temperature characteristic and environmental protection, and is difficult to meet the use requirements of people.
In order to solve the technical problems, the preparation method of the green electromagnetic shielding building material provided by the invention comprises the steps of S1, selecting 1g of carbon nano tube, mixing the carbon nano tube with 98% concentrated sulfuric acid, standing for 1h at room temperature to fully mix the carbon nano tube and the concentrated sulfuric acid, and then placing the mixture into a constant-temperature heating magnetic stirring pot for heating to further mix the solution;
s2, after 0.5h of reaction, 1g of KMnO was added every 10min4Then keeping the constant temperature for reacting for 1.5h, and naturally cooling to a normal temperature state after the reaction is finished to obtain a solution A;
s3, adding the solution A obtained in the step S2 into a mixed solution of deionized water and hydrogen peroxide and ice water, standing for 2 hours to enable the solution to be layered, and removing supernatant to obtain a solution B;
s4, carrying out ultrasonic washing on the solution B obtained in the step S3 by using a dilute hydrochloric acid solution and dilute deionized water in sequence until the supernatant of the solution B is neutral, transferring the obtained deposit to a beaker, and adding a proper amount of deionized water to prepare a 1mol/L graphene oxide nanoribbon solution;
s5, taking a proper amount of the solution of the graphene oxide nanobelt prepared in the S4, adding deionized water for dilution and carrying out ultrasonic treatment, and taking a proper amount of FeCl3With FeCl2Adding a proper amount of deionized water into the crystal to prepare a mixed solution, pouring the mixed solution into the ultrasonically-finished graphene oxide nanobelt solution, placing the solution into a constant-temperature heating magnetic stirring pot, and performing magnetic stirring;
s6 and S5, heating the water bath to 85 ℃, adding a proper amount of ammonia water into the solution, adjusting the pH value of the solution to 10, continuing heating the solution in the water bath at 85 ℃ for reacting for 45min, stopping heating after the reaction is finished, and naturally cooling the solution to the normal temperature state to finally obtain a solution C;
s7, washing the solution C obtained in the step S6 with deionized water until the pH value is 7, then adding a proper amount of deionized water, and performing freeze drying to obtain a product, namely the nano ferroferric oxide particle and graphene oxide nanoribbon composite material;
s8, putting the nano ferroferric oxide particles and graphene oxide nanoribbon composite material sample prepared in the step S7 into a container, adding a proper amount of hydrazine hydrate, putting the container into an oven, and drying for 24 hours to finally obtain nano ferroferric oxide particles and graphene nanoribbon composite material powder
Preferably, the heating temperature of the water bath in the S1 is 65 ℃, and the solution can be fully reacted by magnetic stirring while the water bath is heated.
Preferably, KMnO in S24A total of six additions were made, and the amount of each addition was kept consistent, and magnetic stirring was continued after the addition to allow the solution to react sufficiently.
Preferably, the volume fraction of the deionized water and hydrogen peroxide ice-water mixed solution in S3 is 30%, and the preparation method includes adding 500ml of deionized water into 10ml of hydrogen peroxide, and then putting the solution into a refrigerator for freezing to finally obtain a mixture of the deionized water and the hydrogen peroxide ice-water with the volume fraction of 30%.
Preferably, FeCl in S53With FeCl2The crystal mixed solution is prepared according to the mol ratio of ferroferric oxide to graphene oxide nanoribbons, and proper amount of FeCl is weighed during preparation3Crystals and FeCl2Placing the crystal in a small beaker, adding deionized water, and finally obtaining FeCl3With FeCl2And (4) mixing crystals into a solution.
Preferably, in the step S6, when the solution is heated in a water bath at 85 ℃, the heating reaction is continued for 45min, so that the solution is fully reacted and mixed.
Preferably, the temperature of the oven in the S8 is kept at 90 ℃, and the reaction time in the oven is controlled at 24 h.
Preferably, the constant temperature heating magnetic stirring pot includes the organism, the top of organism is provided with the protection casing, the equal fixedly connected with installation axle of the left and right sides at organism top, the mounting groove has all been seted up to the left and right sides of protection casing bottom, the outside of protection casing is provided with the elastic layer, the equal fixedly connected with handle of the left and right sides of protection casing outside.
Compared with the related art, the preparation method of the green electromagnetic shielding building material provided by the invention has the following beneficial effects:
the invention provides a preparation method of a green electromagnetic shielding building material, and the electromagnetic shielding building materialBuilding material, by mixing nano Fe3O4Compounding the particles and the graphene nanoribbons to prepare the ferroferric oxide and graphene nanoribbon composite material, analyzing the wave-absorbing performance of the ferroferric oxide and graphene nanoribbon composite material before and after reduction, and obtaining Fe after reduction3O4The composite material has better wave-absorbing performance with the graphene nanoribbon composite material, so that the whole density is smaller, the high-temperature characteristic is obviously improved, and meanwhile, different Fe is subjected to3O4The wave-absorbing performance of the loaded ferroferric oxide and graphene nanoribbon composite material with different thicknesses is calculated, the material with the F: G-1: 1 and 2:1 ratios has the best wave-absorbing performance, and determination of Fe is facilitated3O4The composite material has the advantages of optimal load capacity and optimal thickness, can well meet the use requirements of people, has the advantages of light weight, environmental protection and wide wave absorption width, is convenient for industrial large-scale production, and has wide development space and very good application prospect.
Drawings
Fig. 1 is a SEM schematic view of a graphene oxide nanoribbon in a method for preparing a green electromagnetic shielding building material according to the present invention;
fig. 2 is a SEM schematic view of a nano ferroferric oxide particle-loaded graphene oxide nanoribbon in the method for preparing a green electromagnetic shielding building material according to the present invention;
fig. 3 is a SEM schematic view of a nano ferroferric oxide particle-loaded graphene nanoribbon in the method for preparing a green electromagnetic shielding building material according to the present invention;
FIG. 4 is a graph showing the electromagnetic wave reflectivity at 2-14GHz of a continuous thickness sample in the method for manufacturing a green electromagnetic shielding building material according to the present invention;
fig. 5 is a schematic structural diagram of a fifth embodiment provided for the method for preparing a green electromagnetic shielding building material provided by the present invention.
Reference numbers in the figures: 1. organism, 2, protection casing, 3, installation axle, 4, mounting groove, 5, elastic layer, 6, handle.
Detailed Description
First embodiment
The invention is further described with reference to the following figures and embodiments.
Please refer to fig. 1, fig. 2, fig. 3 and fig. 4 in combination, wherein fig. 1 is a schematic SEM diagram of a graphene oxide nanoribbon in the method for preparing a green electromagnetic shielding building material according to the present invention; fig. 2 is a SEM schematic view of a nano ferroferric oxide particle-loaded graphene oxide nanoribbon in the method for preparing a green electromagnetic shielding building material according to the present invention; fig. 3 is a SEM schematic view of a nano ferroferric oxide particle-loaded graphene nanoribbon in the method for preparing a green electromagnetic shielding building material according to the present invention; FIG. 4 is a simulation diagram of the electromagnetic wave reflectivity at 2-14GHz of a continuous thickness sample in the preparation method of the green electromagnetic shielding building material provided by the invention. The preparation method of the green electromagnetic shielding building material comprises the following operation steps:
s1, selecting a proper amount of carbon nanotubes, mixing the carbon nanotubes with 98% concentrated sulfuric acid, standing for 1 hour at room temperature to enable the carbon nanotubes and the concentrated sulfuric acid to be fully mixed, and then heating the mixture in a constant-temperature heating magnetic stirring pot to enable the interior of the solution to further react;
s2, after the reaction is carried out for 0.5h, KMnO is added every 10min4Adding the solution A for six times, keeping the constant temperature for reacting for 1.5h, and naturally cooling to a normal temperature state after the reaction is finished to obtain a solution A;
s3, adding the solution A obtained in the step S2 into a mixed solution of deionized water and hydrogen peroxide and ice water, standing for 2 hours to enable the solution to be layered, and removing supernatant to obtain a solution B;
s4, carrying out ultrasonic washing on the solution B obtained in the step S3 by using a dilute hydrochloric acid solution and dilute deionized water in sequence until the supernatant of the solution B is neutral, transferring the obtained deposit into a beaker, and adding a proper amount of deionized water to prepare a 1mol/L graphene oxide nanobelt solution;
s5, taking a proper amount of the solution of the graphene oxide nanobelt prepared in the S4, adding deionized water for dilution and carrying out ultrasonic treatment, and taking a proper amount of FeCl3With FeCl2Adding a proper amount of deionized water into the crystal, pouring the crystal into the ultrasonically finished graphene oxide nanobelt solution, and placing the graphene oxide nanobelt solution into the ultrasonic-finished graphene oxide nanobelt solutionHeating the mixture in a magnetic stirring pot at constant temperature, and performing magnetic stirring;
s6 and S5, heating the water bath to 85 ℃, adding a proper amount of ammonia water into the solution, adjusting the pH value of the solution to 10, continuing heating the solution in the water bath at 85 ℃ for reacting for 45min, stopping heating after the reaction is finished, and naturally cooling the solution to the normal temperature state to finally obtain a solution C;
s7, washing the solution C obtained in the step S6 with deionized water until the pH value is 7, then adding a proper amount of deionized water, and performing freeze drying to obtain a product, namely the nano ferroferric oxide particle and graphene oxide nanoribbon composite material;
s8, putting the nano ferroferric oxide particles and graphene oxide nanoribbon composite material sample prepared in the step S7 into a container, adding a proper amount of hydrazine hydrate, and then putting the container into an oven for drying treatment to finally obtain nano ferroferric oxide particles and graphene nanoribbon composite material powder.
The heating temperature of the water bath in the S1 is 65 ℃, and the solution can be fully mixed by magnetic stirring while the water bath is heated.
KMnO in S24A total of six additions were made, and the amount of each addition was kept consistent, and magnetic stirring was continued after the addition to allow the solution to react sufficiently.
The volume fraction of the deionized water and hydrogen peroxide ice-water mixed solution in the S3 is 30%, and the preparation method comprises the steps of adding 500ml of deionized water into 10ml of hydrogen peroxide, and then putting the solution into a refrigerator for freezing to finally obtain a mixture of the deionized water and the hydrogen peroxide ice-water with the volume fraction of 30%.
FeCl in S53With FeCl2The crystal mixed solution is prepared according to the mol ratio of ferroferric oxide to graphene oxide nanoribbons, and proper amount of FeCl is weighed during preparation3Crystals and FeCl2Placing the crystal in a small beaker, adding deionized water, and finally obtaining FeCl3With FeCl2And (4) mixing crystals into a solution.
In the S6, when the solution is heated in a water bath at 85 ℃, the solution needs to be heated continuously for reaction for 45min, so that the solution is fully reacted and mixed.
The temperature of the oven in the S8 is kept at 90 ℃, and the reaction time in the oven is controlled at 24 h.
Constant temperature heating magnetic stirring pot includes the organism, the top of organism is provided with the protection casing, the equal fixedly connected with installation axle of the left and right sides at organism top, the mounting groove has all been seted up to the left and right sides of protection casing bottom, the outside of protection casing is provided with the elastic layer, the equal fixedly connected with handle of the left and right sides of protection casing outside.
It is apparent from fig. 1 that the tube shape has been axially cut into a ribbon shape, illustrating that the carbon nanotubes are cut into graphene oxide nanoribbons by strong acid, which have a width of about 200 nm;
from FIG. 2, Fe is evident3O4Is wrapped in a graphene oxide nano belt to form a nano ferroferric oxide particle and graphene nano belt composite material, and the loaded Fe can be seen3O4The diameter of the particles is about 30 nm;
as can be seen from fig. 3, the black particles are loaded on the strip, and the SEM image is unchanged from that before reduction, which shows that the reduction process has no effect on the ferroferric oxide particles loaded on the graphene nanoribbon;
as can be seen from FIG. 4, the maximum reflection loss values of the ferroferric oxide and graphene nanoribbon composite materials with F: G being 1:1 and 2:1 can reach below-10 dB, the maximum reflection losses of the ferroferric oxide and graphene nanoribbon composite materials with the thickness of 5mm are respectively-11.7 dB and-11.8 dB, and the bandwidths of RL < -10dB are respectively 1.4GHz (6.2 GHz to 7.6GHz) and 1.5GHz (6.3 GHz to 7.8 GHz).
Second embodiment
Based on the first embodiment of the present invention, a method for preparing a green electromagnetic shielding building material is provided, and the second embodiment of the present invention provides another method for preparing a green electromagnetic shielding building material, wherein the second embodiment does not hinder the independent implementation of the technical solution of the first embodiment.
Specifically, the difference of the preparation method of the other green electromagnetic shielding building material provided by the invention is that:
the embodiment is different from the first embodiment in that in S5, the molar ratio of ferroferric oxide to graphene oxide nanoribbons is 2:1, respectively weighing appropriate amount of FeCl3Crystals and FeCl2The crystal, otherwise the same as in the first example, gave a final sample of F: G ═ 2: 1.
Third embodiment
Based on the first embodiment of the present invention, a method for preparing a green electromagnetic shielding building material is provided, and the third embodiment of the present invention provides another method for preparing a green electromagnetic shielding building material, wherein the third embodiment does not hinder the independent implementation of the technical solution of the first embodiment.
Specifically, the difference of the preparation method of the other green electromagnetic shielding building material provided by the invention is that:
the embodiment is different from the first embodiment in that in S5, the molar ratio of ferroferric oxide to graphene oxide nanoribbons is 4:1, the same as the first embodiment except that appropriate amounts of FeCl3 crystal and FeCl2 crystal were weighed, respectively, and the final sample was F: G ═ 4: 1.
Fourth embodiment
Based on the first embodiment of the present invention, a method for preparing a green electromagnetic shielding building material is provided, and the fourth embodiment of the present invention provides another method for preparing a green electromagnetic shielding building material, wherein the fourth embodiment does not hinder the independent implementation of the technical solution of the first embodiment.
Specifically, the difference of the preparation method of the other green electromagnetic shielding building material provided by the invention is that:
the embodiment is different from the first embodiment in that in S5, the molar ratio of ferroferric oxide to graphene oxide nanoribbons is 8:1, respectively weighing appropriate amount of FeCl3Crystals and FeCl2The crystal, otherwise identical to the first example, gave a final sample of F: G ═ 8: 1.
Fifth embodiment
Based on the first embodiment of the present invention, a method for preparing a green electromagnetic shielding building material is provided, and the fifth embodiment of the present invention provides another method for preparing a green electromagnetic shielding building material, wherein the fifth embodiment does not hinder the independent implementation of the technical solution of the first embodiment.
Specifically, the difference of the preparation method of the other green electromagnetic shielding building material provided by the invention is that:
be used for S1 with carry out magnetic stirring to solution in the S5, constant temperature heating magnetic stirring pot includes organism 1, the top of organism 1 is provided with protection casing 2, the equal fixedly connected with installation axle 3 in the left and right sides at organism 1 top, mounting groove 4 has all been seted up to the left and right sides of protection casing 2 bottom, the outside of protection casing 2 is provided with elastic layer 5, the equal fixedly connected with handle 6 in the left and right sides of protection casing 2 outside.
The protection cover 2 is arranged at the top of the machine body 1, and plays a role in protecting the machine body 1, so that components at the top of the machine body 1, such as a pot body and a support, are positioned in the protection cover 2, when the protection cover 2 is not used, the protection cover 2 is arranged on the machine body 1, the components at the top of the machine body 1 are isolated from the external environment, and the functions of collision prevention, dust prevention, water prevention and the like can be achieved, when the protection cover 2 is arranged, the protection cover 2 can be stably arranged at the top of the machine body 1 by only holding the handle 6 and applying an acting force upwards, so that the protection cover 2 can be separated from the machine body 1, the installation shaft 3 is matched with the installation groove 4, when the protection cover 2 is arranged, the protection cover 2 is clamped in a matching way, the elastic layer 5 is made of an elastic material, such as rubber, silica gel or elastic fiber, thereby preventing damage to components on the body 1.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The preparation method of the green electromagnetic shielding building material is characterized by comprising the following operation steps of:
s1, selecting a proper amount of carbon nanotubes, mixing the carbon nanotubes with 98% concentrated sulfuric acid, standing for 1 hour at room temperature to fully mix the carbon nanotubes and the concentrated sulfuric acid, and then heating the mixture in a constant-temperature heating magnetic stirring pot;
s2, after 0.5h, KMnO is added every 10min4Adding the solution A for six times, keeping the constant temperature for reacting for 1.5h, and naturally cooling to a normal temperature state after the reaction is finished to obtain a solution A;
s3, adding the solution A obtained in the step S2 into a mixed solution of deionized water and hydrogen peroxide and ice water, standing for 2 hours to enable the solution to be layered, and removing supernatant to obtain a solution B;
s4, carrying out ultrasonic washing on the solution B obtained in the step S3 by using a dilute hydrochloric acid solution and dilute deionized water in sequence until the supernatant of the solution B is neutral, transferring the obtained deposit into a beaker, and adding a proper amount of deionized water to prepare a 1mol/L graphene oxide nanobelt solution;
s5, taking a proper amount of the solution of the graphene oxide nanobelt prepared in the S4, adding deionized water for dilution and carrying out ultrasonic treatment, and taking a proper amount of FeCl3With FeCl2Adding a proper amount of deionized water into the crystal, pouring the crystal into the ultrasonically finished graphene oxide nanobelt solution, placing the crystal into a constant-temperature heating magnetic stirring pot, and performing magnetic stirring;
s6 and S5, heating the water bath to 85 ℃, adding a proper amount of ammonia water into the solution, adjusting the pH value of the solution to 10, continuing heating the solution in the water bath at 85 ℃ for reacting for 45min, stopping heating after the reaction is finished, and naturally cooling the solution to the normal temperature state to finally obtain a solution C;
s7, washing the solution C obtained in the step S6 with deionized water until the pH value is 7, then adding a proper amount of deionized water, and performing freeze drying to obtain a product, namely the nano ferroferric oxide particle and graphene oxide nanoribbon composite material;
s8, putting the nano ferroferric oxide particles and graphene oxide nanoribbon composite material sample prepared in the step S7 into a container, adding a proper amount of hydrazine hydrate, and then putting the container into an oven for drying treatment to finally obtain nano ferroferric oxide particles and graphene nanoribbon composite material powder.
2. The method for preparing a green electromagnetic shielding building material of claim 1, wherein the heating temperature of the water bath in S1 is 65 ℃ and the solution is fully mixed with magnetic stirring while the water bath is heated.
3. The method for preparing a green electromagnetic shielding building material according to claim 1, wherein KMnO in S24A total of six additions were made, and the amount of each addition was kept consistent, and magnetic stirring was continued after the addition to allow the solution to react sufficiently.
4. The preparation method of the green electromagnetic shielding building material of claim 1, wherein the volume fraction of the deionized water and hydrogen peroxide ice water mixed solution in S3 is 30%, and the preparation method comprises adding 500ml of deionized water into 10ml of hydrogen peroxide, and then putting the solution into a freezer for freezing to obtain the ionic water and hydrogen peroxide ice water mixture with the volume fraction of 30%.
5. The method for preparing a green electromagnetic shielding building material of claim 1, wherein FeCl in S53With FeCl2The crystal mixed solution is prepared according to the mol ratio of ferroferric oxide to graphene oxide nanoribbons, and proper amount of FeCl is weighed during preparation3Crystals and FeCl2Placing the crystal in a small beaker, adding deionized water, and finally obtaining FeCl3With FeCl2And (4) mixing crystals into a solution.
6. The method for preparing a green electromagnetic shielding building material of claim 1, wherein the solution is heated in a water bath at 85 ℃ for 45min in S6, so that the solution is fully reacted and mixed.
7. The method for preparing a green electromagnetic shielding building material of claim 1, wherein the temperature of the oven in S8 is maintained at 90 ℃, and the reaction time in the oven is controlled at 24 h.
8. The method for preparing a green electromagnetic shielding building material according to claim 1, wherein the constant temperature heating magnetic stirring kettle comprises a machine body, a protective cover is disposed on the top of the machine body, mounting shafts are fixedly connected to the left and right sides of the top of the machine body, mounting grooves are formed in the left and right sides of the bottom of the protective cover, an elastic layer is disposed outside the protective cover, and handles are fixedly connected to the left and right sides of the outside of the protective cover.
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