CN114059682B - Cement-based foam wave-absorbing material, wave-absorbing plate and preparation method of wave-absorbing plate - Google Patents
Cement-based foam wave-absorbing material, wave-absorbing plate and preparation method of wave-absorbing plate Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/32—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed at least two layers being foamed and next to each other
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2266/00—Composition of foam
- B32B2266/04—Inorganic
- B32B2266/049—Water-setting material, e.g. concrete, plaster or asbestos cement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
- B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00258—Electromagnetic wave absorbing or shielding materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B2001/925—Protection against harmful electro-magnetic or radio-active radiations, e.g. X-rays
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Abstract
The application discloses a cement-based foam wave-absorbing material, a wave-absorbing plate and a preparation method thereof. The wave-absorbing material has the advantages of low volume weight, adjustable density and double-layer structure, high wave-absorbing efficiency, large effective absorption bandwidth, low manufacturing cost, fire prevention, incombustibility and the like.
Description
Technical Field
The application relates to a cement-based foam wave-absorbing material, a wave-absorbing plate and a preparation method thereof.
Background
Electromagnetic radiation can have serious influence on human health, information transmission, precision instruments and equipment, and electromagnetic pollution is generally solved mainly through two means of electromagnetic shielding and electromagnetic absorption. Electromagnetic shielding can cause the reflection of electromagnetic waves to form secondary electromagnetic pollution, and electromagnetic absorption energy is used for remarkably reducing or completely eliminating electromagnetic radiation through energy conversion or destructive interference, so that the electromagnetic pollution is the most ideal means for solving the electromagnetic pollution. Commonly used electromagnetic absorbing materials are classified into filling type, structural type and composite type. In the aspect of the existing building wave-absorbing material, the wave-absorbing agent with high electromagnetic parameters is mainly doped into the compact inorganic cementing material, so that the wave-absorbing performance is enhanced, but the wave-absorbing material has good wave-absorbing performance only in specific frequency bands, and has the defects of relatively high cost, high density, single functionality and the like of the wave-absorbing agent. The ideal wave-absorbing material needs to have good impedance matching and large electromagnetic loss capability, the good impedance matching ensures that a large amount of electromagnetic wave can enter the material, and the high electromagnetic loss capability ensures that the electromagnetic wave transmitted into the substrate can be effectively lost and attenuated. However, good impedance matching results in reduced loss performance, which results in reduced wave-absorbing performance, and therefore, balancing the impedance matching and loss capability is required. The wave-absorbing material is formed into the matching layer and the loss layer through structural design and regulation, and impedance matching between the matching layer and the air and loss layer is regulated, so that the overall impedance matching performance of the wave-absorbing material is remarkably improved, and the wave-absorbing performance of the wave-absorbing material is enhanced by combining a good wave-absorbing agent.
The building wave-absorbing material not only requires the characteristics of light weight, strong absorption capacity and wide absorption range, but also has the characteristics of good heat stability, oxidation resistance, durability and the like.
CN201910164292.5 discloses a high-temperature resistant structure wave-absorbing material based on a metal coating and a preparation method thereof, the wave-absorbing material with a double-layer structure is composed of a quartz fiber reinforced silica aerogel composite material as a bottom layer, a silicon carbide fiber cloth coated with nickel-chromium-neodymium alloy as a surface layer, and the wave-absorbing performance of 12GHz can be achieved by the absorption bandwidth with the reflectivity smaller than-10 dB, but the preparation process is complex, and the durability and the compatibility of the metal material to the building material are poor.
CN201911154151.1 discloses a three-layer structure composed of a nano alumina hole as an enhanced scattering absorption layer, graphene as a high-efficiency absorption layer and a metal substrate as a strong reflection layer, so that high-efficiency absorption performance for visible light and near infrared bands is obtained, but the preparation process is complex and is not suitable for related fields such as radio communication.
CN201811000908.7 discloses a wave-absorbing composite board composed of a three-layer structure composed of a transmission layer, a loss layer and a reflection layer and a composite material composed of alkali-activated slag gel material and polystyrene particles, which has good wave-absorbing performance in 8-18GHz, but does not exhibit low-frequency wave-absorbing performance.
CN201811298027.8 and discloses a multilayer structure wave-absorbing material and a preparation method thereof, which combine different three-dimensional network architecture structures with the multilayer structure to obtain the multilayer structure wave-absorbing material with strong absorption, but the preparation process is complex, is not suitable for on-site preparation of the building wave-absorbing material, and has narrow absorption bandwidth.
Disclosure of Invention
Aiming at the problems of high density, narrow absorption bandwidth, high manufacturing cost and the like of the traditional building wave-absorbing material, the application provides a cement-based foam wave-absorbing material which has the advantages of wide frequency band, high absorption efficiency, low cost, fire prevention, incombustibility, good durability and the like.
The technical proposal is as follows: the wave absorbing material comprises a surface layer and a bottom layer, wherein the surface layer is an impedance matching layer, and the bottom layer is an absorbing layer.
Optionally, the surface layer porosity is 80% -85%, the bottom layer porosity is 45% -65%, and the surface layer porosity is > the bottom layer porosity.
Optionally, the thickness of the surface layer is 10-30mm, the density is 250-1000kg/m3, the thickness of the bottom layer is 0-25mm, the density is 250-1000kg/m3, the thickness of the bottom layer is >0, and the density of the surface layer is less than the density of the bottom layer.
The application also provides a preparation method of the cement-based foam wave-absorbing material.
The technical proposal is as follows: a preparation method of a cement-based foam wave-absorbing material comprises the following steps:
s1, preparing a bottom cement-based foam slurry, wherein the preparation steps are as follows:
s11, dispersing a water reducer for the multi-wall carbon nano tube in water to form a uniformly dispersed multi-wall carbon nano tube solution;
s12, adding polypropylene fibers, expanded glass beads and graphene into a cement material, and adding a foam stabilizer to form a mixture;
s13, mixing the mixture prepared in the S12, the multi-wall carbon nanotube solution prepared in the S11, an accelerator and hydrogen peroxide to obtain a bottom cement-based foam slurry;
in S1, 900-1100 parts of cement, 500-600 parts of water, 20-100 parts of hydrogen peroxide, 5-20 parts of aluminum sulfate liquid accelerator, 0-10 parts of stearic acid foam stabilizer, 0-10 parts of polycarboxylate water reducer, 0-5 parts of multi-wall carbon nano tube, 0-5 parts of polypropylene fiber, 2-10 parts of expanded glass bead and 2-5 parts of graphene;
s2, preparing the surface cement-based foam slurry, wherein the preparation steps are as follows:
s21, dispersing the water reducer for the multi-wall carbon nano tube in water to form a uniformly dispersed multi-wall carbon nano tube solution;
s22, adding polypropylene fibers, expanded glass beads and graphene into a cement material, and adding a foam stabilizer to form a mixture;
s23, mixing the mixture prepared in the step S22, the multi-wall carbon nanotube solution prepared in the step S21, an accelerator and hydrogen peroxide to obtain surface cement-based foam slurry;
in S2, 900-1100 parts of cement, 500-600 parts of water, 20-100 parts of hydrogen peroxide, 5-20 parts of aluminum sulfate liquid accelerator, 0-10 parts of stearic acid foam stabilizer, 0-10 parts of polycarboxylate water reducer, 0-5 parts of multi-wall carbon nano tube, 0-5 parts of polypropylene fiber, 2-10 parts of expanded glass bead and 2-5 parts of graphene;
and S3, foaming the bottom-layer cement-based foam slurry prepared in the step S1 and the surface-layer cement-based foam slurry prepared in the step S2 in a mold, naturally curing, carrying out standard curing, and drying to form the ordinary silicate cement-based foam wave-absorbing material consisting of the surface layer and the bottom layer.
Optionally, the step S13 specifically includes: placing the mixture prepared in the step S12 into a stirrer, adding the multi-wall carbon nano tube solution and the liquid accelerator in the step S11, and stirring at a low speed to obtain uniform slurry; adding hydrogen peroxide and stirring at high speed to obtain surface cement-based foam slurry; s23 specifically comprises the following steps: placing the mixture prepared in the step S22 into a stirrer, adding the multi-wall carbon nano tube solution and the liquid accelerator in the step S21, and stirring the mixture to uniform slurry at 1000-7000 rad/min; hydrogen peroxide is added and stirred at 15000-20000rad/min to obtain the surface cement-based foam slurry.
Optionally, the water is deionized water.
Optionally, in the S1, 950-1050 parts of cement, 500-550 parts of water, 20-80 parts of hydrogen peroxide, 5-18 parts of aluminum sulfate liquid accelerator, 1-8 parts of stearic acid foam stabilizer, 1-8 parts of polycarboxylate water reducer, 1-5 parts of multi-wall carbon nano tube, 2-5 parts of polypropylene fiber, 2-8 parts of expanded glass bead and 2-4 parts of graphene;
in the S2, 950-1050 parts of cement, 500-550 parts of water, 20-80 parts of hydrogen peroxide, 5-18 parts of aluminum sulfate liquid accelerator, 1-8 parts of stearic acid foam stabilizer, 1-8 parts of polycarboxylate water reducer, 1-5 parts of multi-wall carbon nano tube, 2-5 parts of polypropylene fiber, 2-8 parts of expanded glass bead and 2-4 parts of graphene.
Optionally, the multi-walled carbon nanotubes have a length of 5-15 μm.
Optionally, the accelerator is aluminum sulfate liquid accelerator, the foam stabilizer is stearic acid foam stabilizer, and the water reducer is polycarboxylate water reducer.
The application also provides a wave absorbing plate.
A wave-absorbing sheet comprising the wave-absorbing material described above.
The invention has the following processes, principles and beneficial effects:
on one hand, the raw materials adopted by the inventor of the application are cement, multi-wall carbon nano-tubes, hydrogen peroxide and the like, and the manufacturing cost is low; on the other hand, the inventor of the application forms the cement-based foam wave absorbing material with the maximum effective bandwidth of 14GHz and the minimum reflectivity of-47.30 dB, wherein the effective bandwidth is lower than-10 dB in the range of 2-18GHz by combining the wave absorbing agent with good electromagnetic parameters, and the cement-based foam wave absorbing material has the advantages that the surface layer is an impedance matching layer, the bottom layer is an absorbing layer, and the pore structure is adjusted to improve the impedance matching characteristic of the material.
Drawings
FIG. 1 is a microscopic view of a sample of foamed cement-based construction wave absorbing material of examples 1-3 of the present application;
FIG. 2 is a graph of reflection loss of foamed cement-based wave absorbing materials of examples 1-5 of the present application;
FIG. 3 is a microscopic view of a sample of foamed cement-based construction wave absorbing material of examples 4-5 of the present application.
Detailed Description
The present application will be further described with reference to the accompanying drawings.
In the present invention, the term "parts by weight" means in terms of weight, and for example, 1 part by weight means: when the weight is Kg, 1 part by weight means 1Kg; when the weight is g, 1 part by weight means 1g, and so on, not limited to a specific Kg or g.
The preparation method of the ordinary Portland cement-based foam wave-absorbing material comprises the following steps:
s1, preparing a bottom cement-based foam slurry, wherein the preparation steps are as follows:
(1) Dispersing the water reducer for the multi-wall carbon nano tube in water to form a uniformly dispersed multi-wall carbon nano tube solution.
(2) And adding the polypropylene fiber, the expanded glass beads and the graphene into the cement material, and adding the foam stabilizer to uniformly mix to obtain a mixture.
(3) Placing the mixture prepared in the step (2) into a stirrer, adding the multi-wall carbon nano tube solution and the accelerator in the step (1), and stirring at a low speed (1000-7000 rad/min) to obtain uniform slurry; hydrogen peroxide is added and stirred at high speed (15000-20000 rad/min) to obtain the bottom cement-based foam slurry.
In the preparation of the bottom cement-based foam slurry, 900-1100 parts of cement, 500-600 parts of deionized water, 20-100 parts of hydrogen peroxide, 5-20 parts of aluminum sulfate liquid accelerator, 0-10 parts of stearic acid foam stabilizer, 0-10 parts of polycarboxylate water reducer, 0-5 parts of multi-wall carbon nano tube, 0-5 parts of polypropylene fiber, 2-10 parts of expanded glass bead and 2-5 parts of graphene.
S2, preparing the surface cement-based foam slurry, wherein the preparation steps are as follows:
(1) Dispersing the water reducer for the multi-wall carbon nano tube in water to form a uniformly dispersed multi-wall carbon nano tube solution.
(2) And adding the polypropylene fiber, the expanded glass beads and the graphene into the cement material, and adding the foam stabilizer to uniformly mix to obtain a mixture.
(3) Placing the mixture prepared in the step (2) into a stirrer, adding the multi-wall carbon nanotube solution and the liquid accelerator in the step (1), and stirring at a low speed (1000-7000 rad/min) to obtain uniform slurry; hydrogen peroxide was added and stirred at high speed (15000-20000 rad/min) for 10 seconds to obtain a surface cement-based foam slurry.
In the preparation of the surface cement-based foam slurry, 900-1100 parts of cement, 500-600 parts of deionized water, 20-100 parts of hydrogen peroxide, 5-20 parts of aluminum sulfate liquid accelerator, 0-10 parts of stearic acid foam stabilizer, 0-10 parts of polycarboxylate water reducer, 0-5 parts of multi-wall carbon nano tube, 0-5 parts of polypropylene fiber, 2-10 parts of expanded glass bead and 2-5 parts of graphene.
S3, foaming the bottom cement-based foam slurry prepared in the step S1 and the surface cement-based foam slurry prepared in the step S2 in a mold, naturally curing, carrying out standard curing, and drying to form the ordinary silicate cement-based foam wave absorbing material, wherein the thickness of the surface layer is 10-30mm, the density is 250-1000kg/m < 3 >, the thickness of the bottom layer is 0-25mm, and the density is 250-1000kg/m < 3 >.
Based on the preparation method of the ordinary Portland cement-based foam wave-absorbing material, the application also provides the ordinary Portland cement-based foam wave-absorbing material.
The ordinary Portland cement-based foam wave-absorbing material consists of a surface layer and a bottom layer, and is prepared by the preparation method of the ordinary Portland cement-based foam wave-absorbing material, wherein the surface layer of the ordinary Portland cement-based foam wave-absorbing material is an impedance matching layer, and the bottom layer of the ordinary Portland cement-based foam wave-absorbing material is an absorbing layer.
The porosity of the surface layer is 80-85%, the porosity of the bottom layer is 45-65%, the porosity of the surface layer is greater than the porosity of the bottom layer, the effective bandwidth with the electromagnetic wave reflectivity lower than-10 dB in the range of 2-18GHz can reach 14GHz at the widest, and the minimum reflectivity can reach-47.30 dB.
The thickness of the surface layer is 10-30mm, the density is 250-1000kg/m3, the thickness of the bottom layer is 0-25mm, the density is 250-1000kg/m3, the thickness of the bottom layer is more than 0, and the density of the surface layer is less than the density of the bottom layer.
Based on the ordinary Portland cement-based foam wave-absorbing material, the application also provides a wave-absorbing plate.
A wave absorbing sheet comprising the above portland cement-based foam wave absorbing material.
Example 1:
in this embodiment, the weight portions of the raw materials are as follows: 1000 parts of cement, 550 parts of deionized water, 50 parts of hydrogen peroxide, 6 parts of aluminum sulfate liquid accelerator, 6 parts of stearic acid foam stabilizer, 2.5 parts of polycarboxylate water reducer, 3 parts of multi-wall carbon nano tube, 5 parts of expanded glass bead, 2 parts of graphene and 2 parts of polypropylene fiber.
The method comprises the following specific steps:
(1) And dispersing the polycarboxylic acid water reducer for the multi-wall carbon nano tube in deionized water to form a uniformly dispersed multi-wall carbon nano tube solution.
(2) And adding the polypropylene fiber, the expanded glass beads and the graphene into a cement material, and adding a stearic acid foam stabilizer to uniformly mix to obtain a mixture.
(3) Placing the mixture prepared in the step (2) in a stirrer, adding the multi-wall carbon nanotube solution prepared in the step (1) and an aluminum sulfate liquid accelerator, and stirring at a low speed (1000-7000 rad/min) to obtain uniform slurry; weighing, adding hydrogen peroxide and stirring at high speed (15000-20000 rad/min) for 10 seconds to obtain cement-based foam slurry.
(4) Pouring the cement-based foam slurry prepared in the step (3) into a 180mm multiplied by 50mm mold, standing and foaming for 30 minutes, and then naturally curing for 24 hours, and hardening and demolding. Standard curing is carried out for 28 days.
(5) After reaching the age, the sample is cut into standard test samples of 180mm multiplied by 20mm, and the standard test samples are dried to constant weight by an explosion-proof drying oven at 60 ℃ to obtain the dried standard test samples.
And (3) detecting the density and porosity of the dried standard test sample prepared in the step (5), wherein the density is 650kg/m3, the porosity is 17%, and the thickness is 20mm.
The microscopic image of the dried standard test specimen is shown in fig. 1.
The oven dried standard test specimens were tested using the bow method and the results are shown in fig. 2 for wave absorbing performance in the 2-18GHz range: the optimum reflectivity value is-13.59 dB, and the effective frequency bandwidth with the reflectivity less than-10 dB is 9.76GHz.
Example 2:
in this embodiment, the weight portions of the raw materials are as follows: 1000 parts of cement, 550 parts of deionized water, 48 parts of hydrogen peroxide, 3 parts of aluminum sulfate liquid accelerator, 6 parts of stearic acid foam stabilizer, 2 parts of polycarboxylate water reducer, 3 parts of multi-wall carbon nano tube, 5 parts of expanded glass bead, 2 parts of graphene and 0 part of polypropylene fiber.
The method comprises the following specific steps:
(1) And dispersing the polycarboxylic acid water reducer for the multi-wall carbon nano tube in deionized water to form a uniformly dispersed multi-wall carbon nano tube solution.
(2) And adding the polypropylene fiber, the expanded glass beads and the graphene into cement, and adding a stearic acid foam stabilizer for uniformly mixing to obtain a mixture.
(3) Placing the mixture prepared in the step (2) in a stirrer, adding the multi-wall carbon nanotube solution prepared in the step (1) and an aluminum sulfate liquid accelerator, and stirring at a low speed (1000-7000 rad/min) to obtain uniform slurry; hydrogen peroxide was added and stirred at high speed (15000-20000 rad/min) for 10 seconds to obtain a cement-based foam slurry.
(4) Pouring the cement-based foam slurry prepared in the step (3) into a 180mm multiplied by 50mm mold, standing and foaming for 30 minutes, and then naturally curing for 24 hours, and hardening and demolding. Standard curing is carried out for 28 days.
(5) After reaching the age, the sample is cut into standard test samples of 180mm multiplied by 20mm, and the standard test samples are dried to constant weight by an explosion-proof drying oven at 60 ℃ to obtain the dried standard test samples.
And (3) detecting the density and porosity of the dried standard test sample prepared in the step (5), wherein the density is 750kg/m3, the porosity is 57%, and the thickness is 20mm.
The microscopic image of the dried standard test specimen is shown in fig. 1.
The oven dried standard test specimens were tested using the bow method and the results are shown in fig. 2 for wave absorbing performance in the 2-18GHz range: the optimum reflectivity value is-25.90 dB, and the effective frequency bandwidth with the reflectivity less than-10 dB is 5.44GHz.
Example 3:
in this embodiment, the weight portions of the raw materials are as follows: 1000 parts of cement, 550 parts of deionized water, 38 parts of hydrogen peroxide, 5 parts of aluminum sulfate liquid accelerator, 6 parts of stearic acid foam stabilizer, 2.5 parts of polycarboxylate water reducer, 2.4 parts of multi-wall carbon nano tube, 10 parts of expanded glass bead, 5 parts of graphene and 2 parts of polypropylene fiber.
The method comprises the following specific steps:
(1) And dispersing the polycarboxylic acid water reducer for the multi-wall carbon nano tube in deionized water to form a uniformly dispersed multi-wall carbon nano tube solution.
(2) And adding the polypropylene fiber, the expanded glass beads and the graphene into a cement material, and adding a stearic acid foam stabilizer to uniformly mix to obtain a mixture.
(3) Placing the mixture prepared in the step (2) in a stirrer, adding the multi-wall carbon nanotube solution prepared in the step (1) and an aluminum sulfate liquid accelerator, and stirring at a low speed (1000-7000 rad/min) to obtain uniform slurry; hydrogen peroxide was added and stirred at high speed (15000-20000 rad/min) for 10 seconds to obtain a cement-based foam slurry.
(4) Pouring the cement-based foam slurry prepared in the step (3) into a 180mm multiplied by 50mm mold, standing and foaming for 30 minutes, and then naturally curing for 24 hours, and hardening and demolding. Standard curing is carried out for 28 days.
(5) After reaching the age, the sample is cut into standard test samples of 180mm multiplied by 20mm, and the standard test samples are dried to constant weight by an explosion-proof drying oven at 60 ℃ to obtain the dried standard test samples.
And (3) detecting the density and porosity of the dried standard test sample prepared in the step (5), wherein the density is 900kg/m3, the porosity is 48%, and the thickness is 20mm.
The microscopic image of the dried standard test specimen is shown in fig. 1.
Standard test sample density after oven-drying was tested using the bow method, and the results are shown in FIG. 2, for wave absorbing performance in the range of 2-18 GHz: the best reflectivity value is-20.62 dB, and the effective frequency bandwidth with the reflectivity less than-10 dB is 3.76GHz.
Example 4:
in this embodiment, the weight portions of the raw materials are as follows:
a surface layer: 1000 parts of cement, 550 parts of deionized water, 80 parts of hydrogen peroxide, 12 parts of aluminum sulfate liquid accelerator, 2 parts of stearic acid foam stabilizer, 1 part of polycarboxylate water reducer, 0 part of multi-wall carbon nano tube, 10 parts of expanded glass beads, 2 parts of graphene and 2 parts of polypropylene fiber.
The bottom layer: 1000 parts of cement, 550 parts of deionized water, 38 parts of hydrogen peroxide, 5 parts of aluminum sulfate liquid accelerator, 6 parts of stearic acid foam stabilizer, 2.5 parts of polycarboxylate water reducer, 2.4 parts of multi-walled carbon nanotube, 5 parts of expanded glass bead, 2 parts of graphene and 0 part of polypropylene fiber.
The method comprises the following specific steps:
s1, preparing a bottom cement-based foam slurry, wherein the preparation steps are as follows:
(1) And dispersing the polycarboxylic acid water reducer for the multi-wall carbon nano tube in deionized water to form a uniformly dispersed multi-wall carbon nano tube solution.
(2) And adding the polypropylene fiber, the expanded glass beads and the graphene into a cement material, and adding a stearic acid foam stabilizer to uniformly mix to obtain a mixture.
(3) Placing the mixture prepared in the step (2) into a stirrer, adding the multi-wall carbon nano tube solution and the aluminum sulfate liquid accelerator in the step (1), and stirring at a low speed (1000-7000 rad/min) to obtain uniform slurry; hydrogen peroxide was added and stirred at high speed (15000-20000 rad/min) for 10 seconds to obtain a bottom cement-based foam slurry.
S2, preparing the surface cement-based foam slurry, wherein the preparation steps are as follows:
(1) And dispersing the polycarboxylate water reducer in deionized water to form a water reducer solution with uniform dispersion.
(2) And adding the polypropylene fiber, the expanded glass beads and the graphene into a cement material, and adding a stearic acid foam stabilizer to uniformly mix to obtain a mixture.
(3) Placing the mixture prepared in the step (2) into a stirrer, adding the water reducing agent solution and the aluminum sulfate liquid accelerator in the step (1), and stirring at a low speed (1000-7000 rad/min) to obtain uniform slurry; hydrogen peroxide was added and stirred at high speed (15000-20000 rad/min) for 10 seconds to obtain a surface cement-based foam slurry.
S3, pouring the cement-based foam slurry prepared in the step S1 into a 180mm multiplied by 50mm mold, standing and foaming for 30 minutes, naturally curing for 24 hours, hardening and demolding, and cutting the obtained sample into standard test samples of 180mm multiplied by 15 mm.
S4, placing the standard test sample of 180mm multiplied by 15mm prepared in the S3 at the bottom of a mould of 180mm multiplied by 50mm, pouring the surface cement-based foam slurry prepared in the S2 on the standard test sample of 180mm multiplied by 15mm, standing and foaming for 30 minutes, and then naturally curing for 24 hours to harden and demold the mould.
S5, cutting the sample after S4 hardening and demolding into 180mm multiplied by 20mm, wherein the thickness of the surface layer is 5mm, carrying out standard maintenance for 28 days, and drying the sample to constant weight by using an explosion-proof drying oven at 60 ℃ after reaching the age, thus obtaining the dried standard test sample.
The density and porosity were measured on dried standard test specimens, wherein the skin layer density was 350kg/m3, the porosity was 81%, and the skin layer thickness was 5mm. The density of the bottom layer is 900kg/m3, the porosity is 48% and the thickness is 20mm.
The microscopic image of the dried standard test specimen is shown in fig. 3.
The oven dried standard test specimens were tested using the bow method and the results are shown in fig. 2 for wave absorbing performance in the 2-18GHz range: the optimum reflectivity value is-32.90 dB, and the effective frequency bandwidth with the reflectivity smaller than-10 dB is 12.70GHz.
Example 5:
a surface layer: 1000 parts of cement, 550 parts of deionized water, 80 parts of hydrogen peroxide, 12 parts of aluminum sulfate liquid accelerator, 2 parts of stearic acid foam stabilizer, 1 part of polycarboxylate water reducer, 0 part of multi-wall carbon nano tube, 10 parts of expanded glass beads, 2 parts of graphene and 2 parts of polypropylene fiber.
The bottom layer: 1000 parts of cement, 550 parts of deionized water, 38 parts of hydrogen peroxide, 5 parts of aluminum sulfate liquid accelerator, 6 parts of stearic acid foam stabilizer, 2.5 parts of polycarboxylate water reducer, 2.4 parts of multi-walled carbon nanotube, 5 parts of expanded glass bead, 2 parts of graphene and 0 part of polypropylene fiber.
The method comprises the following specific steps:
s1, preparing a bottom cement-based foam slurry, wherein the preparation steps are as follows:
(1) And dispersing the polycarboxylic acid water reducer for the multi-wall carbon nano tube in deionized water to form a uniformly dispersed multi-wall carbon nano tube solution.
(2) And adding the polypropylene fiber, the expanded glass beads and the graphene into a cement material, and adding a stearic acid foam stabilizer to uniformly mix to obtain a mixture.
(3) Placing the mixture prepared in the step (2) into a stirrer, adding the multi-wall carbon nano tube solution and the aluminum sulfate liquid accelerator in the step (1), and stirring at a low speed (1000-7000 rad/min) to obtain uniform slurry; hydrogen peroxide was added and stirred at high speed (15000-20000 rad/min) for 10 seconds to obtain a bottom cement-based foam slurry.
S2, preparing the surface cement-based foam slurry, wherein the preparation steps are as follows:
(1) And dispersing the polycarboxylate water reducer in deionized water to form a water reducer solution with uniform dispersion.
(2) And adding the polypropylene fiber, the expanded glass beads and the graphene into a cement material, and adding a stearic acid foam stabilizer to uniformly mix to obtain a mixture.
(3) Placing the mixture prepared in the step (2) into a stirrer, adding the water reducing agent solution and the aluminum sulfate liquid accelerator in the step (1), and stirring at a low speed (1000-7000 rad/min) to obtain uniform slurry; hydrogen peroxide was added and stirred at high speed (15000-20000 rad/min) for 10 seconds to obtain a surface cement-based foam slurry.
S3, pouring the cement-based foam slurry prepared in the step S1 into a 180mm multiplied by 50mm mold, standing and foaming for 30 minutes, naturally curing for 24 hours, hardening and demolding, and cutting the obtained sample into standard test samples of 180mm multiplied by 25mm.
S4, placing the 180mm multiplied by 25mm standard test sample prepared in the S3 into the bottom of a 180mm multiplied by 50mm mould, pouring the surface cement-based foam slurry prepared in the S2 on the 180mm multiplied by 25mm standard test sample, standing and foaming for 30 minutes, and then naturally curing for 24 hours to harden and demold the mould.
S5, cutting the sample after S4 hardening and demolding into 180mm multiplied by 30mm, wherein the thickness of the surface layer is 5mm, carrying out standard maintenance for 28 days, and drying the sample to constant weight by using an explosion-proof drying oven at 60 ℃ after reaching the age, thus obtaining the dried standard test sample.
The density and porosity were measured on dried standard test specimens, wherein the surface layer density was 350kg/m3, the porosity was 81% and the thickness was 5mm. The density of the bottom layer is 900kg/m3, the porosity is 48% and the thickness is 25mm.
The microscopic image of the dried standard test specimen is shown in fig. 3.
The oven dried standard test specimens were tested using the bow method and the results are shown in fig. 2 for wave absorbing performance in the 2-18GHz range: the optimum reflectivity value is-47.30 dB, and the effective frequency bandwidth with the reflectivity less than-10 dB is 14.00GHz.
In this application, unless otherwise indicated, they are all prior art.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (7)
1. The preparation method of the cement-based foam wave-absorbing material comprises a surface layer and a bottom layer, wherein the surface layer is an impedance matching layer, and the bottom layer is an absorption layer, and is characterized by comprising the following steps:
s1: the preparation steps of the bottom cement-based foam slurry are as follows:
s11, dispersing a water reducer for the multi-wall carbon nano tube in water to form a uniformly dispersed multi-wall carbon nano tube solution;
s12, adding polypropylene fibers, expanded glass beads and graphene into a cement material, and adding a foam stabilizer to form a mixture;
s13, mixing the mixture prepared in the S12, the multi-wall carbon nanotube solution prepared in the S11, an accelerator and hydrogen peroxide to obtain a bottom cement-based foam slurry;
in S1, 900-1100 parts of cement, 500-550 parts of water, 38 parts of hydrogen peroxide, 5-12 parts of aluminum sulfate liquid accelerator, 2-6 parts of stearic acid foam stabilizer, 0-2.5 parts of polycarboxylate water reducer, 2.4 parts of multi-wall carbon nano tube, 0-2 parts of polypropylene fiber, 5-10 parts of expanded glass bead and 2-5 parts of graphene;
s2: the preparation method of the surface cement-based foam slurry comprises the following steps:
s21, dispersing the water reducer for the multi-wall carbon nano tube in water to form a uniformly dispersed multi-wall carbon nano tube solution;
s22, adding polypropylene fibers, expanded glass beads and graphene into a cement material, and adding a foam stabilizer to form a mixture;
s23, mixing the mixture prepared in the step S22, the multi-wall carbon nanotube solution prepared in the step S21, an accelerator and hydrogen peroxide to obtain surface cement-based foam slurry;
in S2, 900-1100 parts of cement, 500-550 parts of water, 80 parts of hydrogen peroxide, 5-12 parts of aluminum sulfate liquid accelerator, 2-6 parts of stearic acid foam stabilizer, 0-2.5 parts of polycarboxylate water reducer, 0 parts of multi-wall carbon nano tube, 0-2 parts of polypropylene fiber, 5-10 parts of expanded glass bead and 2-5 parts of graphene;
and S3, foaming the bottom-layer cement-based foam slurry prepared in the step S1 and the surface-layer cement-based foam slurry prepared in the step S2 in a mold, naturally curing, carrying out standard curing, and drying to form the ordinary silicate cement-based foam wave-absorbing material consisting of the surface layer and the bottom layer.
2. The method for preparing a cement-based foam wave absorbing material according to claim 1, wherein the step S13 is specifically: placing the mixture prepared in the step S12 into a stirrer, adding the multi-wall carbon nano tube solution and the liquid accelerator in the step S11, and stirring at a low speed to obtain uniform slurry; adding hydrogen peroxide and stirring at high speed to obtain surface cement-based foam slurry; s23 specifically comprises the following steps: placing the mixture prepared in the step S22 into a stirrer, adding the multi-wall carbon nano tube solution and the liquid accelerator in the step S21, and stirring the mixture to uniform slurry at 1000-7000 rad/min; hydrogen peroxide is added and stirred at 15000-20000rad/min to obtain the surface cement-based foam slurry.
3. The method for preparing a cement-based foam wave absorbing material according to claim 1, wherein the water is deionized water; or/and (or)
The length of the multi-wall carbon nano tube is 5-15 mu m.
4. A method for preparing a cement-based foam wave absorbing material according to any one of claims 1 to 3, wherein the accelerator is an aluminum sulfate liquid accelerator, the foam stabilizer is a stearic acid foam stabilizer, and the water reducing agent is a polycarboxylate water reducing agent.
5. A wave-absorbing material, characterized in that the wave-absorbing material is produced by the method for producing a cement-based foam wave-absorbing material according to any one of claims 1 to 4, the wave-absorbing material comprising a surface layer and a bottom layer, wherein the surface layer is an impedance matching layer, the bottom layer is an absorbing layer, the surface layer has a porosity of 81%, the surface layer has a thickness of 10 to 30mm, and the density is 350kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The porosity of the bottom layer is 48%, the thickness of the bottom layer is 0-25mm, and the density is 900kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Thickness of bottom layer>0, surface Density<Bottom layer density.
6. A wave absorbing material according to claim 5, wherein the wave absorbing material has an effective bandwidth of up to 14GHz at a maximum and up to-47.30 dB at a minimum, with an electromagnetic wave reflectivity in the range of 2-18GHz below-10 dB.
7. A wave absorbing sheet, characterized in that the wave absorbing sheet comprises a wave absorbing material according to any one of claims 5-6.
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