CN115557741B - Preparation method of cement-based wave-absorbing material with adjustable wave-absorbing performance - Google Patents
Preparation method of cement-based wave-absorbing material with adjustable wave-absorbing performance Download PDFInfo
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- CN115557741B CN115557741B CN202211418504.6A CN202211418504A CN115557741B CN 115557741 B CN115557741 B CN 115557741B CN 202211418504 A CN202211418504 A CN 202211418504A CN 115557741 B CN115557741 B CN 115557741B
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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
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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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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Hard Magnetic Materials (AREA)
Abstract
The invention discloses a preparation method of a cement-based wave-absorbing material with adjustable wave-absorbing performance, which comprises the following steps ofThe fluid is encapsulated in the hollow wave-transparent ball to form a magnetic fluid capsule which is uniformly dispersed in the cement matrix. Fe in the wave-transparent ball can be changed by means of an externally applied magnetic field 3 O 4 The existence form of the magnetic fluid changes the electromagnetic parameters inside the cement-based wave absorbing material, and finally the purpose of regulating and controlling the wave absorbing performance of the cement-based material is achieved. The invention can overcome the defect that the wave absorbing performance of the traditional cement-based wave absorbing material cannot be changed once formed, and further widens the application field and range of the cement-based wave absorbing material. The preparation method is simple and practical, the wave absorbing performance of the cement-based wave absorbing material can be flexibly regulated and controlled to a large extent, and the wave absorbing performance of the wave absorbing material can be restored before loading after an external magnetic field is removed.
Description
Technical Field
The invention belongs to the field of wave-absorbing functional materials, and particularly relates to a preparation method of a cement-based wave-absorbing material with adjustable wave-absorbing performance.
Background
The electromagnetic protection function of the building is realized, and the electromagnetic protection device has important functions of reducing radiation, leakage and interference caused by electromagnetic waves, and particularly avoiding electromagnetic detection. Cement is one of the most widely used building materials, and cement-based electromagnetic wave absorbing materials developed from the cement-based electromagnetic wave absorbing materials integrate bearing capacity and wave absorbing function, and are regarded as ideal candidate materials for solving electromagnetic radiation in building space and radar detection in important engineering.
With the development of modern electromagnetic detection technologies such as radars, engineering concealment and protection are more and more difficult. Therefore, the demand for the wave-absorbing material is also increasing. After the traditional cement-based wave-absorbing material is prepared and molded, the wave-absorbing performance of the material is fixed, and when the external electromagnetic environment changes, the wave-absorbing performance of the material cannot be changed to adapt to the change of the electromagnetic environment, so that the electromagnetic camouflage purpose is difficult to achieve. Only the cement-based wave-absorbing material with adjustable wave-absorbing performance can meet the actual requirements.
CN 202110440486.0 double-layer cement-based wave-absorbing material with adjustable wave-absorbing performance and application method thereof, and Fe is pre-embedded 3 O 4 The wave absorbing performance of the cement-based wave absorbing material can be regulated and controlled by the magnetic fluid wave-transmitting tube. However, because the wave-transmitting tube is longer, the magnetic fluid is difficult to recover to the level before loading when the magnetic field is externally applied, so that the wave-absorbing performance is difficult to recover to the level before loading; the maximum adjusting and controlling range of the wave-absorbing intensity (reflectivity) is 3.7GHz, and the adjusting and controlling range is limited.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a preparation method of a cement-based wave absorbing material with adjustable wave absorbing performance. The cement-based wave-absorbing material with adjustable wave-absorbing performance can overcome the defect that the traditional cement-based wave-absorbing material cannot be changed once being molded, and further widens the application field and range of the cement-based wave-absorbing material. The preparation method is simple and practical, the wave absorbing performance of the cement-based wave absorbing material can be flexibly regulated and controlled to a large extent, and the wave absorbing performance of the wave absorbing material can be restored before loading after an external magnetic field is removed.
In order to achieve the above object, the present invention is realized by the following technical solutions:
the invention relates to a preparation method of a cement-based wave-absorbing material with adjustable wave-absorbing performance, which comprises the steps of mixing Fe with a catalyst 3 O 4 The magnetic fluid is encapsulated into a hollow wave-transparent ball to form a magnetic fluid capsule, and then the magnetic fluid capsule is uniformly dispersed in a cement matrix in a physical doping way; the method specifically comprises the following steps:
step 1: nano Fe 3 O 4 Injecting magnetic fluid into the hollow wave-transparent ball, and sealing with resin after filling to obtain Fe 3 O 4 The magnetofluid capsule is reserved;
step 2: mixing cement and water, stirring uniformly, and adding Fe 3 O 4 Magnetic fluid capsules, stirring uniformly;
step 3: pouring, demolding and curing the newly mixed slurry of the wave-absorbing material obtained in the step 2 to obtain the cement-based wave-absorbing material with adjustable wave-absorbing performance.
Further, the nano Fe 3 O 4 The viscosity of the magnetic fluid is 5-17 mPa.s, wherein Fe 3 O 4 The mass fraction of (2) is 7-35%.
Further, the hollow wave-transparent ball is one of a glass fiber hollow ball, an organic glass hollow ball (PMMA), a polyethylene hollow ball (PE), a polyurethane hollow ball (PUR), a nylon hollow ball (PA), an ABS plastic hollow ball, a polyvinyl chloride hollow ball (PVC) and a polyvinyl chloride hollow ball (PP-R); the diameter of the hollow sphere is 4-7 mm.
Further, the Fe 3 O 4 The volume filling rate of the magnetic fluid capsule in the cement-based material is 40% -65%.
The method for regulating and controlling the wave absorbing performance of the cement-based wave absorbing material comprises the following steps:
the mode of applying a magnetic field on the outer side of the wave-absorbing material is adopted to change the existence form of nano ferroferric oxide in the magnetic fluid capsule, so that the electromagnetic parameters of the wave-absorbing material are regulated and controlled, and further the wave-absorbing frequency band, the wave-absorbing frequency width and the wave-absorbing intensity are regulated and controlled.
Further, the magnetic field strength is 1500-10000 Gs.
According to the invention, the wave absorbing agent can be added into the cement matrix according to the wave absorbing performance requirements of engineering on the wave absorbing material, so that the cement-based wave absorbing material with adjustable wave absorbing performance and different wave absorbing effects can be obtained.
It should be understood that those skilled in the art can also obtain the cement-based wave absorbing material with adjustable wave absorbing performance according to the invention with different performances by adjusting the doping amount of the magnetic fluid capsule.
The beneficial technical effects of the invention are as follows:
1. according to the invention, the existence form of nano ferroferric oxide in the magnetic fluid capsule is changed by the action of an externally applied magnetic field, so that the electromagnetic performance of the cement-based material is changed, the purpose of regulating and controlling the wave absorbing performance of the cement-based material is realized, the defect that the wave absorbing performance of the traditional wave absorbing material is fixed is overcome, and the intelligent development of the cement-based wave absorbing material is promoted.
2. The invention has sensitive response to externally applied magnetic field, flexible regulation and control and larger regulation and control amplitude. After the external magnetic field is removed, the wave absorbing performance of the cement-based wave absorbing material can be restored to the state before loading.
3. The magnetic fluid capsule can be easily and uniformly distributed in cement-based materials, and has simple preparation process and lower manufacturing cost.
Drawings
FIG. 1 is a schematic diagram of a cement-based wave absorbing material with adjustable wave absorbing performance before loading a magnetic field according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a cement-based wave absorbing material with adjustable wave absorbing performance according to an embodiment of the present invention after loading a magnetic field;
FIG. 3 shows the results of the wave-absorbing performance test of the cement-based wave-absorbing material with adjustable wave-absorbing performance in example 1 before loading the magnetic field, after loading the magnetic field, and after removing the magnetic field.
FIG. 4 shows the results of the wave-absorbing performance test of the cement-based wave-absorbing material with adjustable wave-absorbing performance in example 2 before loading the magnetic field, after loading the magnetic field, and after removing the magnetic field.
FIG. 5 shows the results of the wave-absorbing performance test of the cement-based wave-absorbing material with adjustable wave-absorbing performance in example 3 before loading the magnetic field, after loading the magnetic field, and after removing the magnetic field.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to understand the invention better.
The terms used in the present invention generally have meanings commonly understood by those of ordinary skill in the art unless otherwise indicated. In the following examples, various processes and methods, which are not described in detail, are conventional methods well known in the art.
Examples:
examples 1-3:
the embodiment adopts cement-based materials, organic glass hollow spheres and nano Fe 3 O 4 The magnetic fluid is used as a main raw material, and the specific preparation method comprises the following steps:
1. nano Fe 3 O 4 The magnetic fluid is filled in the organic glass hollow sphere and then sealed by resin to prepare Fe 3 O 4 The magnetofluid capsule is ready for use.
2. Fe is added to 3 O 4 The magnetic fluid capsule is added into cement paste with the water-cement ratio of 0.45, fe 3 O 4 The volume doping amount of the magnetic fluid capsules is 40% of that of the example 1, 50% of that of the example 2 and 65% of that of the example 3 respectively.
3. Pouring the freshly mixed slurry of the wave-absorbing material into a mould with the thickness of 180mm multiplied by 20 mm; curing for 24 hours at 20+/-2 ℃ and the relative humidity is more than 95 percent, and then demoulding; and (3) placing the test block into a standard curing box for curing for 28 days to prepare the cement-based wave-absorbing material with adjustable wave-absorbing performance.
The prepared cement-based wave-absorbing material with adjustable wave-absorbing performance is dried in a 60 ℃ oven for 24 hours, and the wave-absorbing performance is tested by an arch method, wherein the test frequency range is 2-18 GHz. A schematic diagram of the wave-absorbing material is shown in FIG. 1.
The cement-based wave-absorbing material subjected to the wave-absorbing performance test is laterally loaded with an externally applied magnetic field with the magnetic field strength of 8000Gs, and then tested by an arch method, wherein the test frequency range is 2-18 GHz. A schematic diagram of the wave-absorbing material is shown in FIG. 2.
The cement-based wave-absorbing material loaded with the external magnetic field is tested by an arch method after the external magnetic field is removed for 2 hours, and the testing frequency range is 2-18 GHz.
Example 1 wave-absorbing materials the wave-absorbing properties of the wave-absorbing materials tested by the bow method before loading the magnetic field, after loading the magnetic field and after removing the magnetic field are shown in fig. 3; example 2 wave-absorbing materials the wave-absorbing properties of the wave-absorbing materials tested by the bow method before loading the magnetic field, after loading the magnetic field and after removing the magnetic field are shown in fig. 4; example 3 the wave-absorbing properties of the wave-absorbing material before loading the magnetic field, after loading the magnetic field and after removing the magnetic field, as measured by the bow method, are shown in fig. 5.
The wave-absorbing material prepared by the invention realizes the purposes of adjustable wave-absorbing frequency range, wide wave-absorbing frequency range and adjustable wave-absorbing intensity in the frequency range of 2-18 GHz. Wherein, the regulation and control range of the wave-absorbing strength (reflectivity) of the embodiment 2 before and after the loading magnetic field is as high as 9.8dB at 8.55 GHz; and the wave absorption frequency is lower than-10 dB, and the wave absorption frequency is regulated from 0.8GHz before loading to 8.3GHz after loading. Therefore, the wave-absorbing material prepared by the invention has a large regulation and control range.
The wave absorbing material prepared by the invention can almost recover the wave absorbing performance before loading the magnetic field after removing the magnetic field. Wherein, the maximum change of the wave-absorbing intensity (reflectivity) before loading the magnetic field and after removing the magnetic field in the embodiment 2 is only 1.1dB at 2GHz, and the change is small; and the wave-absorbing frequency is lower than-10 dB, the change is only 0.1GHz before the magnetic field is loaded and after the magnetic field is removed, and the change is small.
The wave-absorbing material prepared by the invention can achieve the purpose of adjustable wave-absorbing performance when the intensity of the loaded magnetic field is 8000Gs, and has lower intensity of the external magnetic field required to be adjusted and controlled and flexible adjustment and control. The above examples are preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (3)
1. A preparation method of a cement-based wave-absorbing material with adjustable wave-absorbing performance is characterized by comprising the following steps:
fe is added to 3 O 4 The magnetic fluid is encapsulated into a hollow wave-transparent ball to form a magnetic fluid capsule, and then the magnetic fluid capsule is uniformly dispersed in a cement matrix in a physical doping way; the method specifically comprises the following steps:
step 1: nano Fe 3 O 4 Injecting magnetic fluid into the hollow wave-transparent ball, and sealing with resin after filling to obtain Fe 3 O 4 The magnetofluid capsule is reserved;
step 2: mixing cement and water, stirring uniformly, and adding Fe 3 O 4 Magnetic fluid capsules, stirring uniformly;
step 3: pouring, demolding and curing the newly mixed slurry of the wave-absorbing material obtained in the step 2 to obtain the cement-based wave-absorbing material with adjustable wave-absorbing performance;
the nanometer Fe 3 O 4 The viscosity of the magnetic fluid is 5-17 mPa.s, wherein Fe 3 O 4 The mass fraction of (2) is 7% -35%;
the hollow wave-transmitting ball is one of a glass fiber hollow ball, an organic glass hollow ball, a polyethylene hollow ball, a polyurethane hollow ball, a nylon hollow ball, an ABS plastic hollow ball and a polyvinyl chloride hollow ball; the diameter of the hollow sphere is 4-7 mm;
the Fe is 3 O 4 The volume filling rate of the magnetic fluid capsule in the cement-based material is 40% -65%.
2. The method of manufacturing according to claim 1, characterized in that:
the method for regulating the wave absorbing performance of the cement-based wave absorbing material comprises the following steps: the mode of applying a magnetic field on the outer side of the wave-absorbing material is adopted to change the existence form of nano ferroferric oxide in the magnetic fluid capsule, so that the electromagnetic parameters of the wave-absorbing material are regulated and controlled, and further the wave-absorbing frequency band, the wave-absorbing frequency width and the wave-absorbing intensity are regulated and controlled.
3. The preparation method according to claim 2, characterized in that:
the magnetic field strength is 1500-10000 Gs.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09248835A (en) * | 1996-03-15 | 1997-09-22 | Nitto Boseki Co Ltd | Production of sound absorbing and insulating composite plastic panel containing magnetic fluid included capsules |
| JPH1176801A (en) * | 1997-07-16 | 1999-03-23 | Matsumoto Yushi Seiyaku Co Ltd | Micro capsule containing magnetic body and use thereof |
| CN101042005A (en) * | 2007-04-18 | 2007-09-26 | 大连理工大学 | Cement radical composite wave-suction material and preparation method thereof |
| CN109111605A (en) * | 2018-08-03 | 2019-01-01 | 瑞声科技（南京）有限公司 | The preparation method and product of magnetorheological thermoplastic vulcanised elastomer damping material |
| CN110372254A (en) * | 2019-07-30 | 2019-10-25 | 广州建盛建材有限公司 | A kind of composite modifier and weak concrete as made from it |
| CN113072344A (en) * | 2021-04-23 | 2021-07-06 | 华南理工大学 | Double-layer cement-based wave-absorbing material with adjustable wave-absorbing performance and application method thereof |
-
2022
- 2022-11-14 CN CN202211418504.6A patent/CN115557741B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09248835A (en) * | 1996-03-15 | 1997-09-22 | Nitto Boseki Co Ltd | Production of sound absorbing and insulating composite plastic panel containing magnetic fluid included capsules |
| JPH1176801A (en) * | 1997-07-16 | 1999-03-23 | Matsumoto Yushi Seiyaku Co Ltd | Micro capsule containing magnetic body and use thereof |
| CN101042005A (en) * | 2007-04-18 | 2007-09-26 | 大连理工大学 | Cement radical composite wave-suction material and preparation method thereof |
| CN109111605A (en) * | 2018-08-03 | 2019-01-01 | 瑞声科技（南京）有限公司 | The preparation method and product of magnetorheological thermoplastic vulcanised elastomer damping material |
| CN110372254A (en) * | 2019-07-30 | 2019-10-25 | 广州建盛建材有限公司 | A kind of composite modifier and weak concrete as made from it |
| CN113072344A (en) * | 2021-04-23 | 2021-07-06 | 华南理工大学 | Double-layer cement-based wave-absorbing material with adjustable wave-absorbing performance and application method thereof |
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