CN106517948A - Manganese-dioxide-modified wave-absorbing cement - Google Patents
Manganese-dioxide-modified wave-absorbing cement Download PDFInfo
- Publication number
- CN106517948A CN106517948A CN201610990339.XA CN201610990339A CN106517948A CN 106517948 A CN106517948 A CN 106517948A CN 201610990339 A CN201610990339 A CN 201610990339A CN 106517948 A CN106517948 A CN 106517948A
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- Prior art keywords
- eps
- cement
- manganese dioxide
- expanded polystyrene
- modified
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Classifications
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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
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a manganese-dioxide-modified wave-absorbing cement which comprises manganese dioxide, foamed polystyrene and Portland cement. In the manganese-dioxide-modified wave-absorbing cement, the filling ratio of the foamed polystyrene is 40-70 vol%, the particle diameter of the foamed polystyrene is 2-6mm, and the volume content of the manganese dioxide is 2-5%. By doping the manganese dioxide and foamed polystyrene into the cement, the absorptivity of -13.6dB or above can be reached within the whole microwave frequency band of 8-18 GHz, so that the wave-absorbing property of the cement is enhanced.
Description
Technical field
A kind of the present invention relates to new material technology field, more particularly to the suction ripple cement that manganese dioxide is modified.
Background technology
Cement material is various composites for including Multimetal oxide, itself has certain absorbing property,
But cement material to the absorption of electromagnetic wave mainly by subscale electromagnetic consumable, absorbing property is than relatively low.In cement matrix
After adding traditional wave absorbing agent, although the absorbing property of cement material can be improved, greatly reduce and space natural impedance
Matching degree, therefore absorbing property raising degree is little.If adding wave transparent granule in cement matrix, although electromagnetic wave transparent material
Adding reduces the content of wave absorbing agent, but can be obviously improved the impedance matching of cement composite material, while wave transparent granule Jing
After cement mixing, its surface can be wrapped by one layer of cement layer, also can produce scattering and reflection to incident electromagnetic wave.When saturating
When the number of ripple granule is enough, the decay to incident electromagnetic wave is played by the multiple reflections and Multiple Scattering between each granule
The important effect of root.Simultaneously during the Multiple Scattering of electromagnetic wave, cement matrix itself also can produce certain to electromagnetic wave
It is lost, therefore the addition of wave transparent granule is expected to greatly improve the absorbing property of cement composite material.
Expanded polystyrene (EPS) (Expanded polystyrene, EPS) is a kind lightweight, includes the bubble of little continuous pore
The series of advantages such as foam, water suction firm low, acid and alkali-resistance low with density, good heat preservation performance, in industrial or agricultural, transportation and building
It has been used widely in the fields such as industry.But be applied to absorbing material field, there is not yet report.
The content of the invention
It is an object of the invention to propose a kind of modified suction ripple cement of manganese dioxide, the suction ripple of conventional cement is enabled to
Performance is greatly improved.
In the first invention of the present invention, using the expanded polystyrene (EPS) that adulterates in cement, the suction of portland cement is improved
Ripple performance, although which is that frequency range can reach good wave-absorbing effect at certain, but which is in the microwave frequency band of 8-18GHz, very
Difficult full frequency band reaches the absorption of -10dB, therefore the present invention is improved to which, so that its full frequency band possesses higher absorption.
It is that, up to this purpose, the present invention is employed the following technical solutions：
A kind of modified suction ripple cement of manganese dioxide, it is including manganese dioxide, expanded polystyrene (EPS) and portland cement, described
In the modified suction ripple cement of manganese dioxide, the filling rate of expanded polystyrene (EPS) is 40-70vol%, the granule of expanded polystyrene (EPS)
A diameter of 2-6mm, the volume content of manganese dioxide is 2-5%.
Preferably, the expanded polystyrene (EPS) is modified through surface, and method of modifying is as follows：
(1) EPS surfaces are cleaned with inorganic solvent, is made EPS particle surface slightly solubles；
(2) high polymer binder PVA dilute with waters, pour the EPS granules and coupling agent for cleaning into after stirring；
(3) dipping obtains the modified expanded polystyrene (EPS) in the surface after drying.
It is as EPS surfaces are hydrophobicity, poor with the inorganic silicic acid salt cement compatibility, and EPS grain densities are especially little,
Easily float during with cement mixing and stirring, affect the uniformity of cement slurry, in order to strengthen EPS granules and cement slurry
Affinity, need to carry out pretreatment to EPS surfaces.Traditional method is to apply a layer binder in EPS particle surfaces, existing
Technology typically adopts epoxy latex or polyethylene propionate, and which can make EPS granule tables in the mixed process of EPS granules
Face is in a kind of tacky state, after cement slurry is added, can form one layer of cementitious coating in EPS particle surfaces, contribute to
Bonding between EPS granules and between EPS granules and cement matrix, but this method substantially increases EPS cementitious composite materials
The cost of manufacture of material.
Present invention employs a kind of brand-new handling process.First EPS surfaces are cleaned with inorganic solvent, EPS is made
Particle surface slightly soluble.With high polymer binder PVA dilute with waters, the EPS granules and coupling agent for cleaning after stirring, is poured into.
As the dissolving of EPS particle surfaces causes its surface roughness to increase, substantially increase the specific surface area of EPS granules, with
When binding agent mixes, the contact interface area between EPS granules and binding agent is just considerably increased, improve between the two is viscous
Knot performance.
Portland cement is to the decay of electromagnetic wave mainly by the metal-oxide in cement composition and some ore deposits
The dielectric loss of thing material and magnetic loss, absorbing property is than relatively low, and cement sample is dense, so as to cause the defeated of material
Enter natural impedance not matching that with free space natural impedance, the wave transparent performance of material is poor.EPS particle dielectric constants than relatively low,
Can be used as a kind of good electromagnetic wave transparent material.After it is added in portland cement, the pore of cement-base composite material can be adjusted
Rate and electromagnetic parameter, substantially increase the matching degree of composite impedance and space natural impedance.And at EPS granule Jing surfaces
After reason, preferably, after being sufficiently mixed with cement, its surface will be wrapped by one layer of cement layer for the compatibility with cement slurry, can be with
Scattered portion electromagnetic wave, therefore EPS filling concretes composite can be equivalent to a kind of closed pore absorbent structure.Work as incident electromagnetic wave
During into composite inner, multiple reflections and scattering will occur between each granule, so as to improve material on incident electricity
The loss and absorption of magnetic wave.
After adding EPS granules in cement, the absorbing property of sample is all improved.During addition 40vol%EPS, reflection is damaged
Consumption reaches -7～-10dB, and the absorbing property of sample increases with the increase of frequency, when frequency reaches 17.7GHz, sample
Reflection loss reached -10.02dB；After EPS filling rates reach 60vol%, absorbing property continues with the increase of frequency
Increase, after frequency is more than 12GHZ, the absorbing property of sample is better than -10dB, when frequency reaches 18GHz, inhales crossing property
- 15.27dB can be reached, a width of 6.2GHz of band better than -10dB, when EPS loadings continue to increase to 70%, material is absorbed
Suction is draped over one's shoulders performance and is declined on the contrary.
The absorbing property of material is the synthesis of material wave transparent performance and drain performance, and material will have good wave absorbtion
Can, it is necessary to assure the wave transparent performance of material reaches certain requirement.After EPS granules are added in cement matrix, material is improved
Wave transparent performance, decayed into the electromagnetic wave inside sample in FPS particle surface Jing multiple reflections and scattering process, so as to
The absorbing property of cement material is improve, after part manganese dioxide is added in EPS filling concrete composites, composite
Transmission coefficient reduces, reflection coefficient increase, but the electrical loss of manganese dioxide increased incoming electromagnetic by declining in material internal
Subtract, so the absorbing property of material can obtain part raising.
Gradually increase with the increase of manganese dioxide content within the specific limits, i.e., absorptance has an increase first
Process.With the further increase of manganese dioxide content, the electric conductivity of composite is improved so that the wave transparent performance of material is entered
One step is reduced, and electromagnetic wave strengthens in the reflex of specimen surface, so as to the absorbing property for causing composite is reduced.
Manganese dioxide is a kind of distorted octahedron structure centered on manganese atom, and octahedral summit is accounted for by oxygen atom
Octahedral structure is formed according to, each manganese atom by six oxygen atoms are surrounded.In pyrolusite and the crystal of amorphous manganese dioxide
Contain larger tunnel and hole in structure.On the one hand this tunnel and void structure can receive other lewis' acids to enter
Enter the structure, on the other hand positive and negative charge is easily moved to the two poles of the earth under electromagnetic field effect, be finally collected at interface and produce boundary
Surface polarization and sky ask charge polarization, and this polarization is to cause MnO2One of major reason of dielectric material loss.
Under electromagnetic field effect, the carrier in manganese dioxide structure causes localization to pile up, so as to cause space charge
Polarization, as the accumulation of space charge carrier needs the regular hour, so that the axial direction of carrier and additional electromagnetic field
Direction is identical, so having different polarization intensities at different frequencies, thereby results in the Dispersion of manganese dioxide particle.
Therefore above-mentioned consideration is based on, in the present invention, the volume content by manganese dioxide in cement is set as 2-5%.
The present invention is doped and added to manganese dioxide and expanded polystyrene (EPS) in cement, in the microwave frequency band of 8-18GHz, entirely
Frequency range reaches the absorption of more than -13.6dB so that the absorbing property of cement strengthens.
Specific embodiment
Technical scheme is further illustrated below by specific embodiment.
Embodiment 1
A kind of modified suction ripple cement of manganese dioxide, it is including manganese dioxide, expanded polystyrene (EPS) and portland cement, described
In the modified suction ripple cement of manganese dioxide, the filling rate of expanded polystyrene (EPS) is 40vol%, the particle diameter of expanded polystyrene (EPS)
For 2mm, the volume content of manganese dioxide is 2%.
Embodiment 2
A kind of modified suction ripple cement of manganese dioxide, it is including manganese dioxide, expanded polystyrene (EPS) and portland cement, described
In the modified suction ripple cement of manganese dioxide, the filling rate of expanded polystyrene (EPS) is 70vol%, the particle diameter of expanded polystyrene (EPS)
For 6mm, the volume content of manganese dioxide is 5%.
Embodiment 3
A kind of modified suction ripple cement of manganese dioxide, it is including manganese dioxide, expanded polystyrene (EPS) and portland cement, described
In the modified suction ripple cement of manganese dioxide, the filling rate of expanded polystyrene (EPS) is 50vol%, the particle diameter of expanded polystyrene (EPS)
For 4mm, the volume content of manganese dioxide is 3%.
In embodiment of the present invention 1-3, manganese dioxide and expanded polystyrene (EPS) is doped and added in cement, in the micro- of 8-18GHz
In wave frequency section, full frequency band reaches the absorption of more than -13.6dB so that the absorbing property of cement strengthens.
Claims (2)
1. the modified suction ripple cement of a kind of manganese dioxide, including manganese dioxide, expanded polystyrene (EPS) and portland cement, described two
In the modified suction ripple cement of manganese oxide, the filling rate of expanded polystyrene (EPS) is 40-70vol%, and the granule of expanded polystyrene (EPS) is straight
Footpath is 2-6mm, and the volume content of manganese dioxide is 2-5%.
2. the suction ripple cement that manganese dioxide as claimed in claim 1 is modified, it is characterised in that the expanded polystyrene (EPS) is passed through
Surface is modified, and method of modifying is as follows：
(1) EPS surfaces are cleaned with inorganic solvent, is made EPS particle surface slightly solubles；
(2) high polymer binder PVA dilute with waters, pour the EPS granules and coupling agent for cleaning into after stirring；
(3) dipping obtains the modified expanded polystyrene (EPS) in the surface after drying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610990339.XA CN106517948A (en) | 2016-11-10 | 2016-11-10 | Manganese-dioxide-modified wave-absorbing cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610990339.XA CN106517948A (en) | 2016-11-10 | 2016-11-10 | Manganese-dioxide-modified wave-absorbing cement |
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| CN106517948A true CN106517948A (en) | 2017-03-22 |
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| CN201610990339.XA Pending CN106517948A (en) | 2016-11-10 | 2016-11-10 | Manganese-dioxide-modified wave-absorbing cement |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101042005A (en) * | 2007-04-18 | 2007-09-26 | 大连理工大学 | Cement radical composite wave-suction material and preparation method thereof |
| CN101186474A (en) * | 2007-12-07 | 2008-05-28 | 东华理工大学 | Cement-based composite wave-absorbing material doped with nano titanium oxide and preparation method thereof |
| CN102627422A (en) * | 2012-04-20 | 2012-08-08 | 大连理工大学 | Pumice wave absorbing aggregate with electromagnetic wave absorbing function and preparation method of pumice wave absorbing aggregate |
| CN104649633A (en) * | 2015-02-16 | 2015-05-27 | 福建省盛威建设发展有限公司 | Electromagnetic wave absorbing concrete and preparation method thereof |
-
2016
- 2016-11-10 CN CN201610990339.XA patent/CN106517948A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101042005A (en) * | 2007-04-18 | 2007-09-26 | 大连理工大学 | Cement radical composite wave-suction material and preparation method thereof |
| CN101186474A (en) * | 2007-12-07 | 2008-05-28 | 东华理工大学 | Cement-based composite wave-absorbing material doped with nano titanium oxide and preparation method thereof |
| CN102627422A (en) * | 2012-04-20 | 2012-08-08 | 大连理工大学 | Pumice wave absorbing aggregate with electromagnetic wave absorbing function and preparation method of pumice wave absorbing aggregate |
| CN104649633A (en) * | 2015-02-16 | 2015-05-27 | 福建省盛威建设发展有限公司 | Electromagnetic wave absorbing concrete and preparation method thereof |
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Application publication date: 20170322 |
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