CN106495618A - A kind of magnetic inhales ripple cement structures - Google Patents
A kind of magnetic inhales ripple cement structures Download PDFInfo
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- CN106495618A CN106495618A CN201610990057.XA CN201610990057A CN106495618A CN 106495618 A CN106495618 A CN 106495618A CN 201610990057 A CN201610990057 A CN 201610990057A CN 106495618 A CN106495618 A CN 106495618A
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- Prior art keywords
- eps
- graphene
- ferroso
- cement
- ferric oxide
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Classifications
-
- 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
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
-
- 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
Abstract
The invention discloses a kind of magnetic inhales ripple cement structures, which includes surface layer and bottom；Surface layer includes expanded polystyrene (EPS) and portland cement, and the filling rate of expanded polystyrene (EPS) is 40 70vol%, and the particle diameter of expanded polystyrene (EPS) is 2 6mm；Bottom includes Graphene/ferroso-ferric oxide powder body and portland cement, and Graphene/ferroso-ferric oxide powder content is 5 15%, Graphene：Ferroso-ferric oxide volume ratio is 2:1‑1:2.The present invention is doped and added to expanded polystyrene (EPS) in cement surface layer, is doped and added to Graphene/ferroso-ferric oxide powder body in bottom, and, in the frequency range of 8 18GHz, wave-sucking performance reaches more than 12db for which so that the absorbing property of cement strengthens.
Description
Technical field
A kind of the present invention relates to new material technology field, more particularly to suction ripple cement.
Background technology
Cement material is multiple composites for including Multimetal oxide, and itself there is 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 warp
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, multiple reflections and Multiple Scattering between each granule will be played to the decay of incident electromagnetic wave
The important effect of root.Simultaneously during the Multiple Scattering of electromagnetic wave, cement matrix itself also can produce certain to electromagnetic wave
Loss, the therefore addition of wave transparent granule are expected to the absorbing property for greatly improving 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.
Content of the invention
It is an object of the invention to proposing a kind of magnetic inhales ripple cement structures, the absorbing property for enabling to conventional cement is big
Big raising.
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, and therefore the present invention is improved to which, so that its full frequency band possesses higher absorption.
It is that the present invention is employed the following technical solutions up to this purpose：
A kind of magnetic inhales ripple cement structures, and which includes surface layer and bottom；
Surface layer includes expanded polystyrene (EPS) and portland cement, and the filling rate of expanded polystyrene (EPS) is 40-70vol%,
The particle diameter of expanded polystyrene (EPS) is 2-6mm；
Bottom includes that Graphene/ferroso-ferric oxide powder body and portland cement, Graphene/ferroso-ferric oxide powder content are
5-15%, Graphene：Ferroso-ferric oxide volume ratio is 2:1-1:2.
Preferably, through surface modification, method of modifying is as follows for the expanded polystyrene (EPS)：
(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 expanded polystyrene (EPS) of the surface modification after drying.
The graphene powder/ferroso-ferric oxide powder preparation method is as follows：
(1), under condition of ice bath, under mechanical agitation, crystalline graphite powder is added in 98% concentrated sulphuric acid, add and account for
The sodium nitrate of graphite powder 50-80wt%, and the potassium permanganate of 2-4 times of weight of graphite powder is accounted for, 30-120min is reacted under ice bath；
(2) 30-40 DEG C of constant temperature 4-5h is heated to, deionized water and hydrogen peroxide is added, 1-3h is stirred, 5% concentration is added
HCl centrifuge washings are until sulfate radical-free ion, obtains graphene oxide after drying；
(3) described graphene oxide is distributed in ethanol solution, ultrasonic disperse obtains graphene oxide colloid
Solution；
(4) the graphene oxide colloid solution is heated to 65-75 DEG C, stirring is lower to add mass concentration for 70-85%
Hydrazine hydrate, reaction 0.5-2 hours after, according to Graphene:Ferroso-ferric oxide mass ratio is 2:1～1:2 ratio, adds four oxygen
Change three iron powders, mix homogeneously；
(5) centrifugation wash, vacuum drying obtains graphene powder/ferroso-ferric oxide powder body.
As EPS surfaces are hydrophobicity, poor with the inorganic silicic acid salt cement compatibility, and EPS grain densities are especially little,
With cement mixing and stirring during easily float, affect cement slurry uniformity, 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 using epoxy latex or polyethylene propionate, its with the mixed process of EPS granules in, EPS granule tables can be made
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, is made EPS
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 EPS granules through surface at
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
When entering 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.When adding 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, a width of 6.2GHz of band of the absorption better than -10dB, when EPS loadings continue to increase to 70%, material can be reached
Suction is draped over one's shoulders performance and is declined on the contrary.
As the absorption in surface layer for microwave is all based on the reflection and scattering of EPS, its absorption pattern is single.This
Bright in cement bottom layer add microwave absorbing material Graphene/ferroso-ferric oxide powder body so that EPS wave transparent granule transmissions and come
Microwave is absorbed, and increased its wave-absorbing effect.
The present invention is doped and added to expanded polystyrene (EPS) in cement surface layer, is doped and added to Graphene/tetra- oxygen in bottom
Change three iron powder bodies,, in the frequency range of 8-18GHz, wave-sucking performance reaches more than -12db for which so that the absorbing property of cement strengthens.
Specific embodiment
Technical scheme is further illustrated below by specific embodiment.
Embodiment 1
A kind of magnetic inhales ripple cement structures, and which includes surface layer and bottom；
Surface layer includes expanded polystyrene (EPS) and portland cement, and the filling rate of expanded polystyrene (EPS) is 40vol%, foams
The particle diameter of polystyrene is 2mm；
Bottom includes that Graphene/ferroso-ferric oxide powder body and portland cement, Graphene/ferroso-ferric oxide powder content are
5%, Graphene：Ferroso-ferric oxide volume ratio is 2:1.
Embodiment 2
A kind of magnetic inhales ripple cement structures, and which includes surface layer and bottom；
Surface layer includes expanded polystyrene (EPS) and portland cement, and the filling rate of expanded polystyrene (EPS) is 70vol%, foams
The particle diameter of polystyrene is 6mm；
Bottom includes that Graphene/ferroso-ferric oxide powder body and portland cement, Graphene/ferroso-ferric oxide powder content are
15%, Graphene：Ferroso-ferric oxide volume ratio is 1:2.
Embodiment 3
A kind of magnetic inhales ripple cement structures, and which includes surface layer and bottom；
Surface layer includes expanded polystyrene (EPS) and portland cement, and the filling rate of expanded polystyrene (EPS) is 50vol%, foams
The particle diameter of polystyrene is 4mm；
Bottom includes that Graphene/ferroso-ferric oxide powder body and portland cement, Graphene/ferroso-ferric oxide powder content are
10%, Graphene：Ferroso-ferric oxide volume ratio is 1：1.
The magnetic of embodiment of the present invention 1-3 inhales ripple cement structures, its in the frequency range of 8-18GHz, wave-sucking performance reaches-
More than 12db, far above the combination of ordinary cement+expanded polystyrene (EPS).
Claims (3)
1. a kind of magnetic inhales ripple cement structures, and which includes surface layer and bottom；
Surface layer includes expanded polystyrene (EPS) and portland cement, and the filling rate of expanded polystyrene (EPS) is 40-70vol%, foams
The particle diameter of polystyrene is 2-6mm；
Bottom includes Graphene/ferroso-ferric oxide powder body and portland cement, and Graphene/ferroso-ferric oxide powder content is 5-
15%, Graphene：Ferroso-ferric oxide volume ratio is 2:1-1:2.
2. magnetic as claimed in claim 1 inhales ripple cement structures, it is characterised in that the expanded polystyrene (EPS) changes through surface
Property, 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 expanded polystyrene (EPS) of the surface modification after drying.
3. magnetic as claimed in claim 1 or 2 inhales ripple cement structures, it is characterised in that graphene powder/tetra- oxidation three
Iron powder preparation is as follows：
(1), under condition of ice bath, under mechanical agitation, crystalline graphite powder is added in 98% concentrated sulphuric acid, add and account for graphite
The sodium nitrate of powder 50-80wt%, and the potassium permanganate of 2-4 times of weight of graphite powder is accounted for, 30-120min is reacted under ice bath；
(2) be heated to 30-40 DEG C of constant temperature 4-5h, add deionized water and hydrogen peroxide, stir 1-3h, add the HCl of 5% concentration from
Heart washing is until sulfate radical-free ion, obtains graphene oxide after drying；
(3) described graphene oxide is distributed in ethanol solution, ultrasonic disperse obtains graphene oxide colloid solution；
(4) the graphene oxide colloid solution is heated to 65-75 DEG C, stirring is lower to add mass concentration for the water of 70-85%
Hydrazine is closed, after reaction 0.5-2 hours, according to Graphene:Ferroso-ferric oxide mass ratio is 2:1～1:2 ratio, adds four oxidations three
Iron powder, mix homogeneously；
(5) centrifugation wash, vacuum drying obtains graphene powder/ferroso-ferric oxide powder body.
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| CN201610990057.XA CN106495618A (en) | 2016-11-10 | 2016-11-10 | A kind of magnetic inhales ripple cement structures |
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| CN201610990057.XA CN106495618A (en) | 2016-11-10 | 2016-11-10 | A kind of magnetic inhales ripple cement structures |
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Cited By (9)
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| CN107673647A (en) * | 2017-10-12 | 2018-02-09 | 王玉红 | Ripple additive and preparation method thereof is inhaled in a kind of cement base dedusting |
| CN108274875A (en) * | 2018-01-05 | 2018-07-13 | 东南大学 | A kind of magnetism cement glass felt face Rigid foam polyurethane and preparation method thereof |
| CN108314380A (en) * | 2018-01-31 | 2018-07-24 | 广州大学 | A kind of graphene oxide-ferroso-ferric oxide magnetic liquid-cement-base composite material and preparation method thereof |
| CN109626893A (en) * | 2019-01-29 | 2019-04-16 | 济南大学 | Cement ceiling board and its semidry method preparation process with electro-magnetic screen function |
| CN109851298A (en) * | 2019-01-24 | 2019-06-07 | 济南大学 | Electromagnetically shielding cement plate and its semidry method preparation process |
| CN110451893A (en) * | 2019-08-28 | 2019-11-15 | 成都理工大学 | A kind of development of cement base electromagnetism composite material, preparation method and applications |
| CN111807772A (en) * | 2020-07-14 | 2020-10-23 | 李焕醒 | Pumice concrete with electromagnetic wave absorption function and preparation method thereof |
| CN117164933A (en) * | 2023-10-09 | 2023-12-05 | 亿策科技有限公司 | Polystyrene foam wave-absorbing material with surface modified by polarization and preparation method thereof |
| CN117164933B (en) * | 2023-10-09 | 2024-04-19 | 亿策科技有限公司 | Polystyrene foam wave-absorbing material with surface modified by polarization and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107673647A (en) * | 2017-10-12 | 2018-02-09 | 王玉红 | Ripple additive and preparation method thereof is inhaled in a kind of cement base dedusting |
| CN108274875A (en) * | 2018-01-05 | 2018-07-13 | 东南大学 | A kind of magnetism cement glass felt face Rigid foam polyurethane and preparation method thereof |
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| CN108314380A (en) * | 2018-01-31 | 2018-07-24 | 广州大学 | A kind of graphene oxide-ferroso-ferric oxide magnetic liquid-cement-base composite material and preparation method thereof |
| CN109851298B (en) * | 2019-01-24 | 2021-07-30 | 济南大学 | Electromagnetic shielding cement board and semi-dry method preparation process thereof |
| CN109851298A (en) * | 2019-01-24 | 2019-06-07 | 济南大学 | Electromagnetically shielding cement plate and its semidry method preparation process |
| CN109626893B (en) * | 2019-01-29 | 2021-05-25 | 济南大学 | Cement ceiling board with electromagnetic shielding function and semi-dry method preparation process thereof |
| CN109626893A (en) * | 2019-01-29 | 2019-04-16 | 济南大学 | Cement ceiling board and its semidry method preparation process with electro-magnetic screen function |
| CN110451893A (en) * | 2019-08-28 | 2019-11-15 | 成都理工大学 | A kind of development of cement base electromagnetism composite material, preparation method and applications |
| CN110451893B (en) * | 2019-08-28 | 2022-04-15 | 成都理工大学 | Cement-based electromagnetic development composite material, preparation method and application thereof |
| CN111807772A (en) * | 2020-07-14 | 2020-10-23 | 李焕醒 | Pumice concrete with electromagnetic wave absorption function and preparation method thereof |
| CN117164933A (en) * | 2023-10-09 | 2023-12-05 | 亿策科技有限公司 | Polystyrene foam wave-absorbing material with surface modified by polarization and preparation method thereof |
| CN117164933B (en) * | 2023-10-09 | 2024-04-19 | 亿策科技有限公司 | Polystyrene foam wave-absorbing material with surface modified by polarization and preparation method thereof |
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Application publication date: 20170315 |