CN106515124A - Microwave absorbing cement structure - Google Patents
Microwave absorbing cement structure Download PDFInfo
- Publication number
- CN106515124A CN106515124A CN201610990050.8A CN201610990050A CN106515124A CN 106515124 A CN106515124 A CN 106515124A CN 201610990050 A CN201610990050 A CN 201610990050A CN 106515124 A CN106515124 A CN 106515124A
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- Prior art keywords
- eps
- graphene
- powder
- cement
- barium titanate
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Classifications
-
- 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
- B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
- B32B13/02—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material with fibres or particles being present as additives in the layer
-
- 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
- B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
- B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- 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
- 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
-
- 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
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/02—Synthetic macromolecular particles
- B32B2264/0214—Particles made of materials belonging to B32B27/00
- B32B2264/0228—Vinyl resin particles, e.g. polyvinyl acetate, polyvinyl alcohol polymers or ethylene-vinyl acetate copolymers
- B32B2264/0235—Aromatic vinyl resin, e.g. styrenic (co)polymers
-
- 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
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/10—Inorganic particles
- B32B2264/104—Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
-
- 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
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/10—Inorganic particles
- B32B2264/107—Ceramic
- B32B2264/108—Carbon, e.g. graphite particles
-
- 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
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/12—Mixture of at least two particles made of different materials
-
- 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
- B32B2307/212—Electromagnetic interference shielding
-
- 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
Abstract
The invention discloses a microwave absorbing cement structure, comprising a surface layer and a facial layer; the surface layer comprises foaming polystyrene and silicate cement; the filling rate of foaming polystyrene is 40-70 vol%, and the granular diameter of the foaming polystyrene is 2-6 mm; the bottom layer includes graphene/ barium titanate powder and silicate cement, and the content of the graphene/ barium titanate powder is 5-15%; the volume rate of graphene and barium titanate is 2: 1-1: 2. The foaming polystyrene is mixed in the cement surface layer, and the graphene/ barium titanate powder is mixed in the bottom layer, thus the microwave absorbing ability in 8-18 GHz frequency section can reach 12 db above, thus the cement wave-absorbing performance is enhanced.
Description
Technical field
The present invention relates to new material technology field, more particularly to a kind of suction ripple cement structures.
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 wave impedance
Matching degree, therefore absorbing property raising degree is little.If wave transparent particle is added 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 particle Jing
After cement mixing, its surface can be wrapped by one layer of cement layer, also can produce scattering and reflex to incident electromagnetic wave.When saturating
When the number of ripple particle is enough, the decay to incident electromagnetic wave is played by the multiple reflections and Multiple Scattering between each particle
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 particle 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 it is 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 suction ripple cement structures, the absorbing property for enabling to conventional cement is carried significantly
It is high.
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 to inhale ripple cement structures, which includes superficial layer and bottom；
Superficial 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 Graphene/barium carbonate powder and portland cement, and Graphene/barium carbonate powder content is 5-15%,
Graphene：Barium titanate volume ratio is 2:1-1:2.
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 particles and coupling agent for cleaning into after stirring；
(3) dipping obtains the modified expanded polystyrene (EPS) in the surface after drying.
The graphene powder/barium titanate powder preparation is as follows：
(1), under condition of ice bath, under mechanical agitation, crystalline graphite powder is added in 98% concentrated sulfuric acid, add and account for
The sodium nitrate of graphite powder 50-80wt%, and to account for and react 30-120min under the potassium permanganate of 2-4 times of weight of graphite powder, 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 being dried；
(3) described graphene oxide is distributed in ethanol solution, ultrasonic disperse obtains graphene oxide colloid
Solution；
(4) the graphene oxide colloidal solution is heated to into 65-75 DEG C, stirring is lower to add mass concentration to be 70-85%
Hydrazine hydrate, reaction 0.5-2 hours after, according to Graphene:Barium titanate mass ratio is 2:1～1:2 ratio, adds barium titanate powder
End, is well mixed；
(5) centrifugation wash, vacuum drying obtains graphene powder/barium carbonate powder.
It is as EPS surfaces are hydrophobicity, poor with 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 particles and cement slurry
Compatibility, need to pre-process 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 particle tables in the mixed process of EPS particles
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 particles and between EPS particles 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 particles 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 particles, with
When binding agent mixes, the contact interface area between EPS particles 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 and some ore deposits in cement composition
The dielectric loss and magnetic loss of thing material, absorbing property is than relatively low, and cement sample is dense, so as to cause the defeated of material
Enter wave impedance not matching that with free space wave 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 wave impedance.And at EPS particle Jing surfaces
After reason, with the compatibility of cement slurry preferably, after being sufficiently mixed with cement, its surface will be wrapped by one layer of cement layer, 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 particle, so as to improve material on incident electricity
The loss and absorption of magnetic wave.
After adding EPS particles 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.
As the absorption in superficial layer for microwave is all based on the reflection and scattering of EPS, its absorption pattern is single.This
It is bright to add microwave absorbing material Graphene/barium carbonate powder in cement bottom layer so that the microwave that EPS wave transparents particle is transmitted and come
Absorbed, increased its wave-absorbing effect.
The present invention is doped and added to expanded polystyrene (EPS) in cement surface layer, and Graphene/metatitanic acid is doped and added in bottom
Barium powder,, 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
Superficial layer includes expanded polystyrene (EPS) and portland cement, and the filling rate of expanded polystyrene (EPS) is 40vol%, is foamed
The particle diameter of polystyrene is 2mm；
Bottom includes Graphene/barium carbonate powder and portland cement, and Graphene/barium carbonate powder content is 5%, graphite
Alkene：Barium titanate volume ratio is 2:1.
Embodiment 2
Superficial layer includes expanded polystyrene (EPS) and portland cement, and the filling rate of expanded polystyrene (EPS) is 70vol%, is foamed
The particle diameter of polystyrene is 6mm；
Bottom includes Graphene/barium carbonate powder and portland cement, and Graphene/barium carbonate powder content is 15%, stone
Black alkene：Barium titanate volume ratio is 1:2.
Embodiment 3
Superficial layer includes expanded polystyrene (EPS) and portland cement, and the filling rate of expanded polystyrene (EPS) is 50vol%, is foamed
The particle diameter of polystyrene is 4mm；
Bottom includes Graphene/barium carbonate powder and portland cement, and Graphene/barium carbonate powder content is 10%, stone
Black alkene：Barium titanate volume ratio is 1：1.
The suction ripple cement of embodiment of the present invention 1-3,, in the frequency range of 8-18GHz, wave-sucking performance reaches more than -12db for which,
Far above the combination of ordinary cement+expanded polystyrene (EPS).
Claims (3)
1. a kind of to inhale ripple cement structures, which includes superficial layer and bottom；
Superficial layer includes expanded polystyrene (EPS) and portland cement, and the filling rate of expanded polystyrene (EPS) is 40-70vol%, is foamed
The particle diameter of polystyrene is 2-6mm；
Bottom includes Graphene/barium carbonate powder and portland cement, and Graphene/barium carbonate powder content is 5-15%, graphite
Alkene：Barium titanate volume ratio is 2:1-1:2.
It is 2. as claimed in claim 1 to inhale ripple cement structures, it is characterised in that the expanded polystyrene (EPS) is modified through surface,
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 particles and coupling agent for cleaning into after stirring；
(3) dipping obtains the modified expanded polystyrene (EPS) in the surface after drying.
3. it is as claimed in claim 1 or 2 to inhale ripple cement structures, it is characterised in that the graphene powder/barium titanate powder system
Preparation Method is as follows：
(1), under condition of ice bath, under mechanical agitation, crystalline graphite powder is added in 98% concentrated sulfuric acid, add and account for graphite
The sodium nitrate of powder 50-80wt%, and to account for and react 30-120min under the potassium permanganate of 2-4 times of weight of graphite powder, 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 being dried；
(3) described graphene oxide is distributed in ethanol solution, ultrasonic disperse obtains graphene oxide colloidal solution；
(4) the graphene oxide colloidal solution is heated to into 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:Barium titanate mass ratio is 2:1～1:2 ratio, adds barium titanate powder,
It is well mixed；
(5) centrifugation wash, vacuum drying obtains graphene powder/barium carbonate powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610990050.8A CN106515124A (en) | 2016-11-10 | 2016-11-10 | Microwave absorbing cement structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610990050.8A CN106515124A (en) | 2016-11-10 | 2016-11-10 | Microwave absorbing cement structure |
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| CN106515124A true CN106515124A (en) | 2017-03-22 |
Family
ID=58350925
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| CN201610990050.8A Pending CN106515124A (en) | 2016-11-10 | 2016-11-10 | Microwave absorbing cement structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110272243A (en) * | 2019-06-21 | 2019-09-24 | 中国人民解放***箭军工程大学 | A kind of double-layer cement base wave-absorbing material and preparation method thereof |
| CN114315412A (en) * | 2022-01-27 | 2022-04-12 | 西安建筑科技大学 | Modified EPS particles, modification method thereof, concrete containing modified EPS particles and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110272243A (en) * | 2019-06-21 | 2019-09-24 | 中国人民解放***箭军工程大学 | A kind of double-layer cement base wave-absorbing material and preparation method thereof |
| CN110272243B (en) * | 2019-06-21 | 2021-11-05 | 中国人民解放***箭军工程大学 | Double-layer cement-based wave-absorbing material and preparation method thereof |
| CN114315412A (en) * | 2022-01-27 | 2022-04-12 | 西安建筑科技大学 | Modified EPS particles, modification method thereof, concrete containing modified EPS particles and preparation method thereof |
| CN114315412B (en) * | 2022-01-27 | 2022-10-11 | 西安建筑科技大学 | Modified EPS particles, modification method thereof, concrete containing modified EPS particles and preparation method thereof |
| US11732103B2 (en) | 2022-01-27 | 2023-08-22 | Xi'an University Of Architecture And Technology | Modified expanded polystyrene particles, modification method thereof, concrete containing modified expanded polystyrene |
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Application publication date: 20170322 |