CN106747044A - A kind of carbon black modified suction ripple cement - Google Patents
A kind of carbon black modified suction ripple cement Download PDFInfo
- Publication number
- CN106747044A CN106747044A CN201610990336.6A CN201610990336A CN106747044A CN 106747044 A CN106747044 A CN 106747044A CN 201610990336 A CN201610990336 A CN 201610990336A CN 106747044 A CN106747044 A CN 106747044A
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- CN
- China
- Prior art keywords
- eps
- cement
- carbon black
- expanded polystyrene
- suction ripple
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/022—Carbon
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/08—Macromolecular compounds porous, e.g. expanded polystyrene beads or microballoons
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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
- 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
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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
Abstract
The invention discloses a kind of carbon black modified suction ripple cement, including carbon black, expanded polystyrene (EPS) and portland cement, in the carbon black modified suction ripple cement, the filling rate of expanded polystyrene (EPS) is 40 70vol%, the particle diameter of expanded polystyrene (EPS) is 2 6mm, and the volume content of carbon black is 2 5%.The present invention is doped and added to carbon black and expanded polystyrene (EPS) in cement, and in the microwave frequency band of 8 18GHz, full frequency band reaches the absorption of more than 13.6dB so that the absorbing property enhancing of cement.
Description
Technical field
The present invention relates to new material technology field, more particularly to a kind of carbon black modified suction ripple cement.
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 adding wave transparent particle in cement matrix, although electromagnetic wave transparent material
Addition reduces the content of wave absorbing agent, but can be obviously improved the impedance matching of cement composite material, while wave transparent particle is passed through
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, multiple reflections and Multiple Scattering between each particle 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 can also produce certain to electromagnetic wave in itself
Loss, 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 small 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 carbon black modified suction ripple cement, the absorbing property of conventional cement is enabled to
Greatly improve.
In first invention of the invention, the suction of portland cement is improved using expanded polystyrene (EPS) is adulterated in cement
Ripple performance, although it is that frequency range can reach good wave-absorbing effect at certain, but it 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 it, so that its full frequency band possesses absorption higher.
It is that, up to this purpose, the present invention uses following technical scheme：
A kind of carbon black modified suction ripple cement, including carbon black, expanded polystyrene (EPS) and portland cement, it is described carbon black modified
Suction ripple cement in, the filling rate of expanded polystyrene (EPS) is 40-70vol%, and the particle diameter of expanded polystyrene (EPS) is 2-6mm,
The volume content of carbon black is 2-5%.
Preferably, the expanded polystyrene (EPS) is modified by 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 into the EPS particles and coupling agent for cleaning after stirring；
(3) dipping obtains the modified expanded polystyrene (EPS) in the surface after drying.
It is poor with inorganic silicic acid salt cement compatibility because EPS surfaces are hydrophobicity, and EPS grain densities are especially small,
Easily floated during with cement mixing and stirring, the uniformity of cement slurry is influenceed, in order to strengthen EPS particles and cement slurry
Compatibility, it is necessary to be pre-processed to EPS surfaces.Traditional method is to apply a layer binder in EPS particle surfaces, existing
Technology typically uses epoxy latex or polyethylene propionate, and it 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, contributes 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.EPS surfaces are cleaned with inorganic solvent first, is made EPS
Particle surface slightly soluble.With high polymer binder PVA dilute with waters, the EPS particles and coupling agent for cleaning are poured into after stirring.
Due to the dissolving of EPS particle surfaces cause its surface roughness 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 matched that with free space wave impedance, the wave transparent performance of material is poor.EPS particle dielectric constants than relatively low,
Can be as a kind of good electromagnetic wave transparent material.After it is added in portland cement, the stomata 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 EPS particles through surface at
After reason, with the compatibility of cement slurry preferably, its surface will be wrapped by one layer of cement layer after being sufficiently mixed with cement, 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, inhale 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 particles are added in cement matrix, material is improved
Wave transparent performance, decayed through multiple reflections and scattering process in FPS particle surfaces into the electromagnetic wave inside sample so that
The absorbing property of cement material is improve, after part carbon black is added in EPS filling concrete composites, the transmission of composite
Coefficient reduces, reflectance factor increase, but the electrical loss of carbon black increased incoming electromagnetic by the decay in material internal, so material
The absorbing property of material can obtain part raising.
Gradually increase with the increase of content of carbon black within the specific limits, i.e., absorption coefficient has a mistake for increase first
Journey.With the further increase of content of carbon black, the electric conductivity of composite is improved so that the wave transparent performance of material further drops
Low, electromagnetic wave strengthens in the reflex of specimen surface, so as to the absorbing property for causing composite is reduced.
Therefore above-mentioned consideration is based on, in the present invention, the volume content by carbon black in cement is set as 2-5%.
The present invention is doped and added to carbon black and expanded polystyrene (EPS) in cement, in the microwave frequency band of 8-18GHz, full frequency band
Reach absorption more than -13.6dB so that the absorbing property enhancing of cement.
Specific embodiment
Technical scheme is further illustrated below by specific embodiment.
Embodiment 1
A kind of carbon black modified suction ripple cement, including carbon black, expanded polystyrene (EPS) and portland cement, it is described carbon black modified
Suction ripple cement in, the filling rate of expanded polystyrene (EPS) is 40vol%, and the particle diameter of expanded polystyrene (EPS) is 2mm, carbon black
Volume content is 2%.
Embodiment 2
A kind of carbon black modified suction ripple cement, including carbon black, expanded polystyrene (EPS) and portland cement, it is described carbon black modified
Suction ripple cement in, the filling rate of expanded polystyrene (EPS) is 70vol%, and the particle diameter of expanded polystyrene (EPS) is 6mm, carbon black
Volume content is 5%.
Embodiment 3
A kind of carbon black modified suction ripple cement, including carbon black, expanded polystyrene (EPS) and portland cement, it is described carbon black modified
Suction ripple cement in, the filling rate of expanded polystyrene (EPS) is 50vol%, and the particle diameter of expanded polystyrene (EPS) is 4mm, carbon black
Volume content is 3%.
Embodiment 4
Carbon black and expanded polystyrene (EPS) are doped and added in embodiment of the present invention 1-3, in cement, in the Microwave Frequency of 8-18GHz
In section, full frequency band reaches absorption more than -13.6dB so that the absorbing property enhancing of cement.
Claims (2)
1. a kind of carbon black modified suction ripple cement, including carbon black, expanded polystyrene (EPS) and portland cement, it is described carbon black modified
Inhale in ripple cement, the filling rate of expanded polystyrene (EPS) is 40-70vol%, and the particle diameter of expanded polystyrene (EPS) is 2-6mm, charcoal
Black volume content is 2-5%.
2. carbon black modified suction ripple cement as claimed in claim 1, it is characterised in that the expanded polystyrene (EPS) is by surface
Modified, 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 into the EPS particles and coupling agent for cleaning 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 |
|---|---|---|---|
| CN201610990336.6A CN106747044A (en) | 2016-11-10 | 2016-11-10 | A kind of carbon black modified suction ripple cement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610990336.6A CN106747044A (en) | 2016-11-10 | 2016-11-10 | A kind of carbon black modified suction ripple cement |
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| Publication Number | Publication Date |
|---|---|
| CN106747044A true CN106747044A (en) | 2017-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201610990336.6A Pending CN106747044A (en) | 2016-11-10 | 2016-11-10 | A kind of carbon black modified suction ripple cement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109485329A (en) * | 2018-10-29 | 2019-03-19 | 裴泽民 | A kind of cement-based absorption material |
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|---|---|---|---|---|
| CN101033125A (en) * | 2007-02-05 | 2007-09-12 | 武汉理工大学 | Cement base composite construction materials capable of absorbing microwave |
| 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 | Nano titanium oxide doped cement-base composite wave-absorbing material 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 |
| CN105016676A (en) * | 2015-07-06 | 2015-11-04 | 济南大学 | Cement-based electromagnetic wave impedance matching material and preparation method therefor |
| CN105198328A (en) * | 2015-11-03 | 2015-12-30 | 济南大学 | Cement-based solar absorption material and preparation method thereof |
-
2016
- 2016-11-10 CN CN201610990336.6A patent/CN106747044A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101033125A (en) * | 2007-02-05 | 2007-09-12 | 武汉理工大学 | Cement base composite construction materials capable of absorbing microwave |
| 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 | Nano titanium oxide doped cement-base composite wave-absorbing material 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 |
| CN105016676A (en) * | 2015-07-06 | 2015-11-04 | 济南大学 | Cement-based electromagnetic wave impedance matching material and preparation method therefor |
| CN105198328A (en) * | 2015-11-03 | 2015-12-30 | 济南大学 | Cement-based solar absorption material and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109485329A (en) * | 2018-10-29 | 2019-03-19 | 裴泽民 | A kind of cement-based absorption material |
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Application publication date: 20170531 |