CN1323158A - Construction method for radio wave absorber and built-in material - Google Patents
Construction method for radio wave absorber and built-in material Download PDFInfo
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- CN1323158A CN1323158A CN00135588A CN00135588A CN1323158A CN 1323158 A CN1323158 A CN 1323158A CN 00135588 A CN00135588 A CN 00135588A CN 00135588 A CN00135588 A CN 00135588A CN 1323158 A CN1323158 A CN 1323158A
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/18—Conductive material dispersed in non-conductive inorganic material the conductive material comprising carbon-silicon compounds, carbon or silicon
-
- 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
- B32B13/14—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material next to a fibrous or filamentary 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/025—Electric or magnetic properties
-
- 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
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
-
- 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
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/108—Rockwool fibres
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Building Environments (AREA)
- Aerials With Secondary Devices (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides an electric wave absorber showing high electric wave absorption performance and a method for applying an interior trimming material. The electric wave absorber 10 has at least a first layer 14 and a second layer 16 which contain a conductive fiber respectively. The electric wave which is incident into the electric wave absorber 10 is attenuated through the passage of the wave inside the first layer 14 and the second layer 16. In addition, a reflected wave reflecting on the first layer 14 and a reflected wave reflecting on the second layer 16 interfer with each other to cancel their mutual effect and thus the attenuation is achieved. Consequently, the mutual interference of the reflected waves enhances the electric wave absorption performance of the electric wave absorber 10.
Description
Employed wave absorber when the present invention relates in order to eliminate electric wave harm to constructions such as walls.
With mobile phone and PHS be representative the radio communication machine popularize very soon, also promptly popularize even if sentence the radio communication machine that the form of the wireless data communication network that is referred to as WLAN uses in office, shop, workshop, warehouse etc.In the specific interior space of office etc., use under the situation of such radio communication machine, in order to prevent intrusion from outdoor noise electric wave, or outdoor in order to prevent that indoor information is leaked to, usually to carry out the construction of the radio wave shield that constitutes by metal forming or wire netting, conducting fibre etc. to wall etc.In addition, even if do not carry out the construction of radio wave shield, office in the last few years, the corrugated steel that uses metal to make on ceiling and floor mostly, the dual panel that uses metal to make mostly on the floor, under the most situation, ceiling and floor become the radio wave attenuation environment.In addition, for wall, use steel furniture and building materials under the most situation, the situation that wall becomes the radio wave attenuation environment increases day by day.
But, in such radio wave attenuation environment, electric wave by the communicating machine emission, or by inwall or ceiling, floor, the reflection of steel furniture building materials, the reflected wave that phase place is different arrives the receiving terminal, or reflected wave arrives the receiving terminal multiplely, can not discern as normal signal accepting machine one side, thereby the problem that call duration time too increases or causes communicating takes place.
So, effective countermeasure as the communication harm that causes by these reflected waves, can make the construction of the wave absorber that contains conducting fibre in the built-in material and constitute, for example, open among the flat 10-107479 the Japanese patent gazette spy, disclose the relevant technology of plasterboard with the conducting fibre that contains carbon fiber etc.
But, because the electric wave absorbent properties of the existing plasterboard that contains conducting fibre are insufficient, so the communication that can not suppress effectively to be produced by reflected wave endangers.
So, the object of the present invention is to provide the construction method of good wave absorber of electric wave absorbent properties and built-in material.
The inventor has carried out conscientious research for achieving the above object, found that: in laminated body constituting by the multilayer that contains conducting fibre, under the situation that wall etc. is constructed, the electric wave absorbent properties are improved, can suppress the communication harm that produces by reflected wave effectively.This is considered to be in, and electric wave not only is attenuated in each layer of laminated body, interferes mutually from the reflected wave of each layer, on phase place and relationship of amplitude, cancel each other, in other words, the cause that makes it to decay by means of resonance.The present invention proposes with regard to being based on above-mentioned cognition.
In other words, wave absorber of the present invention is characterised in that: have the layers 1 and 2 at least that contains conducting fibre respectively.
In this wave absorber, incide electric wave on this wave absorber because of in the 1st layer and the 2nd layer of expert and then be attenuated.In addition, be attenuated because of interfering to cancel each other at the reflected wave of the 1st layer of internal reflection with at the reflected wave of the 2nd layer of internal reflection.So, the electric wave absorbent properties that just can improve wave absorber by reflected wave is interfered each other.
In addition, in wave absorber of the present invention, its feature also is: layers 1 and 2 constitutes with inorganic material.Like this, just can improve the fire resistance of wave absorber.
In addition, in wave absorber of the present invention, it is characterized in that: the 1st layer is made of asbestos, and the 2nd layer is made of gypsum.Like this, just can realize the improvement of sound absorption properties and the improvement of artistic conception to help the 1st layer of asbestos one side.In addition, because gypsum and other inorganic material weight/power ratio are light, so the operation can use the 2nd layer of realization of gypsum one side that this wave absorber is constructed the time.
In addition, in wave absorber of the present invention, its feature also can be: layers 1 and 2 is made of asbestos.Like this, just can realize the improvement of sound absorption properties and the improvement of artistic conception to help the asbestos of layers 1 and 2.In this case, preferably make the content difference of conducting fibre in the layers 1 and 2.
In addition, in wave absorber of the present invention, conducting fibre is a carbon fiber, and preferably this conducting fibre content is 0.005～0.3g/l in the 1st layer, and this conducting fibre content is 0.1～1.0g/l in the 2nd layer.Like this, then wave absorber has high electric wave absorbent properties.
In addition, in wave absorber of the present invention, preferably the 1st layer thickness is 1～30mm, and the 2nd layer thickness is 1～30mm.Under the 1st layer the situation of thickness less than 1mm, the dispersion effect with conducting fibre degenerates, and unlikelyly obtains the tendency that the electric wave absorbent properties are improved effect.Under the 1st layer the situation of thickness greater than 30mm, then having the weight that causes wave absorber increases, not only impracticable but also can not expect that further electric wave absorbent properties improve the tendency of effect.Under the 2nd layer the situation of thickness less than 1mm, the dispersion effect with conducting fibre degenerates, and unlikelyly obtains the tendency that the electric wave absorbent properties are improved effect.Under the 1st layer the situation of thickness greater than 30mm, then having the weight that causes wave absorber increases, not only impracticable but also can not expect that further electric wave absorbent properties improve the tendency of effect.
In addition, in wave absorber of the present invention, its feature also can be: the 1st layer is made of inorganic material, and the 2nd layer is made of organic material.Like this, because the 1st layer be made of inorganic material, so when can improve fire resistance, constitute by organic material owing to the 2nd layer, so can also alleviate the weight of wave absorber.
In addition, in wave absorber of the present invention, its feature also can be: the 1st layer is made of asbestos, and the 2nd layer with the organic system applying coating that contains conducting fibre is constituted to the way on above-mentioned the 1st layer.Like this, just can improve sound absorption properties, improve artistic conception with the 1st layer of asbestos one side.In addition, only use way, just can easily form the 2nd layer the 1st layer of coating organic system coating.
In addition, in wave absorber of the present invention, conducting fibre is a carbon fiber, preferably this conducting fibre content is 0.2～0.5g/l in the 1st layer, in the 2nd layer, the total amount 100 weight % with respect to the 2nd layer, this conducting fibre content is 10～25 weight %.Like this, then wave absorber has high electric wave absorbent properties.
In addition, in wave absorber of the present invention, preferably the 1st layer thickness is 1～30mm, and the coating amount that constitutes the 2nd layer organic system coating is 100～3000g/m
2Under the 1st layer the situation of thickness less than 1mm, the dispersion effect with conducting fibre degenerates, the unlikely tendency that obtains the effect of electric wave absorbent properties improvement.Under the 1st layer the situation of thickness greater than 30mm, then have the weight that causes wave absorber and strengthen, not only impracticable but also can not expect the tendency of effect of the improvement of further electric wave absorbent properties.Constituting the 2nd layer the coating amount of organic system coating less than 100g/m
2Situation under, the dispersion effect with conducting fibre degenerates, the unlikely tendency that obtains the effect that the electric wave absorbent properties improve.Constituting the 2nd layer the coating amount of organic system coating greater than 3000g/m
2Situation under, then have the weight that causes wave absorber and strengthen, not only impracticable but also can not expect the tendency of effect of the improvement of further electric wave absorbent properties.
In wave absorber of the present invention, its feature also is: the fibre length of conducting fibre is 0.1～30mm.This is because under the situation of fibre length less than 0.1mm of conducting fibre, conducting fibre just works as dielectric, be difficult to obtain produce the dielectric loss effect of the dielectric loss of electric wave, unlikelyly obtain the cause that the electric wave absorbent properties are improved effect, in addition, under the situation of fibre length,, unlikelyly obtain the cause that the electric wave absorbent properties are improved effect then because the dispersion effect of conducting fibre degenerates greater than 30mm.
In addition, the construction method of built-in material of the present invention is characterized in that: be after substrate is constructed with the plasterboard that contains conducting fibre, stack one deck contains the asbestos board of conducting fibre on this plasterboard.
If adopt the construction method of this built-in material, because stack one deck asbestos board on plasterboard, so the electric wave that incides on the built-in material will be by means of in asbestos board and plasterboard expert and then be attenuated.In addition, reflected wave that reflects in asbestos board and the reflected wave that reflects in plasterboard are then cancelled out each other and are attenuated by means of interfering.So, adopt the way that reflected wave is interfered to each other, just can improve the electric wave absorbent properties of built-in material.In addition, adopt plasterboard is used as substrate, the way that the asbestos board that superposes is above that constructed just can improve the artistic conception in the space that built-in material is constructed.
Show to the profile signal property of Fig. 1 the structure of the wave absorber of embodiment 1,2.
The schematic diagram of Fig. 2 is used for illustrating the assay method of the reflection loss among the embodiment.
The schematic diagram of Fig. 3 has illustrated the appearance of the radio wave attenuation on the ceiling.
The schematic diagram of Fig. 4 is used for illustrating the assay method of the reflection loss among the embodiment.
Below, referring to description of drawings embodiment of the present invention.In addition, also the repetitive description thereof will be omitted to give same label for same key element.
Show to the profile signal property of Fig. 1 the structure of the wave absorber of embodiment 1.As shown in the figure, the wave absorber 10 of the present embodiment has the 1st layer 14 and the 2nd layers 16 that contain conducting fibre 12 respectively.Constitute by inorganic material for the 1st layer 14 and the 2nd layers 16, improved fire resistance.These the 1st layer 14 and the 2nd layers 16, engage with bonding agent etc.
In this manual, so-called ' inorganic material ', referring to nonmetal composition is the inorganic material of main component, does not only comprise the material that the metal material of the metallic composite that by the metal monomer, only contains multiple metal or alloy and so on constitutes in fact.As inorganic material, except that gypsum, lime, calcium silicates, various cement, for example can enumerate asbestos, silica-gel sphere (シ ラ ス バ Le-Application), glass fibre, glass fiber, pearlite, aluminium hydroxide, セ PVC オ ラ イ ト, ア パ Le ジ ヤ イ ト etc.
Though constitute the 1st layer 14 and the 2nd layers 16 inorganic material, both can be that commaterial also can be different material, constitute the 1st layer 14 with asbestos, it is preferred constituting the 2nd layer 16 with gypsum.Like this, for example adopt gypsum one side the 2nd layer 16 to use overleaf, the 1st layer 14 of asbestos one side is used as surperficial way, just can improve the artistic conception of the interior space that this wave absorber is constructed as substrate.In addition, can also improve sound absorption properties by means of the 1st layer 14 of asbestos one side.In addition since with other inorganic material ratio, the gypsum that constitutes the 2nd layer 16 is in light weight, so when carrying out the construction of wave absorber 10, can improve operation.
In the wave absorber 10 of the present embodiment, preferably, the 1st layer 14 thickness is 1～30mm, and the 2nd layer 16 thickness is 1～30mm.Under the 1st layer 14 the situation of thickness less than 1mm, the dispersion effect with conducting fibre degenerates, and is difficult to improve the absorbefacient tendency of electric wave.If, then having the weight that causes wave absorber greater than 30mm, the 1st layer thickness increases, not only impracticable but also can not expect further to improve the tendency of the effect of electric wave absorbent properties.If the 2nd layer thickness is less than 1mm, the dispersion effect with conducting fibre degenerates, and is difficult to improve the tendency of electric wave absorbent properties.If, then having the weight that causes wave absorber greater than 30mm, the 1st layer thickness increases, not only impracticable but also can not expect the tendency that further electric wave absorbent properties are improved.
As the conducting fibre 12 that in the 1st layer 14 and the 2nd layers 16, all contains,, have no particular limits so long as it is just passable to have a fiber of conductivity.For example, can enumerate carbon fiber, copper fiber, aluminum fiber or the like.From lightweight viewpoint, as conducting fibre carbon fiber particularly preferably.As carbon fiber, it is all right using pitch system or PAN, and for example, can enumerate with coal tar asphalt, petroleum asphalt, coal liquefaction thing, polyacrylonitrile, cellulose is the carbon fiber of raw material.
Here, the fibre length of conducting fibre 12, preferably 0.1～30mm, particularly preferably 2～6mm.This is because under the situation of fibre length less than 0.1mm of conducting fibre, conducting fibre just works as dielectric, be difficult to obtain produce the dielectric loss effect of the dielectric loss of electric wave, the unlikely cause of improving effect that obtains the electric wave absorbent properties, in addition, under the situation of fibre length, then because the dispersion effect of conducting fibre degenerates the unlikely cause of improving effect that obtains the electric wave absorbent properties greater than 30mm.
In addition, the content of conducting fibre 12, adopt in the wave absorber 10 of carbon fiber at conducting fibre 12, preferably these conducting fibre 12 content are 0.005～0.3g/l in the 1st layer 14, and these conducting fibre 12 content are 0.1～1.0g/l in the 2nd layer 16.Like this, the situation ratio with constitute wave absorber separately with plasterboard can improve the electric wave absorbent properties.
Particularly in the 1st layer 14, contain this conducting fibre 12 0.05～0.1g/l, in the 2nd layer 16, contain under the situation of this conducting fibre 12 0.2～1.0g/l, can further improve the electric wave absorbent properties of wave absorber 10, for example, can be prevented the TV ghost image or prevent boats and ships electric wave ghost image necessary-14dB about above electric wave absorbent properties.
Such wave absorber 10, though be the 1st layer 14 and the 2nd layers 16 that constitute separately, locate to be bonded together formation at the workshop etc. with bonding agent, but in general, independent the 1st layer 14 and the 2nd layers 16 of constituting are carried to the scene separately, are layered on the wave absorber that the 2nd layer 16 following superimposed layer constitutes the present embodiment to the 1st layer 14.
Secondly, the effect to the wave absorber of the said the present embodiment in top describes.
In the wave absorber 10 of the present embodiment, it is such that the conducting fibre 12 that comprises in the 1st layer 14 and the 2nd layers 16 plays a part capacitor, by the electric wave that incides on the wave absorber 10 is advanced in the 1st layer 14 and the 2nd layers 16, be transformed into electric current earlier and be transformed into heat again, decay.In addition, seeing through the 1st layer of 14 electric wave that arrives the 2nd layer 16 is reflected by means of the impedance difference of each layer in phase lag.So, when reflected wave that is reflected in the 1st layer 14 and the reflected wave that is reflected in the 2nd layer become to the mutually different condition of phase place (by the relation decision of the frequency of the thickness of the dielectric coefficient of each layer and dielectric loss, each layer, electric wave), cancel out each other because of interference and to decay.So, because electric wave is not only by means of the 1st layer 14 and the 2nd layers 16 expert and then decay, also by means of the reflected wave in the 1st layer 14 and the 2nd layers 16 to each other interference and decay, so the volume reflection of electric wave reduces, comprise the decay that causes by this interference simultaneously, in a broad sense, can improve the electric wave absorbent properties of wave absorber.Therefore, adopt the way of the content of adjusting conducting fibre 12, just can improve the electric wave absorbent properties further.
To be said to be the 5GHz frequency band of next generation wireless lan and the WLAN of 19GHz frequency band further if use, people say can (this be that a kind of a transmissions side and reception one side can be looked at straight by means of direct-view communication, the communication form of the position relation that can straight line ground arrives of electric wave in other words, and the sort ofly exist hazardous material sending a side and receive between the side, so the non-direct-view communication difference of the form that will communicate) communicates by means of ceiling or floor make it reflection wave.Therefore, adopt, just can remove unwanted reflected wave, improve communication speed and the reliability of communicating by letter in the indoor way that the good wave absorber 10 of this electric wave absorbent properties is constructed.In follow-on LAN, though as the electric wave absorbent properties require-10～-reflection loss about 20dB,, if, also can realize such electric wave absorbent properties with the wave absorber 10 of the present embodiment.
In addition, in order to prevent TV ghost image or boats and ships electric wave ghost image, as the electric wave absorbent properties, though more than the requirement-10dB, preferably, requirement-14dB～-reflection loss about 20dB, but, also can realize such electric wave absorbent properties if use the wave absorber of the present embodiment.
In addition, though in the present embodiment explanation be the situation of the 1st layer of 14 different inorganic material formations with the 2nd layer of 16 usefulness, also can use same inorganic material, for example constitute the 1st layer 14 and the 2nd layers 16 with asbestos.At this moment, preferably between the 1st layer 14 and the 2nd layers 16, make the content difference of conducting fibre 12.Such wave absorber 10, both can be bonded together formation with the 1st layer 14 and the 2nd layers 16 that handles such as bonding agent constitute separately, also can be in order get up to constitute the 1st layer of 14 and the 2nd layers of 16 lamination, the system of the copying stage at asbestos of making makes the content difference of conducting fibre.In addition, actually under the situation that such wave absorber 10 is constructed, make the low side of content of conducting fibre 12, the side that the permeability of electric wave is high is a surperficial side in other words, make the high side of content of conducting fibre 12, the side that the reflectivity of electric wave is high is that the back side one side is used in other words, is preferred.
In addition, in the present embodiment, though explanation is the wave absorber of the 1st layer 14 and the 2nd layers 16 double-layer structural, wave absorber can also have other layer and no matter whether contain conducting fibre.
Secondly, the embodiment 2 to wave absorber of the present invention describes.
The wave absorber 10 of the present embodiment, the same with the wave absorber of embodiment 1, as shown in Figure 1, have the 1st layer 14 and the 2nd layers 16 that contain conducting fibre 12 respectively.Be made of inorganic material for the 1st layer 14, the 2nd layer 16 are made of organic material.Like this,, just can realize the lightweight of wave absorber 10, the operation when improving construction by constitute the 2nd layer 16 with organic material.
As the inorganic material that constitutes the 1st layer 14, can use the inorganic material the same here, with the said embodiment in top 1.
In addition, as the organic material that constitutes the 2nd layer, for example can enumerate vinyl, ester resin, allyl resin, urethane resin, styrene resin, phenolic resin, acetate resin, melamine resin, ethene acetate propylene (ethylene vinyl acryl) resin, epoxy resin, synthetic rubber and their expanded material.
As mentioned above, though can use above said those materials as inorganic material and organic material, but preferably the 1st layer 14 is made of asbestos, and the 2nd layer of 16 usefulness constitute the organic system applying coating that contains conducting fibre 12 to the way on above-mentioned the 1st layer 14.Like this, by the 2nd layer 16 of organic system coating one side used overleaf as substrate,, just can improve the artistic conception of the interior space that this wave absorber 10 is constructed the 1st layer of 14 way that is used as the surface of asbestos one side.In addition, can also improve sound absorption properties by means of the 1st layer 14 of asbestos one side.In addition, only by on 1 layer 14 of the organic system applying coating to the, just can easily on the 1st layer 14, form the 2nd layer 16.As this organic system coating, can use the coating of vinyl acetate system, specifically, can use polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal etc.
Here, in the wave absorber 10 of the present embodiment, preferably the 1st layer thickness is 1～30mm, and the coating amount that constitutes the 2nd layer organic system coating is 100～3000g/m
2Under the 1st layer the situation of thickness less than 1mm, the dispersion effect with conducting fibre degenerates, and is difficult to obtain the tendency that the electric wave absorbent properties are improved effect.Under the 1st layer the situation of thickness greater than 30mm, then having the weight that causes wave absorber increases, not only impracticable but also can not expect the tendency that further electric wave absorbent properties are improved.Constituting the 2nd layer the coating amount of organic system coating less than 100g/m
2Situation under, the dispersion effect with conducting fibre degenerates, and is difficult to obtain the tendency that the electric wave absorbent properties are improved effect.Constituting the 2nd layer the coating amount of organic system coating greater than 3000g/m
2Situation under, then having the weight that causes wave absorber increases, not only impracticable but also can not expect that further electric wave absorbent properties improve the tendency of effect.
As the conducting fibre 12 that in the 1st layer 14 and the 2nd layers 16, all contains,, have no particular limits so long as it is just passable to have a fiber of conductivity.For example, can enumerate carbon fiber, copper fiber, aluminum fiber or the like.From lightweight viewpoint, particularly preferably be carbon fiber as conducting fibre.
Here, the fibre length of conducting fibre 12, the same with the wave absorber of embodiment 1,0.1～30mm preferably, particularly preferably being the fibre length that is contained in the conducting fibre 12 in the 1st layer 14 is 2～6mm, and the fibre length of contained conducting fibre 12 is 0.2～2mm in the 2nd layer 16.This is because under the situation of fibre length less than 0.1mm of conducting fibre 12, conducting fibre 12 works as dielectric, be difficult to obtain produce the dielectric loss effect of the dielectric loss of electric wave, unlikelyly obtain the cause that the electric wave absorbent properties are improved effect, in addition, under the situation of fibre length greater than 30mm, then because the dispersion effect of conducting fibre 12 degenerates, the unlikely cause that obtains the effect of electric wave absorbent properties improvement.
In addition, the content of conducting fibre 12, using in the wave absorber 10 of carbon fiber as conducting fibre 12, preferably conducting fibre 12 content are 0.2～0.5g/l in the 1st layer 14, in the 2nd layer 16, total amount 100 weight % with respect to the 2nd layer, conducting fibre 12 content are 10～25 weight %.Like this, the situation ratio with independent use organic system coating formation wave absorber can improve the electric wave absorbent properties.
Particularly, in the 1st layer 14, contain conducting fibre 12 0.25～0.35g/l, in the 2nd layer 16, total amount 100 weight % with respect to the 2nd layer contain under the situation of conducting fibre 12 18～23 weight %, the electric wave absorbent properties of wave absorber can further improve, can for example be prevented the TV ghost image and prevent boats and ships electric wave ghost image necessary-14dB about above electric wave absorbent properties.
Secondly, the action effect to the wave absorber of the said the present embodiment in top describes.
In the wave absorber 10 of the present embodiment, it is such that the conducting fibre 12 that contains in the 1st layer 14 and the 2nd layers 16 plays a part capacitor, the same with the wave absorber of embodiment 1, advance in the 1st layer 14 and the 2nd layers 16 by making the electric wave that incides on the wave absorber 10, be transformed into electric current earlier and be transformed into heat again, decay.In addition, see through the 1st layer 14 and arrive the 2nd layer 16 electric wave and in phase lag, be reflected by means of the difference of the impedance of each layer.So, when reflected wave that is reflected in the 1st layer 14 and the reflected wave that is reflected in the 2nd layer become to the mutually different condition of phase place (by the relation decision of the frequency of the thickness of the dielectric coefficient of each layer and dielectric loss, each layer, electric wave), cancel out each other because of interference and to decay.So, because electric wave is not only by means of the 1st layer 14 and the 2nd layers 16 expert and then decay, also by means of the reflected wave in the 1st layer 14 and the 2nd layers 16 to each other interference and decay, so the volume reflection of electric wave reduces, comprise the decay that causes by this interference simultaneously, in a broad sense, can improve the electric wave absorbent properties of wave absorber.Therefore, can improve the electric wave absorbent properties further.
Particularly adopt the way of the content of adjusting above-mentioned conducting fibre 12, can realize the further raising of electric wave absorbent properties.
The wave absorber 10 of the present embodiment for example is being used as under the situation of ceiling, can easily construct with T steel bar lift-on/lift-off system.
In addition, though explanation in the present embodiment is the wave absorber 10 of the 1st layer 14 and the 2nd layers 16 double-layer structural, also can have other layer, no matter whether wave absorber contains conducting fibre.
Secondly, an embodiment to the construction method of built-in material of the present invention describes.
The construction method of the built-in material of the present embodiment is characterised in that: be after substrate is constructed with the plasterboard that contains conducting fibre, containing the asbestos board of conducting fibre to this plasterboard stack one deck.
As the conducting fibre that plasterboard and asbestos board contained,, have no particular limits so long as it is just passable to have a fiber of conductivity.For example, can enumerate carbon fiber, copper fiber, aluminum fiber or the like.From lightweight viewpoint, particularly preferably be carbon fiber as conducting fibre.As carbon fiber, it is all right using pitch system or PAN, and for example, can enumerate with coal tar asphalt, petroleum asphalt, coal liquefaction thing, polyacrylonitrile, cellulose is the carbon fiber of raw material.
Now, the construction method when being applied to the construction method of the built-in material of the present embodiment in the ceiling construction describes.
At first,, the steel of C channel-section steel and M steel bar etc. are fixed on this screw rod, are combined into intersecting parallels, make the reinforcing bar substrate from the ceiling next screw rod of hanging oneself.Secondly, the plasterboard that contains conducting fibre in the reinforcing bar substrate is carried out the plane that screw forms level.Then, use bonding agent and filler simultaneously, the asbestos board stickup that contains conducting fibre is fixed on the lower surface of plasterboard.
If adopt the construction method of this built-in material, because it is such that the conducting fibre that contains in asbestos board and the plasterboard plays a part capacitor, advance in asbestos board and plasterboard by making the electric wave on the laminated body that incides asbestos board and plasterboard, be transformed into electric current earlier and be transformed into heat again, decay.In addition, seeing through electric wave that asbestos board arrives plasterboard is reflected by means of the difference of the impedance of each layer in phase lag.So, when reflected wave that is reflected in asbestos board and the reflected wave that is reflected in plasterboard become to the mutually different condition of phase place (by the relation decision of the frequency of the thickness of the dielectric coefficient of each layer and dielectric loss, each layer, electric wave), decay because of interfering to cancel out each other.So, because electric wave is not only by means of the expert and then decay at asbestos board and plasterboard, also by means of the reflected wave in asbestos board and plasterboard to each other interference and decay, so the volume reflection of electric wave reduces, comprise the decay that causes by this interference simultaneously, in a broad sense, can improve the electric wave absorbent properties of wave absorber.Therefore, can suppress effectively to endanger by the communication of reflected wave generation.In addition, owing to be after substrate is constructed with the plasterboard, the stack asbestos board so asbestos board one side displays from the teeth outwards, thereby can improve the artistic conception of construction space.
Below, with embodiment, comparative example wave absorber of the present invention is described more specifically, but the present invention is not subject to these embodiment.
Embodiment
(materials used)
Wave absorber A
Constitute the 1st layer 14 with asbestos, constitute the 2nd layer 16 with gypsum.Making the 1st layer 14 thickness is 12mm, and the thickness that makes the 2nd layer 16 is 9mm.In addition, use the carbon fiber of fibre length as conducting fibre 12 as 6mm.In addition, wave absorber A is made to become the plate body of long 40cm * wide 40cm.
Wave absorber B
Wave absorber B is the 12mm except making the 2nd layer 16 thickness, and is identical with the formation of wave absorber A.
Wave absorber C
The formation that constitutes the 1st layer 14, the 2 layers 16 with asbestos is: as organic system coating, polyvinyl acetate (PVAc) is coated on the 1st layer 14 the whole surface of single face.Making the 1st layer 14 thickness is 12mm, and making the coating amount of the polyvinyl acetate that constitutes the 2nd layer 16 is 625g/m
2In addition, use the carbon fiber of fibre length, use the carbon fiber of fibre length as 0.7mm as the conducting fibre 12 that contains in the 2nd layer 16 of the opposing party as 6mm as the conducting fibre 12 that contains in the 1st layer 14.In addition, wave absorber C is made the plate body of growth 40cm * wide 40cm.
(electric wave absorbent properties assay method)
(1) reflection loss
In the present embodiment, main is the electric wave absorbent properties that index is estimated wave absorber with the reflection loss.So-called here reflection loss, the metallic plate of expression and 100% reflection wave has relatively carried out the decay of much degree from the reflected wave of sample.
Electric wave is the orthogonal ripple in electric field and magnetic field, and the unit in electric field and magnetic field is respectively [V/m] and [A/m].Its unit is [W] under as the situation of delivering power.Reflection loss has reflection loss of trying to achieve from electric field and the reflection loss of trying to achieve from delivering power.Below, provide the method for asking of reflection loss.
As shown in Figure 2, the electric wave of launching by transmitting antenna 21 with incidence angle (θ 1) to metallic plate (sample) incident that is placed on the position of just in time leaving a certain constant distance (D1), just in time leave under the situation of reception antenna 23 of position of a certain constant distance (D2) arriving being placed on of reflecting with angle of reflection (θ 2), shown in Fig. 2 (a), as to establish the electric field strength that is arrived the electric wave of reception antennas 23 by metallic plate 25 reflection be E0, if energy is P0, shown in Fig. 2 (b), if being arrived the electric field strength of reception antenna 23 by sample 27 reflections is E1, energy is P1, and then reflection loss S can try to achieve from following formula.
S[dB]=-10logP0/P1)
=-20log(E0/E1)
Otherwise the decay of energy can be tried to achieve from following formula.
P1/P0=exp(S/10)
Wherein, when measuring reflection loss, because electric wave has the character with concentric spherical expansion, under the short situation of antenna, electric field strength changes significantly along with the variation of distance, so the distance (L) that must leave between transmitting antenna 21 and the sample 27 is measured (remote boundaries mensuration).This distance (L) can be with the length (D) on the long limit of the wavelength (λ) of the electric wave that will measure and antenna square aperture size, calculates according to following formula and try to achieve.
L=2D
2/λ
Because the wavelength X of electric wave be 12cm under 2.5GHz, the length D on the long limit of the antenna square aperture of two reinforcing box horns 3115 of EMCO company production is 24.5cm, becomes and is 1.0m so can be regarded as the distance L of remote boundaries.In the present embodiment, than longer 1.2m as the distance between antenna and the sample.
Thus, be 1[W at the energy P0 of the electric wave that is for example reflected by metallic plate 25] condition under, be 0.3[W from the energy P1 of the reflected wave of sample 27] situation under reflection loss will become for:
S=-10log(1/0.3)=-5.2[dB]
In addition, have-5[dB] the situation of sample 27 of reflection loss under, from the decay of the energy of the reflected wave of sample 27, will become for
P1/P0=exp(-5/10)=0.32
The result becomes, for the energy attenuation to 32% from the reflected wave of metallic plate 25.
Reflection loss condition determination in the present embodiment is in addition, and the frequency of electric wave is decided to be 2.45GHz, and the distance D 2 between the distance D 1 between transmitting antenna 21 and the metallic plate 25 (sample 27) and reception antenna 23 and the metallic plate 25 (sample 27) all is decided to be 1.2m.In addition, the incidence angle θ 1 of electric wave and angle of reflection θ 2 are decided to be 20 degree.
(2) transmission loss
In the present embodiment, be that index is estimated wave absorber and whether is suitable for site operation in the reality with top said reflection loss and transmission loss.So-called here transmission loss is that the expression electric wave sees through the loss that ripple has carried out the decay of much degree when seeing through sample.
As shown in Figure 3, for example under the situation that the reflection of considering the electric wave relevant with the ceiling in the office environment in reality is illustrated, the electric wave of 33 emissions from transmitter 31 towards ceiling, can consider 2 kinds of paths (route): the path (route I) that is turned back to receiver 37 after ceiling 33 reflections, with see through ceiling 33 backs by corrugated steel 35 reflections (100%), see through the path (route II) that ceiling 33 arrives receivers 37 again.
Here, under the situation of the reflection of originally wanting to reduce the electric wave that forms by ceiling 33, in order to reduce volume reflection at ceiling 33 places, just need to reduce the amount of the conducting fibre that contains in ceiling 33, but, when reducing the content of conducting fibre, the transmission loss that is produced by ceiling also will reduce.Therefore, if reduce the content of conducting fibre, though the volume reflection of electric wave will reduce,, conversely, the amount of the electric wave that sees through increases, because of being reflected this side of route II who returns by corrugated steel 35, the intensity increase of electric wave.So, can not reduce the reflection of the electric wave that produces by ceiling 33.Therefore, the receiving intensity that just must obtain in advance at the reflected wave at route II place becomes than the also big condition of reflection intensity of wave at route I place.This condition can be represented (omitting the details of deriving) with the reflection loss and the transmission loss of ceiling 33.
(transmission loss) * 2 〉=(reflection loss)
Owing to satisfying under the situation of this condition, the permeability of ceiling 33 is excessive, is not suitable for actual site operation so can be judged as such wave absorber as ceiling 33.Like this, just can whether be suitable for actual site operation according to above-mentioned condition evaluating wave absorber.
Below, provide the method for asking of transmission loss.
Concerning transmission loss,, owing to become complicated with refraction effect, so in the present embodiment, be assumed to be the situation of vertical incidence under the situation of oblique incidence though vertical incidence and two kinds of situations of oblique incidence are arranged.
In addition, in the assay method of transmission loss, though there is use on the surface of sample, transmitting antenna to be set, the structure that reception antenna is set overleaf carries out method for measuring (near the boundary estimation that utilizes A Defan (ア De バ Application) method of testing to carry out), but, local said as at above-mentioned reflection loss, owing to preferably measure, so measure in that transmitting antenna and reception antenna are left under the state that just in time is counted as remote boundaries at the stable remote boundaries place of intensity change of electric wave for distance.The antenna distance that can regard remote boundaries as, local said as at above-mentioned reflection loss is decided to be 1.2m.
As concrete assay method, at first, shown in Fig. 4 (a), make transmitting antenna 41 and reception antenna 43 under the state that just in time leaves a distance D 3=1.2m, face one another face ground and send electric wave, measure the electric wave energy P0 and the electric field E0 that arrive reception antenna 43 at this moment.Secondly, shown in Fig. 4 (b),, sample 45 is set, measures the energy P1 and the electric field E1 of the electric wave that arrives reception antenna 43 in the front of reception antenna 43.Then, can ask transmission loss by following formula.
T=-10log(P0/P1)
For example, be 0.2[W at P0], P1 is 0.3[W] situation under, transmission loss T will become:
T=-10LOG(0.2/0.3)=-8.23[dB]
[embodiment 1]
In embodiment 1, to wave absorber A, make the amount of the carbon fiber (CF) in the asbestos that constitute the 1st layer 14, between 0.005～0.4g/l, change, the amount of the carbon fiber (CF) in the gypsum that constitutes the 2nd layer 16 is changed between 0.1～2g/l, measure electric wave absorbent properties in this case.
[embodiment 2]
In embodiment 2, to wave absorber B, make the amount of the carbon fiber (CF) in the asbestos that constitute the 1st layer 14, between 0.005～0.4g/l, change, the amount of the carbon fiber (CF) in the gypsum that constitutes the 2nd layer 16 is changed between 0.1～1.5g/l, measure electric wave absorbent properties in this case.
[embodiment 3]
In embodiment 3, to wave absorber C, make the amount of the carbon fiber (CF) in the asbestos that constitute the 1st layer 14, between 0.005～0.3g/l, change, the amount of the carbon fiber (CF) in the polyvinyl acetate 100g that constitutes the 2nd layer 16 is changed between 0.5～30g/l, measure electric wave absorbent properties in this case.
[comparative example 1]
In comparative example 1, as comparison to the wave absorber A of embodiment 1, to thickness is the asbestos board of 12mm, measures the electric wave absorbent properties of with asbestos board separately carrying out of amount under situation about changing between 0.005～0.4g/l make the carbon fiber (CF) in the asbestos board.In addition, be the plasterboard of 9mm to thickness, measure the independent electric wave absorbent properties of the plasterboard of amount under situation about changing between 0.1～2g/l that make the carbon fiber (CF) in the gypsum.
[comparative example 2]
In comparative example 2, as comparison to the wave absorber B of embodiment 2, to thickness is the asbestos board of 12mm, measures the electric wave absorbent properties of with asbestos board separately carrying out of amount under situation about changing between 0.005～0.4g/l make the carbon fiber (CF) in the asbestos board.In addition, be the plasterboard of 12mm to thickness, measure the independent electric wave absorbent properties of the plasterboard of amount under situation about changing between 0.1～1.5g/l that make the carbon fiber (CF) in the gypsum.
[comparative example 3]
In comparative example 3, as comparison to the wave absorber C of embodiment 3, to thickness is the asbestos board of 12mm, measures the electric wave absorbent properties of with asbestos board separately carrying out of amount under situation about changing between 0.005～0.4g/l make the carbon fiber (CF) in the asbestos board.In addition, to being 625g/m with the coating amount
2To not conforming to the thickness that conducting fibre is arranged is that the plasterboard of 12mm applies the polyvinyl acetate that constitutes, and measures the electric wave absorbent properties of amount under situation about changing between 0.5～30g/l that make the carbon fiber (CF) in the polyvinyl acetate 100g.
The resulting table 1 that the results are shown in embodiment 1 and comparative example 1.
[table 1]
*RW12mm, gypsum 9mm
As shown in table 1, in this wave absorber A, obtained than obtaining the also high reflection loss of reflection loss separately with plasterboard, the electric wave absorbent properties improve.Particularly the carbon fiber (CF) in being contained in asbestos board (RW) is 0.005～0.3g/l, and the carbon fiber (CF) that is contained in the plasterboard is under the situation of 0.1～1.0g/l, has to obtain-and the tendency of high electric wave absorbent properties about 8dB.In addition, the carbon fiber (CF) that includes at asbestos board (RW) is 0.05～0.1g/l, and the carbon fiber (CF) that is contained in the plasterboard is under the situation of 0.2～1.0g/l, the electric wave absorbent properties of wave absorber can further be improved, for example can be prevented the TV ghost image or prevent boats and ships electric wave ghost image necessary-the above electric wave absorbent properties of the sort of degree of 14dB.
In addition, in the wave absorber of the amount of carbon fiber shown in the table 1, can confirm: all satisfy the condition of top said (transmission loss) * 2 〉=(reflection loss) in all cases, be suitable for actual site operation.
Secondly, resulting result in embodiment 2 and comparative example 2 has been shown in table 2.
[table 2]
*RW12mm, gypsum 12mm
As shown in table 2, in this wave absorber B, also obtained than obtaining the also high reflection loss of reflection loss separately with plasterboard, the electric wave absorbent properties improve.Particularly the carbon fiber (CF) in being contained in asbestos board (RW) is 0.005～0.3g/l, and the carbon fiber (CF) that is contained in the plasterboard is under the situation of 0.1～1.0g/l, has to obtain-and the tendency of high electric wave absorbent properties about 8dB.In addition, carbon fiber (CF) in being contained in asbestos board (RW) is 0.05～0.1g/l, and the carbon fiber (CF) that is contained in the plasterboard is under the situation of 0.1～0.5g/l, the electric wave absorbent properties of wave absorber can further be improved, for example can be prevented the TV ghost image or prevent boats and ships electric wave ghost image necessary-the above electric wave absorbent properties of the sort of degree of 14dB.
In addition, in the wave absorber of the amount of carbon fiber shown in the table 2, can confirm: all satisfy the condition of top said (transmission loss) * 2 〉=(reflection loss) in all cases, be suitable for actual site operation.
Secondly, resulting result in embodiment 3 and comparative example 3 has been shown in table 3.
[table 3]
| CF (g/l) in the RW | ||||||||||||
| ?????0 | ????0.005 | ????0.01 | ????0.05 | ?????0.1 | ?????0.2 | ?????0.3 | ?????0.4 | ?????0.5 | ?????1.0 | ?????3.0 | ||
| Polyvinyl acetate, CF (100g), (g) | ????0.1 | ????-17 | ????-14.5 | ????-13.3 | ????-9.6 | ????-7.8 | ????-5.7 | ????-4.5 | ????-3.8 | ????-3.5 | ????-3.3 | ????-3.1 |
| ????0.5 | ????-12 | ????-11.1 | ????-10.8 | ????-8.5 | ????-7.2 | ????-5.4 | ????-4.6 | ????-4.3 | ????-3.8 | ????-3.5 | ????-3.3 | |
| ????1.2 | ????-11 | ????-10.3 | ????-9.9 | ????-8.2 | ????-7.1 | ????-5.3 | ????-4.6 | ????-4.4 | ????-4.3 | ????-3.8 | ????-3.5 | |
| ????5.0 | ????-5 | ????-6.2 | ????-6.1 | ????-6.3 | ????-6.1 | ????-6.1 | ????-5.9 | ????-5.7 | ????-4.7 | ????-4.3 | ????-3.8 | |
| ????10 | ????-2 | ????-3.5 | ????-3.6 | ????-4.6 | ????-4.8 | ????-8.0 | ????-8.3 | ????-8.2 | ????-8.1 | ????-5.7 | ????-4.4 | |
| ????20 | ????-1.7 | ????-1.7 | ????-2.1 | ????-3.2 | ????-4.6 | ????-14.0 | ????-16.1 | ????-10.1 | ????-8.4 | ????-5.9 | ????-5.1 | |
| ????25 | ????-1.4 | ????-1.5 | ????-1.8 | ????-2.3 | ????-4.4 | ????-10.0 | ????-13.0 | ????-9.0 | ????-8.0 | ????-5.6 | ????-5.0 | |
| ????30 | ????-1.1 | ????-1.3 | ????-1.5 | ????-1.9 | ????-4.1 | ????-5.0 | ????-6.0 | ????-5.8 | ????-5.2 | ????-5.1 | ????-4.2 | |
*RW12mm, polyvinyl acetate 625g/cm
2
As shown in table 3, in this wave absorber C, also obtained than obtaining the also high reflection loss of reflection loss separately with plasterboard, the electric wave absorbent properties improve.Particularly the carbon fiber (CF) in being contained in asbestos board (RW) is 0.2～0.5g/l, and carbon fiber (CF) amount that is contained in the 100g polyvinyl acetate is under the situation of 10～25g, has to obtain-and the tendency of high electric wave absorbent properties about 8dB.In addition, carbon fiber (CF) in being contained in asbestos board (RW) is 0.25～0.35g/l, and carbon fiber (CF) amount that is contained in the 100g polyvinyl acetate is under the situation of 18～23g, the electric wave absorbent properties of wave absorber can further be improved, for example can be prevented the TV ghost image or prevent boats and ships electric wave ghost image necessary-the above electric wave absorbent properties of the sort of degree of 14dB.
In addition, in table 3, in the little zone of CF concentration, obtained high reflection loss, this is because this zone C F concentration is low terrifically, electric wave sees through and unreflecting cause, in the wave absorber of such CF concentration, can not satisfy the condition of top said (transmission loss) * 2 〉=(reflection loss) because permeability is excessive, so be inapplicable to the site operation of reality.
If adopt wave absorber of the present invention, owing to have the layers 1 and 2 at least that contains conducting fibre respectively, so the electric wave of going into to shine is not only by means of in the 1st layer and the 2nd layer of expert and then decay, also by means of interfering to each other from the reflected wave of each layer and decaying.Therefore, the volume reflection that can reduce electric wave is realized the improvement of the electric wave absorbent properties of wave absorber.
In addition, if adopt the construction method of built-in material of the present invention, owing to contain the asbestos board of conducting fibre at the plasterboard superimposed layer that contains conducting fibre, so incide with the electric wave on the built-in material of this construction method construction, not only by means of in plasterboard and asbestos board is expert and then decay, also by means of making reflected wave that in asbestos board, reflects and the reflected wave that in plasterboard, reflects interfere mutually and decay.Therefore, the volume reflection that can reduce electric wave is realized the improvement of the electric wave absorbent properties of built-in material.In addition, owing to be that substrate is constructed with the plasterboard, lamination asbestos board thereon again is so can improve the artistic conception of construction space.
Claims (12)
1. a wave absorber is characterized in that: have the layers 1 and 2 at least that contains conducting fibre respectively.
2. the described wave absorber of claim 1 is characterized in that: above-mentioned the 1st layer and above-mentioned the 2nd layer is made of inorganic material.
3. the described wave absorber of claim 2, it is characterized in that: above-mentioned the 1st layer is made of asbestos, and above-mentioned the 2nd layer is made of gypsum.
4. the described wave absorber of claim 2 is characterized in that: above-mentioned the 1st layer and above-mentioned the 2nd layer is made of asbestos.
5. claim 3 or 4 described wave absorbers, it is characterized in that: above-mentioned conducting fibre is a carbon fiber, and this conducting fibre contains 0.005～0.3g/l in above-mentioned the 1st layer, and this conducting fibre contains 0.1～1.0g/l in above-mentioned the 2nd layer.
6. the described wave absorber of any one in the claim 3～5, it is characterized in that: above-mentioned the 1st layer thickness is 1～30mm, above-mentioned the 2nd layer thickness is 1～30mm.
7. the described wave absorber of claim 1, it is characterized in that: above-mentioned the 1st layer is made of inorganic material, and above-mentioned the 2nd layer is made of organic material.
8. the wave absorber shown in the claim 7, it is characterized in that: above-mentioned the 1st layer is made of asbestos, and above-mentioned the 2nd layer constitutes by the organic system applying coating that contains conducting fibre is gone up to above-mentioned the 1st layer.
9. the described wave absorber of claim 8, it is characterized in that: above-mentioned conducting fibre is a carbon fiber, this conducting fibre content is 0.2～0.5g/l in above-mentioned the 1st layer, in above-mentioned the 2nd layer, total amount 100 weight % with respect to the 2nd layer, this conducting fibre content is 10～25 weight %.
10. the described wave absorber of claim 9, it is characterized in that: above-mentioned the 1st layer thickness is 1～30mm, the coating amount that constitutes above-mentioned the 2nd layer above-mentioned organic system coating is 100～3000g/m
2
11. the described wave absorber of any one in the claim 1～10 is characterized in that: the fibre length of above-mentioned conducting fibre is 0.1～30mm.
12. the construction method of a built-in material is characterized in that: be after substrate is constructed with the plasterboard that contains conducting fibre, stack one deck contains the asbestos board of conducting fibre on this plasterboard.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP143792/2000 | 2000-05-16 | ||
| JP2000143792A JP3482942B2 (en) | 2000-05-16 | 2000-05-16 | Radio wave absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1323158A true CN1323158A (en) | 2001-11-21 |
| CN1192698C CN1192698C (en) | 2005-03-09 |
Family
ID=18650557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001355880A Expired - Fee Related CN1192698C (en) | 2000-05-16 | 2000-12-20 | Construction method for radio wave absorber and built-in material |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3482942B2 (en) |
| KR (1) | KR100638066B1 (en) |
| CN (1) | CN1192698C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173703A (en) * | 2011-01-12 | 2011-09-07 | 北京工业大学 | Carbon black-gypsum based wave absorption composite material and preparation method thereof |
| CN105281043A (en) * | 2015-11-18 | 2016-01-27 | 上海理工大学 | Ultra broadband terahertz wave anti-reflection member and ultra broadband terahertz wave absorber |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4224703B2 (en) * | 2002-01-31 | 2009-02-18 | 日東紡績株式会社 | Electromagnetic wave absorber |
| JP4122364B2 (en) | 2006-08-23 | 2008-07-23 | 三菱電線工業株式会社 | Radio wave absorber and manufacturing method thereof |
| JP6121603B1 (en) * | 2016-07-21 | 2017-04-26 | 株式会社レジナ | Indoor paint |
| CN111848084A (en) * | 2020-07-21 | 2020-10-30 | 兰州理工大学 | High-strength gypsum-based wall body for weakening electromagnetic radiation and carrying out photocatalysis on harmful gas |
-
2000
- 2000-05-16 JP JP2000143792A patent/JP3482942B2/en not_active Expired - Lifetime
- 2000-10-16 KR KR1020000060646A patent/KR100638066B1/en not_active IP Right Cessation
- 2000-12-20 CN CNB001355880A patent/CN1192698C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173703A (en) * | 2011-01-12 | 2011-09-07 | 北京工业大学 | Carbon black-gypsum based wave absorption composite material and preparation method thereof |
| CN102173703B (en) * | 2011-01-12 | 2013-03-27 | 北京工业大学 | Carbon black-gypsum based wave absorption composite material and preparation method thereof |
| CN105281043A (en) * | 2015-11-18 | 2016-01-27 | 上海理工大学 | Ultra broadband terahertz wave anti-reflection member and ultra broadband terahertz wave absorber |
| CN105281043B (en) * | 2015-11-18 | 2018-07-27 | 上海理工大学 | A kind of ultra-wideband THz wave anti-reflection component and ultra-wideband THz wave absorber |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20010106074A (en) | 2001-11-29 |
| KR100638066B1 (en) | 2006-10-25 |
| CN1192698C (en) | 2005-03-09 |
| JP2001322194A (en) | 2001-11-20 |
| JP3482942B2 (en) | 2004-01-06 |
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Granted publication date: 20050309 Termination date: 20161220 |