JP2002076680A - Wave absorber marking tape, its manufacturing method, and method for controlling traffic utilizing encoding of the tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling traffic by which the occurrence of traffic accidents resulting in injury or death caused by vehicles can be reduced and, in addition, the safe movement and management of vehicles can be realized. SOLUTION: In this method for controlling traffic utilizing the encoding of a wave absorber marking tape, traffic control is performed by producing a wave absorbing pattern by means of a wave absorber formed by laminating one or more wave absorbing layers and heat transfer converting layers upon another and causing the drivers of the vehicles to read the pattern after the pattern is encoded and to act on a reaction mechanisms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
lligent Transport System
s), radar anti-image protection, radio interference prevention, and Elec
tro Magnetic Interference
(EMI) The present invention relates to an invention using a radio wave absorber used in the field of countermeasures. In particular, the present invention relates to an ITS radio wave absorber marking tape for high frequencies including millimeter waves and a manufacturing method thereof, and a traffic control method using encoding of the radio wave absorber marking tape. The radio wave absorber marking tape is to be installed on a road surface, a roadside zone, a sidewalk, a guardrail, a side wall of a road, or a ceiling surface of a tunnel.

[0002]

2. Description of the Related Art Intelligent transportation systems in Japan (I)
TS) is being promoted mainly by ministries and agencies, specifically, five ministries: postal administration, construction, transportation, self-government, and trade. The aim is to connect drivers, cars and roads with an information communication system, and to support safe driving and create a smooth road flow without traffic congestion like birds flying in a flock. Europe and the United States are also prioritizing Japan as part of a national project on ITS. In recent years, research in Japan has been progressing rapidly in recent years.

In particular, a charging system for roads and vehicles (ETC)
AHS, such as installing an accident prevention device
(Advanced Cruise-Assist Hi
ghway) is also included as a driving support road system. Among them, the following are planned and implemented: 1) Support for preventing collision with forward obstacles, 2) Support for preventing danger of entering a curve,
7) Support for lane departure prevention, 4) Collision prevention support for encounters, 5) Right turn collision prevention support, 6) Crosswalk pedestrian collision prevention support, 7) Road surface information-based inter-vehicle retention support.

[0004] On the other hand, there is the development of radio communication operation being promoted mainly by the Ministry of Posts and Telecommunications and the Ministry of International Trade and Industry. In this, ET
C (Electronic Toll Collect)
ION System), which is also called "non-stop toll collection system", is being tested using 54 toll booths in Chiba Prefecture, such as the Tokyo Bay Crossing Road, Keiyo Road, and Higashi Kanto Expressway. The frequency of the radio wave used here is a high frequency of 2 GHz to 7 GHz, and specifically, 2.1 to 2.4 GHz.
z and 5.8 to 6.3 GHz are used as international standards. In these road environments, high-frequency radio waves are frequently used for the purpose of traffic control, and the situation is becoming overflowing by mutual exchange. For this reason, there is a concern about malfunction due to noise or radio wave scattering, and a countermeasure is required.

[0005] Conventionally, various electromagnetic wave shielding materials have been used as a countermeasure against noise in electronic equipment products that emit electromagnetic waves. That is, in the case of the electromagnetic wave shield, basically, the electromagnetic wave is prevented from entering the electronic device housing by utilizing the reflection function for the incident unnecessary electromagnetic wave. Therefore, in this case, the same is true under the road environment, but the electromagnetic wave exists in the use space in some sense, which causes a secondary noise. on the other hand,
In the case of a conventional electromagnetic wave absorber, how much the reflection level from a radio wave absorber layer of the same area geometrically decreases from the reflection level from the metal plate which is a perfect reflector from the design stage, Is manufactured in consideration of how much it is absorbed by incident electromagnetic waves. Therefore, in this case, there is no electromagnetic wave incident on the use space. Therefore, this is a fundamental solution to unnecessary electromagnetic waves, and both are clearly distinguished in their operation and configuration.

The most basic type of the electromagnetic wave absorber is a one-layer type electromagnetic wave absorber lined with a structurally simple metal. Generally, there are many one-layer rubber sheet radio wave absorbers in which carbon particles are mixed in a rubber material. Further, there is a two-layer type radio wave absorber having a surface layer and an absorption layer. This is often a radio wave absorber using graphite-containing styrofoam or silicon carbide FRP.

[0007] Further, there is a multilayer type radio wave absorber which requires a wide band, such as a radio wave absorber used in an anechoic chamber. This is classified into a pyramid type and a wedge type according to the structural form.

[0008] As a thin film multilayer structure electromagnetic wave absorber, for example, "Flextel" (trade name) of Nippon Enesis Co., Ltd.
There is. In this method, a combination of more than 15 kinds of materials is determined from the construction conditions and manufactured. Furthermore, each layer is firmly bonded with a special thermoplastic adhesive, and it is impossible to correct it after construction or correct it on the spot. In addition, it is inevitable to be in a form corresponding to the frequency, and it is necessary to separately prepare constituent materials.

On the other hand, as described above, each form, shape,
Despite having a great influence on the radio wave absorption characteristics, especially the frequency (wavelength) characteristics, depending on the model, the sensors have not been optimally designed for ITS applications, and there are no traffic control systems using them. At present, it has become a system using advanced devices.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to newly propose traffic control using encoding of a radio wave absorber marking tape corresponding to ITS.
An object of the present invention is to embody an electromagnetic wave absorber marking tape capable of realizing an inexpensive and excellent electromagnetic wave absorption characteristic (improvement of a wide range of frequency attenuation characteristics and good oblique incidence characteristics) among electromagnetic wave absorbers corresponding to 10 GHz). . It is still another object of the present invention to provide the encoding of the radio wave absorber marking tape, which is the basis of the traffic control system, as a unique pattern in the radio wave absorbing layer, and to show a specific operation method. Further, the present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a configuration which is highly convenient and can be realized at low cost, and a method of manufacturing the same.

[0011]

Means for solving the problems include: (1) radio wave absorption consisting of a radio wave absorption pattern formed by a radio wave absorber composed of a radio wave absorption layer for absorbing radio waves and / or electromagnetic waves; Body marking tape. (2) A radio wave absorber marking tape composed of a radio wave absorber formed by laminating one or more radio wave absorbing layers and a heat transfer conversion layer. (3) A radio wave absorber marking characterized in that the radio wave absorption pattern of (1) or (2) is encoded.
tape. (4) A method for producing a radio wave absorber marking tape in which a radio wave absorber composed of a radio wave absorbing layer for absorbing radio waves and / or electromagnetic waves is patterned to produce a radio wave absorbing pattern. (5) A method for producing a radio wave absorber marking tape in which a radio wave absorber formed by laminating one or more radio wave absorbing layers and a heat transfer conversion layer is patterned to form a radio wave absorbing pattern. (6) A method for producing a radio wave absorber marking tape, comprising coding the radio wave absorption pattern according to claim 4 or 5. (7) Using a radio wave absorber consisting of a radio wave absorption layer to absorb radio waves and / or electromagnetic waves, create a radio wave absorption pattern, encode and read it, and operate the reaction mechanism to control traffic. A traffic control method using encoding of a radio wave absorber marking tape characterized by the following. (8) A radio wave absorption pattern is produced by a radio wave absorber made by laminating one or more radio wave absorption layers and a heat transfer conversion layer,
A traffic control method using coding of a radio wave absorber marking tape, characterized in that it is encoded and read and traffic control is performed by operating a reaction mechanism. (9) The reaction mechanism of (7) or (8) is a radio transmitter,
Radio receivers, towers, warning signs, radar, in-vehicle receivers,
A traffic control method using encoding of a radio wave absorber marking tape characterized by comprising one of a management center and a combination of two or more of them. (10) A radio wave absorber marking tape, wherein a fixing layer is provided on the back surface of the heat transfer conversion layer according to (2) or (3). Was invented.

The fixing layer in (10) is for fixing to a road surface to be installed, a road side zone, a guardrail, a side wall of a road, a ceiling surface of a tunnel, or the like. The main jig may be used. Furthermore, the shape may be flat or uneven, or a spike or special equipment that bites in for more positive fixation. Further, it is preferable that the "wave absorber" of the present invention further has a configuration in which the heat transfer conversion layer is formed of a high heat conductive resin sheet using organic fibers. The heat transfer conversion layer is generally made of a metal plate such as aluminum or copper, or a metal net, and is processed as a product.However, from the viewpoint of light weight and heat dissipation and thermal conductivity, high heat using organic fibers such as carbon fiber is used. It is preferable to use a conductive resin sheet.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a radio wave absorber marking tape according to the present invention will be described below with reference to FIGS. First, the radio wave absorber marking of the present invention
The material of the tape is a radio wave absorber. The radio wave absorber directly or directly connects the radio wave absorption layer and the heat transfer conversion layer,
This is a configuration in which the layers are laminated via an adhesive layer. FIG. 1 is a sectional view of one embodiment of the radio wave absorber marking tape of the present invention. The radio wave absorber marking tape 6 of FIG. 1 has a configuration in which a radio wave absorption layer 1, a heat transfer conversion layer 5, and a fixed layer 2 are laminated. FIG. 2 is a sectional view showing the configuration of another embodiment of the radio wave absorber marking tape of the present invention. The radio wave absorber marking tape 7 in FIG. 2 has a configuration in which a radio wave absorption layer 3, a radio wave absorption layer 4, a heat transfer conversion layer 5, and a fixed layer 2 are laminated.

Hereinafter, each of these layers will be described in more detail.

(Radio Wave Absorbing Layer) The radio wave absorbing layer for absorbing radio waves and / or electromagnetic waves is preferably made of a material that is conscious of weight reduction. That is, generally, magnetic metals such as ferrite are mainly used. However, in order to further reduce the weight, carbon powder (carbon black), rare earth powder, or Co or Fe having magnetic spin is mainly used. Organometallic complexes used as metals are used. There are mainly roll-rolling methods and hot-pressing methods for fixing these to form a radio wave absorbing layer. Here, a hot press method which is simple and hardly causes anisotropy is used.

In the hot pressing method, the mixing ratio of carbon black to a binding material such as rubber is changed and mixed.
After mixing with a paint roll, the thickness is variously adjusted with a spacer and hot-pressed. Of course, instead of carbon black, a rare earth powder or an organic metal complex having a magnetic spin of Co, Fe or the like as a central metal may be dispersed and kneaded in the binding material. Instead of dispersing and mixing, a method of impregnating a carbon black or a rare earth powder or an organometallic complex having a magnetic spin with Co, Fe, or the like as a central metal with a binding material and curing and binding is used. In some cases, the thickness is adjusted in various ways with a spacer, and the product is manufactured by a hot press or a rolling roll.

As the binding material, various rubbers such as epoxy-modified urethane rubber, silicone, and various synthetic resins are used. Further, a Kapton resin, a polyimide resin, or the like as a resin for high frequency can be used. L
An ow-k (low dielectric constant) material can also be used. For example, polyethylene resins, polypropylene resins, polymethylpentene resins, polybutene resins, ethylene-propylene copolymer resins, olefinic resins such as olefinic thermoplastic elastomers, polyvinyl chloride resins, polyvinylidene chloride resins, polyvinyl alcohol resins, polyvinyl chloride resins Vinyl-based resins such as vinyl acetate copolymer resins, ethylene-vinyl acetate copolymer resins, ethylene-vinyl alcohol copolymer resins,
Polyethylene terephthalate resin, polybutylene terephthalate resin, polyethylene naphthalate, ethylene-
Terephthalate-isophthalate copolymer resin, polyester-based resin such as polyester-based thermoplastic elastomer,
Acrylic resins such as poly (methyl meth) acrylate resin, poly (meth) ethyl acrylate resin, poly (meth) acrylate resin, methyl (meth) acrylate-butyl (meth) acrylate copolymer resin, nylon 6 Or a polyamide resin represented by nylon 66, a cellulose triacetate resin, a cellophane, a polystyrene resin, a polycarbonate resin, a polyarylate resin, a polyimide resin, an epoxy phenol resin, an epoxy resin, an epoxy urethane modified resin, or a phenol resin. Of the above,
It is preferable to use epoxy-modified urethane rubber, silicone, epoxy phenol resin, epoxy urethane-modified resin, phenol resin, acrylic resin and the like.

As a disperser for mixing and dispersing, a paint shaker, a bead mill, an attritor, or the like may be used in addition to the above-described paint roll. When adjusting to the design thickness with a spacer and manufacturing by hot pressing, for example, regarding the design numerical values and the like, the dispersion formulation was determined with reference to a paper by Osamu Hashimoto and the like. (Osamu Hashimoto et al .: Transactions of the Institute of Electronics, Information and Communication Engineers, B Vol. J82-B No. 3 pp. 4
69-475 Mar 1999)

Various radio wave absorption layers having different radio wave absorption characteristics depending on the type, mixing ratio, and thickness of the radio wave absorption layer, such as carbon black, rare earth powder, or organometallic complexes having a central metal such as Co or Fe having magnetic spin. Can be produced.

Further, the various radio wave absorption layers having different radio wave absorption characteristics manufactured as described above may be used as a single layer, or may be used by laminating a plurality of layers directly or via an adhesive layer (FIGS. 1 and 2). ). The reason why the radio wave absorption layer has a multi-layer structure is to aim at an effect similar to that of the band-pass filter, and to use only a desired frequency with an absorption characteristic or to use the reflected frequency.

(Heat Transfer Conversion Layer) In general, the heat transfer conversion layer 5 is a product obtained by compounding a metal plate such as aluminum or copper, a metal net, and aluminum foil. Here, it is preferable to use a high heat conductive resin sheet using organic fibers or inorganic fibers from the viewpoints of light weight, heat dissipation, and heat conductivity.

This can be obtained by controlling the fiber direction of special fibers such as carbon fibers, aramid fibers, and glass fibers, aligning them at a high concentration, and curing them with a thermosetting resin such as an epoxy resin or a polyimide resin. For example, it is preferable to use MATELIGHT (carbon fiber reinforced plastic, aramid fiber reinforced plastic, glass fiber reinforced plastic) (trade name of Nikkiso Co., Ltd.) or a fiber oriented composite material of Polymertec Corporation. Various carbon fibers such as rayon-based, polyacrylonitrile (PAN) -based, phenolic resin-based, coal pitch-based, and petroleum pitch-based carbon fibers can be used as the carbon fiber.
m and an average fiber length of about 0.1 to 10 mm are preferably used.

Here, without controlling the fiber direction of special fibers such as carbon fibers, aramid fibers (aromatic polyamide fibers), and glass fibers, the fibers may be cured with a thermosetting resin such as an epoxy resin or a polyimide resin. The thermosetting resin is, for example, a general thermosetting resin such as an epoxy resin, a BMI-based resin (a phenol resin, an unsaturated polyester resin, a furan resin, etc.), a polyimide resin and the like, and is not particularly limited. In addition, the thermosetting resin, if necessary,
A compounding agent such as a curing agent can be compounded. Instead of a thermosetting resin such as an epoxy resin or a polyimide resin, a thermoplastic resin such as polyetheretherketone or polyphenylene sulfide may be used.

The special fibers include natural organic fibers such as fibers (including cellulose pulp) obtained from plant materials such as cotton, hemp, bamboo, and wood; and natural or natural fibers such as silicon carbide fibers, metal fibers, sepiolite, and asbestos. Are artificial inorganic fibers, polyester, polyacrylonitrile, polyvinyl alcohol,
Artificial organic fibers such as polypropylene and polyamide fibers can also be used.

Embodiments of the radio wave absorber marking tape of the present invention, including specific examples, will be described below. First, a typical structure of the radio wave absorber marking tape of the present invention will be described with reference to FIGS. 3, 4 and 5. FIG. FIG. 3 is a perspective view of one embodiment of the radio wave absorber marking tape of the present invention. FIG. 4 is a perspective view of one embodiment of the radio wave absorber marking tape of the present invention. FIG. 5 is a perspective view of one embodiment of the radio wave absorber marking tape of the present invention.

(Example of producing electromagnetic wave absorber marking tape)
The manufacturing method is described below. As a method for producing the radio wave absorption layer, the production apparatus mainly includes a rolling roll method and a hot press method, but here, a simple hot press method was used. 50 g of epoxy phenol resin was used as the resin of the radio wave absorbing layer, and 10 g of carbon black was used as the radio wave absorbing medium. The carbon black used was Cabot Corporation's microcarbon. This microcarbon was dispersed and kneaded with the resin at a different mixing ratio. To adjust the viscosity, the solvent used was toluene: ethyl acetate = 2: 1.
Was added in an amount of 25 g. The disperser used was a combination of a paint shaker, a bead mill, an attritor, a paint roll, and the like. Several PET films were stacked and used as spacers, adjusted to a design thickness, and produced by hot pressing. For example, regarding the design numerical values, etc., refer to the paper by Osamu Hashimoto and the like, and set the thickness of the entire radio wave absorber marking sheet to 0.
It was determined to be 9 mm. (Osamu Hashimoto et al .: Transactions of the Institute of Electronics, Information and Communication Engineers, B Vol. J82-BNo.3 pp.469-
475, March 1999) Coloring or pattern design may be applied to enhance the design of the marking tape or to attract visual attention. Further, a fluorescent pigment or a luminous pigment may be added and used so as to be visible even at night.

The heat transfer conversion layer is made of Nikkiso Co., Ltd., having a trade name of MATELIGHT COMPOSITE 0.3 mm.
The thickness was used as is. No bonding layer was provided between the layers, and the layers were directly bonded by thermocompression bonding. In the case of a multi-layer structure, only the radio wave absorbing layer was laminated by repeating the necessary number of steps for each layer to form a radio wave absorber. The reason for adopting the multi-layer structure is to aim at an effect similar to that of the band-pass filter, and to use only a target frequency (for example, 2.1 to 2.5 GHz) in an absorption characteristic or to use it by reflecting. It is.
The thickness of the radio wave absorber is 2 layers of the radio wave absorption layer and 1 layer of the heat transfer conversion layer.
The thickness of the layers was 1 cm.

The radio wave absorption characteristics were measured by the Advantest method. 1G for single-layer (A) radio wave absorption layer
An absorption loss of -25 dB was confirmed to be almost flat at a frequency of 3 Hz to 3 GHz (due to a measurement limit). Furthermore, in the case of the radio wave absorption layer multilayer (B) (two more radio wave absorption layers are laminated on the upper surface of A), 5 GHz to 8 GHz (due to the measurement limit)
, An absorption loss of -27 dB was confirmed almost flat. Further, a sharp absorption peak was observed at 15 GHz to 20 GHz (due to the measurement limit), and an absorption loss of -15 dB was confirmed.

Since the surface of the electromagnetic wave absorbing layer is exposed to friction caused by braking of an automobile or the like, it is preferable to provide a surface protective layer. Such a surface protective layer is required to have wear resistance and heat resistance. Further, such a surface protective layer is formed with a thickness that does not change the radio wave absorption characteristics.

In the present invention, the crosslinkable resin used as a binder for forming the surface protective (abrasion resistant resin) layer on the surface of the radio wave absorbing layer is an ionizing radiation curable resin or a thermosetting resin (room temperature curable resin). , And a two-component reaction-curable resin) can be used. As the crosslinkable resin, ionizing radiation curable resin has a high curing speed and good workability,
Moreover, it is preferable because the physical properties of the resin such as hardness can be easily adjusted. Further, the selection of the above-mentioned crosslinkable resin can be appropriately selected depending on the application.

The ionizing radiation-curable resin used as the crosslinkable resin is, specifically, a radical polymerizable unsaturated bond such as a (meth) acryloyl group or a (meth) acryloyloxy group in the molecule. It means acryloyl or methacryloyl.) Alternatively, a composition curable by ionizing radiation, which is obtained by appropriately mixing a prepolymer, an oligomer, and / or a monomer having an epoxy group, is used. Here, the ionizing radiation means an electromagnetic wave or a charged particle beam having an energy quantum capable of polymerizing or cross-linking a molecule, and usually an ultraviolet ray or an electron beam is used.

Examples of the above prepolymers and oligomers include unsaturated polyesters such as condensates of unsaturated dicarboxylic acids and polyhydric alcohols, polyester (meth) acrylates, urethane (meth) acrylates, polyether (meth) acrylates, polyols (Meth) acrylate,
(Meth) acrylates such as silicon (meth) acrylate, triazine (meth) acrylate, and melamine (meth) acrylate (provided that (meth) acrylate means acrylate or methacrylate).

Examples of monomers used for the ionizing radiation curable resin include styrene monomers such as styrene and α-methylstyrene, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and (meth) acrylate. )
(Meth) acrylates such as butyl acrylate, methoxyethyl (meth) acrylate, ethoxymethyl (meth) acrylate, phenyl (meth) acrylate, lauryl (meth) acrylate, and (meth) acrylic acid-2 −
Unsaturation such as (N, N-dimethylamino) ethyl, 2- (N, N-dibenzylamino) methyl (meth) acrylate, 2- (N, N-diethylamino) propyl (meth) acrylate Substituted amino alcohol esters of acids, unsaturated carboxylic acid amides such as (meth) acrylamide, ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, neopentyl glycol di (meth) ) Acrylates, compounds such as 1,6 hexanediol di (meth) acrylate, triethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate , Dieci Polyfunctional compounds such as glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (tetra) (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and / or Polythiol compounds having two or more thiol groups, such as trimethylolpropane trithioglycolate, trimethylolpropane trithiopropylate, and pentaerythritol tetrathioglycol. [In the present invention, (meth) acrylate is used in the meaning of acrylate or methacrylate. ]

Usually, one or more of the above compounds are used, if necessary, in admixture. In order to impart ordinary coating suitability to the ionizing radiation-curable resin, the prepolymer or polythiol is used in combination. It is preferable that the content of the monomer and / or polythiol be not more than 95% by weight.

Further, a non-ionizing radiation curable resin for adjusting physical properties such as flexibility and surface hardness of the cured product can be added to the ionizing radiation curable resin. As the ionizing radiation non-curable resin, thermoplastic resins such as urethane-based, cellulose-based, polyester-based, acrylic-based, butyral-based, polyvinyl chloride, and polyvinyl acetate are used. Particularly, cellulose-based and urethane-based resins are used. Butyral is preferred from the viewpoint of flexibility.

Examples of the compound having a cationic polymerization type functional group include epoxy resins such as bisphenol epoxy resins and novolak epoxy compounds, and vinyl ether resins such as fatty acid vinyl ethers and aromatic vinyl ethers.

When ultraviolet rays are irradiated to cure the ionizing radiation-curable resin having the above composition, a prepolymer having a radical polymerizable unsaturated bond is used as a photopolymerization initiator, and acetophenone is used as a monomer. Kind,
Benzophenones, Michler benzoyl benzoate,
As the α-aminoxime ester, tetramethylthiuram monosulfide, thioxanthone, and cationically polymerizable epoxy compound, aromatic diazonium salts, aromatic sulfonium salts, metallocenes and the like are used. Further, n-butylamine, triethylamine, tri-n-butylphosphine and the like can be further mixed and used as a photopolymerization accelerator (sensitizer).

Specific examples of the thermosetting resin used as the crosslinkable resin include a phenol resin, a urea resin, a diallyl phthalate resin, a melamine resin, a guanamine resin, an unsaturated polyester resin, and a polyurethane resin (two-component polyurethane also). Epoxide resin, amino alkyd resin, melamine-urea co-condensation resin, silicon resin (including polysiloxane resin), and the like. If necessary, a crosslinking agent, a curing agent such as a polymerization initiator, a polymerization accelerator, etc. may be added and used. As the above-mentioned curing agent or cross-linking agent, isocyanate or organic sulfonate is usually used for unsaturated polyester resin or polyurethane resin, amine is used for epoxy resin,
A peroxide such as methyl ethyl ketone peroxide and a radical initiator such as azoisobutylnitrile are often used for unsaturated polyesters and the like.

As the above-mentioned isocyanate, divalent or higher valent aliphatic (or alicyclic) or aromatic isocyanate can be used, but aliphatic (or alicyclic) isocyanate is preferable from the viewpoint of thermal discoloration prevention and weather resistance. Is desirable. As an aromatic isocyanate as a specific isocyanate, 2,
4-tolylene diisocyanate, xylylene diisocyanate, 4,4'-diphenylmethane diisocyanate, aliphatic or cycloaliphatic isocyanates,
6-hexamethylene diisocyanate, lysine diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, and the like. Alternatively, adducts or multimers of these isocyanates are also used.

The two-component polyurethane resin includes a first liquid composed of a polyol compound having an average of two or more hydroxyl groups in its molecular structure, and a second liquid composed of a polyisocyanate compound. And so that the equivalent ratio becomes 0.7 to 1.5.

The epoxy resin includes an epoxy resin having an average of two or more epoxy groups in its molecular structure and a mono- or poly-amine having three or more active hydrogens in one molecule which react with the epoxy group. Examples include those blended such that the ratio of the epoxy equivalent of the epoxy resin to the active hydrogen equivalent of the mono or polyamine is 0.7 to 1.5.

In the coating composition comprising a crosslinkable resin as the binder, in addition to the above components, a coloring agent such as a dye or a pigment, a lubricant such as a wax, an ultraviolet absorber, a light stabilizer, a defoamer , A leveling agent, a thixotropy-imparting agent, and other additives usually added to paints and inks.

In order to adjust the viscosity, the components of the crosslinkable resin can be dissolved in the coating composition for the surface protective (abrasion-resistant resin) layer. 1
A solvent at 50 ° C. can be used in the composition in a range of 30% by weight or less. When the amount of the solvent added is in the range of 30% by weight or less, drying is smooth, and there is no significant decrease in production speed.

As the above-mentioned solvent, those which are usually used for paints, inks and the like can be used. Specific examples thereof include aromatic hydrocarbons such as toluene and xylene, and ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone. , Ethyl acetate, isopropyl acetate, butyl acetate, acetates such as amyl acetate, methyl alcohol, ethyl alcohol, alcohols such as isopropyl alcohol, dioxane, tetrahydrofuran,
Examples thereof include ethers such as diisopropyl ether and a mixture of two or more thereof.

Next, a method for forming a surface protective (abrasion-resistant resin) layer on the surface of the radio wave absorbing layer using the above coating composition will be described. For the surface protective layer, a direct coating method of directly applying (also referred to as coating) the coating composition on the surface of the radio wave absorbing layer is used.

The above direct coating method includes gravure roll coat, gravure reverse roll coat, gravure offset coat, spinner coat, roll coat,
Reverse roll coat, kiss coat, wheeler coat,
Dip coating, solid coating by silk screen printing, wire bar coating, flow coating, comma coating, pouring coating, brush coating, spray coating, etc. can be used, but a thin film of about 1 to 100 μm is coated uniformly and at a high speed. A gravure roll coat is preferable for processing.

When an ionizing radiation-curable resin is used as the crosslinkable resin, the ionizing radiation irradiator used for curing the resin may be an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon Light sources such as arc lamps, black light lamps, and metal halide lamps are used.When irradiating an electron beam, a Cockloft-Walton type, a bandeograph type, a resonance transformer type, an insulating core transformer type, or a linear type is used. Various electron beam accelerators such as a dynamitron type and a high frequency type are used.

The irradiation amount of ultraviolet light is usually 190 to 3
UV rays mainly having a wavelength range of about 80 nm
The irradiation amount is about 00 mJ / cm ² .

The irradiation amount of the electron beam is usually 100 to 1000
An electron having an energy of keV, preferably 100 to 300 keV is converted to 1 kGy (0.1 Mrad) to 300 kG.
y. Irradiate with an irradiation amount of about (30 Mrad). If the irradiation amount is less than 0.1 Mrad, curing may be insufficient. If the irradiation amount exceeds 30 Mrad, the cured coating film may be damaged, discolored such as yellowing, or the strength may be reduced. There is a risk of doing this.

The above-mentioned radio wave absorber sheet was cut into a required width as a required marking tape by a coding method shown below. Further, a commercially available adhesive (trade name: Cemedine) was applied to the back surface, and a plurality of sheets were fixed on an experimental flat table at appropriate intervals.

(Encoding method of radio wave absorber marking tape) The encoding method of the radio wave absorber marking tape is shown in FIGS. A method of expressing bits 0 and 1 in a portion 9 having radio wave absorption and a portion 10 having no radio wave absorption by using the whole sheet 8 having radio wave absorbing ability at intervals (FIG. 3);
When the radio wave absorber sheet 11 is cut into a tape using pattern recognition, the presence or absence of absorption follows the shape of the radio wave absorber marking tape 12 and is determined based on the presence or absence of absorption.
(FIG. 4) and a method of expressing bits 0 and 1 by the presence or absence of radio wave absorption based on the installation distance of the radio wave absorber marking tape 13 itself (FIG. 5). The accuracy of the recognition rate and the low rate of misrecognition were low when the method of discriminating from the installation distance and expressing bits 0 and 1 by the presence or absence of radio wave absorption was the best.

(Vehicle Traffic Control System Using Radio Wave Absorber Marking Tape) FIG. 6 shows a traffic control system for cars (including automobiles, motorcycles, and bicycles) using the radio wave absorber marking tape. Radio wave absorber marking
The tape 19 is set on the road 15. Further signal 25
The warning sign 20 is installed near the stop line 21 before the pedestrian crossing 26. In addition, a radio wave transmitter 16 and a radio wave receiver 17 are installed near the location where the marking tape 19 is installed. The encoding of the radio wave is determined by the radio wave absorber marking tape 19, and bit 0,
Expression 1 is determined. There are two categories.

First, the radio wave transmitter 16 and the radio wave receiver 1
7. Second, cars, motorcycles,
The control is performed by the mobile vehicle 22 itself such as a bicycle. A first control method via radio wave transmission and a receiver will be described with reference to FIG. Radio waves transmitted continuously or intermittently in a range where vehicle confirmation is performed from a tower 18 provided with a radio wave transmitter 16 in advance are absorbed by a radio wave absorber marking tape 19 fixed on a road surface. It is divided into a radio wave reflecting surface of the road itself. The radio wave information is monitored and determined by the receiver 17 from the tower 18. In the case of rain or a partial change in dirt, the recognition level is adjusted by an image or information processing in a frame memory or the like.

Next, since the moving vehicle 22 blocks the installed radio wave absorber marking tape 19, the vehicle has a radio wave reflection surface, and is recognized as a bit 1 of radio wave reflection as a pattern code. . This can be recognized and determined as moving body speed information and position information while passing through several marking tapes 19. This information is recognized and determined by the management center, and the warning sign 20 installed in front of the moving object is set.
Flashes red to give the driver a normal stop line 21
Call for early attention in the foreground.

FIG. 6 shows a second control method performed by the mobile vehicle 22 itself. This is the mobile vehicle 22
This is a control method by transmitting and receiving radio waves by itself. The mobile vehicle continues to emit radio waves 24 from the radar 23. When the radio wave absorber marking tape 19 is located, the reflected radio wave continuously returns to the in-vehicle receiving device 23. Here, the recognition judgment of the encoded pattern is performed, and the speed is controlled. The speed adjustment may reduce the fuel injection amount by making the driver notice as an in-vehicle warning sound or by acting on the drive device, for example, by acting on the carburetor of the engine device. In this way, the vehicle can be safely and completely stopped near the stop line 21. In this embodiment, the radio wave absorber marking tape 19 is installed on the surface of the road 15, but as another example, it may be installed on a road side zone, a guard rail, a side wall of a road, or a ceiling surface of a tunnel.

[0056]

According to the present invention, a new traffic control method utilizing ITS-compliant radio wave absorber marking tape coding has been created. In particular, an electromagnetic wave absorber marking tape that is inexpensive and has excellent electromagnetic wave absorption characteristics (improved wide-range frequency attenuation characteristics and good oblique incidence characteristics) has been obtained for electromagnetic wave absorbers corresponding to high frequencies (2 GHz to 10 GHz). . Furthermore, by providing the encoding of the radio wave absorber marking tape, which is the basis of the traffic control system, as a unique pattern in the radio wave absorbing layer and showing a specific operation method, it is possible to realize a traffic control system that is highly convenient and inexpensive. The structure and the manufacturing method thereof can be provided. It is possible to provide traffic control using encoding of the radio wave absorber marking tape corresponding to ITS, and it is possible to reduce the occurrence of personal injury to vehicles. Furthermore, the traffic control method of the present case enables safe operation management of vehicles.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of a radio wave absorber marking tape of the present invention.

FIG. 2 is a sectional view of another embodiment of the radio wave absorber marking tape of the present invention.

FIG. 3 is a perspective view showing an example of a radio wave absorber marking tape and an encoding method of the present invention.

FIG. 4 is a perspective view showing an example of a radio wave absorber marking tape and an encoding method of the present invention.

FIG. 5 is a perspective view showing an example of a radio wave absorber marking tape and an encoding method of the present invention.

FIG. 6 is a perspective view showing a traffic control system of a car (automobile) using the radio wave absorber marking tape of the present invention.

[Explanation of symbols]

 Reference Signs List 1 radio wave absorption layer 2 fixed layer 3 radio wave absorption layer 4 radio wave absorption layer 5 heat transfer conversion layer 6 radio wave absorber marking tape 7 radio wave absorber marking tape 8 whole sheet 9 part with radio wave absorption 10 part without radio wave absorption 11 Radio wave absorber sheet 12 Radio wave absorber marking tape 13 Radio wave absorber marking tape 15 Road 16 Radio wave transmitter 17 Radio wave receiver 18 Tower 19 Radio wave absorber marking tape 20 Warning sign 21 Stop line 22 Mobile vehicle 23 Radar, In-vehicle receiving device 24 Radio wave transmission 25 Signal 26 Crosswalk

Continued on front page F-term (reference) 4F100 AA37H AK12 AK25 AK33 AK53 AL01 AR00A AR00B AR00C AR00D AR00E BA02 BA03 BA04 BA05 BA06 BA07 BA10A BA10C BA10D BA10E EH46 EH462 EJ53 EJ532 EJ54 EJ542 J41G90 JG10 J41G90 JG10E AA50 BB25 GG05 GG11

Claims (10)

[Claims] 1. A radio wave absorber marking tape comprising a radio wave absorption pattern formed by a radio wave absorber comprising a radio wave absorption layer for absorbing radio waves and / or electromagnetic waves. 2. A radio wave absorber marking tape comprising a radio wave absorption pattern formed by laminating at least one radio wave absorption layer and a heat transfer conversion layer. 3. A radio wave absorber marking tape, wherein the radio wave absorption pattern according to claim 1 or 2 is encoded. 4. A method for producing a radio wave absorber marking tape, comprising forming a radio wave absorption pattern by patterning a radio wave absorber comprising a radio wave absorption layer for absorbing radio waves and / or electromagnetic waves. 5. A method for manufacturing a radio wave absorber marking tape, comprising forming a radio wave absorption pattern by patterning a radio wave absorber formed by laminating one or more radio wave absorption layers and a heat transfer conversion layer. 6. A method for producing a radio wave absorber marking tape, comprising coding the radio wave absorption pattern according to claim 4. 7. A radio wave absorber composed of a radio wave absorbing layer for absorbing radio waves and / or electromagnetic waves, forms a radio wave absorption pattern, encodes and reads it, and operates a reaction mechanism to control traffic. A traffic control method using radio wave absorber marking / tape encoding which is characterized in that: 8. A radio wave absorption pattern comprising one or more radio wave absorption layers and a heat transfer conversion layer laminated to produce a radio wave absorption pattern, which is coded and read, and operated by a reaction mechanism. A traffic control method using radio wave absorber marking tape coding, characterized by performing control. 9. The reaction mechanism according to claim 7, wherein the reaction mechanism is any one of a radio wave transmitter, a radio wave receiver, a tower, a warning sign, a radar, an in-vehicle reception device, a management center, or a combination of two or more of them. A traffic control method using radio wave absorber marking tape encoding. 10. A radio wave absorber marking tape, wherein a fixed layer is provided on the back surface of the heat transfer conversion layer according to claim 2.