WO2010064285A1 - 装飾皮膜とその形成方法 - Google Patents
装飾皮膜とその形成方法 Download PDFInfo
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- WO2010064285A1 WO2010064285A1 PCT/JP2008/071765 JP2008071765W WO2010064285A1 WO 2010064285 A1 WO2010064285 A1 WO 2010064285A1 JP 2008071765 W JP2008071765 W JP 2008071765W WO 2010064285 A1 WO2010064285 A1 WO 2010064285A1
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- decorative film
- metal nanoparticles
- film
- decorative
- organic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/52—Radiator or grille guards ; Radiator grilles
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
- G01S7/032—Constructional details for solid-state radar subsystems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
- G01S2013/9327—Sensor installation details
- G01S2013/93271—Sensor installation details in the front of the vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
Definitions
- the present invention relates to a decorative coating formed on the surface of a resin base material and in a radar apparatus path, and a method for forming the decorative coating.
- Antennas that transmit and receive radio waves are given priority in function, so the antenna body and the surrounding structure are less likely to be restricted in terms of design.
- antennas for vehicle radios, etc. A rod antenna having an exposed antenna shape is used.
- the performance is demonstrated. In order to do so, it is preferable to provide it at the center position of the vehicle front. In such a case, for example, an antenna is attached in the vicinity of the front grille of the vehicle, but it is desirable that the antenna is not visible from the outside as much as possible from the design surface.
- the auto cruise system measures the inter-vehicle distance and relative speed between the vehicle ahead and the host vehicle using sensors mounted in front of the vehicle, and controls the throttle and brake based on this information to accelerate and decelerate the host vehicle. It is a technology that controls the distance between cars.
- This auto-cruise system is attracting attention as one of the technologies of the Intelligent Transport System (ITS) aimed at reducing traffic congestion and reducing accidents in recent years.
- ITS Intelligent Transport System
- a radio wave transmission / reception device such as a millimeter wave radar is used as a sensor used in the auto cruise system.
- a radar device installed in a vehicle is generally disposed behind a front grille, and this front grille is generally equipped with an emblem of a vehicle manufacturer or a decoration unique to the vehicle. It is.
- the millimeter wave emitted from the radar device is radiated forward through the front grille or emblem and reflected by an object such as a forward vehicle or a front obstacle, and this reflected light is transmitted to the radar device through the front grille or emblem. It comes to return. Therefore, it is desirable to use a material or a paint that has a small radio wave transmission loss and can give a desired aesthetic appearance at a place such as a front grille or an emblem disposed in the beam path of the radar apparatus.
- the radio wave transmission cover disclosed in Patent Document 1 is formed by laminating a plurality of resin layers formed with unevenness, and in this coated component, metal deposited with unevenness between resin layers The layer can give the impression that the fin members of the front grille are continuously present in the radio wave transmission cover.
- indium As the metal deposited on the radio wave transmission cover, indium is generally used. However, when indium is deposited on the deposition material, indium is deposited on the surface of the deposition material in a uniform film shape. Instead, it is deposited in fine islands. That is, when indium is vapor-deposited on the material to be vapor-deposited, the surface of the material to be vapor-deposited is in a state where fine island-shaped vapor-deposited portions where indium is vapor-deposited and non-vapor-deposited portions where nothing is vapor-deposited are finely mixed. Radio waves can pass through this non-deposited part and can enter and exit.
- Patent Documents 2 and 3 disclose techniques for forming a metal layer by vapor deposition or sputtering in the same technical field as Patent Document 1 described above.
- the indium film has a metallic color, it is suitable for a film such as an emblem, but has a drawback that it is easily peeled off and has poor durability and wear resistance. Moreover, since it is a metal, the possibility of corrosion cannot be denied.
- a ceramic film made of silicon dioxide or the like there is a measure of excellent durability and protecting the film or paint, but the ceramic film made of silicon dioxide or the like is colorless, metallic color, etc. The design has the disadvantage of not being able to provide a beautiful aesthetic.
- Patent Document 4 a radar apparatus in the beam path having a base made of a resin layer and a bright decoration layer made of tin and / or a tin alloy on the surface of the base.
- the idea of the molded product is disclosed, and by using the bright decoration layer made of tin and / or a tin alloy, it is possible to improve hardness and wear resistance as compared with the indium layer of the prior art, and Made it possible to improve radio wave transmission as compared with the indium layer.
- Japanese Patent Laid-Open No. 2000-159039 Japanese Patent No. 3366299 Japanese Patent No. 3597075 JP-A-2005-212745
- the present invention has been made in view of the above-described problems.
- the present invention relates to a decorative film formed on the surface of a resin base material located in a radar apparatus path and a method for forming the decorative film.
- An object of the present invention is to provide a decorative film and a method for forming the same, which do not require control, and therefore have a high yield and efficiency during formation, and are excellent in radio wave permeability, exhibiting a metallic color tone and excellent appearance design.
- a method for forming a decorative film according to the present invention is a method for forming a decorative film on the surface of a resin substrate located in a radar apparatus path, in which organic molecules are coordinated around the surface.
- An organic material is formed by dispersing metal nanoparticles in a solvent, the organic material is applied to the surface of a resin base material, the solvent is volatilized, and the metal nanoparticles are dispersed in the organic film.
- a decorative film is formed.
- the decorative coating formed by the forming method of the present invention is applied to the surface of a resin base material located in the radar device path, so that it has a metallic luster and has an electrical insulating property (radio wave transmission).
- a film having a property Since the decorative film has a metallic luster, the decorative film can be essentially an electrically conductive film, but this film is formed by dispersing metal nanoparticles in the organic film, so that the insulating film has a metallic luster and has an insulating property. It has a coating. This is because the distance between the particles is extremely short because the metal to be dispersed is a metal nanoparticle, so that the particles are densely aggregated and provide a metallic luster to the human eye, while each nanoparticle.
- the millimeter wave attenuation of the radio wave is extremely small, and as a result, it can be a film having an electrical insulating property while having a metallic luster in appearance.
- the resin base material to which the decorative film is applied includes all of the emblems of the vehicle manufacturing company described above and the decorative products peculiar to the vehicle.
- metal nanoparticles in which organic molecules are coordinated around are generated, and this is dispersed in a solvent to generate an organic material.
- “coordinated” means that metal nanoparticles and an organic molecule (organic polymer) are bonded with chemical interaction.
- the metal nanoparticles used are not particularly limited, and examples thereof include gold and its alloys, silver and its alloys, tin and its alloys, indium and its alloys, etc. From the viewpoint of both metallic luster and silver, it is preferable to use silver or an alloy thereof.
- a decorative film is formed by applying the organic material to the surface of the resin substrate and volatilizing the solvent.
- this coating method for example, methods such as spin coating, bar coating, screen printing, spray coating, gravure printing, and roll coater can be applied.
- the decorative film formed by the above method is a film in which metal molecules are dispersed in an organic film by binding organic molecules coordinated around the metal nanoparticles to each other. is there.
- the organic molecules are bonded to each other as a binder or a protective material between the metal nanoparticles, and the metal nanoparticles are not adhered to each other, and the metal nanoparticles are formed in the organic film formed from the binder.
- Dispersed film Dispersed film.
- the microstructure in which the metal nanoparticles are dispersed in the organic film is a structure in which the metal nanoparticles are three-dimensionally dispersed in the organic film, and is formed by vapor deposition in the above-described prior art.
- the thin film is greatly different from the microstructure in which metal fine particles are arranged two-dimensionally (planarly).
- the above-described forming method of the present invention is an extremely simple forming method in which an organic material in which metal nanoparticles are dispersed in a solvent is applied to the surface of a resin substrate and the solvent is volatilized. Compared to this method, the formation cost is remarkably low, the production time can be shortened, and the production yield is extremely high.
- the object on which the decorative film is formed is the surface of a resin sheet that is adhered to the surface of a resin substrate located in the radar apparatus path. Also good.
- resin sheet refers to a sheet whose adhesive surface is an adhesive tape or adhesive tape, or one that is adhered to an emblem or the like after an adhesive is applied to the adhesive surface of the sheet. Is included. And as a raw material of this resin sheet, PET, PMMA (polymethyl methacrylate), PEN, COP (cycloolefin polymer), polyamide etc. can be mentioned.
- the particle size range of the metal nanoparticles is a predetermined range from the viewpoint of the disappearance of metallic luster (the presence or absence of influence on the color tone) and the millimeter wave attenuation (attenuation rate). It is demonstrated that it is preferable to define the concentration of the metal nanoparticles in the organic film within a predetermined range.
- the term “particle diameter” as used herein refers to the maximum diameter in the case of various shapes other than the spherical shape, in addition to the diameter in the case where the metal nanoparticles are spherical or substantially spherical. This means, for example, the average particle diameter of the particle diameter measured in (1).
- 2 nm (nanometer) to 800 nm can be defined as the predetermined range.
- the thickness is less than 1 nm, the metallic luster disappears and a desired color tone cannot be obtained.
- the thickness exceeds 800 nm the millimeter-wave attenuation of individual metal nanoparticles increases, This is based on the finding that even if metal nanoparticles are dispersed, the millimeter wave attenuation rate exceeds 2 dB, which is a threshold value, and as a result, desired radio wave transmission cannot be obtained.
- the range of 2 to 15 nm is particularly desirable as the particle diameter range of the metal nanoparticles having a smaller millimeter wave attenuating property (attenuation rate) and more desirable within the above predetermined range. This is based on the reason that when the particle diameter of the metal nanoparticles is within this range, the millimeter wave attenuation (attenuation rate) is further reduced compared to, for example, a range exceeding 15 nm and 800 nm.
- millimeter wave refers to a radio wave having a frequency band of about 30 GHz to 300 GHz among electromagnetic waves. For example, about 76 GHz of the frequency band can be specified.
- the concentration range of the metal nanoparticles in the organic film it has been proved that it is preferable to define the predetermined range as 30 to 98% by weight. This is because when the amount is less than 30% by weight, the distance between the metal nanoparticles becomes too large, and the metallic luster disappears and a desired color tone cannot be obtained. As a result, the local metal continuous layer formed from the contacted metal nanoparticles causes the millimeter wave attenuation rate to exceed 2 dB.
- the thickness range of the decorative film can be determined from the viewpoint of whether or not the thickness of the decorative film can be formed by applying a forming method for applying an organic material and the millimeter wave attenuation (attenuation rate). It has been demonstrated that it is preferable to define the predetermined range, and specifically, the range of 0.05 to 40 ⁇ m is desirable. This is based on the finding that the thickness of the decorative film is less than 0.05 ⁇ m, that is, there is no practical method for applying an organic material in which metal nanoparticles are dispersed to a thickness of less than 0.05 ⁇ m. is there.
- the thickness of the decorative film exceeds 40 ⁇ m (when silver is used as the metal nanoparticles, the specific gravity of silver is 10.49, and the specific gravity of organic component in the organic film is 1; .3 ⁇ m) is based on the knowledge that, as a result of the millimeter wave attenuation rate exceeding 2 dB, the desired radio wave transmission cannot be obtained.
- the decorative coating according to the present invention is a decorative coating formed on the surface of the resin base located in the radar device path, or an adhesive sheet that is attached to the surface of the resin base located in the radar device path.
- This is a decorative film formed on the surface of the metal nanoparticle, which is made of an organic film in which metal molecules are dispersed, in which organic molecules coordinated around the metal nanoparticles bind to each other.
- the particle diameter of the metal nanoparticles is defined within the predetermined range, and / or the concentration of the metal nanoparticles in the decorative film is defined within the predetermined range, and / or Alternatively, the thickness of the decorative film is defined within the predetermined range described above.
- the decorative film can be formed by an extremely simple forming method.
- the cost can be remarkably reduced, the production time can be shortened, the production yield can be remarkably increased, and a decorative film having a desired metallic luster and an extremely low millimeter wave attenuation factor can be obtained.
- FIG. 1 is a longitudinal sectional view showing an embodiment of a decorative coating of the present invention directly formed on a resin base material, where millimeter waves irradiated from a radar device are emitted forward through the resin base material, It is the figure explaining the condition where the reflected light reflected by the thing is returning to the radar apparatus through the resin base material. It is the longitudinal cross-sectional view which expanded and showed the internal structure of the decorative film shown in FIG.
- FIG. 1 is a schematic diagram showing the relationship between a resin base material composed of a front grille and an emblem in front of a vehicle and a radar device disposed inside the vehicle behind the resin base material
- FIG. It is the longitudinal cross-sectional view which showed one embodiment of the formed decoration coating of this invention, Comprising: The millimeter wave irradiated from a radar apparatus was radiated
- 3 is an enlarged longitudinal sectional view showing the internal structure of the decorative coating shown in FIG.
- the decorative coating 10 of the present invention is, for example, the back surface (inside the vehicle) of the resin base material composed of the front grill 101 and the emblem 102 in front of the vehicle body 103, and is disposed inside the vehicle.
- the millimeter wave L1 irradiated from the radar apparatus 100 is irradiated forward through this resin base material, and the millimeter wave L2 returned by being reflected by a front object (for example, a forward vehicle) is similarly resin base material. Is formed in the passage route (radar device path) of the millimeter waves L1 and L2, which are captured by the radar device 100 via the.
- the decorative coating 10 is formed by dispersing metal nanoparticles 11 such as gold or an alloy thereof, silver or an alloy thereof, tin or an alloy thereof, indium or an alloy thereof in the organic film 12.
- gold nanoparticles with organic molecules coordinated around them are generated. Specifically, a 0.6 mM tetraoctyl ammonium bromide toluene solution (mM: millimolar) and a 0.3 mM chloroauric acid aqueous solution are mixed at a ratio of 2: 1 and stirred (generation of a first mixed solution). Next, 0.3 mM octadecanethiol is mixed at a ratio of 1: 6 with respect to the first mixed solution (generation of the second mixed solution). Subsequently, 300 mM sodium borohydride aqueous solution is mixed with this second mixed solution in a ratio of 1: 7, and after the reaction is completed, the toluene solution is subjected to liquid separation extraction.
- a 0.6 mM tetraoctyl ammonium bromide toluene solution mM: millimolar
- 0.3 mM chloroauric acid aqueous solution are mixed at a ratio
- An organic material in which gold nanoparticles (metal nanoparticles) are dispersed by adding and dispersing the gold nanoparticles coordinated around the organic molecules obtained as described above to toluene, which is a good solvent. Metal nanoparticle-dispersed organic film precursor
- the organic material is uniformly applied to the surface of the resin base material 101 by, for example, a bar coating method, and the solvent is volatilized in a high temperature atmosphere of about 80 to 100 ° C.
- An organic film 12 (decorative film 10) is formed by dispersing gold nanoparticles (metal nanoparticles 11) coordinated around.
- silver chloride in the generation process, an organic film in which silver nanoparticles are dispersed can be generated.
- FIG. 4 is a longitudinal sectional view showing another embodiment of the decorative coating of the present invention bonded to a resin base material, and millimeter waves irradiated from the radar device are emitted forward through the resin base material. It is the figure explaining the condition where the reflected light reflected by the front target object is returning to the radar apparatus through the resin base material.
- a decorative film 10A shown in FIG. 4 is a film in which a resin sheet 20 is previously provided on one surface of the decorative film 10 having the same internal structure as that in FIG. 3, and the resin sheet 20 is adhered or stuck to a resin base material. It is a form. That is, the decorative coating 10A is formed by being directly applied to the resin base material, whereas the decorative coating 10A is formed by being applied to the surface of the resin sheet 20, and the decorative coating 10A is formed on the resin base. It is bonded to the material.
- the resin sheet 20 can be formed of, for example, PET, PMMA (polymethyl methacrylate), PEN, COP (cycloolefin polymer), polyamide, or the like. Furthermore, there are a form in which an adhesive sheet is adhered to the resin substrate, a form in which the adhesive sheet is adhered to the adhesive surface via an adhesive, and the like.
- the following effects can be obtained by using the decorative coating 10A in which the decorative coating 10 is formed on the resin sheet 20.
- One effect is that a decorative film is formed on the resin substrate via a resin sheet, as compared with a method in which a metal nanoparticle-dispersed organic film precursor is applied directly to a resin substrate surface that is often uneven. Since it is formed, the effect is that it is easy to form a uniform decorative coating that follows this uneven shape.
- Another effect is that, for example, the stretchability and followability of the resin sheet are not impaired as compared with the conventional technique (dry method) in which a metal film is formed on the resin sheet by vapor deposition.
- the inventors of the present invention produced metal nanoparticles and an organic film precursor in which metal nanoparticles are dispersed by the following method, and formed various decorative films on a test piece of a resin base material (resin molded product). Attempts were made to test the upper and lower limits of the particle diameter of the metal nanoparticles, the concentration of the metal nanoparticles, and the thickness of the decorative coating.
- the method for producing metal nanoparticles is as described above. Specifically, a 0.6 mM tetraoctylammonium bromide toluene solution (mM: millimolar) and a 0.3 mM chloroauric acid aqueous solution were mixed at a ratio of 2: 1 and stirred to form a mixed solution, and then 0.3 mM octadecane Thiol is mixed with the mixture at a ratio of 1: 6 to form a separate liquid mixture, and then 300 mM aqueous sodium borohydride solution is mixed with the separate liquid mixture at a ratio of 1: 7. After completion of the reaction, the toluene solution is separated and extracted.
- a 0.6 mM tetraoctylammonium bromide toluene solution mM: millimolar
- a 0.3 mM chloroauric acid aqueous solution were mixed at a ratio of 2: 1 and stirred to form a mixed solution
- the above-mentioned toluene solution is dropped into ethanol, the precipitate is filtered through a membrane filter, and washed several times with ethanol, so that solid matter (gold nanoparticles with organic molecules coordinated around them) is obtained.
- the obtained gold nanoparticles were diluted and dispersed in toluene as a good solvent, dropped onto a microgrid and dried, and then the particle size was measured with a transmission electron microscope. In this measurement method, the diameter (maximum dimension) of 400 gold nanoparticles directly observed was measured and the average value thereof was 4 nm.
- the organic nanoparticles coordinated around the obtained organic nanoparticles are diluted with and dispersed in toluene as a good solvent, and an organic material in which the gold nanoparticles are dispersed (gold nanoparticle-dispersed organic film) Precursor).
- the gold concentration at this time was 60% by weight.
- the gold nanoparticle-dispersed organic film precursor described above is uniformly applied by a bar coating method onto a test piece made of a polycarbonate molded substrate (resin molded product) having a thickness of 3.5 mm, and a solvent is added at 80 to 100 ° C. Volatile removal was performed, and a decorative film formed by dispersing gold nanoparticles in an organic film was formed on a polycarbonate molded substrate.
- the above method was also performed on silver as metal nanoparticles, and a decorative film formed by dispersing silver nanoparticles in an organic film was also formed.
- TG-DTA measurement (TG: thermogravimetry) A method of measuring as a function of temperature and time DTA: A sample and a reference material are placed in the same furnace, for example, heated and cooled, and the temperature difference (DTA) between them is measured as a function of time and temperature. Therefore, TG-DTA is a simultaneous thermal analysis device that measures two types of information, TG and DTA at the same time, by a single measurement). The particle ratio was calculated.
- Table 1 shows the experimental results that serve as the basis for defining the upper and lower limits of the particle diameter of the metal nanoparticles
- Table 2 shows the experimental results that serve as the basis for defining the upper and lower limits of the metal concentration of the metal nanoparticles
- Table 3 The experimental results that are the basis for defining the upper and lower limits of the film thickness of the decorative coating are shown respectively.
- the metal thickness is converted with the specific gravity of silver being 10.49 and the specific gravity of an organic film other than silver being 1.
- Table 4 shows conditions relating to the metal compositions and metal particle diameters of Examples 1 to 3 and Comparative Examples
- Table 5 shows radio wave transmission loss measurement results and light transmittances of Examples and Comparative Examples of Table 4. Each result is shown.
- the radio wave transmission loss is measured at 76 GHz, which is an applied frequency of an in-vehicle millimeter wave radar. Furthermore, regarding the light transmittance, the light transmittance at a wavelength of 550 nm was measured using a visible ultraviolet spectrophotometer.
- the metallic luster disappears when the particle size of the metal nanoparticles is 1 nm or less. Therefore, from the viewpoint of color tone, when the particle size of the metal nanoparticles is 1 nm or less, it can be evaluated as NG. .
- the particle size of the metal nanoparticles exceeds 800 nm, the millimeter wave attenuation of each metal nanoparticle increases, and even if the particles are dispersed, the threshold value exceeds 2 dB.
- the range exceeding 800 nm can be evaluated as NG. Therefore, from this experiment, it was demonstrated that the particle diameter of the metal nanoparticles is preferably in the range of 2 to 800 nm.
- the millimeter wave attenuation is extremely small in the range of 2 to 800 nm described above, particularly in the range of 15 nm or less. Therefore, it was demonstrated that the particle diameter of the metal nanoparticles is preferably in the range of 2 to 800 nm, and in the range of 2 to 15 nm is desirable from the viewpoint of millimeter wave attenuation.
- the concentration of the metal nanoparticles in the decorative film is less than 30% by weight, the distance between the metal nanoparticles becomes too large, and as a result, the metallic luster disappears. From this point of view, this range can be evaluated as NG.
- the concentration of the metal nanoparticles in the decorative film is 99% by weight or more, the metal nanoparticles are in contact with each other, and a metal continuous layer is partially formed. Therefore, this range can be evaluated as NG. Therefore, it was demonstrated that the concentration of the metal nanoparticles in the decorative film is preferably in the range of 30 to 98% by weight.
- the metal thickness conversion when the metal is assumed to be a continuous layer with respect to the millimeter wave approach direction is in a range exceeding 2.3 ⁇ m (the range in which the decorative film thickness exceeds 40 ⁇ m).
- the thickness is desirably 0.05 ⁇ m or more. Therefore, it was proved that the thickness of the decorative film formed by dispersing metal nanoparticles in the organic film is preferably in the range of 0.05 to 40 ⁇ m.
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Abstract
Description
本発明者等は、以下の方法によって、金属ナノ粒子および金属ナノ粒子が分散してなる有機膜前駆体を生成し、樹脂基材(樹脂成形品)の試験片上に種々の装飾皮膜を形成し、金属ナノ粒子の粒子径、金属ナノ粒子の濃度、装飾皮膜の膜厚それぞれの上下限値を規定するための試験を試みた。
Claims (10)
- レーダ装置経路内に位置する樹脂基材の表面に装飾皮膜を形成する方法であって、
有機分子がその周囲に配位している金属ナノ粒子が溶媒内に分散してなる有機材料を生成し、樹脂基材の表面に該有機材料を塗布し、該溶媒を揮発させて、有機膜中に金属ナノ粒子が分散してなる装飾皮膜を形成する、装飾皮膜の形成方法。 - レーダ装置経路内に位置する樹脂基材表面に接着される、樹脂シートの表面に装飾皮膜を形成する方法であって、
有機分子がその周囲に配位している金属ナノ粒子が溶媒内に分散してなる有機材料を生成し、樹脂シートの表面に該有機材料を塗布し、該溶媒を揮発させて、有機膜中に金属ナノ粒子が分散してなる装飾皮膜を形成する、装飾皮膜の形成方法。 - 前記金属ナノ粒子の粒子径が2~800nmの範囲にある、請求項1または2に記載の装飾皮膜の形成方法。
- 形成される装飾皮膜中の金属ナノ粒子の濃度が30~98重量%の範囲となるように前記有機材料が調合されている、請求項1~3のいずれかに記載の装飾皮膜の形成方法。
- 厚みが0.05~40μmの前記装飾皮膜を形成する、請求項1~4のいずれかに記載の装飾皮膜の形成方法。
- レーダ装置経路内に位置する樹脂基材の表面に形成される装飾皮膜であって、
前記装飾皮膜は、金属ナノ粒子の周囲に配位している有機分子が該金属ナノ粒子同士をバインドしてなる、金属ナノ粒子が分散された有機膜からなり、
前記金属ナノ粒子の粒子径が2~800nmの範囲にある、装飾皮膜。 - レーダ装置経路内に位置する樹脂基材表面に接着される、樹脂シートの表面に形成される装飾皮膜であって、
前記装飾皮膜は、金属ナノ粒子の周囲に配位している有機分子が該金属ナノ粒子同士をバインドしてなる、金属ナノ粒子が分散された有機膜からなり、
前記金属ナノ粒子の粒子径が2~800nmの範囲にある、装飾皮膜。 - 前記金属ナノ粒子の粒子径が、2~15nmの範囲にある、請求項6または7に記載の装飾皮膜。
- 前記装飾皮膜中の金属ナノ粒子の濃度が30~98重量%の範囲にある、請求項6~8のいずれかに記載の装飾皮膜。
- 前記装飾皮膜の厚みが0.05~40μmとなっている、請求項6~9のいずれかに記載の装飾皮膜。
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JP2010541149A JPWO2010064285A1 (ja) | 2008-12-01 | 2008-12-01 | 装飾皮膜とその形成方法 |
PCT/JP2008/071765 WO2010064285A1 (ja) | 2008-12-01 | 2008-12-01 | 装飾皮膜とその形成方法 |
CN2008801321479A CN102227646A (zh) | 2008-12-01 | 2008-12-01 | 装饰被膜及其形成方法 |
EP08878547A EP2372387A4 (en) | 2008-12-01 | 2008-12-01 | DECORATIVE FILM AND METHOD FOR FORMING A DECORATIVE FILM |
KR1020117014744A KR20110099275A (ko) | 2008-12-01 | 2008-12-01 | 장식 피막과 그 형성 방법 |
US13/132,050 US20110236672A1 (en) | 2008-12-01 | 2008-12-01 | Decorative film and method for forming the same |
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KR (1) | KR20110099275A (ja) |
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KR20110099275A (ko) | 2011-09-07 |
US20110236672A1 (en) | 2011-09-29 |
JPWO2010064285A1 (ja) | 2012-04-26 |
EP2372387A1 (en) | 2011-10-05 |
CN102227646A (zh) | 2011-10-26 |
EP2372387A4 (en) | 2012-08-08 |
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