WO2014208183A1 - Procédé de fabrication d'un film de blindage d'onde électromagnétique - Google Patents

Procédé de fabrication d'un film de blindage d'onde électromagnétique Download PDF

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Publication number
WO2014208183A1
WO2014208183A1 PCT/JP2014/060960 JP2014060960W WO2014208183A1 WO 2014208183 A1 WO2014208183 A1 WO 2014208183A1 JP 2014060960 W JP2014060960 W JP 2014060960W WO 2014208183 A1 WO2014208183 A1 WO 2014208183A1
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Prior art keywords
refractive index
coating
bar
index layer
coating liquid
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PCT/JP2014/060960
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English (en)
Japanese (ja)
Inventor
川邉　茂寿
篤志 齋藤
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コニカミノルタ株式会社
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Priority to JP2015523902A priority Critical patent/JPWO2014208183A1/ja
Priority to CN201480036725.4A priority patent/CN105340375A/zh
Publication of WO2014208183A1 publication Critical patent/WO2014208183A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0094—Shielding materials being light-transmitting, e.g. transparent, translucent
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0088—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a plurality of shielding layers; combining different shielding material structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work

Definitions

  • the present invention relates to a method for producing an electromagnetic wave shielding film.
  • the electromagnetic wave shielding film is configured by alternately laminating high refractive index layers and low refractive index layers.
  • high refractive index layers and low refractive index layers increase, the reflectivity of electromagnetic waves increases and the shielding effect increases. Therefore, there is a problem in productivity (for example, see Patent Documents 1 and 2). Therefore, in order to improve productivity, application of a slide type die coater capable of performing multilayer coating (simultaneous multilayer coating) at once has been proposed.
  • the number of bars (number of coating layers) constituting the slide type die coater corresponds to the number of layers of the electromagnetic wave shielding film to be manufactured (number of high refractive index layers and low refractive index layers). Therefore, when increasing the number of coating layers in order to increase the number of layers of the electromagnetic shielding film to be manufactured, the number of bars installed increases, and the slide surface constituted by the end surfaces of the bars through which the coating liquid flows down becomes long. As a result, the flow of the coating liquid is likely to be disturbed, making uniform coating difficult, and mixing of the coating liquid may adversely affect the electromagnetic wave shielding film, for example, non-uniformity (fluctuation) in film thickness and performance. There was a risk of causing a drop.
  • the bar is pressurized and deformed from the higher pressure (the side through which the low refractive index layer coating solution having a higher viscosity passes) to the lower side (the side through which the high refractive index layer coating solution having a lower viscosity passes). Since the uniformity of the gap in the coating width direction is deteriorated, the coating film thickness becomes non-uniform, the uniformity of the optical characteristics of the electromagnetic wave shielding film to be manufactured is lowered, and, for example, the problem of color unevenness occurs.
  • the present invention has been made in order to solve the problems associated with the above-described conventional technology, and an object thereof is to provide a method for producing an electromagnetic wave shielding film capable of satisfactorily performing simultaneous multilayer coating even when the number of layers is increased.
  • the first coating liquid coating layer that constitutes the high refractive index layer and the second coating that constitutes the low refractive index layer is located between a tip portion that forms a gap with another adjacent bar, a base end portion that contacts the other bar, and the tip portion and the base end portion.
  • the pressure difference between the internal pressure of the concave portion of the pocket portion of the bar supplied with the second coating liquid and the internal pressure of the concave portion of the pocket portion of the bar supplied with the first coating liquid is 0.1 MPa.
  • Slit gap D 31 [mm] which is the thickness of the gap at the tip of the bar to which the first coating liquid is supplied and the slit which is the thickness of the gap at the tip of the bar to which the second coating liquid is supplied
  • the gap D 32 [mm] is 0.05 or more and 0.4 or less, and
  • the slit gap D 32 is the manufacturing method of the electromagnetic wave shielding film according to the slit gap D 31 is greater than the above (1).
  • Viscosity ⁇ 1 [mPa ⁇ s] of the first coating solution is 3 or more and 30 or less
  • Viscosity ⁇ 2 [mPa ⁇ s] of the second coating liquid is the method for producing an electromagnetic wave shielding film according to (2), which is 50 or more and 500 or less.
  • the thickness of the pocket portion of the bar is 15 mm or less, the bar can be thinned, and the end surface of the bar where the coating liquid flows down even when the number of installed bars (number of coating layers) is increased. It is suppressed that the slide surface comprised by becomes long.
  • the pressure difference between the internal pressure of the concave portion of the pocket portion of the bar supplied with the second coating liquid and the internal pressure of the concave portion of the pocket portion of the bar supplied with the first coating liquid is 0.1 MPa or less. It is set to be.
  • FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. It is sectional drawing for demonstrating the application
  • FIG. 1 is a flowchart for explaining a method of manufacturing an electromagnetic wave shielding film according to an embodiment of the present invention.
  • An electromagnetic wave shielding film is formed by alternately laminating a plurality of high refractive index layers and low refractive index layers, has high transmittance in the visible light region (wavelength 380 to 780 nm), and is near-red. It has optical characteristics with high reflectivity in the outside light region (780-2500 nm).
  • the electromagnetic wave shielding film is used as a near-infrared light reflecting film, and is disposed in an outdoor window of a building, an automobile window, an agricultural greenhouse, and the like, and is used for imparting a heat ray reflecting effect.
  • High refractive index layer and “low refractive index layer” when comparing the refractive index difference between two adjacent layers, the higher refractive index layer is the high refractive index layer, the lower one is the low refractive index layer Means.
  • the reflectance in the specific wavelength region is determined by the refractive index difference between two adjacent layers and the number of layers. The larger the refractive index difference, the higher the reflectance can be obtained with a smaller number of layers.
  • the method for manufacturing an electromagnetic wave shielding film according to the embodiment of the present invention includes a preparation step, a coating step, and a drying step, as shown in FIG.
  • a high refractive index layer coating solution and a low refractive index layer coating solution are prepared by mixing metal oxide particles, a resin binder, a curing agent, an additive, a solvent, and the like.
  • the high refractive index layer coating liquid and the low refractive index layer coating liquid corresponding to each layer of the electromagnetic wave shielding film are collectively coated (simultaneous multilayer coating) on the film substrate.
  • polyolefin film As the film substrate, various resin films such as polyolefin film, polyester film, polyvinyl chloride film, and cellulose acetate film can be applied.
  • Polyolefin is, for example, polyethylene or polypropylene.
  • polyester examples include polyethylene terephthalate and polyethylene naphthalate.
  • an electromagnetic wave shielding film is produced by drying (thermosetting) the film substrate on which the high refractive index layer coating solution and the low refractive index layer coating solution are applied in multiple layers.
  • the drying conditions are appropriately set in consideration of the evaporation temperature of the volatile components contained in the high refractive index layer coating solution and the low refractive index layer coating solution, the curing temperature of the curing agent, the heat resistant temperature of the film substrate, and the like. .
  • the dried electromagnetic shielding film is then cut into an appropriate size as necessary.
  • the metal oxide particles of the high refractive index layer coating liquid are, for example, titanium dioxide, zirconium oxide, zinc oxide, alumina, colloidal alumina, lead titanate, red lead, yellow lead, zinc yellow, chromium oxide, second oxide. They are iron, iron black, copper oxide, magnesium oxide, magnesium hydroxide, strontium titanate, yttrium oxide, niobium oxide, europium oxide, lanthanum oxide, zircon and tin oxide.
  • the metal oxide particles of the high refractive index layer coating solution preferably contain titanium oxide fine particles and zirconia oxide fine particles. The concentration of the metal oxide particles is, for example, 1 to 50% by mass.
  • the metal oxide particles of the low refractive index layer coating solution are, for example, silicon dioxide and colloidal silica.
  • the concentration of the metal oxide particles is, for example, 1 to 50% by mass.
  • Resin binders are, for example, polyvinyl alcohol, gelatin, water-soluble cellulose derivatives, thickening polysaccharides, and polymers having reactive functional groups.
  • concentration of the resin binder in the high refractive index layer coating solution is, for example, 0.5 to 10% by mass.
  • concentration of the resin binder in the low refractive index layer coating solution is 1 to 10% by mass.
  • the curing agent is not particularly limited as long as it causes a curing reaction with the resin binder.
  • the curing agent is, for example, boric acid and its salt.
  • Additives are, for example, ultraviolet absorbers, fading inhibitors, surfactants, fluorescent brighteners, pH adjusters, antifoaming agents, lubricants, preservatives, and antistatic agents.
  • the solvent is, for example, water, an organic solvent, or a mixed solution thereof.
  • the organic solvent is methanol, ethanol, ethyl acetate or the like.
  • FIG. 2 is a schematic view for explaining a coating apparatus applied to the preparation step and the coating step shown in FIG. 1
  • FIG. 3 is a plan view for explaining a side wall portion of the die coater shown in FIG. 4 is a plan view for explaining the bar of the die coater shown in FIG. 2
  • FIG. 5 is a cross-sectional view taken along line VV in FIG.
  • the coating apparatus 10 includes a transport system 20, a die coater 30, a coating liquid supply system 70, and pressure sensors 81 and 82.
  • the conveyance system 20 includes a film base material 22 and a back roll 24.
  • the film substrate 22 is a belt-like support on which the coating liquid L is applied.
  • the back roll 24 is arranged inside the film base 22 and is configured to transport the film base 22 from the upstream side to the downstream side in the application direction (transport direction) F by being driven to rotate. ing.
  • the film base material 22 is heated up to predetermined temperature (for example, 30 degreeC or more) by a heating means (not shown).
  • the die coater 30 is a slide type, and is configured such that coating layers corresponding to the layers of the electromagnetic wave shielding film can be collectively applied (simultaneous multilayer coating). Have.
  • the stacked body 32 is configured by stacking a plurality of rectangular bars 40 in order.
  • the bar 40 is made of, for example, stainless steel, and includes a front bar 42, a plurality of intermediate bars 44, and a back bar 46, which have substantially the same shape.
  • the front bar 42 is a bar that occupies the lowermost layer of the laminate 32 and is positioned in the vicinity of the film substrate 22.
  • the back bar 46 is a bar that occupies the uppermost layer of the stacked body 32.
  • the intermediate bar 44 is a bar that occupies an intermediate layer located between the front bar 42 and the back bar 46.
  • the side wall part 60 is arrange
  • the constituent material of the bar 40 is not limited to stainless steel.
  • the application width direction W is orthogonal to the application direction (conveyance direction) F.
  • the bar 40 has a proximal end portion 50, a pocket portion 53, and a distal end portion 56 in order from the proximal end side.
  • the base end portion 50 has a through hole 52 communicating with the coating liquid supply system 70.
  • the through hole 52 is located in the center of the application width direction W of the base end portion 50 and extends from the end surface of the base end portion 50 toward the pocket portion 53.
  • a thickness D 1 of the proximal end portion 50 is set to be larger than a thickness D 2 of the distal end portion 56. Therefore, when the bars 40 are stacked, the base end portion 50 comes into contact with the base end portion 50 of another adjacent bar, while the front end portion 56 and the front end portion 56 of another adjacent bar are in between.
  • a slit (gap) 58 having a thickness D 3 ( D 1 ⁇ D 2 ) is formed. In the following, the thickness D 3 are referenced by the slit spacing D 3.
  • Reference numeral 51 denotes an end face of the base end portion 50.
  • the slit 58 functions as a passage through which the coating liquid passes. Since the coating liquid discharged from the front end of the slit 58 flows down the end surface 57 of the front end portion 56, the end surface 57 functions as a slide surface on which the coating liquid flows down.
  • the pocket portion 53 has a concave portion 54 formed to extend in the coating width direction W of the bar 40.
  • the recess 54 is a coating liquid reservoir that communicates with the slit 58 and the through hole 52.
  • the concave portion 54 is used to spread the coating liquid from the through-hole 52 (coating liquid supply system 70) evenly in the coating width direction W and stably supply it to the slit 58.
  • the thickness D 4 of the pocket portion 53 is set to 15mm or less. Therefore, it is possible to make the bar 40 thinner (thinner and lighter), and even if the number of installed bars 40 (the number of coating layers) is increased, an increase in the sliding surface is suppressed.
  • the die coater 30 can be reduced in size, space-saving, energy saving, equipment cost can be reduced, handling can be facilitated, workability can be improved, and coating failure can be expected.
  • the high-refractive index layer coating solution L 1 which is a first coating liquid constitutes the high refractive index layer and the low refractive index layer and thus the second coating liquid and the low-refractive index layer coating solution L 2, but are alternately introduced.
  • the low refractive index layer coating liquid L 2 is introduced into the through hole 52 of the front bar 42, and the high refractive index layer coating liquid L 1 is introduced into the through hole of the intermediate bar 44 adjacent to the front bar 42.
  • the through hole 52 of another intermediate bar 44 adjacent to the intermediate bar 44, the low refractive index layer coating solution L 2 is introduced.
  • the number of slits 58 is equal to the number of layers of the manufactured electromagnetic shielding film, and the number of intermediate bars 44 is adjusted according to the number of layers of the manufactured electromagnetic shielding film.
  • the sliding surface is the sum of the length of the end surface 57 of the front end portion 56 of the intermediate bar 44 and the front bar 42 in which two or more layers are stacked, and the thickness of the intermediate bar 44 excluding the uppermost layer and the front bar 42 It almost coincides with the total thickness.
  • Coating liquid supply system 70 is used to provide a low refractive index layer coating solution L 2 and the high-refractive index layer coating solution L 1 die coater 30, the preparation kettle 72 and 76, It has piping systems 73 and 77 and pumps 74 and 78.
  • Preparation kettle 72 a low refractive index layer coating solution L 2 is prepared, a predetermined temperature (e.g., 30 ° C. or higher) is a vessel used to hold in.
  • the piping system 73 connects the preparation kettle 72 and the through hole 52 of the base end portion 50 of the bar 40 for the low refractive index layer coating solution.
  • the pump 74 is used for pumping the prepared low refractive index layer coating liquid L 2 through the piping system 73.
  • Preparation kettle 76 the high refractive index layer coating solution L 1 was prepared, a predetermined temperature (e.g., 30 ° C. or higher) is a vessel used to hold in.
  • the piping system 77 connects the preparation pot 76 and the through hole 52 of the base end portion 50 of the bar 40 for the high refractive index layer coating solution.
  • Pump 78 via the piping system 77 is used which is prepared a high refractive index layer coating solution L 1 for pumping.
  • the pumps 74 and 78 are, for example, gear pumps or tube pumps.
  • the pressure sensors 81 and 82 are disposed in the piping systems 73 and 77 in the vicinity of the die coater 30 and are used for detecting a pressure difference. Pressure differential is detected, and the internal pressure of the recess 54 of the pocket portion 53 of the bar 40 having a low refractive index layer coating solution L 2 is supplied, the pocket section 53 of the bar 40 to the high refractive index layer coating solution L 1 is supplied Is set to be 0.1 MPa or less in the coating step.
  • the pressure sensors 81 and 82 can be disposed on the inner surface of the concave portion 54 of the pocket portion 53 or on the inner surface of the side wall portion 60 in contact with the concave portion 54 of the pocket portion 53, for example.
  • the pressure difference can also be detected directly by a differential pressure gauge.
  • FIG. 6 is a cross-sectional view for explaining a coating process according to an embodiment of the present invention
  • FIG. 7 is a cross-sectional view for explaining a coating condition in the coating process
  • FIG. 8 is for explaining a comparative example. It is sectional drawing.
  • the metal oxide particles for low refractive index layer, the resin binder, a curing agent, additives, solvents and the like after turning the preparation kettle 72, by mixing, the low refractive index layer coating solution L 2 while being prepared, the metal oxide particles for high refractive index layer, the resin binder, a curing agent, additives, solvents and the like, after turning the preparation kettle 76, by mixing, the high refractive index layer coating solution L 1 Prepared. Then, the low refractive index layer coating solution L 2 and the high-refractive index layer coating solution L 1 which is prepared is held at a predetermined temperature (e.g., 30 ° C. or higher).
  • a predetermined temperature e.g. 30 ° C. or higher.
  • the prepared low refractive index layer coating liquid L 2 and high refractive index layer coating liquid L 1 are pumped by pumps 74 and 78, and are connected to the low refractive index layer coating liquid via the piping systems 73 and 77.
  • the through hole 52 of the base end portion 50 of the bar 40 for use and the through hole 52 of the base end portion 50 of the bar 40 for the high refractive index layer coating solution are pumped by pumps 74 and 78, and are connected to the low refractive index layer coating liquid via the piping systems 73 and 77.
  • the high refractive index layer coating liquid L 1 and the low refractive index layer coating liquid L 2 are alternately introduced into the through holes 52 of the bar 40 according to the stacking position of the bars 40. Is done.
  • the low refractive index layer coating liquid L 2 is introduced into the through hole 52 of the front bar 42, and the high refractive index layer coating liquid L 1 is introduced into the through hole of the intermediate bar 44 adjacent to the front bar 42.
  • the through hole 52 of another intermediate bar 44 adjacent to the intermediate bar 44 the low refractive index layer coating solution L 2 is introduced.
  • the coating solution is spread evenly in the coating width direction W in the concave portion 54 of the pocket portion 53 and introduced into the slit 58.
  • the coating solution that has passed through the slit 58 flows down the end surface 57 of the tip portion 56 of the bar 40 and flows down the end surface 57 of the tip portion 56 of another bar 40 positioned below. And overlap one after another.
  • the coating liquid which flows down is comprised from the layer corresponding to the number of layers of the electromagnetic wave shielding film manufactured at the time of overlapping with the coating liquid which passed the slit 58 of the front bar 42.
  • the coating liquid L flows away (applied) to the film base material 22 that has been heated to a predetermined temperature (for example, 30 ° C. or more) apart from the front bar 42 that is the lowermost bar 40.
  • the thickness D 4 of the pocket portion 53 of the bar 40 is set to 15mm or less, a bar 40 which is thinner, even increasing installation speed of the bar 40 (the number of coating layer), the slide surface is long Is suppressed.
  • the viscosity ⁇ 1 of the high refractive index layer coating liquid L 1 is 3 mPa ⁇ s or more and 30 mPa ⁇ s or less.
  • the viscosity ⁇ 2 of the low refractive index layer coating liquid L 2 is 50 mPa ⁇ s or more and 500 mPa ⁇ s or less, which is one digit or more larger than the viscosity ⁇ 1 of the high refractive index layer coating liquid L 1 . Therefore, the internal pressure P 1 of the concave portion 54 to which the high refractive index layer coating liquid L 1 is supplied is smaller than the internal pressure P 2 of the concave portion 54 to which the low refractive index layer coating liquid L 2 is supplied, and is adjacent (adjacent). An internal pressure difference occurs between the bars 40.
  • the pressure difference ⁇ P between the internal pressure P 1 of the recess 54 of the pocket portion 53 of the bar 40 to which the rate layer coating liquid L 1 is supplied is set to be 0.1 MPa or less.
  • the pressure difference ⁇ P related to the pocket portion 53 that is the minimum thickness portion of the bar 40 and easily deforms due to the pressure is small, the deformation of the bar 40 is suppressed, and the uniformity of the gap in the coating width direction is maintained. Since the coating film thickness in the coating width direction is prevented from becoming non-uniform, the uniformity of the optical characteristics of the manufactured electromagnetic wave shielding film is good. That is, even when the number of layers is increased, simultaneous multilayer coating can be carried out satisfactorily.
  • the high refractive index layer coating liquid L 1 , the low refractive index layer coating liquid L 2 and the film substrate 22 are heated during coating. Therefore, the high refractive index layer coating liquid L 1 and the low refractive index layer coating liquid L 2 applied to the film base material 22 are once cooled to 1 to 15 ° C. and then put into a drying step, and 10 ° C. or higher. For example, drying is performed at a wet bulb temperature of 5 to 50 ° C. and an application surface temperature of 10 to 50 ° C.
  • FIG. 9 is a table showing test results for explaining the influence of the thickness of the bar pocket portion and the pressure difference on the film thickness fluctuation rate of the electromagnetic wave shielding film
  • FIG. 10 shows the film thickness fluctuation rate of the electromagnetic wave shielding film
  • FIG. 11 is a table showing test results for explaining the influence of the slit interval on the film thickness variation rate of the electromagnetic wave shielding film.
  • FIG. 11 is a table showing the test results for explaining the influence of the coating liquid viscosity on the pressure difference. It is.
  • the coating solution for the low refractive index layer is composed of 12 parts by mass of colloidal silica (Snowtex OXS, manufactured by Nissan Chemical Industries, Ltd., solid content 10% by mass), polyvinyl alcohol (PVA-103, polymerization degree 300, saponification degree 98.5 mol%, 2 parts by weight of a 5% by weight aqueous solution of Kuraray Co., Ltd. and 10 parts by weight of a 3% by weight aqueous boric acid solution were added, and the mixture was then heated to 45 ° C. and stirred while polyvinyl alcohol (PVA-117, polymerization degree 1700).
  • colloidal silica Snowtex OXS, manufactured by Nissan Chemical Industries, Ltd., solid content 10% by mass
  • PVA-103 polyvinyl alcohol
  • PVA-103 polymerization degree 300, saponification degree 98.5 mol%
  • the coating solution for the high refractive index layer is 5 parts of polyvinyl alcohol (PVA-103, polymerization degree 300, saponification degree 98.5 mol%, manufactured by Kuraray Co., Ltd.) in 30 parts by mass of silica-attached titanium dioxide sol (solid content 20.0% by mass). After adding 2 parts by weight of a 2% by weight aqueous solution, 10 parts by weight of a 3% by weight aqueous boric acid solution, and 10 parts by weight of a 2% by weight aqueous citric acid solution, the mixture was heated to 45 ° C.
  • PVA-103 polyvinyl alcohol
  • silica-attached titanium dioxide sol solid content 20.0% by mass
  • polyvinyl alcohol PVA- 617, polymerization degree 1700, saponification degree 95.0 mol%, manufactured by Kuraray Co., Ltd.
  • PVA- 617 polyvinyl alcohol
  • surfactant Rapizole A30, manufactured by NOF Corporation
  • the silica-attached titanium dioxide sol is composed of 15.0 mass% titanium oxide sol (SRD-W, volume average particle size 5 nm, rutile titanium dioxide particles, manufactured by Sakai Chemical Co., Ltd.) 0.5 mass parts, and 2 mass parts of pure water.
  • SRD-W volume average particle size 5 nm, rutile titanium dioxide particles, manufactured by Sakai Chemical Co., Ltd.
  • aqueous silicic acid solution a solution of sodium silicate 4 (manufactured by Nippon Chemical Co., Ltd.) diluted with pure water so that the SiO 2 concentration was 2.0 mass
  • heat treatment was performed at 175 ° C. for 18 hours in an autoclave. After cooling, the solution was concentrated by an ultrafiltration membrane.
  • the low-refractive index layer coating solution and the high-refractive index layer coating solution were kept at 45 ° C. and supplied to the die coater, and 15 layers were simultaneously coated.
  • the lowermost layer and the uppermost layer are low refractive index layers, and one low refractive index layer is included more than the high refractive index layer.
  • the film substrate was formed of a polyethylene terephthalate film (Toyobo Co., Ltd. A4300: double-sided easy-adhesion layer) having a thickness of 50 ⁇ m and a width of 2000 mm, and the temperature was raised to 45 ° C. during application of the coating solution.
  • the front bar and back bar of the die coater were 40 mm thick.
  • the coating speed and coating width were set to 50 m / min and 1950 mm.
  • the coating thickness of the low refractive index layer and the high refractive index layer was set to be 150 nm as an average film thickness during drying.
  • the film thickness fluctuation rate V [%] of the electromagnetic wave shielding film is a value obtained by dividing the film thickness fluctuation width by the film thickness average value and multiplying by 100.
  • the film thickness variation width is a difference between the minimum value and the maximum value of the film thickness.
  • the film thickness average value is an average value related to the entire width of the film thickness measured at intervals of 50 mm in the coating width direction.
  • the film thickness was measured for each layer.
  • a cross section of the electromagnetic wave shielding film manufactured under the above conditions can be observed with a length of 1 cm under the condition of an acceleration voltage of 2.0 kV using an electron microscope (FE-SEM, S-5000H type, manufactured by Hitachi, Ltd.).
  • FE-SEM, S-5000H type manufactured by Hitachi, Ltd.
  • the film thickness is an average value of 1000 measurement results.
  • the thickness D 4 of the pocket portion of the bars varied from 5 ⁇ 20 mm, and the pressure difference ⁇ P is in a range of 0.02 ⁇ 0.15 MPa by changing the supply amount of the low refractive index layer coating solution L 2 Changed.
  • the pressure difference ⁇ P is, the internal pressure P 2 of the recess of the pocket portion of the bar having a low refractive index layer coating solution L 2 is supplied, the recess of the pocket portion of the bar which high refractive index layer coating solution L 1 is supplied internal pressure P 1 and the pressure difference.
  • the slit gap was 0.2 mm, and the viscosity of the high refractive index layer coating solution and the low refractive index layer coating solution was set to 10 mPa ⁇ s and 100 mPa ⁇ s.
  • the thickness D 4 of the pocket portion of the bar is 20 mm, regardless of the pressure difference [Delta] P, the coating disturbance was observed.
  • the thickness D 4 of the pocket portion of the bar is 15mm or less, and, when the pressure difference ⁇ P is 0.1MPa or less, the coating film disturbance is not observed, the thickness variation rate (V) is 3.0% The following uniform coating film could be obtained.
  • the thickness D 4 of the pocket portion of the bar is preferably at least 5 mm.
  • the low refractive index layer coating solution viscosity ⁇ 2 was changed in the range of 50 to 2000 mPa ⁇ s, and the high refractive index layer coating solution viscosity ⁇ 1 was changed in the range of 1 to 30 mPa ⁇ s.
  • the thickness D 4 of the pocket portion of the bar 12,5Mm, slit gap D 3 was set to 0.2 mm.
  • the adjustment method of a viscosity is not specifically limited, For example, it can adjust by changing the ratio of a solvent and a binder.
  • the film thickness variation rate (V) exceeds 3.0% and the film thickness variation rate (V) is 3.0% or less.
  • the pressure difference ⁇ P was 0.1 MPa or less.
  • the slit gap D 31 of the slit 58 through which the high refractive index layer coating liquid L 1 passes is changed in the range of 0.04 to 0.3 mm, and the slit of the slit 58 through which the low refractive index layer coating liquid L 2 passes.
  • gap D 32 was changed in the range of 0.15 ⁇ 0.5 mm.
  • the thickness D 4 of the pocket portion of the bars, 12.5 mm, the high-refractive index layer coating solution viscosity mu 1 and the low refractive index layer coating solution viscosity mu 2 was set to 10 mPa ⁇ s and 100 mPa ⁇ s.
  • the slit gaps D 31 and D 32 are 0.05 mm or more and 0.4 mm or less and the slit gap D 32 is larger than the slit gap D 31 , the film thickness variation rate A uniform coating film having (V) of 3.0% or less could be obtained.
  • the slit gap D 32 is, if more than five times the slit gap D 31, the pressure loss is too small, there is a possibility that the low refractive index layer coating solution L 2 is not uniformly flow out across the coating width. Therefore, the slit gap D 32 is preferably not more than 5 times the slit gap D 31.
  • the slit gap D 31 of the slit 58 the high refractive index layer coating solution L 1 passes is 0.05 mm
  • the film thickness variation rate (V) is 3.0% or less but exceeds 1.0%. This is because when the slit gap D 31 is 0.05 mm, is because it was difficult to manufacture a uniform slit in the coating width direction.
  • the slit gap D 32 of the slit 58 having a low refractive index layer coating solution L 2 passes is 0.4 mm
  • the slit gap D 31 of the slit 58 that passes through the high-refractive index layer coating solution L 1 is 0.05 to 0
  • the film thickness variation rate (V) is 3.0% or less, but exceeds 1.0%. This is because the slit gap D 32 is too narrow, the pressure loss generated when the low refractive index layer coating solution L 2 passes becomes excessively small, is because the coating solution is no longer uniformly flows out across the coating width .
  • the thickness of the pocket portion of the bar is 15 mm or less, the bar can be thinned, and even if the number of installed bars (number of coating layers) is increased, the coating solution It is suppressed that the slide surface comprised by the end surface of the bar
  • the pressure difference between the internal pressure of the concave portion of the pocket portion of the bar supplied with the second coating liquid and the internal pressure of the concave portion of the pocket portion of the bar supplied with the first coating liquid is 0.1 MPa. It is set to be as follows.
  • the electromagnetic wave shielding film can be applied to a far-infrared reflective film or an ultraviolet reflective film.
  • it is designed to reflect visible light or ultraviolet light instead of near-infrared light by adjusting the optical film thickness of the high refractive index layer and the low refractive index layer that are alternately stacked.
  • the structure in which the high refractive index layer and the low refractive index layer are alternately laminated is, for example, on the other surface of the film substrate after the simultaneous multilayer coating is performed on one surface of the film substrate and dried. It is also possible to arrange on both surfaces of the electromagnetic wave shielding film by performing simultaneous multilayer coating and drying.
  • a high refractive index layer is arranged on the lowermost layer and the uppermost layer of a structure in which a high refractive index layer and a low refractive index layer are alternately stacked, and the number of high refractive index layers to be installed is larger than that of the low refractive index layer. Is also possible. It is also possible to make the number of low refractive index layers and high refractive index layers the same.
  • a layer having another function between the film base and the coating layer or on the surface of the coating layer It is possible to arrange a layer having another function between the film base and the coating layer or on the surface of the coating layer. For example, it is possible to dispose a gas barrier layer or an easy-adhesion layer between the film substrate and the coating layer, or to dispose a hard coat layer or an abrasion-resistant layer on the surface of the coating layer.
  • 10 coating device 20 transport system, 22 film substrate, 24 Backroll, 30 Die coater, 32 laminates, 40 bars, 42 Front bar, 44 middle bar, 46 Backbar, 50 proximal end, 51 end face, 52 through holes, 53 pocket part 54 recess, 56 tip, 57 end face, 58 slits, 60 side wall, 70 coating solution supply system, 72 preparation kettle, 73 Piping system, 74 pumps, 76 Preparation kettle, 77 Piping system, 78 pump, 81,82 pressure sensor, D 1 , D 2 , D 3 , D 31 , D 32 , D 4 thickness, F coating direction, L, L 1 , L 2 coating solution, W coating width direction, ⁇ 1, ⁇ 2 Viscosity.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Optical Filters (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

Le problème décrit par la présente invention est de proposer un procédé de fabrication d'un film de blindage d'onde électromagnétique permettant une bonne application par couches simultanées, même lorsque le nombre de couches augmente. La solution de l'invention porte sur un procédé de fabrication d'un film de blindage d'onde électromagnétique qui présente une structure dans laquelle des couches à indice de réfraction élevé et des couches à bas indice de réfraction sont appliquées alternativement, le procédé comportant une étape de revêtement au cours de laquelle une couche de revêtement d'un premier liquide de revêtement (L1) qui constitue une couche à indice de réfraction élevé et une couche de revêtement d'un second liquide de revêtement (L2) qui constitue une couche à bas indice de réfraction sont appliquées alternativement à l'aide d'une coucheuse à filière de type coulissante comprenant une pluralité de barres stratifiées (40), de telle sorte qu'un substrat de film est enduit simultanément avec les couches. Les barres (40) comprennent les éléments suivants : une section d'extrémité (56) qui forme un espace (58) avec les autres barres adjacentes (40) ; une section de base (50) qui est en contact avec d'autres barres (4) ; et une section de poche (53) positionnée entre la section d'extrémité (56) et la section de base (50), et qui présente une section en retrait (54) qui est une section de réservoir de fluide de revêtement. L'épaisseur (D4) de la section de poche (53) est inférieure ou égale à 15 mm, et durant l'étape de revêtement, la différence de pression (ΔP) entre la pression intérieure (P2) de la section en retrait (54) de la section de poche (53) de la barre (40) à laquelle est fourni le second fluide de revêtement (L(2) et la pression intérieure (P1) de la section en retrait (54) de la section de poche (53) de la barre (40) à laquelle est fourni le premier fluide de revêtement (L(1) est réglée de manière à ne pas dépasser 0,1 MPa.
PCT/JP2014/060960 2013-06-28 2014-04-17 Procédé de fabrication d'un film de blindage d'onde électromagnétique WO2014208183A1 (fr)

Priority Applications (2)

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JP2015523902A JPWO2014208183A1 (ja) 2013-06-28 2014-04-17 電磁波遮蔽フィルムの製造方法
CN201480036725.4A CN105340375A (zh) 2013-06-28 2014-04-17 电磁波屏蔽膜的制造方法

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JP2013-137068 2013-06-28
JP2013137068 2013-06-28

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WO2014208183A1 true WO2014208183A1 (fr) 2014-12-31

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08266978A (ja) * 1995-03-31 1996-10-15 Fuji Photo Film Co Ltd 塗布装置及び塗布方法
JP2003010762A (ja) * 2001-06-28 2003-01-14 Konica Corp 塗布装置及び塗布方法
JP2003126761A (ja) * 2001-10-29 2003-05-07 Konica Corp 塗布方法
JP2009295980A (ja) * 2008-06-02 2009-12-17 Dongjin Semichem Co Ltd 電磁波遮蔽用フィルターとその製造方法、および表示装置
JP2012150226A (ja) * 2011-01-18 2012-08-09 Dainippon Printing Co Ltd 反射防止フィルム、反射防止フィルムの製造方法及び画像表示装置
JP2012183452A (ja) * 2011-03-03 2012-09-27 Fujifilm Corp 積層フィルムの製造方法
JP2013000667A (ja) * 2011-06-17 2013-01-07 Konica Minolta Holdings Inc 赤外遮蔽フィルムの製造方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1997460A (zh) * 2004-06-17 2007-07-11 富士胶片株式会社 涂膜的制备方法、抗反射薄膜及其制备方法、使用该膜的偏振片和图像显示装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08266978A (ja) * 1995-03-31 1996-10-15 Fuji Photo Film Co Ltd 塗布装置及び塗布方法
JP2003010762A (ja) * 2001-06-28 2003-01-14 Konica Corp 塗布装置及び塗布方法
JP2003126761A (ja) * 2001-10-29 2003-05-07 Konica Corp 塗布方法
JP2009295980A (ja) * 2008-06-02 2009-12-17 Dongjin Semichem Co Ltd 電磁波遮蔽用フィルターとその製造方法、および表示装置
JP2012150226A (ja) * 2011-01-18 2012-08-09 Dainippon Printing Co Ltd 反射防止フィルム、反射防止フィルムの製造方法及び画像表示装置
JP2012183452A (ja) * 2011-03-03 2012-09-27 Fujifilm Corp 積層フィルムの製造方法
JP2013000667A (ja) * 2011-06-17 2013-01-07 Konica Minolta Holdings Inc 赤外遮蔽フィルムの製造方法

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CN105340375A (zh) 2016-02-17

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