WO2002034687A1 - Light-transmitting substrate, process for producing the same, and building and vehicle - Google Patents

Light-transmitting substrate, process for producing the same, and building and vehicle Download PDF

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Publication number
WO2002034687A1
WO2002034687A1 PCT/JP2001/009193 JP0109193W WO0234687A1 WO 2002034687 A1 WO2002034687 A1 WO 2002034687A1 JP 0109193 W JP0109193 W JP 0109193W WO 0234687 A1 WO0234687 A1 WO 0234687A1
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WO
WIPO (PCT)
Prior art keywords
silica
substrate according
light
group
water
Prior art date
Application number
PCT/JP2001/009193
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
Kazufumi Ogawa
Norihisa Mino
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to AU2001295975A priority Critical patent/AU2001295975A1/en
Publication of WO2002034687A1 publication Critical patent/WO2002034687A1/ja

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60SSERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00Cleaning of vehicles
    • B60S1/02Cleaning windscreens, windows or optical devices
    • B01J35/30
    • B01J35/39
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/42Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating of an organic material and at least one non-metal coating
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00Coatings on glass
    • C03C2217/40Coatings comprising at least one inhomogeneous layer
    • C03C2217/43Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase
    • C03C2217/46Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase
    • C03C2217/47Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase consisting of a specific material
    • C03C2217/475Inorganic materials
    • C03C2217/477Titanium oxide
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00Coatings on glass
    • C03C2217/70Properties of coatings
    • C03C2217/71Photocatalytic coatings
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00Coatings on glass
    • C03C2217/70Properties of coatings
    • C03C2217/75Hydrophilic and oleophilic coatings
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00Coatings on glass
    • C03C2217/70Properties of coatings
    • C03C2217/76Hydrophobic and oleophobic coatings
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2218/00Methods for coating glass
    • C03C2218/30Aspects of methods for coating glass not covered above
    • C03C2218/365Coating different sides of a glass substrate

Definitions

  • the present invention relates to a light-transmitting substrate such as a glass plate or a plastic plate having a water- and oil-repellent coating on one surface and a hydrophilic coating on the other surface, a method for producing the same, and a building and a vehicle using the same. It is about. More specifically, the present invention relates to an invention in which a base (undercoat) layer is provided on the surface of a substrate, and a water / oil repellent coating or a hydrophilic and antifogging coating is provided thereon.
  • window glass for buildings and vehicles has been required to have an ultra-thin coating that is transparent, heat-resistant, weather-resistant, and abrasion-resistant and has water-repellent, anti-fog, and anti-fouling functions.
  • an alkoxysilane or chlorosilane containing a fluorocarbon (fluorocarbon) group is applied, and after drying, baking (baking or baking treatment) is performed at about 300 ° C for about 1 hour.
  • baking baking or baking treatment
  • a titanium oxide fine particle having a photocatalytic function as disclosed in Japanese Patent Application Laid-Open No. 09 (1997)- There is known a method of dispersing, coating and baking.
  • the method of burning fluorocarbon polymer is When used on both sides of windows of objects and vehicles, the coating is water-repellent, so when raindrops fall on the outside, waterdrops can be repelled to improve visibility, but conversely, the inside tends to become cloudy and visibility is poor. Become.
  • the coating becomes hydrophilic, so that the fogging can be improved in the inward direction. It gets wet and visibility deteriorates.
  • the conventional method of applying a photocatalyst has a problem that the durability is short and the photocatalyst is peeled off in a few months.
  • a first object of the present invention is to improve and improve the visibility of windows of buildings and vehicles in rainy weather in order to solve the conventional problems.
  • a second object of the present invention is to improve the durability of the photocatalyst layer.
  • the light-transmitting substrate of the present invention has a light-transmitting substrate in which one surface is covered with a water-repellent and oil-repellent film and the other surface is covered with a hydrophilic and anti-fog film.
  • the method for producing a light-transmitting substrate according to the present invention is directed to a method for manufacturing a light-transmitting substrate in which one surface is covered with a water- and oil-repellent film and the other surface is covered with a hydrophilic and anti-fog film.
  • the manufacturing method wherein the water- and oil-repellent coating has the hydrophilicity and anti-fogging property by treating perfluoroalkylalkylalkylsilane on the surface of a light-transmitting substrate and chemically bonding it by a low-molecular elimination reaction.
  • the coating is characterized by being formed of a layer containing titanium oxide having photocatalytic ability.
  • the building of the present invention comprises a window having a light-transmitting substrate, one surface of which is covered with a water-repellent and oil-repellent coating, and the other surface of which is covered with a hydrophilic and anti-fog coating.
  • the water- and oil-repellent coating is a perfluoroalkyl An alkylsiloxane, wherein the hydrophilic and anti-fog coating is a photocatalyst layer, the water- and oil-repellent coating surface is installed on the outdoor side, and the photocatalyst layer is installed on the indoor side. I do.
  • the vehicle of the present invention is a vehicle having a window made of a light-transmitting substrate, one surface of which is covered with a water / oil repellent coating, and the other surface of which is covered with a hydrophilic and anti-fog coating.
  • the water- and oil-repellent coating is perfluoroalkylalkylsiloxane
  • the hydrophilic and anti-fog coating is a photocatalyst layer
  • the water- and oil-repellent coating is on the outdoor side.
  • the optical catalyst layer is installed on the indoor side.
  • FIG. 1 is a conceptual cross-sectional view of a glass having a hydrophilic surface on one side and a water-repellent surface on the other side in Example 1 of the present invention.
  • FIG. 2 is a conceptual cross-sectional view of a glass having a hydrophilic surface on one side and a water-repellent surface on the other side in Example 2 of the present invention.
  • FIG. 3 is a conceptual cross-sectional view of a glass having a hydrophilic surface on one side and a water-repellent surface on the other side in Example 3 of the present invention.
  • FIG. 4 is a conceptual cross-sectional view of a glass having a hydrophilic surface on one side and a water-repellent surface on the other side in Example 4 of the present invention.
  • 1 is a glass substrate
  • 2 is a hydrophilic and anti-fog film
  • 3 is a water repellent film
  • 4 is a silica base layer.
  • the translucent substrate is preferably at least one selected from a glass plate and a plastic plate.
  • One surface of the light-transmitting substrate is preferably water- and oil-repellent, and the other surface is hydrophilic and anti-fog. This is because it may be required.
  • a polymeric or Bae Le Full O b alkyl alkyl silane which is a monomolecular film-like water repellent leather coatings, general formula CF 3 - (CF 2) n -R- S i X P C 13 _ p (n is 0 or an integer, R is an alkylene group, a vinylene group, an ethynylene group, or Si, a substituent containing an oxygen atom, is selected from H or an alkyl group, a cycloalkyl group, an aryl group, or a derivative thereof.
  • p is 0, 1 or 2), CF 3- (CF 2 ) n -R—S i X q (OA) 3 -q (n is 0 or an integer, R is an alkylene group, a vinylene group, Ethynylene group, or a substituent containing an Si or oxygen atom, X is a substituent selected from H or an alkyl group, a cycloalkyl group, an aryl group or a derivative thereof, and OA is an alkoxy group (where A is H or alkyl) Group), q is 0, 1 or 2), and / or CF 3 — (CF 2 ) n — R-S i X r Z 3 - r (n is 0 or an integer, R represents an alkylene group, vinylene group, Echiniren group or S i, a substituent containing an oxygen atom, X is H or aralkyl kill group, a cycloalkyl group,
  • the surface of the substrate is roughened to a submicron to micron-order unevenness by the silica underlayer, the water / oil repellency and hydrophilicity can be enhanced. Furthermore, if the silica base layer is treated by a dehydrochlorination reaction, a dealcohol reaction, or a dehydrocarbon reaction with perfluoroalkyl / alkyl / silane, the resulting coating has high peeling strength. In addition, if the silica underlayer is formed by applying a silica glass to the surface of a glass substrate and then performing a heat treatment or a plasma assing process, elution from the surface of the substrate is suppressed, and durability is improved. High glass plate.
  • silica primer layer S i C 1 4 surface of the glass substrate, S i HC 1 3, S i H 2 C l 2, CI - (S i C l 2 ⁇ ) n - S i C 1 3 ( n is an integer)
  • a film having high peeling resistance is obtained.
  • a hydrophilic photocatalyst layer a coating containing fine titanium particles is formed, and when organic substances attached to the surface are oxidized and decomposed in response to photoexcitation, the glass surface is always cleaned, and glass with excellent anti-fog effect is obtained. It becomes a board.
  • the coating containing titanium oxide fine particles has a sili- sion force, a glass plate with excellent scratch resistance is obtained.
  • the coating containing the titanium oxide fine particles contains an inorganic oxide other than silica and silicic acid, the hydrophilicity-imparting effect can be increased.
  • a phosphor obtained by adding a divalent metal aluminate such as calcium or strontium to a rare earth metal such as europium, prosodymium, or Z or neodymium or dysprosium has a catalytic effect. It is convenient for strengthening. Further, as a material for the glass substrate, it is better to use glass of a material that transmits at least 350 to 400 nm ultraviolet light, so that outdoor light can be used effectively and organic substances can be decomposed efficiently.
  • a step of forming a silica underlayer on one surface of a glass substrate, a step of treating with a perfluoroalkylalkylalkylsilane through the silica underlayer By forming a photocatalytic layer having a hydrophilic property, a glass plate having water- and oil-repellency on one side and anti-fogging on the other side can be produced.
  • a step of forming a silica underlayer on one side of the glass substrate, a step of forming a hydrophilic photocatalyst layer via the above-mentioned silica underlayer, and a step of treating the other side with perfluoroalkylalkylalkylsilane A method for producing a glass plate having a water- and oil-repellent property on one side and an antifogging property on the other side can be manufactured.
  • a hydrophilic photocatalytic layer By the forming step, a glass plate having one surface having water and oil repellency and the other surface having antifogging properties can be manufactured.
  • the step of treating one surface with perfluoroalkylalkylalkylsilane it is effective to perform a step of forming a water- and oil-repellent film by performing a dehydrochlorination reaction, a dealcohol reaction, or a de-HNCO reaction.
  • Water- and oil-repellent coatings can be manufactured.
  • a glass plate having higher performance of water repellency, oil repellency and anti-fog performance can be manufactured.
  • a method of applying and sintering a photocatalytic coating composition containing titanium oxide fine particles can be used to form a hydrophilic photocatalytic layer.
  • silica is included in the photocatalytic coating composition containing titanium oxide fine particles, a photocatalytic coating having high durability can be formed.
  • a photocatalytic coating composition containing titanium oxide fine particles was added to a silicic acid and an aluminate of a bivalent metal such as calcium or strontium, and a rare earth metal such as europium, prosodymium, and / or neodymium or dysprosium was added. Mixing the phosphor makes it possible to increase the catalytic activity.
  • the step of applying and sintering the photocatalytic coating composition containing the titanium oxide fine particles is performed simultaneously with the step of strengthening the air cooling of the glass substrate, the energy saving effect can be improved.
  • the step of forming the silica underlayer is performed simultaneously with the step of strengthening the air cooling of the glass substrate, the energy saving effect can be improved.
  • the glass of the present invention is used in a bathroom, a washroom, a dining room or a kitchen where the glass windows are easily fogged.
  • a building having more excellent water / oil repellency and Z or antifogging property can be provided.
  • the vehicle of the present invention when at least one or both surfaces of the film surface are processed to have an unevenness not more than the wavelength of visible light, water / oil repellency and / or antifogging properties are more excellent.
  • a vehicle with excellent safety can be provided.
  • At least a glass substrate is formed by a step of treating one surface of a glass substrate with perfluoroalkyl / alkyl / silane and a step of forming a hydrophilic photocatalytic layer on the other surface.
  • a glass plate could be manufactured in which one surface of the substrate surface was treated with perfluoroalkyl / alkyl / silane and the other surface was covered with a hydrophilic photocatalytic layer.
  • a step of forming a silica underlayer on one surface of a glass substrate a step of treating with a perfluoroalkylalkylsilane through the silica underlayer, Forming a hydrophilic photocatalytic layer on the other surface, at least one surface of the surface of the glass substrate is treated with a perfluoroalkylalkylalkylsilane via a silica underlayer, and the other surface Was able to produce a glass plate covered with a hydrophilic photocatalyst layer.
  • a third embodiment of the present invention includes a step of forming a silica base layer on one side of a glass substrate, Forming a hydrophilic and anti-fog photocatalyst layer, and treating the other surface with perfluoroalkyl, alkyl, and silane, so that at least one of the surfaces of the glass substrate is perfluorinated.
  • a glass sheet other surface is covered with a photocatalyst layer hydrophilic through a silica primer layer.
  • a hydrophilic and anti-fog photocatalytic layer for example, an anatase-type titanium oxide fine particle layer having high photocatalytic ability
  • the titanium oxide fine particles are formed by the presence of alkali components present in the glass due to moisture.
  • the particle layer was hydrolyzed, easily peeled off, and had a problem in durability.
  • the silica underlayer can block the alkali components present in the glass, so that the durability is significantly improved.
  • the conventional method has a durability of several months, but the present invention has a durability of several years to 10 years or more.
  • a step of forming a silica underlayer on both sides of a glass substrate a step of treating one side with perfluoroalkylalkylsilane through the silica underlayer, Forming a hydrophilic photocatalyst layer via the silica underlayer, whereby at least one surface of the surface of the glass substrate is treated with perfluoroalkylalkylalkylsilane via the silica underlayer.
  • a glass plate whose other surface was covered with a hydrophilic photocatalytic layer via a silica base layer could be manufactured.
  • a building was constructed in which the hydrophilic coating surface of the glass plate was installed on the room side and the water- and oil-repellent coating surface was installed on the outdoor side, and the visibility of the windows was confirmed. It was particularly effective in bathrooms, washrooms, diving or kitchens where the glass windows tend to be cloudy. At this time, if at least one or both of the film surfaces were processed to be uneven at or below the wavelength of visible light, a building with even better water and oil repellency and Z or antifogging properties could be provided. .
  • % means “% by weight”.
  • a three-fold molar amount of ammonia is added to an aqueous solution of titanium oxychloride or titanium oxysulfate in advance and mixed, and heated at 80 ° C for about 1 hour, and orthotitanic acid, titanium (IV) ion, peroxotitanic acid, and titanium oxide fine particles was prepared by mixing and dispersing.
  • the solid content of this paint after drying was adjusted so as to be about 10% in total weight.
  • an alkoxysilane such as tetraethoxysilane is added, it is converted into silica after film formation, and has an effect of maintaining the hydrophilic effect of the film.
  • the paint was applied to one surface of the well-washed air-cooled tempered float glass substrate 1 (the tin side is the inside of the car for window glass, and the indoor side is the building).
  • the film was uniformly applied to a film thickness of about 2 zm using a roll coater.
  • the coating film (hydrophilic and anti-fogging film) 2 containing titanium oxide fine particles having a thickness of about 0.1 m was formed by heating at 200 ° C. for about 30 minutes.
  • the heat treatment can be performed at 100 to 65 ° C., and plastic can be generally performed at a temperature equal to or lower than the softening point of the substrate. Can be higher.
  • the thickness is not more than 400 nm, the optical characteristics of the substrate are hardly deteriorated.
  • the thickness of the film containing the titanium oxide fine particles was practically optimal at about 1 nm to 3 nm.
  • a substance (perfluoroalkyl-alkyl'silane) containing a fluorocarbon group and a chlorosilane group is mixed on the surface opposite to the surface.
  • a non-aqueous solvent for example, CF 3 — (CF 2 ) 7 — (CH 2 ) 2 — SiC 1 at a concentration of 1% by weight in a solvent of hexanemethyldisiloxane,
  • the OH group is exposed on the surface of the glass, so the chlorosilyl group of the chlorosilane surfactant containing fluorine and the --OH group are dehydrochlorinated.
  • a perfluoroalkylalkylalkylsilane solution is applied in an atmosphere with a humidity of 35% or less and allowed to react with the glass surface for about 1 to 2 hours. Then, a nonaqueous organic solvent such as normal hexane is used. By washing and removing the unreacted perfluoroalkyl-alkyl-silane solution, a monomolecular film-like siloxane fluorocarbon film containing fluorine was formed on the surface of the glass substrate. The water repellency (118 degrees in contact angle) of this film was slightly higher than that of the polymer film.
  • alkoxysilane or isocyanatesilane is used as perfluoroalkylalkylalkylsilane
  • a dealcoholization reaction or a dehydrogenation reaction with HNCO water hydrolysis reaction with water occurs instead of a dehydrochlorination reaction
  • a similar siloxane-fluorocarbon-based polymer film could be prepared by the reaction of removing NH 2 and removing C ⁇ 2 ).
  • the glass surface becomes water-repellent as time elapses due to the adhesion of organic substances in the air.
  • the photocatalyst of the coating containing titanium oxide fine particles is formed on the indoor side. Due to the effect, the attached organic matter was oxidatively decomposed and the hydrophilic property was always maintained.
  • silica primer layer to form a surface unevenness of submicron to the previously roughened uneven micro N'oda water-repellent or hydrophilic effect was improved in c such submicron to micron order of the substrate
  • a method of mixing fine particles into silica glass at the time of forming a silicon underlayer was practically available.
  • the creation of the silica primer layer changes to Ri of the silicate one sharpened forming solution, S i C l 4, S i HC l 3, S i H 2 C l 2, CI - (S i C 1 2 ⁇ ) n - S i C 1 3 ( n is an integer) using at least one compound selected from, could also be used a method of contacting the glass substrate to cause a dehydrochlorination reaction to form silica under formation. In particular, this method was effective for forming a nanometer-level silica coating.
  • the coating containing the titanium oxide fine particles functions as a hydrophilic photocatalytic layer, and has an action of oxidatively decomposing organic substances attached to the surface in response to photoexcitation such as ultraviolet rays. This has the effect of preventing deterioration of the properties. Therefore, it is more effective to use glass made of a material that transmits ultraviolet light as the glass substrate. Even if glass that easily transmits ultraviolet light is used, there is no problem in using windows for automobiles or buildings, because the ultraviolet light that penetrates the glass can be almost completely cut by the coating containing titanium oxide fine particles inside. Practically, ultraviolet light with a wavelength of 350 nm to 400 nm Better results were obtained with more transparent white plate glass.
  • silica when silica is included together with the titanium oxide fine particles, there is an effect that the duration of hydrophilicity can be extended.
  • a coating containing titanium oxide fine particles a phosphor obtained by adding aluminate of calcium or strontium, which is a divalent metal other than silica and silica, to which europium, prosodymium, and Z or rare earth metals such as neodymium and dysprosium are added.
  • the use of a coating containing an inorganic oxide such as that described above could shift the wavelength at which the catalytic effect can be exhibited to longer wavelengths.
  • the step of applying the photocatalytic coating composition containing titanium oxide fine particles is performed before the step of strengthening the glass by air cooling. The effect was high.
  • the surface of the plastic substrate is previously treated with an ozone oxidation method, a corona treatment method, an oxygen plasma treatment method, etc. before being treated with perfluoroalkyl / alkyl / silane. If an active hydrogen group such as a hydroxyl group, an amino group, or an amide group is introduced, the same processing as for a glass substrate can be performed.
  • a solution for forming a silicide glass is sprayed on one side of the float glass substrate 1 to a thickness of about 2 zx m on each of the reinforced, non-reinforced, tin side and non-tin side.
  • the silicate glass forming solution may be, for example, a hard coating agent K P—
  • a glassy silica underlayer with a thickness of 800 nm (Although it is also referred to as a silica coating, titanium may be included.) 4 was formed.
  • plasma assing about 300 W, about 20 minutes
  • This method is effective for plastics because it is not necessary to heat the substrate to a high temperature.
  • a titanium oxide film (hydrophilic and anti-fogging film) 2 was formed on the opposite side of the surface on which the silica film was formed.
  • a glass sample B having a water-repellent film 3 formed on the surface was prepared (Fig. 2).
  • a silica coating 4 was formed on one side (a reinforced, non-reinforced, tin side and a non-tin side were created) in the same manner as in Example 2, and then the same as in Example 1 was performed.
  • a titanium oxide film (hydrophilic and anti-fog film) 2 was formed on the surface on which the silica layer was formed, and a water-repellent film 3 was formed on the surface on which the silica film was not formed by using the method.
  • Glass sample C was prepared (Fig. 3).
  • Nozzle diameter about 1 mm
  • C had a higher initial hydrophilicity effect than A. Contact angles could not be measured. In addition, when evaluated at the time when the contact angle becomes 20 degrees, the durability of the hydrophilicity was about 10 times better.
  • the titanium oxide film formed by adding about 30% of silica when forming the titanium oxide film was able to improve the hydrophilicity duration after light irradiation by about 10 times.
  • a silicate glass forming solution for example, Shin-Etsu Chemical Co., Ltd. hard coating agent KP-110 OA or 110 B) or Tokyo Ohka Kogyo Co., Ltd. These coating agents could be diluted with ethanol.)) And diluted with ethanol to about 1Z5, and cast to a thickness of about 0.5 zxm on both sides of the float glass substrate by casting. After heating, the substrate was heated at a temperature of 350 ° C for 30 minutes to form a glassy silicon-based underlayer (may contain titanium oxide) 4 with a thickness of about 50 nm on both sides. .
  • a titanium oxide film (hydrophilic film) 2 was formed on one surface of the piece on which the silica film was formed, and further on the opposite side.
  • a glass plate having a water-repellent film 3 formed on the surface of the silica coating was manufactured (FIG. 4).
  • the glass manufactured in this way is installed on the window of a building so that the water-repellent surface is outdoors and the hydrophilic surface is indoors, and the glass is exposed to sunlight from outside and the humidity is changed in the room.
  • the glass surface on the indoor side was not fogged even one week after sunlight was irradiated for one day in winter.
  • the glass surface becomes water-repellent as the organic matter in the air adheres to it over time, but in this case, the inside of the car is covered with a coating containing ultraviolet light and titanium oxide fine particles that pass through the glass. Due to the photocatalytic effect, the attached organic matter was oxidized and decomposed, and the hydrophilicity was always maintained.
  • the glass surface becomes water-repellent with the passage of time due to the attachment of organic matter in the air, but in this case, the inside of the car contains ultraviolet light and titanium oxide fine particles that pass through the glass. Due to the photocatalytic effect of the coating containing The organic matter was oxidatively decomposed and kept hydrophilic at all times.
  • silica primer layer to form a surface unevenness of submicron to the previously roughened uneven micro N'oda water-repellent or hydrophilic effect was improved in c such submicron to micron order of the substrate
  • a method of mixing fine particles into silicate glass at the time of forming a silicon underlayer was practically available.
  • silica primer layer the Ri river of the silicon gate glass forming solution, S i C l 4, S i HC l 3, S i H 2 C l 2, CI one (S i C 1 2 O)
  • n-SiC13 n is an integer
  • this method was effective for forming a nanometer-level silica coating.
  • an automobile or a building having windows with the hydrophilic coating surface of the glass plate on the inside and the water- and oil-repellent coating surface on the outside is manufactured. This greatly improves outdoor visibility in rainy weather and is durable. As a result, it is possible to provide vehicles and comfortable buildings with excellent safety.
PCT/JP2001/009193 2000-10-23 2001-10-19 Light-transmitting substrate, process for producing the same, and building and vehicle WO2002034687A1 (en)

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Cited By (2)

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WO2006107082A2 (en) * 2005-04-01 2006-10-12 Daikin Industries, Ltd. Surface modifier and its use
CN107083184A (zh) * 2016-02-12 2017-08-22 通用汽车环球科技运作有限责任公司 形成自清洁膜系统的方法

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