WO2018067960A1 - Revêtement renforcé par des nanoparticules pour films transparents résistant aux uv et procédés et composants associés - Google Patents

Revêtement renforcé par des nanoparticules pour films transparents résistant aux uv et procédés et composants associés Download PDF

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Publication number
WO2018067960A1
WO2018067960A1 PCT/US2017/055579 US2017055579W WO2018067960A1 WO 2018067960 A1 WO2018067960 A1 WO 2018067960A1 US 2017055579 W US2017055579 W US 2017055579W WO 2018067960 A1 WO2018067960 A1 WO 2018067960A1
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group
methyl
ethyl
solution
cerium
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PCT/US2017/055579
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English (en)
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Michael R. Dahlby
Cesar Ernesto Arevalo
Glenn Allen MESA, Jr.
William D. Bickmore
Martin BEN-DAYAN
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Metashield Llc
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Publication of WO2018067960A1 publication Critical patent/WO2018067960A1/fr

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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
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/08—Homopolymers or copolymers of acrylic acid esters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments

Definitions

  • UV-resistant coatings are used to protect materials that are sensitive to the ultraviolet portion of the electromagnetic spectrum (e.g. that decay over extended periods of exposure to UV light).
  • materials that are sensitive to the ultraviolet portion of the electromagnetic spectrum (e.g. that decay over extended periods of exposure to UV light).
  • a few examples include wood, plastics, and materials containing dyes.
  • Films enhanced with UV-absorbing nanoparticles such as cerium oxide, titanium dioxide, and zinc oxide make excellent coatings for these applications due to their selectively high absorption coefficient in the UV spectral range and low absorption coefficient in the visible range.
  • the use of nanoparticles allows for a high concentration of UV absorbers in a very thin coating.
  • nanoparticle synthesis often requires delicate synthetic conditions as well as a number of specialty chemicals to control particle size, size distribution, and stability. Nanoparticle synthesis also frequently requires the use of high temperatures, complicated apparatuses, and/or significant reaction times. Furthermore, if the nanoparticles are purchased from an outside vendor, shipping conditions must be carefully controlled to protect the nanoparticles (e.g. from high temperatures that can cause agglomeration and decomposition of the nanoparticles) during transit. All of these aspects reduce the cost effectiveness of such technology.
  • Another challenge is overcoming particle agglomeration when mixing pre- made nanoparticles into the coating solution.
  • nanoparticles are typically a function of their size. Certain other properties may manifest when particular, consistent spacing between the nanoparticles is achieved. Agglomeration of the particles effectively negates these effects due to the change in effective size and spacing and renders the particles ineffective. In addition, high levels of agglomeration often result in loss of transparency of the coatings which may render the coating ineffective if transparency is a required attribute. This is an especially difficult task if the pre-made nanoparticles are procured in powder form.
  • various embodiments are provided relating to silica-based coatings, including the preparation of solution-based UV- resistant coatings that maintain high transparency for visible wavelengths and concurrently synthesizes the UV-absorbing nanoparticles in-situ.
  • a method of forming a coating on a substrate comprises: stirring a first solution comprising a UV resistant material comprising a UV-absorbing nanoparticle prepared by a process of reacting a cerium salt with water, alcohol and a strong base; adding an acid capable of lowering the pH to a range of about pH 2-5 to the first solution to provide a second solution; adding to the second solution the following compounds to provide a third solution:
  • Ri, R2, R3, are each independently selected from the group consisting of methyl, ethyl and propyl, and Rt is selected from the group consisting of methyl, ethyl and propyl, vinyl, 3-glycidyloxypropyl, 3-aminopropyl;
  • Ri, R2, R3, and R4 are each independently selected from the group consisting of methyl, ethyl and propyl; and applying the third solution to a substrate.
  • the compounds added to the second solution are: OR- ⁇
  • Ri, R2, R,3 and R4 are ethyl.
  • the acid is selected from the group consisting of acetic acid, oxalic acid, citric acid, and formic acid.
  • the acid is acetic acid.
  • the cerium salt is selected from the group consisting of one or more of cerium chloride, cerium bromide, cerium fluoride, cerium iodide, cerium nitrate.
  • the cerium salt is cerium chloride.
  • the strong base is selected from the group consisting of one or more of ammonium hydroxide, sodium hydroxide, lithium hydroxide, potassium hydroxide, rubidium hydroxide, cesium hydroxide, calcium hydroxide, strontium hydroxide, barium hydroxide.
  • the strong base is selected from the group consisting of one or more of ammonium hydroxide, sodium hydroxide.
  • applying the sol-gel to a surface of a structure includes applying the third solution to glass, wood, polymer, metal, ceramic or a semiconducting material.
  • applying the sol-gel to a surface of a structure includes dip-coating, spin-coating, spray-coating or forming a film of the sol-gel and applying the film to the surface of the structure.
  • a pH of the first solution is approximately
  • a pH of the second solution is approximately 4.
  • a method of forming a coating on a substrate comprises: stirring a first solution comprising a UV resistant material comprising a UV-absorbing nanoparticle prepared by a process of reacting a cerium salt with water, alcohol and a strong base; adding an acid capable of lowering the pH to a range of about pH 2-5 to the first solution to provide a second solution; adding to the second solution the following compounds to provide a third solution:
  • Ri, R2, R3, are each independently selected from the group consisting of methyl, ethyl and propyl, and Rt is selected from the group consisting of methyl, ethyl and propyl;
  • Ri, R2, R and R4 are each independently selected from the group consisting of methyl, ethyl and propyl;
  • Ri, R2, and R3 are each independently selected from the group consisting of methyl and ethyl; and applying the third solution to a substrate.
  • the acid is acetic acid.
  • the compounds added to the second solution are TEOS. MTEOS and GPTMS.
  • the cerium salt is selected from the group consisting of one or more of cerium chloride, cerium bromide, cerium fluoride, cerium iodide, cerium nitrate.
  • the cerium salt is cerium chloride.
  • the strong base is selected from the group consisting of one or more of ammonium hydroxide, sodium hydroxide, lithium hydroxide, potassium hydroxide, rubidium hydroxide, cesium hydroxide, calcium hydroxide, strontium hydroxide, barium hydroxide.
  • the strong base is selected from the group consisting of one or more of ammonium hydroxide, sodium hydroxide.
  • composition which is prepared by a process comprising the steps of combining the following compounds:
  • Ri, R2, R3, are each independently selected from the group consisting of methyl, ethyl and propyl, and Rt is selected from the group consisting of methyl, ethyl and propyl;
  • Ri, R2, R,3 and R4 are each independently selected from the group consisting of methyl, ethyl and propyl;
  • Ri, R2, and R3 are each independently selected from the group consisting of methyl and ethyl; and a plurality of UV-absorbing nanoparticles, under conditions sufficient to produce a polysiloxane matrix.
  • the plurality of UV-absorbing nanoparticles includes a plurality of cerium oxide nanoparticles.
  • a structure comprising: a substrate; a coating on a first surface of the substrate, the coating comprising a hybrid nanosilica (HNS) material prepared by the process of combining the following compounds: [0041] wherein Ri, R2, R3, are each independently selected from the group consisting of methyl, ethyl and propyl, and Rt is selected from the group consisting of methyl, ethyl and propyl;
  • HNS hybrid nanosilica
  • Ri, R2, R3 and R4 are each independently selected from the group consisting of methyl, ethyl and propyl;
  • Ri, R2, and R3 are each independently selected from the group consisting of methyl and ethyl; and a plurality of UV-absorbing nanoparticles, under conditions sufficient to produce a polysiloxane matrix.
  • the plurality of UV-absorbing nanoparticles includes a plurality of cerium oxide nanoparticles.
  • the substrate comprises a glass material.
  • the substrate comprises a material including at least one of the group consisting of: wood, metal, polymer, ceramic and semiconducting material.
  • a coating composition which comprises: a hybrid nanosilica (HNS) material prepared by the process the following compounds:
  • Ri, R2, R3, are each independently selected from the group consisting of methyl, ethyl and propyl, and R4 is selected from the group consisting of methyl, ethyl and propyl;
  • Ri, R2, R3 and R4 are each independently selected from the group consisting of methyl, ethyl and propyl; and R 2 0-Si'
  • Ri, R2, and R3 are each independently selected from the group consisting of methyl and ethyl.
  • FIG. 1 is a flow chart depicting a method according to an embodiment of the present disclosure
  • FIG. 2 is a graph showing the transmission of various wavelengths of light through a coating formed in accordance with an embodiment of the present disclosure.
  • FIG. 3 is an image from a dark-field microscope showing nanoparticles embedded in a matrix material according to an embodiment of the present disclosure.
  • Embodiments of the present disclosure provide a UV -resistant coating or film for use on various articles and, in various embodiments, may overcome some or all of the challenges described above by synthesizing nanoparticles, in such a way that enables the nanoparticle synthesis solution to be directly incorporated into a coating solution.
  • the coating solution may include those described in U.S. Provisional Patent Application No. 62/249,628 (attorney docket no. 78501.0015) filed on Nov. 2, 2015, U.S. Provisional Patent Application No. 62/265,156 (attorney docket number 78501.0026) filed on Dec. 9, 2015 and U.S. Provisional Patent Application No. 62/327,160 (attorney docket no. 78501.0027) filed on April 25, 2016, U.S. Provisional Patent Application No. 62/405,123 (attorney docket no. 78501.0030) filed on Oct. 6, 2016, and/or U.S. Patent Application Publication No.
  • a coating solution may include nanosilica composition or material, sometimes referred to as a hybrid nanosilica (HNS) material.
  • HNS material may be used to form coatings that are unlike conventional petroleum based polymers, varnishes, lacquers or paints in that the HNS coatings are composed of chains of organically substituted silica chemically linked together to form an extensive organic-inorganic based material.
  • the resultant solution is a highly transparent liquid that, under proper conditions, undergoes a sol- gel morphological transformation causing it to harden into a solid glass-like film.
  • compositions described herein may be used as a coating or may be used to form a cast, molded, or other stand-alone structure.
  • Various novel characteristics, including impact resistance, are further described in patent applications previously incorporated by reference.
  • HNS materials a base hybrid organic- inorganic silica-based material
  • a material made from sol-gel hydrolysis and condensation reactions Precursors to form such films may be chosen from the
  • additional cross-linking organic molecules may include, for example, 1,8-diaminooctane (ODA) or 1,4-diaminobutane (BDA).
  • ODA 1,8-diaminooctane
  • BDA 1,4-diaminobutane
  • the base HNS coatings may exhibit thicknesses ranging from less than 100 nm up to hundreds of microns, are optically transparent and can be relatively hard when cross-linkers are included.
  • the wettability (hydrophilicity, hydrophobicity, oleophobicity, omniphobicity, etc.) is easily tailored by modifying the organically substituted trialkoxysilanes to produce coatings that exhibit self-cleaning and antifogging properties.
  • HNS coatings can adopt other optical and physical properties when doped with nanoparticles including but not limited to ultraviolet (UV) attenuation, antireflection, formation of plasmons, and biological deterrence.
  • UV ultraviolet
  • the coatings described herein may be used for various applications. Some non-limiting examples include increasing the break strength of glass and other substrates, making substrates more scratch resistant, increasing efficiency of photovoltaic devices, and extending the lifetime of substrates by preventing ultra-violet degradation and chemical corrosion.
  • the HNS composition may include or otherwise serve as a matrix for other nanoparticles such as, for example, UV -resistant nanoparticles.
  • the silica nanoparticles used to form the matrix may be formed using a sol-gel method (e.g., acid or base catalyzed) using tetraethylorthosilicate (TEOS), methyltrimethoxysilane (MTEOS), and (3-glycidyloxypropyl)trimethoxysilane (GPTMS).
  • TEOS tetraethylorthosilicate
  • MTEOS methyltrimethoxysilane
  • GPSTMS 3-glycidyloxypropyl
  • the TEOS, MTEOS, and GPTMS may go through a hydrolysis and then a condensation reaction to form a silica based matrix with methyl and epoxide functional groups (see, e.g., Chemical Expression 1 below).
  • epoxide functional groups may be used in conjunction with diamine or amine that may include, for example, 1,4-butyldiamine (BDA) to link together.
  • BDA 1,4-butyldiamine
  • BDA 1,4-butyldiamine
  • the HNS compound is a complex mixture of organically-substituted silica chains (i.e. acid catalyzed) chemically linked together to form an extensive organic-inorganic matrix.
  • organically-substituted silica nanoparticles i.e. base catalyzed
  • an amine cross linker e.g. a diamine or an alkoxy silane featuring an amine group that reacts with the epoxide functional group on GPTMS
  • the HNS compound is a combination of silica ingredients which are liquid prior to and during application of the compound to a given surface (e.g. a glass substrate), becoming solid after coating a structure and being exposed to relatively low temperatures (e.g. temperatures associated with ordinary sunlight). This is also known as a sol-gel change of state.
  • the sol-gel process begins with monomer hydrolysis followed by condensation between two or more monomers to form oligomers consisting of several silicon and oxygen atoms. As condensation continues, the resulting morphology is determined by the pH of the solution. Under acidic conditions (i.e. pH less than 7), condensation proceeds via oligomers linking together to form long chains, whereas under basic conditions (i.e. pH greater than 7) condensation proceeds in a fashion where the oligomers grow independently to form discrete particles. Both acidic and basic preparations are amenable to film formation. However, films prepared from basic solutions with discrete particles tend to yield rough, brittle films. This challenge can be overcome with the use of a crosslinker to improve inter- particle bonding.
  • the resulting coating is very hard, durable, and highly resistant to sunlight degradation.
  • the coating exhibits a hardness of at least approximately 5.0 on the Mohs hardness scale.
  • the coating may exhibit a hardness of approximately 5.5 to approximately 6.5 on the Mohs hardness scale, or even greater.
  • the coating may exhibit a hardness that is similar to that of steel.
  • the coating provides substantial abrasion resistance, as shown through sand blasting and other simulated environments.
  • HNS coatings and films are capable of providing a highly transparent surface through which light may be efficiently transmitted despite exposure to various environmental conditions.
  • HNS coatings or films are highly transparent across a wide sector of the solar spectrum, ranging from near-infrared to ultraviolet, and including the UV-a and UV-b spectra.
  • hydrophobic, hydrophilic or oleophobic chemistry may further be added to the HNS compound.
  • methyl triethoxysilane, (3- glycidyloxypropyl) trimethoxysilane, hexamethyldisilazane or other organic silanes may be added for purposes of providing a material that exhibits hydrophobic characteristics.
  • poly(ethylene glycol) silane or other similar chemicals may be added for purposes of providing a composition with hydrophilic characteristics.
  • hydrophobic, hydrophilic and/or oleophobic additives have been shown to decrease the buildup of precipitation deposited minerals and reduce the tendency of water to form a bead on a given surface (e.g., from precipitation or dew).
  • Hydrophobic coatings reduce the volume of water on a given surface.
  • an oleophobic coating reduces the volume of oil on a given surface.
  • the hydrophilic coatings help spread out water with a low contact angle between the surface and the water. In all cases (hydrophilic, hydrophobic, and oleophobic) the residual mineralization or negative byproducts will be minimized compared to structures and devices without a similar coating.
  • the above chemistry may be altered by adding hydrophobic elements such as methyltriethoxysilane, vinyltriethoxysilane,
  • octyltriethoxysilane phenyltriethoxysilane or any other silane precursor with hydrophobic characteristics.
  • the above chemistry is additionally modified (or alternatively modified) by replacing tetraethyl orthosilicate with tetramethyl orthosilicate.
  • a coating composition may comprise a hybrid organic-inorganic material made from the hydrolysis and condensation of a metal alkoxide and organically substituted metal alkoxides in the presence of water and optionally a catalyst. The resulting material is linked together through bridging oxygen atoms.
  • a coating composition may include a hybrid organic-inorganic silica-based material made from the hydrolysis and condensation of a tetraalkoxysilane and an organically substituted trialkoxy silane in the presence of water and a catalyst resulting in a material comprising S1O4 tetrahedra, Si03(aikyl) tetrahedra, and SiCbiepoxide) tetrahedra linked together through bridging oxygen atoms.
  • a coating composition comprises a hybrid organic-inorganic silica-based material made from the hydrolysis and condensation of one or more of the following: a tetraalkoxysilane, alkyl trialkoxysilane, and epoxide functionalized siloxanes in the presence of water and a catalyst resulting in a material comprising S1O4 tetrahedra, Si03(alkyl) tetrahedra, and Si03(epoxide) tetrahedra linked together through bridging oxygen atoms.
  • a coating composition comprises a hybrid nanosilica (HNS) material made from the hydrolysis and condensation of tetraethylorthosilicate (TEOS), methyl triethoxysilane (MTEOS), and (3- glycidoxypropyl)trimethoxysilane (GPTMS) in the presence of water and a catalyst resulting in a material comprising S1O4 tetrahedra, Si03(CH4) tetrahedra, and Si03(CH2CH2CH20 CH2CH CH2O) tetrahedra linked together through bridging oxygen atoms.
  • HNS hybrid nanosilica
  • a coating composition comprises a hybrid nanosilica material made from tetraethylorthosilicate (TEOS), methyl triethoxysilane (MTEOS) and glycidox propyltrimethoxysilane (GPTMS).
  • TEOS tetraethylorthosilicate
  • MTEOS methyl triethoxysilane
  • GTMS glycidox propyltrimethoxysilane
  • Ri, R2, R3, are each independently selected from the group consisting of methyl, ethyl and propyl, and R4 is selected from the group consisting of methyl, ethyl and propyl;
  • Ri, R2, R3 and R4 are each independently selected from the group consisting of methyl, ethyl and propyl;
  • Ri, R2, and R3 are each independently selected from the group consisting of methyl and ethyl.
  • Embodiments of the present disclosure may combine a process used to synthesize the nanoparticles and the method of producing a solution used for a coating material into a single, unified process.
  • a strong base is provided for the synthesis of UV-absorbing nanoparticles as indicated at block 102.
  • the base may include the solvent system that is required for the coating solution.
  • a cerium salt may be added to the base to grow the nanoparticles in situ.
  • the nanoparticles may be grown for a specified amount of time as indicated at block 106. For example, in some embodiments, such UV-absorbing nanoparticles may be formed in little as one minute to three minutes.
  • UV absorbing films may be produced that maintain high transparency in the visible range of wavelengths.
  • cerium oxide nanoparticles may be prepared using a precursor salt such as cerium (III) chloride heptahydrate or cerium (III) nitrate hexahydrate.
  • Other metal oxides such as zinc oxide and titanium dioxide that absorb light in the UV range may also be prepared in a similar fashion.
  • the precursor salt is added to a solution comprising water, a homogenizing solvent such as an alcohol (ethyl, propyl, butyl, etc.), and a strong base such as ammonium hydroxide or sodium hydroxide.
  • a homogenizing solvent such as an alcohol (ethyl, propyl, butyl, etc.)
  • a strong base such as ammonium hydroxide or sodium hydroxide.
  • the pH of the solution may be approximately 9 or higher.
  • a weak acid such as acetic acid may be added after a time period ranging, for example, from 1-3 minutes to quench particle growth and, at the same time, to produce an acidic environment amenable to sol-gel film formation upon its application to a substrate or other structure.
  • alkoxysilane and organoalkoxysilane such as tetraethyl orthosilicate (TEOS), methyl triethoxy silane, and any other compound that undergoes the typical sol-gel reactions
  • TEOS tetraethyl orthosilicate
  • the solution may be used to coat a substrate (e.g. by way of drop-, dip-, or spray-coating), or it may be cast into a mold to form monolithic structures for subsequent application to a structure, or it may be applied in any other fashion that allows for the sol-gel reactions to form a solid material.
  • a step may be included in the process to appropriately adjust the pH (e.g., raise) to a level amenable for the siloxane chemistry to occur.
  • a coating composition may formed by stirring a first solution comprising a UV-absorbing nanoparticle prepared by a process of reacting a cerium salt with water, alcohol and a strong base. Acid, capable of lowering the pH to a range of about pH 2-5, is added to the first solution to provide a second solution. The following compounds are then added to the second solution to provide a third solution:
  • Ri, R2, R,3, are each independently selected from the group consisting of methyl, ethyl and propyl
  • R4 is selected from the group consisting of methyl, ethyl and propyl, vinyl, 3 -glycidyloxy propyl, 3-aminopropyl
  • Ri, R2, R,3, and R4 are each independently selected from the group consisting of methyl, ethyl and propyl.
  • the compounds added to the second solution are:
  • Ri, R 2 , R,3 and R4 are ethyl.
  • the acid used to lower the pH may include acetic acid, oxalic acid, citric acid, and formic acid.
  • the cerium salt may include one or more of cerium chloride, cerium bromide, cerium fluoride, cerium iodide, cerium nitrate.
  • a coating composition may be formed by stirring a first solution comprising a UV-absorbing nanoparticle prepared by a process of reacting a cerium salt with water, alcohol and a strong base. Acid, capable of lowering the pH to a range of about pH 2-5, is added to the first solution to provide a second solution. The following compounds are then added to the second solution to provide a third solution:
  • Ri, R2, R,3, are each independently selected from the group consisting of methyl, ethyl and propyl, and Rt is selected from the group consisting of methyl, ethyl and propyl;
  • Ri, R2, R,3 and R4 are each independently selected from the group consisting of methyl, ethyl and propyl;
  • Ri, R2, and R3 are each independently selected from the group consisting of methyl and ethyl.
  • the acid is acetic acid.
  • the compounds added to the second solution are TEOS. MTEOS and GPTMS.
  • the cerium salt may include one or more of cerium chloride, cerium bromide, cerium fluoride, cerium iodide, cerium nitrate.
  • the strong base may include one or more of ammonium hydroxide, sodium hydroxide, lithium hydroxide, potassium hydroxide, rubidium hydroxide, cesium hydroxide, calcium hydroxide, strontium hydroxide, barium hydroxide.
  • composition is prepared by a process comprising the steps of combining the following compounds:
  • Ri, R2, R3, are each independently selected from the group consisting of methyl, ethyl and propyl, and R4 is selected from the group consisting of methyl, ethyl and propyl;
  • Ri, R2, R,3 and R4 are each independently selected from the group consisting of methyl, ethyl and propyl;
  • Ri, R2, and R3 are each independently selected from the group consisting of methyl and ethyl; and a plurality of UV-absorbing nanoparticles, under conditions sufficient to produce a polysiloxane matrix.
  • the plurality of UV-absorbing nanoparticles includes a plurality of cerium oxide nanoparticles.
  • the various coating compositions described herein may be used on any of a variety of surfaces including, for example, wood, metal, polymer, ceramic and semiconducting material.
  • Various techniques of applying the sol-gel to a surface of a structure include dip- coating, spin-coating, spray-coating or forming a film of the sol-gel and applying the film to the surface of the structure.
  • Various other materials on which the coatings may be applied, techniques for applying such coatings, and various example applications or utilizations of such coatings, may be found in the previously incorporated priority documents.
  • Cerium chloride heptahydrate having a mass of 0.042 grams was added to a solution of 12.5 milliliters of water, 26.2 milliliters of ethanol, and 100 microliters of ammonium hydroxide. The pH of the solution was 9.
  • FIG. 2 shows a graph with transmission testing data for the coatings, indicating blocking or absorption of light in UV ranges but effective transmission of light at visible wavelengths.
  • FIG. 3 is a photo-micrograph of the coating material of showing the spacing of nanoparticles embedded in a matrix material.

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Abstract

La présente invention concerne diverses compositions de revêtement, notamment des compositions à base de silice, des procédés de préparation et d'utilisation de telles compositions, et des applications de telles compositions. Dans un mode de réalisation, il est décrit un procédé d'incorporation de nanoparticules de protection contre les UV dans une matrice de sol gel, ainsi que des compositions résultantes et des utilisations. Selon un mode de réalisation, la synthèse des nanoparticules et la préparation d'une solution de revêtement peuvent être effectuées dans un unique récipient, ce qui permet d'éliminer le besoin d'étapes de traitement supplémentaires. Des applications de ce procédé comprennent, entre autres, des revêtements protecteurs pour les matériaux sensibles aux UV, tels que le bois, les plastiques et les colorants.
PCT/US2017/055579 2016-10-06 2017-10-06 Revêtement renforcé par des nanoparticules pour films transparents résistant aux uv et procédés et composants associés WO2018067960A1 (fr)

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