GB2134413A - Coating process - Google Patents
Coating process Download PDFInfo
- Publication number
- GB2134413A GB2134413A GB08400420A GB8400420A GB2134413A GB 2134413 A GB2134413 A GB 2134413A GB 08400420 A GB08400420 A GB 08400420A GB 8400420 A GB8400420 A GB 8400420A GB 2134413 A GB2134413 A GB 2134413A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coating
- sol
- coating composition
- substrate
- dried
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 40
- 239000011248 coating agent Substances 0.000 claims abstract description 34
- 239000008199 coating composition Substances 0.000 claims abstract description 20
- 239000006185 dispersion Substances 0.000 claims abstract description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 150000002148 esters Chemical class 0.000 claims abstract description 10
- 238000001246 colloidal dispersion Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 18
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 18
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 150000001450 anions Chemical class 0.000 claims description 4
- 238000007598 dipping method Methods 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 230000002950 deficient Effects 0.000 claims description 3
- 238000010422 painting Methods 0.000 claims description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000003892 spreading Methods 0.000 claims description 2
- 229920002125 Sokalan® Polymers 0.000 claims 1
- 229960001422 aluminium chlorohydrate Drugs 0.000 claims 1
- LVYZJEPLMYTTGH-UHFFFAOYSA-H dialuminum chloride pentahydroxide dihydrate Chemical compound [Cl-].[Al+3].[OH-].[OH-].[Al+3].[OH-].[OH-].[OH-].O.O LVYZJEPLMYTTGH-UHFFFAOYSA-H 0.000 claims 1
- 229920001485 poly(butyl acrylate) polymer Polymers 0.000 claims 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims 1
- 239000004584 polyacrylic acid Substances 0.000 claims 1
- 239000004926 polymethyl methacrylate Substances 0.000 claims 1
- NQLVQOSNDJXLKG-UHFFFAOYSA-N prosulfocarb Chemical compound CCCN(CCC)C(=O)SCC1=CC=CC=C1 NQLVQOSNDJXLKG-UHFFFAOYSA-N 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 11
- 230000001464 adherent effect Effects 0.000 abstract description 6
- 239000000377 silicon dioxide Substances 0.000 abstract description 5
- SYRHIZPPCHMRIT-UHFFFAOYSA-N tin(4+) Chemical compound [Sn+4] SYRHIZPPCHMRIT-UHFFFAOYSA-N 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 239000004816 latex Substances 0.000 description 6
- 229920000126 latex Polymers 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011368 organic material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- -1 aluminium alkoxides Chemical class 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 description 2
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- 229910001651 emery Inorganic materials 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- IJGSGCGKAAXRSC-UHFFFAOYSA-M tris(2-hydroxyethyl)-methylazanium;hydroxide Chemical compound [OH-].OCC[N+](C)(CCO)CCO IJGSGCGKAAXRSC-UHFFFAOYSA-M 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910021627 Tin(IV) chloride Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001935 peptisation Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920001290 polyvinyl ester Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- ALHBQZRUBQFZQV-UHFFFAOYSA-N tin;tetrahydrate Chemical compound O.O.O.O.[Sn] ALHBQZRUBQFZQV-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/16—Use of materials for tobacco smoke filters of inorganic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/14—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of germanium, tin or lead
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0219—Coating the coating containing organic compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/50—Carbon dioxide
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL 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
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/22—Surface treatment of glass, not in the form of fibres or filaments, by coating with other inorganic material
- C03C17/23—Oxides
- C03C17/27—Oxides by oxidation of a coating previously applied
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
- C04B41/87—Ceramics
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/03—Constructional details of gas laser discharge tubes
- H01S3/036—Means for obtaining or maintaining the desired gas pressure within the tube, e.g. by gettering, replenishing; Means for circulating the gas, e.g. for equalising the pressure within the tube
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL 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
- C03C2217/00—Coatings on glass
- C03C2217/20—Materials for coating a single layer on glass
- C03C2217/21—Oxides
- C03C2217/211—SnO2
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL 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
- C03C2217/00—Coatings on glass
- C03C2217/20—Materials for coating a single layer on glass
- C03C2217/21—Oxides
- C03C2217/212—TiO2
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL 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
- C03C2217/00—Coatings on glass
- C03C2217/20—Materials for coating a single layer on glass
- C03C2217/21—Oxides
- C03C2217/213—SiO2
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL 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
- C03C2218/00—Methods for coating glass
- C03C2218/10—Deposition methods
- C03C2218/11—Deposition methods from solutions or suspensions
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL 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
- C03C2218/00—Methods for coating glass
- C03C2218/30—Aspects of methods for coating glass not covered above
- C03C2218/32—After-treatment
- C03C2218/322—Oxidation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Electromagnetism (AREA)
- Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
A coating composition which is formed from a colloidal dispersion (e.g. a sol of silica, tin (IV) or titania) and an organic coating aid which is an aqueous dispersion of a polyacrylic ester (as defined in the Specification) is applied to a substrate to form a layer which subsequently may be dried and heated to give an inorganic coating. The organic coating aid assists in forming an adherent dried coating which subsequently may be converted to an adherent inorganic coating by heating.
Description
SPECIFICATION
Improvements in or relating to materials
The present invention relates to material and more particularly to materials in the form of inorganic coatings and the preparation of such coatings.
According to one aspect of the present invention there is provided a process for the preparation of an inorganic coating which comprises applying a coating composition to a substrate to form a layer thereon, said coating composition having been formed from a colloidai dispersion and an organic coating aid comprising an aqueous dispersion of a polyacrylic ester (as hereinafter defined), drying the layer to form a dried coating and heating the dried coating to give an inorganic coating.
It has been found that the dried coating obtained using an organic coating in accordance with the present invention is significantly more adherent than dried coatings obtained using a colloidal dispersion alone.
Also it has been found that organic material comprising or derived from the organic coating aid may be removed from the dried coating produced in accordance with the present invention by heating to give an inorganic coating having good adherence to the substrate.
It will be appreciated that the heating effects decomposition of organic material and, when carried out in an oxidising atmosphere, removal of carbonaceous residues.
As used in this Specification "polyacryiic ester" embraces polyacrylic esters as such and related homo-and co-polymers which contain or include a polyacrylic ester. An example of an organic coating aid in accordance with the present invention is an aqueous emulsion of a polyvinyl ester (e.g. polyvinyl acetate).
It is to be understood that, in accordance with the present invention, the organic coating aid may comprise a dispersion in water of an organic substance, which is substantially insoluble in water. The dispersion may be e.g. in the form of an emulsion.
Such a dispersion has been termed "a latex" in the literature. Examples of other monomers which may be polymerised or copolymerised to form polymers suspended in water to give a latex are methyl methacrylate, butylacrylate, acrylic acid and styrene (to form an acrylic ester-styrene co-polymer). A coating composition in accordance with the present invention may also contain surfactants to stabilise particles of polymer during preparation and plasticisers (e.g. dibutyl phthalate) to promote flexibility in the film formed when water is removed from the coating composition.
A "latex" can be chosen, for example, from a wide range of commercially available dispersions (e.g.
Primal HA-8 R (an acrylic emulsion (45.5% solids content) and Primal HA-388 R (a non-ionic acrylic latex believed to contain methyl methacrylate, butyl acrylate and acrylic acid) marketed by Rohm and
Haas (UK) Ltd. of Croydon England).
Examples of colloidal dispersions which can be used in forming the coating composition are coiloidal solutions (e.g. sois) such as sols of silica, tin (IV) oxide, titania and alumina.
By way of example silica sols which may be used in accordance with the present invention include those commercially available as iow viscosity liquids containing up to 50% by weight of silica under Trade
Names such as "Ludox" (DuPont de Nemous Ltd.) and "Syton" (Monsanto Ltd.)
By way of further example alumina sols which may be used in accordance with the present invention include acidic sols of boehmite, formed by hydrolysis of aluminium alkoxides (e.g. as disclosed in B.P. 1,174,648) and also aqueous anion-deficient aluminium systems (e.g. aluminium chlorhydrate (Cl/AI = 0.5)) available from Albright and Wilson Ltd, may be used.
By way of further example acidic stannic oxide sols (formed as known in the literature by the peptisation of stannic hydroxide produced by precipitating stannic chloride solutions with ammonia) may be used.
Alkaline stannic oxide sols and related hydrous oxide sols may be used, for example, in accordance with the present invention; such sols may, for example, be made by a method disclosed in British
Patent Application Number 8321666 which discloses inter alia "a process for the preparation of a dispersion which comprises treating a chemical compound with a quaternary ammonium hydroxide to peptise the chemical compound to form a dispersion.
The coating composition may be formed by mixing together an aqueous colloidal dispersion and an aqueous emulsion of a polyacrylic ester (as hereinbefore defined).
Not all oxide sols are compatible with all coating aid dispersions. Some coating aid dispersions are sensitive to pH changes and to the presence of other ions. When mixing a colloidal dispersion and a coating aid dispersion to form a coating composition in accordance with the present invention it is advisable to reduce any pH difference between the two dispersions by addition of a suitable acid or base (e.g. acetic acid or ammonia) to one or the other.
Addition of further stabilising agents or protective colloids may also be beneficial. Selection of constituents to give suitable coating compositions may be readily carried out by routine experimentation.
Application of the coating composition to a substrate to be coated may be effected by any suitable coating technique examples of which are dipping, painting, spraying and spreading (e.g. by doctor blading). The coating composition ,after application to a substrate as a layer may be dried in any convenient manner. For example the applied coating composition may be dried in air (at temperatures preferably below 100"C to avoid water removal by boiling). Organic material may be removed, subsequently to drying, by heating in air at an elevated temperature.
Coatings prepared in accordance with the present invention find application for example in ceramic and electroceramics, and as catalysts or catalyst substrates (for example as disclosed in British Patent
Application No. 8300554).
Inorganic coatings may be formed in accordance with the present invention on any convenient substrate (e.g. a metallic surface or a ceramic surface).
The present invention further provides, in accordance with another aspect, a coating whenever prepared by a process in accordance with the present invention.
Also the invention provides a substrate and a coating whenever prepared by a process in accordance with the present invention.
The invention will now be further described, by way of example oniy, a follows in which Examples 1, 3 and 5 are comparative Examples and Examples 2,4 and 6 are in accordance with the present invention.
Example 1
A stannic oxide sol containing 262 gm SnO2 per litre was prepared by the method of British Patent
Application No. 8321666. Thus, 50gm of granulated tin metal (AR quality) were added in portions to a mixture of 200ml concentrated nitric acid and 150ml water contained in a beaker. After 48 hours the resulting clear supernate was decanted and the residue diluted with 900my of water. The resulting mixture was neutralised with ammonia and allowed to settle. The supernate was decanted and the residue filtered off, using a Buchnerfunnei and vacuum pump, and washed with water. The resulting washed cake was triturated at room temperature with 27gm of Quram XP61 (a 46.8 wt % aqueous solution of methyl triethanolammonium hydroxide sold by Emery Industries Inc. Pennsylvania USA.The resulting sol was centrifuged and then oxidised
Fecralloy (Registered Trade Mark) metal plates were coated with this sol by dipping, draining then dried and heated in air to 500"C. The resultant stannic oxide flim tended to detach from the metal surface.
Example 2
A mixture of 50ml of stannic oxide sol (as used in
Example 1) was mixed with a coating and comprising 1 Oml of Primal HA 8 (a polyacrylic ester aqueous latex ex Rohm and Haas UK Ltd.). The coating composition thus produced was used to coat similar
Fecralloy (Registered Trade Mark) metal to those used in Example 1 and these were heated as in
Example 1. Organic constituents of the coating composition were burnt off in air to leave a closely adherent cream coloured layer of stannic oxide.
Example 3
Glass microscope slides were coated with a silica sol (Syton (Trade MArk) X30 ex Monsanto Ltd.) by dipping, draining and drying in air. The resulting film, formed strands which detached from the slides merely by shaking.
Example 4
A coating composition was prepared by mixing 15 parts of Primal HA-8 (an aqueous polyacrylic ester latex with 45.5% solids content, marketed by Rohm and Haas UK Ltd) 1 part aqueous DC surfactant 193 ex Dow Corning Ltd.) and 45 parts of Syton (Trade
Mark) X30. This coating composition was used to coat glass microscope slides as in Example 3. During the drying in air, transparent films were formed which resisted abrasion and rubbing. When heated in air the film charred and aftercarbonous material has been burnt off a strongly adherent white film of silica remained.
Example 5
A titania sol was made by the general method of
British Patent Application No.8321666 by reacting tetrabutyl titanate with aqueous methyl triethanolammonium hydroxide (Quram Base XP 61 ex Emery
Industries Inc. of Pennsylvania, USA) as follows 100 gms of tetrabutyl titanate was added with stirring to 200 mls of water containing 50 gm of Quram XP61 (50% active agent). The resulting suspension was heated to boiling to remove butanol and the clear sol diluted with water to a volume of 400 ml.
Glass sheets were dipped into the resulting solution, drained and dried in air. The film formed was heated to remove organic residual material and the resultanttitania flaked away from the glass sheets.
Example 6
50 ml of so prepared as in Example 5 was mixed with 20ml of Primal LC-40. A glass plate was dipped into the resulting coating composition and drained and dried as in Example 6 to produce a film which, when heated in air to remove organic constituents, gave a white adherent layer of titanium oxide TiO2 on the glass sheet.
Claims (11)
1. A process for the preparation of an inorganic coating which comprises applying a coating composition to a substrate to form a layer thereon, said coating composition having been formed from a colloidal dispersion and an organic coating aid comprising an aqueous dispersion of a polyacrylic ester (as hereinbefore defined), drying the layerto form a dried coating and heating the dried coating to give an inorganic coating.
2. A process as claimed in Claim 1 wherein the coating aid comprises a polyacrylic ester.
3. A process as claimed in Claim 1 wherein the coating aid comprises polymethylmethacrylate, polybutylacrylate, polyacrylic acid or an acrylicstyrene copolymer.
4. A process as claimed in any one of the preceding claims wherein the colloidal dispersion comprises a sol.
5. A process as claimed in Claim 5 where the sol is a silica sol, a tin (IV) oxide sol, a titania sol or an alumina sol.
6. A process as claimed in any one of Claims 1 to 3 wherein the colloidal dispersion is an anion deficient solution.
7. A process as claimed in Claim 6 wherein the anion deficient solution is an aqueous anion defi cientsolution of aluminium chlorohydrate.
8. A process as claimed in any one of the preceding claims wherein the coating composition is applied to a substrate by dipping, painting, spraying or spreading.
9. A process for the preparation of an inorganic coating substantially as herein before described with reference to any one of Examples 2,4 or 6.
10. A coating whenever prepared by a process as claimed in any one of the preceding claims.
11. A substrate and a coating whenever prepared by a process as claimed in any one of Claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08400420A GB2134413B (en) | 1983-01-10 | 1984-01-09 | Coating process |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB838300554A GB8300554D0 (en) | 1983-01-10 | 1983-01-10 | Catalyst preparation |
| GB08334137A GB2134004B (en) | 1983-01-10 | 1983-12-22 | Catalyst preparation |
| GB08400420A GB2134413B (en) | 1983-01-10 | 1984-01-09 | Coating process |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8400420D0 GB8400420D0 (en) | 1984-02-08 |
| GB2134413A true GB2134413A (en) | 1984-08-15 |
| GB2134413B GB2134413B (en) | 1986-08-13 |
Family
ID=27261914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08400420A Expired GB2134413B (en) | 1983-01-10 | 1984-01-09 | Coating process |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2134413B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2209292A (en) * | 1987-08-31 | 1989-05-10 | Gen Electric | Application of conductive metallic film to a glass ceramic support surface |
| US4914071A (en) * | 1987-07-14 | 1990-04-03 | The British Petroleum Company P.L.C. | Method for preparing a catalyst |
| WO1999025474A1 (en) * | 1997-11-14 | 1999-05-27 | Engelhard Corporation | Catalytic structure and method of making the same |
| WO2000029108A1 (en) * | 1998-11-12 | 2000-05-25 | Abb Lummus Global Inc. | Attrition resistant thin film catalyst and method of preparation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1311889A (en) * | 1969-03-11 | 1973-03-28 | Owens Illinois Inc | Coating compositions based on liquid polymers and a coating process using them |
-
1984
- 1984-01-09 GB GB08400420A patent/GB2134413B/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1311889A (en) * | 1969-03-11 | 1973-03-28 | Owens Illinois Inc | Coating compositions based on liquid polymers and a coating process using them |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4914071A (en) * | 1987-07-14 | 1990-04-03 | The British Petroleum Company P.L.C. | Method for preparing a catalyst |
| GB2209292A (en) * | 1987-08-31 | 1989-05-10 | Gen Electric | Application of conductive metallic film to a glass ceramic support surface |
| WO1999025474A1 (en) * | 1997-11-14 | 1999-05-27 | Engelhard Corporation | Catalytic structure and method of making the same |
| US6019946A (en) * | 1997-11-14 | 2000-02-01 | Engelhard Corporation | Catalytic structure |
| WO2000029108A1 (en) * | 1998-11-12 | 2000-05-25 | Abb Lummus Global Inc. | Attrition resistant thin film catalyst and method of preparation |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2134413B (en) | 1986-08-13 |
| GB8400420D0 (en) | 1984-02-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |