EP1230986A1 - Procede d'application de revetement pulverulent a base de fluororesine thermodurcissable - Google Patents
Procede d'application de revetement pulverulent a base de fluororesine thermodurcissable Download PDFInfo
- Publication number
- EP1230986A1 EP1230986A1 EP99974085A EP99974085A EP1230986A1 EP 1230986 A1 EP1230986 A1 EP 1230986A1 EP 99974085 A EP99974085 A EP 99974085A EP 99974085 A EP99974085 A EP 99974085A EP 1230986 A1 EP1230986 A1 EP 1230986A1
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- EP
- European Patent Office
- Prior art keywords
- coating
- powder coating
- temperature
- coated
- article
- 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.)
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- 239000000843 powder Substances 0.000 title claims abstract description 54
- 238000000576 coating method Methods 0.000 title claims abstract description 43
- 229920001187 thermosetting polymer Polymers 0.000 title claims abstract description 38
- 239000011248 coating agent Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000008199 coating composition Substances 0.000 claims abstract description 49
- 229920005989 resin Polymers 0.000 claims abstract description 43
- 239000011347 resin Substances 0.000 claims abstract description 43
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 37
- 239000011737 fluorine Substances 0.000 claims abstract description 37
- 230000009477 glass transition Effects 0.000 claims abstract description 14
- 238000009503 electrostatic coating Methods 0.000 claims abstract description 9
- 239000003973 paint Substances 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 5
- 239000006223 plastic coating Substances 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 7
- 239000000758 substrate Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000007610 electrostatic coating method Methods 0.000 description 5
- -1 hexafluoropropylene, pentafluoropropylene Chemical group 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000000178 monomer Substances 0.000 description 4
- 229920000178 Acrylic resin Polymers 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 2
- 229910000165 zinc phosphate Inorganic materials 0.000 description 2
- SKYXLDSRLNRAPS-UHFFFAOYSA-N 1,2,4-trifluoro-5-methoxybenzene Chemical compound COC1=CC(F)=C(F)C=C1F SKYXLDSRLNRAPS-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- OZCMOJQQLBXBKI-UHFFFAOYSA-N 1-ethenoxy-2-methylpropane Chemical compound CC(C)COC=C OZCMOJQQLBXBKI-UHFFFAOYSA-N 0.000 description 1
- SLVOILNPGZPVOM-UHFFFAOYSA-N 1h-pyrano[3,2-b]pyrrole-2,3,5-trione Chemical compound C1=CC(=O)OC2=C1NC(=O)C2=O SLVOILNPGZPVOM-UHFFFAOYSA-N 0.000 description 1
- IZLFSDDOEKWVLD-UHFFFAOYSA-N 2-chloro-1,1,3,4,4,5,6,6,6-nonafluorohex-1-ene Chemical compound FC(C(F)(F)F)C(C(C(=C(F)F)Cl)F)(F)F IZLFSDDOEKWVLD-UHFFFAOYSA-N 0.000 description 1
- HMBNQNDUEFFFNZ-UHFFFAOYSA-N 4-ethenoxybutan-1-ol Chemical compound OCCCCOC=C HMBNQNDUEFFFNZ-UHFFFAOYSA-N 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- NRCMAYZCPIVABH-UHFFFAOYSA-N Quinacridone Chemical compound N1C2=CC=CC=C2C(=O)C2=C1C=C1C(=O)C3=CC=CC=C3NC1=C2 NRCMAYZCPIVABH-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical compound C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- 229910000004 White lead Inorganic materials 0.000 description 1
- AUNAPVYQLLNFOI-UHFFFAOYSA-L [Pb++].[Pb++].[Pb++].[O-]S([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Mo]([O-])(=O)=O Chemical compound [Pb++].[Pb++].[Pb++].[O-]S([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Mo]([O-])(=O)=O AUNAPVYQLLNFOI-UHFFFAOYSA-L 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 description 1
- 150000004056 anthraquinones Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical group FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical group FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 229910000398 iron phosphate Inorganic materials 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- MOUPNEIJQCETIW-UHFFFAOYSA-N lead chromate Chemical compound [Pb+2].[O-][Cr]([O-])(=O)=O MOUPNEIJQCETIW-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 150000007519 polyprotic acids Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/06—Applying particulate materials
-
- 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
- B05D3/0218—Pretreatment, e.g. heating the substrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
- B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
Definitions
- the present invention relates to a coating method characterized by pre-treatment of an article to be coated by electrostatic coating of a thermosetting fluorine-containing resin powder coating composition.
- thermoplastic powder coating compositions prepared by using thermoplastic resins (JP-A-9-302306, etc.) and thermosetting powder coating compositions prepared by using thermosetting resins.
- thermosetting powder coating compositions there are known those comprising a general-purpose resin such as polyester, acrylic resin or epoxy resin as a resin component and those comprising a thermosetting fluorine-containing resin as a resin component (JP-B-6-104792, etc.).
- the fluidized bed coating method is a method of coating by dipping a heated substrate into a powder coating composition, and in many cases, is used for thick coating of thermoplastic powder coating compositions.
- the electrostatic coating method is a method of spraying a statically charged powder coating composition onto a substrate and in many cases, is used for thermosetting powder coating compositions.
- thermosetting fluorine-containing resin powder coating composition is easily subject to electric repellence between the particles of powder coating composition due to a high static charge inherent to the fluorine-containing resin to lower an adhesion efficiency of the coating composition, unlike general-purpose resin powder coating compositions.
- problems of the thermosetting fluorine-containing resin powder coating composition means to-solve them are not known.
- JP-B-6-104792 discloses an electrostatic coating method of a thermosetting fluorine-containing resin powder coating composition, but there is no suggestion as to improvements in an adhesion efficiency and a coating method.
- An object of the present invention is to provide an electrostatic coating method for improving the both of an adhesion efficiency of a thermosetting fluorine-containing resin powder coating composition and an appearance of a coating film such as smoothness.
- the present invention relates to the electrostatic coating method of a thermosetting fluorine-containing resin powder coating composition by previously heating an article to be coated to a temperature in a range higher than a glass transition temperature of the powder coating composition and up to a temperature higher than a curing starting temperature by 10°C.
- a surface of the article to be coated is a surface of metal subjected to chemical conversion treatment or a surface of metal subjected to plastic coating or coating with a paint. It is particularly preferable that the surface is subjected to coating with an aqueous paint.
- thermosetting fluorine-containing resin powder coating composition in the coating method of the present invention, known electrostatic coating equipment and electrostatic coating conditions can be employed except that the article to be coated is previously heated to a temperature in a range higher than a glass transition temperature of the thermosetting fluorine-containing resin powder coating composition and up to a temperature higher than a curing starting temperature by 10°C.
- the glass transition temperature means a glass transition temperature of a thermosetting fluorine-containing resin to be used as a resin component of the powder coating composition and is an inherent physical property of the thermosetting fluorine-containing resin.
- the glass transition temperature of the thermosetting fluorine-containing resin to be used for the thermosetting fluorine-containing resin powder coating composition is a temperature higher than room temperature, usually 30° to 70°C.
- the curing starting temperature means a temperature where the curing reaction starts.
- the curing starting temperature is a temperature which is determined by a combination of the thermosetting fluorine-containing resin and the curing agent and is higher than the glass transition temperature.
- the curing starting temperature is usually from 120° to 150°C in case of the generally used thermosetting fluorine-containing resin powder coating compositions.
- thermosetting fluorine-containing resin powder coating composition When a temperature of the article to be coated is not more than a glass transition temperature of thermosetting fluorine-containing resin powder coating composition at electrostatic coating, adhesion of the powder coating composition to the article to be coated is insufficient and an adhesion efficiency is not enhanced.
- a lower limit of the heating temperature of the article to be coated is a temperature higher than the glass transition temperature preferably by 5°C, further preferably by 10°C.
- An upper limit of the heating temperature of the article to be coated is a temperature higher than the curing starting temperature by 10°C. When higher than the upper limit temperature, the curing reaction advances quickly and the curing starts before the applied coating composition flows. Thus a surface of the obtained coating film does not become smooth.
- the upper limit of the heating temperature is preferably a temperature higher than the curing starting temperature by 5°C, further preferably the curing starting temperature.
- thermosetting fluorine-containing resin powder coating composition generally has a lower adhesive property to an article to be coated, particularly to a metallic substrate as compared with general-purpose resin powder coating compositions. Therefore in order to further enhance an effect of the present invention, it is preferable that a surface of the article to be coated is subjected to a specific treatment.
- a surface of the substrate to be coated is subjected to chemical conversion treatment or subjected to plastic coating or coating with a paint. It is particularly preferable that the surface is subjected to coating with an aqueous paint from the viewpoint of enhancement of adhesion of the composition to the metallic substrate and excellent environmental protection.
- Examples of the preferred chemical conversion treatment are dipping in zinc phosphate, iron phosphate, chromate, chromic acid and chromate phosphate and spraying thereof.
- plastic coating treatment examples include coating with polyamide, polyolefin, polyester, polyvinyl chloride, polyvinylidene fluoride, and the like.
- Examples of the coating with a paint are coating of an aqueous paint comprising a thermosetting acrylic resin, polyester resin, urethane resin, epoxy resin or the like in a coating thickness of 1 to 50 ⁇ m, and the like.
- thermosetting fluorine-containing resin powder coating composition to be used in the present invention is a usual thermosetting fluorine-containing resin powder coating composition basically comprising a thermosetting fluorine-containing resin powder, a curing agent and as case demands, a pigment and various additives.
- thermosetting fluorine-containing resin as a resin component is not limited particularly as far as the resin is a polymer having a fluorine-containing monomer unit and a crosslinkable reactive group as essential components.
- fluorine-containing monomer examples include, for instance, one or two or more of tetrafluoroethylene, chlorotrifluoroethylene, trifluoroethylene, vinylidene fluoride, hexafluoropropylene, pentafluoropropylene, perfluoro(vinyl ether), monofluoroethylene, and the like.
- the fluorine-containing monomer may be copolymerized with a non-fluorine-containing monomer, as case demands.
- crosslinkable reactive group examples include hydroxyl group, carboxyl group, amino group, amido group, isocyanate group, halogen atoms such as bromine and iodine, and the like.
- thermosetting fluorine-containing resin for example, an epoxy resin, acrylic resin, polyester resin, or the like may be blended as a powder resin component.
- thermosetting powder coating compositions those which have been used for thermosetting powder coating compositions can be used.
- examples thereof are, for instance, a blocked isocyanate compound, acid anhydride, polyamine compound, glycidyl compound, isocyanurate compound, polybasic acid, and the like.
- the pigment examples include organic pigments such as condensed azo compound, isoindolenone, quinacridone, diketopyrrolopyrol, anthraquinone and dioxane; inorganic oxide pigments such as titanium oxide, iron oxide, carbon black, chromium oxide, lead chromate, white lead and molybdenum orange; metal powders such as aluminum powder and stainless steel powder; and the like.
- organic pigments such as condensed azo compound, isoindolenone, quinacridone, diketopyrrolopyrol, anthraquinone and dioxane
- inorganic oxide pigments such as titanium oxide, iron oxide, carbon black, chromium oxide, lead chromate, white lead and molybdenum orange
- metal powders such as aluminum powder and stainless steel powder; and the like.
- additives which are usually used for powder coating compositions may be optionally blended.
- examples thereof are, for instance, a filler, ultraviolet ray absorber, leveling agent, flowability control agent, antioxidant, heat deterioration preventive agent, gloss control agent, electrostatic charge control agent, and the like.
- thermosetting fluorine-containing resin powder coating composition which can be used suitably in the method of the present invention are, for instance, powder coating compositions prepared by using thermosetting fluorine-containing resins which are described in JP-B-6-104792, JP-A-5-331388, Japanese Patent No. 2782726, etc. and have a relatively low glass transition temperature.
- a method and conditions for imparting an electrostatic charge to the powder coating composition may be those usually employed.
- a frictional electrification method and corona electrical charging method are suitable for imparting an electrostatic charge at electrostatic powder coating. Since a fluorine-containing resin is easily charged with negative electricity, the corona electrical charging method is suitable.
- a suitable applied voltage is from 20 to 80 kV, further 40 to 60 kV. When the voltage is too high, a surface of the coating film easily becomes rough, and when too low, an adhesion efficiency is lowered.
- thermosetting fluorine-containing resin powder coating composition Preparation of thermosetting fluorine-containing resin powder coating composition
- thermosetting fluorine-containing resin powder was prepared by pulverizing a chlorotrifluoroethylene/cyclohexyl vinyl ether/isobutyl vinyl ether/hydroxybutyl vinyl ether (weight ratio: about 50/16/9/25) copolymer (hydroxyl value: 120 mgKOH/g, glass transition temperature: 45°C, weight reduction by heating: 2 % by weight or less, intrinsic viscosity ( ⁇ ) measured in tetrahydrofuran at 30°C: 0.21) with an impact hammer mill.
- thermosetting fluorine-containing resin powder coating composition to be used in Examples was prepared.
- thermosetting fluorine-containing resin With respect to the glass transition temperature of the thermosetting fluorine-containing resin, a heat balance was measured by heating 10 mg of sample from -25°C to 200°C at a temperature increasing rate of 10°C/min by using Thermal Analysis System available from Perkin Elmer Co., Ltd. and a temperature at a center point between the two variable polar points was assumed to be a glass transition temperature.
- a curing starting temperature of the obtained powder coating composition was measured with a pendulum viscometer (DDV-OPA) available from Orientec Corporation.
- the curing starting temperature was 140°C.
- a pre-heating temperature of an article to be coated is within a temperature range higher than 45°C and not more than 150°C.
- a steel sheet subjected to zinc phosphate treatment in a thickness of 0.8 mm was coated with an aqueous polyurethane resin paint (VD100N available from Mitsui Toatsu Kagaku Kabushiki Kaisha) in a thickness of 10 ⁇ m to give an article to be coated.
- the article to be coated was heated to 100°C and immediately mounted in a booth provided with a corona discharge gun (GX3300 available from Onoda Cement Kabushiki Kaisha), followed by electrostatic coating of the above-mentioned powder coating composition at an applied voltage of 60 kV.
- an adhesion efficiency (%) (Total amount of adhered composition (g)/Effective amount of discharged composition (g)) ⁇ 100) was 75 %.
- Electrostatic coating and baking were carried out in the same manner as in Example 1 except that the following articles to be coated were used and the articles were heated to a temperature shown in Table 1. An adhesion efficiency and characteristics of the coating film were evaluated. The results are shown in Table 1.
- Example 2 The same steel sheet as in Example 1 which is subjected to chemical conversion treatment with phosphate but not subjected to coating with a urethane resin paint
- Example 3 A steel sheet which is not subjected to any treatment
- Comparative Examples 1 and 2 The same steel sheet as in Example 1 which is coated with a urethane resin paint
- the coating method of the present invention since an adhesion efficiency per one coating is enhanced, the number of coats until a desired coating thickness is obtained can be decreased and productivity is enhanced. Also since a smoothness of a surface of coating film is excellent, a coated article having good appearance can be provided.
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- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP1999/005461 WO2001024944A1 (fr) | 1999-10-04 | 1999-10-04 | Procede d'application de revetement pulverulent a base de fluororesine thermodurcissable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1230986A1 true EP1230986A1 (fr) | 2002-08-14 |
Family
ID=14236902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99974085A Withdrawn EP1230986A1 (fr) | 1999-10-04 | 1999-10-04 | Procede d'application de revetement pulverulent a base de fluororesine thermodurcissable |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1230986A1 (fr) |
| AU (1) | AU6002699A (fr) |
| WO (1) | WO2001024944A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10139971A1 (de) * | 2001-08-21 | 2003-03-27 | Rodenstock Optik G | Optische Linse oder Glas mit einer Kennzeichnung und/oder Markierung auf der Vorder- und/oder Rückfläche |
| KR102552900B1 (ko) | 2015-12-24 | 2023-07-07 | 엘지전자 주식회사 | 이슬맺힘방지부재의 제조방법 및 이를 구비한 냉장고와 증발기 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61111335A (ja) * | 1984-11-05 | 1986-05-29 | Dainippon Toryo Co Ltd | プラスチツク成形方法 |
| IE67143B1 (en) * | 1991-01-10 | 1996-03-06 | Bhp Steel Jla Pty Ltd | Method and apparatus for continuously coating a moving metal strip |
| JPH07148458A (ja) * | 1993-09-17 | 1995-06-13 | Nippon Paint Co Ltd | 塗装方法 |
-
1999
- 1999-10-04 AU AU60026/99A patent/AU6002699A/en not_active Abandoned
- 1999-10-04 EP EP99974085A patent/EP1230986A1/fr not_active Withdrawn
- 1999-10-04 WO PCT/JP1999/005461 patent/WO2001024944A1/fr not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0124944A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001024944A1 (fr) | 2001-04-12 |
| AU6002699A (en) | 2001-05-10 |
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