WO2011033655A1 - 樹脂被覆金属顔料、およびその製造方法 - Google Patents
樹脂被覆金属顔料、およびその製造方法 Download PDFInfo
- Publication number
- WO2011033655A1 WO2011033655A1 PCT/JP2009/066392 JP2009066392W WO2011033655A1 WO 2011033655 A1 WO2011033655 A1 WO 2011033655A1 JP 2009066392 W JP2009066392 W JP 2009066392W WO 2011033655 A1 WO2011033655 A1 WO 2011033655A1
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- WIPO (PCT)
- Prior art keywords
- resin
- metal pigment
- coated metal
- weight
- pigment
- Prior art date
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- 239000000049 pigment Substances 0.000 title claims abstract description 165
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 154
- 239000002184 metal Substances 0.000 title claims abstract description 154
- 239000011347 resin Substances 0.000 title claims abstract description 143
- 229920005989 resin Polymers 0.000 title claims abstract description 143
- 238000000034 method Methods 0.000 title description 19
- 238000000576 coating method Methods 0.000 claims abstract description 43
- 239000011248 coating agent Substances 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 33
- 239000002245 particle Substances 0.000 claims description 31
- 239000007788 liquid Substances 0.000 claims description 30
- 229910052782 aluminium Inorganic materials 0.000 claims description 25
- 238000004519 manufacturing process Methods 0.000 claims description 22
- 230000003746 surface roughness Effects 0.000 claims description 22
- 239000003973 paint Substances 0.000 claims description 18
- 238000011156 evaluation Methods 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000011164 primary particle Substances 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 4
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- 230000000052 comparative effect Effects 0.000 description 9
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
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- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
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- XRMBQHTWUBGQDN-UHFFFAOYSA-N [2-[2,2-bis(prop-2-enoyloxymethyl)butoxymethyl]-2-(prop-2-enoyloxymethyl)butyl] prop-2-enoate Chemical compound C=CC(=O)OCC(COC(=O)C=C)(CC)COCC(CC)(COC(=O)C=C)COC(=O)C=C XRMBQHTWUBGQDN-UHFFFAOYSA-N 0.000 description 2
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- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
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- 239000003429 antifungal agent Substances 0.000 description 1
- 229940121375 antifungal agent Drugs 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
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- 125000003118 aryl group Chemical group 0.000 description 1
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- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 description 1
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- 125000004122 cyclic group Chemical group 0.000 description 1
- OIWOHHBRDFKZNC-UHFFFAOYSA-N cyclohexyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC1CCCCC1 OIWOHHBRDFKZNC-UHFFFAOYSA-N 0.000 description 1
- KBLWLMPSVYBVDK-UHFFFAOYSA-N cyclohexyl prop-2-enoate Chemical group C=CC(=O)OC1CCCCC1 KBLWLMPSVYBVDK-UHFFFAOYSA-N 0.000 description 1
- 125000004386 diacrylate group Chemical group 0.000 description 1
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- GMSCBRSQMRDRCD-UHFFFAOYSA-N dodecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCOC(=O)C(C)=C GMSCBRSQMRDRCD-UHFFFAOYSA-N 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- UIWXSTHGICQLQT-UHFFFAOYSA-N ethenyl propanoate Chemical compound CCC(=O)OC=C UIWXSTHGICQLQT-UHFFFAOYSA-N 0.000 description 1
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 description 1
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 1
- WOXXJEVNDJOOLV-UHFFFAOYSA-N ethenyl-tris(2-methoxyethoxy)silane Chemical compound COCCO[Si](OCCOC)(OCCOC)C=C WOXXJEVNDJOOLV-UHFFFAOYSA-N 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 description 1
- STVZJERGLQHEKB-UHFFFAOYSA-N ethylene glycol dimethacrylate Substances CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
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- 125000000524 functional group Chemical group 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
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- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
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- 239000011261 inert gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- HMZGPNHSPWNGEP-UHFFFAOYSA-N octadecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)=C HMZGPNHSPWNGEP-UHFFFAOYSA-N 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- RPQRDASANLAFCM-UHFFFAOYSA-N oxiran-2-ylmethyl prop-2-enoate Chemical compound C=CC(=O)OCC1CO1 RPQRDASANLAFCM-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
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- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002589 poly(vinylethylene) polymer Polymers 0.000 description 1
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- 239000000047 product Substances 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
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- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- GQIUQDDJKHLHTB-UHFFFAOYSA-N trichloro(ethenyl)silane Chemical compound Cl[Si](Cl)(Cl)C=C GQIUQDDJKHLHTB-UHFFFAOYSA-N 0.000 description 1
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- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
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
- B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- 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
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/16—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with particles being subjected to vibrations or pulsations
-
- 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
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/62—Metallic pigments or fillers
- C09C1/64—Aluminium
- C09C1/644—Aluminium treated with organic compounds, e.g. polymers
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/60—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes
-
- 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
- B05D2202/00—Metallic 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
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/04—Particle morphology depicted by an image obtained by TEM, STEM, STM or AFM
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/10—Treatment with macromolecular organic compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
- Y10T428/2998—Coated including synthetic resin or polymer
Definitions
- the present invention relates to a novel resin-coated metal pigment and a method for producing the same, and more specifically, when used as a pigment for paint, adhesion and chemical resistance are maintained while maintaining an unprecedented excellent metallic luster and design.
- the present invention also relates to a metal pigment that gives an excellent metallic coating film and a method for producing the same.
- metal pigments have been used for metallic paints, printing inks, plastics kneading, etc. for the purpose of obtaining a cosmetic effect that emphasizes a metallic feeling.
- aluminum pigments that have not undergone any treatment on the surface have a high metallic feel and design, but depending on the resin system of the paint and printing ink, the adhesiveness with the resin in the coating film is inferior.
- the adhesion test was conducted, there was a drawback that a large amount was peeled off and there was no protective function against chemicals.
- flaky aluminum powder which is an aluminum pigment, or a paste of flaky aluminum powder is dispersed in an organic solvent, and first, radically polymerizable unsaturated carboxylic acid or the like is adsorbed to the powder, and then radically polymerizable.
- a method has been proposed in which the surface of the powder is coated with a polymer produced from a monomer having three or more double bonds.
- this method improves the adhesion, it is necessary to add a considerable amount of the monomer to be coated in order to realize the chemical resistance of the metallic coating, which is the original main purpose. There is a problem that the metallic feeling is lowered and the design property is remarkably lowered.
- Patent Document 2 discloses a uniform and highly three-dimensional cross-linked coating film in which the surface coating method is improved in order to prevent color tone deterioration of the resin-coated metal pigment and to further improve chemical resistance and weather resistance. There has been proposed a method for forming the film. However, even with this method, although the metal feeling and the deterioration in design are improved to some extent, it is considerably inferior to the color tone of the metal pigment not subjected to the surface coating treatment, and is not sufficient.
- the average particle size after the resin coating treatment is significantly larger than that before the treatment, There is a problem that the color tone such as concealing property and flip-flop feeling is remarkably lowered.
- Patent Document 3 discloses a method using ultrasonic waves when coating mica with resin.
- aluminum pigments are not mentioned, and there are no descriptions regarding color tone, chemical resistance, and adhesion, which are important physical properties of aluminum pigments.
- the present invention provides a resin-coated metal pigment that eliminates the disadvantages of the prior art as described above, and a new method for producing the same, that is, there is little reduction in color tone such as glossiness, concealment, and flip-flop feeling due to resin coating.
- Another object of the present invention is to provide a resin-coated metal pigment having excellent adhesion and chemical resistance and a new production method thereof.
- the present inventors obtain a resin-coated metal pigment having excellent color tone, adhesion, and chemical resistance by adding an external action such as ultrasonic irradiation during resin coating treatment that has not been studied in the past.
- the present inventors have found a production method that enables this and completed the present invention.
- the present invention is as follows. (1) A resin-coated metal pigment in which 0.1 to 50 parts by weight of a resin is attached to the surface of the metal pigment with respect to 100 parts by weight of the metal pigment, and the resin coating process is performed during the resin coating process in a reaction vessel. A resin-coated metal pigment obtained by circulating a part of a slurry liquid containing a metal pigment in an external circulation type container, and applying an ultrasonic vibration treatment to the external circulation type container.
- the resin-coated metal pigment according to (1) obtained by (3) A resin-coated metal pigment in which the difference between the average particle size of the resin-coated metal pigment particles and the average particle size of the metal pigment particles before resin coating is greater than 0 and 5 ⁇ m or less.
- Ratio of the number of particles aggregate (A) formed of two or more primary particles in the resin-coated metal pigment to the number of non-aggregated primary particles (B), B / (A + B) ) Is a resin-coated metal pigment.
- the resin-coated metal pigment, wherein the unevenness of the resin coating layer adhering to the surface of the resin-coated metal pigment is 25 nm or less.
- a resin-coated metal pigment having an average surface roughness Ra of the resin-coated metal pigment of 20 nm or less and an average height Rc of irregularities of the surface roughness curve of 80 nm or less.
- a method for producing a resin-coated metal pigment comprising applying vibration.
- a part of the slurry liquid containing the metal pigment is circulated in an external circulation type container, an ultrasonic vibrator is attached directly to the outside of the external circulation type container, and ultrasonic waves are applied to the internal slurry liquid through an external wall.
- the resin-coated metal pigment of the present invention is a resin-coated metal having excellent color tone, adhesion, and chemical resistance obtained by adding an external action such as ultrasonic irradiation to an external circulation device during resin coating treatment. Pigment.
- the color tone is almost the same as that when a metal pigment before resin coating is used, and a coating film excellent in adhesion and chemical resistance is obtained. Can do.
- Example 1 is a schematic diagram of an experimental apparatus used in Example 1.
- FIG. 6 is a schematic diagram of an experimental apparatus used in Example 4.
- FIG. 10 is a schematic diagram of an experimental apparatus used in Example 7.
- 6 is an example of a TEM photograph of a resin-coated metal pigment of Example 5.
- 2 is an example of a TEM photograph of a resin-coated metal pigment of Comparative Example 1.
- the method for producing a resin-coated metal pigment includes dispersing a metal pigment particle in a solvent and adding a monomer and / or oligomer having one or more double bonds in the molecule while adding an external vibrational action. Further, the polymerization reaction is performed by adding a polymerization initiator, and the resin is coated on the surface of the metal pigment particles.
- the polymerization reaction conditions are preferably 50 to 150 ° C. for 5 minutes to 12 hours. In order to increase the polymerization efficiency, it is desirable to perform polymerization in an inert gas atmosphere such as nitrogen or helium.
- the organic solvent may be filtered off, the non-volatile content may be adjusted to 20 to 80%, and other solvents and additives may be added as necessary to make a paste.
- the metal pigment used in the present invention it is preferable to use base metal powders such as aluminum, zinc, iron, magnesium, copper, nickel, and alloy powders thereof. Particularly preferred are aluminum powders that are frequently used as metallic pigments.
- aluminum powders used in the present invention those having surface properties, particle sizes, and shapes required for metallic pigments such as surface gloss, whiteness, and glitter are suitable.
- the shape may be various shapes such as a granular shape, a plate shape, a lump shape, and a scaly shape, but a scaly shape is preferable in order to give an excellent metallic feeling and luminance to the coating film.
- a material having a thickness in the range of 0.001 to 1 ⁇ m and a length or width in the range of 1 to 100 ⁇ m is preferable.
- the aspect ratio is preferably in the range of 10 to 20000.
- the aspect ratio is a value obtained by dividing the average major axis of the scaly aluminum powder by the average thickness of the aluminum powder.
- the purity of the aluminum powder is not particularly limited, but the purity used for coating is 99.5% or more.
- Aluminum powder is usually marketed in a paste state, and it is preferable to use it.
- the resin used in the present invention is preferably obtained by polymerizing a monomer and / or oligomer having one or more double bonds in the molecule.
- the monomer having one or more double bonds is not particularly limited, and conventionally known monomers can be used. Specific examples include unsaturated carboxylic acids (eg, acrylic acid, methacrylic acid, itaconic acid, fumaric acid, citraconic acid, crotonic acid, maleic acid or maleic anhydride), mono- or diesters of phosphoric acid or phosphonic acid (eg 2-methacryloyloxyethyl phosphate, di-2-methacryloyloxyethyl phosphate, tri-2-methacryloyloxyethyl phosphate, 2-acryloyloxyethyl phosphate, di-2-acryloyloxyethyl phosphate, tri-2- Acryloyloxyethyl phosphate, diphenyl-2-acryloyloxyethyl phosphate, dibutyl-2-methacryloyloxyethyl phosphate, dioctyl-2-acryloyloxyethyl
- cyclic unsaturated compounds for example, cyclohexene
- aromatic unsaturated compounds for example, styrene, ⁇ -methylstyrene, vinyltoluene, divinylbenzene, cyclohexene vinyl monooxide, divinylbenzene monooxide, vinyl acetate,
- vinyl propionate, allylbenzene or diallylbenzene are also suitable.
- unsaturated compounds having a functional group containing fluorine, silicon, nitrogen, etc. can be used.
- oligomer having one or more double bonds in the molecule examples include epoxidized 1,2-polybutadiene, acrylic-modified polyester, acrylic-modified polyether, acrylic-modified urethane, acrylic-modified epoxy, and acrylic-modified spyrane. Alternatively, two or more kinds can be mixed and used.
- the amount of the monomer and / or oligomer having one or more double bonds in the molecule is 0.1 to 50 parts by weight with respect to 100 parts by weight of the metal content of the metal pigment. Preferably, it is 1 to 30 parts by weight.
- the organic solvent used to disperse the metal pigment in the organic solvent may be inert to the metal pigment, such as aliphatic hydrocarbons such as hexane, heptane, octane, mineral spirit, benzene, toluene, xylene.
- aliphatic hydrocarbons such as hexane, heptane, octane, mineral spirit, benzene, toluene, xylene.
- Aromatic hydrocarbons such as solvent naphtha, ethers such as tetrahydrofuran and diethyl ether, alcohols such as ethanol, 2-propanol and butanol, esters such as ethyl acetate and butyl acetate, glycols such as propylene glycol and ethylene glycol , Glycol ethers such as propylene glycol monomethyl ether, propylene glycol monoethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether acetate , Propylene glycol monoethyl ether acetate, glycol esters such as ethylene glycol monomethyl ether acetate.
- These organic solvents may be used alone or in combination of two or more.
- the concentration of the metal pigment in the organic solvent is preferably 0.1 to 40% by weight, more preferably 1 to 35% by weight. In terms of efficiently performing resin coating on the metal pigment, the concentration of the metal pigment in the organic solvent is preferably 0.1% by weight or more. In addition, the concentration of the metal pigment in the organic solvent is preferably 40% by weight or less from the viewpoint of keeping the dispersed state of the metal pigment uniform.
- the organic solvent is also used as a reaction solvent for forming a resin by polymerizing a monomer and / or oligomer having one or more double bonds in the molecule.
- the polymerization initiator used in the present invention is generally known as a radical generator, and the type thereof is not particularly limited.
- the polymerization initiator include peroxides such as benzoyl peroxide, lauroyl peroxide, bis- (4-tert-butylcyclohexyl) peroxydicarbonate, and 2,2′-azobis-isobutyronitrile, 2,2 ′.
- -Azo compounds such as azobis-2,4-dimethylvaleronitrile.
- the amount used is not particularly limited because it is adjusted depending on the reaction rate of the polymerizable monomer, but it is preferably 0.1 to 25 parts by weight with respect to 100 parts by weight of the metal pigment.
- the shear external action refers to an action that promotes physical dispersion by applying a high shear force when dispersing a metal pigment in an organic solvent and when adding a monomer to the dispersion.
- a method therefor for example, there is a method of dispersing a metal pigment or monomer using a disper or a stirrer.
- the vibration external action is an action that mechanically vibrates the dispersion liquid or the slurry liquid during the polymerization reaction using a vibration generator or an ultrasonic generator to promote physical dispersion. is there.
- an apparatus for applying a vibration external action includes 1) directly applying an ultrasonic wave generated from an ultrasonic vibrator to a slurry liquid in an external circulation type container via an ultrasonic horn. 2) Attaching an ultrasonic vibrator directly to the outside of the external circulation container and applying ultrasonic waves to the slurry liquid inside through the wall of the external circulation container 3) Outside of the external circulation container
- the ultrasonic vibrator is directly attached to the inside, and the inside is filled with an appropriate solvent, and the ultrasonic wave is added to the slurry liquid by passing through the piping in which the slurry liquid circulates.
- the external circulation type container to which the ultrasonic vibrator is attached is referred to as a circulation type ultrasonic dispersion machine.
- the capacity of the external circulation container is not limited, but is preferably 0.0001 to 10 times, more preferably 0.001 to 2 times the capacity of the reaction tank to be connected.
- a part of the slurry liquid during the polymerization reaction in the reaction tank is circulated to the external circulation type container, and intermittently added to the external circulation type container, Various methods such as a method of adding continuously and a method of combining intermittent addition and continuous addition can be used.
- the number of circulating ultrasonic dispersers is not particularly limited, but a plurality of circulating ultrasonic dispersers are preferably installed.
- a plurality of circulating ultrasonic dispersers are used at the same time, it is possible to apply a series type or a parallel type as a connection method with the reaction vessel. From the viewpoint of production efficiency, the parallel type is preferable, and from the viewpoint of the dispersion efficiency of the metal pigment, the series type is preferable.
- the external action ultrasonic wave used in the present invention is a kind of elastic vibration transmitted through an elastic body, and is usually a longitudinal wave in which compression and expansion are transmitted in the traveling direction of the wave. There may be shear waves on the surface. It should be noted that sound waves that are not intended to be heard directly are also included in the ultrasonic waves as a technical definition, and all sound waves that are transmitted through the surface and inside of liquids and solids are also included in the ultrasonic waves.
- an ultrasonic wave having a frequency of 15 to 10000 kHz, preferably 20 to 3000 kHz, particularly preferably 30 to 1000 kHz is desirable.
- the output is 5 to 20000 W, preferably 10 to 10000 W, particularly preferably 12 to 6000 W.
- the resin-coated metal pigment of the present invention is characterized in that there is almost no decrease in the glitter and concealment properties of the coating film as compared to the metal pigment before resin coating. This is presumably because the resin can be coated more densely and uniformly on the surface of the metal pigment particles under an unprecedented suitable dispersion state of the metal pigment particles.
- the uniformity can be evaluated by measuring the unevenness of the surface of the resin-coated metal pigment, the average surface roughness Ra, and the average height Rc of the unevenness of the surface roughness curve.
- the surface unevenness is measured by the method shown below.
- the resin-coated metal pigment is subjected to ultrasonic cleaning with excess methanol and chloroform, then vacuum-dried, dispersed and washed again in acetone, and then naturally dried. Then, after embedding with epoxy resin and completely curing, trimming and sectioning are performed, and the cross section is observed with a transmission electron microscope (hereinafter abbreviated as TEM), and the concave and convex portions on the surface of the resin coating layer are observed. Measure the difference in height.
- TEM transmission electron microscope
- the unevenness of the resin-coated metal pigment is preferably 25 ⁇ m or less, and more preferably 15 ⁇ m or less.
- the average surface roughness Ra referred to in the present invention is calculated by the following method.
- AFM atomic force microscope
- TMX-2010 manufactured by Topometrix
- the resin-coated metal pigment of the sample is subjected to ultrasonic cleaning with excess methanol and chloroform, then vacuum-dried, dispersed again in acetone, dropped onto a Si wafer, and naturally dried.
- Quantification of the surface roughness by AFM is to measure the surface roughness curve (surface profile of the surface irregularities) by 300 scans per 5 ⁇ m square field for the resin-coated metal pigment that does not overlap with other resin-coated metal pigments,
- the arithmetic mean roughness (arithmetic mean of the absolute value of the altitude within the standard length of 5 ⁇ m) is determined. Reference length, depending on the average particle size d 50, referenced to 5 [mu] m.
- the arithmetic average roughness is measured by three or more visual fields, and the value obtained by arithmetic averaging is defined as “average surface roughness Ra (nm)”.
- the term surface roughness is based on JIS-B-0660: 1998.
- the average surface roughness Ra of the resin-coated metal pigment of the present invention is usually 20 nm or less, preferably 15 nm or less.
- the thickness was 20 nm or less, the regular reflectance of light on the surface was large, so that it showed extremely excellent light luminance and good flop.
- the average height Rc of the unevenness of the surface roughness curve of the resin-coated metal pigment is the average value of the absolute value of the peak height of the surface roughness curve and the valley bottom of the surface roughness curve in the surface roughness curve measured above. It is expressed as the sum of the average values of the absolute values of the depths. Specifically, it refers to a value obtained by measuring the arithmetic average height of the surface roughness curve by three or more visual fields and further arithmetically averaging them.
- the average height Rc of the resin-coated metal pigment of the present invention is preferably 80 nm or less, and more preferably 70 nm or less. When the average height Rc was 80 nm or less, extremely high luminance was exhibited and the flop property was also good.
- the difference between the average particle size of the resin-coated metal pigment particles and the average particle size of the metal pigment before resin coating is preferably greater than 0 and 5 ⁇ m or less.
- the resin-coated metal pigment of the present invention is coated with a finer and more uniform resin than the conventional resin on the surface of the metal pigment particles, when the resin-coated metal pigment is dispersed in a water-based paint, The amount of gas generation has been improved.
- the color difference ⁇ E is preferably less than 1.0.
- the gas generation amount measured by the method described in Examples is preferably 10 ml or less, and more preferably 6 ml or less.
- the resin-coated metal pigment of the present invention is suitably used for automobiles, general household appliances, information household appliances typified by mobile phones, printing, metals such as iron and magnesium alloys, and coatings of base materials such as plastics. And high design properties.
- additives such as antifoaming agents, thickeners, anti-sagging agents, antifungal agents, ultraviolet absorbers, film-forming aids, surfactants, etc. may be appropriately added to the novel resin-coated metal pigments of the present invention. .
- Example 1 In a 20L reactor 1500g of commercially available aluminum paste (Manufactured by Asahi Kasei Chemicals Corporation, GX-5060 “average particle size 6 ⁇ m, non-volatile content 72%”), and mineral spirit 8300 g was charged into the reaction vessel. And it stirred, introducing nitrogen gas, and raised the temperature in a system to 70 degreeC. Next, 4.3 g of acrylic acid was added and stirring was continued for 30 minutes. Thereafter, the slurry was connected to a commercially available circulating ultrasonic disperser, and the slurry liquid in the reaction vessel was circulated at a rate of about 1 l / min by a metering pump.
- aluminum paste Manufactured by Asahi Kasei Chemicals Corporation, GX-5060 “average particle size 6 ⁇ m, non-volatile content 72%”
- mineral spirit 8300 g was charged into the reaction vessel. And it stirred, introducing nitrogen gas, and raised the temperature in a system to 70 degreeC. Next,
- This circulating ultrasonic disperser is a type that directly irradiates the slurry liquid in the container with ultrasonic waves through an ultrasonic horn.
- a schematic diagram of the experimental apparatus used in Example 1 is shown in FIG. 100 ml of slurry liquid was always held in the container, and the slurry liquid circulated in the container was directly irradiated with ultrasonic waves having a frequency of 20 kHz and an output of 200 W for 60 minutes.
- Trimethylolpropane trimethacrylate 110.2g 48.6 g of di-trimethylolpropane tetraacrylate 2,2'-azobis-2,4-dimethylvaleronitrile 29.2g , And Mineral Spirit 1200g A solution consisting of And about 7.9 g / min. The solution was added to the reaction vessel at a rate of and polymerization was carried out for a total of 6 hours while maintaining the temperature in the system at 70 ° C. During the polymerization, the slurry liquid in the reaction vessel was continuously circulated through a circulating ultrasonic disperser, and the ultrasonic irradiation was continuously performed for 6 hours.
- Example 2 A resin-coated aluminum paste was obtained in the same manner as in Example 1 except that the ultrasonic output was changed to 400 W in Example 1.
- the non-volatile content of this paste according to JIS-K-5910 was 50.3% by weight.
- Example 3 A resin-coated aluminum paste was obtained in the same manner as in Example 1 except that the ultrasonic output was changed to 600 W in Example 1.
- the non-volatile content of this paste according to JIS-K-5910 was 50.0% by weight.
- Example 4 In place of the circulating ultrasonic disperser used in Example 1, an ultrasonic vibrator is attached directly to the outside of an external circulation type container, and ultrasonic waves are added to the internal slurry liquid through the wall of the external circulation type container.
- a circulating ultrasonic disperser was used. This circulating ultrasonic disperser has a container capable of holding about 1.5 l of slurry liquid at all times, and an ultrasonic vibrator is directly attached to the bottom surface of the container.
- the stirring time after addition of acrylic acid was changed from 30 minutes to 60 minutes, and ultrasonic waves having a frequency of 40 kHz and an output of 12 W were irradiated during polymerization, as in Example 1.
- the non-volatile content of this paste according to JIS-K-5910 was 50.1% by weight.
- a schematic diagram of the experimental apparatus used in this example is shown in FIG.
- Example 5 A resin-coated aluminum paste was obtained in the same manner as in Example 4 except that the ultrasonic output was changed to 90 W in Example 4.
- the non-volatile content of this paste according to JIS-K-5910 was 50.0% by weight.
- Example 6 A resin-coated aluminum paste was obtained in the same manner as in Example 4 except that the ultrasonic output was changed to 150 W in Example 4.
- the non-volatile content of this paste according to JIS-K-5910 was 50.1% by weight.
- Example 7 In place of the circulating ultrasonic disperser used in Example 1, an ultrasonic vibrator is directly attached to the outside of an external circulation type container, the inside of the container is filled with water, and the external circulation in which the slurry liquid circulates there. A circulating ultrasonic disperser of a type that indirectly applies ultrasonic waves to the slurry liquid by passing through the line was used.
- a schematic diagram of the experimental apparatus used in this example is shown in FIG.
- a resin-coated aluminum paste was obtained in the same manner as in Example 1 except that the stirring time after addition of acrylic acid was changed from 30 minutes to 60 minutes and that ultrasonic waves with a frequency of 42 kHz and an output of 180 W were irradiated during the polymerization.
- the non-volatile content of this paste according to JIS-K-5910 was 49.9% by weight.
- Example 8 A resin-coated aluminum paste was obtained in the same manner as in Example 7 except that the circulation rate of the slurry liquid was 0.25 l / min, and ultrasonic waves with a frequency of 42 kHz and an output of 180 W were applied.
- the non-volatile content of this paste according to JIS-K-5910 was 50.1% by weight.
- Example 1 A resin-coated aluminum paste was obtained in the same manner as in Example 1 except that no vibration external action was performed.
- the non-volatile content of the filtrate and the non-volatile content of the paste were 1.9 wt% and 50.0 wt%, respectively.
- Resin-coated metal pigment 0.25 g (Examples 1 to 8, Comparative Example 1, aluminum content), and thinner: 25 g (Mixed butyl acetate 30%, toluene 45%, isopropyl alcohol 20%, ethyl cellosolve 5%)
- (A) the ratio of the number of particle aggregate particles formed from two or more primary particles and the number (B) the number of non-aggregated primary particles, B / (A + B) is calculated. It was evaluated as follows. (The larger the value, the better.
- the resin-coated metal pigment of the present invention can be suitably used for metallic paints, printing inks, and plastic kneading applications, and is excellent in adhesion and chemical resistance when formed into a coating film, and has little deterioration in color tone. It is highly usable as a paint for automobiles and home appliances.
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Abstract
Description
(1)金属顔料100重量部に対して0.1~50重量部の樹脂が前記金属顔料の表面に付着している樹脂被覆金属顔料であって、反応槽での樹脂被覆処理中に、前記金属顔料を含むスラリー液の一部を外部循環型容器に循環させ、この外部循環型容器に対して超音波による振動処理を付加することにより得られる樹脂被覆金属顔料。
(2)金属顔料100重量部に対して0.1~50重量部の樹脂が前記金属顔料の表面に付着している樹脂被覆金属顔料であって、反応槽での樹脂被覆処理中に、前記金属顔料を含むスラリー液の一部を外部循環型容器に循環させ、該外部循環型容器の外側に直接超音波振動子を貼付し、外部の壁を通して内部のスラリー液に超音波を付加することにより得られる、上記(1)に記載の樹脂被覆金属顔料。
(3)樹脂被覆金属顔料の粒子の平均粒径と樹脂被覆前の金属顔料の粒子の平均粒径の差が0より大きく5μm以下である、樹脂被覆金属顔料。
(4)樹脂被覆金属顔料中の、2個以上の一次粒子で形成されている粒子凝集体の粒子数(A)と凝集していない一次粒子の粒子数(B)の割合、B/(A+B)が0.3~1である、樹脂被覆金属顔料。
(5)樹脂被覆金属顔料の表面に付着している樹脂被覆層の凹凸が、25nm以下である、樹脂被覆金属顔料。
(6)樹脂被覆金属顔料の平均表面粗さRaが20nm以下であり、かつ、表面粗さ曲線の凹凸の平均高さRcが80nm以下である、樹脂被覆金属顔料。
(7)樹脂被覆金属顔料を含む塗料をアクリル樹脂に塗布して得られる塗板を、2.5Nの水酸化ナトリウム溶液に20℃で24時間浸漬させた時の、浸漬部と未浸漬部との色差ΔEによって表される耐アルカリ性評価方法において、ΔE=1.0未満の耐アルカリ性を示す、樹脂被覆金属顔料。
(8)樹脂被覆金属顔料を含む水性塗料を40℃で8時間保温したときのガス発生量が、10ml以下である、樹脂被覆金属顔料。
(9)金属顔料100重量部に対して0.1~50重量部の樹脂が前記金属顔料の表面に付着している樹脂被覆金属顔料の製造方法であって、樹脂被覆処理中に超音波による振動を付加することを含む、樹脂被覆金属顔料の製造方法。
(10)金属顔料100重量部に対して0.1~50重量部の樹脂が前記金属顔料の表面に付着している樹脂被覆金属顔料の製造方法であって、反応槽での樹脂被覆処理中に、前記金属顔料を含むスラリー液の一部を外部循環型容器に循環させ、この外部循環型容器に対して超音波による振動処理を付加することを含む、樹脂被覆金属顔料の製造方法。
(11)金属顔料100重量部に対して0.1~50重量部の樹脂が前記金属顔料の表面に付着している樹脂被覆金属顔料の製造方法であって、反応槽での樹脂被覆処理中に、前記金属顔料を含むスラリー液の一部を外部循環型容器に循環させ、該外部循環型容器の外側に直接超音波振動子を貼付し、外部の壁を通して内部のスラリー液に超音波を付加することを含む、上記(10)に記載の製造方法。
(12)金属顔料がアルミニウム顔料である、上記(1)~(8)のいずれかに記載の樹脂被覆金属顔料。
(13)金属顔料がアルミニウム顔料である、上記(9)~(11)のいずれかに記載の製造方法。
なお、本発明において上記有機溶剤は、上記の分子内に一個以上の二重結合を有する単量体及び/又はオリゴマーを重合反応させて樹脂を形成する際の反応溶媒としても用いられる。
まず前処理として、樹脂被覆金属顔料を過剰のメタノール及びクロロホルムで超音波洗浄をして、その後、真空乾燥し、再度アセトンに分散・洗浄後、自然乾燥を行う。そして後エポキシ樹脂で包埋し、完全硬化させた後、トリミングと切片切り出しを行い、その断面を透過型電子顕微鏡(以下TEMと略記する)で観察し、樹脂被覆層の表面の凹部と凸部の高さの差を測定する。
金属顔料の表面形態観察法として、原子間力顕微鏡(以下AFMと略記する)TMX-2010(Topometrix製)を使用する。前処理として、試料の樹脂被覆金属顔料を過剰のメタノール及びクロロホルムで超音波洗浄後、真空乾燥し、再度アセトンに分散後、Siウェハー上に滴下し、自然乾燥を行う。AFMによる表面粗さの定量は、樹脂被覆金属顔料が他の樹脂被覆金属顔料と重なりがないものについて、5μm四方の視野につき表面粗さ曲線(表面凹凸のラインプロファイル)を300スキャンにより測定し、粗さ曲線の算術平均粗さ(基準長さ5μm内での標高の絶対値の算術平均)を求める。基準長さは、平均粒径d50によるが、5μmを基準とする。本願では、算術平均粗さを3視野以上測定し、更に算術平均した値を「平均表面粗さRa(nm)」として定義する。表面粗さの用語については、JIS-B-0660:1998に基づく。
20L反応槽に、
市販のアルミペースト 1500g
(旭化成ケミカルズ株式会社製、GX-5060「平均粒径6μm、不揮発分72%」)、及び
ミネラルスピリット 8300g
を反応槽に投入した。そして、窒素ガスを導入しながら攪拌し、系内の温度を70℃に昇温した。次いで、アクリル酸4.3gを添加し、30分間攪拌を続けた。
その後、市販の循環式超音波分散機に接続し、定量ポンプにより反応槽内のスラリー液を約1l/minの速度で循環させた。この循環式超音波分散機は、その容器内のスラリー液に、超音波ホーンを介して直接超音波を照射する型である。実施例1で用いた実験装置の概略図を図1に示す。容器内には常時100mlのスラリー液が保持されており、容器内に循環させたスラリー液に、直接、周波数20kHz、出力200Wの超音波を60分間照射した。
次いで、
トリメチロールプロパントリメタクリレート 110.2g
ジ-トリメチロールプロパンテトラアクリレート 48.6g
2,2′-アゾビス-2,4-ジメチルバレロニトリル 29.2g
、及び
ミネラルスピリット 1200g
からなる溶液を作製した。そして、定量ポンプにより約7.9g/min.の速度で反応槽にこの溶液を添加し、系内の温度を70℃に保ちながら合計6時間重合した。なお、重合中、反応槽内のスラリー液を循環式超音波分散機に継続循環し、上記超音波照射は6時間連続実施した。重合終了後にサンプリングしたろ液中のトリメチロールプロパントリメタクリレートの未反応量をガスクロマトグラフィで分析したところ、添加量の99%以上が反応していた。重合終了後、自然冷却し、スラリーを濾過し、樹脂被覆アルミペーストを得た。JIS-K-5910によるこのペーストの不揮発分は50.1重量%であった。
実施例1で、超音波出力を400Wに変更した以外は実施例1と同様にして樹脂被覆アルミペーストを得た。JIS-K-5910によるこのペーストの不揮発分は50.3重量%であった。
実施例1で、超音波出力を600Wに変更した以外は実施例1と同様にして樹脂被覆アルミペーストを得た。JIS-K-5910によるこのペーストの不揮発分は50.0重量%であった。
実施例1で用いた循環式超音波分散機の代わりに、外部循環型容器の外側に直接超音波振動子を貼付し、外部循環型容器の壁を通して内部のスラリー液に超音波を付加する型の循環式超音波分散機を用いた。この循環式超音波分散機には常時約1.5lのスラリー液の保持が可能な容器があり、この容器の底面に直接超音波振動子が貼付されている。この循環式超音波分散機を用い、アクリル酸添加後の攪拌時間を30分間から60分間にしたこと、及び重合中において周波数40kHz、出力12Wの超音波を照射したこと以外は実施例1と同様にして樹脂被覆アルミペーストを得た。JIS-K-5910によるこのペーストの不揮発分は50.1重量%であった。本実施例で用いた実験装置の概略図を図2に示す。
実施例4で、超音波出力を90Wに変更した以外は実施例4と同様にして樹脂被覆アルミペーストを得た。JIS-K-5910によるこのペーストの不揮発分は50.0重量%であった。
実施例4で、超音波出力を150Wに変更した以外は実施例4と同様にして樹脂被覆アルミペーストを得た。JIS-K-5910によるこのペーストの不揮発分は50.1重量%であった。
実施例1で用いた循環式超音波分散機の代わりに、外部循環型容器の外側に直接超音波振動子を貼付し、容器内部を水で満たし、そこをスラリー液が循環している外部循環ラインを通すことで、スラリー液に超音波を間接的に付加する型の循環式超音波分散機を用いた。本実施例で用いた実験装置の概略図を図3に示す。アクリル酸添加後の攪拌時間を30分間から60分間にしたこと、及び重合中において周波数42kHz、出力180Wの超音波を照射した以外は実施例1と同様にして樹脂被覆アルミペーストを得た。JIS-K-5910によるこのペーストの不揮発分は49.9重量%であった。
スラリー液の循環速度を0.25l/minにし、周波数42kHz、出力180Wの超音波を照射した以外は実施例7と同様にして樹脂被覆アルミペーストを得た。JIS-K-5910によるこのペーストの不揮発分は50.1重量%であった。
振動的外的作用を一切行わない以外は実施例1と同様にして樹脂被覆アルミペーストを得た。この濾過液の不揮発分及びペーストの不揮発分は、それぞれ1.9重量%と50.0重量%であった。
(株)島津製作所製;SALD-2200(レーザー回折粒度分布測定装置)を用いて、実施例1から8、及び比較例1で得られた樹脂被覆金属顔料の平均粒径を測定し、樹脂被覆前の金属顔料との平均粒径差を算出した。
実施例1から8、及び比較例1で得られた樹脂被覆金属顔料を、下記の組成でマイクロスパチュラを用いて手動により、シンナーに分散させた。目視で分散液に金属顔料の塊がないことを確認した後、先端毛細管付ピペットを用いて一滴の分散液をマイクログラスカバーの上に滴下し、60℃のオーブンで30分乾燥し、光学顕微鏡を用いて金属顔料の分散状態を観察し、粒子数を数えることで評価した。本評価では、株式会社ハイロックス製;デジタルマイクロスコープ KH-7700を用いて3500倍の倍率で観察した。
樹脂被覆金属顔料: 0.25g
(実施例1から8、比較例1、アルミニウム分として)、及び
シンナー: 25g
(酢酸ブチル30%、トルエン45%、イソプロピルアルコール20%、エチルセロソルブ5%を混合したもの)
観察結果に応じて(A)2個以上の一次粒子から形成されている粒子凝集体粒子数と(B)凝集していない一次粒子数との割合、B/(A+B)を算出し、下記のように評価した。(数値が大きいほど良好。実用上0.3以上が好ましい。)
◎(優):0.9以上
○(良):0.6以上~0.9未満
△(可):0.3以上~0.6未満
×(不可):0.3未満
実施例1から8、及び比較例1で得られた樹脂被覆金属顔料を使用して、下記の組成でメタリック塗料を作製した。
樹脂被覆金属顔料: 5g
(実施例1から8、比較例1、アルミニウム分として)
シンナー: 50g
(武蔵塗料株式会社製、商品名「プラエースシンナー No.2726」)、及び
アクリル樹脂: 33g
(武蔵塗料株式会社製、商品名「プラエース No.7160」)
エアスプレー装置を用いて上記塗料をABS樹脂板に乾燥膜厚が20μmになるように塗装し、60℃のオーブンで30分乾燥し、評価用塗板を得た。
上記の評価用塗板を用いて、密着性、耐薬品性、光沢保持率の評価を行った。
上記で作製した塗板を用い、セロテープ(登録商標:ニチバン(株)製、CT405AP-18)を塗膜に密着させ、45度の角度で引っ張り、金属顔料粒子の剥離度合いを目視で観察した。観察結果に応じて、下記のように評価した。
○(良):剥離なし
△(可):やや剥離あり
×(不可):剥離あり
上記で作製した塗板の下半分を2.5NのNaOH水溶液を入れたビーカーに浸漬し、23℃で24時間放置した。試験後の塗板を水洗、乾燥したのち、浸漬部と未浸漬部を、JIS-Z-8722(1982)の条件d(8-d法)により測色し、JIS-Z-8730(1980)の6.3.2により色差ΔEを求める。色差ΔEの値に応じて、下記のように評価した。(値が小さいほど良好。)
○(良):1.0未満
△(可):1.0以上~2.0未満
×(不可):2.0以上
光沢計(スガ試験機(株)製、デジタル変角光沢計UGV-5D)を用いて60度光沢(入射角、反射角とも60度)を測定する。上記で作製した塗板の60度光沢の測定値をG’、樹脂を被覆していないアルミニウム粉末を用いて同様に作製した塗板の60度光沢の測定値をGとし、光沢保持率Rを下式によって求める。
R=(G’/G)×100
光沢保持率Rの値に応じて、下記のように評価した。(数値が大きいほど良好。実用上70以上が好ましい。)
◎(優):90以上
○(良):90未満~80以上
△(可):80未満~70以上
×(不可):70未満
実施例1から8、及び比較例1で得られた樹脂被覆金属顔料を使用して、下記の組成で特定の水性塗料を作製した。
樹脂被覆金属顔料: 5g
(実施例1から8、比較例1、アルミニウム分として)
ブチルセロソルブ: 40g
水: 50g、及び
アクリルエマルジョン: 110g
(DSM製、商品名「NeoCryl A-2091」)
この水性塗料200gを200mlの三角フラスコにを入れ、ゴム栓付きメスピペットを取り付け、40℃で8時間放置後のガス発生量を測定した。
(1)表面の凹凸の測定
まず前処理として、樹脂被覆金属顔料を過剰のメタノール及びクロロホルムで超音波洗浄をして、その後、真空乾燥し、再度アセトンに分散・洗浄後、自然乾燥を行った。そしてエポキシ樹脂で包埋し、完全硬化させた後、トリミングと切片切り出しを行い、その断面の透過型電子顕微鏡(以下TEMと略記する)で、観察を行い、樹脂被覆層の表面の凹凸を観察した。1視野1μm幅の観察を5視野行い、凹部と凸部の高さの最大値(凹凸の最大値)を測定する。
(2)平均表面粗さ:Ra
原子間力顕微鏡(AFM)を用いて樹脂被覆金属顔料の1視野5μm四方のラインプロファイル(300スキャン)を求めた。これより算術平均表面粗さを求めた。同様の操作を合計3視野以上について行い、それらの算術平均値を求めてRaとした。
(3)表面粗さ曲線の凹凸の平均高さ:Rc
前記(2)で求めたものと同じラインプロファイルにより、表面粗さ曲線の凹凸の平均高さを求めた。同様の操作を合計3視野以上について行い、それらの算術平均を求めてRcとした。
Claims (13)
- 金属顔料100重量部に対して0.1~50重量部の樹脂が前記金属顔料の表面に付着している樹脂被覆金属顔料であって、反応槽での樹脂被覆処理中に、前記金属顔料を含むスラリー液の一部を外部循環型容器に循環させ、この外部循環型容器に対して超音波による振動処理を付加することにより得られる樹脂被覆金属顔料。
- 金属顔料100重量部に対して0.1~50重量部の樹脂が前記金属顔料の表面に付着している樹脂被覆金属顔料であって、反応槽での樹脂被覆処理中に、前記金属顔料を含むスラリー液の一部を外部循環型容器に循環させ、該外部循環型容器の外側に直接超音波振動子を貼付し、外部の壁を通して内部のスラリー液に超音波を付加することにより得られる、請求項1に記載の樹脂被覆金属顔料。
- 樹脂被覆金属顔料の粒子の平均粒径と樹脂被覆前の金属顔料の粒子の平均粒径の差が0より大きく5μm以下である、樹脂被覆金属顔料。
- 樹脂被覆金属顔料中の、2個以上の一次粒子で形成されている粒子凝集体の粒子数(A)と凝集していない一次粒子の粒子数(B)の割合、B/(A+B)が0.3~1である、樹脂被覆金属顔料。
- 樹脂被覆金属顔料の表面に付着している樹脂被覆層の凹凸が、25nm以下である、樹脂被覆金属顔料。
- 樹脂被覆金属顔料の平均表面粗さRaが20nm以下であり、かつ、表面粗さ曲線の凹凸の平均高さRcが80nm以下である、樹脂被覆金属顔料。
- 樹脂被覆金属顔料を含む塗料をアクリル樹脂に塗布して得られる塗板を、2.5Nの水酸化ナトリウム溶液に20℃で24時間浸漬させた時の、浸漬部と未浸漬部との色差ΔEによって表される耐アルカリ性評価方法において、ΔE=1.0未満の耐アルカリ性を示す、樹脂被覆金属顔料。
- 樹脂被覆金属顔料を含む水性塗料を40℃で8時間保温したときのガス発生量が、10ml以下である、樹脂被覆金属顔料。
- 金属顔料100重量部に対して0.1~50重量部の樹脂が前記金属顔料の表面に付着している樹脂被覆金属顔料の製造方法であって、樹脂被覆処理中に超音波による振動を付加することを含む、樹脂被覆金属顔料の製造方法。
- 金属顔料100重量部に対して0.1~50重量部の樹脂が前記金属顔料の表面に付着している樹脂被覆金属顔料の製造方法であって、反応槽での樹脂被覆処理中に、前記金属顔料を含むスラリー液の一部を外部循環型容器に循環させ、この外部循環型容器に対して超音波による振動処理を付加することを含む、樹脂被覆金属顔料の製造方法。
- 金属顔料100重量部に対して0.1~50重量部の樹脂が前記金属顔料の表面に付着している樹脂被覆金属顔料の製造方法であって、反応槽での樹脂被覆処理中に、前記金属顔料を含むスラリー液の一部を外部循環型容器に循環させ、該外部循環型容器の外側に直接超音波振動子を貼付し、外部の壁を通して内部のスラリー液に超音波を付加することを含む、請求項10に記載の製造方法。
- 金属顔料がアルミニウム顔料である、請求項1~8のいずれか一項に記載の樹脂被覆金属顔料。
- 金属顔料がアルミニウム顔料である、請求項9~11のいずれか一項に記載の製造方法。
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US13/394,241 US8900708B2 (en) | 2009-09-18 | 2009-09-18 | Resin-coated metal pigment, and process for producing same |
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PCT/JP2009/066392 WO2011033655A1 (ja) | 2009-09-18 | 2009-09-18 | 樹脂被覆金属顔料、およびその製造方法 |
EP09849514.6A EP2479224B1 (en) | 2009-09-18 | 2009-09-18 | Resin-coated metal pigment, and process for producing same |
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Also Published As
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KR20120035217A (ko) | 2012-04-13 |
SG178543A1 (en) | 2012-03-29 |
EP2479224A1 (en) | 2012-07-25 |
JPWO2011033655A1 (ja) | 2013-02-07 |
EP2479224A4 (en) | 2012-11-28 |
CN102575114B (zh) | 2014-08-13 |
CN102575114A (zh) | 2012-07-11 |
US20140079892A1 (en) | 2014-03-20 |
US20120165454A1 (en) | 2012-06-28 |
KR101831392B1 (ko) | 2018-02-22 |
JP5224561B2 (ja) | 2013-07-03 |
US8883255B2 (en) | 2014-11-11 |
KR20180019784A (ko) | 2018-02-26 |
EP2479224B1 (en) | 2017-02-22 |
US8900708B2 (en) | 2014-12-02 |
KR20150048898A (ko) | 2015-05-07 |
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