WO2012043564A1 - 水酸化マグネシウム微粒子及び酸化マグネシウム微粒子、並びにそれらの製造方法 - Google Patents
水酸化マグネシウム微粒子及び酸化マグネシウム微粒子、並びにそれらの製造方法 Download PDFInfo
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- WO2012043564A1 WO2012043564A1 PCT/JP2011/072083 JP2011072083W WO2012043564A1 WO 2012043564 A1 WO2012043564 A1 WO 2012043564A1 JP 2011072083 W JP2011072083 W JP 2011072083W WO 2012043564 A1 WO2012043564 A1 WO 2012043564A1
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- Prior art keywords
- magnesium hydroxide
- fine particles
- magnesium
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- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 title claims abstract description 150
- 239000000347 magnesium hydroxide Substances 0.000 title claims abstract description 150
- 229910001862 magnesium hydroxide Inorganic materials 0.000 title claims abstract description 150
- 239000011859 microparticle Substances 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000002245 particle Substances 0.000 claims abstract description 82
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 48
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 48
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 48
- 230000001186 cumulative effect Effects 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 239000010419 fine particle Substances 0.000 claims description 93
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 87
- 239000007864 aqueous solution Substances 0.000 claims description 51
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 43
- 239000002002 slurry Substances 0.000 claims description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 21
- 238000005406 washing Methods 0.000 claims description 19
- 239000000243 solution Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 239000000460 chlorine Substances 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 8
- 239000012298 atmosphere Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 229910052801 chlorine Inorganic materials 0.000 claims description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 4
- 239000000706 filtrate Substances 0.000 claims description 3
- 239000000701 coagulant Substances 0.000 claims description 2
- 239000002244 precipitate Substances 0.000 claims description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 42
- 229960002337 magnesium chloride Drugs 0.000 description 37
- 239000002994 raw material Substances 0.000 description 20
- 238000010335 hydrothermal treatment Methods 0.000 description 18
- 239000011347 resin Substances 0.000 description 17
- 229920005989 resin Polymers 0.000 description 17
- 239000000463 material Substances 0.000 description 16
- 239000000654 additive Substances 0.000 description 13
- 239000000945 filler Substances 0.000 description 13
- 239000012535 impurity Substances 0.000 description 13
- 239000003054 catalyst Substances 0.000 description 12
- 239000008204 material by function Substances 0.000 description 11
- 239000003795 chemical substances by application Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000002253 acid Substances 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000010828 elution Methods 0.000 description 5
- 239000011819 refractory material Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 4
- 229910000976 Electrical steel Inorganic materials 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 229910052793 cadmium Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 229910052733 gallium Inorganic materials 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052738 indium Inorganic materials 0.000 description 3
- 229910052745 lead Inorganic materials 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 239000003607 modifier Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 229940047670 sodium acrylate Drugs 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 229910052716 thallium Inorganic materials 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 229910052726 zirconium Inorganic materials 0.000 description 3
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000003456 ion exchange resin Substances 0.000 description 2
- 229920003303 ion-exchange polymer Polymers 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229920006322 acrylamide copolymer Polymers 0.000 description 1
- 229940048053 acrylate Drugs 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- -1 alkylamino methacrylate quaternary ammonium salt Chemical class 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 description 1
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 description 1
- 229940091250 magnesium supplement Drugs 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
- C01F5/06—Magnesia by thermal decomposition of magnesium compounds
- C01F5/08—Magnesia by thermal decomposition of magnesium compounds by calcining magnesium hydroxide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
- C01F5/22—Magnesium hydroxide from magnesium compounds with alkali hydroxides or alkaline- earth oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
- C01P2004/52—Particles with a specific particle size distribution highly monodisperse size distribution
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
Definitions
- the present invention relates to a high-purity magnesium hydroxide fine particle and a high-purity magnesium oxide fine particle having a small particle diameter and uniform, and methods for producing them.
- Magnesium hydroxide and magnesium oxide are inorganic materials used in various fields. Examples of the former use include additives, resin fillers, high-functional materials, and catalysts, and the latter use includes Examples include refractories, additives, resin fillers, highly functional materials, magnetic steel sheet materials, and catalysts. Including these applications, magnesium hydroxide and magnesium oxide are often required to have high purity, small particle size, and uniform fine particle form.
- An object of the present invention is to solve the above-mentioned problems, and to provide high-purity magnesium hydroxide fine particles and high-purity magnesium oxide fine particles having a small particle diameter and uniform, and methods for producing them.
- the present invention has a BET specific surface area of 5 m 2 / g or more, a volume-based cumulative 50% particle size (D 50 ) of 0.1 to 0.5 ⁇ m by laser diffraction scattering particle size distribution measurement, and laser diffraction scattering particle size distribution measurement.
- the ratio D 90 / D 10 of the volume-based cumulative 10% particle size (D 10 ) to the volume-based cumulative 90% particle size (D 90 ) by 10 is 10 or less, and the purity is 99.5% by mass or more. It relates to magnesium fine particles.
- the present invention has a BET specific surface area of 5 m 2 / g or more, a volume-based cumulative 50% particle diameter (D 50 ) of 0.1 to 0.5 ⁇ m by laser diffraction scattering particle size distribution measurement, and a laser diffraction scattering particle size.
- the ratio D 90 / D 10 of the volume-based cumulative 10% particle diameter (D 10 ) and the volume-based cumulative 90% particle diameter (D 90 ) by distribution measurement is 10 or less, and the purity is 99.5% by mass or more. It relates to magnesium oxide fine particles.
- the present invention provides Preparing a magnesium chloride aqueous solution (A); A step (B) of obtaining a magnesium hydroxide slurry by reacting an aqueous magnesium chloride solution with an alkaline aqueous solution of 1 to 18 N at a reaction rate of 101 to 210 mol%; A step (C) of obtaining a hydrothermally treated magnesium hydroxide slurry by holding the magnesium hydroxide slurry at a temperature of 101 to 200 ° C. while stirring; and filtering, washing and washing the hydrothermally treated magnesium hydroxide slurry; Step of drying to obtain magnesium hydroxide fine particles (D) The manufacturing method of the magnesium hydroxide microparticles
- the present invention provides the production of magnesium oxide fine particles, comprising the step (E) of calcining the magnesium hydroxide fine particles or the magnesium hydroxide fine particles obtained by the production method in an air atmosphere at 500 to 1500 ° C. Regarding the method.
- the magnesium hydroxide fine particles and the magnesium oxide fine particles of the present invention are highly pure, have a small particle size and are uniform, and are highly useful in various fields.
- the fine particles as described above can be easily prepared, which is highly convenient.
- the magnesium hydroxide fine particles of the present invention have a BET specific surface area of 5 m 2 / g or more and a volume-based cumulative 50% particle diameter (D 50 ) measured by laser diffraction scattering type particle size distribution is 0.1 to 0.5 ⁇ m.
- the ratio D 90 / D 10 of the volume-based cumulative 10% particle diameter (D 10 ) and the volume-based cumulative 90% particle diameter (D 90 ) by laser diffraction scattering type particle size distribution measurement is 10 or less. Since such magnesium hydroxide fine particles have a small particle shape and excellent reactivity, they are suitable for additives, resin fillers, catalysts, and the like, and also have a small particle shape, little variation in particle size, and excellent dispersibility.
- the BET specific surface area of the magnesium hydroxide fine particles of the present invention is preferably 10 m 2 / g or more, D 50 is preferably 0.2 to 0.5 ⁇ m, and D 90 / D 10 is preferably 5 or less.
- the purity of the magnesium hydroxide fine particles of the present invention is 99.5% by mass or more. If it is this range, the elution of an impurity will be suppressed extremely and it can use it suitably for a highly functional material.
- the purity of the magnesium hydroxide fine particles of the present invention is preferably 99.9% by mass or more.
- the purity refers to the impurity element (Ag, Al, B, Ba, Bi, Cd, Cl, Co, Cr, Cu, Fe, Ga, In, K, Li, Mn, Mo, Na in the target fine particles. , Ni, P, Pb, S, Si, Sr, Tl, V, Zn, Ti, and Zr) are measured, and the total content is subtracted from 100% by mass.
- high purity means that the purity calculated as described above is 99.5% by mass or more.
- Impurity elements to be measured (Ag, Al, B, Ba, Bi, Cd, Co, Cr, Cu, Fe, Ga, In, K, Li, Mn, Mo, Na, Ni, P, Pb, S, Si , Sr, Tl, V, Zn, Ti, and Zr), using an ICP emission spectrometer, the sample was dissolved in acid, then the mass was measured, and the Cl amount was measured using a spectrophotometer. Is dissolved in an acid, and the mass is taken as a measured value.
- the magnesium hydroxide fine particles of the present invention preferably have a total content of Fe, Ti, Ni, Cr, Mo and Mn of 500 mass ppm or less.
- the total content of these is 500 mass ppm or less, elution of metal impurities is extremely suppressed, and it can be suitably used for additives, resin fillers, and highly functional materials.
- the total content is more preferably 450 ppm by mass or less.
- the magnesium hydroxide fine particles of the present invention preferably have a chlorine content of 500 mass ppm or less.
- the content is 500 mass ppm or less, particle growth is extremely suppressed when obtaining magnesium oxide fine particles by firing, and a fine magnesium oxide powder can be obtained.
- the content is more preferably 450 ppm by mass or less.
- the ratio Dv / Dn between the volume-based average particle diameter (Dv) and the number-based average particle diameter (Dn) is preferably 1 to 10.
- Dv / Dn is 1 to 10
- the ink fixability when used for an ink fixing agent, heat resistance when added to a resin, etc., flame retardancy, flexibility function, and catalyst function are excellent, and Improves acid resistance and moisture resistance.
- Dv / Dn is more preferably 1-8.
- the magnesium oxide fine particles of the present invention have a BET specific surface area of 5 m 2 / g or more, and a volume-based cumulative 50% particle diameter (D 50 ) measured by laser diffraction scattering type particle size distribution is 0.1 to 0.5 ⁇ m.
- the ratio D 90 / D 10 between the volume-based cumulative 10% particle diameter (D 10 ) and the volume-based cumulative 90% particle diameter (D 90 ) measured by laser diffraction / scattering particle size distribution measurement is 10 or less. Since such magnesium oxide fine particles have a small particle shape and excellent reactivity, they are suitable for refractories, additives, resin fillers, electrical steel sheet materials, catalysts, and the like. Also, the particle shape is small and there is little variation in particle size.
- the BET specific surface area of the magnesium oxide fine particles of the present invention is preferably 20 m 2 / g or more, more preferably 40 m 2 / g or more, D 50 is preferably 0.2 to 0.4 ⁇ m, and D 90 / D 10 Is preferably 5 or less.
- the purity of the magnesium oxide fine particles of the present invention is 99.5% by mass or more. If it is this range, the elution of an impurity will be suppressed extremely and it can use it suitably for a highly functional material.
- the purity of the magnesium oxide fine particles of the present invention is preferably 99.9% by mass or more.
- the magnesium oxide fine particles of the present invention preferably have a total content of Fe, Ti, Ni, Cr, Mo and Mn of 500 mass ppm or less.
- the total content is more preferably 450 mass ppm or less.
- the magnesium oxide fine particles of the present invention preferably have a chlorine content of 500 mass ppm or less.
- a chlorine content 500 mass ppm or less.
- the content is more preferably 450 ppm by mass or less.
- the ratio Dv / Dn between the volume-based average particle diameter (Dv) and the number-based average particle diameter (Dn) is preferably 1 to 10.
- this Dv / Dn is 1 to 10
- ink fixability when used for an ink fixing agent, heat resistance when added to a resin, flame retardancy, flexibility function, light diffusion effect, and catalyst The effect is excellent, and the acid resistance and moisture resistance are improved, more preferably 1 to 8.
- the magnesium oxide fine particles of the present invention preferably have a citric acid activity (final reaction rate 40%, 20.0 ° C.) of 20 to 2000 seconds.
- a citric acid activity final reaction rate 40%, 20.0 ° C.
- the citric acid activity is preferably 20 to 500 seconds.
- the magnesium hydroxide fine particles of the present invention are Preparing a magnesium chloride aqueous solution (A); A step (B) of obtaining a magnesium hydroxide slurry by reacting an aqueous magnesium chloride solution with an alkaline aqueous solution of 1 to 18 N at a reaction rate of 101 to 210 mol%; A step (C) of obtaining a hydrothermally treated magnesium hydroxide slurry by holding the magnesium hydroxide slurry at a temperature of 101 to 200 ° C. while stirring; and filtering, washing and washing the hydrothermally treated magnesium hydroxide slurry; Step of drying to obtain magnesium hydroxide fine particles (D) Can be obtained by a method comprising
- Step (A) is a step of preparing an aqueous magnesium chloride solution.
- the concentration of the magnesium chloride aqueous solution is preferably 0.1 to 10 mol / L. When the concentration is less than 0.1 mol / L, the production efficiency is deteriorated. On the other hand, when the concentration is higher than 10 mol / L, the viscosity of the magnesium hydroxide slurry increases and handling becomes worse.
- the concentration of the magnesium chloride aqueous solution is preferably 0.5 to 5 mol / L.
- Step (A) is, for example, Preparing a crude magnesium chloride aqueous solution (A-1); Reacting a crude magnesium chloride aqueous solution with a 1-18N alkaline aqueous solution at a reaction rate of 1-30 mol% to obtain a crude magnesium hydroxide slurry (A-2); and a coagulant in the crude magnesium hydroxide slurry.
- the magnesium hydroxide is filtered to obtain a magnesium chloride solution as a filtrate, or a flocculant is added to agglomerate and precipitate the magnesium hydroxide to obtain a magnesium chloride aqueous solution as a supernatant (A-3 ) Can be included.
- Step (A-1) is a step of preparing a crude magnesium chloride solution.
- magnesium chloride magnesium chloride hexahydrate or anhydrous magnesium chloride, seawater, brine, or bitter juice can be used as magnesium chloride
- pure water through an ion exchange resin having an electric conductivity of 0.
- the crude magnesium chloride aqueous solution can have a concentration of 0.5 to 10 mol / L, preferably 1 to 5 mol / L, and more preferably 2 to 4 mol / L.
- Step (A-2) is a step of obtaining a crude magnesium hydroxide slurry by reacting an alkaline aqueous solution of 1 to 18N with a crude magnesium chloride aqueous solution such that the reaction rate is 1 to 30 mol%.
- the reaction rate is a value calculated assuming that the amount of alkali necessary for all magnesium chloride to become magnesium hydroxide is 100 mol%. For example, 200 mol% means twice the amount of alkali in terms of equivalent.
- an aqueous sodium hydroxide solution can be used, and the concentration can be 1 to 18 mol / L, preferably 5 to 18 mol / L, more preferably 10 to 18 mol / L.
- step (A-3) after adding a flocculant to the crude magnesium hydroxide slurry, the magnesium hydroxide is filtered to obtain a magnesium chloride solution as a filtrate, or the flocculant is added and the magnesium hydroxide is added. This is a step of coagulating and precipitating to obtain an aqueous magnesium chloride solution as the supernatant.
- acrylamide / sodium acrylate copolymer As the flocculant, acrylamide / sodium acrylate copolymer, acrylamide / sodium acrylamide-2-methylpropanesulfonate copolymer, polyacrylamide, alkylamino methacrylate quaternary ammonium salt polymer, alkylamino acrylate quaternary ammonium
- a flocculant mainly composed of a salt / acrylamide copolymer, polyamidine hydrochloride or the like can be appropriately selected and used, and an acrylamide / sodium acrylate copolymer is preferred.
- the amount of the flocculant added can be 100 to 1000 ppm by mass with respect to the amount of dry magnesium hydroxide in the crude magnesium hydroxide slurry.
- the concentration of the magnesium chloride aqueous solution thus obtained can be adjusted to obtain a magnesium chloride aqueous solution having a concentration of 0.1 to 10.0 mol / L.
- Step (B) is a step of obtaining a magnesium hydroxide slurry by reacting a magnesium chloride aqueous solution with a 1-18N alkaline aqueous solution at a reaction rate of 101-210 mol%.
- the reaction rate is less than 101 mol%, crystals grow too much during the hydrothermal treatment of the magnesium hydroxide slurry, and the particle size becomes too large.
- the reaction rate is higher than 210 mol%, the specific elements (Fe, Ti, Ni, Cr, Mo, and Mn) are eluted from the autoclave container and impurities are easily mixed.
- the reaction rate is preferably 103 to 200 mol%, more preferably 105 to 180%.
- the alkaline aqueous solution is preferably a sodium hydroxide aqueous solution having a concentration of 1 to 18 mol / L.
- concentration of the sodium hydroxide aqueous solution is less than 1 mol / L, the production efficiency is deteriorated.
- concentration becomes higher than 18 mol / L, the viscosity of a magnesium hydroxide slurry will become high and handling will worsen.
- concentration of the aqueous sodium hydroxide is preferably 4 to 16 mol / L.
- Step (C) is a step of obtaining a magnesium hydroxide slurry hydrothermally treated by holding the magnesium hydroxide slurry at a temperature of 101 to 200 ° C. while stirring.
- the hydrothermal treatment can be performed by holding the magnesium hydroxide slurry at 101 ° C. to 200 ° C. with stirring, for example, using an autoclave.
- the hydrothermal treatment temperature is lower than 101 ° C., crystals do not grow, and aggregated particles are generated, resulting in poor dispersion.
- the hydrothermal treatment temperature is higher than 200 ° C., crystals grow too much and the particle size tends to be too large.
- the hydrothermal treatment temperature is preferably 105 ° C to 150 ° C.
- the hydrothermal treatment time can be 0.5 to 3 hours. When the hydrothermal treatment time is within this range, the crystal growth and the particle diameter can be controlled within appropriate ranges.
- the hydrothermal treatment time is preferably 1 to 2 hours.
- the concentration of the magnesium hydroxide slurry subjected to hydrothermal treatment is adjusted to 30 g / L to 150 g / L by adding pure water. Also good.
- Step (D) is a step of obtaining magnesium hydroxide fine particles by filtering, washing and drying the hydrothermal magnesium hydroxide slurry.
- Step (D) is, for example, The hydrothermally treated magnesium hydroxide slurry is filtered and washed with water to obtain a first magnesium hydroxide cake (D-1); A process of adding 5 to 100 times pure water to the first magnesium hydroxide cake with respect to the dry magnesium hydroxide mass reference amount, stirring, filtering and washing with water to obtain a second magnesium hydroxide cake ( D-2); In place of the first magnesium hydroxide cake, the step (D-2) is repeated 1 to 20 times for the second magnesium hydroxide cake to obtain a high purity magnesium hydroxide cake (D-3); And drying the high purity magnesium hydroxide cake to obtain magnesium hydroxide fine particles (D-4); Can be included.
- D-1 The hydrothermally treated magnesium hydroxide slurry is filtered and washed with water to obtain a first magnesium hydroxide cake (D-1); A process of adding 5 to 100 times pure water to the first magnesium hydroxide cake with respect to the dry magnesium hydroxide mass reference amount, stirring, filtering and washing with water to obtain a second magnesium hydro
- Step (D-1) is a step of obtaining a first magnesium hydroxide cake by filtering and washing the hydrothermally treated magnesium hydroxide slurry. Washing with water can be carried out by adding 5 to 100 times, preferably 20 to 50 times, pure water after filtration after addition to dry magnesium hydroxide.
- step (D-2) pure water having a mass of 5 to 100 times the dry magnesium hydroxide mass reference amount is added to the first magnesium hydroxide cake, stirred, filtered, washed with water,
- 5 to 100 times pure water is added on a mass basis with respect to the dried magnesium hydroxide of the first magnesium hydroxide cake to obtain a second magnesium hydroxide slurry.
- the magnesium hydroxide slurry can be stirred and then filtered and washed with water to obtain a second magnesium hydroxide cake. Stirring can be performed, for example, at 10 to 50 ° C.
- the filtration can be performed using filter paper or the like, and the water washing can be performed by adding 5 to 100 times pure water on a mass basis with respect to dry magnesium hydroxide.
- step (D-3) instead of the first magnesium hydroxide cake, the repulp washing in the step (D-2) is performed once for the second magnesium hydroxide cake, and this is performed 1 to 20 times. This process is repeated to obtain a high purity magnesium hydroxide cake.
- Step (D-4) is a step of drying the high purity magnesium hydroxide cake to obtain magnesium hydroxide fine particles.
- magnesium hydroxide particles of the present invention can be obtained.
- the magnesium oxide fine particles of the present invention can be obtained by subjecting the magnesium hydroxide fine particles of the present invention to a step (E) of firing at 500 to 1200 ° C. in an air atmosphere.
- magnesium hydroxide fine particles are heated to 500 ° C. to 1200 ° C. in the air atmosphere at a heating rate of 1 to 20 ° C./min (preferably 3 to 10 ° C./min, more preferably 6 ° C./min).
- the magnesium oxide fine particles of the present invention can be obtained by heating to 600 to 800 ° C., and then firing the temperature at 500 to 1200 ° C., preferably 600 to 800 ° C. for 0.1 to 5 hours. it can.
- the high-purity magnesium hydroxide cake obtained in the step (D-3) may be dried and lightly loosened, and then subjected to the above baking treatment.
- magnesium hydroxide fine particles and magnesium oxide fine particles having high purity, small particle diameter, and uniformity can be easily prepared.
- the magnesium hydroxide fine particles and the magnesium oxide fine particles of the present invention are highly useful in various fields.
- an ink fixing agent for ink jet paper, etc. as a resin filler, a raw material for a separator heat-resistant layer for a secondary battery, a flame retardant, a film sheet modifier ( High performance materials such as heat resistance and flexibility), such as fuel cell ceramic raw material, phosphor raw material, superconducting thin film base material, tunnel magnetoresistive element (TMR element) tunnel barrier raw material, etc.
- the catalyst include wastewater treatment and exhaust gas treatment.
- fine-particles a highly functional material, a catalyst, etc.
- Magnesium oxide fine particles make use of their high activity, ceramic sintering aids as refractories, ink fixing agents for inkjet paper as additives, resin fillers for secondary batteries, etc.
- a high-functional material such as a separator heat-resistant layer raw material, a film sheet modifier (heat resistance and flexibility improvement), an LED sealing resin refractive index adjuster, a light diffusing agent, a fuel cell ceramic raw material, Phosphor raw material, raw material for superconducting thin film, tunnel barrier material for tunnel magnetoresistive element (TMR element), etc., as electromagnetic steel sheet material, raw material for insulating material for electromagnetic steel sheet, insulating coating material for dust core,
- the catalyst is suitable for wastewater treatment, exhaust gas treatment, and the like.
- the particle diameter, specific surface area, purity and activity of the obtained magnesium hydroxide fine particles and magnesium oxide fine particles were measured by the following methods.
- a laser diffraction scattering particle size distribution measurement laser diffraction scattering particle size distribution measuring apparatus (trade name: MT3300, manufactured by Nikkiso Co., Ltd.) was used, a cumulative 10% particle diameter on a volume basis (D 10), the cumulative volume-based The 50% particle size (D 50 ) and the volume-based cumulative 90% particle size (D 90 ) were measured.
- the volume-based average particle diameter (Dv) and the number-based average particle diameter (Dn) were also measured with the above-mentioned apparatus.
- Impurity elements to be measured (Ag, Al, B, Ba, Bi, Cd, Co, Cr, Cu, Fe, Ga, In, K, Li, Mn, Mo, Na, Ni, P, Pb, S, Si, Sr, Tl, V, Zn, Ti and Zr) using an ICP emission analyzer (trade name: SPS-5100, manufactured by Seiko Instruments Inc.) After dissolving the sample in acid, the mass was measured. The amount of Cl was measured by dissolving a sample in acid using a spectrophotometer (trade name: UV-2550, manufactured by Shimadzu Corporation) and measuring the mass.
- Example 1 A crude magnesium chloride aqueous solution having a purity of 90% by mass or more and a concentration of 3.5 mol / L was prepared. The concentration was adjusted by adding pure water (water purified by passing through an ion exchange resin to have an electric conductivity of 0.1 ⁇ S / cm or less) to this magnesium chloride aqueous solution, and a crude magnesium chloride aqueous solution having a concentration of 2.0 mol / L. It was.
- a sodium hydroxide aqueous solution with a concentration of 17.84 mol / L was added to the crude magnesium chloride aqueous solution with a concentration of 2.0 mol / L so as to achieve a reaction rate of 20 mol%.
- An acrylamide / sodium acrylate copolymer was added in an amount of 500 ppm by mass to the produced magnesium hydroxide, the magnesium hydroxide was coagulated and precipitated, and the supernatant was taken out to obtain an aqueous magnesium chloride solution.
- the concentration of the obtained magnesium chloride aqueous solution was adjusted to obtain a magnesium chloride aqueous solution having a concentration of 2.0 mol / L.
- This magnesium chloride aqueous solution was reacted with a sodium hydroxide aqueous solution having a concentration of 17.84 mol / L so that the reaction rate was 200 mol% to prepare a magnesium hydroxide slurry having a concentration of 100 g / L.
- the obtained magnesium hydroxide slurry was held with stirring at 150 ° C. for 1 hour using an autoclave, and subjected to hydrothermal treatment (heating and stirring treatment).
- the first magnesium hydroxide slurry subjected to hydrothermal treatment was filtered and washed with water to obtain a first magnesium hydroxide cake. Washing with water was performed by adding 40 times the pure water after mass filtration to the dried magnesium hydroxide.
- the obtained first magnesium hydroxide cake was subjected to repulp washing.
- the repulp washing first, 40 times pure water was added on a mass basis with respect to the dried magnesium hydroxide of the first magnesium hydroxide cake to obtain a second magnesium hydroxide slurry.
- the second magnesium hydroxide slurry is stirred at room temperature using a stirrer at a rotation speed of 500 rpm for 1 hour, and the second magnesium hydroxide slurry after the stirring is further filtered using filter paper.
- 20 times as much pure water was added after filtration and washed with water to obtain a second magnesium hydroxide cake.
- the above-described repulp washing was performed once, and the repulp washing was further repeated 10 times to obtain a high purity magnesium hydroxide cake.
- the high purity magnesium hydroxide cake was dried to obtain high purity magnesium hydroxide fine particles.
- Example 2 The reaction was performed in the same manner as in Example 1 except that the reaction rate in the reaction between the magnesium chloride aqueous solution and the sodium hydroxide aqueous solution was 120 mol% and the hydrothermal treatment time was 0.5 hour.
- Example 3 The same procedure as in Example 1 was performed except that the reaction rate in the reaction between the magnesium chloride aqueous solution and the sodium hydroxide aqueous solution was 105 mol% and the hydrothermal treatment time was 3 hours.
- Example 4 The same procedure as in Example 1 was carried out except that the hydrothermal treatment temperature was 130 ° C. and the aqueous sodium hydroxide solution was diluted to 8.92 mol / L with pure water.
- Example 5 The hydrothermal treatment temperature was set to 105 ° C., and the same procedure as in Example 1 was performed except that the magnesium hydroxide slurry subjected to the hydrothermal treatment was changed to 130 g / L.
- Example 6 The same operation as in Example 1 was carried out except that the aqueous sodium hydroxide solution was diluted to 4.96 mol / L with pure water.
- Example 7 The same operation as in Example 1 was conducted except that the magnesium hydroxide slurry subjected to hydrothermal treatment was diluted with pure water to 50 g / L.
- Example 4 It carried out similarly to Example 1 except having changed the sodium hydroxide aqueous solution into 21 mol / L with pure water.
- Example 8 The magnesium hydroxide fine particles prepared in Example 1 were baked at 1000 ° C. for 1 hour in an air atmosphere to obtain magnesium oxide fine particles.
- Example 9 The magnesium hydroxide fine particles prepared in Example 3 were baked at 600 ° C. for 1 hour in an air atmosphere to obtain magnesium oxide fine particles.
- Example 5 The magnesium hydroxide fine particles prepared in Example 1 were fired at 1400 ° C. for 1 hour in the air atmosphere to obtain magnesium oxide fine particles.
- Table 1 shows the measurement results for the magnesium hydroxide fine particles obtained in the above Examples and Comparative Examples, and Table 2 shows the measurement results for the magnesium oxide fine particles.
- the magnesium hydroxide fine particles and the magnesium oxide fine particles had a purity of 99.9% by mass or more, a small particle size and a uniform particle size.
- the magnesium hydroxide fine particles and the magnesium oxide fine particles of the present invention are highly useful in various fields because of their high purity, small particle size, uniformness, and good dispersibility (because the particle size distribution is sharp). .
- the fine particles as described above can be easily prepared, which is highly convenient.
- the use of magnesium hydroxide fine particles includes additives, resin fillers, highly functional materials, and catalysts.
- ink fixing agents for inkjet paper, etc . As additives, ink fixing agents for inkjet paper, etc .; as resin fillers, raw materials for separator heat-resistant layers for secondary batteries, flame retardants, film sheet modifiers (improved heat resistance and flexibility) High-functional materials include fuel cell ceramic raw materials, phosphor raw materials, raw materials for superconducting thin films, tunnel magnetoresistive elements (TMR elements) tunnel barrier raw materials, etc .; And can be used for applications such as exhaust gas treatment. Examples of the use of the magnesium oxide fine particles include refractories, additives, resin fillers, highly functional materials, electrical steel sheet materials, and catalysts.
- ceramic sintering aids, etc . as additives, ink fixing agents for inkjet paper, etc .; as resin fillers, raw materials for separator heat-resistant layers for secondary batteries, film sheet modifications Quality materials (improving heat resistance and flexibility), etc .; as high-functional materials, refractive index adjusting agent for LED sealing resin, light diffusing agent, raw material for ceramic for fuel cell, phosphor raw material, superconducting thin film base Raw materials, tunnel barrier raw materials for tunnel magnetoresistive elements (TMR elements), etc .; as magnetic steel sheet materials, raw materials for insulating materials for magnetic steel sheets, insulating coating materials for dust cores, etc .; as catalysts, wastewater treatment and exhaust gas treatment It can be used for such applications.
- TMR elements tunnel barrier raw materials for tunnel magnetoresistive elements
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Abstract
Description
塩化マグネシウム水溶液を用意する工程(A);
塩化マグネシウム水溶液を、1~18Nのアルカリ水溶液と、反応率101~210mol%で反応させて、水酸化マグネシウムスラリーを得る工程(B);
水酸化マグネシウムスラリーを、撹拌しながら、101~200℃の温度で保持して、水熱処理された水酸化マグネシウムスラリーを得る工程(C);並びに
水熱処理された水酸化マグネシウムスラリーを濾過、水洗及び乾燥させて、水酸化マグネシウム微粒子を得る工程(D)
を含む、水酸化マグネシウム微粒子の製造方法に関する。
測定対象となる不純物元素(Ag、Al、B、Ba、Bi、Cd、Co、Cr、Cu、Fe、Ga、In、K、Li、Mn、Mo、Na、Ni、P、Pb、S、Si、Sr、Tl、V、Zn、Ti及びZr)は、ICP発光分析装置を使用して、試料を酸に溶解した後、質量を測定し、Cl量は、分光光度計を使用して、試料を酸に溶解した後、質量を測定した値とする。
本発明の酸化マグネシウム微粒子のBET比表面積は好ましくは20m2/g以上、より好ましくは40m2/g以上であり、D50は好ましくは0.2~0.4μmであり、D90/D10は好ましくは5以下である。
塩化マグネシウム水溶液を用意する工程(A);
塩化マグネシウム水溶液を、1~18Nのアルカリ水溶液と、反応率101~210mol%で反応させて、水酸化マグネシウムスラリーを得る工程(B);
水酸化マグネシウムスラリーを、撹拌しながら、101~200℃の温度で保持して、水熱処理された水酸化マグネシウムスラリーを得る工程(C);並びに
水熱処理された水酸化マグネシウムスラリーを濾過、水洗及び乾燥させて、水酸化マグネシウム微粒子を得る工程(D)
を含む方法によって、得ることができる。
粗塩化マグネシウム水溶液を用意する工程(A-1);
粗塩化マグネシウム水溶液を、1~18Nのアルカリ水溶液と、反応率1~30mol%で反応させて、粗水酸化マグネシウムスラリーを得る工程(A-2);及び
粗水酸化マグネシウムスラリーに、凝集剤を添加した後、水酸化マグネシウムを濾過して、濾液として塩化マグネシウム溶液を得るか、又は凝集剤を添加し、水酸化マグネシウムを凝集沈殿させ、上澄液として塩化マグネシウム水溶液を得る工程(A-3)
を含むことができる。
水熱処理された水酸化マグネシウムスラリーを濾過、水洗して、第一の水酸化マグネシウムケーキを得る工程(D-1);
第一の水酸化マグネシウムケーキに、乾燥水酸化マグネシウム質量基準量に対して5~100倍の純水を加え、攪拌した後、濾過、水洗して、第二の水酸化マグネシウムケーキを得る工程(D-2);
第一の水酸化マグネシウムケーキの代わりに、第二の水酸化マグネシウムケーキに対して、工程(D-2)を1~20回繰り返し、高純度水酸化マグネシウムケーキを得る工程(D-3);及び
高純度水酸化マグネシウムケーキを乾燥させて、水酸化マグネシウム微粒子を得る工程(D-4);
を含むことができる。
レーザ回折散乱式粒度分布測定装置(商品名:MT3300、日機装社製)を使用して、体積基準の累積10%粒子径(D10)、体積基準の累積50%粒子径(D50)及び体積基準の累積90%粒子径(D90)を測定した。体積基準の平均粒子径(Dv)及び個数基準の平均粒子径(Dn)も同様に上記装置で測定した。
比表面積測定装置(商品名:Macsorb1210、マウンテック社製)を使用して、ガス吸着法のBET法により比表面積を測定した。
測定対象となる不純物元素(Ag、Al、B、Ba、Bi、Cd、Co、Cr、Cu、Fe、Ga、In、K、Li、Mn、Mo、Na、Ni、P、Pb、S、Si、Sr、Tl、V、Zn、Ti及びZr)は、ICP発光分析装置(商品名:SPS-5100、セイコーインスツルメンツ製)を使用して、試料を酸に溶解した後、質量を測定した。
Cl量は、分光光度計(商品名:UV-2550、島津製作所製)を使用して、試料を酸に溶解した後、質量を測定した。
水酸化マグネシウム及び酸化マグネシウム微粒子の純度は、100質量%から上記の「水酸化マグネシウム及び酸化マグネシウム不純物量測定法」で測定した不純物元素の質量の合計を差し引いた値として算出した。
0.4Nクエン酸水溶液100mlが酸化マグネシウムの中和量の40%に相当するように、酸化マグネシウム微粒子2.02gを秤量し、30.0℃で、当該クエン酸水溶液を攪拌している中に当該酸化マグネシウム微粒子を加え、クエン酸の全てが酸化マグネシウムと反応するまでの時間、すなわち、pH7を越えるまでの時間を測定した。
粗塩化マグネシウム水溶液として、純度90質量%以上、濃度3.5mol/Lのものを用意した。この塩化マグネシウム水溶液に純水(イオン交換樹脂に通して電気伝導率を0.1μS/cm以下まで精製した水)を添加することにより濃度を調整し、濃度2.0mol/Lの粗塩化マグネシウム水溶液とした。
塩化マグネシウム水溶液と水酸化ナトリウム水溶液との反応における反応率を120mol%とし、水熱処理時間を0.5時間とした以外は、実施例1と同様に行なった。
塩化マグネシウム水溶液と水酸化ナトリウム水溶液との反応における反応率を105mol%とし、水熱処理時間を3時間とした以外は、実施例1と同様に行なった。
水熱処理温度を130℃にし、水酸化ナトリウム水溶液を純水で8.92mol/Lに希釈した以外は、実施例1と同様に行った。
水熱処理温度を105℃にし、水熱処理に付す水酸化マグネシウムスラリーを、130g/Lとした以外は実施例1と同様に行なった。
水酸化ナトリウム水溶液を純水で4.96mol/Lに希釈した以外は実施例1と同様に行なった。
水熱処理に付す水酸化マグネシウムスラリーを純水で希釈し、50g/Lとした以外は実施例1と同様に行なった。
塩化マグネシウム水溶液と水酸化ナトリウム水溶液との反応における反応率を250mol%とした以外は、実施例1と同様に行なった。
塩化マグネシウム水溶液と水酸化ナトリウム水溶液との反応における反応率を90mol%とした以外は、実施例1と同様に行なった。
塩化マグネシウム水溶液と水酸化ナトリウム水溶液との反応における反応率を105mol%とし、水熱処理を行わなかった以外は、実施例1と同様に行なった。
水酸化ナトリウム水溶液を純水で21mol/Lにした以外は実施例1と同様に行なった。
実施例1で作成した水酸化マグネシウム微粒子を、大気雰囲気中で、1000℃で1時間焼成することにより、酸化マグネシウム微粒子を得た。
実施例3で作成した水酸化マグネシウム微粒子を、大気雰囲気中で、600℃で1時間焼成することにより、酸化マグネシウム微粒子を得た。
実施例1で作成した水酸化マグネシウム微粒子を、大気雰囲気中で、1400℃で1時間焼成することにより、酸化マグネシウム微粒子を得た。
具体的には、添加剤としては、インクジェット用紙のインク定着剤等;樹脂フィラーとしては、二次電池用のセパレータ耐熱層の原料、難燃剤、フィルムシートの改質剤(耐熱性、屈曲性向上)等;高機能性材料としては、燃料電池用セラミックの原料、蛍光体原料、超伝導薄膜下地用の原料、トンネル磁気抵抗素子(TMR素子)用のトンネル障壁原料等;触媒としては、排水処理、及び排ガス処理等の用途に用いることができる。
また、酸化マグネシウム微粒子の用途としては、耐火物、添加剤、樹脂フィラー、高機能性材料、電磁鋼板材料及び触媒等が挙げられる。
具体的には、耐火物としては、セラミック焼結助剤等;添加剤としては、インクジェット用紙のインク定着剤等;樹脂フィラーとしては、二次電池用のセパレータ耐熱層の原料、フィルムシートの改質剤(耐熱性、屈曲性向上)等;高機能性材料としては、LED封止樹脂の屈折率調整剤、光拡散剤、燃料電池用セラミックの原料、蛍光体原料、超伝導薄膜下地用の原料、トンネル磁気抵抗素子(TMR素子)用のトンネル障壁原料等;電磁鋼板材料としては、電磁鋼板用絶縁材の原料、圧粉鉄心用絶縁被膜材等;触媒としては、排水処理、及び排ガス処理等の用途に用いることができる。
Claims (15)
- BET比表面積が5m2/g以上、レーザ回折散乱式粒度分布測定による体積基準の累積50%粒子径(D50)が0.1~0.5μm、レーザ回折散乱式粒度分布測定による体積基準の累積10%粒子径(D10)と体積基準の累積90%粒子径(D90)との比D90/D10が10以下である、純度99.5質量%以上の水酸化マグネシウム微粒子。
- 純度が、99.9質量%以上である、請求項1記載の水酸化マグネシウム微粒子。
- Fe、Ti、Ni、Cr、Mo及びMnの合計含有量が500質量ppm以下である、請求項1又は2記載の水酸化マグネシウム微粒子。
- 塩素含有量が500質量ppm以下である、請求項1~3のいずれか1項記載の水酸化マグネシウム微粒子。
- 体積基準の平均粒子径(Dv)と個数基準の平均粒子径(Dn)との比Dv/Dnが1~10である、請求項1~4のいずれか1項記載の水酸化マグネシウム微粒子。
- BET比表面積が5m2/g以上、レーザ回折散乱式粒度分布測定による体積基準の累積50%粒子径(D50)が0.1~0.5μm、レーザ回折散乱式粒度分布測定による体積基準の累積10%粒子径(D10)と体積基準の累積90%粒子径(D90)との比D90/D10が10以下である、純度99.5質量%以上の酸化マグネシウム微粒子。
- 純度が、99.9質量%以上である、請求項6記載の酸化マグネシウム微粒子。
- Fe、Ti、Ni、Cr、Mo及びMnの合計含有量が500質量ppm以下である、請求項6又は7記載の酸化マグネシウム微粒子。
- 塩素含有量が、500質量ppm以下である、請求項6~8のいずれか1項記載の酸化マグネシウム微粒子。
- クエン酸活性度(40%)が、20~2000秒である、請求項6~9のいずれか1項記載の酸化マグネシウム微粒子。
- 体積基準の平均粒子径(Dv)と個数基準の平均粒子径(Dn)との比Dv/Dnが1~10である、請求項6~10のいずれか1項記載の酸化マグネシウム微粒子。
- 塩化マグネシウム水溶液を用意する工程(A)
塩化マグネシウム水溶液を、1~18Nのアルカリ水溶液と、反応率101~210mol%で反応させて、水酸化マグネシウムスラリーを得る工程(B);
水酸化マグネシウムスラリーを、撹拌しながら、101~200℃の温度で保持して、水熱処理された水酸化マグネシウムスラリーを得る工程(C);並びに
水熱処理された水酸化マグネシウムスラリーを濾過、水洗及び乾燥させて、水酸化マグネシウム微粒子を得る工程(D)
を含む、水酸化マグネシウム微粒子の製造方法。 - 工程(D)が、
水熱処理された水酸化マグネシウムスラリーを濾過、水洗して、第一の水酸化マグネシウムケーキを得る工程(D-1);
第一の水酸化マグネシウムケーキに、乾燥水酸化マグネシウム質量基準量に対して5~100倍の純水を加え、攪拌した後、濾過、水洗して、第二の水酸化マグネシウムケーキを得る工程(D-2);
第一の水酸化マグネシウムケーキの代わりに、第二の水酸化マグネシウムケーキに対して、工程(D-2)を1~20回繰り返し、高純度水酸化マグネシウムケーキを得る工程(D-3);及び
高純度水酸化マグネシウムケーキを乾燥させて、水酸化マグネシウム微粒子を得る工程(D-4);
を含む、請求項12記載の水酸化マグネシウム微粒子の製造方法。 - 工程(A)が、
粗塩化マグネシウム水溶液を用意する工程(A-1);
粗塩化マグネシウムを、1~18Nのアルカリ水溶液と、反応率が1~30mol%で反応させて、粗水酸化マグネシウムスラリーを得る工程(A-2);及び
粗水酸化マグネシウムスラリーに、凝集剤を添加した後、水酸化マグネシウムを濾過して、濾液として塩化マグネシウム溶液を得るか、又は凝集剤を添加し、水酸化マグネシウムを凝集沈殿させ、上澄液として塩化マグネシウム水溶液を得る工程(A-3)
を含む、請求項12又は13記載の水酸化マグネシウム微粒子の製造方法。 - 請求項1~5のいずれか1項記載の水酸化マグネシウム微粒子又は請求項12~14のいずれか1項記載の方法で得られた水酸化マグネシウム微粒子を、大気雰囲気中で、500~1500℃で焼成する工程(E)を含む、酸化マグネシウム微粒子の製造方法。
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