JP6282908B2 - 酸化亜鉛の製造方法 - Google Patents
酸化亜鉛の製造方法 Download PDFInfo
- Publication number
- JP6282908B2 JP6282908B2 JP2014057732A JP2014057732A JP6282908B2 JP 6282908 B2 JP6282908 B2 JP 6282908B2 JP 2014057732 A JP2014057732 A JP 2014057732A JP 2014057732 A JP2014057732 A JP 2014057732A JP 6282908 B2 JP6282908 B2 JP 6282908B2
- Authority
- JP
- Japan
- Prior art keywords
- zinc oxide
- zinc
- compound
- shape
- salt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims description 244
- 239000011787 zinc oxide Substances 0.000 title claims description 120
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 150000003752 zinc compounds Chemical class 0.000 claims description 24
- 150000003839 salts Chemical class 0.000 claims description 23
- 239000000725 suspension Substances 0.000 claims description 19
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical group [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 11
- 230000032683 aging Effects 0.000 claims description 9
- 150000003868 ammonium compounds Chemical class 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 2
- 235000014692 zinc oxide Nutrition 0.000 description 116
- 239000002245 particle Substances 0.000 description 37
- 235000002639 sodium chloride Nutrition 0.000 description 24
- 150000001875 compounds Chemical class 0.000 description 23
- -1 amine compound Chemical class 0.000 description 19
- 239000003513 alkali Substances 0.000 description 17
- 239000000203 mixture Substances 0.000 description 17
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 15
- 239000002537 cosmetic Substances 0.000 description 14
- 229920005989 resin Polymers 0.000 description 12
- 239000011347 resin Substances 0.000 description 12
- 239000011342 resin composition Substances 0.000 description 11
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 150000002894 organic compounds Chemical class 0.000 description 9
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 8
- 239000011231 conductive filler Substances 0.000 description 8
- 229910052725 zinc Inorganic materials 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 150000001339 alkali metal compounds Chemical class 0.000 description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 description 6
- 239000000945 filler Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 150000003751 zinc Chemical class 0.000 description 6
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 6
- 229910000368 zinc sulfate Inorganic materials 0.000 description 6
- 229960001763 zinc sulfate Drugs 0.000 description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 238000000635 electron micrograph Methods 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 239000001099 ammonium carbonate Substances 0.000 description 4
- 239000000908 ammonium hydroxide Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000002431 foraging effect Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 150000002484 inorganic compounds Chemical class 0.000 description 4
- 229910010272 inorganic material Inorganic materials 0.000 description 4
- 230000003472 neutralizing effect Effects 0.000 description 4
- 229920001296 polysiloxane Polymers 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000012463 white pigment Substances 0.000 description 4
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 4
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 4
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 3
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 235000019270 ammonium chloride Nutrition 0.000 description 3
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 3
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 3
- 235000011130 ammonium sulphate Nutrition 0.000 description 3
- 239000013522 chelant Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 239000008199 coating composition Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- ROBFUDYVXSDBQM-UHFFFAOYSA-N hydroxymalonic acid Chemical compound OC(=O)C(O)C(O)=O ROBFUDYVXSDBQM-UHFFFAOYSA-N 0.000 description 3
- 229920005862 polyol Polymers 0.000 description 3
- 230000005070 ripening Effects 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000001509 sodium citrate Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- HRXKRNGNAMMEHJ-UHFFFAOYSA-K trisodium citrate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O HRXKRNGNAMMEHJ-UHFFFAOYSA-K 0.000 description 3
- 229940038773 trisodium citrate Drugs 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 3
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 3
- 229940007718 zinc hydroxide Drugs 0.000 description 3
- 229910052726 zirconium Inorganic materials 0.000 description 3
- USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 description 2
- 239000005695 Ammonium acetate Substances 0.000 description 2
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 2
- DCXYFEDJOCDNAF-UHFFFAOYSA-N Asparagine Chemical compound OC(=O)C(N)CC(N)=O DCXYFEDJOCDNAF-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 2
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- 235000001014 amino acid Nutrition 0.000 description 2
- 229940024606 amino acid Drugs 0.000 description 2
- 235000019257 ammonium acetate Nutrition 0.000 description 2
- 229940043376 ammonium acetate Drugs 0.000 description 2
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 2
- 235000012501 ammonium carbonate Nutrition 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 150000007942 carboxylates Chemical class 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000000499 gel Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 239000011941 photocatalyst Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
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- 150000003077 polyols Chemical class 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
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- 239000000047 product Substances 0.000 description 2
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 2
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- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
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- WGGNJZRNHUJNEM-UHFFFAOYSA-N 2,2,4,4,6,6-hexamethyl-1,3,5,2,4,6-triazatrisilinane Chemical compound C[Si]1(C)N[Si](C)(C)N[Si](C)(C)N1 WGGNJZRNHUJNEM-UHFFFAOYSA-N 0.000 description 1
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Description
(1)亜鉛酸化物の懸濁液を40℃以上に加熱し、その温度でのpHを7以上に維持して熟成することを特徴とする酸化亜鉛の製造方法、
(2)亜鉛酸化物と、亜鉛化合物とカルボン酸及び/又はその塩とを混合した懸濁液を40℃以上に加熱し、その温度でのpHを7以上に維持して熟成することを特徴とする酸化亜鉛の製造方法、
(3)前記の(1)又は(2)の方法により製造される薄片状、六角板状、六角柱状又はそれらに類似した形状を有する酸化亜鉛、
(4)前記の(1)又は(2)の方法により製造される針状、棒状又はそれに類似した形状を有する酸化亜鉛、
(5)前記の酸化亜鉛を含む熱伝導性フィラー、その熱伝導性フィラーを含む放熱性組成物、
(6)前記の酸化亜鉛を含む紫外線遮蔽材、その紫外線遮蔽剤を含む化粧料等である。
また、本発明の酸化亜鉛は、形状や大きさが整い、結晶性や分散性が良く、嵩密度が低く充填性が良いことから、熱伝導性フィラー、充填剤、白色顔料、セラミックス原料等に用いることができ、化粧料、外用剤、塗料、樹脂組成物、放熱性組成物等に配合することができる。化粧料に配合すると、特定の大きさを有することから分散性が良く肌へのすべり感が良くなる。
レイノルズ係数=(翼径)2×撹拌速度×溶液密度/溶液粘度
混合時間は適宜設定できるが、例えば1秒〜1時間程度が好ましく、1秒〜30分程度がより好ましい。
(1)ポリカルボン酸、特にジカルボン酸、トリカルボン酸、例えば、シュウ酸、フマル酸。
(2)ヒドロキシポリカルボン酸、特にヒドロキシジ−又はヒドロキシトリ−カルボン酸、例えばリンゴ酸、クエン酸又はタルトロン酸。
(3)(ポリヒドロキシ)モノカルボン酸、例えばグルコヘプトン酸又はグルコン酸。
(4)ポリ(ヒドロキシカルボン酸)、例えば酒石酸。
(5)ジカルボキシルアミノ酸及びその対応するアミド、例えばアスパラギン酸、アスパラギン又はグルタミン酸。
(6)ヒドロキシル化され又はヒドロキシル化されていないモノカルボキシルアミノ酸、例えばリジン、セリン又はトレオニン。
カルボン酸塩としては、どのような塩でも制限なく用いることができるが、例えばナトリウム、カリウム等のアルカリ金属塩、アンモニウム塩等を用いることができる。カルボン酸及び/又はその塩の量は、その亜鉛化合物の亜鉛原子に対するカルボキシル基(−COOH)及びその塩(−COOM、ここで、Mはアルカリ金属、アンモニウム等を示す。)の合量のモル比で表すが、これはカルボキシル基(−COOH)とその塩(−COOM)の合量が酸化亜鉛の粒子形状等に影響を及ぼすためである。例えばクエン酸は1分子中に3個のカルボシキル基を有するため、3個分の影響力がある。カルボン酸及び/又はその塩の添加量は、亜鉛化合物の亜鉛原子に対するモル比で表して0.001〜0.1が好ましく、0.005〜0.05の範囲の量がより好ましく、0.007〜0.03の範囲が更に好ましい。カルボキシル基のモル比を0.001より少なくするとその添加効果が得られにくいため好ましくない。
重量平均長軸径=Σ(Ln・Ln・Dn2)/Σ(Ln・Dn2)
重量平均短軸径=Σ(Dn・Ln・Dn2)/Σ(Ln・Dn2)
上記式中、nは計測した個々の粒子の番号を表し、Lnは第n番目の粒子の長軸径、Dnは第n番目の粒子の短軸径をそれぞれ表す。)
(1)薄片状又はそれらに類似した形状を有する酸化亜鉛
この酸化亜鉛は、薄片状あるいは板状の面を有し、その面に垂直方向に伸びた厚みを有する。平均わたり径は、0.1〜20.0μmの範囲がより好ましく、0.5〜10.0μmの範囲がより好ましく、1〜8.0μmの範囲が更に好ましい。平均厚みは0.01〜2.0μmが好ましく、より好ましくは0.05〜1.0μmである。
この酸化亜鉛は、六角形の面を有し、その面に垂直方向に伸びた厚みを有する。平均わたり径は、0.1〜20.0μmの範囲がより好ましく、0.5〜10.0μmの範囲がより好ましく、1.0〜8.0μmの範囲が更に好ましい。平均厚みは0.01〜2.0μmが好ましく、より好ましくは0.05〜1.0μmである。
この酸化亜鉛は、六角形の面を有し、その面に垂直方向に伸びた六角柱の形状を有する。その柱の平均短軸径は0.1〜10.0μmが好ましく、より好ましくは0.5〜5.0μmである。また、柱の平均長軸径は0.2〜20.0μmが好ましく、より好ましくは0.5〜10.0μmである。また、電子顕微鏡写真を詳細に観察すると、六角柱状の中央部にくびれがあり、その部分の短軸径は両端部に比べ小さい酸化亜鉛粒子がある。このような六角柱の柱の両端部と中央部の短軸径が、両端部に比し中央部の短軸径が小さい形状を本発明では鼓に類似した形状(鼓形状)という。(中央部の短軸径)/(両端部の短軸径)は、0.5〜0.99程度が好ましく、0.7〜0.99程度がより好ましい。このような鼓形状は、中央部のくびれ部分に存在する六角板状核晶を対称面とした成長双晶が起こったような形状を有する。
この酸化亜鉛は、針状、棒状の形状を有する。その柱の平均短軸径は0.1〜10.0μmが好ましく、より好ましくは0.5〜5.0μmである。また、柱の平均長軸径は0.2〜20.0μmが好ましく、より好ましくは0.5〜10.0μmである。
この酸化亜鉛は、針状、棒状の形状を有し、端面に開口を有する。端面に開口を有することからマカロニ状、あるいはそれに類似した形状というが、開口が貫通したチューブ状になっていても良く、開口が貫通していない状態でも良い。その柱の平均短軸径は0.1〜10.0μmが好ましく、より好ましくは0.5〜5.0μmである。また、柱の平均長軸径は0.2〜20.0μmが好ましく、より好ましくは0.5〜10.0μmである。
酸化亜鉛粒子が集積した集合体であり、集合体の粒子径は適宜設定することができ、0.01〜50μmの大きさを有していても良く、0.02〜30μmがより好ましく、0.05〜20μmが更に好ましい。
亜鉛酸化物(六角板状)の10%水性スラリーにモノエタノールアミン0.70モルを添加し、100℃に昇温し、pH10で1時間熟成を行い、本発明の酸化亜鉛(試料A)を得た。
亜鉛酸化物(六角板状)の10%水性スラリーに、硫酸亜鉛0.30モル、クエン酸三ナトリウム0.003モル、モノエタノールアミン0.70モルをそれぞれ添加し、100℃に昇温し、pH10で1時間熟成を行い、本発明の酸化亜鉛(試料B)を得た。
亜鉛酸化物(六角板状)の10%水性スラリーに、硫酸亜鉛0.30モル、クエン酸三ナトリウム0.010モル、モノエタノールアミン0.70モルをそれぞれ添加し、100℃に昇温し、pH10で2時間熟成を行い、本発明の酸化亜鉛(試料C)を得た。
亜鉛酸化物(六角板状)の10%水性スラリーに、硫酸亜鉛0.30モル、クエン酸三ナトリウム0.010モル、水酸化アンモニウム0.70モルをそれぞれ添加し、100℃に昇温し、水酸化アンモニウムを添加しながらpH10で2時間熟成を行い、本発明の酸化亜鉛(試料D)を得た。
Claims (3)
- 亜鉛酸化物と、亜鉛化合物とカルボン酸及び/又はその塩とを混合した懸濁液を40℃以上に加熱し、その温度でのpHを7以上に維持して熟成する酸化亜鉛の製造方法。
- アンモニウム化合物を添加してpHを7以上に維持する請求項1に記載の酸化亜鉛の製造方法。
- 亜鉛化合物と、その亜鉛化合物の亜鉛原子に対するモル比で表して、0.001〜0.1の範囲の量のカルボン酸及び/又はその塩とを添加する請求項1に記載の酸化亜鉛の製造方法。
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