JP2018020919A - Strontium titanate-based fine particle for toner and manufacturing method therefor - Google Patents
Strontium titanate-based fine particle for toner and manufacturing method therefor Download PDFInfo
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- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000010419 fine particle Substances 0.000 title claims abstract description 58
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000011164 primary particle Substances 0.000 claims abstract description 48
- 239000010936 titanium Substances 0.000 claims abstract description 44
- 239000000654 additive Substances 0.000 claims abstract description 24
- 230000000996 additive effect Effects 0.000 claims abstract description 23
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 8
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- -1 titanium oxide compound Chemical class 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 112
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 42
- 238000006243 chemical reaction Methods 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 30
- 239000002253 acid Substances 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 19
- 229910052712 strontium Inorganic materials 0.000 claims description 12
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 8
- 229920002545 silicone oil Polymers 0.000 claims description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 claims description 6
- 150000003609 titanium compounds Chemical class 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 5
- 229910002367 SrTiO Inorganic materials 0.000 claims description 2
- 125000003545 alkoxy group Chemical group 0.000 claims description 2
- 230000002194 synthesizing effect Effects 0.000 claims description 2
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 36
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 abstract description 23
- 230000002209 hydrophobic effect Effects 0.000 abstract description 11
- 230000007613 environmental effect Effects 0.000 abstract description 8
- 239000004408 titanium dioxide Substances 0.000 abstract description 5
- 239000006185 dispersion Substances 0.000 abstract description 2
- 238000005243 fluidization Methods 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 48
- 238000003756 stirring Methods 0.000 description 44
- 239000000243 solution Substances 0.000 description 37
- 239000002002 slurry Substances 0.000 description 24
- 229910010413 TiO 2 Inorganic materials 0.000 description 21
- 238000001914 filtration Methods 0.000 description 19
- 239000002244 precipitate Substances 0.000 description 19
- 239000003795 chemical substances by application Substances 0.000 description 17
- 239000012756 surface treatment agent Substances 0.000 description 17
- 238000000635 electron micrograph Methods 0.000 description 15
- 229910001631 strontium chloride Inorganic materials 0.000 description 12
- AHBGXTDRMVNFER-UHFFFAOYSA-L strontium dichloride Chemical compound [Cl-].[Cl-].[Sr+2] AHBGXTDRMVNFER-UHFFFAOYSA-L 0.000 description 12
- 238000000634 powder X-ray diffraction Methods 0.000 description 11
- 238000010306 acid treatment Methods 0.000 description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 238000001935 peptisation Methods 0.000 description 9
- 239000003513 alkali Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 230000008021 deposition Effects 0.000 description 8
- 238000006477 desulfuration reaction Methods 0.000 description 8
- 230000023556 desulfurization Effects 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 238000002441 X-ray diffraction Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 7
- ICAKDTKJOYSXGC-UHFFFAOYSA-K lanthanum(iii) chloride Chemical compound Cl[La](Cl)Cl ICAKDTKJOYSXGC-UHFFFAOYSA-K 0.000 description 7
- 238000003786 synthesis reaction Methods 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 239000011777 magnesium Substances 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 238000010908 decantation Methods 0.000 description 4
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000012066 reaction slurry Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000012798 spherical particle Substances 0.000 description 4
- 229910000018 strontium carbonate Inorganic materials 0.000 description 4
- 238000004876 x-ray fluorescence Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000006087 Silane Coupling Agent Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 230000000711 cancerogenic effect Effects 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 231100000315 carcinogenic Toxicity 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 description 2
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 2
- 108091008695 photoreceptors Proteins 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- DHEQXMRUPNDRPG-UHFFFAOYSA-N strontium nitrate Chemical compound [Sr+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O DHEQXMRUPNDRPG-UHFFFAOYSA-N 0.000 description 2
- UBXAKNTVXQMEAG-UHFFFAOYSA-L strontium sulfate Chemical compound [Sr+2].[O-]S([O-])(=O)=O UBXAKNTVXQMEAG-UHFFFAOYSA-L 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- JLGNHOJUQFHYEZ-UHFFFAOYSA-N trimethoxy(3,3,3-trifluoropropyl)silane Chemical compound CO[Si](OC)(OC)CCC(F)(F)F JLGNHOJUQFHYEZ-UHFFFAOYSA-N 0.000 description 2
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical class CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 231100000260 carcinogenicity Toxicity 0.000 description 1
- 230000007670 carcinogenicity Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- TVQLLNFANZSCGY-UHFFFAOYSA-N disodium;dioxido(oxo)tin Chemical compound [Na+].[Na+].[O-][Sn]([O-])=O TVQLLNFANZSCGY-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 230000005661 hydrophobic surface Effects 0.000 description 1
- 238000010335 hydrothermal treatment Methods 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- YXEUGTSPQFTXTR-UHFFFAOYSA-K lanthanum(3+);trihydroxide Chemical compound [OH-].[OH-].[OH-].[La+3] YXEUGTSPQFTXTR-UHFFFAOYSA-K 0.000 description 1
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000000025 natural resin Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100001081 no carcinogenicity Toxicity 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000011941 photocatalyst Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229940079864 sodium stannate Drugs 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- UUCCCPNEFXQJEL-UHFFFAOYSA-L strontium dihydroxide Chemical compound [OH-].[OH-].[Sr+2] UUCCCPNEFXQJEL-UHFFFAOYSA-L 0.000 description 1
- 229910001866 strontium hydroxide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- NBXZNTLFQLUFES-UHFFFAOYSA-N triethoxy(propyl)silane Chemical compound CCC[Si](OCC)(OCC)OCC NBXZNTLFQLUFES-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Developing Agents For Electrophotography (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Description
本発明は、チタン酸ストロンチウム系微細粒子およびその製造法に関し、特に電子写真方式を利用した複写機およびプリンター等の複写画像を形成するための静電潜像現像用トナーの外添剤として有用なチタン酸ストロンチウム系微細粒子およびその製造法に関する。 The present invention relates to fine strontium titanate particles and a method for producing the same, and particularly useful as an external additive for a toner for developing an electrostatic latent image for forming a copy image of a copying machine or a printer using an electrophotographic method. The present invention relates to strontium titanate-based fine particles and a method for producing the same.
二酸化チタンの微粒子は、紫外線カットの目的で化粧品、塗料、インキ、プラスチック、光触媒などに使用される他、電子写真用トナーの帯電調整剤、流動化剤などにも広く使用されている。これらの用途には、分散性の向上や吸湿性の防止のために、表面を疎水化処理された酸化チタンが使用されている。 The fine particles of titanium dioxide are used for cosmetics, paints, inks, plastics, photocatalysts and the like for the purpose of cutting ultraviolet rays, and are also widely used for charge control agents and fluidizing agents for electrophotographic toners. In these applications, titanium oxide having a hydrophobic surface is used to improve dispersibility and prevent hygroscopicity.
しかし、近年、基体となる二酸化チタンがＩＡＲＣ（国際がん研究機関）による「発がん性のリスク情報のリスト」において、グループ３（人に対する発がん性については分類できない（不明である）」から、グループ２Ｂ（人に対して発がん性があるかもしれない」にランクが変更され、疎水性酸化チタン微粒子の代替物となる疎水性微粒子の開発が強く望まれている。 However, in recent years, titanium dioxide, which is the base material, has been grouped from Group 3 (Cannot classify carcinogenicity to humans (unknown) in the “Carcinogenic Risk Information List”) by IARC (International Cancer Research Institute). The rank has been changed to 2B (which may be carcinogenic to humans), and the development of hydrophobic fine particles as an alternative to hydrophobic titanium oxide fine particles is strongly desired.
一方で、電子写真システム方式を利用した複写機およびプリンターでは、写真デジタル化等により高精細化、高画質化の画像要求があると共に、コスト低減の面から長期間にわたる安定性（耐候性）の要求がある。電子写真システム方式の長期間の運転では、感光体の表面に紙粉や流動化剤が付着するフィルミング現象や、帯電装置から発生するオゾンと空気中の窒素が反応して生成するＮＯＸ が空気中の水分に吸着して発生する帯電生成物による画像流れ現象が起こる。そのため、トナーの外添剤として流動性付与剤、帯電制御剤、離型剤の他に研磨剤を添加し、感光体の表面の付着物や帯電生成物を除去する工夫がなされている。特に、チタン酸ストロンチウムは、モース硬度が５〜６であり、感光体の表面強度との関係から研磨剤として有用であり、シリカ粒子又はチタニア粒子に添加する無機微粒子としてトナーに使用されてきた。 On the other hand, copiers and printers using an electrophotographic system system have high-definition and high-quality image demands due to digitization of photographs, etc. and long-term stability (weather resistance) from the viewpoint of cost reduction. There is a request. In the long-term operation of the electrophotographic system method, there is a filming phenomenon in which paper dust or a fluidizing agent adheres to the surface of the photoconductor, or NO X generated by a reaction between ozone generated from the charging device and nitrogen in the air. An image flow phenomenon occurs due to a charged product generated by being adsorbed by moisture in the air. For this reason, it has been devised that an abrasive is added as a toner external additive in addition to a fluidity imparting agent, a charge control agent, and a release agent to remove deposits and charged products on the surface of the photoreceptor. In particular, strontium titanate has a Mohs hardness of 5 to 6, is useful as an abrasive because of its relationship with the surface strength of the photoreceptor, and has been used in toners as inorganic fine particles added to silica particles or titania particles.
例えば、シリカ粒子又はチタニア粒子に添加する無機微粒子として０．０１μｍ〜０．０８μｍの微粒子チタン酸ストロンチウムが紹介されている（特許文献１）。特許文献１に記載の微粒子チタン酸ストロンチウムは、低温焼成の乾式法によって得られる粗粒の少ない微粒子であり、トナー表面に付着し易く、トナーの粉体特性を変化させ、粉煙防止効果を有すると共に、感光体上のフィルミングや融着を防止する優れた研磨効果があるが、帯電生成物の除去に不十分であったとして、湿式法で合成された立方体または直方体の０．０３μｍ〜０．３μｍのチタン酸ストロンチウムが提案されている（特許文献２）。 For example, a fine particle strontium titanate of 0.01 μm to 0.08 μm has been introduced as an inorganic fine particle added to silica particles or titania particles (Patent Document 1). The fine-particle strontium titanate described in Patent Document 1 is a fine particle with few coarse particles obtained by a dry method of low-temperature firing, easily adheres to the toner surface, changes the powder characteristics of the toner, and has an anti-smoke effect In addition, although there is an excellent polishing effect for preventing filming and fusion on the photosensitive member, it is insufficient for removing the charged product, so that a cube or a rectangular parallelepiped synthesized by a wet method is 0.03 μm to 0 μm. 3 μm of strontium titanate has been proposed (Patent Document 2).
本願発明者等は、チタン源としてチタン化合物の加水分解物の鉱酸解膠品を用い、またストロンチウム源として水溶性化合物を用い、その混合液に５０℃以上沸点以下でアルカリ水溶液を添加しながら反応して合成する方法即ち常温湿式法により、焼成法に比べて粒度分布の良好なチタン酸ストロンチウム微細粒子を得ることができることを提案している開示した（特許文献３）。また、チタン酸ストロンチウム自体の帯電量の変動や湿度の影響による凝集を抑えるために、当該チタン酸ストロンチウムの表面に有機物等を被覆処理する必要があり、常温湿式法で得られるチタン酸ストロンチウムを酸で溶解処理してＳｒ／Ｔｉモル比を調整することにより、シリコーンオイル、ステアリン酸ナトリウム、シランカップリング剤等の有機表面処理剤の被着が容易となり、トナーの帯電制御剤あるいは研磨剤として用いるときの環境特性および帯電特性が向上することを見いだした（特許文献４）。 The inventors of the present application use a mineral acid peptized product of a hydrolyzate of a titanium compound as a titanium source, use a water-soluble compound as a strontium source, and add an aqueous alkali solution at a boiling point of 50 ° C. or higher and a boiling point or lower to the mixture. It has been disclosed that fine particles of strontium titanate having a good particle size distribution can be obtained by a method of synthesis by reaction, that is, a room temperature wet method (Patent Document 3). In addition, in order to suppress aggregation due to fluctuations in the charge amount of the strontium titanate itself and the influence of humidity, it is necessary to coat the surface of the strontium titanate with an organic substance or the like. By adjusting the Sr / Ti molar ratio by dissolution treatment, it is easy to apply organic surface treatment agents such as silicone oil, sodium stearate, silane coupling agents, etc., and it is used as a toner charge control agent or abrasive. It has been found that the environmental characteristics and the charging characteristics are improved (Patent Document 4).
これまでに提案されているチタン酸ストロンチウム微細粒子は、尖ったエッジを持つ直方体状粒子であるため、研磨剤として使用した場合にはそのエッジによる研磨効果に優れている。しかしながら、直方体状粒子であるため電子写真用トナー外添剤の流動化剤としては不十分なものであった。 The strontium titanate fine particles that have been proposed so far are rectangular parallelepiped particles having sharp edges, and therefore, when used as an abrasive, the strontium titanate fine particles have an excellent polishing effect due to the edges. However, since it is a rectangular parallelepiped particle, it was insufficient as a fluidizing agent for an electrophotographic toner external additive.
本発明の目的は、分散が良好で、かつ、環境特性および流動化剤として良好なトナー外添剤として有用で、しかも疎水性二酸化チタンの代替物となり得るチタン酸ストロンチウム系微細粒子およびその製造方法を提供することにある。 An object of the present invention is to provide strontium titanate-based fine particles having good dispersion, useful as an external toner additive excellent in environmental characteristics and fluidizing agent, and capable of replacing hydrophobic titanium dioxide, and a method for producing the same Is to provide.
本発明者らは、チタン酸ストロンチウムに着目し、トナー用外添剤として分散性に優れ、環境特性および流動化剤として最適な粒径および粒子径状とする手法について検討した結果、常温湿式法による合成反応において、Ｌａ、Ｍｇ、Ｃａ、Ｓｎ及びＳｉから選択される第３成分Ｍを添加することで、直方体または立方体形状の粒子が面取りされて球状粒子となり、分散性及び流動性が良好なチタン酸ストロンチウム系微細粒子が得られることを見出し、本発明を完成させた。 The inventors of the present invention focused on strontium titanate, and as a result of studying a method for obtaining excellent particle size and particle size as an external additive for toner, having excellent dispersibility, environmental characteristics, and a fluidizing agent. In the synthesis reaction according to, by adding the third component M selected from La, Mg, Ca, Sn and Si, the rectangular or cubic particles are chamfered into spherical particles, and the dispersibility and fluidity are good The inventors have found that strontium titanate-based fine particles can be obtained and completed the present invention.
本発明によれば一般式ＳｒＴｉＯ３ で示されるペロブスカイト型チタン酸化合物を主成分とし、Ｌａ、Ｍｇ、Ｃａ、Ｓｎ及びＳｉから選択される第３成分Ｍを含み、Ｔｉに対する（Ｓｒ＋Ｍ）のモル比：（Ｓｒ＋Ｍ）／Ｔｉが０．７０〜０．９０の範囲にあり、平均円形度０．８０〜１．００の球状を有し、平均一次粒子径が０．０２μｍ〜０．０６μｍの範囲にあり、一次粒子径の四分偏差を該平均一次粒子径で割った値が０．２０未満、好ましくは０．１３〜０．１９の範囲にあることを特徴とするチタン酸ストロンチウム系微細粒子が提供される。ここで、「平均円形度」は個々の粒子の円形度ではなく、粒子の集合体としての平均値であり、球状粒子の占有割合を意味する。したがって、粒子全体としての平均円形度が０．８０〜１．００の範囲にあればよく、個々の粒子の円形度がこの範囲を逸脱していてもよい。つまり、一部の粒子が直方体または立方体形状であってもよい。また、「一次粒子径の四分偏差を該平均一次粒子径で割った値」は粒度分布の幅の指標となり、この値が小さいほど粒度分布が狭いことを意味する。（Ｓｒ＋Ｍ）／Ｔｉモル比が前記の範囲を外れると、チタン酸ストロンチウム系微細粒子の球状粒子が得られず、また、一次粒子径および平均円形度が前記の範囲を外れると、トナーの帯電特性および流動性に悪影響を与えるため好ましくない。チタン酸ストロンチウム系微細粒子の粒径が微細で、凝結粒子が少なく粒度分布が狭いことがトナーの帯電安定性や流動性の付与等に極めて有効である。 According to the present invention, the main component is a perovskite type titanate compound represented by the general formula SrTiO 3 , which includes the third component M selected from La, Mg, Ca, Sn and Si, and the molar ratio of (Sr + M) to Ti : (Sr + M) / Ti is in a range of 0.70 to 0.90, has a spherical shape with an average circularity of 0.80 to 1.00, and an average primary particle size in a range of 0.02 μm to 0.06 μm. A strontium titanate-based fine particle characterized in that a value obtained by dividing the quadratic deviation of the primary particle diameter by the average primary particle diameter is less than 0.20, preferably in the range of 0.13 to 0.19. Provided. Here, “average circularity” is not the circularity of individual particles, but an average value as an aggregate of particles, and means an occupation ratio of spherical particles. Therefore, the average circularity of the entire particle may be in the range of 0.80 to 1.00, and the circularity of individual particles may be out of this range. That is, some of the particles may have a rectangular parallelepiped shape or a cubic shape. Further, “a value obtained by dividing the quadrant deviation of the primary particle diameter by the average primary particle diameter” is an index of the width of the particle size distribution, and the smaller the value, the narrower the particle size distribution. When the (Sr + M) / Ti molar ratio is out of the above range, spherical particles of strontium titanate fine particles cannot be obtained, and when the primary particle diameter and average circularity are out of the above range, the charging characteristics of the toner are obtained. In addition, it adversely affects fluidity and is not preferable. The fine particle size of the strontium titanate-based fine particles, the small amount of condensed particles, and the narrow particle size distribution are extremely effective for imparting charging stability and fluidity of the toner.
円形度は、粒子を二次元に投影した時の円形度で評価し、（粒子面積と等しい円の周囲長）／（粒子周囲長）で求めることができる。また、平均円形度は、チタン酸ストロンチウム系微細粒子２００個の円形度の平均値である。 The circularity can be evaluated by (circular length of a circle equal to the particle area) / (peripheral length of particle) by evaluating the circularity when the particles are projected two-dimensionally. The average circularity is an average value of the circularity of 200 strontium titanate fine particles.
また、前記チタン酸ストロンチウム系微細粒子を３．０重量％〜２０．０重量％の一般式：ＲｎＳｉＲ’ｍ
（ただし、Ｒは炭化水素基、Ｒ'はアルコキシ基、ｎは１〜３の整数、ｍは１〜３の整数を示し、ｎ＋ｍ＝４を満たす。）
で表される１乃至２種類のアルコキシシランで被覆処理したトナー用外添剤が提供される。本トナー用外添剤は、トナーの疎水性、環境特性および帯電特性を向上させる。
The strontium titanate fine particles are contained in an amount of 3.0% to 20.0% by weight of the general formula: RnSiR′m
(However, R represents a hydrocarbon group, R ′ represents an alkoxy group, n represents an integer of 1 to 3, m represents an integer of 1 to 3, and satisfies n + m = 4.)
An external additive for toner that is coated with one or two types of alkoxysilanes represented by the formula: This external additive for toner improves the hydrophobicity, environmental characteristics and charging characteristics of the toner.
同様に、本発明のチタン酸ストロンチウム系微細粒子を５．０重量％〜１４．０重量％のステアリン酸ナトリウムで被覆処理したトナー用外添剤が提供される。本トナー用外添剤は、トナーに疎水性を付与でき、環境特性および帯電特性を向上させる。特に、本発明のチタン酸ストロンチウム系微細粒子の表面のアルカリ成分が少ないため、ステアリン酸による被覆率が高くなる。 Similarly, an external additive for toner is provided in which the strontium titanate-based fine particles of the present invention are coated with 5.0 to 14.0% by weight of sodium stearate. The external additive for toner can impart hydrophobicity to the toner and improve environmental characteristics and charging characteristics. In particular, since the amount of alkali components on the surface of the strontium titanate fine particles of the present invention is small, the coverage with stearic acid is increased.
更に、本発明のチタン酸ストロンチウム系微細粒子を０．３重量％〜１０．０重量％のシリコーンオイルで被覆処理したトナー用外添剤が提供される。本トナー用外添剤は、トナーの流動性を向上させる。 Furthermore, an external additive for toner is provided in which the strontium titanate fine particles of the present invention are coated with 0.3% to 10.0% by weight of silicone oil. This external additive for toner improves the fluidity of the toner.
本発明のチタン酸ストロンチウム系微細粒子は、常圧加熱反応法により、チタン化合物の加水分解物の鉱酸解膠品と、ストロンチウムを含む水溶性化合物と、Ｌａ、Ｍｇ、Ｃａ、Ｓｎ及びＳｉから選択される第３成分Ｍの水溶性化合物を混合して、第３成分Ｍの添加量がストロンチウムに対して２ｍｏｌ％〜１５ｍｏｌ％相当となる混合液を調製し、当該混合液にアルカリ水溶液を添加しながら７０℃以上１００℃以下に加熱して、チタン酸ストロンチウムを主成分とする粒子を合成し、次いで、得られたチタン酸ストロンチウムを主成分とする粒子を酸で処理することを特徴とする製造方法により製造することができる。 The strontium titanate fine particles of the present invention are obtained from a mineral acid peptized product of a hydrolyzate of a titanium compound, a water-soluble compound containing strontium, La, Mg, Ca, Sn, and Si by an atmospheric pressure heating reaction method. A water-soluble compound of the selected third component M is mixed to prepare a mixed solution in which the added amount of the third component M is equivalent to 2 mol% to 15 mol% with respect to strontium, and an alkaline aqueous solution is added to the mixed solution While heating to 70 ° C. or more and 100 ° C. or less to synthesize particles containing strontium titanate as a main component, the resulting particles containing strontium titanate as a main component are then treated with an acid. It can be manufactured by a manufacturing method.
本発明のチタン酸ストロンチウム系微細粒子は、常圧加熱反応法に特有な形状である立方体または直方体状粒子を、Ｌａ、Ｍｇ、Ｃａ、Ｓｎ、Ｓｉから選択される第３成分Ｍを添加することにより、平均円形度０．８０〜１．００の球状に調整したものであり、また、（Ｓｒ＋Ｍ）／Ｔｉモル比０．７０以上０．９０以下とアルカリ成分が少ないため、有機表面処理剤の被着が容易である。また、本発明のチタン酸ストロンチウム系微細粒子は、粒径が微細で、凝結粒子が少なく粒度分布が狭いため、トナー用外添剤として用いる場合に、トナーに帯電安定性や流動性を良好に付与することができる。 The third component M selected from La, Mg, Ca, Sn, and Si is added to cubic or cuboid particles having a shape unique to the atmospheric pressure heating reaction method in the strontium titanate-based fine particles of the present invention. Is adjusted to a sphere having an average circularity of 0.80 to 1.00, and the (Sr + M) / Ti molar ratio is 0.70 or more and 0.90 or less, and the alkali component is small. Easy to deposit. Further, since the strontium titanate fine particles of the present invention have a fine particle size, few condensed particles and a narrow particle size distribution, when used as an external additive for toner, the toner has good charge stability and fluidity. Can be granted.
本発明のチタン酸ストロンチウム系微細粒子を、３．０重量％〜２０．０重量％のアルコキシシラン、５．０重量％〜１４．０重量％のステアリン酸ナトリウム或いは０．３重量％〜１０．０重量％のシリコーンオイルで被覆処理したトナー用外添剤は、帯電量の変動や湿度の影響による凝集が抑制され、分散性に優れ疎水性が高い。したがって、本発明のチタン酸ストロンチウム系微細粒子は、分散性及び環境安定性に優れ、また発がん性や毒性の問題も無いため、二酸化チタンの代替物としてトナーの帯電調整剤、流動化剤などの外添剤として適している。 The strontium titanate fine particles of the present invention are mixed with 3.0 to 20.0% by weight of alkoxysilane, 5.0 to 14.0% by weight of sodium stearate, or 0.3 to 10% by weight. The external additive for toner coated with 0% by weight of silicone oil has excellent dispersibility and high hydrophobicity, suppressing aggregation due to fluctuations in charge amount and the influence of humidity. Therefore, the strontium titanate fine particles of the present invention are excellent in dispersibility and environmental stability, and have no carcinogenicity or toxicity problems. Therefore, as a substitute for titanium dioxide, a toner charge adjusting agent, a fluidizing agent, etc. Suitable as an external additive.
本発明のチタン酸ストロンチウム系微細粒子は、代表的には、加圧容器を用いる水熱処理ではなく、常圧加熱反応法により、チタン化合物の加水分解物の鉱酸解膠品と、ストロンチウムを含む水溶性化合物と、Ｌａ、Ｍｇ、Ｃａ、Ｓｎ及びＳｉから選択される第３成分Ｍの水溶性化合物を混合して、第３成分Ｍの添加量がストロンチウムに対して２ｍｏｌ％〜１５ｍｏｌ％相当となる混合液を調製し、当該混合液にアルカリ水溶液を添加しながら７０℃以上１００℃以下に加熱して、チタン酸ストロンチウムを主成分とする粒子を合成し、次いで、得られたチタン酸ストロンチウムを主成分とする粒子を酸で処理することを特徴とする方法で製造される。 The strontium titanate-based fine particles of the present invention typically contain a mineral acid peptized product of a hydrolyzate of a titanium compound and strontium by a normal pressure heating reaction method rather than hydrothermal treatment using a pressurized vessel. A water-soluble compound is mixed with a water-soluble compound of the third component M selected from La, Mg, Ca, Sn and Si, and the amount of the third component M added is equivalent to 2 mol% to 15 mol% with respect to strontium. The mixture solution is prepared, heated to 70 ° C. or more and 100 ° C. or less while adding an alkaline aqueous solution to the mixture solution to synthesize particles containing strontium titanate as a main component, and then obtained strontium titanate Manufactured by a method characterized by treating particles as a main component with an acid.
（常圧加熱反応法）
前記酸化チタン源としてはチタン化合物の加水分解物の鉱酸解膠品を用いる。好ましくは、硫酸法で得られた、ＳＯ３ 含有量が１．０重量％以下、好ましくは０．５重量％以下のメタチタン酸を塩酸でｐＨを０．８〜１．５に調整して解膠したものを用いることで、粒度分布が良好なチタン酸ストロンチウム系微細粒子を得ることができる。メタチタン酸中ＳＯ３含有量が１．０重量％を超えると解膠が進まない。
(Normal pressure heating reaction method)
As the titanium oxide source, a mineral acid peptized product of a hydrolyzate of a titanium compound is used. Preferably, metatitanic acid obtained by the sulfuric acid method and having a SO 3 content of 1.0% by weight or less, preferably 0.5% by weight or less, is adjusted by adjusting the pH to 0.8 to 1.5 with hydrochloric acid. By using the glue, strontium titanate fine particles having a good particle size distribution can be obtained. When the SO 3 content in metatitanic acid exceeds 1.0% by weight, peptization does not proceed.
前記ストロンチウム源としては、硝酸ストロンチウム、塩化ストロンチウム、水酸化ストロンチウムなどを好ましく使用することができる。また、第３成分Ｍの水溶性化合物としては、硝酸ランタン、塩化ランタン、水酸化ランタン、硝酸マグネシウム、塩化マグネシウム、水酸化マグネシウム、硝酸カルシウム、塩化カルシウム、水酸化カルシウム、塩化スズ、スズ酸ナトリウム、ケイ酸ナトリウムなどを好ましく使用することができる。アルカリ水溶液としては、苛性アルカリを使用することができるが、中でも水酸化ナトリウム水溶液が好ましい。 As the strontium source, strontium nitrate, strontium chloride, strontium hydroxide and the like can be preferably used. The water-soluble compound of the third component M includes lanthanum nitrate, lanthanum chloride, lanthanum hydroxide, magnesium nitrate, magnesium chloride, magnesium hydroxide, calcium nitrate, calcium chloride, calcium hydroxide, tin chloride, sodium stannate, Sodium silicate and the like can be preferably used. As the alkaline aqueous solution, a caustic alkali can be used, and among them, a sodium hydroxide aqueous solution is preferable.
前記製造方法において、得られるチタン酸ストロンチウム系微細粒子の粒子径に影響を及ぼす因子としては、反応時における原料の混合割合、反応初期の酸化チタン源濃度、アルカリ水溶液を添加するときの温度及び添加速度などが挙げられる。また、粒子径状に影響を及ぼす因子としては、第３成分Ｍの添加量があり、目的の粒子径および粒子径状のものを得るため適宜調整することができる。なお、反応過程に於ける炭酸ストロンチウムの生成を防ぐために窒素ガス雰囲気下で反応させる等、炭酸ガスの混入を防ぐことが好ましい。 In the above production method, factors affecting the particle size of the obtained strontium titanate fine particles include the mixing ratio of raw materials during the reaction, the titanium oxide source concentration at the initial stage of the reaction, the temperature and addition when adding the aqueous alkali solution Speed and so on. Further, the factor affecting the particle size is the amount of the third component M added, and can be adjusted as appropriate in order to obtain the desired particle size and particle size. In addition, in order to prevent the production | generation of strontium carbonate in a reaction process, it is preferable to make it react in nitrogen gas atmosphere and to prevent mixing of a carbon dioxide gas.
反応時における酸化チタン源、ストロンチウム源および第３成分Ｍの混合割合は、（Ｓｒ＋Ｍ）／Ｔｉのモル比で０．９〜１．６、好ましくは１．１〜１．４が適切である。酸化チタン源は水への溶解度が低いため、（Ｓｒ＋Ｍ）／Ｔｉモル比が１以下の場合、反応生成物はチタン酸ストロンチウム系微細粒子だけでなく、未反応の酸化チタンが残存し易くなる。反応初期の酸化チタン源の濃度としては、ＴｉＯ２ として０．３ｍｏｌ／Ｌ〜１．３ｍｏｌ／Ｌ、好ましくは０．６ｍｏｌ／Ｌ〜１．０ｍｏｌ／Ｌが適切である。 The mixing ratio of the titanium oxide source, the strontium source and the third component M during the reaction is 0.9 to 1.6, preferably 1.1 to 1.4 in terms of a molar ratio of (Sr + M) / Ti. Since the titanium oxide source has low solubility in water, when the (Sr + M) / Ti molar ratio is 1 or less, not only the strontium titanate-based fine particles but also unreacted titanium oxide tends to remain in the reaction product. As the concentration of the titanium oxide source at the initial stage of the reaction, 0.3 mol / L to 1.3 mol / L, preferably 0.6 mol / L to 1.0 mol / L as TiO 2 is appropriate.
アルカリ水溶液を添加するときの温度は、高いほど結晶性の良好な生成物が得られるが、１００℃以上ではオートクレーブ等の圧力容器が必要であるため、実用的には７０℃〜１００℃の範囲が適切である。また、アルカリ水溶液の添加速度は、添加速度が遅いほど大きな粒子径のチタン酸ストロンチウム粒子が得られ、添加速度が速いほど小さな粒子径のチタン酸ストロンチウム粒子が得られる。アルカリ水溶液の添加速度は、仕込み原料に対し０．２当量／ｈ〜１．６当量／ｈ、好ましくは０．３当量／ｈ〜１．４当量／ｈが適切であり、得ようとする粒子径に応じて適宜調整することができる。 The higher the temperature at which the aqueous alkali solution is added, the better the crystallinity of the product is obtained. However, since a pressure vessel such as an autoclave is required at 100 ° C. or higher, a practical range of 70 ° C. to 100 ° C. Is appropriate. In addition, as the addition rate of the aqueous alkali solution is decreased, strontium titanate particles having a larger particle size are obtained, and as the addition rate is increased, strontium titanate particles having a smaller particle size are obtained. The addition rate of the aqueous alkali solution is suitably 0.2 equivalent / h to 1.6 equivalent / h, preferably 0.3 equivalent / h to 1.4 equivalent / h, with respect to the charged raw material. It can adjust suitably according to a diameter.
（酸処理）
本発明の製造方法においては、常圧加熱反応によって得られるチタン酸ストロンチウム系化合物をさらに酸処理する。常圧加熱反応を行って、チタン酸ストロンチウムを合成する際に、酸化チタン源、ストロンチウム源および第３成分Ｍの混合割合が（Ｓｒ＋Ｍ）／Ｔｉのモル比で１．０を超える場合、反応終了後に残存した未反応のストロンチウム源あるいは第３成分Ｍが空気中の炭酸ガスと反応して、炭酸ストロンチウムなどの不純物を生成してしまうため、炭酸ストロンチウムなどの粒子が残存すると粒度分布が広くなる。また、表面に炭酸ストロンチウムなどの不純物が残存すると、疎水性を付与するための表面処理をする際に、不純物の影響で有機表面処理剤を均一に被覆することができない。したがって、アルカリ水溶液を添加した後、未反応のストロンチウム源あるいは第３成分Ｍを取り除くため酸処理を行う。
(Acid treatment)
In the production method of the present invention, the strontium titanate compound obtained by a normal pressure heating reaction is further acid-treated. When synthesizing strontium titanate by performing atmospheric pressure heating reaction, if the mixing ratio of titanium oxide source, strontium source and third component M exceeds 1.0 in terms of (Sr + M) / Ti molar ratio, the reaction is completed. The remaining unreacted strontium source or the third component M reacts with carbon dioxide in the air to generate impurities such as strontium carbonate. Therefore, when particles such as strontium carbonate remain, the particle size distribution becomes wide. In addition, when impurities such as strontium carbonate remain on the surface, the organic surface treatment agent cannot be uniformly coated due to the influence of the impurities during the surface treatment for imparting hydrophobicity. Therefore, after the alkaline aqueous solution is added, acid treatment is performed to remove the unreacted strontium source or the third component M.
酸処理では、塩酸を用いてｐＨ２．５〜７．０、より好ましくはｐＨ４．５〜６．０に調整することが好ましい。酸としては、塩酸の他に硝酸、酢酸等を酸処理に用いることができる。しかし、硫酸を用いると、水の溶解度が低い硫酸ストロンチウムが発生するので好ましくない。 In the acid treatment, it is preferable to adjust to pH 2.5 to 7.0, more preferably pH 4.5 to 6.0 using hydrochloric acid. As the acid, nitric acid, acetic acid and the like can be used for the acid treatment in addition to hydrochloric acid. However, use of sulfuric acid is not preferable because strontium sulfate having low water solubility is generated.
また、前記酸処理によりチタン酸ストロンチウムの（Ｓｒ＋Ｍ）／Ｔｉモル比を０．７０以上０．９０未満に調整し、粒子表面をＴｉＯ２ リッチにすることにより有機表面処理剤の被覆状態を大幅に改善することができ、かつ、トナーに帯電安定性や流動性を付与することができる。 Moreover, the (Sr + M) / Ti molar ratio of strontium titanate is adjusted to 0.70 or more and less than 0.90 by the acid treatment, and the coating state of the organic surface treatment agent is greatly increased by making the particle surface rich in TiO 2. The toner can be improved, and charging stability and fluidity can be imparted to the toner.
本発明のチタン酸ストロンチウム系微細粒子は、従来、外添剤として使用されているシリカや酸化チタンと同じように、帯電調整や環境安定性の改良のため、ＳｉＯ２ 、Ａｌ２ Ｏ３ 等の無機酸化物やチタンカップリング剤、シランカップリング剤、シリコーンオイル等の疎水化剤で表面被覆することができる。０．０２μｍ〜０．０６μｍの一次粒子径を持ち、球状粒子および立方体乃至直方体状粒子を含む平均円形度０．８０〜１．００のチタン酸ストロンチウム系微細粒子をトナーの外添剤として使用する場合には、水系中で疎水化剤を被覆したものが一段と分散性が良好であるので好ましい。 The strontium titanate-based fine particles of the present invention are made of SiO 2 , Al 2 O 3, etc. for the purpose of adjusting the charge and improving the environmental stability in the same manner as silica and titanium oxide, which are conventionally used as external additives. The surface can be coated with a hydrophobizing agent such as an inorganic oxide, a titanium coupling agent, a silane coupling agent, or silicone oil. Strontium titanate fine particles having a primary particle size of 0.02 μm to 0.06 μm and having an average circularity of 0.80 to 1.00 including spherical particles and cubic or rectangular parallelepiped particles are used as an external additive for the toner. In such a case, an aqueous system coated with a hydrophobizing agent is preferable because the dispersibility is even better.
本発明のチタン酸ストロンチウム系微細粒子は磁性一成分トナー、二成分トナーおよび非磁性一成分トナーのあらゆる静電記録方式で使用される。また粉砕法あるいは重合法で製造したトナーの外添剤としても使用できる。トナー用のバインダー樹脂としては、公知の合成樹脂および天然樹脂であれば如何なるものでも使用できる。具体的には、例えば、スチレン系樹脂、アクリル系樹脂、オレフィン系樹脂、ジエン系樹脂、ポリエステル系樹脂、ポリアミド系樹脂、エポキシ系樹脂、シリコーン系樹脂、フェノール系樹脂、石油樹脂およびウレタン系樹脂等が挙げられる。また、目的に応じて帯電調整剤や離型剤等の添加剤をバインダー中に添加したトナーでも良い。 The strontium titanate fine particles of the present invention are used in all electrostatic recording systems of magnetic one-component toner, two-component toner and non-magnetic one-component toner. It can also be used as an external additive for toners produced by pulverization or polymerization. As the binder resin for the toner, any known synthetic resin and natural resin can be used. Specifically, for example, styrene resin, acrylic resin, olefin resin, diene resin, polyester resin, polyamide resin, epoxy resin, silicone resin, phenol resin, petroleum resin, urethane resin, etc. Is mentioned. Further, a toner in which an additive such as a charge adjusting agent or a release agent is added to the binder according to the purpose may be used.
本発明のチタン酸ストロンチウム系微細粒子を含む外添剤は、トナーに０．３重量％〜５．０重量％で外添して使用することができ、必要に応じ電子写真の分野で使用されている公知の流動化剤、例えば、シリカ、酸化チタン、酸化アルミナ等の１種又は２種以上と併用しても良い。また、粒子径の異なる２種以上の本発明のチタン酸ストロンチウム系微細粒子を同時に使用しても良い。 The external additive containing fine strontium titanate particles of the present invention can be used by adding 0.3 to 5.0% by weight to the toner, and is used in the field of electrophotography as needed. It may be used in combination with one or more known fluidizing agents such as silica, titanium oxide, alumina oxide and the like. Two or more strontium titanate fine particles of the present invention having different particle diameters may be used at the same time.
［測定法］
チタン酸ストロンチウム系微細粒子の（Ｓｒ＋Ｍ）／Ｔｉモル比、粒子径および円形度等は、種々の方法で測定できるが、本願においては以下の方法で測定した。
[Measurement method]
The (Sr + M) / Ti molar ratio, particle diameter, circularity, etc. of the strontium titanate fine particles can be measured by various methods, but in the present application, they were measured by the following methods.
（（Ｓｒ＋Ｍ）／Ｔｉモル比の測定）
島津製作所製蛍光Ｘ線分析装置ＸＲＦ−１７００を用いて各元素のカウント値を測定し、Ｆｕｎｄａｍｅｎｔａｌ Ｐａｒａｍｅｔｅｒ法により算出した（ＪＩＳ Ｋ ０１１９：２００８）。
(Measurement of (Sr + M) / Ti molar ratio)
The count value of each element was measured using a fluorescent X-ray analyzer XRF-1700 manufactured by Shimadzu Corporation and calculated by the Fundamental Parameter method (JIS K 0119: 2008).
（平均一次粒子径）
平均一次粒子径は、日本電子製透過型電子顕微鏡ＪＥＭ−１４００ｐｌｕｓで撮影した写真から等価円直径により測定される重量基準の５０％粒子径であり、四分偏差は透過型電子顕微鏡写真から等価円直径により測定される重量基準の７５％粒子径と２５％粒子径の差の１／２で表される。
(Average primary particle size)
The average primary particle diameter is a weight-based 50% particle diameter measured by an equivalent circular diameter from a photograph taken with a transmission electron microscope JEM-1400plus manufactured by JEOL, and the quadrature deviation is an equivalent circle from a transmission electron microscope photograph. It is represented by 1/2 of the difference between the 75% particle size and the 25% particle size based on weight measured by the diameter.
（平均円形度）
円形度は、粒子を二次元に投影した時の円形度で評価し、（粒子面積と等しい円の周囲長）／（粒子周囲長）である。また、平均円形度は、チタン酸ストロンチウム系微細粒子２００個の円形度の平均値である。この円形度は、日本電子製透過型電子顕微鏡ＪＥＭ−１４００ｐｌｕｓで撮影した粒子像にて画像解析ソフトＩｍａｇｅＪを用いることにより測定した。
(Average circularity)
The degree of circularity is evaluated by the degree of circularity when the particles are projected two-dimensionally, and is (peripheral length of a circle equal to the particle area) / (peripheral length of particle). The average circularity is an average value of the circularity of 200 strontium titanate fine particles. This circularity was measured by using image analysis software ImageJ on a particle image taken with a JEM transmission electron microscope JEM-1400plus.
（比表面積）
比表面積は、ＭＩＣＲＯＭＥＴＯＲＩＣＳ ＩＮＳＴＲＵＭＥＮＴ ＣＯ．製ジェミニ２３７５を用い、ＢＥＴ法にて測定した。
(Specific surface area)
The specific surface area is measured by MICROMETORICS INSTRUMENT CO. It measured by BET method using Gemini 2375 made from.
（疎水化度）
本願明細書における「疎水化度」は、簡易で再現性のよい試験方法で求めたものであり、２．５重量％毎のメタノールを含む水溶液を試験管に用意しておき、少量の微粒子を投入し、沈降の有無を確認した。疎水化度としては、沈降が無い時の最大メタノール濃度比率の重量％を疎水化度（下限）値とし、粒子が沈降する最小メタノール濃度比率の重量％を疎水化度（上限）値として表示した。なお、疎水性とは疎水化度が少なくとも１０％以上のことをいう。
(Hydrophobicity)
The “hydrophobic degree” in the present specification is obtained by a simple and reproducible test method. An aqueous solution containing 2.5% by weight of methanol is prepared in a test tube, and a small amount of fine particles are added. Then, the presence or absence of sedimentation was confirmed. As the degree of hydrophobicity, the weight percentage of the maximum methanol concentration ratio when there is no sedimentation is indicated as the hydrophobicity degree (lower limit) value, and the weight percentage of the minimum methanol concentration ratio at which particles settle is indicated as the degree of hydrophobicity (upper limit) value. . Hydrophobic means that the degree of hydrophobicity is at least 10% or more.
（被着率）
被着率は、試料のカーボン含有量をＬＥＣＯ製ＣＳ−２３０炭素・硫黄分析装置を用いて分析し、当該測定値を有機表面処理剤が理論量被着したときのカーボン含有量で除した値を百分率で表した数値である。
(Deposition rate)
The deposition rate is a value obtained by analyzing the carbon content of the sample using a LECO CS-230 carbon / sulfur analyzer and dividing the measured value by the carbon content when the organic surface treatment agent is deposited in a theoretical amount. Is a numerical value expressed as a percentage.
以下に実施例を挙げて本発明を更に詳細に説明する。以下に挙げる例は単に例示のために記すものであり、本発明の範囲がこれによって制限されるものではない。
［実施例１］
硫酸法で得られたメタチタン酸を脱鉄漂白処理した後、水酸化ナトリウム水溶液を加えｐＨ９．０とし、脱硫処理を行い、その後、塩酸によりｐＨ５．８まで中和し、ろ過水洗を行って、洗浄済みケーキを得た。洗浄済みケーキに水を加え、ＴｉＯ２ として２．１３ｍｏｌ／Ｌのスラリーとした後、塩酸を加えｐＨ１．４とし、解膠処理を行った。このメタチタン酸をＴｉＯ２ として１．８７７ｍｏｌ採取し、３Ｌの反応容器に投入した。塩化ストロンチウム溶液をＴｉモル比で１．１５となるように２．１５９ｍｏｌ添加し、更に塩化ランタン溶液をＳｒモル比で１０ｍｏｌ％となる０．２１６ｍｏｌ添加した後、ＴｉＯ２ 濃度０．９３９ｍｏｌ／Ｌに調整した。次に、撹拌しながら９０℃に加温した後、１０Ｎ水酸化ナトリウム水溶液５５３ｍＬを１時間かけて添加し、その後、９５℃で１時間撹拌を続け反応を終了した。
Hereinafter, the present invention will be described in more detail with reference to examples. The following examples are given for illustration only and are not intended to limit the scope of the invention.
[Example 1]
After the metatitanic acid obtained by the sulfuric acid method is subjected to deiron bleaching treatment, an aqueous sodium hydroxide solution is added to adjust the pH to 9.0, the desulfurization treatment is performed, and then neutralized to pH 5.8 with hydrochloric acid, followed by washing with filtered water. A washed cake was obtained. Water was added to the washed cake to make a 2.13 mol / L slurry as TiO 2 , and hydrochloric acid was added to adjust the pH to 1.4, followed by peptization. 1.877 mol of this metatitanic acid was collected as TiO 2 and charged into a 3 L reaction vessel. 2.159 mol of a strontium chloride solution was added to a Ti molar ratio of 1.15, and 0.216 mol of a lanthanum chloride solution was added to a Sr molar ratio of 10 mol%, and then the TiO 2 concentration was adjusted to 0.939 mol / L. It was adjusted. Next, after heating to 90 ° C. with stirring, 553 mL of a 10N aqueous sodium hydroxide solution was added over 1 hour, and then stirring was continued at 95 ° C. for 1 hour to complete the reaction.
当該反応終了スラリーを５０℃まで冷却し、ｐＨ５．０となるまで塩酸を加え１時間撹拌を続けた。得られた沈殿をデカンテーション洗浄し、ろ過による分離後、１２０℃の大気中で１０時間乾燥して、粒子Ａを得た。粒子Ａの電子顕微鏡写真を図１に示す。粒子Ａを観察すると、球状および立方体乃至直方体状粒子を含む、一次粒子径０．０２μｍ〜０．０４μｍの粒子であった。電子顕微鏡写真を用いて重量基準で算出した平均一次粒子径は０．０３μｍ、四分偏差を平均一次粒子径で割った値は０．１３、また、平均円形度は０．８５であった。粒子Ａの蛍光Ｘ線分析による（Ｓｒ＋Ｌａ）／Ｔｉモル比は０．８８であった。粉末Ｘ線回折法で測定すると、チタン酸ストロンチウムの回折ピークが確認できた。 The reaction-terminated slurry was cooled to 50 ° C., hydrochloric acid was added until pH 5.0, and stirring was continued for 1 hour. The resulting precipitate was washed by decantation, separated by filtration, and dried in air at 120 ° C. for 10 hours to obtain particles A. An electron micrograph of the particle A is shown in FIG. When the particle A was observed, it was a particle having a primary particle size of 0.02 μm to 0.04 μm including spherical and cubic or rectangular parallelepiped particles. The average primary particle size calculated on the basis of weight using an electron micrograph was 0.03 μm, the value obtained by dividing the quadrant by the average primary particle size was 0.13, and the average circularity was 0.85. The (Sr + La) / Ti molar ratio of the particle A by fluorescent X-ray analysis was 0.88. When measured by a powder X-ray diffraction method, a diffraction peak of strontium titanate was confirmed.
［実施例２］
実施例１と同様にして脱硫処理及び解膠処理を行ったメタチタン酸をＴｉＯ２ として１．２５１ｍｏｌ採取し、３Ｌの反応容器に投入した。該解膠含水酸化チタンスラリーに、塩化ストロンチウム溶液をＴｉモル比で１．１５となるように１．４３９ｍｏｌ添加し、更に塩化ランタン溶液をＳｒモル比で１５ｍｏｌ％となる０．２１６ｍｏｌ添加した後、ＴｉＯ２ 濃度０．６２６ｍｏｌ／Ｌに調整した。次に、撹拌しながら９０℃に加温した後、１０Ｎ水酸化ナトリウム水溶液３７８ｍＬを４時間かけて添加し、その後、９５℃で１時間撹拌を続け反応を終了した。
[Example 2]
1. 251 mol of metatitanic acid that had been subjected to desulfurization treatment and peptization treatment in the same manner as in Example 1 was collected as TiO 2 and charged into a 3 L reaction vessel. 1.439 mol of strontium chloride solution was added to the peptized hydrous titanium oxide slurry at a Ti molar ratio of 1.15, and 0.216 mol of lanthanum chloride solution at 15 mol% of Sr molar ratio was added. The TiO 2 concentration was adjusted to 0.626 mol / L. Next, after heating to 90 ° C. with stirring, 378 mL of 10N aqueous sodium hydroxide solution was added over 4 hours, and then stirring was continued at 95 ° C. for 1 hour to complete the reaction.
当該反応終了スラリーを５０℃まで冷却し、ｐＨ５．０となるまで塩酸を加え１時間撹拌を続けた。得られた沈殿をデカンテーション洗浄し、ろ過による分離後、１２０℃の大気中で１０時間乾燥して、粒子Ｂを得た。粒子Ｂを観察すると、球状および立方体乃至直方体状粒子を含む、一次粒子径０．０４μｍ〜０．０６μｍの粒子であった。電子顕微鏡写真を用いて重量基準で算出した平均一次粒子径は０．０５μｍ、四分偏差を平均一次粒子径で割った値は０．１５、また、平均円形度は０．８０であった。粒子Ｂの蛍光Ｘ線分析による（Ｓｒ＋Ｌａ）／Ｔｉモル比は０．８９であった。粉末Ｘ線回折法で測定すると、チタン酸ストロンチウムの回折ピークが確認できた。 The reaction-terminated slurry was cooled to 50 ° C., hydrochloric acid was added until pH 5.0, and stirring was continued for 1 hour. The obtained precipitate was decanted and washed, separated by filtration, and dried in the atmosphere at 120 ° C. for 10 hours to obtain particles B. When the particles B were observed, they were particles having a primary particle diameter of 0.04 μm to 0.06 μm, including spherical and cubic or rectangular parallelepiped particles. The average primary particle diameter calculated on the basis of weight using an electron micrograph was 0.05 μm, the value obtained by dividing the quadrant deviation by the average primary particle diameter was 0.15, and the average circularity was 0.80. The (Sr + La) / Ti molar ratio of the particle B by X-ray fluorescence analysis was 0.89. When measured by a powder X-ray diffraction method, a diffraction peak of strontium titanate was confirmed.
［実施例３］
実施例１と同様にして脱硫処理及び解膠処理を行ったメタチタン酸をＴｉＯ２ として１．８７７ｍｏｌ採取し、３Ｌの反応容器に投入した。該解膠含水酸化チタンスラリーに、塩化ストロンチウム溶液をＴｉモル比で１．１０となるように２．０６５ｍｏｌ添加し、更に塩化カルシウムをＳｒモル比で５ｍｏｌ％となる０．１０３ｍｏｌ添加した後、ＴｉＯ２ 濃度０．９３９ｍｏｌ／Ｌに調整した。次に、撹拌しながら９０℃に加温した後、１０Ｎ水酸化ナトリウム水溶液５２６ｍＬを１時間かけて添加し、その後、９５℃で１時間撹拌を続け反応を終了した。
[Example 3]
1.877 mol of metatitanic acid that had been desulfurized and peptized as in Example 1 was collected as TiO 2 and charged into a 3 L reaction vessel. To the peptized hydrous titanium oxide slurry, 2.065 mol of a strontium chloride solution was added so that the molar ratio of Ti was 1.10, and further 0.103 mol of calcium chloride was added so that the molar ratio of Sr was 5 mol%. Two concentrations were adjusted to 0.939 mol / L. Next, after heating to 90 ° C. with stirring, 526 mL of 10N aqueous sodium hydroxide solution was added over 1 hour, and then stirring was continued at 95 ° C. for 1 hour to complete the reaction.
当該反応終了スラリーを５０℃まで冷却し、ｐＨ５．０となるまで塩酸を加え１時間撹拌を続けた。得られた沈殿をデカンテーション洗浄し、ろ過による分離後、１２０℃の大気中で１０時間乾燥して、粒子Ｃを得た。粒子Ｃを観察すると、球状および立方体乃至直方体状粒子を含む、一次粒子径０．０３μｍ〜０．０５μｍの粒子であった。電子顕微鏡写真を用いて重量基準で算出した平均一次粒子径は０．０４μｍ、四分偏差を平均一次粒子径で割った値は０．１８、また、平均円形度は０．８０であった。粒子Ｃの蛍光Ｘ線分析による（Ｓｒ＋Ｃａ）／Ｔｉモル比は０．７２であった。粉末Ｘ線回折法で測定すると、チタン酸ストロンチウムの回折ピークが確認できた。 The reaction-terminated slurry was cooled to 50 ° C., hydrochloric acid was added until pH 5.0, and stirring was continued for 1 hour. The resulting precipitate was washed by decantation, separated by filtration, and dried in air at 120 ° C. for 10 hours to obtain particles C. When the particles C were observed, they were particles having a primary particle diameter of 0.03 μm to 0.05 μm, including spherical and cubic or rectangular parallelepiped particles. The average primary particle diameter calculated on the basis of weight using an electron micrograph was 0.04 μm, the value obtained by dividing the quarter deviation by the average primary particle diameter was 0.18, and the average circularity was 0.80. The (Sr + Ca) / Ti molar ratio of the particle C by fluorescent X-ray analysis was 0.72. When measured by a powder X-ray diffraction method, a diffraction peak of strontium titanate was confirmed.
［実施例４］
実施例１と同様に脱硫処理及び解膠処理を行ったメタチタン酸をＴｉＯ２ として１．８７７ｍｏｌ採取し、３Ｌの反応容器に投入した。該解膠含水酸化チタンスラリーに、塩化ストロンチウム溶液をＴｉモル比で１．１５となるように２．１５９ｍｏｌ添加し、更に塩化マグネシウムをＳｒモル比で１０ｍｏｌ％となる０．２１６ｍｏｌ添加した後、ＴｉＯ２ 濃度０．９３９ｍｏｌ／Ｌに調整した。次に、撹拌しながら９０℃に加温した後、１０Ｎ水酸化ナトリウム水溶液５５３ｍＬを１時間かけて添加し、その後、９５℃で１時間撹拌を続け反応を終了した。
[Example 4]
1.877 mol of metatitanic acid subjected to desulfurization treatment and peptization treatment in the same manner as in Example 1 was collected as TiO 2 and charged into a 3 L reaction vessel. 2.159 mol of strontium chloride solution was added to the peptized hydrous titanium oxide slurry to a Ti molar ratio of 1.15, and 0.216 mol of magnesium chloride was further added to a Sr molar ratio of 10 mol%. Two concentrations were adjusted to 0.939 mol / L. Next, after heating to 90 ° C. with stirring, 553 mL of a 10N aqueous sodium hydroxide solution was added over 1 hour, and then stirring was continued at 95 ° C. for 1 hour to complete the reaction.
当該反応終了スラリーを５０℃まで冷却し、ｐＨ５．０となるまで塩酸を加え１時間撹拌を続けた。得られた沈殿をデカンテーション洗浄し、ろ過による分離後、１２０℃の大気中で１０時間乾燥して、粒子Ｄを得た。粒子Ｄを観察すると、球状および立方体乃至直方体状粒子を含む、一次粒子径０．０３μｍ〜０．０５μｍの粒子であった。電子顕微鏡写真を用いて重量基準で算出した平均一次粒子径は０．０４μｍ、四分偏差を平均一次粒子径で割った値は０．１４、また、平均円形度は０．９３であった。粒子Ｄの蛍光Ｘ線分析による（Ｓｒ＋Ｍｇ）／Ｔｉモル比は０．７２であった。粉末Ｘ線回折法で測定すると、チタン酸ストロンチウムの回折ピークが確認できた。 The reaction-terminated slurry was cooled to 50 ° C., hydrochloric acid was added until pH 5.0, and stirring was continued for 1 hour. The obtained precipitate was decanted and washed, separated by filtration, and dried in the atmosphere at 120 ° C. for 10 hours to obtain particles D. When the particle D was observed, it was a particle having a primary particle size of 0.03 μm to 0.05 μm, including spherical and cubic or rectangular parallelepiped particles. The average primary particle diameter calculated on the basis of weight using an electron micrograph was 0.04 μm, the value obtained by dividing the quadrant by the average primary particle diameter was 0.14, and the average circularity was 0.93. The (Sr + Mg) / Ti molar ratio of the particle D by fluorescent X-ray analysis was 0.72. When measured by a powder X-ray diffraction method, a diffraction peak of strontium titanate was confirmed.
［実施例５］
実施例１と同様に脱硫処理及び解膠を行ったメタチタン酸をＴｉＯ２ として１．８７７ｍｏｌ採取し、３Ｌの反応容器に投入した。該解膠含水酸化チタンスラリーに、塩化ストロンチウム溶液をＴｉモル比で１．１５となるように２．１５９ｍｏｌ添加し、更に塩化スズをＳｒモル比で１０ｍｏｌ％となる０．２１６ｍｏｌ添加した後、ＴｉＯ２ 濃度０．９３９ｍｏｌ／Ｌに調整した。次に、撹拌しながら８０℃に加温した後、１０Ｎ水酸化ナトリウム水溶液５５３ｍＬを１時間かけて添加し、その後、８０℃で１時間撹拌を続け反応を終了した。
[Example 5]
1.877 mol of metatitanic acid that had been desulfurized and peptized as in Example 1 was collected as TiO 2 and charged into a 3 L reaction vessel. To the peptized hydrous titanium oxide slurry, 2.159 mol of strontium chloride solution was added so that the molar ratio of Ti was 1.15, and further 0.216 mol of tin chloride was added so that the molar ratio of Sr was 10 mol%. Two concentrations were adjusted to 0.939 mol / L. Next, after heating to 80 ° C. with stirring, 553 mL of 10N aqueous sodium hydroxide solution was added over 1 hour, and then stirring was continued at 80 ° C. for 1 hour to complete the reaction.
当該反応終了スラリーを５０℃まで冷却し、ｐＨ５．０となるまで塩酸を加え１時間撹拌を続けた。得られた沈殿をデカンテーション洗浄し、ろ過による分離後、１２０℃の大気中で１０時間乾燥して、粒子Ｅを得た。粒子Ｅを観察すると、球状および立方体乃至直方体状粒子を含む、一次粒子径０．０３μｍ〜０．０５μｍの粒子であった。電子顕微鏡写真を用いて重量基準で算出した平均一次粒子径は０．０４μｍ、四分偏差を平均一次粒子径で割った値は０．１８、また、平均円形度は０．８６であった。粉末Ｅの蛍光Ｘ線分析による（Ｓｒ＋Ｓｎ）／Ｔｉモル比は０．８１であった。粉末Ｘ線回折法で測定すると、チタン酸ストロンチウムの回折ピークが確認できた。 The reaction-terminated slurry was cooled to 50 ° C., hydrochloric acid was added until pH 5.0, and stirring was continued for 1 hour. The obtained precipitate was washed by decantation, separated by filtration, and dried in air at 120 ° C. for 10 hours to obtain particles E. When the particle E was observed, it was a particle having a primary particle diameter of 0.03 μm to 0.05 μm, including spherical and cubic or rectangular parallelepiped particles. The average primary particle diameter calculated on the basis of weight using an electron micrograph was 0.04 μm, the value obtained by dividing the quadrant by the average primary particle diameter was 0.18, and the average circularity was 0.86. The (Sr + Sn) / Ti molar ratio of Powder E by fluorescent X-ray analysis was 0.81. When measured by a powder X-ray diffraction method, a diffraction peak of strontium titanate was confirmed.
［実施例６］
実施例１と同様に脱硫処理及び解膠処理を行ったメタチタン酸をＴｉＯ２ として１．８７７ｍｏｌ採取し、３Ｌの反応容器に投入した。該解膠含水酸化チタンスラリーに、塩化ストロンチウム溶液をＴｉモル比で１．２５となるように２．３４６ｍｏｌ添加し、更にケイ酸ナトリウムをＳｒモル比で５ｍｏｌ％となる０．１１７ｍｏｌ添加した後、ＴｉＯ２ 濃度０．９３９ｍｏｌ／Ｌに調整した。次に、撹拌しながら９０℃に加温した後、１０Ｎ水酸化ナトリウム水溶液５６４ｍＬを１時間かけて添加し、その後、９５℃で１時間撹拌を続け反応を終了した。
[Example 6]
1.877 mol of metatitanic acid subjected to desulfurization treatment and peptization treatment in the same manner as in Example 1 was collected as TiO 2 and charged into a 3 L reaction vessel. After adding 2.346 mol of the strontium chloride solution to a 1.25 molar ratio of Ti to the peptized hydrous titanium oxide slurry, 0.117 mol of sodium silicate having an Sr molar ratio of 5 mol% was added, The TiO 2 concentration was adjusted to 0.939 mol / L. Next, after heating to 90 ° C. with stirring, 564 mL of 10N aqueous sodium hydroxide solution was added over 1 hour, and then stirring was continued at 95 ° C. for 1 hour to complete the reaction.
当該反応終了スラリーを５０℃まで冷却し、ｐＨ５．０となるまで塩酸を加え１時間撹拌を続けた。得られた沈殿をデカンテーション洗浄し、ろ過による分離後、１２０℃の大気中で１０時間乾燥して、粒子Ｆを得た。粒子Ｆを観察すると、球状および立方体乃至直方体状粒子を含む、一次粒子径０．０３μｍ〜０．０５μｍの粒子であった。電子顕微鏡写真を用いて重量基準で算出した平均一次粒子径は０．０４μｍ、四分偏差を平均一次粒子径で割った値は０．１９、また、平均円形度は０．８２であった。粉末Ｆの蛍光Ｘ線分析による（Ｓｒ＋Ｓｉ）／Ｔｉモル比は０．８５であった。粉末Ｘ線回折法で測定すると、チタン酸ストロンチウムの回折ピークが確認できた。 The reaction-terminated slurry was cooled to 50 ° C., hydrochloric acid was added until pH 5.0, and stirring was continued for 1 hour. The obtained precipitate was decanted and washed, separated by filtration, and dried in air at 120 ° C. for 10 hours to obtain particles F. When the particles F were observed, they were particles having a primary particle diameter of 0.03 μm to 0.05 μm, including spherical and cubic or rectangular parallelepiped particles. The average primary particle size calculated on the basis of weight using an electron micrograph was 0.04 μm, the value obtained by dividing the quadrant by the average primary particle size was 0.19, and the average circularity was 0.82. The (Sr + Si) / Ti molar ratio of the powder F by fluorescent X-ray analysis was 0.85. When measured by a powder X-ray diffraction method, a diffraction peak of strontium titanate was confirmed.
［実施例７］
実施例１において、合成反応終了後の反応スラリーを酸処理して得られた沈殿をデカンテーションした後、ろ過による分離の前に、当該沈殿を含むスラリーを５０℃に調整し、および塩酸を加えｐＨ２．５に調整した後、固形分に対して１３．０ｗｔ％のｎ−プロピルトリエトキシシラン（表面処理剤）を添加して２０時間撹拌保持を続けた。次いで、水酸化ナトリウム溶液を加えｐＨ６．５に調整し、１時間撹拌保持を続けた後、ろ過洗浄を行い得られたケーキを１２０℃大気中で１０時間乾燥し、疎水性微粒子Ａ−１を得た。粒子Ａ−１の（Ｓｒ＋Ｌａ）／Ｔｉモル比は０．８６、また、疎水化度は４５．０％〜４７．５％であった。表面処理剤の被着率は９０％であった。
[Example 7]
In Example 1, after decanting the precipitate obtained by acid treatment of the reaction slurry after completion of the synthesis reaction, the slurry containing the precipitate is adjusted to 50 ° C. and added with hydrochloric acid before separation by filtration. After adjusting the pH to 2.5, 13.0 wt% of n-propyltriethoxysilane (surface treatment agent) was added to the solid content, and stirring was maintained for 20 hours. Next, sodium hydroxide solution was added to adjust the pH to 6.5, and after stirring and holding for 1 hour, the cake obtained by filtration and washing was dried in the atmosphere at 120 ° C. for 10 hours to obtain hydrophobic fine particles A-1. Obtained. Particle A-1 had a (Sr + La) / Ti molar ratio of 0.86 and a degree of hydrophobicity of 45.0% to 47.5%. The deposition rate of the surface treatment agent was 90%.
［実施例８］
実施例１において、合成反応終了後の反応スラリーを酸処理して得られた沈殿をデカンテーションした後、ろ過による分離の前に、当該沈殿を含むスラリーを５０℃に調整し、および塩酸を加えｐＨ２．５に調整した後、固形分に対して１０．０ｗｔ％のｉ−ブチルトリメトキシシラン（表面処理剤）を添加して６時間撹拌保持を続けた後、３．０ｗｔ％のトリフルオロプロピルトリメトキシシラン（表面処理剤）を添加して１４時間撹拌保持を続けた。次いで、水酸化ナトリウム溶液を加えｐＨ６．５に調整し、１時間撹拌保持を続けた後、ろ過洗浄を行い得られたケーキを１２０℃大気中で１０時間乾燥し、疎水性微粒子Ａ−２を得た。粒子Ａ−２の（Ｓｒ＋Ｌａ）／Ｔｉモル比は０．８５、また、疎水化度は５０．０％〜５２．５％であった。表面処理剤の被着率は８９％であった。
[Example 8]
In Example 1, after decanting the precipitate obtained by acid treatment of the reaction slurry after completion of the synthesis reaction, the slurry containing the precipitate is adjusted to 50 ° C. and added with hydrochloric acid before separation by filtration. After adjusting the pH to 2.5, 10.0 wt% of i-butyltrimethoxysilane (surface treatment agent) was added to the solid content and kept stirring for 6 hours, then 3.0 wt% of trifluoropropyl Trimethoxysilane (surface treatment agent) was added and stirring was continued for 14 hours. Next, sodium hydroxide solution was added to adjust the pH to 6.5, and after stirring and holding for 1 hour, the cake obtained by filtration and washing was dried in the atmosphere at 120 ° C. for 10 hours to obtain hydrophobic fine particles A-2. Obtained. Particle A-2 had a (Sr + La) / Ti molar ratio of 0.85 and a degree of hydrophobicity of 50.0% to 52.5%. The deposition rate of the surface treatment agent was 89%.
［実施例９］
実施例５において、合成反応終了後の反応スラリーを酸処理して得られた沈殿をデカンテーションした後、ろ過による分離の前に、当該沈殿を含むスラリーを７０℃に調整し、固形分に対して７．０ｗｔ％のステアリン酸ナトリウム（表面処理剤）を添加して２時間撹拌保持を続けた後、塩酸を加えてｐＨ６．５に調整し、１時間撹拌保持を続けた。次いで、ろ過・洗浄を行い得られたケーキを１２０℃大気中で１０時間乾燥し、疎水性微粒子Ｅ−１を得た。粒子Ｅ−１の（Ｓｒ＋Ｓｎ）／Ｔｉモル比は０．８１、また、疎水化度は６５．０％〜６７．５％であった。表面処理剤の被着率は９６％であった。
[Example 9]
In Example 5, the precipitate obtained by acid treatment of the reaction slurry after completion of the synthesis reaction was decanted, and then the slurry containing the precipitate was adjusted to 70 ° C. before separation by filtration. 7.0 wt% sodium stearate (surface treatment agent) was added and stirring was continued for 2 hours, hydrochloric acid was added to adjust the pH to 6.5, and stirring was continued for 1 hour. Next, the cake obtained by filtration and washing was dried in the atmosphere at 120 ° C. for 10 hours to obtain hydrophobic fine particles E-1. Particle E-1 had a (Sr + Sn) / Ti molar ratio of 0.81 and a degree of hydrophobicity of 65.0% to 67.5%. The deposition rate of the surface treatment agent was 96%.
［実施例１０］
実施例６において、合成反応終了後の反応スラリーを酸処理して得られた沈殿をデカンテーションした後、ろ過による分離の前に、当該沈殿を含むスラリーに塩酸を加えｐＨ６．５に調整した後、固形分に対して０．３ｗｔ％のシリコーンオイル（表面処理剤）を添加して１時間撹拌保持を続けた。次いで、ろ過洗浄を行い得られたケーキを１２０℃大気中で１０時間乾燥し、疎水性微粒子Ｆ−１を得た。粒子Ｆ−１の（Ｓｒ＋Ｓｉ）／Ｔｉモル比は０．８５であった。また、粒子Ｆ−１は疎水化度試験において水に浮遊せず疎水化度は０％であった。表面処理剤の被着率は９９％であった。
[Example 10]
In Example 6, the precipitate obtained by acid treatment of the reaction slurry after completion of the synthesis reaction was decanted and then adjusted to pH 6.5 by adding hydrochloric acid to the slurry containing the precipitate before separation by filtration. Then, 0.3 wt% silicone oil (surface treatment agent) was added to the solid content, and stirring was continued for 1 hour. Next, the cake obtained by filtration and washing was dried in the atmosphere at 120 ° C. for 10 hours to obtain hydrophobic fine particles F-1. The (Sr + Si) / Ti molar ratio of the particles F-1 was 0.85. Further, the particle F-1 did not float in water in the hydrophobicity test, and the hydrophobicity was 0%. The deposition rate of the surface treatment agent was 99%.
［比較例１］
実施例１において、第３成分（Ｌａ）を添加せずに、メタチタン酸と塩化ストロンチウムの混合溶液をＴｉＯ２濃度０．９３９ｍｏｌ／Ｌに調整した後、撹拌しながら９０℃に加温し、１０Ｎの水酸化ナトリウム水溶液４４４ｍＬを１時間かけて添加し、その後９５℃で１時間撹拌を続け反応を終了した。次いで、５０℃まで冷却し、ｐＨ５．０となるまで塩酸を加え、１時間撹拌保持を続けた。得られた沈殿をデカンテーション洗浄し、ろ過による分離後、１２０℃の大気中で１０時間乾燥して粒子Ｇを得た。粒子Ｇの電子顕微鏡写真を図２に示す。粒子Ｇを観察すると、立方体乃至直方体状粒子で、一次粒子径０．０２μｍ〜０．０４μｍの粒子であった。電子顕微鏡写真を用いて重量基準で算出した平均一次粒子径は０．０３μｍ、四分偏差を平均一次粒子径で割った値は０．１４、また、平均円形度は０．７８であった。粒子Ｇの蛍光Ｘ線分析によるＳｒ／Ｔｉモル比は０．８８であった。粉末Ｘ線回折法で測定すると、チタン酸ストロンチウムの回折ピークが確認できた。
[Comparative Example 1]
In Example 1, a mixed solution of metatitanic acid and strontium chloride was adjusted to a TiO 2 concentration of 0.939 mol / L without adding the third component (La), and then heated to 90 ° C. with stirring, and 10 N 444 mL of sodium hydroxide aqueous solution was added over 1 hour, followed by stirring at 95 ° C. for 1 hour to complete the reaction. Subsequently, it cooled to 50 degreeC, hydrochloric acid was added until it became pH 5.0, and stirring stirring was continued for 1 hour. The obtained precipitate was decanted and washed, separated by filtration, and dried in air at 120 ° C. for 10 hours to obtain particles G. An electron micrograph of the particle G is shown in FIG. When the particles G were observed, the particles were cubic or rectangular parallelepiped particles having a primary particle diameter of 0.02 μm to 0.04 μm. The average primary particle diameter calculated on the basis of weight using an electron micrograph was 0.03 μm, the value obtained by dividing the quarter deviation by the average primary particle diameter was 0.14, and the average circularity was 0.78. The Sr / Ti molar ratio of the particle G measured by fluorescent X-ray analysis was 0.88. When measured by a powder X-ray diffraction method, a diffraction peak of strontium titanate was confirmed.
［比較例２］
実施例１と同様に脱硫処理及び解膠処理を行ったメタチタン酸をＴｉＯ２ として０．６２６ｍｏｌ採取し、３Ｌの反応容器に投入した。該解膠含水酸化チタンスラリーに、塩化ストロンチウム溶液をＴｉモル比で１．１５となるように０．７１９ｍｏｌ添加し、更に塩化ランタン溶液をＳｒモル比で１０ｍｏｌ％となる０．０７２ｍｏｌ添加した後、ＴｉＯ２ 濃度０．３１３ｍｏｌ／Ｌに調整した。次に、撹拌しながら９０℃に加温した後、５Ｎ水酸化ナトリウム水溶液１８４ｍＬを１８時間かけて添加し、その後、９５℃で１時間撹拌を続け反応を終了した。
[Comparative Example 2]
0.626 mol of metatitanic acid that had been subjected to desulfurization treatment and peptization treatment in the same manner as in Example 1 was collected as TiO 2 and charged into a 3 L reaction vessel. After adding 0.719 mol of the strontium chloride solution to the Ti molar ratio of 1.15 to the peptized hydrous titanium oxide slurry, and further adding 0.072 mol of the lanthanum chloride solution to 10 mol% of the Sr molar ratio, The TiO 2 concentration was adjusted to 0.313 mol / L. Next, after heating to 90 ° C. with stirring, 184 mL of 5N aqueous sodium hydroxide solution was added over 18 hours, and then stirring was continued at 95 ° C. for 1 hour to complete the reaction.
当該反応終了スラリーを５０℃まで冷却し、ｐＨ５．０となるまで塩酸を加え、１時間撹拌を続けた。得られた沈殿をデカンテーション洗浄し、ろ過による分離後、１２０℃の大気中で１０時間乾燥して、粒子Ｈを得た。粒子Ｈを観察すると、立方体乃至直方体状粒子を含む、一次粒子径０．０８μｍ〜０．１２μｍの粒子であった。電子顕微鏡写真を用いて重量基準で算出した平均一次粒子径は０．１１μｍ、四分偏差を平均一次粒子径で割った値は０．１７、また、平均円形度は０．７７であった。粒子末Ｈの蛍光Ｘ線分析による（Ｓｒ＋Ｌａ）／Ｔｉモル比は０．９０であった。粉末Ｘ線回折法で測定すると、チタン酸ストロンチウムの回折ピークが確認できた。 The reaction-terminated slurry was cooled to 50 ° C., hydrochloric acid was added until pH 5.0, and stirring was continued for 1 hour. The obtained precipitate was decanted and washed, separated by filtration, and dried in the atmosphere at 120 ° C. for 10 hours to obtain particles H. When the particles H were observed, they were particles having a primary particle diameter of 0.08 μm to 0.12 μm including cubic or rectangular parallelepiped particles. The average primary particle diameter calculated on the basis of weight using an electron micrograph was 0.11 μm, the value obtained by dividing the quadrant by the average primary particle diameter was 0.17, and the average circularity was 0.77. The (Sr + La) / Ti molar ratio of the particle powder H was 0.90 by X-ray fluorescence analysis. When measured by a powder X-ray diffraction method, a diffraction peak of strontium titanate was confirmed.
［比較例３］
実施例１と同様に脱硫処理及び解膠処理を行ったメタチタン酸をＴｉＯ２ として１．８７７ｍｏｌ採取し、３Ｌの反応容器に投入した。該解膠含水酸化チタンスラリーに、塩化ストロンチウム溶液をＴｉモル比で０．８０となるように１．５０２ｍｏｌ添加し、更に塩化ランタン溶液をＳｒモル比で１０ｍｏｌ％となる０．１５０ｍｏｌ添加した後、ＴｉＯ２ 濃度０．９３９ｍｏｌ／Ｌに調整した。次に、撹拌しながら９０℃に加温した後、１０Ｎ水酸化ナトリウム水溶液４５９ｍＬを１時間かけて添加し、その後、９５℃で１時間撹拌を続け反応を終了した。
[Comparative Example 3]
1.877 mol of metatitanic acid subjected to desulfurization treatment and peptization treatment in the same manner as in Example 1 was collected as TiO 2 and charged into a 3 L reaction vessel. After adding 1.502 mol of the strontium chloride solution to the Ti molar ratio of 0.80 to the peptized hydrous titanium oxide slurry, and further adding 0.150 mol of the lanthanum chloride solution to 10 mol% of the Sr molar ratio, The TiO 2 concentration was adjusted to 0.939 mol / L. Next, after heating to 90 ° C. with stirring, 459 mL of a 10N aqueous sodium hydroxide solution was added over 1 hour, and then stirring was continued at 95 ° C. for 1 hour to complete the reaction.
当該反応終了スラリーを５０℃まで冷却し、ｐＨ５．０となるまで塩酸を加え、１時間撹拌を続けた。得られた沈殿をデカンテーション洗浄し、ろ過による分離後、１２０℃の大気中で１０時間乾燥して、粒子Ｉを得た。粒子Ｉを観察すると、球状および立方体乃至直方体状粒子を含む、一次粒子径０．０２μｍ〜０．０４μｍの粒子であった。電子顕微鏡写真を用いて重量基準で算出した平均一次粒子径は０．０３μｍ、四分偏差を平均一次粒子径で割った値は０．２０、また、平均円形度は０．８０であった。粉末Ｉの蛍光Ｘ線分析による（Ｓｒ＋Ｌａ）／Ｔｉモル比は０．６８であった。粉末Ｘ線回折法で測定すると、チタン酸ストロンチウムおよびアナターゼ型酸化チタンの回折ピークが確認できた。 The reaction-terminated slurry was cooled to 50 ° C., hydrochloric acid was added until pH 5.0, and stirring was continued for 1 hour. The obtained precipitate was washed by decantation, separated by filtration, and dried in air at 120 ° C. for 10 hours to obtain particles I. When the particles I were observed, they were particles having a primary particle diameter of 0.02 μm to 0.04 μm, including spherical and cubic or rectangular parallelepiped particles. The average primary particle size calculated on the basis of weight using an electron micrograph was 0.03 μm, the value obtained by dividing the quadrant by the average primary particle size was 0.20, and the average circularity was 0.80. The (Sr + La) / Ti molar ratio of Powder I was 0.68 by X-ray fluorescence analysis. When measured by a powder X-ray diffraction method, diffraction peaks of strontium titanate and anatase-type titanium oxide were confirmed.
［比較例４］
実施例１と同様に脱硫処理及び解膠処理を行ったメタチタン酸をＴｉＯ２ として１．８７７ｍｏｌ採取し、３Ｌの反応容器に投入した。該解膠含水酸化チタンスラリーに、塩化ストロンチウム溶液をＴｉモル比で１．１５となるように２．１５９ｍｏｌ添加し、更に塩化ランタン溶液をＳｒモル比で１０ｍｏｌ％となる０．２１６ｍｏｌ添加した後、ＴｉＯ２ 濃度０．９３９ｍｏｌ／Ｌに調整した。次に、撹拌しながら６０℃に加温した後、１０Ｎ水酸化ナトリウム水溶液５５３ｍＬを１時間かけて添加し、その後、６０℃で１時間撹拌を続け反応を終了した。
[Comparative Example 4]
1.877 mol of metatitanic acid subjected to desulfurization treatment and peptization treatment in the same manner as in Example 1 was collected as TiO 2 and charged into a 3 L reaction vessel. After adding 2.159 mol of the strontium chloride solution to a Ti molar ratio of 1.15, and further adding 0.216 mol of a lanthanum chloride solution to an Sr molar ratio of 10 mol% to the peptized hydrous titanium oxide slurry, The TiO 2 concentration was adjusted to 0.939 mol / L. Next, after heating to 60 ° C. with stirring, 553 mL of 10N aqueous sodium hydroxide solution was added over 1 hour, and then stirring was continued at 60 ° C. for 1 hour to complete the reaction.
当該反応終了スラリーを５０℃まで冷却し、ｐＨ５．０となるまで塩酸を加え、１時間撹拌を続けた。得られた沈殿をデカンテーション洗浄し、ろ過・分離後、１２０℃の大気中で１０時間乾燥して、粒子Ｊを得た。粒子Ｊを観察すると、球状および立方体／直方体状粒子を含む、一次粒子径０．０２μｍ〜０．０５μｍの粒子であった。電子顕微鏡写真を用いて重量基準で算出した平均一次粒子径は０．０４μｍ、四分偏差を平均一次粒子径で割った値は０．１９、また、平均円形度は０．７８であった。粉末Ｊの蛍光Ｘ線分析による（Ｓｒ＋Ｌａ）／Ｔｉモル比は０．６５であった。粉末Ｘ線回折法で測定すると、チタン酸ストロンチウムおよびアナターゼ型酸化チタンの回折ピークが確認できた。 The reaction-terminated slurry was cooled to 50 ° C., hydrochloric acid was added until pH 5.0, and stirring was continued for 1 hour. The obtained precipitate was decanted and washed, filtered and separated, and dried in the atmosphere at 120 ° C. for 10 hours to obtain particles J. When the particles J were observed, they were particles having a primary particle diameter of 0.02 μm to 0.05 μm, including spherical and cubic / cuboid particles. The average primary particle diameter calculated on the weight basis using an electron micrograph was 0.04 μm, the value obtained by dividing the quadrant by the average primary particle diameter was 0.19, and the average circularity was 0.78. The (Sr + La) / Ti molar ratio of powder J was 0.65 by X-ray fluorescence analysis. When measured by a powder X-ray diffraction method, diffraction peaks of strontium titanate and anatase-type titanium oxide were confirmed.
［比較例５］
実施例１と同様に脱硫処理及び解膠処理を行ったメタチタン酸をＴｉＯ２ として１．８７７ｍｏｌ採取し、３Ｌの反応容器に投入した。該解膠含水酸化チタンスラリーに、塩化ストロンチウム溶液をＴｉモル比で１．１５となるように２．１５９ｍｏｌ添加し、更に塩化ランタン溶液をＳｒモル比で１０ｍｏｌ％となる０．２１６ｍｏｌ添加した後、ＴｉＯ２ 濃度０．９３９ｍｏｌ／Ｌに調整した。次に、撹拌しながら９０℃に加温した後、１０Ｎ水酸化ナトリウム水溶液５５３ｍＬを１時間かけて添加した。その後、９５℃で１時間撹拌を続け反応を終了した後に、酸処理せず、そのまま得られた沈殿をデカンテーション洗浄し、ろ過分離後、１２０℃の大気中で１０時間乾燥して、粒子Ｋを得た。粒子Ｋを観察すると、球状および立方体乃至直方体状粒子を含む、一次粒子径０．０２μｍ〜０．０４μｍの粒子であった。電子顕微鏡写真を用いて重量基準で算出した平均一次粒子径は０．０３μｍ、四分偏差を平均一次粒子径で割った値は０．２３、また、平均円形度は０．８５であった。粉末Ｋの蛍光Ｘ線分析による（Ｓｒ＋Ｌａ）／Ｔｉモル比は１．０９であり、粉末Ｘ線回折法はチタン酸ストロンチウムの回折ピークが確認できた。
[Comparative Example 5]
1.877 mol of metatitanic acid subjected to desulfurization treatment and peptization treatment in the same manner as in Example 1 was collected as TiO 2 and charged into a 3 L reaction vessel. After adding 2.159 mol of the strontium chloride solution to a Ti molar ratio of 1.15, and further adding 0.216 mol of a lanthanum chloride solution to an Sr molar ratio of 10 mol% to the peptized hydrous titanium oxide slurry, The TiO 2 concentration was adjusted to 0.939 mol / L. Next, after heating to 90 ° C. with stirring, 553 mL of 10N aqueous sodium hydroxide solution was added over 1 hour. Thereafter, stirring was continued at 95 ° C. for 1 hour to complete the reaction, and then the acid treatment was not carried out, and the resulting precipitate was decanted and washed, separated by filtration, and dried in the atmosphere at 120 ° C. for 10 hours. Got. When the particles K were observed, they were particles having a primary particle diameter of 0.02 μm to 0.04 μm, including spherical and cubic or rectangular parallelepiped particles. The average primary particle diameter calculated on the weight basis using an electron micrograph was 0.03 μm, the value obtained by dividing the quadrant by the average primary particle diameter was 0.23, and the average circularity was 0.85. The (Sr + La) / Ti molar ratio of powder K by fluorescent X-ray analysis was 1.09, and the powder X-ray diffraction method confirmed the diffraction peak of strontium titanate.
［比較例６］
比較例５において、合成反応終了後に洗浄操作が終了したスラリーを５０℃に調整し、および塩酸を加えｐＨ２．５に調整した後、固形分に対して１０．０ｗｔ％のｉ−ブチルトリメトキシシラン（表面処理剤）を添加して６時間撹拌保持を続けた後、３．０ｗｔ％のトリフルオロプロピルトリメトキシシラン（表面処理剤）を添加して１４時間撹拌保持を続けた。次いで、水酸化ナトリウム溶液を加えｐＨ６．５に調整し、１時間撹拌保持を続けた後、ろ過洗浄を行い得られたケーキを１２０℃大気中で１０時間乾燥し、疎水性微粒子Ｋ−１を得た。粒子Ｋ−１の（Ｓｒ＋Ｌａ）／Ｔｉモル比は０．９１、疎水化度は１７．５％〜２０．０％であった。表面処理剤の被着率は３６％であった。
[Comparative Example 6]
In Comparative Example 5, the slurry after the completion of the synthesis reaction was adjusted to 50 ° C. and adjusted to pH 2.5 by adding hydrochloric acid, and then 10.0 wt% i-butyltrimethoxysilane with respect to the solid content. (Surface treatment agent) was added and kept stirring for 6 hours, and then 3.0 wt% trifluoropropyltrimethoxysilane (surface treatment agent) was added and kept stirring for 14 hours. Next, a sodium hydroxide solution was added to adjust the pH to 6.5, and stirring and holding were continued for 1 hour, followed by filtration and washing. The resulting cake was dried in the atmosphere at 120 ° C. for 10 hours to obtain hydrophobic fine particles K-1. Obtained. Particles K-1 had a (Sr + La) / Ti molar ratio of 0.91 and a degree of hydrophobicity of 17.5% to 20.0%. The deposition rate of the surface treatment agent was 36%.
常圧加熱反応法の反応条件において第３成分を添加することにより、平均一次粒径が０．０２μｍ〜０．０６μｍ、および平均円形度０．８０〜０．１０のチタン酸ストロンチウム系微細粒子が得られ、更に酸を用いた溶解操作により（Ｓｒ＋Ｍ）／Ｔｉモル比を調整することにより、シランカップリング剤、ステアリン酸ナトリウム、シリコーンオイル等の有機表面処理剤の被着が容易となり、疎水化度および被着率が向上していることが分かる。 By adding the third component under the reaction conditions of the atmospheric pressure heating reaction method, strontium titanate fine particles having an average primary particle size of 0.02 μm to 0.06 μm and an average circularity of 0.80 to 0.10 are obtained. Further, by adjusting the (Sr + M) / Ti molar ratio by a dissolving operation using an acid, it becomes easy to deposit an organic surface treatment agent such as a silane coupling agent, sodium stearate, silicone oil, etc. It can be seen that the degree and the deposition rate are improved.
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