JP5622142B2 - 無機粒子含有エマルション及び無機粒子含有エマルションを用いた粒子の製造方法 - Google Patents
無機粒子含有エマルション及び無機粒子含有エマルションを用いた粒子の製造方法 Download PDFInfo
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Description
本発明に係る無機粒子含有エマルションは、懸濁安定化剤としてカーボンブラックを含有した油相液と、無機粒子及び寒天を含有した水相液とを混合撹拌して得られるW/O型エマルションである。なお、W/O型エマルションは、連続相が油相であり、分散相が水相である。
本発明に係る粒子の製造方法は、上述の無機粒子含有エマルションを、微細貫通孔を通過処理してエマルション粒子を所望の大きさに整粒し、整粒したエマルション粒子を冷却して無機粒子含有ゲル粒子とし、この無機粒子含有ゲル粒子を分離採取、洗浄、乾燥処理して複数の無機粒子と寒天とを含む粒子を得る粒子の製造方法であって、以下に示す工程を経る。
工程b:整粒化後の無機粒子含有エマルションを冷却して前記エマルション粒子をゲル化させて無機粒子含有ゲル粒子とし、無機粒子含有ゲル粒子と懸濁安定化剤としてのカーボンブラックを含有する油相液との懸濁液とする。
工程c:懸濁安定化剤としてのカーボンブラックを含有する油相液を除去することにより前記無機粒子含有ゲル粒子を分離採取し、洗浄して脱媒する。
工程d:脱媒した前記無機粒子含有ゲル粒子を、脱水乾燥処理により乾燥させて複数の無機粒子と寒天とを含む粒子を得る。
40Lのビーズミルに水25Lを投入し、酸化鉄(III)15.55kg、四三酸化マンガン8.90kg、水酸化マグネシウム0.57kg、炭酸ストロンチウム0.72kg、及び分散剤として固形分40%のポリカルボン酸型高分子界面活性剤を275g添加し、2時間撹拌して、混合した。こうして得られた水系スラリーを217g採取し、これに水108gを加えて固形分を33.5%とし、更に、粉末寒天(伊那食品工業株式会社製、UP−37)7.5gを添加し、ホモジナイザーを用いて5000rpmで3分間撹拌して混合した。
室温(23℃)における粘度が100cpの合成植物油(日清オイリオグループ株式会社製 サラダ油)600mlをビーカーにとり、懸濁安定化剤としてカーボンブラック(キャボット・スペシャルティ・ケミカルズ・インク社製 MOGUL−L)を18g(サラダ油重量100wt%として約3wt%)添加し、ホモジナイザーで3分間分散した後、加熱して90℃にした。このときの油相液の粘度は100cpに調整した。
前記水相液を90℃に維持しつつ、1Lビーカー撹拌用フルゾーン翼で撹拌し、この水相液中に、注射器で前記油相液600ml分をゆっくり滴下した。この際、滴下した油相液が、水相液に常にムラ無く分散した状態となるように、撹拌機の回転数を制御して、無機粒子含有エマルションを得た。
加圧可能なシリンダ(容積500ml、内径42mm)を用意し、このシリンダ内部を第一室と第二室とに仕切る内壁として、微細な貫通孔を備えたフィルタを取り付けた。このフィルタは、ステンレス製で、厚さ方向に貫通する円形の微細孔を複数備えるもので、開口径が40μm、開口間のピッチが150μm、厚さが100μmとした。
Claims (10)
- 無機粒子と寒天とを含む粒子を得るために、油相液と、当該無機粒子を含む水相液とを混合撹拌して得られる油中水型エマルションであって、
前記水相液には、比重1.5g/cm3〜11g/cm3の無機粒子と、
前記水相液に含有する水分量を100wt%としたときに、0.5wt%〜5wt%の寒天とを含有し、
前記油相液には、懸濁安定化剤としてカーボンブラックを含有し、
前記水相液を油中水型エマルションの分散相として、前記無機粒子を分散させたことを特徴とする無機粒子含有エマルション。 - 前記水相液が、複数の無機粒子と寒天とを含有する整粒したエマルション粒子として分散したものであることを特徴とする請求項1に記載の無機粒子含有エマルション。
- 前記カーボンブラックは、BET比表面積が200m2/g以下、且つ、吸油量が100ml/g以下であり、前記油相液の油の重量を100wt%としたときに0.5wt%〜10wt%添加したものである請求項1又は請求項2に記載の無機粒子含有エマルション。
- 前記水相液を撹拌しながら前記油相液を徐々に添加することにより、水中油型エマルションから油中水型エマルションに転相乳化して得られる請求項1〜請求項3のいずれかに記載の無機粒子含有エマルション。
- 前記無機粒子は、1種又は2種以上の無機粒子であり、且つ、平均粒径が0.01μm〜5μmである請求項1〜請求項4のいずれかに記載の無機粒子含有エマルション。
- 請求項1〜請求項5のいずれかに記載の無機粒子含有エマルションを用いて、複数の無機粒子と寒天とを含む粒子を得る粒子の製造方法であって、
前記無機粒子含有エマルションを一定圧力下で微細孔を通過させることにより、前記無機粒子含有エマルションのエマルション粒子を整粒化し、
整粒化後の無機粒子含有エマルションを冷却して前記エマルション粒子をゲル化させて無機粒子含有ゲル粒子と、懸濁安定化剤としてカーボンブラックを含有した油相液との懸濁液とし、
前記油相液を除去することにより前記無機粒子含有ゲル粒子を分離採取し、これを洗浄し、脱水乾燥処理して複数の無機粒子と寒天とを含む粒子を得ることを特徴とする粒子の製造方法。 - 前記無機粒子含有ゲル粒子を分離採取する際、前記懸濁液に親油性有機溶媒を添加して撹拌することにより、前記無機粒子含有ゲル粒子の沈降を促進させて、前記油相液から無機粒子含有ゲル粒子を分離採取する請求項6に記載の粒子の製造方法。
- 前記親油性有機溶媒は、トルエン、ヘキサン、メチルエチルケトンのいずれかである請求項7に記載の粒子の製造方法。
- 前記脱水乾燥処理は、メタノール、エタノール、プロパノールから選ばれるアルコールに、洗浄後の前記無機粒子含有ゲル粒子を分散させてゲル粒子分散スラリーとし、前記アルコールにより前記無機粒子含有ゲル粒子から水分を除去し、
前記ゲル粒子分散スラリーを固液分離して、水分が除去された脱水粒子を採取し、
前記脱水粒子を空気乾燥によりアルコールを除去して複数の無機粒子と寒天とを含む粒子を得る請求項6〜請求項8のいずれかに記載の粒子の製造方法。 - 微細孔を通過させる前記無機粒子含有エマルションに含まれる固形分量が、無機粒子含有エマルションを100wt%とした場合に5wt%〜30wt%である請求項6〜請求項9のいずれかに記載の粒子の製造方法。
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JP2008247708A (ja) * | 2007-03-30 | 2008-10-16 | Hiroshima Univ | 無機粒子分散エマルション |
JP5522446B2 (ja) * | 2010-01-28 | 2014-06-18 | パウダーテック株式会社 | 電子写真現像剤用フェライトキャリア芯材、フェライトキャリア及び該フェライトキャリアを用いた電子写真現像剤 |
JP5488910B2 (ja) | 2010-06-30 | 2014-05-14 | パウダーテック株式会社 | 電子写真現像剤用フェライトキャリア芯材及びフェライトキャリア、並びに該フェライトキャリアを用いた電子写真現像剤 |
FR2965807B1 (fr) * | 2010-10-11 | 2012-12-21 | Centre Nat Rech Scient | Procede de preparation de materiaux monolithiques inorganiques alveolaires et utilisations de ces materiaux |
JP5888583B2 (ja) * | 2010-10-19 | 2016-03-22 | 株式会社リコー | トナーの製造方法及びトナー製造装置 |
US20160331695A1 (en) * | 2014-01-31 | 2016-11-17 | Fuji Capsule Co., Ltd. | Capsule Formulation |
JP6742637B2 (ja) * | 2018-03-15 | 2020-08-19 | 学校法人神奈川大学 | 金属及び樹脂複合分散液、遮熱塗料、それらを用いた金属含有樹脂膜又は赤外線反射膜の製造方法、及び金属及び樹脂複合分散液の製造方法 |
JP7455666B2 (ja) | 2020-05-27 | 2024-03-26 | 株式会社トクヤマ | 多孔質金属酸化物粉末及びその製造方法 |
CN113893830B (zh) * | 2021-09-02 | 2022-10-25 | 江苏大学 | 一种基于液滴限域空间制备氧化锆复合吸附剂的方法及其除氟应用 |
JP7033232B1 (ja) * | 2021-10-05 | 2022-03-09 | 小川香料株式会社 | 乳化組成物の製造方法 |
CN114196236B (zh) * | 2021-12-10 | 2023-07-14 | 长沙惠科光电有限公司 | 高色素炭黑及其制备方法和应用 |
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JPWO2008126477A1 (ja) | 2010-07-22 |
WO2008126477A1 (ja) | 2008-10-23 |
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