JP7337192B2 - 被覆樹脂粒子の製造方法 - Google Patents
被覆樹脂粒子の製造方法 Download PDFInfo
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- JP7337192B2 JP7337192B2 JP2021564012A JP2021564012A JP7337192B2 JP 7337192 B2 JP7337192 B2 JP 7337192B2 JP 2021564012 A JP2021564012 A JP 2021564012A JP 2021564012 A JP2021564012 A JP 2021564012A JP 7337192 B2 JP7337192 B2 JP 7337192B2
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Description
水溶性樹脂粒子を構成し得るエチレン性不飽和単量体は、後述する吸水性樹脂粒子の形成材料と同じものを用いることができるが、水溶性樹脂粒子として用いられるエチレン性不飽和単量体の重合体は吸水性を有さない(例えば、25℃のイオン交換水の吸水量(常圧下の吸水量)が、10g/g未満である)。このような重合体は、例えば、内部架橋剤を用いずにエチレン性不飽和単量体を重合することにより得られる。
(実施例1)
還流冷却器、滴下ロート、窒素ガス導入管、及び、撹拌機(翼径5cmの4枚傾斜パドル翼を2段有する撹拌翼)を備えた内径11cm、内容積2Lの丸底円筒型セパラブルフラスコを準備した。このフラスコに、n-ヘプタン293g、及び、無水マレイン酸変性エチレン・プロピレン共重合体(分散剤、三井化学株式会社製、ハイワックス1105A)0.736gを添加することにより混合物を得た。この混合物を撹拌しつつ80℃まで昇温することにより分散剤をn-ヘプタンに溶解させた後、混合物を50℃まで冷却した。
モノマー種Aの溶液を37質量%ホルムアルデヒド水溶液1.08g及びイオン交換水6.92gの混合液8.0gに変更し、モノマー種Bの溶液をフェノール1.26g及びアセトン11.34gの混合液12.6gに変更したこと以外は実施例1と同様に行うことにより評価用粒子として被覆樹脂粒子を作製した。
撹拌機(翼径5cmの4枚傾斜パドル翼を2段有する撹拌翼)を備えた内径11cm、内容積2Lの丸底円筒型セパラブルフラスコに509.71g(7.07モル)の100%アクリル酸を入れた。このアクリル酸を撹拌しながら、セパラブルフラスコ内にイオン交換水436.47gを加えた。その後、氷浴(1℃)下で444.68gの48質量%水酸化ナトリウムを滴下することにより単量体濃度45.08質量%のアクリル酸部分中和液(中和率:75.44モル%)1390.86gを調製した。本操作を3回繰り返し、後述の重合に用いた。
モノマー種Aの溶液をポリエーテルポリオール(AGC株式会社製、EXCENOL750ED)0.4g及びイオン交換水7.6gの混合液8.0gに変更し、モノマー種Bの溶液をトリレン-2,4-ジイソシアナート0.48g及びアセトン4.28gの混合液4.76gに変更し、被コーティング体を吸水性樹脂粒子から水溶性樹脂粒子であるヒドロキシエチルセルロース(住友精化株式会社製、AH-15)に変更したこと以外は実施例1と同様に行うことにより評価用粒子として被覆樹脂粒子を作製した。
モノマー種Aの溶液をポリエーテルポリオール(第一工業製薬株式会社製、DKポリオール3817)4.0g及びアセトン76.0gの混合液80.0gに変更したこと以外は実施例1と同様に行うことにより評価用粒子を作製した。
撹拌機(翼径10cmの錨型撹拌翼)を備えた内径11cm、内容積2Lの丸底円筒型セパラブルフラスコを準備した。このフラスコに、実施例1と同様の吸水性樹脂粒子40.0gを加えた。
上述の各実施例及び比較例2の被覆樹脂粒子(評価用樹脂)並びに被コーティング体の中位粒子径を下記手順により測定した。
すなわち、JIS標準篩を上から、目開き600μmの篩、目開き500μmの篩、目開き400μmの篩、目開き300μmの篩、目開き250μmの篩、目開き180μmの篩、目開き150μmの篩、及び、受け皿の順に組み合わせた。組み合わせた最上の篩に、吸水性樹脂粒子50gを入れ、ロータップ式振とう器を用いて10分間振とうさせて分級した。分級後、各篩上に残った粒子の質量を全量に対する質量百分率として算出し粒度分布を求めた。この粒度分布に関して粒子径の大きい方から順に篩上を積算することにより、篩の目開きと篩上に残った粒子の質量百分率の積算値との関係を対数確率紙にプロットした。確率紙上のプロットを直線で結ぶことにより、積算質量百分率50質量%に相当する粒子径を中位粒子径として得た。
各実施例の被覆樹脂粒子の中位粒子径は、413μm(実施例1)、355μm(実施例2)、376μm(実施例3)、167μm(実施例4)であった。比較例2の被覆樹脂粒子の中位粒子径は、850μmを超えていた。実施例1,2及び比較例2の被コーティング体の中位粒子径は357μmであった。実施例3の被コーティング体の中位粒子径は358μmであった。実施例4の被コーティング体の中位粒子径は152μmであった。
実施例1~4では、被コーティング体の中位粒子径に対して被覆樹脂粒子の中位粒子径が大きく変化していないことから、被覆樹脂粒子が凝集していないことが確認された。一方、比較例2では、被コーティング体の中位粒子径に対して被覆樹脂粒子の中位粒子径が大きく変化していることから、被覆樹脂粒子が凝集していることが確認された。比較例2では、被コーティング体(吸水性樹脂粒子)を分散体としなかったため、凝集が発生したと思われる。
走査電子顕微鏡(SEM、日本電子株式会社(JEOL)製、JSM-6390LA)を用いて評価用粒子の状態を観察した。サンプルステージ上に両面カーボンテープの一方面を貼り付けた後、両面カーボンテープの一方面の他方面に評価用粒子を載せた。加速電圧15kV、動作距離10mmに設定し、評価用粒子を100倍及び500倍の倍率で観察した。図2~7は、実施例1~4及び比較例1~2の評価用粒子のSEM写真を示す図面である。図中、(a)は100倍の写真であり、(b)は500倍の写真である。
実施例1~4では、白い物質が観察されておらず、被コーティング体である樹脂粒子の表面に被覆部が形成されて被覆樹脂粒子が得られていることが確認された。
比較例2では、白い物質が観察されておらず、被コーティング体である樹脂粒子の表面に被覆部が形成されて被覆樹脂粒子が得られているものの、上述の中位粒子径の測定結果で確認されたように、被覆樹脂粒子が凝集していることが確認された。
500mLポリビーカーにイオン交換水を250mL加えた。ジャーテスター(株式会社宮本製作所製、MJS-10H)に上述のビーカーを置いた後、イオン交換水を400rpmで撹拌させながら、実施例4の評価用粒子(被覆樹脂粒子)5gをビーカーに徐々に投入して均一分散させて分散液を得た。粒子の投入開始から2分以内に粒子の全量の投入を完了した。投入が完了した時点での分散液の粘度を粘度計(芝浦セムテック株式会社製、ビスメトロン VS-H1型)で測定し、0分値の粘度(25℃)を得た。その後、分散液を240rpmで撹拌しつつ5分、10分、30分及び60分後の分散液の粘度(25℃)を得た。
Claims (7)
- 水溶性樹脂粒子及び吸水性樹脂粒子からなる群より選ばれる少なくとも一種の樹脂粒子の分散体に、水溶性の第1の物質及び水を含む液を混合することにより混合体を得る工程、及び、
前記第1の物質と重合反応する第2の物質を前記混合体に混合することにより、前記樹脂粒子の少なくとも一部を被覆する被覆部を得る工程を備え、
前記液における第1の物質の含有量が前記水100質量部に対して0.1~50質量部である、被覆樹脂粒子の製造方法。 - 中位粒子径が150μm以上の被覆樹脂粒子の製造方法であって、
水溶性樹脂粒子及び吸水性樹脂粒子からなる群より選ばれる少なくとも一種の樹脂粒子の分散体に、水溶性の第1の物質及び水を含む液を混合することにより混合体を得る工程、及び、
前記第1の物質と重合反応する第2の物質を前記混合体に混合することにより、前記樹脂粒子の少なくとも一部を被覆する被覆部を得る工程を備える、被覆樹脂粒子の製造方法。 - 前記重合反応が逐次重合反応である、請求項1又は2に記載の被覆樹脂粒子の製造方法。
- 前記水溶性樹脂粒子が多糖類を含む、請求項1~3のいずれか一項に記載の被覆樹脂粒子の製造方法。
- 前記吸水性樹脂粒子が、(メタ)アクリル酸及びその塩からなる群より選ばれる少なくとも一種に由来する構造単位を有する、請求項1~4のいずれか一項に記載の被覆樹脂粒子の製造方法。
- 前記第1の物質がポリオールを含み、前記第2の物質がポリイソシアネートを含む、請求項1~5のいずれか一項に記載の被覆樹脂粒子の製造方法。
- 前記第1の物質がアルデヒドを含み、前記第2の物質がフェノール化合物を含む、請求項1~6のいずれか一項に記載の被覆樹脂粒子の製造方法。
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WO2021117781A1 (ja) | 2021-06-17 |
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WO2021117782A1 (ja) | 2021-06-17 |
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CN114829459A (zh) | 2022-07-29 |
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