JP2022517074A - 高吸水性樹脂組成物およびその製造方法 - Google Patents
高吸水性樹脂組成物およびその製造方法 Download PDFInfo
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- JP2022517074A JP2022517074A JP2021540207A JP2021540207A JP2022517074A JP 2022517074 A JP2022517074 A JP 2022517074A JP 2021540207 A JP2021540207 A JP 2021540207A JP 2021540207 A JP2021540207 A JP 2021540207A JP 2022517074 A JP2022517074 A JP 2022517074A
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- absorbent resin
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Abstract
Description
本出願は2019年9月30日付韓国特許出願第10-2019-0121171号に基づく優先権の利益を主張し、当該韓国特許出願の文献に開示されたすべての内容は本明細書の一部として含まれる。
内部架橋剤の存在下で、少なくとも一部が中和された酸性基を有する水溶性エチレン系不飽和単量体を架橋重合して含水ゲル重合体を形成する段階;
前記含水ゲル重合体を乾燥、粉砕、および分級してベース樹脂粉末を得る段階;および
環状カーボネート系表面架橋剤およびドデシル硫酸ナトリウムを含む表面架橋液の存在下で前記ベース樹脂粉末を表面架橋して高吸水性樹脂粒子を形成する段階;を含む、
高吸水性樹脂組成物の製造方法を提供する。
前記高吸水性樹脂粒子の表面の一部に、環状カーボネート系表面架橋剤およびドデシル硫酸ナトリウムを媒介に前記架橋重合体が追加架橋されて形成された表面架橋層をさらに含む。
発明の一実施形態によれば、内部架橋剤の存在下で、少なくとも一部が中和された酸性基を有する水溶性エチレン系不飽和単量体を架橋重合して含水ゲル重合体を形成する段階;前記含水ゲル重合体を乾燥、粉砕、および分級し、ベース樹脂粉末を得る段階;および環状カーボネート系表面架橋剤およびドデシル硫酸ナトリウムを含む表面架橋液の存在下で前記ベース樹脂粉末を表面架橋して高吸水性樹脂粒子を形成する段階;を含む、高吸水性樹脂組成物の製造方法が提供される。
前記表面架橋剤は環状カーボネート系化合物であり、表面架橋段階で親水性作用機作により水を速やかに吸収できるようにし、後述するドデシル硫酸ナトリウムと組み合わせて使用時、吸収速度をさらに改善することができる。
一実施形態による高吸水性樹脂の製造方法で、先に内部架橋剤および重合開始剤の存在下で、少なくとも一部が中和された酸性基を有する水溶性エチレン系不飽和単量体を架橋重合して含水ゲル重合体を形成する段階を行う。
R1-COOM1
R1は不飽和結合を含む炭素数2~5のアルキル基であり、
M1は水素原子、1価または2価金属、アンモニウム基または有機アミン塩である。
次に、前記含水ゲル重合体を乾燥、粉砕、および分級し、ベース樹脂粉末を得る段階を行う。
次に、環状カーボネート系表面架橋剤およびドデシル硫酸ナトリウムを含む表面架橋液の存在下で前記製造されたベース樹脂粉末を表面架橋して高吸水性樹脂粒子を形成する段階を行う。
一方、本発明の他の一実施形態によれば、上述した製造方法により製造された高吸水性樹脂組成物が提供される。
前記高吸水性樹脂粒子の表面の一部に、環状カーボネート系表面架橋剤およびドデシル硫酸ナトリウムを媒介に前記架橋重合体が追加架橋されて形成された表面架橋層をさらに含む。
<高吸水性樹脂の製造>
実施例1
攪拌機、温度計を取り付けた3Lガラス容器にアクリル酸450g、内部架橋剤であるポリエチレングリコールジアクリレート(PEGDA 400,Mw=400)2000ppm、光開始剤であるジフェニル(2,4,6-トリメチルベンゾイル)-ホスフィンオキシド80ppmを添加して溶解させた後、31.5%酸化ナトリウム溶液618gを添加して水溶性不飽和単量体水溶液を製造した(中和度:73mol%;固形分含有量:45.1重量%)。前記水溶性不飽和単量体水溶液の温度が中和熱によって上昇した後40℃になると、この混合液を熱重合開始剤である過硫酸ナトリウム(sodium persulfate;SPS)2400ppmが入っている容器に入れた後、1分間紫外線を照射(照射量:10mV/cm2)してUV重合を実施して80℃のオーブンで120秒間熱を加えてエージング(aging)させて含水ゲル状重合体シートを収得した。収得した含水ゲル状重合体シートを孔径(hole size)が16mmであるチョッパー(chopper)を通過させて粉(crumb)を製造した。前記粉(crumb)を上下に風量転移が可能なオーブンで乾燥した。185℃のホットエア(hot air)を15分は下方から上方に、15分は上方から下方に流れるようにして均一に乾燥し、乾燥後乾燥体の含水量は2%以下になるようにした。このように乾燥工程を経てASTM規格の標準網ふるいで分級して150~850μmの粒子の大きさを有するベース樹脂粉末を得た。
下記表1の成分および含有量を使用したことを除いては、実施例1と同様の方法で高吸水性樹脂組成物を製造した。
前記実施例および比較例で製造した高吸水性樹脂組成物について、次のような方法で物性を評価し、その結果を表2に示した。
高吸水性樹脂のうち150~850μmの粒径を有するものを取って、欧州不織布工業会(European Disposables and Nonwovens Association,EDANA)の規格EDANA WSP 241.3に従い無荷重下吸収倍率による遠心分離保水能(CRC)を測定した。
CRC(g/g)={[W2(g)-W1(g)]/W0(g)}-1
各樹脂の0.7psiの加圧吸収能をEDANA法WSP 242.3に従い測定した。加圧吸収能の測定時には前記CRC測定時の樹脂分級分を使用した。
AUP(g/g)=[W4(g)-W3(g)]/W0(g)
実施例および比較例の高吸水性樹脂の吸収速度は国際公開第1987/003208号に記載された方法に準じて秒単位で測定された。
Claims (8)
- 内部架橋剤の存在下で、少なくとも一部が中和された酸性基を有する水溶性エチレン系不飽和単量体を架橋重合して含水ゲル重合体を形成する段階;
前記含水ゲル重合体を乾燥、粉砕、および分級してベース樹脂粉末を得る段階;および
環状カーボネート系表面架橋剤およびドデシル硫酸ナトリウムを含む表面架橋液の存在下で前記ベース樹脂粉末を表面架橋して高吸水性樹脂粒子を形成する段階;を含む、高吸水性樹脂組成物の製造方法。 - 前記環状カーボネート系表面架橋剤は、エチレンカーボネート、プロピレンカーボネート、およびグリセロールカーボネートからなる群より選ばれた1種以上を含む、請求項1に記載の高吸水性樹脂組成物の製造方法。
- 前記環状カーボネート系表面架橋剤は、
ベース樹脂総100重量部に対して、0.5~5重量部で含まれる、請求項1または2に記載の高吸水性樹脂組成物の製造方法。 - 前記環状カーボネート系表面架橋剤は、
表面架橋剤100重量部に対して、エチレンカーボネート10~50重量部、プロピレンカーボネート10~50重量部、およびグリセロールカーボネート10~50重量部を含む、請求項1から3のいずれか一項に記載の高吸水性樹脂組成物の製造方法。 - 前記ドデシル硫酸ナトリウムは、
ベース樹脂総100重量部に対して、0.001~1.0重量部で含まれる、請求項1から4のいずれか一項に記載の高吸水性樹脂組成物の製造方法。 - 前記表面架橋して高吸水性樹脂粒子を形成する段階は、150℃~200℃で40~100分間行われる、請求項1から5のいずれか一項に記載の高吸水性樹脂組成物の製造方法。
- 少なくとも一部が中和された酸性基を有する水溶性エチレン系不飽和単量体の架橋重合体を含む高吸水性樹脂粒子;を含み、
前記高吸水性樹脂粒子の表面の一部に、環状カーボネート系表面架橋剤およびドデシル硫酸ナトリウムを媒介に前記架橋重合体が追加架橋されて形成された表面架橋層をさらに含む、高吸水性樹脂組成物。 - 吸収速度(vortex time)が50秒~65秒である、請求項7に記載の高吸水性樹脂組成物。
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WO2012102407A1 (ja) * | 2011-01-28 | 2012-08-02 | 株式会社日本触媒 | ポリアクリル酸(塩)系吸水性樹脂粉末の製造方法 |
WO2018062539A1 (ja) * | 2016-09-30 | 2018-04-05 | 株式会社日本触媒 | 吸水性樹脂組成物 |
WO2019117482A1 (ko) * | 2017-12-15 | 2019-06-20 | 주식회사 엘지화학 | 고흡수성 수지 및 이의 제조 방법 |
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EP3892670A1 (en) | 2021-10-13 |
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EP3892670A4 (en) | 2022-07-06 |
JP7258401B2 (ja) | 2023-04-17 |
BR112021015547A2 (pt) | 2022-04-05 |
WO2021066313A1 (ko) | 2021-04-08 |
US20220088569A1 (en) | 2022-03-24 |
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