JP2017502108A - 高吸水性樹脂の製造方法 - Google Patents
高吸水性樹脂の製造方法 Download PDFInfo
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- JP2017502108A JP2017502108A JP2016534212A JP2016534212A JP2017502108A JP 2017502108 A JP2017502108 A JP 2017502108A JP 2016534212 A JP2016534212 A JP 2016534212A JP 2016534212 A JP2016534212 A JP 2016534212A JP 2017502108 A JP2017502108 A JP 2017502108A
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- water
- polymer
- superabsorbent resin
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- superabsorbent
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Abstract
Description
水溶性エチレン系不飽和単量体、内部架橋剤および重合開始剤を含む単量体組成物に熱重合または光重合を行ってゲル強度(Gel Strength)が10,000〜13,000Paである含水ゲル状重合体を形成する段階;
前記含水ゲル状重合体を粗粉砕する段階;
前記粗粉砕された含水ゲル状重合体を乾燥する段階;
前記乾燥された重合体を粉砕する段階;および
前記粉砕された重合体と表面架橋剤を混合して表面架橋反応を遂行する段階を含む、高吸水性樹脂の製造方法を提供する。
水溶性エチレン系不飽和単量体、内部架橋剤および重合開始剤を含む単量体組成物に熱重合または光重合を行ってゲル強度(Gel Strength)が10,000〜13,000Paである含水ゲル状重合体を形成する段階;
前記含水ゲル状重合体を粗粉砕する段階;
前記粗粉砕された含水ゲル状重合体を乾燥する段階;
前記乾燥された重合体を粉砕する段階;および
前記粉砕された重合体と表面架橋剤を混合して表面架橋反応を遂行する段階を含む。
W0(g)は高吸水性樹脂の重量(g)であり、W1(g)は高吸水性樹脂を使用せず、遠心分離機を用いて250Gで3分間脱水した後に測定した装置重量であり、W2(g)は常温に0.9質量%の生理食塩水に高吸水性樹脂を30分間浸水させた後に、遠心分離機を用いて250Gで3分間脱水した後に高吸水性樹脂を含んで測定した装置重量である。特に、前記高吸水性樹脂の重量W0(g)は、300〜600マイクロメートル(μm)に分級された高吸水性樹脂の重量で測定され得る。
W0(g)は高吸水性樹脂の重量(g)であり、W3(g)は高吸水性樹脂の重量および前記高吸水性樹脂に荷重を付与することができる装置の重量の総合計であり、W4(g)は荷重(0.9psi)下に1時間前記高吸水性樹脂に水分を供給した後の水分が吸収された高吸水性樹脂の重量および前記高吸水性樹脂に荷重を付与することができる装置重量の総合計である。
実施例1
25℃で予め冷却された熱媒体が循環するジャケットで囲まれた2L容量のガラス反応器に、アクリル酸450gにアクリル酸に希釈された0.5重量%IRGACURE819開始剤8gを混合し、アクリル酸に希釈された5重量%ポリエチレングリコールジアクリレート(PEGDA、分子量598g/mol、硬化量(Cure Dose)200mJ/cm2)50gを混合した溶液を注入し、アクリル酸に希釈された5重量%1,6−ヘキサンジオールジアクリレート(1,6−hexandiol diacrylate、分子量226g/mol、 硬化量(Cure Dose)320mJ/cm2)10gを注入し、32重量%苛性ソーダ溶液660gを徐々に滴加して混合した。
前記実施例1で、アクリル酸に希釈された5重量%ポリエチレングリコールジアクリレートの使用量を50gの代わりに55gにし、アクリル酸に希釈された5重量%1,6−ヘキサンジオールジアクリレートの使用量を10gの代わりに11gにしたことを除いては、実施例1と同様な方法で高吸水性樹脂を製造した。
前記実施例1で、アクリル酸に希釈された5重量%ポリエチレングリコールジアクリレートの使用量を50gの代わりに46gにし、アクリル酸に希釈された5重量%1,6−ヘキサンジオールジアクリレートの使用量を10gの代わりに9gにしたことを除いては、実施例1と同様な方法で高吸水性樹脂を製造した。
前記実施例1で、多孔板の孔の直径が8mmの大きさを有するミートチョッパの代わりに多孔板の孔の直径が6.5mmの大きさを有するミートチョッパを使用したことを除いては、実施例1と同様な方法で高吸水性樹脂を製造した。
前記実施例1で、多孔板の孔の直径が8mmの大きさを有するミートチョッパの代わりに多孔板の孔の直径が10mmの大きさを有するミートチョッパを使用したことを除いては、実施例1と同様な方法で高吸水性樹脂を製造した。
前記実施例1で、アクリル酸に希釈された5重量%ポリエチレングリコールジアクリレートの使用量を50gの代わりに62gにし、アクリル酸に希釈された5重量%1,6−ヘキサンジオールジアクリレートの使用量を10gの代わりに21gにしたことを除いては、実施例1と同様な方法で高吸水性樹脂を製造した。
前記実施例1で、アクリル酸に希釈された5重量%ポリエチレングリコールジアクリレートの使用量を50gの代わりに31gにし、アクリル酸に希釈された5重量%1,6−ヘキサンジオールジアクリレートを使用しないことを除いては、実施例1と同様な方法で高吸水性樹脂を製造した。
前記実施例1で、アクリル酸に希釈された5重量%ポリエチレングリコールジアクリレートの使用量を50gの代わりに62gにし、アクリル酸に希釈された5重量%1,6−ヘキサンジオールジアクリレートの使用量を10gの代わりに21gにし、多孔板の孔の直径が8mmの大きさを有するミートチョッパの代わりに多孔板の孔の直径が16mmの大きさを有するミートチョッパを使用したことを除いては、実施例1と同様な方法で高吸水性樹脂を製造した。
前記実施例1で、アクリル酸に希釈された5重量%ポリエチレングリコールジアクリレートの使用量を50gの代わりに31gにし、アクリル酸に希釈された5重量%1,6−ヘキサンジオールジアクリレートを使用せず、多孔板の孔の直径が8mmの大きさを有するミートチョッパの代わりに多孔板の孔の直径が16mmの大きさを有するミートチョッパを使用したことを除いては、実施例1と同様な方法で高吸水性樹脂を製造した。
前記実施例1で、多孔板の孔の直径が8mmの大きさを有するミートチョッパの代わりに多孔板の孔の直径が16mmの大きさを有するミートチョッパを使用したことを除いては、実施例1と同様な方法で高吸水性樹脂を製造した。
実施例1〜5および比較例1〜5によって製造された高吸水性樹脂に対して次のような方法で物性評価を遂行し、測定された物性値は下記表3に示した。
実施例1〜5および比較例1〜5の高吸水性樹脂の製造方法で得られた含水ゲル状重合体に対して、次のような方法によってゲル強度(Gel Strength)を測定した。
ヨーロッパ不織布産業協会(European Disposables and Nonwovens Association、EDANA)規格EDANA WSP 241.2により実施例1〜5および比較例1〜5の高吸水性樹脂に対して、無荷重下吸収倍率による保水能を測定した。
W0(g)は、高吸水性樹脂の重量(g)であり、
W1(g)は、高吸水性樹脂を使用せず、遠心分離機を用いて250Gで3分間脱水した後に測定した装置重量であり、
W2(g)は、常温に0.9質量%の生理食塩水に高吸水性樹脂を30分間浸水させた後に、遠心分離機を用いて250Gで3分間脱水した後に高吸水性樹脂を含んで測定した装置重量である。
実施例1〜5および比較例1〜5の高吸水性樹脂に対して、ヨーロッパ不織布産業協会(European Disposables and Nonwovens Association、EDANA)規格EDANA WSP 242.2により、0.9psiの加圧吸水能(AUL:Absorbency under Load)を測定した。
W0(g)は、高吸水性樹脂の重量(g)であり、
W3(g)は、高吸水性樹脂の重量および前記高吸水性樹脂に荷重を付与することができる装置重量の総合計であり、
W4(g)は、荷重(0.9psi)下に1時間前記高吸水性樹脂に水分を供給した後の水分が吸収された高吸水性樹脂の重量および前記高吸水性樹脂に荷重を付与することができる装置重量の総合計である。
実施例1〜5および比較例1〜5の高吸水性樹脂に対して、国際公開特許WO2009/016055号に記載された方法によって吸収速度(FSR)を測定した。
実施例1〜5および比較例1〜5の高吸水性樹脂に対して、米国特許5,669,894号に記載された方法によって溶液透過度(SFC)を測定した。
Claims (9)
- 水溶性エチレン系不飽和単量体、内部架橋剤および重合開始剤を含む単量体組成物に熱重合または光重合を行ってゲル強度(Gel Strength)が10,000〜13,000Paである含水ゲル状重合体を形成する段階;
前記含水ゲル状重合体を粗粉砕する段階;
前記粗粉砕された含水ゲル状重合体を乾燥する段階;
前記乾燥された重合体を粉砕する段階;および
前記粉砕された重合体と表面架橋剤を混合して表面架橋反応を遂行する段階を含む、高吸水性樹脂の製造方法。 - 前記含水ゲル状重合体を粗粉砕する段階は、前記含水ゲル状重合体をホール(hole)が形成されている出口に押し出す方式で遂行する、請求項1に記載の高吸水性樹脂の製造方法。
- 前記ホールの直径と前記含水ゲル状重合体のゲル強度は、下記式1を満足する、請求項2に記載の高吸水性樹脂の製造方法:
[式1]
1140*x+730<y<600*x+8400
上記式1において、
xはホールの直径(単位:mm)であり、yは粗粉砕前の含水ゲル状重合体のゲル強度(単位:Pa)である。 - 前記内部架橋剤は、前記水溶性エチレン系不飽和単量体の硬化量(cure dose)に対して80%〜200%の硬化量を有する化合物である、請求項1に記載の高吸水性樹脂の製造方法。
- 前記内部架橋剤は、160〜400mJ/cm2の硬化量を有する化合物である、請求項1に記載の高吸水性樹脂の製造方法。
- 前記内部架橋剤は、ポリエチレングリコールジアクリレート(polyethyleneglycol diacrylate)、ヘキサンジオールジアクリレート(hexanediol diacrylate)、およびエトキシ化トリメチロールプロパントリアクリレート(ethoxylated TMPTA(trimethylolpropane triacrylate))からなる群より選択される2種以上である、請求項1に記載の高吸水性樹脂の製造方法。
- 前記内部架橋剤は、前記単量体組成物に含まれている前記水溶性エチレン系不飽和単量体の全体重量に対して4,000〜7,500ppmで含まれる、請求項1に記載の高吸水性樹脂の製造方法。
- 前記粉砕された重合体に表面架橋反応を遂行する段階前に、粒径が150〜850μmである重合体に分級する段階を追加的に含むことを特徴とする請求項1に記載の高吸水性樹脂の製造方法。
- 前記高吸水性樹脂の遠心分離保水能(CRC)は25g/g以上であり、加圧吸水能(AUL)は20g/g以上であり、吸収速度(FSR)は0.25g/g/s以上であり、溶液透過度(SFC)は70*10-7cm3*sec/g以上である、請求項1に記載の高吸水性樹脂の製造方法。
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