JP2022504321A - 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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- JP2022504321A JP2022504321A JP2021518712A JP2021518712A JP2022504321A JP 2022504321 A JP2022504321 A JP 2022504321A JP 2021518712 A JP2021518712 A JP 2021518712A JP 2021518712 A JP2021518712 A JP 2021518712A JP 2022504321 A JP2022504321 A JP 2022504321A
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- absorbent resin
- water
- highly water
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- weight
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Abstract
Description
本出願は2019年9月18日付韓国特許出願第10-2019-0114791号および2020年8月7日付韓国特許出願第10-2020-0099393号に基づいた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全ての内容は本明細書の一部として含まれる。
前記高吸水性樹脂粒子に、炭素数10~30の脂肪族炭化水素のカルボン酸を含む添加剤および水を混合して加水高吸水性樹脂を形成する段階を含む高吸水性樹脂の製造方法を提供する。
前記高吸水性樹脂粒子に、炭素数10~30の脂肪族炭化水素のカルボン酸を含む添加剤および水を混合して加水高吸水性樹脂を形成する段階を含む高吸水性樹脂の製造方法が提供される。
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。
実施例1:高吸水性樹脂の製造
アクリル酸100g、32%苛性ソーダ123.5g、熱重合開始剤である過硫酸ナトリウム0.2g、光重合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0.008g、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2.25gおよび水59.0gを混合して全体固形分濃度が45重量%である単量体組成物を製造した。前記単量体組成物を10cmの幅および2mの長さを有して50cm/minの速度で回転する回転式ベルト上に、500mL/min~2000mL/minの速度で供給した。前記供給された単量体組成物に10mW/cm2の強さで紫外線を照射して60秒間架橋重合を行った。
前記ラウリン酸0.0250gの代わりにステアリン酸0.0250g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の最終製品を得た。
前記ラウリン酸0.0250gの代わりにアラキジン酸0.0250g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の最終製品を得た。
まず、高吸水性樹脂粒子は実施例1と同様の方法で製造した。但し、実施例1で追加的に行われた超純水およびラウリン酸の混合溶液を投与および混合する段階、以後の追加乾燥および分級段階を行わず、前記高吸水性樹脂粒子自体を比較例1の高吸水性樹脂の最終製品とした。
まず、高吸水性樹脂粒子は実施例1と同様の方法で製造した。
前記ラウリン酸0.0250gの代わりに大韓民国公開特許第2015-0143167号の製造例1に開示されたポリカルボン酸共重合体0.0250g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の最終製品を得た。
前記ラウリン酸0.0250gの代わりにMw600のポリエチレングリコール0.25g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の最終製品を得た。
前記実施例および比較例で製造した高吸水性樹脂に対して、以下のような方法で諸般物性を測定し、その結果を下記表1に示した。
まず、高吸水性樹脂のうち、150~850μmの粒径を有するもの(#20~100の標準ふるいの間)を取って、ヨーロッパ不織布産業協会(European Disposables and Nonwovens Association、EDANA)規格EDANA WSP241.3によって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)]/W0(g)}
粒度分布の測定のために、ASTM規格の標準網ふるいを使用して、高吸水性樹脂を分級した。より具体的に、目の大きさがそれぞれ850μm、600μm、300μm、150μmである標準網ふるいを順次に積層した後、一番上に高吸水性樹脂100gを入れてsieve shaker(AS200)にセッティングした。Amplitude1.0mm/gで10分間分級を行った。それぞれの標準網ふるいの間に残っている高吸水性樹脂を取り出して重量を測り百分率に計算して、高吸水性樹脂の粒度分布を算出した。
高吸水性樹脂を赤外線加熱しながら乾燥する過程で、高吸水性樹脂中の水分蒸発による重量減少分を測定して計算された値で測定した。この時、乾燥条件は常温から約140℃まで温度を上昇させた後、140℃で維持する方式で総乾燥時間は10分に設定した。上記重量減少分の測定結果から含水率を算出した。
Claims (10)
- 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ベース樹脂粉末と、前記架橋重合体が追加架橋されて前記ベース樹脂粉末表面に形成された表面架橋層を含む高吸水性樹脂粒子を提供する段階;および
前記高吸水性樹脂粒子に、炭素数10~30の脂肪族炭化水素のカルボン酸を含む添加剤および水を混合して加水高吸水性樹脂を形成する段階を含む、高吸水性樹脂の製造方法。 - 前記添加剤は、炭素数12~20の線状アルキル基末端にカルボン酸が結合された化合物を含む、請求項1に記載の高吸水性樹脂の製造方法。
- 前記添加剤は、ステアリン酸(stearic acid)、ラウリン酸(lauric acid)およびアラキジン酸(Arachidic acid)からなる群より選択された1種以上のカルボン酸化合物を含む、請求項1または2に記載の高吸水性樹脂の製造方法。
- 前記添加剤は、前記高吸水性樹脂粒子の重量を基準にして5~20,000ppmwの含量で混合される、請求項1から3のいずれか一項に記載の高吸水性樹脂の製造方法。
- 前記水は、前記高吸水性樹脂粒子の100重量部に対して1~10重量部の含量で混合される、請求項1から4のいずれか一項に記載の高吸水性樹脂の製造方法。
- 前記添加剤および水の混合段階は、40~80℃の温度下で行われる、請求項1から5のいずれか一項に記載の高吸水性樹脂の製造方法。
- 前記添加剤および水の混合段階後に、前記加水高吸水性樹脂を乾燥および分級する段階をさらに含み、
前記乾燥および分級された高吸水性樹脂は150~850μmの粒径と、1~2.5重量%の含水率を有する、請求項1から6のいずれか一項に記載の高吸水性樹脂の製造方法。 - 前記分級過程で除去される850μm超過の粒径を有する粒子は、前記乾燥された高吸水性樹脂の全体重量を基準にして5重量%未満になる、請求項7に記載の高吸水性樹脂の製造方法。
- 前記乾燥および分級された高吸水性樹脂は、生理食塩水(0.9重量%塩化ナトリウム水溶液)に対する30分間の遠心分離保水能(CRC)が30~45g/gである、請求項7または8に記載の高吸水性樹脂の製造方法。
- 前記乾燥および分級された高吸水性樹脂を移送する段階をさらに含む、請求項7から9のいずれか一項に記載の高吸水性樹脂の製造方法。
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