JP7093371B2 - 高吸水性樹脂およびその製造方法 - Google Patents
高吸水性樹脂およびその製造方法 Download PDFInfo
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- JP7093371B2 JP7093371B2 JP2019563204A JP2019563204A JP7093371B2 JP 7093371 B2 JP7093371 B2 JP 7093371B2 JP 2019563204 A JP2019563204 A JP 2019563204A JP 2019563204 A JP2019563204 A JP 2019563204A JP 7093371 B2 JP7093371 B2 JP 7093371B2
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- Prior art keywords
- absorbent resin
- foaming agent
- highly water
- water
- iso
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Description
本出願は2017年9月5日付韓国特許出願第10-2017-0113134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形成する段階;および
表面架橋剤の存在下に前記ベース樹脂粉末の表面を追加架橋して表面架橋層を形成する段階を含み、
前記カプセル化された発泡剤は、炭化水素を含むコアと前記コアを囲んで熱可塑性樹脂から形成されるシェルを含む構造を有し、膨張前の平均直径が5~50μmであり、空気中での最大膨張大きさは20~190μmであるものであってもよい。
コア-シェル構造を有し、コアはiso-ブタンであり、シェルはアクリレートおよびアクリロニトリルの共重合体から形成されるカプセル化された発泡剤を準備した。全体カプセル化された発泡剤重量に対してiso-ブタンは25重量%で含まれた。
コア-シェル構造を有し、コアはiso-ブタンであり、シェルはアクリレートおよびアクリロニトリルの共重合体から形成されるカプセル化された発泡剤を準備した。全体カプセル化された発泡剤の重量に対してiso-ブタンは25重量%で含まれた。
コア-シェル構造を有し、コアはiso-ペンタンであり、シェルはアクリレートおよびアクリロニトリルの共重合体から形成されるカプセル化された発泡剤を準備した。全体カプセル化された発泡剤の重量に対してiso-ペンタンは20重量%で含まれた。
コア-シェル構造を有し、コアはiso-オクタンおよびiso-ペンタンであり、シェルはアクリレートおよびアクリロニトリルの共重合体から形成されるカプセル化された発泡剤を準備した。全体カプセル化された発泡剤の重量に対してiso-オクタンは10重量%、iso-ペンタンは5重量%で含まれた。
ガラス反応器にアクリル酸100gを注入し、32重量%苛性ソーダ溶液123.5gを徐々に滴加して混合した。前記苛性ソーダ溶液の滴加時には中和熱によって混合溶液の温度が上昇して混合溶液が冷却されるのを待った。前記混合溶液の温度が約45℃に冷却されれば、混合溶液に過硫酸ナトリウム0.2g、Irgacure TPO(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、製造例1で準備したカプセル化された発泡剤0.3g、トリエチレングリコールジアクリレート0.18g、コカミドモノエタノールアミン(Cocamide monoethanolamine)0.1gおよび水47gを添加して単量体混合物を製造した。
製造例1で準備したカプセル化された発泡剤の代わりに製造例2で準備したカプセル化された発泡剤を使用したことを除いて、実施例1と同様な方法で高吸水性樹脂を製造した。
製造例1で準備したカプセル化された発泡剤を投入しないことを除いて、実施例1と同様な方法で高吸水性樹脂を製造した。
製造例1で準備したカプセル化された発泡剤の代わりにNaHCO3を使用したことを除いて、実施例1と同様な方法で高吸水性樹脂を製造した。
製造例1で準備したカプセル化された発泡剤の代わりにNaHCO3がポリエチレングリコールでカプセル化された発泡剤を使用したことを除いて、実施例1と同様な方法で高吸水性樹脂を製造した。
製造例1で準備したカプセル化された発泡剤の代わりに製造例3で準備したカプセル化された発泡剤を使用したことを除いて、実施例1と同様な方法で高吸水性樹脂を製造した。
製造例1で準備したカプセル化された発泡剤の代わりに製造例4で準備したカプセル化された発泡剤を使用したことを除いて、実施例1と同様な方法で高吸水性樹脂を製造した。
下記のような方法で実施例および比較例によって製造した高吸水性樹脂の特性を評価して下記表1に示した。
高吸水性樹脂の生理食塩水に対する遠心分離保水能(CRC)は、EDANA法NWSP241.0.R2の方法によって測定された。
W0(g)は、樹脂の初期重量(g)であり、
W1(g)は、常温で生理食塩水に樹脂を入れない不織布製の空の封筒を30分間浸水させた後、遠心分離機を使用して250Gで3分間脱水した後に測定した不織布製の空の封筒の重量であり、
W2(g)は、常温で生理食塩水に樹脂が入っている不織布製の封筒を30分間浸水して吸収させた後、遠心分離機を使用して250Gで3分間脱水した後に、樹脂を含んで測定した不織布製封筒の重量である。
高吸水性樹脂のうちの米国標準40meshスクリーンは通過し、米国標準50meshスクリーンは通過しない粒径が300~425μmであるサンプルを準備した。
高吸水性樹脂の蒸留水吸収能を測定するために、樹脂W0(g、約1.0g)を不織布製の封筒(横:16.5cm、縦:27.5cm)に均一に入れて密封した。そして、2Lプラスチックビーカーに前記封筒を入れて、24℃の蒸留水1Lを投入した。1分間樹脂を膨潤させた後、封筒を蒸留水から持ち上げて、1分間封筒が含んでいる蒸留水が重力によって下に落ちるようにした後、封筒の重量W4(g)を測定した。一方、樹脂を入れない空の封筒を用いて同一な操作をした後、その時の重量W3(g)を測定した。
W0(g)は、樹脂の初期重量(g)であり、
W3(g)は、24℃の蒸留水に樹脂が入っていない空の不織布製の封筒を1分間浸水させた後、該封筒を1分間持ち上げて自然的に脱水した後に測定した空の不織布製の封筒の重量であり、
W4(g)は、24℃の蒸留水に樹脂が入っている不織布製の封筒を1分間浸水して吸収させた後、該封筒を1分間持ち上げて自然的に脱水した後に測定した樹脂を含む不織布製の封筒の重量である。
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がカプセル化された発泡剤存在下に架橋重合された架橋重合体を含むベース樹脂粉末;および前記架橋重合体が追加架橋されて、前記ベース樹脂粉末上に形成されている表面架橋層を含む高吸水性樹脂であって、
前記カプセル化された発泡剤は、炭化水素を含むコアと前記コアを囲んで熱可塑性樹脂から形成されるシェルを含む構造を有し、膨張する前の平均直径が5~20μmであり、膨張後に多く膨張した粒子順に上位10重量%の直径で示される空気中での最大膨張大きさは50~190μmであり、
前記カプセル化された発泡剤は、膨張する前の平均直径に対する膨張後に多く膨張した粒子順に上位10重量%の平均直径の比率で定義される空気中最大膨張比率が8.5~10倍であり、
前記カプセル化された発泡剤の空気中での最大膨張大きさ及び空気中最大膨張比率は、ガラスペトリ皿の上にカプセル化された発泡剤0.2gを塗布した後、150℃で予熱されたホットプレートの上に10分間放置し、カプセル化された発泡剤を熱によって膨張させた後に光学顕微鏡で観察して測定しており、
前記カプセル化された発泡剤は発泡しており、
粒径が300~425μmである高吸水性樹脂粒子(M0)中の表面に20~200μm直径の気孔が3個以上存在する高吸水性樹脂粒子(M1)の比率(M1/M0×100)が10%以上であり、
蒸留水に対する吸収能が150g/g以上である高吸水性樹脂。 - 生理食塩水に対する遠心分離保水能(CRC)が30~45g/gである、請求項1に記載の高吸水性樹脂。
- 粒径が300~425μmである高吸水性樹脂粒子(M0)中の表面に20~200μm直径の気孔が3個以上存在する高吸水性樹脂粒子(M1)の比率(M1/M0×100)が20~70%であり、蒸留水に対する吸収能が150~500g/gである、請求項1または2に記載の高吸水性樹脂。
- 前記カプセル化された発泡剤の空気中での最大膨張大きさは70~190μmである、請求項1~3のいずれかに記載の高吸水性樹脂。
- 前記カプセル化された発泡剤は、膨張する前の平均直径が7~17μmである、請求項1~4のいずれかに記載の高吸水性樹脂。
- 前記炭化水素は、n-プロパン、n-ブタン、iso-ブタン、シクロブタン、n-ペンタン、iso-ペンタン、シクロペンタン、n-ヘキサン、iso-ヘキサン、シクロヘキサン、n-ヘプタン、iso-ヘプタン、シクロヘプタン、n-オクタン、iso-オクタンおよびシクロオクタンからなる群より選択された1種以上である、請求項1~5のいずれかに記載の高吸水性樹脂。
- 前記熱可塑性樹脂は、(メタ)アクリレート、(メタ)アクリロニトリル、芳香族ビニル、酢酸ビニル、ハロゲン化ビニル、およびハロゲン化ビニリデンからなる群より選択された1種以上のモノマーから形成されるポリマーである、請求項1~6のいずれかに記載の高吸水性樹脂。
- 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カプセル化された発泡剤存在下に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形成する段階;および
表面架橋剤の存在下に前記ベース樹脂粉末の表面を追加架橋して表面架橋層を形成する段階を含み、
前記カプセル化された発泡剤は、炭化水素を含むコアと前記コアを囲んで熱可塑性樹脂から形成されるシェルを含む構造を有し、膨張前の平均直径が5~20μmであり、膨張後に多く膨張した粒子順に上位10重量%の直径で示される空気中での最大膨張大きさは50~190μmであり、
前記カプセル化された発泡剤は、膨張する前の平均直径に対する膨張後に多く膨張した粒子順に上位10重量%の平均直径の比率で定義される空気中最大膨張比率が8.5~10倍である請求項1~7のいずれかに記載の高吸水性樹脂の製造方法。 - 前記炭化水素は、n-プロパン、n-ブタン、iso-ブタン、シクロブタン、n-ペンタン、iso-ペンタン、シクロペンタン、n-ヘキサン、iso-ヘキサン、シクロヘキサン、n-ヘプタン、iso-ヘプタン、シクロヘプタン、n-オクタン、iso-オクタン、およびシクロオクタンからなる群より選択された1種以上である、請求項8に記載の高吸水性樹脂の製造方法。
- 前記熱可塑性樹脂は、(メタ)アクリレート、(メタ)アクリロニトリル、芳香族ビニル、酢酸ビニル、ハロゲン化ビニル、およびハロゲン化ビニリデンからなる群より選択された1種以上のモノマーから形成されるポリマーである、請求項8または9に記載の高吸水性樹脂の製造方法。
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