JP6989695B2 - 高吸水性樹脂シートの製造方法 - Google Patents
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Description
本出願は、2018年5月11日付韓国特許出願第10−2018−0054365号および2019年4月29日付韓国特許出願第10−2019−0049878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すべての内容を本明細書の一部として含む。
酸性基を有し、前記酸性基の少なくとも一部が中和したアクリル酸系単量体、ポリエチレングリコール(メチルエーテル)(メタ)アクリレート(Polyethylene glycol (methyl ether) (meth)acrylate)を含む共単量体、内部架橋剤、カプセル化した発泡剤、平均粒径1〜100nmの無機発泡剤、および重合開始剤を混合してモノマー組成物を製造する段階;
前記モノマー組成物を熱重合または光重合して含水ゲル重合体を形成する段階;および
前記含水ゲル重合体を乾燥して高吸水性樹脂シートを形成する段階;
を含む高吸水性樹脂シートの製造方法であって、
前記カプセル化した発泡剤と無機発泡剤は、3:1〜1:1の重量比で含まれる高吸水性樹脂シートの製造方法を提供する。
[化学式1]
R1−COOM1
前記化学式1において、
R1は不飽和結合を含む炭素数2〜5のアルキルグループであり、
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)
アクリル酸27.5g、苛性ソーダ(NaOH、30重量%溶液)35.7gおよび水5.7gを混合して前記アクリル酸の約70モル%が中和した中和液(固形分含有量:50重量%)を準備した。
前記実施例1で、アクリル酸100重量%に対して無機発泡剤を0.5%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シートを製造した。
前記実施例1で、炭酸カルシウム発泡剤を使用しなかっ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シートを製造した。
前記実施例1で、カプセル化した発泡剤を使用しなかっ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シートを製造した。
前記実施例1で、カプセル化した発泡剤および炭酸カルシウム発泡剤を使用しなかっ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シートを製造した。
前記実施例1で、アクリル酸100重量%に対してカプセル化した発泡剤を4.5重量%、無機発泡剤を1.5重量%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シートを製造した。
前記実施例1で、アクリル酸100重量%に対してカプセル化した発泡剤を0.5重量%、無機発泡剤を1.0重量%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シートを製造した。
(高吸水性樹脂シートの特性評価)
(1)高吸水性樹脂シートの断面
本発明の実施例1による高吸水性樹脂シート単面の走査電子顕微鏡(SEM)写真を図1に示した。図1を参照すると、本発明の実施例1による高吸水性樹脂シートの表面には開気孔チャネル構造が形成されていることを確認することができる。
各実施例および比較例の高吸水性樹脂シートに対し、EDANA法WSP 241.2の方法により遠心分離保持能(CRC)を測定した。
各実施例および比較例の高吸水性樹脂シートを12cm*12cmの大きさに裁断した後にNaCl(0.9%)溶液27mlを吸収するのにかかる時間を測定した。
Claims (10)
- 酸性基を有し、前記酸性基の少なくとも一部が中和したアクリル酸系単量体、ポリエチレングリコール(メチルエーテル)(メタ)アクリレート(Polyethylene glycol (methyl ether) (meth)acrylate)を含む共単量体、内部架橋剤、カプセル化した発泡剤、平均粒径1〜100nmの無機発泡剤、および重合開始剤を混合してモノマー組成物を製造する段階;
前記モノマー組成物を熱重合または光重合して含水ゲル重合体を形成する段階;および 前記含水ゲル重合体を乾燥して高吸水性樹脂シートを形成する段階;
を含む高吸水性樹脂シートの製造方法であって、
前記カプセル化した発泡剤は、平均粒径が2〜50μmであり、
前記カプセル化した発泡剤は、炭化水素を含むコアと前記コアを囲み、熱可塑性樹脂で形成されるシェルを含む構造を有し、
前記ポリエチレングリコール(メチルエーテル)(メタ)アクリレート(Polyethylene glycol (methyl ether) (meth)acrylate)は、前記アクリル酸系単量体100重量部に対して5〜40重量部で含まれ、
前記カプセル化した発泡剤と無機発泡剤は、3:1〜1:1の重量比で含まれる、高吸水性樹脂シートの製造方法。 - 前記カプセル化した発泡剤は、空気中の最大膨張比率が3〜15倍である、請求項1に記載の高吸水性樹脂シートの製造方法。
- 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ばれた1種以上である、請求項1または2に記載の高吸水性樹脂シートの製造方法。
- 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ばれた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1〜3のいずれかに記載の高吸水性樹脂シートの製造方法。
- 前記無機発泡剤は、炭酸カルシウム(CaCO3)、重炭酸ナトリウム(NaHCO3)、重炭酸アンモニウム(NH4HCO3)、炭酸アンモニウム((NH4)2CO3)、亜硝酸アンモニウム(NH4NO2)、ホウ素化水素ナトリウム(NaBH4)および炭酸ナトリウム(Na2CO3)の中から選ばれる1種以上である、請求項1〜4のいずれかに記載の高吸水性樹脂シートの製造方法。
- 前記無機発泡剤の粒径は、2〜90nmである、請求項1〜5のいずれかに記載の高吸水性樹脂シートの製造方法。
- 前記カプセル化した発泡剤と無機発泡剤は、2:1〜1:1の重量比で含まれる、請求項1〜6のいずれかに記載の高吸水性樹脂シートの製造方法。
- 前記カプセル化した発泡剤は、前記アクリル酸系単量体100重量部に対して0.1〜20重量部で含まれる、請求項1〜7のいずれかに記載の高吸水性樹脂シートの製造方法。
- 前記無機発泡剤は、前記アクリル酸系単量体100重量部に対して0.1重量部以上含まれる、請求項1〜8のいずれかに記載の高吸水性樹脂シートの製造方法。
- 前記カプセル化した発泡剤および無機発泡剤は、前記アクリル酸系単量体100重量部に対して0.4〜20重量部で含まれる、請求項1〜9のいずれかに記載の高吸水性樹脂シートの製造方法。
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Application Number | Priority Date | Filing Date | Title |
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KR10-2018-0054365 | 2018-05-11 | ||
KR20180054365 | 2018-05-11 | ||
KR1020190049878A KR102202059B1 (ko) | 2018-05-11 | 2019-04-29 | 고흡수성 수지 시트의 제조 방법 |
KR10-2019-0049878 | 2019-04-29 | ||
PCT/KR2019/005223 WO2019216592A1 (ko) | 2018-05-11 | 2019-04-30 | 고흡수성 수지 시트의 제조 방법 |
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JP2020534416A JP2020534416A (ja) | 2020-11-26 |
JP6989695B2 true JP6989695B2 (ja) | 2022-01-05 |
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EP (1) | EP3677622B1 (ja) |
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