JP7118494B2 - 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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Description
前記含水ゲル重合体をゲル粉砕する段階;
前記ゲル粉砕された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で、前記ベース樹脂粉末を熱処理して表面架橋する段階を含み、
前記ゲル粉砕段階は、円筒形粉砕機の内部に装着されたスクリュー型押出機を利用して前記含水ゲル重合体を複数のホールが形成された多孔板に押し出しながら、下記計算式1によるチョッピング指数が28(/s)以上になる条件下で行われる、高吸水性樹脂の製造方法を提供する:
チョッピング指数(C.I.)=ω×(TSC/A)×チョッピング回数(T)
ωは前記スクリュー型押出機におけるスクリューの角速度(2π×N/60s)であり、ここで前記Nは前記スクリューの回転数(rpm)であり、TSCは前記粉砕機に投入された前記含水ゲル重合体の固形分含有量(%)であり、Aは前記多孔板の開口率(πr2×n/πR2)であり、ここで前記rは前記多孔板に形成されたホールの半径(mm)であり、前記nは前記多孔板に形成されたホールの個数であり、前記Rは前記多孔板の半径(mm)である。
前記含水ゲル重合体をゲル粉砕する段階;
前記ゲル粉砕された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で、前記ベース樹脂粉末を熱処理して表面架橋する段階を含み、
前記ゲル粉砕段階は、円筒形粉砕機の内部に装着されたスクリュー型押出機を利用して前記含水ゲル重合体を複数のホールが形成された多孔板に押し出しながら、下記計算式1によるチョッピング指数が28(/s)以上になる条件下で行われる、高吸水性樹脂の製造方法が提供される:
チョッピング指数(C.I.)=ω×(TSC/A)×チョッピング回数(T)
ωは前記スクリュー型押出機におけるスクリューの角速度(2π×N/60s)であり、ここで前記Nは前記スクリューの回転数(rpm)であり、TSCは前記粉砕機に投入された前記含水ゲル重合体の固形分含有量(%)であり、Aは前記多孔板の開口率(πr2×n/πR2)であり、ここで前記rは前記多孔板に形成されたホールの半径(mm)であり、前記nは前記多孔板に形成されたホールの個数であり、前記Rは前記多孔板の半径(mm)である。
R1-COOM1
R1は不飽和結合を含む炭素数2乃至5のアルキル基であり、
M1は水素原子、一価または二価金属、アンモニウム基または有機アミン塩である。
チョッピング指数(C.I.)=ω×(TSC/A)×チョッピング回数(T)
ωは前記スクリュー型押出機におけるスクリューの角速度(2π×N/60s)であり、ここで前記Nは前記スクリューの回転数(rpm)であり、TSCは前記粉砕機に投入された前記含水ゲル重合体の固形分含有量(%)であり、Aは前記多孔板の開口率(πr2×n/πR2)であり、ここで前記rは前記多孔板に形成されたホールの半径(mm)であり、前記nは前記多孔板に形成されたホールの個数であり、前記Rは前記多孔板の半径(mm)である。
高吸水性樹脂の製造装置としては、重合工程、含水ゲル粉砕工程、乾燥工程、粉砕工程、分級工程、表面架橋工程、冷却工程、分級工程、および各工程を連結する輸送工程から構成される連続製造装置を用いた。
チョッピング指数(C.I.)=ω×(TSC/A)×チョッピング回数(T)
ωは前記スクリュー型押出機におけるスクリューの角速度(2π×N/60s)であり、ここで前記Nは前記スクリューの回転数(rpm)であり、TSCは前記粉砕機に投入された前記含水ゲル重合体の固形分含有量(%)であり、Aは前記多孔板の開口率(πr2×n/πR2)であり、ここで前記rは前記多孔板に形成されたホールの半径(mm)であり、前記nは前記多孔板に形成されたホールの個数であり、前記Rは前記多孔板の半径(mm)である。
ゲル粉砕時、チョッピング指数およびその達成のための条件を下記表1のように別にしたことを除いては、実施例1と同様の方法で実施例2および3の高吸水性樹脂粒子を得た。
3-メチルブタン-1,3-ジイルジアクリレート(化学式1の化合物)を用いず、ポリエチレングリコールジアクリレート(PEGDA)0.24gを用いたことを除いては、実施例1と同様の方法で比較例1の高吸水性樹脂粒子を得た。
ポリエチレングリコールジアクリレート(PEGDA)の使用量を0.45gにしたことを除いては、比較例1と同様の方法で比較例2の高吸水性樹脂粒子を得た。
ゲル粉砕時、チョッピング指数およびその達成のための条件を下記表1のように別にしたことを除いては、実施例1と同様の方法で比較例3および4の高吸水性樹脂粒子を得た。
前記実施例および比較例で製造した各高吸水性樹脂の物性を次の方法で測定および評価した。
欧州不織布産業協会(European Disposables and Nonwovens Association、EDANA)規格EDANA WSP 241.3により無荷重下吸水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)}
実施例および比較例の高吸水性樹脂(またはベース樹脂粉末;以下同一)の吸水速度は、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 (12)
- 化学式1で表される内部架橋剤の存在下で、少なくとも一部が中和し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ゲル粉砕する段階;
前記ゲル粉砕された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で、前記ベース樹脂粉末を熱処理して表面架橋する段階を含み、
前記表面架橋剤は、エチレングリコール、プロピレングリコール、1,3-プロパンジオール、1,4-ブタンジオール、1,6-ヘキサンジオール、1,2-ヘキサンジオール、1,3-ヘキサンジオール、2-メチル-1,3-プロパンジオール、2,5-ヘキサンジオール、2-メチル-1,3-ペンタンジオール、2-メチル-2,4-ペンタンジオール、トリプロピレングリコールおよびグリセロールからなる群より選択された1種以上のポリオール;エチレンカーボネートおよびプロピレンカーボネートからなる群より選択された1種以上のアルキレンカーボネート系化合物;エチレングリコールジグリシジルエーテルのエポキシ化合物;オキサゾリジノンなどのオキサゾリン化合物;ポリアミン化合物;モノ-、ジ-またはポリオキサゾリジノン化合物;または環状ウレア化合物を含み、
前記ゲル粉砕段階は、円筒形粉砕機の内部に装着されたスクリュー型押出機を利用して前記含水ゲル重合体を複数のホールが形成された多孔板に押し出しながら、下記計算式1によるチョッピング指数が31乃至40(/s)になる条件下で行われる、高吸水性樹脂の製造方法:
[計算式1]
チョッピング指数(C.I.)=ω×(TSC/A)×チョッピング回数(T)
前記計算式1で、
ωは前記スクリュー型押出機におけるスクリューの角速度(2π×N/60s)であり、ここで前記Nは前記スクリューの回転数(rpm)であり、TSCは前記粉砕機に投入された前記含水ゲル重合体の固形分含有量(%)であり、Aは前記多孔板の開口率(πr2×n/πR2)であり、ここで前記rは前記多孔板に形成されたホールの半径(mm)であり、前記nは前記多孔板に形成されたホールの個数であり、前記Rは前記多孔板の半径(mm)である。 - 前記水溶性エチレン系不飽和単量体は、アクリル酸、メタクリル酸、無水マレイン酸、フマル酸、クロトン酸、イタコン酸、2-アクリロイルエタンスルホン酸、2-メタクリロイルエタンスルホン酸、2-(メタ)アクリロイルプロパンスルホン酸、または2-(メタ)アクリルアミド-2-メチルプロパンスルホン酸の陰イオン性単量体とその塩;(メタ)アクリルアミド、N-置換(メタ)アクリレート、2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、メトキシポリエチレングリコール(メタ)アクリレートまたはポリエチレングリコール(メタ)アクリレートの非イオン系親水性含有単量体;および(N,N)-ジメチルアミノエチル(メタ)アクリレートまたは(N,N)-ジメチルアミノプロピル(メタ)アクリルアミドのアミノ基含有不飽和単量体とその四級化物;からなる群より選択された1種以上の化合物を含む、請求項1に記載の高吸水性樹脂の製造方法。
- 前記内部架橋剤は、前記化学式1でR1がメタン-1,1-ジイル、プロパン-1,3-ジイル、プロパン-1,2-ジイル、プロパン-1,1-ジイル、n-ブタン-1,4-ジイル、n-ブタン-1,3-ジイル、n-ブタン-1,2-ジイル、n-ブタン-1,1-ジイル、2-メチルプロパン-1,3-ジイル、2-メチルプロパン-1,2-ジイル、2-メチルプロパン-1,1-ジイル、2-メチルブタン-1,4-ジイル、2-メチルブタン-2,4-ジイル、2-メチルブタン-3,4-ジイル、2-メチルブタン-4,4-ジイル、2-メチルブタン-1,3-ジイル、2-メチルブタン-1,2-ジイル、2-メチルブタン-1,1-ジイル、2-メチルブタン-2,3-ジイル、3-メチルブタン-1,2-ジイル、または3-メチルブタン-1,3-ジイルである化合物を含む、請求項1または2に記載の高吸水性樹脂の製造方法。
- 前記内部架橋剤は、内部架橋剤総重量に対して前記化学式1の化合物10乃至100重量%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の製造方法。
- 前記内部架橋剤は、N,N’-メチレンビスアクリルアミド、トリメチロールプロパントリ(メタ)アクリレート、エチレングリコールジ(メタ)アクリレート、ポリエチレングリコールジ(メタ)アクリレート、プロピレングリコールジ(メタ)アクリレート、ポリプロピレングリコールジ(メタ)アクリレート、ブタンジオールジ(メタ)アクリレート、ブチレングリコールジ(メタ)アクリレート、ジエチレングリコールジ(メタ)アクリレート、ヘキサンジオールジ(メタ)アクリレート、トリエチレングリコールジ(メタ)アクリレート、トリプロピレングリコールジ(メタ)アクリレート、テトラエチレングリコールジ(メタ)アクリレート、ジペンタエリスリトールペンタアクリレート、グリセリントリ(メタ)アクリレート、ペンタエリスリトールテトラアクリレート、トリアリルアミン、アリル(メタ)アクリレート、エチレングリコールジグリシジルエーテル、プロピレングリコール、グリセリン、およびエチレンカーボネートからなる群より選択された1種以上の追加内部架橋剤をさらに含む、請求項4に記載の高吸水性樹脂の製造方法。
- 前記内部架橋剤は、水溶性エチレン系不飽和単量体100重量部に対して0.01乃至5重量部で使用される、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。
- 前記分級段階後のベース樹脂粉末は、150乃至850μmの粒径を有する、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。
- 前記表面架橋剤は、シリカ(silica)、クレイ(clay)、アルミナ、シリカ-アルミナ複合材、チタニア、亜鉛酸化物およびアルミニウムスルフェートからなる群より選択された1種以上の無機物質をさらに含む、請求項1から7のいずれか一項に記載の高吸水性樹脂の製造方法。
- 前記表面架橋剤は、ベース樹脂100重量部に対して0.01乃至3重量部で使用される、請求項1から8のいずれか一項に記載の高吸水性樹脂の製造方法。
- 前記表面架橋段階の熱処理は、80℃乃至200℃の温度で20分乃至2時間行われる、請求項1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。
- 前記高吸水性樹脂は、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35乃至50g/gである、請求項1から10のいずれか一項に記載の高吸水性樹脂の製造方法。
- 前記高吸水性樹脂は、ボルテックス法による吸水速度が35乃至70秒になる、請求項5から11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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