JP7034537B2 - 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
本出願は、2019年1月11日付の韓国特許出願第10-2019-0004155号に基づく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。
下記化学式1で表される化合物を含む内部架橋剤、カプセル化された発泡剤および重合開始剤の存在下で、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状重合体を形成する段階と;
前記含水ゲル状重合体を乾燥および粉砕して粉末形態のベース樹脂を形成する段階と;
前記ベース樹脂を熱処理する段階と、を含み、
前記カプセル化された発泡剤は、前記水溶性エチレン系不飽和単量体100重量部に対して0.1~0.4重量部で使用される:
R-COOM1
R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価の金属、アンモニウム基または有機アミン塩である。
カプセル化された発泡剤の用意
実施例で使用されるカプセル化された発泡剤として、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なる、Matsumoto社で製造したF-36Dを用意した。このとき、全体カプセル化された発泡剤の重量に対してコアは25重量%で含まれ、F-36Dの発泡開始温度(Tstart)は70℃~80℃であり、最大発泡温度(Tmax)は110℃~120℃である。
ガラス反応器にアクリル酸100g、32重量%苛性ソーダ(NaOH)溶液123.5g、内部架橋剤として3-メチルブタン-1,3-ジイルジアクリレート(MBDA)0.2g、前記用意されたカプセル化された発泡剤F-36D 0.33g、熱重合開始剤として過硫酸ナトリウム0.2g、光重合開始剤として(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を水に投入した後、メカニカルミキサー(mechanical mixer)を用いて500rpmの速度で約10分間混合して、全体固形分濃度が45.0重量%の単量体組成物を製造した。
実施例1での内部架橋剤、カプセル化された発泡剤の含有量および熱処理条件を下記表1のとおり変更したことを除いては実施例1と同様の方法で、高吸水性樹脂を製造した。
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、以下の方法で遠心分離保水能(CRC)、吸収速度および微粉発生量に対して下記の方法で測定し、その結果を下記表1に示す。
各樹脂の無荷重下吸収倍率による保水能をヨーロッパ不織布工業会(European Disposables and Nonwovens Association、EDANA)の規格EDANA WSP 241.3により測定した。
CRC(g/g)={[W2(g)-W1(g)]/W0(g)}-1
W0(g)は、高吸水性樹脂の初期重量(g)であり、W1(g)は、高吸水性樹脂を使用せず、生理食塩水に30分間浸水して吸収させた後、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、常温で生理食塩水に高吸水性樹脂を30分間浸水して吸収させた後、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。
前記実施例および比較例での高吸水性樹脂の吸水速度は、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した。
前記実施例および比較例での高吸水性樹脂の微粉発生量は、粉砕された粉末形態のベース樹脂の分級時に分級機に最初投入したベース樹脂の質量に対して100μm未満の粒径を有する樹脂の質量比で計算した。
Claims (10)
- 下記化学式1で表される化合物を含む内部架橋剤、カプセル化された発泡剤および重合開始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状重合体を形成する段階;
前記含水ゲル状重合体を乾燥および粉砕して粉末形態のベース樹脂を形成する段階;および
前記ベース樹脂を熱処理する段階を含み、
前記カプセル化された発泡剤は、前記水溶性エチレン系不飽和単量体100重量部に対して0.1~0.4重量部で使用され、
前記熱処理は100℃~200℃の温度で5分~90分間行われる、高吸水性樹脂の製造方法:
- 前記内部架橋剤は、上記化学式1中の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、内部架橋剤の総重量に対して上記化学式1で表される化合物を1~100重量%で含む、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、前記水溶性エチレン系不飽和単量体100重量部に対して0.1~0.6重量部で使用される、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。
- 前記カプセル化された発泡剤は、膨張前の平均直径が5~50μmである、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上に形成された熱可塑性樹脂からなるシェルを含むコア-シェル構造を有する、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で構成された群から選択される1種以上である、請求項6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で構成された群から選択される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6または7に記載の高吸水性樹脂の製造方法。
- 前記ベース樹脂の形成後熱処理段階前に、
表面架橋剤の存在下で前記ベース樹脂の表面を追加架橋して表面架橋層を形成する段階をさらに含む、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。 - 製造された高吸水性樹脂は、EDANA法WSP 241.3により測定した遠心分離保水能(CRC)が40~55g/gであり、ボルテックス(Vortex)法による吸水速度が48秒以下である、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。
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