JP6464463B2 - 吸水性樹脂架橋剤 - Google Patents
吸水性樹脂架橋剤 Download PDFInfo
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- JP6464463B2 JP6464463B2 JP2016508794A JP2016508794A JP6464463B2 JP 6464463 B2 JP6464463 B2 JP 6464463B2 JP 2016508794 A JP2016508794 A JP 2016508794A JP 2016508794 A JP2016508794 A JP 2016508794A JP 6464463 B2 JP6464463 B2 JP 6464463B2
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- Prior art keywords
- water
- absorbing
- agent
- absorbent resin
- present
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 description 1
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- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- YFHICDDUDORKJB-UHFFFAOYSA-N trimethylene carbonate Chemical compound O=C1OCCCO1 YFHICDDUDORKJB-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Description
紙オムツ等の衛生用品で用いられる吸水性樹脂は、常圧下はもちろんのこと、体圧がかかった状態(圧力下)でも、高い吸水能力が求められる。
該架橋剤として、従来、エポキシ基を有する化合物が使われていた。しかしながら、エポキシ基を有する化合物を含む架橋剤は皮膚刺激性への問題等が懸念された。そこで、エポキシ基を有する化合物を含まない架橋剤が提案された。そのような架橋剤として、例えば、分子中にハロヒドリン基を少なくとも2つ有する化合物や、分子中にハロヒドリン基及び第四級アンモニウム基を有する化合物を含む架橋剤を挙げることができる(特許文献1参照)。また、分子内に複数のアミド骨格又はオキサゾール骨格を持つ多価アルコールを含む架橋剤も挙げることができる(特許文献2参照)。これら架橋剤でも、エポキシ基を有する化合物を含む架橋剤と同等の吸水能力を吸水性樹脂粒子に与えている。
[1]次の一般式(1):
で表されるハロヒドリン基を分子中に1つ有するハロヒドリン化合物を含むことを特徴とする吸水性樹脂架橋剤。
で表される化合物である、前記[1]又は[2]に記載の吸水性樹脂架橋剤。
まず、本発明の吸水性樹脂架橋剤(以下、「本発明架橋剤」という)について詳述する。
I−1.本発明に係るハロヒドリン化合物
で表されるハロヒドリン基を分子中に1つ有するハロヒドリン化合物を含むものである。
本発明に係るハロヒドリン化合物の好ましい具体例としては、次の一般式(2):
で表される化合物を挙げることができる。
また、エピハロヒドリンの使用量が前記範囲内の場合、未反応のエピハロヒドリンの残存量が少ないため、安全性に優れた吸水剤を得ることができる。
反応温度は、原料であるm+1価の脂肪族アルコールやエピハロヒドリン、ルイス酸触媒等によって異なるが、30℃〜95℃が適当である。反応時間は、原料であるm+1価の脂肪族アルコールやエピハロヒドリン、ルイス酸触媒等によって異なるが、1時間〜8時間が適当である。
本発明架橋剤により、カルボン酸基及び/又はカルボン酸塩基を有する吸水性樹脂(後述)の表面を効率的に架橋し、吸水能力の高い吸水剤を製造することができる。このため、吸水性樹脂の表面架橋剤として好適に使用できるものである。また、必要に応じて、本発明架橋剤により吸水性樹脂の内部を架橋することもできる。
るつぼ型ガラスフィルター(内径40mm、高さ70mm)を鉛直に立て、この中に前記評価に用いる吸水剤1gを均一に入れる。この吸水剤の上にPETフィルム(厚さ100μm)をのせ、初期重量を測定する。更にこの上に50g/cm2荷重となるように外径38mmの分銅を載せる。次に、生理食塩水(濃度0.9%)約630gを入れたバット(縦210mm、横170mm)の中に前記評価に用いる吸水剤を入れたるつぼ型ガラスフィルターを、底部を下側にして30分間浸漬した後、引き上げて、重量増加を測定する。この重量増加を吸水倍率とする。
次に、本発明架橋剤で得られる吸水剤(以下、「本発明吸水剤」という)について詳述する。
カルボン酸基及び/又はカルボン酸塩基を有する吸水性樹脂の表面を本発明架橋剤により架橋する場合について説明する。
これら公知の表面架橋剤は、1種であっても、2種以上の併用でもよい。
本発明架橋剤による吸水性樹脂の架橋によって製造した吸水剤(本発明吸水剤)の加圧下の吸水性能は以下のようにして評価した。
るつぼ型ガラスフィルター(内径40mm、高さ70mm)を鉛直に立て、この中に吸水剤1gを均一に入れた。この吸水剤の上にPETフィルム(厚さ100μm)をのせ、初期重量Wa(g)を測定した。更にこの上に50g/cm2荷重となるように外径38mmの分銅をのせた。次に、生理食塩水(濃度0.9%)約630gを入れたバット(縦210mm、横170mm)の中に、前記吸水剤を入れたるつぼ型ガラスフィルターを底部を下側にして30分間浸漬した後、引き上げて吸水後の重量Wb(g)を測定した。これらWa、Wbから、次式に従って加圧下の吸水倍率を算出した。
加圧下の吸収倍率=(Wb(g)−Wa(g))/吸水剤の重量(g)
実施例1
300mL容量セパラブルフラスコにエチレングリコール50g(0.8モル)、触媒として三フッ化ホウ素エーテル錯体0.3gを仕込み、加熱攪拌し、内温を50℃〜60℃に保ちながら、これにエピクロロヒドリン74.5g(0.8モル)を滴下した。滴下終了時、反応系は均一な溶液であった。滴下終了後、前記と同じ温度で攪拌し、滴定によるエポキシ基の定量に基づいてエピクロロヒドリンの消失を確認して、反応を終了させた。反応終了後、同温度範囲でイオン交換水1.4gを加え、一般式(2)において、Xが塩素原子であり、R2がエチレン基であり、m=1であるハロヒドリン化合物を含む本発明架橋剤(A1)を得た。
1L容量セパラブルフラスコにグリセリン200g(2.2モル)、触媒として四塩化すず0.9gを仕込み、加熱攪拌し、内温を70℃〜75℃に保ちながら、これにエピクロロヒドリン221g(2.4モル)を滴下した。滴下終了時、反応系は均一な溶液であった。滴下終了後、内温を90℃〜95℃に加温し、同温度範囲で撹拌を続け、滴定によるエポキシ基の定量に基づいてエピクロロヒドリンの消失を確認して、反応を終了させた。反応終了後、同温度範囲でイオン交換水280g、48.7%水酸化ナトリウム水溶液0.3gを加え、減圧濃縮により溶媒を留去した。濃縮残渣にイソプロピルアルコール281gを加え、ろ過を行い、一般式(2)において、Xが塩素原子であり、R2がイソプロピレン基であり、m=2であるハロヒドリン化合物を含む本発明架橋剤(A2)を得た。
300mL容量セパラブルフラスコにグリセリン220g(2.4モル)、触媒として三フッ化ホウ素エーテル錯体0.3gを仕込み、加熱攪拌し、内温を50℃〜55℃に保ちながら、これにエピクロロヒドリン486g(5.3モル)を滴下した。滴下終了時、反応系は均一な溶液であった。滴下終了後、前記と同じ温度で攪拌し、滴定によるエポキシ基の定量に基づいてエピクロロヒドリンの消失を確認して、反応を終了させた。反応終了後、同温度範囲でイオン交換水235g、48.7%水酸化ナトリウム水溶液0.2gを加え、減圧濃縮により溶媒を留去した。濃縮残渣にイソプロピルアルコール471gを加え、ろ過を行い、一般式(1)において、Aがメチレン基であり、R1が水素原子であり、Xが塩素原子であるハロヒドリン基を分子中に2つ有するハロヒドリン化合物を含む架橋剤(A3)を得た。
実施例3
実施例1で得られた本発明架橋剤(A1)0.1g(固形分換算)を水0.5gで希釈して水溶液を調製した(1%/吸水性樹脂粒子)。同様に、本発明架橋剤(A1)0.2g(固形分換算)を水1.0gで希釈して水溶液を調製した(2%/吸水性樹脂粒子)。
前記架橋剤水溶液をそれぞれポリアクリル酸塩系吸水性樹脂粒子10gに噴霧し、混合した。このように処理した吸水性樹脂粒子を150℃で60分間加熱して、本発明吸水剤を得た。この本発明吸水剤の性能を表1に示す。
本発明架橋剤(A1)に代えて、実施例2で得られた本発明架橋剤(A2)0.1g(固形分換算)、0.2g(固形分換算)をそれぞれ用いた以外は、実施例3と同様にして本発明吸水剤を得た。その性能を表1に示す。
本発明架橋剤(A1)に代えて、参考例1で得られた架橋剤(A3)0.1g(固形分換算)、0.2g(固形分換算)をそれぞれ用いた以外は、実施例3と同様にして吸水剤を得た。その性能を表1に示す。
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AU658061B2 (en) * | 1992-06-08 | 1995-03-30 | Hoechst Celanese Corporation | Novel cross-linked water-absorbent resin |
IT1267496B1 (it) * | 1994-11-10 | 1997-02-05 | P & G Spa | Polimero cationico, ad esempio di tipo superassorbente, procedimento ed uso relativi. |
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JP4844783B2 (ja) | 2001-07-05 | 2011-12-28 | ナガセケムテックス株式会社 | 架橋剤およびそれを用いた吸水性樹脂 |
MXPA06004345A (es) | 2003-11-07 | 2006-06-27 | Nippon Catalytic Chem Ind | Composicion de resina absorbente de agua en particulas y su proceso de produccion. |
DE102005018924A1 (de) * | 2005-04-22 | 2006-10-26 | Stockhausen Gmbh | Wasserabsorbierende Polymergebilde mit verbesserten Absorptionseigenschaften |
US8546492B2 (en) | 2008-04-11 | 2013-10-01 | Nippon Shokubai, Co., Ltd. | Surface treatment method for water-absorbing resin and production method for water-absorbing resin |
CN102245218B (zh) * | 2008-12-19 | 2014-10-22 | Sca卫生用品公司 | 包含超吸收聚合物和纤维素纳米纤丝的超吸收聚合物复合物 |
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EP3121221B1 (en) | 2019-03-06 |
JPWO2015141780A1 (ja) | 2017-04-13 |
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