JP6754460B2 - 吸水性樹脂粒子 - Google Patents
吸水性樹脂粒子 Download PDFInfo
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Description
溶解分(質量%)=[((Wa−Wb)/80)×500/2]×100
生理食塩水保水量(g/g)=(Wc−Wd)/2
含水率=[Ww/(Ww+Ws)]×100
Ww:全重合工程の重合前の水性液に含まれる水分量から、乾燥工程により系外部に排出された水分量を差し引いた量に、粉末状無機凝集剤、表面架橋剤等を混合する際に必要に応じて用いられる水分量を加えた含水ゲル状重合体の水分量。
Ws:含水ゲル状重合体を構成するエチレン性不飽和単量体、架橋剤、開始剤等の材料の仕込量から算出される固形分量。
(実施例1)
還流冷却器、滴下ロート、窒素ガス導入管、及び、攪拌機として、翼径5cmの4枚傾斜パドル翼を2段で有する攪拌翼を備えた、内径11cm、2L容の丸底円筒型セパラブルフラスコを準備した。このフラスコに、炭化水素分散媒としてn−ヘプタン293gをとり、高分子系分散剤として無水マレイン酸変性エチレン・プロピレン共重合体(三井化学株式会社、ハイワックス1105A)0.736gを添加し、攪拌しつつ80℃まで昇温して分散剤を溶解した後、50℃まで冷却した。
還流冷却器、滴下ロート、窒素ガス導入管、及び、攪拌機として、翼径5cmの4枚傾斜パドル翼を2段で有する攪拌翼を備えた、内径11cm、2L容の丸底円筒型セパラブルフラスコを準備した。このフラスコに、炭化水素分散媒としてn−ヘプタン293gをとり、高分子系分散剤として無水マレイン酸変性エチレン・プロピレン共重合体(三井化学株式会社、ハイワックス1105A)0.736gを添加し、攪拌しつつ80℃まで昇温して分散剤を溶解した後、50℃まで冷却した。
還流冷却器、滴下ロート、窒素ガス導入管、及び、攪拌機として、翼径5cmの4枚傾斜パドル翼を2段で有する攪拌翼を備えた内径11cm、2L容の丸底円筒型セパラブルフラスコを準備した。このフラスコに、炭化水素分散媒としてn−ヘプタン293gをとり、高分子系分散剤として無水マレイン酸変性エチレン・プロピレン共重合体(三井化学株式会社、ハイワックス1105A)0.736gを添加し、攪拌しつつ80℃まで昇温して分散剤を溶解した後、50℃まで冷却した。
還流冷却器、滴下ロート、窒素ガス導入管、及び、攪拌機として、翼径5cmの4枚傾斜パドル翼を2段で有する攪拌翼を備えた内径11cm、2L容の丸底円筒型セパラブルフラスコを準備した。このフラスコに、炭化水素分散媒としてn−ヘプタン293gをとり、高分子系分散剤として無水マレイン酸変性エチレン・プロピレン共重合体(三井化学株式会社、ハイワックス1105A)0.736gを添加し、攪拌しつつ80℃まで昇温して分散剤を溶解した後、50℃まで冷却した。
得られた吸水性樹脂粒子4gを、小型粉砕機(Wonder Blender WB−1)に付属の微粉砕フタ(型番:PN−W03)を装着した状態で15秒間粉砕し、粉砕粒子を得た。所定量の粉砕粒子が得られるまで、上記操作を繰り返した。
粉砕前の吸水性樹脂粒子については、JIS標準篩を上から、目開き600μmの篩、目開き500μmの篩、目開き425μmの篩、目開き300μmの篩、目開き250μmの篩、目開き180μmの篩、目開き150μmの篩、及び受け皿の順に組み合わせた。
500mLビーカーに0.9質量%NaCl水溶液500gを入れ、攪拌子(8mmφ×30mmのリング無し)をビーカーに入れ、600rpmで回転するように調整した。吸水性樹脂粒子又は粉砕粒子2.000gを上記ビーカーに入れ、25℃で3時間攪拌した後、75μm標準篩でろ過し、ろ液を回収した。桐山式ロート(ろ紙:ADVANTEC、No.6)を用いてろ液を更に吸引ろ過した。得られたろ液を、事前に140℃で恒量した100mLビーカーに80g量り取り、140℃の熱風乾燥機(ADVANTEC社製、FV−320)で15時間乾燥させ、ろ過固形分の質量Wa(g)を測定した。粒子を用いずに上記操作を同様に行い、ろ液固形分Wb(g)を測定し、以下の式により溶解分を算出した。
溶解分(質量%)=[((Wa−Wb)/80)×500/2]×100
測定は温度25℃、湿度60±10%の環境下で行なわれた。100mLビーカーに25±1℃の0.9質量%塩化ナトリウム水溶液50gを入れ、攪拌子(8mmφ×30mm、リングなし)を用いて回転数600rpmで攪拌しながら、吸水性樹脂粒子1.0gを入れ、粒子を膨潤させ、膨潤ゲルを得た。トレイの上にろ紙1(ADVANTEC No.51A、15×15cm)を載せ、ろ紙1の上に10cm×10cmの開口部を有するアクリル樹脂製ガイド枠を置き、枠の中に、ビーカー内の膨潤ゲル全量を均一に散布した。散布した膨潤ゲルの上に、秤量済みのろ紙2(ADVANTEC、No.51A、9.8cm×9.8cm)を置いた。さらに、ろ紙2の上に膨潤ゲルの余剰水を吸収するため、同サイズのろ紙(ADVANTEC、No.51A、9.8cm×9.8cm)19枚を重ねて置いた。上記ガイド枠の内側に沿って、ろ紙の上から1.0kgの重り(9.8cm×9.8cm)を載せた。1分後に重りを外し、次いで上記ガイド枠を取り外した。上部に重ねて置いたろ紙19枚を外し、ろ紙2を膨潤ゲルからゆっくりと剥がし、膨潤ゲルの一部が付着したろ紙2の質量を測定した。荷重後のろ紙2の質量(g)から、荷重前のろ紙2の質量を差し引くことにより、ろ紙2に付着した膨潤ゲルの質量を算出し、べたつきの評価の指標とした。すなわち、ろ紙2に付着した膨潤ゲルが多いほどべたつきが生じやすく、ろ紙2に付着した膨潤ゲルが少ないほどべたつきが生じにくい。
吸水性樹脂粒子2.0gを量り取った綿袋(メンブロード60番、横100mm×縦200mm)を500mL容のビーカー内に設置した。吸水性樹脂粒子の入った綿袋中に0.9質量%塩化ナトリウム水溶液(生理食塩水)500gをママコができないように一度に注ぎ込み、綿袋の上部を輪ゴムで縛り、30分静置させることで吸水性樹脂粒子を膨潤させた。30分経過後の綿袋を、遠心力が167Gとなるよう設定した脱水機(株式会社コクサン製、品番:H−122)を用いて1分間脱水し、脱水後の膨潤ゲルを含んだ綿袋の質量Wc(g)を測定した。吸水性樹脂粒子を添加せずに同様の操作を行い、綿袋の湿潤時の空質量Wd(g)を測定し、以下の式から生理食塩水保水量を算出した。
生理食塩水保水量(g/g)=[Wc−Wd]/2.00
Claims (8)
- (メタ)アクリル酸及びその塩からなる群より選ばれる少なくとも1種の化合物を含むエチレン性不飽和単量体に由来する構造単位を有する架橋重合体を含む吸水性樹脂粒子であって、(メタ)アクリル酸及びその塩の割合が前記架橋重合体中の単量体単位全量に対して70〜100モル%であり、
下記方法で測定される、前記吸水性樹脂粒子の溶解分が10質量%以上40質量%以下であり、中位粒子径が80〜165μmになるように粉砕されたときの溶解分が15質量%以上40質量%以下である、吸水性樹脂粒子。
溶解分測定方法:
500mLビーカーに0.9質量%NaCl水溶液500gを入れ600rpmで攪拌させる。吸水性樹脂粒子又は粉砕粒子2gを該ビーカーに入れ、25℃で3時間攪拌した後、75μm標準篩でろ過し、ろ液を回収する。得られたろ液を、JIS P3801に定められた第6種のろ紙を用いて更に吸引ろ過する。吸引ろ過して得られたろ液を、秤量済みの100mLビーカーに80g量り取り、140℃の熱風乾燥機で15時間乾燥させ、ろ過固形分の質量Wa(g)を測定する。粒子を用いずに前記操作を同様に行い、ろ液固形分Wb(g)を測定し、以下の式により溶解分を算出する。
溶解分(質量%)=[((Wa−Wb)/80)×500/2]×100 - 中位粒子径が250〜600μmである、請求項1に記載の吸水性樹脂粒子。
- 300μm以下の粒子径を有する粒子の割合が、前記吸水性樹脂粒子全量に対して55質量%以下である、請求項1又は2に記載の吸水性樹脂粒子。
- 前記中位粒子径が80〜165μmになるように粉砕されたときの溶解分が、300μm以下の粒子径を有する粒子が吸水性樹脂粒子全量に対して70質量%以上になるように粉砕されたときの値である、請求項1〜3のいずれか一項に記載の吸水性樹脂粒子。
- 生理食塩水保水量が20〜70g/gである、請求項1〜4のいずれか一項に記載の吸水性樹脂粒子。
- 請求項1〜5のいずれか一項に記載の吸水性樹脂粒子を含有する、吸収体。
- 請求項6に記載の吸収体を備える、吸収性物品。
- おむつである、請求項7に記載の吸収性物品。
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