JPWO2020122211A1 - 吸水性樹脂粒子 - Google Patents
吸水性樹脂粒子 Download PDFInfo
- Publication number
- JPWO2020122211A1 JPWO2020122211A1 JP2020559330A JP2020559330A JPWO2020122211A1 JP WO2020122211 A1 JPWO2020122211 A1 JP WO2020122211A1 JP 2020559330 A JP2020559330 A JP 2020559330A JP 2020559330 A JP2020559330 A JP 2020559330A JP WO2020122211 A1 JPWO2020122211 A1 JP WO2020122211A1
- Authority
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- Japan
- Prior art keywords
- water
- mass
- absorbent resin
- resin particles
- amount
- Prior art date
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- Granted
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- A—HUMAN NECESSITIES
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- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
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Abstract
Description
100mlビーカー内で600rpmで撹拌させた生理食塩水38g中に吸水性樹脂粒子2gを投入し、渦が消失した時点から25℃で30分間静置し、膨潤ゲルを作製する。12cm×10cmのEDANA WSP241.2R3(12)に規定される不織布製のティーバッグに上記膨潤ゲル20gを入れ、袋を閉じたものを評価サンプルとし、質量を測定する。篩の上に載せた上記評価サンプルを、35℃、内圧0.2kPaの真空乾燥機内に置き、1時間毎に上記評価サンプルの質量を測定する。
膨潤ゲル量(g/g)=(評価サンプル質量(g)−風袋質量(g))/測定する膨潤ゲルに含まれる吸水性樹脂粒子乾燥質量(g)
水分保持率(%)=(減圧後膨潤ゲル量(g/g)/初期膨潤ゲル量(g/g))×100
100mlビーカー内で600rpmで撹拌させた生理食塩水38g中に吸水性樹脂粒子2gを投入し、渦が消失した時点から25℃で30分間静置し、膨潤ゲルを作製する。12cm×10cmの、EDANA WSP241.2R3(12)に規定される不織布製のティーバッグに上記膨潤ゲル20gを入れ、袋を閉じたものを評価サンプルとし、初期値として質量を測定する。篩の上に載せた上記評価サンプルを、35℃、内圧0.2kPaの真空乾燥機内に置き、1時間毎に上記評価サンプルの質量を測定する。
膨潤ゲル量(g/g)=(評価サンプル質量(g)−風袋質量(g))/測定する膨潤ゲルに含まれる吸水性樹脂粒子乾燥質量(g)
水分保持率(%)=(減圧後膨潤ゲル量(g/g)/初期膨潤ゲル量(g/g))×100
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、撹拌機として、翼径5cmの4枚傾斜パドル翼を2段で有する撹拌翼を備えた内径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、撹拌しつつ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、撹拌機として、翼径5cmの4枚傾斜パドル翼を2段で有する撹拌翼を備えた内径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、撹拌しつつ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、撹拌機として、翼径5cmの4枚傾斜パドル翼を2段で有する撹拌翼を備えた内径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、撹拌しつつ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、撹拌機として、翼径5cmの4枚傾斜パドル翼を2段で有する撹拌翼を備えた内径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、撹拌しつつ80℃まで昇温して分散剤を溶解した後、50℃まで冷却した。
日本販売の大王製紙株式会社のおむつ「GOO.Nパンツ まっさらさら通気 男の子用 Lサイズ」から採取した吸水性樹脂粒子を比較例1とした。該粒子の中位粒子径は403μmであった。
還流冷却器、滴下ロート、窒素ガス導入管、及び撹拌機として翼径5cmの4枚傾斜パドル翼(フッ素樹脂にて表面処理したもの)を2段で有する撹拌翼を備えた、内径11cm、2L容の、4箇所の側壁バッフル付き丸底円筒型セパラブルフラスコ(バッフル幅:7mm)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451gを入れ、界面活性剤としてHLB8.6のソルビタンモノラウレート(日油株式会社、ノニオンLP−20R)0.984gを加え、撹拌機の回転数を300rpmとして、50℃まで加熱した。加熱によって、ソルビタンモノラウレートをn−ヘプタンに溶解させた後、内温を40℃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、撹拌機として、翼径5cmの4枚傾斜パドル翼を2段で有する撹拌翼を備えた内径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、撹拌しつつ80℃まで昇温して分散剤を溶解した後、50℃まで冷却した。
温度25±2℃の室内において、100mLビーカー内に入れた生理食塩水38gをマグネチックスターラーバー(8mmφ×30mm、リング無し)で600rpmに撹拌させつつ、吸水性樹脂粒子2gを投入し、撹拌による渦が消失した時点から、ビーカー上部を市販のラップ材で蓋をして25℃下で30分間静置し、膨潤ゲルを得た。日本製紙パピリア製ヒートパック(MWA18:18gsm、120mm×200mm)を二つ折りにして、折り目を除く三辺のうち二辺をヒートシールした120mm×100mmのティーバッグを作製し、風袋(空のティーバッグ)質量を測定した。上記ティーバッグに、スパチュラを用いて上記膨潤ゲル20.0gを詰めた後、ヒートシールで袋を閉じて評価サンプルとし、直ちに初期評価サンプル質量を測定した。いずれの例でも初期の膨潤ゲル量は20.0gであったため、評価サンプル中の吸水性樹脂粒子(乾燥)質量は1.0gとみなして下記の水分保持率の計算を行った。
膨潤ゲル量[g/g]=(評価サンプル質量[g]−風袋(ティーバッグ)質量[g])/評価サンプル中の吸水性樹脂粒子(乾燥)質量[g]
減圧6時間後の水分保持率[%]=(減圧6時間後の膨潤ゲル量[g/g]/初期膨潤ゲル量[g/g])×100
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Wa(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Wb(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)=[Wa−Wb]/2.0
吸水性樹脂粒子50gを中位粒子径(粒度分布)測定用に用いた。
プラスチックシャーレ(直径90mm×高さ20mm)に吸水性樹脂粒子1gを均一に撒き、25±1℃に調整した生理食塩水19gを滴下し、25±2℃の室内でプラスチックシャーレに蓋をして30分静置し、膨潤ゲルを作製した。
Claims (4)
- (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、下記測定方法により行う減圧下水分保持試験において、水分保持率6時間値が55質量%以上であり、生理食塩水保水量が32〜70g/gである、吸水性樹脂粒子。
100mlビーカー内で600rpmで撹拌させた生理食塩水38g中に吸水性樹脂粒子2gを投入し、渦が消失した時点から25℃で30分間静置し、膨潤ゲルを作製する。12cm×10cmのEDANA WSP241.2R3(12)に規定される不織布製のティーバッグに前記膨潤ゲル20gを入れ、袋を閉じたものを評価サンプルとし、質量を測定する。篩の上に載せた前記評価サンプルを、35℃、内圧0.2kPaの真空乾燥機内に置き、1時間毎に前記評価サンプルの質量を測定する。
膨潤ゲル量(g/g)=(評価サンプル質量(g)−風袋質量(g))/測定する膨潤ゲルに含まれる吸水性樹脂粒子乾燥質量(g)
水分保持率(%)=(減圧後膨潤ゲル量(g/g)/初期膨潤ゲル量(g/g))×100 - 請求項1に記載の吸水性樹脂粒子を含有する、吸収体。
- 請求項2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3に記載の吸収性物品。
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