JPWO2015016075A1 - 吸水性樹脂粒子の製造方法 - Google Patents
吸水性樹脂粒子の製造方法 Download PDFInfo
- Publication number
- JPWO2015016075A1 JPWO2015016075A1 JP2015529513A JP2015529513A JPWO2015016075A1 JP WO2015016075 A1 JPWO2015016075 A1 JP WO2015016075A1 JP 2015529513 A JP2015529513 A JP 2015529513A JP 2015529513 A JP2015529513 A JP 2015529513A JP WO2015016075 A1 JPWO2015016075 A1 JP WO2015016075A1
- Authority
- JP
- Japan
- Prior art keywords
- water
- resin particles
- absorbent resin
- fatty acid
- tall oil
- 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.)
- Granted
Links
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 54
- 230000002745 absorbent Effects 0.000 title description 37
- 239000000178 monomer Substances 0.000 claims abstract description 86
- -1 fatty acid ester Chemical class 0.000 claims abstract description 50
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 41
- 239000000194 fatty acid Substances 0.000 claims abstract description 41
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- 238000009826 distribution Methods 0.000 claims abstract description 20
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/32—Polymerisation in water-in-oil emulsions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- 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
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/48—Surfactants
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- 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
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/20—Aqueous medium with the aid of macromolecular dispersing agents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/101—Esters; Ether-esters of monocarboxylic acids
- C08K5/103—Esters; Ether-esters of monocarboxylic acids with polyalcohols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/15—Heterocyclic compounds having oxygen in the ring
- C08K5/151—Heterocyclic compounds having oxygen in the ring having one oxygen atom in the ring
- C08K5/1535—Five-membered rings
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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
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- General Health & Medical Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
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Abstract
Description
(i)逆相懸濁重合の完了後の炭化水素分散媒中に分散した吸水性樹脂粒子の含水ゲル状物に対し、後架橋剤をそのまま添加する方法。
(ii)逆相懸濁重合の完了後の炭化水素分散媒中に分散した吸水性樹脂粒子の含水ゲル状物に対し、後架橋剤溶液を添加する方法。
(iii)乾燥工程を適用後の粉末状の吸水性樹脂粒子に対して攪拌下で後架橋剤または後架橋剤溶液をスプレー等により噴霧して混合する方法。
(ソルビタントール油脂肪酸エステルの合成)
攪拌装置、温度計、窒素ガス導入管および留出管を備えたガラス製4つ口フラスコを用意し、このフラスコにトール油脂肪酸(ハリマ化成株式会社の商品名「ハートールFA−1」)55g、70質量%D−ソルビトール水溶液37g、水酸化ナトリウム0.4gおよび亜リン酸0.3gを仕込んだ。フラスコの内容物を窒素ガス環境の常圧下で加熱し、220℃で6時間反応させた。反応終了後にろ過することで触媒を除去し、さらに水を留去したところ、78gのソルビタントール油脂肪酸エステルが得られた。
還流冷却器、滴下ロート、窒素ガス導入管、攪拌機および攪拌翼を備えた内径100mm、2L容の丸底円筒型セパラブルフラスコを準備した。攪拌翼は、翼径50mmの4枚傾斜パドル翼を2段で有するものを用いた。このセパラブルフラスコにn−ヘプタン321g(472mL)を入れ、これに分散安定剤として合成例1と同様の方法により得られたソルビタントール油脂肪酸エステル1.04g、および、高分子系分散安定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(三井化学株式会社の商品名「ハイワックス1105A」)0.92gを添加した。セパラブルフラスコの内容物を攪拌しつつ80℃まで昇温した後、65℃まで冷却した。
実施例1において準備したものと同様の丸底円筒型セパラブルフラスコを準備した。このセパラブルフラスコにn−ヘプタン321g(472mL)を入れ、これに分散安定剤として合成例1と同様の方法により得られたソルビタントール油脂肪酸エステル1.04g、および、高分子系分散安定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(三井化学株式会社の商品名「ハイワックス1105A」)0.92gを添加した。セパラブルフラスコの内容物を攪拌しつつ80℃まで昇温した後、65℃まで冷却した。
実施例1において準備したものと同様の丸底円筒型セパラブルフラスコを準備した。このセパラブルフラスコにn−ヘプタン321g(472mL)を入れ、これに分散安定剤としてテトラグリセリンステアリン酸エステル(三菱化学フーズ株式会社の商品名「リョートーポリグリTS−4」)0.92g、および、高分子系分散安定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(三井化学株式会社の商品名「ハイワックス1105A」)0.92gを添加した。セパラブルフラスコの内容物を攪拌しつつ80℃まで昇温した後、55℃まで冷却した。
実施例1において準備したものと同様の丸底円筒型セパラブルフラスコを準備した。このセパラブルフラスコにn−ヘプタン321g(472mL)を入れ、これに分散安定剤としてテトラグリセリンステアリン酸エステル(三菱化学フーズ株式会社の商品名「リョートーポリグリTS−4」)0.92g、および、高分子系分散安定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(三井化学株式会社の商品名「ハイワックス1105A」)0.92gを添加した。セパラブルフラスコの内容物を攪拌しつつ80℃まで昇温した後、55℃まで冷却した。
実施例1において準備したものと同様の丸底円筒型セパラブルフラスコを準備した。このセパラブルフラスコにシクロヘキサン378g(472mL)を入れ、これに分散安定剤としてソルビタンモノステアレート(花王株式会社の商品名「レオドールSP−10V」)0.92g、および、高分子系分散安定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(三井化学株式会社の商品名「ハイワックス1105A」)0.92gを添加した。セパラブルフラスコの内容物を攪拌しつつ80℃まで昇温した後、55℃まで冷却した。
実施例および比較例において得られた吸水性樹脂粒子について、生理食塩水保水能、中位粒子径および粒子径分布の均一度を測定した。測定方法は次の通りである。結果を表1に示す。
500mL容のビーカーに0.9質量%塩化ナトリウム水溶液(生理食塩水)500gを量り取り、600r/minで攪拌しながら吸水性樹脂粒子2.0gを添加してママコが発生しないように分散させた。攪拌状態で30分間放置し、吸水性樹脂粒子を十分に膨潤させた。膨潤した吸水性樹脂粒子を綿袋(メンブロード60番、横100mm×縦200mm)中に注ぎ込み、綿袋の上部を輪ゴムで縛った。そして、遠心力が167Gとなるよう設定した脱水機(国産遠心機株式会社の品番「H−122」)を用いて綿袋を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。また、生理食塩水へ吸水性樹脂粒子を添加せずに同じ操作をし、綿袋の湿潤時の空質量Wb(g)を測定した。次の式から吸水性樹脂粒子の生理食塩水保水能を算出した。
次の二種類の組み合わせの篩を用意した。
(A)JIS標準篩を上から、目開き500μmの篩、目開き250μmの篩、目開き180μmの篩、目開き150μmの篩、目開き106μmの篩、目開き75μmの篩、目開き45μmの篩および受け皿の順に組み合わせたもの。
(B)JIS標準篩を上から、目開き850μmの篩、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150μmの篩および受け皿の順に組み合わせたもの。
中位粒子径の測定において、積算質量百分率が15.9質量%に相当する粒子径(X1)および84.1質量%に相当する粒子径(X2)を求め、次の式により均一度を求めた。均一度は、1.0に近づくほど吸水性樹脂粒子の粒子径分布が狭いことを意味する。
Claims (8)
- 炭化水素分散媒中において、分散安定剤の存在下にラジカル重合開始剤を用いて水溶性エチレン性不飽和単量体を逆相懸濁重合する工程を含み、
前記分散安定剤がトール油脂肪酸エステルを含む、
吸水性樹脂粒子の製造方法。 - 前記トール油脂肪酸エステルが、ソルビトールトール油脂肪酸エステル、ソルビタントール油脂肪酸エステルおよびポリエチレングリコールトール油脂肪酸エステルからなる群より選ばれた少なくとも1種のものである、請求項1に記載の吸水性樹脂粒子の製造方法。
- 前記水溶性エチレン性不飽和単量体100質量部に対する前記分散安定剤の使用量を0.1〜30質量部に設定する、請求項1に記載の吸水性樹脂粒子の製造方法。
- 前記逆相懸濁重合を2段以上の多段で行う、請求項1に記載の吸水性樹脂粒子の製造方法。
- 逆相懸濁重合により得られた吸水性樹脂粒子を後架橋する工程をさらに含む、請求項1から4のいずれかに記載の吸水性樹脂粒子の製造方法。
- 水溶性エチレン性不飽和単量体を重合することで得られる、粒子径分布の均一度が3.0以下であり、かつ、生理食塩水保水能が20g/g以上である、吸水性樹脂粒子。
- 中位粒子径が20μm以上200μm未満である、請求項6に記載の吸水性樹脂粒子。
- 中位粒子径が200μm以上600μm以下である、請求項6に記載の吸水性樹脂粒子。
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