JP6814885B2 - 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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- JP6814885B2 JP6814885B2 JP2019531815A JP2019531815A JP6814885B2 JP 6814885 B2 JP6814885 B2 JP 6814885B2 JP 2019531815 A JP2019531815 A JP 2019531815A JP 2019531815 A JP2019531815 A JP 2019531815A JP 6814885 B2 JP6814885 B2 JP 6814885B2
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- fine powder
- water
- absorbent resin
- producing
- granulated material
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- 239000002689 soil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- VPYJNCGUESNPMV-UHFFFAOYSA-N triallylamine Chemical compound C=CCN(CC=C)CC=C VPYJNCGUESNPMV-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
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- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/245—Differential crosslinking of one polymer with one crosslinking type, e.g. surface crosslinking
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- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/075—Macromolecular gels
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- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
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- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/14—Water soluble or water swellable polymers, e.g. aqueous gels
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- C08J2333/00—Characterised by the use of homopolymers or 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 of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/04—Characterised by the use of homopolymers or 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 of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2333/06—Characterised by the use of homopolymers or 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 of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2333/08—Homopolymers or copolymers of acrylic acid esters
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Description
本出願は、2018年1月16日付韓国特許出願第10−2018−0005708号に基づいた優先権の利益を主張し、該当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。
《高吸水性樹脂粒子の製造》
(製造例)
アクリル酸100g、架橋剤としてポリエチレングリコールジアクリレート0.3g、開始剤として過硫酸ナトリウム0.033g、苛性ソーダ(NaOH)38.9g、および水103.9gの比率で混合し、単量体濃度が50重量%である単量体混合物を準備した。
(比較例1)
前記製造例1で製造された高吸水性樹脂のうちの150μm以下の粒径を有する微粉100gをミキサー(Mixer)に入れ、650rpmで攪拌しながら水5gを投入した後、1分間混合して微粉再造粒体を得た。この時の写真を図1の左側に示し、肉眼上で水と混合されない微粉が観察された。
再造粒過程で水10gを使用したことを除いて、比較例1と同様な方法で微粉再造粒体を製造した。再造粒後の写真を図2の左側写真で示し、水と混合されなかった微粉が観察された。
再造粒過程で水20gを使用したことを除いて、比較例1と同様な方法で微粉再造粒体を製造した。再造粒後の写真を図3の左側写真で示し、水と混合されていない微粉が観察されなかった。
再造粒過程で水40gを使用したことを除いて、比較例1と同様な方法で微粉再造粒体を製造した。再造粒後の写真を図4の左側写真で示し、水と混合されていない微粉が観察されなかった。
再造粒過程で水120gを使用したことを除いて、比較例1と同様な方法で微粉再造粒体を製造した。再造粒後の写真を図5の左側写真で示し、水と混合されていない微粉が観察されなかった。
前記製造例1で製造された高吸水性樹脂のうちの150μm以下の粒径を有する微粉100gをミキサーに入れ、650rpmで攪拌しながら水20gを投入した後、1分間混合して微粉再造粒体を得た。
圧搾過程でチョッパから吐出される圧搾微粉再造粒体の温度を75℃に制御したことを除いては実施例1と同様な方法で微粉再造粒体および圧搾微粉再造粒体を製造した。
前記製造例1で製造された高吸水性樹脂のうちの150μm以下の粒径を有する微粉100gをミキサーに入れ、650rpmで攪拌しながら水120gを投入した後、1分間混合して微粉再造粒体を得た。
前記製造例1で製造された高吸水性樹脂のうちの150μm以下の粒径を有する微粉100gをミキサーに入れ、650rpmで攪拌しながら水20gを投入した後、1分間混合して微粉再造粒体を得た。
(圧搾)微粉再造粒体の物性を評価するために前記比較例3、5、実施例1および2で製造した(圧搾)微粉再造粒体を分級した後、300μm以上600μm未満の粒径を有する再造粒体に対して下記方法で物性を測定し、その結果を表1に示した。
保水能の測定はEDANA法WSP241.3を基準にした。準備された微粉再造粒体のうちの粒径300μm以上600μm未満の試料0.2gをティーバッグに入れて0.9%塩水溶液に30分間浸漬する。その後、250G(gravity)の遠心力で3分間脱水した後、塩水溶液が吸収された量W2(g)を測定した。また、圧搾微粉再造粒体を使用せず同一な操作をした後にその時の質量W1(g)を測定した。
このように得られた各質量を用いて下記の計算式1によってCRC(g/g)を算出して保水能を確認した。
[数式1]
CRC(g/g)={[W2(g)−W1(g)]/W0(g)}−1
上記計算式1中、
W0(g)は、圧搾微粉再造粒体の初期重量(g)であり、
W1(g)は、圧搾微粉再造粒体を使用せず、遠心分離機を使用して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0.9重量%生理食塩水に圧搾微粉再造粒体を30分間浸漬して吸収させた後、遠心分離機を使用して250Gで3分間脱水した後に、圧搾微粉再造粒体を含んで測定した装置重量である。
圧搾微粉再造粒体に対して吸水速度を測定した。吸水速度の測定は、50ml食塩水を100mlビーカーにマグネチックバーと共に入れた。攪拌機を使用して攪拌速度を600rpmに指定した。攪拌されている食塩水に2.0gの圧搾微粉再造粒体を入れると同時に時間を測定した。ビーカー内にうず巻きがなくなる時点に時間測定を終了した。
Claims (9)
- 水溶性エチレン系不飽和単量体および重合開始剤を含むモノマー組成物に熱重合または光重合を行って含水ゲル状重合体を製造する段階;
前記含水ゲル状重合体を乾燥および粉砕して150μm以下の粒径を有する微粉、および150μm超過850μm以下の粒径を有する正常粒子に分級する段階;
前記微粉を水と混合し、再造粒して微粉再造粒体を製造する段階;および
前記微粉再造粒体を圧搾、粉砕および分級して、圧搾微粉再造粒体を製造する段階を含み、
前記微粉再造粒体段階では、前記微粉の100重量部に対して1〜20重量部の水を使用し、
前記圧搾微粉再造粒体製造段階は、前記微粉再造粒体を40〜105℃の温度で圧搾する段階を含み、
前記圧搾は、前記微粉再造粒体を圧搾および切断するチョッパ(chopper)で行われる、高吸水性樹脂の製造方法。 - 前記微粉再造粒体製造段階は、前記微粉と水をせん断力印加可能な混合装置で混合する段階を含む、請求項1に記載の高吸水性樹脂の製造方法。
- 前記圧搾微粉再造粒体製造段階は、前記圧搾と、粉砕の間に乾燥段階をさらに含む、請求項1または2に記載の高吸水性樹脂の製造方法。
- 前記乾燥は、120〜220℃で行われる、請求項3に記載の高吸水性樹脂の製造方法。
- 前記圧搾微粉再造粒体製造段階は、前記圧搾および粉砕された微粉再造粒体を150μm以下の粒径を有する再造粒体微粉、および150μm超過850μm以下の粒径を有する再造粒体正常粒子に分級する段階を含む、請求項1〜4のいずれかに記載の高吸水性樹脂の製造方法。
- 300〜600μmの粒径を有する前記圧搾微粉再造粒体はEDANA法WSP 241.3によって測定した保水能(CRC)が33.0〜45.0g/gであり、ボルテックス法(Vortex)による吸水速度が50秒以下である、請求項1〜5のいずれかに記載の高吸水性樹脂の製造方法。
- 前記圧搾微粉再造粒体を表面架橋する段階をさらに含む、請求項1〜6のいずれかに記載の高吸水性樹脂の製造方法。
- 前記微粉再造粒体段階では、前記微粉の100重量部に対して3〜20重量部の水を使用する、請求項1〜7のいずれかに記載の高吸水性樹脂の製造方法。
- 前記微粉再造粒体段階では、前記微粉の100重量部に対して5〜20重量部の水を使用する、請求項1〜8のいずれかに記載の高吸水性樹脂の製造方法。
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