JP2000302876A5 - - Google Patents
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- JP2000302876A5 JP2000302876A5 JP2000035941A JP2000035941A JP2000302876A5 JP 2000302876 A5 JP2000302876 A5 JP 2000302876A5 JP 2000035941 A JP2000035941 A JP 2000035941A JP 2000035941 A JP2000035941 A JP 2000035941A JP 2000302876 A5 JP2000302876 A5 JP 2000302876A5
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【特許請求の範囲】
【請求項１】
アクリル酸および／またはその塩を主成分とする単量体を重合・架橋することにより得られる架橋重合体の表面近傍がさらに架橋されてなる吸水性樹脂粉末であって、
ふるい分級での重量平均粒径（Ｄ５０）が１５０〜６００μｍ、吸水性樹脂粉末中の１５０μｍ以下の微粉末が吸水性樹脂粉末全量に対して１０重量％以下であり、
嵩比重（ＪＩＳ Ｋ ３３６２に準じて測定）が０．７４（ｇ／ｍｌ）以上、かつ、
０．９重量％生理食塩水に対する０．７ｐｓｉ（４．８３ｋＰａ）加圧下の６０分間の吸水倍率が２３（ｇ／ｇ）以上である、
ことを特徴とする、不定形破砕状吸水性樹脂粉末。
【請求項２】
前記嵩比重が０．７６（ｇ／ｍｌ）以上である、請求項１に記載の不定形破砕状吸水性樹脂粉末。
【請求項３】
前記表面近傍の架橋が多価アルコールを含む表面架橋剤を用いてなされたものである、請求項１または２に記載の不定形破砕状吸水性樹脂粉末。
【請求項４】
機械的ダメージを受けた後の０．９重量％生理食塩水に対する０．７ｐｓｉ（４．８３ｋＰａ）加圧下の６０分間の吸水倍率が２３（ｇ／ｇ）以上である、請求項１から３までのいずれかに記載の不定形破砕状吸水性樹脂粉末。
【請求項５】
機械的ダメージを受けた後の０．９重量％生理食塩水に対する無加圧下の６０分間の吸水倍率が２５（ｇ／ｇ）以上である、請求項１から４までのいずれかに記載の不定形破砕状吸水性樹脂粉末。
【請求項６】
未架橋の水可溶成分が２０重量％以下である、請求項１から５までのいずれかに記載の不定形破砕状吸水性樹脂粉末。
【請求項７】
分光式色差計で測定したＬ値が８５以上、ａ値が±２の範囲、ｂ値が０〜９の範囲である、請求項１から６までのいずれかに記載の不定形破砕状吸水性樹脂粉末。
【請求項８】
請求項１から７までのいずれかに記載の不定形破砕状吸水性樹脂粉末と繊維基材とを含んでなる、吸収体。
【請求項９】
請求項８の吸収体からなる吸収層を含んでなる、吸収性物品。
【請求項１０】
請求項８の吸収体からなる吸収層を含んでなり、前記吸収体中の不定形破砕状吸水性樹脂粉末の割合が３０重量％以上である、オムツである吸収性物品。
【請求項１１】
単量体水溶液の水溶液重合工程を経て吸水性の架橋重合体粒子を得る工程を含む吸水性樹脂粉末の製造方法において、さらに、前記架橋重合体を粉砕する工程と、必要に応じて前記粉砕工程の前および／または後で乾燥する工程と、前記架橋重合体粒子を嵩比重（ＪＩＳ Ｋ ３３６２に準じて測定）が０．７２（ｇ／ｍｌ）以上に増大するまで研磨する工程と、前記研磨工程の後で前記吸水性樹脂粉末の表面近傍を架橋する工程とを含み、前記吸水性樹脂粉末は、ふるい分級での重量平均粒径（Ｄ５０）が１５０〜６００μｍであり、かつ、吸水性樹脂粉末中の１５０μｍ以下の微粉末が吸水性樹脂粉末全量に対して１０重量％以下であることを特徴とする、不定形破砕状吸水性樹脂粉末の製造方法。
【請求項１２】
前記粉砕工程を、前記研磨工程と同時に行う、請求項１１に記載の不定形破砕状吸水性樹脂粉末の製造方法。
【請求項１３】
前記研磨工程を、架橋重合体粒子の比表面積が減少するような条件で行う、請求項１１または１２に記載の不定形破砕状吸水性樹脂粉末の製造方法。
【請求項１４】
前記研磨工程で発生した微粉末を除去する工程をさらに含む、請求項１１から１３までのいずれかに記載の不定形破砕状吸水性樹脂粉末の製造方法。
【請求項１５】
前記吸水性樹脂粉末の表面近傍を架橋する工程は、多価アルコールを含む表面架橋剤を用いてなされる、請求項１１から１４までのいずれかに記載の不定形破砕状吸水性樹脂粉末の製造方法。
【請求項１６】
前記吸水性樹脂粉末の表面近傍を架橋する工程は、前記吸水性樹脂粉末の０．９重量％生理食塩水に対する０．７ｐｓｉ（４．８３ｋＰａ）加圧下の６０分間の吸水倍率が２３（ｇ／ｇ）以上に増大するまで行われる、請求項１１から１５までのいずれかに記載の不定形破砕状吸水性樹脂粉末の製造方法。
[Claims]
(1)
A water-absorbent resin powder obtained by further crosslinking the vicinity of the surface of a crosslinked polymer obtained by polymerizing and crosslinking a monomer mainly containing acrylic acid and / or a salt thereof,
The weight average particle diameter (D50) in the sieve classification is 150 to 600 μm, and the fine powder of 150 μm or less in the water-absorbent resin powder is 10% by weight or less based on the total amount of the water-absorbent resin powder,
Bulk density (measured according to JIS K 3362) is 0.74 (g / ml) than on, and,
The water absorption capacity for 60 minutes under a pressure of 0.7 psi (4.83 kPa) against 0.9% by weight of physiological saline is 23 (g / g) or more;
An irregularly crushed water-absorbent resin powder , characterized in that:
(2)
The irregularly crushed water-absorbent resin powder according to claim 1, wherein the bulk specific gravity is 0.76 (g / ml) or more.
(3)
3. The irregularly crushed water-absorbent resin powder according to claim 1, wherein the cross-linking near the surface is performed using a surface cross-linking agent containing a polyhydric alcohol. 4.
(4)
The water absorption capacity for 60 minutes under a pressure of 0.7 psi (4.83 kPa) against 0.9% by weight of physiological saline after mechanical damage is 23 (g / g) or more. The irregular shaped crushed water-absorbent resin powder according to any one of the above.
(5)
The non-aqueous solution according to any one of claims 1 to 4, wherein the water absorption capacity of the 0.9% by weight saline solution after mechanical damage without application of pressure for 60 minutes is 25 (g / g) or more. Regular crushed water-absorbent resin powder.
6.
The amorphous crushed water-absorbent resin powder according to any one of claims 1 to 5, wherein the uncrosslinked water-soluble component is 20% by weight or less.
7.
The irregular shaped crushed water absorbent according to any one of claims 1 to 6, wherein the L value measured by a spectroscopic color difference meter is 85 or more, the a value is in a range of ± 2, and the b value is in a range of 0 to 9. Resin powder.
[ 8 ]
An absorber comprising the irregularly crushed water-absorbent resin powder according to any one of claims 1 to 7 and a fiber base material.
Claim 9
An absorbent article comprising an absorbent layer comprising the absorbent body according to claim 8 .
[Claim 10 ]
An absorbent article as a diaper, comprising an absorbent layer comprising the absorbent body according to claim 8 , wherein the proportion of the irregularly crushed water-absorbent resin powder in the absorbent body is 30% by weight or more.
[Claim 11 ]
In a method for producing a water-absorbent resin powder including a step of obtaining water-absorbent crosslinked polymer particles through an aqueous solution polymerization step of a monomer aqueous solution, further, a step of pulverizing the crosslinked polymer, and optionally, the pulverizing step and before and / or drying later in the steps of the crosslinked polymer particles the bulk density (measured according to JIS K 3362) is polished until the increase in 0.72 (g / ml) or more, the polishing look including a step of crosslinking the neighborhood of the surface of the water-absorbent resin powder after the step, the water-absorbent resin powder has a weight average particle size in the sieve classification (D50) is 150～600Myuemu, and water absorption A method for producing an irregularly crushed water-absorbent resin powder, wherein the fine powder having a size of 150 μm or less in the resin powder is 10% by weight or less based on the total amount of the water-absorbent resin powder.
[Claim 12 ]
The method for producing an irregularly crushed water-absorbent resin powder according to claim 11 , wherein the pulverizing step is performed simultaneously with the polishing step .
Claim 13
The method for producing an irregularly crushed water-absorbent resin powder according to claim 11 or 12 , wherein the polishing step is performed under conditions such that the specific surface area of the crosslinked polymer particles decreases.
14.
The method for producing the irregularly crushed water-absorbent resin powder according to any one of claims 11 to 13, further comprising a step of removing fine powder generated in the polishing step.
15.
The production of the irregularly crushed water-absorbent resin powder according to any one of claims 11 to 14, wherein the step of cross-linking the vicinity of the surface of the water-absorbent resin powder is performed using a surface cross-linking agent containing a polyhydric alcohol. Method.
16.
In the step of cross-linking the vicinity of the surface of the water-absorbent resin powder, the water-absorbency of the water-absorbent resin powder against 0.9% by weight of saline for 60 minutes under 0.7 psi (4.83 kPa) pressure is 23 (g / g). The method for producing an irregularly crushed water-absorbent resin powder according to any one of claims 11 to 15, which is performed until the amount increases to g) or more.
すなわち、本発明の不定形破砕状吸水性樹脂粉末は、アクリル酸および／またはその塩を主成分とする単量体を重合・架橋することにより得られる架橋重合体の表面近傍がさらに架橋されてなる吸水性樹脂粉末であって、
ふるい分級での重量平均粒径（Ｄ５０）が１５０〜６００μｍ、吸水性樹脂粉末中の１５０μｍ以下の微粉末が吸水性樹脂粉末全量に対して１０重量％以下であり、
嵩比重（ＪＩＳ Ｋ ３３６２に準じて測定）が０．７４（ｇ／ｍｌ）以上、かつ、
０．９重量％生理食塩水に対する０．７ｐｓｉ（４．８３ｋＰａ）加圧下の６０分間の吸水倍率が２３（ｇ／ｇ）以上である、
ことを特徴とする。
本発明の吸収体は、本発明の不定形破砕状吸水性樹脂粉末と繊維基材とを含んでなることを特徴とする。
本発明の吸収性物品は、本発明の吸収体からなる吸収層を含んでなることを特徴とする。
本発明の別の吸収性物品は、本発明の吸収体からなる吸収層を含んでなり、前記吸収体中の不定形破砕状吸水性樹脂粉末の割合が３０重量％以上である、オムツであることを特徴とする。
That is, the amorphous crushed water-absorbent resin powder of the present invention is obtained by further crosslinking the vicinity of the surface of a crosslinked polymer obtained by polymerizing and crosslinking a monomer containing acrylic acid and / or a salt thereof as a main component. Water-absorbent resin powder,
The weight average particle diameter (D50) in the sieve classification is 150 to 600 μm, and the fine powder of 150 μm or less in the water-absorbent resin powder is 10% by weight or less based on the total amount of the water-absorbent resin powder,
Bulk density (measured according to JIS K 3362) is 0.74 (g / ml) than on, and,
The water absorption capacity for 60 minutes under a pressure of 0.7 psi (4.83 kPa) against 0.9% by weight of physiological saline is 23 (g / g) or more ;
And wherein a call.
The absorbent body of the present invention is characterized by comprising the irregularly crushed water-absorbent resin powder of the present invention and a fiber base material.
The absorbent article of the present invention is characterized by comprising an absorbent layer comprising the absorbent of the present invention.
Another absorbent article of the present invention is a diaper comprising an absorbent layer comprising the absorbent of the present invention, wherein the proportion of the irregularly crushed water-absorbent resin powder in the absorbent is 30% by weight or more. It is characterized by the following.
本発明の不定形破砕状吸水性樹脂粉末の製造方法は、単量体水溶液の水溶液重合工程を経て吸水性の架橋重合体粒子を得る工程を含む吸水性樹脂粉末の製造方法において、さらに、前記架橋重合体を粉砕する工程と、必要に応じて前記粉砕工程の前および／または後で乾燥する工程と、前記架橋重合体粒子を嵩比重（ＪＩＳ Ｋ ３３６２に準じて測定）が０．７２（ｇ／ｍｌ）以上に増大するまで研磨する工程と、前記研磨工程の後で前記吸水性樹脂粉末の表面近傍を架橋する工程とを含み、前記吸水性樹脂粉末は、ふるい分級での重量平均粒径（Ｄ５０）が１５０〜６００μｍであり、かつ、吸水性樹脂粉末中の１５０μｍ以下の微粉末が吸水性樹脂粉末全量に対して１０重量％以下であることを特徴とする。 The method for producing the irregularly crushed water-absorbent resin powder of the present invention is a method for producing a water-absorbent resin powder including a step of obtaining water-absorbent crosslinked polymer particles through an aqueous solution polymerization step of an aqueous monomer solution , further comprising: A step of pulverizing the crosslinked polymer, and, if necessary, a step of drying before and / or after the pulverizing step, and a step wherein the crosslinked polymer particles have a bulk specific gravity (measured according to JIS K 3362) of 0.72 ( seen containing a step of polishing until increases in g / ml) or more, and a step of crosslinking the neighborhood of the surface of the water-absorbent resin powder after the grinding step, the water-absorbent resin powder has a weight average in the sieve classification It is characterized in that the particle size (D50) is 150 to 600 µm and the fine powder having a size of 150 µm or less in the water-absorbent resin powder is 10% by weight or less based on the total amount of the water-absorbent resin powder .
【０００９】
【発明の実施の形態】
以下、本発明について詳細に説明する。
（吸水性樹脂粉末の製造方法）
本発明の吸水性樹脂粉末の製造工程の例を図１に示す。ただし、本発明の吸水性樹脂粉末の製造工程は、これにより限定されるものではない。
本発明の吸水性樹脂粉末の製造方法は、単量体水溶液の水溶液重合工程を経て吸水性の架橋重合体粒子を得る工程を含む吸水性樹脂粉末の製造方法において、さらに、前記架橋重合体を粉砕する工程と、必要に応じて前記粉砕工程の前および／または後で乾燥する工程と、前記架橋重合体粒子を嵩比重（ＪＩＳ Ｋ ３３６２に準じて測定）が０．７２（ｇ／ｍｌ）以上に増大するまで研磨する工程と、前記研磨工程の後で前記吸水性樹脂粉末の表面近傍を架橋する工程とを含み、前記吸水性樹脂粉末は、ふるい分級での重量平均粒径（Ｄ５０）（本明細書中、単に「平均粒径」と称することがある）が１５０〜６００μｍであり、かつ、吸水性樹脂粉末中の１５０μｍ以下の微粉末が吸水性樹脂粉末全量に対して１０重量％以下であることを特徴とする。
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail.
(Method for producing water-absorbent resin powder)
FIG. 1 shows an example of a process for producing the water-absorbent resin powder of the present invention. However, the production process of the water-absorbent resin powder of the present invention is not limited to this.
The method for producing a water-absorbent resin powder of the present invention is a method for producing a water-absorbent resin powder including a step of obtaining water-absorbent crosslinked polymer particles through an aqueous solution polymerization step of an aqueous monomer solution , further comprising: A step of pulverizing and, if necessary, a step of drying before and / or after the pulverizing step ; and a bulk specific gravity (measured according to JIS K 3362) of the crosslinked polymer particles of 0.72 (g / ml). a step of polishing until increases above, look including the step of crosslinking the neighborhood of the surface of the water-absorbent resin powder after the grinding step, the water-absorbent resin powder has a weight average particle size in the sieve classification (D50 ) (Which may be simply referred to as “average particle size” in the present specification) is 150 to 600 μm, and the fine powder of 150 μm or less in the water-absorbent resin powder is 10% by weight based on the total amount of the water-absorbent resin powder. %, especially that less is To.
これら表面架橋剤は、単独で用いてもよく、また、２種類以上を併用してもよい。２種類以上の表面架橋剤を併用する場合には、溶解度パラメータ（ＳＰ値）が互いに異なる第１表面架橋剤および第２表面架橋剤を組み合わせることにより、吸収特性がさらに一層優れた吸水性樹脂を得ることができる。なお、上記の溶解度パラメータとは、化合物の極性を表すファクターとして一般に用いられる値である。
上記の第１表面架橋剤は、架橋重合体（吸水性樹脂粉末）が有するカルボキシル基と反応可能な、溶解度パラメータが１２．５（ｃａｌ／ｃｍ3）1/2（２５．６（Ｊ／ｍ3）1/2）以上の化合物であり、例えばエチレングリコール、プロピレングリコール、グリセリン、エチレンカーボネート、プロピレンカーボネート等が該当する。上記の第２表面架橋剤は、架橋重合体（吸水性樹脂粉末）が有するカルボキシル基と反応可能な、溶解度パラメータが１２．５（ｃａｌ／ｃｍ3）1/2（２５．６（Ｊ／ｍ3）1/2）未満の化合物であり、例えばグリセロールポリグリシジルエーテル、（ポリ）グリセロールポリグリシジルエーテル、エチレングリコールジグリシジルエーテル、１，３−ブタンジオール、トリメチロールプロパン、１，３−プロパンジオール、１，６−ヘキサンジオール、ジエチレングリコール、トリエチレングリコール、テトラエチレングリコール、１，４−ブタンジオール等が該当する。
These surface cross-linking agents may be used alone or in combination of two or more. When two or more surface cross-linking agents are used in combination, the first surface cross-linking agent and the second surface cross-linking agent having different solubility parameters (SP values) are combined to obtain a water-absorbing resin having even more excellent absorption characteristics. Obtainable. The above-mentioned solubility parameter is a value generally used as a factor indicating the polarity of a compound.
The first surface cross-linking agent is capable of reacting with a carboxyl group of a cross-linked polymer (water-absorbent resin powder) and has a solubility parameter of 12.5 (cal / cm 3 ) 1/2 ( 25.6 (J / m). 3 ) 1/2 ) or more compounds, for example, ethylene glycol, propylene glycol, glycerin, ethylene carbonate, propylene carbonate and the like. The second surface cross-linking agent is capable of reacting with a carboxyl group of the cross-linked polymer (water-absorbent resin powder) and has a solubility parameter of 12.5 (cal / cm 3 ) 1/2 ( 25.6 (J / m). 3 ) compounds less than 1/2 ), for example, glycerol polyglycidyl ether, (poly) glycerol polyglycidyl ether, ethylene glycol diglycidyl ether, 1,3-butanediol, trimethylolpropane, 1,3-propanediol, Examples include 1,6-hexanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,4-butanediol, and the like.
加熱処理は通常の乾燥機または加熱炉を用いて行うことができ、溝型混合乾燥機、ロータリー乾燥機、ディスク乾燥機、流動層乾燥機、気流型乾燥機、および赤外線乾燥機が例示される。
上記表面架橋を行うことにより、好ましくは、０．９重量％生理食塩水に対する０．７ｐｓｉ（４．８３ｋＰａ）加圧下の６０分間の吸水倍率が２３（ｇ／ｇ）以上、より好ましくは２５（ｇ／ｇ）以上、さらに好ましくは２７（ｇ／ｇ）以上、特に好ましくは２８（ｇ／ｇ）以上の吸水性樹脂粉末とされる。なお、前記物性は、後述の機械的ダメージ試験を受ける前の物性であるが、本発明の吸水性樹脂粉末は、従来と異なり、機械的ダメージを受けた後も前記物性が維持される、あるいは、ほとんど低下しない、優れた吸水性樹脂粉末である。
The heat treatment can be performed using a usual dryer or a heating furnace, and examples thereof include a groove-type mixing dryer, a rotary dryer, a disk dryer, a fluidized-bed dryer, a gas-flow dryer, and an infrared dryer. .
By performing the surface cross-linking, preferably, the water absorption ratio of 0.7 psi (4.83 kPa) of pressure for 60 minutes for 0.9 wt% saline 2 3 (g / g) or more, more preferably 25 (G / g) or more, more preferably 27 (g / g) or more, particularly preferably 28 (g / g) or more. In addition, the physical properties are physical properties before undergoing a mechanical damage test described later, but the water-absorbent resin powder of the present invention is different from the conventional one, and the physical properties are maintained even after being subjected to mechanical damage, or An excellent water-absorbing resin powder that hardly decreases.
上記の本発明に係る吸水性樹脂粉末の製造方法においては、さらに、必要に応じて、消臭剤、抗菌剤、香料、二酸化珪素や酸化チタン等の無機粉末、発泡剤、顔料、染料、親水性短繊維、可塑剤、粘着剤、界面活性剤、肥料、酸化剤、還元剤、水、塩類、キレート剤、殺菌剤、ポリエチレングリコールやポリエチレンイミンなどの親水性高分子、パラフィンなどの疎水性高分子、ポリエチレンやポリプロピレンなどの熱可塑性樹脂、ポリエステル樹脂やユリア樹脂などの熱硬化性樹脂等を添加する等、吸水性樹脂粉末に種々の機能を付与する工程を含んでいてもよい。
（吸水性樹脂粉末）
本発明に係る不定形破砕状吸水性樹脂粉末は、アクリル酸および／またはその塩を主成分とする単量体を重合・架橋することにより得られる架橋重合体の表面近傍がさらに架橋されてなる吸水性樹脂粉末であって、
ふるい分級での重量平均粒径（Ｄ５０）が１５０〜６００μｍ、吸水性樹脂粉末中の１５０μｍ以下の微粉末が吸水性樹脂粉末全量に対して１０重量％以下であり、
嵩比重（ＪＩＳ Ｋ ３３６２に準じて測定）が０．７４（ｇ／ｍｌ）以上、かつ、
０．９重量％生理食塩水に対する０．７ｐｓｉ（４．８３ｋＰａ）加圧下の６０分間の吸水倍率が２３（ｇ／ｇ）以上である、
ことを特徴とし、例えば、前述の本発明に係る製造方法によって得ることができるものであるが、前記製造方法により限定されるものではない。
In the method for producing a water-absorbent resin powder according to the present invention, if necessary, a deodorant, an antibacterial agent, a fragrance, an inorganic powder such as silicon dioxide or titanium oxide, a foaming agent, a pigment, a dye, and a hydrophilic material. Short fibers, plasticizers, adhesives, surfactants, fertilizers, oxidizing agents, reducing agents, water, salts, chelating agents, fungicides, hydrophilic polymers such as polyethylene glycol and polyethylene imine, and high hydrophobicity such as paraffin. The method may include a step of imparting various functions to the water-absorbing resin powder, such as adding a molecule, a thermoplastic resin such as polyethylene or polypropylene, or a thermosetting resin such as a polyester resin or a urea resin.
(Water absorbent resin powder)
The irregularly crushed water-absorbent resin powder according to the present invention is obtained by further crosslinking the vicinity of the surface of a crosslinked polymer obtained by polymerizing and crosslinking a monomer containing acrylic acid and / or its salt as a main component. A water-absorbent resin powder,
The weight average particle diameter (D50) in the sieve classification is 150 to 600 μm, and the fine powder of 150 μm or less in the water-absorbent resin powder is 10% by weight or less based on the total amount of the water-absorbent resin powder,
Bulk density (measured according to JIS K 3362) is 0.74 (g / ml) than on, and,
The water absorption capacity for 60 minutes under a pressure of 0.7 psi (4.83 kPa) against 0.9% by weight of physiological saline is 23 (g / g) or more ;
Characterized by and this, for example, but those which can be obtained by the manufacturing method according to the invention described above, it is not limited by the production method.
従来の不定形破砕状吸水性樹脂粉末において、０．９重量％生理食塩水に対する０．７ｐｓｉ（４．８３ｋＰａ）加圧下の６０分間の吸水倍率が２０（ｇ／ｇ）以上である場合、嵩比重は０．７４（ｇ／ｍｌ）未満のもののみしか開示されておらず、前記の本発明に係る不定形破砕状吸水性樹脂粉末は新規な樹脂である。嵩比重が０．７４（ｇ／ｍｌ）以上であると、通液できる空間が樹脂全体に均一に分布するため、通液性が向上する。一方、逆相懸濁重合により得られた、粒子径が比較的小さいあるいは球形の吸水性樹脂は、パルプに固定化することが困難で、吸水性物品に不適当なうえ、最密充填となりやすく、通液できる粒子間の空間部分が少なくなりすぎて、（加圧下の）通液性が低下する。したがって、前記の本発明に係る吸水性樹脂粉末は、吸水性と（加圧下の）通液性の両方の性能向上が両立できた樹脂である。従来は、高加圧下のゲルの通液性を確保するためには、ゲルの架橋密度を増やしたり、添加剤を加えることによって、吸収特性を犠牲にする必要があり、一方、高い吸収特性（吸水倍率）を確保するためには、通液性が犠牲になっていたため、吸水性と（加圧下の）通液性の両立は困難であったが、本発明の吸水性樹脂粉末はそれを可能にしたものである。 In the case of conventional amorphous crushed water-absorbent resin powder, when the water absorption capacity under a pressure of 0.7 psi (4.83 kPa) against 0.9% by weight of physiological saline for 60 minutes is 20 (g / g) or more, the bulk Only those having a specific gravity of less than 0.74 (g / ml) are disclosed, and the irregularly crushed water-absorbent resin powder according to the present invention is a novel resin. When the bulk specific gravity is 0.74 (g / ml) or more, the space through which the liquid can pass is uniformly distributed throughout the resin, so that the liquid permeability improves. On the other hand, a water-absorbent resin having a relatively small particle diameter or a spherical shape obtained by reverse-phase suspension polymerization is difficult to immobilize on pulp, is unsuitable for water-absorbent articles, and tends to be closest packed. In addition, the space between the particles that can pass through is too small, and the liquid permeability (under pressure) decreases. Therefore, the water-absorbent resin powder according to the present invention is a resin having both improved water absorbency and improved liquid permeability (under pressure). Conventionally, in order to ensure the liquid permeability of a gel under high pressure, it is necessary to increase the crosslink density of the gel or to sacrifice the absorption property by adding an additive. In order to ensure water absorption capacity), it was difficult to achieve both water absorption and liquid permeability (under pressure) because liquid permeability was sacrificed, but the water-absorbent resin powder of the present invention required It is made possible.
また、本発明に係る不定形破砕状吸水性樹脂粉末における、０．９重量％生理食塩水に対する０．７ｐｓｉ（４．８３ｋＰａ）加圧下の６０分間の吸水倍率は、２３（ｇ／ｇ）以上、好ましくは２５（ｇ／ｇ）以上、より好ましくは２７（ｇ／ｇ）以上、特に好ましくは２８（ｇ／ｇ）以上である。なお、前記物性は、後述の機械的ダメージ試験を受ける前の物性であるが、本発明の吸水性樹脂粉末は、従来と異なり、機械的ダメージを受けた後も、前記物性が維持される、あるいは、ほとんど低下しない、優れた吸水性樹脂粉末である。
本発明に係る不定形破砕状吸水性樹脂粉末は、先の製造方法の説明において述べたものと同様の理由により、前記樹脂粉末の表面近傍が架橋されたものであることが好ましく、さらにその架橋が多価アルコールを含む表面架橋剤を用いてなされたものであることが好ましい。表面架橋剤の種類や表面架橋の方法等は、前述と同様である。
Further, in irregularly pulverized water-absorbent resin powder according to the present invention, the water absorption capacity of 0.7 psi (4.83 kPa) of pressure for 60 minutes for 0.9 wt% saline, 2 3 (g / g) above, good Mashiku is 25 (g / g) or more, more preferably 27 (g / g) or more, particularly preferably 28 (g / g) or more. In addition, the physical properties are physical properties before undergoing a mechanical damage test described below, but the water-absorbent resin powder of the present invention is different from the conventional one, and even after mechanical damage, the physical properties are maintained. Alternatively, it is an excellent water-absorbing resin powder that hardly decreases.
The irregularly crushed water-absorbent resin powder according to the present invention is preferably the one in which the surface vicinity of the resin powder is cross-linked, for the same reason as described in the description of the above-mentioned production method, and furthermore, the cross-linking is performed. Is preferably performed using a surface crosslinking agent containing a polyhydric alcohol. The type of the surface cross-linking agent and the method of surface cross-linking are the same as described above.
本発明で得られた吸水性樹脂粉末の平均粒径は、１５０〜６００μｍであり、好ましくは３００〜６００μｍである。また、吸水性樹脂粉末中の１５０μｍ以下の微粉末は、吸水性樹脂粉末全量に対して１０重量％以下であり、好ましくは５重量％以下である。
本発明に係る不定形破砕状吸水性樹脂粉末は、分光式色差計等を用いて測定した明度（明度指数）Ｌ値が、好ましくは８５以上であり、色度（クロマチックネス指数）を示すａ値、ｂ値が、好ましくは、ａ値が±２の範囲、ｂ値が０〜９の範囲である。これらＬ値、ａ値、ｂ値の値が上記範囲を外れると、吸水性樹脂粉末の表面に褐色の着色が見られる傾向があり、特に、吸収体中の吸水性樹脂濃度（重量％）が高い場合には吸収体中で吸水性樹脂の粒子が黄ばんだ斑点状に見えることがあるため、消費者に好まれない。かかる明度や色度は、原料（モノマー、開始剤など）およびその純度や、製造条件（加熱温度や時間）などで決定されるが、通常前記した本発明の条件を適宜行えばよい。
The average particle diameter of the water-absorbent resin powder obtained in the present invention is 1 50 to 600, good Mashiku is 300～600Myuemu. Further, 150 [mu] m or less fine powder of the water-absorbent resin powder is to water-absorbent resin powder total amount is 1 0% by weight or less, preferably 5 wt% or less.
The amorphous crushed water-absorbent resin powder according to the present invention preferably has a lightness (brightness index) L value of at least 85 measured using a spectroscopic colorimeter or the like, and exhibits a chromaticity (chromaticity index). The value and the b value are preferably in the range of ± 2 for the a value and in the range of 0 to 9 for the b value. When the L value, a value, and b value are out of the above ranges, the surface of the water-absorbent resin powder tends to be colored in brown, and particularly, the water-absorbent resin concentration (% by weight) in the absorber is low. If it is too high, the particles of the water-absorbent resin may look like yellow spots in the absorber, which is not preferred by consumers. Such lightness and chromaticity are determined by raw materials (monomers, initiators, etc.) and their purity, production conditions (heating temperature and time), and the like, and the above-mentioned conditions of the present invention may be appropriately performed.
本発明に係る不定形破砕状吸水性樹脂粉末、あるいは、本発明の製造方法により得られた吸水性樹脂粉末は、プロセスダメージ（機械的ダメージ）による物性の低下が少なく、機械的ダメージ試験（後述実施例において説明）後の０．９重量％生理食塩水に対する無加圧下の６０分間の吸水倍率が、好ましくは２５（ｇ／ｇ）以上、より好ましくは３０（ｇ／ｇ）以上、さらに好ましくは３５（ｇ／ｇ）以上である。また、水可溶成分は前述した範囲と同様であり、好ましくは２０重量％以下、より好ましくは１５重量％以下、さらに好ましくは１２重量％以下、さらにより好ましくは１０重量％以下である。
（吸収体）
本発明に係る吸収体は、前記の本発明に係る不定形破砕状吸水性樹脂粉末と、親水性繊維等の繊維基材とを含んでなることを特徴としている。そして、吸収体が例えば吸水性樹脂粉末と親水性繊維とからなる場合には、吸収体の構成としては、例えば、吸水性樹脂粉末と親水性繊維とを均一に混合したものを含む構成が本発明の効果を十分発揮させる上で好ましい。この場合、吸水性樹脂粉末と親水性繊維との重量比率は、通常、２０：８０〜９０：１０の範囲であり、好ましくは、３０：７０〜９０：１０の範囲、より好ましくは、４０：６０〜８０：２０の範囲であり、さらに好ましくは、５０：５０〜８０：２０の範囲である。本発明の吸水性樹脂粉末は、その表面が研磨され、通液性に優れたものであるため、その特徴を最大限に発揮するには、吸水性樹脂粉末の比率が３０重量％以上であることが好ましく、４０重量％以上であることがより好ましい。このようなものとしては例えば吸水性樹脂粉末と親水性繊維とを均一に混合した構成；吸水性樹脂粉末と親水性繊維とを均一に混合して層状に形成し、この上に層状に形成した親水性繊維を積層した構成；吸水性樹脂粉末と親水性繊維とを均一に混合して層状に形成し、これと層状に形成した親水性繊維との間に吸水性樹脂粉末を挟持した構成等を例示することができる。またこの他にも層状に形成した親水性繊維間に吸水性樹脂粉末を挟持した構成等でもよい。さらに、吸収体は、吸水性樹脂粉末に対して特定量の水を配合することによって該吸水性樹脂粉末をシート状に形成してなる構成であってもよい。尚、吸収体の構成は、上記例示の構成に限定されるものではない。
The irregularly crushed water-absorbent resin powder according to the present invention or the water-absorbent resin powder obtained by the production method of the present invention has a small decrease in physical properties due to process damage (mechanical damage), and has a mechanical damage test (described later). The water absorption capacity of 0.9% by weight of physiological saline after no pressure application for 60 minutes is preferably 25 (g / g) or more, more preferably 30 (g / g) or more, and even more preferably. Is 35 (g / g) or more. The water-soluble component is the same as that described above, and is preferably 20% by weight or less, more preferably 15% by weight or less, further preferably 12% by weight or less, and still more preferably 10% by weight or less.
(Absorber)
The absorber according to the present invention is characterized by comprising the irregularly crushed water-absorbent resin powder according to the present invention and a fiber base material such as a hydrophilic fiber. When the absorber is made of, for example, a water-absorbent resin powder and hydrophilic fibers, the structure of the absorber may be, for example, a structure including a uniform mixture of the water-absorbent resin powder and the hydrophilic fibers. It is preferable in that the effects of the present invention can be sufficiently exhibited. In this case, the weight ratio of the water-absorbent resin powder to the hydrophilic fiber is usually in the range of 20:80 to 90:10, preferably in the range of 30:70 to 90:10, and more preferably 40:90 to 90:10. It is the range of 60-80: 20, More preferably, it is the range of 50: 50-80: 20. Since the surface of the water-absorbent resin powder of the present invention is polished and excellent in liquid permeability, the ratio of the water-absorbent resin powder is 30% by weight or more in order to maximize its characteristics. And more preferably 40% by weight or more. Examples of such a material include a structure in which a water-absorbent resin powder and a hydrophilic fiber are uniformly mixed; a method in which a water-absorbent resin powder and a hydrophilic fiber are uniformly mixed to form a layer, and a layer is formed thereon. A structure in which hydrophilic fibers are laminated; a structure in which a water-absorbent resin powder and a hydrophilic fiber are uniformly mixed to form a layer, and the water-absorbent resin powder is sandwiched between the layer and the hydrophilic fibers formed in a layer. Can be exemplified. In addition, a configuration in which a water-absorbing resin powder is sandwiched between hydrophilic fibers formed in layers may be used. Further, the absorber may have a configuration in which a specific amount of water is mixed with the water-absorbent resin powder to form the water-absorbent resin powder into a sheet. The configuration of the absorber is not limited to the above-described configuration.
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| EP3896116A4 (en) * | 2018-12-12 | 2022-10-05 | Sumitomo Seika Chemicals Co., Ltd. | Water-absorbent resin particles |
| KR102452567B1 (en) * | 2019-01-07 | 2022-10-06 | 주식회사 엘지화학 | Super absorbent polymer and preparation method thereof |
| JP7165753B2 (en) * | 2019-01-11 | 2022-11-04 | Ｓｄｐグローバル株式会社 | Water-absorbing resin particles and method for producing the same |
| JP7091556B2 (en) * | 2019-04-23 | 2022-06-27 | 住友精化株式会社 | Water-absorbent resin particles and water-absorbent sheet |
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2000
- 2000-02-14 JP JP2000035941A patent/JP4380873B2/en not_active Expired - Fee Related
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