JPH10316874A - Production of water-absorbing resin aggregate and sheetlike water-absorbing material - Google Patents
Production of water-absorbing resin aggregate and sheetlike water-absorbing materialInfo
- Publication number
- JPH10316874A JPH10316874A JP14467497A JP14467497A JPH10316874A JP H10316874 A JPH10316874 A JP H10316874A JP 14467497 A JP14467497 A JP 14467497A JP 14467497 A JP14467497 A JP 14467497A JP H10316874 A JPH10316874 A JP H10316874A
- Authority
- JP
- Japan
- Prior art keywords
- water
- absorbent resin
- weight
- aggregate
- parts
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は吸水性樹脂凝集体及
びシート状吸水体の製造方法に関する。さらに詳しく
は、ブロック状あるいはシート状などに成形して用いる
ことが出来る吸水性樹脂凝集体の製造方法及び繊維との
併用によるシート状吸水体の製造方法に関するものであ
り、吸水性樹脂の製造及び応用技術に属するものであ
る。The present invention relates to a method for producing a water-absorbent resin aggregate and a sheet-shaped water-absorbent body. More specifically, the present invention relates to a method for producing a water-absorbent resin aggregate that can be used by molding into a block shape or a sheet shape, and a method for producing a sheet-like water absorbent body in combination with a fiber. It belongs to applied technology.
【０００２】[0002]
【従来の技術】従来より、吸水性樹脂は、生理用品、紙
おむつ、使い捨て雑巾などの衛生用品や保水剤、土壌改
質剤などの農園芸用品として、また汚泥の固化、建材の
露結防止、油脂中の脱水などの様々な分野で利用されて
きている。この様に広い用途を有する吸水性樹脂の主成
分としては、アクリル酸塩重合体架橋物、澱粉−アクリ
ル酸グラフト共重合体、澱粉−アクリロニトリルグラフ
ト共重合体の加水分解物、ポリオキシエチレン架橋物、
カルボキシメチルセルロース架橋物などが挙げられ、ま
た現実に幅広く用いられている。これらを成分とする吸
水性樹脂は、一般に、逆相懸濁重合、逆相乳化重合、水
溶液重合などの方法によって合成された重合体を、その
まま乾燥して製品とされたものか、重合体を乾燥したの
ち粉砕して得られる粒子に、粒子表面の架橋密度を高め
るために後処理（後架橋）が施され、或いはさらに粉体
の吸湿によるブロッキング性を抑制するためのブロッキ
ング防止剤が添加されて製品とされているものである。
その様にして製造される吸水性樹脂は、現在主に粉末体
で供給されており、例えば紙おむつなどに使用する場合
にはシート状の基材の上に散布、あるいはパルプと均一
に混合して使用されている。しかしながら、紙おむつの
吸水能力を大きくするために、紙おむつ中の吸水性樹脂
量を大幅に増加すると、吸水性樹脂粉末のパルプやティ
ッシュに対する接着性が悪くなって、おむつ内で樹脂が
偏り使用時の不快感を増大させてしまうという問題を引
き起こしてしまう。この点を改良するために、すなわち
接着性を向上させるために、各種接着剤を併用する、パ
ルプのエンボス加工を高温度で行うなどとという処置を
講ずると吸水性樹脂の吸水能力や吸水速度等の性能を低
下してしまうという問題が発生する。さらに、多くの吸
水性樹脂は、紙おむつ製造時や土木用として土壌に添加
する際、あるいは様々な用途で紙袋などから容器に移し
替えるときなどに微粉末が飛散するため、作業環境上の
問題を発生させている。2. Description of the Related Art Conventionally, water-absorbent resins have been used as sanitary products such as sanitary products, disposable diapers, disposable rags, agricultural and horticultural products such as water retention agents, soil modifiers, solidification of sludge, prevention of dew condensation on building materials, It has been used in various fields such as dehydration in fats and oils. The main components of the water-absorbing resin having such a wide range of uses include crosslinked acrylate polymers, starch-acrylic acid graft copolymers, hydrolyzed starch-acrylonitrile graft copolymers, and polyoxyethylene crosslinked products. ,
A carboxymethylcellulose cross-linked product and the like are mentioned, and are actually widely used. The water-absorbing resin containing these components is generally a polymer synthesized by a method such as reverse-phase suspension polymerization, reverse-phase emulsion polymerization, or aqueous solution polymerization. The particles obtained by drying and then pulverizing are subjected to post-treatment (post-crosslinking) to increase the crosslinking density on the particle surface, or an anti-blocking agent is added to suppress the blocking property of the powder due to moisture absorption. Products.
The water-absorbent resin thus produced is currently supplied mainly in the form of a powder.For example, when used in a disposable diaper, the resin is sprayed on a sheet-like substrate, or evenly mixed with pulp. It is used. However, if the amount of water-absorbent resin in the disposable diaper is greatly increased in order to increase the water-absorbing capacity of the disposable diaper, the adhesiveness of the absorbent resin powder to pulp or tissue is deteriorated, and the resin is unbalanced in the diaper when used. This causes a problem of increasing discomfort. In order to improve this point, that is, in order to improve adhesiveness, various adhesives are used in combination, and pulp is embossed at a high temperature. However, there is a problem that the performance of the device is deteriorated. Furthermore, many water-absorbent resins cause problems in the working environment because fine powder is scattered when disposable diapers are manufactured, added to the soil for civil engineering, or transferred from paper bags to containers for various purposes. Is occurring.
【０００３】そこで、上記の問題点を解決する一つの手
段として、吸水性樹脂粉末の粒度を調整するということ
が提案され、従来の吸水性樹脂粉末に対する様々な造粒
・凝集方法が提供されてきているが、いずれも完全に満
足し得る手段とは言えないものである。例えば、特開昭
62−132936号公報や特開平2−308820号公報に示される
様に、バインダーを用いて微粉末を造粒・凝集する方法
が提案されており、バインダーとして、粉末状無機物質
の二酸化珪素、水溶性高分子のポリビニルアルコール、
ポリアクリル酸ソーダ、澱粉、セルロース等が開示され
ている。しかしながら、水溶液をバインダーとして用い
る方法は、粘結造粒されるべき吸水性樹脂粉末が急速に
水溶液を吸収して、高密度の大きな塊を形成し易く、均
一な造粒・凝集物を得ることが困難な方法である。上記
問題を解決する他の方法として、特開昭61−97333号公
報や特開昭61−101536号公報では、高速回転パドル型混
合機や気流型混合機等の特定の混合機を用いて高吸水性
樹脂粉末と水性液とを混合して造粒・凝集する方法、特
公平7−62073号公報では、気流によって分散された樹脂
粉末と水性液とを並流状態で接触させて造粒・凝集する
方法が提案されている。しかしながら、上述の何れの方
法も粉末粒子間の接着力が弱いために造粒・凝集効果が
少なく、造粒物の回収率が極めて低いため効率的な処理
という点に問題を残すものである。また、特開平7−290
446号公報には高分子化合物の造粒・凝集方法として、
乾式造粒機を用いて高分子粒子を板状に圧縮成型した
後、解砕機により解砕する方法が提案され、乾式造粒機
及び解砕機の装置に関しての開示がある。これらの装置
は、ポリエステルのメチレンクロライド発泡質微粒子
や、有機染料のメチルエチルケトン溶液等からの乾燥粉
末、その他、接着性の高い原料粉体に対して有効な乾式
造粒装置ではあるが、ブロッキング防止剤が添加されて
粉体の接着性が低下させられている吸水性樹脂粉末で
は、その接着性の低さのために、前記乾式造粒機を用い
て圧縮しても板状の成型物が得られず、微粉末の状態の
ままで排出されてしまい、この乾式造粒法での吸水性樹
脂粉末の造粒・凝集は通常の条件では不可能である。さ
らにこうした問題を解決するために、特許第２５５２１
７１号公報で吸水性樹脂にパルプや粘土などを併用して
造粒成形し、製品化する方法が提案されているが、押出
造粒機などを用いて吸水性樹脂を造粒成形する場合、吸
水性樹脂は容易に水を吸収して膨潤し、比重が軽くなっ
てしまうことと、近年のゲル表面に濡れ感を与えないよ
うに設計された吸水性樹脂は、粘性がなくパサパサして
他の物質と接着し難いということのために造粒、特に１
００μm以上の粒径を持つ吸水性樹脂粉末あるいは顆粒
物にすることは容易なことではなく、さらに、強力な圧
力と熱を加えて作成した吸水性樹脂造粒物は、吸水に関
与する表面積が著しく低下することが多く、吸水性樹脂
本来の吸水速度を損なうという問題を生じさせている。To solve the above problems, it has been proposed to adjust the particle size of the water-absorbent resin powder, and various methods of granulating and aggregating the conventional water-absorbent resin powder have been provided. However, none of these are completely satisfactory means. For example,
As shown in JP-A-62-132936 and JP-A-2-308820, a method of granulating and aggregating a fine powder using a binder has been proposed. Polyvinyl alcohol, a conductive polymer,
Sodium polyacrylate, starch, cellulose and the like are disclosed. However, the method of using an aqueous solution as a binder is such that the water-absorbent resin powder to be caking-granulated quickly absorbs the aqueous solution, easily forms a high-density large lump, and obtains uniform granules and aggregates. Is a difficult method. As another method for solving the above problem, JP-A-61-97333 and JP-A-61-101536 disclose a method of using a high-speed rotary paddle type mixer or an airflow type mixer. Japanese Patent Publication No. 7-62073 discloses a method of mixing and granulating and coagulating a water-absorbent resin powder and an aqueous liquid. Agglomeration methods have been proposed. However, any of the above-mentioned methods has a problem in that the adhesion between the powder particles is weak, so that the granulation / aggregation effect is small, and the recovery rate of the granulated material is extremely low, so that efficient treatment is required. Also, JP-A-7-290
No. 446 discloses a method for granulating and aggregating polymer compounds,
A method in which polymer particles are compression-molded into a plate shape using a dry granulator and then crushed by a crusher has been proposed, and there are disclosures regarding the apparatus of the dry granulator and the crusher. These devices are effective dry granulation devices for polyester methylene chloride foamed fine particles, dry powders of organic dyes in methyl ethyl ketone, etc., and other highly-adhesive raw material powders. Is added to reduce the adhesiveness of the powder, due to the low adhesiveness, a plate-like molded product is obtained even when compressed using the dry granulator. However, the water-absorbent resin powder is discharged as it is in the state of fine powder, and granulation and agglomeration of the water-absorbent resin powder by this dry granulation method cannot be performed under ordinary conditions. To further solve such a problem, Japanese Patent No. 25521 is disclosed.
No. 71 discloses a method of granulating and molding a water absorbent resin in combination with pulp or clay, and a method of commercializing the product.However, when granulating a water absorbent resin using an extrusion granulator or the like, The water-absorbent resin easily absorbs water and swells, reducing its specific gravity.In recent years, the water-absorbent resin designed not to give a wet feeling to the gel surface Granulation due to the fact that it is difficult to adhere to
It is not easy to make a water-absorbent resin powder or granules having a particle size of 00 μm or more.Furthermore, water-absorbent resin granules created by applying strong pressure and heat have a remarkable surface area involved in water absorption. This often causes the problem that the original water absorption speed of the water-absorbent resin is impaired.
【０００４】[0004]
【発明が解決しようとする課題】本発明者等は、上記従
来の吸水性樹脂の造粒・凝集方法について検討し、従来
の方法が有している問題点を解消した新しい吸水性樹脂
の造粒・凝集方法を提供することを目的として研究を行
ったのである。DISCLOSURE OF THE INVENTION The present inventors have studied the above-mentioned conventional methods of granulating and aggregating a water-absorbent resin, and have found that a new water-absorbent resin which has solved the problems of the conventional method can be obtained. Research was conducted with the aim of providing a grain / agglomeration method.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、適度に吸
水した吸水性樹脂が親水性有機溶剤に接触すると容易に
凝集し、得られた吸水性樹脂凝集体は吸水速度、吸水
量、成形性に優れたものであることを見出して本発明を
完成したのである。すなわち本発明は、吸水した吸水性
樹脂粒子に親水性有機溶剤を添加することにより前記粒
子を凝集させることを特徴とする吸水性樹脂凝集体の製
造方法に関するものであり、特に重量比で１／１００か
ら２倍の水を吸水した１００重量部の吸水性樹脂粒子に
親水性有機溶剤５０重量部以上を添加することにより前
記粒子を凝集させることを特徴とする吸水性樹脂凝集体
の製造方法、更には吸水性樹脂粒子を繊維と共存させて
シート状となし、該粒子を上記吸水性樹脂凝集体の製造
方法で凝集体とすることを特徴とするシート状吸水体の
製造方法に関するものである。Means for Solving the Problems The present inventors have found that a water-absorbent resin that has absorbed water appropriately will easily aggregate when it comes into contact with a hydrophilic organic solvent, and the resulting water-absorbent resin aggregate will have a water absorption rate, water absorption, The present inventors have found that they have excellent moldability and completed the present invention. That is, the present invention relates to a method for producing a water-absorbent resin aggregate, which comprises aggregating the water-absorbent resin particles by adding a hydrophilic organic solvent to the water-absorbent resin particles. A method for producing a water-absorbent resin aggregate, comprising adding 100 parts by weight or more of a water-absorbent resin particle that has absorbed 100 to 2 times the amount of water and adding 50 parts by weight or more of a hydrophilic organic solvent to the water-absorbent resin particles. Further, the present invention relates to a method for producing a sheet-shaped water-absorbent body, wherein the water-absorbent resin particles are coexisted with fibers to form a sheet, and the particles are formed into an aggregate by the method for producing a water-absorbent resin aggregate. .
【０００６】[0006]
【発明の実施の形態】本発明に用いられる吸水性樹脂粒
子としては、上述した従来公知のもののいずれもが挙げ
られるが、水に対して数十倍以上の吸水能力を有する樹
脂で、例えばポリアクリル酸部分軽金属微架橋物、デン
プン−アクリロニトリル・グラフト共重合体微架橋物、
アクリル酸−ビニルアルコール共重合体微架橋物、無水
マレイン酸−ポリビニルアルコール共重合体微架橋物、
酢酸ビニル−アクリル酸メチル共重合体ケン化物、架橋
ポリエチレンオキサイド変性物等からなるものが好まし
いものとして挙げられる。用いられる吸水性樹脂粒子の
粒子径に関しても特に限定されるものはなく、例えば大
凡直径５mm以下の粒子状、フレーク状のものは問題なく
本発明に供することができ、もちろん微粉末の粒子にも
適用される。DESCRIPTION OF THE PREFERRED EMBODIMENTS As the water-absorbing resin particles used in the present invention, any of the above-mentioned conventionally known water-absorbing resin particles can be used. Acrylic acid partially light metal micro-crosslinked product, starch-acrylonitrile-graft copolymer micro-crosslinked product,
Acrylic acid-vinyl alcohol copolymer finely crosslinked product, maleic anhydride-polyvinyl alcohol copolymer finely crosslinked product,
Preferred are those composed of saponified vinyl acetate-methyl acrylate copolymer, modified cross-linked polyethylene oxide, and the like. There is no particular limitation on the particle size of the water-absorbing resin particles used, for example, particles having a diameter of about 5 mm or less, flakes can be used in the present invention without any problem, and of course, fine powder particles can also be used. Applied.
【０００７】本発明において用いられる吸水性樹脂粒子
は吸水しているものであることが必要であり、吸水は吸
水性樹脂粒子に水を添加することによりなされるもので
あり、水の添加量としては吸水性樹脂粒子１００重量部
に対し水１〜２００重量部であるのが好ましく、より好
ましくは１０〜１００重量部である。添加する水の量が
吸水性樹脂粒子１００重量部に対し１重量部を下回る
と、樹脂粒子同士の凝集力がその後の成形に耐えること
が出来ない恐れがあり、２００重量部を超える様になる
と、吸水性樹脂の飽和吸水量を越え、吸水性樹脂は膨潤
状態となり粒子同士の吸着力がなく凝集しない恐れがあ
る。水の添加方法については、実質的に吸水性樹脂粒子
と水とを接触させることが可能な方法であれば特に限定
はなく、水の入った容器中に吸水性樹脂粒子を投入する
方法、混合機内で流動状態にある吸水性樹脂粒子に噴
霧、滴下等を行っても良い。It is necessary that the water-absorbing resin particles used in the present invention absorb water, and the water absorption is achieved by adding water to the water-absorbing resin particles. Is preferably 1 to 200 parts by weight of water, more preferably 10 to 100 parts by weight, based on 100 parts by weight of the water-absorbent resin particles. If the amount of water to be added is less than 1 part by weight based on 100 parts by weight of the water-absorbing resin particles, the cohesive force between the resin particles may not be able to withstand subsequent molding, and if it exceeds 200 parts by weight. If the water absorption exceeds the saturated water absorption of the water-absorbent resin, the water-absorbent resin may be in a swelling state, and may not agglomerate due to no adsorbing power between particles. The method of adding water is not particularly limited as long as it is a method capable of substantially bringing the water-absorbent resin particles into contact with water, and a method of adding the water-absorbent resin particles into a container containing water, mixing Spraying, dripping, etc. may be performed on the water-absorbing resin particles in a fluid state in the machine.
【０００８】以上の様にして吸水した吸水性樹脂粒子
に、親水性有機溶剤を加えることによって、本発明の目
的とする吸水性樹脂凝集体が得られるのである。この場
合に用いられる親水性有機溶剤の具体例としては、アセ
トン、アセチルアセトン、メタノール、エタノール、n-
プロパノール、イソプロパノール、酢酸メチル、酢酸エ
チル、酢酸プロピル、アセトニトリルなどが挙げられ
る。これらの親水性有機溶剤は単独で使用することも、
２種類以上を混合して使用することもできる。親水性有
機溶剤のなかでも、吸水性樹脂粒子に対して自己吸着能
力を発現させる能力の大きいものは、親水性有機溶剤の
添加温度における比誘電率が３５以下のものであり、そ
の様な比誘電率を有する親水性有機溶剤が本発明に好ま
しく、より好ましくは比誘電率が３０以下の親水性有機
溶剤が用いられる。比誘電率が低い親水性有機溶剤は水
分子が吸水性樹脂粒子間の吸着を促すのを電気的に補助
する働きを示すと考えられ、本発明においては比誘電率
がなるべく低い親水性有機溶剤を使用することが好まし
く、比誘電率が１９〜２１のアセトン、n-プロパノー
ル、イソプロパノール等は比誘電率が２５のエタノール
よりも本発明にとり好ましい。比誘電率は一般的に温度
上昇とともに低下するので、使用する溶剤の温度を上げ
ることによって当該溶剤の非誘電率を低下させて使用す
る方法も、吸着力を強める方向に働き本発明にとり好ま
しい方法である。すなわち、比誘電率が常温で３５を超
えている親水性有機溶剤も、暖めることによって誘電率
が３５以下になった場合は本発明にとり好ましいものと
なる。また、アセトニトリルなど、加水分解によって誘
電率が下がる可能性のある有機溶剤も、その物自体の非
誘電率が３５を超えても使用できる場合がある。親水性
有機溶剤の添加量は、吸水性樹脂粒子表面の親水性基と
吸着に関与する吸水性樹脂粒子の吸水量の割合に応じて
調整されなければならないが、一般的には吸水性樹脂粒
子１００重量部に対して親水性有機溶剤を５０重量部以
上、好ましくは親水性有機溶剤を１００〜５００重量部
添加使用される。吸水性樹脂１００重量部に対して加え
る親水性有機溶剤の量が５０重量部未満であると、吸着
は可能であるものの、乾燥後に造粒物が容易に解砕され
てしまう恐れがあり、親水性有機溶剤の量が多すぎる
と、凝集物製造後の親水性有機溶剤の処理などの面で、
経済的に好ましくない。親水性有機溶剤の添加方法につ
いて格別の手段はなく、混合機等により吸水性樹脂粒子
攪拌下に親水性有機溶剤を添加する方法が一般的に用い
られる。By adding a hydrophilic organic solvent to the water-absorbing resin particles having absorbed water as described above, a water-absorbing resin aggregate intended for the present invention can be obtained. Specific examples of the hydrophilic organic solvent used in this case include acetone, acetylacetone, methanol, ethanol, n-
Examples include propanol, isopropanol, methyl acetate, ethyl acetate, propyl acetate, acetonitrile and the like. These hydrophilic organic solvents can be used alone,
Two or more types can be used in combination. Among the hydrophilic organic solvents, those having a high ability to exhibit self-adsorption ability to the water-absorbing resin particles have a relative dielectric constant of 35 or less at the temperature at which the hydrophilic organic solvent is added, A hydrophilic organic solvent having a dielectric constant is preferable for the present invention, and a hydrophilic organic solvent having a relative dielectric constant of 30 or less is more preferably used. A hydrophilic organic solvent having a low relative dielectric constant is considered to exhibit a function of electrically assisting water molecules to promote adsorption between water-absorbing resin particles. In the present invention, a hydrophilic organic solvent having a relative dielectric constant as low as possible is considered. It is preferable to use acetone, n-propanol, isopropanol and the like having a relative dielectric constant of 19 to 21 in the present invention over ethanol having a relative dielectric constant of 25. Since the relative dielectric constant generally decreases as the temperature rises, the method of using the solvent by lowering the non-dielectric constant of the solvent by increasing the temperature of the solvent used also works in the direction of increasing the adsorptive power, and is a preferred method for the present invention. It is. That is, a hydrophilic organic solvent having a relative dielectric constant exceeding 35 at room temperature is also preferable for the present invention when the dielectric constant becomes 35 or less by warming. Further, an organic solvent such as acetonitrile, whose dielectric constant may be lowered by hydrolysis, may be used even if the non-dielectric constant of the substance itself exceeds 35. The amount of the hydrophilic organic solvent to be added must be adjusted according to the ratio of the amount of water absorption of the water-absorbing resin particles involved in the adsorption and the hydrophilic groups on the surface of the water-absorbing resin particles. The hydrophilic organic solvent is used in an amount of 50 parts by weight or more, preferably 100 to 500 parts by weight, based on 100 parts by weight. If the amount of the hydrophilic organic solvent added to 100 parts by weight of the water-absorbent resin is less than 50 parts by weight, although the adsorption is possible, the granulated material may be easily crushed after drying, and If the amount of the hydrophilic organic solvent is too large, in terms of treatment of the hydrophilic organic solvent after the production of aggregates,
Not economically favorable. There is no particular method for adding the hydrophilic organic solvent, and a method of adding the hydrophilic organic solvent while stirring the water-absorbing resin particles using a mixer or the like is generally used.
【０００９】本発明により得られる吸水性樹脂凝集体
は、必要によって増量剤などの他の物質を添加して造粒
・成形することができる。例えば、紙おむつやペットシ
ーツなどに使用される場合は不織布やパルプなど、土壌
改良材や土木工事用薬剤として使用される場合はベント
ナイトなどの粘土や肥料など、吸水性樹脂粒子の吸着を
阻害しないものであれば形状、組成、大きさなどに関わ
らず共に使用することができる。必要によって増量剤等
を混合した吸水性樹脂凝集体を得る際の、吸水性樹脂と
増量剤を混合する際における混合順序については格別な
手段は存在しないが、増量剤と吸水性樹脂が均一に配合
された造粒・凝集体を望む場合は、増量剤と吸水性樹脂
を予め混合する必要がある。一般に、水と有機溶剤とに
より凝集した吸水性樹脂凝集体は、乾燥した後に使用さ
れるが、乾燥以前の可撓性のある段階でも成形すること
ができる。乾燥には、樹脂に取り込まれた有機溶剤を除
去するため、当初室温付近で減圧乾燥することが好まし
い。本発明により得られた吸水性樹脂凝集体を用いる
と、紙おむつ、生理用品、尿取りパッド、ペットシート
などの吸水シートや、猫砂、農業用土壌改良材などの粘
土やパルプとの混合造粒物を容易に作成することができ
る。本発明で得られた吸水性樹脂凝集体を用い吸水シー
トを製造する方法としては、種々挙げられるが、一例と
しては、例えば粉砕パルプ気流中に吸水性樹脂粒子を添
加し、ティッシュペーパー等のシート基材上に混合ウエ
ブを形成する。この混合ウエブに水を添加して吸水性樹
脂粒子に吸水させ、その後有機溶剤を添加して吸水性樹
脂粒子を凝集させ、加圧脱溶媒、乾燥等の工程を経てシ
ート状吸水体とする方法が挙げられる。The water-absorbent resin aggregate obtained according to the present invention can be granulated and formed by adding other substances such as a filler if necessary. For example, non-woven fabric or pulp when used in disposable diapers or pet sheets, or clay or fertilizer such as bentonite when used as a soil conditioner or civil engineering agent, which does not hinder the adsorption of water-absorbent resin particles If so, they can be used together regardless of the shape, composition, size and the like. When obtaining a water-absorbent resin aggregate obtained by mixing a filler and the like as necessary, there is no particular means for the mixing order when mixing the water-absorbent resin and the filler, but the filler and the water-absorbent resin are uniformly mixed. When blended granules and aggregates are desired, it is necessary to previously mix the extender and the water-absorbing resin. In general, a water-absorbent resin aggregate agglomerated by water and an organic solvent is used after drying, but can also be formed at a flexible stage before drying. For drying, it is preferable to dry under reduced pressure at around room temperature in order to remove the organic solvent taken into the resin. When the water-absorbent resin aggregate obtained by the present invention is used, a water-absorbing sheet such as a disposable diaper, a sanitary article, a urine absorbing pad, a pet sheet, and a cat granulated with a clay or a pulp such as a cat sand or an agricultural soil improving material can be used. Things can be created easily. As a method for producing a water-absorbent sheet using the water-absorbent resin aggregate obtained in the present invention, various examples are given.As an example, for example, a water-absorbent resin particle is added to a pulverized pulp stream, and a sheet such as a tissue paper is added. A mixed web is formed on a substrate. A method in which water is added to the mixed web to cause the water-absorbing resin particles to absorb water, and then an organic solvent is added to agglomerate the water-absorbing resin particles. Is mentioned.
【００１０】[0010]
【作用】本発明において、水の添加により、吸水性樹脂
粒子表面のカルボキシル基、スルホン酸基などの親水基
が配向し、その後、親水性有機溶剤と接触することによ
りそれらの親水基同士が吸着し、結果として吸水性樹脂
が造粒・凝集するという作用が奏されるものと思われ
る。これらの作用は、有機溶剤添加後に水を加えた場
合、又は水と有機溶剤とを同時に添加した場合にも多少
認められ、それなりの凝集体が得られるが、凝集強度の
強いものを得ることは不可能である。In the present invention, the addition of water orients hydrophilic groups such as carboxyl groups and sulfonic acid groups on the surface of the water-absorbent resin particles, and then adsorbs the hydrophilic groups by contact with a hydrophilic organic solvent. As a result, it is considered that the effect that the water-absorbent resin is granulated and aggregated is exerted. These effects are somewhat observed when water is added after the addition of the organic solvent, or when water and the organic solvent are added at the same time, and a certain aggregate is obtained, but it is not possible to obtain a strong aggregate. Impossible.
【００１１】[0011]
【実施例】以下実施例により、本発明を具体的に説明す
るが、本発明はこれらの実施例により限定されるもので
はない。 実施例１ アクリル酸ナトリウムを主成分とする吸水性樹脂粒子(1
4mesh篩下)１００重量部に水５０重量部を添加して吸水
させた後、２０℃の温度条件下にアセトン(比誘電率２
０.７)２００重量部を加え、スパーテルで軽くかき混ぜ
た。得られたガム状の吸水性樹脂凝集体を３時間真空乾
燥した後以下の評価試験を行った。 実施例２ ２０℃の温度条件下でアクリル酸及び2-アクリルアミド
-2-メチルプロパンスルホン酸の共重合体の部分軽金属
塩を主成分とする吸水性樹脂粒子(14mesh篩下)１００重
量部に水５０重量部を添加して吸水させた後、イソプロ
ピルアルコール(比誘電率２０.３)２００重量部を加
え、スパーテルで軽くかき混ぜた。得られたガム状の吸
水性樹脂凝集体を３時間真空乾燥した後以下の評価試験
を行った。 実施例３ ２０℃の温度条件下でアクリル酸ナトリウムを主成分と
する吸水性樹脂粒子(14mesh篩下)１００重量部に水１０
重量部を添加して吸水させた後、アセトン５０重量部を
加え、スパーテルで軽くかき混ぜた。得られたガム状の
吸水性樹脂凝集体を３時間真空乾燥した後以下の評価試
験を行った。 実施例４ ２０℃の温度条件下でアクリル酸ナトリウムを主成分と
する吸水性樹脂粒子(14mesh篩下)１００重量部に水１０
重量部を添加して吸水させた後、アセトン２００重量部
を加え、スパーテルで軽くかき混ぜた。得られたガム状
の吸水性樹脂凝集体を３時間真空乾燥した後以下の評価
試験を行った。 実施例５ ２０℃の温度条件下でアクリル酸ナトリウムを主成分と
する吸水性樹脂粒子(14mesh篩下)１００重量部に水２０
０重量部を添加して吸水させた後、アセトン２００重量
部を加え、スパーテルで軽くかき混ぜた。得られたガム
状の吸水性樹脂凝集体を３時間真空乾燥した後以下の評
価試験を行った。 実施例６ ２０℃の温度条件下でアクリル酸ナトリウムを主成分と
する吸水性樹脂粒子(14mesh篩下)１００重量部に水５０
重量部を添加して吸水させた後、エチルアルコール(比
誘電率２４.６)２００重量部を加え、スパーテルで軽く
かき混ぜた。得られたガム状の吸水性樹脂凝集体を３時
間真空乾燥した後以下の評価試験を行った。 実施例７ ２０℃の温度条件下でアクリル酸ナトリウムを主成分と
する吸水性樹脂粒子(14mesh篩下)１００重量部に水５０
重量部を添加して吸水させた後、アセトン１００重量
部、イソプロピルアルコール１００重量部を加え、スパ
ーテルで軽くかき混ぜた。得られたガム状の吸水性樹脂
凝集体を３時間真空乾燥した後以下の評価試験を行っ
た。 実施例８ ２０℃の温度条件下でアクリル酸ナトリウムを主成分と
する吸水性樹脂粒子(14mesh篩下)１００重量部に水５０
重量部を添加して吸水させた後、アセトニトリル(比誘
電率３７.５)２００重量部を加え、スパーテルで軽くか
き混ぜた。得られたガム状の吸水性樹脂凝集体を３時間
真空乾燥した後以下の評価試験を行った。 実施例９ アクリル酸ナトリウムを主成分とする吸水性樹脂粒子(1
4mesh篩下)１００重量部に水５０重量部を添加して吸水
させた後、４０℃に加温したエチルアルコール(４０℃
での比誘電率２２.２)２００重量部を加え、スパーテル
で軽くかき混ぜた。得られたガム状の吸水性樹脂凝集体
を３時間真空乾燥した後以下の評価試験を行った。 実施例１０ ２０℃の温度条件下でアクリル酸ナトリウムを主成分と
する微粉末上吸水性樹脂(100mesh篩下)８０重量部に微
細化した木粉２０重量部を加えて良くかき混ぜた後水５
０重量部を添加して吸水させた。さらにエチルアルコー
ル２００重量部を加え、スパーテルで軽くかき混ぜた。
得られたガム状の吸水性樹脂凝集体を３時間真空乾燥し
た後以下の評価試験を行った。EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. Example 1 Water-absorbing resin particles containing sodium acrylate as a main component (1
50 parts by weight of water was added to 100 parts by weight of water (under 4 mesh sieve) to absorb water, and then acetone (relative dielectric constant of 2) was added at a temperature of 20 ° C.
0.7) 200 parts by weight were added and lightly stirred with a spatula. The obtained gum-like water-absorbent resin aggregate was vacuum-dried for 3 hours, and the following evaluation test was performed. Example 2 Acrylic acid and 2-acrylamide at a temperature of 20 ° C.
50 parts by weight of water was added to 100 parts by weight of water-absorbing resin particles (under a 14 mesh sieve) containing a partial light metal salt of a copolymer of 2-methylpropanesulfonic acid as a main component, and water was absorbed. Dielectric constant 20.3) 200 parts by weight were added, and the mixture was lightly stirred with a spatula. The obtained gum-like water-absorbent resin aggregate was vacuum-dried for 3 hours, and the following evaluation test was performed. Example 3 Water was added to 100 parts by weight of water-absorbent resin particles containing sodium acrylate as a main component (under a 14 mesh sieve) at a temperature of 20 ° C.
After adding 50 parts by weight of acetone, 50 parts by weight of acetone was added, and the mixture was stirred gently with a spatula. The obtained gum-like water-absorbent resin aggregate was vacuum-dried for 3 hours, and the following evaluation test was performed. Example 4 At a temperature of 20 ° C., 100 parts by weight of water-absorbent resin particles containing sodium acrylate as a main component (under a 14 mesh sieve) were mixed with 10 parts of water.
After adding water by weight and adding 200 parts by weight of acetone, the mixture was gently stirred with a spatula. The obtained gum-like water-absorbent resin aggregate was vacuum-dried for 3 hours, and the following evaluation test was performed. Example 5 Water was added to 100 parts by weight of water-absorbent resin particles containing sodium acrylate as a main component (under a 14 mesh sieve) at a temperature of 20 ° C.
After adding 0 parts by weight and absorbing water, 200 parts by weight of acetone was added, and the mixture was gently stirred with a spatula. The obtained gum-like water-absorbent resin aggregate was vacuum-dried for 3 hours, and the following evaluation test was performed. Example 6 Water was added to 100 parts by weight of water-absorbing resin particles containing sodium acrylate as a main component (under a 14 mesh sieve) at a temperature of 20 ° C.
After adding water by weight, 200 parts by weight of ethyl alcohol (dielectric constant: 24.6) was added, and the mixture was lightly stirred with a spatula. The obtained gum-like water-absorbent resin aggregate was vacuum-dried for 3 hours, and the following evaluation test was performed. Example 7 Water was added to 100 parts by weight of water-absorbent resin particles containing sodium acrylate as a main component (under a 14 mesh sieve) at a temperature of 20 ° C.
After the addition of 100 parts by weight of acetone and 100 parts by weight of isopropyl alcohol, the mixture was lightly stirred with a spatula. The obtained gum-like water-absorbent resin aggregate was vacuum-dried for 3 hours, and the following evaluation test was performed. Example 8 Water was added to 100 parts by weight of water-absorbing resin particles containing sodium acrylate as a main component (under a 14 mesh sieve) at a temperature of 20 ° C.
Then, 200 parts by weight of acetonitrile (relative dielectric constant: 37.5) was added, and the mixture was gently stirred with a spatula. The obtained gum-like water-absorbent resin aggregate was vacuum-dried for 3 hours, and the following evaluation test was performed. Example 9 Water-absorbing resin particles containing sodium acrylate as a main component (1
50 parts by weight of water was added to 100 parts by weight of water (under 4 mesh sieve) to absorb water, and then ethyl alcohol (40 ° C.) heated to 40 ° C.
22.2) 200 parts by weight were added, and the mixture was stirred gently with a spatula. The obtained gum-like water-absorbent resin aggregate was vacuum-dried for 3 hours, and the following evaluation test was performed. Example 10 At 20 ° C., 20 parts by weight of finely divided wood flour were added to 80 parts by weight of a water-absorbent resin on fine powder containing sodium acrylate as a main component (under a 100 mesh sieve), and the mixture was stirred well.
0 parts by weight was added to absorb water. Further, 200 parts by weight of ethyl alcohol was added, and the mixture was gently stirred with a spatula.
The obtained gum-like water-absorbent resin aggregate was vacuum-dried for 3 hours, and the following evaluation test was performed.
【００１２】比較例１ アクリル酸ナトリウムを主成分とする吸水性樹脂粒子(1
4mesh篩下)１００重量部に、水５０重量部を加え、スパ
ーテルで軽くかき混ぜて吸水させて得た吸水性樹脂を３
時間真空乾燥して以下の評価試験に供した。 比較例２ アクリル酸ナトリウムを主成分とする吸水性樹脂粒子(1
4mesh篩下)１００重量部に、アセトン２００重量部を加
え、スパーテルで軽くかき混ぜて得た吸水性樹脂を３時
間真空乾燥して以下の評価試験に供した。 比較例３ アクリル酸ナトリウムを主成分とする吸水性樹脂粒子(1
4mesh篩下)１００重量部に、水とアセトンの混合溶剤
(１／１)を２００重量部を加え、スパーテルで軽くかき
混ぜて吸水させて得た吸水性樹脂を３時間真空乾燥して
以下の評価試験に供した。 比較例４ アクリル酸ナトリウムを主成分とする吸水性樹脂粒子(1
4mesh篩下)１００重量部に、アセトン２００重量部を加
えた後、水５０重量部を加え、スパーテルで軽くかき混
ぜて得た吸水性樹脂を３時間真空乾燥して以下の評価試
験に供した。 比較例５ アクリル酸ナトリウムを主成分とする吸水性樹脂粒子(1
4mesh篩下)８０重量部に、微細化した木粉２０重量部を
加えて良くかき混ぜた後、水１００重量部を加えて吸水
させて得た吸水性樹脂をφ３.２mmの排出口のついたミ
ートチョッパーに入れて押し出し成形して得た吸水性樹
脂を１３０℃で３時間加熱乾燥して以下の評価試験に供
した。 比較例６ アクリル酸ナトリウムを主成分とする吸水性樹脂粒子(1
4mesh篩下)２０重量部に、ベントナイト１０重量部、建
設用骨材７０重量部を加えて良くかき混ぜた後、水１０
０重量部を加えて吸水させて得た吸水性樹脂をφ３.２m
mの排出口のついたミートチョッパーに入れて押し出し
成形して得た吸水性樹脂を１３０℃で３時間加熱乾燥し
て以下の評価試験に供した。Comparative Example 1 Water-absorbing resin particles (1) containing sodium acrylate as a main component
(4mesh sieve) 100 parts by weight, 50 parts by weight of water are added, and the mixture is stirred lightly with a spatula to absorb water.
After vacuum drying for hours, it was subjected to the following evaluation test. Comparative Example 2 Water-absorbing resin particles containing sodium acrylate as a main component (1
200 parts by weight of acetone was added to 100 parts by weight (under a 4 mesh sieve), and the water-absorbent resin obtained by lightly stirring with a spatula was vacuum-dried for 3 hours and subjected to the following evaluation test. Comparative Example 3 Water-absorbing resin particles containing sodium acrylate as a main component (1
4mesh sieve) 100 parts by weight, mixed solvent of water and acetone
200 parts by weight of (1/1) was added, the mixture was gently stirred with a spatula to absorb water, and the resulting water-absorbent resin was vacuum-dried for 3 hours and subjected to the following evaluation test. Comparative Example 4 Water-absorbing resin particles containing sodium acrylate as a main component (1
200 parts by weight of acetone was added to 100 parts by weight (under 4 mesh sieve), 50 parts by weight of water was added, and the water-absorbing resin obtained by lightly stirring with a spatula was vacuum-dried for 3 hours and subjected to the following evaluation test. Comparative Example 5 Water-absorbing resin particles containing sodium acrylate as a main component (1
20 parts by weight of finely divided wood flour was added to 80 parts by weight under a 4 mesh sieve, and the mixture was stirred well, and then 100 parts by weight of water was added to absorb water. The water-absorbent resin obtained by extrusion molding in a meat chopper was dried by heating at 130 ° C. for 3 hours and subjected to the following evaluation tests. Comparative Example 6 Water-absorbing resin particles containing sodium acrylate as a main component (1
4mesh sieve) 20 parts by weight, 10 parts by weight of bentonite and 70 parts by weight of construction aggregate are added and mixed well.
Water-absorbent resin obtained by adding 0 parts by weight and absorbing water is φ3.2 m
A water-absorbent resin obtained by extrusion into a meat chopper with a discharge port of m was heated and dried at 130 ° C. for 3 hours and subjected to the following evaluation test.
【００１３】評価試験 上記の様にして得た実施例１〜実施例１０の吸水性樹脂
凝集体及び比較例１〜比較例６の吸水性樹脂並びにアク
リル酸ナトリウムを主成分とする吸水性樹脂粒子(14mes
h篩下／ブランク１)及びアクリル酸及び2-アクリルアミ
ド-2-メチルプロパンスルホン酸の共重合体の部分軽金
属塩を主成分とする吸水性樹脂粒子(14mesh篩下／ブラ
ンク２)について以下の方法で評価試験を行い、その結
果を表１に示す。Evaluation Test The water-absorbent resin aggregates of Examples 1 to 10 obtained as described above, the water-absorbent resins of Comparative Examples 1 to 6, and the water-absorbent resin particles mainly containing sodium acrylate (14mes
h Under sieve / blank 1) and water-absorbing resin particles (14 mesh under sieve / blank 2) containing water-absorbent resin particles mainly composed of a partially light metal salt of a copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid An evaluation test was performed in Table 1, and the results are shown in Table 1.
【００１４】○吸水量測定方法 １,０００mlの０.９％生理食塩水中に幅１０cm、高さ１
５cmの２００メッシュ濾布からなる袋を浸漬し、１５分
間吊して水切りした後、重量を測定し、この袋の空重量
(Ｗ0)とする。この袋の中へ、サンプル１.００gを入
れ、再度１,０００mlの０.９％生理食塩水中に浸漬し、
１時間後袋を取り出し、１５分間水切りした後に重量を
測定する(Ｗ1)。 吸水量（g／g）＝Ｗ1−Ｗ0 ○吸水速度測定方法 １００mlビーカーにサンプル２.００gを入れ、そこへ、
２５℃に調整した０.９％生理食塩水５０mlを静かに加
え、ストップウォッチをスタートさせる。サンプルが膨
潤し、液が樹脂表面から無くなるまでの時間を測定す
る。 ○凝集力評価 目視及び触感により以下の様に区分けした。 ５：非常に固い凝集 ４：固い凝集 ３：良好 ２：弱い １：粉末状態The method for measuring water absorption: 1,000 ml of 0.9% physiological saline in a width of 10 cm and a height of 1
A bag made of a 5 cm 200-mesh filter cloth is immersed, suspended for 15 minutes and drained, weighed, and emptied of the bag.
(W 0 ). Into this bag, put 1.00 g of sample, and immerse it again in 1,000 ml of 0.9% saline,
After 1 hour, the bag is taken out, drained for 15 minutes, and then weighed (W 1 ). Water absorption (g / g) = W 1 -W 0 ○ Method of measuring water absorption rate Place 2.00 g of sample in a 100 ml beaker,
50 ml of 0.9% saline adjusted to 25 ° C is gently added, and the stopwatch is started. The time until the sample swells and the liquid disappears from the resin surface is measured. ○ Evaluation of cohesive strength The following classification was made based on visual and tactile sensations. 5: very hard agglomeration 4: hard agglomeration 3: good 2: weak 1: powder state
【００１５】[0015]
【表１】 [Table 1]
【００１６】実施例１１ 木材パルプシート(ウェアハウザー製サーザンパインＫ
Ｐパルプ)を粉砕し、そのパルプ気流中にアクリル酸ナ
トリウムを主成分とする吸水性樹脂粒子(１００〜１４
０メッシュ品)を添加して、ティッシュペーパー上に１
３０g/m2の吸水性樹脂粒子と１５０g/m2のパルプを含む
混合ウェブを形成した。この混合ウェブを上下プラスチ
ックネットにはさみ、プラスチックパットに入れてイオ
ン交換水を１００g/m2相当霧状にして上下にスプレイし
て、約１分間放置後、アセトンを３００g/m2相当分スプ
レイして添加後、加圧脱溶媒乾燥した。得られたシート
は厚い不織布状の形態を示し、折り畳んでも破れないシ
ート状となっていた。このシートを分解し、吸水性樹脂
の形状を調べた。吸水性樹脂は粒状の形態にはなく、ホ
ットメルト接着剤の溶融状態に似た形状で、パルプと強
く結合していた。 実施例１２ 片面起毛処理をしたＴＣＦ不織布(二村化学製＃４０３)
に実施例１に用いた吸水性樹脂粒子１５０g/m2相当分を
メッシュをバイブレートしながら均一にまぶし、これを
パット内において吸水性樹脂面に約１００g/m2相当分の
水分をスプレーし１分間放置した。吸水性樹脂は一部膨
潤したが粒子状態を保っていた。この状態の吸水性樹脂
粒子に５００g/m2相当分のアセトンを添加し、１分間放
置後、脱溶媒、乾燥を行った。表面の吸水性樹脂はスポ
ンジ状の形態をとって不織布に強固に結合していた。吸
水性樹脂表面にセロテープの粘着部を当て剥離テストを
試みたが、不織布からの剥離もなく、また吸水性樹脂の
剥離も観察されなかった。Example 11 Wood pulp sheet (Southern Pine K manufactured by Warehauser)
P pulp) is pulverized, and water-absorbent resin particles (100 to 14) containing sodium acrylate as a main component in the pulp stream.
0 mesh product) and add 1 on tissue paper.
A mixed web containing 30 g / m 2 of water-absorbent resin particles and 150 g / m 2 of pulp was formed. This mixed web is sandwiched between upper and lower plastic nets, put in a plastic pad, and ion-exchanged water is sprayed up and down in an atomized state equivalent to 100 g / m 2. After standing for about 1 minute, acetone is sprayed in an amount equivalent to 300 g / m 2. After the addition, the solvent was removed by drying under pressure. The obtained sheet was in the form of a thick non-woven fabric, and had a sheet shape that could not be broken even when folded. This sheet was disassembled and the shape of the water-absorbing resin was examined. The water-absorbing resin was not in a granular form but in a shape similar to the molten state of the hot melt adhesive, and was strongly bonded to the pulp. Example 12 TCF nonwoven fabric subjected to single-side brushing treatment (# 403 manufactured by Nimura Chemical Co., Ltd.)
Then, 150 g / m 2 equivalent of the water-absorbing resin particles used in Example 1 was evenly sprayed while vibrating a mesh, and sprayed with water equivalent to about 100 g / m 2 on the surface of the water-absorbing resin in the pad. Left for 1 minute. The water-absorbent resin partially swelled, but maintained a particle state. Acetone equivalent to 500 g / m 2 was added to the water-absorbent resin particles in this state, left for 1 minute, and then the solvent was removed and dried. The water-absorbent resin on the surface took a sponge-like form and was strongly bonded to the nonwoven fabric. A peel test was conducted by placing an adhesive portion of a cellophane tape on the surface of the water-absorbent resin, but no peeling from the nonwoven fabric was observed, and no peeling of the water-absorbent resin was observed.
【００１７】[0017]
【発明の効果】本発明により、すなわち吸水性樹脂に水
を吸水させた後親水性有機溶剤と混ぜることによって、
吸水性樹脂凝集体が容易に得られ、凝集物を成形する場
合などを除いて、圧力、熱、バインダー等を要しない。
また、粒径の大きなものから細かなものまで、更に粒子
径が不均一でも容易に凝集化することができる。こうし
て得られた吸水性樹脂凝集体は、その後の造粒や成形が
容易なものであり、微粉末も存在しないことから、吸水
性樹脂粉末取扱作業場の作業環境を著しく改善するもの
である。さらに本発明で得られる吸水性樹脂凝集体は、
特に強い力を加えることがない限り、その凝集形状が崩
れることはなく、凝集することによって従来損なわれて
きた吸水速度や吸水量もほとんど凝集以前と変わること
なく、吸水性樹脂としての特性を十分に発揮するもので
ある。According to the present invention, the water-absorbent resin is made to absorb water and then mixed with a hydrophilic organic solvent.
A water-absorbent resin aggregate is easily obtained, and does not require pressure, heat, a binder, and the like, except in the case of forming an aggregate.
In addition, agglomeration can be easily performed even if the particle diameter is not uniform, from a large particle diameter to a fine particle diameter. The water-absorbent resin aggregate thus obtained can be easily granulated and formed thereafter, and since there is no fine powder, the working environment of the water-absorbent resin powder handling workplace is remarkably improved. Further, the water-absorbent resin aggregate obtained in the present invention,
Unless a particularly strong force is applied, the aggregation shape does not collapse, and the water absorption rate and amount of water that have been impaired by aggregation are almost the same as before aggregation, and the characteristics as a water-absorbent resin are sufficient. It is effective in
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高橋 彰 愛知県犬山市羽黒字中深田１−11 (72)発明者 野村 幸司 愛知県名古屋市港区船見町１番地の１ 東 亞合成株式会社名古屋総合研究所内 (72)発明者 阿津地 稔 愛知県名古屋市港区船見町１番地の１ 東 亞合成株式会社名古屋総合研究所内 (72)発明者 山田 みゆき 東京都港区西新橋一丁目14番１号 東亞合 成株式会社内 (72)発明者 岡田 稔 東京都港区西新橋一丁目14番１号 東亞合 成株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Takahashi 1-11 Nakafuka, Haguro, Inuyama City, Aichi Prefecture (72) Inventor Koji Nomura 1 1 Funamicho, Minato-ku, Nagoya City, Aichi Nagoya, Japan Inside the Research Institute (72) Inventor Minoru Atsuchi 1 at Funami-cho, Minato-ku, Nagoya City, Aichi Prefecture East Nagoya Co., Ltd.Nagoya Research Institute (72) Inventor Miyuki Yamada 1-14-1 Nishishinbashi, Minato-ku, Tokyo In Toagosei Co., Ltd. (72) Inventor Minoru Okada 1-14-1 Nishishinbashi, Minato-ku, Tokyo
Claims (3)
溶剤を添加することにより前記粒子を凝集させることを
特徴とする吸水性樹脂凝集体の製造方法。1. A method for producing a water-absorbent resin aggregate, comprising adding a hydrophilic organic solvent to water-absorbed water-absorbent resin particles to aggregate the particles.
水した１００重量部の吸水性樹脂粒子に親水性有機溶剤
５０重量部以上を添加することにより前記粒子を凝集さ
せることを特徴とする吸水性樹脂凝集体の製造方法。2. The method according to claim 1, wherein 50 parts by weight or more of a hydrophilic organic solvent is added to 100 parts by weight of water-absorbent resin particles having absorbed water at a weight ratio of 1/100 to 2 times to agglomerate the particles. Of producing a water-absorbent resin aggregate.
ート状となし、該粒子を請求項１又は請求項２に記載の
吸水性樹脂凝集体の製造方法で凝集体とすることを特徴
とするシート状吸水体の製造方法。3. A method of producing a water-absorbent resin aggregate according to claim 1 or 2, wherein the water-absorbent resin particles coexist with fibers to form a sheet, and the particles are formed into an aggregate by the method for producing a water-absorbent resin aggregate according to claim 1 or 2. For producing a sheet-shaped water absorbing body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14467497A JP3883140B2 (en) | 1997-05-19 | 1997-05-19 | Water-absorbing resin aggregate and method for producing sheet-shaped water-absorbing body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14467497A JP3883140B2 (en) | 1997-05-19 | 1997-05-19 | Water-absorbing resin aggregate and method for producing sheet-shaped water-absorbing body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10316874A true JPH10316874A (en) | 1998-12-02 |
| JP3883140B2 JP3883140B2 (en) | 2007-02-21 |
Family
ID=15367615
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14467497A Expired - Lifetime JP3883140B2 (en) | 1997-05-19 | 1997-05-19 | Water-absorbing resin aggregate and method for producing sheet-shaped water-absorbing body |
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| Country | Link |
|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2159252A4 (en) * | 2007-06-19 | 2013-12-04 | Sumitomo Seika Chemicals | Method for producing granulated carboxyl group-containing polymer particle and granulated carboxyl group-containing polymer particle |
-
1997
- 1997-05-19 JP JP14467497A patent/JP3883140B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2159252A4 (en) * | 2007-06-19 | 2013-12-04 | Sumitomo Seika Chemicals | Method for producing granulated carboxyl group-containing polymer particle and granulated carboxyl group-containing polymer particle |
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| Publication number | Publication date |
|---|---|
| JP3883140B2 (en) | 2007-02-21 |
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