JP5596526B2 - Composition for water absorption modification of water absorbent resin particles - Google Patents
Composition for water absorption modification of water absorbent resin particles Download PDFInfo
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本発明は、吸水性樹脂粒子の吸水性改質用組成物に関する。 The present invention relates to a composition for water absorption modification of water absorbent resin particles.
使い捨ておむつ、生理用ナプキン、失禁パッド等の吸収性物品の吸収体には、尿や経血等の液の吸収容量を増大させること等を目的として、吸水性ポリマー等と呼ばれる吸水性樹脂粒子が配合されることが多い。
また、そのような吸水性樹脂粒子の吸収速度を向上させる技術として、表面の凹凸を多くし多孔質化する技術が提案されている（特許文献１，２参照）。
Absorbents of absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads have water absorbent resin particles called water absorbent polymers for the purpose of increasing the absorption capacity of liquids such as urine and menstrual blood. Often blended.
In addition, as a technique for improving the absorption rate of such water-absorbent resin particles, a technique for increasing the surface unevenness and making it porous has been proposed (see Patent Documents 1 and 2).
また、特許文献３には、ＨＬＢが７以上の非イオン系界面活性剤存在下で、水溶液重合して得た吸水性樹脂粒子が提案され、その吸水性樹脂粒子は、比較的疎水性の界面活性剤が粒子表面に均一に分布するため、初期吸収速度が大きいことが開示されている。 Patent Document 3 proposes a water-absorbing resin particle obtained by aqueous solution polymerization in the presence of a nonionic surfactant having an HLB of 7 or more, and the water-absorbing resin particle has a relatively hydrophobic interface. It is disclosed that the initial absorption rate is large because the active agent is uniformly distributed on the particle surface.
特許文献１，２に提案される吸水性樹脂粒子のように、見かけの比表面積を大きくした吸水性樹脂粒子は、その形状が壊れ易く、輸送中や吸収体の製造工程において散布投下する際に、粒子表面が砕け、微粒子が発生したり吸収性能が低下するという問題が生じ易い。また比表面積の増大により、輸送効率を悪くしたり、大きな貯蔵スペースが必要になるなどの問題も生じる。
また、特許文献３の技術は、吸収速度の向上効果が不十分であった。
Like the water-absorbent resin particles proposed in Patent Documents 1 and 2, the water-absorbent resin particles having a large apparent specific surface area are fragile in shape, and when being sprayed and dropped during transportation or in the manufacturing process of the absorber. The problem is that the particle surface is crushed and fine particles are generated or the absorption performance is lowered. Moreover, the increase in specific surface area also causes problems such as poor transportation efficiency and the need for a large storage space.
Moreover, the technique of patent document 3 was inadequate in the improvement effect of the absorption rate.
従って、本発明の課題は、吸水性樹脂粒子の吸収速度を、吸収量の低下等を抑えながら効果的に向上させ得る吸水性樹脂粒子の吸水性改質用組成物、その吸水性改質用組成物によって吸収速度が向上した改質吸水性樹脂粒子、該改質吸水性樹脂粒子を用いた吸収体、及び前記改質吸水性樹脂粒子の効率的な製造方法等を提供することにある。 Accordingly, an object of the present invention is to provide a composition for water-absorbing modification of water-absorbing resin particles that can effectively improve the absorption rate of the water-absorbing resin particles while suppressing a decrease in absorption amount, and the like. An object of the present invention is to provide modified water-absorbing resin particles whose absorption rate is improved by the composition, an absorbent body using the modified water-absorbing resin particles, an efficient method for producing the modified water-absorbing resin particles, and the like.
本発明の吸水性樹脂粒子の吸水性改質用組成物は、（ａ）下記一般式（１）
Ｒ1Ｏ−（ＥＯ）k−Ｈ ・・・（１）
〔式中、Ｒ1は炭素数８〜１８のアルキル基、ＥＯはオキシエチレン基、ｋは４〜１２の数を示す。〕
で表される化合物、及び
（ｂ）下記一般式（２）
Ｒ2Ｏ−（ＰＯ）p−Ｈ ・・・（２）
〔式中、Ｒ2は炭素数４〜１２のアルキル基、ＰＯはオキシプロピレン基、ｐは１〜７の数を示す。〕
で表される化合物を含む。
The composition for water absorption modification of the water absorbent resin particles of the present invention comprises (a) the following general formula (1):
R 1 O— (EO) k —H (1)
[Wherein, R 1 represents an alkyl group having 8 to 18 carbon atoms, EO represents an oxyethylene group, and k represents a number of 4 to 12]. ]
And (b) the following general formula (2)
R 2 O- (PO) p- H ··· (2)
[Wherein R 2 represents an alkyl group having 4 to 12 carbon atoms, PO represents an oxypropylene group, and p represents a number of 1 to 7. ]
The compound represented by these is included.
本発明の吸水性樹脂粒子の吸水性改質用組成物によれば、吸水性樹脂粒子の吸収速度を、吸収量の低下等を抑えながら効果的に向上させることができる。
本発明の改質吸水性樹脂粒子は、吸収速度及び吸収量に優れている。
本発明の吸収体は、前記改質吸水性樹脂粒子を含むことによって優れた吸収性能を有する。
本発明の改質吸水性樹脂粒子の製造方法によれば、前記改質吸水性樹脂粒子を容易且つ効率的に製造可能である。
According to the composition for water absorption modification of the water absorbent resin particles of the present invention, the absorption rate of the water absorbent resin particles can be effectively improved while suppressing a decrease in the amount of absorption.
The modified water-absorbent resin particles of the present invention are excellent in absorption rate and absorption amount.
The absorber of the present invention has excellent absorption performance by including the modified water absorbent resin particles.
According to the method for producing modified water absorbent resin particles of the present invention, the modified water absorbent resin particles can be produced easily and efficiently.
以下本発明を、その好ましい実施形態に基づき説明する。 Hereinafter, the present invention will be described based on preferred embodiments thereof.
〔吸水性改質用組成物〕
本発明の吸水性樹脂粒子の吸水性改質用組成物は、下記（ａ）成分及び下記（ｂ）成分を含んでなる。なお、本発明の組成物としては、完全溶解型（乳化型も含む）の水溶液の形態が好ましいが、その他、分散液形態、成分の一部が溶解し残部は分散した状態の懸濁状態にある水系の組成物、極性有機溶媒（メタノール、エタノール等）系の組成物、又は水とこれら極性有機溶媒との混合溶液系の組成物等の形態であっても良い。
[Composition for water absorption modification]
The composition for water absorption modification of the water absorbent resin particles of the present invention comprises the following component (a) and the following component (b). In addition, the composition of the present invention is preferably in the form of a completely dissolved (including emulsified) aqueous solution, but in addition, in the form of a dispersion, a part of the components are dissolved and the remainder is in a dispersed state. It may be in the form of a certain aqueous composition, a polar organic solvent (methanol, ethanol, etc.) composition, or a mixed solution system composition of water and these polar organic solvents.
＜（ａ）成分＞
（ａ）成分は、下記一般式（１）で表される化合物である。
Ｒ1Ｏ−（ＥＯ）k−Ｈ ・・・（１）
〔式中、Ｒ1は炭素数８〜１８のアルキル基、ＥＯはオキシエチレン基、ｋは４〜１２の数を示す。〕
一般式（１）中のＲ1は、炭素数が８〜１８のアルキル基であり、好ましくは炭素数が８〜１６であり、より好ましくは８〜１４である。炭素数８〜１８のアルキル基は、直鎖または分岐鎖のものが挙げられ、具体例としては、オクチル基、ノニル基、デシル基、ラウリル基（ドデシル基）、セチル基、イソセチル基、ステアリル基、イソステアリル基、オレイル基、ミリスチル基等が挙げられる。
また、アルキル基は、直鎖のアルキル基であることが好ましい。
また、異なるアルキル基を有する複数種類のポリオキシエチレンアルキルエーテルの混合物を用いることもできる。
<(A) component>
The component (a) is a compound represented by the following general formula (1).
R 1 O— (EO) k —H (1)
[Wherein, R 1 represents an alkyl group having 8 to 18 carbon atoms, EO represents an oxyethylene group, and k represents a number of 4 to 12]. ]
R 1 in the general formula (1) is an alkyl group having 8 to 18 carbon atoms, preferably 8 to 16 carbon atoms, more preferably 8 to 14 carbon atoms. Examples of the alkyl group having 8 to 18 carbon atoms include straight chain or branched chain, and specific examples include octyl group, nonyl group, decyl group, lauryl group (dodecyl group), cetyl group, isocetyl group, stearyl group. , Isostearyl group, oleyl group, myristyl group and the like.
The alkyl group is preferably a linear alkyl group.
A mixture of a plurality of types of polyoxyethylene alkyl ethers having different alkyl groups can also be used.
一般式（１）中のｋは、平均付加モル数であり、吸収速度の向上をより効果的にする観点や、また、本発明の組成物は水溶液の形態であることが好ましいことから、水溶液の調整のし易さと取り扱い性の観点から、５〜１０であることが好ましく、より好ましくは６〜９である。 In the general formula (1), k is the average number of added moles, and it is preferable to improve the absorption rate more effectively, and the composition of the present invention is preferably in the form of an aqueous solution. From the viewpoint of ease of adjustment and handleability, it is preferably 5 to 10, more preferably 6 to 9.
（ａ）成分は、非イオン性界面活性剤であり、本発明の吸水性樹脂粒子の吸水性改質用組成物において、（ａ）成分は、吸水性樹脂粒子の表面を親水化し、液（尿）に対してなじみ易くするととともに、本発明の組成物を水溶液の形態とする場合に成分（ｂ）を水に溶解または乳化させる役割を果たすものと考えられる。
（ｂ）成分とともに供与して、好ましい親水性を吸水性樹脂粒子に付与し、また、本発明の吸水性改質用組成物を含む水溶液の調整のしやすさと取り扱い性の点から、（ａ）成分は、そのＨＬＢ値（グリフィン法による測定値）が、１０〜１５であることが好ましく、より好ましくは１１〜１４である。
Component (a) is a nonionic surfactant. In the composition for water absorption modification of the water absorbent resin particles of the present invention, the component (a) hydrophilizes the surface of the water absorbent resin particles, It is considered that it plays a role of dissolving or emulsifying the component (b) in water when the composition of the present invention is in the form of an aqueous solution.
From the viewpoint of ease of adjustment and handling of the aqueous solution containing the water-absorbing resin composition of the present invention by imparting with the component (b) a preferable hydrophilic property, The component H) preferably has an HLB value (measured by the Griffin method) of 10 to 15, more preferably 11 to 14.
＜（ｂ）成分＞
（ｂ）成分は、下記一般式（２）で表される化合物である。
Ｒ2Ｏ−（ＰＯ）p−Ｈ ・・・（２）
〔式中、Ｒ2は炭素数４〜１２のアルキル基、ＰＯはオキシプロピレン基、ｐは１〜７の数を示す。〕
一般式（２）中のＲ2は、炭素数が４〜１２のアルキル基であり、好ましくは炭素数が４〜１０であり、より好ましくは６〜９である。炭素数４〜１２のアルキル基は、直鎖または分岐鎖のものが挙げられ、具体例には、ブチル基、イソブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ラウリル基（ドデシル基）等が挙げられる。
また、アルキル基は、直鎖のアルキル基であることが好ましい。
また、異なるアルキル基を有する複数種類のポリオキシプロピレンアルキルエーテルの混合物を用いることもできる。
<(B) component>
The component (b) is a compound represented by the following general formula (2).
R 2 O- (PO) p- H ··· (2)
[Wherein R 2 represents an alkyl group having 4 to 12 carbon atoms, PO represents an oxypropylene group, and p represents a number of 1 to 7. ]
R 2 in the general formula (2) is an alkyl group having 4 to 12 carbon atoms, preferably 4 to 10 carbon atoms, and more preferably 6 to 9 carbon atoms. Examples of the alkyl group having 4 to 12 carbon atoms include straight chain or branched chain, and specific examples include butyl group, isobutyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, A lauryl group (dodecyl group) etc. are mentioned.
The alkyl group is preferably a linear alkyl group.
A mixture of a plurality of types of polyoxypropylene alkyl ethers having different alkyl groups can also be used.
一般式（２）中のｐは、平均付加モル数であり、吸水性樹脂粒子に適度な吸水速度向上を付与する観点、及び水溶液の組成物とする場合に上述した（ａ）成分と共存する水溶液の調整のし易さと安定性の観点から、２〜６であることが好ましく、より好ましくは２〜４である。 P in the general formula (2) is the average number of added moles, and coexists with the component (a) described above in terms of imparting an appropriate increase in water absorption rate to the water-absorbent resin particles and in the case of an aqueous solution composition. From the viewpoint of easy adjustment of the aqueous solution and stability, it is preferably 2 to 6, more preferably 2 to 4.
（ｂ）成分も、非イオン性界面活性剤であり、本発明の吸水性樹脂粒子の吸水性改質用組成物において、（ｂ）成分は、吸収性樹脂粒子表面に均一に付着し、（ａ）成分と化学的相互作用をすることにより吸水速度を向上させる役割を果たすものと考えられる。
（ｂ）成分は、吸水速度を向上させるに比較的疎水性であることが好ましく、そのＨＬＢ値（デイビス法による測定値）が、１〜１０であることが好ましく、より好ましくは３〜８である。
The component (b) is also a nonionic surfactant, and in the composition for water absorption modification of the water absorbent resin particles of the present invention, the component (b) is uniformly attached to the surface of the absorbent resin particles, a) It is considered to play a role of improving the water absorption rate by chemically interacting with the component.
The component (b) is preferably relatively hydrophobic in order to improve the water absorption rate, and the HLB value (measured by the Davis method) is preferably 1 to 10, more preferably 3 to 8. is there.
本発明の吸水性樹脂粒子の吸水性改質用組成物は、水溶液の状態に調製されていることが、吸水性樹脂粒子の処理の容易さ等の観点から好ましい。
吸水性改質用組成物の水溶液の調製は、任意の方法により行うことができるが、相対的に親油性であることの多い（ｂ）成分を水に懸濁または分散させ、それとは別に、相対的に親水性であることの多い（ａ）成分を別の水に溶解しておき、（ｂ）成分を含む懸濁または分散液に、（ａ）成分の水溶液を、徐徐に混合して調製することが好ましい。
The composition for water absorption modification of the water absorbent resin particles of the present invention is preferably prepared in the form of an aqueous solution from the viewpoint of ease of treatment of the water absorbent resin particles.
The aqueous solution of the water-absorbing modification composition can be prepared by any method, but the component (b), which is often relatively lipophilic, is suspended or dispersed in water. The component (a), which is often relatively hydrophilic, is dissolved in another water, and the aqueous solution of the component (a) is gradually mixed with the suspension or dispersion containing the component (b). It is preferable to prepare.
（ａ）成分と（ｂ）成分との配合比率（質量比，前者：後者）は、水溶液の調整のし易さおよび本発明における所望の吸収性能を得易いことから、１０：９０〜９０：１０であることが好ましく、より好ましくは３０：７０〜９０：１０であり、更に好ましくは４０：６０〜９０：１０であり、殊更好ましくは４０：６０〜７０：３０である。 Since the blending ratio (mass ratio, former: latter) of the component (a) and the component (b) is easy to adjust the aqueous solution and easily obtain the desired absorption performance in the present invention, 10:90 to 90: It is preferably 10, more preferably 30:70 to 90:10, still more preferably 40:60 to 90:10, and still more preferably 40:60 to 70:30.
なお、改質吸水性樹脂粒子には、所望により（ａ）成分及び（ｂ）成分以外の成分を添加しても良い。例えば、親水性のシリカ粒子（例えば、アエロジル２００，アエロジル３００（何れも日本アエロジル（株）社製））などが挙げられる。 In addition, you may add components other than (a) component and (b) component to modified water-absorbing resin particles if desired. Examples thereof include hydrophilic silica particles (for example, Aerosil 200 and Aerosil 300 (both manufactured by Nippon Aerosil Co., Ltd.)).
また、水溶液に調整した吸水性改質用組成物は、当該水溶液の質量に対する前記（ａ）成分及び前記（ｂ）成分の合計質量の割合が、０．０１〜１％であることが好ましく、より好ましくは０．０５〜０．５％である。 Further, in the composition for water absorption modification adjusted to an aqueous solution, the ratio of the total mass of the component (a) and the component (b) to the mass of the aqueous solution is preferably 0.01 to 1%. More preferably, it is 0.05 to 0.5%.
〔吸水性改質用組成物による改質処理〕
本発明の吸水性改質用組成物を用いて吸水性樹脂粒子の改質を行うには、例えば、前述のようにして、水溶液に調製した吸水性改質用組成物を、容器等に収容した吸水性樹脂粒子に、注入、散布又は滴下等により加え、それらを攪拌や振動等の任意の混合方法を用いて混合する。
この混合の際に、吸水性樹脂粒子は水分を吸収して膨潤するため、混合後に、吸水性樹脂粒子の乾燥を行う。膨潤した吸水性樹脂粒子の乾燥方法としては、吸水性樹脂粒子の乾燥方法として従来公知の各種の方法を特に制限なく用いることができ、例えば、２０〜２００℃程度に加熱する方法、熱風乾燥、減圧乾燥、赤外線乾燥等が挙げられる。
[Modification treatment with water-absorbing modification composition]
In order to modify the water-absorbent resin particles using the water-absorbing modification composition of the present invention, for example, the water-absorbing modification composition prepared in an aqueous solution as described above is accommodated in a container or the like. These are added to the water-absorbent resin particles by injection, spraying, dropping, or the like, and they are mixed using any mixing method such as stirring and vibration.
During the mixing, the water absorbent resin particles absorb water and swell so that the water absorbent resin particles are dried after mixing. As a method for drying the swollen water absorbent resin particles, various conventionally known methods can be used without particular limitation as a method for drying the water absorbent resin particles. For example, a method of heating to about 20 to 200 ° C., hot air drying, Examples include vacuum drying and infrared drying.
また、吸水性改質用組成物の吸水性樹脂粒子に対する添加量は、特に制限されないが、例えば、吸水性樹脂粒子がアクリル酸系のポリマーである場合、吸水性樹脂粒子に対する、前記（ａ）成分及び前記（ｂ）成分の合計添加量は、０．０３〜０．２質量％であることが好ましく、より好ましくは、０．０５〜０．１５質量％である。当該範囲とすることで、吸水性改質用組成物の適度な付着により、吸収性樹脂粒子内部への液の浸透を適度なものとし、吸収性能を向上させるものとが考えられる。
吸水性樹脂粒子に対する前記（ａ）成分及び前記（ｂ）成分の合計添加量は、吸水性樹脂粒子の質量に対する前記（ａ）成分及び前記（ｂ）成分の合計質量の割合である。
The amount of the water-absorbing modification composition added to the water-absorbent resin particles is not particularly limited. For example, when the water-absorbent resin particles are an acrylic acid-based polymer, The total addition amount of the component and the component (b) is preferably 0.03 to 0.2% by mass, and more preferably 0.05 to 0.15% by mass. By setting it as the said range, it is thought that the penetration of the liquid into the inside of an absorptive resin particle is moderated by moderate adhesion of the composition for water absorption modification, and the absorption performance is improved.
The total addition amount of the component (a) and the component (b) with respect to the water-absorbent resin particles is a ratio of the total mass of the component (a) and the component (b) with respect to the mass of the water-absorbent resin particles.
〔処理対象の吸水性樹脂粒子〕
吸水性改質用組成物で処理する対象の吸水性樹脂粒子としては、使い捨ておむつ、生理用ナプキン、失禁パッド等の吸収性物品の吸収体に、従来使用されている各種の組成や形状の吸水性樹脂粒子が挙げられる。吸水性樹脂粒子の構成樹脂としては、例えば、ポリアクリル酸ソーダ、（アクリル酸−ビニルアルコール）共重合体、ポリアクリル酸ソーダ架橋体、（デンプン−アクリル酸）グラフト重合体、（イソブチレン−無水マレイン酸）共重合体及びそのケン化物、ポリアクリル酸カリウム、並びにポリアクリル酸セシウム等が挙げられ、これらの１種を単独で又は２種以上を混合して用いることができる。
また、吸水性樹脂粒子には、その形状の違いから、不定形タイプ、塊状タイプ、俵状タイプ、球粒凝集タイプ、球状タイプ等があるが、何れのタイプも用いることができる。
[Water-absorbent resin particles to be treated]
The water-absorbing resin particles to be treated with the water-absorbing modifying composition include water-absorbing materials having various compositions and shapes conventionally used in absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads. Resin particles. Examples of the resin constituting the water-absorbent resin particles include polyacrylic acid soda, (acrylic acid-vinyl alcohol) copolymer, polyacrylic acid soda crosslinked product, (starch-acrylic acid) graft polymer, and (isobutylene-anhydrous maleic acid). Acid) copolymers and saponified products thereof, potassium polyacrylate, cesium polyacrylate, and the like, and these can be used alone or in admixture of two or more.
In addition, the water-absorbent resin particles include an indeterminate type, a block type, a bowl type, a spherical particle agglomeration type, a spherical type and the like due to the difference in shape, and any type can be used.
吸水性改質用組成物で処理する対象の吸水性樹脂粒子は、（メタ）アクリル酸又はその塩を主単位とし、水溶液重合によって得られたものであることが更に好ましい。
（メタ）アクリル酸又はその塩を主単位とする吸水性樹脂としては、アクリル酸若しくはメタクリル酸又はそれらの塩（アルカリ金属塩、アンモニウム塩等）の重合体又は共重合体があり、ポリアクリル酸及びその塩並びにポリメタクリル酸及びその塩を例示することができる。ポリアクリル酸塩やポリメタクリル酸塩としては、ナトリウム塩、カリウム塩、アンモニウム塩等を好ましく用いることができるが、アルカリ金属塩、特にナトリウム塩が好ましい。また、アクリル酸又はメタクリル酸にマレイン酸、イタコン酸、アクリルアミド、２−アクリルアミド−２−メチルプロパンスルホン酸、２−（メタ）アクリロイルエタンスルホン酸、２−ヒドロキシエチル（メタ）アクリレート又はスチレンスルホン酸等のコモノマーを吸水性樹脂粒子の性能を低下させない範囲で共重合せしめた共重合体も、アクリル酸又はその塩を主単位とする吸水性樹脂粒子として好ましく使用し得る。
（メタ）アクリル酸又はその塩を主単位とする吸水性樹脂は、（メタ）アクリル酸の中和度は５０〜８０％であることが好ましい。吸水性樹脂粒子は水を含んでいても良い。
More preferably, the water-absorbent resin particles to be treated with the water-absorbing modification composition are those obtained by aqueous solution polymerization using (meth) acrylic acid or a salt thereof as a main unit.
Examples of the water-absorbing resin having (meth) acrylic acid or a salt thereof as a main unit include polymers or copolymers of acrylic acid or methacrylic acid or salts thereof (alkali metal salts, ammonium salts, etc.), and polyacrylic acid And a salt thereof, and polymethacrylic acid and a salt thereof. As polyacrylic acid salt and polymethacrylic acid salt, sodium salt, potassium salt, ammonium salt and the like can be preferably used, but alkali metal salt, particularly sodium salt is preferable. In addition, acrylic acid or methacrylic acid, maleic acid, itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2-hydroxyethyl (meth) acrylate, styrenesulfonic acid, etc. A copolymer obtained by copolymerizing such a comonomer within a range that does not deteriorate the performance of the water-absorbent resin particles can also be preferably used as the water-absorbent resin particles mainly composed of acrylic acid or a salt thereof.
It is preferable that the water-absorbing resin having (meth) acrylic acid or a salt thereof as a main unit has a neutralization degree of (meth) acrylic acid of 50 to 80%. The water-absorbent resin particles may contain water.
水溶液重合は、アクリル酸（塩）を含む水溶性不飽和単量体の水溶液を架橋重合する方法である。
本発明の吸水性改質用組成物により改質処理された改質吸水性樹脂粒子は、吸収速度が向上しており、その一方で、吸収量を犠牲にすることもないか、殆どない。
吸水性樹脂粒子の主な合成方法としては、水溶液重合法と逆相懸濁重合法とがあるが、水溶液重合法で得られた吸水性樹脂粒子に対して、本発明の吸水性改質用組成物による改質処理を行うことが、吸収速度及び吸収量に優れた改質吸水性樹脂粒子を製造する観点から好ましい。
The aqueous solution polymerization is a method of crosslinking polymerization of an aqueous solution of a water-soluble unsaturated monomer containing acrylic acid (salt).
The modified water-absorbing resin particles modified by the water-absorbing modifying composition of the present invention have an improved absorption rate, while the amount of absorption is not sacrificed or hardly.
The main methods for synthesizing the water-absorbent resin particles include an aqueous solution polymerization method and a reversed-phase suspension polymerization method. For the water-absorbent resin particles obtained by the aqueous solution polymerization method, It is preferable to perform the modification treatment with the composition from the viewpoint of producing modified water-absorbing resin particles excellent in absorption rate and absorption amount.
水溶液重合に用いる開始剤は、過硫酸ナトリウム、t-ブチルハイドロパーオキサイド、過酸化水素などの水溶性ラジカル開始剤や光開始剤が好ましい。 The initiator used for the aqueous solution polymerization is preferably a water-soluble radical initiator or photoinitiator such as sodium persulfate, t-butyl hydroperoxide, or hydrogen peroxide.
本発明に係る吸水性改質吸水性樹脂粒子は、使い捨ておむつ、生理用ナプキン、失禁パッド、生理用ナプキン等の、身体から排出される排泄体液の吸収を目的とする吸収性物品の吸収体等に好ましく用いられる。また、それ以外の吸収性物品や更に他の用途に使用することもできる。 The water-absorbing modified water-absorbent resin particles according to the present invention are absorbent articles for absorbent articles, such as disposable diapers, sanitary napkins, incontinence pads, sanitary napkins, and the like for the purpose of absorbing excretory body fluids discharged from the body. Is preferably used. Moreover, it can also be used for other absorbent articles and further other uses.
吸収性物品の吸収体に用いる場合、改質吸水性樹脂粒子の吸収体内の配置場所や量は特に制限されず、従来の吸水性樹脂粒子と同様の態様で使用することができる。例えば、綿状パルプ繊維等の親水性繊維からなる繊維集合体中に、該繊維と混合した状態に配合することもできるし、そのような繊維集合体の片面や中央部等に偏在させることもできる。また、吸収シート間に層状に挟んだ状態に存在させることもできる。また、そのような構成のものを吸収性コアとし、それをティッシュペーパーや透水性の不織布等からなるコアラップシートで被覆した吸収体とすることもできる。 When used for the absorbent body of an absorbent article, the location and amount of the modified water absorbent resin particles in the absorbent body are not particularly limited and can be used in the same manner as conventional water absorbent resin particles. For example, in a fiber assembly made of hydrophilic fibers such as cotton-like pulp fibers, it can be blended in a state mixed with the fibers, or can be unevenly distributed on one side or the center of such a fiber assembly. it can. Moreover, it can also be made to exist in the state pinched | interposed into the layer form between the absorption sheets. Moreover, the thing of such a structure can also be set as an absorptive core, and it can also be set as the absorber covered with the core wrap sheet | seat which consists of tissue paper, a water-permeable nonwoven fabric, etc.
吸収性物品は、典型的には、表面シート、裏面シート及び両シート間に介在配置された液保持性の吸収体を具備している。表面シート及び裏面シートとしては、当該技術分野において通常用いられている材料を特に制限無く用いることができる。例えば表面シートとしては、親水化処理が施された各種不織布や開孔フィルム等の液透過性のシートを用いることができる。裏面シートとしては、熱可塑性樹脂のフィルムや、該フィルムと不織布とのラミネート等の液不透過性ないし撥水性のシートを用いることができる。裏面シートは水蒸気透過性を有していてもよい。吸収性物品は更に、該吸収性物品の具体的な用途に応じた各種部材を具備していてもよい。そのような部材は当業者に公知である。例えば吸収性物品を使い捨ておむつや生理用ナプキンに適用する場合には、表面シート上の左右両側部に一対又は二対以上の立体ガードを配置することができる。 The absorbent article typically includes a top sheet, a back sheet, and a liquid-retaining absorbent body disposed between both sheets. As the top sheet and the back sheet, materials usually used in the technical field can be used without particular limitation. For example, as the surface sheet, liquid permeable sheets such as various nonwoven fabrics and perforated films subjected to a hydrophilic treatment can be used. As the back sheet, a liquid-impermeable or water-repellent sheet such as a thermoplastic resin film or a laminate of the film and a nonwoven fabric can be used. The back sheet may have water vapor permeability. The absorbent article may further include various members according to specific uses of the absorbent article. Such members are known to those skilled in the art. For example, when applying an absorbent article to a disposable diaper or a sanitary napkin, a pair or two or more pairs of three-dimensional guards can be disposed on the left and right sides of the topsheet.
以上、本発明をその好ましい実施形態に基づき説明したが、本発明は前記実施形態に制限されない。 As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment.
以下、本発明を実施例及び比較例により更に具体的に説明するが、本発明はこれらに限定されるものではない。 EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further more concretely, this invention is not limited to these.
〔実施例１〜６，比較例１〜３〕
〔吸水性改質用組成物の調製〕
表１及び２に示す（ａ）成分及び（ｂ）成分を用いて吸水性改質用組成物（水溶液）を調製した。具体的には、（ｂ）成分をイオン交換水に入れて攪拌してイオン交換水に分散させ、（ａ）成分をイオン交換水に溶解させた水溶液を、前者の分散液に注入して混合し、濃度がそれぞれ５００ｐｐｍになるように調整した。
[Examples 1-6, Comparative Examples 1-3]
[Preparation of composition for water absorption modification]
Using the components (a) and (b) shown in Tables 1 and 2, water-absorbing modification compositions (aqueous solutions) were prepared. Specifically, the component (b) is placed in ion-exchanged water, stirred and dispersed in the ion-exchanged water, and an aqueous solution in which the component (a) is dissolved in the ion-exchanged water is injected into the former dispersion and mixed. The concentration was adjusted to 500 ppm each.
上記（ａ）成分として用いた化合物（界面活性剤）の種類を以下に示す。
〔（ａ）成分〕
ａ１：ポリオキシエチレンラウリルエーテル（花王株式会社製「エマルゲン108」、Ｒ1：炭素数１２の直鎖のラウリル基、ＥＯ平均付加モル数：６モル）
ａ２：ポリオキシエチレンラウリルエーテル（花王株式会社製「エマルゲン109P」、Ｒ1：炭素数１２の直鎖のラウリル基、ＥＯ平均付加モル数：９モル）
ａ３：ポリオキシエチレンラウリルエーテル（花王株式会社製「エマルゲン120」、Ｒ1：炭素数１２の直鎖のラウリル基、ＥＯ平均付加モル数：１２モル）
The types of the compounds (surfactants) used as the component (a) are shown below.
[(A) component]
a1: Polyoxyethylene lauryl ether (“Emulgen 108” manufactured by Kao Corporation, R 1 : linear lauryl group having 12 carbon atoms, EO average added mole number: 6 moles)
a2: Polyoxyethylene lauryl ether (“Emulgen 109P” manufactured by Kao Corporation, R 1 : linear lauryl group having 12 carbon atoms, EO average addition mole number: 9 moles)
a3: polyoxyethylene lauryl ether (“Emulgen 120” manufactured by Kao Corporation, R 1 : linear lauryl group having 12 carbon atoms, EO average addition mole number: 12 moles)
上記（ｂ）成分として用いた化合物（界面活性剤）の種類を以下に示す。
〔（ｂ）成分〕
ｂ１：ポリオキシプロピレン(3)オクチルエーテル（花王株式会社製商品名:「SOFCARE GP-1」、Ｒ2：炭素数８の直鎖のオクチル基、ＰＯ平均付加モル数：３モル）
ｂ２：ポリオキシプロピレン(3)ブチルエーテル（Ｒ2：炭素数４の直鎖のブチル基、ＰＯ平均付加モル数：３モル）
The types of the compounds (surfactants) used as the component (b) are shown below.
[Component (b)]
b1: Polyoxypropylene (3) octyl ether (trade name: “SOFCARE GP-1” manufactured by Kao Corporation, R 2 : straight-chain octyl group having 8 carbon atoms, PO average added mole number: 3 moles)
b2: Polyoxypropylene (3) butyl ether (R 2 : straight-chain butyl group having 4 carbon atoms, average PO addition mole number: 3 mol)
〔吸水性改質用組成物による処理〕
調製した吸水性改質用組成物を、実施例１〜５及び比較例２については、下記の吸水性樹脂粒子（１）に添加し、実施例６〜８については、下記の吸水性樹脂粒子（２）に添加した。吸水性樹脂粒子に対する前記（ａ）成分及び前記（ｂ）成分の合計添加量（ｗｔ％）を、表１及び表２中に示した。比較例１は、下記の吸水性樹脂粒子（１）をそのまま用い、比較例２には、下記の吸水性樹脂粒子（２）をそのまま用いた。
[Treatment with composition for water absorption modification]
The prepared water-absorbing modification composition was added to the following water-absorbent resin particles (1) for Examples 1 to 5 and Comparative Example 2, and the following water-absorbent resin particles were used for Examples 6 to 8. Added to (2). Tables 1 and 2 show the total addition amount (wt%) of the component (a) and the component (b) with respect to the water-absorbent resin particles. In Comparative Example 1, the following water absorbent resin particles (1) were used as they were, and in Comparative Example 2, the following water absorbent resin particles (2) were used as they were.
吸水性樹脂粒子（１）：株式会社日本触媒製の架橋ポリアクリル酸系樹脂粒子（アクアリックＣＡＷ）
吸水性樹脂粒子（２）：アクアリックＣＡＷの高保水タイプ
そして、吸水性改質用組成物を添加した吸水性樹脂粒子を、それぞれ、電気乾燥機にて、８０℃で約１６時間乾燥させ、改質吸水性樹脂粒子を得た。
Water-absorbing resin particles (1): Cross-linked polyacrylic acid resin particles (AQUALIC CAW) manufactured by Nippon Shokubai Co., Ltd.
Water-absorbing resin particles (2): Aquaric CAW high water retention type And each of the water-absorbing resin particles to which the water-absorbing modification composition was added was dried at 80 ° C. for about 16 hours with an electric dryer, Modified water absorbent resin particles were obtained.
〔評価〕
実施例１〜８及び比較例１〜３の吸水性樹脂粒子について、(１)保水量（吸収量）、（２）加圧下吸収量、（３）Ｖｏｒｔｅｘ吸水時間、及び（４）加圧下通液速度を、それぞれ以下に示す方法により測定した。その結果を表１，２に示した。
[Evaluation]
For the water-absorbent resin particles of Examples 1 to 8 and Comparative Examples 1 to 3, (1) water retention amount (absorption amount), (2) absorption amount under pressure, (3) Vortex water absorption time, and (4) passage under pressure The liquid speed was measured by the following methods. The results are shown in Tables 1 and 2.
表１、２の結果から分かるように本発明の吸水性改質用組成物により改質した改質吸水性樹脂粒子は、保水量、加圧下吸収量を維持したままＶｏｒｔｅｘ吸水時間、加圧下通液速度を向上させることができた。また、意外なことに、親水性の高い(a)成分単独よりも疎水性の高い(ｂ)成分を混ぜることで効果が大きいことが判る。 As can be seen from the results in Tables 1 and 2, the modified water-absorbent resin particles modified with the water-absorbing property modifying composition of the present invention have a Vortex water absorption time and a reduced pressure passage while maintaining the water retention amount and the absorption amount under pressure. The liquid speed could be improved. Surprisingly, it can be seen that mixing the component (b) having higher hydrophobicity than the component (a) having high hydrophilicity alone is effective.
(１)保水量（吸収量）
ナイロン製の織布（メッシュ開き２５０メッシュ）を、幅１０ｃｍ、長さ３０ｃｍの長方形状に切り取り、長手方向中央で二つ折りにし、両端をヒートシールして、幅１０ｃｍ（内寸８．５ｃｍ）、長さ１５ｃｍのナイロン袋を作製する。試料１．０ｇを精秤した後、作製したナイロン袋の底部に均一になるように入れる。試料の入ったナイロン袋を３００ｍＬ容のビーカーに入れ、攪拌しながら生理食塩水２００ｍＬを加え、３０分間放置する。３０分後、ナイロン袋を遠心脱水器内で脱水する。脱水条件は、１４３Ｇ（８００ｒｐｍ）で１０分間とする。脱水後、サンプルの質量を測定し、下記式に従い、保水量（吸収量）を算出する。
保水量（ｇ／ｇ）＝（ａ−ｂ−ｃ）／１.0
（式中、ａは遠心脱水後の試料及びナイロン袋の総質量（ｇ）、ｂはナイロン袋の質量（ｇ）、ｃは試料の質量（ｇ）を表す。）
(1) Water retention (absorption)
Nylon woven cloth (mesh opening 250 mesh) is cut into a rectangular shape with a width of 10 cm and a length of 30 cm, folded in half at the center in the longitudinal direction, and both ends are heat-sealed, and a width of 10 cm (inner size 8.5 cm), A 15 cm long nylon bag is made. After 1.0 g of the sample is precisely weighed, it is uniformly placed in the bottom of the produced nylon bag. The nylon bag containing the sample is put into a 300 mL beaker, and 200 mL of physiological saline is added with stirring, and left for 30 minutes. After 30 minutes, the nylon bag is dehydrated in a centrifugal dehydrator. The dehydration condition is 143 G (800 rpm) for 10 minutes. After dehydration, the mass of the sample is measured, and the water retention amount (absorption amount) is calculated according to the following formula.
Water retention amount (g / g) = (a−b−c) /1.0
(In the formula, a represents the total mass (g) of the sample and the nylon bag after centrifugal dehydration, b represents the mass (g) of the nylon bag, and c represents the mass (g) of the sample.)
（２）加圧下吸収量
加圧下保水量は、目開き６３μｍのナイロン網を底面に貼った円筒管（内径３０ｍｍ、高さ６０ｍｍ）内に、試料（吸水性樹脂粒子）０．５０ｇを秤量して入れ、円筒管を垂直にしてナイロン網上に試料がほぼ均一の厚さになるように整え、２．０ｋＰａの加圧が試料にかかるように外径２９．５ｍｍ×高さ２７ｍｍの分銅を円筒管に挿入する。円筒管と分銅の質量はあらかじめ測定しておく。
次いで、生理食塩水５０ｍｌの入ったシャーレ（直径：９４ｍｍ）の中に試料及び分銅の入った円筒管をナイロン網側を下面にして垂直に浸す。この時、シャーレの底面ぎりぎりの深さまで、円筒管が浸漬するようにする。
６０分後に試料及び分銅の入った円筒管を水中から引き上げて質量を計量し、あらかじめ測定しておいた円筒管と分銅の質量を差し引き、試料が吸収した生理食塩水の質量を算出する。この吸収した生理食塩水の質量を２倍した値を加圧下吸収量（ｇ／ｇ）とする。
(2) Absorption under pressure Water retention under pressure is obtained by weighing 0.50 g of sample (water-absorbent resin particles) in a cylindrical tube (inner diameter: 30 mm, height: 60 mm) with a nylon mesh with a mesh opening of 63 μm attached to the bottom. Put a cylindrical tube vertically and arrange the sample on the nylon net so that the sample has a substantially uniform thickness, and apply a weight of 29.5 mm outer diameter × 27 mm height so that 2.0 kPa pressure is applied to the sample. Insert into a cylindrical tube. The mass of the cylindrical tube and the weight is measured in advance.
Next, a cylindrical tube containing a sample and a weight in a petri dish (diameter: 94 mm) containing 50 ml of physiological saline is immersed vertically with the nylon mesh side as the bottom surface. At this time, the cylindrical tube is immersed to the depth of the bottom of the petri dish.
After 60 minutes, the cylindrical tube containing the sample and the weight is pulled up from the water, and the mass is measured. The mass of the cylindrical tube and the weight that have been measured in advance is subtracted, and the mass of the physiological saline absorbed by the sample is calculated. A value obtained by doubling the mass of the absorbed physiological saline is defined as an absorbed amount under pressure (g / g).
（３）Ｖｏｒｔｅｘ吸水時間
１００ｍＬビーカーに、生理食塩水５０ｇ及びマグネチックスターラーチップを入れ、マグネチックスターラーの回転数を６００±５ｒｐｍに調整して攪拌させる。試料２．０ｇを、攪拌中の生理食塩水の渦の中心部で液中に投入し、液表面が平らになるまでの時間（秒）を測定した。なお、この方法では、Ｖｏｒｔｅｘ法による吸水速度の評価を、時間を測定することで評価しているため、測定時間が短い程、吸水速度が速いとみなされる。
(3) Vortex water absorption time In a 100 mL beaker, 50 g of physiological saline and a magnetic stirrer chip are put, and the rotational speed of the magnetic stirrer is adjusted to 600 ± 5 rpm and stirred. 2.0 g of the sample was put into the liquid at the center of the vortex of the physiological saline being stirred, and the time (seconds) until the liquid surface became flat was measured. In this method, since the evaluation of the water absorption rate by the Vortex method is evaluated by measuring the time, the shorter the measurement time, the higher the water absorption rate.
（４）加圧下通液速度
垂直に立てた円筒（内径２５．４ｍｍ）の開口部の下端に、フィルター（目開き１５０μｍ、３０ＳＵＳ、直径３０ｍｍ、厚み３ｍｍ）と、コック（内径２ｍｍ）付き細管（内径４ｍｍ、長さ８５ｍｍ）とが備えられた濾過円筒管を用意する。
あらかじめ試料０．３２ｇを２００ｍＬ容ビーカーに入れ、更に生理食塩水１５０を加え、３０分間放置し、該試料を膨潤させておく。
次に、コックを閉め、前記の円筒管内に、膨潤した試料を含む上記ビーカーの内容物全てを投入する。次いで、目開きが１５０μｍで直径が２５ｍｍである金網を先端に備えた直径２５ｍｍの円柱棒を濾過円筒管内に挿入し、該金網と測定試料とが接するようにする。次に、前記の円柱棒におもりを取り付けて、測定試料に２．０ｋＰａの荷重を加える。この状態で１分間静置した後コックを開いて液を流す。濾過円筒管内の生理食塩水の液面が、４０ｍＬの目盛り線から２０ｍＬの目盛り線に達する迄（２０ｍＬの液が通過する迄）の時間（Ｔ1）（秒）を計測する。計測された時間Ｔ1（秒）を用い、次式から加圧下通液速度を算出する。尚、式中、Ｔ0（秒）は、濾過円筒管内に測定試料を入れない以外は、同様にして、生理食塩水２０ｍｌが金網を通過するのに要する時間を計測した値である。
加圧下通液速度（ｍｌ／ｍｉｎ）＝２０×６０／（Ｔ1−Ｔ0）
(4) Fluid flow rate under pressure A filter (mesh size: 150 μm, 30 SUS, diameter: 30 mm, thickness: 3 mm) and a small tube with a cock (inner diameter: 2 mm) are provided at the lower end of a vertically standing cylinder (inner diameter: 25.4 mm). A filtration cylindrical tube having an inner diameter of 4 mm and a length of 85 mm is prepared.
In advance, 0.32 g of a sample is put in a 200 mL beaker, and physiological saline 150 is further added and left for 30 minutes to swell the sample.
Next, the cock is closed and all the contents of the beaker including the swollen sample are put into the cylindrical tube. Next, a cylindrical rod having a diameter of 25 mm and having a wire mesh having an opening of 150 μm and a diameter of 25 mm is inserted into the filtration cylindrical tube so that the wire mesh and the measurement sample are in contact with each other. Next, a weight is attached to the cylindrical rod, and a load of 2.0 kPa is applied to the measurement sample. After standing in this state for 1 minute, the cock is opened and the liquid is poured. The time (T 1 ) (seconds) until the liquid level of the physiological saline in the filtration cylindrical tube reaches the 20 mL scale line from the 40 mL scale line (until 20 mL of liquid passes) is measured. Using the measured time T 1 (seconds), the liquid flow rate under pressure is calculated from the following equation. In the formula, T 0 (seconds) is a value obtained by measuring the time required for 20 ml of physiological saline to pass through the wire mesh, except that the measurement sample is not placed in the filtration cylindrical tube.
Flow rate under pressure (ml / min) = 20 × 60 / (T 1 −T 0 )
表１及び表２に示す通り、本発明の実施例１〜８は、保水量（吸収量）及び加圧下吸収量については、比較例１，３と同程度の性能が維持されている一方、Ｖｏｒｔｅｘ吸水時間が比較例１〜３に比して短くなっており、吸収速度が向上していることが判る。また、本発明の実施例１〜８は、加圧下通液速度についても、比較例１〜３に比して増大しており、加圧下における通液速度も速くなっていることが判る。
なお、２．０ｋＰａの加圧状態は、おむつ等の吸収性物品の着用時に該吸収性物品に厚み方向に加わる圧力を想定している。
As shown in Tables 1 and 2, Examples 1 to 8 of the present invention maintained the same performance as Comparative Examples 1 and 3 for the water retention amount (absorption amount) and the absorption amount under pressure, It can be seen that the Vortex water absorption time is shorter than Comparative Examples 1 to 3, and the absorption rate is improved. Moreover, Examples 1-8 of this invention are also increasing compared with Comparative Examples 1-3 also about the liquid flow rate under pressure, and it turns out that the liquid flow rate under pressure is also high.
The pressurized state of 2.0 kPa assumes a pressure applied to the absorbent article in the thickness direction when the absorbent article such as a diaper is worn.
〔吸収性物品の評価〕
実施例２の改質吸水性樹脂粒子と比較例１の吸水性樹脂粒子とを用いて、吸収体を作成し、該吸収体を組み込んだ失禁パッドを試作した。
〔吸収体の作製方法〕
吸収体は、解繊したパルプ繊維集合体（坪量５０ｇ/ｍ2のパルプシート）上に、吸水性樹脂粒子を散布（散布坪量７５ｇ/ｍ2）し、次いで、パルプシートを積層させ、その上に吸収性樹脂粒子を散布(７５ｇ/ｍ2)し、さらにパルプシートを積層しトータルパルプ坪量１５０ｇ/ｍ2、吸収性樹脂粒子１５０ｇ/ｍ2の積層体とした。そして積層体を、坪量３０ｇ/ｍ2のティッシュペーパーで被覆した。
〔吸収性物品の作製方法〕
樹脂フィルムからなる裏面シート上に作製した吸収体を配し、その吸収体上に、坪量２５ｇ/ｍ2のエアスルー不織布からなるクッション材（構成繊維：芯：ＰＥＴ、鞘：ＰＥの２．４ｄｔｅｘの芯鞘型複合繊維）及び該クッション材と同材の表面シートをこの順に重ねて、裏面シート、クッション材及び表面シートを、吸収体の周囲において固定した。
[Evaluation of absorbent articles]
Using the modified water-absorbent resin particles of Example 2 and the water-absorbent resin particles of Comparative Example 1, an absorbent body was prepared, and an incontinence pad incorporating the absorbent body was prototyped.
[Production method of absorber]
Absorber on defibrated pulp fiber aggregate (pulp sheet having a basis weight of 50 g / m 2), a water-absorbent resin particles sprayed (sprinkled basis weight 75 g / m 2), then, by laminating the pulp sheet, Absorbent resin particles were sprayed (75 g / m 2 ) thereon, and a pulp sheet was further laminated to obtain a laminate having a total pulp basis weight of 150 g / m 2 and absorbent resin particles 150 g / m 2 . The laminate was covered with a tissue paper having a basis weight of 30 g / m 2 .
[Method for producing absorbent article]
An absorber prepared on a back sheet made of a resin film is arranged, and a cushion material made of an air-through nonwoven fabric having a basis weight of 25 g / m 2 is formed on the absorber (2.4 dtex of constituent fiber: core: PET, sheath: PE). The core-sheath type composite fiber) and the top sheet of the same material as the cushion material were stacked in this order, and the back sheet, the cushion material, and the top sheet were fixed around the absorber.
実施例２の改質吸水性樹脂粒子を用いた失禁パッド（以下、実施例の失禁パッドという）及び比較例１の吸水性樹脂粒子を用いた失禁パッド（以下、比較例の失禁パッドという）について、下記方法により液残り量（ｍｇ）を測定した。その結果を表３に示す。 About the incontinence pad using the modified water-absorbent resin particles of Example 2 (hereinafter referred to as the incontinence pad of the example) and the incontinence pad using the water-absorbent resin particles of Comparative Example 1 (hereinafter referred to as the incontinence pad of the comparative example) The remaining liquid amount (mg) was measured by the following method. The results are shown in Table 3.
〔液残り量の測定〕
失禁パッドを水平に置き、表面シート側の面における吸収体配置領域の中央部に、人工尿（５０ｇを、５ｇ／秒の速度で）注入した。注入後１０秒後に、市販のティッシュペーパー（商品名：クリネックス（日本製紙クレシア））２枚を縦１１５ｍｍ×横４５ｍｍになるように縦、横に３回折ったものを載せた。更にその上に圧力が０．４ｋＰａになるように重りを載せて５秒間加圧した。加圧後、吸収紙を取り出し、加圧前後の紙の重さを測定して、紙に吸収された液の重量を測定して表面液残り量（人工尿）とした。
また、人工尿に代えて生理用食塩水５０ｇを注入する以外は、同様にして、表面液残り量（生理食塩水）を測定した。
[Measurement of remaining liquid amount]
An incontinence pad was placed horizontally, and artificial urine (50 g was injected at a rate of 5 g / sec) was injected into the center of the absorber arrangement region on the surface on the surface sheet side. Ten seconds after the injection, two commercially available tissue papers (trade name: Kleenex (Nippon Paper Crecia)), which were diffracted three times vertically and horizontally so as to be 115 mm long and 45 mm wide, were placed. Further, a weight was placed thereon so that the pressure became 0.4 kPa and pressurized for 5 seconds. After pressurization, the absorbent paper was taken out, the weight of the paper before and after pressurization was measured, and the weight of the liquid absorbed by the paper was measured to obtain the remaining amount of surface liquid (artificial urine).
Further, the remaining amount of the surface liquid (physiological saline) was measured in the same manner except that 50 g of physiological saline was injected instead of artificial urine.
表３に示す結果から判るように、本発明の吸水性改質用組成物により改質した改質吸水性樹脂粒子を、吸収体又は吸収性物品に用いることにより、吸収体又は吸収性物品の液残り量の少なさ等の、吸収性能を向上させ得ることが判る。 As can be seen from the results shown in Table 3, by using the modified water absorbent resin particles modified with the water absorbent modification composition of the present invention for the absorbent or absorbent article, the absorbent or absorbent article. It can be seen that the absorption performance such as a small amount of liquid remaining can be improved.
Claims (8)
Ｒ１Ｏ−（ＥＯ）ｋ−Ｈ ・・・（１）
〔式中、Ｒ１は炭素数８〜１８のアルキル基、ＥＯはオキシエチレン基、ｋは４〜１２の数を示す。〕
で表される化合物、及び
（ｂ）下記一般式（２）
Ｒ２Ｏ−（ＰＯ）ｐ−Ｈ ・・・（２）
〔式中、Ｒ２は炭素数４〜１２のアルキル基、ＰＯはオキシプロピレン基、ｐは１〜７の数を示す。〕
で表される化合物を含む、吸水性樹脂粒子の吸水性改質用組成物。 (A) The following general formula (1)
R 1 O— (EO) k —H (1)
[Wherein, R 1 represents an alkyl group having 8 to 18 carbon atoms, EO represents an oxyethylene group, and k represents a number of 4 to 12]. ]
And (b) the following general formula (2)
R 2 O— (PO) p—H (2)
[Wherein R 2 represents an alkyl group having 4 to 12 carbon atoms, PO represents an oxypropylene group, and p represents a number of 1 to 7. ]
The composition for water-absorbing property modification of the water-absorbing resin particle containing the compound represented by these.
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