JPH02233139A - Cold water-soluble water absorbing material - Google Patents
Cold water-soluble water absorbing materialInfo
- Publication number
- JPH02233139A JPH02233139A JP1054167A JP5416789A JPH02233139A JP H02233139 A JPH02233139 A JP H02233139A JP 1054167 A JP1054167 A JP 1054167A JP 5416789 A JP5416789 A JP 5416789A JP H02233139 A JPH02233139 A JP H02233139A
- Authority
- JP
- Japan
- Prior art keywords
- water
- solution
- freeze
- absorbing material
- cellulose
- 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.)
- Pending
Links
- 239000011358 absorbing material Substances 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 33
- 229920000609 methyl cellulose Polymers 0.000 claims abstract description 13
- 239000001923 methylcellulose Substances 0.000 claims abstract description 13
- 238000004108 freeze drying Methods 0.000 claims abstract description 9
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 claims abstract description 9
- 238000006467 substitution reaction Methods 0.000 claims abstract description 9
- 235000010981 methylcellulose Nutrition 0.000 abstract description 12
- WVDDGKGOMKODPV-UHFFFAOYSA-N Benzyl alcohol Chemical compound OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 abstract description 6
- 239000003513 alkali Substances 0.000 abstract description 6
- 229920002678 cellulose Polymers 0.000 abstract description 6
- 239000001913 cellulose Substances 0.000 abstract description 6
- 239000002904 solvent Substances 0.000 abstract description 6
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical compound ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 abstract description 4
- 235000019445 benzyl alcohol Nutrition 0.000 abstract description 2
- 239000008280 blood Substances 0.000 abstract description 2
- 210000004369 blood Anatomy 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 229940050176 methyl chloride Drugs 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 230000029142 excretion Effects 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 239000002250 absorbent Substances 0.000 description 7
- 230000002745 absorbent Effects 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000036760 body temperature Effects 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 229920003086 cellulose ether Polymers 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- INQOMBQAUSQDDS-UHFFFAOYSA-N iodomethane Chemical compound IC INQOMBQAUSQDDS-UHFFFAOYSA-N 0.000 description 1
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Absorbent Articles And Supports Therefor (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は冷水溶解性吸水材、とくには下水等の排水に流
して廃棄することの出来る、医療、生理、および紙おむ
つ用品等として有用な冷水溶解性吸水材に関するもので
ある。Detailed Description of the Invention (Field of Industrial Application) The present invention is a cold water soluble water absorbent material, particularly a cold water absorbent material useful for medical, physiological, disposable diaper products, etc. that can be disposed of by disposing of it in drainage such as sewage. It relates to soluble water-absorbing materials.
（従来の技術）
近年開発された吸水性ボリマーは高分子間に架橋結合を
局在化させ電解質分子を高分子鎖に結合させたもので，
自重の数百倍もの水を吸収保持するため，とくに生理用
品、紙おむつ用品として広く普及してきている．
しかし、この吸水性ポリマーは水溶性でないことから、
材料の大部分が吸水性ボリマーで占められている生理用
品や紙おむつも、下水等に流して処理することができず
、一般のゴミと共に焼却するしかなかった。(Prior technology) Water-absorbing polymers developed in recent years are made by localizing crosslinks between polymer molecules and bonding electrolyte molecules to polymer chains.
Because it absorbs and retains several hundred times its own weight in water, it has become widely used, especially in sanitary products and disposable diapers. However, since this water-absorbing polymer is not water-soluble,
Sanitary products and disposable diapers, which are mostly made of water-absorbing polymers, cannot be disposed of by flushing them down the drain, so they have no choice but to be incinerated along with general garbage.
（発明が解決しようとする課題）
このような事情から、生理用品や紙おむつなど身に付け
ている間に生ずる汚物を吸収することができて、しかも
これを下水等に流したときには容易に溶解する特性を持
つ素材の出現が望まれていた。(Problem to be solved by the invention) Under these circumstances, it is possible to absorb the filth generated while wearing sanitary napkins and disposable diapers, and it also dissolves easily when flushed into the sewer etc. It was hoped that a material with special properties would emerge.
この分野に関連する技術として，本出願人は先に特開昭
５５−７１５３２号および特公昭６１−２９３７５号公
報により、水溶性のポリビニルアルコールおよびセルロ
ースエーテル水溶液等を凍結乾燥して得られるスポンジ
状成形体を水吸収体として用いる技術を提案した。しか
し、ここに記載されているような，通常市版されている
ポリビニルアルコールや、セルロースエーテルで水に可
溶のものを用いると、凍結乾燥体自体が水に溶けるため
、スポンジ状成形体の空孔に水が補給されると同時に、
スポンジの骨格を形成するボリマーも溶けてしまって、
スポンジの形態を保つことができなくなり、吸収材とし
て役立つ時間が極めて短いという問題があった．
（課題を解決するための手段）
本発明者らは，これらの事実に鑑み，鋭意検討の結果，
メトキシ置換度が３０％以上、好ましくは３０〜４４％
であるメチルセルロースの溶液を凍結乾燥して得られる
海綿状をした吸水材では，人の体温に近い３５℃付近で
は水，血液、または廃せつ物に溶解されることなく、こ
れらの物質を吸収保持することができ、これらの物質を
吸収したまま、冷水、好ましくは２５℃以下の水に浸漬
すると，このメチルセルロースの凍結乾燥物が溶解する
ことを見出し、本発明を完成した．
すなわち、本発明による冷水溶解性吸水材はメトキシ置
換度が３０％以上のメチルセルロースの溶液を凍結乾燥
してなるものとしたことを要旨とするものであり、これ
は冷水には溶解するが体温付近の温度では水に溶解しな
い特性を有する吸水材としたことにより、下水等の排水
に流して処理することを可能にしたものである。As a technique related to this field, the present applicant has previously disclosed in Japanese Patent Application Laid-Open No. 55-71532 and Japanese Patent Publication No. 61-29375 a sponge-like material obtained by freeze-drying water-soluble polyvinyl alcohol and cellulose ether aqueous solutions. We proposed a technology that uses molded bodies as water absorbers. However, if water-soluble polyvinyl alcohol or cellulose ether, which is normally commercially available, is used as described here, the lyophilized product itself will dissolve in water, so the voids in the sponge-like molded product will be reduced. At the same time water is replenished into the hole,
The polymer that forms the skeleton of the sponge has also melted,
The problem was that it could no longer maintain its sponge shape, and the time it served as an absorbent material was extremely short. (Means for Solving the Problems) In view of these facts, the inventors of the present invention have made the following as a result of intensive study.
Methoxy substitution degree is 30% or more, preferably 30-44%
A spongy water-absorbing material obtained by freeze-drying a solution of methylcellulose, which is a methyl cellulose, absorbs and retains water, blood, or waste without being dissolved at temperatures around 35°C, which is close to the human body temperature. The inventors have discovered that this lyophilized methylcellulose dissolves when it is immersed in cold water, preferably water at 25°C or lower, while absorbing these substances, and has completed the present invention. That is, the cold water-soluble water-absorbent material according to the present invention is made by freeze-drying a solution of methyl cellulose with a degree of methoxy substitution of 30% or more, and although it is soluble in cold water, it dissolves at temperatures close to body temperature. By using a water-absorbing material that does not dissolve in water at a temperature of 100 mL, it is possible to dispose of it in wastewater such as sewage for treatment.
これをさらに詳細に説明すると，本発明で使用するメチ
ルセルロースは、粉状もしくはシート状のパルプと呼ば
れるセルロース物質を，アルカリに浸漬してアルカリセ
ルロースとし、これにメチルクロライド、よう化メチル
等のメチルエーテル化剤を加えてオートクレープ中で反
応させた後、熱水中で乾燥し粉砕したもので、メトキシ
置換度が３０％以上、好ましくは３０〜４４％であるも
のを使用する。ここでメトキシ置換度が３０％未満のも
のは凍結乾燥されたメチルセルロースが体温付近の３５
℃で溶解してしまい，本発明の目的が達成されない。ま
たメトキシ置換度が４４％を超えるものでは凍結乾燥物
の冷水への溶解性が悪くなる。 このメチルセルロース
の分子量はあまり低分子量であると３５℃付近の温度で
も凍結乾燥物が溶けやすくなるので重量平均分子量で１
０，０００以上が好ましい．
また、凍結乾燥の方法としては上記メチルセルロースを
水またはベンジルアルコール、塩化メチレン／メタノー
ル、ジメチルホルムアミド等の溶剤に溶かした後，所定
の大きさのパレット容器等に展開，キャスティングし、
ついで通常の凍結融解装置により凍結乾燥する。To explain this in more detail, the methylcellulose used in the present invention is obtained by soaking powdered or sheet-like cellulose material called pulp in alkali to obtain alkali cellulose, and adding methyl ether such as methyl chloride or methyl iodide to the alkali cellulose. After adding a curing agent and reacting in an autoclave, it is dried in hot water and pulverized, and the degree of methoxy substitution is 30% or more, preferably 30 to 44%. Here, if the degree of methoxy substitution is less than 30%, freeze-dried methylcellulose is at 35% near body temperature.
℃, and the object of the present invention cannot be achieved. Moreover, if the degree of methoxy substitution exceeds 44%, the solubility of the freeze-dried product in cold water will be poor. If the molecular weight of this methylcellulose is too low, the lyophilized product will easily melt even at temperatures around 35°C, so the weight average molecular weight is 1.
0,000 or more is preferable. In addition, the freeze-drying method involves dissolving the above-mentioned methylcellulose in water or a solvent such as benzyl alcohol, methylene chloride/methanol, dimethylformamide, etc., and then spreading and casting it into a pallet container of a predetermined size.
It is then freeze-dried using a conventional freeze-thaw apparatus.
凍結乾燥時の溶液の濃度は０．１〜２０％程度が好まし
い。これを０．１％未満で凍結乾燥すると、乾燥体の密
度が低くなり、水等の吸収性はよくなるものの、保形性
および吸水保持性が損なわれる．２０％を超えると溶液
粘度が高く適当な成形用パレットへの展開が困難になる
だけでなく、凍結乾燥体の密度が高くなり吸水性が悪く
なる。The concentration of the solution during freeze-drying is preferably about 0.1 to 20%. If this is freeze-dried at a concentration of less than 0.1%, the density of the dried product will be low, and although the absorbency of water and the like will be improved, the shape retention and water absorption and retention properties will be impaired. If it exceeds 20%, not only will the viscosity of the solution be high and it will be difficult to spread it into a suitable molding pallet, but also the density of the freeze-dried product will be high and its water absorption will be poor.
凍結乾燥の条件としては、成形溶液が凍結乾燥するよう
に溶媒の凝固温度以下で溶液を凍結させた後、真空下に
て溶媒を蒸発させる方法が採用される．例えば，水を溶
媒とした溶液を凍結乾燥するには、凍結乾燥機で−４０
℃で３時間放置して溶液を凍結した後、０．３トールで
１２時間凍結乾燥する方法が用いられる．
これらの方法で得られた所望の形状の凍結乾燥体を生理
用品または紙おむつ用品とする場合には、シート状にし
て凍結乾燥したものを所望の大きさに裁断して使用すれ
ばよい。The conditions for freeze-drying are to freeze the solution below the coagulation temperature of the solvent so that the molding solution is freeze-dried, and then evaporate the solvent under vacuum. For example, to freeze-dry a solution using water as a solvent, use a freeze dryer to
The method used is to freeze the solution by leaving it at ℃ for 3 hours and then freeze-drying it at 0.3 Torr for 12 hours. When the freeze-dried product in a desired shape obtained by these methods is to be used as a sanitary product or a disposable diaper product, the product may be freeze-dried into a sheet and then cut into a desired size for use.
（実施例）
以下、本発明の具体的態様を実施例および比較例により
説明するが、本発明はこの実施例に限定されるものでは
ない。(Examples) Hereinafter, specific aspects of the present invention will be explained using Examples and Comparative Examples, but the present invention is not limited to these Examples.
実施例１〜４および比較例１〜２
別表に示すメトキシ置換度と重量平均分子量のメチルセ
ルロースを用いて、表に示す濃度の水溶液を調製し、深
さ２■、大きさ４ ｃｍ Ｘ ３ ｔｘのトレーと、深
さ８ｍａ＋、大きさ８０ａａ四方のトレーの中に溶液を
展開し、凍結乾燥機で−４０℃で３時間放置して溶液を
凍結した後、０．３トールで１２時間凍結乾燥して凍結
乾燥体（吸水材）を得た。Examples 1 to 4 and Comparative Examples 1 to 2 Using methylcellulose with the degree of methoxy substitution and weight average molecular weight shown in the attached table, an aqueous solution with the concentration shown in the table was prepared, The solution was developed in a tray with a depth of 8 ma+ and a size of 80 aa square, and the solution was frozen by leaving it in a freeze dryer at -40°C for 3 hours, and then freeze-dried at 0.3 Torr for 12 hours. A freeze-dried product (water-absorbing material) was obtained.
得られた各吸水材の２ ｃｍ Ｘ ４ ｃＭＸ ３ ｃ
ｍの大きさのものを３５℃の水中に漬け，溶解状況を観
察した。2 cm x 4 cMX 3 c of each water absorbing material obtained
A sample of size m was immersed in water at 35°C and the state of dissolution was observed.
また、この吸水材を２５℃の水中に漬け、同様に溶解状
況を＊察した．３５℃の水から吸水材を取り出した後、
減少した溶液の量から各吸水材の吸水率を算出した。In addition, this water-absorbing material was immersed in water at 25°C, and the state of dissolution was observed in the same manner. After removing the water absorbing material from 35℃ water,
The water absorption rate of each water absorbing material was calculated from the reduced amount of solution.
さらに、実施例１〜４で得られた８ｍｍＸ８０Ｇ×８０
Ｃ！ｍの大きさの真空乾燥体を裁断して乳児用おむつを
調製し、乳児に着用させ、廃せつ物を吸収させた後、水
洗トイレに流したところ、おむつがトイレに詰まること
なく溶解して流れた。Furthermore, 8 mm x 80 G x 80 obtained in Examples 1 to 4
C! After cutting the vacuum-dried material of the size of m to prepare infant diapers and putting them on the infant to absorb the waste, the diaper was flushed into the flush toilet, and the diaper dissolved without clogging the toilet. flowed.
実施例５
実施例１において溶媒にベンジルアルコールを用いたほ
かは同様にして吸収剤を作成し、同様の評価を行ったと
ころ、実施例１と同様の結果が得られた。Example 5 An absorbent was prepared in the same manner as in Example 1 except that benzyl alcohol was used as the solvent, and the same evaluation was performed, and the same results as in Example 1 were obtained.
（発明の効果）
本発明の冷水溶解性吸水材によれば、生理用品や紙おむ
つにおける吸収材料として広く利用することができる。(Effects of the Invention) The cold water-soluble water absorbent material of the present invention can be widely used as an absorbent material in sanitary products and disposable diapers.
Claims (1)
の溶液を凍結乾燥してなる冷水溶解性吸水材。1. A cold water-soluble water-absorbing material made by freeze-drying a solution of methylcellulose with a degree of methoxy substitution of 30% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1054167A JPH02233139A (en) | 1989-03-07 | 1989-03-07 | Cold water-soluble water absorbing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1054167A JPH02233139A (en) | 1989-03-07 | 1989-03-07 | Cold water-soluble water absorbing material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02233139A true JPH02233139A (en) | 1990-09-14 |
Family
ID=12962989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1054167A Pending JPH02233139A (en) | 1989-03-07 | 1989-03-07 | Cold water-soluble water absorbing material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02233139A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5843575A (en) * | 1994-02-17 | 1998-12-01 | The Procter & Gamble Company | Absorbent members comprising absorbent material having improved absorbent property |
| US5849405A (en) * | 1994-08-31 | 1998-12-15 | The Procter & Gamble Company | Absorbent materials having improved absorbent property and methods for making the same |
-
1989
- 1989-03-07 JP JP1054167A patent/JPH02233139A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5843575A (en) * | 1994-02-17 | 1998-12-01 | The Procter & Gamble Company | Absorbent members comprising absorbent material having improved absorbent property |
| US5858535A (en) * | 1994-02-17 | 1999-01-12 | The Procter & Gamble Company | Absorbent articles comprising absorbent members comprising absorbent materials having improved absorbent property |
| US6099950A (en) * | 1994-02-17 | 2000-08-08 | The Procter & Gamble Company | Absorbent materials having improved absorbent property and methods for making the same |
| US5849405A (en) * | 1994-08-31 | 1998-12-15 | The Procter & Gamble Company | Absorbent materials having improved absorbent property and methods for making the same |
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