JP2679107B2 - Liquid super absorbent resin manufacturing method - Google Patents
Liquid super absorbent resin manufacturing methodInfo
- Publication number
- JP2679107B2 JP2679107B2 JP63114472A JP11447288A JP2679107B2 JP 2679107 B2 JP2679107 B2 JP 2679107B2 JP 63114472 A JP63114472 A JP 63114472A JP 11447288 A JP11447288 A JP 11447288A JP 2679107 B2 JP2679107 B2 JP 2679107B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- temperature
- oxidizing agent
- gel
- absorbing
- 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.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/06—Oxidation
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は液状高吸水性樹脂の製造法に関する。ここで
液状高吸水性樹脂とは、親水性の高分子電解質もしくは
親水性の非イオン性高分子の水溶液であって、単独で又
は多官能性化合物を添加して熱処理することによりゲル
化し、自重の10〜1000倍の水を吸収する能力を有する吸
水ゲルになるものをいう。The present invention relates to a method for producing a liquid superabsorbent resin. Here, the liquid superabsorbent resin is an aqueous solution of a hydrophilic polyelectrolyte or a hydrophilic nonionic polymer, which is gelled by heat treatment alone or by adding a polyfunctional compound and self-weighting. Of 10 to 1000 times as much water as the water-absorbing gel.
〈従来の技術〉 液状高吸水性樹脂は、単独あるいは紙、布、樹脂等さ
まざまの基材に含浸もしくはコーティングした後熱処理
して用いられ、その用途としては合成綿の吸汗性改良、
布おむつの尿吸収性改良、菌培地、薬剤徐放用基材、疎
水性樹脂への浸水性付与等が挙げられる。固体の高吸水
性樹脂を用いた場合問題となる樹脂の脱落がほとんどな
く、また任意の形状に容易に加工しやすい等の特徴があ
り、広くその利用が検討されている。<Prior Art> Liquid superabsorbent resin is used alone or after being impregnated or coated on various substrates such as paper, cloth and resin, and then heat-treated, and its use is to improve sweat absorption of synthetic cotton.
Examples include improving the urine absorbability of a cloth diaper, a bacterial culture medium, a substrate for sustained drug release, and imparting water infiltration to a hydrophobic resin. The use of a solid highly water-absorbent resin has the characteristics that the problem of resin does not almost fall off and that it can be easily processed into an arbitrary shape, and its use has been widely studied.
従来、液状高吸水性樹脂は固体の吸水ゲルを液状化す
ることにより製造される。この固体の吸水ゲルの液状化
方法としては、固体の吸水ゲルをアルカリ物質により処
理する方法が知られている（特公昭53−13495、特公昭5
3−13678）。しかし、この方法によると、液状化するた
めには多量のアルカリ物質を必要とし、また用途によっ
ては処理後の液を中和する必要があるが中和することに
よって副生塩が生成しその除去が必要である等の問題点
があった。Conventionally, a liquid superabsorbent resin is produced by liquefying a solid water-absorbing gel. As a method for liquefying this solid water-absorbing gel, a method of treating the solid water-absorbing gel with an alkaline substance is known (Japanese Patent Publication Nos. 53-13495 and 5-5).
3-13678). However, according to this method, a large amount of alkaline substance is required for liquefaction, and depending on the application, it is necessary to neutralize the liquid after treatment. There was a problem that was necessary.
〈発明が解決しようとする課題〉 そこで本発明者はアルカリ物質を用いないで液状化
し、上記の問題点のない方法を見出すべく検討した結
果、本発明を完成した。<Problems to be Solved by the Invention> Therefore, the present inventor has completed the present invention as a result of conducting a liquefaction without using an alkaline substance and conducting a study to find a method free from the above problems.
〈課題を解決するための手段〉 本発明は、固体の吸水ゲルを、水媒体中にて酸化剤で
処理し、吸水ゲルを水に溶解せしめて、液状高吸水性樹
脂を製造する方法を提供するものである。<Means for Solving the Problems> The present invention provides a method for producing a liquid superabsorbent resin by treating a solid water-absorbing gel with an oxidizing agent in an aqueous medium and dissolving the water-absorbing gel in water. To do.
ここで固体の吸水ゲルとは、それ自体では常温の水に
不要で、自重の10〜1000倍の吸水能力を有する高吸水性
樹脂をいい、ポリアクリル酸塩系の架橋物、イソブチレ
ンと無水マレイン酸との共重合体架橋物、あるいはビニ
ルエステルとエチレン系不飽和カルボン酸又はそのエス
テルとの共重合体のアルカリによるケン化物等が例示さ
れる。特に、ビニルエステルとエチレン系不飽和カルボ
ン酸又はそのエステルとの共重合体のケン化物に対し
て、本発明の効果が顕著に発揮される。Here, the solid water-absorbing gel means a highly water-absorbent resin which is not necessary for water at room temperature by itself and has a water-absorbing capacity of 10 to 1000 times its own weight, and a polyacrylate cross-linked product, isobutylene and maleic anhydride. Examples thereof include a crosslinked product of a copolymer with an acid, or a saponified product of a copolymer of a vinyl ester and an ethylenically unsaturated carboxylic acid or its ester with an alkali. In particular, the effect of the present invention is remarkably exerted on a saponified product of a copolymer of a vinyl ester and an ethylenically unsaturated carboxylic acid or its ester.
本発明において用いられる酸化剤としては水溶性の無
機系過酸化物、過硫酸塩、過塩素酸塩等が例示される。
この中では、無機系過酸化物はその水溶液の高吸水性樹
脂への吸水量が高いので好適に用いられる。その中でも
特に過酸化水素水（H2O2）が液状化の効果がすぐれてお
り好ましい。又酸化剤をレドックス系とする事もよい。
すなわち第２鉄塩、アミン系化合物の併用も可能であ
る。Examples of the oxidizing agent used in the present invention include water-soluble inorganic peroxides, persulfates, and perchlorates.
Among these, inorganic peroxides are preferably used because the amount of water absorption of the aqueous solution of the superabsorbent resin is high. Among them, hydrogen peroxide water (H 2 O 2 ) is particularly preferable because of its excellent liquefaction effect. It is also preferable to use a redox type oxidizing agent.
That is, it is possible to use a ferric salt and an amine compound together.
固体の吸水ゲルを酸化剤で処理する方法としては、水
に吸水ゲルを分散させ、酸化剤を添加した後昇温し、吸
水ゲルが液状化するまで保温する方法、又は酸化剤を添
加した水に吸水ゲルを添加、分散させた後昇温し、吸水
ゲルが液状化するまで保温する方法等が例示される。こ
のうち酸化剤を添加した水に吸水ゲルを添加する方法
が、酸化剤を均一に吸収させることができるので好まし
い。As a method of treating a solid water-absorbing gel with an oxidizing agent, a method of dispersing the water-absorbing gel in water, heating after adding the oxidizing agent, keeping the temperature until the water-absorbing gel is liquefied, or water added with an oxidizing agent Examples of the method include adding a water-absorbing gel to and dispersing the temperature, and then raising the temperature and keeping the temperature until the water-absorbing gel is liquefied. Of these, the method of adding the water-absorbing gel to the water containing the oxidizing agent is preferable because the oxidizing agent can be absorbed uniformly.
酸化剤で処理するための条件、酸化剤濃度、量、処理
時間、処理温度は特に限定されない。例えば、処理時間
を短かくしようとすれば、酸化剤濃度や処理温度を上げ
る必要がある。ただし、酸化剤濃度は30ppm以上、酸化
剤の量は樹脂に対して0.1重量％以上、処理温度は50℃
以上であることが望ましい。The conditions for treatment with the oxidizing agent, the concentration of the oxidizing agent, the amount, the treating time, and the treating temperature are not particularly limited. For example, in order to shorten the processing time, it is necessary to raise the oxidant concentration and the processing temperature. However, the oxidizer concentration is 30 ppm or higher, the amount of oxidizer is 0.1 wt% or higher with respect to the resin, and the processing temperature is 50 ° C.
It is desirable that this is the case.
これらの値を下回る場合には、処理時間が100時間以
上必要であり、実用的でない。又処理温度については12
0℃以下が好ましい。この温度を超えると、反応系を高
圧にする必要が生じ、又、反応が早すぎてコントロール
が困難となる。When it is less than these values, the treatment time is 100 hours or more, which is not practical. The processing temperature is 12
0 ° C. or lower is preferred. Above this temperature, it becomes necessary to raise the pressure of the reaction system, and the reaction becomes too fast, making control difficult.
＜発明の効果＞ 本発明の方法は、アルカリ物質を用いないので処理後
の液を中和する必要がない。従って副生塩は生成せずそ
の除去も不要である。<Effect of the Invention> Since the method of the present invention does not use an alkaline substance, it is not necessary to neutralize the treated liquid. Therefore, by-product salt is not generated and its removal is unnecessary.
＜実施例＞ 次に実施例により本発明をさらに詳細に説明する。<Example> Next, the present invention will be described in more detail with reference to examples.
実施例 イオン交換水1kgに過酸化水素を表の所定の濃度にな
るように添加し、攪拌混合する。このように調整した過
酸化水素水溶液に、スミカゲルＳ−50（住友化学社製高
吸水性樹脂、アクリル酸メチルと酢酸ビニルの共重合体
のケン化物）を乾燥樹脂分で50gになるように添加し、
表の所定の温度になるまで昇温する。同温度で保温し溶
解するまでの時間を測定した。結果を表−１に示す。Example Hydrogen peroxide was added to 1 kg of ion-exchanged water to a predetermined concentration shown in the table, and mixed by stirring. Sumikagel S-50 (Sumitomo Chemical Co., Ltd. superabsorbent resin, saponified copolymer of methyl acrylate and vinyl acetate) was added to the thus prepared aqueous hydrogen peroxide solution so that the dry resin content was 50 g. Then
The temperature is raised until it reaches the prescribed temperature in the table. The temperature was kept at the same temperature and the time until dissolution was measured. The results are shown in Table 1.
なお、Ｓ−50が溶解し系の粘度が500cps（25℃）とな
った時間を溶解するまでの時間とした。The time until S-50 was dissolved and the viscosity of the system reached 500 cps (25 ° C) was taken as the time until dissolution.
Claims (3)
ンと無水マレイン酸との共重合体架橋物、およびビニル
エステルとエチレン系不飽和カルボン酸又はそのエステ
ルとの共重合体のケン化物から選ばれ、それ自体では常
温の水に不溶で、自重の10〜1000倍の吸水能力を有する
固体の吸水ゲルを、水媒体中にて酸化剤で処理し、吸水
ゲルを水に溶解せしめることを特徴とする液状高吸水性
樹脂の製造法。1. A polyacrylic acid-based crosslinked product, a copolymer crosslinked product of isobutylene and maleic anhydride, and a saponified product of a copolymer of a vinyl ester and an ethylenically unsaturated carboxylic acid or its ester. It is insoluble in water at room temperature by itself, and a solid water-absorbing gel having a water-absorbing capacity of 10 to 1000 times its own weight is treated with an oxidizing agent in an aqueous medium to dissolve the water-absorbing gel in water. And a method for producing a liquid superabsorbent resin.
添加した後昇温し、吸水ゲルが液状化するまで保温する
請求項１記載の方法。2. The method according to claim 1, wherein the water-absorbent gel is dispersed in water, an oxidizing agent is added thereto, the temperature is raised, and the temperature is kept until the water-absorbent gel is liquefied.
分散させた後昇温し、吸水ゲルが液状化するまで保温す
る請求項１記載の方法。3. A water-absorbing gel is added to water containing an oxidizing agent,
The method according to claim 1, wherein the temperature is raised after the dispersion and the temperature is kept until the water-absorbing gel is liquefied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63114472A JP2679107B2 (en) | 1988-05-10 | 1988-05-10 | Liquid super absorbent resin manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63114472A JP2679107B2 (en) | 1988-05-10 | 1988-05-10 | Liquid super absorbent resin manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01284507A JPH01284507A (en) | 1989-11-15 |
| JP2679107B2 true JP2679107B2 (en) | 1997-11-19 |
Family
ID=14638588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63114472A Expired - Fee Related JP2679107B2 (en) | 1988-05-10 | 1988-05-10 | Liquid super absorbent resin manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2679107B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1568718A1 (en) * | 2004-02-19 | 2005-08-31 | Waltech AG | Method of modifying polyacrylates for obtaining high molecular polymers and the polymers obtained |
| US9150679B2 (en) | 2011-05-17 | 2015-10-06 | Sumitomo Seika Chemicals Co., Ltd. | Saponification product of vinyl ester/ethylenically unsaturated carboxylic acid ester copolymer and process for producing the same |
| EP3957679A4 (en) | 2019-04-16 | 2023-01-11 | Sanyo Chemical Industries, Ltd. | Method for producing water-absorbing resin particles |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5033839B2 (en) * | 1971-09-28 | 1975-11-04 | ||
| JPS5313678A (en) * | 1976-07-23 | 1978-02-07 | Toppan Printing Co Ltd | Process for making lunch boxes with partition plates |
| JPH0610206B2 (en) * | 1985-07-20 | 1994-02-09 | 出光石油化学株式会社 | Terpolymer aqueous solution |
-
1988
- 1988-05-10 JP JP63114472A patent/JP2679107B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01284507A (en) | 1989-11-15 |
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