JPS5966423A - Preparation of water absorbing resin - Google Patents
Preparation of water absorbing resinInfo
- Publication number
- JPS5966423A JPS5966423A JP17739282A JP17739282A JPS5966423A JP S5966423 A JPS5966423 A JP S5966423A JP 17739282 A JP17739282 A JP 17739282A JP 17739282 A JP17739282 A JP 17739282A JP S5966423 A JPS5966423 A JP S5966423A
- Authority
- JP
- Japan
- Prior art keywords
- polyacrylic acid
- water absorbing
- aqueous solution
- absorbing resin
- cation
- 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
- 229920005989 resin Polymers 0.000 title claims abstract description 12
- 239000011347 resin Substances 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 14
- 229920002125 Sokalan® Polymers 0.000 claims abstract description 11
- 239000004584 polyacrylic acid Substances 0.000 claims abstract description 11
- 150000001768 cations Chemical class 0.000 claims abstract description 9
- -1 aluminum ion Chemical class 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract 3
- 150000007942 carboxylates Chemical class 0.000 claims abstract 3
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 150000001735 carboxylic acids Chemical class 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 229920003002 synthetic resin Polymers 0.000 claims 1
- 239000000057 synthetic resin Substances 0.000 claims 1
- 239000007864 aqueous solution Substances 0.000 abstract description 11
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 6
- 229910000030 sodium bicarbonate Inorganic materials 0.000 abstract description 4
- 235000017557 sodium bicarbonate Nutrition 0.000 abstract description 4
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 229910001388 sodium aluminate Inorganic materials 0.000 abstract description 2
- 238000004132 cross linking Methods 0.000 abstract 1
- 230000003472 neutralizing effect Effects 0.000 abstract 1
- 239000001509 sodium citrate Substances 0.000 abstract 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 abstract 1
- 230000002745 absorbent Effects 0.000 description 4
- 239000002250 absorbent Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- JDPVAUXDCGENPV-UHFFFAOYSA-B C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].[Th+4].C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].[Th+4].[Th+4] Chemical compound C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].[Th+4].C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].[Th+4].[Th+4] JDPVAUXDCGENPV-UHFFFAOYSA-B 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Landscapes
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は吸水性樹脂のイオン性水溶液中に於ける吸水性
能の改善に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improving the water absorption performance of a water absorbent resin in an ionic aqueous solution.
吸水性樹脂は一般的に電解質高分子を適ｉｉ架橋したも
のが性能に於て優れ、特にポリアクリル酸はその代表的
なものであるが、これ等はイオン性水溶液中に於ける吸
水性能が著しく低下する欠点を有している。しかもこれ
等を必要とする使用上の環境は程度の差はあってもイオ
ンが存在する。Generally, water-absorbing resins that are cross-linked with electrolyte polymers have excellent performance, and polyacrylic acid is a typical example, but these have poor water-absorbing performance in ionic aqueous solutions. It has the disadvantage of significantly lowering the temperature. Moreover, ions are present to varying degrees in the environments in which they are used.
本発明は如上の性能改善を、水溶液中に存在するイオン
の吸水性樹脂に対する影響を緩１１１することで得よう
とするものであるが、陽イオンが１価の飽和カルボン酸
塩は緩衝作用を示ずものが多く、それ等の内、酸性度が
ポリアクリル酸のそれより弱くて陽イオンが同じものは
水溶液中に於ける吸水性樹脂の吸水性能に影響する程度
が低い。又、陽イオンが同じ場合、酸の状態で添加後中
和することも出来、製法上便利であるし、芳香族系のも
のには防腐作用を示すものもあり、樹脂の保存安定にも
役立つ。The present invention aims to achieve the above performance improvement by relaxing the influence of ions present in an aqueous solution on the water-absorbing resin, but saturated carboxylate salts with monovalent cations have a buffering effect. Of these, those whose acidity is weaker than that of polyacrylic acid and whose cations are the same have a low degree of influence on the water absorption performance of the water absorbent resin in an aqueous solution. In addition, if the cations are the same, it can be neutralized after addition in the acid state, which is convenient for the manufacturing process, and some aromatic compounds have a preservative effect, which is useful for the storage stability of the resin. .
以下、本発明の好適実施例を説明する。Preferred embodiments of the present invention will be described below.
（実施例１）
過硫酸塩を触媒として重合したポリアクリル酸１０％水
溶液を稀釈して１％溶液とし、水酸化ナトリウムを加え
てＰＨ６程度に中和した後、ポリアクリル酸固形分に対
する４％重量部のアルミン酸すトリウムを水に溶かして
添加し、充分混合し、１０時間以上放置した後、Ｐ Ｈ
が一定するまでの量よりやや過剰の量の炭酸水素ナトリ
ウムとボリアクリル酸固形分の２０％重量部のクエン酸
すトリウムとを加えた水溶液を乾燥する。(Example 1) A 10% aqueous solution of polyacrylic acid polymerized using persulfate as a catalyst was diluted to a 1% solution, and sodium hydroxide was added to neutralize it to about pH 6. Part by weight of sodium aluminate was dissolved in water and added, thoroughly mixed and left for more than 10 hours, followed by P H
An aqueous solution containing a slightly excess amount of sodium bicarbonate and 20% by weight of thorium citrate based on the polyacrylic acid solid content is dried.
このようにして得られた吸水性樹脂の１％水溶液中に於
ける吸水量は自重の２８０４（’Ｉ以上を示し、従来の
吸水性樹脂の約２．５〜３倍の性能であった。この性能
向」−の効果は炭酸水素ナトリウムの添加も影響し、中
和度を常に１００％に保ぢ得ると共に、残存する炭酸水
素ナトリウムも又緩衝作用をものと思われる。The water absorption amount of the thus obtained water absorbent resin in a 1% aqueous solution was 2804 ('I) or more than its own weight, and the performance was about 2.5 to 3 times that of conventional water absorbent resins. This performance improvement effect is also influenced by the addition of sodium hydrogen carbonate, and the degree of neutralization can always be maintained at 100%, and the remaining sodium hydrogen carbonate also seems to have a buffering effect.
（実施例２）
実施例１に於て加えたものと等モルのクエン酸を予めポ
リアクリル酸水溶液に溶解した後、実施例１の如く中和
架橋したものの吸水性能も」−記と変りがなかった。(Example 2) The water absorption performance of the same mole of citric acid added in Example 1 was dissolved in an aqueous polyacrylic acid solution and then neutralized and crosslinked as in Example 1. There wasn't.
尚、本発明に於て使用出来るカルボン酸は、前記の如く
酸性度がポリアクリル酸より弱く旧つ水に可溶性であれ
ば適宜選択出来るし、水溶液のイオン濃度によって添加
量を加減することも可能である。As mentioned above, the carboxylic acid that can be used in the present invention can be appropriately selected as long as it has weaker acidity than polyacrylic acid and is soluble in water, and the amount added can be adjusted depending on the ion concentration of the aqueous solution. It is.
以上の如く本発明による吸水性樹脂の製造方法は、工業
的製法に好適であって月つ性能及び経済性に優れたもの
である。As described above, the method for producing a water-absorbing resin according to the present invention is suitable for industrial production and is excellent in terms of performance and economy.
Claims (1)
ンにより中和架橋する吸水性樹脂の製造方法に於て、前
記陽イオンのカルボン酸塩を存在させることを特徴とす
る吸水性樹脂の製造方法。 ■ポリアクリル酸水溶液に予め飽和カルボン酸を溶解し
た後、中和架橋する前記第０項記載の方法。[Claims] ■ A method for producing a water-absorbing resin in which polyacrylic acid is neutralized and cross-linked with a monovalent cation and an aluminum ion, characterized in that a carboxylate of the cation is present. method for producing synthetic resin. (2) The method according to item 0 above, wherein a saturated carboxylic acid is dissolved in an aqueous polyacrylic acid solution in advance, and then neutralized and crosslinked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57177392A JPS6023122B2 (en) | 1982-10-08 | 1982-10-08 | Manufacturing method of water absorbent resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57177392A JPS6023122B2 (en) | 1982-10-08 | 1982-10-08 | Manufacturing method of water absorbent resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5966423A true JPS5966423A (en) | 1984-04-14 |
| JPS6023122B2 JPS6023122B2 (en) | 1985-06-06 |
Family
ID=16030131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57177392A Expired JPS6023122B2 (en) | 1982-10-08 | 1982-10-08 | Manufacturing method of water absorbent resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6023122B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999055393A1 (en) * | 1998-04-28 | 1999-11-04 | Sca Hygiene Products Ab | Absorbent structure having improved absorption properties |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51136588A (en) * | 1975-05-09 | 1976-11-26 | Nat Starch Chem Corp | Surface treatment for dispersion improvement of hygroscopic composites |
| JPS5744627A (en) * | 1980-08-29 | 1982-03-13 | Seitetsu Kagaku Co Ltd | Improvement of water absorption of water-absorbing polymer of acrylic acid salt |
| JPS6025045A (en) * | 1983-07-20 | 1985-02-07 | Teac Co | Magnetic tape device |
-
1982
- 1982-10-08 JP JP57177392A patent/JPS6023122B2/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51136588A (en) * | 1975-05-09 | 1976-11-26 | Nat Starch Chem Corp | Surface treatment for dispersion improvement of hygroscopic composites |
| JPS5744627A (en) * | 1980-08-29 | 1982-03-13 | Seitetsu Kagaku Co Ltd | Improvement of water absorption of water-absorbing polymer of acrylic acid salt |
| JPS6025045A (en) * | 1983-07-20 | 1985-02-07 | Teac Co | Magnetic tape device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999055393A1 (en) * | 1998-04-28 | 1999-11-04 | Sca Hygiene Products Ab | Absorbent structure having improved absorption properties |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6023122B2 (en) | 1985-06-06 |
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