JPS604842B2 - Manufacturing method of water absorbent resin - Google Patents
Manufacturing method of water absorbent resinInfo
- Publication number
- JPS604842B2 JPS604842B2 JP17739382A JP17739382A JPS604842B2 JP S604842 B2 JPS604842 B2 JP S604842B2 JP 17739382 A JP17739382 A JP 17739382A JP 17739382 A JP17739382 A JP 17739382A JP S604842 B2 JPS604842 B2 JP S604842B2
- Authority
- JP
- Japan
- Prior art keywords
- manufacturing
- hydrogen carbonate
- absorbent resin
- water absorbent
- water
- 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
Links
- 239000011347 resin Substances 0.000 title claims description 8
- 229920005989 resin Polymers 0.000 title claims description 8
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title description 7
- 230000002745 absorbent Effects 0.000 title 1
- 239000002250 absorbent Substances 0.000 title 1
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical group [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 8
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 150000001768 cations Chemical class 0.000 claims description 6
- -1 aluminum ions Chemical class 0.000 claims description 5
- 238000006386 neutralization reaction Methods 0.000 claims description 5
- 229920002125 Sokalan® Polymers 0.000 claims description 4
- 239000004584 polyacrylic acid Substances 0.000 claims description 4
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 4
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 229920000058 polyacrylate Polymers 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 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
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Description
【発明の詳細な説明】
ポリアクリル酸をアルミニウムイオンで架橋した吸水性
樹脂は既に提案されているが、本発明はそれ等に関する
工業的製法と性能の改善に関するものである。DETAILED DESCRIPTION OF THE INVENTION Water-absorbing resins made by crosslinking polyacrylic acid with aluminum ions have already been proposed, and the present invention relates to industrial production methods and improvements in performance thereof.
工業的にポリアクリル酸塩を製造する場合、その均質な
中和度を得ることは、使用原料の成分比や重合度の不均
質の原因で正確には不可能である。When producing polyacrylates industrially, it is impossible to obtain a uniform degree of neutralization due to the heterogeneity of the component ratio and degree of polymerization of the raw materials used.
然し乍ら中和度の不均質は樹脂の性能等に影響する。吸
水性樹脂に於ては、適量のアルミニウムイオンで架橋さ
れた残余の水素イオンの１００％は１価の陽イオンで置
換されることが望ましく、又、アルカリ等が過剰に存在
することも好ましくないが、特にイオン水溶液の吸水性
能や安定性に著しい相違が生じる。陽イオンが１価の炭
酸水素塩は、酸の存在により容易に分解して炭酸ガスを
発生するが、本発明はその現象に着目し、ポリアクリル
酸の１価の陽イオンによる中和度を１００％未満として
加えた後、中和度が１００％となるよりやや過剰の量の
炭酸水素塩を加えることにより、自動的に１００％中和
のポリァクリル酸塩が得られることが判明した。又、や
や過剰に加えた炭酸水素塩はそのまま樹脂中に存在する
が、イオン性溶液中に於ては残存する炭酸水素塩が緩衝
作用を示し、吸水性能が向上することも判明した。尚、
使用する炭酸水素塩は水溶液中及び大気中で安定なもの
が望ましく、アルカリ金属の塩は好ましいものであり、
以下に述べる本発明の好適実施例に於ては炭酸水素ナト
リウムを使用した。However, non-uniformity in the degree of neutralization affects the performance of the resin. In water-absorbing resins, it is desirable that 100% of the remaining hydrogen ions cross-linked with an appropriate amount of aluminum ions be replaced with monovalent cations, and it is also undesirable for an alkali etc. to be present in excess. However, there is a significant difference in the water absorption performance and stability of the ionic aqueous solution. Hydrogen carbonates with monovalent cations easily decompose in the presence of acids and generate carbon dioxide gas, but the present invention focused on this phenomenon and investigated the degree of neutralization of polyacrylic acid with monovalent cations. It has been found that by adding less than 100% and then adding a slightly excess amount of bicarbonate to achieve a degree of neutralization of 100%, a 100% neutralized polyacrylate can automatically be obtained. It has also been found that although the hydrogen carbonate added in slightly excess remains in the resin as it is, the remaining hydrogen carbonate exhibits a buffering effect in the ionic solution, improving water absorption performance. still,
The hydrogen carbonate used is preferably one that is stable in an aqueous solution and in the atmosphere, and an alkali metal salt is preferable.
Sodium bicarbonate was used in the preferred embodiment of the invention described below.
実施例過硫酸塩を触媒として重合したポリアクリル酸１
０％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ナトリウムを水
に溶解して加え、充分混合し、１独特間以上放置後ｐＨ
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
ウムを加えて乾燥するが、一定するｐＨ城は９前後であ
り、これはポリアクリル酸ナトリウムのｐＨと略−致す
る。Example Polyacrylic acid 1 polymerized using persulfate as a catalyst
Dilute the 0% aqueous solution to make a 1% solution, add sodium hydroxide to neutralize it to about pH 6, and then add 4% by weight of sodium aluminate based on the solid content of polyacrylate and lylic acid dissolved in water. After mixing and leaving for more than 1 hour, the pH
Drying is carried out by adding a slightly excessive amount of sodium bicarbonate until the pH becomes constant, but the pH remains constant at around 9, which is approximately the same as the pH of sodium polyacrylate.
このようにして得られた吸水性樹脂の１％食塩水中に於
ける吸水量は、従釆のものが自重の１００〜１２の音程
であるのに比較し、約２倍の２２針音の性能を有し、略
一定である。The water absorption amount of the water-absorbing resin obtained in this way in 1% saline solution is about 22 needles, which is about twice that of its own weight, compared to the 100 to 12 pitch of its own weight. is approximately constant.
又、高濃度のイオン水中に於ては炭酸水素ナトリウムの
添加量の多い方が高い吸水性能を得られたが、これはそ
の緩衝作用によるものと思われる。以上のように本発明
の吸水性樹脂の製造方法は工業的製法として好適であり
、しかも性能及び経済性に優れたものである。Furthermore, in highly concentrated ionized water, higher water absorption performance was obtained with a larger amount of sodium bicarbonate added, which is thought to be due to its buffering effect. As described above, the method for producing a water-absorbing resin of the present invention is suitable as an industrial production method, and has excellent performance and economical efficiency.
Claims (1)
が１００％未満のポリアクリル酸水溶液に前記陽イオン
の炭酸水素塩を加えることを特徴とする吸水性樹脂の製
造方法。 ２ 前記１価の陽イオンを水酸化ナトリウムとし、炭酸
水素塩を炭酸水素ナトリウムとする前記第１項記載の方
法。[Scope of Claims] 1. A method for producing a water-absorbing resin, which comprises adding a hydrogen carbonate of the cation to an aqueous polyacrylic acid solution in which the degree of neutralization by monovalent cations and aluminum ions is less than 100%. 2. The method according to item 1, wherein the monovalent cation is sodium hydroxide and the hydrogen carbonate is sodium hydrogen carbonate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17739382A JPS604842B2 (en) | 1982-10-08 | 1982-10-08 | Manufacturing method of water absorbent resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17739382A JPS604842B2 (en) | 1982-10-08 | 1982-10-08 | Manufacturing method of water absorbent resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5966424A JPS5966424A (en) | 1984-04-14 |
| JPS604842B2 true JPS604842B2 (en) | 1985-02-07 |
Family
ID=16030145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17739382A Expired JPS604842B2 (en) | 1982-10-08 | 1982-10-08 | Manufacturing method of water absorbent resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS604842B2 (en) |
-
1982
- 1982-10-08 JP JP17739382A patent/JPS604842B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5966424A (en) | 1984-04-14 |
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