JPH03285921A - Production of water absorbing resin - Google Patents
Production of water absorbing resinInfo
- Publication number
- JPH03285921A JPH03285921A JP8511690A JP8511690A JPH03285921A JP H03285921 A JPH03285921 A JP H03285921A JP 8511690 A JP8511690 A JP 8511690A JP 8511690 A JP8511690 A JP 8511690A JP H03285921 A JPH03285921 A JP H03285921A
- Authority
- JP
- Japan
- Prior art keywords
- water
- metal salt
- absorbing resin
- polyacrylic acid
- acid metal
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 239000011347 resin Substances 0.000 title claims abstract description 22
- 229920005989 resin Polymers 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 19
- 150000003839 salts Chemical class 0.000 claims abstract description 18
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 5
- 229920000642 polymer Polymers 0.000 claims abstract description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 19
- 229920002125 Sokalan® Polymers 0.000 abstract description 10
- 239000004584 polyacrylic acid Substances 0.000 abstract description 10
- 239000013307 optical fiber Substances 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 238000004132 cross linking Methods 0.000 abstract description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract 1
- 229910052708 sodium Inorganic materials 0.000 abstract 1
- 239000011734 sodium Substances 0.000 abstract 1
- 238000004078 waterproofing Methods 0.000 abstract 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 10
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 10
- 239000002245 particle Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002250 absorbent Substances 0.000 description 4
- 230000002745 absorbent Effects 0.000 description 4
- 230000001678 irradiating effect Effects 0.000 description 4
- 239000003431 cross linking reagent Substances 0.000 description 3
- KUDUQBURMYMBIJ-UHFFFAOYSA-N 2-prop-2-enoyloxyethyl prop-2-enoate Chemical compound C=CC(=O)OCCOC(=O)C=C KUDUQBURMYMBIJ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 230000002522 swelling effect Effects 0.000 description 2
- 229920003169 water-soluble polymer Polymers 0.000 description 2
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 229940048053 acrylate Drugs 0.000 description 1
- 125000004386 diacrylate group Chemical group 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- YDKNBNOOCSNPNS-UHFFFAOYSA-N methyl 1,3-benzoxazole-2-carboxylate Chemical compound C1=CC=C2OC(C(=O)OC)=NC2=C1 YDKNBNOOCSNPNS-UHFFFAOYSA-N 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229940047670 sodium acrylate Drugs 0.000 description 1
- 229920000247 superabsorbent polymer Polymers 0.000 description 1
Landscapes
- Processes Of Treating Macromolecular Substances (AREA)
- Sealing Material Composition (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、吸水性樹脂の製法に関するものである。[Detailed description of the invention] [Industrial application field] The present invention relates to a method for producing a water absorbent resin.
ポリアクリル酸ナトリウムのような水溶性ポリマーを架
橋すると、架橋密度が高くなるにしたがって、樹脂の性
状が水溶性から不水溶性に変化することがよく知られて
いる。このような架橋水溶性ポリマーの典型例として、
アクリル酸ナトリウムモノマーをメチレンビスアクリル
アミド等の架橋剤と共重合させて得られるポリアクリル
酸ナトリウム架橋体がよ（知られており、この架橋ポリ
アクリル酸ナトリウムは高吸水性ポリマーとして各種の
分野で使用されている。It is well known that when a water-soluble polymer such as sodium polyacrylate is crosslinked, the properties of the resin change from water-soluble to water-insoluble as the crosslink density increases. Typical examples of such crosslinked water-soluble polymers include
A cross-linked sodium polyacrylate product obtained by copolymerizing sodium acrylate monomer with a cross-linking agent such as methylenebisacrylamide is known.This cross-linked sodium polyacrylate is used in various fields as a superabsorbent polymer. has been done.
しかしながら、上記のような架橋ポリアクリル酸ナトリ
ウムは、極めて大きな膨潤性を備えてはいるが、吸水速
度が比較的遅く、特に海水に対してはこの傾向が大きく
、これが実用上大きな障害になっている。例えば、上記
架橋ポリアクリル酸ナトリウムを光フアイバーケーブル
の止水剤として使用するには、光フアイバーケーブルが
海底ケーブルとして利用されることを考慮すると、架橋
ポリアクリル酸ナトリウムの吸水速度、特に海水に対す
る吸水速度を速めることが強く求められる。However, although the cross-linked sodium polyacrylate described above has extremely high swelling properties, its water absorption rate is relatively slow, especially in seawater, and this is a major obstacle in practical use. There is. For example, in order to use the above-mentioned cross-linked sodium polyacrylate as a water stop agent for optical fiber cables, considering that optical fiber cables are used as submarine cables, it is necessary to There is a strong need to increase the speed.
この発明は、このような事情に鑑みなされたもので、吸
水性樹脂の吸水速度を速めることをその目的とする。This invention was made in view of these circumstances, and its purpose is to increase the water absorption rate of a water-absorbing resin.
上記の目的を達成するため、この発明の吸水性樹脂の製
法は、架橋ポリアクリル酸金属塩を主成分とする吸水性
ポリマーに対して、水を含有させた状態で紫外線照射す
ることにより架橋ポリアクリル酸金属塩の架橋を一部は
ずすという構成をとる。In order to achieve the above object, the method for producing a water-absorbing resin of the present invention involves irradiating a water-absorbing polymer whose main component is a cross-linked metal salt of polyacrylate with ultraviolet rays while containing water. The structure is such that the crosslinks of the acrylic acid metal salt are partially removed.
本発明者らは、架橋ポリアクリル酸ナトリウムのような
吸水性樹脂の吸水速度を速めることを目的として一連の
研究を重ねた。その結果、上記架橋ポリアクリル酸金属
塩のような吸水性樹脂に対して、水を含有させた状態で
紫外線照射すると、上記吸水性樹脂粒子の表面側の架橋
がはずれて粒子表面部分に存在する分子が水溶性のポリ
アクリル酸ナトリウムに変わり、それによって吸水性樹
脂自体の親水性が向上し吸水速度が大幅に向上すること
を見いだし、この発明に到達した。The present inventors have conducted a series of studies aimed at increasing the water absorption rate of water-absorbing resins such as crosslinked sodium polyacrylate. As a result, when a water-absorbing resin such as the cross-linked polyacrylic acid metal salt is irradiated with ultraviolet rays while containing water, the cross-links on the surface side of the water-absorbing resin particles are removed and are present on the particle surface. This invention was achieved by discovering that the molecule changes to water-soluble sodium polyacrylate, thereby improving the hydrophilicity of the water-absorbing resin itself and greatly increasing the water absorption rate.
つぎに、この発明の詳細な説明する。Next, this invention will be explained in detail.
この発明は、架橋ポリアクリル酸金属塩をその対象とし
、これに紫外線照射を行う。This invention targets a crosslinked polyacrylic acid metal salt and irradiates it with ultraviolet rays.
上記架橋ポリアクリル酸金属塩としては、特に制限する
ものではないが、通常、架橋ポリアクリル酸ナトリウム
が用いられる。この場合、架橋ポリアクリル酸ナトリウ
ムの架橋を構成する架橋剤としては、特に限定するもの
ではないが、メチレンビスアクリルアミド、ポリメチロ
ールプロパンポリアクリレート、エチレングリコールジ
アクリレート、ポリエチレングリコールジアクリレート
、ネオペンチルグリコールジアクリレート、テトラメチ
ロールメタンテトラアクリレート等の架橋剤が用いられ
る。The crosslinked polyacrylic acid metal salt is not particularly limited, but crosslinked sodium polyacrylate is usually used. In this case, the crosslinking agent constituting the crosslinking of the crosslinked sodium polyacrylate is not particularly limited, but methylene bisacrylamide, polymethylolpropane polyacrylate, ethylene glycol diacrylate, polyethylene glycol diacrylate, neopentyl glycol diacrylate, Crosslinking agents such as acrylate and tetramethylolmethanetetraacrylate are used.
上記のような架橋ポリアクリル酸金属塩に対する紫外線
照射の方法は、特に限定するものではないが、通常、紫
外線照射装置ないしは紫外線ランプ等によって紫外線を
照射することが行われる。The method of irradiating the crosslinked polyacrylic acid metal salt with ultraviolet rays as described above is not particularly limited, but irradiation with ultraviolet rays is usually carried out using an ultraviolet irradiation device or an ultraviolet lamp.
上記のように、紫外線を照射するに際して、架橋ポリア
クリル酸金属塩に水を５〜ＩＯ重量％（以下「％」と略
す）を含ませることが重要である、このように水を含浸
させることによって、初めて架橋ポリアクリル酸金属塩
のような吸水性樹脂の粒子表面の架橋がはずれるように
なる。そして、上記のような紫外線照射時間は、特に限
定するものではないが、５０゛Ｃにおいて１〜５分程度
の照射で足りる。これによって、上記のような吸水性樹
脂粒子の表面に存在する架橋ポリアクリル酸金属塩分子
においてその架橋がはずれ、それによって粒子表面が水
溶性のポリアクリル酸ナトリウムに変わる。その結果、
吸水性樹脂粒子の表面の親水性が高くなって吸水速度が
向上する。なお、内部は架橋ポリアクリル酸金属塩の分
子構造のままであり、それによって架橋ポリアクリル酸
金属塩自体の有する高吸水膨潤性を発揮する。As mentioned above, when irradiating with ultraviolet rays, it is important to include 5 to IO weight percent (hereinafter abbreviated as "%") of water in the crosslinked polyacrylic metal metal salt. Impregnation with water in this way This is the first time that the crosslinks on the particle surface of a water-absorbing resin such as a crosslinked metal salt of polyacrylic acid are removed. The duration of ultraviolet irradiation as described above is not particularly limited, but irradiation for about 1 to 5 minutes at 50°C is sufficient. As a result, the crosslinks in the crosslinked polyacrylic acid metal salt molecules existing on the surface of the water-absorbing resin particles as described above are removed, thereby changing the particle surface to water-soluble sodium polyacrylate. the result,
The hydrophilicity of the surface of the water-absorbing resin particles increases and the water absorption rate improves. Note that the internal structure remains the same as the molecular structure of the crosslinked polyacrylic metal salt, thereby exhibiting the high water absorption and swelling properties of the crosslinked polyacrylic metal salt itself.
つぎに、実施例について比較例と併せて説明する。Next, examples will be described together with comparative examples.
後記の第１表に示す吸水性樹脂を同表に示す量だけ水を
含浸させ、それを平皿上に面状に分布させ、その状態で
紫外線照射機から紫外線を照射した。つぎに、このよう
にして紫外線照射のなされた吸水性樹脂を７０℃で２４
時間乾燥し、目的とする吸水性樹脂を得た。このように
して得られた吸水性樹脂を人工海水に浸漬し３分後の吸
水倍率と２４時間後の吸水倍率を測定した。この場合、
吸水倍率は吸水前の重量と吸水させた後の重量とを対比
して示している。The water-absorbing resin shown in Table 1 below was impregnated with water in the amount shown in the table, and the impregnated water was distributed over a flat plate, and in this state it was irradiated with ultraviolet rays from an ultraviolet irradiator. Next, the water-absorbing resin that has been irradiated with ultraviolet rays in this way is heated at 70°C for 24 hours.
After drying for a period of time, the desired water-absorbing resin was obtained. The water absorbent resin thus obtained was immersed in artificial seawater, and the water absorption capacity after 3 minutes and the water absorption capacity after 24 hours were measured. in this case,
The water absorption capacity is shown by comparing the weight before water absorption and the weight after water absorption.
（以下余白）
上記の表から明らかなように、実施別品は３分後の吸水
倍率が比較別品に比べて大きく、したがって、吸水速度
が比較別品に比べて大幅に向上していることがわかる。(Left below) As is clear from the table above, the water absorption capacity of the tested product after 3 minutes is greater than that of the comparative product, and therefore the water absorption rate is significantly improved compared to the comparative product. I understand.
また、２４時間後の吸水倍率が比較別品とほぼ同等であ
り、上記紫外線照射によって吸水性樹脂自体の有する本
来の吸水性能が損なわれていないことがわかる。Furthermore, the water absorption capacity after 24 hours was almost the same as that of the comparative product, indicating that the original water absorption performance of the water absorbent resin itself was not impaired by the ultraviolet irradiation.
〔発明の効果］
以上のように、この発明の吸水性樹脂の製法によれば、
架橋ポリアクリル酸金属塩の吸水速度を架橋ポリアクリ
ル酸金属塩に対して水を含有させた状態で紫外線照射を
行うことにより、その吸水性能を損なうことなく大幅に
向上させることができるようになる。したがって、この
ようにして得られた吸水性樹脂は、吸水速度の速い用途
、例えば光フアイバーケーブルの止水剤として好適とな
る。[Effect of the invention] As described above, according to the method for producing a water absorbent resin of the present invention,
By irradiating the cross-linked polyacrylic acid metal salt with water while it contains water, it is now possible to significantly improve the water absorption rate of the cross-linked polyacrylic metal salt without impairing its water absorption performance. . Therefore, the water-absorbing resin thus obtained is suitable for applications where the water absorption rate is high, for example, as a water stop agent for optical fiber cables.
Claims (1)
ポリマーに対して、水を含有させた状態で紫外線照射す
ることにより架橋ポリアクリル酸金属塩の架橋を一部は
ずすことを特徴とする吸水性樹脂の製法。(1) A water-absorbing polymer whose main component is a cross-linked metal salt of polyacrylate is irradiated with ultraviolet rays while containing water to partially remove the crosslinks of the metal salt of cross-linked polyacrylate. Manufacturing method for water-absorbing resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8511690A JPH03285921A (en) | 1990-03-31 | 1990-03-31 | Production of water absorbing resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8511690A JPH03285921A (en) | 1990-03-31 | 1990-03-31 | Production of water absorbing resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03285921A true JPH03285921A (en) | 1991-12-17 |
Family
ID=13849658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8511690A Pending JPH03285921A (en) | 1990-03-31 | 1990-03-31 | Production of water absorbing resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03285921A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012502156A (en) * | 2008-09-12 | 2012-01-26 | ビーエーエスエフ ソシエタス・ヨーロピア | Water-absorbing material |
-
1990
- 1990-03-31 JP JP8511690A patent/JPH03285921A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012502156A (en) * | 2008-09-12 | 2012-01-26 | ビーエーエスエフ ソシエタス・ヨーロピア | Water-absorbing material |
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