JPS6227847B2 - - Google Patents
Info
- Publication number
- JPS6227847B2 JPS6227847B2 JP53005930A JP593078A JPS6227847B2 JP S6227847 B2 JPS6227847 B2 JP S6227847B2 JP 53005930 A JP53005930 A JP 53005930A JP 593078 A JP593078 A JP 593078A JP S6227847 B2 JPS6227847 B2 JP S6227847B2
- Authority
- JP
- Japan
- Prior art keywords
- acrylic acid
- agent
- water
- acrylamide
- alkali
- 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
- 239000003795 chemical substances by application Substances 0.000 claims description 27
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 20
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 16
- 239000004202 carbamide Substances 0.000 claims description 16
- 239000003513 alkali Substances 0.000 claims description 13
- 230000008961 swelling Effects 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000003431 cross linking reagent Substances 0.000 claims description 8
- 239000003349 gelling agent Substances 0.000 claims description 8
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 7
- 229920001577 copolymer Polymers 0.000 claims description 7
- 239000000178 monomer Substances 0.000 claims description 6
- 230000003472 neutralizing effect Effects 0.000 claims description 6
- 238000006116 polymerization reaction Methods 0.000 claims description 5
- -1 N,N-disubstituted acrylamide Chemical class 0.000 claims description 4
- 230000007062 hydrolysis Effects 0.000 claims description 4
- 238000006460 hydrolysis reaction Methods 0.000 claims description 4
- 238000004132 cross linking Methods 0.000 claims 2
- 238000001879 gelation Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 230000000379 polymerizing effect Effects 0.000 claims 1
- 238000010298 pulverizing process Methods 0.000 claims 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 229920000642 polymer Polymers 0.000 description 9
- CNCOEDDPFOAUMB-UHFFFAOYSA-N N-Methylolacrylamide Chemical compound OCNC(=O)C=C CNCOEDDPFOAUMB-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 235000011121 sodium hydroxide Nutrition 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 4
- 238000007334 copolymerization reaction Methods 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 229920002125 Sokalan® Polymers 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 150000004677 hydrates Chemical class 0.000 description 2
- 239000000976 ink Substances 0.000 description 2
- 239000004584 polyacrylic acid Substances 0.000 description 2
- XXQBEVHPUKOQEO-UHFFFAOYSA-N potassium superoxide Chemical compound [K+].[K+].[O-][O-] XXQBEVHPUKOQEO-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- BJELTSYBAHKXRW-UHFFFAOYSA-N 2,4,6-triallyloxy-1,3,5-triazine Chemical compound C=CCOC1=NC(OCC=C)=NC(OCC=C)=N1 BJELTSYBAHKXRW-UHFFFAOYSA-N 0.000 description 1
- WHNPOQXWAMXPTA-UHFFFAOYSA-N 3-methylbut-2-enamide Chemical compound CC(C)=CC(N)=O WHNPOQXWAMXPTA-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002304 perfume Substances 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 235000011118 potassium hydroxide Nutrition 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
- 239000011345 viscous material Substances 0.000 description 1
Landscapes
- Cultivation Of Plants (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Polyurethanes Or Polyureas (AREA)
Description
【発明の詳細な説明】
本発明は育苗その他の植物栽培床の保水剤（給
水剤）、香料、インクその他各種液状物質の含浸
用担体等、多方面にわたり利用することの出来る
膨潤性保水剤及びその製造方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention is a swellable water-retaining agent that can be used in a wide range of applications, such as a water-retaining agent for seedlings and other plant cultivation beds, a carrier for impregnating fragrances, inks, and various other liquid substances. The present invention relates to a manufacturing method thereof.
ポリアクリル酸架橋物が水膨潤性であり水溶液
中でポリマーゲルを形成することは、多くの文献
等により周知の事実であるが、高コスト等の原因
により未だ汎用、多用されるまでには至つていな
い。本発明はこの点を解決するためのもので、安
価な尿素を主成分として共重合させることにより
経済的でしかも高性能の膨潤性を示す保水剤を得
ることを目的とするものである。 It is a well-known fact from many documents that cross-linked polyacrylic acid is water-swellable and forms a polymer gel in an aqueous solution, but due to high cost and other reasons, it has not yet been widely used. It's not working. The present invention is intended to solve this problem, and aims to obtain an economical water retention agent that exhibits high swelling properties by copolymerizing inexpensive urea as a main component.
本発明の膨潤性保水剤は尿素、アクリル酸並び
に架橋剤乃至ゲル化剤を共重合して得られる。共
重合に際し、水その他適当な溶媒を用いることも
できる。共重合体成分の一つであるアクリル酸に
かえて、加水分解によりアクリル酸となり得るモ
ノマー成分例えばアクリルアミド等を共重合させ
ることもでき、共重合させたものを加水分解して
も所期の膨潤性保水剤が得られる。 The swellable water retention agent of the present invention is obtained by copolymerizing urea, acrylic acid, and a crosslinking agent or gelling agent. Water and other suitable solvents can also be used during copolymerization. Instead of acrylic acid, which is one of the copolymer components, it is also possible to copolymerize a monomer component that can become acrylic acid by hydrolysis, such as acrylamide, and even if the copolymerized product is hydrolyzed, it will not swell as desired. A moisturizing agent is obtained.
架橋剤乃至ゲル化剤としてはアクリル酸と共重
合してこれを架橋あるいはゲル化せしめるもので
あることが必要で、Ｎ−メチロールアクリルアミ
ド等のアクリルアミドＮ−モノ置換体、Ｎ，Ｎ−
ジメチルアクリルアミド等のアクリルアミドＮ，
Ｎ−ジ置換体、α置換アクリル酸、シアヌール酸
トリアリル、その他数多くのものから適宜選択し
て使用することができる。このうちＮ−メチロー
ルアクリルアミドがとくに有効で好結果が得られ
る。このＮ−メチロールアクリルアミドの使用量
はモノマー100重量部に対し通常５〜20重量部が
適当であるが、製品に要求される膨潤倍率、膨潤
状態でのゲルの硬さ等に合致するように、使用す
る架橋剤乃至ゲル化剤の種類、尿素とアクリル酸
の共重合割合、その他重合条件に応じ適宜選定す
る。 The crosslinking agent or gelling agent must be one that copolymerizes with acrylic acid to crosslink or gel it, such as N-monosubstituted acrylamides such as N-methylolacrylamide, N,N-
Acrylamide N such as dimethylacrylamide,
It can be appropriately selected from N-disubstituted acrylic acid, α-substituted acrylic acid, triallyl cyanurate, and many others. Among these, N-methylolacrylamide is particularly effective and good results can be obtained. The appropriate amount of N-methylolacrylamide to be used is usually 5 to 20 parts by weight per 100 parts by weight of the monomer, but it should be adjusted to match the swelling ratio required for the product, the hardness of the gel in the swollen state, etc. It is appropriately selected depending on the type of crosslinking agent or gelling agent used, the copolymerization ratio of urea and acrylic acid, and other polymerization conditions.
膨潤性保水剤の共重合成分たる尿素の使用量
も、製品の膨潤性保水剤の用途などに対応して必
要な膨潤保水性能、経済性などを考慮して適宜決
定されるが、一般的には尿素成分はアクリル酸や
架橋剤乃至ゲル化剤を含む全体量に対し50〜90重
量％程度が好ましく、尿素成分が50重量％以下で
は膨潤率が低くなり、90重量％以上では水に溶解
する傾向が現われる。共重合体中のアクリル酸部
分をアルカリで中和することは製品の膨潤性保水
剤の性能を向上するのに有効である。共重合した
後共重合物をアルカリで中和する方法、共重合に
先立ちアクリル酸モノマー成分を予め中和した後
共重合する方法のいずれも採用し得るが、前者の
方法で中和するほうがより効果的である。中和方
法としては、未中和の共重合物を粉砕し水を加え
これにアルカリを添加して中和しその後乾燥する
方法、粉砕した未中和の共重合体に、アルカリ粉
粒物又は適当な担体にアルカリを添加した粉粒状
物を混合しておく方法、粉砕した未中和の共重合
体と、アルカリ又はアルカリと適当な増量剤とか
らなる粘性物質を練り合わせておく方法、含浸さ
せる水その他の液状物質にアルカリを添加してお
く方法なども可能である。通常アルカリとしては
苛性ソーダ苛性カリなどを用いる。 The amount of urea used, which is a copolymerized component of the swellable water-retaining agent, is determined as appropriate, taking into consideration the necessary swelling water-retaining performance, economic efficiency, etc., depending on the intended use of the swellable water-retaining agent. The urea component is preferably about 50 to 90% by weight based on the total amount including acrylic acid and crosslinking agent or gelling agent. If the urea component is less than 50% by weight, the swelling rate will be low, and if it is more than 90% by weight, it will dissolve in water. There is a tendency to Neutralizing the acrylic acid moiety in the copolymer with an alkali is effective in improving the performance of the product's swelling water retention agent. Either a method of neutralizing the copolymerized product with an alkali after copolymerization or a method of neutralizing the acrylic acid monomer component before copolymerization and then copolymerizing can be adopted, but the former method is preferable. Effective. Neutralization methods include crushing the unneutralized copolymer, adding water to it, neutralizing it by adding an alkali, and then drying it; A method of mixing a powder or granular material with an alkali added to a suitable carrier, a method of kneading a pulverized unneutralized copolymer and a viscous substance consisting of an alkali or an alkali and a suitable filler, and impregnation. It is also possible to add an alkali to water or other liquid substance. Usually, caustic soda or caustic potash is used as the alkali.
以下、本発明の実施例を示す。 Examples of the present invention will be shown below.
（実施例 １）
尿素…60重量部、アクリル酸…10重量部、Ｎ−
メチロールアクリルアミド…５重量部を、約60℃
で溶解し、これを触媒（過硫酸カリ）により重合
させて発泡状の重合物を得た。(Example 1) Urea...60 parts by weight, acrylic acid...10 parts by weight, N-
Methylol acrylamide...5 parts by weight at approximately 60℃
This was polymerized using a catalyst (potassium persulfate) to obtain a foamed polymer.
Ａ 当該重合物を粉砕し、水（都市上水道、以下
同じ）を加えるとゼリー状となつたが、膨潤率
は数10倍程度であつた。なお、PHは４程度であ
つた。A: When the polymer was pulverized and water (city water supply, the same applies hereinafter) was added, it became jelly-like, but the swelling rate was several ten times higher. In addition, the pH was about 4.
Ｂ 粉砕した重合物に苛性ソーダ水溶液を添加し
て中和したものはPH８程度であり、これに水を
加えると100倍位上に膨潤したゼリー状物質と
なつた。B. The pulverized polymer was neutralized by adding an aqueous solution of caustic soda and had a pH of about 8, and when water was added to it, it became a jelly-like substance that swelled about 100 times more.
（実施例 ２）
実施例１と同一の処方を約60℃で溶解後、苛性
ソーダ水溶液で中和し、触媒（過硫酸カリ）を添
加して重合したものに、水を加えると、数分で体
積比90倍程度に膨潤したゼリー状物質となつた。(Example 2) The same recipe as in Example 1 was dissolved at about 60°C, neutralized with an aqueous solution of caustic soda, and a catalyst (potassium persulfate) was added to polymerize. When water was added, the reaction occurred in a few minutes. It became a jelly-like substance that swelled to about 90 times its volume.
（実施例 ３）
尿素…30重量部、アクリル酸…10重量部、Ｎ−
メチロールアクリルアミド…５重量部を、約60℃
で溶解後、苛性ソーダ水溶液で中和し、触媒（過
硫酸カリ）を添加して発泡性の重合物を得た。こ
の重合物を粉砕して水を加えたところ、数分で体
積比100倍以上に膨潤した。又、実施例１のＢに
示したように重合後に苛性ソーダで中和させたも
のは、膨潤率が１割程度高くなつた。この実施例
３における水和物（水を含んで膨潤した保水剤）
は、実施例１及び２における水和物よりも硬さが
若干増していた。(Example 3) Urea...30 parts by weight, acrylic acid...10 parts by weight, N-
Methylol acrylamide...5 parts by weight at approximately 60℃
After dissolving in solution, the mixture was neutralized with an aqueous caustic soda solution, and a catalyst (potassium persulfate) was added to obtain a foamable polymer. When this polymer was crushed and water was added, it swelled to more than 100 times its volume within a few minutes. Further, as shown in B of Example 1, the swelling ratio was increased by about 10% when the polymer was neutralized with caustic soda after polymerization. Hydrate (water-retaining agent swollen with water) in this Example 3
had slightly increased hardness than the hydrates in Examples 1 and 2.
（実施例 ４）
尿素…60重量部、アクリルアミド…10重量部、
Ｎ−メチロールアクリルアミド…５重量部を、約
60℃で溶解したのち、触媒（過両酸カリ）を添加
して発泡状の重合物を得た。これを粉砕して希ア
ルカリで加水分解し、乾燥したものは実施例２と
同様のものであつて、水を加えると数分で体積比
50倍以上のゼリー状物質となつた。(Example 4) Urea...60 parts by weight, acrylamide...10 parts by weight,
N-methylol acrylamide...5 parts by weight, approx.
After melting at 60°C, a catalyst (potassium peroxide) was added to obtain a foamed polymer. This was pulverized and hydrolyzed with dilute alkali, and the dried product was the same as in Example 2, and when water was added, the volume ratio increased in a few minutes.
It became a jelly-like substance more than 50 times larger.
（実施例 ５）
Ｎ−メチロールアクリルアミドのかわりにメチ
レンビスアクリルアミド0.1重量部を加えた以外
は実施例１と同様に実施し重合物を得た。膨潤率
が３割程度低くなつたがゲルの硬さが向上した。(Example 5) A polymer was obtained in the same manner as in Example 1 except that 0.1 part by weight of methylenebisacrylamide was added instead of N-methylolacrylamide. Although the swelling rate decreased by about 30%, the hardness of the gel improved.
以上実施例に示したように尿素とアクリル酸と
を共重合させる他、重合後加水分解によりポリア
クリル酸となるアクリルアミド等のモノマーを、
尿素と共重合させたものを加水分解しても所期の
膨潤性保水剤が得られこのようにすれば好ましい
場合もある。 In addition to copolymerizing urea and acrylic acid as shown in the examples above, monomers such as acrylamide that become polyacrylic acid by hydrolysis after polymerization,
Even if a copolymer with urea is hydrolyzed, the desired swellable water retention agent can be obtained, and this may be preferable in some cases.
以上の各実施例における水和物（水を含んで膨
潤した保水剤）は、乾燥状態におけば条件により
数10分から数時間で乾燥したゲル状物質に復元し
再加水にもその膨潤性能は変わらなかつた。 The hydrates (water-retaining agents swollen with water) in each of the above examples will recover to a dry gel-like substance in several tens of minutes to several hours depending on the conditions in a dry state, and its swelling performance will remain unchanged even when rehydrated. It didn't change.
本発明は以上のごとく実施し得るものであり、
本発明によれば、尿素を主成分とするので重合時
の異常な温度上昇を制御し得る利点や経済性の面
で非常に大きなメリツトを持つ膨潤性保水剤であ
つて、しかも高い膨潤率、すなわち、高性能の保
水性能を持つ膨潤性保水剤が得られる。このよう
な膨潤性保水剤は、従来、大量に必要なため経済
性の面で使用できなかつた育苗その他の植物裁培
用保水剤（給水剤）として特に有効に活用でき
る。すなわち、粉粒物とした本発明の保水剤を土
壌又はこれに代る栽培床材料に適量混合しておけ
ば、散水乃至給水された水や土中の水分が保水剤
に吸収され、保水剤が膨潤して長期にわたり所定
の領域で水分を貯える事になるため、散水乃至給
水回数を大巾に減少させ得ると共に植物栽培不能
と考えられていたような砂れき地における植物栽
培をも可能ならしめ、更に植物の生育も良好なら
しめ得るのである。このような用途に供する場合
には、本発明保水剤に肥料成分を加えておくこと
もできる。 The present invention can be implemented as described above,
According to the present invention, it is a swellable water-retaining agent that contains urea as a main component and has great advantages in terms of the ability to control abnormal temperature rise during polymerization and economical efficiency. That is, a swellable water-retaining agent with high-performance water-retaining performance can be obtained. Such a swellable water-retaining agent can be particularly effectively used as a water-retaining agent (water supply agent) for growing seedlings and other plant cultivation, which has conventionally been uneconomical due to the large amount required. That is, if an appropriate amount of the water retention agent of the present invention in the form of powder is mixed with soil or an alternative cultivation bed material, the water that is sprinkled or supplied and the moisture in the soil will be absorbed by the water retention agent. Because the water swells and stores moisture in a predetermined area for a long period of time, the frequency of watering and watering can be greatly reduced, and it also makes it possible to grow plants on sandy soil, which was previously thought to be impossible. Moreover, the growth of plants can also be improved. When used for such purposes, a fertilizer component may be added to the water retention agent of the present invention.
勿論、本発明の保水剤は、上記とは異なる目的
のために水分を永く保留して湿潤性を保たなけれ
ばならないような部所又は物において、含水用担
体として用いることもできるし、香料、液肥、液
状接着剤、インク、その他水以外の液状物の含浸
用担体としても非常に有効に使用できる。 Of course, the water retention agent of the present invention can also be used as a moisture carrier in places or objects where moisture must be retained for a long time to maintain wetness for purposes other than those mentioned above, and it can also be used as a moisture carrier for perfumes. It can also be very effectively used as a carrier for impregnating liquid fertilizers, liquid adhesives, inks, and other liquids other than water.
そして本発明による製造方法は、本発明の保水
剤を合理的かつ経済的に製造するのに有効な方法
であり、当該保水剤の実用化を容易ならしめ得
る。 The production method according to the present invention is an effective method for producing the water retention agent of the present invention rationally and economically, and can facilitate the practical use of the water retention agent.
Claims (1)
して架橋あるいはゲル化せしめる架橋剤乃至ゲル
化剤を共重合させて成る尿素を主成分とする膨潤
性保水剤。 ２ 架橋剤乃至ゲル化剤としてアクリルアミドＮ
−モノ置換体又はアクリルアミドＮ，Ｎ−ジ置換
体を使用した特許請求の範囲１記載の膨潤性保水
剤。 ３ アクリル酸成分をアルカリで中和した特許請
求の範囲１又は２記載の膨潤性保水剤。 ４ アクリル酸成分を中和し得るアルカリを添加
含有させた特許請求の範囲１又は２記載の膨潤性
保水剤。 ５ 尿素とアクリル酸とを、架橋剤乃至ゲル化剤
の存在下加熱溶解重合させ、得られた共重合物を
粉砕することを特徴とする尿素を主成分とする膨
潤性保水剤の製造方法。 ６ アクリル酸として、加水分解によりアクリル
酸となり得るモノマーを用いる特許請求の範囲５
記載の製造方法。 ７ 加水分解によりアクリル酸となり得るモノマ
ーがアクリルアミドである特許請求の範囲６記載
の製造方法。 ８ 架橋剤乃至ゲル化剤としてアクリルアミドＮ
−モノ置換体又はアクリルアミドＮ，Ｎ−ジ置換
体を用いる特許請求の範囲５，６又は７記載の製
造方法。 ９ 共重合物を粉砕した後、アルカリで中和する
特許請求の範囲５乃至８のいずれかに記載の製造
方法。 １０ 重合前にアルカリで中和し、この後、共重
合させる特許請求の範囲５乃至８のいずれかに記
載の製造方法。[Scope of Claims] 1. A swellable water-retaining agent containing urea as a main component, which is obtained by copolymerizing urea, acrylic acid, and a crosslinking or gelling agent that is copolymerized with acrylic acid to cause crosslinking or gelation. 2 Acrylamide N as a crosslinking agent or gelling agent
The swellable water retention agent according to claim 1, which uses a -mono-substituted product or an N,N-disubstituted acrylamide product. 3. The swelling water retaining agent according to claim 1 or 2, wherein the acrylic acid component is neutralized with an alkali. 4. The swelling water-retaining agent according to claim 1 or 2, further comprising an alkali capable of neutralizing the acrylic acid component. 5. A method for producing a swellable water-retaining agent containing urea as a main component, which comprises heating, dissolving and polymerizing urea and acrylic acid in the presence of a crosslinking agent or gelling agent, and pulverizing the obtained copolymer. 6 Claim 5 in which a monomer that can become acrylic acid by hydrolysis is used as acrylic acid.
Manufacturing method described. 7. The manufacturing method according to claim 6, wherein the monomer that can be converted into acrylic acid by hydrolysis is acrylamide. 8 Acrylamide N as a crosslinking agent or gelling agent
8. The manufacturing method according to claim 5, 6 or 7, using a -mono-substituted product or an acrylamide N,N-disubstituted product. 9. The manufacturing method according to any one of claims 5 to 8, wherein the copolymer is pulverized and then neutralized with an alkali. 10. The manufacturing method according to any one of claims 5 to 8, which comprises neutralizing with an alkali before polymerization and then copolymerizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP593078A JPS5499196A (en) | 1978-01-23 | 1978-01-23 | Swellable water retention agent and its preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP593078A JPS5499196A (en) | 1978-01-23 | 1978-01-23 | Swellable water retention agent and its preparation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5499196A JPS5499196A (en) | 1979-08-04 |
| JPS6227847B2 true JPS6227847B2 (en) | 1987-06-17 |
Family
ID=11624603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP593078A Granted JPS5499196A (en) | 1978-01-23 | 1978-01-23 | Swellable water retention agent and its preparation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5499196A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021117895A1 (en) | 2019-12-13 | 2021-06-17 | 三ツ星ベルト株式会社 | Cogged v-belt |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59192026A (en) * | 1983-04-14 | 1984-10-31 | 三井化学株式会社 | Artificial soil for hydroponic culture |
| JPS6456785A (en) * | 1987-08-26 | 1989-03-03 | Toyo Kootetsudo Sando Kk | Water holding sand |
-
1978
- 1978-01-23 JP JP593078A patent/JPS5499196A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021117895A1 (en) | 2019-12-13 | 2021-06-17 | 三ツ星ベルト株式会社 | Cogged v-belt |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5499196A (en) | 1979-08-04 |
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