JPS5910694B2 - Method for preventing adhesion of acrylamide polymer hydrogel - Google Patents
Method for preventing adhesion of acrylamide polymer hydrogelInfo
- Publication number
- JPS5910694B2 JPS5910694B2 JP15084776A JP15084776A JPS5910694B2 JP S5910694 B2 JPS5910694 B2 JP S5910694B2 JP 15084776 A JP15084776 A JP 15084776A JP 15084776 A JP15084776 A JP 15084776A JP S5910694 B2 JPS5910694 B2 JP S5910694B2
- Authority
- JP
- Japan
- Prior art keywords
- polyethylene glycol
- gel
- acrylamide
- hydrogel
- polymer
- 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
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- Processes Of Treating Macromolecular Substances (AREA)
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- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】
本発明は水溶性アクリルアミド系重合体の含水ゲルを粉
砕可能な状態迄に乾燥する過程における該重合体ゲルの
付着性を改善し効率良く乾燥を行なうことに関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to efficient drying by improving the adhesion of a water-containing acrylamide polymer gel in the process of drying the gel to a pulverizable state. .
アクリルアミド重合体、アクリルアミド重合体の部分加
水分解物（陰イオン性）あるいはアクリルアミドを含む
陽イオン性、あるいは非イオン性の共重合体など（以下
アクリルアミド系重合体と総称する）の水溶性重合体は
、紙力増強剤、抄紙用粘剤、あるいは水処理用凝集剤と
して近年その需要がいちじるしく増大している。Water-soluble polymers such as acrylamide polymers, partial hydrolysates of acrylamide polymers (anionic), and cationic or nonionic copolymers containing acrylamide (hereinafter collectively referred to as acrylamide polymers) are The demand for it as a paper strength enhancer, sticky agent for papermaking, or flocculant for water treatment has increased significantly in recent years.
アクリルアミド系重合体の重合方法には、水溶液重合法
、懸濁重合法、沈澱重合法など各種の方法が知られてい
るが、経済的でしかも容易に高分子量重合体が得られる
ことから水溶液重合法が最も広く用いられている。Various methods are known for polymerizing acrylamide-based polymers, such as aqueous solution polymerization, suspension polymerization, and precipitation polymerization. Legal is the most widely used.
そして水溶液重合法においては、重合工程あるいは乾燥
工程における経済性を考えると、重合時の出発単量体濃
度を高くすることが望ましい。しかし、重合時の単量体
濃度を次第に上げて行、くと、重合体は高粘弾性体含水
ゲルとなり、流体としての取扱いが困難となつてくる。In the aqueous solution polymerization method, it is desirable to increase the starting monomer concentration during polymerization in consideration of economic efficiency in the polymerization step or drying step. However, if the monomer concentration during polymerization is gradually increased, the polymer becomes a hydrogel with high viscoelasticity and becomes difficult to handle as a fluid.
そのためこのような高粘弾性体ゲルを解砕したのち、回
転円筒式乾燥機あるいはベルト式乾燥機などで乾燥し、
然る後に乾燥粒子を粉砕することにより取扱いがｊ 容
易で水に溶解し易い粉末重合体を製造する方法が考えら
れる。しかし、この方法をとる場合に問題になることは
、取扱う重合体含水ゲルの粘着性のために他物質への付
着性および重合体含水ゲル相互間の付着性がいちじるし
く大であることから、重合体含水ゲルの乾燥操作の上で
大きな障害となることである。Therefore, after crushing such a highly viscoelastic gel, it is dried using a rotating cylindrical dryer or a belt dryer.
A possible method is to produce a powdered polymer that is easy to handle and easily dissolves in water by subsequently pulverizing the dry particles. However, when using this method, the problem is that due to the stickiness of the polymer hydrogel to be handled, the adhesion to other substances and the adhesion between polymer hydrogels is extremely large. This is a major hindrance in the drying operation of the combined hydrogel.
このような問題を解決する方法として本発明者らは特開
昭４９−１３５２５３号に記載した如き発明を提案した
が、本発明は上記の発明を更に前進させるべく改良した
ものである。アクリルアミド系重合体含水ゲル（以下単
にゲル）は他物質への付着性およびゲル相互間の付着性
が著しく大きく、前記発明を実施する場合でも当然のこ
とながらこの付着性を低減させることは望ましい。As a method for solving such problems, the present inventors proposed an invention as described in Japanese Patent Application Laid-open No. 135253/1982, but the present invention is an improvement on the above-mentioned invention in order to further advance the invention. Acrylamide-based polymer hydrogels (hereinafter simply referred to as gels) have extremely high adhesion to other substances and between gels, and it is naturally desirable to reduce this adhesion even when carrying out the invention.
特に陰イオン性あるいは非イオン性重合体ゲルに比べ陽
イオン性重合体ゲルの粘着性は大きいので何らかの方法
を講じないかぎり、・前記方法では処理し得ない。In particular, since cationic polymer gels have greater stickiness than anionic or nonionic polymer gels, they cannot be treated with the above methods unless some method is taken.
一般には付着性の大きい物質を取扱う場合、容器につい
て剥離性の良い材質を検討するのは普遍的な技術であり
、通常ポリテトラフルオロエチレンで代表される弗素系
樹脂やポリエチレン、ポリプロピレン等のポリオレフイ
ンが多く用いられている。In general, when handling highly adhesive substances, it is a universal technique to consider materials with good releasability for containers, and fluorine-based resins such as polytetrafluoroethylene and polyolefins such as polyethylene and polypropylene are usually used. It is often used.
そして一般にはこれら剥離性の大きい材質を使用すると
同時に更に適宜離型剤を塗布することも行なわれている
。しかし前記した剥離性の大きい材質を使用した場合お
よび、または離型剤を使用する場合には次のような欠点
が現れる。In addition to using these highly releasable materials, it is also common practice to apply a release agent as needed. However, when the above-mentioned material with high releasability is used and/or when a mold release agent is used, the following drawbacks appear.
即ち剥離性の大きい材質は、機械的強度が低く工業的規
模における過酷な条件下での長時間運転に対してはその
耐久性は予想外に短かい。That is, materials with high peelability have low mechanical strength and have unexpectedly short durability when operated for long periods of time under harsh conditions on an industrial scale.
また離型剤を使用することについては、限られた要求に
対しては満足な結果が得られるが、離形剤の耐久性は一
般に非粘着性物質に比してより短かく、しばしば塗布作
業を要し、その作業中は運転を停止することが必要とな
り、その作業労力は無視できない。The use of mold release agents can also provide satisfactory results for limited requirements, but the durability of mold release agents is generally shorter than that of non-adhesive materials, and the application process is often During the work, it is necessary to stop the operation, and the labor involved cannot be ignored.
本発明者らはこのような特に粘着性の極めて大きい陽イ
オン性含水重合体ゲルの粘着性を軽減することについて
検討を加え、この種重合体ゲルの製造時その重合系内に
ポリエチレングリコールを存在させておくことにより目
的を達成するに至つたが、その後も検討を加えた結果、
重合後の含水ゲル表面をポリエチレングリコールで被覆
することによつても粘着性を著るしく軽減し得ることを
知り本発明に到達した。The present inventors have investigated ways to reduce the stickiness of such extremely sticky cationic water-containing polymer gels, and have found that polyethylene glycol is present in the polymerization system during the production of this type of polymer gel. By leaving them alone, we were able to achieve our goal, but after further consideration, we found that
The present invention was achieved based on the finding that tackiness can be significantly reduced by coating the surface of a hydrogel after polymerization with polyethylene glycol.
即ち、本発明はアクリルアミド系重合体含水ゲル表面を
濃度約４重量％以上の水溶液状のポリエチレングリコー
ルで被覆することを特徴とするアクリルアミド系重合体
含水ゲルの粘着防止法に関するものである。That is, the present invention relates to a method for preventing adhesion of an acrylamide polymer hydrogel, which is characterized by coating the surface of the acrylamide polymer hydrogel with an aqueous polyethylene glycol having a concentration of about 4% by weight or more.
本発明の対象となるゲルは流動性が殆んどなく、ある程
度のかたさを持つ必要がある。The gel targeted by the present invention has almost no fluidity and needs to have a certain degree of hardness.
重合時の出発単量体濃度が低過ぎるとゲルが軟かくなり
、ゲルの処理は取扱い困難となる。例えば平均分子量約
８００万のアクリルアミド重合体の場合は出発単量体濃
度の下限は約１８％（重量）程度である。本発明の対象
となるアクリルアミド系重合体としては、ポリアクリル
アミド、ポリアクリルアミド部分加水分解物、あるいは
アクリルアミドと他のビニル単量体との水溶性共重合体
などである。アクリアミドとの共重合単量体として使用
され得る単量体としては、ジメチルアミノエチルアクリ
レート、ジメチルアミノエチルメタクリレート、ジエチ
ルアミノエチルアクリレート、ジエチルアミノエチルメ
タクリレート、ジメチルアミノヒドロキシプロピルアク
リレート、ジメチルアミノヒドロキシプロピルメタクリ
レート、ジメチルアミノエチルアクリルアミド等の陽イ
オン性ビニル単量体、前記陽イオン性ビニル単量体をア
ルキルハライド、ジアルキル硫酸などの四級化剤で第四
級アンモニウム塩にした陽イオン性ビニル単量体、アク
リロニトリル、メ々クリロニトリル、メチルアクリレー
ト、エチルアクリレート、メタクリルアミドなどの非イ
オン性単量体、アクリル酸、メタクリル酸あるいはそれ
らの塩などの陰イオン性単量体などがある。これらの単
量体を重合するにあたつては、単量体の濃度は１８〜３
０％、好ましくは２０〜２５％で行なう。If the starting monomer concentration during polymerization is too low, the gel will become soft and difficult to handle. For example, in the case of an acrylamide polymer having an average molecular weight of about 8 million, the lower limit of the starting monomer concentration is about 18% (by weight). Acrylamide-based polymers to which the present invention is applied include polyacrylamide, partially hydrolyzed polyacrylamide, and water-soluble copolymers of acrylamide and other vinyl monomers. Monomers that can be used as comonomers with acrylamide include dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl acrylate, diethylaminoethyl methacrylate, dimethylaminohydroxypropyl acrylate, dimethylaminohydroxypropyl methacrylate, dimethylamino Cationic vinyl monomers such as ethyl acrylamide, cationic vinyl monomers obtained by converting the cationic vinyl monomers into quaternary ammonium salts using quaternizing agents such as alkyl halides and dialkyl sulfates, acrylonitrile, Examples include nonionic monomers such as methacrylonitrile, methyl acrylate, ethyl acrylate, and methacrylamide, and anionic monomers such as acrylic acid, methacrylic acid, or salts thereof. When polymerizing these monomers, the concentration of the monomers should be 18 to 3.
0%, preferably 20-25%.
しかしこの範囲は単量体の組成、重合体の分子量によつ
てもゲルの硬度が変るので厳密な意味での臨界的な範囲
ではない。本発明に従つてポリエチレングリコールをア
クリルアミド系重合体の含水ゲルに被覆する方法として
は、ポリエチレングリコールの粉末をそのまま含水ゲル
にふりかけても良いし、あるいは必要に応じて水溶液の
形にしたのち、スプレーするなどの方法を採つても良い
。However, this range is not a critical range in the strict sense because the hardness of the gel changes depending on the monomer composition and the molecular weight of the polymer. According to the present invention, polyethylene glycol can be coated on a hydrous gel of an acrylamide polymer by sprinkling the polyethylene glycol powder directly onto the hydrogel, or if necessary, forming it into an aqueous solution and then spraying it. You may also adopt a method such as
ポリエチレングリコ一ルを粉末状で用いた場合でもそれ
が含水ゲルに接触すると直ちに含水ゲル中より水分を吸
収溶解し、ポリエチレングリコールの水溶液の形で含水
ゲルの表面をおおうことになるので本質的な作用機構は
水溶液状で添加した場合と同じ結果となる。驚くべきこ
とにはある濃度以上（具体的には約４重量％以上）のポ
リエチレングリコール水溶液はアクリルアミド系重合体
を全く溶解させないことが実験結果から明らかとなり、
そのことから含水グルの表面をポリエチレングリコール
水溶液がおおうと、該水溶液は完全な分離層の形で併存
し従つて含水ゲルの粘着性が表面に表れないで本発明の
目的を達成しているものと考えられる。本発明で使用さ
れる添加剤であるポリエチレングリコールの平均分子量
は３００〜１，０００，０００１望ましくは１，０００
〜２０，０００が適している。平均分子量３００〜１，
０００程度の比較的低分子量のポリエチレングリコール
を添加した場合、無添加の場合に比べある程度の改良効
果を示すが、平均分子量１，０００〜２０，０００のも
のを添加した場合に最もいちじるしい効果を発揮するの
で好ましい。一方、平均分子量約１，０００，０００の
超高分子量のポリエチレングリコール（ポリエチレンオ
キサイド）の使用を試みた結果、粘着性軽減の効果は平
均分子量１，０００以下の低分子量ポリエチレングリコ
ールと同程度であるが、このような超高分子量のポリエ
チレングリコールは水に溶解した場合に粘性が極端に大
きくなり、重合体ゲルに分散しにくく、またこれを粉末
状で添加使用した場合も吸水溶解速度が遅いため分散し
にくい欠点がある。本発明におけるポリエチレングリコ
ールの添加量としては、重合体ゲルに０．０２〜１０％
、望ましくは０．１〜５％添加するのがよい。Even when polyethylene glycol is used in powder form, when it comes into contact with a hydrogel, it immediately absorbs and dissolves water from within the hydrogel, covering the surface of the hydrogel in the form of an aqueous solution of polyethylene glycol. The mechanism of action is the same as when added in the form of an aqueous solution. Surprisingly, experimental results have revealed that an aqueous polyethylene glycol solution with a concentration above a certain level (specifically, about 4% by weight or above) does not dissolve acrylamide-based polymers at all.
Therefore, when the surface of the water-containing gel is covered with a polyethylene glycol aqueous solution, the aqueous solution coexists in the form of a completely separated layer, and therefore the adhesiveness of the water-containing gel does not appear on the surface, achieving the object of the present invention. it is conceivable that. The average molecular weight of polyethylene glycol, which is an additive used in the present invention, is 300 to 1,000,0001, preferably 1,000.
~20,000 is suitable. Average molecular weight 300-1,
When polyethylene glycol with a relatively low molecular weight of about 0.000 is added, it shows some improvement effect compared to the case without addition, but the most significant effect is exhibited when polyethylene glycol with an average molecular weight of 1,000 to 20,000 is added. Therefore, it is preferable. On the other hand, as a result of trying to use ultra-high molecular weight polyethylene glycol (polyethylene oxide) with an average molecular weight of approximately 1,000,000, the effect of reducing tackiness was comparable to that of low molecular weight polyethylene glycol with an average molecular weight of 1,000 or less. However, when such ultra-high molecular weight polyethylene glycol is dissolved in water, its viscosity becomes extremely high, making it difficult to disperse into polymer gels, and even when it is added in powder form, the rate of water absorption and dissolution is slow. It has the disadvantage of being difficult to disperse. The amount of polyethylene glycol added in the present invention is 0.02 to 10% to the polymer gel.
, preferably 0.1 to 5%.
陰イオン性重合体、非イオン性重合体、あるいは陽イオ
ン性単量体の共重合比が２０重量％程度以下の弱陽イオ
ン性共重合体に対しては、比較的低いポリエチレングリ
コールの添加量、すなわち単量体溶液に対し０．２％以
下でも充分にその効果を発揮するが、陽イオン性単量体
の共重合比が高い中〜強陽イオン性共重合体では粘着性
がより高くなるため、ポリエチレングリコールの低添加
量ではまだ工程上問題になる程度の粘着性が残るが、含
水ゲルに対し０．５〜５％程度添加することにより良好
な作業性となる迄に粘着性が軽減する。For anionic polymers, nonionic polymers, or weak cationic copolymers with a copolymerization ratio of cationic monomers of about 20% by weight or less, a relatively low amount of polyethylene glycol should be added. In other words, it is sufficiently effective even at 0.2% or less in the monomer solution, but medium to strong cationic copolymers with a high copolymerization ratio of cationic monomers have higher tackiness. Therefore, if the amount of polyethylene glycol added is low, the stickiness will still be a problem in the process, but by adding about 0.5 to 5% to the hydrogel, the stickiness can be reduced to the point where good workability is achieved. Reduce.
それ故、本発明においてポリエチレングリコールの添加
量はアクリルアミド系重合体ゲルの組成によつて適当な
添加量を定めるのが妥当である。このようにして粘着性
の改良されたアクリルアミド系重合体の含水ゲルは、例
えば前述の特開昭４９−１３５２５３号記載の方法によ
り乾燥粉末とすることもできるし、また場合によつては
含水ゲル小塊のまま出荷しても、ゲル小塊が互いに粘着
しないので、使用場面でそのまま水溶液を調整すること
ができる。以上述べたように、本発明は陽イオン性、非
イオン性、あるいは陰イオン性のアクリルアミド系重合
体の含水ゲルの操作性を改善するために極めて有効な方
法である。Therefore, in the present invention, it is appropriate to determine the appropriate amount of polyethylene glycol to be added depending on the composition of the acrylamide polymer gel. The hydrogel of the acrylamide polymer whose adhesiveness has been improved in this way can be made into a dry powder, for example, by the method described in JP-A-49-135253, or in some cases, it can be made into a hydrogel. Even if the gel pellets are shipped as small lumps, the gel pellets do not stick to each other, so an aqueous solution can be prepared as is at the point of use. As described above, the present invention is an extremely effective method for improving the operability of hydrogels of cationic, nonionic, or anionic acrylamide polymers.
以下に示す参考例１および２は本発明の作用機構を説明
するための実験結果である。Reference Examples 1 and 2 shown below are experimental results for explaining the mechanism of action of the present invention.
更に本発明の効果を実施例、参考例により示すが、本発
明はこれにより制限されるものではない。Further, the effects of the present invention will be illustrated by Examples and Reference Examples, but the present invention is not limited thereto.
実施例 １１０ｔのステンレス製重合容器を使用し、ア
クリルアミド１．３２Ｋｆを含む水溶液６Ｋｆを、窒素
パージにより脱酸素を行なつた後、３０℃で２，２′ア
ゾビス−２−アミジノプロパンハイドロクロライド１．
２９を加え、断熱重合を行なつた。Example Using a 110 t stainless steel polymerization vessel, 6 Kf of an aqueous solution containing 1.32 Kf of acrylamide was deoxidized by nitrogen purge, and then 2,2'azobis-2-amidinopropane hydrochloride 1.
29 was added to carry out adiabatic polymerization.
得られたゲルを、孔径３．２ｍｍの多孔板と内部カツタ
一を有する小型の押出解砕機で解砕し、紐状ゲルの集積
体を作り、１即ずつをポリエチレン製袋に入れ、下表に
示した種々のポリエチレングリコール（分子量約６，０
００）を粉体のまま、まぶした。袋に入れたまま、紐状
ゲル集積体を一週間放置した後の、ゲルの相互付着性は
下記の如くであつた。The obtained gel was crushed using a small extrusion crusher equipped with a perforated plate with a hole diameter of 3.2 mm and an internal cutter to form an aggregate of string-like gel, and each piece was placed in a polyethylene bag, and the following table was prepared. Various polyethylene glycols (molecular weight approximately 6,0
00) was sprinkled as a powder. After the string-like gel aggregate was left in the bag for one week, the mutual adhesion of the gels was as shown below.
参考例 １
実施例１と同一の重合条件により得た分子量約８００万
、ポリマー濃度２２％の非イオン性ポリアクリルアミド
含水ゲルの集積体１０９を下記の２種の液に浸漬し２４
時間後の状態を観察した。Reference Example 1 An aggregate 109 of nonionic polyacrylamide hydrogel with a molecular weight of about 8 million and a polymer concentration of 22% obtained under the same polymerization conditions as in Example 1 was immersed in the following two types of solutions.
The condition was observed after a period of time.
１平均分子量約６０００のポリエチ
レングリコール５％水溶液 ２０１２水
２０ＣＣ
１では若干の膨潤が起つていたが含水ゲル相と液相とが
完全に分離しており、液相部分を組成分析したが、ポリ
アクリルアミドを殆んど含んでいないポリエチレングリ
コール水溶液であつた。1 5% aqueous solution of polyethylene glycol with an average molecular weight of about 6000 2012 water
Although some swelling occurred in 20CC 1, the hydrous gel phase and liquid phase were completely separated, and the composition of the liquid phase was analyzed, but it was found to be a polyethylene glycol aqueous solution containing almost no polyacrylamide. Ta.
一方２ではゲルが水を完全に吸収した形で膨潤して全体
が一体となり粘着性の大きい柔らかいゲルとなつた。参
考例 ２
５重量％のジメチルアミノエチルメタクリレートを含む
アクリルアミド系重合体とポリエチレングリコール（平
均分子量６０００）及び水の３成分系相平衡についての
２４時間後の状態を観察し次表の結果を得た。On the other hand, in case 2, the gel completely absorbed water and swelled, and the whole gel became one, forming a soft gel with high stickiness. Reference Example 2 The state of the three-component phase equilibrium of an acrylamide polymer containing 5% by weight of dimethylaminoethyl methacrylate, polyethylene glycol (average molecular weight 6000), and water after 24 hours was observed, and the results shown in the following table were obtained. .
実施例 ２
１００ｔのステンレス容器を用い、アクリルアミド１７
．５Ｋｆ１ジメチルアミノエチルアクリレート０．９２
鞭を含む水溶液８０Ｋｆを、窒素パージにより脱酸素し
た後、２８℃において２，２′−アゾビス−２−アミジ
ノプロパンハイドロクロライド８９を加え、断熱状態で
重合を行なつた。Example 2 Using a 100t stainless steel container, acrylamide 17
．． 5Kf1 dimethylaminoethyl acrylate 0.92
After deoxidizing the aqueous solution containing 80 Kf with nitrogen purge, 89 g of 2,2'-azobis-2-amidinopropane hydrochloride was added at 28 DEG C., and polymerization was carried out under adiabatic conditions.
得られた重合ゲルを実施例１と同様に押出解砕機を用い
てゲル集積体を得た。これをステンレス金網の上に拡げ
、下表に示す濃度のポリエチレングリコール（分子量約
６０００）水溶液をスプレーガンにより、ゲル集積体重
量当り２重量％撒布した。The obtained polymer gel was used in the same manner as in Example 1 to obtain a gel aggregate using an extrusion crusher. This was spread on a stainless steel wire mesh, and an aqueous solution of polyethylene glycol (molecular weight: about 6000) having the concentration shown in the table below was sprayed with a spray gun in an amount of 2% by weight based on the weight of the gel.
このようにして得たゲル集積体各４０Ｋｆを、直径４７
０鰭、巾５６０１１ｍの回転円筒型熱風乾燥機に供給し
て、乾燥を行なつた。乾燥条件は乾燥ドラム回転数４．
５ｒｐｍ１熱風入口速度０．６ｍ／秒、熱風温度６０℃
、乾燥時間３００分とした。その結果は次表の通りであ
つた。実施例 ３実施例２と同一の重合条件により得ら
れた重合ゲルを、実施例１に示した押出解砕機により解
砕する際、解砕機のゲル投入部にパイプにより、下表に
示した種々の平均分子量のポリエチレングリコールの１
０％水溶液を、ポリエチレングリコール量が含水重合ゲ
ルに対して０．２％になるように供給し、解砕機内部で
含水重合ゲルとポリエチレングリコール水溶液を混合し
た。Each 40 Kf gel aggregate thus obtained was
It was supplied to a rotating cylindrical hot air dryer with 0 fins and a width of 56,011 m for drying. Drying conditions are drying drum rotation speed 4.
5rpm1 Hot air inlet speed 0.6m/sec, hot air temperature 60℃
, the drying time was 300 minutes. The results were as shown in the table below. Example 3 When the polymerized gel obtained under the same polymerization conditions as in Example 2 was crushed using the extrusion crusher shown in Example 1, the various types shown in the table below were inserted into the gel input part of the crusher through a pipe. 1 of polyethylene glycol with an average molecular weight of
A 0% aqueous solution was supplied so that the amount of polyethylene glycol was 0.2% with respect to the water-containing polymer gel, and the water-containing polymer gel and the polyethylene glycol aqueous solution were mixed inside the crusher.
得られた解砕ゲルは、実施例２に示した回転円筒型熱風
乾燥機を用いて乾燥を行なつた。The obtained crushed gel was dried using the rotating cylindrical hot air dryer shown in Example 2.
Claims (1)
量％以上の水溶液状のポリエチレングリコールで被覆す
ることを特徴とするアクリルアミド系重合体含水ゲルの
粘着防止法。 ２ アクリルアミド系重合体が約１８〜３０重量％の濃
度の含水ゲルであることを特徴とする特許請求の範囲第
１項記載の方法。 ３ 被覆するポリエチレングリコールの平均分子量が３
００〜１，０００，０００好ましくは１，０００〜２０
，０００のものを用いる特許請求の範囲第１項記載の方
法。 ４ アクリルアミド系重合体含水ゲルに対し０．０２〜
１０重量％好ましくは０．１〜５重量％のポリエチレン
グリコールを使用する特許請求の範囲第１項記載の方法
。 ５ ポリエチレングリコールをアクリルアミド系重合体
含水ゲルの塊またはこれを解砕して得た相互付着粒子群
に添加し被覆する特許請求範囲第１項記載の方法。[Scope of Claims] 1. A method for preventing adhesion of an acrylamide polymer hydrogel, which comprises coating the surface of the acrylamide polymer hydrogel with an aqueous polyethylene glycol having a concentration of about 4% by weight or more. 2. The method according to claim 1, wherein the acrylamide polymer is a hydrogel having a concentration of about 18 to 30% by weight. 3 The average molecular weight of the polyethylene glycol to be coated is 3
00-1,000,000 preferably 1,000-20
.,000 method according to claim 1. 4 0.02 to acrylamide polymer hydrogel
2. Process according to claim 1, characterized in that 10% by weight of polyethylene glycol is used, preferably from 0.1 to 5% by weight. 5. The method according to claim 1, wherein polyethylene glycol is added to and coated a lump of acrylamide-based polymer hydrogel or a group of mutually adhered particles obtained by crushing the same.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15084776A JPS5910694B2 (en) | 1976-12-17 | 1976-12-17 | Method for preventing adhesion of acrylamide polymer hydrogel |
| FR7700389A FR2337738A1 (en) | 1976-01-09 | 1977-01-07 | PROCESS FOR REDUCING THE ADHESIVITY OF A HYDROGEL OF A HYDROSOLUBLE ACRYLAMIDE POLYMER OR COPOLYMER |
| DE2700575A DE2700575C3 (en) | 1976-01-09 | 1977-01-07 | Process for the preparation of hydrogels of water-soluble polymers or copolymers of acrylamide with reduced stickiness |
| US05/758,275 US4134871A (en) | 1976-01-09 | 1977-01-10 | Method for reducing the adhesiveness of hydrogel-like polymer by adding polyethylene glycol |
| GB29363/77A GB1572219A (en) | 1976-01-09 | 1977-07-13 | Acrylamide polymer hydrogels of reduced adhesiveness and their production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15084776A JPS5910694B2 (en) | 1976-12-17 | 1976-12-17 | Method for preventing adhesion of acrylamide polymer hydrogel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5381555A JPS5381555A (en) | 1978-07-19 |
| JPS5910694B2 true JPS5910694B2 (en) | 1984-03-10 |
Family
ID=15505668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15084776A Expired JPS5910694B2 (en) | 1976-01-09 | 1976-12-17 | Method for preventing adhesion of acrylamide polymer hydrogel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5910694B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2530647A1 (en) * | 1982-07-20 | 1984-01-27 | Rhone Poulenc Spec Chim | PROCESS FOR THE PREPARATION OF WATER-SOLUBLE ACRYLIC POLYMER FLAKES |
| JPH0788456B2 (en) * | 1986-07-23 | 1995-09-27 | 三井サイテック株式会社 | Method for producing water-soluble polymer composition |
| JP5935601B2 (en) * | 2012-08-30 | 2016-06-15 | 三菱レイヨン株式会社 | Method for producing water-soluble polymer |
| WO2014208604A1 (en) * | 2013-06-27 | 2014-12-31 | 国立大学法人大阪大学 | High-strength gel relying on intramolecular interaction |
-
1976
- 1976-12-17 JP JP15084776A patent/JPS5910694B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5381555A (en) | 1978-07-19 |
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