JP2007014934A - Treatment method of water-based flexographic ink waste liquid - Google Patents
Treatment method of water-based flexographic ink waste liquid Download PDFInfo
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Abstract
【課題】水性フレキソインキの廃液処理時に強酸や強塩基などの危険な薬剤を使用せず、また、処理廃液のｐＨの管理が不要であり、従って作業性が改善され効率的な水性フレキソインキの廃液処理方法を提供すること。
【解決手段】水性フレキソインキを構成している樹脂分を含む廃液に、ｐＨが４〜５である処理剤水溶液を添加し、上記樹脂分を析出させ、さらに高分子凝集剤にて凝集塊を分離することを特徴とする水性フレキソインキの廃液の処理方法。
【選択図】なし[PROBLEMS] To avoid the use of dangerous chemicals such as strong acids and strong bases during the treatment of aqueous flexo ink waste liquid, and to eliminate the need for pH control of the treatment waste liquid. To provide a waste liquid treatment method.
A processing agent aqueous solution having a pH of 4 to 5 is added to a waste liquid containing a resin component constituting an aqueous flexographic ink, the resin component is precipitated, and agglomerates are formed with a polymer flocculant. A method for treating a waste liquid of a water-based flexographic ink characterized by separating.
[Selection figure] None
Description
本発明は、水性フレキソインキ廃液の処理方法に関し、さらに詳しくは薬剤の取扱時の危険性が少なく、処理廃液のｐＨ調整作業が不要な水性フレキソインキ廃液の処理方法に関する。 The present invention relates to a method for treating aqueous flexographic ink waste liquor, and more particularly to a method for treating aqueous flexographic ink waste liquor that has little risk of handling chemicals and does not require pH adjustment of the treatment waste liquor.
従来、有機揮発成分を減少させるため、印刷インキの水性化が進められており、その結果、各種印刷において水性フレキソインキの使用量が増加している。このような水性フレキソインキは皮膜形成剤である水溶性樹脂などの水溶液中に顔料を分散させた構成である。 Conventionally, in order to reduce organic volatile components, water-based printing inks have been promoted, and as a result, the amount of water-based flexographic ink used in various printings has increased. Such a water-based flexographic ink has a configuration in which a pigment is dispersed in an aqueous solution such as a water-soluble resin that is a film forming agent.
上記水性フレキソインキの製造に際しては、顔料のビヒクル中への分散時、同一装置における水性フレキソインキの色替え時、その他多くの場合に分散機、攪拌機、分散槽、撹拌槽、計量装置、インキ容器、容器への充填装置などの種々の装置の洗浄が行なわれているが、これらの洗浄は水洗が可能であるという利点がある。また、上記水性フレキソインキを用いて印刷を行なう場合においても、各種印刷機および付属機器の洗浄も水洗が可能であるという利点がある。 In the production of the above-mentioned aqueous flexo ink, when dispersing the pigment in the vehicle, when changing the color of the aqueous flexo ink in the same apparatus, and in many cases, the disperser, the agitator, the dispersion tank, the agitation tank, the metering device, the ink container Various devices such as a filling device for containers have been cleaned. These cleanings have an advantage that they can be washed with water. Further, even when printing is performed using the water-based flexographic ink, there is an advantage that washing of various printing machines and attached devices can be performed with water.
上記の如き水性フレキソインキは、多くの利点を有する一方で、インキ中の水溶性樹脂および顔料が洗浄廃液中に混入し、該廃液をそのまま放流できないことから、廃液中の水溶性樹脂および顔料を廃液から分離除去することが必要である。水性フレキソインキの廃液処理としては以下の如き方法が行なわれている。 While the water-based flexographic ink as described above has many advantages, the water-soluble resin and pigment in the ink are mixed in the washing waste liquid, and the waste liquid cannot be discharged as it is. It is necessary to separate and remove from the waste liquid. As a waste liquid treatment of water-based flexographic ink, the following method is performed.
水性フレキソインキの廃液は、通常約１質量％程度の濃度でスチレン・アクリル酸系共重合体、アクリル酸系重合体、スチレン・マレイン酸系共重合体などの樹脂および顔料を含んでおり、そのｐＨは８前後のアルカリ性である。この廃液に塩酸や硫酸などの強酸を添加して廃液のｐＨを４前後とし、溶解している樹脂を不溶化析出させ、次いで苛性ソーダなどの強塩基で中和して廃液基準に適合するようにｐＨを約６にした後、高分子凝集剤の水溶液を加えて析出した樹脂を巨大なフロックに凝集させ、凝集物をフィルタープレスなどで分離し、濾液を放流する。 The waste liquid of water-based flexographic ink usually contains a resin and pigment such as styrene / acrylic acid copolymer, acrylic acid polymer, styrene / maleic acid copolymer at a concentration of about 1% by mass. The pH is alkaline around 8. A strong acid such as hydrochloric acid or sulfuric acid is added to the waste liquid to bring the pH of the waste liquid to around 4, and the dissolved resin is insolubilized and precipitated, and then neutralized with a strong base such as caustic soda to meet the waste liquid standard. Then, an aqueous solution of a polymer flocculant is added to agglomerate the precipitated resin into a huge floc, the aggregate is separated with a filter press or the like, and the filtrate is discharged.
上記従来の水性フレキソインキの廃液処理においては、強酸および強塩基を使用することから、その取扱に危険性がある。また、強酸、強塩基、凝集剤の添加時、凝集物の除去時、さらには放流時において常に廃液のｐＨを各種方法により確認せねばならないなどの煩雑性がある。 In the conventional waste liquid treatment of aqueous flexographic ink, since a strong acid and a strong base are used, there is a risk in handling. In addition, there is a complication such that the pH of the waste liquid must always be confirmed by various methods when a strong acid, a strong base, and a flocculant are added, when the agglomerate is removed, and when discharged.
従って本発明の目的は、水性フレキソインキの廃液処理時に強酸や強塩基などの危険な薬剤を使用せず、また、処理廃液のｐＨの管理が不要であり、従って作業性が改善され、効率的な水性フレキソインキの廃液処理方法を提供することである。 Therefore, the object of the present invention is to avoid the use of dangerous chemicals such as strong acids and strong bases during the treatment of aqueous flexo ink waste liquid, and it is not necessary to control the pH of the treatment waste liquid. It is to provide a method for treating a waste liquid of a water-based flexographic ink.
上記の目的は以下の本発明によって達成される。すなわち、本発明は、水性フレキソインキを構成している樹脂分を含む廃液に、ｐＨが４〜５である処理剤水溶液を添加し、上記樹脂分を析出させ、さらに高分子凝集剤にて凝集塊を分離することを特徴とする水性フレキソインキの廃液の処理方法を提供する。 The above object is achieved by the present invention described below. That is, the present invention adds a treatment agent aqueous solution having a pH of 4 to 5 to a waste liquid containing a resin component constituting an aqueous flexographic ink, precipitates the resin component, and further aggregates with a polymer flocculant. Disclosed is a method for treating a waste liquid of an aqueous flexographic ink characterized by separating lumps.
上記本発明においては、前記廃液中の樹脂が、スチレン・アクリル酸系共重合体、アクリル酸系重合体、スチレン・マレイン酸系共重合体などの樹脂であり、該樹脂の濃度が０．１〜４質量％であること；前記処理剤水溶液の有効成分が、強カチオン性ジシアンジアミド重縮合物であり、該有効成分の濃度が１０〜７０質量％であること；および前記処理前の廃液のｐＨが、７〜９であり、処理後の廃液のｐＨが６〜８であることが好ましい。 In the present invention, the resin in the waste liquid is a resin such as a styrene / acrylic acid copolymer, an acrylic acid polymer, a styrene / maleic acid copolymer, and the concentration of the resin is 0.1. The active ingredient of the aqueous treatment agent solution is a strong cationic dicyandiamide polycondensate, and the concentration of the active ingredient is 10 to 70% by mass; and the pH of the waste liquid before the treatment However, it is 7-9, and it is preferable that the pH of the waste liquid after a process is 6-8.
上記本発明によれば、水性フレキソインキの廃液処理時に強酸や強塩基などの危険な薬剤を使用せず、また、処理廃液のｐＨの管理が不要であり、従って作業性が改善され、効率的な水性フレキソインキの廃液処理方法を提供することができる。 According to the present invention, no dangerous chemicals such as strong acids and strong bases are used during the treatment of the aqueous flexo ink waste liquid, and the pH of the treatment waste liquid is not required to be controlled. It is possible to provide a wastewater treatment method for a water-based flexographic ink.
次に好ましい実施の形態を挙げて本発明を詳細に説明する。
本発明の方法が適用される廃液は、水性フレキソインキの廃液であり、該廃液は水性フレキソインキの製造場所および使用場所である印刷工場において多量に発生する。
Next, the present invention will be described in detail with reference to preferred embodiments.
The waste liquid to which the method of the present invention is applied is a water-based flexographic ink waste liquid, and the waste liquid is generated in a large amount at a printing factory where the water-based flexographic ink is manufactured and used.
本発明でいう水性フレキソインキは次のように製造および使用されている。先ず、有機または無機顔料を、スチレン・アクリル共重合体酸、アクリル酸系重合体、スチレン・マレイン酸系共重合などの樹脂水溶液に混合し、必要な添加剤を加え、これをビーズミルに通すことで顔料を細分散し、顔料分散ベース（顔料分約４０〜７０質量％）とする。 The water-based flexographic ink referred to in the present invention is produced and used as follows. First, an organic or inorganic pigment is mixed with an aqueous resin solution such as styrene / acrylic copolymer acid, acrylic acid polymer, styrene / maleic acid copolymer, and the necessary additives are added, and this is passed through a bead mill. To finely disperse the pigment to obtain a pigment dispersion base (pigment content of about 40 to 70% by mass).
上記顔料分散ベースをスチレン・アクリル酸系共重合体、アクリル酸系重合体、スチレン・マレイン酸系共重合体などの樹脂水溶液またはこれらの樹脂エマルジョンにて約２倍程度に希釈し、さらに少量の耐摩剤、消泡剤などの添加剤を加えインキベースとする。 The pigment-dispersed base is diluted about twice with a resin aqueous solution such as styrene / acrylic acid copolymer, acrylic acid polymer, styrene / maleic acid copolymer, or a resin emulsion thereof. Add additives such as anti-wear and anti-foaming agents to make the ink base.
上記インキベースには紅、赤、橙、黄、草、藍、紫、白、墨などの十数種類の色相の顔料を使用したものがあり、要求された色相となるように種々の比率で混合することにより製造されたものである。 Some of the above ink bases use pigments with more than ten kinds of hues such as red, red, orange, yellow, grass, indigo, purple, white, black, etc., and are mixed at various ratios to obtain the required hue It is manufactured by doing.
以上のように製造された水性フレキソインキは、段ボールケースの印刷に主に用いられる。この印刷は、フレキシブルな凸版を使用することからフレキソ印刷方式と呼ばれ、表面に小さなピラミッド状または半球状の凹みがつけられたアニロックスロールから、一定膜厚のインキを凸版上に供給しながら高速印刷される。インキが非常に速乾性のインキである場合には、該インキを皮張りを防止するためリザーブタンクとインキング装置の間で絶えず循環されている。 The water-based flexographic ink produced as described above is mainly used for cardboard case printing. This printing is called a flexographic printing method because it uses a flexible relief printing plate, and it supplies high-speed ink while supplying a certain thickness of ink onto the relief printing plate from an anilox roll with a small pyramid or hemispherical dent on the surface. Printed. If the ink is a very fast drying ink, the ink is constantly circulated between the reserve tank and the inking device to prevent skinning.
また、このインキは水性インキであるため水による希釈が可能であり、使用された版、循環装置、アニロックスロールは通常水で洗浄されている。段ボールケース印刷に際し、指定された色相への色換えが一日に何十回となく行なわれることにより多量の洗浄廃液が発生するのである。 Further, since this ink is a water-based ink, it can be diluted with water, and used plates, circulation devices, and anilox rolls are usually washed with water. When printing on a cardboard case, a large amount of washing waste liquid is generated by changing the color to a designated hue several dozen times a day.
上記水性フレキソインキの製造および使用時に発生する洗浄廃液は、前記樹脂分を固形分で０．１〜４質量％、主に約１質量％程度を含有しており、そのｐＨは７〜９である。 The washing waste liquid generated during the production and use of the water-based flexographic ink contains 0.1 to 4% by mass, mainly about 1% by mass of the resin content, and the pH is 7 to 9. is there.
本発明では上記廃液のｐＨを従来技術の如く強酸で調整することなく、ｐＨが４〜５に調整された処理剤水溶液を添加し、空気を吹き込むことにより、均一に混合する。この混合によって廃液中の樹脂が析出する。さらに高分子凝集剤を加えることで、巨大なフロックを形成して廃液から分離する。この時点での廃液のｐＨは６〜８になる。 In the present invention, the aqueous solution of the treatment liquid whose pH is adjusted to 4 to 5 is added without adjusting the pH of the waste liquid with a strong acid as in the prior art, and the mixture is uniformly mixed by blowing air. By this mixing, the resin in the waste liquid is precipitated. Further, by adding a polymer flocculant, a huge floc is formed and separated from the waste liquid. At this time, the pH of the waste liquid becomes 6-8.
上記本発明で溶解している樹脂を析出させるために使用する処理剤水溶液としては、従来染料廃液の脱色剤として使用されている強カチオン性のジシアンジアミド系化合物の水溶液が好ましく使用される。ジシアンジアミド系化合物として、特に好ましい化合物は、ジシアンジアミド１〜２モルとホルムアルデヒド１〜２モルとの重縮合生成物、ジシアンジアミド１〜２モルとポリエチレンポリアミン１〜２モルとの重縮合反応物、ジシアンジアミド１〜２モルとジエチレントリアミン１〜２モルとホルムアルデヒド１〜２モルとの重縮合反応物などが挙げられる。 As the treating agent aqueous solution used for precipitating the resin dissolved in the present invention, an aqueous solution of a strong cationic dicyandiamide compound that has been conventionally used as a decolorizing agent for dye waste liquids is preferably used. Particularly preferred compounds as the dicyandiamide-based compound are polycondensation products of dicyandiamide 1-2 mol and formaldehyde 1-2 mol, polycondensation reaction products of dicyandiamide 1-2 mol and polyethylene polyamine 1-2 mol, dicyandiamide 1- Examples include a polycondensation reaction product of 2 mol, 1 to 2 mol of diethylenetriamine and 1 to 2 mol of formaldehyde.
これらの強カチオン性のジシアンジアミド系化合物は、例えば、有機凝結剤として知られているセンカフロックＺシリーズ（Ｚ−０８Ｃ、１３０Ｃ、１５０Ｃ）として、センカ（株）から市販されているものや、タキフロックＣＬ−５５０Ｋ（多木化学（株）製）や、カヤフロックＬＣ−１５１２（カヤフロック（株）製）などが有用である。 These strong cationic dicyandiamide compounds include those commercially available from Senka Co., Ltd., such as Senkafloc Z series (Z-08C, 130C, 150C) known as organic coagulants, and TAKIFLOK CL. -550K (manufactured by Taki Chemical Co., Ltd.) and Kayafloc LC-1512 (manufactured by Kayafloc Co., Ltd.) are useful.
上記強カチオン性のジシアンジアミド系化合物を水に溶解し、約１０〜７０質量％の濃度の水溶液とし、該水溶液はｐＨが４〜５となり、本発明で使用する処理剤水溶液とする。 The strong cationic dicyandiamide compound is dissolved in water to obtain an aqueous solution having a concentration of about 10 to 70% by mass. The aqueous solution has a pH of 4 to 5, and is used as an aqueous treatment agent used in the present invention.
上記処理剤水溶液は、前記水性フレキソインキの廃液１００質量部あたり約０．０５〜１．０質量部の割合で添加する。処理剤水溶液を添加後空気を吹き込み均一に混合することによって、廃液中に溶解している樹脂が析出する。上記処理剤の添加量は廃液中の樹脂が析出し始めるまでの量とすることが好ましい。 The treatment agent aqueous solution is added at a ratio of about 0.05 to 1.0 part by mass per 100 parts by mass of the waste liquid of the aqueous flexo ink. After adding the aqueous treatment solution, air is blown in and uniformly mixed, so that the resin dissolved in the waste liquid is deposited. The amount of the treatment agent added is preferably an amount until the resin in the waste liquid starts to precipitate.
さらに高分子凝集剤を加えることで巨大なフロックを形成する。ここで使用する高分子凝集剤としては、従来から排水処理等に使用されているアニオン性、ノニオン性、カチオン性、両性の各種高分子凝集剤が使用可能である。具体的には、例えば、タキフロックＡ−１０４（多木化学（株）製）、センカフロックＳ−３０２０Ａ（センカ（株）製）、カヤフロックＡ−１９５（カヤフロック（株）製）などが挙げられる。
高分子凝集剤の使用量は、前記水性フレキソインキの廃液１００質量部あたり、凝集剤の０．１質量％水溶液で約０．１〜５．０質量部の割合であることが好ましい。
Furthermore, a huge floc is formed by adding a polymer flocculant. As the polymer flocculant used here, various anionic, nonionic, cationic and amphoteric polymer flocculants conventionally used for wastewater treatment and the like can be used. Specifically, for example, Takiflock A-104 (manufactured by Taki Chemical Co., Ltd.), Sengaflock S-3020A (manufactured by Sengka Co., Ltd.), Kayaflock A-195 (manufactured by Kayaflock Co., Ltd.) and the like can be mentioned.
The amount of the polymer flocculant used is preferably about 0.1 to 5.0 parts by mass with a 0.1% by mass aqueous solution of the flocculant per 100 parts by mass of the waste liquid of the aqueous flexo ink.
高分子凝集剤により凝集したフロックをフィルタープレスなどの適当な手段で分離することにより、処理された廃液中の樹脂は殆ど除去され、処理廃液のｐＨは約６．５〜７．５程度になっているので、そのまま放流することができる。 By separating the floc aggregated by the polymer flocculant by an appropriate means such as a filter press, the resin in the treated waste liquid is almost removed, and the pH of the treated waste liquid is about 6.5 to 7.5. It can be released as it is.
次に実施例および比較例を挙げて本発明をさらに詳細に説明する。
実施例１
水性フレキソインキの廃液の樹脂濃度は、通常約１質量％であるので、実験的には水性フレキソインキを希釈して樹脂濃度１質量％の水溶液を標準廃液とした。該標準廃液１００ｇ（ｐＨ＝７．７１）に対して処理剤水溶液（商品名：タキフロックＣＬ−５５０Ｋ、多木化学（株）製、固形分５６質量％）を０．３ｇ加えて空気を吹き込むと、水に溶解していた樹脂が析出し、樹脂が懸濁状態となる。このときの廃液のｐＨは７．５１へと若干下がっただけであった。最後に高分子凝集剤（商品名：タキフロックＡ−１０４、多木化学（株）製、固形分０．１質量％）を１．３ｇ投入し、フロックを形成させた後濾過してフロックを水から分離した。フロックを分離した水は殆ど有機物を含んでいなかった。この方法では強酸も強アルカリも使用する必要もなく、各段階でのｐＨの調整も不要であった。
Next, the present invention will be described in more detail with reference to examples and comparative examples.
Example 1
Since the resin concentration of the aqueous flexo ink waste liquid is usually about 1% by mass, the aqueous flexo ink was diluted experimentally to use an aqueous solution having a resin concentration of 1% by mass as the standard waste liquid. When 0.3 g of a processing agent aqueous solution (trade name: Takiflock CL-550K, manufactured by Taki Chemical Co., Ltd., solid content 56 mass%) is added to 100 g (pH = 7.71) of the standard waste liquid, and air is blown into it. Then, the resin dissolved in water is deposited, and the resin is in a suspended state. At this time, the pH of the waste liquid was only slightly lowered to 7.51. Finally, 1.3 g of a polymer flocculant (trade name: Takiflock A-104, manufactured by Taki Chemical Co., Ltd., solid content: 0.1% by mass) was added to form a floc and then filtered to remove the floc. Separated from. The water from which the floc was separated contained little organic matter. This method did not require the use of strong acid or strong alkali, and adjustment of pH at each stage was unnecessary.
実施例２
水性フレキソインキの廃液の樹脂濃度は、通常約１質量％であるので、実験的には水性フレキソインキを希釈して樹脂濃度１質量％の水溶液を標準廃液とした。該標準廃液１００ｇ（ｐＨ＝７．７１）に対して処理剤水溶液（商品名：センカフロックＺ−１５０Ｃ、センカ（株）製、固形分６０質量％）を０．２３ｇを加えて空気を吹き込むと、水に溶解していた樹脂が析出し、樹脂が懸濁状態となる。このときの廃液のｐＨは７．４０へと若干下がっただけであった。最後に高分子凝集剤（商品名：センカフロックＳ−３０２０Ａ、センカ（株）製、固形分０．１質量％）を０．７６ｇ投入し、フロックを形成させた後濾過してフロックを水から分離した。フロックを分離した水は殆ど有機物を含んでいなかった。この方法では強酸も強アルカリも使用する必要もなく、各段階でのｐＨの調整も不要であった。
Example 2
Since the resin concentration of the aqueous flexo ink waste liquid is usually about 1% by mass, the aqueous flexo ink was diluted experimentally to use an aqueous solution having a resin concentration of 1% by mass as the standard waste liquid. When 0.23 g of an aqueous treating agent solution (trade name: Senkaflock Z-150C, manufactured by Senka Co., Ltd., solid content 60% by mass) is added to 100 g of the standard waste liquid (pH = 7.71), and air is blown into it. Then, the resin dissolved in water is deposited, and the resin is in a suspended state. At this time, the pH of the waste liquid was only slightly lowered to 7.40. Finally, 0.76 g of a polymer flocculant (trade name: Senka Flock S-3020A, manufactured by Senka Co., Ltd., solid content: 0.1% by mass) was added to form a floc and filtered to remove the floc from water. separated. The water from which the floc was separated contained little organic matter. In this method, neither strong acid nor strong alkali was required, and adjustment of pH at each stage was unnecessary.
実施例３
水性フレキソインキの廃液の樹脂濃度は、通常約１質量％であるので、実験的には水性フレキソインキを希釈して樹脂濃度１質量％の水溶液を標準廃液とした。該標準廃液１００ｇ（ｐＨ＝７．７１）に対して処理剤水溶液（商品名：カヤフロックＬＣ−１５１２、カヤフロック（株）製、固形分５８質量％）を０．２７ｇを加えて空気を吹き込むと、水に溶解していた樹脂が析出し、樹脂が懸濁状態となる。このときの廃液のｐＨは７．３８へと若干下がっただけであった。最後に高分子凝集剤（商品名：カヤフロックＡ−１９５、カヤフロック（株）製、固形分０．１質量％）を１．０ｇ投入し、フロックを形成させた後濾過してフロックを水から分離した。フロックを分離した水は殆ど有機物を含んでいなかった。この方法では強酸も強アルカリも使用する必要もなく、各段階でのｐＨの調整も不要であった。
Example 3
Since the resin concentration of the aqueous flexo ink waste liquid is usually about 1% by mass, the aqueous flexo ink was diluted experimentally to use an aqueous solution having a resin concentration of 1% by mass as the standard waste liquid. When 0.27 g of an aqueous treatment agent solution (trade name: Kayafloc LC-1512, manufactured by Kayafloc Co., Ltd., solid content: 58% by mass) is added to 100 g of the standard waste liquid (pH = 7.71), and air is blown into it. The resin dissolved in water is deposited, and the resin becomes suspended. At this time, the pH of the waste liquid was only slightly lowered to 7.38. Finally, 1.0 g of a polymer flocculant (trade name: Kayafloc A-195, manufactured by Kayafloc Co., Ltd., solid content: 0.1% by mass) is added to form a floc and then filtered to separate the floc from water. did. The water from which the floc was separated contained little organic matter. In this method, neither strong acid nor strong alkali was required, and adjustment of pH at each stage was unnecessary.
比較例１
実施例１と同じ標準廃液１００ｇ（ｐＨ＝７．７１）に塩化第二鉄水溶液（固形分３８質量％、ｐＨ＝０．５）０．２ｇを加え、ｐＨ≒３とする。これにより、水に溶解していた樹脂が析出し、樹脂の懸濁状態となる。続いて８質量％苛性ソーダ水溶液（ｐＨ＝１４）を０．４ｇ加え、ｐＨ≒６とする。最後に高分子凝集剤溶液（商品名：タキフロックＮ−１００ＴＳ、多木化学（株）製、固形分１質量％）を０．４ｇ投入し、フロックを形成させた後濾過してフロックを水から分離した。フロックを分離した水のｐＨは６．３１であり、殆ど有機物を含んでいなかった。この方法では強酸（塩化第二鉄水溶液）と強アルカリ（苛性ソーダ）の使用が必須であり、各段階でのｐＨの調整も必須であった。
Comparative Example 1
0.2 g of ferric chloride aqueous solution (solid content 38 mass%, pH = 0.5) is added to 100 g (pH = 7.71) of the same standard waste liquid as in Example 1 so that pH≈3. As a result, the resin dissolved in water is deposited, and the resin is suspended. Subsequently, 0.4 g of an 8% by mass aqueous caustic soda solution (pH = 14) is added to obtain pH≈6. Finally, 0.4 g of a polymer flocculant solution (trade name: Takiflock N-100TS, manufactured by Taki Chemical Co., Ltd., solid content: 1% by mass) was added to form a floc and filtered to remove the floc from water. separated. The water from which the floc was separated had a pH of 6.31 and contained almost no organic matter. In this method, it is essential to use a strong acid (aqueous ferric chloride solution) and a strong alkali (caustic soda), and it is also essential to adjust the pH at each stage.
上記本発明によれば、水性フレキソインキの廃液処理時に強酸や強塩基などの危険な薬剤を使用せず、また、処理廃液のｐＨの管理が不要であり、従って作業性が改善され、効率的な水性フレキソインキの廃液処理方法を提供することができる。
According to the present invention, no dangerous chemicals such as strong acids and strong bases are used during the treatment of the aqueous flexo ink waste liquid, and the pH of the treatment waste liquid is not required to be controlled. It is possible to provide a wastewater treatment method for a water-based flexographic ink.
Claims (4)
The waste liquid treatment method according to claim 1, wherein the pH of the waste liquid before the treatment is 7 to 9, and the pH of the waste liquid after the treatment is 6 to 8.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49134164A (en) * | 1973-04-26 | 1974-12-24 | ||
| JPS6342706A (en) * | 1986-08-06 | 1988-02-23 | Kurita Water Ind Ltd | Treatment of water containing water-based paint |
| JP2005007246A (en) * | 2003-06-17 | 2005-01-13 | Sinto Brator Co Ltd | Treatment method for organic waste water |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49134164A (en) * | 1973-04-26 | 1974-12-24 | ||
| JPS6342706A (en) * | 1986-08-06 | 1988-02-23 | Kurita Water Ind Ltd | Treatment of water containing water-based paint |
| JP2005007246A (en) * | 2003-06-17 | 2005-01-13 | Sinto Brator Co Ltd | Treatment method for organic waste water |
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