JP6341895B2 - Aqueous cleaning liquid and cleaning method using the same - Google Patents
Aqueous cleaning liquid and cleaning method using the same Download PDFInfo
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- JP6341895B2 JP6341895B2 JP2015183669A JP2015183669A JP6341895B2 JP 6341895 B2 JP6341895 B2 JP 6341895B2 JP 2015183669 A JP2015183669 A JP 2015183669A JP 2015183669 A JP2015183669 A JP 2015183669A JP 6341895 B2 JP6341895 B2 JP 6341895B2
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- 238000004140 cleaning Methods 0.000 title claims description 104
- 239000007788 liquid Substances 0.000 title claims description 93
- 238000000034 method Methods 0.000 title claims description 24
- 239000003973 paint Substances 0.000 claims description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 64
- 239000002351 wastewater Substances 0.000 claims description 28
- 239000002736 nonionic surfactant Substances 0.000 claims description 20
- 229920002873 Polyethylenimine Polymers 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 18
- 238000005406 washing Methods 0.000 claims description 18
- -1 amine compound Chemical class 0.000 claims description 17
- 239000004094 surface-active agent Substances 0.000 claims description 13
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 9
- 229920000570 polyether Polymers 0.000 claims description 9
- 125000004432 carbon atom Chemical group C* 0.000 claims description 7
- IUNMPGNGSSIWFP-UHFFFAOYSA-N dimethylaminopropylamine Chemical compound CN(C)CCCN IUNMPGNGSSIWFP-UHFFFAOYSA-N 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 6
- 125000000217 alkyl group Chemical group 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- QOHMWDJIBGVPIF-UHFFFAOYSA-N n',n'-diethylpropane-1,3-diamine Chemical compound CCN(CC)CCCN QOHMWDJIBGVPIF-UHFFFAOYSA-N 0.000 claims description 5
- KVKFRMCSXWQSNT-UHFFFAOYSA-N n,n'-dimethylethane-1,2-diamine Chemical compound CNCCNC KVKFRMCSXWQSNT-UHFFFAOYSA-N 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 125000002947 alkylene group Chemical group 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 description 15
- 239000006260 foam Substances 0.000 description 10
- 238000005187 foaming Methods 0.000 description 10
- 239000000243 solution Substances 0.000 description 10
- 238000010422 painting Methods 0.000 description 7
- 239000008367 deionised water Substances 0.000 description 6
- 229910021641 deionized water Inorganic materials 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000012085 test solution Substances 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 3
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 description 2
- BTRWELPXUDWAGW-UHFFFAOYSA-N 2,4,7,9-tetramethyldecane-4,7-diol Chemical compound CC(C)CC(C)(O)CCC(C)(O)CC(C)C BTRWELPXUDWAGW-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 229940102253 isopropanolamine Drugs 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 125000006833 (C1-C5) alkylene group Chemical group 0.000 description 1
- LXOFYPKXCSULTL-UHFFFAOYSA-N 2,4,7,9-tetramethyldec-5-yne-4,7-diol Chemical compound CC(C)CC(C)(O)C#CC(C)(O)CC(C)C LXOFYPKXCSULTL-UHFFFAOYSA-N 0.000 description 1
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical compound CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 description 1
- OPKOKAMJFNKNAS-UHFFFAOYSA-N N-methylethanolamine Chemical compound CNCCO OPKOKAMJFNKNAS-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000001414 amino alcohols Chemical class 0.000 description 1
- 230000003254 anti-foaming effect Effects 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 229960002887 deanol Drugs 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 1
- LVTYICIALWPMFW-UHFFFAOYSA-N diisopropanolamine Chemical compound CC(O)CNCC(C)O LVTYICIALWPMFW-UHFFFAOYSA-N 0.000 description 1
- 229940043276 diisopropanolamine Drugs 0.000 description 1
- 239000012897 dilution medium Substances 0.000 description 1
- 239000012972 dimethylethanolamine Substances 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 description 1
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 description 1
- KYCGURZGBKFEQB-UHFFFAOYSA-N n',n'-dibutylpropane-1,3-diamine Chemical compound CCCCN(CCCC)CCCN KYCGURZGBKFEQB-UHFFFAOYSA-N 0.000 description 1
- GCOWZPRIMFGIDQ-UHFFFAOYSA-N n',n'-dimethylbutane-1,4-diamine Chemical compound CN(C)CCCCN GCOWZPRIMFGIDQ-UHFFFAOYSA-N 0.000 description 1
- GZUCMODGDIGMBI-UHFFFAOYSA-N n',n'-dipropylpropane-1,3-diamine Chemical compound CCCN(CCC)CCCN GZUCMODGDIGMBI-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 125000004817 pentamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000012088 reference solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
Landscapes
- Detergent Compositions (AREA)
- Paints Or Removers (AREA)
Description
本発明は、水性塗料が付着した設備などの洗浄に用いる水性洗浄液、及びそれを用いた洗浄方法に関する。 The present invention relates to an aqueous cleaning liquid used for cleaning equipment or the like to which an aqueous paint is attached, and a cleaning method using the same.
自動車の車体パネル等の被塗装物に水性塗料を塗装する工場等においては、一般的に、同一の塗装装置を使用して連続的に塗装を行っている。このため、異なる色の水性塗料を塗装する場合には、各種塗装用の設備、装置、及び配管の内部などに付着した、前回使用した水性塗料を洗浄除去する必要がある。 In factories and the like that coat water-based paints on objects such as automobile body panels, the same painting equipment is generally used for continuous painting. For this reason, when painting water-based paints of different colors, it is necessary to wash and remove the water-based paints used last time, which have adhered to various painting equipment, equipment, and the inside of the piping.
但し、自動化された工場では被塗装物が連続して流れているため、塗装効率を向上させる観点からは、前回使用した塗料(配管の内部等に付着した塗料)をより短時間で洗浄除去する必要がある。このため、より洗浄効果の高い洗浄剤が求められている。 However, since the objects to be coated are continuously flowing in an automated factory, from the viewpoint of improving the painting efficiency, the paint (the paint adhering to the inside of the pipe) used last time is washed and removed in a shorter time. There is a need. For this reason, a cleaning agent with a higher cleaning effect is desired.
これまでには、例えば、水溶性グリコールエーテル、アミノアルコール、及び水を含有する水性塗料用の洗浄液が提案されている(特許文献1)。また、グリコールエーテル類、イソプロパノールアミン等のアミン、アセチレングリコール骨格を有する界面活性剤、及び水を含有する水性塗料用の洗浄剤が提案されている(特許文献2)。さらに、ポリエーテル変性シロキサン、アルカノールアミン、アセチレングリコール骨格を有する界面活性剤、及び水を含有する水性塗料用の洗浄液が提案されている(特許文献3)。 So far, for example, a cleaning liquid for water-based paints containing water-soluble glycol ether, amino alcohol, and water has been proposed (Patent Document 1). In addition, a detergent for water-based paints containing glycol ethers, amines such as isopropanolamine, surfactants having an acetylene glycol skeleton, and water has been proposed (Patent Document 2). Furthermore, a cleaning solution for water-based paints containing a polyether-modified siloxane, an alkanolamine, a surfactant having an acetylene glycol skeleton, and water has been proposed (Patent Document 3).
洗浄によって発生する水性塗料を含有する廃水は、通常、「粕池」等と呼ばれる処理槽に一旦導入される。しかしながら、従来の洗浄液を使用して発生した廃水は発泡しやすかったため、処理槽での作業性が低下するとともに、発泡が顕著な場合には処理槽から泡が溢れ出すといった不具合の発生も懸念されていた。 Waste water containing a water-based paint generated by washing is usually once introduced into a treatment tank called “Kashiike”. However, since wastewater generated using conventional cleaning liquids was easy to foam, workability in the treatment tank was lowered, and when foaming was remarkable, there was a concern about the occurrence of problems such as foam overflowing from the treatment tank. It was.
また、処理槽では廃水に塗料用の固液分離剤などが添加され、水性塗料などの固形分と水などの液体とを分離する固液分離などの浄化処理が実施される。しかしながら、従来の洗浄液は、固液分離剤の働きを阻害する場合が多い。このため、従来の洗浄液を使用して発生した廃水に適量とされる固液分離剤を添加しても十分に固液分離することが困難であるため、より多量の固液分離剤を添加する必要があった。 In the treatment tank, a solid-liquid separation agent for paint is added to the waste water, and a purification treatment such as solid-liquid separation for separating a solid content such as an aqueous paint and a liquid such as water is performed. However, the conventional cleaning liquid often inhibits the function of the solid-liquid separating agent. For this reason, even if an appropriate amount of solid-liquid separation agent is added to the wastewater generated using the conventional cleaning liquid, it is difficult to sufficiently separate the solid-liquid separation, so a larger amount of the solid-liquid separation agent is added. There was a need.
特許文献1及び3で提案された洗浄液は、洗浄性が不十分であるとともに、生ずる廃水が発泡しやすく、しかも固液分離剤の働きが阻害されやすいものであった。また、特許文献2で提案された洗浄剤は、廃水の発泡はある程度軽減されるものの、洗浄性は不十分であり、固液分離剤の働きも阻害される傾向にあった。すなわち、洗浄性に優れているとともに、廃水が発泡しにくく、かつ、廃水の固液分離性も良好であるといった複数の特性をバランスよく備えた水性塗料用の洗浄液は、これまで見当たらなかった。 The cleaning liquids proposed in Patent Documents 1 and 3 have insufficient cleaning properties, and the resulting waste water tends to foam, and the function of the solid-liquid separating agent is likely to be hindered. In addition, the cleaning agent proposed in Patent Document 2 has a tendency to reduce the foaming of wastewater to some extent, but has insufficient cleaning properties and inhibits the function of the solid-liquid separating agent. That is, there has not been found a cleaning solution for water-based paints that has a good balance of a plurality of characteristics such as excellent detergency, difficulty in foaming wastewater, and good solid-liquid separation of wastewater.
本発明は、このような従来技術の有する問題点に鑑みてなされたものであり、その課題とするところは、水性塗料の洗浄性に優れているとともに、洗浄によって生ずる水性塗料含有廃水が発泡しにくく、かつ、この水性塗料含有廃水の固液分離性が良好な水性洗浄液を提供することにある。また、本発明の課題とするところは、上記水性洗浄液を用いた洗浄方法を提供することにある。 The present invention has been made in view of such problems of the prior art, and the object of the present invention is that the water-based paint-containing wastewater generated by washing foams while being excellent in the washability of the water-based paint. An object of the present invention is to provide an aqueous cleaning liquid that is difficult and has good solid-liquid separation properties of this aqueous paint-containing wastewater. Another object of the present invention is to provide a cleaning method using the aqueous cleaning liquid.
すなわち、本発明によれば、以下に示す水性洗浄液が提供される。
[1]水性塗料が付着した設備、装置、又は物品の洗浄に用いられる水性洗浄液であって、下記一般式(1)で表されるアミン化合物、及びポリエチレンイミンを含有し、前記アミン化合物の含有割合が0.25質量%以上であり、前記ポリエチレンイミンの含有割合が0.07〜0.19質量%である水性洗浄液。
That is, according to the present invention, the following aqueous cleaning liquid is provided.
[1] An aqueous cleaning liquid used for cleaning equipment, equipment, or articles to which an aqueous paint is attached, which contains an amine compound represented by the following general formula (1) and polyethyleneimine, and contains the amine compound The aqueous cleaning liquid whose ratio is 0.25 mass% or more and whose content ratio of the said polyethyleneimine is 0.07-0.19 mass%.
(前記一般式(1)中、R1及びR2は、それぞれ独立に、炭素数1〜4のアルキル基を示し、Xは、炭素数1〜5のアルキレン基を示す) (In the general formula (1), R 1 and R 2 each independently represents an alkyl group having 1 to 4 carbon atoms, and X represents an alkylene group having 1 to 5 carbon atoms)
[2]ポリエーテル型ノニオン性界面活性剤及びアルカンジオール型ノニオン性界面活性剤の少なくともいずれかの界面活性剤をさらに含有する前記[1]に記載の水性洗浄液。
[3]前記界面活性剤の含有割合が0.01質量%以上である前記[2]に記載の水性洗浄液。
[4]前記アミン化合物が、ジメチルアミノプロピルアミン、ジエチルアミノプロピルアミン、及びジメチルエチレンジアミンからなる群より選択される少なくとも一種である前記[1]〜[3]のいずれかに記載の水性洗浄液。
[2] The aqueous cleaning liquid according to the above [1], further containing at least one of a polyether type nonionic surfactant and an alkanediol type nonionic surfactant.
[3] The aqueous cleaning liquid according to [2], wherein the content of the surfactant is 0.01% by mass or more.
[4] The aqueous cleaning liquid according to any one of [1] to [3], wherein the amine compound is at least one selected from the group consisting of dimethylaminopropylamine, diethylaminopropylamine, and dimethylethylenediamine.
また、本発明によれば、以下に示す洗浄方法が提供される。
[5]水性塗料が付着した設備、装置、又は物品に前記[1]〜[4]のいずれかに記載の水性洗浄液を接触させて前記水性塗料を洗い流す洗浄工程を有する洗浄方法。
[6]前記洗浄工程で生じた前記水性塗料を含有する廃水を処理槽に流入させて固液分離する工程をさらに有する前記[5]に記載の洗浄方法。
Moreover, according to this invention, the washing | cleaning method shown below is provided.
[5] A cleaning method including a cleaning step of washing the water-based paint by bringing the water-based cleaning liquid according to any one of [1] to [4] into contact with a facility, apparatus, or article to which the water-based paint is attached.
[6] The cleaning method according to [5], further including a step of causing the waste water containing the water-based paint generated in the cleaning step to flow into a treatment tank and solid-liquid separation.
本発明の水性洗浄液は、水性塗料の洗浄性に優れているとともに、洗浄によって生ずる水性塗料含有廃水が発泡しにくく、かつ、この水性塗料含有廃水の固液分離性が良好である。 The aqueous cleaning liquid of the present invention is excellent in the detergency of the aqueous paint, and the aqueous paint-containing wastewater generated by washing is difficult to foam, and the solid-liquid separation property of this aqueous paint-containing wastewater is good.
<水性洗浄液>
以下、本発明の実施の形態について説明するが、本発明は以下の実施の形態に限定されるものではない。本発明の水性洗浄液は、水性塗料が付着した設備、装置、又は物品の洗浄に用いられる洗浄液であり、一般式(1)で表されるアミン化合物、及びポリエチレンイミンを含有する。以下、その詳細について説明する。
<Aqueous cleaning solution>
Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments. The aqueous cleaning liquid of the present invention is a cleaning liquid used for cleaning equipment, devices, or articles to which an aqueous paint is attached, and contains an amine compound represented by the general formula (1) and polyethyleneimine. The details will be described below.
(アミン化合物)
本発明の水性洗浄液は、下記一般式(1)で表されるアミン化合物を含有する。このアミン化合物を含有することで、アルカノールアミンを含有させた従来の洗浄液に比べて、設備や配管の内部等に付着した水性塗料及びその固着物などを洗浄して除去する性能(洗浄性)に優れている。
(Amine compound)
The aqueous cleaning liquid of the present invention contains an amine compound represented by the following general formula (1). By containing this amine compound, compared to the conventional cleaning liquid containing alkanolamine, the performance (detergency) of cleaning and removing water-based paints and their adhering substances adhering to the inside of equipment and piping etc. Are better.
(前記一般式(1)中、R1及びR2は、それぞれ独立に、炭素数1〜4のアルキル基を示し、Xは、炭素数1〜5のアルキレン基を示す) (In the general formula (1), R 1 and R 2 each independently represents an alkyl group having 1 to 4 carbon atoms, and X represents an alkylene group having 1 to 5 carbon atoms)
一般式(1)中のR1及びR2で表される炭素数1〜4のアルキル基としては、メチル基、エチル基、プロピル基、及びブチル基などを挙げることができる。これらのアルキル基は分岐鎖であってもよい。R1及びR2は、それぞれ独立に、メチル基及びエチル基が好ましい。 Examples of the alkyl group having 1 to 4 carbon atoms represented by R 1 and R 2 in the general formula (1) include a methyl group, an ethyl group, a propyl group, and a butyl group. These alkyl groups may be branched. R 1 and R 2 are preferably each independently a methyl group or an ethyl group.
一般式(1)中のXで表される炭素数1〜5のアルキレン基としては、メチレン基、エチレン基、プロピレン基、ブチレン基、及びペンチレン基などを挙げることができる。これらのアルキレン基は分岐鎖であってもよい。Xは、エチレン基及びプロピレン基が好ましい。 As a C1-C5 alkylene group represented by X in General formula (1), a methylene group, ethylene group, a propylene group, a butylene group, a pentylene group, etc. can be mentioned. These alkylene groups may be branched. X is preferably an ethylene group or a propylene group.
アミン化合物の具体例としては、ジメチルアミノプロピルアミン、ジエチルアミノプロピルアミン、ジメチルエチレンジアミン、ジメチルアミノブチルアミン、ジプロピルアミノプロピルアミン、及びジブチルアミノプロピルアミンなどを挙げることができる。なかでも、ジメチルアミノプロピルアミン、ジエチルアミノプロピルアミン、及びジメチルエチレンジアミンが好ましい。これらのアミン化合物は、一種単独で又は二種以上を組み合わせて用いることができる。 Specific examples of the amine compound include dimethylaminopropylamine, diethylaminopropylamine, dimethylethylenediamine, dimethylaminobutylamine, dipropylaminopropylamine, and dibutylaminopropylamine. Of these, dimethylaminopropylamine, diethylaminopropylamine, and dimethylethylenediamine are preferable. These amine compounds can be used individually by 1 type or in combination of 2 or more types.
水性洗浄液中のアミン化合物の含有割合は、水性洗浄液全体を基準として、0.25質量%以上であり、好ましくは0.3質量%以上、さらに好ましくは0.35質量%以上、特に好ましくは0.4質量%以上である。アミン化合物の含有割合が0.25質量%未満であると、洗浄に長時間を要したり、洗浄残りが生じたりするなど洗浄性が不十分になる。なお、アミン化合物の含有割合の上限については特に限定されないが、洗浄性の向上効果が頭打ちになるなどの観点からは、0.6質量%以下であればよい。 The content ratio of the amine compound in the aqueous cleaning liquid is 0.25% by mass or more, preferably 0.3% by mass or more, more preferably 0.35% by mass or more, particularly preferably 0, based on the entire aqueous cleaning liquid. 4% by mass or more. When the content ratio of the amine compound is less than 0.25% by mass, the cleaning performance becomes insufficient such as a long time is required for cleaning or a cleaning residue is generated. The upper limit of the content ratio of the amine compound is not particularly limited, but may be 0.6% by mass or less from the viewpoint that the effect of improving the detergency reaches a peak.
(ポリエチレンイミン)
本発明の水性洗浄液は、ポリエチレンイミンを含有する。ポリエチレンイミンを含有することで、優れた洗浄性を維持しつつ、洗浄によって生ずる水性塗料含有廃水が発泡しにくくなる。しかも、水性塗料含有廃水の固液分離性が良好になるため、廃水処理効率を向上させることができる。さらに、より少量の固液分離剤によって容易に固液分離することが可能となるので、固液分離剤の使用量を減らすこともできる。
(Polyethyleneimine)
The aqueous cleaning liquid of the present invention contains polyethyleneimine. By containing the polyethyleneimine, the water-based paint-containing wastewater generated by washing is less likely to foam while maintaining excellent detergency. In addition, since the solid-liquid separability of the aqueous paint-containing wastewater is improved, the wastewater treatment efficiency can be improved. Furthermore, since it becomes possible to perform solid-liquid separation easily with a smaller amount of the solid-liquid separating agent, the amount of the solid-liquid separating agent used can be reduced.
ポリエチレンイミンは、その分子構造が直鎖状であっても分岐鎖状であってもよい。また、市場で入手可能な一般的なポリエチレンイミンであればよく、その分子量についても特に限定されず、一般的な分子量のポリエチレンイミンであれば用いることができる。具体的には、ポリエチレンイミンの重量平均分子量は、10,000〜200,000程度であればよく、30,000〜150,000程度のであることが好ましい。 The molecular structure of polyethyleneimine may be linear or branched. Moreover, it may be a general polyethyleneimine available on the market, and its molecular weight is not particularly limited, and any polyethyleneimine having a general molecular weight can be used. Specifically, the weight average molecular weight of polyethyleneimine may be about 10,000 to 200,000, and preferably about 30,000 to 150,000.
水性洗浄液中のポリエチレンイミンの含有割合は、水性洗浄液全体を基準として、0.07〜0.19質量%であり、好ましくは0.08〜0.17質量%、さらに好ましくは0.09〜0.15質量%である。ポリエチレンイミンの含有割合が0.07質量%未満であると、洗浄によって生ずる水性塗料含有廃水が発泡しやすくなるとともに、水性塗料含有廃水の固液分離が困難になる。一方、ポリエチレンイミンの含有割合が0.19質量%を超えると、水性塗料含有廃水の固液分離がかえって困難になる。 The content ratio of polyethyleneimine in the aqueous cleaning liquid is 0.07 to 0.19 mass%, preferably 0.08 to 0.17 mass%, more preferably 0.09 to 0, based on the entire aqueous cleaning liquid. 15% by mass. When the content ratio of the polyethyleneimine is less than 0.07% by mass, the aqueous paint-containing wastewater generated by the cleaning is easily foamed, and solid-liquid separation of the aqueous paint-containing wastewater becomes difficult. On the other hand, when the polyethyleneimine content exceeds 0.19% by mass, solid-liquid separation of the aqueous paint-containing wastewater becomes difficult.
(水)
本発明の水性洗浄液は「水性」であることから、通常、水を含有する。水は、水性洗浄液の溶媒、分散媒、又は希釈用媒体として機能する成分である。水として純水を使用する必要はなく、ある程度の不純物を含有する水であっても使用することができる。但し、水としては脱イオン水が好ましい。水性洗浄液中の水の含有割合は特に限定されず、水以外の成分が所望とする含有割合となるように配合されていればよい。なお、本発明の水性洗浄液は、各成分が使用(洗浄)時に所定の含有割合となっていればよい。このため、流通時や保管時などの使用(洗浄)前の段階では水の含有量が少ない濃縮状態としておき、使用(洗浄)時に各成分が所定の含有割合となるように水などの溶媒を添加して希釈してもよい。
(water)
Since the aqueous cleaning liquid of the present invention is “aqueous”, it usually contains water. Water is a component that functions as a solvent, a dispersion medium, or a dilution medium of the aqueous cleaning liquid. It is not necessary to use pure water as water, and even water containing a certain amount of impurities can be used. However, deionized water is preferred as the water. The content ratio of water in the aqueous cleaning liquid is not particularly limited as long as the components other than water have a desired content ratio. The aqueous cleaning liquid of the present invention only needs to have a predetermined content ratio when each component is used (cleaned). For this reason, in the stage before use (cleaning) such as distribution and storage, the water content is kept in a concentrated state, and a solvent such as water is used so that each component has a predetermined content ratio during use (cleaning). It may be added and diluted.
(界面活性剤)
本発明の水性洗浄液は、ポリエーテル型ノニオン性界面活性剤及びアルカンジオール型ノニオン性界面活性剤の少なくともいずれかの界面活性剤をさらに含有することが好ましい。このような特定の界面活性剤を含有させることで、洗浄によって生ずる水性塗料含有廃水の発泡をさらに抑制することができる。
(Surfactant)
The aqueous cleaning liquid of the present invention preferably further contains at least one of a polyether type nonionic surfactant and an alkanediol type nonionic surfactant. By containing such a specific surfactant, it is possible to further suppress the foaming of the aqueous paint-containing wastewater generated by washing.
ポリエーテル型ノニオン性界面活性剤は、その分子構造中に複数のポリエーテル結合を有するノニオン性の界面活性剤である。ポリエーテル型ノニオン性界面活性剤は、生じた泡を消す作用(消泡性、破泡性)を示す成分であると推測される。ポリエーテル型ノニオン性界面活性剤としては、市場で入手可能なものを用いることができる。ポリエーテル型ノニオン性界面活性剤の市販品としては、以下商品名で、「アデカノールLG−109」(ADEKA社製)、「アデカノールLG−126」(ADEKA社製)などがある。 The polyether type nonionic surfactant is a nonionic surfactant having a plurality of polyether bonds in its molecular structure. The polyether-type nonionic surfactant is presumed to be a component exhibiting an action (antifoaming property and foam breaking property) for eliminating the generated foam. As the polyether type nonionic surfactant, those commercially available can be used. Examples of commercially available polyether-type nonionic surfactants include “Adecanol LG-109” (manufactured by ADEKA), “Adecanol LG-126” (manufactured by ADEKA), and the like under the following trade names.
アルカンジオール型ノニオン性界面活性剤は、その分子構造中にアルカンジオール構造を有するノニオン性界面活性剤である。アルカンジオール型ノニオン性界面活性剤は、発泡を抑制する作用を示す成分であると推測される。アルカンジオール型ノニオン性界面活性剤としては、市場で入手可能なものを用いることができる。アルカンジオール型ノニオン性界面活性剤の市販品としては、以下商品名で、「EnviroGem AD01」(AIR PRODUCTS社製)、「Surfynol 104」(AIR PRODUCTS社製)、「Dynol 604」(AIR PRODUCTS社製)などがある。 The alkanediol type nonionic surfactant is a nonionic surfactant having an alkanediol structure in its molecular structure. The alkanediol type nonionic surfactant is presumed to be a component having an action of suppressing foaming. As the alkanediol type nonionic surfactant, those available on the market can be used. Commercially available products of alkanediol type nonionic surfactants are “EnviroGem AD01” (produced by AIR PRODUCTS), “Surfynol 104” (produced by AIR PRODUCTS), “Dynol 604” (produced by AIR PRODUCTS) under the following trade names: )and so on.
水性洗浄液中の上記の界面活性剤の含有割合は、水性洗浄液全体を基準として、0.01質量%以上であることが好ましく、0.03質量%以上であることがさらに好ましく、0.06質量%以上であることが特に好ましい。なお、界面活性剤の含有割合の上限については特に限定されないが、水性塗料含有廃水の発泡の抑制効果が頭打ちになるなどの観点からは、0.1質量%以下であればよい。 The content ratio of the surfactant in the aqueous cleaning liquid is preferably 0.01% by mass or more, more preferably 0.03% by mass or more, and 0.06% by mass based on the entire aqueous cleaning liquid. % Or more is particularly preferable. The upper limit of the content ratio of the surfactant is not particularly limited, but may be 0.1% by mass or less from the viewpoint that the effect of suppressing foaming of the aqueous paint-containing wastewater reaches a peak.
(その他の成分)
本発明の水性洗浄液には、本発明の効果が損なわれず、かつ、設備などの洗浄対象物や水性塗料に好ましくない影響を与えない範囲で、必要に応じて、有機溶剤やpH調整剤などのその他の成分を含有させてもよい。
(Other ingredients)
In the aqueous cleaning liquid of the present invention, the effects of the present invention are not impaired, and the organic solvent, pH adjuster, etc. are used as necessary, as long as they do not adversely affect the object to be cleaned such as equipment and the aqueous paint. Other components may be included.
<洗浄方法>
本発明の洗浄方法は、水性塗料が付着した設備、装置、又は物品に前述の水性洗浄液を接触させて水性塗料を洗い流す洗浄工程を有する。以下、その詳細について説明する。
<Washing method>
The cleaning method of the present invention includes a cleaning process in which the water-based paint is washed by bringing the water-based cleaning liquid into contact with the equipment, apparatus, or article to which the water-based paint is attached. The details will be described below.
(洗浄工程)
洗浄工程では、水性塗料が付着した設備などに水性洗浄液を接触させる。これにより、付着した水性塗料を洗い流すことができる。なお、洗浄によって、水性塗料を含有する廃水(水性塗料含有廃水)が生ずることになる。
(Washing process)
In the cleaning process, the aqueous cleaning liquid is brought into contact with the facility to which the aqueous paint is attached. Thereby, the adhering water-based paint can be washed away. In addition, waste water containing water-based paint (water-based paint-containing waste water) is generated by washing.
水性塗料の種類は特に限定されない。なお、本発明の洗浄方法で使用する水性洗浄液は、自動車の車体パネルの塗装などの水性塗料の塗装工程で生じた洗浄対象物から水性塗料を洗浄して除去するための洗浄液として好適である。このため、洗浄対象物となる設備としては、例えば、塗装環境を構成する設備などを挙げることができる。また、洗浄対象物となる装置としては、例えば、水性塗料塗装機などを挙げることができる。さらに、洗浄対象物となる器具としては、例えば、塗装機に水性塗料を供給する配管、塗装機のヘッド部位(ベルカップ)などを挙げることができる。 The type of water-based paint is not particularly limited. The aqueous cleaning liquid used in the cleaning method of the present invention is suitable as a cleaning liquid for cleaning and removing an aqueous paint from an object to be cleaned generated in a coating process of an aqueous paint such as painting of an automobile body panel. For this reason, as the equipment to be cleaned, for example, equipment constituting a painting environment can be cited. Moreover, as an apparatus used as a washing | cleaning target object, a water-based paint coating machine etc. can be mentioned, for example. Furthermore, examples of the appliance to be cleaned include a pipe for supplying a water-based paint to the coating machine, a head part (bell cup) of the coating machine, and the like.
また、水性塗料が付着した洗浄対象物に水性洗浄液を接触させる方法としては、洗浄対象物を水性洗浄液に浸漬する方法や、洗浄対象物に洗浄液を吹き付ける方法などがある。また、配管に水性洗浄液を接触させる方法としては、例えば、水性塗料の代わりに水性洗浄液を通液する方法や噴霧する方法などがある。さらに、塗装機のヘッド部位(ベルカップ)に水性洗浄液を接触させる方法としては、例えば、シャワーノズルなどを使用して水性洗浄液を流しかける方法などがある。 In addition, as a method of bringing the aqueous cleaning liquid into contact with the cleaning object to which the aqueous paint is attached, there are a method of immersing the cleaning object in the aqueous cleaning liquid, a method of spraying the cleaning liquid on the cleaning object, and the like. Examples of the method of bringing the aqueous cleaning liquid into contact with the pipe include a method of passing the aqueous cleaning liquid instead of the aqueous paint and a method of spraying. Further, as a method of bringing the aqueous cleaning liquid into contact with the head part (bell cup) of the coating machine, for example, there is a method of pouring the aqueous cleaning liquid using a shower nozzle or the like.
(廃水処理工程)
本発明の洗浄方法は、洗浄工程で生じた水性塗料を含有する廃水を処理槽に流入させて固液分離する工程(廃水処理工程)をさらに有することが好ましい。本発明の洗浄方法で使用する水性洗浄液は、前述の通り、洗浄によって生ずる廃水の固液分離性が良好である。このため、洗浄工程で生じた水性塗料含有廃水を粕池などの処理槽に流入させるとともに、必要に応じて塗料用の固液分離剤を添加することで、水性塗料などの固形分と、水などの液体とを効率的に分離して浄化することができる。また、洗浄工程で生じた水性塗料含有廃水は発泡しにくいため、処理槽から泡が溢れ出すといった不具合も発生せず、処理槽での浄化作業の効率が低下することもない。
(Wastewater treatment process)
It is preferable that the cleaning method of the present invention further includes a step (waste water treatment step) in which the waste water containing the water-based paint generated in the washing step flows into the treatment tank and is solid-liquid separated. As described above, the aqueous cleaning liquid used in the cleaning method of the present invention has good solid-liquid separation properties of waste water generated by cleaning. For this reason, the water-based paint-containing wastewater generated in the washing process is allowed to flow into a treatment tank such as Tsugaike, and if necessary, a solid-liquid separating agent for paint is added, so that solids such as water-based paint and water Can be separated and purified efficiently. In addition, since the water-based paint-containing wastewater generated in the washing process is difficult to foam, there is no problem that bubbles overflow from the processing tank, and the efficiency of the purification work in the processing tank does not decrease.
以下、本発明を実施例に基づいて具体的に説明するが、本発明はこれらの実施例に限定されるものではない。なお、実施例、比較例中の「部」及び「%」は、特に断らない限り質量基準である。 EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these Examples. In the examples and comparative examples, “parts” and “%” are based on mass unless otherwise specified.
<水性洗浄液の調製>
(実施例1)
ジメチルアミノプロピルアミン、ポリエチレンイミン(重量平均分子量:70,000)、及び脱イオン水を、ジメチルアミノプロピルアミンの含有割合が0.3%、及びポリエチレンイミンの含有割合が0.1%となるように混合して、水性洗浄液を調製した。
<Preparation of aqueous cleaning solution>
Example 1
Dimethylaminopropylamine, polyethyleneimine (weight average molecular weight: 70,000), and deionized water so that the content ratio of dimethylaminopropylamine is 0.3% and the content ratio of polyethyleneimine is 0.1%. To prepare an aqueous washing solution.
(実施例2〜10、比較例1〜12)
表1に示す含有割合となるように各成分と脱イオン水をそれぞれ混合したこと以外は、前述の実施例1と同様にして、水性洗浄液を調製した。表1中の「アミン化合物」の詳細を以下に示す。
*1:ジメチルアミノプロピルアミン
*2:ジエチルアミノプロピルアミン
*3:ジメチルエチレンジアミン
*4:イソプロパノールアミン
*5:モノメチルエタノールアミン
*6:モノメチルジエタノールアミン
*7:ジメチルエタノールアミン
*8:ジエタノールアミン
*9:ジイソプロパノールアミン
(Examples 2 to 10, Comparative Examples 1 to 12)
An aqueous cleaning solution was prepared in the same manner as in Example 1 except that each component and deionized water were mixed so as to achieve the content shown in Table 1. The details of the “amine compound” in Table 1 are shown below.
* 1: Dimethylaminopropylamine * 2: Diethylaminopropylamine * 3: Dimethylethylenediamine * 4: Isopropanolamine * 5: Monomethylethanolamine * 6: Monomethyldiethanolamine * 7: Dimethylethanolamine * 8: Diethanolamine * 9: Diisopropanolamine
また、表1中の「界面活性剤」としては、ポリエーテル型ノニオン性界面活性剤と、アルカンジオール型ノニオン性界面活性剤の混合物(ポリエーテル型:アルカンジオール型=5:1)を用いた。表1中の「界面活性剤」の含有割合(質量%)は、二種類の界面活性剤の合計の含有割合を意味する。使用した二種類の界面活性剤の詳細を以下に示す。
・ポリエーテル型ノニオン性界面活性剤:商品名「アデカノールLG−109」(ADEKA社製)
・アルカンジオール型ノニオン性界面活性剤:商品名「EnviroGem AD01」(AIR PRODUCTS社製)
In addition, as a “surfactant” in Table 1, a mixture of a polyether type nonionic surfactant and an alkanediol type nonionic surfactant (polyether type: alkanediol type = 5: 1) was used. . The content ratio (mass%) of “surfactant” in Table 1 means the total content ratio of the two types of surfactants. Details of the two surfactants used are shown below.
-Polyether type nonionic surfactant: Trade name "Adecanol LG-109" (manufactured by ADEKA)
・ Alkanediol type nonionic surfactant: Trade name “EnviroGem AD01” (produced by AIR PRODUCTS)
<評価>
(洗浄性)
縦100mm、幅30mm、厚さ1mmのアルミニウム製テストパネルを用意した。このテストパネルの下端30mmを水性塗料(商品名「WBC−717T」、カラーコード202、関西ペイント社製)に浸漬し、テストパネルの下端表面に水性塗料を塗布した。常温で5分間乾燥させた後、テストパネルの下端50mmを水性洗浄液に浸漬し、5分間洗浄した。洗浄後のテストパネルを目視観察して、水性塗料を塗布した領域におけるテストパネル表面の露出度(%)を算出し、以下に示す評価基準にしたがって洗浄性を評価した。結果を表2に示す。
◎:100%
○:50%以上100%未満
△:50%未満
<Evaluation>
(Cleanability)
An aluminum test panel having a length of 100 mm, a width of 30 mm, and a thickness of 1 mm was prepared. The lower end 30 mm of this test panel was immersed in an aqueous paint (trade name “WBC-717T”, color code 202, manufactured by Kansai Paint Co., Ltd.), and the aqueous paint was applied to the lower end surface of the test panel. After drying at room temperature for 5 minutes, the lower end 50 mm of the test panel was immersed in an aqueous cleaning solution and washed for 5 minutes. The washed test panel was visually observed to calculate the degree of exposure (%) of the test panel surface in the area where the water-based paint was applied, and the detergency was evaluated according to the following evaluation criteria. The results are shown in Table 2.
A: 100%
○: 50% or more and less than 100% △: Less than 50%
(非発泡性)
1000mLメスシリンダーに水性洗浄液500mLを入れ、エアストーンを使用して流量2.0L/minで空気を1分間通気した。通気後の発泡量(mL)を測定し、以下に示す評価基準にしたがって非発泡性(水性塗料添加なし)を評価した。結果を表2に示す。また、1000mLメスシリンダーに、水性塗料(商品名「WBC−717T」、カラーコード202、関西ペイント社製)を0.1%となるように添加した水性洗浄液500mLを入れ、エアストーンを使用して流量2.0L/minで空気を1分間通気した。通気後の発泡量(mL)を測定し、以下に示す評価基準にしたがって非発泡性(水性塗料添加あり)を評価した。結果を表2に示す。
◎:50mL未満
○:50mL以上100mL未満
△:100mL以上500mL未満
×:500mL以上
(Non-foaming)
An aqueous cleaning solution (500 mL) was placed in a 1000 mL graduated cylinder, and air was passed through the air stone at a flow rate of 2.0 L / min for 1 minute. The amount of foam after aeration (mL) was measured, and the non-foaming property (no water-based paint added) was evaluated according to the following evaluation criteria. The results are shown in Table 2. In addition, 500 mL of an aqueous cleaning solution to which water-based paint (trade name “WBC-717T”, color code 202, manufactured by Kansai Paint Co., Ltd.) is added to 0.1% is added to a 1000 mL graduated cylinder, and air stone is used. Air was aerated for 1 minute at a flow rate of 2.0 L / min. The amount of foaming (mL) after aeration was measured, and non-foaming property (with water-based paint added) was evaluated according to the following evaluation criteria. The results are shown in Table 2.
◎: Less than 50 mL ○: 50 mL or more and less than 100 mL △: 100 mL or more and less than 500 mL ×: 500 mL or more
(固液分離性)
脱イオン水と水性洗浄液の混合液(脱イオン水:水性洗浄液=4:1)に、水性塗料(商品名「WBC−717T」、カラーコード202、関西ペイント社製)を0.1%となるように添加して試験液を調製した。200mL栓付きメスシリンダーに調製した試験液100mLを入れるとともに、塗料用の固液分離剤(商品名「MG−WTW855」、パーカーコーポレーション社製)を所定濃度となるように添加して20回振とうした。振とう後の試験液の外観を目視観察し、試験液の清澄性を得ることができる固液分離剤の必要濃度を測定した。
(Solid-liquid separation)
Water-based paint (trade name “WBC-717T”, color code 202, manufactured by Kansai Paint Co., Ltd.) is 0.1% in a mixture of deionized water and aqueous cleaning liquid (deionized water: aqueous cleaning liquid = 4: 1). To prepare a test solution. Add 100 mL of the prepared test solution to a 200 mL stoppered graduated cylinder, add a solid-liquid separating agent for paint (trade name “MG-WTW855”, manufactured by Parker Corporation) to a predetermined concentration and shake 20 times. did. The appearance of the test solution after shaking was visually observed, and the required concentration of the solid-liquid separating agent that can obtain the clarity of the test solution was measured.
一方、脱イオン水に上記の水性塗料を0.1%となるように添加して基準液(水性洗浄液を含有しない)を調製した。200mL栓付きメスシリンダーに調製した基準液100mLを入れるとともに、上記の固液分離剤を所定濃度となるように添加して20回振とうし、試験液の清澄性を得ることができる固液分離剤の必要濃度(基準濃度)を測定した。測定した各水性洗浄液の固液分離剤の必要濃度と基準濃度とを比較し、以下に示す評価基準にしたがって固液分離性を評価した。結果を表2に示す。
◎:必要濃度が基準量よりも大幅に少ない(固液分離剤が不要である)。
○:必要濃度が基準量よりも少ない。
△:必要濃度が基準濃度と同等である。
×:必要濃度が基準量よりも多い。
On the other hand, the above-mentioned water-based paint was added to deionized water so as to be 0.1% to prepare a reference liquid (not containing an aqueous cleaning liquid). Solid liquid separation in which 100 mL of the reference solution prepared in a 200 mL stoppered graduated cylinder is added and the above solid-liquid separating agent is added to a predetermined concentration and shaken 20 times to obtain the clarity of the test liquid. The required concentration (reference concentration) of the agent was measured. The required concentration of the solid-liquid separating agent in each aqueous cleaning solution and the reference concentration were compared, and the solid-liquid separation property was evaluated according to the following evaluation criteria. The results are shown in Table 2.
A: The required concentration is significantly less than the reference amount (no solid-liquid separation agent is required).
○: The required concentration is less than the reference amount.
Δ: The necessary concentration is equivalent to the reference concentration.
X: The required concentration is higher than the reference amount.
本発明の水性洗浄液は、例えば、水溶性塗料を扱う様々な設備、装置、及び物品などを洗浄するための洗浄液として有用である。 The aqueous cleaning liquid of the present invention is useful, for example, as a cleaning liquid for cleaning various equipment, devices, articles and the like that handle water-soluble paints.
Claims (6)
下記一般式(1)で表されるアミン化合物、及びポリエチレンイミンを含有し、
前記アミン化合物の含有割合が0.25質量%以上であり、
前記ポリエチレンイミンの含有割合が0.07〜0.19質量%である水性洗浄液。
(前記一般式(1)中、R1及びR2は、それぞれ独立に、炭素数1〜4のアルキル基を示し、Xは、炭素数1〜5のアルキレン基を示す) Equipment aqueous coating adheres, apparatus, or after washing the article with an aqueous cleaning solution used in the cleaning method wherein the solid-liquid separating the solid and liquid containing the water-based paint in the wastewater produced by washing,
Containing an amine compound represented by the following general formula (1) and polyethyleneimine,
The amine compound content is 0.25% by mass or more,
The aqueous washing | cleaning liquid whose content rate of the said polyethyleneimine is 0.07-0.19 mass%.
(In the general formula (1), R 1 and R 2 each independently represents an alkyl group having 1 to 4 carbon atoms, and X represents an alkylene group having 1 to 5 carbon atoms)
前記洗浄工程で生じた前記水性塗料を含有する廃水を処理槽に流入させて、前記水性塗料を含む固形分と液体とを固液分離する工程と、を有する洗浄方法。 A cleaning process in which the water-based paint is contacted with the equipment, device, or article to which the water-based paint is attached, and the water-based paint is washed away by contacting the water-based cleaning liquid according to any one of claims 1 to 5 ;
A step of causing the waste water containing the water-based paint generated in the cleaning step to flow into a treatment tank and solid-liquid separation of the solid content and the liquid containing the water-based paint .
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