JP7291457B1 - Aqueous coating remover composition and method for removing existing coating using the same - Google Patents
Aqueous coating remover composition and method for removing existing coating using the same Download PDFInfo
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- JP7291457B1 JP7291457B1 JP2023007725A JP2023007725A JP7291457B1 JP 7291457 B1 JP7291457 B1 JP 7291457B1 JP 2023007725 A JP2023007725 A JP 2023007725A JP 2023007725 A JP2023007725 A JP 2023007725A JP 7291457 B1 JP7291457 B1 JP 7291457B1
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- JP
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- Prior art keywords
- water
- solvent
- paint film
- stripping
- remover
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims abstract description 37
- 238000000576 coating method Methods 0.000 title claims description 76
- 239000011248 coating agent Substances 0.000 title claims description 69
- 238000000034 method Methods 0.000 title claims description 9
- 239000003973 paint Substances 0.000 claims abstract description 150
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 130
- 239000002904 solvent Substances 0.000 claims abstract description 88
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- GNKZMNRKLCTJAY-UHFFFAOYSA-N 4'-Methylacetophenone Chemical compound CC(=O)C1=CC=C(C)C=C1 GNKZMNRKLCTJAY-UHFFFAOYSA-N 0.000 claims abstract description 12
- VXQBJTKSVGFQOL-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethyl acetate Chemical compound CCCCOCCOCCOC(C)=O VXQBJTKSVGFQOL-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000006184 cosolvent Substances 0.000 claims description 12
- 238000007790 scraping Methods 0.000 claims description 7
- MFKRHJVUCZRDTF-UHFFFAOYSA-N 3-methoxy-3-methylbutan-1-ol Chemical compound COC(C)(C)CCO MFKRHJVUCZRDTF-UHFFFAOYSA-N 0.000 claims description 6
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 abstract description 2
- 239000002562 thickening agent Substances 0.000 description 40
- 239000000126 substance Substances 0.000 description 30
- WVDDGKGOMKODPV-UHFFFAOYSA-N Benzyl alcohol Chemical compound OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 description 27
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 24
- 239000003795 chemical substances by application Substances 0.000 description 21
- 239000003960 organic solvent Substances 0.000 description 20
- 238000002372 labelling Methods 0.000 description 16
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 15
- 239000002585 base Substances 0.000 description 15
- 238000001035 drying Methods 0.000 description 13
- 239000007788 liquid Substances 0.000 description 13
- 239000000839 emulsion Substances 0.000 description 12
- 230000009471 action Effects 0.000 description 11
- 239000004480 active ingredient Substances 0.000 description 9
- 239000007864 aqueous solution Substances 0.000 description 9
- 235000019445 benzyl alcohol Nutrition 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
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- 239000000654 additive Substances 0.000 description 7
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- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000009835 boiling Methods 0.000 description 6
- 230000036541 health Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
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- 229920005749 polyurethane resin Polymers 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
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- 238000001704 evaporation Methods 0.000 description 3
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- VAJVDSVGBWFCLW-UHFFFAOYSA-N 3-Phenyl-1-propanol Chemical compound OCCCC1=CC=CC=C1 VAJVDSVGBWFCLW-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 2
- QUSNBJAOOMFDIB-UHFFFAOYSA-N Ethylamine Chemical compound CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 description 2
- 229920002907 Guar gum Polymers 0.000 description 2
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
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- 231100000206 health hazard Toxicity 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- 238000007761 roller coating Methods 0.000 description 2
- 239000000080 wetting agent Substances 0.000 description 2
- PAAZPARNPHGIKF-UHFFFAOYSA-N 1,2-dibromoethane Chemical compound BrCCBr PAAZPARNPHGIKF-UHFFFAOYSA-N 0.000 description 1
- QZBQVKLWWYDSQB-UHFFFAOYSA-N 1-aminobutan-2-ol;2-amino-2-methylpropan-1-ol Chemical compound CCC(O)CN.CC(C)(N)CO QZBQVKLWWYDSQB-UHFFFAOYSA-N 0.000 description 1
- RWNUSVWFHDHRCJ-UHFFFAOYSA-N 1-butoxypropan-2-ol Chemical compound CCCCOCC(C)O RWNUSVWFHDHRCJ-UHFFFAOYSA-N 0.000 description 1
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- IBLKWZIFZMJLFL-UHFFFAOYSA-N 1-phenoxypropan-2-ol Chemical compound CC(O)COC1=CC=CC=C1 IBLKWZIFZMJLFL-UHFFFAOYSA-N 0.000 description 1
- WYTRYIUQUDTGSX-UHFFFAOYSA-N 1-phenylpropan-2-ol Chemical compound CC(O)CC1=CC=CC=C1 WYTRYIUQUDTGSX-UHFFFAOYSA-N 0.000 description 1
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 1
- IOAOAKDONABGPZ-UHFFFAOYSA-N 2-amino-2-ethylpropane-1,3-diol Chemical compound CCC(N)(CO)CO IOAOAKDONABGPZ-UHFFFAOYSA-N 0.000 description 1
- UXFQFBNBSPQBJW-UHFFFAOYSA-N 2-amino-2-methylpropane-1,3-diol Chemical compound OCC(N)(C)CO UXFQFBNBSPQBJW-UHFFFAOYSA-N 0.000 description 1
- QCDWFXQBSFUVSP-UHFFFAOYSA-N 2-phenoxyethanol Chemical compound OCCOC1=CC=CC=C1 QCDWFXQBSFUVSP-UHFFFAOYSA-N 0.000 description 1
- LOJHHQNEBFCTQK-UHFFFAOYSA-N 2-phenoxypropan-1-ol Chemical compound OCC(C)OC1=CC=CC=C1 LOJHHQNEBFCTQK-UHFFFAOYSA-N 0.000 description 1
- AWVDYRFLCAZENH-UHFFFAOYSA-N 3-phenoxypropan-1-ol Chemical compound OCCCOC1=CC=CC=C1 AWVDYRFLCAZENH-UHFFFAOYSA-N 0.000 description 1
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- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 241000282412 Homo Species 0.000 description 1
- ODKSFYDXXFIFQN-BYPYZUCNSA-P L-argininium(2+) Chemical compound NC(=[NH2+])NCCC[C@H]([NH3+])C(O)=O ODKSFYDXXFIFQN-BYPYZUCNSA-P 0.000 description 1
- KDXKERNSBIXSRK-YFKPBYRVSA-N L-lysine Chemical compound NCCCC[C@H](N)C(O)=O KDXKERNSBIXSRK-YFKPBYRVSA-N 0.000 description 1
- KDXKERNSBIXSRK-UHFFFAOYSA-N Lysine Natural products NCCCCC(N)C(O)=O KDXKERNSBIXSRK-UHFFFAOYSA-N 0.000 description 1
- 239000004472 Lysine Substances 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- DYUQAZSOFZSPHD-UHFFFAOYSA-N Phenylpropanol Chemical compound CCC(O)C1=CC=CC=C1 DYUQAZSOFZSPHD-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
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- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
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- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
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- 150000001412 amines Chemical class 0.000 description 1
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- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000002519 antifouling agent Substances 0.000 description 1
- ODKSFYDXXFIFQN-UHFFFAOYSA-N arginine Natural products OC(=O)C(N)CCCNC(N)=N ODKSFYDXXFIFQN-UHFFFAOYSA-N 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
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- 229940105329 carboxymethylcellulose Drugs 0.000 description 1
- 235000010418 carrageenan Nutrition 0.000 description 1
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- 229920001525 carrageenan Polymers 0.000 description 1
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- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 150000002611 lead compounds Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- XVTQAXXMUNXFMU-UHFFFAOYSA-N methyl 2-(3-oxo-2-pyridin-2-yl-1h-pyrazol-5-yl)acetate Chemical compound N1C(CC(=O)OC)=CC(=O)N1C1=CC=CC=N1 XVTQAXXMUNXFMU-UHFFFAOYSA-N 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
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- 229960005323 phenoxyethanol Drugs 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
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- 229910021647 smectite Inorganic materials 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
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- 238000009423 ventilation Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
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- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Paints Or Removers (AREA)
Abstract
【課題】ベンジルアルコールを使用した従来の水系塗膜剥離剤組成物に替わる水系塗膜剥離剤組成物であって、危険有害性が低く、且つ従来の水系塗膜剥離剤組成物と同等以上の塗膜剥離性を有する水系塗膜剥離剤組成物を提供する。【解決手段】二液反応硬化型塗料に対する塗膜剥離性を有する剥離溶剤（Ａ）として、ｐ－メチルアセトフェノン、ジエチレングリコールモノブチルエーテルアセテートのうち、いずれか一方又は双方を１０～５０重量％含有し、その他の剥離溶剤（Ａ）を実質的に含有していない。必要に応じて、二液反応硬化型塗料に対する塗膜剥離性を有しない塗膜非剥離性の水溶性補助溶剤（Ｂ）として、３－メトキシ－３－メチル－１－ブタノールを５～６５重量％混合することもできる。【選択図】なし[Problem] To provide a water-based paint-stripping composition that can replace conventional water-based paint-stripping compositions using benzyl alcohol, which has low hazards and is equivalent or superior to conventional water-based paint-stripping compositions. Provided is a water-based paint film remover composition having paint film releasability. SOLUTION: As a stripping solvent (A) having paint film stripping properties for a two-component reaction curing type paint, one or both of p-methylacetophenone and diethylene glycol monobutyl ether acetate are contained in an amount of 10 to 50% by weight, It does not substantially contain other release solvents (A). If necessary, 5 to 65 wt. % can also be mixed. [Selection figure] None
Description
本発明は、剥離溶剤としてベンジルアルコールを使用した従来の水系塗膜剥離剤組成物（以下、適宜「水系塗膜剥離剤」とも称す）に替わる水系塗膜剥離剤組成物であって、危険有害性が低く、且つ従来の水系塗膜剥離剤組成物と同等以上の塗膜剥離性を有する水系塗膜剥離剤組成物と、これを用いた二液反応硬化型塗料からなる既存塗膜の除去方法に関する。 The present invention provides a water-based paint remover composition that can replace a conventional water-based paint remover composition using benzyl alcohol as a remover solvent (hereinafter also referred to as a "water-based paint remover"), which is hazardous and harmful. A water-based paint film-removing agent composition having low resistance and a paint film-releasing property equal to or greater than that of conventional water-based paint film-removing compositions, and removal of an existing paint film composed of a two-component reaction curing type paint using the same Regarding the method.
従来より、鉄鋼製の建造物や構造物などには、美粧化、表面保護、特殊機能付与などを目的として表面に塗料を塗布し、塗膜が形成されている。しかしながら、塗膜は自然環境や使用環境に晒されることで経時劣化し、本来の目的を徐々に維持できなくなる。そのため、塗膜の機能を回復させる手段として塗替えを実施するが、その際、劣化した既存塗膜を除去しなければならない場合がある。既存塗膜の除去方法としては、動力工具等のケレン工具を用いた物理的ケレンと、補助的に塗膜剥離剤を用いる化学的ケレンとがあり、後者にはケレン時に発生する塗膜粉塵を抑制できる長所がある。 2. Description of the Related Art Conventionally, steel buildings and structures are coated with a paint to form a coating film for the purpose of beautification, surface protection, provision of special functions, and the like. However, the paint film deteriorates over time due to exposure to the natural environment and usage environment, and gradually loses its original purpose. Therefore, repainting is carried out as a means of recovering the function of the coating film, but in that case, the deteriorated existing coating film must be removed in some cases. As a method for removing the existing paint film, there are physical scraping using a scraping tool such as a power tool, and chemical scraping using a coating remover as a supplementary method. There are advantages that can be suppressed.
ここで、かつての塗膜には、鉛化合物、クロム化合物およびＰＣＢなどの人体に対する有害物質が含まれていた。このため、現在ではこのような鉛など有害物質を含有する既存塗膜の剥離や掻き落とし作業（ケレン作業）を行う場合は、必ず既存塗膜を湿潤化する、もしくは、湿潤化した場合と同じ程度の粉塵濃度まで低減させる方策を講じた上で作業を実施することが定められている。 In the past, coating films contained harmful substances to the human body, such as lead compounds, chromium compounds, and PCBs. For this reason, at present, when peeling off or scraping off an existing paint film containing harmful substances such as lead (cleaning work), the existing paint film must be wetted, or the same as when wetted. It is stipulated that work should be carried out after taking measures to reduce the dust concentration to a certain level.
この湿潤化によるケレン作業の代表的なものが、前述の塗膜剥離剤を用いる化学的ケレンであり、過去より、塩化メチレン系の剥離溶剤（塗膜剥離性成分）を有効成分とする塗膜剥離剤が長年使用されていた。しかしながら、塩化メチレン系の塗膜剥離剤は既存塗膜の剥離性能に優れる反面、人体に対する有害性が高い。そのため、近年では塩化メチレン系よりも剥離性能は劣るが、危険有害性の低い水系塗膜剥離剤が多用されている。水系塗膜剥離剤の有効成分は、既存塗膜を形成する有機樹脂との親和性の高い有機溶剤からなる剥離溶剤であり、このような剥離溶剤が既存塗膜に浸透し、既存塗膜を膨潤軟化させ、既存塗膜の付着力を低下させることで、既存塗膜の除去を容易とするものである。しかし、塩化メチレン系と比べれば安全性が高いとしても、有機溶剤が人体や環境に対して有害であることには変わりがない。このため、有機溶剤を剥離溶剤として使用する場合は、危険有害性がより低いものを選定する必要がある。 A representative of this cleaning work by wetting is chemical cleaning using the above-mentioned paint film remover, and from the past, the coating film with a methylene chloride-based stripping solvent (coating film peeling component) as an active ingredient Exfoliants have been used for many years. However, methylene chloride-based paint film stripping agents are highly harmful to the human body, although they are excellent in their ability to remove existing paint films. For this reason, in recent years, water-based paint film removers, which are less hazardous than methylene chloride-based paint removers, have been widely used, although their peeling performance is inferior. The active ingredient of the water-based paint remover is a remover solvent composed of an organic solvent that has a high affinity with the organic resin that forms the existing paint film. It swells and softens and reduces the adhesion of the existing coating film, thereby facilitating the removal of the existing coating film. However, even though they are safer than methylene chloride, organic solvents are still harmful to the human body and the environment. Therefore, when an organic solvent is used as a stripping solvent, it is necessary to select one with lower hazards.
日本のＧＨＳ（Ｔｈｅ Ｇｌｏｂａｌｌｙ Ｈａｒｍｏｎｉｚｅｄ Ｓｙｓｔｅｍ ｏｆ Ｃｌａｓｓｉｆｉｃａｔｉｏｎ ａｎｄ Ｌａｂｅｌｌｉｎｇ ｏｆ Ｃｈｅｍｉｃａｌｓ）において、化学製品の危険有害性は、製品のラベル表示および製品の譲渡時に交付されるＳＤＳ（ＳＡＦＴＹ ＤＡＴＡ ＳＨＥＥＴ）により評価することができる。また、「労働安全衛生法」、「特定化学物質の環境への排出量の把握等及び管理の改善の促進に関する法律」および「毒物及び劇物取締法」（以下、「労働安全衛生法など」と称す）では、危険有害性に留意する物質をそれぞれ個別に指定して表示・通知義務の対象物質としており、これに該当する有機溶剤の含有の有無についても、製品のラベル表示やＳＤＳで確認することができる。 In Japan's GHS (The Globally Harmonized System of Classification and Labeling of Chemicals), the hazards of chemical products can be evaluated by SDS (SAFTY DATA SHEET) issued at the time of product labeling and product transfer. In addition, the "Industrial Safety and Health Act", "Law Concerning Monitoring, etc. of Emissions of Specified Chemical Substances into the Environment and Promotion of Improvements in Management", and "Poisonous and Deleterious Substances Control Act" (hereinafter referred to as "Industrial Safety and Health Act, etc.") ), individually designates substances for which hazards must be paid attention to as substances subject to labeling and notification obligations, and confirms the presence or absence of organic solvents corresponding to this by labeling and SDS of products. can do.
また、有機溶剤は引火性を有し、火災を引き起こす危険性があるため、塗膜剥離剤用の剥離溶剤として使用する場合はできるだけ沸点が高いものを選択し、さらに水を混合して引火点が生じないようにして、非危険物化することができる。ところが、塗膜剥離性が良好な有機溶剤は一般的に水に難溶なものが多く、水と相溶せずに液相分離するため、均質な液状の塗膜剥離剤を形成できない。このため、既存の水系塗膜剥離剤では、水に難溶な有機溶剤を水に乳化分散させてエマルション状にするか、あるいは、水溶性溶剤を併用することで水に難溶な有機溶剤を水溶液状にすることで、水を含有させている。 In addition, since organic solvents are flammable and may cause fires, when using them as stripping solvents for paint film stripping agents, select a solvent with a boiling point as high as possible. can be made non-dangerous goods. However, many organic solvents with good coating film releasability are generally sparingly soluble in water, and are not compatible with water, causing liquid phase separation. For this reason, in the existing water-based coating film remover, the poorly water-soluble organic solvent is emulsified and dispersed in water to form an emulsion, or a water-soluble solvent is used in combination to remove the poorly water-soluble organic solvent. Water is contained by forming an aqueous solution.
塩化メチレン系に比べて危険有害性の低い有機溶剤を剥離溶剤（塗膜剥離性成分）として使用し、エマルション化または水溶液化した水系塗膜剥離剤の中でも、剥離溶剤としてベンジルアルコールを用いた水系塗膜剥離剤が特に多数開示されている。このような技術としては、例えば下記特許文献１、特許文献２および特許文献３などを例示できる。 An organic solvent that is less hazardous than methylene chloride is used as a stripping solvent (coating stripping component), and among water-based coating stripping agents that have been emulsified or made into an aqueous solution, water-based using benzyl alcohol as a stripping solvent Particularly numerous paint strippers have been disclosed. Examples of such techniques include the following patent documents 1, 2 and 3.
他に、ジメチルホルムアミドなどのアミド系物質を剥離溶剤として含有する水溶性剥離剤組成物が特許文献４に、環状ケトンなどを剥離溶剤として使用する酸性マイクロエマルジョン剥離調合物が特許文献５に、Ｎ－メチル－２－ピロリドンなどを剥離溶剤として使用する塗膜剥離剤が特許文献６に、それぞれ開示されている。 In addition, a water-soluble stripping agent composition containing an amide substance such as dimethylformamide as a stripping solvent is disclosed in Patent Document 4, an acidic microemulsion stripping formulation using a cyclic ketone or the like as a stripping solvent is disclosed in Patent Document 5, N Patent Literature 6 discloses coating stripping agents using methyl-2-pyrrolidone or the like as a stripping solvent.
さらに、アルコール系の水溶性有機溶剤を使用する樹脂ワックス膜用の剥離剤組成物が特許文献７に、水溶性有機溶剤を使用するフロアーポリッシュ組成物からなる床皮膜用の剥離剤組成物が特許文献８に、それぞれ開示されている。 Further, a remover composition for resin wax films using an alcohol-based water-soluble organic solvent is disclosed in Patent Document 7, and a remover composition for floor coatings comprising a floor polish composition using a water-soluble organic solvent is disclosed in Patent Document 7. Document 8 discloses each of them.
現在、鉄鋼製の構造物や建造物などの塗り替え改修時の塗膜剥離には水系塗膜剥離剤が多用されているが、その実質的な有効成分となる剥離溶剤としては、ベンジルアルコールを使用するものが殆どである。ベンジルアルコールは、エポキシ樹脂塗料やポリウレタン樹脂塗料のように、塗料の中でも架橋度が高く、剥離が困難な部類の二液反応硬化形塗料に対して塗膜剥離性が良好である。また、臭気が少ないため作業環境面でも好ましい。さらに、比較的安価で入手も容易であるため、これまで代替となる剥離溶剤は見出されていなかった。しかし、最近になり、道路鋼橋の改修時に溶剤中毒や化学火傷の事故が頻発したことを契機に、２０２１年１月より労働安全衛生法が規定する表示・通知義務の対象物質としてベンジルアルコールが追加指定された。したがって、特許文献１～３に記載の水系塗膜剥離剤は、従来は比較的危険有害性の低い水系塗膜剥離剤として扱われていたが、現在の安全性基準では危険有害性の低いものとは見なせない。 Currently, water-based paint film removers are often used to remove paint films when repainting steel structures and buildings, and benzyl alcohol is used as the remover solvent, which is the substantial active ingredient. Most of them do. Benzyl alcohol has a high degree of cross-linking among paints, such as epoxy resin paints and polyurethane resin paints, and has good paint peelability for two-component reaction curing paints that are difficult to peel off. In addition, since it has little odor, it is preferable in terms of working environment. Furthermore, due to their relative low cost and ready availability, no alternative stripping solvent has been found to date. Recently, however, there have been frequent incidents of solvent poisoning and chemical burns during the repair of road steel bridges. additionally specified. Therefore, the water-based paint film removers described in Patent Documents 1 to 3 were conventionally treated as water-based paint film removers with relatively low hazards, but the current safety standards are low hazards. cannot be regarded as
特許文献４～６に記載の水系塗膜剥離剤は、労働安全衛生法が規定する危険有害性に留意する物質として従来から表示・通知義務のある剥離溶剤を使用しており、元々危険有害性の高いものである。 The water-based coating remover described in Patent Documents 4 to 6 uses a peeling solvent that has traditionally been obliged to display and notify as a substance that pays attention to the hazards stipulated by the Industrial Safety and Health Act, and is originally hazardous. is high.
特許文献７～８に記載の水系塗膜剥離剤は、水溶性溶剤を剥離溶剤として使用しているが、水溶性溶剤では二液反応硬化型塗料のような架橋度の高い既存塗膜に対して剥離効果（塗膜剥離性）が弱く、実用的ではない。 The water-based paint film remover described in Patent Documents 7 and 8 uses a water-soluble solvent as a peeling solvent, but the water-soluble solvent is not suitable for existing paint films with a high degree of cross-linking such as two-component reaction curing paints. However, the peeling effect (paint peelability) is weak, and it is not practical.
水系塗膜剥離剤の危険有害性を低減するには、危険有害性の低い有機溶剤を剥離溶剤として使用することが必要である。その指標としては、労働安全衛生法などによる表示・通知義務の対象物質に該当しない有機溶剤を使用する必要がある。同時に、剥離が困難な部類の二液反応硬化形塗料からなる既存塗膜に対して、少なくともベンジルアルコールを有効成分とする水系塗膜剥離剤と同等の塗膜剥離性が担保されている必要もある。 To reduce the hazards of water-based paint strippers, it is necessary to use less hazardous organic solvents as stripping solvents. As an index, it is necessary to use organic solvents that do not correspond to substances subject to labeling and notification obligations under the Industrial Safety and Health Act. At the same time, it is also necessary to ensure at least the same level of peelability as a water-based paint remover with benzyl alcohol as an active ingredient for existing paint films made of two-component reaction curing paints that are difficult to remove. be.
そこで、本発明は上記課題を解決するものであって、剥離溶剤としてベンジルアルコールを使用した従来の水系塗膜剥離剤組成物に替わる水系塗膜剥離剤組成物であって、危険有害性が低く、且つ従来の水系塗膜剥離剤組成物と同等以上の塗膜剥離性を有する水系塗膜剥離剤組成物と、これを用いた二液反応硬化型塗料からなる既存塗膜の除去方法を提供することを目的とする。 Therefore, the present invention solves the above problems, and is a water-based paint remover composition that can replace the conventional water-based paint remover composition using benzyl alcohol as a remover solvent, and has low hazards. and a water-based paint-removing composition having a paint-removing property equal to or greater than that of conventional water-based paint-removing compositions; intended to
なお、本発明において、剥離溶剤（有機溶剤）の「危険有害性が低い」とは、労働安全衛生法などによる表示・通知義務の対象物質（以下、単に「表示・通知義務の対象物質」と称す）に該当しないことを意味する。また、水系塗膜剥離剤の「危険有害性が低い」とは、製品のラベル表示およびＳＤＳにおいて、危険有害性区分の絵表示がないか、感嘆符だけとなり、かつ、消防法の危険物に該当しないことを意味する。 In the present invention, the "low hazard" of the stripping solvent (organic solvent) means a substance subject to the obligation to display and notify under the Industrial Safety and Health Act (hereinafter simply referred to as "substance subject to the obligation to display and notify"). It means that it does not correspond to In addition, water-based paint remover "low hazard" means that there is no pictorial indication of hazard classification or only an exclamation point on the product label and SDS, and it is a hazardous material under the Fire Service Law means not applicable.
そのための手段として、本発明は次の手段を採る。
（１）水をベースとする水系の塗膜剥離剤組成物であって、
二液反応硬化型塗料に対する塗膜剥離性を有する剥離溶剤（Ａ）として、ｐ－メチルアセトフェノン、ジエチレングリコールモノブチルエーテルアセテートのうち、いずれか一方又は双方を含有し、その他の剥離溶剤（Ａ）を実質的に含有しておらず、
前記剥離溶剤（Ａ）を１０～５０重量％含有する、水系塗膜剥離剤組成物。
（２）二液反応硬化型塗料に対する塗膜剥離性を有しない塗膜非剥離性の水溶性補助溶剤（Ｂ）として、３－メトキシ－３－メチル－１－ブタノールを５～６５重量％含有する、（１）に記載の水系塗膜剥離剤組成物。
（３）（１）または（２）に記載の水系塗膜剥離剤組成物を、二液反応硬化型塗料からなる既存塗膜に塗布して該既存塗膜を膨潤軟化させた後、ケレン工具により前記水系塗膜剥離剤組成物と共に前記既存塗膜を掻き落とす、既存塗膜の除去方法。
As a means for that purpose, the present invention adopts the following means.
(1) A water-based paint stripper composition comprising:
As a stripping solvent (A) having paint film stripping properties for two-component reaction curing paints, p-methylacetophenone, diethylene glycol monobutyl ether acetate, containing either one or both, and other stripping solvents (A) does not contain
A water-based paint film remover composition containing 10 to 50% by weight of the remover solvent (A).
(2) Contains 5 to 65% by weight of 3-methoxy-3-methyl-1-butanol as a non-stripping water-soluble co-solvent (B) for two-pack reaction-curing paints. The water-based paint film remover composition according to (1).
(3) The water-based paint film remover composition according to (1) or (2) is applied to an existing paint film made of a two-component reaction curing paint to swell and soften the existing paint film, and then the cleaning tool A method for removing an existing coating film by scraping off the existing coating film together with the aqueous coating film remover composition.
剥離溶剤（Ａ）であるジエチレングリコールモノブチルエーテルアセテートは水に若干可溶である（２０℃における水への溶解度は６．５ｇ／１００ｍｌ程度）が、水系塗膜剥離剤に有効成分として使用するには溶解度が十分でない。一方、剥離溶剤（Ａ）であるｐ－メチルアセトフェノンは水に殆ど溶けない。本発明では、消防法で規定されている非水溶性に該当するものを「水に難溶」と表現する。消防法では、『危険物第四類における水溶性液体とは、１気圧の下で、温度２０℃で同じ容量の純水と緩やかに混合したときに、流動が収まった後も、外観上、均一な状態を維持することができる液体を「水溶性」、そうでない液体を「非水溶性」』と定義されている。 Diethylene glycol monobutyl ether acetate, which is the stripping solvent (A), is slightly soluble in water (solubility in water at 20° C. is about 6.5 g/100 ml). Insufficient solubility. On the other hand, p-methylacetophenone, which is the stripping solvent (A), is almost insoluble in water. In the present invention, a substance corresponding to the water-insoluble specified by the Fire Defense Law is expressed as "poorly soluble in water". According to the Fire Defense Law, "A water-soluble liquid in Class 4 Hazardous Materials shall be mixed gently with the same volume of pure water at a temperature of 20°C under 1 atmospheric pressure, and even after the flow stops, the appearance will be A liquid that can maintain a homogeneous state is defined as "water-soluble", and a liquid that is not "water-insoluble".
また、本発明において「その他の剥離溶剤（Ａ）を実質的に含有していない」とは、本来的にはその他の剥離溶剤（Ａ）を含有していないことを意味するが、ここでは、その他の剥離溶剤（Ａ）を意図的には混用していないことを意味する。例えば、塗膜剥離剤組成物の調製時などに微量のその他の剥離溶剤（Ａ）が不可避的又は不用意に混入したとしても、その混入量は実質的に無視できる程度であって、水系塗膜剥離剤全体としては、製品ラベル表示およびＳＤＳにおいて危険有害性区分の絵表示がないか、感嘆符だけとなり、かつ、消防法の危険物にも該当しない非危険物として扱うことができる程度の量であることを意味する。「実質的に無視できる混入量」とは、具体的には１重量％未満である。これは、労働安全衛生法による表示・通知義務の対象物質において、表示・通知の裾切値が一般的に１重量％未満であることによる。 In the present invention, "substantially free of other release solvents (A)" originally means that no other release solvents (A) are contained. It means that no other release solvent (A) is intentionally mixed. For example, even if a small amount of other stripping solvent (A) is unavoidably or inadvertently mixed during the preparation of the paint film stripping agent composition, the amount of the mixed solvent is substantially negligible, and the water-based coating As a whole film stripping agent, there is no pictorial indication of hazard classification on the product labeling and SDS, or only an exclamation point, and it is a non-dangerous substance that does not fall under the Fire Service Act. It means quantity. The "substantially negligible amount of inclusion" is specifically less than 1% by weight. This is because the threshold value for labeling and notification is generally less than 1% by weight for substances subject to labeling and notification obligations under the Industrial Safety and Health Act.
また、本発明において「塗膜剥離性」とは、既存塗膜を形成する有機樹脂との親和性が高く、水系塗膜剥離剤を既存塗膜へ塗布することで剥離溶剤が既存塗膜に浸透して膨潤軟化させ、既存塗膜の付着力を低下させることで、既存塗膜の除去を容易とする性質を意味する。 In addition, in the present invention, "paint film peelability" means that the affinity with the organic resin that forms the existing paint film is high, and the peeling solvent can be applied to the existing paint film by applying the water-based paint film remover to the existing paint film. It means the property of facilitating the removal of the existing coating film by penetrating, swelling and softening, and reducing the adhesion of the existing coating film.
本発明の水系塗膜剥離剤は、剥離溶剤（Ａ）としてｐ－メチルアセトフェノン及び／又はジエチレングリコールモノブチルエーテルアセテートを使用しており、この剥離溶剤（Ａ）は、表示・通知義務のない物質である。また、その他の剥離溶剤（Ａ）を実質的に含有していない。したがって、本発明の水系塗膜剥離剤は、製品ラベル表示およびＳＤＳにおいて、危険有害性区分の絵表示がないか、感嘆符だけとなり、かつ、消防法の危険物に該当せずに非危険物として取り扱うことができる、危険有害性の低い水系塗膜剥離剤となる。また、本発明で使用する剥離溶剤（Ａ）は、二液反応硬化型塗料からなる既存塗膜に対して良好な塗膜剥離性を有するため、これを有効成分とする水系塗膜剥離剤は、ベンジルアルコールを有効成分とする水系塗膜剥離剤と同等以上の塗膜剥離性を有している。 The water-based coating film remover of the present invention uses p-methylacetophenone and/or diethylene glycol monobutyl ether acetate as the remover solvent (A), and this remover solvent (A) is a substance that does not require labeling/notification. . Moreover, it does not substantially contain other release solvents (A). Therefore, the water-based coating remover of the present invention has no pictorial indication of hazard classification or only an exclamation mark on the product label and SDS, and is not a dangerous substance under the Fire Service Law and is a non-dangerous substance. It becomes a water-based paint stripping agent with low hazards that can be handled as. In addition, since the stripping solvent (A) used in the present invention has good coating film releasability with respect to the existing coating film composed of a two-component reaction curing type paint, a water-based coating film stripping agent containing this as an active ingredient is It has a coating film releasability equal to or greater than that of a water-based coating film remover containing benzyl alcohol as an active ingredient.
剥離溶剤（Ａ）をエマルション化した水系塗膜剥離剤（以下、「エマルション型の水系塗膜剥離剤」と称す）に、粘性を付与するために増粘剤を使用した場合、水系塗膜剥離剤を塗布した後、増粘剤の不溶化によって皮膜化が進行してしまい、これに伴う液相分離と粘度低下を生じることがある。そこで、剥離溶剤（Ａ）との相溶性が良好な水溶性補助溶剤（Ｂ）として、３－メトキシ－３－メチル－１－ブタノールを併用していれば、上記問題を抑制することができる。特に、増粘剤としてアルカリ増粘型の水分散アクリル酸エステル共重合体（以下、「アクリル系増粘剤」と称す）を用いた場合、本発明で使用する水溶性補助溶剤（Ｂ）は、アクリル系増粘剤を適度に溶解する特性を有し、より抑制効果が高くなる。３－メトキシ－３－メチル－１－ブタノールも危険有害性の低い有機溶剤である。 When a thickening agent is used to impart viscosity to a water-based coating remover (hereinafter referred to as an "emulsion-type water-based coating remover") obtained by emulsifying the release solvent (A), the water-based coating removes. After application of the agent, film formation may proceed due to the insolubilization of the thickener, resulting in liquid phase separation and viscosity reduction. Therefore, if 3-methoxy-3-methyl-1-butanol is used in combination as the water-soluble co-solvent (B) having good compatibility with the stripping solvent (A), the above problem can be suppressed. In particular, when an alkali-thickening water-dispersible acrylate copolymer (hereinafter referred to as "acrylic thickener") is used as the thickener, the water-soluble auxiliary solvent (B) used in the present invention is , has the property of moderately dissolving the acrylic thickener, resulting in a higher inhibitory effect. 3-Methoxy-3-methyl-1-butanol is also a less hazardous organic solvent.
また、水溶性補助溶剤（Ｂ）である３－メトキシ－３－メチル－１－ブタノールは、剥離溶剤（Ａ）と水の双方に対して相溶性が良好なので、その配合量によって透明ないし半透明な液状の水系塗膜剥離剤（以下、「水溶液型の水系塗膜剥離剤」と称す）を調製することもできる。この場合、粘性付与のためアクリル系増粘剤を使用した場合、水溶性補助溶剤（Ｂ）はアクリル系増粘剤を適度に溶解し、塩基による中和を要さずに増粘させることができる。 3-Methoxy-3-methyl-1-butanol, which is the water-soluble co-solvent (B), has good compatibility with both the stripping solvent (A) and water, so depending on the amount of the compound, it can be transparent or translucent. A liquid water-based paint film remover (hereinafter referred to as "aqueous water-based paint film remover") can also be prepared. In this case, when an acrylic thickener is used for imparting viscosity, the water-soluble co-solvent (B) can appropriately dissolve the acrylic thickener and increase the viscosity without requiring neutralization with a base. can.
≪水系塗膜剥離剤組成物≫
本発明の水系塗膜剥離剤組成物は、橋梁や鉄塔など鉄鋼製の構造物や建造物などの表面に形成された既存の保護塗膜（既存塗膜）を定期的に塗り替え改修する際に、既存塗膜の除去を化学的に容易にする化学ケレンとして使用されるものである。
≪Water-based paint film remover composition≫
The water-based paint film remover composition of the present invention is used when regularly repainting existing protective paint films (existing paint films) formed on the surface of steel structures such as bridges and steel towers and buildings. , is used as a chemical keren to chemically facilitate the removal of existing coatings.
このとき、塗膜剥離剤には次のような性能が要求される。
１．塗膜剥離性が良好である
２．危険有害性が低い（表示・通知義務の対象物質を実質的に含有しない）
３．低臭気である（作業環境・周辺環境への配慮）
４．引火性が低い（非危険物）
At this time, the paint film remover is required to have the following properties.
1. 1. Good peelability of coating film. Low hazards (substantially does not contain substances subject to labeling/notification obligations)
3. Low odor (consideration for work environment and surrounding environment)
4. Low flammability (non-hazardous)
また、必須性能ではないが、作業効率やコストなどの点において、次のような付随性能も有していることが好ましい。
ア．乾燥が遅い（剥離作用時間を長く確保）
イ．塗布作業性が良好（施工作業性が良好）
ウ．塗れ広がったり、非水平面で垂れ下がったりしない（作業面が限定されない）
エ．材料コストが低廉である（経済性に優れる）
In addition, although it is not an essential performance, it is preferable to have the following accompanying performance in terms of work efficiency and cost.
ah. Drying is slow (ensuring a long peeling action time)
stomach. Good coating workability (good construction workability)
hare. Does not spread or sag on non-horizontal surfaces (work surface is not limited)
workman. Low material cost (excellent economy)
本発明の水系塗膜剥離剤は、水と剥離溶剤（Ａ）とを必須の有効成分として含有し、特定の剥離溶剤（Ａ）以外の剥離溶剤は実質的に含有しない。ここで、剥離溶剤（Ａ）は水に難溶なため、水に対して剥離溶剤（Ａ）の混和安定性を向上するため、もしくは水溶液化するため、任意成分として水溶性補助溶剤（Ｂ）を含有することが好ましい。剥離溶剤（Ａ）に対する水溶性補助溶剤（Ｂ）の含有量に応じて、エマルション型の水系塗膜剥離剤となるか水溶液型の水系塗膜剥離剤となる。 The water-based paint film remover of the present invention contains water and a remover solvent (A) as essential active ingredients, and does not substantially contain any remover solvent other than the specific remover solvent (A). Here, since the release solvent (A) is sparingly soluble in water, in order to improve the mixing stability of the release solvent (A) with water or to form an aqueous solution, a water-soluble auxiliary solvent (B) is added as an optional component. It is preferable to contain Depending on the content of the water-soluble auxiliary solvent (B) with respect to the stripping solvent (A), it becomes either an emulsion type water-based paint remover or an aqueous solution type water-based paint remover.
＜水＞
水系塗膜剥離剤は、水をベースとして一定量含有することにより、引火点を有する有機溶剤を含有しても、引火点測定により引火点を生じず、非危険物として取り扱うことができる。
<Water>
By containing a certain amount of water as a base, the water-based paint film remover does not produce a flash point by flash point measurement even if it contains an organic solvent having a flash point, and can be handled as a non-hazardous material.
水系塗膜剥離剤に対して後述する添加剤を必要に応じて添加する場合、当該添加剤をエマルションの状態で添加する場合は、ベースとする水を積極的に配合せずとも、添加するエマルション中の水をベースとして使用することもできる。例えば、エマルション状のアクリル系増粘剤を添加する場合は、当該エマルション状のアクリル系増粘剤に含まれている水の量も考慮して、水系塗膜剥離剤全体の水の含有量を調整する。なお、水はベース成分であるが、必ずしも最大含有量成分ではない。 If the additive described later is added to the water-based paint film stripping agent as necessary, and if the additive is added in the form of an emulsion, the emulsion to be added without actively blending water as a base The water in it can also be used as a base. For example, when adding an emulsion-like acrylic thickener, consider the amount of water contained in the emulsion-like acrylic thickener, and the water content of the entire water-based paint remover. adjust. Although water is a base component, it is not necessarily the highest content component.
＜剥離溶剤（Ａ）＞
剥離溶剤（Ａ）は、既存塗膜を形成する有機樹脂との親和性の高い有機溶剤であり、既存塗膜に浸透して膨潤軟化させ、その付着力を低下させることで、既存塗膜の除去を容易ならしめるものである。特に、塗料の中でも剥離が困難な部類の二液反応硬化形塗料に対して、現在多用されているベンジルアルコールと同等以上の塗膜剥離性を有する有機溶剤が好ましい。そのうえで、危険有害性が低いことの指標として、表示・通知義務の対象物質ではないことが必要である。また、剥離作用時間を長く確保できる観点から、蒸発が遅いほうが良く、その指標として沸点１５０℃以上であるものが好ましい。さらに、水の共存下で引火点を生じず、その指標として引火点６０℃以上であるものが好ましい。なお、剥離溶剤（Ａ）は有機樹脂との親和性が高いため水には難溶であるが、逆に、そのほうが水に乳化させやすく、エマルション状に調製するには適している。このため、剥離溶剤（Ａ）は、消防法における危険物第四類の非水溶性液体であるものがより好ましい。
<Release solvent (A)>
The stripping solvent (A) is an organic solvent that has a high affinity with the organic resin that forms the existing coating film. It facilitates removal. In particular, for two-part reaction curing paints, which are difficult to remove among paints, an organic solvent having paint film peelability equal to or greater than that of benzyl alcohol, which is widely used at present, is preferable. On top of that, as an indicator of low hazards, it is necessary that the substance is not subject to labeling/notification obligations. In addition, from the viewpoint of securing a long peeling action time, it is preferable that the evaporation is slow, and as an index thereof, a boiling point of 150° C. or higher is preferable. Furthermore, it is preferable that the flash point is 60° C. or higher as an indicator of the flash point that does not occur in the coexistence of water. The release solvent (A) has a high affinity with organic resins and is sparingly soluble in water. For this reason, the stripping solvent (A) is more preferably a water-insoluble liquid classified as Class 4 hazardous materials under the Fire Defense Law.
本発明では、このような剥離溶剤（Ａ）として、ｐ－メチルアセトフェノン及びジエチレングリコールモノブチルエーテルアセテート（ＢＤＧＡｃ）のみが適していることを、数多くある有機溶剤の中から見出した。中でも、ジエチレングリコールモノブチルエーテルアセテートは極めて低臭気であるため、より好ましい。これらの剥離溶剤（Ａ）は、いずれか一方を単独で使用してもよいし、両者を併用してもよい。 In the present invention, among many organic solvents, it was found that only p-methylacetophenone and diethylene glycol monobutyl ether acetate (BDGAc) are suitable as the stripping solvent (A). Among them, diethylene glycol monobutyl ether acetate is more preferable because of its extremely low odor. Either one of these release solvents (A) may be used alone, or both may be used in combination.
水系塗膜剥離剤中における剥離溶剤（Ａ）の含有量は１０～５０重量％、好ましくは１５～４５重量％とする。剥離溶剤（Ａ）の含有量が１０重量％未満の場合は塗膜剥離性に課題を有する可能性があり、５０重量％を超えると水系塗膜剥離剤の調製が困難となり、安定性も損なわれる可能性がある。 The content of the stripping solvent (A) in the water-based paint film stripping agent is 10 to 50% by weight, preferably 15 to 45% by weight. If the content of the stripping solvent (A) is less than 10% by weight, there is a possibility that there will be a problem with the peelability of the coating film. There is a possibility that
＜水溶性補助溶剤（Ｂ）＞
水溶性補助溶剤（Ｂ）は、エマルション型および水溶液型のいずれの水系塗膜剥離剤においても有用な成分である。エマルション型では、水系塗膜剥離剤の塗付後、経時的な水の蒸発に伴い、増粘剤の不溶化による皮膜化が進行し、粘度低下を生じる。これにより、混和安定性が損なわれ、剥離溶剤（Ａ）と水の液相分離を生じるおそれがある。水溶性補助溶剤（Ｂ）は、エマルション型の水系塗膜剥離剤に含有することで、剥離溶剤（Ａ）と水の液相分離を抑制するものである。
<Water-soluble auxiliary solvent (B)>
The water-soluble co-solvent (B) is a useful component in both emulsion-type and aqueous-based water-based coating film removers. In the emulsion type, as the water evaporates over time after the application of the water-based paint film remover, film formation progresses due to insolubilization of the thickener, resulting in a decrease in viscosity. This may impair the mixing stability and cause liquid phase separation between the stripping solvent (A) and water. The water-soluble auxiliary solvent (B) is contained in the emulsion-type water-based coating film remover to suppress liquid phase separation between the remover solvent (A) and water.
また、乳化分散と粘性付与のためにアクリル系増粘剤を使用した場合、水溶性補助溶剤（Ｂ）は適度にアクリル系増粘剤を溶解するものであり、アクリル系増粘剤の不溶化による粘度低下を抑制できる。 In addition, when an acrylic thickener is used for emulsification dispersion and viscosity imparting, the water-soluble auxiliary solvent (B) moderately dissolves the acrylic thickener. Viscosity reduction can be suppressed.
また、水溶性補助溶剤（Ｂ）は、水に難溶な剥離溶剤（Ａ）を水溶液化して水溶液型の水系塗膜剥離剤として調整することもできる。特に増粘剤としてアクリル系増粘剤を使用した場合、水溶性補助溶剤（Ｂ）はアクリル系増粘剤を適度に溶解し、塩基による中和を要さずに増粘させる特性を有する。これにより、水溶液型の水系塗膜剥離剤に粘性を付与することができる。 The water-soluble auxiliary solvent (B) can also be prepared as an aqueous solution-type coating film remover by turning the sparingly water-soluble remover solvent (A) into an aqueous solution. In particular, when an acrylic thickener is used as the thickener, the water-soluble co-solvent (B) has the property of appropriately dissolving the acrylic thickener and increasing the viscosity without requiring neutralization with a base. This makes it possible to impart viscosity to the aqueous solution type water-based paint film remover.
水溶性補助溶剤（Ｂ）は、消防法における危険物第四類の水溶性液体であり、剥離溶剤（Ａ）との相溶性が良好なものである。また、水溶性補助溶剤（Ｂ）は、水系塗膜剥離剤の剥離作用時間を長く確保できる指標として、沸点１５０℃以上であり、蒸発が遅いものが好ましい。さらに、水溶性補助溶剤（Ｂ）は、危険有害性が低いことの指標として、表示・通知義務の対象物質ではないものが好ましい。加えて、水溶性補助溶剤（Ｂ）は、一定量の水の共存下で引火点を生じず、その指標として引火点６０℃以上であるものがより好ましい。なお、水溶性補助溶剤（Ｂ）は、既存塗膜を形成する有機樹脂との親和性が低いため、二液反応硬化形塗料に対する塗膜剥離性は有しない（塗膜非剥離性）。 The water-soluble auxiliary solvent (B) is a water-soluble liquid classified as Class 4 hazardous materials under the Fire Defense Law, and has good compatibility with the stripping solvent (A). Further, the water-soluble auxiliary solvent (B) preferably has a boiling point of 150° C. or higher and slow evaporation, as an index for ensuring a long peeling action time of the water-based paint film remover. Furthermore, the water-soluble co-solvent (B) is preferably a substance that is not subject to labeling/notification obligations as an index of low hazards. In addition, the water-soluble co-solvent (B) does not produce a flash point in the presence of a certain amount of water, and more preferably has a flash point of 60°C or higher as an indicator. Since the water-soluble co-solvent (B) has a low affinity with the organic resin forming the existing coating film, it does not have coating film releasability (coating film non-releasing property) with respect to the two-pack reaction curing paint.
本発明では、このような水溶性補助溶剤（Ｂ）として、３－メトキシ－３－メチル－１－ブタノールが最も適していることを、数多くある有機溶剤の中から見出した。 In the present invention, among many organic solvents, 3-methoxy-3-methyl-1-butanol was found to be most suitable as such a water-soluble co-solvent (B).
水系塗膜剥離剤中における水溶性補助溶剤（Ｂ）の含有量は５～６５重量％、好ましくは１０～６０重量％とする。水溶性補助溶剤（Ｂ）の含有量が２５重量％以下（好ましくは２０重量％以下）の範囲では水系塗膜剥離剤はエマルション型となり、４０重量％以上（好ましくは４５重量％以上）の範囲では水溶液型となり、２５重量％を超え４０重量％未満では、水や剥離溶剤（Ａ）等の含有量によってエマルション型となったり水溶液型となったりする。なお、剥離溶剤（Ａ）と水溶性補助溶剤（Ｂ）との合計含有量は、８５重量％以下が好ましく、８０重量％以下がより好ましい。 The content of the water-soluble auxiliary solvent (B) in the water-based paint film remover is 5-65% by weight, preferably 10-60% by weight. When the content of the water-soluble auxiliary solvent (B) is in the range of 25% by weight or less (preferably 20% by weight or less), the water-based paint film remover becomes an emulsion type, and in the range of 40% by weight or more (preferably 45% by weight or more). At more than 25% by weight but less than 40% by weight, it becomes an emulsion type or an aqueous solution type depending on the content of water, the release solvent (A), and the like. The total content of the release solvent (A) and the water-soluble auxiliary solvent (B) is preferably 85% by weight or less, more preferably 80% by weight or less.
＜添加剤＞
（増粘剤）
本発明の水系塗膜剥離剤には、粘性付与を目的として、有機系および無機系の増粘剤を添加することもできる。有機系増粘剤としては、アクリル系増粘剤のほか、カルボキメチルセルロース、メチルセルロース、ヒドロキシエチルセルロース、グアーガム、カラギーナン、アルギン酸ナトリウム、コーンスターチ、キサンタンガム、カチオン化グアーガム、カルボキシビニルポリマー、ポリビニルピロリドン、及びポリビニルアルコールなどが挙げられる。
<Additive>
(thickener)
An organic or inorganic thickener may be added to the water-based coating film-stripping agent of the present invention for the purpose of imparting viscosity. Examples of organic thickeners include acrylic thickeners, carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, guar gum, carrageenan, sodium alginate, corn starch, xanthan gum, cationized guar gum, carboxyvinyl polymer, polyvinylpyrrolidone, and polyvinyl alcohol. is mentioned.
アクリル系増粘剤としては、アルカリ増粘型のアクリル酸エステル共重合体を挙げることができる。アクリル系増粘剤は、通常エマルション状で市販されている。市販品としては、ダウ・ケミカル日本（株）製の「プライマルＡＳＥ－６０」や、中部サイデン（株）製の「バンスターＳ１００」などが好適である。 Examples of acrylic thickeners include alkali-thickening acrylate copolymers. Acrylic thickeners are usually commercially available in the form of emulsions. Commercially available products such as “Primal ASE-60” manufactured by Dow Chemical Japan Co., Ltd. and “Banstar S100” manufactured by Chubu Saiden Co., Ltd. are suitable.
無機系増粘剤としては、カオリナイト、スメクタイト、シリカ、雲母、及びセピオライトなどが挙げられる。上記各増粘剤は、単独で使用しても複数を混用しても良い。 Inorganic thickeners include kaolinite, smectite, silica, mica, and sepiolite. Each of the above thickeners may be used alone or in combination.
中でも、アクリル系増粘剤が好ましい。エマルション型の水系塗膜剥離剤では、アクリル系増粘剤を使用した場合、塩基による中和により剥離溶剤（Ａ）の乳化を伴いながらアクリル系増粘剤が水溶化するため、乳化剤を必要とせずに安定なエマルションを容易に形成しながら増粘することができる。これにより、ローラー塗り、はけ塗り、吹付塗りなどの塗布作業性に優れ、塗れ広がりにくく、非水平面でも塗布直後に垂れにくい粘性の水系塗膜剥離剤が得られる。 Among them, an acrylic thickener is preferable. When an acrylic thickener is used in the emulsion-type water-based paint film remover, neutralization with a base causes the acrylic thickener to become water-soluble while emulsifying the release solvent (A), so an emulsifier is not required. It is possible to thicken while easily forming a stable emulsion without As a result, it is possible to obtain a viscous water-based paint film remover which is excellent in coating workability such as roller coating, brush coating, and spray coating, which is difficult to spread, and which is resistant to sagging even on non-horizontal surfaces immediately after coating.
増粘剤を添加する場合、水系塗膜剥離剤中における増粘剤の含有量は、固形分換算で０．５～８重量％が好ましく、１～７重量％がより好ましく、２～６重量％がさらに好ましい。増粘剤の含有量が固形分換算で０．５重量％未満の場合は、水系塗膜剥離剤の増粘が不十分となる可能性がある。また、固形分換算で８重量％を超えると、水系塗膜剥離剤の調製が困難となる可能性がある。 When a thickener is added, the content of the thickener in the water-based paint film remover is preferably 0.5 to 8% by weight, more preferably 1 to 7% by weight, and 2 to 6% by weight in terms of solid content. % is more preferred. If the content of the thickener is less than 0.5% by weight in terms of solid content, the thickening of the water-based paint film-stripping agent may be insufficient. Moreover, if it exceeds 8% by weight in terms of solid content, it may become difficult to prepare a water-based paint film remover.
水溶液型の水系塗膜剥離剤では、エマルション状のアクリル系増粘剤を使用した場合、アクリル系増粘剤が剥離溶剤（Ａ）に適度に溶解するため、塩基を使用しなくても増粘する。一方、エマルション型の水系塗膜剥離剤においては、アクリル系増粘剤を用いた場合、塩基が必須成分となる。 In aqueous solution type water-based paint film remover, when an emulsion-like acrylic thickener is used, the acrylic thickener dissolves appropriately in the remover solvent (A), so the viscosity can be increased without using a base. do. On the other hand, in emulsion-type water-based coating film removers, a base is an essential component when an acrylic thickener is used.
塩基としては、アルカリ性を示す水溶性塩基性物質を挙げることができる。具体的には、水酸化ナトリウム、水酸化カリウム等のアルカリ金属水酸化物／炭酸カリウム、炭酸ナトリウム等のアルカリ金属炭酸塩／アンモニア／モノメチルアミン、ジメチルアミン、トリエチルアミン、モノエチルアミン、ジエチルアミン、モノエタノールアミン、ジエタノールアミン、トリエタノールアミン等のアミン類／アミノメチルプロパノール（２－アミノ－２－メチル－１－プロパノール）、トリスヒドロキシメチルアミノメタン、アルギニン、リジン等の塩基性アミノ酸／アミノエチルプロパノールアミン、アミノメチルプロパンジオール、アミノエチルプロパンジオール等を挙げることができる。これら塩基は、単独で使用しても複数を混用しても良く、水系塗膜剥離剤の危険有害性を損なわない限度で使用できる。中でも、微量で中和作用を有し、残留性のないアンモニア水が好ましい。 Examples of bases include water-soluble basic substances exhibiting alkalinity. Specifically, alkali metal hydroxides such as sodium hydroxide and potassium hydroxide/alkali metal carbonates such as potassium carbonate and sodium carbonate/ammonia/monomethylamine, dimethylamine, triethylamine, monoethylamine, diethylamine, monoethanolamine , diethanolamine, triethanolamine and other amines / aminomethylpropanol (2-amino-2-methyl-1-propanol), trishydroxymethylaminomethane, arginine, lysine and other basic amino acids / aminoethylpropanolamine, aminomethyl Propanediol, aminoethylpropanediol and the like can be mentioned. These bases may be used singly or in combination, and can be used as long as they do not impair the hazards of the water-based paint remover. Among them, ammonia water, which has a neutralizing action even in a very small amount and does not remain, is preferable.
塩基を添加する場合は、アクリル系増粘剤を含有する水系塗膜剥離剤組成物１００重量部に対して０．１～１．０重量部が好ましい。 When a base is added, it is preferably added in an amount of 0.1 to 1.0 parts by weight per 100 parts by weight of the water-based coating remover composition containing the acrylic thickener.
（乾燥遅延剤）
本発明による水系塗膜剥離剤は、水系塗膜剥離剤の乾燥を遅延させ、剥離作用時間をより長く確保するための乾燥遅延剤を添加することもできる。乾燥遅延剤は、乾燥遅延効果の指標として沸点１５０℃以上であり、蒸発が遅いものが好ましい。同時に、危険有害性が低いことの指標として、表示・通知義務の対象物質ではないものとする。加えて、一定量の水の共存下で引火点を生じず、その指標として引火点６０℃以上であるものが好ましい。
(drying retardant)
A drying retardant may be added to the water-based paint film-removing agent according to the present invention to delay the drying of the water-based paint film-removing agent and ensure a longer peeling action time. The drying retardant preferably has a boiling point of 150° C. or higher as an index of the drying retarding effect and is slow to evaporate. At the same time, as an indicator of low hazards, substances shall not be subject to labeling/notification obligations. In addition, it is preferable to have a flash point of 60° C. or higher as an index that does not generate a flash point in the coexistence of a certain amount of water.
このような乾燥遅延剤としては、プロピレングリコール、トリエチレングリコール、グリセロール、トリエチレングリコールモノメチルエーテル、ジプロピレングリコール、３－フェニル－１－プロパノール、１－フェニル－１－プロパノール、１－フェニル－２－プロパノール、フェノキシエタノール、１－フェノキシ－２－プロパノール、２－フェノキシプロパノール、３－フェノキシ－１－プロパノール、１－ブトキシ－２－プロパノール、酢酸３－メトキシ－３－メチルブチル、ＤＢＥ二塩基酸エステル（混合物）、こはく酸ジエチル、多価アルコールにプロピレンオキサイドやエチレンオキサイド等のアルキレンオキサイドを付加重合させたポリオール類などが挙げられる。これらの乾燥遅延剤は単独で使用することができ、複数を併用しても良い。なお、これらの乾燥遅延剤は、既存塗膜を形成する有機樹脂との親和性が低いため、二液反応硬化形塗料に対する塗膜剥離性は有しない（塗膜非剥離性）。 Such drying retardants include propylene glycol, triethylene glycol, glycerol, triethylene glycol monomethyl ether, dipropylene glycol, 3-phenyl-1-propanol, 1-phenyl-1-propanol, 1-phenyl-2- Propanol, phenoxyethanol, 1-phenoxy-2-propanol, 2-phenoxypropanol, 3-phenoxy-1-propanol, 1-butoxy-2-propanol, 3-methoxy-3-methylbutyl acetate, DBE dibasic acid ester (mixture) , diethyl succinate, and polyols obtained by addition polymerization of alkylene oxides such as propylene oxide and ethylene oxide to polyhydric alcohols. These drying retardants may be used alone, or may be used in combination. Since these drying retarders have low affinity with the organic resin forming the existing coating film, they do not have coating film releasability (coating film non-releasing property) with respect to the two-pack reaction curing type paint.
乾燥遅延剤を添加する場合、水系塗膜剥離剤組成物１００重量部に対して１～１０重量部が好ましく、２～８重量部がより好ましい。乾燥遅延剤の含有量が１重量部未満の場合は、乾燥遅延効果が不十分となる可能性がある。また、１０重量部を超えると、剥離溶剤（Ａ）の含有量が相対的に減少し、水系塗膜剥離剤の塗膜剥離性が低下する可能性がある。 When a drying retarder is added, it is preferably 1 to 10 parts by weight, more preferably 2 to 8 parts by weight, per 100 parts by weight of the water-based paint film-stripping composition. If the content of the drying retardant is less than 1 part by weight, the drying retarding effect may be insufficient. On the other hand, if it exceeds 10 parts by weight, the content of the stripping solvent (A) is relatively decreased, and there is a possibility that the coating strippability of the water-based coating stripping agent is lowered.
（その他の添加剤）
本発明の水系塗膜剥離剤には、水系塗膜剥離剤の作用効果を著しく阻害せず、かつ、危険有害性を損なわない限度で、乳化剤、分散剤、湿潤剤、着色顔料、体質顔料、防錆顔料、染料、防腐剤、防カビ剤、消泡剤、初期防錆剤、芳香剤、および蛍光増白剤などの添加剤を、必要に応じて添加することができる。
(Other additives)
The water-based paint film remover of the present invention contains emulsifiers, dispersants, wetting agents, coloring pigments, extender pigments, as long as they do not significantly impair the effects of the water-based paint film remover and do not impair hazards. Additives such as antirust pigments, dyes, preservatives, mildew inhibitors, defoamers, initial rust inhibitors, fragrances, and optical brighteners can be added as needed.
≪水系塗膜剥離剤の調製方法≫
本発明の水性塗膜剥離剤の調製方法は特に限定されず、公知の各種混合機を用い、撹拌混合することにより調製できる。例えば、水系塗膜剥離剤をエマルション型とする場合、水と剥離溶剤（Ａ）との混合液に、必要に応じて水溶性補助溶剤（Ｂ）や添加剤を加えて撹拌混合し、剥離溶剤（Ａ）が微粒子となるように乳化分散させればよい。アクリル系増粘剤を添加した場合は、塩基を加えてアクリル系増粘剤を中和し、溶解増粘させながらさらに撹拌混合する。一方、水系塗膜剥離剤を水溶液型とする場合、剥離溶剤（Ａ）を撹拌しながら水及び水溶性補助溶剤（Ｂ）を加えて溶解させ、さらに必要に応じて添加剤を加えて撹拌混合することで、透明液状または半透明液状の水性塗膜剥離剤が調製される。
≪Method for preparing water-based paint film remover≫
The preparation method of the water-based paint film remover of the present invention is not particularly limited, and it can be prepared by stirring and mixing using various known mixers. For example, when the water-based paint film remover is an emulsion type, the water-soluble auxiliary solvent (B) and additives are added to the mixed solution of water and the remover solvent (A), if necessary, and the mixture is stirred to obtain the remover solvent. (A) may be emulsified and dispersed to form fine particles. When an acrylic thickener is added, a base is added to neutralize the acrylic thickener, and the mixture is further stirred and mixed while being dissolved and thickened. On the other hand, when the water-based paint film remover is an aqueous solution, water and the water-soluble auxiliary solvent (B) are added to dissolve the remover solvent (A) while stirring, and if necessary, additives are added and mixed with stirring. By doing so, a transparent liquid or translucent liquid aqueous coating film-stripping agent is prepared.
≪既存塗膜の除去方法≫
最初に、水系塗膜剥離剤を剥離対象となる既存塗膜上に塗布する。塗布方法は特に限定されず、代表的には植毛ローラーや多孔質スポンジローラーなどを用いたローラー塗布のほか、刷毛塗り、およびスプレーや噴射機などを用いた噴射塗布などを例示できる。このとき、水系塗膜剥離剤は適度に流動性が抑制された粘度を有するため、塗布面に付着したまま留まる。水系塗膜剥離剤の塗布量は０．３～１．２ｋｇ／ｍ２ を目安とすればよく、通常は０．５～１．０ｋｇ／ｍ２ とすることが好ましい。塗布量が０．３ｋｇ／ｍ２未満では剥離作用が不十分となり、１．２ｋｇ／ｍ２超では非水平面での水系塗膜剥離剤の垂れ下がりを生じやすくなる傾向がある。
≪How to remove the existing paint film≫
First, a water-based paint remover is applied onto the existing paint to be removed. The coating method is not particularly limited, and typical examples include roller coating using a flocked roller or porous sponge roller, brush coating, and injection coating using a spray or injector. At this time, since the water-based paint film remover has a viscosity with moderately suppressed fluidity, it stays attached to the coated surface. The coating amount of the water-based paint film remover may be 0.3 to 1.2 kg/m 2 as a guideline, and usually preferably 0.5 to 1.0 kg/m 2 . If the coating amount is less than 0.3 kg/m 2 , the stripping action will be insufficient, and if it exceeds 1.2 kg/m 2 , the water-based paint film stripping agent tends to sag on non-horizontal surfaces.
水系塗膜剥離剤による剥離作用は、塗膜剥離性を有する剥離溶剤（Ａ）が既存塗膜の表面に接触し、さらに既存塗膜中に浸透して膨潤軟化させ、既存塗膜の付着力を低下させる。本発明による水系塗膜剥離剤は、有効成分の蒸発が著しく遅いため、標準的な作業環境下では、剥離作用時間を長く確保できる。ただし、作業環境が高温、低湿度または通風過多などのため、水系塗膜剥離剤中の成分が急速に蒸発し、剥離作用時間を十分確保できない場合は、塗布面にビニルシートなどの乾燥防止シートを覆い被せることで、水性湿潤剤中の成分蒸発を抑制できる。水系塗膜剥離剤による剥離作用時間は、既存塗膜の種類、膜厚および作業環境などに応じて適宜調整すればよく、エポキシ樹脂塗料やポリウレタン樹脂塗料のような二液反応硬化形塗料の場合、２３℃の標準温度であれば４～１６時間を目安とする。 The peeling action of the water-based paint film remover is that the peeling solvent (A) having paint film peeling properties contacts the surface of the existing paint film, further penetrates into the existing paint film, swells and softens, and the adhesion of the existing paint film lower the Since the water-based paint film remover according to the present invention evaporates extremely slowly, it can ensure a long peeling action time under standard working conditions. However, if the working environment is high temperature, low humidity, or excessive ventilation, the ingredients in the water-based paint film remover will evaporate rapidly, and if it is not possible to secure a sufficient time for the removal action, a drying prevention sheet such as a vinyl sheet should be applied to the coating surface. can suppress evaporation of components in the aqueous wetting agent. The release action time of the water-based paint film remover can be adjusted appropriately according to the type of existing paint film, film thickness and work environment. , 4 to 16 hours at a standard temperature of 23°C.
最後に塗膜の掻き落とし作業を実施する。水系塗膜剥離剤の剥離作用によって膨潤軟化し付着力の低下した既存塗膜を、スクレーパー、ヘラ、皮スキなどのケレン工具を使用して掻き落とし、除去する。膜厚が厚いために水系塗膜剥離剤の剥離作用が深部まで届かず、掻き落とすのが困難な残存塗膜は、無理やり掻き落とさなくとも、再度、水系塗膜剥離剤を塗布し、掻き落としが容易となってから実施すればよい。 Finally, the paint film is scraped off. The existing paint film, which has been swollen and softened due to the peeling action of the water-based paint film remover and has reduced adhesion, is scraped off and removed using a scraping tool such as a scraper, a spatula, and a skin scraper. Due to the thickness of the film, the peeling action of the water-based paint remover does not reach deep areas, and the remaining paint is difficult to scrape off. should be implemented after it becomes easier.
本発明による既存塗膜の除去方法は、エポキシ樹脂塗料やポリウレタン樹脂塗料のように、塗料の中でも特に剥離が困難な部類の二液反応硬化形塗料に対して特に有効なものであるが、これに限られるものではなく、一液型か二液型を問わず他の樹脂系塗料からなる塗膜に対しても有効なものである。 The method for removing an existing paint film according to the present invention is particularly effective for two-part reaction curing paints, such as epoxy resin paints and polyurethane resin paints, which are particularly difficult to peel off. It is also effective for coating films made of other resin-based paints, regardless of whether they are one-pack type or two-pack type.
以下に、本発明を具体化した実施例について説明するが、本発明は以下の実施例に限定されるものではない。
≪水系塗膜剥離剤の調製≫
本発明による水系塗膜剥離剤の諸特性を評価するため、実施例及び比較例に用いた剥離溶剤（Ａ）及び水溶性補助溶剤（Ｂ）を表１に示す。剥離溶剤（Ａ）としては、非水溶性液体で、沸点１５０℃以上かつ引火点６０℃以上のものとし、さらにベンジルアルコール以外は表示・通知義務の対象物質ではないものを選定した。水溶性補助溶剤（Ｂ）としては、水溶性液体で、沸点１５０℃以上かつ引火点６０℃以上のものとし、さらに表示・通知義務の対象物質ではないものを選定した。
EXAMPLES Examples embodying the present invention will be described below, but the present invention is not limited to the following examples.
≪Preparation of water-based coating remover≫
Table 1 shows the stripping solvent (A) and the water-soluble auxiliary solvent (B) used in Examples and Comparative Examples in order to evaluate various properties of the water-based paint film stripping agent according to the present invention. As the stripping solvent (A), a non-aqueous liquid having a boiling point of 150° C. or higher and a flash point of 60° C. or higher was selected. As the water-soluble co-solvent (B), a water-soluble liquid having a boiling point of 150° C. or higher and a flash point of 60° C. or higher and not subject to labeling and notification obligations was selected.
※２：消防法が規定する危険物第四類における水溶性液体への該非
表１の溶剤を用い、表２及び表３に示す組成（配合量の数値は重量部）で、容器に順次添加しながら撹拌機により混合し、実施例１～１１及び比較例１～９の水系塗膜剥離剤を調製した。なお、表２及び表３において、増粘剤ａの含有量はエマルションとしての配合量を記載している。 Using the solvents in Table 1, the compositions shown in Tables 2 and 3 (numerical values for the amounts are parts by weight) were mixed with a stirrer while being sequentially added to the container, and the results of Examples 1 to 11 and Comparative Examples 1 to 9 were obtained. A water-based paint stripper was prepared. In addition, in Tables 2 and 3, the content of the thickener a is the blending amount as an emulsion.
表２及び表３に示す溶剤以外の各材料としては、次のものを使用した。
増粘剤ａ：アクリル系増粘剤エマルションである中部サイデン株式会社製「バンスターＳ１００」（固形分３０％）
増粘剤ｂ：セルロース系増粘剤であるアシュランド・ジャパン株式会社製「ナトロゾール ２５０ＨＲ ヒドロキシエチルセルロース」（固形分１００％）
塩基：後藤化学株式会社製「２５％アンモニア水」
As each material other than the solvent shown in Tables 2 and 3, the following were used.
Thickener a: "Banstar S100" manufactured by Chubu Saiden Co., Ltd., an acrylic thickener emulsion (solid content 30%)
Thickener b: "Natrosol 250HR Hydroxyethyl Cellulose" manufactured by Ashland Japan Co., Ltd., a cellulose-based thickener (solid content 100%)
Base: "25% ammonia water" manufactured by Goto Chemical Co., Ltd.
＜評価方法＞
実施例及び比較例の評価結果も表２及び表３に示す。各評価項目における評価方法を以下に示す。
（ＧＨＳによる危険有害性区分の絵表示）
ＧＨＳの分類基準に従って危険有害性区分を決定する。それらの区分を象徴する絵表示（呼び名）は、以下のアルファベット記号で代用する。
健康有害性：Ｈ
感嘆符：Ｅ
なし：Ｎ
<Evaluation method>
Evaluation results of Examples and Comparative Examples are also shown in Tables 2 and 3. The evaluation method for each evaluation item is shown below.
(Pictorial indication of hazard classification according to GHS)
Determine the hazard category according to the GHS classification criteria. Pictograms (names) that symbolize these categories are substituted with the following alphabetical symbols.
Health Hazard: H
Exclamation point: E
None: N
（引火点）
セタ密閉式引火点試験器を用い、９３℃まで昇温させて引火点を測定し、引火しない場合は「なし」、引火する場合は「あり」と表記する。
(flash point)
Using a seta closed flash point tester, the temperature is raised to 93°C and the flash point is measured.
（塗膜剥離性）
基材としてＪＩＳ Ｇ ３１４１に規定するＳＰＣＣ－ＳＢ鋼板（厚さ１ｍｍ）を使用した。これに弱溶剤２液形エポキシ樹脂系さび止め塗料である「ワイドラスノンＥＰＯ」（グレー色、スズカファイン株式会社製）をスプレー塗りにより１回塗布し（０．２０ｋｇ／ｍ２／回）、２３℃で２４時間乾燥した。さらに、弱溶剤２液形エポキシ変性ポリウレタン樹脂系塗料である「ワイドエポーレＵ」（白色、スズカファイン株式会社製）をスプレー塗りにより２回塗布し（０．１５ｋｇ／ｍ２／回、塗装間隔４時間）、２３℃で7日間乾燥したものを試験体とした。
(Paint peelability)
An SPCC-SB steel plate (thickness 1 mm) specified in JIS G 3141 was used as the base material. A weak solvent two-liquid type epoxy resin anticorrosive paint "Wide Lath Non EPO" (gray, manufactured by Suzuka Fine Co., Ltd.) was applied once by spraying (0.20 kg/m 2 /time). It was dried at 23°C for 24 hours. Furthermore, "Wide Epore U" (white, manufactured by Suzuka Fine Co., Ltd.), which is a weak solvent two-component epoxy-modified polyurethane resin paint, was applied twice by spraying (0.15 kg/m 2 /time, coating interval 4 hours). ) and dried at 23° C. for 7 days to obtain test specimens.
試験体を水平に設置し、試験体の一部分に、実施例及び比較例の水系塗膜剥離剤を刷毛で塗布し（１．０ｋｇ／ｍ２）、２３℃で２４時間放置した後、試験体塗膜の浮き上がりによる自発的な剥離が生じていることと、これが生じていない場合は鋭利な皮すきの角で水系塗膜剥離剤の塗布部を基材に届くように３回突くことで、３０分以内に試験体塗膜の浮き上がりによる剥離が生じることを、以下の基準で評価する。
○：試験体塗膜の浮き上がりによる剥離が生じる。
×：試験体塗膜の浮き上がりによる剥離が生じない。
The test piece was placed horizontally, and the water-based paint film remover of Examples and Comparative Examples was applied to a portion of the test piece with a brush (1.0 kg/m 2 ), left at 23°C for 24 hours, and then the test piece Spontaneous peeling due to the lifting of the paint film occurs, and if this does not occur, by poking the applied part of the water-based paint remover with a sharp edge of the skin three times so as to reach the substrate, The following criteria are used to evaluate the occurrence of peeling due to lifting of the coating film of the specimen within 30 minutes.
◯: Delamination due to lifting of the coating film on the specimen occurs.
x: Peeling due to floating of the coating film on the specimen does not occur.
表２の結果から、本発明が規定する条件を満たす実施例１～１１では、表示・通知義務の対象物質を含有しておらず、ＧＨＳによる危険有害性区分の絵表示はないか、感嘆符だけとなり、人体や環境に対して有害性が低い。また、引火点もないことから、火災を引き起こす危険性も低く、実施例１～１１は危険有害性の低い水系塗膜剥離剤である。さらに、実施例１～１１は、エポキシ樹脂塗料やポリウレタン樹脂塗料のように、塗料の中でも架橋度が高く、剥離が困難な部類の二液反応硬化形塗料に対して塗膜剥離性が良好であるため、ベンジルアルコールを有効成分とする水系塗膜剥離剤と遜色のない実用性を有する。 From the results in Table 2, Examples 1 to 11 that satisfy the conditions stipulated by the present invention do not contain substances subject to labeling/notification obligations, and there are no GHS hazard classification pictograms or exclamation marks. , which is less harmful to humans and the environment. In addition, since there is no flash point, the risk of causing fire is also low, and Examples 1 to 11 are water-based coating film removers with low hazards. Furthermore, Examples 1 to 11 show good coating film peelability for two-liquid reaction curable coatings, such as epoxy resin coatings and polyurethane resin coatings, which have a high degree of cross-linking and are difficult to peel off. Therefore, it has practicality comparable to a water-based paint film remover containing benzyl alcohol as an active ingredient.
一方、表３の比較例１～５および比較例８は塗膜剥離性が不十分であり、比較例６と比較例７は均質な水系塗膜剥離剤を調製できなかったため、各項目の評価は実施しなかった。また、ベンジルアルコールを有効成分とする比較例４、９は、ＧＨＳによる危険有害性区分の絵表示が、感嘆符に加えて健康有害性の表記が必要となり、使用が制限される。
On the other hand, Comparative Examples 1 to 5 and Comparative Example 8 in Table 3 had insufficient paint film removability, and Comparative Examples 6 and 7 could not prepare a homogeneous water-based paint film remover, so evaluation of each item was not implemented. Further, in Comparative Examples 4 and 9, in which benzyl alcohol is used as an active ingredient, pictorial indication of hazard classification according to GHS requires notation of health hazard in addition to an exclamation mark, and use is restricted.
Claims (3)
二液反応硬化型塗料に対する塗膜剥離性を有する剥離溶剤（Ａ）として、ｐ－メチルアセトフェノン、ジエチレングリコールモノブチルエーテルアセテートのうち、いずれか一方又は双方を含有し、
その他の剥離溶剤（Ａ）を実質的に含有しておらず、
前記剥離溶剤（Ａ）を１０～５０重量％含有する、水系塗膜剥離剤組成物。 A water-based water- based stripper composition for stripping existing coatings , comprising:
p-methylacetophenone or diethylene glycol monobutyl ether acetate as a stripping solvent (A) having coating film stripping properties for the two-component reaction curing type paint, containing either one or both of them,
It does not substantially contain other release solvents (A),
A water-based paint film remover composition containing 10 to 50% by weight of the remover solvent (A).
The water-based paint film remover composition according to claim 1 or claim 2 is applied to an existing paint film made of a two-component reaction curing type paint to swell and soften the existing paint film. A method for removing an existing paint film, comprising scraping off the existing paint film together with the paint film remover composition.
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