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JP4663835B2 - Paint remover - Google Patents

Paint remover Download PDF

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Publication number
JP4663835B2
JP4663835B2 JP26405799A JP26405799A JP4663835B2 JP 4663835 B2 JP4663835 B2 JP 4663835B2 JP 26405799 A JP26405799 A JP 26405799A JP 26405799 A JP26405799 A JP 26405799A JP 4663835 B2 JP4663835 B2 JP 4663835B2
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JP
Japan
Prior art keywords
paint
benzyl alcohol
formic acid
water
present
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP26405799A
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Japanese (ja)
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JP2001081360A (en
Inventor
博之 山下
芳次 清水
Original Assignee
株式会社シミズ
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Priority to JP26405799A priority Critical patent/JP4663835B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、塗装剥離剤に関し、特に有機塩素化合物を含まない塗装剥離剤に関する。
【0002】
【従来の技術】
従来からメチレンクロライドを主成分とする塗装剥離剤が一般に使用されている。この従来の塗装剥離剤は、引火性がなく安定しているので使用しやすく、また塗装剥離性が優れている。しかしメチレンクロライドなどの有機塩素化合物は、発ガン性があり、またその安定性ゆえに、環境中に放出された後、分解されずにいつまでも残留するという問題がある。またフロンと同様にオゾン層を破壊するという問題もある。このため現在では排水中のメチレンクロライドは0.2mg/l以下に規制されており、排水中のメチレンクロライドを0.2mg/l以下に処理することは困難である。
【0003】
【発明が解決しようとする課題】
本発明の目的は、有機塩素化合物を含まないで、従来と同じ塗装剥離性があり、かつ不揮発性で引火性のない塗装剥離剤を提供することである。
【0004】
【課題を解決するための手段】
本発明は、ぎ酸10〜40%と、ベンジルアルコール20〜40%と、トリメチルベンジルアンモニウムクロライド1〜5%と、水20%と、エチレングリコール10〜45%とから成ることを特徴とする塗装剥離剤である。
また本発明は、ぎ酸25%と、ベンジルアルコール25%と、トリメチルベンジルアンモニウムクロライド5%と、水20%と、エチレングリコール25%とから成ることを特徴とする塗装剥離剤である。
【0005】
本発明に従う塗装剥離剤は前記組成を有し、有機塩素化合物を含まない。
【0006】
ぎ酸は、塗装被膜(以下、塗膜という)の素地との密着性を低下させ、塗膜を剥離しやすくする。ぎ酸の配合割合が10%未満では剥離性が少なく、塗膜を完全に剥離しない。またぎ酸の配合割合が40%を超えると、剥離が遅くなり、剥離後の素地表面が荒れる。
【0007】
ベンジルアルコールは、塗膜に浸透し、塗膜を溶解、変質させる作用を有する。ベンジルアルコールの配合割合が20%未満では、前記作用が速やかに進まず剥離に時間がかかる。またベンジルアルコールの配合割合が40%を超えると、塗膜の一部が変質して素地に付着し剥離しない。また、ベンジルアルコールは、入手しやすくまた塗膜に浸透しやすく、揮発性も小さく塗装剥離剤として好ましい。
【0008】
トリメチルベンジルアンモニウムクロライドは、ぎ酸とベンジルアルコールとが塗膜中へ浸透するのを助け、かつ塗膜剥離後の素地荒れを防ぐ作用を有する。トリメチルベンジルアンモニウムクロライドの配合割合が1%未満では、ぎ酸とベンジルアルコールとが塗膜中へ浸透するのが遅くなり、塗膜の剥離が遅くなる。また塗膜剥離後の素地荒れを充分防ぐことができない。トリメチルベンジルアンモニウムクロライドの配合割合が5%を超えると、トリメチルベンジルアンモニウムクロライドそのものによる塗膜剥離後の素地荒れが起こる。
【0010】
水は、ベンジルアルコールと混ぜ合せることによってベンジルアルコールの引火性を抑制する作用を有する。水が20%未満では、ベンジルアルコールの引火性によって塗装剥離剤全体が引火性になる。水が60%を超えることは、ぎ酸やベンジルアルコールが希釈されることであり、塗装剥離性が低下する。
【0011】
エチレングリコールは、他の4種の成分、特に、水とベンジルアルコールとを均一に混合する作用を有する。エチレングリコールの配合割合が10%未満では、水とベンジルアルコールが充分に混ざらない。エチレングリコールの配合割合が45%を超えるとぎ酸やベンジルアルコールが希釈され塗装剥離性が低下する。また、エチレングリコールは入手しやすくまた水とベンジルアルコールの双方に溶解しやすく水と芳香族系溶解とを混ぜ合せるのに適している。
【0016】
【発明の実施の形態】
以下、実施例および比較例によって、本発明をより具体的に説明する。
【0017】
実施例1〜4
表1に示す本発明の組成範囲にあるぎ酸、芳香族系溶剤、可溶化剤、界面活性剤および水から成る塗装剥離剤の塗装剥離性などを調べた。その結果を表1に示す。
【0018】
比較例1〜4
表1に示す本発明の組成範囲外のぎ酸、芳香族系溶剤、可溶化剤、界面活性剤および水から成る塗装剥離剤の塗装剥離性などを調べた。その結果を表1に示す。
【0019】
比較例5
ジクロロメタン60%とぎ酸40%から成る従来技術の塗装剥離剤の塗装剥離性などを調べた。その結果を表1に示す。
【0020】
【表1】

Figure 0004663835
【0021】
表1の結果から、本発明の塗装剥離剤は、従来の有機塩素化合物を含む塗装剥離剤と同様の塗装剥離性を示し、かつ引火性もない。これに対し、ぎ酸を配合しないもの(比較例1)、芳香族系溶剤を配合しないもの(比較例2)は塗装剥離性が悪く、また界面活性剤を配合しないもの(比較例3)は、素地荒れが発生し、また水を配合しないもの(比較例4)は塗装剥離性は良好であるが引火性があり、いずれも塗装剥離剤として適さない。
【0022】
【発明の効果】
以上のように本発明による塗装剥離剤は、有機塩素化合物を含まず、かつ有機塩素化合物を含む従来の塗装剥離剤と同じ塗装剥離性を有し、引火性もない。これによって本発明の塗装剥離剤は特別な排水処理をしなくても、排水規制を満足し、取り扱う際に引火の心配もない。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paint release agent, and particularly to a paint release agent that does not contain an organic chlorine compound.
[0002]
[Prior art]
Conventionally, paint strippers mainly composed of methylene chloride have been used. This conventional paint stripper is easy to use because it is stable without flammability, and is excellent in paint peelability. However, organochlorine compounds such as methylene chloride have a carcinogenic property, and due to their stability, there is a problem that they remain indefinitely after being released into the environment without being decomposed. There is also the problem of destroying the ozone layer, similar to Freon. Therefore, at present, methylene chloride in waste water is regulated to 0.2 mg / l or less, and it is difficult to treat methylene chloride in waste water to 0.2 mg / l or less.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide a paint remover which does not contain an organic chlorine compound, has the same paint peelability as that of the conventional art, and is non-volatile and nonflammable.
[0004]
[Means for Solving the Problems]
The present invention is a coating comprising 10 to 40% formic acid , 20 to 40% benzyl alcohol, 1 to 5% trimethylbenzylammonium chloride, 20% water, and 10 to 45% ethylene glycol. It is a release agent.
The present invention also provides a paint remover comprising 25% formic acid, 25% benzyl alcohol, 5% trimethylbenzylammonium chloride, 20% water, and 25% ethylene glycol.
[0005]
The paint stripper according to the present invention has the above composition and does not contain an organic chlorine compound.
[0006]
Formic acid reduces the adhesion of the paint film (hereinafter referred to as the paint film) to the substrate and makes it easy to peel the paint film. When the blending ratio of formic acid is less than 10%, the peelability is low and the coating film is not completely peeled off. Moreover, when the mixture ratio of formic acid exceeds 40%, peeling becomes slow, and the substrate surface after peeling becomes rough.
[0007]
Benzyl alcohol has the action of penetrating into the coating film and dissolving and modifying the coating film. When the blending ratio of benzyl alcohol is less than 20%, the above action does not proceed rapidly and it takes time for peeling. On the other hand, if the blending ratio of benzyl alcohol exceeds 40%, a part of the coating film is altered and adheres to the substrate and does not peel off. Also, benzyl alcohol is easy to obtain, easily penetrates into the coating film, has low volatility, and is preferable as a coating release agent.
[0008]
Trimethylbenzylammonium chloride has an action of helping formic acid and benzyl alcohol to penetrate into the coating film and preventing roughening of the substrate after peeling of the coating film. When the blending ratio of trimethylbenzylammonium chloride is less than 1%, the penetration of formic acid and benzyl alcohol into the coating film is delayed, and the peeling of the coating film is delayed. Moreover, the rough surface of the substrate after peeling off the coating cannot be sufficiently prevented. When the blending ratio of trimethylbenzylammonium chloride exceeds 5%, roughening of the substrate after peeling of the coating film due to trimethylbenzylammonium chloride itself occurs.
[0010]
Water has the action of suppressing the flammability of benzyl alcohol when mixed with benzyl alcohol . If the water is less than 20%, the entire paint stripper becomes flammable due to the flammability of benzyl alcohol . When water exceeds 60%, formic acid and benzyl alcohol are diluted, and the paint peelability is lowered.
[0011]
Ethylene glycol has the effect of uniformly mixing the other four components, particularly water and benzyl alcohol . When the blending ratio of ethylene glycol is less than 10%, water and benzyl alcohol are not sufficiently mixed. When the blending ratio of ethylene glycol exceeds 45%, formic acid and benzyl alcohol are diluted and the paint peelability is lowered. In addition, ethylene glycol is easily available and easily dissolved in both water and benzyl alcohol, and is suitable for mixing water and aromatic solvents.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
[0017]
Examples 1-4
The paint release properties of the paint release agent comprising formic acid, aromatic solvent, solubilizer, surfactant and water within the composition range of the present invention shown in Table 1 were examined. The results are shown in Table 1.
[0018]
Comparative Examples 1-4
The paint release properties of a paint release agent comprising formic acid, aromatic solvent, solubilizer, surfactant and water outside the composition range of the present invention shown in Table 1 were examined. The results are shown in Table 1.
[0019]
Comparative Example 5
The paint peelability of a prior art paint remover comprising 60% dichloromethane and 40% formic acid was examined. The results are shown in Table 1.
[0020]
[Table 1]
Figure 0004663835
[0021]
From the results in Table 1, the paint release agent of the present invention exhibits the same paint release property as that of a conventional paint release agent containing an organic chlorine compound, and has no flammability. On the other hand, those that do not contain formic acid (Comparative Example 1) and those that do not contain an aromatic solvent (Comparative Example 2) have poor paint peelability and those that do not contain a surfactant (Comparative Example 3). In addition, the surface roughening occurs, and water-free compounding (Comparative Example 4) has good paint peelability but flammability, and none of them is suitable as a paint stripper.
[0022]
【The invention's effect】
As described above, the paint remover according to the present invention does not contain an organic chlorine compound, has the same paint peelability as that of a conventional paint remover containing an organic chlorine compound, and has no flammability. As a result, the paint stripper of the present invention satisfies drainage regulations without any special wastewater treatment, and there is no fear of ignition when handled.

Claims (2)

ぎ酸10〜40%と、ベンジルアルコール20〜40%と、トリメチルベンジルアンモニウムクロライド1〜5%と、水20%と、エチレングリコール10〜45%とから成ることを特徴とする塗装剥離剤。A paint remover comprising 10-40% formic acid , 20-40% benzyl alcohol, 1-5% trimethylbenzylammonium chloride, 20% water, and 10-45% ethylene glycol . ぎ酸25%と、ベンジルアルコール25%と、トリメチルベンジルアンモニウムクロライド5%と、水20%と、エチレングリコール25%とから成ることを特徴とする塗装剥離剤。A paint remover comprising 25% formic acid, 25% benzyl alcohol, 5% trimethylbenzylammonium chloride, 20% water, and 25% ethylene glycol.
JP26405799A 1999-09-17 1999-09-17 Paint remover Expired - Fee Related JP4663835B2 (en)

Priority Applications (1)

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JP26405799A JP4663835B2 (en) 1999-09-17 1999-09-17 Paint remover

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JP4663835B2 true JP4663835B2 (en) 2011-04-06

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4983212B2 (en) * 2006-11-13 2012-07-25 株式会社スリーボンド Cleaning composition
JP4755659B2 (en) * 2008-01-31 2011-08-24 磯部塗装株式会社 Substrate adjustment method
EP2630206A1 (en) * 2010-12-17 2013-08-28 Dow Global Technologies LLC Acidic microemulsion stripping formulations
JP2013035205A (en) * 2011-08-08 2013-02-21 Nicca Chemical Co Ltd Method for manufacturing recycled polypropylene resin formed body

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6157665A (en) * 1984-07-24 1986-03-24 Chuo Kagaku Kk Paint peeling agent
JPH10168363A (en) * 1996-12-06 1998-06-23 Elf Atochem Sa Aqueous composition for peeling paint and primer having high cross-linking degree
JPH10168364A (en) * 1996-12-06 1998-06-23 Elf Atochem Sa Peeling composition for paint, varnish or lacquer
JPH1121482A (en) * 1997-06-30 1999-01-26 Izumiya Yakuhin Kk Coating film releasing agent composition
JPH11209665A (en) * 1998-01-30 1999-08-03 Nippon Cb Chemical Kk Coating film release agent

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6157665A (en) * 1984-07-24 1986-03-24 Chuo Kagaku Kk Paint peeling agent
JPH10168363A (en) * 1996-12-06 1998-06-23 Elf Atochem Sa Aqueous composition for peeling paint and primer having high cross-linking degree
JPH10168364A (en) * 1996-12-06 1998-06-23 Elf Atochem Sa Peeling composition for paint, varnish or lacquer
JPH1121482A (en) * 1997-06-30 1999-01-26 Izumiya Yakuhin Kk Coating film releasing agent composition
JPH11209665A (en) * 1998-01-30 1999-08-03 Nippon Cb Chemical Kk Coating film release agent

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