JPH03290475A - Treating liquid for removing coating of aluminum alloy can - Google Patents
Treating liquid for removing coating of aluminum alloy canInfo
- Publication number
- JPH03290475A JPH03290475A JP9332290A JP9332290A JPH03290475A JP H03290475 A JPH03290475 A JP H03290475A JP 9332290 A JP9332290 A JP 9332290A JP 9332290 A JP9332290 A JP 9332290A JP H03290475 A JPH03290475 A JP H03290475A
- Authority
- JP
- Japan
- Prior art keywords
- vol
- aluminum alloy
- methylene chloride
- formic acid
- methanol
- 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.)
- Pending
Links
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 54
- 239000007788 liquid Substances 0.000 title claims abstract description 18
- 238000000576 coating method Methods 0.000 title abstract description 16
- 239000011248 coating agent Substances 0.000 title description 10
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims abstract description 60
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 48
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims abstract description 40
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims abstract description 20
- 235000019253 formic acid Nutrition 0.000 claims abstract description 20
- 229910017464 nitrogen compound Inorganic materials 0.000 claims abstract description 12
- 150000002830 nitrogen compounds Chemical class 0.000 claims abstract description 12
- 239000003973 paint Substances 0.000 claims description 36
- 230000008020 evaporation Effects 0.000 claims description 7
- 238000001704 evaporation Methods 0.000 claims description 7
- 239000004094 surface-active agent Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000003112 inhibitor Substances 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 239000003960 organic solvent Substances 0.000 claims description 2
- 125000000218 acetic acid group Chemical class C(C)(=O)* 0.000 claims 4
- 238000007865 diluting Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 4
- 239000002253 acid Substances 0.000 abstract description 3
- 239000006223 plastic coating Substances 0.000 abstract description 3
- 150000007513 acids Chemical class 0.000 abstract 1
- -1 etc. Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 19
- 239000002904 solvent Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 15
- 150000001243 acetic acids Chemical class 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000002699 waste material Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000976 ink Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 238000003892 spreading Methods 0.000 description 3
- 230000008961 swelling Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000012190 activator Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000010297 mechanical methods and process Methods 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000002522 swelling effect Effects 0.000 description 2
- 229920001817 Agar Polymers 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000008272 agar Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- WBJINCZRORDGAQ-UHFFFAOYSA-N ethyl formate Chemical compound CCOC=O WBJINCZRORDGAQ-UHFFFAOYSA-N 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- YNJBWRMUSHSURL-UHFFFAOYSA-N trichloroacetic acid Chemical compound OC(=O)C(Cl)(Cl)Cl YNJBWRMUSHSURL-UHFFFAOYSA-N 0.000 description 1
- 229960004319 trichloroacetic acid Drugs 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明はアルミニウム合金缶の塗料除去処理液に関し、
さらに詳しくは、アルミニウム合金缶の表面および内面
に塗布されている塗料を除去することができるアルミニ
ウム合金缶の塗料除去処理液に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paint removal treatment liquid for aluminum alloy cans;
More specifically, the present invention relates to a paint removal treatment liquid for aluminum alloy cans that can remove paint applied to the surfaces and inner surfaces of aluminum alloy cans.
［従来技術］
一般に、アルミニウム合金製品は原料−溶解一鋳造一塑
性加工−表面処理一検査の各工程を経て製造されている
。[Prior Art] Generally, aluminum alloy products are manufactured through the following steps: raw material, melting, casting, plastic working, surface treatment, and inspection.
この場合、原料について考えるとアルミニウム地金は全
部輸入に依存しており、安定に供給されることが重要な
ことであり、その一部としてアルミニウム合金屑のスク
ラップを利用することが要望されている。In this case, considering the raw materials, all aluminum ingots are imported, and it is important to have a stable supply, and it is requested that aluminum alloy scrap be used as part of this. .
このアルミニウム合金屑をスクラップとして回収する際
の、アルミニウム合金製品の生産量とスクラップ回収率
を比較した場合、生産量の多い運輸、建築関係が回収率
が高く、有効に利用されている。When collecting this aluminum alloy waste as scrap, when comparing the production volume of aluminum alloy products and the scrap recovery rate, it is found that products related to transportation and construction, which have a large production volume, have a high recovery rate and are effectively used.
しかし、最近になって、その生産量が急激に増大してき
ている、アルミニウム合金板生産量の約２０％を占める
キャン材、即ち、アルミニウム合金缶の屑は、その回収
率は５０％以下と極めて低く、かつ、用途も限定されて
いる。このようなことから、アルミニウム合金の回収、
再利用技術の確立が要望されている。However, recently, the production of aluminum alloy can scraps, which account for about 20% of the aluminum alloy plate production, has been increasing rapidly, and the recovery rate is extremely low at less than 50%. It is low and its uses are limited. For this reason, recovery of aluminum alloy,
Establishment of reuse technology is desired.
そして、アルミニウム合金缶屑は元のアルミニウム合金
缶の原料として、元に戻して再利用することか有効であ
り、（１）一定の品質、（２）！の安定性、（３）回転
サイクルの速さ等に効果が認められるが、（１）溶解歩
留りが悪い、（２）溶湯成分不良か生じ易い、（３）溶
解による排ガスが発生する等の問題がある。It is also effective to return and reuse aluminum alloy can waste as raw material for the original aluminum alloy cans; (1) constant quality; (2)! The effect is seen on the stability of the molten metal, (3) speed of rotation cycle, etc., but there are problems such as (1) poor melting yield, (2) easy occurrence of poor molten metal composition, and (3) generation of exhaust gas due to melting. There is.
さらに、上記に説明したアルミニウム合金缶屑を原料と
して再利用する際の問題の他に、アルミニウム合金缶腑
の表面および内面には、防蝕、防錆、耐薬品、耐油等ア
ルミニウム合金の保護のため、および、光沢、色彩、標
識等の美化のための印刷やプラスチックコーティング等
の塗料やインク等の有機被覆物が施されており、この有
機被覆物を除去しなければ良好なアルミニウム合金缶腑
を再利用することができないという問題がある。Furthermore, in addition to the problems described above when reusing aluminum alloy can scraps as raw materials, the surface and inner surface of aluminum alloy cans are protected against corrosion, rust, chemicals, oil, etc. to protect the aluminum alloy. , and organic coatings such as paints and inks such as printing and plastic coatings for beautification such as gloss, color, and signs, and if these organic coatings are not removed, the aluminum alloy can will not be in good condition. The problem is that it cannot be reused.
このような問題を解決するため、従来は上記塗料やイン
ク等を除去する手段として、熱的方法、機械的方法およ
びこれらの組合せ方法として、次の方法がある。To solve this problem, the following methods have conventionally been used to remove the paint, ink, etc., including thermal methods, mechanical methods, and combinations thereof.
（１）熱的方法（特公昭５９−０３７３３７号公報）塗
料の主成分は高分子系であるため、加熱処理により燃焼
、除去する方法であるが、この方法は塗料除去率および
燃焼排ガスによる公害等の問題がある。しかし、アメリ
カでは多用されている。(1) Thermal method (Japanese Patent Publication No. 59-037337) Since the main component of paint is polymeric, it is burned and removed by heat treatment, but this method reduces the paint removal rate and reduces the pollution caused by combustion exhaust gas. There are other problems. However, it is widely used in America.
（２）機械的方法
鉄ボールをアルミニウム合金缶屑表面に衝突させて、塗
料層を破壊して除去する方法であるか、この方法におい
ては使用したンヲット用ボールの摩耗粉が混入して、鉄
成分不良となる。(2) Mechanical method Either the iron ball is collided with the surface of the aluminum alloy can scrap to destroy and remove the paint layer. Ingredients become defective.
（３Ｘｌ）および（２）能力組合せ方法（実開昭６１１
４７２５７号公報）
熱的に分解させると共に、ロータリーキルン方式等によ
る燃焼して塗料を除去する設備であるが、工程が複雑化
するという問題がある。(3Xl) and (2) ability combination method
No. 47257) This equipment removes paint by thermally decomposing it and burning it using a rotary kiln method, etc., but there is a problem in that the process becomes complicated.
このような有機被覆物を除去する方法としては、１）高
温において燃焼除去する方法。Methods for removing such organic coatings include 1) a method of removing them by burning at a high temperature;
２）サンドブラスト、タンブラ−等による機械的剥離方
法。2) Mechanical peeling method using sandblasting, tumbler, etc.
３）電解液中において電気分解による電解剥離方法。3) Electrolytic stripping method using electrolysis in an electrolytic solution.
とうが挙げられているが、これら何れの方法も−長−短
があり、効率良く、かつ、高精度に除去することは困難
である。However, each of these methods has advantages and disadvantages, and it is difficult to remove them efficiently and with high precision.
そのため、アルミニウム合金缶肩表面および内面の有機
被覆物を、大量に、かつ、効率良く除去する方法として
、薬品または剥離性による化学的剥離法が挙げられる。Therefore, as a method for efficiently removing a large amount of the organic coating on the shoulder surface and inner surface of an aluminum alloy can, there is a chemical peeling method using chemicals or peeling properties.
また、アルミニウム合金缶屑表面および内面の有機被覆
物は、耐薬品性、密着性に優れた皮膜として施されてお
り、この有機被覆物をアルミニウム合金缶屑から除去す
るためには、溶解除去するか、潤滑剥離（皮膜剥離）が
あり、
■皮膜を劣化、変質させ素材との密着性を低下させる。In addition, the organic coating on the surface and inner surface of aluminum alloy can scraps is applied as a film with excellent chemical resistance and adhesion, and in order to remove this organic coating from aluminum alloy can scraps, it must be dissolved and removed. Or, there is lubrication peeling (film peeling), which deteriorates and alters the film and reduces its adhesion to the material.
■溶剤が皮膜を溶解または膨潤させる能力がある。■The solvent has the ability to dissolve or swell the film.
■溶剤により膨潤した樹脂皮膜の膨張力、展張力がその
皮膜自体が持つ素材への密着力および素材の化学的、物
理的処理による密着保護力を上回らなければならない。■The expansion force and spreading tension of the resin film swollen by the solvent must exceed the adhesion power of the film itself to the material and the adhesion protection power due to chemical and physical processing of the material.
という条件が必要となってくる。This condition becomes necessary.
しかしながら、このような条件を満足するようなアルミ
ニウム合金缶腑表面および内面の有機被覆物を効率良く
除去できる処理液は存在していないのが現状である。However, at present, there is no treatment liquid that can efficiently remove organic coatings on the surface and inner surface of an aluminum alloy can that satisfies these conditions.
［発明が解決しようとする課題］
本発明は上記に説明した従来におけるアルミニウム合金
製品のスクラップおよびアルミニウム合金缶屑の再利用
の種々の問題点に鑑み、本発明者が鋭意研究を行い、検
討を重ねた結果、特に、アルミニウム合金缶屑表面およ
び内面に塗布されている塗料を化学的に吹化、膨潤させ
ることにより剥離させるアルミニウム合金缶の塗料除去
処理液を開発したのである。[Problems to be Solved by the Invention] In view of the various problems in the conventional recycling of aluminum alloy product scraps and aluminum alloy can scraps explained above, the present inventor has conducted extensive research and studies. As a result of repeated efforts, we developed a paint removal treatment solution for aluminum alloy cans that chemically blows and swells the paint applied to the surface and inner surface of aluminum alloy can scraps to remove it.
［問題点を解決するための手段］
本発明に係るアルミニウム合金缶の塗料除去処理液は、
（１）メタノール１０〜２０ｖｏｌ％、蟻酸３〜１５ｖ
ｏｌ％
を含有し、また、
ハロゲン化酢酸、ハロゲン化窒素化合物の内から選んだ
１種または２種
を０１〜５ｖｏｌ％
を含有し、残部は塩化メチレン７０〜８５ｖｏｌ％から
なることを特徴とするアルミニウム合金缶の塗料除去処
理液を第１の発明とし、
（２）メタノール！０〜２０ＶＯ１％、蟻酸３〜１５ｖ
ｏｌ％
を含有し、また、
ハロゲン化酢酸、ハロゲン化窒素化合物の内から選んだ
１種または２種
を０．１〜６ｖｏｌ％
を含有し、さらに、
界面活性剤０．１〜５ｖｏｌ％、
蒸発防止剤０．１〜２ｖｏｌ％
の内から選んだｌＮまたは２種
を含有し、残部は塩化メチレン７０〜８５ｖｏｌ％から
なることを特徴とするアルミニウム合金缶の塗料除去処
理液を第２の発明とし、
（３）メタノール１０〜２０ｖｏｌ％、蟻酸３〜１５ｖ
ｏｌ％
を含有し、また、
ハロゲン化酢酸、ハロゲン化窒素化合物の内から選んだ
１種または２種
を０」〜５ｖｏｌ％
を含有し、残部は塩化メチレン７０〜８５ｖｏｌ％から
なる処理液を有機溶剤または水により希釈したことを特
徴とするアルミニウム合金缶の塗料除去処理液を第３の
発明とし、
（４）メタノール１０〜２０ｖｏｌ％、蟻酸３〜１５ｖ
ｏｌ％
を含有し、また、
ハロゲン化酢酸、ハロゲン化窒素化合物の内から選んだ
１種または２種
を０．１〜５ｖｏｌ％
を含有し、さらに、
界面活性剤０．１〜５ｖｏｌ％、
蒸発防止剤０．１〜２ｖｏｌ％
の内から選んだ１種または２種
を含有し、残部は塩化メチレン７０〜８５ｖｏｌ％から
なる処理液を有機溶剤または水により希釈することを特
徴とするアルミニウム合金缶の塗料除表処理液を第４の
発明とする４つの発明よりなるものである。[Means for Solving the Problems] The paint removal treatment liquid for aluminum alloy cans according to the present invention includes: (1) 10 to 20 vol% methanol, 3 to 15 vol% formic acid;
It also contains 01-5 vol% of one or two selected from halogenated acetic acid and halogenated nitrogen compounds, and the remainder consists of 70-85 vol% methylene chloride. The first invention is a paint removal treatment liquid for aluminum alloy cans, (2) Methanol! 0~20VO1%, formic acid 3~15v
It also contains 0.1 to 6 vol% of one or two selected from halogenated acetic acid and halogenated nitrogen compounds, and further contains 0.1 to 5 vol% of a surfactant, and evaporation. A second invention provides a paint removal treatment liquid for aluminum alloy cans, which contains lN or two selected from 0.1 to 2 vol% of inhibitors, and the remainder consists of 70 to 85 vol% of methylene chloride. , (3) Methanol 10-20vol%, formic acid 3-15v
In addition, a treatment solution containing 0 to 5 vol% of one or two selected from halogenated acetic acid and halogenated nitrogen compounds, and the remainder consisting of 70 to 85 vol% of methylene chloride, is treated with an organic A third invention is a paint removal treatment solution for aluminum alloy cans, which is characterized by being diluted with a solvent or water, (4) methanol 10-20 vol%, formic acid 3-15 vol%
It also contains 0.1 to 5 vol% of one or two selected from halogenated acetic acid and halogenated nitrogen compounds, and further contains 0.1 to 5 vol% of a surfactant, and evaporation. An aluminum alloy can containing one or two selected from 0.1 to 2 vol% of inhibitors, with the remainder being 70 to 85 vol% of methylene chloride, which is diluted with an organic solvent or water. This invention consists of four inventions, with the fourth invention being a paint surface removal treatment liquid.
本発明に係るアルミニウム合金缶の塗料除去処理液につ
いて、以下詳細に説明する。The paint removal treatment liquid for aluminum alloy cans according to the present invention will be described in detail below.
メタノールは軟化、膨潤作用には直接影響を与えるもの
ではなく、むしろ能力の低下を招来するが、塩化メチレ
ンの主溶剤に促進剤を溶解させるための溶解度の増大作
用が大きいものであるとの知見を得、総合的に軟化、膨
潤作用を促進させるという効果を有しており、含有量が
ｌｏｖｏｌ％未満ではこのような効果は期待することが
できず、また、２０ｖｏｌ％を越えて含有されるとこの
ような効果は飽和してしまう。よって、メタノール含有
量はｌＯ〜２０ｖｏｌ％とする。It was found that methanol does not directly affect the softening and swelling effects, rather it causes a decrease in the ability, but it has a large effect of increasing the solubility of the accelerator in the main solvent of methylene chloride. It has the effect of promoting softening and swelling effects in a comprehensive manner, and such effects cannot be expected if the content is less than lovol%, and if it is contained in excess of 20vol%. This effect becomes saturated. Therefore, the methanol content is set to 10 to 20 vol%.
蟻酸は主溶剤の塩化メチレンの作用を促進する効果を有
するものであり、分子量の面から主溶剤の塩化メチレン
と同様に分子量の小さい酸として蟻酸を選定し、含有量
が３ｖｏｌ％未満では主溶剤の作用を促進する効果は少
なく、また、１５ｖｏｌ％を越えて含有させると、効果
は含有量の増加する割には増大することはない。よって
、蟻酸含有量は３〜１５ｖｏｌ％とする。Formic acid has the effect of accelerating the action of methylene chloride, the main solvent, and from the viewpoint of molecular weight, formic acid is selected as an acid with a small molecular weight, similar to methylene chloride, the main solvent, and if the content is less than 3 vol%, it is used as the main solvent. The effect of promoting the action of is small, and when the content exceeds 15 vol%, the effect does not increase as the content increases. Therefore, the formic acid content is set to 3 to 15 vol%.
塩化メチレンは主溶剤であり、アルミニウム合金缶屑の
表面または内面の塗料層に侵入して、軟化、膨潤させて
剥離する効果を有するものであり、そして、主溶剤とし
ては分子量の小さい溶剤の方が効果が大きく、含有量が
７０ｖｏｌ％未満ではこのような効果は期待できず、ま
た、８５ｖｏｌ％を越えて含有させると他の含有成分の
効果を損なうようになる。よって、塩化メチレン含有量
は７０〜８５ｖｏｌ％とする。Methylene chloride is the main solvent, and has the effect of penetrating the paint layer on the surface or inner surface of aluminum alloy can scraps, softening and swelling them, and peeling them off. has a large effect, and if the content is less than 70 vol%, such an effect cannot be expected, and if the content exceeds 85 vol%, the effects of other components will be impaired. Therefore, the methylene chloride content is set to 70 to 85 vol%.
また、ハロゲン化酢酸（モノ、ジ、トリ等のクロル酢酸
、または、ブロム酢酸等）およびハロゲン化窒素化合物
の内から選んだ１種または２種の促進剤を含有させるの
は、これら促進剤は蟻酸と同様に主溶剤の作用を促進さ
せるものであり、溶剤の溶解能を低下させ、有機被覆物
の膨潤剥離を促進させるものである。Furthermore, the reason why one or two types of accelerators selected from halogenated acetic acids (mono-, di-, tri-chloroacetic acid, bromoacetic acid, etc.) and halogenated nitrogen compounds is contained is because these accelerators are Like formic acid, it accelerates the action of the main solvent, reduces the dissolving ability of the solvent, and promotes swelling and peeling of the organic coating.
そして、後記する実施例に説明する通り、促進剤を含有
しない場合には、アルミニウム合金缶の表裏両面共に、
かつ、特に、塗料の除去が困難であるＴｉ酸化物等の白
色系塗料（インクを含む。）の除去は極めて困難である
。As explained in the examples below, when no accelerator is contained, both the front and back surfaces of the aluminum alloy can,
In addition, it is particularly difficult to remove white paint (including ink) such as Ti oxide, which is difficult to remove.
従って、これらの促進剤は効果を発現させるため、また
、効果が飽和し、かつ、液の安定性の点から、これら促
進剤の１種または２種の含有量は０．１〜５ｖ０１％と
する。Therefore, in order to express the effect of these accelerators, to saturate the effect, and to ensure stability of the liquid, the content of one or two of these accelerators should be 0.1 to 5v01%. do.
また、上記に説明したメタノール、蟻酸および塩化メチ
レンと促進剤以外に、界面活性剤および蒸発防止剤を含
有させることができる。Furthermore, in addition to methanol, formic acid, methylene chloride, and the accelerator described above, a surfactant and an evaporation inhibitor may be contained.
界面活性剤としては非イオン界面活性剤およびフッソ系
界面活性剤の組み合わせが好ましく、主溶剤および促進
剤等の表面張力を低下させ、それらがアルミニウム合金
缶屑の表面または内面の塗料層に侵入し易くして、該塗
料層の界面張力を低下させる作用および膨潤除去された
塗料層をアルミニウム合金缶屑の面から分離除去する作
用を有するものであり、含有量が０．１ｖｏｌ％未満で
はこのような効果は少なく、また、５ｖｏｌ％を越えて
含有させると効果は飽和してしまう。、よって、活性剤
の含有量は０．ｌ−５ｖｏｌ％とする。As the surfactant, a combination of a nonionic surfactant and a fluorosurfactant is preferable, and it lowers the surface tension of the main solvent and accelerator, and prevents them from penetrating into the paint layer on the surface or inner surface of aluminum alloy can scraps. It has the effect of reducing the interfacial tension of the paint layer and separating and removing the swollen and removed paint layer from the surface of the aluminum alloy can waste. The effect is small, and if the content exceeds 5 vol%, the effect will be saturated. , Therefore, the content of activator is 0. 1-5 vol%.
蒸発防止剤は主溶剤の塩化メチレン、メタノールおよび
蟻酸等の蒸発を防止するために、実際に処理を行なう場
合に、溶液表面を被覆する必要があり、そのため比重差
があり、かつ、安定な物質として水またはパラフィン、
脂肪酸等炭化水素化合物を使用するのがよい。 第１図
に主溶剤の塩化メチレン、促進剤の蟻酸およびメタノー
ルの含有範囲を斜線で示しである。［実 施 例］本発
明に係るアルミニウム合金缶屑の塗料除去用処理液およ
び処理方法の実施例を比較例と共に説明する。In order to prevent the evaporation of the main solvents methylene chloride, methanol, and formic acid, evaporation inhibitors must be coated on the surface of the solution during actual treatment, and therefore are stable substances with different specific gravity. as water or paraffin,
Hydrocarbon compounds such as fatty acids are preferably used. In FIG. 1, the content ranges of methylene chloride as a main solvent, formic acid as an accelerator, and methanol are indicated by diagonal lines. [Example] Examples of the treatment solution and treatment method for removing paint from aluminum alloy can scraps according to the present invention will be described together with comparative examples.
実施例１
第１表に示す各種の塗料除去用処理液を使用して処理を
行ない、アルミニウム合金缶屑の塗料の剥離試験を行な
った。Example 1 A paint peeling test was conducted on aluminum alloy can scraps using various paint removal treatment solutions shown in Table 1.
第２表に剥離試験結果を示す。Table 2 shows the peel test results.
なお、使用したスクラップはＴｉ酸化物を含む白色系塗
料が施されたビール缶である。The scrap used was a beer can coated with a white paint containing Ti oxide.
第
１
表
αＸ＝ハロゲン化酢酸、α２＝ハロゲン化窒素化合物活
性剤−非イオン系界面活性剤（ＨＬ Ｂ １３〜１５）
フッソ系界面活性剤（フロロカーボン系）硝酸以外は総
てｖｏｌ％である。Table 1 αX = halogenated acetic acid, α2 = halogenated nitrogen compound activator - nonionic surfactant (HL B 13-15)
All except for the fluorocarbon surfactant (fluorocarbon type) and nitric acid are vol%.
第２表
○＝剥離、△−圧力水洗剥離、×＝剥離せず皮膜＝固体
状態、ゲル＝寒天状
この第２表から次のことがわかる。Table 2 ○=Peeling, Δ-Peeling with pressure water, ×=No peeling, Film=Solid state, Gel=Agar state From this Table 2, the following can be seen.
この試験結果からアルミニウム合金缶屑の表面および内
面（裏）に施されている有機被覆物の種類の異なってい
ることがわかる。The test results show that the types of organic coatings applied to the surface and inner surface (back) of aluminum alloy can scraps are different.
比較例１は無機酸のみであり、これでもアルミニウム合
金缶屑表面の有機被覆物の剥離は可能であるが、内面（
裏）は同じ時間で剥離はしない。しかし、さらに長時間
の浸漬では剥離は可能であった。Comparative Example 1 uses only inorganic acid, and although it is possible to remove the organic coating on the surface of the aluminum alloy can scrap, the inner surface (
The back) will not peel off at the same time. However, peeling was possible with longer immersion.
比較例２は有機被覆物が主溶剤である塩化メチレンと促
進剤の蟻酸により膨潤軟化して、皮膜としての展張力が
弱くなり、自然剥離はしない。In Comparative Example 2, the organic coating was swollen and softened by methylene chloride as the main solvent and formic acid as an accelerator, and the spreading tension as a film was weakened, so that it did not peel off naturally.
比較例３は蟻酸の代わりに燐酸を使用しているので、ア
ルミニウム合金缶屑の表裏共に有機被覆物は剥離しない
ものである。Since Comparative Example 3 uses phosphoric acid instead of formic acid, the organic coating does not peel off from both the front and back sides of the aluminum alloy can waste.
比較例４は有機被覆物が主溶剤である塩化メチレンと蟻
酸はおよびフェリールにより膨潤軟化してゲル化して、
アルミニウム合金缶屑表面は剥離したが、内面（裏）は
膨潤ゲル化しているが皮膜としての展張力が弱くなり、
自然剥離はせず、圧力）水により洗い落とさなければな
らない。In Comparative Example 4, the organic coating was swollen and softened by the main solvents, methylene chloride and formic acid, and feryl, and gelled.
The surface of the aluminum alloy can scrap has peeled off, but the inner surface (back side) has swollen and gelled, but the tension as a film has weakened.
It does not peel off naturally, but must be washed off with water (pressure).
比較例５は苛性ソーダを使用することにより、アルミニ
ウム合金缶屑表裏共に剥離はしない。In Comparative Example 5, by using caustic soda, neither the front nor the back of the aluminum alloy can scraps were peeled off.
実施例６および７は本発明に係るアルミニウム合金缶屑
の塗料除去処理液を使用した場合であり、α（ハロゲン
化酢酸およびハロゲン化窒素化合物）の添加により、ま
た、その溶解に使用したメタノール等の作用によって溶
剤の溶解能を低下させ、有機被覆物の膨潤剥離を促進し
、展張力（皮膜が膨張する時の横向きに作用する力）を
充分に生かすことにより、短時間で自然剥離が行なわれ
た。Examples 6 and 7 are cases where the paint removal treatment liquid for aluminum alloy can scraps according to the present invention was used, and by adding α (halogenated acetic acid and halogenated nitrogen compound), methanol etc. used for dissolving it By reducing the dissolving ability of the solvent and promoting the swelling and peeling of the organic coating, and by making full use of the spreading tension (the force that acts sideways when the film expands), natural peeling occurs in a short time. It was.
実施例２
実施例１におけるＮｏ、６実施例の塗料除去処理液を使
用して、アルミニウム合金缶屑の塗料を除去してから溶
解を行なった。Example 2 Using the paint removal treatment liquid of Example 6 and No. 1 in Example 1, paint was removed from aluminum alloy can scraps and then dissolved.
アルミニウム合金缶屑 １００％
溶解条件
溶解重量 １屯
溶解炉 坩堝式誘導炉
溶湯温度 ７１０℃±１０℃
昇温速度
精錬
３００℃／時
なし
［発明の効果］
以上説明したように、本発明に係るアルミニウム合金缶
の塗料除去用処理液は上記の構成を有しているものであ
るから、アルミニウム合金缶肩の表面に防蝕、防錆、耐
薬品、耐油のアルミニウム合金缶の保護ため、また、光
沢、色彩、標識の美化のために施されている印刷、およ
びプラスチックコーティング、さらに、アルミニウム合
金缶屑の内面に塗布されている塗料を短時間、かつ、確
実に除去するこができるという優れた効果を有している
。Aluminum alloy can scraps 100% Melting conditions Melting weight 1 ton Melting furnace Crucible induction furnace Molten metal temperature 710°C ± 10°C Heating rate Refining 300°C/hour No [Effects of the invention] As explained above, the aluminum according to the present invention Since the treatment liquid for removing paint from alloy cans has the above-mentioned composition, it can be applied to the surface of the aluminum alloy can shoulder to protect the aluminum alloy can from corrosion, rust, chemicals, and oil. It has the excellent effect of being able to quickly and reliably remove colors, printing applied to beautify signs, plastic coatings, and paint applied to the inner surface of aluminum alloy can waste. have.
第１図は本発明に係るアルミニウム合金缶の塗料除去処
理液の組成を示す図である。FIG. 1 is a diagram showing the composition of the paint removal treatment liquid for aluminum alloy cans according to the present invention.
Claims (4)
なることを特徴とするアルミニウム合金缶の塗料除去処
理液。(1) Contains 10 to 20 vol% methanol, 3 to 15 vol% formic acid, and 0.1 to 5 vol% of one or two selected from halogenated acetic acid and halogenated nitrogen compounds, with the remainder is a paint removal treatment liquid for aluminum alloy cans, characterized by comprising 70 to 85 vol% of methylene chloride.
なることを特徴とするアルミニウム合金缶の塗料除去処
理液。(2) Contains 10 to 20 vol% methanol, 3 to 15 vol% formic acid, and 0.1 to 5 vol% of one or two selected from halogenated acetic acid and halogenated nitrogen compounds; , 0.1 to 5 vol% of a surfactant, and 0.1 to 2 vol% of an evaporation inhibitor, with the remainder being 70 to 85 vol% of methylene chloride. Paint removal treatment liquid for alloy cans.
なる処理液を有機溶剤または水により希釈したことを特
徴とするアルミニウム合金缶の塗料除去処理液。(3) Contains 10 to 20 vol% methanol, 3 to 15 vol% formic acid, and 0.1 to 5 vol% of one or two selected from halogenated acetic acid and halogenated nitrogen compounds, with the remainder 1 is a paint removal treatment solution for aluminum alloy cans, which is obtained by diluting a treatment solution containing 70 to 85 vol% methylene chloride with an organic solvent or water.
なる処理液を有機溶剤または水により希釈することを特
徴とするアルミニウム合金缶の塗料除去処理液。(4) Contains 10 to 20 vol% methanol, 3 to 15 vol% formic acid, and 0.1 to 5 vol% of one or two selected from halogenated acetic acid and halogenated nitrogen compounds; , 0.1 to 5 vol% of a surfactant, and 0.1 to 2 vol% of an evaporation inhibitor, with the remainder being 70 to 85 vol% of methylene chloride. A paint removal treatment solution for aluminum alloy cans that is diluted with water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9332290A JPH03290475A (en) | 1990-04-09 | 1990-04-09 | Treating liquid for removing coating of aluminum alloy can |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9332290A JPH03290475A (en) | 1990-04-09 | 1990-04-09 | Treating liquid for removing coating of aluminum alloy can |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03290475A true JPH03290475A (en) | 1991-12-20 |
Family
ID=14079054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9332290A Pending JPH03290475A (en) | 1990-04-09 | 1990-04-09 | Treating liquid for removing coating of aluminum alloy can |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03290475A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995019454A1 (en) * | 1994-01-17 | 1995-07-20 | Honda Giken Kogyo Kabushiki Kaisha | Method for recycling aluminum alloy product scraps for automobile |
-
1990
- 1990-04-09 JP JP9332290A patent/JPH03290475A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995019454A1 (en) * | 1994-01-17 | 1995-07-20 | Honda Giken Kogyo Kabushiki Kaisha | Method for recycling aluminum alloy product scraps for automobile |
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