JPH0679226A - Aluminum material for can top - Google Patents
Aluminum material for can topInfo
- Publication number
- JPH0679226A JPH0679226A JP25536192A JP25536192A JPH0679226A JP H0679226 A JPH0679226 A JP H0679226A JP 25536192 A JP25536192 A JP 25536192A JP 25536192 A JP25536192 A JP 25536192A JP H0679226 A JPH0679226 A JP H0679226A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- water
- aluminum
- corrosion resistance
- base
- 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
- 239000000463 material Substances 0.000 title claims abstract description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 47
- 239000011248 coating agent Substances 0.000 claims abstract description 44
- 238000011282 treatment Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 abstract description 12
- 230000007797 corrosion Effects 0.000 abstract description 12
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 abstract 2
- 238000006757 chemical reactions by type Methods 0.000 abstract 1
- 230000008021 deposition Effects 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- 239000003973 paint Substances 0.000 description 25
- 239000002904 solvent Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- WMYWOWFOOVUPFY-UHFFFAOYSA-L dihydroxy(dioxo)chromium;phosphoric acid Chemical compound OP(O)(O)=O.O[Cr](O)(=O)=O WMYWOWFOOVUPFY-UHFFFAOYSA-L 0.000 description 4
- 239000011651 chromium Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007739 conversion coating Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000005007 epoxy-phenolic resin Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は缶蓋用アルミニウム材に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum material for a can lid.
【０００２】[0002]
【従来の技術】従来から、飲料缶、食缶等の缶蓋には、
アルミニウム合金材が用いられている。従来の缶蓋用ア
ルミニウム材は、アルミニウム合金板に脱脂、エッチン
グ処理を行い、通常の燐酸クロメート処理を施した後、
塩化ビニール樹脂系塗料やエポキシフェノール樹脂系塗
料などの溶剤型塗料を塗布、乾燥し、缶蓋用アルミニウ
ム材を得ている。次いでこのアルミニウム材を缶蓋型に
成形加工し、缶蓋として使用している。2. Description of the Related Art Conventionally, can lids such as beverage cans and food cans have been
Aluminum alloy material is used. The conventional aluminum material for can lids is degreased and etched on an aluminum alloy plate, and then subjected to ordinary phosphoric acid chromate treatment,
Solvent-based paints such as vinyl chloride resin paints and epoxy phenolic resin paints are applied and dried to obtain aluminum materials for can lids. Next, this aluminum material is formed into a can lid shape and used as a can lid.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の缶蓋材に使
用される塗料は溶剤型塗料であり、塗装時の作業環境、
乾燥焼付け時の排気ガスによる汚染、臭気が問題であっ
た。また、塗料中に多量に含まれる溶剤は乾燥時に蒸発
してしまい乾燥後の塗膜には残らないため、省資源の観
点からも問題であった。とくに、近年の酸性雨、地球温
暖化等の環境問題から、溶剤量の少ない塗料が望まれて
おり、水性塗料やハイソリッド塗料の開発が進められて
いる。水性塗料による塗装は電着塗装、粉体塗装、スプ
レー塗装などの塗装方法で、自動車や缶ボディー材など
の分野で実施されている。The paint used for the above-mentioned conventional can lid materials is a solvent type paint, and the work environment at the time of painting,
There were problems with exhaust gas pollution and odor during dry baking. Further, the solvent contained in a large amount in the paint is evaporated during drying and does not remain in the coating film after drying, which is also a problem from the viewpoint of resource saving. In particular, due to recent environmental problems such as acid rain and global warming, paints with a small amount of solvent are desired, and water-based paints and high solid paints are being developed. Coating with water-based paints is carried out in fields such as automobiles and can body materials by coating methods such as electrodeposition coating, powder coating and spray coating.
【０００４】しかし、水性塗料は塗膜が乾きやすく、水
分が完全に蒸発する前に塗膜表面が乾燥し、その後塗膜
中の水分が蒸発する時に塗膜にフクレを生じる現象（以
後この現象を「ワキ」と称する。）が起こる。ワキは乾
燥時間が短くなる程発生しやすく、特に短時間焼付けと
なるコイルコーティングではワキの発生が激しく、問題
となる。また、耐食性を必要とする場合には従来の溶剤
型塗料では塩化ビオルガノゾル塗料を１００〜１３０mg
/dm2塗布しているが、このように膜厚を厚くした場合に
もワキが多く発生する。このワキの発生は製品の外観不
良あるいは性能不良となる。従来ワキをなくすために
は、塗料中の溶剤種、樹脂等を改良する、ラインス
ピードを下げて昇温スピードを遅くし、加熱時間を長く
する、塗布量を少なくする等の方法がとられてきた。
しかし、の塗料の改良による方法は開発に長時間を必
要とし、塗膜性能を満足するものはまだ得られていな
い、のラインスピードを低下させる方法は高速化を目
的とするコイルコーティングでは生産性が低下し問題で
ある、また、の塗布量を少なくした場合には耐食性な
どの塗膜性能を満足できない等の問題がある。また、従
来の燐酸クロメート処理剤は、６価のＣｒ等の有害物質
を含み廃水処理が必要であった。However, the water-based paint tends to dry the coating film, the surface of the coating film dries before the water completely evaporates, and when the water in the coating film evaporates thereafter, blisters occur in the coating film (hereinafter, this phenomenon). Is called "armpit"). Armpits are more likely to occur as the drying time becomes shorter. In particular, coil coating, which is baked for a short period of time, causes armpits to be a serious problem. When corrosion resistance is required, the conventional solvent-based paint is 100-130 mg of chloride organoorgano paint.
Although / dm 2 is applied, even when the film thickness is increased in this way, a lot of armpits occur. The occurrence of this cracking causes a poor appearance or poor performance of the product. Conventionally, in order to eliminate armpits, methods such as improving the solvent species in the paint, resin, etc., decreasing the line speed to slow down the temperature rising speed, lengthening the heating time, reducing the coating amount, etc. have been taken. It was
However, the method by improving the paint requires a long development time, and the one that satisfies the coating film performance has not yet been obtained.The method for reducing the line speed is for the purpose of speeding up coil coating. There is a problem that the coating film performance such as corrosion resistance cannot be satisfied when the coating amount is reduced. Further, the conventional phosphoric acid chromate treatment agent contains a harmful substance such as hexavalent Cr and requires the treatment of waste water.
【０００５】[0005]
【課題を解決するための手段】本発明者は、上記従来の
問題に鑑み、通常の燐酸クロメート処理後における水性
塗料の塗布、乾燥とワキ発生の関係を種々検討した結
果、化成処理後の表面皮膜の親水性及び接触角とワキの
発生状況が関係していることを発見した。本発明はこの
知見に基づいてさらに検討を重ね完成するに至ったもの
である。すなわち本発明は、（１）塗装の下地処理とし
てＺｒ付着量が１０〜５０mg/m2 となる化成処理を行っ
た後、水性塗料を塗布、乾燥させてなることを特徴とす
る缶蓋用アルミニウム材を提供するものである。本発明
で用いられる水性塗料としては、特にアクリル−エポキ
シ樹脂系のエマルジョン型塗料が缶蓋用塗料として好ま
しい。In view of the above-mentioned conventional problems, the present inventor has conducted various studies on the relationship between the application and drying of an aqueous paint after the usual phosphoric acid chromate treatment and the occurrence of armpits. It was discovered that the hydrophilicity of the film and the contact angle are related to the occurrence of armpits. The present invention has been completed based on this finding after further studies. That is, the present invention is characterized in that (1) as a base treatment for coating, a chemical conversion treatment with a Zr adhesion amount of 10 to 50 mg / m 2 is performed, and then a water-based paint is applied and dried. The material is provided. As the water-based paint used in the present invention, an acrylic-epoxy resin-based emulsion type paint is particularly preferable as a can lid paint.
【０００６】本発明では、アルミニウム合金材の下地処
理としてＺｒ系化成処理を施し、水性塗料を塗布乾燥す
ることにより、ワキの発生を抑えることが可能になる。
本発明においてＺｒ付着量は１０〜５０mg/m2 とする。
Ｚｒ付着量が１０mg/m 2 未満では塗膜の密着性、耐食性
が劣る。また、Ｚｒ付着量が５０mg/m2 を越えると成形
加工時の化成皮膜の割れ等により、耐食性が劣る結果と
なる。本発明の缶蓋用アルミニウム材において、下地の
Ｚｒ皮膜を得る方法としては、反応型クロメート処理で
も塗布型クロメート処理でもよく、公知の各種の方法を
用いることができる。本発明の缶蓋用アルミニウム材へ
の水性塗料の塗布には、通常使用されている水性塗料及
び塗装方法を用いることができる。水性塗料塗装後の塗
膜乾燥工程には、焼き付け乾燥等の通常の乾燥方法が用
いられる。According to the present invention, a base treatment of an aluminum alloy material is performed.
As a matter of fact, Zr-based chemical conversion treatment is applied, water-based paint is applied and dried
By doing so, it is possible to suppress the occurrence of armpits.
In the present invention, the Zr adhesion amount is 10 to 50 mg / m2 And
Zr adhesion amount is 10 mg / m 2 If less than, the adhesion and corrosion resistance of the coating film
Is inferior. Also, the Zr adhesion amount is 50 mg / m2 Molding over
Corrosion resistance is inferior due to cracking of the chemical conversion coating during processing.
Become. In the aluminum material for a can lid of the present invention,
As a method of obtaining a Zr film, reactive chromate treatment is used.
Alternatively, coating type chromate treatment may be used, and various known methods may be used.
Can be used. To Aluminum Material for Can Lids of the Present Invention
For the application of the water-based paint of
And coating methods can be used. Coating after coating with water-based paint
Normal drying methods such as baking drying are used in the film drying process.
Can be
【０００７】[0007]
【実施例】以下に本発明を実施例に基づきさらに詳細に
説明するが、本発明はこれに限定されるものではない。 実施例 アルミニウム合金板（ＪＩＳＡ５１８２ 板厚０．３ｍ
ｍ）に次のような脱脂、エッチング処理を行った。〔脱
脂〕日本ペイント株式会社製のサーフクリーナー３２２
Ｎ−８を用いて塗布量が２重量％となるように、６５℃
で５秒間スプレー処理を行った後、水洗した。〔エッチ
ング〕日本ペイント株式会社製のサーフクリーナー４２
０Ｎ−２を用いて塗布量が２重量％となるように、６５
℃で５秒間スプレー処理を行った後、水洗した。次に、
Ｚｒ処理として日本ペイント株式会社製のアルサーフＬ
Ｘ９１−３０１を用いて塗布量が３重量％となるよう
に、４５℃で１秒〜１０秒間スプレー処理を行った後、
水洗した。また、比較のため、通常の燐酸クロメート処
理として日本ペイント株式会社製のアルサーフ４０１及
びアルサーフ４５を用いてそれぞれ塗布量が２．５重量
％及び０．５重量％となるように、４５℃で４秒間スプ
レー処理を行った後、水洗した。次に、上記化成処理板
をエポキシ−アクリル樹脂系のエマルジョンタイプの水
性塗料を用いて、塗布量が１００〜１４０mg/dm2となる
ようにロールコーターで塗装し、２５０℃で３０秒間の
焼付け乾燥を行い塗装板を得た。得られた塗装板は、塗
膜外観評価を行い、スコアー加工とタブ付けまで行った
缶蓋成形品の耐食性及びフェザリング性を評価した。結
果を表１に示す。The present invention will be described in more detail based on the following examples, but the invention is not intended to be limited thereto. Example Aluminum alloy plate (JIS A5182 plate thickness 0.3 m
m) was subjected to the following degreasing and etching treatments. [Degreasing] Surf paint 322 made by Nippon Paint Co., Ltd.
Use N-8 so that the coating amount becomes 2% by weight, and 65 ° C.
After spraying for 5 seconds, it was washed with water. [Etching] Surf Cleaner 42 made by Nippon Paint Co., Ltd.
Use 0N-2 to adjust the coating amount to 2% by weight.
After spraying at 5 ° C for 5 seconds, it was washed with water. next,
Alsurf L manufactured by Nippon Paint Co., Ltd. for Zr treatment
After spraying at 45 ° C. for 1 second to 10 seconds using X91-301 so that the coating amount becomes 3% by weight,
Washed with water. For comparison, Alsurf 401 and Alsurf 45 manufactured by Nippon Paint Co., Ltd. were used as usual phosphoric acid chromate treatments so that the coating amounts were 2.5% by weight and 0.5% by weight, respectively. After spraying for a second, it was washed with water. Next, the above chemical conversion treatment plate is coated with an epoxy-acrylic resin emulsion type water-based coating material by a roll coater so that the coating amount is 100 to 140 mg / dm 2, and baked and dried at 250 ° C. for 30 seconds. The coated plate was obtained. The obtained coated plate was evaluated for coating film appearance, and evaluated for corrosion resistance and feathering property of a can lid molded product which was subjected to score processing and tab attachment. The results are shown in Table 1.
【０００８】[0008]
【表１】 [Table 1]
【０００９】塗膜外観評価は目視にて、ワキの発生の有
無を評価した。耐食性評価は缶蓋成形品をクエン酸にて
ｐＨ ３に調整した１％ＮａＣｌ溶液中に缶蓋材外面を
シーリングして、５０℃で２ケ月間浸漬し、目視にて缶
蓋内面の腐食状況を評価した。フェザリング性は缶蓋成
形品を水道水中に１００℃で３０分間浸漬処理した後、
タブを引っ張った後の開口の塗膜残り巾を測定した。表
１から明らかなように、本発明の缶蓋用アルミニウム材
は、Ｚｒ系化成処理、及び水性塗料を塗布乾燥したこと
により、ワキ等の不良な塗膜外観が無く、フェザリング
性、耐食性ともに優れていることが判る。The appearance of the coating film was visually evaluated for the presence or absence of cracks. Corrosion resistance was evaluated by sealing the outer surface of the can lid material with a 1% NaCl solution adjusted to pH 3 with citric acid and immersing it for 2 months at 50 ° C, and visually observing the corrosion state of the inner surface of the can lid. Was evaluated. Feathering property, after the can lid molded product is immersed in tap water at 100 ° C for 30 minutes,
The residual width of the coating film at the opening after pulling the tab was measured. As is clear from Table 1, the aluminum material for a can lid of the present invention has no bad coating appearance such as armpits and has no feathering property and corrosion resistance due to the Zr-based chemical conversion treatment and the application and drying of the aqueous coating material. It turns out to be excellent.
【００１０】[0010]
【発明の効果】以上説明したように、本発明の缶蓋用ア
ルミニウム材は、Ｚｒ系化成処理の下地処理を行い、こ
れに水性塗料を塗布乾燥したことにより、ワキ等の不良
な塗膜外観が無く、フェザリング性、耐食性ともに優れ
る。また、本発明の缶蓋用アルミニウム材は、クロムを
含有しない化成処理と有機溶剤含有量の少ない水性塗料
のコイルコーティングの普及を可能にし、有機溶剤又は
クロムによる環境汚染の防止に貢献する。As described above, the aluminum material for a can lid of the present invention undergoes a Zr-based chemical conversion treatment as a base treatment and is coated with an aqueous coating material and dried to give a poor coating appearance such as armpits. Excellent in both feathering and corrosion resistance. Further, the aluminum material for a can lid of the present invention enables the chemical conversion treatment containing no chromium and the spread of the coil coating of the water-based paint having a small organic solvent content, and contributes to the prevention of environmental pollution by the organic solvent or chromium.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ２２Ｃ 21/00 Ｅ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location C22C 21/00 E
Claims (1)
成処理を行った後、水性塗料を塗布、乾燥させてなるこ
とを特徴とする缶蓋用アルミニウム材。1. An aluminum material for a can lid, which is obtained by applying a water-based coating and then drying it after performing a chemical conversion treatment to obtain a Zr adhesion amount of 10 to 50 mg / m 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25536192A JPH0679226A (en) | 1992-09-01 | 1992-09-01 | Aluminum material for can top |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25536192A JPH0679226A (en) | 1992-09-01 | 1992-09-01 | Aluminum material for can top |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0679226A true JPH0679226A (en) | 1994-03-22 |
Family
ID=17277714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25536192A Pending JPH0679226A (en) | 1992-09-01 | 1992-09-01 | Aluminum material for can top |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0679226A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006297328A (en) * | 2005-04-22 | 2006-11-02 | Yamaha Motor Co Ltd | Method for forming coating film on aluminum substrate |
| JP2007076651A (en) * | 2005-09-09 | 2007-03-29 | Toyo Seikan Kaisha Ltd | Aluminum alloy can lid with excellent corrosion resistance and adhesion and method for producing the same |
| JP2007126549A (en) * | 2005-11-02 | 2007-05-24 | Sumitomo Light Metal Ind Ltd | Water-based paint for can lid, pre-coated aluminum alloy plate for can lid and method for producing the same |
-
1992
- 1992-09-01 JP JP25536192A patent/JPH0679226A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006297328A (en) * | 2005-04-22 | 2006-11-02 | Yamaha Motor Co Ltd | Method for forming coating film on aluminum substrate |
| JP2007076651A (en) * | 2005-09-09 | 2007-03-29 | Toyo Seikan Kaisha Ltd | Aluminum alloy can lid with excellent corrosion resistance and adhesion and method for producing the same |
| JP2007126549A (en) * | 2005-11-02 | 2007-05-24 | Sumitomo Light Metal Ind Ltd | Water-based paint for can lid, pre-coated aluminum alloy plate for can lid and method for producing the same |
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