CN1861706A - Method and composition for peeling painting layer from metal surface - Google Patents
Method and composition for peeling painting layer from metal surface Download PDFInfo
- Publication number
- CN1861706A CN1861706A CN 200610088661 CN200610088661A CN1861706A CN 1861706 A CN1861706 A CN 1861706A CN 200610088661 CN200610088661 CN 200610088661 CN 200610088661 A CN200610088661 A CN 200610088661A CN 1861706 A CN1861706 A CN 1861706A
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- CN
- China
- Prior art keywords
- coating
- tank body
- top cover
- yue
- metallic surface
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Abstract
The provided water-bearing compound to peel off paint coating from metal surface, such as the un-flattened Al beverage can, comprises: 6.5-7.5v% HF, 5-15v% HCOOH, and 15-25v% CH<SUB>3</SUB>Cl. Besides, the corresponding method with three steps is simple. This invention has well economic benefit.
Description
Technical field
The present invention relates to be used for comprise the aqueous composition of aluminium sur-face peeling paint coating from the metallic surface.Also relate to the method for using described composition peeling painting layer, it comprises from aluminum beverage pot removes paint coating, and reclaims the beverages can after peeling off.
Background technology
The recovery of conventional beverage jar relates to from street litter bin or food and beverage market collection beverages can empty and that be dropped.Because these beverages cans are generally aluminum and therefore lighter relatively, can load a large amount of beverages cans with a sack so reclaim the gatherer of article, this can become inconvenient greatly owing to the volume of sack.The gatherer tends to beverages can be flattened the volume that reduces loading with pin or other simple tools.
The beverages can of collecting that is crushed can be sold to reclaiming the article collecting field, and beverages can further be flattened or be compacted into piece there.As U.S. Patent No. 5,887, described in 696, trial is introduced transportable workplace (cabins) as aluminium pot collection centre, has wherein described to have the workplace that is used for the integrated machine that beverages can is flattened and provides the reward certificate to the gatherer who brings these beverages cans.
The compacting block that flattens beverages can be admitted to smelting furnace subsequently, and the aluminium pot piece of compacting is heated to fusing point there, the paint coating on beverages can under this fusing point or burning of paint label or evaporation, and the aluminium of remaining fusing forms aluminium ingot.Aluminium ingot can be used for regeneration product aluminium pot by roller mill then.The conventional beverage jar reclaims the several problems that exist in the industry and is summarized as follows.
Aluminium alloy can melts the decomposition that needs a large amount of energy consumptions and may cause different-alloy component such as silicon, magnesium or calcium under high melting temperature.Conventional aluminium alloy can is generally 2 chip architectures, promptly comprises tubular tank body and top cover.
The aluminium alloy of tank body is rich in silicon usually so that it can be formed the tubular tank body by deep-drawing, and the opening of one end can be covered with the form to hydraulic seal by top cover.Top cover is generally rich calcium or rich magnalium to satisfy the hardness demand.Melting process may change the composition of aluminium alloy and therefore the aluminium of fusing may need carry out alloying again to aluminium, and this can produce extra cost recovery.
A kind of minimized method of alloying that makes again is to separate tank body and top cover by scribing or cutting, and is disclosed among 936 (Valihura) as U.S. Patent No. 5,974, thereby can handle the jar part with different components respectively.Yet being cut also, isolating tank body still can scribble paint.
Paint on the jar of compacting and coating may form dry slag on the aluminium of fusing.If heavy metal such as lead, or titanium dioxide is used in the paint, the burning of dry slag may cause forming poisonous particulate matter, and as dioxin, and these toxic substances need be removed from the flue gas of discharging.This need invest on filtering system such as wet type air fly-ash separator, so that removed wherein this airborne poisonous particle, pollutent, poison gas and stink before industrial gaseous waste discharges into atmosphere.
Summary of the invention
Prior art is not found following being used for from the composition of metallic surface peeling painting layer as yet, it comprises hydrofluoric acid, formic acid and methyl chloride, and described composition has formed embodiment extensive and general among the present invention.
The present invention's expection is in one way from the aluminum beverage pot peeling painting layer, this mode is avoided coat of painting or is comprised that the paint film of coating itself is dissolved in the stripping solution, but play the effect that makes the coating dislocation, thereby make the coating can be with monolithic membrane or enough greatly break away from aluminium pot, and can easily be eliminated and dispose with the form of chips that can be filtered or catch.
The present invention also expects and separates the each several part of beverages can so that thereby being eliminated the each several part of the jar of coating can be rolled machine flattening and compacting and directly utilize again according to the aluminium alloy component, and need not fusing and alloying again.
In a first aspect of the present invention, provide a kind of and be used for from the aqueous composition of metallic surface peeling painting layer, wherein, in volume ratio (v/v), said composition comprises:
The hydrofluoric acid of-Yue 6.5%-7.5% (HF);
The formic acid of-Yue 5%-15% (HCOOH); With
Methyl chloride (the CH of-Yue 15%-25%
3Cl);
Preferably, provide about 6.9% hydrofluoric acid (HF), about 10% formic acid (HCOOH) and about 21% methyl chloride (CH by volume
3Cl).As the example of forming above-mentioned composition, adding 1000ml is that the formic acid (HCOOH) and the 2100ml of liquid juice form are the methyl chloride (CH of liquid juice form substantially substantially in the hydrofluoric acid (HF) of about 55% concentration of 1250ml
3Cl), wherein add entry to be mixed with 10, the cumulative volume of 000ml.
In a second aspect of the present invention, be provided for may further comprise the steps from the method for metallic surface peeling painting layer:
-on coating, applying stripping solution, wherein said stripping solution comprises (pressing v/v):
The hydrofluoric acid of-Yue 6.5%-7.5% (HF);
The formic acid of-Yue 5%-15% (HCOOH); With
Methyl chloride (the CH of-Yue 15%-25%
3Cl);
-make above-mentioned solution effects on coating, break away from described metallic surface basically up to described coating; With
-separate the coating that breaks away from from described metallic surface.
Aforesaid metallic surface can comprise aluminum beverage pot or have the similar article that can be dipped into the surface in the bath that contains stripping solution.Preferably, aluminum beverage pot is essentially the sheet that is not crushed.
In a third aspect of the present invention, before the processing according to this method, aluminium pot is cut so that top cover separates with tank body.Preferably, the japanning of tank body partly is cut separation and correspondingly processed.The preferred implementation of cutting and separating method may further comprise the steps:
-be tank body and top cover with the jar cutting and separating;
-with the solution-treated tank body so that coating break away from from tank body;
-remove the coating of disengaging with pending;
-clean tank body with remove basically solution and
-a plurality of tank bodies are flattened and compacting with utilization again;
-collect a plurality of top covers to utilize again.
Preferably, the japanning of jar is partly immersed continue about 15-20 second in the aqueous composition of novelty of the present invention.The coating that breaks away from can be rinsed to pH neutral and collect then with pending.
In a fourth aspect of the present invention, top cover is further cut so that the top cover edge separates with top cover.
Embodiment
As generally and widely embodiment of the present invention, be used for comprising hydrofluoric acid (HF), formic acid (HCOOH) and methyl chloride (CH from the composition of metallic surface peeling painting layer
3Cl) aqueous mixture.This aqueous mixture by volume, can comprise the formic acid (HCOOH) of the hydrofluoric acid (HF) of about 6.5%-7.5%, about 5%-15% and the methyl chloride (CH of about 15%-25%
3Cl), wherein add entry to reach 100%.
Preferred compositions is to provide about 6.9% hydrofluoric acid (HF), about 10% formic acid (HCOOH) and about 21% methyl chloride (CH with volume ratio
3Cl) aqueous mixture.The embodiment that how to mix aqueous composition below is provided.
Embodiment 1
The compound that constitutes aqueous solution adds in the following manner:
-1250ml concentration is about 55% hydrofluoric acid (HF);
-1000ml is the formic acid (HCOOH) of liquid juice form substantially;
-2100ml is the methyl chloride (CH of liquid juice form substantially
3Cl);
Add entry then therein, to be mixed with 10, the cumulative volume of 000ml.
It is emphasized that composition of the present invention is not to be configured coating dissolved mode or use.Preferably, do not contain ethanol in the said composition.This composition is so that coating breaks away from from the metallic surface but not the dissolved mode is configured and uses.The form of the film that the coating that breaks away from will can be removed by full wafer with one deck is separated with jar.For better application, jar should be preferably processed with the shape of not flattening so that above-mentioned chemical composition can act on the coating of flat surface rather than must infiltrate be crushed or compacting jar fold and crease in.
For applying paint coating, the aluminium surface is not a kind of good substrate surface usually, and paint coating can peel off after for some time.Therefore, the beverages can surface is coated with skim priming paint or jointing material usually earlier, as Sudan Gum-arabic, comes assistant coating to be bonded in a jar surface.Apply one deck then and coat with lacquer on coating so that the gloss finishing to be provided, label that this also helps jar or paint coating are in lip-deep bonding and the being kept perfectly property of aluminium.Think and the present invention includes in the chemical composition of composition methyl chloride (CH
3Cl) destroy enamelled coating and/or Sudan Gum-arabic, and hydrofluoric acid (HF) and formic acid (HCOOH) help this process.
The method for compositions of using novelty of the present invention may further comprise the steps: the solution that will have above-mentioned composition is applied to coating, solution effects is broken away from from the metallic surface basically up to this coating on coating, with the coating of separating disengaging from the metallic surface, this metallic surface comprises the aluminium surface of beverages can.
Beverages can be dipped into about 15-20 second in the bath that contains the solution with above-mentioned concentration chemical composition makes it break away from from the aluminium pot body so that chemical can act on the coating.What deserves to be mentioned is that soak time can change according to the concentration of used chemical composition,, that is, adopt long soak time if concentration reduces, if opposite concentration increase then adopt short soak time to be fit to the mechanism of dip operation.
Because coating breaks away from the form of the fragment of single film or sufficient size, it can by the simple lift-over mode in above-mentioned bath for example oscillating motion separate from described jar.Heavier jar can be lowerd or be immersed deeplyer in bath, and coated membrane can be by filter screen or electric current (current flow) removing like this.In order to promote coating to float on solution surface, bath solution can add additive increases its relative density.
In another aspect of this invention, aluminium pot can be cut to separate top cover from tank body before soaking the removing coating.As explaining in the above-mentioned background technology part, so common rich calcium of top cover or rich magnesium because the aluminium alloy of tank body is rich in silicon usually are with the jar cutting be separated into tank body part and header field can be avoided in two kinds of different aluminum alloys separately alloying process again.Beverages can is separated into different piece be may further comprise the steps with the typical method of separate treatment:
-be tank body and top cover with the jar cutting and separating;
-with the solution-treated tank body so that coating break away from from tank body;
-remove the coating of disengaging with pending;
-clean tank body so that do not contain solution and
-a plurality of tank bodies are flattened and compacting with utilization again;
-collect a plurality of top covers to utilize again.
Preferably, the solution of use is aforesaid aqueous composition, and treatment process comprises tank body is immersed based in the solution of the used chemical composition of above-mentioned concentration about 15 to 20 seconds.
Utilize this method, the part separately of the beverage tank body of separated or decoating and top cover contains different aluminium alloy components, can be collected respectively and utilizes by their are flattened and are compacted into the piece that contains the same alloy component again.According to this separation of aluminium alloy character, can avoid being fused into ingot and alloying again, embody very big saving thus at the energy with on the time.The recovery aluminium block that is compacted can be directly used in by roller mill and make beverages can or other have the aluminum products of same alloy character.
The coating that breaks away from all is individual or enough big form of chips to be filtered or to catch, and can be collected and wash away through flushing then that acidic solution is residual approximately to be neutrality until its pH value.The coating that breaks away from can be collected as objectionable impurities and handle accordingly after filtering.
In another aspect of the present invention, be cut and further cut so that its edge is separated with top cover with the isolating top cover of tank body.This additional step that cuts away the edge be because, the edge is a kind of anti-leakage seam, it forms by the peripheral edge of tank body that peripheral bead or bending is scribbled in advance paint.Therefore, the top of tank body, promptly above-mentioned peripheral edge will be in case the leakage mode be inserted in the edge flanging, and the latter installs top cover with curling along peripheral edge in the process that forms anti-leakage seam above tank body simultaneously.
Perhaps, solution of the present invention can not reach the coating layer portion in the anti-leakage seam, even and can, coating wherein can not discharge from seam yet.Therefore, if top cover is compacted under the complete situation in edge, the edge can leave the coated substance that influences the aluminium alloy component so.For captive coated substance, the top cover that is compacted may be not suitable for roller mill and handle, and these top covers that are compacted need be melted so that captive coating can burn under high smelting temperature.The aluminium of fusing also need be before being cast into the ingot that is used for roller mill alloying again.
Should be appreciated that, above-mentioned numerous characteristics can be adopted in combination, modification, reconstruct or optionally change to reach notion, characteristic and the principle of work identical with the present invention, the present invention aims to provide the composition that is used for from aluminium sur-face peeling paint coating, and according to the difference of its aluminium alloy component the beverages can each several part is carried out cutting and separating.
For example, even can use other organic acids such as the acetate of different concns to replace formic acid.Methylene dichloride (CH
2Cl
2) may be used as a kind of known solvent, or may discharge the precursor generation methyl chloride (CH of chlorine as reaction
3Cl).Hydrofluoric acid (HF) can be replaced by suitable etch solution, reaction accelerator or promotor.
These change and selectable embodiment, as selectable combination or the embodiment of not describing but still can be used to put into practice effectively notion of the present invention and principle of work herein in detail, can replace aforesaid part, component, material, step or process.Therefore, they should not be considered to run counter to of the present invention, will be understood that on the contrary to drop in the form and scope of claims.
Claims (20)
1. be used for from the aqueous composition of metallic surface peeling painting layer, it comprises in volume ratio:
The hydrofluoric acid of-Yue 6.5%-7.5% (HF);
The formic acid of-Yue 5%-15% (HCOOH); With
Methyl chloride (the CH of-Yue 15%-25%
3Cl).
2. aqueous composition according to claim 1, wherein
-hydrofluoric acid (HF) about 6.9%;
-formic acid (HCOOH) about 10%; With
-methyl chloride (CH
3Cl) about 21%.
3. aqueous composition according to claim 1 and 2, the described formation compound of wherein following adding:
-1250ml concentration is about 55% hydrofluoric acid (HF);
-1000ml is the formic acid (HCOOH) of liquid juice form substantially;
-2100ml is the methyl chloride (CH of liquid juice form substantially
3Cl);
And add entry, to be mixed with 10, the cumulative volume of 000ml.
4. be used for from the method for metallic surface peeling painting layer, it may further comprise the steps:
-stripping solution is applied to described coating, wherein said stripping solution comprises in volume ratio:
The hydrofluoric acid of-Yue 6.5%-7.5% (HF);
The formic acid of-Yue 5%-15% (HCOOH); With
Methyl chloride (the CH of-Yue 15%-25%
3Cl);
-described solution effects is broken away from from described surface up to described coating basically in described coating; With
-separate the coating of described disengaging from described metallic surface.
5. method according to claim 4, wherein, described metallic surface is the surface of aluminum beverage pot.
6. according to claim 4 or 5 described methods, will comprise that wherein the article of described metallic surface or aluminum beverage pot immersion contain in the bath of described stripping solution.
7. method according to claim 5, wherein, described aluminum beverage pot is the sheet that is not crushed basically.
8. method according to claim 5 wherein, before handling according to described method, is cut described aluminium pot so that top cover is separated with tank body.
9. method according to claim 5, wherein, the part that scribbles paint of described tank body is cut separation to handle by described method.
10. be used to reclaim the method for aluminum beverage pot, it may further comprise the steps:
-be tank body and top cover with described jar cutting and separating;
-use the described tank body of solution-treated so that coating breaks away from from described tank body;
-remove the coating of described disengaging with pending;
-clean described tank body with make basically its do not contain described solution and
-a plurality of described tank bodies are flattened and compacting with utilization again;
-collect a plurality of described top covers to utilize again.
11. method according to claim 10 wherein, is washed coating to the pH neutral of described disengaging and is collected then with pending.
12. method according to claim 10, use therein described stripping solution are according to each described aqueous composition of claim 1-3.
13., wherein immerse according to about 15-20 second in each described aqueous composition of claim 1-3 to the described jar part that scribbles paint of major general according to each described method of claim 4-12.
14. method according to claim 10 is wherein further cut described top cover so that the top cover edge is separated with top cover.
15. use is according to each described composition of claim 1-3 or use the paint coating of peeling off from the metallic surface according to each described method of claim 4-13.
16. metal, its surperficial paint coating are stripped from according to each described method of claim 4-13 by using according to each described composition of claim 1-3 or using.
17. metal according to claim 16, it is the part of aluminum beverage pot or aluminum beverage pot.
Be used as a plurality of of roller mill feed 18. be compacted into piece according to claim 15 or 16 described metals.
19. be fit to the roller mill of the rolling piece that is compacted according to claim 18.
20. aluminum products, it is made by the described piece that is compacted of claim 18, and it comprises beverages can.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| MYPI20052138 | 2005-05-12 | ||
| MYPI20052138 | 2005-05-12 |
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| Publication Number | Publication Date |
|---|---|
| CN1861706A true CN1861706A (en) | 2006-11-15 |
Family
ID=37389241
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610088661 Pending CN1861706A (en) | 2005-05-12 | 2006-05-12 | Method and composition for peeling painting layer from metal surface |
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| CN (1) | CN1861706A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109563427A (en) * | 2017-05-26 | 2019-04-02 | 诺维尔里斯公司 | For will from removal coat system cyclone dust briquetting system and method |
| CN109939984A (en) * | 2019-03-19 | 2019-06-28 | 柴瑞贤 | A kind of Oil Paint Slag recycling equipment |
-
2006
- 2006-05-12 CN CN 200610088661 patent/CN1861706A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109563427A (en) * | 2017-05-26 | 2019-04-02 | 诺维尔里斯公司 | For will from removal coat system cyclone dust briquetting system and method |
| CN109939984A (en) * | 2019-03-19 | 2019-06-28 | 柴瑞贤 | A kind of Oil Paint Slag recycling equipment |
| CN109939984B (en) * | 2019-03-19 | 2021-09-03 | 盐城东方天成机械有限公司 | Paint slag recycling equipment |
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