CN105670375B - A kind of polyester enamelled wire paint removing process and device - Google Patents
A kind of polyester enamelled wire paint removing process and device Download PDFInfo
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- CN105670375B CN105670375B CN201610162395.4A CN201610162395A CN105670375B CN 105670375 B CN105670375 B CN 105670375B CN 201610162395 A CN201610162395 A CN 201610162395A CN 105670375 B CN105670375 B CN 105670375B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D9/00—Chemical paint or ink removers
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The present invention relates to a kind of polyester enamelled wire paint removing process, include the following steps：1) paint stripper is added in lye tank (vat), and is heated to the paint film treatment temperature of polyester enamelled wire；The paint stripper is sodium hydroxide and/or potassium hydroxide inorganic alkali solution；The mass concentration of the inorganic alkali solution is 10~40%；2) paint stripper in lye tank (vat) is pumped into the depainting bottom of the barrel with agitating paddle；It will wait for that the polyester enamelled wire of depainting is put into depainting bucket；3) start to stir after overflow, rotating speed is 30~300 turns per minute；The paint film to fall off flows into filter vat as paint stripper is from the overflow launder spilling at the top of depainting bucket；4) paint film and paint stripper to fall off detaches in filter vat, and paint stripper goes successively to lye tank (vat).The invention further relates to a kind of devices of polyester enamelled wire depainting.The technique and device are easy to operate, applied widely, paint removing effect is good, it is non-volatile, to metal base corrosion less, can high-volume depainting.
Description
Technical field
The present invention relates to enameled wire depainting technical fields, and in particular to a kind of polyester enamelled wire paint removing process and device.
Background technology
Polyester enamelled wire is a kind of common industrial consumptive material, and the matrix copper wire in polyester enamel covered wire is anaerobic or hypoxemia copper
Bar, copper content are good copper scrap resources 95% or more, utilize suitable for Direct Regeneration, are needed before being recycled to copper scrap
The Polyester Paint on polyester enamelled wire surface is removed.Currently, industrial mainly using combustion method or Mechanical Method to polyester enamelled wire
Carry out depainting.Using combustion method depainting, environment is not only polluted, gives off environmentally harmful exhaust gas, and can be to needing to recycle
Copper material quality produce serious influence, be also unfavorable for the recycling of surface polyester coatings in addition.Using Mechanical Method depainting
Have the shortcomings that cumbersome, time-consuming and laborious, paint removal efficiency is low, copper recovery is low etc..
In recent years, some paint removing process are disclosed, as patent of invention CN101709172A uses a kind of paint stripper, the depainting
Agent is made of dichloromethane, methanol, nitric acid, atoleine, X 2-1401 etc.；Patent of invention CN1590474A is adopted
With a kind of for polyester, the paint stripper of polyesterimide enameled copper round wire paint film, including formic acid, chloroform, cresols, addition
Agent etc..Paint stripper contains the organic solvents such as low boiling point halogenated hydrocarbons in these patented technologies, and operation operating mode is poor, and pollutes environment,
The waste water of generation is difficult.
In recent years, some enameled wire paint removing process are disclosed, as patent of invention CN103106986A disclose it is a kind of from useless
The technique that copper is recycled in old machine winding, paint stripper are the mixed liquor of sodium hydroxide solution and banana oil, and paint removing process is anti-
Multiple agitating friction to paint stripper is in argillaceous, but the technique paint stripper can not be recycled using rear sticky, banana oil there is also
The problems such as low boiling point, poor safety；Patent of invention CN102558940A discloses a kind of stripping method and paint stripper of enameled wire,
Paint removing process is that sodium hydroxide and potassium hydroxide are poured into nickel crucible the melting mixing that heats up, and enameled wire is then needed depainting
One end, which is immersed in paint stripper, carries out depainting, is washed the enameled wire respectively after depainting, pickling and washing, but the technique is only
It is suitable for a small amount of enameled wire depainting, is mainly used for the depainting of enameled wire joint, is not suitable for extensive depainting.Patent of invention
CN1175111A discloses a kind of method recycling copper from winding, and paint removing process is that the winding that enameled wire is constituted is immersed in highly basic
It in solution, then washes, but treated that lye is sticky for this method, contains big weight polyester catabolite in water lotion, at waste water
Reason is difficult, can not recycle.
Invention content
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of easy to operate, applied widely, depainting effect
Fruit is good, it is non-volatile, to metal base corrosion less, can high-volume depainting polyester enamelled wire paint removing process and device.
Technical solution provided by the present invention is：
A kind of polyester enamelled wire paint removing process, includes the following steps：
1) paint stripper is added in lye tank (vat), and is heated to the paint film treatment temperature of polyester enamelled wire；The depainting
Agent is sodium hydroxide and/or potassium hydroxide inorganic alkali solution；The mass concentration of the inorganic alkali solution is 10~40%；
2) paint stripper in lye tank (vat) is pumped into the depainting bottom of the barrel with agitating paddle；It will wait for that the polyester enamelled wire of depainting is put
Enter in depainting bucket；
3) start to stir after overflow, rotating speed is 30~300 turns per minute；The paint film to fall off is as paint stripper is from depainting bucket top
The overflow launder in portion overflows, and flows into filter vat；
4) paint film and paint stripper to fall off detaches in filter vat, and paint stripper goes successively to lye tank (vat).
Polyester enamelled wire surface film complex cross-linked, chemical property is more stable, common solvent be difficult to it is degradable to its,
But the molecular chain rupture under highly basic effect of the ester bond in polymer paint film, makes the binding force between paint film reduce.But polyester paint film
It is standing and soak for for a long time in hot alkaline solution, the paint film to fall off may be caused to degrade to obtain too severe and etching of copper lines, after influencing
Continuous operation.Therefore, paint removing process of the invention carries out depainting to polyester enamelled wire simultaneously using paint stripper and mechanical agitation, and two
Person mutually acts synergistically.Paint stripper is inorganic alkali solution, sodium hydroxide and potassium hydroxide solution have to polyester enamelled wire it is excellent
Peeling effect；It will be fallen off in time by paint stripper circulating between lye tank (vat), depainting bucket, overflow launder and filter vat
Paint film separation so that paint stripper will not become because of the presence due to the paint film largely to fall off it is sticky lose continue stripping paint
The effect of film.The technical process can not only accelerate the efficiency of polyester enamelled wire depainting, efficiently reduce the waste of paint stripper, and
And it can be applied to industrialized production.Secondly as the paint removal efficiency of the technique is high, the depainting time is less than 2.5 hours so that poly-
Metal in ester enameled wire is not corroded, and is conducive to recycle.
Preferably, the paint stripper is sodium hydroxide and potassium hydroxide inorganic alkali solution, wherein sodium hydroxide and hydrogen
The mass ratio of potassium oxide is 7.5~8.5：2.Sodium hydroxide has stronger release effect, and hydroxide for polyester enamelled wire
Potassium is stronger to the degradation of paint film, have stronger paint film penetration, the two mixing synergistic effect so that paint removal efficiency into
One step improves.Further preferably, wherein the mass ratio of sodium hydroxide and potassium hydroxide is 8：2, paint removal efficiency is into one under this ratio
Step improves, and the depainting time is less than 0.3 hour.
Preferably, the paint film treatment temperature is 40~105 DEG C.Suitable paint film treatment temperature, can accelerate to take off
Paint.Further preferably, the paint film treatment temperature is 90~100 DEG C.
Preferably, the speed that is pumped into of paint stripper is set for whole paint strippers in depainting bucket per hour in the step 2)
It changes 2~10 times.Suitably being pumped into speed enables to the paint film to fall off to overflow to overflow launder from depainting bucket in time, prevents from falling off
Paint film continued to degrade by paint stripper so that paint stripper become it is sticky lose continue remove paint film effect.Further preferably, it pumps
Enter speed to replace 5 times for whole paint strippers in depainting bucket per hour.
As an improvement, the agitating paddle is 45 ° of oblique paddles or anchor formula paddle.Oblique paddle at 45 ° is arranged in agitating paddle so that Polyester Paint
Envelope curve can be improved paint removal efficiency by radial and axial stirring action power and fricting shearing.
Preferably, the paint stripper is sodium hydroxide and potassium hydroxide inorganic alkali solution, wherein sodium hydroxide and hydrogen
The mass ratio of potassium oxide is 8：2；The mass concentration of the inorganic alkali solution is 28~32%；The paint film treatment temperature is
90~100 DEG C；Rotating speed is 80~120 turns per minute in the step 3)；Paint stripper is pumped into speed in the step 2)
It is replaced 4~6 times for whole paint strippers in depainting bucket per hour；The agitating paddle is 45 ° of oblique paddles.
The present invention also provides a kind of devices of polyester enamelled wire depainting, including lye tank (vat), pump, depainting bucket, filter vat；It is described
Depainting bucket there is agitating paddle, top there is overflow launder, bottom to be connect with lye tank (vat) by pumping；The overflow launder is by paint stripper
It drains into the filter bag of filter vat；Filtrate is collected into lye tank (vat) by the filter vat, and the lye tank (vat) is heated by steam.
The device has the technique effect of above-mentioned polyester enamelled wire paint removing process.
As an improvement, the agitating paddle is 45 ° of oblique paddles or anchor formula paddle.Oblique paddle at 45 ° is arranged in agitating paddle so that Polyester Paint
Envelope curve can be improved paint removal efficiency by radial and axial stirring action power and fricting shearing.
Compared with the existing technology, beneficial effects of the present invention are embodied in：
1) paint stripping rate is fast, and various polyester enamelled wire paint films can be removed in 0.25~2.5 hour；And polyester enamelled wire
Surface film can remove completely；
2) applied widely, various types polyester enamelled wire paint film can be removed, industrialized production is more advantageous to；
3) preparation of paint stripper and, safety easy using operating method, low-cost, paint stripper is recyclable and makes repeatedly
With；
4) copper wire is hardly corroded, content of copper ion is less than 0.01% in paint stripper after reaction；
5) paint film removed in paint stripper will not excessive degradation, paint film can be detached with paint stripper by way of filtering.
Description of the drawings
Fig. 1 is the schematic device of polyester enamelled wire depainting.
Specific implementation mode
The present invention is described in detail with specific embodiment below:
The device of polyester enamelled wire depainting is as shown in Figure 1, including lye tank (vat) 1, pump 2, depainting bucket 3, filter vat 7；Described
There is depainting bucket 3 agitating paddle 4, top there is overflow launder 5, bottom to be connect with lye tank (vat) 1 by pump 2；The overflow launder 5 will take off
Paint agent drains into the filter bag 6 of filter vat 7；Filtrate is collected into lye tank (vat) 1 by the filter vat 7, and the lye tank (vat) 1 passes through
Steam heats.
Polyester enamelled wire paint removing process：1) paint stripper is added in lye tank (vat), and is heated to the paint film of polyester enamelled wire
Treatment temperature；The paint stripper is sodium hydroxide and/or potassium hydroxide inorganic alkali solution；The quality of the inorganic alkali solution
A concentration of 10~40%；2) paint stripper in lye tank (vat) is pumped into the depainting bottom of the barrel with agitating paddle；It will wait for the polyester of depainting
Enameled wire is put into depainting bucket；3) start to stir after overflow, rotating speed is 30~300 turns per minute；The paint film to fall off is with depainting
Agent is overflowed from the overflow launder at the top of depainting bucket, and flows into filter vat；4) paint film and paint stripper to fall off detaches in filter vat, takes off
Paint agent goes successively to lye tank (vat).
Embodiment 1
The sodium hydrate aqueous solution of preparation 30% is as paint stripper in lye tank (vat), and is heated to 90 DEG C.It will be in lye tank (vat)
Paint stripper be quickly pumped into the 1m with anchor formula paddle3In depainting bucket, it is 3m that paint stripper, which is pumped into speed,3/h.It waits starting overflow occur,
Stirring is started, rotating speed is 150 turns per minute.0.5 ton of polyester enamelled wire is put into depainting bucket, is totally immersed into paint stripper, is taken off
Temperature reaches 90 DEG C in paint can, starts timing.By 1 hour, the paint film on enameled wire all fell off, and overflowed to lye de-
In paint removal membrane filtration bucket, the paint film slabbing to fall off is recycled by sock filtration.Obtained copper line surface is bright, and paint stripper can
It recycles, paint removing effect is constant.
Comparative example 1：
The sodium hydrate aqueous solution of preparation 30% is as paint stripper in lye tank (vat), and is heated to 90 DEG C.It will be in lye tank (vat)
Paint stripper be quickly pumped into the 1m with anchor formula paddle3In depainting bucket, it is 3m that paint stripper, which is pumped into speed,3/h.It waits starting overflow occur,
0.5 ton of polyester enamelled wire is put into depainting bucket, is totally immersed into paint stripper, temperature reaches 90 DEG C in depainting bucket, starts timing.
By 1 hour, the paint film on enameled wire did not fall off；By 4 hours, the paint film on enameled wire only had 10% or so to fall off, and
It is overflowed in removing paint film filter vat with lye, the paint film to fall off is tacky, is adhered to filter bag surface；By 12 hours, enameled wire
On paint film there is 80% or so to fall off, and with lye overflow to removing paint film filter vat in, the paint film to fall off is very viscous, shapeless,
It is adhered to filter bag surface, blocks filter bag filter opening, filter bag can not filter, and the copper line surface for the paint film that falls off at this time blacks, and paint stripper is in
Green and viscosity obviously increases, and paint stripper can not recycle.
Comparative example 2：
The sodium hydrate aqueous solution of preparation 2% is as paint stripper in lye tank (vat), and is heated to 90 DEG C.It will be in lye tank (vat)
Paint stripper is quickly pumped into the 1m with anchor formula paddle3In depainting bucket, it is 8m that paint stripper, which is pumped into speed,3/h.It waits starting overflow occur, open
Dynamic stirring, rotating speed are 150 turns per minute.0.5 ton of polyester enamelled wire is put into depainting bucket, is totally immersed into paint stripper, depainting
Temperature reaches 90 DEG C in bucket, starts timing.By 3 hours, the paint film on enameled wire only had 5% or so to fall off, and overflow with lye
It flows in removing paint film filter vat, the paint film slabbing to fall off.By 12 hours, the paint film on enameled wire only had 10% or so to take off
It falls, and is overflowed in removing paint film filter vat with lye, the paint film to fall off is slightly tacky, is adhered to filter bag surface, falls off at this time
The copper line surface of paint film blacks, and paint stripper is in light green color, and paint stripper is still Ke Xunhuanliyong.
Embodiment 2：
The potassium hydroxide aqueous solution of preparation 10% is as paint stripper in lye tank (vat), and is heated to 105 DEG C.It will be in lye tank (vat)
Paint stripper be quickly pumped into the 1m of the oblique paddle of 45 ° of band3In depainting bucket, it is 6m that paint stripper, which is pumped into speed,3/h.It waits starting overflow occur,
Stirring is started, rotating speed is 300 turns per minute.0.5 ton of polyester enamelled wire is put into depainting bucket, is totally immersed into paint stripper, is taken off
Temperature reaches 105 DEG C in paint can, starts timing.By 2.5 hours, the paint film on enameled wire was completely fallen off, and with lye overflow
Into removing paint film filter vat, the paint film slabbing to fall off is recycled by sock filtration.Obtained copper line surface is bright, but copper
There is a small amount of stain on line surface, and paint stripper is Ke Xunhuanliyong, and paint removing effect is constant.
Embodiment 3：
The sodium hydrate aqueous solution of preparation 40% is as paint stripper in lye tank (vat), and is heated to 90 DEG C.It will be in lye tank (vat)
Paint stripper be quickly pumped into the 1m with anchor formula paddle3In depainting bucket, it is 5m that paint stripper, which is pumped into speed,3/h.It waits starting overflow occur,
Stirring is started, rotating speed is 30 turns per minute.0.5 ton of polyester enamelled wire is put into depainting bucket, is totally immersed into paint stripper, depainting
Temperature reaches 90 DEG C in bucket, starts timing.By 0.45 hour, the paint film on enameled wire was completely fallen off, and is overflowed to lye
It removes in paint film filter vat, the paint film slabbing to fall off is recycled by sock filtration.Obtained copper line surface is bright, paint stripper
Ke Xunhuanliyong, paint removing effect is constant.
Embodiment 4：
The sodium hydrate aqueous solution of preparation 30% is as paint stripper in lye tank (vat), and is heated to 40 DEG C.It will be in lye tank (vat)
Paint stripper be quickly pumped into the 1m with anchor formula paddle3In depainting bucket, it is 3m that paint stripper, which is pumped into speed,3/h.It waits starting overflow occur,
Stirring is started, rotating speed is 300 turns per minute.0.5 ton of polyester enamelled wire is put into depainting bucket, is totally immersed into paint stripper, is taken off
Temperature reaches 40 DEG C in paint can, starts timing.By 2 hours, the paint film on enameled wire all fell off, and overflowed to lye de-
In paint removal membrane filtration bucket, the paint film slabbing to fall off is recycled by sock filtration.Obtained copper line surface is bright, and paint stripper can
It recycles, paint removing effect is constant.
Embodiment 5：
30% sodium hydroxide, potassium hydroxide mixed aqueous solution (sodium hydroxide and potassium hydroxide weight are prepared in lye tank (vat)
Amount is than being 1：1) it is used as paint stripper, and is heated to 90 DEG C, it is 5m that paint stripper, which is pumped into speed,3/h.Paint stripper in lye tank (vat) is fast
Speed is pumped into the 1m with anchor formula paddle3In depainting bucket.It waits starting overflow occur, start stirring, rotating speed is 150 turns per minute.By 0.5
Ton polyester enamelled wire is put into depainting bucket, is totally immersed into paint stripper, and temperature reaches 90 DEG C in depainting bucket, starts timing.By
0.4 hour, the paint film on enameled wire all fell off, and was overflowed in removing paint film filter vat with lye, and the paint film to fall off is in blocks
Shape is recycled by sock filtration.Obtained copper line surface is bright, but copper line surface has a small amount of stain, and paint stripper is Ke Xunhuanliyong,
Paint removing effect is constant.
Embodiment 6：
20% sodium hydroxide, potassium hydroxide mixed aqueous solution (sodium hydroxide and potassium hydroxide weight are prepared in lye tank (vat)
Amount is than being 8：2) it is used as paint stripper, and is heated to 95 DEG C.Paint stripper in lye tank (vat) is quickly pumped into the 1m with anchor formula paddle3It is de-
In paint can, it is 5m that paint stripper, which is pumped into speed,3/h.It waits starting overflow occur, start stirring, rotating speed is 100 turns per minute.By 0.5
Ton polyester enamelled wire is put into depainting bucket, is totally immersed into paint stripper, and temperature reaches 95 DEG C in depainting bucket, starts timing.By
0.3 hour, the paint film on enameled wire all fell off, and was overflowed in removing paint film filter vat with lye, and the paint film to fall off is in blocks
Shape is recycled by sock filtration.Obtained copper line surface is bright, and paint stripper is Ke Xunhuanliyong, and paint removing effect is constant.
Embodiment 7：
30% sodium hydroxide, potassium hydroxide mixed aqueous solution (sodium hydroxide and potassium hydroxide weight are prepared in lye tank (vat)
Amount is than being 8：2) it is used as paint stripper, and is heated to 95 DEG C.Paint stripper in lye tank (vat) is quickly pumped into the 1m of the oblique paddle of 45 ° of band3
In depainting bucket, it is 5m that paint stripper, which is pumped into speed,3/h.It waits starting overflow occur, start stirring, rotating speed is 100 turns per minute.It will
0.5 ton of polyester enamelled wire is put into depainting bucket, is totally immersed into paint stripper, and temperature reaches 95 DEG C in depainting bucket, starts timing.Through
Spend 0.25 hour, the paint film on enameled wire all falls off, and is overflowed in removing paint film filter vat with lye, the paint film that falls off at
Sheet is recycled by sock filtration.Obtained copper line surface is bright, and paint stripper is Ke Xunhuanliyong, and paint removing effect is constant.
The present invention can be summarized with others without prejudice to the concrete form of the spirit or central characteristics of the present invention.Therefore, nothing
By from the point of view of which point, above-mentioned experimental program of the invention can only all be considered the description of the invention and cannot limit this hair
Bright, claim indicates the scope of the present invention, and above-mentioned explanation does not point out the scope of the present invention, therefore, with this hair
Any variation in the comparable meaning and scope of bright claims is all considered as being included in the range of claims
It is interior.
Claims (4)
1. a kind of polyester enamelled wire paint removing process, which is characterized in that include the following steps：
1) paint stripper is added in lye tank (vat), and is heated to the paint film treatment temperature of polyester enamelled wire；The paint stripper is
Sodium hydroxide and potassium hydroxide inorganic alkali solution, the wherein mass ratio of sodium hydroxide and potassium hydroxide are 7.5~8.5：2；It is described
Inorganic alkali solution mass concentration be 10~40%；
2) paint stripper in lye tank (vat) is pumped into the depainting bottom of the barrel with agitating paddle；It is de- will to wait for that the polyester enamelled wire of depainting is put into
In paint can；The speed that is pumped into of the paint stripper is replaced 2~10 times for whole paint strippers in depainting bucket per hour；
3) start to stir after overflow, rotating speed is 30~300 turns per minute；The paint film to fall off is as paint stripper is at the top of depainting bucket
Overflow launder overflows, and flows into filter vat；
4) paint film and paint stripper to fall off detaches in filter vat, and paint stripper goes successively to lye tank (vat).
2. polyester enamelled wire paint removing process according to claim 1, which is characterized in that the paint film treatment temperature is 40
~105 DEG C.
3. polyester enamelled wire paint removing process according to claim 1, which is characterized in that the agitating paddle is 45 ° of oblique paddles
Or anchor formula paddle.
4. polyester enamelled wire paint removing process according to claim 1, which is characterized in that the paint stripper is sodium hydroxide
With potassium hydroxide inorganic alkali solution, the wherein mass ratio of sodium hydroxide and potassium hydroxide is 8：2；The matter of the inorganic alkali solution
Measure a concentration of 28~32%；The paint film treatment temperature is 90~100 DEG C；In the step 3) rotating speed be per minute 80~
120 turns；The speed that is pumped into of paint stripper is replaced 4~6 times for whole paint strippers in depainting bucket per hour in the step 2)；Institute
The agitating paddle stated is 45 ° of oblique paddles.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610162395.4A CN105670375B (en) | 2016-03-22 | 2016-03-22 | A kind of polyester enamelled wire paint removing process and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610162395.4A CN105670375B (en) | 2016-03-22 | 2016-03-22 | A kind of polyester enamelled wire paint removing process and device |
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| CN105670375B true CN105670375B (en) | 2018-09-11 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107987603A (en) * | 2017-10-31 | 2018-05-04 | 宁波金田铜业(集团)股份有限公司 | A kind of useless electromagnetic wire paint removing process and device |
| CN109233427B (en) * | 2018-09-13 | 2023-05-09 | 无锡市恒利弘实业有限公司 | Stripping method of UV ink on surface of metal substrate |
| CN109332289A (en) * | 2018-10-29 | 2019-02-15 | 广东新昇电业科技股份有限公司 | A kind of metal wire automatic painting stripping device and its stripping method |
| CN109504158A (en) * | 2018-12-11 | 2019-03-22 | 沈阳理工大学 | A kind of paint stripper and preparation method thereof and bucket paint removing device |
| CN111029887B (en) * | 2019-12-19 | 2021-12-07 | 北京航天控制仪器研究所 | Device and method for stripping polyimide copper-clad wire coating layer |
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| WO2010131539A1 (en) * | 2009-05-13 | 2010-11-18 | 国立大学法人岡山大学 | Coating film remover and method for removing coating film using same |
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| CN105670375A (en) | 2016-06-15 |
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