CN102368027A - Flat aluminium cooling tube with film - Google Patents
Flat aluminium cooling tube with film Download PDFInfo
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- CN102368027A CN102368027A CN2011101759928A CN201110175992A CN102368027A CN 102368027 A CN102368027 A CN 102368027A CN 2011101759928 A CN2011101759928 A CN 2011101759928A CN 201110175992 A CN201110175992 A CN 201110175992A CN 102368027 A CN102368027 A CN 102368027A
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- flat tube
- cooling flat
- aluminium
- film
- aluminium cooling
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- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Paints Or Removers (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention relates to a flat aluminium cooling tube with a film. The flat aluminium cooling tube is characterized in that: coating composite is coated on an aluminium or aluminium substrate surface of the flat aluminium cooling tube to form the film, and the coating composite is provided with titanium dioxide, L-ascorbic acid, trifluoro-resin, alcohol and water. The flat aluminium cooling tube with the film can guarantee sufficient hydrophily and corrosion resistance.
Description
Technical field
The present invention relates to a kind of cooling flat tube material that forms the aluminum or aluminum alloy of the outstanding organic film of hydrophily from the teeth outwards, but for example relate to for for the cooling flat tube material of heat exchanger etc., being the preferred long term maintenance dew aluminum cooling flat tube material of wetting surface texture easily.
Background technology
The heat exchanger outstanding aluminiums such as heat conductivity, machinability, corrosion resistance that are widely used in order to carry out heat exchange effectively, in addition, also in order to make space compact (compact), adopt with the narrow interval and the structure of establishing aluminum cooling flat tube spare.Therefore, when the running of air conditioner, if the temperature of cooling flat tube material surface reaches below the dew point of air, the dew that then is attached on the cooling flat tube material surface condenses, and makes between the adjacent cooling flat tube inaccessible sometimes.At this moment, if the hydrophily of aluminum cooling flat tube material surface is low,,, thereby make the further variation of blocked state of cooling flat tube so that the dew that adheres to becomes is hemispherical then owing to become big with the contact angle of water.As a result, hot-swap feature receives known in the past problems such as the dew that hinders or cause owing to blast disperses outside air conditioner.
In order to improve the problem of above-mentioned dew, developed through surface and carried out hydrophilicity-imparting treatment aluminium sheet self, so that when being processed into the cooling flat tube material and using, dew can not stop on the cooling flat tube surface and the technology that is removed easily, discharges.For example, disclose in the prior art and with the technology of synthetic silica and water paint.But if use synthetic silica, so add man-hour in the shaping of cooling flat tube material, there is the problem of the serious wear of instrument or metal mold etc. in the hardening of filming that then obtains.In addition, also have the distinctive cement of silica flavor or dust flavor, these stinks are considered to can bring unplessantness displeasure to human body owing to be adsorbed on that dispersing of material or silicon dioxide microparticle on the silica cause.Therefore, for example, the high-hydrophilic coating that uses the alumina sol replacement of silicon dioxide is disclosed in the prior art.In this technology, compare with the situation of using silica, although alleviate to some extent, still can observe stink, and if long-term the use, then stink increases, so still insufficient on this point that suppresses stink.
On the other hand; To disclose in the prior art that dew on the cooling flat tube material surface is long-time is detained and brings out hydration reaction or corrosion reaction in order suppressing to be attached to, to have used with the salt of carboxymethyl cellulose and N hydroxymethyl acrylamide technology as the surface conditioning agent of main component.In addition, disclose in the prior art in order to give corrosion resistance and hydrophily to the cooling flat tube material, using with polyvinyl alcohol and polyvinylpyrrolidone is effective as the surface conditioning agent of main component.At these in the past in the technology, owing to do not use silica etc., so can not cause the problem of wearing and tearing that stink or metal mold take place and so on.
In addition, the applicant continues the heat exchanger of the hydrophilic resin tunicle that is formed with organic system is inquired into aluminum cooling flat tube material.Formation is the method for the organic system resin coating layer of main component with polyvinyl alcohol and water-soluble nylon, water-soluble phenol etc., polyacrylic acid, polyethylene glycol etc.Unpleasant foul smell can not take place and keep hydrophily in these resin coating layer.
The processability of the hydrophilic tunicle of these organic system resin coating layer is outstanding and do not have a problem such as tool wear; In addition; The foul smell that does not also have silica to cause takes place, even but such serious unlike inorganic system, but the undeniable generation that has the slight foul smell in organic system resin source.
The organic system resin coating layer is utilized the coating that application contains the constituent of resin coating layer on aluminium sheet such as glue spreader usually in the formation on the aluminium sheet, carry out heat drying then and implement.Then, the hydrophily aluminium aluminium cooling flat tube that produces becomes heat exchanger through operation such as pressurization processing or copper pipe insertion, expander, soldering.Think in these a series of manufacturing processes, thus when resin coating layer forms or heat exchanger when making added heat can cause that the part generation thermal decomposition deterioration of resin coating layer produces foul smell.
Summary of the invention
The objective of the invention is to, a kind of aluminium cooling flat tube material that stops inorganic system to apply reliably is provided, and this cooling flat tube material can guarantee sufficient hydrophily, corrosion resistance.
For this reason, the invention provides a kind of can use for a long time also can protracted hydrophilicity or the aluminium cooling flat tube material with resin film of corrosion resistance.Technical scheme of the present invention is following:
A kind of aluminium cooling flat tube with film is characterized in that the aluminium cooling flat tube has application composition and forms film by on aluminium or aluminium substrate surface, being coated with, and this application composition has titanium dioxide, L-ascorbic acid, three fluororesin, alcohol and water.
Wherein, the content of titanium dioxide is 4.8-25 wt%; Preferably, the content of titanium dioxide is 7.5-22.5 wt%; More preferably, the content of titanium dioxide is 12.5-20 wt%.
Wherein, the L-content of ascorbic acid is 2.7-22.5 wt%; Preferably, the L-content of ascorbic acid is 4.5-20.5 wt%; More preferably, the L-content of ascorbic acid is 7.5-18 wt%.
Wherein, described three fluororesin are CTFE/vinyl ether copolymers.Preferably, the content of three fluororesin is 0.8-5.5 wt%; More preferably, the content of three fluororesin is 1.2-4.5 wt%.
Wherein, described alcohol can be selected from isopropyl alcohol, diethylene glycol (DEG), DPG, polyethylene glycol, 1,2-propane diols, 1,3-butanediol, 1, one or more of 4-butanediol, glycerine.And preferably, the content of described alcohol is 5.0-18.5 wt%; Preferably, the content of described alcohol is 7.5-15.5 wt%; More preferably, the content of described alcohol is 9.0-13.5wt%.
Wherein, the thickness of described film is preferably 0.2-2.0 μ m; Preferably, its content is 0.5-1.5 μ m; At thickness is under the situation below the lower limit, and hydrophily descends, and is being under the situation more than the higher limit, and heat exchange efficiency descends.
Aluminum was the high material of corrosion resistance originally, but the aluminium cooling flat tube is under the moistening atmosphere owing to the existence of dew, so be exposed in the environment of easy generation corrosion.Can know in that any corrosion resistance layer is not set only to apply under the situation of hydrophilic resin layer that corrosion is carried out in the aluminium under this hydrophilic resin layer easily, therefore cause the performance of film to reduce.Thereby, be added with titanium dioxide and three fluororesin among the present invention as corrosion-resistant component.
L-ascorbic acid in the application composition of the present invention has water-soluble or certain hydrophily, so if on alumina-base material, adhere to the film that cooperation contains the L-ascorbic acid, then the hydrophily of this film can variation.Therefore; The condensate that takes place in the running of heat exchanger can adapt to the hydrophily on aluminium cooling flat tube surface well and flow easily; Thereby quicken the discharge of condensate, cooling flat tube can not block because of being condensed, thereby can stop the variation of heat exchange efficiency effectively.
When embodiment of the present invention, unqualified to the formation method of film, for example as long as form above-mentioned application composition, known method such as heat after coating it on aluminium sheet then and apply and form film.In addition, when embodiment of the present invention, also unqualified to coating process.
In addition; Also can be in the scope that does not hinder performance of the present invention; In being used to form the composition of film, add the various coating additives that are used to improve coating or operability etc., for example at random appropriate table surface-active agent, Surface Machining agent, crosslinking agent, defoamer, levelling agent, antiseptic, other mould resistants etc. get final product.
In addition,, before coated thin film, also can implement phosphate and/or chromate surface treatment or carry out the differential arc oxidation processing in order further to improve corrosion resistance aluminium.
The specific embodiment
Utilize existing manufacturing approach in the prior art, make the aluminium matrix of JISAA-1000.Use alkaline rinse at first this aluminium to be carried out oil removing, carry out differential arc oxidation then and handle.
The aluminium that will pass through after the above-mentioned processing is used material as test, utilizes prior art to be processed into the aluminium cooling flat tube.Then, through applying application composition of the present invention, that is: according to the ratio of table 1 record, be coated on the inner surface of aluminium cooling flat tube, coating thickness is 0.5 mm, and the heat treated temperature is 160 ℃, forms described aluminium cooling flat tube with film.
Each aluminium cooling flat tube material to preparing carries out the test of following various performances.
The hydrophily test
At flow is 8 hours aluminium cooling flat tube materials of dipping in the running water of 1 L/min, then 80 ℃ dry 16 hours down, these operations as 1 circulation (cycle), are carried out 5 circulations.Then, the water droplet of about 0.5 microlitre of drippage (microliter) on the inner surface of aluminium cooling flat tube material uses the contact angle determination device to measure contact angle.
Then, carry out hydrophily evaluation according to following standard based on the aluminium cooling flat tube material of these measurement of contact angle values.
Outstanding: contact angle is less than 20 °
Well: contact angle is 20 ° to 40 ° (comprise 20 °, but do not comprise 40 °)
Qualified: contact angle is 40 ° to 60 ° (comprise 40 °, but do not comprise 60 °)
Bad: contact angle is more than 60 °.
Corrosion resistance is estimated
Each aluminium cooling flat tube material to trial-production is implemented neutral salt spray test (GB 6458-86), and be 720 h experimental period.After carrying out these tests, the outward appearance of each test piece of visualization, the long-pending ratio of all surfaces of the relative aluminium cooling flat tube of the area material of counting corrosion part according to criterion, is estimated the extent of corrosion of aluminium cooling flat tube material.
Well: the ratio of corroded area is less than 10%;
Qualified:The ratio of corroded area is 10%-30% (not comprising 30%);
Bad: the ratio of corroded area is more than 30%.
The constituent content of table 1 application composition (wt%), wherein surplus is a water.
| Experiment numbers | Titanium dioxide | The L-ascorbic acid | Three fluororesin | Diethylene glycol (DEG) |
| 1 | 4.8 | 2.7 | 0.8 | 5.0 |
| 2 | 7.2 | 5.8 | 1.5 | 7.5 |
| 3 | 10.8 | 7.5 | 2.4 | 9.5 |
| 4 | 13.5 | 10.5 | 3.2 | 11.5 |
| 5 | 15.8 | 13.5 | 3.8 | 13.5 |
| 6 | 18.5 | 15.5 | 4.5 | 15.0 |
| 7 | 21.8 | 18 | 5.0 | 16.8 |
| 8 | 25 | 22.5 | 5.5 | 18.5 |
Table 2The test evaluation result
| Experiment numbers | Hydrophily | Corrosion resistance |
| 1 | Well | Well |
| 2 | Well | Well |
| 3 | Outstanding | Well |
| 4 | Outstanding | Well |
| 5 | Outstanding | Well |
| 6 | Outstanding | Well |
| 7 | Outstanding | Well |
| 8 | Outstanding | Well |
Claims (7)
1. aluminium cooling flat tube with film is characterized in that the aluminium cooling flat tube has application composition and forms film by on aluminium or aluminium substrate surface, being coated with, and this application composition has titanium dioxide, L-ascorbic acid, three fluororesin, alcohol and water.
2. the described aluminium cooling flat tube of claim 1, the content that it is characterized in that described titanium dioxide is 4.8-25 wt%.
3. the described aluminium cooling flat tube of claim 1 is characterized in that described L-content of ascorbic acid is 2.7-22.5 wt%.
4. the described aluminium cooling flat tube of claim 1 is characterized in that described three fluororesin are CTFE/vinyl ether copolymers.
5. the described aluminium cooling flat tube of claim 1 is characterized in that described alcohol is selected from isopropyl alcohol, diethylene glycol (DEG), DPG, polyethylene glycol, 1,2-propane diols, 1,3-butanediol, 1, one or more of 4-butanediol, glycerine.
6. the described aluminium cooling flat tube of claim 5, the content that it is characterized in that described alcohol is 5.0-18.5 wt%.
7. the described aluminium cooling flat tube of claim 1, the thickness that it is characterized in that described film is 0.2-2.0 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101759928A CN102368027A (en) | 2011-06-28 | 2011-06-28 | Flat aluminium cooling tube with film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101759928A CN102368027A (en) | 2011-06-28 | 2011-06-28 | Flat aluminium cooling tube with film |
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| Publication Number | Publication Date |
|---|---|
| CN102368027A true CN102368027A (en) | 2012-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101759928A Pending CN102368027A (en) | 2011-06-28 | 2011-06-28 | Flat aluminium cooling tube with film |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727832A (en) * | 2013-12-09 | 2014-04-16 | 广东万和新电气股份有限公司 | Aluminum heat exchanger pipeline of which inner wall is provided with anticorrosive coating and processing method of aluminum heat exchanger pipeline |
| WO2019008013A1 (en) | 2017-07-04 | 2019-01-10 | Szczepaniak Stanislaw | Water-soluble gold (iii) complexes, methods of producing water-soluble gold (iii) complexes and their use |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101056951A (en) * | 2004-11-05 | 2007-10-17 | 巴斯福股份公司 | Coating materials |
| CN101208397A (en) * | 2005-06-24 | 2008-06-25 | 三菱化学株式会社 | Coating composition and its manufacturing method, and resin molding and its manufacturing method |
| WO2009119689A1 (en) * | 2008-03-25 | 2009-10-01 | 富士フイルム株式会社 | Hydrophilic member, fin member, aluminum fin member, heat exchanger and air conditioner |
-
2011
- 2011-06-28 CN CN2011101759928A patent/CN102368027A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101056951A (en) * | 2004-11-05 | 2007-10-17 | 巴斯福股份公司 | Coating materials |
| CN101208397A (en) * | 2005-06-24 | 2008-06-25 | 三菱化学株式会社 | Coating composition and its manufacturing method, and resin molding and its manufacturing method |
| WO2009119689A1 (en) * | 2008-03-25 | 2009-10-01 | 富士フイルム株式会社 | Hydrophilic member, fin member, aluminum fin member, heat exchanger and air conditioner |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727832A (en) * | 2013-12-09 | 2014-04-16 | 广东万和新电气股份有限公司 | Aluminum heat exchanger pipeline of which inner wall is provided with anticorrosive coating and processing method of aluminum heat exchanger pipeline |
| WO2019008013A1 (en) | 2017-07-04 | 2019-01-10 | Szczepaniak Stanislaw | Water-soluble gold (iii) complexes, methods of producing water-soluble gold (iii) complexes and their use |
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Application publication date: 20120307 |