An article to help you understand hydrophilic aluminum foil — published by Huawei Factory
1. Definition of hydrophilic foil
What is Hydrophilic Foil? Different from ordinary light foil, hydrophilic foil, as the name suggests, is to treat aluminum foil with hydrophilicity, and through a special process, a layer of hydrophilic layer is coated on its surface.
2. The color of the hydrophilic foil
Common colors are blue, gold, black, and aluminum.
3. Application of hydrophilic foil
What are the uses of hydrophilic foil? Hydrophilic foils are usually used in heat exchangers of refrigeration equipment such as household air conditioners, refrigerators, and automotive air conditioners.
If the aluminum foil is directly used in the fins of the air conditioner, the alternating dry and wet working environment will cause it to be corroded and produce “white rust”, which will cause mold to grow in the heat exchanger, and cause environmental pollution as the cold air is sent into the room.
The hydrophilic layer not only improves the corrosion resistance of the aluminum foil, but also makes it easy for the moisture in the hot air to condense on the heat exchange fins to spread out and flow down the sheet, thus avoiding damage caused by the gap between the heat exchange fins. The water droplets “bridge” to affect the ventilation effect of the heat exchanger, thereby increasing the heat exchange rate by 5%.
4. Six advantages of hydrophilic foil
3) It can improve the corrosion resistance and weather resistance of the heat exchanger and prolong the service life of the heat exchanger
4) Due to the absence of water droplets, the noise generated by the vibration of the air conditioner can be reduced accordingly
5) Dust removal
6) No smell
5. Common alloy state of hydrophilic foil
At present, there are many 8011 alloys on the market, and a small number of customers will ask for 1-series and 3-series aluminum foils, such as 1100 aluminum foil and 3102 aluminum foil, and 8011 aluminum foil is more common.
Temper: O state or H22, these two states are relatively common, a small number of customers require 8011 H24 or H26, and provide according to customer requirements.
6. Common specifications of hydrophilic foil
Common thickness: 0.095, 0.12, 0.13, 0.18MM, etc.
Common width: 277, 286, 470, 774, 835MM, etc.
7. Hydrophilic foil structure
Hydrophilic coating + corrosion-resistant coating + aluminum foil + corrosion-resistant coating + hydrophilic coating
8. Classification of hydrophilic coating
Generally, a simple distinction can be made between inorganic coatings and organic coatings
Organic coatings can be divided into: general organic coatings, high corrosion-resistant organic coatings, antibacterial organic coatings and high corrosion-resistant antibacterial coatings.
Inorganic coating material: water glass or silica
Organic coating material: hydrophilic resin
9. Different coating characteristics of hydrophilic foil
Organic coating: The hydrophilicity of the coating film is relatively poor, but the formability, corrosion resistance and odorlessness of the coating film are excellent, and the price is relatively high.
Inorganic coating: The hydrophilicity of the coating film is relatively good, but the corrosion resistance and odorlessness are poor, and the price is relatively cheap.
At present, organic coatings are widely used in the market, and all of them have antibacterial function.
10. Performance requirements of hydrophilic foil
Usually the indicators for testing hydrophilic foil are as follows:
Substrate quality (according to YS/T95.1), special standard for air-conditioning foil.
Chemical composition (according to GB/T3190)
Mechanical properties (according to 3.3 and 3.4 in YS/T95.1)
Coating properties (according to YS/T95.1)
Appearance quality (according to 3.6 in YS/T95.1)
11. Introduction to the properties of hydrophilic foil coating
1) General organic coating requirements:
|1||Film weight||1.0～1.5g/m2 (average on one side)|
|2||initial hydrophilic angle
Persistent hydrophilic angle
|Initial hydrophilic angle≤10°
Persistent hydrophilic angle≤30°
|3||Adhesion||Cupping test (indentation depth: 5mm): no peeling
Cross-cut test (cross-cut interval 1mm): 0 grade
|4||Corrosion resistance||Neutral salt spray test (500h) R.NO.≥9.5|
|5||Alkali resistance||Sample coating without white or black spots|
|6||Solvent resistance||Sample weight loss ≤ 1%|
|7||heat resistance||At a temperature of 200 ° C, keep for 5 minutes, the color does not change;
At a temperature of 300°C, keep it for 5 minutes, the coating film is slightly yellow
|8||oil resistance||Soak in no-cleaning oil for 24 hours: the coating does not bubble
Hydrophilic angle ≤ 20° after oil-resistant process
|10||wear on mold||Same as regular aluminum foil|
|11||Resistant to neutral detergent||Coating does not blister|
|12||Solvent Wipe Resistant||≥30 times|
2) High corrosion resistance organic coating:
12. What should be paid attention to when purchasing hydrophilic aluminum foil?
3. Corrosion resistance
4. Alkali resistance
5. Coating smell
6. Antibacterial properties
As a professional aluminum foil manufacturer, Huawei can help you understand hydrophilic aluminum foil more completely.