Today, Huawei editor wants to share with you what is hydrophilic aluminum foil. Many people will have questions, I know aluminum foil, but what is hydrophilic aluminum foil?
This article will be easy to understand and introduce what is hydrophilic aluminum foil.
First and most important point: what is the difference between aluminum foil and hydrophilic aluminum foil?
Hydrophilic aluminum foil is often used in refrigeration equipment. Compared with ordinary aluminum foil, the magic of hydrophilic aluminum foil is that it has undergone surface treatment and added a coating—more hydrophilic layers.
What is the function of the hydrophilic layer?
The hydrophilic layer can make the water droplets condensed by the water in the hot air on the heat exchange fins to spread easily, so as to flow down the sheet, so as to avoid the "bridge" of the water droplets between the heat exchange fins and affect the aluminum material. The ventilation effect of the equipment can increase the heat exchange rate by 5% and greatly improve the conversion rate.
What are the advantages of hydrophilic aluminum foil?
1. Extend the life of aluminum products
2. Anticorrosion and dust removal
3. Anti-mildew, no peculiar smell
4. Improve the durability of aluminum products
Preparation method of hydrophilic aluminum foil
There are mainly single-coating and single-baking methods and double-coating and double-baking methods. The commonly used single-coating and single-baking methods are to decrease the aluminum foil, then chemically oxidize it to form a chemical conversion film on the surface of the aluminum foil, and finally apply a hydrophilic coating. The method has a simple process and low cost.
The production process of hydrophilic aluminum foil:
Unwinding → pretreatment → surface roll coating (first roll coating → first drying → second roll coating → second drying) → coiling
The function of pretreatment: mainly to enhance the bonding force between the coating and the aluminum foil.
The function of the coating: the coating plays the role of increasing the hydrophilicity and corrosion resistance of the product.
For products with higher performance requirements, if the primary coating fails to meet the due indicators, a secondary coating is required. Generally speaking, a single-coat product has both a hydrophilic function and a corrosion-resistant function in one coating. For double-coated products, the first coating plays a role in corrosion resistance, and the second coating plays a hydrophilic role.