Special hydrophobic coating for aluminum strip

Abstract

A special hydrophobic coating for an aluminum strip is a coating coated on a metal plate. The special hydrophobic coating is produced by adopting a routine production technology of coatings, and is characterized in that the special hydrophobic coating comprises 25-35wt% of a water-soluble acrylic resin, 5-15wt% of amino resin for coatings, 1-4wt% of water-soluble epoxy resin, 0.5-2.0wt% of water-soluble silicone oil, 0.5-1.5wt% of dimethyl ethanolamine, 0.5-1.5wt% of ethylene glycol monobutylether, 0.1-0.4wt% of dinonylnaphthalenedisulphonic acid, 0.3-0.8wt% of NP-40 polyoxyethylene nonyl phenyl ether, and the balance purified water. The surface of the aluminum strip is coated with the coating obtained in the invention through a roller coating technology to form the hydrophobic aluminum strip, and use and examination results show that compared with common aluminum strips in the prior art, the coated aluminum strip obtained in the invention has a good hydrophobic function, the contact angle of water drops on the surface of the aluminum strip is 155-165DEG, and the water drops do not adhere with each other, and highly likely tumble; and the hydrophobic aluminum strip can be used in a refrigeration system in order to improve the heat exchange effect, reduce energy consumption and prolong the service life.

Description

technical field [0001] The invention belongs to coatings coated on metal plates, in particular to a special water-repellent coating for aluminum strips. Background technique [0002] Hydrophobicity, also known as hydrophobicity, is a property that a material cannot be wetted by water when it comes into contact with water in the air. The reason is that when the cohesive force between material molecules and water molecules is smaller than the cohesive force between water molecules, the water molecules cannot spread out on the surface of the material, and can only roll on the surface of the material in a spherical shape, just like water droplets rolling on the lotus leaf , so it is commonly known as the lotus leaf effect. At this time, at the intersection of the material, water and air, the inner angle formed by the tangent along the surface of the water drop and the surface of the material, that is, the contact angle θ>90°, the material is hydrophobic; on the contrary, the...

AI Technical Summary

Problems solved by technology

[0003] When ordinary aluminum materials without hydrophobicity or hydrophilic aluminum materials are used in a refrigeration environment, when the surface temperature is lower than the dew point of the ambient air, the moisture in the ambient air will condense into water droplets, which not only reduces the heat exchange of the refrigeration system effect, thereby increasing energy consumption, and at the same time increasing the chance of corrosion on the aluminum surface and shortening the service life

Especially when the air conditioner performs heating work in a sub-zero outdoor air environment, the heat exchange components of the outdoor body are responsible for converting the outdoor heat and sending it into the room. The water droplets condensed on the surface of the heat exchange components will inevitably It freezes into frost and adheres to the surface. On the one hand, it causes the heat exchange effect to decrease sharply. On the other hand, in order to ensure the continuous operation, the air conditioner has to temporarily stop the heating operation, start the defrosting program, and perform the cooling operation in the opposite direction, so that the outdoor body Heat is generated in the heat exchange parts to remove the frost condensed on the surface of the heat exchange parts of the outdoor body, which results in a waste of energy for defrosting, and the heating effect of the air conditioner is low when the air conditioner operates in a sub-zero outdoor air environment.