Hydrophilic surface treatment aluminum sheet and radiator fin for heat exchanger using the aluminum sheet

Abstract

The present invention provided a hydrophilic surface-treated fin member for a heat exchanger capable of realizing delayed elution of water-soluble polymer compound when aqueous press oil is used, and maintaining excellent hydrophilicity on the surface of the fin member for a long period of time. The hydrophilic surface-treated fin member 1 for the heat exchanger has at least one of a corrosion-resistant film 3 and a hydrophilic film 4 at least on one side of aluminum plate 2 or an aluminum alloy plate, and also has a lubricating film 5 of delayed elution formed by adding organic cross-linking agent on water-soluble poly-ether-polyol compound. The friction coefficient when pure water is coated on the lubricating film 5 with delayed elution is <=0.15, and the water droplet contact angle [theta] generated when dropping a water droplet on the lubricating film 5 with delayed elution is <=30[deg.].

Description

technical field [0001] The present invention relates to a hydrophilic surface-treated aluminum plate, and more particularly, to an aluminum plate that is subjected to a hydrophilic surface treatment and can be formed using water or a water-soluble cutting fluid. The aluminum plate of the present invention is suitable as a material for fins for heat exchangers. Background technique [0002] Generally, heat exchangers designed for controlling temperature and humidity are widely used in various types of air conditioners or radiators for buildings or vehicles. Most of fins used as parts of these heat exchangers are made of aluminum or aluminum alloy plates (hereinafter simply referred to as "aluminum plates") in consideration of weight reduction, thermal conductivity, formability, and cycle characteristics. [0003] When an air conditioner or a radiator using such a heat exchanger is operated, it generally occurs that condensed water adheres to fins of the heat exchanger. Then...

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Problems solved by technology

[0007] However, when roasting is performed as a degreasing process after the molding process using hydrocarbon-based volatile molding oil, the volatile oil is vaporized in the air, disadvantageously causing deterioration of the working environment

Also, this leads to the production of carbon dioxide which can cause global warming and thus is not good for the environment

Degreasing with organic solvents such as trichlorethylene is not currently used because trichlorethylene itself is a harmful substance that causes environmental pollution and damages the health of workers

[0008] Although it is preferable to use water or water-soluble cutting fluid (hereinafter collectively referred to as "water-soluble cutting fluid") to carry out the molding process to solve the above-mentioned problems, however, the solution-type water-soluble cutting fluid, which may generally be hydrophilic No influence on properties, lack of lubricity, thus disadvantageously making it difficult to ensure sufficient formability

[0009] The molding process of conventional heat sink materials with hydrophilic films using water-soluble cutting fluids results in: the elution of water-soluble components of the outermost lubricious or hydrophilic films, and / or the inclusion of hydrophilic treatments in the films Eluted with composition, into the cutting fluid, resulting in a reduction in the hydrophilic character or lubricity of the hydrophilic film

In addition, the decrease in lubricity unfavorably deteriorates the formability of the heat sink material

In some cases, the eluting components of the lubricating and hydrophilic films, and / or the eluting composition for the hydrophilic treatment, redeposit on the heat sink material, resulting in non-uniform appearance

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