JPS6082169A - Surface treatment - Google Patents

Abstract

PURPOSE:To provide hydrophilicity and corrosion resistance to the surface of a material to be treated by preparing plural plastics which exhibit water solubility to water resistance according to the degree of polymn. or the degree of reaction with other materials and coating successively the plastics on the surface of said material. CONSTITUTION:Plastics such as polyvinyl acetal, etc. which have different degrees of reaction or polymn. are preliminarily prepared and these plastics are successively coated on a material to be treated in the stage of subjecting said material to a surface treatment to provide both hydrophilicity and water resistance to the surface of said material. The surface has water resistance and hydrophilicity if the same kind of the plastics are coated superposedly in the above-mentioned way and therefore said surface has good wettability with water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface treatment method for imparting both hydrophilicity and pore-opening properties to the surface of an object to be treated.

Air conditioners such as room coolers and car coolers.

A/ alloys are widely used to make them lighter and more compact.
The so-called ``fuki skip'') may occur, resulting in tumbles. As a countermeasure to this, it is effective to improve the water wettability of the evaporator surface. A method of making the material porous by alumite or the like is generally employed.

The current usage is summarized in Table 5 below.

All of them are inferior in adhesion and long-term durability, and the hydrophilic surface treatment not only has no anticorrosion effect but also promotes single-island corrosion due to its hydrophilic nature.A/Alloy 91
Aru's white flour (white zabinoku 1'I imitates raw (it has some drawbacks).

The purpose of this invention is to thermally treat the surface of objects to be treated with both hydrophilicity and corrosion resistance. That is, in the present invention, a plurality of synthetic resins exhibiting water-bathability or aqueous properties depending on the degree of polymerization or the degree of reaction with other substances are prepared in advance by changing the degree of reaction with other substances. This is based on the fact that a surface-treated JIJi layer having both hydrophilicity and water resistance (corrosion resistance) can be obtained by sequential coating treatment.

In the surface treatment that imparts hydrophilicity and corrosion resistance to G-processed materials, the present invention uses reactions such as polyvinyl acetal (e.g., in the case of polyvinyl acetal, reactions between polyvinyl alcohol and formalin: formalization, etc.). Synthetic resins with different degrees of polymerization or degrees of polymerization are prepared in advance, and these synthetic resins are sequentially coated to obtain a surface treatment layer having hydrophilicity and water resistance.It has the following features.

(17) The coating layer in contact with the object to be treated has water resistance (hydrophobicity) and prevents the intrusion of erodible substances such as moisture and salt.

(2) Since the outermost surface of the surface treatment layer has hydrophilicity, it has good water wettability and prevents problems such as splashing of the water bottle.

(3) These coating layers are made of the same type of synthetic resin, and between the water-viewing layer and the hydrophobic layer, there is an intermediate property between hydrophilic and hydrophobic, which has a different degree of polymerization or degree of reaction with other substances. Since it is a kind of continuous layer, coating/14
1? lif power is very good.

(4) Since the coating material is a synthetic resin of the same type, quality control of the coating material is easy, unlike multilayer coatings using different materials.

(5) Hydrophilicity and hydrophobicity Since the layers can be formed freely, a surface treatment layer with properties suitable for the purpose of use can be easily obtained.

Note that in the present invention, in addition to the above-mentioned polyvinyl acetal, phenol aldehyde resin is used.

Etherified melamine resins, polyvinyl alcohol, amine-neutralized alkyd resins, etc. can also be used.

Table 1 shows the basic processing method and processing conditions of the present invention.

Five examples of the present invention are shown below.

Na2(X)
After washing with an alkaline aqueous solution adjusted to pH 10 to 11 for 5 to 10 minutes depending on the degree of contamination and ash, the mixture was washed with steam using chlorocene. Cleaned vaporizer formal (L
The sample was immersed in a cyclohexane solution containing 20% polyvinyl formal of 60% LIL for 5 minutes while applying ultrasonic vibration so that each part of the vaporizer was sufficiently contacted with the liquid.

Next, the vaporized positive vinyl formal was taken out of the cyclohexane bath and rotated on a rotating table to drain the liquid. The vaporizer used for cutting was heated in an electric furnace at 80 to 100 C for 50 minutes. You, take out the vaporizer from the electric furnace, put it in the release device, and the degree of formalization is 40.
A dioxane solution containing 20% of polyvinyl formal was immersed in a dioxane solution for 5 minutes while applying ultrasonic vibration.

Table 1 Surface treatment method for imparting water wettability and corrosion resistance (example of treatment conditions) Button, *2. As the synthetic resins of i[5, resins having a single polymer or different degrees of reaction with other substances are used.

Next, the above liquid draining and heating operations using an electric furnace were repeated. (The vaporizer was buried deep inside.)

Take it out from the electric furnace, let it cool, and then put it in a water solution containing 20% polyvinyl formal for 5 minutes.
It was soaked for 1 i while applying ultrasonic vibration. After draining the liquid, the vaporizer was heated in a sleep furnace at 80-100C% for 1 hour.

The structure of the coating layer obtained in this manner is shown in Figure 1. In the figure, 1 is the base material Al alloy, and the relationship between the degree of compression, hydrophilicity, and corrosion resistance of each layer 2 to 4 is shown in Figure 1. It is shown in Table 2.

Table 2 2 Large None Large 3 Medium Medium Medium 4 Small Large The surface of the layer treated by Komoto Aemon has a low degree of formalization, so it is considered hydrophilic and the water wettability is evaluated as shown in Figure 2. The contact angle measurement test results also show that compared to conventional surface treatment methods of this type (e.g., water glass), as shown in Table 6, it has superior water wettability in terms of initial value and durability. Confirmed. In addition, as shown in Table 4, its corrosion resistance was compared to anodizing treatment and zinc-chromic acid-based chemical rupture treatment in a 1000-hour salt spray test and a real environment simulation test.

It showed immediate corrosion resistance.

Inferior

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the structure of coating h☆ obtained by the present invention, and Fig. 2 shows a comparison of the contact angle measurement results in water l between the treatment method of j that emits one ray and the conventional treatment method. This is what is shown. Sub-Agents 1) Meifuku Agent Ryo Hagiwara - Figure 1

Claims (1)

[Claims] In a surface treatment method that imparts hydrophilicity and corrosion resistance to the surface of a workpiece, a synthetic resin that exhibits water bathability to water resistance is changed in advance by changing the degree of polymerization or the degree of reaction with other substances depending on the degree of polymerization or the degree of reaction with other substances. Prepare a plurality of synthetic resins and apply 110% of the synthetic resin.
By applying the next coating treatment, the surface treatment finally provides the water resistance necessary for good water wettability on the surface and the water resistance necessary for corrosion resistance on the inner layer. Surface treatment method.