JPS61124547A - Fitting material made of aluminum or aluminum alloy having improved bending property - Google Patents

Abstract

PURPOSE:To obtain a fitting material made of Al, in which a crack, a peel-off, etc., are not generated on a coated film layer by bending, by performing successively chemical conversion coating film treatment, undercoat, baking printing, top coat, and a surface treatment of baking, to the Al surface. CONSTITUTION:A chemical conversion coating film treatment is executed to the surface of Al or an Al alloy by a conventional method, and thereafter, baking is executed by performing undercoat. In this regard, as for an undercoat paint, a room temperature drying type or baking type paint of polyester resin, fluorine resin or epoxy resin is used. Subsequently, a colored layer of various patterns is formed by printing, and as for a printing ink, a room temperature drying type or baking type ink of acryl resin, polyester resin or fluorine resin is used. Also, baking is executed by performing a top coat, and as for a top coat paint, a room temperature drying type or baking type paint of acryl resin, polyester resin, polyurethane or fluorine resin is used. In this way, a fittings material which is excellent in decorating property and design property is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a fitting material made of aluminum or aluminum alloy (hereinafter abbreviated as aluminum or aluminium) with improved bending workability.

Conventional technology Conventionally, aluminum materials used in aluminum fittings are anodized (anodized) and then electrolytically colored to give them corrosion resistance, but these treatments alone are not sufficient. Since it does not show sufficient corrosion resistance,
In addition, in order to improve aesthetics and design in order to meet the diversified needs of consumers, it is common practice to further print to form a colored layer such as a straight grain pattern, and then apply a K) flat coat on top of this.

On the other hand, apart from the above-mentioned surface treatment, aluminum H joinery materials, especially interior joinery materials, are also important in terms of processing.

One bending process is often performed to improve the design of the product.

Problems to be Solved by the Invention However, when bending is performed on an aluminum material that has been subjected to the conventional surface treatment described above, cracks and peeling occur in the coating layer, which causes problems both functionally and aesthetically. This has become a problem.

Therefore, an object of the present invention is to solve the above problems and to solve the following problems.
To provide an aluminum fitting material with improved bending workability that does not cause cranking or peeling of the coating layer even when bent, and in particular to provide an aluminum fitting material with excellent decorativeness and design. There is a particular thing.

The means to solve the problem and the non-invention are that if the base treatment for aluminum fittings as described in # is done with a chemical conversion film treatment, then undercoated and baked, the curve will be easy to work. This is based on the knowledge that the surface quality of the product is greatly improved, and it employs a series of surface treatments including chemical conversion coating treatment, undercoating, baking, printing (pre-drying if necessary), top coating, and baking.

Aspects of the Invention First, the chemical conversion coating treatment adopted as the base treatment for the aluminum fittings of the present invention includes various conventional treatment methods such as chromate treatment, phosphate treatment, and phosphate-chromate treatment. is applicable.

It is applied after pre-treatment such as degreasing and washing with water according to a conventional method. After this chemical conversion coating treatment, an undercoat is applied and baked, but the undercoat paint can be polyester resin, fluororesin, epoxy resin, acrylic resin, or a combination thereof. Ordinary-temperature-drying or baking-type paints such as those with * are preferred, and polyester resin paints are also preferred. When a thermosetting acrylic resin paint is used as an undercoat paint, if the film is thick, peeling may occur even at 30°C.

The coating thickness is as thin as possible, preferably 15 μm or less.

After the above-mentioned treatment, colored plates with various patterns such as straight grain and board grain are formed by an appropriate printing method such as offset printing, gravure offset printing, and screen printing. As printing ink,
Acrylic resin, polyester resin, polyurethane resin,
'xi such as fluororesin or a combination thereof
Dry or stoving inks are preferred, and inks containing acrylic or polyester resins are most preferably used.

After the printing process, preliminary drying is performed if necessary. Pre-drying is not an essential step, but if you dry it at around 80-100℃, there will be almost no printing flow during subsequent painting.
This is advantageous because the print can be maintained clearly.

After that, it is painted (top coat) and baked.

As the top coat paint, room temperature drying or baking type paints such as acrylic street resin, polyester resin, polyurethane, fluororesin, or a combination of these are preferred, but acrylic is also preferably used. It is a clear paint made of Jugetsuji or polyester resin.

The factors that contribute to the bending workability of aluminum fittings are:
In addition to the combination of the above surface treatment steps, there is also the cross-sectional shape of the material. For example, if we take an aluminum shoji shoji muntin as an example, one side wall of the cylinder with a rectangular cross section as shown in Figures 1 and 2 is opened, rather than one with a rectangular cross section as shown in Figure 3. A barrier 2α that is convex toward the outside as shown in FIG. 1 is formed on the inside, or a barrier 2h that is concave toward the outside as shown in FIG. )
It is preferable to have a cross-sectional shape that absorbs the strain. In the case of muntins Iα and IA of the cross-sectional shape shown in FIG.

As described above, when surface treatment is performed according to the present invention, R2
Bending workability of up to 0 can be obtained. In addition.

If paper pasting is required, the joints for inserting the opening spaces sAK of the muntins 1α and 1b shown in Figures 1 and 2 are as follows:
Preferably, it is made of rubber.

EXAMPLES The present invention will be specifically described below with reference to Examples.

Example 1 After degreasing and washing with water according to a conventional method, a muntin of an aluminum profile having the cross-sectional shape shown in Fig.
H1.6, liquid 8!35°C, time 20 seconds.

After performing chromate treatment under the conditions of a shower pressure of 0.7 kfP/cr/l, it was washed with water and drained and dried at 80°C.

The amount of chromate film produced in this process was 0°311
It was 7-.

Next, a polyester enamel paint (cream color) was applied as an undercoat (film thickness 15 μm) by air atomization electrostatic painting.
), then set for 10 minutes, baked at 1 gO 0 C for 30 minutes, and cooled.

Thereafter, a straight-grain pattern was printed using acrylic ink (brown) using gravure offset printing.

Next, top coat with acrylic #8 resin clear thread (film thickness 10 μm) by air electrostatic painting.

After setting for 10 minutes, it was baked at 185°C for 30 minutes.

The characteristics of the obtained product are shown in Cloth-1 below.

Example 2 The process was carried out in the same manner as in Example 1 except that the undercoat thickness was 30 μm. The treatment conditions and properties of the obtained product are shown in Table 1. Example 3 The treatment was carried out in the same manner as in Example 1 except that a thermosetting acrylic resin paint was used as the undercoat paint. Table 1 shows the processing conditions and characteristics of the treated products.

Example 4 Processing was carried out in the same manner as in Example 2, except that polyester ink was used as the printing ink and polyester resin paint was used as the top coat paint. Table 1 shows the processing conditions and characteristics of the obtained product.

Table 1 below also shows, as a comparative example, the results of products that were subjected to conventional anodizing treatment and electrolytic coloring, followed by printing and top coating.

Margin below Effect of the invention As described above, the aluminum fitting material of the present invention is as follows.

As a base treatment, instead of the conventional anodic oxidation treatment + electrolytic coloring treatment, a chemical conversion coating treatment + anta-coat + baking treatment has been applied. 1. It has excellent bending workability.
It has the advantage of not causing any cracks or cracks in the paint layer even when subjected to bending processing up to about 0.08%, and is a fitting material with excellent decorative and design properties.It can be especially used as an interior fitting material. .

[Brief explanation of the drawing]

1 to 3 are schematic perspective views showing examples of the shapes of the muntins of aluminum shoji screens. la, I, h, (c.=muntin, 2a, 2h-barrier.

Claims (1)

[Scope of Claims] 1. Bending workability characterized in that the surface of aluminum or aluminum alloy is subjected to a series of surface treatments including chemical conversion coating treatment, undercoating, baking, printing, top coating, and baking. Improved aluminum or aluminum alloy joinery materials. 2. The fitting material according to claim 1, wherein the undercoat paint is a room temperature drying type or baking type paint made of polyester resin, fluororesin, or epoxy resin. 3. The fitting material according to claim 1, wherein the printing ink is a room temperature drying type or baking type ink made of acrylic resin, polyester resin, or fluororesin. 4. The fitting material according to claim 1, wherein the top coat paint is a room temperature drying type or baking type paint made of acrylic resin, polyester resin, polyurethane, or fluororesin.