JPS58217679A - Laminate treatment of aluminum or aluminum alloy - Google Patents

Abstract

PURPOSE:To obtain a laminate processed mold material in the reduced number of working processes without using a large amount of chemicals causing a public nuisance generating source, in the treaing process of an extrusion mold material comprising an Al material, by forming a boehmite skin film on a material to be treated at the time of hot extrusion molding thereof. CONSTITUTION:When a material to be treated such as Al or an Al alloy is subjected to hot extrusion molding, a boehmite teating liquid is blown onto the surface of the material to be treted held under a high temp. state directly after extrusion molding and a boehmite skin film is instantaneously formed on the surface thereof by the remaining heat of the mold material itself. This treting liquid may be usual pure water or aqueous ammonia. In the next step, this mold material is applied to a stretcher to carry out stress correction and, after cutting, ageing treatment due to heat tratment is applied. Because the mold material undergoing ageing treatment already has the boehmite skin film formed thereon, it is unnecessary to apply special chemical forming film treatment or anodic oxidation film treatment after ageing tretment. Therefore, the mold material undergoing ageing treatment is directly sent and supplied to a processing machine and a surface decorating sheet is adhered to the mold material by an adhesive to obtain a product.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for laminating aluminum or an aluminum alloy (hereinafter both are simply referred to as aluminum), and more specifically, the present invention relates to a method for laminating aluminum or an aluminum alloy (hereinafter referred to simply as aluminum). During extrusion molding, a boehmite treatment liquid is sprayed onto the surface of the treated material in a high temperature state immediately after extrusion from the extrusion molding machine to form a boehmite film, followed by stretcher and aging treatment. This invention relates to a novel method for treating aluminum and ram, which is characterized by laminating a surface coating (V-) on the boehmite film surface of the treated material.

Traditionally, the most common processing steps for aluminum extrusion sections are extrusion → stretcher → aging treatment + (racking) → degreasing → matting → neutralization → chemical conversion coating or anodizing coating → painting → baking → (rack removal).

On the other hand, a treatment method has been developed in which a surface coating such as vinyl chloride (Y++) is laminated instead of a paint film on the surface of the treated material for the purpose of improving corrosion resistance and decoration, etc., and has been applied to the production of high-grade aluminum sash with wood grain patterns, etc. ing.

To carry out the lamination process, an adhesive is used on the adhesion surfaces of the material to be treated and the facing V-), and the surface device y-) is attached to the surface of the material to be treated while being pressed from the outside with a roll. At that time, if a chemical conversion film or an anodic oxide film is applied to the treated material, the adhesion between the two will be good, but if these films are not applied, the adhesion of the surface coating y) may be poor and insufficient. Adhesive strength cannot be obtained.

However, in order to apply chemical conversion coating treatment or anodic oxidation coating treatment to the surface of the material to be treated, the conventional method involves racking the aluminum extruded shape after aging treatment, as can be understood from the treatment steps mentioned above. The rack must be removed after the chemical conversion coating or anodic oxidation coating has been applied without being sequentially immersed in a large number of treatment tanks, which requires a large number of man-hours and increases costs. Since large amounts of industrial water and chemicals such as acids and alkalis are used, there is a problem in that wastewater treatment requires a large amount of capital investment and appropriate wastewater management from the standpoint of pollution prevention.

As a result of intensive research into the above-mentioned problem, the present inventor found that during hot extrusion molding of aluminum, the shape immediately after extrusion is at a high temperature of around soo'b. If a boehmite treatment solution is applied to an extruded shape, a boehmite film can be formed on the surface of the shape due to the residual heat of the shape itself during folding, and such a boehmite film is incomplete for fixing the paint film. However, when laminating the facing sheet, since the breaking strength of the sheet is relatively low, we focused on the fact that the adhesion strength between the boehmite film and the facing sheet sufficiently exceeds the breaking strength of V-T, and initially We have succeeded in developing the new aluminum lamination processing method described above.

Next, to explain the embodiments of the present invention in more detail, in the laminating method according to the present invention, in the hot extrusion molding process of aluminum, the extruded shape immediately after being extruded from the extrusion molding machine is A boehmite treatment liquid is sprayed onto the material to form a boehmite film on the surface of the extruded shape.

At that time, the shape immediately after extrusion molding is heated to a high temperature of 500℃ after bending, so when the boehmite treatment liquid is sprayed on it, the boehmite treatment, which would require at least 5 to 10 minutes with normal treatment methods, will be completed. is completed in an instant~L0
In this case, the time required for the spraying of the boehmite treatment liquid on the extruded shape differs depending on the liquid composition, the heating temperature, and the amount of spraying, but it may take 1 to 10 seconds. If the distance is 0.5 to 5 m in the direction, the effect will be fully exhibited.

The liquid composition of the paemite treatment liquid may be commonly used pure water, ground water, or an aqueous solution of triethanolamine, ammonia, diethylamine, etc., and the liquid temperature can sufficiently exhibit its effect at room temperature. The higher the heating temperature of the extruded shape, the greater the effect.<% If the heating temperature is 400°C or higher, the effect is significant.

The extruded shape with a boehmite film formed on its surface as described above is then put on a stretcher to correct distortion, cut into predetermined dimensions, and then subjected to aging treatment by heat treatment depending on the intended use of the product.

Extruded shapes that have undergone aging treatment already have a boehmite film formed on their surface during extrusion molding, so there is no need for special chemical conversion coating treatment or anodic oxidation coating treatment, and they can be immediately laminated. Feed it to the machine, interpose an adhesive layer between the extruded shape material and the facing sheet, and attach it while pressing the facing V-) from the outside with a roll. At that time,
The facing sheet can be printed or embossed with a wood grain pattern, etc., or resin-treated paper impregnated or coated with synthetic resin, decorative paper treated with vinyl chloride or polyester resin, etc. Regarding the form, it is possible to use a film in which an adhesive layer is formed on the back surface of a single film, a film in which a film is lined with cloth, paper, or the like.

When the above-mentioned series of lamination treatments are applied to the aluminum extruded material to be treated, for example, if the material of the facing V-) is vinyl chloride and the thickness is 1.8H, the breaking strength of the sheet in the tensile test is Even if the boehmite treatment time is extremely short, if a boehmite film is formed immediately after extrusion molding, the adhesion strength between the treated material and the surface coating V-)- will already be V. -) far exceeds the breaking strength.

Therefore, according to the method of the present invention, there is no need to perform complicated chemical conversion coating treatment or anodic oxidation coating treatment on the surface of the material to be treated in order to improve the layer density of the facing sheet, which is also a cause of pollution. This method significantly simplifies the entire processing process and allows the production of beautiful and durable aluminum moldings at low cost.

Typical examples of the method of the present invention and comparative examples thereof are listed below, but the present invention is not necessarily limited to these examples.

Example 1 Aluminum alloy (6063) was hot extruded using an extrusion molding machine at a bead temperature of 450°C, at a rate of 231 m/min.
A boehmite film was formed on the surface of the shape while spraying pure water (spray amount: 1.2ζ1!l) over one length of the shape to be extruded at speed B. Next, this shape was placed on a stretcher to correct the distortion, cut to a certain size, and then subjected to aging treatment by heat treatment at a temperature of 200° C. for 90 minutes.

Then, apply Kanebo N Varnish 0V- to the surface of the shape.
Bondmaster SL, -901 manufactured by Co., Ltd. was applied to a thickness of 5P by spraying, while Kanebo N. Varnish V was applied to the back side of the facing (P) made of vinyl chloride resin.
- After applying Bondmaster RL-306 manufactured by Co., Ltd. to a 100μ island (wet) using a knife coater method, it is pasted on the painted surface of the shape, and 2-pressure is applied from the outside surface using a roll. Pressed with.

After leaving this at room temperature for 3 days, heat-cool cycle (60
℃×8 hr--20℃×16 hr) was repeated for 10 cycles.

For this sample, the mounting V was applied at a tensile speed of 301-Ln.
-) was peeled off at 180 degrees, and V-) was broken.

Example 2 Sirinium alloy (6063) was hot extruded using an extrusion molding machine at a billet temperature of 450°C at a rate of 15111 m/min.
A boehmite film was formed on the surface of the shape by spraying ground water over a length of 2+a (spray amount: O1/min) to form a shape that was extruded at a speed of 6. Next, the shape was placed on a stretcher and strained. After straightening and cutting to a certain size, aging treatment was performed by heat treatment at a temperature of 200° C. for 90 minutes.

After that, Kanebo N Varnish V- was applied to the surface of the shape.
Co., Ltd.'s Bondmaster BLq-901' was sprayed to a thickness of 5 μm, and on the other hand, the back side of the facing V-) made of agglomerated vinyl resin was coated with money N varnish bow-Co., Ltd. Sea bream Pond Master RL-306 was applied to a coating thickness of 1 ωμ (wet) using a knife coater method, and then adhered to the simple surface of the shape, and pressed from the outer surface with a pressure of 2 with a roll.

After leaving this at room temperature for 3 days, it was heated and cooled.
ao°C x 81r -- 20°C x 16 kr) was repeated for 10 cycles.

When this sample was subjected to the same breaking test as in Example 1, the average tensile strength of the facing sheet was IIKQ per inch width.

Comparative Example A A/l = Um alloy (6063) was hot extruded using an extruder at a billet humidity of 450°C. After that, no boehmite film formation treatment was performed, and other treatments were carried out in the same manner as in the examples. When the resulting sample was subjected to the same breaking test as in Example 1, the average tensile strength of the facing F-) was S kg per inch width.

Claims (1)

[Claims] During hot extrusion molding of a material to be treated made of aluminum or aluminum alloy, a boehmite treatment liquid is applied to the surface of the material which is in a high temperature state immediately after being extruded from an extruder to form a boehmite film. 1. A method for laminating aluminum or an aluminum alloy, which comprises laminating a surface plate on the surface of a boehmite film of a material to be treated, after being subjected to stretcher and aging treatment.