JPS6119337A - Laminating method of decorative sheet made of synthetic resin onto aluminum material - Google Patents

Abstract

PURPOSE:To toughen adhesive properties of a decorative sheet on the surface of a coat, by sticking the decorative sheet made of synthetic resin with an adhesive agent after forced steam treatment or hot-water washing treatment which is replaceable with the former forced steam treatment. CONSTITUTION:A coat is formed of transparent clear painting or colored painting in a desirable color tone after surface treatment and painting of an aluminum base. Forced steam treatment or hot-water washing treatment which is replaceable with the former forced steam treatment is applied to the painting. Ether link and urethane link of construction of a coat are hydrolyzed, polarity is improved by increasing a hydroxyl group, and compatibility with an adhesive agent becomes large. An excess solvent is volatilized by hot air after the adhesive agent has been applied to the back of a decorative sheet, which is stuck on the surface of the coat by pressing the same with a rubber roller. As adhesive force is toughened through this modification of the compatibility, laminate processing of the surface of the coat and decorative sheet made of synthetic resin becomes possible. In addition to the above, fresh designing effect can be displayed through combination of the coat and a printed pattern on the surface of the decorative sheet.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention provides a decorative sheet made of synthetic resin such as vinyl chloride resin on the surface of various aluminum materials such as extruded aluminum shapes and aluminum plates after being painted. It relates to a method of laminating.

[Technical background of the invention and its problems]

Generally, aluminum materials (including aluminum alloy materials)
Because it has a weak point in corrosion resistance, it is rarely used as a raw material, and after pretreatment by conventional methods, a chemical film or anodic oxide film is formed on the surface, and then a thermosetting acrylic resin paint or other coating is applied to the surface. It is often used with transparent or colored coating such as polyurethane resin paint. Recently, in order to improve the design effects of these materials, products laminated with synthetic resin decorative sheets such as vinyl chloride printed with woodgrain patterns and other various patterns and colors have been attracting attention. Various lamination processes are carried out depending on the material and shape of.

However, when laminating a decorative polyvinyl chloride sheet onto an extruded aluminum profile, for example, the surface of the paint film after painting has a very high degree of crystallinity (low polarity, so
Since the self-cohesive force is strong and the compatibility with the adhesive is low, the adhesion strength with the adhesive is weak and there is a risk of it peeling off easily. The adhesive is applied to the back side of the decorative sheet using a knife coater method, and the adhesive is passed through a hot air oven to volatilize the solvent contained in the adhesive. Lamination is carried out by applying direct pressure to the decorative sheet in stages with a pressure roller.

However, if a laminating method for strongly adhering and fixing the above-mentioned decorative sheet to the surface of the paint film could be established by some means, since aluminum material has extremely good surface treatment properties, for example, After applying satin finish or polishing to the aluminum base material, anodizing treatment is applied, and coloring treatment is performed by dyeing or electrolytic coloring, followed by clear coating treatment to maintain durability and design effects for a long time. , and then laminate the whole or part of it with a decorative sheet made of polyvinyl chloride (printed with wood grain patterns, abstract patterns, floral patterns, etc.), and if the coating film is colored, apply a pigment Since various shades can be obtained depending on the color, completely novel design effects can be expressed by combining these tones with decorative sheets.

[U-Objective of the Invention] Based on the above-mentioned viewpoints, an object of the present invention is to strengthen the adhesion of a decorative sheet to the coated surface of an aluminum material, and to improve the coating of the surface of the aluminum material and the printed pattern on the surface of the decorative sheet. The aim is to achieve a new design effect through the combination of ICs and to improve the durability of aluminum materials.

[Structure of the invention]

The laminating method of the present invention was developed to achieve the above-mentioned object, and after applying a pressurized steam treatment or an alternative hot water washing treatment to aluminum materials (including aluminum laminated materials) after painting treatment, This method is characterized by attaching a decorative sheet made of synthetic resin via an adhesive.

Looking at the lamination method according to the present invention in more detail, the aluminum material used as the base material is first subjected to normal pretreatment such as blood removal and water washing, and then subjected to satin finish treatment, chemical polishing, electrolytic polishing, etc. as necessary. , anodized in an aqueous solution of inorganic or organic acids such as sulfuric acid or oxalic acid to form an anodized film on the surface, and then, depending on the case, coloring by dyeing or electrolytic coloring, or chromic acid. Alternatively, a chemical film is formed on the surface using a treatment liquid such as phosphate, and then a thermosetting acrylic resin paint or polyurethane resin paint is used to improve the durability of the aluminum material and maintain the design effect for a long time. Then, in the method of the present invention, the coating film on the surface of the aluminum material is applied with pressure. Steam treatment or alternative hot water washing treatment is performed to hydrolyze the ether bonds and urethane bonds in the coating film structure using water and temperature (100 to 140°C), increasing the number of hydroxyl groups in the coating film and increasing its polarity. Then, the coating film is modified to increase its compatibility with the adhesive described later.

In this case, the appropriate pressurized steam treatment conditions differ slightly depending on the type of coating film, but the steam pressure is 0.5 to 5.0 KIi1
101 for 10 to 60 minutes, and excessive vapor pressure and treatment time may cause deterioration of the coating film.

After this, when laminating a synthetic resin decorative sheet on the surface of the paint film, a polyvinyl chloride resin sheet that has good weather resistance and is easy to print is used as the material for the decorative sheet.
You can also use other synthetic resin sheets (print a wood grain pattern, abstract pattern, floral pattern, etc. on the surface of the sheet, and apply 50 P of adhesive to the back of the decorative sheet using a knife coater before pasting.
After coating to a thickness of -200 μm, excess solvent is volatilized with hot air at 30 to 50° C., and this decorative V-) is adhered to the surface of the coating film of the aluminum material while being pressed with a rubber roller. Adhesives used for the above-mentioned lamination processing include phenolic resin, resorcinol resin, furan resin, polyurethane resin, epoxy resin, and polyvinyl chloride resin adhesives, but the viscosity, solid content, and type of solvent of the adhesive If you adjust it to make it suitable for application with a knife coater,
Any adhesive can be used, and knife coaters often use polyurethane resin, polyvinyl chloride resin, etc.

[Embodiments of the invention]

Hereinafter, the specific embodiments and effects of the present invention will be explained using four typical examples of the present invention and comparative examples thereof, but the present invention is not necessarily limited to these examples. It's not something you can do.

Example 1 '70 x 200 x 1.8t (7) 7 Luminilla A extruded material (6063s-T5) was subjected to normal sulfuric acid alumite processing, and then thermosetting acrylic resin paint Nisvia ED2 was applied.
00 Clear (manufactured by Shinto Paints KK), coating thickness 7μm
Electrodeposition coating was performed, followed by baking drying at 200°C for 30 minutes, followed by pressurized steam treatment at tC2 atmospheres for 30 minutes.

Using a knife coater, the polyurethane resin adhesive Bondmaster RL906 (
(manufactured by Kanebo NSC) was applied to a thickness of 100 coats and laminated while being pressed with a pressure roller. This is 7
Table 1 shows the adhesive strength after being left for days.

Comparative Example 1 Table 1 shows the adhesive strength of a laminated test piece prepared in Example IK but omitted from the pressurized steam treatment of the coating film and left for 7 days.

1j! Example 2 70X200XL8t aluminum extrusion profile (606
35-T5) was subjected to normal sulfuric acid alumite processing, and then thermosetting acrylic resin paint Door Repaint) 89000
A test piece was dip-coated with clear (manufactured by Toa Paint Co., Ltd.) to a film thickness of 7 μm, baked at 20°C for 30 minutes, and then subjected to pressurized steam treatment at TC4 atm for 30 minutes. Vinyl decorative sheet (thickness o, 16”
The polyurethane adhesive Bondmaster R1,910 (manufactured by Kanebo [80]) was coated with a thickness of 80 μm using a knife coater on the back side of the paper, and was laminated while being pressed with a pressure roller. The adhesion strength after leaving this for 7 days is shown in Table IK.

Comparative Example 2 Table 1 shows the adhesion strength when the laminated test piece was left for 7 days without the pressurized steam treatment of the coating film in Example 2.
Shown below.

Example 3 A 70' x 200 x 1.8 t aluminum extruded section (AO6:5s-T5) was made using Puntilite 723 (
Chemical film treatment is applied using chrome-based paint (manufactured by Nippon Barker Rising Co., Ltd.), and then polyurethane-based resin paint v-top aW is applied.
A test piece was electrostatically coated with bronze (manufactured by Dainippon Toyo Co., Ltd.) to a coating thickness of 20 μm, dried at 80°C for 10 minutes, and then subjected to pressurized steam treatment at 1 atm for 20 minutes. PVC decorative sheet with wood grain pattern (thickness 0.16-
/rr*) was coated with a polyurethane resin adhesive (manufactured by Konishi Bond Co., Ltd.) to a thickness of 50 μm using a knife coater and then laminated while being pressed with a pressure roller. Table 1 shows the adhesive strength after allowing this to stand for 7 days.

Comparative Example 3 Table 1 shows the adhesive strength when the laminated test piece was left for 7 days without the pressurized steam treatment of the coating film in the above Example @3.
Shown below.

Example 4 A 70 x 200 x 1.8 t aluminum extruded shape (60638-T5) was subjected to normal sulfuric acid alumite processing, and then thermosetting acrylic resin paint Nisbia HD 20
Test pieces were electrodeposited with 0 Clear (manufactured by Shinto Paints KM) to a film thickness of 7 μm, baked at 200°C for 30 minutes, dried, and then immersed in boiling water for 30 minutes.
PVC decorative sheet with wood grain pattern (thickness 0.
Apply polyurethane resin adhesive Bond Master RL906 (Kakibo N80) to the back side of the
Co., Ltd.) was applied to a thickness of 100 μm and was laminated while being pressed with a pressure bonding p-ler. The adhesion strength after leaving this for 7 days is shown in Table IK.

Comparative Example 4 Table 1 shows the adhesion strength when the test piece laminated in Example 4 without the pressurized steam treatment of the coating film was left for 7 days.
Shown below.

Table 1 Adhesive strength of laminate materials The adhesive strength in the table was measured using a tensile tester with a peel strength of 180 and a test piece width of 1 inch at a tensile rate of 50%.

〔Effect of the invention〕

As mentioned above (according to the present invention method), when laminating a decorative sheet made of synthetic resin onto an aluminum material that has been painted, the surface of the paint film must be subjected to a pressurized steam treatment or an alternative hot water washing treatment. The ether bonds and urethane bonds in the coating structure are hydrolyzed using water and temperature to increase the number of hydroxyl groups in the coating film, increasing its polarity and greatly improving its compatibility with adhesives. Since the sheets are laminated, the adhesive force between the painted surface and the decorative sheet is strengthened several times as shown in Table 1. As a result, synthetic resin decorative sheets can be applied to the painted surface, which was difficult to do with conventional techniques. The combination of the coating film on the surface of the aluminum material and the printed pattern on the surface of the decorative sheet creates a completely new design effect, as well as improving the durability of the aluminum material.

Claims (1)

[Claims] A synthetic resin decorative sheet for an aluminum material, characterized in that the synthetic resin decorative sheet is attached via an adhesive after applying pressurized steam treatment or an alternative hot water washing treatment to the painted aluminum material. How to laminate.