JPS6156098B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, after coating and forming an adhesive layer 2 on a steel plate 1, a resin sol 3 containing an inorganic fiber reinforcing material is coated and forming on the adhesive layer 2, and then a weather-resistant coating is applied to the surface of the adhesive layer 2. The method of manufacturing a reinforced laminated steel plate is characterized by laminating and forming a high-quality film 4, and its purpose is to provide a reinforced laminated steel plate that is resistant to scratches and has good weather resistance through a simple process. to provide manufacturing methods.

The present invention will be explained in detail below based on the accompanying drawings. Although the surface of the steel plate 1 may be simply cleaned without being pretreated, it is preferable to use the steel plate 1 after being subjected to the following appropriate pretreatment, for example. That is, first, both sides of the steel plate 1 are galvanized or turn-plated (lead 70-98
%, 30 to 2% tin), etc., to form a plating layer 5 having a thickness of 1 to 30 μm. The zinc-plated layer 5 is subjected to a chemical conversion treatment such as zinc phosphate treatment or chromic acid treatment, and the turn-plated layer is electrolytically cleaned with a sodium orthosilicate solution to activate the surface and thicken it. Chemical conversion coating layer 6 with a diameter of 0.05 to 0.2μ
form. After performing the pretreatment in this manner, a baking adhesive such as one-component epoxy, acrylic/epoxy, or acrylic/phenol-modified vinyl is applied to the chemical conversion coating layer 6 to a thickness of 3 to 15 μm. Then, the adhesive layer 2 is formed by baking at a baking temperature of 175 to 240°C. A weather-resistant transparent film 4 is laminated on one or both sides of the adhesive layer 2 via a reinforcing material-containing resin sol 3. Here, FIG. 1 shows an example in which a film 4 such as acrylic is directly laminated on the reinforcing material-containing resin sol 3, and FIG. This is an example in which a film 4 such as vinyl fluoride resin is laminated on top of the film. Also, resin sol 3 with reinforcing material only on one side.
When laminating films 4 and 4, a similar or different type of film 4' may be laminated on the other surface as shown in FIG. 1, or a resin sol 7 may be applied as shown in FIG. It's okay. Here, an appropriate resin sol 3 containing inorganic fiber reinforcing material can be used, but for example, the wire diameter is 1 to 100 μm and the length is 5 to 1000 μm.
Polyvinyl chloride sol paint containing about 0.3 to 30% of inorganic fibers such as glass wool or rock wool as a reinforcing material is applied to 50 to 400μ, preferably 130 to
It is preferable to form by coating with a thickness of 200μ and baking at 180 to 220°C. As the films 4 and 4', those having good weather resistance are used, such as acrylic film having a thickness of 50 to 200 .mu.m, preferably 50 to 75 .mu.m, or vinyl fluoride resin film having a thickness of 25 to 100 .mu.m. The lamination temperature of the films 4, 4' is 175 to 240°C if the film is acrylic, and 190 to 240°C if it is a vinyl fluoride film. When using the vinyl fluoride film 4, it is preferable to interpose an adhesive layer 2' because the heat weldability is rather low. In addition, when applying vinyl chloride resin sol as resin sol 7 on one side, it is applied at a thickness of 50 to 350μ, and when applying a color top coat, it is applied at a thickness of 7 to 25μ.
It should be baked at 180-240℃. Incidentally, in the above, the baking was performed for each layer in sequence, but it may be performed all at once after the final layer is formed. Moreover, the coating can be applied by roll, (pressurized) spray, etc. as appropriate.

In the present invention, after the adhesive layer is applied and formed on the steel plate as described above, the reinforcing material-containing resin sol is applied and formed on the adhesive layer. The layer is strongly adhered and formed, and this layer of resin sol containing reinforcing material forms a hard layer with high hardness, making it possible to apply a scratch-resistant finish, making the steel plate less prone to scratches, and making the steel plate scratch-resistant. It improves the properties of the steel plate and prevents it from corroding, and since a weather-resistant film is laminated on top of this reinforcing resin sol layer, the properties will not deteriorate even when used outdoors for a long time. A highly durable cosmetic surface can be obtained with minimal use. Also, even if the film has good weather resistance, it will deteriorate over a long period of time and cracks will develop from the surface to the inside.
Even if paint film deterioration occurs in this way, the inorganic fiber reinforcing material stops the crack from progressing and suppresses the speed of paint film deterioration, making it difficult for cracks due to synthetic resin paint film deterioration to reach the surface of the steel plate. , even if it does reach the target, it can take a longer time to reach the target. In this way, in the present invention, a film with good weather resistance on the surface,
The inorganic reinforcing material present in the lower layer of this weather-resistant film makes it possible to prevent coating film deterioration in a double manner. Moreover, since the reinforcing material is used in a state mixed with the resin sol in advance, the reinforcing layer can be easily applied with a simple painting process, without the need for complicated processes such as pasting reinforcing mats or spraying with roving cutters. There are benefits to be gained.

The present invention will be specifically described below based on examples.

[Example 1] Both surfaces of a steel plate having a thickness of 0.35 mm were galvanized to a thickness of 20 μm, and a chemical conversion coating layer of 0.1 μm was applied to each surface by zinc phosphate treatment. A two-component acrylic/phenol modified vinyl resin adhesive (product name: Sony
16A39A/B) to a thickness of 5μ and heated to 1.5μ at 220℃.
Bake for a minute. Next, a polyvinyl chloride resin sol paint containing glass wool with a wire diameter of 20 μm and a length of 100 μm was applied to one side of the adhesive layer to a thickness of 150 μm, and baked at 200° C. for 1.5 minutes. Here, the vinyl chloride resin sol paint is PVC (=1000) 100
A white material whose main components were 20 to 70 parts of DOP, 100 parts of calcium carbonate, 2 parts of calcium stearate, and 5 parts of titanium white was used. Next, acrylic films with a thickness of 60μ (trade name Sanjiuren SD-002 film) were placed on both sides of this glass wool-containing polyvinyl chloride resin layer and the remaining adhesive layer, and heated and pressed at 200℃ for 10 minutes. We were able to obtain surface acrylic tops, vinyl chloride decorations, and glass wool-reinforced laminated steel sheets. This laminated steel plate withstood long-term outdoor use, had high surface hardness, and was resistant to scratches.

[Example 2] An adhesive layer was applied to both sides of a pretreated steel plate in the same manner as in Example 1, and a glass wool-containing polyvinyl chloride resin layer was formed on one side. Apply acrylic/epoxy adhesive to the surface of the layer to a thickness of 5 μm.
After baking at 200°C for 15 minutes, a 38μ thick vinyl fluoride resin film was layered on the surface and bonded by heating and pressing at 210°C for 1.5 minutes. Next, the same polyvinyl chloride resin sol paint as in Example 1 except that it does not contain glass wool was applied to the remaining adhesive layer, and baked at 200°C for 1.5 minutes to form a fluorinated vinyl resin top, vinyl chloride makeup, and glass wool reinforced laminate. Obtained steel plate. This laminated steel sheet had good weather resistance, high surface hardness and was resistant to scratches, and the decorative surface had high heat resistance.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted sectional view of an embodiment of the present invention;
FIG. 2 is a partially omitted sectional view of another embodiment same as the above. In the figure, 1 is a steel plate, 2 is an adhesive layer, 3 is a reinforcing material-containing resin sol, and 4 is a film.

Claims (1)

[Scope of Claims] 1. After coating and forming an adhesive layer on a steel plate, coating and forming a resin sol containing an inorganic fiber reinforcing material on the adhesive layer, and then laminating a film with good weather resistance on the surface. A method for producing reinforced laminated steel sheets characterized by: 2. The method for manufacturing a reinforced laminated steel sheet according to claim 1, wherein the laminate film is an acrylic film. 3. The method for producing a reinforced laminated steel sheet according to claim 1, wherein the laminate film is a vinyl fluoride resin film.