JPH0780273B2 - How to adjust the surface of painted objects and surfaces for painting - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base material, which is related to a ground layer, and a surface-conditioned coating base coated with a coating, and a method for adjusting the surface of the base.

Prior Art Painting is practiced today in various fields.

Generally, during coating, surface adjustment is performed to roughen the surface of the object to be coated, and in order to increase the contact area with the paint and enhance the adhesion, blasting or etching is performed and the surface is painted. Was there.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The cross-sectional shape of the surface of a coating base that has been blasted by the conventional technique had a wavy shape as shown in FIG.
This is for accelerating and injecting a granular abrasive to roughen the surface of the object to be coated, and it is unavoidable that the surface becomes wavy. In general, in order to further improve the adhesion, a primer having good adhesion to the object to be coated and the paint is applied to such a base for coating, and then the paint is applied to form a plurality of layers.
Further, when such a coated article is post-processed, there is a problem that the coating film is peeled off at the bent portion and the stretched portion to deteriorate the quality.

On the other hand, the surface of the coating base whose surface has been adjusted by etching has a rough surface like a worm as shown in Fig. 3, which allows direct coating of the paint without the use of a primer, and the adhesion is also a coating film. However, it has a high anchoring effect because it has an anchoring effect, and there are problems such as pollution problems of the etching solution and the need to perform etching by masking the unpainted surface.

The present invention solves the above problems, and an object of the present invention is to provide a coated article having excellent adhesion and corrosion resistance, and a method for adjusting the surface of a base for coating.

MEANS FOR SOLVING THE PROBLEM A metal foam is pressure-contacted or heat-pressure contacted with a metal surface to provide a sponge-like coating base, and the coated base is coated.

In particular, the metal foam to be joined has a pore size of 5 to 100 μm and a porosity of 30 to 90%.

Then, as a method for adjusting the surface of the coating base, a metal foam is pressed or heat pressed onto the surface of the metal to give a sponge-like shape.

Effect The present invention has the above-described structure, and the metal foam is bonded by pressure bonding or heat pressure bonding to make the metal surface into a sponge-like shape and then coated, so that the coating base can be strongly bonded without an adhesive, In addition, the coating material penetrates into the sponge-like holes and solidifies, and the metal forming the skeleton of the sponge firmly fixes the coating film to provide an anchor effect, so that a coated article having excellent adhesion can be formed. Further, even if the coating material adheres by the physical anchor effect and has low or no adhesion as a coating material, a coated article can be formed by one coat without using a primer.

It is important that the metal foam used is capable of penetrating the paint and is fine. 5-100μ depending on the properties of the paint
A range of m is desirable.

Further, the coating surface adjusting method of the present invention does not require an adhesive because it uses pressure contact for pressure-bonding the metal foam to the metal surface or heat pressure contact for heat-bonding, so that the bonding force is high and the heat resistance is also high. It has the heat resistance of a metal and can easily form a coating base having an excellent sponge-like shape.

EXAMPLES Examples of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a metal plate which is an object to be coated, 2 is a sponge-like metal foam which is joined, 3 is paint, and a part of which penetrates into a sponge-like hole and is solidified. The metal foam 2 used here is a metal gold foam having an average pore diameter of 30 μm and a porosity of 70%, and an aluminum plate having a thickness of 0.2 mm.

To bond the metal foam to the metal surface, use a stainless steel roll at a pressure of 150 Kg / cm ² at 300 ° C and use the same material with a thickness of 1.
A 5 mm aluminum plate was heat-pressed and bonded.

As described above, the sample 1 whose surface was adjusted by the coating surface adjusting method of the present invention and the aluminum plate sample 2 having the surface shape shown in FIG. Approximately 30μ of transparent coating of polytetrafluoroethylene resin, which is less prone to
It was applied to a thickness of m to prepare a test sample. At this time, in the blast-treated sample of the prior art, since the coating material did not adhere, a primer was applied in the middle to a thickness of about 10 μm, and after drying, a transparent coating of polytetrafluoroethylene resin was applied to a thickness of about 30 μm. 380 ° C for all samples
The paint was baked by heating for 10 minutes.

In order to evaluate the adhesiveness of the coating film using Samples 1 and 2 coated as described above, a notch having a width of 5 mm and a length of 50 mm was cut in the coating film, the end portion was peeled off, and the tensile strength was measured. In order to evaluate the corrosion resistance, each sample was suspended in a 1: 1 mixture of soy sauce and vinegar and the progress of corrosion was observed.

Further, using the above sample, a cup having a diameter of 40 mm and a height of 40 mm was drawn and the workability was investigated.

The above results are summarized in Table 1.

As is clear from Table 1, when the sample 1 of the present invention is compared with the sample 2 of the prior art, the adhesion strength of the coating film is about 3.5 times higher in the example of the present invention than in the conventional example. It became high. Also, the corrosion resistance was improved by about 6.4 times compared to the conventional example. Further, in the post-processability, peeling occurred on the side surface of the cup in the conventional example of sample 2, but in the example of the present invention of sample 1, there was no abnormality and it was invented that the workability after coating was excellent.

In the examples of the present invention, aluminum was used for thermocompression bonding with a roll, but similar effects could be obtained with other metals, cold pressure bonding, or pressure bonding such as pressing. Further, although the polytetrafluoroethylene resin paint is used as the paint, other paints also have the same effect.

Further, since no chemical treatment is used, it is needless to say that the surface can be easily adjusted without any pollution problem such as etching and no masking on one side.

EFFECTS OF THE INVENTION As is apparent from the above description, according to the present invention, the metal foam is bonded to the surface of the metal, and the coating base having a sponge-like shape is coated. It can bond strongly and has excellent adhesion of coating film.
The coating film does not peel off even after post-processing, and a coated article excellent in corrosion resistance can be provided.

Further, in the present invention, since the surface of the metal is adjusted so as to form a coating base having a sponge-like shape which is obtained by pressing or heat-pressing a metal foam, The surface can be adjusted efficiently and stably.

[Brief description of drawings]

FIG. 1 is a sectional view of a coated article in one embodiment of the present invention, FIG. 2 is a sectional view of a coating substrate adjusted by a blast treatment which is a conventional coating substrate surface adjusting method, and FIG. 3 is a conventional coating. FIG. 3 is a cross-sectional view of a coating substrate prepared by etching, which is a substrate surface adjusting method for coating. 1 ... metal plate, 2 ... metal foam, 3 ... paint.

Claims (3)

[Claims] 1. A coated article obtained by applying a metal foam to a surface of a metal by pressing or heat-pressing the surface of the metal to provide a coating base having a sponge-like shape, and coating the coating base. 2. The coated article according to claim 1, wherein the metal foam has a pore diameter of 5 to 100 μm and a porosity of 30 to 90%. 3. A method for adjusting a surface of a base for coating, which comprises forming a sponge-like shape by pressing or heat-pressing a metal foam on the surface of a metal.