JP2584080B2 - Surface adjustment method for paint base - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated article obtained by applying a coating to a surface-adjusted coating substrate and a method of adjusting the surface of the substrate.

2. Description of the Related Art Painting is performed today in various fields.

In general, blasting and etching are performed when painting to make the surface of the object to be roughened to increase the contact area with the paint and increase the adhesion, and then the surface is painted. I was

Problems to be Solved by the Invention The cross-sectional shape of the surface of a blast-treated coating substrate, which is a conventional technique, had a wavy shape as shown in FIG. This is to roughen the surface of the object to be coated by accelerated injection of a granular abrasive, and it is difficult to prevent the surface from becoming wavy.
In order to further enhance the adhesiveness, a primer having good adhesiveness to an object to be coated and a paint is generally applied to such a base material for coating, and then the paint is applied, so that a plurality of layers must be formed. In addition, when such a coated product is post-processed, there is a problem in that the coating film is peeled off at a bent portion or a tensile portion and the quality is deteriorated.

On the other hand, the base for painting whose surface has been adjusted by etching is
As shown in FIG. 3, the surface becomes a bug-like rough surface,
Paint can be applied directly without using a primer,
In addition, the adhesion is high because the coating film has an anchoring effect such that the coating film does not have a pit-like hole. However, there are problems such as the problem of pollution of the etchant and the necessity of masking and etching the unpainted surface.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a method for adjusting the surface of a coating undercoat having excellent adhesion and corrosion resistance.

Means for Solving the Problems The present invention, in order to achieve the above object, on the surface of a metal,
Various coatings are applied to a coating base having a hole having a pot-like shape with a wide inside and a closed mouth portion.

Then, as a method of adjusting the surface of the coating base, the surface of the metal as the object to be coated is pressed with a needle-shaped jig, or the powder is pressed and pressed, and then the powder is dissolved or removed. By pressing and pressing the powder of a material having an etching property and dissolving the powder at the same time as forming a hole by etching the metal around the powder, and further gently crushing the metal surface Things.

The present invention has the above-described configuration, and the paint penetrates and hardens into a pot-shaped hole having a wide inside and a narrowed mouth portion, so that the mouth portion of the hole firmly fixes the coating film and provides an anchor effect. Therefore, a coated article having excellent adhesion can be formed.

In addition, since the coating material adheres due to the physical anchor effect, even a coating material having low or no adhesion as a coating material can be coated with one coat without using a primer.

In addition, the method of adjusting the surface of the paint base is such that holes of a predetermined number, depth, and size are formed in a predetermined area over the entire surface of the coating by pressing with a needle at all times, pressing and pressing and dissolving and removing powder. The opening can be formed evenly and easily on the metal surface, and the mouth can be narrowed by squeezing the surface lightly, so that a pot-like hole having a wide inside and a narrowed mouth can be easily formed.

Another method of adjusting the base surface for coating is to press the powder of a material that has an etching property with respect to the metal, press the powder into the metal surface, and etch around the powder when dissolving and removing it with a solvent such as water. Therefore, it is usually not necessary to crush the surface lightly thereafter, but if necessary, the surface may be lightly crushed to further narrow the mouth. Either method can be easily formed into a pot-like hole having a wide inside and a narrowed mouth. At this time, of course, the powder is pushed into only the metal coating surface to remove by etching, so that one-side masking or the like as in ordinary etching is not required, and a special etching device is not required.

Examples Examples will be described below with reference to the accompanying drawings.

In FIG. 1A, reference numeral 1 denotes a metal plate as an object to be coated;
Denotes a pot-shaped hole whose surface is adjusted to have a surface and which has an opening and which has a narrowed mouth. Reference numeral 3 denotes paint, and a part of the paint enters the pot-shaped hole 2 and is solidified. Pot-shaped hole 2 has an inner diameter of 10 ~
The size is about 200 μm, and may be changed depending on the properties of the paint 3 or metal plate used.

FIG. 1 (b) shows a needle-shaped jig in which a plurality of stainless needles 4 each having a diameter of 100 μm are bundled in a sword mountain shape, and is struck against an aluminum metal plate 5 as an object to be coated, to a depth of about 50 μm and a size of about 50 μm.
This is a simplified illustration of a state in which holes having a substantially uniform shape with an interval of about 70 to 200 μm are formed, and the surface is lightly crushed with a stainless steel roll at a pressure of about 150 kg / cm ² .
Pressing with a needle-shaped jig may be performed by a press or a roll, and crushing the surface lightly may be performed by a press or the like.

FIG. 1 (c) shows that NaCl powder 6 having a particle size of 50 to 100 μm is pressed into an aluminum metal plate 5 by a roll at a pressure of about 150 kg / cm ² , and NaCl is dissolved and removed with hot water at 60 ° C. Further, a state in which the surface is lightly crushed with a stainless steel roll at a pressure of about 150 kg / cm ² is simply illustrated. The powder used is most preferably an inorganic salt having solubility in water, but other solvents or powders may be used. Although a roll is used in each step, it may be performed by a press or the like. The powder can be recovered by drying the solvent, and can be reused by adjusting the particle size.

FIG. 1 (d) shows that NaOH powder 7 having a particle size of 30 to 50 μm is pressed into an aluminum metal plate 5 with a roll at a pressure of about 150 kg / cm ² , and NaOH is dissolved in hot water at 60 ° C. The aluminum plate was etched, neutralized with a 5% nitric acid aqueous solution, and washed and removed, as shown in the figure. Since aluminum is an amphoteric metal, it can be etched with either an alkali or an acid. Therefore, a powder whose solution shows alkali or acid may be used. NaOH is soluble and should be kept dry.
Removed just before the roll.

FIG. 1 (e) shows an aluminum metal plate 8 having a thickness of 0.1 mm.
One with φ0.1, the other with a conical hole with an opening with a diameter of φ0.2, align the opening with a φ0.2 diameter on an aluminum metal plate with a thickness of 1.0mm, About 150 by roll
It was thermocompressed at a pressure of kg / cm ² .

As described above, FIG. 2 shows a sample whose surface was adjusted by the four methods of adjusting the surface of the base material for coating according to the embodiment of the present invention (sample numbers 1 to 4 in order) and FIG. Using a sample of the aluminum plate having the indicated surface shape (sample No. 5), a transparent paint of polytetrafluoroethylene resin having low adhesion to aluminum was applied to a thickness of about 30 μm to prepare a test sample. At this time, since the paint of the prior art blast treatment did not adhere, the primer was applied to a thickness of about 10 μm in the middle and dried, and then a transparent paint of polytetrafluoroethylene resin was applied to a thickness of about 30 μm. All samples were heated to 380 ° C. for 10 minutes to bake the paint.

In order to evaluate the adhesiveness of the coating film using Samples 1 coated as described above, a cut of 5 mm in width and 50 mm in length was made in the coating film, the end was peeled off, and the tensile strength was measured. Also,
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. The results are summarized in Table 1.

As is clear from Table 1, when comparing Sample Nos. 1 to 4 according to the embodiment of the present invention with Sample No. 5 according to the prior art, the adhesion strength of the coating film was lower in each case than in the embodiment according to the present invention. Was about 3.2 to 3.5 times higher than the conventional example. Also, the corrosion resistance was improved about 6.3 to 6.7 times compared to the conventional example.

Further, using the sample, a cup having a diameter of 40 mm and a height of 40 mm was drawn and the workability was examined. Sample number 5
In the prior art, the peeling occurred on the side surface of the cup. However, in the examples of the present invention of sample numbers 1 to 4, the peeling did not occur at all, and it was found that the workability after coating was excellent.

In the embodiment of the present invention, a polytetrafluoroethylene resin paint is used, but the same effect can be obtained with other paints.

Advantageous Effects of the Invention As is apparent from the above description, according to the present invention, a coating in which a hole having a pot-like shape having substantially the same size and having a widened inside and a narrowed mouth portion is formed on a metal surface. Since the coating is applied to the substrate, it is possible to provide a coated material which is excellent in adhesion of the coating film, does not peel off even when subjected to post-processing, and has excellent corrosion resistance.

Further, the present invention provides a method in which a needle having a needle-shaped jig presses a surface of a metal as an object to be coated, and a predetermined number, a depth, and a hole having a substantially uniform shape of a predetermined size are formed on the entire surface of the coating surface. After forming evenly, lightly crush the surface, or press and push a powder of a predetermined size on the metal surface as the object to be coated, dissolve and remove the powder, and crush the surface lightly Since the surface of the base for painting is adjusted by forming a hole having a pot-like shape with a wide inside and a narrowed mouth, the above-mentioned base for painting of the object to be painted is efficiently used. The surface can be adjusted stably.

Similarly, the present invention provides a method in which a powder of a material whose solution has an etching property with respect to the metal is pressed and pressed onto the surface of the metal as a coated object, and then the powder is dissolved with a solvent and the metal around the powder is simultaneously removed. Etching and, in some cases, lightly crushing the surface to form a hole having a pot-like shape with a wide inside and a narrowed mouth part to adjust the surface of the coating base, as described above It is possible to effectively and stably adjust the surface of a coating base of a coating product.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a method of adjusting the surface of a coating object and a coating substrate in one embodiment of the present invention, and FIG. 2 is a cross-sectional view of a coating substrate adjusted by blasting, which is a conventional method of adjusting a coating substrate surface. FIG. 3 is a sectional view of a coating base adjusted by etching, which is a conventional coating base surface adjustment method. 1 ... metal plate, 2 ... holes, 3 ... paint.

Claims (4)

(57) [Claims] 1. An approximately uniformly shaped hole having a predetermined number, depth, and size is formed on a surface of a metal as an object to be coated on a predetermined area by pressing with a needle-shaped jig. And then crushing the surface lightly to form a hole having a pot-like shape with a wide inside and a narrowed mouth. 2. A pot-shaped powder having a predetermined size is pressed and pressed into the surface of a metal as an object to be coated, and then the powder is dissolved and removed. A method of adjusting the surface of a paint base by lightly crushing the surface to form a hole having a shape. 3. A powder of a material having an etching property with respect to a metal is pressed into a surface of a metal as an object to be coated with a predetermined size, and then the powder is dissolved with a solvent and simultaneously. A method of adjusting the surface of a base material for painting by etching a metal around the body and forming a hole having a pot-like shape with a wide inside and a narrowed mouth portion. 4. The method according to claim 3, wherein the surface is lightly crushed after etching.