JP2001058155A - Method for increasing weatherability of peelable paint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase weatherability by forming a coating film on the surface of an article to be coated from a plastic paint and subsequently forming a coating film comprising an aluminum paint on this coating film. SOLUTION: A plastic paint 13 is prepared, for example, by dissolving a coating film-forming component such as a vinyl resin or a styrene/butadiene rubbery resin in a solvent such as aromatic hydrocarbon or alcohols, and contains an additive in order not only to make this paint 13 easily peelable but also to suppress the adhesion thereof. The plastic paint 13 is applied to the washed surface of an article to be coated, such as a pipe 11, by general brush coating or spray coating. An aluminum paint 14 having weatherability is applied to the coating film of the plastic paint 13 and prepared by dispersing a scaly aluminum powder in a coating film forming component such as a vinyl resin or the like dissolved in a solvent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for applying a paint for protection to an object to be coated or the like in order to protect the metal material from temporary rust prevention, corrosion protection or sea breeze, and to apply the paint after a predetermined period of time. The present invention relates to a method for reinforcing the weather resistance of a strippable paint that can be peeled off.

[0002]

2. Description of the Related Art Conventionally, plant piping has been susceptible to rust and corrosive due to exposure to wind and rain and solar radiation. Therefore, a paint having weather resistance has been applied for the purpose of preventing the generation and corrosion of such rust. In particular, pipes of plants installed in the beach area were always coated with highly weather-resistant paint because they were exposed to sea breeze and moisture. However,
For stainless steel pipes such as LNG plants, a full-scale weather-resistant paint is applied to the surface of the pipes after welding, until a pressure test, a liquid leak test, a gas leak test, etc. are completed. I couldn't do that. However, if the exposed pipe is exposed to sea breeze for several months after the completion of the plant, stress corrosion cracking may occur in the welded part of the pipe that has been subjected to thermal stress.

[0003] Therefore, a protective tape has been conventionally wrapped around piping of a plant installed in a seaside area before a weather-resistant paint is applied in order to temporarily prevent rust and corrosion. This protective tape 1 is a tape in which an adhesive 3 made of an acrylic resin is applied to a base material 2 of a vinyl chloride film as shown in FIG. This protective tape 1
Was a tape having a large film thickness and therefore had sufficient weather resistance, and could be easily wound around a pipe or the like while peeling off from the release paper 4. In addition, this protection tape 1 can be easily peeled off immediately after the various tests of the piping of the plant are completed and immediately before the weather-resistant paint is finally applied.

[0004] In order to temporarily prevent the generation and corrosion of rust on pipes and their connection parts, there is a means for applying so-called peelable paint to these pipes and the like. This strippable paint may be used in a solvent such as vinyl resin or styrene.
It is formed by dissolving coating film forming components such as butadiene-rubber resin. The strippable paint could be peeled off after the various tests on the plant piping were completed and before the final weatherable paint was applied. This strippable paint contains an additive that suppresses adhesion in order to make it easy to peel.

[0005]

However, although the above-mentioned conventional protective tape 1 has a feature that it is easy to peel off, it cannot be stuck to a flange portion or a welded portion of a pipe without a gap, and the winding operation is also difficult. There was a problem that it was complicated. In addition, since this protective tape 1 is expensive, it has a drawback that it cannot be used in large quantities.

[0006] Further, the above-mentioned conventional peelable paint has a feature that it has good adhesion. However, when the standard coating film thickness of the peelable paint is about 30 to 40 µm, it is not possible to expose the paint after one month or more outdoor exposure. There is a problem in that it deteriorates due to solar radiation and cannot be continuously peeled off in a sheet shape at the time of peeling. When the construction period of a plant or the like is long, it has been difficult to apply this strippable paint as a protective measure for piping equipment and the like. Accordingly, the life of the coating film could be extended somewhat by increasing the number of times of application of the peelable paint and increasing the thickness of the coating film. However, it was not a fundamental solution to prevent deterioration from the coating film surface, and an increase in coating film thickness did not improve weather resistance. In addition, there has been a problem that the cost increases as the number of times of application of the peelable paint and the thickness of the coating film increase.

Further, the peelable paint is mainly composed of a vinyl resin as a component for forming a coating film, and contains an additive which suppresses adhesion in order to make the paint easy to peel as described above. In order for the additive to act effectively, it was necessary that the component for forming the coating film of the vinyl resin was solely used. Therefore,
It was not possible to take measures to improve the weather resistance by mixing a pigment having good rust resistance and a good weather resistance into the vinyl resin coating composition.

The present invention has been made to solve such a problem. That is, an object of the present invention is to provide a method for reinforcing the weatherability of a strippable point which can reinforce the weatherability of the strippable point without impairing the strippability of the strippable point. It is in.

[0009]

According to the present invention, a coating film made of a peelable paint (13) is formed on the surface of a workpiece (11, 12), and then the peelable paint (13) is formed. Forming a coating film of aluminum paint (14) on the coating film of (13) to reinforce the weather resistance of the strippable point (13); A reinforcement method is provided. The component for forming the coating of the aluminum paint (14) is the same vinyl resin as the component for forming the coating of the peelable paint (13).

The aluminum paint (1) formed on the peelable paint (13) coating film by the method of the invention described above.
Since the coating film of 4) has weather resistance, long-term weather resistance of one year or more can be maintained. The aluminum paint (14) is used as the lower layer peelable paint (13).
Demonstrates the barrier effect of this strippable paint (13)
Therefore, the peelability, which is the original function of the peelable paint (13), can be maintained for one year or more. The aluminum paint (1)
In the case of the same vinyl-based resin as the component for forming the coating film of 4) and the component for forming the coating film of the point (13), the adhesion is increased, and the weather resistance can be maintained for a long time.

A peelable paint (13) is applied to the surface of the object to be coated (11, 12) so that the coating thickness (t1) becomes about 60 μm, and then the peelable paint (13) is applied. (13)
Aluminum paint (14) on the film thickness of (t)
2) is preferably applied to a thickness of about 15 μm.

The reason why the coating thickness (t1) of the peelable paint (13) is made larger than the coating thickness (t2) of the aluminum paint (14) is that the coating of the pipe (11) or the like is already performed. The peelable paint (13) coating applied to the object is
This is because the solvent of the aluminum paint (14) to be subsequently applied is not dissolved and the strippability of the paint (13) is not reduced. In addition, aluminum paint (1
In 4), even if the coating thickness (t2) is about 15 μm, the weather resistance function can be sufficiently maintained.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In the drawings, common members are denoted by the same reference numerals, and duplicate description is omitted. FIG. 1 is a partial cross-sectional view showing a state where each paint is coated on a pipe by the method for reinforcing the weather resistance of the peelable paint according to the present invention. FIG. 2 is an enlarged cross-sectional view showing a two-layered paint film formed by the method for reinforcing the weatherable paint of the peelable paint of the present invention. In the weather resistance reinforcing method of the present invention, first, a strippable paint 13 for temporarily preventing rust generation and corrosion on a pipe 11 to be coated and a welded portion 12 thereof is applied. This strippable paint 13 can be used, for example, in a solvent such as an aromatic hydrocarbon or an alcohol, with a vinyl resin or styrene.
It is a solution in which components for forming a coating film such as a butadiene-rubber resin are dissolved, and contains an additive that suppresses the adhesion in order to facilitate peeling. This strippable paint 13
After the surface of the object to be coated such as the pipe 11 is washed, the coating operation is performed by general brush coating or spray coating.

Next, an aluminum paint 14 having weather resistance is applied on the paint film of the peelable paint 13. The aluminum paint 14 is a paint in which, for example, flaky aluminum powder is dispersed in a film-forming component of a vinyl resin dissolved in a solvent. This aluminum powder has an effect of blocking ultraviolet rays by reflecting sunlight, an effect of blocking water and the like, and an electrical anticorrosion effect. In addition, the application work of the aluminum paint 14 may be any of general brush coating or spray coating.

The coating film of the aluminum paint 14 is as follows:
Long-term weather resistance of one year or more can be maintained. The aluminum paint 14 exerts a barrier effect on the underlying strippable point 13 so that the strippable point 1
3 is prevented from deteriorating. Therefore, this peelable paint 13
The strippability, which is the original function of, can be maintained for one year or more. After the various tests of the pipe 11 are completed, the peelable paint 13 can be easily peeled off in a sheet shape together with the upper aluminum paint 14 in a sheet form.

If the coating composition of the aluminum paint 14 is the same vinyl resin as the coating composition of the strippable paint 13, the adhesion between the two becomes high and the long-term weather resistance is maintained. can do. In particular, when the solvents are of the same kind, the compatibility with the lower layer peelable paint 13 is improved, and the adhesion is further improved.

The coating thickness t1 of the peelable paint 13 is shown in FIG.
As shown in FIG. 3, an aluminum paint 14 is applied on the coating of the peelable paint 13 so as to have a thickness of about 60 μm.
Is applied so that the coating thickness t2 becomes about 15 μm. The reason why the coating thickness t1 of the peelable paint 13 is made larger than the coating thickness t2 of the aluminum paint 14 is that the coating of the peelable paint 13 already applied to the pipe 11 is applied to the surface thereof. The reason for this is that the solvent of the aluminum paint 14 to be applied is not dissolved and the stripping performance of the paint 13 does not deteriorate. The aluminum paint 14 can sufficiently maintain the weather resistance function even when the coating thickness t2 is about 15 μm.

The present invention is not limited to the above-described embodiment, and any raw material that can be applied to the surface layer of the peelable paint 13 to reinforce the weather resistance can be used as the flake-like material described above. Not limited to the aluminum paint 14 in which the aluminum powder is dispersed, it is possible to use a paint in which other metal powders are dispersed to improve weather resistance,
Therefore, it goes without saying that various changes can be made without departing from the spirit of the present invention. In addition, if the purpose is to temporarily protect the object to be coated from rust and corrosion, not only the piping 11 of the plant but also the metal parts such as window frames and wall surfaces of the building are temporarily protected. In this case, the present invention can be applied.

[0019]

As described above, according to the method for reinforcing the weather resistance of a strippable paint according to the present invention, aluminum paint is applied to a welded portion or the like where stress corrosion cracking is likely to occur on a paint film of the peelable paint. By forming a paint layer having high peelability and weather resistance by dividing the paint layer into two layers, the disadvantage that the coating film deteriorates and cannot be easily peeled off using only the conventional peelable paint.

The aluminum paint layer can maintain its weather resistance even under severer conditions than other colored paints due to light reflection, and can maintain the weather resistance for a long time of one year or more. In particular, if the lower layer has the minimum required coating thickness when the int layer is peeled off, a thin aluminum paint will give this point a weather resistance and maintain the peelability. can do.

Further, when the vinyl-based resins having the same film-forming component as the aluminum paint and the same film-forming component as the peelable paint have the same components, the adhesion between the two is increased, and the long-term weather resistance can be maintained. It has excellent effects such as being able to.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a state in which each paint is coated on a pipe by the method for reinforcing the weatherability of a peelable paint according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a two-layer paint film formed by the method for reinforcing the weatherability of a peelable paint according to the present invention.

FIG. 3 is an enlarged sectional view of a conventional protective tape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Piping 12 Weld part 13 Peelable paint point 14 Aluminum paint t1 Peelable paint film thickness t2 Aluminum paint paint film thickness

Claims (3)

[Claims] 1. A coating film made of a peelable paint (13) is formed on the surface of the object (11, 12), and then an aluminum paint is applied on the paint film of the peelable paint (13). By forming the coating film according to (14),
A method for reinforcing the weather resistance of the peelable int (13), characterized by reinforcing the weather resistance of the peelable int (13). 2. The strippable material according to claim 1, wherein the film forming component of the aluminum paint (14) is the same vinyl resin as the film forming component of the peelable paint (13).方法 Int weather resistance reinforcement method. 3. A peelable paint (13) is applied to the surface of the object to be coated (11, 12) so that the coating thickness (t1) becomes about 60 μm. The weather resistance of the strippable paint (13) is reinforced by applying an aluminum paint (14) on the paint film (13) to a film thickness (t2) of about 15 μm. A method for reinforcing the weather resistance of peelable paint.