JPH0910637A - Masking material for coating and its method - Google Patents

Abstract

PURPOSE: To facilitate working and to apply different paints precisely separate from one another by covering a masking part on a region wherein a single-layer coating film is formed at a specified distance from the surface of a work. CONSTITUTION: This masking material 10 is integrally formed into a bottomed cylinder having a fitting hole 11 in a center with an elastic high molecular material resistant to heat and chemicals such as silicone rubber. The hole 11 has an inner diameter to fit to a part P to be coated and a length corresponding to the part P, the inner diameter is gradually decreased toward an open end, and further an expanded hole 12 is formed in the open end of the hole 11. The expanded hole 12 has an inner diameter larger than the outer diameter of the part P and a length corresponding to the intermediate part Pb of the part P, and an annular masking part 13 is formed on an outer periphery. The masking material 10 is fit to the part P and positioned at a position corresponding to the coating film forming regions Pa to Pc of the respective colors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention sequentially sprays two kinds of paints having different viscosities onto the surface of a work to form a single-layer coating film of a low-viscosity paint and two kinds of paints on the surface of the work. The present invention relates to a coating method for forming a laminated multilayer coating film and a coating masking material applied by this coating method.

[0002]

2. Description of the Related Art For example, in a fuel tank T mounted on a four-wheeled vehicle as shown in FIG. 8, a chipping-resistant coating film is formed on the outer surface of the fuel tank T by coating a high-viscosity coating material called an undercoat, The rust preventive coating film is formed on the outer surface of the tank body by coating with a low-viscosity coating material called a shower coat. Regarding the inlet pipe P for refueling the inside of the tank body TH, the above-mentioned 2 It is necessary to paint different types of paint. That is, as shown in FIG. 7, although the hose H is usually fitted to the outer periphery of the middle portion Pb of the inlet pipe P,
Since only the rust preventive coating film B formed by the shower coat is formed, there is a risk of being partially exposed to the outside air, while the base end portion Pc of the inlet pipe P is directly exposed to the outside air and collides with an object such as a stone bounce. Therefore, it is necessary to form a rust preventive coating B by a shower coat and a chipping-resistant coating A by an undercoat. The tip portion Pa of the inlet pipe P may be in contact with fuel such as gasoline which may be a solvent. Therefore, in order to prevent the coating film from being dissolved by the fuel, it is usually applied with the above two kinds of paints. No film is formed.

FIG. 9 exemplifies a conventional coating method in which the fuel tank T for a four-wheeled vehicle is to be coated.

In this coating method, as shown in FIG. 9 (a), first, a cap C is put on the tip portion Pa of the inlet pipe P on which no coating film is formed, and then as shown in FIG. 9 (b). A masking tape M is attached to the intermediate portion Pb of the inlet pipe P that forms only the rust preventive coating film B by the shower coat.

Next, as shown in FIG. 9 (c), a chipping-resistant coating film A is formed on the entire fuel tank T by undercoating.

After the undercoat is finished, as shown in FIG. 9 (d), the inlet pipe P to the masking tape M is removed.
Only peel off and then, as shown in FIG. 9 (e),
A rust preventive coating film B is formed on the entire fuel tank T by shower coating.

When the cap C is removed from the inlet pipe P after the shower coat is finished, a fuel tank T in which the inlet pipe P is separately painted in the above-described manner can be obtained as shown in FIG. 9 (f). .

[0008]

By the way, in the above-mentioned coating method, it is indispensable to attach / detach the masking tape M to / from the inlet pipe P each time. Moreover, when the masking tape M is attached, the inlet pipe P must be accurately attached. Since it is necessary to surely perform the work at the position, the work is considerably complicated.

In view of the above situation, an object of the present invention is to provide a masking material for coating and a coating method capable of accurately coating two kinds of coating materials having different viscosities without complicating the work. To do.

[0010]

A masking material for coating according to the present invention is a single-layer coating of a low-viscosity coating only on a surface of a work by sequentially spraying two types of coatings having different viscosities on the surface of the work. A masking material for coating used when forming a film and a multi-layer coating film in which these two kinds of coating materials are laminated, in a region where the single-layer coating film is formed in a mode having a predetermined gap from the surface of the work. It has a masking part to cover it.

In the coating method according to the present invention, two kinds of coating materials having different viscosities are sequentially sprayed onto the surface of the work,
A single-layer coating film containing only low-viscosity paint on the surface of the work and these 2
In a coating method for forming a multi-layer coating film in which different types of coating materials are laminated, the single-layer coating film is formed on the surface of the work with a predetermined gap secured before spraying the two types of coating materials. The step of covering the area with a masking portion is included.

[0012]

According to the above construction, only the invasion of the high-viscosity paint into the area where the single-layer coating film is formed can be restricted by the masking portion.

Further, according to the above construction, before the spray of the coating material, only the invasion of the high-viscosity coating material into the area where the single-layer coating film is formed is restricted by the masking portion.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing an embodiment. 2 and 3 conceptually show a masking material for coating according to the present invention. The coating masking material 10 illustrated here uses four high-viscosity undercoat paints A'and low-viscosity shower coat paints B'as shown in FIG. When the inlet pipes P of the fuel tank T mounted on the automobile are separately painted in the manner shown in FIG. 7, that is, only the rust preventive coating film B by the shower coat is formed on the intermediate portion Pb of the inlet pipe P, while the inlet pipe P is formed. A rust preventive coating B by a shower coat and a chipping-resistant coating A by an undercoat are formed on the base end portion Pc of the above, and the tip portion Pa of the inlet pipe P is covered with the above-mentioned 2
1 illustrates a coating masking material 10 applied when the coating films of different types of coating materials are applied separately in a mode in which none of them is formed.

As shown in FIGS. 2 and 3, the masking material 10 has a fitting hole 11 in the center and has a substantially bottomed cylindrical shape with one end face closed, and is made of silicon rubber or the like. It is integrally molded with an elastic polymer material that has heat and chemical resistance. The fitting hole 11 has an inner diameter that fits into the inlet pipe P of the fuel tank T and has a length corresponding to the tip end portion Pa of the inlet pipe P. The inner diameter gradually increases toward the open end. It extends in a very slightly reduced manner.

Further, in the masking material 10, an expanding hole 12 is formed and arranged at the open end of the fitting hole 11. The expansion hole 12 has an inner diameter sufficiently larger than the outer diameter of the inlet pipe P and has a length corresponding to the intermediate portion Pb of the inlet pipe P, and an annular masking is provided on the outer periphery thereof. It constitutes part 13.

The masking material 10 has a maximum outer diameter at a portion corresponding to a meeting portion between the fitting hole 11 and the expansion hole 12, and a portion having the maximum outer diameter is provided at both ends. The outer diameter is gradually decreasing toward.

When the fuel tank T is coated by applying the masking material 10 constructed as described above,
As shown in (a), first, the masking material 10 is fitted to the inlet pipe P of the fuel tank T which has been appropriately pretreated such as chemical conversion treatment. At this time, as shown in FIG. 1B, the fitting hole 11 of the masking material 10 is appropriately deformed, so that the flange portion Ph having a large diameter formed at the tip of the inlet pipe P and the two kinds of paints are formed. Tip portion P of the inlet pipe P that does not form any coating film
Each of a is fitted and accommodated without a gap. Also,
The masking portion 13 of the masking material 10 covers the entire outer circumference of the intermediate portion Pb of the inlet pipe P where only the rust preventive coating film B formed by the shower coat is formed, with an appropriate gap t secured from the outer surface thereof. Become.

When it is confirmed that the masking material 10 is securely fitted to the inlet pipe P in the above-mentioned manner,
As shown in FIG. 1 (b), spraying of the undercoat paint A'onto the fuel tank T is started, and the chipping-resistant coating film A of about 500 .mu.m is formed on the outer surface of the fuel tank T.
To form At this time, the undercoat paint A ′ is
As described above, the viscosity is sufficiently high, the particles when atomized become relatively large, and the fluidity after adhesion is poor. Therefore, as shown in FIG. 5, only the portion not covered with the masking material 10 is used. That is, it adheres only to the outer surface of the tank body TH and the base end portion Pc of the inlet pipe P. At that time, when the nozzle NA for spraying the undercoat paint A ′ is arranged on the tip side of the inlet pipe P and its spray port is directed to the tank body TH, the inlet pipe P and the masking portion 13 are separated from each other. Since it is possible to reliably prevent the undercoat paint A ′ from entering the gap t defined between them, it is possible to form a clear parting line between the intermediate portion Pb of the inlet pipe P. .

After the spraying of the undercoat paint A'is completed, after a suitable drying time, as shown in FIG. 1 (c), the nozzle NB is kept in a state in which the masking material 10 is still fitted to the inlet pipe P. From the above, the shower coat paint B'is sprayed onto the fuel tank T to form an anticorrosive coating film B of several μm on the outer surface of the fuel tank T. At this time, the shower coat paint B ', like the undercoat paint A', adheres to the portion not covered with the masking material 10, that is, the outer surface of the tank body TH and the base end portion Pc of the inlet pipe P. Anti-corrosion coating B
As described above, since the viscosity is sufficiently low, the particles when atomized are relatively small, and the fluidity after adhesion is high, the masking portion 13 is formed as shown in FIG. The intermediate portion Pb of the inlet pipe P covered by is also intruded and adhered through the gap t to form the rust preventive coating film B. Since the masking material 10 is fitted to the tip end portion Pa of the inlet pipe P without any gap, the shower coat paint B ′ is used.
Will never invade.

After the spraying of the shower coat paint B'is completed, the masking material 10 is removed from the inlet pipe P after the drying time, as shown in FIG. It is possible to obtain the fuel tank T which is separately painted in the mode shown in FIG. 7.

Moreover, during these periods, the operator only has to attach and detach the masking material 10 to and from the inlet pipe P only once, so that the painting work becomes extremely easy.

In the above embodiments, the masking material for coating and the coating method applied when the columnar inlet pipes are separately coated in the fuel tank are illustrated. However, the present invention is not limited to this and, for example, a flat plate. It can also be applied to the case where the outer surface of is separately painted. Further, although the high-viscosity paint is sprayed and then the low-viscosity paint is applied repeatedly, the order of spraying the paint may be reversed. Further, although only the high-viscosity paint and the low-viscosity paint are sprayed, the coating film formed by spraying these paints may be further coated.

In the above embodiment, the entire masking material is formed of an elastic polymer material having heat resistance and chemical resistance such as silicon rubber, but the present invention is not limited to this. For example, in the case where the columnar portions are separately coated as in the embodiment, only the periphery of the fitting hole is molded with the elastic polymer material such as silicon rubber described above, and the other portions are molded with metal or another rigid body. Alternatively, when the flat plate-shaped ones are separately coated, the same effect can be expected even if they are all made of metal or another rigid body.

[0025]

As described above, according to the coating material masking material of the present invention, since only the high-viscosity coating material can be restricted by the masking portion to the area where the single-layer coating film is formed, After that, it becomes possible to spray two kinds of paints one after another in that state, and it is possible to accurately paint two kinds of paints having different viscosities without complicating the work.

Further, according to the coating method of the present invention, before the paint is sprayed, only the invasion of the high-viscosity paint into the area where the single-layer coating film is formed is restricted by the masking portion. The two kinds of paints can be sprayed successively in the state as it is, and the two kinds of paints having different viscosities can be accurately applied separately without complicating the work.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a coating method to which a coating masking material according to the present invention is applied.

FIG. 2 is an enlarged cross-sectional view of the coating masking material shown in FIG.

FIG. 3 is an arrow view III in FIG.

FIG. 4 is a table showing components of a paint applied by the coating method of FIG.

FIG. 5 is an enlarged view of a main part showing the step of FIG.

FIG. 6 is an enlarged view of an essential part showing the step of FIG.

FIG. 7 is a view conceptually showing a main part of a fuel tank which is a coating object of the embodiment shown in FIG.

FIG. 8 is a perspective view conceptually showing a fuel tank to be coated in the embodiment shown in FIG.

FIG. 9 is a conceptual diagram showing a coating method to which a conventional masking material for coating is applied.

[Explanation of symbols]

 10 ... Masking material 13 ... Masking portion A ... Chipping resistant coating A '... Undercoat coating B ... Rust-preventing coating B' ... Shower coating coating P ... Inlet pipe Pa ... Tip portion Pb ... Intermediate portion Pc ... Base end Part T ... Fuel tank t ... Gap TH ... Tank body

Claims (2)

[Claims] 1. A single-layer coating film of only low-viscosity coating material and a multilayer coating film in which these two types of coating materials are laminated on the surface of a work by sequentially spraying two kinds of coating materials having different viscosities. A masking material for coating used when forming a coating, comprising a masking portion that covers the area where the single-layer coating film is to be formed from the surface of the work with a predetermined gap. Masking material. 2. A single-layer coating film of only low-viscosity coating material and a multilayer coating film in which these two types of coating materials are laminated on the surface of the work by successively spraying two kinds of coating materials having different viscosities on the surface of the work. A method of forming a coating layer, the method comprising the step of covering a region of the surface of the workpiece on which the single-layer coating film is to be formed with a masking portion before spraying the two types of coating materials. Coating method characterized by.