JPS5850254B2 - Kiyoka Plastics Tsukuno Tosouhouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention was made with the aim of improving the conventional coating method for reinforced plastics, reducing the defective rate of undercoating and topcoating, and drastically reducing the average number of undercoats, thereby lowering product costs. It is something.

Reinforced plastic (hereinafter referred to as FRP).

) has generally been painted using the following steps:

That is, the material (FRP) is cleaned, an amino alkyd resin or urethane resin paint is applied, then the paint film is baked and dried, and if necessary, the dried paint film is touched up, hydroponic, Furthermore, a top coat is applied to this, and the top coat film is baked and dried.

In the undercoating process, as mentioned above, amino alkyd resin paint (
It is customary to use a one-coat method using only urethane resin paint, etc.).

Furthermore, to explain the conventional method with reference to drawings, Figure 1 shows an enlarged cross section of the coating layer according to the conventional method, where 1 is the top coat paint, 2 is the amino alkyd resin or urethane resin paint, and 3 is the material (FRP). 3 shows a model of the coating process in the conventional method.

However, in the conventional method described above, when an aminoalkyd resin paint is used as an undercoat paint, if there is a defect in the material, the defect cannot be completely covered by painting alone, and a rework process is forced.

In addition, if only urethane resin paint is used, defects in the material can be covered to some extent, but the overcoating process lacks sharpness and causes poor appearance, so a rework process is also necessary here. Met.

This touch-up work is quite a tedious work, since baking involves correcting the hardened paint film that has gone through the drying process, which reduces work efficiency and increases costs. leading to up
There was a problem.

In terms of cost, the current situation is that the rework process accounts for over 80% of the total process.

By the way, in place of the conventional one-coat method, a wet-on-wet method (
Hereinafter, it will be referred to as the wow ceremony.

) The purpose of adopting (
The purpose of baking is to increase the film thickness (without increasing the drying process) and compensate for the reduction in film thickness during the subsequent sanding process. .

) was simply a matter of overcoating.

Therefore, even in this case, the above-mentioned problem of requiring a rework process remained.

The present invention was made with the aim of solving such technical problems, and its characteristics are based on the premise of undercoating based on the WOW method, and two types of paints with different characteristics are used in the undercoating. By using the FRP coating and specifying the application order of the two types of paint, we were able to minimize the occurrence of appearance defects (especially craters and pinholes) in FRP painting without the need for rework. be.

That is, the inventors first applied urethane resin paint onto the material (FRP), left it to stand, then further applied amino alkyd resin paint in a wet-on-wet state, top coated it in the same line, and baked it. By drying it, they tried to solve the above-mentioned problems.

Reinforced plastics are molded products made by adding reinforcing agents (glass fibers) to various synthetic resins. Examples of such synthetic resins include unsaturated polyester, epoxy resin, phenolic resin, silicone, and melamine resin. However, the method of the present invention can be practiced without being limited to these types.

Furthermore, to explain the method of the present invention in detail, first of all, the material (FR
P) is washed, and then a urethane resin paint is applied to the material to a thickness of about 15 to 20 microns and left to stand for about 10 to 15 minutes.

Thereafter, an amino alkyd resin paint is further applied in a wet-on-wet state to a thickness of about 15 to 20 μm, and the undercoat film is baked and dried in the same line at about 140° C. for about 30 minutes.

Next, it was decided to use hydroponics, apply a topcoat, and dry before baking.

To explain the method of the present invention with reference to the drawings, Fig. 2 shows an enlarged cross section of a coating layer formed by the method of the present invention. FRP), and 4 indicates an undercoat paint, that is, a urethane resin paint.

FIG. 4 shows the steps of the method of the invention.

Next, a comparison between Examples in which the coating method according to the present invention was applied and the conventional method is shown in the form of a table.

Note: Note 1, Note 2, and Note 3 are based on the conventional coating method, with the average undercoating time being 1 and the cost per product being 10.
01 and the man-hours per product (person/time/1 piece) to 1
The relative value is shown when it is set to 00.

As is clear from the table above, the FRP coating method according to the present invention has the following various effects.

■ Since two types of paints with different characteristics were used in the WOW method painting (undercoat), the paint film formed by the undercoat not only has a different thickness, but also has two types of paints that are involved in its characteristics. Therefore, it is possible to more effectively deal with poor appearance than when using only one type of paint.

■ Amino alkyd resin paint and urethane resin paint are used as the above two types of paint, and
) was first coated with urethane resin paint and then with amino alkyd resin paint, so even if there were some surface defects such as flakes or pinholes on the FRP, the paint could not be applied to the surface defects. filled with
Smoothness is imparted to the FRP surface, and the subsequent amino alkyd resin provides an external finish (sharpness) and adhesion to the top coat that cannot be obtained with urethane resin paint alone. Defects can be suppressed.

■ The above ■ and ■ eliminate the need for rework, so
This leads to a reduction in the number of man-hours required for undercoat painting (approximately % compared to conventional methods), thus contributing to improved work efficiency.

Furthermore, even if the same equipment is used, the capacity of the undercoating process is increased, making it easier to secure the quantity.

■ Since the rework process is also unnecessary, the huge cost required for rework can be completely omitted, thus contributing to a significant cost reduction (approximately % compared to the conventional method).

[Brief explanation of drawings]

Fig. 1 is an enlarged sectional view of a coating layer according to the conventional method, Fig. 2 is an enlarged sectional view of a coating layer according to the present invention, Fig. 3 is a painting process diagram of the conventional method, and Fig. 4 is a coating process according to the present invention. Show the diagram. 1...Top coat paint, 2...Amino alkyd resin undercoat paint, 3...Material, 4...
...Urethane resin undercoat paint.

Claims (1)

[Claims] 1 Apply urethane resin paint as an undercoat to the surface of the reinforced plastic, let it stand, then apply amino alkyd resin paint wet-on-wet, then bake and dry both at the same time, and then apply the desired coating. A method of painting reinforced plastics characterized by applying a top coat.