JP3006283U - Hanger for painting - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a method for using a hanger used for electrodeposition coating or electrostatic coating without removing the coating film after coating. [Structure] A hanger is made or coated with a mixture of a polytetrafluoroethylene resin and a metal.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is used for coating methods by applying electricity to the object to be treated, such as electrodeposition coating, and coating methods that use electrostatic electricity to improve coating efficiency, such as electrostatic coating. It is about hangers.

[0002]

[Prior art]

 Electrodeposition coating is a coating method in which a positive or negative voltage is applied to an object to be processed, and a paint resin charged to a potential opposite to that of the object is applied by electrophoresis. When applying a voltage to the object to be coated, a current collector is attached to a part of the hanger that is insulated from the transport device, and a voltage is applied to the current collector so that the object to be coated reaches a predetermined voltage through the hanger. Has become.

The hanger for suspending the article to be coated enters the electrodeposition paint tank together with the article to be coated during electrodeposition, and the hanger is also coated. The hanger and the object to be coated are required to have electrical conductivity, and the coating film such as electrodeposition paint is a non-conductor, so that the hanger used once will ensure the electrical conductivity of the contact point with the object to be coated the next time it is used. , Could not be used unless the electrodeposition coating film was peeled off or polished.

The electrostatic coating is a coating method devised so that the coating material is electrostatically charged when spraying powder or solvent coating material so that the coating material efficiently adheres to the object to be coated. The object to be coated is grounded through a hanger and a carrier so as not to be charged. The paint adheres to the hanger even when electrostatically applied. The hanger to which the paint adheres is insulated by the coating film, and when electrostatic coating is applied, the object to be coated becomes charged and the coating efficiency due to static electricity decreases. For this reason, it is essential to periodically remove the coating film from the coating hanger even in electrostatic coating.

[Problems to be solved by the device]

First of all, the drawbacks of the conventional coating method are that the hanger used once peels off the coating film adhered to the hanger with a coating film peeling agent or scrapes the coating film with a sander to expose the base metal of the hanger. Therefore, it is necessary to ensure the electrical conductivity. Many of the paint film release agents use a chlorine-based solvent, which is environmentally problematic. Polishing the hanger with a sander was not economical because the hanger was partially consumed by the polishing and it was necessary to renew the hanger regularly. Also, peeling the hanger was not efficient because it increased the production process.

[Means for solving the problem]

In order to solve the above problems, the present inventor has conducted extensive studies and, as a result, solves this problem by using polytetrafluoroethylene (PTFE) having conductivity to a hanger. Came to.

The PTFE resin is typified by a tetrafluoroethylene resin, which is a resin excellent in heat resistance, chemical resistance, and water / oil repellency, but at the same time has a high insulating property. However, in recent years, products having such a resin mixed with a metal and having electrical conductivity have appeared.

The inventor of the present invention used this electrically conductive PTFE resin as a coating hanger or by coating the contact between the hanger and the object to be coated.

[0009] Here, when the PTFE resin having electric conductivity is described, for example, a mixture of a tetrafluoroethylene resin and lead can be mentioned. Examples of commercially available products coated with copper include DRYSTAR F-920 (product of NDC Corporation). This Drystar F-920 was developed as a bearing material. However, in the present invention, not only lead but also any metal such as tin, copper or nickel may be mixed as the metal for considering the electric conductivity.

These metals may be mixed in any amount as long as PTFE is formed into a film as a fine powder and conductivity is imparted.

[Action]

If electrodeposition coating is performed with a hanger that uses a conductive PTFE resin or that covers the contact point with the object to be coated, voltage is normally applied to the object to be coated due to its conductivity. Due to the water- and oil-repellent effect, the contact part does not form an electrodeposition coating film at all, or even if it is formed, it can be easily wiped off. Since the resin has high heat resistance, there is no deformation and deterioration even during baking, and it can be used for a long time.

[0012] Even in electrostatic coating, since there is electrical conductivity, the object to be coated is not charged, and due to the water and oil repellency effect, the coating does not adhere to the resin part. It can be used.

[Example 1]

A hanger in which a contact point with an object to be coated is covered with a lead tetrafluoride ethylene resin Dry Star F-920 (product of NDC Corporation) is prepared, and a cleaned object to be coated with steel is hung on the hanger. It was electrodeposited. The electrodeposition coating was acrylic cation electrodeposition coating Saxade 1000 manufactured by Shinto Paint Co., Ltd., and electricity was applied for 2 minutes and 30 seconds at 200 V in a coating bath at 28 ° C. After electrodeposition coating, it was washed with water and then baked at 170 ° C. for 25 minutes to form a coating film.

When the hanger was examined after the above treatment, no paint was attached. Therefore, the hanger was repeatedly subjected to electrodeposition coating 20 times without any treatment. A normal coating film could be formed without any problems in these 20 repeated electrodeposition coatings.

Example 2

Similarly, an article to be coated was hung by a hanger (the same as in Example 1) coated with a tetrafluoroethylene resin mixed with lead, and electrostatic coating was performed. As a coating apparatus, a microbell manufactured by Randsburg Industry Co., Ltd. was used to apply acrylic solvent paint Akroze 6000 manufactured by Dainippon Paint Co., Ltd. by applying a negative electrostatic voltage of 70 KV, and baking was performed at 150 ° C. for 20 minutes.

When the hanger after painting was examined, almost no paint adhesion was observed, and even a slight amount of paint did not have adhesion to the water / oil repellent resin, so it could be easily removed by rubbing it by hand. there were. This hanger was used for 20 times of repeated coating, but it was possible to electrostatically paint without any problem by simply rubbing and removing the slightly adhered paint when hanging the object to be coated.

【The invention's effect】

As described in the above embodiments, by using the hanger of the present invention, it is not necessary to remove the coating film of the hanger after painting, the production process can be shortened, and the release agent is not used. It is economical because the hanger can be used for a long period without any problems.

[Brief description of drawings]

FIG. 1 is an enlarged view of a portion of the steel coating hanger that comes into contact with the object to be coated (hook portion) covered with a conductive PTFE resin. The hook portion is connected to the hanger body with a screw. It is an example. Although FIG. 2 is shown for the purpose of explanation, it shows the shape of a commonly used hanger that is usually used.
It may be formed of a mixture of a metal and a metal, or may be a base material of which steel is used and which is coated with a mixture of PTFE and a metal. Further, as shown in FIG. 2, only the contact portion with the object to be coated may be coated.

[Explanation of symbols]

 1. Hanger hook 2. Hanger part that connects to the hook part 3. Screw 4. Hook part to trolley conveyor etc.

Claims (2)

[Scope of utility model registration request] 1. A coating hanger that uses a mixture of a polytetrafluoroethylene resin and a metal as a coating hanger for coating while coating an object to be energized or discharging the object. 2. A coating system for coating an object to be coated with electricity.
Alternatively, a coating hanger for coating a coating-type coating hanger that coats an object while discharging it with a coating of a mixture of a polytetraloloethylene resin and a metal.