JPH11300491A - Treatment of coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the exposure, etc., of an operator, etc. and secondary contamination by putting a covering on a coating film removing part, supplying an inert gas into the covering, irradiating the coating film removing part with a laser beam and carbonizing the coating film of the coating film removing part, thereby facilitate the removal thereof. SOLUTION: The covering 3 is first put on the coating film removing part 1. At this time, this part is held in a hermetic state so as not to allow the leakage of the contaminated air. Next, the inert gas 4 is supplied into the covering 3. A pipe 6 or the like capable of supplying gas is previously connected to the covering 3 and is mounted at a gas supply means 7. The inert gas 4 is supplied by this gas supply means 7. At this time, the inside of the covering 3 is recommended to be previously filled with the inert gas 4 by supplying this gas. The coating film 2 is made easily carbonizable in a later stage by the effect of the inert gas 4. Since the inert gas 4 is supplied by the previous stage, the coating film 2 is carbonized without burning if the coating film 2 is irradiated with the laser beam 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a coating material applied to a wall, a floor, a ceiling or the like of a facility for handling radioactivity or a facility for handling poisonous substances so that the coating film can be easily removed. The present invention relates to a coating film processing method for carbonizing the coating film by using the coating film to facilitate the removal of the coating film.

[0002]

2. Description of the Related Art Nuclear facilities such as nuclear power plants and nuclear laboratories, facilities for handling radioactive materials such as hospitals, and facilities for handling chemical poisons are designed to prevent leakage and wear and to increase the durability against chemicals. In many cases, a paint such as an epoxy resin or a urethane resin is applied to a wall or a floor. By the way, when these facilities have been put into service and dismantled, pollutants (fission products, radioactive waste, plutonium,
Radioactive substances, heavy metals and other harmful chemical substances that have a harmful effect on the human body) must be sealed and disposed of so that they do not leak outside. At this time, if the paint applied to the walls and floors can be removed prior to disposal,
The amount of waste contaminated with contaminants can be reduced, and the risk of exposure during operation can be reduced. Conventionally, in order to remove the coating film of the contaminated paint, it has been performed by mechanical polishing / grinding with a machine such as a sander or a sand blast without performing a pretreatment.

[0003]

However, there are some problems in removing the paint film by the above-mentioned mechanical polishing / grinding. First, remove the coating by mechanical polishing and grinding,
In the case where the amount of contaminants is reduced and discarded, there is a risk that workers and the like may be exposed to the fine powder containing the contaminants generated by polishing and grinding, or that secondary contamination may occur.

[0004] In the same case, when mechanical polishing and grinding work is performed, it is necessary to directly contact the tool.
There was a problem that the reaction force was accompanied by vibration and noise.

Therefore, the present invention solves the above problem,
An object of the present invention is to provide a method for treating a coating film, which facilitates removal of a coating film that can prevent exposure of an operator or the like and secondary contamination.

[0006]

Therefore, in order to solve the above-mentioned problem, the present invention provides a method as described in claim 1, wherein a cover is provided on the coating film removing portion and an inert gas is supplied into the cover. Then, a laser beam is applied to the coating removal section to carbonize the coating in the coating removal section, thereby facilitating removal. ] Is provided.

That is, the coating film is formed using an inert gas,
By irradiating and carbonizing with laser light, fine powder containing contaminants is not generated, and it can be removed only by easy work without fear of radioactive diffusion, such as slight chipping and suction, The feature is that the coating film is changed. Another feature is that the danger of exposure due to diffusion of contaminants can be reduced by covering with a cover during laser light irradiation.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the coating film processing method according to the present invention will be described below with reference to the drawings. FIGS. 1A and 1B are cross-sectional views of a coating film removing section according to an embodiment of the coating film processing method of the present invention, wherein FIG. 1A is a first process drawing, and FIG.

[0009] The coating film processing method according to this embodiment comprises:
[The cover 3 is put on the coating removal unit 1, an inert gas 4 is supplied into the cover 3, and the coating film removal unit 1 is irradiated with a laser beam 5 to irradiate the coating 2 of the coating removal unit 1. A coating treatment method that facilitates removal by carbonization. ].

Here, the coating film 2 according to the embodiment mainly means a nuclear power plant, a nuclear-related facility such as a nuclear research laboratory,
Radiation and poison-contaminated paints (mainly epoxy resins, urethane resins) that are applied to the walls, floors, ceilings, and other structures of hospitals and other facilities that handle radioactive substances, facilities that handle heavy metals, toxic substances, etc. Etc.), but the present invention is not limited to the above-described case, and can be applied to the coating film 2 applied to members with various coating materials.

The coating film removing section 1 is a cover 3 described later.
, And is the part that is actually removed. The size varies depending on the size of the cover 3 and the irradiation range of the laser beam 5 described later (the scanning range when scanning with the laser beam 5).

The cover 3 is an inert gas 4 described later.
Is supplied and filled, and the size of the coating film removing unit 1 is determined.
A cover to be used to prevent the diffusion of contaminants after being treated by the present invention. The material is not particularly limited as long as it can seal off the contaminated gas. The shape is not particularly limited as long as the shape can cover the coating removal section 1 in a closed state. Further, the size is appropriate as an irradiation range of the laser beam 5 described later (the range when irradiating and scanning) and a distance between the irradiation port (the tip of the light transmission means 9) and the coating film removing unit 1. The size is not particularly limited as long as the size can cover a desired distance and the size is suitable for filling the inert gas 4 described later.

The inert gas 4 refers to an inert gas in a broad sense, and may be any gas such as argon, carbon dioxide, nitrogen or the like that does not promote the burning of the coating film 2.
The inert gas 4 carbonizes the coating film 2 without burning it, thereby preventing diffusion of a gas containing a pollutant or the like due to the burning. Incidentally, the inert gas 4 is supplied from a gas supply means 7 such as a gas cylinder or a compressor.

The laser light 5 is a coherent light having a uniform phase and wavelength. The laser may be a carbon dioxide laser, a Nd: YAG laser, an iodine laser or any other laser capable of carbonizing the coating film 2. , Can be applied regardless of type. As the laser beam 5, one kind of laser may be used alone, or different kinds of lasers may be used in any combination. The irradiated portion is heated by the thermal energy of the laser light 5, and the coating film 2 is carbonized without burning by the action of the inert gas 4. This laser beam 5
Scanning may be performed while irradiating the coating film 2 in a pinpoint manner. Alternatively, irradiation may be performed using a laser capable of increasing the output power and irradiating a wide range. At this time, the laser beam 5 is irradiated with the laser beam 5 adjusted to an output capable of carbonizing the coating film 2. By the way, if this laser light 5 is oscillated by a laser oscillator 8 and transmitted by an optical transmission means 9 such as an optical fiber to a place to be irradiated,
Remote control is also possible.

In the coating film processing method according to this embodiment, the cover 3 is placed on the coating film removing section 1 and the inert gas 4
And a second step of irradiating the coating film 2 of the coating film removing section 1 with the laser beam 5 to carbonize and process the coating.

In the first step, as shown in FIG. 1A, the cover 3 is placed on the coating film removing section 1 and the inert gas 4 is covered.
Is supplied by gas supply means 7 such as a gas cylinder or a compressor. First, the cover 3 is put on the coating film removing unit 1. At this time, a sealed state is kept so that the contaminated gas does not leak. Next, the inert gas 4 is supplied into the cover 3. A gas pipe 6 or the like capable of supplying a gas is connected to the cover 3 in advance, which is attached to a gas supply means 7, and the inert gas 4 is supplied by the gas supply means 7. At this time, the inert gas 4
Is supplied, the cover 3 is preferably filled. This is because the coating gas 2 is easily carbonized in the second step described later by the action of the inert gas 4.

In the second step, as shown in FIG. 1B, the laser beam 5 is applied to the coating film 2 of the coating film removing section 1 and carbonized by the heat. Since the inert gas 4 is supplied in the first step, when the coating film 2 is irradiated with the laser beam 5, the coating film 2 is carbonized without burning. The laser beam 5 may be transmitted and radiated from a laser oscillator 8 using an optical transmission unit 9 such as an optical fiber with an output capable of carbonizing the coating film 2. As described above, the laser beam that can be irradiated over a wide range may be used, or the laser beam that can be scanned while being irradiated in a pinpoint manner may be used. Further, at this time, if means for collecting gas or solid generated when the coating film 2 is carbonized is provided, safety is improved. For example, a discharge port is provided in the cover 3, and a filtering means 10 such as a filter is provided therein, and the exhaust gas after carbonization of the coating film 2 is sucked by the suction means 11 through the filtering means 10. ,
You only have to discharge. However, this is not an essential means for carrying out the present invention, and even without this, by carbonizing the coating film 2, the contaminants can be easily removed, and In the removal operation, diffusion can be prevented.

[0018]

As described above, by using the method of the present invention, the coating film is carbonized using a laser beam to facilitate the removal of the coating film. In addition, since the vaporized radioactive substance is not diffused by covering with the cover, it is possible to prevent exposure of workers and the like and secondary contamination.

Furthermore, since this coating film processing method is a method for facilitating the removal of the coating film by laser irradiation, it is possible to prevent the occurrence of remarkable vibration and noise without mechanical polishing at the time of removal. .

Further, since the coating film can be removed by remote control, it is possible to reduce the exposure of the worker to the exposure.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a coating film removing unit according to an embodiment of a coating film processing method of the present invention, wherein (a) is a first process diagram,
(B) is a 2nd process drawing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coating removal part 2 Coating 3 Cover 4 Inert gas 5 Laser light 6 Gas pipe 7 Gas supply means 8 Laser oscillator 9 Optical transmission means 10 Filtration means 11 Suction means

Claims (1)

[Claims] 1. A cover is placed on a coating removal section, an inert gas is supplied into the cover, a laser beam is applied to the coating removal section, and the coating on the coating removal section is carbonized and removed. Coating treatment method that facilitates