JPH11114478A - New method for recovering coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily recover an overly sprayed coating material by installing collecting materials produced by sticking cloth to plates, penetrating the cloth with a coating material from a solvent tank by utilizing capillary phenomenon, and keeping the surface of the cloth in a dampened state. SOLUTION: Solvent tanks 5 are installed above collecting materials 7, water is poured in the solvent tanks 5, the cloth coming out of the upper parts of the collecting materials 7 are immersed in the solvent tanks 5, and a container 6 to receive a coating material flowing down out of the collecting materials 7 is installed under the collecting materials 7. Five collecting materials 7 are used and alternately arranged in two rows in parallel without forming gaps and only three collecting materials 7 in the center are penetrated with a liquid to make the surface of the cloth in a dampened state. After those materials and other components are arranged in such a manner, an article to be coated is coated with a coating material by spray coating continuously for several minutes by a coating apparatus 10 at 25 deg.C in spray coating booth environments. Consequently, the overly sprayed coating material can easily be recovered in the container 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray coating booth used for painting an article, wherein an oversprayed paint can be easily recovered and recovered as it is or as a paint which can be reused with a simple adjustment. The present invention relates to a novel paint recovery method adapted for the purpose.

[0002]

2. Description of the Related Art Conventionally, for the purpose of preventing environmental pollution and the like, a method of collecting oversprayed paint when painting an article has been used. The method is roughly classified into a dry method and a wet method. The dry method is a method of collecting paint that has been oversprayed on an enclosing plate, a filtration filter made of glass wool, nonwoven fabric, paper, or the like. The wet method is a method of collecting a liquid mist such as water or oil, a curtain-like liquid flow, and a paint oversprayed in a recovery liquid tank.

[0003]

However, in the dry method, it is difficult to easily peel off and remove the overspray paint collected on a filter made of a shroud, a glass wool, a nonwoven fabric, a paper, or the like. After being used for a certain period of time, it is common to discard both the filter and the overspray paint without reusing them. However, there is an increase in running costs for replacing filters and the like, and there are environmental problems due to the generation of industrial waste.
In the wet method, overspray paint collected in a liquid mist such as water or oil, a curtain-like liquid stream, or a collection liquid tank is separated into solid and liquid by using an agent called non-adhesive to form a solid overcoat. Although it is common to dispose of spray paint, there are environmental issues associated with industrial waste generation.
In the wet method, a method of condensing the recovered liquid that has collected the overspray paint, regenerating the paint, and reusing it is also performed,
In order to perform concentration, paint adjustment, and the like, a recovery liquid treatment device was required, and it was not easy to recover and reuse the overspray paint. Under such circumstances, there is a need for a method of easily collecting oversprayed paint in a spray painting booth used when painting an article, and collecting the oversprayed paint as it is or as a paint that can be reused with simple adjustment. .

[0004]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have intensively studied a method of recovering paint, and as a result, have found that a filter or a wet dust collector before oversprayed paint is collected. In place of, or instead of a filter or a wet dust collector, a collecting material with a cloth attached to a plate is installed, and liquid is passed from the solvent tank through the cloth using a capillary phenomenon and / or a siphon phenomenon. Was found to be in a wet state, and the overspray paint adhered to the collecting material was found to flow down in the direction of gravity without drying. In addition, a cloth is stuck on the plate and pasted,
By using a collecting material that only the upper part of the cloth protrudes from the plate, by immersing the protruding part of the cloth in the solvent,
It has been found that a capillary phenomenon and / or a siphon phenomenon occur, liquid can be uniformly passed through the entire cloth, and the surface of the collecting material can be kept wet with a small amount of solvent. In addition, by adopting a structure that allows the liquid level of the solvent tank to be changed arbitrarily,
It has been found that a very small flow rate can be accurately controlled.
The appropriate flow rate for paint collection is 0.2 to 5.0 g / min per 0.1 m 2 of plate area of the collecting material.
And preferably 0.5 to 1.5 g. If the amount of liquid passing is less than 0.2 g, the wet state of the cloth surface is small and the paint dries, which is not preferable. If the amount of liquid passing exceeds 5.0 g, the recovered paint is undesirably diluted in a solvent so that a great deal of adjustment is required. There is no particular restriction on the material of the cloth to be stuck on the plate, but a material with less fluff is preferable. When the paint is recovered by the method of the present invention, the trapping material is hardly stained with the paint because it is always wet with the solvent, and since only a small amount of solvent is required,
It has been found that the paint concentration can be efficiently recovered without being diluted too much, and based on these findings, it is easy to collect oversprayed paint in a spray painting booth used when painting articles, The present invention has been completed by finding a novel paint collection method adapted for the purpose of collecting paints that can be reused as they are or with simple adjustment.

That is, the present invention relates to a spray painting booth used for painting an article, in which a filter or a wet dust collector for collecting oversprayed paint is provided before or in place of a filter or a wet dust collector. The present invention relates to a novel paint collecting method characterized in that a collecting material to which a cloth is adhered is installed, and a liquid is passed through the cloth from a solvent tank by utilizing a capillary phenomenon and / or a siphon phenomenon.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The collecting material used in the present invention is most preferably installed in a spray painting booth, but can be installed and used in other places when painting articles. As the spray coating booth, a conventionally known dry type or wet type can be used. In this case, the collecting material must be located behind or on the side of the coated article, as viewed from the coating machine, and in a location that is located in front of the filter or wet dust collector that collects paint in the spray coating booth, It can be installed instead of a filter or a wet dust collector that collects paint in a spray painting booth.

[0007] The trapping material used in the present invention may have any shape,
Any size and any number can be used. These collectors should be installed in front of, or instead of, a filter or wet dust collector that collects oversprayed paint, but especially only where there is a lot of oversprayed paint. You can also. Further, these trapping materials can be fixed with any support.

[0008] The collecting material plate used in the present invention is
Metal products such as iron, aluminum and stainless steel, vinyl chloride,
Any non-water-absorbing material, such as plastic products such as polyethylene and polypropylene, can be used arbitrarily, but a material and thickness that give strength that does not cause distortion in practice are required. Cotton cloth such as gauze and salas, synthetic fiber, etc. can be used as the cloth to be stuck on the plate, but for thick felt, flannel, etc., pass through the liquid to ensure the wet state of the collection material surface The amount is undesirably large.
The preferred fabric thickness is 0.10 to 0.30 mm.

[0009] The trapping material used in the present invention needs to be passed through a solvent, and any solvent can be used as long as it does not affect the paint components. The solvent tank preferably has a structure in which the liquid level of the solvent can be arbitrarily changed, and the solvent is preferably circulated for use. When the solvent is circulated, a fungicide, a preservative, a bactericide and the like can be used as necessary.

The coating used in the present invention can be applied by a coating method such as air spray coating, airless spray coating or electrostatic coating, but can also be applied by a coating method such as shower coating or curtain flow coating. .

As the paint used in the present invention, any paint containing water or an organic solvent can be used. For example, there are alkyd resin paint, acrylic resin paint, polyester resin paint, vinyl resin paint, melamine resin paint, epoxy resin paint, urethane resin paint and the like.

In the present invention, the overspray paint adhering to the trapping material flows down in the direction of gravity, and the overspray paint is collected below the trapping material. Can be installed below the collecting material to collect the overspray paint on the side of the collecting material. It is possible to install a collection tank that stores the paint at a point where the overspray paint flows down in the direction of gravity. The recovered paint can be reused as it is or after adjusting. If adjustment is necessary, depending on the components of the overspray paint, diluents such as hydrocarbons, alcohols, ethers, ketones, esters, ether alcohols, and water, and neutralizers such as amines and acids And other additives can be added, filtered, and reused.

[0013]

Next, the present invention will be described with reference to examples.
The present invention is not limited to these. Collecting Material I FIG. 1 shows the structure of a collecting material obtained by attaching a cloth to a stainless steel plate. The collecting material plate 1 was made of stainless steel having a thickness of 1 mm, a width of 10 cm, and a length of 100 cm, and a double-sided tape 3 was attached to both left and right ends of a back surface thereof, and a fixing bracket 4 was attached. The cloth 2 was attached with a commercially available gauze having a width of 12 cm and a length of 120 cm so as to wrap the entire surface of the plate, and was attached and fixed to a double-sided tape 3 on the back of the plate to obtain a collecting material I having a structure shown in FIG. Collecting material II A collecting material II was obtained in the same manner as the collecting material I except that the cloth was changed to a commercially available silkworm. Collecting material III Collecting material in the same manner as collecting material I except that the fabric is made into a commercial flannel.
III was obtained.

Test Example 1 As shown in FIG. 2, a solvent tank 5 placed above the trapping material 7
And the cloth protruding from the upper part of the collecting material 7 was immersed in the solvent tank 5, and a container 6 for receiving the paint flowing down from the collecting material 7 was arranged below the collecting material 7. Using five collecting materials 7, they were arranged in parallel in two rows as shown in FIG. 3 so that no gap was formed between them, and the liquid was passed only through the three central collecting materials. In a spray coating booth environment at a temperature of 25 ° C., a room temperature dry type water-based rust preventive paint “Overs AW # 550” having a solid content of 50% manufactured by SHINTO PAINT CO., LTD.
A total of 1500 g of paint was applied by air spraying at a rate of 5 minutes per minute for 5 minutes without placing an article to be painted. Thereafter, the container was left for 55 minutes, and the weight of the collected paint collected in the container 6 for receiving the overspray paint placed below the collecting material 7 and the solid content of the collected paint were measured. Also, the stain on the cloth on the surface of the collecting material was observed. In Examples 1 to 6, the trapping materials I and II were used to adjust the flow rate to an arbitrary value. In Comparative Examples 1 to 5, only the trapping materials I and III, gauze and salad were used as the trapping material 7 and adjusted to an arbitrary flow rate. The results are shown in Tables 1 and 2.

[0015]

[Table 1]

[0016]

[Table 2]

Test Example 2 Five collecting materials I were arranged in parallel in two rows as shown in FIG.
The distance between B was adjusted to 20 mm, and the solution was passed through five collection materials.
In a spray coating booth environment at a temperature of 25 ° C., a cold-drying water-based rust-preventive paint “Overs AW # 550” having a solid content of 50% manufactured by Shinto Paint Co., Ltd. is continuously applied at a paint discharge rate of 300 g / min for 30 minutes. A total of 9000 g of paint was applied by air spray without placing the article to be painted. Thereafter, the container was allowed to stand for 30 minutes, and the weight and the solid content of the collected paint collected in the container 6 for receiving the overspray paint placed below the collecting material 7 were measured. Also, the stain on the cloth on the surface of the collecting material was observed. Table 3 shows the results.

[0018]

[Table 3]

As described above, according to the novel paint collection method of the present invention, the oversprayed paint can be easily collected in a spray coating booth used when painting an article, and can be used as it is or with simple adjustment. Paint can be recovered as reusable paint, saving paint.Reduced paint waste eliminates the need for long-term disposal or solid-liquid separation of filters or wet dust collectors in spray painting booths. Clearly, the method is excellent.

[0020]

According to the novel paint recovery method of the present invention,
A new paint collection method adapted to easily collect oversprayed paint in a spray painting booth used when painting articles, and to recover it as it is or as a paint that can be reused with simple adjustment It is suitable as.

[Brief description of the drawings]

FIG. 1 is a schematic view of a collecting material in which a cloth is attached to a stainless steel plate.

2 is immersed in a solvent tank for passing the collecting material of FIG.
It is the schematic which shows the structure which receives the collection | recovery thing which falls down in the saucer receiving container.

FIG. 3 is a schematic view of a spray coating booth in which the collecting material of FIG. 1 is arranged in the configuration of FIG.

[Explanation of symbols]

1 Stainless steel plate (1mm thick, 10c width)
m, length 100 cm) 2 Cloth 3 Double-sided tape 4 Fixing bracket 5 Solvent tank 6 Sauce receiving container 7 Collection material 8 Collection tank 9 Exhaust fan 10 Coating machine

Claims (4)

[Claims] 1. A cloth is applied to a plate in a spray painting booth used for painting an article, in front of a filter or a wet dust collector for collecting oversprayed paint, or instead of a filter or a wet dust collector. It is characterized in that water or an organic solvent (hereinafter, abbreviated as water or organic solvent) is passed through the cloth from the solvent tank by utilizing a capillary phenomenon and / or a siphon phenomenon. Paint collection method. 2. A cloth is stuck on a plate in close contact with the plate,
The use of a trapping material in which only the upper part of the cloth protrudes from the plate is used, the part of the protruding cloth is immersed in a solvent, and the liquid is passed using a capillary phenomenon and / or a siphon phenomenon. 2. The method for collecting paint according to 1. 3. The method for collecting paint according to claim 1, wherein the flow rate is controlled by changing the liquid level of the solvent tank. 4. The paint recovery according to claim 1, wherein 0.2 to 5.0 g of solvent is passed per minute per 0.1 square meter of the plate area of the collecting material. Method.