JP2003275667A - Method of recovering aqueous coating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of recovering an aqueous coating which can easily recover oversprayed coating and reuse the recovered coating as it is or after simple adjustment. <P>SOLUTION: In this method of recovering the aqueous coating, a plate-like collection material which collects the oversprayed coating and over which a liquid material flows from above is installed, and the aqueous coating, together with the flowing liquid material, is recovered without sticking the aqueous coating to the collection material. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recovering an oversprayed paint which can be easily recovered and reused as it is or as a paint by simple adjustment.

[0002]

2. Description of the Related Art Conventionally, for the purpose of preventing environmental pollution, saving resources by recycling, etc., oversprayed paints are collected when painting articles. The recovery method is roughly classified into a dry method and a wet method. The dry method is a method of collecting the oversprayed coating material on a filtration filter made of an enclosure plate, glass wool, nonwoven fabric, paper or the like. The wet method is a method in which liquid mist such as water or oil, a curtain-shaped liquid flow, and a coating liquid oversprayed in a recovery liquid tank or the like are collected.

However, in the dry method, it is difficult to peel off the overspray paint collected on the enclosure plate and the filtration filter made of glass wool, non-woven fabric, paper or the like. It is general that both the filtration filter and the overspray paint are discarded without being reused, and there are problems such as an increase in running cost for the replacement filter and environmental pollution due to industrial waste generation. In the wet method, liquid mist such as water or oil, curtain-shaped liquid flow, overspray paint collected in a recovery liquid tank, etc. is solid-liquid separated using a chemical called a non-sticking agent, and then solidified and discarded. However, there is a problem of environmental pollution due to industrial waste generation. Further, in the wet method, the recovered liquid in which the overspray paint is collected is concentrated to regenerate the paint and reuse it, but concentration and adjustment of the paint at that time are not easy.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for recovering a water-based paint which allows the oversprayed paint to be easily recovered and reused as it is or as a paint with simple adjustment.

[0005]

According to the present invention, a plate-shaped collecting material through which a liquid material flows is installed over the entire surface from the upper portion for collecting the oversprayed water-based coating material, and the water-based coating material is applied to the collection material. There is provided a method for recovering an aqueous paint, which is characterized in that it is recovered together with a flowing liquid substance without being attached.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below.

In order to solve the above problems, the present inventors have
As a result of diligent study, for the collecting material that collects the oversprayed water-based paint, by flowing the liquid material over the entire surface from the upper part, and collecting the paint together with the flowing liquid material, below the collecting material, The present invention has been completed based on the finding that it can be recovered as a paint in a reusable state as it is or by simple adjustment.

The collecting material used in the present invention is preferably installed in a spray coating booth, but it can also be installed and used in other places when the article is coated. The collection material needs to be placed in front of a filter or a wet dust collector that collects the oversprayed water-based paint.

As the trapping material used in the present invention, a plastic material such as vinyl chloride resin or acrylic resin can be used.

The collecting material used in the present invention is provided with a pipe having a keyhole or a slit-like hole, and at least one selected from the pure water used for the water-based paint and the additive is installed from the pipe. A pipe adjusted so that the contained liquid substance flows out and flows in a minimum amount necessary to completely cover the entire surface of the collecting material is attached.

The shape of the trapping material used in the present invention is plate-like, and may be of any size as long as it can be put in the coating booth. The distance from the floor surface is preferably about 0 to 200 mm. Further, it is preferable to install a U-shaped or V-shaped collecting device having a shape like a rain gutter under the trapping material.

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

The paint used in the present invention may be a water-based paint such as a water-soluble paint or a water-dispersed paint, and any paint containing water may be used. Specifically, alkyd resin paints, acrylic resin paints, polyester resin paints,
Examples thereof include vinyl resin type paints, melamine resin type paints, epoxy resin type paints and urethane resin type paints.

In the present invention, the liquid material is flown on the collecting material, and the overspray coating material flows down vertically along with the flowing liquid material, and the overspray coating material is recovered below the collecting material. It is also possible to install a collecting material or a material such as a vinyl sheet which does not easily adsorb the coating material, and collect the overspray paint on the side of the collecting material. A recovery tank can be installed to store the paint at the end where the overspray paint has flown down in the vertical direction. The recovered paint can be reused as it is or after being adjusted. When adjustment is necessary, depending on the constituents of the overspray paint, for example, a diluent such as water, a neutralizing agent such as amines and acids, a solvent such as alcohol, glycol, and cellosolve, and other additions. Agents and the like can be added, mixed, filtered, and reused.

[0015]

EXAMPLES The present invention will be described in more detail with reference to specific examples.

<Example> A vinyl chloride plate collecting material is arranged in front of a dry spray coating booth, and above the collecting material,
As shown in FIG. 1, pure water was sprayed from the pipe-shaped material so that the entire surface of the trapping material was covered with water. Further, an overspray paint recovery container was installed below the trapping material. After that, TECHNON # 200 (trade name of Dainippon Paint Co., Ltd .: diluted to 40% with NV = 50% coating efficiency)
Was applied at a coating amount of 300 g / min for 3 hours. The results are shown in Table 1.

<Comparative Example> Coating was carried out in the same manner as in the example except that the pipe-like material for spraying pure water was not attached to the collecting material. The results are shown in Table 1.

[0018]

[Table 1]

[0019]

As described above, according to the present invention,
A method for recovering water-based paint that is applied for the purpose of easily recovering oversprayed paint in a spray painting booth used when painting an article and recovering it as it is or as a paint that can be reused by simple adjustment. Is suitable as

[Brief description of drawings]

FIG. 1 is a diagram showing a method of collecting an aqueous paint by a collecting material and piping of the present invention.

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Claims (3)

[Claims] 1. A plate-shaped collecting material for flowing a liquid material over the entire surface from an upper portion for collecting the oversprayed water-based coating material, and a flowing liquid liquid without adhering the water-based coating material to the collection material. A method for recovering a water-based paint, characterized in that it is recovered together with the material. 2. A pipe having a keyhole or a slit-like hole is installed above the plate-shaped collecting material, and the liquid substance is caused to flow out from the pipe so as to cover the entire surface of the collecting material. The method for collecting water-based paint as described in. 3. The method for recovering a water-based paint according to claim 1, wherein the liquid material contains at least one selected from pure water used for the water-based paint and an additive.