JPH11276952A - Method and device for recovering water based coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recovering method and recovering device for water based coating material by which oversprayed coating material is easily recovered and the recovered coating material can be reused as it is or after simple adjustment in a spray coating booth used when an article is coated. SOLUTION: In this recovering method, on this side of a filter or a wet type dust collector for collecting the oversprayed water based coating material, a plate like, pipe like, or string like collecting material having a hydrophilic function of 70 deg. or less contact angle or consisting of a coated material coated so that it has 70 deg. or less contact angle is arranged in the shape of a reed screen to stick the water based coating material on the collecting material to recover it. In the recovering device, on this side of a filter or a wet type dust collector for collecting oversprayed water based coating material, a plate like, pipe like, or string like collecting material having a hydrophilic function of 70 deg. or less contact angle or consisting of a coated material coated so that it has 70 deg. or less contact angle is arranged in the shape of the reed screen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for recovering an aqueous paint which can easily collect oversprayed paint and reuse it as it is or with a simple adjustment.

[0002]

2. Description of the Related Art For the purpose of preventing environmental pollution and saving resources by recycling, paints that have been oversprayed when painting articles have been collected. The collection method is
The dry method is broadly classified into a dry method and a wet method. The dry method is a method of collecting paint that has been oversprayed on an enclosure plate, a 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 remove and remove the overspray paint collected on a filter plate made of a shroud, glass wool, nonwoven fabric, 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.
There is a problem of 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.
In general, solid-liquid separation is carried out using a drug called an anti-adhesive agent, and the solid state is discarded. There is a problem of environmental pollution due to the generation of industrial waste. In the wet method, the recovered liquid that has collected the overspray paint is concentrated to regenerate the paint and reused.
Paint preparation was not easy. Under such circumstances, there has been a demand for a method and an apparatus for collecting a water-based paint which can easily collect oversprayed paint and reuse it as it is or with simple adjustment.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, before the filter or the wet dust collector that collects the oversprayed water-based paint, water has been removed. By arranging a plate-shaped, pipe-shaped or string-shaped collecting material made of a material having a contact angle of 70 ° or less or a material coated so that the contact angle is 70 ° or less in an interdigital shape, Completed the present invention by finding that the paint adhered to the trapping material, and the paint that had adhered flowed down in the direction of gravity. did.

That is, according to the present invention, a material having a hydrophilic function having a contact angle with water of 70 ° or less or a contact angle of 70 ° or less is provided before a filter or a wet dust collector that collects oversprayed water-based paint. A plate-like, pipe-like or string-like collecting material made of a material coated as described above is arranged in a blind shape, and a water-based paint is attached to the collecting material and collected. It is a collection method.

Further, the present invention provides a material having a hydrophilic function having a contact angle with water of 70 ° or less or a contact angle of 70 ° or less before a filter or a wet dust collector for collecting oversprayed water-based paint. This is a water-based paint collecting apparatus characterized in that a plate-like, pipe-like or string-like collecting material made of a material coated as described above is arranged in a blind shape.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The collecting material used in the present invention is preferably installed in a spray painting booth, but can be used in other places. The collecting material must be installed in front of a filter or a wet dust collector that collects the oversprayed water-based paint.

The trapping material used in the present invention is made of a material having a hydrophilic function having a contact angle with water of 70 ° or less or a material coated so as to have a contact angle of 70 ° or less. It is pipe-shaped or cord-shaped. The collecting material is arranged in a screen. Further, it is preferable that the blinds of the trapping material are arranged in two or more rows at intervals.

The material having a hydrophilic function having a contact angle of 70 ° or less is not particularly limited, and may be iron, aluminum, copper,
Metal materials such as stainless steel, plastic, glass,
Materials such as ceramics are exemplified. Furthermore, the contact angle 7
Examples of the material coated so as to have a contact angle of 0 ° or less include a material having a contact angle of 70 ° or less by various plating treatments or painting.

[0010] A device capable of atomizing a solution or a pipe having a key hole or a slit-like hole is installed above the trapping material used in the present invention. A solution that does not adversely affect the paint, such as an agent, is allowed to flow from the hole to the collecting material in a minimum amount necessary for the recovery of the paint.

The shape of the trapping material used in the present invention is 1 to 4
A plate having a size of about 00 × 1,000 to 3,000 mm is preferable.
0 mm is preferred. Further, the blinds of the trapping material are preferably arranged in two or more rows at intervals, and the front row is spaced from the floor by 0 to 200 mm, and the second and subsequent rows are spaced from the floor by 200 to 200 mm. 500 mm is preferred. Further, it is preferable to provide a U-shaped or V-shaped rain gutter-shaped collection path below the trapping material.

The coating method used in the present invention includes coating methods such as air spray coating, airless spray coating, and electrostatic coating, and coating methods such as shower coating and curtain flow coating.

As the paint used in the present invention, any water-based paint such as a water-soluble paint or a water-dispersible paint can be used. For example, alkyd resin paints, acrylic resin paints, polyester resin paints, vinyl resin paints, melamine resin paints, epoxy resin paints, urethane resin paints, fluorine resin paints, and the like can be given.

In the present invention, the overspray paint adhered on the collecting material flows down in the direction of gravity, and is collected below the collecting material. However, the collecting material and the vinyl sheet of the present invention are collected in the inclined direction. It is also possible to collect the overspray paint on the side of the collecting material by arranging a material to which the paint hardly adheres. Before the overspray paint flows down in the direction of gravity, a collection tank for storing the paint can be installed. The recovered paint can be reused as it is or adjusted. If adjustment is necessary, depending on the components of the overspray paint, for example, a diluent such as water, a neutralizing agent such as amines and acids, an alcohol-based,
A glycol-based or cellosolve-based solvent or other additives can be added, mixed, filtered, and reused.

[0015]

Next, an embodiment of the present invention will be described. <Preparation of paint A> Modified thermosetting acrylic resin varnish: 60
Parts, titanium oxide: 25 parts, methyl silicate hydrophilic agent:
Paint A was prepared by mixing 6 parts and 9 parts of a hydrocarbon solvent.

<Preparation of Coating B> Modified thermosetting acrylic resin varnish: 60 parts, titanium oxide: 25 parts, methylsilicate-based hydrophilic agent: 10 parts, and hydrocarbon-based solvent: 5 parts were mixed.
Paint B was prepared.

<Preparation of Coating C> Coating C was prepared by mixing 60 parts of a modified thermosetting acrylic resin varnish, 25 parts of titanium oxide, and 15 parts of a hydrocarbon solvent.

<Preparation of collection material>
The coating was performed on a stainless steel material having a size of 200 × 2000 mm and a thickness of 3.0 mm. The materials coated with the paints A to C were used as collecting materials A to C, respectively. The contact angles of the surfaces of the trapping materials A to C were 62 °, 45 °, and 85 °, respectively.

Examples 1 and 2 and Comparative Example 1 The collectors A (Example 1), B (Example 2) and C (Comparative Example 1) were placed in front of the dry spray coating booth, respectively, as shown in FIG. As shown in FIG. 2, the collecting material was placed in an interdigitated manner at the rear part of the container, and the overspray paint collecting container was placed below the collecting material. The collecting material was attached to the lower part of a pipe-like material for circulating cooling water as shown in FIG. About 1cm for pipe
Holes with a diameter of 3 mm are opened at intervals. After that, Technon # 200 (trade name, manufactured by Dainippon Paint Co., Ltd .: N
V = 40%; coating efficiency 50%)
The coating was performed at g / min for 3 hours.

The results are shown in Table 1.

[0021]

[0022]

According to the method and apparatus for recovering a water-based paint of the present invention, the oversprayed paint can be easily recovered as it is or with a simple adjustment as a reusable paint.

[Brief description of the drawings]

FIG. 1 is a schematic front view of the arrangement of a collecting material.

FIG. 2 is a schematic plan view of an arrangement of a collecting material.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Kobayashi 3-9-11 Takamoridai, Kasugai-shi, Aichi

Claims (4)

[Claims] 1. A material having a hydrophilic function of a contact angle of 70 ° or less with water or a contact angle of 70 ° or less is provided in front of a filter or a wet dust collector that collects an oversprayed water-based paint. A method for collecting a water-based paint, comprising: arranging a plate-shaped, pipe-shaped, or string-shaped collection material made of a material in an interdigital shape, and adhering and collecting the water-based paint on the collection material. 2. The method for recovering a water-based paint according to claim 1, wherein the blinds of the trapping material are arranged in two or more rows at intervals. 3. A material having a hydrophilic function having a contact angle of 70 ° or less with water or a contact angle of 70 ° or less is provided in front of a filter or a wet dust collector for collecting the oversprayed water-based paint. A water-based paint collecting apparatus, wherein a plate-like, pipe-like, or string-like collecting material made of a material is arranged in a blind shape. 4. The water-based paint recovery device according to claim 3, wherein the blinds of the trapping material are arranged in two or more rows at intervals.