JPH10137554A - Hollow-fiber membrane plate and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hollow-fiber membrane plate usable as a collector for recovering an oversprayed paint as such or as a reusable paint by the simple concentration or adjustment of composition in a spray coating booth used when an article is coated and to furnish its producing method. SOLUTION: A hollow-fiber membrane 1 with one or both ends opened is arranged on a plate 2 at regular intervals or adjacent to one another. The whole or a part of the surface of the membrane 1 in contact with the plate 2 is supported and fixed by a fixing material, a distribution pipe 4 communicating with the open end of each membrane 1 is provided to constitute a hollow- fiber membrane plate, and the membrane plate is produced by transferring the membrane 1 set on a grooved plate to the plate 2 coated with the fixing material and then mounting the distribution pipe 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray painting booth used for painting articles, for recovering oversprayed paint as it is or as a paint that can be reused by simple concentration and adjustment of components. And a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, for the purpose of, for example, preventing environmental pollution, paints oversprayed when painting articles have been collected by various methods. Those methods are
For example, a method of collecting with a filter made of an enclosing plate called a dry method, glass wool, nonwoven fabric, paper, etc., a liquid mist of water or oil called a wet method, a curtain-shaped liquid flow, a recovered liquid It is a method of collecting in a tank or the like.

[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 a period of use, both the filter and the overspray paint are generally discarded without being reused, which increases the running cost for renewing the filter and causes environmental problems due to the generation of industrial waste.

In the wet method, a liquid mist such as water or oil, a curtain-like liquid stream, and a collected liquid collected in a collected liquid tank are separated into a solid and a liquid by using an agent called an anti-adhesive, and solidified. It is common to dispose of overspray paint that has been used, and there is an environmental problem due to the generation of industrial waste.

[0005] In the wet method, a method of condensing a collected liquid of the overspray paint to regenerate and reuse the paint is also performed. However, the collected liquid is treated for concentration, adjustment of components, and the like. Equipment was required, and it was not easy to recover and reuse overspray paint. Under such circumstances, there is a need for a trapping material capable of collecting the oversprayed paint as it is in a spray painting booth used when painting an article, or as a paint that can be reused by simple concentration, adjustment of components, and the like. I have.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and an object thereof is to provide a filter or a wet dust collector for collecting oversprayed paint, or to replace the filter or the wet dust collector. A hollow fiber membrane plate used as a collecting material that can be used for a long period of time while efficiently collecting oversprayed paint without diluting it too much and preventing contamination due to sticking of paint and the like, and a method of manufacturing the same Is to provide.

[0007]

A hollow fiber membrane plate according to the present invention is arranged such that hollow fiber membranes having both ends or one end open on the plate are arranged at regular intervals or adjacent to each other, and are in contact with the plate. And a part thereof is supported and fixed by a fixing material, and is provided with a distribution pipe communicating with the open end of each hollow fiber membrane.

In the method for manufacturing a hollow fiber membrane plate according to the present invention, the hollow fiber membrane is housed in the groove of the grooved plate, and the plate coated with the fixing material is held on the plate. After transferring and fixing the hollow fiber membranes, a distribution pipe communicating with the open end of each hollow fiber membrane is attached.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a hollow fiber membrane plate of the present invention and a method for producing the same will be described in detail. One specific example of the hollow fiber membrane plate of the present invention will be described with reference to FIGS. 1 and 2.
The hollow fiber membranes 1 that are open are arranged in parallel at predetermined intervals and supported and fixed by a fixing material 3. At the open end of the hollow fiber membrane 1, a distribution pipe 4 communicating with the hollow fiber membrane 1 is provided.

[0010] The hollow fiber membrane plate of the present invention is usually used in a vertical position, and is supplied with pressurized water or an aqueous solution containing an amine or a solvent contained in a water-based paint to a distribution pipe.
While exuding water or the aqueous solution from the surface of each hollow fiber membrane and keeping the surface of the hollow fiber membrane wet, while washing off the attached overspray paint (aqueous paint such as a water-based paint or a water-dispersed paint), It flows down in the direction of gravity. Then, the overspray paint can be collected by collecting the flowing liquid.

That is, the hollow fiber membrane plate of the present invention is susceptible to humidity due to the use of water, and makes use of the characteristics of a water-based paint that sagging occurs and does not dry under high humidity. Since the surface of the hollow fiber membrane is always in a wet state, the oversprayed paint can be fixed without being fixed, and can be prevented from being fixed with a small amount of water, so that the paint concentration can be recovered without being excessively reduced.

The hollow fiber membrane plate of the present invention can be used in any size and any number according to the required collecting area. However, if the unit area is large, it becomes difficult to manufacture and the handling becomes difficult. A plurality of sheets can be used side by side.
If a plurality of hollow fiber membrane plates are installed, evacuate them so that the overspray paint moves toward the hollow fiber membrane plates and is placed at an appropriate distance from each other so that it can be collected reliably. It is preferable to provide them.
Usually, it is most preferably installed in a spray painting booth, but it 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 hollow fiber membrane plate is located behind or on the side of the painted article as viewed from the painting machine, and it is necessary to install it at a position in front of the filter or the wet dust collector that collects paint in the spray painting booth. It can be installed instead of a filter or a wet dust collector that collects paint in the paint booth.

The pore diameter of the hollow fiber membrane used in the hollow fiber membrane plate of the present invention is 0.001 μm to 10 μm, preferably 0.001 μm to 0.1 μm, and is selected from a wide range from an ultrafiltration membrane to a microfiltration membrane. The structure of the membrane is not limited, but a membrane with low water permeability that can control the amount of exuding water to a very small amount is preferable. The material of the hollow fiber membrane is made of polyethylene, polypropylene, polyvinylidene fluoride, poly-4-vinylidene fluoride, polysulfone, polyethersulfone, polyacrylonitrile, polyamide or cellulose-based organic polymer material, and inorganic materials such as alumina and silicon carbide. Although not particularly limited, a hydrophilic film is particularly preferable because a hydrophobic film forms relatively large droplets when water seeps out of the surface and has low surface wettability. The hollow fiber membrane has an outer diameter of 0.5 mm to 6 m.
m, preferably 1 mm to 6 mm, more preferably 2 mm
If the outer diameter is 1 mm or less, it is difficult to install a distribution pipe, and the surface area occupied by one hollow fiber membrane plate becomes large, so that it is difficult to control a small amount of oozing water. Therefore, a thick hollow fiber membrane is preferable. Note that the inner diameter is sufficient as long as water can pass through, and can be set arbitrarily.

The intervals between the hollow fiber membranes can be arranged such that the hollow fiber membranes are adjacent to each other, or can be arranged at a maximum interval corresponding to the outer diameter of the hollow fiber membranes. If the interval is larger than the outer diameter of the hollow fiber membrane, the humidity of the space formed between the hollow fiber membrane and the plate cannot be maintained to the extent that the overspray paint does not adhere, and the adhesion to the plate occurs. .

The length of the hollow fiber membrane is preferably longer than that of the plate in order to attach the distribution pipe to the upper end of the plate and to collect the overspray paint flowing down the plate.

The fixing material used for the hollow fiber membrane plate of the present invention can be any adhesive material such as epoxy resin, urethane resin, silicon resin, etc. which can bond the hollow fiber membrane to the plate. The hollow fiber membrane can be supported and fixed by a method of attaching a double-sided tape.

Further, the material of the plate used for the hollow fiber membrane plate of the present invention can be arbitrarily selected from those having no water absorption, such as SUS, vinyl chloride, polyethylene and polypropylene. Although the thickness of the plate is not particularly limited, it is necessary to be thick enough not to bend in practical use. In addition, in order to support and fix the hollow fiber membranes adjacent to each other without bending or at a fixed interval, the plate further maintains the collection efficiency of the overspray paint when an interval is provided between the hollow fiber membranes. Is essential on.

The distribution pipe used for the hollow fiber membrane plate of the present invention is a pipe having the same number of nozzles as the hollow fiber membrane.
Various tubes, capillary tubes, and the like can be used to connect each nozzle to the open end of the hollow fiber membrane, and are connected by a method such as insertion, adhesion, or welding. The distribution pipe is used for supplying water or an aqueous solution containing an amine or a solvent. When both ends of the hollow fiber membrane are open, one is used for supplying the water or the aqueous solution, and one is used for supplying the water or the aqueous solution. It can be used as a collecting pipe for circulating an aqueous solution.

As described above, the hollow fiber membrane plate of the present invention can be applied to water-based paints such as water-based paints and water-dispersed paints. If an organic solvent is supplied into the hollow fiber membrane, it can be applied to an organic solvent-based coating.

Next, according to the method for manufacturing a hollow fiber membrane plate of the present invention, the hollow fiber membrane is housed in the groove of the grooved plate, and the plate coated with the fixing material is held on the plate. After transferring and fixing the hollow fiber membranes to the plate, a distribution pipe communicating with the open end of each hollow fiber membrane is attached. The groove used here is preferably approximately the same diameter as the outer diameter of the hollow fiber membrane so that the hollow fiber membrane can be securely housed, and the depth is preferably such that the surface of the hollow fiber membrane slightly projects. As the fixing material, various kinds of adhesives can be used as described above, and the application to the plate is generally performed by spraying, but it can also be performed by a roller or brush painting. If the fixing material used has a high viscosity and is difficult to spray, it may be diluted with a solvent before use. The application may be performed on the entire plate or partially so that a part of the hollow fiber membrane is supported and fixed.After the application, the application surface is held on the hollow fiber membrane storage plate and left until the fixing material is cured. Then, transfer and fix. In this case, since the hollow fiber membrane is dried, it is necessary to attach a wetting agent in advance if the membrane is hydrophilic. On the other hand, if the membrane is a hydrophobic membrane, it may be transferred and fixed in a dry state, and may be hydrophilized with alcohol or the like when actually using the hollow fiber membrane plate.

Next, an embodiment in which the hollow fiber membrane plate of the present invention is used as a collecting material for overspray paint will be described with reference to FIG. When the water-based paint is sprayed toward the object 6 from the air, the object 6 and the exhaust fan 9 are sprayed.
The excess overspray paint that has not been applied to the object 6 is captured by the hollow fiber membrane plate 7 of the present invention vertically placed between the above and the paint recovery container disposed below the excess overspray paint. Collected in 8. Since the recovered paint has a low degree of dilution, it can be reused as it is or after simple concentration and adjustment of components.

[0022]

The hollow fiber membrane plate of the present invention can easily collect oversprayed paint simply by oozing water from the surface of the hollow fiber membrane. It can be reused by simple concentration and adjustment of components. In addition, it is suitable as a collecting material for overspray paint because it is not easily stained due to adhesion of paint and can be used for a long time and can be manufactured by a simple method.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a hollow fiber membrane plate of the present invention.

FIG. 2 is a schematic sectional view showing an example of the hollow fiber membrane plate of the present invention.

FIG. 3 is a schematic view of a coating booth provided with the hollow fiber membrane plate of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 hollow fiber membrane 2 plate 3 fixing material 4 minute pipe 5 air spray gun 6 coated object 7 hollow fiber membrane plate shown in FIG. 8 8 paint collection container 9 exhaust fan 10 exhaust duct 11 spray painting booth

Continuation of front page (72) Inventor Hiroaki Maruoka 6-10-73 Minamitsukaguchi-cho, Amagasaki City, Hyogo Prefecture Inside Shinto Paint Co., Ltd.

Claims (2)

[Claims] 1. A hollow fiber membrane having both ends or one end opened on a plate is arranged at regular intervals or adjacent to each other, and the entire surface or a part of the surface of the hollow fiber membrane in contact with the plate is supported and fixed by a fixing material. A hollow fiber membrane plate comprising a distribution pipe communicating with an open end of each hollow fiber membrane. 2. A hollow fiber membrane is accommodated in the groove of the plate having the groove formed thereon, and the plate coated with the fixing material is held on the plate to transfer and fix the hollow fiber membrane. The method for producing a hollow fiber membrane plate according to claim 1, wherein a distribution pipe communicating with an open end of the membrane is attached.