JPH10230204A - Paint recovering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paint recovering device by which recovering work of paint from a recovering body is easily done without causing the lowering of quality and a change in components of recovered water base paint. SOLUTION: Polyethylene glycol No.400 consisting of a high molecular body of ethylene glycol that undercoat paint P contains and having vapor pressure lower than that of water and sufficient viscosity for keeping it on a surface 21a of a recovery plate 21 is applied as a release agent 30 to the surface 21a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint collection method in which, when a water-based paint is spray-coated on a work to be coated, the paint scattered over the work to be coated is adhered to the surface of a collection body and collected. It relates to improvement of the device.

[0002]

2. Description of the Related Art Conventionally, in a coating facility in which a water-based paint is sprayed onto a work to be coated, a recovery body such as a partition is set up behind the work to be coated. A mist of water-based paint (hereinafter, simply referred to as overspray mist) scattered over a workpiece to be coated is applied to the surface of the collection body to collect the mist.

However, in this type of paint collecting apparatus, the overspray mist adhering to the collecting body is in a state of being very easily dried, so that there is a possibility that the overspray mist may coagulate and solidify on the surface of the collecting body as it is. Not only does the work of collecting paint from the body become complicated, but also the ratio of agglomerated and solidified substances contained in the recovered paint increases, leading to deterioration of the quality of the water-based paint.

[0004] On the other hand, some of the above-mentioned paint collection devices have a configuration in which an oil film is formed on the surface of the paint by applying grease or oil to the collection body, and the attached overspray mist is collected together with the grease or oil. Yes, they are.

According to such a paint collecting apparatus, since the overspray mist is prevented from being dried by the grease or oil, the work of collecting the paint from the collecting body can be easily performed. In addition, water and oil are mixed as foreign substances, which causes a remarkable component change in the water-based paint.

[0006] In view of the above circumstances, the present invention provides a method for reducing the quality of recovered aqueous paint and causing no change in components.
It is an object of the present invention to provide a paint collecting apparatus capable of easily performing a paint collecting operation from a collecting body.

[0007]

According to the present invention, when a water-based paint is spray-coated on a work to be coated, the paint scattered over the work to be coated is adhered to the surface of a collection body and collected. In the paint collecting apparatus, a stripping liquid made of a polymer of the substance contained in the water-based paint, having a lower vapor pressure than water, and having a viscosity sufficient to remain on the surface of the collecting body is applied to the surface of the collecting body. Has been applied.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing one embodiment. FIG. 1 conceptually shows a coating facility to which an embodiment of a paint collecting apparatus according to the present invention is applied. The paint equipment exemplified here contains a water-based paint, specifically, ethylene glycol as a deicing agent, sequentially in an automotive fuel tank (workpiece to be painted) W carried into the painting booth 2 by the conveyor 1. This is for spray-coating an acrylic emulsion-based undercoat paint (water-based paint) P. A water curtain device 10 is provided inside the coating booth 2 at a position opposed to the spray gun 4 of the automatic coating machine 3 with the transport conveyor 1 interposed therebetween. It has.

The water curtain device 10 has a size that covers substantially the entire area of one side surface of the coating booth 2, and includes a guide plate 11 arranged along a vertical direction, and a guide plate 1.
1 is provided with a water storage tank 12 installed horizontally so as to extend over the entire length of the upper part 1. Water supplied from a flowing water source 14 to the water storage tank 12 via a water amount adjustment valve 13 passes over the guide plate 11. The guide plate 1
1 has the function of forming the water flow film 15 on the surface. The water that has flowed down the guide plate 11 as the water flow film 15 is stored in a drain passage 16 formed below the inside of the coating booth 2, and then again passed through a filter (not shown).
Will be refluxed. Reference numeral 17 in the figure denotes a baffle plate for rectifying the water supplied to the water storage tank 12,
Reference numeral 18 denotes a plate for forming an eliminator in the exhaust passage 19.

In the above-mentioned coating equipment, the conveyor 1
The paint collection device 20 is disposed at a position located between the transport area of the fuel tank W and the water curtain device 10 in FIG. As shown in FIGS. 1 and 2, the paint collection device 20 is sufficiently larger than the projected area of the fuel tank W, has rust prevention, and has sufficient chemical resistance to the undercoat paint P described above. A plate-shaped collection body, for example, a collection plate (collection body) 21 made of stainless steel, and a tray 22 projecting perpendicularly from a lower end of the collection plate 21
In the vicinity of the rear area of the fuel tank W carried in by the conveyor 1, the recovery plate 21 is erected in the vertical direction in parallel with the guide plate 11, and the tray 22 is conveyed. It faces the lower area of the conveyor 1.

Further, in the above-mentioned coating equipment, polyethylene glycol N is previously applied to the entire surface 21a of the collecting plate 21 facing the spray gun 4 of the automatic coating machine 3.
o. 400 (average molecular weight: 380 to 420) is applied as a release agent (removal liquid) 30. Polyethylene glycol No. 400 is a polymer of ethylene glycol contained in the undercoat paint P as an antifreezing agent, and has a vapor pressure of 9.0 × 10 −5 (mmHg: 100
° C), viscosity 170 (cps: 20 ° C), freezing point 4 ~
It is a transparent viscous liquid having the property of 8 ° C., and when applied to the surface 21 a of the collection plate 21, does not flow down from the surface 21 a of the collection plate 21 due to its viscosity, and is hard to volatilize. It assumes a liquid state.

[0012] The polyethylene glycol includes the above-mentioned No. Although there are several types having different average molecular weights other than No. 400, for example, When the molecular weight is 300 or less, that is, when the average molecular weight is 315 or less, the viscosity is 90.
(Cps: 20 ° C.) or less.
Will flow down without remaining on the surface 21a of In the case of 600 or more, that is, when the average molecular weight is 570 or more, the viscosity is 350 (cps:
(20 ° C.) or higher and a solidification point of 19 ° C. or higher, indicating a solid state at room temperature in the atmosphere of the coating booth 2.

In the coating equipment configured as described above, the fuel tank W is placed inside the coating booth 2 by the conveyor 1.
Is carried in, the automatic coating machine 3 is operated appropriately, and the fuel tank W is coated by spraying the undercoat paint P from the spray gun 4.

During this time, in the above-mentioned coating equipment, most of the overspray mist adheres to the release agent 30 applied to the surface 21a of the collection plate 21. It is possible to prevent the occurrence of a defect.

Moreover, polyethylene glycol N applied as a release agent 30 to the surface 21a of the collection plate 21
o. The reference numeral 400 indicates a liquid state continuously as described above.

Accordingly, the overspray mist is
When it adheres to the release agent 30, it is taken into the inside of the release agent 30, so that contact with the air is hindered. Further, when moving down gradually by its own weight, the surroundings are completely wrapped in the release agent 30, and contact with the air Is dropped onto the tray 22 in a state where it is almost blocked.

As a result, according to the above-mentioned coating equipment, the situation where the overspray mist is dried and coagulated and solidified is prevented, and the overspray mist is very easily collected together with the release agent 30 from the collection plate 21 or the tray 22. Will be able to do it.

Further, the recovered overspray mist has a small percentage of coagulated and solidified material as described above, and the mixed release agent 30 is a polymer of ethylene glycol contained in the undercoat paint P as an antifreezing agent. Therefore, the acrylic emulsion does not cause a problem such as gelation, and does not cause a significant deterioration in quality or a change in components of the undercoat paint P.

Therefore, the overspray mist thus collected is subjected to an appropriate regeneration treatment, for example, a treatment for removing coagulated solids and dust, and a treatment for adding an appropriate amount of an acrylic emulsion, and then mixing it with a new paint. In addition, it is possible to ensure a predetermined performance of the coating film even when recycled.

The release agent 3 applied to the surface 21a of the recovery plate 21 with the recovery of the overspray mist
Since 0 gradually decreases, it is necessary to periodically re-apply the surface by a suitable method such as a brush according to the frequency of use, and cover the surface 21a of the recovery plate 21 with the release agent 30 which always exhibits a liquid state. There is.

As described above, according to the above-mentioned coating equipment, a polymer of ethylene glycol contained in the undercoat paint P is used as the release agent 30 on the surface 21a of the collection plate 21. Polyethylene glycol No. having sufficient viscosity to remain on the surface 21a of the plate 21; Since 400 is applied, it is possible to prevent the adhering overmist from drying and to facilitate the collection operation without causing deterioration in the quality of the collected paint and a change in the components.

In the above-described embodiment, the paint collecting apparatus applied to the coating equipment for coating the fuel tank for the automobile carried by the conveyor is exemplified. However, the present invention is not limited to this. However, the present invention can also be applied to other workpieces to be coated. In this case, the work to be coated is not necessarily limited to the work carried in by the conveyor. Furthermore, since a water curtain device is provided on one side of the coating booth, it is possible to reliably catch the mist of the water-based paint that has scattered over the collecting body by the water flow film, but it is not always necessary to use the water curtain. No equipment is required.

In the above-described embodiment, an apparatus for recovering an acrylic emulsion-based undercoat paint containing ethylene glycol as a deicing agent is exemplified. Although 400 is applied as a stripper, the present invention is not limited to these combinations. For example, in the case of a water-based paint containing propylene glycol as an antifreezing agent, an appropriate one can be selected as a stripping solution from polypropylene glycol which is a polymer of propylene glycol. Also,
Even in acrylic emulsion undercoat paints containing ethylene glycol as an antifreeze, plasticizers, thickeners, wetting agents / dispersants, defoamers, preservatives / fungicides, pH adjusters, coalescing agents For example, an appropriate release solution may be selected from the polymer of the component other than the antifreezing agent.

Further, in the above-described embodiment, a plate-shaped recovery body is applied. However, if the surface has a surface for catching overspray mist, the recovery body is necessarily formed in a plate shape. No need. In addition, the surface of the recovery body is arranged along the vertical direction, but may be inclined as long as the overspray mist can be captured. In addition, a tray is provided at the lower end of the collection body so as to face a region below the work to be coated, but it is not always necessary to provide a tray. When a tray is provided at the lower end of the collection body, it is preferable to apply a stripping liquid to the surface of the tray. Furthermore, although the collected body is arranged only in the rear area of the work to be coated, for example, if the collected body is also arranged in the upper, lower, left and right areas of the work to be coated, various kinds of floating mist caused by overspray mist float. It is possible to more reliably prevent the occurrence of a defect. Also in this case, it is needless to say that it is preferable to apply the stripping liquid to the surfaces of the collection bodies arranged in the upper, lower, left, and right regions, respectively.

[0025]

As described above, according to the present invention,
The water-based paint contains a polymer that has a vapor pressure lower than that of water and has sufficient viscosity to stay on the surface of the collection body. The work of collecting the paint from the collection body can be easily performed without causing the deterioration of the quality of the water-based paint and the change of the components.

[Brief description of the drawings]

FIG. 1 is a sectional view conceptually showing a coating facility to which an embodiment of a paint collecting apparatus according to the present invention is applied.

FIG. 2 is an II view in FIG.

[Explanation of symbols]

 Reference Signs List 20 paint collection device 21 collection plate 21a collection plate surface 30 release agent P undercoat paint W fuel tank

Claims (1)

[Claims] 1. A paint collecting apparatus, wherein when a water-based paint is spray-coated on a work to be coated, a paint scattered over the work to be coated is attached to and collected on the surface of a collection body. A stripper having a vapor pressure lower than that of water and having a viscosity sufficient to remain on the surface of the recovery body is applied to the surface of the recovery body. Paint collection device.