JP2003293155A - Pre-coating treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pre-coating treatment apparatus which can make space lesser, productivity higher, expenses of equipment and chemicals lower and man-hours for management and burden on a waste water treatment lesser as a result of shortening of treatment process steps. <P>SOLUTION: The apparatus has a treating vessel 1 filled with a degreasing and chemical conversion treating solution, a first circulating system 11 for circulating the degreasing and chemical conversion treating solution in the treating vessel and returning the solution to the treating vessel 1, a dust remover 2 disposed in the circulating system to remove the dust included in the treating solution, a chemical conversion sludge remover 3 disposed in the circulating system to remove the chemical conversion sludge included in the treating solution, an oil-component remover 4 disposed in the circulating system to remove the oil- component included in the treating solution, a treating solution replenishing vessel 6 disposed in the circulating system to replenish the treating vessel with the fresh treating solution, a water-polar organic solvent separator 5 disposed in the circulating system to separate the water component in the treating solution and the polar organic solvent and returning the polar organic solvent component to the circulating system, an ion remover 7 disposed in the circulating system to remove ion components from the water component separated by the separator 5 and to return the remaining water to the vessel 6, and a slope 31 provided with nozzles 34 for slushing and high-pressure sprays 32 between two vessels 1 and 8. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention performs pre-painting treatment from degreasing treatment to zinc phosphate chemical conversion treatment in the same step on a metal surface to which oil components such as rust preventive oil, press oil and cutting oil adhere. The present invention relates to a pretreatment device for coating used when performing.

[0002]

2. Description of the Related Art At present, zinc phosphate chemical conversion treatment is widely performed on metal surfaces plated with iron or zinc to impart rust prevention and paintability.

The general treatment steps of this type of zinc phosphate treatment are as follows: degreasing → washing → surface adjustment → chemical conversion treatment (zinc phosphate treatment) → washing → drying. The degreasing treatment, degreasing water washing, and surface adjustment are carried out in multiple steps if necessary.

By the way, in order for the zinc phosphate chemical conversion coating obtained in this chemical conversion treatment step to have excellent rust prevention and coating properties as a coating base, the coating weight is 2 to 5 g / m 2.
A uniform and dense crystal film of about ² is desirable. In order to realize such a crystal film, a degreasing process to remove oil adhering to the metal surface is essential for film deposition, and a titanium colloid-based treatment liquid is used for densifying film crystals. The surface adjustment process that was necessary was essential.

[0005]

However, when the above-mentioned zinc phosphate treatment is carried out, there are generally the following three problems.

The first problem is that the total processing steps are very long. This results in a large and large number of processing equipments, a large amount of space is required, which is expensive, and a considerable amount of time is required to pass through all the processing steps, resulting in low productivity.

The second problem is that there are many management items. For example, if the degreasing is alkaline degreasing, the alkalinity of degreasing (total alkalinity, free alkalinity) and the concentration of the surface conditioning solution (total alkalinity, titanium concentration) should be controlled when using titanium colloidal surface preparation. To
There are a wide variety of items to manage, which imposes a heavy operational burden. Moreover, since the medicine is consumed in each process, the cost burden is considerably large. The degreasing liquid is consumed by adhering to the object to be processed and carried out to the next step (water washing step), and is also consumed at the time of regular disposal and renewal. Further, the surface conditioning liquid is consumed when it is taken out or when it is renewed by discarding it. Further, since the durability of the treatment liquid is low, continuous partial renewal (auto drain) is often performed, and this is also consumed.

A third problem is that the amount of wash water discharged increases. Since a defect often occurs when the degreasing liquid is brought into the surface conditioning liquid or the zinc phosphate chemical conversion treatment liquid, a water washing process is always installed after the degreasing process.
Even after the zinc phosphate chemical conversion treatment, if the treatment liquid remains on the surface of the object to be treated, problems will occur regardless of whether it is used as a coating base or for rust prevention. Required. As described above, a large amount of wash water is discharged from the two systems after degreasing and after zinc phosphate conversion treatment, so that the burden on wastewater treatment is considerably large.

The present invention aims to provide a pretreatment apparatus for coating, which can save space, improve productivity, and significantly reduce facility costs, chemical costs, management man-hours, and wastewater treatment burden by shortening the treatment steps. To aim.

[0010]

(1) In order to achieve the above object, according to the present invention, a degreasing treatment is applied to an object to be coated,
A pretreatment device for coating that performs surface adjustment and chemical conversion treatment,
At least a first dipping tank and a second dipping tank adjacent to the first dipping tank,
A coating pretreatment apparatus is provided in which one of the first dipping tank and the second dipping tank is provided at a position higher in the vertical direction than the other of the first dipping tank and the second dipping tank. (See claim 1).

In the coating pretreatment device of the present invention, two adjacent
One dipping tank is provided at a position vertically higher than the other dipping tank. As a result, compared to the case where adjacent dipping tanks are installed at the same height in the vertical direction, the bath time between the first dipping tank and the second dipping tank becomes longer and the dipping tank adheres to the object to be coated. It is possible to improve the coating quality of the object to be coated by effectively removing the generated dust.

In the above invention, it is more preferable that an inclined surface is provided between the outlet side of the first dipping tank and the inlet side of the second dipping tank.

By providing an inclined surface between the outlet side of the first dipping tank and the inlet of the second dipping tank, the fluid flowing down from the object to be coated is provided at a low height in the vertical direction. By returning to the first dipping tank or the second dipping tank and circulating it, it is possible to reduce the usage amount of the fluid.

Further, in the above-mentioned invention, it is more preferable that the article to be coated is slanted and moved from the first dipping tank to the second dipping tank.

By inclining and moving the object to be coated between the two dipping tanks, the quality of coating of the object to be coated can be improved by more effectively removing dust adhering to the object to be coated. It will be possible.

Further, in the above invention, the second dipping tank is provided at a position higher in the vertical direction than the first dipping tank, and sucks the fluid filled in the first dipping tank. An outflow means for outflowing the fluid to the inside of the object to be coated, the outflow means being provided on the inclined surface between the first dipping tank and the second dipping tank. Is more preferable.

Further, in the above invention, there is further provided high pressure injection means for sucking the fluid filled in the first dipping tank and injecting the fluid at a high pressure to the outside of the object to be coated. More preferably, means is provided on the inclined surface between the first dipping tank and the second dipping tank.

The second dipping tank is provided at a position higher in the vertical direction than the first dipping tank, and the fluid filled in the first dipping tank by the outflow means provided on the inclined surface between the two dipping tanks. To the inside of the article to be coated. Further, the fluid filled in the first dipping tank is jetted at high pressure to the outside of the object to be coated by the high-pressure jetting means provided on the inclined surface. As a result, it becomes possible to improve the coating quality of the object to be coated by more effectively removing dust adhering to the inside and the outside of the object to be coated. Further, the inclined surface provided between the two dipping tanks makes it possible to circulate and use the fluid, and it is possible to reduce the usage amount of the fluid.

Further, in the above invention, the second dipping tank is provided at a position higher in the vertical direction than the first dipping tank, and sucks the fluid filled in the second dipping tank. More preferably, the high pressure injection means for injecting the high pressure to the object to be coated is provided, and the high pressure injection means is provided on the inclined surface between the first dipping tank and the second dipping tank. preferable.

When the first dipping tank is provided at a position higher than the second dipping tank in the vertical direction,
By injecting the fluid filled in the second dipping tank at a high pressure with respect to the object to be coated by the high-pressure injection means provided on the inclined surface between the two dipping tanks, the cleaning effect is improved and the like. It is possible to improve the quality of painting.

(2) In the invention described in any one of 1 to 6 above, the first dipping tank is a processing tank filled with a degreasing / chemical conversion treatment liquid, and the second dipping tank is the treatment. A rinsing tank that is provided in a subsequent stage adjacent to the tank and is filled with a cleaning liquid, and a first circulation system that sucks the degreasing / chemical conversion treatment liquid in the processing tank and returns it to the processing tank, and the degreasing / chemical conversion treatment. Dust removing means for removing dust contained in the liquid, chemical conversion sludge removing means provided in the first circulation system for removing chemical conversion sludge contained in the degreasing / chemical conversion treatment liquid, and the degreasing / chemical conversion treatment liquid. An oil removing means for removing the contained oil and a treatment provided in the first circulation system for adjusting the liquid that has passed through the dust removing means, the chemical conversion sludge removing means and the oil removing means, and supplying it to the processing tank. Further liquid replenishment tank May be pressurized (claim 7
reference).

In the present invention, the degreasing / chemical conversion treatment liquid in the treatment tank is sucked by the first circulation system and returned to the treatment tank, so that the treatment liquid can be closed and the material cost can be reduced to reduce the cost. Can be planned.

Further, since the treatment tank of the present invention is filled with the degreasing / chemical conversion treatment liquid, the degreasing treatment and the chemical conversion treatment of the object to be treated can be carried out in the minimum one step. As a result, the installation space of the device can be saved and the facility cost can be reduced. Moreover, since the process passage time is shortened, the productivity is improved.

Further, by using the degreasing / chemical conversion treatment liquid, the man-hours for managing the pretreatment conditions can be reduced. Also,
By using this degreasing / chemical conversion treatment liquid, the washing process can be significantly reduced, the amount of the cleaning liquid used can be drastically reduced, and the burden on the wastewater treatment process can be reduced.

By the way, the dust removing means can be provided not only in the first circulation system but also in other than the first circulation system, for example, inside or outside the treatment tank. When the dust removing means is provided in the first circulation system, the treatment liquid in the treatment tank is treated tank → dust removing means → sludge removing means →
It is circulated from the oil content removing means to the processing liquid replenishing tank to the processing tank. In the above invention, the order of the dust removing means, the sludge removing means, and the oil content removing means is not particularly limited, and may be an order other than the order described above.

(3) Further, in the invention according to any one of claims 1 to 6, the first dipping tank is a processing tank filled with a degreasing / chemical conversion treatment liquid, and the second dipping tank. Is a rinse tank which is provided in a subsequent stage adjacent to the treatment tank and is filled with a cleaning liquid, and a second circulation system which sucks the degreasing / chemical conversion treatment liquid in the treatment tank and supplies it to the rinse tank, Dust removing means for removing dust contained in the degreasing / chemical conversion treatment liquid; chemical conversion sludge removing means provided in the second circulation system for removing chemical conversion sludge contained in the degreasing / chemical conversion treatment liquid; Oil content removing means for removing oil contained in the combined chemical conversion treatment liquid and water-polar organic solvent separation provided in the second circulation system for separating water components in the degreasing combined chemical conversion treatment liquid and polar organic solvent Means and the second circulation system And an ion removing unit for removing the ionic component from the water component separated by the water-polar organic solvent separating unit and returning the residual water to the rinse tank (see claim 10). .

In the present invention, the degreasing / chemical conversion treatment liquid in the treatment tank is sucked by the second circulation system, the water component is extracted by the water-polar organic solvent separating means, and further the ion component is removed from this water component by the ion removing means. Since the ionic components are removed, pure water can be supplied to the rinse tank. As a result, the treatment liquid can be closed, the regeneration rate can be improved, the material cost can be reduced, and the cost can be reduced and the burden of the wastewater treatment process can be reduced.

Further, since the treatment tank of the present invention is filled with the degreasing / chemical conversion treatment liquid, the degreasing treatment and the chemical conversion treatment of the object to be treated can be carried out in the minimum one step. As a result, the installation space of the device can be saved and the facility cost can be reduced. Moreover, since the process passage time is shortened, the productivity is improved.

Further, by using the degreasing / chemical conversion treatment liquid, it is possible to reduce the man-hours for managing the pretreatment conditions. Also,
By using this degreasing / chemical conversion treatment liquid, the washing process can be significantly reduced, the amount of the cleaning liquid used can be drastically reduced, and the burden on the wastewater treatment process can be reduced.

Incidentally, the dust removing means can be provided not only in the second circulating system but also in the processing tank or outside the processing tank other than the second circulating system. When the dust removing means is provided in the second circulation system, the treatment liquid in the treatment tank is treated tank → dust removing means → sludge removing means →
It is circulated in the order of oil removing means → water-polar organic solvent separating means → ion removing means → rinsing tank. In the above invention, the order of the dust removing means, the sludge removing means, and the oil content removing means is not particularly limited, and may be an order other than the order described above.

(4) In the invention according to any one of claims 1 to 6, the first dipping tank is a processing tank filled with a degreasing / chemical conversion treatment liquid, and the second dipping tank is A first circulation system which is provided in a subsequent stage adjacent to the treatment tank and which is filled with a cleaning liquid and which sucks the degreasing / chemical conversion treatment liquid in the treatment tank and returns it to the treatment tank; A dust removing means provided in the first circulation system for removing dust contained in the flowing liquid; a chemical conversion sludge removing means provided in the first circulation system for removing chemical sludge contained in the flowing liquid; And an oil content removing unit that is provided in the first circulation system and removes oil content contained in the flowing liquid;
Provided in the circulation system for adjusting the liquid that has passed through the dust removing means, the chemical sludge removing means, and the oil removing means, and sucking the liquid in the processing liquid replenishing tank for replenishing the processing tank and the rinse tank. Then, a third circulation system for leading to the most upstream means of the dust removing means, the chemical sludge removing means, and the oil content removing means can be further added (claim 13).
reference).

In the present invention, the processing liquid in the processing tank is circulated in the order of processing tank → dust removing means → sludge removing means → oil removing means → processing liquid supply tank → processing tank, while the liquid in the rinse tank is , Rinse tank → dust removing means → sludge removing means → oil removing means → processing liquid replenishing tank → processing tank.

In addition to the above-described effects of the invention, the present invention has the following effects. That is, in the present invention,
The degreasing / chemical conversion treatment liquid in the treatment tank is sucked by the first circulation system and returned to the treatment tank, while the liquid in the rinse tank is
It is sucked by the third circulation system and guided to the most upstream means of the dust removing means, the chemical sludge removing means and the oil content removing means.

Thus, dust, sludge and oil can be removed from the liquid in the rinse tank, and the polar organic solvent component contained in the liquid can be returned to the processing tank through the processing liquid supply means. That is, the liquid in the rinse tank can be closed in addition to the treatment liquid, and the cost can be reduced by reducing the material cost and the burden of the wastewater treatment process can be reduced.

In the above invention, the dust removing means,
The order of the sludge removing means and the oil content removing means is not particularly limited, and may be an order other than the order described above.

(5) Further, in the invention according to any one of claims 1 to 6, the first dipping tank is a processing tank filled with a degreasing / chemical conversion treatment liquid, and the second dipping tank. Is a rinse tank which is provided in a subsequent stage adjacent to the treatment tank and is filled with a cleaning liquid, and a second circulation system which sucks the degreasing / chemical conversion treatment liquid in the treatment tank and supplies it to the rinse tank, Dust removing means provided in the second circulation system for removing dust contained in the degreasing / chemical conversion treatment liquid; and chemical conversion sludge contained in the degreasing / chemical conversion treatment liquid provided in the second circulation system. Chemical conversion sludge removing means for removing the oil content, and oil content removing means provided in the second circulation system for removing oil content contained in the degreasing / chemical conversion treatment liquid;
Water-polar organic solvent separating means for separating the water component in the degreasing / chemical conversion treatment liquid and the polar organic solvent, and the water-polar organic solvent provided in the second circulation system. Ion removing means for removing ionic components from the water component separated by the separating means and returning the residual water to the rinse tank,
It is also possible to further add a third circulation system that sucks the liquid in the rinse tank and guides it to the most upstream means of the dust removing means, the chemical sludge removing means, and the oil content removing means. 17).

In the present invention, the treatment liquid in the treatment tank is circulated through the treatment tank → dust removing means → sludge removing means → oil removing means → water-polar organic solvent separating means → ion removing means → rinsing tank while The liquid in the rinse tank is circulated in the following manner: rinse tank → dust removing means → sludge removing means → oil removing means → water-polar organic solvent separating means → ion removing means → rinse tank.

In the present invention, the following operational effects are exhibited in addition to the operational effects of the above-mentioned invention. That is, in the present invention,
The degreasing / chemical conversion treatment liquid in the treatment tank is sucked by the second circulation system and supplied to the rinse tank, while the liquid in the rinse tank is sucked by the third circulation system to remove dust, chemical conversion sludge. It is led to the most upstream means of the removing means and the oil removing means.

Thus, dust, sludge and oil can be removed from the liquid in the rinse tank, and the water contained in the liquid can be returned to the rinse tank. In other words, in addition to the treatment liquid, the liquid in the rinse tank can be closed.
It is possible to reduce the cost by reducing the material cost and reduce the burden of the wastewater treatment process.

In the above invention, the dust removing means,
The order of the sludge removing means and the oil content removing means is not particularly limited, and may be an order other than the order described above.

By the way, as in the above-mentioned invention, since the degreasing / chemical conversion treatment liquid is filled in the treatment tank of the present invention, the degreasing treatment and the chemical conversion treatment of the object to be treated can be carried out in a minimum of one step. As a result, the installation space of the device can be saved and the facility cost can be reduced. Moreover, since the process passage time is shortened, the productivity is improved.

Further, by using the degreasing / chemical conversion treatment liquid, it is possible to reduce the man-hours for managing the pretreatment conditions. Further, by using this degreasing / chemical conversion treatment liquid, the washing process can be significantly reduced, and the amount of the cleaning liquid used can be drastically reduced, and at the same time, the burden on the wastewater treatment process can be reduced.

(6) In the above invention, although not particularly limited, the degreasing / chemical conversion treatment liquid is an alcohol, glycol ether or diethylene glycol ether-based polar organic solvent, water, zinc ion, phosphate ion, and manganese. More preferably, at least ions, nickel ions, and sodium ions are included (see claim 27).

[0044]

EFFECTS OF THE INVENTION According to the present invention, the bathing time between dipping tanks is lengthened, so that it is possible to improve the coating quality of the object to be coated such as effective removal of dust adhering to the object to be coated. Becomes

In addition to this, since the pretreatment liquid can be closed, the cost can be reduced by reducing the material cost.
The burden on the wastewater treatment process can be reduced.

Further, the degreasing treatment and the chemical conversion treatment can be carried out in the minimum one step, so that the apparatus installation space can be saved and the equipment cost can be reduced. Further, since the process passage time is shortened, productivity is improved.

Furthermore, by using the degreasing / chemical conversion treatment liquid, the man-hours for managing the pretreatment conditions can be reduced. Further, by using the degreasing / chemical conversion treatment liquid, the washing process can be significantly reduced, and the amount of the cleaning liquid used is reduced, so that the burden of the wastewater treatment process is reduced.

[0048]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment FIG. 1 is a view showing an embodiment of a pretreatment apparatus for coating according to the present invention, FIG. 2 is a perspective view and a sectional view showing an embodiment of a dust removing means according to the present invention, and FIG. FIG. 4 is a perspective view showing another embodiment of the dust removing means according to the present invention, FIG. 4 is a sectional view showing yet another embodiment of the dust removing means according to the present invention, and FIG. 5 is a water-polar organic solvent separating means according to the present invention. FIG. 6 is a conceptual diagram showing the embodiment of FIG. 6, and FIG. 6 is a conceptual diagram showing the embodiment of the ion removing means according to the present invention.

FIG. 1 shows a pre-coating treatment step for performing degreasing treatment, surface conditioning and chemical conversion treatment on an object to be coated such as an automobile body. As shown in the figure, the vehicle body 9 is transported by the coating transport line 10 while being mounted on a hanger. In the present embodiment, two dipping tanks 1 and 8 are provided along the coating transfer line 10, and a processing tank 1 (hereinafter referred to as degreasing chemical conversion treatment) for performing degreasing treatment and chemical conversion treatment on the upstream side in the conveying direction indicated by an arrow in the figure. Processing tank 1
Also called. ) And the downstream side is a rinse tank 8 for cleaning the treated body 9. The treatment tank 1 is filled with a degreasing / chemical conversion treatment liquid, and the rinse tank 8 is filled with pure water.

The degreasing / chemical conversion treatment liquid used in this example is a treatment liquid capable of performing three kinds of treatments such as degreasing treatment, surface conditioning and chemical conversion treatment in the same step. Examples of such a degreasing / chemical conversion treatment liquid include at least alcohol, glycol ether or diethylene glycol ether-based polar organic solvent, water, zinc ion, phosphate ion, manganese ion, nickel ion, and sodium ion. A treatment liquid containing it can be used. By using this treatment liquid, the degreasing process, the surface conditioning process, and the chemical conversion process can be performed simultaneously in one process, which greatly shortens the treatment process, simplifies the treatment equipment, saves space, and improves productivity. Improvement, reduction of drug cost,
It is possible to simplify drug management.

As shown in FIG. 1, in the present embodiment, the degreasing chemical conversion treatment tank 1 and the rinse tank 8 are installed at different heights in the vertical direction, and the rinse tank 8 is degreased and chemically converted. It is provided in different steps so that it is located higher than the processing tank 1. Further, a substantially flat inclined surface 31 is provided between the outlet of the degreasing chemical conversion treatment tank 1 and the inlet of the rinse tank 8 which are different in level.
The shape of the inclined surface 31 is not limited to the flat plane described above, and any shape may be used as long as the degreasing / chemical conversion treatment liquid flowing from the automobile body 9 passing through the inclined surface 31 flows into the degreasing chemical conversion treatment tank 1. For example, the shape may have a curved surface.

As described above, by installing the degreasing chemical conversion treatment tank 1 and the rinse tank 8 at different heights with respect to the vertical direction, as compared with the case where they are installed at the same height, the distance between the two dipping tanks is increased. It is possible to secure a long bath time and effectively remove dust particles such as iron powder attached to the automobile body 9. In addition, the degreasing and chemical conversion treatment liquid flowing down from the automobile body 9 is degreased by the inclined surface 31.
It is possible to reduce the usage amount of the degreasing / chemical conversion treatment liquid by returning to and circulating. The automobile body 9 transported while mounted on the hanger is the degreasing chemical conversion treatment tank 1
At the time of leaving the tank, the tank is taken out in an inclined state, and the state is maintained and moved in accordance with the slope of the inclined surface 31.
Entered the tank. With the car body tilted,
By moving it, the dust particles are removed more efficiently.

When the degreasing chemical conversion treatment tank 1 and the rinse tank 8 are installed at substantially the same height in the vertical direction, a long bath time between the two dipping tanks 1 and 8 is secured. In order to do so, a method of intermittently decelerating or stopping only the automobile body 9 conveyed between the two dipping tanks 1 and 8 without stopping the entire line can be considered. In addition, a method of mounting the vehicle body 9 that is transported between the two dipping tanks 1 and 8 on a hanger while inclining the vehicle body 9 is also possible.

Further, as shown in FIG.
1, a high pressure spray 32 (high pressure injection means) and a pouring nozzle 34 (outflow means) are provided around the automobile body 9 conveyed along the coating conveyance line 10. The high-pressure spray 32 is from 3.92 [MPa] to 5.8 from the upper side and the lateral direction with respect to the vehicle body 9 passing through the inclined surface 31 while being mounted on the hanger.
The degreasing / chemical conversion treatment liquid is injected at a high pressure of about 8 [MPa]. As a result, dust particles attached to the outside of the automobile body 9 are removed, and the quality of the coating on the outside of the automobile body 9 is improved. The degreasing / chemical conversion treatment liquid for the high-pressure spray 32 is supplied from the degreasing chemical conversion treatment tank 1 by a pump 33.

In addition, the pouring nozzle 34 provided on the inclined surface 31 is mounted on the hanger, and the inclined surface 3
1000 [l /
[min] of the degreasing / chemical conversion treatment liquid is poured. As a result, it is possible to further enhance the effect of removing dust particles accumulated inside the automobile body 9. The degreasing / chemical conversion treatment liquid to the pouring nozzle 34 is supplied from the degreasing chemical conversion treatment tank 1 by the pump 35.

The degreasing / chemical conversion treatment liquid injected by the high-pressure spray 32 and the degreasing / chemical conversion treatment liquid poured in by the pouring nozzle 34 are returned to the degreasing chemical conversion treatment tank 1 by the inclination of the inclined surface 31 and circulated. Used.

By installing the rinse tank 8 at a position higher than the degreasing chemical conversion treatment tank 1 in the vertical direction,
For example, the following method can be considered. That is, an inclined surface is provided between the two dipping tanks 1 and 8, and a high pressure spray for injecting pure water supplied from the rinse tank 8 by a pump is provided on the inclined surface. This makes it possible to enhance the cleaning effect of the automobile body 9 that has left the degreasing chemical conversion treatment tank 1 after the treatment, and the pure water is returned to the rinse tank 8 and circulated by the inclined surface.

As shown in FIG. 1, in the degreasing chemical conversion treatment tank 1, a circulation system in which the treatment liquid in the degreasing chemical conversion treatment tank 1 is sucked by the pump 14 and circulated so as to be returned to the degreasing chemical conversion treatment tank 1 again. 11 is provided, and the circulation system 11 is provided with a dust removing device 2, a chemical conversion sludge removing device 3, in order from the upstream side.
An oil removing device 4 is provided.

The dust removing device 2 removes dust particles such as iron powder contained in the treatment liquid in the degreasing chemical conversion treatment tank 1 and the cleaning liquid in the rinse tank 8. The removed dust particles are discarded and the dust particles are removed. The removed treatment liquid is sent to the next conversion sludge removing device 3. Specific devices that can be used as the dust removing device 2 of this example include a set ring tank, a centrifugal separator, and a magnet separator. Each will be described below.

As shown in FIG. 2, a set ring tank 21 as an example of the dust removing device 2 is provided with a partition plate 213 which meanders the flow path 212 in the tank 211, and enters from an inlet 214. The processing liquid is the partition plate 21.
3 meanders inside the tank and reaches the outlet 215. At this time, the rising speed of the treatment liquid is controlled to be lower than the sedimentation speed of dust particles such as iron powder, whereby dust particles such as iron powder are deposited on the bottom surface of the tank 211, and the treatment liquid can be cleaned. The settling tank 21 is inexpensive as a simple device and is effective for relatively heavy dust other than light dust floating in the treatment liquid.

As shown in FIG. 3, a centrifugal separator 22 as another example of the dust removing device 2 has a slit-shaped special separator provided in a tangential direction with a waste solution such as a processing liquid and iron powder that has entered from an inlet 221. It is accelerated by passing it through the rotation mechanism 222, and solid matter (dust particles) heavier than the liquid is centrifugally moved along the inner wall to the lower collection chamber 22.
3, while the solid content is discharged from the solid content outlet 224, the processing liquid is raised from the inner pipe 225 to be discharged from the processing liquid outlet 226.
Discharge from. This is an apparatus for cleaning the processing liquid.

As shown in FIG. 4, a magnet type separator 23 as another example of the dust removing device 2 introduces a treatment liquid from an inlet 232 while rotating a drum 231 containing a magnet in a direction of an arrow in the figure. , This processing liquid is drum 23
This is a device for removing magnetic dust particles such as iron when passing through the flow path 233 in contact with 1. Drum 231
The dust particles adhered by the magnetic force are scraped off by the scraper 234, while the treatment liquid from which the dust particles have been removed is discharged from the outlet 235.

The above-mentioned dust removing devices 21, 22,
23 can be used alone or in combination, and in particular, a combination of the set ring tank 21 and the magnet type separator 23 has a high dust trash removal rate and is most preferable.

However, the dust removing means according to the present invention is not limited to the above-mentioned three forms, and includes other forms. Further, the dust removing device 2 of the present example is provided in the circulation system 11, but the dust removing means according to the present invention is provided in the circulation system 11 and also provided inside or outside the degreasing chemical conversion treatment tank 1 itself. is there.

Returning to FIG. 1, the conversion sludge removing device 3 is
The chemical conversion sludge contained in the treatment liquid that has passed through the dust removing device 2 is removed. The removed chemical conversion sludge is discarded, and the treatment liquid from which the chemical conversion sludge has been removed is sent to the next oil content removing device 4. . The chemical conversion sludge removing device 3 is not particularly limited as long as the sludge concentration of the treatment liquid in the degreasing chemical conversion treatment tank 1 shown in FIG. 1 is suppressed to within 150 ppm and does not contaminate the treatment liquid. It can be used without being used.

The oil content removing device 4 removes the oil content contained in the processing liquid that has passed through the chemical conversion sludge removing device 3 described above. The removed oil content is discarded, and the processing liquid from which the oil content has been removed is It is sent to the replenishment tank 6 and the water-polar organic solvent separator 5.

Examples of the oil removing device 4 that can be used in the present invention include a heating type oil removing device, a coalescer type oil removing device, and an ultrafiltration type oil removing device. Of these, the heating type oil removal device is preferably applied to an aqueous solution containing a nonionic surfactant as a degreasing component, and when it is heated to a specific temperature or higher, it becomes insoluble in water itself, It is an oil removal device that utilizes the characteristics of nonionic surfactants, such as oil-water separation into two phases, an oil phase composed of a nonionic surfactant and an aqueous phase.

Further, the coalescer type oil removing device enlarges the oil droplets by destroying the water-oil emulsion by passing the oil droplets dispersed in the aqueous solution in a size of several μm through the filter. It is an oil removal device that can be grown and floated and collected.

The ultrafiltration type oil removing device uses ultrafiltration, that is, a filter having a mesh of about 0.01 to 0.001 μm and a low pressure of about 0.5 to 5 × 10 ⁻⁵ Pa. It is an oil removal device using a filtration method in which colloidal particles are separated from a solvent by pressurization or suction filtration.

These oil removing devices 4 can be used alone or in combination, depending on the required degree of oil-water separation.

As shown in FIG. 1, a treatment liquid replenishing tank 6, a water-polar organic solvent separating device 5 and an ion removing device 7 are provided on the downstream side of the oil removing device 4 of the circulation system 11.

The treatment liquid replenishing tank 6 passes through the dust removing device 2, the chemical conversion sludge removing device 3 and the oil content removing device 4 to temporarily store the degreasing chemical conversion treatment liquid from which dust particles, chemical conversion sludge and oil have been removed. In addition to this, a polar organic solvent from which water has been removed by a water-polar organic solvent separator 5 to be described later and water from which ionic components have been removed by an ion remover 7 are supplied. Then, a new degreasing / chemical conversion treatment liquid is replenished and adjusted by the pump 16 from the processing liquid tank 15 containing the new degreasing / chemical conversion treatment liquid, and returned to the degreasing / chemical conversion treatment tank 1.

The water-polar organic solvent separating device 5 separates the water component and the polar organic solvent component from the treatment liquid that has passed through the oil removing device 4, and the separated water component is supplied to the ion removing device 7. The separated polar organic solvent component is supplied to the treatment liquid supply tank 6.

The polar organic solvent contained in the degreasing / chemical conversion treatment liquid used in this example is an alcohol, glycol ether or diethylene glycol ether system as described above, and the water-polar organic solvent separator 5 of this example is used. As such, it is desirable to use a method capable of efficiently and inexpensively separating these polar organic solvents from water. Examples of such a separation method include a separation method called pervaporation. As shown in FIG. 5, a separation membrane 51 (non-porous membrane: a membrane having pores of 1 nm or less) 52 having selective permeability is provided on one side (supply side) 52 of a polar organic solvent to be separated and water. The mixed liquid is supplied as it is, and the other side (permeation side) 53 of the separation membrane 51 is evacuated or reduced. Then, using the pressure difference between the supply side 52 and the permeation side 53 as the driving force, the high pressure side (supply side) 52 to the low pressure side (permeation side) 5
When the mixed liquid is moved to 3, the polar organic solvent and the water are separated by interposing the separation membrane 51 having the selective permeability, which has a significantly different diffusion rate for each substance type.

As the above-mentioned separation membrane 51, "a composite membrane having a PVA membrane cross-linked with maleic acid on a support membrane (Japanese Patent Laid-Open No. 59-109204)", "treated with K salt,
Mixed film of 80% carboxymethyl cellulose and 20% polyacrylate (J. Memb. Sci., 32, 20)
7 (1987) "," PVA crosslinked on PNA support membrane "
Composite membrane on membrane (J. Memb. Sci., 36, 4
63 (1988) "," Chitosan derivative hollow fiber membrane (Nikkakai (1989)) "," Cobalt alginate membrane (JP-A-61-404) "," Chitosan sulfate membrane (International Membrane Society ( 1987)) "," Polyion complex composite film of polyacrylic acid obtained by hydrolyzing the surface of PNA-based film and ionene-type polycation (JP-A 1-2240).
No. 03) ”and the like.

The ion removing device 7 removes the ionic component from the water component supplied from the water-polar organic solvent separating device 5, the removed ionic component is discarded, and the remaining water is the treatment liquid replenishing tank 6. And are supplied to the rinse tank 8. The ion removing device 7 used in this example is not a special one, and as shown in FIG. 6, a chelating resin capable of removing cation components contained in the degreasing / chemical conversion treatment liquid, such as zinc ions, nickel ions, and manganese ions. Type ion exchange column 71 filled with a cation exchange resin, and an ion exchange filled with a styrene-based strongly basic anion exchange resin capable of removing anion components contained in the degreasing / chemical conversion treatment liquid, such as phosphate radicals and nitrate radicals. An ion exchange column 73 that is equipped with a column 72 and is filled with H-type strongly acidic cation exchange resin, which is a pure water production apparatus that is usually used to increase the purity of water.
And a decarbonation tower 74 and an anion exchange tower 75 filled with an OH type styrene-based strongly basic anion exchange resin.

The pretreatment apparatus for coating of this example has the above-mentioned constitution and is provided with the following five circulation systems. As shown in FIG. 1, first, in the first circulation system 11, the processing liquid in the degreasing chemical conversion treatment tank 1 is degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil content removing device 4 → processing It is a circulation system that circulates from the liquid replenishment tank 6 to the degreasing chemical conversion treatment tank 1. This corresponds to the first circulation system according to claim 1.

In the second circulation system 12, the treatment liquid in the degreasing chemical conversion treatment tank 1 is the degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil content removing device 4 → water-polar organic solvent separation It is a circulation system that circulates from the device 5 to the ion removal device 7 to the rinse tank 8. This corresponds to the second circulation system described in claim 4.

The third circulation system 13 guides the liquid in the rinse tank 8 to the dust removing device 2 by the pipe 17 and the pump 18, and thereafter, the dust removing device 2 → chemical conversion sludge removing device 3 → oil content removing device 4 It is a circulation system that circulates. This corresponds to the third circulation system described in claim 7.

In addition to this, the following circulation system is constructed.

As the fourth circulation system 111, the above-mentioned first circulation system 11, that is, degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil content removing device 4 → treatment liquid supply tank 6 → A water-polar organic solvent separator 5 is added to the closed circuit of the degreasing chemical conversion treatment tank 1, and the polar organic solvent separated by the water-polar organic solvent separator 5 is supplied to the treatment liquid replenishment tank 6 in a circulation system. is there. This corresponds to the circulatory system described in claim 3.

As the fifth circulation system 121, the above-mentioned second circulation system 12, that is, degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil removing device 4 → water-polar organic solvent separation Circulation in which the treatment liquid replenishing tank 6 is added to the closed circuit of the device 5 → ion removing device 7 → rinsing tank 8 and a part of the pure water from which the ions have been removed by the ion removing device 7 is supplied to the treatment liquid replenishing tank 6. It is a system. This corresponds to the circulatory system of claim 5.

As the sixth circulation system 131, the above-mentioned third circulation system 13, that is, the rinse tank 8 and the degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil content removing device 4 → treatment liquid The water-polar organic solvent separator 5 is added to the closed circuit of the replenishing tank 6 → the degreasing chemical conversion treatment tank 1, and this water-
This is a circulation system for supplying the polar organic solvent separated by the polar organic solvent separator 5 to the treatment liquid replenishing tank 6. This corresponds to the circulatory system of claim 8.

As the seventh circulation system 132, the sixth circulation system 131 described above, that is, the rinse tank 8 and the degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil content removing device 4 → water- A polar organic solvent separator 5 → treatment liquid replenishing tank 6 → a degreasing chemical conversion treatment tank 1 has a closed circuit provided with an ion removing device 7 to remove ions from the water separated by the water-polar organic solvent separating device 5, This is a circulation system that supplies water from which ions have been removed to the rinse tank 8. This is claim 9
Corresponds to the described circulatory system.

As the eighth circulation system 133, the above-mentioned sixth circulation system 131, that is, the rinse tank 8 and the degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil content removing device 4 → Water-polar organic solvent separator 5-> treatment liquid replenishing tank 6-> degreasing chemical treatment tank 1 is provided with an ion removing device 7 in the closed circuit to remove ions from the water separated by the water-polar organic solvent separator 5. Then, it is a circulation system for supplying the water from which the ions have been removed to the treatment liquid replenishing tank 6. This corresponds to the circulation system according to claim 10.

As described above, the pretreatment apparatus of this embodiment is
It has three circulation systems, first to third when roughly classified, and eight circulation systems when further classified, so that the composition of the treatment liquid in the degreasing chemical conversion treatment tank 1 is stabilized, and there is no quality variation even in continuous treatment. Allows the formation of treated coatings.

Further, by having the third circulation system, the electric conductivity of the wash water in the rinse tank 8 is kept within the range of 20 μS / cm or less, and oil particles, the treatment liquid, and dust particles such as iron are deposited on the surface of the treatment object. Adhesion can be prevented, and the carry-out to the next process can be reduced as much as possible.

Second Embodiment FIG. 7 is a view showing another embodiment of the coating pretreatment apparatus of the present invention, and FIG. 8 is a conceptual view showing a vacuum distillation apparatus according to this embodiment.

In the pretreatment apparatus of this embodiment, the dust removing apparatus 2, the chemical conversion sludge removing apparatus 3, the oil removing apparatus 4, the water-polar organic solvent separating apparatus 5 and the ion removing apparatus 7 of the first embodiment described above are replaced. A vacuum distillation apparatus 20 is provided.

The treatment liquid in the degreasing chemical conversion treatment tank 1 and the liquid in the rinse tank 8 are sucked by the pump 14 and the pump 18, respectively, and supplied to the vacuum distillation apparatus 20, where the polar organic solvent, water and other The substance is separated. The polar organic solvent separated by the vacuum distillation apparatus 20 is used as the processing liquid replenishment tank 6
Is supplied to the treatment liquid replenishing tank 6, and the remaining water is supplied to the rinse tank 8.

The substances other than the polar organic solvent and water separated by the vacuum distillation apparatus 20 are dust particles such as iron powder, chemical sludge and oil, and these sludges are vacuum distillation apparatus 2
Discarded from 0.

FIG. 8 shows a conceptual diagram of the vacuum distillation apparatus 20.
Vacuum distillation is, for example, several tens to ten. ^-2About Torr
It is a method of distilling at a low pressure and lowering the boiling point. In this example
Want to separate the polar organic solvent and water separately from the treatment liquid
Therefore, as shown in FIG.
02 is provided. Both have the same structure, and the treatment liquid
The device main body 203 to be supplied has
Is depressurized by the vacuum pump 204. Also, the device book
Heater 20 for raising the temperature inside the body 203 to a predetermined temperature
5 is provided, which leads to the inside of the apparatus main body 203.
The processing liquid is heated under reduced pressure and its heating temperature
By setting the boiling point of the target substance to
Only the quality is evaporated and guided to the evaporation pipe 206, and the cooler 207
Liquefy by.

As described above, in this example, since it is desired to separate the polar organic solvent and the water separately from the treatment liquid, only the polar organic solvent is separated by the first-stage vacuum distillation apparatus 201 shown in FIG. It is supplied to the processing liquid replenishment tank 6 shown in FIG. In the next-stage vacuum distillation apparatus 202, only water is separated from the processing solution remaining in the previous vacuum distillation apparatus 201, and this is supplied to the processing solution replenishing tank 6 and the rinse tank 8 shown in FIG. 7. Then, the sludge such as dust, chemical sludge and oil remaining in the vacuum distillation apparatus 202 is discarded here.

Since the boiling point is low in the reduced pressure state, the heat energy supplied to the heater 205 is smaller than that in the atmospheric distillation. Especially as the energy of the heater 205,
It is desirable to use waste heat from the paint drying oven.

According to the pretreatment apparatus of the present embodiment, the liquid in the treatment tank 1 and the rinse tank 8 can be recovered and regenerated only by the vacuum distillation apparatus 20, and the entire system can be simplified as compared with the first embodiment. The cost can be reduced.

Incidentally, also in this example, as in the case of the above-described first embodiment, the rinse tank 8 is provided in a stepped manner so as to be located higher than the degreasing chemical conversion treatment tank 1, and the inclined surface 31 is provided between them. ing. Further, on the inclined surface 31, a high pressure spray 32 (high pressure injection means) and a pouring nozzle 34 (outflow means) are provided around the automobile body 9 conveyed along the coating conveyance line 10. Cage, high pressure spray 32 and pouring nozzle 3
The degreasing and chemical conversion treatment liquid in the degreasing chemical conversion treatment tank 1 is supplied to 4 by pumps 33 and 35, respectively. As a result, it becomes possible to effectively remove dust particles such as iron powder adhering to the automobile body 9, and the degreasing / chemical conversion treatment liquid flowing down from the automobile body 9 is returned to the degreasing chemical conversion treatment tank 1 by the inclined surface 31, By circulating it, it is possible to reduce the amount of the degreasing / chemical conversion treatment liquid used.

The embodiments described above are described for facilitating the understanding of the present invention, and not for limiting the present invention. Therefore, each element disclosed in the above-described embodiment is intended to include all design changes and equivalents within the technical scope of the present invention.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a coating pretreatment apparatus of the present invention.

FIG. 2 is a perspective view and a cross-sectional view showing an embodiment of the dust removing device of FIG.

FIG. 3 is a perspective view showing another embodiment of the dust removing device of FIG.

FIG. 4 is a cross-sectional view showing still another embodiment of the dust removing device of FIG.

5 is a conceptual diagram showing an embodiment of the water-polar organic solvent separator of FIG.

FIG. 6 is a conceptual diagram showing an embodiment of the ion removing apparatus of FIG.

FIG. 7 is a diagram showing a second embodiment of the coating pretreatment apparatus of the present invention.

8 is a conceptual diagram showing an embodiment of the vacuum distillation apparatus of FIG.

[Explanation of symbols]

1 ... Degreasing chemical conversion treatment tank (treatment tank) 2 ... Dust removal device (dust removal means) 3 ... Chemical conversion sludge removal device (chemical conversion sludge removal means) 4 ... Oil content removal device (oil content removal means) 5 ... Water-polar organic solvent separation Apparatus (water-polar organic solvent separating means) 6 ... Treatment liquid replenishing tank (treatment liquid replenishing means) 7 ... Ion removing device (ion removing means) 8 ... Rinse tank

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 17/04 501 B01D 17/04 501D 4K053 503 503Z B01J 45/00 B01J 45/00 H 47/02 47 / 02 A B03C 1/00 B03C 1/00 A 1/12 1/12 B05C 3/09 B05C 3/09 9/10 9/10 C02F 1/02 C02F 1/02 Z 1/38 1/38 9/00 502 9/00 502A 502D 502G 502J 502Z 503 503C 504 504B 504E C23C 22/12 C23C 22/12 22/73 22/73 A C23G 3/00 C23G 3/00 B Z F term (reference) 4D034 AA11 CA01 4D037 AA11 AB06 BA28 CA02 CA03 CA05 CA15 4F040 AA13 AB13 AB20 AC02 BA42 CC03 CC10 CC11 DB04 DB10 DB22 4F042 AA09 DA01 DA02 DA08 DA10 4K026 AA02 BA04 CA23 DA12 DA19 4K053 PA02 PA18 QA06 RA07 SA06 TA08 XA15 XA24 XA38 YA06 YA07 YA10 YA13

Claims (27)

[Claims] 1. A pretreatment device for coating, which performs degreasing treatment, surface conditioning treatment, and chemical conversion treatment on an object to be coated, the first dipping bath and a second dipping bath adjacent to the first dipping bath. And at least one of the first dipping tank and the second dipping tank is provided in a position higher in the vertical direction than the other of the first dipping tank or the second dipping tank Pretreatment equipment. 2. The coating pretreatment apparatus according to claim 1, wherein an inclined surface is provided between the outlet side of the first dipping tank and the inlet side of the second dipping tank. 3. The pre-coating apparatus according to claim 1 or 2, wherein the object to be coated is inclined while moving from the first dipping tank to the second dipping tank. Processing equipment. 4. The second dipping tank is provided at a position higher in the vertical direction than the first dipping tank, and the fluid filled in the first dipping tank is sucked to apply the coating liquid. Outflow means for outflowing the fluid to the inside of the article is provided, wherein the outflow means includes the first dipping tank and the second dipping tank.
The coating pretreatment apparatus according to claim 2 or 3, which is provided on the inclined surface between the dipping tank and the dipping tank. 5. A high-pressure jetting unit for sucking the fluid filled in the first dipping tank and jetting the fluid at a high pressure to the outside of the object to be coated, wherein the high-pressure jetting unit is the first unit. The pre-coating treatment apparatus according to claim 4, which is provided on the inclined surface between one dipping tank and the second dipping tank. 6. The first dipping tank is provided at a position higher in the vertical direction than the second dipping tank, and the fluid filled in the second dipping tank is sucked to apply the coating liquid. The coating according to claim 2 or 3, further comprising: a high-pressure injection means for injecting an object with a high pressure, wherein the high-pressure injection means is provided on the inclined surface between the first dipping tank and the second dipping tank. Pretreatment equipment. 7. The first dipping bath is a treatment bath filled with a degreasing / chemical conversion treatment liquid, and the second dipping bath is provided in a subsequent stage adjacent to the treatment bath and filled with a cleaning liquid. A first circulation system that is a rinse tank and sucks the degreasing / chemical conversion treatment liquid in the processing tank and returns it to the processing bath; dust removing means for removing dust contained in the degreasing / chemical conversion treatment liquid; A chemical conversion sludge removing unit that is provided in a first circulation system and removes the chemical conversion sludge contained in the degreasing / chemical conversion treatment liquid; an oil content removing unit that removes oil contained in the degreasing / chemical conversion treatment liquid; 7. A processing liquid replenishing tank, which is provided in the circulation system, adjusts the liquid that has passed through the dust removing means, the chemical conversion sludge removing means, and the oil content removing means and replenishes the liquid to the processing tank. Pretreatment for painting described in any Apparatus. 8. The coating pretreatment apparatus according to claim 7, wherein the dust removing means and the oil removing means are provided in the first circulation system. 9. Water-polarity for separating a water component of a liquid passed through the dust removing means, the chemical sludge removing means and the oil content removing means from a polar organic solvent and supplying the polar organic solvent component to the treatment liquid replenishing tank. 9. The coating pretreatment apparatus according to claim 7, further comprising an organic solvent separating means. 10. The first dipping bath is a treatment bath filled with a degreasing / chemical conversion treatment liquid, and the second dipping bath is provided in a subsequent stage adjacent to the treatment bath and filled with a cleaning liquid. A rinse tank, a second circulation system that sucks the degreasing / chemical conversion treatment liquid in the processing tank and supplies it to the rinse tank, and a dust removing unit that removes dust contained in the degreasing / chemical conversion treatment liquid, A chemical conversion sludge removing unit provided in the second circulation system for removing the chemical conversion sludge contained in the degreasing / chemical conversion treatment liquid; an oil content removing unit for removing an oil component contained in the degreasing / chemical conversion treatment liquid; Water-polar organic solvent separating means for separating the water component in the degreasing / chemical conversion treatment liquid and the polar organic solvent, provided in the second circulation system; and the water-polar organic solvent provided in the second circulation system. Separation by means of solvent separation An ion removing means for removing an ionic component from the water component, and returning the residual water to the rinse tank;
The coating pretreatment apparatus according to any one of claims 1 to 6, further comprising: 11. The treatment liquid replenishing tank for replenishing the degreasing / chemical conversion treatment liquid to the treatment tank, wherein at least a part of the water obtained by the ion removing means is supplied to the treatment liquid replenishing tank. Pretreatment equipment described. 12. The coating pretreatment apparatus according to claim 10, wherein the dust removing means and the oil removing means are provided in the second circulation system. 13. The first dipping bath is a treatment bath filled with a degreasing / chemical conversion treatment liquid, and the second dipping bath is provided in a subsequent stage adjacent to the treatment bath and filled with a cleaning liquid. A first circulation system that is a rinse tank and that sucks the degreasing / chemical conversion treatment liquid in the treatment tank and returns it to the treatment tank, and removes dust contained in the circulation liquid provided in the first circulation system. Dust removing means, chemical conversion sludge removing means provided in the first circulation system for removing the chemical conversion sludge contained in the circulating liquid, and oil removal contained in the circulation liquid provided in the first circulating system. An oil removing means, a treatment liquid replenishing tank which is provided in the first circulation system, adjusts the liquid that has passed through the dust removing means, the chemical conversion sludge removing means, and the oil removing means, and replenishes the treatment tank with the treatment liquid; Aspirate the liquid in the rinse tank A third circulation system for leading to the most upstream means of the dust removing means, the chemical conversion sludge removing means, and the oil content removing means, and the coating pretreatment apparatus according to any one of claims 1 to 6. 14. Water-polarity for separating a water component of a liquid passed through said dust removing means, a chemical sludge removing means and an oil content removing means from a polar organic solvent and supplying the polar organic solvent component to said treatment liquid replenishing tank. The coating pretreatment apparatus according to claim 13, further comprising an organic solvent separating means. 15. The pre-coating treatment according to claim 14, further comprising ion removing means for removing an ionic component from the water component separated by said water-polar organic solvent separating means and returning the remaining water to said rinse tank. apparatus. 16. At least a part of the water obtained by the ion removing means is supplied to the treatment liquid replenishing tank.
5. The pretreatment device for coating according to 5. 17. The first dipping bath is a treatment bath filled with a degreasing / chemical conversion treatment liquid, and the second dipping bath is provided in a subsequent stage adjacent to the treatment bath and filled with a cleaning liquid. A rinse tank, which is provided in the second circulation system for sucking the degreasing / chemical conversion treatment liquid in the processing tank and supplying the degreasing / chemical conversion treatment liquid to the rinse tank, and being included in the degreasing / chemical conversion treatment liquid Dust removing means for removing dust to be formed, chemical conversion sludge removing means provided in the second circulation system for removing chemical conversion sludge contained in the degreasing / chemical conversion treatment liquid, and provided in the second circulation system, An oil removing means for removing oil contained in the degreasing / chemical conversion treatment liquid; and a water-polar organic substance provided in the second circulation system for separating a water component in the degreasing / chemical conversion treatment liquid from a polar organic solvent. Solvent separation means, and the second An ion removing unit provided in the circulation system, which removes an ionic component from the water component separated by the water-polar organic solvent separating unit and returns the remaining water to the rinse tank, and sucks the liquid in the rinse tank. A third circulation system for leading to the most upstream means of the dust removing means, the chemical conversion sludge removing means, and the oil content removing means, and the coating pretreatment apparatus according to any one of claims 1 to 6. 18. A pretreatment apparatus for coating according to claim 17, further comprising a treatment liquid replenishing tank for adjusting the liquid that has passed through the dust removing means, the chemical sludge removing means and the oil content removing means to replenish the treatment tank. . 19. The coating pretreatment apparatus according to claim 18, wherein the polar organic solvent separated by the water-polar organic solvent separating means is supplied to the treatment liquid replenishing tank. 20. At least a part of the water obtained by the ion removing means is supplied to the treatment liquid replenishing tank.
The coating pretreatment apparatus according to 8 or 19. 21. The coating pretreatment apparatus according to claim 7, wherein the dust removing means comprises a settling tank, a centrifugal separator, and a magnet separator alone or in combination. 22. The chemical conversion sludge removing means adjusts the sludge concentration of the degreasing / chemical conversion treatment liquid in the treatment tank to 150 ppm.
The following is provided with a controllable full-volume filter.
22. The pretreatment device for coating according to any one of 21. 23. The oil removing device according to claim 7, wherein the oil removing device comprises a heating oil removing device, a coalescer oil removing device, and an ultrafiltration oil removing device alone or in combination. Pretreatment equipment for painting. 24. The coating pretreatment apparatus according to claim 9, wherein the water-polar organic solvent separating means separates the water component and the polar organic solvent by a pervaporation method. 25. The ion removing means comprises a cation exchange column filled with a cation exchange resin a, an anion exchange column filled with an anion exchange resin b, and a cation exchange resin c.
The pretreatment apparatus for coating according to any one of claims 10 to 12 and 15 to 24, which comprises an ion exchange tower filled with the above and a decarbonation tower. 26. The cation exchange resin a is a chelate type cation exchange resin, the anion exchange resin b is a styrene type strong basic anion exchange resin, and the cation exchange resin c is a styrene type strong acid. 26. The pretreatment apparatus for coating according to claim 25, which is a cationic cation exchange resin. 27. The degreasing / chemical conversion treatment liquid is alcohol,
The coating according to any one of claims 7 to 26, which contains at least a glycol ether or diethylene glycol ether-based polar organic solvent, water, zinc ions, phosphate ions, manganese ions, nickel ions, and sodium ions. Pretreatment equipment.