JPS5891199A - Electrodeposition painting device - Google Patents

Abstract

PURPOSE:To minimize the change in the compsn. of electrodepositing paint and to supply the electrodeposition painted products of consistent quality stably in continuous electrodeposition painting by providing a line which decreases the pH of the electrodeposition paint of high pH in the cathode area in a bath tank to low pH by ion exchanging. CONSTITUTION:The inside of an electrodeposition painting bath tank 1 is segmented to an anode area 4 and a cathode area 5 by means of a masking material 3. In the stage of performing electrodeposition painting continuously, the electrodepositing paint (cathode paint soln.) of high pH is drawn out to the outside of the tank 1 from the desired position in the area 5, and is stored in a storage tank 6 for the cathode painting soln. The stored soln. is transferred into an ion exchanging device 7, where the soln. is subjected to an ion exchanging treatment to the electrodeposition paint of low pH which is transferred into a preliminary tank 8 or the area 4 of the tank 1. If necessary, an ultrafilter 9 is installed in the line before application of the ion exchanging treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrodeposition coating device.More specifically, it is possible to maintain extremely slight changes in the composition of the paint in the electrodeposition coating bath even through continuous electrodeposition coating. The present invention relates to an electrodeposition coating device that can consistently and consistently produce coated products of consistent quality.

Conventionally, when metal articles are continuously electrocoated, the composition of the paint in the electrocoating bath changes, making it impossible to obtain a coated product of constant quality. Various apparatuses have been proposed to overcome this drawback. For example, electrodeposition coating bath g = ion exchange treatment equipment limit! Apparatuses for treating lightning coating paints either singly or in combination are known.

However, even when these devices are used, changes in the composition of the electrodeposition paint can be effectively suppressed, and the changes can be kept to a very small level.
It has not been possible to consistently produce superior painted products.

The present invention provides an electrocoating device that can maintain extremely small changes in the composition of electrocoated paint, which is extremely difficult with the conventional electrocoating devices, and can stably supply electrocoated products of constant quality. The purpose is to

The electrodeposition coating apparatus of the present invention will be explained based on the drawings. The interior of the electrodeposition coating bathtub is divided by a masking material 3 into an anode zone ≠ and a cathode zone j.

According to the inventor's experiments, if continuous electrodeposition coating is continued, the cathode zone! It was revealed that the pH of the electrodeposited paint was much higher than that of the anode band 6.

This high-pH electrodeposition paint (hereinafter referred to as cathode coating liquid) is taken out of the electrodeposition coating bath from any position within the cathode zone≠ by any method, and stored in the cathode coating liquid storage tank 6 through a conduit.

Next, the axillary liquid is transferred to the ion exchange treatment device 7 through a conduit and subjected to 1 ion exchange treatment to form a low pH lightning paint.
It is transferred through a conduit to the anode zone j of the pre-tank or/and electrocoating bath.

The cathode coating liquid can also be directly transferred to the ion exchange treatment device 7 through a conduit without being stored in the storage tank 6.

The main purpose of the ion exchange treatment device 7 is to use a cation exchange resin to remove cations from the cathode coating liquid and make it a low pH passing liquid, but it can also be used in combination with an anion exchange resin (
mixture or combination).

The electrodeposition coating apparatus of the present invention is characterized by being provided with the treatment system path as described above, but it is also preferable to further combine it with an ultrafiltration apparatus. For the ultrafiltration device, just install electricity in the thread path before the cathode coating liquid is subjected to ion exchange treatment.
When the cathode coating liquid is subjected to ultrafiltration treatment, the concentrated liquid and the permeated liquid are separated into two parts, and the concentrated liquid is returned to the cathode coating liquid (1114) or (and) the anode band of the electrodeposition coating bath and the L1 permeated liquid is subjected to ion exchange treatment. A conduit may be provided so that it can be transferred to 7. - As a result of this ultrafiltration treatment, the cations and anions in the cathode coating liquid are contained in the permeate, so if this is subjected to ion exchange treatment, the same effect as when no ultrafiltration is performed can be obtained.

Furthermore, since the permeate has almost all of the resin solid content in the paint removed, it has the advantage of being extremely unlikely to cause clogging during ion exchange treatment.

Note that the transfer means in the above explanation is a pump (not shown).
It is appropriate to use

As explained above, the electrodeposition coating apparatus of the present invention is characterized by being provided with the above-mentioned thread path, and performs ion exchange treatment on the electrodeposition paint in the high pH cathode zone. , and low pH obtained by ion exchange treatment.
Since the liquid passing through is returned to the anode zone of the electrocoating bath with or without storing it in the reserve tank j, it is possible to efficiently suppress the composition of the electrocoating bath that changes due to continuous electrocoating. If the change can be kept extremely small, and as a result, coated products of constant quality can be stably manufactured, one excellent effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are diagrammatic configuration explanatory views of an embodiment showing the yarn path of the electrodeposition coating apparatus of the present invention, and are partially sectional views. l...Electrodeposition coating bathtub λ...Cathode 3...Masking ≠...
...Anode band! ...Cathode band t
... Z: - Cathode coating liquid storage tank 7 ... Ion exchange treatment device r ... Reserve tank ... Ultrafiltration device original person for patent Honey Kasei Co., Ltd.

Claims (1)

[Scope of Claims] / (a) An electrodeposition coating bathtub divided into an anode zone and a cathode zone by a masking material that transmits resin inside the bathtub, (b) #polar coating liquid storage oval, (C) consisting of an ion exchange treatment device and (d) a reserve tank; sending the cathode coating liquid from the cathode zones of (&) to the cathode coating liquid storage tank of (9);
The cathode coating liquid from the storage tank (t) is transferred to the ion exchange treatment device (C) L, and the low pH passing liquid from (Q) is transferred to the ion exchange treatment device (C) ((1).
1. An electrocoating apparatus, characterized in that it is provided with a thread path for transporting it to the preparatory tank of () or the anode zone of the electrocoating bath of (a). 2(a) An electrodeposition coating bathtub in which the interior of the electrodeposition coating bathtub is divided into an anode zone and a cathode zone using a masking material that allows resin to pass through;
(To) Cathode coating liquid storage tank, (C) Ion exchange treatment device, (
d) a preliminary tank and (8) an ultrafiltration device;
The cathode coating liquid from the cathode zone of ) is sent to the cathode coating liquid storage tank of (1)), and the cathode coating liquid from the storage tank of (1)) is fed to the cathode coating liquid storage tank of (1)).
The thickened liquid that does not pass through the ultrafiltration device (1) is transferred to the storage tank (to) or (and) the anode zone (a), and the permeated liquid is transferred to the ion exchange treatment device (C). , (C) to the pre-tank of (L) or (and) (a
1.) Electrodeposition coating equipment, characterized in that it is provided with a thread path for transporting it to the anode zone of the electrodeposition coating bath.