JPH01172595A - Electrodeposition coating device - Google Patents

Abstract

PURPOSE:To simplify a process and to improve operation efficiency, of an electrodeposition coating process by arranging materials to be coated in an electrodeposition bath in such a manner that a principal surface of the material to be coated is disposed parallel to each other and arranging also an electrode to be used as counter electrode to a position perpendicular to the principal surface of the material to be coated. CONSTITUTION:An electrodeposition bath 1 is constructed to a box-shaped form having an upper part opened to atmospheric air and an overflow tank 2 is formed at a side of the electrodeposition bath. An electrodeposition soln. 3 contg. a photosensitive resin compsn. dispersed therein is stored in the electrodeposition bath 1, and an electrode plate 4 serving as a counter electrode of the material 5 to be coated is disposed along an internal wall of the electrodeposition bath. Further, a rocking device capable of moving the material 5 toward all directions, namely, forward, backward, leftward, right ward, upward, and downward, etc., is provided permitting optional movement only in a necessary direction. Thus, uniform films are formed on the inside surface of holes or on projected or recessed surfaces. Moreover, the transportation is facilitated if a tool such as lac basket, etc., is used so as to arrange all principal surfaces of the material 5 to be coated to be parallel to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides an electro-deposition coating system which is particularly applicable to electro-rf coating which effectively deposits an electrode-deposited film and improves the uniformity of the electrode-deposited film. It is related to the device.

This electrodeposition coating apparatus forms an electrodeposition composition film on a plate-shaped object to be coated, particularly a printed wiring board.

(Prior Art) Conventionally, in the production of printed wiring boards, as a method of forming an electrodeposited composition film, the main surface of the object to be coated and the opposite electrode were in a parallel relationship. In addition, a large distance between the electrodes had to be maintained in order to obtain a good finish of the coating film.

Therefore, in order to increase production capacity, it is necessary to increase the number of electrodeposition baths.The only option is to increase the capacity of the bath, which increases the amount of expensive electrodeposition liquid per unit area of the printed wiring board, which is very uneconomical. Ta.

In addition, the electrodeposition solution is subjected to a turnover method to replenish the consumed electrodeposition resin composition, etc., so that the solid content in the electrodeposition solution is reduced to 10%.
Since 0% is used, the time for one turnover becomes longer as the amount of liquid per medium area of the substrate increases. In addition, when the production capacity is increased, the amount of electrodeposition liquid increases, making it difficult to manage the liquid, and the installation costs are also considerable. Furthermore, the longer the time for one turnover, the more the electrodeposition solution deteriorates, making it impossible to obtain a good coating film.

If the deterioration of the electrodeposition solution progresses in this manner, a situation arises in which the electrodeposition solution must be completely discarded.

In particular, when a photosensitive electrodeposition liquid is used, the deterioration of the electrodeposition liquid is more severe and this problem becomes even more serious.

(Problems to be solved by the invention) The present invention has been made in view of the above-mentioned circumstances, and the problems to be solved are: The amount of electrodeposition liquid per area is large.

■As a result, the turnover time becomes longer and the deterioration of the electrodepositing solution progresses.

(2) There is a very high possibility that the electrodeposition solution will have to be completely discarded.

It is.

The purpose of the present invention is to eliminate and improve the problems of the prior art described above and simplify the process.1 Electrodeposition coating device that can improve work efficiency and reduce manufacturing costs. It is.

(Means for Solving the Problems) The present invention has been made to solve the problems of the prior art and to achieve the objects listed in (5) above.

The method taken by the present invention to solve these problems is to immerse a plate-shaped object to be coated in an electrodeposition liquid in which an electrodepositable resin composition is dispersed, and to mix the electrodeposition liquid and the object to be coated. In an electrodeposition coating bag that forms a coating film on the surface of the object to be coated by applying electricity, a) the objects to be coated are arranged in the electrodeposition bath so that the main surfaces of the objects to be coated are arranged in parallel, and b) An electrodeposition coating apparatus characterized in that the if electrode, which serves as the opposite electrode, is disposed at a position perpendicular to the main surface of the object to be coated.

The present invention will be explained in detail using drawings corresponding to embodiments.

As shown in FIG. 1, the electrodeposition bath (1) is formed into a box shape with an open L portion, and an overflow tank (2) is formed on the side of the electrodeposition bath (1). In the electrodeposition bath, a photosensitive resin composition or a dispersed electrodeposition liquid (co) is stored, and an electrode plate (4) serving as a counter electrode to the object to be coated (5) is placed along the inner wall.
) or are arranged. Furthermore, in order to uniformly stir the liquid in the bath, one or more systems of nozzles for discharging the electrodeposition liquid are installed in the bath, and nozzles of arbitrary diameters are arranged depending on the location in the bath to keep the liquid composition uniform. Can be done. Also, the electrode plate (4)
It is also possible to attach fins (Fig. 4) to the fins.

In addition, a swinging device (not shown) is installed so that the two objects to be coated can be moved in all directions, such as front, back, left, right, up and down, and can be driven in any direction as required. It is possible to obtain a good coating. Also, the object to be painted (5)
By using a jig such as a rack basket so that all main surfaces are parallel, transportation becomes easier. Alternatively, if a special jig is not used, it may be simply fixed to a rocking device, for example. (The fixing method is not shown.) Also, a DC rectifier (6) is installed beside the electrodeposited bath (1), and the electrode plate (4) is connected to the negative electrode side of the rectifier via a cable (7a).
However, a power supply hanger (
8) is connected.

Next, one method of using the device of the present invention will be explained.

The object to be coated (5), which has been automatically or manually transferred from pre-treatment, is immersed in the electrodepositing solution (3) and transferred to the power supply hanger (8).
connected to. Subsequently, the power to the DC rectifier (6) is turned on and electricity is applied from the anode to the object to be coated (5) via the cable (7b) and the power supply hanger (8), thereby forming a coating film on the object to be coated (5).

(Actions of the Invention) The present invention, configured as described above, has the following effects.

In the apparatus according to the present invention, since the main surface of the object to be coated is parallel and the counter electrode is arranged perpendicular to the main surface of the object to be coated, a large amount of the object to be coated can be electrodeposited at once. and the amount of electrodeposition solution is smaller than that of the conventional method. the result,
The cycle of the solid content (resin content) of the electrodeposition solution is faster, the time for one turnover is shorter, a good electrodeposition solution is always used, the finish of the coating is good, and the machine is significantly improved. did.

Regarding the circulation of the electrodeposition solution, we made it possible to uniformly agitate the object to be coated while it was immersed in the electrodeposition bath, and the voltage application method also changed the distance between the electrode and the object to be coated without increasing the size of the electrodeposition bath. @# The distance of object t1H can be set to an effective size, and there is no variation in film thickness, uniformity is maintained, and the finish of the coating film is also good.

(Example) DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments and drawings.

Example 1 As shown in Fig. 1, the electrodeposition bath (1) is formed into a box shape with an open top, and an overflow tank (2) is formed on the side of the electrodeposition bath (1). . An electrodeposition liquid (3) in which a photosensitive resin composition is dispersed is stored in the electrodeposition bath, and an electrode plate (4) serving as a counter electrode to the object to be coated (5) is arranged along the inner wall. ing. The electrode plate (4) has a flat plate shape and is installed on the entire two sides and the entire bottom surface of the electrodeposition bath (1) so as to be perpendicular to the object to be coated (5).

The state of the object to be painted (5) when it enters the tank is shown in Figures 2 (a) to (C).
It looks like this. Circulation system blowout nozzle (6)
are arranged with respect to the object to be coated (5) as shown in FIG.

As a result of electrodeposition by the constant voltage method under the above conditions, the surface finish of each object to be coated was good and the film thickness was uniform.

Example 2 The difference from Example 1 is that a fin-shaped electrode structure is used, and the electrode structure is shown in FIG. Electrodeposition was carried out in the same manner as in Example 1 except for the electrode structure. As a result, stable electrodeposition was possible even at high current density, and the surface finish of the coating film was good and the film thickness was uniform. was obtained with short IF\tm.

Embodiment 3 The difference from Embodiment 1.2 is the electrode structure, in which the entire inner surface of the ``1i'' bathtub is used as an electrode, and as shown in FIG. 5, a billboard (9) is provided. Electrodeposition was carried out in the same manner as in Example 1, and the current and voltage fluctuations were small even with large liquid agitation, stable and high-speed electrodeposition was possible, and the surface finish of the coating film was good. The thickness was also uniform.

(Effects of the Invention) As described in detail below, in the present invention, as exemplified in the above embodiment, the electrodeposition coating apparatus of the present invention uses an electrodeposition liquid in which an electrodepositable resin composition is dispersed. In an electrodeposition coating apparatus that immerses a plate-shaped object to be coated in water and applies electricity to the electrodeposition liquid and the object to form a coating film on the surface of the object, a) inside the TL hot bath of the object to be coated; The array is characterized by being arranged parallel to the main surface of the object to be coated, and b) its counter electrode is arranged at a position perpendicular to the main surface of the object to be coated. Since the objects to be coated can be coated simultaneously and stably, the process can be simplified and work efficiency can be improved, and an electrodeposited coating film can be produced at low manufacturing cost and without any quality problems.

In other words, the electrodeposition coating apparatus according to the present invention is arranged parallel to the main surface of the object to be coated, and the electrode serving as the opposite electrode is arranged perpendicular to the main surface of the object to be coated. When immersed in an electrodeposition bath, the amount of electrodeposition liquid per unit area of the object to be coated is small. As a result, the turnover time is short and the amount of electrodepositing solution is small relative to the production capacity, making it very economical and very easy to manage the solution. Furthermore, since the turnover time is short, a good solid content can be used without deterioration of the fixing solution, so the performance and appearance of the formed coating film are good, and since deterioration does not progress, all the electrodeposition solution can be discarded. This situation no longer occurs. Further, the coating method of the embodiment of the present invention can be applied by a constant voltage method or a constant current method, or a constant voltage method or a constant current method.

Furthermore, although the embodiment of the present invention is an anion electrodeposition method,
It can also be applied to cationic electrodeposition.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a schematic configuration of an electrodeposition coating apparatus of the present invention, and FIGS. 2(a) to (c) are plan views showing a schematic configuration of the arrangement of objects to be coated in a tank of the present invention, respectively. A vertical cross-sectional view and a side cross-sectional view, FIG. 3 is a plan view showing the positional relationship between the blowing nozzle of the present invention and the object to be coated, and FIG. 4 is a cross-sectional view showing the schematic configuration of another electrodeposition coating apparatus according to the present invention. FIG. 5 shows tRw! of still another electrodeposition coating apparatus according to the present invention. FIGS. 6(a) to 6(c) are a plan view, a vertical cross-sectional view, and a side cross-sectional view, respectively, showing the schematic configuration of a conventional electrodeposition coating apparatus. Explanation of symbols 1...electrodeposition bath, 2...overflow tank, 3...
・Electrodeposition liquid, 4... electrode, 5... object to be coated, 6...
Blowout nozzle, 7... Power supply cable, 8... Power supply hanger, 9... Billboard. that's all

Claims (1)

[Claims] 1. A plate-shaped object to be coated is immersed in an electrodeposition liquid in which an electrodepositable resin composition is dispersed, and electricity is applied to the electrodeposition liquid and the object to be coated to form a coating film on the surface of the object to be coated. In an electro-deposition coating device that forms an electrodeposition coating device, a) the objects to be coated are arranged in the electrodeposition bath so that the main surfaces of the objects to be coated are arranged in parallel, and b) the opposite electrode is arranged in parallel with the main surface of the objects to be coated. An electrodeposition coating device characterized in that it is disposed in a vertical relationship with the electrodeposition coating device. 2. The electrodeposition coating apparatus according to claim 1, wherein the electrode serving as a counter electrode to the object to be coated has a fin shape protruding toward the object to be coated. 3. Claim 1 or 2, characterized in that the object to be coated has a swinging device that swings in one or more directions such as front and back, left and right, and up and down directions while the object to be coated is energized. Electrodeposition coating equipment. 4. A patent claim characterized in that it has one or more systems of blowing nozzles for stirring the electrodeposition liquid, such as for liquid reflux, and the diameter of the liquid blowing nozzle is arbitrary depending on the location in the bathtub. The electrodeposition coating device according to any one of the ranges 1 to 3. 5. The electrodeposition coating apparatus according to any one of claims 1 to 4, wherein the object to be coated is transported and electrodeposited using a jig such as a rack cage.