JPH0474062B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention atomizes and disperses liquid paint using a rotating atomizing head, and uses electrostatic action to spread the atomized paint onto the object to be coated. The present invention relates to a rotary atomization electrostatic coating device for coating.

(Prior Art) An electrostatic coating device is used when painting the surface of an automobile body by applying paint uniformly over the entire surface. In the case of painting using such an electrostatic coating device, that is, electrostatic painting,
A high DC voltage is applied between the object to be painted and a sprayer placed opposite to it that atomizes and disperses the paint to form an electrostatic field, and the paint atomized and dispersed from the sprayer is charged, causing an electrostatic adsorption effect. Use it to attach it to the object to be painted. By employing such electrostatic coating, it is possible to improve the adhesion efficiency of paint to the object to be painted, and therefore, it is possible to reduce loss of paint.

When such electrostatic coating is performed, if the object to be coated is metal, a bake-drying paint such as a melamine alkyd resin paint is usually used. The bake-dry paint applied to the object to be painted is cured in a heated atmosphere of, for example, about 140°C. On the other hand, when the object to be painted is made of a material with relatively low heat resistance, such as plastics, a two-component paint consisting of an acrylic resin paint base and a curing agent is used, for example. The two-component paint applied to the object to be painted generally dries and hardens at room temperature, providing good adhesion to the object and giving the painted surface gloss, hardness, and weather resistance. It will be excellent.

Two-component paints, which have the advantages mentioned above, cure in a relatively short time when the paint base and curing agent are mixed, so generally, the paint base and curing agent are prepared separately. and mixed immediately before applying the coating to the object to be coated. Therefore, when performing electrostatic painting using such a two-component paint, a mixer is usually provided to mix the paint base and the hardening agent; After mixing, the two-component paint is supplied to an atomizer, and the two-component paint is atomized and dispersed by the atomizer. Therefore, when a color change of the paint base is required, before supplying the new color paint base and curing agent to the mixer, the mixer must be used to remove the old two-component paint that has adhered to the mixer. There is a problem in that the amount of time wasted in cleaning the mixer becomes relatively large in a consistent painting process.

For this reason, for example, as described in JP-A No. 57-45370 or JP-A No. 59-228960, a bell-shaped rotary atomizing head that rotates at high speed while applying a DC high voltage is used. The main paint component and the curing agent constituting the two-component paint are supplied from a plurality of nozzles to the inner circumferential surface of the rotary atomizing head, so that the main paint component and the curing agent are mixed in the rotary atomizing head. A combination of an atomizer and a mixer for mixing a paint base ingredient and a curing agent is used. A rotary atomization electrostatic coating device has been proposed that does not require the use of rotary atomization. In such a rotary atomization electrostatic coating device, in addition to a main agent supply nozzle and a curing agent supply nozzle that supply a paint base agent and a curing agent, respectively, a cleaning agent supply nozzle that supplies a cleaning agent such as thinner is connected to its opening. A configuration is adopted in which the end is located near the inner circumferential surface of the rotary atomizing head. and,
When changing the color of the paint base, after stopping the supply of the paint base and curing agent from the base paint supply nozzle and curing agent supply nozzle, a rotating mist is created using the cleaning agent supplied from the cleaning agent supply nozzle. The inner circumferential surface of the coating head is cleaned to prepare for changing the color of the paint base, and the time loss during the painting process associated with changing the color of the paint base is significantly reduced.

(Problems to be Solved by the Invention) When a rotary atomizing electrostatic coating device as described above is used to apply paint to an object to be coated,
The paint base agent and curing agent supplied to the inner peripheral surface of the rotary atomizing head instantly reach the edge of the rotary atomizing head due to the centrifugal force generated by the high speed rotation of the rotary atomizing head, and are scattered from there. You will be forced to do so. Therefore, the paint base agent and curing agent, which are separately supplied to the inner peripheral surface of the rotary atomizing head from the opening ends of the base agent supply nozzle and the curing agent supply nozzle, are individually scattered from the edge of the rotary atomizing head. As a result, there is a possibility that the rotary atomizing head may not be able to properly mix the paint base material and the curing agent and atomize and disperse them. If the paint base material and hardening agent are not properly mixed in the atomized state, the paint base material and hardening agent may partially adhere to the paint surface of the object to be painted. Alternatively, there is an inconvenience that too much of the curing agent occurs, resulting in unevenness in the gloss, hardness, weather resistance, etc. of the painted surface.

Therefore, for example, the base paint supply nozzle and the curing agent supply nozzle are connected so that the paint base and curing agent supplied from them to the inner circumferential surface of the rotary atomizing head overlap in a direction perpendicular to the rotational axis of the rotary atomizing head. The base paint and curing agent are properly distributed from the open end of the inner circumferential surface of the atomizing head by moving toward the open end of the inner circumferential surface of the rotating atomizing head while forming a layer of It is conceivable to try to obtain a state in which the paint is mixed into atomized and diffused, but in such a case, the paint main component and curing agent form a turbulent flow on the inner circumferential surface of the rotary atomizing head. In order to prevent the proper stacking of the respective layers from being disturbed, it is desirable that the flow resistance exerted on the paint base and curing agent on the inner circumferential surface of the rotary atomizing head be small.

In view of the above, the present invention provides a method for supplying a paint base material and a curing agent, or a plurality of types of paints individually to a rotary atomizing head, and scattering them from the rotary atomizing head. The flow resistance experienced by the paint base and curing agent or multiple types of paint in the head is significantly reduced, and the paint base and curing agent or multiple types of paint can be properly mixed by the rotating atomizing head. A state in which the paint is atomized and diffused is obtained, and as a result, the paint is uniformly applied to the object to be painted, and the painted surface of the object to be painted has excellent gloss, hardness, weather resistance, etc. without any unevenness. It is an object of the present invention to provide a rotary atomization electrostatic coating device that can perform the following operations.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the rotary atomizing electrostatic coating device according to the present invention has a liquid-contacting surface in the form of an inner surface of a cup having an open end for atomizing and dispersing paint. a rotary atomizing head, a rotary drive means for driving the rotary atomizing head to rotate with a rotational axis surrounded by a liquid contact surface, and an open end facing into the rotary atomizing head. and a plurality of supply nozzles that supply paint to the liquid contact surface of the rotary atomizing head, and each of the plurality of supply nozzles dispenses the paint or a liquid forming the paint from its respective open end. The opening ends of each rotary atomizing head are arranged adjacent to each other in the vicinity of the liquid contacting surface of the rotary atomizing head in order to simultaneously spray the liquid toward substantially the same position on the liquid contacting surface of the rotary atomizing head. The liquid-contacting surface of the head is covered with a layer that reduces the flow resistance experienced by the paint or the liquid agent constituting the paint.

(Function) In the rotary atomizing electrostatic coating device according to the present invention configured as described above, a plurality of types of paints are applied to the liquid contact surface of the rotary atomizing head that is rotationally driven by the driving means. The constituent liquid agents, for example, a paint main agent and a curing agent, or each of a plurality of types of paints, are ejected toward approximately the same position on the liquid contact surface of the rotary atomization head through, for example, each of a plurality of supply nozzles, The paint base and curing agent or multiple types of paint move toward the open end of the liquid contact surface while forming respective layers that overlap in a direction perpendicular to the rotational axis of the rotary atomizing head on the liquid contact surface. It is said that Then, the paint base material and the curing agent or the plurality of types of paint that have formed respective layers on the liquid contact surface are atomized and dispersed from the open end of the liquid contact surface while forming layers. At this time, the liquid contact surface of the rotary atomizing head is covered with a layer that reduces the flow resistance experienced by the paint base and hardener or multiple types of paint, so the paint base and hardener or multiple types of paint come into contact with the liquid. The formation of turbulent flow on the liquid surface is avoided, so that the rotating atomizing head can separate the paint base and curing agent, or multiple paints with their respective layers properly stacked. When it reaches the open end of the wetted surface and is atomized and dispersed from there,
Each of the atomized particles forms a layer, which allows them to be properly mixed and atomized and dispersed from the open end of the surface in contact with the liquid. The paint will be applied evenly.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 2 schematically shows an example of a rotary atomization electrostatic coating device according to the present invention.

In the example shown in FIG. 2, the rotary atomizing head 2 is comprised of a cup-shaped portion 4 and a hub 6 provided in the center of the cup-shaped portion 4. In the example shown in FIG. The cup-shaped portion 4 has a large-diameter opening end 4a and a small-diameter opening end 4.
b, and the cup-shaped inner circumferential surface between them is the liquid contact surface 5. The inner surface of the large-diameter open end 4a of the cup-shaped portion 4 is the open end of the liquid contact surface 5. A large number of through holes 8 are formed at the connection portion between the cup-shaped portion 4 and the hub 6. Further, at the end of the cup-shaped portion 4 of the hub 6 located on the small-diameter open end 4b side, there is provided a small-diameter open end 4 of an air motor 11 for rotationally driving the rotary atomizing head 2.
A rotating shaft 12 extending into the cup-shaped portion 4 is connected via b. By this air motor 11,
The rotary atomizing head 2 is surrounded by the liquid contact surface 5 of the cup-shaped portion 4 and is rotated at high speed with a rotation axis passing through the hub 6 and the center of the rotating shaft 12.

A bracket 14 is fixed to the air motor 11, and at a predetermined position of the bracket 14, a paint supply nozzle section 16 is arranged such that its opening 17 approaches the liquid contact surface 5 through the small-diameter open end 4b of the cup-shaped section 4. At least it's installed. This paint supply nozzle section 16 includes paint supply pipes 20a and 2.
0b and a hardening agent supply pipe 20c
is connected at one end. Paint supply pipe 20
a and 20b are flow rate regulators 22 and 2, respectively.
3, and pumps 26 and 27, the other ends of which are inserted into paint tanks 32 and 33. Further, the curing agent supply pipe 20c is provided with a flow rate regulator 24 and a pump 28, and the other end is inserted into the curing agent tank 34.

Different types of paint bases or paints are stored in the paint tanks 32 and 33. For example, the paint tank 32 stores a paint base made of an acrylic resin paint containing a red pigment, and the paint tank 33 stores an acrylic resin paint containing a white pigment. A paint base consisting of resin paint is stored.
Further, in the curing agent tank 34, for example, an isocyanate-based curing agent is stored. The flow rate regulators 22 to 24 are connected to the paint supply pipes 20a and 2.
It is possible to independently adjust the amounts of the paint base material flowing through the pipe 20b and the amount of the curing agent flowing within the curing agent supply pipe 20c.

Further, a cleaning liquid supply nozzle 18 is attached to the bracket 14 with its open end 18a brought close to the liquid contact surface 5 through the small diameter open end 4b of the cup-shaped portion 4. One end of a cleaning liquid supply pipe 35 is connected to the cleaning liquid supply nozzle 18, and the cleaning liquid supply pipe 35 is provided with a flow rate regulator 36 and a pump 37, and the other end is used to store cleaning liquid such as thinner. Cleaning liquid tank 3
8.

FIG. 1 shows the above-mentioned rotary atomizing head 2 on an enlarged scale. In a specific example of the rotary atomizing head 2 shown in FIG. 1, paint supply pipes 20a and 20b form a paint supply nozzle portion 16 on the liquid contact surface 5 of the cup-shaped portion 4 constituting the head. Paint supply nozzles 16a and 16b connected to the hardening agent supply pipe 20c, and opening ends 17a and 17 of the hardening agent supply nozzle 16c connected to the hardening agent supply pipe 20c, respectively.
b and 17c (opening 1 of paint supply nozzle section 16
A surface treatment layer 44 is formed in order to reduce the flow resistance experienced by the paint base material etc. supplied from 7). Such surface treatment layer 44 is, for example, a fluororesin coating film obtained by applying a fluororesin, a plating layer containing nickel and a fluororesin, or a plating layer containing nickel and a fluororesin, or a fused plating layer containing nickel and a fluororesin. It is formed by a molybdenum thermal spray layer obtained by spraying molybdenum particles that have been made into a state. At this time, the surface of the liquid contact surface 5 of the cup-shaped portion 4 on which the surface treatment layer 44 is formed is made to have a relatively small surface roughness, for example, the surface roughness is determined by the maximum height. The maximum surface roughness Rmax shown in the figure shall take a value of 0.5μ or less.

Note that the opening ends 17a and 1 of the paint supply nozzles 16a and 16b and the curing agent supply nozzle 16c, respectively,
7b and 17c are arranged adjacent to each other in a direction perpendicular to the rotation axis of the rotary atomizing head 2 in the vicinity of the liquid contact surface 5 on which the surface treatment layer 44 is provided. Furthermore, although not shown, between the rotary atomizing head 2 consisting of the cup-shaped portion 4 and the hub 6 and the object to be coated, for example, a DC high voltage is applied with the rotary atomizing head 2 side being the negative pole side. It is made to be done.

When the object to be coated is coated with the above-described configuration, first, the air motor 11 is activated, and the rotary atomizing head 2 is moved to the above-mentioned cup-shaped portion 4 in contact with the liquid. It is surrounded by the surface 5, has a rotation axis passing through the center of the hub 6 and the rotation shaft 12, and rotates at a rotation speed of, for example, 20,000 to 30,000 rpm. At this time, the rotary atomizing head 2 has, for example, -
A high DC voltage is applied so that the potential is 90 kV.

In such a state, for example, the pumps 27 and 28 are activated, and the acrylic resin paint base containing the white pigment stored in the paint tank 33 and
The isocyanate curing agent stored in the curing agent tank 34 is guided to the paint supply nozzle 16b and curing agent supply nozzle 16c in the paint supply nozzle section 16 through the paint supply pipe 20b and the curing agent supply pipe 20c. At that time, the flow rate regulator 23
and 24 are metered.

The paint main agent and curing agent respectively guided to the paint supply nozzle 16b and curing agent supply nozzle 16c in the paint supply nozzle section 16 are simultaneously supplied from the opening end 17b of the paint supply nozzle 16b and the opening end 17c of the curing agent supply nozzle 16c. The liquid is ejected and supplied to the liquid contact surface 5 of the cup-shaped portion 4 of the rotary atomizing head 2 rotating at high speed. At this time, the opening end 17b of the paint supply nozzle 16b and the opening end 17c of the curing agent supply nozzle 16c are connected to the rotary atomizing head 2 in the vicinity of the liquid contact surface 5 of the cup-shaped part 4, as shown in FIG. Since they are arranged adjacent to each other in a direction perpendicular to the axis of rotation, the paint main agent jetted from the opening end 17b of the paint supply nozzle 16b and the curing agent jetted from the opening end 17c of the hardening agent supply nozzle 16c are rotated. The liquid is caused to collide with substantially the same position on the surface treatment layer 44 provided on the moving liquid contact surface 5.

In this way, the paint base material and the curing agent collided at substantially the same position on the surface treatment layer 44, and then moved along the surface treatment layer 44 to form a bond between the cup-shaped portion 4 and the hub 6. A flow is formed in the direction from the small-diameter opening end 4b of the cup-shaped part 4 toward the large-diameter opening end 4a (radial direction of the cup-shaped part 4) through the large number of through holes 8 formed in the connecting part. This tendency becomes more pronounced as the rotational speed of the cup-shaped portion 4 increases. Then, such surface treatment layer 44
The surface treatment layer 4 is collided with the surface treatment layer 4 at approximately the same position
The paint main agent and curing agent flowing along the atomizing head 4 are affected by the centrifugal force caused by the high speed rotation of the rotary atomizing head 2, and as shown in FIG. Among them, the paint base material having a high specific gravity forms a layer Fa in contact with the surface treatment layer 44, and the curing agent having a low specific gravity forms a layer Fi in contact with the paint base layer Fa. That is, the paint base agent and curing agent are
On the surface treatment layer 44 provided on the liquid contact surface 5, layers are formed to be stacked in a direction perpendicular to the rotational axis of the rotary atomizing head 2, and the layers are moved toward the open end of the liquid contact surface 5. It will become something that will last. At this time, since the surface treatment layer 44 is designed to reduce the flow resistance experienced by the paint base material and hardening agent, a situation where the paint base material and hardening agent form turbulent flow on the liquid contact surface 5 does not occur. .

Then, the paint main agent and curing agent that reach the large-diameter opening end 4a of the cup-shaped portion 4, that is, the open end of the liquid contact surface 5, forming layers Fa and Fi, are transferred to the rotary atomizing head 2 at high speed. Due to the centrifugal force associated with rotation, the wetted surface 5
From the open end of , fine particles R are formed and atomized and dispersed. At that time, the paint main agent and curing agent are used in layer Fe and layer
Since the fine particles R are atomized and dispersed while still forming Fi, each of the fine particles R contains the respective layers of the paint base agent and the curing agent, and the large-diameter opening end of the cup-shaped portion 4 in the rotary atomization head 2 From the part 4a, the atomized paint in which the main paint agent and the curing agent are properly mixed is emitted.

Therefore, a paint obtained by mixing an acrylic resin paint base containing a white pigment and an isocyanate hardener at a weight ratio of 3:1 is uniformly adhered to the surface of the object to be painted. Paint is applied.

After the object to be painted is coated with an acrylic resin paint base containing a white pigment, the other objects to be painted are painted using an acrylic resin paint base containing a red pigment. Therefore, when changing the color of the paint base,
The operation of the pumps 27 and 28 is stopped, and the supply of the paint main agent and curing agent from the paint tank 33 and the curing agent tank 34 is stopped, and the pump 37 provided in the cleaning liquid supply pipe 35 is activated. As a result, the cleaning liquid such as thinner stored in the cleaning liquid tank 38 is supplied to the cleaning liquid supply nozzle 1 through the cleaning liquid supply pipe 35 and the flow rate regulator 36.
Guided by 8. Then, the cleaning liquid guided to the cleaning liquid supply nozzle 18 is supplied from the opening end 18a of the cleaning liquid supply nozzle 18 to the liquid contact surface 5 of the cup-shaped part 4 of the rotating rotary atomizing head 2, and the inside of the rotary atomizing head 2 is supplied. cleaning is performed.

Thereafter, the operation of the pump 37 is stopped, and the pumps 26 and 28 are started, and the acrylic resin paint base and isocyanate hardener containing the red pigment stored in the paint tank 32 and hardener tank 34 are supplied to the paint. The flow rate regulators 22 and 2 are
4 is performed, and the paint supply nozzle section 16
The paint supply nozzle 16a and the curing agent supply nozzle 16c are further connected to the paint supply nozzle 1.
6a and the curing agent supply nozzle 16c are simultaneously ejected from the open end 17a of the paint supply nozzle 16a and the open end 17c of the curing agent supply nozzle 16c, and the rotary atomizing head rotates at high speed. Liquid contact surface 5 of cup-shaped part 4 in 2
supplied for. Also at this time, the opening end 17a of the paint supply nozzle 16a and the opening end 17c of the curing agent supply nozzle 16c are connected to the rotary atomizing head in the vicinity of the liquid contact surface 5 of the cup-shaped part 4, as shown in FIG. 2 are stacked and adjacent to each other in the direction perpendicular to the rotational axis of the two, so that the paint main agent ejected from the open end 17a of the paint supply nozzle 16a,
The curing agent jetted from the open end 17c of the curing agent supply nozzle 16c collides with substantially the same position on the surface treatment layer 44 provided on the rotating liquid contact surface 5.

Therefore, in this case as well, as in the case described above, the paint main ingredient and curing agent are applied on the surface treatment layer 44 provided on the liquid contact surface 5 in a direction perpendicular to the rotational axis of the rotary atomizing head 2. The layers are stacked one on top of the other and move towards the open end of the liquid contact surface 5, and are atomized and dispersed from the open end of the liquid contact surface 5. Furthermore, since the surface treatment layer 44 is intended to reduce the flow resistance experienced by the paint base material and hardening agent, a situation in which the paint base material and hardening agent form a turbulent flow on the liquid contact surface 5 does not occur. The large-diameter open end 4 of the cup-shaped portion 4 in the rotary atomizing head 2
From a, the atomized paint is dispersed with the paint base and curing agent properly mixed, and the acrylic resin paint base containing the red pigment and the isocyanate base are sprayed onto the surface of the object to be painted. A coating is applied by uniformly adhering a coating material obtained by mixing a curing agent and a curing agent at a predetermined weight ratio.

In addition, in the example shown in FIG.
6, 27, and 28 were operated simultaneously, and the acrylic resin paint base containing red pigment stored in paint tanks 32 and 33 and the acrylic resin paint base containing white pigment stored in hardener tank 34. The isocyanate curing agent is supplied to the paint supply pipes 20a and 20b and the curing agent supply pipe 2.
The paint is guided to the paint supply nozzles 16a and 16b and the curing agent supply nozzle 16c in the paint supply nozzle section 16 through the paint supply nozzle 0c, and further guided to the paint supply nozzles 16a and 16b and the curing agent supply nozzle 16c, respectively. The main agent and curing agent are
Open ends 17a of paint supply nozzles 16a and 16b
and 17b and the opening end 17c of the curing agent supply nozzle 16c, and may be simultaneously jetted out and supplied to the liquid contact surface 5 of the cup-shaped portion 4 in the rotary atomization head 2 rotating at high speed. . In such a case, the paint supply nozzles 16a and 16b
and the opening end 17c of the curing agent supply nozzle 16c.
The curing agent ejected from the liquid contact surface 5 collides with substantially the same position on the surface treatment layer 44 provided on the rotating liquid contact surface 5.

In such a case, the paint supply nozzle 16
The mixture of the two types of paint main ingredients and the curing agent that are sprayed from the open ends 17a and 17b of the a and 16b, respectively, are sprayed onto the surface treatment layer 44 provided on the liquid contact surface 5 by the rotation of the rotary atomizing head 2. The layers are stacked in a direction perpendicular to the axis and move toward the open end of the liquid contact surface 5, and are atomized and dispersed from the open end of the liquid contact surface 5. Thereby, on the surface of the object to be painted, an acrylic resin paint base containing a red pigment, an acrylic resin paint base containing a white pigment, and an isocyanate curing agent are mixed in a predetermined weight ratio. Paint is applied by making the paint adhere homogeneously.

Further, unlike the above-described example, the paint tanks 32 and 33 in the example shown in FIG. 2 are configured to store red paint and white paint, such as melamine alkyd paint, respectively. Mixed coating of these two types of paints may be performed.

In such a case, the pumps 26 and 27 are operated, and the red paint and white paint stored in the paint tanks 32 and 33 are metered by the flow rate regulators 22 and 23 through the paint supply pipes 20a and 20b. and are guided to the paint supply nozzles 16a and 16b, respectively, in the paint supply nozzle section 16,
Furthermore, the paint introduced to the paint supply nozzles 16a and 16b is supplied to the paint supply nozzles 16a and 16b, respectively.
The liquid is simultaneously ejected from the open ends 17a and 17b of the atomizer 6b, and is supplied to the liquid contact surface 5 of the cup-shaped portion 4 in the rotary atomizing head 2 rotating at high speed. In such a case, the paint ejected from the open ends 17a and 17b of the paint supply nozzles 16a and 16b, respectively, is applied to the surface treatment layer 4 provided on the rotating liquid contact surface 5.
The collision will occur at approximately the same position on 4.

In this case, the paint supply nozzle 16a
The two types of paint sprayed from the open ends 17a and 17b of the paints 16b and 16b are sprayed onto the surface treatment layer 44 provided on the liquid-contacted surface 5, depending on their specific gravity, at right angles to the axis of rotation of the rotary atomizing head 2. The atomized particles are formed into layers stacked in the same direction as each other, and move toward the open end of the liquid contact surface 5, and are atomized and dispersed from the open end of the liquid contact surface 5. As a result, the surface of the object to be painted is coated with a mixed paint obtained by mixing red paint and white paint in a predetermined weight ratio, which is uniformly adhered to the surface.

In the above example, the paint supply nozzle section 16 includes a curing agent supply nozzle in addition to the paint supply nozzle, but instead of the paint supply nozzle section 16, a plurality of paint supply nozzles may be used. It is also possible to use a paint supply nozzle section formed by a chisel.

(Effects of the Invention) As is clear from the above explanation, according to the rotary atomizing electrostatic coating device according to the present invention, a paint base material and a curing agent, or a plurality of them, can be applied to a rotary atomizing head for electrostatic coating. When various types of paints are individually supplied and scattered from the rotary atomizing head, the paint main agent and curing agent, or multiple types of paints supplied to the liquid contact surface of the rotary atomizing head, are It is assumed that the particles move toward the open end of the liquid contact surface while forming layers that overlap in a direction perpendicular to the rotational axis of the head, and are atomized and dispersed from the open end of the liquid contact surface.
At that time, since a layer is provided on the surface in contact with the liquid to reduce the flow resistance experienced by the main paint agent, curing agent, or multiple types of paint, the main paint agent, curing agent, or multiple types of paint flow turbulently on the surface in contact with the liquid. This prevents the layers from interfering with the proper stacking of the layers. Therefore, the paint main ingredient and the curing agent, or
A state in which multiple types of paint are properly mixed and atomized and dispersed can be obtained, and the paint can be uniformly applied to the object to be painted, making the painted surface of the object glossy and shiny. It can be made to have excellent hardness, weather resistance, etc. without any unevenness.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing essential parts of an example of a rotary atomizing electrostatic coating apparatus according to the present invention, and FIG. 2 is a schematic configuration diagram showing an example of a rotary atomizing electrostatic coating apparatus according to the present invention. In the figure, 2 is a rotating atomizing head, 4 is a cup-shaped part,
5 is a liquid contact surface, 11 is an air motor, 16 is a paint supply nozzle section, 17 is an opening, 20a and 20b are paint supply pipes, 20c is a curing agent supply pipe,
32 and 33 are paint tanks, 34 is a curing agent tank, and 44 is a surface treatment layer.

Claims (1)

[Scope of Claims] 1. A rotary atomizing head having a wetted surface in the form of an inner surface of a cup having an open end for atomizing and dispersing paint, and a rotating axis surrounding the rotary atomizing head by the wetted surface. and a rotary drive means for driving the rotary atomizing head to rotate, and an open end facing into the rotary atomizing head, and supplying paint to the liquid contact surface of the rotary atomizing head. a plurality of supply nozzles, each of which supplies the paint or a liquid forming the paint from its respective open end;
The opening end is arranged adjacent to the liquid contact surface of the rotary atomization head so as to simultaneously spray the liquid to substantially the same position on the liquid contact surface of the rotary atomization head. 1. A rotary atomizing electrostatic coating device, characterized in that a surface in contact with a liquid in a coating head is covered with a layer that reduces flow resistance experienced by the paint or a liquid agent constituting the paint.