JPH04247254A - Coating device for reaction-curing paint - Google Patents

Abstract

PURPOSE:To easily clean the tip of a coating device after >=2 reaction-curing paints are mixed in the vicinity of the tip. CONSTITUTION:A paint feeding pipe 5 for supplying >=2 reaction-curing paints to a coating nozzle 13 is jacketed with an outer pipe 7 at its paint mixing part 6, water 16 is sealed into the gap between the outer pipe 7 and the periphery of the paint feeding pipe 5, the vibration from an ultrasonic vibrator 8 is transmitted to the pipe 5 through the water 16, and the paints are mixed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reaction-curing paint coating apparatus for mixing two or more reaction-curing paints.

0002

BACKGROUND OF THE INVENTION For example, two-component urethane paints begin a reaction and harden as soon as they are mixed, so it is necessary to mix them as close to the tip of the paint sprayer as possible. Various types of such coating apparatuses have been known in the past (for example, JP-A-63-16067), and those of a mixing type using a static mixer are frequently used.

0003

[Problems to be Solved by the Invention] However, when paint is mixed using the above-mentioned static mixer, cleaning is difficult due to the complicated internal structure of the mixer. There was a problem that it took a long time.

The present invention was developed in view of the above circumstances, and is a reactively curing paint that can be easily mixed near the tip of a coating machine and that does not require a long time to clean after use. The purpose of the present invention is to provide a paint coating device.

[0005]

[Means for Solving the Problems] The reaction-curing paint coating device of the present invention is connected to a coating section that sprays paint, and mixes two or more supplied reaction-curing coating materials and sends the mixture to the coating section. A paint supply pipe that is inserted into the paint mixing part of the paint supply pipe, and an outer pipe that is inserted into the paint mixing part of the paint supply pipe and has a liquid sealed between it and the outer peripheral surface of the paint supply pipe, and an ultrasonic vibration is applied to the liquid in the outer pipe. This device is characterized by comprising an ultrasonic generation section that generates ultrasonic waves, and a cooling section that cools the liquid inside the outer tube.

[0006]

[Operation] According to the above structure, the ultrasonic vibration from the ultrasonic generator is first applied to the liquid in the outer tube, and the vibration of this liquid is transmitted to the paint via the paint supply pipe, and then transmitted to the paint. The vibrations mix the paint. In this way, the paint mixing part has a double structure consisting of the paint supply pipe that supplies the paint and the outer tube that contains the liquid to which ultrasonic vibrations are applied, and the ultrasonic vibrations are indirectly transmitted to the paint via the liquid. With this structure, the paint does not adhere to parts other than the paint supply pipe, and cleaning the paint after use becomes extremely easy, and the structure can be simplified.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing a coating apparatus for a reactively curable paint according to an embodiment of the present invention. That is, this device is a coating device that mixes and sprays two-component urethane paint, and consists of a first container 1 containing a base agent, a second container 2 containing a curing agent, and these two containers. a pump 3 that pumps up the main agent and curing agent contained in 1 and 2;
It is equipped with 4.

[0009] Also, a paint supply pipe 5 mixes the main resin and curing agent from these pumps 3 and 4 and sends the mixture to the tip of the device.
an outer tube 7 which is inserted into the paint supply pipe 5 in the paint mixing section 6 and has water sealed between it and the paint supply pipe 5; It includes a pair of ultrasonic vibrators 8 that apply vibrations to the liquid in the outer tube 7, and an ultrasonic oscillator 9 that causes the ultrasonic vibrators 8 to generate vibrations.

Furthermore, a cooler 10 and a pump 11 are provided to circulate and cool the water heated by the vibrations.

Further, the tip portion 12 is provided with a rotary atomizing electrostatic coating nozzle 13 for spraying the mixed paint sent from the paint supply pipe 5, and furthermore, this coating nozzle 1
a plurality of ultrasonic vibrators 14 that apply ultrasonic vibration to the particulate paint sprayed from 3 to further refine the paint;
The ultrasonic transducer 14 is equipped with an ultrasonic oscillator 15 that generates vibrations.

As mentioned above, in this apparatus, the paint mixing section 6
The paint supply pipe 5 and the outer pipe 7 are constructed to form a double structure. FIG. 2 shows a partially cutaway view of these tubes 5, 7, and as shown, these tubes 5, 7 are formed to have substantially concentric circles in cross section. The paint supply pipe 5 is made of Teflon and has flexibility.

FIG. 3 is an enlarged partial sectional view showing a portion where the ultrasonic transducer 8 is provided. That is, high frequency waves from the ultrasonic oscillator 9 are applied to the vibrator 8 , and the vibrations generated thereby are transmitted to the water 16 sealed in the outer tube 7 .

Note that the circulation speed of the water 16 is set to be slower than the vibration transmission speed within the water 16.

The liquid sealed in the outer tube 7 is as follows:
In order to reduce transmission loss, it is desirable to use a material with low viscosity, and water may be used as in this embodiment, but it is more desirable to use methyl alcohol or acetone.

Furthermore, in FIG. 1, two ultrasonic vibrators 14 are provided near the spray nozzle of the coating nozzle 13, but in reality, three ultrasonic transducers 14 are provided on the circumference around the rotation axis of the coating nozzle 13. In the above, for example, eight are provided.

Next, the apparatus of the above embodiment was set under the following conditions, and the color difference when the two-component urethane paint was mixed was measured, and the results are shown in Table 1. As a comparative example, Table 1 also shows the color difference when mixing using a static mixer and the color difference when the two-component paint was simply sent to the paint supply pipe 5 and no mixing operation was performed. Note that this color difference is based on a ratio of main agent: hardening agent of 4:1.
It is the color difference (ΔE) from the standard color obtained by mixing with a homomixer at a ratio of . The smaller this value is, the better the mixing property is. Note that the base agent is colored white and the curing agent is colored red.

Conditions ◆ Electrical input: 15 W/cm2 ◆ Resonance frequency: 400 to 500 kc/sec ◆ Vibrator: Barium titanate oscillator ◆ Medium circulation speed: 10 cm/sec ◆ Vibration medium: Water (underwater propagation velocity (water temperature 25°C) ) is 1497
m/sec, viscosity is 1cp) ◆ Base agent supply rate: 1600cc/min ◆ Hardening agent supply rate:
40cc/min ◆ As is clear from Table 1, when the paint is mixed using the apparatus of this embodiment, the mixing performance is improved compared to when the paint is mixed using a static mixer.

The coating apparatus for the reaction-curing paint of the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways.

For example, in the above embodiment, two liquids are mixed, but a configuration in which three or more liquids are mixed is also possible.

Furthermore, although it is not necessary to provide two ultrasonic transducers 8, at least two ultrasonic transducers 8 are required, since if these two are placed at appropriate positions, the vibration intensity will increase due to the interference effect.
It is desirable to provide one.

[0022]

Effects of the Invention As explained above, according to the coating apparatus for reactively curing paint of the present invention, vibrations are transmitted to the paint passing through the paint supply pipe through the vibration transmission medium disposed outside the paint supply pipe. This allows the paint passing through the paint supply pipe to be mixed, so that the paint mixing parts other than the paint supply pipe do not come into contact with the paint, making it extremely easy to clean the equipment after use. , and its configuration can be simplified.

[0023]

[Table 1]

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a coating device for a reactively curable paint according to an embodiment of the present invention.

[Fig. 2] A partial sectional view showing an enlarged part of the paint supply pipe and outer pipe shown in Fig. 1.

[Fig. 3] Partial cross-sectional view showing an enlarged view of the ultrasonic transducer shown in Fig. 1

[Explanation of symbols]

1 First container 2 Second container 5 Paint supply pipe 6 Paint mixing section 7 Outer tube 8, 14 Ultrasonic transducer 9, 15 Ultrasonic oscillator 13 Electrostatic painting nozzle 16 Water

Claims (1)

[Claims] Claim 1: A paint supply pipe that is connected to a coating section that sprays paint, mixes two or more supplied reaction-curing paints, and sends the mixture to the coating section; An outer tube that is inserted into the tube and has a liquid sealed between it and the outer peripheral surface of the paint supply tube, an ultrasonic generator that applies ultrasonic vibration to the liquid in the outer tube, and a cooling device that cools the liquid in the outer tube. 1. A coating device for a reactive hardening paint, comprising: a.