JPS59213468A - Painting method of reaction curing type - Google Patents

Abstract

PURPOSE:To mix a base material and a hardener always at a highly accurate mixing ratio by detecting the respective amt. of the base material and hardener supplied, comparing the supply ratios with a set mixing ratio and controlling the mixing ratio. CONSTITUTION:The respective amts. of the base material and hardener supplied from base material supplying lines 12-17, 47 and hardener supplying lines 31, 32, 48 are detected with detectors 56-60. The detected amts. and a preset mixing ratio are compared and the amts. of the base material and hardener to be supplied are controlled to attain the preset mixing ratio. Then the always highly accurate mixing ratio is assured even if the amts. of said materials to be supplied fluctuate and the environmental conditions change.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for applying a reaction-curing paint for performing painting work using a two-component reaction-curing paint or a three-component reaction-curing paint. .

Generally, 1 is used for reaction-curing paints such as polyurethane resin paints, unsaturated polyester resin paints, polyurethane resin paints, and IP xy resin paints.
It has been attracting attention because it contains a small amount of solvent and is capable of curing by a 'textile reaction', which does not require thermal energy during curing and drying of the coating film.

However, due to problems with the pot life (pot life) of this reaction-curing paint, it is impossible to manufacture or distribute it in a blended or mixed state. However, there is a problem in that these three components must be handled as separate containers and supply systems, and must be mixed and then sprayed before application. In addition, depending on the type of base resin, the type of pigment contained in the base resin, etc., the mixture extrusion of the base resin and curing agent, or the mixture extrusion of the base resin, curing agent, and additives can be controlled with high precision. There is a problem that it is indispensable.

For this reason, in the conventional method, a mixture is created by mixing the main agent and curing agent supplied from the main agent supply system and the curing agent supply system, respectively, and this mixture is directed from the coating machine to the object to be coated. When spraying, a two-liquid fixed-ratio bomb consisting of a pair of pumps or a pair of drilling cylinder units is inserted between the main agent supply system and the curing agent supply system, and the discharge volume ratio of these pumps or each! A device is known in which mixed pressure is managed by changing the stroke ratio between cylinder devices.

However, in the conventional method described above, each time the mixing ratio is changed, the two-liquid constant ratio is changed. However, it is necessary to mechanically change the rotation ratio of the engine or the stroke ratio of the total cylinder device, which has the disadvantage that the operation is very troublesome. In addition, since the conventional method described above is sequential control,
Even if the mixing ratio is adjusted accurately, there is a drawback in that it is not possible to constantly monitor fluctuations in the supply amount due to ambient conditions such as temperature and viscosity. Furthermore, it is not possible to configure a system that continuously sprays many types of paint while changing the type of base agent or color, and additives must be mixed separately. The present invention was developed in view of the above-mentioned drawbacks, and it enables mixing of the base material and curing agent, or the base material and curing agent, before painting. It is an object of the present invention to provide a method for coating a reaction-curing paint, which detects the additive supply λ and maintains highly accurate mixing based on the detected amount.

In order to achieve the above object, the feature of the configuration adopted by the first invention of this application is to detect the supply amounts respectively supplied from the main agent supply system and the curing agent supply system, and to The present invention is characterized in that the supply amount and the preset mixing ratio are compared, and the supply amounts of the base resin and curing agent are controlled so as to achieve the preset mixing ratio.

Key 1 of the configuration adopted by the second invention related to this application
．． The controller detects the supply amounts supplied from the main agent supply system, curing agent supply system, and additive supply system, and compares the detected amounts with a preset mixing extrusion, and calculates the amount of the main agent, curing agent, and The present invention is characterized in that the supply amount of the additive is controlled so as to achieve a preset mixing pressure.

The present invention will be described below based on embodiments not shown in the drawings.

FIG. 1 shows a first embodiment of the present invention, in which numeral 1 indicates a color change valve device, and the color change valve device r! t1 includes a manifold 2 having two main agent passages therein, an air valve 3 whose outflow side is connected to the main agent passage 2A, a thinner valve 4, and a plurality of main agent valves 5.
, 6.7, and the air valve 3 and thinner valve 4 are, for example, an air-driven spring return type 2.
A port 2 position switching valve is used, and main agent valves 5, 6.7
For example, an air-driven spring return type three-port two-position switching valve is used. The air valve 3 and the thinner valve 4 are arranged on the most upstream side of the two main agent passages of the manifold 2, the air valve 3 is connected to the air source 9 via the air piping 8, and the thinner valve 4 is connected to the thinner valve 4 through the air pipe 8. The air valve 3 and the thinner valve 4 are normally in a closed position unless control air is supplied. On the other hand, the main agent valves 5, 6.
7 is color A and color B via main agent piping 12, 13, and 14.

It is connected to the main agent tank 15, 16.17 of color 0, and also connected to each of the main agent piping 12, 13.14 via the return pipe 18, 19.20, and the main agent piping 12, 1
In the middle of 3.14, between the connection girder of each return pipe 18, 19, 20 and the main agent valve 5.6.7, the main agent pumps 21, 22, 23, which are positive displacement pumps such as gear pumps, are installed. are provided, and each of the pumps 21, 22, 23 is configured to be driven by a main agent motor 24.

When control air is not supplied to the main agent valves 5, 6.7, the main agent ΣJ! 'Pump 21, 22゜2
3, the main agent pumps 21, 22, 23,
It circulates between the main agent pipes 12, 13, 14, the main agent valves 5, 6°7, and the return pipes 18, 19, 20.

25 is a curing agent switching valve device, and the curing agent switching valve device 25
is a manifold 26 with a curing agent passage 26A inside.
The thinner valve 27 and the hardening agent valve 28, whose outflow side is connected to the hardening agent passage 26A, are approximately H1, and the thinner valve 27 is an air-driven spring return type 2d? similar to the one described in H1. -) A 2-position switching valve is used, and the curing agent valve 28 is also an air-driven knob ring return type 3-port 2-position switching valve. The thinner valve 27 is arranged upstream of the hardening agent passage 26A of the manifold 26, and the thinner valve 27 is connected to a circulation pipe 30 as a thinner source via a thinner pipe 29. On the other hand, the curing agent valve 28 is connected to the curing agent source 3 via the curing agent piping 31.
2 and the hardening agent pipe 31 via a return pipe 33, and a gear pump, for example, is connected to the hardening agent pipe 31 between the connection position of the return pipe 33 and the hardening agent valve 28. d? for curing agent consisting of a positive displacement pump such as A pump 4 is provided, and the pump 34 is configured to be driven by a curing agent motor 35. The thinner valve 27 is normally in the closed position unless control air is supplied, while the hardener valve 28 is operated by the hardener pump 34 when the control air is not supplied. 34, the hardening agent pipe 31, the hardening agent valve 28, and the return pipe 33.

36 is an additive switching valve device, and the additive switching valve device @36 includes a manifold 37 having an additive passage 37A therein;
Thinner valve 38 whose outflow side is connected to the additive passage 37A
, an additive valve 39, and the thinner valve 38 is an air-driven spring return type 2-boat 2-position switching valve similar to that described above, and the additive valve 39 is also an air-driven spring return type 3 valve. A port 2-position switching valve is used. The thinner valve 38 is arranged upstream of the additive passage 37A of the manifold 37, and the thinner valve 38 is connected to a circulation pipe 41 as a thinner source via a thinner pipe 40. On the other hand, additive valve 3
9 is connected via an additive pipe 42 to an additive source 43 storing additives such as a solvent, a surface tension reducing agent, a curing retarder, etc., and is connected to the additive pipe 4 via a return pipe 44.
2, and in the middle of this additive pipe 42, between the connecting position of the return pipe 44 and the additive valve 39, there is an additive cylinder 7, which is a customer-ready type 2 pump such as a gear pump, as described above.
'45 is provided, and the pump 45 is connected to an additive motor 46.
It is configured such that it can be moved by i. The thinner valve 38 is normally in the closed position as long as control air is supplied, while the hardener valve 39 is in the closed position as long as the control air is not supplied. Pump 45, additive piping 42, additive valve 3
9 and the return pipe 44.

Reference numerals 47, 48, and 49 indicate main agent piping, curing agent piping, and additive piping, respectively. One end of each pipe 47.48° 49 is connected to the outlet of each manifold 2, 26.37, and the other end is connected to a static mixer, for example. Line mixer 5 like
0 and in the middle of each manifold 2.26.37 to line mixer 5
Check valves 51, 52.5 that allow liquid to flow only towards zero
3 are provided respectively. 54 is a paint pipe whose one end is connected to the outflow side of the line mixer 50, and the other end of the paint pipe 54 is provided with a coating machine 55 consisting of, for example, an air gun, an airless gun, etc., and the coating machine 55 can be used as needed. A high voltage is applied to constitute an electrostatic coating machine.

On the other hand, 56.57, 58, 59.60 are each par? pump 21
, 22, 23, 34, and 45, and each of the rotation detectors 56 to 60 is connected to each sD pump 21 to 23.
．． 34 and 35) is output. In addition, each of the above yJ? 21-23, 34
．． By using a positive displacement pump as 35, it is possible to measure the actual flow m by subtracting a predetermined flow coefficient to these rotational speeds, so the supply amount signal can be expressed digitally or analogously. The amount of supply can be determined by

Furthermore, reference numeral 61 is a fliljergy device comprising, for example, a node circuit, a microcomputer, etc., and 62 is a device that automatically sets the mixing ratio of the base resin, curing agent, and additives to a desired ratio according to the scale of each base resin. The control device 61 uses a predetermined mixture ratio that is preset and inputted by a mixing ratio setting device 62 and a rotation detection i:':56 that is inputted via signal lines 63 to 67. - 60, and based on this comparison result, the motors 24, 3
It has a function of controlling the rotation speed of 5.46 to a mixing ratio preset by a mixing ratio setting device 62. Therefore, the control device 61 outputs a rotation control signal to the motors 24, 35, 46 through the signal lines 68, 69, 70, and causes each motor 24, 35.4G to rotate at a predetermined number of rotations. , this causes υ pumps 21 to 23, 34.4
5 is rotated to achieve a predetermined mixing ratio.

The coating apparatus used in this embodiment is constructed as described above. Next, a coating method using this coating apparatus will be described.

It is now assumed that all the elements constituting the above-mentioned apparatus have been thoroughly cleaned. In this state, it is assumed that a painting operation is performed using the base material of color A stored in the base material source 15.

Assuming that the mixing ratio of the main material, curing agent, and additive for this color A main material is 10:2:1, this is set by the mixing ratio setting device 62 in the starting operation of the painting operation. The value is automatically input into the control device 61 and stored in its storage area. Alternatively, this setting operation may be a manual setting.

Next, control air is supplied to the main agent valve 5, curing agent valve 28, and additive valve 39 to switch the valves, and a rotation control signal is sent from the control device 61 to the motor 24° 35.46 via signal lines 68 to 70. , the motors 24, 35, 46 rotate according to the aforementioned mixing ratio, and the pumps 21-23, 34.
45 is rotated. As a result, A in the main agent source 15
The color main agent is supplied to the line mixer 50 via the main agent piping 12, pump 21, main agent valve 5, manifold 2, main agent piping 47, and check valve 51, and the hardening agent in the hardening agent source 32 is supplied to the hardening agent piping 31, Pump 34, curing agent valve 28, curing agent piping 4
8. Supplied to the line mixer 50 via the check valve 52,
Furthermore, the additive in the additive source 43 is also supplied to the line mixer 50 via the additive pipe 42 , the pump 45 , the additive valve 39 , the additive pipe 49 , and the check valve 53 . The mixture obtained by mixing the base agent, curing agent, and additives by the line mixer 50 is supplied to the coating tank 55 via the coating pipe 54, and is sprayed from the coating machine 55 onto the object to be coated. be done. During this time, the pumps 22 and 23 are also rotated, but since the main agent valves 6 and 7 are not switched, the main agents for colors B and 0 are pumped through the respective pumps 7' 22, 23, the main agent pipes 13, 14, Main agent valves 6, 7, return piping 12',
It only cycles between 13.

On the other hand, the rotation speed of the pump 21.34.45 is detected by the rotation detector 5.
6159160, respectively, and supply amount signals from these are signal lines 63 and 66.

Inputs are inputted to the control device 61 via 67 every moment.

As a result, the control device 61 adjusts the predetermined mixing ratio that has been set and stored in advance, and the
The signal lines 68 and 69 are constantly compared with the supply number Iha inputted from 0 and based on the comparison result.

Motor 24 . , 35, and 46 to control the rotation speed by outputting a rotation control signal for maintaining a predetermined mixing ratio. With this, 7j? 21.34°45
is rotated to achieve a predetermined mixing ratio.

Incidentally, the feed signal is also output from the rotation detector 57.58 of the pump 22.23, but the mixing ratio setting device 62
Since only the mixing ratio for the base material of color A is set from , there is no comparison of these supply amount signals.
Stop the supply of control air to the main agent valve 5, curing agent valve 28, and additive valve 39, return these to their original switching positions, and set the A color main agent from the mixing ratio setting device 62. Reset value input.

However, is reaction curing paint the moon? It hardens after its dry life, so it needs to be cleaned as soon as possible. For this reason, after the completion of the painting work, control air is automatically supplied to the air valve 3 to open it, and air from the air source 9 is supplied to the manifold 2 via the air piping 8, and the main agent passage 2A, the main agent The inside of the pipe 47 is discharged. Once this is completed, supply control air to each of the thinner valves 4°27.38 to open them, and open the thinner valves 10.304.
Thinner from 1 is supplied to manifolds 2 and 26.37 via thinner pipes g and 29.40, respectively. As a result, the thinner from each manifold 2.26°37 is transferred to the main agent pipe 47. Hardening agent piping 48, additive 49, check valve 51
53, a line mixer 50, and a paint/4' tube 54, the paint is supplied to a coating machine 55, and the interior thereof is cleaned. In particular, each pipe 47 on the downstream side of the check valves 51 to 53
~48, line mixer 50. Since the paint sprayer 54 and the paint sprayer 55 are filled with a mixture of the main agent and hardener,
Thoroughly clean these insides. Furthermore, if even a small amount of the main agent of color A remains in the manifold 2 for the main agent and the main agent piping 47, there is a risk of color mixing during the next painting operation, so after cleaning with thinner is completed, the air valve 3 is again controlled. Air is supplied and the valve is opened, and cleaning air from the air source 9 is supplied to the manifold 2 through the air piping 8 to remove the A color base material and thinner remaining in the manifold 2 and the base material pipe 47. is purged and dried, and then the check valve 51 is
, line mixer 50, paint 7'P Eve 54, paint machine 55
Purge the mixture and thinner remaining inside and dry. The cleaning operation is completed in this way, but the cleaning operation may be carried out by repeating the above-mentioned steps several times as necessary.

The painting work and cleaning work using the PH color main material have been completed above, but if you want to perform the painting work using the B color main material or the 6 color main materials, you can do the same as above. It is something.

Next, FIG. 2 shows a second embodiment of the present invention, in which the same components as in the above-described first embodiment are designated by the same reference numerals, and their explanation will be omitted.

However, 71.72.73, 74.75 are piping 12.1
Bonda 21.22 in the middle of 3, 14, 31.42
．． 23. '34.45, each of which is equipped with a flow rate transmitter 76,77,78, which transmits a flow rate signal proportional to the measured flow rate.
79.80 is installed, and each flow rate transmitter 76-80 is connected to the control device 6 via signal lines 81, 82.83, 84.85.
1, and is configured so that the measured flow rate can be inputted every moment.

The coating apparatus used in this embodiment is constructed as described above, but is based on the flow rate signals from the flow rate transmitters 76 to 80 instead of the supply amount signals from the rotation detectors 56 to 60 in the first embodiment. The coating method is substantially the same as that of Example 291, except that the mixing ratio is controlled.

However, in this embodiment, the pon 7" is 21 to 23 degrees 34
．． Since the flow rates n171 to 75 are inserted into the discharge side of the pump 45 and the mixing ratio is controlled by directly measuring them, more accurate management can be achieved.

FIG. 3 shows a third embodiment of the present invention, in which the same components as those of the first embodiment described above are denoted by the same reference numerals, and their explanations will be omitted.

However, 91 indicates a color change valve device, and the color change valve device 91 includes a manifold 92 having a passage 92A inside, an air valve 3 and a thin valve 4 whose outflow side is connected to the passage 92A.
, a plurality of main agent valves 5 + 6 p 7 , a hardening agent valve 28 and an additive valve 39 , and a plurality of main agent valves 5 + 6 p 7 , a curing agent valve 28 and an additive valve 39 , and the outflow side of the manibold 92 is The line mixer 50 is in contact with the inflow side of the line mixer 50.

The coating device used in this embodiment has the configuration as described above, and each manifold 2, 26, 37 in the first embodiment
By using one manifold 92, the main agent supply system, hardening agent supply system, and additive supply system can be directly connected to the manifold 92, and the thinner valve 2 can be connected directly to the manifold 92.
7.38 can be made unnecessary. Further, in this embodiment, since the main agent, curing agent, and additive are mixed and flowed through the outflow pipe 93, the mixing effect in the line mixer 5o can be enhanced. Furthermore, the check valves 51 to 53 in the first embodiment can be made unnecessary. Except for the above points, this embodiment is the same as the first embodiment in that painting is performed while controlling the mixing ratio.

In addition, in each of the above-mentioned examples, a case was described in which a three-component reaction-curing paint consisting of a base agent, a curing agent, and an additive was used. It is suitable for use with low-viscosity polyurethane resin paints, unsaturated polyester resin paints, etc., and when mixing surface tension lowering agents and curing retarders. On the other hand, in the case of two-component reaction-curing paints that use high-viscosity, high-solid paints for thick coatings, solvent-free polyurethane resin paints, epoxy resin paints, etc., additives are not required. be. Further, the motors 24 and 35.degree. 46 are not limited to electric motors, but air motors may be used, and in this case, an electro-pneumatic converter may be used. Alternatively, the curing agent switching valve device 25 and the additive switching valve device 36 may be provided with air valves. Furthermore, although the line mixer 50 is used as the mixing means, for paints with a short pot life, an internal mixing type atomizer in which the mixing mechanism is provided inside the atomizer 55 may be used. Furthermore, although it has been described that the base agents of colors A, B, and C are stored in the base agent sources 15 to 17, different types of base agents such as polyurethane resin paint, epoxy resin paint, unsaturated polyester resin paint, etc. It may be something to store. Furthermore, in the third embodiment, the rotation detector 56
~60, flowmeters 71~75 as in the second embodiment
Of course, it is also possible to use .

The method for applying a reaction-curing paint according to the present invention is as described above in detail, and since the mixing ratio is controlled while detecting the amount of supply supplied from each supply system, fluctuations in the amount of supply, Even if there are changes in the surrounding conditions, a highly accurate mixing ratio can be maintained at all times, and automatic color changes or automatic base agent changes can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing a first embodiment used in the present invention, FIG. 2 is a system diagram similarly used in the second embodiment, and FIG. 3 is a system diagram similarly used in the third embodiment. 1.91...Color change valve device, 11,30,41...Thinner source, 12,13,14,47...Main agent piping, 15
．． 16,17...Main agent source, 21,22,23°34.
45...Pump, 24,35.46...Motor, 2
5... Curing agent switching valve device, 31.48... Curing agent piping, 32... Curing agent source, 36... Additive switching valve device, 42, 49... Additive piping, 43. ...Additive source, 50...Line mixer, 54...Paint pipe, 5
5... Painting machine, 56, 57, 58, 59.60...
Rotation detector, 61... Control device, 62... Mixing ratio setting device, 71° 72.73, 74, 75... Flow meter,
76.77°78.79.80...Flow rate transmitter.

Claims (2)

[Claims] (1) A mixture is made by mixing the base agent and hardener supplied from the base agent supply system and the hardener supply system, respectively, and this mixture is sprayed from the inspection machine toward the object to be coated. In this reaction-curing paint coating method, the supply amounts supplied from the base agent supply system and the curing agent supply system are detected, and the supply pressure and the preset mixing pressure of the base resin and curing agent are controlled. In comparison, a method for applying a reaction-curing paint is characterized in that the supply amount of the base agent and curing agent is controlled so as to achieve a preset mixed pressure. (2) A mixture of the base agent, hardener, and additives supplied from the base agent supply system, curing agent supply system, and additive supply system is made by mixing them, and this mixture is transferred from the coating machine to the object to be coated. In a method for applying a reaction-curing paint in which the paint is sprayed toward A reaction-curing paint characterized in that the supply amount of the base agent, curing agent, and additive is controlled so as to achieve a preset mixture extrusion by comparing the extrusion mixture with a preset extrusion mixture. Painting method.