JP2007061801A - Coating paint temperature-regulating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for regulating a paint temperature to an optimum paint viscosity in a coating paint. <P>SOLUTION: A main body of heat exchanger is made to be a simple liquid-liquid type heat exchanger and, changing the idea of making a heat exchanging coil to be heated in the heat exchanger, a system for adjusting viscosity is applied by directly heating a coating paint in the heat exchanger. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for controlling the temperature of a coating paint functioning so as to keep the viscosity of the coating paint constant by a simple mechanism.

  In general, in the world of paint, solvent-based paints such as water-based paints and solvent-based paints, which are expected to increase in the background of the social needs of VOC suppression in recent years, are in the form of paints. Regardless, it is no exaggeration to say that the quality of the finished paint is determined by the temperature control of the paint. In general, the finished state of painting tends to be greatly influenced by the ambient temperature at which the paint is applied, regardless of the material and reaction mechanism of the paint. That is, in summer, the coating environmental temperature tends to be too high, the coating viscosity is remarkably lowered, and the coating sagging tends to be difficult. On the other hand, in winter, the temperature of the coating environment is lowered and the viscosity of the paint is increased, so that the leveling property of the paint is extremely deteriorated. It was very difficult to manage the state of the film.

  The method generally used as a method for controlling the temperature change that occurs every season of the paint is a solvent-type paint. As a means for adjusting the paint viscosity, the viscosity is finely adjusted by adding a solvent. Although this method is a general method, there is a risk of deteriorating the physical properties of the coating film due to the addition of a solvent. However, there was only a method for calculating how to keep the coating temperature constant after finely adjusting the solid content of the coating, and it was extremely difficult to manage the coating film during coating.

By the way, the following patent documents have already been disclosed as one method for controlling the temperature of the paint during painting.
JP-A-6-210232

  Patent Document 1 discloses a case relating to a paint supply device that keeps the paint temperature constant during painting.

  An outline of the known paint supply apparatus will be described below based on the schematic view of the apparatus shown in FIG.

  The known paint supply apparatus is schematically shown in FIG. 1 and is disposed in a paint can 12 filled with a paint 11 to be heated, and is coated with the paint 11 to be heated. A paint circulation system is constituted by a paint feed pipe 15 for feeding the apparatus 13 with a pump 14 and a paint return pipe 16 for returning the surplus (overflow) paint in the paint apparatus 13 into the paint can 12 again. Further, a thermometer 17 for constantly measuring the liquid temperature of the paint 11 to be heated, and the actual temperature of the paint 11 to be heated measured by the thermometer 17 and the preset paint to be heated. And a temperature-adjusting water snake tube 18 for controlling the temperature of the paint 11 to be heated by comparing the temperature difference with the temperature 11. Reference numeral 19 denotes a paint stirrer that works so that the paint 11 to be heated always has a uniform temperature in the paint can 12.

  By configuring the coating material supply apparatus as described above, a constant amount of paint can be obtained without being affected by the heat of the coating apparatus and the paint piping in the paint circulation from the paint can 12 to the paint can 12 and further to the paint can 12. It becomes possible to keep the paint temperature, that is, a constant paint viscosity, and it will not cause a coating failure due to a change in the paint temperature during coating (such as a change in coating film thickness over time), enabling stable coating. And the effectiveness of the paint supply device.

  By the way, in the known paint supply device, the temperature-adjustable water snake pipe in which the paint 11 to be heated filled in the paint can 12 is contained in the paint 11 to be heated filled in the paint can 12. The heat is exchanged by the heat energy of the water circulating in 18 and the temperature of the paint 11 to be heated is controlled so as to be the desired paint temperature, but the paint can 12 is filled. Compared with the total heat capacity of the coating material 11 to be heated, the heat capacity of the water circulating in the temperature-adjusting water snake tube 18 to be temperature-controlled is determined by its volume (volume) and specific heat in terms of the temperature control system configuration. In order to increase the thermal efficiency of the temperature-adjusted water snake tube 18, the heat transfer area of the temperature-adjusted water snake tube 18 is greatly increased. Or by taking measures such as increasing the flow rate of the water circulating in the temperature-adjusting water snake pipe 18 and making the temperature of the water significantly larger than the temperature of the paint 11 to be heated. The fact was that we couldn't take good measures.

  However, if the heat transfer area of the temperature-adjusted water snake tube 18 is greatly increased, or if the flow rate and temperature drop of the water circulating in the temperature-adjusted water snake tube 18 are increased significantly, The known coating material supply apparatus has a problem in system design, such as a complicated control system for controlling the circulating water and increasing the cost.

  The present inventor comprehensively studied the problems of conventionally known paint supply devices, and made a simple device so that the paint temperature was kept constant throughout the four seasons without incurring excessive costs, and with high efficiency. We reviewed the overall system so that it could be replaced, and came to invent a paint temperature control device with good cost performance.

  The present invention aims to solve the above-mentioned problems of the prior art, and the present inventor has tried to change the way of thinking in order to achieve the purpose of solving the problems. First, in the above-described known example, the idea of reversal is attempted to replace the paint to be heated and the water circulating in the temperature-adjusting water snake pipe 18, that is, the heat medium for heat exchange (in this case, the heat medium is water). It was decided. In other words, according to this known example, the role of the heated paint filled in the paint can 12 is the role of water circulating in the temperature-adjusted water snake tube 18, while the temperature-adjusted water snake tube This is just a change of concept that the role of water circulating in 18 is replaced by the role of paint to be heated.

  As described above, the heated side, that is, the heated paint side, has a volume (volume) that is small and has a small heat capacity, and the heated side, that is, the role of the temperature-adjusted water It was discovered that by changing the idea of replacing the role of paint to be heated with a large volume) and a large heat capacity, the heat exchange efficiency during heat exchange can be greatly increased. The present invention has been completed.

  FIG. 2 is a schematic view showing the concept of the coating paint temperature control apparatus according to the present invention, and the details thereof will be described below.

  In FIG. 2, a block 20 surrounded by an alternate long and short dash line shows an outline of the entire coating paint temperature control apparatus according to the present invention. The coating paint temperature control apparatus 20 includes a heat exchanger main body 21 (FIG. 3). And the temperature controller 22 connected to the heat exchanger main body 21. And the said heat exchanger main body 21 is filled so that the inside of the said filling space may be filled in the said filling space 21b in the said filling space 21b, the filling space 21b provided in the housing 21a which comprises the heat exchanger main body, and the said housing. A liquid heat exchange medium 21c and a heat exchange coil 21d to be heated for exchanging heat based on the thermal energy of the liquid heat exchange medium 21c are disposed.

  Further, as shown in the figure, the temperature controller 22 connected to the heat exchanger body 21 is connected to the heat exchanger body 21 and communicates with the forward piping 22a for circulating the liquid heat exchange medium 21c. The return pipe 22b circulates the liquid heat exchange medium 21c from the container body 21 side to the temperature controller 22 side. In addition, the temperature controller 22 main body always includes a circulation heat pump (not shown) that circulates the liquid heat exchange medium 21c at a set flow rate in the heat exchanger main body 21 and the liquid heat exchange medium 21c. An automatic temperature adjusting device (not shown) for adjusting the temperature of the liquid so as to be a predetermined temperature set is included.

  On the other hand, one pipe of the heat exchange coil 21d for heating to be disposed in the filling space 21b filled with the liquid heat exchange medium 21c in the heat exchanger main body 21 is outside the system of the paint temperature controller 20 for coating. The other pipe is connected to a coating device (painting GAN) 24 disposed outside the coating paint temperature adjusting device 20. Reference numeral 25 denotes a temperature sensor installed on the outlet side of the heat exchange coil 21d to be heated disposed in the heat exchanger main body 21, and the coating state of the paint 26 in the coating device (painting GAN) 24, That is, the state of the viscosity of the paint 26 is judged, and the temperature of the paint for coating, that is, the paint temperature is constantly monitored so that the paint viscosity always becomes a constant temperature / viscosity, and the electric signal ( The two-dot chain line) is fed back to play a role of automatically adjusting the temperature of the liquid heat exchange medium 21c filled and circulated in the heat exchanger main body 21 to a predetermined temperature.

  By the way, in the above description, the liquid heat exchange medium 21c in the coating paint temperature control apparatus according to the present invention generally uses water such as antifreeze liquid, but it is economical. In this case, the liquid heat exchange medium 21c is not limited to water. That is, as an example other than water, an organic heat medium, for example, alkylbenzene, alkylnaphthalene, alkylbiphenyl, benzyl, dibenzyl, mineral oil, fluorine, arylalkyl, and the like can be selected. Moreover, a molten salt system can be selected as the inorganic heat medium. In short, considering the type of paint to be painted, the selection may be made as appropriate in view of the correlation between the optimum viscosity of the paint and the paint temperature and the economy.

  Next, the operation state of the system in the coating material temperature control apparatus 20 configured as described above according to the present invention will be described with reference to FIGS.

  2 and 3, the coating paint 26 delivered from the paint supply device 23 is first sent to the heat exchanger body 21, filled in the heat exchanger body 21 and circulated at a constant temperature. It is sent to the heat exchange coil 21d for heating installed so as to be immersed in the exchange medium 21c. Further, the coating material for coating 26 is heat-exchanged by obtaining heat energy of the liquid heat exchange medium 21c in the heat-exchanging coil for heating 21d, heated to a set coating temperature, and then applied to the coating material coating apparatus. 24. By the way, the viscosity (temperature) adjustment of the coating material 26 in the coating material temperature adjusting device 20 is set on the outlet side of the heat exchange coil 21d to be heated after grasping the coating state on the coating material device 24 side. The temperature of the coating temperature sensor 25 is grasped, the necessity of further increasing or decreasing the viscosity is determined, and then the temperature of the coating material temperature adjusting device disposed in the system of the coating material temperature adjusting device 20 is also adjusted. What is necessary is just to adjust and set temperature so that the temperature setting of the temperature setting apparatus (not shown) provided in the apparatus 22 may become predetermined | prescribed temperature.

  In addition, in the coating material temperature control apparatus 20 according to the present invention, by using various coating materials whose viscosity is adjusted to be relatively high, the temperature change of the temperature depending on the season such as spring, summer, autumn and winter It is necessary to adjust the various coating paints in the direction of heating so that the viscosity of the various coating paints becomes the optimum viscosity with respect to the viscosity change accompanying the daily temperature change. Therefore, in the coating paint temperature control apparatus 20 according to the present invention, adjustment in the direction of cooling various coating paints and increasing the viscosity of the coating increases the cost in designing the coating paint temperature control apparatus according to the present invention and is not effective. .

  As described above, in the coating material temperature control apparatus according to the present invention, the heat exchanger body is a liquid-liquid type heat exchanger, and the heat exchange coil in the heat exchanger is the non-heating side. By adopting a system in which the coating paint is directly heated and the viscosity is adjusted, the heat exchange efficiency can be dramatically increased as compared with the conventional apparatus shown in FIG. Therefore, the viscosity of the paint can be finely adjusted with good response to changes in the temperature in the four seasons and changes in the temperature in the day. On the other hand, if the initial viscosity setting of various paints is set high, the viscosity of the paint can be adjusted only by increasing the paint temperature. It became possible to push low compared to.

  In the coating paint temperature control apparatus according to the present invention, the heat exchanger body 21 shown in FIGS. 2 and 3 has the following specifications, and the liquid #heat exchange medium 21c circulating in the heat exchanger body 21 is an antifreeze. Furthermore, the performance of the coating material temperature control apparatus according to the present invention was evaluated using a moisture-curing urethane-based paint: IMS-101 (manufactured by Ishimat Japan) as the coating condition evaluation paint. The performance and evaluation are shown below.

Heat exchanger specifications

-Liquid heat exchange medium 21c capacity in the filling space 21b: 1785 cc
・ Material of heat exchange coil 21d for heating: Aluminum (pipe outer shape: 6φmm, pipe inner diameter: 5φmm)
-Heat transfer area of the heat exchange coil 21d for heating: 0.019m ²
-Paint flow rate in the heat exchange coil 21d for heating: 30g / min

Performance of paint temperature controller for painting

-Set temperature of liquid heat exchange medium 21 (antifreeze): 40 ° C
-Paint charging temperature to heat exchanger body 21: 10 ° C to 12 ° C
・ Viscosity of paint applied to heat exchanger body 21: 20Sec (Ford Cup: # 4)
-Paint discharge temperature at the outlet of the heat exchanger body 21: 35 ° C to 38 ° C
-Paint discharge viscosity at the outlet of the heat exchanger body 21: 9Sec (Ford Cup: #)

Evaluation of paint temperature controller for coating

・ Moisture-curing urethane paint that has become highly viscous due to the influence of outside air temperature increases the paint temperature instantaneously through the paint temperature control device for painting according to the present invention, making it ideal for painting work. The coating temperature, that is, the viscosity was adjusted.

  In the coating paint temperature control apparatus according to the present invention, the heat exchanger body 21 shown in FIGS. 2 and 3 has the following specifications, and the liquid heat exchange medium 21c circulating in the heat exchanger body 21 is an antifreeze. Furthermore, the coating state temperature control device for coating according to the present invention is used by using a polyurethane acrylate-based UV curable coating material: IMS-010 (manufactured by Ishimat Japan) as a prepolymer for coating state evaluation. Evaluated. The performance is shown below.

Heat exchanger specifications

-Liquid heat exchange medium 21c capacity in the filling space 21b: 1785 cc
・ Material of heat exchange coil 21d for heating: Titanium (pipe outer shape: 6φmm, pipe inner diameter: 5φmm)
-Heat transfer area of the heat exchange coil 21d for heating: 0.019m ²
-Paint flow rate in the heat exchange coil 21d for heating: 30g / min

Performance of paint temperature controller for painting

・ Set temperature of the liquid heat exchange medium 21 (antifreeze): 60 ° C
-Paint charging temperature to heat exchanger body 21: 10 ° C to 12 ° C
・ Viscosity of paint applied to heat exchanger main body 21: 24Sec (Ford Cup: # 4)
-Paint discharge temperature at the outlet of the heat exchanger body 21: 40 ° C to 48 ° C
・ Viscosity of paint discharged from the heat exchanger body 21: 11Sec (Ford Cup: # 4)

Evaluation of paint temperature controller for coating

・ Moisture-curing urethane paint that has become highly viscous due to the influence of outside air temperature increases the paint temperature instantaneously through the paint temperature control device for painting according to the present invention, making it ideal for painting work. The coating temperature, that is, the viscosity was adjusted.

The figure which shows the schematic of a well-known coating material supply apparatus. Schematic which shows the concept of the coating-material temperature control apparatus which concerns on this invention. The figure which shows the detail of the heat exchanger main body in this invention.

Explanation of symbols

11: Paint for heating 12: Paint can 13: Coating device 14: Pump 15: Paint feed pipe 16: Paint return pipe 17: Thermometer 18: Temperature adjusting water serpentine 19: Paint stirrer 20: For coating according to the present invention Schematic diagram of the entire paint temperature control device 21: heat exchanger body 21a: housing 21b: filling space 21c: liquid heat exchange medium 21d: heat exchange coil 22 for heating: temperature regulator 23: paint supply device 24: coating device ( Paint GAN)
25: Temperature sensor 26: Paint for coating

Claims (3)

  The housing constituting the heat exchanger main body has a filling space filled with the liquid heating heat medium, the liquid heating heat medium filled in the filling space, and further, the liquid heating heat medium. A heat exchanger main body constituted by a heat exchange coil for heating to perform heat exchange in the presence of heat energy, separately prepared outside the system of the heat exchanger main body, filled in the heat exchanger, and A paint for coating comprising: a temperature regulator for regulating the temperature of the liquid heating heat medium itself forcibly circulated, wherein the paint for heating is contained and transferred in the heat exchange coil for heating Temperature control device.   2. The coating paint temperature control apparatus according to claim 1, wherein the heating medium for liquid heating is composed of water (antifreeze water).   2. The coating paint temperature control apparatus according to claim 1, wherein the liquid heating heat medium is composed of a heat medium having a large heat storage capacity other than water (antifreeze water).

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