JP2013215635A - Manufacturing method of protective coating film and booth used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems of a protective coating film for protecting a coating surface of a body of an automobile, in which it takes time to dry it, and foreign matter is mixed.SOLUTION: In a sealed space different from a location of performing a base treatment step, steps of coating and drying are performed. In the sealed space, dust resistance is excellent, drying by entire surface irradiation to a body of an automobile by a plurality of infrared light sources can be performed, the management of temperature or the like is easy. As a result, not only the drying time is shortened and foreign matter contamination is prevented, but also a uniform protective coating film without irregularities can be obtained.

Description

  The present invention relates to a coating for protecting the painting of an automobile body.

  As a full-fledged coating technology for protecting automobile body painting, there is a coating technology generally called glass coating. The protective coating film produced by this coating technique protects the painted surface for a very long time, and can prevent, for example, rain stains and scratches caused by car washing.

  The production process of the protective coating film includes polishing and washing as a pre-process for applying the coating agent, a coating agent application step, and a drying step for drying the coating agent, and is generally performed by an automobile dealer or a specialist. Since the production process is complicated with expertise as described above, the construction cost is relatively expensive. Therefore, it is generally applied to luxury cars such as foreign cars and domestic high-end cars. Therefore, unlike the coating applied to building materials, home appliances, etc., the best coating finish is required. There is a need for a perfect coating that does not allow slight dust contamination or uneven coating.

  The reason why the protective coating of the automobile body is required to have the best coating finish is not only because of the above-mentioned problem of aesthetics, but also because of the performance aspect of protecting the painting. In other words, automobiles may run for a long time under scorching hot weather, and may be stored for a long time in rainy weather parking lots. This is because there is a risk that corrosion or the like occurs from minute defects.

  In this coating technique, an inorganic glass coating agent is used as a coating agent, which is applied to a painted surface and dried to obtain a silica glass coating. Some use glass fiber polymer, silane compound, or silicone resin instead of the inorganic glass coating agent. Regardless of which coating agent is used, sufficient drying is required in order to improve the coating performance, the durability of the coating film, and the adhesion to the paint.

However, until the solvent contained in the coating agent is removed and the chemical reaction is sufficiently advanced to obtain a strong protective coating film, it takes a period of one month when left at room temperature.
In addition, dust and polishing powder are mixed in the protective coating film, and the appearance is deteriorated, or the mixed portion becomes defective, and the durability of the protective coating is deteriorated.

  A method for promoting drying and preventing dust and the like from being mixed has been proposed, mainly for drying related to automobile painting. Evaporation of the solvent, that is, drying can be promoted by flowing a linear air jet along the body of the automobile to be dried and replacing the evaporated solvent with air. Moreover, since an air jet flows along a body, mixing of dust etc. is prevented by reducing entrainment of dust etc. Furthermore, by using the IR heating panel, the temperature of the object to be dried can be increased by the radiant heat, and the drying time can be further shortened. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 6-3221

  However, since it takes a long time to dry the protective coating film as compared with the coating, it is impossible to reduce the practically sufficient time by drying with an air jet. Further, in order to improve the adhesion between the protective coating film and the painted surface and to obtain a protective coating film with high hardness, it is desirable that the temperature of the drying atmosphere is room temperature or higher, for example, about 90 degrees Celsius. From this point of view, it is effective to use an IR heating panel. However, since the temperature rise by the IR heating panel is a local temperature rise, there is a problem that uneven drying remains and a uniform protective coat film cannot be formed on the entire body surface.

  Furthermore, since the coated surface is polished as a pre-process for applying the protective coating film, there is a large risk of contamination of polishing powder accompanying the polishing.In the method using an air jet, for example, even if the jet is along the body, polishing is performed. There was a possibility that the powder was mixed into the protective coating film.

  The present invention has been made in order to solve the above-mentioned problems, significantly reducing the time required for the drying process, minimizing the mixing of dust and polishing powder, and having high adhesion over the entire body surface. The present invention provides a method for producing a protective coating film on a painted surface of an automobile body that can satisfy the properties required for properties and other protective coatings.

  A method for manufacturing a protective coating film for protecting a vehicle body according to the present invention includes a ground treatment process including polishing and cleaning of a vehicle body, and the automobile is moved to a substantially sealable space having a dustproof function after the ground treatment process. A moving process, a coating process in which a protective coating agent is applied to substantially the entire painted surface of the automobile body in a substantially sealable space after the moving process, and a painted surface of the automobile body by a plurality of infrared light sources after the coating process. And a drying step of drying the protective coating agent applied by irradiating the substantially entire surface with infrared rays. In particular, in the drying step, temperature control is performed by adjusting the amount of infrared irradiation.

  Moreover, the booth used for manufacturing the protective coating film for protecting the automobile body according to the present invention has a space in the booth that can accommodate the automobile, and this space is a substantially sealable space having a dustproof function. Yes, this space has a plurality of infrared light sources for raising the temperature of the protective coating film disposed on the side walls and the ceiling, a temperature sensor for measuring the temperature raised by these infrared light sources, and a step of applying a protective coating agent Temperature control is possible by adjusting multiple illuminations for observing scratches on the body of the car or uneven application of the coating agent inside, before and after, and adjusting the amount of intake, exhaust, and infrared rays. And a control mechanism.

  Since the manufacturing method of the protective coating film according to the present invention is configured as described above, the time required for the drying process is remarkably reduced, and mixing of dust and polishing powder is minimized, and the entire body is covered. It is possible to produce a protective coating film for a painted surface for automobiles that can satisfy high adhesion and other characteristics required as a protective coating and is visually excellent.

Process drawing showing the process of the manufacturing method of the protective coat film concerning this invention The figure which shows the mode of the movement process which concerns on this invention The figure which shows the structure of the application | coating and drying booth which concerns on this invention

Embodiment.
Hereinafter, an embodiment of a method for producing a protective coating film relating to a painted surface of an automobile body according to the present invention will be described with reference to the drawings. The following embodiment is an example of the present invention, and the present invention is not particularly limited to this example. Further, the present invention can be applied not only to a painted surface of an automobile body but also to a protective coating film related to a painted surface of a motorcycle or the like.

  FIG. 1 is a process diagram showing the steps of a method for producing a protective coat film according to the present invention. The production of the protective coating film is mainly composed of four steps: a base treatment step, a transfer step, a coating step, and a drying step. Hereinafter, each step will be described in order.

<Ground treatment process>
First, the ground treatment process will be described.
The ground treatment process is a process performed to repair a scratch on the painted surface and to obtain a painted surface that is compatible with the protective coating agent.

  First, the painted surface is degreased and cleaned. Degreasing is performed by washing with a sponge using a degreasing detergent and then pouring water over the detergent.

  Next, iron powder is removed from the painted surface as necessary. Iron powder removal may be performed by using an iron powder remover, but without using the iron powder remover, it is also possible to remove the iron powder by scrubbing the body with clay while applying water to the body.

  After removing the iron powder, the painted surface is polished. When the painted surface is polished, masking is first performed using a masking tape so that the resin portion adjacent to the painted surface is not polished.

  Next, polishing is performed using a solvent and a buff. By pressing the rotating buff with a slight force against the painted surface with a small amount of solvent, the painted surface is polished, the scratches are repaired, and a glossy painted surface is obtained.

Finally, degreasing and cleaning are performed again to remove the abrasive powder and the oil component of the solvent. Furthermore, the painted surface is made clean by washing with water.
Thus, the ground treatment process is completed.

<Transfer process>
Next, the moving process will be described.
A movement process is a process of moving a motor vehicle.
Since polishing was performed in the ground treatment process, the polishing powder for coating and the solvent for polishing are scattered around the automobile, and they may be mixed into the protective coating film in the subsequent coating process and drying process. Move the car to a clean place prior to the painting process. Movement is done by driving a car.

  FIG. 2 is a diagram showing a state of the moving process according to the present invention. FIG. 2 shows the lower left automobile moving toward the coating / drying booth 1 which is a clean place. When the automobile is moved to the coating / drying booth 1, the door 2 provided in the coating / drying booth 1 is opened as shown in FIG. After the movement is completed, the door 2 is closed, and the coating / drying booth 1 becomes a dust-proof environment where dust from the outside does not enter. The door 2 is provided with a dustproof packing, and has a structure that prevents intrusion of dust and the like from the gap.

  The door 2 is provided with an inlet 3 for taking in outside air from the outside. A dust-proof filter is attached to the suction port 3 so as to prevent dust from entering.

<Application process>
Next, the coating process will be described.
The automobile moved to the application / drying booth 1 is applied with the protective coating agent in a clean environment in the application / drying booth 1.

First, the structure of the coating / drying booth 1 will be described with reference to FIG.
In FIG. 3, the left and right walls are provided with a plurality of side-side infrared light sources 4 capable of irradiating infrared light mainly on the side surfaces of the automobile. In FIG. 3, only one infrared light source provided on each of the right and left walls is provided with a lead wire for easy viewing, but the same shape arranged in a horizontal row is also the side infrared light source 4. . Note that a lead wire is attached in a similar manner to the upper surface infrared light source 5, the side surface illumination 6, and the upper surface illumination 7, which will be described later.
The position where the side infrared light source 4 is provided is a height near the center of the side body of a standard vehicle type. In order to efficiently emit radiation from the infrared light source to the side body, it is installed at such a height. Since the height of the body varies depending on the vehicle type, the position of the infrared light source may be moved up and down.

  In addition, a plurality of upper surface infrared light sources 5 capable of irradiating infrared light mainly on the upper surface of the body of the automobile are provided on the ceiling. Since the height of the upper surface of the body also varies depending on the vehicle model, the position of the infrared light source may be moved up and down.

  The left and right walls are provided with a plurality of side illuminations 6 for observing scratches on the automobile body or uneven application of the coating agent before and after the step of applying the protective coating agent. The protective coating film on the painted surface of the automobile body is required to have the best finish due to the demands of automobile owners who take great care of their car. For example, a minute scratch on the coated surface, uneven coating, or dust mixed in the protective coat is surely found, and the process may be repeated if necessary. In order to find such minute scratches and the like, various devices are necessary for illumination.

  For example, as shown in FIG. 3, the side illuminations 6 provided on the left and right walls are located below the infrared light source. By illuminating the body of the car from this position, it is easy for an operator who usually observes from a position higher than the body to find a flaw. This is because minute scratches and the like are most easily seen from an angle at which the light reflected from the body is viewed directly.

A plurality of upper surface illuminations 7 are provided on the ceiling, and the entire room is maintained at a brightness necessary for work, and is used for observing scratches on the upper surface of the body.
Furthermore, since the illumination color that makes it easy to see minute scratches and the like differs depending on the color of the body of the automobile, the illumination color may be changed according to the color of the body of the automobile to be coated.

  As can be seen from FIG. 3, the side wall of the coating / drying booth 1 has a white color, and the floor has a color that hardly reflects black light. This is also a device for making it easy to see scratches and the like. The color of the side wall, which is the background color when observing the body, is most suitable for finding scratches and the like. On the other hand, if there is reflection of illumination from the floor, it will interfere with the observation of the side of the body, so the floor color should be black, which hardly reflects visible light.

The coating / drying booth 1 is also provided with a temperature sensor 8 and an exhaust port 9.
The temperature sensor 8 is used for temperature control in a drying process described later.
The exhaust port 9 is provided mainly for the purpose of exhausting the solvent from the protective coating agent. Thereby, in an application process, it can reduce as much as possible that the worker who performs application takes in a solvent, and in the drying process mentioned below, evaporation of a solvent can be accelerated and drying can be accelerated.

Next, the protective coating agent used in the coating process will be described.
There are many protective coating agents used for the protective coating of paint, but a typical one is obtained by dissolving perhydropolysilazane in a solvent and adding a small amount of a catalyst. This protective coating agent reacts with moisture in the atmosphere and is converted to silica glass.

In addition, there is a type in which a glass-based coating agent based on alkoxysilane, which is a hydrogen compound of silicon, and a super-water-repellent top coat containing a glass-based primer coat and a fluorine-based component are applied in two layers. Further, a silicone resin-based protective coating agent containing a dimethylsiloxane polymer is also used.
All of the protective coating agents have excellent properties as protective coatings such as high antifouling properties, anticorrosion properties, and scratch resistance properties, and are widely used for protecting automobile bodies.

  In the following explanation regarding the coating process and the drying process, the process when the protective coating agent mainly composed of perhydropolysilazane is used will be mainly shown, but the same applies basically even when other protective coating agents are used. A protective coat film can be formed using this process.

  The coating process is performed by placing the automobile at the center of the coating / drying booth 1. Apply protective coating to the entire car body. Apply not only the painted surface but also resin parts such as bumpers.

Application is done by hand painting with a spray gun or cloth. In general, a protective coating agent having a low viscosity is used by a spray gun, and a protective coating agent having a high viscosity is manually applied by a cloth. Since the protective coating agent mainly composed of perhydropolysilazane has a low viscosity, it is applied by spraying using a spray gun.
After coating, it is confirmed that there is no coating unevenness of the protective coating film or dust.

<Drying process>
The drying process which is the last process will be described.
Drying is also performed in the coating / drying booth 1 where the protective coating agent is applied. By performing drying at the place where the application is performed without moving the automobile after application, the risk of foreign matters such as dust entering the protective coating film before drying can be reduced.

  The protective coating film is dried by irradiating the side infrared light source 4 and the upper surface infrared light source 5 toward the automobile body. During drying, the temperature in the coating / drying booth 1 is monitored by the temperature sensor 8 and the temperature is controlled so that the resin parts such as bumpers are not damaged and the temperature does not rise too much. The current supplied to the side infrared light source 4 and the top infrared light source 5 is controlled so that the temperature indicated by the temperature sensor 8 is substantially constant at 95 degrees Celsius, and drying is performed for about 10 minutes. Although the temperature is 95 degrees Celsius here, this temperature may be further increased or decreased depending on the durable temperature of the resin portion.

  In order to achieve a high temperature of 95 degrees Celsius by infrared irradiation, a considerably large irradiation amount is usually required. However, since it is carried out in the substantially sealed coating / drying booth 1, there is little escape of heat to the outside, and the temperature can be raised with a relatively small dose. Further, if a heat insulating building material is used for the walls and ceiling of the coating / drying booth 1, this effect can be further enhanced.

  After completion of drying, the surface finish is visually observed. If there are no problems, all steps are completed.

  In order to monitor the temperature, the temperature sensor 8 installed near the center of the ceiling of the coating / drying booth 1 is used. However, the surface temperature of the automobile body may be monitored using an infrared radiation thermometer. . In particular, if a plurality of locations on an automobile body are monitored using an infrared radiation thermometer, the amount of radiation from a plurality of infrared light sources is controlled, and the temperature at the plurality of locations is controlled to be equal, a more uniform protective coat film can be obtained. Fabrication is possible.

  Further, a humidifier may be installed in the coating / drying booth 1 so that the humidity in the coating / drying booth 1 is controlled to be higher than the outside air for drying. Since the curing of the protective coating agent proceeds by a chemical reaction with moisture contained in the atmosphere, the drying time can be shortened in a humidified environment, and at the same time, a higher-grade protective coating film can be obtained.

  As a drying method, natural drying is possible, but the progress rate of the chemical reaction, which is the curing process of the protective coating agent, is very slow at room temperature, and the period required to obtain a practical curing state is protective coating. Depending on the drug, it takes 2 weeks to 1 month. In the case of drying using infrared rays, a practical cured state can be obtained in about 5 to 10 minutes. Further, in the case of drying using infrared rays, there is an effect of increasing the hardness of the protective coating film and improving the adhesion to the painted surface as compared with natural drying.

  A near infrared light source was used as the side infrared light source 4 and the top infrared light source 5. It is possible to use a far-infrared light source or a mid-range infrared light source that is the wavelength region between the near-infrared and far-infrared, but for the purpose of drying the protective coating agent, the near-infrared light source is optimal, A better protective coat film can be obtained. The reason for this is considered to be that near infrared rays reach the automobile body with almost no absorption by the protective coating film. That is, the near infrared rays do not directly heat the protective coating film, but first warm the automobile body, and the heat warms the protective coating by heat conduction. Therefore, the protective coating film is warmed not from the surface but from the inside. As a result, the solvent inside the protective coating film, which is normally difficult to evaporate, is likely to evaporate. Since the curing of the protective coating film occurs due to the reaction with moisture contained in the atmosphere, the curing proceeds from the film surface, but by allowing the solvent to evaporate from the inside of the film at an early stage where the surface curing is insufficient, It is considered that the film surface deterioration due to the evaporation of the solvent can be prevented, and a clean surface of the protective coat film can be obtained.

Further, in the present embodiment, using a plurality of infrared light sources installed in the coating drying booth 1, drying was performed by a method of irradiating the entire automobile body with infrared rays, but using an infrared panel or the like as the infrared light source, A method of drying each part of the car in order is also conceivable. However, with this method, it is difficult to uniformly dry the protective coating film of the entire automobile body, and uneven drying tends to occur.
There are three reasons for this. The first reason is that the body of an automobile is a combination of shapes having different curvatures, and has an extremely complicated shape as a whole. For such a complicated shape, it is impossible to emit infrared rays from the infrared panel or the like to each part under the same radiation conditions.

  The second reason is that the temperature is less likely to rise at the end of the radiation area on the automobile body where infrared rays are emitted from an infrared panel or the like as compared with the central portion. In particular, in the case of a material having good heat conduction such as an automobile body and having a large volume, heat escape is significant due to heat conduction, and the temperature decreases as it goes from the center to the end of the radiation region. It becomes prominent and drying under uniform conditions is difficult. In particular, when radiation is simultaneously applied to the paint part and the resin part, the lack of uniformity becomes very remarkable, and quite clear drying unevenness often appears.

  The third reason is a problem resulting from the long drying time. As described above, in this embodiment, the drying time is completed in about 5 to 10 minutes. On the other hand, when an infrared panel or the like is used, it takes a very long time from the start to the end of drying. For example, if each part of the automobile body is divided into 20 parts and dried, it takes 20 times longer without considering the time for moving the irradiation position of the infrared panel or the like. Considering the time for moving the irradiation position, it takes a longer time. As a result, a time difference of 2 hours or more occurs between the portion where infrared irradiation is performed first and the portion where infrared irradiation is performed last. This time difference causes a difference in the cured state of the protective coat film surface. That is, the initial curing of the surface of the protective coating film applied to the last irradiated region has progressed to some extent. At this stage, if the solvent evaporates from the inside of the protective coating film, the film surface deteriorates and a clean surface cannot be obtained. However, this deterioration of the surface state is extremely slight, and is usually not detectable by human visual ability. However, if there are undegraded parts and degraded parts at the same time, that is, if the entire surface of the automobile body lacks uniformity in the surface condition of the protective coating film, human vision will catch it. Is possible. This is so-called “drying unevenness”, which causes a loss of aesthetics. The same can be said for the first and second reasons described above.

Of particular note here is that the uneven drying resulting from the above three reasons does not become noticeable in the drying of any coating, and the uneven drying does not occur in the drying of any coating. Is not important.
That is, the unevenness of drying becomes remarkable because the article to be coated has a complicated shape such as an automobile, is made of a material having good thermal conductivity, and has a large volume. And this level of “saliency” in dryness is regarded as a problem because the protective coating film for painting the automobile body requires a very high degree of perfection for the aesthetics, while at the same time driving and This is because it is a special product that requires a high degree of completeness in terms of performance to protect the paint from the storage environment.

  Further, in the present embodiment, it has been described that the temperature management is performed using the temperature sensor 8 in the coating / drying booth 1, and further the humidity management by humidification or the like is performed as necessary. It is also a feature of the present invention that it is easy to manage. Curing of the protective coating agent proceeds by a chemical reaction. Therefore, the finished state of the protective coat is easily affected by environmental conditions such as temperature and humidity in the drying process. Therefore, it is difficult to control environmental conditions by infrared irradiation using an infrared panel or the like, and for example, a difference occurs in the finished state of the protective coat in summer and winter. On the other hand, in the present embodiment, the coating / drying booth 1 which is a substantially sealed space for preventing dust is a space suitable for environmental condition control. Therefore, the environmental conditions for obtaining the best finish throughout the year are obtained. Easy to set up.

  The application / drying booth 1 used in the application and drying process is one substantially sealed room, but the application / drying booth 1 may be provided with a plurality of rooms, for example, two rooms. In this case, the entire drying booth 1 having two rooms has dustproof performance, illumination for observing scratches and the like is provided in the first room, and an infrared light source is provided in the second room. And it has an intermediate door that can be opened and closed to separate these two rooms. After application in the first room, the automobile is moved to the second room and dried. When drying, the intermediate door is closed to confine heat in the second room, and drying by infrared irradiation can be performed efficiently.

The features of the present invention are summarized below.
In the present invention, since the base treatment process, the subsequent coating process, and the drying process are performed in spatially different places, it is possible to manufacture a protective coat film with almost no foreign matter mixed therein.
Furthermore, by performing the coating process and the drying process in a substantially sealed space having dustproof performance, the probability that foreign matter is mixed into the protective coating film can be further reduced.

  Further, if the drying process is performed in a substantially sealed space, a necessary temperature rise can be achieved even with relatively small infrared irradiation, and energy costs such as electricity costs in the drying process can be reduced.

  In the present invention, by drying the protective coating agent by irradiating the substantially entire surface of the automobile body with infrared rays from a plurality of infrared light sources, the drying time is remarkably reduced, and the protective coating film having excellent hardness and adhesion In addition, the protective coat film is uniformly dried over the entire surface of the automobile body, and a visually excellent protective coat film can be manufactured.

Further, by performing temperature control in the drying process, it is possible to produce a protective coating film having good protective coating characteristics without impairing the heat resistance of the resin portion or the like. Furthermore, by using an infrared radiation thermometer to monitor a plurality of locations on the automobile body, drying under more uniform conditions can be realized.
In addition, by controlling the humidity in the drying process, the drying time can be further shortened, and the hardness of the protective coating film can be increased.
The substantially sealed space having dustproof performance is a space in which temperature and humidity are easily controlled.

In the present invention, since a near-infrared light source is used as the infrared light source, a good surface of the protective coating film without deterioration can be obtained.
Further, by arranging the infrared light source at appropriate positions on the side wall and ceiling of the coating / drying booth, the protective coating film can be satisfactorily dried over the front surface of the body, and the irradiation efficiency of the infrared light source can be increased.

  In the present invention, the coating / drying booth is provided with an intake port and an exhaust port to efficiently discharge the solvent from the protective coating agent to the outside of the booth, considering the health of workers, and speeding up the drying process. It can be performed.

  In the present invention, the application / drying booth is provided with a plurality of illuminations, particularly the illumination for observing the side of the body is provided below the infrared light source, and the color of the wall and floor is devised, so that the body scratches, It is possible to efficiently find application unevenness of the protective coating agent or contamination of foreign matter into the protective coat film, and it is possible to manufacture a good protective coat film.

1 Coating / drying booth 2 Door
3 Intake port 4 Infrared light source for side surface 5 Infrared light source for upper surface 6 Illumination for side surface 7 Illumination for upper surface 8 Temperature sensor
9 Exhaust port

A method for manufacturing a protective coating film for protecting a vehicle body according to the present invention includes a ground treatment process including polishing and cleaning of a vehicle body, and the automobile is moved to a substantially sealable space having a dustproof function after the ground treatment process. A moving process, a coating process in which a protective coating agent is applied to substantially the entire painted surface of the automobile body in a substantially sealable space after the moving process, and a painted surface of the automobile body by a plurality of infrared light sources after the coating process. A drying step of drying the protective coating agent applied by irradiating the substantially entire surface with infrared rays, and a substantially sealable space is formed in the vehicle body during and before and after the step of applying the protective coating agent. a plurality of illumination provided for observing the coating unevenness of the flaw or coating agents, in particular, in the drying step, to adjust the irradiation amount of infrared And performs temperature management in the.

Claims (8)

A method for manufacturing a protective coating film for protecting a body of an automobile,
A substrate treatment process including polishing and cleaning of the body of the automobile;
After the ground treatment step, a moving step of moving the automobile into a substantially sealable space having a dustproof function,
After the moving step, an application step of applying a protective coating agent over substantially the entire painted surface of the automobile body in the space;
After the coating step, a drying step of drying the protective coating agent by irradiating substantially the entire painted surface of the body of the automobile with a plurality of infrared light sources,
Have
In the drying process, the temperature is controlled by adjusting the irradiation amount of the infrared rays.   The method for producing a protective coating film according to claim 1, wherein the infrared ray is a near infrared ray.   The plurality of infrared light sources are provided on a side wall portion of the space and a side infrared light source group having a plurality of infrared light sources capable of irradiating infrared light mainly on a body side surface of an automobile, and mainly provided on a ceiling portion of the space. The method for producing a protective coating film according to claim 1 or 2, comprising an upper surface infrared light source group having one or a plurality of infrared light sources for irradiating infrared light onto an upper surface of a body of an automobile.   2. The space is provided with an intake port for taking in outside air from the outside and an exhaust port for exhausting to the outside, and the intake port is provided with a dustproof filter. 4. The method for producing a protective coating film according to any one of items 1 to 3.   The space is provided with a plurality of lights for observing scratches on the body of the automobile or uneven application of the coating agent before and after the step of applying the protective coating agent. The method for producing a protective coating film according to claim 3 or 4, wherein the protective coating film is also provided below.   The method for producing a protective coating film according to claim 5, wherein the floor surface of the space has a color that hardly reflects the illumination.   The method for manufacturing a protective coating film according to claim 5 or 6, wherein a side wall of the space is white. A booth used for manufacturing a protective coating film for protecting the body of an automobile,
The space inside the booth is large enough to accommodate a car,
The space is a substantially sealable space having a dustproof function,
The space is
A plurality of infrared light sources for heating the protective coating film disposed on the side wall and the ceiling;
A temperature sensor for measuring the temperature raised by the infrared light source;
A plurality of lights for observing scratches on the automobile body or uneven application of the coating agent during and before and after the process of applying the protective coating agent;
The air inlet,
An exhaust port;
A control mechanism capable of performing temperature management by adjusting the amount of irradiation of the infrared rays;
A booth used for manufacturing a protective coating film having