KR101293978B1 - Portable measuring device for moisture-resistance property of automotive paint - Google Patents

Abstract

The present invention deviates from the test method of evaluating moisture resistance by forming a coating film on a standard specimen in a laboratory in the laboratory, and is mounted directly on a part of a vehicle actually operated to evaluate the moisture resistance of the actual vehicle coating film. The present invention relates to a testing machine, and in particular, a vehicle of the present invention focusing on a part which is directly related to impact resistance due to chipping caused by chipping in the driving environment of an automobile and an anti-rusting weakness where quality problems have been caused due to deterioration of anti-corrosion resistance due to a decrease in moisture resistance and adhesion of a coating film. By attaching and evaluating the portable coating film moisture resistance tester, it is possible to reduce the inconvenience and unnecessary time required for painting and testing standard specimens, and to evaluate the moisture resistance of the coating film from a practical point of view. Stability, evaluation technology and the like can be achieved.

Actual car, Painting, Coating, Moisture resistance, Durability, Portable, Heated wire, Pyrex, Magnet, O-ring, Temperature control switch, Salt water

Description

Portable measuring device for moisture-resistance property of automotive paint

1 is a perspective view showing the configuration of a portable coating film moisture resistance tester for a vehicle according to the present invention;

FIG. 2 is a cross-sectional view showing a shape in which FIG. 1 is attached to a measurement portion of a real vehicle;

3 is a flowchart illustrating a process of evaluating moisture resistance of a vehicle body coating film using FIG. 1.

<Description of the symbols for the main parts of the drawings>

10: main body 11: hot wire

12: magnet 13, 23: O-ring

14: temperature control switch 20: stopper

The present invention relates to a portable coating film moisture resistance tester of a vehicle, and more specifically, to form a coating film on a standard specimen in a laboratory, and to be mounted directly on a part of a vehicle actually running away from the test method of evaluating moisture resistance. The present invention relates to a portable coating film moisture resistance tester for automobiles for evaluating the moisture resistance of an actual vehicle coating film.

In particular, in the portable coating film of the automobile of the present invention, the parts are directly related to the impact resistance caused by chipping caused by chipping in the driving environment of the vehicle and the rust-preventing weakness that has been caused by quality problems due to deterioration of the anti-corrosion property due to the decrease in the moisture resistance of the coating film or the adhesion of the coating film. By attaching and evaluating the wet tester, it is possible to reduce the inconvenience and unnecessary time required for painting and testing standard specimens, and to evaluate the moisture resistance of the coating from a practical point of view. And the like can be achieved.

In general, a coating process is performed on the exterior surfaces of automobile exterior parts (steel plate, plastic material, etc.) and various parts, and the coating process is a process of forming an electrodeposition layer by electrodeposition on a steel plate for automobile exterior plate and the electrodeposition layer. Forming a top coat layer by forming a middle coat on the surface of the top coat, coating a top coat as a color base on the surface of the middle coat layer, and applying a transparent coating to the surface after setting the top coat layer. And the like to form a coating layer.

In such a coating process, the adhesion of the coating film may be an important criterion for determining the quality of the coating. The adhesion of the coating film (adhesiveness) refers to a property in which the coating film and the surface below are tightly attached and do not fall off well.

In order to improve the adhesiveness of such a coating film, a primer is processed and a middle and top coat process is performed.

The portable coating film moisture resistance tester of the automobile of the present invention is a necessary equipment for developing the coating and evaluating the durability of the vehicle coating film, but at present, the moisture resistance test is carried out using a small standard specimen.

In general, the coating film painted on the vehicle body surface of the vehicle has a function of making the design stand out, increasing the merchandise value and protecting the vehicle body. When the service life of the vehicle is gradually longer or the paint applied to the car body is damaged due to careless holes (chipping and scratching) and the car body is corroded, the appearance quality of the car is sharply degraded, so it is important to secure the durability of the paint.

The durability of the coating film of the vehicle body is directly related to preventing deterioration by reaction with water and oxygen, which are external environments. Therefore, the durability of the coating film is related to moisture resistance, so evaluation thereof is important.

Here, the method of testing the moisture resistance of the existing vehicle coating film is as follows.

First, a coating film is formed on the surface of the steel plate which forms a vehicle body. In general, the coating layer is an electrodeposition layer applied to the surface of the steel sheet, a middle coating film applied to the surface of the electrodeposition layer, a topcoat layer obtained by coating a topcoat paint as a color base on the surface of the intermediate coating film, and the topcoat paint It is divided into a clear coating (CLEAR) coated on the layer. Part of the coating thus formed completes the standard test specimen.

Usually, when evaluating standard specimens, the high temperature and high humidity environment is maintained and the degree of swelling of the coating film is evaluated. The evaluation takes about 5 days to a week and evaluates moisture resistance and durability.

Conventionally, it is widely known to evaluate the moisture resistance of the coating film itself in a real single product state, but since it is a commercialized equipment that evaluates only a single product in a limited place, the moisture resistance when the coating film of the vehicle is deteriorated due to external environmental influences is known. There is a serious problem that cannot be easily assessed.

It is very important to evaluate the coating film of the actual vehicle because it is difficult to form the coating film on the actual coating process line in the actual vehicle state rather than forming and using the coating film on a standard specimen in a single state.

In addition, it is very important to evaluate the moisture resistance of the coating film at the actual vehicle corrosion durability stage, which simulates a variety of complex vehicle environments in the vehicle development stage.

Therefore, at present, there is almost no technology for evaluating the moisture resistance of the coating film itself caused by the actual vehicle exposure to the external environment, and a moisture resistance tester which evaluates the moisture resistance with the coating film formed in the actual coating process line and exposed to the external environment is present. need.

The present invention has been invented to solve the above problems, not to form a coating on the standard specimen and to test the moisture resistance, the actual vehicle exposed to the external environment is lowered in the rust resistance due to moisture resistance or adhesion lowered quality problems The purpose of the present invention is to provide a portable coating film moisture resistance tester of a vehicle that can be directly attached to the coating film of the site to evaluate moisture resistance and durability.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention to achieve the above object is a cylindrical body; A heating wire wound around the main body in a spiral direction; A magnet attached to an outer side of a lower end of the main body to fix and fix the main body to a measurement part; An o-ring attached to a lower surface of the main body so that no leakage occurs between the main body and the measurement part; A temperature control switch connected to the heating wire to adjust the temperature; A top plate formed of a predetermined outer diameter to cover the main body, and a lower plate having a jaw formed at the upper plate and having an outer diameter closely attached to the inner diameter of the main body; The present invention provides a portable coating film moisture resistance tester for an automobile that evaluates moisture resistance of the coating film formed on a vehicle.

In addition, the stopper is characterized in that the body is covered and sealed so that the O-ring is attached around the lower plate to prevent the brine from leaking to the outside.

In addition, the main body is made of a transparent heat-resistant glass, withstands the temperature change of the hot wire, it is characterized in that the change of the coating film occurring inside the main body can be observed with the naked eye.

In this way, the bottom surface of the main body is attached to the flat part of the vehicle, and maintained at 90 degrees with respect to the attachment site, but closely attached so as not to shake from side to side to evaluate the moisture resistance of the coating film of the measurement site.

Thus, the portable coating film moisture resistance tester of the vehicle of the present invention can measure the moisture resistance of the coating film of the vehicle generated by exposure to the external environment regardless of the position.

As a result, it is possible to secure a reliable evaluation technology for the moisture resistance of the coating film in the actual external environment, and to form a coating film with more durability, thereby preventing the coating film from deteriorating in the field region.

There may be a plurality of embodiments of the present invention, the following will be described in detail with respect to a preferred embodiment.

Through this preferred embodiment, it is possible to better understand the objects, features and advantages of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing the configuration of a portable coating film moisture resistance tester of a vehicle according to the present invention, Figure 2 is a cross-sectional view showing the shape of Figure 1 attached to the measurement portion of the actual vehicle, Figure 3 uses Figure 1 Is a flowchart illustrating a process of evaluating moisture resistance of the vehicle body coating film.

The present invention is composed of a main body 10 attached to the measurement portion of the vehicle, and the stopper 20 so that the salt is filled in the main body 10 for the test so as not to overflow the outside of the main body 10.

The main body 10 has a cylindrical shape, and in the present embodiment, is formed with an outer diameter of 70 mm, a height of 150 mm, and a thickness of 10 mm.

In order to adjust the temperature of the brine inside the main body 10, the heating wire 11 that can adjust the temperature up to 60 ℃ is wound in a spiral direction is built.

At this time, in order to be less affected by the temperature of the heating wire 11, the main body 10 uses a heat-resistant glass that withstands temperature change well.

The heat resistant glass is a glass that withstands rapid heat and quenching, that is, has a low coefficient of thermal expansion and withstands sudden changes in temperature, and a softening temperature is higher than that of ordinary glass. It means glass (about 1,000 ℃). Types include quartz glass, Vycor and Pyrex.

Since the Pyrex has a coefficient of thermal expansion of 1/2 to 1/4 of ordinary glass, it can be used as a member of the main body 10 so that the temperature of the heating wire 11 can be raised to 60 ° C.

Therefore, the main body 10 is made of a Pyrex glass barrel, and through the transparent Pyrex glass vessel, it is possible to observe the change of the coating film occurring therein in real time with the naked eye.

An O-ring 13 for watertightness is attached to the lower end surface of the main body 10 so as to be in close contact with the measurement part of the vehicle. Accordingly, even though the salt water is filled in the main body 10, the salt water is sealed without leaking to the outside of the main body.

Then, a magnet 12 for fixing the main body 10 to the measurement site is formed on the outer side of the lower end of the main body 10. The magnet 12 is formed in a round ring shape along the outer circumference of the main body 10 to be closely attached to the main body 10 to fix the main body 10 to the measurement portion of the vehicle.

On the other hand, the heating wire 11 is connected to the temperature control switch 14 is configured outside the main body 10 to adjust the temperature. The temperature control switch 14 adjusts the temperature of the heating wire 11 to 60 ° C according to the temperature required in the moisture resistance evaluation of the measurement site, it is used as 12V or free-volt (free-volt).

In order to cover the upper end of the main body 10 configured as described above, a stopper 20 made of a top plate 21 having a predetermined outer diameter and a lower plate 22 having an outer diameter formed to be in close contact therewith when the upper plate 21 is formed to cover the main body 10. It is composed.

The top plate 21 of the stopper 20 has the same outer periphery as the outer diameter of the main body 10 and has a height of 15 mm, and the lower plate 22 is formed by forming a jaw from the top plate 21 of the stopper and Covering the stopper 20 on the main body 10 is configured to be in close contact with the inner surface of the main body 10.

In the present embodiment, the lower plate 22 of the stopper is formed to have a height of 10 mm, and the watertight O-ring 23 is attached to the circumference of the lower plate 22 to prevent the brine contained in the body from leaking to the outside.

In the present invention, the stopper 20 is made of Teflon having properties such as perfect chemical inertness and heat resistance, non-tackiness, excellent insulation stability, low coefficient of friction, and the like.

Hereinafter, a method of using a portable coating film moisture resistance tester for a vehicle according to the present invention configured as described above is as follows.

First, the body 10 of the present invention is attached by selecting a portion having a history of low moisture resistance due to low durability of the coating film in the existing vehicle.

Then, the magnet 12 provided in the lower portion of the main body 10 to fix the main body 10 to the measurement portion of the vehicle, the O-ring on the lower surface of the main body 10 between the measuring portion and the lower surface of the main body 10 To seal.

In this case, the main body 10 should be attached to a flat portion so as not to shake from side to side while maintaining an angle of 90 degrees. Since the main body is very small compared to the size of the vehicle, a portion having a fine curved surface is also considered as a flat surface. It is possible.

If the main body 10 is well attached to the measurement part of the vehicle so as not to shake, after preparing a 5% concentration of brine and filling the inside of the main body, the lid 20 to which the water-tight O-ring 23 is attached is covered. At this time, the brine is not removed until the end of the test.

On the other hand, since the temperature of the coating film is known to deteriorate in the liquid state is about 50 ℃, the temperature of the heating wire 11 is set to 50 ℃ using the temperature control switch 14 at the same time as the start of the test of the measurement site.

The measurement time is measured from 5 days to a week, and after repeating at least three times to improve the reliability of the moisture resistance test, the degree of swelling of the coating film is visually observed through the transparent body 10.

At this time, the swelling state or corrosion of the coating film is observed at a daily interval of 4 hours based on the day time.

Then, when the test is completed, the area of swelling relative to the measured area is calculated for the measured area to evaluate the moisture resistance of the coating film of the measured area.

As a result, the coating film durability of the measurement site can be verified, and the coating film moisture resistance evaluation of the actual vehicle can be efficiently performed. Thus, through the process of testing and evaluating the durability of the vehicle coating film, a better coating film can be formed and the durability of the vehicle steel sheet Can be improved.

While the invention has been shown and described with respect to certain preferred embodiments, the invention is not limited to these embodiments, and those of ordinary skill in the art claim the invention as claimed in the appended claims. It includes all embodiments of the various forms that can be carried out without departing from the spirit.

As described above, the portable coating film moisture resistance tester of the vehicle according to the present invention can substantially evaluate the moisture resistance of the painted steel sheet of the vehicle generated by the actual vehicle exposed to the external environment from a more realistic viewpoint, and the standard specimen This is because the test is possible after attaching to the area to be measured of the actual vehicle, which is portable.

In addition, through this it is possible to secure the evaluation technology for the moisture resistance of the vehicle coating film in a more practical external environment, it is possible to prevent the coating film degradation of the vehicle.

Claims (3)

A cylindrical body; A heating wire wound around the main body in a spiral direction; A magnet attached to an outer side of a lower end of the main body to fix and fix the main body to a measurement part; An o-ring attached to a lower surface of the main body so that no leakage occurs between the main body and the measurement part; A temperature control switch connected to the hot wire to adjust a temperature of the hot wire; A stopper composed of an upper plate having a predetermined outer diameter to cover the main body, and a lower plate having a jaw formed at the upper plate and having an outer diameter closely attached to the inner diameter of the main body; Including, the inside of the main body of the portable film coating moisture resistance tester to evaluate the moisture resistance of the coating film formed on the vehicle by adjusting the hot wire to a predetermined temperature. The method according to claim 1, The stopper is attached to the O-ring around the lower plate is a portable coating film moisture resistance tester for a vehicle is sealed so that the body is prevented from leaking to the outside. The method according to claim 1, The main body is made of a transparent heat-resistant glass, to withstand the temperature change of the heating wire, the portable coating film moisture resistance tester of a vehicle that can observe the change of the coating film occurring inside the main body.

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