KR101099898B1

KR101099898B1 - Apparatus for measuring cure of coating film including optical instrument and method for measuring cure of coating film using thereof

Info

Publication number: KR101099898B1
Application number: KR20100007627A
Authority: KR
Inventors: 양원석; 이창용; 홍승택
Original assignee: 현대제철 주식회사
Priority date: 2010-01-27
Filing date: 2010-01-27
Publication date: 2011-12-28
Also published as: KR20110087951A

Abstract

The present invention relates to an apparatus for measuring the degree of cure of a coating film including a photo-measuring part and a method for measuring the hardness of the coating film using the same, including a work table including a rail capable of reciprocating a specimen on which a coating film is formed, and a specimen formed on an upper portion of the rail. A fixed holder portion, a driving portion formed on one side of the work table to reciprocate the specimen fixing holder, positioned on an upper portion of the rail, and fixing a cotton cloth for friction with the surface of the specimen, and methylethyl on the cotton cloth A fixing jig part including a burette capable of injecting ketones (MEK), and a supporting frame part provided on the other side of the work table of the rail, and configured to vertically move the fixing jig part while applying frictional pressure to the fixing jig. And the amount of light reflected between the support frame part and the driving part and irradiated with light on the surface of the specimen. And relates to an invention that by including an optical measurement section for calculating a degree of curing of the coating film by using the amount of light the reflection with high accuracy, so that the degree of curing is determined in the reliable coating.

Description

Apparatus for measuring the degree of cure of a coating film including a photometric portion and a method for measuring the degree of cure of the coating film using the same

The present invention relates to an apparatus for measuring the degree of cure of a coating film including a photo-measuring part and a method for measuring the degree of cure of the coating film using the same, and more particularly, by measuring a wear test result using an organic solvent using a reflection light measuring device The present invention relates to a technique for measuring a high degree of curing degree.

After forming an organic coating film in steel plate manufacture, the abrasion tester using a coin is used as a method of measuring the hardening degree of a coating film. Such a wear tester weighs the jig fixing the coin, causes friction to occur while reciprocating the steel plate on which the coating film is formed at the bottom of the coin, and determines whether the glossiness loss of the coating due to the friction force is measured to measure the degree of curing of the coating film. have.

The present invention uses a wear tester using an organic solvent such as methyl ethyl ketone (MEK) in order to improve the reliability of the result of measuring the degree of curing, but a constant friction force may be generated by using an electric motor rather than weight. An object of the present invention is to provide a method for measuring the degree of cure of a coating film using reflected light measurement, in which a change in glossiness of the coating film due to abrasion damage is measured using a device capable of measuring light incidence and reflected light.

In addition, the present invention provides a solvent spray wear tester having an electronically driven jig and an organic solvent injection cylinder, the optical measuring device is provided, to provide a degree of curing degree of the coating film that can be objectively and easily measured to cure the coating film. Its purpose is to provide.

The apparatus for measuring the degree of cure of a coating film including an optical measuring part according to the present invention includes a work table including a rail for reciprocating a specimen on which a film is formed, a specimen fixing holder part formed on an upper portion of the rail, and formed on one side of the work table. A driving part for reciprocating the specimen fixing holder, a burette positioned on an upper portion of the rail, fixing a cotton cloth for friction with the surface of the specimen, and spraying methyl ethyl ketone (MEK) on the cotton cloth; And a support jig part provided on the other side of the work table of the rail, and between the support frame part and the support frame part and the driving part for applying frictional pressure to the fixing jig part and simultaneously moving the fixing jig part up and down. And after irradiating light to the surface of the specimen, the amount of light reflected is measured, and the degree of curing of the coating film using the amount of reflected light. It characterized in that it comprises a light measuring unit for calculating.

Here, the fixing jig portion further comprises a storage container and an injection cylinder for supplying the methyl ethyl ketone (MEK) to the burette, the support frame portion is an electronic motor capable of vertically moving the fixing jig portion, And a frame for supporting the motor and the fixed arm and a fixed arm capable of applying a force of the motor to the fixed jig portion.

Next, the photo-measuring unit measures the degree of curing of the coating film using the light output unit for irradiating light to the surface of the specimen, the light receiving unit for measuring the amount of light reflected from the surface of the specimen and the amount of light measured by the light receiving unit. It includes a calculation unit for calculating.

Next, the work table further comprises a logger for recording the calculation result of the photometer, the workbench further comprises a display unit for outputting the calculation result of the photometer, the worktable The control unit may further include a control unit for controlling movement of the driving unit, the fixing jig unit, and the support frame unit, and the work table may input work signals of the driving unit, the fixing jig unit, and the support frame unit. Characterized in that it further comprises a set value input unit.

In addition, the method for measuring the degree of cure of the coating film according to the present invention comprises the steps of loading the specimen on which the coating film is formed on a rail capable of reciprocating movement, and positioning a fixed jig including a cotton cloth absorbed by methyl ethyl ketone (MEK) on the upper rail And rubbing the surface to the face cloth with the specimen reciprocated along the rail while applying an electronic pressure to the fixing jig, and irradiating light onto the surface of the specimen from one side of the rail and then reflecting it. Measuring the amount of light to be used and calculating the degree of curing of the coating film using the amount of reflected light.

Here, the methyl ethyl ketone (MEK) is to be sprayed on the cotton cloth uniformly at regular time intervals by the automatic burette, the electronic pressure is to reciprocate the fixing jig up and down according to the input pressure load value It is characterized by being applied by a motor capable of, and the light irradiated to the specimen is characterized in using a hydrogen-helium laser.

Apparatus for measuring the degree of cure of the coating film including the photo-measuring portion according to the present invention and a method for measuring the degree of cure of the coating film using the same, without using a conventional passive wear resistance, applying an electronic pressure, using a photo-measuring portion friction part By monitoring the glossiness of the film in real time, it provides the effect of improving the accuracy and reliability of the degree of curing of the coating film.

In particular, the degree of curing degree measurement of the coating film according to the present invention can save the degree of curing degree measurement by using a photometer, and can improve the reliability of the coating film forming process by reducing the measurement error.

Therefore, the use of the method for measuring the degree of cure according to the present invention provides an effect of improving the yield of the coating film manufacturing process and reducing the manufacturing cost.

1 is a schematic view showing a device for measuring the degree of cure of the coating film according to the present invention.
2 is a schematic view showing a method for measuring the degree of cure of the coating film according to the present invention.
3a and 3b is a cross-sectional view and a plan view showing a method for measuring the degree of cure of the coating film according to the present invention.
4a and 4b is a cross-sectional view and a planar photograph showing a method for measuring the degree of cure of the coating film according to the present invention.

The coating film described in the present invention means an organic coating film formed on a steel sheet, and means a coating film having a predetermined degree of curing through a polymer crosslinking bonding process. In this case, the coating film may also include a case formed using the powder coating material, the substrate on which the coating film is formed is not always limited to the steel sheet. Therefore, the apparatus and method for measuring the degree of cure according to the present invention can be applied to all embodiments capable of measuring the degree of cure by abrasion test.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and those skilled in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, an apparatus for measuring the degree of cure of a coating film including a photometer according to a preferred embodiment of the present invention and a method for measuring the degree of cure of the coating film using the same will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the hardening degree measuring apparatus of the coating film which concerns on this invention.

Referring to the curing degree measuring device according to the present invention with reference to Figure 1, the workbench 100 is first provided as a main body portion of the measuring device, the rail 130 capable of reciprocating the specimen 145 having a coating film formed on the workbench Is provided. At this time, the rail 130 is preferably formed to be two to three times longer than the longitudinal size of the specimen 145. When the length of the rail 130 is shortened to less than twice, the space in which the photometer 170 or the driving unit 180 to be described later may be reduced, and the length of the rail 130 may be reduced by the specimen 145. If the length is longer than 3 times, the reciprocating distance of the specimen 145 may be increased, resulting in inefficiency.

Next, a specimen fixing holder 140 is provided on the rail 130 to fix the specimen 145 and to smoothly perform the reciprocating motion of the specimen 145. In this case, the specimen fixing holder 140 may be reciprocated by a roller method, together with the driving unit 180 provided at one edge of the rail 130, and various reciprocating motions such as a chain, a belt, or a gear method. Schemes may be used and the invention is not limited by such reciprocating means.

Next, the other edge portion, which is the opposite side of the rail 130 on which the driving unit 180 is formed, is provided with devices capable of providing a friction force to the specimen 145. First, a fixing jig unit 150 capable of fixing the surface cloth 156 which is in direct contact with the specimen 145 is provided. In this case, the fixing jig unit 150 may automatically spray organic solvents such as methyl ethyl ketone (MEK) to the fixing jig 158 holding the cotton cloth 156 and the cotton cloth 156 at regular intervals and in a uniform amount. An automatic burette 154 is included. In addition, a solvent storage container 152 and a solvent injection cylinder (not shown) may be formed on the burette 154 and the fixing jig 158 to continuously supply the solvent to the burette 154. In the conventional case, since the weight was to be provided at the position where the solvent storage container 152 is provided, it was difficult to manufacture the fixing jig unit 150 including the burette 154 in one body, but in the present invention, the electronic motor 162 is provided. Since it is possible to apply friction pressure uniformly, it is not necessary to add weight, and it is possible to apply a wear tester structure that can improve efficiency while simplifying the structure.

Next, the support frame unit 160 is provided to support the fixing jig unit 150 as described above, and the support frame unit 160 has the specimen jig 145 having the fixed jig unit 150 having a predetermined pressure. Electronic motor 162 to be in contact with, a fixed arm 166 to transmit the force of the motor to the fixing jig 158 and to maintain a fixed state, the motor 162 and the fixed arm 166 It is provided with a structure including a frame 164 for supporting the.

Next, as a main component according to the present invention, a light measuring unit 170 is provided between the fixing jig unit 150 and the driving unit 180 having the above structure. As such, since the photometer 170 is directly formed on the rail 130 reciprocating the specimen 145, the wear state of the specimen 145 can be continuously monitored. It can be shortened. In this case, the photometer 170 uses a method of determining the glossiness of the specimen 145 by measuring the reflected light, and continuously monitoring the discriminated state and quickly displaying the resultant value. ) And increase its efficiency. Curing degree measuring apparatus of the coating film according to the present invention, but the display unit 120 is included in the working table 100 as an embodiment, but is not always limited thereto. In addition, the worktable 100 according to the present invention may include not only an image output of the display 120, but also a logger and an interface capable of data printing, and may further include a USB terminal for storing data.

In addition, the work table 100 according to the present invention is a set value input unit 110 for inputting the operation of the electric motor 162, the automatic burette 154 and the like and the reciprocating signal of the specimen fixing holder 140, It may be further included, it may also include a control unit for transmitting the signal.

In the apparatus for measuring the degree of cure of the coating film according to the present invention as described above, a key part is the photometer 170, and the method for measuring the degree of cure using the same will be described below.

2 is a schematic view showing a method for measuring the degree of cure of the coating film according to the present invention.

2, while the specimen 145 reciprocates, the cotton cloth 156 is continuously sprayed with an organic solvent such as methyl ethyl ketone (MEK) through the burette 154. At this time, the solvent is preferably sprayed directly on the cotton cloth 156, but even if the sprayed to the surface of the specimen 145, the coating film according to the present invention does not significantly affect the measurement results. Therefore, the present invention is not limited by the solvent injection position, but it is preferable to maintain a manner in which a uniform amount is automatically sprayed at regular intervals during the reciprocating process.

Here, the reason for using the cotton cloth 156 is to provide a uniform wear area. Conventionally, there was a problem in that a non-uniform wear area appeared by directly contacting coins, and in the present invention, such a problem was solved by using a cotton cloth 156, and wear was further increased by using a solvent such as methyl ethyl ketone (MEK). The method which makes it easy and shortens abrasion time uses the effect which can acquire the effect which also shortens hardening degree and measurement time.

Next, the method for measuring the degree of cure of the coating film according to the present invention uses a method of determining the degree of gloss by measuring the amount of light reflected after irradiating light on the surface of the specimen 145 is abrasion occurs, and using this method to calculate the degree of cure do. Therefore, by providing the photometer 170 on the path of the specimen 145 reciprocating motion, the degree of curing of the coating film formed on the specimen 145 can be monitored in real time.

In this case, the light measuring unit 170 includes a light output unit 172 for irradiating light to the surface of the specimen 145 at a predetermined angle, a light receiving unit 174 for measuring the amount of light reflected from the surface of the specimen 145, and light water. What consists of the calculating part 176 which calculates the hardening degree of a coating film using the quantity of light measured by the bride 174 is used. In addition, the operation unit 176 may be connected to the above-described monitoring unit or logger.

In addition, the light output unit 172, by using a hydrogen-helium laser, it is preferable to be able to continuously provide a constant amount of light.

In the case of using the device including the photo-measuring unit as described above, faster and more accurate measurement is possible than visual observation. Hereinafter, the process of measuring the degree of curing using the reflected light by the light output unit has been described.

3A and 3B are cross-sectional views and planar photographs showing a method for measuring the degree of curing of a coating film according to the present invention.

Referring to FIG. 3A, it can be seen that the organic coating film 145b is formed on the steel plate 140a. The specimen 145 was formed according to a coating test method using a general paint paint, and there are significant differences in coating thickness and glossiness depending on the case of the coating process, so that specific coating conditions are omitted.

However, in all cases, the initial surface state of the coating film is the same, and since the initial coating state of the coating film 145b is all flat, the incident angle θ ₁ and the reflection angle θ ₂ are the same, and thus the amount of light is constant. It maintains good glossiness.

3B shows the coating film in the initial state as described above. In this case, the difference between the visual identification and the light measurement result value does not appear much. However, there is a difference between the visual inspection and the optical measurement while the wear test is performed with a cotton cloth using a solvent such as methyl ethyl ketone (MEK) according to the present invention.

4A and 4B are cross-sectional views and planar photographs showing a method for measuring the degree of curing of a coating film according to the present invention.

Referring to FIG. 4A, the damaged coating film 145c can be seen. In such a case, when the light measurement is performed, the reflection angle is scattered and the glossiness is significantly decreased. However, when the visual inspection method is used while the damaged coating film 145c does not expose the steel plate 145a and maintains a certain thickness, the identification becomes almost difficult.

The degree that can be identified by visual inspection should be completely peeled off as shown in FIG. 4B. In this case, since the wear test is performed several dozen more times from the measurement of the degree of curing by photometry, This increases the efficiency.

In addition, there may be a difference in the degree of curing depending on the curing process of the coating film, generally when the curing process for 20 minutes at 180 ℃, even if the wear test using the organic solvent as described above up to 100 ~ 200 times Deterioration of the degree hardly occurs. In this case, since it is impossible to identify by visual inspection, it is impossible to detect a fine defect in the curing process.

Table 1 below shows the glossiness measured during the abrasion test using methyl ethyl ketone (MEK) according to the present invention after the actual coating film formation. In Example 1, the sample was subjected to the curing process at 140 ° C. for 20 minutes. In the case of Example 2, the sample was subjected to the curing process for 20 minutes at 160 ℃ was used, in the case of Example 3 is the result measured using the sample undergoing the curing process for 20 minutes at 180 ℃. .

The glossiness of each sample was described by the average value shown by repeated experiments of 10 samples of the same type, and the measurement of the degree of curing was performed at the portion where the value of 80 ~ 90% in the initial glossiness appears.

Next, as a comparative example according to the present invention, the result of performing 60 degree gloss assuming 100% of the initial state in the visual inspection, and in the case of optical measurement by setting the 60 degree gloss using a gloss meter of BYK One result.

[Table 1]

In Example 1, since the degree of curing was not high, a noticeable decrease in glossiness was observed in five round trips. In this case, the error between the photometric and visual inspection results was not large. When it was performed, the hardness test time appeared only in 10 round trips, whereas the visual inspection showed hard time test time in 20 times, indicating that more than 10 round trips were required. In addition, it can be seen that the visual inspection, which is a comparative example in Example 3, is almost impossible to identify, and thus the curing time cannot be obtained. Therefore, when using the degree of inspection of the degree of curing of the coating film including the photo-measurement portion according to the present invention, it is possible to advance the time of the inspection, it is possible to examine the hardening difficult to visually identify, it is also possible to easily predict the change in the fine curing.

As described above, in general, the measuring method of visually observing and evaluating the glossiness in a state where the specimen is reciprocated for a certain number of times is very subjective, and the evaluation conditions are different for each evaluator, so that the accuracy is inferior. In particular, a difference may occur in the pressure applied to the coating due to the vibration of the weight. In addition, depending on the state of the material that provides a frictional force, such as coins, the degree of curing may be different.

Therefore, the apparatus for measuring the degree of cure of the coating film including the photo-measurement portion according to the present invention and a method for measuring the degree of cure of the coating film using the same, by using the photo-measurement to monitor the gloss of the friction portion in real time, It provides the effect of improving the accuracy and reliability for the measurement of the degree of cure. Therefore, hardening degree measurement time can be saved and the reliability of a coating-film formation process can be improved by reducing a measurement error.

Although the above has been described with reference to one embodiment of the present invention, various changes and modifications can be made at the level of those skilled in the art. Such changes and modifications may belong to the present invention without departing from the scope of the present invention. Therefore, the scope of the present invention will be determined by the claims described below.

100: workbench 110: set value input unit
120: display unit 130: rail
140: specimen fixing holder 145: specimen
145a: steel sheet 145b: coating film
145c: damaged coating
150: fixing jig portion 152: solvent storage container
154: automatic burette 156: cotton cloth
158: fixing jig 160: support frame portion
162: motor 164: frame
166: fixed arm 170: photo-measuring unit
172: light output unit 174: light receiving unit
176: calculator 180: driver

Claims

A work bench including a rail capable of reciprocating the specimen on which the coating film is formed;
A specimen fixing holder portion formed on an upper portion of the rail;
A driving part formed at one side of the worktable to reciprocate the specimen fixing holder;
A fixing jig disposed on an upper side of the rail and fixing a cotton cloth for friction with the specimen surface and including a burette for spraying methyl ethyl ketone (MEK) on the cotton cloth;
A support frame portion provided on the other side of the work table of the rail and configured to vertically move the fixing jig portion while applying frictional pressure to the fixing jig portion; And
It is formed between the support frame portion and the drive unit, and comprises a light measuring unit for measuring the amount of light reflected after irradiating light to the surface of the specimen, and calculates the degree of curing of the coating film using the reflected light amount Curing degree measuring apparatus of the coating film to make.

The method of claim 1,
The fixing jig unit further comprises a storage container and an injection cylinder for supplying the methyl ethyl ketone (MEK) to the burette, the degree of curing of the coating film.

The method of claim 1,
The support frame part may include an electronic motor capable of vertically moving the fixing jig part, a fixing arm capable of applying a force of the motor to the fixing jig part, and a frame capable of supporting the motor and the fixing arm. Curing degree measuring device of the coating film to be.

The method of claim 1,
The optical measuring unit calculates the degree of curing of the coating film using an optical output unit for irradiating light onto the surface of the specimen, an optical receiver for measuring the amount of light reflected from the surface of the specimen, and the amount of light measured by the optical receiver. Curing degree measuring device of the coating film comprising a.

The method of claim 1,
The work table further includes a logger for recording the calculation result of the photometer.

The method of claim 1,
The work table further includes a display unit for outputting a calculation result of the light measuring unit.

The method of claim 1,
The work table further includes a control unit for controlling the movement of the drive unit, the fixing jig unit and the support frame unit.

The method of claim 1,
The work table further includes a setting value input unit for inputting a work signal of the driving unit, the fixing jig unit, and the support frame unit.

Loading a specimen having a coating film on a rail capable of reciprocating;
Positioning a fixing jig including a cotton cloth absorbed with methyl ethyl ketone (MEK) on an upper portion of the rail;
Rubbing a surface against the face cloth with the specimen reciprocated along the rail while applying electronic pressure to the fixing jig;
Measuring the amount of light reflected after irradiating light onto the surface of the specimen from one side of the rail; And
And calculating the degree of cure of the coating using the amount of light reflected.

The method of claim 9,
The methyl ethyl ketone (MEK) is a method of measuring the degree of cure of the coating film, characterized in that to be sprayed uniformly at a predetermined time interval by the automatic burette.

The method of claim 9,
And said electronic pressure is applied by a motor capable of vertically reciprocating said fixing jig according to the input pressure load value.

The method of claim 9,
Method for measuring the degree of curing of the coating film, characterized in that the light irradiated to the specimen using a hydrogen-helium laser.