Coating test device, coating test method, coating test confirmation method

Abstract

To provide a coating film test device, a coating film test method capable of observing a process of contamination in evaluation of stain resistance of a coating film and easily performing relative comparison in a relatively short time.SOLUTION: With a coating film test device, two or more dogleg bending test plates having a coating film on a surface are arranged side by side in a state in which an upper portion thereof is inclined and a lower portion thereof is drooped. Above the upper portion of each of two or more test plates, a drop unit for dropping a contaminant containing liquid is installed. As the two or more test plates, at least a reference test plate provided with a reference coating film and a comparative test plate provided with a comparative coating film are available. A coating film test method uses the coating film test device and drops the contaminant containing liquid intermittently for a predetermined time at an upper portion of the two or more test plates.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a novel coating test device, a coating test method, and a coating test verification method. [Background technology]

[0002] Conventionally, outdoor exposure tests have been conducted to evaluate the stain resistance of coatings. However, outdoor exposure tests take several months to several years. Therefore, in order to evaluate the stain resistance of coatings in a relatively short time, accelerated tests using a contaminant-containing liquid have been conducted. Known examples of such accelerated test devices include one that pumps up a contaminant-containing liquid while rotating a test plate in a test tank, causes the contaminant-containing liquid to flow down onto the test plate, and then blows warm air into the test tank (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2-136734 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the above-mentioned devices, the test must be performed inside a test tank, and the test plate rotates, making it impossible to observe the process of contamination. Furthermore, to perform a comparative evaluation of two or more types of test plates, the test plate must be removed from the test tank after a certain period of testing, and the degree of contamination must be evaluated. If there is no difference, the test plate must be placed back into the test tank and the test must be performed again, which is a cumbersome operation.

[0005] The present invention has been made in view of the above-mentioned problems, and aims to provide a coating test device, a coating test method, and a coating test confirmation method that enable observation of the process of contamination in evaluating the contamination resistance of a coating and enable easy relative comparison in a relatively short time. [Means for solving the problem]

[0006] As a result of intensive research into solving the above-mentioned problems, the inventors came up with the idea of ​​a coating test device that arranges two or more specific test plates side by side and has a drip section for dripping a contaminant-containing liquid onto the top of each test plate, as well as a coating test method and a coating test confirmation method using the same, and have completed the present invention.

[0007] That is, the present invention has the following features. 1. A coating test method for evaluating the stain resistance of a coating, comprising: Two or more dog-shaped bending test plates with a coating on the surface are arranged side by side with their upper parts inclined and their lower parts drooping, A dripping unit for dripping a contaminant-containing liquid is installed above the upper part of each of the two or more test plates, A supply and receiving tank is installed below the two or more test plates, which can supply the contaminant-containing liquid to the dripping section and receive the contaminant-containing liquid after dripping; The supply receiving tank is connected to the dripping section via a pipe and a pump; The two or more test plates include at least a reference test plate having a reference coating and a comparative test plate having a comparative coating. Using a coating test device, A coating testing method characterized by intermittently dripping a contaminant-containing liquid onto the top of each of the two or more test plates for a predetermined period of time. 2. A method for verifying the stain resistance of a coating, comprising: Two or more dog-shaped bending test plates with a coating on the surface are arranged side by side with their upper parts inclined and their lower parts drooping, A dripping unit for dripping a contaminant-containing liquid is installed above the upper part of each of the two or more test plates, A supply and receiving tank is installed below the two or more test plates, which can supply the contaminant-containing liquid to the dripping section and receive the contaminant-containing liquid after dripping; The supply receiving tank is connected to the dripping section via a pipe and a pump; The two or more test plates include at least a reference test plate having a reference coating and a comparative test plate having a comparative coating. Using a coating test device, A step A of intermittently dropping a contaminant-containing liquid onto each of the two or more test plates for a predetermined period of time; Process B: recording the process A as a video; a step C of playing back and displaying the video recorded in the step B using at least one means selected from fast forward and frame forward; A coating test confirmation method characterized by carrying out the steps of: 3. A method for verifying the stain resistance of a coating, comprising: Using the following coating test equipment N, A step A of intermittently dropping a contaminant-containing liquid onto the top of each of two or more test plates for a predetermined period of time; Process B: recording the process A as a video; a step C of playing back and displaying the video recorded in the step B using one or more means selected from fast forward and frame forward; A coating test confirmation method characterized by carrying out the steps of: (Coating Testing Equipment N) A dogleg-shaped bending test plate with a coating on its surface is placed with its upper part inclined and its lower part hanging down, Above the top of the test plate, a dripping section for dripping the contaminant-containing liquid is installed. 、 A supply / receiving tank is installed below the test plate, which can supply the contaminant-containing liquid to the dripping section and receive the contaminant-containing liquid after dripping; The supply receiving tank is connected to the dripping section via a pipe and a pump. Coating testing equipment. [Effects of the Invention]

[0008] According to the present invention, in the evaluation of the stain resistance of a coating, a relative comparison can be easily made in a relatively short time while observing the staining process. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing an example of a coating testing device M of the present invention. [Figure 2] 1 is a schematic diagram showing an example of a coating testing device M of the present invention. [Figure 3] 1 is a schematic diagram showing an example of a coating testing device N of the present invention. [Explanation of symbols]

[0010] M: Coating test equipment M N: Coating test equipment N 1: Reference test plate 2: Comparison test board 3: Fixed plate 4: Supply receiving tank 5: Tube 6: Pump 10,20:Dripping part 11, 21: Upper part of test plate 12, 22: Lower part of test plate DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described.

[0012] (Coating Testing Equipment M) The coating test apparatus M of the present invention is an apparatus for evaluating the contamination resistance of a coating, and is characterized in that it comprises two or more dog-legged bent test plates each having a coating on its surface, arranged side by side with their upper portions inclined and their lower portions hanging down, and a dripping section for dripping a contaminant-containing liquid onto the upper portion of each of the two or more test plates, and the two or more test plates include at least a reference test plate having a reference coating and a comparative test plate having a comparative coating. A schematic diagram of the apparatus is shown in Figure 1.

[0013] In the present invention, a dogleg-shaped bending test plate with a coating on its surface is used as the test plate. When the test plate is set up, the upper part (the area above the bend) of the test plate is inclined, and the lower part (the area below the bend) of the test plate is drooping. By setting up the test plate in this manner, the contaminant-containing liquid dripped onto the upper part of the test plate flows down to the lower part of the test plate, and the contamination resistance can be evaluated by observing the lower part of the test plate. It is desirable to set up the test plate so that the contaminant-containing liquid dripped onto the upper part of the test plate and flows down to the lower end of the lower part of the test plate, and it is desirable to set up the test plate so that the lower part of the test plate is vertical.

[0014] The dogleg-shaped bending test plate can be obtained by bending a flat test plate into a dogleg shape. A metal plate such as an aluminum plate can be used as the test substrate constituting the test plate. The size of the test plate can preferably be 5 to 30 cm in width and 10 to 100 cm in length. The angle after bending (the internal angle of the dogleg shape) is preferably 110 to 160°, more preferably 120 to 150°. The ratio of the upper and lower portions of the test plate after bending can be set within a range of preferably 1:10 to 1:1, i.e., the length of the upper portion of the test plate: the length of the lower portion of the test plate. A primer or the like is applied to the surface of such a test substrate (the surface on the convex side of the dogleg shape) as needed, and then a coating material to be evaluated for stain resistance is applied to form a coating.

[0015] In the coating test apparatus M, at least two, or three or more, dogleg-shaped bending test plates are arranged side by side. In FIG. 1, a reference test plate 1 and a comparative test plate 2 are arranged side by side on the left and right of a fixed plate 3. The reference test plate 1 is a test plate having a reference coating on its surface, and the comparative test plate 2 is a test plate having a comparative coating on its surface. Of these, the reference coating is a coating of a coating material that serves as a standard for contamination resistance. On the other hand, the comparative coating is a coating of a coating material that is the target for comparison. In FIG. 1, the test plates are arranged with a gap between them, but they may also be arranged so that they are in contact with each other.

[0016] A dripping unit is installed above the upper part of each test plate. This dripping unit drips the contaminant-containing liquid onto the test plate (preferably the upper part of the test plate). The dripping unit is preferably installed so that the contaminant-containing liquid drips onto the upper part of the test plate and flows down to the lower end of the lower part of the test plate. The height of the dripping unit (the distance between the dripping unit and the upper part of the test plate) can be appropriately set taking into consideration factors such as preventing splashing of the dripped contaminant-containing liquid. In addition, a supply tank for supplying the contaminant-containing liquid can be connected to the dripping unit. In Figure 1, one dripping unit is installed per test plate, but it is also possible to install two or more dripping units per test plate.

[0017] The contaminant-containing liquid may be, for example, a dispersion of contaminants such as carbon black, natural loess, synthetic loess, tar, Kanto loam, silica powder, etc. in a medium such as water. The concentration of the contaminants in the contaminant-containing liquid can be set appropriately, for example, within the range of 0.0001 to 5% by weight.

[0018] A receiving tank can be installed below each test plate to receive the contaminant-containing liquid that has dripped down from the test plate. In the present invention, a tank that serves as both a supply tank and a receiving tank, i.e., a supply receiving tank that can supply the contaminant-containing liquid to the dripping section and receive the contaminant-containing liquid after dripping, can also be installed below each test plate. As shown in Figure 2, by connecting the supply receiving tank 4 to the dripping section via a pipe 5 and a pump 6, it becomes possible to circulate the contaminant-containing liquid. The supply receiving tank 4 can also be installed with equipment that has, for example, a stirring function, a dispersion function, etc. (a stirrer, an ultrasonic generator, etc.).

[0019] (Coating test method) The coating test method of the present invention is performed to evaluate the contamination resistance of a coating. In the present invention, using the above-mentioned coating test apparatus M, a contaminant-containing liquid is intermittently dripped onto the top of two or more test plates for a predetermined period of time (Step A). ​​According to this coating test method, in evaluating the contamination resistance of a coating, relative comparisons can be easily made in a relatively short time while observing the contamination process. In this case, it is sufficient to set the type of contaminant-containing liquid, dripping speed, test environment (temperature, humidity, etc.), etc. to the same conditions for each test plate.

[0020] In the coating testing method of the present invention, it is essential to intermittently drip the contaminant-containing liquid. This makes it easier to identify differences in the contamination state between the reference test plate and the comparative test plate. The mechanism of action is not limited to the following: by intermittently dripping the contaminant-containing liquid, the coating surface becomes wet when droplets of the contaminant-containing liquid pass through the coating surface, but after passing through, it transitions to a dry state. Repeated cycles of this wet and dry state are thought to promote the adhesion of contaminants to the coating, making it easier for differences in the contamination resistance of the coating to emerge. If the contaminant-containing liquid is continuously poured onto the coating surface, relative differences in the contamination resistance of the coating are less likely to emerge.

[0021] In the present invention, the contaminant-containing liquid can be dropped at a dropping speed of preferably 0.1 to 6 drops / second, more preferably 0.5 to 4 drops / second.

[0022] The dripping time of the contaminant-containing liquid can be set as appropriate, and can be used as a guideline for the time it takes for a difference in contamination resistance to appear between the reference test plate and the comparison test plate. When using an apparatus like the one shown in Figure 2, the contaminant-containing liquid can be circulated, allowing the test to be carried out efficiently until a difference in contamination resistance appears between the reference test plate and the comparison test plate.

[0023] In the present invention, the final evaluation of contamination resistance can be performed by observing the contamination state of each test plate after the dripping of the contaminant-containing liquid is completed. After the dripping of the contaminant-containing liquid is completed, if necessary, the plate can be washed with water, scrubbed with a sponge, or the like, and the contamination state after such treatment can be evaluated. The contamination state can be observed visually, and if necessary, can also be evaluated by color difference measurement, etc.

[0024] (Coating test confirmation method) In the present invention, the method for confirming the contamination resistance of a coating film is carried out using the above-mentioned coating film testing device M, A step A of intermittently dropping a contaminant-containing liquid onto the top of each of two or more test plates for a predetermined period of time; Process B: recording the process A as a video; a step C of playing back and displaying the video recorded in the step B using at least one means selected from fast forward and frame forward; According to this method, in the evaluation of the stain resistance of a coating, the person checking the evaluation results can easily make a relative comparison in a shorter time while observing the process of staining.

[0025] Of these, process A is as described above. Process B is a process of recording process A as a video. Process B is carried out simultaneously with process A, and involves recording as a video the state in which the contaminant-containing liquid dripped onto each test specimen flows. The video can be recorded using a device with a video recording function (such as a video camera) so that at least the state of the lower part of the test plate (the state of contamination by the contaminant-containing liquid) is recorded, and it can also be recorded so that the state of the lower part of the test plate, the upper part of the test plate, and the dripping part are recorded.

[0026] Step C is a step of playing back and displaying the video recorded in step B using at least one or more means selected from fast-forwarding and frame-by-frame playback (hereinafter simply referred to as "fast-forwarding, etc."). In this step, for example, a one-hour video can be shortened to a few tens of seconds to a few minutes and played back and displayed. In this case, the inspector can visually grasp the contamination process on the reference test plate and the comparative test plate, which is advantageous in terms of grasping differences between the two. It is also advantageous in terms of grasping slow or gradual changes that may be overlooked in normal observation. Note that while at least fast-forwarding, etc. is used in step C, means such as normal playback, pausing, slow playback, and rewinding can also be used in combination, as long as the effects of the present invention are not significantly impaired.

[0027] The video recorded in process B can be edited using at least fast-forwarding or other means. In this case, process C is executed when the inspector issues a playback display instruction (by pressing a play button, selecting, etc.) for the edited video, allowing the inspector to easily check the contamination status in a short amount of time.

[0028] The playback and display in step C can also be performed, for example, on a homepage on the Internet. As an example, the video recorded in step B can be edited using at least a means such as fast forwarding, and the edited video can be posted on a homepage or the like in a playable state. In this way, when a checker (a homepage visitor, etc.) gives an instruction to play and display (by pressing a play button, selecting, etc.), step C is executed, and the checker can easily check the state of contamination in a short time.

[0029] The inspector can make a final evaluation of the contamination resistance by observing the state after the contaminant-containing liquid has been dripped. If the contaminant-containing liquid has been dripped and then washed with water or scrubbed with a sponge or the like, the contamination status after such treatment can also be evaluated. Such treatments can also be recorded as video, played back, or displayed using means such as fast forwarding. The contamination status can be observed visually, and can also be evaluated by color difference measurement, etc., if necessary.

[0030] (Modification of coating test confirmation method) In the present invention, in order to confirm the contamination resistance of a coating, the following coating tester N can be used instead of the above coating tester M. Coating Testing Equipment N A dogleg-shaped bending test plate with a coating on its surface is placed with its upper part inclined and its lower part hanging down, A coating testing device having a dripping section for dripping a contaminant-containing liquid installed above the upper portion of the test plate.

[0031] The coating test apparatus N is equipped with one dogleg-shaped bending test plate. A schematic diagram of the apparatus is shown in Figure 3. The configuration of the coating test apparatus N is the same as that of the coating test apparatus M, except that only one test plate is installed. A supply tank, a receiving tank, a supply / receiving tank, pipes, a pump, etc. may also be installed.

[0032] When using the coating test device N, step A can be performed, for example, by the following method. (1) Prepare two or more coating test devices N and perform step A on two or more test plates, respectively. (2) Prepare one coating test device N and perform step A on two or more test plates.

[0033] In the above (1), two or more coating test devices N may be installed side by side or separately. The contaminant-containing liquid may be dropped simultaneously or at different times. In this case, it is desirable to set the same conditions for the type of contaminant-containing liquid, the dropping rate, the test environment (temperature, humidity, etc.), etc.

[0034] In the above (2), the contaminant-containing liquids may be dripped at different times. In this case, it is desirable to set the same conditions for the type of contaminant-containing liquid, drip rate, test environment (temperature, humidity, etc.), etc.

[0035] In both (1) and (2) above, in step B, each step A is recorded as a video. Then, in step C, the video recorded in step B is played back and displayed using at least one means selected from fast forward and frame forward. In this step C, it is desirable to edit the video so that videos of two or more test plates are played back and displayed simultaneously. Other than this, steps A to C can be performed in the same manner as in the case of the coating test apparatus M.

[0036] (How to use the present invention) The present invention is useful for screening and demonstrating coating materials for stain resistance, etc. It is also possible to perform a relative comparison of differences in staining conditions when two or more identical test plates are used with different types of stain-containing liquid, different drip rates, different test environments (temperature, humidity, etc.), etc.

Claims

1. 1. A coating test method for evaluating the stain resistance of a coating, comprising: Two or more dog-shaped bending test plates having a coating on the surface are arranged side by side with their upper portions inclined and their lower portions drooping, A dripping unit for dripping a contaminant-containing liquid is provided above each of the two or more test plates; A supply / receiving tank is installed below the two or more test plates, which can supply the contaminant-containing liquid to the dripping section and receive the contaminant-containing liquid after dripping; The supply receiving tank is connected to the dripping section via a pipe and a pump; a coating testing device having at least a reference test plate having a reference coating and a comparative test plate having a comparative coating as the two or more test plates; A coating testing method characterized by intermittently dropping a contaminant-containing liquid onto the top of each of the two or more test plates for a predetermined period of time.

2. A method for verifying the stain resistance of a coating, comprising: Two or more dog-shaped bending test plates having a coating on the surface are arranged side by side with their upper portions inclined and their lower portions drooping, A dripping unit for dripping a contaminant-containing liquid is provided above each of the two or more test plates; A supply / receiving tank is installed below the two or more test plates, which can supply the contaminant-containing liquid to the dripping section and receive the contaminant-containing liquid after dripping; The supply receiving tank is connected to the dripping section via a pipe and a pump; a coating testing device having at least a reference test plate having a reference coating and a comparative test plate having a comparative coating as the two or more test plates; A step A of intermittently dropping a contaminant-containing liquid onto each of the two or more test plates for a predetermined period of time; a step B of recording the step A as a video; a step C of playing back and displaying the moving image recorded in the step B using at least one means selected from fast forward and frame forward; A coating test confirmation method characterized by carrying out the steps of:

3. A method for verifying the stain resistance of a coating, comprising: Using the following coating test device N, A step A of intermittently dropping a contaminant-containing liquid onto the top of each of two or more test plates for a predetermined period of time; a step B of recording the step A as a video; a step C of playing back and displaying the moving image recorded in the step B using one or more means selected from fast forward and frame forward; A coating test confirmation method characterized by carrying out the steps of: (Coating Testing Device N) A dogleg-shaped bending test plate with a coating on its surface is placed with its upper part inclined and its lower part hanging down, A dripping unit for dripping a contaminant-containing liquid is installed above the upper portion of the test plate, A supply / receiving tank is installed below the test plate, which can supply the contaminant-containing liquid to the dripping section and receive the contaminant-containing liquid after dripping; The supply / receiving tank is connected to the dripping section via a pipe and a pump in the coating testing device.

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