Coating film evaluation jig and coating film evaluation method

Abstract

To provide a coating film evaluation jig for evaluating the long-term crack-following ability of a coating film. [Solution] The coating evaluation jig includes a test specimen fixing part that adheres to a test specimen on which a coating film is provided on its upper surface and fixes the test specimen to a support base, a load generating part connected to the test specimen fixing part and generating a tensile load to be applied to the test specimen, and a width measuring part for measuring the width of a slit directly or indirectly formed in the test specimen. The test specimen fixing part includes a first adhesive fixing part connected to the load generating part and having a first adhesive surface that adheres to the side surface of a first part of the test specimen, and a second adhesive fixing part having a gap with the first adhesive fixing part and having a second adhesive surface that adheres to the side surface of a second part of the test specimen, and a slit may be formed between the first part and the second part.

Description

Technical Field

[0001] One embodiment of the present invention relates to a coating film evaluation jig for evaluating the long-term crack followability of a coating film. Another embodiment of the present invention relates to a coating film evaluation method using the above coating film evaluation jig.

Background Art

[0002] In buildings, it is often the case that a coating material such as a finish coating material or a waterproofing material is applied onto a base material such as concrete to form a coating film. As general evaluation tests for coating films, a dumbbell test and a zero-span tension test are known. The zero-span tension test is a test for evaluating crack followability, which is one of the performances of a coating film. Crack followability is a performance indicating the extent to which a coating film can follow cracks when cracks occur in the base material. An evaluation method for such crack followability of a coating film is disclosed in, for example, Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In actual buildings, since temperature shrinkage and drying shrinkage of concrete can occur, there is often a demand for long-term crack followability rather than short-term crack followability. In Patent Document 1, the crack followability of a coating film is evaluated based on the single-film data of the coating film and the results of the zero-span tension test. However, in the case of long-term crack followability, there is a tendency to show greater crack followability than in the zero-span tension test, and there is a possibility that long-term crack followability cannot be evaluated. In particular, for a coating film using a synthetic resin-based coating material, whether the zero-span tension test is appropriate is also an issue.

[0005] One embodiment of the present invention aims to provide a coating evaluation jig for evaluating the long-term crack-following ability of a coating film. [Means for solving the problem]

[0006] A coating film evaluation jig according to one embodiment of the present invention includes a test specimen fixing part that adheres to a test specimen having a coating film on its upper surface and fixes the test specimen to a support base, a load generating part connected to the test specimen fixing part and generating a tensile load to be applied to the test specimen, and a width measuring part that measures the width of a slit directly or indirectly formed in the test specimen.

[0007] The specimen fixing portion includes a first adhesive fixing portion connected to the load generating portion and having a first adhesive surface that adheres to the side surface of the first portion of the specimen, and a second adhesive fixing portion having a gap with the first adhesive fixing portion and having a second adhesive surface that adheres to the side surface of the second portion of the specimen, and a slit may be formed between the first portion and the second portion.

[0008] The specimen fixing portion may further include a first bottom plate having an adhesive surface that adheres to the bottom surface of the first portion of the specimen, located below the first adhesive fixing portion, and a second bottom plate having an adhesive surface that adheres to the bottom surface of the second portion of the specimen, located below the second adhesive fixing portion.

[0009] A friction-reducing sheet may be provided beneath the first and second bottom plates.

[0010] The width of the slit may correspond to the distance between the two small pieces attached to the test specimen between the first adhesive fixing portion and the second adhesive fixing portion.

[0011] The load generating section includes a load cell connected to a test specimen fixing section, and a load adjusting section connected to the load cell for adjusting the tensile load. The load adjusting section may include an elastic member.

[0012] The load cell is connected to the load adjustment unit via a bracing plate fixed to the support base, and the elastic member may be provided on the opposite side of the load cell from the bracing plate.

[0013] The load adjustment section further includes a nut for adjusting the magnitude of the tensile load and a threaded rod having a threaded portion that screws into the nut, the threaded rod having an axial direction parallel to the direction of connection between the load cell and the test specimen fixing section.

[0014] A coating film evaluation method according to one embodiment of the present invention involves applying a coating material to the upper surface of a test specimen, which has slits extending from the bottom surface to the top surface so as not to separate the top surface, forming a coating film; adhering the first bottom plate and the second bottom plate of a coating film evaluation jig to the bottom surfaces of the front and rear portions of the test specimen, which are separated by the slits; adhering the first fixing bracket and the second fixing bracket of the coating film evaluation jig to the sides of the front and rear portions, respectively; bending the test specimen to form cracks in the test specimen starting from the slits; fixing the first fixing bracket, the second fixing bracket, the first bottom plate, and the second bottom plate to a support; connecting the load generating part of the coating film evaluation jig to the first fixing bracket; and generating a load at the load generating part so as to apply a tensile load to the test specimen.

[0015] The load generating section includes a load cell, and the tensile load may be adjusted by the force pulling the load cell.

[0016] The load-generating section includes a weight, and the tensile load may be adjusted by the weight of the weight.

[0017] The floor coating material may be a synthetic resin-based floor coating material. [Effects of the Invention]

[0018] By using a coating film evaluation jig according to one embodiment of the present invention, the long-term crack-following ability of a coating film can be evaluated. [Brief explanation of the drawing]

[0019] [Figure 1]It is a schematic side view showing the configuration of a coating film evaluation jig according to an embodiment of the present invention. [Figure 2] It is a schematic plan view showing the configuration of a coating film evaluation jig according to an embodiment of the present invention. [Figure 3] It is a schematic perspective view showing the configuration of a test body used in a coating film evaluation jig according to an embodiment of the present invention. [Figure 4] It is a schematic side view showing the configuration of a width measurement part of a coating film evaluation jig according to an embodiment of the present invention. [Figure 5] It is a schematic plan view showing the configuration of a width measurement part of a coating film evaluation jig according to an embodiment of the present invention. [Figure 6] It is a schematic side view showing the configuration of a test body fixing part of a coating film evaluation jig according to an embodiment of the present invention. [Figure 7] It is a schematic side view showing the configuration of a coating film evaluation jig according to an embodiment of the present invention. [Figure 8] It is a schematic plan view showing the configuration of a coating film evaluation jig according to an embodiment of the present invention.

Mode for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments are merely examples, and those that can be easily conceived by those skilled in the art by appropriately changing while maintaining the gist of the invention are naturally included in the scope of the present invention. Also, in the drawings, for the sake of clearer explanation, the width, thickness, or shape of each part may be schematically represented compared to the actual aspect. However, the illustrated shapes and the like are merely examples and do not limit the interpretation of the present invention.

[0021] In this specification and the drawings, the same or similar components are denoted by the same reference numerals. However, when the components are distinguished, they may be denoted by adding a capital letter of the alphabet to the reference numeral. Also, when one component is distinguished into a plurality of parts, the plurality of parts may be denoted using a hyphen and a natural number.

[0022] <First Embodiment> Referring to Figures 1 to 3, a coating film evaluation jig 10 according to one embodiment of the present invention will be described.

[0023] Figure 1 is a schematic side view showing the configuration of a coating film evaluation jig 10 according to one embodiment of the present invention. Figure 2 is a schematic top view showing the configuration of a coating film evaluation jig 10 according to one embodiment of the present invention. Figure 3 is a schematic perspective view showing the configuration of a test specimen 1000 used in a coating film evaluation jig according to one embodiment of the present invention.

[0024] The coating evaluation jig 10 is a jig for evaluating the long-term crack-following ability of a coating 1100 formed on a test specimen 1000. The coating evaluation jig 10 is used by fixing the test specimen 1000 to a support base 2000. As shown in Figures 1 and 2, the coating evaluation jig 10 includes a test specimen fixing part 100, a load generating part 200, and a width measuring part 300. The test specimen fixing part 100 and the load generating part 200 are arranged along the x-direction. Here, the x-direction and y-direction are parallel to the surface of the support base 2000, for example, parallel to the floor surface. In this case, the z-direction corresponds to the direction perpendicular to the floor surface. The configurations of the test specimen fixing part 100, the load generating part 200, and the width measuring part 300 of the coating evaluation jig 10 will be described in detail below.

[0025] [1. Configuration of the test specimen fixing part 100] The specimen fixing section 100 can fix the specimen 1000 to the coating evaluation jig 10 and fix the coating evaluation jig 10 to the support base 2000. The specimen fixing section 100 includes a pair of first fixing brackets 110, a pair of second fixing brackets 120, a first bottom plate 130, a second bottom plate 140, a connecting plate 150, a connecting rod 160, and a sway-preventing plate 170.

[0026] The test specimen 1000 can be fixed using a pair of first fixing brackets 110, a pair of second fixing brackets 120, a first bottom plate 130, and a second bottom plate 140. The pair of first fixing brackets 110 are arranged symmetrically in the y-direction so that a part of the test specimen 1000 (hereinafter, for the sake of explanation, referred to as the "front part of the test specimen 1000") can be sandwiched between them. The pair of second fixing brackets 120 are arranged symmetrically in the y-direction so that another part of the test specimen 1000 (hereinafter, for the sake of explanation, referred to as the "rear part of the test specimen 1000") can be sandwiched between them. That is, the pair of first fixing brackets 110 and the pair of second fixing brackets 120 are arranged in the x-direction. Furthermore, the test specimen 1000 is divided into a front part and a rear part, and the direction from the rear part toward the front part (or from the front part toward the rear part) corresponds to the x-direction. The first base plate 130 is positioned below the pair of first fixing brackets 110 so as to support the front portion of the test specimen 1000. Each of the pair of first fixing brackets 110 and the first base plate 130 has a screw hole, and the pair of first fixing brackets 110 can be fixed to the first base plate 130 by passing screws through the screw holes. The second base plate 140 is positioned below the pair of second fixing brackets 120 so as to support the rear portion of the test specimen 1000. Each of the pair of second fixing brackets 120 and the second base plate 140 has a screw hole, and the pair of second fixing brackets 120 can be fixed to the second base plate 140 by passing screws through the screw holes. The screws used to fix the pair of second fixing brackets 120 and the second base plate 140 can be screwed into screw holes provided in the support base 2000. This allows the pair of second fixing brackets 120 and the second base plate 140 to be fixed to the support base 2000.

[0027] The test specimen 1000 is fixed to the test specimen fixing part 100 by adhesive. Each of the first fixing bracket 110 and the second fixing bracket 120 has a flat adhesive surface that adheres to the side surface of the test specimen 1000. Also, each of the first bottom plate 130 and the second bottom plate 140 has a flat adhesive surface that adheres to the bottom surface of the test specimen 1000. The adhesive used to bond the test specimen 1000 to the test specimen fixing part 100 is not particularly limited, but for example, a two-component epoxy resin adhesive can be used. The test specimen 1000, which is bonded and fixed to the test specimen fixing part 100, has a front portion and a rear portion that are bonded together, but has an unbonded portion in between (hereinafter, for convenience of explanation, referred to as the "intermediate portion of the test specimen 1000").

[0028] A pair of first fixing brackets 110 are connected by a connecting plate 150 extending in the y direction, allowing their positions to be fixed. A connecting rod 160 extending in the x direction is also connected to the connecting plate 150. A connecting member 160a is provided at the end of the connecting rod 160 (i.e., the end opposite to the side connected to the connecting plate 150). The test specimen fixing section 100 is connected to the load generating section 200 using the connecting member 160a. The connecting rod 160 is inserted through a through hole provided in the bracing plate 170, which is approximately the same diameter as, or slightly larger than, the connecting rod 160. The bracing plate 170 is fixed to the support base 2000 by being screwed into screw holes provided in the support base 2000. Therefore, the bracing plate 170 prevents the bracing and twisting of the connecting rod 160, and can stabilize the connecting rod 160 even when a tensile load is applied to the test specimen fixing section 100. This allows a stable load to be applied to the test specimen 1000.

[0029] [2. Configuration of the load generating section 200] The load generating unit 200 is connected to the specimen fixing unit 100 and can apply a tensile load to the specimen 1000 fixed to the specimen fixing unit 100. The load generating unit 200 includes a load cell 210, a threaded rod 220, a nut 230, an elastic member 240, and a bracing plate 250.

[0030] A connecting member 210a is provided at one end of the load cell 210 in the x-direction, and a connecting member 210b is provided at the other end. The connecting member 210a can be connected to the connecting member 160a of the connecting rod 160. Therefore, the load generating section 200 is connected to the test specimen fixing section 100 using the connecting member 210a.

[0031] The threaded rod 220 is positioned to extend in the x-direction and is screwed onto a nut 230. By rotating the nut 230, the position of the nut 230 on the threaded portion of the threaded rod 220 can be changed. A connecting member 220a is provided at the end of the threaded rod 220 (i.e., the end on the load cell 210 side). The connecting member 220a is connected to a connecting member 210b of the load cell 210. The threaded rod 220 is inserted through a through hole in the bracing plate 250, which is approximately the same diameter as, or slightly larger than, the threaded rod 220. The bracing plate 250 is fixed to the support base 2000 by being screwed into a screw hole provided in the support base 2000. Therefore, the bracing plate 250 prevents the threaded rod 220 from vibrating and twisting, and can stabilize the threaded rod 220 even when a load is generated in the load generating section 200. This makes it possible to generate a stable load in the load generating section 200.

[0032] In the load generation unit 200, rotating the nut 230 causes the threaded rod 220 to pull the load cell 210. In other words, a load can be applied to the load cell 210 by rotating the nut 230, and the applied load can be quantified and controlled by the load cell 210. The specimen fixing unit 100 is connected to the load generation unit 200, and an arbitrary tensile load can be applied to the specimen fixing unit 100 while checking the numerical value in the load cell 210 of the load generation unit 200.

[0033] An elastic member 240 is positioned between the nut 230 and the bracing plate 250. The elastic member 240 is, for example, a spring, but is not limited to this. One end of the elastic member 240 may be fixed to the bracing plate 250, and it is positioned so as to bias the nut 230, which is screwed onto the threaded rod 220. If the elastic member 240 is not provided, the tensile load depends on the pitch of the threaded portion of the threaded rod 220, making precise control of the tensile load difficult. On the other hand, if the elastic member 240 is provided, the load cell 210 can be pulled not only by the rotation of the nut 230 but also by utilizing the elastic modulus of the elastic member 240, allowing for more precise control of the tensile load. It is also possible to suppress sudden changes in load.

[0034] As described above, the coating evaluation jig 10 allows for adjustment of the magnitude of the load applied to the test specimen 1000 using the threaded rod 220, nut 230, and elastic member 240. Therefore, the configuration including the threaded rod 220, nut 230, and elastic member 240 can also be called the load adjustment section.

[0035] [3. Configuration of the width measuring section 300] The width measuring unit 300 can measure the width (length of the slit 1010 in the x-direction) of the slit 1010 formed in the test specimen 1000. As shown in Figure 3, the coating 1100 is formed on the upper surface of the test specimen 1000, and the slit 1010 is provided along the y-direction so as to traverse the middle portion of the opposing sides of the test specimen 1000. When evaluating crack-following performance using the test specimen 1000, the upper part of the slit 1010 is split so that it cracks from the bottom surface to the top surface of the test specimen 1000, and the test specimen 1000 is then bonded and fixed to the test specimen fixing unit 100.

[0036] The test specimen 1000 can be selected according to the building material on which the coating 1100 is actually formed. For example, concrete or mortar can be used as the material for the test specimen 1000. Furthermore, while a synthetic resin-based floor coating material can be used as the coating 1100 to be evaluated, the coating evaluation jig 10 is also effective for evaluating the crack-following ability of coatings other than synthetic resin-based floor coating materials. Note that in Figure 3, the coating 1100 is formed on the entire upper surface of the test specimen 1000, but the coating 1100 may be formed on only a part of the upper surface of the test specimen 1000.

[0037] The width of the slit 1010 may be measured by inserting the terminals of the width measuring unit 300 into the slit 1010, or it may be measured non-contactually from a distance from the slit 1010. In other words, the width measuring unit 300 may be configured to measure the width by contacting the slit 1010, or it may be configured to measure the width non-contactually with the slit 1010. For example, the width measuring unit 300 may be a clip gauge or a laser displacement sensor, but is not limited to these. The width measuring unit 300 may also photograph the slit 1010 and measure the width based on the captured image.

[0038] Figures 1 and 2 show that the width measuring section 300 is positioned below the middle portion of the test specimen 1000, between the first bottom plate 130 and the second bottom plate 140. However, the positioning of the width measuring section 300 is not limited to this. The width measuring section 300 may also be positioned to the side of the middle portion of the test specimen 1000.

[0039] [4. Method for evaluating the coating film 1100 using the coating film evaluation jig 10] The following describes an evaluation method for evaluating the crack-following ability of a coating film 1100 using a coating film evaluation jig 10. Note that the evaluation method for the crack-following ability of a coating film 1100 using the coating film evaluation jig 10 described here is just one example, and the evaluation method is not limited to this.

[0040] First, a floor coating material is applied to the upper surface of the test specimen 1000 to form a coating film 1100. Next, the bottom surface of the test specimen 1000 is cleaned, and the first bottom plate 130 and the second bottom plate 140 are bonded to the bottom surface of the test specimen 1000 using adhesive. The sides of the test specimen 1000 are also cleaned, and a pair of first fixing brackets 110 and a pair of second fixing brackets 120 are bonded to both sides of the test specimen 1000 using adhesive. After the adhesive has hardened, the front and rear portions of the test specimen 1000 are bent to form cracks starting from the slit 1010. Care is taken to prevent cracks from occurring in the coating film 1100. In this way, the test specimen 1000, which is used to evaluate crack-following ability, is fixed to the test specimen fixing part 100.

[0041] Next, the pair of first fixing brackets 110, the pair of second fixing brackets 120, the first bottom plate 130, and the second bottom plate 140, which are bonded to the test specimen 1000, are installed on the support base 2000 and fixed to the support base 2000 with screws. Then, the pair of first fixing brackets are connected to the connecting plate 150. A connecting rod 160 is pre-attached to the connecting plate 150, which allows connection to the load generating section 200 using the connecting member 160a of the connecting rod 160. Then, the connecting member 210a of the load generating section 200, which is installed and fixed on the support base 2000, is connected to the connecting member 160a, thereby connecting the test specimen fixing section 100 and the load generating section 200.

[0042] Next, while monitoring the load cell 210, the nut 230 is rotated until it reaches a predetermined tensile load. This allows a predetermined tensile load to be applied to the test specimen 1000. By applying the tensile load until the coating 1100 breaks, the long-term crack-following ability of the coating can be evaluated.

[0043] The coating evaluation jig 10 according to this embodiment allows for precise setting of the tensile load, enabling the application of a tensile load to the test specimen 1000 more slowly than in a zero-span tension test. Therefore, the tensile load can be applied over a long period until the coating 1100 on the test specimen 1000 breaks, allowing for the evaluation of the long-term crack-following ability of the coating 1100.

[0044] In the above description, the coating evaluation jig 10 was set up parallel to the floor surface, and the connection direction between the test specimen fixing part 100 and the load generating part 200 was assumed to be the x-direction parallel to the floor surface. However, the coating evaluation jig 10 has a uniaxial direction for tensile load. Therefore, it is also possible to set up the coating evaluation jig 10 so that the direction of tensile load (i.e., the connection direction between the test specimen fixing part 100 and the load generating part 200) is perpendicular to the floor surface.

[0045] <Example 1> Referring to Figures 4 and 5, a modified example of the width measuring section 300A of the coating film evaluation jig 10 will be described. Note that in the following, explanations of configurations similar to those described above may be omitted.

[0046] Figure 4 is a schematic side view showing the configuration of the width measuring section 300A of the coating film evaluation jig 10 according to one embodiment of the present invention. Figure 5 is a schematic top view showing the configuration of the width measuring section 300A of the coating film evaluation jig 20 according to one embodiment of the present invention.

[0047] The test specimen 1000 shown in Figures 4 and 5 has a pair of small pieces 1200 attached to one side of the specimen 1000. The small pieces 1200 are so-called slit materials. The pair of small pieces 1200 are attached so that a slit 1010 is located between them. That is, with the slit 1010 in between, the pair of small pieces 1200 form a different slit 1210 from the slit 1010. The width of the slit 1210 corresponds to the distance between the pair of small pieces 1200 and is greater than the width of the slit 1010. The pair of small pieces 1200 may be attached by adhesive or by screws.

[0048] A width measuring section 300A is attached to the slit 1210. Figures 4 and 5 illustrate a clip gauge as an example of the width measuring section 300A. By inserting the terminals of the clip gauge into the slit 1210, the width of the slit 1210 can be measured. When a tensile load is applied to the test specimen 1000 and the width of the slit 1010 increases, the width of the slit 1210 also increases in proportion to the width of the slit 1010. Therefore, by measuring the width of the slit 1210, the width of the slit 1010 can be evaluated.

[0049] The coating evaluation jig 10 not only directly measures the width of the slit 1010 of the test specimen 1000, but also, as described in this modified example, it is possible to indirectly measure the width of the slit 1010 of the test specimen 1000 by forming another slit 1210 on one side of the test specimen 1000 with the slit 1010 in between, and measuring the width of the slit 1210. Since the width of the slit 1210 is larger than the width of the slit 1010, it becomes easier to insert the terminals of the width measuring section 300A, resulting in smaller errors and enabling evaluation of the width of the slit 1010 with high accuracy.

[0050] <Modification 2> Referring to Figure 6, a modified example of the test specimen fixing part 100A of the coating film evaluation jig 10 will be described. Note that in the following, explanations of configurations similar to those described above may be omitted.

[0051] Figure 6 is a schematic side view showing the configuration of the test specimen fixing section 100A of the coating film evaluation jig 10 according to one embodiment of the present invention.

[0052] As shown in Figure 6, the specimen fixing section 100A includes a friction-reducing sheet 180. The friction-reducing sheet 180 is provided between the first bottom plate 130 and the second bottom plate 140 and the support base 2000. The friction-reducing sheet 180 may be provided so as to overlap the entire surface of the first bottom plate 130 and the second bottom plate 140, or it may be provided so as to overlap a portion of the surface of the first bottom plate 130 and the second bottom plate 140. The friction-reducing sheet 180 has a surface roughness smaller than that of the first bottom plate 130, the second bottom plate 140, and the support base 2000. For example, a fluororesin or the like can be used as the material for the friction-reducing sheet 180.

[0053] When steel is used as the material for the first base plate 130, the second base plate 140, and the support base 2000, the frictional force between the first base plate 130 and the support base 2000, or between the second base plate 140 and the support base 2000, may become large. In this case, it is not possible to correctly evaluate the long-term crack-following performance. Therefore, as in this modified example, by providing a friction-reducing sheet 180 between the first base plate 130 and the second base plate 140 and the support base 2000, it is possible to suppress the application of unwanted forces such as friction to the test specimen 1000 in the direction (x direction) in which a tensile load is applied to the test specimen 1000. As a result, the crack-following performance of the coating can be stably evaluated, even over the long term.

[0054] <Second Embodiment> Referring to Figures 7 and 8, a coating film evaluation jig 20 according to one embodiment of the present invention will be described. Note that in the following, descriptions of components similar to those described above may be omitted.

[0055] Figure 7 is a schematic side view showing the configuration of a coating film evaluation jig 20 according to one embodiment of the present invention. Figure 8 is a schematic top view showing the configuration of a coating film evaluation jig 20 according to one embodiment of the present invention.

[0056] As shown in Figures 7 and 8, the coating evaluation jig 20 includes a test specimen fixing section 100 and a load generating section 400. The test specimen fixing section 100 and the load generating section 400 are arranged along the x-direction. The load generating section 400 of the coating evaluation jig 20 will be described below.

[0057] The load generating unit 400 is connected to the specimen fixing unit 100 and can apply a tensile load to the specimen 1000 fixed to the specimen fixing unit 100. The load generating unit 400 includes a wire 410, a weight 420, a pulley 430, and a pair of pulley fixing units 440.

[0058] A connecting member 410a is provided at one end of the wire 410, and a weight 420 is connected to the other end. The connecting member 410a can be connected to the connecting member 160a of the connecting rod 160. Therefore, the load generating section 400 is connected to the test specimen fixing section 100 using the connecting member 410a. The pair of pulley fixing sections 440 are arranged symmetrically in the y-direction so that a pulley 430 can be sandwiched between them. The pair of pulley fixing sections 440 rotatably support the pulley 430 and are fixed to the support base 2000 by being screwed into screw holes provided in the support base 2000. The weight 420 connected to the wire 410 is suspended in the z-direction via the pulley 430. The weight of the weight 420 is transmitted to the connecting rod 160 via the wire 410. In other words, in the coating film evaluation jig 20, a load is generated by the weight of the weight 420. Therefore, the magnitude of the resulting load can be adjusted by changing the weight of the 420 weight.

[0059] Although Figures 7 and 8 illustrate a configuration in which the weight 420 is directly connected to the wire 410, a container such as a box, plate, basket, or bag may be connected to the other end of the wire 410, and the weight 420 may be placed inside the container.

[0060] In the coating evaluation jig 20 according to this embodiment, the weight of the weight 420 can be easily adjusted, allowing a tensile load to be applied to the test specimen 1000 more slowly than in a zero-span tension test. Therefore, a tensile load can be applied over a long period of time until the coating 1100 on the test specimen 1000 breaks, and the long-term crack-following ability of the coating 1100 can be evaluated.

[0061] The embodiments described above can be implemented by combining their configurations as appropriate, as long as they do not contradict each other. Furthermore, any modifications made by those skilled in the art to the embodiments, such as adding, deleting, or changing the configuration, or adding, omitting, or changing the processes, are also included within the scope of the present invention, as long as they retain the essence of the present invention.

[0062] Any effects or benefits other than those brought about by the embodiments described above, if they are clear from the description herein or easily predictable to a person skilled in the art, are naturally considered to be brought about by the present invention. [Explanation of Symbols]

[0063] 10, 20: Coating film evaluation jig, 100: Test specimen fixing part, 110: First fixing bracket, 120: Second fixing bracket, 130: First bottom plate, 140: Second bottom plate, 150: Connecting plate, 160: Connecting rod, 160a: Connecting member, 170: Vibration prevention plate, 180: Friction reduction sheet, 200: Load generating part, 210: Load cell, 210a, 210b: Connecting member, 220: Threaded rod, 220a: Connecting member, 230: Nut, 240: Elastic member, 250: Vibration restraint plate, 300, 300A: Width measurement section, 400: Load generating part, 410: Wire, 410a: Connecting member, 420: Weight, 430: Pulley, 440: Pulley fixing part, 1000: Test specimen, 1010: Slit, 1100: Coating film, 1200: small piece, 1210: slit, 2000: Support Platform

Claims

1. A test specimen fixing part that adheres to a test specimen having a coating film on its upper surface and fixes the test specimen to a support base, A load generating unit connected to the test specimen fixing unit generates a tensile load to be applied to the test specimen, A coating film evaluation jig, comprising: a width measuring unit for measuring the width of a slit directly or indirectly formed in the test specimen.

2. The aforementioned test specimen fixing part is, A first adhesive fixing part is connected to the load generating part and has an adhesive surface that adheres to the side surface of the first part of the test specimen, It includes a second adhesive fixing portion having a gap with the first adhesive fixing portion and having an adhesive surface that adheres to the side surface of the second portion of the test specimen, The coating film evaluation jig according to claim 1, wherein the slit is formed between the first portion and the second portion.

3. The aforementioned test specimen fixing part further, Below the first adhesive fixing portion, a first bottom plate having an adhesive surface that adheres to the bottom surface of the first portion of the test specimen, The coating film evaluation jig according to claim 2, further comprising: a second bottom plate having an adhesive surface that adheres to the bottom surface of the second portion of the test specimen, located below the second adhesive fixing portion.

4. The coating film evaluation jig according to claim 3, wherein a friction-reducing sheet is provided beneath the first bottom plate and the second bottom plate.

5. The coating film evaluation jig according to claim 2, wherein the width of the slit corresponds to the distance between two small pieces attached to the test specimen between the first adhesive fixing portion and the second adhesive fixing portion.

6. The aforementioned load generating section is A load cell connected to the aforementioned test specimen fixing part, It includes a load adjustment unit connected to the load cell and for adjusting the tensile load, The coating film evaluation jig according to claim 1, wherein the load adjustment section includes an elastic member.

7. The load cell is connected to the load adjustment unit via a vibration-damping plate fixed to the support base. The coating film evaluation jig according to claim 6, wherein the elastic member is provided on the opposite side of the load cell from the bracing plate.

8. The load adjustment section further includes a nut for adjusting the magnitude of the tensile load and a threaded rod having a threaded portion that screws into the nut. The coating film evaluation jig according to claim 6, wherein the threaded rod is arranged in an axial direction parallel to the connection direction between the load cell and the test specimen fixing part.

9. The coating film evaluation jig according to claim 1, wherein the load generating part includes a weight connected to the test specimen fixing part via a wire.

10. A slit is provided from the bottom surface toward the top surface of the test specimen so as not to separate, and a floor coating material is applied to the top surface to form a coating film. The first and second bottom plates of the coating evaluation jig are bonded to the bottom surfaces of the front and rear portions of the test specimen, which are separated by the slit. The first and second fixing brackets of the coating evaluation jig are attached to the respective sides of the front and rear portions. The test specimen is bent to form a crack in the test specimen originating from the slit. The first fixing bracket, the second fixing bracket, the first bottom plate, and the second bottom plate are fixed to the support, The load generating part of the coating evaluation jig is connected to the first fixing bracket. A coating film evaluation method comprising generating a load at the load generating section so that a tensile load is applied to the test specimen.

11. The load generating unit includes a load cell, The coating film evaluation method according to claim 10, wherein the tensile load is adjusted by the force pulling the load cell.

12. The load generating unit includes a weight, The coating film evaluation method according to claim 10, wherein the tensile load is adjusted by the weight of the counterweight.

13. The coating film evaluation method according to any one of claims 10 to 12, wherein the aforementioned floor coating material is a synthetic resin-based floor coating material.

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