JPH08145874A - Durability testing device for coating film - Google Patents

Abstract

PURPOSE: To provide a durability testing device for coating film that is comparatively compact and in which the drift velocity of water such as sea water, etc., can be freely set and continuous testing can be also carried out for a long period. CONSTITUTION: The title device is provided with a water tank body 1 having a sectional U-shape in which a specified qauntity of sea water is included and a rotary agitating means 2 for sea water that is installed in the central part of the body 1. One or at least two members for holding a test piece are provided on the inner wall face of the body 1 in freely attachably and detachably in order to freely hold a test piece coated with a paint.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating film durability test apparatus, and more particularly, to a coating film formed on the outer surface of a member for underwater use for measuring the durability and the like in real time. Endurance test equipment.

[0002]

2. Description of the Related Art When organisms such as barnacles, mussels, and algae adhere to the bottom of a ship, the resistance of the bottom of the ship increases, the speed of the ship slows, and fuel consumption deteriorates. Further, when these barnacles and the like grow, they damage the bottom of the ship. The ship bottom paint is a paint for preventing these attached organisms.

Currently, the mainstream ship bottom paint protects the ship's bottom from adhesion by organisms as the antifouling agent (a drug against living organisms) in the paint is dissolved by the coating film gradually dissolving in seawater. For this reason, it is important to measure the amount of paint dissolved and the amount of antifouling agent eluted in order to understand the life of the coating film and its effect on living things.

This kind of measurement, that is, the durability test of the coating film, is to measure the change of the coating film when the ship is immersed in the ocean for a certain period of time, and various methods have been conventionally considered.
In any of the methods, the test plate coated with the paint is immersed in flowing seawater, and after a certain period of time, taken out and the change of the coating film is measured. From this change in the coating film, various measurements such as reduction of the film thickness, reduction of the overall amount of the coating film, change of the surface roughness, or the elution amount of the antifouling agent can be performed. The life and durability of the film can be grasped.

As described above, the coating film applied to the outer plate of the hull is out of the hull depending on the degree of wear of the coating film, the elution rate of the antifouling agent contained in the coating film, the surface roughness of the coating film, and the like. The durability of the plates is significantly different. For this reason, it has been conventionally important to accurately grasp the degree of wear of the coating film and the elution rate of the antifouling agent contained in the coating film in order to improve the durability of the hull skin.

Regarding the durability test of the coating film, various testing devices have been recently developed. This is shown in FIGS.

First, the test device shown in FIG. 9 is a test device performed at sea, and a coating is applied to the rotating end surface of a disk-shaped rotating body (FRP disc) 51 having a diameter of about 1 meter. A plurality of test plates 52 are attached, and the disc-shaped rotating body 51 can be rotationally driven for a long time at a predetermined speed in consideration of the ship speed. During this period, the degree of wear of the coating film and the like are regularly measured.

In this case, the drive mechanism 53 outputs the rotation information of the disc-shaped rotating body 51 and the motor 55 for driving the disc-shaped rotating body 51 through the belt mechanism 54 using the stepped belt. The rotation measuring sensor 56 is provided, and the rotation speed of the motor 55 is appropriately variably set, whereby the speed corresponding to the ship speed can be set.

The test apparatus shown in FIG. 10 is the same as the test apparatus shown in FIG. 9 and is designed to be operated in a water tank.
A water tank body 60 having a U-shaped cross section for storing seawater is provided, and a disk-shaped rotating body 61 is arranged in the water tank body 60. As with the case of FIG. 9 described above, a plurality of test plates 52 with coating films are attached to the rotating end surface of the disk-shaped rotating body 61, and the disk-shaped rotating body 61 considers the ship speed. It is designed to be rotationally driven at a predetermined speed for a long time.

In FIG. 10, reference numeral 63 indicates a drive motor. The rotational force of the drive motor 63 is transmitted to the disc-shaped rotating body 61 via the speed transmission 64 and the torque converter 65. Further, reference numeral 66 indicates a tachometer, and reference numeral 67 indicates a flow velocity sensor. The outputs of the tachometer 66 and the flow velocity sensor 67 are amplified and sent to the recorder 68. Then, the relative moving speed and moving distance of the test plate 52 with respect to water are calculated and stored by the recorder 68, the duration is further recorded, and the test plate 52 portion is periodically pulled up during this period. The degree of wear of the coating film is measured. Further, reference numerals 65A and 65B indicate bearings, and reference numeral 6
8A shows an amplifier.

Further, the test apparatus shown in FIG. 11 has a diameter of 2
It has a closed flow channel 70 formed in a rectangular shape with a piping member of 50 to 300 [mmφ], and a pump 71 and a pump drive motor 72 are provided in a part of the closed flow channel 70. Further, in a part of the closed flow channel 70, a quadrangular test area 73 having a cross-sectional space of 100 mm × 100 mm is provided as a test section.

In the test area 73, on the upper and lower surfaces thereof,
Observation windows 73A and 73B are provided. The observation windows 73A and 73B are provided with acrylic glass 73Aa and 73Bb made of acrylic acid resin inside thereof.

Further, in this rectangular test area 73,
Test plates 52 are detachably mounted on both sides of the inner wall. Further, in FIG. 11, reference numeral 74 is a rectifying screen, reference numeral 75 is a flow velocity control valve, and reference numeral 75.
A flow meter is shown respectively. Further, reference numeral 77 indicates a thermometer, reference numeral 78 indicates a water tank, 78A indicates an atmosphere open pipe, and reference numerals 79A and 79B indicate water head difference measurement points.

For this reason, in the conventional example shown in FIG. 11, the closed flow channel 7 is provided with the test plate 52 fixed.
The velocity of running water within 0 can be freely variably set.

[0015]

However, in the above-mentioned conventional example, for example, the one shown in FIG. 9 is intended for the test in the ocean, and therefore, the apparatus becomes large in size, so that many equipments are required. It requires investment, and at the same time, there is a disadvantage that a long-term test cannot be performed due to biological adhesion in the test in the ocean.

Further, the one shown in FIG. 10 enables a test in a water tank, but since the rotating disk is rotated in seawater, seawater also rotates together in a small water tank. Therefore, it is necessary to make the water tank relatively large,
Therefore, there is a disadvantage that the entire apparatus becomes large.

Further, the components shown in FIGS. 11 to 12 are
Since the test plate 52 was fixed and a large amount of seawater was made to flow in the closed water channel 70 by piping, relatively good data in a state close to the natural state can be obtained, but the closed water channel 70 Not only is the equipment larger,
There has been an inconvenience that a large amount of cost is required for the power for flowing the seawater continuously for a long time.

[0018]

An object of the present invention is to improve the inconveniences of the conventional example, and in particular, it is a relatively small-sized coating film in which the flow velocity of water such as seawater can be freely set and which can be continuously tested for a long time. It is an object of the present invention to provide a durability test device for use.

[0019]

According to a first aspect of the present invention, there is provided a water tank main body having a U-shaped cross section for storing a predetermined amount of seawater, and a rotary stirring means for seawater provided in a central portion of the water tank main body. Is equipped with. Further, one or two or more test piece holding members for detachably holding the test piece to which the paint is attached are detachably mounted on the inner wall surface of the water tank body. This aims to achieve the above-mentioned object.

According to the second aspect of the invention, in the coating film durability test apparatus according to the first aspect, the float member is arranged at a position separated from the central axis of rotation of the rotary stirring means by a predetermined distance. Between the float member and the rotation center shaft, a float arm mechanism for holding the float member and rotating reciprocally around the rotation center shaft is provided. Furthermore,
The water tank body is equipped with a float detector that captures the passing movement of the float member and outputs a predetermined timing signal. Then, a configuration is adopted in which a speedometer for calculating the flow velocity of seawater in the water tank body is provided based on the output of the float detector. This aims to achieve the above-mentioned object.

Further, in the invention of claim 3, in the coating film durability test apparatus of claim 1 described above, a temperature for controlling the temperature of seawater in the water tank body to an arbitrary temperature in the water tank body. The configuration is such that a control means is installed side by side. This aims to achieve the above-mentioned object.

[0022]

First, information such as the temperature and flow velocity of seawater in the water tank body 1 is set in the main controller 22 by an external command, and the entire apparatus is operated.

As a result, in the invention according to claim 1, the rotary stirring means 2 is started and the seawater in the water tank body 1 gradually starts to rotate. Then, the rotary stirring means 2 operates so that the flow velocity of the seawater flowing along the inner wall of the water tank body 1 becomes equal to the set velocity.

In this case, in the second aspect, the float member 4 and the float arm mechanism 5 also rotate integrally. Therefore, the reflected signal from the float member 4 is detected by the float detector 11, and the timing information thereof is sent to the speedometer 12. The speedometer 12 calculates the flow velocity on the inner wall surface based on the timing information.

On the other hand, according to the third aspect, the temperature control means 7 is operated together with the operation of the rotary stirring means 2, and the heater portion 7a or the cooling portion 7b is driven so that the seawater reaches a predetermined temperature. In this case, since the seawater in the water tank body 1 is stirred by the rotary stirring means 2, the whole seawater is set to a predetermined temperature within a relatively short time. Then, thereafter, the operation is continued for a time (or the number of days) specified in advance with reference to the set temperature, and the durability test of the sample 100 in seawater is continued.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the embodiment shown in FIGS. 1 and 2, a water tank main body 1 having a U-shaped cross section for storing a predetermined amount of seawater, and a rotary stirring means 2 for seawater equipped in the central portion of the water tank main body 1 are provided. Is equipped with. On the inner wall surface of the aquarium body 1, one or more test piece holding members for detachably holding a sample 100 (see FIG. 8) as a test piece to which a paint is attached are provided as sample holders 3, 3, ... Is detachably equipped. Further, the water tank body 1 is equipped with a disc-shaped lid portion 1A made of a transparent member.

One or more (six in this embodiment) float members 4, which surround the rotation center shaft 2B of the rotary stirring means 2 and are located on the circumference at a predetermined distance from the rotation center shaft 2B. 4, ... are arranged. Between the float member 4 and the rotation center shaft 2B, a floating arm mechanism 5 that holds each float member 4 individually and reciprocally rotates around the rotation center shaft 2B is provided.

As shown in FIGS. 2 to 3, the floating arm mechanism 5 includes six arm members 5A for individually holding the above-mentioned six float members 4 at the ends thereof, and the six arms. A ring-shaped connecting member 5B that integrally connects the member 5A with the above-described rotation center shaft 2B portion, and a floating ring-shaped connecting member 5C that connects the leading ends of the six arm members 5A described above in an annular shape.
It is formed by and. Then, the rotation center shaft 2B described above is loosely inserted into the through hole 5Ba provided in the center shaft portion of the annular connecting member 5B. As a result, the floating arm mechanism 5 is allowed to rotate and move up and down, and is held on the rotation center shaft 2B described above.

Here, the float member 4, the arm member 5A and the float ring member 5C are made of a material that is lightweight and floats in water and has a small moment of inertia, such as foamed urethane. The annular connecting member 5B is formed of a material having a small frictional resistance, for example, a Teflon-based bearing member. Therefore, when the float member 4 and the floating arm mechanism 5 are set to the state shown in FIG. 1, the floating arm mechanism 5 can freely perform forward / reverse rotation and vertical movement without being affected by the rotation center axis 2B. It is held by the rotation center shaft 2B in the obtained state.

As shown in FIG. 1, the disc-shaped lid portion 1A of the water tank body 1 is equipped with a float detector 11 which captures the passing movement of the float member 4 and outputs a predetermined timing signal. There is. Here, in this embodiment, one of the above-mentioned six float members 4 is provided with a light reflection seal, and the other float members 4 are provided with a black seal or the like.

The float detector 11 is configured to detect the light reflected from the light reflecting seal and output the rotation information of the float member 4. Reference numeral 12 indicates a speedometer for calculating the flow velocity of seawater (velocity along the inner wall surface) in the water tank body 1 based on the output of the float detector 11. In this case, a light reflection seal may be attached to all of the six float members 4. Further, the water tank body 1 is provided with temperature control means 7 for controlling the temperature of the seawater in the water tank body 1 to an arbitrary temperature.

As shown in FIGS. 1 and 2, the rotary stirring means 2 includes the above-described rotation center shaft 2B and this rotation center shaft 2
A rotation drive mechanism 2A for supporting and rotating the B.
The rotary drive mechanism 2A is provided with a stirring blade member 2C fixedly mounted on the tip (the lower end in FIG. 1). Reference numeral 2D indicates a shaft connecting member. The rotary drive mechanism 2A operates under the control of a main controller 22 described later, and can rotate the above-described rotation center shaft 2B at a predetermined speed.

The temperature control means 7 is formed in the shape of a rod, and the heater portion 7a and the cooling portion 7b are immersed in the water tank body 1 except for the upper end portion thereof, and the cooler 7 for driving the cooling portion 7b.
B, and a temperature controller 7A that controls the operations of the cooler 7B and the heater portion 7a. Reference numeral 7E indicates a temperature sensor. The temperature sensor 7E is always arranged in seawater, and constantly measures the water temperature in the water tank body 1. This water temperature information is input to the temperature controller 7A. Further, as the temperature control means 7 in this embodiment, one capable of measuring the temperature in the range of -10 to +50 degrees is used.

In addition to the temperature sensor 7E, a thermometer 7F for directly displaying the water temperature is provided in the water tank body 1. Thereby, the operator can directly read the water temperature of the seawater in the water tank body 1.

Here, as shown in FIGS. 4 to 5, the heater portion 7a is detachably attached to the above-mentioned disc-shaped lid portion 1A via a tapered cylindrical rubber plug 8. As a result, the vibration resistance of the heater portion 7a is enhanced and water leakage is effectively prevented. Cooling unit 7b, temperature sensor 7E, thermometer 7
Similarly to the heater portion 7a, F is also detachably attached to the above-mentioned disc-shaped lid portion 1A via a cylindrical rubber plug (not shown). In this case, the heater portion 7a and the cooling portion 7b are arranged relatively close to each other in order to quickly perform the variable setting of the water temperature as shown in FIG. 1 in this embodiment.

In this embodiment, 12 sample holders 3 as test piece holding members are detachably mounted on the inner wall surface of the water tank body 1 described above.

The sample holder 3 is formed in a vertically long rectangular shape, and has a recess 3A on its surface into which the sample 100 as a test piece is fitted. In addition, on the back surface, one of the fastener surfaces 3 of the removable surface-bonding fastener
Ba is fixed. Corresponding to this, the other fastener surface 3Bb is fixed to the inner wall surface of the water tank body 1 described above.

Further, the sample holder 3 is provided with through holes 3a, 3a at the center of the upper and lower ends thereof, and sample fixing holes 3b, 3c are provided on both sides of the through holes 3a, 3a, respectively. It is provided. Then, in the sample fixing holes 3b and 3c, the concave portion 3 of the sample holder 3 is
After the sample 100 is fitted in A, the cord member 3E is inserted as shown in FIG. 8, whereby the sample 100 is fixed to the sample holder 3. Reference numeral 3Ea indicates a cord stopper. Further, the through holes 3a, 3a are used to project to the surface side of the sample 100 after the test is completed.

Further, in the above-mentioned embodiment, the above-mentioned rotary drive mechanism 2A has the main controller 2 installed in the recorder 21.
It has a function of being controlled to 2 and rotationally driving the above-mentioned stirring blade member 2C at a predetermined speed in either forward or reverse directions. The rotation information of the rotation drive mechanism 2A is obtained by the tachometer 23.
The rotation speed, torque, etc. are calculated via the torque meter 23A and sent to the main controller 22.

The main control unit 22 uses the sample seawater velocity information and the rotation information of the vane member 2C as input for the sample 1
The rotation drive mechanism 2A described above is driven and controlled so that the flow velocity on the surface of 00 becomes a predetermined velocity. In addition, the main control unit 22 has a function of setting forward or reverse rotation of the blade member 2C based on an external command and variably setting the temperature of seawater, and the switching timing thereof is also based on the external command. It has a function to set arbitrarily. The control information is recorded in the recording unit 24 via the main control unit 22 and is externally displayed.

For this reason, the above-described rotary stirring means 2 is controlled by the main control section 22 to enable not only forward and reverse rotation but also variable speed operation. Therefore, not only unidirectional but also turbulent flow is caused. It is also possible, and it is possible to conduct a test with a water flow that is closer to the flow in the natural world where the ebb and flow of tides repeat. Further, turbulent flow can be generated by changing the shape of the stirring blade member 2C.

Further, since the rotary stirring means 2 is equipped with the tachometer 23 and the torque meter 23A as described above, these values are continuously monitored, and the fluctuation of the flow velocity and the change of the water pressure with respect to the coating film. Etc. can be continuously measured. The control information is sent to the main controller 2
The data is recorded in the recording unit 24 via 2 and is externally displayed.

Next, the overall operation of the above embodiment will be described.

First, in accordance with an external command, information such as the temperature and flow velocity of seawater in the water tank body 1 is set in the main controller 22,
Operate the entire device.

As a result, the rotary stirring means 2 is activated and the seawater in the water tank body 1 gradually starts to rotate. Then, the main controller 22 drives and controls the rotary stirring means 2 so that the flow velocity of the seawater flowing along the inner wall of the water tank body 1 becomes equal to the set velocity. In this case, when the seawater in the water tank body 1 starts to rotate, the float member 4 and the float arm mechanism 5 also rotate integrally. Therefore, the reflected signal from the float member 4 is detected by the float detector 11, and the timing information thereof is sent to the speedometer 12. The speedometer 12 calculates the flow velocity of the inner wall surface portion based on the timing information and sends it to the main control unit 22. The main control unit 22 drives the rotary stirring means 2 based on this flow velocity information, and controls the flow velocity of the inner wall surface portion to a predetermined velocity within a predetermined rising time.

On the other hand, along with the operation of the rotary stirring means 2, the temperature control means 7 also operates, and the heater section 7a or the cooling section 7b is driven so that the seawater reaches a predetermined temperature. In this case, since the seawater in the water tank body 1 is stirred by the rotary stirring means 2, the whole seawater is set to a predetermined temperature within a relatively short time. During this time, the temperature sensor 7E constantly inputs the water temperature information to the temperature controller 7A. As a result, the temperature controller 7A uses the optimum control method to control the heater unit 7A.
The operation of a or the cooling unit 7b is controlled. Then, thereafter, the operation is continued for a time (or the number of days) specified in advance with reference to the set temperature, and the durability test of the sample 100 in seawater is continued.

Here, in the above embodiment, the durability test of the coating film on seawater was exemplified for seawater, but the same durability test may be performed on running water other than seawater.

Further, in the above embodiment, the float detector 11 is mounted on the disc-shaped lid portion 1A by making a hole, but it is necessary to make a hole on the disc-shaped lid portion 1A. Instead, it may be directly equipped.

Further, in the above embodiment, the case where one of the six float members 4 is equipped with the light reflecting seal is illustrated, but two or more (for example, all six) are equipped with the light reflecting seal. It may be configured to do so.

[0051]

Since the present invention is constructed and functions as described above, according to the present invention, in the invention according to claim 1, the cross section U is obtained.
Since the test piece with the paint is attached to the inner wall of the letter-shaped water tank main body, and the seawater of the water tank main body is stirred and moved by the rotary stirring means in a predetermined direction, the rotation operation of the rotary stirring means can be arbitrarily performed. It is possible to freely set the same environmental conditions as the movement of the ship's bottom in seawater, such as changing it, and even if it is a small facility, there is no adhesion by living things Since the test piece is not suspended and rotated unlike the conventional example, the weight and size of the rotary stirring means can be reduced, and in this respect, the structure of the entire device can be simplified and energy can be saved. The flow speed of water such as seawater can be freely set by changing the rotation operation of the rotary stirring means. Therefore, the ebb and flow of the tide is repeated. It is possible to provide a natural can be tested in the near water by the flow of the sea, excellent coating for durability test apparatus unprecedented called.

In the invention according to claim 2, the flow velocity of seawater in the water tank body can be constantly detected by the action of the float and the float detector. Therefore, according to the above-mentioned claim 1. In addition to the measurement conditions, it is possible to further variably set the conditions of seawater flow according to the navigation speed of the ship. Therefore, in addition to the effect of claim 1,
Further, an effect that more precise measurement data can be obtained is obtained.

Furthermore, according to the third aspect of the present invention, since the temperature control means for setting and controlling the temperature of the seawater to an arbitrary temperature is provided, the change of the paint with respect to the temperature change according to the course of the ship can be captured with high accuracy. Therefore, in addition to the measurement conditions according to claim 1 described above, an unprecedented excellent coating film durability test apparatus capable of obtaining more precise measurement data corresponding to temperature changes can be obtained. Can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

FIG. 2 is a detailed explanatory view with a part of the floating arm mechanism portion disclosed in FIG. 1 omitted.

FIG. 3 is a plan view showing a floating arm mechanism portion in FIG.

FIG. 4 is a partially omitted plan view showing the disc-shaped lid portion disclosed in FIG. 1;

5 is a diagram showing the heater unit disclosed in FIG.
FIG. 5A is an explanatory view showing the attached state, and FIG. 5B is a perspective view showing a tubular rubber plug.

FIG. 6 is an explanatory view showing a positional relationship between the water tank body disclosed in FIG. 1 and a test piece holding member (sample holder) mounted on the inner wall thereof.

7 is an explanatory view showing an example of the sample holder disclosed in FIG. 6, FIG. 7 (A) shows a perspective view seen from the front side, and FIG. 7 (B) shows a perspective view seen from the back side. Show.

8 is an explanatory view showing a state where a test piece (sample) is mounted on the sample holder disclosed in FIG.
FIG. 8A shows a perspective view seen from the front side, and FIG.
Shows its side view.

FIG. 9 is a perspective view showing a conventional example of a test device on the ocean with a part thereof omitted.

FIG. 10 is an explanatory diagram in which a part of a test device in a room showing a conventional example is omitted.

FIG. 11 is an explanatory view in which a part of the indoor test apparatus showing the conventional example is omitted.

12 is a cross-sectional view showing a part of the test area in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water tank main body 2 Rotating stirring means 2B Rotation center axis 3 Sample holder as a test piece holding member 4 Float member 5 Floating arm mechanism 7 Temperature control means 11 Float detector 12 Velocity meter 100 Sample as a test piece

Claims (3)

[Claims] 1. A water tank main body having a U-shaped cross section for storing a predetermined amount of seawater, and a rotary stirring means for seawater provided in a central portion of the water tank main body, wherein the paint is coated on the inner wall surface of the water tank main body. An endurance test apparatus for coating film, which is detachably equipped with one or more test piece holding members for detachably holding the attached test piece. 2. The coating film durability test apparatus according to claim 1, wherein the float member is disposed at a position separated from the rotation center axis of the rotary stirring means by a predetermined distance, and the float member and the rotation center are arranged. Equipped with a floating arm mechanism that holds the float member between itself and the shaft and reciprocally rotates about the rotation center axis, captures the passing movement of the float member and outputs a predetermined timing signal. The water tank main body is equipped with a float detector that operates, and a durability test for a coating film is provided, which is equipped with a speedometer for calculating the flow velocity of seawater in the water tank main body based on the output of the float detector. apparatus. 3. The coating film durability test apparatus according to claim 1, wherein the water tank body is provided with temperature control means for setting and controlling the temperature of seawater in the water tank body to an arbitrary temperature. Durability test device for coating film.