JPH0454173B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] This invention relates to a coating that is used to quantitatively measure the adhesion strength of a coating film applied to an object to be coated, and to understand the deterioration tendency of the coating film. This invention relates to a film adhesion strength measuring device.

[Conventional technology]

Figure 6 shows, for example, WKAsbeck, Paint and Varnish Productions.
Production,] (March 23, 1970 issue) shows a conventional coating film adhesion measurement device, and in the figure,
A cutting blade 17 is detachably mounted on a cutting blade mounting base 41. The arm 42 supports the cutting blade mounting base 41 and has a rotating mechanism with a shaft 43 as a fulcrum so that the cutting blade 17 can be pressed against the interface between the coating film and the material. The detector 44 is for detecting the cutting resistance of the coating film. A film thickness gauge 45 and a weight 46 for measuring the coating film thickness are attached to the arm 42.
The arm support base 47 to which the arm 42 is attached is moved up and down by operating the rotating tool 48. Holder 4
Reference numeral 9 holds the arm 42 up when not measuring. A moving table 54 and a support 55 are fixed to a nut 53 screwed onto a threaded rod 50 supported by bearings 51 and 52, and when the threaded rod 50 is rotated by a motor,
The cutting blade 17 attached to the arm 42 connected to the support column 55 moves from side to side. The painted board 5 is attached to a painted board mounting stand 56. 57 is a support of the device, and 58 is a recorder for recording interfacial cutting resistance force measurement data.

With the above configuration, the painted board 5 is mounted on the painted board mounting base 5.
6, and press the cutting blade 17 against the interface between the paint film of the painted board 5 and the material. The height of the arm support stand 47 is adjusted according to the thickness of the painted board 5. Next, when the coating film is peeled off, a force in the upward direction acts on the cutting blade 17, so that the cutting blade 17 is loaded with the weight 46. The rotation of the threaded rod 50 moves the arm 42 to which the cutting blade 17 is attached, and the cutting blade 17 peels off the coating, and the cutting resistance force at the coating film interface is detected by the detector 44 and recorded by the recorder. Record at 58. At the same time, the film thickness is continuously measured using a differential transformer type film thickness meter 45.

[Problem that the invention seeks to solve]

In the conventional coating film adhesion strength measuring device as described above, when the cutting blade 17 is pressed against the surface of the painted board 5, the cutting blade 17 is pressed against the surface of the painted plate 5 as shown in FIG. Both 17,5 as shown in
There was a problem in that the coating film adhesion strength was measured with the contact angle α between the two, making it impossible to obtain accurate measured values.

This invention was made to solve the above-mentioned problems, and can be measured when the contact angle α is zero.
The object of the present invention is to obtain a coating film adhesion strength measuring device that can obtain accurate coating film adhesion strength.

[Means for solving problems]

The coating film adhesion strength measuring device according to the present invention includes a sample mounting table that has a temperature controller and a sample fixing device and can be linearly displaced horizontally, and a cutting blade that can be linearly displaced vertically at right angles to the displacement direction of the sample mounting table. It is equipped with a support, a mechanism for adjusting the contact angle of the cutting blade, a pressure detector that detects the interfacial cutting resistance force generated when the cutting blade cuts the coating film, and a personal computer for waveform analysis.

[Effect]

In this invention, a computer performs Fourier transform processing to obtain data regarding the adhesion strength of the coating film and the material strength.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which a sample mounting table 4 is fixed to a sliding member 3 pivoted on a guide shaft 2 fixed to a support 1, and a painted plate 5 serving as a sample is mounted. It is attached to the sample mounting table 4 by a sample fixture 6. A threaded rod 8 is screwed into a nut 7 connected to the sample mounting table 4, and one end thereof is connected to a motor 9. The sliding member 3 is horizontally linearly displaceable along the guide shaft 2. Connecting member 10
A sliding member 12 slides on a guide shaft 11 fixed to the support base 1 via. A connecting member 13 fixed to the sliding member 12 is connected to a connecting member 15 fixed to the sliding member 14, and a guide shaft 16 slides up and down on the sliding member 14. One end of the guide shaft 16 is a cutting blade 17
The other end is a threaded rod, and a cutting blade holding knob 18 and a weight 19 are arranged on the other end. The weight 19 adjusts and sets the pressing force of the cutting blade 17 against the painted plate 5. As shown in FIG. 8, the L-shaped part 30 that is integrated with the connecting member 15 is provided with a micrometer 20, which is an adjuster whose tip can move forward and backward. For example, when the tip is moved downward, the fulcrum 31 is moved. At the center, the connecting member 15 and the sliding member 14 integral therewith are rotated clockwise, and the cutting blade support 16 is accordingly rotated to adjust the tip of the cutting blade 17 to be parallel to the surface of the sample.

The pressure sensor 21 fixed to the connecting member 10 is
The cutting blade 1 is connected via the sliding member 12 and the connecting rod 22.
Detect the repulsive force generated at 7. Measurement data is AD
The signal is AD converted by a converter 23, inputted to a personal computer 24, and waveform processed by a Fourier transform program to output a Fourier spectrum and a graph of a power spectrum autocorrelation function. A temperature regulator 25, such as a thermomodule, regulates the temperature of the sample.

With the above configuration, the test sample, for example,
Using a painted board 5 with a length of 150 mm, a width of 70 mm, and a thickness of 1 mm,
A 2 cm ² portion of the coating is peeled off to expose the material. This painted plate 5 is attached to the sample mounting table 4 using a mounting tool 6.
Attach the cutting blade 17 with a blade width of 4 mm.
Apply it to the exposed part of the painted board 5, and use the weight 19 to
Press so that a force of 600 g is applied to the painted plate 5. The tip of the micrometer 20 is moved up and down, and the sliding member 14 is rotated clockwise or counterclockwise about the fulcrum 31 to adjust the tip of the cutting blade 17 so that it is in parallel contact with the sample surface.

The motor is driven to move the painted plate 5 at a speed of 1 mm/mm, and the pressure detector 21 detects the interfacial cutting resistance force of the cutting blade 17 transmitted via the connecting rod 22 fixed to the sliding member 12. . First, cut the material part by 5mm, then cut the coating part by 15mm. The temperature of the painted board is -10 by thermomodule 25.
Adjust the temperature to a constant temperature within the range of ℃ to 60℃.

Figure 2 shows the cutting resistance force at the paint film interface, with the vertical axis showing the cutting resistance force at the paint film interface (Kg), and the horizontal axis showing the cutting distance at the paint film interface (mm).

The measurement data appears as a waveform, where A is the cutting resistance force on the element surface and B is the cutting resistance force at the interface of the coating film.

Figure 3 is a graph equivalent to Figure 2 that shows the interfacial cutting resistance when the material surface treatment of epoxy electrodeposition coatings is changed. If the chemical conversion treatment is different, the adhesion strength will be different, and the interfacial cutting resistance force and waveform will change, as shown in a, b, and c in the same figure.

Figure 4 shows a flowchart of the waveform analysis program, and the measurement data 31 of the interfacial cutting resistance force is
It is processed by the AD converter 32, inputted to the personal computer 33, and outputted to the file 34. After outputting the data in the file 34 as a graph, the processing range is input using the cursor on the screen, the measurement data is processed using the following Fourier transformation program 35, and the transformation result is output to the file.

This Fourier spectrum, power spectrum,
Input each file of autocorrelation functions and output 37 a graph.

FIG. 5 shows a power spectrum diagram obtained by Fourier transforming the interfacial cutting resistance force of the urethane paint, where the horizontal axis is the frequency (cps) and the vertical axis is the power spectrum (cm ² /sec ³ ). In the 160℃ heat resistance test, as the heating time increases, the power spectrum tends to decrease and the vibration frequency tends to increase.

The interfacial cutting resistance force is a force that is a combination of the coating film adhesion strength and the material strength, and its fracture form is recorded as a waveform. By Fourier transforming this measured value and performing waveform analysis, information for elucidating the essence of the phenomenon can be obtained.

In the above embodiment, a general coated plate having a film thickness of several 10 μm or more was described, but a coated film on a plastic board may also be used, and the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a sample mounting table that has a temperature controller and a sample fixture and is linearly displaced horizontally, and a cutting blade support that is linearly displaced vertically at right angles to the displacement direction of the sample mounting table. It is equipped with a cutting blade contact angle adjustment device, a pressure detector that detects the interfacial cutting resistance force generated when cutting the coating film of the cutting blade, and a PC for waveform analysis, so that the cutting blade contact angle can be adjusted. can be adjusted easily and accurately, and has the effect of obtaining highly accurate coating film adhesion strength values.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention,
Figure 1 is a front view, Figure 2 is an interfacial cutting distance-interface cutting resistance characteristic diagram, Figure 3 is an interfacial cutting resistance characteristic diagram of epoxy electrocoating paints applied to various chemically treated surfaces, and FIG. 4 is a flowchart of a waveform analysis program, and FIG. 5 is a frequency-power spectrum characteristic curve obtained by Fourier transformation of urethane paint. FIG. 6 is a front view of a conventional coating film adhesion strength measuring device. FIG. 7 is a perspective view showing the contact angle between the sample and the cutting blade, and FIG. 8 is a perspective view of the main part of FIG. 1. 4...Sample mounting table, 5...Painted plate (sample), 6
...Sample fixture, 3, 12, 14...Sliding member,
16... Cutting blade support, 17... Cutting blade, 19...
...Weight, 21...Pressure detector, 20...Micrometer (adjuster), 24...PC, 25...
air conditioner. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A sample mounting table that has a temperature controller and a sample fixing device and can be linearly displaced horizontally, a cutting blade support that can be linearly displaced up and down at right angles to the displacement direction of the sample mounting table, and a a cutting blade attached to a lower end and pressed against the sample on the sample mounting stand; a weight disposed at the upper end of the cutting blade support to adjust the pressing force of the cutting blade to the sample; and the cutting blade. an adjusting device that adjusts the contact angle of the cutting blade by rotating a support along a plane perpendicular to the advancing direction of the cutting blade; and a pressure detector that detects an interfacial cutting resistance force generated on the cutting blade. A coating film adhesion strength measurement device comprising: a computer for waveform analysis of measurement data;