JPH03274441A - Tester of resistance to climate and light - Google Patents

Abstract

PURPOSE:To test a large amount of samples speedily without breaking the testing accuracy and the degree of freedom of the size of the sample by provid ing a plurality of light sources vertically in a testing tank. CONSTITUTION:A testing light source is obtained by aligning two upper and lower xenon lamps 1 on a vertical line passing approximately the center of a testing tank 2. A pair of sample holding frames 4 for setting a sample 3 are rendered independently rotatable around the respective light sources 1. A spray nozzle tube 5 is provided between each light source 1 and sample holding frame 4 to spray water to the surface of the sample 3, so that the whole surface of the sample rotating around the light source 1 can be uniformly sprayed. Moreover, a heater 6, a cooling device 7 and a humidity generating device 8 are provided adjacent to the test tank 2 to adjust the temperature and humidity within the tank 2. Accordingly, it becomes possible to simultaneous ly test under a plurality of combinations of conditions by one testing machine, and therefore shorten the testing time of various kinds of samples and achieve efficient testing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a testing machine for accelerated evaluation of weather resistance and photodeterioration of paints, plastics, etc.

[Prior Art and Problems] As shown in Figure 2, a conventional weather and light resistance tester has an artificial light source 1 such as a discharge lamp in the center of a test tank 2 and a sample holding frame 4 that rotates around it. Furthermore, in order to reproduce natural environmental conditions, it is equipped with a rain spray nozzle pipe 5, a temperature and humidity control device, etc. In addition, due to the increasing need to shorten the material development period in recent years,
A type of weathering and light resistance tester that irradiates high-intensity light as shown in Figure 1 has also been proposed. However, with these conventional testing machines, the conventional type shown in Figure 2 cannot obtain sufficient light intensity and requires a long testing time.
With a high-strength type such as 2237343, only a small number of test pieces can be attached in one test, and when evaluating a large amount of material, the number of repeated tests increases, which is inefficient. In some cases, the light intensity is secured by arranging a plurality of light sources in parallel within the sample holding frame, but in a parallel configuration, the shadows of the light sources interfere with each other, resulting in poor energy efficiency.

On the other hand, due to recent advances in weathering and light resistance evaluation technology, evaluation methods have been proposed for each material or each use environment to be evaluated, and weathering and light resistance test conditions have also become more diverse. Therefore, if you want to evaluate a variety of materials, it becomes necessary to repeatedly set various test conditions and conduct the test.
That time delay greatly impacts product development today. Therefore, in order to quickly evaluate materials, it is necessary to introduce and operate a large number of equipment at the same time, which is not economical due to the cost of equipment purchase, maintenance, installation space, etc.

[Means for Solving the Problems] The present invention has been made in view of these problems, and consists of a plurality of light sources arranged vertically in one test chamber, each with a separate and independent sample holding frame. This weather/light resistance tester is equipped with a temperature/humidity controller, a rain nozzle, etc., and is capable of testing each sample under the same or different combinations of conditions.

The reason why the present invention is groundbreaking is not only because the idea is original, but also because the technical problems described below have been solved through earnest efforts.

In other words, when trying to arrange light sources in series with conventional test machines, the cooling water piping and high-voltage electrical wiring were large and complicated, so it was not possible to simply arrange the light sources in a stacked structure at the desired position. There wasn't. Therefore, in realizing the present invention, the piping and wiring of the light source were redesigned to have a compact and robust structure, and to enable series arrangement. Furthermore, when the light sources are arranged in series, the wiring and piping for the lower light source crosses between the upper light source and the sample frame, causing a loss of light intensity in the upper stage and at the same time causing deterioration of the piping and wiring themselves. . Therefore, in the present invention, the above-mentioned problems are solved by changing the materials of the piping and wiring to make them as thin as possible.

[Example] FIG. 1 is a diagram showing an embodiment of the present invention.

In the figure, two xenon lamps 1, which are held vertically as light sources for weather resistance testing, are arranged one above the other on a vertical line passing through the approximate center of the test chamber 2, and are used to attach the sample 3. Two sets of sample holding frames 4 are provided so as to be independently rotatable about their respective light sources 1 (with the vertical line as the center axis). Further, spray nozzle pipes 5 for spraying water onto the surface of the sample 3 are arranged separately between the upper and lower light sources 1 and the sample holding frame 4, respectively.
The entire sample surface rotating around the light source 1 can be uniformly sprayed. Further, adjacent to the test tank 2, there are a heater 6, a cooling device 7, and a humidity generator 8 for controlling the temperature and humidity inside the test tank. Although not shown, test time, a power regulator for adjusting the irradiance of light source 1, a spray cycle, time setting device, etc. are provided corresponding to the upper and lower light sources, and test conditions can be set separately for each. It looks like this.

In the apparatus of this embodiment configured in this way, it is possible to change the irradiance on the surface of the sample 3 by changing the size of the sample holding frame 4.

For example, the irradiance of the light source 1 is maintained constant, and the sample holding frame 4 placed on the top is set to a size that is generally used in Distance 4 between the center of light source 1 and sample 3 surface
80mm), and the lower sample holding frame 4 is half that length (24mm).
0 mm), the irradiance on the three surfaces of the sample attached to the sample holding frame 4 at the bottom is about four times that of the top. In addition, by keeping the distance between the light source 1 and the surface of the sample 3 constant, and changing the output of each light source 1 using a power regulator etc.,
Another method is to change the irradiance of a surface. Also, the upper and lower light sources 1
Since the spray nozzle pipe 5 is provided independently corresponding to the sample holding frame 4, it is possible to perform a light resistance test with only irradiation with spray stopped in the upper part, and a weather resistance test with spray and irradiation in the lower part. be.

In addition, the temperature of the sample 3 surface changes depending on the radiant heat from the light source 1, the air volume and speed in contact with the front and back surfaces of the sample 3, and the temperature inside the test chamber 2. The air volume depends on the strength of the illuminance and the position of the sample holding frame 4.
It can be adjusted by changing wind speed, etc.

Therefore, by appropriately combining the intensity of irradiance, temperature, and presence/absence of spray on the three surfaces of the sample, various test conditions can be set, and different tests can be performed on the upper and lower surfaces at the same time. If the test conditions are the same for the upper and lower sides, it is also possible to test a long sample by mounting it across the upper and lower sample holding frames.

In addition, 9 is a rotation device for rotating the sample holding frame 4, and 10
is a blower for circulating and exhausting the air in test chamber 2.
It is.

Regarding the embodiment configured in this way, the upper and lower sample holding frames 4 are of the same high-intensity type (the distance between the center of the light source and the sample surface is 24
0+nm) sample frame, and the case where the same test conditions were set for the upper and lower rows was used as the test condition 1, and the case where the test conditions were set differently for the upper and lower rows was called the test condition 2, and Figure 2
Table 1 shows a comparison of the conventional machine shown in Table 1 with the conventional technology 1, the parallel 3-lamp type using the sample frame of the conventional model with the conventional technology 2, and the parallel 4-lamp type with the conventional technology 3. be.

It can be seen that under test conditions 1 and 2, the evaluation capability per unit power consumption (effective evaluation area x irradiance) is much greater than in conventional techniques 1.2 and 3.

Next, Table 2 and Figure 4.56 show data showing the uniformity of irradiance and black panel temperature measured by the illumination meter and black panel thermometer installed at the same position as the three surfaces of the sample when tested under each of the above conditions. Shown below. In addition, Fig. 3 (A) shows the case where an inclined sample holding frame is used in the apparatus of the example.
) is the measurement position of the irradiance and black panel temperature when a vertical sample holding frame is used in the prior art device.

As shown in Margin Table 2 below, the test conditions 1 and 2 according to the present invention are different from the conventional technique 1 in the shape of the sample holding frame.
Irradiance is ±5% of the set value at each measurement point.
The black panel temperature is within ±3°C, improving the evaluation ability without compromising the accuracy of the conventional model.

Further, test condition 2 is an example showing that tests under two conditions can be performed within one testing machine. Furthermore, it is clear from Table 2 and FIG. 5.6 that in the layout in which the light sources are arranged in parallel as in Conventional Technologies 2 and 3, it is not possible to ensure uniformity in both the irradiance and black panel temperature conditions.

In addition, considering the case where the reduction in irradiance due to lamp deterioration is corrected to a predetermined setting value, in the case of conventional technology 2.3, the irradiance distribution is non-uniform as shown in Figures 5 and 6, so optimal control is required. There is also the problem that it is extremely difficult.

[Effects of the Invention] As described above, the present invention has a structure in which multiple light sources are arranged vertically, so it is possible to test a large number of samples quickly without compromising test accuracy or freedom regarding sample dimensions. It became. In addition, conventionally, one testing machine was used to test one of the deterioration conditions.
Previously, only one combination of tests was conducted, but with the present invention, it is possible to simultaneously test under multiple combination conditions with one testing machine, reducing testing time for various samples and improving test efficiency. It has become possible to make a great contribution to this world. Furthermore, in the present invention, samples can be placed across the upper and lower stages, making it possible to evaluate long objects such as automobile bumpers, which was previously impossible.

[Brief explanation of drawings]

FIG. 1 is a schematic structural diagram of a weather resistance tester of the present invention, and FIG. 2 is a perspective view of a conventional weather resistance tester. 1... Xenon lamp, light source, artificial light source 2...
... Test chamber 3 - Sample 4 ... Sample holding frame 5 - Spray nozzle pipe 6 - Heater cooling device Humidity generator

Claims (1)

[Claims] In a weathering light resistance tester that has a light source for weathering light resistance testing in the center of the test tank and a sample holding frame that rotates around the light source, multiple sample holding frames that are separated and independent from each other are placed vertically in the same test tank. The light source to be irradiated is placed in the center of each sample holding frame, and each condition such as the intensity of irradiance on the sample surface, the level of temperature and humidity, and the presence or absence of artificial rain can be individually controlled. A weather/light resistance tester that allows testing of different deterioration conditions in combination in the same test chamber.