JP5986059B2 - Accelerated weathering test method and apparatus - Google Patents

Description

  The present invention relates to an accelerated weathering test method and apparatus for evaluating the weather resistance of a polymer material.

  Xenon arc lamp type accelerated weathering tester (hereinafter referred to as XWOM) specified in "JIS K5600-7-7", "JIS K 7350-2", etc. is used for evaluating the weather resistance of polymer materials used outdoors. ) Is the most commonly used. However, the test using this apparatus continues to irradiate light having a spectral radiant intensity approximate to that of midsummer sunlight, and the deterioration acceleration rate is not so high. For this reason, the long-term reliability evaluation using the above apparatus may require several thousand hours, and the evaluation time is required to be shortened.

  In order to shorten the evaluation time, there are apparatuses that irradiate ultraviolet rays having a higher light intensity (for example, Non-Patent Documents 1 and 2). However, when using a device that irradiates stronger ultraviolet rays, the state of deterioration may differ from actual outdoor exposure. Further, when weather resistance (ultraviolet light resistance) is evaluated using a device having a spectral radiation distribution different from that of sunlight, even if a result of material A> material B is obtained in a certain device, material A <material B is actually used outdoors. It has been reported that attention needs to be taken since this can occur (see Non-Patent Documents 3 and 4).

  The important thing when implementing accelerated degradation tests is that the accelerated degradation test equipment to be used should first be clarified by preliminary experiments in comparison with outdoor exposure and other accelerated degradation test equipment, and the difference between the two. It is in. In addition, from the results of this preliminary experiment, it is important to consider how long the test time is appropriate in order to ensure the required weather resistance.

  There are devices that irradiate stronger ultraviolet rays to shorten the evaluation time, but because the spectral radiant intensity is different from that of sunlight, the deterioration promotion rate when compared with outdoor exposure is calculated inappropriately. There are many cases that end. Particularly problematic are the following points. The temperature of the sample rises due to light absorption, and the surface temperature of the sample varies depending on the color of the sample. The closer to black, the higher the temperature. There is a problem that the difference in surface temperature due to the difference in color varies depending on the test apparatus.

For example, in XWOM, the xenon arc lamp is controlled so that the ultraviolet intensity in the wavelength range of 300 to 400 nm is 60 W / m ² , and the temperature of a black plate called a black panel is 63 ° C. The most common condition is to perform the test while controlling the temperature in the test tank to be 38 ° C. Here, the conditions under which the ultraviolet intensity in the range of 300 to 400 nm is 60 W / m ² are approximately the same as the ultraviolet intensity of sunlight in the middle of summer. In the accelerated weather resistance test, a black plate (blackboard) generally called a black panel or black standard is used. Strictly speaking, the black standard has a structure slightly different from that of the black panel, but basically has the same function. Hereinafter, these are collectively referred to as a blackboard.

Irradiation light from xenon arc lamp that approximates sunlight when irradiated with xenon arc lamp light under the condition of ultraviolet ray in the range of 300-400 nm 60W / m ^{2 and} no air inside the test chamber at 38 ° C Contains a large amount of visible and infrared light, and the blackboard generates heat due to the absorption of light, and the temperature rises to 63 ° C. or higher. For this reason, the wind speed in the apparatus is controlled to adjust the temperature of the blackboard to 63 ° C.

  If the sample surface temperature is close to black, the sample surface absorbs light well and generates heat, so that the surface temperature of the blackboard surface is close to 63 ° C. (blackboard temperature). On the other hand, if the sample is close to white or transparent, there is little heat generation due to light absorption, so the temperature is close to 38 ° C. in the bath temperature. XWOM irradiates light with a spectral radiation distribution very close to that of sunlight, so if the sample is irradiated with light intensity (standard setting) that is comparable to that of sunlight in midsummer, The temperature change (temperature difference) of the sample due to the color can also be regarded as outdoor exposure≈XWOM.

For this reason, for example, in an environment where the temperature is 38 ° C., the ultraviolet ray in the range of 300 to 400 nm is 60 W / m ² , the outdoor environment where the wind blows to the blackboard at 63 ° C., and the ultraviolet ray in the range of 300 to 400 nm in XWOM When the temperature inside the test chamber is set to 38 ° C. and the blackboard temperature is set to 63 ° C. under the condition of 60 W / m ^2, the sample temperature changes by the colors are almost the same. For this reason, there is no problem in the calculation for calculating the time of exposure as 1 year≈x time at XWOM.

  However, a problem arises in the case of a test apparatus using a light source having a spectral distribution significantly different from that of sunlight. For example, in the case of an ultraviolet fluorescent lamp type accelerated weathering tester, unlike sunlight and XWOM, the light source hardly emits light in the visible / infrared region. For this reason, when the blackboard temperature is set to the same 63 ° C., the blackboard does not generate much heat due to the irradiation of the ultraviolet fluorescent lamp, so the blackboard temperature is controlled to 63 ° C. by bringing the temperature in the test tank close to 63 ° C. Yes. In this state, the temperature change of the sample due to colors such as black and white is very small compared to sunlight and XWOM.

  A problem caused by the above-described difference will be described. Consider a case where a relationship such as “1 year of outdoor exposure≈x time at XWOM≈y time of an ultraviolet fluorescent lamp” is calculated through a preliminary experiment. At this time, when the experiment is performed with the blackboard temperature being the same, in the case of a sample other than black, there is a problem in that the temperature of the sample surface becomes higher in the ultraviolet fluorescent lamp type device as compared with outdoor exposure or XWOM. .

  A specific example will be described. For example, in the creation of the above-described relational expression, in order to conduct a preliminary experiment in a short period of time, a sample that is weak to ultraviolet rays intentionally extracted from the material of the article to be actually evaluated from which the pigment, ultraviolet absorber or light stabilizer is removed. Is used. After this sample was deteriorated by outdoor exposure and various types of accelerated weathering tester, parameters such as strength, spread, color difference, and gloss were measured. “Outdoor exposure 1 year ≒ xWOM x hour ≒ UV fluorescent lamp y time ”Is derived. Next, if the material to be evaluated (with pigments and additives) is an article that should be used outdoors for 10 years, examine the test time from the relational expression obtained in the preliminary experiment. For example, in the case of an ultraviolet fluorescent lamp, it is evaluated whether there is no problem after a test of 10 × y time for an ultraviolet fluorescent lamp.

  In the evaluation described above, a sample that is weak to ultraviolet rays that intentionally removes pigments, ultraviolet absorbers, and light stabilizers is often transparent or translucent. For this reason, this sample does not absorb much visible / infrared light and generates little heat. Here, it is assumed that the test is performed by simulating an environment in which the blackboard panel temperature is 63 ° C. due to sunlight in the middle of summer and the surrounding wind. In this case, the surface temperature of the transparent or translucent sample is on the order of 40 ° C. in the actual outdoors or XWOM. On the other hand, in the case of the ultraviolet fluorescent lamp type device, it is a device that does not irradiate visible / infrared light, and the temperature in the test chamber is raised and the blackboard is controlled at 63 ° C. Becomes less than 60 ° C. As described above, in the evaluation test of the ultraviolet fluorescent lamp type device, a very large temperature difference is generated from the 40 ° C. level outdoors or in XWOM.

  On the other hand, when the blackboard temperature is 63 ° C. and the material of the product to be evaluated (with pigments and additives) is black, the surface temperature of the sample is the actual outdoor, XWOM, or ultraviolet fluorescent lamp type device. The temperature becomes around 63 ° C. In addition, when the material of the product to be actually evaluated is yellow, if the blackboard temperature is 63 ° C., the surface temperature of the sample is about 50 ° C. in the actual outdoors and XWOM. The sample is at a temperature near 60 ° C.

  As described above, in the ultraviolet fluorescent lamp type apparatus, since the temperature change due to the color of the sample is small, the behavior is different from that of sunlight or XWOM where the temperature change due to the color is large. In general, the higher the temperature, the faster the chemical reaction such as oxidative degradation of the polymer proceeds. For this reason, there is a problem that a relational expression such as “1 year outdoor exposure≈y hour of an ultraviolet fluorescent lamp” created with a transparent or translucent sample is not very accurate in a colored actual product.

  For such a problem, if the device has a spectral radiation distribution that is significantly different from that of sunlight, in addition to an ultraviolet fluorescent lamp type accelerated weathering tester, a sunshine carbon arc type accelerated weathering tester, an ultraviolet carbon arc lamp The same applies to other devices such as a type accelerated weathering tester and a metal halide lamp type accelerated weathering tester.

  Also, in the xenon arc lamp type accelerated weathering tester, a device generally called a super xenon weather meter is similar in sunlight to spectral radiation distribution, but the radiation intensity is about three times that of midsummer sunlight. Irradiate extremely high light. In this apparatus, when the blackboard temperature is set to 63 ° C., the heat generation of the sample is three times that of a normal xenon arc lamp type accelerated weathering tester. For this reason, even if the air speed of the blower is increased in the device, the temperature test chamber cannot be maintained at 38 ° C., and depending on the device manufacturer and model, the temperature in the test chamber can be maintained between 20 ° C. and 30 ° C. It is said. The black sample is close to the blackboard temperature of 63 ° C., so there are few problems in comparison with the results of sunlight and XWOM, but the transparent, translucent, white sample, etc. has a temperature close to the temperature in the test chamber. For this reason, contrary to the case of the ultraviolet fluorescent lamp, the temperature is much lower than that of actual outdoor exposure or XWOM.

  In this way, even with a device using a xenon arc lamp whose spectral radiation distribution is very similar to that of the sun, if the spectral radiation “intensity” irradiated to the sample is different from that of sunlight, the temperature change due to light absorption It will behave differently from the standard test of sunlight and XWOM.

Shinji Iida, Hiromichi Takayanagi, Hiromichi Takayanagi, “Accelerated Weathering Test”, Research on Paints, No. 145, 22-37, 2006. Shinji Iida, Hiromichi Takayanagi, “Accelerated Weatherability Test (Part 2)”, Paint Research, No. 146, 26-39, 2006. Takashi Miwa, Morihiko Matsumoto, Yuichi Akage, Masamitsu Watanabe, Masaaki Takatani, "Comparison of UV degradation behavior of various low-density polyethylenes by various weathering testers", IEICE Society Conference 2012 Proceedings CD-ROM, 2012. Takashi Miwa, Yuichi Akage, Masamitsu Watanabe, Masaaki Takatani, “Comparison of Molecular Weight Change Behavior of Low-Density Polyethylene with Various Weathering Testers”, Proceedings of the IEICE General Conference 2013, CD-ROM, 2013.

  As described above, when trying to shorten the evaluation time by irradiating ultraviolet rays having a higher light intensity, there is a problem that the weather resistance cannot be accurately evaluated with a colored polymer material or the like.

  The present invention has been made to solve the above-described problems, and an object thereof is to enable more accurate evaluation of the weather resistance of a polymer material.

  The accelerated weathering test method according to the present invention irradiates a blackboard as a first sample and a standard sample made of a polymer material with sunlight or xenon arc lamp under the same conditions, and the surface of the blackboard The first step of measuring the surface temperature of the first sample when the temperature reaches the set temperature and setting it as the test temperature, and the surface temperature of the second sample made of the above material controlled to the test temperature, the material And a second step of performing a weather resistance test by irradiating the second sample with light from a light source having a higher intensity of ultraviolet rays than that of the xenon arc lamp.

  In the accelerated weathering test method, the second sample is the first sample, and in the first step, the test temperature may be measured under a condition in which the first sample does not deteriorate.

  The accelerated weathering test apparatus according to the present invention irradiates sunlight or xenon arc lamp light under the same conditions on the first sample made of a polymer material and the blackboard as a standard sample. Temperature measuring means for measuring the surface temperature of the blackboard and the first sample, a thermostat housing the second sample made of the above material, and a temperature when the temperature measured by the temperature measuring means reaches a set temperature. The temperature control means for controlling the surface temperature of the second sample accommodated in the thermostatic bath to the test temperature which is the surface temperature of the first sample measured by the measuring means, and the material for the second sample accommodated in the thermostatic bath A light source that irradiates light whose intensity of ultraviolet rays to be deteriorated is higher than that of a xenon arc lamp, and the temperature control means and the light source are controlled to irradiate the second sample with light from the light source with the surface temperature of the second sample set to the test temperature. test And a control means.

  The accelerated weathering test apparatus includes a xenon arc lamp accommodated in a thermostat, the second sample is a first sample, and the temperature measuring means includes a blackboard and a surface temperature of the first sample accommodated in the thermostat. The temperature control means controls the surface temperature of the first sample to the test temperature based on the surface temperature of the first sample measured by the temperature measurement means.

  As described above, according to the present invention, it is possible to obtain an excellent effect that the weather resistance of the polymer material can be more accurately evaluated.

FIG. 1 is a flowchart for explaining an accelerated weathering test method according to an embodiment of the present invention. FIG. 2 is a configuration diagram showing the configuration of the accelerated weathering test apparatus in the embodiment of the present invention. FIG. 3 is a configuration diagram showing the configuration of the accelerated weathering test apparatus in the embodiment of the present invention. FIG. 4 is a configuration diagram showing the configuration of the accelerated weathering test apparatus in the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a flowchart for explaining an accelerated weathering test method according to an embodiment of the present invention.

  The accelerated weather resistance test method in the embodiment measures (determines) the test temperature in the first step S101 by the following. First, a first sample made of a material composed of a target polymer is prepared. Also, prepare a blackboard as a standard sample. The first sample and the blackboard are irradiated with sunlight or xenon arc lamp light under the same conditions. A xenon arc lamp is a light source having a spectral radiation distribution similar to sunlight. With this irradiation continued, the surface temperature of the first sample when the surface temperature of the blackboard reaches the set temperature is measured as the test temperature.

  Next, in the second step S102, a weather resistance test is performed at the measured test temperature. In the weather resistance test, the second sample is irradiated with light from a light source whose ultraviolet intensity that degrades the material is higher than that of the xenon arc lamp while the surface temperature of the second sample made of the above material is controlled to the test temperature. Here, the first sample used in the first step S101 may be used as the second sample. In this case, in 1st process S101, the test temperature should just be measured on the conditions of the range which a 1st sample does not deteriorate.

  Next, an accelerated weather resistance test apparatus for carrying out the above-described accelerated weather resistance test method will be described with reference to FIG. The apparatus includes a temperature measurement unit 201, a xenon arc lamp 202, a thermostatic chamber 203, a temperature control unit 204, an acceleration test light source 205, and a test control unit 206.

The temperature measuring unit 201 is a surface temperature of the blackboard 222 and the sample 221 when the sample 221 made of a polymer material and the blackboard 222 that is a standard sample are irradiated with light from the xenon arc lamp 202 under the same conditions. Measure. The xenon arc lamp 202 can irradiate light with an ultraviolet ray in the range of 300 to 400 nm of 60 W / m ² . The thermostatic chamber 203 accommodates a temperature measurement unit 201, a xenon arc lamp 202, a sample 221, a temperature control unit 204, an acceleration test light source 205, and the like.

  The temperature control unit 204 sets the surface temperature of the sample 221 to the test temperature that is the surface temperature of the sample 221 measured by the temperature measurement unit 201 when the temperature measured by the temperature measurement unit 201 reaches the set temperature. Control.

  The acceleration test light source 205 irradiates the sample 221 accommodated in the thermostatic chamber 203 with light whose ultraviolet intensity that degrades the material constituting the sample 221 is higher than that of the xenon arc lamp 202.

  The test control unit 206 controls the temperature control unit 204 and the acceleration test light source 205 to irradiate the sample 221 with light from the acceleration test light source 205 in a state where the surface temperature of the sample 221 is the test temperature. Control sex testing.

  In addition, the accelerated weather resistance test apparatus in the embodiment includes a blackboard temperature measuring unit 207, a blower control unit 208, and an ultraviolet radiometer 209. The blackboard temperature measuring unit 207 measures the temperature of the blackboard 222. The air blowing control unit 208 controls the air inside the thermostatic chamber 203. The air temperature of the sample 221 and the blackboard 222 is controlled by the air flow control of the air flow control unit 208. The air blow control unit 208 can also be said to be temperature control means. The ultraviolet radiometer 209 measures the intensity of ultraviolet rays emitted from the xenon arc lamp 202 and the acceleration test light source 205.

  Next, an accelerated weathering test method using the above-described apparatus will be described. Below, the case where it is going to evaluate the weather resistance of polyethylene (material comprised from the polymer) product as a sample 211 using an ultraviolet fluorescent lamp as the light source 205 for acceleration tests is demonstrated. First, a polyethylene to which an additive such as a pigment is not added is used as a sample 221. In this case, the sample 221 deteriorates in a short time due to irradiation with ultraviolet rays. The sample 221 is translucent.

First, as shown in FIG. 3, in the first step, the sample 221 and the blackboard 222 are irradiated with light from the xenon arc lamp 202 to increase the temperature of both. The light to irradiate shall be the conditions which the ultraviolet rays of the range of 300-400 nm become 60 W / m < ² >. The intensity of the ultraviolet light may be controlled by the measurement result of the ultraviolet radiometer 209. The temperature of the blackboard 222 is 63 ° C., and the temperature inside the thermostatic chamber 203 is 38 ° C. These are conditions generally used in a xenon arc lamp type accelerated weathering tester.

  Although the above-described conditions may be changed, the above-mentioned conditions are basically preferable because the irradiation state of sunlight during the midsummer summer time is well simulated. If the test is performed assuming an area close to the polar region where the midsummer temperature or the ultraviolet intensity of sunlight is lower, the settings of the ultraviolet intensity, the temperature of the blackboard 222, and the temperature in the thermostatic chamber 203 are lowered. Also good. On the other hand, if an area with higher ultraviolet intensity and temperature is assumed, the settings of the ultraviolet intensity, the temperature of the blackboard 222, and the temperature inside the thermostatic chamber 203 may be lowered.

  In the first step, the translucent sample 221 does not absorb much visible / infrared light to be irradiated. For this reason, when the temperature of the blackboard 222 reaches 63 ° C., the surface temperature of the sample 221 measured by the temperature measuring unit 201 such as a radiation thermometer is 43 ° C., for example. The measured temperature of 43 ° C. is taken as the test temperature. Note that the first step is completed in a very short time until various temperatures are stabilized, and thus hardly contributes to the deterioration of the sample 221.

  Next, as shown in FIG. 4, in the second step, under the control of the test control unit 206, the accelerated weathering test is performed by irradiating the sample 221 with the light of the acceleration test light source 205. In the implementation of this test, the temperature in the thermostatic chamber 203 is controlled by the temperature control unit 204 while monitoring the surface temperature of the sample 221 by the temperature measurement unit 201 under the control of the test control unit 206, and the air blow control unit 208 The wind speed is controlled so that the surface temperature of the sample 221 is kept at 43 ° C. which is the test temperature. The sample 221 after the accelerated weathering test carried out in this way is compared with a sample of the same material that has been deteriorated by outdoor exposure or XWOM, and “outdoor exposure 1 year≈x time at XWOM≈y time of ultraviolet fluorescent lamp” The following relational expression is derived.

  Here, in the conventional method of aligning the blackboard temperature, for example, when the blackboard temperature is set to 63 ° C., as described above, the semi-transparent sample temperature is as low as 43 ° C., for example, when the xenon lamp is irradiated. On the other hand, when the accelerated weathering test using ultraviolet fluorescent lamp irradiation is performed, the temperature becomes the same as the blackboard temperature (for example, around 60 ° C.), so the deterioration is faster than the actual state, and the relational expression is greatly inaccurate. I understand that it becomes.

  Next, a case where the sample 221 is made of the same material as that of an actual product made of polyethylene to which an additive such as a pigment has been added will be described. As the test time, “y” obtained from the relational expression obtained as described above is used, and it is set to 10 × y time or longer with a margin. Here, when the color of the actual product is blue, the sample 221 absorbs the visible / infrared light emitted from the xenon arc lamp 202 in the first step to some extent. Therefore, in this example, when the temperature of the blackboard 222 is 63 ° C., the surface temperature of the sample 221 measured by the temperature measuring unit 201 is, for example, 52 ° C. Therefore, in this case, the test temperature is set to 52 ° C.

  In the next second step, the temperature and the wind speed in the thermostatic chamber 203 are controlled while monitoring the surface temperature of the sample 221 with the temperature measuring unit 201, and the surface temperature of the sample 221 is kept at the test temperature of 52 ° C. In this state, the accelerated weathering test is performed by irradiating the sample 221 with light from the acceleration test light source 205.

  In the conventional method using only the surface temperature control of the blackboard, when using a light source having a spectral intensity different from that of sunlight, the sample temperature when testing a sample other than black is compared with the actual outdoors or XWOM. It becomes too high or too low. On the other hand, according to the embodiment, the accelerated weather resistance test can be performed in the state where the surface temperature of the sample is substantially the same as that of the actual outdoors (at midsummer in the middle of summer) or XWOM. For this reason, the relational expression “external exposure 1 year≈x time at XWOM≈y time of ultraviolet fluorescent lamp” is established relatively accurately even for samples of different colors.

  The present invention can be used regardless of the type of lamp as long as the spectral radiation “intensity” irradiated to the sample is an accelerated weathering test apparatus different from that of sunlight. The present invention can be used even when a super xenon weather meter having a spectral radiation distribution very similar to sunlight but having light that is about three times stronger is used. In the super xenon weather meter, the heat generated by the light on the blackboard is large. Therefore, for controlling the temperature of the blackboard, the temperature of the blackboard is kept at 63.degree. For this reason, there was a problem that the surface temperature of the sample was too low in the test of a sample that was nearly white or transparent and did not generate much heat.

However, the super xenon weathermeter also reduces the output, and irradiates light containing 60 W / m ² of ultraviolet rays similar to a general xenon arc lamp type accelerated weathering tester, and the blackboard temperature is 63 ° C. The test temperature may be determined by measuring the sample surface temperature when the internal temperature reaches 38 ° C. The accelerated weather resistance test may be performed by irradiating light containing ultraviolet rays of 180 W / m ² with the surface temperature of the sample controlled to the test temperature determined in this way.

  According to the present invention, in an accelerated weathering test apparatus that irradiates light having a spectral radiant intensity greatly different from that of sunlight, the temperature of the sample surface is approximated to that of sunlight even when a sample having a color different from that of the product material actually used is used. By making it possible to control to the same temperature as XWOM having the spectral emission intensity, an appropriate deterioration acceleration rate can be calculated. Thus, according to the present invention, the weather resistance of the polymer material can be more accurately evaluated.

  The present invention is not limited to the embodiment described above, and many modifications and combinations can be implemented by those having ordinary knowledge in the art within the technical idea of the present invention. It is obvious. For example, in the above description, the first process and the second process are performed using the same apparatus, but the present invention is not limited to this. You may implement a 1st process and a 2nd process with a different apparatus. In addition, the apparatus that performs the first step may have an apparatus configuration that can irradiate the blackboard and the sample with sunlight instead of the xenon arc lamp. Further, the first step can be performed without a thermostatic bath.

  DESCRIPTION OF SYMBOLS 201 ... Temperature measurement part, 202 ... Xenon arc lamp, 203 ... Constant temperature bath, 204 ... Temperature control part, 205 ... Light source for acceleration test, 206 ... Test control part, 207 ... Blackboard temperature measurement part, 208 ... Air blow control part, 209 ... UV radiometer, 221 ... sample, 222 ... blackboard.

Claims (4)

When the blackboard, which is the first sample and the standard sample made of a polymer material, is irradiated with sunlight or xenon arc lamp light under the same conditions, the surface temperature of the blackboard reaches a set temperature. A first step of measuring a surface temperature of the first sample and setting a test temperature;
With the surface temperature of the second sample made of the material controlled at the test temperature, the second sample is irradiated with light from a light source whose intensity of ultraviolet rays for deteriorating the material is higher than that of the xenon arc lamp. And a second step of carrying out the test. In the accelerated weathering test method according to claim 1,
The accelerated weathering test method, wherein the second sample is the first sample, and in the first step, the test temperature is measured under a condition in which the first sample does not deteriorate. Measurement of the surface temperature of the blackboard and the first sample when the first sample and the standard sample blackboard made of a polymer are irradiated with sunlight or xenon arc lamp light under the same conditions. Temperature measuring means to
A thermostatic chamber for accommodating a second sample made of the material;
The test temperature, which is the surface temperature of the first sample measured by the temperature measuring means when the temperature measured by the temperature measuring means reaches a set temperature, is stored in the thermostat. 2 temperature control means for controlling the surface temperature of the sample;
A light source for irradiating the second sample contained in the thermostat with light having an ultraviolet intensity higher than that of the xenon arc lamp for deteriorating the material;
And test control means for controlling the temperature control means and the light source to irradiate the second sample with light from the light source in a state where the surface temperature of the second sample is the test temperature. Weather resistance test equipment. In the accelerated weathering test apparatus according to claim 3,
Comprising the xenon arc lamp housed in the thermostat;
The second sample is the first sample;
The temperature measuring means measures the surface temperature of the blackboard and the first sample accommodated in the thermostat,
The temperature control means controls the surface temperature of the first sample to the test temperature based on the surface temperature of the first sample measured by the temperature measurement means.

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