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UV aging test chamber paint weather resistance and light resistance test method

2022-12-30

In the xenon arc radiation test, high purity water is required to prevent deposits on the surface of the test plate, so the operating cost is high. At this stage, many domestic and foreign weather resistance and light resistance tests use ultraviolet light aging test chambers, which are available from Shanghai QINSUN Precision Electromechanical Technology Co., Ltd. Welcome customers who have questions.

Ultraviolet Light Aging Test:

The Ultraviolet Light Aging Test is an ultraviolet aging test box that uses a fluorescent ultraviolet lamp to measure the impact of sunlight on durability. Destructive effects of aggressive materials. Unlike xenon arc lamps, fluorescent UV lamps are electrically similar to regular cold fluorescent lamps for lighting, but produce more ultraviolet light than visible or infrared light.

For differentnth lighting applications, there are different types of lamps with different spectrums to choose from. The UVA-340 lamp simulates sunlight well in the main short-wavelength ultraviolet spectral range. The spectral power distribution (SPD) of the UVA-340 lamp is very similar to the spectral map extracted from the solar spectrum at 360 nm. UV-B lamps are also commonly used for accelerated artificial weathering tests. It destroys materials faster than UV-A lamps, but the energy output at shorter wavelengths than 360nm will cause deviations from the actual test results for many materials.

Control of irradiance (light intensity) is necessary to obtain accurate and reproducible results. Most UV weathering testers are equipped with an irradiance control system. These irradiance control systems allow the user to select the irradiance metric when conducting experiments. Throughby means of the feedback control system, the irradiance can be continuously and automatically monitored and regulated. The control system automatically compensates for insufficient lighting caused by lamp aging or other reasons by adjusting the lamp power.

UV fluorescent lamps simplify radiation control due to their inherent spectral stability. All light sources fade over time. But fluorescent lamps, unlike other types of lamps, do not change their spectral energy distribution over time. This property increases the reproducibility of test results and is therefore a great advantage.

Some tests have shown that there is no significant difference in the output power of a lamp that has been used for 2 hours and a lamp that has been used for 5600 hours in an aging test system equipped with irradiation control. Able to maintain constant light intensity.In addition, the distribution of their spectral energy does not change, which is very different from xenon arc lamps.

One of the main benefits of using an ultraviolet light aging test is that it can simulate the damage to materials in a more realistic outdoor humid environment. When the material is placed outside, according to statistics, it often suffers from moisture for at least 12 hours a day. Since most of this humidity is in the form of condensation, a special condensation principle is used to simulate the humidity in the outdoor air in the accelerated artificial weathering test.

During this condensation cycle, the water tank at the bottom of the test chamber is heated to generate steam. The hot steam keeps the environment of the test chamber at a high temperature with 100% relative humidity. The test chamber is designed in such a way that the test panel actually forms the side wall of the test chamber. The backsideof the panel is thus exposed to room air at room temperature. The cooling effect of the room air cools the surface of the panel under test several degrees below the steam temperature.

Lab

The temperature difference of a few degrees allows the water to continuously drip onto the tested surface during the condensation cycle.

The condensationThe thus produced sate is stable, pure distilled water. This water improves the reproducibility of experimental results, eliminates water sediment contamination problems and simplifies the installation and operation of test equipment. Because the material is generally exposed to moisture outdoors for a long time, a typical cyclic condensing system should have a test time of 4 hours. The condensation process is carried out under heating conditions (50°C), which will significantly accelerate the moisture degradation of the material. Condensatecycles performed under prolonged heating conditions are more effective in reproducing the phenomenon of damage to materials in humid environments than other methods such as water spraying, immersion and other high humidity environments.

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