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Weather resistance and light resistance test of UV aging test chamber coating

Author:QINSUN Released in:2023-10 Click:93

At present, many domestic and foreign tests of weather resistance and light resistance of coatings use UV aging test chambers. Our company Qisnun Precision Mechanical and Electrical Technology Co., Ltd. can provide this equipment. Customers in need are encouraged to inquire. UV Lamp Irradiation Aging Test is a UV aging test chamber that uses fluorescent UV lamps to simulate the destructive effect of sunlight on durable materials. This is different from xenon arc lamps. UV fluorescent lamps are electrically similar to regular cool fluorescent lamps for lighting, but can generate more UV light instead of visible or infrared light.

There are different types of lamps with different spectra to choose from for different exposure applications. UVA-340 type lamps cannt well simulate sunlight in the main range of the short-wavelength ultraviolet light spectrum. The spectral power distribution (SPD) of UVA-340 lamps is very similar to the spectrum taken at 360 nm in the solar spectrum. UV-B lampPS are also commonly used lamps for accelerated artificial climate aging tests. It destroys materials faster than UV-A lamps, but its energy production at wavelengths shorter than 360 nm will cause deviations from actual test results for many materials.

Control of irradiance (light intensity) is necessary to obtain accurate and reproducible results. Most UV aging test equipment is equipped with an irradiance control system. These irradiance control systems allow users to select irradiance measurements whenof carrying out experiments. Through feedback control systems, irradiance can be continuously and automatically precisely monitored and controlled. The control system automatically compensates for insufficient lighting caused by lamp aging or other reasons by adjusting the lamp power.

Fluorescent UV lamps simplify irradiance control due to their inherent spectral stability. All light sources weaken over time. But fluorescent lamps, unlike other types of lamps, do not change their spectral energy distribution over time. This feature improves the reproducibility of test results and is therefore a major advantage.

Some tests have shown that there is no significant difference in the power output of a lamp used for 2 hours and a lamp used for 5,600 hours in a tes systemt aging equipped with irradiance control. . The irradiance control device Capable of maintaining a constant light intensity. In addition, their spectral energy distribution does not change, which is very different from xenon arc lamps.

One of the main advantages of using a violet lamp aging test is that it can simulate the detrimental effects of a more realistic outdoor humid environment on materials. According to statistics, when the material is placed outdoors, it is frequently exposed to moisture for at least 12 hours a day. Since this humidity effect mainly occurs in the form of condensation, a special condensation principle is implemented to simulate outdoor humidity during the accelerated artificial climate aging test.

During such a condensation cycle, the water tank at the bottom of the test chamber is heated to gecreate steam. Hot steam maintains the test chamber environment at 100% relative humidity at elevated temperatures. When designing the test chamber, the test plate should actually form the side wall of the test chamber. Test chart like this The back side is exposed to ambient air at room temperature. The cooling effect of the surrounding air causes the surface temperature of the test panel to be tested to be several degrees lower than the steam temperature. This several degree temperature difference allows water to continually fall onto the tested surface during the condensation cycle.

The condensed water thus produced is pure and stable distilled water. This water can improve the reproducibility of experimental results, eliminate water sediment contamination problems, and simplify the installation of test equipment and operation. Since materials usually take a long time to get wet outdoors, a typical circulating condensing system requires a testing time of 4 hours. The condensation process is carried out under heated conditions (50°C), which significantly accelerates moisture damage to materials. Condensation cycles under prolonged heating conditions are more effective at reproducing moisture-related hardware damage than other methods such as water spraying, soaking, and other high humidity environments.

Shanghai Fanbiao Textile Testing Technology Co., Ltd., as an enterprise integrating R&D, manufacturing, sales, training and service, is committed to putting more testing instruments to the market and to provide long-term textiles, leather, combustion test instruments, automobile interior materials, environmental climate aging,masks and protective clothing, etc. can also be customized to meet non-standard requirements. Targeted testing can be conducted according to customer requirements prior to purchase to ensure that the purchased instruments are suitable.