The UVA-340 lamp tube equipped with Qinsun UV aging test chamber offers a new solution. UVA-340 ultraviolet light source can well simulate the short wave ultraviolet light (<365nm part) in the solar spectrum. Since the short-wave ultraviolet light from the sun simulated by the UVA-340 ultraviolet light source is usually the main cause of polymer damage, the test results of this method theoretically have a better correlation with outdoor natural aging. Our company Shanghai QINSUN Precision Electromechanical Technology Co., Ltd. can provide UV aging testing machine and welcome customers who have questions. To verify this, we performed a series of experiments on the correlation between natural outdoor exposure and artificial accelerated aging using a UVA-340 ultraviolet light source.
This experiment uses epoxy paint,polyurethane paint and polyester paint, UV plastic Accelerated aging experiments and outdoor natural exposure were conducted, respectively, and the changes in gloss and color of the sample were recorded during the experiment.
Artificially accelerated aging experiment:
Artificial The accelerated aging test is performed in accordance with ASTM G154 Ultraviolet Aging Test Method for Non-metallic Materials. The experimental equipment is a UV accelerated aging test machine. The test box has a closed-loop feedback system that allows setting and controlling the intensity of the UV light irradiation. The test uses a UVA-340 ultraviolet lamp with a maximum light intensity of 343 nm and a cut-off point of 295 nm. To eliminate the influence of different temperatures on the experimental results, the test temperature was kept uniformset at 50 °C.
The experiment was tested under three different cycle conditions:
Condition 1: 4 hours irradiation with ultraviolet light, 4 hours condensation; the irradiance point of the UVA-340 lamp is controlled at 0.83 W/(m2 nm)@340nm; the temperature of the entire test cycle is controlled at 50°C. The UV radiation intensity in this test cycle is equivalent to the sunlight at noon in summer.
Condition 2: 4 hours of ultraviolet light irradiation, 4 hours of condensation; the irradiance point of the UVA-340 lamp is controlled at 1.35 W/(m2·nm)@340 nm; the temperature of the entire test cycle is controlled at 50°C. Condition 2 is basically similar to condition 1, but the irradiation is er.
Condition 3: 4 hours of UV radiation (100% UV radiation, no condensation, no dark cycle), the radiation point of the UVA-340 lamp is regulated at 1.35W/(m2 nm) @340nm; The temperature of the entire test cycle is controlled at 50°C.
Experiment with natural liOutdoor exposure:
Since the natural outdoor exposure conditions are very different in different places, three different typical climate types are selected here to accurately evaluate the experiment: subtropical climate (Miami Florida), desert climates (Phoenix, Arizona ) and industrial climates in the northern US (Cleveland, Ohio).
Outdoor natural exposure is strictly in accordance with ASTM G7 Non-metallic Materials Outdoor Natural Exposure Test Standard. The back plate of the tested sample is a 1.6 mm thick splint and the sample holder is 45°, facing south.