What is UV Lamp Accelerated Aging Test?
Answer: The sample is exposed to ultraviolet light and (or) condensation atmosphere. After the specified test period, the test of measuring its gloss and color difference and evaluating the aging of the coating surface such as discoloration, loss of light, and chalking is called UV lamp acceleration. Aging test, this test is used to test the ability of color-coated panels to withstand accelerated aging.
The test is generally carried out through a special ultraviolet lamp test box. Before and after the test, the gloss and chromaticity , and the color difference should be calculated. Finally , the coating should be evaluated according to the GB/T 1766-95 standard "Rating method for the aging of paint and varnish coatings". Grades of discoloration, loss of gloss, and chalking.
The test can be carried out according to the test methods of five different cycles of ultraviolet lamps provided by GB/T 13448-2006 (see the table below).
| serial number | operation method | Experiment cycle and conditions | light type | Irradiation intensity/W (m 2 nm) -1 | wavelength/mm |
| 1 | continuous light | UV light, black panel temperature (6 0±3) ℃ | UVA-340 | 0.44 | 340 |
| 2 | Alternate light and condensation | 12 hours is a cycle; 8 hours of ultraviolet light, the temperature of the blackboard is (60 ±3) ℃; 4 hours of condensation, the temperature of the blackboard is (50±3) ℃ | UVA-340 | 0.77 | 340 |
| 8h is the cycle period; 4h UV light, blackboard temperature is (60±3)℃; 4h cooling, blackboard temperature is (50±3)℃ | UVB-313 | 0.63 | 310 | ||
| 3 | Alternate light and water spray (dark) and condensation | 12 hours is a cycle; 8 hours of ultraviolet light, the temperature of the blackboard is (70 ±3) ℃; 4 hours of condensation, the temperature of the blackboard is (50±3) ℃ | UVA-340 | 0.72 | 340 |
| 12h is the cycle period; 8h UV light, blackboard temperature is (60±3)℃, 0.25h water spray, 3.75h condensation, blackboard temperature is (50±3)℃ | UVA-340 | 1.35 | 340 |
Regarding the artificial accelerated aging test equipment, by the end of the 1960s, domestic colleges and universities and research institutes mostly imported products from the United States, West Germany, and Japan. Since the 1970s, my country has successively developed sunlight, ultraviolet, and simple lamp aging instruments. In recent years, with the development of material science and the popularization and application of computer measurement and control technology, a number of domestic test methods are applicable to the standard requirements of multiple test methods , which can simulate six environmental climates such as sunlight, rain, condensation, temperature, humidity, and wind speed, and have microcomputer intelligence. The new and updated products of the control
