Accelerated aging test chamber Simultaneously simulates light, heat and rainfall in the visible environment of the atmosphere in one test chamber. It is a commonly used artificial accelerated aging test method. Among these simulation factors, the light source is the most important. Experience The artificial light sources currently used are trying to make the energy distribution curve within this interval close to the solar spectrum. The simulation and acceleration magnification are the main recommendations for the selection of technical committees related to polymer materials in the International Organization for Standardization (ISO) There are three kinds of light sources: serial arc light, sunlight carbon arc light and fluorescent ultraviolet light.
(1) Xenon arc lamp.
At present, it is believed that the spectral energy distribution of xenon arc lamps in known artificial light sources is most similar to that of ultraviolet and visible light in sunlight. By choosing a suitable filter, you can filter out most of the short-wave radiation that reaches the ground. Xenon lamps have strong radiation peaks in the near-infrared region of 1000 to 1200 nm and generate a lot of heat. Therefore, a suitable cooling device must be selected to take away this part of the energy. At present, there are two cooling methods for xenon lamp aging test devices on the market: water-cooled and air-cooled. Generally speaking, the cooling effect of water-cooled xenon lamp device is better than that of air-cooled type. At the same time, the structure is more complicated and the price is more expensive. Since the energy of the ultraviolet part of the xenon lamp increases less than the other two light sources, it is the lowest in terms of acceleration ratio.
(2) Fluorescent UV lamp.
In theory, the short-wave energy of 300 to 400 nm is the main factor causing aging. If you increase this energy, you can achieve the effect of rapid testing. The spectral distribution of the fluorescent UV lamp is mainly concentrated in the ultraviolet light portion, so a higher acceleration rate can be achieved. However, fluorescent UV lamps not only increase the ultraviolet energy in natural sunlight, but also the radiant energy that is not in natural sunlight when measured on the surface of the earth, and this part of the energy can cause unnatural damage. In addition, the fluorescent light source has no energy higher than 375 nm except for a very narrow mercury spectral line. In this way, materials that are sensitive to long-wavelength UV energy may not change as exposed to natural sunlight. Because these inherent flaws can lead to unreliable results, the simulation of fluorescent UV lamps is poor. However, due to its high acceleration magnification, rapid selection of specific materials can be achieved by selecting the right type of lamp.
(3) Sunlight type carbon arc lamp.
Sunlight carbon arc lamps are currently less commonly used in China, but it is a widely used light source in Japan. Most JIS standards use sunlight carbon arc lamps. Many Chinese auto companies that have joint ventures with Japan still recommend the use of this light source. The spectral energy distribution of sunlight-type carbon arc lamps is also closer to that of sunlight, but the ultraviolet rays are concentrated intensified at 370 to 390 nm. The simulation is less than that of xenon lamps, and the acceleration ratio is between that of xenon lamps and ultraviolet lamps.
