Outdoor aging is mainly related to three factors: light, temperature, and humidity. Any one of these factors will cause the ink to age, and the three will work together to cause the greatest degree of aging. The xenon lamp aging test chamber is usually used to test these three factors.
Illumination: The chemical bonds of polymer materials are sensitive to different wavelengths of light in sunlight. Short-wavelength ultraviolet rays are the main cause of aging of most polymers. However, for some prints and inks, in addition to the short-wavelength ultraviolet rays in sunlight, long-wavelength ultraviolet light or even visible light may affect its products, causing discoloration or discoloration.
Temperature: The aging reaction is a photochemical reaction. Although the temperature does not affect the photoreaction rate, it will affect the subsequent chemical reaction rate. Therefore, the effect of temperature on ink aging is non-linear.
Humidity: Water will directly participate in the aging reaction of the ink. Studies have shown that outdoor materials are wet for long periods of time (average of 8 to 12 hours per day), and dew is the main cause of moisture in outdoor materials.
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