Is the color paste’s lightfastness and weather resistance the same?
The application of many coatings that use paint pastes as colorants requires the inherent color to be stable within a certain period of time. Generally, the light resistance of color paste refers to the quality technical index of the pigment, the main component of color paste, withstanding sunlight exposure. In the composition of sunlight, the part that is most damaging to the lightfastness of pigments is ultraviolet light (UV). When discussing the lightfastness of pigments, only the technical indicators of the pigment’s ability to withstand the light environment in the external environment are evaluated. In practice, it is difficult to accurately define weather conditions.
Pigment paste The weather resistance index is affected by a variety of external environmental factors, including sunlight, high-energy ultraviolet radiation, temperature, humidity and erosion by various impurities in the atmosphere. The weather resistance index of pigment paste can be measured using outdoor exposure experiments or artificial atmospheric aging equipment indoors to simulate the outdoor environment. Outdoor experiments usually select specific locations as experimental locations, and these experimental locations are often areas with harsh climate conditions (strong sunlight, severely polluted industrial atmosphere, etc.). Test sample plates are generally subjected to outdoor exposure experiments for 12 months or longer.
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