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In the standard terminology of the xenon lamp test chamber, "light resistance" (or color fastness) refers to the performance of the material when it is exposed to light to resist its subtle changes. The size of the change in appearance (if any) is affected by the amount of light incident on the material and the quality of the light, as well as the nature and composition of the material itself. The composition of the two mixtures is the same, but the ratio is different and the light resistance is different; the composition ratio of the two mixtures is the same, but the components are similar but not the same component, the light resistance is also different.
When exposed to natural light, because there are many variables (such as the intensity and spectral distribution of natural light, temperature, the nature of the relative wet charge and the amount of atmospheric pollutants), the test conditions will continue to change, so the test results are different from those in other occasions The results of similar experiments conducted cannot be related. Therefore, it is not advisable to simply express the result as a function of time.
The above reasons for space form the basis for comparing the lightfastness of two different samples of a coloring pigment. Each sample is added to the same components in the same ratio, and the two mixtures (in an appropriate manner) are exposed to the same amount and nature of light, and then they are tested for any differences in warranty. . To meet these exposure conditions, these mixtures must be placed side by side under the same light source for the same period of time.
In addition, the light resistance of the pigment is also affected by the presence of other pigments such as titanium dioxide. The xenon lamp test chamber standard provides this important aspect. The de facto base material (medium) is used to form a pigment dispersion. The test procedure is as follows Said.
It is important to make sure that the exposure changes are carried out before comparing the light resistance. It is not practical to assess the exposure when the change is only equivalent to the beginning of the perceptible change, and it is not advisable to wait until the major change occurs. Therefore, it is recommended to compare the changes in appearance when the known light-resistant pigments (the agreed reference pigments) reach levels 4 and 3 in GB 250-1995.
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