Color fastness to sunlight can also be called color fastness to light. It refers to the degree to which the color of the textile changes color under the action of sunlight or light after the textile has been dyed or printed.
The solar color fastness tester is used for lightfastness experiments on various textiles, leather, plastics and other materials. By adjusting the irradiance, temperature and humidity in the test chamber, it simulates the natural conditions required for the experiment. Conditions for testing changes in color and performance of the sample, as well as resistance to light aging of the material. Qisnun Precision Mechanical and Electrical Technology Co., Ltd. can independently develop and produce domestic instruments, and can also act as an agent for imported brand name products. Customers in need are invited to acall on time. To inform.
Applicable standards:
AATCC 16, ISO 105-B02, ISO 105-B04, JIS 0843, GB/T 16991-1997, GB/T 8430-1998
Additionally, the chemical bonds in the dye are changed or even broken to the extent that the structure of the chromophore group and auxochromic group in the dye is destroyed. Thus losing color; It is also possible that under the irradiation of ultraviolet rays, the three-dimensional structure of the dye changes, causing a color change, which is manifested as a color change. The degree of resistance to color change of a certain dye in sunlight is the sunfastness of the dye. , also known as sunfastness. For this reason, the factors affecting the color fastness of materials to light are mainly related to the following points.
It is linked to the structure of the dye:
From oneGenerally speaking, the light fastness of anthraquinone dyes, phthalocyanine dyes, sulfide blue and metal complex dyes in sulfidation is relatively good, and the light fastness is relatively good. The light fastness of most insoluble azo dyes is relatively high, while the light fastness of aniline-type azo dyes is low, and triaryl methane is not light fast.
This is related to the type of fiber:
The same dye has very different light fastness on different fibers. For example, indigo is lightfast on wool but not on cellulose. However, the light resistance is very low. Another example: the fastness to light of varamine B blue salt on viscose is much higher than that on cotton.
It is linked to the concentration of the dye:
The fastness to light of the same dye on the sameThe fiber type changes with the change in dye concentration. Generally, the lightfastness of a low concentration is faster than that of a high concentration. The degree is low, which is particularly evident on azo dyes.
It is linked to the influence of external conditions:
The level of humidity in the air and the level of temperature also have a great influence on the fastness to the sun. Generally, exposure to the sun is done when the humidity is high. The rapidity that Is weak, such as: varamine blue is easier to redden and fade in the south than in the north.
Related to additives:
There are now many additives that can effectively improve lightfastness.
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