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Photobleaching mechanism, influencing factors and improvement methods of dyes 2

2) factors affecting the light fastness of dyes


1. The wavelength of the light source and the illumination light;

2. Environmental factors;

3. The chemical nature and structure of the fiber;

4. The bonding strength of the dye to the fiber;

5. The chemical structure of the dye;

6. Dye concentration and aggregation state;

7. The effect of artificial sweat on the fading of dyes;

8. Effect of additives.


3) the method for improving the light fastness of dyes


1. Improve the structure of the dye so that it can reduce the influence of the dye coloring system while consuming the light energy, thereby maintaining the original color; that is, the high light fastness dye commonly used. Such dyes are generally higher in price than ordinary dyes. For fabrics requiring high sun exposure, the first choice should be from dye selection.


2. If the fabric has been dyed and the light fastness does not meet the requirements, it can also be improved by additives. Appropriate auxiliaries are added during or after dyeing to cause photoreaction before the light is consumed, which consumes light energy, thereby protecting the dye molecules. Generally divided into ultraviolet absorbers and anti-UV agents, collectively referred to as light fastness improver.

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