Optical brightener for textile textile dyes

For the textile industry, white fabrics often require very high whiteness. Sometimes it is also necessary to have bluish light, the pink roses differ after chemical bleaching processes, normally the whiteness is only 85% compared to the standard 100% whiteness. Felt brownish yellow, giving the fabric a milky luster. In order to eliminate the above colors and improve the whiteness to customers’ requirements, it is absolutely necessary to use an optical brightener. (fluorescent whiterning ageint-fwa)
Nature of optical brightening process:
Conventional white materials do not have fwa yet because they contain some natural substances so they have the ability to adsorb some light rays in the blue region of the visible light spectrum (white light). The reflected light from the object reflecting on the human eye will lack that blue light and the feeling will give us a yellowish material.
an absolute white object must be able to completely reflect the rays (of white light) hitting them, or in other words, the reflected light must have no part in the change of the rays in the range. The whole spectrum is visible.
In the past, people still used the method of ignoring the white yarn with solutions of blue or pink dye, the dyed blue light would compensate for the lack of blue light that the fabric had absorbed. The result is that the human eye will feel whiter because the yellowish feeling has been neutralized. However, this method has some disadvantages that it does not work well, is not durable with light, and with washing. reduce the brightness of white fabrics because when blue dye materials absorb more light, the total amount of reflected light is reduced.
In recent years, to bring whiteness to the product, people have produced an optical brightener. This is a neutral organic compound. It is light yellow in color and has an affinity for fibers. The distinctive feature of fwa is that they have a chemical structure that is suitable for fiber. at the same time, it must be able to absorb light rays in the uv region with n = 300-380 nm. It can generate violet to red rays with r = 430-435nm. Or violet blue rays with r = 435-440nm. Felt yellow and gives the product an absolute whiteness. However, this effect is only shown under sunlight or artificial light similar to white light. use (concentration, treatment conditions, white substrate, etc.).

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