What is fluorescent brightener

Fluorescent brighteners are actually optical effects, so they are often called opticalbrightens, which are different from chemical bleaching. Chemical bleach discolors the colored impurities in the substrate by oxidation or reduction. The essence of the bleach is that the chemical bond (usually unsaturated bond) in the impurity molecule is broken into a small colorless molecule by oxidation or becomes saturated bond by reduction, so that more or less will affect the performance of the matrix; The whitening of fluorescent brightener is a pure optical effect, which will not affect the properties of the substrate.

 

Therefore, the whitening and chemical bleaching of fluorescent brighteners are two different mechanisms, which complement each other but cannot be replaced. For example, it is an important process to improve the whiteness of fabrics in the textile industry. The whiteness of fabrics can be improved by physical or chemical methods: bleaching belongs to chemical method, and fluorescent whitening agent whitening belongs to physical method. The bleach commonly used in chemical bleaching includes sodium hypochlorite, hydrogen peroxide, potassium permanganate or sulfide. The first three are strong oxidants, the latter is reducing agent. The impurities in the fabric fibers are removed by oxidation or reduction, which makes them have high whiteness. The disadvantage is that the strength of fiber is damaged while bleaching. Fluorescent brightener is not true white, nor bleaching, but optical brightening and toning. The bleached fabric is treated with fluorescent brightener to make it brighter. The substrate treated with fluorescent brightener looks more dazzling in the sun than in incandescent lamps because there are few ultraviolet light components in incandescent lamps.

 

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