Fluorescent whitening agent, also known as optical brightener, short for whitening agent, is a fluorescent dye that emits fluorescence under ultraviolet light. It is mainly used in the textile printing and dyeing industry to improve the whiteness of various natural and synthetic fiber fabrics and To enhance gloss, the application in papermaking, plastics, leather, soap, synthetic detergent and other daily necessities industries has also grown rapidly in recent years. Its characteristic is that it can convert ultraviolet light into blue, blue-violet or red visible light, produce optical whitening effect, and produce fluorescence due to the excitation of incident light, so that the dyed substance obtains a sparkling color similar to fluorite. effect. The role of fluorescent whitening agents is to significantly improve the whiteness of paper and make it pleasing to the eye, which is beyond the reach of any chemical bleaching agent. Therefore, fluorescent whitening agents are widely used in the whitening treatment of high-grade paper. Fluorescent chemicalbook whitening agent is an organic substance that can improve the whiteness of fiber fabrics and paper. The brightener can absorb ultraviolet light with a wavelength of 330-360 nanometers, and the reflected light wavelength is blue-violet light with a wavelength of 400-440 nanometers, which is complementary to the yellow light originally reflected by the fabric that is still yellowed after bleaching. Adding to white makes the fabric white. After whitening treatment, part of the ultraviolet light is also converted into visible light and reflected, and the total amount of reflection is higher than that without treatment, so the brightness of the treated fabric is also increased, making white fabrics whiter and colored fabrics brighter. Fluorescent whitening is different from chemical bleaching, and will not damage the color and strength of fabrics, but for fabrics and papers with dark backgrounds, if they are directly treated with brighteners without bleaching, good results cannot be obtained.
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