Name | Fluorescent Brightener 33 |
Synonyms | fluorescent brightener 33 Fluorescent Brightener 33 C.I.FluorescentBrightener33 Fluorescent brightening agent 33 |
CAS | 61902-19-0 |
EINECS | 205-071-3 |
Storage Condition | Room Temprature |
fluorescent whitening agent | fluorescent whitening agent is a fluorescent dye, or white dye. Its characteristic is that it can convert ultraviolet light into blue, blue-purple or red visible light, produce optical whitening effect, and produce fluorescence due to the excitation of the incoming light, so that the dyed substance can obtain a sparkling effect similar to fluorite. The function of fluorescent whitening agent is to significantly improve the whiteness of the paper and make it radiant and pleasing to the eye, which cannot be achieved by any chemical bleaching agent. For this reason, fluorescent whitening agent is widely used in the whitening treatment of high-grade paper. The use of fluorescent whitening agent can improve the whiteness of paper, but not instead of bleaching, but to make the paper with considerable whiteness continue to improve its whiteness, so it is mainly used for paper with high whiteness requirements, such as offset printing paper, painting newspaper, advanced writing paper, typewriting paper, etc. fluorescent whitening agent is a complex organic compound, there are many kinds. These substances have conjugated double bonds, which can absorb ultraviolet light and reflect visible light waves with longer wavelengths. There are five main types of fluorescent brighteners according to their chemical structure. (1) fluorescent whitening agent 33 belongs to stilbene type fluorescent whitening agent, which is the largest variety and quantity of fluorescent whitening agent. it is mainly used in cotton fiber, paper and detergent industries. for example, fluorescent whitening agent DMS (C.I. fluorescent whitening agent 260) has blue fluorescence. (2) Coumarin type. It has the basic structure of coumarone, is used for whitening wool, silk and nylon fabrics, and is also used in the plastic industry, such as fluorescent whitening agent WS (C. I. fluorescent whitening agent 52) has blue violet fluorescence. (3) pyrazoline type. Used for whitening wool, nylon and acrylic fibers, such as fluorescent whitening agent WG (C. I. fluorescent whitening agent 54) has green blue fluorescence. (4) Benzo-azole type. Used in polyester, nylon and other fiber and plastic industries, such as fluorescent whitening agent DT (C.I. fluorescent whitening agent 135) has red and blue fluorescence. (5) Naphthalene dimethyl imide type. Used for polyester, acrylic, nylon and other fibers, such as fluorescent whitening agent AT (c. I. fluorescent whitening agent 162) with blue fluorescence. the following is a brief list of the structural formulas of several fluorescent whitening agents: fig. 1 is the chemical structural formula of fluorescent whitening agent BA, fluorescent whitening agent DT and fluorescent whitening agent. |