The most big use of optical brighteners is on the plastics,there are so many different type of plastics exist in the word,but whatever which kind form our optical brightener can help you get the performance you want .Plastic is the most important material with synthetic or natural macromolecular compound as the basic component, which can be molded in the process, and the product can keep the same shape in the end. Most of these plastics are based on synthetic resins. Because plastic kind is various, its classification method also has a variety of, according to component property can be divided for cellulose plastics, protein plastics and synthetic resin plastics; According to the use can be divided into general plastic and engineering plastics; Thermoplastics and thermosetting plastics can be divided into two categories in terms of plasticizing and performance changes after heating. The last of these is the most common classification method.
White objects generally have a slight absorption of blue light on the short-wave side of visible light, so they often contain a yellowish color, which affects the whiteness and gives people an old and dirty feeling. The same is true for white plastics, where one of the most effective ways to eliminate the yellowish tint (often caused by certain stabilizers and other additives) is to add optical brighteners. Fluorescent whitening agent to absorb ultraviolet light, and then in the violet light emitted in the form of fluorescence, for plastic light yellow colored and violet light are complementary, and make the plastic tooth whitening, this is the principle of fluorescent whitening agent on the plastic tooth whitening effect, whitening result is to improve the whiteness of plastic, do not reduce brightness again, let a person look more white, bright beautiful, pleasing to the eye. In addition, the addition of a small amount of fluorescent whitening agent in ordinary pigments can increase the brightness of color and make the color of the shader shine. According to incomplete statistics, more than 5% of the world's output of optical brightener is used in synthetic materials such as plastics.
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