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    Catalyst and Auxiliary

    According to the definition of the International Union of Pure Chemistry and Applied Chemistry (IUPAC) in 1981: a catalyst is a substance that changes the reaction rate but does not change the Gibbs free energy of the overall reaction standard. There are many types of catalysts, which can be divided into liquid catalysts and solid catalysts according to the state; and homogeneous catalysts and heterogeneous catalysts according to the phase state of the reaction system. In industrial production, auxiliary chemicals added to improve the production process, increase product quality and output, or to give products a certain specific application performance. The variety of additives is vast and their performances vary greatly. Only when used properly can the effect be prominent. "Catalyst and Auxiliary" on Echemi mainly supplies raw materials for Catalyst and Auxiliary.

    Zeolite

    Swedish mineralogist Axel Fredrik Cronstedt discovered that a type of natural aluminosilicate ore will boil when it is burnt, so it is named "zeolite". Zeolite is just one kind of molecular sieve, but zeolite is the most representative among them. There are more than 80 kinds of zeolites found in nature. The more common ones are cristobalite, chabazite, calcium zeolite, flake zeolite, sodium zeolite, mordenite, and pyrophyllite, which mainly contain calcium and sodium. "Zeolite" on Echemi mainly supplies raw materials for Zeolite.

    Polymer

    Polymers generally refer to high molecular compounds, which are referred to as macromolecules or macromolecules. They generally refer to compounds with a relative molecular mass of up to several thousand to several million. mixture. According to the source, it can be divided into two categories: natural polymers and synthetic polymers. According to the performance classification, it can be divided into three categories: plastic, rubber and fiber. ""Polymer"" on Echemi mainly supplies raw materials for Polymer.

    Fluorescent Brightener

    Fluorescent brightener is a fluorescent dye, or white dye, is also a complex organic compound. Its characteristic is that it can excite the incident light to produce fluorescence, so that the dyed substance obtains a shining effect similar to fluorite, making the substance seen by the naked eye very white. According to the chemical structure, it can be divided into five categories: stilbene type, coumarin type, pyrazoline type, benzoxazide type and phthalimide type. "Fluorescent Brightener" on Echemi mainly supplies raw materials for fluorescent brighteners.

    UV Absorbers

    UV Absorbers are currently the most widely used type of light stabilizers, which can absorb the ultraviolet light in sunlight and fluorescent light sources without changing themselves. According to its structure, it can be divided into salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines, etc. The most widely used in industry are benzophenones and benzotriazoles class. "UV Absorbers" on Echemi mainly supplies raw materials for UV Absorbers.
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