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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.

    Antioxidants

    Antioxidants are substances that prevent the adverse effects of oxygen. It is a type of substance that can help capture and neutralize free radicals, thereby eliminating free radical damage to the human body. Antioxidants as food additives can help fight food spoilage. Antioxidants are usually added to industrial products. A common use is as a stabilizer for fuels and lubricants to prevent oxidation. It can also be added to gasoline to prevent polymerization and prevent the formation of engine fouling. "Antioxidants" on Echemi mainly supplies raw materials for Antioxidants.

    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.

    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.
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