Antioxidants are a class of chemicals that, when present in only a small amount in a polymer system, can delay or inhibit the oxidation process of the polymer, thus Prevents the aging of polymers and extends their service life, also known as “anti-aging agents”.
Antioxidants can be divided into main antioxidants, auxiliary antioxidants and metal antioxidants. Auxiliary antioxidants can be divided into phosphorus antioxidants, thioether antioxidants, and metal purifiers. Today we will take you to learn about thioether antioxidants and metal passivators among auxiliary antioxidants:
Thioether antioxidants (often called thioester antioxidants) Oxygen agent): Similar to phosphite, it also plays a role in removing hydrogen perhydride present in the polymer. It not only has the characteristics of thioester auxiliary antioxidants, but also has the characteristics of phosphite auxiliary antioxidants. This antioxidant has no odor at high temperatures and has excellent stability and weather resistance. It also has a synergistic stabilizing effect when used together with a UV light stabilizer. The most commonly used auxiliary antioxidant in industry is thiodipropionate distearate (DSTDP)
Metal deactivator: heavy metal compounds play a cocatalytic role in polymers and promote peroxide synthesis. Free radicals are formed, such as copper compounds and iron salts, which have a catalytic effect on the auto-oxidation of rubber, polypropylene, cellulose derivatives, especially polymers containing large amounts of butadiene. Accelerated aging has a great impact on the wire and cable industry. Substances that prevent heavy metal ions from oxidizing polymers are usually called metal ion passivators or metal passivators, metal chelating agents, and are also called copper inhibitors. Metal passivators have been widely used in the wire and cable industry.
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