The Plastic Antioxidants market is divided into phenols, phosphites and phosphonites, antioxidant mixtures, polyethylene, polypropylene, polyvinyl chloride, polystyrene, acrylonitrile butadiene styrene, etc.
Almost all polymer materials undergo oxidation reactions. Oxidation may occur at every stage of the polymer life cycle, namely during the manufacturing and storage of the material or during processing and final use.
Antioxidants are added to plastics to inhibit degradation caused by thermomechanical or thermooxidative conditions. Antioxidants can extend the life of the product, enhance the appearance and maintain its strength, rigidity and flexibility. The way these antioxidants interrupt the degradation process differs depending on their structure. Several amines, phenols, phosphites, thioesters, etc. are used as Plastic Antioxidants.
Main plastic antioxidants:
The importance of antioxidant additives in the plastics industry
Antioxidant polymer additives are essential because they help prevent a process called oxidation. By doing so, they can stabilize the quality of plastic products and slow down the degradation process.
But this is not all. Plastics are still susceptible to oxidation after manufacturing. Some plastics are more fragile than others, but oxidation can have a negative impact on the external quality and life cycle of the product. An antioxidant masterbatch can help curb harmful oxidation processes.
Plastic products most commonly containing antioxidant additives include:
● Various pipes and fittings used in construction and construction industry
● Polyethylene film (PE film) is used in various applications, from construction to food packaging
● Products and films made of polypropylene (PP)
Types of Plastic Antioxidants
There are two main types of antioxidants used in plastics:
Main antioxidants: Known as "chain scission antioxidants", they are free radical scavengers that can remove alkyl radicals generated when polymer chains are destroyed at high temperature and hydroxyl radicals generated by abstract hydrogen; examples include hindered phenols;
Secondary antioxidants: They can remove the organic hydroperoxides formed when the primary antioxidants scavenge free radicals. If it is not removed, the hydroperoxide will cause a new free radical reaction. Examples include phosphites and thioethers;
Usually, a mixture of primary and secondary antioxidants work together to achieve a superior process. In injection molding, phosphite stabilizes the plastic during the melting process, while sulfide is an ideal choice for plastics that are often heated during use.