Most of the polymers are susceptible to oxidative degradation either during processing – especially at elevated temperature employed for higher outputs AND during the long term service lifetime of finished products.
Most of the polymers are susceptible to oxidative degradation either during processing – especially at elevated temperature employed for higher outputs AND during the long term service lifetime of finished products.
Though antioxidants are added to the resin by resin producers, these are consumable in nature and thus get depleted with repeated heat histories which the polymer undergoes eg. during recycling and reprocessing. Thus Anti oxidant masterbatch help to replenish the reservoir of stabilizers to prevent product discolouration and failure during service. Thus whether the objective of adding recycled content is for sustainability or economics anti oxidant masterbatches are critical for ensure the product meet the expectations of end users.
Antioxidant masterbatches are combinations of primary antioxidants which are usually phenolic and secondary antioxidants such as phosphites or thioesters and as a combination prevent thermos-oxidative degradation of polymers during both melt processing and service lifetime.
Some of the common applications are blown and cast films of LDPE, LLDPE such as mulch films, green house films, reprocessed granules, rotational moulded items, HDPE pipes etc. Anti Oxidant masterbatch can increase the OIT for HDPE pipes in critical applications.
