Antioxidant Masterbatch By Kandui Industries

We are engaged in manufacturing and supplying of Antioxidant Masterbatch in Vapi, Gujarat, India. After polymerization, most plastics are pelletized and shipped to compounders, polymer converters and subsequently manufacturers of the final plastic article. During this process, the polymer undergoes several processing steps which usually involves extrusion of molten polymer. Each processing step causes degradation, a result of the combined action of shear, heat and oxygen.

Thermo-oxidative degradation takes place by a free radical mechanism called autoxidation,which leads to a variety of oxidative reactions which either cause

Decrease in the molecular weight of the polymer (chain scission), or
Increase in the molecular weight of the polymer due to recombination reactions.

Both types of reactions take place simultaneously, but one or the other will predominate depending on the processing conditions, the molecular structure and the polymerization technology used to initially manufacture the polymer.

Types of Antioxidants

Primary Antioxidants:

These interrupt the primary oxidation cycle by removing the propagating radicals. Such compounds are also called Chain Breaking Antioxidants and examples include the hindered phenols and aromatic amines. Aromatic amines tend to discolour the end product and hence their use in plastics is limited. The phenolic antioxidants, however, are w