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Antioxidant Masterbatch

Antioxidant Masterbatch

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Description
Why use Anti Oxidant masterbatches?
Plastics generally ages rapidly under the effects of light, oxygen and heat leading to :
  • Loss of strength, stiffness of flexibility
  • Discoloration
  • Scratching and loss of gloss
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 widely used in polymers. Careful selection of the phenolic antioxidant is required as the oxidation products of some phenols may discolour the polymer. The formation of chromophores is directly related to the structure of the phenol and discolouration can therefore be minimized by choosing a phenolic with a specific structure together with the use of suitable co-stabilizers.

Secondary Antioxidants :
These compounds are also called Preventative Antioxidants as they interrupt the oxidative cycle by preventing or inhibiting the formation of free radicals. The most important preventive mechanism is the hydroperoxide decomposition where the hydroperoxides are transformed into non-radical, nonreactive and thermally stable products
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Antioxidant Masterbatch
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