Antioxidant Masterbatches

Plastics are susceptible to thermo oxidative degradation during process and usage. This may be because of higher temperatures, high shear rates or under the effects of light & oxygen. This will cause:

1. Loss of strength.
2. Loss in elongation
3. Surface may become rough and less glossy
4. Color fading or discoloration

Oxidation is a chain reaction process involving free radical and hydroperoxide intermediates. Antioxidants decompose the free radicals by chemical reaction. Polymer manufacturers add antioxidant in certain polymer grades but this will not be sufficient to withstand number of processing cycles, higher shear or temperature. This results in degradation of polymer thereby deteriorating mechanical properties.

Different families of antioxidants are reactive with different intermediates in the oxidation process.

Different types of Antioxidants:

There are two types of antioxidant and they are as follow:

1. Primary Antioxidant

Primary Antioxidants such as hindered phenols interrupt the primary oxidation cycle by removing the propagating radicals. Aromatic amines tend to discolour the end product and hence their use in plastics is limited. Phenolic antioxidants are commonly used in most of the polymers. Phenolic antioxidants protect plastics or other polymers against degradation and oxidation at high processing temperatures.

2. Secondary Antioxidant

These type of Antioxidants stops degradation by preventing the generation of free radicals. Any biproducts produced by the hydroperoxide decomposition are transferred in to non-reactive thermally stable products. Commonly used secondary Antioxidants having either Phosphites or phosphonite groups or Organic Sulphur containing compounds and dithiophosphonates are widely used.

Selection of Antioxidants depends on a number of factors.
1. Base polymer,
2. Extrusion temperature
3. Performance targets for the end product.

The Efficiency of an antioxidant n polymers is determined by three processes: the chemical reactivity, the physical loss and a minimal effective concentration. Uniformity and dispersion depends upon processing and also the ability of the additive to reach the polymer’s attacked sites by diffusing through the viscous melt. Combination of antioxidant additives are always preferred for protection at different levels of processing and even in service life.

Antioxidant Masterbatches help you combat the degradation of plastic due do oxygen and heat. The antioxidant systems suitable for various polymers are selected considering the end applications. For example Antioxidants added in agricultural films to improve thermal stability, prevents discoloration and maintains transparency.

Kandui’s experienced team has developed antioxidant formulations offering combination products that not only provide in-process stabilisation but also enhance lifetime performance.

Processes:

Blow Moulding
Roto Moulding
Injection Moulding
Blown Film – Mono layer / Multi Layer
Extrusion / Co- Extrusion / Lamination
BOPP Films
BOPET Films
Cast Films
TQ Films
Sheet Extrusion
Thermoforming
Extrusion Coating / Lamination
Mono Filament / Multifilament
Raffia
Non-Woven
PET Strap
Polyester Staple Fiber
Recycled POY/PSF
Spinning BCF
Spinning FDY/POY
Spinning LOY
Extrusion Cables
Extrusion – Pipe & Fittings
Reprocess

End Products:

Drum
Jerry Cans / Bottles
Mineral Water Jar
Preforms
Tanks
Pallets
Automotive Parts
Road Barriers
Toys
Waste bins / Dust bins
Electric Housing / Electronic Housing
Furniture & Household Goods
Luggage
Stationary
Medical Components
Caps
Cutlery
Films
Carry Bags / Shopping Bags / Garbage Bags
Paint Pales
Cross Laminated Tarpaulins
PET Film / Sheet
PS / HIPS Sheet
PC Sheet
Agricultural Films / Nets
Packaging
Sun Control Films
Wrappers
Breathable Films
Non Breathable Films
Garments
Packaging
Disposables
Tarpaulin
Raffia Lamination
Bristles
Jumbo Bags
Diapers
Straps for Wrapping Boxes/Cartons/Bale Covers
Grey & Dyed Fabric
Cloth / Textile Grade Yarn
Jelly Filled Telephone Cable
Optical Fiber Cable
Transmission Cables
HDPE Pipe & Fittings
PPR Pipe & Fittings
Drip Pipes
PS/HIPS Sheet
BOPP/BOPET Lamination
Paper Cups
Corrugated Boxes
Fishing Nets
Mats
Belts / Niwar
Woven Bags (Cement/Fertilizer/Leno)
Wipes
Industrial Yarn
Home Furnishing
Bath Rugs/Mats
Sportswear / Winterwear
PPE (Mask, Suits, Cap etc)
Medical usage fabric
Sewing Threads
Textiles
Under-garments
Sportswear
Knitted fabrics
Carpets
Pipes

We welcome you to please speak to our Marketing representatives for your specific requirements. We will be more than happy to cater to your needs.

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