UV Stabilisers & Absorbers
Protection against the detrimental effects of U.V. & I.R. radiation.
|Astra Product Code||Astra Internal Reference Description|
|A-3000||PE HALS UVS additive masterbatch|
|A-3001||PE HALS UVS additive masterbatch|
|A-3007||PE HALS UVS/UVA additive masterbatch|
|A-3008||PE HALS UVS/UVA additive masterbatch||A-3020||Green HALS UVS/UVA additive masterbatch|
|A-3025||PE HALS UVS additive masterbatch|
|A-3116||Green HALS UVS/UVA additive masterbatch|
|A-3138||Infra Red absorber additive masterbatch|
|A-3150||NiQ greenhouse UVS/UVA additive masterbatch|
Ultra Violet radiation is destructive to polymeric materials so the choice of an appropriate and efficient UV package is critical to ensure good performance and longevity of the polymer.
Astra Polymers have over twenty years experience in this complex area, producing highly concentrated and end application specific formulations. All polymer types are considered from olefins through styrenics to ETPs.
Careful selection of hindered amines and conjugated ring systems ensures the best possible performance and co-inclusions of antioxidants further enhance the stabilisation package.
Application Examples Tapes, Fibres, Geotextiles, Films, Extrusions and Injection Mouldings.
- UV absorber and stabiliser masterbatches
- Tailored UV resistance to meet end use requirements
- Complete range of UV technologies
- Fibre, film and moulding applications
The first UV protection of polymers was offered through the use of UV absorbers. These are conjugated organic systems which "absorb" UV radiation due to the double bonds within the molecules absorbing light energy in the UV region and re-emitting it in the IR region. Such compounds include benzophenones and benzotriazoles.
UV absorbers are only really effective in thicker sections as the thicker the section then the greater the chance of the light energy falling on an absorber molecule rather than a polymer molecule. Also relatively large amounts of absorber have to be added to the polymer to ensure there is enough present to scavenge all of the light energy that falls onto the polymer substrate.
These systems have the advantage that they can be used to protect whatever is being covered or packaged by the treated polymer as well as the polymer itself.
The most effective and important stabilisers are the hindered amine light stabilisers, the so called HALS. Rather than simply absorbing the light energy these work by interrupting the photodegradation process before it can get destructively underway. The mechanisms used include "free radical scavenging", "peroxide decomposition" as well as a little energy absorption.