High molecular weight HALS
As polymer applications continue to expand, low molecular weight Hindered Amine Light Stabilizers (HALS) often struggle to meet the demands of certain processing environments and high-temperature applications. High molecular weight HALS, offering better resistance to migration, volatility, and extraction, emerge as a preferable alternative due to their higher weathering standards.
Developments
In recent years, the development of high molecular weight HALS has gained traction in the global polymer additive market. While these HALS variants resist extraction and volatilization, their higher molecular weight can hinder migration within polymers. Thus impacting their light stabilizing efficiency.
The key to solving this contradiction in the application is to adjust the molecular quality of the light stabilizer to the optimal range!
After extensive research, it has been determined that maintaining the molecular weight of high molecular weight HALS within the range of 1500-3000 g/mol is optimal. This range ensures resistance to migration while maintaining excellent light stabilizing efficiency and dispersion.
Omnistab HALS with high molecular weight
Omnistab UV 3529
UV 3529 is a polymeric HALS featuring both hindered amine and triazine groups. Offering high-temperature resistance, extraction resistance, low weight loss, and effective light stabilizing efficiency. It serves as a durable light stabilizer for PP/PE and polyolefin composites. As well as other material systems with stringent weathering requirements.
Omnistab LS 3346
LS 3346 sharing a similar structure to UV 3529, is a low-volatile polymer-hindered amine light stabilizer. It exhibits excellent compatibility with most polyolefins and demonstrates a remarkable synergistic effect with other UV absorbers. LS 3346 addresses the issue of wide relative molecular mass distribution of HALS. It offers practical application value, especially for materials requiring high color and light transmittance. It finds application in polyolefin films, flat wires, fibers, plates, injection molded products, as well as materials like ABS, PS, PMMA, SAN, PVC, nylon, and polyester.
Omnistab LS 119
Due to its macromolecular structure, Omnistab LS 119 offers excellent light stabilizing properties and is suitable for polymer materials requiring low volatility and high migration resistance. It finds application in agricultural films, coatings, adhesives, soft and rigid PVC, polyurethane, polyamide fibers, and various other materials.
Omnistab LS 2020
LS 2020 boasts excellent UV resistance, thermal stability, and low volatility, along with enhanced compatibility with polymer materials. With an average molecular weight of 2600-3400 g/mol, LS 2020 maintains high permeability without compromising the color and transparency of the product. It performs well in polyolefins (PP, PE), olefin copolymers like EVA, and other engineering plastics.
FAQ
HALS are additives for polymers to protect against degradation caused by exposure to UV radiation and other environmental factors. They are crucial for maintaining the structural integrity, appearance, and performance of polymer materials over time.
Low molecular weight HALS may struggle to meet the demands of high-temperature processing environments and can exhibit issues such as migration, volatility, and susceptibility to extraction. They offer improved resistance to these challenges, making them a better alternative for applications requiring higher weathering standards.
Extensive research has shown that maintaining the molecular weight of high HALS within the range of 1500-3000 g/mol is optimal. This range ensures resistance to migration while maintaining excellent light stabilizing efficiency and dispersion within polymers.
Omnistab HALS products, such as UV 3529, LS 3346, LS 119, and LS 2020, offer unique formulations tailored to address specific challenges in polymer applications. These additives provide superior resistance to UV radiation, thermal stability, low volatility, and compatibility with a wide range of polymer materials.
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