High-Temperature and Gas-Fume Resistant Anti-Yellowing Antioxidant Series – OMNISTAB AO-80

OMNISTAB AO-80 is a member of the gas-fume resistant anti-yellowing antioxidant family. Its exceptional anti-aging performance and color stability stem from its unique molecular structure!

AO-80 is an asymmetric hindered phenolic antioxidant. Compared with traditional fully hindered phenolic antioxidants (both R1 and R2 are tert-butyl), the alkyl groups in the structure of AO-80 not only provide protection for phenolic hydroxyl groups but also reduce steric hindrance. Therefore, its ability to capture free radicals is enhanced and its anti-aging efficiency is improved.

Moreover, due to the relatively low steric hindrance around the phenolic hydroxyl groups of AO-80, the nitro substitution reaction at the intermediate position is easy to achieve, effectively solving the problem of yellowing caused by NOx gas fumigation. However, traditional symmetrical hindered phenolic antioxidants have a relatively large steric hindrance of the phenolic hydroxyl group, and nitro substitution occurs at the para position, which makes it easy to obtain p-nitro compounds with different coloration. This is why the problem of phenolic yellow is difficult to solve.

General formula of hindered phenolic antioxidant structure

Structural formula of OMNISTAB AO-80

As can be seen from the test data in the polyolefin formula below, compared with other hindered phenolic antioxidants, OMNISTAB AO-80 has excellent thermal stability. It is less likely to have the problem of fumigation yellowing under the influence of NOx, and can continuously provide excellent anti-thermal oxidation aging protection for the material during high-temperature processing and use, maintaining the initial color of the material. Significantly enhance product quality and application aesthetics.

The stability performance of OMNISTAB AO-80 in polypropylene

In addition, when OMNISTAB® AO-80 is used in combination with high-molecular sulfur antioxidants, it has an excellent synergistic effect. For instance, OMNISTAB® AN800 and OMNISTAB® AN802 can provide better heat aging resistance. OMNISTAB® AO-80 is suitable for most plastics, polyolefins and various elastomers, etc., especially for PE, PP, PA, PUR and POM.

For more information about OMNISTAB® AO-80, please feel free to contact our sales team.