Excellent hydrolysis resistance phosphite antioxidant

September 29, 2021
blog

Do you choose the right antioxidant to increase the heat aging resistance of materials? The Omnistab AN 9228 emerged at the right time with excellent hydrolysis resistance. The automotive market and home appliance industry have put forward higher requirements on the thermal stability of polymer materials. For example, automotive interior & exterior decoration, dishwashers, toasters and dryers. Therefore, an antioxidant with good mechanical and anti-yellowing properties under harsh conditions has become a major technical difficulty in the industry. The Omnistab AN 9228 is the right product designed to counter this.

Omnistab AN 9228

Omnistab AN 9228 is a new type of phosphite antioxidant with high molecular weight. Its appearance is free flowing white powder. AN 9228 has low volatility, high phosphorus content (7.3%) and excellent heat resistance due to its large molecular weight and molecular structure. Compared to other types of phosphite antioxidants, Omnistab AN 9228 has below advantages:

  • Excellent high temperature stability and low volatility
  • Excellent protective effect in polymers under harsh conditions
  • It gives the material protection against yellowing and degradation during high temperature processing
  • Approved by FDA and can be applied polymers that come into contact with food

Improve the heat aging performance of materials

The AN 9228 can significantly improve the thermal aging stability of the material at high temperature. Thanks to its larger molecular weight, it has a higher melting point and higher thermogravimetric temperature. So it can perform more stably and has better migration resistance.

Excellent hydrolysis resistance

Hydrolysis resistance tests have shown that AN 9228 maintains good durability and hydrolysis resistance even when exposed to condition at 85% relative humidity. AN 9228 does not exhibit coking like other phosphite additives. This prevents stains from appearing on the polymer and clogging the filter in the extrusion system.

Applications

  • In HDPE to provide excellent color and melt stability and could get a better result at lower dosage.
  • Popular in LLDPE processing due to its exceptional high temperature stability, which effectively controls LLDPE’s color and melt index during multiple extrusions.
  • Suitable for PC and other engineering plastics with high temperature process. Most phosphite additives will decompose or volatilize, but the AN 9228 not! Possible to use for temperature resistant polymers, such as PA (Nylon), polyester and polyether.

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