Aspirational antioxidants should have the following conditions:

①Should have high anti-oxidation ability;

②Good compatibility with resin, no precipitation;

③Good processing function, non-volatile and non-decomposing at the processing temperature of high polymer;

④Good resistance to extraction, insoluble in water and oil;

⑤The color of itself is best to be colorless or light-colored, so as not to pollute the product;

⑥Non-toxic or low-toxic;

⑦Low price.

In fact, any kind of antioxidant can not fully meet these conditions. Therefore, in actual application, it is often based on the variety, use and processing method of engineering plastics, using the strengths of various additives and cooperating to produce synergistic effects.