What are some common antidegradants?

on page 7 lists some common antidegradants and their characteristics. Examples of amine antioxidants are AKROCHEM® A.O. S and PANA. Certain amines and amine derivatives were the first chemical antidegradants to be used in rubber and are still some of the most common types of antidegradants used by the rubber industry.

Can anti-degradants reduce oxidation & ozonation of rubber?

The oxidation/ozonation of rubber can be slowed down considerably by the addition of anti-degradants. These are chemicals that scavenge and neutralize “oxy” radicals before they have a chance to auto-catalyze the polymer.

Are antidegradants discoloring?

An antidegradant is considered to be discoloring if it is compounded into rubber compound and it causes a significant change in the color of the cured rubber article. Some antidegradants are discoloring as well as staining.

What antioxidants can a rubber compounder use?

A rubber compounder can use an amine antioxidant (i.e. A.O. S) to eliminate peroxide radicals and a phosphite antioxidant (i.e. A.O. TNPP) to eliminate hydroperoxide radicals in the same compound. In this example, A.O. TNPP will also provide protection against metal poisoning. on the next page.

Are antidegradants antiozonants?

As a group these antidegradants are considered to be antiozonants. Most offer protection against oxygen as well. They are highly effective peroxide radical scavengers and provide outstanding flex-cracking resistance. They are more effective than phenolics. Typical loading is 0.5 to 4.0 phr.

Are antidegradants more effective than phenolics?

Higher molecular weight products are less volatile. As a group these antidegradants are considered to be antiozonants. Most offer protection against oxygen as well. They are highly effective peroxide radical scavengers and provide outstanding flex-cracking resistance. They are more effective than phenolics.