Does natural rubber have antidegradants?

Natural rubber already contains naturally occurring antioxidants that protect the polymer from oxidation. One of the key properties of antidegradants (antioxidants and /or antiozonants) is their solubility in the rubber matrix. The faster the rate of bloom, the less soluble the antidegradant is in the polymer system.

What factors affect antidegradants availability and consumption in rubber?

to its consumption in rubber. IV. Factors affecting antidegradants availability and consumption Protection of rubber goods by anti-degradants starts from the moment the antidegradant is mixed into the uncured rubber compound and finishes when the last trace of active antidegradant has dis-appeared from the used compound.

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.

Are antidegradants contradictory?

Antidegradants are contradictory in their very nature. The production of tire or any other in-dustrial rubber article involves several processing steps. All ingredients are mixed into the polymer, and then the rubber compound is given a certain shape by calendaring, extrusion and/or molding.

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.