Precautions:

Since the protective effect of each rubber antioxidant has limitations, and the aging of rubber products in actual use is the result of a variety of factors, the following points should be paid attention to when choosing an antioxidant:

(1) Due to the different characteristics of each antioxidant, and the aging properties of different rubber formulations are different. Therefore, the most effective antioxidant for one rubber material may be ineffective or even harmful to another rubber material. Therefore, the selection of antioxidants must be considered and reasonably selected according to the aging properties of various rubber materials, anti-aging requirements and the characteristics of various antioxidants.

(2) When one antioxidant is difficult to meet the requirements, two or more antioxidants should be used together to make them have a coordinated effect and ensure the anti-aging effect.

(3) Some antioxidants have a coloring effect and pollution on the rubber. Generally speaking, phenolic antioxidants have poor protective effect, but do not pollute or pollute very little. Amine antioxidants with higher protective effect will cause rubber pollution and serious discoloration. These contradictions should be considered in the selection process.

(4) The dosage of antioxidant should not exceed the solubility in rubber to prevent frost spray and contaminate the surface quality of rubber.

(5) Amine antioxidants have an adverse effect on rubber scorch; phenolic antioxidants can delay vulcanization, so care should be taken when selecting them.