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How to choose the rubber antioxidant - for a few classes of rubber

6/4/2013 8:33:41 PM

Due to the different types of rubber and vulcanization way, you need to choose a different rubberantioxidant, how to choose the rubber antioxidant - for a few classes of rubber below:

1 For NR, SBR's antioxidant

Selecting antioxidant should consider the heat resistance of the rubber, ozone resistance, flex resistance considerations, with well-sustained stability antioxidant.

2 For NBR antioxidant

NBR, the better the effect of the aging resistance to ozone cracking agent this antioxidant in NBR intersolubility, good, making it difficult to migrate to the rubber surface. Such as paraffinand can play the effect of ozone resistance. For the NBR, the use of low molecular weightparaffin is better.

3 For CR's antioxidant

Compared with NR, SBR, CR ozone resistance is very good, but long-term use of ozone cracking can also occur. In the CR, by adding a small amount of 810-NA (IPPD), 6C, DP resistance to ozone cracking aging agent, can significantly increase the resistance to ozone. Also, as the persistent heat antioxidant, CD (carbodiimide) is valid.

4 The ECO use of antioxidant

Prone to soften the aging of epichlorohydrin rubber (ECO) can effectively suppress the softeningof aging antioxidant NBC (dibutyl dithiocarbamate nickel), MB (mercapto imidazole) 224 (TMDQ). Epichlorohydrin rubber, such as excessive with the amine antioxidant, ozone resistance will decrease.

5 Antioxidant used by the ACM (acrylic rubber)

Acrylic rubber aging the aging of both hardening softening aging. Therefore, it is necessary toselect a suitable antioxidant. For hardening aging acrylic rubber, choose antioxidant CD is moreeffective, while softening aging acrylic rubber, you can choose224,6 C, antioxidant.

6 Peroxide-curedEPDM rubber used in antioxidant

Peroxide cured rubber antioxidant, generally opt for the imidazole MB, MBZ (mercaptobenzimidazolezinc salt) antioxidant in the amine antioxidant, can also choose to use the impact of cross-linking than 224, the CD for old age agent. EPDM, MB and 224 or CD antioxidant and can make rubber with excellent heat resistance. Because they have no effect in the sulfur vulcanization of rubber, so do not use this type of antioxidant.

How to choose and use rubber antioxidant

suitbaly

, it should be combined with the characteristics of rubber and rubber antioxidant characteristics .

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