Rubber Antioxidant MB

Product Name: 2-Mercapto benzimidazole
Molecular Formula: C7H6N2S
Molecular Weight: 150.16
Gravity: 1.40-1.44
CAS NO.: 583-39-1
Package: 25kg/bag
Storage Life: 24months

Product Details

Antioxidant MB 583-39-1 MB


Antioxidant  Chemical  Name

2-Mercapto  benzimidazole

Molecular Formula  C7H6N2S
Molecular Structure  image001.png
Molecular Weight150.16
CAS NO.  583-39-1
Storage Life24 months




White or Light Yellow

Initial M.P. ℃≥


Loss on Drying %≤


Ash %≤


Residues(150μm) % ≤


Analysis on the selection of anti-aging agents:

1. Colorability of anti-aging agents (pollution)

Amine anti - aging agents have pigmentation, which can stain rubber.They can also migrate to materials in contact with rubber, leading to contamination, which requires special attention.When exposed to heat and sunlight, it changes into a benzoquinone structure and becomes discolored.The pigmentation (contamination) of amine anti - aging agents is different.

2. Heating and reducing the amount of anti-aging agent

Given the stability of an anti-aging agent, it is important to understand its own heating reduction (volatility).In similar compounds, the larger the molecular weight, the smaller the heating reduction, CD(carbonized diimine) and white aging inhibitor is difficult to volatilize even at high temperature.Therefore, it has good stability.

3. Residues of anti-aging agent in rubber

The amount of anti - aging agent added to rubber is gradually reduced by evaporation and oxidation.6C is oxidized into benzoquinone structure.It has recently been reported that the benzoquinone structure is restored to its original structure by the reaction of heat and rubber.


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