Standard Test Method for Rubber Compounding Materials—Determination of 2-Mercaptobenzothiazole (MBT) in Rubber

Importancia y uso:

4.1 MBT is commonly used in rubber compounding as a curing accelerator for rubber and latex products. The determination of MBT in cured rubber is important to assess the risk of a release of this hazardous substance when rubber is in prolonged contact with human skin or mucous membranes.

4.2 Neo-formed MBT from MBTS might be created during the process of vulcanization when benzothiazolesulfenamides are used in the compound as accelerators, and therefore, it is part of the total MBT content in the cured rubber.

4.3 The purity of MBT as raw material can be evaluated by following Test Method D1991 based on a potentiometric titration of MBT with sodium hydroxide.

4.4 MBT is also a major impurity in MBTS. While MBTS is sparingly soluble in any organic solvent, MBT is very soluble. The amount of MBT contained in MBTS as raw material can be determined according to Test Method D5044.

4.5 This test method may be used as a quality control tool as well as for research and development work.

Subcomité:

D11.20

Volúmen:

09.01

Número ICS:

83.040.20 (Rubber compounding ingredients)

Palabras clave:

HPLC; MBT; MBTS;