These results indicate that the electrical resistivity increases with addition of 2-mercaptobenzimidazole, 2- mercaptobenzothiazole, and thioglycolic acid.
The effects of 3 mL/L of 2- mercaptobenzimidazole (Fig 5), 2 mL/L of 2- mercaptobenzothiazole (Fig 6), and, 4 mL/L of thioglycolic acid (Fig 7) were evaluated.
Therefore, allergic contact dermatitis associated with accelerators such as dithiocarbamates, thiurams or mercaptobenzothiazole
can be avoided.
Cure systems with primary accelerators such as mercaptobenzothiazole disulfide (MBTS) or sulfenamides such as tert-Butyl-2-benzothiazole sulfenamide (TBBS) have been used to address such requirements.
Such molecules are effective secondary accelerators for zinc mercaptobenzothiazole, and the compounds can show resistance to copper staining and improved ozone resistance of natural rubber latex film.
Compound 1 is a gum formula containing the natural rubber grade of interest, 6.0 phr zinc oxide, 0.5 phr stearic acid and a conventional cure system consisting on 0.5 phr mercaptobenzothiazole (MBT) and 3.5 phr sulfur.
22 and 30) Compound 1 2 Natural rubber 100.00 100.00 N330 carbon black 35.00 Zinc oxide 6.00 5.00 Stearic acid 0.50 0.50 Sulfur 3.50 2.25 Mercaptobenzothiazole (MBT) 0.50 0.70 Table 11--representative data for model natural rubber gum compound (ref.
Identification Annual consumption SRMs SRM 370 Zinc oxide 0 SRM 371 Sulfur 64 units SRM 372 Stearic acid 109 units SRM 376 Magnesium oxide 0 SRM 378 Carbon black, HAF 0 SRM 382 Carbon black, SRF 0 SRM 383 Mercaptobenzothiazole
(MBT) 10 RM 8384 N-tert-butyl-2-benzothiazolesulfenamide 56 units IRMs IRM 001a Tetramethylthiuram disulfide (TMTD) 0 IRM 002b Benzothiazyl disulfide (MBTS) 55 lb.
* Special-concern chemicals, such as nitrosamines, mercaptobenzothiazoles
, and polynuclear aromatics (PNAs).
The company's sulphide collectors include xanthates, thiocarbamates, mercaptobenzothiazoles, mercaptans, dithiophosphates, dithiocarbamates and tailored reagents, while its non-sulphide collectors include fatty acids, ether amines, ether diamines, fatty amines, sulphosuccinamates and modified fatty acids.
The Senkol collector range includes mercaptobenzothiazoles, dithiocarbamates, dithiophosphates, thionocarbamates, and xanthic esters as well as various blends of these chemicals.