Di-o-Tolylguanidine DOTG

Air Products and Chemicals Prochimie International Sovereign Chemical R. T. Vanderbilt 

DOTG is primarily used as a secondary accelerator or kicker with sulfenamide or thiazole primary accelerators. It is not as chemically active as the thiuram or dithio-carbamate secondary accelerators. DOTG has a little more scorch safety than DPG. 

---

SYNS DIORTHOTOLYLGUANIDINE 1,3-DI-o-TOLYLGUANIDINE DOTG ACCELERATOR USAF A-6598 VULKACIT DOTG/C... 

Most accelerators for accelerated-sulfur vulcanization do not work for the metal oxide vulcanization of neoprene rubbers. An exception to this is in the use of the so-called mixed curing system for CR, in which metal oxide vulcanization is combined with accelerated-sulfur vulcanization. In this case, along with the metal oxides, accelerators such as tetram-ethylthiuram disulfide(TMTD) or N,N -di-o-tolylguanidine (DOTG) are used with sulfur. This may be desirable for high resihence or for good dimensional stability. 

There are no known practical peroxide cure systems for the PO—AGE polymers. Apparentiy the peroxide attacks the polymer backbone at a rate that is unfavorably competitive with the cross-linking rate. A typical sulfur cure system consists of zinc oxide [1314-13-2] tetramethylthiuram mono sulfide (TMTM), 2-2-mercaptobenzothiazole [149-30-4] (MBT), and sulfur. A sulfur donor cure system is zinc oxide, di-o-tolylguanidine [97-39-2] (DOTG) and tetramethylthiuram hexasulftde. 

Fig. 2.29. Py-FIMS spectrum of 1,3-di-o-tolylguanidine (Vulkacit DOTG, Bayer AG) at Tinax = 563 K relative intensity in % of the sum of all heights of the recorded peaks in the mass spectrum taken as 100). After Hummel et al [699]. Reprinted from D. Hummel et al, MakromoL Chem., Rapid Commun. 3, 335-341 (1982). Copyright 1982 Wiley-VCH.

---