DIPENTAMETHYLENETHIURAM

In contrast, blended systems of Cl-butyl and SBR vulcanized with a thiuram sulfur donor, dipentamethylenethiuram tetrasulfide-DMTTS, in... 

Figure 13. Swelling in differential solvents for the system Cl-butyl, SBR 1502 dipentamethylenethiuram tetrasulfide accelerator. Sulfur donor is DMTTS.

Hydrogenation of pyridine yields piperidine, which serves as the base for the production of vulcanization accelerators, such as dipentamethylenethiuram tetra-sulfide (DPTT). 

Thiurams Thiuram mix = tetramethylthiuram disulfide, tetramethylthiuram monosulfide, tetraethylthiuram disulfide and dipentamethylenethiuram disulfide... 

The principal thiurams used industrially are tetramethylthiuram monosulfide (TMTM), tetrame-thylthiuram disulfide (TMTD), tetraethylthiuram disulfide (TETD) and dipentamethylenethiuram disulfide (PTD). These thiurams are frequently used as mixes, whose exact composition varies with the particular rubber product, as well as with the country of origin. Worldwide, TMTM and TMTD are most used. Thiurams are among the more frequently used rubber accelerators, especially in the manufacturing of gloves. Numerous other consumer products also contain thiurams (Table 6). 

Dipentamethylenethiuram disulfide Dipentamethylenethiuram tetrasulfide Dipentene (d-limonene)... 

Figure 5.15 Separation of accelerators by thin-layer chromatography. Solvent benzene - ethylacetate - acetone (100 5 1) development distance 15 cm indicators (a) 4 N hydrochloric acid (b) 0.5% ninhydrin in ethanol containing 10% acetic acid and 0.5% cadmium acetate. 1 = tetramethylthiuram monosulfide 2 = tetrabutylthiuram monosulfide 3 = tetramethylthiuram disulfide 4 = tetraethylthiuram disulfide 5 = dipentamethylenethiuram tetrasulfide 6 = cyclic thiuram 7 = piperidinium pentamethylene dithiocarbamate 8 = zinc dimethyldithiocarbamate 9 = zinc diethyldithiocarbamate 10 =...

SOME ASPECTS OF THE CROSSLINKING REACTION OF NATURAL RUBBER WITH DIPENTAMETHYLENETHIURAM TETRASULPHIDE... 

A study was made of the mechanism of the vulcanisation of NR compounds in the presence of the sulphur donor dipentamethylenethiuram tetrasulphide and in the presence or absence of zinc oxide and stearic acid. The density and distribution of crosslinks were determined, and the mechanical properties of the vulcanisates investigated. 14 refs. 

The heat stability of N,N -dipentamethylenethiuram disulphide was studied and compared with that of TMTD with respect to thiourea formation. The agent responsible for degradation was investigated and identified as alkyldithiocarbamic acid, which, upon decomposition, produced amine. The effectiveness of zinc compounds, such as ZnO and zinc bis(pentamethylenedithio-carbamate), in preventing degradation was also examined. 22 refs. 

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