The behavior of dithiocarbimate derivative as safety accelerator of natural rubber compounds

Abstract

A conventional vulcanization system containing tetrabutylammonium bis(4-methylphenyldithiocarbimato)zincate(II) (ZNIBU) was used for curing of natural rubber (NR) compounds. Rheometric (t s1 , t 90 , and CRI) and mechanical properties, such as tensile and tear strengths and modulus at 300%, were measured to evaluate the acceleration potential of ZNIBU. Commercial accelerators (TMTD, MBTS, and CBS) and a binary system CBS/ZNIBU were also tested for comparison purposes. It was observed that ZNIBU alone does not give either safe scorch time or cure rates appropriate for industrial applications. Nevertheless, mechanical properties are comparable to those given by the other accelerators used. As for the binary system, positive synergistic effects can be found in tear strength and modulus of NR vulcanizates. Besides, ZNIBU does not contribute for the formation of nitrosamines in the vulcanization process.

Synthesis, X-ray crystal structures and properties of complex salts and sterically crowded heteroleptic complexes of group 10 metal ions with aromatic sulfonyl dithiocarbimates and triphenylphosphine ligand

“…The M-S, M-P, C-S and C@N bond lengths in 1, 2, 4a and 5 are well in agreement with the previously reported dimensions for the related dithio complexes [22][23][24][25][26][27][28]. …”

“…Thus aromatic sulfonyl dithiocarbimates can be used as important scaffolds for the synthesis of complex salts and heteroleptic complexes. Despite this synthetic versatility [22,23] and the fact that various important properties have been established for the metal complexes that can be formed, scant attention has been paid to this ligand system and only recently the coordination chemistry and some of their applications have been exploited [24][25][26][27][28].…”

The preparation of multifunctional accelerators derived from tea phenols and their use in rubber compounds

“…A rubber vulcanizing accelerator is an important rubber processing aid, and the traditional rubber accelerator plays only a role in promoting rubber vulcanization cross-linking and shortening the curing time. 1,2 In the vulcanization process, the functional groups of the accelerator react during curing and form hanging side groups in the late stage of the curing reaction. [3][4][5] These hanging side groups are harmful to the properties of the rubber composites.…”

Syntheses, crystal structures and properties of sterically congested heteroleptic complexes of group 10 metal ions with p-tolylsulfonyl dithiocarbimate and 1,2-bis (diphenylphosphino) ethane

“…In the IR spectra all the three complexes display absorptions near 1435, 1216-1292, 1120 and 900 cm −1 characteristic of υ(C=N), υ asym (SO 2 ), υ sym (SO 2 ) and υ asym (CS 2 ) vibrations respectively indicating S, S coordination of the ligand dithiocarbimate with increasing importance of the canonical form I (Scheme S1 in the ESI) [20][21][22].…”

“…Complexes of the ligand aromaticsulfonyl dithiocarbimate and their possible applications have however been exploited recently [20][21][22]. This ligand has two important features (i) it may exhibit greater electron delocalization through C-S, C-N and N-SO 2 -Ar bonds and (ii) upon S, S coordination to a metal center it forms a more strained four-membered chelate ring in comparison with the five-membered ring formed with the mnt 2− complexes which in turn can influence intra and inter ligand S⋯S and M⋯S dimensions.…”