Synergism of novel thiuram disulfide and dibenzothiazyl disulfide in the vulcanization of natural rubber: curing, mechanical and aging resistance properties

Abstract

Introduction Various combinations of synthesized thiuram disulfides (TD), namely Bis (N-phenyl piperazine) thiuram disulfide (PPTD) and Bis (N-ethyl piperazine) thiuram disulfide (EPTD) with mercapto benzothiazole disulfide (MBTS) are studied in natural rubber (NR) vulcanization. At the same time, we also revised the TD-MBTS binary accelerator on the carbon black-filled NR system. An evaluation is prepared between the synthesized safe thiuram disulfides with the unsafe tetra methyl thiuram disulfide (TMTD) in the light of mechanical and aging resistance behavior to introduce non-carcinogenic rubber additives to vulcanization of rubber. Results Synthesized safe amine-based thiuram disulfides in combination with MBTS display strong synergism in the gum vulcanization. Higher concentration of thiuram disulfide in presence of MBTS (6:3 mM ratio) shows better results with respect to cure and physical properties. Conclusions In the specific concentration of 9 mM per hundred gram of rubber (6:3 mM ratio of TD to MBTS), however, PPTD-MBTS accelerated filled vulcanizates show utmost aging resistance behavior, but EPTD-MBTS accelerated filled stock spectacles show superior aging as well as mechanical properties as compared to that of TMTD-MBTS accelerated system.

Effect of natural zeolite as substrate filler on the properties of NBR/EPDM blend

“…Carbon black can be easily dispersed into the rubber matrix so that composite has high mechanical property (Jovanović et al, 2013). The high physical properties of the composite with 100% of CB filler is in accordance with the rheometer results which indicate that 100% of CB provides the highest delta torque that correlates with its mechanical properties (Alam et al, 2014). Zeolite as a substitute for filler does not provide significantly different results between 5 phr and 10 phr zeolite for tensile strength.…”

Pengaruh rasio MBTS/ZDEC pada campuran karet alam dan etilen propilen diena yang dibuat dengan teknik kontrol migrasi curatives

“…Sistem akselerator biner tersebut digunakan pada vulkanisasi karet diena dan karet butil yang berkarakteristik curing lambat (Alam et al, 2012). Akselerator jenis ini disamping mempercepat reaksi vulkanisasi te-tapi juga dapat berfungsi sebagai anti degradasi (Alam et al, 2014). Bhowmick and Mangaraj (1994)…”

“…MBTS terdekomposisi menjadi MBT dengan adanya pemanasan, selanjutnya MBT yang terbentuk bereaksi dengan ZDEC melepaskan TMTD. MBT yang terbentuk secara insitu mempunyai reaktivitas lebih tinggi daripada yang ditambahkan dari luar sistem (Alam et al, 2014). TMTD akan bereaksi dengan sulfur dan dipercepat dengan ZnO sebagai katalis.…”

Kinetic analysis of thermal degradation of NR/EPDM blends with maleic anhydride as compatibilizer: The effect of the reactive accelerators

“…The blend with good compatibility results good thermal resistance (Komalan et al, 2008;Alam et al, 2014). The anhydride groups on the MAH will give stronger bonding and can enhance the interfacial interaction between rubber-rubber and rubber-filler.…”