Studies on Synthesis and Characterisation of Zinc Butyl Xanthate and its Room Temperature Curing Property in Natural Rubber

Abstract

Zinc butyl xanthate [Zn(bxt)₂] was prepared in the laboratory. It was purified by reprecipitation and was characterised by infrared spectroscopy (IR), Proton Magnetic Resonance spectroscopy (H-NMR) and thermogravimetric analysis (TGA) techniques. Gum and black filled natural rubber (NR) compounds were prepared using zinc butyl xanthate alone and zinc butyl xanthate in combination with zinc diethyl dithiocarbamate (ZDC) as accelerators and were cured at room temperature. The sheets were moulded and properties such as tensile strength, tear strength, crosslink density, elongation at break, compression set, abrasion resistance etc. were evaluated. NR latex was compounded using Zn(bxt)₂/ZDC accelerator combination. It was prevulcanised at room temperature and properties like mechanical stability time (MST), pH, potassium hydroxide (KOH) number and Volatile fatty acid (VFA) number of the prevulcanised latex were measured. Sheets were prepared by casting and tensile properties were measured. The results showed that Zn(bxt)₂ and Zn(bxt)₂/ZDC combination were effective for the vulcanisation of NR and NR latex at room temperature.

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