Abstract
Ebonite is generally made by vulcanising crude rubber to which has been added 3040% of sulphur with accelerators, zinc oxide, ebonite powder, etc. On obtaining ebonite directly from latex, there have been made only a few studies. The authors have made ebonite directly from latex and made studies on the influence of accelerators seen in this case. Natural latex with high percentage of sulphur added gives, when valcanised, ebonite as solid rubber similarly treated. Quick vulcanisation is also possible, if an ultra-accelerator is used. The authors describe their fundamental studies on (atex-ebonite). They added several types of marketsold organic accelerator and various percentage of sulphur to latex, and, on vulcanisation, have determined tensile strength, elongation, hardness and electric resistance of the vulcanisates. Further, comparative studies were made on the vulcanising characteristics of organic accelerators, on quantitatively analysing the combined sulphur. The result obtained show that Zn diethyl dithiocarbamate, Zn dibutyldithiocarbamate and tetramethylthiuram disulphide have all a similar effect, while Zn ethylphenyl dithiocarbamate has a slower effect than these.
