PROPERTIES OF VULCANIZATES COMPOUNDED FROM MODIFIED NATURAL RUBBER WITH EGG SHELL

Abstract

In this investigation eggshell (ES), a waste material was prepared as substitute in the place of the commonly used carbon black (CB). Three different samples of Natural rubber (NR) were prepared through chemical modification via deproteinization, depolymerization and epoxidation. Deproteinized Natural Rubber (DeNR) was produced by reaction with urea and sodium dodecylsulphate (SDS); Depolymerized Natural Rubber (DNR) was produced by depolymerization of natural rubber latex using nitrobenzene and Epoxidized Natural Rubber (ENR) was produced by reaction with performic acid. The NR, DeNR, DNR and ENR composites filled with carbon black and eggshell at three ratios of 100/0, 50/50 and 0/100 were prepared and labeled as mixes A to C. The physico-mechanical properties, swelling, and solubility parameters of solvents into the different vucanizates were studied.  The values for the tensile strength, modulus @ 500, elongation, hardness and abrasion increased with the addition of the eggshell into the modified NR composites with values higher than the standard (NR with CB).  However, the compression set of the NRCB vulcanizates was better than the vulcanizates of modified NR with the 100% eggshell. The vulcanizates with ES also showed less swelling rate in all the solvents used.  Keywords: Deproteinize natural rubber, Depolymerized Natural rubber, Epoxidized natural rubber, Eggshell waste, Properties, swelling.