Natural rubber latex filler masterbatch by soap sensitised coagulation preparation processing and evaluation

Abstract

Sensitisation of natural rubber latex by addition of a small quantity of newlinean anionic surfactant prior to the addition of a coacervant results in quick newlinecoagulation The natural rubber prepared by the novel coagulation method newlineshows improved raw rubber characteristics better cure characteristics in newlinegum and carbon black filled compounds and improved mechanical newlineproperties as compared to the conventionally coagulated natural rubber newlineCompounds based on dried masterbatches prepared by the incorporation of newlinefluffy carbon black in different forms of soap sensitised natural rubber newlinelatices such as fresh latex preserved field latex centrifuged latex and a newlineblend of preserved field latex and skim latex show improved cure newlinecharacteristics and vucanizate properties as compared to an equivalent newlineconventional dry rubber fluffy carbon black based compound newlineThe latex masterbatch based vulcanizates show higher level of newlinecrosslinking and better dispersion of filler Vulcanizates based on fresh newlinenatural rubber latex dual filler masterbatches containing a blend of carbon newlineblack and silica prepared by the modified coagulation process shows very newlinegood mechanical and dynamic properties that could be correlated to a low newlinerolling resistance The carbon black silica nanoclay tri filler fresh natural newlinerubber latex masterbatch based vulcanizates show improved mechanical newlineproperties as the proportion of nanoclay increased up to 5 phr newlineThe fresh natural rubber latex based carbon black silica masterbatch newlinepolybutadiene blend vulcanizates show superior mechanical and dynamic newlineproperties as compared to the equivalent compound vulcanizates prepared newlinefrom the dry natural rubber filler polybutadiene blends newline