CO2 utilization for ammonia removal in skim latex: Processing and rubber properties

Abstract

An innovative CO2 utilization approach for skim rubber production was developed in this research. Traditionally, skim rubber is produced using a substantial amount of concentrated sulfuric acid to coagulate the rubber particles. Before acid addition, ammonia removal process is required to reduce the volume of acid used. This process, however, involves large operating area, long processing time, environmental issues, and health hazards. To minimize those drawbacks, as a process intensification technique in this study, CO2 microbubbles were applied as a feedstock to reduce the ammonia and hence the volume of acid addition. The properties and microstructure of skim rubbers produced via CO2 microbubbles (MBSL) were investigated in comparison with those produced by traditional processes. The MBSL exhibited smooth surface texture with enhanced tensile strength and thermal stability. Utilization of CO2 as a sustainable feedstock to coagulate skim latex has a potential for not only diminishing the limitations caused by traditional processes but also highlighting an environmental-friendly and cost-effective process with improved product properties.