Study On Recovery Of Polystyrene Waste By The Aqueous Suspension Functional Granulation Method

Polystyrene is widely used as thermal insulation material,packaging material and sound insulation material,but polystyrene waste is difficult to degrade,which pollutes the environment and results in the resource waste.Rice cultivation is very large in Hubei province,rice husk is abundant.When rice husk is used as boiler fuel,a large amount of rice husk carbon waste is produced.If rice husk and rice husk carbon waste are not fully utilized,environmental pollution and resource waste will also be caused.Rice husk contains Si O₂and lignocellulose,and rice husk carbon contains Si O₂and carbon.Therefore,it is of great significance to study the resource utilization of polystyrene waste,rice husk and rice husk carbon waste.Polystyrene wastes,rice husk,rice husk carbon waste and graphite powder are used as raw material in this paper,so as to realize the recycling of waste and functional use of high value for the purpose.The aqueous suspension granulation process is innovatively developed to utilize the polystyrene,rice husk and rice straw waste,which is simple and easy industrialized amplification.A series of polystyrene regenerated beads,rice husk-polystyrene wood-plastic beads,rice husk carbon-polystyrene wood-plastic beads,functionalized polystyrene wood-plastic beads and graphite polystyrene composite beads are successfully prepared.The main research contents are as follows:（1）Innovative design of the water phase suspension granulation process,with polystyrene wastes and methylene chloride as oil phase,water,emulsifier and suspended dispersant calcium phosphate as the water phase,the successful preparation of a series of regeneration polystyrene beads,detailed explored the methylene chloride dosage,heating rate,dosage of emulsifier,suspended dispersant dosage of recycled polystyrene bead the influence of particle size and particle size distribution,Optimize the optimum process parameters.A series of rice husk-polystyrene wood-plastic beads and rice husk carbon-polystyrene wood-plastic beads were successfully prepared by introducing rice husk and carbon-polystyrene wood-plastic beads into the oil phase.（2）Fe₃O₄and Mg（OH）₂flame retardant are grew in situ on the surface of rice husk and rice husk carbon by the chemical coprecipitation and chemical precipitation method,by which the functionalized rice husk and rice husk carbon powder are obtained by the modification of oleic acid.Functionalized rice husk-polystyrene wood-plastic beads and functionalized rice husk carbon-polystyrene wood-plastic beads are prepared by aqueous suspension functionalized granulation process.The functionalized rice husk/rice husk carbon powder and functionalized rice husk/rice husk carbon-polystyrene wood-plastic beads are systematically characterized and analyzed by infrared spectroscopy,X-ray diffraction,contact angle test,scanning electron microscopy and thermogravimetric analysis.（3）A series of regenerated polystyrene beads are successfully prepared by using polystyrene waste and CHCl₃as oil phase,water,emulsifier,inorganic suspended dispersant calcium phosphate and organic suspended dispersant polyvinyl alcohol as water phase.The effects of heating rate,emulsifier dosage,polyvinyl alcohol dosage and stirring speed on particle size and particle size distribution of reclaimed polystyrene beads are studied in detail.In addition,a series of graphite-polystyrene composite beads are successfully prepared by aqueous suspension granulation process by introducing graphite powder and polyvinylpyrrolidone.This paper developed a process for preparing functional rice husk/rice husk carbon-polystyrene wood-plastic beads,and provides a new strategy for high value utilization of rice husk,rice husk carbon and polystyrene waste.