Study And Preparation Of Non-toxic And Environmentally Friendly Composite Of Waste PS/biomass

In this research subject,bio-fiber was taken as the filler and was added into waste polystyrene(PS)resin to prepare waste PS/bio-composite.It reviewed the variety and dosage of bio-fiber and the influence of elastomer on waste PS/bio-fiber.Meanwhile,in order to solve the problem of poor compatibility between waste PS resin and bio-fiber,the compatilizer suitable for this system was prepare independently in this paper.Firstly,the waste PS/bio-fiber composite was prepared.Through comparatively analyzing on mechanical property and processing fluidity performance,the variety and dosage of bio-fiber was optimized.The result showed that the waste PS/bio-fiber system prepared by reed fiber had better mechanical property than that of system prepared by peanut shell or straw.When adding 30 pieces of reed fiber,the waste PS/bio-fiber material had better mechanical property and melting flow performance.Three kinds of the waste PS/reed systems were prepared by using mold pressing,extrusion and injection respectively.The different influences of three kinds of processing methods on performance of three systems were discussed.The result was that the mechanical property and the fluidity performance of the system prepared by injection molding was better than those of the other two molding methods.Secondly,aiming at the waste PS/reed system,two kinds of compatilizers were prepared in the paper.One was named as reed-g-St which connected styrene with reed fiber by stem grafting through solution grafting method.The other one was named as St-KH570 which was prepared by taking silane coupling agent KH570 and styrene as the monomers of polymerization reaction and BPO as the initiator through copolymerization.These two kinds of compatilizers were characterized through infrared spectrometer.The three-factor and four-level orthogonal test was selected to study the synthetic process of the compatilizer St-KH570.The synthetic process conditions were determined.The reaction temperature was 85?,the dosage of BPO was 6g and the matching ratio of styrene and KH570 dosage was 1:1.These two compatilizers were added into the waste PS/reed system respectively.And the effect of these two compatilizers on mechanical property and thermal stability was compared.The result demonstrated that the waste PS/reed system added with St-KH570 reaction-type compatilizer had better mechanical property and thermal stability.In order to overcome the weakness of large brittleness of waste PS/reed system,the elastomers SEBS and EPDM were added into the waste PS/reed system,respectively.And the effect of these two elastomers on mechanical property and thermal stability of the waste PS/bio-fiber system was compared.The result showed that after adding the elastomers SEBS or EPDM,the impact strength of the waste PS/reed system rise by 36.1%and 6.56%respectively,and the elastomer SEBS had larger toughness contribution to the waste PS/reed fiber system.Compared with the waste PS/reed/EPDM composite,the maximal decomposition temperature of the waste PS/reed/SEBS composite increased by 2.57%.Carbon residual rate at temperature of 500? increased by 108.88%.The maximal decomposition rate decreased by 0.1%/?,which showed that it was more favorable for SEBS to keep thermal stability of the waste PS/reed system.The effects of adding compatilizer and elastomer into the waste PS/reed system are compared.The result showed the waste PS/reed/SEBS/St-KH570 system had better mechanical property and high-temperature stability.The rheological property of optimized waste PS/reed/SEBS/St-KH570 composite was studied.And its change of processing performance was discussed.The result demonstrated that the waste PS/reed/SEBS/St-KH570 system was in non-Newtonian fluid on the whole.Its flow activation energy E? had big influence on the shearing rate.And the activation energy was obviously improved.Finally,the antibacterial activity of the waste PS/reed/SEBS/St-KH570 was inspected.Its actual application was expanded to prepare the waste PS/bio-fiber composite with non-toxicity,environmental protection,low price and good application in building,decoration and other fields.The result showed the waste PS/reed/SEBS/St-KH570 system had stronger biological antibacterial ability compared with the blank sample..