A novel household fill material fabricated from waste peanut shells and polyurethane with flame retardant and antibacterial functions

Abstract

Velike količine ljuski kikirikija odbacivale su se svake godine u Kini i spaljivale ili odlagale na odlagališta otpada, čime se nije samo zagađivao okoliš, već su to bila i neiskorištena prirodna bogatstva. Zato je izrađen materijal za ispunu s funkcijama protiv gorenja i antibakterijskim svojstvima od nezbrinutih ljuski kikirikija i nezbrinutog termoplastičnog poliuretana primjenom plastifikacije, miješanja i vrućeg prešanja. Glavni faktori koji utječu na učinak sredstva protiv gorenja i regresijski model graničnog indeksa kisika dobiveni su analizom odzivne površine. Regresijski model pomogao je u predviđanju sposobnosti sredstva protiv gorenja i postizanju optimalnog uvjeta pripreme koji su sljedeći: maseni udio ljuski kikirikija 49,5%, maseni udio amonijevog fosfata 4,4 %, maseni udio sredstva protiv gorenja od termoplastičnog poliuretana (TPU) 14,2 %, i u tim uvjetima granični indeks kisika materijala bio je 32,78 %. Nakon dodatka 3 % viskera tetraigličastih ZnO u istim uvjetima, granični indeks kisika bio je 32,7 %, a antimikrobni stupanj Staphylococcus aureus, Escherichia coli i Salmonelle iznosio je 96,03, 96,98 odn. 92,33 %.Large amounts of peanut shells were abandoned each year in China and the abandoned peanut shells were subjected to incineration or landfill, which not only polluted environment, but also wasted resources. So, a household fill material with flame retardant and antibacterial functions was fabricated with abandoned peanut shell and discarded thermoplastic polyurethane by plasticizing, blending and hot pressing. The main factors that affect the flame retardant performance and the regression model of limiting oxygen index were obtained by response surface analysis. The regression model helped to predict materials flame retardant ability and achieve the optimal preparation condition, which as follows: the peanut shell mass fraction 49.5 %, ammonium polyphosphate mass fraction 4.4%, Thermoplastic polyurethanes (TPU) flame retardants mass fraction 14.2 %, under these conditions, the limiting oxygen index of materials was 32.78 %. While after added 3wt% Tetra-needle like ZnO whiskers at the same condition, the limiting oxygen index was 32.7 %, and the antimicrobial ratio of staphylococcus aureus, escherichia coli and salmonella reached 96.03, 96.98 and 92.33 % respectively

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