Improvement of the flame retardancy of papersludge/polypropylene composite

Abstract

Paper-sludge/polypropylene composites which have many merits such as low cost, disposal of industrial waste and good mechanical properties, were manufactured. For the purpose of improving flame retardancy of the composites, various kinds and contents of flame retardants like Saytex8010, TPP, Mg(OH)2 and antimony trioxide were introduced into the composites. The flame retardancy of the composites was measured with the UL94 test. Thermogravimetric analysis(TGA) of composites was performed to investigate the flame retardant mechanism. It could be believed that this composite system is mainly dominated by gas phase mechanism. Tests in flexure were used to investigate mechanical properties. The composite with Saytex8010 25 phr and antimony trioxide 15 phr showed the highest flexural strength. The flexural strength in the hybrid flame retardants system increased as the proportion of antimony trioxide increased.