A series of flame-retardant nano-silica magnesite/fiberglass-reinforced PA6 composites were prepared using decabromodiphenyl ethane (DBDPE),inorganic nano-silica magnesite (FS21),antimony trioxide (Sb2O3) and glass fiber(GF)for the flame-retardant enhancement modification of nylon 6 (PA6).The effects of FS21 content on the flame retardancy,thermal stability,mechanical properties and processing properties of the composites were studied.The results showed that with the increase of FS21 content,the flame retardancy of the composites first improved and then decreased.When the FS21 content was increased from 0% to 2% (wt,mass fraction,the same below),the total vertical combustion time of the sample was shortened from 42.1s to 19.2s.When the FS21 content exceeded 2.4%,the flame retardancy grade of the composite dropped from V0 to V2.The LOI of the composite decreased linearly with the increase of FS21 content.The introduction of FS21 affected the mechanical properties and processing properties of the composites.
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