To investigate the combined flame retardant effects of ammonium polyphosphate and magnesium-aluminum-layered double hydroxide in EVA blends.
Formulated EVA composites with varying concentrations of ammonium polyphosphate and magnesium-aluminum-LDH.
Tested the flame retardancy and mechanical properties of the composites using UL-94 and LOI methods.
Analyzed the char formation during combustion.
The EVA composite with 8% APP and 47% MgAl-LDH achieved UL-94 V-0 rating.
Composite exhibited a limited oxygen index (LOI) of 29.3%.
Elongation at break increased by 52.8% compared to unmodified EVA.
Abstract
The EVA composite with 8% APP and 47% MgAl-LDH achieved UL-94 V-0, 29.3% LOI, and 52.8% higher elongation. APP formed a dense char layer, enhancing flame retardancy.