Synergistic effects of 4A zeolite on the flame‐retardant properties and thermal stability of an efficient halogen‐free flame‐retardant EVA composite

Abstract

The synergistic effects of 4A zeolite (4A) on the thermal degradation, flame retardancy, and char formation of an efficient halogen-free flame-retardant ethylene-vinyl acetate copolymer composite (EVA/IFR) were investigated by limited oxygen index (LOI), vertical burning test (UL-94), cone calorimeter test (CCT), digital photography, scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), laser Raman spectroscopy (LRS) and thermogravimetric analytical (TGA) methods. It was found that a small amount of 4A clearly improved the LOI value of the EVA/IFR composite and reinforced the fire retardant performance with a great reduction in the combustion parameters of the EVA/IFR system from the CCT test. The entire composites passed the UL-94 V-0 rating test. The TGA and integral procedure decomposition temperature (IDPT) results showed that 4A enhanced the thermal stability of the EVA/IFR system and increased the char residue content effectively. The morphological structures observed by digital and SEM imaging revealed that 4A could promote EVA/IFR to form a more continuous and compact intumescent char layer. The LRS and EDS results demonstrated that by introduction of 4A into the EVA/IFR system, a more graphite structure was formed with increase phosphorus content in the char residue. POLYM.ENG. SCI., 56:380-387,

Asphaltenes as a tackifier for hot‐melt adhesives based on the styrene‐isoprene‐styrene block copolymer

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Ammonium Polyphosphate with High Specific Surface Area by Assembling Zeolite Imidazole Framework in EVA Resin: Significant Mechanical Properties, Migration Resistance, and Flame Retardancy

“…Generally, incorporating high-efficient synergists into an IFR system can improve its flame-retardant efficiency, thereby decreasing the required loading of IFR to meet forced mechanical and flame-retardant demand [13,14]. Among these synergists used in an IFR system, transition metal oxides, hydroxides, and salts frequently exert high efficiency due to the catalytic carbonization effect [15,16].…”

Synergistic effect of organically modified zinc aluminum layered double hydroxide in intumescent flame‐retarding polypropylene composites containing melamine phytate and dipentaerythritol

“…Nowadays, halogen‐free intumescent flame retardants (IFR) have acted as a significant role in flame‐retarding polymer materials. Compared with halogenated flame retardants, the main advantages of IFR in flame‐retarding polymer materials lie in the good anti‐dripping ability and the low releasing of toxic gases during combustion . In general, IFR system is mainly composed of three components: acid source, charring agent, and blowing agent, respectively.…”