Nickel‐Aluminum Hydrotalcite for Improving Flame Retardancy and Smoke Suppression of Intumescent Flame Retardant Polypropylene: Preparation, Synergy, and Mechanism Study

Abstract Intumescent flame retardants (IFR) are widely used in the field of retardant polypropylene (PP), but their efficiency and smoke suppression properties need to be further improved. Herein, a Ni‐Al LDH (layered double hydroxide) is obtained successfully by coprecipitation microwave hydrothermal technique as synergist improve flame‐retardant smoke‐suppression triazine‐based IFR. The results showed that IFR/Ni‐Al exhibited best synergistic effect when IFR replaced 5 wt% LDH. 17 enabled PP composites achieve UL‐94 V‐0 rating with high LOI 29.8%. Besides, introduction effectively decreased heat release PP/IFR due its catalytic charring effect. This mainly attributed metal ions improved strength crosslinking degree char layer promoted formation cohesive dense layer. formed high‐quality exerted barrier condensed phase. Therefore, PP/IFR/Ni‐Al excellent performance. investigation provided facile way prepare environment‐friendly high‐performance wide application prospects.