A 2D biobased P/N-containing aggregate for boosting fire retardancy of PA6/aluminum diethylphosphinate via synergy

doi:10.1016/j.jmst.2024.03.001

Abstract

Abstract: Engineering polyamide 6 (PA6) is preferred for its superior mechanical properties, yet the intrinsic flammability restricts its industrial applications. As one of the biomass phosphorus-containing chemicals, phytic acid (PA) is favorable for its high phosphorus content and aggregation ability, making it expected to enhance the fire retardancy of PA6. Herein, a melamine-phytate aggregate (MPA) is prepared by electrostatic interaction in aqueous solution, and applied as a synergist for aluminum diethylphosphinate (ADP) in PA6. The strong synergistic effect exists between ADP and MPA towards PA6, especially when their mass ratio is 3:1 and the total loading is 18 wt%. Compared to the neat PA6, this formula allows for remarkable decreases in peak heat release rate (PHRR), total heat release (THR), and maximum average heat release rate (MARHE) by ∼ 48 %, ∼ 27 %, and ∼ 30 %, respectively, as well as a high synergistic efficiency of ∼ 43 % in PHRR. This PA6 composite also presents a V-0 rating in the vertical burning (UL-94) test and a high limiting oxygen index (LOI) of 29.7 %. This work offers an eco-friendly strategy for developing bio-based P/N fire-retardant aggregates for fabricating PA6 materials with high fire safety.

Key words: Melamine phytate aggregate, Fire-retardant PA6, Synergism, Aqueous reaction

Yixia Lu, Jiabing Feng, Tao Chu, Siqi Huo, Hongyan Xie, Zhiguang Xu, Hao Wang, Pingan Song. A 2D biobased P/N-containing aggregate for boosting fire retardancy of PA6/aluminum diethylphosphinate via synergy[J]. J. Mater. Sci. Technol., 2024, 198: 73-82.

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