Affiliation:
1. Research Institute of Wood Industry Chinese Academy of Forestry Beijing China
2. Dehua TB New Decoration Material Co., Ltd Huzhou China
Abstract
AbstractA tetrakis (melamine)‐1‐hydroxyethylidene‐1,1‐diphosphonic acid salt (EA‐MEL) was synthesized by a straightforward acid–base neutralization reaction between 1‐hydroxyethylidene‐1,1‐diphosphonic acid (EA) and melamine (MEL). This compound, which contains phosphorus and nitrogen elements, exhibits a 40% carbon residue at a temperature of 800°C. When combined with diethyl aluminium hypophosphite (OP1230) as a flame‐retardant composite in polylactic acid (PLA)/polyamide 11 blends through melt blending, a synergistic effect between the two flame retardants is observed. Consequently, the limiting oxygen index value significantly increases to 34.3, showcasing a remarkable 64.6% improvement. Additionally, the material achieves a V‐0 rating according to UL‐94 standards, and the peak heat release rate drops to 269 kW∙m−2 with the addition of just 5 wt% EA–MEL. These results demonstrate that EA‐MEL and OP1230 contribute to the generation of phosphoric acid derivatives and the formation of a crosslinked (PN)n or (PON)n network. This network enables the formation of a complete, compact, and expanded char residue, effectively isolating heat and oxygen.
Funder
National Natural Science Foundation of China
Subject
Materials Chemistry,Polymers and Plastics,Surfaces, Coatings and Films,General Chemistry