Journal
APPLIED CLAY SCIENCE
Volume 168, Issue -, Pages 96-105Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2018.11.004
Keywords
Ethylene vinyl acetate (EVA); Hydrotalcite; Pentaerythritol diphosphate (PEDP); Flame retardancy; Melamine resin (MF)
Funding
- Joint Research Program of Hunan Provincial Natural Science Foundation (Xiangtan) of China [2016JJ5030]
- Hunan Provincial Innovation Foundation For Postgraduate [CX2018B043]
- National Natural Science Foundation of China [21777135]
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A novel phosphorus-nitrogen-clay flame retardant (PD-LDH@MF) was prepared via intercalating pentaerythritol diphosphate (PEDP) into MgAl hydrotalcite (LDH) interlayers and then capping melamine resin (MF) on the surface using in-situ copolymerization. The structure, morphology thermal stability and flame retardancy of the PD-LDH@MF material were characterized by various analytic methods. The results revealed that PEDP anions were intercalated successfully into the interlayers of the LDH, and the PEDP-intercalated LDH (PD-LDH) was also encapsulated in MF. The PD-LDH@MF exhibited better compatibility with EVA matrix than the EVA/PD-LDH aue to nigner nyaropnoDicity Dy capping MF on me surface of me ru-Luri particles. The incorporation of tile PD-LDH@MF into EVA could improve not only the thermal stability but also the thermal oxidative resistance for EVA matrix. The limiting oxygen index (LOI) of the EVA/PD-LDH@MF composite with 15 wt% loading was about 27.5%, while the composite attained V-0 rating. The observable improvement in flame retardancy of the EVA/PD-LDH@MF composite was because intercalated PEDP could promote to remain more N and C elements, and P species in PEDP participated into the connecting reaction to form the more continuous and more compact char layer on the char surface, thus hindering heat diffusion and oxygen transmission effectively.
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