Synthesis and Application in Polypropylene of a Novel of Phosphorus-Containing Intumescent Flame Retardant

Jian-Dong Zuo,Shu-Mei Liu,Qi Sheng

doi:10.3390/molecules15117593

Abstract

A novel phosphorus-containing triazine oligomer poly(2-morpholinyl-4-penta-erythritol phosphate-1,3,5-triazine) (PMPT) was synthesized as a kind of tri-component intumescent flame retardant (IFR). The chemical structure of PMPT was characterized by FTIR, 1H-NMR and 31P-NMR, and the mechanical and flammability properties of FR-PP were measured. The FTIR results showed that the expected chemical reactions had happened at each step. The 1H-NMR and 31P-NMR spectra also agreed with the chemical structure of PMPT. The slight effect of PMPT on the mechanical properties of FR-PP suggested that PMPT and PP are compatible. The high limited oxygen index (LOI) values of FR-PP revealed that PMPT was an efficient IFR and there was the synergistic effect between PMPT and ammonium polyphosphate/ pentaerythritol (APP/PER).

Highlights

Intumescent Flame Retardant (IFR) systems have been used recently in flame retardedPolypropylene (FR-PP) as a kind of halogen-free flame retardant
Intumescent flame retardant compounds are usually composed of an acid source, a carbon source and a gas source, such as ammonium polyphosphate (APP), pentaerythritol (PER) and melamine [1]
The phosphorus-containing triazine oligomer PMPT was synthesized by a three step chemical reaction

Summary

Introduction

Intumescent Flame Retardant (IFR) systems have been used recently in flame retardedPolypropylene (FR-PP) as a kind of halogen-free flame retardant. The main component of an intumenscent flame retardant is the element nitrogen, which has a good synergic flaming effect with phosphorus in the flame retarding [4,5]. Liu synthesized the phosphoruscontaining triazine oligomer poly(2-piperazinylene-4-morpholino-1,3,5-triazine) (PPMT) and found that PPMT had a good effect in the delaying combustion of PP [8], but PPMT has no carbon atoms in the main molecular chain, so it has no carbon source and has to be used together with PER in order to achieve good flame retarding. A novel phosphorus-containing triazine oligomer poly(2morpholinyl-4-pentaerythritol phosphate-1,3,5-triazine) (PMPT) was synthesized and the chemical structure of the product was character by means of FTIR, 1H-NMR and 31P-NMR

Methods

Results

Conclusion