Nie SB, Song L, Tai QL, Zhan J, Lu HD, Hu Y (2009b) Synergistic Effects of Nanoporous Nickel Phosphates VSB-1 on an Intumescent Flame-Retardant Low-Density Polyethylene (LDPE) System. Polymer-Plastics Technology and Engineering 48(4), 464-469. [In English]

Web link: http://dx.doi.org/10.1080/03602550902725464

Keywords:

Intumescent flame-retardant (IFR), LDPE, Nanoporous nickel phosphates, Synergistic effect, polyphosphate pentaerythritol mixtures, ammonium polyphosphate, ester, formation, polymers, mechanism, polypropylene, zeolite

Abstract: Nanoporous nickel phosphates VSB-1 was synthesized by hydrothermal method, and its structure was characterized by X-ray diffraction (XRD), thermogravimetric analyses (TGA) and high resolution transmission electron microscopy (HRTEM). The flame retardancy and thermal behaviour of intumescent flame retardants (IFR) with and without VSB-1 for low-density polyethylene (LDPE) were evaluated by LOI, UL-94 burning test, TGA and cone calorimeter test. With the addition of 2wt% VSB-1 to LDPE/IFR systems, the LOI value increases from 28.7 to 31, and UL-94 rating raises from V-1 rating to V-0 rating. The results of cone calorimeter show that heat release rate (HRR) peak decrease substantially from 511KW/m2 to 407KW/m2 with 2wt% VSB-1 in LDPE/IFR systems. The scanning electron microscopy (SEM) indicates the quality of char forming of LDPE/IFR/ VSB-1 is superior to that of LDPE/IFR.