Preparation of Modified Expandable Graphite and Its Flame Retardant Application in Rigid Polyurethane Foam

doi:10.7503/cjcu20130686

Abstract

Abstract:

The modified expandable graphite(MEG) was prepared by grafting silane coupling agent and then loading boric acid on the surface of expandable graphite(EG), then investigate the flame retardant application of MEG in rigid polyurethane foam(RPUF). The morphology, elemental composition and structure, properties of MEG were characterized by scanning electron microscope(SEM), X-ray photoelectron spectroscopy(XPS), Fourier transform infrared(FTIR), expansion test and thermogravimetric analysis(TG), the thermal stability and combustion behaviour of RPUF/MEG were investigated by TG, limiting oxygen index(LOI) test and cone calorimeter. The results show that boric silicon compound is deposited on the surface of EG as ceramic precursor. The expansion char layer of MEG and RPUF/MEG become denser, and the mount of residual char of MEG and RPUF/MEG are increased by 8.7% and 3.7% at 800 ℃, respectively. Compare to RPUF/EG, the LOI of RPUF/MEG system is somewhat increased, the peak value of heat release is reduced by 10%, smoke production rate and CO release rate are also decreased significantly. Improving of RPUF/MEG system in flame retardation is related to participation of boric silicon ceramic precursor which promotes the effect of each component and enhanced the barrier property of char layer.

Key words: Modified expandable graphite, Boric acid, Thermal stability, Rigid polyurethane foam, Flame retardancy

CLC Number:

O633.2

TrendMD:

XU Dong-Mei, DING Fei, HAO Jian-Wei, DU Jian-Xin. Preparation of Modified Expandable Graphite and Its Flame Retardant Application in Rigid Polyurethane Foam[J]. Chem. J. Chinese Universities, 2013, 34(11): 2674.

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Preparation of Modified Expandable Graphite and Its Flame Retardant Application in Rigid Polyurethane Foam

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