Flame retardant epoxy resins were prepared by a simple mixed method using am-monium aluminum carbonate hydroxy hydrate(AACHH)as a halogen-free flame retardant.The pre-pared samples were characterized by X-ray diffraction,thermogravimetric and differential scanning calorimetry,scanning electron microscope and limiting oxygen index(LOI)experiments.Effects of AACHH content on LOI of epoxy resins/AACHH composite and flame retardant mechanism were investigated and discussed.Results show that AACHH exhibites excellent flame-retardant properties in epoxy resin(EP).When the content of AACHH was 47.4%,the LOI of EP reached 32.2%.Moreover, the initial and terminal decomposition temperature of EP increased by 48 ℃and 40℃,respectively. The flame retarded mechanism of AACHH is due to the synergic flame retardant effects of diluting, cooling,decomposition resisting and obstructing.
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