Abstract: Aluminum Iron methyl cyclohexylphosphinate double salt（AlFe（MHP） ）was synthesized initially by neutralization reaction of methylcyclohexylphosphinate acid with NaOH，followed by reacting with metal compounds. The product was characterized by FTIR，XRF and XRD to analyse its structure. When AlFe （MHP）was used as flame retardant in epoxy resin （EP） ， the flammability and thermal stability of the composite were discussed preliminarily. The results presented that the Limit Oxygen Index （LOI）of EP with 10 wt% filler loading improved from 19. 8% to 28. 4%，and the vertical burning test achieved at UL94 V-0 rating. TG analyses showed that AlFe （MHP）had excellent thermal stability. The tests of flammability revealed that AlFe （MHP）had a strong inhibition effect on Heat Release Rate （HRR）of the composites.

Key words: novel alkyl phosphinate, epoxy resin(EP), synthesis