A composite fire retardant and its application

The present invention discloses a composite fire retardant and its application. The flame retardant composite comprising the components by weight percentage: 15 to 99% of a flame retardant; synergist 1 to 85%; other additives 0 to 25%; the synergist containing at least one of NH4 + ammonium salts; the additive is a char-forming agent and / or stabilizer. The compound of the present invention by adding a suitable flame retardant synergists, can significantly improve flame retardant efficiency hypophosphites or alkyl phosphinate flame retardant is greatly reduced or hypophosphites hindered alkyl phosphinates the amount of the flame retardant.