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Four kinds of new piperazinomethyl-bis-phosphonic acid M n+ (PIPEABPM n+ ) were synthesized and their combustive properties of Pinus rigida plates treated with PIPEABPM n+ were tested. Pinus rigida specimens were painted in three times with 15 wt% PIPEABPM n+ solutions at the room temperature. After drying specimen treated with chemicals, combustive properties were examined by the cone calorimeter (ISO 5660-1). As a result, the combustion-retardation properties were increased by due to the treated PIPEABPM n+ solutions in the virgin pinus rigida. Especially, the specimens treated with PIPEABPM n+ showed both the lower peak heat release rate (HRR peak ) (162.02~145.36) s and total heat release rate (THRR) (73.0~67.4) MJ/m 2 than those of virgin piperazinomethyl-bis-phosphonic acid (PIPEABP)-plate. Compared with virgin PIPEABP-plate, the specimens treated with the PIPEABPM n+ showed low combustive properties. However the specimens treated with PIPEABPM n+ showed both the shorter time to ignition (TTI) (67~23) s and the time to flameout (Tf) (472~433) s than those of virgin PIPEABP-plate by increasing the thermal conductivity.

Two kinds of new piperazinomethyl-bis-phosphonic acid M n+ (PIPEABPM n+ ) were synthesized and their combustive properties of Pinus rigida plates treated with PIPEABPM n+ were tested in comparison with the previously synthesized chemicals. Pinus rigida specimens were painted in three times with 15 wt% PIPEABPM n+ solutions at the room temperature. After drying specimen treated with chemicals, combustive properties were examined by the cone calorimeter (ISO 5660-1). As a result, the combustion-retardation properties were partially increased by due to the treated PIPEABPM n+ solutions in the virgin Pinus rigida. Especially, the specimens treated with PIPEABPM n+ showed both the lower peak heat release rate (HRR peak ) (173.48~145.36) s and total heat release rate (THRR) (73.0~55.2) MJ/m 2 than those of virgin piperazinomethyl-bis-phosphonic acid (PIPEABP)-plate. Compared with virgin PIPEABP-plate, the specimens treated with the PIPEABPM n+ showed low combustive properties. However the specimens treated with PIPEABPM n+ showed both the shorter time to ignition (TTI) (58~18) s and the time to flameout (Tf) (564~456) s than those of virgin PIPEABP-plate by increasing the thermal conductivity.