| With the the widespread of polymer materials in our life, flame retardants become more and more popular, and due to the awareness of environmental protection, more and more attention is paid by people to the environmental performance of flame retardants. Silicone-based flame retardants, phosphorus-based flame retardants, nitrogen-based flame retardants can carry out excellent flame-retardant effect, and they are also environmentally friendly flame retardants, but has their own merits.Two kind of new silicone-nitrile flame retardants trimethylsiloxane-cyclophosphazene (TMSCP) and silicone-cyclophosphazene (SCP) were synthesized in this paper with raw materials of hexachloro-cyclotriphosphazene, trimethyl-silanol, hydroxyl silicone oil, triethylamine. Infrared and31P-NMR were used to characterization analysis of the structure of the flame retardants structure. And the product was proved to be the aimed product. The experimental conditions of the synthesis process, including reaction time, reaction temperature, acid binding dosage, ratio of raw materials, etc. were investigated and optimized. The thermal stability of the product was studied by the thermal gravimetric analyzer, and they were of better thermal stability, can be used as flame retardants.SCP was added to PC as a flame retardant in this paper, which formed a PC/SCP composite and it was showed to be of excellent thermal stability and flame retardant properties through the study of thermal stability, flame retardant properties and carbon layer after combustion, etc. focused on in this experiment. And the LOI value of it was significantly improved, which was increased21.4%, and raised from the level of V-2to V-0; the morphology of the carbon layer of PC/SCP composite was neat and densified, as well as of good smoke suppression performance, thereby, the flame retardant performance of the composite was also improved. The preliminary exploring of the mechanism of the flame retardant was conducted through thermal degradation analysis of the PC/SCP composite, it was the cross-linking and the dilution of the non-flammable gases generated happened in the degradation process that improved the thermal stability and flame retardant properties of the composite, and reduced the thermal degradation rate of PC. The adding of SCP had little effect on the tensile mechanical properties of materials through the mechanical properties testing of the PC/SCP composite, which was proved to be good flame retardant, and will be of good prospects in its using. |
