Study On Synthesis Of Acrylic Derivatives Containing Silicon And Flame Retardancy On Polycarbonate

Plastics and textiles find many uses and add greatly to the quality of modern-day life. However the fire safety results from these polymers have become a serious problem. Hydrosilylation is considered one of the most chemical reactions that are studied and used in organic silicon chemistry field. Silicon-containing flame retardants, as a new sort of flame retardants, become a research hotspot because of its highly effective, non-toxic, especially friendly to the environment. In this work, hydrosilylation was firstly applied to design some silicon-containing compounds, and then, the flame-retardant performance of these compounds on Polycarbonate(PC) was investigated.In this paper, the hydrosilylation of acrylic acid with Diethoxymethylsilane, Tetramethyldisiloxane and Methyl hydrogen polysiloxane oil were studied. Products were characterized by FT-IR、NMR(1H-NMR,13C-NMR) respectively. The results show that when the platinum dioxide is used as catalyst,1,4-Addition reaction, also named conjugate addition reaction occurs between acrylic acid and silicon hydrogen compounds. Flame-retardant results demonstrated that adding the product synthesized from acrylic acid and Methyl hydrogen polysiloxane oil could obviously shorten the burning time of composite materials in the UL-94test, but molten drop appear when it’s burning.In the following work, we used methyl hydrogen polysiloxane oil as raw materials to synthesize methyl phenyl hydrogen polysiloxane oil. By comparison, another methyl phenyl hydrogen polysiloxane oil was also synthesized by D4H, D4and Diphenyldimethoxysilane. The structure of products were characterized by FT-IR, NMR(1H-NMR), the thermal stability was analyzed by TGA and the molecular weight was analyzed by GPC. The results show that the product from methyl hydrogen polysiloxane oil has better thermal stability and larger molecular weight in relative to methyl phenyl hydrogen polysiloxane oil from D4H, D4and Diphenyldimethoxysilane and methyl hydrogen polysiloxane oil. The studies of SEM and EDS show it has better compatibility and better flame retardant performance with PC, and it could migrate more easily to the material surface, In the flame-retardant measurement, when it’s mass fraction is1wt%, the UL-94rating of PC materials reach V-0and the LOI value of the composites is33.6%. when increasing the content of phenyl oil to5wt%, the LOI value of the composites reaches37.9%.