Synthesis Of Novel Flame-retardant Containing Silicon And Research Of Its Flame Retardancy Effect On PC/ABS

Flame-retardant (FR) is developing fast with the wide using of polymers. As people are paying more attention to the environment and the requirement of forbidding using halogen grows, development of novel non-halogen FR becomes a focus nowadays, and phosphorus is attracting a lot of attention. Certain numbers of new non-halogen FR have been developed based on phosphorus.Silicone starts attracting people's attention as an effect part of FR. It's reported that there are some synergetic function between silicon and phosphorus. In our study, two different phosphates are chosen to react with siloxane and silicane respectively to synthesis two FRs with both phosphorus and silicon. The main tasks contains: the synthesis and characterization of the two novel FRs and intermedias; the application of the novel FRs in PC/ABS and discussion about their effects on flame retardancy and thermal properties. 1. Synthesis and characterization of the novel FRs containing silicon. The novel flame retardant containing phosphorus, silicon and nitrogen (PSN) has been synthesized from pentaerythritol (PER), Phosphorus oxychloride and N-aminopropyle Methyl Diethoxy Silane; the novel flame retardant containing phosphorus and silicon (PRS) has been synthesized from phenyl diphosphoryl chloride, dimethyldichlorosilicane and Resorcin. The chemical structures of FRs are characterized by FTIR and NMR. The thermal properties of FRs are investigated by TGA under nitrogen and air, and char yield more than 50% can be got at 800℃.2. Investigations of the effect of the synthesized FRs containing silicon on the flame retardancy and thermal property of PC/ABS.PSN and PRS are incorporated into PC/ABS. The FRs enhance the flame retardancy of PC/ABS successfully through the results of LOI test and UL-94 test. TGA result reveals the addition of FRs improves the high thermal stability of PC/ABS. SEM results show that the FRs help PC/ABS to form a more stable char layer which results in a better flame retardancy.