COMPOSITE PHOSPHORUS FLAME RETARDANT COMPRISING CYCLIC ORGANOPHOSPHATE WITH MULTIPLE DOPO MOIETIES, AND MANUFACTURING METHOD THEREOF

摘要

The present invention discloses a composite phosphorus flame retardant comprising cyclic organophosphate with multiple DOPO moieties, and manufacturing method thereof. The composite structure phosphorus flame retardant has a structural formula comprising at least one organophosphate and at least two DOPO cyclic organophosphates. The method comprises: mixing the DOPO with a polyhydroxy alkane or a hydrocarbon substituent, wherein the polyhydroxy alkane has at least three hydroxy groups, and the hydrocarbon substituent has a chain with at least three carbon atoms; heating the mixture to 195-210°C and reacting for 14-17 hours in the presence of a protective gas, and then cooling to room temperature; adding a phosphorus oxohalide or an incompletely esterified phosphorus oxohalide; and heating to 55-65°C and reacting for 1.5-3 hours, then cooling to room temperature to obtain the product. The invention provides flame retardation at two decomposition temperatures, the first occurring within a range of 230-310°C, while the other occurring after 345°C. The invention has a simple composition, is easy to use, has high phosphorus contents, and provides improved flame retardance.