STUDIES ON SYNTHESIS AND FIRE RETARDANCE OF TETRABROMOBISPHENOL A

The synthetic conditions of tetrabromobisphenol A were studied.Char yield and thermokinetic parameters during pyrolysis of wood treated with tetrabromobisphenol A were studied by TG-DTA method.Results showed that tetrabromobisphenol A yield increased from 70.7% to 85.6%,and bromine content increased from 54.1% to 55.4% as the condition was converted from room temperature to ice-water bath.The yield increased from 85.6% to 93.4% as benzene was used as a solvent to replace alcohol.The yield increased from 93.4% to 94.2%,bromine content increased from 56.1% to 58.8% and melting point reached 179.0-181.3 ℃ as the dosage of raw materials changed from 1∶2 to 1∶2.4.The char yield increased from 31.2% to 45.4%, after Cunninghamia lanceolata wood was treated with tetrabromobisphenol A.By elution experiment,char yield loss of wood treated by ammonium phosphate is 26.7%,compared to 4.27% by tetrabromobisphenol A.Optimum synthetic condition of tetrabromobisphenol A is in ice-water bath with benzene as solvent by raw material ratio 1∶2.2-2.4.The pyrolysis process of wood can be changed by tetrabromobisphenol A during fire-retarding process.Tetrabromobisphenol A possesses not only strong fire-retarding ability on wood but also strong resistance against leaching.