Phosphorus-nitrogen copolyester material containing cyclotriphosphazene group and preparation method thereof
A technology of phosphorus-nitrogen copolyester and cyclotriphosphazene, which is applied in the field of phosphorus-nitrogen copolyester material and its preparation, can solve the problems of harsh processing and preparation technology, single material solubility, etc., and achieves good solubility in polar solution, The effect of high carbon residue rate and good flame retardant performance
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[0023] (1) Dissolve 1 part of polyhexachlorocyclotriphosphazene prepared by multiple sublimation in tetrahydrofuran (THF) solvent, add dropwise the prepared 4 parts of sodium phenoxide THF solution, and react under nitrogen protection at 40°C for 24 hours. Remove THF by rotary distillation, wash with deionized water several times, and vacuum dry at 80°C for 24 hours to obtain a milky white colloid;
[0024] (2) Dissolve 1 part of solid powder obtained in step (1) in THF solvent, then add 6 parts of hydroquinone in THF solution dropwise, under nitrogen protection, react at 40° C. for 12 hours. Rotary distillation to remove THF, repeated washing with deionized water and ethanol, and vacuum drying at 40-80°C for 12 hours to obtain a yellow colloid;
[0025] (3) Heat 1 part of the yellow colloid and 0.5 wt% anhydrous acetic acid obtained in step (2) to 180° C. in a vacuum environment, and add 2 parts of terephthaloyl chloride (TPC). After reacting for 2 hours, wait for the reacti...
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