Reaction type phosphorus/nitrogen flame retardant, and preparation method and application thereof
A phosphorus-nitrogen-based flame retardant and reactive technology, which is applied in the field of flame retardants and their preparation, can solve the problems of toxic smoke, environmental pollution, secondary hazards, etc., and achieves reduced usage, good flame retardant effect and low cost Effect
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Embodiment 1
[0032] Example 1: Synthesis of N-ethyl-acrylamido-2-oxo-5,5-dimethyl-1,3,2-dioxaphosphorinane
[0033] Add 15.4g (0.1mol) of phosphorus oxychloride and 50mL of chloroform into a four-necked flask, stir the reaction temperature to 35°C, slowly add dropwise a mixture of 10.4g (0.1mol) of neopentyl glycol and 80mL of chloroform, After the addition, the reaction was maintained at 40°C for 3 hours, the chloroform was recovered by distillation under reduced pressure, washed with 25 mL of anhydrous ether, and filtered to obtain a colorless crystalline solid of 2-oxo-2-chloro-5,5-dimethyl -1,3,2-Dioxaphosphorinane, the yield is 86.1%, the purity is 97.1%, and the melting point is 109-110°C.
[0034] Add 9.0g (0.15mol) of ethylenediamine and 40mL of chloroform into the three-necked flask, stir, and the temperature of the reaction solution is 0°C, slowly add 18.4g (0.1mol) of the solid (2-oxo-2 -Chloro-5,5-dimethyl-1,3,2-dioxaphosphorinane) and 100mL chloroform mixture, after the addit...
Embodiment 2
[0037] The synthesis operation of N-ethyl-acrylamido-2-oxo-5,5-dimethyl-1,3,2-dioxaphosphorinane is the same as in Example 1. In the reaction of the formula (II) compound and the formula (III) compound, the amount ratio of the feeding material of the formula (II) compound and the formula (III) compound is 1.0: 1.2, and the feeding material of the acid-binding agent pyridine and the formula (II) compound The molar ratio is 2.5:1.0, the solvent is acetonitrile, the reaction temperature is 30° C., the reaction time is 6 hours, and the yield is 55.4%.
Embodiment 3
[0039] The synthetic operation of 2-oxo-5,5-dimethyl-1,3,2-dioxaphosphorinane-ethylenediamine is the same as in Example 1, N-ethyl-acrylamido-2-oxo- The synthesis operation of 5,5-dimethyl-1,3,2-dioxaphosphorinane is the same as in Example 1. In the reaction of the formula (II) compound and the formula (III) compound, the amount ratio of the feeding material of the formula (II) compound and the formula (III) compound is 1.0: 1.5, the acid-binding agent sodium bicarbonate and the formula (II) compound The molar ratio of the feed materials is 3.0:1.0, the solvent is ethyl acetate, the reaction temperature is 50° C., the reaction time is 4 hours, and the yield is 37.4%.
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