Phosphorus-containing flame retardant with epoxy group as well as preparation method and application of flame retardant

[0069] A phosphorus-containing flame retardant with an epoxy group, the structure is as follows:

[0070]

[0071] The preparation method is as follows:

[0072] (1) Under a nitrogen atmosphere, put 50mL of glacial acetic acid, 1mol of dimethyl phosphite and 1mol of methacrylic acid into a three-port 200mL glass reactor with a stirring device, and dissolve 1mmol of Pb catalyst in 20mL of glacial acetic acid, then added dropwise to the above reaction system, reacted at 60°C for 12h, then added saturated sodium carbonate solution, separated the water phase with a separatory funnel, dehydrated under reduced pressure and washed with water until neutral, dried After obtaining intermediate 1;

[0073](2) Add the intermediate 1 obtained in step 1, 2 mol of epichlorohydrin and 0.02 mol of triethylbenzyl ammonium chloride into a 1000 mL three-necked glass flask, and simultaneously add 100 mL of 40 wt % sodium hydroxide aqueous solution dropwise, and heat the mixture at 110° C. Sti...

[0076] A phosphorus-containing flame retardant with an epoxy group, the structure is as follows:

[0077]

[0078] The preparation method is as follows:

[0079] (1) Under a nitrogen atmosphere, put 50mL of glacial acetic acid, 1mol of dimethyl phosphite and 1mol of acrylic acid into a three-port 200mL glass reactor with a stirring device, and dissolve 1mmol of Pb catalyst in 20mL of ice at 60°C under stirring conditions. Acetic acid, then added dropwise to the above reaction system, reacted at 60°C for 12h, then added saturated sodium carbonate solution, separated the water phase with a separatory funnel, dehydrated under reduced pressure and washed with water until neutral, dried to obtain Intermediate 1;

[0080] (2) Add the intermediate 1 obtained in step 1, 2 mol of epichlorohydrin and 0.02 mol of triethylbenzyl ammonium chloride into a 1000 mL three-necked glass flask, and simultaneously add 100 mL of 40 wt % sodium hydroxide aqueous solution dropwise, and heat the m...

[0083] A phosphorus-containing flame retardant with an epoxy group, the structure is as follows:

[0084]

[0085] (1) Under a nitrogen atmosphere, put 50mL of glacial acetic acid, 1mol of dimethyl phosphite and 1mol of tetrahydrophthalic anhydride into a three-port 200mL glass reactor with a stirring device, and mix 1mmol of The Pb catalyst was dissolved in 20mL of glacial acetic acid, and then added dropwise to the above reaction system, reacted at 60°C for 12h, then added saturated sodium carbonate solution, separated the water phase with a separatory funnel, dehydrated under reduced pressure and washed with water until Neutral, intermediate 1 is obtained after drying;

[0086] (2) Add the intermediate 1 obtained in step 1, 3 mol of epichlorohydrin and 0.04 mol of triethylbenzyl ammonium chloride into a 1000 mL three-necked glass flask, and simultaneously add 150 mL of 40 wt % sodium hydroxide aqueous solution dropwise, and heat the mixture at 110° C. Stir and react for...