Production method for diamin type high fire-retardancy benzoxazine resin containing phosphor
A benzoxazine and diamine-based technology, applied in the field of thermosetting resin preparation, to achieve good flame retardancy, good thermal performance, and high heat resistance
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Embodiment 1
[0034] Synthesis of 3,3'-phosphophenyl-6-methyl-3,4-dihydro-2H-1,3-benzoxazine resin.
[0035] The preparation process of synthesizing benzoxazine resin with phosphorus-containing diamine: 2 (4-aminophenyl) phenyl phosphate, monohydric phenol: p-cresol and formaldehyde as raw materials:
[0036] Add 75ml of chloroform, 0.7g of triethylamine and 24ml of 35% formaldehyde solution in sequence into a 250ml three-neck flask equipped with a stirrer and a condenser, and stir to mix. Slowly add 25.6g of 2(4-aminophenyl)phenyl phosphate, control the reaction temperature not to exceed 30°C, and adjust the pH value to 7 with triethylamine to generate N-dimethylol compound and keep it stable in the solution ;
[0037] Add 15.5g p-cresol after reacting for 15min, heat up to reflux, stop the reaction after the mixed solution reacts at reflux temperature for 5h, and make N-dimethylol compound and phenolic hydroxyl group and the ortho-position on benzene ring produce condensation reaction, ...
Embodiment 2
[0042] Synthesis of 3,3'-phosphophenyl-5-methyl-3,4-dihydro-2H-1,3-benzoxazine resin.
[0043] The preparation process of synthesizing benzoxazine resin with phosphorus-containing diamine: 2 (4-aminophenyl) phenyl phosphate, monohydric phenol: m-cresol and formaldehyde as raw materials:
[0044] Add 90ml of chloroform, 0.84g of triethylamine and 28.8ml of 36% formaldehyde solution in sequence into a 250ml three-neck flask equipped with a stirrer and a condenser, and stir to mix. Slowly add 30.7g of 2(4-aminophenyl)phenyl phosphate, control the reaction temperature not to exceed 30°C, and adjust the pH value to 7 with triethylamine to generate N-dimethylol compound and keep it stable in the solution ;
[0045] After reacting for 15 minutes, add 18.6 g of m-cresol, raise the temperature to reflux, and stop the reaction after the mixed solution reacts at the reflux temperature for 5 hours, so that the N-dimethylol compound, the phenolic hydroxyl group and the ortho position on t...
Embodiment 3
[0050] Synthesis of 3,3'-Phenyl Phosphate-3,4-Dihydro-2H-1,3-Benzoxazine Resin
[0051] The preparation process of synthesizing benzoxazine resin with phosphorus-containing diamine: 2 (4-aminophenyl) phenyl phosphate, monohydric phenol: phenol and formaldehyde as raw materials:
[0052] Add 75ml of chloroform, 0.7g of triethylamine and 24ml of 37% formaldehyde solution in sequence to a 250ml three-necked flask equipped with a stirrer and a condenser, and stir to mix. Slowly add 25.6g of 2(4-aminophenyl)phenyl phosphate, control the reaction temperature not to exceed 30°C, and adjust the pH value to 7 with triethylamine to generate N-dimethylol compound and keep it stable in the solution ;
[0053] After reacting for 15 minutes, add 13.5g phenol, raise the temperature to reflux, and stop the reaction after reacting the mixed solution at the reflux temperature for 5 hours, so that the N-dimethylol compound and the phenolic hydroxyl group and its ortho position on the benzene ri...
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