Flame-retardant epoxy resin curing agent and preparation method thereof

[0016] A flame-retardant epoxy resin curing agent, comprising the following raw materials in parts by mass: 20-40 parts of isophorone diamine, 10-20 parts of diaminodiphenylmethane, and 10-15 parts of n-butanol hydroglyceryl ether , 5-8 parts of oxalic acid, 3-7 parts of phthalic anhydride, 2-4 parts of bis(3-aminobenzyl)methylphosphine oxide.

[0017] The present invention also provides a preparation method for the above-mentioned flame-retardant epoxy resin curing agent, comprising the following steps: successively adding isophorone diamine, diaminodiphenylmethane, diluent, oxalic acid, phthalic anhydride , Bis(3-aminobenzyl)methylphosphine oxide gradually mixed slowly, reacted at 0.1-0.2MPa, 50-70℃ for 3-6 hours. After the reaction is finished, the solvent is distilled off under reduced pressure, and then deionized water 2-3 times the amount of the solid content is added to the solid content to disperse to obtain a curing agent.

[0019] A flame-retardant epoxy resin curing agent, comprising the following raw materials in parts by mass: 20-40 parts of isophorone diamine, 10-20 parts of diaminodiphenylmethane, and 10-15 parts of n-butanol hydroglyceryl ether , 5-8 parts of oxalic acid, 3-7 parts of phthalic anhydride, 2-4 parts of bis(3-aminobenzyl)methylphosphine oxide, bis(4-aminophenyl)-bis(9,10 -1-3 parts of dihydro-9-oxa-10-phosphaphenanthrene-10-oxide)methane.

[0020] The present invention also provides a preparation method for the above-mentioned flame-retardant epoxy resin curing agent, comprising the following steps: successively adding isophorone diamine, diaminodiphenylmethane, diluent, oxalic acid, phthalic anhydride , Bis(3-aminobenzyl)methylphosphine oxide gradually mixed slowly, reacted at 0.1-0.2MPa, 50-70℃ for 3-6 hours. After the reaction is finished, the solvent is distilled off under reduced pressure, and then deionized water 2-3 times the amount of the solid content is added to the so

[0022] A flame-retardant epoxy resin curing agent, comprising the following raw materials in parts by mass: 20-40 parts of isophorone diamine, 10-20 parts of diaminodiphenylmethane, and 10-15 parts of n-butanol hydroglyceryl ether , 5-8 parts of oxalic acid, 3-7 parts of phthalic anhydride, 2-4 parts of bis(3-aminobenzyl)methylphosphine oxide, and 1-2 parts of maleimide tungoleic anhydride.

[0023] The present invention also provides a preparation method for the above-mentioned flame-retardant epoxy resin curing agent, comprising the following steps: successively adding isophorone diamine, diaminodiphenylmethane, diluent, oxalic acid, phthalic anhydride , Bis(3-aminobenzyl)methylphosphine oxide gradually mixed slowly, reacted at 0.1-0.2MPa, 50-70℃ for 3-6 hours. After the reaction is finished, the solvent is distilled off under reduced pressure, and then deionized water 2-3 times the amount of the solid content is added to the solid content to disperse to obtain a curing agent.