Polyether amine benzoxazine prepolymer and method for preparing same
A benzoxazine and polyetheramine type technology, which is applied in the field of polyetheramine type benzoxazine prepolymer and its preparation, can solve the problem of difficult to use, brittle polybenzoxazine resin, not very high mechanical properties, etc. problem, to achieve the effect of low density, simple preparation process and excellent mechanical properties
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[0021] Example 1
[0022] Preparation of polyetheramine benzoxazine prepolymer:
[0023] Add 5.04g (0.023mol) polyetheramine, 5.28g (0.023mol) bisphenol A, and 2.78g (0.092mol) paraformaldehyde into a 250mL three-necked flask equipped with a condenser, magnetic stirring, and thermometer. , The molar ratio of phenolic hydroxyl and amino functional groups is 2:1:1, then add 51mL of toluene / ethanol mixed solvent (toluene to ethanol volume ratio 2:1), mix well and heat to 80℃ to react for 9h. After the reaction, it will react. Pour the solution into 100mL methanol solution (concentration 50wt%) for precipitation to obtain a milky white suspension, stand for 12h, remove the supernatant to obtain a white precipitate, vacuum dry the white precipitate at 50℃ for 8h, and finally grind the dried product The brown-yellow powder obtained is the polyetheramine benzoxazine prepolymer.
[0024] The molecular structural formula of polyetheramine used in this embodiment is:
[0025]
[0026] Such as...
Example Embodiment
[0028] Example 2
[0029] Preparation of polyetheramine benzoxazine prepolymer:
[0030] Add 8.40g (0.023mol) polyetheramine, 5.28g (0.023mol) bisphenol A, 2.78g (0.092mol) formaldehyde into a three-necked flask equipped with condenser, magnetic stirring, thermometer, aldehyde group, phenolic hydroxyl group and The molar ratio of the amine functional group is 2:1:1, and then 51mL of chloroform is added as a solvent, and the mixture is evenly mixed and heated to 80°C for 10 hours. After the reaction is completed, the reaction solution is poured into 100mL of methanol solution (concentration 60wt%) for precipitation. Obtain a milky white suspension, stand for 24h, remove the supernatant to obtain a white precipitate, dry the white precipitate in vacuum at 60°C for 6h, and finally grind the dried product to obtain a brown-yellow powder, which is a polyetheramine benzoxone Oxazine prepolymer.
[0031] The molecular structural formula of polyetheramine used in this embodiment is:
[0032...
Example Embodiment
[0033] Example 3
[0034] Preparation of polyetheramine benzoxazine prepolymer:
[0035] Add 9.71g (0.023mol) polyetheramine, 5.28g (0.023mol) bisphenol A, 3.34g (0.11mol) formaldehyde into a three-necked flask equipped with condenser, magnetic stirring, thermometer, aldehyde group, phenolic hydroxyl group and The molar ratio of amine functional groups is 2.4:1:1, then add 51mL dimethylformamide as solvent, mix well and heat to 110℃ for 6h, after the reaction, pour the reaction solution into 100mL methanol solution (concentration 70wt%) Precipitate to obtain a milky white suspension, stand for 12h, remove the supernatant to obtain a white precipitate, dry the white precipitate in vacuum at 50℃ for 8h, and finally grind the dried product to obtain a brown-yellow powder, which is polyetheramine benzene And oxazine prepolymer.
[0036] The molecular structural formula of polyetheramine used in this embodiment is:
[0037]
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