Synthesis method of crude phenol-based benzoxazines resin prepolymers
The technology of a crude phenolic benzene and a synthesis method is applied in the synthesis field of resin prepolymer, can solve the problems of environmental pollution, high process cost and the like, and achieves the effects of simple and easy-to-obtain raw materials, low cost, and improved utilization of added value.
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Embodiment 2
[0023] Example 2: A synthetic method of a crude phenolic benzoxazine resin prepolymer, which uses crude phenols, formaldehydes and primary amines as raw materials, adding a reaction solvent and reacting at 90°C for 7 hours, and the reaction is complete Finally, the organic phase was washed with deionized water and then separated, added anhydrous magnesium sulfate to dry for 3 hours and filtered, and the filtrate was vacuum-dried at 50°C for 6 hours to obtain a crude phenolic benzoxazine resin prepolymer, wherein , the molar mass ratio of the crude phenols, formaldehydes and primary amine compounds is 3:2:3; the crude phenols are industrial crude phenols and phenolic compounds The blended phenols, wherein, the mass percentage of crude phenols in the blended phenols is ≥50%; R 1 is one or more H; the primary amine compound is R 2 NH 2 , R 2 for C 2 -C 20 Halogenated alkyl; Described formaldehyde is paraformaldehyde; Described reaction solvent is chloroform; The H NMR spect...
Embodiment 3
[0024] Embodiment 3: a kind of synthetic method of crude phenolic benzoxazine resin prepolymer, it is to be raw material with crude phenols, formaldehydes and primary amine compounds, add reaction solvent and react at 72 ℃ for 5.5h, react After completion, wash the organic phase with deionized water and separate the organic phase, add anhydrous magnesium sulfate to dry for 2.5 hours and then filter, and the filtrate is vacuum-dried at 40°C for 4.5 hours to obtain the crude phenolic benzoxazine resin prepolymerized body, wherein the molar mass ratio of the crude phenols, formaldehydes and primary amine compounds is 1.5:2:0.8; the crude phenols are industrial crude phenols and phenolic compounds The blended phenols, wherein, the mass percentage of crude phenols in the blended phenols is ≥50%; R 1 is a halogen atom; the primary amine compound is R 2 NH 2 , R 2 for C 2 -C 20 Aminoalkyl; the formaldehydes are the mixture of aqueous formaldehyde and paraformaldehyde; the react...
Embodiment 4
[0025]Example 4: A synthetic method of a crude phenolic benzoxazine resin prepolymer, which uses crude phenols, formaldehydes and primary amines as raw materials, adding a reaction solvent and reacting at 75°C for 6 hours, and the reaction is complete Finally, the organic phase was washed with deionized water, and the organic phase was separated, dried by adding anhydrous magnesium sulfate for 2.8 hours, and then filtered. The filtrate was vacuum-dried at 42°C for 5 hours to obtain a crude phenolic benzoxazine resin prepolymer. Wherein, the molar mass ratio of the crude phenols, formaldehydes and primary amine compounds is 1.8:2:1; the crude phenols are industrial crude phenols and phenolic compounds The blended phenols, wherein, the mass percentage of crude phenols in the blended phenols is ≥50%; R 1 for C 1 -C 20 The alkyl or alkoxy group; the primary amine compound is R 2 NH 2 , R 2 The formaldehyde is an amino group; the formaldehyde is an aqueous formaldehyde soluti...
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