A kind of triazine hyperbranched polyurea char-forming agent and preparation method thereof
A technology of hyperbranched polyurea char-forming agent, applied in the field of hyperbranched polyurea char-forming agent and its preparation, can solve the problems of difficult dispersion, harmful water resources, poor matrix compatibility, etc., and achieves good compatibility and char-forming. Good performance and high thermal stability
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Embodiment 1
[0032] Take 20 parts of toluene diisocyanate and add 50 parts of acetone to dissolve it completely, then pour the solution into a three-necked flask, and at the same time add 30 parts of melamine into the three-necked flask. After fully stirring at a rotating speed of 20 min, 2 parts of triethylamine were added, and then the reaction was continued for 5 hours. Washing with 50 parts of N,N-dimethylformamide solvent for several times and then washing with water, drying the obtained solid at 100° C. for 8 hours to obtain a triazine hyperbranched polyurea char-forming agent.
[0033] In the above-mentioned experimental process, the infrared spectrograms of the prepared triazine hyperbranched polyurea char-forming agent, melamine and isocyanate are as follows: figure 1 As shown, 1512cm -1 It is the vibration absorption peak of -NH-CO-NH-, 1600cm -1 It is the -C=O- vibration absorption peak in -NH-CO-NH-, and at 2278cm -1 The -NCO group vibration peak at 3300cm -1 -3500cm -1 -N...
Embodiment 2
[0035] Take 30 parts of 4,4'-diphenylmethane diisocyanate and add 50 parts of N,N-dimethylformyl to dissolve it completely, then pour the solution into a three-necked flask, and at the same time add 40 parts of melamine In the three-necked flask, under nitrogen atmosphere, after fully stirring at 80° C. at a speed of 150 r / min for 10 minutes, 3 parts of triethanolamine were added, and then the reaction was continued for 6 hours. Washing with water after washing with 70 parts of acetone solvent for several times, drying the obtained solid at 80° C. for 6 hours to obtain a triazine hyperbranched polyurea char-forming agent.
Embodiment 3
[0037] Take 35 parts of 2,4'-diphenylmethane diisocyanate and add 60 parts of N,N-diethylformamide to dissolve it completely, then pour the solution into a three-necked flask, and at the same time add 35 parts of melamine In the three-necked flask, under a nitrogen atmosphere, after fully stirring at 70° C. for 30 minutes at a speed of 120 r / min, 4 parts of triethanolamine were added, and then the reaction was continued for 7 hours. Washing with 60 parts of N,N-dimethylacetamide solvent for several times and then washing with water, drying the obtained solid at 70° C. for 6 hours to obtain a triazine hyperbranched polyurea char-forming agent.
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