Preparation method of high-temperature-resistant polyimide resin
A technology of polyimide resin and high temperature resistance, which is applied in the field of preparation of high temperature resistant polyimide resin, can solve the problems of affecting molecular chain growth, limited molecular weight, large steric hindrance, etc. Application Potential, Effect of High Thermal Stability
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Embodiment 1
[0028] A preparation method of a high temperature resistant polyimide resin, the specific steps of the method are as follows:
[0029] (1) Under nitrogen protection, add 3.0983g (9.0mmol) of 1,2-bis(3-trifluoromethyl-4-aminophenyl)acetylene to a 250mL three-necked flask equipped with magnetic stirring and nitrogen guide , 90ml of DMAc, magnetically stirred until completely dissolved; then add 3.9982g (9.0mmol) of 4,4'-(hexafluoroisopropylidene) diphthalic anhydride, and then rinse the wall-mounted reaction with 30ml of DMAc The material powder was completely dissolved in the reaction solution, and the reaction was stirred at room temperature for 12 hours to obtain a viscous polyamic acid resin solution;
[0030] (2) adding toluene to the viscous polyamic acid solution prepared in step (1), warming up to 155°C and refluxing with water for 8 hours, sinking the reaction solution into deionized water to generate a precipitate; Filter, boil with boiling water, wash with ethanol, a...
Embodiment 2
[0035] A preparation method of a high temperature resistant polyimide resin, the specific steps of the method are as follows:
[0036] (1) Under nitrogen protection, add 1.5491g (4.5mmol) of 1,2-bis(3-trifluoromethyl-4-aminophenyl)acetylene to a 250mL three-necked flask equipped with magnetic stirring and nitrogen guide , 0.9372g (4.5mmol) of 1,2-bis(4-aminophenyl)acetylene and 90ml of NMP, stir magnetically until completely dissolved; then add 2.2869g (9.0mmol) of 1,4-difluoropyromellitic acid Dianhydride, rinse the wall-mounted reactant powder with 30ml of NMP, and stir and react at room temperature for 15 hours to obtain a viscous polyamic acid resin solution;
[0037] (2) adding toluene to the viscous polyamic acid solution prepared in step (1), warming up to 160° C. and refluxing with water for 4 hours, sinking the reaction solution into deionized water to form a precipitate; Filter, boil with boiling water, wash with ethanol, and dry in a vacuum drying oven at 70°C to o...
Embodiment 3
[0042] A preparation method of a high temperature resistant polyimide resin, the specific steps of the method are as follows:
[0043] (1) Under nitrogen protection, add 5.1638g (15mmol) of 1,2-bis(3-trifluoromethyl-4-aminobenzene)acetylene to a 500mL three-necked flask equipped with a magnetic stirring and a nitrogen leader, 2.0826g (10mmol) of 1,2-bis(4-aminophenyl)acetylene and 220ml of DMF, stir magnetically until completely dissolved; then add 8.8530g (25mmol) of 1,4-bis(trifluoromethyl)-2 , 3,5,6-benzenetetracarboxylic dianhydride, rinse the reactant powder hanging on the wall with 50ml of DMF, and stir the reaction at room temperature for 20 hours to obtain a viscous polyamic acid resin solution;
[0044] (2) adding toluene to the viscous polyamic acid solution prepared in step (1), warming up to 160° C. and refluxing with water for 6 hours, sinking the reaction solution into deionized water to form a precipitate; Filter, boil with boiling water, wash with ethanol, and...
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