A method for preparing poly(urea-imide) cross-linked and cured by cage-type silsesquioxane
A technology of silsesquioxane and imide, which is applied in the direction of coating, etc., can solve the problem of few high-temperature-resistant materials, and achieve the effects of short reaction cycle, excellent mechanical properties, and improved heat resistance
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Embodiment 1
[0024] Weigh 8g of isophorone diisocyanate into a three-necked flask, and add 2mL of N,N-dimethylformamide as a solvent. Weigh 10.53g of amino-terminated polyether (molecular weight 600) and dissolve it in 20mL of N,N-dimethylformamide, add it to the isophorone diisocyanate solution, mix and stir evenly under nitrogen protection, and react at room temperature for 2 hours. Weigh 1.91g of pyromellitic anhydride and add it to the above reaction solution, drop into 9mL of triethylamine catalyst (drop three times, once every 6 hours), raise the temperature to 85°C, react for 24 hours under nitrogen protection, and use saturated lime CO produced by the water detection reaction 2 , to determine whether the reaction is complete. To be free of CO 2 After release, stop the reaction. Take 20g of the reaction solution, add 1.24g of highly reactive octaphenylamino cage silsesquioxane under stirring, continue stirring with a magnetic force for 30min, let it stand for a while, and pour th...
Embodiment 2
[0026] Weigh 8g of isophorone diisocyanate into a three-necked flask, and add 2mL of N,N-dimethylformamide as a solvent. Weigh 10.8g of amino-terminated polyether (molecular weight 600) and dissolve it in 20mL of N,N-dimethylformamide, add it to the isophorone diisocyanate solution, mix and stir evenly under nitrogen protection, and react at room temperature for 2 hours. Weigh 1.96g of pyromellitic anhydride and add it to the above reaction solution, drop into 9mL of triethylamine catalyst (drop three times, once every 6 hours), raise the temperature to 85°C, react for 24 hours under nitrogen protection, and use saturated lime CO produced by the water detection reaction 2 , to determine whether the reaction is complete. To be free of CO 2 After release, stop the reaction. Take 20g of the reaction solution, add 1.3g of highly reactive octaphenylamino cage silsesquioxane under stirring, continue stirring with a magnetic force for 30min, let it stand for a while, and pour the ...
Embodiment 3
[0028] Weigh 8g of isophorone diisocyanate into a three-necked flask, and add 2mL of N,N-dimethylformamide as a solvent. Weigh 35.11g of amino-terminated polyether (molecular weight: 2000) and dissolve it in 70mL of N,N-dimethylformamide, add it to the isophorone diisocyanate solution, mix and stir evenly under the protection of nitrogen, and react at room temperature for 2 hours. Weigh 1.91g of pyromellitic anhydride and add it to the above reaction solution, drop into 9mL of triethylamine catalyst (drop three times, once every 6 hours), raise the temperature to 85°C, react for 24 hours under nitrogen protection, and use saturated lime CO produced by the water detection reaction 2 , to determine whether the reaction is complete. To be free of CO 2After release, stop the reaction. Take 40g of the reaction solution, add 1.01g of highly reactive octaphenylamino cage silsesquioxane under stirring, continue stirring with a magnetic force for 30min, let it stand for a while, and...
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