Preparation method of high-strength self-repairing polyurethane
A self-healing and operating method technology, applied in the field of smart materials, can solve problems such as shortening the service life of materials, decreasing mechanical properties and stability, and difficult to observe cracks
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Embodiment 1
[0024] Weigh 5g of polypropylene glycol and 1.785g of small molecule chain extender containing furan group in a three-necked flask, then add 2.94g of liquefied MDI, catalyst dibutyltin dilaurate and a little solvent tetrahydrofuran, place the three-necked flask in an oil bath pot The magnetic stirring was turned on, nitrogen was introduced, and the temperature was slowly raised to 60 °C for 5 h. After 5 hours, 0.896 g of bismaleimide was dissolved in THF and injected into the three-necked flask with a syringe, and the reaction was continued at 60° C. for 24 hours. After the reaction is completed, turn off the heating and stop stirring, pour the mixed liquid into a polytetrafluoroethylene mold, place the product in a fume hood for 72 hours to evaporate most of the solvent, and then dry it in a vacuum oven at 60°C for 24 hours to obtain a polyurethane dry film PU-DA-1. The sample was cut into a dumbbell shape, cut from the middle, placed at 120°C for 40min, and at 60°C for 24h ...
Embodiment 2
[0026] Weigh 4g of polypropylene glycol and 2.142g of small molecule chain extender containing furan group in a three-necked flask, then add 2.94g of liquefied MDI, catalyst dibutyltin dilaurate and a little solvent tetrahydrofuran, place the three-necked flask in an oil bath pot The magnetic stirring was turned on, nitrogen was introduced, and the temperature was slowly raised to 60 °C for 5 h. After 5 hours, 1.075 g of bismaleimide was dissolved in THF and injected into the three-necked flask with a syringe, and the reaction was continued at 60° C. for 24 hours. After the reaction is completed, turn off the heating and stop stirring, pour the mixed liquid into a polytetrafluoroethylene mold, place the product in a fume hood for 72 hours to evaporate most of the solvent, and then dry it in a vacuum oven at 60°C for 24 hours to obtain a polyurethane dry film PU-DA-1.5. The sample was cut into a dumbbell shape, cut from the middle, placed at 120°C for 40min, and at 60°C for 24...
Embodiment 3
[0028] Weigh 3.333g of polypropylene glycol and 2.380g of small molecule chain extender containing furan group in a three-necked flask, then add 2.94g of liquefied MDI, catalyst dibutyltin dilaurate and a little solvent tetrahydrofuran, place the three-necked flask in an oil bath pot Magnetic stirring was turned on in the medium, nitrogen was introduced, and the temperature was slowly raised to 60 °C for 5 h. After 5 hours, 1.195 g of bismaleimide was dissolved in THF and injected into the three-necked flask with a syringe, and the reaction was continued at 60° C. for 24 hours. After the reaction is completed, turn off the heating and stop stirring, pour the mixed liquid into a polytetrafluoroethylene mold, place the product in a fume hood for 72 hours to evaporate most of the solvent, and then dry it in a vacuum oven at 60°C for 24 hours to obtain a polyurethane dry film PU-DA-2. The sample was cut into a dumbbell shape, cut from the middle, placed at 120°C for 40min, and at...
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