A kind of self-healing polyurethane elastomer and its preparation method and application
A polyurethane elastomer, self-healing technology, applied in the direction of polyurea/polyurethane coatings, polyurea/polyurethane adhesives, adhesive types, etc., can solve the problems of difficult bond angle rotation, hindered local chain movement, etc., to achieve transparency Good, good compactness, small molecular weight effect
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Embodiment 1
[0028] Weigh 30g of polypropylene carbonate diol (PPC, molecular weight: 600g / mol) into a three-necked flask, vacuumize and stir for 2 hours at 120°C for dehydration. Dry processing. After the temperature of the reaction system drops to 80°C, add 4,4'-diphenylmethane diisocyanate, react at 60°C for 3 hours under the protection of nitrogen, then add N,N-dimethylformamide, and the temperature drops to 15 ℃, take 1,6-hexamethylenediamine and dissolve it in an appropriate amount of N,N-dimethylformamide, add the 1,6-hexamethylenediamine solution dropwise, and continue to stir at 15℃ for 8h until the reaction is complete to obtain polyurethane N,N- Dimethylformamide solution, pour the solution into a polytetrafluoroethylene mold, cure at room temperature for 8 hours, take out the sample and place it in a hot air oven at 70°C for 10 hours, and then place it at room temperature for a week to obtain the desired polyurethane material. In the above preparation process, the molar ratio ...
Embodiment 2
[0032] Weigh 30g of PPC (molecular weight: 2000g / mol) into a three-necked flask, vacuumize and stir at 120°C for 2h, and then pass through nitrogen protection, and then dry diethylene glycol. After the temperature of the reaction system drops to 80°C, add toluene diisocyanate, react at 80°C for 45 minutes under the protection of nitrogen, then add N,N-dimethylacetamide, drop the temperature to 20°C, and take diethylene diisocyanate Dissolve alcohol in an appropriate amount of N,N-dimethylacetamide, add diethylene glycol solution dropwise, then raise the temperature to 40°C and continue stirring for 8 hours to obtain a polyurethane N,N-dimethylacetamide solution. The solution was poured into a polytetrafluoroethylene mold, cured at room temperature for 12 hours, the sample strip was taken out and placed in a hot air oven at 50°C for 12 hours, and then placed at room temperature for a week to obtain the desired polyurethane material. In the above preparation process, the molar r...
Embodiment 3
[0036] Weigh 30g of PPC (molecular weight: 1000g / mol) into a three-neck flask, vacuumize and stir at 120°C for 2 hours, and then pass through nitrogen protection, and then dry 1,6-hexamethylenediamine. After the temperature of the reaction system drops to 80°C, add 4,4'-diphenylmethane diisocyanate, react at 85°C for 60 minutes under the protection of nitrogen, then add butyl acetate, the temperature drops to 20°C, and take 1,6 - Dissolve hexamethylenediamine in an appropriate amount of butyl acetate, add 1,6-hexamethylenediamine solution dropwise, then raise the temperature to 40°C and continue stirring for 8 hours to obtain a polyurethane butyl acetate solution, pour the solution into polytetrafluoroethylene In the mold, cure at room temperature for 12 hours, take out the sample and place it in a hot air oven at 70°C for 10 hours, and then place it at room temperature for a week to obtain the desired polyurethane material. In the above preparation process, the molar ratio of...
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