Preparation method for cellulose acetate modified lignin polyurethane film
A polyurethane film and cellulose acetate technology, which is applied in the field of lignin application, can solve the problems of restricting the scope of industrial application, and some properties of lignin polyurethane film cannot reach the performance of ordinary polyurethane film, so as to improve mechanical properties and hydrophilic properties , Reduce dependence on petroleum resources, good hydrophilic effect
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Embodiment 1
[0049] Weigh 4 g of enzymatic lignin and dissolve it in a mixed solvent of 40 mL of acetone and 60 mL of DMF, add 16 g of PEG1000 and stir at 60 °C for 0.5 h to make it fully mixed. Add 6.53 g of TDI, stir, seal the reaction at 75°C for 1 h, then pour it into a polytetrafluoroethylene mold, place the mold on a horizontal platform, and let it stand for 24 h, put the obtained film in an oven After drying at 80°C for 3 hours, soak in water at room temperature for 24 hours, and finally put it in an oven at 120°C for 3 hours for further aging, take out the membrane (LPU), and put it in a vacuum drying oven for evaluation of its various properties. Further testing.
[0050]
Embodiment 2
[0052] 4 g of enzymatic lignin and 1 g of cellulose acetate were weighed and dissolved in a mixed solvent of 40 mL of acetone and 60 mL of DMF, and 15 g of PEG1000 was added and stirred at 60 °C for 0.5 h to make it fully mixed. Add 6.59 g of TDI, stir, seal the reaction at 75°C for 1 h, pour it into a polytetrafluoroethylene mold, place the mold on a horizontal platform, and let it stand for 24 h. Put the obtained film in an oven After drying at 80°C for 3 hours, soak in water at room temperature for 24 hours, and finally put it in an oven at 120°C for 3 hours for further aging, take out the membrane (LPU-CA1), and put it in a vacuum drying oven for various performance for further testing.
[0053]
Embodiment 3
[0055] 4 g of enzymatic lignin and 2 g of cellulose acetate were weighed and dissolved in a mixed solvent of 40 mL of acetone and 60 mL of DMF, and 14 g of PEG1000 was added and stirred at 60 °C for 0.5 h to make it fully mixed. Add 6.64 g of TDI, stir, seal the reaction at 75 ° C for 1 h, pour it into a polytetrafluoroethylene mold, place the mold on a horizontal platform, and let it stand for 24 h. Put the obtained film in an oven After drying at 80°C for 3 hours, soak in water at room temperature for 24 hours, and finally put it in an oven at 120°C for 3 hours for further aging, take out the membrane (LPU-CA2), and put it in a vacuum drying oven for various performance for further testing.
[0056]
PUM
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