Sulfonated dihydroxypropyl chitosan modified polyurethane (SDHPCS-PU) hemodialysis membrane and preparation method thereof
A technology of sulfonated dihydroxypropyl chitosan and hemodialysis, which is applied in the field of biomedical materials, can solve the problems of blood compatibility that needs to be further improved, and achieve excellent blood compatibility, mild and controllable conditions, and easy industrialization effect
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Embodiment 1
[0026] Put 18% of sulfonated dihydroxypropyl chitosan modified polyurethane and 82% of N,N-dimethylformamide into the dissolution kettle with thermometer, stirrer and reflux condensing device, control the temperature at 80°C, and stir 15h; after the dissolution is complete, let it stand for 20h to complete the defoaming and obtain the membrane liquid;
[0027] Open the nitrogen valve, control the pressure of the raw material kettle to 0.08MPa, filter the spinning membrane liquid, pump the core liquid into the inner hole of the spinneret through the metering pump and extrude it, control the flow rate of the core liquid to 1.2mL / min, and the flow rate of the core liquid After stabilization, start spinning; the membrane liquid is pressed into the annulus of the spinneret and extruded, the spinning speed is controlled at 1.5mL / min, and the primary spun fiber is extruded 25cm in the air and then cooled in a coagulation water bath at a temperature of 30°C Cured, then passed through ...
Embodiment 2
[0029] Add 15% of sulfonated dihydroxypropyl chitosan modified polyurethane and 85% of N,N-dimethylformamide into a dissolution kettle equipped with a thermometer, agitator and reflux condensing device, control the temperature at 80°C, and stir 20h; after the dissolution is complete, let it stand for 20h to complete the defoaming and obtain the membrane liquid;
[0030] Open the nitrogen valve, control the pressure of the raw material kettle to 0.08MPa, filter the spinning membrane liquid, pump the core liquid into the inner hole of the spinneret through the metering pump and extrude it, control the flow rate of the core liquid to 1.2mL / min, and the flow rate of the core liquid After stabilization, start spinning; the membrane liquid is pressed into the annulus of the spinneret and extruded, the spinning speed is controlled at 1.5mL / min, and the primary spun fiber is extruded 25cm in the air and then cooled in a coagulation water bath at a temperature of 30°C Cured, then passe...
Embodiment 3
[0032] Put 17% of sulfonated dihydroxypropyl chitosan modified polyurethane and 83% of N,N-dimethylformamide into the dissolution kettle with thermometer, stirrer and reflux condensing device, control the temperature at 85°C, and stir 20h; after the dissolution is complete, let it stand for 20h to complete the defoaming and obtain the membrane liquid;
[0033] Open the nitrogen valve, control the pressure of the raw material kettle to 0.08 MPa, filter the spinning membrane liquid, pump the core liquid into the inner hole of the spinneret through the metering pump and extrude it, control the flow rate of the core liquid to 1.3mL / min, and the flow rate of the core liquid After stabilization, start spinning; the membrane liquid is pressed into the annulus of the spinneret and extruded, the spinning speed is controlled at 1.5mL / min, and the primary spun fiber is extruded 25cm in the air and then cooled in a coagulation water bath at a temperature of 30°C Cured, then passed through...
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