Medical dialysis paper and preparation method thereof

A method for preparing medical dialysis paper, wherein high-toughness sheath-core fibers are added to plant fiber raw materials at 15-20% of the total mass, and after fiber dispersion, inclined wire forming, pressing, and drying, hot pressing and cold air treatment are conducted at 135-140° C. to obtain the medical dialysis paper;

• a method for preparing the high-toughness sheath-core fibers comprises the following steps:
• S1, melt-blending cellulose nanofibers with polyethylene at a mass ratio of 1:4 to obtain a sheath component;
• S2, melt-blending cellulose nanofibers with polypropylene at a mass ratio of 1:4 to obtain a core component;
• S3, adding the sheath component to melting channel A, adding the core component to melting channel B, performing coaxial melt electrospinning to obtain the high-toughness sheath-core fiber;
• in the step S1, the cellulose nanofibers are melt-blended with polyethylene in an internal mixer at 130° C. and 50 r/min for 5-10 minutes;
• in the step S2, the cellulose nanofibers are melt-blended with polypropylene in an internal mixer at 170° C. and 50 r/min for 5-10 minutes;
• in the step S3, 25 wt % of the sheath component is added to the melting channel A, and 75 wt % of the core component is added to the melting channel B, and coaxial melt electrospinning is performed, wherein, the temperature of the melting channel A is set to 140° C., and the temperature of the melting channel B is set to 180° C., coaxial needles with an inner diameter of 22 G and an outer diameter of 16 G are used as spinning needles;
• the melt electrospinning process conditions are as follows:
• voltage:
• 25-40 kV, spinning distance:
• 25-30 cm, roller speed:
• 200-800 r/min, propulsion speed:
• 0.4-0.8 mL/h.