Medical dialysis paper and preparation method thereof

Abstract

A high-toughness sheath-core fiber, medical dialysis paper, and a preparation method thereof are provided. According to the present disclosure, a certain proportion of cellulose nanofibers are added to the polyethylene sheath layer and the polypropylene core layer respectively for melt blending to obtain a sheath component and a core component, then coaxial melt electrospinning is performed to obtain the high-toughness sheath-core fiber. The high-toughness sheath-core fiber is added to the raw materials of the medical dialysis paper at a mass ratio of 2-20%. After wet papermaking, the sheath layer of the fiber is melt-bonded using a hot-pressing method, which allows the substances between the sheath layers to melt and mix, improving the paper strength. The prepared medical dialysis paper exhibits excellent antibacterial property.

What is claimed is: 
     
         1 . 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. 
 
     
     
         2 . The method for preparing medical dialysis paper according to  claim 1 , wherein the length of the cellulose nanofibers is 5-20 nm. 
     
     
         3 . Medical dialysis paper prepared by the preparation method of  claim 1 .