Hollow internal-pressing fiber film and preparation method thereof

Abstract

The invention discloses a hollow internal-pressing fiber film and a preparation method thereof, and provides a hollow internal-pressing fiber film with uniform large hole diameter and a through hole structure and a preparation method of the hollow internal-pressing fiber film. The preparation method includes stirring 5-15% of polyether sulfone resin, 1-5% of ultra-high molecular weight polyacrylonitrile resin, 75-80% of solvent, 1-5% of micromolecule additives, 1-5% of polymeric additives and liquid pore-forming agents at the temperature of 50-80 DEG C for dissolution, evenly mixing, and obtaining film casting liquor after removing of bubbles; extruding the film casting liquor by a spinneret plate, subjecting the film casting liquor to a coagulating bath at the temperature of 10-70 DEG C, and obtaining raw silks of the hollow internal-pressing fiber film after completion of gelling. Through determination of polyether sulfone resin / polyacrylonitrile resin blending ratio, solid content, additive types and concentration, the polyether sulfone hollow internal-pressing fiber film with the through hole structure and the uniform large hole diameter can be obtained.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to a hollow fiber internal pressure membrane and a preparation method thereof. Background technique [0002] With the development of separation technology, membrane technology has begun to be used in high-concentration and high-viscosity liquid separation fields such as recovery of bacteria (such as yeast, etc.), fruit juice concentration, etc., especially hollow fiber membrane technology. With the characteristics of low power consumption and simple equipment operation, it has gradually become the core technology in this field. Due to the relatively large volume of bacteria (such as yeast, etc.) and pulp cells, the existing conventional hollow fiber ultra / microfiltration membranes cannot be fully applied, and generally have small pore diameters (resulting in low filtration efficiency) and high tortuous pore structures. It leads to low operating efficiency of equipment and limited...

AI Technical Summary

Problems solved by technology

Due to the relatively large volume of bacteria (such as yeast, etc.) and pulp cells, the existing conventional hollow fiber ultra / microfiltration membranes cannot be fully applied, and generally have small pore diameters (resulting in low filtration efficiency) and high tortuous pore structures. The problems that lead to low equipment operation efficiency and limited maintenance and cleaning methods are not suitable for use in high-concentration and high-viscosity environments

[0003] Polyethersulfone resin (PES) is a thermoplastic polymer material with excellent comprehensive properties developed by the British ICI company in 1972. The molecule has the rigidity of the benzene ring, the flexibility of the ether group, and the formation of the sulfone group and the entire structural unit. Large conjugated system, so the whole molecule has considerable stability, good chemical and biological corrosion resistance, outstanding hydrolysis resistance stability and radiation resistance, etc., but the pore size of the PES hollow fiber membrane is generally small, and the hollow fiber membrane produced It is not suitable for the separation of high-concentration and high-viscosity liquids such as the recovery of bacteria (such as yeast, etc.) and the concentration of fruit juice.

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