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Regenerated cellulose ultrafiltration membrane and preparation method thereof

A technology of regenerated cellulose and ultrafiltration membrane, applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of large solvent consumption, long process flow, poor membrane performance, etc., and achieve good hydrophilic performance , The film-making process is simple and the compatibility is good

Inactive Publication Date: 2016-04-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional cellulose membrane is prepared by the viscose method and the cuproammonia method, which has a long process flow, consumes a large amount of solvent, causes great pollution and poor performance of the prepared membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] At 80°C, 1 g of absorbent cotton with a degree of polymerization of 1200 and an α-cellulose content of 98 wt%, 0.5 g of PVP-K90, 0.05 g of sodium lauryl sulfate, 0.02 g of propyl gallate and 18.43 g of 15 wt% water Mix the NMMO, stir it evenly to make it dissolve, it takes about 1h, and get 5wt% cellulose casting solution after defoaming and filtering; cast the casting solution on a glass plate at 70°C to form a flat film, and then cast the casting solution on a glass plate The membrane was placed in 25°C, 90%RH air for 100s, then solidified in NMMO containing 50wt% water at 10°C for 3min, took out the water and washed it, soaked the membrane with 50wt% glycerin aqueous solution for 3h, and then put the membrane in air at room temperature After drying, the regenerated cellulose flat ultrafiltration membrane is obtained. The water flux of the membrane is 583L / m 2 h, the rejection rate of 1% bovine serum albumin is 95.5%.

Embodiment 2

[0033] At 100 °C, 30 g of bamboo pulp with a degree of polymerization of 500 and an α-cellulose content of 98.6 wt%, 9 g of PEG200, 1 g of Tween 80, 2 g of propyl gallate and 158 g of NMMO containing 5 wt% of water were mixed and stirred evenly It takes about 2 hours to dissolve it, and after degassing and filtering, a 15wt% cellulose casting solution is obtained; at 78°C, the casting solution and deionized water are co-extruded into a tubular film through a spinneret, and the film is After passing through a 15cm argon air gap (25°C, 60%RH), solidify in NMMO containing 10wt% water at 50°C; soak the film with 10wt% glycerol aqueous solution for 24h after washing, and then dry the film in air at room temperature Dry the regenerated cellulose hollow fiber ultrafiltration membrane. The water flux of the membrane is 364L / m 2 h, the rejection rate of 1% bovine serum albumin is 99%.

Embodiment 3

[0035] At 90°C, 20 g of wood pulp with a degree of polymerization of 892 and an α-cellulose content of 99.2 wt%, 6.4 g of PVP-K30, 1.6 g of Tween 85, 1 g of propyl gallate and 171 g of NMMO with a water content of 10 wt% were mixed , Stir evenly to dissolve it, it takes about 1.5h, after degassing and filtering, 10wt% cellulose casting solution is obtained; at 75°C, the casting solution and NMMO (core solution) containing 20wt% water are sprayed The plates are co-extruded into a tubular film, which is immediately put into NMMO containing 30wt% water at 30°C for solidification and forming; after washing with water, the film is soaked in 30wt% glycerin aqueous solution for 15h, and then the film is air-dried at room temperature to obtain a regenerated Cellulose hollow fiber ultrafiltration membrane. The water flux of the membrane is 432L / m 2 h, the rejection rate of 1% bovine serum albumin is 98%.

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Abstract

The invention relates to a regenerated cellulose ultrafiltration membrane and a preparation method thereof. The regenerated cellulose ultrafiltration membrane includes a regenerated cellulose hollow fiber ultrafiltration membrane and a regenerated cellulose flat ultrafiltration membrane, and NMMO containing 5 to 15 wt% of water is used as the The solvent directly dissolves the cellulose pulp and additives, and then the regenerated cellulose ultrafiltration membrane is spun by the immersion gel phase inversion method. The present invention adds a polymer pore-forming agent and a surfactant to the preparation of the regenerated cellulose casting solution, and through the combination of the polymer pore-forming agent and the surfactant, the pore structure of the ultrafiltration membrane is synergistically regulated, and the ultrafiltration membrane is improved. Water flux, the surfactant used has good compatibility with the coagulation bath, can inhibit the formation of large cavities, and is easy to prepare ultrafiltration membranes with high mechanical strength. The regenerated cellulose ultrafiltration membrane prepared by the invention has good hydrophilicity and wide application, and is suitable for liquid separation such as oil-water separation, artificial kidney dialysis membrane, sewage treatment in printing and dyeing factories, pressing wastewater in viscose fiber production process, papermaking wastewater treatment, etc. .

Description

technical field [0001] The invention relates to a regenerated cellulose ultrafiltration membrane and a preparation method thereof. Background technique [0002] Cellulose is the most abundant natural polymer on earth. Plants can produce hundreds of millions of tons of cellulose every year through photosynthesis. As a membrane material, cellulose has the advantages of degradability, low cost, good film-forming performance, good biocompatibility, and stable physical and chemical properties. The traditional cellulose membrane is prepared by the viscose method and the cuproammonia method, which has a long process, consumes a large amount of solvent, causes a lot of pollution, and the performance of the prepared membrane is poor. [0003] In recent years, people have devoted themselves to the study of new solvent systems suitable for cellulose dissolution, such as ionic liquids, LiCl / DMAC, PF / DMF, NH 3 / NH 4 SCN, NMMO / H 2 O etc., currently NMMO / H 2 O is the most important ne...

Claims

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Application Information

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IPC IPC(8): B01D71/10B01D69/06B01D69/08B01D67/00
Inventor 汪前东刘必前何敏
Owner INST OF CHEM CHINESE ACAD OF SCI
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