A preparation method of regenerated cellulose-based cross-linked modified nanofiltration membrane

A technology of regenerated cellulose and cross-linking modification, which is applied in the field of preparation of natural polymer materials, can solve the problems of low utilization rate, poor utilization benefit, and low profit margin, and achieve low cost, large water flow, and high added value Effect

Active Publication Date: 2019-08-13
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's timber resources, forestry "three leftovers" and "secondary, small, and firewood" resources are very rich, but the utilization rate is relatively low, the utilization efficiency is poor, and the profit rate is low

Method used

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Examples

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Effect test

preparation example Construction

[0022] A kind of preparation method of regenerated cellulose-based cross-linked modified nanofiltration membrane of the present invention, it comprises following specific operation steps:

[0023] (1) Preparation of cellulose casting solution: in an oil bath at 70-130°C, configure N-methylmorpholine-N-oxide (NMMO) solvent with a water content of 5-15%, and then add N-propyl gallate is used as an antioxidant, and the addition amount of n-propyl gallate is 0.1-1% of the total mass of the cellulose casting solution, and then the cellulose dissolving pulp is added, and N-methylmorpholine-N-oxide The mass ratio of solvent to cellulose dissolving pulp is 100:1-6:1, then it is stirred by magnetic force until it is completely dissolved, and then vacuumized for degassing or standing for 5-8 hours to obtain a uniform and transparent cellulose casting solution ,stand-by;

[0024] (2), immersion gel film making method: under the constant temperature condition of 60-110 ℃, use water to ad...

Embodiment 1

[0030] Preparation of cellulose casting solution: under the condition of 130°C in an oil bath, configure NMMO solvent with a water content of 10%, then add n-propyl gallate as an antioxidant, and the amount of n-propyl gallate added is 0.8% of the total mass of the film solution, then add cellulose dissolving pulp, and the mass ratio of NMMO solvent to cellulose dissolving pulp is 100:1, then stir it by magnetic force until it is completely dissolved, the stirring speed is 200r / min, and then vacuumize and remove Soak for 5-8 hours to obtain a uniform and transparent cellulose casting solution, which is ready for use;

[0031] Immersion gel film production: under the condition of constant temperature of 90°C, adjust the mass concentration of cellulose casting solution to 5%, and then evenly coat the adjusted cellulose casting solution on the non-woven fabric to obtain a cellulose primary film and then soak the obtained cellulose primary film in deionized water at room temperatu...

Embodiment 2

[0034] Preparation of cellulose casting liquid: under the condition of 70°C in an oil bath, configure NMMO solvent with a water content of 15%, then add n-propyl gallate as an antioxidant, and the amount of n-propyl gallate added is 0.1% of the total mass of the film solution, then add cellulose dissolving pulp, and the mass ratio of NMMO solvent to cellulose dissolving pulp is 50:1, then stir it by magnetic force until it is completely dissolved, the stirring speed is 400r / min, and then let stand to remove Soak for 5-8 hours to obtain a uniform and transparent cellulose casting solution, which is ready for use;

[0035] Immersion gel film production: under constant temperature conditions of 60°C, adjust the mass concentration of the cellulose casting solution to 10%, and then evenly coat the adjusted cellulose casting solution on the non-woven fabric to obtain a cellulose primary film and then soak the obtained cellulose primary film in deionized water at room temperature for...

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Abstract

The invention provides a preparation method of a regenerated cellulose based cross-linked modified nanofiltration membrane. The preparation method comprises the following steps: firstly, producing a cellulose membrane casting solution by adopting NMMO (N-methylmorpholine-N-oxide), propyl gallate and a cellulose membrane casting solution; secondly, preparing a regenerated cellulose membrane by adopting an immersion gel method, wherein the thickness of the membrane is 2mu m to 50mu m; then, preparing an ALG / CMC blended solution; taking the prepared regenerated cellulose membrane as a basic membrane and uniformly coating the basic membrane with the ALG / CMC (sodium alginate / carboxymethylcellulose sodium) blended solution; carrying out air drying for 12h to 36h at room temperature to obtain a composite cellulose membrane; immersing the obtained composite cellulose membrane into an epichlorohydrin ethanol solution and regulating the pH (Potential of Hydrogen) of the system to 9 to 12; carrying out cross-linking reaction for 4h to 24h under the condition that the temperature is 30 DEG C to 70 DEG C, so as to obtain the regenerated cellulose based cross-linked modified nanofiltration membrane. The preparation method provided by the invention has the advantages of simple preparation process, cheap raw materials and wide sources; the prepared regenerated cellulose based cross-linked modified nanofiltration membrane has the characteristic of high additional value and environment friendliness.

Description

[0001] 【Technical field】 [0002] The invention relates to a preparation method of a natural polymer material, in particular to a preparation method of a regenerated cellulose-based cross-linked modified nanofiltration membrane. [0003] 【Background technique】 [0004] Membrane technology is an important new high-tech in the 21st century. Membrane technologies that are mature and under development include dialysis, reverse osmosis, microfiltration, ultrafiltration, nanofiltration, fuel cells, electrodialysis, artificial kidney, gas separation, Chlor-alkali industry Membrane electrolysis, inorganic membrane, pervaporation, liquid membrane, controlled release, membrane contactor, membrane reactor and biofilm, etc. Because membrane separation technology has the functions of separation, concentration, purification and refining, and has the characteristics of high efficiency, energy saving, environmental protection, molecular level filtration and simple filtration process, easy to c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/22B01D67/00B01D61/00C02F1/44
Inventor 肖禾李诗曹石林吴慧陈礼辉黄六莲
Owner FUJIAN AGRI & FORESTRY UNIV
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