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Composite ultrafiltration film and preparation method thereof

A technology of ultrafiltration membrane and composite plasticizer, which is applied in the direction of chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of high economic cost, prolong service life, reduce pore size, and facilitate polymerization The effect of crosslinking

Active Publication Date: 2012-07-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, cellulose acetate is mainly used to industrially prepare ultrafiltration membranes, and the economic cost is relatively high.

Method used

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  • Composite ultrafiltration film and preparation method thereof
  • Composite ultrafiltration film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] ①Preparation of modified materials: Weigh 34g of refined cotton fiber and cornstarch with a mass ratio of 3:2 and place them in a three-necked flask. The three-necked flask is connected to a stirrer and placed in a constant temperature water bath. Then add 15ml of sulfuric acid solution as a catalyst, wherein the sulfuric acid solution is prepared in advance by concentrated sulfuric acid and distilled water in a volume ratio of 1:1.5. Adjust the temperature of the water bath to 80°C, the stirring speed to 500r / min, and react for about 4 hours to obtain a brown solution. Adding distilled water to the brown solution for repeated washing and suction filtration to obtain modified cellulose and starch materials, which are vacuum-dried for later use.

[0034] ② Prepare ultrafiltration membrane casting solution: dissolve the prepared modified cellulose and starch materials in acetone, use dibutyltin dilaurate as the initiator, and add 0.5% of the total mass of the casting solu...

Embodiment 2

[0048] ①Preparation of modified materials: Weigh 34g of refined cotton fiber and potato starch with a mass ratio of 1:1 and place them in a three-necked flask. The three-necked flask is connected to a stirrer and placed in a constant temperature water bath. Then add 15ml of sulfuric acid solution as a catalyst, wherein the sulfuric acid solution is prepared in advance by concentrated sulfuric acid and distilled water in a volume ratio of 1:1.5. Adjust the temperature of the water bath to 80°C, the stirring speed to 500r / min, and react for about 4 hours to obtain a brown solution. Adding distilled water to the brown solution for repeated washing and suction filtration to obtain modified cellulose and starch materials, which are vacuum-dried for later use.

[0049] ② Prepare ultrafiltration membrane casting solution: dissolve the prepared modified cellulose and starch materials in acetone, use dibutyltin dilaurate as the initiator, and add 0.5% of the total mass of the casting s...

Embodiment 3

[0062] ①Preparation of modified materials: Weigh 34g of refined cotton fiber and wheat starch with a mass ratio of 7:3 and place them in a three-necked flask. The three-necked flask is connected to a stirrer and placed in a constant temperature water bath. Then add 15ml of sulfuric acid solution as a catalyst, wherein the sulfuric acid solution is prepared in advance by concentrated sulfuric acid and distilled water in a volume ratio of 1:1.5. Adjust the temperature of the water bath to 80°C, the stirring speed to 500r / min, and react for about 4 hours to obtain a brown solution. Adding distilled water to the brown solution for repeated washing and suction filtration to obtain modified cellulose and starch materials, which are vacuum-dried for later use.

[0063] ② Prepare ultrafiltration membrane casting solution: dissolve the prepared modified cellulose and starch materials in acetone, use dibutyltin dilaurate as the initiator, and add 0.5% of the total mass of the casting so...

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Abstract

The invention discloses a composite ultrafiltration film and a preparation method thereof. The preparation method comprises the following steps: 1, carrying out an acetylation reaction on natural celluloses and starch to prepare cellulose acetate and starch acetate; 2, dissolving cellulose acetate and starch acetate in a solvent acetone, adding an initiator, a plasticizer and a hydrophilic modifier to prepare an ultrafiltration film casting liquid; 3, preparing a polysulfone porous support film through a phase conversion process; and 4, directly immersing the support film in the ultrafiltration film casting liquid, taking out, naturally evaporating, and solidifying through carrying out secondary thermodynamic processing to form a composite ultrafiltration structure with an internal porous support layer and a surface double-layer ultrafiltration layer. The composite ultrafiltration film prepared in the invention has good mechanical performances and chemical stable performances and can be partially biodegraded, the influence of the composite ultrafiltration film to the environment is reduced, and reasonable and effective utilizations of the natural celluloses and starch are realized.

Description

technical field [0001] The invention relates to the field of methods for preparing ultrafiltration membranes from modified cellulose and starch, in particular to a method for preparing high-strength partially biodegradable composite ultrafiltration membranes. Background technique [0002] Ultrafiltration is a membrane separation process, which is a separation process in which colloids, large particles and relatively high molecular weight substances in water are retained under external pressure, while water and small solute particles pass through the membrane. Ultrafiltration membranes can be made into flat membranes, roll membranes, tubular membranes or hollow fiber membranes, and are widely used in seawater desalination, industrial sewage treatment, drinking water supply terminals, pharmaceutical industry, food industry and other fields. [0003] Ultrafiltration membrane (UF) is generally a polymer separation membrane. The polymer materials used for ultrafiltration membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/12B01D69/10B01D67/00
Inventor 黄少斌张瑞峰吴文清
Owner SOUTH CHINA UNIV OF TECH
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