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Process for preparing poly acrylic acid-poly glycol/cellulose acetate composite film

A technology of cellulose acetate and polyethylene glycol, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems that do not involve polyacrylic acid and polyethylene glycol, etc. control, cheap and easily available reagents, simple and safe operation

Inactive Publication Date: 2007-04-11
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] None of the relevant literature involves the blending of polyacrylic acid and polyethylene glycol, and the composite of binary blends and cellulose acetate porous membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] First, make the blending of polyacrylic acid-polyethylene glycol (PAA-PEG) and the preparation of casting solution

[0043] 1 liter concentration is 5wt% polyacrylic acid (PAA) aqueous solution and 1 liter concentration is the polyethylene glycol (PEG) aqueous solution of 3wt% uniformly mixes and blends, blending ratio PEG: PAA is 1: 5; Ethylene glycol (EG) and 1.0 wt% aluminum nitrate [Al(NO 3 ) 3 ] solution, mixed at room temperature (about 25° C.) to prepare a casting solution, and allowed to stand for defoaming;

[0044] Secondly, the preparation of polyacrylic acid-polyethylene glycol / cellulose acetate (PAA-PEG / CA) composite film

[0045] Soak the CA support membrane in water for 2 hours, take it out and rinse it with running water, then place it in a closed cabinet to dry in the shade, then fix it on a glass plate, pour the casting solution evenly on one end of the support membrane, and then use a scraper to slowly and uniformly Scrape to form a gel film;

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Embodiment 2

[0051] As in the process steps of Example 1, wherein the concentrations of PAA and PEG are 9wt% and 1wt%, respectively, the blending ratio of PEG:PAA is 3:5, and the crosslinking agent ethylene glycol is 1wt% and aluminum nitrate is 1.0wt%. The composite film that has been dried by an infrared lamp is then heat-treated at 170° C. for 1 hour, and finally a composite film product is obtained. At this time, the PV separation performance of the composite membrane for the DMC / water mixture is: permeation flux 113.95g / m 2 • h, separation factor 94.41.

Embodiment 3

[0053] As in the process steps of Example 1, wherein the concentrations of PAA and PEG are 7wt% and 5wt% respectively, the blending ratio PEG: PAA is 5:5, crosslinking agent ethylene glycol 2wt% and aluminum nitrate 0.5wt%; The composite film dried by the infrared lamp is then heat-treated at 150° C. for 1 hour, and finally the finished product of the composite film is obtained. At this time, the permeation flux of the composite membrane is 110.38g / m 2 • h, separation factor 85.01.

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Abstract

The preparation process of polyacrylic acid-polyethylene glycol / cellulse acetate (PAA-PEG / CA) composite film is the application of film casting process in preparing composite film. Film casting solution is first prepared through mixing water solution of PAA PEG and adding ethylene glycol and aluminum nitrate as the cross linking agent; and then cast to the surface of supporting porous CA film at room temperature; and the PAA-PEG gel film on the CA film is finally dried and heat treated to obtain the PAA-PEG / CA composite film. The PAA-PEG / CA composite film is used in the permeating vaporization separation of water mixture with dimethyl carbonate in 90 wt% in the conditions of room temperature and downstream vacuum degree of 300-600 Pa, and can reach excellent separation of permeation flux of 96.30-313.74g / sq m.hr and separation factor of 52.06-1602.17. The present invention has simple preparation process, facile material and easy operation and control, and suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a composite membrane. Specifically, the separation layer of the composite membrane is a blend of two polymers, polyacrylic acid (PAA)-polyethylene glycol (PEG), and the support layer material is a cellulose acetate (CA) porous membrane. PAA-PEG / CA composite membrane is mainly used for the separation of dimethyl carbonate water mixture and other organic matter water mixture. Background technique [0002] Polyacrylic acid (PAA) is a hydrophilic polymer and is an excellent material for preparing separation membranes. PAA has the characteristics of high molecular weight and high charge density, and can form a separation membrane with good mechanical properties through the cross-linking ability of carboxyl groups and cross-linking agents or other polymers. PAA membranes and their modified membranes are widely used in pervaporation (PV), reverse osmosis (RO) and ultrafiltration (U...

Claims

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Application Information

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IPC IPC(8): B01D69/12
Inventor 蔡邦肖
Owner ZHEJIANG GONGSHANG UNIVERSITY
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