Automatic assembling device and method of multilayer composite separation membrane

[0044] The support body is polyacrylonitrile (PAN) material, flat ultrafiltration membrane, the molecular weight cut off is 20000, and the membrane area is 92cm 2 , the polycation material used is polyethyleneimine (PEI, molecular weight is 60,000), polyanion is polyacrylic acid (PAA, molecular weight is 4 million), and the solvent of polyethyleneimine and polyacrylic acid is deionized water.

[0045] Assembly conditions and methods:

[0046] (1) polyethyleneimine is made into 0.125wt% solution 2000ml with deionized water, is mixed with polycation solution through stirring, ultrasonic deaeration; With deionized water, polyacrylic acid is made into 0.025wt% solution 2000ml, through Stirring, ultrasonic defoaming to prepare polyanion solution;

[0047] (2) In order to charge the surface of the polyacrylonitrile-based membrane, conventional hydrolysis modification technology is adopted. First, the polyacrylonitrile ultrafiltration membrane is immersed in 2N NaOH solution for 30 ...

[0059] The support body is polyacrylonitrile (PAN) material, flat ultrafiltration membrane, the molecular weight cut off is 20000, and the membrane area is 92cm 2 , the polycation material used is polyethyleneimine (PEI, molecular weight is 60,000), polyanion is polyacrylic acid (PAA, molecular weight is 4 million), and the solvent of polyethyleneimine and polyacrylic acid is deionized water.

[0060] Assembly conditions and methods:

[0061] (1) polyethyleneimine is made into 0.125wt% solution 2000ml with deionized water, is mixed with polycation solution through stirring, ultrasonic deaeration; With deionized water, polyacrylic acid is made into 0.025wt% solution 2000ml, through Stirring, ultrasonic defoaming to prepare polyanion solution;

[0062] (2) In order to charge the surface of the polyacrylonitrile-based membrane, conventional hydrolysis modification technology is adopted. First, the polyacrylonitrile ultrafiltration membrane is immersed in 2N NaOH solution for 30 ...

[0074] The support body is polyacrylonitrile (PAN) material, flat ultrafiltration membrane, the molecular weight cut off is 20000, and the membrane area is 92cm 2 , the polycation material used is polyethyleneimine (PEI, molecular weight is 60,000), polyanion is polyacrylic acid (PAA, molecular weight is 4 million), and the solvent of polyethyleneimine and polyacrylic acid is deionized water.

[0075] Assembly conditions and methods:

[0076] (1) polyethyleneimine is made into 0.125wt% solution 2000ml with deionized water, is mixed with polycation solution through stirring, ultrasonic deaeration; With deionized water, polyacrylic acid is made into 0.025wt% solution 2000ml, through Stirring, ultrasonic defoaming to prepare polyanion solution;

[0077] (2) In order to charge the surface of the polyacrylonitrile-based membrane, conventional hydrolysis modification technology is adopted. First, the polyacrylonitrile ultrafiltration membrane is immersed in 2N NaOH solution for 30 ...