A kind of preparation method of composite nanofiltration membrane with high throughput and high rejection rate
A technology of composite nanofiltration membrane and rejection rate, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of active layer thickness, small flux, low rejection rate, etc., and achieve easy operation and stability The effect of good performance and simple process
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Embodiment 1
[0039] A method for preparing a composite nanofiltration membrane with high throughput and high rejection rate, comprising the steps of:
[0040] (1) Preparation of cross-linked porous support membrane: mix polyetherimide and N-methylpyrrolidone that have been dried at 60°C for 12h in advance so that the mass concentration of polyetherimide is 19%, and stir at 60°C 12h, stand still for 10h to defoam, get the casting solution, pour the casting solution on the polypropylene non-woven fabric, scrape the film, make the thickness of the film 100μm, get a wet film, after 0s volatilization, transfer the wet film to 25℃ Soak in water for 5 minutes, take it out to obtain a base film of polyetherimide support layer, immerse it in an aqueous solution of ethylenediamine with a concentration of 3g / L to carry out cross-linking reaction for 0.5h, take it out and rinse it with deionized water, and blot dry the surface moisture to obtain a cross-linked porous support membrane;
[0041] (2) Pr...
Embodiment 2
[0044] A method for preparing a composite nanofiltration membrane with high throughput and high rejection rate, comprising the steps of:
[0045] (1) Preparation of cross-linked porous support membrane: mix polyetherimide and N, N-dimethylformamide which have been dried at 100° C. for 12 h in advance, so that the mass concentration of polyetherimide is 22%, Stir at 90°C for 6 hours, let it stand for 6 hours to defoam, and get the casting solution. Pour the casting solution on the polysulfone non-woven fabric, scrape the film to make the thickness of the film 300 μm, and volatilize for 10 seconds to get a wet film. Transfer to water at 50°C, soak for 120min, take it out to obtain a base film of polyetherimide support layer, immerse in ethylenediamine methanol solution with a concentration of 120g / L for cross-linking reaction for 5h, take it out and rinse it with deionized water, and Blot the moisture on the surface to obtain a cross-linked porous support membrane;
[0046] (2)...
Embodiment 3
[0049] A method for preparing a composite nanofiltration membrane with high throughput and high rejection rate, comprising the steps of:
[0050] (1) Preparation of a cross-linked porous support membrane: mix polyetherimide and N, N-dimethylacetamide which have been dried at 100° C. for 8 hours, so that the mass concentration of polyetherimide is 22%, Stir at 60°C for 6 hours, stand still for 14 hours to defoam, and obtain the casting solution. Pour the casting solution on the polyester non-woven fabric, scrape the film to make the thickness of the film 300 μm, and volatilize for 60 seconds to obtain a wet film. Transfer to 25 ℃ water, soak 60min, take out, obtain polyetherimide supporting layer base film (the surface structure of base film sees figure 1 ), immersed in a concentration of ethylenediamine isopropanol solution of 60g / L to carry out cross-linking reaction 5h, take out and rinse with deionized water, and blot the moisture on the surface to obtain a cross-linked por...
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