Narrow molecular weight ultrafiltration membrane and its preparation method and method and application of narrowing ptmeg molecular weight
A molecular weight, ultrafiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of low removal rate of low molecular weight PTMEG, avoid decomposition and oxidation, reduce energy consumption, improve The effect of product quality
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Embodiment 1
[0028] Embodiment 1: this narrowing molecular weight ultrafiltration membrane obtains according to the following preparation method: the first step, in the film-forming solution that mass percent is 10% to 15%, after adding film-forming raw material, obtain film liquid, wherein, every 2 Add 0.45 grams to 10 grams of film-forming raw materials to the film-forming solution with a mass percentage of 10% to 15%; in the second step, add a dispersant and PVP nanoparticles with a molecular weight of 200 to 4000 to the film solution and stir evenly Finally, the mixed membrane solution is obtained, wherein, every 2 liters of membrane solution is added with 2mg to 6mg of dispersant and 2g to 3g of PVP nanoparticles with molecular weight of 200 to 4000; The membrane is used as the base, the mixed membrane liquid is coated on the filter membrane, and then a wet film with a thickness of 10 μm to 12 μm is scraped on the surface of the filter membrane, and the solvent is evaporated under the ...
Embodiment 2
[0030] Embodiment 2: this narrowing molecular weight ultrafiltration membrane obtains according to the following preparation method: the first step, in the film-forming solution that mass percentage is 10% or 15%, after adding film-forming raw material, obtain film liquid, wherein, every 2 Add 0.45 grams or 10 grams of film-forming raw materials to a film-forming solution with a mass percentage of 10% or 15%; in the second step, add a dispersant and PVP nanoparticles with a molecular weight of 200 or 4000 to the film solution and stir evenly Finally, the mixed membrane liquid is obtained, wherein, the molecular weight of 2mg or 6mg and the molecular weight of 2g or 3g are added to the PVP nanoparticles of 200 to 4000 in every 2 liters of membrane liquid; The membrane is used as the base, and the mixed membrane liquid is coated on the filter membrane, and then a wet film with a thickness of 10 microns or 12 microns is scraped on the surface of the filter membrane, and the solven...
Embodiment 3
[0031] Embodiment 3: as the optimization of above-mentioned embodiment, the solute of film-forming solution is the reactant of chitosan or benzoic acid or acrylic acid and ammoniacal liquor, and the solvent of film-forming solution is N,N-dimethylacetamide or dimethyl methoxide Sulfone or tetrahydrofuran, the film-forming raw material is ammonium persulfate or acetic acid; or / and, the dispersant is more than one of graphene and titanium dioxide.
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