Preparation method of nanofiltration membrane, and nanofiltration membrane prepared therethrough
A nanofiltration membrane and base membrane technology, applied in the field of water treatment membranes and nanofiltration membranes, can solve the problems of low acid-resistant nanofiltration membrane performance, non-continuous production, and high production costs, and achieve environmentally friendly preparation, low cost, and excellent acid resistance. sexual effect
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[0037] In one embodiment, the application provides a kind of preparation method of nanofiltration membrane, it comprises the following steps:
[0038] dissolving the polymer in a solvent to prepare a polymer solution, and solidifying the polymer solution on a support material to form a basement membrane (hereinafter referred to as "basement membrane preparation process");
[0039] Applying the first liquid phase solution and the second liquid phase solution sequentially on the base film to form a nascent eco-film (hereinafter referred to as "nascent eco-film preparation process");
[0040] Using a solution containing an alkaline substance to perform densification treatment on the nascent film (hereinafter referred to as "densification treatment process");
[0041] Treat the densified nascent membrane with a solution containing an acidic substance (hereinafter referred to as "flux enhancement process");
[0042] After post-treatment and drying, the nanofiltration membrane is o...
Embodiment 1
[0087] (1) Preparation of base film
[0088] Add 200kg of polyether nitrile ketone (number-average molecular weight: 23000Da) and 20kg of n-butanol into 1000L of N-methylpyrrolidone solvent, stir at 25°C for 12 hours to dissolve completely; then filter, Stand for defoaming at 25°C for 12 hours to obtain a uniform and stable casting solution for use.
[0089] The prepared casting solution is evenly coated on the non-woven fabric substrate by a flat scraping machine, and then enters the circulating cooling water tank, and then passes through the normal temperature water tank and the 75°C water tank to ensure complete solvent exchange in the film; during the coating process The ambient temperature is 25°C, the ambient humidity is 40%; the air residence time for evaporation is 5s, the film scraping speed is 8m / min, and the film thickness including the non-woven substrate is 6.5mil. According to performance evaluation, the molecular weight cut-off of the prepared base film is 2000...
Embodiment 2
[0097] (1) Preparation of base film
[0098] Add 200kg polyethersulfone (number average molecular weight 35000Da) and 20kg polyethylene glycol (number average molecular weight 6000Da) into 1000L N,N-dimethylacetamide solvent, stir at 25°C for 12h to make it completely Dissolve; then filter it, and let it stand for defoaming at 25°C for 12 hours to obtain a uniform and stable casting solution for use.
[0099] The prepared casting solution is evenly coated on the non-woven fabric substrate by a flat scraping machine, and then enters the circulating cooling water tank, and then passes through the normal temperature water tank and the 75°C water tank to ensure complete solvent exchange in the film; during the coating process The ambient temperature is 25°C, the ambient humidity is 40%; the air residence time for evaporation is 5s, the film scraping speed is 8m / min, and the film thickness including the non-woven substrate is 6.5mil. According to performance evaluation, the molecu...
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