A kind of preparation method of self-healing polymer separation membrane
A technology of polymer and separation membrane, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as lack of self-healing ability, achieve excellent hydrophilicity, easy production, and simple implementation steps Effect
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[0029] According to the present invention, a preparation method of a self-healing polymer separation membrane comprises the following steps:
[0030] A preparation method of a self-healing polymer separation membrane, comprising the following steps:
[0031] (1) Dissolving one or more block polymers in a mixed solvent to form a casting liquid;
[0032] (2) Cast the casting solution on the surface of the glass or polymer A porous membrane to form a flat membrane;
[0033] (3) Leave the flat film in the air for 5-300s to form a primary film;
[0034] (4) Immerse the primary membrane in the coagulation bath, so that the primary membrane is immersed in the coagulation bath for 2~300s to form a cured self-healing polymer separation membrane;
[0035]The block polymer in the step (1) is composed of one or more of A-B, A-B-A, A-B-C, α-A-B-ω, α-A-B-ω or α-A-B-C-ω according to any ratio, wherein A is selected from polysulfone, polyethersulfone, polyvinylidene fluoride, polyacrylonit...
Embodiment 1
[0048] A preparation method of a self-healing polymer separation membrane, the steps are as follows:
[0049] (1) The block copolymer P2VP-b-PES-b-P2VP composed of polyethersulfone and poly-2-vinylpyridine was dissolved in a mixed solution composed of acetone and dimethylacetamide to form a homogeneous Casting liquid, wherein each composition is as follows:
[0050] The mass volume fraction of the block copolymer composed of polyethersulfone and poly-2-vinylpyridine in the casting solution is 100g / L, and the mass ratio of polyethersulfone and 2-vinylpyridine in the block polymer is 100 g / L. is 4:1, and the molecular weights of polyethersulfone and poly-2-vinylpyridine in the block polymer are 160,000 g / mol and 40,000 g / mol, respectively;
[0051] The volume ratio of acetone and dimethylacetamide in the solution is 90%:10%.
[0052] (2) The casting liquid is uniformly cast onto the polyacrylonitrile ultrafiltration membrane through the scraping device to form a flat membrane;...
Embodiment 2
[0056] A preparation method of a self-healing polymer separation membrane, the steps are as follows:
[0057] (1) The block copolymer PSf-b-P4VP composed of polysulfone and poly-4-vinylpyridine was dissolved in a mixed solution composed of tetrahydrofuran and dimethylacetamide to form a homogeneous casting solution, in which each The composition is as follows:
[0058] The mass and volume fraction of the block copolymer composed of polysulfone and poly-4-vinylpyridine in the casting solution was 800 g / L, and the mass of polysulfone and poly-4-vinylpyridine in the block polymer was 800 g / L. The ratio is 3:1, and the molecular masses of polysulfone and poly-4-vinylpyridine in the block polymer are 180,000 g / mol and 60,000 g / mol, respectively;
[0059] The volume ratio of tetrahydrofuran and dimethylacetamide in the solution is 10%:90%.
[0060] (2) The casting liquid is uniformly cast onto the PTFE microfiltration membrane through a scraping device to form a flat membrane;
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