Polymer separation membrane and preparation method
A technology for separating membranes and polymers, applied in the field of membrane materials, can solve the problems of high volatility of plasticizers, easy volatilization with membrane solvents, and reduced separation effect of composite membranes, achieving high thermal stability, good metal separation efficiency, and good The effect of the separation effect
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[0042] The present invention also provides a method for preparing a polymer separation membrane, comprising:
[0043] a) Mix polyvinylidene fluoride, film solvent, plasticizer and extractant, heat after stirring to obtain a casting solution, and the plasticizer is 1,3-dioxane whose anion is fluoroborate or fluorophosphate Imidazolium salt, the extractant is a quaternary phosphonium salt extractant or a quaternary ammonium salt extractant;
[0044] b) scraping the casting solution on the carrier, and obtaining the primary film after solidification;
[0045] c) removing the membrane solvent in the nascent membrane, and obtaining a polymer separation membrane after drying.
[0046] First, mix polyvinylidene fluoride, film solvent, extractant and plasticizer, stir and heat to dissolve polyvinylidene fluoride in the film solvent, and fully mix with extractant and plasticizer. In order to make polyvinylidene fluoride, extractant, plasticizer mix more uniformly, described step a) pre...
Embodiment 1
[0063] 0.50g of polyvinylidene fluoride powder with molecular weight of 900000, 5.0mLN, N-dimethylformamide, 0.42g of ionic liquid [C 8 mim][BF 4 ] mixed with 0.16g Cyphos IL 104, stirred magnetically at 25°C for 5 minutes, heated at 40°C for 3 days, stirred again at 25°C for 30 minutes, and heated at 40°C for 10 minutes to obtain a casting solution; at 25°C, scrape the casting solution on a smooth surface On the glass plate, after volatilization for 20 seconds after scraping, put the glass plate and the casting solution on it into the coagulation solution at 20°C together, so that the casting solution solidifies and forms a film that floats naturally to obtain a primary film; The film was soaked in deionized water for 6h to remove N,N-dimethylformamide, and the plasticizer [C 8 mim][BF 4 ] and extractant Cyphos IL 104 polyvinylidene fluoride separation membrane.
[0064] The polyvinylidene fluoride separation membrane was placed under an electron microscope to obtain the f...
Embodiment 2
[0066] 0.50g of polyvinylidene fluoride powder with molecular weight of 1,100,000, 5.0mL of N, N-dimethylformamide, 0.42g of ionic liquid [C 8 mim][PF 6 ] mixed with 0.16g Cyphos IL 104, stirred magnetically at 25°C for 5 minutes, heated at 40°C for 3 days, stirred again at 25°C for 30 minutes, and heated at 40°C for 10 minutes to obtain a casting solution; at 25°C, scrape the casting solution on a smooth surface On the glass plate, after volatilization for 20 seconds after scraping, put the glass plate and the casting solution on it into the coagulation solution at 20°C together, so that the casting solution solidifies and forms a film that floats naturally to obtain a primary film; The film was soaked in deionized water for 6h to remove N,N-dimethylformamide, and the plasticizer [C 8 mim][PF 6 ] and extractant Cyphos IL 104 polyvinylidene fluoride separation membrane.
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Abstract
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