Anti-pollution separation membrane and preparation method
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A separation membrane, anti-pollution technology, used in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc.
Active Publication Date: 2012-10-17
TIANJIN POLYTECHNIC UNIV
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[0004] In view of the shortcomings of the current anti-pollution PVDF separation membrane preparation technology, the present invention provides a new method for preparing anti-microbial pollution PVDF separation membrane
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Embodiment 1
[0024] (1) Synthesis of copolymer: Add 0.25mol MMA, 0.05mol DMC and 0.05mol AMPS into a three-necked flask containing 100ml DMF, add 0.082g AIBN under nitrogen protection, and react for 24h under heating in an oil bath at 60°C. After the reaction is completed, wash with a large amount of ethanol and water for several times, and after drying, immerse the crude product in tetrahydrofuran solution to remove the homopolymer. Finally dry to obtain the refined copolymer, stand-by;
[0025] The added DMF quality in the step (1) is 2 times of the total mass of the reaction solution;
[0026] The THF quality used in the step is 2 times of the precipitate quality;
[0027] (2) Preparation of casting solution: take a certain amount of PVDF powder, copolymer powder, polyethylene glycol (PEG) and DMF (accounting for 76% of the total mass of casting solution) to prepare casting solution;
[0028] The PVDF / copolymer quality is 16% of the casting liquid quality, and the mass ratio of PVDF a...
Embodiment 2
[0034] (1) preparation of copolymer: with embodiment 1;
[0035] (2) preparation of casting solution: take a certain amount of PVDF powder, copolymer powder, polyethylene glycol (PEG) and dissolve in DMF (accounting for 70% of the total mass of casting solution) to prepare casting solution;
[0036] The quality of the PVDF / copolymer is 20% of the quality of the casting solution, and the mass ratio of PVDF to the copolymer is 7 / 3;
[0037] The polyethylene glycol (PEG) molecular weight is 10000, and the addition amount is 10% of the casting solution quality;
[0038] The added amount of DMF is 70% of the total mass of the casting solution;
[0039] (3) Preparation of flat film: the film casting solution prepared in the step (2), after degassing treatment, scrape flat film with a scraper, and solidify into film in water;
[0040] In the step (3), the degassing treatment time of the casting solution is 24 hours, the specification of the scraper is 300 μm, and the temperature of...
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Abstract
The invention discloses an anti-pollution separation membrane and a preparation method, wherein aiming at the shortages of a preparation technology for the present anti-pollution PVDF (polyvinylidene fluoride) separation membrane, the invention provides a novel method for preparing an anti-microbial pollution PVDF separation membrane. The novel method provided by the invention comprises the following steps of: synthesising the random copolymer with a zwitterionic structure, of MMA (methl methacrylate), DMC (dimethyl carbonate) and AMPS (2-acrylamido-2-methylpropane sulfonic acid) via free radical polymerization at first, adding the copolymer and a porogenic agent, i.e., polyethylene glycol (PEG) in PVDF, and preparing the anti-pollution separation membrane by using N,N-dimethyl formamide (DMF) as a solvent and using water as a coagulating agent through a phase inversion method. Electropositive quaternary amine group and electronegative sulfonic group exist in the structure of the copolymer simultaneously, and have a binding capacity for water molecules which is much stronger than the binding capacity of traditional polyethylene glycol and the derivatives of the traditional polyethylene glycol, and the formed hydration layer is more stable; therefore, the prepared novel PVDF membrane is lasting in anti-pollution performance.
Description
technical field [0001] The invention belongs to the technical field of polymer membranes, and relates to a polymer separation membrane resistant to microbial contamination. Background technique [0002] In recent years, membrane separation technology is gradually replacing traditional separation technologies such as chromatography and distillation due to its advantages of high separation efficiency, low energy consumption, no phase change, no pollution to the environment, and simple and easy to scale-up process in water treatment, petrochemical industry, etc. , biopharmaceuticals, environment, energy, food and medical care and other fields have played a huge role and achieved huge economic and social benefits. The core of membrane technology is membrane material and its separation membrane. As a common separation membrane material, polyvinylidene fluoride (PVDF) has excellent mechanical properties, chemical and thermal stability. Its strong hydrophobicity makes it an ideal...
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