High-flux low-attenuation polyvinylidene fluoride separating membrane and preparation method
A technology of polyvinylidene fluoride and low attenuation, which is applied in the field of membrane separation, can solve the problems that a single membrane material cannot meet the actual application requirements, shorten the service life, and increase the production cost, so as to improve the anti-pollution ability, reduce the attenuation coefficient, and prepare low cost effect
Inactive Publication Date: 2016-07-20
HUAZHONG AGRI UNIV
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Problems solved by technology
[0003] In the application process of polymer membranes, membrane fouling leads to decreased membrane flux, shortened service life, and increased production costs, which have become obstacles to the further promotion and application of membrane technology and are one of the most noteworthy issues in membrane applications.
With the continuous expansion of the application field of membrane technology, the performance requirements of membrane materials continue to increase, and a single membrane material can no longer meet the requirements of practical applications. Therefore, it is urgent to develop new varieties or modify existing materials.
Method used
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Embodiment 1
[0031] A high-flux and low-attenuation polyvinylidene fluoride separation membrane is made of the following raw materials in parts by weight:
[0032]
[0033] The preparation method of high flux and low attenuation polyvinylidene fluoride separation membrane, its steps are:
[0034] A. Add the weighed pore forming agent and inorganic nanoparticles into the weighed organic solvent and ultrasonically disperse for 10 or 14 or 18 or 22 or 26 or 30 minutes;
[0035] B. Add the weighed polyvinylidene fluoride to the organic solvent, stir it mechanically for 1 or 1.5 or 2 hours, and let it stand for 24 or 30 or 36 or 42 or 48 hours to defoam to obtain the casting solution;
[0036] C. Scrape the casting solution on the glass plate to form a film at 20 or 23 or 25 or 28 or 30°C, and then slowly put it into the coagulation solution and soak until the film falls off the glass plate automatically;
[0037] D. After rinsing the membrane with distilled water at room temperature, soak ...
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Abstract
The invention discloses a high-flux low-attenuation polyvinylidene fluoride separating membrane and a preparation method. The high-flux low-attenuation polyvinylidene fluoride separating membrane is prepared from polyvinylidene fluoride, a pore-forming agent, inorganic nanoparticles and an organic solvent according to a certain proportion. The preparation method comprises the following steps: A, adding weighed pore-forming agent and inorganic nanoparticles into weighed organic solvent to perform ultrasonic dispersion; B, adding weighed polyvinylidene fluoride into the organic solvent, mechanically stirring, standing, and de-foaming to obtain a membrane casting solution; C, scraping the membrane casting solution on a glass plate to form a membrane, and placing the glass plate into solidification liquid for soaking till the membrane automatically falls off from the glass plate; D, bleaching the membrane with distilled water at the room temperature, and placing the membrane into deionized water for soaking to obtain the high-flux low-attenuation polyvinylidene fluoride separating membrane. The raw material source is wide, the process is simple, and industrial scale production can be realized easily. The hydrophily of the membrane is enhanced through the nanoparticles, the membrane flux is 190L / (m<2>.h), and the membrane flux attenuation coefficient is lowered remarkably. The obtained polyvinylidene fluoride separating membrane has a wider application prospect.
Description
technical field [0001] The invention belongs to the technical field of membrane separation, and more specifically relates to a polymer organic separation membrane, and also relates to a preparation method of a polymer organic separation membrane, which is suitable for preparing ultrafiltration or microfiltration membranes with excellent performance and used in water treatment There are a wide range of applications in the field. Background technique [0002] Separation membrane technology has achieved rapid development in my country. In 2014, the scale of national separation membrane related industries has reached 73.5 billion yuan. my country has become a big country in the manufacture and application of separation membranes. Domestic separation membranes have been used in 10,000-ton seawater desalination projects. The manufacture and application of polytetrafluoroethylene microporous membranes and flat ceramic microfiltration membranes are in full swing. Zero discharge of w...
Claims
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IPC IPC(8): B01D71/34B01D69/02B01D67/00
CPCB01D67/0079B01D69/02B01D71/34B01D2325/36
Inventor 左行涛周瞾林杉龚烨霞
Owner HUAZHONG AGRI UNIV