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A preparation method of enhanced flat composite microporous membrane with improved hydrophilicity

A microporous membrane and enhanced technology, which is applied in the field of preparation of enhanced flat composite microporous membrane, can solve the problems of weak interfacial bonding force of flat composite membrane, easy breaking and falling off of membrane functional layer, insufficient mechanical strength, etc., and achieve strong interface Binding force and anti-backwashing ability, improve anti-backwashing ability, and good repeatability

Active Publication Date: 2016-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the support layer used in flat composite membranes is mostly non-woven fabrics (such as polyester non-woven fabrics, etc.), and the non-woven fabrics are mainly polymer fibers (such as polyester fibers, polyolefin fibers, etc.). The compatibility of polymers and polysulfone compounds is not good, the interface bonding force of the prepared flat composite membrane is weak, the mechanical strength is not enough, and the membrane functional layer is easy to break and fall off during backwashing

Method used

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  • A preparation method of enhanced flat composite microporous membrane with improved hydrophilicity
  • A preparation method of enhanced flat composite microporous membrane with improved hydrophilicity
  • A preparation method of enhanced flat composite microporous membrane with improved hydrophilicity

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specific Embodiment ）

[0045] The total mass percentage of polymer film material P1 and polymethyl methacrylate P2 in the casting solution is 12-25% (increasing or decreasing by 1% within the value range can be used as an optional specific embodiment), And in terms of weighing percentage, P2 / P1=0.05~0.25 (in the value range, every increment or decrement of 0.01 can be used as an optional specific embodiment), and the mass percentage of water-soluble polymer additive is 2~12% ( Every increase or decrease by 1% within the value range can be used as an optional specific embodiment), the mass percentage of inorganic salt is 1-5% (every increase or decrease by 1% within the value range can be used as an optional Selected specific embodiment), the mass percentage of organic solvent is 58 ~ 85% (in the value range, every increment or decrement by 1% can be used as an optional specific embodiment);

[0046] The polymer membrane material is any one of polyethersulfone, polysulfone, phthalazine polyethersulfo...

Embodiment 1

[0061] Fully dissolve polymethyl methacrylate with a mass percentage of 8% in N-methylpyrrolidone (NMP), filter and defoam to prepare a coating solution for a scraping film;

[0062] Dissolve 15% polyethersulfone, 3% polymethyl methacrylate, 6% polyvinylpyrrolidone, 4% polyethylene glycol, and 2% lithium chloride in 70% N- In methylpyrrolidone (NMP) organic solvent, stir at 60°C for 48 hours until the polymer is completely dissolved, mix thoroughly to make a uniform casting solution, filter, vacuumize and defoam, and then stand for use.

[0063] At an ambient temperature of 28°C, install the non-woven fabric 5 on the film scraping machine, control the cloth running speed controller 7 so that the non-woven cloth running speed is 0.8m / min, adjust the scraper 4 and the non-woven fabric that acts as a supporting layer The distance between 5 is 20 μm, and the coating solution with a temperature of 28 ° C is scraped and coated on the non-woven fabric through the material tank 1, the...

Embodiment 2

[0068] Fully dissolve polymethyl methacrylate with a mass percentage of 12% in the organic solvent N-methylpyrrolidone (NMP), filter and defoam to prepare a coating solution for a scraping film;

[0069] Dissolve 10% polysulfone, 2% polymethyl methacrylate, 7% polyvinylpyrrolidone, 2% polyethylene glycol, and 1% lithium chloride into 78% N-methyl chloride by mass percentage. Pyrrolidone (NMP) organic solvent, stirred at 60°C for 36 hours until the polymer was completely dissolved, mixed thoroughly to make a uniform casting solution, filtered, vacuumed and defoamed, and then left to stand for use.

[0070]At an ambient temperature of 28°C, install the non-woven fabric 5 on the film scraping machine, control the cloth running speed controller 7 so that the non-woven cloth running speed is 0.8m / min, adjust the scraper 4 and the non-woven fabric that acts as a supporting layer The distance between 5 is 20 μm, and the coating solution with a temperature of 27 ° C is scraped onto th...

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Abstract

The invention relates to a method for preparing a reinforced flat composite microporous membrane with improved hydrophilicity, and aims to provide a membrane with good hydrophilicity and a functional layer that is not easily peeled off during use in the technical field of water treatment The method mainly includes the following steps: first, prepare a dilute solution from a polymer that has a good binding force with the non-woven fabric that acts as a supporting layer and the film-making material, and pour the dilute solution into the trough of the film scraping machine, pass through a metering pump, and enter Knife-edge groove, control the speed of the cloth, and use a scraper to scrape the film on the non-woven fabric; dissolve the film-making materials and additives in an organic solvent to make a casting liquid, and use the scraper machine to clean the non-woven fabric after the first scraping. The spun cloth is coated with the second scraping film, and then immersed in the coagulation bath to obtain a flat composite microporous membrane through the solution phase inversion method. The prepared liquid membrane has good hydrophilicity, is not easily polluted, has a large flux, low cost, and has a The binding force is strong, and the preparation method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of material science and environmental protection, relates to a polymer membrane used for sewage recycling (abbreviated as reuse) and a manufacturing method thereof, and more specifically relates to an enhanced flat composite microporous membrane with improved hydrophilicity Preparation. Background technique [0002] With the advancement of petrochemical technology, the sources of wastewater pollutants in petrochemical enterprises are more complex. In addition to the main production materials, there are also a large number of additives, catalysts, intermediate products and by-products. The treatment of these complex pollutants is a very difficult problem for petrochemical enterprises. In the membrane sewage recovery and utilization device, these pollutant components are likely to cause membrane fouling, membrane breakage or damage to the separation layer, resulting in an irreversible decline in the quality of the memb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D71/68B01D71/66B01D71/34B01D67/00
Inventor 杨丽魏昕杨永强
Owner CHINA PETROLEUM & CHEM CORP
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