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Method for preparing high-throughput ultrafiltration membrane from nano calcium carbonate doped polysulfone

A technology of nano-calcium carbonate and ultrafiltration membrane, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve limited problems, increase the amount of addition, improve pore-making effect, etc., and achieve simple process and mild preparation conditions Effect

Inactive Publication Date: 2017-05-24
TIANJIN BISHUIYUAN MEMBRANE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with inorganic additives, polymer additives are not easy to be washed off during post-treatment, but the improvement of pore-forming effect is limited
Further increasing the amount added can not improve the film performance, the general amount is between 2-7%

Method used

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  • Method for preparing high-throughput ultrafiltration membrane from nano calcium carbonate doped polysulfone
  • Method for preparing high-throughput ultrafiltration membrane from nano calcium carbonate doped polysulfone
  • Method for preparing high-throughput ultrafiltration membrane from nano calcium carbonate doped polysulfone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 5g of calcium carbonate to 80g of N-methylpyrrolidone (NMP), ultrasonically disperse for 30 minutes, then add 15g of dried polysulfone, heat in an oil bath at 80°C, and prepare a uniform casting solution. Step 3. Flat membrane preparation: After filtering and defoaming the casting solution, scrape it evenly on a clean glass plate with a scraper, and transfer it into water to form a membrane. After desolvation, soak in 1.2mol / L hydrochloric acid solution for 20 minutes, take it out and wash it with deionized water until pH=7 of the eluate, and store the obtained membrane in deionized water for later use.

Embodiment 2

[0037] Weigh 7.5 g of nano-calcium carbonate and add it to 80 g of NMP, ultrasonically disperse for 30 minutes, then add 15 g of dry-treated polysulfone to it, heat in an oil bath at 80°C, and prepare a uniform casting solution. After filtering and defoaming, evenly hang it on a clean glass plate with a spatula, and then transfer it into water for phase inversion to form a film. After desolvation, soak in 1.2mol / L hydrochloric acid for 20min. Take out and rinse with deionized water until the pH of the eluate is 7, and set aside.

Embodiment 3

[0039] Weigh 10 g of nano-calcium carbonate and add it to 80 g of NMP, ultrasonically disperse for 30 minutes, then add 15 g of dry-treated polysulfone to it, heat in an oil bath at 80°C, and prepare a uniform casting solution. After filtering and defoaming, evenly hang it on a clean glass plate with a spatula, and then transfer it into water for phase inversion to form a film. After desolvation, soak in 1.2mol / L hydrochloric acid for 20min. Take out and rinse with deionized water until the pH of the eluate is 7, and set aside.

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Abstract

The invention discloses a method for preparing a high-throughput ultrafiltration membrane from nano calcium carbonate doped polysulfone. The method comprises the steps of taking the polysulfone as a polymer membrane material and nano calcium carbonate as a doped particle to prepare membrane casting liquid, preparing a membrane by a nonsolvent-induced phase separation method, and treating with a hydrochloric acid aqueous solution at a certain concentration for a period of time to form the high-throughput ultrafiltration membrane. The prepared ultrafiltration membrane can be used for ultrafiltration and serve as a basement membrane for preparing a nanofiltration and reverse osmosis composite membrane. The throughput of the ultrafiltration membrane is greater than that of the pure polysulfone under the same pressure, and an entrapment rate of bovine serum albumin is not changed basically.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a method for preparing a high-flux ultrafiltration membrane doped with nanometer calcium carbonate and polysulfone. Background technique [0002] Ultrafiltration originated in 1748. It is a membrane technology that uses pressure difference as the driving force to achieve the effect of separation through size sieving. Because of its simple operation, low cost, no need to add any chemical reagents, and mild conditions, it has been widely used in wastewater treatment, household water purifiers and food hygiene industries. [0003] The core of ultrafiltration technology is ultrafiltration membrane. The key factors to evaluate the performance of ultrafiltration membrane are flux, rejection rate and anti-fouling. Therefore, a key issue in improving the performance of ultrafiltration membranes is to reduce the permeation resistance of water or increase the hydrophilicity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D67/00B01D69/02
CPCB01D71/68B01D67/0002B01D69/02B01D71/02B01D2323/12
Inventor 陈亦力况武林勇彭文娟
Owner TIANJIN BISHUIYUAN MEMBRANE MATERIAL CO LTD
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