A high-temperature resistant precision molecular weight cut-off ultrafiltration membrane and a preparing method thereof

A technology with molecular weight cut-off and high temperature resistance, used in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The preparation process is simple and easy to operate, the ultrafiltration effect is improved, and the retention rate is improved.

Inactive Publication Date: 2016-11-30
VONTRON MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of bioengineering and pharmaceutical industry, it is necessary to deal with a large number of soluble substances with low molecular weight and high molecular substances such as enzymes, viruses, and proteins with a molecular weight of several thousand. For the treatment of such substances, nanofiltration is currently widely used in China. However, the preparation method of the nanofiltration membrane is complicated, the operating pressure is much higher than that of the ultrafiltration membrane, and the permeation flux in the separation process is low, which cannot meet the market demand; the inorganic membrane is difficult to seal; At the same time, foreign research on ultrafiltration membranes mainly focuses on ultrafiltration membranes with a molecular weight cut-off of tens of thousands to hundreds of thousands, and there are relatively few reports on ultrafiltration membranes’ low molecular weight cut-off research.

Method used

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  • A high-temperature resistant precision molecular weight cut-off ultrafiltration membrane and a preparing method thereof
  • A high-temperature resistant precision molecular weight cut-off ultrafiltration membrane and a preparing method thereof

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preparation example Construction

[0025] In some embodiments, the method for preparing a high-temperature precision molecular weight cut-off ultrafiltration membrane comprises the following steps:

[0026] (1) The polymer and the pore-forming agent are added to the organic solvent, wherein the amount of the polymer is 10-24% by mass percentage, the pore-forming agent is 1-10%, and the balance is the organic solvent; the adjustment temperature is 65-75 ℃, stirred and dissolved for 2-4 hours, filtered to remove impurities, and then vacuumed to remove air bubbles to obtain the casting solution, and the casting solution was evenly scraped on the non-woven fabric, and treated in a water bath to make it solidify and transform into membrane, and then washed with water at 79-81°C to obtain a wet base membrane;

[0027] (2) Soak the wet base film into the modifier solution, soak for 1-300min; wherein the temperature of the modifier solution is 80-90°C, take out the wet base film, and dry it at 80-90°C, get.

[0028] ...

Embodiment 1

[0037] (1) The preparation of the wet state ultrafiltration base membrane, the membrane material polymer and the pore-forming agent are added in the organic solvent, wherein the membrane material polymer is 10%, the pore-forming agent is 1%, and the remainder is an organic solvent, at 70 ℃ Dissolve with left and right mechanical stirring for 2 to 4 hours, filter to remove residual impurities, and vacuum remove air bubbles to obtain a clear and transparent casting solution. Scrape the casting solution on a flat and dry non-woven fabric at a constant speed, and then pour it in pure water In the coagulation bath, the phase is transformed into a film, and then washed by high-temperature pure water at 80°C;

[0038] (2) The preparation of the modified solution, adding 3% of the crosslinking agent a and 10% of the crosslinking agent b in the total mass of the modified solution into the solvent, mechanically stirring and dissolving at about 50°C to obtain a clear and transparent solut...

Embodiment 2

[0041] (1) The preparation of wet state ultrafiltration base membrane, membrane material polymer and pore-forming agent are added in the organic solvent, and wherein membrane material polymer is 15%, pore-forming agent is 3%, and the remainder is organic solvent, at 70 ℃ Dissolve with left and right mechanical stirring for 2 to 4 hours, filter to remove residual impurities, and vacuum remove air bubbles to obtain a clear and transparent casting solution. Scrape the casting solution on a flat and dry non-woven fabric at a constant speed, and then pour it in pure water In the coagulation bath, the phase is transformed into a film, and then washed by high-temperature pure water at 80°C;

[0042] (2) The preparation of the modified solution, adding 1.75% of the crosslinking agent a and 8% of the crosslinking agent b in the total mass of the modified solution into the solvent, mechanically stirring and dissolving at about 50°C to obtain a clear and transparent solution, and adding a...

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Abstract

The invention relates to the field of membrane technology, in particular to a high-temperature-resistant precision molecular weight cut-off ultrafiltration membrane and a preparation method thereof. The composition of raw materials and the definition of parameters in the preparation process of the base film ensure that the performance of the prepared wet base film is stable after the subsequent modification treatment, and can effectively improve its high temperature resistance; at the same time, combined with the modification process The definition of time, temperature and treatment method in the process makes the rejection rate of the ultrafiltration membrane to the molecular weight range of 2000-4000 reach more than 90%, which effectively improves the interception of the ultrafiltration membrane to low molecular weight substances and improves the quality of the filtration product .

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a high-temperature-resistant precision molecular weight cut-off ultrafiltration membrane and a preparation method thereof. Background technique [0002] Ultrafiltration separation technology is one of the membrane separation technologies developed in the 1960s. At present, for foreign countries, ultrafiltration membrane technology has been applied to the field of drinking water treatment technology, while in my country it is mainly used in industrial water treatment, and with the rapid development of domestic industrial level, its application in chemical industry, steel smelting, electric power and other industries Wastewater treatment in the field has been widely used, and with the development of industry, water pollution has become more and more serious, resulting in the shortage of available water resources has become increasingly prominent; according to statistics, more than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/16B01D71/20B01D71/30B01D71/34B01D71/38B01D71/42B01D71/68
CPCB01D67/0013B01D67/0011B01D67/0016B01D69/02B01D71/16B01D71/20B01D71/30B01D71/34B01D71/38B01D71/42B01D71/68
Inventor 杨兴胜郭玉阳陈心笛梁松苗赵治宁
Owner VONTRON MEMBRANE TECH CO LTD
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