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Preparation method of high-flux tubular microfiltration membrane

A tubular microfiltration membrane and high-flux technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of frequent membrane replacement, large pressure loss and low flux of hollow fiber and flat membranes , to achieve good chemical resistance, easy industrial production, uniform pore size distribution

Inactive Publication Date: 2012-12-05
JIANGSU KAIMI MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual use, due to the limitation of the hollow fiber and flat membrane structure, the flow channel is narrow and the mechanical strength is poor, strict pretreatment must be carried out before filtration, and the pressure loss of the hollow fiber and flat membrane is large, so it is not suitable for treating high solid content. , High-viscosity feed-liquid system, difficult membrane cleaning and flux recovery after contamination, short service life and frequent membrane replacement
At present, most PVDF membranes on the market are ultrafiltration membranes, with small pore size, low flux, and easy pollution, which greatly limits the industrial application of PVDF membranes.

Method used

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  • Preparation method of high-flux tubular microfiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The mass percentage group is made into 5%polytic fluoride, 8%polyethylene pyrirol, 2%calcium carbonate is placed in a three-mouth bottle, and then 85%N, n-di metamimamide is mixed with each component, and the water bath is heated.By 60 ° C, stir at a constant temperature constant temperature of 400R / min at a 400R / min to fully mix each component to get the casting liquid;The woven fabric is placed on the integrated tube coating film together. The non -woven fabric is rolled into a tube and the inner surface coating film.After 10 ~ 60 seconds in the air, the base film base film is soaked in a pure water solidarity bath with a temperature of 25 ° C for 3 days after the temperature of 25 ° C.

[0051] According to the conventional membrane performance evaluation method, at the pressure of 0.1MPa and the temperature of 25 ° C, the pure water flux of the membrane is 939L / m 2 · H.

Embodiment 2

[0053]The mass percentage group is made into 10%polytic fluoride, 6%polyethylene pyrirol, 5%ethylene glycol, 2%water, 2%silica in three bottle, and then add 75%n, n-diracleMix each component, heat the water bath to 60 ° C, and stir at the constant temperature constant temperature at a 300R / min of 300R / min to fully mix each component to get the casting liquid; seal the casting liquid under vacuum conditions under vacuum conditions.Stiring for 24 hours, after being completely off -bubble, it is placed on an integrated tube coating film with non -woven fabrics. The non -woven fabric is rolled into a tube and the inner surface coating film.Get the tube -type microformeal membrane base film; then after 10 ~ 60 seconds of the tube microfillet membrane base membrane is stated in the air, and quickly immersed in a pure water solidarity bath with a temperature of 25 ° C for 5 days.Products.

[0054] According to the conventional membrane performance evaluation method, at the pressure of 0....

Embodiment 3

[0056] The quality percentage group is made into 12%polytic fluoride, 10%polyethylene pyrirol, 5%acetone, and 2%ammonium chloride in a three-mouth bottle, and then add 71%N, n-dimethyl acetyideMixing, heating the water bath to 50 ° C, stirring at a constant temperature constant temperature of 300R / min at a 300R / min, for 16 hours to fully mix each component to obtain the casting liquid;After decoction with non -woven fabrics on an integrated tube coating film, non -woven fabrics are rolled into pipes and coating the film at the inner surface.Film; subsequently put the tube -type microformeal membrane base film in the air for 10 ~ 60 seconds, soak into a distilled water solidarity bath with a temperature of 25 ° C for 4 days, and turn it to form the finished micro -filter membrane product.

[0057] According to the conventional membrane performance evaluation method, at the pressure of 0.1MPa and the temperature of 25 ° C, the pure water flux of the membrane is 886L / m 2 · H.

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Abstract

The invention relates to a preparation method of a high-flux tubular microfiltration membrane. The preparation method comprises preparing a membrane casting liquid and forming a membrane through phase inversion, and comprises the following specific steps of: mixing polyvinylidene fluoride, a pore-foaming agent, an additive and a solvent, heating to 30-80 DEG C, and stirring at the constant stirring speed of 100-1,000 revolutions per minute at a constant temperature for 10-48 hours to obtain a membrane casting liquid; standing the membrane casting liquid under the vacuum condition for defoaming for 10-48 hours, and winding a non-woven fabric into a non-woven fabric support pipe by using an integral tubular coating machine while completing membrane coating to obtain a tubular microfiltration basement membrane; and soaking the tubular microfiltration basement membrane into a coagulating bath, and performing phase inversion to obtain a finished tubular microfiltration membrane. The tubular microfiltration membrane has the characteristics of simple preparation process, high membrane flux, uniform pore diameter distribution, high mechanical strength, high chemical tolerance and the like.

Description

Technical field [0001] The present invention is a high -molecular separation film technology field, which specially involves a preparation method for high -throughput tube micro filter membranes. Background technique [0002] Super / micro filter technology, as a membrane separation technology, is mostly porous asymmetric structure. The filtering process is a separation process based on the pressure difference between the two sides of the membrane and based on the principle of mechanical screening.Operations, the process of processing, low energy consumption, and high separation accuracy. At present, it has been widely used in drinking water purification, industrial water treatment, beverages, biology, food, medicine, environmental protection, chemical, metallurgy, oil, etc. [0003] Polyethylene ethylene (PVDF) is a crystalline polymer with excellent performance. Its outstanding chemical stability, excellent mechanical strength, radiation resistance, anti -pollution and heat resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/04B01D69/10
Inventor 云金明关晓琳岑彩荣
Owner JIANGSU KAIMI MEMBRANE TECH
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