Preparation method of flat plate microfiltration membrane for biological detection

A microbial detection and microfiltration membrane technology, applied in chemical instruments and methods, membranes, ultrafiltration, etc., can solve the problems of weak anti-pollution ability, large adsorption capacity, low flux, etc., and achieve strong retention capacity and high separation efficiency , excellent structural properties

Inactive Publication Date: 2018-07-06
冯婷婷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the disadvantages of large adsorption capacity, weak anti-pollution ability and low flux when the domestic microporous filter membrane is used to separate and contain m

Method used

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  • Preparation method of flat plate microfiltration membrane for biological detection
  • Preparation method of flat plate microfiltration membrane for biological detection
  • Preparation method of flat plate microfiltration membrane for biological detection

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1

[0024] A method for preparing a flat microfiltration membrane for biological detection, including the following steps:

[0025] 1) Mix the components of the casting solution uniformly, and set aside; the composition and weight percentage of the casting solution are: polyethersulfone 12.5%, sulfonated polyethersulfone 1.5%, polyvinylpyrrolidone-k30 11%, diethylene glycol 30 %, N-methylpyrrolidone 45%;

[0026] 2) Put the film casting liquid in step 1) to degas by standing: put the film casting liquid in a closed container and let it stand for degassing at 30°C;

[0027] 3) Steam induced film formation: Take a clean glass plate and place it on the film scraper horizontally, cast the film casting solution on one end of the glass plate, spread the film casting solution evenly on the glass plate with a 150μm scraper, stay for 90s, in the air The water vapor initially contacts with the casting liquid, exchanges with the solvent, and microphase separation occurs. Then, th...

Example Embodiment

[0028] Example 2

[0029] A method for preparing a flat microfiltration membrane for biological detection, including the following steps:

[0030] 1) Mix the components of the casting solution uniformly and prepare for use; the composition and weight percentage of the casting solution are: polyethersulfone 11%, sulfonated polyethersulfone 2%, polyvinylpyrrolidone-k30 12%, diethylene glycol 20 %, N-methylpyrrolidone 55%;

[0031] 2) Put the film casting liquid in step 1) to degas by standing: put the film casting liquid in a closed container and let it stand for degassing at 30°C;

[0032] 3) Steam induced film formation: Take a clean glass plate and place it on the film scraping machine horizontally, cast the film casting solution on one end of the glass plate, spread the film casting solution evenly on the glass plate with a 150μm scraper, stay in the air for 60s Preliminary contact between the water vapor and the casting liquid, exchanges with the solvent, and microphase separation...

Example Embodiment

[0033] Example 3

[0034] A method for preparing a flat microfiltration membrane for biological detection, including the following steps:

[0035] 1) Mix the components of the casting liquid uniformly, and set aside; the composition and weight percentage of the casting liquid are: polyethersulfone 13.5%, sulfonated polyethersulfone 0.5%, polyvinylpyrrolidone-k30 9%, diethylene glycol 30 %, N-methylpyrrolidone 47%;

[0036] 2) Put the film casting liquid in step 1) to degas by standing: put the film casting liquid in a closed container and let it stand for degassing at 30°C;

[0037] 3) Steam induced film formation: Take a clean glass plate and place it horizontally on the film scraper, cast the casting film on one end of the glass plate, spread the casting film evenly on the glass plate with a 150μm scraper, stay for 120s, in the air Preliminary contact between the water vapor and the casting liquid, exchanges with the solvent, and microphase separation occurs, and then the glass pla...

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Abstract

The invention discloses a preparation method of a flat plate microfiltration membrane for biological detection. The preparation method comprises the following steps: 1) preparing a membrane casting solution, uniformly mixing all components of the membrane casting solution for later use; 2) de-foaming: putting the membrane casting solution in step 1) into a sealed container and standing and de-foaming at 30 DEG C; 3) inducing by steam to prepare the membrane: horizontally putting a clean glass plate on a membrane scraping machine and casting the membrane casting solution to one end of the glassplate; uniformly spreading the membrane casting solution on the glass plate by utilizing a 150mu m scraping knife and remaining for 60 to 120s to enable water steam in air to be in primary contact with the membrane casting solution; exchanging with a solvent to generate tiny phase splitting; then horizontally putting the glass plate into hot steam and remaining for 30 to 80s until the surface ofthe membrane casting solution becomes white, so as to form a primary-state membrane with a round hole structure; furthermore, horizontally immersing the glass plate into a water groove containing de-ionized water with the temperature of 60 DEG C to realize complete phase splitting of the membrane casting solution, so as to form the microfiltration membrane with the thickness of 100 to 130mu m anda sponge-body-structure section.

Description

technical field [0001] The invention relates to a preparation method of a flat microfiltration membrane, in particular to a preparation method of a flat microfiltration membrane for biological detection. Background technique [0002] Microbiological detection is of great significance for disease diagnosis, food and medical safety, and microbial culture. Microbiological detection by membrane filtration is an internationally recognized standard method for microbiological testing, which has been widely used in environmental monitoring, pharmaceutical industry, food and beverage industry quality control and electronics industry. Compared with traditional detection methods, this method is more scientific, accurate and objective, and can fully reflect the contamination of samples. This is of great significance for ensuring the quality of testing and improving the level of testing technology. The core of the microbial detection method is the microfiltration membrane, whose perfor...

Claims

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Application Information

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IPC IPC(8): B01D69/06B01D67/00B01D61/14
CPCB01D61/147B01D67/0013B01D69/06B01D2325/36
Inventor 冯婷婷
Owner 冯婷婷
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