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A kind of preparation method of polyvinylidene fluoride composite fiber membrane

A polyvinylidene fluoride and composite fiber membrane technology, applied in the field of separation membranes, can solve the problems of being easily affected by organic substances and microorganisms, reducing the separation effect and service life of membranes, and low PVDF surface energy, and achieving broad industrial application prospects, Low cost and the effect of suppressing pollution

Active Publication Date: 2021-01-15
江苏海发新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention: Aiming at the low surface energy of PVDF, resulting in strong hydrophobicity, it is easily affected by organic matter and microorganisms during use, causing membrane pollution, reducing the separation effect and service life of the membrane. A kind of preparation method of polyvinylidene fluoride composite fiber membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Take 25g of glucose, 8g of yeast powder, 5g of disodium hydrogen phosphate, and 5g of peptone, add it to 800mL of deionized water, stir at 300r / min for 20min, and adjust the pH to 5.5 with citric acid, then place it in an autoclave, at 121°C , and sterilized for 20 minutes to obtain the culture medium, and the number of viable bacteria in 5 g was 3×10 8 CFU / g Acetobacter xylinum liquid was inoculated into 100g medium, then 1g hydroxyethyl chitosan was added, cultured in a constant temperature incubator at 25°C for 7 days, filtered to obtain filter residue, soaked in 0.1% sodium hydroxide solution The filter residue was soaked in a constant temperature water bath at 70°C for 1 hour, then the sodium hydroxide solution was replaced, the soaking operation was repeated 3 times, and then washed with deionized water until the washing liquid was neutral to obtain a composite bacterial cellulose gel. Take 40 g of acetone, and Mix 60g N, N-dimethylformamide evenly, then add 15g p...

example 2

[0027] Take 28g of glucose, 9g of yeast powder, 6g of disodium hydrogen phosphate, and 6g of peptone, add it to 900mL of deionized water, stir at 350r / min for 25min, and adjust the pH to 6.0 with citric acid, then place it in an autoclave, at 123°C , and sterilized for 25 minutes to obtain the culture medium, and the number of viable bacteria in 5 g was 4×10 8CFU / g Acetobacter xylinum liquid was inoculated into 110g medium, then 1g hydroxyethyl chitosan was added, cultured in a constant temperature incubator at 28°C for 9 days, the filter residue was filtered and soaked in 0.1% sodium hydroxide solution The filter residue was soaked in a constant temperature water bath at 75°C for 1 hour, then the sodium hydroxide solution was replaced, the soaking operation was repeated 4 times, and then washed with deionized water until the washing liquid was neutral to obtain a composite bacterial cellulose gel. Take 45g of acetone, and Mix 70g of N,N-dimethylformamide evenly, then add 16g ...

example 3

[0029] Take 30g of glucose, 10g of yeast powder, 8g of disodium hydrogen phosphate, and 8g of peptone, add them to 1000mL of deionized water, stir at 400r / min for 30min, and adjust the pH to 6.5 with citric acid, then place it in an autoclave, at 125°C , and sterilized for 30 minutes to obtain the culture medium, and the number of viable bacteria in 6 g was 5×10 8 CFU / g Acetobacter xylinum liquid was inoculated into 120g medium, then 2g hydroxyethyl chitosan was added, cultured in a constant temperature incubator at 30°C for 10 days, filtered to obtain filter residue, soaked in 0.1% sodium hydroxide solution The filter residue was soaked in a constant temperature water bath at 80°C for 2 hours, then the sodium hydroxide solution was replaced, the soaking operation was repeated 5 times, and then washed with deionized water until the washing liquid was neutral to obtain a composite bacterial cellulose gel. Take 50 g of acetone, and Mix 80g N, N-dimethylformamide evenly, then add...

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Abstract

The invention relates to a preparation method of a composite fiber membrane made from polyvinylidene fluoride, pertaining to the technical field of separation membranes. During the process of preparing bacterial cellulose gel, hydroxyethyl chitosan is added. The micro-structure and aggregation behaviors of bacterial cellulose are adjusted. Due to the nanometer effect, composite bacterial cellulosegel with a hyperfine net structure with high water absorptivity, a high water-retaining property, high penetration rate of liquid and gas and high wet strength and the feature of in-situ processing formation especially in the wet state is obtained. The composite bacterial cellulose gel is mixed with polyvinylidene fluoride. The mixture is uniformly dispersed into a main body of the membrane suchthat hydrophilia of the membrane is enhanced. A more hydrophilic and smoother membrane surface is offered to the membrane such that oil drops are hard to close to the surface of the membrane and settle and gather on the surface of the membrane. The membrane flux is kept at higher level. Additionally, after simple hydraulic cleaning, a restoration capability of the membrane flux is high. The membrane can be circularly used. Additionally, the composite hydroxyethyl chitosan has the antibacterial capability so that pollution of organic matter such as microorganisms such as proteins and humic acidis effectively inhibited.

Description

technical field [0001] The invention relates to a preparation method of a polyvinylidene fluoride composite fiber membrane, belonging to the technical field of separation membranes. Background technique [0002] Separation membrane is a kind of membrane material with selective permeation function, which can permeate one or several substances in the fluid, while other substances are not permeated, so as to play the role of concentration and separation and purification. Membrane separation technology is a new separation technology that appeared in the early 20th century and developed rapidly after the 1960s. Since the membrane separation technology has many functions such as separation, concentration, purification and refining, and at the same time, it shows the advantages of high efficiency, low energy consumption and no secondary pollution during the use process, especially in the field of saving energy and water resources. It has made outstanding contributions in terms of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H3/007D04H3/147D01D5/00
CPCD01D5/0069D04H3/007D04H3/147D10B2201/22D10B2321/042
Inventor 陈倩王文新韩昏晓
Owner 江苏海发新材料科技有限公司
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