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Hollow fiber separation membrane and preparation method thereof

A fiber separation and hollow technology, applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of large-scale application, high mechanical strength, high thermal stability, etc. Good stain resistance and good compatibility

Inactive Publication Date: 2014-07-16
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common advantages of these membrane materials are high mechanical strength, chemical corrosion resistance, and high thermal stability. The disadvantage is that they all have strong hydrophobicity.
However, the current commercial ultrafiltration membranes still prefer traditional small molecules or water-soluble low-molecular-weight additives. The existing amphiphilic polymer additives are synthesized by living polymerization methods, which are relatively difficult to synthesize. For example, Guo Ruiwei et al. Using benzyl carbazole dithioformate as RAFT (reversible addition-fragmentation radical polymerization) transfer reagent, styrene and polyethylene glycol monomethyl ether acrylate as comonomers, via RAFT living radical polymerization technology to synthesize a series of comb-shaped block copolymers with different side chain lengths, number of side chains, and different block relative molecular masses, and use such polymers for hydrophilic modification of the surface of polysulfone membranes, but the synthesis is difficult. cannot be applied on a large scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: Pass nitrogen gas for a period of time into a three-neck flask equipped with a constant pressure dropping funnel, air guide tube and liquid seal device, weigh 5.47g of polyethylene glycol with a molecular weight of 2000, dissolve it in 10.0ml NMP and add it to the constant pressure drop In the liquid funnel (concentration is 0.274mol / L), take by weighing 0.219gNaH (content is 60%), dissolve in 20.0mlNMP and add in the flask (concentration is 0.274mol / L), control the dropping speed of polyethylene glycol, stir After two hours of reaction, the first step reaction was completed.

[0036]After passing nitrogen into the three-necked flask equipped with a water separator and an air duct for a period of time, add 5.01g of bisphenol S, 2.222g of potassium hydroxide (0.0397mol), 0.118g of potassium carbonate (about 0.000860mol), sulfolane (density 1.26g / ml) 20.0ml (25.2g accounts for about 61% of the total mass), xylene (density 0.86g / ml) 10.0ml (8.6g accounts for about ...

Embodiment 2

[0042] Step 1 is as embodiment 1

[0043] Step 2: Mix polyvinyl chloride, polyethersulfone-polyethylene glycol polymer in a ratio of 83% and 17%, and then mix this mixture, polyethylene glycol, and dimethylacetamide according to 18%: 16%: The mass ratio of 66% is used to configure the casting solution. First, add the mixture and dimethylacetamide to the reactor and heat it to about 45 degrees Celsius to stir and dissolve. After the dissolution is uniform, add polyethylene glycol and stir to obtain the casting solution. Let stand to defoam.

[0044] Step 3: Add the casting solution to the material liquid tank of the spinning machine. After the casting solution is sprayed out from the spinneret of the spinning machine, it stays in the room temperature air with a humidity of 55% for 3-5s, and then immerses it at a constant speed for 25 Celsius pure water coagulation bath, after forming, soak in pure water at 25 Celsius for 10 hours, and finally dry in the air.

[0045] The resu...

Embodiment 3

[0047] Step 1 is as embodiment 1

[0048] Step 2: Mix polyvinylidene fluoride, polyethersulfone-polyethylene glycol polymer in a ratio of 83% and 17%, and then mix this mixture, isopropanol, and dimethylformamide according to 18%: 14%: The mass ratio of 68% is used to configure the casting solution. First, add the mixture and dimethylformamide into the reactor and heat it to about 75 degrees Celsius to stir and dissolve. After the dissolution is uniform, add isopropanol and stir to obtain the casting solution. Set for defoaming.

[0049] Step 3: Add the casting solution to the material liquid tank of the spinning machine. After the casting solution is sprayed out from the spinneret of the spinning machine, it stays in the room temperature air with a humidity of 50% for 3-5s, and then immerses it at a constant speed for 25 In a coagulation bath at 100°C, soak in pure water at 25°C for 10 hours after forming, and finally dry in the air.

[0050] The resulting membrane has a re...

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Abstract

The invention provides a hollow fiber separation membrane and a preparation method thereof. The hollow fiber separation membrane is composed of following components in mass percentage: 60-96% of polymeric membrane material and 40-4% of amphiphilic material polyether sulfone-polyethylene glycol polymer. The preparation method of the hollow fiber separation membrane comprises the following steps of: uniformly mixing the polymeric membrane material with the amphiphilic material polyether sulfone-polyethylene glycol polymer and adding the mixture and a solvent into a reaction kettle to be agitated and dissolved; after the mixture are uniformly dissolved, adding an additive to be uniformly agitated to obtain a film casting solution; injecting the film casting solution and an inner gel medium by a shower nozzle into an outer gel medium which is used as distilled water to form a film in a gel bath, so as to obtain a hollow fiber membrane. According to the hollow fiber separation membrane and the preparation method thereof, the amphiphilic material is added into the hollow fiber separation membrane so that the hollow fiber separation membrane has a high throughput and a good anti-pollution performance; and the membrane preparation method is simple in process and the large-scale production is easy to realize.

Description

technical field [0001] The patent of the present invention relates to polymer membrane separation technology, specifically, to a high-throughput pollution-resistant hollow fiber separation membrane and its preparation method. Background technique [0002] With the development of membrane technology, membrane separation has been more and more widely used in all aspects of production and life. Membrane separation technology can not only carry out effective purification, but also recover useful substances. At the same time, it has the characteristics of energy saving, simple equipment, and convenient operation. Therefore, it has been widely used and has shown broad development prospects. Although membrane separation technology has achieved unprecedented development, it does not mean that it has reached a perfect level. In the actual application process, membrane separation technology still faces various problems. Taking polymer membranes for water treatment (microfiltration, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/08
Inventor 肖通虎和磊磊程小飞
Owner NINGBO UNIV
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