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Method for preparing polyvinyl composite nanofiltration membrane through reversed-phase interfacial polymerization

A composite nanofiltration membrane, polyethylene-based technology, applied in the field of nanofiltration membranes

Pending Publication Date: 2022-02-01
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that a continuous and intact polyamide layer cannot be prepared on a polyethylene porous membrane by the traditional normal phase interfacial polymerization method, the present invention provides a method for preparing a polyethylene-based composite nanofiltration membrane by reverse phase interfacial polymerization. The filter membrane includes: polyethylene porous membrane support layer, polyamide dense layer

Method used

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  • Method for preparing polyvinyl composite nanofiltration membrane through reversed-phase interfacial polymerization
  • Method for preparing polyvinyl composite nanofiltration membrane through reversed-phase interfacial polymerization
  • Method for preparing polyvinyl composite nanofiltration membrane through reversed-phase interfacial polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Take a polyethylene porous membrane with a thickness of 9 μm as the support layer, weigh 0.075 g of trimesoyl chloride and dissolve it in 100 mL of n-hexane, contact the polyethylene porous membrane with the trimesoyl chloride solution for 4 minutes, and then dry it.

[0028] (2) Weigh 0.2g of piperazine and dissolve it in 100mL of deionized water, contact the side of the film obtained in step (1) that has been in contact with the organic phase monomer with the water phase monomer for 1min, and then bake in an oven at 60°C for 15min .

[0029] (3) Weigh 200 mL of isopropanol with a purity of 99.7%, soak the film obtained in step (2) in the solution for 5 minutes, and then take it out for testing.

[0030] The thickness of a polyethylene-based nanofiltration membrane prepared in Example 1 is 10±3um. The nanofiltration membrane prepared in this example was put into a performance evaluation device, and the experimental conditions were: 0.6Mpa, pre-compressed for 1 hou...

Embodiment 2

[0032] (1) Take a polyethylene porous membrane with a thickness of 16 μm as the support layer, weigh 0.075 g of trimesoyl chloride and dissolve it in 100 mL of n-hexane, contact the polyethylene porous membrane with the trimesoyl chloride solution for 4 minutes on one side and then dry it.

[0033] (2) Weigh 0.1g of piperazine and dissolve it in 100mL of deionized water, contact the side of the film obtained in step (1) that has been in contact with the organic phase monomer with the water phase monomer for 1 min, and bake in an oven at 60°C for 15 min .

[0034] (3) Weigh 200 mL of isopropanol with a purity of 99.7%, soak the film obtained in step (2) in the solution for 5 hours, and then take it out for testing.

[0035] The thickness of a polyethylene-based nanofiltration membrane prepared in Example 2 is 17±3um. The nanofiltration membrane prepared in this example was put into a performance evaluation device, and the experimental conditions were: 0.6Mpa, pre-compressed fo...

Embodiment 3

[0037] (1) Take a polyethylene porous membrane with a thickness of 16 μm as the support layer, weigh 0.075 g of trimesoyl chloride and dissolve it in 100 mL of n-hexane, contact the polyethylene porous membrane with the trimesoyl chloride solution for 4 minutes on one side and then dry it.

[0038] (2) Weigh 0.2g of piperazine and dissolve it in 100mL of deionized water, contact the side of the film obtained in step (1) that has been in contact with the organic phase monomer with the water phase monomer for 1min, and then bake in an oven at 60°C for 15min .

[0039] (3) Weigh 200 mL of isopropanol with a purity of 99.7%, soak the film obtained in step (2) in the solution for 5 hours, and then take it out for testing.

[0040] The thickness of a polyethylene-based nanofiltration membrane prepared in Example 3 is 17±3um. The nanofiltration membrane prepared in this example was put into a performance evaluation device, and the experimental conditions were: 0.6Mpa, pre-compressed...

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Abstract

The invention discloses a method for preparing a polyvinyl composite nanofiltration membrane through reversed-phase interfacial polymerization. The method comprises the following steps: performing single-sided contact on a polyethylene porous membrane and an organic phase monomer solution for 0.1-15 minutes; airing the liquid, enabling one surface, which is in contact with the organic phase monomer solution, of the obtained membrane to be in contact with the water phase monomer solution for 0.1-15 minutes; then drying the solution, and soaking the membrane in a solution containing a surfactant for 5 seconds to 48 hours; and then taking out to obtain the polyvinyl composite nanofiltration membrane. Herein, the polyamide layer is attached to the polyethylene porous membrane through a reversed-phase interfacial polymerization method, the single-layer polyethylene porous membrane is used for replacing a traditional polyester non-woven fabric and polysulfone ultrafiltration layer two-layer structure to serve as a supporting layer, and the thickness and the preparation cost of the membrane can be greatly reduced; besides, the prepared polyamide nanofiltration membrane attached to the polyethylene porous membrane is activated and wetted by a surfactant, is subjected to nanofiltration separation in a water phase system, and has high salt rejection rate and good water flux.

Description

technical field [0001] The invention relates to the field of nanofiltration membranes, in particular to a preparation method based on polyethylene composite nanofiltration membranes. Background technique [0002] Nanofiltration membranes have developed rapidly since the 1980s. Most of the commercialized nanofiltration membranes at home and abroad are composed of an ultra-thin separation layer with nano-scale pore size on the microporous ultrafiltration membrane through normal phase interfacial polymerization. However, the microporous ultrafiltration membrane is composed of polyester non-woven fabric and polysulfone ultrafiltration layer. Now commercialized nanofiltration membranes are made of polyester non-woven fabric, polysulfone ultrafiltration layer, polyamide The separation layer consists of three layers. Among them, there is no polyester non-woven fabric in China that can produce qualified products, so so far my country's non-woven fabrics have largely relied on forei...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/26B01D71/56
CPCB01D61/027B01D69/12B01D67/0006B01D71/26B01D71/56
Inventor 薛立新王庆一张秀敏苌现
Owner ZHEJIANG UNIV OF TECH
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