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Polyvinyl alcohol-ethylene copolymer honeycomb porous membrane and preparation method thereof

An ethylene copolymer and polyvinyl alcohol technology, which is applied in chemical instruments and methods, membranes, membrane technologies, etc., can solve the problems of difficult to precisely control the morphology, pore size and uniformity of porous membranes, and achieve uniformity and repeatability. Good performance and high controllability

Active Publication Date: 2020-06-30
武汉维晨科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on this principle, it can be known that changes in solvent type, solution concentration, and environmental humidity will affect the morphology of the porous membrane, so it is difficult to accurately control the morphology, pore size, and uniformity of the porous membrane.

Method used

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  • Polyvinyl alcohol-ethylene copolymer honeycomb porous membrane and preparation method thereof
  • Polyvinyl alcohol-ethylene copolymer honeycomb porous membrane and preparation method thereof
  • Polyvinyl alcohol-ethylene copolymer honeycomb porous membrane and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0034] The invention provides a kind of preparation method of polyvinyl alcohol-ethylene copolymer honeycomb porous membrane, comprises the following steps:

[0035] S1. Add polyvinyl alcohol-ethylene copolymer to a mixed solvent of isopropanol and water with a mass ratio of 1:2 to 2:1, heat it to 70 to 85°C, and dissolve it completely to obtain a mass fraction of 7 %~12% polyvinyl alcohol-ethylene copolymer solution.

[0036] The polyvinyl alcohol-ethylene copolymer molecular chain includes a hydrophilic polyvinyl alcohol segment and a hydrophobic polyethylene segment, which is soluble in hot aqueous solution. It is difficult to dissolve polyvinyl alcohol with isopropanol alone. The volatility of water is poor, which is not conducive to the formation of honeycomb porous structure when removing the solvent phase. And because isopropanol and water are miscible, so choose volatile isopropene and water as mixed solvent, utilize the difference of both to polyvinyl alcohol-ethylen...

Embodiment 1

[0049] A polyvinyl alcohol-ethylene copolymer honeycomb porous membrane is prepared by a phase separation spin coating method, comprising the following steps:

[0050] S1. Add polyvinyl alcohol-ethylene copolymer to a mixed solvent of isopropanol and water with a mass ratio of 1:1, heat to 80°C to dissolve it completely, and obtain polyvinyl alcohol with a mass fraction of 8%- Ethylene copolymer solution;

[0051] The molecular weight of the polyvinyl alcohol-ethylene copolymer is about 50,000; the content of polyvinyl alcohol in the polyvinyl alcohol-ethylene copolymer is 80%; the alcohol content of polyvinyl alcohol in the polyvinyl alcohol-ethylene copolymer The resolution is 88%.

[0052] S2. Put the silicon wafer on the turntable of the homogenizer, set the rotating speed to 2000 rpm, and the rotation time is 60s, start the homogenizer, and drop 0.05ml of the polyvinyl alcohol-ethylene copolymer solution obtained in step S1 On the silicon chip, until the glue homogenize...

Embodiment 2～8 and comparative example 1～5

[0057] The polyvinyl alcohol-ethylene copolymer honeycomb porous membrane that embodiment 2~8 and comparative example 1~5 provide, compare with embodiment 1, difference is that, preparation condition is as shown in table 1, other and embodiment 1 They are basically the same and will not be repeated here.

[0058] The preparation conditions of table 1 embodiment 2~8 and comparative examples 1~5

[0059]

[0060]

[0061] see Figure 4 As shown, it can be seen that when the mass fraction of the polyvinyl alcohol-ethylene copolymer solution was 6%, the polyvinyl alcohol-ethylene copolymer film prepared in Comparative Example 3 did not form a honeycomb porous structure, which may be because the solution concentration was too high. When the viscosity is low, the viscosity decreases and the content of the solvent phase is large. When the solvent phase is removed, a large amount of solvent volatilizes, resulting in an increase in the content of condensed water, making it diffi...

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Abstract

The invention provides a polyvinyl alcohol-ethylene copolymer honeycomb porous membrane and a preparation method thereof. The preparation method comprises the following steps: firstly, a polyvinyl alcohol-ethylene copolymer is dissolved in a mixed solvent of isopropanol and water in a mass ratio of (1: 2)-(2: 1) to prepare a polyvinyl alcohol-ethylene copolymer solution with the mass fraction of 7%-12%; then, after a polyvinyl alcohol-ethylene copolymer film is prepared through spin coating, heat treatment is conducted at the temperature 1 to 10 DEG C lower than the boiling point of an azeotrope of isopropanol and water, a solvent phase is removed, and a honeycomb-shaped porous film is formed; and finally, annealing treatment is carried out to obtain the polyvinyl alcohol-ethylene copolymer honeycomb porous membrane. The molecular chain of the selected polyvinyl alcohol-ethylene copolymer comprises a hydrophilic polyvinyl alcohol chain segment and a hydrophobic polyethylene chain segment, and the honeycomb porous membrane with uniform distribution, small pore diameter and uniform pore diameter is prepared through multi-stage solvent volatilization by utilizing the difference of solubility and boiling points of isopropanol and water on the polyvinyl alcohol-ethylene copolymer.

Description

technical field [0001] The invention belongs to the technical field of porous membrane preparation, and relates to a polyvinyl alcohol-ethylene copolymer honeycomb porous membrane and a preparation method thereof, in particular to a polyvinyl alcohol-ethylene copolymer honeycomb porous membrane prepared by a phase separation spin coating method The method and polyvinyl alcohol-ethylene copolymer honeycomb porous membrane. Background technique [0002] Because of the extremely high specific surface area, large roughness and uniform pore structure, the honeycomb porous membrane has very broad application prospects in various aspects such as optoelectronic devices, biomaterials, sensors, template materials, separation and filtration, etc. In recent years, it has received a lot of research attention. At present, the preparation methods of porous membranes mainly include breathing pattern method, emulsion droplet template method, colloidal crystal template method, surfactant sel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/44B01D69/02B01D67/00
CPCB01D67/0013B01D69/02B01D71/44B01D2325/026
Inventor 王栋吴建美赵青华梅涛毛秦岑宋银红尤海宁
Owner 武汉维晨科技有限公司
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