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Local crosslinking ionic membrane with stability and separating property and preparation method thereof

A separation performance, ionic membrane technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problem that the membrane cannot have both high stability and high separation performance, and achieve the effect of good binding force

Active Publication Date: 2015-01-21
YANCHENG TEACHERS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But since –Si(OCH 3 ) 3 and –N + (CH 3 ) 3 Cl - The total content of the group is fixed (100%), and there is a trade-off effect between the two groups, so the membrane cannot have both high stability and high separation performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] (2) Preparation of partially cross-linked ionic membrane

[0030] Add 50mL of QPPO-Br solution (containing 5g of solute) dropwise into the PVA solution with a temperature of 60°C, a volume of 100mL, and a mass concentration of 5% within 0.5h, while stirring. After the dropwise addition, continue to stir and react at 60°C for 12h . The obtained solution was coated on a glass plate, and ventilated and dried for 2 days at room temperature to form a uniform and stable gel layer, that is, a membrane. The membrane was peeled off, and the membrane was placed in an oven with a temperature of 60 ° C. The temperature was raised to 130°C at a rate of h, and the temperature was kept for 4 hours to obtain an uncrosslinked QPPO-Br / PVA ion membrane. Cut the film into an area of ​​90×90mm 2 The diaphragm is sandwiched between two porous partitions, and the nuts around the partitions are used to control the leakage of solution between the non-porous area of ​​the partition and the con...

Embodiment 3

[0051] Example 3 Preparation of SPPO-Na / PVA ion membrane by glutaraldehyde partial cross-linking method

[0052] (1) Preparation of raw materials

[0053] 1) The preparation of the dissolution of PVA and the porous separator is the same as in Example 1.

[0054] 2) the preparation of glutaraldehyde solution, with water as solvent, the solution contains 1.2mol / L Na 2 SO 4 , 0.3mol / L H 2 SO 4 and 0.02mol / L glutaraldehyde.

[0055] 3) Preparation of sodium sulfonated polyphenylene ether (SPPO-Na) solution: SPPO-Na was purchased from Shandong Tianwei Membrane Technology Co., Ltd., and 10 g of sulfonated polyphenylene ether was dissolved in 30 mL of DMF to obtain a mass concentration of 28%. The solution.

[0056] (2) Preparation of partially cross-linked ionic membrane

[0057] Add the SPPO-Na solution (35.7mL) containing 10g of solute dropwise into the PVA solution with a temperature of 75°C, a mass concentration of 5%, and a volume of 50mL within 1h, while stirring, and c...

Embodiment 4

[0063] Example 4 Preparation of SPPO-H / PVA ionic membrane by low-concentration formaldehyde partial cross-linking method

[0064] (1) Preparation of raw materials

[0065] 1) The dissolution of PVA is similar to Example 1, but 63.6g of PVA is soaked in 740mL of water, and the mass concentration after dissolution is 7.5%.

[0066] 2) The preparation of formaldehyde solution, with water as solvent, the solution contains 1.2mol / L Na 2 SO 4 , 1.5mol / L H 2 SO 4 And 2mol / L formaldehyde.

[0067] 3) Porous partition preparation: make two plastic plates with a thickness of 3.5mm, a length of 160mm, and a width of 140mm, and punch 12×10 holes on the surface of the board, the hole spacing is 5mm, the hole diameter is 5mm, and the porosity of the partition is 10.5 %, 10 nuts are fixed around the diaphragm to clamp the diaphragm.

[0068] 4) The configuration of hydrogen sulfonated polyphenylene ether (SPPO-H) solution, soak the Chinese herbal medicine SPPO-Na (Shandong Tianwei Memb...

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Abstract

The invention discloses a local crosslinking ionic membrane with stability and separating property and a preparation method thereof, and belongs to the technical field of membranes. The method comprises the following steps: firstly, blending an ion exchange material solution with a polyvinyl alcohol water solution; coating on a substrate and drying to form a membrane; peeling the membrane and then carrying out heat treatment to obtain an uncrosslinked ion membrane; clamping the uncrosslinked ion membrane between two same porous plastic partition plates and controlling solution leakage not to happen between non-porous regions of the partition plates and the membrane surface contact region; soaking in a crosslinking agent solution and crosslinking; and removing the partition plates and then washing, so as to obtain the local crosslinking ionic membrane. The ionic membrane which is high separating property and is free of stability is subjected to local chemical crosslinking, so that crosslinked-uncrosslinked intermittent distribution is generated on the membrane surface; high stability can be obtained within the crosslinked region; and the uncrosslinked region is kept with high separating property. The crosslinked-uncrosslinked region of the local crosslinking ionic membrane has good binding force, and the stability and the separating property of the membrane are controllable.

Description

technical field [0001] The invention belongs to the technical field of membranes and relates to a partial cross-linking method, which can prepare ion membranes with both stability and separation performance. Background technique [0002] In the field of ion membrane preparation and application, it is difficult to have both high stability and high separation performance. It is often necessary to sacrifice the separation performance of the membrane while improving the membrane stability, and it is often necessary to sacrifice the stability of the membrane to improve the separation performance of the membrane. For ionic membranes that lack stability, the conventional method is to add supports or perform chemical cross-linking. But on the one hand, because the support generally does not have separation performance and has no covalent bond with the ionic membrane material, the ability to enhance the stability of the membrane is limited and the separation effect of the membrane wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J5/22C08L29/04C08L71/12C08K5/07B01D71/38B01D71/52
CPCY02P20/141
Inventor 吴永会赵晓玉茆福林
Owner YANCHENG TEACHERS UNIV
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