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A hydrophilic-hydrophobic bipolar composite membrane and method for preparing same

A technology of composite membranes and hydrophobic membranes, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of inability to perform full heat recovery, difficulty in satisfying the penetration of other gas molecules with high moisture permeability at the same time, and achieve Effects of reduced moisture diffusion resistance, strong adhesive force, and high water vapor permeation velocity

Inactive Publication Date: 2006-11-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Japanese patent specification No. JP11090194 announced on April 6, 1999 proposes to use a polyetherimide membrane to dehumidify the air. The polyetherimide dehumidification membrane is a hollow fiber membrane, and the hollow fiber membrane is made of Polyether, imide-polyetherimide, and imide are mixed. The inner surface of the film is coated with a layer of polyvinylpyrrolidone or a layer of moisturizing agent. The film can effectively inhibit the formation of holes. And can improve durability, the Chinese utility model patent specification of CN2245205Y announced on January 15th, 1997 proposes to adopt heat exchange film heat exchanger to carry out dehumidification and heat recovery of air, and the material of heat exchange film can adopt metal or non-metallic material ( Such as plastic film), but this kind of heat exchanger can only recover the sensible heat part, not the full heat recovery
[0008] The disadvantage of existing membranes is that it is difficult to meet the contradiction between high moisture permeability and blocking the penetration of other gas molecules at the same time

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0051] Stir 4g of polyvinyl alcohol and 0.12g of lithium chloride with 120g of deionized water at 90°C for 1 hour to prepare a polyvinyl alcohol solution, let the above solution stand for 1 day to form a casting solution; pour the above casting solution on On a 100 μm polyvinylidene fluoride film, spread it evenly, and dry the above-mentioned coated composite film naturally in the air for 1 day; configure an aqueous solution of a crosslinking agent, wherein the mass concentration of hydroxysuccinic acid is 1%, and the mass concentration of acetic acid is 3%. The above-mentioned composite film was soaked in the cross-linking agent aqueous solution for 20 seconds, picked up, air-dried, then immediately transferred to an oven at 70° C., and baked for 30 minutes to complete the preparation.

Embodiment 2

[0053] Stir 2g of polyvinyl alcohol and 0.10g of lithium chloride with 100g of deionized water at 95°C for 1.5 hours to prepare a polyvinyl alcohol solution, let the above solution stand for 2 days to form a casting solution; pour the above casting solution on On a 30 μm polyethylene film, spread it evenly, and dry the above-mentioned composite film naturally in the air for 1.5 days; configure an aqueous solution of a cross-linking agent, wherein the mass concentration of hydroxysuccinic acid is 2%, and the mass concentration of acetic acid is 4%, and the above-mentioned compound The film was soaked in the cross-linking agent aqueous solution for 25 seconds, picked up, air-dried, and then immediately transferred to an oven at 80°C for 40 minutes to complete the preparation.

Embodiment 3

[0055] Stir 15g of polyvinyl alcohol and 0.15g of lithium chloride with 150g of deionized water at 100°C for 2 hours to prepare a polyvinyl alcohol solution, leave the above solution for 3 days to form a casting solution; pour the above casting solution on On a 70 μm polypropylene film, spread it evenly, and dry the above-mentioned composite film naturally in the air for 2 days; prepare an aqueous solution of a cross-linking agent, wherein the mass concentration of hydroxysuccinic acid is 3%, and the mass concentration of acetic acid is 5%, and the above-mentioned compound The film was soaked in the cross-linking agent aqueous solution for 30 seconds, picked up, air-dried, and then immediately transferred to an oven at 100°C for 50 minutes to complete the preparation.

[0056] 2. Select sodium polyacrylate as the main component of the hydrophilic membrane

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Abstract

The invention discloses a hydrophilic-hydrophobic bipolar complex membrane and the method for preparing the same. Said complex membrane comprises two layers, the bottom one is porous supporting system, and upper one is ultra-fine cerebral cortex; said porous supporting system is hydrophobic membrane and nonpolar, to avoid condensation of water vapour; ultra-fine membrane is hydrophilic membrane and polar, and LiCl with 1-5% by weight of main component can be doped to increase polarity; the thickness of porous supporting system is 30-100 um, and that of ultra-fine cerebral cortex is 5-20 um. The invention is characterized by simple process and low cost. The prepared bipolar complex membrane is characterized by good penetration property and gas selectivity, high intensity and wide application in water treatment, air conditioner engineering, energy, chemical industry, metallurgy and biochemical engineering. The product is especially suitable for air dehumidification and heat recycle of air cinditioner new gas.

Description

technical field [0001] The invention belongs to the field of air dehumidification and total heat recovery of air conditioners, and in particular relates to a hydrophilic-hydrophobic bipolar composite membrane for realizing air dehumidification and total heat recovery of air conditioners and a preparation method thereof. Background technique [0002] At present, because people are paying more and more attention to the quality of indoor air, they are looking for a method that can make the process of air dehumidification and air heat recovery continue, without corrosion problems, without valve switching, without moving parts, high system reliability, and easy maintenance. Dehumidification and total heat recovery methods with low energy consumption and low maintenance costs. And this is the advantage of membrane dehumidification and total heat recovery compared with traditional dehumidification and total heat recovery methods. [0003] Traditional air dehumidification methods i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D53/22B01D53/26F24F3/14
Inventor 张立志
Owner SOUTH CHINA UNIV OF TECH
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