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High-selectivity asymmetric moisture-permeable film as well as preparation method and application thereof

A high-selectivity, moisture-permeable membrane technology, applied in applications, separation methods, semi-permeable membrane separation, etc., can solve problems such as difficulty in coordinating high permeability and high selectivity, inability to perform full heat recovery, and unfriendly materials , to achieve the effects of saving production costs, environmental protection in the production process, and simplifying the preparation process

Active Publication Date: 2011-01-19
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 preferably coated with a layer of polyvinylpyrrolidone or a layer of moisturizing agent. The film can effectively inhibit the formation of holes. Formed and can improve durability, the Chinese utility model patent specification CN2245205Y announced on January 15, 1997 proposes to use a heat exchange film heat exchanger for air dehumidification and heat moisture recovery. The material of the heat exchange film can be metal or non-metallic. Metal materials (such as plastic films), but this kind of heat exchanger can only recover the sensible heat part, and cannot perform full heat recovery
Due to the diffusion coefficient of solute in solid (-8 cm 2 / s) is very small, the biggest disadvantage of existing membranes is that it is difficult to coordinate the contradiction between high permeability and high selectivity, and the preparation cost is too high, and the materials used are not environmentally friendly

Method used

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  • High-selectivity asymmetric moisture-permeable film as well as preparation method and application thereof
  • High-selectivity asymmetric moisture-permeable film as well as preparation method and application thereof
  • High-selectivity asymmetric moisture-permeable film as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An aqueous acetic acid solution was prepared in a conical flask, wherein the mass of acetic acid was 58.7 g and the mass of water was 29.3 g, and 12 g of cellulose acetate was added. Heat and stir at 50°C for 3 hours until it becomes uniform as a casting solution, and let stand for defoaming for 24 hours before use. Apply the casting solution on a clean glass plate, and use a scraper to control the thickness of the film to 150 μm. Immediately put it into a gel bath to form a wet film, and the gel medium used is water. After 5 minutes, peel off the film from the glass plate, put it in clean tap water and let it stand for 36 hours to remove the solvent. The film after solvent removal was flattened with a glass plate, and dried at 70°C for 2 hours to prepare a high-selectivity asymmetric moisture-permeable film.

[0038] The highly selective asymmetric moisture-permeable membrane prepared by the above method is a membrane with a two-layer structure. Such as figure 1 As...

Embodiment 2

[0040] Aqueous acetic acid solution was prepared in a Erlenmeyer flask, the mass of acetic acid was 49.5 g and the mass of water was 40.5 g, and 10 g of cellulose acetate was added. Heat and stir at 45°C for 4 hours until it becomes uniform as a casting solution, and let stand for defoaming for 12 hours before use. Spread the non-woven fabric on the glass plate, then apply the casting solution on the non-woven fabric, adjust the thickness of the scraped film to 300 μm with a mechanical scraping machine, and place it in the air for 24 hours after scraping to let the solvent volatilize naturally. The membrane formed after the solvent evaporated naturally was placed in a hot air drying oven at 70°C for 2 hours, and the highly selective asymmetric moisture-permeable membrane was prepared after the solvent evaporated naturally.

[0041] The highly selective asymmetric moisture-permeable membrane prepared by the above method is a membrane with a two-layer structure. Such as figure...

Embodiment 3

[0043] Prepare polyethylene glycol aqueous solution in conical flask, wherein polyvinyl alcohol 14g, the quality of water is 86g. Heat and stir at 80°C for 6 hours until it becomes uniform as a casting solution, and let stand for defoaming for 24 hours before use. Spread the non-woven fabric on a glass plate, and then apply the casting solution on the non-woven fabric, and use a mechanical film coating machine to control the thickness of the film to 200 μm. Immediately put it into the gel bath to prepare the film by wet method. In this method, 80 g of sodium hydroxide is added into the saturated sodium sulfate solution according to the ratio of every 1000 ml of the solution as the gel medium. After 5 minutes, peel off the film from the glass plate, put it in clean tap water and let it stand for 36 hours to remove impurities. The film after solvent removal was flattened with a glass plate, and dried at 70°C for 2 hours to prepare a high-selectivity asymmetric moisture-permeab...

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Abstract

The invention discloses a high-selectivity asymmetric moisture-permeable film as well as a preparation method and application thereof. The preparation method is a one-step method, includes a dry method and a wet method and comprises the following specific steps: (1) dissolving hydrophilic polymer in a corresponding solvent to prepare into a hydrophilic polymer solution, uniformly stirring while heating, standing and defoaming for later use as a film casting solution, wherein the hydrophilic polymer content of the solution is 5-20wt.%; (2) preparing a film by using the dry method or the wet method; and (3) drying the film to obtain the moisture-permeable film. The film has a two-layer structure composed of a porous support layer and an ultrathin skin layer, wherein the porous support layeris a spongy porous cellulose structure with the thickness of 30-80 mu m; and the ultrathin skin layer is a compact cellulose structure with thickness of 2-10 mu m. By using the low poisonous solvent and the nonpoisonous additives, the invention enables the production process to be more environment friendly, effectively simplifies the preparation process and greatly saves the production cost.

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 highly selective asymmetric moisture-permeable membrane for realizing air dehumidification and total heat recovery of air conditioners and a preparation method thereof. Background technique [0002] As epidemic diseases such as SARS and H1N1 threaten people's lives, improving indoor air quality has received great attention. Fresh air circulation remains an effective and economical way to improve indoor air quality. However, the energy consumption of dealing with fresh air accounts for 20-40% of the total energy consumption of air conditioners, which is even much larger in the hot and humid summer in southern my country. In order to effectively save energy, HVAC researchers have been seeking a low-energy fresh air heat and humidity recovery process for decades. Membrane dehumidification and membrane heat and moisture r...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D67/00B01D69/10F24F13/00B01D53/26
Inventor 张立志张新儒裴丽霞
Owner SOUTH CHINA UNIV OF TECH
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