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Blended dehumidifying film and preparation method thereof

A wet film and blending technology, applied in the field of blended dehumidification film and its preparation, can solve the problems of limited moisture absorption capacity, easy rupture of moisture absorption materials, low moisture absorption stability, etc., and achieve the effects of stable structure and improved moisture absorption capacity.

Active Publication Date: 2020-02-21
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods fix the desiccant on the substrate by dipping or coating, and the moisture absorption stability is not high after long-term use.
[0005] CN108704453A discloses a preparation method of an air desiccant, which solves the problem that hygroscopic materials are easily broken after absorbing moisture, but the production methods such as freeze-drying and suction filtration are very cumbersome during production
The above results in its limited moisture absorption capacity

Method used

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  • Blended dehumidifying film and preparation method thereof
  • Blended dehumidifying film and preparation method thereof
  • Blended dehumidifying film and preparation method thereof

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preparation example Construction

[0041] The embodiment of the present invention proposes a method for preparing a blended dehumidification membrane, which includes the following steps:

[0042] a) Drying the crystalline hydrophobic polymer and polyvinyl alcohol (PVA) separately for subsequent use;

[0043] b) successively adding the PVA obtained in step a) and the crystalline hydrophobic polymer obtained in step a) to the solvent as solutes, and after mixing, adding inorganic hygroscopic particles to obtain a casting solution;

[0044] c) Scraping the film by using the casting solution obtained in step b) to obtain a blended dehumidification film.

[0045] The embodiment of the present invention blends specific multi-component polymers, uses crystal grain aggregates of crystalline hydrophobic polymers as the skeleton, and hydrophilic polymer PVA as a moisture absorption channel and grain aggregate binder, and inorganic moisture absorption Particles are used as fast moisture-absorbing carriers, and the method o...

Embodiment 1

[0070] Example 1 A kind of preparation method of blend dehumidification film

[0071] a) Place PVDF and PVA in an oven at 50°C for 4 hours to dry for later use.

[0072] b) Using dimethyl sulfoxide (DMSO) as a solvent, PVA and PVDF as solutes, and the concentration of the casting solution is 20 wt%. First mix a certain amount of PVA and DMSO, and stir in a water bath at 60°C-90°C for 1 hour; after the PVA is completely dissolved in DMSO, add a certain amount of PVDF and continue stirring for 1 hour; Particles of calcium chloride were added and stirred for 2 hours, and vacuum degassed for 1 hour to obtain a uniform casting solution.

[0073] c) Use a 0.5mm scraping rod (heat the scraping rod to 60°C) to scrape the film on the PE film, place the film in the air for 48 hours, and store it in a vacuum seal after the solvent in the film is completely evaporated.

[0074] Among them, the mass ratio of PVA to PVDF is 1:4; the mass ratio of calcium chloride to polymer blend is 1:4...

Embodiment 2

[0075] Example 2 A kind of preparation method of blend dehumidification film

[0076] Same as Example 1, the difference is that the concentration of the casting solution is 10wt%.

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Abstract

The invention provides a blended dehumidifying film and a preparation method thereof, belonging to the technical field of films. The method comprises the following steps: a) respectively drying a crystalline hydrophobic polymer and polyvinyl alcohol for later use; b) sequentially adding the polyvinyl alcohol obtained in the step a) and the crystalline hydrophobic polymer obtained in the step a) into a solvent as solutes, carrying out mixing, and adding inorganic moisture absorption particles to obtain a film casting solution; and c) performing film scraping by adopting the film casting solution obtained in the step b) so as to obtain the blended dehumidifying film. The obtained blended dehumidifying film is mainly used for air dehumidification. According to the invention, multi-component polymers are blended, a solvent evaporation induced phase separation method is improved, and the adding sequence of all the components is reasonably adjusted, so the blended dehumidifying film which isstable in structure, high in moisture absorption rate, large in moisture absorption capacity and stable in mechanical property is prepared in one step.

Description

technical field [0001] The invention belongs to the technical field of membranes, and in particular relates to a blended dehumidification membrane and a preparation method thereof. Background technique [0002] At present, there are many air dehumidification methods, including cooling dehumidification, solid adsorption dehumidification, membrane dehumidification, etc., and membrane dehumidification, as one of the many dehumidification methods, has the advantages of continuous dehumidification process and no corrosion problems. Research hotspots. However, membrane dehumidification often requires a large driving force and requires high mechanical strength of the membrane. Therefore, many researchers focus on reducing the mass transfer resistance and improving the mechanical strength of the membrane. [0003] For example, Zhang Lizhi et al. (Three-dimensional pore-scale flow and mass transportthrough composite asymmetric membranes[J]. Science and Technology for the Built Envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L27/16C08L29/04C08K3/16B01D53/26
CPCB01D53/261B01D2257/80C08J5/18C08J2327/16C08J2429/04C08K2003/162
Inventor 李娜娜王雪陆永吉张佳晨
Owner TIANJIN POLYTECHNIC UNIV
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