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.
CN110818931AActive Publication Date: 2020-02-21TIANJIN POLYTECHNIC UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN POLYTECHNIC UNIV
Publication Date
2020-02-21

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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