Polymer microporous membrane as well as preparation method and application thereof

A polymer and microporous membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., to achieve the effects of broadening applicability, improving water drawing efficiency, and reducing heat conduction

Active Publication Date: 2018-11-27
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the support material layer, the water-absorbing material layer and the light-absorbing material layer are independent, and the water-absorbing channel is long, so there is still a lot of room for improvement in the utilization of light energy and heat energy.

Method used

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  • Polymer microporous membrane as well as preparation method and application thereof
  • Polymer microporous membrane as well as preparation method and application thereof
  • Polymer microporous membrane as well as preparation method and application thereof

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preparation example Construction

[0035]The present invention also provides a method for preparing a polymer microporous membrane for light-to-heat conversion, using non-woven fabric as a template, comprising the following steps:

[0036] S1, dissolving the polymer in an organic solvent to obtain a polymer casting solution;

[0037] S2, coating the casting solution obtained in step (1) on the surface of the non-woven fabric to form a nascent film;

[0038] S3, transfer the non-woven fabric with the nascent film to a coagulation bath and solidify at 10°C to 30°C to obtain a polymer microporous film with a non-woven fabric, wherein the coagulation bath is an aqueous solution of sodium chloride or aqueous ammonia and hydrophilic Water-based polymer and the mixture with step (1) organic solvent, during the solidification process, sodium chloride or ammonia water induces the phase transition of polymer precipitation, driving the polymer in the casting solution to stay away from the surface of the non-woven fabric i...

Embodiment 1

[0052] Step (1) Add 16g of polyvinylidene fluoride and 84g of triethyl phosphate to the reaction kettle, and mechanically stir at 250r / min at 70°C for 6 hours, then vacuum defoaming for 20 minutes, and then stand for defoaming for 10 hours to obtain Polyvinylidene fluoride casting liquid;

[0053] Step (2) uniformly coating the polyvinylidene fluoride casting solution on the support layer made of non-woven fabric with a 250-micron scraper to obtain a nascent film;

[0054] Step (3) Transfer the nascent membrane into a coagulation bath at 25°C and immerse it for 5 minutes, then transfer it to deionized water at 60°C and place it for 24 hours to obtain a polyvinylidene fluoride microporous membrane with a non-woven support layer, The coagulation bath is to add 2g N-vinylpyrrolidone, 1.5g vinyltrimethoxysilane and 0.1g azobisisobutyronitrile to 50mL triethyl phosphate, react at 60°C for 16 hours, and then mix with 50mL mass fraction Prepared by blending 6% sodium chloride aqueou...

Embodiment 2

[0067] Step (1) Add 13g of polyvinylidene fluoride, 5g of polyethylene glycol, and 82g of N,N-dimethylformamide into the reactor, and mechanically stir at 200r / min at 80°C for 5 hours, and then vacuum defoam for 30 Minutes, then stand for degassing for 15 hours to obtain polyvinylidene fluoride casting solution;

[0068] Step (2) uniformly coating the polyvinylidene fluoride casting solution on the non-woven fabric support layer with a 300-micron scraper to obtain a nascent film;

[0069] Step (3) Transfer the nascent film into a reactive coagulation bath at 20°C for 8 minutes, then transfer it to deionized water at 55°C and place it for 30 hours to obtain a microporous polyvinylidene fluoride with a non-woven support layer film, wherein the reactive coagulation bath is 1g N-vinylpyrrolidone, 1.5g hydroxyethyl methacrylate, 2g vinyltriethoxysilane and 0.14g dioxane in 50mL N,N-dimethylformamide Azodiisoheptanonitrile was prepared by blending with 80mL ammonia solution with a ma...

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Abstract

The invention relates to a polymer microporous membrane. The polymer microporous membrane comprises a first surface and a second surface which have different functions, wherein the first surface is aphoto-thermal conversion surface, and the second surface is hydrophobic self-floating surface. The polymer microporous membrane integrates the functions of self-floatation, thermal insulation and water absorption, the length of a water absorption channel in a photo-thermal evaporation process can be further reduced, the water absorption efficiency is improved, the salting out phenomenon in the evaporation process is inhibited, the thermal conduction is reduced, the loss of heat energy in the process is reduced, the utilization rate of sunshine is increased, and the evaporation efficiency is improved. Besides, the polymer microporous membrane is prepared by virtue of the methods of surface induced crystallization, hydrophilic polymer surface permeation and template printing, the polymer microporous membrane with hydrophilic first surfaces with different thickness can be obtained, the immersion depth of the polymer microporous membrane during the self-floatation on the water surface is realized, and the applicability of the polymer microporous membrane is broadened.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of polymer microporous membranes, in particular to a polymer microporous membrane integrating self-floating, heat insulation and water absorption and a preparation method thereof. Background technique [0002] The development of seawater desalination technology and obtaining fresh water from the ocean has become an effective technical means to alleviate the shortage of water resources. After more than half a century of development, seawater desalination has formed an industrial technology with distillation and reverse osmosis as the mainstream. Membrane reverse osmosis technology has the advantages of high desalination, small footprint, and easy continuous integration of technology, and has become a popular technology in recent years. However, membrane reverse osmosis is a physical separation method driven by high pressure. The desalination system is complex, energy consumptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/34B01D71/68
CPCB01D67/0009B01D67/0011B01D67/0016B01D69/02B01D71/34B01D71/68B01D2325/36
Inventor 刘富林海波李田田方齐乐韩秋
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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