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Composite membrane of biomimetic water catchment, preparation method and usage

A composite film and water collection technology, applied in the direction of layered products, etc., can solve the problems of not being able to meet the needs of water, low water collection efficiency, and high cost, and achieve the effects of improved efficiency, good outdoor stability, and extended service life

Inactive Publication Date: 2006-12-06
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects of the prior art that the water collection efficiency is not high, cannot meet the water needs of the vast water-deficient areas, and the cost is high, and it is not environmentally friendly, thereby providing a water-repellent area with a hydrophilic area and a water-repellent area. Membrane structure, can efficiently collect tiny water droplets in the air to make it usable fresh water, and a biomimetic water-collecting composite film that can defog

Method used

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  • Composite membrane of biomimetic water catchment, preparation method and usage
  • Composite membrane of biomimetic water catchment, preparation method and usage
  • Composite membrane of biomimetic water catchment, preparation method and usage

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Experimental program
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Effect test

Embodiment 1

[0069] 1) Preparation of hydrophobic polymer solution:

[0070] Mix the two components of PDMS (glue solution—also called A component or A component, and solidification solution—also called B component or B component) in 10:1 parts by weight, and then add it with the glue Liquid equal weight of butyl acetate, the viscosity of the mixed system is reduced, and the hydrophobic polymer solution is prepared for subsequent use;

[0071] 2) Preparation of hydrophilic polymer solution:

[0072] Add 3g of commercially available silica hydrosol particles (average particle diameter is 5 μm) and 180g of formic acid solution (commercially available) in the reaction flask, put into the ultrasonic pool and fully ultrasonically disperse for 30 minutes, then add 30g of nylon 6 ( PA6) polymer, dissolved at 40°C for 20 minutes to obtain a hydrophilic polymer solution doped with inorganic oxide particles, set aside;

[0073] 3) Preparation of composite film:

[0074] Evenly roll-coat the PDMS ...

Embodiment 2

[0077] 1) Preparation of hydrophobic polymer solution:

[0078] With the step 1) of embodiment 1);

[0079] 2) Preparation of hydrophilic polymer solution:

[0080] Add 6g of commercially available titanium dioxide hydrosol particles (average particle diameter is 50 μm) and 180g of formic acid solution (commercially available) in the reaction flask, mechanically stir and disperse for 30 minutes, add 30g nylon 4 (PA4) polymer again, at 50 Dissolve at ℃ for 20 minutes to obtain a hydrophilic polymer solution doped with inorganic oxide particles, which is set aside;

[0081] 3) Preparation of composite film:

[0082] Evenly roll-coat the PDMS solution prepared in step 1) on 2×1m 2 on a polyethylene sheet, dried for 20 minutes to form a hydrophobic polymer film; The completely dried hydrophobic polymer coating forms protrusions with a diameter of 0.7 mm, a height of 0.4 mm, and a distance of 2 mm between the center points of the protrusions on the coating; finally, drying at 5...

Embodiment 3

[0085] 1) Preparation of hydrophobic polymer solution:

[0086] With the step 1) of embodiment 1);

[0087] 2) Handling glass beads:

[0088] Immerse glass beads with a diameter of 0.7 mm in 5 wt % hydrofluoric acid solution (commercially available), treat at room temperature for 1 hour, filter out the glass beads, wash the glass beads with clear water for 3 times, dry, and set aside;

[0089] 3) Preparation of composite film:

[0090] Evenly roll-coat the PDMS solution prepared in step 1) on 2×1m 2 On a polyethylene sheet, dry for 20 minutes to form a hydrophobic polymer film; then pour the glass beads treated in step 2) into a porous sieve bucket with a pore size of 1mm, pour the porous sieve bucket, and roll over the not completely dried Hydrophobic polymer coating, forming protrusions on the coating with a diameter of 0.5-0.8 mm, a height of 1 mm, and a distance between the center points of the protrusions of 3 mm; finally, drying at 50°C for 2 hours to obtain the biomi...

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Abstract

A bionic composite film for collecting fog drops or dispersing dense fog is composed of a substrate, a hydrophobic polymer film on said substrate, and several lines of small circular humps made of glass microbead or hydrophilic polymer containing inorganic oxide particles. Its preparing process includes such steps as coating the solution of hydrophobic polymer on the substrate, and applying the glass microbeads or the concentrated solution of hydrophilic polymer onto the film of hydrophobic polymer by a rolling screen.

Description

technical field [0001] The invention relates to a bionic water-collecting composite film, a preparation method and application thereof. Background technique [0002] Dense fog is a kind of meteorological disaster. It not only brings inconvenience to people's travel, but sometimes even causes loss of life and property. Therefore, researches on low-cost artificial fog removal have been carried out abroad. On the other hand, with the global warming and the rapid increase of population, the problem of water shortage has become more and more prominent. For example, in our country, due to the diversity of geography and climate, many areas of our country are always in a state of water shortage, which greatly restricts the local economic development, especially the development of the western region. Recently, a new technical system - "foggy water engineering" is quietly emerging in some countries and regions of the world. The method of "catching fog and water" can reduce and elimi...

Claims

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Application Information

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IPC IPC(8): B32B3/30
Inventor 江雷黄忠兵
Owner INST OF CHEM CHINESE ACAD OF SCI
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