Material with bionic hydrophobic-hydrophilic surface and preparation method and application of material

A hydrophilic surface, rusty technology, applied in the field of bionic materials, can solve the problems of short service life, complicated process, high cost, etc., and achieve the effect of excellent water collection performance

Active Publication Date: 2020-04-28
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above method can realize dropwise condensation and improve the condensation heat transfer efficiency, the cost is high, the process

Method used

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  • Material with bionic hydrophobic-hydrophilic surface and preparation method and application of material
  • Material with bionic hydrophobic-hydrophilic surface and preparation method and application of material
  • Material with bionic hydrophobic-hydrophilic surface and preparation method and application of material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The following combination figure 1 The specific steps of the above preparation method are shown.

[0035] First, the hydrophilic microparticles are dispersed in the hydrophobic polymer (ie film-forming resin) to obtain a dispersion.

[0036] The kind of the above-mentioned film-forming resin is not limited. The film-forming resin can be water-based resin and / or solvent-based resin (water-based resin is a resin system with water as a dispersion medium, and the resin and water form a solution, and after the water volatilizes, a resin film material is formed. And the solvent-based resin is Resin system with organic solvent as dispersion medium). The water-based resin includes but not limited to one or more of water-based acrylic resin, water-based polyurethane, and derivatives thereof. The solvent-based resin includes, but is not limited to, one or more of solvent-based acrylic resin, solvent-based epoxy phenolic resin, solvent-based epoxy resin, solvent-based polyureth...

Embodiment 1

[0060] Hydrophilic SiO with a diameter of 85 μm 2 Ultrasonic dispersion of microspheres in aqueous acrylic resin to obtain hydrophilic SiO 2 A homogeneous dispersion with a mass fraction of microspheres of 10 wt%.

[0061] The dispersion is uniformly coated on the stainless steel substrate by dipping to obtain a micron-scale concave-convex structure and a fully hydrophobic surface (such as figure 2 shown).

[0062] Sand the raised hydrophilic SiO lightly with dry sandpaper 2 Hydrophobic layer on the surface of microspheres, removing hydrophilic SiO 2 A water-based acrylic resin layer wrapped on the surface of the microspheres to obtain a partially hydrophilic surface (such as image 3 shown).

[0063] N on the coating surface 2 Plasma treatment was carried out with a treatment power of 300w, a pressure of 30-60pa, and a treatment time of 5 minutes to construct a nanoscale array and obtain a bionic hydrophobic-hydrophilic surface with a micro-nano composite structure (su...

Embodiment 2

[0066] Hydrophilic titanium oxide with a diameter of 40 μm was uniformly dispersed in the water-based polyurethane by magnetic stirring to obtain a dispersion liquid with a mass fraction of hydrophilic titanium oxide of 15 wt%.

[0067] The dispersion liquid is uniformly scraped and coated on the polyethylene substrate to obtain a micron-scale concave-convex structure and a fully hydrophobic surface.

[0068] Laser etching is used to etch the nanoscale structure on the surface of the coating to obtain a biomimetic hydrophobic-hydrophilic surface with a micro-nano composite structure.

[0069] Cut out a square film of 2cm x 2cm, and use a water collection device to conduct a water vapor collection test.

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Abstract

The invention discloses a material with a bionic hydrophobic-hydrophilic surface and a preparation method and application of the material. The material with the bionic hydrophobic-hydrophilic surfaceis a material with a micro-nano composite hydrophobic-hydrophilic surface which is formed by constructing nano protrusions on composite surfaces alternately existing between hydrophilic-hydrophobic regions with hydrophilic micrometer protrusions. The distribution density of the micrometer protrusions is 1,000/cm<2>-3,000/cm<2>.

Description

technical field [0001] The invention belongs to the field of bionic materials, in particular to a bionic hydrophobic-hydrophilic surface and its preparation method and application. Background technique [0002] Water resources are the source of life. Although the total reserves of water resources are large, most of them exist in the form of seawater, but the usable freshwater resources are very limited, which seriously restricts people's lives. Especially in arid desert areas, not only the surface fresh water resources are very scarce, but also the rainfall is low and water resources are scarce. However, these places generally have a large temperature difference between day and night, and the air humidity is high at night. Therefore, some efficient water collection materials can be designed to capture fresh water resources in the air to alleviate the water resource crisis in these areas. [0003] Water vapor condensation is divided into two modes: drop condensation and film...

Claims

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Application Information

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IPC IPC(8): B05D5/08B05D5/04C09D133/04C09D7/61C09D163/04C09D163/00
CPCB05D5/08B05D5/04C09D133/04C09D7/61C09D175/04C09D163/04C09D7/70C09D163/00C09D7/69C08K2003/2241C08K7/18C08K3/22C08K3/36
Inventor 高彦峰唐宇韡陈长李玉萍
Owner SHANGHAI UNIV
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