Method for preparing superhydrophobic surface by using nano-particles for assisting micromolding

A superhydrophobic surface and nanoparticle technology, which is used in the field of nanoparticle-assisted micromolding to prepare polymer superhydrophobic surfaces, can solve problems such as neglecting functions, and achieve broad market prospects, good controllability and repeatability, and wide application value. Effect

Inactive Publication Date: 2009-09-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the other hand, previous studies have mainly focused on the development of superhydrophobic surfaces

Method used

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  • Method for preparing superhydrophobic surface by using nano-particles for assisting micromolding
  • Method for preparing superhydrophobic surface by using nano-particles for assisting micromolding
  • Method for preparing superhydrophobic surface by using nano-particles for assisting micromolding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Nano-TiO 2 Dispersion: weigh 5g nano-TiO 2 (Zhejiang Hongsheng Material Technology Co., Ltd., HR3) was poured into 95g of absolute ethanol, and 0.15g of KH570 (Nanjing Shuguang Chemical Group Co., Ltd.) was added to adjust the pH to 3.5. Stir for 1 hour to fully hydrolyze KH570. Ultrasound for 4 hours under stirring to obtain uniformly dispersed nano-TiO 2 The slurry is adjusted to a pH value of 7 and placed for storage.

[0039] Preparation of PDMS template: Mix PDMS prepolymer (polydimethylsiloxane, Dow Corning, USA, Sylgard 184) with a mass ratio of 10:1 and its supporting cross-linking agent (Dow Corning, USA, Sylgard 184) After vacuum treatment for 30min, it was cast on the fresh lotus leaf adaxial surface (i.e. ventral surface), placed at room temperature for 24h, then transferred to a 40°C oven to react for 2h, and after curing, the PDMS was peeled off to obtain a template ( figure 1 a is the surface structure of the soft template at a small magnification, b i...

Embodiment 2

[0043] Preparation of ATO / WPU (antimony-doped tin dioxide / water-based polyurethane) thermal insulation coating: first weigh 30g of ATO powder (Shanghai Huzheng Nano Technology Co., Ltd., ATO-P100, nanoscale) and 70g of deionized water, add 0.6g KH570, using agate beads of 3 mm to 6 mm as ball milling beads, ball milling and dispersing for 72 hours at a pH value of 4.5 (adjusting the pH with oxalic acid) to obtain a stably dispersed ATO slurry, take 10 mL of the ATO slurry and mix it into 60 mL of WPU (30%) , to get ATO / WPU thermal insulation coating.

[0044] Preparation of PDMS template and ATO / WPU composite film: PDMS template is prepared with example 1, with oxygen plasma treatment (-0.1MPa under treatment 5 minutes) PDMS template has one side of dimple to make it hydrophilic, then ATO / WPU The thermal insulation coating and pure WPU coating (without ATO) were evenly poured onto two PDMS templates (3×3cm 2 ) on the hydrophilic surface, dried in an oven at 80°C, taken out an...

Embodiment 3

[0046] Nano-TiO 2 The dispersion and the preparation of the PDMS template are the same as in Example 1. Take 100 μL of nano-TiO with a solid content of 5% 2 Slurry was evenly spin-coated on 3 x 3 cm 2 On the PDMS film plate, after it is dried, LDPE (Shanghai Petrochemical, N220) is evenly covered on its surface. Heat LDPE in an oven at 200°C for 30 minutes, and then quickly clamp it with a certain pressure clamp (~500g / cm 2 ), stabilized in an oven for 15 minutes, then took it out to stand at room temperature, cooled, and peeled off to obtain the prepared sample. The sample preparation process is as Figure 9 As shown, the surface microstructure and contact angle are as Figure 10 , Figure 11 shown.

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Abstract

The invention provides a method for preparing a polymer superhydrophobic surface by using nano-particles for assisting micromolding. The method firstly uses a PDMS as a raw material for copying a micro-structure on the surface of a fresh lotus leaf to be used as a soft template, then casts or hot presses the modified nano particles and a polymer on the surface of the PDMS soft template and strips after molding, thereby obtaining the polymer superhydrophobic surface which contains a micro/nano second-order structure on the surface and has a certain function. The method has simple operation process, high efficiency and good controllability and repeatability; as the obtained surface contains the functional nano-particles, the method not only gives the superhydrophobic property to the polymer surface, but also gives a certain function to the superhydrophobic surface, thereby providing a simple and effective way for preparing the superhydrophobic surface and having wide application value and broad market prospect.

Description

(1) Technical field [0001] The invention relates to a method for preparing a polymer superhydrophobic surface by nanoparticle-assisted micromolding. (2) Background technology [0002] When a drop of water is placed on a solid horizontal surface, the water drop will naturally spread or spread to a certain angle to achieve equilibrium. This equilibrium angle is determined by the balance between solid-liquid, liquid-gas, and solid-gas interfacial tensions. Usually This is called the equilibrium contact angle θ. The size of θ is usually a measure of the wettability of the solid surface. When θ<90°, it is called hydrophilic material, and when θ>90°, it is called hydrophobic material. The wettability of the solid surface is one of the important properties of the solid surface, which is determined by the chemical composition and the microscopic geometric structure of the surface. When θ>150°, it is called superhydrophobic surface. Because of its important application p...

Claims

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Application Information

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IPC IPC(8): B29C39/00B29C39/26B29C59/00B29C33/40B29C33/42C08K3/22
Inventor 冯杰钟明强郑建勇黄宝元林玮炜
Owner ZHEJIANG UNIV OF TECH
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