Preparation method and application of super hydrophobic surface with composite microstructure

A technology of composite microstructure and superhydrophobic surface, which is applied in the field of preparation of superhydrophobic surface, can solve problems such as difficult to achieve multi-scale micro-feature wetting performance, unfavorable hydrophobic performance of microstructure, etc., and achieve structural reliability and high reuse rate. Increase the use value and application range, and the effect of fewer processes

Active Publication Date: 2013-05-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single micron structure on the template used in this method is not conducive to the sufficient improvement of hydrophobic properties, and it is difficult to realize the preparation of multi-scale micro-features and the integration of different wetting properties.

Method used

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  • Preparation method and application of super hydrophobic surface with composite microstructure
  • Preparation method and application of super hydrophobic surface with composite microstructure
  • Preparation method and application of super hydrophobic surface with composite microstructure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Figure 1a-Figure 1c The specific implementation process of the method of the present invention is shown. The equipment required for the implementation of the method of the present invention includes an injection mold A with a composite microstructure template and an injection molding machine (not shown in the figure); the injection mold A with a composite microstructure template includes a fixed mold 1, a low mesh Number through-hole plate 2, high-mesh through-hole plate 3, base layer 4 and movable mold 5, and are equipped with heating, cooling and demoulding devices (not shown in the figure); injection mold A with composite microstructure template and The injection molding machines are connected; the low-mesh through-hole plate 2, the high-mesh through-hole plate 3, the base layer 4 and the movable mold 5 are connected in sequence.

[0033]The whole process of adopting the superhydrophobic polymer product of the injection molding surface of the present invention is: ...

Embodiment 2

[0035] (1) Using a through-hole plate with a mesh number of 3000 and a through-hole plate with a mesh number of 200, the 3000-mesh through-hole plate is used as the base layer to adhere to the surface of the dynamic model cavity, and the 200-mesh through-hole plate with a smaller area is bonded to the 3000-mesh through-hole plate. Injection molds with single-scale and dual-scale microfeatures are formed on the local area of ​​the surface of the orifice plate.

[0036] (2) Heat the injection mold in step (1) to 120°C, inject the PP melt into the injection mold cavity through the injection molding machine, and apply a mold compression force of 100kN to the PP melt by unidirectionally compressing the cavity volume. The body is kept under pressure, and the PP is cooled to 80°C.

[0037] (3) Open the injection mold, and separate the molded PP product from the injection mold with a demoulding device.

[0038] Figure 2a to Figure 2e The implementation effect of the present inventi...

Embodiment 3

[0041] (1) Use a through-hole plate with a mesh number of 1800 and a through-hole plate with a mesh number of 200, use the 1800-mesh through-hole plate as the base layer to adhere to the surface of the moving model cavity, and glue the 200-mesh through-hole plate to the surface of the 1800-mesh filter screen , thus forming an injection mold with a dual-scale composite microstructure.

[0042] (2) Heat the surface of the injection mold cavity in step (1) together with the combined through-hole plate to 120°C, inject the PP melt into the injection mold through the injection molding machine, drive the screw of the injection molding machine, and apply 50MPa protection to the melt. Press the pressure and cool the PP to 80°C.

[0043] (3) Open the injection mold and separate the molded PP product from the injection mold using a demoulding system.

[0044] Figure 3a and Figure 3b The scanning electron micrographs of the surface microstructure of the prepared PP product and the w...

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Abstract

The invention relates to a preparation method of a super hydrophobic surface with a composite microstructure. The preparation method comprises the following steps of: a, manufacturing a composite microstructure moldboard with more than two scale micro features according to the wetting features required by a product surface, and fixing the composite microstructure moldboard on the surface of an injection molding die cavity; b, utilizing the injection molding machine to inject a macromolecule fusant in the injection molding die cavity, carrying out pressure maintaining on the fusant through the one-way or bi-directional compression of the volume of the die cavity or the axial movement of the screw rod of the injection molding machine, and subsequently cooling and shaping; and c, isolating a macromolecule product and an injection mold through a stripper apparatus, and obtaining the super hydrophobic surface. According to the preparation method, the composite microstructure on an accurate copying moldboard, the microstructure surface and macromolecule products with various functions are obtained, and the preparation method belongs to the technical field for preparing the hydrophobic surface.

Description

technical field [0001] The invention relates to a technology for preparing a super-hydrophobic surface, in particular to a method and application for injection-molding a super-hydrophobic surface of a polymer material by using a composite microstructure template. Background technique [0002] The wetting properties of the material surface mainly depend on the microscopic geometric structure and the chemical composition of the material. By constructing a rough structure on a hydrophobic solid surface (water contact angle greater than 90°), or modifying a low surface energy substance on a rough solid surface, the solid surface can be endowed with superhydrophobic properties (water contact angle greater than 150°). In nature, many superhydrophobic surfaces have multi-scale composite microstructures, that is, there are small-scale micro-features on the surface of large-scale micro-features, which is due to the higher mechanical stability of multi-scale composite microstructures ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00
Inventor 黄汉雄关伟盛
Owner SOUTH CHINA UNIV OF TECH
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