Ultra hydrophobic surface preparation method

A super-hydrophobic surface, low surface energy technology, applied in the direction of coating liquid on the surface of the device, special surface, pretreatment surface, etc., can solve the problems of non-self-healing, complex, super-hydrophobic surface easy to damage, etc. Wide adaptability, simple process and long service life

Inactive Publication Date: 2009-04-29
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the current various technologies are still difficult to solve the preparation of large-area hydrophobic surfaces and coatings. Many technologies still have problems such as the need to use complex equipment or high-temperature calcinations, which limits the types and quantities of super-hydrophobic surfaces or coating products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] The average particle size of the activated carbon particles is 10 μm, the average pore size is 20 nm, and the porosity is 40%. It is activated by high temperature drying method and dried at 300°C for 2 hours. Then, 50 grams of organic silicon, 20 grams of activated carbon particles and 3 grams of coupling agent are used to mix until homogeneous. A coating is formed on the surface of the aluminum plate by brushing, and placed in dry air for 5 hours. The thickness of the obtained coating is 50 μm, and the static contact angle measured with the contact angle meter OCA20 is 163°.

Example Embodiment

[0021] Example 2

[0022] Use commercially available activated alumina with an average particle size of 8 μm, an average pore size of 15 nm, and a porosity of 36%. Ultrasonic cleaning in acetone for 5 minutes, and set aside after drying. Weigh 50 grams of tetrafluoroethylene, 15 grams of activated alumina, and 2.5 grams of coupling agent, and mix them with mechanical stirring until uniform. Spraying on the aluminum plate with a spray gun, and drying the coating with dry hot air for 10 minutes. The thickness of the coating obtained was 30 μm and the contact angle was 168°.

Example Embodiment

[0023] Example 3

[0024] The commercially available attapulgite was selected, and a 5mol / L hydrochloric acid aqueous solution was used as the activation modifier for surface modification. The ratio of the attapulgite and the hydrochloric acid solution is 1:20, and the mixture is uniformly mixed. After 30 minutes of ultrasonic stirring treatment, it is precipitated, filtered and dried for use. The surface-modified attapulgite particles have an average particle size of 0.4μm. Weigh 50 grams of tetrafluoroethylene, 10 grams of surface-modified attapulgite, and 1.5 grams of coupling agent, and mix them with mechanical stirring until uniform. A coating is formed on the surface of the aluminum plate by brushing and placed in dry air for 6 hours. The obtained coating has a thickness of 20 μm and a contact angle of 156°.

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Abstract

The invention relates to a preparation method of a superhydrophobic surface, in particular to a method for preparing the superhydrophobic surface by compounding micron or sub-micron particles with nanometer pores or nanometer decorative surfaces and a low surface energy material. The method concretely comprises the following steps: the superhydrophobic surface is prepared by compounding the micron or sub-micron particles with nano-sized pores or surfaces decorated by nanometer and the low surface energy material; firstly activation is carried out to the particle surfaces by the existing mature surface activation technology so as to remove passivation membranes on the particle surfaces; then the low surface energy material, the micron or sub-micron particles after surface activation, a coupling agent and the like are evenly mixed, and the mixture is sprayed or painted on the surface to be processed according to needs; finally the hydrophobic surface is obtained after natural drying or being dried at a reasonable temperature. The method can solve the problem that the surface of a special shape is difficult to process in the prior art; the process is simple, thus being suitable for mass application; and the prepared hydrophobic surface has long service life.

Description

technical field [0001] The invention relates to a method for preparing a super-hydrophobic surface, in particular, the invention relates to a method for preparing a super-hydrophobic surface by combining micron or submicron particles with nanopores or nano-modified surfaces with low surface energy materials. Background technique [0002] The basic theoretical research on superhydrophobic membranes began in the 1950s. Generally, the contact angle with water greater than 150° is called superhydrophobic film. The contact angle is determined as the angle between the tangent to the contour at the end of the beading curve at the liquid-solid-gas junction and the solid surface. Due to the unique surface characteristics of the super-hydrophobic film, it has broad application prospects in national defense, daily life and many industrial fields. For example, super-hydrophobic technology is used on outdoor antennas to prevent snow accumulation and ensure communication quality; it is u...

Claims

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Application Information

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IPC IPC(8): B05D5/00B05D7/24B05D3/00C09D127/12C09D183/04
Inventor 陈刚赵玉涛
Owner JIANGSU UNIV
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