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Preparation method of metal surface superhydrophobic coating

A super-hydrophobic coating, metal surface technology, used in devices, coatings, special surfaces, etc. for coating liquids on the surface, can solve the problems of high cost, unsuitable for being widely used in daily life metal devices, etc., and achieve production equipment. The effect of simplicity, good hydrophobicity and simple preparation method

Active Publication Date: 2019-01-04
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, various rare earth metal salts are used in the process, and the cost is high. It is only suitable for extreme conditions such as steam turbines, and is not suitable for metal devices widely used in daily life.

Method used

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  • Preparation method of metal surface superhydrophobic coating

Examples

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Embodiment example

[0045] The total mass of the configuration is 500g, wherein the mass fraction of polyvinyl alcohol is 2%, the mass fraction of polyacrylic acid is 5%, the mass fraction of glyoxal is 0.35%, and the hydrophobically modified nano-silica 2% of the average particle size is 30nm. Vinyl alcohol-polyacrylic acid aqueous solution as an example.

[0046] The first step: use a beaker with a mass of m1, take 50g of 50% polyacrylic acid solution, add 350g of water to dilute, stir, add 10g of nano-silica, heat and stir to 95°C;

[0047] Step 2: Slowly add 10g of polyvinyl alcohol, add m2g of water during the process, heat and stir until completely dissolved, stop heating, and let stand to remove air bubbles;

[0048] Step 3: Add 4.4g of 40% glyoxal aqueous solution, weigh the total mass m3 including the beaker, and finally add 500-m3+m1 g water to obtain a solution with a corresponding concentration of each component.

Embodiment 1

[0050] A preparation method of a brass sheet superhydrophobic coating, the selected base material is a 2.5cm * 7.5cm * 0.2cm brass sheet, specifically comprising the following steps:

[0051] 1. Pretreatment: First, use brass sheet metal cleaning agent to ultrasonicate for 10 minutes at 35°C, then rinse the surface with ultrapure water, then immerse the brass sheet substrate in 90°C antirust solution for 45 minutes, and finally take it out , Rinse the surface with ultrapure water, and place it in a dust-free and ventilated condition to air dry naturally. The metal cleaning agent components used are: sodium tripolyphosphate (10 w / %), fatty alcohol polyoxyethylene ether (O-20) (5 w / %), potassium hydroxide (2 w / %) and deionized Water (83 w / %); the antirust solution used is potassium dichromate and chromium trioxide aqueous solution, of which potassium dichromate is 250g / L and chromium trioxide is 0.8g / L.

[0052] 2. After pretreatment, immerse the brass sheet substrate in polyvi...

Embodiment 2

[0055] A preparation method of a brass sheet superhydrophobic coating, the selected base material is a 2.5cm * 7.5cm * 0.2cm brass sheet, specifically comprising the following steps:

[0056] 1. Pretreatment: First, use brass sheet metal cleaning agent to ultrasonicate for 10 minutes at 35°C, then rinse the surface with ultrapure water, then immerse the brass sheet substrate in 90°C antirust solution for 45 minutes, and finally take it out , Rinse the surface with ultrapure water, and place it in a dust-free and ventilated condition to air dry naturally. The metal cleaning agent components used are: sodium tripolyphosphate (8 w / %), fatty alcohol polyoxyethylene ether (O-20) (3 w / %), potassium hydroxide (2 w / %) and deionized Water (87 w / %); the antirust solution used is an aqueous solution of potassium dichromate and chromium trioxide, of which potassium dichromate is 250g / L and chromium trioxide is 0.8g / L.

[0057] 2. After pretreatment, immerse the brass sheet substrate in t...

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Abstract

The invention discloses a preparation method of a metal surface superhydrophobic coating. The preparation method comprises the following steps that impurities on the metal surface are cleared by a metal cleaning agent, and then processing is conducted by anti-rust liquid; a metal substrate is immersed in a poval-polyacrylic acid aqueous solution containing nanometer silica, and therefore mass hydroxide radical is attached to the metal surface; and the processed metal substrate and a silylating reagent are positioned in the vacuum conditions, and conduct gas phase reaction to obtain the superhydrophobic surface. The preparation method is simple, required production equipment is simple, and no waste water containing fluoride is produced. The coating can be effectively attached to brass, aluminum alloy and other metal surfaces, applicability is high, the attaching performance is high, and high temperature resistance is achieved.

Description

technical field [0001] The invention belongs to the technical field of surface modification of metal materials, and more specifically relates to a method for preparing a superhydrophobic coating on a metal surface. Background technique [0002] Brass is an alloy composed of copper and zinc. Brass composed of copper and zinc is called ordinary brass. If it is composed of two or more elements, it is called special brass. Because brass has strong wear resistance, brass is often used to manufacture various metal devices, such as heat exchange heat pipes used in notebooks, connecting pipes for internal and external air conditioners, and radiators. [0003] In addition, aluminum and aluminum alloys are also common metal products in industrial production and daily life. Among them, aluminum alloy is the most widely used metal product in industry at present. There are more small metal parts such as screws, nuts and corner pieces. Made of aluminum alloy. [0004] Generally speaking...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00B05D7/14B05D3/12
CPCB05D3/12B05D5/00B05D7/14B05D2401/20B05D2502/00B05D2518/10
Inventor 曾晖李金辉林顺蛟杜建伟
Owner SUN YAT SEN UNIV
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