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Preparation method of rare earth/silane doped composite superhydrophobic functional coating

A super-hydrophobic, silane hydrolyzate technology, used in coatings, metal material coating processes, anti-corrosion coatings, etc., can solve problems such as unfavorable environmental protection and personal safety, poor corrosion resistance, complex processes, etc., to improve self-cleaning performance, Improve mechanical stability and improve the effect of bonding force

Active Publication Date: 2019-04-05
TIANJIN GONGDA GALVANIZING EQUIP CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor corrosion resistance of the galvanized layer in harsh environments, complex process, high cost, unfavorable environmental protection and personal safety in the current treatment process, and provides a rare earth / silane doped composite super Preparation method of hydrophobic functional coating to further improve corrosion resistance of galvanized steel and make its surface multifunctional

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  • Preparation method of rare earth/silane doped composite superhydrophobic functional coating

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preparation example Construction

[0024] The invention is a preparation method of a rare earth / silane doped composite superhydrophobic functional coating, comprising the following steps:

[0025] (1) Preparation of silane hydrolyzate: with silane coupling agent, deionized water, organic solvent, prepare silane solution by silane coupling agent: deionized water: organic solvent=5:5:90 (volume ratio), apply magnetic stirring 15min~30min, put it at room temperature and carry out hydrolysis for 6~24h until the silane solution becomes clear, then use 0.05~1mol / L acetic acid solution or 0.05~1mol / L ammonia solution to adjust the pH to 4~5 to obtain silane Hydrolyzate;

[0026] (2) Preparation of rare earth-doped mixed fatty acid solution: prepare long-chain fatty acid ethanol solution with a concentration of 0.02mol / L~0.1mol / L for later use; dissolve 0.2~0.4 parts of silver nitrate and 0.43~2.17 parts of rare earth salt in 1 ~5 parts of dilute nitric acid aqueous solution, add dropwise into 50 parts of long-chain f...

Embodiment 1

[0037] Vinyltrimethoxysilane, deionized water, absolute ethanol, according to silane coupling agent: deionized water: absolute ethanol = 5:5:90 (volume ratio) to prepare 50ml of silane solution, apply magnetic stirring for 15min, set Carry out hydrolysis at room temperature for 12 hours until the silane solution becomes clear, then adjust the pH to 4-5 with 1mol / L acetic acid solution, and take 50ml for later use. Dissolve 0.24g of silver nitrate and 0.5g of cerium nitrate in 3ml of dilute nitric acid aqueous solution, add dropwise to 50ml of stearic acid-ethanol solution with a concentration of 0.05mol / L under the action of magnetic stirring, and continue stirring for 15min until the solution becomes clear . Then, it was fully mixed with 50ml of silane hydrolyzate at a volume ratio of 1:1, and stirred evenly to obtain a composite deposition solution.

[0038] Clean the galvanized steel sheet with a degreasing agent and deionized water, immerse it in the above composite depos...

Embodiment 2

[0041] With γ-aminopropyltriethoxysilane, deionized water, absolute ethanol, prepare 50ml silane solution according to silane coupling agent: deionized water: absolute ethanol=5:5:90 (volume ratio), apply magnetic force Stir for 15 minutes, place at room temperature and carry out hydrolysis for 12 hours until the silane solution becomes clear, then use 1mol / L acetic acid solution to adjust the pH to 4-5, and take 50ml for later use. Dissolve 0.2g of silver nitrate and 0.6g of lanthanum nitrate in 5ml of dilute nitric acid aqueous solution, add dropwise to 50ml of 0.02mol / L myristic acid-ethanol solution under magnetic stirring, and continue stirring for 15min until the solution becomes clear. Then, it was fully mixed with 50ml of silane hydrolyzate at a volume ratio of 1:1, and stirred evenly to obtain a composite deposition solution.

[0042] Clean the galvanized steel sheet with a degreasing agent and deionized water, immerse it in the above composite deposition solution for...

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Abstract

The invention discloses a preparation method of a rare earth / silane doped composite superhydrophobic functional coating. The preparation method includes immersing a clean galvanized matrix in a mixedtreatment solution containing inorganic rare earth salt, silver nitrate, silane coupling agents and long-chain fatty acid for 1-30 minutes, forming a bronze composite coating film on the surface of the galvanized matrix, slowly taking out the galvanized matrix and curing the same into a film at the temperature of 80-150 DEG C for 5-30 minutes. The composite coating film prepared by a simple one-step dip coating technique has the properties of super hydrophobicity, self-cleaning, anti-icing and the like, integrates the protective properties of rare earth conversion films / silane films / superhydrophobic films, and has excellent corrosion prevention capability for galvanized steel, thereby being expected to solve the problems that current chromium-containing passivation harms personal safety and pollutes the environment, other non-chromium passivation has poor protection performance and the like; the preparation method has a simple process and a low cost, and is green, environmentally friendly, and easy to industrialize.

Description

technical field [0001] The invention belongs to the technical field of metal substrate surface functionalization and anti-corrosion treatment technology, and in particular relates to a preparation method of a rare earth / silane doped composite super-hydrophobic functional coating. Background technique [0002] The harm caused by metal corrosion is serious and common, and the corrosion of metals or alloys is still the focus of researchers. Galvanizing on the surface of steel is one of the commonly used steel anticorrosion technologies in the world. It can provide both physical barrier protection and sacrificial anode protection for the steel substrate. However, for steel structural parts that have been served in harsh environments such as high temperature and high humidity, industrial atmosphere or marine atmosphere for a long time, it is difficult to provide long-term and effective protection for steel even with galvanized anti-corrosion. Therefore, it is necessary to do fur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/07C09D183/08C09D183/04C09D5/08C09D7/61C09D7/63C23C22/53
CPCC09D5/08C09D7/61C09D7/63C09D183/04C09D183/08C23C22/53C23C2222/20C08K3/28C08K5/09
Inventor 李冲冲范永哲曹晓明赵雪马瑞娜杜安
Owner TIANJIN GONGDA GALVANIZING EQUIP CO LTD
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