Preparation method of organic-inorganic composite sol for metal aluminum sheet surface corrosion prevention

A composite sol and metal aluminum technology, applied in the direction of anti-corrosion coatings, coatings, etc., can solve the problems of further improvement in adhesion and hardness, and achieve the effects of improving corrosion resistance, increasing adhesion, and enhancing coating hardness

Inactive Publication Date: 2015-04-29
ZIGONG INNOVATION CENT OF ZHEJIANG UNIV
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Problems solved by technology

The current inorganic ceramic coatings generally use SiO 2 The sol is obtained by hydrolytic polymerization with organosiloxane, but on the surface of a specific metal aluminum plate, the adhesion and hardness of the coating need to be further improved

Method used

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  • Preparation method of organic-inorganic composite sol for metal aluminum sheet surface corrosion prevention

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Embodiment Construction

[0014] The present invention is further described by examples below.

[0015] The preparation method of the organic-inorganic composite sol for anticorrosion on the surface of metal aluminum plate in the present invention includes the following steps:

[0016] (1) Under the stirring condition of 300r / min, add one or a mixture of methyl orthosilicate and ethyl orthosilicate to the saturated alcohol solvent of ammonia gas at a mass ratio of 1:1~5 ; Then add water to ensure that the molar ratio of water to silicon is 6-10:1; after reacting at 60°C for 8 hours, heating at 90°C to reflux for 8 hours to remove ammonia, and obtaining particle-type nano silica sol by rotary evaporation;

[0017] (2) Add Al(OH) to the nano silica sol at a stirring rate of 800r / min 3 Sol, keep the molar ratio of Si:Al at 5~1:1; after aging at 50℃ for 24 hours, Al(OH) is obtained 3 In-situ modified coated composite silica sol;

[0018] (3) Under the stirring condition of 300r / min, add a catalyst to the composite...

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Abstract

The invention relates to preparation of a sol, and aims to provide a preparation method of an organic-inorganic composite sol for metal aluminum sheet surface corrosion prevention. The method comprises the following steps: adding tetramethyl orthosilicate or ethyl orthosilicate into a saturated alcohol solvent of ammonia gas, adding water, reacting, heating under reflux to remove ammonia, and carrying out rotary evaporation to obtain a nano silicon dioxide sol; adding the nano silicon dioxide sol into a Al(OH)3 sol, and aging; adding a catalyst while stirring and keeping the pH value at 1-5, adding an acetylacetonate chelator, and continuing stirring; and dropwisely adding an organosiloxane-titanate mixture, and reacting to obtain the sol. The method greatly increases the adhesive force between the coating and metal aluminum sheet by 1-3 levels on the basis of the traditional silicon coating. The high-hardness Al(OH)3 is coated on the nano silicon dioxide particles to further enhance the coating hardness by 2H or so on the basis of the traditional silicon coating, and the corrosion resistance in a neutral salt fog resistance experiment is enhanced by 2-3 times.

Description

Technical field [0001] The invention relates to the preparation of a sol, in particular to an organic-inorganic composite sol used for anticorrosion on the surface of a metal aluminum plate and a preparation method thereof. Background technique [0002] Inorganic ceramic coating is a new type of organic-inorganic composite coating. The organic-inorganic nanocomposite coating based on sol-gel technology (inorganic ceramic film) introduces organic groups to make the coating not only have the flexibility and flexibility of organic coating Inorganic coating has corrosion resistance characteristics and is convenient for construction. It can be cured at low temperature (100~250℃) to obtain a coating with high hardness, corrosion resistance, wear resistance, heat resistance, non-combustibility, low pollution, and ceramic texture. An environmentally friendly and clean alternative in the field of coating anti-corrosion, it can be widely used in the field of atmospheric anti-corrosion of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/08
Inventor 阙永生吴春春杨辉申乾宏张玲洁汪海风
Owner ZIGONG INNOVATION CENT OF ZHEJIANG UNIV
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