Preparation method of self-cleaning anticorrosion sol for metal substrate

Abstract

The invention relates to the preparation technology of a sol, and aims at providing a preparation method of a self-cleaning anticorrosion sol for a metal substrate. The method comprises the following steps: feeding tetramethyl orthosilicate or tetraethoxysilane into a saturated alcohol solvent of ammonia gas under an agitating condition; then feeding water to react; performing rotary evaporation to remove some alcohol solvent to obtain high-solid-content particular colloidal silica sol; further feeding Al(OH)3 sol; ageing; further feeding nanometer titanium dioxide powder and glass beads; agitating; filtering the sol; further feeding a catalyst for regulating the pH; dropwise adding organo-siloxane to react to obtain the self-cleaning anticorrosion sol. According to the method, anatase titanium dioxide powder is introduced on the basis of Al(OH3) sol in-situ coated and modified coated silica sol and is grinded and uniformly dispersed into the Al(OH3) sol in-situ coated and modified coated silica sol, and therefore, the anatase titanium dioxide powder can be uniformly dispersed in the prepared coating to effectively improve the self-cleaning performance of the coating on the substrate while the corrosion resistance is ensured.

Description

technical field

[0001] The invention relates to a sol preparation technology, in particular to a method for preparing a self-cleaning anticorrosion sol used for metal substrates. Background technique

[0002] Inorganic ceramic coating is a new type of organic-inorganic composite coating. The organic-inorganic nano-composite coating (inorganic ceramic film) based on sol-gel technology introduces organic groups so that the coating not only has the flexibility and Inorganic coatings have corrosion resistance properties and are easy to construct. A coating with high hardness, corrosion resistance, wear resistance, heat resistance, non-combustibility, low pollution, and ceramic texture can be obtained by curing at low temperature (100-250 ° C), and becomes a metal coating. An environmentally friendly and clean substitute in the field of coating anti-corrosion, it can be widely used in the field of atmospheric anti-corrosion of aluminum, iron and other metals or alloys as a pretre...

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