Anti-corrosion self-cleaning composite coating as well as preparation method and application thereof

Abstract

The invention discloses an anti-corrosion self-cleaning composite coating as well as a preparation method and application thereof. The composite coating comprises an epoxy resin layer and a polyurethane layer which are in contact with each other, an epoxy resin composition for preparing the epoxy resin layer comprises waterborne epoxy emulsion, a waterborne epoxy curing agent, filler, an aluminumcorrosion inhibitor and a coupling agent, and a polyurethane composition for preparing the polyurethane layer comprises polyurethane emulsion, a polyurethane curing agent and nano TiO2. The compositecoating combines the characteristics of chemical agent resistance and alkali resistance of epoxy resin and excellent chemical resistance, salt fog resistance, weather resistance and water resistance of the polyurethane layer, the flexibility of a coating film on the surface of a metal material can be enhanced, in addition, the aluminum corrosion inhibitor added to the epoxy resin layer can effectively inhibit corrosion of the aluminum surface, the nano TiO2 added into the polyurethane layer has a self-cleaning effect, so that the metal substrate can be prevented from being corroded by severe weather, and the stability of the composite coating in the severe weather can be enhanced.

Description

technical field [0001] The invention relates to the field of water-based coatings, in particular to a composite coating with anti-corrosion and self-cleaning functions that can be used on overhead aluminum stranded wire or other metal surfaces in harsh atmospheric environments, and the preparation method and methods of the composite coating application. Background technique [0002] Since multiple power transformations are required in the process of current transmission, the transmission of current is called power transmission and transformation. Power transmission and transformation is like a large network covering the whole country. Substations are nodes in the network, and transmission lines connect each node. Transmission lines can be divided into: steel towers, steel pipe poles, concrete poles, power cables and other forms. Because the transmission and transformation equipment is generally installed in harsh environmental conditions of industrial pollution and wind an...

AI Technical Summary

Problems solved by technology

Because the transmission and transformation equipment is generally installed in harsh environmental conditions of industrial pollution and wind and sand erosion, especially in the acid atmosphere environment, the corrosion damage to metal facilities has caused potential risks to the safety, reliability and service life of transmission and transformation equipment and transmission lines. , causing potential safety hazards in power transmission and transformation lines, pole towers, etc.

Especially for the phenomenon of strong wind dancing in the overhead wires of power transmission and transformation in Northwest China, the anti-corrosion coating on the surface of power transmission and transformation facilities is twisted and cracked due to frequent wire dancing

For example, in a 220KV substation, an accident occurred in which the main transformer failed due to corrosion, thinning and fracture of wires and wire clips in special harsh environments such as acid atmosphere, and the direct economic loss amounted to more than 3 million yuan

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