Self-cleaning coating used for building curtain wall aluminum veneer and preparation method thereof

Abstract

The invention relates to self-cleaning coating used for a building curtain wall aluminum veneer and a preparation method thereof. The coating is divided into a first component, a second component and a third component, wherein the first component is coated on the surface of the aluminum veneer for forming a bottom coating; the second component is coated on the surface of the bottom coating to form a middle coating; the third component is coated on the surface of the middle coating to form a top coating; in the first component, polyester resin and amino resin serve as film forming substance, and silicon-titanium or silicon-zirconium coupling agent is used for greatly improving adhesive force on the aluminum veneer by the bottom coating; in the second component, fluoralkene alkyl vinyl ether or ester copolymer (FEVE) fluorocarbon resin serves as the film forming substance, and therefore the coating shows excellent durability, weather fastness and corrosion resistance; and in the third component, the FEVE fluorocarbon resin and organic silicon resin serve as the film forming substance, the coating surface tension is lowered by a fluorine and silicone interpenetrating network, the hydrophobicity and the contamination resistance of the coating surface are improved, and dirt on the coating surface is easy to clean. In addition, the preparation and construction processes of a coatingsystem disclosed by the invention are simple, and the self-cleaning coating is especially suitable for protecting an aluminum sheet curtain wall.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a self-cleaning coating for aluminum veneers of building curtain walls and a preparation method thereof. Background technique [0002] As time goes by, the surface coating of the building curtain wall will lose light, discolor, pulverize and fall off in the atmospheric environment, resulting in the exposure of the curtain wall base material. Corrosion due to electrochemical reaction, performance degradation, or even destruction, so the anti-corrosion technology of curtain wall base material plays an extremely important role in the safety performance and durability of curtain wall base material. In addition, acid rain and various dust and dirt in the atmospheric environment are easy to adhere to the surface of the curtain wall. Acid rain is corrosive to the surface coating of the curtain wall. If the substance penetrates into the coating film, the stain cannot be removed, and spots appear...

AI Technical Summary

Problems solved by technology

[0003] Traditional self-cleaning coatings for building curtain wall aluminum veneers have many problems, such as: (1) The coating usually contains strontium chromate, which causes heavy metal pollution; (2) The coating has poor adhesion to the aluminum veneer; (3) The durability of the coating is limited, generally within 5 years; (4) The acid resistance and stain resistance of the coating are not high, and frequent cleaning with a strong cleaning agent is required (often working at heights) , there is a certain risk); (5) The cost of conventionally used PVDF (polyvinylidene fluoride) fluorocarbon self-cleaning coatings is high, it is difficult to change the color, and it must be cured at high temperature, which is troublesome to operate and consumes energy

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