A kind of topcoat for building curtain wall aluminum veneer and preparation method thereof

Abstract

The invention relates to a finish for a building curtain wall aluminum veneer, and a preparation method thereof. The finish comprises 60 to 70% of FEVE fluorocarbon resin, 5 to 10% of an organic silicon resin, 0.05 to 0.1% of an acrylic acid levelling agent, 0.1 to 0.3% of an organosilicon levelling agent, 0.3 to 0.8% of benzotriazole ultraviolet absorbent, 0.3 to 0.8% of hindered amine light stabilizer, 0.1 to 0.3% of an organotin catalyst, 10 to 15% of butyl acetate, 10 to 15% of dimethylbenzene and 9 to 13% of an aliphatic isocyanate curing agent, wherein the aliphatic isocyanate curing agent needs to be individually packaged and stored and is added into a formula prior to construction for use. The FEVE fluorocarbon resin and the organic silicon resin are utilized as film-forming substances of the finish and the finish can be cured at normal temperature, and thus energy and labor are saved. Through a fluorine-silicon interpenetrating network structure, film surface tension is reduced and a water contact angle is reduced, and thus film anti-contamination properties are improved greatly. Through introduction of silicon atoms, film toughness is improved, and thus a film surface isnot easy to craze and temperature tolerance and endurance are further improved. In addition, the finish has the advantages of simple preparation method and low cost.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a topcoat for building curtain wall aluminum veneers 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 on the surfac...

AI Technical Summary

Problems solved by technology

The traditional topcoat for aluminum veneer of building curtain wall has the following problems: the temperature resistance of the coating is not good, it is easy to crack and peel when the temperature difference changes greatly, and the durability is limited, generally within 5 years; the acid resistance and The stain resistance is not high, and frequent cleaning with a strong cleaning agent is required (often working at heights, which is dangerous); the commonly used PVDF (polyvinylidene fluoride) fluorocarbon self-cleaning coating is expensive, difficult to change color, and requires High temperature baking and curing, troublesome operation and energy consumption

Images