Coating composition for rapidly repairing damaged skin coat of spacecraft

Abstract

The invention relates to a coating composition for rapidly repairing a damaged skin coat of a spacecraft. The coating composition comprises a component A and a component B, wherein the component A comprises the following components in percentages by mass: 15%-25% of medium-high molecular weight epoxy resin, 2%-12% of modified resin, 15%-30% of conventional-type pigment and filler, 15%-30% of environment-friendly anti-corrosion paint, 0.5%-1% of additive and the balance of the solvent; the component B comprises the following components in percentages by mass: 60%-90% of epoxy-amine adduct, 10%-40% of epoxy-polyaminoalkoxysilane adduct, and the sum of epoxy-amine adduct and epoxy-polyaminoalkoxysilane adduct is 100%; before construction, the component A and the component B are evenly mixed at a mass ratio of (4 to 6): 1. The coating composition has excellent comprehensive performance which is comparable to that of the novel coating system, the repair time is shortened, the repair efficiency is increased, the wastes of energy and resources are decreased and the labor intensity of workers is reduced.

Description

technical field [0001] The invention relates to a coating composition for quickly repairing damaged skin coatings of aircraft. Background technique [0002] Due to the harsh operating environment of aircraft, its skin coating is prone to damage or even peeling off during operation. In order to prevent the exposed skin material from being corroded and affect the life and flight safety of the aircraft, it is necessary to repair the damaged coating. The repair process of the damaged aircraft skin coating includes four steps: ①partial paint removal or slight grinding, ②surface protection treatment, ③spraying protective primer and ④spraying protective topcoat, among which, step ② is the most important step in the repairing process. The quality of the key process directly affects the performance of the whole skin coating system after repair. At present, the methods commonly used in step ② include chemical oxidation surface protection treatment and phosphating primer surface prot...

AI Technical Summary

Problems solved by technology

However, the above two surface protection treatment methods have problems such as serious waste of energy and resources, complicated process, high labor intensity of workers, serious environmental pollution, and long repair period to varying degrees.

For example, the disadvantages of the chemical oxidation surface protection treatment method are: ①For the oxidized skin material, the treatment effect is relatively poor; ②The primer must be painted within 24 hours after treatment, which limits the freedom of construction; Rinse with a large amount of deionized water. The rinsed water contains chromium ions, which is likely to cause environmental pollution; ④ After surface protection treatment, the oxide film formed is non-conductive and cannot be welded by the new bonding spot welding process; and the phosphating primer surface Protective treatment has high requirements on construction conditions, and a little carelessness will cause serious consequences of large-scale paint loss

In order to ensure the performance of the repair coating system, after the above two surface protection treatments are completed, it is still necessary to spray a protective primer on the surface of the treatment layer. The process is complicated and the repair cycle is long.

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