CN-121379279-B - Corrosion-resistant nano ceramic coating for aircraft and preparation method thereof

Abstract

The invention discloses a corrosion-resistant nano ceramic coating for an aircraft and a preparation method thereof, relates to the technical field of coatings, and belongs to the technical field of patent classification numbers C09D1/00. Firstly, hydroxylating zirconia-alumina composite nano ceramic powder and modifying the surface of a silane coupling agent, and then, copolymerizing and grafting monomers such as trifluoroethyl acrylate through free radicals to form the modified nano ceramic powder coated by fluorine polymer resin. Meanwhile, preparing a three-dimensional interpenetrating network structure matrix resin formed by copolymerizing allyl modified bisphenol A epoxy resin and acrylic polysiloxane resin and crosslinking isocyanate. And finally, compounding the modified nano ceramic powder with the cross-linked modified matrix resin and the auxiliary agent, and dispersing and defoaming to obtain the final coating. According to the invention, by constructing the synergistic effect of the inorganic ceramic core-organic fluororesin coating structure and the high-crosslinking-density resin matrix, the corrosion resistance of the coating in harsh environments such as acid, alkali, salt fog and aviation fuel oil is obviously improved, and the coating is particularly suitable for protecting the surface of an aircraft.

Inventors

• TAN MENGLING
• LIU ZHONGYU
• LIU ANMIN
• LUO LIJIAN

Assignees

• 广东省漆色彩新型材料有限公司

Dates

Publication Date

20260512

Application Date

20251205

Claims (8)

1. 1. The preparation method of the corrosion-resistant nano ceramic coating for the aircraft is characterized by comprising the following steps of: S1, adding zirconia-alumina composite nano ceramic powder into deionized water, performing ultrasonic dispersion, then adding dilute nitric acid and hydrogen peroxide, stirring for reaction, and washing and drying to obtain hydroxylated composite nano ceramic powder; s2, adding the hydroxylated composite nano ceramic powder into absolute ethyl alcohol, performing ultrasonic dispersion, adjusting pH, adding a silane coupling agent KH-560, stirring for reaction, and performing centrifugal separation, washing and drying to obtain coupling agent modified ceramic powder; S3, adding coupling agent modified ceramic powder into N, N-dimethylformamide, performing ultrasonic dispersion, adding trifluoroethyl acrylate, allyl glycidyl ether and dibenzoyl peroxide, introducing nitrogen, heating and stirring for reaction, then cooling, adding diethylenetriamine, continuously stirring for reaction, and performing centrifugal separation, washing and drying to obtain fluorine polymer resin modified nano ceramic powder; S4, adding allyl modified bisphenol A epoxy resin into a mixed solvent of N, N-dimethylformamide and ethyl acetate, stirring for dissolution, then adding a dispersing agent, a leveling agent and a defoaming agent, and stirring uniformly to obtain an epoxy resin base material; S5, mixing the epoxy resin base material with acrylic polysiloxane resin, adding dibenzoyl peroxide, introducing nitrogen, stirring for reaction, then adding isocyanate terpolymer curing agent and catalyst, and stirring for reaction to obtain cross-linked modified matrix resin; S6, mixing the cross-linked modified matrix resin, the fluorine polymer resin modified nano ceramic powder and the antioxidant, performing ultrasonic dispersion, performing high-speed dispersion, performing vacuum defoamation, adding a thickener to adjust viscosity, and filtering to obtain the corrosion-resistant nano ceramic coating for the aircraft.
2. 2. The preparation method of the corrosion-resistant nano ceramic coating for the aircraft, according to claim 1, is characterized in that in the step S2, the mass ratio of the hydroxylated composite nano ceramic powder to the silane coupling agent KH-560 is 10 (0.8-1.5).
3. 3. The preparation method of the corrosion-resistant nano ceramic coating for the aircraft, which is disclosed in claim 1, is characterized in that in the step S3, the mass ratio of trifluoroethyl acrylate to allyl glycidyl ether is 35 (2-5).
4. 4. The method for preparing the corrosion-resistant nano ceramic coating for the aircraft according to claim 1, wherein in the step S3, hydroxyethyl acrylate is further added to the N, N-dimethylformamide.
5. 5. The preparation method of the corrosion-resistant nano ceramic coating for the aircraft, which is disclosed in claim 4, is characterized in that the mass ratio of trifluoro ethyl acrylate to hydroxyethyl acrylate is 35 (3-6).
6. 6. The method for preparing the corrosion-resistant nano ceramic coating for the aircraft, which is disclosed in claim 1, is characterized in that in the step S5, the mass ratio of the allyl modified bisphenol A epoxy resin to the acrylic polysiloxane resin is 85 (30-38).
7. 7. The method for preparing the corrosion-resistant nano ceramic coating for the aircraft, according to claim 1, is characterized in that in the step S6, the mass ratio of the crosslinked modified matrix resin to the fluorine polymer resin modified nano ceramic powder is 7 (1-2).
8. 8. An aircraft corrosion resistant nanoceramic coating prepared by the method of any one of claims 1 to 7.

Description

Corrosion-resistant nano ceramic coating for aircraft and preparation method thereof Technical Field The invention relates to the technical field of paint, belongs to the patent classification number C09D1/00, and in particular relates to a corrosion-resistant nano ceramic paint for an aircraft and a preparation method thereof. Background In the field of aerospace, an aircraft needs to face complex and harsh service environments such as ocean high-salt high-humidity, high-altitude low-temperature low-pressure, acid-base medium erosion, airflow scouring and the like for a long time in the whole life cycle, and a coating is used as a first protective barrier of an aircraft body and key components, so that the structural safety, stealth stability and service life of the aircraft are directly determined by the corrosion resistance of the aircraft. With the continuous development of aviation technology, the flight speed, the endurance time and the operational radius of an airplane are continuously improved, the protection requirement on a coating is also increasingly severe, and not only is corrosion failure caused by salt mist, damp heat, chemical media and the like prevented, but also the comprehensive performances of light weight, high temperature resistance, stripping resistance and the like are also considered. However, the existing aircraft paint generally has a technical bottleneck of insufficient corrosion resistance. The traditional aircraft coating mostly adopts an organic film forming system such as epoxy resin, polyurethane and the like or a composite system added with functional fillers such as ferrite and the like, and the coating is easy to oxidize, crack, peel and the like under extreme environments, for example, the common iron-based stealth coating for carrier-based aircraft can cause exposure and rapid oxidation of internal iron elements due to surface scratches or damage in a marine high-salt and high-humidity environment to form large-area rust, so that stealth performance is weakened, flight resistance is increased, and key component faults such as an engine and the like can be caused by rust falling. Even if the short-term corrosion resistance of part of the coating is improved by optimizing the formula, the stability and the comprehensive performance in long-term service are difficult to balance, for example, part of the thermal barrier coating has the defects of high porosity and insufficient compactness, can not effectively block the penetration of corrosive media, so that the matrix material is failed too early, and some high-performance coatings depend on complex preparation processes (such as electron beam physical vapor deposition), so that the problems of high cost and difficulty in large-scale application exist. Poor corrosion resistance of the coating has become a key factor in limiting the improvement of aircraft reliability and the reduction of maintenance costs. The data show that the maintenance cost of the aviation field caused by corrosion of the coating reaches billions of dollars each year, and the problems of coating falling off, structural strength reduction and the like caused by corrosion seriously threaten flight safety and shorten the service cycle of an airplane. Although attempts have been made in the prior art to introduce nanoceramic materials into aviation coatings to improve performance, the prior art still faces challenges such as uneven dispersion, insufficient bonding strength, complex process, and the like in the preparation process, and fails to form a mature aircraft coating product which combines excellent corrosion resistance with practical requirements. Therefore, the nano ceramic coating for the aircraft, which has excellent corrosion resistance and balanced comprehensive performance, is developed, and has important practical significance and application value. Disclosure of Invention The invention aims to provide a corrosion-resistant nano ceramic coating for an aircraft and a preparation method thereof, which are used for solving the technical problem that the corrosion resistance of the aircraft coating provided by the background art is poor. In order to achieve the above purpose, the present invention provides the following technical solutions: The preparation method of the corrosion-resistant nano ceramic coating for the aircraft comprises the following steps: S1, adding zirconia-alumina composite nano ceramic powder into deionized water, performing ultrasonic dispersion, then adding dilute nitric acid and hydrogen peroxide, stirring for reaction, and washing and drying to obtain hydroxylated composite nano ceramic powder; s2, adding the hydroxylated composite nano ceramic powder into absolute ethyl alcohol, performing ultrasonic dispersion, adjusting pH, adding a silane coupling agent KH-560, stirring for reaction, and performing centrifugal separation, washing and drying to obtain coupling agent modified ceramic powder; S3, adding coupling age