An antistatic anticorrosion coating material for the surface of an integrated fuel tank of an aerial vehicle and a preparation method thereof

Abstract

This invention discloses an antistatic and anti-corrosion coating material for the surface of integrated fuel tanks in aircraft and its preparation method. The antistatic and anti-corrosion coating material comprises the following components in parts by weight: 20-50 parts pigments and fillers, 30-70 parts epoxy resin, 5-20 parts conductive fillers, 0.5-1 parts active polymer dispersant, 1-2 parts leveling agent, 0.5-2.5 parts silane coupling agent, 20-50 parts curing agent, and 50-100 parts mixed solvent. Compared to traditional antistatic coatings, this antistatic and anti-corrosion coating material for integrated fuel tanks in aircraft possesses better conductivity without reducing the anti-corrosion performance of the coating film. It is suitable for the surface of integrated fuel tanks in aircraft, maintaining good corrosion resistance and effectively dissipating static charge, providing an innovative integrated antistatic and anti-corrosion solution for aircraft fuel tanks.

Description

Technical Field

[0001] This invention relates to the field of aviation coatings, and in particular to an antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft and its preparation method. Background Technology

[0002] Aircraft integral fuel tanks are exposed to complex environments of aviation kerosene, hydraulic oil, salt spray, and drastic temperature and humidity fluctuations for extended periods. This makes them prone to static electricity buildup and electrochemical corrosion. Therefore, composite coatings that combine antistatic and long-term corrosion protection are typically used to achieve effective surface protection for aircraft integral fuel tanks. Antistatic properties are enhanced by adding novel conductive fillers and nanomaterials, while the anti-corrosion components and film-forming process of the coating are optimized to strengthen its protective capabilities. Consequently, the composition is usually complex, and different components may interact, producing side effects or incompatibilities. For example, antistatic agents and corrosion inhibitors may interfere with each other, reducing their effectiveness. In addition, current antistatic coatings mainly construct conductive networks by adding conductive fillers. Traditional conductive materials include carbon-based materials (graphite, carbon nanotubes), metal powders (silver, copper), and metal oxides (zinc oxide, tin oxide), but all of them have significant defects. For example, the high addition amount of carbon-based materials leads to poor coating density, thereby accelerating the penetration of media and causing corrosion defects; metal powders are prone to oxidation and failure in humid and hot environments, and galvanic corrosion causes the matrix to dissolve; while metal oxides have problems such as insufficient conductivity and easy dissolution and deactivation in acidic environments. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides an antistatic and anti-corrosion coating material and its preparation method for the surface of an integrated fuel tank in aircraft. This invention promotes the natural dissipation of static charges on the surface of the integrated fuel tank and provides long-lasting anti-corrosion protection.

[0004] In a first aspect, the present invention provides an antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft, which is achieved by the following technical solution.

[0005] An antistatic and anti-corrosion coating material for the surface of an integrated fuel tank for aircraft comprises the following components in parts by weight: 20-50 parts pigments and fillers, 30-70 parts epoxy resin, 5-20 parts conductive fillers, 0.5-1 part active polymer dispersant, 1-2 parts leveling agent, 0.5-2.5 parts silane coupling agent, 20-50 parts curing agent, and 50-100 parts mixed solvent.

[0006] Furthermore, the pigments and fillers include pigments and anti-corrosion fillers, with a mass ratio of pigment to anti-corrosion filler of 1:(0.2~0.5); the pigments are chromate system pigments, including strontium chrome yellow and zinc chrome yellow, with a mass ratio of strontium chrome yellow and zinc chrome yellow of 1:(0.5~1.5); the anti-corrosion filler is zinc phosphate.

[0007] Furthermore, the epoxy resin is a mixture of flexible epoxy resin, phenolic epoxy resin and bisphenol A type epoxy resin, with a mass ratio of 1:(0.5~1.5):(1.5~2.5).

[0008] Furthermore, the conductive filler is potassium titanate whiskers.

[0009] Furthermore, the active polymer dispersant is selected from BYK161, BYK160, and Solsperse™ 32500.

[0010] Furthermore, the leveling agent is selected from one or more of AFCONA 7371, BYK-331 and BYK-333.

[0011] Furthermore, the silane coupling agent is selected from one or more of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane and γ-aminopropyltriethoxysilane.

[0012] Furthermore, the curing agent is selected from one or more of silane-modified alicyclic amine curing agents and silane-modified polyamide curing agents.

[0013] Further, the mixed solvent is a mixture of cyclohexanone, methyl isobutyl ketone, xylene, and n-butanol in a mass ratio of 1:(0.5~1):(1.5~2):(1~1.5). Preferably, the mass ratio of cyclohexanone, methyl isobutyl ketone, xylene, and n-butanol is 1:1:1:1.

[0014] Secondly, the present invention provides a method for preparing an antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft, which is achieved by the following technical solution.

[0015] A method for preparing an antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft, comprising the following steps: S1. Take 50% of the total mass of the mixed solvent and disperse the active polymer dispersant, leveling agent and silane coupling agent in it to obtain a mixed solution; S2. Add epoxy resin and pigments and fillers to the mixed solution obtained in step S1 in sequence, grind and mix well to obtain a mixed slurry; S3. Disperse the conductive filler in the mixed slurry obtained in step S2 to obtain the mixed slurry; S4. Add the curing agent and the remaining mixed solvent to the mixed slurry obtained in step S3, stir, and obtain the finished antistatic and anticorrosive coating.

[0016] This application has the following beneficial effects: The antistatic and anti-corrosion coating material of this invention has low viscosity, fast surface drying speed, and good compatibility with various substrates such as sealants for integral fuel tanks and aluminum alloys. While promoting the natural discharge and dissipation of static charge on the surface of the integral fuel tank of aircraft, it also has a long-term anti-corrosion function, which can protect the safety of aircraft fuel tanks in harsh environments such as humid heat and salt spray.

[0017] Specifically, this is reflected in: 1. The conductive filler used in the preparation of the antistatic and anticorrosive coating in this invention is potassium titanate whiskers. Potassium titanate whiskers are a material with a unique needle-like fibrous structure and a high aspect ratio. This unique fibrous structure allows them to overlap in the coating, constructing efficient electron transport channels, thereby achieving rapid and stable electrostatic discharge. During the preparation of the antistatic and anticorrosive coating, potassium titanate whiskers can be easily mixed with commonly used aerospace coating resins such as epoxy resin and polyurethane to form a uniform and stable coating system. Furthermore, they maintain stable conductivity under the influence of aviation kerosene, various aviation hydraulic oils, and common acids, alkalis, and salts. Compared to some other conductive fillers, potassium titanate whiskers do not react with these chemicals, thus avoiding a decrease in conductivity or coating corrosion failure. This results in a longer service life in the complex chemical environment of aircraft fuel tanks, continuously providing reliable antistatic protection for the tanks. The antistatic and anticorrosive coating obtained by this invention can be applied to a variety of substrates and operate stably in different complex environments. Compared with traditional antistatic coatings, it has better conductivity without reducing the anticorrosive performance of the paint film. It is suitable for the surface of aircraft fuel tanks, maintaining its good corrosion resistance and effectively dissipating static charge.

[0018] 2. The resin used to prepare the antistatic and anti-corrosion coating in this invention is a mixture of flexible epoxy resin, phenolic epoxy resin, and bisphenol A type epoxy resin. It possesses high strength, high toughness, heat resistance, and chemical corrosion resistance, meeting the requirements for use in aircraft fuel tanks under various harsh environments. In addition, the mixed epoxy resin has good flowability and processability, making it easy to coat onto the complex structure of the inner wall of the fuel tank, ensuring the uniformity and integrity of the coating. The curing agent and curing conditions can be adjusted according to specific needs to adapt to different construction environments and process requirements.

[0019] 3. The pigments used in the preparation of the antistatic and anticorrosive coating of this invention are chromate system pigments. After contact with the metal surface, the chromate ions can react chemically with the metal to form a dense passivation film on the metal surface, which effectively prevents oxygen, moisture and corrosive media from contacting the metal, thereby playing a good role in rust prevention. It can be well compatible with a variety of coating base materials, has good hardness and wear resistance, and the pigments used have relatively low toxicity among chromate pigment systems.

[0020] 4. The curing agent used in the preparation of the antistatic and anticorrosive coating of this invention is a silane-modified amine curing agent, which enhances the interfacial bonding and overall performance of the anticorrosive coating through chemical bonding. On the one hand, the amine group and the epoxy group undergo a nucleophilic addition reaction to form a stable CN covalent bond, constructing a three-dimensional cross-linked network; on the other hand, the alkoxysilane at the end of the curing agent, after hydrolysis, interacts with the hydroxyl groups on the surface of the metal substrate and the polar groups of the resin to achieve chemical bridging and improve adhesion. In terms of corrosion protection, the silane segments promote the formation of a high cross-linking density structure in the resin, reduce free volume, block water and oxygen penetration, and passivate the metal surface, significantly reducing the self-corrosion current density of the oil tank. Facing complex environments, the hydrophobic silane chain reduces water absorption, and the high bond energy Si-O bond buffers thermal stress, stably resisting chemical media erosion. In addition, it works synergistically with fillers to improve filler dispersibility, optimize the conductive network, further reduce the coating resistivity, and comprehensively improve the overall performance of the antistatic and anticorrosive coating.

[0021] 5. The dispersant used in the preparation of the antistatic and anticorrosive coating of this invention is one of BYK161, BYK160, and Solsperse™ 32500. All of these have good dispersibility, can disperse solid powder particles in the mobile phase, prevent solid powder particles from agglomerating, utilize steric hindrance to keep pigment particles in a dispersed state, extend the shelf life of the coating, and ensure that it maintains good performance during use. Attached Figure Description

[0022] Figure 1 This is a fiber structure diagram of potassium titanate whiskers according to the present invention. Detailed Implementation

[0023] The present patent application will be further described below with reference to the embodiments. Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods. Unless otherwise specified, the materials used in the preparation process in the following embodiments have not undergone further processing and have been commercially available.

[0024] The potassium titanate whiskers used in the following embodiments of the present invention were purchased from TISMO D-20 of Otsuka Chemical.

[0025] The flexible epoxy resin used in the following embodiments of the present invention was purchased from Guodu Chemical's KD-7400.

[0026] The phenolic epoxy resin used in the following embodiments of the present invention was purchased from Shandong Shengquan New Material Co., Ltd. as SQPN-638.

[0027] The bisphenol A type epoxy resin used in the following embodiments of the present invention was purchased from Jiangsu Sanmu Group Co., Ltd. as SM-6101.

[0028] The chromate system pigments used in the following embodiments of the present invention were purchased from Camel Pigment (Suzhou) Co., Ltd., namely 801 Strontium Chromium Yellow and 109 Zinc Chromium Yellow.

[0029] The silane-modified alicyclic amine curing agent used in the following embodiments of the present invention was prepared by adding 1.0% silane coupling agent to the Aradur® 2964 modified alicyclic amine curing agent purchased from Huntsman.

[0030] The silane-modified polyamide curing agent used in the following embodiments of the present invention was obtained by adding 1.0% silane coupling agent to the 3500S modified polyamide curing agent purchased from Jiangsu Sanmu Group Co., Ltd. Example 1

[0031] A method for preparing an antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft includes the following steps: 0.8 g of active polymer dispersant (BYK161), 1.5 g of leveling agent (AFCONA 7371), and 1.5 g of silane coupling agent (γ-(2,3-epoxypropoxy)propyltrimethoxysilane) were added to 30 g of mixed solvent (cyclohexanone, methyl isobutyl ketone, xylene, and n-butanol in a mass ratio of 1:1:1:1). The mixture was dispersed at 1000 rpm for 3 min using a high-speed disperser to obtain a mixed solution.

[0032] 30 g of mixed epoxy resin (the mass ratio of flexible epoxy resin, phenolic epoxy resin and bisphenol A type epoxy resin is 1:1:1.5) and 20 g of pigments and fillers (10 g of strontium chrome yellow, 5 g of zinc chrome yellow and 5 g of zinc phosphate) were slowly added to the above mixed solution and then ground and dispersed using a sand mill at 2000 rpm for 60 min to obtain a mixed slurry.

[0033] Add 10 g of conductive filler to the above mixed slurry and disperse it for 10 min at 1500 rpm using a high-speed disperser to ensure uniform mixing.

[0034] Finally, 25 g of silane-modified cycloaliphatic amine curing agent and 30 g of mixed solvent (cyclohexanone, methyl isobutyl ketone, xylene, and n-butanol in a mass ratio of 1:1:1:1) were added to the mixed slurry and stirred at 800 rpm for 10 min to obtain the finished antistatic and anticorrosive coating. Example 2

[0035] A method for preparing an antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft includes the following steps: 1 g of active polymer dispersant (BYK160), 1 g of leveling agent (BYK-331), and 2 g of silane coupling agent (β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane) were added to 25 g of mixed solvent (cyclohexanone, methyl isobutyl ketone, xylene, and n-butanol in a mass ratio of 1:1:1:1). The mixture was dispersed at 1000 rpm for 3 min using a high-speed disperser to obtain a mixed solution.

[0036] 35 g of mixed epoxy resin (the mass ratio of flexible epoxy resin, phenolic epoxy resin and bisphenol A type epoxy resin is 1:1:2) and 25 g of pigments and fillers (10 g of strontium chrome yellow, 10 g of zinc chrome yellow and 5 g of zinc phosphate) were slowly added to the above mixed solution and then ground and dispersed using a sand mill at 2000 rpm for 60 min to obtain a mixed slurry.

[0037] Add 10 g of conductive filler to the above mixed slurry and disperse it for 10 min at 1500 rpm using a high-speed disperser to ensure uniform mixing.

[0038] Finally, 20 g of silane-modified polyamide curing agent and 25 g of mixed solvent (cyclohexanone, methyl isobutyl ketone, xylene, and n-butanol in a mass ratio of 1:1:1:1) were added to the mixed slurry and stirred at 800 rpm for 10 min to obtain the finished antistatic and anticorrosive coating. Example 3

[0039] A method for preparing an antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft includes the following steps: 0.5 parts of active polymer dispersant (Solsperse™ 32500), 1 part of leveling agent (BYK-333), and 1.5 g of silane coupling agent (γ-aminopropyltriethoxysilane) were added to 30 g of mixed solvent (cyclohexanone, methyl isobutyl ketone, xylene, and n-butanol in a mass ratio of 1:1:1:1). The mixture was dispersed at 1000 rpm for 3 min using a high-speed disperser to obtain a mixed solution.

[0040] 60 g of mixed epoxy resin (the mass ratio of flexible epoxy resin, phenolic epoxy resin and bisphenol A type epoxy resin is 1:0.5:1.5) and 30 g of pigments and fillers (10 g of strontium chrome yellow, 10 g of zinc chrome yellow and 10 g of zinc phosphate) were slowly added to the above mixed solution, and the mixture was ground and dispersed using a sand mill at 2000 rpm for 60 min to obtain a mixed slurry.

[0041] Add 10 g of conductive filler to the above mixed slurry and disperse it for 10 min at 1500 rpm using a high-speed disperser to ensure uniform mixing.

[0042] Finally, 40 g of silane-modified cycloaliphatic amine curing agent and 30 g of mixed solvent (cyclohexanone, methyl isobutyl ketone, xylene, and n-butanol in a mass ratio of 1:1:1:1) were added to the mixed slurry and stirred at 800 rpm for 10 min to obtain the finished antistatic and anticorrosive coating. Example 4

[0043] A method for preparing an antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft includes the following steps: 1 g of active polymer dispersant (Solsperse™ 32500), 2 g of leveling agent (BYK-331), and 2 g of silane coupling agent (γ-aminopropyltriethoxysilane) were added to 40 g of mixed solvent (cyclohexanone, methyl isobutyl ketone, xylene, and n-butanol in a mass ratio of 1:1:1:1). The mixture was dispersed at 1000 rpm for 3 min using a high-speed disperser to obtain a mixed solution.

[0044] 50 g of mixed epoxy resin (the mass ratio of flexible epoxy resin, phenolic epoxy resin and bisphenol A type epoxy resin is 1:1.5:2.5) and 30 g of pigments and fillers (10 g of strontium chrome yellow, 15 g of zinc chrome yellow and 5 g of zinc phosphate) were slowly added to the above mixed solution, and the mixture was ground and dispersed using a sand mill at 2000 rpm for 60 min to obtain a mixed slurry.

[0045] Add 20 g of conductive filler to the above mixed slurry and disperse it for 10 min at 1500 rpm using a high-speed disperser to ensure uniform mixing.

[0046] Finally, 35 g of silane-modified polyamide curing agent and 40 g of mixed solvent (cyclohexanone, methyl isobutyl ketone, xylene, and n-butanol in a mass ratio of 1:1:1:1) were added to the mixed slurry and stirred at 1000 rpm for 10 min to obtain the finished antistatic and anticorrosive coating. Example 5

[0047] A method for preparing an antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft includes the following steps: 1 g of active polymer dispersant (BYK161), 1.5 g of leveling agent (AFCONA 7371), and 2.5 g of silane coupling agent (γ-(2,3-epoxypropoxy)propyltrimethoxysilane) were added to 30 g of mixed solvent (cyclohexanone, methyl isobutyl ketone, xylene, and n-butanol in a mass ratio of 1:1:1:1). The mixture was dispersed at 1000 rpm for 3 min using a high-speed disperser to obtain a mixed solution.

[0048] 40 g of mixed epoxy resin (the mass ratio of flexible epoxy resin, phenolic epoxy resin and bisphenol A type epoxy resin is 1:0.75:2) and 25 g of pigments and fillers (7.5 g strontium chrome yellow, 10 g zinc chrome yellow and 7.5 g zinc phosphate) were slowly added to the above mixed solution, and the mixture was ground and dispersed using a sand mill at 2000 rpm for 60 min to obtain a mixed slurry.

[0049] Add 15 g of conductive filler to the above mixed slurry and disperse it for 10 min at 1500 rpm using a high-speed disperser to ensure uniform mixing.

[0050] Finally, 30 g of silane-modified cycloaliphatic amine curing agent and 30 g of mixed solvent (cyclohexanone, methyl isobutyl ketone, xylene, and n-butanol in a mass ratio of 1:1:1:1) were added to the mixed slurry and stirred at 1000 rpm for 10 min to obtain the finished antistatic and anticorrosive coating.

[0051] The antistatic and anticorrosive coatings prepared in Examples 1-5 of this application were tested according to the testing standards shown in Table 1 below. The test results, obtained according to the testing standards shown in Table 1, are shown in Table 2 below.

[0052] Table 1

[0053] Table 2

[0054] The test results in Table 2 show that the antistatic and anti-corrosion coating material for the integrated fuel tank of aircraft of the present invention has a fast surface drying speed and good compatibility with various substrates such as sealants and aluminum alloys for integrated fuel tanks of aircraft. While promoting the natural discharge and dissipation of static charge on the surface of the integrated fuel tank of aircraft, it also has a long-term anti-corrosion function, which can protect the safety of the integrated fuel tank of aircraft in harsh environments such as humid heat and salt spray.

[0055] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft, characterized in that: It includes the following components in parts by weight: 20-50 parts pigments and fillers, 30-70 parts epoxy resin, 5-20 parts conductive filler, 0.5-1 part active polymer dispersant, 1-2 parts leveling agent, 0.5-2.5 parts silane coupling agent, 20-50 parts curing agent, and 50-100 parts mixed solvent.

2. The antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft according to claim 1, characterized in that: The pigments and fillers include pigments and anti-corrosion fillers, with a mass ratio of pigment to anti-corrosion filler of 1:(0.2~0.5); the pigments are chromate system pigments, including strontium chrome yellow and zinc chrome yellow, with a mass ratio of strontium chrome yellow and zinc chrome yellow of 1:(0.5~1.5); the anti-corrosion filler is zinc phosphate.

3. The antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft according to claim 1, characterized in that: The epoxy resin is a mixture of flexible epoxy resin, phenolic epoxy resin and bisphenol A type epoxy resin, with a mass ratio of 1:(0.5~1.5):(1.5~2.5).

4. The antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft according to claim 1, characterized in that: The conductive filler is potassium titanate whiskers.

5. The antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft according to claim 1, characterized in that: The active polymer dispersant is selected from BYK161, BYK160, and Solsperse™ 32500.

6. The antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft according to claim 1, characterized in that: The leveling agent is selected from one or more of AFCONA 7371, BYK-331 and BYK-333.

7. The antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft according to claim 1, characterized in that: The silane coupling agent is selected from one or more of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane and γ-aminopropyltriethoxysilane.

8. The antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft according to claim 1, characterized in that: The curing agent is selected from one or more of silane-modified alicyclic amine curing agents and silane-modified polyamide curing agents.

9. The antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft according to claim 1, characterized in that: The mixed solvent is a mixture of cyclohexanone, methyl isobutyl ketone, xylene, and n-butanol in a mass ratio of 1:(0.5~1):(1.5~2):(1~1.5).

10. A method for preparing an antistatic and anti-corrosion coating material for the surface of an integrated fuel tank of an aircraft as described in any one of claims 1-9, characterized in that: Includes the following steps: S1. Take 50% of the total mass of the mixed solvent and disperse the active polymer dispersant, leveling agent and silane coupling agent in it to obtain a mixed solution; S2. Add epoxy resin and pigments and fillers to the mixed solution obtained in step S1 in sequence, grind and mix well to obtain a mixed slurry; S3. Disperse the conductive filler in the mixed slurry obtained in step S2 to obtain the mixed slurry; S4. Add the curing agent and the remaining mixed solvent to the mixed slurry obtained in step S3, stir, and obtain the finished antistatic and anticorrosive coating.

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