High shielding light weight anticorrosive coating for composite material and preparation method thereof

Abstract

The application discloses a kind of composite material with high shielding light weight anticorrosive coating is composed of binder, curing agent.The binder is composed of polyhydroxy epoxy resin, silane end-capped epoxy resin, graphene, aluminum powder, pigment and filler, wetting agent, auxiliary agent and solvent 1;The silane end-capped epoxy resin is prepared by specific synthesis process from liquid epoxy resin, silane monomer and solvent 3;The curing agent is composed of multifunctional polyurethane resin, poly-epsilon-caprolactone modified polyurethane resin, and solvent 2;The poly-epsilon-caprolactone modified polyurethane resin is prepared by specific synthesis process from diisocyanate monomer, poly-epsilon-caprolactone dihydric alcohol, monomer dihydric alcohol, catalyst and solvent 4.The coating material is suitable for various aircraft composite material structures and skin anticorrosion protection, can realize excellent shielding effect under the condition of ≤20 μm coating thickness, give composite material excellent medium resistance and anticorrosion.

Description

Technical Field

[0001] This invention relates to the field of anti-corrosion coatings, specifically to a high-shielding lightweight anti-corrosion coating for composite materials and its preparation method. Background Technology

[0002] Composite materials are made by combining matrix materials such as synthetic resins and rubber with reinforcing materials such as high-strength glass fibers, carbon fibers, aramid fibers, silicon carbide fibers, and metals. They are characterized by their light weight and high strength. Since the 1970s, the proportion of composite materials in the structural weight of aircraft has been continuously increasing. Taking Boeing and Airbus, the two major aircraft manufacturers, as examples, the weight of composite materials in Boeing's 787 aircraft has reached 50%, while Airbus' A350 has even exceeded 50%, reaching an unprecedented 52%. Replacing traditional metal materials with composite materials can effectively reduce the structural weight of aircraft, increase aviation fuel efficiency, and improve the aircraft's range. This has, to a certain extent, promoted the development of the entire aviation manufacturing industry. In addition, the high toughness of composite materials can also avoid safety factors such as structural component fracture caused by fatigue stress in metal structural components.

[0003] Composite materials are high-toughness polymers, possessing characteristics such as acid and alkali resistance and high toughness. However, they suffer from deficiencies in aging resistance and water resistance, especially under the combined effects of corrosive substances and fatigue loads, which can easily lead to a decrease in strength. Simultaneously, moisture, salt spray, and high temperatures can accelerate material failure, causing a rapid decline in the load-bearing capacity and other mechanical properties of the materials and structural components, posing a significant threat to the safety and reliability of aircraft. Research and practical applications have demonstrated that applying a protective coating to the material can effectively isolate it from various environmental corrosive factors and impart the coating material's outstanding corrosion resistance and media resistance properties to the composite material, thereby enhancing its resistance to environmental erosion and extending the lifespan of composite structural components.

[0004] When composite materials are used in aircraft as high-toughness materials, the application environment is often dynamic load environment, accompanied by continuous micro-deformation. Traditional structural anti-corrosion coatings mostly use amine-cured epoxy resin as the film-forming material, which is a hard material. However, as composite materials are high-toughness materials, the mechanical modulus of the hard coating material is mismatched with the material, and long-term use will result in abnormal phenomena such as coating cracking and peeling. In addition, this type of anti-corrosion coating is mainly for metal materials such as aluminum alloys and magnesium alloys. Its anti-corrosion effect comes from the addition of a large number of anti-corrosion pigments and fillers, such as zinc chromate yellow, strontium chromate yellow, and phosphates, based on the "passivation and corrosion inhibition" mechanism. However, as non-metallic materials, the anti-corrosion of composite materials should focus on preventing direct contact between the corrosive medium and the material. Therefore, traditional hard anti-corrosion coatings for metal materials are not suitable for the protection of composite materials, especially in dynamic load environments such as aircraft. Furthermore, a high thickness (≥40μm) is a prerequisite for the effectiveness of traditional anti-corrosion coatings. However, the high weight resulting from high film thickness is not conducive to the lightweight characteristics of composite materials and does not conform to the development trend of modern aircraft manufacturing technology.

[0005] The purpose of this invention is to address the shortcomings of hard anti-corrosion coatings for metallic materials being unsuitable for composite materials by preparing a lightweight anti-corrosion coating with high toughness and high shielding performance. This material is suitable for the anti-corrosion protection of composite material structures of various aircraft, especially in continuous dynamic load environments, and can also be used for the anti-corrosion protection of integral skins. It solves the problems of high film thickness, mismatch with the mechanical modulus of composite materials, and easy cracking and peeling of traditional hard coatings.

[0006] This invention focuses on the problem that existing hard anti-corrosion coatings for metal materials are not suitable for the protection of composite materials. It conducts targeted professional research and prepares a high-shield lightweight anti-corrosion coating for composite materials. This coating material is suitable for the anti-corrosion protection of various aircraft composite material structures and skins. It can achieve excellent shielding effect under the condition of coating thickness ≤20μm, and endow composite materials with excellent media resistance and corrosion resistance.

[0007] A high-shield, lightweight anti-corrosion coating for composite materials is composed of a base material and a curing agent.

[0008] The base material is composed of polyhydroxy epoxy resin, silane-terminated epoxy resin, graphene, aluminum powder, pigments and fillers, wetting agent, additives and solvent 1; wherein, the silane-terminated epoxy resin is self-made and is prepared by liquid epoxy resin, silane monomer and solvent 3 through a specific synthesis process.

[0009] The curing agent is composed of a multifunctional polyurethane resin, a poly(ε-caprolactone) modified polyurethane resin, and a solvent 2; wherein the poly(ε-caprolactone) modified polyurethane resin is self-made and is prepared by a specific synthesis process from diisocyanate monomer, poly(ε-caprolactone) diol, monomeric diol, catalyst, and solvent 4.

[0010] The formulation of silane-terminated epoxy resin in the base material of high-shield lightweight anti-corrosion coatings for composite materials, by weight percentage, is as follows:

[0011] Liquid epoxy resin 40%~52%

[0012] Silane monomers 18%~30%

[0013] Solvent 3 25%~35%

[0014] The liquid epoxy resin is any one or a mixture of two or more bisphenol A type epoxy resins with an epoxy value ≥ 0.3.

[0015] The silane monomer is any one of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, anilinemethyltriethoxysilane, and 3-aminopropyltrimethoxysilane.

[0016] The solvent 3 is any one of xylene, propylene glycol methyl ether acetate, and methyl isobutyl ketone.

[0017] The formulation of the base material for high-shield lightweight anti-corrosion coatings for composite materials, by weight percentage, is as follows:

[0018] Polyhydroxy epoxy resin 10%~15%

[0019] 5%~10% silane-terminated epoxy resin

[0020] Graphene oxide 0.5%~1%

[0021] Aluminum powder 1%~2%

[0022] Pigments and fillers 35%~45%

[0023] Wetting and dispersing agent 1%~2%

[0024] Additives 1%~2%

[0025] Solvent 1 30%~40%

[0026] The polyhydroxy epoxy resin is any one or a mixture of two or more bisphenol A type epoxy resins with an epoxy value ≤ 0.04.

[0027] The graphene oxide mentioned is a commercially available product with ≤10 layers.

[0028] The aluminum powder is a commercially available, non-floating, flaky aluminum powder with a particle size ≤15μm.

[0029] The pigments and fillers are combinations of one of commercially available rutile titanium dioxide and cadmium oxide green with any one or more of mica powder, talc powder, kaolin, and ultrafine barium sulfate; by mass percentage, rutile titanium dioxide and cadmium oxide green account for 45% to 65% of the total amount of pigments and fillers.

[0030] The wetting and dispersing agent is a commercially available, product-grade supramolecular pigment dispersant.

[0031] The additives are one or more of acrylate leveling agents, one or more of organosilicon substrate wetting agents, one or more of polymer non-silicone defoamers, and one or more of organobentonite.

[0032] Solvent 1 is a combination of at least one or more of acetone, butanone, ethyl acetate, and butyl acetate, and one or more of methyl isobutyl ketone, isophorone, and xylene, and one or more of cyclohexanone and propylene glycol methyl ether acetate.

[0033] The formulation of the curing agent for high-shield lightweight anti-corrosion coatings for composite materials, by weight percentage, is as follows:

[0034] Multifunctional polyurethane resin 25%~35%

[0035] Poly(ε-caprolactone) modified polyurethane resin 25%~35%

[0036] Solvent 2 35%~45%

[0037] The multifunctional polyurethane resin is any one of HDI biuret, HDI trimer, TDI trimer, and IPDI trimer.

[0038] Solvent 2 is any one of butyl acetate, xylene, propylene glycol methyl ether acetate, and dipropylene glycol dimethyl ether.

[0039] The formulation of the poly(ε-caprolactone) modified polyurethane resin, by mass percentage, is as follows:

[0040] Diisocyanate monomer 35%~45%

[0041] Poly(ε-caprolactone) diol 28%~35%

[0042] Monomer diols 1.5%~5%

[0043] Catalyst 0.15%~0.8%

[0044] Solvent 4 20%~30%

[0045] The diisocyanate monomer is any one of TDI, IPDI, and XDI.

[0046] The poly(ε-caprolactone) diol has a molecular weight ≤1000 and is a difunctional compound that is liquid at room temperature.

[0047] The monomeric diol is any one of 1,4-butanediol, 1,6-hexanediol, diethylene glycol, and diethylene glycol monohydrate.

[0048] The catalyst is either zinc isooctanoate or zinc neodecanoate.

[0049] Solvent 4 is any one of xylene, butyl acetate, and propylene glycol methyl ether acetate.

[0050] A method for preparing a high-shield, lightweight, anti-corrosion coating for composite materials includes the following steps: preparing materials according to the above-described formula, wherein the preparation process of the silane-terminated epoxy resin used as the base material is as follows:

[0051] Stoichiometric amounts of liquid epoxy resin and solvent 3 were added to a reactor and refluxed for 2 hours to dehydrate. The temperature was then lowered to below 30°C. Silane monomers were slowly added dropwise under stirring. After the system was exothermic, the temperature was raised to 50°C to 60°C. The reaction was carried out for 4 to 6 hours. The solid content was then adjusted to 75% ± 2% to obtain silane-terminated epoxy resin.

[0052] Add measured amounts of polyhydroxy epoxy resin, silane-terminated epoxy resin, wetting and dispersing agent, additives, and solvent 1 to the cylinder. After dissolving evenly, add graphene oxide and pigments and fillers, disperse evenly, transfer to a nano-sand mill and grind to a fineness ≤15μm. Add aluminum powder, disperse evenly at high speed, filter and discharge to obtain the high-shield lightweight anti-corrosion coating base material for composite materials.

[0053] The preparation process of the poly(ε-caprolactone) modified polyurethane resin used in the curing agent is as follows:

[0054] At room temperature, diisocyanate monomer, catalyst, and solvent 4 are added to a reactor. Poly(ε-caprolactone) diol is added while stirring. The temperature is raised to 50℃~60℃ and kept at this temperature for 2 hours. Then, the temperature is lowered to below 30℃, monomeric diol is added, and the temperature is raised to 80℃~85℃. After keeping at this temperature for 4~6 hours, the temperature is lowered and the product is discharged to obtain poly(ε-caprolactone) modified polyurethane resin.

[0055] Multifunctional polyurethane resin, poly(ε-caprolactone) modified polyurethane resin and solvent 2 are added to a suitable container, stirred evenly and discharged to obtain a high-shield lightweight anti-corrosion coating curing agent for composite materials.

[0056] The beneficial effects of this invention are:

[0057] This invention relates to the preparation of silane-terminated epoxy resin as the base material, its blending ratio with polyhydroxy epoxy resin, the preparation of poly(ε-caprolactone) modified polyurethane resin in the curing agent, its blending ratio with multifunctional polyurethane resin, and the introduction of graphene-blended flake aluminum powder. Specifically, the silane-terminated epoxy resin in the base material improves the wetting properties of the coating and forms chemical bonds with the surface of the composite material, ensuring the coating's long-lasting and effective adhesion. The polyhydroxy epoxy resin provides dense reactive groups (-OH), effectively increasing the crosslinking density of the coating and imparting extremely strong resistance to media to the protective coating. The poly(ε-caprolactone) modified polyurethane resin has a linear structure, which imparts excellent toughness to the protective coating, while the multifunctional polyurethane resin imparts outstanding strength to the protective coating material. Together with the poly(ε-caprolactone) modified polyurethane resin, they contribute to the high strength and toughness of the protective coating material.

[0058] This invention relates to a method for preparing a high-shielding, lightweight anti-corrosion coating for composite materials. This method has the following beneficial effects:

[0059] Based on polyhydroxy epoxy resin, a high density of active crosslinking points is provided for the curing of the coating, ensuring the excellent resistance of the protective coating to media. Silane-terminated epoxy resin was prepared and modified with the base material. On the one hand, the low surface energy of silane can enhance the fluidity and wetting properties of the liquid coating, promoting the coating to flow into the micro-pits and micro-cracks on the material surface for curing, thus producing an anchoring effect. On the other hand, the products of silane hydrolysis can bond with the active groups on the surface of the composite material to produce high-strength chemical bonds. The two resins work synergistically to ensure the coating's long-lasting and effective adhesion strength in corrosive media environments.

[0060] Using poly(ε-caprolactone) modified polyurethane resin with linear structure and multifunctional polyurethane resin as composite curing agent, the linear structure gives the protective coating excellent toughness, and the multifunctional structure gives the protective coating material outstanding strength. The two characteristics work together to give the protective coating material both toughness and strength.

[0061] The graphene and aluminum powder used are both sheet-like structures with a high aspect ratio, two-dimensional planar structure, and good shielding effect. The two materials overlap to form a multi-layered shielding layer arranged in parallel within the material, cutting off the penetration path of external corrosive media from multiple angles, so that the protective coating exhibits extremely high shielding performance. Detailed Implementation

[0062] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0063] 540g of bisphenol A epoxy resin E-51 and 315g of xylene were added to the reaction vessel. After reflux and dehydration for 2 hours, the mixture was cooled to room temperature. 196g of γ-aminopropyltrimethoxysilane was added using a dropwise feeding process. After the system was exothermic, the temperature was raised to 60℃ and the reaction was carried out for 6 hours. The solid content was adjusted to 75%±2% to obtain silane-terminated epoxy resin A.

[0064] Add 316g of polyhydroxy epoxy resin E-06, 171g of silane-terminated epoxy resin A, 937g of solvent (250g of methyl ethyl ketone, 437g of xylene, and 250g of propylene glycol methyl ether acetate), 50g of wetting and dispersing agent DISUPER S24, 7.65g of leveling agent BYK-354, 2.55g of substrate wetting agent BYK-333, 7.65g of defoamer UNIQ FOAM 158S, and 7.65g of bentonite BENGEL828 to a grinding container. After dissolving evenly, add 20g of graphene TNGO-3, 550g of titanium dioxide, and 430g of mica powder. Disperse evenly and transfer to a nano-sand mill to grind until the fineness is ≤15μm. Add 40g of aluminum powder F8008, disperse evenly at high speed, and filter to obtain the high-shield lightweight anti-corrosion coating base material for composite materials.

[0065] (2) Preparation of curing agent

[0066] At room temperature, 222.2g of diisocyanate monomer IPDI, 1g of zinc isooctanoate, and 139g of xylene were added to the reaction vessel. Under stirring, 190g of terminal poly(ε-caprolactone) diol PCL-2044 was added, the temperature was raised to 60℃, and the reaction was maintained for 2 hours. Then the temperature was lowered to below 30℃, 10g of monomeric diol 1,4-butanediol was added, the temperature was raised to 80℃, and the reaction was maintained for 4-6 hours. After cooling, the product was discharged to obtain poly(ε-caprolactone) modified polyurethane resin A used as a curing agent for high-shield lightweight anti-corrosion coatings for composite materials.

[0067] Add 254g of multifunctional polyurethane resin N-75 (HDI biuret), 251g of poly(ε-caprolactone) modified polyurethane resin A, and 345g of butyl acetate to a suitable container, stir evenly, and then discharge to obtain a high-shield lightweight anti-corrosion coating curing agent for composite materials.

[0068] (3) Paint preparation and application

[0069] Take the base material prepared in step (1) and the curing agent prepared in step (2), mix them in a weight ratio of 3:1, apply the paint by spraying, dry it under standard conditions for 14 days, and then test its performance.

[0070] (4) Implementation effect

[0071] The properties of the high-shielding lightweight anti-corrosion coating for the composite material prepared in Example 1 are shown in the table below:

[0072] Example 2:

[0073] (1) Base material preparation

[0074] 530g of bisphenol A epoxy resin E-44 and 325g of xylene were added to the reaction vessel. After reflux and dehydration for 2 hours, the mixture was cooled to room temperature. 196g of γ-aminopropyltriethoxysilane was added using a dropwise feeding process. After the system was exothermic, the temperature was raised to 60℃ and the reaction was carried out for 6 hours. Xylene was added to adjust the solid content to 75%±2%, and silane-terminated epoxy resin B was obtained.

[0075] Add 316g of polyhydroxy epoxy resin E-06, 171g of silane-terminated epoxy resin B, 937g of solvent (250g of methyl ethyl ketone, 437g of xylene, and 250g of propylene glycol methyl ether acetate), 50g of wetting and dispersing agent DISUPER S24, 7.65g of leveling agent BYK-354, 2.55g of substrate wetting agent BYK-333, 7.65g of defoamer UNIQ FOAM 158S, and 7.65g of bentonite BENGEL828 to a grinding container. After dissolving evenly, add 20g of graphene TNGO-3, 550g of chromium oxide green, and 430g of mica powder. Disperse evenly and transfer to a nano-sand mill to grind to a fineness ≤15μm. Add 40g of aluminum powder F8008, disperse evenly at high speed, and filter to obtain the high-shield lightweight anti-corrosion coating base material for composite materials.

[0076] (2) Preparation of curing agent

[0077] At room temperature, 222.2g of diisocyanate monomer IPDI, 1g of zinc isooctanoate, and 139g of xylene were added to the reaction vessel. Under stirring, 190g of terminal poly(ε-caprolactone) diol PCL-2044 was added, the temperature was raised to 60℃, and the reaction was maintained for 2 hours. Then, the temperature was lowered to below 30℃, and monomeric diol 1,4-butanediol was added. The temperature was raised to 80℃, and the reaction was maintained for 4 to 6 hours. After cooling, the material was discharged to obtain poly(ε-caprolactone) modified polyurethane resin B used as a curing agent for high-shield lightweight anti-corrosion coatings for composite materials.

[0078] Add 240g of multifunctional polyurethane resin N-75 (HDI biuret), 251g of poly(ε-caprolactone) modified polyurethane resin B, and 359g of butyl acetate to a suitable container, stir evenly, and then discharge to obtain a high-shield lightweight anti-corrosion coating curing agent for composite materials.

[0079] (3) Paint preparation and application

[0080] Take the base material prepared in step (1) and the curing agent prepared in step (2), mix them in a weight ratio of 3:1, apply the paint by spraying, dry it under standard conditions for 14 days, and then test its performance.

[0081] (4) Implementation effect

[0082] The properties of the high-shielding lightweight anti-corrosion coating for the composite material prepared in Example 2 are shown in the table below:

[0083] This disclosure has been described with reference to the foregoing embodiments; however, these embodiments are merely examples for implementing this disclosure. It must be noted that the disclosed embodiments do not limit the scope of this disclosure. On the contrary, any changes and modifications made without departing from the spirit and scope of this disclosure are within the scope of patent protection of this disclosure.

Claims

1. A high shielding, light weight, anticorrosive coating for composite materials, characterized by: The base material is prepared from a base material and a curing agent in a weight ratio of 3:0.8-1.2, wherein the base material is prepared from a polyhydroxy epoxy resin, a silane-terminated epoxy resin, graphene oxide, aluminum powder, a pigment filler, a wetting dispersant, an auxiliary agent, and a solvent 1; the curing agent is prepared from a multifunctional polyurethane resin, a poly-ε-caprolactone modified polyurethane resin, and a solvent 2; The base material is prepared from the following components in mass percentage: Polyhydroxy epoxy resin 10-15% Silane-terminated epoxy resin 5-10% Graphene oxide 0.5-1% Aluminum powder 1-2% Pigment filler 35-45% Wetting dispersant 1-2% Auxiliary agent 1-2% Solvent 1 30-40%; The curing agent is prepared from the following components: Multifunctional polyurethane resin 25-35% Poly-ε-caprolactone modified polyurethane resin 25-35% Solvent 2 35-45%; The silane-terminated epoxy resin is prepared from 40-52% liquid epoxy resin, 18-30% silane monomer, and 25-35% solvent 3 in mass percentage, and the preparation method comprises the following steps: adding stoichiometric liquid epoxy resin and solvent 3 into a reaction kettle for reflux dehydration treatment for 2 hours, cooling to below 30°C, slowly adding the silane monomer in a dropwise process under stirring, heating to 50-60°C after the heat release of the system, and adding to adjust the solid content to 75%±2% after 4-6 hours of reaction to obtain the silane-terminated epoxy resin; The liquid epoxy resin is a mixture of one or more types of bisphenol A epoxy resin with an epoxy value of ≥0.3; the silane monomer is any one of γ-aminopropyl trimethoxysilane, γ-aminopropyl triethoxysilane, anilino methyl triethoxysilane, and 3-aminopropyl trimethoxysilane; and the solvent 3 is any one of xylene, propylene glycol methyl ether acetate, and methyl isobutyl ketone; The polyhydroxy epoxy resin is a mixture of one or more types of bisphenol A epoxy resin with an epoxy value of ≤0.04; The poly-ε-caprolactone modified polyurethane resin is prepared from the following components in mass percentage: Diisocyanate monomer 35-45% Poly-ε-caprolactone diol 28-35% Monomer diol 1.5-5% Catalyst 0.15-0.8% Solvent 4 20-30%; The poly-epsilon-caprolactone modified polyurethane resin preparation method is as follows: the diisocyanate monomer, the catalyst and the solvent 4 are added into a reaction kettle at normal temperature, the poly-epsilon-caprolactone dihydric alcohol is put in under stirring, the temperature is raised to 50-60 DEG C, the temperature is kept for 2 hours, the temperature is lowered to below 30 DEG C, the monomer dihydric alcohol is added, the temperature is raised to 80-85 DEG C, the temperature is kept for 4-6 hours, the temperature is lowered to discharge, and the poly-epsilon-caprolactone modified polyurethane resin for the composite material high shielding light weight anticorrosive paint curing agent is obtained.

2. The high shielding, light weight, corrosion protective coating for composite materials according to claim 1, characterized in that: The graphene oxide is a commercially available graphene oxide with a layer number of less than 10; the aluminum powder is a commercially available non-floating flaky aluminum powder with a particle size of less than 15 microns; the wetting dispersant is a commercially available supramolecular pigment dispersant; and the auxiliary agent is a mixture of one or more kinds of acrylate leveling agents, one or more kinds of silicone-based substrate wetting agents, one or more kinds of polymeric non-silicon defoaming agents and one or more kinds of organic bentonite.

3. The high barrier, light weight, corrosion protective coating for composite materials of claim 1, wherein: The color filler is a mixture of one or more kinds of rutile titanium dioxide and cadmium oxide green combined with any one or more of mica powder, talc, kaolin and ultra-fine barium sulfate; the rutile titanium dioxide and the cadmium oxide green account for 45-65% of the total color filler.

4. The high barrier, light weight, corrosion protective coating for composite materials of claim 1, wherein: The solvent 1 is a mixture of any one or more of acetone, butanone, ethyl acetate and butyl acetate combined with any one or more of methyl isobutyl ketone, isophorone, xylene and any one of cyclohexanone and propylene glycol methyl ether acetate.

5. The high barrier, light weight, corrosion protective coating for composite materials of claim 1, wherein: The multifunctional polyurethane resin is any one of HDI biuret, HDI trimer, TDI trimer and IPDI trimer; and the solvent 2 is any one of butyl acetate, xylene, propylene glycol methyl ether acetate and dipropylene glycol dimethyl ether.

6. Process for the preparation of a high shielding light weight anticorrosive coating material for composite materials according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: (1) Base preparation: a measured amount of polyhydroxy epoxy resin, silane-terminated epoxy resin, wetting dispersant, auxiliary agent and solvent 1 are added into a cylinder, and after being dissolved uniformly, the graphene oxide and the color filler are added and uniformly dispersed, and then the mixture is transferred to a nano sand mill for grinding to a fineness of less than 15 microns, and then the aluminum powder is added, uniformly dispersed at high speed and filtered to obtain a base for a composite material high shielding light weight anticorrosive paint; (2) Curing agent preparation: the multifunctional polyurethane resin, the poly-epsilon-caprolactone modified polyurethane resin and the solvent 2 are added into a suitable container, stirred uniformly and discharged to obtain a curing agent for a composite material high shielding light weight anticorrosive paint; (3) The base and the curing agent are mixed in a certain proportion to obtain a composite material high shielding light weight anticorrosive paint.

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