Nano modified polyaspartic acid ester heavy anti-corrosion coating and preparation method thereof

Abstract

The invention relates to the related technical field of coatings, and provides a nano-modified polyaspartic acid ester heavy anti-corrosion coating and a preparation method thereof. The coating comprises a component A and a component B, wherein the component A comprises polyaspartic acid ester, a titanium nano polymer, a graphene dispersion liquid, rutile titanium dioxide, carbon black, a dispersing agent, a defoaming agent, a flatting agent, a thixotropic agent and an ultraviolet light absorber, and the component B comprises an HDI tripolymer, an elastic curing agent, a solvent and a water absorbent. The preparation method of the coating comprises the following steps: preparation of the component A: preparing a titanium nano polymer, preparing a graphene dispersion liquid and mixing and stirring all the component A in proportion; and preparation of the component B: adding all the component B into the stirring tank, stirring and mixing uniformly at a medium speed, and filtering to obtain the component B. The curing time of the coating provided by the invention is adjustable and controllable, and a coating film has the characteristics of excellent adhesive force, impact resistance, wear resistance, salt fog resistance, weather resistance and the like.

Description

Technical Field

[0001] This invention relates to the field of heavy-duty anti-corrosion industrial coatings, specifically to a nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating and its preparation method. Background Technology

[0002] Conventional industrial anti-corrosion coatings are mostly solvent-based coatings with a solid content of around 50%. Due to the high content of organic solvents, they not only waste energy but also pollute the environment, harm human health, and pose safety hazards. Therefore, with increasingly stringent environmental protection requirements, the application and development of high-solids-content, solvent-free, water-based, and powder-based anti-corrosion coatings has become an inevitable trend.

[0003] Sprayed polyurea anti-corrosion coating is a solvent-free, highly reactive, fast-curing, and environmentally friendly coating. However, its application requires specialized high-temperature and high-pressure impact spraying equipment. Due to its rapid curing speed, sprayed polyurea anti-corrosion coating has poor wetting properties and adhesion to the substrate, and is prone to pitting and skinning on the surface. Therefore, it is not suitable for use in highly corrosive media and harsh environments.

[0004] Polyaspartic acid ester polyurea is a novel aliphatic, slow-reacting, and tunable polyurea material. Anti-corrosion coatings prepared from it can be applied using traditional spraying equipment, with adjustable and controllable curing time, and the coating film exhibits excellent leveling properties, durability, and color retention. To improve the mechanical strength, abrasion resistance, heavy-duty corrosion resistance, and durability of polyaspartic acid ester polyurea coatings for application in aerospace, marine, oilfield, petrochemical, and highly corrosive environments, this invention provides a nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating and its preparation method. Summary of the Invention

[0005] To address the problems of existing polyurea coating application methods, which require specialized high-temperature and high-pressure impact spraying equipment and suffer from poor substrate wetting and adhesion due to excessively fast curing speeds, resulting in surface pitting and skinning, this invention provides a nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating and its preparation method.

[0006] To achieve the above objectives, the present invention provides the following technical solution: On one hand, the present invention provides a nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating, which comprises the following components by mass percentage: Based on parts by mass, it includes the following components: Component A consists of 2 portions, and component B consists of 1 portion. Component A comprises, by mass parts: 40-70 parts of composite polyaspartic acid ester, 10-20 parts of titanium nanopolymer, 10-20 parts of graphene dispersion, 25-35 parts of rutile titanium dioxide, 1-3 parts of carbon black, 1-2 parts of dispersant, 0.2-0.5 parts of defoamer, 0.3-0.5 parts of leveling agent, 0.5-1.5 parts of thixotropic agent, 0.3-1.0 parts of fumed SiO2, and 0.3-0.5 parts of ultraviolet absorber; Component B comprises the following components by mass: 50-70 parts of HDI trimer, 10-30 parts of elastic curing agent, 10-20 parts of solvent, and 1-4 parts of water-absorbing agent.

[0007] On the other hand, the present invention provides a method for preparing a nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating, which includes the following steps: Preparation of S1 and A components: Preparation of S11 titanium nanopolymers: Polyaspartic acid ester, along with a certain proportion of silane coupling agent, dispersant, and solvent, is added to a mixing tank and stirred until dissolved to form a polymer solution. The polymer solution and titanium powder are then loaded into the grinding jar of a planetary ball mill and ball-milled in a certain proportion. The mixture is then ultrasonically dispersed using an ultrasonic disperser and filtered to produce titanium nanopolymers.

[0008] S12, Preparation of graphene dispersion: Silane-coated graphene is obtained by pretreating graphene powder. A certain proportion of solvent, dispersant, and defoamer are added to a dispersion tank and stirred evenly. Then, the surface silane-coated graphene powder is added, dispersed at high speed, and then transferred to a basket nano-dispersing mill for dispersion and grinding. Finally, it is dispersed by ultrasonication to prepare a graphene dispersion.

[0009] S13. Preparation of Component A by mixing and stirring: Add polyaspartic ester to the dispersion tank in proportion, add the corresponding proportion of titanium nanopolymer, graphene dispersion, dispersant, defoamer, pigments and fillers under medium speed stirring, disperse at high speed for 30 minutes, then grind to a fineness of less than 15 μm using a sand mill, add leveling agent, thixotropic agent, and ultraviolet absorber, stir evenly to obtain Component A.

[0010] Preparation of components S2 and B: According to the specified proportions, HDI trimer, elastic curing agent, solvent, and water absorbent are added sequentially to a mixing tank and mixed evenly at medium speed. After filtration, component B is obtained.

[0011] Compared with the prior art, the present invention provides a nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating, which has the following beneficial effects: This invention utilizes the slow-reaction and controllable properties of polyaspartic acid ester polyurea to prepare anti-corrosion coatings. It can be applied using traditional spraying equipment, and the curing time is adjustable and controllable. The coating film has excellent adhesion, impact resistance, abrasion resistance, salt spray resistance, and weather resistance, making it suitable for the coating protection of facilities in aerospace, marine, oilfield, petrochemical, and highly corrosive environments. Attached Figure Description

[0012] Figure 1 The flowchart illustrates the preparation method of component A in a nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating provided by this invention. Detailed Implementation

[0013] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the embodiments described by BYK are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0014] In this embodiment, the present invention provides a technical solution: This invention provides a nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating, comprising the following components by mass percentage: Based on parts by mass, it includes the following components: Component A consists of 2 portions, and component B consists of 1 portion. Component A comprises, by mass parts: 40-70 parts of composite polyaspartic acid ester, 10-20 parts of titanium nanopolymer, 10-20 parts of graphene dispersion, 25-35 parts of rutile titanium dioxide, 1-3 parts of carbon black, 1-2 parts of dispersant, 0.2-0.5 parts of defoamer, 0.3-0.5 parts of leveling agent, 0.5-1.5 parts of thixotropic agent, and 0.3-0.5 parts of ultraviolet absorber; Component B comprises the following components by mass: 50-70 parts of HDI trimer, 10-30 parts of elastic curing agent, 10-20 parts of solvent, and 1-4 parts of water-absorbing agent.

[0015] Components A and B should be stored separately and mixed evenly according to the specified ratio before spraying.

[0016] The composite polyaspartic ester includes one or more of polyaspartic ester F524, polyaspartic ester F520 and polyaspartic ester D2925; F524 is a solvent-free resin produced by Shenzhen Feiyang, containing secondary hydroxyl groups and capable of reacting with -NCO. It is a yellow, transparent liquid with a solid content ≥95%, NH equivalent (g / mol) 330, OH content 5.1%, and viscosity 800-1500 MPa. The basic properties of F524 resin are similar to F420, but the difference lies in its gel time exceeding 50 minutes when reacting with HDI trimer curing agents. Furthermore, its compatibility with silicone additives is far superior to F420, resulting in a significantly improved coating appearance.

[0017] The polyaspartic acid ester F520 is a solvent-free resin with secondary hydroxyl groups, produced by Shenzhen Feiyang, capable of reacting with -NCO. It is a slightly yellow, transparent liquid with a solid content ≥95%, NH equivalent (g / mol) 291, OH content 5.84%, and viscosity 1200-1500 MPa. Due to the crown-shaped alkyl side chain of the -NH group in the F520 molecular structure, coupled with the steric hindrance effect of the methyl group on its ortho-cycloalkane chain, the free rotation of the molecular chain formed after the reaction of the -NHR group and the isocyanate -NCO group to form a film is hindered, resulting in a high glass transition temperature (Tg) and poor impact resistance in the coating film. Studies have shown that coatings made from it and HDI trimer begin to become brittle below 10°C, completely losing adhesion to the substrate; therefore, its properties must be modified. Experiments have shown that a 1:1 ratio of F524 and F520 resins provides the best performance for a high-solids, low-viscosity coating. The activation period is 2-3 hours, and the surface drying time is 1 hour. This effectively solves the application challenges of polyaspartic acid ester coatings. The coating exhibits high activity, low viscosity, excellent leveling properties, flexibility, high hardness, high adhesion, weather resistance, resistance to corrosive media, and abrasion resistance.

[0018] Polyaspartic acid ester D2925 is a modified resin of polyaspartic acid ester produced by Shenzhen Feiyang. It is a polymeric macromolecular polyaspartic acid ester compound with a solids content of 60%, an NH equivalent (g / mol) of 1140, an OH content of 1.5%, a viscosity of 6000-1600 MPa, a longer gel time, and better flexibility, making it suitable for use with elastic curing agents in elastic coatings. It can be used in combination with F524 and F520 as the main resin for coatings. Adding an appropriate amount of D2925 can further improve the physical and mechanical properties and application performance of the coating film. When reacting with HDI trimer curing agent, the gel time can reach 3 hours, significantly improving application performance.

[0019] The HDI trimer used is HDI trimer N3390, with a solid content of 98%, a viscosity of 500 MPa, an NCO content of 19.6%, and a functionality of 3.5. It features low free monomer content, low viscosity, good stability, high film hardness, and good weather resistance. The polyaspartic ester coating is produced through the reaction of isocyanate groups (-NCO) with the amine groups (-NH) on the polyaspartic ester. When the NCO content is 1.1, the active hydrogen of the -NH group in the polyaspartic ester reacts precisely with the isocyanate, resulting in a block structure with uniform internal stress. The internal molecular chains have numerous hydrogen bonds, giving the coating excellent adhesion, flexibility, abrasion resistance, strength, and hardness.

[0020] The titanium nanopolymer is a titanium nano-polymer alloy modified by copolymerization of metallic titanium and polyaspartic acid ester. Its mechanism involves high-speed ball milling of titanium powder and polyaspartic acid ester in a planetary ball mill. The resulting mechanochemical effect is as follows: during ball milling, the titanium powder undergoes severe plastic deformation and evolves towards amorphous form, significantly reducing particle size and transforming into a plate-like structure. The electron orbital arrangement of titanium gives it electrophilic properties. When titanium powder is subjected to strong mechanical forces, the lattice size decreases significantly, the lattice becomes distorted, and the surface is activated, making it more susceptible to reaction with free radicals or free ions generated by the chain breakage of polyaspartic acid ester. Simultaneously, the polymer is prone to chain breakage under mechanical force, generating free electrons and ions. The activated titanium powder rapidly combines with these free electrons and ions, lowering the free energy and forming a stable, uniformly dispersed black titanium nanopolymer. The particle size is between 50 nm and 80 nm.

[0021] The properties of titanium nanopolymers are as follows: (1) Due to the introduction of titanium into the structure, it has excellent corrosion resistance and can withstand corrosion under various harsh working conditions. (2) It has stable performance, is resistant to natural aging, UV radiation, and electrochemical corrosion, and its lifespan is 2-5 times longer than that of traditional anti-corrosion coatings; (3) The polymer itself is conductive, resists stray currents, and has the special effect of shielding electromagnetic, radar and sonar waves, and is used for military camouflage; (4) Seawater corrosion test, corrosion threshold value: ≥100 years, that is, seawater has almost no corrosion on titanium nano-polymer alloy coating, marine anti-corrosion is recommended.

[0022] Titanium nanopolymers are titanium nanoparticle high molecular alloy polymer materials. In coating formulations, they can be used alone or as polymer materials to modify other film-forming resins. Considering material costs, this invention patent uses titanium nanopolymers as a modifying material.

[0023] The graphene described by BYK is a single-layer carbon atom sheet material peeled from graphite. It is a novel planar thin film composed of hexagonal honeycomb lattice formed by carbon atoms with sp2 hybrid orbitals. It is the thinnest and hardest nanomaterial in the world, with a hardness exceeding that of diamond. At the same time, it is stretchable like rubber. It is almost completely transparent, absorbing only 2.3% of light. Nanographene has extremely strong ultraviolet shielding properties.

[0024] Graphene nanoparticles possess a high specific surface area, high surface activity, strong adsorption, high surface energy, and high yield stress. This allows them to form a larger contact area with the matrix resin, generating more microcracks and elastic deformation, converting more impact energy into heat absorption, thereby improving the coating's adhesion, impact strength, and flexibility. Graphene's excellent electrical and thermal conductivity, chemical stability, and outstanding mechanical properties make it widely used in conductive coatings, heavy-duty anti-corrosion coatings, heat-dissipating coatings, fire-retardant coatings, and stone-impact resistant coatings. In polyaspartic acid ester coatings, when the graphene content reaches 0.5%, compared to the same formulation without graphene, the impact strength is increased by 30%, flexural strength by 42%, flexural modulus by 48%, compressive strength by 37.5%, adhesion by 36%, and corrosion resistance by 27%. It features low dosage and high efficiency.

[0025] The rutile titanium dioxide and carbon black described by BYKBYK are pigments. The rutile titanium dioxide used is rutile titanium dioxide R-706; the carbon black is high-pigment carbon black FW200.

[0026] Rutile titanium dioxide R-706 has small particle size, stable crystal structure, strong hiding power, high refractive index, high reflectivity to sunlight, and low oil and water absorption. It is chemically inert and has good corrosion resistance. High-pigment carbon black has fine particle size, strong tinting strength, excellent weather resistance, and good reinforcing effect.

[0027] Functional additives include: dispersants BYK-161 and BYK-110 (manufactured by BYK); defoamer BYK-A530 (manufactured by BYK); leveling agent BYK-333 (manufactured by BYK); UV absorber UV-1130 (manufactured by Xindalu); water remover molecular sieve 3A; and thixotropic agents are organo-bentonite and fumed SiO2. To achieve both suitable viscosity and high thixotropy in the nano-titanium / graphene modified polyaspartic acid ester polyurea heavy-duty anti-corrosion coating, and to enhance the sag thickness, organo-bentonite and fumed SiO2 were used in combination, achieving good results. The elastic curing agent was SP-103P, and the solvent was butyl acetate. Example

[0028] This embodiment provides a method for preparing a nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating, comprising the following steps: Preparation of S1 and A components: S11. Preparation of titanium nanopolymers: 50-70 parts of composite polyaspartic acid ester, 0.2-0.3 parts of silane coupling agent, 1.0-1.5 parts of dispersant, and 15-20 parts of butyl acetate solvent are added to a mixing tank and stirred until uniformly dissolved to prepare a polymer solution. The polymer solution and metallic titanium powder are loaded into the ball mill jar of a planetary ball mill at a ratio of 75-80:15-25, making the ball-to-material ratio 4:1. The milling speed is adjusted to 600 r / min, and the milling time is 6 h. Then, ultrasonic dispersion is performed for 0.5 h using an ultrasonic disperser. After filtration, the particle size is 50 nm-80 nm. Titanium nanopolymers are thus prepared.

[0029] S12, Preparation of graphene dispersion: Graphene powder pretreatment: Weigh 5-10 parts of dried graphene powder, add 90-95 parts of 95% ethanol and 1.5 parts of silane coupling agent mixed solvent, disperse ultrasonically for 40 min, transfer to a three-necked flask with reflux device and stir for 4 h, and vacuum dry at 80℃ to obtain silane-coated graphene.

[0030] Add 96 parts of solvent, 1 part of dispersant, and 0.3 parts of defoamer to a dispersion tank and stir evenly. Then add 3 parts of graphene powder coated with surface silane and disperse at high speed for 60 minutes. Transfer to a basket nano-dispersing mill and disperse and grind at high speed for 2 hours. Finally, disperse by ultrasonication for 30 minutes to obtain a particle size of less than 100 nm, thus preparing a 3% graphene dispersion.

[0031] S13. Mixing and stirring to prepare component A: In this embodiment, component A, by mass percentage, includes: 18 parts polyaspartic acid ester F524, 12 parts polyaspartic acid ester F520, 10 parts polyaspartic acid ester D2925, 10 parts titanium nanopolymer, 15 parts graphene dispersion, 0.5 parts dispersant BYK-161, 0.5 parts dispersant BYK-110, 0.2 parts defoamer BYK-A530, 35 parts rutile titanium dioxide R-706, 3 parts high-pigment carbon black FW200, 0.3 parts leveling agent BYK-333, 0.5 parts organobentonite, 0.5 parts fumed SiO2, and 0.5 parts ultraviolet absorber 1130.

[0032] Add 18 parts of polyaspartic acid ester F524, 12 parts of polyaspartic acid ester F520, and 8 parts of polyaspartic acid ester D2925 to a dispersion tank. Under medium-speed stirring, add 10 parts of titanium nanopolymer, 15 parts of graphene dispersion, 0.5 parts of dispersant BYK-161, 0.5 parts of dispersant BYK-110, 0.2 parts of defoamer BYK-A530, 35 parts of rutile titanium dioxide R-706, and 3 parts of high-pigment carbon black FW200. Disperse at high speed for 30 minutes, then grind to a fineness of less than 15 μm using a sand mill. Add 0.3 parts of leveling agent BYK-333, 0.5 parts of organobentonite, 0.5 parts of fumed SiO2, and 0.5 parts of UV absorber 1130. Stir until homogeneous to obtain component A.

[0033] Preparation of components S2 and B: In this embodiment, component B, by mass fraction, includes: 50 parts HDI trimer N3390, 25 parts elastic curing agent SP-103P, 15 parts butyl acetate, and 3 parts water-absorbing agent molecular sieve 3A.

[0034] HDI trimer, elastic curing agent, solvent, and water absorbent are added to a mixing tank in sequence according to the proportion. The mixture is stirred at medium speed until homogeneous, and then filtered to obtain component B. Example

[0035] This embodiment provides a method for preparing a nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating, comprising the following steps: Preparation of S1 and A components: S11. Preparation of titanium nanopolymers: Add 50-70 parts of polyaspartic acid ester, 0.2-0.3 parts of silane coupling agent, 1.0-1.5 parts of dispersant, and 15-20 parts of solvent to a mixing tank and stir until homogeneous to prepare a polymer solution. Load the polymer solution and titanium powder into the ball mill jar of a planetary ball mill at a ratio of 75-80:15-25, making the ball-to-material ratio 4:1. Adjust the speed to 600 r / min and ball mill for 6 hours. Then, add an ultrasonic disperser for ultrasonic dispersion for 0.5 hours. Filter, and the particle size is 50 nm-80 nm. Titanium nanopolymers are thus prepared.

[0036] S12, Preparation of graphene dispersion: Graphene powder pretreatment: Weigh 5-10 parts of dried graphene powder, add 90-95 parts of 95% ethanol and 1.5 parts of silane coupling agent mixed solvent, disperse ultrasonically for 40 min, transfer to a three-necked flask with reflux device and stir for 4 h, and vacuum dry at 80℃ to obtain silane-coated graphene.

[0037] Add 96 parts of solvent, 1 part of dispersant, and 0.3 parts of defoamer to a dispersion tank and stir evenly. Then add 3 parts of graphene powder coated with surface silane and disperse at high speed for 60 minutes. Transfer to a basket nano-dispersing mill and disperse and grind at high speed for 2 hours. Finally, disperse by ultrasonication for 30 minutes to obtain a particle size of less than 100 nm, thus preparing a 3% graphene dispersion.

[0038] S13. Mixing and stirring to prepare component A: In this embodiment, component A, by mass percentage, includes: 20 parts polyaspartic acid ester F524, 20 parts polyaspartic acid ester F520, 10 parts polyaspartic acid ester D2925, 15 parts titanium nanopolymer, 20 parts graphene dispersion, 0.5 parts dispersant BYK-161, 1.5 parts dispersant BYK-110, 0.3 parts defoamer BYK-A530, 25 parts rutile titanium dioxide R-706, 2 parts high-pigment carbon black FW200, 0.4 parts leveling agent BYK-333, 0.75 parts organobentonite, 0.75 parts fumed SiO2, and 0.4 parts ultraviolet absorber 1130.

[0039] Add 20 parts of polyaspartic acid ester F524, 10 parts of polyaspartic acid ester F520, and 10 parts of polyaspartic acid ester D2925 to a dispersion tank. Under medium-speed stirring, add 15 parts of titanium nanopolymer, 20 parts of graphene dispersion, 0.5 parts of dispersant BYK-161, 1.5 parts of dispersant BYK-110, 0.3 parts of defoamer BYK-A530, 25 parts of rutile titanium dioxide R-706, and 2 parts of high-pigment carbon black FW200. Disperse at high speed for 30 minutes, then grind to a fineness of less than 15 μm using a sand mill. Add 0.4 parts of leveling agent BYK-333, 0.75 parts of organobentonite, 0.75 parts of fumed SiO2, and 0.4 parts of UV absorber 1130. Stir until homogeneous to obtain component A.

[0040] Preparation of components S2 and B: In this embodiment, component B, by mass fraction, includes: 60 parts of HDI trimer N3390, 22 parts of elastic curing agent SP-103P, 16 parts of solvent butyl acetate, and 1 part of water-absorbing agent molecular sieve 3A.

[0041] HDI trimer, elastic curing agent, solvent butyl acetate, and water-absorbing agent molecular sieve 3A are added to a mixing tank in sequence according to the proportion. The mixture is stirred at medium speed until homogeneous, and then filtered to obtain component B. Example

[0042] This embodiment provides a method for preparing a nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating, comprising the following steps: Preparation of S1 and A components: S11. Preparation of titanium nanopolymers: Add 50-70 parts of polyaspartic acid ester, 0.2-0.3 parts of silane coupling agent, 1.0-1.5 parts of dispersant, and 15-20 parts of solvent to a mixing tank and stir until homogeneous to prepare a polymer solution. Load the polymer solution and titanium powder into the ball mill jar of a planetary ball mill at a ratio of 75-80:15-25, making the ball-to-material ratio 4:1. Adjust the speed to 600 r / min and ball mill for 6 hours. Then, add an ultrasonic disperser for ultrasonic dispersion for 0.5 hours. Filter, and the particle size is 50 nm-80 nm. Titanium nanopolymers are thus prepared.

[0043] S12, Preparation of graphene dispersion: Graphene powder pretreatment: Weigh 5-10 parts of dried graphene powder, add 90-95 parts of 95% ethanol and 1.5 parts of silane coupling agent mixed solvent, disperse ultrasonically for 40 min, transfer to a three-necked flask with reflux device and stir for 4 h, and vacuum dry at 80℃ to obtain silane-coated graphene.

[0044] Add 96 parts of solvent, 1 part of dispersant, and 0.3 parts of defoamer to a dispersion tank and stir evenly. Then add 3 parts of graphene powder coated with surface silane and disperse at high speed for 60 minutes. Transfer to a basket nano-dispersing mill and disperse and grind at high speed for 2 hours. Finally, disperse by ultrasonication for 30 minutes to obtain a particle size of less than 100 nm, thus preparing a 3% graphene dispersion.

[0045] S13. Mixing and stirring to prepare component A: In this embodiment, component A, by mass percentage, includes: 30 parts polyaspartic acid ester F524, 20 parts polyaspartic acid ester F520, 20 parts polyaspartic acid ester D2925, 20 parts titanium nanopolymer, 10 parts graphene dispersion, 1 part dispersant BYK-161, 1 part dispersant BYK-110, 0.5 parts defoamer BYK-A530, 29 parts rutile titanium dioxide R-706, 1 part high-pigment carbon black FW200, 0.5 parts leveling agent BYK-333, 0.25 parts organobentonite, 0.25 parts fumed SiO2, and 0.3 parts ultraviolet absorber 1130.

[0046] Add 22 parts of polyaspartic acid ester F524, 8 parts of polyaspartic acid ester F520, and 12 parts of polyaspartic acid ester D2925 to a dispersion tank. Under medium-speed stirring, add 20 parts of titanium nanopolymer, 10 parts of graphene dispersion, 1 part of dispersant BYK-161, 1 part of dispersant BYK-110, 0.5 parts of defoamer BYK-A530, 29 parts of rutile titanium dioxide R-706, and 1 part of high-pigment carbon black FW200. Disperse at high speed for 30 minutes, then grind to a fineness of less than 15 μm using a sand mill. Add 0.5 parts of leveling agent BYK-333, 0.5 parts of organobentonite, 0.5 parts of fumed SiO2, and 0.3 parts of UV absorber 1130. Stir until homogeneous to obtain component A.

[0047] Preparation of components S2 and B: Component B comprises the following components by mass: 70 parts HDI trimer, 30 parts elastic curing agent, 20 parts solvent butyl acetate, and 4 parts water-absorbing agent molecular sieve 3A.

[0048] HDI trimer, elastic curing agent, solvent, and water absorbent are added to a mixing tank in sequence according to the proportion. The mixture is stirred at medium speed until homogeneous, and then filtered to obtain component B.

[0049] This patent application uses polyaspartic acid ester as the main resin, titanium nanopolymer and graphene as modifiers, rutile titanium dioxide and high-pigment carbon black as pigments, and various functional additives to prepare a high-solids-content component A; and HDI trimer as the main component, elastic curing agent as an auxiliary component, combined with water absorbent and solvent to form component B. Component A:Component B = 2:1 (mass ratio) is mixed evenly and then sprayed.

[0050] Testing revealed that the titanium nanoparticle / graphene modified polyaspartic acid ester polyurea heavy-duty anti-corrosion coating met the following performance indicators:

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating, characterized in that: Based on parts by mass, it includes the following components: Component A consists of 2 portions, and component B consists of 1 portion. Component A comprises, by mass parts: 40-70 parts of composite polyaspartic acid ester, 10-20 parts of titanium nanopolymer, 10-20 parts of graphene dispersion, 25-35 parts of rutile titanium dioxide, 1-3 parts of carbon black, 1-2 parts of dispersant, 0.2-0.5 parts of defoamer, 0.3-0.5 parts of leveling agent, 0.5-1.5 parts of thixotropic agent, and 0.3-0.5 parts of ultraviolet absorber; Component B comprises the following components by mass: 50-70 parts of HDI trimer, 10-30 parts of elastic curing agent, 10-20 parts of solvent, and 1-4 parts of water-absorbing agent.

2. The nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating as described in claim 1, characterized in that, The composite polyaspartic ester includes one or more of polyaspartic ester F524, polyaspartic ester F520, and polyaspartic ester D2925, with BYK-161 as the dispersant, BYK-A530 as the defoamer, BYK-333 as the leveling agent, SP-103P as the elastic curing agent, butyl acetate as the solvent, molecular sieve 3A as the water absorbent, and organic bentonite as the thixotropic agent.

3. The nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating as described in claim 1, characterized in that, Components A and B should be stored separately and mixed evenly according to the specified ratio before spraying.

4. The preparation method of the nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating according to any one of claims 1-3, characterized in that, Includes the following steps: Preparation of S1 and A components: Preparation of S11 titanium nanopolymers: The composite polyaspartic acid ester is added to a mixing tank with a certain proportion of silane coupling agent, dispersant and solvent, and stirred to dissolve evenly to prepare a polymer solution; the polymer solution and metallic titanium powder are loaded into the ball milling jar of a planetary ball mill in a certain proportion and ball milled, then ultrasonically dispersed by an ultrasonic disperser, filtered, and titanium nanopolymer is prepared. S12, Preparation of graphene dispersion: Silane-coated graphene is obtained by pretreating graphene powder. A certain proportion of solvent, dispersant, and defoamer are added to a dispersion tank and stirred evenly. Then, the surface silane-coated graphene powder is added, dispersed at high speed, and then transferred to a basket nano-dispersing mill for dispersion and grinding. Finally, it is dispersed by ultrasonication to prepare a graphene dispersion. S13. Preparation of Component A by mixing and stirring: Add the composite polyaspartic ester to the dispersion tank in proportion, add the appropriate proportion of titanium nanopolymer, graphene dispersion, dispersant, defoamer, pigments and fillers under medium speed stirring, disperse at high speed for 30 minutes, then grind to a fineness of less than 15 μm using a sand mill, add leveling agent, thixotropic agent, and ultraviolet absorber, stir evenly to obtain Component A. Preparation of components S2 and B: According to the specified proportions, HDI trimer, elastic curing agent, solvent, and water absorbent are added sequentially to a mixing tank and mixed evenly at medium speed. After filtration, component B is obtained.

5. The preparation method of the nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating as described in claim 4, characterized in that, In S11, by mass fraction, 50-70 parts of composite polyaspartic acid ester, 0.2-0.3 parts of silane coupling agent, 1.0-1.5 parts of dispersant, and 15-20 parts of solvent are added sequentially to a mixing tank and stirred until uniformly dissolved to prepare a polymer solution. The polymer solution and titanium powder are loaded into the ball mill jar of a planetary ball mill at a ratio of 75-80:15-25, so that the ball-to-material ratio is 4:

1. The speed is adjusted to 600 r / min, and the milling is carried out for 6 hours. Then, an ultrasonic disperser is added for ultrasonic dispersion for 0.5 hours. After filtration, the particle size is 50nm-80nm, thus preparing titanium nanopolymer.

6. The preparation method of the nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating as described in claim 4, characterized in that, In S12, graphene powder is pretreated to obtain silane-coated graphene. 96 parts of solvent, 1 part of dispersant, and 0.3 parts of defoamer are added to a dispersion tank and stirred evenly. Then, 3 parts of surface silane-coated graphene powder are added and dispersed at high speed for 60 minutes. The mixture is then transferred to a basket nano-dispersing mill and dispersed and ground at high speed for 2 hours. Finally, it is ultrasonically dispersed for 30 minutes to obtain a particle size of less than 100 nm, thus preparing a 3% graphene dispersion.

7. The preparation method of the nano-modified polyaspartic acid ester heavy-duty anti-corrosion coating as described in claim 6, characterized in that, In S12, graphene powder pretreatment: Weigh 5-10 parts of dried graphene powder, add 90-95 parts of 95% ethanol and 1.5 parts of silane coupling agent mixed solvent, disperse ultrasonically for 40 min, transfer to a three-necked flask with reflux device and stir for 4 h, and vacuum dry at 80℃ to obtain silane-coated graphene.

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