High-barrier heat-resistant acrylic resin composite coating and preparation method thereof
By combining in-situ copolymerized functionalized layered inorganic nanofillers with microcapsules and conductive clusters, an interpenetrating network coating is constructed, which solves the problems of performance degradation of traditional coatings at high temperatures and the complexity of multifunctional coating preparation. This results in a multifunctional coating with high barrier properties, heat resistance, self-healing, antibacterial and antistatic properties, with a simple and efficient process.
Patent Information
- Application Number
- CN202511521319.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-23
- Publication Date
- 2026-02-17
AI Technical Summary
Traditional acrylic resin coatings are prone to reduced cross-linking degree and softening and delamination of the substrate under high temperature conditions. Moreover, single-function coatings are difficult to meet the needs of multi-scenario applications. Existing multi-functional coating preparation processes are complex and their performance is difficult to optimize.
An interpenetrating network is constructed by in-situ copolymerization of functionalized layered inorganic nanofillers, and microcapsules and conductive clusters are introduced to achieve a multifunctional coating with heat resistance, self-healing, antibacterial and antistatic properties. This is combined with low-temperature gas atomization curing and UV/thermal dual curing processes.
It significantly improves the barrier properties and thermal stability of the coating, achieves self-healing function, has long-lasting antibacterial ability and good conductivity, and the process is mild and environmentally friendly with high production efficiency.
Smart Images
Figure CN121537844A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of polymer materials and polymer chemistry, and specifically relates to a high-barrier, heat-resistant acrylic resin composite coating and its preparation method. Background Technology
[0002] In recent years, with the increasing demands for lightweight, high-temperature sealing, and corrosion resistance in electronic devices, small sensors, automotive engines, and chemical equipment, higher requirements have been placed on the comprehensive performance of surface coatings. Traditional acrylic resin coatings, due to their good film-forming properties, strong adhesion, and ease of application, are widely used in building decoration, pipeline corrosion protection, and food packaging. However, under high-temperature environments, they are prone to reduced cross-linking, matrix softening, and even delamination and cracking, leading to a rapid decline in barrier and mechanical properties. To improve barrier properties, the industry often physically blends nano-layered silicates, nano-clays, or alumina into acrylic resins to extend the diffusion paths of gases and water vapor. However, this physical blending method is prone to problems such as filler agglomeration, poor interfacial bonding, increased coating brittleness, and shortened service life. On the other hand, to improve heat resistance, existing technologies often use high-temperature cross-linking agents or introduce high-temperature monomers containing aromatic structures to chemically cross-link with the acrylic matrix. While this can improve thermal stability to some extent, it often comes with drawbacks such as harsh preparation conditions, long curing times, increased system brittleness, and increased process costs. Furthermore, with the increasing demand for anti-corrosion, antibacterial, self-healing, and antistatic functions, single-function coatings are no longer sufficient to meet the needs of modern multi-scenario applications. Existing multi-functional coatings are usually achieved through multi-layer structures or the addition of multiple functional additives, resulting in complex preparation processes, compatibility mismatches between layers, and difficulties in simultaneously optimizing overall performance. Summary of the Invention
[0003] To address the shortcomings mentioned in the background art, the present invention aims to provide a high-barrier, heat-resistant acrylic resin composite coating and its preparation method. By constructing an interpenetrating network through in-situ copolymerization of functionalized layered inorganic nanofillers, and introducing microcapsules and conductive clusters into the system, the coating achieves multifunctional integration of heat resistance, self-healing, antibacterial and antistatic properties.
[0004] The objective of this invention can be achieved through the following technical solutions: A high-barrier, heat-resistant acrylic resin composite coating comprises the following raw materials in parts by weight: 80-120 parts of acrylic emulsion, 3-10 parts of functionalized layered inorganic nanofiller, 10-20 parts of comonomer, 1-5 parts of microcapsule component, 0.5-2 parts of conductive cluster component, 0.1-1 part of photoinitiator, and 0.1-0.5 parts of crosslinking agent; The components are dispersed, copolymerized, and cured in situ in an acrylic emulsion.
[0005] More preferably, the preparation method of functionalized layered inorganic nanofillers specifically includes the following steps: S101. Add natural layered silicate and diethyl phosphate to a mixed solvent of ethanol and water (volume ratio 1:1); S102. Under nitrogen protection, the reaction is carried out at 60°C with triethanolamine added as a catalyst; S103. After the reaction is complete, remove the supernatant by centrifugation and wash repeatedly with deionized water until neutral; S104. The precipitate is dried and then heat-treated for 2 hours to obtain a functionalized layered inorganic nanofiller with phosphate ester groups grafted onto its surface.
[0006] More preferably, the comonomer is a mixture of butyl acrylate and hydroxyethyl acrylate, and their volume ratio is 60-80:20-40. More preferably, the method for preparing the microcapsule components specifically includes the following steps: S201. Prepare a mixed solution of Zn(NO3)2·6H2O, methyl methacrylate and acrylamide, and add polyvinyl alcohol emulsifier. Pre-emulsify the solution by high-speed stirring to form a stable emulsion. S202. Under nitrogen protection, slowly add ammonium persulfate initiator and heat the system to the polymerization temperature, continuously stirring to complete the polymerization reaction; S203. After the reaction is complete, the reaction solution is cooled to room temperature and the microcapsule precipitate is recovered by centrifugation. S204. The obtained precipitate is washed multiple times to remove unreacted monomers and impurities, and then dried in an oven to constant weight to obtain the microcapsule component.
[0007] More preferably, the conductive cluster component is a composite microparticle obtained by co-heating phenolic resin and graphene oxide at a mass ratio of 3:1.
[0008] More preferably, the photoinitiator is 2-hydroxy-2-methyl-1-phenylpropanone, and the crosslinking agent is allyltrimethoxysilane; More preferably, the acrylate emulsion is an aqueous emulsion with a solid content of 40% to 60%.
[0009] A method for preparing a high-barrier, heat-resistant acrylic resin composite coating includes the following steps: S1. Natural layered silicates, diethyl phosphate, and triethanolamine are mixed and reacted to obtain functionalized silicate nanosheets; S2. Functionalized nanosheets are mixed and dispersed with acrylate emulsion, butyl acrylate, hydroxyethyl acrylate, photoinitiator and crosslinking agent to form a dispersion for coatings; S3. In a nitrogen atmosphere, the coating dispersion and the initiator react together to complete the emulsion polymerization; S4. The coating dispersion is applied to the substrate surface by spraying, followed by sequential atomization curing, UV irradiation and heat curing treatments to obtain a high-barrier heat-resistant acrylic resin composite coating.
[0010] More preferably, the coating contains a Diels-Alder reversible crosslinking precursor, which can achieve self-healing of microcracks under high temperature.
[0011] More preferably, after the film-forming and curing steps, a thermal activation step is added to activate the Diels-Alder self-healing function through heat treatment and repair micro-damage to the coating.
[0012] The beneficial effects of this invention are: The composite coating prepared by this invention forms a highly ordered interpenetrating network structure at the molecular and nanoscale. The nanofiller is deeply bonded to the matrix through covalent phosphate bonds, which not only significantly extends the permeation path of gases and water vapor, achieving excellent barrier performance, but also improves the thermal stability of the coating under high-temperature environments. The coating maintains structural integrity under continuous high temperatures, preventing the matrix from softening or delaminating. The strategy of in-situ assembly of microcapsules and conductive clusters enables the coating to self-heal through the Diels-Alder reversible cross-linking mechanism when mechanical damage or microcracks occur, extending its service life. Simultaneously, zinc ion microcapsules endow the coating with long-lasting antibacterial capabilities, effectively inhibiting the growth of surface microorganisms; the dispersion of conductive carbon clusters gives the coating good conductivity and antistatic properties, meeting the protection requirements of electronic devices. The combination of low-temperature gas atomization curing and UV / thermal dual curing processes is mild and environmentally friendly, with high production efficiency, rapid coating film formation, and strong adhesion. Attached Figure Description
[0013] The invention will now be further described with reference to the accompanying drawings.
[0014] Figure 1 A bar chart comparing the oxygen and water vapor transmission rates of samples prepared in Examples 1-3 and Comparative Examples 1-2; Figure 2 The self-healing closure rate curve of the sample prepared for this invention in 0-12h; Figure 3 A bar chart comparing the antibacterial rates of the coatings prepared according to this invention. Detailed Implementation
[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments 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 skilled in the art without creative effort are within the scope of protection of the present invention.
[0016] Example 1 I. Preparation of Functionalized Layered Inorganic Nanofillers Weigh 10.00 g of natural layered silicate powder, 2.00 g of diethyl phosphate, and 0.50 g of triethanolamine and add them to 100 mL of ethanol / water (1:1, volume ratio) solvent. Stir until uniformly suspended. Purge the reaction vessel with nitrogen for protection, heat to 60 °C, and maintain magnetic stirring (approximately 400 rpm) for 4 hours. After the reaction, allow the system to cool to room temperature and centrifuge at 8000 rpm for 10 minutes to separate the precipitate. Discard the supernatant. Wash the precipitate three times with 100 mL of deionized water until the pH of the washing solution is approximately 7. Finally, remove residual water by centrifugation or vacuum filtration. Place the washed precipitate in an 80 °C vacuum oven and dry for 12 hours. Then, transfer it to an air-conditioned oven at 120 °C for 2 hours to further promote the cross-linking and strengthening of phosphate ester bonds. After cooling to room temperature, gently grind the precipitate in a mortar to obtain a uniform phosphate-modified layered functionalized layered inorganic nanofiller.
[0017] II. Preparation of Microcapsule Components Weigh 10.0 g of zinc nitrate hexahydrate (Zn(NO3)2·6H2O), 10.0 g of methyl methacrylate, and 10.0 g of acrylamide into a 250 mL reaction flask. Add 90 g of deionized water to the flask and stir until dissolved. Add 2.0 g of polyvinyl alcohol and pre-emulsify using a mechanical stirrer at 400 rpm for 10 minutes until a milky white homogeneous emulsion is formed. Purge with nitrogen at 20 mL / min, place in an oil bath, and heat to 70 °C with stirring at 400 rpm. After the temperature stabilizes, slowly add 1.0 g of ammonium persulfate, completing the entire addition process within 5 minutes. Maintain the reaction at 70 °C, under nitrogen, and with stirring at 400 rpm for 2 hours. After the reaction is complete, allow the system to cool naturally to room temperature; centrifuge at 8000 rpm for 10 minutes, discard the supernatant, and collect the microcapsule precipitate. The precipitate was subjected to a three-wash treatment with 100 mL of deionized water, centrifuged at 8000 rpm after each wash until the pH of the washing solution returned to neutral. The washed microcapsule precipitate was then dried in a vacuum oven at 60 ℃ for 12 hours to obtain a white powdery microcapsule component.
[0018] III. Preparation of High-Barrier Heat-Resistant Acrylic Resin Composite Coating The high-barrier, heat-resistant acrylic resin composite coating comprises the following raw materials in parts by weight: 80 parts acrylic emulsion, 3 parts functionalized layered inorganic nanofiller, 10 parts comonomer, 1 part microcapsule component, 0.5 parts conductive cluster component, 0.1 parts photoinitiator, and 0.1 parts crosslinking agent. The preparation steps are as follows: Pour 80 g of 50% solids content aqueous acrylic emulsion into a 500 mL stirred tank, start mechanical stirring (400 rpm), and successively add 3.0 g of functionalized layered inorganic nanofiller, 1.0 g of microcapsules, and 0.5 g of conductive cluster solids. Treat with an ultrasonic probe (150 W power) for 10 minutes until uniformly dispersed; add 10.0 g of butyl acrylate, 5.0 g of hydroxyethyl acrylate, 0.1 g of 2-hydroxy-2-methyl-1-phenylpropanone, and 0.1 g of allyltrimethoxysilane to the dispersion system, and maintain stirring at 400 rpm for 5 minutes; install a nitrogen inlet pipe on the stirred tank, introduce nitrogen (flow rate 20 mL / min), heat to 70 ℃, and after the temperature stabilizes, slowly add 0.5 g of ammonium persulfate as an initiator, and continue stirring at 400 rpm for 2 hours; pour the polymerized coating dispersion into a sprayer, spray it onto the surface of an acrylic sheet, and place it at 60°C. The coating is cured in a 180°C atomization curing chamber for 5 minutes, followed by UV curing (wavelength 365 nm, irradiation for 10 seconds), and finally heat-treated in a 180°C oven for 30 minutes to obtain the high-barrier heat-resistant acrylic resin composite coating.
[0019] Example 2 The preparation methods for the functionalized layered inorganic nanofillers and microcapsule components are the same as in Example 1.
[0020] The preparation method of the high-barrier, heat-resistant acrylic resin composite coating is as follows: The high-barrier, heat-resistant acrylic resin composite coating comprises the following raw materials in parts by weight: 120 parts of acrylic emulsion, 10 parts of functionalized layered inorganic nanofiller, 20 parts of comonomer, 5 parts of microcapsule component, 2 parts of conductive cluster component, 1 part of photoinitiator, and 0.5 parts of crosslinking agent. The preparation steps for the high-barrier, heat-resistant acrylic resin composite coating are the same as in Example 1.
[0021] Example 3 The preparation methods for the functionalized layered inorganic nanofillers and microcapsule components are the same as in Example 1.
[0022] The preparation method of the high-barrier, heat-resistant acrylic resin composite coating is as follows: The high-barrier, heat-resistant acrylic resin composite coating comprises the following raw materials in parts by weight: 100 parts acrylic emulsion, 6.5 parts functionalized layered inorganic nanofiller, 15 parts comonomer, 3 parts microcapsule component, 1.25 parts conductive cluster component, 0.55 parts photoinitiator, and 0.3 parts crosslinking agent. The preparation steps for the high-barrier, heat-resistant acrylic resin composite coating are the same as in Example 1.
[0023] Comparative Example 1 The preparation method of the functionalized layered inorganic nanofiller is the same as that in Example 1.
[0024] The preparation method of the high-barrier, heat-resistant acrylic resin composite coating is as follows: The high-barrier, heat-resistant acrylic resin composite coating comprises the following raw materials in parts by weight: 100 parts acrylic emulsion, 6.5 parts functionalized layered inorganic nanofiller, 15 parts comonomer, 1.25 parts conductive cluster component, 0.55 parts photoinitiator, and 0.3 parts crosslinking agent. The preparation steps of the high-barrier heat-resistant acrylic resin composite coating are the same as those in Example 1, except that no microcapsule components are added during the dispersion preparation.
[0025] Comparative Example 2 The preparation method of the microcapsule components is the same as in Example 1.
[0026] The preparation method of the high-barrier, heat-resistant acrylic resin composite coating is as follows: The high-barrier, heat-resistant acrylic resin composite coating comprises the following raw materials in parts by weight: 100 parts acrylic emulsion, 15 parts comonomer, 3 parts microcapsule component, 1.25 parts conductive cluster component, 0.55 parts photoinitiator, and 0.3 parts crosslinking agent; The preparation steps of the high-barrier heat-resistant acrylic resin composite coating are the same as those in Example 1, except that no functionalized layered inorganic nanofiller is added during dispersion preparation.
[0027] Performance testing 1. Oxygen permeability test The tests were conducted according to ASTM D3985. Coated samples (50 cm²) were cut and fixed onto a dedicated test chamber. 100% pure oxygen was introduced into the upper chamber, and nitrogen was introduced into the lower chamber as the carrier gas, ensuring a pressure difference of 1 atm between the two chambers. The test temperature was controlled at 23 ± 1 ℃, and the relative humidity was 0% (dry conditions). Formal measurements began 30 minutes after aeration. Oxygen concentration changes were continuously recorded using an oxygen sensor until the permeation rate reached a steady state. The test data were taken as the average value during the steady-state period, expressed as cc / (m²·day) of the oxygen permeability of the sample. Each sample was tested at least three times, and the results are shown in Table 1 below.
[0028] Table 1 Oxygen Transmission Rate As shown in Table 1, the results of Examples 1–3 indicate that the oxygen permeability of the samples significantly decreased with increasing nanofiller dosage and optimized copolymer network structure. Example 3, in particular, achieved the lowest OTR value by significantly extending the diffusion channels of gas molecules through the high specific surface area interpenetrating network formed by the in-situ copolymerization of phosphate-modified layered silicate in an acrylic matrix. Simultaneously, although the multifunctional microcapsules and self-healing precursors are not direct barrier factors, they can repair cracks and maintain network integrity at the microscopic level, further enhancing the barrier performance. Comparative Examples 1 and 2, lacking key components, showed a significant degradation in barrier effect, demonstrating the core value of the synergistic effect of the nanofiller-resin copolymer network and multifunctional components in this invention.
[0029] 2. Water vapor transmission rate test The test was conducted according to ASTM E96 (Water Vapor Transmission Cup Method): Coated samples were cut into 50 mm diameter circular pieces and firmly adhered to the mouth of the test cup, with the coated surface facing the inner saturated saline solution (containing magnesium sulfate, maintained at approximately 33% RH). The cup was placed in a constant-temperature chamber at 38 ± 1 °C, with dry air outside, and kept stationary. The mass change of the test cup was measured every 24 hours, for at least five consecutive measurements, until a linear trend in mass change was observed. The water vapor transmission rate (WVTR) was calculated based on the mass loss rate and coating area, in g / (m²·day). Each sample was tested three times, and the results are shown in Table 2 below.
[0030] Table 2 Water vapor transmission rate As shown in Table 2, in Examples 1–3, the water vapor barrier performance of the coatings was significantly enhanced with the optimization of the nanofiller content and interpenetrating network structure. Example 3, benefiting from the high specific surface area network formed by the in-situ copolymerization of phosphate-modified layered silicates, had its water vapor diffusion channels maximized, resulting in the lowest WVTR value. Simultaneously, the microcapsule structure dispersed in the emulsion provided additional blocking at microcracks, further inhibiting water penetration. In contrast, Comparative Examples 1 and 2, lacking microcapsules or self-healing precursors, exhibited decreased network integrity and crack closure ability, leading to degraded barrier performance.
[0031] 3. Self-healing performance test According to the self-healing mechanism design of the coating of this invention, the scratch closure rate was evaluated using the following test method: The coating sample was cut into 20 mm × 20 mm squares, and straight scratches with a penetration depth equivalent to the coating thickness were made on the surface using a 2H pencil. The scratched samples were placed in an 80 ℃ constant temperature chamber for 4 h, then removed and allowed to cool naturally to room temperature. The changes in scratch width and depth were measured using a scratch depth gauge. The scratch closure rate was calculated using the formula: (initial scratch width – healed scratch width) / initial scratch width × 100%. Each sample was tested three times, and the average value was taken. The results are shown in Table 3 below.
[0032] Table 3 Self-healing performance results As shown in Table 3, the self-healing closure rates of Examples 1–3 were significantly higher than those of the comparative samples. Furthermore, with optimization of the reversible crosslinking precursor content and interpenetrating network structure, the closure rate increased from 45% to 78%. Example 3 benefited from the rapid breakage and reorganization of the Diels-Alder reversible crosslinking nodes under high-temperature conditions, resulting in complete closure of the microcracks. In contrast, Comparative Examples 1 and 2, lacking self-healing precursors or key microstructures, had crack closure rates of only 30% and 35%, respectively, failing to restore network integrity. Moreover, the deep copolymerization and high specific surface area of the functionalized nanofillers enhanced the crosslinking density of the matrix, effectively releasing and reconstructing the network tension during self-healing. The microcapsules also provided physical barriers at the crack sites, assisting in the localized focusing of the self-healing reaction.
[0033] 4. Antibacterial performance test Tests were performed according to JIS Z 2801: Escherichia coli and Staphylococcus aureus were cultured separately to the logarithmic growth phase, and the bacterial suspensions were diluted to approximately 1 × 10⁻⁶. 5 CFU / mL. Coated plates (20 mm × 20 mm) were sterilized with UV light and placed in sterile petri dishes. 50 μL of bacterial suspension was inoculated in the center of each plate and covered with a sterile polyethylene film. The plates were incubated at 37 ℃ for 24 h. After incubation, bacteria were washed off the surface of the plates with sterile buffer. The eluent was appropriately diluted and spread onto nutrient agar plates. After incubation at 37 ℃ for 24 h, colony forming units (CFU) were counted. The colony inhibition rate was calculated by comparing the colony counts of the uncoated plates (control group) and the test group. Each sample was repeated three times, and the results are shown in Table 4 below.
[0034] Table 4 Antibacterial rate results Table 4 shows that the antibacterial test results of Examples 1–3 demonstrate the effect of long-term zinc ion release from microcapsules on the antibacterial performance of the coating. In Example 3, the microcapsule content was moderate and uniformly dispersed, not only forming a local high-concentration area for continuous zinc ion release on the coating surface, but also utilizing the synergistic effect of the nanofiller network and cross-linked matrix to stabilize and fix the position and morphology of the microcapsules, ultimately achieving near-total inhibition rates (98% and 97%) against Escherichia coli and Staphylococcus aureus. Examples 2 and 1 further enhanced the antibacterial effect by increasing the amount of microcapsules and optimizing the self-healing network, respectively, achieving inhibition rates of 96% / 94% and 92% / 90%. In contrast, Comparative Examples 1 and 2, lacking microcapsules, relied solely on the extremely limited antibacterial activity of the matrix itself, with inhibition rates ranging from only 40% to 45%, far lower than the examples.
[0035] 5. Surface resistivity test The surface resistivity of the coating was determined according to ASTM D257 standard. A coating sample (100 mm × 100 mm) was laid flat at 23 ± 2 ℃ and 50 ± 5% RH for 24 h to equilibrate before being tested using a surface resistivity meter (e.g., Keithley 6517B). Two parallel electrodes (10 mm apart, 50 mm effective length) were pressed onto the coating surface, and a DC voltage of 100 V was applied. The stable current value was recorded. Surface resistivity ρ s Calculate using the following formula: Where V is the applied voltage, I is the steady-state current, W is the electrode spacing, and D is the electrode width, the results are shown in Table 5 below.
[0036] Table 5 Surface resistivity test results As shown in Table 5, as the content of conductive clusters gradually increased from 0.5 parts (Example 1) to 1.25 parts (Example 3), the surface resistivity of the coating increased from 10... 9 Ω / □ reduced to 10 8 The steady-state current is on the order of Ω / □, and correspondingly increases from 2×10 -8 A increased to 2×10 -7 A. This is mainly due to the continuous conductive pathways formed by the carbon clusters within the acrylic matrix, allowing electrons to diffuse more easily along the surface rather than accumulate locally. In contrast, Comparative Examples 1 and 2, due to the absence or reduction of conductive clusters, exhibit surface resistivity as high as 10⁻⁶. 11 -10 12 Ω / □ cannot effectively disperse the charge, resulting in extremely poor electrostatic suppression.
[0037] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.
Claims
1. A high-barrier, heat-resistant acrylic resin composite coating, characterized in that, It contains the following raw materials in parts by weight: 80-120 parts of acrylate emulsion, 3-10 parts of functionalized layered inorganic nanofiller, 10-20 parts of comonomer, 1-5 parts of microcapsule component, 0.5-2 parts of conductive cluster component, 0.1-1 part of photoinitiator, and 0.1-0.5 parts of crosslinking agent; The components are dispersed, copolymerized, and cured in situ in an acrylic emulsion.
2. The high-barrier, heat-resistant acrylic resin composite coating according to claim 1, characterized in that, The preparation method of the functionalized layered inorganic nanofiller specifically includes the following steps: S101. Add natural layered silicate and diethyl phosphate to a mixed solvent of ethanol and water (volume ratio 1:1); S102. Under nitrogen protection, the reaction is carried out at 60°C with triethanolamine added as a catalyst; S103. After the reaction is complete, remove the supernatant by centrifugation and wash repeatedly with deionized water until neutral; S104. The precipitate is dried and then heat-treated for 2 hours to obtain a functionalized layered inorganic nanofiller with phosphate ester groups grafted onto its surface.
3. The high-barrier, heat-resistant acrylic resin composite coating according to claim 1, characterized in that, The comonomer is a mixture of butyl acrylate and hydroxyethyl acrylate, with a volume ratio of 60-80:20-40.
4. The high-barrier, heat-resistant acrylic resin composite coating according to claim 1, characterized in that, The preparation method of the microcapsule components specifically includes the following steps: S201. Prepare a mixed solution of Zn(NO3)2·6H2O, methyl methacrylate and acrylamide, and add polyvinyl alcohol emulsifier. Pre-emulsify the solution by high-speed stirring to form a stable emulsion. S202. Under nitrogen protection, slowly add ammonium persulfate initiator and heat the system to the polymerization temperature, continuously stirring to complete the polymerization reaction; S203. After the reaction is complete, the reaction solution is cooled to room temperature and the microcapsule precipitate is recovered by centrifugation. S204. The obtained precipitate is washed multiple times to remove unreacted monomers and impurities, and then dried in an oven to constant weight to obtain the microcapsule component.
5. The high-barrier, heat-resistant acrylic resin composite coating according to claim 1, characterized in that, The conductive cluster component is a composite microparticle obtained by co-heating phenolic resin and graphene oxide at a mass ratio of 3:
1.
6. The high-barrier, heat-resistant acrylic resin composite coating according to claim 1, characterized in that, The photoinitiator is 2-hydroxy-2-methyl-1-phenylpropanone, and the crosslinking agent is allyltrimethoxysilane.
7. The high-barrier, heat-resistant acrylic resin composite coating according to claim 1, characterized in that, The acrylate emulsion is an aqueous emulsion with a solid content of 40% to 60%.
8. A method for preparing a high-barrier, heat-resistant acrylic resin composite coating, wherein the high-barrier, heat-resistant acrylic resin composite coating is as described in any one of claims 1-7, characterized in that... Includes the following steps: S1. Natural layered silicate, diethyl phosphate and triethanolamine are mixed and reacted to obtain functionalized silicate nanosheets; S2. Functionalized nanosheets are mixed and dispersed with acrylate emulsion, butyl acrylate, hydroxyethyl acrylate, photoinitiator and crosslinking agent to form a dispersion for coatings; S3. In a nitrogen atmosphere, the coating dispersion and the initiator react together to complete the emulsion polymerization; S4. The coating dispersion is applied to the substrate surface by spraying, followed by sequential atomization curing, UV irradiation and heat curing treatments to obtain a high-barrier heat-resistant acrylic resin composite coating.
9. The high-barrier, heat-resistant acrylic resin composite coating according to claim 1, characterized in that, The coating contains a Diels-Alder reversible crosslinking precursor, which can achieve self-healing of microcracks under high temperature.
10. The method for preparing the high-barrier, heat-resistant acrylic resin composite coating according to claim 8, characterized in that, After the film formation and curing steps, a thermal activation step is added to activate the Diels-Alder self-healing function through heat treatment and repair micro-damage to the coating.