Capsaicin intercalated chlorite composite filler and application thereof in anticorrosive paint

Abstract

The invention discloses a capsaicin intercalated chlorite composite filler and an application thereof in an anticorrosive coating, and the method mainly comprises the following steps: peeling chlorite, preparing the composite filler from capsaicin intercalated chlorite, and mixing with other auxiliary materials according to a certain ratio to obtain the anticorrosive coating. The composite filler is applied to epoxy resin and other anticorrosive coatings, chlorite lamellas provide a physical barrier, capsaicin is controllably and slowly released from the interlayer, and the coating is endowed with long-acting and intelligent active anticorrosive ability through a'physical shielding-chemical slow release-biological bacteriostasis' triple synergistic mechanism.

Description

Technical Field

[0001] This invention relates to the fields of new materials technology and anti-corrosion coatings, and in particular to a capsaicin-intercalated chlorite composite filler and its application in anti-corrosion coatings. Background Technology

[0002] Metal corrosion is a major global problem, causing enormous economic losses and safety hazards every year. Organic coatings are the most widely used method of metal protection, and their anti-corrosion mechanism mainly relies on the physical barrier effect of the coating and the chemical passivation effect of rust-inhibiting pigments (such as zinc chromate yellow). However, traditional physical barriers are insufficient to completely block the slow penetration of water, oxygen, and corrosive media; more seriously, although highly efficient rust-inhibiting pigments containing heavy metals such as chromium and lead have excellent performance, they pose serious environmental and health risks, and their application is being increasingly restricted by regulations.

[0003] In harsh environments such as marine engineering, underground pipe networks, and water conservancy facilities, microbial corrosion has become a key factor accelerating coating failure and metal degradation. Microorganisms attach to, proliferate, and form biofilms at metal interfaces. Their metabolic activities locally alter pH levels and secrete corrosive substances, thereby drastically accelerating the corrosion process. Existing coatings often use bactericides to inhibit microorganisms, but traditional small-molecule bactericides are prone to rapid loss, have short effective periods, and pose risks of inducing antibiotic resistance and secondary pollution.

[0004] Capsaicin, as a natural bioactive molecule, has been proven to possess highly effective antibacterial and bacteriostatic properties. It can disrupt the cell membrane structure of microorganisms, inhibiting their metabolism and proliferation, thereby curbing microbial corrosion at its source. For example, CN2021105557280 discloses a heavy-duty anti-corrosion water-based coating for marine engineering equipment and its preparation method. The main raw materials of the coating are: epoxy resin, epoxy resin reactive diluent, polyurethane emulsion, zinc powder, titanium dioxide, graphene, copper sulfate, capsaicin, pyrethroids, polytetrafluoroethylene, and barite. However, directly applying capsaicin to coatings presents technical bottlenecks such as easy decomposition, easy dissolution, and short shelf life.

[0005] Chlorite is a natural layered silicate mineral that, theoretically, could serve as an ideal carrier for functional molecules. However, its interlayers are composed of stable, positively charged magnesium hydroxide flakes ([Mg(OH)6]), resulting in a compact structure and a lack of exchangeable cations. This makes it difficult for most guest molecules, especially electrically neutral, large-sized, and rigid organic molecules like capsaicin, to directly intercalate through conventional ion exchange or diffusion. This inherent characteristic significantly limits the application of chlorite as a slow-release carrier in high-end corrosion protection.

[0006] Furthermore, CN103991877A employs inorganic acids (such as sulfuric acid) to acidify chlorite. This process dissolves the interlayer magnesium hydroxide flakes through the strong proton etching effect of the inorganic acid, which can, to some extent, expand the interlayer spacing and improve adsorption performance. However, inorganic acid treatment is essentially a "physical dissolution and layer expansion" process with a simple mechanism. It primarily relies on the rapid dissolution of metal ions through acid-base neutralization reactions. While it can achieve a certain degree of exfoliation, it is difficult to precisely control the surface charge properties and functional group states of the chlorite layers. Specifically, the chlorite layer surface after inorganic acid treatment still lacks the chemical driving force to form stable interactions with other electrically neutral organic molecules (such as capsaicin). The surface charge control ability is weak, failing to provide effective electrostatic induction or hydrogen bonding synergy for subsequent intercalation. This results in low intercalation efficiency, poor load stability, and a tendency to cause partial damage or non-uniform modification of the layer structure, limiting its application potential in molecular-level composite functional materials.

[0007] For this reason, there are currently no precedents, either domestically or internationally, of intercalating capsaicin molecules into chlorite layers to construct composite fillers that combine physical barrier and slow-release functions, and then applying them to high-performance anti-corrosion coatings. Therefore, in order to achieve the synergistic physical shielding and long-lasting biological antibacterial function of coatings, it is of great significance to explore new ideas for high-performance anti-corrosion coatings. Summary of the Invention

[0008] In view of the shortcomings of the prior art, the purpose of this invention is to provide a novel composite filler for capsaicin intercalation in chlorite. Another object of the present invention is the application of the novel composite filler provided herein in high-performance anti-corrosion coatings.

[0009] The novel composite filler for capsaicin-intercalated chlorite in this application is specifically achieved through the following technical solution: A method for preparing a capsaicin-intercalated chlorite composite filler includes the following steps: (1) Chlorite exfoliation: After grinding chlorite mineral into powder, the powder is dispersed in organic acid at a solid-liquid mass ratio of 1:10 to 1:20. After stirring and reacting in a water bath, the solid product is collected by solid-liquid separation. The solid product is repeatedly washed with deionized water until the supernatant is neutral. The washed sample is then dried to complete the chlorite exfoliation. In this process, the selective complexation and removal of magnesium ions between chlorite layers by organic acid ions is utilized, thereby destroying the magnesium hydroxide lamellae structure and realizing the transformation of the charge properties of the lamellae from positive to negative or neutral.

[0010] (2) Capsaicin-intercalated chlorite: Capsaicin was dissolved in an organic solvent, and then exfoliated chlorite was dispersed in the above solution. The mixture was ultrasonically treated under heating conditions. After the reaction was completed, the solid product was collected by solid-liquid separation, washed with the same solvent, dried, and ground to obtain the capsaicin-intercalated chlorite composite filler. In this process, molecular induction was achieved by the hydrogen bonding between the exposed hydroxyl groups on the surface of the exfoliated chlorite layer and the polar functional groups of the capsaicin molecules, and the ultrasonic treatment provided the kinetic drive, so that the capsaicin molecules could be inserted into and stably exist in the interlayer domain of the chlorite.

[0011] Furthermore, the organic acid in step (1) is either oxalic acid or citric acid, with a concentration of 1 mol / L. The organic acid treatment alters the surface charge properties of the chlorite lamellae, providing an electrostatic adsorption intercalation driving force for electrically neutral capsaicin molecules.

[0012] Furthermore, the organic solvent is one of methanol, ethanol, and acetone.

[0013] Further, in step (1), the water bath is heated and stirred at a temperature of 60-80°C, and the stirring reaction is continued for 6-24 hours.

[0014] Further, in step (1), the drying process is carried out at a temperature of 35~60℃.

[0015] Furthermore, in step (2), the mass ratio of capsaicin to exfoliated chlorite is 3~6:1, and the mass ratio of the total mass of capsaicin and exfoliated chlorite to the mass of organic solvent is 1:10~1:20.

[0016] Furthermore, the heating conditions in step (2) are as follows: the temperature is 40~60℃ and the ultrasonic treatment time is 6~24 h.

[0017] Another object of the present invention is the application of the novel composite filler provided herein in high-performance anti-corrosion coatings.

[0018] Specifically, this is achieved through the following technical solutions: A novel anti-corrosion coating prepared with capsaicin-intercalated chlorite composite filler is obtained by uniformly mixing component A containing capsaicin-intercalated chlorite composite filler with component B at a mass ratio of 4–12:1. The capsaicin-intercalated chlorite composite filler exerts its anti-corrosion effect in the coating through the following mechanisms: the chlorite lamellae provide a physical shielding effect; and the interlayer capsaicin is released in a controlled manner according to the penetration of the corrosive medium, exerting both chemical antibacterial and biological antimicrobial corrosion functions.

[0019] Further, component A is prepared by adding epoxy resin, capsaicin-intercalated chlorite composite filler, auxiliary filler, solvent, leveling agent, dispersant, defoamer, and silane coupling agent into a mixing tank, stirring is started and mixed at a speed of 500-800 r / min. After uniform mixing, the mixture is ground in a grinding mill until the particle size is 50-60 μm. The resulting epoxy resin slurry is component A.

[0020] Furthermore, the content of the capsaicin-intercalated chlorite composite filler is 1-10% of the total weight of component A.

[0021] Furthermore, the epoxy resin is one of bisphenol A type epoxy resin, phenolic epoxy resin, or organosilicon epoxy resin, and accounts for 30-45% of the total weight of component A; Furthermore, the solvent in component A is either butyl acetate or n-butanol, and its content is 10-25% of the total weight of component A; Furthermore, the auxiliary filler is titanium dioxide and mica powder, with the titanium dioxide content being 1-5% of the total weight of component A and the mica powder content being 1-5% of the total weight of component A; Further, the leveling agent is one of BYK-333, BYK-371, BYK-390, and BYK-410, and its content is 0.1% to 3% of the total weight of component A; Furthermore, the dispersant is one of sodium dodecylbenzenesulfonate and sodium dodecyl sulfate, and its content is 1-3% of the total weight of component A; Furthermore, the defoamer is either tributyl phosphate or dimethyl silicone oil, and its content is 0.1-1.0% of the total weight of component A; Furthermore, the silane coupling agent is one of KH-550, KH-570, and KH-590, and its content is 0.1 to 3.0% of the total weight of component A.

[0022] Furthermore, component B is obtained by uniformly mixing isophorone diamine, dibutyl phthalate, and n-butanol.

[0023] Invention principle: The mechanism of action of the capsaicin intercalated chlorite composite filler provided by this invention in anti-corrosion coatings is a triple synergistic anti-corrosion mechanism of "physical-chemical-biological", the core of which lies in the ingenious combination and functional complementarity of chlorite host and capsaicin guest.

[0024] This application achieves a reversal of the charge properties of the chlorite layers from positive to negative by selectively complexing and exfoliating magnesium hydroxide flakes between the chlorite layers with organic acids, thus creating a crucial electrostatic adsorption driving force and intercalation space for capsaicin molecules. Furthermore, it utilizes the polar functional groups of capsaicin molecules and the hydroxyl groups on the surface of the activated chlorite layers to construct a hydrogen bond network, achieving molecular-level induction and oriented intercalation. Finally, it employs ultrasonic cavitation to provide kinetic drive, ultimately achieving efficient and stable loading of capsaicin between the chlorite layers.

[0025] First, chlorite is a natural nanoscale sheet material. Its two-dimensional sheet structure can be oriented parallel to the substrate in a coating system, forming a dense physical barrier. Corrosive media (water, oxygen, chloride ions, etc.) must bypass these sheets in the coating and diffuse along a tortuous path, greatly extending the penetration path and thus significantly delaying the time it takes for the media to reach the metal substrate, improving the coating's isolation and protective performance. On the one hand, capsaicin is stably intercalated in the interlayer domains of chlorite, avoiding rapid dissolution and loss of capsaicin compared to traditional direct blending. When corrosive media (especially moisture) slowly penetrate into the chlorite sheets, it triggers the controlled and slow release of capsaicin from the interlayer. This "on-demand release" mechanism ensures the long-term bactericidal and antiseptic effect. On the other hand, the slowly released capsaicin molecules are a highly efficient natural antibacterial and bacteriostatic agent. It can effectively penetrate and destroy the cell membranes of bacteria, fungi, and other microorganisms attached to the coating surface or metal interface, inhibiting their metabolism and proliferation, thereby fundamentally preventing microbial corrosion and eliminating coating degradation and metal corrosion caused by microbial activity. Furthermore, the layered structure of chlorite provides a sealed and stable protective environment for capsaicin, which is sensitive to light and heat, reducing its decomposition and failure during processing and use, and extending its functional lifespan.

[0026] Beneficial effects Compared with existing technologies, the core advantage of this invention lies in its unique intercalation process, which combines natural capsaicin and chlorite at the molecular level, creating a new triple synergistic anti-corrosion mechanism of "physical shielding, chemical slow release, and biological antibacterial". This not only completely eliminates the environmental toxicity of traditional heavy metal pigments and overcomes the problem of microbial corrosion, but also realizes the intelligentization of functional fillers. Capsaicin can be intelligently released according to the intrusion of corrosive media, thus providing comprehensive and long-lasting protection while also having the advantages of being environmentally friendly, cost-controllable, and having stable performance. This has promoted a major upgrade of anti-corrosion coatings from passive protection to active intelligent protection. The anti-corrosion coating prepared by this invention has good anti-corrosion performance and an antibacterial time of more than 3000 hours. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be described in detail below with reference to several examples. 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.

[0028] Example 1 A method for preparing an anti-corrosion coating containing capsaicin-intercalated chlorite composite filler includes the following steps: (1) Chlorite exfoliation: Chlorite mineral is ground into powder and passed through a 200-mesh sieve. The powder is dispersed in oxalic acid with a concentration of 1 mol / L at a solid-liquid mass ratio of 1:10. After stirring continuously for 6 h in a water bath at 60℃, the solid product is collected by solid-liquid separation. The solid product is washed repeatedly with deionized water until the supernatant is neutral. The washed sample is dried at 35℃ to complete the chlorite exfoliation.

[0029] (2) Capsaicin-intercalated chlorite: Capsaicin was dissolved in ethanol, and then exfoliated chlorite was dispersed in the above solution. The mass ratio of capsaicin to exfoliated chlorite was 3:1, and the mass ratio of the total mass of capsaicin and exfoliated chlorite to the mass of ethanol was 1:10. The mixture was ultrasonically treated for 6 h at 40°C. After the reaction was completed, the solid product was collected by solid-liquid separation, washed with ethanol, dried and ground to obtain the capsaicin-intercalated chlorite composite filler.

[0030] (3) Preparation of anti-corrosion coating: 40wt% bisphenol A type epoxy resin, 1wt% capsaicin intercalated chlorite composite filler, 3wt% titanium dioxide, 3wt% mica powder, 25wt% butyl acetate, 2wt% leveling agent BYK-333, 1wt% sodium dodecylbenzene sulfonate, 0.5wt% tributyl phosphate, and 0.5wt% silane coupling agent KH-550 are added to a mixing tank and stirred at a speed of 500r / min. After mixing evenly, the mixture is ground in a grinder until the particle size is 50μm. Component A is discharged. Component A is mixed evenly with isophorone diamine at a mass ratio of 4:1 to obtain the new anti-corrosion coating.

[0031] Example 2 A method for preparing an anti-corrosion coating containing capsaicin-intercalated chlorite composite filler includes the following steps: (1) Chlorite exfoliation: Chlorite mineral is ground into powder and passed through a 200-mesh sieve. The powder is dispersed in 1 mol / L citric acid at a solid-liquid mass ratio of 1:20. After stirring continuously for 24 h in a water bath at 80℃, the solid product is collected by solid-liquid separation. The solid product is washed repeatedly with deionized water until the supernatant is neutral. The washed sample is dried at 60℃ to complete the chlorite exfoliation.

[0032] (2) Capsaicin-intercalated chlorite: Capsaicin was dissolved in methanol, and then exfoliated chlorite was dispersed in the above solution. The mass ratio of capsaicin to exfoliated chlorite was 6:1, and the mass ratio of the total mass of capsaicin and exfoliated chlorite to methanol was 1:20. The mixture was ultrasonically treated at 60°C for 24 h. After the reaction was completed, the solid product was collected by solid-liquid separation, washed with methanol, dried and ground to obtain the capsaicin-intercalated chlorite composite filler.

[0033] (3) Preparation of anti-corrosion coating: 45wt% phenolic epoxy resin, 10wt% capsaicin intercalated chlorite composite filler, 5wt% titanium dioxide, 5wt% mica powder, 25wt% solvent n-butanol, 3wt% leveling agent BYK-371, 3wt% dispersant sodium dodecyl sulfate, 1.0wt% defoamer dimethyl silicone oil, and 3.0wt% silane coupling agent KH-570 are added to a mixing tank and stirred at a speed of 800r / min. After mixing evenly, the mixture is ground in a grinder until the particle size is 60 μm. Component A is discharged. Component A is mixed evenly with dibutyl phthalate at a mass ratio of 12:1 to obtain the new anti-corrosion coating.

[0034] Example 3 A method for preparing an anti-corrosion coating containing capsaicin-intercalated chlorite composite filler includes the following steps: (1) Chlorite exfoliation: Chlorite mineral is ground into powder and passed through a 200-mesh sieve. The powder is dispersed in oxalic acid with a concentration of 1 mol / L at a solid-liquid mass ratio of 1:15. After stirring continuously for 15 h in a water bath at 70℃, the solid product is collected by solid-liquid separation. The solid product is washed repeatedly with deionized water until the supernatant is neutral. The washed sample is dried at 40℃ to complete the chlorite exfoliation.

[0035] (2) Capsaicin-intercalated chlorite: Capsaicin was dissolved in acetone, and then exfoliated chlorite was dispersed in the above solution. The mass ratio of capsaicin to exfoliated chlorite was 5:1, and the mass ratio of the total mass of capsaicin and exfoliated chlorite to the mass of acetone was 1:15. The mixed system was ultrasonically treated for 20 h at 50°C. After the reaction was completed, the solid product was collected by solid-liquid separation, washed with acetone, dried and ground to obtain the capsaicin-intercalated chlorite composite filler.

[0036] (3) Preparation of anti-corrosion coating: 45wt% organosilicon epoxy resin, 5wt% capsaicin intercalated chlorite composite filler, 1wt% titanium dioxide, 5wt% mica powder, 10wt% solvent butyl acetate, 3wt% leveling agent BYK-410, 2wt% dispersant sodium dodecyl sulfate, 0.5wt% defoamer dimethyl silicone oil, and 1.0wt% silane coupling agent KH-590 are added to a mixing tank and stirred at a speed of 600r / min. After mixing evenly, the mixture is ground in a grinder until the particle size is 55μm. Component A is discharged. Component A is mixed evenly with n-butanol at a mass ratio of 10:1 to obtain the new anti-corrosion coating.

[0037] Example 4 A method for preparing an anti-corrosion coating containing capsaicin-intercalated chlorite composite filler includes the following steps: (1) Chlorite exfoliation: Chlorite mineral is ground into powder and passed through a 200-mesh sieve. The powder is dispersed in 1 mol / L citric acid at a solid-liquid mass ratio of 1:10. After stirring continuously for 6 h in a water bath at 80℃, the solid product is collected by solid-liquid separation. The solid product is washed repeatedly with deionized water until the supernatant is neutral. The washed sample is dried at 50℃ to complete the chlorite exfoliation.

[0038] (2) Capsaicin-intercalated chlorite: Capsaicin was dissolved in methanol, and then exfoliated chlorite was dispersed in the above solution. The mass ratio of capsaicin to exfoliated chlorite was 6:1, and the mass ratio of the total mass of capsaicin and exfoliated chlorite to methanol was 1:10. The mixture was ultrasonically treated for 12 h at 50°C. After the reaction was completed, the solid product was collected by solid-liquid separation, washed with methanol, dried and ground to obtain the capsaicin-intercalated chlorite composite filler.

[0039] (3) Preparation of anti-corrosion coating: According to the mass percentage, 35wt% of bisphenol A type epoxy resin, 5wt% capsaicin intercalated chlorite composite filler, 3wt% titanium dioxide, 5wt% mica powder, 10wt% solvent n-butanol, 0.1wt% leveling agent BYK-333, 3wt% dispersant sodium dodecyl sulfate, 0.5wt% dimethyl silicone oil, and 2.0wt% silane coupling agent KH-570 are added to a mixing tank, and the stirring is turned on to mix at a stirring speed of 500r / min. After mixing evenly, the mixture is ground in a grinding mill until the particle size is 60μm. Component A is discharged. Component A is mixed evenly with dibutyl phthalate at a mass ratio of 6:1 to obtain the new anti-corrosion coating.

[0040] Example 5 A method for preparing an anti-corrosion coating containing capsaicin-intercalated chlorite composite filler includes the following steps: (1) Chlorite exfoliation: Chlorite mineral is ground into powder and passed through a 200-mesh sieve. The powder is dispersed in oxalic acid with a concentration of 1 mol / L at a solid-liquid mass ratio of 1:12. After stirring continuously for 12 h in a water bath at 70℃, the solid product is collected by solid-liquid separation. The solid product is washed repeatedly with deionized water until the supernatant is neutral. The washed sample is dried at 60℃ to complete the chlorite exfoliation.

[0041] (2) Capsaicin-intercalated chlorite: Capsaicin was dissolved in ethanol, and then exfoliated chlorite was dispersed in the above solution. The mass ratio of capsaicin to exfoliated chlorite was 3:1, and the mass ratio of the total mass of capsaicin and exfoliated chlorite to the mass of ethanol was 1:12. The mixture was ultrasonically treated for 6 h at 60°C. After the reaction was completed, the solid product was collected by solid-liquid separation, washed with ethanol, dried and ground to obtain the capsaicin-intercalated chlorite composite filler.

[0042] (3) Preparation of anti-corrosion coating: According to the mass percentage, 30wt% phenolic epoxy resin, 10wt% capsaicin intercalated chlorite composite filler, 5wt% titanium dioxide, 2wt% mica powder, 15wt% butyl acetate, 3wt% leveling agent BYK-390, 1wt% dispersant sodium dodecyl sulfate, 0.5wt% tributyl phosphate, and 0.5wt% silane coupling agent KH-570 are added to a mixing tank, and the stirring is turned on to mix at a stirring speed of 600r / min. After mixing evenly, the mixture is ground in a grinder until the particle size is 60 μm. Component A is discharged. Component A is mixed evenly with isophorone diamine at a mass ratio of 12:1 to obtain the new anti-corrosion coating.

[0043] Comparative Example 1 The preparation method is the same as in Example 1, except that the intercalation step is omitted.

[0044] Comparative Example 1 (used to demonstrate the absence of capsaicin in the intercalation step, highlighting the role of the pretreatment step for intercalation in improving the overall performance of the anti-corrosion coating).

[0045] Comparative Example 2 The preparation method of Example 1 is the same as that of Example 1. The difference is that the direct blending method of step (3) is used to directly mix capsaicin and chlorite into other materials of component AB to prepare anti-corrosion coating, thereby demonstrating the role of chlorite exfoliation and capsaicin intercalation in improving the performance of the entire anti-corrosion coating.

[0046] The coatings from Examples 1-5 and Comparative Examples 1-2 were used to prepare coatings. The anti-corrosion performance of the coatings was tested using GB / T 40299-2021 and GB 4789.2-2022. The test results are shown in Table 1.

[0047] Table 1 Corrosion potential / V Corrosion current / A Escherichia coli inhibition rate (%) Staphylococcus aureus inhibition rate (%) Duration of antibacterial activity (3000h) Example 1 -0.460 <![CDATA[0.468x10 -8 ]]> 98.9 98.8 No bacteria attached Example 2 -0.412 <![CDATA[0.389 x10 -9 ]]> 99.5 99.4 No bacteria attached Example 3 -0.442 <![CDATA[0.433x10 -8 ]]> 99.1 99.0 No bacteria attached Example 4 -0.426 <![CDATA[0.417x10 -9 ]]> 99.3 99.3 No bacteria attached Example 5 -0.434 <![CDATA[0.413x10 -8 ]]> 99.2 99.2 No bacteria attached Comparative Example 1 -0.505 <![CDATA[0.239x10 -7 ]]> 85.2% 82.3% Bacterial attachment Comparative Example 2 -0.537 <![CDATA[0.314x10 -6 ]]> 77.6% 74.2% Bacterial attachment As shown in Table 1, the anti-corrosion coating based on the capsaicin-intercalated chlorite composite filler prepared according to this invention exhibits the best corrosion resistance. Its corrosion current is significantly lower than that of the unintercalated composite filler and the physically blended control group, while the corrosion potential shifts positively. This proves that the coating has a stronger inhibitory ability on the corrosion reaction of the metal substrate. In addition, in the antibacterial performance test, the coating showed the highest inhibition rate and the most durable antibacterial effect against both Escherichia coli and Staphylococcus aureus. The above results fully verify that the triple synergistic anti-corrosion mechanism of "physical shielding-chemical slow release-biological inhibition" constructed by intercalation effectively solves the pain point of easy inactivation and loss of preservatives in traditional coatings, thereby achieving a leapfrog improvement in anti-corrosion performance.

Claims

1. A method for preparing a capsaicin-intercalated chlorite composite filler, characterized in that, Includes the following steps: (1) Chlorite exfoliation: After grinding chlorite mineral into powder, disperse the powder in organic acid at a solid-liquid mass ratio of 1:10 to 1:

20. After heating and stirring in a water bath, collect the solid product by solid-liquid separation. Wash repeatedly with deionized water until the supernatant is neutral. Dry the washed sample to complete the chlorite exfoliation. (2) Capsaicin intercalated chlorite: Capsaicin is dissolved in an organic solvent, and then the exfoliated chlorite is dispersed in the above solution. Under heating conditions, the mixed system is ultrasonically treated. After the reaction is completed, the solid product is collected by solid-liquid separation, washed with the same solvent, dried and ground to obtain the capsaicin intercalated chlorite composite filler.

2. The preparation method according to claim 1, characterized in that, The organic acid in step (1) is one of oxalic acid and citric acid, with a concentration of 1 mol / L.

3. The preparation method according to claim 1, characterized in that, In step (1), the water bath is heated and stirred at a temperature of 60-80℃ for 6-24 hours.

4. The preparation method according to claim 1, characterized in that, The drying process in step (1) is carried out at a temperature of 35~60℃.

5. The preparation method according to claim 1, characterized in that, In step (2), the mass ratio of capsaicin to exfoliated chlorite is 3~6:1, and the mass ratio of the total mass of capsaicin and exfoliated chlorite to the mass of organic solvent is 1:10~1:

20.

6. The preparation method according to claim 1, characterized in that, The heating conditions for step (2) are 40~60℃ and the ultrasonic treatment time is 6~24 h.

7. A novel anti-corrosion coating prepared by capsaicin-intercalated chlorite composite filler, characterized in that, Component A, which contains capsaicin-intercalated chlorite composite filler, is mixed with component B at a mass ratio of 4 to 12:1 to obtain a novel anti-corrosion coating.

8. The novel anti-corrosion coating as described in claim 7, characterized in that, Component A is prepared by adding epoxy resin, capsaicin-intercalated chlorite composite filler, auxiliary filler, solvent, leveling agent, dispersant, defoamer, and silane coupling agent into a mixing tank, stirring at a speed of 500-800 r / min, and grinding the mixture in a grinder until the particle size is 50-60 μm. The resulting epoxy resin slurry is component A.

9. The novel anti-corrosion coating as described in claim 7 or 8, characterized in that, The content of the capsaicin-intercalated chlorite composite filler is 1-10% of the total weight of component A.

10. The novel anti-corrosion coating as described in claim 7, characterized in that, Component B is obtained by mixing isophorone diamine, dibutyl phthalate, and n-butanol evenly.