Anti-corrosion material of nano silicon carbide ceramic as well as preparation method and application of anti-corrosion material
By modifying and grafting nano silicon carbide, functional particles were prepared and blended with vinyl polyester resin, which solved the problem of insufficient corrosion resistance of existing anticorrosion materials in high-temperature flue gas environments, and achieved excellent corrosion resistance and temperature resistance.
Patent Information
- Application Number
- CN202510445217.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2025-07-11
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing anticorrosion materials have insufficient corrosion resistance in high-temperature flue gas environments, which is difficult to meet the requirements of long-term operation of industrial equipment and are easily damaged.
By modifying the nano silicon carbide with silane coupling agent KH-540, modifying the amino group, and grafting it with isocyanate groups and β-cyclodextrin, functional particles are prepared and blended with vinyl polyester resin to form a corrosion-resistant material with excellent corrosion resistance.
The prepared anticorrosion materials exhibit excellent corrosion resistance at high temperatures, extend their service life, and "embed" the corrosion medium through the microporous structure of β-cyclodextrin, which significantly enhances the temperature resistance effect.
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Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of anticorrosive materials, and particularly relates to an anticorrosive material of nano-silicon carbide ceramics, a preparation method thereof, and an application thereof. Background Art
[0002] In the field of industrial equipment, due to the wet desulfurization steel-based chimney, wet desulfurization steel-based flue, and the inner wall of the desulfurization tower being exposed to high-temperature flue gas containing acidic media and particulate matter for a long time, it is extremely easy to cause corrosion. At present, coating anticorrosive materials to enhance the anti-corrosion performance is one of the effective methods to solve the above problems. Among them, most of the existing anticorrosive materials are added with nano-silicon carbide ceramics. With the excellent physical and chemical properties of nano-silicon carbide ceramics, the corrosion resistance of the anticorrosive materials can be further enhanced. However, such anticorrosive materials still have certain defects that limit their actual application effects, specifically manifested as follows: on the one hand, when the anticorrosive material faces long-term exposure, its corrosion resistance effect is not very good, and it is still difficult to meet the requirements of long-term operation of industrial equipment; on the other hand, the temperature of most flue gases is also relatively high, which is likely to directly cause irreversible damage to the anticorrosive material, seriously restricting the due corrosion resistance. Summary of the Invention
[0003] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide an anticorrosive material of nano-silicon carbide ceramics, a preparation method thereof, and an application thereof. The present invention creatively modifies nano-silicon carbide with silane coupling agent KH-540, modifies amino groups, and then based on the fact that active hydrogen-containing groups are easy to react with isocyanate groups, successively adds toluene diisocyanate containing two isocyanate groups and β-cyclodextrin containing multiple hydroxyl groups for grafting, so as to realize the bonding of β-cyclodextrin and nano-silicon carbide, and prepare β-cyclodextrin nano-silicon carbide. Then, using toluene diisocyanate as a bridging agent, an organosilicon compound obtained by ring-opening polymerization of D4 and an amino capping agent is bridged, thereby preparing functional particles. After blending them with materials such as vinyl polyester resin, an anticorrosive material is prepared, which has excellent corrosion resistance and good heat resistance, and is very suitable for application in wet desulfurization steel-based chimneys, wet desulfurization steel-based flues, and the inner walls of desulfurization towers.
[0004] The purpose of the present invention can be achieved by the following technical solutions:
[0005] An anticorrosive material of nano-silicon carbide ceramics, which is prepared from 100 parts by weight of vinyl polyester resin, 20 - 25 parts by weight of functional particles, 3 - 4 parts by weight of initiator, and 4 parts by weight of accelerator.
[0006] As a preferred technical solution of the present invention, the functional particles are prepared by the following steps:
[0007] (1) Mix the ethanol aqueous solution, nano silicon carbide, and silane coupling agent KH-540 at a mass ratio of 100 - 120:2 - 3:2 - 2.5 with stirring in ultrasonic waves at 60 - 75 °C for 18 - 24 h, filter, take the filter residue, wash it with deionized water, and finally dry it under vacuum at 60 - 90 °C until constant weight to obtain amino nano silicon carbide; Mix toluene, amino nano silicon carbide, toluene diisocyanate, and dibutyltin dilaurate at a mass ratio of 100 - 120:2 - 3:5:0.3 with stirring in a nitrogen atmosphere at 70 - 80 °C for 8 - 10 h, filter, take the filter residue, wash it with toluene, and finally dry it under vacuum at 40 - 60 °C until constant weight to obtain isocyanate group nano silicon carbide;
[0008] (2) Add 5 - 7 parts by weight of β-cyclodextrin to 100 parts by weight of N,N-dimethylformamide, then stir at room temperature until completely dissolved, add 2 parts by weight of isocyanate group nano silicon carbide, then stir and mix in a nitrogen atmosphere at 70 - 80 °C for 24 - 28 h, filter, take the filter residue, wash it with deionized water, and finally dry it under vacuum at 40 - 60 °C until constant weight to obtain β-cyclodextrin nano silicon carbide;
[0009] (3) Add 15 - 20 parts by weight of toluene, 2 - 3 parts by weight of β-cyclodextrin nano silicon carbide, 0.8 - 1 part by weight of organosilicon compound, and 0.5 part by weight of dibutyltin dilaurate to 120 - 130 parts by weight of N,N-dimethylformamide, then while stirring, dropwise add 0.2 - 0.3 part by weight of toluene diisocyanate in a nitrogen atmosphere at 70 - 80 °C. After all the dropping is completed, continue to stir at a constant temperature for 8 - 9 h for mixing, filter, take the filter residue, wash it with deionized water, and finally dry it under vacuum at 40 - 60 °C until constant weight, then the preparation is completed.
[0010] Further, the mass fraction of the ethanol aqueous solution in step (1) is 98 - 99%.
[0011] Further, the power of the ultrasonic wave in step (1) is 400 - 500 W.
[0012] Further, the organosilicon compound in step (3) is prepared through the following steps:
[0013] Mix octamethylcyclotetrasiloxane, 1,3-bis(aminopropyl)tetramethyldisiloxane, and tetramethylammonium hydroxide at a mass ratio of 50:10 - 12:0.5 with stirring in a nitrogen atmosphere at 85 - 90 °C for 9 - 10 h, and then purify it to complete the preparation.
[0014] Preferably, the purification means heating to 180 °C at a heating rate of 3 - 5 °C / min and then holding for 20 - 30 min to remove low-boiling substances.
[0015] Further, the dropping rate in step (3) is controlled at 2 - 4 s / drop.
[0016] As a preferred technical solution of the present invention, the initiator is methyl ethyl ketone peroxide.
[0017] As a preferred technical solution of the present invention, the accelerator is cobalt isooctanoate.
[0018] A preparation method of an anti-corrosion material for nano-silicon carbide ceramics, the preparation method comprising the following steps:
[0019] Add functional particles, an initiator and an accelerator to vinyl polyester resin, and then stir and mix at a stirring speed of 500 - 1000 rpm at room temperature for 10 - 15 min to complete the preparation.
[0020] An application of an anti-corrosion material for nano-silicon carbide ceramics, the anti-corrosion material is applied to the wet desulfurization steel chimney, the wet desulfurization steel flue, and the inner wall of the desulfurization tower.
[0021] The beneficial effects of the present invention:
[0022] (1) The present invention creatively modifies nano-silicon carbide with silane coupling agent KH-540, modifies it with amino groups, and then based on the fact that active hydrogen-containing groups are easy to react with isocyanate groups, successively adds toluene diisocyanate containing two isocyanate groups and β-cyclodextrin containing multiple hydroxyl groups for grafting, so as to realize the bonding of β-cyclodextrin and nano-silicon carbide, and obtain β-cyclodextrin nano-silicon carbide. Then, using toluene diisocyanate as a bridging agent, an organosilicon compound obtained by ring-opening polymerization of D4 and an amino capping agent is bridged, thereby preparing functional particles. After blending them with materials such as vinyl polyester resin, an anti-corrosion material is obtained, which has excellent corrosion resistance and good temperature resistance, and is very suitable for application in wet desulfurization steel chimneys, wet desulfurization steel flues, and the inner walls of desulfurization towers.
[0023] (2) The present invention creatively prepares a functional particle by multi-modifying nano-silicon carbide, endowing the anti-corrosion material with very excellent corrosion resistance. It not only effectively extends the service life but also has good heat resistance, maintaining good corrosion resistance even at relatively high temperatures. Compared with the prior art, the functional particle realizes the bonding of β-cyclodextrin. Through the unique micropore and cavity structures of β-cyclodextrin, it has an effect similar to "embedding" and "fixing" on the corrosive medium, making the corrosive medium relatively "concentrated" on the surface of nano-silicon carbide, reducing the diffusion rate and the impact on the substrate. However, simply bonding β-cyclodextrin cannot achieve good results. The key lies in the use of toluene diisocyanate twice in the preparation process of the functional particle. The benzene ring group it has can regulate the spatial structure of β-cyclodextrin, thereby enhancing the "embedding" stability and ensuring the proper function of β-cyclodextrin. Introducing an organosilicon compound with a certain molecular weight can greatly improve the cohesive energy of the anti-corrosion material, enhance the intermolecular force, inhibit the mobility of molecular chains, and significantly enhance the heat resistance effect (if the molecular weight is too large, it will affect the interfacial compatibility between the functional particle and the substrate; if the molecular weight is too small, it is difficult to improve the cohesive energy well).
[0024] (3) The anti-corrosion material prepared by the present invention can be used simply according to the conventional and existing coating processes, which is very convenient, has strong universality, and has good application prospects. Specific embodiments
[0025] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the specific embodiments, structures, features, and effects of the present invention in combination with examples.
[0026] The vinyl polyester resin in all examples and comparative examples of the present invention was purchased from Wuxi Xinyexin Chemical Co., Ltd., with the model XYH3002; the nano-silicon carbide was purchased from Beijing Decodaojin Technology Co., Ltd., with the model DK-SiC-001 and an average particle size of 40 nm; the toluene diisocyanate was purchased from Tonglan New Energy Technology Development (Shandong) Group Co., Ltd., with the model TDI-80; the β-cyclodextrin was purchased from Shanghai Zhongfeng Biotechnology Co., Ltd., with a mesh number of 120 mesh.
[0027] Example 1
[0028] An anti-corrosion material of nano-silicon carbide ceramics, which is prepared from 100 parts by weight of vinyl polyester resin, 20 parts by weight of functional particles, 3 parts by weight of initiator, and 4 parts by weight of accelerator.
[0029] The functional particle is prepared through the following steps:
[0030] (1) Mix an ethanol aqueous solution, nano silicon carbide, and silane coupling agent KH-540 at a mass ratio of 100:2:2 with stirring under ultrasonic waves at 60 °C for 18 h, filter, take the filter residue, wash it with deionized water, and finally dry it under vacuum at 60 °C until a constant weight is obtained to get amino nano silicon carbide; mix toluene, amino nano silicon carbide, toluene diisocyanate, and dibutyltin dilaurate at a mass ratio of 100:2:5:0.3 with stirring in a nitrogen atmosphere at 70 °C for 8 h, filter, take the filter residue, wash it with toluene, and finally dry it under vacuum at 40 °C until a constant weight is obtained to get isocyanate group nano silicon carbide;
[0031] (2) Add 5 parts by weight of β-cyclodextrin to 100 parts by weight of N,N-dimethylformamide, then stir at room temperature until completely dissolved, add 2 parts by weight of isocyanate group nano silicon carbide, then stir and mix in a nitrogen atmosphere at 70 °C for 24 h, filter, take the filter residue, wash it with deionized water, and finally dry it under vacuum at 40 °C until a constant weight is obtained to get β-cyclodextrin nano silicon carbide;
[0032] (3) Add 15 parts by weight of toluene, 2 parts by weight of β-cyclodextrin nano silicon carbide, 0.8 part by weight of organosilicon compound, and 0.5 part by weight of dibutyltin dilaurate to 120 parts by weight of N,N-dimethylformamide, then while stirring in a nitrogen atmosphere at 70 °C, dropwise add 0.2 part by weight of toluene diisocyanate, continue to stir at a constant temperature for 8 h after all the dropping is completed, filter, take the filter residue, wash it with deionized water, and finally dry it under vacuum at 40 °C until a constant weight is obtained, thus the preparation is completed.
[0033] The mass fraction of the ethanol aqueous solution described in step (1) is 98%.
[0034] The power of the ultrasonic waves described in step (1) is 400 W.
[0035] The organosilicon compound described in step (3) is prepared through the following steps:
[0036] Mix octamethylcyclotetrasiloxane, 1,3-bis(aminopropyl)tetramethyldisiloxane, and tetramethylammonium hydroxide at a mass ratio of 50:10:0.5 with stirring in a nitrogen atmosphere at 85 °C for 9 h, and then perform purification, thus the preparation is completed.
[0037] The purification refers to heating to 180 °C at a heating rate of 3 °C / min and then holding for 20 min to remove low-boiling substances.
[0038] The dropping rate described in step (3) is controlled at 2 s / drop.
[0039] The initiator is methyl ethyl ketone peroxide.
[0040] The accelerator is cobalt isooctanoate.
[0041] A preparation method of an anti-corrosion material for nano-silicon carbide ceramics, the preparation method comprising the following steps:
[0042] Add functional particles, initiator and accelerator to vinyl polyester resin, and then stir at a stirring speed of 500 rpm at room temperature for 10 min for mixing, thus completing the preparation.
[0043] An application of an anti-corrosion material for nano-silicon carbide ceramics, the anti-corrosion material being applied to a wet flue gas desulfurization steel chimney.
[0044] Example 2
[0045] An anti-corrosion material for nano-silicon carbide ceramics, the anti-corrosion material being prepared from 100 parts by weight of vinyl polyester resin, 25 parts by weight of functional particles, 4 parts by weight of initiator and 4 parts by weight of accelerator.
[0046] The functional particles are prepared by the following steps:
[0047] (1) Mix an ethanol aqueous solution, nano-silicon carbide and silane coupling agent KH-540 at a mass ratio of 120:3:2.5 and stir in ultrasonic wave at 75 °C for 24 h for mixing, filter, take the filter residue, wash with deionized water, and finally vacuum dry at 90 °C until constant weight to obtain amino nano-silicon carbide; mix toluene, amino nano-silicon carbide, toluene diisocyanate and dibutyltin dilaurate at a mass ratio of 120:3:5:0.3 and stir in a nitrogen atmosphere at 80 °C for 10 h for mixing, filter, take the filter residue, wash with toluene, and finally vacuum dry at 60 °C until constant weight to obtain isocyanate group nano-silicon carbide;
[0048] (2) Add 7 parts by weight of β-cyclodextrin to 100 parts by weight of N,N-dimethylformamide, then stir at room temperature until completely dissolved, add 2 parts by weight of isocyanate group nano-silicon carbide, then stir in a nitrogen atmosphere at 80 °C for 28 h for mixing, filter, take the filter residue, wash with deionized water, and finally vacuum dry at 60 °C until constant weight to obtain β-cyclodextrin nano-silicon carbide;
[0049] (3) Add 20 parts by weight of toluene, 3 parts by weight of β-cyclodextrin nano-silicon carbide, 1 part by weight of organosilicon compound and 0.5 part by weight of dibutyltin dilaurate to 130 parts by weight of N,N-dimethylformamide, then dropwise add 0.3 part by weight of toluene diisocyanate while stirring in a nitrogen atmosphere at 80 °C, continue to stir at a constant temperature for 9 h for mixing after all dropping is completed, filter, take the filter residue, wash with deionized water, and finally vacuum dry at 60 °C until constant weight, thus completing the preparation.
[0050] The mass fraction of the ethanol aqueous solution in step (1) is 99%.
[0051] The power of the ultrasonic wave in step (1) is 500 W.
[0052] The organosilicon compound in step (3) is prepared through the following steps:
[0053] Octamethylcyclotetrasiloxane, 1,3-bis(aminopropyl)tetramethyldisiloxane and tetramethylammonium hydroxide are stirred and mixed at a mass ratio of 50:12:0.5 in a nitrogen atmosphere at 90 °C for 10 h, and then purified to complete the preparation.
[0054] The purification refers to heating to 180 °C at a heating rate of 5 °C / min and then holding for 30 min to remove low-boiling substances.
[0055] The dropping rate in step (3) is controlled at 4 s / drop.
[0056] The initiator is methyl ethyl ketone peroxide.
[0057] The accelerator is cobalt isooctanoate.
[0058] A preparation method of an anti-corrosion material for nano-silicon carbide ceramics, the preparation method comprising the following steps:
[0059] Functional particles, an initiator and an accelerator are added to vinyl polyester resin, and then stirred and mixed at a stirring speed of 1000 rpm at room temperature for 15 min to complete the preparation.
[0060] An application of an anti-corrosion material for nano-silicon carbide ceramics, the anti-corrosion material is applied to a wet flue gas desulfurization steel-based flue.
[0061] Example 3
[0062] An anti-corrosion material for nano-silicon carbide ceramics, the anti-corrosion material is prepared from 100 parts by weight of vinyl polyester resin, 23 parts by weight of functional particles, 3.5 parts by weight of initiator and 4 parts by weight of accelerator.
[0063] The functional particles are prepared through the following steps:
[0064] (1) An ethanol aqueous solution, nano-silicon carbide and silane coupling agent KH-540 are stirred and mixed at a mass ratio of 110:2.5:2.3 under ultrasonic wave at 70 °C for 20 h, filtered, the filter residue is taken, washed with deionized water, and finally vacuum dried at 80 °C until constant weight to obtain amino nano-silicon carbide; Toluene, amino nano-silicon carbide, toluene diisocyanate and dibutyltin dilaurate are stirred and mixed at a mass ratio of 110:2.5:5:0.3 in a nitrogen atmosphere at 75 °C for 9 h, filtered, the filter residue is taken, washed with toluene, and finally vacuum dried at 50 °C until constant weight to obtain isocyanate group nano-silicon carbide;
[0065] (2) Add 6 parts by weight of β-cyclodextrin to 100 parts by weight of N,N-dimethylformamide, then stir at room temperature until completely dissolved. Add 2 parts by weight of isocyanate-functionalized nano-silicon carbide, and then stir and mix in a nitrogen atmosphere at 75 °C for 26 h. Filter, collect the filter residue, wash it with deionized water, and finally dry it under vacuum at 50 °C until a constant weight is obtained to obtain β-cyclodextrin nano-silicon carbide;
[0066] (3) Add 18 parts by weight of toluene, 2.5 parts by weight of β-cyclodextrin nano-silicon carbide, 0.9 part by weight of organosilicon compound, and 0.5 part by weight of dibutyltin dilaurate to 125 parts by weight of N,N-dimethylformamide. Then, while stirring, add 0.25 part by weight of toluene diisocyanate dropwise in a nitrogen atmosphere at 75 °C. After all the addition is completed, continue to stir and mix at a constant temperature for 8.5 h. Filter, collect the filter residue, wash it with deionized water, and finally dry it under vacuum at 50 °C until a constant weight is obtained, thus completing the preparation.
[0067] The mass fraction of the ethanol aqueous solution described in step (1) is 98.5%.
[0068] The power of the ultrasonic wave described in step (1) is 450 W.
[0069] The organosilicon compound described in step (3) is prepared through the following steps:
[0070] Mix octamethylcyclotetrasiloxane, 1,3-bis(aminopropyl)tetramethyldisiloxane, and tetramethylammonium hydroxide in a mass ratio of 50:11:0.5 and stir and mix in a nitrogen atmosphere at 88 °C for 9.5 h, then purify to complete the preparation.
[0071] The purification refers to heating to 180 °C at a heating rate of 4 °C / min and then holding for 25 min to remove low-boiling substances.
[0072] The dropping rate described in step (3) is controlled at 3 s / drop.
[0073] The initiator is methyl ethyl ketone peroxide.
[0074] The accelerator is cobalt octoate.
[0075] A preparation method of an anti-corrosion material for nano-silicon carbide ceramics, the preparation method comprising the following steps:
[0076] Add functional particles, an initiator, and an accelerator to vinyl polyester resin, and then stir and mix at a stirring speed of 800 rpm at room temperature for 13 min to complete the preparation.
[0077] An application of an anti-corrosion material for nano-silicon carbide ceramics, the anti-corrosion material is applied to the inner wall of a desulfurization tower.
[0078] Comparative Example 1
[0079] On the basis of Example 3, the functional particles were changed to nano silicon carbide of equal weight, and the rest remained unchanged.
[0080] Comparative Example 2
[0081] On the basis of Example 3, the mass ratio of octamethylcyclotetrasiloxane, 1,3-bis(aminopropyl)tetramethyldisiloxane and tetramethylammonium hydroxide was changed to 50:8:0.5, and the rest remained unchanged.
[0082] Comparative Example 3
[0083] On the basis of Example 3, the mass ratio of octamethylcyclotetrasiloxane, 1,3-bis(aminopropyl)tetramethyldisiloxane and tetramethylammonium hydroxide was changed to 50:14:0.5, and the rest remained unchanged.
[0084] Comparative Example 4
[0085] Based on Example 3, the toluene diisocyanate in step (1) was replaced by an equal weight of hexamethylene diisocyanate, and the rest remained unchanged.
[0086] Comparative Example 5
[0087] Based on Example 3, in step (3), toluene diisocyanate was replaced by an equal weight of hexamethylene diisocyanate, and the rest remained unchanged.
[0088] Comparative Example 6
[0089] On the basis of Example 3, step (2) is changed to adding 6 parts by weight of ethylene glycol to 100 parts by weight of N,N-dimethylformamide, then stirring for 5 minutes at room temperature, adding 2 parts by weight of isocyanate-based nano-silicon carbide, then stirring for 26 hours in a nitrogen atmosphere at 75°C, filtering, taking the filter residue, washing with deionized water, and finally vacuum drying at 50°C until constant weight to obtain product A; in step (3), β-cyclodextrin nano-silicon carbide is changed to an equal weight of product A; the rest remains unchanged.
[0090] Test Example 1
[0091] Corrosion resistance test:
[0092] The anti-corrosion materials prepared in Example 3 and Comparative Examples 1-6 were brushed on the surface of a substrate (quartz glass, with a size of 50 mm * 50 mm * 5 mm), and then left naturally at room temperature for 48 hours to form a coating with a thickness of 100 μm, and then different test specimens were obtained; the above test specimens were completely immersed in a 50% by mass sulfuric acid aqueous solution at room temperature for 180 days, and the area ratio of the coating damaged (including cracks, blistering and falling off) was calculated.
[0093] Table 1. Corrosion Resistance Test Results
[0094]
[0095]
[0096] Test Example 2
[0097] Temperature Resistance Test:
[0098] The anticorrosive materials prepared in Example 3 and Comparative Examples 1-6 were respectively brushed on the surface of the substrate (quartz glass, with dimensions of 50mm * 50mm * 5mm), and then left to stand naturally at room temperature for 48h to form coatings with a thickness of 100μm. Then, they were placed in an oven at 105°C for heat treatment for 24h, taken out, and naturally cooled to room temperature, thereby obtaining different test specimens. At room temperature, the above test specimens were respectively completely immersed in a sulfuric acid aqueous solution with a mass fraction of 50% for 180 days, and the proportion of the area where the coating was damaged (including cracks, blisters, and peeling) was calculated.
[0099] Table 2. Temperature Resistance Test Results
[0100] Percentage of the damaged coating area Example 3 Approximately 5% Comparative Example 1 Approximately 39% Comparative Example 2 Approximately 12% Comparative Example 3 Approximately 13% Comparative Example 4 Approximately 15% Comparative Example 5 Approximately 13% Comparative Example 6 Approximately 17%
[0101] It can be seen from the comparison of Example 3, Comparative Examples 1-6, and Test Examples 1-2 that the anticorrosive material prepared by the present invention not only has excellent corrosion resistance but also has good temperature resistance. Even after high-temperature heat treatment, it can still maintain a good corrosion resistance effect.
[0102] The above is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to obtain equivalent embodiments with equivalent changes, but as long as the technical content of the present invention is not departed from, any brief modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. An anti-corrosion material for nano-silicon carbide ceramics, characterized in that: The anticorrosive material is prepared from 100 parts by weight of vinyl polyester resin, 20 - 25 parts by weight of functional particles, 3 - 4 parts by weight of initiator, and 4 parts by weight of accelerator.
2. The anticorrosive material of a nano-silicon carbide ceramic according to claim 1, characterized in that: The functional particles are prepared through the following steps: (1) Mix an ethanol aqueous solution, nano silicon carbide, and silane coupling agent KH - 540 at a mass ratio of 100 - 120:2 - 3:2 - 2.5 under ultrasonic stirring at 60 - 75 °C for 18 - 24 h, filter, take the filter residue, wash it with deionized water, and finally vacuum dry at 60 - 90 °C until constant weight to obtain amino nano silicon carbide; Mix toluene, amino nano silicon carbide, toluene diisocyanate, and dibutyltin dilaurate at a mass ratio of 100 - 120:2 - 3:5:0.3 under stirring in a nitrogen atmosphere at 70 - 80 °C for 8 - 10 h, filter, take the filter residue, wash it with toluene, and finally vacuum dry at 40 - 60 °C until constant weight to obtain isocyanate - group nano silicon carbide; (2) Add 5 - 7 parts by weight of β - cyclodextrin to 100 parts by weight of N,N - dimethylformamide, then stir at room temperature until completely dissolved, add 2 parts by weight of isocyanate - group nano silicon carbide, then stir in a nitrogen atmosphere at 70 - 80 °C for 24 - 28 h, filter, take the filter residue, wash it with deionized water, and finally vacuum dry at 40 - 60 °C until constant weight to obtain β - cyclodextrin nano silicon carbide; (3) Add 15 - 20 parts by weight of toluene, 2 - 3 parts by weight of β - cyclodextrin nano silicon carbide, 0.8 - 1 part by weight of organosilicon compound, and 0.5 part by weight of dibutyltin dilaurate to 120 - 130 parts by weight of N,N - dimethylformamide, then while stirring in a nitrogen atmosphere at 70 - 80 °C, dropwise add 0.2 - 0.3 part by weight of toluene diisocyanate. After all the addition is completed, continue stirring at a constant temperature for 8 - 9 h, filter, take the filter residue, wash it with deionized water, and finally vacuum dry at 40 - 60 °C until constant weight, thus the preparation is completed.
3. The anti-corrosion material of nano-silicon carbide ceramics according to claim 2, characterized in that: The mass fraction of the ethanol aqueous solution in step (1) is 98 - 99%.
4. The anti-corrosion material of nano-silicon carbide ceramics according to claim 2, characterized in that: The organosilicon compound in step (3) is prepared through the following steps: Mix octamethylcyclotetrasiloxane, 1,3 - bis(aminopropyl)tetramethyldisiloxane, and tetramethylammonium hydroxide at a mass ratio of 50:10 - 12:0.5 under stirring in a nitrogen atmosphere at 85 - 90 °C for 9 - 10 h, and then purify to complete the preparation.
5. An anti-corrosion material for nano-silicon carbide ceramics according to claim 4, characterized in that: The purification refers to heating to 180 °C at a heating rate of 3 - 5 °C / min and then holding for 20 - 30 min to remove low - boiling substances.
6. The anti-corrosion material for nano-silicon carbide ceramics according to claim 2, characterized in that: The dropping rate in step (3) is controlled at 2 - 4 s / drop.
7. The anti-corrosion material of nano-silicon carbide ceramic according to claim 1, characterized in that: The initiator is methyl ethyl ketone peroxide.
8. An anti-corrosion material for nano-silicon carbide ceramics according to claim 1, characterized in that: The accelerator is cobalt isooctanoate.
9. A method for preparing an anti-corrosion material for nano-silicon carbide ceramics according to any one of claims 1-8, characterized in that: The preparation method includes the following steps: Add functional particles, initiator, and accelerator to vinyl polyester resin, and then stir at a stirring speed of 500 - 1000 rpm at room temperature for 10 - 15 min to complete the preparation.
10. Use of an anti-corrosion material for nano-silicon carbide ceramics according to any one of claims 1-8, characterized in that: The anticorrosive material is applied to the wet - flue - gas desulfurization steel chimney, wet - flue - gas desulfurization steel flue, and the inner wall of the desulfurization tower.