Tunnel porcelainizing paint suitable for high altitude areas and preparation method thereof

Abstract

This invention provides a tunnel ceramic coating suitable for high-altitude areas and its preparation method, belonging to the field of coating technology. The ceramic coating, by mass percentage, comprises the following raw material components: 20-28% hydroxyl-modified polysiloxane, 5-9% glycidylamine epoxy resin, 5-9% bisphenol F epoxy resin, 4-8% silicon-containing elastic particles, 3-5% nano-silica, 8-12% 3-aminopropyltriethoxysilane, 0.3-0.6% film-forming aid, and the balance being solvent. This invention ensures that the prepared ceramic coating can maintain high hardness and high adhesion for a long time even in environments with large temperature differences.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically relating to a tunnel vitrification coating suitable for high-altitude areas and its preparation method. Background Technology

[0002] Porcelain-coated coatings are coatings that undergo physical or chemical changes at high temperatures to form a ceramic-like coating. These coatings typically contain inorganic silicates, ceramic particles, and other high-temperature resistant fillers. They maintain stability in high-temperature environments and will not peel or decompose due to temperature increases, making them suitable for applications requiring high-temperature resistance. In tunnels, porcelain-coated coatings can be used for fire protection, thermal insulation, waterproofing, moisture resistance, and aesthetic enhancement. For example, ventilation systems, lighting equipment, and cable trays in tunnels use porcelain-coated coatings to improve their temperature resistance and fire resistance.

[0003] Porcelain coatings face even more severe environmental challenges in tunnel applications at high altitudes. High altitudes experience significant diurnal temperature variations; high temperatures can lead to stress buildup within the coating, while low temperatures can cause the material to become brittle. This constant expansion and contraction caused by the large temperature difference can damage the internal structure of the coating, thus affecting its hardness. Furthermore, the different coefficients of thermal expansion between the substrate and the coating material mean that large temperature differences can weaken adhesion, leading to blistering or even peeling of the coating, thus impacting its performance. Summary of the Invention

[0004] To address the problems existing in the background art, the present invention provides a tunnel vitrification coating suitable for high-altitude areas and its preparation method, ensuring that the vitrified coating can maintain high hardness and high adhesion for a long time even in environments with large temperature differences.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a tunnel ceramic coating suitable for high-altitude areas, comprising, by weight percentage, the following raw material components: 20-28% hydroxyl-modified polysiloxane, 5-9% glycidylamine epoxy resin, 5-9% bisphenol F epoxy resin, 4-8% silicon-containing elastic particles, 3-5% nano-silica, 8-12% 3-aminopropyltriethoxysilane, 0.3-0.6% film-forming aid, and the balance being solvent.

[0006] Furthermore, the preparation method of the hydroxyl-modified polysiloxane is as follows:

[0007] A1. Add 545g of methyldiethoxysilane and 12g of allyl alcohol to a three-necked flask equipped with a stirrer, then add 0.055-0.065g of platinum dioxide. Stir well at room temperature, then slowly heat to 90℃ and react for 20h. Filter under vacuum and distill under reduced pressure to remove impurities and low-boiling substances to obtain a colorless and transparent liquid, which is the intermediate.

[0008] A2. The intermediate obtained in A1 is added dropwise to a 40% sulfuric acid solution (volume fraction). The mass ratio of the intermediate to the 40% sulfuric acid solution is 1:(3-4). After the addition is complete, the mixture is reacted at 35°C for 1 hour. The mixture is then filtered and repeatedly washed with distilled water until the pH of the washing solution is 7. The mixture is then dried in a vacuum drying oven at 60°C for 1 day to obtain a white powder, which is the hydroxyl-modified polysiloxane.

[0009] Furthermore, in A2, the intermediate is added at a rate of 1-1.2 mL / min.

[0010] Furthermore, the preparation method of the silicon-containing elastic particles is as follows: Take 50g of a phenyl silicone resin toluene solution with a solid content of 50-55%, add it to a three-necked flask, stir, add 25-40g of polydimethylsiloxane, reflux at 100℃ for 1h, remove the solvent under reduced pressure, cool to room temperature, add 0.4-0.6g of catalyst and 3-5g of crosslinking agent tetraethyl orthosilicate, stir evenly, remove air bubbles under vacuum, pour into a mold, cure at room temperature for 14d, cut, and grind to obtain silicon-containing elastic particles.

[0011] Further, the preparation method of the phenyl silicone resin toluene solution with a solid content of 50-55% is as follows: 80g of tetraethyl orthosilicate, 24.5g of hexamethyldisiloxane and 5g of diphenyldimethoxysilane are added to a three-necked flask. 22.7g of deionized water, 8g of ethanol and 6.5g of concentrated hydrochloric acid are added dropwise while stirring. The temperature is controlled at 25-30℃. After the addition is complete, stirring is continued for 30min. The temperature is raised to 75℃ and refluxed for 3.5h. Toluene is added for extraction, NaHCO3 is added for neutralization, and the pH of the system is adjusted to 8-9 with NaOH solution. The reaction is carried out for 45min, followed by dehydroxylation treatment. Hydrochloric acid is added for neutralization, some ethanol is distilled off, and the generated salt is filtered out. The solution is washed three times with water, dried with anhydrous calcium chloride, and then concentrated to a solid content of 50%-55%.

[0012] Furthermore, the catalyst comprises chelated type 200 titanate and dibutyltin dilaurate, and the mass ratio of the two is 1:(1-2).

[0013] Furthermore, the solvent includes one or a mixture of at least two of acetone, ethyl acetate, xylene, and dichloromethane.

[0014] Furthermore, the film-forming aid includes propylene glycol butyl ether and / or propylene glycol methyl ether acetate.

[0015] Secondly, the present invention provides a method for preparing the above-mentioned tunnel vitrification coating suitable for high-altitude areas, comprising the following steps:

[0016] S1. Mix hydroxyl-modified polysiloxane, glycidylamine epoxy resin, bisphenol F epoxy resin, silicon-containing elastic particles and nano-silica to obtain component A.

[0017] S2. Mix 3-aminopropyltriethoxysilane, film-forming aid and solvent to obtain component B;

[0018] S3. Mix component A and component B thoroughly to obtain a tunnel ceramic coating suitable for high-altitude areas.

[0019] This application has the following beneficial effects:

[0020] 1. The bisphenol F type epoxy resin used in this invention has low viscosity. During the filling process, its low viscosity is conducive to particle dispersion and wetting, ensuring uniform distribution of particles in the matrix, thereby improving the overall material density. When glycidylamine type epoxy resin is mixed with other types of epoxy resin, it can improve the adhesion and overall bonding force of the system, which helps to firmly anchor and densely fill particles in the matrix. The two work synergistically to improve the hardness and adhesion of the coating. Hydroxyl-modified polysiloxane, by introducing hydroxyl groups, enhances the chemical bond with epoxy resin, which can generate a more stable network structure, helping the coating maintain excellent mechanical properties and adhesion under large temperature difference conditions.

[0021] Nano-silica, as a hard particle, can significantly improve the hardness of the coating. When it works synergistically with silicon-containing elastic particles, the latter can introduce flexibility into the coating, relieving stress caused by temperature changes or external forces, thereby reducing the generation and propagation of cracks and maintaining the hardness of the coating. At the same time, silicon-containing elastic particles, through their unique silicon-oxygen skeleton, can form a strong interaction with epoxy resin, improving the adhesion between the coating and the substrate. The addition of nano-silica can form more contact points between the coating and the substrate, increasing friction and further improving adhesion. Silicon-containing elastic particles and nano-silica are added together as elastic particles and hard particles, respectively, and through a synergistic effect, they synergistically improve the hardness and adhesion of the coating.

[0022] 2. In the preparation of silicon-containing elastic particles, the reaction between phenyl silicone resin and polydimethylsiloxane can form a tightly cross-linked network structure. This structure provides excellent mechanical strength at the molecular level, thereby improving the hardness of the coating macroscopically. At the same time, the increase in cross-linking density helps the coating maintain the stability of its internal structure when facing temperature changes, reducing performance degradation caused by temperature fluctuations. The elastic properties of silicon-containing elastic particles enable the coating to effectively absorb and disperse internal stress caused by temperature differences, reducing cracks and peeling phenomena that may occur in the coating under temperature difference cycling, improving the durability of the coating, and helping the coating maintain good adhesion to the substrate for a long time in environments with large temperature differences. Furthermore, phenyl silicone resin, due to the presence of phenyl in its molecular structure, has higher heat resistance, which helps to improve the performance stability and durability of the coating in high-temperature or extreme environments. Attached Figure Description

[0023] Figure 1 The hardness comparison trend of the vitrified coatings prepared in Examples 1-8 and Comparative Examples 1-9 of this invention before and after 14 days of large temperature difference environmental treatment.

[0024] Figure 2 The adhesion trend of the vitrified coatings prepared in Examples 1-8 and Comparative Examples 1-9 of this invention before and after 14 days of treatment in a large temperature difference environment is compared. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the embodiments.

[0026] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application are all commercially available.

[0027] Example 1: A tunnel ceramic coating suitable for high-altitude areas, comprising the following raw material components by mass percentage: 25% hydroxyl-modified polysiloxane, 7% glycidylamine epoxy resin, 7% bisphenol F epoxy resin, 6% silicon-containing elastic particles, 4% nano-silica, 10% 3-aminopropyltriethoxysilane, 0.4% film-forming aid, and 40.6% solvent. The film-forming aid is propylene glycol butyl ether. The solvent is acetone.

[0028] Among them, glycidylamine epoxy resin (AG-80) was purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd.; bisphenol F epoxy resin (F-170 industrial grade) was purchased from Guangzhou Yihuisheng Chemical Co., Ltd.; nano silica (TSP-L12) was purchased from Jiangsu Tianxing New Materials Co., Ltd.; and 3-aminopropyltriethoxysilane was purchased from Hubei Jiente Biomedical Co., Ltd.

[0029] The preparation method of hydroxyl-modified polysiloxane is as follows:

[0030] A1. Add 545g of methyldiethoxysilane and 12g of allyl alcohol to a three-necked flask equipped with a stirrer, then add 0.06g of platinum dioxide. Stir well at room temperature, then slowly heat to 90℃ and react for 20h. Filter under vacuum and distill under reduced pressure to remove impurities and low-boiling substances to obtain a colorless and transparent liquid, which is the intermediate.

[0031] A2. The intermediate obtained in A1 was added dropwise to a 40% sulfuric acid solution (volume fraction). The mass ratio of the intermediate to the 40% sulfuric acid solution was 1:3.5. The dropping rate of the intermediate was 1.1 mL / min. After the addition was complete, the mixture was reacted at 35°C for 1 h. The mixture was then filtered and repeatedly washed with distilled water until the pH of the washing solution was 7. The mixture was then dried in a vacuum drying oven at 60°C for 1 day to obtain a white powder, which is the hydroxyl-modified polysiloxane.

[0032] The preparation method of silicon-containing elastic particles is as follows: Take 50g of a 52% solid content phenyl silicone resin toluene solution, add it to a three-necked flask, stir, add 35g of polydimethylsiloxane, reflux at 100℃ for 1h, remove the solvent under reduced pressure, cool to room temperature, add 0.5g of catalyst and 4g of crosslinking agent tetraethyl orthosilicate, stir evenly, remove air bubbles under vacuum, pour into a mold, cure at room temperature for 14 days, cut, and grind to obtain silicon-containing elastic particles. Polydimethylsiloxane (9016-00-6) was purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd.

[0033] The catalyst comprises chelated type 200 titanate and dibutyltin dilaurate in a mass ratio of 1:1.5. Chelated type 200 titanate was purchased from Nanjing Qizheng Chemical Co., Ltd., and dibutyltin dilaurate was purchased from Hubei Longxin Chemical Industry Co., Ltd.

[0034] The preparation method of a phenyl silicone resin toluene solution with a solid content of 52% is as follows: 80g of tetraethyl orthosilicate, 24.5g of hexamethyldisiloxane, and 5g of diphenyldimethoxysilane are added to a three-necked flask. 22.7g of deionized water, 8g of ethanol, and 6.5g of concentrated hydrochloric acid are added dropwise while stirring. The temperature is controlled at around 28℃. After the addition is complete, stirring is continued for 30min. The temperature is then raised to 75℃ and refluxed for 3.5h. Toluene is added for extraction, NaHCO3 is added for neutralization, and the pH of the system is adjusted to 8-9 with NaOH solution. The reaction is carried out for 45min, followed by dehydroxylation treatment. Hydrochloric acid is added for neutralization, some ethanol is distilled off, and the generated salt is filtered out. The solution is washed three times with water, dried with anhydrous calcium chloride, and then concentrated to a solid content of 52%.

[0035] The preparation method of this tunnel vitrification coating suitable for high-altitude areas includes the following steps:

[0036] S1. Mix hydroxyl-modified polysiloxane, glycidylamine epoxy resin, bisphenol F epoxy resin, silicon-containing elastic particles and nano-silica to obtain component A.

[0037] S2. Mix 3-aminopropyltriethoxysilane, dispersant, wetting agent, film-forming aid and solvent to obtain component B;

[0038] S3. Mix component A and component B thoroughly to obtain a tunnel ceramic coating suitable for high-altitude areas.

[0039] The application of this tunnel vitrification coating suitable for high-altitude areas involves coating and drying the substrate surface with the coating to obtain a resin coating, and then vitrifying the resin coating at a high temperature of 900℃ to obtain a vitrified coating.

[0040] Example 2: The difference between this example and Example 1 is that: a tunnel ceramic coating suitable for high-altitude areas, by mass percentage, includes the following raw material components: 20% hydroxyl-modified polysiloxane, 5% glycidylamine epoxy resin, 5% bisphenol F epoxy resin, 4% silicon-containing elastic particles, 3% nano-silica, 8% 3-aminopropyltriethoxysilane, 0.3% film-forming aid, and 54.7% solvent.

[0041] Example 3: The difference between this example and Example 1 is that: a tunnel ceramic coating suitable for high-altitude areas, by mass percentage, includes the following raw material components: 28% hydroxyl-modified polysiloxane, 9% glycidylamine epoxy resin, 9% bisphenol F epoxy resin, 8% silicon-containing elastic particles, 5% nano-silica, 12% 3-aminopropyltriethoxysilane, 0.6% film-forming aid, and 28.4% solvent.

[0042] Example 4: The difference between this example and Example 1 is that: a tunnel ceramic coating suitable for high-altitude areas, by mass percentage, includes the following raw material components: 25% hydroxyl-modified polysiloxane, 7% glycidylamine epoxy resin, 7% bisphenol F epoxy resin, 5% silicon-containing elastic particles, 5% nano-silica, 8% 3-aminopropyltriethoxysilane, 0.5% film-forming aid, and 42.5% solvent.

[0043] Example 5: The difference between this example and Example 1 is that the preparation method of the hydroxyl-modified polysiloxane is as follows:

[0044] A1. Add 545g of methyldiethoxysilane and 12g of allyl alcohol to a three-necked flask equipped with a stirrer, then add 0.055g of platinum dioxide. Stir well at room temperature, then slowly heat to 90℃ and react for 20h. Filter under vacuum and distill under reduced pressure to remove impurities and low-boiling substances to obtain a colorless and transparent liquid, which is the intermediate.

[0045] A2. The intermediate obtained in A1 was added dropwise to a 40% sulfuric acid solution (volume fraction). The mass ratio of the intermediate to the 40% sulfuric acid solution was 1:3. The dropwise addition rate of the intermediate was 1 mL / min. After the addition was complete, the mixture was reacted at 35°C for 1 h. The mixture was then filtered and repeatedly washed with distilled water until the pH of the washing solution was 7. The mixture was then dried in a vacuum drying oven at 60°C for 1 day to obtain a white powder, which is the hydroxyl-modified polysiloxane.

[0046] Example 6: The difference between this example and Example 1 is that the preparation method of the hydroxyl-modified polysiloxane is as follows:

[0047] A1. Add 545g of methyldiethoxysilane and 12g of allyl alcohol to a three-necked flask equipped with a stirrer, then add 0.065g of platinum dioxide. Stir well at room temperature, then slowly heat to 90℃ and react for 20h. Filter under vacuum and distill under reduced pressure to remove impurities and low-boiling substances to obtain a colorless and transparent liquid, which is the intermediate.

[0048] A2. The intermediate obtained in A1 was added dropwise to a 40% sulfuric acid solution (volume fraction). The mass ratio of the intermediate to the 40% sulfuric acid solution was 1:4. The dropwise addition rate of the intermediate was 1.2 mL / min. After the addition was complete, the mixture was reacted at 35°C for 1 h. The mixture was then filtered and repeatedly washed with distilled water until the pH of the washing solution was 7. The mixture was then dried in a vacuum drying oven at 60°C for 1 day to obtain a white powder, which is the hydroxyl-modified polysiloxane.

[0049] Example 7: The difference between this example and Example 1 is that the preparation method of the silicon-containing elastic particles is as follows: Take 50g of phenyl silicone resin toluene solution with a solid content of 50%, add it to a three-necked flask, stir, add 25g of polydimethylsiloxane, reflux at 100℃ for 1h, remove the solvent under reduced pressure, cool to room temperature, add 0.4g of catalyst and 3g of crosslinking agent tetraethyl orthosilicate, stir evenly, remove air bubbles under vacuum, pour into a mold, cure at room temperature for 14d, cut, grind, and the silicon-containing elastic particles are obtained.

[0050] The catalyst comprises chelated type 200 titanate and dibutyltin dilaurate, with a mass ratio of 1:1.

[0051] The preparation method of a phenyl silicone resin toluene solution with a solid content of 50% is as follows: 80g of tetraethyl orthosilicate, 24.5g of hexamethyldisiloxane, and 5g of diphenyldimethoxysilane are added to a three-necked flask. 22.7g of deionized water, 8g of ethanol, and 6.5g of concentrated hydrochloric acid are added dropwise while stirring. The temperature is controlled at 28℃. After the addition is complete, stirring is continued for 30min. The temperature is then raised to 75℃ and refluxed for 3.5h. Toluene is added for extraction, NaHCO3 is added for neutralization, and the pH of the system is adjusted to 8-9 with NaOH solution. The reaction is carried out for 45min, followed by dehydroxylation treatment. Hydrochloric acid is added for neutralization, some ethanol is distilled off, and the generated salt is filtered out. The solution is washed three times with water, dried with anhydrous calcium chloride, and then concentrated to a solid content of 50%.

[0052] Example 8: The difference between this example and Example 1 is that the preparation method of the silicon-containing elastic particles is as follows: Take 50g of phenyl silicone resin toluene solution with a solid content of 55%, add it to a three-necked flask, stir, add 40g of polydimethylsiloxane, reflux at 100℃ for 1h, remove the solvent under reduced pressure, cool to room temperature, add 0.6g of catalyst and 5g of crosslinking agent tetraethyl orthosilicate, stir evenly, remove air bubbles under vacuum, pour into a mold, cure at room temperature for 14d, cut, grind, and the silicon-containing elastic particles are obtained.

[0053] The catalyst comprises chelated type 200 titanate and dibutyltin dilaurate, with a mass ratio of 1:2.

[0054] The preparation method of phenyl silicone resin toluene solution with a solid content of 55% is as follows: 80g of tetraethyl orthosilicate, 24.5g of hexamethyldisiloxane and 5g of diphenyldimethoxysilane are added to a three-necked flask. 22.7g of deionized water, 8g of ethanol and 6.5g of concentrated hydrochloric acid are added dropwise while stirring. The temperature is controlled at 28℃. After the addition is complete, stirring is continued for 30min. The temperature is raised to 75℃ and refluxed for 3.5h. Toluene is added for extraction, NaHCO3 is added for neutralization, and the pH of the system is adjusted to 8-9 with NaOH solution. The reaction is carried out for 45min, followed by dehydroxylation treatment. Hydrochloric acid is added for neutralization, some ethanol is evaporated, and the generated salt is filtered out. The solution is washed three times with water, dried with anhydrous calcium chloride, and then concentrated to a solid content of 55%.

[0055] Comparative Example 1: The difference between this comparative example and Example 1 is that the hydroxyl-modified polysiloxane was replaced with commercially available polydimethylsiloxane, purchased from Foshan Sirunbao Biotechnology Co., Ltd.

[0056] Specifically, a tunnel ceramic coating suitable for high-altitude areas comprises, by mass percentage, the following raw material components: 25% polydimethylsiloxane, 7% glycidylamine epoxy resin, 7% bisphenol F epoxy resin, 6% silicon-containing elastic particles, 4% nano-silica, 10% 3-aminopropyltriethoxysilane, 0.4% film-forming aid, and 40.6% solvent.

[0057] Comparative Example 2: The difference between this comparative example and Example 1 is that the glycidylamine type epoxy resin is replaced with bisphenol F type epoxy resin.

[0058] Specifically, a tunnel ceramic coating suitable for high-altitude areas comprises, by mass percentage, the following raw material components: 25% hydroxyl-modified polysiloxane, 14% bisphenol F type epoxy resin, 6% silicon-containing elastic particles, 4% nano-silica, 10% 3-aminopropyltriethoxysilane, 0.4% film-forming aid, and 40.6% solvent.

[0059] Comparative Example 3: The difference between this comparative example and Example 1 is that the bisphenol F type epoxy resin is replaced with glycidylamine type epoxy resin.

[0060] Specifically, a tunnel ceramic coating suitable for high-altitude areas comprises, by mass percentage, the following raw material components: 25% hydroxyl-modified polysiloxane, 14% glycidylamine epoxy resin, 6% silicon-containing elastic particles, 4% nano-silica, 10% 3-aminopropyltriethoxysilane, 0.4% film-forming aid, and 40.6% solvent.

[0061] Comparative Example 4: The difference between this comparative example and Example 1 is that the hydroxyl-modified polysiloxane is replaced with commercially available polydimethylsiloxane, and the glycidylamine type epoxy resin is replaced with bisphenol F type epoxy resin.

[0062] Specifically, a tunnel ceramic coating suitable for high-altitude areas comprises, by mass percentage, the following raw material components: 25% polydimethylsiloxane, 14% bisphenol F type epoxy resin, 6% silicon-containing elastic particles, 4% nano-silica, 10% 3-aminopropyltriethoxysilane, 0.4% film-forming aid, and 40.6% solvent.

[0063] Comparative Example 5: The difference between this comparative example and Example 1 is that the hydroxyl-modified polysiloxane is replaced with commercially available polydimethylsiloxane, and the bisphenol F type epoxy resin is replaced with glycidylamine type epoxy resin.

[0064] Specifically, a tunnel ceramic coating suitable for high-altitude areas comprises, by mass percentage, the following raw material components: 25% polydimethylsiloxane, 14% glycidylamine epoxy resin, 6% silicon-containing elastic particles, 4% nano-silica, 10% 3-aminopropyltriethoxysilane, 0.4% film-forming aid, and 40.6% solvent.

[0065] Comparative Example 6: The difference between this comparative example and Example 1 is that in the preparation of the silicon-containing elastic particles, the 52% phenyl silicone resin toluene solution was replaced with a 52% silicone resin toluene solution. The silicone resin (SJ-804) was purchased directly from Shanghai Kaiyin Chemical Co., Ltd.

[0066] Specifically, the preparation method of silicon-containing elastic particles is as follows: Take 50g of a 52% solid content silicone resin toluene solution, add it to a three-necked flask, stir, add 35g of polydimethylsiloxane, reflux at 100℃ for 1h, remove the solvent under reduced pressure, cool to room temperature, add 0.5g of catalyst and 4g of crosslinking agent tetraethyl orthosilicate, stir evenly, remove air bubbles under vacuum, pour into a mold, cure at room temperature for 14d, cut, and grind to obtain silicon-containing elastic particles.

[0067] Comparative Example 7: The difference between this comparative example and Example 1 is that the silicon-containing elastic particles are removed.

[0068] Specifically, a tunnel ceramic coating suitable for high-altitude areas comprises, by mass percentage, the following raw material components: 25% hydroxyl-modified polysiloxane, 7% glycidylamine epoxy resin, 7% bisphenol F epoxy resin, 4% nano silica, 10% 3-aminopropyltriethoxysilane, 0.4% film-forming aid, and 46.6% solvent.

[0069] Comparative Example 8: The difference between this comparative example and Example 1 is that the silicon-containing elastic particles are removed, the hydroxyl-modified polysiloxane is replaced with commercially available polydimethylsiloxane, and the glycidylamine type epoxy resin is replaced with bisphenol F type epoxy resin.

[0070] Specifically, a tunnel ceramic coating suitable for high-altitude areas comprises, by mass percentage, the following raw material components: 25% polydimethylsiloxane, 14% bisphenol F type epoxy resin, 4% nano silica, 10% 3-aminopropyltriethoxysilane, 0.4% film-forming aid, and 46.6% solvent.

[0071] Comparative Example 9: The difference between this comparative example and Example 1 is that the silicon-containing elastic particles were removed, the hydroxyl-modified polysiloxane was replaced with commercially available polydimethylsiloxane, and the bisphenol F type epoxy resin was replaced with glycidylamine type epoxy resin.

[0072] Specifically, a tunnel ceramic coating suitable for high-altitude areas comprises, by mass percentage, the following raw material components: 25% polydimethylsiloxane, 14% glycidylamine epoxy resin, 4% nano silica, 10% 3-aminopropyltriethoxysilane, 0.4% film-forming aid, and 46.6% solvent.

[0073] Test example: Test item: The hardness and adhesion of the coating were measured before and after being placed in an environment with a large temperature difference (alternating between 70℃ and -30℃ every 12 hours) for 14 days (24 hours a day).

[0074] Test subjects: the vitrified coatings prepared in Examples 1-8 and the vitrified coatings prepared in Comparative Examples 1-9.

[0075] Test standards: Hardness - GB / T 6739-2006; Adhesion - GB / T 9286-2021.

[0076] Experimental results: see Table 1.

[0077] Table 1. Test data of Examples 1-8 and Comparative Examples 1-9

[0078]

[0079]

[0080] Results Analysis: Analyze Examples 1-8 and combine the data in Table 1 and... Figure 1-2 It can be seen that the porcelain coating prepared by the present invention has a hardness of up to 8H or higher and an adhesion of up to grade 0. Furthermore, after being placed in an environment with a large temperature difference (alternating between 70℃ and -30℃ every 12 hours) for 14 days (24 hours a day), the hardness and adhesion are basically unchanged, indicating that the porcelain coating prepared by the present invention can maintain high hardness and high adhesion for a long time in an environment with a large temperature difference.

[0081] Analysis of Example 1 and Comparative Examples 1-9, combined with data from Table 1 and Figure 1-2 It can be seen that hydroxyl-modified polysiloxane, bisphenol F type epoxy resin, glycidyl amine type epoxy resin, and silicon-containing elastic particles made from phenyl silicone resin all play an essential role in maintaining the long-term performance of the ceramic coating, and they can work synergistically with each other.

[0082] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0083] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A tunnel vitrification coating suitable for high-altitude areas, characterized in that, By mass percentage, it consists of the following raw material components: 20-28% hydroxyl-modified polysiloxane, 5-9% glycidylamine epoxy resin, 5-9% bisphenol F epoxy resin, 4-8% silicon-containing elastic particles, 3-5% nano silica, 8-12% 3-aminopropyltriethoxysilane, 0.3-0.6% film-forming aid, and the balance being solvent; The preparation method of the silicon-containing elastic particles is as follows: Take 50g of phenyl silicone resin toluene solution with a solid content of 50-55%, add it to a three-necked flask, stir, add 25-40g of polydimethylsiloxane, reflux at 100℃ for 1h, remove the solvent under reduced pressure, cool to room temperature, add 0.4-0.6g of catalyst and 3-5g of crosslinking agent tetraethyl orthosilicate, stir well, remove bubbles under vacuum, pour into a mold, cure at room temperature for 14d, cut, and grind to obtain silicon-containing elastic particles.

2. The tunnel vitrifying coating suitable for high-altitude areas according to claim 1, characterized in that, The preparation method of the hydroxyl-modified polysiloxane is as follows: A1. Add 545g of methyldiethoxysilane and 12g of allyl alcohol to a three-necked flask, then add 0.055-0.065g of platinum dioxide, stir evenly at room temperature, heat to 90℃, react for 20h, filter, and distill under reduced pressure to obtain a colorless and transparent liquid as an intermediate. A2. Add the intermediate obtained in A1 dropwise to a 40% sulfuric acid solution with a mass ratio of intermediate to 40% sulfuric acid solution of 1:(3-4). React at 35℃ for 1 hour, filter, and wash repeatedly with distilled water until the pH of the washing solution is 7. Dry at 60℃ for 24 hours to obtain hydroxyl-modified polysiloxane.

3. The tunnel vitrifying coating suitable for high-altitude areas according to claim 2, characterized in that, In A2, the intermediate is added at a rate of 1-1.2 mL / min.

4. The tunnel vitrifying coating suitable for high-altitude areas according to claim 1, characterized in that, The preparation method of the phenyl silicone resin toluene solution with a solid content of 50-55% is as follows: 80g of tetraethyl orthosilicate, 24.5g of hexamethyldisiloxane and 5g of diphenyldimethoxysilane are added to a three-necked flask, stirred, and 22.7g of deionized water, 8g of ethanol and 6.5g of concentrated hydrochloric acid are added dropwise. The temperature is 25-30℃, stirred for 30min, heated to 75℃, and refluxed for 3.5h. Toluene is added for extraction, NaHCO3 is added for neutralization, the pH of the system is adjusted to 8-9 with NaOH solution, the reaction is carried out for 45min, hydrochloric acid is added for neutralization, some ethanol is evaporated, filtered, the solution is washed three times with water, dried with anhydrous calcium chloride, and the solution is concentrated to a solid content of 50-55%.

5. The tunnel vitrifying coating suitable for high-altitude areas according to claim 1, characterized in that, The catalyst comprises chelated type 200 titanate and dibutyltin dilaurate, and the mass ratio of the two is 1:(1-2).

6. The tunnel vitrifying coating suitable for high-altitude areas according to claim 1, characterized in that, The solvent includes one or a mixture of at least two of acetone, ethyl acetate, xylene, and dichloromethane.

7. The tunnel vitrifying coating suitable for high-altitude areas according to claim 1, characterized in that, The film-forming aids include propylene glycol butyl ether and / or propylene glycol methyl ether acetate.

8. A method for preparing a tunnel vitrifying coating suitable for high-altitude areas as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Mix hydroxyl-modified polysiloxane, glycidylamine epoxy resin, bisphenol F epoxy resin, silicon-containing elastic particles and nano-silica to obtain component A. S2. Mix 3-aminopropyltriethoxysilane, film-forming aid and solvent to obtain component B; S3. Mix component A and component B thoroughly to obtain a tunnel ceramic coating suitable for high-altitude areas.

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