Low-resistance bonding ceramic tube coating material and coating method thereof

Abstract

The invention discloses a low-resistance bonding ceramic tube coating material and a coating method thereof, and relates to the field of steel tube coatings, and the low-resistance bonding ceramic tube coating material comprises a bottom layer material, a ceramic hybrid layer material and a hydrophobic functional material. According to the low-resistance bonding ceramic tube coating material and the coating method thereof, through coating of the bottom layer material, the ceramic hybrid layer material and the hydrophobic functional material, a coated steel tube can have natural resistance to corrosive media such as acid, alkali and salts, and even under the long-term complex working condition, the corrosion resistance of the steel tube is greatly improved. The roughness of the inner wall of the pipe can still be stably maintained within the range of 20-100 microns, the surface smoothness is 5-20 times that of a traditional pipe in the initial service stage, the friction coefficient of fluid and the pipe wall can be greatly reduced, the fluid can more easily form a laminar flow state, energy loss is effectively reduced, and the service life of the pipe is prolonged. And the composite material can be applied to the fields with extremely high requirements on energy consumption and stability, such as ships, airplanes, high-speed rails, ocean engineering, petrochemical engineering, sewage treatment, long-distance water delivery and the like.

Description

Technical Field

[0001] The invention relates to the field of steel pipe coatings, and in particular to a low-resistance bonded ceramic pipe coating material and a coating method thereof. Background Art

[0002] In the field of fluid transportation, flow resistance is the core factor affecting system energy consumption and operating efficiency. During long-term use, the inner wall roughness of traditional steel pipes increases exponentially due to medium corrosion, erosion and wear. Data monitoring shows that the average roughness of the inner wall of traditional pipes used for 5 years can reach 200-300μm, and a clear micro-concave and convex structure has been formed; as the service life extends to 10 years, the value climbs to 300-700μm, and gully-shaped corrosion pits gradually form on the surface; and when the service time reaches 15 years, the inner wall roughness even soars to 2000-4000μm. The rough surface greatly increases the contact area between the fluid and the pipe wall, resulting in increased fluid turbulence and the conveying resistance can be increased several times, which directly causes increased pumping energy consumption and decreased conveying efficiency.

[0003] Based on the above, it can be seen that traditional pipes cannot be well used in fields such as ships, aircraft, high-speed railways, marine engineering, petrochemicals, sewage treatment, long-distance water transportation, etc., which have extremely high requirements on energy consumption and stability.

[0004] Therefore, it is necessary to propose a low-resistance bonding ceramic tube coating material and a coating method thereof to solve the above problems. Summary of the Invention

[0005] The main purpose of the present invention is to provide a low-resistance bonding ceramic tube coating material and a coating method thereof, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A low-resistance bonding ceramic tube coating material, comprising a base material, a ceramic hybrid layer material, and a hydrophobic functional material, wherein the base material comprises 35%-40% nanoparticles by mass. Sol, 4%-5% silane coupling agent, 25%-30% ethanol, 30%-35% deionized water; The ceramic hybrid layer material comprises, by mass percentage, 20%-25% of industrial-grade active magnesium oxide, 45%-50% of modified sulphoaluminate cement, 8%-10% of acrylic emulsion, and 20%-25% of deionized water; The hydrophobic functional material comprises 85%-90% heptadecafluorodecyltriethoxysilane, 5%-8% nano Aerogel, 0.5%-1% organotin catalyst, 4%-10% isopropyl alcohol.

[0007] Preferably, the nano The solid content of the sol is 40%, the particle size is 10-20nm, and the pH is 9.0-10.5; the silane coupling agent is KH-560; the industrial grade active magnesium oxide ≥35%, activity ≥60s; the solid content of the acrylic emulsion is 50%; the water-cement ratio of the ceramic hybrid layer material is 0.26-0.28, wherein the water includes deionized water and acrylic emulsion, the ash includes modified sulphoaluminate cement, the fluorine content of the heptadecafluorodecyl triethoxysilane is ≥28%; the nano The particle size of the aerogel is 30-50 nm; the ratio of the industrial-grade active magnesium oxide to the modified sulphoaluminate cement is 1:2.5-3.0.

[0008] Preferably, the base material accounts for 15%-18% of the total material mass, the ceramic hybrid layer material accounts for 70%-75% of the total material mass, and the hydrophobic functional material accounts for 10%-12% of the total material mass. The base material is used to directly contact the substrate of the steel pipe and to fill sandblasting pits. The ceramic hybrid layer material serves as the main protective layer of the steel pipe and is used to bear mechanical loads. The hydrophobic functional material serves as the outermost functional layer of the steel pipe and is used to reduce flow resistance.

[0009] Preferably, the bottom layer material comprises 38.2% nanoparticles by mass. Sol, 4.5% silane coupling agent, 27.3% ethanol, 30% deionized water; The ceramic hybrid layer material comprises, by mass percentage, 22.5% of industrial-grade active magnesium oxide, 52.5% of modified sulphoaluminate cement, 8.0% of acrylic emulsion, and 17.0% of deionized water; The hydrophobic functional material includes 85.7% of heptadecafluorodecyltriethoxysilane, 7.1% of nano aerogel, 0.7% organotin catalyst, 6.5% isopropyl alcohol.

[0010] Preferably, the bottom layer material comprises 38.5% nanoparticles by mass. Sol, 4.2% silane coupling agent, 26.5% ethanol, 30.8% deionized water; The ceramic hybrid layer material comprises, by mass percentage, 24% industrial-grade active magnesium oxide, 47% modified sulphoaluminate cement, 10% acrylic emulsion, and 19% deionized water; The hydrophobic functional material comprises 90% heptadecafluorodecyltriethoxysilane, 5.5% nano aerogel, 0.5% organotin catalyst, 4% isopropyl alcohol.

[0011] Preferably, the bottom layer material comprises 37% nanoparticles by mass. Sol, 4.8% silane coupling agent, 28% ethanol, 30.2% deionized water; The ceramic hybrid layer material comprises, by mass percentage, 25% industrial-grade active magnesium oxide, 46% modified sulphoaluminate cement, 9% acrylic emulsion, and 20% deionized water; The hydrophobic functional material includes 88% heptadecafluorodecyltriethoxysilane, 6% nano aerogel, 0.6% organotin catalyst, 5.4% isopropyl alcohol.

[0012] A coating method for a low-resistance bonding ceramic tube coating material comprises the following steps: S1: Sandblasting: Use compressed air to blow the inner and outer surfaces of the steel pipe to remove loose particles. Use a sandblasting machine with brown corundum abrasive to sandblast the steel pipe to remove oxides and dirt on the surface of the steel pipe. The pressure of the sandblasting machine is controlled at 0.65 MPa. After sandblasting, the surface roughness Ra value of the steel pipe is tested. It is qualified if it is 55 microns. S2: Immerse the sandblasted steel pipe in activation solution at 40°C for 15 minutes. Rinse the steel pipe surface with deionized water to remove residual acid. Finally, dry the steel pipe at 120°C to ensure it is completely dry. S3: coating of the bottom material, mixed with nanomaterials by mass percentage Sol, silane coupling agent, ethanol, and deionized water are mechanically stirred for 30 minutes at a speed of 600 revolutions per minute. After the stirring is completed, it is allowed to stand for 15 minutes to defoam. The steel pipe is sprayed with the first coat of spraying using an airless sprayer. The thickness of the first coat of spraying wet film is 40 to 50 microns. After the surface is dried for 10 minutes at an ambient temperature of 25°C, the second coat of spraying is carried out. The cumulative thickness of the spraying is 80 to 90 microns. After the second coat of spraying is completed, it is cured for 24 hours at 40°C and a relative humidity of 60%. S4: coating of ceramic hybrid layer material, preparing industrial-grade active magnesium oxide, modified sulfoaluminate cement, acrylic emulsion, and deionized water according to mass percentage, and mixing them to form ceramic hybrid layer material slurry. Using centrifugal coating process, preheat the steel pipe to 60°C, with an initial speed of 100 revolutions per minute, so that the ceramic hybrid layer material slurry is evenly spread on the surface of the steel pipe; then, through compaction speed of 500 revolutions per minute, maintained for 8 minutes, the thickness of the ceramic hybrid layer material slurry is controlled to 900 microns, and then the coating is completed. In the initial setting stage, the steel pipe is cured at 25°C for 12 hours to complete the magnesium oxide ion bonding; in the final setting stage, the steel pipe is cured at 75°C for 6 hours to generate a ceramic phase; S5: coating of hydrophobic functional materials, prepare heptadecafluorodecyltriethoxysilane, nano Aerogel, organotin catalyst, and isopropyl alcohol are mixed and coated on steel pipes using a rotary cup electrostatic spray gun with a charging voltage of 50 kV, an atomization pressure of 0.2 MPa, a gun speed of 0.8 m / s, and a film thickness of 150 microns. After spraying, heat curing is immediately performed with a 120°C hot air circulation for ten minutes. According to FTIR or swelling method tests, a cross-linking density of ≥1.5×10⁻ is formed. 4 mol / cm³ cross-linked network, based on which the steel pipe is coated.

[0013] Preferably, in S2, the activation solution is a 10% oxalic acid solution, and 3% hexamethylenetetramine is added as a corrosion inhibitor.

[0014] Preferably, in S5, after the steel pipe is coated, it is cured, specifically at 30 degrees Celsius and 75% relative humidity for seven days.

[0015] Compared with the prior art, the present invention provides a low-resistance bonding ceramic tube coating material and a coating method thereof, which has the following beneficial effects: This low-resistance bonded ceramic tube coating material and its coating method, through the coating of base material, ceramic hybrid layer material and hydrophobic functional material, make the coated steel pipe naturally resistant to corrosive media such as acids, alkalis, and salts. Even under long-term complex working conditions, the inner wall roughness can still be stably maintained in the range of 20-100μm, and the surface smoothness is equivalent to 5-20 times that of traditional pipes in the early stage of service. Secondly, the nearly mirror-like microstructure greatly reduces the friction coefficient between the fluid and the pipe wall, making it easier for the fluid to form a laminar state, effectively reducing energy loss.

[0016] The low-resistance bonded ceramic tube coating material and the coating method thereof can utilize the low surface energy material characteristics through the hydrophobic functional material to build a stable air film between the fluid and the inner lining layer. This air film makes the contact angle between the fluid and the inner lining surface greater than 90°, forming a typical hydrophobic interface effect, just like laying a layer of air cushion between the fluid and the pipe wall, effectively blocking the direct friction between the fluid and the solid surface, thereby further reducing the flow resistance on the inner lining surface. Therefore, compared with traditional steel pipes under the same working conditions, the steel pipe coated by the present invention can significantly improve the fluid transportation efficiency and extend the service life of the pipeline. It is particularly suitable for fields with extremely high requirements on energy consumption and stability, such as ships, aircraft, high-speed railways, marine engineering, petrochemicals, sewage treatment, and long-distance water transportation.

[0017] The low-resistance bonded ceramic tube coating material and coating method thereof, as the coating is formed, complex chemical reactions occur between the magnesium element in the coating, the silicon element in the cement, and the organic material. These reactions cause the coating to gradually solidify and transform into a high-strength ceramic material.

[0018] This low-resistance bonded ceramic tube coating material and its coating method can solve the brittleness problem of traditional epoxy through the coated base material, while reducing thermal conductivity and solving the problem of protective layer failure caused by metal pipe welding; through the coated ceramic hybrid layer material, it can break through the limitations of a single cement-based material and achieve both rigidity and flexibility; through the coated hydrophobic functional material, it can achieve water repellency and drag reduction, improve the water resistance and corrosion resistance of the middle layer, and the multi-layer synergistic coating can improve the interlayer bonding strength through interfacial chemical bonding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a trend diagram of the change of the inner wall roughness of the steel pipe of the present invention and the traditional steel pipe over time.

[0020] In the figure: the bonding ceramic is the coated steel pipe of Example 1. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] A low-resistance bonding ceramic tube coating material and a coating method thereof, a low-resistance bonding ceramic tube coating material, comprising a base material, a ceramic hybrid layer material, and a hydrophobic functional material, wherein the base material comprises 35%-40% nanoparticles by mass. Sol, 4%-5% silane coupling agent, 25%-30% ethanol, 30%-35% deionized water; The ceramic hybrid layer material comprises, by mass percentage, 20%-25% of industrial-grade active magnesium oxide, 45%-50% of modified sulphoaluminate cement, 8%-10% of acrylic emulsion, and 20%-25% of deionized water; The hydrophobic functional material includes 85%-90% heptadecafluorodecyltriethoxysilane, 5%-8% nano Aerogel, 0.5%-1% organotin catalyst, 4%-10% isopropyl alcohol; nanometer The solid content of the sol is 40%, the particle size is 10-20nm, and the pH is 9.0-10.5; the silane coupling agent is KH-560; the industrial grade active magnesium oxide ≥35%, activity ≥60s; solid content of acrylic emulsion is 50%; water-cement ratio of ceramic hybrid layer material is 0.26-0.28, wherein water includes deionized water and acrylic emulsion, and ash includes modified sulphoaluminate cement; fluorine content of heptadecafluorodecyl triethoxysilane is ≥28; nano The particle size of the aerogel is 30-50 nm; the ratio of industrial-grade activated magnesium oxide to modified sulphoaluminate cement is 1:2.5-3.0; The base material accounts for 15%-18% of the total material mass, the ceramic hybrid layer material accounts for 70%-75% of the total material mass, and the hydrophobic functional material accounts for 10%-12% of the total material mass. The base material is used to directly contact the substrate of the steel pipe and to fill the sandblasting pits. The ceramic hybrid layer material serves as the main protective layer of the steel pipe to bear the mechanical load. The hydrophobic functional material serves as the outermost functional layer of the steel pipe to reduce the flow resistance. 35%-40% of the nano- The sol is used to ensure anchoring strength, the water-cement ratio of the ceramic hybrid layer material is used to balance reactivity and strength, and 85%-90% heptadecafluorodecyltriethoxysilane is used to maintain superhydrophobicity; A coating method for a low-resistance bonding ceramic tube coating material comprises the following steps: S1: Sandblasting: Use compressed air to blow the inner and outer surfaces of the steel pipe to remove loose particles. Use a sandblasting machine with brown corundum abrasive to sandblast the steel pipe. The Mohs hardness of brown corundum is not less than 8, and the particle size standard is G16. It is used to remove oxides and dirt on the surface of the steel pipe. The pressure of the sandblasting machine is controlled at 0.65 MPa to ensure that the abrasive impact force is sufficient to remove rust without damaging the substrate. After sandblasting, the surface roughness Ra value of the steel pipe is tested. It is qualified if it is 55 microns. S2: Immerse the sandblasted steel pipe in activation solution at 40°C for 15 minutes. Rinse the steel pipe surface with deionized water to remove residual acid. Finally, dry the steel pipe at 120°C to ensure that it is completely dry. The activation solution is a 10% oxalic acid solution with 3% hexamethylenetetramine added as a corrosion inhibitor. S3: coating of the bottom material, mixed with nanomaterials by mass percentage Sol, silane coupling agent, ethanol, and deionized water are mechanically stirred for 30 minutes at a speed of 600 revolutions per minute. After the stirring is completed, it is allowed to stand for 15 minutes to defoam. The steel pipe is sprayed with the first coat of spraying using an airless sprayer. The thickness of the first coat of spraying wet film is 40 to 50 microns. After the surface is dried for 10 minutes at an ambient temperature of 25°C, the second coat of spraying is carried out. The cumulative thickness of the spraying is 80 to 90 microns. After the second coat of spraying is completed, it is cured for 24 hours at 40°C and a relative humidity of 60%. S4: Coating of ceramic hybrid layer material: prepare industrial grade active magnesium oxide, modified sulfoaluminate cement, acrylic emulsion and deionized water according to mass percentage, mix them to form ceramic hybrid layer material slurry, adopt centrifugal coating process, preheat the steel pipe to 60℃, and the initial speed is 100 rpm, so that the ceramic hybrid layer material slurry is evenly spread on the surface of the steel pipe; then, the speed is 500 rpm, maintained for 8 minutes, and the thickness of the ceramic hybrid layer material slurry is controlled to 900 microns to complete the coating. In the initial setting stage, the steel pipe is cured at 25℃ for 12 hours to complete the magnesium oxide ion bonding; in the final setting stage, the steel pipe is cured at 75℃ for 6 hours to form ceramic The porcelain phase is specifically as follows: during the 25°C curing stage, the industrial-grade active magnesium oxide in the ceramic hybrid layer material hydrolyzes in contact with water, releasing highly active magnesium ions. At the same time, anions such as silicate and aluminate in the modified sulfoaluminate cement are tightly bound to the highly active magnesium ions through electrostatic adsorption, forming a stable ionic bond network structure. Based on this, the magnesium oxide ion bonding is completed. When the temperature is raised to 75°C for curing, the ionic bond network is reconstructed under thermal activation, and the highly active magnesium ions react with silicate to form a magnesium silicate crystal phase. At the same time, aluminate participates in the formation of a spinel structure, and the organic carbon chains produced by the decomposition of the acrylate emulsion fill the lattice gaps, enhancing toughness. The density of the ceramic phase inhibits surface roughening. S5: coating of hydrophobic functional materials, prepare heptadecafluorodecyltriethoxysilane, nano Aerogel, organotin catalyst, and isopropyl alcohol are mixed and coated on steel pipes using a rotary cup electrostatic spray gun with a charging voltage of 50 kV, an atomization pressure of 0.2 MPa, a gun speed of 0.8 m / s, and a film thickness of 150 microns. After spraying, heat curing is immediately performed with a 120°C hot air circulation for ten minutes. According to FTIR or swelling method tests, a cross-linking density of ≥1.5×10⁻ is formed. 4 mol / cm³ cross-linked network, based on which the steel pipe coating is completed; After the steel pipe is coated, it is cured, specifically at 30 degrees Celsius and 75% relative humidity for seven days; after curing, the strength development of the steel pipe is monitored: the compressive strength is 50 to 55 MPa on the third day, and 75 to 80 MPa on the seventh day; the thickness is tested using an electromagnetic induction thickness gauge with an accuracy of plus or minus five microns, in accordance with ISO2808; the porosity is tested using a high-voltage electric spark test with a voltage of fifteen kilovolts, and the qualified standard is no breakdown point; hydrophobic performance verification: the contact angle test uses a five-microliter water droplet, and the result is greater than one hundred and fifty degrees; the friction coefficient test result is 0.015, in accordance with ASTMD1894.

[0023] Example 1: A low resistance bonding ceramic tube coating material, the bottom material comprises 38.2% nano Sol, 4.5% silane coupling agent, 27.3% ethanol, 30% deionized water; The ceramic hybrid layer material comprises, by mass percentage, 22.5% of industrial-grade active magnesium oxide, 52.5% of modified sulphoaluminate cement, 8.0% of acrylic emulsion, and 17.0% of deionized water; The hydrophobic functional material includes 85.7% heptadecafluorodecyltriethoxysilane, 7.1% nano aerogel, 0.7% organotin catalyst, 6.5% isopropyl alcohol; nanometer The solid content of the sol is 40%, the particle size is 10-20nm, and the pH is 9.0-10.5; the silane coupling agent is KH-560; the industrial grade active magnesium oxide ≥35%, activity ≥60s; solid content of acrylic emulsion is 50%, acrylic emulsion is styrene acrylic emulsion; water-cement ratio of ceramic hybrid layer material is 0.26-0.28, wherein water includes deionized water and acrylic emulsion, and ash includes modified sulphoaluminate cement; fluorine content of heptadecafluorodecyl triethoxysilane is ≥28; nano The particle size of aerogel is 30-50nm, nano The aerogel is modified with hexamethyldisilazane; the ratio of industrial-grade active magnesium oxide to modified sulphoaluminate cement is 1:2.5-3.0; the modified sulphoaluminate cement is modified by adding 5%-8% styrene-butadiene emulsion; The base material accounts for 15%-18% of the total material mass, the ceramic hybrid layer material accounts for 70%-75% of the total material mass, and the hydrophobic functional material accounts for 10%-12% of the total material mass. The base material is used to directly contact the substrate of the steel pipe and to fill the sandblasting pits. The ceramic hybrid layer material serves as the main protective layer of the steel pipe to bear the mechanical load. The hydrophobic functional material serves as the outermost functional layer of the steel pipe to reduce the flow resistance. 35%-40% of the nano- The sol is used to ensure anchoring strength, the water-cement ratio of the ceramic hybrid layer material is used to balance reactivity and strength, and 85%-90% heptadecafluorodecyltriethoxysilane is used to maintain superhydrophobicity; A coating method for a low-resistance bonding ceramic tube coating material comprises the following steps: S1: Sandblasting: Use compressed air to blow the inner and outer surfaces of the steel pipe to remove loose particles. Use a sandblasting machine with brown corundum abrasive to sandblast the steel pipe. The Mohs hardness of brown corundum is not less than 8, and the particle size standard is G16. It is used to remove oxides and dirt on the surface of the steel pipe. The pressure of the sandblasting machine is controlled at 0.65 MPa to ensure that the abrasive impact force is sufficient to remove rust without damaging the substrate. After sandblasting, the surface roughness Ra value of the steel pipe is tested. It is qualified if it is 55 microns. S2: Immerse the sandblasted steel pipe in activation solution at 40°C for 15 minutes. Rinse the steel pipe surface with deionized water to remove residual acid. Finally, dry the steel pipe at 120°C to ensure that it is completely dry. The activation solution is a 10% oxalic acid solution with 3% hexamethylenetetramine added as a corrosion inhibitor. S3: coating of the bottom material, mixed with nanomaterials by mass percentage Sol, silane coupling agent, ethanol, and deionized water are mechanically stirred for 30 minutes at a speed of 600 revolutions per minute. After the stirring is completed, it is allowed to stand for 15 minutes to defoam. The steel pipe is sprayed with the first coat of spraying using an airless sprayer. The thickness of the first coat of spraying wet film is 40 to 50 microns. After the surface is dried for 10 minutes at an ambient temperature of 25°C, the second coat of spraying is carried out. The cumulative thickness of the spraying is 80 to 90 microns. After the second coat of spraying is completed, it is cured for 24 hours at 40°C and a relative humidity of 60%. S4: coating of ceramic hybrid layer material, preparing industrial-grade active magnesium oxide, modified sulfoaluminate cement, acrylic emulsion, and deionized water according to mass percentage, and mixing them to form ceramic hybrid layer material slurry. Using centrifugal coating process, preheat the steel pipe to 60°C, with an initial speed of 100 revolutions per minute, so that the ceramic hybrid layer material slurry is evenly spread on the surface of the steel pipe; then, through compaction speed of 500 revolutions per minute, maintained for 8 minutes, the thickness of the ceramic hybrid layer material slurry is controlled to 900 microns, and then the coating is completed. In the initial setting stage, the steel pipe is cured at 25°C for 12 hours to complete the magnesium oxide ion bonding; in the final setting stage, the steel pipe is cured at 75°C for 6 hours to generate a ceramic phase; S5: coating of hydrophobic functional materials, prepare heptadecafluorodecyltriethoxysilane, nano Aerogel, organotin catalyst, and isopropyl alcohol are mixed and coated on steel pipes using a rotary cup electrostatic spray gun with a charging voltage of 50 kV, an atomization pressure of 0.2 MPa, a gun speed of 0.8 m / s, and a film thickness of 150 microns. After spraying, heat curing is immediately performed with a 120°C hot air circulation for ten minutes. According to FTIR or swelling method tests, a cross-linking density of ≥1.5×10⁻ is formed. 4 mol / cm³ cross-linked network, based on which the steel pipe coating is completed; After the steel pipe is coated, it is cured, specifically at 30 degrees Celsius and 75% relative humidity for seven days; after curing, the strength development of the steel pipe is monitored: the compressive strength is 50 to 55 MPa on the third day, and 75 to 80 MPa on the seventh day; the thickness is tested using an electromagnetic induction thickness gauge with an accuracy of plus or minus five microns, in accordance with ISO2808; the porosity is tested using a high-voltage electric spark test with a voltage of fifteen kilovolts, and the qualified standard is no breakdown point; hydrophobic performance verification: the contact angle test uses a five-microliter water droplet, and the result is greater than one hundred and fifty degrees; the friction coefficient test result is 0.015, in accordance with ASTMD1894.

[0024] Example 2: A low resistance bonding ceramic tube coating material, the bottom material comprises 38.5% nano Sol, 4.2% silane coupling agent, 26.5% ethanol, 30.8% deionized water; The ceramic hybrid layer material comprises, by mass percentage, 24% of industrial-grade active magnesium oxide, 47% of modified sulphoaluminate cement, 10% of acrylic emulsion, and 19% of deionized water; The hydrophobic functional material includes 90% heptadecafluorodecyltriethoxysilane, 5.5% nano aerogel, 0.5% organotin catalyst, 4% isopropyl alcohol; nanometer The solid content of the sol is 40%, the particle size is 10-20nm, and the pH is 9.0-10.5; the silane coupling agent is KH-560; the industrial grade active magnesium oxide ≥35%, activity ≥60s; solid content of acrylic emulsion is 50%; water-cement ratio of ceramic hybrid layer material is 0.26-0.28, wherein water includes deionized water and acrylic emulsion, and ash includes modified sulphoaluminate cement; fluorine content of heptadecafluorodecyl triethoxysilane is ≥28; nano The particle size of the aerogel is 30-50 nm; the ratio of industrial-grade activated magnesium oxide to modified sulphoaluminate cement is 1:2.5-3.0; The base material accounts for 15%-18% of the total material mass, the ceramic hybrid layer material accounts for 70%-75% of the total material mass, and the hydrophobic functional material accounts for 10%-12% of the total material mass. The base material is used to directly contact the substrate of the steel pipe and to fill the sandblasting pits. The ceramic hybrid layer material serves as the main protective layer of the steel pipe to bear the mechanical load. The hydrophobic functional material serves as the outermost functional layer of the steel pipe to reduce the flow resistance. 35%-40% of the nano- The sol is used to ensure anchoring strength, the water-cement ratio of the ceramic hybrid layer material is used to balance reactivity and strength, and 85%-90% heptadecafluorodecyltriethoxysilane is used to maintain superhydrophobicity; A coating method for a low-resistance bonding ceramic tube coating material comprises the following steps: S1: Sandblasting: Use compressed air to blow the inner and outer surfaces of the steel pipe to remove loose particles. Use a sandblasting machine with brown corundum abrasive to sandblast the steel pipe. The Mohs hardness of brown corundum is not less than 8, and the particle size standard is G16. It is used to remove oxides and dirt on the surface of the steel pipe. The pressure of the sandblasting machine is controlled at 0.65 MPa to ensure that the abrasive impact force is sufficient to remove rust without damaging the substrate. After sandblasting, the surface roughness Ra value of the steel pipe is tested. It is qualified if it is 55 microns. S2: Immerse the sandblasted steel pipe in activation solution at 40°C for 15 minutes. Rinse the steel pipe surface with deionized water to remove residual acid. Finally, dry the steel pipe at 120°C to ensure that it is completely dry. The activation solution is a 10% oxalic acid solution with 3% hexamethylenetetramine added as a corrosion inhibitor. S3: coating of the bottom material, mixed with nanomaterials by mass percentage Sol, silane coupling agent, ethanol, and deionized water are mechanically stirred for 30 minutes at a speed of 600 revolutions per minute. After the stirring is completed, it is allowed to stand for 15 minutes to defoam. The steel pipe is sprayed with the first coat of spraying using an airless sprayer. The thickness of the first coat of spraying wet film is 40 to 50 microns. After the surface is dried for 10 minutes at an ambient temperature of 25°C, the second coat of spraying is carried out. The cumulative thickness of the spraying is 80 to 90 microns. After the second coat of spraying is completed, it is cured for 24 hours at 40°C and a relative humidity of 60%. S4: coating of ceramic hybrid layer material, preparing industrial-grade active magnesium oxide, modified sulfoaluminate cement, acrylic emulsion, and deionized water according to mass percentage, and mixing them to form ceramic hybrid layer material slurry. Using centrifugal coating process, preheat the steel pipe to 60°C, with an initial speed of 100 revolutions per minute, so that the ceramic hybrid layer material slurry is evenly spread on the surface of the steel pipe; then, through compaction speed of 500 revolutions per minute, maintained for 8 minutes, the thickness of the ceramic hybrid layer material slurry is controlled to 900 microns, and then the coating is completed. In the initial setting stage, the steel pipe is cured at 25°C for 12 hours to complete the magnesium oxide ion bonding; in the final setting stage, the steel pipe is cured at 75°C for 6 hours to generate a ceramic phase; S5: coating of hydrophobic functional materials, prepare heptadecafluorodecyltriethoxysilane, nano Aerogel, organotin catalyst, and isopropyl alcohol are mixed and coated on steel pipes using a rotary cup electrostatic spray gun with a charging voltage of 50 kV, an atomization pressure of 0.2 MPa, a gun speed of 0.8 m / s, and a film thickness of 150 microns. After spraying, heat curing is immediately performed with a 120°C hot air circulation for ten minutes. According to FTIR or swelling method tests, a cross-linking density of ≥1.5×10⁻ is formed. 4 mol / cm³ cross-linked network, based on which the steel pipe coating is completed; After the steel pipe is coated, it is cured, specifically at 30 degrees Celsius and 75% relative humidity for seven days; after curing, the strength development of the steel pipe is monitored: the compressive strength is 50 to 55 MPa on the third day, and 75 to 80 MPa on the seventh day; the thickness is tested using an electromagnetic induction thickness gauge with an accuracy of plus or minus five microns, in accordance with ISO2808; the porosity is tested using a high-voltage electric spark test with a voltage of fifteen kilovolts, and the qualified standard is no breakdown point; hydrophobic performance verification: the contact angle test uses a five-microliter water droplet, and the result is greater than one hundred and fifty degrees; the friction coefficient test result is 0.015, in accordance with ASTMD1894.

[0025] Example 3: A low resistance bonding ceramic tube coating material, the bottom material includes 37% nano Sol, 4.8% silane coupling agent, 28% ethanol, 30.2% deionized water; The ceramic hybrid layer material comprises, by mass percentage, 25% of industrial-grade active magnesium oxide, 46% of modified sulphoaluminate cement, 9% of acrylic emulsion, and 20% of deionized water; The hydrophobic functional material includes 88% heptadecafluorodecyltriethoxysilane, 6% nano aerogel, 0.6% organotin catalyst, 5.4% isopropyl alcohol; nanometer The solid content of the sol is 40%, the particle size is 10-20nm, and the pH is 9.0-10.5; the silane coupling agent is KH-560; the industrial grade active magnesium oxide ≥35%, activity ≥60s; solid content of acrylic emulsion is 50%; water-cement ratio of ceramic hybrid layer material is 0.26-0.28, wherein water includes deionized water and acrylic emulsion, and ash includes modified sulphoaluminate cement; fluorine content of heptadecafluorodecyl triethoxysilane is ≥28; nano The particle size of the aerogel is 30-50 nm; the ratio of industrial-grade activated magnesium oxide to modified sulphoaluminate cement is 1:2.5-3.0; The base material accounts for 15%-18% of the total material mass, the ceramic hybrid layer material accounts for 70%-75% of the total material mass, and the hydrophobic functional material accounts for 10%-12% of the total material mass. The base material is used to directly contact the substrate of the steel pipe and to fill the sandblasting pits. The ceramic hybrid layer material serves as the main protective layer of the steel pipe to bear the mechanical load. The hydrophobic functional material serves as the outermost functional layer of the steel pipe to reduce the flow resistance. 35%-40% of the nano- The sol is used to ensure anchoring strength, the water-cement ratio of the ceramic hybrid layer material is used to balance reactivity and strength, and 85%-90% heptadecafluorodecyltriethoxysilane is used to maintain superhydrophobicity; A coating method for a low-resistance bonding ceramic tube coating material comprises the following steps: S1: Sandblasting: Use compressed air to blow the inner and outer surfaces of the steel pipe to remove loose particles. Use a sandblasting machine with brown corundum abrasive to sandblast the steel pipe. The Mohs hardness of brown corundum is not less than 8, and the particle size standard is G16. It is used to remove oxides and dirt on the surface of the steel pipe. The pressure of the sandblasting machine is controlled at 0.65 MPa to ensure that the abrasive impact force is sufficient to remove rust without damaging the substrate. After sandblasting, the surface roughness Ra value of the steel pipe is tested. It is qualified if it is 55 microns. S2: Immerse the sandblasted steel pipe in activation solution at 40°C for 15 minutes. Rinse the steel pipe surface with deionized water to remove residual acid. Finally, dry the steel pipe at 120°C to ensure that it is completely dry. The activation solution is a 10% oxalic acid solution with 3% hexamethylenetetramine added as a corrosion inhibitor. S3: coating of the bottom material, mixed with nanomaterials by mass percentage Sol, silane coupling agent, ethanol, and deionized water are mechanically stirred for 30 minutes at a speed of 600 revolutions per minute. After the stirring is completed, it is allowed to stand for 15 minutes to defoam. The steel pipe is sprayed with the first coat of spraying using an airless sprayer. The thickness of the first coat of spraying wet film is 40 to 50 microns. After the surface is dried for 10 minutes at an ambient temperature of 25°C, the second coat of spraying is carried out. The cumulative thickness of the spraying is 80 to 90 microns. After the second coat of spraying is completed, it is cured for 24 hours at 40°C and a relative humidity of 60%. S4: coating of ceramic hybrid layer material, preparing industrial-grade active magnesium oxide, modified sulfoaluminate cement, acrylic emulsion, and deionized water according to mass percentage, and mixing them to form ceramic hybrid layer material slurry. Using centrifugal coating process, preheat the steel pipe to 60°C, with an initial speed of 100 revolutions per minute, so that the ceramic hybrid layer material slurry is evenly spread on the surface of the steel pipe; then, through compaction speed of 500 revolutions per minute, maintained for 8 minutes, the thickness of the ceramic hybrid layer material slurry is controlled to 900 microns, and then the coating is completed. In the initial setting stage, the steel pipe is cured at 25°C for 12 hours to complete the magnesium oxide ion bonding; in the final setting stage, the steel pipe is cured at 75°C for 6 hours to generate a ceramic phase; S5: coating of hydrophobic functional materials, prepare heptadecafluorodecyltriethoxysilane, nano Aerogel, organotin catalyst, and isopropyl alcohol are mixed and coated on steel pipes using a rotary cup electrostatic spray gun with a charging voltage of 50 kV, an atomization pressure of 0.2 MPa, a gun speed of 0.8 m / s, and a film thickness of 150 microns. After spraying, heat curing is immediately performed with a 120°C hot air circulation for ten minutes. According to FTIR or swelling method tests, a cross-linking density of ≥1.5×10⁻ is formed. 4 mol / cm³ cross-linked network, based on which the steel pipe coating is completed; After the steel pipe is coated, it is cured, specifically at 30 degrees Celsius and 75% relative humidity for seven days; after curing, the strength development of the steel pipe is monitored: the compressive strength is 50 to 55 MPa on the third day, and 75 to 80 MPa on the seventh day; the thickness is tested using an electromagnetic induction thickness gauge with an accuracy of plus or minus five microns, in accordance with ISO2808; the porosity is tested using a high-voltage electric spark test with a voltage of fifteen kilovolts, and the qualified standard is no breakdown point; hydrophobic performance verification: the contact angle test uses a five-microliter water droplet, and the result is greater than one hundred and fifty degrees; the friction coefficient test result is 0.015, in accordance with ASTMD1894.

[0026] Example 4: The performance of the coated steel pipe of the present invention was compared with that of a conventional steel pipe. Here, Example 1 was selected for comparison. The following is a comparison table of inner wall roughness and flow resistance: The following is a comparison table of hydrophobic modification effects: Based on this, it can be seen that the steel pipe coated with the present invention can achieve better energy consumption optimization. After hydrophobic modification, the friction coefficient is reduced to 1 / 5-1 / 8 of that of traditional pipes, and pumping energy consumption is saved by up to 70%. It can be seen from the above table that the present invention is superior to traditional steel pipes in terms of material performance and long-term economy, and is an ideal choice for solving the pain points of high energy consumption and high maintenance in fluid transportation systems.

[0027] Taking oil pipelines as an example, the use of bonded ceramic linings can reduce annual maintenance costs by 30%-50%, with an investment payback period of about 2-3 years, which is very economical.

[0028] Figure 1 It can be seen that the roughness of the steel pipe coated by the present invention only increases to 1 / 20-1 / 40 of that of the traditional steel pipe during its 15-year service life, which can significantly suppress the generation of turbulence.

[0029] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-resistance bonding ceramic tube coating material, comprising a base material, a ceramic hybrid layer material, and a hydrophobic functional material, characterized in that: The bottom layer material comprises 35%-40% nano Sol, 4%-5% silane coupling agent, 25%-30% ethanol, 30%-35% deionized water; The ceramic hybrid layer material comprises, by mass percentage, 20%-25% of industrial-grade active magnesium oxide, 45%-50% of modified sulphoaluminate cement, 8%-10% of acrylic emulsion, and 20%-25% of deionized water; The hydrophobic functional material comprises 85%-90% heptadecafluorodecyltriethoxysilane, 5%-8% nano Aerogel, 0.5%-1% organotin catalyst, 4%-10% isopropyl alcohol.

2. The low-resistance bonding ceramic tube coating material according to claim 1, characterized in that: The nano The solid content of the sol is 40%, the particle size is 10-20nm, and the pH is 9.0-10.5; the silane coupling agent is KH-560; the industrial grade active magnesium oxide ≥35%, activity ≥60s; the solid content of the acrylic emulsion is 50%; the water-cement ratio of the ceramic hybrid layer material is 0.26-0.28, wherein the water includes deionized water and acrylic emulsion, the ash includes modified sulphoaluminate cement, the fluorine content of the heptadecafluorodecyl triethoxysilane is ≥28%; the nano The particle size of the aerogel is 30-50 nm; the ratio of the industrial-grade active magnesium oxide to the modified sulphoaluminate cement is 1:2.5-3.

0.

3. The low-resistance bonding ceramic tube coating material according to claim 1, characterized in that: The base material accounts for 15%-18% of the total material mass, the ceramic hybrid layer material accounts for 70%-75% of the total material mass, and the hydrophobic functional material accounts for 10%-12% of the total material mass. The base material is used to directly contact the substrate of the steel pipe and to fill sandblasting pits. The ceramic hybrid layer material serves as the main protective layer of the steel pipe and is used to bear mechanical loads. The hydrophobic functional material serves as the outermost functional layer of the steel pipe and is used to reduce flow resistance.

4. The low-resistance bonding ceramic tube coating material according to claim 1, characterized in that: The bottom layer material comprises 38.2% of nano Sol, 4.5% silane coupling agent, 27.3% ethanol, 30% deionized water; The ceramic hybrid layer material comprises, by mass percentage, 22.5% of industrial-grade active magnesium oxide, 52.5% of modified sulphoaluminate cement, 8.0% of acrylic emulsion, and 17.0% of deionized water; The hydrophobic functional material includes 85.7% of heptadecafluorodecyltriethoxysilane, 7.1% of nano aerogel, 0.7% organotin catalyst, 6.5% isopropyl alcohol.

5. The low-resistance bonding ceramic tube coating material according to claim 1, characterized in that: The bottom layer material comprises 38.5% of nano Sol, 4.2% silane coupling agent, 26.5% ethanol, 30.8% deionized water; The ceramic hybrid layer material comprises, by mass percentage, 24% industrial-grade active magnesium oxide, 47% modified sulphoaluminate cement, 10% acrylic emulsion, and 19% deionized water; The hydrophobic functional material comprises 90% heptadecafluorodecyltriethoxysilane, 5.5% nano aerogel, 0.5% organotin catalyst, 4% isopropyl alcohol.

6. The low-resistance bonding ceramic tube coating material according to claim 1, characterized in that: The bottom layer material comprises 37% nano Sol, 4.8% silane coupling agent, 28% ethanol, 30.2% deionized water; The ceramic hybrid layer material comprises, by mass percentage, 25% industrial-grade active magnesium oxide, 46% modified sulphoaluminate cement, 9% acrylic emulsion, and 20% deionized water; The hydrophobic functional material includes 88% heptadecafluorodecyltriethoxysilane, 6% nano aerogel, 0.6% organotin catalyst, 5.4% isopropyl alcohol.

7. A method for coating a low-resistance bonding ceramic tube coating material, using the low-resistance bonding ceramic tube coating material according to any one of claims 1 to 6, characterized in that: The following steps are included: S1: Sandblasting: Use compressed air to blow the inner and outer surfaces of the steel pipe to remove loose particles. Use a sandblasting machine with brown corundum abrasive to sandblast the steel pipe to remove oxides and dirt on the surface of the steel pipe. The pressure of the sandblasting machine is controlled at 0.65 MPa. After sandblasting, the surface roughness Ra value of the steel pipe is tested. It is qualified if it is 55 microns. S2: Immerse the sandblasted steel pipe in activation solution at 40°C for 15 minutes. Rinse the steel pipe surface with deionized water to remove residual acid. Finally, dry the steel pipe at 120°C to ensure it is completely dry. S3: coating of the bottom material, mixed with nanomaterials by mass percentage Sol, silane coupling agent, ethanol, and deionized water are mechanically stirred for 30 minutes at a speed of 600 revolutions per minute. After the stirring is completed, it is allowed to stand for 15 minutes to defoam. The steel pipe is sprayed with the first coat of spraying using an airless sprayer. The thickness of the first coat of spraying wet film is 40 to 50 microns. After the surface is dried for 10 minutes at an ambient temperature of 25°C, the second coat of spraying is carried out. The cumulative thickness of the spraying is 80 to 90 microns. After the second coat of spraying is completed, it is cured for 24 hours at 40°C and a relative humidity of 60%. S4: coating of ceramic hybrid layer material, preparing industrial-grade active magnesium oxide, modified sulfoaluminate cement, acrylic emulsion, and deionized water according to mass percentage, and mixing them to form ceramic hybrid layer material slurry. Using centrifugal coating process, preheat the steel pipe to 60°C, with an initial speed of 100 revolutions per minute, so that the ceramic hybrid layer material slurry is evenly spread on the surface of the steel pipe; then, through compaction speed of 500 revolutions per minute, maintained for 8 minutes, the thickness of the ceramic hybrid layer material slurry is controlled to 900 microns, and then the coating is completed. In the initial setting stage, the steel pipe is cured at 25°C for 12 hours to complete the magnesium oxide ion bonding; in the final setting stage, the steel pipe is cured at 75°C for 6 hours to generate a ceramic phase; S5: coating of hydrophobic functional materials, prepare heptadecafluorodecyltriethoxysilane, nano Aerogel, organotin catalyst, and isopropyl alcohol are mixed and coated on steel pipes using a rotary cup electrostatic spray gun with a charging voltage of 50 kV, an atomization pressure of 0.2 MPa, a gun speed of 0.8 m / s, and a film thickness of 150 microns. After spraying, heat curing is immediately performed with a 120°C hot air circulation for ten minutes. According to FTIR or swelling method tests, a cross-linking density of ≥1.5×10⁻ is formed. 4 mol / cm³ cross-linked network, based on which the steel pipe is coated.

8. The coating method of the low-resistance bonding ceramic tube coating material according to claim 7, characterized in that: In the S2, the activation solution is a 10% oxalic acid solution, and 3% hexamethylenetetramine is added as a corrosion inhibitor.

9. The coating method of the low-resistance bonding ceramic tube coating material according to claim 7, characterized in that: In the step S5, after the steel pipe is coated, it is cured, specifically at 30 degrees Celsius and 75% relative humidity for seven days.

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