A ceramic-lined pipe wear-resistant protective agent and a preparation method thereof

Abstract

The application discloses a kind of ceramic lining pipeline wear-resistant protective agent and preparation method thereof, belong to anticorrosive wear-resistant material technical field.The protective agent is made by A component and B component according to weight ratio 100:20-40 is mixed.The application is by optimizing formula composition and preparation process, especially the synergistic effect of modified nanometer titanium dioxide and the adjustment into agent, it is suitable for the wear-resistant anticorrosive protection and repair of various industrial pipelines and equipment, service life is greater than or equal to 15 years, solve the problem that traditional material wear resistance is poor, security risk is big, service life is short, simultaneously by modification treatment and the addition of adjustment into agent, further enhance the comprehensive performance of protective agent, with wide industrialization application prospect.

Description

Technical Field

[0001] This invention relates to the field of protective agents, specifically to a wear-resistant protective agent for ceramic-lined pipes and its preparation method. Background Technology

[0002] In industrial sectors such as thermal power plants, pipelines and related equipment are constantly exposed to the scouring and corrosive environment of media containing solid particles, such as slurry and pulverized coal. Examples include slurry circulation pipelines in desulfurization systems, pulverized coal conveying pipelines in boiler systems, and seawater desalination pipelines in water treatment systems. Their inner walls are prone to severe physical wear and chemical corrosion, leading to thinning, perforation, and leakage of the pipelines. This not only affects the normal operation of the equipment but also requires frequent maintenance and replacement, increasing production costs and safety risks.

[0003] Currently, commonly used pipeline protection materials in the industry mainly include glass flakes, rubber linings, and ordinary wear-resistant coatings. However, these materials have obvious defects: glass flake materials have solvent evaporation and penetration channels, large shrinkage rate, low adhesion (≤10MPa), and a service life of only 5-10 years. They are also flammable and toxic, and solvent evaporation is harmful to human health and the environment. Rubber linings have a large number of joints, are prone to aging and cracking, and also pose flammable and toxic safety hazards, with a limited service life. Ordinary wear-resistant coatings have low hardness, insufficient wear resistance, and poor adhesion. They are prone to falling off under heavy wear conditions and cannot meet the needs of long-term protection.

[0004] Furthermore, while some existing ceramic-based protective materials have improved wear resistance to some extent, they suffer from problems such as unreasonable formulations, complex preparation processes, long curing times, and difficult construction. They also struggle to simultaneously achieve high hardness, high adhesion, and good density, failing to meet the high-efficiency requirements of on-site repairs in thermal power plants. Therefore, developing a ceramic-lined pipe wear-resistant protective agent that is highly wear-resistant, has high adhesion, good density, is safe and environmentally friendly, and is easy to construct, to overcome the technical shortcomings of existing materials, has become an urgent technical problem to be solved in the field of anti-corrosion and wear-resistant materials. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the purpose of this invention is to provide a wear-resistant protective agent for ceramic-lined pipes and its preparation method, so as to solve the problems mentioned in the background art.

[0006] The present invention solves the technical problem by adopting the following technical solution: This invention provides a wear-resistant protective agent for ceramic-lined pipes and its preparation method, which is made by mixing component A and component B in a weight ratio of 100:20-40, wherein component A is a base material and component B is a curing agent; The A component, by weight, comprises: 40-60 parts silicon carbide ceramic particles, 20-30 parts modified resin, 10-15 parts silicon dioxide, 5-10 parts alumina, 3-8 parts nano titanium dioxide, 1-3 parts dispersant, 1-2 parts coupling agent, 2-5 parts flame retardant, and 3-5 parts blending agent. Component B comprises: 10-15 parts of isocyanate curing agent and 5-10 parts of polyamide curing agent.

[0007] Furthermore, the specific details of each component are as follows: (1) Silicon carbide ceramic particles: with a particle size of 5-50μm and a purity of ≥99%, as a wear-resistant main agent, it provides excellent wear resistance. Its high hardness can resist the impact and wear of solid particles. (2) Modified resin: It is epoxy-modified phenolic resin. Through organosilicon modification, it combines the high adhesion of epoxy resin with the high temperature resistance and corrosion resistance of phenolic resin. As a binder, it ensures that the ceramic particles are tightly bonded to the pipe matrix. (3) Silica: Particle size 1-5μm, purity ≥98%, as a filler to improve the density of the protective agent and reduce porosity; (4) Alumina: Particle size is 3-10μm, purity ≥99%, which helps to enhance hardness and wear resistance, and works synergistically with silicon carbide to optimize wear resistance; (5) Nano titanium dioxide: with a particle size of 50-100nm, as a functional additive, to improve the anti-aging performance and density of the protective agent and inhibit the penetration of corrosive media; the nano titanium dioxide is also modified, and the specific modification method is: to impregnate the nano titanium dioxide in an impregnation solution of 4-7 times the total amount of nano titanium dioxide, and to perform ultrasonic impregnation treatment, with an ultrasonic power of 350-400W, for 1 hour. After impregnation, the solution is filtered and dried. The impregnation solution includes the following raw materials by weight: 2-5 parts boron nitride, 3-5 parts mica powder, 2-5 parts nano calcium carbonate, 5-8 parts lanthanum oxide and 8-12 parts sodium dodecylbenzenesulfonate solution with a mass fraction of 5%.

[0008] Additive: 3-5 parts of additive are added to component A. The additive is prepared by mixing 3-5 parts of hydroxyapatite, 2-5 parts of yttrium oxide, 1-2 parts of nanocellulose and 5-8 parts of sodium alginate solution with a mass fraction of 2-5% and ball milling. The ball milling speed is 1000-1500 r / min and the ball milling time is 2 h. After the ball milling is completed, the mixture is filtered and dried to obtain the additive. The additive can further improve the density, wear resistance and bonding force with the matrix of the protective agent, and synergistically optimize the comprehensive performance of the protective agent.

[0009] (6) Dispersant: It is a polycarboxylate dispersant to promote uniform dispersion of each component and avoid particle agglomeration; (7) Coupling agent: KH550 is a silane coupling agent, which enhances the interfacial bonding force between inorganic particles and organic resin and improves the overall mechanical properties of the protective agent. (8) Flame retardant: It is a magnesium hydroxide flame retardant, which is halogen-free and environmentally friendly, and improves the flame retardant performance of the protective agent to avoid fire risk; (9) Isocyanate curing agent and polyamide curing agent: synergistic effect to achieve rapid curing of the protective agent at room temperature and shorten the construction cycle.

[0010] 2. Preferred Scheme of Protective Agent Furthermore, the optimal composition of the wear-resistant protective agent for the ceramic-lined pipe is as follows: Component A, by weight: 50 parts silicon carbide ceramic particles, 25 parts modified resin, 12 parts silicon dioxide, 8 parts alumina, 5 parts nano titanium dioxide, 2 parts dispersant, 1.5 parts coupling agent, 3 parts flame retardant, and 4 parts blending agent. Component B, by weight: 12 parts isocyanate curing agent, 8 parts polyamide curing agent; The mixing weight ratio of component A to component B is 100:30.

[0011] 3. Preparation method of wear-resistant protective agent for ceramic-lined pipes Specifically, the following steps are included: Preparation of S1 and A components: (1) Raw material pretreatment: Place silicon carbide ceramic particles, silicon dioxide and alumina into a vacuum drying oven and dry them at 100-120℃ for 2-3 hours to remove moisture and cool them to room temperature for later use. (2) Mixing and dispersing: Weigh the pretreated silicon carbide ceramic particles, silicon dioxide and alumina according to the weight parts, add dispersant and coupling agent, put them into a high-speed mixer, mix for 30-40 minutes at a speed of 1500-2000 r / min to obtain mixed powder; (3) Resin mixing: Add modified resin, modified nano titanium dioxide, flame retardant and modifier to the mixed powder, adjust the speed of the mixer to 800-1000 r / min, and continue mixing for 60-90 min to ensure that each component is evenly dispersed and obtain viscous component A. Preparation of S2 and B components: Weigh the isocyanate curing agent and polyamide curing agent according to the weight parts, put them into a mixing tank, stir for 20-30 minutes at a speed of 300-500 r / min, and obtain component B after uniform mixing; S3. Preparation of finished product: Add component A and component B into a mixing device at a weight ratio of 100:20-40, and stir for 10-15 minutes at room temperature (25±2℃) and a speed of 500-800 r / min. After mixing evenly, degas under vacuum for 5-10 minutes to remove bubbles and obtain the wear-resistant protective agent for ceramic lining pipes.

[0012] 4. Application method of protective agent (1) Base treatment: Grind, remove rust and oil from the inner wall of the pipe or the surface of the equipment to be repaired to ensure that the surface roughness Ra≥3.2μm and there are no loose impurities and oil stains; (2) Coating construction: Apply the prepared protective agent evenly to the treated base surface by smearing, spraying or scraping. The coating thickness is adjusted to 1-5mm according to the working conditions. It can be applied in multiple times, with an interval of 2-4 hours between each application. (3) Curing and maintenance: Curing at room temperature (25±2℃) for 8-12 hours is sufficient for use; if it is necessary to speed up the curing process, it can be cured at 40-60℃ for 4-6 hours. After curing, there is no shrinkage, forming a seamless ceramic inner lining protective layer.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This invention exhibits superior wear resistance: It uses high-purity silicon carbide ceramic particles as the core wear-resistant component, combined with alumina for synergistic reinforcement. The protective agent has a Rockwell hardness ≥109HR, and the wear rate is ≤0.05g / cm², effectively resisting the impact and wear of media such as slurry and coal dust. Its wear resistance far exceeds that of traditional glass flake and rubber lining materials. Epoxy-modified phenolic resin is used as a binder, combined with a silane coupling agent to enhance interfacial bonding. The adhesion between the protective agent and the steel substrate is ≥30MPa, more than three times that of traditional materials. The entire structure is seamlessly connected, with no solvent evaporation channels and a porosity ≤0.5%, effectively blocking the penetration of corrosive media and preventing detachment and corrosion failure. Under heavy wear conditions, its service life is ≥15 years, far exceeding the 5-10 year service life of traditional materials. It is suitable for desulfurization in thermal power plants. This product is widely used in equipment such as pipelines, pumps, impellers, and absorption towers in sulfur systems, boiler systems, steam turbine systems, and water treatment systems. It can also be widely applied to wear-resistant and corrosion-resistant protection in industries such as petroleum, chemical, and machinery, demonstrating strong versatility. After modification with a specific impregnation solution, nano-titanium dioxide exhibits better dispersibility and compatibility with other components. Combined with the synergistic effect of boron nitride and lanthanum oxide, it can further enhance the anti-aging properties, density, and wear resistance of the protective agent, effectively inhibiting the penetration of corrosive media and extending the service life of the protective agent. The additive, through a reasonable ratio of hydroxyapatite, yttrium oxide, nanocellulose, and sodium alginate, can synergistically enhance the hardness, wear resistance, and adhesion to the pipeline substrate of the protective agent, reducing the risk of protective layer detachment and further optimizing the overall performance of the protective agent to adapt to more stringent wear conditions. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Example 1 A ceramic-lined pipe wear-resistant protective agent is prepared by mixing component A and component B in a weight ratio of 100:30; Component A, by weight: 50 parts silicon carbide ceramic particles, 25 parts epoxy-modified phenolic resin, 12 parts silicon dioxide, 8 parts alumina, 5 parts nano titanium dioxide, 2 parts polycarboxylate dispersant, 1.5 parts silane coupling agent KH550, and 3 parts magnesium hydroxide flame retardant. Component B, by weight: 12 parts isocyanate curing agent and 8 parts polyamide curing agent.

[0016] Its preparation method includes the following steps: Preparation of S1 and A components: (1) Raw material pretreatment: Silicon carbide ceramic particles, silicon dioxide and alumina are placed in a vacuum drying oven and dried at 110℃ for 2.5h, and then cooled to room temperature; (2) Mixing and dispersing: Weigh the pretreated powder raw material, add dispersant and coupling agent, put it into a high-speed mixer, mix at 1800 r / min for 35 min to obtain mixed powder; (3) Resin mixing: Add modified resin, modified nano titanium dioxide, flame retardant and modifier (4 parts) to the mixed powder, stir at 900 r / min for 75 min to obtain component A; Preparation of S2 and B components: Weigh the isocyanate curing agent and polyamide curing agent, put them into a stirring tank, stir at 400 r / min for 25 min to obtain component B; S3. Finished product preparation: Mix component A and component B at a ratio of 100:30, stir at 600 r / min for 12 min, and degas under vacuum for 8 min to obtain the wear-resistant protective agent.

[0017] Construction method: Grind the inner wall of the pipe to Ra=3.2μm, remove rust and oil, apply protective agent with a coating thickness of 3mm, and cure at room temperature for 10h.

[0018] Example 2 A wear-resistant protective agent for ceramic-lined pipes is prepared by mixing component A and component B in a weight ratio of 100:20. Component A, by weight: 40 parts silicon carbide ceramic particles, 20 parts epoxy-modified phenolic resin, 10 parts silicon dioxide, 5 parts alumina, 3 parts nano titanium dioxide, 1 part polycarboxylate dispersant, 1 part silane coupling agent KH550, 2 parts magnesium hydroxide flame retardant, and 3 parts blending agent. Component B, by weight: 10 parts isocyanate curing agent and 5 parts polyamide curing agent.

[0019] The preparation method is the same as in Example 1, except that the mixer speed is adjusted to 1500 r / min (mixing and dispersing step) and 800 r / min (resin mixing step), and the stirring time is adjusted to 30 min and 60 min.

[0020] Application method: Spray application, coating thickness 2mm, cure at room temperature for 12 hours.

[0021] Example 3 A ceramic-lined pipe wear-resistant protective agent is prepared by mixing component A and component B in a weight ratio of 100:40; Component A, by weight: 60 parts silicon carbide ceramic particles, 30 parts epoxy-modified phenolic resin, 15 parts silicon dioxide, 10 parts alumina, 8 parts nano titanium dioxide, 3 parts polycarboxylate dispersant, 2 parts silane coupling agent KH550, 5 parts magnesium hydroxide flame retardant, and 5 parts blending agent. Component B, by weight: 15 parts isocyanate curing agent and 10 parts polyamide curing agent.

[0022] The preparation method is the same as in Example 1, except that the mixer speed is adjusted to 2000 r / min (mixing and dispersing step) and 1000 r / min (resin mixing step), the stirring time is adjusted to 40 min and 90 min, and the vacuum degassing time is 10 min.

[0023] Application method: Apply in two coats, with a total thickness of 5mm, and cure at 40℃ for 6 hours.

[0024] The performance tests of Examples 1-3 and the comparative examples of this invention were all performed in accordance with the following standards to ensure the accuracy, repeatability and comparability of the test data. All tests were conducted in an environment with a room temperature of 25±2℃ and a relative humidity of 50±5%. Three parallel samples were set for each test group, and the average value was taken as the final test result.

[0025] 1. Hardness testing standards The test shall be conducted in accordance with the "Rockwell Hardness Test Method for Plastics" (GB / T33328-2016). A Rockwell hardness tester shall be used, and an HRA scale shall be selected. Five different test points shall be selected on the surface of the sample after the protective agent has been cured. The hardness values ​​shall be measured and recorded, and the average value shall be taken as the final hardness result. The Rockwell hardness shall be ≥109HR.

[0026] 2. Adhesion Detection Standard Refer to "Paints and Varnishes - Pull-off Adhesion Test" (GB / T5210 - 2006). Use a pull-off adhesion tester to bond the sample coated with the protective agent (the substrate is Q235 steel plate) to the fixture, apply a tensile force at a rate of 5 mm / min until the protective layer separates from the substrate, record the maximum tensile force value, calculate the adhesion (MPa), and the adhesion is required to be ≥ 30 MPa.

[0027] 3. Abrasion Resistance Detection Standard Refer to "Paints and Varnishes - Determination of Abrasion Resistance - Rotating Rubber Wheel Method" (GB / T1768 - 2006). Use an abrasion resistance tester, select a CS - 17 grinding wheel, apply a load of 5 N, rotate at a speed of 1000 r / min, weigh the mass difference of the sample before and after testing, calculate the wear amount (g / cm²), and the wear amount is required to be ≤ 0.05 g / cm².

[0028] 4. Density Detection Standard Adopt the metallographic microscope observation method. Make a cross-section slice of the protective agent sample, magnify it 500 times, observe the pore distribution of the cross-section, and calculate the porosity (pore area / total area × 100%); at the same time, adopt the penetrant testing method. Spray the penetrant on the surface of the sample, wipe it clean after standing for 10 min, spray the developer, and observe whether there are any penetration marks. No penetration marks and a porosity ≤ 0.5% are considered qualified.

[0029] 5. Corrosion Resistance Detection Standard Refer to the American standard ASTM D 6137 - 97 (Reapproved 2018). Immerse the protective agent sample in a 20% H2SO4 solution and conduct a room temperature - 177°C cold and hot cycle test (each cycle: room temperature for 2 h → 177°C for 2 h → cool down to room temperature), with a total of 30 cycles. Observe whether there are cracks, blisters, or peeling on the surface of the sample. No obvious abnormalities are considered qualified.

[0030] To clarify the comprehensive performance of the protective agent of this invention, conduct a comprehensive test on the products prepared in Examples 1 - 3. The specific data is shown in the following table:

[0031] To verify the technical advantages of the protective agent of this invention, set up comparative examples and compare them with Example 1. The specific settings are as follows: Comparative Example 1: Commercially available glass flake protective material (traditional material); Comparative Example 2: Commercially available rubber lining material (traditional material); Comparative Example 3: The same formulation as Example 1, but without adding silicon carbide ceramic particles; Comparative Example 4: The formulation is the same as in Example 1, except that ordinary epoxy resin is used instead of the modified resin; Comparative Example 5: The formulation is the same as that of Example 1, except that the nano-titanium dioxide has not been modified and boron nitride and lanthanum oxide have not been added to the impregnation solution (the impregnation solution consists of 3-5 parts mica powder, 2-5 parts nano-calcium carbonate and 8-12 parts sodium dodecylbenzenesulfonate solution with a mass fraction of 5%). Comparative Example 6: The formulation was the same as in Example 1, except that no additive was added; Comparative Example 7: The formulation was the same as in Example 1, except that the nano-titanium dioxide was not modified (boron nitride and lanthanum oxide were not added to the impregnation solution) and no additives were added.

[0032] Performance tests were conducted on the comparative examples and Example 1 above. The test items were the same as those in Examples 1-3. The specific performance data are shown in the table below:

[0033] The hardness and adhesion of Example 1 far exceed those of Comparative Example 1 (glass flakes) and Comparative Example 2 (rubber lining). The wear is only 1 / 8 to 1 / 10 of that of traditional materials, the service life is extended by more than 2 times, and it is safe and environmentally friendly, with no flammable or toxic hazards. It completely solves the core defects of traditional materials and meets the long-term wear-resistant and corrosion-resistant requirements of industrial pipelines. The key role of silicon carbide ceramic particles: In Comparative Example 3, without the addition of silicon carbide ceramic particles, the hardness and wear resistance decreased significantly, the wear amount increased to 0.18 g / cm², and the service life was shortened to 10 years. This indicates that silicon carbide ceramic particles are the core component for improving the wear resistance of the protective agent, and their high hardness can effectively resist the impact and wear of the medium. The important role of modified resin: In Comparative Example 4, ordinary epoxy resin was used to replace the modified resin. The adhesion decreased from 35 MPa to 22 MPa, and the wear resistance and service life also decreased significantly. This shows that epoxy-modified phenolic resin can significantly enhance the bonding force between the protective agent and the matrix, while improving the overall mechanical properties and stability of the protective agent. Synergistic advantages of the technical solution of the present invention: Example 1 achieves comprehensive performance improvement in high hardness, high adhesion, high wear resistance, safety and environmental protection through the synergistic effect of silicon carbide ceramic particles, modified resin, silicon dioxide, alumina and other components. All indicators are better than those of the comparative examples. In particular, the service life can reach 18 years under heavy wear conditions, which is suitable for the stringent use requirements of industrial fields such as thermal power plants. It has significant technical innovation and industrialization value. Compared with Example 1, Comparative Example 5, which was not modified and whose impregnation solution did not contain boron nitride and lanthanum oxide, showed a decrease in Rockwell hardness to 108HR, a decrease in adhesion to 31MPa, an increase in wear rate to 0.06g / cm², and a shortened service life to 15 years. This indicates that the modification treatment of nano-titanium dioxide and the addition of boron nitride and lanthanum oxide to the impregnation solution can significantly improve the hardness, adhesion, and wear resistance of the protective agent and extend its service life. Boron nitride can enhance the dispersibility of nano-titanium dioxide, and lanthanum oxide can improve its anti-aging and corrosion resistance, synergistically optimizing the density of the protective agent and inhibiting the penetration of corrosive media. Compared with Example 1, Comparative Example 6, without the addition of the additive, showed that the Rockwell hardness of the protective agent decreased to 107HR, the adhesion decreased to 30MPa, the wear rate increased to 0.07g / cm², and the service life was shortened to 14 years. This indicates that the additive can effectively improve the comprehensive mechanical properties of the protective agent. The hydroxyapatite and yttrium oxide in the additive can enhance hardness and wear resistance, while nanocellulose and sodium alginate can improve the bonding force between the protective agent and the pipe substrate, reduce the risk of detachment, and synergistically improve the stability of the protective agent in use. Compared with Example 1, Comparative Example 7, which did not modify nano-titanium dioxide and did not add any additives, showed the most significant decrease in various performance indicators. Its Rockwell hardness was only 102HR, adhesion was 27MPa, wear amount was 0.11g / cm², and service life was 12 years, which were far lower than those of Example 1. This indicates that there is a synergistic effect between modified nano-titanium dioxide and additives. The combined effect of the two can further optimize the hardness, adhesion, wear resistance, and service life of the protective agent, achieving a technical effect of 1+1>2, highlighting the innovation and superiority of the technical solution of this invention.

[0034] The invention can be implemented in other specific forms in light of the details of the exemplary embodiments described above, without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A wear-resistant protective agent for ceramic-lined pipes, characterized in that: It is made by mixing component A and component B in a weight ratio of 100:20-40; Component A is the base material, comprising by weight: 40-60 parts silicon carbide ceramic particles, 20-30 parts modified resin, 10-15 parts silica, 5-10 parts alumina, 3-8 parts nano titanium dioxide, 1-3 parts dispersant, 1-2 parts coupling agent, and 2-5 parts flame retardant; Component B is the curing agent, comprising by weight: 10-15 parts isocyanate curing agent and 5-10 parts polyamide curing agent.

2. The wear-resistant protective agent for ceramic-lined pipes according to claim 1, characterized in that: The silicon carbide ceramic particles have a particle size of 5-50 μm and a purity of ≥99%; the modified resin is an epoxy-modified phenolic resin; the coupling agent is a silane coupling agent KH550; the dispersant is a polycarboxylate dispersant; and the flame retardant is a magnesium hydroxide flame retardant.

3. The wear-resistant protective agent for ceramic-lined pipes according to claim 1, characterized in that: The nano-titanium dioxide is further modified. The specific modification method is as follows: the nano-titanium dioxide is immersed in an impregnation solution with a volume of 4-7 times the total amount of nano-titanium dioxide and ultrasonically impregnated for 1 hour with an ultrasonic power of 350-400W. After impregnation, the nano-titanium dioxide is filtered and dried.

4. The wear-resistant protective agent for ceramic-lined pipes according to claim 3, characterized in that: The impregnation solution comprises the following raw materials in parts by weight: 2-5 parts boron nitride, 3-5 parts mica powder, 2-5 parts nano calcium carbonate, 5-8 parts lanthanum oxide, and 8-12 parts sodium dodecylbenzenesulfonate solution with a mass fraction of 5%.

5. The wear-resistant protective agent for ceramic-lined pipes according to claim 3, characterized in that: 3-5 parts of a blending agent are also added to component A; The preparation method of the additive is as follows: 3-5 parts of hydroxyapatite, 2-5 parts of yttrium oxide, 1-2 parts of nanocellulose and 5-8 parts of sodium alginate solution with a mass fraction of 2-5% are mixed and ball-milled. The ball milling speed is 1000-1500 r / min and the ball milling time is 2h. After the ball milling is completed, the mixture is filtered and dried to obtain the additive.

6. The wear-resistant protective agent for ceramic-lined pipes according to claim 5, characterized in that: The sodium alginate solution has a mass fraction of 2-5%.

7. The wear-resistant protective agent for ceramic-lined pipes according to claim 1, characterized in that: The optimal proportions of each component are as follows: Component A by weight: 50 parts silicon carbide ceramic particles, 25 parts epoxy-modified phenolic resin, 12 parts silica, 8 parts alumina, 5 parts nano titanium dioxide, 2 parts polycarboxylate dispersant, 1.5 parts silane coupling agent KH550, and 3 parts magnesium hydroxide flame retardant; Component B by weight: 12 parts isocyanate curing agent and 8 parts polyamide curing agent; The mixing weight ratio of component A to component B is 100:

30.

8. A method for preparing the wear-resistant protective agent for ceramic-lined pipes according to any one of claims 1-7, characterized in that: Includes the following steps: Preparation of S1 and A components: (1) Dry silicon carbide ceramic particles, silicon dioxide and alumina at 100-120℃ for 2-3h and cool to room temperature; (2) Add dispersant and coupling agent and mix at 1500-2000r / min for 30-40min to obtain mixed powder; (3) Add modified resin, nano titanium dioxide and flame retardant, stir at 800-1000 r / min for 60-90 min to obtain component A; Preparation of S2 and B components: Mix isocyanate curing agent and polyamide curing agent in proportion, stir at 300-500 r / min for 20-30 min to obtain component B; S3. Finished product preparation: Mix component A and component B at a weight ratio of 100:20-40, stir at 500-800 r / min for 10-15 min, and degas under vacuum for 5-10 min to obtain a ceramic lining pipe wear-resistant protective agent.

9. The preparation method according to claim 8, characterized in that: The drying temperature described in S1 is 110℃, and the drying time is 2.5h.

10. The preparation method according to claim 8, characterized in that: The mixing and dispersion speed was 1800 r / min, and the mixing time was 35 min; the resin mixing speed was 900 r / min, and the stirring time was 75 min.

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