Preparation method of explosion-proof thickened wear-resistant rubber-plastic pipe
By employing a multi-layered structural design and self-healing coating technology, the wear resistance and safety of rubber and plastic pipes are improved, solving the problems of wear and explosion under complex working conditions, and achieving efficient industrial environment adaptability and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHUJI SHENTONG RUBBER & PLASTIC PIPE CO LTD
- Filing Date
- 2024-12-30
- Publication Date
- 2026-08-04
AI Technical Summary
Existing rubber and plastic pipes are prone to wear and explosion under complex working conditions, and their wear resistance and safety are insufficient, which limits their application range and increases maintenance costs.
It adopts a multi-layer structure design, with an inner layer of ultra-high wear-resistant composite layer, a middle layer of explosion-proof energy absorption layer, and an outer layer of explosion-proof impact barrier layer. Combined with nanomaterials and self-healing coating, the material performance is improved through a multi-head co-extrusion system and ion bombardment technology.
It significantly improves the compressive strength, high temperature resistance, and chemical corrosion resistance of rubber and plastic pipes, extends their service life, reduces maintenance costs, and adapts to the needs of various industrial environments.
Smart Images
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Abstract
Description
Technical Field
[0001] This invention relates to the field of rubber and plastic pipes, and more specifically, to a method for preparing an explosion-proof, thickened, wear-resistant rubber and plastic pipe. Background Technology
[0002] In the field of rubber and plastic pipe manufacturing, the wear resistance and safety of traditional products still need to be improved, especially in complex working conditions where wear and explosion accidents are prone to occur. Rubber and plastic pipes face different challenges in different industrial environments. Ordinary rubber and plastic pipes not only limit the scope of use but also increase maintenance costs.
[0003] Patent CN217597982U discloses a flame-retardant, multi-layered, thickened, explosion-proof rubber-plastic pipe, comprising a pipe body, a flame-retardant layer on the outer side of the pipe body, a rubber-plastic layer on the inner side of the flame-retardant layer, a reinforcing ring within the rubber-plastic layer, a polyester braided layer on the inner wall of the rubber-plastic layer, a modified PVC layer on the inner wall of the polyester braided layer, reinforcing ribs on the inner wall of the modified PVC layer, and an aluminum foil sheath on the outer wall of the reinforcing ring. This invention improves the flame-retardant effect of the rubber-plastic pipe through the flame-retardant layer, enabling the pipe to resist fire damage. Although this design incorporates a multi-layered structure, increasing thickness and explosion-proof capability, and provides flame retardancy, its wear resistance and corrosion resistance are not strong, and it still cannot cope with various complex industrial environments. Summary of the Invention
[0004] To address this issue, this solution proposes a method for preparing explosion-proof, thickened, wear-resistant rubber and plastic pipes.
[0005] An explosion-proof, thickened, wear-resistant rubber-plastic pipe includes an inner layer, a middle layer, and an outer layer. The inner layer is an ultra-high wear-resistant composite layer composed of polytetrafluoroethylene and polyimide, which has extremely high wear resistance and thermal stability. Furthermore, it is reinforced with nano-sized silicon carbide particles and graphene to further improve wear resistance and high-temperature resistance.
[0006] The intermediate layer is an explosion-proof energy absorption layer, which uses shape memory polymer combined with cross-linked polyethylene to form a smart material that can respond to pressure changes. It also incorporates high-strength aramid fiber and carbon fiber composite material to further enhance tensile strength and explosion resistance.
[0007] The outer layer is an explosion-proof impact barrier layer, made of nano-ceramic reinforced silicone rubber to improve the material's impact resistance and high-pressure resistance. Furthermore, ultra-high molecular weight polyethylene is combined with ceramic particles to enhance high-pressure resistance and explosion resistance, while ensuring the outer layer possesses a certain degree of flexibility.
[0008] The method for preparing an explosion-proof, thickened, wear-resistant rubber-plastic pipe includes the following steps:
[0009] S1. The raw materials are thoroughly dried before feeding. Specifically, the drying temperature for polytetrafluoroethylene is 120℃ and the drying time is 6 hours; the drying temperature for polyimide is 160℃ and the drying time is 4 hours; and the drying temperature for ultra-high molecular weight polyethylene is 70℃ and the drying time is 3 hours.
[0010] S2. Each layer of material undergoes segmented preheating before entering the extruder head: the first stage preheating temperature is 50–100℃ to improve the initial flexibility of the substrate; the second stage preheating temperature is 100–150℃ to soften the polymer material; and the third stage preheating temperature is the material melting temperature +10–20℃ to ensure optimal fluidity. The holding time for each heating zone is 1–3 minutes.
[0011] S3. A multi-head co-extrusion system is adopted, with each head controlling one layer of material. The barrel temperature is set as follows: inner layer 250–320℃, middle layer 220–270℃, outer layer 180–230℃. The screw speed is maintained at 60–90 rpm to ensure uniform melting of the material.
[0012] S4. The molten multi-layer material is gradually compounded through a multi-head co-extrusion die. The flow channel design in the die is used to achieve uniform superposition of multiple layers. The die pressure is controlled at 10–20 MPa to prevent the formation of air bubbles. Then, the material is gradually cooled through a water cooling system at a cooling rate of 1–3℃ / second to ensure the stability of the pipe dimensions.
[0013] Preferably, polyurethane is also introduced into the inner layer as a flexible and self-lubricating layer to reduce the coefficient of friction and improve the smoothness of fluid transport in the pipe. Ultra-high wear-resistant composite material (PTFE+PI+SiC+graphene) is used to give the inner surface of the pipe excellent wear resistance and corrosion resistance.
[0014] Preferably, the middle layer also incorporates a pressure-sensitive phase change material, which can absorb energy and diffuse pressure under the action of an explosive shock wave, preventing the pipe from rupturing. The shape memory polymer (SMP) and aramid carbon fiber network enhance the pipe's explosion resistance, and the interlayer automatically absorbs the shock wave energy when impacted, reducing the peak pressure of the explosive shock wave.
[0015] Preferably, the outer layer is coated with a flame-retardant coating containing fluoride to effectively resist high temperature and flame propagation. It adopts a composite structure of ceramic-reinforced silicone rubber and ultra-high molecular weight polyethylene (UHMWPE) to ensure that the pipe has excellent impact resistance and pressure resistance, and the exterior can effectively resist the transmission of explosions or shock waves.
[0016] Preferably, the explosion-proof, thickened, wear-resistant rubber and plastic pipe interface adopts a double sealing structure to ensure the sealing of gas and liquid and prevent leakage of high-pressure media.
[0017] The explosion-proof, thickened, wear-resistant rubber-plastic pipe joint adopts a metal + rubber composite design to enhance pressure resistance and prevent the joint from rupturing due to excessive pressure.
[0018] Preferably, after step S4, the following steps are further performed:
[0019] S5. A self-healing coating is applied to the outer layer of the pipe by spraying. The self-healing resin encapsulated in microcapsules forms a thin film with self-healing capabilities on the surface of the pipe.
[0020] Preferably, the microcapsule shell material is polyurethane, and the core is epoxy resin; the liquid epoxy resin is dispersed in an aqueous phase by interfacial polymerization, and the capsule shell is formed by cross-linking reaction, wherein the dispersion temperature is 30-50℃, the dispersion time is 2-4 hours, the stirring speed is 2000-3000 rpm, and the capsule size is controlled in the range of 10-100 μm.
[0021] Subsequently, 40–60 wt% polyurethane resin was selected as the base material, and 20–30 wt% microcapsule content was added to the solvent dimethylformamide to adjust the coating viscosity to 500–800 cps. The coating was then applied to the outer layer of the pipe using a spraying method, with a coating thickness of 50–200 μm, at a temperature of 100–120℃ for 30–60 minutes. After curing, the coating forms a dense, self-healing film. When microcracks appear, the microcapsules rupture, releasing the repair fluid to quickly seal the cracks.
[0022] Preferably, after step S5, there is an additional step: S6, introducing functional ions, high-energy nitrogen ions and ammonium chloride ions, into the deep layer of the pipe through ion bombardment to enhance its antioxidant properties, chemical corrosion resistance and adhesion strength.
[0023] Preferably, step S6 includes the following steps:
[0024] S6.1. Use high-energy ion implantation equipment, equipped with both nitrogen ion and ammonium chloride ion sources, ensuring ion source purity ≥99.99%, and maintaining the pressure inside the chamber at 10. -4 -10 -6 Pa, to avoid oxygen or moisture interfering with the ion implantation effect.
[0025] S6.2 Use ethanol to perform ultrasonic cleaning on the pipes to remove surface oil, dust and other contaminants. The cleaning time is 10-15 minutes.
[0026] S6.3. Argon gas is used to clean the surface, activate the molecules on the pipe surface, and improve the ion adhesion effect. The argon gas flow rate is 20–50 standard cubic centimeters / minute, the time is 5–10 minutes, and the power is 100–200W.
[0027] S6.4. Fix the tube on the rotating sample stage to ensure the ion beam bombards every part of the tube evenly. The sample stage rotation speed is 10–30 rpm to ensure uniform ion coverage. The injection angle is 45°–90° to improve ion penetration depth and uniformity. Bombardment time per unit area: 10–30 seconds. Penetration depth: Control the ion penetration depth to 1–5 μm. S6.5. After implantation, anneal the tube in a nitrogen atmosphere to release the thermal stress generated during ion implantation.
[0028] Compared with the prior art, the advantages of this invention are:
[0029] (1) This invention significantly improves the compressive strength, high temperature resistance and chemical corrosion resistance of rubber and plastic pipes through deep injection of functional ions and material structure design, and significantly reduces the risk of explosion and corrosion under complex working conditions.
[0030] (2) The inner layer of this invention uses high-performance materials and nano-reinforced fillers to significantly improve wear resistance; the outer layer introduces self-healing coating technology, which realizes automatic healing of local damage through microcapsule structure, extending product service life and reducing maintenance costs.
[0031] (3) The innovative preparation process of this invention ensures the stability of production efficiency and product quality, while adapting to the needs of various industrial environments, reducing the frequency of equipment maintenance and subsequent maintenance costs for enterprise customers, and enhancing market competitiveness. Detailed Implementation
[0032] The present application will be further described in detail below with reference to embodiments, comparative examples and performance test results. These embodiments should not be construed as limiting the scope of protection claimed in this application.
[0033] Examples 1-7
[0034] Example 1:
[0035] An explosion-proof, thickened, wear-resistant rubber-plastic pipe includes an inner layer, a middle layer, and an outer layer. The inner layer is an ultra-high wear-resistant composite layer, which is composed of polytetrafluoroethylene and polyimide, and is reinforced with nano-sized silicon carbide particles and graphene.
[0036] The middle layer is an explosion-proof energy absorption layer, which uses shape memory polymer combined with cross-linked polyethylene to form a smart material that can respond to pressure changes, and is embedded with high-strength aramid fiber and carbon fiber composite material.
[0037] The outer layer is an explosion-proof impact barrier layer, which uses nano-ceramic reinforced silicone rubber and combines ultra-high molecular weight polyethylene with ceramic particles to improve high pressure resistance and explosion resistance.
[0038] A method for preparing an explosion-proof, thickened, wear-resistant rubber-plastic pipe includes the following steps:
[0039] S1. The raw materials are thoroughly dried before feeding. Specifically, the drying temperature for polytetrafluoroethylene is 120℃ and the drying time is 6 hours; the drying temperature for polyimide is 160℃ and the drying time is 4 hours; and the drying temperature for ultra-high molecular weight polyethylene is 70℃ and the drying time is 3 hours.
[0040] S2. Each layer of material undergoes segmented preheating before entering the extruder head. The first segment preheating temperature is 50–100℃ to improve the initial flexibility of the substrate. The second segment preheating temperature is 100–150℃ to soften the polymer material. The third segment preheating temperature is the material melting temperature +10–20℃. The holding time for each heating zone is 1–3 minutes.
[0041] S3. A multi-head co-extrusion system is adopted, with each head controlling one layer of material. The barrel temperature is set as follows: inner layer 250–320℃, middle layer 220–270℃, outer layer 180–230℃, and the screw speed is maintained at 60–90 rpm.
[0042] S4. The molten multi-layer material is gradually compounded through a multi-head co-extrusion die. The flow channel design in the die is used to achieve uniform superposition of multiple layers. The die pressure is controlled at 10–20 MPa to prevent the formation of bubbles. Then, the material is gradually cooled through a water cooling system at a cooling rate of 1–3 °C / second.
[0043] S5. A self-healing coating is applied to the outer layer of the pipe by spraying. The self-healing resin encapsulated in microcapsules forms a thin film with self-healing capabilities on the surface of the pipe.
[0044] The microcapsule shell material is polyurethane, and the core is epoxy resin. The liquid epoxy resin is dispersed in the aqueous phase by interfacial polymerization and the capsule shell is formed by cross-linking reaction. The dispersion temperature is 30–50℃, the dispersion time is 2–4 hours, the stirring speed is 2000–3000 rpm, and the capsule size is controlled in the range of 10–100 μm.
[0045] Then, 40–60 wt% polyurethane resin was selected as the base material, and 20–30 wt% microcapsule content was added to the solvent dimethylformamide. The coating viscosity was adjusted to 500–800 cps, and the coating was applied to the outer layer of the pipe by spraying. The coating thickness was 50–200 μm, the temperature was 100–120℃, and the heating time was 30–60 minutes.
[0046] S6. Functional ions, such as high-energy nitrogen ions and ammonium chloride ions, are introduced into the deep layers of the pipe through ion bombardment, enhancing its antioxidant properties, chemical corrosion resistance, and adhesion strength.
[0047] S6.1. Use high-energy ion implantation equipment, equipped with both nitrogen ion and ammonium chloride ion sources, ensuring ion source purity ≥99.99%, and maintaining the pressure inside the chamber at 10. -4 -10 -6 Pa;
[0048] S6.2 Use ethanol to perform ultrasonic cleaning on the pipes to remove surface oil, dust and other contaminants. The cleaning time is 10-15 minutes.
[0049] S6.3. Argon gas is used to clean the surface, activate the molecules on the pipe surface, and improve the ion adhesion effect. The argon gas flow rate is 20–50 standard cubic centimeters / minute, the time is 5–10 minutes, and the power is 100–200W.
[0050] S6.4 Fix the tube on the rotating sample stage to ensure that the ion beam bombards every part of the tube evenly. The sample stage rotation speed is 10–30 rpm, the injection angle is 45°–90°, the bombardment time per unit area is 10–30 seconds, and the ion penetration depth is controlled at 1–5 μm.
[0051] S6.5 After the injection is completed, the pipe is annealed in a nitrogen environment to release the thermal stress generated during the ion implantation process.
[0052] Example 2: The difference from Example 1 is that the inner layer material is polytetrafluoroethylene;
[0053] Example 3: The difference from Example 1 is that the inner layer material is polyimide;
[0054] Example 4: The difference from Example 1 is that the inner layer does not use nanoscale silicon carbide particles and graphene reinforcement;
[0055] Example 5: The difference from Example 1 is that the intermediate layer does not embed high-strength aramid fiber and carbon fiber composite material;
[0056] Example 6: The difference from Example 1 is that the outer layer material is nano-ceramic reinforced silicone rubber;
[0057] Example 7: The difference from Example 1 is that the outer layer material is ultra-high molecular weight polyethylene;
[0058] Comparative tests were conducted on Examples 1-7 to test the explosion-proof and wear-resistant capabilities of different rubber and plastic pipes. The test method is as follows: Five rubber and plastic pipes (a total of 35 pipes) were made for each example, each pipe being 1 meter in length.
[0059] 1. Explosion-proof capability test
[0060] Step 1: Ensure both ends of each rubber / plastic tube are sealed, inject dry air, and set the initial pressure to 0.5 MPa;
[0061] Step 2: Fix the pipe in the high-pressure chamber, record its pressure bearing data with the sensor, gradually increase the pressure to 10MPa at a rate of 0.5MPa / min, and maintain it for 10 minutes. Check for leaks, cracks or failures.
[0062] Step 3: Apply ultimate pressure and continue to increase the pressure until the pipe ruptures. Record the rupture pressure and deformation data.
[0063] Step 4: Explosion-proof energy absorption performance assessment, and calculation of energy absorption efficiency η.
[0064] Energy calculation formula:
[0065]
[0066] Where P max V is the rupture pressure, and V is the volume change.
[0067] Step 5: Record the rupture pressure, deformation, and post-rupture morphology (microscopic analysis) of each pipe.
[0068] 2. Abrasion resistance test
[0069] Step 1: Cut each tube to obtain a 10cm sample, and polish the surface with sandpaper to ensure initial surface consistency; Step 2: Measure and record the initial mass of the sample, accurate to 0.001g;
[0070] Step 3: Conduct the test on a DIN abrasion tester under the following conditions: pulley speed 200 rpm; load force 10 N; test time 60 minutes.
[0071] Step 3: Record the friction surface temperature and thickness loss of the sample during the test;
[0072] Step 4: After the test, measure the remaining mass of the sample and calculate the wear rate.
[0073]
[0074] Step 5: Use SEM or AFM to observe the worn area and record the depth, width, and material peeling characteristics of the surface damage.
[0075] The test results are shown in Table 1.
[0076]
[0077] Table 1
[0078] Test results show that Example 1 performs best in terms of burst pressure and energy absorption efficiency, and can be regarded as the optimal choice for explosion-proof performance.
[0079] Comparative Examples 1-5
[0080] Comparative Example 1: The difference from Example 1 is that the outer shell material of the self-healing functional coating is polyurea, and the core material is epoxy resin; Comparative Example 2: The difference from Example 1 is that the outer shell material of the self-healing functional coating is silicon dioxide, and the core material is graphite suspension.
[0081] Comparative Example 3: The difference from Example 1 is that step S5 is omitted;
[0082] Comparative Example 4: The difference from Example 1 is that the functional ions also include silicon ions;
[0083] Comparative Example 5: The difference from Example 1 is that step S6 is omitted;
[0084] Example 1 was compared with Comparative Examples 1-3 to test the repair speed at different temperatures. The test method is as follows:
[0085] The standard for successful repair is defined as a degree of closure of the damaged area ≥95%, observed under a microscope (magnification ≥100x). The repair time is counted from the start of the self-healing process after the injury until the repair standard is met.
[0086] Step 1: Prepare test samples according to the coating schemes of Example 1 and Comparative Examples 1-3, ensuring that the surface is uniform and meets the thickness standard (50–200 μm), and clean all samples thoroughly, wipe with ethanol to remove surface stains, and place them in an environment with a temperature of 25°C and a humidity of 50% RH.
[0087] Step 2: Use a scratch tester to generate standardized cracks on the coating surface of each sample. The crack depth is 50 μm, the width is 20 μm, and the crack length is 10 mm. Stop the instrument immediately after the cracks are generated and mark the start time.
[0088] Step 3: Place the sample under a microscope to observe the crack repair process, record the time when the crack is ≥95% closed, take a micrograph every 1 minute, perform image analysis on the degree of crack closure, record the repair time after the test is completed, and save the micrograph for subsequent analysis.
[0089] Step 4: Place the samples in test chambers simulating high temperature (50°C) and high humidity (90% RH) respectively, and repeat steps 2 and 3.
[0090] The test results are shown in Table 2.
[0091]
[0092] Table 2
[0093] Example 1 and Comparative Examples 4 and 5 were compared to test the corrosion resistance of the rubber-plastic pipes under different environments. The test methods are as follows:
[0094] Step 1: Prepare samples of Example 1, Comparative Example 4 (containing silicon ions) and Comparative Example 5 (without ion implantation treatment), ensuring that the size is consistent, clean the sample surface, rinse with deionized water and dry;
[0095] Step 2: Immerse the sample in 3.5% NaCl, 10% H2SO4 and 10% NaOH solutions respectively, keeping them completely submerged. Take out the sample every 24 hours, rinse with deionized water and dry, weigh and record the mass loss. Continue immersion for 72 hours and record the total mass loss.
[0096] Step 3: In the salt spray test chamber, spray 5% NaCl solution at a spray rate of 1–2 mL / h for 72 hours. Take samples every 24 hours, observe and record the surface changes.
[0097] Step 4: After the corrosion test is completed, perform a tensile strength test on the sample, compare the change in tensile strength before and after corrosion, and record the tensile strength retention rate using a tensile testing machine in accordance with ASTM D638 standard.
[0098] Tensile strength retention rate = (Tensile strength after corrosion ÷ Initial tensile strength) × 100%.
[0099] The test results are shown in Table 3.
[0100]
[0101] Table 3
[0102] The high-energy ion treatment in Example 1 significantly improved the corrosion resistance of the material, especially in strong acid and alkaline environments.
[0103] The introduction of silicon ions in Comparative Example 4 further enhanced its resistance to chemical corrosion, especially in acidic environments where it outperformed Example 1.
[0104] The non-ion-treated material in Comparative Example 5 exhibited significant corrosion weaknesses, especially in strong acid and salt spray environments where the mass loss rate was high and the mechanical properties decreased significantly.
[0105] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications can be made to the present invention without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their effects.
Claims
1. A method for preparing an explosion-proof thickened wear-resistant rubber-plastic pipe, characterized in that, The explosion-proof, thickened, wear-resistant rubber and plastic pipe includes an inner layer, a middle layer, and an outer layer. The inner layer is an ultra-high wear-resistant composite layer, which is composed of polytetrafluoroethylene and polyimide, and is reinforced with nano-sized silicon carbide particles and graphene. The intermediate layer is an explosion-proof energy absorption layer, which uses shape memory polymer, combined with cross-linked polyethylene and pressure-sensitive phase change material to form a smart material that can respond to pressure changes, and embeds high-strength aramid fiber and carbon fiber composite material. The outer layer is an explosion-proof impact barrier layer, which uses nano-ceramic reinforced silicone rubber and combines ultra-high molecular weight polyethylene with ceramic particles to improve high pressure resistance and explosion resistance. The method for preparing an explosion-proof, thickened, wear-resistant rubber-plastic pipe includes the following steps: S1. The raw materials are thoroughly dried before feeding. Specifically, the drying temperature for polytetrafluoroethylene is 120℃ and the drying time is 6 hours; the drying temperature for polyimide is 160℃ and the drying time is 4 hours; and the drying temperature for ultra-high molecular weight polyethylene is 70℃ and the drying time is 3 hours. S2. Each layer of material undergoes segmented preheating before entering the extruder head. The first segment preheating temperature is 50–100℃ to improve the initial flexibility of the substrate. The second segment preheating temperature is 100–150℃ to soften the polymer material. The third segment preheating temperature is the material melting temperature +10–20℃. The holding time for each heating zone is 1–3 minutes. S3. A multi-head co-extrusion system is adopted, with each head controlling one layer of material. The barrel temperature is set as follows: inner layer 250–320℃, middle layer 220–270℃, outer layer 180–230℃, and the screw speed is maintained at 60–90 rpm. S4. The molten multi-layer material is gradually compounded through a multi-head co-extrusion die. The flow channel design in the die is used to achieve uniform superposition of multiple layers. The die pressure is controlled at 10–20 MPa to prevent the formation of bubbles. Then, the material is gradually cooled through a water cooling system at a cooling rate of 1–3 °C / second.
2. The method for preparing an explosion-proof, thickened, wear-resistant rubber-plastic pipe according to claim 1, characterized in that, The inner layer also incorporates polyurethane as a flexible, self-lubricating layer.
3. The method for preparing an explosion-proof, thickened, wear-resistant rubber-plastic pipe according to claim 1, characterized in that, The outer layer is coated with a flame-retardant coating containing fluoride.
4. The method for preparing an explosion-proof, thickened, wear-resistant rubber-plastic pipe according to claim 1, characterized in that, The explosion-proof, thickened, wear-resistant rubber and plastic pipe has a double sealing structure at the interface, and the joint part of the explosion-proof, thickened, wear-resistant rubber and plastic pipe adopts a metal + rubber composite design.
5. The method for preparing an explosion-proof, thickened, wear-resistant rubber-plastic pipe according to claim 1, characterized in that, Following S4, there is a further step: S5, applying a self-healing coating to the outer layer of the pipe by spraying, and using microcapsule-encapsulated self-healing resin to form a thin film with self-healing capabilities on the surface of the pipe.
6. The method for preparing an explosion-proof, thickened, wear-resistant rubber-plastic pipe according to claim 5, characterized in that, The microcapsule shell material is polyurethane, and the core is epoxy resin. The liquid epoxy resin is dispersed in the aqueous phase by interfacial polymerization and the capsule shell is formed by cross-linking reaction. The dispersion temperature is 30–50℃, the dispersion time is 2–4 hours, the stirring speed is 2000–3000 rpm, and the capsule size is controlled in the range of 10–100 μm. Then, 40–60 wt% polyurethane resin was selected as the base material, and 20–30 wt% microcapsules were added to the solvent dimethylformamide. The coating viscosity was adjusted to 500–800 cps, and the coating was applied to the outer layer of the pipe by spraying. The coating thickness was 50–200 μm, the temperature was 100–120℃, and the heating time was 30–60 minutes.