Anti-aging packaging control pipeline and preparation method thereof

Abstract

The invention discloses an anti-aging packaging control pipeline and a preparation method thereof, and belongs to the technical field of cured resin, the anti-aging packaging control pipeline comprises an inner stainless steel seamless pipe and an outer barrier layer; the outer barrier layer is prepared from the following components in parts by weight: 70 to 90 parts of matrix resin, 10 to 30 parts of composite filler, 0.3 to 0.8 part of stabilizer, 0.1 to 0.3 part of antioxidant and 1 to 2.2 parts of pigment. The montmorillonite and carbon black composite filler is treated by the silane coupling agent, so that the dispersity and compatibility of the filler in matrix resin are improved, the high-temperature aging resistance of the pipeline is further improved, and the performance degradation in a high-temperature environment is reduced; material aging caused by ultraviolet irradiation is effectively delayed by virtue of CSB-coated Fe3O4 NPs, and the ultraviolet resistance of the pipeline is improved; meanwhile, montmorillonite and carbon black treated by a silane coupling agent have a synergistic effect with CSB-coated Fe3O4 NPs, so that the salt mist erosion resistance of the material is improved from different dimensions, the corrosion damage of a salt mist environment to the pipeline is reduced, and the service life of the pipeline in a complex environment is further prolonged.

Description

Technical Field

[0001] This invention relates to the field of cured resins, and more particularly to an anti-aging encapsulation control pipeline and its preparation method. Background Technology

[0002] Encapsulation control lines are key components used in precision manufacturing processes to transport, distribute, or seal various fluids (such as gases, liquids, colloids, slurries, high-purity media, or corrosive chemicals). Their core functions are to achieve high-precision media transmission, stable pressure control, effective environmental isolation, and long-term operational reliability.

[0003] In many industrial sectors, such as chemical processes, marine engineering, high-end medical equipment, and food and beverage, packaging control pipelines not only need to withstand harsh conditions such as high pressure and high temperature, but are also exposed to complex external environmental factors (such as strong ultraviolet radiation and salt spray) for a long time.

[0004] Commonly used encapsulated control pipelines in existing technologies are prone to deformation and creep under high pressure and high temperature, and lack mechanical strength and rigidity. Furthermore, they are susceptible to material aging when exposed to external environments such as ultraviolet radiation for extended periods, leading to increased risks of seal failure, media leakage, or contamination, and thus limiting their service life.

[0005] Therefore, those skilled in the art are dedicated to developing an anti-aging packaged control pipeline and its fabrication method to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the encapsulated control pipeline is prone to deformation and creep under high pressure and high temperature, has insufficient mechanical strength and rigidity, and is prone to material aging when exposed to external environments such as ultraviolet rays for a long time, which leads to sealing failure, increased risk of media leakage or contamination, and limited service life.

[0007] To achieve the above objectives, the present invention provides an anti-aging encapsulated control pipeline, comprising an inner seamless stainless steel tube and an outer barrier layer; The outer barrier layer comprises, by weight, the following components: 70-90 parts of matrix resin, 10-30 parts of composite filler, 0.3-0.8 parts of stabilizer, 0.1-0.3 parts of antioxidant, and 1-2.2 parts of colorant; The matrix resin is composed of polypropylene resin and polyamide resin in a mass ratio of 3-5:4-8; The composite filler is obtained by treating montmorillonite and carbon black in a mass ratio of 1:1.8-2.4 with a silane coupling agent. The mass ratio of CSB@Fe3O4NPs, polyethylene wax, calcium stearate, zinc stearate, epoxidized soybean oil, and pentaerythritol in the stabilizer is 2-5:1-3:5-10:3-6:4-8:2-5.

[0008] A method for fabricating the anti-aging encapsulated control pipeline includes the following steps: S1. Preparation of composite fillers; Take montmorillonite and carbon black and mix them evenly. Weigh out the silane coupling agent and dissolve it in anhydrous ethanol to prepare a treatment solution. Add the treatment solution dropwise to the montmorillonite / carbon black mixture at a dropping rate of 10-20 mL / min. At the same time, raise the temperature of the mixer to 80-100℃ and stir. After the treatment is completed, centrifuge to remove the supernatant. Vacuum dry the precipitate to obtain the composite filler. S2. Preparation of stabilizers; Weigh out calcium stearate, zinc stearate, epoxidized soybean oil, and pentaerythritol in proportion and mix them to obtain a calcium-zinc premix. Add CSB@Fe3O4NPs to the calcium-zinc premix, heat and stir for 1-2 hours. After the reaction is complete, add polyethylene wax and continue stirring. Send the mixture to a twin-screw extruder, extrude and granulate, and cool to obtain the stabilizer. S3. Preparation of anti-aging masterbatch; The matrix resin is fed into the main feed port of a twin-screw extruder. The temperatures of each section of the extruder are set as follows: feeding section 160-180℃, melting section 180-200℃, homogenization section 200-220℃, and screw speed 300-400 rpm. After 8-12 minutes, the premix of composite filler and main antioxidant is added. After 2-3 minutes, the auxiliary antioxidant and stabilizer are added. After melt blending and shear dispersion, the mixture is extruded into strips through the die, cooled and shaped, and then cut into granules by a pelletizer to obtain anti-aging masterbatch. S4. Pretreatment of stainless steel seamless pipe; Take a stainless steel seamless tube, soak it in alcohol to remove surface oil; use sandblasting to roughen the surface of the steel tube and enhance the mechanical interlocking force with the outer layer; immerse the steel tube in an epoxy silane treatment solution at room temperature, take it out and dry it to obtain a pretreated stainless steel seamless tube. S5. Co-extrusion composite molding; The pretreated stainless steel seamless pipe is fed into the preheated composite extrusion die by the traction machine. The anti-aging masterbatch is put into the barrel of the composite extruder. After being melted and plasticized, it is extruded through the annular gap of the die and evenly coated on the outer surface of the stainless steel pipe. S6. Curing; The composite pipeline is placed in a constant temperature curing chamber and kept at 60-80℃ for 2-4 hours. After curing, it is naturally cooled to room temperature to obtain an anti-aging encapsulated control pipeline.

[0009] In a preferred embodiment of the present invention, S1 specifically involves: taking 300-400 mesh montmorillonite and 200-300 nm carbon black at a mass ratio of 1:1.8-2.4 and adding them to a high-speed mixer; stirring at 800-1200 rpm to initially mix them evenly; weighing 0.1-2% of the total mass of the montmorillonite / carbon black mixture using silane coupling agent KH-550 or KH-560; dissolving it in anhydrous ethanol to prepare a 5-10% concentration treatment solution; stirring at 300-500 rpm for 10-15 minutes; and then dropping the treatment solution into a container. Add the montmorillonite / carbon black mixture at a dropping rate of 10-20 mL / min, while simultaneously raising the mixer temperature to 80-100℃ and stirring at 1000-1500 rpm for 20-40 min. After processing, transfer the mixture to a centrifuge and centrifuge at 3000-5000 rpm for 10-15 min to remove the supernatant. Place the precipitate in a vacuum drying oven and dry it at 60-80℃ and a vacuum of -0.08 to -0.1 MPa for 12-24 h to remove residual solvent, thus obtaining the composite filler.

[0010] In another preferred embodiment of the present invention, S2 specifically involves: weighing 5-10 parts of calcium stearate, 3-6 parts of zinc stearate, 4-8 parts of epoxidized soybean oil, and 2-5 parts of pentaerythritol in proportion, adding them to a high-speed mixer, and mixing for 10-20 minutes at a temperature of 40-60°C and a stirring speed of 500-800 r / min to obtain a calcium-zinc premix. Add 2-5 parts of CSB@Fe3O4NPs to the above calcium-zinc premix, raise the temperature of the high-speed mixer to 70-90℃, adjust the stirring speed to 600-1000r / min, and react for 1-2 hours. After the reaction is complete, add 1-3 parts of polyethylene wax and continue stirring for 5-10 minutes. Feed the mixture into a twin-screw extruder and granulate it under the conditions of screw speed of 100-150r / min and temperature of 100-130℃. After cooling, the stabilizer is obtained.

[0011] In another preferred embodiment of the present invention, S3 specifically involves: weighing the following raw materials: 70-90 parts of matrix resin, 10-30 parts of composite filler, 0.3-0.8 parts of stabilizer, 0.1-0.3 parts of antioxidant, and 1-2.2 parts of colorant; The antioxidant is composed of the primary antioxidant, hindered amine light stabilizer Tinuvin 152, and the secondary antioxidant, hindered amine light stabilizer UV3853, in a mass ratio of 2:1. First, the matrix resin and colorant are fed into the main feed port of the twin-screw extruder. The temperatures of each section of the extruder are set as follows: feeding section 160-180℃, melting section 180-200℃, homogenization section 200-220℃, and screw speed 300-400 rpm. After 8-12 minutes, the premix of composite filler and main antioxidant is added through the side feed port. After 2-3 minutes, the auxiliary antioxidant is added through the side feed port. The material stays in the extruder for 2-5 minutes. After melt blending and shear dispersion, it is extruded into strips with a diameter of 3-5 mm through the die head. It is immediately sent to the water cooling tank for cooling and shaping. It is then cut into 2-3 mm long granules by a pelletizer to obtain anti-aging masterbatch.

[0012] In another preferred embodiment of the present invention, S4 specifically involves: taking a stainless steel seamless tube, soaking it in 95% alcohol for 10-15 minutes to remove surface oil stains; using sandblasting to roughen the surface of the steel tube and enhance the mechanical interlocking force with the outer layer; immersing the steel tube in an epoxy silane treatment solution with a concentration of 1-3% for 5-10 minutes at room temperature, and then drying it at 80-100°C for 10-15 minutes to obtain a pretreated stainless steel seamless tube.

[0013] In another preferred embodiment of the present invention, during sandblasting, the abrasive particle size is 80-120 mesh, the pressure is 0.3-0.5 MPa, and the spray angle is 45°-60°.

[0014] In another preferred embodiment of the present invention, S5 specifically involves: feeding the pretreated stainless steel seamless tube into the center of a composite extrusion die preheated to 180-220°C by a traction machine; feeding the anti-aging masterbatch into the barrel of the composite extruder; after melting and plasticizing, extruding it through the annular gap of the die; uniformly coating the outer surface of the stainless steel tube; during the coating process, adjusting the pressure inside the die to 0.5-1.5 MPa to ensure that the molten plastic adheres tightly to the surface of the stainless steel tube; simultaneously opening the cooling jacket outside the die to allow the outer plastic layer to cool and solidify rapidly; and controlling the traction speed at 0.5-2 m / min to ensure that the outer plastic layer and the inner steel tube move synchronously.

[0015] The present invention has the following technical effects: 1. This invention introduces CSB@Fe3O4NPs during the stabilizer preparation process, allowing it to fully react with calcium-zinc premix and combine with polyethylene wax to form a stable system. This not only effectively improves the overall hardness of the pipeline and enhances the material's resistance to deformation, but also strengthens the interfacial bonding performance between the inner and outer layers of the pipeline, reducing the risk of interlayer separation.

[0016] 2. This invention improves the dispersibility and compatibility of montmorillonite and carbon black composite fillers in the matrix resin by treating them with silane coupling agents, thereby enhancing the high-temperature aging resistance of pipelines and reducing performance degradation under high-temperature environments. Furthermore, CSB@Fe3O4NPs effectively delays material aging caused by ultraviolet radiation, improving the pipeline's UV resistance. Simultaneously, the silane coupling agent-treated montmorillonite and carbon black synergistically enhance the material's resistance to salt spray corrosion from different dimensions, reducing the corrosive damage to pipelines caused by salt spray environments and further extending the pipeline's service life in complex environments.

[0017] 3. The pretreatment process designed for stainless steel seamless pipes in this invention first removes surface oil stains with alcohol to ensure cleanliness, then uses sandblasting to create a rough surface to improve mechanical interlocking force, and finally uses epoxy silane treatment liquid to impregnate and form an interface bonding layer. Under the multiple effects, the pipeline sealing performance is significantly optimized, the risk of media leakage is reduced, and the bonding strength between the metal substrate and the outer layer material is further enhanced, thereby improving the overall structural integrity.

[0018] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0019] Figure 1 This is a physical image of an anti-aging packaged control pipeline; Figure 2 This is a sample diagram of an anti-aging packaged control pipeline; Figure 3 This is a picture of the actual product with the inner layer of seamless stainless steel tubing; Figure 4 The infrared spectra of the montmorillonite / carbon black mixture before and after modification in Example 1 are shown. Figure 5 The infrared spectra of CSB@Fe3O4NPs, calcium-zinc premix, and stabilizer in Example 1 are shown. Detailed Implementation

[0020] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0021] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0022] Some exemplary embodiments of the invention have been described for illustrative purposes. It should be understood that the invention may be implemented in other ways not specifically shown in the accompanying drawings.

[0023] Example 1: This example provides an anti-aging packaging control pipeline, including the following steps: S1. Preparation of composite fillers; Montmorillonite (400 mesh) and carbon black (300 nm particle size) were added to a high-speed mixer at a mass ratio of 1:2.4. The mixer was started and stirred (1200 rpm) to make the two initially uniform. Silane coupling agent (KH-560) was weighed at 2% of the total mass of the montmorillonite / carbon black mixture and dissolved in anhydrous ethanol to prepare a 10% concentration treatment solution. The solution was stirred at 500 rpm for 15 min. This treatment solution was then added dropwise to the montmorillonite / carbon black mixture at a rate of 20 mL / min. At the same time, the mixer temperature was raised to 100℃ and stirred at 1500 rpm for 40 min. After treatment, the mixture was transferred to a centrifuge and centrifuged at 5000 rpm for 15 min to remove the supernatant (unreacted coupling agent and ethanol). The precipitate was then placed in a vacuum drying oven and dried at 80℃ and -0.1 MPa vacuum for 24 h to remove residual solvent, yielding the composite filler. S2. Preparation of stabilizers; Weigh out 10 parts calcium stearate, 6 parts zinc stearate, 8 parts epoxidized soybean oil, and 5 parts pentaerythritol according to the proportions, add them to a high-speed mixer, and mix for 20 minutes at a temperature of 60℃ and a stirring speed of 800r / min to obtain a calcium-zinc premix. Add 5 parts of CSB@Fe3O4NPs to the above calcium-zinc premix, raise the temperature of the high-speed mixer to 90℃, adjust the stirring speed to 1000r / min, and react for 2h. After the reaction is completed, add 3 parts of polyethylene wax, continue stirring for 10min, and then feed the mixture into a twin-screw extruder. Extrude and granulate at a screw speed of 150r / min and a temperature of 130℃. After cooling, the stabilizer is obtained. It should be noted that the preparation method of CSB@Fe3O4NPs described in S2 is taken from Liu Qilin, Jiang Liting, Liu Meijia, et al. Study on the adsorption effect of modified chitosan magnetic composite material on multiple heavy metal elements in industrial wastewater [J / OL]. Physical and Chemical Testing - Chemical Section, 1-9 [2025-09-10]. https: / / gfgfy047f83d4b4544a20sb9cqfvoq69pw6p9vficg.res.gxlib.org.cn / urlid / 31.1337.TB.20250708.1807.002. The specific preparation method of CSB@Fe3O4NPs is as follows: Accurately weigh 11.0 g of FeCl3·6H2O and place it in a flask. Measure 90 mL of ethylene glycol and stir while pouring until the FeCl3·6H2O solid in the flask is completely dissolved. Then add 6.6 g of anhydrous sodium acetate and continue stirring until the solution is clear and transparent. Transfer the above solution to a 100 mL hydrothermal reactor, seal it, and place it in a vacuum drying oven at 200 °C for 8 h. Cool to room temperature, separate the product with a magnet, and wash it successively with 100 mL of ethanol and 100 mL of water. Dry it under vacuum at 80 °C for 8 h to obtain Fe3O4NPs. Accurately weigh 1 g of chitosan and add it to 50 mL of 5% (volume fraction) acetic acid solution. Stir magnetically at 25 °C until completely dissolved. Then add 1 mL of 2-thiophene-formaldehyde and stir vigorously at 60 °C for 7 h. Cool to room temperature, add 1 g of Fe3O4NPs while stirring, and react for 60 min. After the reaction is complete, use 100 mL of 0.1 mol·L⁻¹ water. -1 The nanocomposite material CSB@Fe3O4NPs was obtained by washing the product with sodium hydroxide solution and 100 mL of water several times, followed by vacuum drying at 80 °C for 8 h.

[0024] S3. Preparation of anti-aging masterbatch; Weigh the raw materials: 90 parts of matrix resin (composed of polypropylene resin and polyamide resin in a mass ratio of 5:8, wherein the polypropylene resin is purchased from Shanghai Qiaowei Chemical Technology Co., Ltd., grade K8025; and the polyamide resin is purchased from Ningbo Rongsu New Material Co., Ltd., grade TA124), 30 parts of composite filler, 0.8 parts of stabilizer, 0.3 parts of antioxidant (composed of hindered amine light stabilizer Tinuvin 152 as the main antioxidant and hindered amine light stabilizer UV3853 as the auxiliary antioxidant in a mass ratio of 2:1), and 2.2 parts of colorant; The matrix resin and colorant are first fed into the main feed port of the twin-screw extruder. The temperatures of each section of the extruder are set as follows: feed section 180℃, melting section 200℃, homogenization section 220℃, and screw speed 400 rpm. After 12 minutes, the premix of composite filler and main antioxidant (pre-stirred at 200 rpm for 10 minutes) is added through the side feed port. After 3 minutes, the auxiliary antioxidant and stabilizer are added through the side feed port. The material stays in the extruder for 5 minutes. After melt blending and shear dispersion, it is extruded into strips with a diameter of 5 mm through the die head. It is immediately put into a water cooling tank (water temperature 30℃) for cooling and shaping. It is then cut into 3 mm long granules by a pelletizer to obtain anti-aging masterbatch. S4. Pretreatment of stainless steel seamless pipe; Take a stainless steel seamless tube (material 304L, wall thickness 3mm), soak it in 95% alcohol for 15 minutes to remove surface oil stains; use sandblasting treatment (sand particle size 120 mesh, pressure 0.5MPa, spray angle 60°) to make the surface of the steel tube rough and enhance the mechanical interlocking force with the outer layer; immerse the steel tube in a 3% epoxy silane treatment solution (KH-561) at room temperature for 10 minutes, take it out and dry it at 100℃ for 15 minutes to obtain a pretreated stainless steel seamless tube; S5. Co-extrusion composite molding; The pretreated stainless steel seamless tube is fed into the center of the composite extrusion die preheated to 220℃ by the traction machine. The anti-aging masterbatch is put into the barrel of the composite extruder. After being melted and plasticized, it is extruded through the annular gap of the die and evenly coated on the outer surface of the stainless steel tube (outer layer thickness 5mm). During the coating process, the pressure inside the die is adjusted to 1.5MPa to make the molten plastic adhere tightly to the surface of the stainless steel tube. At the same time, the cooling jacket outside the die (water temperature 25℃) is opened to make the outer plastic cool and solidify quickly. The traction speed is controlled at 2m / min to ensure that the outer plastic and the inner steel tube move synchronously and avoid wrinkles or gaps. S6. Curing; The composite pipeline is placed in a constant temperature curing chamber and kept at 80℃ for 4 hours. After curing, it is naturally cooled to room temperature, resulting in an anti-aging encapsulated control pipeline with an inner seamless stainless steel tube and an outer anti-aging barrier layer.

[0025] Example 2: This example provides an anti-aging packaging control pipeline, including the following steps: S1. Preparation of composite fillers; Montmorillonite (300 mesh) and carbon black (200 nm particle size) were added to a high-speed mixer at a mass ratio of 1:1.8. The mixer was started and stirred (800 rpm) to make the two initially uniform. Silane coupling agent (KH-550) was weighed at 0.1% of the total mass of the montmorillonite / carbon black mixture and dissolved in anhydrous ethanol to prepare a 5-10% treatment solution. The solution was stirred at 300 rpm for 10 min. This treatment solution was then added dropwise to the montmorillonite / carbon black mixture at a rate of 10 mL / min. At the same time, the mixer temperature was raised to 80℃ and stirred at 1000 rpm for 20 min. After treatment, the mixture was transferred to a centrifuge and centrifuged at 3000 rpm for 10 min to remove the supernatant (unreacted coupling agent and ethanol). The precipitate was then placed in a vacuum drying oven and dried at 60℃ and -0.08 MPa vacuum for 12 h to remove residual solvent, yielding the composite filler. S2. Preparation of stabilizers; Weigh out 5 parts calcium stearate, 3 parts zinc stearate, 4 parts epoxidized soybean oil, and 2 parts pentaerythritol according to the proportions, add them to a high-speed mixer, and mix for 10 minutes at a temperature of 40℃ and a stirring speed of 500r / min to obtain a calcium-zinc premix. Add 2 parts of CSB@Fe3O4NPs to the above calcium-zinc premix, raise the temperature of the high-speed mixer to 70°C, adjust the stirring speed to 600 r / min, react for 1 h, after the reaction is completed, add 1 part of polyethylene wax, continue stirring for 5 min, and then send the mixture into a twin-screw extruder, extrude and granulate under the conditions of screw speed 100 r / min and temperature 100°C, and obtain the stabilizer after cooling; S3. Preparation of anti-aging masterbatch; Weigh the raw materials: 70 parts of matrix resin (composed of polypropylene resin and polyamide resin in a mass ratio of 3:4), 10 parts of composite filler, 0.3 parts of stabilizer, 0.3 parts of antioxidant (composed of hindered amine light stabilizer Tinuvin 152 as the main antioxidant and hindered amine light stabilizer UV3853 as the auxiliary antioxidant in a mass ratio of 2:1), and 1 part of colorant; The matrix resin and colorant are first fed into the main feed port of the twin-screw extruder. The temperatures of each section of the extruder are set as follows: feeding section 160℃, melting section 180℃, homogenization section 200℃, and screw speed 300 rpm. After 8 minutes, the premix of composite filler and main antioxidant (pre-stirred at 100 rpm for 5 minutes) is added through the side feed port. After 2 minutes, the auxiliary antioxidant and stabilizer are added through the side feed port. The material stays in the extruder for 2 minutes. After melt blending and shear dispersion, it is extruded into strips with a diameter of 3 mm through the die head. It is immediately put into a water cooling tank (water temperature 20℃) for cooling and shaping. It is then cut into 2 mm long granules by a pelletizer to obtain anti-aging masterbatch. S4. Pretreatment of stainless steel seamless pipe; Take a stainless steel seamless tube (material 316L, wall thickness 1mm), soak it in 95% alcohol for 10 minutes to remove surface oil stains; use sandblasting treatment (abrasive particle size 80 mesh, pressure 0.3MPa, spray angle 45°) to make the surface of the steel tube rough and enhance the mechanical interlocking force with the outer layer; immerse the steel tube in a 1% epoxy silane treatment solution (KH-560) at room temperature for 5 minutes, take it out and dry it at 80℃ for 10 minutes to obtain a pretreated stainless steel seamless tube; S5. Co-extrusion composite molding; The pretreated stainless steel seamless tube is fed into the center of the composite extrusion die preheated to 180℃ by the traction machine. The anti-aging masterbatch is put into the barrel of the composite extruder. After being melted and plasticized, it is extruded through the annular gap of the die and evenly coated on the outer surface of the stainless steel tube (outer layer thickness 2mm). During the coating process, the pressure inside the die is adjusted to 0.5MPa to make the molten plastic adhere tightly to the surface of the stainless steel tube. At the same time, the cooling jacket outside the die (water temperature 20℃) is opened to make the outer plastic cool and solidify quickly. The traction speed is controlled at 0.5m / min to ensure that the outer plastic and the inner steel tube move synchronously and avoid wrinkles or gaps. S6. Curing; The composite pipeline is placed in a constant temperature curing chamber and kept at 60°C for 2 hours. After curing, it is naturally cooled to room temperature, resulting in an anti-aging encapsulated control pipeline with an inner layer of seamless stainless steel tube and an outer layer of anti-aging barrier layer.

[0026] Example 3: This example provides an anti-aging packaging control pipeline, including the following steps: S1. Preparation of composite fillers; Montmorillonite (320 mesh) and carbon black (200 nm particle size) were added to a high-speed mixer at a mass ratio of 1:1.9. The mixer was started and stirred at 900 rpm to ensure initial uniformity. Silane coupling agent (KH-560) was weighed at 0.8% of the total mass of the montmorillonite / carbon black mixture and dissolved in anhydrous ethanol to prepare a 7% concentration treatment solution. The solution was stirred at 420 rpm for 12 min. This treatment solution was then added dropwise to the montmorillonite / carbon black mixture at a rate of 16 mL / min. Simultaneously, the mixer temperature was raised to 92℃, and the mixture was stirred at 1200 rpm for 28 min. After treatment, the mixture was transferred to a centrifuge and centrifuged at 4100 rpm for 12 min to remove the supernatant (unreacted coupling agent and ethanol). The precipitate was then placed in a vacuum drying oven and dried at 72℃ and -0.08 MPa vacuum for 20 h to remove residual solvent, yielding the composite filler. S2. Preparation of stabilizers; Weigh out 8 parts calcium stearate, 5 parts zinc stearate, 7 parts epoxidized soybean oil, and 3 parts pentaerythritol according to the proportions, add them to a high-speed mixer, and mix for 11 minutes at a temperature of 55℃ and a stirring speed of 600r / min to obtain a calcium-zinc premix. Add 4 parts of CSB@Fe3O4NPs to the above calcium-zinc premix, raise the temperature of the high-speed mixer to 79°C, adjust the stirring speed to 700 r / min, and react for 2 hours. After the reaction is completed, add 1.8 parts of polyethylene wax, continue stirring for 8 minutes, and then feed the mixture into a twin-screw extruder. Extrude and granulate the mixture at a screw speed of 120 r / min and a temperature of 110°C. After cooling, the stabilizer is obtained. S3. Preparation of anti-aging masterbatch; Weigh the raw materials: 82 parts of matrix resin (composed of polypropylene resin and polyamide resin in a mass ratio of 4:7), 15 parts of composite filler, 0.5 parts of stabilizer, 0.17 parts of antioxidant (composed of hindered amine light stabilizer Tinuvin 152 as the main antioxidant and hindered amine light stabilizer UV3853 as the co-antioxidant in a mass ratio of 2:1), and 1.2 parts of colorant; The matrix resin and colorant are first fed into the main feed port of the twin-screw extruder. The temperatures of each section of the extruder are set as follows: feeding section 165℃, melting section 192℃, homogenization section 203℃, and screw speed 320 rpm. After 9 minutes, the premix of composite filler and main antioxidant (pre-stirred at 140 rpm for 6 minutes) is added through the side feed port. After 2 minutes, the auxiliary antioxidant and stabilizer are added through the side feed port. The material stays in the extruder for 4 minutes. After melt blending and shear dispersion, it is extruded into strips with a diameter of 4 mm through the die head. It is immediately put into a water cooling tank (water temperature 26℃) for cooling and shaping. It is then cut into 3 mm long granules by a pelletizer to obtain anti-aging masterbatch. S4. Pretreatment of stainless steel seamless pipe; Take a stainless steel seamless tube (material 316L, wall thickness 1.6mm), soak it in 95% alcohol for 12 minutes to remove surface oil stains; use sandblasting treatment (abrasive particle size 120 mesh, pressure 0.3MPa, spray angle 45°) to make the surface of the steel tube rough and enhance the mechanical interlocking force with the outer layer; immerse the steel tube in a 1.5% epoxy silane treatment solution (KH-560) at room temperature for 6 minutes, take it out and dry it at 92℃ for 12 minutes to obtain a pretreated stainless steel seamless tube; S5. Co-extrusion composite molding; The pretreated stainless steel seamless tube is fed into the center of the composite extrusion die preheated to 210℃ by the traction machine. The anti-aging masterbatch is put into the barrel of the composite extruder. After being melted and plasticized, it is extruded through the annular gap of the die and evenly coated on the outer surface of the stainless steel tube (outer layer thickness 4mm). During the coating process, the pressure inside the die is adjusted to 1.2MPa to make the molten plastic adhere tightly to the surface of the stainless steel tube. At the same time, the cooling jacket outside the die (water temperature 22℃) is opened to make the outer plastic cool and solidify quickly. The traction speed is controlled at 0.8m / min to ensure that the outer plastic and the inner steel tube move synchronously and avoid wrinkles or gaps. S6. Curing; The composite pipeline is placed in a constant temperature curing chamber and kept at 72℃ for 4 hours. After curing, it is naturally cooled to room temperature, resulting in an anti-aging encapsulated control pipeline with an inner layer of seamless stainless steel tube and an outer layer of anti-aging barrier layer.

[0027] Example 4: This example provides an anti-aging packaging control pipeline, including the following steps: S1. Preparation of composite fillers; Montmorillonite (300 mesh) and carbon black (200 nm particle size) were added to a high-speed mixer at a mass ratio of 1:2.2. The mixer was started and stirred (1100 rpm) to make the two initially uniform. Silane coupling agent (KH-560) was weighed at 1.3% of the total mass of the montmorillonite / carbon black mixture and dissolved in anhydrous ethanol to prepare a 6% concentration treatment solution. The solution was stirred at 380 rpm for 14 min. This treatment solution was then added dropwise to the montmorillonite / carbon black mixture at a rate of 16 mL / min. At the same time, the mixer temperature was raised to 95℃ and stirred at 1100 rpm for 34 min. After treatment, the mixture was transferred to a centrifuge and centrifuged at 4000 rpm for 12 min to remove the supernatant (unreacted coupling agent and ethanol). The precipitate was then placed in a vacuum drying oven and dried at 72℃ and -0.1 MPa vacuum for 18 h to remove residual solvent, yielding the composite filler. S2. Preparation of stabilizers; Weigh out 6 parts calcium stearate, 5 parts zinc stearate, 7 parts epoxidized soybean oil, and 4 parts pentaerythritol according to the proportions, add them to a high-speed mixer, and mix for 14 minutes at a temperature of 45℃ and a stirring speed of 650r / min to obtain a calcium-zinc premix. Add 4 parts of CSB@Fe3O4NPs to the above calcium-zinc premix, raise the temperature of the high-speed mixer to 88℃, adjust the stirring speed to 700r / min, and react for 2h. After the reaction is completed, add 1.7 parts of polyethylene wax, continue stirring for 6min, and then feed the mixture into a twin-screw extruder. Extrude and granulate at a screw speed of 120r / min and a temperature of 122℃. After cooling, the stabilizer is obtained. S3. Preparation of anti-aging masterbatch; Weigh the raw materials: 78 parts of matrix resin (composed of polypropylene resin and polyamide resin in a mass ratio of 4:5), 18 parts of composite filler, 0.4 parts of stabilizer, 0.21 parts of antioxidant (composed of hindered amine light stabilizer Tinuvin 152 as the main antioxidant and hindered amine light stabilizer UV3853 as the auxiliary antioxidant in a mass ratio of 2:1), and 1.6 parts of colorant; The matrix resin and colorant are first fed into the main feed port of the twin-screw extruder. The temperatures of each section of the extruder are set as follows: feeding section 171℃, melting section 189℃, homogenization section 207℃, and screw speed 370 rpm. After 9 minutes, the premix of composite filler and main antioxidant (pre-stirred at 140 rpm for 6 minutes) is added through the side feed port. After 2.4 minutes, the auxiliary antioxidant and stabilizer are added through the side feed port. The material stays in the extruder for 4 minutes. After melt blending and shear dispersion, it is extruded into strips with a diameter of 4 mm through the die head. It is immediately put into a water cooling tank (water temperature 27℃) for cooling and shaping. It is then cut into 2.5 mm long granules by a pelletizer to obtain anti-aging masterbatch. S4. Pretreatment of stainless steel seamless pipe; Take a stainless steel seamless tube (material 316L, wall thickness 2.5mm), soak it in 95% alcohol for 14 minutes to remove surface oil stains; use sandblasting treatment (100 mesh, pressure 0.5MPa, spray angle 60°) to make the surface of the steel tube rough and enhance the mechanical interlocking force with the outer layer; immerse the steel tube in a 2.4% epoxy silane treatment solution (KH-561) at room temperature for 6 minutes, take it out and dry it at 88℃ for 12 minutes to obtain a pretreated stainless steel seamless tube; S5. Co-extrusion composite molding; The pretreated stainless steel seamless tube is fed into the center of the composite extrusion die preheated to 188℃ by the traction machine. The anti-aging masterbatch is put into the barrel of the composite extruder. After being melted and plasticized, it is extruded through the annular gap of the die and evenly coated on the outer surface of the stainless steel tube (outer layer thickness 4mm). During the coating process, the pressure inside the die is adjusted to 0.9MPa to make the molten plastic adhere tightly to the surface of the stainless steel tube. At the same time, the cooling jacket outside the die (water temperature 24℃) is opened to make the outer plastic cool and solidify quickly. The traction speed is controlled at 1.8m / min to ensure that the outer plastic and the inner steel tube move synchronously and avoid wrinkles or gaps. S6. Curing; The composite pipeline is placed in a constant temperature curing chamber and kept at 77°C for 4 hours. After curing, it is naturally cooled to room temperature, resulting in an anti-aging encapsulated control pipeline with an inner layer of seamless stainless steel tubing and an outer layer of anti-aging barrier layer.

[0028] Comparative Example 1: This comparative example differs from Example 4 in that the stabilizer lacks the component: CSB@Fe3O4NPs.

[0029] Comparative Example 2: The difference between this comparative example and Example 4 is that the stainless steel seamless tube was not pretreated.

[0030] Comparative Example 3: The difference between this comparative example and Example 4 is that the composite filler is directly selected from montmorillonite and carbon black with a mass ratio of 1:2.2, without silane coupling agent treatment.

[0031] Comparative Example 4: The difference between this comparative example and Example 4 is that the composite filler was not treated with silane coupling agent; and CSB@Fe3O4NPs were not added to the stabilizer.

[0032] Experimental Example: 1. Infrared spectroscopy was performed on the montmorillonite / carbon black mixture before and after modification in Example 1 (e.g., Figure 4 As shown in the figure (the red peak line represents the modified montmorillonite / carbon black mixture), the intensity of the interlayer hydroxyl stretching peak at 3620-3600 cm⁻¹ is significantly reduced. A distinct epoxy stretching vibration peak (sharp peak, a hallmark functional group of KH-560) appears in the 910-890 cm⁻¹ range. A stronger and wider Si-O-Si stretching vibration peak appears in the 1030-1000 cm⁻¹ range; Around 2920 cm⁻¹: Asymmetric stretching vibration peak of -CH₂-; Around 2850 cm⁻¹: Symmetric stretching vibration peak of -CH2-.

[0033] These two sets of peaks are characteristic signals of the "-CH2-CH2-CH2-" carbon chain in the KH-560 molecule (the unmodified raw material does not have this structure), further confirming that KH-560 has been grafted onto the filler surface; The intensities of the two sets of peaks, 3400-3200 cm⁻¹ (OH stretching of adsorbed water) and 1630-1600 cm⁻¹ (HOH bending), decreased significantly. After grafting with KH-560, the surface of the filler changed from hydrophilic (exposed hydroxyl groups) to hydrophobic (covered by carbon chains and siloxane bonds), and the water adsorption capacity decreased. This indirectly proves that the modification changed the surface properties of the filler, which is consistent with the modification effect of silane coupling agents.

[0034] The stabilizer prepared in Example 1 was subjected to infrared spectroscopy detection (e.g. Figure 5As shown in the figure, the stabilizer was obtained by adding CSB@Fe3O4NPs to the calcium-zinc premix. In its infrared spectrum, the 550-650 cm⁻¹ region showed Fe-O characteristic peaks corresponding to CSB@Fe3O4NPs, while retaining the characteristic peaks of the calcium-zinc premix, indicating that the structure of the calcium-zinc premix was not destroyed and it successfully combined with CSB@Fe3O4NPs. 2. Data on the encapsulated control pipeline before and after aging were detected according to the methods in Table 1; the detection results are shown in Table 2. Wherein, retention rate = data after aging / initial data; growth rate = (data after aging - initial data) / initial data.

[0035] Table 1 Table 2 As shown in the table above, the addition of CSB@Fe3O4NPs improved the hardness and the bonding strength between the inner and outer layers. Pretreatment of stainless steel seamless tubes significantly improves sealing performance (reduced leakage rate) and the bonding strength between inner and outer layers; The high-temperature aging resistance of montmorillonite and carbon black was improved by treating them with silane coupling agents. The addition of CSB@Fe3O4NPs improved the resistance to UV aging. The salt spray aging resistance was improved by treating montmorillonite with carbon black silane coupling agent and by the synergistic effect of CSB@Fe3O4NPs.

[0036] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An anti-aging packaged control pipeline, characterized in that, It includes an inner seamless stainless steel tube and an outer barrier layer; The outer barrier layer comprises, by weight, the following components: 70-90 parts of matrix resin, 10-30 parts of composite filler, 0.3-0.8 parts of stabilizer, 0.1-0.3 parts of antioxidant, and 1-2.2 parts of colorant; The matrix resin is composed of polypropylene resin and polyamide resin in a mass ratio of 3-5:4-8; The composite filler is obtained by treating montmorillonite and carbon black in a mass ratio of 1:1.8-2.4 with a silane coupling agent. The mass ratio of CSB@Fe3O4 NPs, polyethylene wax, calcium stearate, zinc stearate, epoxidized soybean oil, and pentaerythritol in the stabilizer is 2-5:1-3:5-10:3-6:4-8:2-5.

2. A method for preparing an anti-aging encapsulated control pipeline as described in claim 1, characterized in that, Includes the following steps: S1. Preparation of composite fillers; Take montmorillonite and carbon black and mix them evenly. Weigh out the silane coupling agent and dissolve it in anhydrous ethanol to prepare a treatment solution. Add the treatment solution dropwise to the montmorillonite / carbon black mixture at a dropping rate of 10-20 mL / min. At the same time, raise the temperature of the mixer to 80-100℃ and stir. After the treatment is completed, centrifuge to remove the supernatant. Vacuum dry the precipitate to obtain the composite filler. S2. Preparation of stabilizers; Weigh out calcium stearate, zinc stearate, epoxidized soybean oil, and pentaerythritol in proportion and mix them to obtain a calcium-zinc premix. Add CSB@Fe3O4 NPs to the calcium-zinc premix, heat and stir for 1-2 hours. After the reaction is complete, add polyethylene wax and continue stirring. Send the mixture to a twin-screw extruder, extrude and granulate, and cool to obtain the stabilizer. S3. Preparation of anti-aging masterbatch; The matrix resin and colorant are fed into the main feed port of a twin-screw extruder. The temperatures of each section of the extruder are set as follows: feeding section 160-180℃, melting section 180-200℃, homogenization section 200-220℃, and screw speed 300-400 rpm. After 8-12 minutes, the premix of composite filler and main antioxidant is added. After 2-3 minutes, the auxiliary antioxidant and stabilizer are added. After melt blending and shear dispersion, the mixture is extruded into strips through the die, cooled and shaped, and then cut into granules by a pelletizer to obtain anti-aging masterbatch. S4. Pretreatment of stainless steel seamless pipe; Take a stainless steel seamless tube, soak it in alcohol to remove surface oil; use sandblasting to roughen the surface of the steel tube and enhance the mechanical interlocking force with the outer layer; immerse the steel tube in an epoxy silane treatment solution at room temperature, take it out and dry it to obtain a pretreated stainless steel seamless tube. S5. Co-extrusion composite molding; The pretreated stainless steel seamless pipe is fed into the preheated composite extrusion die by the traction machine. The anti-aging masterbatch is put into the barrel of the composite extruder. After being melted and plasticized, it is extruded through the annular gap of the die and evenly coated on the outer surface of the stainless steel pipe. S6. Curing; The composite pipeline is placed in a constant temperature curing chamber and kept at 60-80℃ for 2-4 hours. After curing, it is naturally cooled to room temperature to obtain an anti-aging encapsulated control pipeline.

3. The method for preparing the anti-aging encapsulated control pipeline as described in claim 2, characterized in that, S1 specifically involves: 300-400 mesh montmorillonite and 200-300 nm carbon black are added to a high-speed mixer at a mass ratio of 1:1.8-2.

4. The mixture is stirred at 800-1200 rpm to ensure initial homogeneity. Silane coupling agent KH-550 or KH-560 is weighed at 0.1-2% of the total mass of the montmorillonite / carbon black mixture and dissolved in anhydrous ethanol to prepare a 5-10% treatment solution. The solution is stirred at 300-500 rpm for 10-15 minutes. This treatment solution is then dripped into the montmorillonite / carbon black mixture. In the carbon black mixture, the dropping rate is controlled at 10-20 mL / min, while the mixer temperature is raised to 80-100℃ and stirred at 1000-1500 rpm for 20-40 min. After processing, the mixture is transferred to a centrifuge and centrifuged at 3000-5000 rpm for 10-15 min to remove the supernatant. The precipitate is placed in a vacuum drying oven and dried at 60-80℃ and a vacuum degree of -0.08 to -0.1 MPa for 12-24 h to remove residual solvent, thus obtaining the composite filler.

4. The method for preparing the anti-aging encapsulated control pipeline as described in claim 2, characterized in that, S2 specifically involves weighing 5-10 parts of calcium stearate, 3-6 parts of zinc stearate, 4-8 parts of epoxidized soybean oil, and 2-5 parts of pentaerythritol according to the proportions, adding them to a high-speed mixer, and mixing for 10-20 minutes at a temperature of 40-60℃ and a stirring speed of 500-800r / min to obtain a calcium-zinc premix. Add 2-5 parts of CSB@Fe3O4 NPs to the above calcium-zinc premix, raise the temperature of the high-speed mixer to 70-90℃, adjust the stirring speed to 600-1000r / min, and react for 1-2 hours. After the reaction is completed, add 1-3 parts of polyethylene wax and continue stirring for 5-10 minutes. Feed the mixture into a twin-screw extruder and granulate it under the conditions of screw speed of 100-150r / min and temperature of 100-130℃. After cooling, the stabilizer is obtained.

5. The method for preparing the anti-aging encapsulated control pipeline as described in claim 2, characterized in that, S3 specifically involves weighing the following raw materials: 70-90 parts of matrix resin, 10-30 parts of composite filler, 0.3-0.8 parts of stabilizer, 0.1-0.3 parts of antioxidant, and 1-2.2 parts of colorant. The antioxidant is composed of the primary antioxidant, hindered amine light stabilizer Tinuvin 152, and the secondary antioxidant, hindered amine light stabilizer UV3853, in a mass ratio of 2:

1. First, the matrix resin and colorant are fed into the main feed port of the twin-screw extruder. The temperatures of each section of the extruder are set as follows: feeding section 160-180℃, melting section 180-200℃, homogenization section 200-220℃, and screw speed 300-400 rpm. After 8-12 minutes, the premix of composite filler and main antioxidant is added through the side feed port. After 2-3 minutes, the auxiliary antioxidant and stabilizer are added through the side feed port. The material stays in the extruder for 2-5 minutes. After melt blending and shear dispersion, it is extruded into strips with a diameter of 3-5 mm through the die head. It is immediately sent to the water cooling tank for cooling and shaping. It is then cut into 2-3 mm long granules by a pelletizer to obtain anti-aging masterbatch.

6. The method for preparing the anti-aging encapsulated control pipeline as described in claim 2, characterized in that, S4 specifically involves: taking a stainless steel seamless tube, soaking it in 95% alcohol for 10-15 minutes to remove surface oil; using sandblasting to roughen the surface of the steel tube and enhance the mechanical interlocking force with the outer layer; immersing the steel tube in an epoxy silane treatment solution with a concentration of 1-3% for 5-10 minutes at room temperature, and then drying it at 80-100℃ for 10-15 minutes to obtain a pretreated stainless steel seamless tube.

7. The method for preparing the anti-aging encapsulation control pipeline as described in claim 2, characterized in that, During sandblasting, the abrasive particle size is 80-120 mesh, the pressure is 0.3-0.5 MPa, and the spray angle is 45°-60°.

8. The method for preparing the anti-aging encapsulation control pipeline as described in claim 2, characterized in that, S5 specifically involves feeding the pretreated seamless stainless steel tube into the center of a composite extrusion die preheated to 180-220℃ using a traction machine. Anti-aging masterbatch is then fed into the barrel of the composite extruder. After melting and plasticizing, it is extruded through the annular gap of the die and evenly coated onto the outer surface of the stainless steel tube. During the coating process, the pressure inside the die is adjusted to 0.5-1.5MPa, while the cooling jacket outside the die is opened. The traction speed is 0.5-2m / min.

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