Corrosion-resistant power cable protection pipe and preparation method thereof

Abstract

The application relates to the technical field of power cables, and discloses a kind of corrosion-resistant power cable protection pipes and preparation methods thereof.A kind of corrosion-resistant power cable protection pipe includes the following components by weight: polypropylene resin 60-70 parts, flame retardant 5-10 parts, inorganic filler 10-15 parts, lubricant 2-4 parts, anti-aging agent 1-2 parts, coupling agent 1-2 parts, toughening agent 4-7 parts, color masterbatch 1-4 parts; the inorganic filler includes cerium-doped rectorite.Through the above technical solution, the problem of insufficient corrosion resistance of the power cable protection pipe in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a corrosion-resistant power cable protection pipe and its preparation method. Background Technology

[0002] As a crucial component of power transmission and distribution systems, power cables rely on their outer protective sheaths for critical protection, effectively safeguarding the integrity of their internal conductors, insulation layers, and other core structures. This makes them particularly suitable for complex and harsh environments. However, in rainy regions, during long-term operation, power cable protective sheaths are susceptible to continuous erosion from rainwater. Acidic media can easily penetrate the sheath, causing cracking, aging, and other damage. This can ultimately compromise the cable's internal structural integrity, leading to power transmission failures and impacting continuous industrial production and the stability of residential electricity supply. Therefore, improving the corrosion resistance of power cable protective sheaths is of paramount importance. Summary of the Invention

[0003] This invention proposes a corrosion-resistant power cable protection pipe and its preparation method, which solves the problem of insufficient corrosion resistance of power cable protection pipes in related technologies.

[0004] The technical solution of the present invention is as follows:

[0005] This invention proposes a corrosion-resistant power cable protection pipe, comprising the following components in parts by weight: 60-70 parts of polypropylene resin, 5-10 parts of flame retardant, 10-15 parts of inorganic filler, 2-4 parts of lubricant, 1-2 parts of anti-aging agent, 1-2 parts of coupling agent, 4-7 parts of toughening agent, and 1-4 parts of color masterbatch.

[0006] The inorganic filler includes cerium-doped raffinite.

[0007] As a further technical solution, the preparation method of the cerium-doped rettoite includes the following steps:

[0008] S1. Add raptolith to water, sonicate, and stir to obtain a raptolith suspension;

[0009] S2. Cerium nitrate is added to the raptorite suspension, and the mixture is ultrasonicated, stirred, centrifuged, washed, dried, and ground to obtain cerium-doped raptorite.

[0010] As a further technical solution, the mass ratio of the attapulgite to water is 1:100~120.

[0011] As a further technical solution, in step S1, the ultrasound duration is 10-15 minutes.

[0012] As a further technical solution, in step S1, the stirring time is 2-3 hours, the stirring speed is 300-400 rpm, and the temperature is room temperature.

[0013] As a further technical solution, the mass ratio of attapulgite to cerium nitrate is 1:5~6.

[0014] As a further technical solution, in step S2, the ultrasound duration is 10-15 minutes.

[0015] As a further technical solution, in step S2, the stirring time is 20~25h, the rotation speed is 300~400rpm, and the temperature is 70~85℃.

[0016] As a further technical solution, the centrifugation speed is 4500~5000 rpm and the time is 5~7 min.

[0017] As a further technical solution, the washing process involves washing three times with deionized water.

[0018] As a further technical solution, the drying temperature is 50~70℃ and the time is 20~30h.

[0019] As a further technical solution, the cerium-doped rettoite has a particle size of 800~1250 mesh.

[0020] As a further technical solution, the inorganic filler also includes one of aluminum borate whiskers and potassium titanate whiskers.

[0021] In this invention, a corrosion-resistant power cable protection pipe incorporates either aluminum borate whiskers or potassium titanate whiskers as an inorganic filler. The whiskers interact with cerium-doped attapulgite. Due to its large specific surface area and excellent adsorption properties, attapulgite allows the whiskers to adsorb onto its surface, enhancing the interfacial bonding between the whiskers and the polypropylene matrix. Furthermore, the whiskers can fill the gaps between the attapulgite particles, further enhancing the internal density of the material. During the tensile process, cerium-doped attapulgite prevents the whiskers from slipping and being pulled out, allowing the whiskers to better exert their reinforcing effect, thereby significantly improving the tensile strength of the corrosion-resistant power cable protection pipe.

[0022] As a further technical solution, when the inorganic filler includes aluminum borate whiskers, the mass ratio of cerium-doped rettosite to aluminum borate whiskers is 1:4~6.

[0023] In the corrosion-resistant power cable protection pipe of the present invention, when the inorganic filler includes aluminum borate whiskers and the mass ratio of cerium-doped attapulgite to aluminum borate whiskers is 1:4~6, the tensile strength of the corrosion-resistant power cable protection pipe is further enhanced. Excessive cerium-doped attapulgite will lead to excessively large whisker spacing, which will prevent the formation of a reinforcing network and weaken the reinforcing effect of the whiskers. On the other hand, when the amount of cerium-doped attapulgite added is insufficient, the bond between the whiskers and the matrix will not be strong enough, which is also not conducive to improving the tensile strength of the corrosion-resistant power cable protection pipe.

[0024] As a further technical solution, the flame retardant includes one or both of intumescent halogen-free flame retardants and melamine polyphosphate.

[0025] As a further technical solution, the lubricant includes one or both of calcium stearate and zinc stearate.

[0026] As a further technical solution, the anti-aging agent includes one or more of antioxidant 1010, antioxidant 168, ultraviolet absorber UV-327, and ultraviolet absorber UV-531.

[0027] In this invention, the addition of an anti-aging agent can effectively inhibit the aging and degradation process of polypropylene under the influence of environmental factors such as light, heat, and oxygen. The anti-aging agent can be one or more of the conventional anti-aging agents in the art, such as antioxidant 1010, antioxidant 1076, antioxidant 168, antioxidant 626, ultraviolet absorber UV-327, and ultraviolet absorber UV-531. Preferably, the anti-aging agent includes one or more of antioxidant 1010, antioxidant 168, ultraviolet absorber UV-327, and ultraviolet absorber UV-531.

[0028] As a further technical solution, the coupling agent includes one or both of silane coupling agents and titanate coupling agents.

[0029] In this invention, the addition of a coupling agent can enhance the interfacial bonding force between the inorganic filler and the polypropylene resin, thereby improving the overall performance of the material. The coupling agent can be one or more of silane coupling agents, titanate coupling agents, and aluminate coupling agents. Preferably, the coupling agent includes one or two of silane coupling agents and titanate coupling agents.

[0030] As a further technical solution, the toughening agent includes one or both of maleic anhydride-grafted polypropylene and ethylene-octene copolymer.

[0031] This invention also proposes a method for preparing a corrosion-resistant power cable protection pipe, which includes the following steps:

[0032] Polypropylene resin, color masterbatch, lubricant, anti-aging agent and coupling agent are mixed, inorganic filler is added and mixed, flame retardant and toughening agent are added and mixed to obtain protective tube mixture, which is then extruded to obtain corrosion-resistant power cable protective tube.

[0033] The working principle and beneficial effects of this invention are as follows:

[0034] In this invention, after cerium-doped attapulgite, cerium ions enter the interlayer of attapulgite, changing the surface charge distribution and chemical activity of attapulgite. This makes attapulgite have a stronger adsorption affinity for corrosive ions, slowing down the erosion of polypropylene resin by corrosive ions. At the same time, in the presence of water and oxygen, cerium ions in the cerium-doped attapulgite on the surface of the protective pipe will form a stable cerium-containing oxide film, which can effectively block the intrusion of corrosive media and greatly improve the corrosion resistance of the power cable protective pipe. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] In the following embodiments and comparative examples,

[0037] Polypropylene resin: Model H2464, manufactured by China National Petroleum Corporation (Daqing Refining & Chemical Branch).

[0038] Laputa: grain size 325 mesh;

[0039] Aluminum borate whiskers: 1 μm in diameter and 10 μm in length;

[0040] Potassium titanate whiskers: 0.5 μm in diameter and 5 μm in length;

[0041] Intumescent halogen-free flame retardant: Model AP-462, manufactured by Clariant Chemicals (China) Co., Ltd.

[0042] Titanate coupling agent: Model number NXH-401, manufacturer: Nanjing Xuanhao New Material Technology Co., Ltd.;

[0043] Maleic anhydride-grafted polypropylene: Model number 50E803, manufactured by DuPont, USA.

[0044] Ethylene-octene copolymer: model number 8480, manufactured by Dow Chemical Company, USA;

[0045] Red masterbatch: Model KL-4870, manufactured by Langfang Zhehang Building Materials Co., Ltd.

[0046] Example 1

[0047] A corrosion-resistant power cable protection pipe comprises the following components in parts by weight: 60 parts polypropylene resin, 5 parts melamine polyphosphate, 10 parts inorganic filler, 2 parts calcium stearate, 0.6 parts antioxidant 1010, 0.4 parts ultraviolet absorber UV-327, 1 part silane coupling agent KH550, 4 parts maleic anhydride grafted polypropylene, and 1 part red masterbatch.

[0048] The inorganic filler is cerium-doped raphe.

[0049] The preparation method of cerium-doped rettoite includes the following steps:

[0050] Add raptosite to water (raptosite to water mass ratio of 1:100), sonicate for 10 min, and stir at room temperature at 300 rpm for 3 h to obtain raptosite suspension.

[0051] Cerium nitrate was added to the raptosite suspension (the mass ratio of raptosite to cerium nitrate was 1:5), sonicated for 10 min, stirred at 70℃ and 400 rpm for 20 h, centrifuged at 4500 rpm for 7 min, washed three times with deionized water, dried at 50℃ for 30 h, and ground to obtain cerium-doped raptosite with a particle size of 800 mesh.

[0052] A method for preparing a corrosion-resistant power cable protection pipe includes the following steps:

[0053] Polypropylene resin, red masterbatch, calcium stearate, antioxidant 1010, ultraviolet absorber UV-327, and silane coupling agent KH550 are stirred at 400 r / min for 5 min. Then, inorganic filler is added and stirred at 800 r / min for 5 min. Finally, melamine polyphosphate and maleic anhydride-grafted polypropylene are added and stirred at 400 r / min for 5 min to obtain the protective tube mixture. The protective tube mixture is extruded and molded to obtain a corrosion-resistant power cable protective tube.

[0054] Example 2

[0055] A corrosion-resistant power cable protection pipe comprises the following components in parts by weight: 70 parts polypropylene resin, 10 parts intumescent halogen-free flame retardant, 15 parts inorganic filler, 4 parts zinc stearate, 1.2 parts antioxidant 168, 0.8 parts ultraviolet absorber UV-327, 2 parts titanate coupling agent, 7 parts ethylene-octene copolymer, and 4 parts red masterbatch.

[0056] The inorganic filler is cerium-doped raphe.

[0057] The preparation method of cerium-doped rettoite includes the following steps:

[0058] Add raptosite to water (raptosite to water mass ratio of 1:120), sonicate for 15 min, and stir at room temperature at 400 rpm for 2 h to obtain raptosite suspension.

[0059] Cerium nitrate was added to the raptosite suspension (the mass ratio of raptosite to cerium nitrate was 1:6), sonicated for 15 min, stirred at 85℃ and 300 rpm for 25 h, centrifuged at 5000 rpm for 5 min, washed three times with deionized water, dried at 70℃ for 20 h, and ground to obtain cerium-doped raptosite with a particle size of 1250 mesh.

[0060] A method for preparing a corrosion-resistant power cable protection pipe includes the following steps:

[0061] Polypropylene resin, red masterbatch, zinc stearate, antioxidant 168, UV absorber UV-327 and titanate coupling agent are stirred at 400 r / min for 5 min. Then, inorganic filler is added and stirred at 800 r / min for 5 min. Finally, intumescent halogen-free flame retardant and ethylene-octene copolymer are added and stirred at 400 r / min for 5 min to obtain the protective tube mixture. The protective tube mixture is extruded to obtain a corrosion-resistant power cable protective tube.

[0062] Example 3

[0063] A corrosion-resistant power cable protection pipe comprises the following components in parts by weight: 65 parts polypropylene resin, 7 parts intumescent halogen-free flame retardant, 12 parts inorganic filler, 3 parts calcium stearate, 1.0 part antioxidant 1010, 0.5 parts ultraviolet absorber UV-531, 1.5 parts silane coupling agent KH550, 5 parts maleic anhydride-grafted polypropylene, and 2.5 parts red masterbatch;

[0064] The inorganic filler is cerium-doped raphe.

[0065] The preparation method of cerium-doped rettoite includes the following steps:

[0066] Add raptosite to water (raptosite to water mass ratio of 1:110), sonicate for 12 min, and stir at room temperature at 350 rpm for 2.5 h to obtain raptosite suspension.

[0067] Cerium nitrate was added to the raptosite suspension (the mass ratio of raptosite to cerium nitrate was 1:5.2), sonicated for 13 min, stirred at 80℃ and 350 rpm for 24 h, centrifuged at 4800 rpm for 6 min, washed three times with deionized water, dried at 60℃ for 24 h, and ground to obtain cerium-doped raptosite with a particle size of 800 mesh.

[0068] A method for preparing a corrosion-resistant power cable protection pipe includes the following steps:

[0069] Polypropylene resin, red masterbatch, calcium stearate, antioxidant 1010, ultraviolet absorber UV-531, and silane coupling agent KH550 are stirred at 400 r / min for 5 min. Then, inorganic filler is added and stirred at 800 r / min for 5 min. Finally, intumescent halogen-free flame retardant and maleic anhydride-grafted polypropylene are added and stirred at 400 r / min for 5 min to obtain the protective tube mixture. The protective tube mixture is extruded and molded to obtain a corrosion-resistant power cable protective tube.

[0070] Example 4

[0071] The only difference between this embodiment and Embodiment 3 is that the inorganic filler is cerium-doped raptoite and aluminum borate whiskers in a mass ratio of 1:3.

[0072] A method for preparing a corrosion-resistant power cable protection pipe includes the following steps:

[0073] Cerium-doped rettoite and aluminum borate whiskers were mixed at 200 r / min for 5 min to obtain an inorganic filler.

[0074] Polypropylene resin, red masterbatch, calcium stearate, antioxidant 1010, ultraviolet absorber UV-531, and silane coupling agent KH550 are stirred at 400 r / min for 5 min. Then, inorganic filler is added and stirred at 800 r / min for 5 min. Finally, intumescent halogen-free flame retardant and maleic anhydride-grafted polypropylene are added and stirred at 400 r / min for 5 min to obtain the protective tube mixture. The protective tube mixture is extruded and molded to obtain a corrosion-resistant power cable protective tube.

[0075] Example 5

[0076] The only difference between this embodiment and Embodiment 3 is that the inorganic filler is cerium-doped raptoite and potassium titanate whiskers in a mass ratio of 1:3.

[0077] A method for preparing a corrosion-resistant power cable protection pipe includes the following steps:

[0078] Cerium-doped rettoite and potassium titanate whiskers were mixed at 200 r / min for 5 min to obtain an inorganic filler.

[0079] Polypropylene resin, red masterbatch, calcium stearate, antioxidant 1010, ultraviolet absorber UV-531, and silane coupling agent KH550 are stirred at 400 r / min for 5 min. Then, inorganic filler is added and stirred at 800 r / min for 5 min. Finally, intumescent halogen-free flame retardant and maleic anhydride-grafted polypropylene are added and stirred at 400 r / min for 5 min to obtain the protective tube mixture. The protective tube mixture is extruded and molded to obtain a corrosion-resistant power cable protective tube.

[0080] Example 6

[0081] The only difference between this embodiment and Embodiment 4 is that the inorganic filler is cerium-doped rettoite and aluminum borate whiskers in a mass ratio of 1:4.

[0082] Example 7

[0083] The only difference between this embodiment and Embodiment 4 is that the inorganic filler is cerium-doped rettoite and aluminum borate whiskers in a mass ratio of 1:6.

[0084] Example 8

[0085] The only difference between this embodiment and Embodiment 4 is that the inorganic filler is cerium-doped rettoite and aluminum borate whiskers in a mass ratio of 1:7.

[0086] Comparative Example 1

[0087] The only difference between this comparative example and Example 3 is that the inorganic filler is aluminum borate whiskers.

[0088] Comparative Example 2

[0089] The only difference between this comparative example and Example 3 is that the inorganic filler is attapulgite.

[0090] The corrosion-resistant power cable protection pipes prepared in Examples 1-8 and Comparative Examples 1-2 were tested according to the following methods:

[0091] Corrosion resistance test: The sample was immersed in a 6% hydrochloric acid solution for 10 days, and the tensile strength before and after the hydrochloric acid solution treatment was tested.

[0092] Tensile strength: Tested according to GB / T 1040.3-2006 "Determination of tensile properties of plastics - Part 3: Test conditions for films and sheets", using type 1B specimens.

[0093] The test results are shown in Table 1:

[0094] Table 1 Performance test results of corrosion-resistant power cable protection pipes prepared in Examples 1-8 and Comparative Examples 1-2

[0095]

[0096] 1. Compared with Comparative Example 2, the change in tensile strength of the corrosion-resistant power cable protection pipes prepared in Examples 1-8 after treatment with hydrochloric acid solution was much lower than that in Comparative Example 2, indicating that the addition of cerium-doped retardant can significantly improve the corrosion resistance of the corrosion-resistant power cable protection pipes.

[0097] 2. Compared with Comparative Example 1, the tensile strength of the corrosion-resistant power cable protection pipes prepared in Examples 4-8 is higher than that in Examples 3 and Comparative Example 1, indicating that the inorganic filler is one of aluminum borate whiskers and potassium titanate whiskers, which, together with cerium-doped attapulgite, can further improve the tensile strength of the corrosion-resistant power cable protection pipe. Compared with Examples 4-5, the tensile strength of the corrosion-resistant power cable protection pipe prepared in Example 4 is better, indicating that using cerium-doped attapulgite and aluminum borate whiskers together can better improve the tensile strength of the corrosion-resistant power cable protection pipe.

[0098] 3. Compared with Examples 4 and 6-8, the tensile strength of the corrosion-resistant power cable protection pipes prepared in Examples 6-7 is higher than that in Examples 4 and 8, indicating that when the inorganic filler is cerium-doped rettoite and aluminum borate whiskers with a mass ratio of 1:4-6, the tensile strength of the corrosion-resistant power cable protection pipe is further improved.

[0099] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A corrosion-resistant power cable protection pipe, characterized in that, It includes the following components in parts by weight: 60-70 parts polypropylene resin, 5-10 parts flame retardant, 10-15 parts inorganic filler, 2-4 parts lubricant, 1-2 parts anti-aging agent, 1-2 parts coupling agent, 4-7 parts toughening agent, and 1-4 parts color masterbatch. The inorganic filler comprises cerium-doped rettoite and aluminum borate whiskers in a mass ratio of 1:4 to 6.

2. The corrosion-resistant power cable protection pipe according to claim 1, characterized in that, The preparation method of the cerium-doped rettosite includes the following steps: S1. Add raptolith to water, sonicate, and stir to obtain a raptolith suspension; S2. Cerium nitrate is added to the raptorite suspension, and the mixture is ultrasonicated, stirred, centrifuged, washed, dried, and ground to obtain cerium-doped raptorite.

3. The corrosion-resistant power cable protection pipe according to claim 2, characterized in that, The mass ratio of rettosite to water is 1:100~120.

4. The corrosion-resistant power cable protection pipe according to claim 2, characterized in that, The mass ratio of rettosite to cerium nitrate is 1:5~6; In step S2, the stirring time is 20-25 hours, the stirring speed is 300-400 rpm, and the temperature is 70-85℃. The cerium-doped rettoite has a particle size of 800-1250 mesh.

5. The corrosion-resistant power cable protection pipe according to claim 1, characterized in that, The flame retardant includes one or both of intumescent halogen-free flame retardants and melamine polyphosphate; The lubricant includes one or both of calcium stearate and zinc stearate.

6. The corrosion-resistant power cable protection pipe according to claim 1, characterized in that, The anti-aging agent includes one or more of antioxidant 1010, antioxidant 168, ultraviolet absorber UV-327, and ultraviolet absorber UV-531; The coupling agent includes one or both of silane coupling agents and titanate coupling agents.

7. The corrosion-resistant power cable protection pipe according to claim 1, characterized in that, The toughening agent includes one or both of maleic anhydride-grafted polypropylene and ethylene-octene copolymer.

8. A method for preparing a corrosion-resistant power cable protection pipe, used to prepare the corrosion-resistant power cable protection pipe according to any one of claims 1 to 7, characterized in that, Includes the following steps: Polypropylene resin, color masterbatch, lubricant, anti-aging agent and coupling agent are mixed, inorganic filler is added and mixed, flame retardant and toughening agent are added and mixed to obtain protective tube mixture, which is then extruded to obtain corrosion-resistant power cable protective tube.

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