Corrosion-resistant power cable and preparation method thereof
Patent Information
- Application Number
- CN202510893631.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-30
- Publication Date
- 2025-10-17
Smart Images
Figure SMS_1
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of cables, in particular, it relates to a kind of corrosion-resistant power cable and preparation method thereof. BACKGROUND
[0002] As the key carrier of power transmission, power cable is widely used in various power engineering, from urban power grid construction to industrial plant power supply, to power matching of large infrastructure projects, its performance and quality directly affect the safe operation of the entire power system. Among them, corrosion resistance is one of the important indicators to measure the quality and service life of power cable, especially in some special environments, such as chemical industry park, marine environment, humid and rainy area, etc., the corrosion resistance of cable directly determines whether it can work stably for a long time.
[0003] The existing corrosion-resistant power cable is often difficult to meet the actual demand in the face of some corrosive environments. For example, in the environment of strong acid, strong alkali or high concentration organic solvent, the sheath layer material of part of the cable will undergo obvious chemical degradation, resulting in the thinning, cracking and even peeling of the sheath layer, so that the internal insulation layer and conductor are exposed to the corrosive environment, causing cable failure. In addition, the corrosion resistance of some cables will gradually decrease under the condition of long-term immersion in seawater or attachment and erosion of marine organisms, affecting the normal service life of the cable.
[0004] In order to achieve good corrosion resistance, some cables use relatively soft but low mechanical strength sheath layer materials. Although these materials perform well in chemical corrosion resistance, they are easily damaged by external pressure, stretching or wear during cable laying and use, resulting in the electrical performance of the cable being affected. On the contrary, some sheath layer materials with high mechanical strength may have relatively insufficient corrosion resistance, which cannot work stably for a long time in harsh corrosive environments. Therefore, how to ensure the corrosion resistance of the cable while considering its mechanical properties is a big problem faced by current corrosion-resistant power cable research and development. In order to solve the above technical problems, the present application proposes a new corrosion-resistant power cable. SUMMARY
[0005] The present application proposes a kind of corrosion-resistant power cable and preparation method thereof, improve the existing corrosion-resistant power cable in corrosive environment easy to appear sheath layer chemical degradation, thinning, cracking, peeling, cause internal insulation layer and conductor exposure to cause failure, and in seawater immersion or marine organisms attachment and erosion under the condition of corrosion resistance decline influence normal service life problem;Improve the ability of corrosion-resistant power cable to ensure corrosion resistance while considering mechanical properties.
[0006] The technical scheme of the present application is as follows: In a first aspect, the present application provides a kind of corrosion-resistant power cable, sequentially arranged conductor layer, insulating layer and sheath layer from inside to outside, the sheath layer includes the following raw materials by weight: polyvinyl chloride 50-60 parts, hydrogenated nitrile rubber 30-40 parts, BNT-Re@PFOTES filler 12-15 parts, dioctyl terephthalate 6-8 parts, vulcanizing agent DCP 2-3 parts, octyl tin mercaptide 1.3-1.7 parts, antioxidant 1-2 parts, ultraviolet absorber 0.5-1 part, calcium stearate 0.5-0.9 part;Wherein, BNT-Re@PFOTES filler is obtained by using perfluorooctyl triethoxysilane treatment to rare earth modified boron nitride@polydopamine.
[0007] As a further technical solution, the insulating layer is polyvinyl chloride.
[0008] As a further technical solution, the preparation method of the boron nitride@polydopamine includes: ultrasonic dispersion of hydrochloric acid dopamine and tris-hydroxymethyl aminomethane in a mixture of ethanol, methanol and water, adding boron nitride nanotube, reacting at 65-75 DEG C for 9-11 h to form boron nitride@polydopamine.
[0009] As a further technical solution, the amount ratio of hydrochloric acid dopamine, tris-hydroxymethyl aminomethane, ethanol, methanol, water and boron nitride nanotube is 1.4-1.6 g:0.2-0.4 g:45-55 mL:45-55 mL:90-110 mL:0.25-0.35 g.
[0010] As a further technical solution, the rare earth modification step includes: dispersing cerium nitrate and lanthanum nitrate in water, adding boron nitride@polydopamine, adjusting pH to 5.5, oscillating adsorption for 10-14 h, and calcining at 350-450 DEG C for 100-140 min to obtain BNT-Re.
[0011] As a further technical solution, the amount ratio of boron nitride@polydopamine, cerium nitrate, lanthanum nitrate and water is 1 g:0.05-0.3 g:0.05-0.3 g:50-100 mL.
[0012] As a further technical solution, the treatment step of perfluorooctyl triethoxysilane includes: dispersing perfluorooctyl triethoxysilane in ethanol and water, then adding rare earth modified boron nitride@polydopamine, stirring at 40-60 DEG C under nitrogen protection and 200-300 rpm for 10-12 h, centrifuging, washing and drying to obtain.
[0013] As a further technical solution, the amount ratio of perfluorooctyl triethoxysilane, ethanol and rare earth modified boron nitride@polydopamine is 1 g:50-100 mL:10-20 g.
[0014] As a further technical solution, the antioxidant comprises antioxidant 1010 and antioxidant 168 in a weight ratio of 1:2-3; and the ultraviolet absorber is at least one of benzotriazole UV-326, 327 and 328.
[0015] In a second aspect, the application provides a preparation method of a corrosion-resistant power cable, comprising the following steps: drying BNT-Re@F filler at a temperature of 75-85 DEG C for 4-5 h, adding polyvinyl chloride, octyltin mercaptide, calcium stearate and 1 / 3 weight parts of dioctyl terephthalate into a high-speed mixer, mixing at 75-85 DEG C for 5-7 min to form a base material, mixing the base material with other remaining materials to obtain a mixing compound, extruding and granulating the mixing compound in a single-screw extruder to obtain a sheath material, preheating a conductor layer to 110±5 DEG C, and extruding and coating the insulation layer and the sheath layer on the conductor layer by using a multi-layer co-extrusion device, and winding to obtain the corrosion-resistant power cable.
[0016] As a further technical solution, the mixing step comprises: sequentially adding hydrogenated nitrile rubber and the remaining dioctyl terephthalate into a mixing machine, plasticating at 45-55 DEG C for 2-3 min; adding the base material, the antioxidant and the ultraviolet absorber, heating to 150-160 DEG C and mixing for 2-4 min, adding the BNT-Re@F filler in three batches with an interval of 1 min, and finally adding the vulcanizing agent DCP and mixing at 155-160 DEG C for 8-10 min.
[0017] The working principle and beneficial effects of the application are as follows: The application provides a corrosion-resistant power cable sheath material based on a triple-modified BNT-Re@PFOTES filler. Through the synergistic effect of polydopamine coating, rare earth modification and perfluorosilane treatment, the mechanical strength, heat aging resistance and chemical stability of the cable are significantly improved.
[0018] The polydopamine in the application has excellent adhesion and biocompatibility, and can form a uniform coating layer on the surface of boron nitride nanotubes, enhancing the dispersibility and interfacial bonding force of boron nitride in the polymer matrix. This enables boron nitride to be more uniformly distributed in the sheath material, improving the uniformity and stability of the internal structure of the material and reducing problems such as chemical degradation, thinning and cracking caused by local structural defects, thereby better protecting the internal insulation layer and conductor.
[0019] The cerium / lanthanum rare earth elements in the application have unique electronic structure and chemical properties, which can coordinate with the functional groups on the polymer chain to form a thermally stable complex. At high temperatures, these complexes can stabilize the structure of the polymer chain and prevent chain rupture and degradation reactions. At the same time, the rare earth elements can also capture free radicals, reducing the attack of free radicals on the polymer chain, further improving the thermal stability and aging resistance of the material.
[0020] The PFOTES hydrophobic layer in the application effectively blocks the penetration of corrosive media. PFOTES is a perfluorosilane compound, which has low surface energy and excellent hydrophobicity. When it is treated on the surface of BNT-Re, a dense hydrophobic film will be formed on the surface. This hydrophobic film can reduce the surface energy of the sheath layer, making it difficult for corrosive media to adhere and penetrate on its surface. According to the principle of surface chemistry, substances with low surface energy have good resistance to wetting and corrosion, so the PFOTES hydrophobic layer can effectively block the entry of corrosive media such as seawater and marine biological secretions, protecting the sheath layer from corrosion. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the application will be described below in conjunction with the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, not all embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.
[0022] It should be noted that the polyvinyl chloride in the application is purchased from Xinjiang Tianye Co., Ltd., model SG-5; the hydrogenated nitrile rubber is purchased from Japan Zeon, brand 2020, acrylonitrile content 36%, hydrogenation degree 91.
[0023] Embodiment 1 The embodiment provides a corrosion-resistant power cable, which sequentially comprises a conductor layer, an insulating layer and a sheath layer from inside to outside, The insulating layer is polyvinyl chloride, and the sheath layer comprises the following raw materials by weight: polyvinyl chloride 55 parts, hydrogenated nitrile rubber 35 parts, BNT-Re@PFOTES filler 14 parts, dioctyl terephthalate 7 parts, vulcanizing agent DCP 2.5 parts, octyl tin mercaptide 1.5 parts, antioxidant 1.5 parts, ultraviolet absorber 0.8 parts, calcium stearate 0.7 parts; The BNT-Re@PFOTES filler is obtained by treating the rare earth modified boron nitride@polydopamine with perfluorooctyltriethoxysilane; the preparation steps include: 1.5 g of dopamine hydrochloride and 0.3 g of tris-hydroxymethyl aminomethane were ultrasonically dispersed in a mixture of 50 mL of ethanol, 50 mL of methanol and 100 mL of water, 0.3 g of boron nitride nanotubes was added, and the mixture was reacted at 70°C for 10 h to form boron nitride@polydopamine; 0.15 g of cerium nitrate and 0.15 g of lanthanum nitrate were dispersed in 75 mL of water, 1 g of boron nitride@polydopamine was added, the pH was adjusted to 5.5, and the mixture was oscillated and adsorbed for 12 h, and then calcined at 400°C for 120 min to obtain BNT-Re; 1 g of perfluorooctyltriethoxysilane was dispersed in 75 mL of ethanol and water, and then 15 g of rare earth modified boron nitride@polydopamine was added, and the mixture was stirred at 45°C under nitrogen protection at 250 rpm for 11 h, centrifuged at 10,000 rpm for 10 min, washed with anhydrous ethanol for 3 times, and vacuum dried at 70°C for 10 h to obtain BNT-Re@PFOTES filler; The antioxidant includes antioxidant 1010 and antioxidant 168 in a weight ratio of 1:2.5; and the ultraviolet absorber is benzotriazole UV-326; The preparation method of the corrosion-resistant power cable comprises the following steps: drying the BNT-Re@F filler at 80°C for 4.5 h, adding polyvinyl chloride, octyl tin mercaptide, calcium stearate and 1 / 3 parts of dioctyl terephthalate by weight into a high-speed mixer, mixing at 80°C for 6 min to form a base, adding hydrogenated butadiene rubber and the remaining dioctyl terephthalate into an internal mixer, and plasticating at 50°C for 2.5 min; adding the base, the antioxidant and the ultraviolet absorber, and mixing at 155°C for 3 min, adding the BNT-Re@F filler in three batches with an interval of 1 min, and finally adding the vulcanizing agent DCP and mixing in the internal mixer at 158°C for 9 min to obtain a mixing material; and melting, extruding, water-cooling and pelletizing the mixing material in a single-screw extruder at four zone temperatures of 120°C, 135°C, 145°C and 140°C, respectively, and drying the pellets in a fluidized bed at 50°C for 1 h to obtain a sheath material. The conductor layer is preheated to 110°C, and the sheath material and the insulating layer raw material polyvinyl chloride are used to extrude the insulating layer and the sheath layer on the conductor layer by using a multi-layer co-extrusion device, wherein the polyvinyl chloride is used to coat the conductor at a zone temperature of 140°C, a second zone temperature of 150°C, a third zone temperature of 155°C and a die temperature of 150°C, and the outer sheath material is used to coat the insulating layer at a zone temperature of 145°C, a second zone temperature of 155°C, a third zone temperature of 160°C and a die temperature of 155°C, and then the sheath material and the insulating layer are introduced into a 0.8 MPa, 180°C saturated steam vulcanization pipeline, and vulcanized at a line speed of 3.5 m / min for 7 min, and then slowly cooled by water mist at 60°C, and then immersed in water at 25°C for shaping, and finally wound to obtain the corrosion-resistant power cable.
[0024] Example 2 The embodiment provides a corrosion-resistant power cable, which is sequentially provided with a conductor layer, an insulation layer and a sheath layer from inside to outside, The insulation layer is polyvinyl chloride, and the sheath layer comprises the following raw materials in parts by weight: 50 parts of polyvinyl chloride, 30 parts of hydrogenated butyl rubber, 12 parts of BNT-Re@PFOTES filler, 6 parts of dioctyl terephthalate, 2 parts of vulcanizing agent DCP, 1.3 parts of octyl tin mercaptide, 1 part of antioxidant, 0.5 part of ultraviolet absorber, and 0.5 part of calcium stearate; The BNT-Re@PFOTES filler is obtained by treating rare earth modified boron nitride@polydopamine with perfluorooctyltriethoxysilane; the preparation steps comprise the following steps: 1.4g of dopamine hydrochloride and 0.2g of tris(hydroxymethyl)aminomethane are ultrasonically dispersed in a mixture of 45mL of ethanol, 45mL of methanol and 90mL of water, 0.25g of boron nitride nanotube is added, and reaction is carried out at 65°C for 9h to form boron nitride@polydopamine; 0.05g of cerium nitrate and 0.05g of lanthanum nitrate are dispersed in 50mL of water, 1g of boron nitride@polydopamine is added, the pH is adjusted to 5.5, oscillation adsorption is carried out for 10h, and then calcination is carried out at a temperature of 350°C for 100min to obtain BNT-Re; 1g of perfluorooctyltriethoxysilane is dispersed in 50mL of ethanol and water, then 10g of rare earth modified boron nitride@polydopamine is added, and reaction is carried out under nitrogen protection, stirring at 40°C and 200rpm for 10h, centrifugal separation at 8000rpm for 10min, washing with anhydrous ethanol for 3 times, and vacuum drying at 60°C for 8h to obtain the BNT-Re@PFOTES filler; The antioxidant comprises antioxidant 1010 and antioxidant 168 in a weight ratio of 1:2; and the ultraviolet absorber is benzotriazole UV-327; The preparation method of the corrosion-resistant power cable comprises the following steps: the BNT-Re@F filler is dried at a temperature of 75°C for 4h, polyvinyl chloride, octyl tin mercaptide, calcium stearate and 1 / 3 parts by weight of dioctyl terephthalate are added into a high-speed mixer, mixed at 75°C for 5min to form a base material, hydrogenated butyl rubber and the remaining dioctyl terephthalate are sequentially added into a banbury mixer, and plasticating is carried out at 45°C for 2min; the base material, the antioxidant and the ultraviolet absorber are added, and mixing is carried out at a temperature of 150°C for 2min; the BNT-Re@F filler is added in three batches, and each batch is separated by 1min; finally, the vulcanizing agent DCP is added, and banburying is carried out at 155°C for 8min to obtain a banburying material; the banburying material is added into a single-screw extruder, and is melt-extruded, water-cooled and pelletized at four-zone temperatures of 120°C, 135°C, 145°C and 140°C; and the sheath material is obtained by fluidized bed drying at 50°C for 1h. The conductor layer is preheated to 110℃, and the sheath material and the insulating layer raw material polyvinyl chloride are used to extrude the insulating layer and the sheath layer on the conductive layer by using a multi-layer co-extrusion device, wherein the polyvinyl chloride is used to coat the conductor at a temperature of 140℃ in the first zone, 150℃ in the second zone, 155℃ in the third zone, and 150℃ at the die head; the outer sheath material is used to coat the insulating layer at a temperature of 145℃ in the first zone, 155℃ in the second zone, 160℃ in the third zone, and 155℃ at the die head; then it enters a 0.8MPa, 180℃ saturated steam vulcanization pipeline, and is vulcanized at a line speed of 3.5m / min for 7min, and then is slowly cooled by 60℃ water mist, and then is immersed in 25℃ water for shaping, and finally is wound up to obtain the corrosion-resistant power cable.
[0025] Example 3 The present embodiment provides a corrosion-resistant power cable, which sequentially comprises a conductor layer, an insulating layer, and a sheath layer from inside to outside, The insulating layer is polyvinyl chloride, and the sheath layer comprises the following raw materials in parts by weight: polyvinyl chloride 60 parts, hydrogenated nitrile rubber 40 parts, BNT-Re@PFOTES filler 15 parts, dioctyl terephthalate 8 parts, vulcanizing agent DCP 3 parts, octyl tin mercaptide 1.7 parts, antioxidant 2 parts, ultraviolet absorber 1 part, and calcium stearate 0.9 parts; The BNT-Re@PFOTES filler is obtained by treating rare earth modified boron nitride@polydopamine with perfluorooctyltriethoxysilane; the preparation steps comprise: 1.6g of dopamine hydrochloride and 0.4g of tris(hydroxymethyl)aminomethane are ultrasonically dispersed in a mixture of 55mL of ethanol, 55mL of methanol, and 110mL of water, 0.35g of boron nitride nanotubes is added, and the mixture is reacted at 75℃ for 11h to form boron nitride@polydopamine; 0.3g of cerium nitrate and 0.3g of lanthanum nitrate are dispersed in 100mL of water, 1g of boron nitride@polydopamine is added, the pH is adjusted to 5.5, and the mixture is oscillated and adsorbed for 14h, and then is calcined at a temperature of 450℃ for 140min to obtain BNT-Re; 1g of perfluorooctyltriethoxysilane is dispersed in 100mL of ethanol and water, and then 20g of rare earth modified boron nitride@polydopamine is added, and the mixture is stirred at 60℃ and 300rpm for 12h under nitrogen protection, and then is centrifuged at 12000rpm for 10min, and is washed with anhydrous ethanol for 3 times, and is vacuum dried at 80℃ for 12h to obtain the BNT-Re@PFOTES filler; The antioxidant comprises antioxidant 1010 and antioxidant 168 in a weight ratio of 1:3; and the ultraviolet absorber is at least one of benzotriazole UV-328; The preparation method of the corrosion-resistant power cable comprises the following steps: drying BNT-Re@F fillers at 85℃ for 5 hours; adding polyvinyl chloride, octyltin mercaptide, calcium stearate and 1 / 3 weight parts of dioctyl terephthalate into a high-speed mixer and mixing at 85℃ for 7 minutes to form a base material; adding hydrogenated butadiene rubber and the remaining dioctyl terephthalate into a plasticator and plasticating at 55℃ for 3 minutes; adding the base material, an antioxidant and an ultraviolet absorber, and heating to 160℃ for 4 minutes; adding the BNT-Re@F fillers in three batches with an interval of 1 minute; and finally adding a vulcanizing agent DCP and plasticating at 160℃ for 10 minutes to obtain a plasticated material; melting, extruding, water-cooling and granulating the plasticated material in a single-screw extruder at four zone temperatures of 120℃, 135℃, 145℃ and 140℃ respectively; and drying the granules in a fluidized bed at 50℃ for 1 hour to obtain a sheath material; The conductor layer is preheated to 110℃, and the sheath material and the insulating layer raw material polyvinyl chloride are used to extrude the insulating layer and the sheath layer on the conductor layer by using a multi-layer co-extrusion device, wherein the polyvinyl chloride is used to coat the conductor at a zone temperature of 140℃, a second zone temperature of 150℃, a third zone temperature of 155℃ and a die temperature of 150℃, and the outer sheath material is used to coat the insulating layer at a zone temperature of 145℃, a second zone temperature of 155℃, a third zone temperature of 160℃ and a die temperature of 155℃, and then the sheath material and the insulating layer are fed into a 0.8MPa, 180℃ saturated steam vulcanization pipeline for vulcanization at a line speed of 3.5m / min for 7 minutes, and then the sheath material and the insulating layer are cooled by water mist at 60℃ and then immersed in water at 25℃ for shaping, and finally the sheath material and the insulating layer are wound to obtain the corrosion-resistant power cable.
[0026] Example 4 The corrosion-resistant power cable comprises, from inside to outside, a conductor layer, an insulating layer and a sheath layer, The insulating layer is polyvinyl chloride, and the sheath layer comprises the following raw materials in parts by weight: polyvinyl chloride 50 parts, hydrogenated butadiene rubber 40 parts, BNT-Re@PFOTES fillers 12 parts, dioctyl terephthalate 8 parts, vulcanizing agent DCP 2 parts, octyltin mercaptide 1.7 parts, antioxidant 1 part, ultraviolet absorber 1 part and calcium stearate 0.5 part; The BNT-Re@PFOTES fillers are obtained by treating rare earth modified boron nitride@polydopamine with perfluorooctyltriethoxysilane; and the preparation steps comprise the following steps: 1.6g of hydrochloric acid dopamine and 0.2g of tris-hydroxymethyl aminomethane are ultrasonically dispersed in a mixture of 55mL of ethanol, 45mL of methanol and 110mL of water, 0.25g of boron nitride nanotubes are added, and the mixture is reacted at 75℃ for 9 hours to form boron nitride@polydopamine; 0.3 g cerium nitrate, 0.05 g lanthanum nitrate was dispersed in 100 mL water, 1 g boron nitride modified by rare earth @ polydopamine was added, the pH was adjusted to 5.5, and after oscillation adsorption for 10 h, calcination was carried out at a temperature of 450℃ for 100 min to obtain BNT-Re; 1 g perfluorooctyltriethoxysilane was dispersed in 100 mL ethanol and water, then 10 g boron nitride modified by rare earth @ polydopamine was added, and the reaction was carried out under nitrogen protection, stirring at 60℃, 200 rpm for 12 h, centrifugal separation at 8000 rpm for 10 min, washing with anhydrous ethanol for 3 times, and vacuum drying at 80℃ for 8 h to obtain BNT-Re@PFOTES filler; Among them, the antioxidant includes antioxidant 1010 and antioxidant 168 in a weight ratio of 1:3; the ultraviolet absorber is benzotriazole UV-326; The preparation method of the corrosion-resistant power cable comprises the following steps: drying the BNT-Re@F filler at a temperature of 75℃ for 5h, adding polyvinyl chloride, octyl tin mercaptan, calcium stearate and 1 / 3 weight parts of dioctyl terephthalate into a high-speed mixer, mixing at 75℃ for 7 min to form a base material, adding hydrogenated butadiene rubber and the remaining dioctyl terephthalate into an internal mixer in sequence, and plasticating at 45℃ for 3 min; adding the base material, the antioxidant and the ultraviolet absorber, and mixing at 150℃ for 4 min; adding the BNT-Re@F filler in three batches with an interval of 1 min; and finally adding the vulcanizing agent DCP and mixing in the internal mixer at 155℃ for 10 min to obtain a mixing material, melting and extruding the mixing material in a single-screw extruder at four zone temperatures of 120℃, 135℃, 145℃ and 140℃ in sequence, water-cooling and pelletizing, and drying in a fluidized bed at 50℃ for 1h to obtain a sheath material. The conductor layer is preheated to 110℃, the sheath material and the insulating layer raw material polyvinyl chloride are used to extrude the insulating layer and the sheath layer on the conductive layer by using a multi-layer co-extrusion device, wherein the polyvinyl chloride is used to coat the conductor at a zone temperature of 140℃, a second zone temperature of 150℃, a third zone temperature of 155℃ and a die temperature of 150℃, and the outer sheath material is used to coat the insulating layer at a zone temperature of 145℃, a second zone temperature of 155℃, a third zone temperature of 160℃ and a die temperature of 155℃, and then enters a 0.8 MPa, 180℃ saturated steam vulcanization pipeline, and is vulcanized at a line speed of 3.5 m / min for 7 min, is slowly cooled by 60℃ water mist first, is immersed in water at 25℃ for shaping, and finally is wound up to obtain the corrosion-resistant power cable.
[0027] Comparative Example 1 On the basis of Example 1, adjustments are made, and the BNT-Re@PFOTES filler is not treated with perfluorooctyltriethoxysilane, but is replaced with an equal amount of BNT-Re, which is different from Example 1.
[0028] Comparative Example 2 Adjustment is made on the basis of Example 1, which is different from Example 1 in that the BNT-Re@PFOTES filler is replaced with boron nitride@polydopamine of the same mass.
[0029] Comparative Example 3 Adjustment is made on the basis of Example 1, which is different from Example 1 in that the BNT-Re@PFOTES filler is not modified by rare earth elements, and the boron nitride@polydopamine is directly treated with perfluorooctyltriethoxysilane; that is, the rare earth modified boron nitride@polydopamine is replaced with boron nitride@polydopamine in the preparation of the final filler.
[0030] Comparative Example 4 Adjustment is made on the basis of Example 1, which is different from Example 1 in that the BNT-Re@PFOTES filler is replaced with boron nitride nanotubes treated with perfluorooctyltriethoxysilane; that is, the rare earth modified boron nitride@polydopamine is replaced with boron nitride in the preparation of the final filler.
[0031] Comparative Example 5 Adjustment is made on the basis of Example 1, which is different from Example 1 in that the original boron nitride nanotubes are directly used to adsorb rare earth; that is, the rare earth modification step is adjusted as follows: 0.05 g of cerium nitrate and 0.05 g of lanthanum nitrate are dispersed in 50 mL of water, 1 g of boron nitride nanotubes is added, the pH is adjusted to 5.5, and after oscillation adsorption for 10 h, calcination is carried out at a temperature of 350℃ for 100 min to obtain boron nitride-Re; the obtained boron nitride-Re is then treated with perfluorooctyltriethoxysilane; the steps are the same as in Example 1, and only the rare earth modified boron nitride@polydopamine is replaced with boron nitride-Re.
[0032] Comparative Example 6 Adjustment is made on the basis of Example 1, which is different from Example 1 in that the BNT-Re@PFOTES filler is replaced with boron nitride nanotubes of the same mass.
[0033] Comparative Example 7 Adjustment is made on the basis of Example 1, which is different from Example 1 in that the amount of BNT-Re@PFOTES filler is adjusted to 7 parts.
[0034] Comparative Example 8 Adjustment is made on the basis of Example 1, which is different from Example 1 in that the amount of BNT-Re@PFOTES filler is adjusted to 28 parts.
[0035] Test Example 1: The corrosion-resistant power cables prepared in the foregoing Examples 1-4 and Comparative Examples 1-8 are tested as follows: Tensile strength: tested in accordance with GB / T 2951.12-2008; Low temperature impact embrittlement: test according to GB / T 5470-2008; Heat aging resistance: test according to GB / T 3512-2014, put the sample in 120℃ oven for 168 hours, test the tensile strength after aging, calculate the change rate of tensile strength; Corrosion resistance: put the sheath sheet (100mmx100mmx2mm) in 10% H2SO4, 10% NaOH, 3.5% NaCl solution, soak at 23℃ for 168h, rinse with water, absorb with filter paper, test the mass change rate and tensile strength retention rate; Salt spray test: spray the insulated sheath cable segment in neutral salt spray box (5% NaCl, pH=6.5-7.2) at 35℃, angle 45°, cycle 720h, count the maximum crack depth; Thermal cycle delamination: cycle the cable sample through -40℃ (2h)→85℃ (2h) for 20 times, observe the cross section; The test results are shown in Table 1 below: Table 1
[0036] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A corrosion-resistant power cable, characterized in that: From the inside to the outside, a conductor layer, an insulating layer and a sheath layer are sequentially arranged. The sheath layer comprises the following raw materials in parts by weight: 50-60 parts of polyvinyl chloride, 30-40 parts of hydrogenated nitrile rubber, 12-15 parts of BNT-Re@PFOTES filler, 6-8 parts of dioctyl terephthalate, 2-3 parts of vulcanizing agent DCP, 1.3-1.7 parts of octyltin mercaptide, 1-2 parts of antioxidant, 0.5-1 part of ultraviolet absorber, and 0.5-0.9 part of calcium stearate. Among them, the BNT-Re@PFOTES filler is obtained by treating rare earth-modified boron nitride@polydopamine with perfluorooctyltriethoxysilane.
2. A corrosion-resistant power cable according to claim 1, characterized in that: The preparation method of the boron nitride@polydopamine comprises: ultrasonically dispersing dopamine hydrochloride and tris(hydroxymethyl)aminomethane) in a mixture of ethanol, methanol and water, adding boron nitride nanotubes, and reacting at 65-75° C. for 9-11 hours to form boron nitride@polydopamine.
3. A corrosion-resistant power cable according to claim 2, characterized in that: The dosage ratio of dopamine hydrochloride, tris(hydroxymethyl)aminomethane, ethanol, methanol, water and boron nitride nanotubes is 1.4-1.6 g: 0.2-0.4 g: 45-55 mL: 45-55 mL: 90-110 mL: 0.25-0.35 g.
4. The corrosion-resistant power cable according to claim 1, characterized in that: The rare earth modification step includes: dispersing cerium nitrate and lanthanum nitrate in water, adding boron nitride@polydopamine, adjusting the pH to 5.5, oscillating and adsorbing for 10-14 hours, and then calcining at a temperature of 350-450° C. for 100-140 minutes to obtain BNT-Re.
5. The corrosion-resistant power cable according to claim 1, characterized in that: The usage ratio of the boron nitride@polydopamine, cerium nitrate, lanthanum nitrate and water is 1g:0.05-0.3g:0.05-0.3g:50-100mL.
6. The corrosion-resistant power cable according to claim 5, characterized in that: The perfluorooctyltriethoxysilane treatment steps include: dispersing perfluorooctyltriethoxysilane in ethanol and water, then adding rare earth modified boron nitride@polydopamine, stirring and reacting at 40-60° C. and 200-300 rpm under nitrogen protection for 10-12 hours, centrifuging, washing, and drying to obtain the product.
7. The corrosion-resistant power cable according to claim 1, characterized in that: The usage ratio of the perfluorooctyltriethoxysilane, ethanol and rare earth modified boron nitride@polydopamine is 1g:50-100mL:10-20g.
8. The corrosion-resistant power cable according to claim 1, characterized in that: The antioxidant includes antioxidant 1010 and antioxidant 168 in a weight ratio of 1:2-3; the ultraviolet absorber is at least one of benzotriazole UV-326, 327, and 328.
9. A method for preparing a corrosion-resistant power cable according to any one of claims 1 to 8, characterized in that the steps include: The BNT-Re@F filler is dried at a temperature of 75-85°C for 4-5 hours, polyvinyl chloride, octyltin mercaptan, calcium stearate and 1 / 3 weight part of dioctyl terephthalate are added to a high-speed mixer and mixed at 75-85°C for 5-7 minutes to form a base material, the base material is mixed with other remaining materials and kneaded to obtain a banburying material, the banburying material is added to a single-screw extruder for extrusion and granulation to obtain a sheathing material, the conductor layer is preheated to 110±5°C, the sheathing material and the insulating layer raw materials are extruded and coated on the conductive layer using a multi-layer co-extrusion device, and the corrosion-resistant power cable is wound up to obtain the corrosion-resistant power cable.
10. The method for preparing a corrosion-resistant power cable according to claim 9, characterized in that: The mixing step includes: adding hydrogenated nitrile rubber and remaining dioctyl terephthalate into an internal mixer in sequence, and plasticizing at 45-55° C. for 2-3 minutes; adding a base material, an antioxidant, and an ultraviolet absorber, heating to 150-160° C. and mixing for 2-4 minutes, adding BNT-Re@F filler in three batches, with an interval of 1 minute between each batch, and finally adding a vulcanizing agent DCP and mixing at 155-160° C. for 8-10 minutes.