High-toughness corrosion-resistant power cable

Abstract

The invention relates to the technical field of power cables, and provides a high-toughness corrosion-resistant power cable which comprises a conductor, and an insulating layer, an armor layer and a sheath layer are sequentially arranged on the outer side of the conductor. The sheath layer comprises the following raw materials in parts by weight: 35-45 parts of polyethylene, 35-45 parts of methyl vinyl silicone rubber, 35-48 parts of nitrile rubber, 6-8 parts of a plasticizer, 20-30 parts of filler, 1-2 parts of an antioxidant, 1-2 parts of a vulcanizing agent and 10-13 parts of a functional aid; the functional additive is prepared from the following raw materials: zinc oxide, cinnamic acid and cyclohexenecarboxylic acid. According to the technical scheme, the problem of poor toughness of the sheath layer of the corrosion-resistant power cable in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and in particular to a high-toughness, corrosion-resistant power cable. Background Art

[0002] As the core carrier of energy transmission, the performance of corrosion-resistant power cables directly affects the safe and stable operation of the power grid. With the development of new energy, the upgrading of urban infrastructure, and the intelligent development of industrial equipment, the service environment of cables is becoming increasingly complex. Under conditions such as the high-frequency vibration of rail transit, the tidal stress of marine engineering, and the low-temperature bending in polar scenes, cable sheath materials must withstand mechanical loads such as continuous dynamic stretching and repeated bending, placing stringent requirements on the toughness of corrosion-resistant power cable sheaths. However, the molecular structure characteristics and preparation process bottlenecks of traditional corrosion-resistant power cable sheath materials make it difficult for their elongation at break to meet the requirements of long-term reliable service in complex stress environments.

[0003] Conventional corrosion-resistant power cable sheathing materials, represented by polyethylene and polyvinyl chloride, have an inherent contradiction between the flexibility of their molecular chains and their cross-linked structures: polyethylene relies on the physical entanglement of molecular chains to achieve mechanical properties, and the mobility of chain segments is limited at low temperatures, making it prone to brittle cracking; polyvinyl chloride uses plasticizers to enhance its flexibility, but plasticizer migration over long-term use can cause the material to harden and gradually lose its flexibility. Although rubber-based materials have good initial flexibility, the unevenness of the cross-linked network can easily lead to stress concentration, resulting in fatigue fracture under high-frequency loads. It is difficult to balance the molecular chain mobility and structural stability of these materials, resulting in a significant decrease in elongation at break in extreme environments or long-term service, making them unable to adapt to dynamic deformation requirements.

[0004] In practice, insufficient elongation at break has become a major cause of sheath failure in corrosion-resistant power cables. For example, frequent bending of cables can lead to sheath cracking at stress concentration points due to insufficient flexibility. Sheath material hardening in low-temperature environments can lead to a sudden drop in tensile strength and the risk of brittle fracture. Fatigue accumulation under long-term dynamic loads can prematurely degrade the cable's mechanical properties, increasing operational costs and safety risks.

[0005] In summary, in the face of the urgent demand for high performance cables in various fields, it is of vital importance to develop a high-toughness, corrosion-resistant power cable that can improve the elongation at break of the sheath layer. Summary of the Invention

[0006] The present invention provides a high-toughness corrosion-resistant power cable, which solves the problem of poor toughness of the sheath layer of the corrosion-resistant power cable in the related art.

[0007] The technical solutions of the present invention are as follows: The present invention provides a high-toughness, corrosion-resistant power cable, comprising a conductor, wherein an insulating layer, an armor layer, and a sheath layer are sequentially provided on the outer side of the conductor, wherein the sheath layer comprises the following component raw materials in parts by weight: 35-45 parts of polyethylene, 35-45 parts of methyl vinyl silicone rubber, 35-48 parts of nitrile rubber, 6-8 parts of plasticizer, 20-30 parts of filler, 1-2 parts of antioxidant, 1-2 parts of vulcanizer, and 10-13 parts of functional additive; The raw materials of the functional auxiliary agent include zinc oxide, cinnamic acid and cyclohexenecarboxylic acid.

[0008] As a further technical solution, the mass ratio of the zinc oxide, cinnamic acid and cyclohexenecarboxylic acid is 1:1.8:1.3~1.7.

[0009] In the present invention, the mass ratio of zinc oxide, cinnamic acid and cyclohexenecarboxylic acid can be 1:1.8:1.3, 1:1.8:1.32, 1:1.8:1.34, 1:1.8:1.36, 1:1.8:1.38, 1:1.8:1.4, 1:1.8:1.42, 1:1.8:1.44, 1:1.8:1.46, 1:1.8:1.48 , 1:1.8:1.5, 1:1.8:1.52, 1:1.8:1.54, 1:1.8:1.56, 1:1.8:1.58, 1:1.8:1.6, 1:1.8:1.62, 1:1.8:1.64, 1:1.8:1.66, 1:1.8:1.68, 1:1.8:1.7, preferably 1:1.8:1.5.

[0010] In the present invention, zinc oxide is neutralized with cinnamic acid and cyclohexenecarboxylic acid during the preparation process of the cable sheath, and zinc salts of the two acids are generated in situ. These zinc salts interact with a system consisting of polyethylene, methyl vinyl silicone rubber, and nitrile rubber, thereby increasing the elongation at break of the corrosion-resistant power cable sheath layer and improving the toughness of the corrosion-resistant power cable.

[0011] As a further technical solution, the filler is a clay mineral; The clay minerals include one or more of montmorillonite, talc, and kaolin.

[0012] In the present invention, the filler may be any one or more conventional fillers, and may be one or more of calcium carbonate, carbon black, silicon dioxide, and clay minerals, preferably clay minerals, which include one or more of montmorillonite, talc, and kaolin.

[0013] In the present invention, the filler is preferably one or more clay minerals selected from montmorillonite, talc, and kaolin. Montmorillonite is a layered silicate mineral whose special crystal structure gives it a large specific surface area and cation exchange capacity. Talc is mainly composed of hydrated magnesium silicate, and its flaky structure can play a role in reinforcing the skeleton in the polymer, thereby improving the strength and hardness of the material by sharing stress. Kaolin is a clay mineral. When compounded with a polymer, the kaolin flakes can be peeled off or intercalated in the polymer matrix, enhancing the interaction between polymer molecular chains, thereby ensuring the mechanical properties and barrier properties of the corrosion-resistant power cable sheath.

[0014] As a further technical solution, the filler is an intercalated composite clay mineral; The raw materials of the intercalated composite clay mineral include clay mineral and N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine.

[0015] In the present invention, compared with conventional amide intercalants such as urea, N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine has stronger electron donating ability, stronger interaction with clay minerals, and more stable intercalation structure. When the filler is an intercalation composite clay mineral prepared from clay minerals and N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine, the layered crystal structure of the clay mineral gives it a certain chemical stability. The N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine molecule contains proton donors such as -NH that can form hydrogen bonds. The groups can form hydrogen bonds with the oxygen atoms of the silicon oxide surface of clay minerals. Therefore, the N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine molecules can be inserted into the interlayer of clay minerals. On the one hand, it expands the interlayer distance of clay minerals, improves the interaction between the filler and the matrix material of the cable sheath layer, and makes the other raw materials of the cable sheath layer better combined with the filler. On the other hand, a protective organic layer is formed on the surface and between the layers of the clay minerals. This organic layer can prevent corrosive substances from penetrating into the interior of the cable sheath, thereby significantly improving the corrosion resistance of the cable sheath.

[0016] As a further technical solution, the preparation method of the intercalated composite clay mineral comprises the following steps: A1. Adding clay mineral to ethanol to obtain a suspension; A2. Add N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine to ethanol and stir to obtain a solution; A3. Adding the dissolved solution to the suspension, stirring, concentrating, and drying to obtain the intercalated composite clay mineral.

[0017] In the present invention, the preparation method of the intercalated composite clay mineral is based on specific physical and chemical principles. In step A1, the clay mineral is added to ethanol to form a suspension. Ethanol, as a polar organic solvent, can effectively disperse clay mineral particles. Its surface tension and wettability are used to uniformly suspend the clay mineral particles therein to prevent agglomeration. In step A2, N, N'-bis [3- (trimethoxysilyl) propyl] ethylenediamine is added to ethanol and stirred to form a dissolving solution. Ethanol has good solubility for N, N'-bis [3- (trimethoxysilyl) propyl] ethylenediamine. Stirring accelerates the dissolution process and uniformly disperses the molecules in the solvent. In step A3, the dissolving solution is added to the clay mineral suspension. Stirring promotes N, N'-bis [3- (trimethoxysilyl) propyl] ethylenediamine molecules to diffuse to the surface and interlayer of the clay mineral particles and undergo intercalation. Concentration removes some ethanol, increases the system concentration, and is conducive to the stability of the intercalation structure. Drying completely removes ethanol and fixes the intercalation composite structure.

[0018] As a further technical solution, in the raw material of the intercalated composite clay mineral, the mass ratio of the clay mineral to N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine is 10:0.5~1.

[0019] In the present invention, the mass ratio of the clay mineral to N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine can be 10:0.5, 10:0.52, 10:0.54, 10:0.56, 10:0.58, 10:0.6, 10:0.62, 10:0.64, 10:0.66, 10:0.68, 10:0.7, 10:0.72, 10:0.74, 10:0.76, 10:0.78, 10:0.8, 10:0.82, 10:0.84, 10:0.86, 10:0.88, 10:0.9, 10:0.92, 10:0.94, 10:0.96, 10:0.98, or 10:1.

[0020] In the present invention, in the process of preparing an intercalated composite clay mineral for use in a power cable sheath, the mass ratio of the clay mineral to N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine is set to 10:0.5-1. When the two are mixed in a specific ratio, an appropriate amount of N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine can form a stable and effective intercalation composite with the clay mineral. If the ratio is too low, N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine cannot fully fill the interlayers of the clay mineral, making it difficult to form a continuous and effective reinforcement structure. If the ratio is too high, it may lead to excessive accumulation on the surface of the clay mineral, affecting the intercalation composite effect.

[0021] As a further technical solution, in step A1, the mass volume ratio of the clay mineral to ethanol is 1 g:5-6 mL.

[0022] In the present invention, in step A1 of preparing the intercalated composite clay mineral, the clay mineral and ethanol are mixed in a mass-to-volume ratio of 1 g:5-6 mL. Ethanol is used as a dispersion medium, and its amount needs to be adapted to the mass of the clay mineral to ensure that the clay mineral particles can be evenly dispersed to form a stable suspension. When the amount of ethanol is within this range, its physical properties such as surface tension and viscosity can fully wet the clay mineral particles, and the interaction force between the particles is effectively regulated, thereby preventing particle agglomeration and achieving a good dispersion effect. At the same time, the appropriate ratio facilitates the subsequent diffusion and intercalation process of N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine molecules in the suspension.

[0023] As a further technical solution, in step A2, the mass volume ratio of the N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine to ethanol is 1 g:3-4 mL.

[0024] In the present invention, in step A2, N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine and ethanol are mixed at a mass volume ratio of 1 g:3-4 mL. Ethanol, as a good organic solvent, has a certain solubility for N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine. Within this ratio range, ethanol molecules can fully interact with N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine molecules, so that N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine is uniformly dispersed in ethanol to form a stable solution, ensuring that the molecular distance of N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine in the solution is moderate, which is beneficial for its diffusion into the clay mineral suspension in the subsequent step, and can also ensure the activity of the molecule and promote intercalation and recombination with the clay mineral.

[0025] As a further technical solution, in step A3, the stirring is performed at a speed of 500-600 rpm, a temperature of 40-50° C., and a time of 2-3 h.

[0026] In the present invention, in step A3, the stirring speed is set to 500-600 rpm, the temperature is controlled at 40-50 ° C, and the time is maintained for 2-3 hours. Within this range of stirring speed, sufficient shear force can be provided to promote the full mixing of the N, N'-bis [3- (trimethoxysilyl) propyl] ethylenediamine solution and the clay mineral suspension, thereby accelerating the diffusion of N, N'-bis [3- (trimethoxysilyl) propyl] ethylenediamine molecules to the surface and interlayer of the clay mineral particles. The temperature range of 40-50 ° C can provide suitable activation energy for the intercalation reaction between N, N'-bis [3- (trimethoxysilyl) propyl] ethylenediamine and the clay mineral, thereby accelerating the rate, without causing excessive volatilization of ethanol or inducing other side reactions due to excessive temperature, thereby affecting the formation of the intercalation structure. The time is maintained for 2-3 hours, thereby ensuring that the intercalation between N, N'-bis [3- (trimethoxysilyl) propyl] ethylenediamine and the clay mineral can be fully carried out to form a stable intercalation composite structure. If the time is too short, the reaction is incomplete and the intercalation effect is poor; if the time is too long, it will lead to energy waste and other adverse effects.

[0027] As a further technical solution, the plasticizer includes one or more of dioctyl phthalate, diisononyl phthalate, and dioctyl terephthalate.

[0028] In the present invention, plasticizers such as dioctyl phthalate, diisononyl phthalate, and dioctyl terephthalate belong to the ester class of plasticizers, whose working principle is based on the principle of like dissolves like and intermolecular forces. These plasticizer molecules can not only insert between polymer molecular chains, weakening the van der Waals forces between the molecular chains and increasing the mobility of the molecular chains, thereby lowering the glass transition temperature of the polymer, making the material more flexible and easier to process, but also effectively reduce the melt viscosity of the polymer and improve its fluidity, making the cable sheath layer easier to process and shape during extrusion or injection molding.

[0029] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1035.

[0030] In the present invention, antioxidant 1010, antioxidant 168, antioxidant 1035, etc. are used as antioxidants. Their main working principle is to capture free radicals generated by polymer materials during the oxidation process, or decompose hydroperoxides generated during the oxidation process, thereby interrupting the oxidation chain reaction and delaying the aging process of the material. During the processing process, these antioxidants have good thermal stability and can remain stable at the processing temperature of the cable sheath material without decomposition or volatilization, and effectively play an antioxidant role. In practical applications, the use of antioxidants greatly extends the service life of the cable sheath layer in the natural environment and reduces the degradation of material properties caused by oxidation, such as color change, hardening and brittleness, etc.

[0031] As a further technical solution, the vulcanizing agent includes one or both of dibenzoyl peroxide and tert-butyl perbenzoate.

[0032] In the present invention, the vulcanizing agent, such as dibenzoyl peroxide and tert-butyl perbenzoate, is an organic peroxide vulcanizing agent. Its mechanism of action is that under heating or specific conditions, the organic peroxide molecules decompose to generate free radicals. These free radicals initiate a cross-linking reaction between matrix molecular chains, transforming the linear matrix molecular chains into a three-dimensional network structure, thereby improving the strength, elasticity, and wear resistance of the jacket layer. During processing, these vulcanizing agents can be evenly dispersed during the rubber mixing process and rapidly decompose at a suitable vulcanization temperature to generate free radicals, initiating a cross-linking reaction, resulting in a fast vulcanization speed.

[0033] The working principle and beneficial effects of the present invention are: In the present invention, polyethylene molecular chains interact with each other by van der Waals forces, and the regular arrangement of the molecular chains gives it a certain degree of crystallinity, so that it has good physical and mechanical properties and chemical stability. The main chain of methyl vinyl silicone rubber is composed of silicon oxygen bonds, and the side chains contain methyl and vinyl groups. The silicon oxygen bond energy is relatively high, which makes the silicone rubber have outstanding heat resistance, cold resistance and weather resistance. The polarity of the nitrile group in nitrile rubber makes nitrile rubber have excellent resistance to non-polar or weakly polar oils and solvents. The plasticizer makes the raw materials easier to process and shape. The filler improves the mechanical properties of the sheath layer and reduces the cost. The antioxidant prevents the material from deteriorating due to oxidation. The vulcanizer triggers a cross-linking reaction to improve the strength of the sheath layer. The functional additives include The invention comprises zinc oxide, cinnamic acid and cyclohexenecarboxylic acid. Zinc oxide, cinnamic acid and cyclohexenecarboxylic acid generate zinc cinnamate and zinc cyclohexenecarboxylic acid in situ in the system. Cinnamic acid and cyclohexenecarboxylic acid are unsaturated carboxylic acids. The zinc salts generated by the reaction of the two with zinc oxide have stronger polarity than conventional zinc stearate, and can form more stable interactions with polymer chains, thereby increasing the mobility of the polymer chains and improving the toughness of the cable sheath layer. During the vulcanization process of the cable sheath layer, zinc cinnamate and zinc cyclohexenecarboxylic acid can react with the polymer chains in the polymer matrix under the action of a peroxide crosslinking agent to form "ionic covalent bonding", which synergistically improves the toughness of the corrosion-resistant power cable sheath layer. DETAILED DESCRIPTION

[0034] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0035] In the following examples and comparative examples, the conductor material is copper; The insulation material is cross-linked polyethylene; The armor layer is nickel-plated copper wire with a braiding density of 85%; Polyethylene: Model 2102TN00; Methyl vinyl silicone rubber: Model 110-2; Nitrile rubber: Model is Zhenjiang Nandi 1051; Montmorillonite: particle size is 325 mesh; Talc: particle size is 325 mesh; Kaolin: particle size is 325 mesh.

[0036] Example 1 A high-toughness, corrosion-resistant power cable comprises a conductor, wherein an insulating layer, an armor layer, and a sheath layer are sequentially arranged on the outer side of the conductor, wherein the sheath layer comprises the following components in parts by weight: 45 parts of polyethylene, 45 parts of methyl vinyl silicone rubber, 48 parts of nitrile rubber, 4 parts of dioctyl phthalate, 4 parts of diisononyl phthalate, 10 parts of montmorillonite, 10 parts of talc, 10 parts of kaolin, 2 parts of antioxidant 1010, 2 parts of dibenzoyl peroxide, and 13 parts of a functional additive; The functional additives include zinc oxide, cinnamic acid and cyclohexenecarboxylic acid in a mass ratio of 1:1.8:2; A method for preparing a high-toughness, corrosion-resistant power cable comprises the following steps: S1, mixing polyethylene, methyl vinyl silicone rubber, nitrile rubber, and functional additives, and heat treating at 140° C. for 14 min to obtain a rubber mixture; S2. The rubber mixture is mixed with dioctyl phthalate, diisononyl phthalate, montmorillonite, talc, kaolin, antioxidant 1010, and dibenzoyl peroxide for 35 minutes, extruded onto the surface of the armor layer, and vulcanized to obtain a high-toughness, corrosion-resistant power cable.

[0037] Example 2 A high-toughness, corrosion-resistant power cable comprises a conductor, wherein an insulating layer, an armor layer, and a sheath layer are sequentially provided on the outer side of the conductor, wherein the sheath layer comprises the following component raw materials in parts by weight: 35 parts of polyethylene, 35 parts of methyl vinyl silicone rubber, 35 parts of nitrile rubber, 2 parts of dioctyl phthalate, 2 parts of diisononyl phthalate, 2 parts of dioctyl terephthalate, 20 parts of talc, 0.5 parts of antioxidant 168, 0.5 parts of antioxidant 1035, 0.5 parts of dibenzoyl peroxide, 0.5 parts of tert-butyl perbenzoate, and 10 parts of a functional additive; The functional additives include zinc oxide, cinnamic acid and cyclohexenecarboxylic acid in a mass ratio of 1:1.8:1; A method for preparing a high-toughness, corrosion-resistant power cable comprises the following steps: S1, mixing polyethylene, methyl vinyl silicone rubber, nitrile rubber, and functional additives, and heat treating at 136° C. for 10 min to obtain a rubber mixture; S2. The rubber mixture is mixed with dioctyl phthalate, diisononyl phthalate, dioctyl terephthalate, talc, antioxidant 168, antioxidant 1035, dibenzoyl peroxide, and tert-butyl perbenzoate for 25 minutes, extruded onto the surface of the armor layer, and vulcanized to obtain a high-toughness, corrosion-resistant power cable.

[0038] Example 3 A high-toughness, corrosion-resistant power cable comprises a conductor, an insulating layer, an armor layer, and a sheath layer sequentially disposed on the outer side of the conductor, wherein the sheath layer comprises the following components in parts by weight: 40 parts of polyethylene, 40 parts of methyl vinyl silicone rubber, 43 parts of nitrile rubber, 7 parts of dioctyl terephthalate, 25 parts of kaolin, 1.5 parts of antioxidant 1035, 1.5 parts of tert-butyl perbenzoate, and 12 parts of a functional additive; The functional additives include zinc oxide, cinnamic acid and cyclohexenecarboxylic acid in a mass ratio of 1:1.8:1.9; A method for preparing a high-toughness, corrosion-resistant power cable comprises the following steps: S1, mixing polyethylene, methyl vinyl silicone rubber, nitrile rubber, and functional additives, and heat treating at 138° C. for 12 min to obtain a rubber mixture; S2. The rubber mixture is mixed with dioctyl terephthalate, kaolin, antioxidant 1035, and tert-butyl perbenzoate for 30 minutes, extruded onto the surface of the armor layer, and vulcanized to obtain a high-toughness, corrosion-resistant power cable.

[0039] Example 4 The only difference between this embodiment and embodiment 3 is that the mass ratio of zinc oxide, cinnamic acid and cyclohexenecarboxylic acid in this embodiment is 1:1.8:1.1.

[0040] Example 5 The only difference between this embodiment and embodiment 3 is that the mass ratio of zinc oxide, cinnamic acid and cyclohexenecarboxylic acid in this embodiment is 1:1.8:1.3.

[0041] Example 6 The only difference between this embodiment and embodiment 3 is that the mass ratio of zinc oxide, cinnamic acid and cyclohexenecarboxylic acid in this embodiment is 1:1.8:1.5.

[0042] Example 7 The only difference between this embodiment and embodiment 3 is that the mass ratio of zinc oxide, cinnamic acid and cyclohexenecarboxylic acid in this embodiment is 1:1.8:1.7.

[0043] Example 8 The only difference between this embodiment and embodiment 6 is that the kaolin in this embodiment is replaced by intercalated composite kaolin of equal mass; The preparation method of intercalated composite kaolin comprises the following steps: A1. Add kaolin to ethanol (mass volume ratio of kaolin to ethanol is 1 g:6 mL) to obtain a kaolin suspension. A2. Add N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine to ethanol (the mass volume ratio of N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine to ethanol is 1 g:4 mL, and the mass ratio of kaolin to N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine is 10:1), and stir to obtain a solution; A3. Add the dissolved solution to the kaolin suspension, stir at 50°C and 600 rpm for 2 h, concentrate, and dry to obtain intercalated composite kaolin.

[0044] Example 9 The only difference between this embodiment and embodiment 6 is that the kaolin in this embodiment is replaced by intercalated composite kaolin of equal mass; The preparation method of intercalated composite kaolin comprises the following steps: A1. Add kaolin to ethanol (mass volume ratio of kaolin to ethanol is 1 g:5 mL) to obtain a kaolin suspension. A2. Add N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine to ethanol (the mass volume ratio of N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine to ethanol is 1 g:3 mL, and the mass ratio of kaolin to N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine is 10:0.5), and stir to obtain a solution; A3. Add the dissolved solution to the kaolin suspension, stir at 40°C and 500 rpm for 3 h, concentrate, and dry to obtain intercalated composite kaolin.

[0045] Comparative Example 1 The only difference between this comparative example and Example 3 is that the functional auxiliary agent in this comparative example includes zinc oxide and cinnamic acid in a mass ratio of 1:3.7.

[0046] Comparative Example 2 The only difference between this comparative example and Example 3 is that the functional auxiliary agent in this comparative example includes zinc oxide and cyclohexenecarboxylic acid in a mass ratio of 1:3.7.

[0047] Comparative Example 3 The only difference between this comparative example and Example 3 is that this comparative example does not contain a functional auxiliary agent.

[0048] Experimental Example 1 The sheath layers of the high-toughness, corrosion-resistant power cables produced in Examples 1-7 and Comparative Examples 1-3 were tested for elongation at break according to the method specified in GB / T 528-2009, "Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties." The test specimens were dumbbell-shaped, Type 1, and the tensile speed was 500 mm / min. The test results are shown in Table 1.

[0049] Table 1 Elongation at break test results

[0050] As can be seen from Table 1, the elongation at break of the sheath layer of the high-toughness corrosion-resistant power cables prepared in Examples 1 to 7 of the present invention reached more than 388%. Therefore, zinc oxide, cinnamic acid and cyclohexenecarboxylic acid are used as functional additives in the present invention to improve the toughness of the sheath layer of the corrosion-resistant power cable.

[0051] Experimental Example 2 Narrow strips of the high-toughness, corrosion-resistant power cables produced in Examples 6 and 8-9 were cut to produce specimens. These specimens were then immersed in a 1 mol / L hydrochloric acid solution for 7 days. The corrosion resistance of the specimens was tested using the weight loss method: weight loss rate = (sample weight before immersion - sample weight after immersion) / specimen weight before immersion × 100%. The test results are shown in Table 2.

[0052] Table 2 Weight loss test results

[0053] As can be seen from Table 2, the weight loss rates in Examples 8 to 9 of the present invention reached below 0.6%. Therefore, the use of N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine intercalated composite clay minerals in the present invention improves the corrosion resistance of the power cable sheath layer.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-toughness, corrosion-resistant power cable, characterized in that: The invention comprises a conductor, wherein an insulating layer, an armor layer and a sheath layer are sequentially arranged on the outer side of the conductor, wherein the sheath layer comprises the following components in parts by weight: 35-45 parts of polyethylene, 35-45 parts of methyl vinyl silicone rubber, 35-48 parts of nitrile rubber, 6-8 parts of plasticizer, 20-30 parts of filler, 1-2 parts of antioxidant, 1-2 parts of vulcanizer, and 10-13 parts of functional additive; The raw materials of the functional auxiliary agent include zinc oxide, cinnamic acid and cyclohexenecarboxylic acid.

2. A high-toughness, corrosion-resistant power cable according to claim 1, characterized in that: The mass ratio of the zinc oxide, cinnamic acid and cyclohexenecarboxylic acid is 1:1.8:1.3-1.

7.

3. The high-toughness, corrosion-resistant power cable according to claim 1, characterized in that: The filler is a clay mineral; The clay minerals include one or more of montmorillonite, talc, and kaolin.

4. The high-toughness, corrosion-resistant power cable according to claim 3, characterized in that: The filler is an intercalated composite clay mineral; The raw materials of the intercalated composite clay mineral include clay mineral and N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine.

5. The high-toughness, corrosion-resistant power cable according to claim 4, characterized in that: The preparation method of the intercalated composite clay mineral comprises the following steps: A1. Adding clay mineral to ethanol to obtain a suspension; A2. Add N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine to ethanol and stir to obtain a solution; A3. Adding the dissolved solution to the suspension, stirring, concentrating, and drying to obtain the intercalated composite clay mineral.

6. The high-toughness, corrosion-resistant power cable according to claim 5, characterized in that: In the raw material of the intercalated composite clay mineral, the mass ratio of the clay mineral to N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine is 10:0.5-1.

7. The high-toughness, corrosion-resistant power cable according to claim 5, characterized in that: In step A1, the mass volume ratio of the clay mineral to ethanol is 1 g:5-6 mL.

8. The high-toughness, corrosion-resistant power cable according to claim 5, characterized in that: In step A2, the mass volume ratio of the N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine to ethanol is 1 g:3-4 mL.

9. The high-toughness, corrosion-resistant power cable according to claim 5, characterized in that: In step A3, the stirring is carried out at a speed of 500-600 rpm, a temperature of 40-50° C., and a time of 2-3 h.

10. The high-toughness, corrosion-resistant power cable according to claim 1, characterized in that: The plasticizer includes one or more of dioctyl phthalate, diisononyl phthalate, and dioctyl terephthalate; The antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1035; The vulcanizing agent includes one or both of dibenzoyl peroxide and tert-butyl perbenzoate.

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