Crosslinked polyethylene insulated corrosion resistant power cable

Abstract

The application relates to the technical field of power cables, and discloses a cross-linked polyethylene insulation corrosion-resistant power cable, which comprises a conductor, an insulation layer and a sheath layer arranged in sequence from inside to outside, and the sheath layer comprises the following components by weight: 60-80 parts of polyvinyl chloride, 8-12 parts of polyacrylonitrile-butadiene-styrene, 1-3 parts of a compatilizer, 20-30 parts of a filler and 10-15 parts of an additive; the flow shrinkage rate of the polyvinyl chloride is 0.4%-0.5%, the vertical shrinkage rate of the polyvinyl chloride is 0.6%-1.2%, the flow shrinkage rate of the polyacrylonitrile-butadiene-styrene is 0.4%-0.5%, and the vertical shrinkage rate of the polyacrylonitrile-butadiene-styrene is 0.5%-0.8%. Through the technical scheme, the problem of insufficient corrosion resistance of the power cable in the related art is solved.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, and more specifically, to a cross-linked polyethylene insulated corrosion-resistant power cable. Background Technology

[0002] Power cables are essential infrastructure for transmitting and distributing electrical energy, widely used in urban power grids, industrial and mining enterprises, rail transportation, and underground installations. Cross-linked polyethylene insulated power cables have become the mainstream product in power transmission and distribution systems due to their excellent insulation performance, good heat resistance, and high current carrying capacity.

[0003] However, in practical applications, the corrosion resistance of cross-linked polyethylene insulated power cables remains insufficient, making them unsuitable for special corrosive environments such as chemical industrial parks, coastal high-salt-spray areas, underground humid environments, and offshore platforms. Insufficient corrosion resistance in power cables can lead to a series of serious hazards, directly threatening the safe operation of the power grid and the safety of people and property. Mild corrosion can cause a decline in the cable's mechanical properties, accelerated insulation aging, decreased conductivity, increased energy consumption, shortened cable lifespan, and increased maintenance costs. Severe corrosion can lead to sheath perforation and insulation breakdown, causing short circuits, leakage, and even large-scale power outages.

[0004] Therefore, it is very necessary to develop a cross-linked polyethylene insulated corrosion-resistant power cable. Summary of the Invention

[0005] This invention proposes a cross-linked polyethylene insulated corrosion-resistant power cable, which solves the problem of insufficient corrosion resistance in power cables in related technologies.

[0006] The technical solution of this invention is as follows: This invention proposes a cross-linked polyethylene insulated corrosion-resistant power cable, comprising a conductor, an insulation layer, and a sheath layer arranged sequentially from the inside out. The sheath layer comprises the following raw materials in parts by weight: 60-80 parts of polyvinyl chloride, 8-12 parts of polyacrylonitrile-butadiene-styrene, 1-3 parts of compatibilizer, 20-30 parts of filler, and 10-15 parts of additives; the flow shrinkage rate of the polyvinyl chloride is 0.4%-0.5%, the vertical shrinkage rate of the polyvinyl chloride is 0.6%-1.2%, the flow shrinkage rate of the polyacrylonitrile-butadiene-styrene is 0.4%-0.5%, and the vertical shrinkage rate of the polyacrylonitrile-butadiene-styrene is 0.5%-0.8%.

[0007] As a further technical solution, the conductor is made of copper.

[0008] As a further technical solution, the insulation layer is a cross-linked polyethylene insulation layer.

[0009] As a further technical solution, the compatibilizer includes one or more of methyl methacrylate-butadiene-styrene copolymer, ethylene-vinyl acetate copolymer, and maleic anhydride-grafted polypropylene, preferably methyl methacrylate-butadiene-styrene copolymer.

[0010] In this invention, a compatibilizer is added to the sheath layer of the cross-linked polyethylene insulated corrosion-resistant power cable, which can improve the compatibility between polyvinyl chloride and polyacrylonitrile. butadiene The interfacial compatibility between styrene phases reduces interfacial tension, minimizes phase separation and interfacial defects, resulting in a tighter bond and more uniform structure in the blended system, thereby improving the mechanical properties and structural stability of the sheath.

[0011] As a further technical solution, the filler includes one or more of calcium carbonate, talc, and carbon black, preferably talc.

[0012] As a further technical solution, the talc powder is a composite talc powder, which comprises the following components in parts by weight: 100 parts talc powder, 6-8 parts aminopropyl silane coupling agent, and 4-6 parts epoxypropoxysilane coupling agent. Preferably, the composite talc powder comprises the following components in parts by weight: 100 parts talc powder, 8 parts aminopropyl silane coupling agent, and 5 parts epoxypropoxysilane coupling agent.

[0013] As a further technical solution, the aminopropylsilane coupling agent includes one or more of 3-aminopropyltriethoxysilane, 3-aminopropylmethyldiethoxysilane, and (3-aminopropyl)trimethoxysilane, preferably 3-aminopropyltriethoxysilane.

[0014] As a further technical solution, the epoxypropoxysilane coupling agent includes one or two of 3-(2,3-epoxypropoxy)propyltriethoxysilane and γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0015] As a further technical solution, the preparation method of the composite talc powder includes the following steps: dispersing an aminopropylsilane coupling agent in a solvent, adding talc powder, stirring, then adding an epoxypropoxysilane coupling agent, mixing, and drying to obtain composite talc powder.

[0016] In the cross-linked polyethylene insulated corrosion-resistant power cable of the present invention, two different silane coupling agents are added sequentially during the preparation of composite talc powder. First, the surface of the talc powder is treated with an aminopropyl silane coupling agent to introduce amino groups onto the surface of the talc powder. Then, an epoxypropoxy silane coupling agent is added. This promotes the uniform dispersion of talc powder and enhances the interfacial bonding force between the talc powder and the matrix material, thereby effectively improving the strength of the power cable.

[0017] As a further technical solution, the solvent is composed of anhydrous ethanol and water in a mass ratio of 5:1.

[0018] As a further technical solution, the stirring time is 1 to 3 hours, preferably 2 hours, and the stirring speed is 300 to 600 r / min, preferably 400 r / min.

[0019] As a further technical solution, the mixing time is 2-4 hours, preferably 3 hours.

[0020] As a further technical solution, the mass ratio of the talc powder to the solvent is 1:3~6, preferably 1:4.

[0021] As a further technical solution, the additive is composed of a heat stabilizer, a lubricant, an antioxidant, and a plasticizer in a mass ratio of 4~5:4:0.8:3.

[0022] As a further technical solution, the heat stabilizer includes one or two of calcium-zinc composite heat stabilizers and butyltin heat stabilizers, preferably calcium-zinc composite heat stabilizers.

[0023] The present invention adds a heat stabilizer to the sheath layer of cross-linked polyethylene insulated corrosion-resistant power cable. The heat stabilizer can effectively inhibit the thermo-oxidative degradation and dehydrochlorination of polyvinyl chloride during high-temperature extrusion processing and long-term use, prevent material discoloration, embrittlement and cracking, and improve the processing stability and service life of the sheath.

[0024] As a further technical solution, the lubricant includes one or two of polyethylene wax and stearic acid, preferably stearic acid.

[0025] The present invention adds a lubricant to the sheath layer of the cross-linked polyethylene insulated corrosion-resistant power cable, which can reduce the internal and external frictional resistance of the material during processing, improve melt flowability and demolding performance, make the extrusion process more stable, reduce surface defects of the sheath, and improve the smoothness of the product appearance and processing efficiency.

[0026] As a further technical solution, the antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1~2.

[0027] The present invention adds an antioxidant to the sheath layer of cross-linked polyethylene insulated corrosion-resistant power cable. The antioxidant is composed of antioxidant 1010 and antioxidant 168. The two work synergistically to effectively capture free radicals in the system, decompose peroxides, inhibit the oxidative aging of materials during processing and use, and improve the long-term stability of the sheath.

[0028] As a further technical solution, the plasticizer includes one or more of dioctyl phthalate, dioctyl terephthalate, and trioctyl trimellitate, preferably dioctyl phthalate.

[0029] The present invention adds a plasticizer to the sheath layer of the cross-linked polyethylene insulated corrosion-resistant power cable. The plasticizer can insert between the polyvinyl chloride molecular chains, weaken the intermolecular forces, improve the flexibility of the material, improve the processing fluidity, and at the same time enhance the sheath's adaptability to external forces such as bending and extrusion.

[0030] The working principle and beneficial effects of this invention are as follows: This invention relates to a cross-linked polyethylene insulated corrosion-resistant power cable sheath layer, in which polyvinyl chloride (PVC) and polyacrylonitrile-butadiene-styrene (P&T) are added. By adjusting the flow shrinkage rate and vertical shrinkage rate of both, the corrosion resistance of the power cable is effectively improved. In this invention, the flow shrinkage rate ranges of PVC and P&T are kept consistent, effectively preventing the formation of micro-voids, interface separation, and penetrating micro-cracks along the length direction within the sheath due to asynchronous shrinkage, thus blocking the penetration channels of corrosive media such as acids, alkalis, and salt spray at the source. In the vertical direction, the vertical shrinkage rate of PVC is slightly greater than that of P&T. As the matrix phase, PVC undergoes relatively greater vertical shrinkage upon cooling, which can create a moderate radial tightening effect on the blend system, resulting in a tighter bond between the internal phase interfaces. The vertical shrinkage rate of P&T is within the range of 0.5% to 0.8%, effectively buffering the internal stress concentration caused by PVC shrinkage and preventing warping, deformation, and internal cracking due to excessive shrinkage differences. The reasonable combination of the vertical shrinkage rates of the two ensures that the internal stress of the system is small, the dimensions are stable and it is not easy to warp and crack, while making the overall structure of the sheath more compact, uniform and without weak interfaces. This effectively prevents the corrosive medium from penetrating along the thickness direction, and further improves the corrosion resistance and structural stability of the cable sheath. Detailed Implementation

[0031] 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.

[0032] In the following examples and comparative examples: Methyl methacrylate butadiene Styrene copolymer: Model number EM500; Talc powder: average particle size is 400 mesh; Calcium-zinc composite heat stabilizer: model number MC91660.

[0033] Example 1 The sheath layer comprises the following raw materials in parts by weight: 60 parts polyvinyl chloride, 8 parts polyacrylonitrile-butadiene-styrene, 1 part methyl methacrylate-butadiene-styrene copolymer, 20 parts talc, and 10 parts additives; the additives consist of a calcium-zinc composite heat stabilizer, stearic acid, antioxidants, and dioctyl phthalate in a mass ratio of 4:4:0.8:3, and the antioxidants consist of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1; The polyvinyl chloride has a flow shrinkage rate of 0.4% and a vertical shrinkage rate of 0.6%, and its model number is PVC 66311. The flow shrinkage rate of polyacrylonitrile-butadiene-styrene is 0.4%, the vertical shrinkage rate is 0.6%, and the model number is ABS138. A method for preparing a cross-linked polyethylene insulated corrosion-resistant power cable includes the following steps: S1. After extruding a cross-linked polyethylene insulation layer over a copper conductor, a semi-finished product is obtained; S2. Mix the raw materials of the sheath layer evenly and extrude them onto the outside of the semi-finished product to obtain a cross-linked polyethylene insulated corrosion-resistant power cable.

[0034] Example 2 The sheath layer comprises the following raw materials in parts by weight: 70 parts polyvinyl chloride, 10 parts polyacrylonitrile-butadiene-styrene, 2 parts methyl methacrylate-butadiene-styrene copolymer, 25 parts talc, and 12 parts additives; the additives consist of a calcium-zinc composite heat stabilizer, stearic acid, antioxidants, and dioctyl phthalate in a mass ratio of 4:4:0.8:3, and the antioxidants consist of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1; The polyvinyl chloride has a flow shrinkage rate of 0.4% and a vertical shrinkage rate of 0.6%, and its model number is PVC 66311. The flow shrinkage rate of polyacrylonitrile-butadiene-styrene is 0.4%, the vertical shrinkage rate is 0.7%, and the model number is ABS10072. A method for preparing a cross-linked polyethylene insulated corrosion-resistant power cable includes the following steps: S1. After extruding a cross-linked polyethylene insulation layer over a copper conductor, a semi-finished product is obtained; S2. Mix the raw materials of the sheath layer evenly and extrude them onto the outside of the semi-finished product to obtain a cross-linked polyethylene insulated corrosion-resistant power cable.

[0035] Example 3 The sheath layer comprises the following raw materials in parts by weight: 80 parts polyvinyl chloride, 12 parts polyacrylonitrile-butadiene-styrene, 3 parts methyl methacrylate-butadiene-styrene copolymer, 30 parts talc, and 15 parts additives; the additives consist of a calcium-zinc composite heat stabilizer, stearic acid, antioxidants, and dioctyl phthalate in a mass ratio of 4:4:0.8:3, and the antioxidants consist of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1; The polyvinyl chloride has a flow shrinkage rate of 0.5% and a vertical shrinkage rate of 1.2%, and its model number is PVC 85520. The flow shrinkage rate of polyacrylonitrile-butadiene-styrene is 0.5%, the vertical shrinkage rate is 0.8%, and the model number is ABSM301AS. A method for preparing a cross-linked polyethylene insulated corrosion-resistant power cable includes the following steps: S1. After extruding a cross-linked polyethylene insulation layer over a copper conductor, a semi-finished product is obtained; S2. Mix the raw materials of the sheath layer evenly and extrude them onto the outside of the semi-finished product to obtain a cross-linked polyethylene insulated corrosion-resistant power cable.

[0036] Example 4 The difference between Example 4 and Example 2 is that the talc powder is replaced with an equal amount of composite talc powder prepared by the following preparation method; The preparation method of composite talc powder includes the following steps: 12 parts of 3-aminopropyltriethoxysilane are dispersed in 400 parts of solvent, the solvent is composed of anhydrous ethanol and water in a mass ratio of 5:1, 100 parts of talc powder are added, stirred for 5 hours, and dried to obtain composite talc powder.

[0037] Example 5 The difference between Example 5 and Example 4 is that 3-aminopropyltriethoxysilane is replaced with an equal amount of 3-(2,3-epoxypropoxy)propyltriethoxysilane.

[0038] Example 6 The difference between Example 6 and Example 4 is that 12 parts of 3-aminopropyltriethoxysilane were replaced with 8 parts of 3-aminopropyltriethoxysilane and 5 parts of 3-(2,3-epoxypropoxy)propyltriethoxysilane.

[0039] Example 7 Compared with Example 4, the difference in Example 7 is that the preparation method of composite talc powder includes the following steps: 8 parts of 3-aminopropyltriethoxysilane are dispersed in 400 parts of solvent, the solvent being composed of anhydrous ethanol and water in a mass ratio of 5:1, 100 parts of talc powder are added, and after stirring for 2 hours, 4 parts of 3-(2,3-epoxypropoxy)propyltriethoxysilane are added, and after mixing for 3 hours, the mixture is dried to obtain composite talc powder.

[0040] Example 8 The difference between Example 7 and Example 8 is that 3-(2,3-epoxypropoxy)propyltriethoxysilane is replaced with an equal amount of γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0041] Example 9 The difference between Example 9 and Example 7 is that 3-(2,3-epoxypropoxy)propyltriethoxysilane is replaced with an equal amount of vinyltrimethoxysilane.

[0042] Example 10 Compared with Example 7, Example 10 differs in that the preparation method of the composite talc powder includes the following steps: 6 parts of 3-aminopropyltriethoxysilane are dispersed in 400 parts of solvent, the solvent being composed of anhydrous ethanol and water in a mass ratio of 5:1, 100 parts of talc powder are added, and after stirring for 2 hours, 6 parts of 3-(2,3-epoxypropoxy)propyltriethoxysilane are added, and after mixing for 3 hours, the mixture is dried to obtain the composite talc powder.

[0043] Comparative Example 1 Compared with Example 2, Comparative Example 1 differs in that polyvinyl chloride (with a flow shrinkage rate of 0.4% and a vertical shrinkage rate of 0.6%, model PVC 66311) is replaced with a fixed amount of polyvinyl chloride with a flow shrinkage rate of 1.3% and a vertical shrinkage rate of 1.7%, model PVC A90UB.

[0044] Comparative Example 2 Compared with Example 2, Comparative Example 2 differs in that polyvinyl chloride (with a flow shrinkage rate of 0.4% and a vertical shrinkage rate of 0.6%, model PVC 66311) is replaced with a fixed amount of polyvinyl chloride with a flow shrinkage rate of 0.2% and a vertical shrinkage rate of 0.5%, model PVC M3700.

[0045] Comparative Example 3 Compared with Example 2, Comparative Example 3 differs in that polyacrylonitrile-butadiene-styrene (with a flow shrinkage rate of 0.4% and a vertical shrinkage rate of 0.7%, model ABS 10072) is replaced with an equal amount of polyacrylonitrile-butadiene-styrene, with a flow shrinkage rate of 0.6% and a vertical shrinkage rate of 0.9%, model ABS P2K.

[0046] Comparative Example 4 Compared with Example 2, Comparative Example 4 differs in that polyacrylonitrile-butadiene-styrene (with a flow shrinkage rate of 0.4% and a vertical shrinkage rate of 0.7%, model ABS 10072) is replaced with an equal amount of polyacrylonitrile-butadiene-styrene, with a flow shrinkage rate of 0.2% and a vertical shrinkage rate of 0.3%, model ABS 150G22.

[0047] Experimental Example 1 The sheath layers of the cross-linked polyethylene insulated corrosion-resistant power cables prepared in Examples 1-3 and Comparative Examples 1-4 were immersed in a 30% hydrochloric acid solution for 72 hours. The tensile strength of the samples before and after immersion was tested according to the test method specified in GB / T 1040.2-2022. The test speed was 200 mm / min and the sample type was 1A.

[0048] The test results are shown in Table 1: Table 1 Performance test results of Examples 1-3 and Comparative Examples 1-4

[0049] As shown in Table 1, when the flow shrinkage rate of polyvinyl chloride in the sheath layer of cross-linked polyethylene insulated corrosion-resistant power cable is 0.4%~0.5% and the vertical shrinkage rate is 0.6%~1.2%, and when the flow shrinkage rate of polyacrylonitrile-butadiene-styrene is 0.4%~0.5% and the vertical shrinkage rate is 0.5%~0.8%, the corrosion resistance of the power cable can be improved.

[0050] Experiment Example 2 For the sheath layer of the cross-linked polyethylene insulated corrosion-resistant power cable prepared in Examples 2 and 4-10, the tensile strength of the specimen was tested according to the test method specified in GB / T 1040.2-2022. The test speed was 200 mm / min and the specimen type was 1A.

[0051] The test results are shown in Table 2: Table 2 Performance test results of Examples 2 and 4-10

[0052] As shown in Table 2, when talc powder is compounded with aminopropylsilane coupling agent and epoxypropoxysilane coupling agent in sequence, the resulting composite talc powder can be added to the sheath layer of power cables to further improve the strength of the power cables.

[0053] 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 cross-linked polyethylene insulated corrosion-resistant power cable, comprising a conductor, an insulation layer, and a sheath layer arranged sequentially from the inside out, characterized in that, The sheath layer comprises the following raw materials in parts by weight: 60-80 parts of polyvinyl chloride (PVC), 8-12 parts of polyacrylonitrile-butadiene-styrene (PAB-S), 1-3 parts of compatibilizer, 20-30 parts of filler, and 10-15 parts of additives; the flow shrinkage rate of the PVC is 0.4%-0.5%, the vertical shrinkage rate of the PVC is 0.6%-1.2%, the flow shrinkage rate of the PAB-S is 0.4%-0.5%, and the vertical shrinkage rate of the PAB-S is 0.5%-0.8%.

2. The cross-linked polyethylene insulated corrosion-resistant power cable according to claim 1, characterized in that, The conductor is made of copper or aluminum.

3. The cross-linked polyethylene insulated corrosion-resistant power cable according to claim 1, characterized in that, The insulation layer is a cross-linked polyethylene insulation layer.

4. The cross-linked polyethylene insulated corrosion-resistant power cable according to claim 1, characterized in that, The compatibilizer includes one or more of methyl methacrylate-butadiene-styrene copolymer, ethylene-vinyl acetate copolymer, and maleic anhydride-grafted polypropylene.

5. The cross-linked polyethylene insulated corrosion-resistant power cable according to claim 1, characterized in that, The filler includes one or more of calcium carbonate, talc, and carbon black.

6. A cross-linked polyethylene insulated corrosion-resistant power cable according to claim 5, characterized in that, When the filler includes talc, the talc is a composite talc, which comprises the following components by weight: 100 parts talc, 6-8 parts aminopropylsilane coupling agent, and 4-6 parts epoxypropoxysilane coupling agent.

7. A cross-linked polyethylene insulated corrosion-resistant power cable according to claim 6, characterized in that, The aminopropylsilane coupling agent comprises one or more of 3-aminopropyltriethoxysilane, 3-aminopropylmethyldiethoxysilane, and (3-aminopropyl)trimethoxysilane; and / or The epoxypropoxysilane coupling agent includes one or both of 3-(2,3-epoxypropoxy)propyltriethoxysilane and γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

8. A cross-linked polyethylene insulated corrosion-resistant power cable according to claim 6, characterized in that, The preparation method of the composite talc powder includes the following steps: dispersing an aminopropylsilane coupling agent in a solvent, adding talc powder, stirring, then adding an epoxypropoxysilane coupling agent, mixing, and drying to obtain the composite talc powder.

9. A cross-linked polyethylene insulated corrosion-resistant power cable according to claim 1, characterized in that, The additives consist of heat stabilizers, lubricants, antioxidants, and plasticizers in a mass ratio of 4~5:4:0.8:

3.

10. A cross-linked polyethylene insulated corrosion-resistant power cable according to claim 9, characterized in that, The heat stabilizer includes one or two of calcium-zinc composite heat stabilizers and butyltin heat stabilizers; and / or The lubricant includes one or two of polyethylene wax and stearic acid; and / or The antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1 to 2; and / or The plasticizer includes one or more of dioctyl phthalate, dioctyl terephthalate, and trioctyl trimellitate.

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