Extrusion insulation low-voltage power cable

Abstract

The invention relates to the technical field of cables, and provides an extruded insulation low-voltage power cable which sequentially comprises a conductor, an insulation layer, an armor layer and a sheath layer from inside to outside. The sheath layer is prepared from the following raw material components in parts by weight: 80 to 100 parts of polyvinyl chloride, 10 to 20 parts of ethylene propylene diene monomer, 15 to 25 parts of ethylene vinyl acetate copolymer, 20 to 30 parts of filler, 25 to 35 parts of flame retardant, 3 to 5 parts of plasticizer, 1 to 3 parts of antioxidant and 3 to 5 parts of compatilizer; the filler is obtained by modifying potassium titanate whiskers with a titanate coupling agent and diethyl aminovinylmalonate, and the insulating layer is obtained by extruding an insulating layer material on the outer side of the conductor. According to the technical scheme, the problem of insufficient tensile strength of the sheath layer in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and more specifically, to an extruded insulated low-voltage power cable. Background Technology

[0002] Extruded insulated low-voltage power cables, as a key component of power transmission systems, are widely used in various fields such as industrial production, civil construction, municipal engineering, and new energy. In industrial plants, they provide stable low-voltage power supply for various production equipment and automated control systems; in residential communities and commercial complexes, they are responsible for transmitting power to lighting, home appliances, elevators, and other electrical equipment within buildings; in municipal roads, parks, and other public areas, they are used to ensure power supply for streetlights, monitoring equipment, and various public service facilities; at the same time, with the development of new energy industries such as photovoltaics and wind power, these cables are also widely used in the low-voltage side power transmission of distributed energy systems, serving as the fundamental carrier for ensuring the safe and stable operation of various low-voltage power consumption scenarios.

[0003] As the outermost protective structure of extruded insulated low-voltage power cables, the sheath layer plays an indispensable and crucial role. During the cable laying stage, if the tensile strength of the sheath layer is insufficient when subjected to dragging or pulling forces, it will lead to cracking and tearing of the sheath layer, causing the inner insulation layer to be directly exposed to the external environment, accelerating the aging and failure of the insulation layer, and causing leakage and short circuit faults. Therefore, it is of great significance to develop an extruded insulated low-voltage power cable with excellent tensile strength. Summary of the Invention

[0004] This invention proposes an extruded insulated low-voltage power cable, which solves the problem of insufficient tensile strength of the sheath layer in related technologies.

[0005] The technical solution of the present invention is as follows: This invention proposes an extruded insulated low-voltage power cable, comprising, from the inside out, a conductor, an insulation layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 80-100 parts polyvinyl chloride, 10-20 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 15-25 parts vinyl acetate copolymer, 20-30 parts filler, 25-35 parts flame retardant, 3-5 parts plasticizer, 1-3 parts antioxidant, and 3-5 parts compatibilizer; the filler is obtained by modifying potassium titanate whiskers with titanate coupling agent and diethyl aminovinyl malonate, and the insulating layer is obtained by extruding insulating layer material onto the outside of the conductor.

[0006] As a further technical solution, the mass ratio of potassium titanate whiskers, titanate coupling agent, and diethyl aminovinyl malonate is 100:5:2~5, preferably 100:5:4.

[0007] As a further technical solution, the preparation method of the filler is as follows: after the titanate coupling agent and diethyl aminovinyl malonate are added to the solvent and dispersed evenly, potassium titanate whiskers are added and mixed, and then filtered and dried to obtain the filler.

[0008] As a further technical solution, the solvent is anhydrous ethanol.

[0009] As a further technical solution, the mixing temperature is 30~50℃, and the mixing time is 1~2h.

[0010] As a further technical solution, the ethylene Vinyl acetate copolymer is composed of first ethylene Vinyl acetate copolymer and second ethylene Composed of vinyl acetate copolymer, the first ethylene Vinyl acetate copolymer and second ethylene The vinyl acetate content varies in vinyl acetate copolymers.

[0011] As a further technical solution, the first ethylene The vinyl acetate copolymer has a vinyl acetate content of 19 wt%, and the second ethylene The vinyl acetate content of the vinyl acetate copolymer is 33 wt%.

[0012] This invention involves adding a first ethylene compound with a vinyl acetate content of 19 wt%. Vinyl acetate copolymer and second ethylene with a vinyl acetate content of 33 wt%. The vinyl acetate copolymer compound improves the impact strength of the extruded insulation sheath of low-voltage power cables, wherein the first ethylene... Vinyl acetate copolymers have a low vinyl acetate content and high crystallinity, providing good rigid support and basic strength for sheath materials. However, their molecular chain flexibility is relatively insufficient, making them prone to brittle cracking due to stress concentration under instantaneous impact. Second ethylene... The vinyl acetate copolymer has a higher vinyl acetate content and better molecular chain flexibility, which can effectively absorb and dissipate energy through the extension and rebound of the molecular chain when subjected to impact; thus effectively improving the impact resistance of the cable sheath.

[0013] As a further technical solution, the first ethylene Vinyl acetate copolymer and second ethylene The mass ratio of the vinyl acetate copolymer is 5:6 to 8, preferably 5:7.

[0014] As a further technical solution, the flame retardant includes one or both of magnesium hydroxide and aluminum hydroxide.

[0015] As a further technical solution, the plasticizer includes one or more of diisononyl phthalate, dioctyl phthalate, and epoxidized soybean oil.

[0016] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1035.

[0017] As a further technical solution, the compatibilizer is maleic anhydride-grafted polyethylene.

[0018] The working principle and beneficial effects of this invention are as follows: In this invention, potassium titanate whiskers modified with titanate coupling agent and diethyl aminovinyl malonate are used as fillers to improve the tensile strength of the extruded insulated low-voltage power cable sheath. Potassium titanate whiskers possess excellent mechanical properties; however, they are prone to agglomeration, hindering their performance. Diethyl aminovinyl malonate contains amino groups that can form hydrogen bonds with the hydroxyl groups on the surface of potassium titanate whiskers. Simultaneously, the ester groups in its molecular structure increase compatibility with the polar components of polyvinyl chloride and ethylene-vinyl acetate copolymer in the sheath matrix, effectively preventing agglomeration of the potassium titanate whiskers and thus improving the tensile strength of the extruded insulated low-voltage power cable sheath. Furthermore, the titanate coupling agent can form covalent bonds with the hydroxyl groups on the surface of potassium titanate whiskers through its alkoxy groups, further improving the dispersibility of the potassium titanate whiskers and further enhancing the tensile strength of the extruded insulated low-voltage power cable sheath. Detailed Implementation

[0019] 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.

[0020] In the following examples and comparative examples: Polyvinyl chloride, model: SG5, manufacturer: Xinjiang Tianye Co., Ltd.; Ethylene propylene diene monomer (EPDM) rubber, model: 4760P, manufacturer: Dow Chemical Company, USA; First Ethylene Vinyl acetate copolymer, vinyl acetate content 19wt%, model EA19400, manufacturer: LG Chem Co., Ltd., South Korea; Second ethylene Vinyl acetate copolymer, with a vinyl acetate content of 33wt%, model EA33045, manufacturer: LG Chem Co., Ltd., South Korea; Potassium titanate whiskers, average particle size: 0.4 μm, average length: 10 μm; Magnesium hydroxide, average particle size: 1.4 μm; Maleic anhydride-grafted polyethylene, model: ZJ-800E.

[0021] Example 1 An extruded insulated low-voltage power cable comprises, from the inside out, a conductor, an insulation layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 80 parts polyvinyl chloride, 10 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 15 parts vinyl acetate copolymer, 20 parts filler, 25 parts magnesium hydroxide, 3 parts diisononyl phthalate, 1 part antioxidant 1010, and 3 parts maleic anhydride-grafted polyethylene, wherein ethylene... Vinyl acetate copolymer is the first ethylene vinyl acetate copolymer; The filler was prepared as follows: KR-TTS titanate coupling agent and diethyl aminovinyl malonate were added to anhydrous ethanol and dispersed evenly. Potassium titanate whiskers were then added and mixed at 30°C for 2 hours. After filtration and drying, the filler was obtained. The mass-volume ratio of potassium titanate whiskers to anhydrous ethanol was 1 g:10 mL, and the mass ratio of potassium titanate whiskers, KR-TTS titanate coupling agent, and diethyl aminovinyl malonate was 100:5:2. A method for manufacturing an extruded insulated low-voltage power cable includes the following steps: S1. Extruding insulating material onto the outside of the conductor to form an insulating layer; S2. Two parallel steel strips are spirally wrapped around the outside of the insulation layer to form an armor layer. S3. After the raw materials of the sheath layer are mixed evenly, they are extruded and wrapped on the outside of the armor layer to form a sheath layer, thus obtaining an extruded insulated low-voltage power cable.

[0022] Example 2 An extruded insulated low-voltage power cable comprises, from the inside out, a conductor, an insulation layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 90 parts polyvinyl chloride, 15 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 20 parts vinyl acetate copolymer, 25 parts filler, 30 parts magnesium hydroxide, 4 parts diisononyl phthalate, 2 parts antioxidant 1010, and 4 parts maleic anhydride-grafted polyethylene, wherein ethylene... Vinyl acetate copolymer is the first ethylene vinyl acetate copolymer; The filler was prepared as follows: KR-TTS titanate coupling agent and diethyl aminovinyl malonate were added to anhydrous ethanol and dispersed evenly. Potassium titanate whiskers were then added and mixed at 40°C for 1.5 h. After filtration and drying, the filler was obtained. The mass-volume ratio of potassium titanate whiskers to anhydrous ethanol was 1 g:10 mL, and the mass ratio of potassium titanate whiskers, KR-TTS titanate coupling agent, and diethyl aminovinyl malonate was 100:5:2. A method for manufacturing an extruded insulated low-voltage power cable includes the following steps: S1. Extruding insulating material onto the outside of the conductor to form an insulating layer; S2. Two parallel steel strips are spirally wrapped around the outside of the insulation layer to form an armor layer. S3. After the raw materials of the sheath layer are mixed evenly, they are extruded and wrapped on the outside of the armor layer to form a sheath layer, thus obtaining an extruded insulated low-voltage power cable.

[0023] Example 3 An extruded insulated low-voltage power cable comprises, from the inside out, a conductor, an insulation layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 100 parts polyvinyl chloride, 20 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 25 parts vinyl acetate copolymer, 30 parts filler, 35 parts magnesium hydroxide, 5 parts diisononyl phthalate, 3 parts antioxidant 1010, and 5 parts maleic anhydride-grafted polyethylene, wherein ethylene... Vinyl acetate copolymer is the first ethylene vinyl acetate copolymer; The filler was prepared as follows: KR-TTS titanate coupling agent and diethyl aminovinyl malonate were added to anhydrous ethanol and dispersed evenly. Potassium titanate whiskers were then added and mixed at 50°C for 1 hour. After filtration and drying, the filler was obtained. The mass-volume ratio of potassium titanate whiskers to anhydrous ethanol was 1 g:10 mL, and the mass ratio of potassium titanate whiskers, KR-TTS titanate coupling agent, and diethyl aminovinyl malonate was 100:5:2. A method for manufacturing an extruded insulated low-voltage power cable includes the following steps: S1. Extruding insulating material onto the outside of the conductor to form an insulating layer; S2. Two parallel steel strips are spirally wrapped around the outside of the insulation layer to form an armor layer. S3. After the raw materials of the sheath layer are mixed evenly, they are extruded and wrapped on the outside of the armor layer to form a sheath layer, thus obtaining an extruded insulated low-voltage power cable.

[0024] Example 4 An extruded insulated low-voltage power cable comprises, from the inside out, a conductor, an insulation layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 90 parts polyvinyl chloride, 15 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 20 parts vinyl acetate copolymer, 25 parts filler, 30 parts magnesium hydroxide, 4 parts diisononyl phthalate, 2 parts antioxidant 1010, and 4 parts maleic anhydride-grafted polyethylene, wherein ethylene... Vinyl acetate copolymer is the first ethylene vinyl acetate copolymer; The filler was prepared as follows: KR-TTS titanate coupling agent and diethyl aminovinyl malonate were added to anhydrous ethanol and dispersed evenly. Potassium titanate whiskers were then added and mixed at 40°C for 1.5 h. After filtration and drying, the filler was obtained. The mass-volume ratio of potassium titanate whiskers to anhydrous ethanol was 1 g:10 mL, and the mass ratio of potassium titanate whiskers, KR-TTS titanate coupling agent, and diethyl aminovinyl malonate was 100:5:4. A method for manufacturing an extruded insulated low-voltage power cable includes the following steps: S1. Extruding insulating material onto the outside of the conductor to form an insulating layer; S2. Two parallel steel strips are spirally wrapped around the outside of the insulation layer to form an armor layer. S3. After the raw materials of the sheath layer are mixed evenly, they are extruded and wrapped on the outside of the armor layer to form a sheath layer, thus obtaining an extruded insulated low-voltage power cable.

[0025] Example 5 An extruded insulated low-voltage power cable comprises, from the inside out, a conductor, an insulation layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 90 parts polyvinyl chloride, 15 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 20 parts vinyl acetate copolymer, 25 parts filler, 30 parts magnesium hydroxide, 4 parts diisononyl phthalate, 2 parts antioxidant 1010, and 4 parts maleic anhydride-grafted polyethylene, wherein ethylene... Vinyl acetate copolymer is the first ethylene vinyl acetate copolymer; The filler was prepared as follows: KR-TTS titanate coupling agent and diethyl aminovinyl malonate were added to anhydrous ethanol and dispersed evenly. Potassium titanate whiskers were then added and mixed at 40°C for 1.5 h. After filtration and drying, the filler was obtained. The mass-volume ratio of potassium titanate whiskers to anhydrous ethanol was 1 g:10 mL, and the mass ratio of potassium titanate whiskers, KR-TTS titanate coupling agent, and diethyl aminovinyl malonate was 20:1:1. A method for manufacturing an extruded insulated low-voltage power cable includes the following steps: S1. Extruding insulating material onto the outside of the conductor to form an insulating layer; S2. Two parallel steel strips are spirally wrapped around the outside of the insulation layer to form an armor layer. S3. After the raw materials of the sheath layer are mixed evenly, they are extruded and wrapped on the outside of the armor layer to form a sheath layer, thus obtaining an extruded insulated low-voltage power cable.

[0026] Example 6 An extruded insulated low-voltage power cable comprises, from the inside out, a conductor, an insulation layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 90 parts polyvinyl chloride, 15 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 20 parts vinyl acetate copolymer, 25 parts filler, 30 parts magnesium hydroxide, 4 parts diisononyl phthalate, 2 parts antioxidant 1010, and 4 parts maleic anhydride-grafted polyethylene, wherein ethylene... Vinyl acetate copolymer is a second ethylene vinyl acetate copolymer; The filler was prepared as follows: KR-TTS titanate coupling agent and diethyl aminovinyl malonate were added to anhydrous ethanol and dispersed evenly. Potassium titanate whiskers were then added and mixed at 40°C for 1.5 h. After filtration and drying, the filler was obtained. The mass-volume ratio of potassium titanate whiskers to anhydrous ethanol was 1 g:10 mL, and the mass ratio of potassium titanate whiskers, KR-TTS titanate coupling agent, and diethyl aminovinyl malonate was 100:5:2. A method for manufacturing an extruded insulated low-voltage power cable includes the following steps: S1. Extruding insulating material onto the outside of the conductor to form an insulating layer; S2. Two parallel steel strips are spirally wrapped around the outside of the insulation layer to form an armor layer. S3. After the raw materials of the sheath layer are mixed evenly, they are extruded and wrapped on the outside of the armor layer to form a sheath layer, thus obtaining an extruded insulated low-voltage power cable.

[0027] Example 7 An extruded insulated low-voltage power cable comprises, from the inside out, a conductor, an insulation layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 90 parts polyvinyl chloride, 15 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 20 parts vinyl acetate copolymer, 25 parts filler, 30 parts magnesium hydroxide, 4 parts diisononyl phthalate, 2 parts antioxidant 1010, and 4 parts maleic anhydride-grafted polyethylene, wherein ethylene... Vinyl acetate copolymer is composed of a first ethylene in a mass ratio of 5:6 Vinyl acetate copolymer and second ethylene Composition of vinyl acetate copolymer; The filler was prepared as follows: KR-TTS titanate coupling agent and diethyl aminovinyl malonate were added to anhydrous ethanol and dispersed evenly. Potassium titanate whiskers were then added and mixed at 40°C for 1.5 h. After filtration and drying, the filler was obtained. The mass-volume ratio of potassium titanate whiskers to anhydrous ethanol was 1 g:10 mL, and the mass ratio of potassium titanate whiskers, KR-TTS titanate coupling agent, and diethyl aminovinyl malonate was 100:5:2. A method for manufacturing an extruded insulated low-voltage power cable includes the following steps: S1. Extruding insulating material onto the outside of the conductor to form an insulating layer; S2. Two parallel steel strips are spirally wrapped around the outside of the insulation layer to form an armor layer. S3. After the raw materials of the sheath layer are mixed evenly, they are extruded and wrapped on the outside of the armor layer to form a sheath layer, thus obtaining an extruded insulated low-voltage power cable.

[0028] Example 8 An extruded insulated low-voltage power cable comprises, from the inside out, a conductor, an insulation layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 90 parts polyvinyl chloride, 15 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 20 parts vinyl acetate copolymer, 25 parts filler, 30 parts magnesium hydroxide, 4 parts diisononyl phthalate, 2 parts antioxidant 1010, and 4 parts maleic anhydride-grafted polyethylene, wherein ethylene... Vinyl acetate copolymer is composed of a first ethylene in a mass ratio of 5:7 Vinyl acetate copolymer and second ethylene Composition of vinyl acetate copolymer; The filler was prepared as follows: KR-TTS titanate coupling agent and diethyl aminovinyl malonate were added to anhydrous ethanol and dispersed evenly. Potassium titanate whiskers were then added and mixed at 40°C for 1.5 h. After filtration and drying, the filler was obtained. The mass-volume ratio of potassium titanate whiskers to anhydrous ethanol was 1 g:10 mL, and the mass ratio of potassium titanate whiskers, KR-TTS titanate coupling agent, and diethyl aminovinyl malonate was 100:5:2. A method for manufacturing an extruded insulated low-voltage power cable includes the following steps: S1. Extruding insulating material onto the outside of the conductor to form an insulating layer; S2. Two parallel steel strips are spirally wrapped around the outside of the insulation layer to form an armor layer. S3. After the raw materials of the sheath layer are mixed evenly, they are extruded and wrapped on the outside of the armor layer to form a sheath layer, thus obtaining an extruded insulated low-voltage power cable.

[0029] Example 9 An extruded insulated low-voltage power cable comprises, from the inside out, a conductor, an insulation layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 90 parts polyvinyl chloride, 15 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 20 parts vinyl acetate copolymer, 25 parts filler, 30 parts magnesium hydroxide, 4 parts diisononyl phthalate, 2 parts antioxidant 1010, and 4 parts maleic anhydride-grafted polyethylene, wherein ethylene... Vinyl acetate copolymer is composed of a first ethylene in a mass ratio of 5:8 Vinyl acetate copolymer and second ethylene Composition of vinyl acetate copolymer; The filler was prepared as follows: KR-TTS titanate coupling agent and diethyl aminovinyl malonate were added to anhydrous ethanol and dispersed evenly. Potassium titanate whiskers were then added and mixed at 40°C for 1.5 h. After filtration and drying, the filler was obtained. The mass-volume ratio of potassium titanate whiskers to anhydrous ethanol was 1 g:10 mL, and the mass ratio of potassium titanate whiskers, KR-TTS titanate coupling agent, and diethyl aminovinyl malonate was 100:5:2. A method for manufacturing an extruded insulated low-voltage power cable includes the following steps: S1. Extruding insulating material onto the outside of the conductor to form an insulating layer; S2. Two parallel steel strips are spirally wrapped around the outside of the insulation layer to form an armor layer. S3. After the raw materials of the sheath layer are mixed evenly, they are extruded and wrapped on the outside of the armor layer to form a sheath layer, thus obtaining an extruded insulated low-voltage power cable.

[0030] Comparative Example 1 An extruded insulated low-voltage power cable comprises, from the inside out, a conductor, an insulation layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 80 parts polyvinyl chloride, 10 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 15 parts vinyl acetate copolymer, 20 parts potassium titanate whiskers, 25 parts magnesium hydroxide, 3 parts diisononyl phthalate, 1 part antioxidant 1010, and 3 parts maleic anhydride-grafted polyethylene, wherein ethylene... Vinyl acetate copolymer is the first ethylene vinyl acetate copolymer; A method for manufacturing an extruded insulated low-voltage power cable includes the following steps: S1. Extruding insulating material onto the outside of the conductor to form an insulating layer; S2. Two parallel steel strips are spirally wrapped around the outside of the insulation layer to form an armor layer. S3. After the raw materials of the sheath layer are mixed evenly, they are extruded and wrapped on the outside of the armor layer to form a sheath layer, thus obtaining an extruded insulated low-voltage power cable.

[0031] Comparative Example 2 An extruded insulated low-voltage power cable comprises, from the inside out, a conductor, an insulation layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 80 parts polyvinyl chloride, 10 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 15 parts vinyl acetate copolymer, 20 parts filler, 25 parts magnesium hydroxide, 3 parts diisononyl phthalate, 1 part antioxidant 1010, and 3 parts maleic anhydride-grafted polyethylene, wherein ethylene... Vinyl acetate copolymer is the first ethylene vinyl acetate copolymer; The filler was prepared as follows: KR-TTS titanate coupling agent was added to anhydrous ethanol and dispersed evenly. Potassium titanate whiskers were added and mixed at 30°C for 2 hours. After filtration and drying, the filler was obtained. The mass-volume ratio of potassium titanate whiskers to anhydrous ethanol was 1 g:10 mL, and the mass ratio of potassium titanate whiskers to titanate coupling agent KR-TTS was 100:7. A method for manufacturing an extruded insulated low-voltage power cable includes the following steps: S1. Extruding insulating material onto the outside of the conductor to form an insulating layer; S2. Two parallel steel strips are spirally wrapped around the outside of the insulation layer to form an armor layer. S3. After the raw materials of the sheath layer are mixed evenly, they are extruded and wrapped on the outside of the armor layer to form a sheath layer, thus obtaining an extruded insulated low-voltage power cable.

[0032] Comparative Example 3 An extruded insulated low-voltage power cable comprises, from the inside out, a conductor, an insulation layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 80 parts polyvinyl chloride, 10 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 15 parts vinyl acetate copolymer, 20 parts filler, 25 parts magnesium hydroxide, 3 parts diisononyl phthalate, 1 part antioxidant 1010, and 3 parts maleic anhydride-grafted polyethylene, wherein ethylene... Vinyl acetate copolymer is the first ethylene vinyl acetate copolymer; The filler is prepared as follows: diethyl aminovinyl malonate is added to anhydrous ethanol and dispersed evenly. Potassium titanate whiskers are added and mixed at 30°C for 2 hours. After filtration and drying, the filler is obtained. The mass-volume ratio of potassium titanate whiskers to anhydrous ethanol is 1g:10mL, and the mass ratio of potassium titanate whiskers to diethyl aminovinyl malonate is 100:7. A method for manufacturing an extruded insulated low-voltage power cable includes the following steps: S1. Extruding insulating material onto the outside of the conductor to form an insulating layer; S2. Two parallel steel strips are spirally wrapped around the outside of the insulation layer to form an armor layer. S3. After the raw materials of the sheath layer are mixed evenly, they are extruded and wrapped on the outside of the armor layer to form a sheath layer, thus obtaining an extruded insulated low-voltage power cable.

[0033] Experimental Example 1 The sheath layers of the extruded insulated low-voltage power cables prepared in Examples 1-5 and Comparative Examples 1-3 were tested for tensile strength according to GB / T2951.11-2008 "General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 11: General Test Methods - Thickness and Dimensional Measurement - Mechanical Properties Test". The specimens were dumbbell specimens, and the moving speed was 250 mm / min. The test results are shown in Table 1 below.

[0034] Table 1 Performance test results of Examples 1-5 and Comparative Examples 1-3

[0035] The tensile strength of Examples 1-5 is higher than that of Comparative Examples 1-3, indicating that the present invention improves the tensile strength of the sheath layer of extruded insulated low-voltage power cables by adding potassium titanate whiskers modified with titanate coupling agent and diethyl aminovinyl malonate as filler.

[0036] Experimental Example 2 The sheath layers of the extruded insulated low-voltage power cables prepared in Examples 2 and 6-9 were subjected to unnotched impact strength tests of simply supported beams according to the method of GB / T1043.1-2008 "Determination of impact properties of simply supported beams of plastics - Part 1: Non-instrumental impact test". The test specimens were type 1 specimens with a thickness of 4 mm. The test results are shown in Table 2 below.

[0037] Table 2. Test results of the mechanical properties of the sheath layer in Examples 2 and 6-9.

[0038] The impact strength of Examples 7-9 is higher than that of Examples 2 and 6, indicating that the present invention, by adding a first ethylene with a vinyl acetate content of 19 wt%, achieves the desired impact strength. Vinyl acetate copolymer and second ethylene with a vinyl acetate content of 33 wt%. The compounding of vinyl acetate copolymer improves the impact strength of the sheath layer of extruded insulated low-voltage power cables.

[0039] 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. An extruded insulated low-voltage power cable, characterized in that, From the inside out, it comprises a conductor, an insulating layer, an armor layer, and a sheath layer. The sheath layer is made of the following components by weight: 80-100 parts polyvinyl chloride, 10-20 parts ethylene propylene diene monomer (EPDM) rubber, and ethylene... The composition includes 15-25 parts vinyl acetate copolymer, 20-30 parts filler, 25-35 parts flame retardant, 3-5 parts plasticizer, 1-3 parts antioxidant, and 3-5 parts compatibilizer; the filler is obtained by modifying potassium titanate whiskers with titanate coupling agent and diethyl aminovinyl malonate, and the insulating layer is obtained by extruding insulating layer material onto the outside of the conductor.

2. The extruded insulated low-voltage power cable according to claim 1, characterized in that, The mass ratio of potassium titanate whiskers, titanate coupling agent, and diethyl aminovinyl malonate is 100:5:2~5.

3. The extruded insulated low-voltage power cable according to claim 1, characterized in that, The filler is prepared as follows: titanate coupling agent and diethyl aminovinyl malonate are added to a solvent and dispersed evenly. Potassium titanate whiskers are added and mixed. The mixture is then filtered and dried to obtain the filler.

4. The extruded insulated low-voltage power cable according to claim 3, characterized in that, The solvent is anhydrous ethanol.

5. The extruded insulated low-voltage power cable according to claim 3, characterized in that, The mixing temperature is 30~50℃, and the mixing time is 1~2h.

6. The extruded insulated low-voltage power cable according to claim 1, characterized in that, The ethylene Vinyl acetate copolymer is composed of first ethylene Vinyl acetate copolymer and second ethylene Composed of vinyl acetate copolymer, the first ethylene Vinyl acetate copolymer and second ethylene The vinyl acetate content varies in vinyl acetate copolymers.

7. The extruded insulated low-voltage power cable according to claim 6, characterized in that, The first ethylene The vinyl acetate copolymer has a vinyl acetate content of 19 wt%, and the second ethylene The vinyl acetate content of the vinyl acetate copolymer is 33 wt%.

8. The extruded insulated low-voltage power cable according to claim 6, characterized in that, The first ethylene Vinyl acetate copolymer and second ethylene The mass ratio of vinyl acetate copolymer is 5:6~8.

9. The extruded insulated low-voltage power cable according to claim 1, characterized in that, The flame retardant includes one or both of magnesium hydroxide and aluminum hydroxide.

10. The extruded insulated low-voltage power cable according to claim 1, characterized in that, The plasticizer includes one or more of diisononyl phthalate, dioctyl phthalate, and epoxidized soybean oil.

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