Flame-retardant wear-resistant high-voltage cable and preparation method thereof

Abstract

The invention discloses a flame-retardant wear-resistant high-voltage cable and a preparation method thereof, and relates to the technical field of cable sheath materials. The invention discloses a preparation method of a flame-retardant wear-resistant high-voltage cable, and the method comprises the following steps: arranging a flame-retardant wear-resistant sheath tube on the outer surface of a high-voltage cable to obtain the flame-retardant wear-resistant high-voltage cable; the flame-retardant wear-resistant sheath pipe is prepared by blending polypropylene, a functional additive, a plasticizer, a lubricant and an antioxidant, extruding, granulating and extruding by a pipe extruder. The functional additive prepared by the invention is added into the raw material components of the flame-retardant wear-resistant sheath tube, so that the sheath tube is endowed with excellent flame retardance and wear resistance, and the service life of a high-voltage cable is effectively prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of cable sheath materials, and in particular to a flame-retardant and wear-resistant high-voltage cable and a preparation method thereof. Background Art

[0002] With the acceleration of urbanization, the use of high-voltage power cables to transmit electricity has become a trend in today's urban power grid construction. The development and maturity of high-voltage cross-linked polyethylene insulated power cable manufacturing technology has made it the mainstream of high-voltage power cable manufacturing technology. At present, in the construction of the national power grid, in order to protect the urban landscape, power cable transmission lines have been transferred from overhead to underground. The main laying methods of the bottom line cable line are direct burial laying, trench laying, and pipe laying. Among them, pipe laying is widely used in the power industry due to its small footprint, construction suggestions, low construction cost, and short construction period. There are two main types of conduits for power cables: glass fiber reinforced plastic pipes and plastic pipes. The materials used for plastic pipes are mainly polyvinyl chloride, polyethylene, and polypropylene. Although glass fiber reinforced plastic pipes are resistant to high temperatures and high strength, they are not conducive to human health because of the pollution of the environment due to the product. In addition, they are expensive, easy to age, and have sharp pipe openings. They are easy to scratch the outer sheath of the cable, which brings hidden dangers to the safe operation of the cable. However, polyvinyl chloride has poor heat resistance and is not suitable for buried high-voltage power cable protection pipes.

[0003] At present, cable protection tubes are mostly made of polypropylene. Polypropylene tubes have the advantages of high strength, good toughness, high ring stiffness, not easy to break and good aging resistance. However, their wear resistance and flame retardancy are poor. Especially when laid as underground pipelines, due to the traction of the machine during the construction process, the pipelines will inevitably rub against underground sand or soil, causing irreversible wear on the pipelines, affecting the service life of the pipelines, greatly reducing the protection of the pipelines to the cables, and easily leading to short circuits in the cables in the pipes, causing combustion and other problems. Summary of the invention

[0004] The purpose of the present invention is to provide a flame retardant and wear resistant high voltage cable and a preparation method thereof, so as to solve the following technical problems: The existing polypropylene-based cable sheath pipe has poor wear resistance and flame retardancy. During the construction process, it causes irreversible wear to the pipeline, affecting the service life of the pipeline, greatly reducing the protection of the pipeline to the cable, and easily causing short circuits in the cables inside the pipe, causing combustion and other problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A method for preparing a flame-retardant and wear-resistant high-voltage cable comprises the following steps: arranging a flame-retardant and wear-resistant sheath tube on the outer surface of the high-voltage cable to obtain a flame-retardant and wear-resistant high-voltage cable; The preparation method of the flame retardant and wear resistant sheath pipe comprises the following steps: S1: According to the raw material ratio, polypropylene, functional additives, plasticizers, lubricants and antioxidants are blended to obtain a premix; S2: adding the premix to a twin-screw extruder for extrusion and granulation to obtain a masterbatch; S3: adding the masterbatch into a pipe extruder and extruding it to obtain a flame retardant and wear resistant sheath pipe; The preparation method of the functional additive comprises the following steps: A1: In a nitrogen atmosphere, aminosilane-modified graphene oxide, hexachlorocyclotriphosphazene, triethylamine and tetrahydrofuran are added into a reaction kettle, the temperature is controlled at 50-60°C, the reaction is kept warm for 12-24 hours, tetrahydrofuran is removed by rotary evaporation, ethyl acetate is added for filtration, ethanol washing, water washing and drying are performed to obtain component 1; A2: In a nitrogen atmosphere, add component 2, p-nitrophenol, potassium carbonate and acetone into a reaction kettle, heat and reflux for 2-4 hours, wash with water to obtain component 2; A3: Add component 2, copper sulfate, sodium borohydride and anhydrous ethanol into a reaction kettle and disperse evenly, stir at room temperature for 12-15 hours, filter, wash with water and dry to obtain component 3; A4: In a nitrogen atmosphere, add the components of trimethylol, xylene, and maleic anhydride grafted polypropylene into a reaction kettle, heat and reflux for 2-4 hours, filter, wash, and dry to obtain a functional additive.

[0006] As a further embodiment of the present invention: the addition ratio of aminosilane-modified graphene oxide, hexachlorocyclotriphosphazene, triethylamine and tetrahydrofuran in A1 is 10 g: 3.5-7 g: 5-8 g: 100-200 mL.

[0007] As a further solution of the present invention: the addition ratio of component 2, p-nitrophenol, potassium carbonate and acetone in A2 is 10g: 2-4g: 2-3g: 100-200mL.

[0008] As a further solution of the present invention: in A3, the addition ratio of component 2, copper sulfate, sodium borohydride and anhydrous ethanol is 10g: 0.1-0.5g: 0.5-1g: 100-200mL.

[0009] As a further solution of the present invention: the addition ratio of the components trimer, xylene, and maleic anhydride grafted polypropylene in A4 is 10 g: 100-200 mL: 1-2 g.

[0010] As a further embodiment of the present invention: the preparation method of aminosilane-modified graphene oxide comprises the following steps: Graphene oxide and deionized water are added to a reaction bottle and dispersed evenly, γ-aminopropyltriethoxysilane and anhydrous ethanol are mixed and added to a reactor, ultrasonically treated, the temperature is controlled at 60-70°C, the reaction is kept warm for 3-6 hours, filtered and dried to obtain aminosilane-modified graphene oxide.

[0011] As a further solution of the present invention: the addition ratio of graphene oxide, deionized water, γ-aminopropyltriethoxysilane and anhydrous ethanol is 10 g: 50-100 mL: 3-6 g: 50-100 mL.

[0012] As a further solution of the present invention: the flame-retardant and wear-resistant sheath pipe comprises the following raw materials in parts by weight: 100g of polypropylene, 20-50g of functional additives, 5-10g of plasticizer, 0.5-1.5g of lubricant, and 0.1-0.5g of antioxidant.

[0013] As a further solution of the present invention: the plasticizer is obtained by mixing methyl epoxyacetyl linoleate and octyl epoxysoybeanate in a mass ratio of 3:2-3.

[0014] As a further solution of the present invention: the lubricant is PP wax.

[0015] As a further embodiment of the present invention: the antioxidant is one or more of the antioxidant 1010 and the antioxidant 1076 mixed in any ratio.

[0016] As a further scheme of the present invention: the operating parameters of the twin-screw extruder are: zone 1 temperature 170-185°C, zone 2 temperature 200-210°C, zone 3 temperature 210-220°C, zone 4 temperature 220-225°C, zone 5 temperature 235-245°C, die head temperature 150-170°C, feed speed 100-150rpm, screw speed 200-300rpm.

[0017] As a further solution of the present invention: the operating parameters of the pipe extruder are: barrel zone 1 temperature 170-180°C, barrel zone 2 temperature 180-200°C, barrel zone 3 temperature 200-210°C, barrel zone 4 temperature 190-200°C, barrel zone 5 temperature 170-190°C, and extrusion speed 0.5mm / min.

[0018] As a further solution of the present invention: a method for preparing a high voltage cable comprises the following steps: B1: Multiple conductors are twisted to obtain a conductor core, and a conductive shielding layer, an insulating layer and an insulating shielding layer are extruded from the inside to the outside of the conductor core in a three-layer co-extrusion manner to obtain an insulated cable core; B2: The insulated core of the cable is wrapped with a water-blocking layer, and then the water-blocking layer is wrapped with a metal sheath layer and an outer sheath layer to obtain a high-voltage cable.

[0019] As a further solution of the present invention: the metal sheath layer is made of aluminum material; the conductor is a copper wire.

[0020] As a further solution of the present invention: the preparation method of the water-blocking layer is: winding a water-blocking rope on the surface of the cable insulation core, and then using a water-blocking yarn to wind the water-blocking rope and the cable insulation core together to obtain the water-blocking layer.

[0021] A flame-retardant and wear-resistant high-voltage cable is made by any one of the above-mentioned preparation methods.

[0022] Beneficial effects of the present invention: (1) The present application uses graphene oxide prepared by the Hummers method as a basis, first uses a silane coupling agent to perform organic siliconization treatment, and grafts amino groups on the surface of the graphene oxide to obtain aminosilane-modified graphene oxide; and uses the P-Cl of hexachlorocyclotriphosphazene to react with the amino groups of the aminosilane-modified graphene oxide to obtain component one; the -PN- structure generated in the reaction produces a synergistic flame retardant effect when burned; the present application then uses p-nitrophenol to treat component one to obtain component two, and uses a sodium borohydride reduction system to reduce the nitro group on component two to obtain component three grafted with multiple amino groups; the present application uses the amino group on component three to react with the anhydride on the maleic anhydride grafted polypropylene to generate an amide group, thereby achieving covalent grafting of the polypropylene chain to the surface of the graphene oxide to obtain a functional additive.

[0023] The functional additive prepared in the present application can effectively slow down the oxidative degradation rate of polypropylene and improve the stability and durability of the material; and the organic silicon molecular chain, -P=N-, -PN- and other structures contained therein and graphene oxide give the material excellent flame retardant properties; the structural characteristics of the graphene oxide itself and the organic molecular chains grafted on the surface can be combined with the macromolecular chains of polypropylene to form a three-dimensional cross-linked network structure, and the stress acts on the surface of the material and is dispersed from the cross-linking points through the network to other molecular chains, which plays a stabilizing role and gives the material excellent wear resistance.

[0024] (2) The high-voltage cable prepared in this application firstly twists a plurality of smooth copper wires to form a conductor core, and then co-extrudes a conductive shielding layer, an insulating layer and an insulating shielding layer on the surface of the conductor core to obtain a cable insulation core; wherein, the conductive shielding layer improves the electric field distribution on the conductor surface and removes the air gap between the insulating layer and the conductor; the insulating layer, as a structure that bears the working voltage, has the characteristics of voltage resistance and long-term stability; a water-blocking layer is wrapped around the surface of the cable insulation core, and after the water-blocking layer effectively prevents water from intruding, the cross-linked polyethylene insulation layer produces water dendrites under the action of the high-voltage electric field, thereby reducing the cable withstand voltage level; the water-blocking layer is coated with a corrugated aluminum tube as a metal sheath layer, which provides waterproof and mechanical protection for the cable and prevents damage by axial and radial external forces. An outer sheath layer is arranged outside the metal sheath layer, which can not only protect the metal sheath layer from mechanical damage and corrosion, but also provide mechanical protection for the high-voltage cable, and can also serve as an insulation layer for ground shielding. DETAILED DESCRIPTION

[0025] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0026] Example 1 The preparation method of the functional additive comprises the following steps: A1: 10 g of graphene oxide and 50 mL of deionized water were added to a reaction bottle and dispersed evenly, 3 g of γ-aminopropyltriethoxysilane and 50 mL of anhydrous ethanol were mixed and added to a reactor, ultrasonically treated, the temperature was controlled at 60°C, the reaction was kept warm for 3 h, filtered and dried to obtain aminosilane-modified graphene oxide; A2: In a nitrogen atmosphere, 10 g of aminosilane-modified graphene oxide, 3.5 g of hexachlorocyclotriphosphazene, 5 g of triethylamine, and 100 mL of tetrahydrofuran were added to a reaction kettle, the temperature was controlled at 50°C, and the reaction was kept warm for 12 h. The tetrahydrofuran was removed by rotary evaporation, ethyl acetate was added for filtration, ethanol was washed, water was washed, and dried to obtain component 1; A3: In a nitrogen atmosphere, add 10 g of component 2, 2 g of p-nitrophenol, 2 g of potassium carbonate, and 100 mL of acetone into a reaction kettle, heat and reflux for 2 h, and wash with water to obtain component 2; A4: Add 10g of component 2, 0.1g of copper sulfate, 0.5g of sodium borohydride and 100mL of anhydrous ethanol into a reaction kettle and disperse them evenly. Stir at room temperature for 12h, filter, wash with water and dry to obtain component 3. A5: In a nitrogen atmosphere, 10 g of component three, 100 mL of xylene, and 1 g of maleic anhydride grafted polypropylene (grafting rate 5%) were added to a reactor, the temperature was raised to reflux for 2 h, and then filtered, washed, and dried to obtain a functional additive.

[0027] Example 2 The preparation method of the functional additive comprises the following steps: A1: 10 g of graphene oxide and 70 mL of deionized water were added to a reaction bottle and dispersed evenly. 4.5 g of γ-aminopropyltriethoxysilane and 70 mL of anhydrous ethanol were mixed and added to a reactor. Ultrasonic treatment was performed and the temperature was controlled at 65°C. The reaction was kept warm for 4.5 h. The reaction was filtered and dried to obtain aminosilane-modified graphene oxide. A2: In a nitrogen atmosphere, 10 g of aminosilane-modified graphene oxide, 5 g of hexachlorocyclotriphosphazene, 6.5 g of triethylamine, and 150 mL of tetrahydrofuran were added to a reaction kettle, the temperature was controlled at 55°C, and the reaction was kept warm for 18 h. The tetrahydrofuran was removed by rotary evaporation, ethyl acetate was added for filtration, ethanol was washed, water was washed, and dried to obtain component 1; A3: In a nitrogen atmosphere, add 10 g of component 2, 3 g of p-nitrophenol, 2.5 g of potassium carbonate, and 150 mL of acetone into a reaction kettle, heat and reflux for 3 h, and wash with water to obtain component 2; A4: Add 10g of component 2, 0.3g of copper sulfate, 0.7g of sodium borohydride and 150mL of anhydrous ethanol into a reaction kettle and disperse evenly, stir at room temperature for 12h, filter, wash with water and dry to obtain component 3; A5: In a nitrogen atmosphere, 10 g of component three, 150 mL of xylene, and 1.5 g of maleic anhydride grafted polypropylene (grafting rate 5%) were added to a reactor, the temperature was raised to reflux for 3 h, and the product was filtered, washed, and dried to obtain a functional additive.

[0028] Example 3 The preparation method of the functional additive comprises the following steps: A1: 10 g of graphene oxide and 100 mL of deionized water were added to a reaction bottle and dispersed evenly, 6 g of γ-aminopropyltriethoxysilane and 100 mL of anhydrous ethanol were mixed and added to a reactor, ultrasonically treated, the temperature was controlled at 70°C, the reaction was kept warm for 6 h, filtered and dried to obtain aminosilane-modified graphene oxide; A2: In a nitrogen atmosphere, 10 g of aminosilane-modified graphene oxide, 7 g of hexachlorocyclotriphosphazene, 8 g of triethylamine, and 200 mL of tetrahydrofuran were added to a reaction kettle, the temperature was controlled at 60°C, and the reaction was kept warm for 24 h. The tetrahydrofuran was removed by rotary evaporation, ethyl acetate was added for filtration, ethanol was washed, water was washed, and dried to obtain component 1; A3: In a nitrogen atmosphere, 10 g of component 2, 4 g of p-nitrophenol, 3 g of potassium carbonate, and 200 mL of acetone were added to a reaction kettle, heated and refluxed for 4 h, and washed with water to obtain component 2; A4: Add 10g of component 2, 0.5g of copper sulfate, 1g of sodium borohydride and 200mL of anhydrous ethanol into a reaction kettle and disperse them evenly. Stir at room temperature for 15h, filter, wash with water and dry to obtain component 3. A5: In a nitrogen atmosphere, 10 g of component three, 200 mL of xylene, and 2 g of maleic anhydride grafted polypropylene (grafting rate 5%) were added to a reactor, the temperature was raised to reflux for 4 h, and the mixture was filtered, washed, and dried to obtain a functional additive.

[0029] Example 4 The method for preparing a flame retardant and wear resistant sheath pipe comprises the following steps: S1: According to the raw material ratio, 100g polypropylene (density 0.89-0.91g / cm 3 ), 30g of the functional additive prepared in Example 1, 3.5g of methyl epoxyacetyl linoleate, 3.5g of octyl epoxy soybean oleate, 0.6g of PP wax, and 0.4g of antioxidant 1010 were blended to obtain a premix; S2: adding the premix to a twin-screw extruder for extrusion and granulation (the operating parameters of the twin-screw extruder are: zone 1 temperature 170-185°C, zone 2 temperature 200-210°C, zone 3 temperature 210-220°C, zone 4 temperature 220-225°C, zone 5 temperature 235-245°C, die head temperature 150-170°C, feed speed 100-150rpm, screw speed 200-300rpm) to obtain a masterbatch; S3: Add the masterbatch into the pipe extruder for extrusion (the operating parameters of the pipe extruder are: barrel zone 1 temperature 170-180°C, barrel zone 2 temperature 180-200°C, barrel zone 3 temperature 200-210°C, barrel zone 4 temperature 190-200°C, barrel zone 5 temperature 170-190°C, extrusion speed 0.5mm / min) to obtain a flame retardant and wear-resistant sheath tube.

[0030] A method for preparing a flame-retardant and wear-resistant high-voltage cable comprises the following steps: B1: A conductor core is obtained by twisting a plurality of copper conductors, and a conductive shielding layer, an insulating layer and an insulating shielding layer are extruded from the inside to the outside of the conductor core in a three-layer co-extrusion manner to obtain an insulated cable core; B2: A water-blocking rope is wound around the outer surface of the cable insulation core, and then the water-blocking rope and the cable insulation core are wound together with a water-blocking yarn to obtain a water-blocking layer; then an aluminum metal sheath layer and an outer sheath layer are wrapped around the water-blocking layer to obtain a high-voltage cable; B3: The flame-retardant and wear-resistant sheath tube prepared above is arranged on the outer surface of the high-voltage cable to obtain a flame-retardant and wear-resistant high-voltage cable.

[0031] Example 5 Compared with Example 4, the flame retardant and wear-resistant jacket pipe prepared in Example 5 is prepared by replacing the functional additive prepared in Example 1 with the functional additive prepared in Example 2 in equal amount, and the other components and preparation method are completely the same as those in Example 4.

[0032] Compared with Example 4, the flame-retardant and wear-resistant high-voltage cable prepared in Example 5 is obtained by replacing the flame-retardant and wear-resistant sheath tube prepared in Example 4 with the flame-retardant and wear-resistant sheath tube prepared in Example 5, and the other components and preparation methods are exactly the same as those in Example 4.

[0033] Example 6 Compared with Example 4, the flame retardant and wear-resistant jacket pipe prepared in Example 6 is prepared by replacing the functional additive prepared in Example 1 with the functional additive prepared in Example 3 in equal amount, and the other components and preparation method are completely the same as those in Example 4.

[0034] Compared with Example 4, the flame-retardant and wear-resistant high-voltage cable prepared in Example 6 is obtained by replacing the flame-retardant and wear-resistant sheath tube prepared in Example 4 with the flame-retardant and wear-resistant sheath tube prepared in Example 6, and the other components and preparation methods are exactly the same as those in Example 4.

[0035] Comparative Example 1 The preparation method of the functional additive comprises the following steps: A1: 10 g of graphene oxide and 70 mL of deionized water were added to a reaction bottle and dispersed evenly. 4.5 g of γ-aminopropyltriethoxysilane and 70 mL of anhydrous ethanol were mixed and added to a reactor. Ultrasonic treatment was performed and the temperature was controlled at 65°C. The reaction was kept warm for 4.5 h. The reaction was filtered and dried to obtain aminosilane-modified graphene oxide. A2: In a nitrogen atmosphere, 10 g of aminosilane-modified graphene oxide, 5 g of hexachlorocyclotriphosphazene, 6.5 g of triethylamine, and 150 mL of tetrahydrofuran were added to a reaction kettle, the temperature was controlled at 55°C, and the reaction was kept warm for 18 h. The tetrahydrofuran was removed by rotary evaporation, ethyl acetate was added for filtration, ethanol was washed, water was washed, and dried to obtain component 1; A3: In a nitrogen atmosphere, add 10 g of component 2, 3 g of p-nitrophenol, 2.5 g of potassium carbonate, and 150 mL of acetone into a reaction kettle, heat and reflux for 3 h, and wash with water to obtain component 2; A4: Add 10g of component 2, 0.3g of copper sulfate, 0.7g of sodium borohydride and 150mL of anhydrous ethanol into a reaction kettle and disperse evenly. Stir at room temperature for 12h, filter, wash with water and dry to obtain a functional additive.

[0036] Comparative Example 2 The preparation method of the functional additive comprises the following steps: A1: 10 g of graphene oxide and 70 mL of deionized water were added to a reaction bottle and dispersed evenly. 4.5 g of γ-aminopropyltriethoxysilane and 70 mL of anhydrous ethanol were mixed and added to a reactor. Ultrasonic treatment was performed and the temperature was controlled at 65°C. The reaction was kept warm for 4.5 h. The reaction was filtered and dried to obtain aminosilane-modified graphene oxide. A2: In a nitrogen atmosphere, 10 g of aminosilane-modified graphene oxide, 5 g of hexachlorocyclotriphosphazene, 6.5 g of triethylamine, and 150 mL of tetrahydrofuran were added to a reactor, the temperature was controlled at 55°C, and the reaction was kept warm for 18 hours. The tetrahydrofuran was removed by rotary evaporation, ethyl acetate was added for filtration, ethanol washing, water washing, and drying to obtain a functional additive.

[0037] Comparative Example 3 The preparation method of the functional additive comprises the following steps: A1: 10 g of graphene oxide and 70 mL of deionized water were added to a reaction bottle and dispersed evenly. 4.5 g of γ-aminopropyltriethoxysilane and 70 mL of anhydrous ethanol were mixed and added to a reactor. Ultrasonic treatment was performed and the temperature was controlled at 65°C. The reaction was kept warm for 4.5 h. The reaction was filtered and dried to obtain aminosilane-modified graphene oxide. A2: In a nitrogen atmosphere, 10 g of aminosilane-modified graphene oxide, 150 mL of xylene, and 1.5 g of maleic anhydride-grafted polypropylene (grafting rate 5%) were added to a reactor, the temperature was raised and refluxed for 3 h, and then filtered, washed, and dried to obtain a functional additive.

[0038] Comparative Example 4 The preparation method of the functional additive comprises the following steps: A1: 10 g of graphene oxide and 70 mL of deionized water were added to a reaction bottle and dispersed evenly. 4.5 g of γ-aminopropyltriethoxysilane and 70 mL of anhydrous ethanol were mixed and added to a reactor. Ultrasonic treatment was performed and the temperature was controlled at 65°C. The reaction was kept warm for 4.5 h. The reaction was filtered and dried to obtain aminosilane-modified graphene oxide. A2: In a nitrogen atmosphere, 10 g of aminosilane-modified graphene oxide, 150 mL of xylene, and 1.5 g of maleic anhydride-grafted polypropylene (grafting rate 5%) were added to a reactor, heated and refluxed for 3 h, filtered, washed, and dried to obtain component 1; A3: 10 g of component 1 was mixed with 5 g of hexachlorocyclotriphosphazene to obtain a functional additive.

[0039] Comparative Example 5 The preparation method of the functional additive comprises the following steps: A1: 10 g of nano-silica and 70 mL of deionized water were added to a reaction bottle and dispersed evenly. 4.5 g of γ-aminopropyltriethoxysilane and 70 mL of anhydrous ethanol were mixed and added to a reaction kettle. Ultrasonic treatment was performed and the temperature was controlled at 65°C. The reaction was kept warm for 4.5 h. The mixture was filtered and dried to obtain aminosilane-modified silica. A2: In a nitrogen atmosphere, 10 g of aminosilane-modified silica, 5 g of hexachlorocyclotriphosphazene, 6.5 g of triethylamine, and 150 mL of tetrahydrofuran were added to a reaction kettle, the temperature was controlled at 55°C, and the reaction was kept warm for 18 h. The tetrahydrofuran was removed by rotary evaporation, ethyl acetate was added for filtration, ethanol was washed, water was washed, and dried to obtain component 1; A3: In a nitrogen atmosphere, add 10 g of component 2, 3 g of p-nitrophenol, 2.5 g of potassium carbonate, and 150 mL of acetone into a reaction kettle, heat and reflux for 3 h, and wash with water to obtain component 2; A4: Add 10g of component 2, 0.3g of copper sulfate, 0.7g of sodium borohydride and 150mL of anhydrous ethanol into a reaction kettle and disperse evenly, stir at room temperature for 12h, filter, wash with water and dry to obtain component 3; A5: In a nitrogen atmosphere, 10 g of component three, 150 mL of xylene, and 1.5 g of maleic anhydride grafted polypropylene (grafting rate 5%) were added to a reactor, the temperature was raised to reflux for 3 h, and the product was filtered, washed, and dried to obtain a functional additive.

[0040] Comparative Example 6 The flame retardant and wear resistant sheath pipe prepared in Comparative Example 6 is compared with Example 4, except that the functional additive prepared in Example 1 added in Example 4 is replaced by the functional additive prepared in Comparative Example 1 in equal amount, and the other components and preparation method are completely the same as those in Example 4.

[0041] Compared with Example 4, the flame-retardant and wear-resistant high-voltage cable prepared in Comparative Example 6 is obtained by replacing the flame-retardant and wear-resistant sheath tube prepared in Example 4 with the flame-retardant and wear-resistant sheath tube prepared in Comparative Example 6, and the remaining components and preparation methods are exactly the same as those in Example 4.

[0042] Comparative Example 7 The flame retardant and wear resistant jacket pipe prepared in Comparative Example 7 is compared with Example 4, except that the functional additive prepared in Example 1 added in Example 4 is replaced by the functional additive prepared in Comparative Example 2 in equal amount, and the other components and preparation method are completely the same as those in Example 4.

[0043] Compared with Example 4, the flame-retardant and wear-resistant high-voltage cable prepared in Comparative Example 7 is obtained by replacing the flame-retardant and wear-resistant sheath tube prepared in Example 4 with the flame-retardant and wear-resistant sheath tube prepared in Comparative Example 7, and the remaining components and preparation methods are exactly the same as those in Example 4.

[0044] Comparative Example 8 The flame retardant and wear resistant jacket pipe prepared in Comparative Example 8 is compared with Example 4, except that the functional additive prepared in Example 1 added in Example 4 is replaced by the functional additive prepared in Comparative Example 3 in equal amount, and the other components and preparation method are completely the same as those in Example 4.

[0045] Compared with Example 4, the flame-retardant and wear-resistant high-voltage cable prepared in Comparative Example 8 is obtained by replacing the flame-retardant and wear-resistant sheath tube prepared in Example 4 with the flame-retardant and wear-resistant sheath tube prepared in Comparative Example 8, and the remaining components and preparation methods are exactly the same as those in Example 4.

[0046] Comparative Example 9 The flame retardant and wear resistant sheath pipe prepared in Comparative Example 9 is compared with Example 4, except that the functional additive prepared in Example 1 added in Example 4 is replaced by the functional additive prepared in Comparative Example 4 in equal amount, and the other components and preparation method are completely the same as those in Example 4.

[0047] Compared with Example 4, the flame-retardant and wear-resistant high-voltage cable prepared in Comparative Example 9 is obtained by replacing the flame-retardant and wear-resistant sheath tube prepared in Example 4 with the flame-retardant and wear-resistant sheath tube prepared in Comparative Example 9, and the other components and preparation methods are exactly the same as those in Example 4.

[0048] Comparative Example 10 The flame retardant and wear resistant jacket pipe prepared in Comparative Example 10 is compared with Example 4, except that the functional additive prepared in Example 1 added in Example 4 is replaced by the functional additive prepared in Comparative Example 5 in equal amount, and the other components and preparation method are completely the same as those in Example 4.

[0049] Compared with Example 4, the flame-retardant and wear-resistant high-voltage cable prepared in Comparative Example 10 is obtained by replacing the flame-retardant and wear-resistant sheath tube prepared in Example 4 with the flame-retardant and wear-resistant sheath tube prepared in Comparative Example 10, and the other components and preparation methods are exactly the same as those in Example 4.

[0050] Performance Testing (1) Wear resistance: Tested according to GB / T 3960-2016 "Test methods for sliding friction and wear of plastics". The test results are shown in Table 1. (2) Flame retardant properties: tested in accordance with GB / T 2406.2-2009 "Plastics. Determination of combustion behavior by oxygen index method Part 2: Room temperature test", the test results are shown in Table 1; (3) Ring stiffness: Tested according to GB / T 9647-2003 "Determination of Ring Stiffness of Thermoplastic Pipes". The test results are shown in Table 1. (4) Flexural modulus: tested in accordance with GB / T 9341-2008 “Determination of flexural properties of plastics”. The test results are shown in Table 1. Table 1: Statistical table of performance test data of Examples 4-6 and Comparative Examples 6-10

[0051] As can be seen from Table 1, the functional additives prepared in the present application are added to the raw materials of the flame-retardant and wear-resistant sheath pipe, which gives the sheath pipe excellent wear resistance and flame retardancy, and maintains good mechanical properties of the pipe.

[0052] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for preparing a flame-retardant and wear-resistant high-voltage cable, characterized in that: The method comprises the following steps: arranging a flame-retardant and wear-resistant sheath tube on the outer surface of a high-voltage cable to obtain a flame-retardant and wear-resistant high-voltage cable; The preparation method of the flame retardant and wear resistant sheath pipe comprises the following steps: S1: According to the raw material ratio, polypropylene, functional additives, plasticizers, lubricants and antioxidants are blended to obtain a premix; S2: adding the premix to a twin-screw extruder for extrusion and granulation to obtain a masterbatch; S3: adding the masterbatch into a pipe extruder and extruding it to obtain a flame retardant and wear resistant sheath pipe; The preparation method of the functional additive comprises the following steps: A1: In a nitrogen atmosphere, aminosilane-modified graphene oxide, hexachlorocyclotriphosphazene, triethylamine and tetrahydrofuran are added into a reaction kettle, the temperature is controlled at 50-60°C, the reaction is kept warm for 12-24 hours, tetrahydrofuran is removed by rotary evaporation, ethyl acetate is added for filtration, ethanol washing, water washing and drying are performed to obtain component 1; A2: In a nitrogen atmosphere, add component 2, p-nitrophenol, potassium carbonate and acetone into a reaction kettle, heat and reflux for 2-4 hours, wash with water to obtain component 2; A3: Add component 2, copper sulfate, sodium borohydride and anhydrous ethanol into a reaction kettle and disperse evenly, stir at room temperature for 12-15 hours, filter, wash with water and dry to obtain component 3; A4: In a nitrogen atmosphere, add components of trimethylol, xylene, and maleic anhydride grafted polypropylene into a reaction kettle, heat and reflux for 2-4 hours, filter, wash, and dry to obtain a functional additive.

2. The method for preparing a flame-retardant and wear-resistant high-voltage cable according to claim 1, characterized in that: The addition ratio of aminosilane-modified graphene oxide, hexachlorocyclotriphosphazene, triethylamine, and tetrahydrofuran in A1 is 10 g: 3.5-7 g: 5-8 g: 100-200 mL.

3. The method for preparing a flame-retardant and wear-resistant high-voltage cable according to claim 1, characterized in that: The addition ratio of component 2, p-nitrophenol, potassium carbonate and acetone in A2 is 10g:2-4g:2-3g:100-200mL.

4. The method for preparing a flame-retardant and wear-resistant high-voltage cable according to claim 1, characterized in that: In A3, component 2, copper sulfate, sodium borohydride, and anhydrous ethanol are added in a ratio of 10 g: 0.1-0.5 g: 0.5-1 g: 100-200 mL.

5. The method for preparing a flame-retardant and wear-resistant high-voltage cable according to claim 1, characterized in that: The addition ratio of component three, xylene, and maleic anhydride grafted polypropylene in A4 is 10g:100-200mL:1-2g.

6. The method for preparing a flame-retardant and wear-resistant high-voltage cable according to claim 1, characterized in that: The preparation method of aminosilane-modified graphene oxide comprises the following steps: Graphene oxide and deionized water are added to a reaction bottle and dispersed evenly, γ-aminopropyltriethoxysilane and anhydrous ethanol are mixed and added to a reactor, ultrasonically treated, the temperature is controlled at 60-70°C, the reaction is kept warm for 3-6 hours, filtered and dried to obtain aminosilane-modified graphene oxide.

7. The method for preparing a flame-retardant and wear-resistant high-voltage cable according to claim 6, characterized in that: The addition ratio of graphene oxide, deionized water, γ-aminopropyltriethoxysilane, and anhydrous ethanol is 10 g: 50-100 mL: 3-6 g: 50-100 mL.

8. The method for preparing a flame-retardant and wear-resistant high-voltage cable according to claim 1, characterized in that: The flame-retardant and wear-resistant sheath pipe comprises the following raw materials in parts by weight: 100g of polypropylene, 20-50g of functional additives, 5-10g of plasticizers, 0.5-1.5g of lubricants, and 0.1-0.5g of antioxidants.

9. The method for preparing a flame-retardant and wear-resistant high-voltage cable according to claim 1, characterized in that: The method for preparing the high voltage cable comprises the following steps: B1: Multiple conductors are twisted to obtain a conductor core, and a conductive shielding layer, an insulating layer and an insulating shielding layer are extruded from the inside to the outside of the conductor core in a three-layer co-extrusion manner to obtain a cable insulated core; B2: The cable insulation core is wrapped with a water-blocking layer, and then a metal sheath layer is wrapped outside the water-blocking layer, and finally a polyolefin sheath layer is wrapped on the outer surface of the metal sheath layer to obtain a high-voltage cable.

10. A flame-retardant and wear-resistant high-voltage cable, characterized in that: Prepared by the preparation method described in any one of claims 1 to 9.

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