A flexible antioxidant and fireproof high-voltage cable

Abstract

The present invention discloses a flexible antioxidant fireproof high-voltage cable, which is characterized by comprising a flexible anti-fold grille (3) with multiple compartments, a flame-retardant filler (4), a conductor, a heat-insulating layer (5), an anti-fold sleeve (6), a flame-retardant layer (10), a rubber protective sleeve (9), and a terylene cloth antioxidant layer (8). The process of the present invention is simple, with high production efficiency. The obtained flexible antioxidant fireproof high-voltage cable has strong anti-fold property, antioxidant property, and strong fire resistance. Through the cooperation of the arranged flexible anti-fold grille, flame-retardant filler, heat-insulating layer, anti-fold sleeve, flame-retardant layer, and terylene cloth antioxidant layer, the anti-fold property of the fireproof high-voltage cable is effectively improved, the flame-retardant grade reaches Class A, and the antioxidant property is achieved, which well solves the problems of easy aging of the surface layer of the existing fireproof high-voltage cable, poor overall anti-fold property, low flame-retardant grade, and short service life.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage cables, and specifically refers to a flexible antioxidant and fireproof high-voltage cable. Background Art

[0002] Fireproof cables are fireproof cables that are widely used at present. They mainly include two categories: UL series flame-retardant cables and flame-retardant low-smoke and halogen-free cables. Mineral fireproof cables are a widely used type of flame-retardant low-smoke and halogen-free cables. Mineral fireproof cables are composed of copper stranded wires, mineral compound insulation, and mineral compound sheaths. They have the characteristics of fire resistance, large current-carrying capacity, resistance to impact voltage, resistance to mechanical damage, halogen-free and non-toxic, explosion-proof, waterproof, corrosion-resistant, long service life, safety, overload resistance, high temperature resistance, and low cost.

[0003] At present, most of the fireproof cables used in China have a flame-retardant grade of B1, and can continuously supply power for 90 minutes (E90) at 950°C - 1000°C. They have poor antioxidant properties, and their service life is mostly 30 years, and generally need to be replaced after more than 20 years. The new national standard for the use of high-voltage cables is that the service life of wire and cable should not be less than 70 years, and the flame-retardant grade should reach B or A. It can be seen that the existing high-voltage fireproof cables in China still have problems of poor high temperature resistance, flame retardancy, and antioxidant properties, resulting in poor service life of high-voltage cables. Therefore, we need to develop a high-voltage fireproof cable with better flame retardancy and high temperature resistance and a service life of more than 70 years. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of existing high-voltage fireproof cables, which have poor high temperature resistance, flame retardancy, and antioxidant properties, and provides a flexible antioxidant and fireproof high-voltage cable.

[0005] The purpose of the present invention is achieved through the following technical solutions: A flexible antioxidant and fireproof high-voltage cable includes a flexible anti-fold grille with multiple compartments, a flame-retardant filler filled in the multiple compartments of the flexible anti-fold grille, a conductor embedded in the flame-retardant filler, a heat-insulating layer extruded on the flame-retardant filler, an anti-fold sleeve extruded on the heat-insulating layer, a flame-retardant layer sleeved on the anti-fold sleeve, a rubber protective sleeve extruded on the flame-retardant layer, and a terylene fabric antioxidant layer that is embedded in the surface layer of the rubber protective sleeve by a melting and extrusion method; a flexible adhesive non-curing rubber material is also filled between the anti-fold sleeve and the flame-retardant layer.

[0006] As a further solution of the present invention, the flame-retardant layer is a composite of basalt mesh cloth, inorganic adhesive, ceramic composite tape, and graphene powder. The weight ratio of basalt mesh cloth, inorganic adhesive, ceramic composite tape, and graphene powder is 2:5.5:3:45; among them, the basalt mesh cloth is soaked with a flame retardant.

[0007] As a further aspect of the present invention, the flame retardant filler is a composite of basalt powder, alumina powder, phenol-4-sulfonic acid, and butyl acetate, and the alumina powder is nano-alumina powder with an average particle size (nm) of 18±5, a melting point of 2060°C - 2080°C, and a relative density (water = 1): 2.97 - 3.0.

[0008] To enhance the folding resistance performance of the folding-resistant sleeve, a number of elastic steel bars are embedded in the sleeve body of the folding-resistant sleeve, and the number of elastic steel bars is evenly distributed on the folding-resistant sleeve.

[0009] As a further aspect of the present invention, the flexible folding-resistant grid is made of magnesium crystal magnesium oxychloride material, and the flexible folding-resistant grid includes a grid core column and a number of grid plates evenly arranged on the grid core column; there is a gap between adjacent two of the number of grid plates, and the flame retardant filler and the conductor are located in this gap.

[0010] As a further aspect of the present invention, the conductor includes a core and a core insulating sleeve sleeved on the core; the flame retardant filler is wrapped on the core insulating sleeve.

[0011] The polyester cloth antioxidant layer is a non-textured cloth formed by melt spinning and rolling of modified PET resin, and the polyester cloth antioxidant layer is soaked in silicone oil before use.

[0012] As a further aspect of the present invention, the flexible adhesive non-curing rubber compound is a composite of butyl rubber, ethylene propylene diene monomer, wollastonite powder, and solvent oil, wherein the weight ratio of butyl rubber, ethylene propylene diene monomer, wollastonite powder, and solvent oil is: 15: 3.5: 8: 1.5.

[0013] As a further aspect of the present invention, the rubber protective sleeve is a composite of rubber hydrocarbon, CaSO4 whiskers, and antioxidant and ultraviolet light resistant masterbatch; wherein, the antioxidant and ultraviolet light resistant masterbatch is a functional masterbatch containing antioxidant and ultraviolet light absorber with PE resin as the carrier; the weight ratio of rubber hydrocarbon, CaSO4 whiskers, and antioxidant and ultraviolet light resistant masterbatch is 35: 6: 12.

[0014] In addition, the heat insulation layer is a nano heat insulation aerogel sleeve, and the nano heat insulation aerogel sleeve is a composite of black colloid and zirconia ceramics formed by hot melting.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] (1) The process of the present invention is simple and has high production efficiency. The obtained soft antioxidant and fireproof high-voltage cable has strong folding resistance, antioxidant property, and strong fireproof performance. By the cooperation of the flexible folding-resistant grid, flame-retardant filler, heat-insulating layer, folding-resistant sleeve, flame-retardant layer, and polyester cloth antioxidant layer provided in the present invention, the folding resistance of the fireproof high-voltage cable is effectively improved, the flame-retardant grade reaches Class A, and the antioxidant property is achieved, which well solves the problems of easy aging of the surface layer of the existing fireproof high-voltage cable, poor overall folding resistance, low flame-retardant grade, and short service life.

[0017] (2) In the present invention, the modified PET resin is formed by rolling after blowing, and the non-textured cloth soaked in silicone oil is used as the polyester cloth antioxidant layer, which can make the surface oxidation rate of the fireproof high-voltage cable < 8%, the heat shrinkage rate < 10%, and the heat loss ≤ 3%. It effectively reduces the overall thermal expansion rate and oxidation rate of the fireproof high-voltage cable, improves the overall service life of the fireproof high-voltage cable, and enables the service life of the fireproof high-voltage cable to reach about 70 years.

[0018] (3) The rubber protective sleeve synthesized by the rubber hydrocarbon, CaSO4 whiskers, and antioxidant and anti-ultraviolet masterbatch provided in the present invention can effectively improve the flame-retardant property and antioxidant property of the fireproof high-voltage cable, and well improve the service life of the fireproof high-voltage cable.

[0019] (4) The flexible bonding non-curing rubber compound synthesized by butyl rubber, ethylene propylene diene monomer, wollastonite powder, and solvent oil is used as the adhesive material between the folding-resistant sleeve and the flame-retardant layer in the present invention, which can effectively improve the waterproof property and flame-retardant property of the fireproof high-voltage cable.

[0020] (5) By setting a number of elastic steel bars on the folding-resistant sleeve in the present invention, the folding resistance of the fireproof high-voltage cable can be effectively improved.

[0021] (6) The nano heat-insulating aerogel sleeve synthesized by hot melting the black colloid and zirconia ceramics is used as the heat-insulating layer in the present invention, so that when the flexible folding-resistant grid, conductor, and flame-retardant filler in the fireproof high-voltage cable are burning, they can be at a low temperature or the reference temperature, ensuring the integrity of the flexible folding-resistant grid, conductor, and flame-retardant filler.

[0022] (7) The flexible folding-resistant grid provided in the present invention effectively separates the conductors, effectively improves the overall folding resistance of the fireproof high-voltage cable, and at the same time ensures the insulation between the conductors. At the same time, the conductors are wrapped by the flame-retardant filler synthesized by basalt powder, alumina powder, phenol-4-sulfonic acid, and butyl acetate, so that the conductors still have good fireproof performance even when they lose the outer protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 It is a schematic cross-sectional view of the present invention.

[0025] In the above-mentioned drawings, the component names corresponding to the reference numerals are as follows:

[0026] 1 - conductor core, 2 - conductor core insulating sleeve, 3 - flexible anti-flexure grid, 301 - grid core column, 302 - grid plate, 4 - flame retardant filler, 5 - heat insulation layer, 6 - anti-flexure sleeve, 7 - elastic steel strip, 8 - polyester cloth antioxidant layer, 9 - rubber protection sleeve, 10 - flame retardant layer, 11 - flexible adhesive non-curing rubber compound. Specific embodiments

[0027] The present invention will be further described in detail below in conjunction with embodiments, but the embodiments of the present invention are not limited thereto.

[0028] As Figure 1 and Figure 2 shown, a soft antioxidant and fireproof high-voltage cable in this embodiment includes a flexible anti-flexure grid 3, a flame retardant filler 4, a conductor, a heat insulation layer 5, an anti-flexure sleeve 6, a flame retardant layer 10, a rubber protection sleeve 9, and a polyester cloth antioxidant layer 8. Specifically, the flexible anti-flexure grid 3 has a plurality of partition cavities, and the number of its partition cavities can be set according to the number of conductors required in actual production. The flexible anti-flexure grid 3 is made of magnesium crystal magnesium oxide material, and its ignition point is 600 °C. The flexible anti-flexure grid 3 includes a grid core column 301 and a grid plate 302. Among them, the number of grid plates 302 is several, and several grid plates 302 are evenly distributed on the grid core column 301, and the grid plate 302 and the grid core column 301 are integrally formed. There is a gap between two adjacent grid plates 302 among several grid plates 302, and the flame retardant filler 4 and the conductor are located in this gap. When in use, the flexible anti-flexure grid 3 effectively separates the conductors, effectively improves the overall anti-flexure performance of the fireproof high-voltage cable, and at the same time ensures the insulation between the conductors.

[0029] Among them, the flame retardant filler 4 is filled in the partition cavities of the flexible anti-flexure grid 3. The flame retardant filler 4 is a composite of basalt powder, alumina powder, phenol-4-sulfonic acid, and butyl acetate. Specifically, during production, the alumina powder is nano-alumina powder with an average particle size (nm) of 18 ± 5, a melting point of 2060 °C - 2080 °C, and a relative density (water = 1): 2.97 - 3.0. The conductor is embedded in the flame retardant filler 4, and the conductor includes a conductor core 1 and a conductor core insulating sleeve 2 sleeved on the conductor core 1. The flame retardant filler 4 is wrapped on the conductor core insulating sleeve 2. The flame retardant filler 4 wraps the conductor, so that the conductor can still have good fireproof performance even when the outer layer protection is lost.

[0030] Further, the heat insulation layer 5 is extruded over the flame retardant filler. The heat insulation layer 5 is a nano heat insulation aerogel sleeve, which is a composite of black colloid and zirconia ceramics formed by hot melting. When the flexible folding-resistant grid 3, the conductor, and the flame retardant filler 4 are in the fire-resistant high-voltage cable during combustion, they can be at a low temperature or the reference temperature, ensuring the integrity of the flexible folding-resistant grid 3, the conductor, and the flame retardant filler 4. The folding-resistant sleeve 6 is extruded over the heat insulation layer 5. In order to improve the folding resistance of the folding-resistant sleeve 6, a number of elastic steel bars 7 are embedded in the sleeve body of the folding-resistant sleeve 6, and the number of elastic steel bars 7 is evenly distributed on the folding-resistant sleeve 6. During specific production, the elastic steel bars 7 are embedded in the folding-resistant sleeve 6 by improving the hot pressing technology, so that the elastic steel bars 7 and the folding-resistant sleeve 6 are integrated, thereby greatly improving the overall folding resistance of the fire-resistant high-voltage cable.

[0031] At the same time, the flame retardant layer 10 is sleeved over the folding-resistant sleeve 6, and a flexible adhesive non-curing rubber compound 11 is filled between the folding-resistant sleeve 6 and the flame retardant layer 10. During production, the flexible adhesive non-curing rubber compound 11 is first melted and extruded onto the folding-resistant sleeve 6 through a mold, and then the flame retardant layer 10 is sleeved over the folding-resistant sleeve 6 by a forming machine, so that the flame retardant layer 10 is fixed to the folding-resistant sleeve 6 through the flexible adhesive non-curing rubber compound 11. Among them, the flexible adhesive non-curing rubber compound 11 is a composite of butyl rubber, ethylene propylene diene monomer, wollastonite powder, and solvent oil. During specific production, the weight ratio of butyl rubber, ethylene propylene diene monomer, wollastonite powder, and solvent oil is: 15: 3.5: 8: 1.5. The flame retardant layer 10 is a composite of basalt mesh cloth, inorganic adhesive, ceramic composite tape, and graphene powder, and the weight ratio of the basalt mesh cloth, inorganic adhesive, ceramic composite tape, and graphene powder is 2: 5.5: 3: 45; among them, the basalt mesh cloth is soaked with a flame retardant. During use, the flame retardant layer 10 and the folding-resistant sleeve 6 are bonded through the flexible adhesive non-curing rubber compound 11, which can effectively improve the waterproofness and flame retardancy of the fire-resistant high-voltage cable.

[0032] Still further, the rubber protective sleeve 9 is extruded over the flame retardant layer 10. Among them, the rubber protective sleeve 10 is a composite of rubber hydrocarbon, CaSO4 whiskers, and antioxidant and ultraviolet resistant masterbatch; among them, the antioxidant and ultraviolet resistant masterbatch is a functional masterbatch containing antioxidant and ultraviolet absorber with PE resin as the carrier; the weight ratio of the rubber hydrocarbon, CaSO4 whiskers, and antioxidant and ultraviolet resistant masterbatch is 35: 6: 12. During use, the rubber protective sleeve 10 can effectively improve the flame retardancy and antioxidant performance of the fire-resistant high-voltage cable, and greatly improve the service life of the fire-resistant high-voltage cable.

[0033] Furthermore, the polyester fabric antioxidant layer 8 is embedded in the surface layer of the rubber protective sleeve 9 by melt extrusion. The polyester fabric antioxidant layer 8 is a non-textured fabric formed by melt spinning and rolling of modified PET resin, and the polyester fabric antioxidant layer 8 is soaked in silicone oil before use to improve the antioxidant ability of the polyester fabric antioxidant layer 8. Specifically, during production, the polyester fabric antioxidant layer 8 is first statically soaked in a silicone oil container for 1 to 3 days, and then the polyester fabric antioxidant layer 8 is fished out and naturally dried. Then, the dried polyester fabric antioxidant layer 8 is wrapped on the surface layer of the rubber protective sleeve 9 by melt extrusion. Under the action of the polyester fabric antioxidant layer 8, the overall thermal expansion rate and oxidation rate of the fireproof high-voltage cable can be effectively reduced, and the overall service life of the fireproof high-voltage cable can be improved, so that the service life of the fireproof high-voltage cable can reach about 70 years.

[0034] The soft antioxidant fireproof high-voltage cable prepared by the present invention has strong folding resistance, antioxidant property, and strong fire resistance. Among them, through the cooperation of the flexible folding-resistant grid 3, the flame retardant filler 4, the heat insulation layer 5, the folding-resistant sleeve 6, the flame retardant layer 10, and the polyester fabric antioxidant layer 8, the folding resistance of the fireproof high-voltage cable is effectively improved, and the flame retardant grade reaches Class A, and the antioxidant property, which well solves the problems of easy aging of the surface layer of the existing fireproof high-voltage cable, poor overall folding resistance, low flame retardant grade, and short service life.

[0035] As described above, the present invention can be well realized.

Claims

1. A flexible antioxidant and fireproof high-voltage cable, characterized in that, It includes a flexible fold-resistant grid (3) with multiple cavities, a flame-retardant filler (4) filled in the multiple cavities of the flexible fold-resistant grid (3), a conductor embedded in the flame-retardant filler (4), a heat-insulating layer (5) extruded on the flame-retardant filler (4), a fold-resistant sleeve (6) extruded on the heat-insulating layer (5), a flame-retardant layer (10) sleeved on the fold-resistant sleeve (6), a rubber protective sleeve (9) extruded on the flame-retardant layer (10), and a polyester fabric antioxidant layer (8) embedded in the surface layer of the rubber protective sleeve (9) by melt extrusion; a flexible adhesive non-curing rubber compound (11) is also filled between the fold-resistant sleeve (6) and the flame-retardant layer (10); the flame-retardant filler (4) is a composite of basalt powder, alumina powder, phenol-4-sulfonic acid, and butyl acetate, and the alumina powder is nano-alumina powder with an average particle size of 18±5 nm, a melting point of 2060°C - 2080°C, and a relative density of 2.97 - 3.0; the flexible fold-resistant grid (3) is made of magnesium crystal magnesium oxychloride material, and the flexible fold-resistant grid (3) includes a grid core cylinder (301) and a number of grid plates (302) evenly distributed on the grid core cylinder (301); there is a gap between adjacent two of the number of grid plates (302), and the flame-retardant filler and the conductor are located in this gap; the flexible adhesive non-curing rubber compound (11) is a composite of butyl rubber, ethylene propylene diene monomer, wollastonite powder, and solvent oil, and the weight ratio of butyl rubber, ethylene propylene diene monomer, wollastonite powder, and solvent oil is: 15:3.5:8:1.5; the rubber protective sleeve (9) is a composite of rubber hydrocarbon, CaSO4 whiskers, and antioxidant and ultraviolet-resistant masterbatch; among them, the antioxidant and ultraviolet-resistant masterbatch is a functional masterbatch containing antioxidant and ultraviolet absorber with PE resin as the carrier; the weight ratio of rubber hydrocarbon, CaSO4 whiskers, and antioxidant and ultraviolet-resistant masterbatch is 35:6:12; the heat-insulating layer (5) is a nano heat-insulating aerogel sleeve, and the nano heat-insulating aerogel sleeve is a composite of black colloid and zirconia ceramics formed by hot melt molding.

2. The flexible antioxidant and fireproof high-voltage cable according to claim 1, wherein: The flame-retardant layer (10) is a composite of basalt mesh cloth, inorganic adhesive, ceramic composite tape, and graphene powder, and the weight ratio of basalt mesh cloth, inorganic adhesive, ceramic composite tape, and graphene powder is 2:5.5:3:45; among them, the basalt mesh cloth is soaked with a flame retardant.

3. The flexible antioxidant and fireproof high-voltage cable according to claim 2, characterized in that: A number of elastic steel bars (7) are embedded on the sleeve body of the fold-resistant sleeve (6), and the number of elastic steel bars (7) are evenly distributed on the fold-resistant sleeve (6).

4. The flexible antioxidant and fireproof high-voltage cable according to claim 3, characterized in that: The conductor includes a conductor core (1) and a conductor core insulating sleeve (2) sleeved on the conductor core (1); the flame-retardant filler is wrapped on the conductor core insulating sleeve (2).

5. The flexible antioxidant and fireproof high-voltage cable according to claim 4, characterized in that: The polyester fabric antioxidant layer (8) is a non-textured cloth formed by melt blowing and rolling of modified PET resin, and the polyester fabric antioxidant layer (8) is soaked with silicone oil before use.

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