Ultra–high-temperature-resistant fluoroelastomer material and marine medium-voltage super fire-resistant cable comprising same

Abstract

Disclosed are an ultra–high-temperature-resistant fluoroelastomer material, and a marine medium-voltage super fire-resistant cable comprising same, comprising: 100 parts of fluoroelastomer; 15 parts of carbon black; 3 parts of a peroxide curing agent; 4 parts of an auxiliary crosslinking agent; 3-5 parts of an acid acceptor; 1-2 parts of an auxiliary acid acceptor; 5 parts of a filler; and 2-6 parts of a processing aid. The fluoroelastomer comprises a first fluoroelastomer and a second fluoroelastomer, the first fluoroelastomer and the second fluoroelastomer both being configred as terpolymer fluoroelastomers. The first fluoroelastomer has a fluorine content greater than or equal to 70%, and the second fluoroelastomer has a fluorine content of 60%-65%. The peroxide curing agent is diphenylethane peroxide. The fluoroelastomer comprises the first fluoroelastomer and the second fluoroelastomer, the first fluoroelastomer having a fluorine content greater than or equal to 70% and the second fluoroelastomer having a fluorine content of 65%-70%. Mixing the two fluoroelastomers can improve mechanical properties while ensuring heat resistance, and compared with using only high-fluorine-content fluoroelastomer, the cost is more economical.

Description

Super high-temperature-resistant fluororubber material and marine medium-voltage super fire-resistant cable with same TECHNICAL FIELD

[0001] The present application relates to material preparation, and in particular to a super high-temperature-resistant fluororubber material and a marine medium-voltage super fire-resistant cable with same. BACKGROUND

[0002] With the continuous increase in the design tonnage of ships and offshore platforms, the power consumption also increases. In order to meet the requirements of high-power power transmission, the voltage grade of the main line cable is increased from 1.8 / 3 kV and below to 3.6 / 6 kV and above. In order to meet the fire requirements of ships and offshore platforms, the cables with rated voltage of 3.6 / 6 kV and above in special areas are required to have fire resistance.

[0003] Since the voltage grade of the fire-resistant cable is increased from 1.8 / 3 kV and below to 3.6 / 6 kV and above, the conventional insulation material cannot meet the fire resistance requirements under high voltage. The conventional insulation material is usually polyethylene material, but the voltage grade of the medium-voltage cable is above 3.6 / 6 kV, and the ordinary polyethylene material cannot withstand high-voltage electric field. Therefore, a super high-temperature-resistant material is needed to meet the fire resistance requirements of the medium-voltage cable. SUMMARY

[0004] The present application overcomes the shortcomings of the prior art and provides a super high-temperature-resistant fluororubber material and a marine medium-voltage super fire-resistant cable with same.

[0005] To achieve the above-mentioned purpose, in a first aspect, the technical solution provided by the present application is: a super high-temperature-resistant fluororubber material, comprising:

[0006] The fluororubber comprises first fluororubber and second fluororubber, the fraction of the first fluororubber is greater than or equal to 1.5 times the fraction of the second fluororubber, the first fluororubber and the second fluororubber are both set as ternary fluororubber, the fluorine content of the first fluororubber is greater than or equal to 70%, and the fluorine content of the second fluororubber is set as 60%-65%.

[0007] The peroxide vulcanizing agent is set as diphenyl ethane peroxide.

[0008] Further specifically, the fluorine content of the first fluororubber is set as 70%, and the fluorine content of the second fluororubber is set as 65%.

[0009] Further specifically, the first fluororubber is set as 80 parts, and the second fluororubber is set as 20 parts.

[0010] Further specifically, the first fluororubber is set as 70 parts, and the second fluororubber is set as 30 parts.

[0011] Further, the acid absorbent is set as light magnesium oxide.

[0012] Further, the filler is set as silicon dioxide.

[0013] Further, the auxiliary acid absorbent is set as calcium carbonate, and the auxiliary cross-linking agent is set as allyl isocyanurate.

[0014] Further, the processing aid is set as polyethylene wax and machine oil.

[0015] In the second aspect of the present application, the present application provides a marine medium-voltage super-fireproof cable, comprising a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a thermal insulation layer, an armor layer and an outer sheath are sequentially arranged on the outer periphery of the conductor, and the insulation layer is set as the super-fireproof fluororubber material described above.

[0016] Further, the thermal insulation layer is set as ceramicized polyolefin.

[0017] Further, the conductor, the conductor shielding layer, the insulation layer, the insulation shielding layer and the metal shielding layer are sequentially arranged to form a core unit, and a plurality of the core units are twisted into a cable core, and a bulged glass fiber rope is filled in the cable core. Advantages

[0018] The present application solves the defects in the background art, and has the following advantages:

[0019] In the present application, the fluororubber comprises a first fluororubber and a second fluororubber, the fluorine content of the first fluororubber is greater than or equal to 70%, and the fluorine content of the second fluororubber is set to 65%-70%, the mixing of the two kinds of fluororubber can improve the mechanical properties while ensuring the heat resistance, and the cost is more economical compared with using high fluorine content fluororubber. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described below in combination with the drawings and examples;

[0021] Fig. 1 is a schematic view of the cross-sectional structure of the cable of the present application;

[0022] In the figure: 1, conductor; 2, conductor shielding layer; 3, insulation layer; 4, insulation shielding layer; 5, metal shielding layer; 6, bulged glass fiber rope filling; 7, non-woven fabric tape; 8, thermal insulation layer; 9, armor layer; 10, outer sheath. DETAILED DESCRIPTION

[0023] For the purposes of making the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings of the embodiments of the present application. In the drawings, identical or similar reference numerals represent identical or similar elements or elements having identical or similar functions throughout. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0024] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0025] It should be understood that the drawings are only used to exemplarily illustrate the present application.

[0026] The present application will now be further described in detail with reference to the drawings and embodiments, which are all simplified schematic diagrams and only schematically show the basic structure of the present application, and therefore only show the configurations related to the present application.

[0027] A super-high-temperature-resistant fluororubber material, comprising: fluororubber 100 parts; carbon black 15 parts; peroxide vulcanizing agent 3 parts; co-crosslinking agent 4 parts; acid absorber 3-5 parts; auxiliary acid absorber 1-2 parts; filler 5 parts; processing aid 2-4 parts; further, the fluororubber comprises first fluororubber and second fluororubber, wherein the first fluororubber is provided with 80 parts, and the second fluororubber is provided with 20 parts.

[0028] Another embodiment, for example, the cable is radiated at the corner, and the softness of the cable needs to be higher, so the formula is fine-tuned:

[0029] The application discloses a super high-temperature-resistant fluororubber material, which comprises the following components: 100 parts of fluororubber, 10 parts of carbon black, 3 parts of peroxide vulcanizing agent, 4 parts of auxiliary crosslinking agent, 3-5 parts of acid absorbent, 1-2 parts of auxiliary acid absorbent, 3 parts of filling agent, 4-6 parts of processing aid, and 1-2 parts of optional softening agent.

[0030] The fluororubber comprises first fluororubber and second fluororubber, the proportion of the first fluororubber is greater than or equal to 1.5 times of the proportion of the second fluororubber, the fluorine content of the first fluororubber is greater than or equal to 70%, and the fluorine content of the second fluororubber is 60%-65%.

[0031] The fluororubber with different fluorine contents can bring different performance advantages, especially in the aspects of chemical medium resistance, heat resistance and mechanical strength.

[0032] The low-fluorine-content fluororubber has good mechanical properties such as tensile strength and tear strength, good compression permanent deformation performance, and relatively low cost.

[0033] The medium-fluorine-content fluororubber has good high-temperature resistance and is suitable for use at high temperatures.

[0034] The high-fluorine-content fluororubber has excellent high-temperature resistance and is suitable for use in extremely high-temperature environments.

[0035] Therefore, the formula of the present solution uses 80 parts of the first fluororubber with a fluorine content of 70% and 20 parts of the second fluororubber with a fluorine content of 65%. In the present solution, the first fluororubber and the second fluororubber are set as ternary fluororubber. The ratio of the present solution can improve the mechanical properties while ensuring the heat resistance, and the cost is more economical compared to using high-fluorine-content fluororubber entirely.

[0036] In the preparation of the material, the heat resistance of the material is preferentially ensured. The higher the fluorine content of the fluororubber, the better the heat resistance. Although the performance of the fluororubber with a fluorine content of 70% is better, it is relatively harder and more expensive. The use of a part of fluororubber with a fluorine content of 65% can also achieve this heat resistance. The softness of the material after mixing the two fluororubbers with different fluorine contents is better than that of the material with 70% fluororubber. Hard material cannot be bent during cabling and laying, which affects the use of the cable. At the same time, the processing performance of the material is considered. High-fluorine-content fluororubber is more difficult to process, such as requiring higher processing temperature, while low-fluorine-content fluororubber is easier to process. By mixing the two, the overall processing performance of the material can be improved.

[0037] The performance of the two fluororubbers mixed in the present solution is compared with other materials on the market:

[0038] As shown in the above table, while ensuring good tensile strength and meeting the heat resistance requirements, the use of fluororubber with a fluorine content of 70% is more expensive and has higher hardness, and the use of fluororubber with a fluorine content of 65% is not enough for heat resistance. Therefore, the two are mixed to ensure high-temperature resistance. At the same time, the larger the Shore hardness, the more difficult it is to bend after the cable is made, which affects the use of the cable.

[0039] The vulcanization system of the present solution uses a more efficient combination of vulcanizing agent and accelerator. A peroxide vulcanization system is used because peroxide vulcanization can provide better high-temperature stability. Specifically, the peroxide vulcanizing agent is set as diphenyl ethane peroxide.

[0040] The acid absorber is set as light magnesium oxide. Increasing the amount of acid absorber can improve the vulcanization quality and thus improve the heat resistance. Therefore, the light magnesium oxide is set to 3-5 parts, and the optimal weight is 5 parts.

[0041] The filler is set as silica. High-purity and high-dispersibility silica can improve the heat resistance of the vulcanized rubber.

[0042] The auxiliary crosslinking agent is set as allyl isocyanurate. The auxiliary acid absorption agent is set as calcium carbonate. The processing aid is set as polyethylene wax and machine oil, the polyethylene wax is set 1-2 parts, the machine oil is set 1-2 parts, and the machine oil is set as naphthenic oil.

[0043] A production and processing process of an ultra-high temperature-resistant fluororubber material is specifically as follows:

[0044] First, the first fluororubber and the second fluororubber are preliminarily mixed in a mixer, then carbon black, diphenyl ethane peroxide, allyl isocyanurate, light magnesium oxide, calcium carbonate, polyethylene wax and machine oil are added, and full mixing is carried out until all components are uniformly dispersed.

[0045] Subsequently, the mixed rubber is transferred to an open mill for thin passing to further improve the uniformity of mixing and to remove air. After thin passing is completed, the rubber is placed for 24 hours for storage to allow various components to interact better.

[0046] Next, the stored rubber is extruded into the required shape using an extruder, and the extrusion temperature is controlled at 100-140℃. Finally, the extruded semi-finished product is placed in a vulcanizing furnace for vulcanization treatment, the vulcanization temperature is set at 170-200℃, and the vulcanization time is determined according to the thickness and shape of the product, generally 30 minutes to several hours. After vulcanization is completed, the product is cooled, washed, inspected, etc. to complete the production process of insulation.

[0047] A marine medium-voltage super-fire-resistant cable, as shown in FIG. 1, includes a conductor 1, a conductor shielding layer 2 is extruded around the outer periphery of the conductor 1, an insulation layer 3 is extruded around the outer periphery of the conductor shielding layer 2, and an insulation shielding layer 4 is extruded around the outer periphery of the insulation layer 3 to form an insulated core; a metal shielding layer 5 is braided around the outer periphery of the insulated core to form a core unit, a plurality of core units are twisted into a cable core, a non-woven fabric tape 7 is wrapped around the twisted core units, a bulking glass fiber rope filler 6 is arranged in the gap of the cable core, a thermal insulation layer 8 is extruded around the outer periphery of the cable core, an armor layer 9 is braided around the outer periphery of the thermal insulation layer 8, and a crosslinked outer sheath 10 is arranged around the outer periphery of the armor layer 9.

[0048] The conductor 1 adopts the fifth type of tinned conductor specified in IEC 60228 standard, which is twisted by a plurality of tinned filaments, the diameters of each tinned filament are the same, and the diameters of the tinned filaments are set as needed, but the diameter of the tinned filament is not less than 0.4mm. The fifth type of tinned conductor has good softness, and the finished cable product produced by using it is easy to bend, which can reduce the difficulty of cable installation and laying and reduce the possibility of cable breakage.

[0049] The conductor 1 outer periphery adopts 150+100+60 three-layer co-extrusion continuous vulcanization production line to simultaneously extrude the conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 to form an insulating core. The conductor shielding layer 2 is set as a semi-conductive conductor shielding layer, the insulating shielding layer 4 is set as a semi-conductive insulating shielding layer, the material of the insulating layer 3 adopts super high-temperature resistant fluororubber, and the super high-temperature resistant fluororubber material has super heat-resistant insulation performance below 260 DEG C.

[0050] The metal shielding layer 5 is set as a tinned copper wire braid, the metal shielding layer 5 is braided on the outer periphery of the insulating core to form a cable core, and the tinned copper wire is set as several, the diameters of the several tinned copper wires are the same, the diameter of each tinned copper wire is set as 0.2 mm, and the braiding density of the several tinned copper wires is greater than or equal to 80%.

[0051] The cable core is set as several insulating cores stranded, and further specifically, the cable core is set as three insulating cores stranded. In the process of stranding the three insulating cores, a layer of non-woven fabric tape 7 is wrapped around the outer periphery of the three insulating cores, the thickness of the non-woven fabric is set as 0.2 mm, and the covering rate is set as 15%-20%. The stranding of the cable core will form a gap in the middle. If the gap is retained, it will affect the strength and fire resistance of the cable, and it is easy to be extruded and deformed, and the phenomenon of uniform breakdown of electric field occurs. Therefore, the expanded glass fiber rope 6 is set to fill the gap. Of course, ordinary glass fiber rope can also be filled in the gap, but it may cause hand pricking during use. Therefore, in this scheme, the glass fiber rope is an expanded glass fiber rope prepared by expansion treatment. The preparation of the expanded glass fiber rope mainly includes fiber forming, fiber plying and expansion treatment.

[0052] The heat insulation layer 8 is set as a low-smoke halogen-free ceramicized polyolefin material, and the low-smoke halogen-free ceramicized polyolefin material is extruded by an extruder.

[0053] The armored layer 9 is set as a tinned copper wire braided armored layer, the tinned copper wire is set as several, the diameters of the several tinned copper wires are the same, the diameter of each tinned copper wire is set as 0.4 mm, and the braiding density is greater than or equal to 80%.

[0054] The outer sheath 10 is set as an irradiation cross-linked low-smoke halogen-free sheath, and the material of the irradiation cross-linked low-smoke halogen-free sheath is extruded by an extruder.

[0055] Because the outer diameter of the medium voltage cable is large, the electrons are vertically emitted from directly above the cable, and the sheath molecular chain is cross-linked by the electron effect, which causes the sheath directly above the cable to be affected by the electron effect to be higher than the sheath directly below the cable, and uneven irradiation occurs. In order to ensure uniform irradiation of the cable, a reflecting magnet is installed below the cable, a strong magnetic field is used to change the direction of electron movement, and the outer sheath 10 of the cable is uniformly affected by the electron effect, so as to ensure the consistency of the performance of the outer sheath 10 of the cable.

[0056] A preparation process of a marine medium voltage super fire-resistant cable is as follows:

[0057] A plurality of tin-plated single filaments are twisted into a conductor 1, and then the conductor shield layer 2, the insulation layer 3 and the insulation shield layer 4 are successively extruded from close to the conductor 1 to far from the conductor 1 through a production line, the conductor shield layer 2 and the insulation shield layer 4 are both set as semi-conductive shielding materials, the insulation layer 3 is set as super high-temperature resistant fluororubber material to ensure the fire resistance of the cable, and the conductor 1, the conductor shield layer, the insulation layer 3 and the insulation shield layer 4 are closely arranged with each other to form an insulated core.

[0058] A metal shielding layer 5 is woven on the outer periphery of the insulated core to form a core unit, and the metal shielding layer 5 is set as tin-plated copper wire weaving. Then, three core units with the same structural performance are twisted to form a cable core, and a layer of non-woven fabric is wrapped around the outer periphery of the three core units during the twisting process. After the wrapping of the non-woven fabric is completed, a gap will be formed in the cable core. In order to reduce the deformation of the cable caused by extrusion, expanded glass fiber rope is filled in the gap.

[0059] After the filling of the expanded glass fiber rope is completed, a thermal insulation layer 8 is extruded on the outer periphery of the cable core, the thermal insulation layer 8 is set as low-smoke halogen-free ceramic polyolefin material, and after the extrusion of the thermal insulation layer 8 is completed, an armor layer 9 is arranged on the outer periphery of the thermal insulation layer 8, the armor layer 9 is also set as tin-plated copper wire weaving, but the diameter of the tin-plated copper wire of the armor layer 9 is larger than that of the metal shielding layer 5. After the arrangement of the armor layer 9 is completed, an outer sheath 10 is extruded on the outer periphery of the armor layer 9, the outer sheath 10 adopts irradiation cross-linked low-smoke halogen-free outer sheath 10, and a reflecting magnet is additionally arranged during the irradiation cross-linking process to ensure the consistency of the performance of the outer sheath 10.

[0060] When the cable is connected to a voltage of 6kV, the whole cable can withstand flame combustion of 830℃ for 120min without short circuit and continuous operation.

[0061] The ceramic polyolefin is sintered into porcelain in 3-5 minutes under the flame of 830 DEG C, and a dense heat-resistant oxygen barrier layer is formed, so that it is difficult for external heat to be transmitted to the inside of the cable, and meanwhile, the insulating layer and the filling layer of the wrapping material ensure the high-temperature resistance requirement, and the high dielectric constant and high heat resistance of the internal fluororubber material ensure normal operation under high temperature and high voltage, so that the overall cable can be normally operated for 120 minutes under the high-temperature flame of 830 DEG C without short circuit and open circuit.

[0062] The present application solves the defects in the background art and has the following beneficial effects:

[0063] In the present solution, the fluororubber includes first fluororubber and second fluororubber, the fluorine content of the first fluororubber is greater than or equal to 70%, and the fluorine content of the second fluororubber is set to 65%-70%, the mixing of the two kinds of fluororubber can ensure the heat resistance while improving the mechanical properties, and the cost is more economical compared with using high fluorine content fluororubber; the insulating layer 3 of the cable involves super high temperature resistant fluororubber, the super high temperature resistant fluororubber has excellent insulation and heat resistance; the filling material uses expanded glass fiber rope to tightly fill the cable core, avoiding the decomposition of conventional filling materials under high temperature to generate voids, and the deformation of the insulation under the extrusion force, and the uniform breakdown of the electric field, and at the same time, the glass fiber rope is treated by expansion to soften the texture of the glass fiber, avoiding the problem of hand scratching during use; the heat insulation layer 8 material uses ceramic polyolefin, which can form a tight heat insulation layer 8 above 500 DEG C, effectively isolating the heat outside the cable core, ensuring the integrity of the insulation to meet the normal power transmission under fire conditions.

[0064] The above is based on the ideal embodiment of the present application, and through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the present application. The technical scope of the present application is not limited to the contents in the specification, and must be determined according to the scope of claims.

[0065] The preferred embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, and these simple modifications all belong to the protection scope of the present application.

[0066] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present application will not further describe various possible combinations.

[0067] Furthermore, the various embodiments of the present application can be combined with each other, as long as it does not violate the spirit of the present application, and it should be considered as disclosed in the present application.

Claims

1. An ultra-high temperature resistant fluoroelastomer material, characterized in that: comprising: The fluororubber includes a first fluororubber and a second fluororubber, the first fluororubber is greater than or equal to 1.5 times of the second fluororubber, the first fluororubber and the second fluororubber are both ternary fluororubber, the fluorine content of the first fluororubber is greater than or equal to 70%, and the fluorine content of the second fluororubber is 60%-65%. The peroxide vulcanizing agent is diphenyl ethane peroxide.

2. The ultra-high temperature fluoroelastomer material of claim 1, wherein: The fluorine content of the first fluororubber is 70%, and the fluorine content of the second fluororubber is 65%.

3. The ultra-high temperature fluoroelastomer material of claim 1, wherein: The first fluororubber is 80 parts, and the second fluororubber is 20 parts.

4. The ultra-high temperature fluoroelastomer material of claim 1, wherein: The first fluororubber is 70 parts, and the second fluororubber is 30 parts.

5. The ultra-high temperature fluoroelastomer material of claim 1, wherein: The acid absorbent is light magnesium oxide, and the filler is silicon dioxide.

6. The ultra-high temperature fluoroelastomer material of claim 1, wherein: The auxiliary acid absorbent is calcium carbonate, and the auxiliary crosslinking agent is allyl isocyanurate.

7. The ultra-high temperature fluoroelastomer material of claim 1, wherein: The processing aid is polyethylene wax and machine oil.

8. A marine medium voltage super fire resistant cable characterized in that: The conductor (1) is provided with a conductor shielding layer (2), an insulation layer (3), an insulation shielding layer (4), a metal shielding layer (5), a heat insulation layer (8), an armored layer (9) and an outer sheath (10) in sequence, and the insulation layer (3) is made of the super-high-temperature-resistant fluororubber material in any one of claims 1-7.

9. The marine medium voltage super fire survival cable according to claim 1, characterized in that: The heat insulation layer (8) is ceramicized polyolefin.

10. A marine medium voltage super fire survival cable according to claim 1, characterized in that: The conductor (1), the conductor shielding layer (2), the insulation layer (3), the insulation shielding layer (4) and the metal shielding layer (5) are sequentially provided to form a wire core unit, a plurality of wire core units are twisted into a cable core, and the cable core is filled with an expanded glass fiber rope.

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