A waterproof, corrosion-resistant floating cable

Abstract

The present invention relates to the technical field of floating cables, and provides a waterproof and corrosion-resistant floating cable, which comprises a conductor, an insulating layer, a foaming layer, and a sheath layer from inside to outside. The raw materials of the sheath layer include the following components in parts by mass: 90-110 parts of styrene-butadiene-styrene block copolymer, 60-80 parts of polypropylene, 80-90 parts of white oil, 15-25 parts of filler, 2-3 parts of antioxidant, 1-2 parts of compatibilizer, and 1-3 parts of dispersant; the filler is composite calcium carbonate; the preparation method of the composite calcium carbonate comprises the following steps: A1. Adding calcium carbonate into an alkali solution, mixing evenly to obtain a mixed solution; A2. Adding magnesium chloride and aluminum chloride into water, mixing to obtain a metal salt mixed solution; A3. Adding the metal salt mixed solution into the mixed solution, stirring, centrifuging, washing, and drying to obtain the composite calcium carbonate. Through the above technical solution, the problem of poor acid and corrosion resistance of the waterproof floating cable in the related art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of floating cables, and specifically, to a waterproof and corrosion-resistant floating cable. Background Art

[0002] In the fields of ocean resource development and energy transmission, the waterproof floating cable, as the core carrier connecting underwater equipment and land systems, directly affects the operation efficiency and safety with its performance. With the increasing trend of global ocean acidification (such as in industrial wastewater discharge areas and waters around acidic oil and gas fields), the durability problem of waterproof floating cables in acidic environments has become more prominent. Traditional materials are difficult to resist the erosion of acidic media, resulting in frequent failures such as sheath layer rupture and insulation failure, and there is an urgent need to break through the technical bottleneck through material innovation and process optimization.

[0003] In recent years, there have been more new research results on acid-resistant corrosion materials. The synergy of new fluorocarbon polymers (such as polytetrafluoroethylene) and silane-modified polyurethane coatings can reduce the acid solution penetration rate by more than 90%. Bio-based materials (such as composites of polylactic acid and montmorillonite) can achieve self-repair of microcracks through ester bond hydrolysis in acidic environments, extending the service life. Although these new materials have made breakthroughs in the acid-resistant field, the high density of fluorocarbon polymers will lead to insufficient buoyancy, and the silane-modified polyurethane coating may reduce the flexibility of the cable under long-term seawater immersion; the self-repair mechanism of bio-based materials has limited effects in dynamic marine environments, so they cannot be directly applied to the field of waterproof floating cables for the time being.

[0004] In view of the limited acid-resistant corrosion ability of existing waterproof floating cables, it is of crucial significance to develop a waterproof and corrosion-resistant floating cable with good acid-resistant corrosion ability. Summary of the Invention

[0005] The present invention provides a waterproof and corrosion-resistant floating cable, which solves the problem of poor acid-resistant corrosion of waterproof floating cables in related technologies.

[0006] The technical solution of the present invention is as follows:

[0007] The present invention provides a waterproof and corrosion-resistant floating cable, which includes a conductor, an insulating layer, a foaming layer, and a sheath layer from the inside to the outside. The raw materials of the sheath layer include the following components in parts by mass: 90-110 parts of styrene-butadiene-styrene block copolymer, 60-80 parts of polypropylene, 80-90 parts of white oil, 15-25 parts of filler, 2-3 parts of antioxidant, 1-2 parts of compatibilizer, and 1-3 parts of dispersant;

[0008] The filler is composite calcium carbonate; the preparation method of the composite calcium carbonate includes the following steps:

[0009] A1. Add calcium carbonate to an alkali solution, mix evenly to obtain a mixed solution;

[0010] A2. Add magnesium chloride and aluminum chloride into water, mix them to obtain a mixed metal salt solution;

[0011] A3. Add the mixed metal salt solution into the mixed solution, stir, centrifuge, wash, and dry to obtain the composite calcium carbonate.

[0012] In the present invention, the composite calcium carbonate is prepared by the co - precipitation technique, which significantly improves the interfacial compatibility between the filler and the polymer matrix. This method in - situ generates a coating layer on the surface of calcium carbonate. After coating, the surface properties of calcium carbonate are optimized, and its compatibility with the polymer is significantly improved, inhibiting the cracking of materials caused by stress concentration. The alkaline environment of the coating layer can neutralize acidic media, adsorb and neutralize corrosive ions through surface active sites, enhancing the acid and corrosion resistance of the materials.

[0013] As a further technical solution, the alkali solution is a mixed solution of sodium hydroxide and sodium carbonate.

[0014] As a further technical solution, the molar ratio of sodium hydroxide to sodium carbonate in the mixed solution of sodium hydroxide and sodium carbonate is 3 - 5:1;

[0015] The pH value of the alkali solution is 9 - 10;

[0016] The mass - to - volume ratio of the calcium carbonate to the alkali solution is 1 g:40 - 50 mL;

[0017] The mass ratio of magnesium chloride, aluminum chloride to calcium carbonate is 3 - 4:1:15;

[0018] The mass - to - volume ratio of magnesium chloride to water is 1 g:4 - 5 mL.

[0019] In the present invention, by adjusting the mass ratio of magnesium chloride, aluminum chloride to calcium carbonate to 3 - 4:1:15, the acid and corrosion resistance of the waterproof, corrosion - resistant floating cable is further improved. The mass ratio of magnesium chloride, aluminum chloride to calcium carbonate can be 3:1:15, 3.1:1:15, 3.2:1:15, 3.3:1:15, 3.4:1:15, 3.5:1:15, 3.6:1:15, 3.7:1:15, 3.8:1:15, 3.9:1:15, 4:1:15, and is preferably 3.5:1:15.

[0020] In the present invention, by optimizing the composition of the alkali solution, the coating effect of the composite calcium carbonate is further improved. Using a mixed solution of sodium hydroxide and sodium carbonate can avoid structural defects caused by local over - alkalinity. The carbonate ions in the mixed solution enhance the acid - neutralizing ability of the material, making the coating layer thickness uniform and the coating rate high. The mass ratio of magnesium chloride, aluminum chloride to calcium carbonate is optimized, improving the comprehensive performance of the coated calcium carbonate and further enhancing the acid and corrosion resistance of the sheath layer.

[0021] As a further technical solution, during the stirring, the rotation speed is 400-500 rpm, the temperature is 50-60 °C, and the time is 5-6 h.

[0022] In the present invention, the stirring process parameters effectively improve the reaction efficiency and product performance. The rotation speed of 400-500 rpm ensures sufficient contact between the metal salt solution and the calcium carbonate particles, making the coating layer thickness uniform. The temperature control of 50-60 °C inhibits excessive grain growth. The reaction time of 5-6 h ensures complete deposition of metal ions, and the coating layer binds to the surface of calcium carbonate. The composite calcium carbonate prepared under these process parameters exhibits excellent dispersibility during the melt blending process, improving the processing stability of the filler. Under these conditions, the filler is more uniformly dispersed in the sheath matrix, and the interfacial bonding is tighter, effectively preventing the penetration of acid solution along the gaps of the filler and maintaining the material performance stability.

[0023] As a further technical solution, during the centrifugation, the rotation speed is 7000-8000 rpm, and the time is 5-10 min.

[0024] In the present invention, the centrifugation parameters ensure the product purity and performance stability. The rotation speed of 7000-8000 rpm effectively separates unreacted metal salts and impurities, reducing the residual ion concentration. The centrifugation time avoids excessive energy consumption while ensuring the separation effect, prevents moisture absorption and caking during storage, and avoids the degradation effect of alkaline residues on the polymer matrix after washing and drying, ensuring long-term storage stability. The composite calcium carbonate produced by this process has small batch-to-batch differences, ensuring the consistency of the cable product performance. Its coating effect remains stable during long-term use, improving the comprehensive performance and reliability of the material.

[0025] As a further technical solution, the composite calcium carbonate is a functionalized composite calcium carbonate;

[0026] The raw materials of the functionalized composite calcium carbonate include composite calcium carbonate and 4-bromo-3-fluorobenzoic acid with a mass ratio of 50-60:1.

[0027] In the present invention, the mass ratio of the composite calcium carbonate to 4-bromo-3-fluorobenzoic acid can be 50:1, 51:1, 52:1, 53:1, 54:1, 55:1, 56:1, 57:1, 58:1, 59:1, 60:1.

[0028] In the present invention, 4-bromo-3-fluorobenzoic acid is introduced onto the surface of the calcium carbonate composite material. A hydrophobic barrier is constructed through the low surface energy characteristics of the halogen substitution group, improving the waterproof property of the waterproof and corrosion-resistant floating cable. The composite calcium carbonate and the styrene-butadiene-styrene block copolymer matrix are enhanced in binding through the benzene ring π-π interaction, reducing interface defects and extending the water penetration path. This design not only retains the acid corrosion resistance of the composite calcium carbonate but also blocks water intrusion through hydrophobic functionalization, being particularly suitable for the long-term protection of floating cables. In addition, by adjusting the mass ratio of the calcium carbonate composite material to 4-bromo-3-fluorobenzoic acid to 50-60:1, the surface density of the hydrophobic groups is controlled. The mass ratio of 50-60:1 enables the uniform coverage of organic molecules, forming a continuous hydrophobic barrier to achieve precise regulation of waterproof property without sacrificing acid corrosion resistance.

[0029] As a further technical solution, the preparation method of the functionalized composite calcium carbonate includes the following steps:

[0030] Add the composite calcium carbonate into ethanol, add 4-bromo-3-fluorobenzoic acid, stir, concentrate, and dry to obtain the functionalized composite calcium carbonate.

[0031] As a further technical solution, in the preparation method of the functionalized composite calcium carbonate, during the stirring, the rotation speed is 200-300 rpm, the time is 1-3 h, and the temperature is 50-60 °C.

[0032] In the present invention, a composite process of low-speed stirring in an ethanol medium is adopted to ensure the uniform binding of 4-bromo-3-fluorobenzoic acid on the surface of the composite calcium carbonate. The low-speed stirring prevents damage to the coating layer. While retaining the acid corrosion resistance of the composite calcium carbonate, this preparation method introduces hydrophobic groups, enabling the material to have both high acid corrosion resistance and waterproof property. The dispersedness of the composite filler in the matrix is improved, interface defects are reduced, and the water penetration path is extended, achieving a waterproof effect.

[0033] As a further technical solution, the conductor is an aluminum conductor;

[0034] The raw materials of the insulating layer include polyvinyl chloride;

[0035] The raw materials of the foaming layer include styrene-butadiene-styrene block copolymer and 4,4'-oxybis(benzenesulfonyl hydrazide).

[0036] In the present invention, the cable adopts a four-layer structure of an aluminum conductor, a polyvinyl chloride insulation layer, a foaming layer and a sheath layer. The materials of each layer cooperate to construct a waterproof floating barrier. The density of the aluminum conductor is lower than that of the copper conductor. While ensuring the electrical conductivity, the weight of the cable is reduced, which is convenient for underwater laying. The polyvinyl chloride insulation layer has excellent electrical insulation and water resistance. Its polar structure inhibits the penetration of moisture and forms a tight bonding interface with the aluminum conductor, avoiding insulation failure caused by electrochemical corrosion. The foaming layer provides continuous floating ability and reduces the water absorption risk caused by the long-term immersion of the cable. The sheath layer ensures acid corrosion resistance and waterproof performance. This design realizes the integrated integration of floating and electrical conductivity, and is particularly suitable for the long-term reliable operation in fields such as ocean engineering.

[0037] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076.

[0038] In the present invention, the antioxidant can be any one or more conventional antioxidants, and can be one or more of antioxidant 3114, antioxidant 245, antioxidant 1098, antioxidant 1330, antioxidant 1010, antioxidant 168, and antioxidant 1076. Preferably, it is one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076.

[0039] In the present invention, the antioxidant significantly delays the oxidative degradation of the material and extends the service life of the cable through mechanisms such as capturing free radicals and decomposing peroxides. In the water environment, the antioxidant can inhibit the chain oxidation reaction caused by high temperature, ultraviolet rays and chemical media, and maintain the mechanical properties and electrical insulation of the sheath material. The antioxidant can also inhibit the crosslinking and chain scission of styrene-butadiene-styrene block copolymer and polypropylene, preventing the material from embrittlement or swelling, and ensuring that the sheath layer maintains elasticity and tightness during long-term immersion.

[0040] As a further technical solution, the compatibilizer includes one of maleic anhydride grafted polyethylene and maleic anhydride grafted polypropylene.

[0041] In the present invention, the compatibilizer can be any one or more conventional compatibilizers, and preferably, it is one of maleic anhydride grafted polyethylene and maleic anhydride grafted polypropylene.

[0042] In the present invention, the compatibilizer interacts with the filler through active groups, forms a strong interfacial bond between the polymer matrix and the filler, and significantly improves the performance of the composite material. Its amphiphilic structure anchors the filler at one end and is compatible with the non-polar matrix at the other end, enabling the filler to be uniformly dispersed in the styrene-butadiene-styrene block copolymer and polypropylene blend system. At the same time, the compatibilizer improves the melt fluidity of the blend system, promotes extrusion molding, and makes the sheath surface smoother and denser.

[0043] As a further technical solution, the dispersant includes one or more of stearic acid, liquid paraffin, and oxidized polyethylene wax.

[0044] In the present invention, the dispersant can be any one or more conventional dispersants, and can be one or more of polydimethylsiloxane, sodium dodecyl sulfate, polyethylene glycol, stearic acid, liquid paraffin, and oxidized polyethylene wax, preferably one or more of stearic acid, liquid paraffin, and oxidized polyethylene wax.

[0045] The present invention also provides a method for preparing a waterproof, corrosion-resistant, and floating cable for preparing the waterproof, corrosion-resistant, and floating cable, which includes the following steps:

[0046] S1. After kneading the raw materials of the insulating layer, extrude them onto the surface of the conductor to obtain an insulated wire.

[0047] S2. After kneading the raw materials of the foaming layer, extrude them onto the surface of the insulated wire to obtain a semi-finished cable.

[0048] S3. Add the filler, compatibilizer, and dispersant to white oil and mix them evenly to obtain a mixture.

[0049] S4. Add the styrene-butadiene-styrene block copolymer, polypropylene, and antioxidant to the mixture, knead, and extrude them onto the surface of the semi-finished cable to obtain a waterproof, corrosion-resistant, and floating cable.

[0050] In the present invention, a staged extrusion process is adopted to achieve precise control of the materials of each layer of the cable and performance coordination. After the raw materials of the insulating layer are extruded, they tightly coat the aluminum conductor. The foaming layer ensures the floating function and structural stability. In the sheath layer, the filler, compatibilizer, and dispersant are mixed in white oil. The white oil reduces the surface energy, the compatibilizer enhances the interfacial bonding effect, and the dispersant inhibits agglomeration to ensure uniform dispersion in the subsequent blending. In the multi-phase blending stage, the styrene-butadiene-styrene block copolymer, polypropylene, and the mixture form an interpenetrating network. The elastic segments of the styrene-butadiene-styrene block copolymer buffer stress, the rigid skeleton of polypropylene inhibits swelling, and the antioxidant is evenly distributed to inhibit processing oxidation and maintain material stability, achieving multi-layer protection and function coordination, ensuring long-term stable operation, and meeting the requirements of complex scenarios such as ocean engineering and underwater monitoring.

[0051] The working principle and beneficial effects of the present invention are as follows:

[0052] In the present invention, the sheath layer adopts a blend system of styrene-butadiene-styrene block copolymer and polypropylene, which has both elastic deformation ability and rigid support characteristics. The flexible segment of the styrene-butadiene-styrene block copolymer and the rigid segment of polypropylene form an interpenetrating network. White oil maintains the flexibility of the material, and the antioxidant delays aging. In the filler, calcium carbonate particles enhance the mechanical properties of the material. By forming composite calcium carbonate, the calcium carbonate is protected to prevent the sheath layer from cracking caused by the denaturation of calcium carbonate due to acid corrosion, thereby improving the acid corrosion resistance of the waterproof, corrosion-resistant and floating cable. Detailed implementation mode

[0053] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0054] In the following examples and comparative examples, the model of the styrene-butadiene-styrene block copolymer is YH-792, the model of polypropylene is Sinopec T30S, the model of maleic anhydride grafted polyethylene is Exxelor PE 1040, the model of maleic anhydride grafted polypropylene is Exxelor PO 1020, the white oil is No. 5 white oil, and the particle size of calcium carbonate is 800 mesh.

[0055] Example 1

[0056] A waterproof, corrosion-resistant and floating cable includes an aluminum conductor, an insulating layer, a foaming layer, and a sheath layer from the inside to the outside. The raw materials of the sheath layer include the following components in parts by mass: 110 parts of styrene-butadiene-styrene block copolymer, 80 parts of polypropylene, 90 parts of white oil, 25 parts of composite calcium carbonate, 3 parts of antioxidant 1010, 2 parts of maleic anhydride grafted polyethylene, and 3 parts of stearic acid;

[0057] The preparation method of the composite calcium carbonate includes the following steps:

[0058] A1. Add calcium carbonate to an alkaline solution with pH = 10 (the mass-volume ratio of calcium carbonate to the alkaline solution is 1 g:50 mL, and the molar ratio of sodium hydroxide to sodium carbonate in the alkaline solution is 5:1), and mix evenly to obtain a mixed solution;

[0059] A2. Add magnesium chloride and aluminum chloride to water (the mass ratio of magnesium chloride, aluminum chloride to calcium carbonate is 6:1:15, and the mass-volume ratio of magnesium chloride to water is 1 g:5 mL), and mix to obtain a metal salt mixed solution;

[0060] A3, adding the metal salt mixture to the mixed solution, stirring at 500 rpm at 60°C for 5 h, centrifuging at 8000 rpm for 5 min, washing, and drying to obtain composite calcium carbonate;

[0061] A method for preparing a waterproof and corrosion-resistant floating cable comprises the following steps:

[0062] S1. Mix 100 parts of polyvinyl chloride resin, 12 parts of dioctyl phthalate, 6 parts of carbon black, 1 part of antioxidant 1010, and 1.5 parts of polyethylene wax, and extrude the mixture onto the surface of a conductor to obtain an insulated wire.

[0063] S2. 100 parts of styrene-butadiene-styrene block copolymer, 3 parts of 4,4'-oxybisbenzenesulfonylhydrazide, 4 parts of dioctyl phthalate, and 14 parts of carbon black are mixed and then extruded onto the surface of the insulated wire to obtain a semi-finished cable;

[0064] S3, adding composite calcium carbonate, maleic anhydride grafted polyethylene, and stearic acid to white oil, and mixing uniformly to obtain a mixture;

[0065] S4. Add styrene-butadiene-styrene block copolymer, polypropylene and antioxidant 1010 to the mixture, mix for 15 minutes, and extrude on the surface of the cable semi-finished product to obtain a waterproof and corrosion-resistant floating cable.

[0066] Example 2

[0067] A waterproof and corrosion-resistant floating cable, comprising, from the inside out, an aluminum conductor, an insulation layer, a foam layer, and a sheath layer. The sheath layer is made of the following components in parts by weight: 90 parts of styrene-butadiene-styrene block copolymer, 60 parts of polypropylene, 80 parts of white oil, 15 parts of composite calcium carbonate, 2 parts of antioxidant 168, 1 part of maleic anhydride grafted polypropylene, and 1 part of liquid paraffin.

[0068] The preparation method of composite calcium carbonate comprises the following steps:

[0069] A1. Add calcium carbonate to an alkaline solution with a pH of 9 (the mass volume ratio of calcium carbonate to alkaline solution is 1 g:40 mL, and the molar ratio of sodium hydroxide to sodium carbonate in the alkaline solution is 3:1), mix well, and obtain a mixed solution.

[0070] A2. Add magnesium chloride and aluminum chloride to water (the mass ratio of magnesium chloride, aluminum chloride to calcium carbonate is 1:1:15, and the mass volume ratio of magnesium chloride to water is 1 g:4 mL), and mix to obtain a metal salt mixture;

[0071] A3. Add the metal salt mixture to the mixed solution, stir at 400 rpm for 6 h at 50° C., centrifuge at 7000 rpm for 10 min, wash, and dry to obtain composite calcium carbonate;

[0072] Preparation method of waterproof, corrosion-resistant and floating cable, comprising the following steps:

[0073] S1. Mix 100 parts of polyvinyl chloride resin, 12 parts of dioctyl phthalate, 6 parts of carbon black, 1 part of antioxidant 1010, and 1.5 parts of polyethylene wax, and extrude the mixture onto the surface of a conductor to obtain an insulated wire;

[0074] S2. Mix 100 parts of styrene-butadiene-styrene block copolymer, 3 parts of 4,4'-oxybisbenzenesulfonyl hydrazide, 4 parts of dioctyl phthalate, and 14 parts of carbon black, and extrude the mixture onto the surface of the insulated wire to obtain a semi-finished cable;

[0075] S3. Add compound calcium carbonate, maleic anhydride grafted polypropylene, and liquid paraffin into white oil, and mix evenly to obtain a mixture;

[0076] S4. Add styrene-butadiene-styrene block copolymer, polypropylene, and antioxidant 168 into the mixture, mix for 10 min, and extrude the mixture onto the surface of the semi-finished cable to obtain a waterproof, corrosion-resistant and floating cable.

[0077] Example 3

[0078] A waterproof, corrosion-resistant and floating cable, from inside to outside, comprises an aluminum conductor, an insulating layer, a foaming layer, and a sheath layer. The raw materials of the sheath layer include the following components in parts by mass: 100 parts of styrene-butadiene-styrene block copolymer, 70 parts of polypropylene, 85 parts of white oil, 20 parts of compound calcium carbonate, 2.5 parts of antioxidant 1076, 1.5 parts of maleic anhydride grafted polyethylene, and 2 parts of oxidized polyethylene wax;

[0079] Preparation method of compound calcium carbonate, comprising the following steps:

[0080] A1. Add calcium carbonate into an alkaline solution with pH = 9.5 (the mass-volume ratio of calcium carbonate to the alkaline solution is 1 g:45 mL, and the molar ratio of sodium hydroxide to sodium carbonate in the alkaline solution is 4:1), and mix evenly to obtain a mixed solution;

[0081] A2. Add magnesium chloride and aluminum chloride into water (the mass ratio of magnesium chloride, aluminum chloride to calcium carbonate is 5:1:15, and the mass-volume ratio of magnesium chloride to water is 1 g:4.5 mL), and mix to obtain a metal salt mixed solution;

[0082] A3. Add the metal salt mixed solution into the mixed solution, stir at 55 °C at a speed of 450 rpm for 5.5 h, centrifuge at a speed of 7500 rpm for 8 min, wash, and dry to obtain compound calcium carbonate;

[0083] Preparation method of waterproof, corrosion-resistant and floating cable, comprising the following steps:

[0084] S1. Mix 100 parts of polyvinyl chloride resin, 12 parts of dioctyl phthalate, 6 parts of carbon black, 1 part of antioxidant 1010, and 1.5 parts of polyethylene wax, and then extrude the mixture onto the surface of the conductor to obtain an insulated wire.

[0085] S2. Mix 100 parts of styrene-butadiene-styrene block copolymer, 3 parts of 4,4'-oxybisbenzenesulfonyl hydrazide, 4 parts of dioctyl phthalate, and 14 parts of carbon black, and then extrude the mixture onto the surface of the semi-finished cable to obtain a semi-finished cable.

[0086] S3. Add compound calcium carbonate, maleic anhydride grafted polyethylene, and oxidized polyethylene wax into white oil, and mix them evenly to obtain a mixture.

[0087] S4. Add styrene-butadiene-styrene block copolymer, polypropylene, and antioxidant 1076 into the mixture, mix for 15 min, and then extrude the mixture onto the surface of the semi-finished cable to obtain a waterproof, corrosion-resistant, floating cable.

[0088] Example 4

[0089] The difference between this example and Example 3 is only that the mass ratio of magnesium chloride, aluminum chloride to calcium carbonate in this example is 2:1:15.

[0090] Example 5

[0091] The difference between this example and Example 3 is only that the mass ratio of magnesium chloride, aluminum chloride to calcium carbonate in this example is 3:1:15.

[0092] Example 6

[0093] The difference between this example and Example 3 is only that the mass ratio of magnesium chloride, aluminum chloride to calcium carbonate in this example is 3.5:1:15.

[0094] Example 7

[0095] The difference between this example and Example 3 is only that the mass ratio of magnesium chloride, aluminum chloride to calcium carbonate in this example is 4:1:15.

[0096] Example 8

[0097] The difference between this example and Example 6 is only that the compound calcium carbonate in this example is replaced with functionalized compound calcium carbonate of equal mass;

[0098] The preparation method of the functionalized compound calcium carbonate includes the following steps:

[0099] Add compound calcium carbonate into ethanol, add 4-bromo-3-fluorobenzoic acid (the mass ratio of compound calcium carbonate to 4-bromo-3-fluorobenzoic acid is 60:1), stir at 60 °C at a speed of 300 rpm for 1 h, concentrate, and dry to obtain functionalized compound calcium carbonate.

[0100] Example 9

[0101] The difference between this example and Example 8 is only that the preparation method of the functionalized compound calcium carbonate in this example includes the following steps:

[0102] Add compound calcium carbonate into ethanol, add 4-bromo-3-fluorobenzoic acid (the mass ratio of compound calcium carbonate to 4-bromo-3-fluorobenzoic acid is 50:1), stir at 50 °C at a speed of 200 rpm for 3 h, concentrate, and dry to obtain functionalized compound calcium carbonate.

[0103] Comparative Example 1

[0104] The difference between this comparative example and Example 3 is only that in this comparative example, the compound calcium carbonate is replaced with an equal amount of calcium carbonate.

[0105] Experimental Example 1

[0106] Test the Shore hardness A of the sheath layers of the waterproof, corrosion-resistant and floating cables prepared in Examples 1 to 7 and Comparative Example 1 according to the method specified in GB / T 2411-2008 Plastics and Hard Rubber - Determination of Indentation Hardness by Means of a Durometer (Shore Hardness). Then soak the sheath layers in a sulfuric acid aqueous solution with a mass concentration of 30% at room temperature for 48 h, and test the Shore hardness A again. The test results are shown in Table 1.

[0107] Table 1 Test Results of Shore Hardness A

[0108]

[0109] As can be seen from Table 1, the waterproof, corrosion-resistant and floating cables prepared in Examples 1 to 7 have good acid corrosion resistance. Therefore, using compound calcium carbonate as a filler in the present invention improves the acid corrosion resistance of the waterproof, corrosion-resistant and floating cables.

[0110] Experimental Example 2

[0111] Test the water absorption of the sheath layers of the waterproof, corrosion-resistant and floating cables prepared in Examples 6 and 8 to 9 according to the method specified in GB / T 2951.13-2008 General Test Methods for Insulating and Sheathing Materials of Cables and Optical Fibre Cables - Part 13: General Test Methods - Methods for Determination of Density, Water Absorption and Shrinkage. The test conditions are: brine with a mass concentration of 7.5%, temperature of 90 °C, and time of 720 h. The test results are shown in Table 2.

[0112] Table 2 Water Absorption Test Results

[0113]

[0114] As can be seen from Table 2, the water absorption of Examples 8-9 reached 1.2 mg / cm 3 Hereinafter, therefore, 4-bromo-3-fluorobenzoic acid is used in the present invention to compound the composite calcium carbonate, improving the waterproof property of the waterproof and corrosion-resistant floating cable.

[0115] Experimental Example 3

[0116] The sheath layers of the waterproof and corrosion-resistant floating cables prepared in Examples 5-7 were tested for tensile strength according to the method specified in GB / T 1040.1-2018 "Determination of Tensile Properties of Plastics - Part 1: General Principles". The test results are shown in Table 3.

[0117] Table 3 Tensile Strength Test Results

[0118]

[0119] As can be seen from Table 3, the waterproof and corrosion-resistant floating cable prepared by the present invention can meet the usage requirements.

[0120] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A waterproof, corrosion-resistant floating cable, characterized in that, From the inside to the outside, it includes a conductor, an insulating layer, a foaming layer, and a sheath layer. The raw materials of the sheath layer include the following components in parts by mass: 90 - 110 parts of styrene-butadiene-styrene block copolymer, 60 - 80 parts of polypropylene, 80 - 90 parts of white oil, 15 - 25 parts of filler, 2 - 3 parts of antioxidant, 1 - 2 parts of compatibilizer, and 1 - 3 parts of dispersant; The filler is composite calcium carbonate; the preparation method of the composite calcium carbonate includes the following steps: A1. Add calcium carbonate to an alkali solution, mix evenly to obtain a mixed solution; A2. Add magnesium chloride and aluminum chloride to water, mix to obtain a metal salt mixed solution; A3. Add the metal salt mixed solution to the mixed solution, stir, centrifuge, wash, and dry to obtain the composite calcium carbonate; When stirring, the rotation speed is 400 - 500 rpm, the temperature is 50 - 60 °C, and the time is 5 - 6 h.

2. The waterproof, corrosion-resistant floating cable according to claim 1, characterized in that The alkali solution is a mixed solution of sodium hydroxide and sodium carbonate.

3. According to claim 2, a waterproof, corrosion-resistant and floating cable, characterized in that, In the mixed solution of sodium hydroxide and sodium carbonate, the molar ratio of sodium hydroxide to sodium carbonate is 3 - 5:1; The pH value of the alkali solution is 9 - 10; The mass-to-volume ratio of calcium carbonate to the alkali solution is 1 g:40 - 50 mL; The mass ratio of magnesium chloride, aluminum chloride to calcium carbonate is 3 - 4:1:

15.

4. A waterproof, corrosion-resistant floating cable according to claim 1, wherein, When centrifuging, the rotation speed is 7000 - 8000 rpm, and the time is 5 - 10 min.

5. A waterproof, corrosion-resistant floating cable according to claim 1, characterized in that, The composite calcium carbonate is functionalized composite calcium carbonate; The raw materials of the functionalized composite calcium carbonate include composite calcium carbonate and 4-bromo-3-fluorobenzoic acid with a mass ratio of 50 - 60:

1.

6. A waterproof, corrosion-resistant floating cable according to claim 5, characterized in that, The preparation method of the functionalized composite calcium carbonate includes the following steps: Add composite calcium carbonate to ethanol, add 4-bromo-3-fluorobenzoic acid, stir, concentrate, and dry to obtain the functionalized composite calcium carbonate.

7. A waterproof, corrosion-resistant floating cable according to claim 6, characterized in that, In the preparation method of the functionalized composite calcium carbonate, when stirring, the rotation speed is 200 - 300 rpm, the time is 1 - 3 h, and the temperature is 50 - 60 °C.

8. A waterproof, corrosion-resistant floating cable according to claim 1, characterized in that, The conductor is an aluminum conductor; The raw materials of the insulating layer include polyvinyl chloride; The raw materials of the foaming layer include styrene-butadiene-styrene block copolymer and 4,4'-oxybis(benzenesulfonyl hydrazide).

9. A waterproof, corrosion-resistant floating cable according to claim 1, characterized in that, The antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076; The compatibilizer includes one of maleic anhydride grafted polyethylene and maleic anhydride grafted polypropylene; The dispersant includes one or more of stearic acid, liquid paraffin, and oxidized polyethylene wax.

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