High-temperature-resistant weather-resistant shielding control cable

Abstract

The invention relates to the technical field of cables, and provides a high-temperature-resistant and weather-resistant shielding control cable which sequentially comprises a conductor, an insulating layer, a shielding layer and an outer sheath layer from inside to outside. The outer sheath layer comprises the following components in parts by weight: 90 parts of polyvinyl chloride, 8-16 parts of high-density polyethylene, 10-18 parts of MQ silicon resin, 4-8 parts of a vinyl chloride-vinyl acetate copolymer, 8-16 parts of bauxite, 0.3-0.4 part of an antioxidant and 1-2 parts of a plasticizer; the MQ silicon resin comprises vinyl MQ silicon resin and methyl MQ silicon resin in a weight ratio of (1-9): 1. According to the technical scheme, the problem of poor high temperature resistance of the outer sheath layer of the shielding control cable in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and specifically, to a high-temperature and weather-resistant shielded control cable. Background Art

[0002] A shielded control cable is a cable used to transmit control, measurement signals, etc., and is widely used in long-distance operation, control, and signal transmission scenarios in industrial and mining enterprises, energy and transportation departments, modern high-rise buildings, and other fields. A shielded control cable usually consists of a basic conductor layer, an insulating layer, a shielding layer, and an outer sheath layer. The conductor layer is generally made of metal materials such as copper or aluminum, and is mainly used to transmit electrical signals; the insulating layer usually uses insulating materials such as high-voltage polyethylene, fluoroplastics, and silicone rubber to isolate the conductor from the outside world, prevent electric leakage and short circuits, and at the same time play a certain insulating and protective role; outside the insulating layer, there is a shielding layer made of materials such as copper tape, copper wire, aluminum foil, conductive cloth, or braided copper mesh. Its function is to isolate the electromagnetic field noise source from sensitive devices, cut off the propagation path of the noise source, prevent interference signals from entering the inner conductor, reduce the loss of transmitted signals, and prevent internal signals from radiating out to interfere with other devices; the outermost layer is usually the outer sheath layer, and its main function is to protect the internal structure of the cable from the influence of the external environment, such as mechanical damage, water intrusion, chemical corrosion, etc., and improve the safety of the cable.

[0003] The outer sheath layer is located on the outermost layer of the cable. Although it does not directly contact the conductor, it can protect the internal insulating layer, shielding layer, and other structures of the cable from the influence of the external high-temperature environment. However, currently, a large amount of high-temperature resistant additives (metal oxides, ceramic powders, etc.) are usually added to the outer sheath layer of the shielded control cable to achieve the purpose of high temperature resistance. Although it can meet the requirements of the high-temperature environment to a certain extent, due to the addition of a large amount of high-temperature resistant additives, the extrusion process is more difficult and the internal non-uniformity increases, resulting in limited improvement in the high-temperature resistance of the outer sheath layer and a decrease in the stability of the cable.

[0004] Based on this, how to improve the high-temperature resistance of the outer sheath layer of the shielded control cable without relying on a large amount of addition of high-temperature resistant additives is a technical problem that needs to be solved urgently at present. Summary of the Invention

[0005] The present invention provides a high-temperature and weather-resistant shielded control cable, which solves the problem of poor high-temperature resistance of the outer sheath layer of the shielded control cable in the related art.

[0006] The technical solution of the present invention is as follows: The present invention provides a high-temperature and weather-resistant shielded control cable, which sequentially includes a conductor, an insulating layer, a shielding layer, and an outer sheath layer from inside to outside. The outer sheath layer includes the following components in parts by weight: 90 parts of polyvinyl chloride, 8 - 16 parts of high - density polyethylene, 10 - 18 parts of MQ silicone resin, 4 - 8 parts of vinyl chloride - vinyl acetate copolymer, 8 - 16 parts of bauxite, 0.3 - 0.4 parts of antioxidant, 1 - 2 parts of plasticizer; The MQ silicone resin includes vinyl MQ silicone resin and methyl MQ silicone resin with a weight ratio of 1 - 9:1.

[0007] In the present invention, the shielded control cable is composed of a conductor, an insulating layer, a shielding layer and an outer sheath layer. Among them, the outer sheath layer is based on polyvinyl chloride, which endows the outer sheath layer with basic processing properties and can provide basic protection for the cable. The high - density polyethylene is used in combination with polyvinyl chloride, increasing the flexibility of the outer sheath layer, making the cable easy to operate during stretching and not prone to cracking problems.

[0008] In the present invention, polyvinyl chloride is a polymer formed by the free - radical polymerization of vinyl chloride monomers under initiators such as peroxides and azo compounds, or under the action of light and heat. Polyvinyl chloride can be regarded as the result of one hydrogen atom in each monomer unit of the polyethylene molecular chain being alternately replaced by a chlorine atom. The presence of chlorine increases the gravitational force between molecular chains, making the polyvinyl chloride polymer have basic mechanical properties. The polyvinyl chloride can be polyvinyl chloride KCH - 15, polyvinyl chloride NI00 - 50, polyvinyl chloride S - 700, polyvinyl chloride PR - G, polyvinyl chloride S - 80, and preferably polyvinyl chloride NI00 - 50.

[0009] In the present invention, high - density polyethylene is a polymer synthesized from ethylene monomers under low - pressure or medium - pressure and certain temperature conditions. The symmetry and regularity of its molecular chain endow high - density polyethylene with good chemical stability and processing properties. The high - density polyethylene can be high - density polyethylene TR - 144, high - density polyethylene DMDA - 8920, high - density polyethylene DMDA - 6147, high - density polyethylene TR571 - H, and preferably high - density polyethylene DMDA - 8008H.

[0010] In the present invention, bauxite is a mineral containing refractory clay. It has a relatively high hardness itself. In the cable outer sheath layer, it can effectively flame - retard while also being used as a filler, which can improve the overall mechanical strength of the cable outer sheath layer, enabling it to better withstand external tensile forces and extend the service life of the cable.

[0011] As a further technical solution, the weight ratio of the vinyl MQ silicone resin to the methyl MQ silicone resin is 2 - 5:1.

[0012] In the present invention, when the weight ratio of vinyl MQ silicone resin to methyl MQ silicone resin is 2-5:1, by using vinyl MQ silicone resin, methyl MQ silicone resin and vinyl chloride-vinyl acetate copolymer in combination, the high temperature resistance of the outer sheath layer of the shielded control cable can be further improved, so that the thermal stability time of the outer sheath layer at 200 °C is increased to 272-279 min. When the weight ratio of vinyl MQ silicone resin to methyl MQ silicone resin is outside the range of 2-5:1, the thermal stability time of the outer sheath layer at 200 °C is lower and the high temperature resistance is poorer.

[0013] As a further technical solution, the vinyl content in the vinyl MQ silicone resin is 0.5 wt% - 1.5 wt%.

[0014] As a further technical solution, the bauxite is a hydroxybiphenyl compound composite bauxite, and the raw materials of the hydroxybiphenyl compound composite bauxite include bauxite and hydroxybiphenyl compound with a weight ratio of 20:1 - 4.

[0015] In the present invention, using hydroxybiphenyl compound to compound bauxite can improve the tensile strength of the outer sheath layer of the shielded control cable. The possible reason is that after the bauxite is treated with hydroxybiphenyl compound, the interfacial bonding with the polyvinyl chloride substrate is enhanced, which can improve the tensile strength of the outer sheath layer of the shielded control cable.

[0016] In the present invention, the hydroxybiphenyl compound can be 4,4'-dihydroxybiphenyl, p-phenylphenol, or a mixture of 4,4'-dihydroxybiphenyl and p-phenylphenol with a weight ratio of 1:9 - 4:1, preferably a mixture of 4,4'-dihydroxybiphenyl and p-phenylphenol with a weight ratio of 1 - 3:1.

[0017] As a further technical solution, the average particle size of the bauxite is 10 - 80 μm, which can be 10 μm, 20 μm, 40 μm, 45 μm, 50 μm, 60 μm, 70 μm, 80 μm, preferably 45 μm.

[0018] As a further technical solution, the preparation method of the hydroxybiphenyl compound composite bauxite includes the following steps: A1. Mix the bauxite and an alkali solution, ball mill, and dry to obtain a pre-treated bauxite product; A2. Dissolve the hydroxybiphenyl compound in ethanol, add the pre-treated bauxite product, mix evenly, concentrate, and dry to obtain the hydroxybiphenyl compound composite bauxite.

[0019] In the present invention, after the bauxite is pretreated with a solution, the activity and contact area of the bauxite can be increased, thereby improving the compounding effect of the hydroxybiphenyl compound on the bauxite.

[0020] As a further technical solution, in step A1, the weight ratio of the bauxite to the alkali solution is 20:7 to 10, which can be 20:7, 20:8, 20:9, 20:10; The alkali solution includes one or more of an aqueous sodium hydroxide solution, an aqueous sodium bicarbonate solution, and an aqueous potassium hydroxide solution; When ball milling, the rotation speed is 400 - 500 rpm and the time is 20 - 30 min.

[0021] As a further technical solution, the mass fraction of the alkali solution is 10% - 15%, which can be 10%, 11%, 12%, 12.5%, 13%, 14%, 15%, and preferably 12%.

[0022] As a further technical solution, in step A2, when mixing evenly, the rotation speed is 600 - 700 rpm and the time is 45 - 75 min.

[0023] As a further technical solution, the material of the conductor is one of copper alloy and aluminum alloy; The insulating layer is a polyvinyl chloride insulating layer; The shielding layer is a copper wire braided shielding layer.

[0024] In the present invention, the conductor is made of copper alloy or aluminum alloy. Copper alloy or aluminum alloy has excellent electrical conductivity and can effectively transmit current. At the same time, compared with pure copper or pure aluminum, copper alloy and aluminum alloy have higher strength and toughness, and can withstand a certain amount of external force impact without affecting the electrical conductivity; When the insulating layer is a polyvinyl chloride insulating layer, polyvinyl chloride has a high resistivity, can effectively prevent current leakage, isolate the conductor from the external environment, and ensure good electrical insulation performance of the cable. At the same time, the polyvinyl chloride insulating layer can match the base material of the outer sheath layer, and the inner insulating layer and the outer sheath layer can form a more compact structure, improving the overall performance and reliability of the shielded control cable; When the shielding layer is a copper wire braided shielding layer, the copper wire braided shielding layer can reflect external electromagnetic interference signals, prevent them from entering the cable interior and affecting the signal transmission in the conductor. In addition, the copper wire braided shielding layer also has a certain strength and toughness, which can provide additional mechanical protection for the cable.

[0025] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, antioxidant 1076, and antioxidant 300.

[0026] In the present invention, the oxidation reaction makes the outer sheath layer material of the cable brittle and hard, thereby reducing its mechanical strength and flexibility. The antioxidant can capture the free radicals generated in the cable insulation material, prevent or slow down the progress of the oxidation chain reaction, thereby inhibiting the oxidation of the outer sheath layer material of the cable, enabling the cable to maintain good tensile strength during long-term use, ensuring that the cable is not easily damaged during installation and use. At the same time, the antioxidant can improve the thermal stability of the outer sheath layer of the cable, enabling it to still maintain good performance at relatively high temperatures, avoiding material failure caused by thermal oxidation, and thus increasing the service life of the cable in a high-temperature environment. The antioxidant includes one or more of antioxidant 1010, antioxidant 168, antioxidant 1076, and antioxidant 300, preferably antioxidant 1010.

[0027] As a further technical solution, the plasticizer includes one or more of dioctyl adipate, dibutyl phthalate, and dioctyl sebacate.

[0028] In the present invention, the addition of the plasticizer can weaken the intermolecular forces between the polymer molecular chains in the outer sheath layer, increase the mobility of the molecular chains, enable polyvinyl chloride and other components to melt at relatively low temperatures, reduce processing energy consumption, and improve production efficiency. The plasticizer includes one or more of dioctyl adipate, dibutyl phthalate, and dioctyl sebacate, preferably dibutyl phthalate.

[0029] The present invention also provides a method for preparing a high-temperature and weather-resistant shielded control cable for preparing the high-temperature and weather-resistant shielded control cable, including the following steps: S1. Extrude and coat the insulating layer around the conductor to form a conductor coated with an insulating layer; S2. Wrap the shielding layer around the conductor coated with the insulating layer to form a cable semi-finished product; S3. Blend the components of the outer sheath layer and extrude and coat them around the cable semi-finished product to obtain a shielded control cable.

[0030] The working principle and beneficial effects of the present invention are as follows: In the present invention, MQ silicone resin is a special type of silicone resin composed of monofunctional siloxane linkages and tetrafunctional siloxane linkages. MQ silicone resin includes vinyl MQ silicone resin and methyl MQ silicone resin. The presence of vinyl chloride-vinyl acetate copolymer can promote the contact of vinyl MQ silicone resin and methyl MQ silicone resin with other molecules. In a high-temperature environment, the three act together to form a thermally stable system with a moderate density inside, significantly improving the high-temperature resistance of the outer sheath layer of the shielded control cable without using a large amount of bauxite. Specific embodiments

[0031] 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.

[0032] In the following examples and comparative examples, the type of polyvinyl chloride is NI00-50; the type of high-density polyethylene is DMDA-8008H; the type of vinyl MQ silicone resin is 5202P, purchased from Shenzhen Jipeng Silicon Fluoride Materials Co., Ltd.; the type of methyl MQ silicone resin is BM-803; the type of vinyl chloride-vinyl acetate copolymer is LC-201; the average particle size of bauxite is 45 μm; the type of methylphenyl silicone resin is JP-LNU3040, purchased from Jining Tangyi Chemical Co., Ltd.; the material of the conductor is copper alloy, and the model is MF202.

[0033] Example 1 A high-temperature and weather-resistant shielded control cable, comprising the following steps: S1. Extrude and coat a polyvinyl chloride insulating layer around the copper alloy conductor to form a copper alloy conductor coated with a polyvinyl chloride insulating layer; S2. Wrap a copper wire braided shielding layer around the copper alloy conductor coated with a polyvinyl chloride insulating layer to form a cable semi-finished product; S3. Blend 90 parts of polyvinyl chloride, 8 parts of high-density polyethylene, 5 parts of vinyl MQ silicone resin, 5 parts of methyl MQ silicone resin, 4 parts of vinyl chloride-vinyl acetate copolymer, 8 parts of bauxite, 0.3 part of antioxidant 1010, and 1 part of dibutyl phthalate, and extrude and coat them around the cable semi-finished product to obtain a shielded control cable.

[0034] Example 2 A high-temperature and weather-resistant shielded control cable, comprising the following steps: S1. Extrude and coat a polyvinyl chloride insulating layer around the copper alloy conductor to form a copper alloy conductor coated with a polyvinyl chloride insulating layer; S2. Wrap a copper wire braided shielding layer around the copper alloy conductor coated with a polyvinyl chloride insulating layer to form a cable semi-finished product; S3. Blend 90 parts of polyvinyl chloride, 12 parts of high-density polyethylene, 6 parts of vinyl MQ silicone resin, 6 parts of methyl MQ silicone resin, 6 parts of vinyl chloride-vinyl acetate copolymer, 12 parts of bauxite, 0.35 part of antioxidant 1010, and 1.5 parts of dibutyl phthalate, and extrude and coat them around the cable semi-finished product to obtain a shielded control cable.

[0035] Example 3 A high-temperature and weather-resistant shielded control cable, comprising the following steps: S1. Extrude and coat a polyvinyl chloride insulation layer around the periphery of a copper alloy conductor to form a copper alloy conductor coated with a polyvinyl chloride insulation layer; S2. Wrap a copper wire braided shielding layer around the periphery of the copper alloy conductor coated with a polyvinyl chloride insulation layer to form a semi-finished cable; S3. Blend 90 parts of polyvinyl chloride, 16 parts of high-density polyethylene, 16.2 parts of vinyl MQ silicone resin, 1.8 parts of methyl MQ silicone resin, 8 parts of vinyl chloride-vinyl acetate copolymer, 16 parts of bauxite, 0.4 part of antioxidant 1010, and 2 parts of dibutyl phthalate, and extrude and coat them around the periphery of the semi-finished cable to obtain a shielded control cable.

[0036] Example 4 The difference between this example and Example 2 is only that, in this example, the addition amount of vinyl MQ silicone resin is 10.8 parts, and the addition amount of methyl MQ silicone resin is 1.2 parts.

[0037] Example 5 The difference between this example and Example 2 is only that, in this example, the addition amount of vinyl MQ silicone resin is 10 parts, and the addition amount of methyl MQ silicone resin is 2 parts.

[0038] Example 6 The difference between this example and Example 2 is only that, in this example, the addition amount of vinyl MQ silicone resin is 8 parts, and the addition amount of methyl MQ silicone resin is 4 parts.

[0039] Example 7 The difference between this example and Example 6 is only that, in this example, the bauxite is a hydroxybiphenyl compound composite bauxite, and the preparation method of the hydroxybiphenyl compound composite bauxite includes the following steps: A1. Mix 20 parts of bauxite and 7 parts of an aqueous sodium bicarbonate solution with a mass fraction of 12%, ball mill at 400 rpm for 30 min, and dry to obtain a pre-treated bauxite; A2. Dissolve 0.5 part of 4,4'-dihydroxybiphenyl and 0.5 part of p-phenylphenol in 40 parts of ethanol, then add the above-mentioned pre-treated bauxite, and stir at 600 rpm for 75 min in a stirring manner to mix evenly, concentrate, and dry to obtain a hydroxybiphenyl compound composite bauxite; A high-temperature and weather-resistant shielded control cable, including the following steps: S1. Extrude and coat a polyvinyl chloride insulation layer around the periphery of a copper alloy conductor to form a copper alloy conductor coated with a polyvinyl chloride insulation layer; S2. Wrap a copper wire braided shielding layer around the periphery of the copper alloy conductor coated with a polyvinyl chloride insulation layer to form a semi-finished cable; S3. Mix 90 parts of polyvinyl chloride, 12 parts of high-density polyethylene, 8 parts of vinyl MQ silicone resin, 4 parts of methyl MQ silicone resin, 6 parts of vinyl chloride-vinyl acetate copolymer, 12 parts of hydroxybiphenyl compound composite bauxite, 0.35 part of antioxidant 1010, and 1.5 parts of dibutyl phthalate, and extrude and coat the mixture around the semi-finished cable to obtain a shielded control cable.

[0040] Example 8 The difference between this example and Example 7 is only that in this example, the preparation method of the hydroxybiphenyl compound composite bauxite is different, and its preparation method includes the following steps: A1. Mix 20 parts of bauxite and 10 parts of an aqueous sodium bicarbonate solution with a mass fraction of 12%, ball mill at 500 rpm for 20 min, and dry to obtain a pre-treated bauxite product. A2. Dissolve 2 parts of 4,4'-dihydroxybiphenyl and 2 parts of p-phenylphenol in 40 parts of ethanol, add the above-mentioned pre-treated bauxite product, and stir at 700 rpm for 45 min in a stirring manner to mix evenly, concentrate, and dry to obtain a hydroxybiphenyl compound composite bauxite.

[0041] Example 9 The difference between this example and Example 8 is only that in the preparation process of the hydroxybiphenyl compound composite bauxite in this example, the addition amount of 4,4'-dihydroxybiphenyl is 3 parts and the addition amount of p-phenylphenol is 1 part.

[0042] Example 10 A high-temperature and weather-resistant shielded control cable, including the following steps: S1. Extrude and coat a polyvinyl chloride insulating layer around the copper alloy conductor to form a copper alloy conductor coated with a polyvinyl chloride insulating layer. S2. Wrap a copper wire braided shielding layer around the copper alloy conductor coated with a polyvinyl chloride insulating layer to form a semi-finished cable. S3. Mix 90 parts of polyvinyl chloride, 12 parts of high-density polyethylene, 8 parts of vinyl MQ silicone resin, 4 parts of methyl MQ silicone resin, 6 parts of vinyl chloride-vinyl acetate copolymer, 10 parts of bauxite, 1.5 parts of 4,4'-dihydroxybiphenyl, 0.5 part of p-phenylphenol, 0.35 part of antioxidant 1010, and 1.5 parts of dibutyl phthalate, and extrude and coat the mixture around the semi-finished cable to obtain a shielded control cable.

[0043] Comparative Example 1 The difference between this comparative example and Example 1 is only that in this comparative example, the vinyl MQ silicone resin is replaced with an equal amount of methyl MQ silicone resin.

[0044] Comparative Example 2 The difference between this comparative example and Example 1 is only that in this comparative example, the methyl MQ silicone resin is replaced with an equal amount of vinyl MQ silicone resin.

[0045] Comparative Example 3 The difference between this comparative example and Example 1 is only that in this comparative example, the vinyl MQ silicone resin and the methyl MQ silicone resin are replaced with an equal amount of methylphenyl silicone resin.

[0046] Comparative Example 4 The difference between this comparative example and Example 1 is only that in this comparative example, neither the vinyl MQ silicone resin nor the methyl MQ silicone resin is added, and 14 parts of vinyl chloride-vinyl acetate copolymer are added.

[0047] Comparative Example 5 The difference between this comparative example and Example 1 is only that in this comparative example, the vinyl chloride-vinyl acetate copolymer is not added, 7 parts of vinyl MQ silicone resin are added, and 7 parts of methyl MQ silicone resin are added.

[0048] Comparative Example 6 The difference between this comparative example and Example 1 is only that in this comparative example, the vinyl chloride-vinyl acetate copolymer is replaced with an equal amount of ethylene-vinyl acetate copolymer.

[0049] Experimental Example 1 Three specimens were cut from the outer sheath layers of the shielded control cables prepared in Examples 1 to 6 and Comparative Examples 1 to 6. The specimen size was 30 mm in length and 3 mm in thickness. According to the method in GB / T 2951.32-2008 "General test methods for insulating and sheathing materials of cables and optical cables - Part 32: Special test methods for polyvinyl chloride compounds - Weight loss test - Thermal stability test", the thermal stability time of the outer sheath layer specimens was tested at 200 °C. The result was the average value of the three specimens, and the test results are shown in Table 1.

[0050] Table 1 Test results of the high-temperature resistance performance of the outer sheath layer

[0051] It can be seen from Table 1 that compared with Comparative Examples 1 to 6, the thermal stability time of the outer sheath layer of the shielded control cables in Examples 1 to 6 at 200 °C was significantly improved, indicating that the MQ silicone resin includes vinyl MQ silicone resin and methyl MQ silicone resin. By using the combination of vinyl chloride-vinyl acetate copolymer, vinyl MQ silicone resin and methyl MQ silicone resin, the high-temperature resistance performance of the outer sheath layer of the shielded control cable can be significantly improved.

[0052] Experimental Example 2 Three specimens were cut from the outer sheath layer of the shielded control cables prepared in Examples 6 to 10, and dumbbell specimens with a thickness of 2 mm were prepared according to the method in GB / T 2951.11-2008 "General test methods for insulating and sheathing materials of cables and optical cables - Part 11: General test methods - Measurement of thickness and overall dimensions, Mechanical properties test", and the tensile strength was tested. The test results are shown in Table 2.

[0053] Table 2 Tensile strength test results of the outer sheath layer

[0054] Compared with Example 6 and Example 10, the tensile strength of the outer sheath layer of the shielded control cables in Examples 7 to 9 is increased, indicating that the tensile strength of the outer sheath layer of the shielded control cables can be improved by using the hydroxybiphenyl compound to compound-treat bauxite.

[0055] 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 in the protection scope of the present invention.

Claims

1. A high temperature and weather resistant shielded control cable, comprising a conductor, an insulating layer, a shielding layer and an outer sheath layer from the inside to the outside, characterized in that: The outer sheath layer comprises the following components in parts by weight: 90 parts of polyvinyl chloride, 8-16 parts of high-density polyethylene, 10-18 parts of MQ silicone resin, 4-8 parts of vinyl chloride-vinyl acetate copolymer, 8-16 parts of bauxite, 0.3-0.4 parts of antioxidant, 1-2 parts of plasticizer; The MQ silicone resin includes vinyl MQ silicone resin and methyl MQ silicone resin in a weight ratio of 1 to 9:

1.

2. A high temperature and weather resistant shielded control cable according to claim 1, characterized in that: The weight ratio of the vinyl MQ silicone resin to the methyl MQ silicone resin is 2-5:

1.

3. The high temperature and weather resistant shielded control cable according to claim 1, characterized in that: The bauxite is composite bauxite containing hydroxybiphenyl compounds, and the raw materials of the composite bauxite containing hydroxybiphenyl compounds include bauxite and hydroxybiphenyl compounds in a weight ratio of 20:1-4.

4. A high temperature and weather resistant shielded control cable according to claim 3, characterized in that: The hydroxybiphenyl compound comprises 4,4'-dihydroxybiphenyl and p-phenylphenol in a weight ratio of 1 to 3:

1.

5. The high temperature and weather resistant shielded control cable according to claim 3, characterized in that: The preparation method of the composite bauxite containing hydroxybiphenyl compound comprises the following steps: A1, mixing the bauxite and an alkaline solution, ball milling, and drying to obtain a bauxite pre-treated product; A2. After dissolving the hydroxybiphenyl compound in ethanol, add the bauxite pre-treated material, mix evenly, concentrate, and dry to obtain a hydroxybiphenyl compound-containing composite bauxite.

6. A high temperature and weather resistant shielded control cable according to claim 5, characterized in that: In step A1, the weight ratio of bauxite to alkaline solution is 20:7-10; The alkaline solution includes one or more of a sodium hydroxide aqueous solution, a sodium bicarbonate aqueous solution, and a potassium hydroxide aqueous solution; During the ball milling, the rotation speed is 400-500 rpm and the time is 20-30 min.

7. The high temperature and weather resistant shielded control cable according to claim 5, characterized in that: In step A2, when the mixing is uniform, the rotation speed is 600-700 rpm and the time is 45-75 min.

8. The high temperature and weather resistant shielded control cable according to claim 1, characterized in that: The conductor is made of copper alloy or aluminum alloy. The insulating layer is a polyvinyl chloride insulating layer; The shielding layer is a copper wire braided shielding layer.

9. The high temperature and weather resistant shielded control cable according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant 1010 , antioxidant 168 , antioxidant 1076 , and antioxidant 300 .

10. The high temperature and weather resistant shielded control cable according to claim 1, characterized in that: The plasticizer includes one or more of dioctyl adipate, dibutyl phthalate, and dioctyl sebacate.

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