A high temperature and weather resistant shielded control cable

Abstract

The present invention relates to the field of cable technology and proposes a high-temperature and weather-resistant shielded control cable. The cable comprises, from the inside out, a conductor, an insulation layer, a shielding layer, and an outer sheath. The outer sheath comprises the following components by weight: 90 parts polyvinyl chloride, 8-16 parts high-density polyethylene, 10-18 parts MQ silicone resin, 4-8 parts vinyl chloride-vinyl acetate copolymer, 8-16 parts bauxite, 0.3-0.4 parts antioxidant, and 1-2 parts plasticizer. The MQ silicone resin comprises vinyl MQ silicone resin and methyl MQ silicone resin in a weight ratio of 1-9:1. This technical solution solves the problem of poor high-temperature resistance of the outer sheath layer in related arts for shielded control cables.

Description

Technical Field

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

[0002] Shielded control cables are used to transmit control and measurement signals. They are widely used in remote operation, control, and signal transmission scenarios in industrial and mining enterprises, energy and transportation sectors, and modern high-rise buildings. Shielded control cables typically consist of a basic conductor layer, an insulation layer, a shielding layer, and an outer sheath. The conductor layer is typically made of metal materials such as copper or aluminum and primarily transmits electrical signals. The insulation layer, typically made of high-pressure polyethylene, fluoroplastics, silicone rubber, and other insulating materials, isolates the conductor from the outside world, preventing leakage and short circuits, while also providing some insulation and protection. A shielding layer made of materials such as copper tape, copper wire, aluminum foil, conductive cloth, or braided copper mesh is placed outside the insulation layer. This shielding layer isolates electromagnetic noise sources from sensitive equipment, cutting off the noise source's propagation path and preventing interference signals from entering the inner conductor. This reduces transmission signal loss and prevents internal signals from radiating outward and interfering with other equipment. The outermost layer, typically the outer sheath, protects the cable's internal structure from environmental influences such as mechanical damage, moisture intrusion, and chemical corrosion, thereby enhancing cable safety.

[0003] The outer sheath is the outermost layer of the cable. Although it doesn't come into direct contact with the conductor, it protects the cable's internal insulation, shielding, and other structures from the effects of high temperatures. Currently, however, shielded control cables typically incorporate large amounts of high-temperature-resistant additives (such as metal oxides and ceramic powders) into the outer sheath to achieve high-temperature resistance. While this approach can meet the requirements of high-temperature environments to a certain extent, the addition of these additives complicates the extrusion process and increases internal non-uniformity, limiting the outer sheath's high-temperature resistance and reducing cable stability.

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

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

[0006] The technical solutions of the present invention are as follows:

[0007] The present invention provides a high-temperature and weather-resistant shielded control cable, which comprises, from the inside to the outside, a conductor, an insulation layer, a shielding layer, and an outer sheath layer, wherein the outer sheath layer comprises the following components in parts by weight:

[0008] 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;

[0009] The MQ silicone resin includes vinyl MQ silicone resin and methyl MQ silicone resin in a weight ratio of 1 to 9:1.

[0010] In the present invention, the shielded control cable is composed of a conductor, an insulating layer, a shielding layer and an outer sheath layer. The outer sheath layer is based on polyvinyl chloride, which gives the outer sheath layer basic processing properties and can provide basic protection for the cable. High-density polyethylene and polyvinyl chloride are used in combination to increase the flexibility of the outer sheath layer, making the cable easy to operate when stretched and less likely to crack.

[0011] In the present invention, polyvinyl chloride is a polymer formed by free radical polymerization of vinyl chloride monomer in the presence of initiators such as peroxides and azo compounds, or under the action of light or heat. Polyvinyl chloride can be regarded as the result of one hydrogen atom in each monomer unit on the polyethylene molecular chain being alternately replaced by a chlorine atom. The presence of chlorine increases the attraction between the molecular chains, so that the polyvinyl chloride polymer has 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, preferably polyvinyl chloride NI00-50.

[0012] In the present invention, high-density polyethylene is a polymer synthesized from ethylene monomer under low or medium pressure and certain temperature conditions. The symmetry and regularity of its molecular chain give the high-density polyethylene good chemical stability and processing performance. 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 is preferably high-density polyethylene DMDA-8008H.

[0013] In the present invention, bauxite is a mineral containing refractory clay, which has a high hardness. While it can effectively prevent fire in the outer sheath layer of the cable, it can also be used as a filler to improve the overall mechanical strength of the outer sheath layer of the cable, so that it can better withstand external tension and extend the service life of the cable.

[0014] As a further technical solution, the weight ratio of the vinyl MQ silicone resin to the methyl MQ silicone resin is 2-5:1.

[0015] In the present invention, when the weight ratio of vinyl MQ silicone resin to methyl MQ silicone resin is 2-5:1, the high temperature resistance of the outer sheath layer of the shielded control cable can be further improved by using vinyl MQ silicone resin, methyl MQ silicone resin and vinyl chloride-vinyl acetate copolymer in combination, so that the thermal stability time of the outer sheath layer at 200°C is increased to 272-279 minutes. 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.

[0016] As a further technical solution, the vinyl content in the vinyl MQ silicone resin is 0.5wt%~1.5wt%.

[0017] As a further technical solution, the bauxite is a composite bauxite containing a hydroxybiphenyl compound, and the raw materials of the composite bauxite containing a hydroxybiphenyl compound include bauxite and a hydroxybiphenyl compound in a weight ratio of 20:1 to 4.

[0018] In the present invention, bauxite is composite-treated with a hydroxybiphenyl compound to improve the tensile strength of the outer sheath layer of the shielded control cable. The reason for this may be that after the bauxite is treated with a hydroxybiphenyl compound, the interfacial bonding effect with the polyvinyl chloride substrate is enhanced, thereby improving the tensile strength of the outer sheath layer of the shielded control cable.

[0019] In the present invention, the hydroxyl-containing biphenyl compound can be one of 4,4'-dihydroxybiphenyl and p-phenylphenol, or 4,4'-dihydroxybiphenyl and p-phenylphenol in a weight ratio of 1:9 to 4:1, preferably 4,4'-dihydroxybiphenyl and p-phenylphenol in a weight ratio of 1 to 3:1.

[0020] 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, and preferably 45 μm.

[0021] As a further technical solution, the preparation method of the composite bauxite containing hydroxybiphenyl compound comprises the following steps:

[0022] A1. Mixing the bauxite and an alkaline solution, ball milling, and drying to obtain a bauxite pre-treated product;

[0023] A2. After dissolving the hydroxybiphenyl compound in ethanol, add the bauxite pre-treated material, mix evenly, concentrate, and dry to obtain a hydroxybiphenyl compound composite bauxite.

[0024] In the present invention, after the bauxite is pretreated with the solution, the activity and contact area of ​​the bauxite can be increased, thereby improving the composite effect of the hydroxybiphenyl compound on the bauxite.

[0025] As a further technical solution, in step A1, the weight ratio of bauxite to alkaline solution is 20:7-10, which can be 20:7, 20:8, 20:9, or 20:10;

[0026] The alkaline solution includes one or more of a sodium hydroxide aqueous solution, a sodium bicarbonate aqueous solution, and a potassium hydroxide aqueous solution;

[0027] During the ball milling, the rotation speed is 400-500 rpm and the time is 20-30 min.

[0028] As a further technical solution, the mass fraction of the alkaline solution is 10% to 15%, which can be 10%, 11%, 12%, 12.5%, 13%, 14%, 15%, and preferably 12%.

[0029] As a further technical solution, in step A2, when the mixing is uniform, the rotation speed is 600-700 rpm and the time is 45-75 min.

[0030] As a further technical solution, the conductor is made of a copper alloy or an aluminum alloy;

[0031] The insulating layer is a polyvinyl chloride insulating layer;

[0032] The shielding layer is a copper wire braided shielding layer.

[0033] 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 certain external impact without affecting the electrical conductivity.

[0034] When the insulation layer is made of polyvinyl chloride, polyvinyl chloride has a high resistivity, which 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 insulation layer can match the base material of the outer sheath layer, and the inner insulation layer and the outer sheath layer can form a more compact structure, thereby improving the overall performance and reliability of the shielded control cable.

[0035] When the shielding layer is a copper wire braided shielding layer, the copper wire braided shielding layer can reflect external electromagnetic interference signals to prevent them from entering the cable and affecting the signal transmission in the conductor. In addition, the copper wire braided shielding layer also has certain strength and toughness, which can provide additional mechanical protection for the cable.

[0036] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, antioxidant 1076, and antioxidant 300.

[0037] In the present invention, the oxidation reaction will make the outer sheath 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 oxidation chain reaction, thereby inhibiting the oxidation of the outer sheath material of the cable, so that the cable maintains good tensile strength during long-term use, and ensures 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, so that it can still maintain good performance at relatively high temperatures, avoid material failure due to thermal oxidation, and thus increase 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.

[0038] As a further technical solution, the plasticizer includes one or more of dioctyl adipate, dibutyl phthalate, and dioctyl sebacate.

[0039] In the present invention, the addition of a plasticizer can weaken the interaction between polymer molecular chains in the outer sheath layer, increase the mobility of the molecular chains, and enable polyvinyl chloride and other components to melt at a relatively low temperature, thereby reducing processing energy consumption and improving production efficiency. The plasticizer includes one or more of dioctyl adipate, dibutyl phthalate, and dioctyl sebacate, preferably dibutyl phthalate.

[0040] The present invention also provides a method for preparing a high-temperature resistant and weather-resistant shielded control cable, which is used to prepare the high-temperature resistant and weather-resistant shielded control cable, comprising the following steps:

[0041] S1, extruding the insulating layer and coating it on the periphery of the conductor to form a conductor coated with the insulating layer;

[0042] S2. Wrapping the shielding layer around the conductor covered with the insulation layer to form a semi-finished cable;

[0043] S3. Blend the components of the outer sheath layer, extrude and coat them around the outer periphery of the semi-finished cable to obtain a shielded control cable.

[0044] The working principle and beneficial effects of the present invention are:

[0045] In the present invention, MQ silicone resin is a special type of silicone resin composed of monofunctional siloxane chain segments and tetrafunctional siloxane chain segments. 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 between vinyl MQ silicone resin and methyl MQ silicone resin and other molecules. Under high temperature conditions, the three work together to form a thermally stable system with a moderate internal density. Without using a large amount of bauxite, the high-temperature resistance of the outer sheath layer of the shielded control cable can be significantly improved. DETAILED DESCRIPTION

[0046] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0047] In the following embodiments and comparative examples, the model of polyvinyl chloride is NI00-50; the model of high-density polyethylene is DMDA-8008H; the model of vinyl MQ silicone resin is 5202P, purchased from Shenzhen Jipeng Silicon Fluorine Materials Co., Ltd.; the model of methyl MQ silicone resin is BM-803; the model of vinyl chloride-vinyl acetate copolymer is LC-201; the average particle size of bauxite is 45 μm; the model of methyl phenyl silicone resin is JP-LNU3040, purchased from Jining Tangyi Chemical Co., Ltd.; the material of the conductor is copper alloy, model MF202.

[0048] Example 1

[0049] The high temperature and weather resistant shielded control cable includes the following steps:

[0050] S1. Extruding a polyvinyl chloride insulation layer and coating it on the outer periphery of the copper alloy conductor to form a copper alloy conductor coated with the polyvinyl chloride insulation layer;

[0051] S2. Wrapping the copper wire braided shielding layer around the copper alloy conductor covered with the polyvinyl chloride insulation layer to form a semi-finished cable;

[0052] 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 parts of antioxidant 1010, and 1 part of dibutyl phthalate, and extrude and coat them on the periphery of the cable semi-finished product to obtain a shielded control cable.

[0053] Example 2

[0054] High temperature and weather resistant shielded control cable, including the following steps:

[0055] S1. Extruding a polyvinyl chloride insulation layer and coating it on the outer periphery of the copper alloy conductor to form a copper alloy conductor coated with the polyvinyl chloride insulation layer;

[0056] S2. Wrapping the copper wire braided shielding layer around the copper alloy conductor covered with the polyvinyl chloride insulation layer to form a semi-finished cable;

[0057] S3. 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 parts of antioxidant 1010, and 1.5 parts of dibutyl phthalate are blended and extruded and coated on the outer periphery of the cable semi-finished product to obtain a shielded control cable.

[0058] Example 3

[0059] High temperature and weather resistant shielded control cable, including the following steps:

[0060] S1. Extruding a polyvinyl chloride insulation layer and coating it on the outer periphery of the copper alloy conductor to form a copper alloy conductor coated with the polyvinyl chloride insulation layer;

[0061] S2. Wrapping the copper wire braided shielding layer around the copper alloy conductor covered with the polyvinyl chloride insulation layer to form a semi-finished cable;

[0062] S3. 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 parts of antioxidant 1010, and 2 parts of dibutyl phthalate are blended and extruded and coated on the outer periphery of the cable semi-finished product to obtain a shielded control cable.

[0063] Example 4

[0064] The only difference between this embodiment and embodiment 2 is that, in this embodiment, the amount of vinyl MQ silicone resin added is 10.8 parts, and the amount of methyl MQ silicone resin added is 1.2 parts.

[0065] Example 5

[0066] The only difference between this embodiment and embodiment 2 is that, in this embodiment, the amount of vinyl MQ silicone resin added is 10 parts, and the amount of methyl MQ silicone resin added is 2 parts.

[0067] Example 6

[0068] The only difference between this embodiment and embodiment 2 is that, in this embodiment, the amount of vinyl MQ silicone resin added is 8 parts, and the amount of methyl MQ silicone resin added is 4 parts.

[0069] Example 7

[0070] The only difference between this embodiment and embodiment 6 is that in this embodiment, the bauxite is a composite bauxite containing a hydroxybiphenyl compound, and the preparation method of the composite bauxite containing a hydroxybiphenyl compound comprises the following steps:

[0071] A1. Mix 20 parts of bauxite and 7 parts of a 12% sodium bicarbonate aqueous solution, ball mill at 400 rpm for 30 min, and dry to obtain a bauxite pre-treated product;

[0072] A2. Dissolve 0.5 parts of 4,4'-dihydroxybiphenyl and 0.5 parts of p-phenylphenol in 40 parts of ethanol, add the above-mentioned bauxite pretreatment material, stir at 600 rpm for 75 minutes, mix evenly, concentrate, and dry to obtain a hydroxybiphenyl compound-containing composite bauxite;

[0073] High temperature and weather resistant shielded control cable, including the following steps:

[0074] S1. Extruding a polyvinyl chloride insulation layer and coating it on the outer periphery of the copper alloy conductor to form a copper alloy conductor coated with the polyvinyl chloride insulation layer;

[0075] S2. Wrapping the copper wire braided shielding layer around the copper alloy conductor covered with the polyvinyl chloride insulation layer to form a semi-finished cable;

[0076] S3. 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 parts of antioxidant 1010, and 1.5 parts of dibutyl phthalate are blended and extruded and coated on the outer periphery of the cable semi-finished product to obtain a shielded control cable.

[0077] Example 8

[0078] The only difference between this embodiment and embodiment 7 is that, in this embodiment, the preparation method of the composite bauxite containing a hydroxybiphenyl compound is different, and the preparation method comprises the following steps:

[0079] A1. Mix 20 parts of bauxite and 10 parts of a 12% sodium bicarbonate aqueous solution, ball-mill at 500 rpm for 20 min, and dry to obtain a bauxite pre-treated product;

[0080] A2. Dissolve 2 parts of 4,4'-dihydroxybiphenyl and 2 parts of p-phenylphenol in 40 parts of ethanol, add the above-mentioned bauxite pretreatment material, stir at 700 rpm for 45 minutes, mix evenly, concentrate, and dry to obtain a hydroxybiphenyl compound-containing composite bauxite.

[0081] Example 9

[0082] The only difference between this embodiment and embodiment 8 is that in the preparation process of the composite bauxite containing hydroxybiphenyl compound in this embodiment, the amount of 4,4'-dihydroxybiphenyl added is 3 parts and the amount of p-phenylphenol added is 1 part.

[0083] Example 10

[0084] High temperature and weather resistant shielded control cable, including the following steps:

[0085] S1. Extruding a polyvinyl chloride insulation layer and coating it on the outer periphery of the copper alloy conductor to form a copper alloy conductor coated with the polyvinyl chloride insulation layer;

[0086] S2. Wrapping the copper wire braided shielding layer around the copper alloy conductor covered with the polyvinyl chloride insulation layer to form a semi-finished cable;

[0087] S3. 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 parts of p-phenylphenol, 0.35 parts of antioxidant 1010, and 1.5 parts of dibutyl phthalate are blended and extruded and coated on the periphery of the cable semi-finished product to obtain a shielded control cable.

[0088] Comparative Example 1

[0089] The only difference between this comparative example and Example 1 is that in this comparative example, the vinyl MQ silicone resin is replaced by an equal amount of methyl MQ silicone resin.

[0090] Comparative Example 2

[0091] The only difference between this comparative example and Example 1 is that in this comparative example, the methyl MQ silicone resin is replaced by an equal amount of vinyl MQ silicone resin.

[0092] Comparative Example 3

[0093] The only difference between this comparative example and Example 1 is that in this comparative example, vinyl MQ silicone resin and methyl MQ silicone resin are replaced by an equal amount of methylphenyl silicone resin.

[0094] Comparative Example 4

[0095] The only difference between this comparative example and Example 1 is that in this comparative example, neither vinyl MQ silicone resin nor methyl MQ silicone resin is added, and 14 parts of vinyl chloride-vinyl acetate copolymer is added.

[0096] Comparative Example 5

[0097] The only difference between this comparative example and Example 1 is that in this comparative example, no vinyl chloride-vinyl acetate copolymer is added, 7 parts of vinyl MQ silicone resin and 7 parts of methyl MQ silicone resin are added.

[0098] Comparative Example 6

[0099] The only difference between this comparative example and Example 1 is that in this comparative example, the vinyl chloride-vinyl acetate copolymer is replaced by an equal amount of ethylene-vinyl acetate copolymer.

[0100] Experimental Example 1

[0101] Three specimens were cut from the outer sheath layer of the shielded control cables prepared in Examples 1 to 6 and Comparative Examples 1 to 6, each with a length of 30 mm and a thickness of 3 mm. The outer sheath layer specimens were subjected to a thermal stability time test at 200°C in accordance with the method specified in GB / T 2951.32-2008 "General test methods for insulation and sheathing materials of electrical and optical cables - Part 32: Special test methods for polyvinyl chloride mixtures - Weight loss test and thermal stability test". The results are the average of the three specimens. The test results are shown in Table 1.

[0102] Table 1 Test results of high temperature resistance performance of outer sheath layer

[0103]

[0104] As can be seen from Table 1, 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 is significantly improved, indicating that the MQ silicone resin includes vinyl MQ silicone resin and methyl MQ silicone resin. The high temperature resistance of the outer sheath layer of the shielded control cable can be significantly improved by using vinyl chloride-vinyl acetate copolymer, vinyl MQ silicone resin and methyl MQ silicone resin in combination.

[0105] Experimental Example 2

[0106] Three samples 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 / T2951.11-2008 "General test methods for insulation and sheath materials of electric and optical cables Part 11: General test methods for thickness and dimensional measurements - Mechanical properties tests". The tensile strength was tested. The test results are shown in Table 2.

[0107] Table 2 Test results of outer sheath tensile strength

[0108]

[0109] Compared with Example 6 and Example 10, the tensile strength of the outer sheath layer of the shielded control cable in Examples 7 to 9 is improved, indicating that the tensile strength of the outer sheath layer of the shielded control cable can be improved by composite treatment of bauxite with a hydroxyl biphenyl compound.

[0110] The above are only 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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high temperature and weather resistant shielded control cable, comprising a conductor, an insulation 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 comprises vinyl MQ silicone resin and methyl MQ silicone resin in a weight ratio of 1 to 9:1; The bauxite is a composite bauxite containing a hydroxy biphenyl compound, and the raw materials of the composite bauxite containing a hydroxy biphenyl compound include bauxite and a hydroxy biphenyl compound in a weight ratio of 20:1-4.

2. The 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 hydroxybiphenyl compound comprises 4,4'-dihydroxybiphenyl and p-phenylphenol in a weight ratio of 1 to 3:

1.

4. The high temperature and weather resistant shielded control cable according to claim 1, 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 composite bauxite.

5. The high temperature and weather resistant shielded control cable according to claim 4, 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.

6. The high temperature and weather resistant shielded control cable according to claim 4, 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.

7. 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.

8. 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 .

9. 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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