Long-life cable for nuclear power

Abstract

The invention relates to the technical field of cables, and provides a long-life cable for nuclear power, which sequentially comprises a conductor, an insulating layer, a shielding layer and a sheath layer from inside to outside, the sheath layer comprises the following components in parts by weight: 60-70 parts of high-density polyethylene, 12-22 parts of carboxy nitrile rubber, 4-8 parts of a styrene-acrylonitrile copolymer, 0.5-8 parts of a copper metal organic complex, 8-15 parts of palygorskite powder, 2-5 parts of zinc oxide, 0.5-1.3 parts of an antioxidant, 1-3 parts of a plasticizer and 0.2-0.5 part of a vulcanizing agent; the copper metal organic complex comprises copper trifluoromethanesulfonate and copper acetylacetonate in a weight ratio of (1-3): 1. According to the technical scheme, the problem of poor aging resistance of the sheath layer of the nuclear power 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 - life cable for nuclear power. Background Art

[0002] The operating environment of nuclear power plants is complex. As a key component for power transmission and signal control, cables are long - term exposed to extreme conditions such as high radiation, high temperature, high humidity, and strong electromagnetic interference, which pose extremely high requirements on the performance and life of cables. Traditional cable materials are prone to problems such as aging, decline in mechanical properties, and insulation failure in such harsh environments, seriously affecting the safe and stable operation of nuclear power plants.

[0003] Currently, the sheath layer of cables for nuclear power usually uses high - density polyethylene or rubber - like materials as the matrix, and fillers and additives are added to improve their aging resistance, radiation resistance, and mechanical properties. However, the unsaturated double bonds in the molecular chains of some unsaturated rubber materials are prone to oxidation reactions under high - temperature and radiation conditions, leading to material aging. To solve this problem, vulcanization systems or stabilizing additives are usually used in the prior art to inhibit rubber aging, but the aging phenomenon of the cable sheath layer cannot be effectively reduced.

[0004] Therefore, researching and developing a high - life cable for nuclear power can effectively improve the aging resistance of the cable sheath layer, which is of great significance for extending the service life of cables for nuclear power and meeting the requirements of long - term stable operation of nuclear power plants. Summary of the Invention

[0005] The present invention provides a high - life cable for nuclear power, which solves the problem of poor aging resistance of the cable sheath layer in related technologies.

[0006] The technical solution of the present invention is as follows: The present invention provides a high - life cable for nuclear power, which sequentially includes a conductor, an insulating layer, a shielding layer, and a sheath layer from inside to outside. The sheath layer includes the following components in parts by weight: 60 - 70 parts of high - density polyethylene, 12 - 22 parts of carboxyl - nitrile rubber, 4 - 8 parts of styrene - acrylonitrile copolymer, 0.5 - 8 parts of copper - based metal organic complex, 8 - 15 parts of palygorskite powder, 2 - 5 parts of zinc oxide, 0.5 - 1.3 parts of antioxidant, 1 - 3 parts of plasticizer, 0.2 - 0.5 parts of vulcanizing agent; The copper - based metal organic complex includes copper trifluoromethanesulfonate and copper acetylacetonate with a weight ratio of 1 - 3:1.

[0007] In the present invention, the sheath layer of the high-life cable for nuclear power uses high-density polyethylene as the main base material, which provides the basic strength and stability for the sheath layer, so that it will not be easily damaged in the nuclear power environment. At the same time, under the combined action of carboxylated nitrile rubber, styrene-acrylonitrile copolymer, copper-based metal organic complex, palygorskite powder, zinc oxide, antioxidant, plasticizer, and vulcanizing agent, a sheath layer with good anti-aging performance can be prepared, thereby effectively protecting the high-life cable for nuclear power and increasing the service life of the cable for nuclear power; Among them, carboxylated nitrile rubber itself has good oil resistance and wear resistance. When combined with high-density polyethylene, it can improve the overall performance of the sheath layer of the high-life cable for nuclear power. Palygorskite powder can be added as a reinforcing filler to the sheath layer of the high-life cable for nuclear power. Through the interaction between palygorskite powder and each component in the sheath layer, it helps to improve the mechanical properties of the sheath layer of the high-life cable for nuclear power; The sheath layer material of the high-life cable for nuclear power will inevitably undergo an oxidation reaction in high-temperature and high-humidity environments, resulting in a reduction in the mechanical strength of the sheath layer material and a deterioration in stability. In the present invention, an antioxidant is added. Since the antioxidant can capture free radicals and slow down the oxidation degradation rate of the sheath layer material of the high-life cable for nuclear power, it thus helps to improve the stability of the sheath layer material and extends the service life of the cable. The antioxidant is a conventional antioxidant in the art, for example, it can be one or more of antioxidant 245, antioxidant 1024, antioxidant 1010, antioxidant 1076, antioxidant 626, antioxidant 4020; The addition of a plasticizer can, to a certain extent, reduce the melt viscosity and glass transition temperature of the sheath layer material of the high-life cable, making the sheath layer material more easily flowable and moldable during the processing. At the same time, the plasticizer can be better compatible with each component in the sheath layer, making the entire sheath layer system more uniform and stable. The plasticizer is a conventional plasticizer in the art, for example, it can be dioctyl phthalate, dibutyl phthalate, tricresyl phosphate, dioctyl sebacate, dioctyl adipate; In the present invention, the addition of a vulcanizing agent to the sheath layer of the high-life cable for nuclear power helps the carboxylated nitrile rubber to form a cross-linked structure, thereby improving the stability of the carboxylated nitrile rubber to a certain extent. The vulcanizing agent is a conventional vulcanizing agent in the art, for example, it can be sulfur, dicumyl peroxide.

[0008] As a further technical solution, the weight ratio of the carboxylated nitrile rubber to the copper-based metal organic complex is 20:2 to 5, for example, it can be 20:2, 20:3, 20:4, 20:5, and preferably 20:2, 20:5.

[0009] In the present invention, a copper-based metal organic complex is used to act on carboxy nitrile rubber, and the weight ratio of the copper-based metal organic complex to carboxy nitrile rubber is reasonably regulated. When the weight ratio of carboxy nitrile rubber to the copper-based metal organic complex is 20:2 to 5, the aging resistance of the high-life cable sheath layer for nuclear power can be further improved, and the tensile strength after aging is increased to 25.1 to 25.6 MPa. When the weight ratio of carboxy nitrile rubber to the copper-based metal organic complex is outside the range of 20:2 to 5, the effect of improving the aging resistance of the high-life cable sheath layer for nuclear power is slightly worse.

[0010] As a further technical solution, the material of the conductor is one of aluminum alloy and copper alloy.

[0011] As the carrier for transmitting electric energy or signals, the conductor directly determines the applicability of the high-life cable for nuclear power in actual use. In the present invention, the material of the conductor is aluminum alloy or copper alloy. Aluminum alloy or copper alloy endows the conductor with good electrical conductivity. At the same time, aluminum alloy conductors and copper alloy conductors can withstand a certain amount of external force, ensuring that the high-life cable for nuclear power can stably transmit electricity in high-temperature, low-temperature, and other more severe environments.

[0012] As a further technical solution, the insulating layer is a polyvinyl chloride insulating layer; The shielding layer is a copper wire braided shielding layer.

[0013] In the present invention, the insulating layer of the high-life cable for nuclear power is a polyvinyl chloride insulating layer. Polyvinyl chloride itself has good resistivity, which can prevent current leakage and protect the conductor at the same time. Combined with the copper wire braided shielding layer and the sheath layer, the overall stability of the high-life cable for nuclear power can be effectively improved.

[0014] The shielding layer is a copper wire braided shielding layer. The copper wire braided shielding layer can effectively prevent the influence of the complex and strong electromagnetic environment inside the nuclear power plant on the signals or electric energy transmitted inside the cable. At the same time, the copper wire braided shielding layer has a certain mechanical strength and can protect the insulating layer and conductor inside the cable to a certain extent.

[0015] As a further technical solution, the vulcanizing agent includes dicumyl peroxide.

[0016] In the present invention, the vulcanizing agent is preferably dicumyl peroxide. Dicumyl peroxide has a relatively fast vulcanization speed and can make the carboxy nitrile rubber reach the required vulcanization degree in a relatively short time, improving production efficiency. At the same time, compared with the vulcanization system formed by sulfur, the non-sulfur vulcanization system of dicumyl peroxide has better stability for carboxy nitrile rubber.

[0017] As a further technical solution, the antioxidant includes one or more of antioxidant 245, antioxidant 1024, and antioxidant 1010.

[0018] In the present invention, the structures of antioxidant 245, antioxidant 1024, and antioxidant 1010 are relatively stable, and their own antioxidant lifetimes are relatively long. When the antioxidant includes one or more of antioxidant 245, antioxidant 1024, and antioxidant 1010, it can more effectively prevent the oxidative degradation of the cable sheath layer material, thereby improving the service life of the cable sheath layer for nuclear power applications.

[0019] As a further technical solution, the plasticizer includes one or more of dioctyl phthalate, tricresyl phosphate, and dioctyl sebacate.

[0020] In the present invention, among the conventional plasticizers in the art, dioctyl phthalate, tricresyl phosphate, and dioctyl sebacate have good compatibility with each component in the sheath layer, and can better improve the processing performance of the cable sheath layer material for nuclear power applications and enhance its stability.

[0021] As a further technical solution, the palygorskite powder is intercalated modified palygorskite powder, and the raw materials of the intercalated modified palygorskite powder include palygorskite powder and terminal hydroxyl polyethersulfone.

[0022] Palygorskite powder has an interaction with each component in the sheath layer. When the amount of palygorskite powder is relatively too large, the hardness increases and it is prone to agglomeration, which will increase the compression set of the sheath layer material, especially rubber materials, reduce the low-temperature resistance of the overall sheath layer, and reducing the amount of palygorskite powder will affect its overall supporting and strengthening effect on the sheath layer. In the present invention, the palygorskite powder is treated by intercalation modification with terminal hydroxyl polyethersulfone to improve the dispersion degree of palygorskite powder in the sheath layer system, so as to ensure the strength performance of the high-life cable sheath layer for nuclear power applications while also improving the low-temperature resistance of the sheath layer.

[0023] As a further technical solution, the terminal hydroxyl polyethersulfone is 9% - 12% of the weight of the palygorskite powder, for example, it can be 9%, 10%, 11%, 12%, and preferably 9%, 12%.

[0024] In the present invention, when the terminal hydroxyl polyethersulfone is 9% - 12% of the weight of the palygorskite powder, the low-temperature resistance of the high-life cable sheath layer for nuclear power applications can be further improved, and the elongation at break of the -40°C low-temperature tensile of the sheath layer is increased to 127% - 131%.

[0025] As a further technical solution, the preparation method of the intercalated modified palygorskite powder includes the following steps: A1. Disperse the palygorskite powder in dimethylformamide, and disperse it evenly to obtain a suspension; A2. Dissolve the hydroxyl-terminated polyethersulfone in dimethylformamide, mix evenly to obtain a mixed solution. A3. Add the mixed solution to the suspension, mix evenly, concentrate, and dry to obtain intercalated modified palygorskite powder. As a further technical solution, in step A1, when dispersing evenly, stir at 200 - 300 rpm for 20 - 30 min.

[0026] As a further technical solution, in step A2, when mixing evenly, stir at 200 - 300 rpm and 50 - 60 °C for 30 - 40 min.

[0027] As a further technical solution, in step A3, when mixing evenly, stir at 100 - 200 rpm and 40 - 50 °C for 30 - 40 min.

[0028] The present invention also provides a preparation method of the high - life cable for nuclear power, used to prepare the high - life cable for nuclear power, including the following steps: S1. Extrude and coat the insulating layer on the outer side of the conductor to form an insulating layer with a conductor inside. S2. Wrap the shielding layer around the insulating layer with a conductor inside to form a cable semi - finished product. S3. Mix the carboxyl - nitrile rubber and the copper - based metal organic complex evenly, then add the remaining components in the sheath layer, blend, extrude and coat around the cable semi - finished product, and vulcanize to obtain the high - life cable for nuclear power.

[0029] The working principle and beneficial effects of the present invention are as follows: In the present invention, a copper - based metal organic complex is added to the sheath layer of the high - life cable for nuclear power. Through the stabilizing effect of the copper - based metal organic complex on the carboxyl - nitrile rubber, the aging resistance of the sheath layer of the high - life cable for nuclear power is improved. At present, due to the presence of unsaturated double bonds in the carboxyl - nitrile rubber in the cable sheath layer, the sheath layer is prone to aging. To solve this problem, usually only the vulcanization system is used or a fatty acid salt stabilizing agent is used in combination with the vulcanization system to inhibit the aging of the carboxyl - nitrile rubber. However, only using the vulcanization system to inhibit rubber aging has limited effect, and the fatty acid salt stabilizing agent will be affected by vulcanization pollution. Therefore, the effect of using the fatty acid salt stabilizing agent in combination with the vulcanization system to inhibit rubber aging still needs to be improved. Considering the combination of the vulcanization system and the stabilizing agent, the present invention uses a copper - based metal organic complex as the stabilizing agent for the carboxyl - nitrile rubber, which can reduce the direct contact between the carboxyl - nitrile rubber and active free radicals. While avoiding the influence of the vulcanization process on the self - stabilizing effect of the copper - based metal organic complex, it can effectively improve the aging resistance of the carboxyl - nitrile rubber, thereby improving the aging resistance of the sheath layer of the high - life cable for nuclear power. Detailed Implementation Modes

[0030] 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.

[0031] In the following embodiments and comparative examples, in the polyvinyl chloride insulating layer, the model of polyvinyl chloride is NI00-50; the model of high-density polyethylene is DMDA-8008H; the model of carboxybutadiene rubber is 1072CG; copper trifluoromethanesulfonate, CAS number is 34946-82-2; copper acetylacetonate, CAS number is 13395-16-9; the model of styrene-acrylonitrile copolymer is NF2200AR; the average particle size of palygorskite powder is 45μm; the model of hydroxyl-terminated polyethersulfone is VW-10300FP, purchased from Dongguan Dongli Plastic Raw Materials Co., Ltd.

[0032] Example 1 A preparation method of a high-life cable for nuclear power plants, comprising the following steps: S1. Extrude and coat the polyvinyl chloride insulating layer on the outside of the aluminum alloy conductor to form a polyvinyl chloride insulating layer with an aluminum alloy conductor wrapped inside; S2. Wrap the copper wire braided shielding layer around the outside of the polyvinyl chloride insulating layer with an aluminum alloy conductor wrapped inside to form a cable semi-finished product; S3. Mix 12 parts of carboxybutadiene rubber, 0.25 parts of copper trifluoromethanesulfonate, and 0.25 parts of copper acetylacetonate evenly, and then add 60 parts of high-density polyethylene, 4 parts of styrene-acrylonitrile copolymer, 8 parts of palygorskite powder, 2 parts of zinc oxide, 0.5 part of antioxidant 245, 1 part of dioctyl phthalate, and 0.2 part of dicumyl peroxide for blending, extrude and coat it around the cable semi-finished product, and vulcanize to obtain a high-life cable for nuclear power plants.

[0033] Example 2 A preparation method of a high-life cable for nuclear power plants, comprising the following steps: S1. Extrude and coat the polyvinyl chloride insulating layer on the outside of the aluminum alloy conductor to form a polyvinyl chloride insulating layer with an aluminum alloy conductor wrapped inside; S2. Wrap the copper wire braided shielding layer around the outside of the polyvinyl chloride insulating layer with an aluminum alloy conductor wrapped inside to form a cable semi-finished product; S3. Mix 20 parts of carboxy nitrile rubber, 4.5 parts of copper trifluoromethanesulfonate, and 1.5 parts of copper acetylacetonate evenly, then add 65 parts of high-density polyethylene, 6 parts of styrene-acrylonitrile copolymer, 10 parts of palygorskite powder, 3 parts of zinc oxide, 1 part of antioxidant 1010, 2 parts of tricresyl phosphate, and 0.3 parts of dicumyl peroxide, blend them, extrude and coat the mixture around the semi-finished cable, and vulcanize to obtain a high-life cable for nuclear power.

[0034] Example 3 A preparation method of a high-life cable for nuclear power includes the following steps: S1. Extrude and coat a polyvinyl chloride insulating layer on the outer side of an aluminum alloy conductor to form a polyvinyl chloride insulating layer with an aluminum alloy conductor inside. S2. Wrap a copper wire braided shielding layer around the outside of the polyvinyl chloride insulating layer with an aluminum alloy conductor inside to form a semi-finished cable. S3. Mix 22 parts of carboxy nitrile rubber, 5 parts of copper trifluoromethanesulfonate, and 3 parts of copper acetylacetonate evenly, then add 70 parts of high-density polyethylene, 8 parts of styrene-acrylonitrile copolymer, 15 parts of palygorskite powder, 5 parts of zinc oxide, 1.3 parts of antioxidant 1024, 3 parts of dioctyl sebacate, and 0.5 parts of dicumyl peroxide, blend them, extrude and coat the mixture around the semi-finished cable, and vulcanize to obtain a high-life cable for nuclear power.

[0035] Example 4 The difference between this example and Example 2 is only that in this example, 3 parts of copper trifluoromethanesulfonate and 3 parts of copper acetylacetonate are added.

[0036] Example 5 The difference between this example and Example 2 is only that in this example, 0.75 part of copper trifluoromethanesulfonate and 0.25 part of copper acetylacetonate are added.

[0037] Example 6 The difference between this example and Example 2 is only that in this example, 1.5 parts of copper trifluoromethanesulfonate and 0.5 part of copper acetylacetonate are added.

[0038] Example 7 The difference between this example and Example 2 is only that in this example, 3.75 parts of copper trifluoromethanesulfonate and 1.25 parts of copper acetylacetonate are added.

[0039] Example 8 The difference between this example and Example 7 is only that in this example, the palygorskite powder is intercalated modified palygorskite powder, and the preparation method of the intercalated modified palygorskite powder includes the following steps: A1. Disperse 10 parts of palygorskite powder in 20 parts of dimethylformamide, stir at 250 rpm for 25 min until evenly dispersed to obtain a suspension; A2. Dissolve 1.5 parts of hydroxyl-terminated polyethersulfone in 5 parts of dimethylformamide, stir at 200 rpm and 55 °C for 35 min, and mix evenly to obtain a mixed solution. A3. Add the mixed solution to the suspension, stir at 150 rpm and 45 °C for 35 min, mix evenly, concentrate, and dry to obtain intercalated modified palygorskite powder. A preparation method of a high-life cable for nuclear power plants, comprising the following steps: S1. Extrude and coat a polyvinyl chloride insulation layer on the outer side of an aluminum alloy conductor to form a polyvinyl chloride insulation layer with an aluminum alloy conductor wrapped inside. S2. Wrap a copper wire braided shielding layer around the outer side of the polyvinyl chloride insulation layer with an aluminum alloy conductor wrapped inside to form a cable semi-finished product. S3. Mix 20 parts of carboxy nitrile rubber, 3.75 parts of copper trifluoromethanesulfonate, and 1.25 parts of copper acetylacetonate evenly, then add 65 parts of high-density polyethylene, 6 parts of styrene-acrylonitrile copolymer, 10 parts of intercalated modified palygorskite powder, 3 parts of zinc oxide, 1 part of antioxidant 1024, 2 parts of tricresyl phosphate, and 0.3 part of dicumyl peroxide, blend them, extrude and coat them around the cable semi-finished product, and vulcanize to obtain a high-life cable for nuclear power plants.

[0040] Example 9 The difference between this example and Example 8 is only that in the preparation process of the intercalated modified palygorskite powder in this example, 0.5 part of hydroxyl-terminated polyether is added.

[0041] Example 10 The difference between this example and Example 8 is only that in the preparation process of the intercalated modified palygorskite powder in this example, 0.9 part of hydroxyl-terminated polyether is added.

[0042] Example 11 The difference between this example and Example 8 is only that in the preparation process of the intercalated modified palygorskite powder in this example, 1.2 parts of hydroxyl-terminated polyether are added.

[0043] Comparative Example 1 The difference between this comparative example and Example 2 is only that in this comparative example, copper trifluoromethanesulfonate and copper acetylacetonate are replaced with an equal amount of zinc stearate.

[0044] Comparative Example 2 The difference between this comparative example and Example 2 is only that in this comparative example, copper trifluoromethanesulfonate and copper acetylacetonate are replaced with an equal amount of copper stearate.

[0045] Comparative Example 3 The difference between this comparative example and Example 2 is only that in this comparative example, copper trifluoromethanesulfonate is replaced with an equal amount of copper acetylacetonate.

[0046] Comparative Example 4 The difference between this comparative example and Example 2 is only that in this comparative example, copper acetylacetonate is replaced with an equal amount of copper trifluoromethanesulfonate.

[0047] Comparative Example 5 The difference between this comparative example and Example 2 is only that in this comparative example, no copper-based metal organic complex is added; In the preparation method of the high-longevity cable for nuclear power, step S3 is specifically as follows: S3. Blend 20 parts of carboxy nitrile rubber, 65 parts of high-density polyethylene, 6 parts of styrene-acrylonitrile copolymer, 10 parts of palygorskite powder, 3 parts of zinc oxide, 1 part of antioxidant 1024, 2 parts of tricresyl phosphate, and 0.3 part of dicumyl peroxide, and after vulcanization, extrude and coat it on the periphery of the semi-finished cable to obtain the high-longevity cable for nuclear power.

[0048] Experimental Example 1 Aging Resistance Performance Test Cut three specimens from the sheath layers of the high-longevity cables for nuclear power prepared in Examples 1 to 7 and Comparative Examples 1 to 5, and prepare dumbbell specimens with a thickness of 2 mm according to the method in GB / T 2951.11-2008 "General Test Methods for Insulating and Sheathing Materials of Cables and Optical Fibre Cables - Part 11: General Test Methods - Measurement of Thickness and Dimensions, Mechanical Properties Tests" for the tensile strength test before aging; Cut three specimens from the sheath layers of the high-longevity cables for nuclear power prepared in Examples 1 to 7 and Comparative Examples 1 to 5, and after preparing dumbbell specimens with a thickness of 2 mm according to the method in GB / T 2951.11-2008 "General Test Methods for Insulating and Sheathing Materials of Cables and Optical Fibre Cables - Part 11: General Test Methods - Measurement of Thickness and Dimensions, Mechanical Properties Tests", conduct the aging resistance test, and conduct the tensile strength test after aging according to the above method. Among them, the aging resistance test method is the air oven aging method, the temperature is 135 °C, and the time is 240 h.

[0049] The test results are shown in Table 1: Table 1 Aging Resistance Performance Test Results of Examples 1 to 7 and Comparative Examples 1 to 5

[0050] It can be seen from Table 1 that compared with Comparative Examples 1 to 5, after the thermal aging experiment of the sheath layers of the high-longevity cables for nuclear power prepared in Examples 1 to 7, the retention rate of tensile strength is higher. According to the tensile strength retention rate = tensile strength after aging / tensile strength before aging × 100%, the tensile strength retention rate of the sheath layers in Examples 1 to 7 reaches more than 93%, indicating that adding copper trifluoromethanesulfonate and copper acetylacetonate to the sheath layer and through the combined use of copper trifluoromethanesulfonate and copper acetylacetonate can improve the aging resistance performance of the sheath layer.

[0051] Experimental Example 2 Low Temperature Resistance Performance Test Three specimens were cut from the sheath layers of the high-longevity cables for nuclear power generation prepared in Examples 7 to 11. After performing the low temperature test according to the method in GB / T 2951.14-2008 "General Test Methods for Insulating and Sheathing Materials of Cables and Optical Fibre Cables - Part 14: General Test Methods - Low Temperature Test", the elongation at break of the sheath layer at -40°C for low temperature tension was tested, and the test results are shown in Table 2.

[0052] Table 2 Low Temperature Resistance Performance Test Results of Examples 7 to 11

[0053] It can be seen from Table 2 that compared with Example 7, the elongation at break of the sheath layers of Examples 8 to 11 at -40°C for low temperature tension increased, reaching more than 116%, indicating that after the intercalation modification treatment of palygorskite powder with hydroxyl-terminated polyethersulfone, the low temperature resistance performance of the sheath layer of the high-longevity cables for nuclear power generation can be improved.

[0054] 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 high - life cable for nuclear power, which sequentially includes a conductor, an insulating layer, a shielding layer, and a sheath layer from inside to outside, is characterized in that, The sheath layer comprises the following components in parts by weight: 60-70 parts of high-density polyethylene, 12-22 parts of carboxy nitrile rubber, 4-8 parts of styrene-acrylonitrile copolymer, 0.5-8 parts of copper-based metal organic complex, 8-15 parts of palygorskite powder, 2-5 parts of zinc oxide, 0.5-1.3 parts of antioxidant, 1-3 parts of plasticizer, 0.2-0.5 parts of vulcanizing agent; The copper-based metal organic complex comprises copper trifluoromethanesulfonate and copper acetylacetonate with a weight ratio of 1-3:

1.

2. The high-life cable for nuclear power according to claim 1, characterized in that, The weight ratio of the carboxy nitrile rubber to the copper-based metal organic complex is 20:2-5.

3. The high-life cable for nuclear power according to claim 1, wherein, The conductor is made of one of aluminum alloy and copper alloy.

4. A high-life cable for nuclear power according to claim 1, characterized in that, The insulating layer is a polyvinyl chloride insulating layer; The shielding layer is a copper wire braided shielding layer.

5. A high-life cable for nuclear power according to claim 1, characterized in that, The vulcanizing agent is dicumyl peroxide.

6. The high - life cable for nuclear power according to claim 1, wherein, The antioxidant comprises one or more of antioxidant 245, antioxidant 1024, and antioxidant 1010.

7. A high - life cable for nuclear power according to claim 6, characterized in that, The plasticizer comprises one or more of dioctyl phthalate, tricresyl phosphate, and dioctyl sebacate.

8. A high-life cable for nuclear power according to claim 1, characterized in that, The palygorskite powder is intercalated modified palygorskite powder, and the raw materials of the intercalated modified palygorskite powder include palygorskite powder and hydroxyl-terminated polyethersulfone.

9. A high - life cable for nuclear power according to claim 8, characterized in that, The hydroxyl-terminated polyethersulfone is 9%-12% of the weight of the palygorskite powder.

10. A high - life cable for nuclear power according to claim 8, characterized in that, The preparation method of the intercalated modified palygorskite powder comprises the following steps: A1. Disperse the palygorskite powder in dimethylformamide, and disperse evenly to obtain a suspension; A2. Dissolve the hydroxyl-terminated polyethersulfone in dimethylformamide, and mix evenly to obtain a mixed solution; A3. Add the mixed solution to the suspension, mix evenly, concentrate, and dry to obtain the intercalated modified palygorskite powder.

Images