Green environment-friendly high-temperature-resistant 5G intelligent power cable and preparation method thereof

Abstract

The invention relates to the field of power cables, in particular to an environment-friendly high-temperature-resistant 5G intelligent power cable and a preparation method thereof. The cable comprises a conductor, a shielding layer, an insulating layer and a sheath layer, the conductor is wrapped by the shielding layer, the shielding layer is wrapped by the insulating layer, and the insulating layer is wrapped by the sheath layer; the conductor is tinned oxygen-free copper, the shielding layer is an aluminum foil shielding layer, the insulating layer is silicon rubber, and the sheath layer is prepared from a sheath material; the sheath material is composed of various components, has excellent high temperature resistance, and is green and environment-friendly. According to the prepared power cable, the high-temperature resistance and flame retardance of the power cable are improved through mutual cooperation of all the materials, the adopted materials are halogen-free materials, no toxic gas is released during combustion, the environment-friendly requirement is met, and the power cable is suitable for high-temperature and high-reliability application scenes.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power cables, in particular to a green and environmentally friendly high-temperature-resistant 5G intelligent power cable and a preparation method thereof. BACKGROUND

[0002] A power cable is a wire product that transmits power by wrapping a conductor with an insulating layer, mainly used in the main line or branch line of the power system, and has the functions of power transmission, distribution and protection. The core structure of the power cable includes a conductor, an insulating layer, a shielding layer and a protective layer.

[0003] Traditional power cable materials use polyvinyl chloride, which has low cost but contains halogen and releases toxic gases when burned. Traditional power cables are prone to thermal oxidative aging, have poor flame retardant performance, and are affected by mechanical stress cracking. Conventional temperature-resistant materials have poor long-term temperature resistance and cannot meet the demand for high-temperature environments. Therefore, there is an urgent need to invent a green and environmentally friendly high-temperature-resistant power cable that meets the requirements of green and environmentally friendly and can adapt to the demand for high-temperature extreme environments. SUMMARY

[0004] In view of the above technical deficiencies, the purpose of the present application is to provide a green and environmentally friendly high-temperature-resistant 5G intelligent power cable and a preparation method thereof, which meet the requirements of green and environmentally friendly, good flame retardant performance and excellent high-temperature resistance.

[0005] To achieve the above-mentioned purpose, the present application provides a green and environmentally friendly high-temperature-resistant 5G intelligent power cable, which comprises a conductor, a shielding layer, an insulating layer and a sheath layer. The conductor is wrapped with the shielding layer, the shielding layer is wrapped with the insulating layer, and the insulating layer is wrapped with the sheath layer.

[0006] The conductor is a tin-plated oxygen-free copper, the shielding layer is an aluminum foil shielding layer, the insulating layer is a silicone rubber, and the sheath layer is prepared from a sheath material.

[0007] The sheath material is prepared by the following steps:

[0008] S1, mix and stir nano-magnesium hydroxide and silane coupling agent, vacuum dry to obtain modified nano-magnesium hydroxide;

[0009] In the above reaction process, the amino group in the silane coupling agent molecule reacts with the hydroxyl group of the nano-magnesium hydroxide to form a stable chemical bond Mg-O-Si bond, forming a surface coating layer;

[0010] S2, dry the nitrile rubber and the silicone rubber respectively to obtain dried nitrile rubber and dried silicone rubber;

[0011] S3, mix the dried nitrile rubber and the dried silicone rubber, stir, then add polyacrylate and polyimide, heat and stir, then add an antioxidant, heat and stir to obtain a mixture A;

[0012] S4, the modified nanometer magnesium hydroxide, zinc borate, potassium titanate whisker are added into the mixture A in turn to stir to obtain a sheath material.

[0013] Further, the mass ratio between the nanometer magnesium hydroxide and the silane coupling agent is 100:2-4.

[0014] Further, the amount of the butyl nitrile rubber in the sheath material is 30-35wt%, and the amount of the silicone rubber in the sheath material is 20-25wt%.

[0015] Further, the amount of the polyacrylate in the sheath material is 15-20wt%, and the amount of the polyimide in the sheath material is 4-8wt%.

[0016] Further, the amount of the antioxidant in the sheath material is 2-5wt%.

[0017] Further, the amount of the modified nanometer magnesium hydroxide in the sheath material is 10-15wt%.

[0018] Further, the amount of the zinc borate in the sheath material is 2-5wt%, and the amount of the potassium titanate whisker in the sheath material is 2-5wt%.

[0019] A preparation method of a green and environment-friendly high-temperature-resistant 5G intelligent power cable, comprising the following steps:

[0020] A1, twisting tinned oxygen-free copper wires into a cable to obtain a conductor;

[0021] A2, wrapping an aluminum foil on the surface of the conductor to form a shielding layer;

[0022] A3, extruding cross-linked polyethylene outside the shielding layer by using an extruder to form an insulation layer;

[0023] A4, extruding a sheath material outside the insulation layer by using an extruder to obtain a green and environment-friendly high-temperature-resistant 5G intelligent power cable.

[0024] In summary, the present application has the following beneficial effects:

[0025] The power cable prepared in the application is sequentially provided with a conductor, a shielding layer coated on the surface of the conductor, an insulation layer coated on the surface of the shielding layer, and a protective sleeve layer coated on the surface of the insulation layer. The protective sleeve material is a sheath material, which is composed of multiple substances. The surface of the nano magnesium hydroxide is changed from hydrophilic to hydrophobic by modification, the interfacial tension in the polymer matrix is reduced, and the interfacial bonding force is improved. The surface of the nano magnesium hydroxide particles is coated with a coating layer by modifying the nano magnesium hydroxide with a silane coupling agent, which can inhibit the aggregation of nano particles through steric hindrance, make the particles more uniform, and the modified nano magnesium hydroxide is more likely to form a continuous magnesium oxide protective layer during combustion, which synergistically improves the flame retardant efficiency. Zinc borate, as an auxiliary flame retardant, cooperates with magnesium hydroxide to form a glassy magnesium borate layer to isolate oxygen and reduce smoke density. Potassium titanate whiskers can improve the tensile strength and impact resistance of the power cable and reduce the thermal expansion coefficient, forming a multi-level barrier layer with nano magnesium hydroxide. Polyimide improves the high-temperature stability of the material through rigid segments. Polyacrylate can enhance the weather resistance and chemical corrosion resistance of the material. Nitrile rubber provides excellent oil resistance and aging resistance, and imparts elasticity to the material, which can form a dynamic network structure with silicone rubber to improve the anti-creep ability of the material. Silicone rubber imparts wide temperature resistance to the material, and resists thermal oxidative aging through the stability of Si-O bond. The power cable prepared in the application improves the high-temperature resistance and flame retardance of the power cable through the mutual cooperation of the materials, and the materials used are halogen-free materials that do not release toxic gases during combustion, meeting environmental protection requirements and being suitable for high-temperature and high-reliability application scenarios. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0027] The raw materials involved in the specific embodiments of the present application are analytical pure. In addition, the nitrile rubber used is NBR-70; the silicone rubber is selected from Haining Hongxin Rubber and Plastic Products Co., Ltd. with the item number HX001; the average particle size of zinc borate is 3-5 μm; the diameter of potassium titanate whiskers is 0.8-1.2 μm, and the length is 30-50 μm; the polyimide is selected from Shenzhen Ruihuatai with the item number Kapton 03CR; the polyacrylate is selected from Hubei Yongchuang Pipe Industry with the item number MMP-110; the crosslinking process of crosslinked polyethylene is radiation crosslinking, and the crosslinking degree is 70%; the type of polyvinyl chloride is SG-3.

[0028] Example 1

[0029] The application discloses a green and environment-friendly high-temperature-resistant 5G intelligent power cable, which comprises a conductor, a shielding layer, an insulation layer and a sheath layer.

[0030] The conductor is tinned oxygen-free copper, the shielding layer is an aluminum foil shielding layer, the insulation layer is silicone rubber, and the sheath layer is prepared from a sheath material.

[0031] The sheath material is prepared through the following steps:

[0032] S1, nano-magnesium hydroxide (particle size 30 nm) and silane coupling agent (KH-550) are stirred in a high-speed mixer at a ratio of 100:3 (rotation speed 1200 r / min, time 20 min), and then vacuum dried at 80 DEG C for 2 h to obtain modified nano-magnesium hydroxide;

[0033] S2, nitrile rubber and silicone rubber are dried in a 80 DEG C air drying oven for 4 h to obtain dried nitrile rubber and dried silicone rubber;

[0034] S3, 30 parts of dried nitrile rubber and 20 parts of dried silicone rubber are mixed, and then stirred at 110 DEG C (rotation speed 300 rpm, time 5 min), then 15 parts of polyacrylate and 5 parts of polyimide are added, and the temperature is raised to 120 DEG C for stirring (rotation speed 300 rpm, time 8 min), then 5 parts of antioxidant 1035 are added, and the temperature is raised to 130 DEG C for stirring (rotation speed 300 rpm, time 15 min) to obtain mixture A;

[0035] S4, 15 parts of modified nano-magnesium hydroxide, 5 parts of zinc borate and 5 parts of potassium titanate whisker are sequentially added to mixture A and stirred (rotation speed 300 rpm, time 1 h) at 130 DEG C to obtain a sheath material.

[0036] The application discloses a preparation method of a green and environment-friendly high-temperature-resistant 5G intelligent power cable.

[0037] A1, 19 tinned oxygen-free copper wires with a diameter of 2 mm are stranded into a cable to obtain a conductor;

[0038] A2, an aluminum foil is wrapped around the conductor to form a shielding layer, the wrapping overlap rate is 30%, and the wrapping angle is 45 DEG ;

[0039] A3, crosslinked polyethylene is extruded outside the shielding layer by using an extruder (the temperatures of the first zone, the second zone and the third zone of the cylinder are set to 150 DEG C, 160 DEG C and 180 DEG C respectively, and the temperature of the head is set to 170 DEG C), the thickness is 1.5 mm, the pulling speed is 2 m / min, and then water cooling is carried out at 70 DEG C to form an insulation layer;

[0040] A4, the sheath material is extruded on the outside of the insulation layer by an extruder (the temperature of the first zone, the second zone and the third zone of the cylinder is set to 170℃, 210℃ and 235℃, and the temperature of the head is set to 240℃), the thickness is 5mm, the pulling speed is 10m / min, and then water cooling at 70℃ is performed to obtain the green and environmentally friendly high-temperature-resistant 5G intelligent power cable.

[0041] Example 2

[0042] A green and environmentally friendly high-temperature-resistant 5G intelligent power cable comprises a conductor, a shielding layer, an insulation layer and a sheath layer, the conductor is wrapped with the shielding layer, the shielding layer is wrapped with the insulation layer, and the insulation layer is wrapped with the sheath layer.

[0043] The conductor is tinned oxygen-free copper, the shielding layer is an aluminum foil shielding layer, the insulation layer is silicone rubber, and the sheath layer is prepared from a sheath material.

[0044] The sheath material is prepared by the following steps:

[0045] S1, nano-magnesium hydroxide (particle size 30nm) and silane coupling agent (KH-550) are stirred in a high-speed mixer at a ratio of 100:3 (rotation speed 1200r / min, time 20min), and then vacuum dried at 80℃ for 2h to obtain modified nano-magnesium hydroxide;

[0046] S2, the nitrile rubber and the silicone rubber are dried in a 80℃ air drying oven for 4h to obtain dried nitrile rubber and dried silicone rubber;

[0047] S3, 32 parts of dried nitrile rubber and 22 parts of dried silicone rubber are mixed, then stirred at 110℃ (rotation speed 300rpm, time 5min), then 18 parts of polyacrylate and 8 parts of polyimide are added, and the temperature is raised to 120℃ for stirring (rotation speed 300rpm, time 8min), then 4 parts of antioxidant 1035 are added, and the temperature is raised to 130℃ for stirring (rotation speed 300rpm, time 15min) to obtain mixture A;

[0048] S4, 13 parts of modified nano-magnesium hydroxide, 3 parts of zinc borate and 3 parts of potassium titanate whisker are sequentially added to mixture A and stirred at 130℃ (rotation speed 300rpm, time 1h) to obtain a sheath material.

[0049] A method for preparing a green and environmentally friendly high-temperature-resistant 5G intelligent power cable comprises the following steps:

[0050] A1, 19 tinned oxygen-free copper wires with a diameter of 2mm are twisted into a cable to obtain a conductor;

[0051] A2, aluminum foil is wrapped around the conductor to form a shielding layer, the wrapping overlap rate is 30%, and the wrapping angle is 45°;

[0052] A3, cross-linked polyethylene is extruded outside the shielding layer by an extruder (the temperature of the first zone, the second zone and the third zone of the cylinder is set to 150℃, 160℃ and 180℃, and the temperature of the head is set to 170℃), the thickness is 1.5mm, the pulling rate is 2m / min, and then water cooling is performed at 70℃, so as to form an insulation layer;

[0053] A4, the sheath material is extruded outside the insulation layer by an extruder (the temperature of the first zone, the second zone and the third zone of the cylinder is set to 170℃, 210℃ and 235℃, and the temperature of the head is set to 240℃), the thickness is 5mm, the pulling rate is 10m / min, and then water cooling is performed at 70℃, so as to obtain the green and environment-friendly high-temperature-resistant 5G intelligent power cable.

[0054] Example 3

[0055] A green and environment-friendly high-temperature-resistant 5G intelligent power cable, comprising a conductor, a shielding layer, an insulation layer and a sheath layer, the conductor is wrapped by the shielding layer, the shielding layer is wrapped by the insulation layer, and the insulation layer is wrapped by the sheath layer.

[0056] The conductor is tinned oxygen-free copper, the shielding layer is an aluminum foil shielding layer, the insulation layer is silicone rubber, and the sheath layer is prepared from a sheath material.

[0057] The sheath material is prepared by the following steps:

[0058] S1, nano-magnesium hydroxide (particle size 30nm) and silane coupling agent (KH-550) are stirred in a high-speed mixer at a ratio of 100:3 (rotation speed 1200r / min, time 20min), and then vacuum dried at 80℃ for 2h to obtain modified nano-magnesium hydroxide;

[0059] S2, nitrile rubber and silicone rubber are dried in a 80℃ air drying oven for 4h to obtain dried nitrile rubber and dried silicone rubber;

[0060] S3, 35 parts of dried nitrile rubber and 25 parts of dried silicone rubber are mixed, and then stirred at 110℃ (rotation speed 300rpm, time 5min), then 20 parts of polyacrylate and 4 parts of polyimide are added, and the temperature is raised to 120℃ for stirring (rotation speed 300rpm, time 8min), then 2 parts of antioxidant 1035 are added, and the temperature is raised to 130℃ for stirring (rotation speed 300rpm, time 15min) to obtain mixture A;

[0061] S4, 10 parts of modified nano-magnesium hydroxide, 2 parts of zinc borate and 2 parts of potassium titanate whisker are sequentially added to mixture A and stirred (rotation speed 300rpm, time 1h) at 130℃ to obtain a sheath material.

[0062] A kind of green environmental protection high temperature resistant 5G intelligent power cable preparation method, comprising the following steps:

[0063] A1, 19 2mm tinned oxygen-free copper wire is stranded into cable, and conductor is obtained;

[0064] A2, aluminum foil is wrapped around the surface of conductor to form shielding layer, wrapping overlap rate is 30%, and wrapping angle is 45 °;

[0065] A3, crosslinked polyethylene is extruded outside shielding layer using extruder (temperature of barrel zone one, barrel zone two and barrel zone three is set to 150 DEG C, 160 DEG C, 180 DEG C, and temperature of head is set to 170 DEG C), thickness is 1.5mm, and traction rate is 2m / min, then water cooling is carried out at 70 DEG C, and insulation layer is formed;

[0066] A4, sheath material is extruded outside insulation layer using extruder (temperature of barrel zone one, barrel zone two and barrel zone three is set to 170 DEG C, 210 DEG C, 235 DEG C, and temperature of head is set to 240 DEG C), thickness is 5mm, and traction rate is 10m / min, then water cooling is carried out at 70 DEG C, and green environmental protection high temperature resistant 5G intelligent power cable is obtained.

[0067] Comparative example 1

[0068] The difference between the present comparative example and example 2 is that the sheath layer material is polyvinyl chloride.

[0069] Comparative example 2

[0070] A kind of green environmental protection high temperature resistant 5G intelligent power cable, including conductor, shielding layer, insulation layer and sheath layer, conductor is wrapped with shielding layer, shielding layer is wrapped with insulation layer, and insulation layer is wrapped with sheath layer;

[0071] The conductor is tinned oxygen-free copper, the shielding layer is aluminum foil shielding layer, the insulation layer is silicone rubber, and the sheath layer is prepared from sheath material;

[0072] The sheath material is prepared by the following steps:

[0073] S1, nano magnesium hydroxide (particle size 30nm) and silane coupling agent (KH-550) are stirred in high-speed blender (speed 1200r / min, time 20min) at a ratio of 100:3, then vacuum drying is carried out at 80 DEG C for 2h, and modified nano magnesium hydroxide is obtained;

[0074] S2, nitrile rubber and silicone rubber are dried in 80 DEG C's air blast drying oven for 4h, and dried nitrile rubber and dried silicone rubber are obtained;

[0075] S3, 40 parts of dried nitrile rubber and 20 parts of dried silicone rubber are mixed, then stirred at 110°C (rotation speed 300 rpm, time 5 min), then 20 parts of polyacrylate and 4 parts of polyimide are added, and stirred at 120°C (rotation speed 300 rpm, time 8 min), then 2 parts of antioxidant 1035 are added, and stirred at 130°C (rotation speed 300 rpm, time 15 min) to obtain mixture A;

[0076] S4, 5 parts of modified nano magnesium hydroxide, 1 part of zinc borate, and 2 parts of potassium titanate whisker are sequentially added to mixture A and stirred at 130°C (rotation speed 300 rpm, time 1 h) to obtain a sheath material.

[0077] A method for preparing a green and environmentally friendly high-temperature-resistant 5G intelligent power cable, comprising the following steps:

[0078] A1, 19 2mm tinned oxygen-free copper wires are stranded into a cable to obtain a conductor;

[0079] A2, an aluminum foil is wrapped around the conductor to form a shielding layer, the wrapping overlap rate is 30%, and the wrapping angle is 45°;

[0080] A3, cross-linked polyethylene is extruded on the outside of the shielding layer using an extruder (the temperatures of the first zone, the second zone, and the third zone of the cylinder are set to 150°C, 160°C, and 180°C, and the temperature of the head is set to 170°C), the thickness is 1.5mm, the pulling rate is 2m / min, and then water cooling is performed at 70°C to form an insulation layer;

[0081] A4, the sheath material is extruded on the outside of the insulation layer using an extruder (the temperatures of the first zone, the second zone, and the third zone of the cylinder are set to 170°C, 210°C, and 235°C, and the temperature of the head is set to 240°C), the thickness is 5mm, the pulling rate is 10m / min, and then water cooling is performed at 70°C to obtain a green and environmentally friendly high-temperature-resistant 5G intelligent power cable.

[0082] Performance test

[0083] The power cables prepared in Examples 1-3 and Comparative Examples 1-2 are subjected to functional tests. The flame retardant performance and high temperature resistance are measured respectively.

[0084] Flame retardant performance test: the oxygen index is measured according to the method of GB / T 2406.2-2009 "Determination of Combustion Behavior of Plastics by Oxygen Index Method"; a high temperature aging oven is used, and the appearance change after high temperature aging is observed, and the tensile strength change rate is measured by a tensile testing machine (ASTM D412 is used). The results are shown in Table 1:

[0085] Table 1

[0086]

[0087] From Table 1, it can be seen that the power cable prepared in Example 1-3 of the present application has good test results, and the power cable prepared in Example 2 has the best test results; the difference between Comparative Example 1 and Example 2 is that the sheath layer material is polyvinyl chloride, and the test results show that the appearance of the power cable prepared in Comparative Example 1 is deformed and has micro-cracks, and the tensile strength after aging is not as good as that of Example 2, the limiting oxygen index is lower than that of Example 2, and the flame-retardant effect is not as good as that of Example 2; the difference between Comparative Example 2 and Example 3 is that the content of each component of the sheath material is changed, and the test results show that the tensile strength after aging is not as good as that of Example 3. In summary, the power cable prepared in the examples of the present application has excellent high-temperature resistance and flame-retardant performance, and the power cable prepared in Example 2 has the best effect, and the best embodiment of the present application is Example 2.

[0088] The above is only an example and description of the concept of the present application, and those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as they do not deviate from the concept of the invention or exceed the scope defined by the present claims, and they should belong to the protection scope of the present application.

Claims

1. A green, environmentally friendly, high-temperature resistant 5G intelligent power cable, characterized in that: It includes a conductor, a shielding layer, an insulating layer and a sheath layer, wherein the conductor is wrapped with a shielding layer, the shielding layer is wrapped with an insulating layer, and the insulating layer is wrapped with a sheath layer; The conductor is tinned oxygen-free copper, the shielding layer is an aluminum foil shielding layer, the insulating layer is silicone rubber, and the sheath layer is made of sheath material; The sheath material is prepared by the following steps: S1, mixing nano magnesium hydroxide and a silane coupling agent, and vacuum drying to obtain modified nano magnesium hydroxide; S2, drying the nitrile rubber and the silicone rubber respectively to obtain dried nitrile rubber and dried silicone rubber; S3, mixing the dried nitrile rubber and the dried silicone rubber, stirring, then adding polyacrylate and polyimide, heating and stirring, then adding an antioxidant, heating and stirring, to obtain a mixture A; S4. Add modified nano magnesium hydroxide, zinc borate, and potassium titanate whiskers to mixture A in sequence and stir to obtain a sheath material.

2. A green, environmentally friendly, high-temperature resistant 5G intelligent power cable according to claim 1, characterized in that: The mass ratio of the nano magnesium hydroxide to the silane coupling agent is 100:2-4.

3. The green, environmentally friendly, high-temperature resistant 5G intelligent power cable according to claim 1, characterized in that: The amount of the nitrile rubber in the sheath material is 30-35 wt %, and the amount of the silicone rubber in the sheath material is 20-25 wt %.

4. The green, environmentally friendly, high-temperature resistant 5G intelligent power cable according to claim 1, characterized in that: The amount of the polyacrylate in the sheath material is 15-20 wt %, and the amount of the polyimide in the sheath material is 4-8 wt %.

5. The green, environmentally friendly, high-temperature resistant 5G intelligent power cable according to claim 1, characterized in that: The amount of the antioxidant in the sheath material is 2-5 wt%.

6. The green, environmentally friendly, high-temperature resistant 5G intelligent power cable according to claim 1, characterized in that: The amount of the modified nano magnesium hydroxide in the sheath material is 10-15 wt%.

7. The green, environmentally friendly, high-temperature resistant 5G intelligent power cable according to claim 1, characterized in that: The amount of zinc borate in the sheath material is 2-5 wt%, and the amount of potassium titanate whiskers in the sheath material is 2-5 wt%.

8. A method for preparing the green, environmentally friendly, high-temperature resistant 5G intelligent power cable according to any one of claims 1 to 7, characterized in that: The following steps are involved: A1. Twist tinned oxygen-free copper wires into a cable to obtain a conductor; A2. Wrap aluminum foil around the conductor surface to form a shielding layer; A3. Use an extruder to extrude cross-linked polyethylene onto the shielding layer to form an insulating layer; A4. Use an extruder to extrude the sheath material onto the outside of the insulation layer to obtain a green, environmentally friendly, high-temperature resistant 5G intelligent power cable.

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