Waterproof compression-resistant aluminum alloy flexible cable and preparation method thereof

Abstract

The invention discloses a waterproof compression-resistant aluminum alloy flexible cable and a preparation method thereof. The flexible cable comprises an insulating layer, a compression-resistant flexible layer and a waterproof layer which are sequentially arranged on a cable core in a sleeving mode from inside to outside. The cable core is made of aluminum alloy, the compression-resistant flexible layer is of a honeycomb structure, and the honeycomb structure comprises a honeycomb frame and a connecting face located on the honeycomb frame. According to the method, the compression-resistant flexible layer of the honeycomb structure is adopted, and the composite material of the carbon fibers and the polyurethane and the aramid fiber honeycomb soaked with the epoxy resin are combined, so that the waterproof performance and the compression-resistant performance are improved; and the pressure-resistant flexible layer is sheared into a strip shape and is wound outside the insulating layer, so that the production efficiency can be improved and the uniform distribution of the pressure-resistant layer can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible cables, and specifically relates to a waterproof and compression-resistant aluminum alloy flexible cable and a preparation method thereof. Background Art

[0002] The wire and cable industry is an important supporting industry for China's economic construction and is widely used in various fields of the national economy. Wire and cable are essential basic materials for transmitting electric energy, transmitting information, and manufacturing various motors, electrical appliances, instruments, automobiles, machine tools, etc. With the rapid growth of China's economy and the further acceleration of the industrialization and urbanization processes, the wire and cable industry in China has developed rapidly. Among the sub-sectors of the machinery industry, the output value scale of the wire and cable manufacturing industry accounts for one-fourth of the electrical and electronic industry and is the second largest industry in the machinery industry after the automotive industry, occupying an important position in the national economy. In recent years, with the continuous and rapid development of China's economy and the advancement of the urbanization process, the construction of major projects such as large power stations, west-to-east power transmission, and power grid renovation all indicate that the wire and cable industry has a relatively long boom cycle. Flexible cables usually use aluminum alloy as the conductor material, which has excellent electrical conductivity and corrosion resistance. At the same time, its structure includes a high-quality insulating layer, a shielding layer, and a waterproof sheath layer, which together form a stable and reliable cable system. The waterproof sheath layer ensures the normal operation of the cable in a humid or underwater environment.

[0003] However, there are also certain problems with aluminum alloy flexible cables in terms of waterproofing and compression resistance. On the one hand, although the waterproof performance of aluminum alloy cables is excellent, the lag of standards and the disconnection between design specifications and cable standards limit their wide application. For example, although the current national cable standards allow the use of aluminum alloy materials as conductors, the specific regulations on aluminum alloy conductors are not detailed, such as alloy composition, compression creep detection, etc., which may affect the compression resistance of the cable. On the other hand, compared with copper cables, aluminum alloy cables still have a certain gap in some technical indicators such as tensile strength and creep resistance, which may impose certain limitations on the use of the cable in extreme environments. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a waterproof and compression-resistant aluminum alloy flexible cable and a preparation method thereof.

[0005] A waterproof and compression-resistant aluminum alloy flexible cable, the flexible cable includes an insulating layer, a compression-resistant flexible layer, and a waterproof layer that are sequentially sleeved on the cable core from the inside to the outside; the cable core uses aluminum alloy, the compression-resistant flexible layer uses a honeycomb structure, the honeycomb structure includes a honeycomb frame and a connecting surface located on the honeycomb frame; the raw materials of the connecting surface include carbon fiber and polyurethane with a mass ratio of 1:2-4, and the raw material of the honeycomb frame is aramid honeycomb impregnated with epoxy resin; the insulating layer, the compression-resistant flexible layer, and the waterproof layer are sequentially bonded by an adhesive.

[0006] Description: By adopting a compression-resistant flexible layer with a honeycomb structure, combining a composite material of carbon fiber and polyurethane and aramid honeycombs impregnated with epoxy resin, and firmly bonding each layer with an adhesive, this cable significantly improves its waterproof and compression-resistant properties while maintaining lightweight and high flexibility.

[0007] Furthermore, the thickness ratio of the insulation layer, the compression-resistant flexible layer, and the waterproof layer is 1:2 - 5:1 - 2.

[0008] Description: Through the reasonable allocation of the thickness of each layer, the above ratio can optimize the weight and flexibility of the cable while ensuring the overall performance of the cable.

[0009] Furthermore, the insulation layer is obtained by compounding cross-linked polyethylene, silicone rubber, and short glass fibers with a mass ratio of 2:2 - 3:1.

[0010] Description: Cross-linked polyethylene provides good electrical insulation performance and heat resistance, silicone rubber endows the material with excellent flexibility and weather resistance, while short glass fibers enhance the mechanical strength and impact resistance of the material. The composite material obtained from the above raw material ratio enables the insulation layer to have higher mechanical strength and better environmental adaptability while maintaining good insulation performance, thereby improving the overall performance and reliability of the cable.

[0011] Furthermore, the preparation method of the insulation layer includes:

[0012] First, at 20 - 25°C, cross-linked polyethylene, silicone rubber, and short glass fibers are mixed in a high-speed mixer at a speed of 800 - 1200 r / min for 10 - 15 min to obtain a preliminary mixture;

[0013] The preliminary mixture is put into an ultrasonic generator, deionized water with a mass fraction of 10 - 13% of the preliminary mixture is added, and then ultrasonic mixing is carried out at a frequency of 20 - 40 kHz for 10 - 20 min; then it is dried until the water volatilizes completely to obtain a secondary mixture;

[0014] Then, the secondary mixture is fed into an extruder and heated and melted at a temperature of 160 - 200°C, and then extruded and pressed at a screw speed of 10 - 50 r / min of the extruder to obtain the insulation layer.

[0015] Description: Through the above-mentioned steps of hybrid treatment, the uniform distribution of cross-linked polyethylene, silicone rubber, and short glass fibers in the insulating layer is ensured, improving the material's uniformity and consistency. Ultrasonic-assisted mixing further enhances the dispersion effect of the material, while extrusion molding guarantees the shape and dimensional accuracy of the insulating layer. This refined preparation method helps improve the electrical properties, mechanical strength, and environmental resistance of the insulating layer.

[0016] Furthermore, the aramid honeycomb is honeycomb-shaped aramid paper; the preparation method of the compressive flexible layer includes:

[0017] S1-1: Immerse the aramid honeycomb in epoxy resin. After impregnation for 2 - 3 hours, first let it stand and cure at a temperature of 70 - 80 °C for 2 - 3 hours, and then completely cure at a temperature of 150 - 160 °C for 1 - 2 hours to obtain a honeycomb framework;

[0018] S1-2: Cut the carbon fiber to a length of 0.05 - 0.1 mm. Then, take carbon fiber and polyurethane resin in a mass ratio of 1:4 and mix them evenly using a high-speed mixer to obtain a first composite material; then take carbon fiber and polyurethane resin in a mass ratio of 1:2 and mix them evenly using a high-speed mixer to obtain a second composite material;

[0019] S1-3: Using the screen printing method, coat the first composite material on the upper surface of the honeycomb framework. Then, send the second composite material into an extruder to heat and melt it, and then extrude to obtain a connection surface. Then, compound the connection surface with the lower surface of the honeycomb framework to obtain a compressive flexible layer; the ratio of the coating thickness of the first composite material, the thickness of the aramid honeycomb, and the thickness of the connection surface is 1:1.3 - 1.5:0.8 - 1.

[0020] Description: The above method ensures the uniform impregnation and curing of the honeycomb framework, as well as the uniform mixing and distribution of carbon fiber and polyurethane resin through step-by-step treatment and precise control; the combination of the screen printing method and extrusion molding makes the compounding of the connection surface and the honeycomb framework more firm. At the same time, by controlling the thickness ratio of each layer, the mechanical properties and overall stability of the compressive flexible layer are optimized, which helps improve the compressive strength, flexibility, and durability of the compressive flexible layer.

[0021] Furthermore, in S1-3, the method of compounding the connection surface with the lower surface of the honeycomb framework is either heating or bonding with an adhesive.

[0022] Description: The above-mentioned heat compounding can improve the bonding strength between materials, while bonding with an adhesive can provide better operability and adaptability.

[0023] Furthermore, the temperature of the heat compounding is 90 - 140 °C.

[0024] Description: The above temperature parameters ensure the best bonding effect between the connection surface and the honeycomb frame during lamination.

[0025] Furthermore, the waterproof layer is made of silicone rubber.

[0026] Description: Silicone rubber has excellent waterproof performance, good flexibility and weather resistance.

[0027] The present invention also provides a method for preparing a waterproof and compression-resistant aluminum alloy flexible cable, which includes the following steps:

[0028] S1. First, by the hot extrusion method, at a temperature of 160 - 200 °C, wrap the insulating layer on the cable core.

[0029] S2. Then, at a temperature of 60 - 80 °C, cut the compression-resistant flexible layer into strips, apply an adhesive on the side of the honeycomb frame of the compression-resistant flexible layer coated with the first composite material and bond it to the insulating layer, and wind the compression-resistant flexible layer around the insulating layer.

[0030] S3. Then, by the hot extrusion method, at a temperature of 150 - 170 °C, wrap the waterproof layer outside the compression-resistant flexible layer to obtain the flexible cable.

[0031] Description: By using an extrusion die to wrap the insulating layer and the waterproof layer, the uniformity and thickness consistency of the materials can be ensured; cutting the compression-resistant flexible layer into strips and winding it around the insulating layer can improve production efficiency and ensure the uniform distribution of the compression-resistant layer.

[0032] Furthermore, the adhesive is a silicone rubber-based adhesive.

[0033] Description: The silicone rubber-based adhesive has excellent heat resistance and weather resistance, good flexibility and electrical insulation performance.

[0034] The beneficial effects of the present invention are:

[0035] By adopting a compression-resistant flexible layer with a honeycomb structure, combining a composite material of carbon fiber and polyurethane and an aramid honeycomb impregnated with epoxy resin, and firmly bonding each layer through an adhesive, this cable significantly improves its waterproof and compression-resistant performance while maintaining lightweight and high flexibility; by using an extrusion die to wrap the insulating layer and the waterproof layer, the uniformity and thickness consistency of the materials can be ensured; cutting the compression-resistant flexible layer into strips and winding it around the insulating layer can improve production efficiency and ensure the uniform distribution of the compression-resistant layer. Brief Description of the Drawings

[0036] Figure 1 It is a performance comparison data graph of the flexible cables obtained in Example 1, Comparative Example 1 - Comparative Example 4 of the present invention. Detailed Description

[0037] To further illustrate the methods adopted and the effects achieved by the present invention, the technical solutions of the present invention will be clearly and completely described below in combination with experiments.

[0038] Example 1: A waterproof and compression-resistant aluminum alloy flexible cable. The flexible cable includes an insulating layer, a compression-resistant flexible layer, and a waterproof layer that are sequentially sleeved on the cable core from the inside to the outside. The cable core is made of aluminum alloy, the compression-resistant flexible layer adopts a honeycomb structure, and the honeycomb structure includes a honeycomb frame and a connection surface located on the honeycomb frame. The raw materials of the connection surface include carbon fiber and polyurethane with a mass ratio of 1:3, and the raw material of the honeycomb frame is aramid honeycomb impregnated with epoxy resin. The insulating layer, the compression-resistant flexible layer, and the waterproof layer are bonded by an adhesive. The thickness ratio of the insulating layer, the compression-resistant flexible layer, and the waterproof layer is 1:3:1.5. The adhesive is a silicone rubber-based adhesive, and specifically, it is the commercially available E41 type adhesive in this example.

[0039] The insulating layer is obtained by compounding cross-linked polyethylene, silicone rubber, and short glass fibers with a mass ratio of 2:2.5:1. The preparation method of the insulating layer includes:

[0040] First, at 22°C, cross-linked polyethylene, silicone rubber, and short glass fibers are mixed in a high-speed mixer at a speed of 1000 r / min for 12 min to obtain a preliminary mixture.

[0041] The preliminary mixture is put into an ultrasonic generator, and deionized water with a mass fraction of 12% of the preliminary mixture is added. Then, ultrasonic mixing is carried out at a frequency of 30 kHz for 15 min. After drying until the water volatilizes completely, a secondary mixture is obtained.

[0042] Then, the secondary mixture is fed into an extruder and heated and melted at a temperature of 180°C, and then extruded and pressed at a screw speed of 30 r / min of the extruder to obtain the insulating layer.

[0043] The aramid honeycomb is honeycomb-shaped aramid paper. The preparation method of the compression-resistant flexible layer includes:

[0044] S1-1: Immerse the aramid honeycomb in epoxy resin. After 2.5 h of immersion, first stand and cure at a temperature of 75°C for 2.5 h, and then completely cure at a temperature of 155°C for 1.5 h to obtain the honeycomb frame.

[0045] S1-2. Cut the carbon fiber to a length of 0.08 mm, then take carbon fiber and polyurethane resin in a mass ratio of 1:4, mix them using a high-speed mixer until evenly mixed to obtain a first composite material; then take carbon fiber and polyurethane resin in a mass ratio of 1:2, mix them using a high-speed mixer until evenly mixed to obtain a second composite material;

[0046] S1-3. Apply the first composite material on the upper surface of the honeycomb frame by screen printing method, then feed the second composite material into an extruder to heat and melt it and then extrude to obtain a connecting surface, and then heat and bond the connecting surface with the lower surface of the honeycomb frame to obtain a compressive flexible layer; the ratio of the coating thickness of the first composite material, the aramid honeycomb thickness, and the connecting surface thickness is 1:1.4:0.9; the temperature of the heat bonding is 100 °C;

[0047] The preparation method of the waterproof and compressive aluminum alloy flexible cable includes the following steps:

[0048] S1. First, by hot extrusion method, at a temperature of 180 °C, wrap the insulating layer on the cable core;

[0049] S2. Then, at a temperature of 70 °C, cut the compressive flexible layer into strips, apply an adhesive on the side of the honeycomb frame of the compressive flexible layer coated with the first composite material and bond it with the insulating layer, and wind the compressive flexible layer around the insulating layer;

[0050] S3. Then, by hot extrusion method, at a temperature of 160 °C, wrap the waterproof layer around the compressive flexible layer to obtain the flexible cable.

[0051] Example 2: The difference between this example and Example 1 is that the thicknesses of each layer are different, and the thickness ratio of the insulating layer, the compressive flexible layer, and the waterproof layer is 1:2:2.

[0052] Example 3: The difference between this example and Example 1 is that the thicknesses of each layer are different, and the thickness ratio of the insulating layer, the compressive flexible layer, and the waterproof layer is 1:5:1.

[0053] Example 4: The difference between this example and Example 1 is that the raw material of the connecting surface includes carbon fiber and polyurethane in a mass ratio of 1:2.

[0054] Example 5: The difference between this example and Example 1 is that the raw material of the connecting surface includes carbon fiber and polyurethane in a mass ratio of 1:4.

[0055] Example 6: The difference between this example and Example 1 is that the insulating layer is obtained by compounding cross-linked polyethylene, silicone rubber, and short glass fibers in a mass ratio of 2:2:1.

[0056] Example 7: The difference between this example and Example 1 is that the insulating layer is obtained by compounding cross-linked polyethylene, silicone rubber, and short glass fibers with a mass ratio of 2:3:1.

[0057] Example 8: The difference between this example and Example 1 is that the preparation method of the insulating layer includes:

[0058] First, at 20 °C, cross-linked polyethylene, silicone rubber, and short glass fibers are mixed in a high-speed mixer at a speed of 1200 r / min for 10 min to obtain a preliminary mixture;

[0059] The preliminary mixture is put into an ultrasonic generator, deionized water with a mass fraction of 13% of the preliminary mixture is added, and then ultrasonic mixing is carried out at a frequency of 20 kHz for 10 min; then it is dried until the water volatilizes completely to obtain a secondary mixture;

[0060] Then, the secondary mixture is fed into an extruder and heated and melted at a temperature of 160 °C, and then extruded and pressed at a screw speed of 50 r / min of the extruder to obtain the insulating layer.

[0061] Example 9: The difference between this example and Example 1 is that the preparation method of the insulating layer includes:

[0062] First, at 25 °C, cross-linked polyethylene, silicone rubber, and short glass fibers are mixed in a high-speed mixer at a speed of 1200 r / min for 15 min to obtain a preliminary mixture;

[0063] The preliminary mixture is put into an ultrasonic generator, deionized water with a mass fraction of 10-13% of the preliminary mixture is added, and then ultrasonic mixing is carried out at a frequency of 40 kHz for 20 min; then it is dried until the water volatilizes completely to obtain a secondary mixture;

[0064] Then, the secondary mixture is fed into an extruder and heated and melted at a temperature of 200 °C, and then extruded and pressed at a screw speed of 10 r / min of the extruder to obtain the insulating layer.

[0065] Example 10: The difference between this example and Example 1 is that the ratio of the coating thickness, aramid honeycomb thickness, and connection surface thickness is 1:1.3; 0.8.

[0066] Example 11: The difference between this example and Example 1 is that the ratio of the coating thickness, aramid honeycomb thickness, and connection surface thickness is 1:1.5; 1.

[0067] Example 12: The difference between this example and Example 1 is that the preparation method of the compressive flexible layer includes:

[0068] S1-1. Immerse the aramid honeycomb in epoxy resin. After 2 hours of immersion, first let it stand and cure at 70 °C for 3 hours, and then completely cure at 160 °C for 2 hours to obtain a honeycomb frame;

[0069] S1-2. Cut the carbon fiber to a length of 0.05 mm, then take carbon fiber and polyurethane resin in a mass ratio of 1:4 and mix them evenly using a high-speed mixer to obtain a first composite material; then take carbon fiber and polyurethane resin in a mass ratio of 1:2 and mix them evenly using a high-speed mixer to obtain a second composite material;

[0070] S1-3. Coat the first composite material on the upper surface of the honeycomb frame by screen printing method, then send the second composite material into an extruder to heat and melt it and then extrude to obtain a connecting surface, and then heat and compound the connecting surface with the lower surface of the honeycomb frame to obtain a compressive flexible layer.

[0071] Example 13: The difference between this example and Example 1 is that the preparation method of the compressive flexible layer includes:

[0072] S1-1. Immerse the aramid honeycomb in epoxy resin. After 3 hours of immersion, first let it stand and cure at 80 °C for 2 hours, and then completely cure at 150 °C for 1 hour to obtain a honeycomb frame;

[0073] S1-2. Cut the carbon fiber to a length of 0.1 mm, then take carbon fiber and polyurethane resin in a mass ratio of 1:4 and mix them evenly using a high-speed mixer to obtain a first composite material; then take carbon fiber and polyurethane resin in a mass ratio of 1:2 and mix them evenly using a high-speed mixer to obtain a second composite material;

[0074] S1-3. Coat the first composite material on the upper surface of the honeycomb frame by screen printing method, then send the second composite material into an extruder to heat and melt it and then extrude to obtain a connecting surface, and then heat and compound the connecting surface with the lower surface of the honeycomb frame to obtain a compressive flexible layer.

[0075] Example 14: The difference between this example and Example 1 is that the temperature of the heat compounding is 90 °C.

[0076] Example 15: The difference between this example and Example 1 is that the temperature of the heat compounding is 140 °C.

[0077] Example 16: The difference between this example and Example 1 is that the preparation parameters of the flexible cable are different,

[0078] S1. First, by means of hot extrusion, at a temperature of 160 °C, wrap the insulating layer around the cable core;

[0079] S2. Then, at a temperature of 60 °C, shear the compressive flexible layer into strips, apply an adhesive on the side of the honeycomb frame of the compressive flexible layer coated with the first composite material and bond it to the insulating layer, and wind the compressive flexible layer around the insulating layer;

[0080] S3. Then, by means of hot extrusion, at a temperature of 150 °C, wrap the waterproof layer around the compressive flexible layer to obtain the flexible cable.

[0081] Example 17: The difference between this example and Example 1 lies in the different preparation parameters of the flexible cable.

[0082] S1. First, by means of hot extrusion, at a temperature of 200 °C, wrap the insulating layer around the cable core;

[0083] S2. Then, at a temperature of 80 °C, shear the compressive flexible layer into strips, apply an adhesive on the side of the honeycomb frame of the compressive flexible layer coated with the first composite material and bond it to the insulating layer, and wind the compressive flexible layer around the insulating layer;

[0084] S3. Then, by means of hot extrusion, at a temperature of 170 °C, wrap the waterproof layer around the compressive flexible layer to obtain the flexible cable.

[0085] Example 18: The difference between this example and Example 1 is that in S1-3, the method of compounding the connection surface with the lower surface of the honeycomb frame adopts adhesive bonding.

[0086] Experimental example: The description basis of this experimental example is the recorded scheme in Example 1, aiming to clarify the actual application effect of the present invention.

[0087] Experimental example: I. Conduct tensile strength tests and longitudinal fracture elongation rate tests on the flexible cables obtained in Examples 1 to 18 respectively; the test results are as follows:

[0088] 1. Explore the influence of different treatment methods on the performance of flexible cables;

[0089] Comparative example 1: The difference from Example 1 is that the compressive flexible layer is not used, and an insulating layer with the same thickness is used instead of the compressive flexible layer;

[0090] Comparative example 2: The difference from Example 1 is that the aramid honeycomb is not soaked and directly used as the compressive flexible layer;

[0091] Comparative Example 3: The difference from Example 1 is that the screen printing method of S1-3 is not adopted, and the honeycomb frame is directly bonded to the second composite material to obtain a compressive flexible layer;

[0092] Comparative Example 4: The difference from Example 1 is that the insulating layer uses cross-linked polyethylene;

[0093] Examples 1, Comparative Examples 1 to 4 were taken for comparison, as shown in Table 1 and Figure 1 shown;

[0094] Table 1 Experimental results of the performance of flexible cables with different treatment methods

[0095]

[0096] It can be seen from Table 1 that by comparing Example 1 with Comparative Example 1, the compressive flexible layer adopted in Example 1 of the present invention has good effects on various properties of the flexible cable. Especially, the compressive amount has a significant increase and can ensure a high tensile strength. The reason may be that the honeycomb structure combines the composite material of carbon fiber and polyurethane and the aramid honeycomb impregnated with epoxy resin, which can ensure the compressive performance while maintaining light weight and high flexibility. In comparison, although the material of Comparative Example 1 can ensure a certain compressive strength and elongation at break, the compressive amount is low, which limits its use. Therefore, the solution of Example 1 is more preferable.

[0097] By comparing Example 1 with Comparative Example 2, it can be seen that compared with the method of directly bonding the honeycomb frame to the second composite material to obtain a compressive flexible layer without using the screen printing method of S1-3 in Comparative Example 2, the preparation steps of the compressive flexible layer in Example 1 are more practical, and the preparation method of Example 1 can better improve the various properties of the cable material.

[0098] By comparing Example 1 with Comparative Example 3, it can be found that compared with the method of directly bonding the honeycomb frame to the second composite material to obtain a compressive flexible layer without using the screen printing method of S1-3 in Comparative Example 3, the preparation method in Example 1 is more preferable. The reason may be that the screen printing method can control the coating thickness of the first composite material on the upper surface of the honeycomb frame, ensure the uniformity and performance consistency of the compressive flexible layer, and make the first composite material have good adhesion to the honeycomb frame, thereby improving the overall structural stability of the compressive flexible layer. Therefore, the method of Example 1 is more preferable.

[0099] By comparing Example 1 with Comparative Example 4, it can be seen that the insulation layer obtained by compounding the three raw materials of cross-linked polyethylene, silicone rubber and short glass fiber in Example 1 has a better effect, especially for the insulation performance and tensile strength of the cable, because the silicone rubber in the composite material provides additional flexibility and temperature resistance, while the short glass fiber enhances the mechanical strength and impact resistance. Cross-linked polyethylene itself has good electrical insulation performance, but it may be insufficient in mechanical performance when used alone, especially when subjected to large tension or impact. Through the synergistic effect of the composite material, not only the overall performance of the insulation layer is improved, but also its stability and durability in complex environments are enhanced.

[0100] 2. Explore the effects of different preparation parameters on the performance of flexible cables;

[0101] Examples 1 to 17 were compared, as shown in Table 2;

[0102] Table 2 Effect of preparation parameters on the performance of flexible cables

[0103]

[0104] As can be seen from Table 2, by comparing Example 1, Example 2 and Example 3, it can be found that the thickness of Example 1 is more preferred; the reason may be that the thickness of each layer in Example 1 is more reasonably distributed, which can optimize the flexibility of the cable while ensuring the overall performance; by comparing Example 1, Example 6 and Example 7, it can be found that the raw material matching of the insulating layer of Example 1 is more preferred; by comparing Example 1, Example 8 and Example 9, it can be found that the preparation parameters of the insulating layer of Example 1 are more preferred; the reason may be that the preparation parameters of the insulating layer ensure the uniform distribution of cross-linked polyethylene, silicone rubber and short glass fiber in the insulating layer, and improve the uniformity of the material. and consistency; by comparing Example 1, Example 10 and Example 11, it can be found that the ratio of coating thickness, aramid honeycomb thickness and connection surface thickness in the compressive flexible layer of Example 1 is more preferred, which may be because the honeycomb structure obtained by the thickness ratio in Example 1 has better force-bearing capacity; by comparing Example 1, Example 12 and Example 13, it can be found that the preparation parameters of the compressive flexible layer in Example 1 are more preferred, by comparing Example 1, Example 14 and Example 15, the heating composite temperature parameters of Example 1 are more preferred, and by comparing Example 1, Example 16 and Example 17, it can be found that the cable preparation parameters of Example 1 are more preferred.

Claims

1. A waterproof and compression-resistant aluminum alloy flexible cable, characterized in that: The flexible cable comprises an insulating layer, a compressive flexible layer and a waterproof layer which are sequentially sleeved on the cable core from the inside to the outside; the cable core is made of aluminum alloy, the compressive flexible layer is made of a honeycomb structure, the honeycomb structure comprises a honeycomb frame and a connecting surface located on the honeycomb frame; the raw materials of the connecting surface comprise carbon fiber and polyurethane in a mass ratio of 1:2 to 4, and the raw material of the honeycomb frame is aramid honeycomb impregnated with epoxy resin; the insulating layer, the compressive flexible layer and the waterproof layer are sequentially bonded by an adhesive.

2. A waterproof and pressure-resistant aluminum alloy flexible cable as claimed in claim 1, characterized in that: The thickness ratio of the insulating layer, the compression-resistant flexible layer and the waterproof layer is 1:2-5:1-2.

3. The waterproof and pressure-resistant aluminum alloy flexible cable according to claim 1, characterized in that: The insulating layer is composited with cross-linked polyethylene, silicone rubber and short glass fiber in a mass ratio of 2:2 to 3:

1.

4. A waterproof and pressure-resistant aluminum alloy flexible cable as claimed in claim 3, characterized in that: The method for preparing the insulating layer comprises: First, cross-linked polyethylene, silicone rubber and short glass fiber are mixed in a high-speed mixer at a speed of 800 to 1200 r / min at 20 to 25° C. for 10 to 15 minutes to obtain a primary mixture; The primary mixture is placed in an ultrasonic generator, deionized water accounting for 10 to 13% of the mass fraction of the primary mixture is added, and then ultrasonic mixing is performed at a frequency of 20 to 40 kHz for 10 to 20 minutes; and then dried until the water evaporates completely to obtain a secondary mixture; Then, the two mixed materials are fed into an extruder and heated and melted at a temperature of 160-200° C., and then extruded and pressed at a screw speed of 10-50 r / min to obtain an insulating layer.

5. The waterproof and pressure-resistant aluminum alloy flexible cable according to claim 1, characterized in that: The aramid honeycomb is a honeycomb-shaped aramid paper; the method for preparing the compressive flexible layer includes: S1-1, immersing the aramid honeycomb in epoxy resin for 2 to 3 hours, first standing and curing at a temperature of 70 to 80° C. for 2 to 3 hours, and then completely curing at a temperature of 150 to 160° C. for 1 to 2 hours to obtain a honeycomb frame; S1-2, cutting the carbon fiber into a length of 0.05 to 0.1 mm, then mixing the carbon fiber with a polyurethane resin in a mass ratio of 1:4, and stirring evenly with a high-speed stirrer to obtain a first composite material; then mixing the carbon fiber with a polyurethane resin in a mass ratio of 1:2, and stirring evenly with a high-speed stirrer to obtain a second composite material; S1-3. Use screen printing to coat the first composite material on the upper surface of the honeycomb frame, then send the second composite material into an extruder, heat and melt it, and then extrude it to obtain a connecting surface, and then compound the connecting surface with the lower surface of the honeycomb frame to obtain a compressive flexible layer; the ratio of the coating thickness of the first composite material, the thickness of the aramid honeycomb, and the thickness of the connecting surface is 1:1.3~1.5; 0.8~1.

6. The waterproof and pressure-resistant aluminum alloy flexible cable according to claim 5, characterized in that: In the S1-3, the method for compounding the connecting surface with the lower surface of the honeycomb frame adopts one of heating or adhesive bonding.

7. The waterproof and pressure-resistant aluminum alloy flexible cable according to claim 6, characterized in that: The temperature of the heating compounding is 90-140°C.

8. The waterproof and pressure-resistant aluminum alloy flexible cable according to claim 5, characterized in that: The waterproof layer is made of silicone rubber.

9. The method for preparing a waterproof and pressure-resistant aluminum alloy flexible cable according to claim 5, characterized in that: The following steps are involved: S1. First, wrapping the insulating layer on the cable core at a temperature of 160-200° C. by hot extrusion; S2, then at a temperature of 60 to 80° C., cutting the compressive flexible layer into a strip, applying an adhesive on the side of the honeycomb frame of the compressive flexible layer coated with the first composite material and bonding it to the insulating layer, and winding the compressive flexible layer outside the insulating layer; S3. Then, by hot extrusion at a temperature of 150-170° C., the waterproof layer is wrapped around the compression-resistant flexible layer to obtain the flexible cable.

10. The waterproof and pressure-resistant aluminum alloy flexible cable according to claim 5, characterized in that: The adhesive is a silicone rubber-based adhesive.

Images