A watertight and stable coaxial cable

Abstract

The invention discloses a watertight and stable coaxial cable, comprising a cable body, wherein the cable body comprises an inner conductor, an insulating layer, an outer conductor and an outer sheath; the insulating layer, the outer conductor and the outer sheath are arranged in a circular pattern in sequence with the inner conductor as the center of the circle; an anti-penetration layer is coated between the layers of the inner conductor, the insulating layer, the outer conductor and the outer sheath; the anti-penetration layer comprises an anti-penetration material; in the invention, an anti-penetration and anti-corrosion composite material is arranged between the layers of the inner conductor, the insulating layer, the outer conductor and the outer sheath, so that when the coaxial cable is cut off, water will not penetrate from the length of the cable along the cross section, and the cross section also has the advantage of good anti-corrosion performance, so that when the cable is broken horizontally, it will not be affected, and the cable can be connected and continuously used.

Description

Technical Field

[0001] The invention relates to the technical field of cable production, and in particular to a watertight and stable coaxial cable. Background Art

[0002] Chinese patent CN202711853U discloses a cable, in particular, an ultra-light coaxial cable, which includes an inner conductor, an insulating layer, a shielding layer and a sheath layer. The inner conductor is made of a single silver-plated copper-clad aluminum wire, and the shielding layer is twisted with a silver-plated copper-clad aluminum wire bundle. The silver-plated copper-clad aluminum wire includes an aluminum wire located in the center, a copper-plated layer is arranged outside the aluminum wire, and a silver-plated layer is arranged outside the copper-plated layer.

[0003] In the prior art, when a coaxial cable is cut, water will penetrate along the cross section from the length of the cable, and will also be corroded by seawater, causing the cable to break horizontally, directly leading to cable damage and inability to be used normally; and when the cable is coated with an anti-penetration coating, it has a problem of poor applicability and cannot meet the problem of cable production with different process requirements. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems of the background technology and to provide a watertight and stable coaxial cable.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A watertight and stable coaxial cable comprises a cable body, wherein the cable body comprises an inner conductor, an insulating layer, an outer conductor and an outer sheath; the insulating layer, the outer conductor and the outer sheath are arranged in a circular pattern in sequence with the inner conductor as the center; an anti-permeation layer is coated between the layers of the inner conductor, the insulating layer, the outer conductor and the outer sheath; the anti-permeation layer comprises an anti-permeation material;

[0007] The preparation process of the anti-permeability material comprises the following steps:

[0008] Step 1: Add ethyl orthosilicate and hexadecyltrimethoxysilane to ethanol; then gradually add 6 mL of 28% ammonia solution, stir at room temperature for 4-6 hours, remove the solvent by rotary evaporation under reduced pressure, and vacuum dry to obtain fine particles of hydrophobic silane nanoparticles, and grind them in a mortar to obtain powdered hydrophobic silane nanoparticles;

[0009] Step 2: Mix the hydrophobic silane nanoparticles with ethanol and stir for 10 minutes;

[0010] Step 3: Add 3 g of polylactic acid particles dried at 60° C. in vacuum for 24 h to 100 g of dichloromethane, and stir the solvent at room temperature to obtain a polylactic acid-dichloromethane solution; wherein;

[0011] Step 4: The hydrophobic silane nanoparticles are mixed with the polylactic acid-dichloromethane solution, and ultrasonically dispersed for 10 minutes, and KH550 accounting for 0.4% of the total mass of the polylactic acid-dichloromethane solution is added, and stirred for 1 hour to obtain the anti-permeability material.

[0012] As a further solution of the present invention: the molar ratio of ethyl orthosilicate to hexadecyltrimethoxysilane is 1-6:1-2.

[0013] As a further solution of the present invention: the mass ratio of hydrophobic silane nanoparticles to ethanol is 3-5:9-11.

[0014] As a further solution of the present invention: the mass ratio of polylactic acid particles to dichloromethane is 3-5:80-100.

[0015] As a further solution of the present invention: the mass ratio of hydrophobic silane nanoparticles to polylactic acid-dichloromethane solution is 2-8:80-100.

[0016] As a further solution of the present invention: the anti-permeability layer also includes an anti-corrosion material; the anti-permeability material and the anti-corrosion material are added to an acetone solvent in a mass ratio of 20-30:2-4 and mixed for 30 minutes, and the solvent is removed by vacuum rotary evaporation, and vacuum drying is performed to obtain the anti-permeability layer.

[0017] As a further solution of the present invention: the preparation process of the anti-corrosion material comprises the following steps:

[0018] Step 1: adding chloroform and anhydrous ethanol to a reaction container and mixing, then dropping a mixed solution of chloroform and phosphorus trichloride, controlling the reaction temperature to 5-10°C, and the dropping time to 40-60min; after the reaction is complete, adjusting the pH to neutral with a 10% sodium carbonate solution, then adding deionized water for washing three times, separating and removing water and phosphorus trichloride with a separatory funnel; and then distilling under reduced pressure to obtain intermediate 1;

[0019] Step 2: Add intermediate 1, solvent n-hexane, and catalyst di(β-diimino) divalent rare earth metal into a reaction container and mix, then drop diaminoacetone into the reaction container, stir for 10 min at 30° C., add deionized water to terminate the reaction, add ethyl acetate to dissolve the product, rotary evaporate, wash with n-hexane, and dry to obtain intermediate 2;

[0020] Step 3: Add urea and intermediate 2 into a reaction vessel, connect a reflux condenser, heat to 140°C for reaction, and mechanically stir for 3 hours to obtain an anti-corrosion coating.

[0021] As a further solution of the present invention: the dosage ratio of chloroform, anhydrous ethanol and phosphorus trichloride is controlled to be 60-80 mL: 0.8-1.2 mol: 0.2 mol.

[0022] As a further solution of the present invention: the dosage ratio of diaminoacetone, intermediate 1, n-hexane and di(β-diimino) divalent rare earth metal is controlled to be 1 mol: 1.0-1.5 mol: 5-10 mL: 0.08-0.12 mol.

[0023] As a further solution of the present invention: the usage ratio of urea and intermediate 2 is controlled to be 2-2.5 mol:1 mol.

[0024] Beneficial effects of the present invention:

[0025] (1) The anti-permeability material of the present invention is a thermoplastic polymer with a smooth surface and no microcracks, micropores or crystal defects, which makes it difficult for water to be adsorbed on the surface of the anti-permeability material; the crystal structure segments of the anti-permeability material are arranged neatly and have a high packing density, making it difficult for water to penetrate through; in addition, the molecular structure of polylactic acid is linear and tightly connected, so that the free volume in the polymer molecules is relatively small and the permeability of water molecules is relatively weak, that is, it has a strong barrier to water; and the anti-permeability material also has good waterproof performance;

[0026] (2) The present invention firstly obtains intermediate 1 by reacting anhydrous ethanol and phosphorus trichloride, wherein intermediate 1 is diethyl phosphite; then, intermediate 1 undergoes a hydrogen phosphation reaction with diaminoacetone to obtain intermediate 2, and intermediate 2 undergoes a polycondensation reaction with urea to obtain an anti-corrosion coating; the structure of the anti-corrosion coating is a diethyl phosphite structure grafted into polyurea, wherein the polyurea has the advantages of rapid curing, excellent physical and chemical properties, and green and environmentally friendly anti-corrosion performance; so that the obtained anti-permeability material has the advantages of good anti-corrosion performance;

[0027] (3) Coating the anti-permeability material on the surface of the inner conductor, the insulating layer, the outer conductor and the outer sheath; thereby completing the coating of the cable; therefore, in the coating work of the present invention, the upper conveying roller 7 and the lower conveying roller 8 can be adjusted horizontally to ensure that the cable can be normally limited and conveyed, and the time for coating with the anti-permeability material can be adjusted; the lower conveying roller 8 can also be adjusted vertically to further adjust the time for coating the cable with the anti-permeability material; at the same time, the adjusting member can fine-tune the tension of the cable conveying time, so that the cable can be normally conveyed; the coating mechanism has high applicability, and it is convenient to adjust the time for coating the cable according to different process requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1 It is a structural schematic diagram of a watertight phase-stable cable gluing device of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the connection relationship between the mounting plate and the telescopic frame of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the adjusting member of the present invention.

[0032] In the figure: 1. Glue coating box; 2. Glue coating mechanism; 3. Mounting plate; 4. Mounting frame; 5. Telescopic frame; 6. Fastening bolts; 7. Upper conveying roller; 8. Lower conveying roller; 9. Limiting plate; 10. Limiting groove; 11. Connecting rod; 12. Gear box; 13. Gear; 14. Rack; 15. Upper connecting ear; 16. Lower connecting ear; 17. Heating plate. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] The present invention discloses a watertight and stable coaxial cable, comprising a cable body, wherein the cable body comprises an inner conductor, an insulating layer, an outer conductor and an outer sheath; the insulating layer, the outer conductor and the outer sheath are arranged in a circular pattern in sequence with the inner conductor as the center; an anti-permeation layer is coated between the layers of the inner conductor, the insulating layer, the outer conductor and the outer sheath; the anti-permeation layer comprises an anti-permeation material;

[0036] The preparation process of the anti-permeability material comprises the following steps:

[0037] Step 1: adding ethyl orthosilicate and hexadecyltrimethoxysilane to 25 mL of ethanol in a molar ratio of 1:1; then gradually adding 6 mL of 28% ammonia solution dropwise, stirring at room temperature for 4-6 hours, vacuum evaporating to remove the solvent, and vacuum drying to obtain fine particles of hydrophobic silane nanoparticles, and grinding in a mortar to obtain powdered hydrophobic silane nanoparticles;

[0038] Step 2: Mix the hydrophobic silane nanoparticles and ethanol in a mass ratio of 3:9 and stir for 10 minutes;

[0039] Step 3: adding 3 g of polylactic acid particles dried under vacuum at 60° C. for 24 h to 100 g of dichloromethane, stirring the solvent at room temperature to obtain a polylactic acid-dichloromethane solution; wherein the mass ratio of polylactic acid particles to dichloromethane is 3:80;

[0040] Step 4: The hydrophobic silane nanoparticles and the polylactic acid-dichloromethane solution were mixed in a mass ratio of 5:90, and ultrasonically dispersed for 10 minutes, and KH550 accounting for 0.4% of the total mass of the polylactic acid-dichloromethane solution was added, and stirred for 1 hour to obtain an anti-permeability material;

[0041] The anti-permeability material of the present invention is a thermoplastic high molecular polymer with a smooth surface and no microcracks, micropores or crystal defects, which makes it difficult for water to be adsorbed on the surface of the anti-permeability material; the crystal structure segments of the anti-permeability material are arranged neatly and have a high stacking density, making it difficult for water to penetrate through; in addition, the molecular structure of polylactic acid is linear and tightly connected, so that the free volume in the polymer molecules is relatively small and the permeability of water molecules is relatively weak, that is, it has a strong barrier to water; and the anti-permeability material also has good waterproof performance.

[0042] Example 2

[0043] The preparation process of the anti-permeability material comprises the following steps:

[0044] Step 1: Add ethyl orthosilicate and hexadecyltrimethoxysilane to 25 mL of ethanol at a molar ratio of 3:1; then gradually add 6 mL of 28% ammonia solution dropwise, stir at room temperature for 5 hours, remove the solvent by rotary evaporation under reduced pressure, and vacuum dry to obtain fine particles of hydrophobic silane nanoparticles, and grind them in a mortar to obtain powdered hydrophobic silane nanoparticles;

[0045] Step 2: Mix the hydrophobic silane nanoparticles and ethanol in a mass ratio of 4:10 and stir for 10 minutes;

[0046] Step 3: Add 3 g of polylactic acid particles dried under vacuum at 60° C. for 24 h into 100 g of dichloromethane, and stir the solvent at room temperature to obtain a polylactic acid-dichloromethane solution; wherein the mass ratio of polylactic acid particles to dichloromethane is 4:90;

[0047] Step 4: Mix the hydrophobic silane nanoparticles and the polylactic acid-dichloromethane solution in a mass ratio of 5:90, and disperse them by ultrasonication for 10 minutes, add 0.4% of KH550 to the total mass of the polylactic acid-dichloromethane solution, and stir for 1 hour to obtain an anti-permeability material.

[0048] Example 3

[0049] The preparation process of the anti-permeability material comprises the following steps:

[0050] Step 1: adding ethyl orthosilicate and hexadecyltrimethoxysilane to 25 mL of ethanol in a molar ratio of 1-6:1-2; then gradually adding 6 mL of 28% ammonia solution dropwise, stirring at room temperature for 4-6 hours, removing the solvent by rotary evaporation under reduced pressure, and vacuum drying to obtain fine particles of hydrophobic silane nanoparticles, and grinding by mortar to obtain powdered hydrophobic silane nanoparticles;

[0051] Step 2: Mix the hydrophobic silane nanoparticles and ethanol in a mass ratio of 5:11 and stir for 10 minutes;

[0052] Step 3: adding 3 g of polylactic acid particles dried under vacuum at 60° C. for 24 h to 100 g of dichloromethane, stirring the solvent at room temperature to obtain a polylactic acid-dichloromethane solution; wherein the mass ratio of polylactic acid particles to dichloromethane is 5:100;

[0053] Step 4: The hydrophobic silane nanoparticles and the polylactic acid-dichloromethane solution were mixed at a mass ratio of 8:100, and ultrasonically dispersed for 10 minutes, and KH550 accounting for 0.4% of the total mass of the polylactic acid-dichloromethane solution was added, and stirred for 1 hour to obtain the anti-permeability material.

[0054] Example 4

[0055] Based on the above embodiments 1-3, when the coaxial cable is used in acidic water, the service life of the anti-permeation material will be affected; therefore, an anti-corrosion material is also added to the anti-permeation material; the anti-permeation material and the anti-corrosion material are added to an acetone solvent at a mass ratio of 20-30:2-4 and mixed for 30 minutes, and the solvent is removed by vacuum rotary evaporation, and vacuum drying is performed to obtain an anti-permeation and anti-corrosion composite material;

[0056] The preparation process of the anti-corrosion material comprises the following steps:

[0057] Step 1: adding chloroform and anhydrous ethanol to a reaction container and mixing, then dropping a mixed solution of chloroform and phosphorus trichloride, controlling the reaction temperature to 5-10°C, and the dropping time to 40-60min; after the reaction is complete, adjusting the pH to neutral with a 10% sodium carbonate solution, then adding deionized water for washing three times, separating and removing water and phosphorus trichloride with a separatory funnel; and then distilling under reduced pressure to obtain intermediate 1;

[0058] Step 2: Add intermediate 1, solvent n-hexane, and catalyst di(β-diimino) divalent rare earth metal into a reaction container and mix, then drop diaminoacetone into the reaction container, stir for 10 min at 30° C., add deionized water to terminate the reaction, add ethyl acetate to dissolve the product, rotary evaporate, wash with n-hexane, and dry to obtain intermediate 2;

[0059] The reaction process is as follows:

[0060]

[0061] Step 3: Add urea and intermediate 2 into a reaction vessel, connect a reflux condenser, heat to 140°C for reaction, and mechanically stir for 3 hours to obtain an anti-corrosion coating;

[0062] The reaction process is as follows:

[0063]

[0064] The dosage ratio of chloroform, anhydrous ethanol and phosphorus trichloride was controlled to be 60mL:0.8mol:0.2mol.

[0065] The dosage ratio of diaminoacetone, intermediate 1, n-hexane and di(β-diimino) divalent rare earth metal is controlled to be 1 mol: 1.0 mol: 5 mL: 0.08 mol.

[0066] The dosage ratio of urea and intermediate 2 is controlled to be 2 mol:1 mol.

[0067] Example 5

[0068] The difference from Example 4 is that the usage ratio of chloroform, anhydrous ethanol and phosphorus trichloride is controlled to be 70 mL: 1.0 mol: 0.2 mol.

[0069] The dosage ratio of diaminoacetone, intermediate 1, n-hexane and di(β-diimino) divalent rare earth metal is controlled to be 1 mol:1.2 mol:8 mL:0.10 mol.

[0070] The dosage ratio of urea and intermediate 2 is controlled to be 2.3 mol:1 mol.

[0071] Example 6

[0072] The difference from Example 4 is that the usage ratio of chloroform, anhydrous ethanol and phosphorus trichloride is controlled to be 80 mL: 1.2 mol: 0.2 mol.

[0073] The dosage ratio of diaminoacetone, intermediate 1, n-hexane and di(β-diimino) divalent rare earth metal is controlled to be 1 mol:1.5 mol:10 mL:0.12 mol.

[0074] The dosage ratio of urea and intermediate 2 is controlled to be 2.5 mol:1 mol.

[0075] The invention firstly obtains an intermediate 1 by reacting anhydrous ethanol and phosphorus trichloride, wherein the intermediate 1 is diethyl phosphite; then, the intermediate 1 undergoes a hydrogen phosphation reaction with diaminoacetone to obtain an intermediate 2, and the intermediate 2 undergoes a polycondensation reaction with urea to obtain an anti-corrosion coating; the structure of the anti-corrosion coating is that a diethyl phosphite structure is grafted into polyurea, wherein the polyurea has the advantages of rapid curing, excellent physical and chemical properties, and green and environmentally friendly anti-corrosion performance; so that the obtained anti-permeability material has the advantages of good anti-corrosion performance.

[0076] The invention firstly obtains an intermediate 1 by reacting anhydrous ethanol and phosphorus trichloride, wherein the intermediate 1 is diethyl phosphite; then, the intermediate 1 undergoes a hydrogen phosphation reaction with diaminoacetone to obtain an intermediate 2, and the intermediate 2 undergoes a polycondensation reaction with urea to obtain an anti-corrosion coating; the structure of the anti-corrosion coating is that a diethyl phosphite structure is grafted into polyurea, wherein the polyurea has the advantages of rapid curing, excellent physical and chemical properties, and green and environmentally friendly anti-corrosion performance; so that the obtained anti-permeability material has the advantages of good anti-corrosion performance.

[0077] Comparative Example 1

[0078] The comparative example is the coaxial cable provided by Chinese patent CN2632818;

[0079] Performance tests were conducted on Examples 1-3 and Comparative Example 1, wherein the anti-corrosion test was conducted using a seawater acidification cycle test; the test results are shown in the following table;

[0080]

[0081] In summary, anti-penetration and anti-corrosion composite materials are arranged between the layers of the inner conductor, the insulating layer, the outer conductor and the outer sheath, so that when the coaxial cable is cut, water will not penetrate along the cross section from the length of the cable, and the cross section also has the advantage of good anti-corrosion performance, so that when the cable is broken horizontally, it will not be affected, and the cable can still be connected and continue to be used.

[0082] Example 7

[0083] Based on the above-mentioned embodiment 1, an anti-permeation layer is coated between the layers of the inner conductor, the insulating layer, the outer conductor and the outer sheath. During operation, the inner conductor, the insulating layer, the outer conductor and the outer sheath sequentially pass through a coating box 1 filled with an anti-permeation material, and the coating mechanism 2 in the coating box 1 performs a uniform coating operation, so that the anti-permeation material can be uniformly coated on the corresponding inner conductor, the insulating layer and the outer conductor.

[0084] Among them, the gluing mechanism 2 includes a mounting plate 3, a mounting frame 4, a telescopic frame 5, a fastening bolt 6, an upper conveying roller 7, a lower conveying roller 8, a limiting plate 9, a limiting groove 10, an upper connecting ear 15, a lower connecting ear 16, and an electric heating plate 17; a mounting frame 4 is arranged on the back of the mounting plate 3, and is mounted on the inner wall of the gluing box 1 through the mounting frame 4, a telescopic frame 5 is sleeved on the bottom of the mounting frame 4, and the telescopic frame 5 moves up and down along the mounting frame 4, upper connecting ears 15 are respectively arranged on both sides of the mounting frame 4, lower connecting ears 16 are respectively arranged on both sides of the telescopic frame 5, and the upper connecting ears 15 and the lower connecting ears 16 are respectively horizontally connected to the limiting plate 9, a rectangular limiting groove 10 is arranged in the limiting plate 9, an upper conveying roller 7 is arranged in the limiting groove 10 of the upper limiting plate 9, and a lower conveying roller 8 is arranged in the limiting groove 10 of the lower limiting plate 9, and the upper conveying roller 7 and the lower conveying roller 8 are connected to each other through an adjusting member;

[0085] The adjusting member includes a connecting rod 11, a gear box 12, a gear 13, and a rack 14. Two connecting rods 11 are arranged side by side. The two ends of the connecting rod 11 are respectively connected to the upper conveying roller 7 and the lower conveying roller 8. A gear box 12 is arranged on the side wall of the mounting plate 3. A gear 13 is rotatably arranged in the gear box 12. The gear 13 is connected to the rotating shaft. One side of the rotating shaft passes through the gear box 12 and the glue coating box 1, and is rotatably connected to the gear box 12 and the glue coating box 1 through a sealed bearing. Racks 14 are respectively arranged on the upper and lower sides of the gear 13. The two racks 14 are respectively meshed and connected with the gear 13. The rack 14 passes through the gear box 12 and is connected to the connecting rod 11.

[0086] When the adjusting member is working, the rotation of the rotating shaft is controlled to drive the gear 13 to rotate forward and reversely, and the gear 13 and the rack 14 are meshed to make the rack 14 move horizontally toward each other along the gear box 12, so as to adjust the distance between the two connecting rods 11, and then the distance between the two upper conveying rollers 7 and the lower conveying roller 8; so that the adjusting member can adjust the coating time of the cable according to different process requirements, that is, change the distance that the cable is conveyed in the anti-permeation material;

[0087] The mounting frame 4 is connected to the telescopic frame 5 by fastening bolts 6. By adjusting the fastening bolts 6, the position of the telescopic frame 5 is changed, thereby changing the depth of the cable immersed in the anti-penetration material;

[0088] An electric heating plate 17 is installed at the bottom of the telescopic frame 5 by bolts, a connecting plate is arranged above the electric heating plate 17 for connecting with the telescopic frame 5, a horizontal plate is arranged below the electric heating plate 17, a heating coil is arranged inside the horizontal plate, and the electric heating plate 17 is located between the two lower conveying rollers 8, so that the electric heating plate 17 is close to the cable, so that the temperature of the cable can be more accurately controlled;

[0089] When working, firstly, according to the requirements of the cable production process, the rotation of the shaft is controlled to drive the gear 13 to rotate forward and reversely, and the gear 13 and the rack 14 are meshed to make the rack 14 move horizontally toward each other along the gear box 12, so as to adjust the distance between the two connecting rods 11, and then adjust the distance between the two upper conveying rollers 7 and the lower conveying roller 8; then adjust the telescopic frame 5 up and down along the mounting plate 3 and move it to the specified position; so as to adjust and fix the positions of the upper conveying roller 7 and the lower conveying roller 8;

[0090] Then, the inner conductor is passed through the upper conveying roller 7 and the lower conveying roller 8 on one side in sequence, and then passed through the upper conveying roller 7 and the lower conveying roller 8 on the other side, and is conveyed along the upper conveying roller 7 and the lower conveying roller 8, so that the anti-permeation material is coated on the inner conductor;

[0091] Similarly, according to the above-mentioned operating steps, the anti-permeability material is coated on the surface of the insulating layer, the outer conductor and the outer sheath; thereby completing the coating of the cable; therefore, in the coating work of the present invention, the upper conveying roller 7 and the lower conveying roller 8 can be horizontally adjusted to ensure that the cable can be normally limited and conveyed, and the time for coating with the anti-permeability material can be adjusted; the lower conveying roller 8 is also adjusted in the vertical direction to further adjust the time for coating the cable with the anti-permeability material; at the same time, the adjusting member can fine-tune the tension of the cable transmission time, so that the cable can be normally transmitted; the coating mechanism has high applicability, and it is convenient to adjust the time for coating the cable according to different process requirements.

[0092] Working principle of the present invention: The coating mechanism of the present invention first controls the rotation of the rotating shaft according to the requirements of the cable production process, drives the gear 13 to rotate forward and reversely, and through the meshing action between the gear 13 and the rack 14, the rack 14 moves horizontally toward each other along the gear box 12, thereby adjusting the distance between the two connecting rods 11, and then adjusting the distance between the two upper conveying rollers 7 and the lower conveying roller 8; then adjust the telescopic frame 5 up and down along the mounting plate 3 and move it to the specified position; so that the position of the upper conveying roller 7 and the lower conveying roller 8 is adjusted and fixed;

[0093] The mounting frame 4 is connected to the telescopic frame 5 by means of a fastening bolt 6. By adjusting the fastening bolt 6, the position of the telescopic frame 5 is changed, thereby changing the corresponding depth of the cable immersed in the anti-penetration material.

[0094] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A watertight and stable coaxial cable, characterized in that: The cable body includes an inner conductor, an insulating layer, an outer conductor and an outer sheath; the insulating layer, the outer conductor and the outer sheath are arranged in a circular pattern with the inner conductor as the center; an anti-permeation layer is coated between the layers of the inner conductor, the insulating layer, the outer conductor and the outer sheath; the anti-permeation layer includes an anti-permeation material; The preparation process of the anti-permeability material comprises the following steps: Step 1: Add ethyl orthosilicate and hexadecyltrimethoxysilane to ethanol; then gradually add 6 mL of 28% ammonia solution, stir at room temperature for 4-6 hours, remove the solvent by rotary evaporation under reduced pressure, and vacuum dry to obtain fine particles of hydrophobic silane nanoparticles, and grind them in a mortar to obtain powdered hydrophobic silane nanoparticles; Step 2: Mix the hydrophobic silane nanoparticles with ethanol and stir for 10 minutes; Step 3: Add 3 g of polylactic acid particles dried at 60° C. in vacuum for 24 h to 100 g of dichloromethane, and stir the solvent at room temperature to obtain a polylactic acid-dichloromethane solution; Step 4: The hydrophobic silane nanoparticles are mixed with the polylactic acid-dichloromethane solution, and ultrasonically dispersed for 10 minutes, and KH550 accounting for 0.4% of the total mass of the polylactic acid-dichloromethane solution is added, and stirred for 1 hour to obtain an anti-permeability material; The anti-permeability layer also includes an anti-corrosion material; the anti-permeability material and the anti-corrosion material are added to an acetone solvent in a mass ratio of 20-30:2-4 and mixed for 30 minutes, and the solvent is removed by vacuum rotary evaporation, and vacuum drying is performed to obtain an anti-permeability layer; The preparation process of the anti-corrosion material comprises the following steps: Step 1: Add chloroform and anhydrous ethanol to a reaction container and mix, then drop a mixed solution of chloroform and phosphorus trichloride, control the reaction temperature to 5-10°C, and the dropping time to 40-60min; after the reaction is complete, adjust the pH to neutral with a 10% sodium carbonate solution, then add deionized water for washing three times, separate and remove water and phosphorus trichloride with a separatory funnel; and then perform reduced pressure distillation to obtain intermediate 1; Step 2: Add intermediate 1, solvent n-hexane, and catalyst di(β-diimino) divalent rare earth metal into a reaction container and mix, then drop diaminoacetone into the reaction container, stir for 10 min at a temperature of 30° C., add deionized water to terminate the reaction, then add ethyl acetate to dissolve the product, rotary evaporate, wash with n-hexane, and dry to obtain intermediate 2; Step 3: Add urea and intermediate 2 into a reaction vessel, connect a reflux condenser, heat to 140°C for reaction, and mechanically stir for 3 hours to obtain an anti-corrosion material.

2. A watertight stable coaxial cable according to claim 1, characterized in that: The molar ratio of ethyl orthosilicate to hexadecyltrimethoxysilane is 1-6:1-2.

3. A watertight and stable coaxial cable according to claim 1, characterized in that: The mass ratio of hydrophobic silane nanoparticles to ethanol is 3-5:9-11.

4. A watertight stable coaxial cable according to claim 1, characterized in that: The mass ratio of polylactic acid particles to dichloromethane is 3-5:80-100.

5. A watertight and stable coaxial cable according to claim 1, characterized in that: The mass ratio of the hydrophobic silane nanoparticles to the polylactic acid-dichloromethane solution is 2-8:80-100.

6. A watertight and stable coaxial cable according to claim 1, characterized in that: Control the dosage ratio of chloroform, anhydrous ethanol and phosphorus trichloride to 60-80mL: 0.8-1.2mol:0.2mol.

7. A watertight stable coaxial cable according to claim 6, characterized in that: The dosage ratio of diaminoacetone, intermediate 1, n-hexane and di(β-diimino) divalent rare earth metal is controlled to be 1 mol: 1.0-1.5 mol: 5-10 mL: 0.08-0.12 mol.

8. A watertight stable coaxial cable according to claim 7, characterized in that: The dosage ratio of urea and intermediate 2 is controlled to be 2-2.5 mol:1 mol.

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