A high-frequency anti-interference cable for testing and a processing technology thereof

Abstract

The application relates to the technical field of cables, in particular to a high-frequency anti-interference cable for testing and a processing technology thereof. The processing technology comprises the following steps: S1, preparing an insulating layer raw material; S2, preparing an outer protective layer raw material; S3, adding the insulating layer raw material and a shaped conductor core into an extruding machine, and once extruding and shaping on the surface to obtain an insulating layer, which is a cable A; adding the outer protective layer raw material and the cable A into the extruding machine, and twice extruding and shaping on the surface to obtain an outer protective layer; degassing to obtain a high-frequency anti-interference cable. The prepared modified carbon nanotube is grafted with an organic molecular chain through chemical bonding, the interface compatibility of the carbon nanotube with polyethylene and polytetrafluoroethylene can be greatly improved, the carbon-based groups, benzene rings and carbon-carbon double bonds of the carbon nanotube can effectively absorb electromagnetic waves, and the performance of the prepared cable is improved in the high-frequency anti-interference aspect.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a high-frequency anti-interference cable for testing and its processing technology. Background Technology

[0002] Wired communication systems are widely used in society. In automated control systems, fieldbuses and other communication lines are often subject to various electromagnetic interferences. Using anti-interference cables can improve system stability and signal accuracy. Medical equipment, such as high-precision medical imaging equipment like MRI and CT scanners, needs to operate stably in strong electromagnetic environments. The use of anti-interference cables can ensure the normal operation of the equipment and the accuracy of data. Electronic equipment in the military and aerospace fields often faces complex electromagnetic environments. In these cases, anti-interference cables are used to protect critical communication and control systems from external interference.

[0003] The development of anti-interference cables is rapid, which puts forward higher requirements for the anti-interference ability of cables. The insulation layer of traditional anti-interference cables is generally made of polyethylene material, which has limited anti-interference ability. Therefore, in order to solve the above problems, a high-frequency anti-interference cable for testing has been prepared. Summary of the Invention

[0004] The purpose of this invention is to provide a high-frequency anti-interference cable for testing and its processing technology, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A manufacturing process for a high-frequency anti-interference cable for testing includes the following steps:

[0007] S1: Mix polyethylene, PE-g-GMA, modified carbon nanotubes and antioxidants evenly to obtain the insulation layer raw material;

[0008] S2: Mix polytetrafluoroethylene resin, polyoxymethylene resin, modified carbon nanotubes, cyclohexanone peroxide, flusulfanilamide and barium sulfate evenly to obtain the raw material for the outer protective layer;

[0009] S3: Add the insulation layer material and the shaped conductor core to the extruder and extrude them on the surface once to obtain the insulation layer, which is cable A; add the outer protective layer material and cable A to the extruder and extrude them on the surface a second time to obtain the outer protective layer; degas to obtain a high-frequency anti-interference cable.

[0010] More optimally, the insulating layer raw material includes the following substances: by weight, 80-83 parts polyethylene, 5-6 parts PE-g-GMA, 8-13 parts modified carbon nanotubes, and 5-6 parts antioxidant.

[0011] More optimally, the outer protective layer material includes the following substances: by weight, 50-60 parts polytetrafluoroethylene resin, 25-30 parts polyoxymethylene resin, 5-8 parts modified carbon nanotubes, 2-3 parts initiator, 0.5-1.2 parts flusulfanilamide and 0.8-1.3 parts barium sulfate.

[0012] More preferably, the polyethylene includes low-density polyethylene and high-density polyethylene in a mass ratio of (0.5-1):(3-3.5).

[0013] The optimized process parameters are as follows: temperature 150-180℃, pressure 60-105MPa; secondary extrusion process parameters are as follows: temperature 120-125℃, pressure 55-95MPa; and degassing process parameters are as follows: temperature 80-100min, time 18-20h.

[0014] More optimized: The preparation method of the shaped conductor core is as follows: (1) drawing and annealing of the wire core monofilament: drawing the copper-aluminum rod to a monofilament with a diameter of 2-3 mm, and performing homogenization annealing, and naturally cooling to room temperature to obtain copper-aluminum monofilament; (2) winding the wire core: winding 3-4 copper-aluminum monofilaments at 30-50℃ without retraction, and injecting glue at the connection of the monofilament winding to obtain the shaped conductor core. The copper-aluminum rod has a copper to aluminum ratio of 1:(8-9). It needs to be heated to 40-50℃ before drawing, the annealing temperature is 300-350℃, and the annealing time is 30-50 min.

[0015] In a more optimized manner: This patent effectively improves the anti-interference capability of the cable by introducing modified carbon nanotubes and improves the processing technology. The synthesis of the modified carbon nanotubes is as follows:

[0016] (A) Multi-walled carbon nanotubes were added to a mixed acid system, sonicated for 1-2 hours, centrifuged, and the supernatant was removed. The precipitate was thoroughly washed with distilled water, dried at 60-70℃ for 12-15 hours, and ground to obtain carboxylated carbon nanotubes. The chemical reaction process is as follows: Figure 1 As shown;

[0017] (B) Place 2-methylene-1,3-propanediol and p-methylbenzoyl chloride into a three-necked flask equipped with a stirring and reflux apparatus. While stirring, slowly add pyridine to the solution to catalyze the reaction. Reflux at 75-80°C for 3-4 hours. After the reaction is complete, first distill under reduced pressure, then purify by column chromatography, and finally rotary evaporate to obtain the intermediate. The chemical reaction process is as follows: Figure 2 As shown;

[0018] (C) Add 6-aminonicotinic acid and the intermediate to cyclohexane, place the mixture in a three-necked flask, and add concentrated sulfuric acid solution while stirring. React at 80-90℃ for 6-7 hours. After the reaction is complete, remove most of the solution by rotary evaporation, then purify by column chromatography and rotary evaporation to obtain the modifier. The chemical reaction process is as follows: Figure 3 As shown;

[0019] (D) Carboxylated carbon nanotubes and a modifier were added to cyclohexane and placed in a three-necked flask equipped with a stirrer. The mixture was ultrasonically heated in a water bath for 60-70 minutes. Then, dicyclohexylcarbodiimide and 4-dimethylaminopyridine were added sequentially. After mixing, the mixture was stirred in a water bath at 80-85°C for 2-3 hours. During the reaction, 100-150 ml of anhydrous ethanol was added to dilute the catalyst molecules. After the reaction was complete, the mixture was washed 3-4 times and dried in a hollow oven at 60-70°C for 4-5 hours. The dried mixture was then crushed to obtain the modified carbon nanotubes. The chemical reaction process is as follows: Figure 4 As shown.

[0020] In a more optimized manner: the ratio of multi-walled carbon nanotubes to mixed acid is 1g:10mL, wherein the mixed acid is composed of sulfuric acid and nitric acid in a volume ratio of 3:1; in the intermediate, the mass ratio of 2-methylene-1,3-propanediol to p-methylbenzoyl chloride is 1:1.75; the mass ratio of the intermediate to 6-aminonicotinic acid is 1:(0.6-0.7); the amount of concentrated sulfuric acid added accounts for 0.5-0.6wt% of the intermediate; the raw material of the modified carbon nanotubes includes the following components, by weight: 10-15 parts carboxylated carbon nanotubes, 10-20 parts modifier, 2-5.5 parts dicyclohexylcarbodiimide, and 3.5-5 parts 4-dimethylaminopyridine.

[0021] The modified carbon nanotubes obtained are grafted with organic molecular chains through chemical bonding, forming an organic layer on their surface. This significantly improves the interfacial compatibility between carbon nanotubes and polyethylene and polytetrafluoroethylene, thereby promoting the uniform dispersion of carbon nanotubes in the insulation layer and outer protective layer. Furthermore, as carbon nanotubes are inorganic fillers, the organic molecular chains, grafted onto their surface, are difficult to leach and migrate, ensuring the durability of various properties. The compatibilizer PE-g-GMA in the insulation layer raw material has epoxy groups, which can react and crosslink with the modified carbon nanotubes, further improving the reaction compatibility. The experiment used a mixture of low-density polyethylene and high-density polyethylene. Blending polyethylene of different densities widens the melting zone and delays crystallization when the molten material cools, resulting in blended polyethylene exhibiting better mechanical properties compared to single-density polyethylene.

[0022] Furthermore, the modified carbon nanotubes incorporate a large number of carbon-based groups, which can absorb electromagnetic waves through dipole vibrations; the introduced benzene rings and carbon-carbon double bonds can absorb electromagnetic waves through π-π and n-π electronic transitions; and the carbon nanotubes themselves can absorb electromagnetic waves through electron conduction in the carbon network and surface plasmon resonance. Therefore, the resulting cables exhibit improved high-frequency interference resistance. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a diagram of the synthesis reaction of carboxylated carbon nanotubes;

[0025] Figure 2 This is a diagram of the synthesis reaction of the intermediate;

[0026] Figure 3 This is a synthesis reaction diagram of the modifier;

[0027] Figure 4 This is a diagram of the synthesis reaction of modified carbon nanotubes. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In this embodiment, it should be noted that the following parts are by weight; there are no special restrictions on the purchasers of all raw materials involved in this invention, and they include, for example: the copper-aluminum rod is an AlCu30 alloy; the multi-walled carbon nanotube is SRM2482, provided by Dongguan Jingyuan Experimental Technology Co., Ltd.; the low-density polyethylene is M202, manufactured by Asia Polymer; the high-density polyethylene is CRP100N, manufactured by Sichuan Petrochemical; PE-g-GMA is maleic anhydride grafted polyethylene, industrial grade, manufactured by LyondellBasell. KH550 specification is AR, manufacturer is Sinopharm; antioxidant model is 1098, manufacturer is BASF; polytetrafluoroethylene resin CAS is 9002-84-0, manufacturer is Shanghai Yuanye Biotechnology Co., Ltd.; polyoxymethylene resin CAS is 26780-50-7, manufacturer is Merck; flusulfanilamide product number is 46325-100MG-R, manufacturer is Sigma-Aldrich; barium sulfate product number is HY-A10, manufacturer is Kaili; cyclohexanone peroxide CAS is 12262-58-7, manufacturer is Maclean's.

[0030] The preparation method of modified carbon nanotubes is as follows:

[0031] Step 1: Preparation of the modifier: (1) Mix 1 part of 2-methylene-1,3-propanediol and 1.75 parts of p-methylbenzoyl chloride, add pyridine, and react at 80°C for 4 hours to obtain an intermediate; (2) Add 1 part of the intermediate and 0.65 parts of 6-aminonicotinic acid to cyclohexane, add 0.5 parts of concentrated sulfuric acid while stirring, react at 82°C for 7 hours, rotary evaporate and purify to obtain the modifier;

[0032] Step 2: Preparation of carboxylated carbon nanotubes: Multi-walled carbon nanotubes were added to a mixed acid (the ratio of multi-walled carbon nanotubes to mixed acid was 1g:10mL, and the mixed acid was composed of sulfuric acid and nitric acid in a volume ratio of 3:1), ultrasonically dispersed, stirred at 75°C for 3 hours, washed and dried to obtain carboxylated carbon nanotubes.

[0033] Step 3: Preparation of modified carbon nanotubes: 10 parts of carboxylated carbon nanotubes and 15 parts of modifier were added to cyclohexane in sequence, followed by 4 parts of dicyclohexylcarbodiimide and 4 parts of 4-dimethylaminopyridine. The mixture was reacted at 82°C for 2-3 hours, washed, dried, and ground to obtain modified carbon nanotubes.

[0034] The method for preparing the shaped conductor core is as follows:

[0035] Step 1: Drawing and annealing of the core monofilament: The copper-aluminum rod (copper to aluminum ratio of 1:8) is preheated at 45°C, then drawn into a monofilament with a diameter of 2.5mm, and then homogenized and annealed: the annealing temperature is 300°C, the annealing time is 50min, and it is naturally cooled to room temperature to obtain the copper-aluminum monofilament.

[0036] Step 2: Core winding: Four copper and aluminum monofilaments are wound without retraction at 50°C, and glue is injected at the joint of the monofilament winding to obtain a shaped conductor core.

[0037] Example 1: A manufacturing process for a high-frequency anti-interference cable for testing, comprising the following steps:

[0038] S1: Mix 80 parts of polyethylene (20 parts of low-density polyethylene and 60 parts of high-density polyethylene), 5 parts of PE-g-GMA, 8 parts of modified carbon nanotubes and 5 parts of antioxidant 1098 evenly to obtain the insulation layer raw material.

[0039] S2: Mix 50 parts of polytetrafluoroethylene resin, 25 parts of polyoxymethylene resin, 5 parts of modified carbon nanotubes, 2 parts of cyclohexanone peroxide, 0.5 parts of flusulfanilamide and 0.8 parts of barium sulfate evenly to obtain the raw material for the outer protective layer.

[0040] S3: Add the insulation layer material and the shaped conductor core to the extruder and extrude them on the surface once: the temperature is 150℃ and the pressure is 60MPa to obtain the insulation layer, which is cable A; Add the outer protective layer material and cable A to the extruder and extrude them on the surface twice: the temperature is 120℃ and the pressure is 55MPa to obtain the outer protective layer; Degas: the temperature is 80min and the time is 18h to obtain the high-frequency anti-interference cable.

[0041] Example 2: A manufacturing process for a high-frequency anti-interference cable for testing, comprising the following steps:

[0042] S1: Mix 83 parts of polyethylene (21 parts of low-density polyethylene and 62 parts of high-density polyethylene), 6 parts of PE-g-GMA, 13 parts of modified carbon nanotubes and 6 parts of antioxidant 1098 evenly to obtain the insulation layer raw material.

[0043] S2: Mix 60 parts of polytetrafluoroethylene resin, 30 parts of polyoxymethylene resin, 8 parts of modified carbon nanotubes, 3 parts of cyclohexanone peroxide, 1.2 parts of flusulfanilamide and 1.3 parts of barium sulfate evenly to obtain the raw material for the outer protective layer.

[0044] S3: Add the insulation layer material and the shaped conductor core to the extruder and extrude them on the surface once: the temperature is 180℃ and the pressure is 105MPa to obtain the insulation layer, which is cable A; Add the outer protective layer material and cable A to the extruder and extrude them on the surface twice: the temperature is 125℃ and the pressure is 95MPa to obtain the outer protective layer; Degas: the temperature is 100min and the time is 20h to obtain the high-frequency anti-interference cable.

[0045] Example 3: A manufacturing process for a high-frequency anti-interference cable for testing, comprising the following steps:

[0046] S1: Mix 82 parts of polyethylene (21 parts of low-density polyethylene and 61 parts of high-density polyethylene), 6 parts of PE-g-GMA, 12 parts of modified carbon nanotubes and 6 parts of antioxidant 1098 evenly to obtain the insulation layer raw material.

[0047] S2: Mix 55 parts of polytetrafluoroethylene resin, 28 parts of polyoxymethylene resin, 6 parts of modified carbon nanotubes, 2 parts of cyclohexanone peroxide, 1 part of flusulfanilamide and 1.2 parts of barium sulfate evenly to obtain the raw material for the outer protective layer.

[0048] S3: Add the insulation layer material and the shaped conductor core to the extruder and extrude them on the surface once: the temperature is 160℃ and the pressure is 80MPa to obtain the insulation layer, which is cable A; Add the outer protective layer material and cable A to the extruder and extrude them on the surface twice: the temperature is 124℃ and the pressure is 60MPa to obtain the outer protective layer; Degas: the temperature is 90min and the time is 19h to obtain the high-frequency anti-interference cable.

[0049] Comparative Example 1: The modified carbon nanotubes were replaced with carboxylated carbon nanotubes, and the rest was the same as in Example 3, as follows:

[0050] S1: Mix 82 parts of polyethylene (21 parts of low-density polyethylene and 61 parts of high-density polyethylene), 6 parts of PE-g-GMA, 12 parts of carboxylated carbon nanotubes and 6 parts of antioxidant 1098 evenly to obtain the insulation layer raw material.

[0051] S2: Mix 55 parts of polytetrafluoroethylene resin, 28 parts of polyoxymethylene resin, 6 parts of carboxylated carbon nanotubes, 2 parts of cyclohexanone peroxide, 1 part of flusulfanilamide and 1.2 parts of barium sulfate evenly to obtain the raw material for the outer protective layer.

[0052] S3: Add the insulation layer material and the shaped conductor core to the extruder and extrude them on the surface once: the temperature is 160℃ and the pressure is 80MPa to obtain the insulation layer, which is cable A; Add the outer protective layer material and cable A to the extruder and extrude them on the surface twice: the temperature is 124℃ and the pressure is 60MPa to obtain the outer protective layer; Degas: the temperature is 90min and the time is 19h to obtain the high-frequency anti-interference cable.

[0053] Comparative Example 2: Carbon nanotubes were modified using a silane coupling agent to replace the original modified carbon nanotubes. The rest of the process was the same as in Example 3, as detailed below:

[0054] Pre-preparation: Preparation of modified carbon nanotubes: 10 parts of carboxylated carbon nanotubes and 80 parts of 70wt% ethanol were ultrasonically dispersed for 1 hour, KH550 silane coupling agent was added, the pH was adjusted to 3.6 with hydrochloric acid, stirred for 30 minutes, stirred gently at 60℃ for 4 hours, washed and dried to obtain modified carbon nanotubes.

[0055] S1: Mix 82 parts of polyethylene (21 parts of low-density polyethylene and 61 parts of high-density polyethylene), 6 parts of PE-g-GMA, 12 parts of modified carbon nanotubes and 6 parts of antioxidant 1098 evenly to obtain the insulation layer raw material.

[0056] S2: Mix 55 parts of polytetrafluoroethylene resin, 28 parts of polyoxymethylene resin, 6 parts of modified carbon nanotubes, 2 parts of cyclohexanone peroxide, 1 part of flusulfanilamide and 1.2 parts of barium sulfate evenly to obtain the raw material for the outer protective layer.

[0057] S3: Add the insulation layer material and the shaped conductor core to the extruder and extrude them on the surface once: the temperature is 160℃ and the pressure is 80MPa to obtain the insulation layer, which is cable A; Add the outer protective layer material and cable A to the extruder and extrude them on the surface twice: the temperature is 124℃ and the pressure is 60MPa to obtain the outer protective layer; Degas: the temperature is 90min and the time is 19h to obtain the high-frequency anti-interference cable.

[0058] Comparative Example 3: An excess of modified carbon nanotubes was added compared to Example 3, and the rest was the same as in Example 3, as follows:

[0059] S1: Mix 82 parts of polyethylene (21 parts of low-density polyethylene and 61 parts of high-density polyethylene), 6 parts of PE-g-GMA, 30 parts of modified carbon nanotubes and 6 parts of antioxidant 1098 evenly to obtain the insulation layer raw material.

[0060] S2: Mix 55 parts of polytetrafluoroethylene resin, 28 parts of polyoxymethylene resin, 6 parts of modified carbon nanotubes, 2 parts of cyclohexanone peroxide, 1 part of flusulfanilamide and 1.2 parts of barium sulfate evenly to obtain the raw material for the outer protective layer.

[0061] S3: Add the insulation layer material and the shaped conductor core to the extruder and extrude them on the surface once: the temperature is 160℃ and the pressure is 80MPa to obtain the insulation layer, which is cable A; Add the outer protective layer material and cable A to the extruder and extrude them on the surface twice: the temperature is 124℃ and the pressure is 60MPa to obtain the outer protective layer; Degas: the temperature is 90min and the time is 19h to obtain the high-frequency anti-interference cable.

[0062] Comparative Example 4: The polyethylene used was a single type of low-density polyethylene, and the rest was the same as in Example 3, as follows:

[0063] S1: Mix 82 parts of low-density polyethylene, 6 parts of PE-g-GMA, 12 parts of modified carbon nanotubes and 6 parts of antioxidant 1098 evenly to obtain the insulation layer raw material;

[0064] S2: Mix 55 parts of polytetrafluoroethylene resin, 28 parts of polyoxymethylene resin, 6 parts of modified carbon nanotubes, 2 parts of cyclohexanone peroxide, 1 part of flusulfanilamide and 1.2 parts of barium sulfate evenly to obtain the raw material for the outer protective layer.

[0065] S3: Add the insulation layer material and the shaped conductor core to the extruder and extrude them on the surface once: the temperature is 160℃ and the pressure is 80MPa to obtain the insulation layer, which is cable A; Add the outer protective layer material and cable A to the extruder and extrude them on the surface twice: the temperature is 124℃ and the pressure is 60MPa to obtain the outer protective layer; Degas: the temperature is 90min and the time is 19h to obtain the high-frequency anti-interference cable.

[0066] Testing Experiments: The insulation material from the examples and comparative examples was melt-extruded to form samples of 22mm × 10.2mm × 3mm. Waveguide methods were used with a vector network analyzer to test the samples in the X-band (8.2-12.4Hz). The high-frequency anti-interference cables prepared in the examples and comparative examples were tested for their elongation at break and tensile strength according to the national standard GB / T1040-2006. The test data are shown in Table 1.

[0067]

[0068] Table 1

[0069] Conclusion: The above data shows that the addition of modified carbon nanotubes in Examples 1-3 introduced carbon-based groups that can absorb electromagnetic waves through dipole vibrations; the introduced benzene rings and carbon-carbon double bonds can absorb electromagnetic waves through π-π and n-π electronic transitions; and the carbon nanotubes themselves can absorb electromagnetic waves through electron conduction in the carbon network and surface plasmon resonance, thus improving the electromagnetic shielding effect of the cable. Simultaneously, the addition of modified carbon nanotubes improves the mechanical properties of the cable. Comparative Example 1 directly added carboxylated carbon nanotubes, resulting in a decrease in electromagnetic shielding and mechanical properties compared to Example 3; in Comparative Example 2, carbon nanotubes were modified using a silane coupling agent, resulting in a decrease in electromagnetic shielding and mechanical properties compared to Example 3; in Comparative Example 3, an excess of modified carbon nanotubes was added compared to Example 3, resulting in a decrease in electromagnetic shielding and mechanical properties compared to Example 3; in Comparative Example 4, the polyethylene used was single low-density polyethylene, resulting in a decrease in electromagnetic shielding and mechanical properties compared to Example 3.

[0070] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A process for processing a high-frequency interference-resistant cable for testing, characterized in that: Includes the following steps: S1: Mix polyethylene, PE-g-GMA, modified carbon nanotubes and antioxidants evenly to obtain the insulation layer raw material; S2: Mix polytetrafluoroethylene resin, polyoxymethylene resin, modified carbon nanotubes, cyclohexanone peroxide, flusulfanilamide and barium sulfate evenly to obtain the raw material for the outer protective layer; S3: Add the insulation layer material and the shaped conductor core into the extruder and extrude them on the surface once to obtain the insulation layer, which is cable A; add the outer protective layer material and cable A into the extruder and extrude them on the surface a second time to obtain the outer protective layer; Degassing yields high-frequency anti-interference cables; The insulating layer raw material Includes the following substances: by weight, 80-83 parts polyethylene, 5-6 parts PE-g-GMA, 8-13 parts modified carbon nanotubes, and 5-6 parts antioxidant; The outer protective layer raw materials include the following substances: by weight, 50-60 parts polytetrafluoroethylene resin, 25-30 parts polyoxymethylene resin, 5-8 parts modified carbon nanotubes, 2-3 parts initiator, 0.5-1.2 parts flusulfanilamide and 0.8-1.3 parts barium sulfate; The polyethylene includes low-density polyethylene and high-density polyethylene in a mass ratio of (0.5-1):(3-3.5); The method for preparing the modified carbon nanotubes is as follows: Step 1: Preparation of the modifier: (1) Mix 2-methylene-1,3-propanediol and p-methylbenzoyl chloride, add pyridine, and react at 75-80℃ for 3-4 hours to obtain an intermediate; in the intermediate, the mass ratio of 2-methylene-1,3-propanediol to p-methylbenzoyl chloride is 1:1.75; the mass ratio of the intermediate to 6-aminonicotinic acid is 1:(0.6-0.7); the amount of concentrated sulfuric acid added accounts for 0.5-0.6wt% of the intermediate; multi-walled carbon nanotubes and the mixture The acid ratio is 1g:10mL, and the mixed acid is composed of sulfuric acid and nitric acid in a volume ratio of 3:1; the raw materials of the modified carbon nanotubes include the following components, by weight: 10-15 parts carboxylated carbon nanotubes, 10-20 parts modifier, 2-5.5 parts dicyclohexylcarbodiimide, and 3.5-5 parts 4-dimethylaminopyridine; (2) the intermediate and 6-aminonicotinic acid are added to cyclohexane, concentrated sulfuric acid is added, and the reaction is carried out at 80-85℃ for 6-7h. The mixture is then rotary evaporated and purified to obtain the modifier; Step 2: Preparation of carboxylated carbon nanotubes: Multi-walled carbon nanotubes are added to mixed acid, ultrasonically dispersed, stirred at 70-80℃ for 2-3 hours, washed and dried to obtain carboxylated carbon nanotubes. Step 3: Preparation of modified carbon nanotubes: Carboxylated carbon nanotubes and modifiers are added sequentially to cyclohexane, followed by dicyclohexylcarbodiimide and 4-dimethylaminopyridine. The mixture is reacted at 80-85℃ for 2-3 hours, washed, dried, and ground to obtain modified carbon nanotubes.

2. The processing technology of high-frequency anti-interference cable for testing according to claim 1, characterized in that: The process parameters for primary extrusion molding are: temperature 150-180℃, pressure 60-105MPa; the process parameters for secondary extrusion molding are: temperature 120-125℃, pressure 55-95MPa; the process parameters for degassing are: temperature 80-100min, time 18-20h.

3. The processing technology of high-frequency anti-interference cable for testing according to claim 1, characterized in that: The method for preparing the shaped conductor core is as follows: (1) drawing and annealing of the wire core monofilament: drawing the copper-aluminum rod to a monofilament with a diameter of 2-3 mm, and performing homogenization annealing, and naturally cooling to room temperature to obtain copper-aluminum monofilament; (2) winding of the wire core: winding 3-4 copper-aluminum monofilaments at 30-50℃ without retraction, and injecting glue at the connection of the monofilament winding to obtain the shaped conductor core.

4. The processing method of the high-frequency anti-interference cable for testing according to claim 3, characterized in that: The copper-aluminum rod has a copper to aluminum ratio of (1-1.2):(8-8.2). Before drawing, it needs to be heated to 40-50℃, the annealing temperature is 300-350℃, and the annealing time is 30-50 minutes.

5. A high-frequency anti-interference cable obtained by the processing technology of a high-frequency anti-interference cable for testing according to any one of claims 1-4.

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