Anti-interference low-voltage multi-layer cable and preparation process thereof

Abstract

The present application relates to the technical field of cable preparation, in particular to an anti-interference low-voltage multi-layer cable and a preparation process thereof. The preparation process of the anti-interference low-voltage multi-layer cable comprises the following steps: twisting a silver-plated copper conductor and aramid yarn around a tight-fitting optical fiber central unit to obtain a cable core; wrapping a shielding layer outside the cable core; weaving a drain wire and a silver-plated copper wire outside the cable core wrapped with the shielding layer to obtain a double-layer shielding cable; extruding an insulating sheath raw material, injection molding to wrap the cable core with the completed shielding layer, electron irradiation crosslinking to obtain the anti-interference low-voltage multi-layer cable. The cable preparation process realizes high integration of functions and structural reinforcement, twists the silver-plated copper conductor and high-strength aramid yarn together, provides excellent electrical conductivity, greatly enhances the tensile strength and mechanical impact resistance of the cable core, and enables it to withstand complex installation stress and long-term running tension load.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable preparation, in particular to an anti-interference low-voltage multi-layer cable and a preparation process thereof. BACKGROUND

[0002] Low-voltage cable generally refers to a cable used for transmitting and distributing electric energy with an alternating voltage of 1kV and below or a direct voltage of 1.5kV and below. It is the most common and largest quantity cable type in the power system, and is widely used in power transmission from the power grid terminal to various fields of our daily life and industrial production. The traditional low-voltage cable is mainly a power transmission cable or a signal transmission cable with single function, and the tensile strength thereof mainly depends on the metal conductor itself, so the mechanical strength is limited. In the occasion requiring frequent movement, dragging or long-distance vertical laying, the cable is easily damaged due to excessive mechanical stress, thereby affecting the power supply safety and system reliability. In addition, in terms of electromagnetic compatibility, the increasingly complex electromagnetic environment puts high requirements on the shielding effectiveness of the cable. The existing low-voltage cable generally adopts a woven shielding layer or a wrapping shielding layer. The single type of shielding structure is often difficult to cope with wide-band electromagnetic interference, and the woven shielding layer has inherent gaps, resulting in poor shielding effect on high-frequency interference. The single wrapping film shielding layer has poor mechanical strength and is inconvenient to ground.

[0003] Meanwhile, the polypropylene sheath layer material of the low-voltage cable has the problem of insufficient dispersion uniformity, which may cause performance degradation of the sheath layer, such as insulation performance fluctuation and wear resistance reduction. In view of the above problems, the present application provides an anti-interference low-voltage multi-layer cable and a preparation process thereof. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the present application is to provide an anti-interference low-voltage multi-layer cable and a preparation process thereof.

[0005] A preparation process of an anti-interference low-voltage multi-layer cable, specifically comprising the following steps:

[0006] A tight-fitting optical fiber is placed as a central unit, a silver-plated copper conductor and aramid yarn are twisted together at a speed of 1500-1800 rpm by a high-speed twisting machine, and are twisted together around the central unit, wherein the twisted wire diameter is 0.04-1.8 mm, and the twisted cross section is 3-6.5 mm 2 to obtain a cable core;

[0007] A shielding layer film belt disc is installed on a high-speed wrapping machine, the wrapping pitch of the wrapping machine is adjusted to 20-50 mm, the wrapping angle is adjusted to 40°-60°, and a shielding layer is wrapped around the cable core;

[0008] Before the braiding process starts, a drainage wire is placed parallel to the cable core body which has been wrapped with a shielding layer, then a silver-plated copper wire coil is installed on a high-speed braiding machine, the cable core body integrated with the drainage wire is passed through the center of the braiding machine, the braiding pitch of the braiding machine is adjusted to 20-40 mm, the braiding angle is adjusted to 50-70°, and the spindle speed is adjusted to 800-1400 rpm, a double-layer shielding layer is formed, and a double-layer shielding cable is obtained;

[0009] The 2-4 mass parts of the insulation sheath raw material, 3-5 mass parts of the composite lubricant, 2-4 mass parts of the plasticizer epoxidized soybean oil, and 20-40 mass parts of polypropylene are extruded through a double-screw extruder at 190-200°C, the extrudate is first cooled at 60-65°C, then cooled in a 30-45°C water tank, pelletized, and then the obtained pellets are heated and injection molded at 170-210°C using an injection molding machine, and after cooling, a polypropylene insulation cable protective sheath is prepared, which is wrapped around the cable core body with a completed shielding layer and cooled and shaped, and then the polypropylene insulation cable protective sheath is subjected to electron irradiation crosslinking at an irradiation dose of 100-300 kGy for 10-15 min to form a sheath layer, and an anti-interference low-voltage multi-layer cable is obtained.

[0010] Further, the shielding layer film is specifically an aluminum-plated polyester film with a thickness of 12-50 μm or a nano-ceramic coated polyimide film.

[0011] Further, the drainage wire is specifically a soft annealed tinned copper wire with a diameter of 0.3-0.5 mm.

[0012] Further, the pellet size is 3 mm X 3 mm or 4 mm X 4 mm.

[0013] Further, the preparation process of the insulation sheath raw material is specifically as follows:

[0014] 3-6 mass parts of β-cyclodextrin are mixed with 1-2 mass parts of graphene oxide, ball-milled for 1-2 hours, the ball-milled product is transferred to 100-110 mass parts of deionized water, dispersed by ultrasonic action, then centrifuged, the solid precipitate is collected, and the obtained solid precipitate is dried at 70-75°C for 24-25 hours, and then ground to obtain a ground powder;

[0015] The alkali solution and the Cu / Zn / Al mixed salt solution are added into the ground powder, the molar ratio of Cu, Zn and Al in the Cu / Zn / Al mixed salt solution is 2:1:1, the mixture is stirred at a rotating speed of 500-600 rpm for 30-35 minutes, and is subjected to ultrasonic dispersion, 5-8 parts by mass of the additive is added, and the mixture is reacted at a rotating speed of 300-400 rpm at 60-80 DEG C for 2-3 hours, and is subjected to nitrogen treatment at 240-250 DEG C for 2-2.5 hours, the product is subjected to suction filtration, washing and drying, and the dried product is subjected to high temperature treatment at 400-420 DEG C under nitrogen atmosphere for 1-1.5 hours, and is subjected to tabletting and granulation to obtain the insulating sheath raw material.

[0016] Further, the preparation process of the composite lubricant is specifically as follows:

[0017] The liquid paraffin 4-8 parts by mass, cottonseed oil 1-3 parts by mass, white oil 1-1.5 parts by mass and gum arabic 2-3 parts by mass are mixed, and the mixture is stirred at a rotating speed of 300-350 rpm at 50-60 DEG C for 10-15 minutes to prepare a paraffin emulsion, the paraffin emulsion 8-10 parts by mass, silicon lubricating grease 4-5 parts by mass and stearic acid 1-3 parts by mass are added into a stirring ball mill, and the silicon dioxide 1-1.5 parts by mass and the stabilizer polyvinyl alcohol 0.5-1.5 parts by mass are further added, and the mixture is stirred at a rotating speed of 800-900 rpm for 20-25 minutes, and the obtained product is the composite lubricant.

[0018] Further, the additive is specifically prepared by mixing formamide and glycerol at a volume ratio of 1:3.

[0019] Further, the alkali solution is prepared by mixing sodium carbonate solution and sodium hydroxide solution at a volume ratio of 1:(1-2).

[0020] An anti-interference low-voltage multi-layer cable is prepared by the preparation process of the anti-interference low-voltage multi-layer cable.

[0021] Compared with the prior art, the present application has at least the following beneficial effects:

[0022] 1. The cable preparation process of the application realizes high integration of functions and structural reinforcement, takes tight-fitting optical fibers as the center unit, and creatively integrates data transmission and power transmission into one, and at the same time, braids silver-plated copper conductors and high-strength aramid yarns to provide excellent electrical conductivity while greatly enhancing the tensile strength and mechanical impact resistance of the cable core, so that it can withstand complex installation stress and long-term running tension load; and by adopting the composite structure of double-layer shielding of wrapping film and metal braid, the two shielding methods are reasonably combined, the inner layer of wrapping film provides a high-coverage shielding layer to effectively resist high-frequency electromagnetic interference, and the outer layer of metal braid provides a low-impedance low-frequency protection, and also bears a certain mechanical protection capability, and the two work together to ensure stable and high-level shielding effect in a wide frequency range from low frequency to high frequency, thereby effectively improving the anti-interference ability and stability of the cable.

[0023] 2. The application forms a hydrotalcite-derived metal oxide composite by treating Cu / Zn / Al mixed salt with an alkaline solution prepared from sodium carbonate and sodium hydroxide and calcining, in the process, the beta-cyclodextrin glycosidic bond is not broken in the low-temperature reaction at 60 DEG C and the medium-temperature solidification stage at 240 DEG C, and the ring cavity structure and surface hydroxyl retention rate are high, which enables the beta-cyclodextrin to anchor Cu / Zn / Al ions in the interlayer of graphene oxide through the dual action of cavity encapsulation and hydroxyl complexation, realize the function of intercalation framework, formate and glycerol are added in advance and participate in the complexation reaction at 60 DEG C, the formate is inserted into the interlayer of graphene oxide to weaken the electrostatic attraction, the polyhydroxy of glycerol forms a hydrogen bond network with the beta-cyclodextrin to fix the metal-support composite structure and inhibit the interlayer stacking, and the nitrogen treatment at 40 DEG C for 2 hours makes the metal hydroxide partially dehydrated to form a hydrotalcite-derived phase with moderate crystallinity, the layered structure of which embeds the beta-cyclodextrin / graphene oxide framework into the interlayer to form a stable composite structure, thereby improving the thermal stability of the filler.

[0024] 3. The application applies the composite lubricant prepared by compounding paraffin emulsion oil, silicon lubricating grease and stearic acid to the polypropylene system. The paraffin emulsion oil provides basic lubrication, reduces the melt viscosity and improves the extrusion processability; the polarity of stearic acid and paraffin emulsion oil is complementary, and they synergistically realize the balance of internal and external lubrication, effectively reduce the shear stress and interface friction; the silicon lubricating grease is further compounded with stearic acid and paraffin emulsion oil to form a high-efficiency protective layer, which significantly reduces the friction coefficient and improves the overall lubrication effect. The system makes the surface of the cable protective sleeve smoother, thereby enhancing its wear resistance and insulation performance.

[0025] 4、The application forms stable paraffin emulsion by stirring liquid paraffin, cottonseed oil, white oil and gum arabic under specific conditions; gum arabic as emulsifier co-emulsifies liquid paraffin and cottonseed oil, and constructs uniform composite lubricating system; cottonseed oil and white oil have excellent biodegradability, avoiding persistent pollution to soil and water, and outstanding environmental friendliness. Liquid paraffin, white oil and gum arabic are all low-toxic or non-toxic substances with high safety; in cable production, the lubricant can replace traditional chemical lubricant, significantly reducing environmental pollution, and meeting green manufacturing standards. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable a person skilled in the relevant art to implement and use the present disclosure.

[0027] Figure 1 A structure schematic diagram of an anti-interference low-voltage multi-layer cable used in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The anti-interference low-voltage multi-layer cable and the preparation process thereof provided by the present application are described in detail below in combination with the drawings and specific embodiments. It is explained here that, in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and other alternative ways can also be used by those skilled in the art to implement some known technologies; and the drawings are only used to more specifically describe the embodiments, and are not intended to specifically limit the present application.

[0029] Embodiment 1:

[0030] The preparation process of the anti-interference low-voltage multi-layer cable specifically includes the following steps:

[0031] A tight-fitting optical fiber is placed as a central unit, silver-plated copper conductors and aramid yarns are twisted by a high-speed twisting machine at a speed of 1500 rpm, and are twisted around the central unit together, wherein the twisted wire diameter is 0.04 mm, and the twisted cross section is 3 mm 2 to obtain a cable core;

[0032] A shielding layer film tape reel is installed on a high-speed wrapping machine, the shielding layer film is specifically an aluminum-plated polyester film with a thickness of 20 μm, the wrapping pitch of the wrapping machine is adjusted to 20 mm, the wrapping angle is 40°, and a shielding layer is wrapped around the cable core;

[0033] Before the braiding process starts, a drainage wire is placed parallel to the cable core body which has been wrapped with a shielding layer, the drainage wire is specifically a soft annealed tinned copper wire with a diameter of 0.3 mm, then a silver plated copper wire coil is installed on a high-speed braiding machine, the cable core body integrated with the drainage wire is passed through the center of the braiding machine, the braiding pitch of the braiding machine is adjusted to 20 mm, the braiding angle is adjusted to 50°, and the spindle speed is adjusted to 800 rpm, a double-layer shielding layer is formed, and a double-layer shielding cable is obtained;

[0034] The 2 parts of the insulation sheath raw material, 3 parts of the composite lubricant, 2 parts of the plasticizer epoxidized soybean oil and 20 parts of polypropylene are extruded by a double screw extruder at 190℃, the extrudate is first cooled to 60℃, then cooled in a 30℃ water tank, pelletized, the pellet size is 3mmX3mm, then the obtained pellets are heated and injection molded by an injection molding machine at 170℃, and after cooling, a polypropylene insulation cable protective sleeve is prepared, which is wrapped outside the cable core body with a completed shielding layer and cooled and shaped, and then the polypropylene insulation cable protective sleeve is subjected to electron irradiation crosslinking with an irradiation dose of 100kGy for 10min, a sheath layer is formed, and an anti-interference low-voltage multi-layer cable is obtained.

[0035] The preparation process of the insulation sheath raw material is specifically as follows:

[0036] 3 parts of β-cyclodextrin and 1 part of graphene oxide are mixed and ball milled for 1 hour, the ball milled product is transferred to 100 parts of deionized water, dispersed by ultrasonic action, then centrifuged, and the solid precipitate is collected, the obtained solid precipitate is dried at 70℃ for 24 hours, and then ground to obtain a ground powder;

[0037] 2 parts of alkali solution and 4 parts of Cu / Zn / Al mixed salt solution are added to the ground powder, stirred at a speed of 500r / min for 30min, and ultrasonically dispersed, 5 parts of an additive is added, and reacted at a speed of 300r / min for 2 hours at 60℃, then treated with nitrogen at 240℃ for 2 hours, the product is filtered, washed and dried, and the dried product is placed in a tube furnace and treated at 400℃ for 1 hour in a nitrogen atmosphere, and then pressed and granulated to obtain the insulation sheath raw material;

[0038] The additive is specifically prepared by mixing formamide and glycerol at a volume ratio of 1:3, and the molar ratio of Cu, Zn and Al in the Cu / Zn / Al mixed salt solution is 2:1:1.

[0039] The preparation process of the composite lubricant is specifically as follows:

[0040] The liquid paraffin 4 parts by mass, cottonseed oil 1 part by mass, white oil 1 part by mass and gum arabic 2 parts by mass are mixed, stirred at 50℃ for 10 minutes at a speed of 300 rpm, and a paraffin emulsion is prepared;

[0041] The paraffin emulsion 8 parts by mass, silicon lubricating grease 4 parts by mass and stearic acid 1 part by mass are added into a stirring ball mill, and then the silicon dioxide 1 part by mass and the stabilizer polyvinyl alcohol 0.5 parts by mass are added, stirred and mixed at a speed of 800 rpm for 20 minutes, and the obtained product is the composite lubricant.

[0042] Example 2:

[0043] A preparation process of an anti-interference low-voltage multi-layer cable, specifically comprising the following steps:

[0044] A tight-fitting optical fiber is placed as a central unit, and a silver-plated copper conductor and aramid yarn are twisted together at a speed of 1600 rpm by a high-speed twisting machine, and are twisted together around the central unit, wherein the twisted wire diameter is 1 mm, and the twisted cross section is 5 mm 2 , to obtain a cable core;

[0045] A shielding layer film tape reel is installed on a high-speed wrapping machine, the shielding layer film is specifically an aluminum-plated polyester film with a thickness of 20 μm, the wrapping pitch of the wrapping machine is adjusted to 40 mm, and the wrapping angle is 50°, and a layer of shielding layer is wrapped outside the cable core;

[0046] Before the braiding process starts, a drainage wire is placed in parallel on the cable core which has been wrapped with the shielding layer, the drainage wire is specifically a soft state tinned copper wire with a diameter of 0.4 mm after annealing treatment, and then a silver-plated copper wire reel is installed on a high-speed braiding machine, the cable core integrated with the drainage wire is passed through the center of the braiding machine, the braiding pitch of the braiding machine is adjusted to 30 mm, the braiding angle is 60°, and the spindle speed is 1100 rpm, a double-layer shielding layer is formed, and a double-layer shielding cable is obtained;

[0047] 3 parts by mass of insulation sheath raw material, 4 parts by mass of composite lubricant, 3 parts by mass of plasticizer epoxidized soybean oil and 30 parts by mass of polypropylene are extruded by a double screw extruder at 195℃, the extrudate is first cooled by 62℃, and then cooled by a 38℃ water tank, and then pelletized, the pellet size is 3mmX3mm, the obtained pellets are then heated and injection molded by an injection molding machine at 190℃, and after cooling, a polypropylene insulation cable protective sleeve is prepared, which is wrapped outside the cable core which has completed the shielding layer, and is cooled and shaped, and then the polypropylene insulation cable protective sleeve is subjected to electronic irradiation crosslinking with an irradiation dose of 200 kGy for 12 minutes, to form a sheath layer, and an anti-interference low-voltage multi-layer cable is obtained.

[0048] The preparation process of the insulation sheath raw material is specifically as follows:

[0049] 3 parts by mass of β-cyclodextrin is mixed with 1 part by mass of graphene oxide, and ball milling is performed for 2 hours; the ball-milled product is transferred to 100 parts by mass of deionized water, and dispersion is performed by ultrasonic treatment, followed by centrifugal separation; the solid precipitate is collected, and the obtained solid precipitate is dried at 75℃ for 25 hours; after drying, the material is ground to obtain a ground powder;

[0050] 2 parts by mass of an alkali solution and 4 parts by mass of a Cu / Zn / Al mixed salt solution are added to the ground powder, stirring is performed at a rotation speed of 600 rpm for 35 minutes, ultrasonic dispersion is performed, 5 parts by mass of an additive is added, and reaction is performed at a rotation speed of 400 rpm at 80℃ for 3 hours; then, nitrogen treatment is performed at 250℃ for 2.5 hours; the product is subjected to suction filtration, washing, and drying; the dried product is placed in a tube furnace, and high-temperature treatment is performed at 420℃ under a nitrogen atmosphere for 1.5 hours; and tablet granulation is performed to obtain an insulation sheath raw material;

[0051] The additive is specifically prepared by mixing formamide and glycerol at a volume ratio of 1:3; and in the Cu / Zn / Al mixed salt solution, the molar ratio of Cu, Zn, and Al is 2:1:1.

[0052] The preparation process of the composite lubricant is specifically as follows:

[0053] 4 parts by mass of liquid paraffin, 1 part by mass of cottonseed oil, 1 part by mass of white oil, and 2 parts by mass of gum arabic are mixed, stirring is performed at a rotation speed of 350 rpm at 60℃ for 15 minutes, and a paraffin emulsion is prepared;

[0054] 8 parts by mass of the paraffin emulsion, 4 parts by mass of silicon lubricating grease, and 1 part by mass of stearic acid are added to a stirring ball mill, 1 part by mass of silicon dioxide and 0.5 parts by mass of a stabilizer polyvinyl alcohol are further added, stirring is performed at a rotation speed of 900 rpm for 25 minutes, and the obtained product is a composite lubricant.

[0055] Example 3:

[0056] A preparation process of an anti-interference low-voltage multi-layer cable specifically includes the following steps:

[0057] A tight-fitting optical fiber is placed as a central unit, a silver-plated copper conductor and aramid yarn are twisted together at a rotation speed of 1800 rpm by a high-speed stranding machine, and the twisted conductor and the aramid yarn are twisted together around the central unit, wherein the twisted wire diameter is 1.8 mm, and the twisted cross section is 6.5 mm 2 , to obtain a cable core;

[0058] A shielding layer film belt disc is installed on a high-speed wrapping machine, the shielding layer film is specifically an aluminum-plated polyester film with a thickness of 20 μm, the wrapping pitch of the wrapping machine is adjusted to 50 mm, and the wrapping angle is 60°; and a shielding layer is wrapped around the cable core;

[0059] Before the braiding process starts, a drainage wire is placed parallel to the cable core body which has been wrapped with a shielding layer, the drainage wire is specifically a soft annealed tinned copper wire with a diameter of 0.5 mm, then a silver plated copper wire coil is installed on a high-speed braiding machine, the cable core body integrated with the drainage wire is passed through the center of the braiding machine, the braiding pitch of the braiding machine is adjusted to 40 mm, the braiding angle is adjusted to 70°, and the spindle speed is adjusted to 1400 rpm, a double-layer shielding layer is formed, and a double-layer shielding cable is obtained;

[0060] The 4 parts of the insulation sheath raw material, 5 parts of the composite lubricant, 4 parts of the plasticizer epoxidized soybean oil and 40 parts of polypropylene are extruded by a double screw extruder at 200℃, the extrudate is first cooled by 65℃, then cooled by a 45℃ water tank, pelletized, the pellet size is 4mmX4mm, then the obtained pellets are heated and injection molded by an injection molding machine at 210℃, and after cooling, a polypropylene insulation cable protective sleeve is prepared, which is wrapped outside the cable core body with a completed shielding layer and cooled and shaped, and then the polypropylene insulation cable protective sleeve is subjected to electron irradiation crosslinking with an irradiation dose of 300kGy for 15min, a sheath layer is formed, and an anti-interference low-voltage multi-layer cable is obtained.

[0061] The preparation process of the insulation sheath raw material is specifically as follows:

[0062] 6 parts of β-cyclodextrin and 2 parts of graphene oxide are mixed and ball milled for 1 hour, the ball milled product is transferred to 110 parts of deionized water, dispersed by ultrasonic action, then centrifuged, the solid precipitate is collected, and the obtained solid precipitate is dried at 70℃ for 24 hours, then the dried material is ground to obtain a ground powder;

[0063] 3 parts of alkali solution and 5 parts of Cu / Zn / Al mixed salt solution are added to the ground powder, stirred at a speed of 500r / min for 30min, and ultrasonically dispersed, 8 parts of an additive is added, and reacted at a speed of 300r / min for 2 hours at 60℃, then treated with nitrogen at 240℃ for 2 hours, the product is filtered, washed and dried, the dried product is placed in a tube furnace and treated at 400℃ for 1 hour in a nitrogen atmosphere, and then pressed and granulated to obtain an insulation sheath raw material;

[0064] The additive is specifically prepared by mixing formamide and glycerol at a volume ratio of 1:3, and the molar ratio of Cu, Zn and Al in the Cu / Zn / Al mixed salt solution is 2:1:1.

[0065] The preparation process of the composite lubricant is specifically as follows:

[0066] The liquid paraffin 8 parts by mass, cottonseed oil 3 parts by mass, white oil 1.5 parts by mass and gum arabic 3 parts by mass are mixed, stirred at 50°C for 10 minutes at a speed of 300 rpm, and a paraffin emulsion is prepared;

[0067] The paraffin emulsion 10 parts by mass, silicon lubricating grease 5 parts by mass and stearic acid 3 parts by mass are added to a stirring ball mill, and then silicon dioxide 1.5 parts by mass and stabilizer polyvinyl alcohol 1.5 parts by mass are added. The mixture is stirred and mixed at a speed of 800 rpm for 20 minutes, and the obtained product is a composite lubricant.

[0068] Comparative Example 1:

[0069] Comparative Example 1 is a commercially available polypropylene insulated cable protective sleeve. The commercially available polypropylene insulated cable protective sleeve is wrapped around the outer layer of the cable core bundled by the optical cable to prepare an anti-interference low-voltage multi-layer cable, which is referred to as Comparative Example 1.

[0070] Comparative Example 2:

[0071] Comparative Example 2 is different from Example 1 in that no graphene oxide is added, and the remaining steps are unchanged. The prepared anti-interference low-voltage multi-layer cable is referred to as Comparative Example 2.

[0072] Comparative Example 3:

[0073] Comparative Example 3 is different from Example 1 in that no additive is added, but the additive is replaced by glycerol, and the remaining steps are unchanged. The prepared anti-interference low-voltage multi-layer cable is referred to as Comparative Example 3.

[0074] Comparative Example 4:

[0075] Comparative Example 4 is different from Example 1 in that no additive is added in step S3, but the additive is replaced by formamide, and the remaining steps are unchanged. The prepared anti-interference low-voltage multi-layer cable is referred to as Comparative Example 4.

[0076] Comparative Example 5:

[0077] Comparative Example 5 is different from Example 1 in that no silicon lubricating grease is added, and the remaining steps are unchanged. The prepared anti-interference low-voltage multi-layer cable is referred to as Comparative Example 5.

[0078] Comparative Example 6:

[0079] Comparative Example 6 is different from Example 1 in that no stearic acid is added, and the remaining steps are unchanged. The prepared anti-interference low-voltage multi-layer cable is referred to as Comparative Example 6.

[0080] Comparative Example 7:

[0081] Compared with Example 1, the difference of Comparative Example 7 is that the paraffin emulsion oil is not added, but is replaced by an industrial lubricant chlorinated paraffin-42, and the remaining steps are unchanged. The prepared anti-interference low-voltage multi-layer cable is denoted as Comparative Example 7.

[0082] The surface wear resistance of Examples 1-3 and Comparative Examples 1-4 is tested, and the testing instrument is a friction and wear testing machine. The rotation speed of the friction and wear testing machine is set to 400 revolutions per minute, the load is 100 N, and the experimental time is 1 hour. The wear amount is measured, and the experimental results are shown in Table 1.

[0083] Table 1

[0084]

[0085] The volume resistivity of Examples 1-3, Comparative Example 1, and Comparative Examples 5-7 is tested, and the results are shown in Table 2.

[0086] Table 2

[0087]

[0088] As can be seen from Table 1, the wear amount of Examples 1-3 is below 89 mg, while the wear amount of Comparative Example 1 is 93 mg. Comparative Example 1 is a commercially available product. It can be seen that the wear amount of the anti-interference low-voltage multi-layer cable of the present application is lower than that of the commercially available product, and the wear resistance is better than that of the commercially available product. However, the wear amount in Comparative Examples 2-4 further increases. It can be seen that only when the raw materials of the present application are combined can the synergistic effect be achieved to improve the wear resistance. The wear resistance of a single raw material is not as good as that of the examples.

[0089] As can be seen from Table 2, the volume resistivity of Examples 1-3 is 3.1 x 10 14 Ω·m, which is better than that of the commercially available product. However, the lubricant used in Comparative Example 7 is a chlorinated paraffin lubricant commonly used in industry. After adding it, the insulation performance is better than that of Comparative Examples 5 and 6, but is not as good as that of Examples 1-3. This indicates that the raw materials in Comparative Examples 5 and 6 need to be used in combination to achieve better results. The paraffin emulsion oil prepared by the present application has a better effect on improving the insulation performance of the cable.

[0090] Example 4:

[0091] An anti-interference low-voltage multi-layer cable is prepared by the preparation process of the anti-interference low-voltage multi-layer cable of Example 1, as shown in Figure 1 , which includes a cable core, a double-layer shielding layer, and a sheath layer.

[0092] The above embodiments are only illustrative of the principles of the present application and its efficacy, and are not intended to limit the present application. Any modification or change made by any person skilled in the art without departing from the spirit and scope of the present application shall be covered by the claims of the present application.

Claims

1. A process for the preparation of an interference-resistant low-voltage multi-layer cable, characterized in that, Specifically comprising the following steps: A tight-fitting optical fiber is placed as a center unit, silver-plated copper conductors and aramid yarns are twisted together by a high-speed twisting machine at a speed of 1500-1800 rpm, and are twisted together around the center unit, wherein the twisted wire diameter is 0.04-1.8 mm, and the twisted cross section is 3-6.5 mm 2 , to obtain a cable core Install the shielding layer film tape reel to the high-speed wrapping machine, adjust the wrapping pitch of the wrapping machine to 20-50 mm, the wrapping angle to 40-60°, and wrap a layer of shielding layer on the cable core body; Before the braiding process starts, place a drainage wire parallel to the cable core body that has been wrapped with the shielding layer, then install the silver-plated copper wire reel to the high-speed braiding machine, pass the cable core body integrated with the drainage wire through the center of the braiding machine, adjust the braiding pitch of the braiding machine to 20-40 mm, the braiding angle to 50-70°, and the spindle speed to 800-1400 rpm, form a double-layer shielding layer, and obtain a double-layer shielding cable; Extrude 2-4 parts by mass of the insulation sheath raw material, 3-5 parts by mass of the composite lubricant, 2-4 parts by mass of the plasticizer epoxidized soybean oil, and 20-40 parts by mass of polypropylene at 190-200°C through a double-screw extruder, first cool the extrudate at 60-65°C, then cool it in a 30-45°C water tank, pelletize, then heat and injection mold the obtained pellets at 170-210°C using an injection molding machine, cool, and obtain a polypropylene insulation cable protective sleeve, which is wrapped around the cable core body that has completed the shielding layer, and is cooled and shaped, and then subjected to electronic irradiation crosslinking at an irradiation dose of 100-300 kGy for 10-15 min to form a sheath layer, thereby obtaining an anti-interference low-voltage multi-layer cable; The composite lubricant specifically comprises: Mix 4-8 parts by mass of liquid paraffin, 1-3 parts by mass of cottonseed oil, 1-1.5 parts by mass of white oil, and 2-3 parts by mass of gum arabic at 50-60°C, stir at a speed of 300-350 rpm for 10-15 min, and obtain a paraffin emulsion, then add 8-10 parts by mass of the paraffin emulsion, 4-5 parts by mass of silicon lubricating grease, and 1-3 parts by mass of stearic acid to the stirring ball mill, further add 1-1.5 parts by mass of silicon dioxide and 0.5-1.5 parts by mass of the stabilizer polyvinyl alcohol, and stir and mix at a speed of 800-900 rpm for 20-25 min, and the obtained product is the composite lubricant; The insulation sheath raw material specifically comprises: Mix 3-6 parts by mass of β-cyclodextrin and 1-2 parts by mass of graphene oxide, ball mill for 1-2 hours, transfer the ball-milled product to 100-110 parts by mass of deionized water, disperse by ultrasonic action, then centrifuge and collect the solid precipitate, dry the obtained solid precipitate at 70-75°C for 24-25 hours, and grind the dried material to obtain a ground powder. The alkali solution and the Cu / Zn / Al mixed salt solution are added to the ground powder, the molar ratio of Cu, Zn and Al in the Cu / Zn / Al mixed salt solution is 2:1:1, the mixture is stirred at a speed of 500-600 rpm for 30-35 minutes, ultrasonic dispersion is performed, 5-8 parts by mass of the additive is added, the reaction is carried out at a speed of 300-400 rpm for 2-3 hours at 60-80℃, nitrogen treatment is carried out at 240-250℃ for 2-2.5 hours, the product is filtered, washed and dried, the dried product is placed in a tube furnace, high temperature treatment is carried out at 400-420℃ for 1-1.5 hours under nitrogen atmosphere, and tablet granulation is carried out to obtain the insulating sheath raw material; The alkali solution is prepared by mixing sodium carbonate solution and sodium hydroxide solution at a volume ratio of 1:(1-2); The additive is prepared by mixing formamide and glycerol at a volume ratio of 1:

3.

2. A process for the preparation of the low-voltage multi-layer cable according to claim 1, characterized in that, The shielding layer film is specifically an aluminum-plated polyester film or a nano-ceramic coated polyimide film with a thickness of 12-50 μm.

3. The process for producing the tamper resistant low voltage multi-layer cable according to claim 1, characterized by, The drain wire is specifically a soft annealed tinned copper wire with a diameter of 0.3-0.5 mm.

4. The process for producing the tamper resistant low voltage multi-layer cable according to claim 1, characterized by, The size of the granulated pellets is 3 mmX3 mm or 4 mmX4 mm.

5. An interference-resistant low-voltage multi-layer cable, characterized by It is prepared by the preparation process of the anti-interference low-voltage multi-layer cable according to any one of claims 1-4.

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