Cross-linked polyolefin material for sea surface photovoltaic cable and preparation equipment of cross-linked polyolefin material

Abstract

The invention relates to the technical field of cable materials, and particularly discloses a cross-linked polyolefin material for a sea surface photovoltaic cable and preparation equipment of the cross-linked polyolefin material. The composite material comprises the following components in parts by weight: 78 to 88 parts of high-density polyethylene, 1.5 to 3 parts of dimethyl dibenzoyl peroxide, 0.3 to 0.7 part of an antioxidant, 0.4 to 0.8 part of an ultraviolet light absorber, 0.1 to 0.3 part of calcium stearate, 2 parts of a flame retardant, 0.6 part of a silane coupling agent, 0.5 to 1 part of an inorganic filler, 0.1 to 0.5 part of an auxiliary flame retardant, 0.3 to 0.7 part of copper salt, 0.8 to 1.2 parts of nano silicon dioxide and 0.5 to 2 parts of an ammonium persulfate solution. High-density polyethylene is adopted as a base material, higher density is achieved, the material is suitable for the sea surface high-humidity environment, linear low-density polyethylene and nano silicon dioxide remarkably improve the abrasion resistance of the material, and physical abrasion such as sand wind on the sea surface is effectively resisted.

Description

Technical Field

[0001] The invention relates to the technical field of cable materials, and in particular to a cross-linked polyolefin material for sea surface photovoltaic cables and a preparation device thereof. Background Art

[0002] Cross-linked polyolefin material for offshore photovoltaic cables is a polymer material specially designed for offshore photovoltaic system cables. It is based on cross-linked polyolefin and has a series of properties that adapt to the special environment of the sea surface by adding a variety of specific ingredients.

[0003] The invention with application number CN202411082432.1 provides a green, environmentally friendly, heat-resistant photovoltaic cable, including a twisted soft conductor, a red heat-resistant insulation layer, a black heat-resistant insulation layer and an anti-corrosion protective sheath; the twisted soft conductor is made of annealed soft fine copper wire by twisting; the red heat-resistant insulation layer and the black heat-resistant insulation layer are cross-linked polyolefin insulation materials; the anti-corrosion protective sheath is an irradiable cross-linked polyolefin anti-corrosion protective sheath material. The thickness of the red heat-resistant insulation layer is 1-1.15 times the diameter of the twisted soft conductor; the thickness of the black heat-resistant insulation layer is 4-5 times the diameter of the twisted soft conductor; the photovoltaic cable has good flame retardant, heat-resistant, aging-resistant and other properties.

[0004] However, this patent is difficult to cope with the environmental conditions of high humidity, high ultraviolet rays, high corrosion and multiple microorganisms on the sea surface.

[0005] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. Summary of the invention

[0006] The object of the present invention is to provide a cross-linked polyolefin material for sea surface photovoltaic cables and a preparation device thereof which can effectively solve the above-mentioned technical problems.

[0007] To achieve the purpose of the present invention, according to one aspect of the present invention, the following technical solution is adopted:

[0008] A cross-linked polyolefin material for sea surface photovoltaic cables comprises the following components in parts by weight: 78 to 88 parts of high-density polyethylene, 1.5 to 3 parts of dimethyl dibenzoyl peroxide, 0.3 to 0.7 parts of antioxidant, 0.4 to 0.8 parts of ultraviolet absorber, 0.1 to 0.3 parts of calcium stearate, 2 parts of flame retardant, 0.6 parts of silane coupling agent, 0.5 to 1 parts of inorganic filler, 0.1 to 0.5 parts of secondary flame retardant, 0.3 to 0.7 parts of copper salt, 0.8 to 1.2 parts of nano silicon dioxide, and 0.5-2 parts of ammonium persulfate solution.

[0009] Furthermore, the method further comprises the following preparation steps:

[0010] S1, putting the high-density polyethylene into a vacuum drying oven, setting the temperature between 80 and 100 degrees Celsius, and drying for 2 to 4 hours; placing the inorganic filler and the silane coupling agent in a high-speed stirrer and stirring them thoroughly, so that the silane coupling agent evenly covers the inorganic filler;

[0011] S2, placing the pretreated high-density polyethylene into a mixing device, and then adding the dimethyl dibenzoyl peroxide; controlling the mixing temperature at 150 to 180 degrees Celsius, setting the speed at 30 to 50 revolutions per minute, and mixing time at 10 to 20 minutes;

[0012] S3, transferring the mixed material to a pressing device, and pressing it under a specific pressure to obtain a sheet;

[0013] S4, placing the sheet in a water bath, controlling the water bath temperature at 90 to 95 degrees Celsius, and crosslinking for 2 to 3 hours; during the crosslinking process, using a temperature sensor to monitor the temperature in real time, and ensuring that the temperature fluctuation range is controlled within plus or minus 1 degree Celsius; at the same time, using a stirring device to keep the water in the water bath flowing so that the sheet is heated evenly;

[0014] S5. After cross-linking, the appearance of the sheet is inspected, and the cross-linking condition is analyzed by infrared spectroscopy.

[0015] Further, S6, after uniformly mixing methyl acrylate liquid, butyl acrylate liquid, vinyl acetate liquid, acrylic acid liquid, a half-solid or solid component, and a two-solid component, stirring to form a pre-emulsion;

[0016] S7, adding one third of the pre-emulsion, controlling the temperature at 70 to 80 degrees Celsius, adding the ammonium persulfate solution, stirring continuously and observing until the solution exhibits blue light; then raising the temperature to 80 to 85 degrees Celsius, adding the remaining pre-emulsion and the ammonium persulfate solution, and keeping the temperature for reaction for 1 to 3 hours; after the reaction is completed, using an acid-base regulator to adjust the pH value to 6 to 8, separating the solid by suction filtration, and then drying to obtain modified aluminum hydroxide;

[0017] S8, putting the modified aluminum hydroxide, silane cross-linked polyethylene, the flame retardant, and the secondary flame retardant into a mixing device, setting the temperature at 160 to 190 degrees Celsius, the speed at 40 to 60 revolutions per minute, and mixing for 15 to 25 minutes;

[0018] S9, pre-mix the antioxidant, the ultraviolet absorber, and the calcium stearate respectively; add the inorganic filler, the copper salt, and the nano-silicon dioxide into the reaction kettle, adjust the temperature to 155 to 185 degrees Celsius, change the speed to 35 to 55 revolutions per minute, and mix for 10 to 15 minutes;

[0019] S10, transferring the mixed material to a pressing device, and pressing to obtain an insulating heat-resistant cross-linked polyolefin sheet;

[0020] S11. Place the sheet into a water bath, control the temperature at 100 to 105 degrees Celsius, and crosslink for 3 to 4 hours; during the crosslinking process, ensure that the temperature is stable and keep the water flowing; after the crosslinking is completed, allow the material to cool naturally in the water bath to 50 to 60 degrees Celsius before taking it out.

[0021] In order to achieve the above object, according to another aspect of the present invention, a device for preparing a cross-linked polyolefin material for a sea surface photovoltaic cable is provided, the device comprising: a pre-mixing component arranged on the top of the reactor;

[0022] The premixing assembly includes: a premixing chamber, a mounting chamber, and a first motor which are arranged in sequence from bottom to top; a supporting leg is arranged at the bottom of the premixing chamber, and the supporting leg is connected to the reactor; a mounting plate is arranged between the premixing chamber and the mounting chamber, a material discharge box is arranged on the mounting plate, and a stirring member is connected to the material discharge box, and the stirring member is driven by the first motor.

[0023] Furthermore, it also includes: a driving component that transmits power from the first motor; the driving component includes: a driving gear fixedly connected to the output end of the first motor, a first driven gear and a second driven gear meshing with the driving gear; the first driven gear and the second driven gear are respectively connected to the agitator.

[0024] Furthermore, the output end of the first motor is also connected to a telescopic rod, the telescopic end of the telescopic rod is connected to the driving gear, and a transmission block is installed on the telescopic rod, and the transmission block is connected to a telescopic cylinder; the first driven gear and the second driven gear are staggered; when the telescopic cylinder drives the driving gear to rise, the driving gear meshes with one of the second driven gears and meshes with the first driven gear at the same time, and stirs the antioxidant and the ultraviolet absorber respectively; when the telescopic cylinder drives the driving gear to descend, the driving gear meshes with the other second driven gear and meshes with the first driven gear at the same time, and stirs the antioxidant and the calcium stearate respectively.

[0025] Furthermore, a second motor is installed in the middle of the mounting plate, and a fan blade is connected to the output end of the second motor; an air flow channel is arranged in the premixing chamber, the air inlet end of the air flow channel is connected to the discharge box and the fan blade, and the air outlet end of the air flow channel is connected to a discharge hose, and the air outlet end of the discharge hose is connected to the reactor.

[0026] Furthermore, it also includes: a knocking and swinging component that drives the discharge hose to swing and knock the premixing chamber;

[0027] The knocking and swinging assembly includes: a pipe sleeve connected to the discharge hose, a push rod connected to the pipe sleeve, a slider fixedly connected to the push rod, a limit rod slidably connected to the slider, and a turntable, wherein the turntable is driven by a third motor and is slidably connected to the slider and the turntable with a first swing rod, one end of the first swing rod is rotatably mounted on a connecting seat, and the connecting seat is mounted on the top of the reactor; the push rod is also hinged with a second swing rod, the second swing rod is hinged with a third swing rod, the third swing rod is slidably connected with a guide block, and the guide block is mounted at the bottom of the premixing chamber.

[0028] Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts high-density polyethylene as a substrate, has a higher density, and is suitable for the high-humidity environment of the sea surface; the linear low-density polyethylene and the nano-silicon dioxide of the present invention significantly improve the wear resistance of the material and effectively resist physical wear such as wind and sand on the sea surface; the flame retardant and auxiliary flame retardant of the present invention, as well as copper salt, prevent the attachment of microorganisms, improve the comprehensive flame retardancy and biological preservatives of the material; antioxidants and ultraviolet absorbers can reduce the aging rate and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0030] Figure 1 This is a schematic structural diagram of a device for preparing a cross-linked polyolefin material for a sea photovoltaic cable according to the present invention;

[0031] Figure 2 It is a schematic diagram of a device for preparing a cross-linked polyolefin material for a sea photovoltaic cable according to the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the premixing assembly of the present invention;

[0033] Figure 4 for Figure 3 A partial enlarged view of part A;

[0034] Figure 5 It is a structural schematic diagram of the knocking and swinging assembly of the present invention;

[0035] Figure 6 It is a schematic diagram of the structure of the driving assembly of the present invention;

[0036] Figure 7 is a schematic diagram of a second motor of the present invention;

[0037] Figure 8 Schematic diagram of the internal structure of the premixing assembly of the present invention.

[0038] In the figure: 1, reactor; 2, premixing assembly; 21, premixing chamber; 22, mounting chamber; 23, first motor; 221, mounting plate; 222, second motor; 223, fan blade; 224, stirring member; 225, unloading box; 226, driving assembly; 227, transmission block; 228, telescopic cylinder; 2261, driving gear; 2262, driven gear; 211, housing; 213, discharge hose; 214, knocking swing assembly; 2141, pipe sleeve; 2142, push rod; 2143, slider; 2144, limit rod; 2145, turntable; 2146, first swing rod; 2147, third motor; 2148, second swing rod; 2149, third swing rod; 2150, guide block; 2151, motor mounting seat; 2152, connecting seat. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments.

[0040] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. When a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0041] like Figures 1 to 8As shown, the present invention provides a cross-linked polyolefin material for sea surface photovoltaic cables, comprising the following components in parts by weight: 78 to 88 parts of high-density polyethylene, 1.5 to 3 parts of dimethyl benzoyl peroxide, 0.3 to 0.7 parts of antioxidant, 0.4 to 0.8 parts of ultraviolet absorber, 0.1 to 0.3 parts of calcium stearate, 2 parts of flame retardant, 0.6 parts of silane coupling agent, 0.5 to 1 parts of inorganic filler, 0.1 to 0.5 parts of secondary flame retardant, 0.3 to 0.7 parts of copper salt, 0.8 to 1.2 parts of nano silicon dioxide, and 0.5-2 parts of ammonium persulfate solution.

[0042] The following preparation steps are also included:

[0043] S1. Put high-density polyethylene into a vacuum drying oven, set the temperature between 80 and 100 degrees Celsius, and dry for 2 to 4 hours; put the inorganic filler and the silane coupling agent in a high-speed mixer and stir them thoroughly, so that the silane coupling agent evenly covers the inorganic filler; the interface bonding force between the inorganic filler and the polymer matrix is ​​enhanced, which helps to improve the overall mechanical properties of the material;

[0044] S2, placing the pretreated high-density polyethylene into a mixing device, and then adding dimethyl dibenzoyl peroxide; controlling the mixing temperature at 150 to 180 degrees Celsius, setting the speed at 30 to 50 revolutions per minute, and mixing time at 10 to 20 minutes, so that the crosslinking agent can be evenly dispersed in the polyethylene matrix to initiate a crosslinking reaction;

[0045] S3, transferring the mixed material to a pressing device, and pressing it under a specific pressure to obtain a sheet;

[0046] S4. Place the sheet in a water bath, control the water bath temperature at 90 to 95 degrees Celsius, and crosslink for 2 to 3 hours. During the crosslinking process, use a temperature sensor to monitor the temperature in real time, and ensure that the temperature fluctuation range is controlled within plus or minus 1 degree Celsius. At the same time, use a stirring device to keep the water in the water bath flowing so that the sheet is heated evenly. This helps to form a uniform and stable crosslinked structure and improve the consistency of material performance.

[0047] S5. Check the appearance of the sheet after cross-linking, and use infrared spectroscopy to analyze the cross-linking situation. Check the appearance of the sheet after cross-linking to intuitively find defects such as whether the surface is flat, whether there are cracks, etc., and timely find possible problems in the preparation process;

[0048] S6, mixing methyl acrylate liquid, butyl acrylate liquid, vinyl acetate liquid, acrylic acid liquid, half of the solid or solid components, and two of the solid components uniformly, and stirring to form a pre-emulsion;

[0049] S7, add one third of the pre-emulsion, control the temperature at 70 to 80 degrees Celsius, add ammonium persulfate solution, continue stirring and observe until the solution shows blue light; then increase the temperature to 80 to 85 degrees Celsius, add the remaining pre-emulsion and ammonium persulfate solution, and keep the temperature for 1 to 3 hours; after the reaction is completed, use an acid-base regulator to adjust the pH value to 6 to 8, separate the solid by suction filtration, and then dry it to obtain modified aluminum hydroxide;

[0050] S8. Place modified aluminum hydroxide, silane cross-linked polyethylene, flame retardant, and secondary flame retardant into a mixing device, set the temperature to 160 to 190 degrees Celsius, the speed to 40 to 60 revolutions per minute, and mix for 15 to 25 minutes to fully mix the components and work together, which is helpful to further improve the flame retardant properties, mechanical properties, and stability of the material in complex environments;

[0051] S9, respectively pre-mixing antioxidant, ultraviolet absorber, and calcium stearate; adding inorganic filler, copper salt, and nano-silicon dioxide to the reaction kettle 1, adjusting the temperature to 155 to 185 degrees Celsius, the speed to 35 to 55 revolutions per minute, and mixing for 10 to 15 minutes; respectively pre-mixing antioxidant, ultraviolet absorber, and calcium stearate is conducive to more uniform dispersion of these additives in the material system during the subsequent mixing process, and giving full play to their antioxidant, ultraviolet absorption, lubrication and stabilization effects;

[0052] S10, transferring the mixed material to a pressing device, and pressing to obtain an insulating heat-resistant cross-linked polyolefin sheet;

[0053] S11. Place the sheet in a water bath, control the temperature at 100 to 105 degrees Celsius, and cross-link for 3 to 4 hours. During the cross-linking process, ensure that the temperature is stable and keep the water flowing. After the cross-linking is completed, allow the material to cool naturally to 50 to 60 degrees Celsius in the water bath, and then take it out to fully release the internal stress of the material, avoid internal stress caused by rapid cooling, which may cause deformation, cracking and other problems in the material, and ensure the dimensional stability and physical properties of the material.

[0054] The present invention adopts high-density polyethylene as a substrate, which has a higher density and is suitable for the high-humidity environment of the sea surface. The linear low-density polyethylene and the nano-silicon dioxide of the present invention significantly improve the wear resistance of the material and effectively resist physical wear such as wind and sand on the sea surface. The flame retardant and auxiliary flame retardant of the present invention, as well as copper salt, are used to prevent microbial attachment, improve the comprehensive flame retardancy and biopreservativeness of the material, and the antioxidant and ultraviolet absorber effectively resist ultraviolet rays and oxidation, can reduce the aging rate, and extend the service life; nano-silicon dioxide is added in the present application, which significantly improves the wear resistance of the material and effectively resists physical wear such as wind and sand on the sea surface; silane coupling agent and inorganic filler are added in the present application, which enhance the mechanical strength and heat resistance of the material and improve the compatibility with the polymer matrix; calcium stearate is added in the present application, which improves processability, reduces equipment wear, and is suitable for large-scale production.

[0055] Based on the same technical concept, an embodiment of the present invention also provides a device for preparing cross-linked polyolefin materials for sea surface photovoltaic cables, including: a reactor 1, a top of the reactor 1 is provided with multiple feed ports, one of which is connected to a premixing component 2.

[0056] The premixing assembly 2 includes: a premixing chamber 21, an installation chamber 22, and a first motor 23 arranged in sequence from bottom to top; the first motor 23 is used to drive a driving assembly 226 arranged inside the installation chamber 22; a supporting leg is arranged at the bottom of the premixing chamber 21, and is connected to the top of the reactor 1 through the supporting leg.

[0057] A feed port is provided at the top of the installation chamber 22 for feeding materials into the lower material box 225 through the feed port; a mounting plate 221 is provided between the installation chamber 22 and the premixing chamber 21, a vent is provided in the middle of the installation plate 221, and a mounting port is provided along the circumference of one side of the vent, and a material box 225 is installed in the mounting port, and different additives are stored in each material box 225. In this embodiment, the preparations are antioxidants, the ultraviolet absorbers, and the calcium stearate; the material box 225 is coaxially connected to the stirring member 22 4. The stirring member 224 is used to stir the preparation in the discharge box 225; the stirring member 224 consists of a cover body, a connecting shaft installed on the top of the cover body, a stirring rod and an auger installed on the bottom of the cover body; the auger is located in the middle of the cover body, and the stirring rod is located on the outside of the auger; the vertical position of the stirring rod is in the middle of the discharge box 225, and the longitudinal position of the auger is at the bottom of the discharge box 225. When the cover body rotates, on the one hand, it drives the auger to discharge quantitatively, and on the other hand, it drives the stirring rod to stir the preparation before entering the auger.

[0058] The driving assembly 226 includes: a driving gear 2261 fixedly connected to the output end of the first motor 23, a first driven gear 2262 and a second driven gear 2262 meshingly connected to the driving gear 2261; the driven gear 2262 is coaxially connected to the connecting shaft of the agitator 224, and is used to drive the driven gear 2262 to rotate through the driving gear 2261, thereby driving the agitator 224 to rotate, thereby stirring the preparation in the discharge box 225, preventing the preparation from agglomerating, and also facilitating accurate discharge; bearings are connected to the tops of the first driven gear 2262 and the second driven gear 2262, and the bearings are installed in the mounting plate.

[0059] Preferably, the output end of the first motor 23 is also connected to a telescopic rod, the telescopic end of the telescopic rod is fixedly connected to the driving gear 2261, and a transmission block 227 is installed on the telescopic rod, and the transmission block 227 is connected to a telescopic cylinder 228. The transmission block 227 is driven to rise and fall by the telescopic cylinder 228, thereby driving the driving gear 2261 to rise and fall; the telescopic cylinder 228 is installed inside the installation chamber 22, and its piston rod is connected to the transmission block 227.

[0060] There is one first driven gear 2262 and two second driven gears 2262 . The two second driven gears 2262 have the same height. The height of the first driven gear 2262 is twice that of the second driven gear 2262 . The two second driven gears 2262 are staggered in the height direction, and the height of the driving gear 2261 is the same as that of the second driven gear 2262 .

[0061] When the telescopic cylinder 228 drives the driving gear 2261 to rise, the driving gear 2261 meshes with one of the second driven gears 2262 and the first driven gear 2262 at the same time, so that the antioxidant and the ultraviolet absorber can be stirred respectively; when the telescopic cylinder 228 drives the driving gear 2261 to descend, the driving gear 2261 meshes with the other second driven gear 2262 and the first driven gear 2262 at the same time, so that the antioxidant and calcium stearate can be stirred respectively; thereby, the antioxidant, the ultraviolet absorber and the calcium stearate are mixed respectively; wherein, the gear ratio of the second driven gear 2262, the first driven gear 2262 and the driving gear 2261 can be adjusted as needed.

[0062] A second motor 222 is installed in the air vent, and a fan blade 223 is connected to the output end of the second motor 222. The second motor 222 is a brushless motor. The second motor 222 is used to drive the fan blade 223 to rotate at a high speed and blow air into the shell 211, so that the preparation discharged from the discharge box 225 into the shell 211 can be mixed; the air outlet end of the fan blade 223 is connected to an air flow channel, and the air flow channel is annular. The air inlet end of the air flow channel is connected to the air outlet end of the fan blade 223, and the air outlet end of the air flow channel is connected to the discharge hose 213; the preparation rotates at a high speed and mixes in the air flow channel, and after mixing, enters the discharge hose 213 from the outlet of the air flow channel, and finally sprays from the discharge hose 213 into the reactor 1, and enters the reactor 1 in a jetting manner. After the material is sprayed out from the discharge hose 213, it will form a larger dispersion range in the space of the reactor 1. The high-speed spraying disperses the material in the form of fine particles, increases the contact area between the materials, and further improves the mixing uniformity.

[0063] A knocking and swinging assembly 214 is also provided on one side of the premixing assembly 2; the knocking and swinging assembly 214 includes: a pipe sleeve 2141 connected to the discharge hose 213, a push rod 2142 connected to the pipe sleeve 2141, a slider 2143 fixedly connected to the push rod 2142, a limit rod 2144 slidably connected to the slider 2143, a first cylindrical block is provided on the slider 2143, a turntable 2145 is slidably connected to the first cylindrical block, the turntable 2145 is driven by a third motor 2147, a second cylindrical block is provided on the turntable 2145, the second cylindrical block is slidably connected to the first swing rod 2146, and the first swing rod 2146 is One end is rotatably mounted on a connecting seat 2152, and the connecting seat 2152 is mounted on the top of the reactor 1; the output end of the turntable 2145 is connected to the third motor 2147, and the third motor 2147 is mounted on a motor mounting seat 2151, and the motor mounting seat 2151 is mounted on the top of the reactor 1; the push rod 2142 is also hinged with a second swing rod 2148, and the second swing rod 2148 is hinged with a third swing rod 2149, and the third swing rod 2149 is slidably connected with a guide block 2150, which is mounted on the side wall at the bottom of the premixing chamber 21, and the guide block 2150 is used to limit the movement of the third swing rod 2149.

[0064] When the third motor 2147 rotates, it drives the turntable 2145 to rotate, thereby driving the connecting block to slide back and forth along the limiting rod 2144; during the reciprocating sliding of the connecting block, the discharge hose 213 is driven to swing through the pipe sleeve 2141, thereby expanding the spray range of the discharge hose 213 and making the preparation more evenly dispersed in the reactor 1. The third swing rod 2149 slides along the guide block 2150 and knocks the outer shell 211, thereby reducing the possibility of the preparation adhering to the air flow channel inside the outer shell 211, thereby avoiding the problems of uneven discharge and inaccurate discharge amount.

[0065] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0066] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A cross-linked polyolefin material for sea photovoltaic cables, characterized in that: The invention comprises the following components in parts by weight: 78 to 88 parts of high-density polyethylene, 1.5 to 3 parts of dimethyl dibenzoyl peroxide, 0.3 to 0.7 parts of antioxidant, 0.4 to 0.8 parts of ultraviolet absorber, 0.1 to 0.3 parts of calcium stearate, 2 parts of flame retardant, 0.6 parts of silane coupling agent, 0.5 to 1 parts of inorganic filler, 0.1 to 0.5 parts of secondary flame retardant, 0.3 to 0.7 parts of copper salt, 0.8 to 1.2 parts of nano silicon dioxide and 0.5-2 parts of ammonium persulfate solution.

2. The cross-linked polyolefin material for sea photovoltaic cables according to claim 1, characterized in that: The following preparation steps are also included: S1, putting the high-density polyethylene into a vacuum drying oven, setting the temperature between 80 and 100 degrees Celsius, and drying for 2 to 4 hours; placing the inorganic filler and the silane coupling agent in a high-speed stirrer and stirring them thoroughly, so that the silane coupling agent evenly covers the inorganic filler; S2, placing the pretreated high-density polyethylene into a mixing device, and then adding the dimethyl dibenzoyl peroxide; controlling the mixing temperature at 150 to 180 degrees Celsius, setting the speed at 30 to 50 revolutions per minute, and mixing time at 10 to 20 minutes; S3, transferring the mixed material to a pressing device, and pressing it under a specific pressure to obtain a sheet; S4, placing the sheet into a water bath, controlling the water bath temperature at 90 to 95 degrees Celsius, and cross-linking for 2 to 3 hours; During the cross-linking process, a temperature sensor is used to monitor the temperature in real time to ensure that the temperature fluctuation range is controlled within plus or minus 1 degree Celsius; at the same time, a stirring device is used to keep the water in the water bath flowing so that the sheet is heated evenly; S5. After cross-linking, the appearance of the sheet is inspected, and the cross-linking condition is analyzed by infrared spectroscopy.

3. The cross-linked polyolefin material for sea photovoltaic cables according to claim 2, characterized in that: S6, mixing methyl acrylate liquid, butyl acrylate liquid, vinyl acetate liquid, acrylic acid liquid, half of the solid or solid components, and two of the solid components uniformly, and stirring to form a pre-emulsion; S7, adding one third of the pre-emulsion, controlling the temperature at 70 to 80 degrees Celsius, adding the ammonium persulfate solution, stirring continuously and observing until the solution exhibits blue light; then raising the temperature to 80 to 85 degrees Celsius, adding the remaining pre-emulsion and the ammonium persulfate solution, and keeping the temperature for reaction for 1 to 3 hours; after the reaction is completed, using an acid-base regulator to adjust the pH value to 6 to 8, separating the solid by suction filtration, and then drying to obtain modified aluminum hydroxide; S8, putting the modified aluminum hydroxide, silane cross-linked polyethylene, the flame retardant, and the secondary flame retardant into a mixing device, setting the temperature at 160 to 190 degrees Celsius, the speed at 40 to 60 revolutions per minute, and mixing for 15 to 25 minutes; S9, pre-mix the antioxidant, the ultraviolet absorber, and the calcium stearate respectively; add the inorganic filler, the copper salt, and the nano-silicon dioxide into the reaction kettle, adjust the temperature to 155 to 185 degrees Celsius, change the speed to 35 to 55 revolutions per minute, and mix for 10 to 15 minutes; S10, transferring the mixed material to a pressing device, and pressing to obtain an insulating heat-resistant cross-linked polyolefin sheet; S11, placing the sheet into a water bath, controlling the temperature at 100 to 105 degrees Celsius, and cross-linking for 3 to 4 hours; During the cross-linking process, ensure that the temperature is stable and keep the water flowing; after cross-linking, let the material cool naturally in a water bath to 50 to 60 degrees Celsius before taking it out.

4. A device for preparing a cross-linked polyolefin material for a sea surface photovoltaic cable, used for preparing the cross-linked polyolefin material for a sea surface photovoltaic cable according to claim 3, characterized in that: include: A premixing assembly disposed on the top of the reactor; The premixing assembly includes: a premixing chamber, a mounting chamber, and a first motor which are arranged in sequence from bottom to top; a supporting leg is arranged at the bottom of the premixing chamber, and the supporting leg is connected to the reactor; a mounting plate is arranged between the premixing chamber and the mounting chamber, a material discharge box is arranged on the mounting plate, and a stirring member is connected to the material discharge box, and the stirring member is driven by the first motor.

5. The equipment for preparing cross-linked polyolefin material for sea photovoltaic cables according to claim 4, characterized in that: Also includes: a drive assembly for transmitting power from the first motor; The driving assembly comprises: a driving gear fixedly connected to the output end of the first motor, a first driven gear and a second driven gear meshingly connected to the driving gear; The first driven gear and the second driven gear are connected to the stirring member respectively.

6. The equipment for preparing cross-linked polyolefin material for sea photovoltaic cables according to claim 5, characterized in that: The output end of the first motor is also connected to a telescopic rod, the telescopic end of the telescopic rod is connected to the driving gear, and a transmission block is installed on the telescopic rod, and the transmission block is connected to a telescopic cylinder; the first driven gear and the second driven gear are staggered; when the telescopic cylinder drives the driving gear to rise, the driving gear meshes with one of the second driven gears and the first driven gear at the same time, and the antioxidant and the ultraviolet absorber are stirred respectively; when the telescopic cylinder drives the driving gear to descend, the driving gear meshes with the other second driven gear and the first driven gear at the same time, and the antioxidant and the calcium stearate are stirred respectively.

7. The equipment for preparing cross-linked polyolefin material for sea photovoltaic cables according to claim 6, characterized in that: A second motor is installed in the middle of the mounting plate, and a fan blade is connected to the output end of the second motor; an air flow channel is arranged in the premixing chamber, an air inlet end of the air flow channel is connected to the discharge box and the fan blade, and an air outlet end of the air flow channel is connected to a discharge hose, and an air outlet end of the discharge hose is connected to the reactor.

8. The equipment for preparing cross-linked polyolefin material for sea photovoltaic cables according to claim 7, characterized in that: Also includes: The knocking and swinging assembly drives the discharge hose to swing and knock the premixing chamber; The knocking and swinging assembly includes: a pipe sleeve connected to the discharge hose, a push rod connected to the pipe sleeve, a slider fixedly connected to the push rod, a limit rod slidably connected to the slider, and a turntable, wherein the turntable is driven by a third motor and is slidably connected to the slider and the turntable with a first swing rod, one end of the first swing rod is rotatably mounted on a connecting seat, and the connecting seat is mounted on the top of the reactor; the push rod is also hinged with a second swing rod, the second swing rod is hinged with a third swing rod, the third swing rod is slidably connected with a guide block, and the guide block is mounted at the bottom of the premixing chamber.

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