Insulating material and preparation method thereof, and 66kv distortion-resistant flexible cable for offshore wind power

Abstract

The application discloses an insulating material, which comprises the following components in parts by weight: ethylene-propylene rubber 100 parts; a vulcanization system 1-5 parts; a reinforcing system 40-60 parts; a protection system 1-5 parts; a plasticizing system 4-10 parts; an activating system 2-10 parts; and a coupling agent 0.5-2.5 parts. The application further discloses a preparation method of the insulating material, and a 66kV offshore wind power cable with an insulating layer made of the insulating material. The insulating material has a very low partial discharge value, excellent voltage breakdown resistance test performance, and good thermal stability, and can fully meet the requirements of the insulating material for a 66kV torsion-resistant soft cable for offshore wind power.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of insulation, and particularly relates to an insulation material, a preparation method thereof and a 66kV distortion-resistant soft cable for offshore wind power. BACKGROUND

[0002] Wind power is a renewable clean energy with great resource potential and relatively mature technology, and has been paid more and more attention by countries in the world under the new situation of reducing greenhouse gas emissions and responding to climate change, and has been developed and utilized on a large scale in the world. Under the guidance of the "double carbon" target, the wind power industry has ushered in a rare development opportunity.

[0003] In recent years, with the shift of the development focus of the wind power industry from "onshore wind turbines" to "offshore wind turbines", and considering the comprehensive cost and benefit, major wind power industry enterprises have gradually abandoned the original 35kV voltage level solution, and the 66kV voltage level solution for wind turbines has been sought after, and many wind farm projects that are being planned or have been awarded will adopt the 66kV voltage level solution.

[0004] However, the cable for offshore wind power has the characteristics of complex operating environment, high voltage level and frequent twisting, and the voltage resistance, twisting resistance and thermal stability of the traditional insulation material cannot meet the actual application requirements, which greatly limits the implementation of the 66kV voltage level solution. SUMMARY

[0005] The technical problem to be solved by the present application is to provide an insulation material, a preparation method thereof and a 66kV distortion-resistant soft cable for offshore wind power, which has extremely low partial discharge value, excellent voltage breakdown test performance and good thermal stability, and can fully meet the requirements of the 66kV distortion-resistant soft cable for offshore wind power on the insulation material.

[0006] The technical solution of the present application to solve the above technical problem is:

[0007] According to one aspect of the present application, an insulation material is provided, and the technical solution is as follows:

[0008] An insulation material comprises the following components by weight:

[0009] 100 parts of ethylene-propylene rubber;

[0010] 1-5 parts of a vulcanization system;

[0011] 40-60 parts of a reinforcing system;

[0012] 1-5 parts of a protection system;

[0013] 4-10 parts of a plasticizing system;

[0014] Activating system 2-10 parts;

[0015] Coupling agent 0.5-2.5 parts.

[0016] Preferably, the ethylene-propylene rubber is a terpolymer ethylene-propylene rubber, which comprises 2.5%-4% of a third monomer, 65%-75% of ethylene, and the rest of propylene, and the Mooney viscosity of the terpolymer ethylene-propylene rubber is 25-40.

[0017] Preferably, the vulcanization system is a combination of triallyl isocyanurate and dicumyl peroxide, and the weight ratio of the triallyl isocyanurate to the dicumyl peroxide is (0.5-2.5):(0.5-2.5).

[0018] Preferably, the reinforcing system is active calcined clay, and the calcination temperature of the active calcined clay is 650-800℃.

[0019] Preferably, the protective system is a combination of 2-mercaptobenzimidazole, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and microcrystalline wax, and the weight ratio of the 2-mercaptobenzimidazole, the 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and the microcrystalline wax is (0.25-1):(0.25-1.5):(0.5-2.5).

[0020] Preferably, the plasticizing system is liquid paraffin.

[0021] Preferably, the activating system is one or both of zinc oxide and lead oxide, and when both, the weight ratio of the zinc oxide to the lead oxide is (1.5-3):(0.5-7).

[0022] Preferably, the coupling agent is one or both of vinyl-tris(2-methoxyethoxy)silane and bis-[gamma-(triethoxysilo)propyl]tetrasulfide, and when both, the weight ratio of the vinyl-tris(2-methoxyethoxy)silane to the bis-[gamma-(triethoxysilo)propyl]tetrasulfide is (0.3-1):(0.2-1.5).

[0023] According to another aspect of the present application, a method for preparing an insulating material is provided, and the technical solution is as follows:

[0024] A method for preparing an insulating material, comprising:

[0025] Batching: according to the insulating material described above, ethylene-propylene rubber, a vulcanization system, a reinforcing system, a protective system, a plasticizing system, an activating system, and a coupling agent are weighed;

[0026] Mixing: first, the ethylene-propylene rubber, the activation system, the chemical prevention system, and the plasticizing system are put into the mixing machine to mix, then the reinforcing system and the coupling agent are added to continue mixing, finally, the vulcanization system is added to mix, and the mixing rubber is obtained;

[0027] Filtering: the mixing rubber is extruded and filtered by a filter rubber machine to obtain a 60-160 mesh filtered mixing rubber;

[0028] Granulation: the filtered mixing rubber is extruded and granulated by a single screw reciprocating extruder to obtain rubber particles;

[0029] Drying: the rubber particles are dried by purified hot air, and the insulation material product is obtained after cooling.

[0030] Preferably, the temperature of the extrusion filtering is 100-130 DEG C; the temperature of the extrusion granulation is 120-135 DEG C.

[0031] According to another aspect of the present application, a 66kV distortion-resistant soft cable for offshore wind power is provided, and the technical scheme is as follows:

[0032] A 66kV cable for offshore wind power, comprising an insulation layer, and the insulation layer is made of the insulation material described above.

[0033] Advantages:

[0034] The partial discharge value of the insulation material is extremely low, which can be less than 1.5pc, the voltage breakdown test performance is excellent, the thermal stability is good, the average tensile strength before aging is more than 13.7N / mm2, the average elongation at break before aging is more than 360%, the tensile strength change rate after aging is less than 6.5%, and the elongation at break change rate after aging is less than 6%, which is much higher than the performance requirements of 66kV ethylene-propylene rubber material in the standard TICW22-2022 "66kV distortion-resistant soft cable for wind power", and can fully meet the requirements of the insulation material for 66kV distortion-resistant soft cable for offshore wind power. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The formula table of the insulation material in the embodiment of the present application;

[0036] Figure 2 The flowchart of the preparation method of the insulation material in the embodiment of the present application. DETAILED DESCRIPTION

[0037] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions 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, 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 protection scope of the present invention.

[0038] Example 1

[0039] like Figure 1 As shown, this embodiment discloses an insulating material comprising the following components in parts by weight:

[0040] 100 parts of ethylene propylene rubber;

[0041] 1-5 parts of vulcanization system;

[0042] 40-60 parts of the reinforcement system;

[0043] 1-5 copies of the protective system;

[0044] 4-10 parts of plasticizer system;

[0045] Activation system: 2-10 parts;

[0046] 0.5 to 2.5 parts of coupling agent.

[0047] In this embodiment, the ethylene propylene rubber is a ternary ethylene propylene rubber. By weight, the ternary ethylene propylene rubber includes 2.5% to 4% of a third monomer, 65% to 75% of ethylene, and the remainder is propylene. The third monomer is a non-conjugated diene, such as ethyleneide norbornene (ENB), dicyclopentadiene (DCPD), or 1,4-hexadiene (HD). Furthermore, the Mooney viscosity ML 1+4 of the ethylene propylene rubber is 25 to 40 at 121°C.

[0048] In this embodiment, the vulcanization system uses a composition of triallyl isocyanurate (TAIC) and dicumyl peroxide (DCP), wherein the weight ratio of triallyl isocyanurate (TAIC) to dicumyl peroxide (DCP) is (0.5-2.5):(0.5-2.5). DCP is a rubber vulcanizing agent, and TAIC is used as a co-vulcanizing agent. The use of both in a certain proportion can significantly shorten the vulcanization time, improve mechanical properties, abrasion resistance, weather resistance, solvent resistance, and thermal stability, and at the same time, reduce the odor produced by DCP vulcanization.

[0049] In this embodiment, the reinforcing system is active calcined clay, and the calcination temperature of the active calcined clay is 650-800°C. At this temperature, the hydroxyl water in the crystal structure of the calcined clay can be fully separated, the adsorption decreases, but the surface energy decreases, which improves the dispersibility of the clay, and the amorphous structure makes the structure loose, which also improves the dispersibility and increases the activity.

[0050] In this embodiment, the protective system uses a combination of 2-mercaptobenzimidazole (MB), 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD), and microcrystalline wax, wherein the weight ratio of 2-mercaptobenzimidazole, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and microcrystalline wax is (0.25-1):(0.25-1.5):(0.5-2.5). RD has excellent protective effect on aging caused by thermal oxidation, and also has strong inhibitory effect on catalytic oxidation of metals. MB is used as a copper inhibitor, which can weaken the effect of vulcanizing agent in rubber (i.e. ethylene-propylene rubber) on copper wire, significantly improve the phenomenon of black copper wire and sticky rubber during rubber vulcanization, and MB can also be used as a vulcanization retarder to delay vulcanization. By using MB, RD, and microcrystalline wax in a certain proportion, the synergistic effect of MB and RD can be achieved, and the effect is better than using MB or RD alone. Microcrystalline wax can slowly migrate to the surface of the vulcanized rubber after cooling, forming a dense and tough protective film that can isolate the invasion of oxygen and ozone in the air, thereby playing a physical anti-aging role.

[0051] In this embodiment, the plasticizing system uses liquid paraffin, which is a small molecular mineral oil with good wettability. When the small molecules of liquid paraffin enter the macromolecular chains of rubber compounds (i.e. ethylene-propylene rubber), they can increase the distance between the macromolecular chains, reduce the interaction force between the macromolecular chains, and make it easier for the macromolecular chains to slide relative to each other, resulting in better flowability of the rubber compounds. This can accelerate the dispersion of various additives (i.e. components other than ethylene-propylene rubber, such as vulcanization system, reinforcing system, etc.), shorten the mixing time of the components, and further soften the rubber polymer and prevent the rubber from becoming hard.

[0052] In this embodiment, the activation system uses one or both of zinc oxide and lead oxide (such as lead trioxide). When the activation system is a combination of zinc oxide and lead oxide, the weight ratio of zinc oxide to lead oxide is (1.5-3):(0.5-7). Zinc oxide and lead oxide can activate the vulcanization system, increase the cross-linking density of the vulcanized rubber, and improve the aging resistance of the rubber. This can further strengthen the vulcanization process and improve the tear resistance and wear resistance of the insulation material product.

[0053] In this embodiment, the coupling agent is one or both of vinyl-tris(2-methoxyethoxy)silane (A172) and bis-[gamma-(triethoxysil)propyl]tetrasulfide (Si69), preferably a combination of A172 and Si69, wherein the weight ratio of vinyl-tris(2-methoxyethoxy)silane (A172) to bis-[gamma-(triethoxysil)propyl]tetrasulfide (Si69) is (0.3-1):(0.2-1.5). A172, as a silane coupling agent, can be combined with active calcined clay to hydrophobize the surface of the active calcined clay, thereby improving the compatibility of the active calcined clay and the ethylene-propylene-diene rubber, and further improving the dispersibility and reducing the melt viscosity. In addition, it can also reduce the processing difficulty of the filled rubber compound. Si69 is a sulfur-containing silane coupling agent that can improve the crosslinking stability, tear resistance, shear resistance, water resistance, and other properties of the vulcanized rubber, and reduce the compression set, heat generation, and swelling in water, thereby improving the uniformity of the dispersion of the active calcined clay in the ethylene-propylene-diene rubber.

[0054] The partial discharge value of the insulation material of this embodiment is extremely low, which can reach below 1.5 pc, and the performance of the voltage breakdown resistance test is excellent, the thermal stability is good, the median value of the tensile strength before aging is more than 13.7 N / mm 2 , the median value of the elongation at break before aging is more than 360%, the change rate of the tensile strength after aging is less than 6.5%, and the change rate of the elongation at break after aging is less than 6%, which is much higher than the performance requirements of the 66kV ethylene-propylene-diene rubber material in the standard TICW22-2022 "66kV Torsion Resistant Flexible Cable for Wind Power Generation", and can fully meet the requirements of the 66kV torsion resistant flexible cable for offshore wind power on the insulation material.

[0055] Example 2

[0056] As Figure 2 shown, the present embodiment discloses a preparation method of an insulation material, comprising:

[0057] Batching: as shown in Table 1, 100 parts of ethylene-propylene-diene rubber (including non-conjugated diene 4%, ethylene 75%, and the rest being propylene, the Mooney viscosity of the ethylene-propylene-diene rubber (ML1+4, 121℃) is 40), 0.5 parts of triallyl isocyanurate (TAIC), 0.5 parts of dicumyl peroxide (DCP), 40 parts of active calcined clay, 0.25 parts of 2-mercaptobenzimidazole (MB), 0.25 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD), 0.5 parts of microcrystalline wax, 4 parts of liquid paraffin, 3 parts of zinc oxide, 6 parts of lead oxide, 0.3 parts of vinyl-tris(2-methoxyethoxy)silane (A172), and 0.2 parts of bis-[gamma-(triethoxysil)propyl]tetrasulfide (Si69) are weighed in parts by weight;

[0058] Table 1 Formulation table of Example 2

[0059]

[0060] Mixing: first, 100 parts of the ethylene-propylene-diene rubber is put into the internal mixer, then 0.25 parts of 2-mercaptobenzimidazole (MB), 0.25 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD), 0.5 parts of microcrystalline wax, 4 parts of liquid paraffin, 3 parts of zinc oxide, and 6 parts of lead oxide are added, and mixing is carried out for 1-2 min, so that the MB, RD, microcrystalline wax, liquid paraffin, zinc oxide, and lead oxide are uniformly dispersed in the ethylene-propylene-diene rubber, to obtain a first mixture with appropriate and uniform plasticity; then 40 parts of active calcined clay, 0.3 parts of vinyl-tris(2-methoxyethoxy)silane (A172), and 0.2 parts of bis-[γ-(triethoxysilo)propyl]tetrasulfide (Si69) are added, and mixing is continued for 3-4 min, so that the active calcined clay and the ethylene-propylene-diene rubber produce a certain aggregation on the phase interface to generate a bound rubber, to obtain a second mixture; finally, 0.5 parts of triallyl isocyanurate (TAIC) and 0.5 parts of dicumyl peroxide (DCP) are added, and mixing is carried out again for 1-2 min, to obtain a uniformly mixed rubber compound;

[0061] Filtering: the rubber compound is extruded and filtered at 100-130°C using a rubber filter with three layers of filter screens, wherein the mesh sizes of the three layers of filter screens are 160 mesh, 100 mesh, and 60 mesh in the order of passing of the rubber compound, to obtain a filtered rubber compound;

[0062] Pelletizing: the filtered rubber compound is extruded and pelletized at 120-135°C using a rubber extruder of single-screw reciprocating type, to obtain rubber pellets;

[0063] Drying: the rubber pellets are placed in a sealed pipeline and dried with purified hot air (containing no dust particles greater than 10 μm), and after cooling, the rubber pellets are placed for 6-12 h, so that the rubber pellet compound recovers fatigue, relaxes the mechanical stress during mixing, and allows the compounding agents to continue to diffuse during the placement process, to promote uniform dispersion, to obtain an insulation material product.

[0064] The above insulation material product is used together with other structural materials for producing cables to produce a 66 kV distortion-resistant soft cable for offshore wind power using a continuous steam low-temperature vulcanization production line, samples are taken from the cable and tested according to the standard TI CW22-2022, and the specific test items and test results are shown in Table 2.

[0065] Table 2 Test results of Example 2

[0066]

[0067] As shown in Table 2, the insulating material product prepared in this embodiment exhibits excellent withstand voltage breakdown performance, extremely low partial discharge value, large mechanical property margin before and after aging, good thermal stability, and excellent insulation performance when pressed out using a continuous steam low-temperature vulcanization production line to produce 66kV torsion-resistant flexible cables for offshore wind power.

[0068] Example 3

[0069] like Figure 2 As shown, this embodiment discloses a method for preparing an insulating material, including:

[0070] Ingredients: As shown in Table 3, by weight, weigh 100 parts of EPDM rubber (including 2.5% non-conjugated diene, 65% ethylene, and the remainder being propylene, with a Mooney viscosity of 30 for EPDM rubber (ML1+4, 121℃), 1 part of triallyl isocyanurate (TAIC), 2 parts of dicumyl peroxide (DCP), 50 parts of activated calcined clay, 1 part of 2-mercaptobenzimidazole (MB), 1.2 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD), 2.1 parts of microcrystalline wax, 8 parts of liquid paraffin, 2 parts of zinc oxide, 5 parts of lead oxide, 0.5 parts of vinyl-tris(2-methoxyethoxy)silane (A172), and 1 part of bis-[γ-(triethoxysilyl)propyl]tetrasulfide (Si69);

[0071] Table 3 Ingredients list for Example 3

[0072]

[0073] Mixing: First, put 100 parts of EPDM rubber into a mixer, then add 1 part of 2-mercaptobenzimidazole (MB), 1.2 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD), 2.1 parts of microcrystalline wax, 8 parts of liquid paraffin, 2 parts of zinc oxide, and 5 parts of lead oxide. Mix for 1-2 minutes to uniformly disperse MB, RD, microcrystalline wax, liquid paraffin, zinc oxide, and lead oxide into the EPDM rubber, obtaining a first mixture with appropriate plasticity and uniformity; then add 50 parts of activated calcined clay. 0.5 parts of vinyl-tris(2-methoxyethoxy)silane (A172) and 1 part of bis-[γ-(triethoxysilyl)propyl]tetrasulfide (Si69) were added and mixed for 3-4 minutes to allow the activated calcined clay and EPDM rubber to aggregate at the phase interface, forming a bonded rubber and obtaining a second mixture. Finally, 1 part of triallyl isocyanurate (TAIC) and 2 parts of dicumyl peroxide (DCP) were added and mixed again for 1-2 minutes to obtain a uniformly mixed compound.

[0074] Filtering: the rubber compound is extruded and filtered at 100-130 DEG C by a rubber filter with three layers of filter screen, wherein the mesh size of the three layers of filter screen is 160 mesh, 100 mesh and 60 mesh in the order of passing of the rubber compound, to obtain a filtered rubber compound;

[0075] Granulation: the filtered rubber compound is extruded and granulated at 120-135 DEG C by a rubber extruder with single screw reciprocating extrusion, to obtain rubber particles;

[0076] Drying: the rubber particles are dried in a sealed pipeline by purified hot air (containing no dust particles greater than 10 microns), and after cooling, the rubber particles are placed for 6-12 hours to recover the fatigue of the rubber compound, relax the mechanical stress during mixing, and allow the compounding agents to continue to diffuse during the placement process to promote uniform dispersion, to obtain an insulation material product.

[0077] The above insulation material product is extruded together with other structural materials for producing cables by a continuous steam low-temperature vulcanization production line to produce a 66kV distortion-resistant soft cable for offshore wind power, samples are taken from the cable and tested according to the standard TI CW22-2022, the specific test items and test results are shown in Table 4.

[0078] Table 4 Test results of Example 3

[0079]

[0080] As shown in Table 4, the insulation material product prepared in this example has excellent voltage breakdown test performance, extremely low partial discharge value, extremely large mechanical performance margin before and after aging, good thermal stability and excellent insulation performance when extruded by a continuous steam low-temperature vulcanization production line to produce a 66kV distortion-resistant soft cable for offshore wind power.

[0081] Example 4

[0082] This embodiment discloses a preparation method of an insulation material, comprising:

[0083] As shown in Figure 2 This embodiment discloses a preparation method of an insulation material, comprising:

[0084] Ingredients: as shown in Table 5, 100 parts of a terpolymer ethylene-propylene rubber (including non-conjugated diene 3.5%, ethylene 70%, the rest being propylene, the Mooney viscosity of the terpolymer ethylene-propylene rubber (ML 1+4, 121°C) being 35), 2.5 parts of triallyl isocyanurate (TAIC), 2.5 parts of dicumyl peroxide (DCP), 60 parts of active calcined clay, 1 part of 2-mercaptobenzimidazole (MB), 1.5 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD), 2.5 parts of microcrystalline wax, 10 parts of liquid paraffin, 1.5 parts of zinc oxide, 5 parts of lead oxide, 0.9 parts of vinyl-tris(2-methoxyethoxy)silane (A172), and 1.2 parts of bis-[γ-(triethoxysilyl)propyl]tetrasulfide (Si69) were weighed in parts by weight;

[0085] Table 5 Ingredient table of Example 4

[0086] Serial number Material name Parts by weight 1 EPDM 100 2 TAIC 2.5 3 DCP 2.5 4 Activated calcined clay 60 5 MB 1 6 RD 1.5 7 Microcrystalline wax 2.5 8 Liquid paraffin 10 9 Zinc oxide 1.5 10 Lead oxide 5 11 A172 0.9 12 Si69 1.2 Total 188.6

[0087] Mixing: first, the terpolymer ethylene-propylene rubber 100 parts was put into the internal mixer, then 2-mercaptobenzimidazole (MB) 1 part, 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD) 1.5 parts, microcrystalline wax 2.5 parts, liquid paraffin 10 parts, zinc oxide 1.5 parts, lead oxide 5 parts were added, and mixed for 1-2 min, so that MB, RD, microcrystalline wax, liquid paraffin, zinc oxide, and lead oxide were uniformly dispersed in the terpolymer ethylene-propylene rubber, to obtain a first mixture with proper plasticity and uniformity; then active calcined clay 65 parts, vinyl-tris(2-methoxyethoxy)silane (A172) 0.9 parts, and bis-[γ-(triethoxysilyl)propyl]tetrasulfide 1.2 parts were added, and continued to mix for 3-4 min, so that the active calcined clay and the terpolymer ethylene-propylene rubber produced a certain aggregation on the phase interface to generate bound rubber, to obtain a second mixture; finally, triallyl isocyanurate (TAIC) 2.5 parts and dicumyl peroxide (DCP) 2.5 parts were added, and mixed again for 1-2 min, to obtain a uniformly mixed rubber compound;

[0088] Filtering: the rubber compound was extruded and filtered at 100-130°C using a rubber filter with three layers of filter screens, wherein the mesh sizes of the three layers of filter screens were 160 mesh, 100 mesh, and 60 mesh in the order of passing of the rubber compound, to obtain a filtered rubber compound;

[0089] Pelletizing: the filtered rubber compound was extruded and pelletized at 120-135°C using a rubber extruder with a single-screw reciprocating extrusion mode, to obtain rubber pellets;

[0090] Drying: The rubber particles are placed in a sealed tube and dried with purified hot air (free from dust particles greater than 10 μm), cooled and left to rest for 6-12 h, to allow the rubber particle compound to recover from fatigue, to relax the mechanical stresses to which it was subjected during mixing, to allow the formulation to continue to diffuse during the rest period, to promote uniform dispersion, and to obtain the insulating material product.

[0091] The insulating material product is used together with other structural materials for producing a cable to produce a 66 kV distortion-resistant soft cable for offshore wind power by using a continuous steam low-temperature vulcanization production line, samples are taken from the cable and tested according to the standard TI CW22-2022, and the specific test items and test results are shown in Table 6.

[0092] Table 6 Test results of Example 4

[0093]

[0094] As can be seen from Table 6, the insulating material product produced in this example has excellent voltage breakdown test performance, extremely low partial discharge value, extremely large mechanical performance margin before and after aging, good thermal stability, and excellent insulating performance when used to produce a 66 kV distortion-resistant soft cable for offshore wind power by using a continuous steam low-temperature vulcanization production line.

[0095] Example 5

[0096] This example discloses a 66 kV cable for offshore wind power, which comprises an insulating layer made of the insulating material of any one of Examples 1-4.

[0097] It can be understood that the above embodiments are only exemplary embodiments adopted for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and essence of the present application, and these modifications and improvements are also considered to be within the protection scope of the present application.

Claims

1. An insulating material, characterized in that, Components comprising the following parts by weight: Ethylene propylene rubber 100 parts; Vulcanization system 1-5 parts; Reinforcing system 40-60 parts; Protective system 1-5 parts; Plasticizing system 4-10 parts; Activation system 2-10 parts; Coupling agent 0.5-2.5 parts; The ethylene propylene rubber is a ternary ethylene propylene rubber, which comprises 2.5%-4% of a third monomer, 65%-75% of ethylene, and the rest is propylene, in terms of weight ratio, the third monomer is a non-conjugated diene hydrocarbon, and the Mooney viscosity ML 1+4, 121℃ of the ternary ethylene propylene rubber is 25-40; The vulcanization system is a combination of triallyl isocyanurate and dicumyl peroxide, and the weight ratio of the triallyl isocyanurate to the dicumyl peroxide is (0.5-2.5):(0.5-2.5); The reinforcing system is active calcined clay, and the calcination temperature of the active calcined clay is 650-800℃; The protective system is a combination of 2-mercaptobenzimidazole, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and microcrystalline wax, and the weight ratio of the 2-mercaptobenzimidazole, the 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and the microcrystalline wax is (0.25-1):(0.25-1.5):(0.5-2.5); The plasticizing system is liquid paraffin; The activation system is zinc oxide and lead oxide, and the weight ratio of the zinc oxide to the lead oxide is (1.5-3):(0.5-7); The coupling agent is vinyl-tris(2-methoxyethoxy)silane and bis-[gamma-(triethoxysil)propyl]tetrasulfide, and the weight ratio of the vinyl-tris(2-methoxyethoxy)silane to the bis-[gamma-(triethoxysil)propyl]tetrasulfide is (0.3-1):(0.2-1.5).

2. A preparation method of an insulating material, comprising: Batching: weighing ethylene propylene rubber, a vulcanization system, a reinforcing system, a protective system, a plasticizing system, an activation system, and a coupling agent according to the insulating material of claim 1; Mixing: first, putting the ethylene propylene rubber, the activation system, the vulcanization system, and the plasticizing system into a mixer for mixing, then adding the reinforcing system and the coupling agent for continuous mixing, and finally adding the vulcanization system for mixing to obtain a mixed rubber; Filtering: extruding and filtering the mixed rubber with a rubber filter to obtain a filtered mixed rubber with a mesh size of 60-160; Pelletizing: extruding and pelletizing the filtered mixed rubber with a single-screw reciprocating rubber extruder to obtain rubber particles; Drying: drying the rubber particles with purified hot air, and obtaining an insulating material product after cooling.

3. The method of claim 2, wherein the insulation material is prepared by a process comprising: The temperature for extruding and filtering is 100-130℃, and the temperature for extruding and pelletizing is 120-135℃.

4. A 66 kV cable for offshore wind power, comprising an insulation layer, characterized in that, The insulating layer is made of the insulating material of claim 1.

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