Insulating cable sheath material and preparation method and application thereof

Abstract

The present invention relates to an insulating cable sheath material and a preparation method and application thereof, and relates to the technical field of materials. The insulating cable sheath material comprises the following components by weight: 55-65 parts of a first polyethylene, 30-45 parts of a second polyethylene, 12-20 parts of a filler, 10-15 parts of a compatibilizer, 20-40 parts of a plasticizer, 0.2-0.5 parts of a migration inhibitor, 1-5 parts of an antioxidant, and 1-5 parts of a lubricant. The present invention uses low-density polyethylene and ultra-high molecular weight polyethylene of suitable proportions as a base material system, and simultaneously introduces a crown ether compound containing a double benzene ring structure as a migration inhibitor, thereby not only reducing the plasticizer migration rate in the insulating cable sheath material, but also enhancing its heat aging resistance, thereby making up for the deficiencies of existing insulating cable sheath materials, and having broad application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of materials, and in particular to an insulating cable sheath material and a preparation method and application thereof. Background Art

[0002] As an important medium for power transmission, insulated cables play a vital role in modern society. As a key component to protect the internal structure of the cable and ensure safe and stable power transmission, the performance of the insulating cable sheath material directly affects the service life and safety of the cable.

[0003] At present, most insulating cable sheath materials are made of plastic materials such as polyethylene. Although these materials have certain insulation and mechanical strength, there are still many problems in the actual application process. For example, on the one hand, the migration of additives such as plasticizers in the traditional polyethylene sheath material during long-term use can easily lead to a decline in material performance, such as reduced hardness and weakened toughness, which in turn affects the insulation performance and mechanical protection ability of the cable. The migration of plasticizers not only shortens the service life of the cable, but also may cause safety hazards. On the other hand, with the continuous development of modern power systems and communication networks, higher requirements are placed on the heat aging resistance of cable sheath materials. Traditional polyethylene materials are prone to aging in high temperature environments, resulting in material performance degradation and affecting the normal operation of the cable. Summary of the invention

[0004] In order to solve the above problems, the present invention provides an insulating cable sheath material and a preparation method and application thereof.

[0005] In a first aspect, the present invention provides an insulating cable sheath material, which comprises the following components in parts by weight:

[0006] 55-65 parts of the first polyethylene, 30-45 parts of the second polyethylene, 12-20 parts of the filler, 10-15 parts of the compatibilizer, 20-40 parts of the plasticizer, 0.2-0.5 parts of the migration inhibitor, 1-5 parts of the antioxidant and 1-5 parts of the lubricant;

[0007] Wherein, the first polyethylene is low-density polyethylene, the second polyethylene is ultra-high molecular weight polyethylene, and the migration inhibitor is a crown ether compound containing a double benzene ring structure.

[0008] Furthermore, the weight ratio of the first polyethylene to the second polyethylene is 1.5:1.

[0009] Furthermore, the insulating cable sheath material comprises the following components in parts by weight:

[0010] 60 parts of the first polyethylene, 40 parts of the second polyethylene, 17 parts of the filler, 12.5 parts of the compatibilizer, 30 parts of the plasticizer, 0.3 parts of the migration inhibitor, 3 parts of the antioxidant and 3 parts of the lubricant.

[0011] Furthermore, the density of the low-density polyethylene is 0.91-0.93 g / cm³; the weight-average molecular weight of the ultra-high molecular weight polyethylene is 3 million-5 million.

[0012] Furthermore, the crown ether compound containing a double benzene ring structure includes at least one of dibenzo-15-crown-5, dibenzo-18-crown-6 and dibenzo-24-crown-8.

[0013] Furthermore, the filler includes calcium carbonate powder; the compatibilizer includes at least one of POE-g-MAH and POE-g-AA; and the plasticizer includes at least one of dimethyl phthalate, dicyclohexyl phthalate and dioctyl terephthalate.

[0014] Further, the antioxidant includes at least one of antioxidant 1010 and antioxidant 168; and the lubricant includes at least one of zinc stearate and calcium stearate.

[0015] In a second aspect, the present invention provides a method for preparing the insulating cable sheath material according to any one of the first aspects, the preparation method comprising the following steps:

[0016] The first polyethylene, the second polyethylene, the plasticizer and the migration inhibitor are heated and mixed to obtain a first mixture;

[0017] Adding the remaining components to the first mixed material and mixing them to obtain a second mixed material;

[0018] The second mixed material is added into a twin-screw extruder for extrusion granulation to obtain the insulating cable sheath material.

[0019] Furthermore, the working condition parameters of the heating and mixing include: temperature of 75-90°C, stirring speed of 300-400 rpm, stirring time of 15-25 minutes;

[0020] The mixing working condition parameters include: temperature of 110-120°C and time of 10-20 minutes;

[0021] The working condition parameters of the twin-screw extruder include: the body temperature of the twin-screw extruder is 185°C to 210°C, the extruder head temperature is 190°C to 205°C, and the screw speed is 100r / min to 150r / min.

[0022] In a third aspect, the present invention provides use of the insulating cable sheath material described in any one of the first aspect and the insulating cable sheath material prepared by the preparation method described in any one of the second aspect in preparing a high-voltage insulated cable.

[0023] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0024] The embodiment of the present invention provides an insulating cable sheath material. The present invention uses low-density polyethylene and ultra-high molecular weight polyethylene in appropriate proportions as the base material system, and introduces a crown ether compound containing a double benzene ring structure as a migration inhibitor, which not only reduces the plasticizer migration rate in the insulating cable sheath material, but also enhances its heat aging resistance, making up for the shortcomings of existing insulating cable sheath materials, and has broad application prospects. Specifically:

[0025] 1. Selection and proportion of base material system: Low-density polyethylene (LDPE): As the first polyethylene, LDPE has good processing performance and flexibility, and its lower density helps to reduce the weight of the cable while providing sufficient insulation performance; Ultra-high molecular weight polyethylene (UHMWPE): As the second polyethylene, UHMWPE has extremely high molecular weight and excellent mechanical strength, wear resistance and chemical stability. The present invention uses low-density polyethylene and ultra-high molecular weight polyethylene with appropriate proportions as the base material system, which can not only significantly improve the overall strength and durability of the sheath material, but also help to form a tighter molecular structure, enhance mechanical strength and heat resistance; at the same time, it is conducive to enhancing the compatibility with crown ether compounds containing a double benzene ring structure, thereby reducing the plasticizer migration rate.

[0026] 2. Innovative application of migration inhibitors: The present invention discovers for the first time that crown ether compounds containing a special double benzene ring structure can be used as migration inhibitors in insulating cable sheath materials. The presence of the special double benzene ring structure can enhance the π-π stacking effect and hydrophobic effect between crown ether molecules, which is beneficial to form a stable complex with plasticizer molecules through its hole structure, which not only slows down the migration of the plasticizer, but also improves the overall stability of the sheath material by enhancing the intermolecular interaction force. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 A schematic flow chart of a method for preparing an insulating cable sheath material provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0032] In a first aspect, the present invention provides an insulating cable sheath material, which comprises the following components in parts by weight:

[0033] 55-65 parts of the first polyethylene, 30-45 parts of the second polyethylene, 12-20 parts of the filler, 10-15 parts of the compatibilizer, 20-40 parts of the plasticizer, 0.2-0.5 parts of the migration inhibitor, 1-5 parts of the antioxidant and 1-5 parts of the lubricant;

[0034] Wherein, the first polyethylene is low-density polyethylene, the second polyethylene is ultra-high molecular weight polyethylene, and the migration inhibitor is a crown ether compound containing a double benzene ring structure.

[0035] The embodiment of the present invention provides an insulating cable sheath material. The embodiment of the present invention provides an insulating cable sheath material. The present invention uses low-density polyethylene and ultra-high molecular weight polyethylene in suitable proportions as a base material system, and introduces a crown ether compound containing a double benzene ring structure as a migration inhibitor, which not only reduces the plasticizer migration rate in the insulating cable sheath material, but also enhances its heat aging resistance, thereby making up for the shortcomings of existing insulating cable sheath materials and having broad application prospects.

[0036] In the present invention, low-density polyethylene (LDPE), also known as high-pressure polyethylene, is a plastic material with a density of 0.91~0.93g / cm³. It is a thermoplastic resin obtained by free radical polymerization reaction with polymerization-grade ethylene as a polymerization monomer under the action of a peroxide initiator. In some specific embodiments, commercially available products such as LD607 (M187) of Yanshan Petrochemical, 2102TN00 of Qilu Petrochemical, ExxonMobil™ LDPE LD051.LQ (density of 0.919g / cm³), ExxonMobil™ LDPE LD 080 Series (density of 0.9200.919g / cm³) and other series of low-density polyethylene resins can be used, or they can be self-made according to the existing public preparation process of low-density polyethylene.

[0037] In the present invention, ultra high molecular weight polyethylene (UHMWPE) is a linear structure polyethylene with a molecular weight of more than 3 million, which is considered to be one of the engineering plastics with the best comprehensive performance. It has excellent properties such as wear resistance, impact resistance, corrosion resistance, self-lubrication, and impact energy absorption. In some specific embodiments, ultra high molecular weight polyethylene can be selected from commercial products such as Korea Petrochemical Corporation, product model UHMWPEU050 (weight average molecular weight of 5 million), product model UHMWPEU050 H (weight average molecular weight of 3.7 million), etc., or can be self-made according to the existing public preparation process of ultra high molecular weight polyethylene.

[0038] In some specific embodiments, the weight ratio of the first polyethylene to the second polyethylene is 1.5:1.

[0039] In some specific embodiments, the insulating cable sheath material comprises the following components in parts by weight:

[0040] 60 parts of the first polyethylene, 40 parts of the second polyethylene, 17 parts of the filler, 12.5 parts of the compatibilizer, 30 parts of the plasticizer, 0.3 parts of the migration inhibitor, 3 parts of the antioxidant and 3 parts of the lubricant.

[0041] In some specific embodiments, the density of the low-density polyethylene is 0.91-0.93 g / cm³; the weight-average molecular weight of the ultra-high molecular weight polyethylene is 3 million-5 million.

[0042] In some specific embodiments, the crown ether compound containing a double benzene ring structure includes at least one of dibenzo-15-crown-5 (CAS registration number is 14262-60-3), dibenzo-18-crown-6 (CAS registration number is 14187-32-7) and dibenzo-24-crown-8 (CAS registration number is 14174-09-5).

[0043] In some specific embodiments, the filler includes calcium carbonate powder; the compatibilizer includes at least one of POE-g-MAH and POE-g-AA; and the plasticizer includes at least one of dimethyl phthalate, dicyclohexyl phthalate and dioctyl terephthalate.

[0044] In some specific embodiments, the antioxidant includes at least one of antioxidant 1010 and antioxidant 168; and the lubricant includes at least one of zinc stearate and calcium stearate.

[0045] It should be noted that the component raw materials involved in the insulating cable sheath material provided in the embodiment of the present invention, unless otherwise specified or specified, can directly use commercially available products.

[0046] In a second aspect, based on a general inventive concept, the present invention provides a method for preparing the insulating cable sheath material according to any one of the first aspects, such as Figure 1 As shown, the preparation method comprises the following steps:

[0047] The first polyethylene, the second polyethylene, the plasticizer and the migration inhibitor are heated and mixed to obtain a first mixture;

[0048] Adding the remaining components to the first mixed material and mixing them to obtain a second mixed material;

[0049] The second mixed material is added into a twin-screw extruder for extrusion granulation to obtain the insulating cable sheath material.

[0050] The method for preparing the insulating cable sheath material provided by the present invention is simple to operate, does not require additional specific equipment, and is suitable for industrial production. At the same time, the method for preparing the insulating cable sheath material is based on the insulating cable sheath material described in any one of the first aspects above, so it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0051] In some specific embodiments, the working condition parameters of the heating and mixing include: temperature of 75-90° C., stirring speed of 300-400 rpm, and stirring time of 15-25 minutes;

[0052] The mixing working condition parameters include: temperature of 110-120°C and time of 10-20 minutes;

[0053] The working condition parameters of the twin-screw extruder include: the body temperature of the twin-screw extruder is 185°C to 210°C, the extruder head temperature is 190°C to 205°C, and the screw speed is 100r / min to 150r / min.

[0054] It should be noted that the operating steps and parameters involved in the preparation process of the insulating cable sheath material provided in the embodiment of the present invention can be carried out according to the existing preparation process or using existing equipment unless otherwise specified or specifically described.

[0055] In a third aspect, based on a general inventive concept, the present invention provides the use of the insulating cable sheath material described in any one of the first aspect and the insulating cable sheath material prepared by the preparation method described in any one of the second aspect in the preparation of high-voltage insulated cables.

[0056] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples that do not specify specific conditions are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0057] Example 1

[0058] This example provides an insulating cable sheath material, which includes the following components in parts by weight: 60 parts of a first polyethylene, 40 parts of a second polyethylene, 17 parts of a filler, 12.5 parts of a compatibilizer, 30 parts of a plasticizer, 0.3 parts of a migration inhibitor, 3 parts of an antioxidant, and 3 parts of a lubricant;

[0059] The first polyethylene is a low-density polyethylene with a density of 0.91~0.93g / cm³, the second polyethylene is an ultra-high molecular weight polyethylene with a weight-average molecular weight of 3 million to 5 million, the migration inhibitor is dibenzo-15-crown ether-5, the filler is calcium carbonate powder, the compatibilizer is POE-g-MAH, the plasticizer is dimethyl phthalate, the antioxidant is antioxidant 1010, and the lubricant is calcium stearate.

[0060] The preparation method of the above insulating cable sheath material comprises the following steps:

[0061] The first polyethylene, the second polyethylene, the plasticizer and the migration inhibitor are heated and mixed to obtain a first mixture;

[0062] Adding the remaining components to the first mixed material and mixing them to obtain a second mixed material;

[0063] Adding the second mixed material into a twin-screw extruder for extrusion granulation to obtain the insulating cable sheath material;

[0064] The working condition parameters of the heating and mixing include: temperature of 85°C, stirring speed of 350 rpm, and stirring time of 20 minutes;

[0065] The mixing working condition parameters include: temperature of 115°C and time of 15 minutes;

[0066] The working condition parameters of the twin-screw extruder include: the body temperature of the twin-screw extruder is 205° C., the extruder head temperature is 195° C., and the screw speed is 120 r / min.

[0067] Example 2

[0068] This example provides an insulating cable sheath material, which includes the following components in parts by weight: 65 parts of a first polyethylene, 30 parts of a second polyethylene, 20 parts of a filler, 15 parts of a compatibilizer, 40 parts of a plasticizer, 0.5 parts of a migration inhibitor, 5 parts of an antioxidant, and 5 parts of a lubricant;

[0069] The first polyethylene is a low-density polyethylene with a density of 0.91~0.93g / cm³, the second polyethylene is an ultra-high molecular weight polyethylene with a weight-average molecular weight of 3 million to 5 million, the migration inhibitor is dibenzo-24-crown ether-8, the filler is calcium carbonate powder, the compatibilizer is POE-g-AA, the plasticizer is dicyclohexyl phthalate, the antioxidant is antioxidant 168, and the lubricant is zinc stearate.

[0070] The preparation method of the above insulating cable sheath material comprises the following steps:

[0071] The first polyethylene, the second polyethylene, the plasticizer and the migration inhibitor are heated and mixed to obtain a first mixture;

[0072] Adding the remaining components to the first mixed material and mixing them to obtain a second mixed material;

[0073] Adding the second mixed material into a twin-screw extruder for extrusion granulation to obtain the insulating cable sheath material;

[0074] The working condition parameters of the heating and mixing include: temperature of 75°C, stirring speed of 300 rpm, and stirring time of 25 minutes;

[0075] The mixing working condition parameters include: temperature of 110°C and time of 20 minutes;

[0076] The working condition parameters of the twin-screw extruder include: the body temperature of the twin-screw extruder is 205° C., the extruder head temperature is 195° C., and the screw speed is 120 r / min.

[0077] Example 3

[0078] This example provides an insulating cable sheath material, which includes the following components in parts by weight: 55 parts of a first polyethylene, 45 parts of a second polyethylene, 12 parts of a filler, 10 parts of a compatibilizer, 20 parts of a plasticizer, 0.2 parts of a migration inhibitor, 1 part of an antioxidant, and 1 part of a lubricant;

[0079] The first polyethylene is a low-density polyethylene with a density of 0.91~0.93g / cm³, the second polyethylene is an ultra-high molecular weight polyethylene with a weight-average molecular weight of 3 million to 5 million, the migration inhibitor is dibenzo-18-crown ether-6, the filler is calcium carbonate powder, the compatibilizer is POE-g-AA, the plasticizer is dicyclohexyl phthalate, the antioxidant is antioxidant 168, and the lubricant is zinc stearate.

[0080] The preparation method of the above insulating cable sheath material comprises the following steps:

[0081] The first polyethylene, the second polyethylene, the plasticizer and the migration inhibitor are heated and mixed to obtain a first mixture;

[0082] Adding the remaining components to the first mixed material and mixing them to obtain a second mixed material;

[0083] Adding the second mixed material into a twin-screw extruder for extrusion granulation to obtain the insulating cable sheath material;

[0084] The working condition parameters of the heating and mixing include: temperature of 90°C, stirring speed of 400 rpm, and stirring time of 15 minutes;

[0085] The mixing working condition parameters include: temperature of 120°C and time of 10 minutes;

[0086] The working condition parameters of the twin-screw extruder include: the body temperature of the twin-screw extruder is 205° C., the extruder head temperature is 195° C., and the screw speed is 120 r / min.

[0087] Comparative Example 1

[0088] This example provides an insulating cable sheath material and a preparation method thereof, which is different from Example 1 only in that the weight fraction of the first polyethylene is adjusted to 40 parts, and the weight fraction of the second polyethylene is adjusted to 60 parts; the remaining steps and parameters are the same.

[0089] Comparative Example 2

[0090] This example provides an insulating cable sheath material and a preparation method thereof, which is different from Example 1 only in that dibenzo-15-crown ether-5 is adjusted to benzo-15-crown ether-5; the remaining steps and parameters are the same.

[0091] Test Case

[0092] In this example, the performance of the insulating cable sheath materials obtained in Examples 1 to 3 and Comparative Examples 1 to 2 was tested.

[0093] Test methods and standards: 1) The plasticizer migration rate of the insulating cable sheath material was tested with reference to the test method recorded in HG / T 4454-2012 "Determination of plasticizer migration of plastics". The test results are shown in Table 1; 2) The heat aging performance test (158℃×168h) was carried out with reference to GB / T2951.12-2008 "General test methods for insulation and sheath materials of electric and optical cables Part 12: General test methods-Heat aging test methods". The test results are shown in Table 2.

[0094] Table 1

[0095]

[0096] Table 2

[0097]

[0098] It can be seen from Table 1 and Table 2 that, compared with Comparative Examples 1-2, the insulating cable sheath materials provided in Examples 1-3 of the present invention use low-density polyethylene and ultra-high molecular weight polyethylene in appropriate proportions as the base material system, and introduce crown ether compounds containing a double benzene ring structure as migration inhibitors, which not only reduces the plasticizer migration rate in the insulating cable sheath material, but also enhances its heat aging resistance. In addition, the insulating cable sheath materials provided in the embodiments of the present invention also have excellent mechanical properties and insulation properties. For example, the tensile strength of the insulating cable sheath material obtained in Example 1 can reach 24.1Mpa, and the volume resistivity can reach 7.3×10 12 Ω·m.

[0099] Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present invention; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0100] In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. Among them, A and B can be singular or plural. In this article, "at least one" means one or more, and "plural" means two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple.

[0101] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An insulating cable sheath material, characterized in that: The insulating cable sheath material comprises the following components in parts by weight: 55-65 parts of the first polyethylene, 30-45 parts of the second polyethylene, 12-20 parts of the filler, 10-15 parts of the compatibilizer, 20-40 parts of the plasticizer, 0.2-0.5 parts of the migration inhibitor, 1-5 parts of the antioxidant and 1-5 parts of the lubricant; Wherein, the first polyethylene is low-density polyethylene, the second polyethylene is ultra-high molecular weight polyethylene, and the migration inhibitor is a crown ether compound containing a double benzene ring structure; The crown ether compound containing a double benzene ring structure is selected from at least one of dibenzo-15-crown-5, dibenzo-18-crown-6 and dibenzo-24-crown-8.

2. The insulating cable sheath material according to claim 1, characterized in that: The weight ratio of the first polyethylene to the second polyethylene is 1.5:

1.

3. The insulating cable sheath material according to claim 1, characterized in that: The insulating cable sheath material comprises the following components in parts by weight: 60 parts of the first polyethylene, 40 parts of the second polyethylene, 17 parts of the filler, 12.5 parts of the compatibilizer, 30 parts of the plasticizer, 0.3 parts of the migration inhibitor, 3 parts of the antioxidant and 3 parts of the lubricant.

4. The insulating cable sheath material according to claim 1, characterized in that: The density of the low-density polyethylene is 0.91-0.93 g / cm³; the weight-average molecular weight of the ultra-high molecular weight polyethylene is 3 million-5 million.

5. The insulating cable sheath material according to claim 1, characterized in that: The filler includes calcium carbonate powder; the compatibilizer includes at least one of POE-g-MAH and POE-g-AA; and the plasticizer includes at least one of dimethyl phthalate, dicyclohexyl phthalate and dioctyl terephthalate.

6. The insulating cable sheath material according to claim 1, characterized in that: The antioxidant includes at least one of antioxidant 1010 and antioxidant 168; the lubricant includes at least one of zinc stearate and calcium stearate.

7. A method for preparing the insulating cable sheath material according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: The first polyethylene, the second polyethylene, the plasticizer and the migration inhibitor are heated and mixed to obtain a first mixture; Adding the remaining components to the first mixed material and mixing them to obtain a second mixed material; The second mixed material is added into a twin-screw extruder for extrusion granulation to obtain the insulating cable sheath material.

8. The method for preparing the insulating cable sheath material according to claim 7, characterized in that: The working condition parameters of the heating and mixing include: temperature of 75-90°C, stirring speed of 300-400 rpm, and stirring time of 15-25 minutes; The mixing working condition parameters include: temperature of 110-120°C and time of 10-20 minutes; The working condition parameters of the twin-screw extruder include: the body temperature of the twin-screw extruder is 185°C to 210°C, the extruder head temperature is 190°C to 205°C, and the screw speed is 100r / min to 150r / min.

9. Use of the insulating cable sheath material according to any one of claims 1 to 6 or the insulating cable sheath material prepared by the preparation method according to any one of claims 7 to 8 in preparing a high-voltage insulated cable.

Images