Polypropylene-based insulation material, process for its production and use, and cable product

Abstract

The application provides a polypropylene-based insulating material and a preparation method and application thereof and a cable product. The polypropylene-based insulating material comprises the following raw materials in parts by weight: polypropylene in-reactor alloy resin, 20-50 parts; heat-resistant polypropylene, 10-40 parts; styrene-based thermoplastic elastomer, 35-50 parts; wherein the stereoregularity of the molecular chain of the heat-resistant polypropylene is greater than or equal to 96%. The polypropylene-based insulating material provided by the application can realize the coupling promotion of heat deformation resistance, mechanical toughness and electrical performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high polymer materials, in particular to a polypropylene-based insulating material and a preparation method and application thereof, and a cable product. BACKGROUND

[0002] With the continuous improvement of the process of national urbanization and modernization, the demand for electricity is increasing year by year. At present, cross-linked polyethylene is mostly used for power cable insulation. However, cross-linked polyethylene has the problems of low operating temperature, limited load capacity, complex production process (high temperature vulcanization, degassing process, etc.), cross-linking by-products reducing electrical insulation performance, and difficulty in recycling, which cannot meet the green and low-carbon development direction of future power equipment.

[0003] Polypropylene-based thermoplastic high-voltage cable has the characteristics of low production energy consumption, high operating temperature, and recyclability, and is more suitable for the development requirements of future power grids. Developing thermoplastic high-voltage cable to replace cross-linked polyethylene insulation is the future direction of the cable industry. The development of polypropylene cable in China is still in its infancy, and the performance of polypropylene insulation is improved and enhanced mainly through blending modification, copolymerization modification, grafting modification, nano modification, and crystal type regulation. However, there are still great challenges to achieve the coupling enhancement of multiple properties. For example, the current polypropylene insulation still has the problem of being difficult to achieve the coupling enhancement of heat distortion resistance, mechanical toughness, and electrical performance. SUMMARY

[0004] Therefore, the present application provides a polypropylene-based insulating material and a preparation method and application thereof, and a cable product, which can achieve the coupling enhancement of heat distortion resistance, mechanical toughness, and electrical performance of the polypropylene-based insulating material.

[0005] The first aspect of the present application provides a polypropylene-based insulating material, which comprises the following raw materials in parts by weight:

[0006] Polypropylene in-reactor alloy resin, 20-50 parts;

[0007] Heat-resistant polypropylene, 10-40 parts;

[0008] Styrene-based thermoplastic elastomer, 35-50 parts;

[0009] The molecular chain stereoregularity of the heat-resistant polypropylene is greater than or equal to 96%.

[0010] In some embodiments of the present application, the polypropylene in-reactor alloy resin comprises a polypropylene matrix and a rubber phase.

[0011] Optionally, the particle size of the rubber phase is 0.2-1 μm.

[0012] Optionally, the rubber phase has a mass fraction of 25% to 28% in the polypropylene kettle alloy resin.

[0013] Optionally, the rubber phase comprises an ethylene-propylene random copolymer.

[0014] In some embodiments of the present application, the heat-resistant polypropylene has a melt flow rate of 2.0 g / 10 min to 4.0 g / 10 min at 230 ℃ and under a load of 2.16 kg.

[0015] In some embodiments of the present application, the styrene-based thermoplastic elastomer comprises a styrene / ethylene-propylene block copolymer.

[0016] Optionally, the styrene has a mass fraction of 20% to 35% in the styrene-based thermoplastic elastomer.

[0017] Optionally, in the styrene-based thermoplastic elastomer, the number of moles of ethylene is equal to the number of moles of propylene.

[0018] Optionally, the styrene / ethylene-propylene block copolymer has a number average molecular weight of 60,000 g / mol to 150,000 g / mol.

[0019] In some embodiments of the present application, further comprising, by weight parts, the following raw materials: an antioxidant, 0.2 parts to 0.5 parts.

[0020] A second aspect of the present application provides a method for preparing the polypropylene-based insulation material of the first aspect of the present application, comprising:

[0021] Meltingly blending the raw materials to prepare the polypropylene-based insulation material.

[0022] In some embodiments of the present application, the meltingly blending process satisfies at least one of the following conditions:

[0023] (1) the meltingly blending process has a temperature of 180 ℃ to 220 ℃;

[0024] (2) the meltingly blending process has a time of 5 min to 10 min;

[0025] (3) the meltingly blending process has a rotation speed of 80 r / min to 150 r / min.

[0026] In some embodiments of the present application, during the meltingly blending process, the blending mode comprises one of banburying and extruding.

[0027] The third aspect of the present application provides a use of the polypropylene-based insulation material according to the first aspect of the present application or the polypropylene-based insulation material prepared according to the method of the second aspect of the present application in preparing a cable product.

[0028] The fourth aspect of the present application provides a cable product comprising the polypropylene-based insulation material according to the first aspect of the present application or the polypropylene-based insulation material prepared according to the method of the second aspect of the present application.

[0029] In the raw material of the polypropylene-based insulation material provided by the present application, the heat-resistant polypropylene and the styrene-based thermoplastic elastomer are used in combination, and the combined use amount of the two components is controlled within the range selected by the present application, so that the heat deformation resistance and the mechanical toughness of the polypropylene-based insulation material can be improved at the same time, and the problem that the heat deformation resistance and the mechanical toughness of the polypropylene insulation are difficult to be considered at the same time is solved. And by using the heat-resistant polypropylene, the styrene-based thermoplastic elastomer and the polypropylene in-reactor alloy resin in combination, and controlling the combined use amount of each within the range selected by the present application, the polypropylene insulation can also maintain good electrical properties, and the heat deformation resistance, the mechanical toughness and the electrical properties of the polypropylene-based insulation material can be improved in combination. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 A bending modulus column chart of the polypropylene-based insulation material prepared in Comparative Examples 1-3 and Example 1-6.

[0031] Figure 2 A breakdown field strength column chart of the polypropylene-based insulation material prepared in Comparative Examples 1-3 and Example 1-6. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present application, the present application will be described more fully below. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0033] For the sake of simplicity, only some numerical ranges are explicitly disclosed in the present application. However, any lower limit can be combined with any upper limit to form a range not explicitly recited; and any lower limit can be combined with other lower limits to form a range not explicitly recited, and likewise any upper limit can be combined with any other upper limit to form a range not explicitly recited. In addition, although not explicitly recited, every point or individual number within a range of endpoints is included in that range. Thus, every midpoint or individual number can be combined as its own lower limit or upper limit with any other point or individual number or with other lower or upper limits to form a range not explicitly recited.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. It is to be understood that unless otherwise indicated, the terms "and / or," "wherein" and "whereby" include any and all combinations of one or more of the associated listed items. "Above," "below," "upper," "lower," and "top" are used for descriptive purposes only and are not intended to be limiting.

[0035] The foregoing summary of the application does not necessarily describe every disclosed embodiment or implementation of the application. The exemplary embodiments are described more fully below with reference to the accompanying drawings. In several places throughout the application, guidance is provided through a series of examples. These examples can be used in a variety of combinations, and each example is not limited to the only point of the guidance. In each instance, the representative group is listed only as a representative group and should not be interpreted as an exhaustive list.

[0036] The first aspect of the application provides a polypropylene-based insulation material, comprising the following raw materials by weight parts:

[0037] Polypropylene in-reactor alloy resin, 20-50 parts;

[0038] Heat-resistant polypropylene, 10-40 parts;

[0039] Styrene-based thermoplastic elastomer, 35-50 parts;

[0040] Wherein, the stereoregularity of the molecular chain of the heat-resistant polypropylene is ≥96%.

[0041] It can be understood that the polypropylene in-reactor alloy resin can be 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts or within the range consisting of any of the above values.

[0042] It can be understood that the heat-resistant polypropylene can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts or within the range consisting of any of the above values.

[0043] It can be understood that the styrene-based thermoplastic elastomer can be 35 parts, 40 parts, 45 parts, 50 parts or within the range consisting of any of the above values.

[0044] The raw material of the polypropylene-based insulation material provided in the present application comprises the above components, and the amount of each component is within the range selected in the present application. Among them, the selected heat-resistant polypropylene has a molecular chain stereoregularity ≥96%, that is, it has a high stereoregularity molecular chain structure, so it can form a perfect crystal structure skeleton, thereby helping to improve the heat deformation resistance of the polypropylene-based insulation material. In addition, the selected styrene-based thermoplastic elastomer has a highly entangled molecular chain network, which can realize elastic network deformation and can induce interfacial crazing or shear band, thereby imparting excellent mechanical toughness to the polypropylene-based insulation material and improving its mechanical toughness. At the same time, the selected polypropylene in-reactor alloy resin is also helpful to promote the polypropylene-based insulation material to maintain good electrical properties.

[0045] Therefore, by using heat-resistant polypropylene and styrene-based thermoplastic elastomer in combination, and controlling the combined use amount of the two components within the range selected in the present application, the heat deformation resistance and mechanical toughness of the polypropylene-based insulation material can be improved at the same time, solving the problem that the heat deformation resistance and mechanical toughness of polypropylene insulation are difficult to be considered. And by using heat-resistant polypropylene, styrene-based thermoplastic elastomer and polypropylene in-reactor alloy resin in combination, and controlling the combined use amount of each within the range selected in the present application, the polypropylene insulation can also maintain good electrical properties, realizing the coupled improvement of the heat deformation resistance, mechanical toughness and electrical properties of the polypropylene-based insulation material.

[0046] In the present application, the stereoregularity of the molecular chain of the heat-resistant polypropylene can be tested by infrared spectroscopy (such as Thermo Scientific Nicolet iS50).

[0047] In some embodiments, the polypropylene in-reactor alloy resin comprises a polypropylene matrix and a rubber phase.

[0048] In the present application, the polypropylene-based in-reactor alloy resin is a mixed resin composed of polypropylene and other olefin polymers, for example, but not limited to, rubber-like polymers such as ethylene-propylene copolymer. Among them, the rubber phase can be introduced in situ during the polymerization reaction of polypropylene.

[0049] In some embodiments, the particle size of the rubber phase is 0.2 μm to 1 μm. For example, the particle size of the rubber phase can be 0.2 μm, 0.4 μm, 0.6 μm, 0.8 μm, 1 μm or within the range consisting of any of the above values.

[0050] In some embodiments, the mass fraction of the rubber phase in the polypropylene in-reactor alloy resin is 25% to 28%. For example, the mass fraction can be 25%, 26%, 27%, 28% or within the range consisting of any of the above values.

[0051] The polypropylene kettle alloy resin includes a rubber phase, and the rubber phase has a mass percentage in the above range, which is beneficial to further improve the mechanical toughness of the polypropylene-based insulation material.

[0052] In some embodiments, the rubber phase includes an ethylene-propylene random copolymer.

[0053] In some embodiments, the heat-resistant polypropylene has a melt flow rate of 2 g / 10 min to 4 g / 10 min at 230℃ under a load of 2.16 kg. For example, the melt flow rate can be 2 g / 10 min, 2.5 g / 10 min, 3 g / 10 min, 3.5 g / 10 min, 4 g / 10 min, or within a range formed by any of the above values.

[0054] It can be understood that the "heat-resistant polypropylene" described in the present application is a kind of polypropylene, which can form a perfect crystal structure skeleton by controlling the molecular chain stereoregularity of polypropylene > 96%, so as to make it have good heat deformation resistance.

[0055] In some embodiments, the styrene-based thermoplastic elastomer includes a styrene / ethylene-propylene block copolymer.

[0056] In some embodiments, the mass percentage of styrene in the styrene-based thermoplastic elastomer is 20% to 35%. For example, the mass percentage can be 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 35%, or within a range formed by any of the above values.

[0057] In some embodiments, in the styrene-based thermoplastic elastomer, the number of moles of ethylene is equal to the number of moles of propylene.

[0058] The styrene-based thermoplastic elastomer includes a styrene / ethylene-propylene block copolymer, wherein the styrene block serves as a physical crosslinking point, and the ethylene-propylene block serves as a flexible molecular chain, so that the block copolymer has a highly entangled molecular chain network, and can realize elastic network deformation, thereby improving the mechanical toughness of the polypropylene-based insulation material used as a raw material.

[0059] In some embodiments, the number average molecular weight of the styrene / ethylene-propylene block copolymer is 60,000 g / mol to 150,000 g / mol. For example, the number average molecular weight can be 60,000 g / mol, 80,000 g / mol, 100,000 g / mol, 120,000 g / mol, 140,000 g / mol, 150,000 g / mol, or within a range formed by any of the above values.

[0060] Controlling the number average molecular weight of the styrene / ethylene-propylene block copolymer in the above range is beneficial to further improve the mechanical toughness of the polypropylene-based insulation material.

[0061] In some embodiments, further comprising by weight parts of the following raw materials: antioxidant, 0.2 parts to 0.5 parts.

[0062] In some embodiments, the antioxidant comprises antioxidant 1010.

[0063] The second aspect of the present application provides a method for preparing the polypropylene-based insulation material of the first aspect of the present application, which can comprise the following steps:

[0064] S10, melt blending the raw materials to prepare the polypropylene-based insulation material.

[0065] In some embodiments, the temperature of the melt blending is 180°C to 220°C. For example, the temperature can be 180°C, 190°C, 200°C, 210°C, 220°C or within a range formed by any of the above values.

[0066] In some embodiments, the time of the melt blending is 5 min to 10 min. For example, the time can be 5 min, 6 min, 7 min, 8 min, 9 min, 10 min or within a range formed by any of the above values.

[0067] In some embodiments, the rotational speed in the melt blending is 80 r / min to 150 r / min. For example, the rotational speed can be 80 r / min, 100 r / min, 120 r / min, 140 r / min, 150 r / min or within a range formed by any of the above values.

[0068] In some embodiments, during the melt blending, the blending mode comprises one of banburying and extruding.

[0069] Banburying or extruding and the like are beneficial to improve the dispersibility of the raw materials, and help to prepare the polypropylene-based insulation material with excellent comprehensive performance in toughness, elasticity and electrical stability.

[0070] The third aspect of the present application provides a use of the polypropylene-based insulation material of the first aspect of the present application or prepared by the method of the second aspect of the present application in preparing a cable product.

[0071] The fourth aspect of the present application provides a cable product comprising the polypropylene-based insulation material of the first aspect of the present application or prepared by the method of the second aspect of the present application.

[0072] Embodiment

[0073] The following specific examples more specifically describe the present disclosure, which are merely illustrative and not limiting, as various modifications and changes in the examples described herein will be obvious to those skilled in the art. Unless otherwise stated, all parts, percentages, and ratios reported herein are based on weight, and all reagents used in the examples are commercially available or synthesized according to conventional methods and used without further purification, and the instruments used in the examples are commercially available.

[0074] Embodiment 1

[0075] 20 parts of polypropylene kettle alloy resin, 30 parts of heat-resistant polypropylene, 50 parts of styrene-based thermoplastic elastomer, and 0.2 parts of antioxidant were weighed as raw materials, and were melt blended in an internal mixer to obtain a polypropylene-based insulation material. The melt blending process was as follows: the temperature was 180°C, the time was 5 minutes, and the rotation speed was 80 r / min.

[0076] Embodiment 2

[0077] 20 parts of polypropylene kettle alloy resin, 30 parts of heat-resistant polypropylene, 50 parts of styrene-based thermoplastic elastomer, and 0.2 parts of antioxidant were weighed as raw materials, and were melt blended in an internal mixer to obtain a polypropylene-based insulation material. The melt blending process was as follows: the temperature was 180°C, the time was 5 minutes, and the rotation speed was 80 r / min.

[0078] Embodiment 3

[0079] 20 parts of polypropylene kettle alloy resin, 30 parts of heat-resistant polypropylene, 50 parts of styrene-based thermoplastic elastomer, and 0.2 parts of antioxidant were weighed as raw materials, and were melt blended in an internal mixer to obtain a polypropylene-based insulation material. The melt blending process was as follows: the temperature was 180°C, the time was 5 minutes, and the rotation speed was 80 r / min.

[0080] Embodiment 4

[0081] 20 parts of polypropylene kettle alloy resin, 30 parts of heat-resistant polypropylene, 50 parts of styrene-based thermoplastic elastomer, and 0.2 parts of antioxidant were weighed as raw materials, and were melt blended in an internal mixer to obtain a polypropylene-based insulation material. The melt blending process was as follows: the temperature was 180°C, the time was 5 minutes, and the rotation speed was 80 r / min.

[0082] Embodiment 5

[0083] Take 50 parts of polypropylene alloy resin, 10 parts of heat-resistant polypropylene, 48 parts of styrene-based thermoplastic elastomer, 0.5 parts of antioxidant as raw material, melt blending in internal mixer, get polypropylene-based insulation material. The melt blending process is: temperature is 180℃, time is 5 minutes, speed is 80r / min.

[0084] Example 6

[0085] Take 50 parts of polypropylene alloy resin, 15 parts of heat-resistant polypropylene, 35 parts of styrene-based thermoplastic elastomer, 0.3 parts of antioxidant as raw material, melt blending in internal mixer, get polypropylene-based insulation material. The melt blending process is: temperature is 180℃, time is 5 minutes, speed is 80r / min.

[0086] Comparative Example 1

[0087] Take 80 parts of polypropylene alloy resin, 20 parts of styrene-based thermoplastic elastomer, 0.2 parts of antioxidant as raw material, melt blending in internal mixer, get polypropylene-based insulation material. The melt blending process is: temperature is 180℃, time is 5 minutes, speed is 80r / min.

[0088] Comparative Example 2

[0089] Take 50 parts of polypropylene alloy resin, 50 parts of styrene-based thermoplastic elastomer, 0.3 parts of antioxidant as raw material, melt blending in internal mixer, get polypropylene-based insulation material. The melt blending process is: temperature is 180℃, time is 8 minutes, speed is 120r / min.

[0090] Comparative Example 3

[0091] Take 20 parts of polypropylene alloy resin, 80 parts of styrene-based thermoplastic elastomer, 0.5 parts of antioxidant as raw material, melt blending in internal mixer, get polypropylene-based insulation material. The melt blending process is: temperature is 180℃, time is 10 minutes, speed is 150r / min.

[0092] Comparative Example 4

[0093] Similar to the preparation process of Example 1, the difference is that the polypropylene alloy resin is 20 parts, the heat-resistant polypropylene is 45 parts, and the styrene-based thermoplastic elastomer is 35 parts.

[0094] Comparative Example 5

[0095] Similar to the preparation process of Example 1, the difference is that the polypropylene alloy resin is 40 parts, the heat-resistant polypropylene is 35 parts, and the styrene-based thermoplastic elastomer is 25 parts.

[0096] Comparative Example 6

[0097] Similar to the preparation process of Example 1, except that the polypropylene kettle alloy resin is 65 parts, the heat-resistant polypropylene is 5 parts, and the styrene-based thermoplastic elastomer is 30 parts.

[0098] Comparative Example 7

[0099] Similar to the preparation process of Example 1, except that the number average molecular weight of the styrene-based thermoplastic elastomer is about 50000 g / mol.

[0100] Comparative Example 8

[0101] Similar to the preparation process of Example 1, except that the melt flow rate of the heat-resistant polypropylene under the same conditions is about 6 g / 10 min.

[0102] Comparative Example 9

[0103] Similar to the preparation process of Example 1, except that the molecular chain tacticity of the heat-resistant polypropylene is about 90%.

[0104] The parameters of some of the raw materials involved in the above examples and comparative examples are shown in Table 1 below.

[0105] Table 1

[0106]

[0107] The polypropylene-based insulation material prepared in the above examples and comparative examples was subjected to relevant performance tests, and the test results are shown in Table 2 below.

[0108] Among them, the test conditions or test standards of each performance test item are as follows:

[0109] (1) Flexural modulus: tested based on GB / T9341-2008.

[0110] (2) Electrical properties: tested based on GB / T 1408.1-2016.

[0111] (3) Heat distortion resistance: to evaluate whether the polypropylene-based insulation material can maintain the necessary mechanical strength at the desired overload temperature, the sample is prepared according to the tensile property test method. The standard test method for heat extension test is used. One end of the sample is suspended in an oven with a temperature setting of 150℃, and the other end is subjected to a load of 0.2 MPa of the weight of the sample cross section. After a set time of 15 min, the elongation of the sample is measured, defined as the elongation under load. The elongation after cooling is defined as the permanent set.

[0112] Table 2

[0113]

[0114] By Figure 1 , Figure 2 and the statistical results of Table 2 can be seen that the polypropylene-based insulation material prepared by Comparative Example 1 exhibits good heat deformation resistance, and the deformation rate and permanent deformation rate under load are only 0.5%. However, the room temperature bending modulus exceeds 500 MPa, which is difficult to meet the mechanical property requirements of polypropylene cables. With the increase of the content of styrene-based thermoplastic elastomer, the bending modulus of Comparative Examples 2 and 3 decreases rapidly, the mechanical toughness is well improved, but the heat resistance is also deteriorated more obviously. Especially, Comparative Example 3 cannot complete the heat resistance test, directly breaks at high temperature, and no exact value is obtained, which shows poor heat deformation resistance.

[0115] By using the combination of heat-resistant polypropylene and styrene-based thermoplastic elastomer, the performance advantages of the two can be coupled, and the heat deformation resistance, mechanical toughness and electrical properties of the polypropylene-based insulation material can be considered. As shown in Table 2, in Examples 1-6, the polypropylene-based insulation material has good heat deformation resistance and mechanical toughness. At the same time, the polypropylene-based insulation material can maintain good electrical properties, and the room temperature AC breakdown field strength (50 Hz, 1 mm) is higher than 30 kV / mm. In Comparative Examples 4-6, the mass content of each component of the polypropylene-based insulation material is not within the protection range, although it exhibits good heat deformation resistance, but the bending modulus is high, which is difficult to meet the use requirements of the cable. In Comparative Examples 7-9, the molecular weight of the styrene-based thermoplastic elastomer is too low, the melt index (melt flow rate) of the heat-resistant polypropylene is too high, and the stereoregularity is too low. Although a lower bending modulus can be obtained, the heat deformation resistance is poor, and it is still difficult to meet the use requirements of the cable. Therefore, by using the combination of various functional modifiers, the heat deformation resistance, electrical properties and mechanical toughness of the polypropylene-based insulation material are synergistically optimized, which can meet the requirements of polypropylene high-voltage cables.

[0116] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0117] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A polypropylene-based insulating material, characterized in that, Including the following raw materials by weight: Polypropylene autoclave alloying resin, 20-50 parts; Heat-resistant polypropylene, 10 to 40 parts; Styrene-based thermoplastic elastomer, 35 to 50 parts; The heat-resistant polypropylene has a molecular chain stereoregularity of ≥96%; The polypropylene in-reactor alloy resin comprises a polypropylene matrix and a rubber phase; the rubber phase comprises an ethylene-propylene random copolymer. The heat-resistant polypropylene has a melt flow rate of 2 g / 10 min to 4 g / 10 min at 230 °C and 2.16 kg. The styrene-based thermoplastic elastomer includes a styrene / ethylene-propylene block copolymer; the number-average molecular weight of the styrene / ethylene-propylene block copolymer is 60,000 g / mol to 150,000 g / mol.

2. The polypropylene-based insulating material according to claim 1, characterized in that, The particle size of the rubber phase is 0.2 μm to 1 μm.

3. The polypropylene-based insulating material according to claim 1 or 2, characterized in that, The rubber phase accounts for 25% to 28% of the mass of the alloy resin in the polypropylene reactor.

4. The polypropylene-based insulating material according to claim 1 or 2, characterized in that, At least one of the following conditions must be met: (1) The styrene in the styrene-based thermoplastic elastomer accounts for 20% to 35% by mass; (2) In the styrene-based thermoplastic elastomer, the number of moles of ethylene is equal to the number of moles of propylene.

5. The polypropylene-based insulating material according to claim 1 or 2, characterized in that, It also includes the following raw materials by weight: antioxidant, 0.2 to 0.5 parts.

6. A method for preparing the polypropylene-based insulating material according to any one of claims 1-5, characterized in that, include: The raw materials are subjected to melt blending to prepare the polypropylene-based insulating material.

7. The method according to claim 6, characterized in that, The melt blending process satisfies at least one of the following conditions: (1) The temperature of the melt blending treatment is 180℃~220℃; (2) The melt blending treatment time is 5 min to 10 min; (3) The rotation speed in the melt blending process is 80 r / min to 150 r / min.

8. The method according to claim 6 or 7, characterized in that, In the melt blending process, the blending method includes either internal mixing or extrusion.

9. The use of a polypropylene-based insulating material according to any one of claims 1-5 or a polypropylene-based insulating material prepared according to any one of claims 6-8 in the manufacture of cable products.

10. A cable product, characterized in that, Includes the polypropylene-based insulating material according to any one of claims 1-5 or the polypropylene-based insulating material prepared by the method according to any one of claims 6-8.

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