High-strength ethylene-propylene insulating material as well as preparation method and application thereof

Abstract

The invention provides a high-strength ethylene-propylene insulating material and a preparation method and application thereof, and belongs to the technical field of cable materials, and the high-strength ethylene-propylene insulating material comprises the following components in parts by mass: 100 parts of ethylene propylene rubber, 4-8 parts of a processing aid, 20-30 parts of a metal oxide, 60-100 parts of superfine modified aluminum silicate, 8-15 parts of a softening aid, 5-8 parts of a vulcanizing aid and 2-4 parts of an anti-aging aid. According to the preparation method, an existing shuttle car cable ethylene-propylene insulation formula is improved, superfine modified aluminum silicate is introduced into the ethylene-propylene insulation formula, the selection and proportion of all the raw materials are optimized, the tensile strength of the ethylene-propylene insulation material is improved, meanwhile, the high elongation at break is kept, and the service life of the shuttle car cable is prolonged. Therefore, the tensile property, the bending resistance, the winding resistance, the extrusion resistance and the like of the cable are improved, the mechanical strength and the flexibility of the shuttle car cable are improved, and the service life of the shuttle car cable is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of cable materials, and in particular to a high-strength ethylene-propylene insulating material and a preparation method and application thereof. Background Art

[0002] The shuttle car is a coal transport car that moves back and forth between the coal mining face and the conveyor belt in a coal mine. One end of the shuttle car cable is connected to the shuttle car, and the other end is connected to the power supply. As the shuttle car moves, the shuttle car cable is always in a cyclical motion state of being wound and straightened. The shuttle car cable may be scratched by the well wall or hit by coal blocks, and is often crushed. For these reasons, the shuttle car cable is very easy to be damaged and cause shutdown.

[0003] Patents with application numbers 201320269066.1 and 201510479989.3 both disclose the structure of shuttle cables, but the patents both increase the flexibility and tensile strength of the cables by adding a reinforcing core inside the shuttle cables. In order to increase the service life of the shuttle cables, in addition to changing the cable structure composition, material composition, and process improvements of the shuttle cables in the prior art, increasing the tensile strength of the existing cable insulation and sheath is also one of the methods to increase the service life of the shuttle cables. The prior art method to increase the insulation strength of EPDM is to use EPDM materials with high ethylene content or to use white carbon black for reinforcement. The hardness of EPDM insulation increases and the elongation decreases, resulting in an increase in the hardness of the finished cable insulation, which is easy to break; the increase in the hardness of EPDM insulation also makes it difficult to extrude the insulation, which is easy to cause scorching and extrusion of cooked glue. Summary of the invention

[0004] In view of the technical problems existing in the background technology, the present application provides a high-strength EPDM insulation material and its preparation method and application, aiming to solve the technical problem that the tensile strength and softness of the insulation material on the surface of the shuttle cable cannot be satisfied at the same time.

[0005] In a first aspect, an embodiment of the present application provides a high-strength ethylene-propylene insulation material, which comprises the following components by weight: 100 parts of ethylene propylene rubber; 4-8 parts of processing aids; 20-30 parts of metal oxide; 60-100 parts of ultrafine modified aluminum silicate, The ultrafine modified aluminum silicate is ultrafine aluminum silicate modified by a silane coupling agent; 8-15 parts of softening aid; 5-8 parts of vulcanization accelerator; 2-4 parts of anti-aging agent.

[0006] Preferably, the particle size of the ultrafine modified aluminum silicate is -2 μm ≥ 80%.

[0007] In the technical scheme of the embodiment of the present application, ultrafine modified aluminum silicate is used as a reinforcing auxiliary agent to play a reinforcing role and maintain a high volume resistivity of the formula to ensure the insulation of the EPDM insulation material; the ultrafine aluminum silicate is ultrafine aluminum silicate modified by a silane coupling agent, and the silane coupling agent is used for in-situ surface chemical modification, that is, a silane coupling agent surface modifier is added during the preparation of the ultrafine aluminum silicate powder, and the surface is organically modified while the ultrafine aluminum silicate is formed. Since the silane coupling agent is adsorbed on the surface of the newly generated particles, the growth of the particles is affected, the surface tension of the particles is reduced, and the agglomeration between the particles is weakened, the apparent particle size of the aluminum silicate can be effectively reduced, so that the aluminum silicate obtains a high specific surface area, so that it can be better dispersed in the EPDM. In rubber; ultrafine aluminum silicate is subjected to in-situ surface chemical modification by silane coupling agent, and the crystal form of ultrafine aluminum silicate powder is changed at the same time. Before ultrafine aluminum silicate modification, the powder is a mesh porous structure, which can absorb a large number of water molecules. After surface modification, some water molecules are replaced by silane coupling agent, and the hydrolysis functional groups in silane coupling agent form Si-OH after hydrolysis. These Si-OH groups can condense with the hydroxyl groups on the surface of ultrafine aluminum silicate to form stable chemical bonds, so that ultrafine aluminum silicate changes from metastable state to stable state, thereby enhancing the thermal stability of modified ultrafine aluminum silicate; and ultrafine aluminum silicate modified by silane coupling agent is easily wetted by rubber during mixing, exerting a good reinforcement effect, and improving vulcanization efficiency.

[0008] Preferably, the EPDM rubber is Dow 4725P.

[0009] In the technical solution of the embodiment of the present application, Dow 4725P is a low-viscosity, high-strength EPDM rubber, which is the basis of the high-strength EPDM insulation material in the present application.

[0010] Preferably, the processing aid includes one or more of stearic acid, microcrystalline paraffin, and paraffin.

[0011] In the technical solution of the embodiment of the present application, the main function of stearic acid, microcrystalline paraffin or paraffin is to facilitate the mixing and extrusion of the rubber material of the present application.

[0012] Preferably, the metal oxide includes one or more of zinc oxide, antimony trioxide, and titanium dioxide.

[0013] In the technical solution of the embodiment of the present application, the metal oxide can play an activation role and at the same time improve the heat resistance level of the EPDM insulating rubber.

[0014] Preferably, the softening aid is paraffin oil, and the flash point of the paraffin oil is 283-320°C.

[0015] In the technical solution of the embodiment of the present application, high flash point paraffin oil is used to ensure the heat resistance of EPDM insulating rubber.

[0016] Preferably, the vulcanization aid includes dicumyl peroxide (DCP) and triallyl isocyanurate (TAIC), and the mass ratio of DCP to TAIC is (3-3.6): (3-4).

[0017] Preferably, the anti-aging agent includes 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD) and N,N-di-n-butyldithiocarbamate nickel (NBC), and the mass ratio of RD to NBC is (0.5~2):1.

[0018] In a second aspect, the present application provides a method for preparing a high-strength EPDM insulation material, comprising the following steps: S1. Mix EPDM rubber, processing aid, metal oxide, ultrafine modified aluminum silicate, softening aid and anti-aging aid for 6-8 min, and discharge at 130-140℃; S2, after cooling to 60~80℃, filter, roll and place for not less than 48h, mix with vulcanization accelerator, mix for 4~6 min, and discharge at 110℃; S3. After cooling, place it for no less than 48 hours before extruding it to form EPDM insulation material.

[0019] In a third aspect, an embodiment of the present application provides an application of a high-strength EPDM insulation material for preparing shuttle cables.

[0020] Different from the existing technical solutions, the beneficial effects of this application include: The present application improves the existing EPDM insulation formula of shuttle cables, introduces ultrafine modified aluminum silicate into the EPDM insulation formula, and optimizes the selection and ratio of each raw material, thereby improving the tensile strength of the EPDM insulation material while maintaining a high elongation at break, thereby improving the cable's tensile resistance, bending resistance, winding resistance, extrusion resistance and other properties, improving the mechanical strength and flexibility of the shuttle cable, and extending the service life of the shuttle cable.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. DETAILED DESCRIPTION

[0022] The following is a detailed description of the embodiments of the technical solution of the present application. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above description and any variations thereof are intended to cover non-exclusive inclusions.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0026] The existing method for improving the insulation strength of EPDM is to use EPDM materials with high ethylene content or to use white carbon black for reinforcement. The hardness of EPDM insulation increases and the elongation decreases, resulting in an increase in the hardness of the finished cable insulation and easy tearing. The increase in the hardness of EPDM insulation also makes it difficult to extrude the insulation, which easily causes scorching and extrusion of cooked glue.

[0027] In order to solve the technical problem that the tensile strength and softness of the insulating material on the surface of the shuttle cable cannot be satisfied at the same time, the present application provides a high-strength EPDM insulating material and its preparation method and application, wherein the existing EPDM insulation formula of the shuttle cable is improved, ultrafine modified aluminum silicate is introduced into the EPDM insulation formula, and the selection and ratio of each raw material are optimized, thereby improving the tensile strength of the EPDM insulation material while maintaining a high elongation at break, thereby improving the cable's tensile resistance, bending resistance, winding resistance, extrusion resistance and other properties, improving the mechanical strength and softness of the shuttle cable, and extending the service life of the shuttle cable.

[0028] A high-strength ethylene-propylene insulating material, comprising the following components by mass: 100 parts of ethylene propylene rubber; 4-8 parts of processing aids; 20-30 parts of metal oxide; 60-100 parts of ultrafine modified aluminum silicate, The ultrafine modified aluminum silicate is ultrafine aluminum silicate modified by a silane coupling agent; 8-15 parts of softening aid; 5-8 parts of vulcanization accelerator; 2-4 parts of anti-aging agent.

[0029] Preferably, the particle size of the ultrafine modified aluminum silicate is -2 μm ≥ 80%.

[0030] In the technical solution of the embodiment of the present application, ultrafine modified aluminum silicate is used as a reinforcing auxiliary agent to play a reinforcing role and maintain a high volume resistivity of the formula; the ultrafine aluminum silicate is ultrafine aluminum silicate modified by a silane coupling agent, and the silane coupling agent is used for in-situ surface chemical modification, that is, a silane coupling agent surface modifier is added during the preparation of the ultrafine aluminum silicate powder, and the surface is organically modified while the ultrafine aluminum silicate is formed. Since the silane coupling agent is adsorbed on the surface of the newly generated particles, the growth of the particles is affected, the surface tension of the particles is reduced, and the agglomeration between the particles is weakened, which can effectively reduce the apparent particle size of the aluminum silicate, so that the aluminum silicate obtains a high specific surface area, so that it can be better dispersed in EPDM rubber; ultrafine silicon The in-situ surface chemical modification of aluminum silicate by silane coupling agent also changes the crystal form of ultrafine aluminum silicate powder. Before the modification, the ultrafine aluminum silicate powder has a reticular porous structure and can absorb a large amount of water molecules. After the surface modification, some water molecules are replaced by silane coupling agent. The hydrolysis functional groups in the silane coupling agent form Si-OH after hydrolysis. These Si-OH groups can react with the hydroxyl groups on the surface of ultrafine aluminum silicate to form stable chemical bonds, so that the ultrafine aluminum silicate changes from a metastable state to a stable state, thereby enhancing the thermal stability of the modified ultrafine aluminum silicate. The ultrafine aluminum silicate modified by silane coupling agent is easily wetted by the rubber during mixing, exerts a good reinforcement effect, and can also improve the vulcanization efficiency.

[0031] Preferably, the EPDM rubber is Dow 4725P.

[0032] In the technical solution of the embodiment of the present application, Dow 4725P is a low-viscosity, high-strength EPDM rubber, which is the basis of the high-strength EPDM insulation material in the present application.

[0033] Preferably, the processing aid includes one or more of stearic acid, microcrystalline paraffin, and paraffin.

[0034] In the technical solution of the embodiment of the present application, the main function of stearic acid, microcrystalline paraffin or paraffin is to facilitate the mixing and extrusion of the rubber material of the present application.

[0035] Preferably, the metal oxide includes one or more of zinc oxide, antimony trioxide, and titanium dioxide.

[0036] In the technical solution of the embodiment of the present application, the metal oxide can play an activation role and at the same time improve the heat resistance level of the EPDM insulating rubber.

[0037] Preferably, the softening aid is paraffin oil, and the flash point of the paraffin oil is 283-320°C.

[0038] In the technical solution of the embodiment of the present application, high flash point paraffin oil is used to ensure the heat resistance of EPDM insulating rubber.

[0039] Preferably, the vulcanization aid includes dicumyl peroxide (DCP) and triallyl isocyanurate (TAIC), and the mass ratio of DCP to TAIC is (3-3.6): (3-4).

[0040] Preferably, the anti-aging agent includes 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD) and N,N-di-n-butyldithiocarbamate nickel (NBC), and the mass ratio of RD to NBC is (0.5~2):1.

[0041] In a second aspect, the present application provides a method for preparing a high-strength EPDM insulation material, comprising the following steps: S1. Mix EPDM rubber, processing aid, metal oxide, ultrafine modified aluminum silicate, softening aid and anti-aging aid for 6-8 min, and discharge at 130-140℃; S2, after cooling to 60~80℃, filter, roll and place for not less than 48h, mix with vulcanization accelerator, mix for 4~6 min, and discharge at 110℃; S3. After cooling, place it for no less than 48 hours before extruding it to form EPDM insulation material.

[0042] In a third aspect, an embodiment of the present application provides an application of a high-strength EPDM insulation material for preparing shuttle cables.

[0043] Some specific embodiments are listed below. It should be noted that the embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used without specifying the manufacturer are all conventional products that can be obtained commercially.

[0044] 1. Preparation method Example 1 A method for preparing a high-strength ethylene-propylene insulating material comprises the following steps: S1. Add 100 parts of EPDM rubber, 2 parts of stearic acid, 4 parts of microcrystalline wax, 2 parts of paraffin wax, 5 parts of zinc oxide, 8 parts of antimony trioxide, 5 parts of titanium dioxide, 80 parts of ultrafine modified aluminum silicate, 10 parts of high flash point paraffin wax, 2 parts of RD and 1 part of NBC into an internal mixer, mix for 6 minutes by reverse mixing method and discharge at 140°C; S2, after cooling the mill to 60℃, filter, roll and place for 48h, mix with 3 parts of vulcanizing agent DCP and 4 parts of TAIC in an internal mixer, mix for 6 min, and discharge at 110℃; S3. After cooling down and leaving it for 48 hours, it is extruded on a continuous vulcanization production line to form EPDM insulation material.

[0045] Example 2 A method for preparing a high-strength ethylene-propylene insulating material comprises the following steps: S1. Add 100 parts of EPDM rubber, 2 parts of stearic acid, 4 parts of microcrystalline wax, 2 parts of paraffin wax, 5 parts of zinc oxide, 12 parts of antimony trioxide, 5 parts of titanium dioxide, 90 parts of ultrafine modified aluminum silicate, 12 parts of high flash point paraffin wax, 2 parts of RD and 1 part of NBC into an internal mixer, mix for 8 minutes by reverse mixing method, and discharge at 130°C; S2, the open mill is cooled to 80℃ and then filtered, rolled and placed for 48 hours, mixed with 3 parts of vulcanizing agent DCP and 4 parts of TAIC in an internal mixer, mixed for 4 minutes, and discharged at 110℃; S3. After cooling down and leaving it for 48 hours, it is extruded on a continuous vulcanization production line to form EPDM insulation material.

[0046] Example 3 A method for preparing a high-strength ethylene-propylene insulating material comprises the following steps: S1. Add 100 parts of EPDM rubber, 2 parts of stearic acid, 4 parts of microcrystalline wax, 2 parts of paraffin wax, 5 parts of zinc oxide, 12 parts of antimony trioxide, 5 parts of titanium dioxide, 90 parts of ultrafine modified aluminum silicate, 10 parts of high flash point paraffin wax, 1 part of RD and 2 parts of NBC into an internal mixer, mix for 7 minutes by reverse mixing method and discharge at 135°C; S2, the open mill is cooled to 70°C and then filtered, rolled and placed for 48 hours, mixed with 3.6 parts of vulcanizing agent DCP and 3 parts of TAIC in an internal mixer, mixed for 5 minutes, and discharged at 110°C; S3. After cooling down and leaving it for 48 hours, it is extruded on a continuous vulcanization production line to form EPDM insulation material.

[0047] Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that in Comparative Example 1, ultrafine modified aluminum silicate is replaced by ultrafine talc powder, and the other steps are the same.

[0048] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that in Comparative Example 3, ultrafine modified aluminum silicate is replaced by ultrafine aluminum silicate, and the other steps are the same.

[0049] Comparative Example 3 The difference between Comparative Example 3 and Example 2 is that, in step S1, 100 parts of ethylene propylene rubber, 2 parts of stearic acid, 4 parts of microcrystalline wax, 2 parts of paraffin, 5 parts of zinc oxide, 12 parts of antimony trioxide, 5 parts of titanium dioxide, 50 parts of ultrafine modified aluminum silicate, 6 parts of high flash point paraffin, 1 part of RD, and 2 parts of NBC are added to an internal mixer, mixed for 8 minutes by back mixing method, and discharged at 130°C; the other steps are the same.

[0050] Comparative Example 4 The difference between Comparative Example 4 and Example 2 is that, in step S1, 100 parts of ethylene propylene rubber, 2 parts of stearic acid, 4 parts of microcrystalline wax, 2 parts of paraffin, 5 parts of zinc oxide, 12 parts of antimony trioxide, 5 parts of titanium dioxide, 120 parts of ultrafine modified aluminum silicate, 14 parts of high flash point paraffin, 1 part of RD, and 2 parts of NBC are added to an internal mixer, mixed for 8 minutes by back mixing, and discharged at 130°C; the other steps are the same.

[0051] 2. Test Method 1. Mechanical properties test method before aging The finished cable is sampled, a section of insulation is cut off to make a test sample, the test sample is made into a dumbbell piece, the sample thickness is about 1mm, the dumbbell piece thickness is input on the intelligent tensile testing machine, and five dumbbell pieces are tested in a group. The test result takes the middle value of tensile strength and elongation at break.

[0052] 2. Test method for mechanical property change rate before and after aging Sampling of finished cable products, cutting a section of insulation to make a test sample, the test sample is made into a dumbbell piece, the test sample thickness is about 1mm, a group of five dumbbell pieces are formed before and after aging, and the dumbbell pieces after aging are placed in an aging air box at 135℃. After aging for 168h, the thickness of the dumbbell pieces before and after aging are input on the intelligent tensile testing machine, and a group of five dumbbell pieces are tested before and after aging. The test result takes the middle value of tensile strength and elongation at break, (tensile strength before aging - tensile strength before aging / tensile strength before aging) * 100% = tensile strength change rate; (elongation at break before aging - elongation at break before aging / elongation at break before aging) * 100% = elongation at break change rate %.

[0053] 3. Electrical performance test method The insulating EPDM mixed rubber was vulcanized on a flat vulcanizer at 180°C for 5 minutes to make a test piece with a thickness of about 1mm and a diameter of about 110mm. The volume resistivity was tested by a volume resistivity tester at room temperature of 20°C.

[0054] III. Analysis of test results of various embodiments and comparative examples The tensile strength, elongation at break and 20°C volume resistivity of the EPDM insulation materials prepared in Examples 1 to 3 were tested, and then the tensile strength and elongation at break of the aged EPDM insulation materials were tested after aging for 168 hours at 135°C in an air box. The test data are shown in Table 1 below: Table 1 Test data of ethylene-propylene insulation materials prepared in Examples 1 to 3 before and after aging

[0055] The existing technology generally has a tensile strength of EPDM insulation of 6-8 N / mm 2 As can be seen from Table 1, the tensile strength of the EPDM insulation material prepared in Examples 1 to 3 of the present application is between 14 and 16 N / mm 2 , and maintains the softness and high insulation performance of the EPDM insulation material itself, achieves more than double the tensile strength, and maintains a high elongation at break and tensile strength after aging, achieving the goal of prolonging the life of the shuttle cable.

[0056] In Comparative Examples 1 and 2, ultrafine talcum powder and unmodified ultrafine aluminum silicate are used instead of ultrafine modified aluminum silicate to prepare EPDM insulation materials. It can be seen from Table 1 that the tensile strength of the EPDM insulation materials before aging is much lower than that of Example 2, indicating that the ultrafine modified aluminum silicate in the present application is easily wetted by the rubber during mixing after being modified by a silane coupling agent, and exerts a good reinforcement effect; the tensile strength and elongation at break of Comparative Examples 1 and 2 after aging are significantly reduced compared with Example 2, indicating that ultrafine modified aluminum silicate can improve the stability of ultrafine aluminum silicate, thereby making the prepared EPDM insulation rubber more stable; the volume resistance in Comparative Example 1 is also lower than that in Example 2, indicating that the ultrafine modified aluminum silicate can maintain a high volume resistance of the formula.

[0057] The content of ultrafine modified aluminum silicate in Comparative Example 3 is too low, resulting in insufficient tensile strength of the EPDM insulation material; the content of ultrafine modified aluminum silicate in Comparative Example 4 is too high, resulting in a decrease in tensile strength and elongation at break of the EPDM insulation material, and a significant decrease in anti-aging ability, indicating that the optimal addition amount of ultrafine modified aluminum silicate in this application is 60 to 100 parts.

[0058] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A high-strength ethylene-propylene insulation material, characterized in that: Calculated by mass, it includes the following components: 100 parts of ethylene propylene rubber; 4-8 parts of processing aids; 20-30 parts of metal oxide; 60-100 parts of ultrafine modified aluminum silicate, The ultrafine modified aluminum silicate is ultrafine aluminum silicate modified by a silane coupling agent; 8-15 parts of softening aid; 5-8 parts of vulcanization accelerator; 2-4 parts of anti-aging agent.

2. The high-strength EPDM insulation material according to claim 1, characterized in that: The particle size of the ultrafine modified aluminum silicate is -2 μm ≥ 80%.

3. The high-strength EPDM insulation material according to claim 1, characterized in that: The EPDM rubber is Dow 4725P.

4. The high-strength EPDM insulation material according to claim 1, characterized in that: The processing aid includes one or more of stearic acid, microcrystalline paraffin, and paraffin.

5. The high-strength EPDM insulation material according to claim 1, characterized in that: The metal oxide includes one or more of zinc oxide, antimony trioxide and titanium dioxide.

6. The high-strength EPDM insulation material according to claim 1, characterized in that: The softening aid is paraffin oil, and the flash point of the paraffin oil is 283-320°C.

7. The high-strength EPDM insulation material according to claim 1, characterized in that: The vulcanization aid includes DCP and TAIC, and the mass ratio of DCP to TAIC is (3-3.6): (3-4).

8. The high-strength EPDM insulation material according to claim 1, characterized in that: The anti-aging aid includes RD and NBC, and the mass ratio of RD to NBC is (0.5~2):

1.

9. A method for preparing a high-strength ethylene-propylene insulating material according to any one of claims 1 to 8, characterized in that: The steps include: S1. Mix EPDM rubber, processing aid, metal oxide, ultrafine modified aluminum silicate, softening aid and anti-aging aid for 6-8 min, and discharge at 130-140℃; S2, after cooling to 60~80℃, filter, roll and place for not less than 48h, mix with vulcanization accelerator, mix for 4~6 min, and discharge at 110℃; S3. After cooling, place it for no less than 48 hours before extruding it to form EPDM insulation material.

10. An application of the high-strength ethylene-propylene insulating material according to any one of claims 1 to 8, characterized in that: Used for preparing shuttle cables.

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