MPP power pipe material and preparation method thereof

Abstract

The application belongs to the technical field of power pipes, and particularly relates to an MPP power pipe material and a preparation method thereof. The MPP power pipe material comprises the following raw materials in parts by weight: 80-100 parts of polypropylene / diethylphosphinic acid aluminum grafting material, 10-20 parts of SiC / carbon fiber composite material, 1-5 parts of antioxidant, 2-5 parts of heat stabilizer, 0.5-4 parts of compatilizer, and 1-2 parts of lubricant. The MPP power pipe material provided by the application can effectively inhibit the agglomeration of carbon fiber fillers, has good mechanical properties and excellent impact resistance, and has good flame retardance, so that the electric wire and cable can be well protected.

Description

Technical Field

[0001] This invention belongs to the field of power pipe technology, specifically relating to an MPP power pipe material and its preparation method. Background Technology

[0002] MPP power pipes, also known as MPP power cable protection pipes, are made primarily of polypropylene. They are characterized by high temperature resistance and external pressure resistance, making them suitable for high-voltage power transmission cable conduits of 10KV and above. Currently, polypropylene-based power pipes still have shortcomings in impact resistance; therefore, improving the impact resistance of MPP power pipes through filler modification is a relatively effective method.

[0003] Carbon fiber possesses properties such as high temperature resistance, friction resistance, electrical conductivity, thermal conductivity, and corrosion resistance, making it a superior mechanical material to glass fiber as a filler in MPP power pipes. Due to its preferred orientation along the fiber axis in its graphite microcrystalline structure, it exhibits high strength and modulus along the fiber axis. Furthermore, carbon fiber has a low density and high specific strength and modulus, thus effectively improving the strength and extending the service life of the pipe without increasing its weight. However, carbon fiber is difficult to disperse uniformly during its use as a reinforcing filler, and it tends to re-agglomerate after dispersion, which to some extent affects its application in the manufacture of MPP power pipes. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides an MPP power pipe material and its preparation method. This MPP power pipe material can effectively inhibit the agglomeration of carbon fiber filler, has good mechanical properties, excellent impact resistance, and good flame retardant properties, and can play a good protective role for wires and cables.

[0005] The first aspect of the present invention provides an MPP power pipe material, comprising the following raw materials in parts by weight: 80-100 parts of polypropylene / aluminum diethylphosphinate graft material, 10-20 parts of SiC / carbon fiber composite material, 1-5 parts of antioxidant, 2-5 parts of heat stabilizer, 0.5-4 parts of compatibilizer, and 1-2 parts of lubricant.

[0006] Preparation method of polypropylene / aluminum diethylphosphinate grafted material:

[0007] Diethylphosphonic aluminum was dispersed in anhydrous ethanol to form a dispersion, and then vinyltrimethoxysilane was added. After thorough stirring, washing and drying were performed to obtain silanized diethylphosphonic aluminum.

[0008] Silanized aluminum diethylphosphinate, polypropylene, and an initiator are mixed evenly and then added to a twin-screw extruder for melt grafting. Subsequently, the mixture is extruded and granulated to obtain the polypropylene / aluminum diethylphosphinate grafted material.

[0009] Furthermore, the concentration of the aluminum diethylphosphonate dispersion is 15-20 wt%;

[0010] Furthermore, the amount of vinyltrimethoxysilane added is 3-5% of the mass of aluminum diethylphosphinate;

[0011] Furthermore, the initiator is benzoyl peroxide and / or dicumyl peroxide.

[0012] Furthermore, the mass ratio of silanized aluminum diethylphosphinic acid, polypropylene, and initiator is 1~2:8:0.5~1.

[0013] Furthermore, the processing temperature of the twin-screw extruder is 220~240℃, and the screw speed is 40~60r / min.

[0014] Preparation method of SiC / carbon fiber composite material:

[0015] Carbon fibers were dispersed in anhydrous ethanol to form a carbon fiber dispersion, and then γ-aminopropyltriethoxysilane coupling agent was added. The mixture was stirred thoroughly at 70-80°C for 3-5 hours, and then filtered and washed to obtain pretreated carbon fibers.

[0016] Pretreated carbon fibers and nano-SiC particles were added together to a mixed solvent of deionized water and anhydrous ethanol in a 1:1 volume ratio, and stirred thoroughly at 70-80℃ for 6-8 hours to obtain SiC / carbon fiber composite material.

[0017] Furthermore, the concentration of the carbon fiber dispersion is 10-15 wt%;

[0018] Furthermore, the mass ratio of γ-aminopropyltriethoxysilane coupling agent, carbon fiber, nano-SiC particles, and mixed solvent is 1~1.5:10:3:100.

[0019] Furthermore, the antioxidant is at least one of antioxidant 1010, antioxidant 168, antioxidant 1076, and antioxidant 626.

[0020] Furthermore, the heat stabilizer is at least one of calcium-zinc composite stabilizers, stearate stabilizers, and organotin stabilizers.

[0021] Furthermore, the compatibilizer is one or more combinations of maleic anhydride-grafted polypropylene, maleic anhydride-grafted ABS, and maleic anhydride-grafted polyethylene.

[0022] Furthermore, the lubricant is at least one of paraffin wax, stearic acid alcohol, and stearamide.

[0023] The second aspect of the present invention provides a method for preparing the above-mentioned MPP power pipe material, wherein polypropylene / aluminum diethylphosphinate graft material, SiC / carbon fiber composite material, antioxidant, heat stabilizer, compatibilizer and lubricant are mixed evenly in a mixer in proportion to obtain a blend, and then extruded and granulated by a twin-screw extruder, and the MPP power pipe material is obtained after being shaped by a die.

[0024] Furthermore, the process parameters of the twin-screw extruder are as follows: zone 1 temperature is 200~220℃, zone 2 temperature is 210~230℃, zone 3 temperature is 220~240℃, zone 4 temperature is 230~250℃, and the extruder screw speed is 80~100r / min.

[0025] The beneficial effects achieved by one or more technical solutions of the present invention are as follows:

[0026] 1. This invention uses carbon fiber as a reinforcing filler and grows SiC around the carbon fiber, which can not only effectively improve the dispersion of carbon fiber, inhibit the agglomeration of carbon fiber, and improve stability, but also work together with carbon fiber to provide an effective mechanical reinforcement substrate for the entire MPP power pipe material system.

[0027] 2. In this invention, the polypropylene resin substrate is grafted with aluminum diethylphosphinate. This is because aluminum diethylphosphinate has good flame retardant properties, and grafting it around the polypropylene can promote better dispersion throughout the system and better exert the flame retardant effect. On the other hand, some of the aluminum around the polypropylene can form a Si-Al-C phase with silicon carbide, which not only strengthens the polypropylene but also promotes the tight bonding between the polypropylene and carbon fibers, further improving the mechanical strength. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to specific embodiments and comparative examples.

[0029] Example 1

[0030] This embodiment provides an MPP power pipe material, comprising the following raw materials in parts by weight: 90 parts polypropylene / aluminum diethylphosphinate grafted material, 15 parts SiC / carbon fiber composite material, 2 parts antioxidant 1010, 3 parts calcium stearate, 1 part maleic anhydride grafted polyethylene, and 1 part paraffin wax.

[0031] Preparation method of polypropylene / aluminum diethylphosphinate grafted material:

[0032] Diethylphosphonic aluminum was dispersed in anhydrous ethanol to form a dispersion with a concentration of 15 wt%. Then, vinyltrimethoxysilane was added at a concentration of 3% of the mass of diethylphosphonic aluminum. After thorough stirring, the mixture was washed and dried to obtain silanized diethylphosphonic aluminum.

[0033] Silanized aluminum diethylphosphinate, polypropylene, and benzoyl peroxide were mixed evenly in a mass ratio of 1:8:0.5, and then added to a twin-screw extruder for melt grafting. The processing temperature of the twin-screw extruder was 220℃ and the screw speed was 50 r / min. Subsequently, extrusion granulation was performed to obtain polypropylene / aluminum diethylphosphinate grafted material.

[0034] Preparation method of SiC / carbon fiber composite material:

[0035] Carbon fibers were dispersed in anhydrous ethanol to form a carbon fiber dispersion with a concentration of 10 wt%. Then, γ-aminopropyltriethoxysilane coupling agent was added, and the mixture was stirred thoroughly at 70°C for 4 hours. After filtration and washing, pretreated carbon fibers were obtained.

[0036] Pretreated carbon fibers and nano-SiC particles were added together to a mixed solvent consisting of deionized water and anhydrous ethanol in a volume ratio of 1:1. The mass ratio of γ-aminopropyltriethoxysilane coupling agent, carbon fibers, nano-SiC particles, and mixed solvent was 1:10:3:100. The mixture was stirred thoroughly at 70°C for 7 hours to obtain a SiC / carbon fiber composite material.

[0037] The preparation method of this MPP power pipe material is as follows:

[0038] Polypropylene / aluminum diethylphosphinate grafted material, SiC / carbon fiber composite material, antioxidant 1010, calcium stearate, maleic anhydride grafted polyethylene, and paraffin wax are mixed evenly in a mixer to obtain a blend. Then, the blend is extruded and granulated through a twin-screw extruder. The process parameters of the twin-screw extruder are: zone 1 temperature 200℃, zone 2 temperature 210℃, zone 3 temperature 220℃, zone 4 temperature 230℃, and the extruder screw speed 80r / min. The material is then shaped by a die to obtain MPP power pipe material.

[0039] Example 2

[0040] This embodiment provides an MPP power pipe material, comprising the following raw materials in parts by weight: 80 parts polypropylene / aluminum diethylphosphinate grafting material, 10 parts SiC / carbon fiber composite material, 1 part antioxidant 168, 2 parts calcium stearate, 0.5 parts maleic anhydride grafted polyethylene, and 1 part paraffin wax.

[0041] Preparation method of polypropylene / aluminum diethylphosphinate grafted material:

[0042] Diethylphosphonic aluminum was dispersed in anhydrous ethanol to form a dispersion with a concentration of 15 wt%. Then, vinyltrimethoxysilane was added at a concentration of 3% of the mass of diethylphosphonic aluminum. After thorough stirring, the mixture was washed and dried to obtain silanized diethylphosphonic aluminum.

[0043] Silanized aluminum diethylphosphinate, polypropylene, and benzoyl peroxide were mixed evenly in a mass ratio of 1:8:1, and then added to a twin-screw extruder for melt grafting. The processing temperature of the twin-screw extruder was 220℃ and the screw speed was 50 r / min. Subsequently, extrusion granulation was performed to obtain polypropylene / aluminum diethylphosphinate grafted material.

[0044] Preparation method of SiC / carbon fiber composite material:

[0045] Carbon fibers were dispersed in anhydrous ethanol to form a carbon fiber dispersion with a concentration of 10 wt%. Then, γ-aminopropyltriethoxysilane coupling agent was added, and the mixture was stirred thoroughly at 80°C for 3 hours. After filtration and washing, pretreated carbon fibers were obtained.

[0046] Pretreated carbon fibers and nano-SiC particles were added together to a mixed solvent consisting of deionized water and anhydrous ethanol in a volume ratio of 1:1. The mass ratio of γ-aminopropyltriethoxysilane coupling agent, carbon fibers, nano-SiC particles, and mixed solvent was 1.5:10:3:100. The mixture was stirred thoroughly at 80°C for 6 hours to obtain a SiC / carbon fiber composite material.

[0047] The preparation method of this MPP power pipe material is as follows:

[0048] Polypropylene / aluminum diethylphosphinate grafted material, SiC / carbon fiber composite material, antioxidant 168, calcium stearate, maleic anhydride grafted polyethylene, and paraffin wax are mixed evenly in a mixer to obtain a blend. Then, the blend is extruded and granulated through a twin-screw extruder. The process parameters of the twin-screw extruder are: zone 1 temperature 220℃, zone 2 temperature 230℃, zone 3 temperature 240℃, zone 4 temperature 250℃, and the extruder screw speed 80r / min. The material is then shaped by a die to obtain MPP power pipe material.

[0049] Example 3

[0050] This embodiment provides an MPP power pipe material, comprising the following raw materials in parts by weight: 80 parts polypropylene / aluminum diethylphosphinic acid grafted material, 20 parts SiC / carbon fiber composite material, 5 parts antioxidant 168, 5 parts zinc stearate, 4 parts maleic anhydride grafted polyethylene, and 2 parts paraffin wax.

[0051] Preparation method of polypropylene / aluminum diethylphosphinate grafted material:

[0052] Diethylphosphonic aluminum was dispersed in anhydrous ethanol to form a dispersion with a concentration of 20 wt%. Then, vinyltrimethoxysilane was added at a concentration of 5% of the mass of diethylphosphonic aluminum. After thorough stirring, the mixture was washed and dried to obtain silanized diethylphosphonic aluminum.

[0053] Silanized aluminum diethylphosphinate, polypropylene, and dicumyl peroxide were mixed evenly in a mass ratio of 1:8:1, and then added to a twin-screw extruder for melt grafting. The processing temperature of the twin-screw extruder was 240℃ and the screw speed was 60 r / min. Subsequently, extrusion granulation was performed to obtain polypropylene / aluminum diethylphosphinate grafted material.

[0054] Preparation method of SiC / carbon fiber composite material:

[0055] Carbon fibers were dispersed in anhydrous ethanol to form a carbon fiber dispersion with a concentration of 15 wt%. Then, γ-aminopropyltriethoxysilane coupling agent was added, and the mixture was stirred thoroughly at 80°C for 3 hours. After filtration and washing, pretreated carbon fibers were obtained.

[0056] Pretreated carbon fibers and nano-SiC particles were added together to a mixed solvent consisting of deionized water and anhydrous ethanol in a volume ratio of 1:1. The mass ratio of γ-aminopropyltriethoxysilane coupling agent, carbon fibers, nano-SiC particles, and mixed solvent was 1:10:3:100. The mixture was stirred thoroughly at 80°C for 6 hours to obtain a SiC / carbon fiber composite material.

[0057] The preparation method of this MPP power pipe material is as follows:

[0058] Polypropylene / aluminum diethylphosphinate grafted material, SiC / carbon fiber composite material, antioxidant 168, zinc stearate, maleic anhydride grafted polyethylene, and paraffin wax are mixed evenly in a mixer to obtain a blend. Then, the blend is extruded and granulated through a twin-screw extruder. The process parameters of the twin-screw extruder are: zone 1 temperature 210℃, zone 2 temperature 220℃, zone 3 temperature 230℃, zone 4 temperature 240℃, and the extruder screw speed 100r / min. The material is then shaped by a die to obtain MPP power pipe material.

[0059] Example 4

[0060] This embodiment provides an MPP power pipe material, comprising the following raw materials in parts by weight: 100 parts polypropylene / aluminum diethylphosphinate grafted material, 15 parts SiC / carbon fiber composite material, 3 parts antioxidant 168, 4 parts calcium-zinc composite stabilizer, 2 parts maleic anhydride grafted polyethylene, and 2 parts paraffin wax.

[0061] Preparation method of polypropylene / aluminum diethylphosphinate grafted material:

[0062] Diethylphosphonic aluminum was dispersed in anhydrous ethanol to form a dispersion with a concentration of 20 wt%. Then, vinyltrimethoxysilane was added at a concentration of 3% of the mass of diethylphosphonic aluminum. After thorough stirring, the mixture was washed and dried to obtain silanized diethylphosphonic aluminum.

[0063] Silanized aluminum diethylphosphinate, polypropylene, and benzoyl peroxide were mixed evenly in a mass ratio of 2:8:1, and then added to a twin-screw extruder for melt grafting. The processing temperature of the twin-screw extruder was 230℃ and the screw speed was 40 r / min. Subsequently, extrusion granulation was performed to obtain polypropylene / aluminum diethylphosphinate grafted material.

[0064] Preparation method of SiC / carbon fiber composite material:

[0065] Carbon fibers were dispersed in anhydrous ethanol to form a carbon fiber dispersion with a concentration of 15 wt%. Then, γ-aminopropyltriethoxysilane coupling agent was added, and the mixture was stirred thoroughly at 80°C for 5 h. After filtration and washing, pretreated carbon fibers were obtained.

[0066] Pretreated carbon fibers and nano-SiC particles were added together to a mixed solvent consisting of deionized water and anhydrous ethanol in a volume ratio of 1:1. The mass ratio of γ-aminopropyltriethoxysilane coupling agent, carbon fibers, nano-SiC particles, and mixed solvent was 1.5:10:3:100. The mixture was stirred thoroughly at 80°C for 8 hours to obtain a SiC / carbon fiber composite material.

[0067] The preparation method of this MPP power pipe material is as follows:

[0068] Polypropylene / aluminum diethyl phosphonate grafted material, SiC / carbon fiber composite material, antioxidant 168, calcium-zinc composite stabilizer, maleic anhydride grafted polyethylene, and paraffin wax are mixed evenly in a mixer to obtain a blend. Then, the blend is extruded and granulated through a twin-screw extruder. The process parameters of the twin-screw extruder are: zone 1 temperature 200℃, zone 2 temperature 210℃, zone 3 temperature 220℃, zone 4 temperature 230℃, and the extruder screw speed 100r / min. The material is then shaped by a die to obtain MPP power pipe material.

[0069] Comparative Example 1

[0070] This comparative example provides an MPP power pipe material comprising the following raw materials in parts by weight: 90 parts polypropylene, 15 parts SiC / carbon fiber composite material, 2 parts antioxidant 1010, 3 parts calcium stearate, 1 part maleic anhydride grafted polyethylene, and 1 part paraffin wax.

[0071] Preparation method of SiC / carbon fiber composite material:

[0072] Carbon fibers were dispersed in anhydrous ethanol to form a carbon fiber dispersion with a concentration of 10 wt%. Then, γ-aminopropyltriethoxysilane coupling agent was added, and the mixture was stirred thoroughly at 70°C for 4 hours. After filtration and washing, pretreated carbon fibers were obtained.

[0073] Pretreated carbon fibers and nano-SiC particles were added together to a mixed solvent consisting of deionized water and anhydrous ethanol in a volume ratio of 1:1. The mass ratio of γ-aminopropyltriethoxysilane coupling agent, carbon fibers, nano-SiC particles, and mixed solvent was 1:10:3:100. The mixture was stirred thoroughly at 70°C for 7 hours to obtain a SiC / carbon fiber composite material.

[0074] The preparation method of this MPP power pipe material is as follows:

[0075] Polypropylene, SiC / carbon fiber composite material, antioxidant 1010, calcium stearate, maleic anhydride grafted polyethylene, and paraffin are mixed evenly in a mixer to obtain a blend. The blend is then extruded and granulated using a twin-screw extruder. The process parameters of the twin-screw extruder are: zone 1 temperature 200℃, zone 2 temperature 210℃, zone 3 temperature 220℃, zone 4 temperature 230℃, and extruder screw speed 80r / min. The material is then shaped by a die to obtain MPP power pipe material.

[0076] Comparative Example 2

[0077] This comparative example provides an MPP power pipe material comprising the following raw materials in parts by weight: 90 parts polypropylene / aluminum diethylphosphinate grafted material, 10 parts carbon fiber, 5 parts nano-SiC particles, 2 parts antioxidant 1010, 3 parts calcium stearate, 1 part maleic anhydride grafted polyethylene, and 1 part paraffin wax.

[0078] Preparation method of polypropylene / aluminum diethylphosphinate grafted material:

[0079] Diethylphosphonic aluminum was dispersed in anhydrous ethanol to form a dispersion with a concentration of 15 wt%. Then, vinyltrimethoxysilane was added at a concentration of 3% of the mass of diethylphosphonic aluminum. After thorough stirring, the mixture was washed and dried to obtain silanized diethylphosphonic aluminum.

[0080] Silanized aluminum diethylphosphinate, polypropylene, and benzoyl peroxide were mixed evenly in a mass ratio of 1:8:0.5, and then added to a twin-screw extruder for melt grafting. The processing temperature of the twin-screw extruder was 220℃ and the screw speed was 50 r / min. Subsequently, extrusion granulation was performed to obtain polypropylene / aluminum diethylphosphinate grafted material.

[0081] The preparation method of this MPP power pipe material is as follows:

[0082] Polypropylene / aluminum diethyl phosphonate grafted material, carbon fiber, nano SiC particles, antioxidant 1010, calcium stearate, maleic anhydride grafted polyethylene, and paraffin wax are mixed evenly in a mixer to obtain a blend. Then, the blend is extruded and granulated through a twin-screw extruder. The process parameters of the twin-screw extruder are: zone 1 temperature 200℃, zone 2 temperature 210℃, zone 3 temperature 220℃, zone 4 temperature 230℃, and the extruder screw speed 80r / min. The material is then shaped by a die to obtain MPP power pipe material.

[0083] Comparative Example 3

[0084] This comparative example provides an MPP power pipe material comprising the following raw materials in parts by weight: 90 parts polypropylene, 15 parts SiC / carbon fiber composite material, 2 parts aluminum diethylphosphinate, 2 parts antioxidant 1010, 3 parts calcium stearate, 1 part maleic anhydride grafted polyethylene, and 1 part paraffin wax.

[0085] Preparation method of SiC / carbon fiber composite material:

[0086] Carbon fibers were dispersed in anhydrous ethanol to form a carbon fiber dispersion with a concentration of 10 wt%. Then, γ-aminopropyltriethoxysilane coupling agent was added, and the mixture was stirred thoroughly at 70°C for 4 hours. After filtration and washing, pretreated carbon fibers were obtained.

[0087] Pretreated carbon fibers and nano-SiC particles were added together to a mixed solvent consisting of deionized water and anhydrous ethanol in a volume ratio of 1:1. The mass ratio of γ-aminopropyltriethoxysilane coupling agent, carbon fibers, nano-SiC particles, and mixed solvent was 1:10:3:100. The mixture was stirred thoroughly at 70°C for 7 hours to obtain a SiC / carbon fiber composite material.

[0088] The preparation method of this MPP power pipe material is as follows:

[0089] Polypropylene, SiC / carbon fiber composite material, aluminum diethylphosphinate, antioxidant 1010, calcium stearate, maleic anhydride grafted polyethylene, and paraffin wax are mixed evenly in a mixer to obtain a blend. The blend is then extruded and granulated using a twin-screw extruder. The process parameters of the twin-screw extruder are: zone 1 temperature 200℃, zone 2 temperature 210℃, zone 3 temperature 220℃, zone 4 temperature 230℃, and extruder screw speed 80r / min. The material is then shaped by a die to obtain MPP power pipe material.

[0090] Performance testing:

[0091] The MPP power pipes prepared in Examples 1-4 and Comparative Examples 1-3 were subjected to tensile strength tests according to standard GB / T1040-2006, bending strength tests according to standard GB / T9341-2008, impact strength tests according to standard GB / T1043.1-2008, and ring stiffness tests (3%) according to DL / T 802.1. A vertical burning test was also conducted with reference to the UL-94 flame retardancy rating standard to determine the flame retardant performance of the MPP power pipes. The results are shown in Table 1.

[0092] Table 1

[0093]

[0094] According to the test results in Table 1, the MPP power pipe prepared by this invention has good mechanical properties, with high tensile strength, bending strength, impact strength, and ring stiffness. It also has good flame retardant properties and can play a good protective role for wires and cables.

Claims

1. A material for MPP electrical power conduit, characterized by: The raw materials include the following weight parts: 80~100 parts of polypropylene / diethylaluminum phosphinate grafting material, 10~20 parts of SiC / carbon fiber composite material, 1~5 parts of antioxidant, 2~5 parts of heat stabilizer, 0.5~4 parts of compatibilizer, and 1~2 parts of lubricant; The preparation method of the polypropylene / diethylaluminum phosphinate grafting material comprises the following steps: The diethylaluminum phosphinate is dispersed in anhydrous ethanol to form a dispersion liquid, then vinyltrimethoxysilane is added, and after sufficient stirring, the silanized diethylaluminum phosphinate is obtained by washing and drying; The silanized diethylaluminum phosphinate, polypropylene and initiator are uniformly mixed, then are added into a twin-screw extruder for melt grafting, and then are extruded and granulated to obtain the polypropylene / diethylaluminum phosphinate grafting material; The preparation method of the SiC / carbon fiber composite material comprises the following steps: The carbon fiber is dispersed in anhydrous ethanol to form a carbon fiber dispersion liquid, then γ-aminopropyl triethoxysilane coupling agent is added, and after sufficient stirring at 70~80℃ for 3~5h, the pretreated carbon fiber is obtained by filtering and washing; The pretreated carbon fiber and nano-SiC particles are added into a mixed solvent composed of deionized water and anhydrous ethanol in a volume ratio of 1:1, and after sufficient stirring at 70~80℃ for 6~8h, the SiC / carbon fiber composite material is obtained.

2. The MPP electrical conduit material of claim 1, wherein: The concentration of the diethylaluminum phosphinate dispersion liquid is 15~20wt%; The addition amount of the vinyltrimethoxysilane is 3~5% of the mass of the diethylaluminum phosphinate; The mass ratio of the silanized diethylaluminum phosphinate, polypropylene and initiator is 1~2:8:0.5~1; The initiator is benzoyl peroxide and / or dicumyl peroxide.

3. The MPP electrical conduit material of claim 1, wherein: The processing temperature of the twin-screw extruder is 220~240℃, and the screw rotation speed is 40~60r / min.

4. The MPP electrical conduit material of claim 1, wherein: The concentration of the carbon fiber dispersion liquid is 10~15wt%; The mass ratio of the γ-aminopropyl triethoxysilane coupling agent, carbon fiber, nano-SiC particles and mixed solvent is 1~1.5:10:3:

100.

5. The MPP power tube material of claim 1, wherein: The antioxidant is at least one of antioxidant 1010, antioxidant 168, antioxidant 1076 and antioxidant 626.

6. The MPP electrical conduit material of claim 1, wherein: The heat stabilizer is at least one of calcium-zinc composite stabilizer, stearate stabilizer and organic tin stabilizer.

7. The MPP power tube material of claim 1, wherein: The compatibilizer is one or a combination of maleic anhydride grafted polypropylene, maleic anhydride grafted ABS and maleic anhydride grafted polyethylene.

8. The MPP power tube material of claim 1, wherein: The lubricant is at least one of paraffin, stearic acid alcohol and stearic acid amide.

9. A method of making a MPP power tube material according to any one of claims 1 to 8, characterized in that: The polypropylene / diethylaluminum phosphinate grafting material, SiC / carbon fiber composite material, antioxidant, heat stabilizer, compatibilizer and lubricant are uniformly mixed in a proportioning blender to obtain a blended material, and then the blended material is extruded and granulated by a twin-screw extruder to obtain the MPP power pipe material after being shaped by a die.

10. The method for preparing the MPP power pipe material according to claim 9, characterized in that, The process parameters of the twin-screw extruder are as follows: the temperature of the first zone is 200~220℃, the temperature of the second zone is 210~230℃, the temperature of the third zone is 220~240℃, the temperature of the fourth zone is 230~250℃, and the rotation speed of the extruder screw is 80~100r / min.

Images