CN111019243B - Modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material and preparation method thereof - Google Patents

Abstract

The invention discloses a modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat insulating material and a preparation method thereof, wherein the carbon nanotube is weighed and put into a high-temperature furnace, and the high-temperature furnace is vacuumized to be less than or equal to-0.09 MPa; introducing inert gas into the high-temperature furnace until the pressure in the high-temperature furnace is greater than the standard atmospheric pressure, opening a gas outlet of the high-temperature furnace, and keeping the inert gas flowing; heating the high-temperature furnace to 800-1300 ℃; stopping inputting the inert gas, and inputting hydrocarbon carbon source gas into the high-temperature furnace, wherein the flow of the hydrocarbon carbon source gas is 50-600 ml/min; preserving heat in a high-temperature furnace until a modified carbon nano tube is formed; after the carbon nano tube is subjected to vapor deposition pretreatment in the high-temperature tube furnace, the carbon nano tube is coated with a layer of deposited carbon protective layer, so that the structure of the carbon nano tube filler is changed, the thermal conductivity of the heat-insulating material and the generated carbonized layer is reduced, and the carbonization ablation rate of the heat-insulating material is also obviously reduced.

Description

Modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material and preparation method thereof

[ technical field ] A method for producing a semiconductor device

The invention belongs to the technical field of ablation-resistant aerospace materials, and particularly relates to a modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material and a preparation method thereof.

[ background of the invention ]

The Ethylene Propylene Diene Monomer (EPDM) heat-insulating material mainly takes EPDM rubber as a matrix, is doped with fillers such as phenolic aldehyde, fibers, inorganic fillers and the like, has the characteristics of low density, aging resistance, ablation resistance, good heat-insulating property and beneficial mechanical property, and is widely applied as the heat-insulating material in the solid rocket engine.

During the ablation process of the EPDM thermal insulation material, a charring layer is generated on the surface of the EPDM thermal insulation material, the charring layer is an important barrier for resisting the ablation of high-temperature fuel gas and particle erosion in a combustion chamber of the thermal insulation material, and the ablation resistance of the thermal insulation material can be directly improved by improving the strength of the charring layer.

With scientific development, the new solid rocket engine attaches more importance to high speed, high maneuverability and high reliability, and the anti-ablation performance of the existing EPDM thermal insulation material can not meet the requirements of the current solid rocket engine.

[ summary of the invention ]

The invention aims to provide a modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material and a preparation method thereof, so as to improve the ablation resistance of the EPDM heat-insulating material.

The invention adopts the following technical scheme: a preparation method of modified carbon nanotubes comprises the following steps:

weighing carbon nanotubes, putting the carbon nanotubes into a high-temperature furnace, introducing inert gas into the high-temperature furnace until the pressure in the high-temperature furnace is greater than the standard atmospheric pressure and the purity of the inert gas in the high-temperature furnace is greater than or equal to 98%, opening a gas outlet of the high-temperature furnace, and keeping the inert gas in circulation;

heating the high-temperature furnace to 800-1300 ℃;

stopping inputting the inert gas, and inputting hydrocarbon carbon source gas into the high-temperature furnace, wherein the flow of the hydrocarbon carbon source gas is 50-600 ml/min;

and (4) preserving the heat of the high-temperature furnace until the modified carbon nano tube is formed.

Further, the carbon nanotube has an inner diameter of 0.8 to 5nm, an outer diameter of 0.9 to 15nm, and a length of 1 to 20 μm.

Further, the hydrocarbon carbon source gas is at least one of methane, ethane, acetylene, propane, and propylene.

The other technical scheme of the invention is as follows: the modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material is composed of the following raw materials in parts by weight:

100 parts of ethylene propylene diene monomer;

5-15 parts of aramid fiber;

10-30 parts of phenolic resin;

10-30 parts of fumed silica powder;

5-15 parts of zinc borate;

1-15 parts of modified carbon nanotubes;

5-15 parts of paraffin oil;

0.5-2 parts of sulfur; and

2-5 parts of DCP.

Further, the modified carbon nanotube is prepared by any one of the above preparation methods of the modified carbon nanotube.

The other technical scheme of the invention is as follows: the preparation method of the modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material comprises the following steps:

weighing 100 parts by weight of ethylene propylene diene monomer, and preparing an ethylene propylene diene monomer matrix;

weighing 5-15 parts by weight of aramid fiber, adding the aramid fiber into an ethylene propylene diene monomer matrix, and mixing until the aramid fiber and the ethylene propylene diene monomer matrix are uniformly mixed to obtain a first matrix;

weighing 10-30 parts by weight of phenolic resin, adding into the first matrix, and mixing until the mixture is uniform to obtain a second matrix;

weighing 10-30 parts by weight of fumed silica powder, 5-15 parts by weight of paraffin oil and 5-15 parts by weight of zinc borate, adding into the second matrix, and mixing until uniform mixing is achieved to obtain a third matrix;

weighing 1-15 parts by weight of modified carbon nanotubes, adding the modified carbon nanotubes into a third matrix, and mixing until the mixture is uniformly mixed to obtain a fourth matrix;

weighing sulfur and DCP, adding the sulfur and DCP into a fourth matrix, and mixing until the sulfur and DCP are uniformly mixed to obtain a fifth matrix;

and vulcanizing the fifth matrix at the temperature of 140-160 ℃ for 20-60 min to obtain the modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material.

The invention has the beneficial effects that: after the carbon nano tube is subjected to vapor deposition pretreatment in the high-temperature tube furnace, the carbon nano tube is coated with a layer of deposited carbon protective layer, so that the surface structure of the carbon nano tube filler is changed, the thermal conductivity of the carbon nano tube filler is reduced, the thermal conductivity of the heat-insulating material and the generated carbonized layer is reduced, and the carbonization ablation rate of the heat-insulating material is also obviously reduced.

[ description of the drawings ]

FIG. 1 is a prior art raw carbon nanotube microtopography as used in the examples of the present application;

FIG. 2 is a micro-topography of chemically deposited coated carbon nanotubes in an example of the present application.

[ detailed description ] embodiments

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The embodiment of the application provides a preparation method of a modified carbon nanotube, which comprises the following steps:

weighing the carbon nano tube, putting the carbon nano tube into a high-temperature furnace, and vacuumizing the high-temperature furnace to be less than or equal to-0.09 MPa. In this embodiment, the carbon nanotube has an inner diameter of 0.8-5 nm, an outer diameter of 0.9-15 nm, and a length of 1-20 μm. Preferably, the carbon nano tube is a multi-wall carbon nano tube, the inner diameter of the multi-wall carbon nano tube is 3-5 nm, the outer diameter of the multi-wall carbon nano tube is 8-15 nm, the length of the multi-wall carbon nano tube is 3-12 mu m, the number of layers of the tube wall is 8-15, and the length-diameter ratio of the multi-wall carbon nano tube is 230-930.

And introducing inert gas into the high-temperature furnace until the pressure in the high-temperature furnace is greater than the standard atmospheric pressure and the purity of the inert gas in the high-temperature furnace is greater than or equal to 98%, and opening a gas outlet of the high-temperature furnace to keep the inert gas in circulation.

Heating the high-temperature furnace to 800-1300 ℃; the specific temperature depends on the deposition reaction temperature of the hydrocarbon gas used.

And stopping inputting the inert gas, and inputting hydrocarbon carbon source gas into the high-temperature furnace, wherein the gas flow rate of the hydrocarbon carbon source is 50-600 ml/min in order to ensure that the hydrocarbon carbon source gas is sufficient. In an embodiment of the present application, the hydrocarbon carbon source gas may be at least one of methane, ethane, acetylene, propane, and propylene.

And (3) keeping the temperature of the high-temperature furnace until the modified carbon nano tube is formed, wherein the heat preservation time can be set according to the diameter of the modified carbon nano tube to be prepared, and continuously inputting hydrocarbon carbon source gas into the high-temperature furnace during heat preservation.

And when the modified carbon nano tube is taken out, stopping inputting the hydrocarbon carbon source gas, and inputting the inert gas into the high-temperature furnace to naturally cool the modified carbon nano tube to the room temperature.

As shown in fig. 1 and fig. 2, in the method of this embodiment, the carbon nanotube is subjected to a vapor deposition pretreatment in a high temperature tube furnace to obtain a modified carbon nanotube coated with a deposited carbon protective layer, and as can be seen from microscopic observation of the carbon nanotube and the modified carbon nanotube by a scanning electron microscope, the diameter of the carbon nanotube before coating is 0.8 to 15nm, and the diameter of the modified carbon nanotube is 50 to 65 nm.

Another embodiment of the present application provides a modified carbon nanotube reinforced ethylene propylene diene monomer rubber thermal insulation material, which is composed of the following raw materials in parts by weight:

100 parts of ethylene propylene diene monomer, 5-15 parts of aramid fiber, 10-30 parts of phenolic resin, 10-30 parts of fumed silica powder, 5-15 parts of zinc borate, 1-15 parts of modified carbon nanotube, 5-15 parts of paraffin oil, 0.5-2 parts of sulfur and 2-5 parts of DCP.

In this embodiment, in order to obtain a better thermal insulation material, the aramid fiber is 3mm chopped fiber, and is under the trademark Kevlar.

As a specific implementation manner, in this embodiment, the modified carbon nanotube is prepared by using one of the preparation methods of the modified carbon nanotube in the above embodiments.

Example 1:

the application further provides a modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material which is prepared from the following raw materials in parts by weight:

100 parts of ethylene propylene diene monomer, 10 parts of aramid fiber, 20 parts of phenolic resin, 20 parts of fumed silica, 10 parts of zinc borate, 10 parts of pre-coated carbon nano tubes, 10 parts of paraffin oil, 1.5 parts of sulfur and 4.5 parts of DCP. With the heat insulating material composition in this embodiment, the heat insulating effect is the best, and the charring ablation rate is the lowest.

Another embodiment of the present application provides a method for preparing a modified carbon nanotube reinforced ethylene propylene diene monomer rubber insulation material, including the steps of:

weighing 100 parts by weight of ethylene propylene diene monomer, and preparing an ethylene propylene diene monomer matrix; weighing 5-15 parts by weight of aramid fiber, adding the aramid fiber into an ethylene propylene diene monomer matrix, and mixing until the aramid fiber and the ethylene propylene diene monomer matrix are uniformly mixed to obtain a first matrix. And weighing 10-30 parts by weight of phenolic resin, adding the phenolic resin into the first matrix, and mixing until the phenolic resin and the first matrix are uniformly mixed to obtain a second matrix. Weighing 10-30 parts by weight of fumed silica powder, 5-15 parts by weight of paraffin oil and 5-15 parts by weight of zinc borate, adding into the second matrix, and mixing until uniform mixing is achieved to obtain a third matrix. And weighing 1-15 parts by weight of the modified carbon nanotube, adding the modified carbon nanotube into the third matrix, and mixing until the mixture is uniformly mixed to obtain a fourth matrix. And weighing sulfur and DCP, adding the sulfur and DCP into the fourth matrix, and mixing until the sulfur and DCP are uniformly mixed to obtain a fifth matrix. And vulcanizing the fifth matrix at the temperature of 140-160 ℃ for 20-60 min to obtain the modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material.

It is worth mentioning that the aramid fiber, the phenolic resin, the fumed silica powder, the zinc borate, the modified carbon nanotube, the paraffin oil, the sulfur and the DCP in the embodiment of the application are uniformly and slowly added, so that the mixing is more uniform, the mixing time is shortest, the time is saved, and the energy consumption is reduced.

In general, the obtained modified carbon nanotube reinforced epdm rubber thermal insulation material is used after being pressed by a mold, so that the obtained thermal insulation material is left to stand for a certain period of time, such as 24 hours, is poured into the mold after standing, and is used after being pressed and molded.

The application further provides a preparation method of the modified carbon nanotube reinforced ethylene propylene diene monomer rubber thermal insulation material, and the thermal insulation material comprises the following components in parts by weight:

100 parts of ethylene propylene diene monomer, 10 parts of aramid fiber, 20 parts of phenolic resin, 20 parts of fumed silica, 10 parts of zinc borate, 10 parts of modified carbon nanotube, 10 parts of paraffin oil, 1.5 parts of sulfur and 4.5 parts of DCP.

The preparation method comprises the following steps:

and step S1, weighing ethylene propylene diene monomer, adding the ethylene propylene diene monomer into an XK-160 rubber mixing mill for mixing, and after rubber is wrapped by a roller, obtaining a transparent state to prepare the ethylene propylene diene monomer matrix.

And step S2, weighing aramid fibers, adding the aramid fibers into the ethylene propylene diene monomer matrix, and mixing until the aramid fibers are uniformly mixed to obtain the first matrix.

And step S3, weighing phenolic resin, adding the phenolic resin into the first matrix, and mixing until the phenolic resin and the first matrix are uniformly mixed to obtain a second matrix.

And step S4, weighing fumed silica powder, paraffin oil and zinc borate, adding into the second matrix, and mixing until uniform mixing is achieved to obtain a third matrix.

And step S5, weighing the modified carbon nanotubes, adding the weighed modified carbon nanotubes into the third matrix, and mixing the materials until the materials are uniformly mixed to obtain a fourth matrix.

And step S6, weighing sulfur and DCP, adding the sulfur and DCP into the fourth matrix, and mixing until the mixture is uniform to obtain a fifth matrix.

And S7, standing the fifth substrate for 24 hours, and then putting the fifth substrate into a mold, wherein the shape of the mold can be designed according to the self requirement. And (3) carrying out pressure vulcanization in a flat vulcanizing machine under the vulcanization condition of 160 ℃, the pressure intensity of 12MPa and the vulcanization time of 30min to obtain the modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material.

Comparative example 1 (without addition of carbon nanotube base formulation):

the embodiment provides a preparation method of an ethylene propylene diene monomer rubber heat-insulating material, which is prepared from the following raw materials: 100 parts of ethylene propylene diene monomer, 10 parts of aramid fiber, 20 parts of phenolic resin, 20 parts of fumed silica powder, 10 parts of zinc borate, 10 parts of paraffin oil, 1.5 parts of sulfur and 4.5 parts of DCP

The preparation method comprises the following steps:

step S11, weighing ethylene propylene diene monomer, adding the ethylene propylene diene monomer into an XK-160 rubber mixing mill for mixing, and after rubber is wrapped by a roller, obtaining a transparent ethylene propylene diene monomer matrix;

and S12, weighing aramid fibers, adding the weighed aramid fibers into the ethylene propylene diene monomer matrix obtained in the step S11, and mixing the weighed aramid fibers and the ethylene propylene diene monomer matrix uniformly to obtain a first matrix.

And step S13, weighing phenolic resin, adding the phenolic resin into the first matrix, and mixing until the phenolic resin and the first matrix are uniformly mixed to obtain a second matrix.

And step S14, weighing fumed silica powder, paraffin oil and zinc borate, adding into the second matrix, and mixing until uniform mixing is achieved to obtain a third matrix.

And step S15, weighing sulfur and DCP, adding the sulfur and DCP into the obtained third matrix, and mixing until the sulfur and DCP are uniformly mixed to obtain a fourth matrix.

And S16, placing the fourth substrate into a mold after the fourth substrate is placed for 24 hours, wherein the shape of the mold can be designed according to the requirement of the mold. And (3) carrying out pressure vulcanization in a flat vulcanizing machine under the vulcanization condition of 160 ℃, the pressure intensity of 12MPa and the vulcanization time of 30min to obtain the ethylene propylene diene monomer rubber heat-insulating material.

Comparative example 2 (no addition of modified carbon nanotubes, varying amounts of fumed silica powder and phenolic resin):

the embodiment provides a preparation method of an ethylene propylene diene monomer rubber heat-insulating material, which is prepared from the following raw materials:

100 parts of ethylene propylene diene monomer, 10 parts of aramid fiber, 10 parts of phenolic resin, 30 parts of fumed silica powder, 10 parts of zinc borate, 10 parts of paraffin oil, 1.5 parts of sulfur and 4.5 parts of DCP.

The preparation method of this comparative example includes the following steps:

and step S21, weighing ethylene propylene diene monomer, adding the ethylene propylene diene monomer into an XK-160 rubber mixing mill for mixing, and after rubber is wrapped by a roller, obtaining a transparent state to prepare the ethylene propylene diene monomer matrix.

And step S22, weighing aramid fibers, adding the weighed aramid fibers into the ethylene propylene diene monomer matrix obtained in the step 1, and mixing the weighed aramid fibers and the ethylene propylene diene monomer matrix uniformly to obtain a first matrix.

And step S23, weighing phenolic resin, adding the phenolic resin into the first matrix, and mixing until the phenolic resin and the first matrix are uniformly mixed to obtain a second matrix.

And step S24, weighing fumed silica powder, paraffin oil and zinc borate, adding into the second matrix, and mixing until uniform mixing is achieved to obtain a third matrix.

And step S25, weighing sulfur and DCP, adding the sulfur and DCP into the third matrix, and mixing until the sulfur and DCP are uniformly mixed to obtain a fourth matrix.

And S26, placing the fourth substrate into a mold after the fourth substrate is placed for 24 hours, wherein the shape of the mold can be designed according to the requirement of the mold. And (3) carrying out pressure vulcanization in a flat vulcanizing machine under the vulcanization condition of 160 ℃, the pressure intensity of 12MPa and the vulcanization time of 30min to obtain the ethylene propylene diene monomer rubber heat-insulating material.

Comparative example 3 (addition of uncoated carbon nanotube material):

the embodiment provides an ethylene propylene diene monomer rubber heat-insulating material added with an uncoated carbon nanotube filler, which is prepared from the following raw materials:

100 parts of ethylene propylene diene monomer, 10 parts of aramid fiber, 20 parts of phenolic resin, 20 parts of fumed silica powder, 10 parts of zinc borate, 10 parts of carbon nano tube, 10 parts of paraffin oil, 1.5 parts of sulfur and 4.5 parts of DCP.

The preparation method of the ethylene propylene diene monomer rubber heat-insulating material added with the carbon nanotube filler in the comparative example comprises the following steps:

step S31, weighing ethylene propylene diene monomer, adding the ethylene propylene diene monomer into an XK-160 rubber mixing mill for mixing, and after rubber is wrapped by a roller, obtaining a transparent ethylene propylene diene monomer matrix;

step S32, weighing aramid fibers, adding the weighed aramid fibers into the ethylene propylene diene monomer matrix obtained in the step 1, and mixing the aramid fibers and the ethylene propylene diene monomer matrix uniformly to obtain a first matrix;

and step S33, weighing phenolic resin, adding the phenolic resin into the first matrix, and mixing until the phenolic resin and the first matrix are uniformly mixed to obtain a second matrix.

And step S34, weighing fumed silica powder, paraffin oil and zinc borate, adding into the second matrix, and mixing until uniform mixing is achieved to obtain a third matrix.

Step S35, weighing the carbon nanotubes, adding the carbon nanotubes into the third matrix, and mixing the carbon nanotubes and the third matrix uniformly to obtain a fourth matrix;

and step S36, weighing sulfur and DCP, adding the sulfur and DCP into the fourth matrix, and mixing until the sulfur and DCP are uniformly mixed to obtain a fifth matrix.

And S37, placing the fifth substrate into a mold after the fifth substrate is placed for 24 hours, wherein the shape of the mold can be designed according to the requirement of the mold. And (3) carrying out pressure vulcanization in a flat vulcanizing machine under the vulcanization condition of 160 ℃, the pressure intensity of 12MPa and the vulcanization time of 30min to obtain the ethylene propylene diene monomer rubber heat-insulating material added with the carbon nano tube filler.

Comparative example 4 (5 parts of coated carbon nanotube material added):

the embodiment provides a preparation method of a modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material, which is prepared from the following raw materials:

100 parts of ethylene propylene diene monomer, 10 parts of aramid fiber, 20 parts of phenolic resin, 20 parts of fumed silica, 10 parts of zinc borate, 5 parts of modified carbon nanotube, 10 parts of paraffin oil, 1.5 parts of sulfur and 4.5 parts of DCP.

The preparation method of this comparative example includes the following steps:

step S41, weighing ethylene propylene diene monomer, adding the ethylene propylene diene monomer into an XK-160 rubber mixing mill for mixing, and after rubber is wrapped by a roller, obtaining a transparent ethylene propylene diene monomer matrix;

and step S42, weighing aramid fibers, adding the weighed aramid fibers into the ethylene propylene diene monomer matrix obtained in the step 1, and mixing the weighed aramid fibers and the ethylene propylene diene monomer matrix uniformly to obtain a first matrix.

And step S43, weighing the phenolic resin, adding the phenolic resin into the first matrix, and mixing until the phenolic resin and the first matrix are uniformly mixed to obtain a second matrix.

And step S44, weighing fumed silica powder, paraffin oil and zinc borate, adding into the second matrix, and mixing until uniform mixing is achieved to obtain a third matrix.

And step S45, weighing the modified carbon nanotubes, adding the weighed modified carbon nanotubes into the third matrix, and mixing the materials until the materials are uniformly mixed to obtain a fourth matrix.

S46, weighing sulfur and DCP, adding the sulfur and DCP into a fourth matrix, and mixing until the sulfur and DCP are uniformly mixed to obtain a fifth matrix;

and S47, placing the fifth substrate into a mold after the fifth substrate is placed for 24 hours, wherein the shape of the mold can be designed according to the requirement of the mold. And (3) carrying out pressure vulcanization in a flat vulcanizing machine under the vulcanization condition of 160 ℃, the pressure intensity of 12MPa and the vulcanization time of 30min to obtain the modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material.

The ablation performance of the above examples was tested according to the test method of GJB 323A/96, and the test results are shown in Table 1 below:

	charring ablation rate mm/s
		Comparative example 1	0.218
Comparative example 3	0.232
		EXAMPLE 1 of the present application	0.166

As can be seen from table 1, compared with the epdm rubber thermal insulation material without the carbon nanotube filler and only the original carbon nanotube filler, pre-coating the carbon nanotube filler can significantly improve the ablation resistance of the material, the carbonization ablation rate of the modified carbon nanotube-reinforced epdm rubber thermal insulation material is 76.15% of the ablation rate of the epdm rubber thermal insulation material with the uncoated carbon nanotube filler, and the carbonization ablation rate of the modified carbon nanotube-reinforced epdm rubber thermal insulation material is 71.55% of the ablation rate of the basic formula of the epdm rubber thermal insulation material without the carbon nanotube filler.

It can be seen that the thermal insulation material according to the embodiment of the present invention maintains the excellent particle erosion resistance of the original carbon nanotube reinforced thermal insulation material, and greatly reduces the charring ablation rate under the high-temperature gas condition.

Claims (5)

1. A preparation method of a modified carbon nanotube is characterized by comprising the following steps:

weighing carbon nanotubes and placing the carbon nanotubes into a high-temperature furnace, vacuumizing the high-temperature furnace to be less than or equal to-0.09 MPa, introducing inert gas into the high-temperature furnace until the pressure in the high-temperature furnace is greater than the standard atmospheric pressure and the purity of the inert gas in the high-temperature furnace is greater than or equal to 98%, opening a gas outlet of the high-temperature furnace, and keeping the inert gas in circulation;

heating the high-temperature furnace to 800 ℃;

stopping inputting the inert gas, and inputting hydrocarbon carbon source gas into the high-temperature furnace, wherein the flow of the hydrocarbon carbon source gas is 50-600 ml/min;

and (4) preserving the heat of the high-temperature furnace until the modified carbon nano tube is formed.

2. The method of claim 1, wherein the carbon nanotube has an inner diameter of 0.8 to 5nm, an outer diameter of 0.9 to 15nm, and a length of 1 to 20 μm.

3. The method of claim 2, wherein the hydrocarbon carbon source gas is at least one of methane, ethane, acetylene, propane, and propylene.

4. The modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material is characterized by comprising the following raw materials in parts by weight:

100 parts of ethylene propylene diene monomer;

5-15 parts of aramid fiber;

10-30 parts of phenolic resin;

10-30 parts of fumed silica powder;

5-15 parts of zinc borate;

1-15 parts of modified carbon nanotubes;

5-15 parts of paraffin oil;

0.5-2 parts of sulfur; and

2-5 parts of DCP;

the modified carbon nanotube is produced by the method for producing a modified carbon nanotube according to any one of claims 1 to 3.

5. The preparation method of the modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material is characterized by comprising the following steps of:

weighing 100 parts by weight of ethylene propylene diene monomer, and preparing an ethylene propylene diene monomer matrix;

weighing 5-15 parts by weight of aramid fiber, adding the aramid fiber into the ethylene propylene diene monomer matrix, and mixing until the aramid fiber and the ethylene propylene diene monomer matrix are uniformly mixed to obtain a first matrix;

weighing 10-30 parts by weight of phenolic resin, adding into the first matrix, and mixing until the mixture is uniform to obtain a second matrix;

weighing 10-30 parts by weight of fumed silica powder, 5-15 parts by weight of paraffin oil and 5-15 parts by weight of zinc borate, adding into the second matrix, and mixing until uniform mixing is achieved to obtain a third matrix;

weighing 1-15 parts by weight of modified carbon nanotubes, adding the modified carbon nanotubes into the third matrix, and mixing until the mixture is uniformly mixed to obtain a fourth matrix;

weighing sulfur and DCP, adding the sulfur and DCP into the fourth matrix, and mixing until the sulfur and DCP are uniformly mixed to obtain a fifth matrix;

vulcanizing the fifth matrix at the temperature of 140-160 ℃ for 20-60 min to obtain the modified carbon nanotube reinforced ethylene propylene diene monomer rubber heat-insulating material;

the modified carbon nanotube is produced by the method for producing a modified carbon nanotube according to any one of claims 1 to 3.

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