CN114957829B - Boron nitride composite material containing coconut shell carbon and preparation method and application thereof - Google Patents

Boron nitride composite material containing coconut shell carbon and preparation method and application thereof Download PDF

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CN114957829B
CN114957829B CN202210365181.2A CN202210365181A CN114957829B CN 114957829 B CN114957829 B CN 114957829B CN 202210365181 A CN202210365181 A CN 202210365181A CN 114957829 B CN114957829 B CN 114957829B
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boron nitride
coconut shell
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shell carbon
nitride composite
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CN114957829A (en
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杨薛明
宋宣
胡宗杰
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North China Electric Power University
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08K3/38—Boron-containing compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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Abstract

The invention relates to the technical field of composite materials, and provides a boron nitride composite material containing coconut shell carbon, and a preparation method and application thereof; the boron nitride composite material containing the coconut shell carbon comprises the following components in percentage by mass: 0.5 to 5 percent of coconut shell carbon, 1 to 40 percent of boron nitride and 55 to 97 percent of high-density polyethylene. The invention has synergistic effect by matching the coconut shell carbon, the boron nitride and the high-density polyethylene, and improves the heat conductivity, the insulating property and part of mechanical strength of the composite material. The interface thermal resistance between the boron nitride sheet and the HDPE matrix is reduced, and meanwhile, the coconut shell carbon can be connected with the isolated boron nitride sheet, so that a more effective heat conduction path is formed, the thermal conductivity of the composite material is cooperatively improved, and the composite material has good application value in the fields of insulated cables and the like.

Description

Boron nitride composite material containing coconut shell carbon and preparation method and application thereof
Technical Field
The invention relates to the technical field of composite materials, in particular to a boron nitride composite material containing coconut shell carbon, and a preparation method and application thereof.
Background
At present, when the cable runs, the wire core and the insulating layer can generate loss and generate heat, the low heat conductivity of the cable can limit the improvement of the current-carrying capacity of the cable, if the cable runs at too high temperature for a long time, the aging can be accelerated, the insulating service life is reduced, and the conveying capacity can only be reduced or the section of the cable can be increased to ensure the safety of the cable. In addition, the ice storage device studied in China basically adopts common plastic materials, and although the corrosion resistance is better, the service life is prolonged to about 30 years, but in order to make up for the defect of lower heat conductivity coefficient of the plastic materials, a method for reducing the heat exchange pipe diameter and increasing the heat exchange area is generally adopted, but the application range of the ice storage device is reduced to a small and medium-sized building type internal ice melting system, and the ice storage device cannot be applied to more scenes. In both the cable and the ice melting and storing device, a material with high heat conducting performance needs to be developed.
The boron nitride can be used as a high-temperature solid lubricant, an extrusion abrasion-resistant additive, an additive for producing ceramic composite materials, a refractory material and an antioxidant additive, especially for occasions of resisting molten metal corrosion, a heat enhancement additive and a high-temperature resistant insulating material, and can be widely applied to various occasions; polyethylene is also widely used for high voltage insulated cables because of its excellent electrical, mechanical and processability.
To enhance thermal conductivity, fillers may be added to the boron nitride composite. The thermal conductivity of the polymer composite incorporating the filler is still low compared to the filler itself, mainly due to the weaker interactions and poor dispersibility between the fillers, which results in a large interfacial thermal resistance; the cost of thermally conductive composites and nanocomposites should be considered when using high levels of expensive fillers, and the production of such composites may offset the low cost advantage of polyolefins.
Many methods of bridging two-dimensional fillers by flexible one-dimensional fillers have been reported in the prior art, and the synergistic effect produced by such methods increases the mixed filler heat conduction network due to the expansion of the filler connection area, further increasing the thermal conductivity of the composite material.
CN111847450a discloses a preparation method and application of coconut shell carbon/three-dimensional graphene composite material, comprising the following steps: s1, pretreating coconut shells to obtain a three-dimensional coconut shell fiber skeleton; s2, carbonizing the three-dimensional coconut fiber framework under inert atmosphere, and then reaming and activating to obtain the three-dimensional porous activated carbon fiber framework; s3, preparing graphene oxide dispersion liquid, and adding functional components into the graphene oxide dispersion liquid to obtain a composite solution; s4, reacting the activated carbon fiber skeleton with the composite solution at high temperature and high pressure for 0.5-24 hours, and cleaning and drying after the reaction is finished; s5, sintering the sample obtained in the step S4 under inert atmosphere to obtain the coconut shell carbon/three-dimensional graphene composite material, so that the problem that the three-dimensional graphene is easy to crack in the preparation process is solved, and the obtained coconut shell carbon/three-dimensional graphene composite material has better mechanical property and electromagnetic wave absorption property. However, the composite material prepared by the method is not suitable for being applied to heat conducting materials.
Accordingly, in view of the above shortcomings, it is desirable to provide a boron nitride type composite material that enhances the thermal conductivity of the composite material.
Disclosure of Invention
The invention aims to solve the technical problems that the existing boron nitride composite material has low heat conductivity and poor effect with filler, and provides a boron nitride composite material containing coconut shell carbon, and a preparation method and application thereof.
In order to solve the technical problems, in a first aspect, the present invention provides a boron nitride composite material containing coconut shell carbon, wherein the boron nitride composite material containing coconut shell carbon comprises the following components in percentage by mass: coconut shell carbon 0.5% -5% (e.g., 0.5%, 0.6%, 0.8%, 1%, 1.2%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%, etc.), boron nitride 1% -40% (e.g., 1%, 2%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, or 40%, etc.), and high density polyethylene 55% -97% (e.g., 55%, 60%, 65%, 70%, 72%, 73%, 74%, 80%, 85%, 90%, 94%, or 97%, etc.).
In the invention, the boron nitride is in a two-dimensional lamellar structure, the diameter is about 1 mu m, the thickness is 70-120nm, and the size of the coconut shell carbon is about 10-50 mu m. Coconut shell charcoal has an irregular three-dimensional block and rod structure. By hot pressing, the distance between the boron nitride sheet and the High Density Polyethylene (HDPE) substrate is reduced; therefore, the interface thermal resistance between the boron nitride sheet and the HDPE matrix is reduced, and the coconut shell carbon can be connected with the isolated boron nitride sheet, so that a more effective heat conduction path is formed, and the heat conductivity of the composite material is cooperatively improved.
In the presently disclosed technology, natural fibers have evolved as a substitute for traditional glass fibers and carbon fibers in the production of thermoplastic composites. Natural fibers such as coconut, bamboo, banana, jute and the like are environment-friendly materials, and have good reinforcing effect in a polymer matrix, so that the cost for preparing the composite material is reduced. Coconuts are widely planted in tropical countries, and their outer shells are mostly disposed of as waste. The shell part of coconut is a potential resource for reinforcing natural fibers of the polymer composite material, but at present, the aspect of mechanical property and adsorption property of the coconut shell carbon is mainly applied, and no synergistic effect is formed on the aspect of the synergistic effect of the coconut shell carbon, boron nitride and HDPE, which can improve the heat conduction effect, compared with the research of the coconut shell carbon in the aspect of adsorption or mechanical property, the synergistic effect of the coconut shell carbon, which is matched with the characteristics of multiple dimensions, multiple dimensions and multiple shapes of the boron nitride, is unexpectedly researched, and the performance in the aspect of heat conductivity is further improved.
In addition, the coconut shell charcoal has the advantage of cost, is low in price and is suitable for a wider range of applications. If boron nitride is used in the whole, the cost is high, and the coconut shell carbon is used for replacing a part of boron nitride, so that the cost can be greatly reduced.
The calculation formula of the cooperative efficiency is as follows:
Figure BDA0003586795140000031
wherein "lambda HDPE/xBN ”，“λ HDPE/yCSC "and" lambda HDPE/xBN/yCSC "thermal conductivity of binary and ternary composite materials respectively," CSC stands for coconut shell carbon, x and y stand for indefinite proportions, i.e. any mass percent. If the f-number is greater than 1, it is indicated that BN (boron nitride) and coconut shell carbon have a synergistic effect in improving the heat conducting properties of HDPE (high density polyethylene). The larger f-number means a stronger synergistic effect on thermal conductivity between fillers.
Preferably, the boron nitride composite material containing coconut shell carbon comprises the following components in percentage by mass: 1-5% of coconut shell carbon, 5-30% of boron nitride and 65-94% of high-density polyethylene.
Preferably, the boron nitride composite material containing coconut shell carbon comprises the following components in percentage by mass: 1-3% of coconut shell carbon, 25% of boron nitride and 72-74% of high-density polyethylene.
In the invention, boron nitride is obviously increased (for example, 25 weight percent of boron nitride has higher thermal conductivity than 5 weight percent of boron nitride) and forms a network structure in the matrix, a small amount of coconut shell carbon can be used as an island to connect isolated boron nitride sheets, so that more effective thermal conduction networks are formed in the matrix, and the synergistic effect is also greatly improved, so that the thermal conductivity is improved. When the boron nitride filler content reaches 25wt%, the hot pressing method makes the in-plane orientation of the boron nitride sheet more ordered, and this arrangement of the boron nitride sheet enhances the thermal conductivity of the composite material. However, when the mass fraction of boron nitride is 25%, the coconut shell carbon is added from 1% to 5%, and the heat conductivity of the composite material is firstly increased and then reduced.
Preferably, the boron nitride composite material containing coconut shell carbon comprises the following components in percentage by mass: coconut shell carbon 1%, boron nitride 25% and high-density polyethylene 74%.
Preferably, the boron nitride composite material containing coconut shell carbon comprises the following components in percentage by mass: 2% of coconut shell carbon, 25% of boron nitride and 73% of high-density polyethylene.
Preferably, the boron nitride composite material containing coconut shell carbon comprises the following components in percentage by mass: 3% of coconut shell carbon, 25% of boron nitride and 72% of high-density polyethylene.
In the present invention, for a composite formed of high density polyethylene, 25wt% boron nitride and 3wt% coconut shell carbon, the coconut shell carbon is larger and the smaller size boron nitride is dispersed around the coconut shell carbon. Boron nitride acts as a bridge between islands, forming a more efficient packing network and good synergistic effect in ternary systems. At the moment, the boron nitride composite material containing the coconut shell carbon has the best performance, the normal thermal conductivity is improved to the maximum, and the mechanical property and the insulating property are improved.
Preferably, the normal thermal conductivity of the boron nitride composite material containing the coconut shell carbon is 0.480-0.955 W.m - 1 K -1 . Wherein, the meaning of normal thermal conductivity is: the heat flow direction is perpendicular to the thermal conductivity of the filler in the thickness direction.
Preferably, the boron nitride composite material containing coconut shell carbon has an in-plane thermal conductivity of 4.276-5.294 W.m - 1 K -1 . Wherein, in-plane heatThe meaning of the conductivity is: the direction of heat flow is parallel to the thermal conductivity of the filler in the diameter direction.
In the invention, the normal thermal conductivity and the in-plane thermal conductivity react with the thermal conductivity of the material in different directions. Since boron nitride is an anisotropic material, the thermal conductivity in all directions is different, and the arrangement of the boron nitride becomes ordered through a hot pressing process, so that the characteristic of anisotropy is more prominent.
In the present invention, the in-plane thermal conductivity shows different results at different mass percentages. For example, when the boron nitride is 25% by mass, the coconut shell carbon is 3% by mass, and the high-density polyethylene is 72% by mass, the in-plane thermal conductivity is 4.276W m -1 K -1 While when the mass percent of boron nitride is 40%, the mass percent of coconut shell carbon is 4.8% and the mass percent of high-density polyethylene is 55.2%, the in-plane thermal conductivity is 5.294 W.m -1 K -1 。
Preferably, the tensile strength of the boron nitride composite material containing the coconut shell carbon is 21.8960-23.8050 MPa.
In a second aspect, the present invention provides a method for preparing the boron nitride composite material containing coconut shell carbon according to the first aspect, the method comprising: and mixing the coconut shell carbon, the boron nitride and the high-density polyethylene, stirring, extruding, and hot-pressing to obtain the boron nitride composite material containing the coconut shell carbon.
In the preparation process of the invention, the raw materials of the coconut shell carbon and the boron nitride exist in the form of powder, and the high-density polyethylene generally exists in the form of particles. The coconut charcoal powder was repeatedly washed with water to remove surface impurities prior to preparation. And after removing impurities, further drying for use.
Preferably, the temperature of the extrusion is 150 to 200 ℃, which may be 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃ or 200 ℃, for example.
The extrusion speed is 20-50 r/min, for example, 20r/min, 30r/min, 40r/min, 50r/min, etc.
In the present invention, the extrusion is generally carried out in a twin-screw extruder, preferably at a temperature of 180℃and a rotational speed of 30r/min.
Preferably, the hot pressing temperature is 150 to 200 ℃, and may be 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃ or 200 ℃, for example.
The pressure of the hot pressing is 10 to 20MPa, and may be, for example, 10MPa, 11MPa, 12 MPa, 13MPa, 14MPa, 15MPa, 16MPa, 17MPa, 18MPa, 19MPa, 20MPa, or the like.
The hot pressing time is 10 to 20 minutes, for example, 10 minutes, 13 minutes, 15 minutes, 18 minutes, 20 minutes, or the like.
The hot pressing process of the present invention is generally carried out in a hot press. Before the hot pressing starts, the mixture particles are preheated.
In a third aspect, the invention provides the use of a boron nitride composite material containing coconut shell carbon as described in the first aspect in insulated cables or coils of ice thermal storage systems.
The low thermal conductivity of the cable limits the improvement of the current carrying capacity, and if the cable is operated at too high a temperature for a long time, the aging is accelerated, and the insulation life is reduced.
The ice storage device is core equipment of the ice storage air conditioning system, and research and development of the high-heat-conductivity composite material of the outer ice melting coil can provide important guarantee for improving the efficiency of the ice storage device. The outer ice-melting coil pipe freezes the refrigerating medium in the outer ice-melting coil pipe into ice through the ice storage device at night, and the refrigerating capacity is released by melting the ice in the outer ice-melting coil pipe in daytime, so that the power consumption pressure in the power consumption peak period is relieved. The heat conducting property of the outer ice melting coil pipe is improved, and the working efficiency of the outer ice melting coil pipe can be improved.
The implementation of the invention has the following beneficial effects:
the invention has synergistic effect by matching the coconut shell carbon, the boron nitride and the high-density polyethylene, and improves the heat conductivity and the physical strength of the composite material. The boron nitride is in a two-dimensional lamellar structure, the diameter is about 1 mu m, the thickness is 70-120nm, the boron nitride is used as a bridge between islands, and a more effective filling network and a good synergistic effect are formed in a ternary system. By hot pressing, the distance between the boron nitride sheet and the High Density Polyethylene (HDPE) substrate is reduced; the size of the coconut shell carbon is about 10-50 mu m, the coconut shell carbon has an irregular three-dimensional block-shaped and rod-shaped structure, and the characteristics of multiple dimensions, multiple dimensions and multiple shapes of the coconut shell carbon are utilized to further form a synergistic effect, so that the heat conductivity is improved. Therefore, the interface thermal resistance between the boron nitride sheet and the HDPE matrix is reduced, and the coconut shell carbon can be connected with the isolated boron nitride sheet, so that a more effective heat conduction path is formed, and the heat conductivity of the composite material is cooperatively improved.
The normal thermal conductivity of the boron nitride composite material containing the coconut shell carbon provided by the invention is 0.480-0.955 W.m -1 K -1 An in-plane thermal conductivity of 4.276 to 5.294 W.m -1 K -1 Has good tensile strength and good application value in the fields of insulated cables and the like.
Drawings
FIG. 1 is a scanning electron micrograph (scale 50 μm) of coconut charcoal powder used in the present invention.
FIG. 2 is a scanning electron microscope (scale 1 μm) of the boron nitride powder used in the present invention.
FIG. 3 is a liquid nitrogen extraction breaking scanning electron microscope (scale 10 μm) of the composite material provided in example 6 of the present invention.
FIG. 4 is a drawing of a tensile fracture scanning electron microscope (scale 10 μm) of the composite material provided in example 6 of the present invention.
FIG. 5 is a liquid nitrogen extractive scanning electron microscope (scale 10 μm) of the composite material provided in comparative example 3 of the present invention.
FIG. 6 is a drawing of a tensile fracture scanning electron microscope (scale 10 μm) of the composite material provided in comparative example 3 of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The preparation process of the boron nitride composite material containing coconut shell carbon provided in the following examples and comparative examples of the present invention is substantially the same, except for the ratio among the coconut shell carbon, boron nitride and high density polyethylene. The preparation method comprises the following steps:
(1) The coconut charcoal powder was repeatedly washed with deionized water to remove surface impurities, and then placed in a vacuum drying oven and dried at 80 c for 3 hours.
(2) Mixing the dried coconut shell carbon powder, boron nitride powder and high-density polyethylene particles according to mass ratio, firstly stirring for 3 minutes in a beaker, premixing boron nitride or coconut shell carbon with different mass contents and high-density polyethylene particles, then mixing for 20 minutes by a double-screw extruder under the conditions of 180 ℃ and screw rotating speed of 30r/min, and then extruding and granulating.
(3) Preheating the blend particles in the step (2) for 10min at 180 ℃ of a hot press, and then hot-pressing for 15min at 180 ℃ and 15MPa to obtain the boron nitride composite material containing the coconut shell carbon.
The electron microscope of the coconut shell carbon powder is shown in fig. 1, and the electron microscope of the boron nitride powder is shown in fig. 2.
Example 1
The embodiment provides a boron nitride composite material containing coconut shell carbon, which specifically comprises 0.1g of coconut shell carbon, 0.5g of boron nitride and 9.4g of high-density polyethylene.
Example 2
The embodiment provides a boron nitride composite material containing coconut shell carbon, which specifically comprises 0.2g of coconut shell carbon, 0.5g of boron nitride and 9.3g of high-density polyethylene.
Example 3
The embodiment provides a boron nitride composite material containing coconut shell carbon, which specifically comprises 0.3g of coconut shell carbon, 0.5g of boron nitride and 9.2g of high-density polyethylene.
Example 4
The embodiment provides a boron nitride composite material containing coconut shell carbon, which specifically comprises 0.1g of coconut shell carbon, 2.5g of boron nitride and 7.4g of high-density polyethylene.
Example 5
The embodiment provides a boron nitride composite material containing coconut shell carbon, which specifically comprises 0.2g of coconut shell carbon, 2.5g of boron nitride and 7.3g of high-density polyethylene.
Example 6
The embodiment provides a boron nitride composite material containing coconut shell carbon, which specifically comprises 0.3g of coconut shell carbon, 2.5g of boron nitride and 7.2g of high-density polyethylene. The liquid nitrogen extraction outage electron microscope diagram of the composite material is shown in fig. 3, and the stretching fracture electron microscope diagram is shown in fig. 4.
Example 7
The embodiment provides a boron nitride composite material containing coconut shell carbon, which specifically comprises 0.4g of coconut shell carbon, 2.5g of boron nitride and 7.1g of high-density polyethylene.
Example 8
The embodiment provides a boron nitride composite material containing coconut shell carbon, which specifically comprises 0.5g of coconut shell carbon, 2.5g of boron nitride and 7.0g of high-density polyethylene.
Comparative example 1
This comparative example provides a high density polyethylene material, specifically comprising 10g of high density polyethylene.
Comparative example 2
The comparative example provides a boron nitride composite material, specifically comprising 0.5g of boron nitride and 9.5g of high-density polyethylene.
Comparative example 3
This comparative example provides a boron nitride composite material, specifically comprising 2.5g of boron nitride and 7.5g of high density polyethylene. The liquid nitrogen extraction electron microscope image of the composite material is shown in fig. 5, and the tensile fracture electron microscope image is shown in fig. 6.
The boron nitride composites containing coconut shell carbon provided in examples 1-8 and comparative examples 1-3 above were tested for performance for normal thermal conductivity, in-plane thermal conductivity, tensile strength, and volume resistivity by the following specific test methods:
the normal thermal conductivity and the in-plane thermal conductivity were both measured using a laser thermal conductivity analyzer LFA 467 (german relaxation science instrument), a wafer with sample size diameters and thicknesses of 25.4mm and 0.15mm, respectively, and a square piece with sample sizes of 10mm x 2mm, measuring the normal thermal conductivity.
Tensile strength was measured using a universal tester (UTM 6104X, shenzhen three si longitudinal and transverse technologies inc.).
Volume resistivity was measured using a high resistance meter (Agilent is German-Keysight B2985A, USA) in the frequency range of 100kHz-100 MHz.
The data obtained by the test are shown in table 1 below:
TABLE 1
Figure BDA0003586795140000091
Figure BDA0003586795140000101
From the data in Table 1, it can be seen that the boron nitride content has a greater effect on the thermal conductivity of the composite material as seen by comparison between examples 1-8. With the increase of the boron nitride content, the thermal conductivity of the composite material is increased. According to the calculation formula for calculating the synergistic efficiency f, f of the HDPE/5BN/yCSC sample is smaller than 1, and the change is not large along with the increase of the content of the coconut shell charcoal, which indicates that the synergistic effect between BN and the coconut shell charcoal is weaker. In HDPE/25BN/yCSC systems, the f number is greater than 1, the value increasing with increasing coconut charcoal content. This suggests that a large number of BN flakes increase the chance of contact with the coconut carbon, which helps promote synergy of BN and coconut carbon. Indicating that the connection of coconut shell carbon and BN with different sizes, forms and dimensions in the composite material produces a synergistic effect.
As is evident from the comparison between examples 1 to 6, the composite material has better properties at a boron nitride content of 25%. The composite material formed by 72wt% of high-density polyethylene, 25wt% of boron nitride and 3wt% of coconut shell carbon has the best normal thermal conductivity, in-plane thermal conductivity, volume resistivity and stretching strength, and the comprehensive performance is the best.
As is evident from the comparison between comparative examples 1 to 3 and examples, the boron nitride composite material containing no coconut shell carbon exhibited a decrease in thermal conductivity and a decrease in performance under the same boron nitride content.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (13)

1. A boron nitride composite material containing coconut shell carbon, characterized in that: the boron nitride composite material containing the coconut shell carbon comprises the following components in percentage by mass: 0.5 to 5 percent of coconut shell carbon, 1 to 40 percent of boron nitride and 55 to 97 percent of high-density polyethylene; the boron nitride is in a two-dimensional lamellar structure.
2. The boron nitride composite material containing coconut shell carbon of claim 1, wherein: the boron nitride composite material containing the coconut shell carbon comprises the following components in percentage by mass: 1-5% of coconut shell carbon, 5-30% of boron nitride and 65-94% of high-density polyethylene.
3. The boron nitride composite material containing coconut shell carbon of claim 2, wherein: the boron nitride composite material containing the coconut shell carbon comprises the following components in percentage by mass: 1-3% of coconut shell carbon, 25% of boron nitride and 72-74% of high-density polyethylene.
4. The boron nitride composite material of claim 3, wherein the boron nitride composite material comprises coconut shell carbon and is characterized by: the boron nitride composite material containing the coconut shell carbon comprises the following components in percentage by mass: coconut shell carbon 1%, boron nitride 25% and high-density polyethylene 74%.
5. The boron nitride composite material of claim 3, wherein the boron nitride composite material comprises coconut shell carbon and is characterized by: the boron nitride composite material containing the coconut shell carbon comprises the following components in percentage by mass: 2% of coconut shell carbon, 25% of boron nitride and 73% of high-density polyethylene.
6. The boron nitride composite material of claim 3, wherein the boron nitride composite material comprises coconut shell carbon and is characterized by: the boron nitride composite material containing the coconut shell carbon comprises the following components in percentage by mass: 3% of coconut shell carbon, 25% of boron nitride and 72% of high-density polyethylene.
7. The boron nitride composite material comprising coconut shell carbon of any one of claims 1-6, wherein: the normal thermal conductivity of the boron nitride composite material containing the coconut shell carbon is 0.485-0.955 W.m -1 ·K -1 。
8. The boron nitride composite material comprising coconut shell carbon of any one of claims 1-6, wherein: the boron nitride composite material containing the coconut shell carbon has an in-plane thermal conductivity of 4.276-5.294 W.m -1 K -1 。
9. The boron nitride composite material comprising coconut shell carbon of any one of claims 1-6, wherein: the tensile strength of the boron nitride composite material containing the coconut shell carbon is 21.8960-23.8050 MPa.
10. The method for producing a boron nitride composite material containing coconut shell carbon according to any one of claims 1 to 6, wherein: the preparation method comprises the following steps: mixing the coconut shell carbon, the boron nitride and the high-density polyethylene, stirring, extruding, and hot-pressing to obtain the boron nitride composite material containing the coconut shell carbon.
11. The method of manufacturing according to claim 10, wherein: the extrusion temperature is 150-200 ℃, and the extrusion rotating speed is 20-50 r/min.
12. The method of manufacturing according to claim 10, wherein: the hot pressing temperature is 150-200 ℃, the hot pressing pressure is 10-20 MPa, and the hot pressing time is 10-20 min.
13. Use of the boron nitride composite material containing coconut shell carbon according to any one of claims 1-6 in insulated cables or ice thermal storage system coils.
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