Preparation method of heat conducting agent and preparation method of heat conducting flame-retardant rope

Abstract

The application provides a preparation method of a heat-conducting agent and a preparation method of a heat-conducting and flame-retardant rope. The application disperses nano aluminum nitride into an alcohol solvent, then adds a silicate material, coats the silicate material onto the surface of aluminum carbide through a liquid phase method, and prepares a silicon dioxide and carbon coated aluminum nitride material through high-temperature calcination (under an inert atmosphere). The method has the advantages of simplicity and controllable coating layer, and has hydrophobic and synergistic heat-conducting functions. The preparation method of the heat-conducting and flame-retardant rope is different from the traditional heat-conducting agent treatment of a textile rope. The isocyanate reacts with water to form a carboxylic acid group, and the carboxylic acid group and phytic acid and a ternary alcohol glycerol crosslink at high temperature. On the one hand, the phytic acid of the flame-retardant component is grafted in a chemical bond mode, and on the other hand, the isocyanate and the polyhydric alcohol form an organic coating layer similar to a polyurethane structure to firmly adhere the modified heat-conducting agent to the textile rope, so that a multifunctional material with heat-conducting and flame-retardant functions is formed.

Description

Technical Field

[0001] This invention relates to the field of thermally conductive and flame-retardant materials, and in particular to a method for preparing a thermally conductive agent and a method for preparing a thermally conductive and flame-retardant rope. Background Technology

[0002] With the rapid development of the national economy, my country's electricity demand is constantly increasing. Ultra-high voltage direct current (UHVDC) transmission lines are widely used due to their high transmission capacity and low loss. Furthermore, the connected AC system does not require synchronization. This results in less damage during grid failures, making it particularly suitable for long-distance transmission. However, the electromagnetic and thermal effects of UHVDC transmission lines may impact the surrounding environment and daily life. Besides extensive research on magnetic shielding, it is also necessary to consider the timely dissipation of heat generated during transmission; otherwise, heat accumulation can lead to significant safety risks. Therefore, finding effective thermal management materials is urgently needed.

[0003] Electrical insulation performance is crucial in the selection of thermal management materials, as it acts as an electrical insulator. While most polymers offer electrical insulation and a high degree of design freedom, their thermal conductivity is typically within a narrow range (0.1-0.5 W / mK) and their coefficient of thermal expansion is high. Adding too little inorganic filler with high thermal conductivity and electrical insulation to polymers fails to provide adequate thermal conductivity, while excessive filler severely impacts the material's mechanical properties, making it difficult to meet practical application requirements. Textile ropes offer potential advantages over polymers, such as flexibility and suppleness. Treated with numerous thermally conductive agents, textile ropes possess metallic thermal conductivity, chemical stability, electrical insulation properties, and lightweight characteristics, enabling them to effectively dissipate heat generated during wire and cable use, preventing heat accumulation. This potential thermal management application requires high thermal conductivity, making the material's thermal conductivity and insulation properties particularly important.

[0004] Among numerous inorganic fillers, aluminum nitride (AlN) is considered an ideal choice due to its high thermal conductivity (70–140 W / m K), non-toxicity, stable crystal structure, low cost, and low coefficient of thermal expansion and dielectric constant. However, its heat transfer efficiency is low because of the large interfacial thermal resistance between the filler and the matrix. Furthermore, aluminum nitride is extremely unstable and easily decomposes in humid environments (the hydrolysis reaction of AlN is: AlN + 3H₂O → Al(OH)₃ + NH₃). The hydrophilic nature of AlN significantly limits its application in integrated circuits.

[0005] Given the current hydrophilicity of aluminum nitride materials, it is necessary to modify them to achieve better flame retardancy and thermal conductivity. Summary of the Invention

[0006] In view of this, the present invention provides a method for preparing a thermally conductive agent and a method for preparing a thermally conductive and flame-retardant rope, so as to solve the defects existing in the prior art.

[0007] In a first aspect, the present invention provides a method for preparing a thermally conductive agent, comprising the following steps:

[0008] Nano-aluminum nitride is dispersed in an alcohol solvent, then silicate ester material is added, mixed evenly, and dried to obtain organosilicon-coated aluminum nitride material;

[0009] Silicon-coated aluminum nitride is calcined under an inert atmosphere to obtain silicon dioxide and carbon-coated modified aluminum nitride, which is a thermal conductive agent.

[0010] Preferably, in the method for preparing the thermal conductive agent, the silicate ester material includes at least one of methyl silicate, ethyl silicate, and propyl silicate.

[0011] And / or, the alcohol solvent includes at least one of methanol, ethanol, and glycerol.

[0012] Preferably, in the preparation method of the heat-conducting agent, the calcination temperature is 400-600℃ and the calcination time is 3-10h.

[0013] Preferably, in the preparation method of the thermal conductive agent, the mass-to-volume ratio of the nano-aluminum nitride, alcohol solvent, and silicate material is (800-1200) g:(400-500) mL:(100-200) mL.

[0014] Secondly, the present invention also provides a method for preparing a thermally conductive and flame-retardant rope, comprising the following steps:

[0015] The thermally conductive agent prepared by the above preparation method is dispersed in isocyanate and mixed to obtain a first solution;

[0016] Glycerol and phytic acid are dispersed in water and mixed to obtain a second solution;

[0017] The textile rope is passed through a first solution and a second solution in sequence, and then subjected to cross-linking and curing treatment to obtain a thermally conductive and flame-retardant rope.

[0018] Preferably, in the method for preparing the thermally conductive and flame-retardant rope, the isocyanate includes at least one of monoisocyanate, diisocyanate, and polyisocyanate.

[0019] Preferably, in the preparation method of the thermally conductive and flame-retardant rope, the mass-to-volume ratio of the thermally conductive agent to the isocyanate is (150-250) g:(200-400) mL.

[0020] Preferably, in the preparation method of the thermally conductive and flame-retardant rope, the mass ratio of glycerol, phytic acid and water in the second solution is (2-1):1:(5-10).

[0021] Preferably, the method for preparing the thermally conductive and flame-retardant rope involves passing the textile rope through a first solution and a second solution sequentially at a rate of 10-50 m / min, and then performing a cross-linking and curing treatment at 100-180°C to obtain the thermally conductive and flame-retardant rope.

[0022] Preferably, in the method for preparing the thermally conductive and flame-retardant rope, the material of the textile rope is any one of cotton, polypropylene, nylon, and polyester.

[0023] The present invention has the following advantages over the prior art:

[0024] 1. The preparation method of the thermal conductive agent of the present invention involves dispersing nano-aluminum nitride in an alcohol solvent, then adding silicate materials, coating the silicate materials onto the surface of aluminum carbide using a liquid-phase method, and then preparing a silica and carbon-coated aluminum nitride material through high-temperature calcination (under an inert atmosphere). This method, in addition to its simplicity and controllable coating layer, also possesses hydrophobic and synergistic thermal conductivity functions. The present invention modifies aluminum nitride by treating its surface with silica and carbon materials after high-temperature calcination, forming a dense protective layer. On the one hand, the hydrophobicity of silica is used to treat the surface of aluminum nitride to prevent the risk of water decomposition; on the other hand, the excellent thermal conductivity of carbon materials further assists in improving the thermal conductivity of aluminum nitride, which is significantly different from traditional silica surface modification. Compared with traditional aluminum nitride modification, it achieves uniform carbon and silicon coating in a liquid dispersion state; on the other hand, it improves the thermal conductivity of aluminum nitride while ensuring environmental friendliness and hydrophobicity. Furthermore, the addition of the aluminum nitride thermal conductive agent also improves the wear resistance of the coating.

[0025] 2. The preparation method of the thermally conductive and flame-retardant rope of the present invention differs from the traditional method of treating textile ropes with thermally conductive agents. It utilizes the reaction of isocyanate with water to form carboxylic acid groups. At high temperature, these carboxylic acid groups undergo a cross-linking reaction with phytic acid and triglycerides. On one hand, the flame-retardant component, phytic acid, is grafted onto the rope through chemical bonds. On the other hand, isocyanate and polyols form an organic coating with a polyurethane-like structure, firmly adhering the modified thermally conductive agent to the textile rope, thus creating a multifunctional material that combines thermal conductivity and flame retardancy. Therefore, this invention has high practical significance and application value. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a scanning electron microscope image of the thermally conductive agent prepared in Example 1 of the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of embodiments. Furthermore, in the description of this application, the term "comprising" means "including but not limited to". Various embodiments of the present invention may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the invention; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single digits within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Additionally, whenever a numerical range is indicated herein, it means including any referenced number (fraction or integer) within the indicated range.

[0030] This application provides a method for preparing a thermally conductive agent, comprising the following steps:

[0031] S1. Disperse nano-aluminum nitride in an alcohol solvent, then add silicate ester materials, mix evenly, and dry to obtain organosilicon-coated aluminum nitride materials;

[0032] S2. The organosilicon-coated aluminum nitride material is calcined under an inert atmosphere to obtain silicon dioxide and carbon-coated modified aluminum nitride material, which is the thermal conductive agent.

[0033] It should be noted that the preparation method of the thermal conductive agent of the present invention involves dispersing nano-aluminum nitride in an alcohol solvent, then adding silicate materials, coating the silicate materials onto the surface of aluminum carbide using a liquid-phase method, and finally preparing silica and carbon-coated aluminum nitride materials through high-temperature calcination (under an inert atmosphere). This method, in addition to its advantages of simplicity and controllable coating layer, also possesses hydrophobic (calcined silica is hydrophobic, and the coated aluminum nitride can disperse in water, proving that the thermal conductive agent of the present invention is hydrophobic; otherwise, aluminum nitride would decompose upon contact with water) and synergistic thermal conductivity functions. The present invention modifies aluminum nitride... The surface of aluminum nitride, after high-temperature calcination, is modified with silicon dioxide and carbon materials to form a dense protective layer. On the one hand, the hydrophobicity of silicon dioxide is used to treat the surface of aluminum nitride to avoid the risk of water decomposition. On the other hand, the excellent thermal conductivity of carbon materials can further help improve the thermal conductivity of aluminum nitride, which is significantly different from traditional silicon dioxide surface modification. Compared with traditional aluminum nitride modification, it can achieve uniform carbon and silicon coating in liquid dispersion. On the other hand, it improves the thermal conductivity of aluminum nitride while ensuring environmental protection and hydrophobicity. At the same time, the addition of aluminum nitride thermal conductive agent also improves the wear resistance of the coating.

[0034] In some embodiments, nano-aluminum nitride is dispersed in an alcohol solvent and ultrasonically treated, then silicate ester materials are added, mixed evenly, and dried at 60–120°C to obtain organosilicon-coated aluminum nitride materials.

[0035] In some embodiments, the inert atmosphere includes, but is not limited to, nitrogen, helium, neon, argon, etc.

[0036] In some embodiments, silicate materials include at least one of methyl silicate, ethyl silicate, and propyl silicate.

[0037] Specifically, methyl silicate includes, but is not limited to, tetramethyl orthosilicate (i.e., tetramethyl silicate);

[0038] Ethyl silicate includes, but is not limited to, tetraethyl orthosilicate (i.e., tetraethoxysilane, also known as tetraethyl silicate).

[0039] In some embodiments, the alcohol solvent includes at least one of methanol, ethanol, and glycerol.

[0040] In some embodiments, the calcination temperature is 400–600°C and the calcination time is 3–10 h.

[0041] In some embodiments, the mass-to-volume ratio of nano-aluminum nitride, alcohol solvent, and silicate ester material is (800-1200) g:(400-500) mL:(100-200) mL.

[0042] Specifically, in some embodiments, the particle size of the thermal conductive agent prepared by the present invention is 100-500 nm.

[0043] Based on the same inventive concept, the present invention also provides a method for preparing a thermally conductive and flame-retardant rope, comprising the following steps:

[0044] S1. Disperse the thermally conductive agent prepared by the above preparation method into isocyanate, mix, and obtain the first solution;

[0045] S2. Disperse glycerol and phytic acid in water, mix them, and obtain a second solution;

[0046] S3. The textile rope is passed through the first solution and the second solution in sequence, and then cross-linked and cured to obtain a thermally conductive and flame-retardant rope.

[0047] The preparation method of the thermally conductive and flame-retardant rope of this invention differs from the traditional method of treating textile ropes with thermally conductive agents. It utilizes the reaction of isocyanate with water to form carboxylic acid groups. At high temperature, these carboxylic acid groups undergo a cross-linking reaction with phytic acid and triglycerides. On one hand, the flame-retardant component, phytic acid, is grafted onto the rope through chemical bonds. On the other hand, isocyanate and polyols form an organic coating with a polyurethane-like structure, firmly adhering the modified thermally conductive agent to the textile rope, thus creating a multifunctional material that combines thermal conductivity and flame retardancy. Therefore, this invention has high practical significance and application value.

[0048] In some embodiments, the isocyanate includes at least one of monoisocyanate, diisocyanate, and polyisocyanate.

[0049] Specifically, in some embodiments, the diisocyanate is diphenylmethylene diisocyanate (MDI);

[0050] Monoisocyanates are alkyl monoisocyanates, including but not limited to phenyl isocyanates, dodecyl isocyanates, octadecyl isocyanates, etc.

[0051] The polyisocyanate is polyphenyl polymethylene polyisocyanate (PAPI).

[0052] In some embodiments, the mass-to-volume ratio of the thermal conductive agent to the isocyanate is (150-250) g:(200-400) mL.

[0053] In some embodiments, the mass ratio of glycerol, phytic acid and water in the second solution is (2-1):1:(5-10).

[0054] In some embodiments, a textile rope is passed sequentially through a first solution and a second solution at a rate of 10-50 m / min, and then cross-linked and cured at 100-180°C to obtain a thermally conductive and flame-retardant rope.

[0055] In some embodiments, the material of the textile rope is any one of cotton, polypropylene, nylon, and polyester.

[0056] In some embodiments, the textile rope is passed sequentially through a first solution and a second solution at a rate of 10-50 m / min, and then cross-linked and cured at 100-180°C for 2-3 min to obtain a thermally conductive and flame-retardant rope.

[0057] Specifically, the preparation method of the thermally conductive and flame-retardant rope of this invention firstly involves uniformly coating a silicate ester material onto the surface of aluminum carbide using a liquid-phase method, and then preparing silicon dioxide and carbon-coated aluminum nitride materials through high-temperature calcination (under an inert atmosphere). This method, in addition to its simplicity and controllable coating layer, also possesses hydrophobic and synergistic thermal conductivity functions. Based on this, the textile rope prepared in this application, which combines thermal conductivity and flame retardancy, is formed by chemically cross-linking and curing flame-retardant components phytic acid, glycerol, and isocyanate (after reacting with water) at high temperatures, forming a coating similar to polyurethane material. This allows the thermally conductive modifier to be firmly adhered to the textile rope, resulting in a textile rope that combines thermal conductivity and flame retardancy. On one hand, phytic acid, glycerol, and isocyanate can respectively act as acid, carbon, and nitrogen sources in the flame-retardant elements, while the thermally conductive modifier also plays a physical barrier role in the flame-retardant process. On the other hand, the high-filling-content aluminum nitride modification can improve the thermal conductivity and abrasion resistance of the textile rope.

[0058] The following detailed embodiments further illustrate the preparation methods of the thermally conductive agent and the thermally conductive flame-retardant rope of this application. This section further illustrates the content of the present invention in conjunction with specific embodiments, but should not be construed as limiting the invention. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art. Unless otherwise specified, the reagents, methods, and equipment used in this invention are conventional reagents, methods, and equipment in the art.

[0059] Example 1

[0060] This application provides a method for preparing a thermally conductive agent, comprising the following steps:

[0061] S1. Disperse 1 kg of nano aluminum nitride in 500 mL of ethanol and sonicate for 1 h. Then add 200 mL of tetraethyl orthosilicate and stir evenly. Dry at 80 °C for 12 h to obtain organosilicon-coated aluminum nitride material (the evaporated ethanol can be reused).

[0062] S2. The aluminum nitride material coated with organosilicon in S1 is calcined at 600℃ for 5 hours under nitrogen protection to obtain silicon dioxide and carbon-coated modified aluminum nitride material, which is the thermal conductive agent.

[0063] Example 2

[0064] This application provides a method for preparing a thermally conductive agent, comprising the following steps:

[0065] S1. Disperse 1 kg of nano aluminum nitride in 500 mL of ethanol and sonicate for 1 h. Then add 150 mL of methyl orthosilicate and stir evenly. Dry at 80 °C for 10 h to obtain organosilicon-coated aluminum nitride material (the evaporated ethanol can be reused).

[0066] S2. The aluminum nitride material coated with organosilicon in S1 is calcined at 550°C for 8 hours under nitrogen protection to obtain silicon dioxide and carbon-coated modified aluminum nitride material, which is the thermal conductive agent.

[0067] Example 3

[0068] This application provides a method for preparing a thermally conductive agent, comprising the following steps:

[0069] S1. Disperse 1 kg of nano aluminum nitride in 400 mL of ethanol and sonicate for 1 h. Then add 100 mL of methyl orthosilicate and stir evenly. Dry at 80 °C for 10 h to obtain organosilicon-coated aluminum nitride material (the evaporated ethanol can be reused).

[0070] S2. The aluminum nitride material coated with organosilicon in S1 is calcined at 500°C for 10 hours under nitrogen protection to obtain silicon dioxide and carbon-coated modified aluminum nitride material, which is the thermal conductive agent.

[0071] Example 4

[0072] This application provides a method for preparing a thermally conductive and flame-retardant rope, comprising the following steps:

[0073] S1. Disperse 150g of the thermally conductive agent prepared in Example 1 into 300mL of diphenylmethylene diisocyanate and stir until homogeneous to obtain the first solution;

[0074] S2. Dissolve 500 mL of glycerol and 300 mL of phytic acid in 5 L of water, stir well, and obtain the second solution;

[0075] S3. The textile rope (made of cotton) is passed through the first solution and the second solution at a speed of 20m / min, and then cross-linked and cured in a high-temperature box at 160℃ for 3 minutes before being wound up to obtain a thermally conductive and flame-retardant rope.

[0076] Example 5

[0077] This application provides a method for preparing a thermally conductive and flame-retardant rope, comprising the following steps:

[0078] S1. Disperse 200g of the thermal conductive agent prepared in Example 2 into 300mL of octadecyl monoisocyanate and stir until homogeneous to obtain the first solution;

[0079] S2. Dissolve 400 mL of glycerol and 200 mL of phytic acid in 4 L of water and stir until homogeneous to obtain the second solution;

[0080] S3. Pass the textile rope (made of nylon) through the first solution and the second solution at a speed of 30m / min, then cross-link and cure it in a high-temperature box at 180℃ for 2 minutes before winding it up to obtain a thermally conductive and flame-retardant rope.

[0081] Example 6

[0082] This application provides a method for preparing a thermally conductive and flame-retardant rope, comprising the following steps:

[0083] S1. Disperse 250g of the thermal conductive agent prepared in Example 3 into 300mL of polymethylene polyphenyl polyisocyanate (i.e., polyphenyl polymethylene polyisocyanate (PAPI)) and stir until homogeneous to obtain the first solution;

[0084] S2. Dissolve 400 mL of glycerol and 200 mL of phytic acid in 3 L of water and stir well to obtain the second solution;

[0085] S3. The textile rope (made of polyester) is passed through the first solution and the second solution at a speed of 30m / min, and then cross-linked and cured in a high-temperature box at 180℃ for 2min before being wound up to obtain a thermally conductive and flame-retardant rope.

[0086] Performance testing

[0087] Figure 1 This is a scanning electron microscope image of the thermally conductive agent prepared in Example 1 of the present invention.

[0088] from Figure 1 As can be seen, the thermally conductive modified aluminum nitride material has a size of approximately 500 nm and is uniformly dispersed. The thermally conductive modified aluminum nitride material provided by this invention can be used not only in the field of textile rope materials, but also in composite materials and coatings.

[0089] The thermal conductivity (referring to national standard GB / T11048-2008) and flame retardant properties of the thermally conductive and flame-retardant ropes prepared in Examples 4 to 6, as well as the textile rope (material is cotton) used in step S3 of Example 4, the textile rope (material is nylon) used in step S3 of Example 5, and the textile rope (material is polyester) used in step S3 of Example 6 were tested. The results are shown in Table 1 below.

[0090] Table 1 - Performance of Thermally Conductive and Flame-Retardant Ropes in Different Embodiments

[0091] Example Thermal conductivity W / mK Vertical combustion Oxygen index (%) Thermally conductive and flame-retardant rope in Example 4 5.8 Self-extinguishing 28 In Example 4, the textile rope (made of cotton) 0.05 Burned out 18 Thermally conductive and flame-retardant rope in Example 5 6.7 Self-extinguishing 31 In Example 5, the textile rope (made of nylon) 0.11 Burned out 24 Thermally conductive and flame-retardant rope in Example 6 6.9 Self-extinguishing 32 In Example 6, the textile rope (material is polyester) 0.12 Burned out 25

[0092] As can be seen from Table 1, using the thermally conductive silica and carbon-coated modified aluminum nitride materials prepared in this invention for the treatment of textile ropes gives them excellent thermal conductivity and flame retardant properties, which is a significant advantage.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a thermally conductive and flame-retardant rope, characterized in that, Includes the following steps: The thermally conductive agent is dispersed in isocyanate and mixed to obtain the first solution; Glycerol and phytic acid are dispersed in water and mixed to obtain a second solution; The textile rope is passed through a first solution and a second solution in sequence, and then subjected to cross-linking and curing treatment to obtain a thermally conductive and flame-retardant rope; The method for preparing the thermal conductive agent includes the following steps: Nano-aluminum nitride is dispersed in an alcohol solvent, then silicate ester material is added, mixed evenly, and dried to obtain organosilicon-coated aluminum nitride material; Silicon-coated aluminum nitride is calcined under an inert atmosphere to obtain silicon dioxide and carbon-coated modified aluminum nitride, which is a thermal conductive agent.

2. The method for preparing the thermally conductive and flame-retardant rope as described in claim 1, characterized in that, The isocyanate includes at least one of monoisocyanate, diisocyanate, and polyisocyanate.

3. The method for preparing the thermally conductive and flame-retardant rope as described in claim 1, characterized in that, The mass-to-volume ratio of the thermal conductive agent to the isocyanate is (150-250) g:(200-400) mL.

4. The method for preparing the thermally conductive and flame-retardant rope as described in claim 1, characterized in that, The mass ratio of glycerol, phytic acid, and water in the second solution is (2-1):1:(5-10).

5. The method for preparing the thermally conductive and flame-retardant rope as described in claim 1, characterized in that, The textile rope is passed through the first solution and the second solution sequentially at a speed of 10-50 m / min, and then cross-linked and cured at 100-180℃ to obtain a thermally conductive and flame-retardant rope.

6. The method for preparing the thermally conductive and flame-retardant rope according to any one of claims 1 to 5, characterized in that, The material of the textile rope is any one of cotton, polypropylene, nylon, and polyester.

7. The method for preparing the thermally conductive and flame-retardant rope as described in claim 1, characterized in that, The silicate ester materials include at least one of methyl silicate, ethyl silicate, and propyl silicate. And / or, the alcohol solvent includes at least one of methanol, ethanol, and glycerol.

8. The method for preparing the thermally conductive and flame-retardant rope as described in claim 1, characterized in that, The calcination temperature is 400–600℃, and the calcination time is 3–10 h.

9. The method for preparing the thermally conductive and flame-retardant rope as described in claim 1, characterized in that, The mass-to-volume ratio of the nano-aluminum nitride, alcohol solvent, and silicate ester material is (800-1200) g:(400-500) mL:(100-200) mL.

Images