ABS (acrylonitrile butadiene styrene) plastic particles with high electric conductivity, heat conductivity and flame retardance and preparation method of ABS plastic particles

Abstract

The invention discloses ABS (acrylonitrile-butadiene-styrene) plastic particles with high electric conductivity, heat conductivity and flame retardance and a preparation method of the ABS plastic particles, and belongs to the technical field of preparation of high polymer materials. The plastic particles comprise the following components in parts by weight: 70-85 parts of ABS resin, 1-5 parts of graphene, 10-20 parts of a flame retardant, 2-5 parts of a compatilizer, 3-6 parts of a flexibilizer, 0.1-1 part of an antioxidant and 0.5-2 parts of other auxiliaries. The preparation method comprises the following steps: raw material pretreatment, premixing, melt blending, granulation and cooling, and post-treatment. Through the synergistic effect of the graphene and the halogen-free flame retardant, excellent electrical conductivity, thermal conductivity and flame retardance are achieved under the condition of low graphene addition amount, meanwhile, good mechanical properties are kept, and the material is suitable for the fields of electronic equipment shells, automobile parts and the like requiring high comprehensive performance.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a highly conductive and thermally conductive ABS plastic granule and its preparation method. Background Technology

[0002] ABS is an easily processed thermoplastic polymer with excellent strength and toughness, making it widely used in various fields. With increasingly demanding market requirements, higher demands are being placed on ABS plastics in specific applications, such as high electrical and thermal conductivity, and high flame retardancy. Currently, some technologies have been developed to produce conductive ABS plastics, but these suffer from poor compatibility between graphene and the ABS matrix, leading to unsatisfactory mechanical properties and electrical and thermal conductivity; or the material may have limited functionality and unsatisfactory flame retardancy, restricting its application in conductive and flame-retardant products.

[0003] Furthermore, in industrial production, with the increasing frequency and anti-static properties of electronic devices and the lightweighting of automobiles, the comprehensive performance requirements for plastic materials are becoming increasingly stringent, especially electromagnetic shielding (EMI) efficiency (needing to reach 30-60 dB) and anti-static properties (surface resistivity needing to be below 10). 10 Ω / sq) and high flame retardancy (UL94 V-0 rating).

[0004] Therefore, there is an urgent need to develop an ABS composite material that combines high electrical conductivity, high thermal conductivity, high flame retardancy, and excellent mechanical properties with low filler content. Summary of the Invention

[0005] The purpose of this invention is to provide a highly conductive and thermally conductive ABS plastic granule with high flame retardancy, in order to solve the problem that existing ABS plastic granules do not have electrical conductivity and have poor thermal conductivity and flame retardancy.

[0006] The present invention also aims to provide a method for preparing ABS plastic particles with high electrical and thermal conductivity and high flame retardancy, which can be used to prepare ABS plastic with high electrical and thermal conductivity and high flame retardancy.

[0007] In a first aspect, the present invention provides highly conductive and thermally conductive, highly flame-retardant ABS plastic granules, comprising the following components by weight: 70-85 parts ABS resin, 1-5 parts graphene, 10-20 parts flame retardant, 2-5 parts compatibilizer, 3-6 parts toughening agent, 0.1-1 part antioxidant, and 0.5-2 parts other additives; The graphene is reduced graphene oxide with a specific surface area ≥ 500 m². 2 / g.

[0008] By adopting the above technical solutions and using ABS resin as the base matrix, its excellent processing fluidity and mechanical strength provide good formability and structural support for the composite material; by adding 1 to 5 parts of reduced graphene oxide, its at least 500m 2 The high specific surface area of ​​ / g allows for the rapid formation of a continuous conductive and thermally conductive network within the matrix using nanoscale structures, achieving high-efficiency electrical and thermal conductivity with low addition levels. The flame retardant works synergistically with graphene, both blocking the combustion chain reaction and enhancing flame retardancy efficiency through the physical barrier effect of graphene. The compatibilizer reduces the interfacial tension between graphene and the ABS matrix, inhibiting graphene agglomeration and ensuring the integrity of the conductive and thermally conductive network. The toughening agent compensates for the decrease in toughness caused by filler addition, while antioxidants and other additives respectively delay thermal oxidative degradation during processing, improve processing fluidity and component dispersibility, ultimately achieving a synergistic effect of high electrical and thermal conductivity, high flame retardancy, and excellent mechanical properties.

[0009] Preferably, the ABS resin is of high flow grade, where high flow rate refers to the weight of material flowing out of a specific instrument per unit time.

[0010] Preferably, the reduced graphene oxide has ≤10 layers.

[0011] Preferably, the flame retardant is a halogen-free flame retardant, comprising antimony trioxide and decabromodiphenyl ethane in a mass ratio of 1:(2-5).

[0012] More preferably, the halogen-free flame retardant comprises antimony trioxide and decabromodiphenyl ethane in a mass ratio of 1:3.

[0013] Preferably, the compatibilizer includes maleic anhydride-grafted ABS and polyethylene-grafted maleic anhydride.

[0014] Preferably, the toughening agent includes methyl methacrylate-butadiene-styrene copolymer and acrylate toughening agents.

[0015] Preferably, the antioxidants include antioxidant 1010 and antioxidant 168.

[0016] Preferably, other additives include lubricants and / or dispersants; the lubricant includes calcium stearate; the dispersant includes ethylene bis-stearamide.

[0017] Secondly, the present invention also provides a method for preparing highly conductive and thermally conductive, highly flame-retardant ABS plastic granules, comprising the following steps: S1. Raw material pretreatment; S2. Premixing; S3. Melt blending; S4. Granulation and cooling; S5. Post-treatment.

[0018] Preferably, in step S1, the raw material pretreatment includes drying the graphene, ABS resin, compatibilizer, antioxidant and other additives.

[0019] Preferably, in step S2, the premixing includes: adding ABS resin, graphene, flame retardant, compatibilizer, toughening agent, antioxidant and other additives into a high-speed mixer according to the formula ratio, and mixing at 500-1000 rpm for 10-15 min.

[0020] Preferably, in step S3, melt blending includes: feeding the premixed material into a twin-screw extruder for melt blending, with a processing temperature of 180°C to 220°C, a screw speed of 260 to 360 rpm, and vacuum degassing to remove volatiles.

[0021] Preferably, in step S4, granulation and cooling include: cooling the melt-blended extruded strips through a water bath, and then cutting them into pellets to obtain the desired product.

[0022] The beneficial effects of this invention are: This invention utilizes reduced graphene oxide with a specific surface area and number of layers as a conductive and thermally conductive filler. Its nanosheet structure easily forms a continuous conductive network in the ABS matrix, thereby achieving a surface resistivity as low as 10 even with low addition amounts. 6 It boasts excellent Ω / sq performance. Simultaneously, it employs a halogen-free flame retardant system, which exhibits a synergistic flame-retardant effect with graphene. The layered structure of graphene forms a dense char layer during combustion, isolating oxygen and heat, significantly improving the flame retardant rating to UL94 V-0. Furthermore, the introduction of maleic anhydride-grafted compatibilizers effectively improves the interfacial bonding between graphene and the ABS matrix, preventing filler agglomeration and ensuring that the material's flexural strength, tensile strength, and other mechanical properties are not significantly affected. The addition of toughening agents further compensates for any potential decrease in toughness caused by the introduction of fillers and flame retardants. The overall formulation design is scientific, the process is simple and controllable, suitable for industrial production, and its excellent comprehensive performance demonstrates promising market application prospects. Detailed Implementation

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below.

[0024] A type of highly electrical and thermally conductive, highly flame-retardant ABS plastic granules, comprising the following components by weight: 70-85 parts ABS resin, 1-5 parts graphene, 10-20 parts flame retardant, 2-5 parts compatibilizer, 3-6 parts toughening agent, 0.1-1 part antioxidant, and 0.5-2 parts other additives; The graphene is reduced graphene oxide with a specific surface area ≥ 500 m². 2 / g.

[0025] By adopting the above technical solutions and using ABS resin as the base matrix, its excellent processing fluidity and mechanical strength provide good moldability and structural support for the composite material. By adding 1 to 5 parts of reduced graphene oxide, its high specific surface area and nanoscale structure can quickly form a continuous conductive and thermally conductive network in the matrix, achieving high-efficiency electrical and thermal conductivity with low addition amount. The flame retardant and graphene work synergistically to block the combustion chain reaction and improve the flame retardant efficiency by means of the physical barrier effect of graphene. The compatibilizer can reduce the interfacial tension between graphene and ABS matrix, inhibit graphene agglomeration, and ensure the integrity of the conductive and thermally conductive network. The toughening agent can compensate for the decrease in toughness caused by the addition of fillers, while antioxidants and other additives respectively delay the thermal oxidative degradation during processing, improve processing fluidity and component dispersibility, and ultimately achieve a synergistic effect of high electrical and thermal conductivity, high flame retardancy and excellent mechanical properties.

[0026] In some embodiments, high fluidity refers to the weight of material flowing out of a specific instrument per unit time; selecting high-flow-grade ABS resin can reduce the processing viscosity during melt blending, promote the uniform dispersion of fillers such as graphene and flame retardants, and avoid uneven dispersion caused by excessively high system viscosity.

[0027] In some embodiments, the number of reduced graphene oxide layers is ≤10; controlling the number of reduced graphene oxide layers to within 10 layers ensures its excellent two-dimensional nanosheet properties. Fewer layers mean a higher specific surface area, fewer lattice defects, and superior inherent electrical and thermal conductivity. This thin-layer structure is more easily dispersed by shear forces during melt blending and overlaps more effectively in the ABS matrix, forming a more complete and denser three-dimensional network of electrical and thermal conductivity pathways, thereby achieving higher conductivity and thermal conductivity with lower addition amounts. Simultaneously, the ultrathin sheet structure can migrate more effectively to the material surface during flame retardancy, forming a denser and stronger charcoal protective layer, producing a better synergistic flame retardant effect with the flame retardant. Furthermore, the thin-layer graphene has a larger contact area with the matrix, and with the help of compatibilizers, the interfacial bonding is stronger, which is beneficial for stress transfer and has a smaller negative impact on the mechanical properties of the composite material.

[0028] In some embodiments, the flame retardant is a halogen-free flame retardant, comprising antimony trioxide and decabromodiphenyl ethane in a mass ratio of 1:(2-5); the halogen-free flame retardant comprises antimony trioxide and decabromodiphenyl ethane in a mass ratio of 1:3; antimony trioxide, as a flame retardant synergist, can form a synergistic flame retardant system with decabromodiphenyl ethane. Decabromodiphenyl ethane releases bromine free radicals during combustion to capture active free radicals and inhibit the combustion reaction, while antimony trioxide can promote the formation of a char layer and block the transfer of heat and oxygen. The mass ratio of 1:(2-5) can precisely control the flame retardant efficiency and processing compatibility, with the 1:3 ratio being optimal. This ensures that the material achieves UL94V-0 flame retardancy without causing a decrease in mechanical properties or processing difficulties due to excessive antimony trioxide, and the halogen-free system avoids the release of toxic gases during combustion.

[0029] In some embodiments, the compatibilizer includes maleic anhydride-grafted ABS and polyethylene-grafted maleic anhydride. Maleic anhydride-grafted ABS has excellent compatibility with the ABS matrix, and the grafted maleic anhydride groups can interact with the oxygen-containing functional groups on the graphene surface. Polyethylene-grafted maleic anhydride can enhance the interfacial bonding force between the filler and the matrix. Both compatibilizers can effectively improve the dispersibility of graphene in ABS, reduce agglomeration, ensure the continuity of the conductive and thermally conductive network, and improve the mechanical strength and interfacial stability of the composite material.

[0030] In some embodiments, the toughening agent includes methyl methacrylate-butadiene-styrene copolymer and acrylate toughening agent; both methyl methacrylate-butadiene-styrene copolymer and acrylate toughening agent have a core-shell structure, the elastomer of the core layer can absorb impact energy, and the shell layer has good compatibility with the ABS matrix. It can compensate for the decrease in toughness caused by the addition of rigid fillers such as graphene and flame retardants without affecting the rigidity and processing performance of the material, thereby improving the impact resistance of the composite material and ensuring that it can withstand a certain amount of external impact without breaking in practical applications.

[0031] In some embodiments, the antioxidants include antioxidant 1010 and antioxidant 168; antioxidant 1010 is a hindered phenolic primary antioxidant that can capture free radicals generated during processing and inhibit thermal oxidative degradation; antioxidant 168 is a phosphite auxiliary antioxidant that can decompose hydroperoxides. The synergistic use of the two can form a highly efficient antioxidant system, which can slow down the aging rate of the composite material during melt blending and subsequent use, and maintain the long-term stability of the material properties.

[0032] In some embodiments, other additives include lubricants and / or dispersants; the lubricant includes calcium stearate; the dispersant includes ethylene bis-stearamide; the lubricant calcium stearate can reduce the friction between the molten material and the processing equipment, and improve the processing fluidity; the dispersant ethylene bis-stearamide can reduce the agglomeration force between filler particles and promote the uniform dispersion of graphene and flame retardant in the matrix. The two, used alone or in combination, can further optimize the processing process and product performance, and avoid product defects caused by uneven dispersion or excessive processing resistance.

[0033] A method for preparing highly electrical and thermally conductive, highly flame-retardant ABS plastic granules includes the following steps: S1. Raw material pretreatment; S2. Premixing; S3. Melt blending; S4. Granulation and cooling; S5. Post-treatment.

[0034] By adopting the above technical solutions, the raw material pretreatment removes moisture and volatiles, avoiding defects such as bubbles and pinholes in subsequent processing; premixing achieves preliminary uniform mixing of each component, laying the foundation for melt blending; melt blending further breaks up filler agglomerates with the high shear force of a twin-screw extruder, ensuring uniform dispersion of components; granulation, cooling and post-treatment ensure that the product has regular particle shape and stable performance. The overall process is simple and controllable, and is suitable for large-scale industrial production.

[0035] In some embodiments, in step S1, the raw material pretreatment includes drying graphene, ABS resin, compatibilizer, antioxidant and other additives; the graphene is vacuum dried at 60°C for 4 hours to completely remove the surface-adsorbed moisture, avoiding graphene agglomeration caused by moisture and the generation of bubbles during processing; the ABS resin, compatibilizer, antioxidant and other additives are dried at 80°C for 2 hours to reduce the moisture content in the system and prevent moisture vaporization from affecting the compactness and performance stability of the material during melt blending.

[0036] In some embodiments, in step S2, premixing includes adding ABS resin, graphene, flame retardant, compatibilizer, toughening agent, antioxidant and other additives to a high-speed mixer according to the formulation ratio, and mixing at 500-1000 rpm for 10-15 min. The rotation speed of 500-1000 rpm and the mixing time of 10-15 min can generate suitable shear force and mixing efficiency, which can make the components initially uniformly mixed, and will not cause the graphene structure to be damaged due to excessive rotation speed or excessive time, ensuring that the electrical and thermal conductivity of graphene is not affected, while creating good conditions for the deep dispersion of subsequent melt blending.

[0037] In some embodiments, in step S3, melt blending includes feeding the premixed material into a twin-screw extruder for melt blending, with a processing temperature of 180°C to 220°C and a screw speed of 260 to 360 rpm, followed by vacuum degassing to remove volatiles. The processing temperature range of 180°C to 220°C is adapted to the melting temperature of ABS resin, ensuring complete resin melting while avoiding resin degradation or flame retardant decomposition due to excessively high temperatures. The screw speed of 260 to 360 rpm provides sufficient shear force to break up the agglomerates of graphene and flame retardant, promoting their uniform dispersion. Vacuum degassing effectively removes volatiles from the system, improving the density and mechanical properties of the composite material.

[0038] In some embodiments, in step S4, granulation and cooling include cooling the molten blended extruded strips through a water bath and then cutting them into pellets; water bath cooling can quickly cool the extruded strips to below the glass transition temperature, fix the microstructure of the material, and avoid uneven crystallization or performance fluctuations caused by slow cooling.

[0039] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0040] Example

[0041] Example 1: A type of highly conductive and thermally conductive ABS plastic granules with high flame retardancy was prepared by the following method: S1. Raw material pretreatment: Reduced graphene oxide (specific surface area 800 m²) 2 / g, with 5 to 10 layers) were vacuum dried at 60°C for 4 hours to remove moisture; high-solubility ABS resin, maleic anhydride-grafted ABS, and antioxidant 1010 were dried at 80°C for 2 hours. S2. Premixing: Add 77.5 parts of high-melting-point ABS resin, 1 part of reduced graphene oxide, 15 parts of antimony trioxide flame retardant and decabromodiphenyl ethane in a mass ratio of 1:3, 3 parts of maleic anhydride-grafted ABS, 3 parts of methyl methacrylate-butadiene-styrene copolymer, 0.2 parts of antioxidant 1010, and 0.5 parts of calcium stearate to a high-speed mixer and mix at 600 rpm for 15 minutes to ensure uniform dispersion. S3. Melt blending: The uniformly dispersed material is fed into a twin-screw extruder with a screw diameter of 50 mm and a length-to-diameter ratio of 44:1. Melt blending is carried out at a processing temperature of 200℃ (from the feeding section to the die head) and a screw speed of 300 rpm. Vacuum degassing is performed to remove volatiles. S4. Granulation and cooling: The extruded strips of molten blend are cooled in a water bath and then cut into pellets to obtain composite plastic particles with a particle size of 3mm. S5. Post-processing: Dry the particles at 80℃ for 2 hours, then package and store.

[0042] Example 2: A type of highly conductive and thermally conductive, highly flame-retardant ABS plastic granules was prepared by the following method: S1. Raw material pretreatment: Reduced graphene oxide (specific surface area 800 m²) 2 / g, with 5 to 10 layers) were vacuum dried at 60°C for 4 hours to remove moisture; high-solubility ABS resin, maleic anhydride-grafted ABS, and antioxidant 1010 were dried at 80°C for 2 hours. S2. Premixing: Add 77.5 parts of high-melting-point ABS resin, 5 parts of reduced graphene oxide, 12 parts of antimony trioxide flame retardant and decabromodiphenyl ethane in a mass ratio of 1:3, 3 parts of maleic anhydride-grafted ABS, 4 parts of methyl methacrylate-butadiene-styrene copolymer, 0.2 parts of antioxidant 1010, and 0.5 parts of calcium stearate to a high-speed mixer and mix at 600 rpm for 15 minutes to ensure uniform dispersion. S3. Melt blending: The uniformly dispersed material is fed into a twin-screw extruder with a screw diameter of 50 mm and a length-to-diameter ratio of 44:1. Melt blending is carried out at a processing temperature of 200℃ (from the feeding section to the die head) and a screw speed of 300 rpm. Vacuum degassing is performed to remove volatiles. S4. Granulation and cooling: The extruded strips of molten blend are cooled in a water bath and then cut into pellets to obtain composite plastic particles with a particle size of 3mm. S5. Post-processing: Dry the particles at 80℃ for 2 hours, then package and store.

[0043] Example 3: A type of highly conductive and thermally conductive, highly flame-retardant ABS plastic granules was prepared by the following method: S1. Raw material pretreatment: Reduced graphene oxide (specific surface area 800 m²) 2 / g, with 5 to 10 layers) were vacuum dried at 60°C for 4 hours to remove moisture; high-solubility ABS resin, maleic anhydride-grafted ABS, and antioxidant 1010 were dried at 80°C for 2 hours. S2. Premixing: Add 76 parts of high-melting-point ABS resin, 3.5 parts of reduced graphene oxide, 14 parts of antimony trioxide flame retardant and decabromodiphenyl ethane in a mass ratio of 1:3, 3 parts of maleic anhydride-grafted ABS, 3 parts of methyl methacrylate-butadiene-styrene copolymer, 0.2 parts of antioxidant 1010, and 0.5 parts of calcium stearate to a high-speed mixer and mix at 600 rpm for 15 minutes to ensure uniform dispersion. S3. Melt blending: The uniformly dispersed material is fed into a twin-screw extruder with a screw diameter of 50 mm and a length-to-diameter ratio of 44:1. Melt blending is carried out at a processing temperature of 200℃ (from the feeding section to the die head) and a screw speed of 300 rpm. Vacuum degassing is performed to remove volatiles. S4. Granulation and cooling: The extruded strips of molten blend are cooled in a water bath and then cut into pellets to obtain composite plastic particles with a particle size of 3mm. S5. Post-processing: Dry the particles at 80℃ for 2 hours, then package and store.

[0044] Performance testing: The highly conductive, thermally conductive, and flame-retardant ABS plastic granules prepared in Examples 1 to 3 were subjected to the following tests, and the test results are listed in Table 1: 1. Mechanical properties are tested according to ASTM D790 for bending strength, ASTM D638 for tensile strength, and ASTM D256 for cantilever beam impact strength. 2. Conductivity was tested according to ASTM D257, measuring surface resistivity (using the four-probe method). 3. Flame retardant performance is tested according to UL94 standard for vertical burning rating; 4. Thermal stability was determined by thermogravimetric analysis to test the thermal decomposition temperature.

[0045] Table 1 Performance test results

[0046] The optimal formulation of the ABS plastic granules of this invention is as follows: 76 parts ABS, 3.5 parts graphene, 14 parts flame retardant, 3 parts compatibilizer, 3 parts toughening agent, 0.2 parts antioxidant, and 0.5 parts lubricant. Under this formulation, the performance characteristics are: tensile strength 45 MPa, flexural modulus 3000 Pa, and impact strength 12 kJ / m². 2 Surface resistivity 10 8 With an Ω / sq and UL94 V-0 rating, this product boasts ideal overall performance, meeting the demands of industrial applications. Through special graphene treatment and optimized formulation, this invention successfully resolves the inherent contradictions in the bonding of ABS, graphene, and flame retardants, overcoming the shortcomings of existing plastics. This results in a highly flame-retardant and conductive ABS composite plastic particle with excellent overall performance and controllable production costs. This product can be widely used in specialized fields such as electronic device packaging, instrument housings, workbench mats, and automotive parts.

[0047] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A type of ABS plastic granules with high electrical and thermal conductivity and high flame retardancy, characterized in that, Based on parts by weight, it comprises the following components: 70-85 parts ABS resin, 1-5 parts graphene, 10-20 parts flame retardant, 2-5 parts compatibilizer, 3-6 parts toughening agent, 0.1-1 part antioxidant, and 0.5-2 parts other additives; The graphene is reduced graphene oxide with a specific surface area ≥ 500 m². 2 / g.

2. The highly conductive and thermally conductive, highly flame-retardant ABS plastic granules according to claim 1, characterized in that, The flame retardant is a halogen-free flame retardant, comprising antimony trioxide and decabromodiphenyl ethane in a mass ratio of 1:(2-5).

3. The highly conductive, thermally conductive, and flame-retardant ABS plastic granules according to claim 1, characterized in that, The compatibilizer includes maleic anhydride-grafted ABS and polyethylene-grafted maleic anhydride; the toughening agent includes methyl methacrylate-butadiene-styrene copolymer and acrylate toughening agent.

4. The highly conductive and thermally conductive, highly flame-retardant ABS plastic granules according to claim 1, characterized in that, The antioxidants include antioxidant 1010 and antioxidant 168.

5. The highly conductive, thermally conductive, and flame-retardant ABS plastic granules according to claim 1, characterized in that, The other additives include lubricants and / or dispersants; the lubricant includes calcium stearate; the dispersant includes ethylene bis-stearamide.

6. A method for preparing highly conductive, thermally conductive, and flame-retardant ABS plastic granules, used to prepare the highly conductive, thermally conductive, and flame-retardant ABS plastic granules as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Raw material pretreatment; S2. Premixing; S3. Melt blending; S4. Granulation and cooling; S5. Post-treatment.

7. The method for preparing highly conductive, thermally conductive, and highly flame-retardant ABS plastic granules according to claim 6, characterized in that, In step S1, the raw material pretreatment includes drying the graphene, ABS resin, compatibilizer, antioxidant and other additives.

8. The method for preparing highly conductive, thermally conductive, and flame-retardant ABS plastic granules according to claim 6, characterized in that, In step S2, the premixing includes: adding ABS resin, graphene, flame retardant, compatibilizer, toughening agent, antioxidant and other additives into a high-speed mixer according to the formula ratio, and mixing at 500-1000 rpm for 10-15 min.

9. The method for preparing highly conductive, thermally conductive, and flame-retardant ABS plastic granules according to claim 6, characterized in that, In step S3, the melt blending includes: feeding the premixed material into a twin-screw extruder for melt blending, with a processing temperature of 180℃~220℃, a screw speed of 260~360rpm, and vacuum degassing to remove volatiles.

10. The method for preparing highly conductive, thermally conductive, and flame-retardant ABS plastic granules according to claim 6, characterized in that, In step S4, the granulation and cooling process includes: cooling the molten blended extruded strips through a water bath, and then cutting them into pellets to obtain the final product.

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