Plastic alloy and preparation method thereof and heat conducting member

Abstract

The present application relates to the technical field of polymer materials, and provides a plastic alloy and a preparation method thereof and a heat-conducting part. The plastic alloy includes: spherical heat-conducting fillers, nanosheet heat-conducting fillers, fiber heat-conducting fillers and resins, and the nanosheet heat-conducting fillers include phenolic resin-coated graphene nanosheets. The plastic alloy provided by the present application is added with multi-morphology insulating heat-dissipating fillers, and the fillers of various morphologies cooperate with each other. In the plastic alloy, not only the dispersibility is good, but also the contact between each other is good, which increases the heat dissipation performance. At the same time, the graphene nanosheets coated with phenolic resin increase the contact resistance between the fillers, so that the plastic alloy also has good insulation performance. The plastic alloy of the present invention has good application prospects in the fields of insulating materials and heat-conducting materials.

Description

Technical Field

[0001] The present application belongs to the technical field of polymer materials, and more specifically, relates to a plastic alloy and a preparation method thereof, as well as a heat conducting member. Background Art

[0002] Plastic alloy is a new type of polymer material obtained by physical blending or chemical grafting. Plastic alloy is widely used in automobiles, electronics, precision instruments or some construction, packaging materials and other fields. In the field of consumer electronics, plastic alloy is also widely used. However, some components of consumer electronics have certain requirements on the heat dissipation performance of the material. Usually, the heat dissipation performance of plastic alloy cannot meet the heat dissipation requirements of these components. Therefore, it is necessary to further improve the heat dissipation performance without affecting the insulation performance.

[0003] In the prior art, the method for improving heat dissipation performance mainly includes adding thermally conductive components to plastic alloys, and utilizing the thermally conductive components to disperse in the main components of the plastic alloy to form a thermally conductive network, thereby improving the thermal conductivity of the plastic alloy. However, the current thermally conductive components cannot be evenly dispersed in the plastic alloy, which results in the thermally conductive components being unable to effectively connect with each other to form a network structure in the plastic alloy. The inability of the thermally conductive components to form a thermally conductive network will directly affect the thermal conductivity of the plastic alloy, which makes the plastic alloy subject to certain restrictions in fields with heat dissipation performance or thermal conductivity requirements such as consumer electronics.

[0004] With respect to the above-mentioned related technologies, how to make the thermal conductive components in the plastic alloy effectively interconnected to form a network, thereby improving the thermal conductivity of the plastic alloy has become a technical problem that urgently needs to be solved. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a plastic alloy to solve the technical problem that the thermal conductivity of the current plastic alloy is poor.

[0006] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a plastic alloy, which includes: spherical thermal conductive filler, nanosheet thermal conductive filler, fiber thermal conductive filler and at least two resins.

[0007] In some embodiments, the nanosheet thermally conductive filler includes phenolic resin-coated graphene nanosheets.

[0008] In some embodiments, the spherical thermally conductive filler comprises spherical AlN-Al 2 O 3 Composite materials.

[0009] In some embodiments, the fibrous thermally conductive filler comprises nanodiamond grafted chopped carbon fibers.

[0010] In some embodiments, the average particle size of the spherical thermally conductive filler is 10 μm to 30 μm.

[0011] In some embodiments, the average diameter of the fibrous thermal conductive filler is 6 μm-8 μm, and the length is 100 mm-150 mm.

[0012] In some embodiments, the average particle size of the nanosheet thermally conductive filler is 10 nm to 100 nm.

[0013] In some embodiments, the plastic alloy comprises, by weight: spherical AlN-Al 2 O 3 20-25 parts of composite material, 10-15 parts of phenolic resin coated graphene nanosheets, 5-10 parts of nano-diamond grafted chopped carbon fibers, 40-45 parts of PC and 15-18 parts of ABS.

[0014] In some embodiments, the plastic alloy further comprises, by weight: 2-3 parts of antibacterial agent, 2-3 parts of antioxidant and 2-3 parts of stabilizer.

[0015] Another object of the present application is to provide a method for preparing a plastic alloy, comprising the following steps:

[0016] The spherical heat-conducting filler, the nano-sheet heat-conducting filler, the fiber heat-conducting filler and at least two resins are mixed, and the mixture is melted, blended, extruded and cooled in sequence to obtain a plastic alloy.

[0017] In some embodiments, the spherical thermally conductive filler comprises AlN-Al 2 O 3 Composite material, spherical AlN-Al 2 O 3 The preparation method of the composite material comprises: mixing carbon black and spherical alumina, and sintering them in a nitrogen atmosphere to obtain spherical AlN-Al 2 O 3 Composite materials.

[0018] In some embodiments, the mass ratio of carbon black to spherical alumina is (2-4):1.

[0019] In some embodiments, the sintering temperature is 1500° C.-1700° C., and the sintering holding time is 4-5 h.

[0020] In some embodiments, the heating rate to the sintering temperature is 20-40° C. / min.

[0021] In some embodiments, the nanosheet thermal conductive filler includes phenolic resin coated graphene nanosheets, and the preparation method of the phenolic resin coated graphene nanosheets includes: washing the graphene nanosheets, soaking the graphene nanosheets in a phenolic resin solution, and drying to obtain the phenolic resin coated graphene nanosheets.

[0022] In some embodiments, the phenolic resin solution is a phenolic resin alcohol solution with a concentration of 2 wt % to 7 wt %.

[0023] In some embodiments, the mass ratio of graphene nanosheets to phenolic resin solution is 1:(50-200).

[0024] In some embodiments, the graphene nanosheets are immersed in the phenolic resin solution for 2 hours to 3 hours.

[0025] In some embodiments, the temperature at which the soaked graphene nanosheets are dried is 80°C-90°C.

[0026] In some embodiments, the fiber thermal conductive filler includes nano-diamond grafted chopped carbon fibers, and the preparation method of the nano-diamond grafted chopped carbon fibers includes: placing the chopped carbon fibers in a dimethylformamide solution, adding phenyl isocyanate to mix, and then adding a nano-diamond reaction solution, mixing and reacting, and drying to obtain the nano-diamond grafted chopped carbon fibers.

[0027] In some embodiments, before the chopped carbon fibers are grafted, the chopped carbon fibers are pretreated, and the pretreatment method includes: placing the chopped carbon fibers in a mixed solution of acetone and alcohol, ultrasonically treating them for 0.5h-1.5h, and then keeping them warm at 450℃-550℃ in vacuum for 10min-15min to obtain the pretreated chopped carbon fibers.

[0028] In some embodiments, the concentration of the dimethylformamide solution is 2 wt % to 8 wt %.

[0029] In some embodiments, the mass ratio of the dimethylformamide solution to the chopped carbon fibers is (10-20):1.

[0030] In some embodiments, the mass ratio of phenyl isocyanate to chopped carbon fibers is (2-5):1.

[0031] In some embodiments, the mass ratio of the nanodiamond reaction solution to the chopped carbon fibers is (40-50):1.

[0032] The third object of the present application is to provide a heat conducting member, which comprises the above-mentioned plastic alloy or the plastic alloy prepared by the above-mentioned method for preparing the plastic alloy.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] 1. The present application provides a plastic alloy with high strength, high insulation and high heat dissipation, which uses thermally conductive fillers in various forms, so that the thermally conductive fillers are well dispersed in the plastic alloy, and the overlapping of thermally conductive fillers in different forms is conducive to forming a complex thermal conductive network, thereby improving thermal conductivity;

[0035] 2. In the plastic alloy of the present application, the three forms of thermally conductive fillers interact with each other, which not only improves the electrical conductivity, but also the addition of fiber fillers can bridge other heat dissipation fillers, thereby enhancing the mechanical properties of the plastic alloy.

[0036] 3. The present application also provides a method for preparing a plastic alloy. The plastic alloy prepared by the corresponding method has excellent thermal conductivity.

[0037] 4. The present application also provides a heat conducting component, which adopts the above-mentioned plastic alloy or the plastic alloy prepared by the above-mentioned method and has better thermal conductivity. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] In this application, the term "and / or" describes the association relationship between the exercise objects, and indicates that there can be three relationships. For example, A and / or B can indicate that A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the objects before and after are in an "or" relationship.

[0040] In the present application, "at least one" means one or more, "many" means two or more, and "at least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. It should be understood that in the various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or in sequence, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0041] Unless otherwise defined, all technical terms and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the embodiments of the present invention belong. If the definitions set forth in this section are contrary to or otherwise inconsistent with the definitions set forth in the patents, patent applications, published patent applications, and other publications incorporated herein by reference, the definitions listed in this section take precedence over the definitions incorporated herein by reference.

[0042] In addition, the mass of the relevant components mentioned in the description of the embodiments of the present invention can not only refer to the specific content of each component, but also represent the proportional relationship between the masses of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the description of the embodiments of the present invention, it is within the scope disclosed in the description of the embodiments of the present invention. Specifically, the mass described in the description of the embodiments of the present invention can be a mass unit known in the chemical industry such as μg, mg, g, kg, etc.

[0043] In conventional plastic alloys, thermal conductive fillers generally use ceramic fillers or metal powder fillers with excellent thermal conductivity. Ceramic fillers have good insulation properties and are therefore widely used in plastic alloys with insulation requirements. Ceramic fillers are generally spherical or quasi-spherical fillers. During the mixing process with the resin, on the one hand, due to the difference in material properties between ceramic materials and resin materials, ceramic fillers are easy to agglomerate together. At the same time, the current ceramic fillers are not uniform in shape, the sphericity is not high, and there are uneven protrusions or depressions on the surface. These uneven structural defects and differences in material properties affect the dispersion performance. The decrease in dispersion will result in the inability to form a uniform thermal conductive network between the thermal conductive fillers, further reducing the thermal conductivity of the plastic alloy.

[0044] In order to solve this technical problem, in some embodiments of the present application, a plastic alloy is provided, which includes a spherical thermal conductive filler, a nanosheet thermal conductive filler, a fiber thermal conductive filler and at least two resins.

[0045] In the above implementation manner, the spherical thermally conductive filler has good dispersion performance, the fiber thermally conductive filler can bridge the spherical thermally conductive filler and the nanosheet thermally conductive filler to form a heat conduction path, and the sheet thermally conductive filler has better dispersion than the spherical thermally conductive filler. Benefiting from its larger surface area, the sheet thermally conductive filler provides more contact surfaces on the one hand, so that the fiber fillers have better overlapping performance, and at the same time can further assist the dispersion of the spherical filler and avoid the aggregation of the spherical filler. After the three different forms of thermally conductive fillers are mixed and dispersed with each other, it is easier to form a mutually overlapping heat transfer network structure, thereby improving the thermal conductivity of the plastic alloy.

[0046] In some embodiments, the nanosheet thermally conductive filler includes phenolic resin-coated graphene nanosheets.

[0047] In the above implementation manner, the nanosheet thermal conductive filler uses graphene nanosheets coated with phenolic resin. The phenolic resin has good insulation properties. After being coated with the phenolic resin, the conductive effect brought by the graphene is avoided to a certain extent, and the insulation properties of the plastic alloy are improved. At the same time, the phenolic resin and the main resin material of the plastic alloy are similar, which is more conducive to the uniform dispersion of the graphene nanosheets coated with the phenolic resin in the plastic alloy, thereby improving the thermal conductivity.

[0048] In some embodiments, the spherical thermally conductive filler includes spherical aluminum oxide, spherical boron nitride, spherical zinc oxide, spherical aluminum nitride, and spherical AlN-Al 2 O 3 At least one of the composite materials.

[0049] Spherical thermal conductive fillers have good dispersion properties. In order to further improve the heat transfer effect, several materials with higher thermal conductivity are used, such as spherical boron nitride, spherical zinc oxide, spherical aluminum nitride and spherical AlN-Al 2 O 3 Composite materials, among which spherical AlN-Al 2 O 3 The composite material not only has good dispersion performance and high thermal conductivity, but also has a more regular morphology than conventional spherical aluminum nitride, so the dispersion effect is better.

[0050] In some embodiments, the fibrous thermally conductive filler includes carbon fibers.

[0051] Carbon fiber has good thermal conductivity and mechanical properties.

[0052] In some embodiments, the carbon fiber is nanodiamond-grafted chopped carbon fiber.

[0053] Chopped carbon fiber has better dispersion and is easier to feed.

[0054] In some embodiments, the average diameter of the fiber thermal conductive filler is 6 μm-8 μm, and the length is 100 mm-150 mm. Optionally, the average diameter of the fiber thermal conductive filler is 6 μm, 6.5 μm, 7 μm, 7.5 μm or 8 μm. Optionally, the length of the fiber thermal conductive filler is 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 150 mm.

[0055] In the above implementation, the role of the fiber includes overlapping different fillers to form a more complex heat transfer network and improve the thermal conductivity of the plastic alloy. Secondly, the fiber improves the complexity of the organization in the plastic alloy, forms a fiber structure interwoven in all directions in the organization, and greatly improves the mechanical properties of the plastic alloy. However, the morphology of the fiber determines that it is not easy to disperse during the mixing process. This characteristic of being difficult to disperse is not conducive to improving the thermal conductivity and mechanical properties of the plastic alloy. However, the study found that when the average diameter of the fiber is 6μm-8μm and the length is 100mm-150mm, its dispersion performance and mechanical properties have reached a relatively high level. When the average diameter is too large, its dispersibility is reduced, and when the average diameter is too small, its mechanical properties are reduced, and the thermal conductivity is also reduced; when the fiber length is too long, it is difficult to achieve a good dispersion effect by conventional mixing means, and when the length is too short, the overlapping effect of forming a heat transfer network is reduced, which is not conducive to improving thermal conductivity.

[0056] In some embodiments, the nanosheet thermally conductive filler may also be untreated graphene nanosheets.

[0057] In some embodiments, the average particle size of the spherical thermally conductive filler is 10 μm-30 μm, for example, the average particle size of the spherical thermally conductive filler is 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 22 μm, 25 μm, 27 μm or 30 μm.

[0058] In some embodiments, the average particle size of the nanosheet thermal conductive filler is 10 nm-100 nm, for example, the average particle size of the nanosheet thermal conductive filler is 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm or 100 nm.

[0059] In some embodiments, the resin includes a mixture of at least two of PC, ABS, PVC, PE, PP, PS, PBT, PA, POM, PPO, PTFE, PMMA, and SAN.

[0060] In the above implementation mode:

[0061] PC is the abbreviation of Polycarbonate, which means polycarbonate;

[0062] ABS is the abbreviation of Acrylonitrile butadiene Styrene copolymers, which means acrylonitrile-butadiene-styrene copolymer;

[0063] PVC is the abbreviation of Polyvinyl chloride, which means polyvinyl chloride;

[0064] PE is the abbreviation of polyethylene, which means polyethylene;

[0065] PP is the abbreviation of Polypropylene, which means polypropylene;

[0066] PS is the abbreviation of Polystyrene, which means polystyrene;

[0067] PBT is the abbreviation of polybutylene terephthalate, which means polybutylene terephthalate;

[0068] PA is the abbreviation of Polyamide, which means polyamide;

[0069] POM is the abbreviation of polyformaldehyde, which means polyoxymethylene;

[0070] PPO is the abbreviation of PolyphenyleneOxide, which means polyphenylene oxide;

[0071] PTFE is the abbreviation of Polytetrafluoroethyleneptfe, which means polytetrafluoroethylene;

[0072] PMMA is the abbreviation of polymethyl methacrylate, which means polymethyl methacrylate;

[0073] SAN is the abbreviation of Styrene Acrylonitrile, which means styrene acrylonitrile.

[0074] According to the actual application of plastic alloys, different raw materials can be selected to prepare plastic alloys of different materials.

[0075] In some embodiments, the plastic alloy further includes additives, which include at least one of antibacterial agents, antioxidants, stabilizers, toughening agents, plasticizers, flame retardants, foaming agents, colorants, lubricants, mold release agents, thixotropic agents, reinforcing fillers, impact modifiers, UV absorbers, mildew inhibitors, antistatic agents, wear inhibitors, anti-blocking agents, anti-fogging agents, diluents, solubilizers, fillers, chemical cross-linking agents and coupling agents.

[0076] In some embodiments, the plastic alloy comprises, by weight: spherical AlN-Al 2 O 320-25 parts of composite material, 10-15 parts of phenolic resin coated graphene nanosheets, 5-10 parts of nano-diamond grafted chopped carbon fibers, 40-45 parts of PC and 15-18 parts of ABS. In the above implementation, the amount of spherical heat-conducting filler, nanosheet heat-conducting filler and fiber heat-conducting filler will affect the comprehensive performance of plastic alloy to varying degrees. The increase of spherical heat-conducting filler is easy to produce local aggregation, thereby affecting the uniformity of the overall organization of the alloy, and finally reducing the mechanical properties of the plastic alloy, while the uniformity of thermal conductivity decreases. If the spherical heat-conducting filler is too little, the lap performance between the fiber heat-conducting filler and the nanosheet heat-conducting filler decreases, and the overall thermal conductivity of the plastic alloy is also affected; and when the nanosheet heat-conducting filler is used too much, on the one hand, it will bring about the dispersibility of various forms of heat-conducting fillers to decrease, and at the same time, void defects are very likely to appear in the organization of the plastic alloy, and the mechanical properties are greatly reduced. When the amount of nanosheet heat-conducting filler is too little, it will affect the dispersibility of spherical heat-conducting filler and fiber heat-conducting filler, and the thermal conductivity decreases sharply; when the fiber heat-conducting filler is used too much, the thermal conductivity of the material is improved a lot, but the organizational defects of the plastic alloy are more obvious, and it is not easy to control the mechanical properties. When the material ratio in the above implementation is adopted, the various aspects of the performance of the plastic alloy are all reached to a relatively high level.

[0077] In some embodiments, the plastic alloy further comprises, by weight: 2-3 parts of antibacterial agent, 2-3 parts of antioxidant and 2-3 parts of stabilizer.

[0078] The preparation method of the plastic alloy of the above embodiment comprises the following steps:

[0079] The spherical thermal conductive filler, the nanosheet thermal conductive filler, the fiber thermal conductive filler and the resin are mixed, and then melted, blended, extruded and cooled in sequence to obtain a plastic alloy.

[0080] In some embodiments, the spherical thermal conductive filler comprises spherical AlN-Al 2 O 3 Composite material, the spherical AlN-Al 2 O 3 The preparation method of the composite material comprises the following steps: mixing carbon black and spherical alumina, and sintering them in a nitrogen atmosphere to obtain spherical AlN-Al 2 O 3 Composite materials.

[0081] In some embodiments, spherical AlN-Al 2 O 3 In the raw materials of the composite material, the mass ratio of carbon black to spherical alumina is (2-4): 1. Optionally, the mass ratio of carbon black to spherical alumina is 1:1, 3:1 or 4:1.

[0082] In the above embodiment, after the aluminum oxide is sintered with carbon black in a nitrogen atmosphere, an aluminum nitride shell structure is generated on the surface. 2 O 3 The composite material has better surface properties than conventional aluminum nitride.

[0083] It is easier to disperse and has good thermal conductivity.

[0084] In some embodiments, spherical AlN-Al 2 O 3 The sintering temperature of the composite material is controlled at 1500°C-1700°C, and the sintering and heat preservation time is 4h-5h. 2 O 3 In the process of preparing the composite material, the heating rate to the sintering temperature is 20-40°C / min. In the above embodiment, during the surface sintering process, the oxygen atoms in the aluminum oxide are replaced by nitrogen atoms, which will change the atomic arrangement to a certain extent, thereby affecting the structural morphology. In order to avoid the phase change reaction of the aluminum oxide during the sintering process being too intense, it is necessary to control its heating temperature. When the heating rate is 20-40°C / min, the spherical AlN-Al 2 O 3 The morphology of the composite material is relatively good, and when the sintering temperature is controlled at 1500℃-1700℃, the reaction can remain relatively stable.

[0085] In some embodiments, the fiber thermal conductive filler includes nano-diamond grafted chopped carbon fibers, and the preparation method of the nano-diamond grafted chopped carbon fibers includes: placing the chopped carbon fibers in a dimethylformamide solution, adding phenyl isocyanate and mixing, and then adding a nano-diamond reaction solution, mixing and reacting, and drying to obtain the nano-diamond grafted chopped carbon fibers.

[0086] In the above embodiments, chopped carbon fiber is used as a fiber filler, and its main function is to overlap different fillers to form a more complex heat transfer network. The quality of the overlapping effect depends on the contact between the carbon fiber and the different fillers. Conventional carbon fiber has relatively few reaction sites on the surface, and the overlapping effect is general. Therefore, the present application uses nanodiamonds to graft the carbon fiber to form nanodiamond grafting points on its surface. Diamond has good heat transfer properties, so it can enhance the heat transfer effect of the carbon fiber medium site. At the same time, after the nanodiamond is grafted, the connection sites of the carbon fiber are improved, thereby further increasing the number of overlapping sites.

[0087] In some embodiments, before the chopped carbon fibers are subjected to grafting modification treatment, the process further includes: pre-treating the chopped carbon fibers, wherein the pre-treatment method includes: placing the chopped carbon fibers in a mixture of acetone and alcohol for ultrasonic treatment, and then heating and heat-insulating the ultrasonically treated chopped carbon fibers in a vacuum environment to obtain pre-treated chopped carbon fibers.

[0088] In the above implementation, impurities may exist on the surface of the carbon fiber, thereby consuming the nanodiamonds for grafting. In order to improve the effectiveness of grafting, the chopped carbon fiber is cleaned before the grafting reaction to improve the effectiveness of grafting.

[0089] In some embodiments, the time of ultrasonic treatment of chopped carbon fiber is 0.5h-1.5h, the vacuum heating temperature is 450℃-550℃, and the holding time is 10min-15min. In some embodiments, the concentration of dimethylformamide solution is 2wt%-8wt%. Optionally, the concentration of dimethylformamide solution is 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt% or 8wt%.

[0090] In some embodiments, the mass ratio of the dimethylformamide solution to the chopped carbon fibers is (10-20): 1. Alternatively, the mass ratio of the dimethylformamide solution to the chopped carbon fibers is 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1 or 20:1.

[0091] In some embodiments, the mass ratio of phenyl isocyanate to chopped carbon fibers is (2-5): 1. Alternatively, the mass ratio of phenyl isocyanate to chopped carbon fibers is 2:1, 3:1, 4:1 or 5:1.

[0092] In some embodiments, the mass ratio of the nanodiamond reaction solution to the chopped carbon fiber is (40-50): 1. Alternatively, the mass ratio of the nanodiamond reaction solution to the chopped carbon fiber is 40: 1, 41: 1, 42: 1, 43: 1, 44: 1, 45: 1, 46: 1, 47: 1, 48: 1, 49: 1 or 50: 1.

[0093] In some embodiments, the nanosheet thermal conductive filler includes phenolic resin-coated graphene nanosheets, and the preparation method of the phenolic resin-coated graphene nanosheets includes the following steps: washing the graphene nanosheets, soaking the graphene nanosheets in a phenolic resin solution, and drying to obtain the phenolic resin-coated graphene nanosheets.

[0094] In some embodiments, the phenolic resin solution is a phenolic resin alcohol solution with a concentration of 2wt%-7wt%. Optionally, the concentration of the phenolic resin alcohol solution is 2wt%, 3wt%, 4wt%, 5wt%, 6wt% or 7wt%.

[0095] In some embodiments, the mass ratio of graphene nanosheets to phenolic resin solution is 1:(50-200). Optionally, the mass ratio of graphene nanosheets to phenolic resin solution is 1:50, 1:100, 1:150 or 1:200.

[0096] In some embodiments, the graphene nanosheets are immersed in the phenolic resin solution for 2 hours to 3 hours.

[0097] In some embodiments, the temperature at which the soaked graphene nanosheets are dried is 80°C-90°C.

[0098] The following is explained in conjunction with specific embodiments:

[0099] Example 1

[0100] A method for preparing a PC / ABS plastic alloy comprises the following steps:

[0101] S11, spherical AlN-Al 2 O 3 Composite material preparation: Carbon black and spherical alumina with an average particle size of 20 μm were mixed in a mass ratio of 3:1, placed in an atmosphere furnace and sintered in a nitrogen atmosphere, heated to 1600°C at 30°C / min, kept warm for 4 hours, and then cooled to room temperature to obtain spherical AlN-Al 2 O 3 Composite materials.

[0102] S12. Preparation of nano-diamond grafted chopped carbon fibers: put chopped carbon fibers with an average diameter of 7 μm and a length of 120 mm into an acetone-alcohol mixed solution, ultrasonically treat for 1 hour, filter out and then heat-treat at 500°C in a vacuum for 10 minutes to obtain pretreated carbon fibers, put one part of the pretreated carbon fibers into 10 parts of dimethylformamide solution with a concentration of 5wt%, add 2 parts of phenyl isocyanate while stirring, heat to 45°C, heat and stir for 10 hours, then add 40 parts of an aqueous dispersion of nano-diamonds, maintain at 45°C, heat and stir for 8 hours, then filter and dry to obtain nano-diamond grafted chopped carbon fibers.

[0103] S13. Preparation of phenolic resin-coated graphene nanosheets: ultrasonically treat the graphene nanosheets in acetone for 10 minutes, dry the graphene nanosheets after treatment, soak 1 part of the dried graphene nanosheets in 100 parts of 5wt% phenolic resin alcohol solution for 2 hours, and then place the phenolic resin alcohol solution soaked with the graphene nanosheets in a constant temperature drying oven at 85°C and dry them to obtain phenolic resin-coated graphene nanosheets.

[0104] S14, 20 parts of spherical AlN-Al 2 O 3 The composite material, 10 parts of phenolic resin-coated graphene nanosheets and 5 parts of nano-diamond grafted chopped carbon fibers were added to a high-speed mixer and mixed for 2 hours. Then, 40 parts of PC, 15 parts of ABS, 2 parts of antibacterial agents, 2 parts of antioxidants and 2 parts of stabilizers were added. After continuing to mix for 2 hours, a twin-screw extruder was used for melting, blending, extrusion, cooling and pelletizing to obtain a PC / ABS plastic alloy.

[0105] Example 2

[0106] A method for preparing a PC / ABS plastic alloy comprises the following steps:

[0107] S11, spherical AlN-Al 2 O 3 Composite material preparation: Carbon black and spherical alumina with an average particle size of 20 μm were mixed in a mass ratio of 3:1, placed in an atmosphere furnace and sintered in a nitrogen atmosphere, heated to 1600°C at 30°C / min, kept warm for 4 hours, and then cooled to room temperature to obtain spherical AlN-Al 2 O 3 Composite materials.

[0108] S12. Preparation of phenolic resin-coated graphene nanosheets: ultrasonically treat the graphene nanosheets in acetone for 10 minutes, dry the graphene nanosheets after treatment, soak 1 part of the dried graphene nanosheets in 100 parts of 5wt% phenolic resin alcohol solution for 2 hours, and then place the phenolic resin alcohol solution soaked with the graphene nanosheets in a constant temperature drying oven at 85°C and dry them to obtain phenolic resin-coated graphene nanosheets.

[0109] S13, 25 parts of AlN-Al with an average particle size of 20 μm 2 O 3The composite material, 15 parts of phenolic resin-coated graphene nanosheets and 10 parts of chopped carbon fibers with an average diameter of 7 μm and a length of 120 mm were added to a high-speed mixer and mixed for 2 hours. Then, 45 parts of PC, 18 parts of ABS, 3 parts of antibacterial agents, 3 parts of antioxidants and 3 parts of stabilizers were added. After continuing to mix for 2 hours, a twin-screw extruder was used for melting, blending, extrusion, cooling and pelletizing to obtain a PC / ABS plastic alloy.

[0110] Example 3

[0111] A method for preparing a PC / ABS plastic alloy comprises the following steps:

[0112] S11, spherical AlN-Al 2 O 3 Composite material preparation: Carbon black and spherical alumina with an average particle size of 20 μm were mixed in a mass ratio of 3:1, placed in an atmosphere furnace and sintered in a nitrogen atmosphere, heated to 1600°C at 30°C / min, kept warm for 4 hours, and then cooled to room temperature to obtain spherical AlN-Al 2 O 3 Composite materials.

[0113] S12. Preparation of nano-diamond grafted chopped carbon fibers: put chopped carbon fibers with an average diameter of 7 μm and a length of 120 mm into an acetone-alcohol mixed solution, ultrasonically treat for 1 hour, filter out and then heat-treat at 500°C in a vacuum for 10 minutes to obtain pretreated carbon fibers, put one part of the pretreated carbon fibers into 10 parts of dimethylformamide solution with a concentration of 5wt%, add 2 parts of phenyl isocyanate while stirring, heat to 45°C, heat and stir for 10 hours, then add 40 parts of an aqueous dispersion of nano-diamonds, maintain at 45°C, heat and stir for 8 hours, then filter and dry to obtain nano-diamond grafted chopped carbon fibers.

[0114] S13. Preparation of phenolic resin-coated graphene nanosheets: ultrasonically treat the graphene nanosheets in acetone for 10 minutes, dry the graphene nanosheets after treatment, soak one portion of the dried graphene nanosheets in 50 portions of 5 wt% phenolic resin alcohol solution for 2 hours, and then place the phenolic resin alcohol solution soaked with the graphene nanosheets in a constant temperature drying oven at 85°C and dry them to obtain phenolic resin-coated graphene nanosheets.

[0115] S14, 25 parts of spherical AlN-Al 2 O 3The composite material, 15 parts of phenolic resin-coated graphene nanosheets and 10 parts of nano-diamond grafted chopped carbon fibers were added to a high-speed mixer and mixed for 2 hours. Then, 45 parts of PC, 18 parts of ABS, 3 parts of antibacterial agents, 3 parts of antioxidants and 3 parts of stabilizers were added. After continuing to mix for 2 hours, a twin-screw extruder was used for melting, blending, extrusion, cooling and pelletizing to obtain a PC / ABS plastic alloy.

[0116] Example 4

[0117] A method for preparing a PC / ABS plastic alloy comprises the following steps:

[0118] S11, spherical AlN-Al 2 O 3 Composite material preparation: Carbon black and spherical alumina with an average particle size of 20 μm were mixed in a mass ratio of 3:1, placed in an atmosphere furnace and sintered in a nitrogen atmosphere, heated to 1600°C at 30°C / min, kept warm for 4 hours, and then cooled to room temperature to obtain spherical AlN-Al 2 O 3 Composite materials.

[0119] S12. Preparation of nano-diamond grafted chopped carbon fibers: put chopped carbon fibers with an average diameter of 7 μm and a length of 120 mm into an acetone-alcohol mixed solution, ultrasonically treat for 1 hour, filter and take out, and then vacuum-treat at 500°C for 10 minutes to obtain pretreated carbon fibers. Put one part of the pretreated carbon fibers into 10 parts of dimethylformamide solution with a concentration of 2wt%, add 2 parts of phenyl isocyanate while stirring, heat to 45°C, and keep warm and stirred for 10 hours, then add 40 parts of an aqueous dispersion of nano-diamonds, maintain at 45°C, keep warm and stirred for 8 hours, then filter and dry to obtain nano-diamond grafted chopped carbon fibers.

[0120] S13. Preparation of phenolic resin-coated graphene nanosheets: ultrasonically treat the graphene nanosheets in acetone for 10 minutes, dry the graphene nanosheets after treatment, soak one portion of the dried graphene nanosheets in 200 portions of 7wt% phenolic resin alcohol solution for 2 hours, and then place the phenolic resin alcohol solution soaked with the graphene nanosheets in a constant temperature drying oven at 85°C and dry them to obtain phenolic resin-coated graphene nanosheets.

[0121] S14, 25 parts of spherical AlN-Al 2 O 3The composite material, 15 parts of phenolic resin-coated graphene nanosheets and 10 parts of nano-diamond grafted chopped carbon fibers were added to a high-speed mixer and mixed for 2 hours. Then, 45 parts of PC, 18 parts of ABS, 3 parts of antibacterial agents, 3 parts of antioxidants and 3 parts of stabilizers were added. After continuing to mix for 2 hours, a twin-screw extruder was used for melting, blending, extrusion, cooling and pelletizing to obtain a PC / ABS plastic alloy.

[0122] Example 5

[0123] A method for preparing a PC / ABS plastic alloy comprises the following steps:

[0124] S11, spherical AlN-Al 2 O 3 Composite material preparation: Carbon black and spherical alumina with an average particle size of 20 μm were mixed in a mass ratio of 3:1, placed in an atmosphere furnace and sintered in a nitrogen atmosphere, heated to 1600°C at 30°C / min, kept warm for 4 hours, and then cooled to room temperature to obtain spherical AlN-Al 2 O 3 Composite materials.

[0125] S12. Preparation of nano-diamond grafted chopped carbon fibers: put chopped carbon fibers with an average diameter of 7 μm and a length of 120 mm into an acetone-alcohol mixed solution, ultrasonically treat for 1 hour, filter out and then heat-treat at 500°C in a vacuum for 10 minutes to obtain pretreated carbon fibers, put one part of the pretreated carbon fibers into 10 parts of dimethylformamide solution with a concentration of 5wt%, add 2 parts of phenyl isocyanate while stirring, heat to 45°C, heat and stir for 10 hours, then add 40 parts of an aqueous dispersion of nano-diamonds, maintain at 45°C, heat and stir for 8 hours, then filter and dry to obtain nano-diamond grafted chopped carbon fibers.

[0126] S13. Preparation of phenolic resin-coated graphene nanosheets: ultrasonically treat the graphene nanosheets in acetone for 10 minutes, dry the graphene nanosheets after treatment, soak 1 part of the dried graphene nanosheets in 100 parts of 5wt% phenolic resin alcohol solution for 2 hours, and then place the phenolic resin alcohol solution soaked with the graphene nanosheets in a constant temperature drying oven at 85°C and dry them to obtain phenolic resin-coated graphene nanosheets.

[0127] S14, 22 parts of spherical AlN-Al 2 O 3The composite material, 12 parts of phenolic resin-coated graphene nanosheets and 8 parts of nano-diamond grafted chopped carbon fibers were added to a high-speed mixer and mixed for 2 hours. Then, 43 parts of PC, 17 parts of ABS, 2 parts of antibacterial agents, 3 parts of antioxidants and 3 parts of stabilizers were added. After continuing to mix for 2 hours, a twin-screw extruder was used for melting, blending, extrusion, cooling and pelletizing to obtain a PC / ABS plastic alloy.

[0128] Example 6

[0129] A method for preparing a PC / ABS plastic alloy comprises the following steps:

[0130] S11, spherical AlN-Al 2 O 3 Composite material preparation: Carbon black and spherical alumina with an average particle size of 20 μm were mixed in a mass ratio of 3:1, placed in an atmosphere furnace and sintered in a nitrogen atmosphere, heated to 1600°C at 30°C / min, kept warm for 4 hours, and then cooled to room temperature to obtain spherical AlN-Al 2 O 3 Composite materials.

[0131] S12. Preparation of nano-diamond grafted chopped carbon fibers: put chopped carbon fibers with an average diameter of 7 μm and a length of 120 mm into an acetone-alcohol mixed solution, ultrasonically treat for 1 hour, filter out and then heat-treat at 500°C in a vacuum for 10 minutes to obtain pretreated carbon fibers, put one part of the pretreated carbon fibers into 10 parts of dimethylformamide solution with a concentration of 5wt%, add 2 parts of phenyl isocyanate while stirring, heat to 45°C, heat and stir for 10 hours, then add 40 parts of an aqueous dispersion of nano-diamonds, maintain at 45°C, heat and stir for 8 hours, then filter and dry to obtain nano-diamond grafted chopped carbon fibers.

[0132] S13. Preparation of phenolic resin-coated graphene nanosheets: ultrasonically treat the graphene nanosheets in acetone for 10 minutes, dry the graphene nanosheets after treatment, soak 1 part of the dried graphene nanosheets in 100 parts of 5wt% phenolic resin alcohol solution for 2 hours, and then place the phenolic resin alcohol solution soaked with the graphene nanosheets in a constant temperature drying oven at 85°C and dry them to obtain phenolic resin-coated graphene nanosheets.

[0133] S14, 25 parts of spherical AlN-Al 2 O 3The composite material, 15 parts of phenolic resin-coated graphene nanosheets and 10 parts of nano-diamond grafted chopped carbon fibers were added to a high-speed mixer and mixed for 2 hours. Then, 45 parts of PC, 18 parts of ABS, 3 parts of antibacterial agents, 3 parts of antioxidants and 3 parts of stabilizers were added. After continuing to mix for 2 hours, a twin-screw extruder was used for melting, blending, extrusion, cooling and pelletizing to obtain a PC / ABS plastic alloy.

[0134] Example 7

[0135] A method for preparing a PC / ABS plastic alloy comprises the following steps:

[0136] S11, spherical AlN-Al 2 O 3 Composite material preparation: Carbon black and spherical alumina with an average particle size of 20 μm were mixed in a mass ratio of 3:1, placed in an atmosphere furnace and sintered in a nitrogen atmosphere, heated to 1600°C at 30°C / min, kept warm for 4 hours, and then cooled to room temperature to obtain spherical AlN-Al 2 O 3 Composite materials.

[0137] S12. Preparation of nano-diamond grafted chopped carbon fibers: Place 1 part of chopped carbon fibers with an average diameter of 7 μm and a length of 120 mm into 10 parts of dimethylformamide solution with a concentration of 5 wt%, add 2 parts of phenyl isocyanate while stirring, heat to 45°C, keep warm and stir for 10 hours, then add 40 parts of an aqueous dispersion of nano-diamonds, maintain 45°C, keep warm and stir for 8 hours, then filter and dry to obtain the nano-diamond grafted chopped carbon fibers.

[0138] S13. Preparation of phenolic resin-coated graphene nanosheets: ultrasonically treat the graphene nanosheets in acetone for 10 minutes, dry the graphene nanosheets after treatment, soak 1 part of the dried graphene nanosheets in 100 parts of 5wt% phenolic resin alcohol solution for 2 hours, and then place the phenolic resin alcohol solution soaked with the graphene nanosheets in a constant temperature drying oven at 85°C and dry them to obtain phenolic resin-coated graphene nanosheets.

[0139] S14, 20 parts of spherical AlN-Al 2 O 3 The composite material, 10 parts of phenolic resin-coated graphene nanosheets and 5 parts of nano-diamond grafted chopped carbon fibers were added to a high-speed mixer and mixed for 2 hours. Then, 40 parts of PC, 15 parts of ABS, 2 parts of antibacterial agents, 2 parts of antioxidants and 2 parts of stabilizers were added. After continuing to mix for 2 hours, a twin-screw extruder was used for melting, blending, extrusion, cooling and pelletizing to obtain a PC / ABS plastic alloy.

[0140] Example 8

[0141] A method for preparing a PC / ABS plastic alloy comprises the following steps:

[0142] S11, spherical AlN-Al 2 O 3 Composite material preparation: Carbon black and spherical alumina with an average particle size of 20 μm were mixed in a mass ratio of 3:1, placed in an atmosphere furnace and sintered in a nitrogen atmosphere, heated to 1600°C at 30°C / min, kept warm for 4 hours, and then cooled to room temperature to obtain spherical AlN-Al 2 O 3 Composite materials.

[0143] S12. Preparation of nano-diamond grafted chopped carbon fibers: put chopped carbon fibers with an average diameter of 7 μm and a length of 120 mm into an acetone-alcohol mixed solution, ultrasonically treat for 1 hour, filter out and then heat-treat at 500°C in a vacuum for 10 minutes to obtain pretreated carbon fibers, put one part of the pretreated carbon fibers into 10 parts of dimethylformamide solution with a concentration of 5wt%, add 2 parts of phenyl isocyanate while stirring, heat to 45°C, heat and stir for 10 hours, then add 40 parts of an aqueous dispersion of nano-diamonds, maintain at 45°C, heat and stir for 8 hours, then filter and dry to obtain nano-diamond grafted chopped carbon fibers.

[0144] S13, 22 parts of spherical AlN-Al 2 O 3 The composite material, 12 parts of graphene nanosheets and 8 parts of nano-diamond grafted chopped carbon fibers were added to a high-speed mixer and mixed for 2 hours. Then, 43 parts of PC, 17 parts of ABS, 2 parts of antibacterial agents, 3 parts of antioxidants and 3 parts of stabilizers were added and mixed for 2 hours. Then, a twin-screw extruder was used for melting, blending, extrusion, cooling and pelletizing to obtain a PC / ABS plastic alloy.

[0145] Comparative Example 1

[0146] A method for preparing a PC / ABS plastic alloy comprises the following steps:

[0147] S11. Preparation of nano-diamond grafted chopped carbon fibers: put chopped carbon fibers with an average diameter of 7 μm and a length of 120 mm into an acetone-alcohol mixed solution, ultrasonically treat for 1 hour, filter out and then heat-treat at 500°C in vacuum for 10 minutes to obtain pretreated carbon fibers, put one part of the pretreated carbon fibers into 10 parts of dimethylformamide solution with a concentration of 5wt%, add 2 parts of phenyl isocyanate while stirring, heat to 45°C, heat and stir for 10 hours, then add 40 parts of an aqueous dispersion of nano-diamonds, maintain at 45°C, heat and stir for 8 hours, then filter and dry to obtain nano-diamond grafted chopped carbon fibers.

[0148] S12. Preparation of phenolic resin-coated graphene nanosheets: ultrasonically treat the graphene nanosheets in acetone for 10 minutes, dry the graphene nanosheets after treatment, soak 1 part of the dried graphene nanosheets in 100 parts of 5wt% phenolic resin alcohol solution for 2 hours, and then place the phenolic resin alcohol solution soaked with the graphene nanosheets in a constant temperature drying oven at 85°C and dry them to obtain phenolic resin-coated graphene nanosheets.

[0149] S13, 10 parts of phenolic resin-coated graphene nanosheets and 5 parts of nano-diamond grafted chopped carbon fibers were added to a high-speed mixer and mixed for 2 hours, and then 40 parts of PC, 14 parts of ABS, 2 parts of antibacterial agents, 2 parts of antioxidants and 2 parts of stabilizers were added. After continuing to mix for 2 hours, a twin-screw extruder was used for melting, blending, extrusion, cooling and pelletizing to obtain a PC / ABS plastic alloy.

[0150] Comparative Example 2

[0151] A method for preparing a PC / ABS plastic alloy comprises the following steps:

[0152] S11, spherical AlN-Al 2 O 3 Composite material preparation: Carbon black and spherical alumina with an average particle size of 20 μm were mixed in a mass ratio of 3:1, placed in an atmosphere furnace and sintered in a nitrogen atmosphere, heated to 1600°C at 30°C / min, kept warm for 4 hours, and then cooled to room temperature to obtain spherical AlN-Al 2 O 3 Composite materials.

[0153] S12. Preparation of nano-diamond grafted chopped carbon fibers: put chopped carbon fibers with an average diameter of 7 μm and a length of 120 mm into an acetone-alcohol mixed solution, ultrasonically treat for 1 hour, filter out and then heat-treat at 500°C in a vacuum for 10 minutes to obtain pretreated carbon fibers, put one part of the pretreated carbon fibers into 10 parts of dimethylformamide solution with a concentration of 5wt%, add 2 parts of phenyl isocyanate while stirring, heat to 45°C, heat and stir for 10 hours, then add 40 parts of an aqueous dispersion of nano-diamonds, maintain at 45°C, heat and stir for 8 hours, then filter and dry to obtain nano-diamond grafted chopped carbon fibers.

[0154] S13, 20 parts of spherical AlN-Al 2 O 3The composite material and 5 parts of nano-diamond grafted chopped carbon fibers were added to a high-speed mixer and mixed for 2 hours, and then 40 parts of PC, 15 parts of ABS, 2 parts of antibacterial agents, 2 parts of antioxidants and 2 parts of stabilizers were added. After continuing to mix for 2 hours, a twin-screw extruder was used for melting, blending, extrusion, cooling and pelletizing to obtain a PC / ABS plastic alloy.

[0155] Comparative Example 3

[0156] A method for preparing a PC / ABS plastic alloy comprises the following steps:

[0157] S11, spherical AlN-Al 2 O 3 Composite material preparation: Carbon black and spherical alumina with an average particle size of 20 μm were mixed in a mass ratio of 3:1, placed in an atmosphere furnace and sintered in a nitrogen atmosphere, heated to 1600°C at 30°C / min, kept warm for 4 hours, and then cooled to room temperature to obtain spherical AlN-Al 2 O 3 Composite materials.

[0158] S12. Preparation of phenolic resin-coated graphene nanosheets: ultrasonically treat the graphene nanosheets in acetone for 10 minutes, dry the graphene nanosheets after treatment, soak 1 part of the dried graphene nanosheets in 100 parts of 5wt% phenolic resin alcohol solution for 2 hours, and then place the phenolic resin alcohol solution soaked with the graphene nanosheets in a constant temperature drying oven at 85°C and dry them to obtain phenolic resin-coated graphene nanosheets.

[0159] S13, 20 parts of spherical AlN-Al 2 O 3 The composite material and 10 parts of phenolic resin-coated graphene nanosheets were added to a high-speed mixer and mixed for 2 hours, and then 40 parts of PC, 14 parts of ABS, 2 parts of antibacterial agent, 2 parts of antioxidant and 2 parts of stabilizer were added. After continuing to mix for 2 hours, a twin-screw extruder was used for melting, blending, extrusion, cooling and pelletizing to obtain PC / ABS plastic alloy.

[0160] Comparative Example 4

[0161] Commercially available PC / ABS plastic alloy is used.

[0162] The PC / ABS plastic alloys prepared in the above examples and comparative examples were respectively subjected to thermal conductivity tests, volume resistance tests and tensile strength tests.

[0163] Thermal conductivity test method is carried out according to ASTM-D5470 GB / T 1410-2006PS1;

[0164] The volume resistivity is determined according to GB / T 1410-2006.

[0165] The tensile strength was measured according to ASTM D638.

[0166] The test results are shown in the following table:

[0167]

[0168] The factors that affect the thermal conductivity of plastic alloys mainly include:

[0169] 1. Dispersibility of thermal conductive fillers dispersed in plastic alloys;

[0170] 2. The overlapping effect between each thermal conductive filler, that is, whether it can form a complex connection network;

[0171] 3. The thermal conductivity of the thermal conductive filler itself.

[0172] Good dispersibility may cause the overlap effect to deteriorate, as can be seen from the above test result data, the plastic alloy adopting fiber heat-conducting filler, nano sheet heat-conducting filler and spherical heat-conducting filler simultaneously, compared with the plastic alloy not adopting three kinds of heat-conducting fillers of different forms simultaneously, thermal conductivity has been significantly improved, spherical heat-conducting filler is conducive to be evenly dispersed, sheet heat-conducting filler and fiber heat-conducting filler all have good specific surface area, and sheet heat-conducting filler provides more contact sites on the plane, is conducive to the overlap at both ends of fiber, spherical heat-conducting filler is conducive to the overlap between fiber and fiber, therefore, three kinds of heat-conducting fillers cooperate with each other, can reach good dispersibility, can improve overlap performance again. The application has adopted the graphene nano sheet coated with phenolic resin simultaneously, can not only obtain good thermal conductivity, but also has large volume resistance simultaneously. In the technical field of electronic products or other needs to use insulating material or heat-insulating material, plastic alloy of the present invention all has good application prospects.

[0173] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A plastic alloy, characterized in that: The plastic alloy comprises: spherical heat-conducting filler, nanosheet heat-conducting filler, fiber heat-conducting filler and at least two resins; the spherical heat-conducting filler comprises a spherical AlN-Al2O3 composite material; The fiber thermal conductive filler includes nano-diamond grafted chopped carbon fibers; The nanosheet heat-conducting filler comprises graphene nanosheets coated with phenolic resin; the plastic alloy comprises: 20-25 parts of spherical AlN-Al2O3 composite material, 10-15 parts of phenolic resin-coated graphene nanosheets, 5-10 parts of nano-diamond grafted chopped carbon fibers, 40-45 parts of PC and 15-18 parts of ABS; The average particle size of the spherical thermal conductive filler is 10 μm-30 μm.

2. The plastic alloy according to claim 1, characterized in that The average diameter of the fiber thermal conductive filler is 6 μm-8 μm, and the length is 100 mm-150 mm; and / or, The average particle size of the nanosheet thermal conductive filler is 10nm-100nm.

3. The method for preparing a plastic alloy as claimed in claim 1 or 2, characterized in that: The preparation method comprises the following steps: The spherical heat-conducting filler, the nano-sheet heat-conducting filler, the fiber heat-conducting filler and at least two resins are mixed, and the mixture is melted, blended, extruded and cooled in sequence to obtain a plastic alloy.

4. The method for preparing a plastic alloy as claimed in claim 3, characterized in that: The nanosheet thermal conductive filler comprises phenolic resin coated graphene nanosheets, and the preparation method of the phenolic resin coated graphene nanosheets comprises: washing the graphene nanosheets, soaking the graphene nanosheets in a phenolic resin solution, and drying to obtain the phenolic resin coated graphene nanosheets.

5. The method for preparing a plastic alloy as claimed in claim 4, characterized in that: The phenolic resin solution is a phenolic resin alcohol solution with a concentration of 2wt%-7wt%; and / or, The mass ratio of the graphene nanosheets to the phenolic resin solution is 1:(50-200).

6. The method for preparing a plastic alloy as claimed in claim 3, characterized in that: The spherical thermal conductive filler comprises a spherical AlN-Al2O3 composite material. The preparation method of the spherical AlN-Al2O3 composite material comprises: mixing carbon black and spherical alumina, and sintering them in a nitrogen atmosphere to obtain the spherical AlN-Al2O3 composite material.

7. The method for preparing a plastic alloy as claimed in claim 3, characterized in that: The fiber thermal conductive filler comprises nano-diamond grafted chopped carbon fibers. The preparation method of the nano-diamond grafted chopped carbon fibers comprises: placing the chopped carbon fibers in a dimethylformamide solution, wherein the concentration of the dimethylformamide solution is 2wt%-8wt%, and the mass ratio of the dimethylformamide solution to the chopped carbon fibers is (10-20):1; adding phenyl isocyanate to mix, wherein the mass ratio of the phenyl isocyanate to the chopped carbon fibers is (2-5):1; then adding a nano-diamond reaction solution to mix, wherein the mass ratio of the nano-diamond reaction solution to the chopped carbon fibers is (40-50):1; after the reaction, drying to obtain the nano-diamond grafted chopped carbon fibers.

8. A heat conducting member, characterized in that: The invention comprises a plastic alloy as claimed in claim 1 or 2 or a plastic alloy prepared by the preparation method of the plastic alloy as claimed in any one of claims 3 to 7.

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