Heat-conducting PC material and preparation method thereof
By carboxylation of carbon fibers and using them in polycarbonate, the problem of insufficient thermal conductivity of PC materials is solved, which significantly improves thermal conductivity and mechanical properties, and enhances antibacterial properties to form an efficient thermal conductivity network structure.
Patent Information
- Application Number
- CN202411447631.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2024-12-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Polycarbonate (PC) materials have poor thermal conductivity, which affects the heat dissipation effect and service life of electronic products, and their degree of combination with carbon fiber is limited, resulting in poor performance.
By carboxylated antibacterial silane coupling agent treatment on carbon fiber, the surface functional groups are increased, the interface binding force with polycarbonate is improved, and thermally conductive PC materials are processed and prepared in a twin-screw extruder to form an efficient thermally conductive network structure.
It significantly improves the thermal and mechanical properties of the material, while enhancing the antibacterial properties, and builds a dense thermal network structure.
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Figure BDA0005088144430000101
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of polymer processing, and in particular relates to a thermal conductive PC material and a preparation method thereof. Background Art
[0002] In recent years, with the deepening of research, lightweight materials and filled composite materials with simplified production processes have gradually become the focus of research. Polycarbonate (PC), as a high-performance engineering plastic, has attracted much attention due to its multiple advantages such as light weight, corrosion resistance, excellent mechanical properties and easy processing and production. It has been widely used in many fields such as electronic products, medical devices, automotive parts, aerospace, etc. However, the thermal conductivity of PC material itself is only 0.23W / m -1 K -1 , which is a polymer material with poor thermal conductivity, can easily affect the heat dissipation effect of electronic products and other items, shorten their service life, and increase safety hazards.
[0003] Carbon fiber itself has excellent thermal conductivity, and its high thermal conductivity makes it an ideal material for enhancing the thermal conductivity of polycarbonate. When carbon fiber is evenly dispersed and embedded in the polycarbonate matrix, it can form an effective thermal conductive network to promote rapid heat transfer. However, polycarbonate still has a high viscosity even at high temperatures, and has a low affinity with the inert carbon fiber surface. The composite material made of the two has a limited degree of bonding and still has poor performance problems such as thermal conductivity. Summary of the invention
[0004] In order to solve the problem that the PC material in the background art still has poor performance such as thermal conductivity, the present invention provides a thermal conductive PC material and a preparation method.
[0005] The purpose of the present invention can be achieved through the following technical solutions:
[0006] A thermal conductive PC material comprises the following raw materials in parts by weight: 90-100 parts of PC, 20-25 parts of modified carbon fiber, 0.5-1 part of dioctyl phthalate, 1-2 parts of antioxidant, and 1-2 parts of lubricant.
[0007] The thermally conductive PC material is made by the following steps:
[0008] PC, modified carbon fiber, dioctyl phthalate, antioxidant and lubricant are accurately weighed, and the above raw materials are mixed in a mixer to obtain a mixture; the mixture is processed in a twin-screw extruder, extruded and granulated to obtain a thermally conductive PC material.
[0009] Further, the modified carbon fiber is prepared by the following steps:
[0010] Step S1: mixing carbon fiber with acetone, and ultrasonically treating for 0.5 h to obtain a treated mixed solution; placing the treated mixed solution in a flask, and refluxing at 60° C. for 24 h to remove the sizing on the surface of the carbon fiber; taking out the desizing carbon fiber, and washing it with deionized water and anhydrous ethanol alternately for 6 times, and drying it at 80° C. to obtain the desizing carbon fiber;
[0011] Among them, the usage ratio of carbon fiber to acetone is 30g:1.5L.
[0012] Step S2: adding the desizing carbon fiber to the mixed acid solution, reacting at 70° C. for 4 h, taking it out, repeatedly shaking and washing it with deionized water and anhydrous ethanol until the solution is neutral, and drying it at 80° C. to obtain the acid-oxidized carbon fiber;
[0013] The amount ratio of desizing carbon fiber to mixed acid solution is 30 g:1.5 L; the mixed acid solution is prepared by mixing 98% by mass concentrated sulfuric acid and 65% by mass concentrated nitric acid in a volume ratio of 1:1.
[0014] Step S3: adding a carboxylated antibacterial silane coupling agent to a 90wt% ethanol aqueous solution to obtain a carboxylated antibacterial silane coupling agent solution, then adding the acid-oxidized carbon fiber to the carboxylated antibacterial silane coupling agent solution for ultrasonic treatment for 1 hour, reflux at 80°C for 4 hours, taking it out and washing it with deionized water and anhydrous ethanol alternately for 6 times, and drying it at 80°C to obtain a modified carbon fiber;
[0015] The usage ratio of the carboxylated antibacterial silane coupling agent, the 90wt% ethanol aqueous solution, and the acid-oxidized carbon fiber is 0.35g:1.75L:30-40g.
[0016] In the above reaction, since the sizing agent affects the surface treatment and grafting of the carbon fiber, acetone is used to desize the carbon fiber; the desized carbon fiber has low surface activity and lacks functional groups, so the carbon fiber is treated by acid oxidation to introduce carboxyl and hydroxyl functional groups on its surface to improve its surface activity; a large number of oxygen-containing functional groups such as carboxyl and hydroxyl groups exist on the surface of the carbon fiber after acid oxidation, which can undergo coupling reaction with the carboxylated antibacterial silane coupling agent, so that the carboxylated antibacterial silane coupling agent is grafted on the surface of the acid-oxidized carbon fiber.
[0017] Further, the carboxylated antibacterial silane coupling agent is prepared by the following steps:
[0018] Step A1: 4-bromo-1-butene, anhydrous toluene and chloroplatinic acid solution were added to a three-necked flask, triethoxysilane was weighed and placed in a constant pressure funnel, nitrogen was introduced, preheated at 60°C for 60 min, triethoxysilane was added dropwise at 95°C, and refluxed for 8 h. After the reaction was completed, the reaction product was washed with water, allowed to stand for separation, dried over anhydrous calcium chloride, filtered, and toluene was removed by rotary evaporation to obtain bromobutyltriethoxysilane;
[0019] Among them, the usage ratio of 4-bromo-1-butene, anhydrous toluene, chloroplatinic acid solution and triethoxysilane is 6.5g:18g:100μL:9g; the usage ratio of chloroplatinic acid and isopropanol in the chloroplatinic acid solution is 0.25g:25mL.
[0020] Step A2: Dimethylaminoethyl methacrylate, bromobutyltriethoxysilane and acetone are placed in a three-necked flask, nitrogen is introduced, the reaction is carried out at 55° C. for 60 hours, and the acetone is removed by reduced pressure distillation to obtain a distillate; after the remaining distillate is cooled to room temperature, ether is added, and the distillate is cooled to 0° C. for crystallization, and then filtered, washed with anhydrous ether three times, and vacuum dried at 45° C. for 24 hours to obtain an antibacterial siloxane monomer;
[0021] Among them, the mass ratio of dimethylaminoethyl methacrylate, brominated butyltriethoxysilane and acetone is 6:14.5:30.
[0022] Step A3: adding antibacterial siloxane monomer and acrylic acid into a four-necked flask, introducing nitrogen gas under stirring, heating to 65° C. after 30 minutes, dripping 0.3 wt % azobisisobutylamidine hydrochloride solution into the four-necked flask in two batches with an interval of 15 minutes, reacting at 65° C. for 8 hours after the addition is complete, and obtaining a reaction solution; cooling the reaction solution to room temperature, pouring it into acetone, and filtering to obtain a white block solid; filtering and crushing the white block solid, soaking and washing it with acetone for 3 times, and then vacuum drying it at 60° C. for 24 hours to obtain a carboxylated antibacterial silane coupling agent;
[0023] The dosage ratio of the antibacterial siloxane monomer, acrylic acid and 0.3wt% azobisisobutylamidine hydrochloride solution is 2-6g:30g:50mL.
[0024] In the above reaction, 4-bromo-1-butene and triethoxysilane are subjected to a hydrosilylation reaction to obtain bromobutyltriethoxysilane, and bromobutyltriethoxysilane is subjected to a quaternization reaction with dimethylaminoethyl methacrylate to synthesize an antibacterial siloxane monomer, and then the antibacterial siloxane monomer is polymerized with acrylic acid to obtain a carboxylated antibacterial silane coupling agent.
[0025] Furthermore, the mixing temperature of the mixer is 40-70°C, the mixing speed is 400-600rpm, and the mixing time is 5-10min; the twin-screw extruder comprises six temperature zones, wherein the temperature of each zone is: zone one temperature 220-240°C, zone two temperature 230-250°C, zone three temperature 240-260°C, zone four temperature 250-270°C, zone five temperature 260-280°C, zone six temperature 270-285°C; the head temperature of the twin-screw extruder is 270-290°C, and the screw speed is 200-400r / min.
[0026] Furthermore, the antioxidant is at least one of antioxidant 168 and antioxidant 1076.
[0027] Furthermore, the lubricant is at least one of pentaerythritol stearate and zinc stearate.
[0028] Beneficial effects of the present invention:
[0029] 1. The present invention modifies the surface of carbon fiber by using a carboxylated antibacterial silane coupling agent. The coupling agent has a carboxyl functional group and can undergo esterification reaction with active groups such as terminal hydroxyl groups on the surface of polycarbonate materials or form a stable hydrogen bond structure, which significantly enhances the interfacial bonding force between carbon fiber and PC. In addition, the roughness of the carbon fiber surface grafted with the carboxylated antibacterial silane coupling agent is significantly improved. This change not only optimizes the microstructure of the fiber surface, but also significantly enhances the mechanical interlocking effect with the polycarbonate matrix, thereby further strengthening the interfacial bonding strength between the two. This high-strength interface bonding mechanism constructs a dense and efficient thermal conductive network structure in the PC material, significantly improves the thermal conductivity of the material, and simultaneously enhances the overall mechanical properties.
[0030] 2. The carboxylated antibacterial silane coupling agent prepared by the present invention contains a quaternary ammonium salt group, so that the coupling agent can enhance the dispersibility of carbon fibers in PC while also improving the antibacterial properties of the PC material. DETAILED DESCRIPTION
[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0032] The polycarbonate in the present invention is provided by Mitsubishi Chemical Corporation, and its model is IupilonTM H-4000.
[0033] Carbon fiber was provided by Toray Carbon Fiber (Guangdong) Co., Ltd., with a length of 6 mm, a diameter of 7 μm, and a density of 1.76 g cm -3 , tensile strength 3.53MPa.
[0034] Example 1
[0035] The carboxylated antibacterial silane coupling agent of the present embodiment is prepared by the following steps:
[0036] Step A1: 6.5 g of 4-bromo-1-butene, 18 g of anhydrous toluene, and 100 μL of chloroplatinic acid solution (the ratio of chloroplatinic acid to isopropanol in the chloroplatinic acid solution is 0.25 g:25 mL) are added to a three-necked flask, 9 g of triethoxysilane is weighed and placed in a constant pressure funnel, nitrogen is introduced, preheated at 60° C. for 60 min, triethoxysilane is added dropwise at 95° C., and refluxed for 8 h. After the reaction is completed, the reaction product is washed with water, allowed to stand for separation, dried over anhydrous calcium chloride, filtered, and toluene is removed by rotary evaporation to obtain bromobutyltriethoxysilane;
[0037] Step A2: 6 g of dimethylaminoethyl methacrylate, 14.5 g of bromobutyltriethoxysilane, and 30 g of acetone were placed in a three-necked flask, nitrogen was introduced, and the mixture was reacted at 55° C. for 60 h, and the acetone was removed by reduced pressure distillation to obtain a distillate; after the remaining distillate was cooled to room temperature, ether was added, and the mixture was cooled to 0° C. for crystallization, and then filtered, washed with anhydrous ether for three times, and vacuum dried at 45° C. for 24 h to obtain an antibacterial siloxane monomer;
[0038] Step A3: 2 g of antibacterial siloxane monomer and 30 g of acrylic acid are added to a four-necked flask, nitrogen is introduced under stirring, and the temperature is raised to 65° C. after 30 min, and 50 mL of 0.3 wt% azobisisobutylamidine hydrochloride solution is dripped into the four-necked flask in two batches at an interval of 15 min. After the addition is completed, the reaction is carried out at 65° C. for 8 h to obtain a reaction solution; the reaction solution is cooled to room temperature and poured into acetone, and a white block solid is obtained by suction filtration; the white block solid is suction filtered and crushed, and it is soaked and washed with acetone for 3 times, and then vacuum dried at 60° C. for 24 h to obtain a carboxylated antibacterial silane coupling agent.
[0039] Example 2
[0040] The carboxylated antibacterial silane coupling agent of the present embodiment is prepared by the following steps:
[0041] The rest is the same as Example 1, except that the amount of antibacterial siloxane monomer added in step A3 is 4 g.
[0042] Example 3
[0043] The carboxylated antibacterial silane coupling agent of the present embodiment is prepared by the following steps:
[0044] The rest is the same as Example 1, except that the amount of antibacterial siloxane monomer added in step A3 is 6 g.
[0045] Comparative Example 1
[0046] This comparative example provides a carboxylated antibacterial silane coupling agent. Compared with Example 1, the acrylic acid in Example 1 is replaced by acrylamide, and the remaining raw materials and preparation process are the same as those in Example 1.
[0047] Comparative Example 2
[0048] This comparative example is triethoxysilane.
[0049] Example 4
[0050] The modified carbon fiber of this embodiment is prepared by the following steps:
[0051] Step S1: 30 g of carbon fiber was mixed with 1.5 L of acetone, and ultrasonically treated for 0.5 h to obtain a treated mixed solution; the treated mixed solution was placed in a flask, and refluxed at 60° C. for 24 h to remove the sizing on the surface of the carbon fiber; the desizing carbon fiber was taken out, and was washed with deionized water and anhydrous ethanol alternately for 6 times, and dried at 80° C. to obtain the desizing carbon fiber;
[0052] Step S2: adding 30g of deslurried carbon fiber into 1.5L of a mixed acid solution prepared by mixing 98% concentrated sulfuric acid and 65% concentrated nitric acid in a volume ratio of 1:1, reacting at 70°C for 4h, taking out and repeatedly shaking and washing with deionized water and anhydrous ethanol until the solution is neutral, and drying at 80°C to obtain acid-oxidized carbon fiber;
[0053] Step S3: Add 0.35 g of carboxylated antibacterial silane coupling agent to 1.75 L of 90 wt% ethanol aqueous solution, add 30 g of acid-oxidized carbon fiber, ultrasonically treat for 1 h, reflux at 80 ° C for 4 h, take out and wash with deionized water and anhydrous ethanol alternately for 6 times, and dry at 80 ° C to obtain modified carbon fiber.
[0054] The preparation process of the carboxylated antibacterial silane coupling agent is the same as that of Example 1.
[0055] Example 5
[0056] The modified carbon fiber of this embodiment is prepared by the following steps:
[0057] The rest is the same as Example 4, except that the amount of carbon fiber added after acid oxidation in step S3 is 35 g.
[0058] Example 6
[0059] The modified carbon fiber of this embodiment is prepared by the following steps:
[0060] The rest is the same as Example 4, except that the amount of acid-oxidized carbon fiber added in step S3 is 40 g.
[0061] Comparative Example 3
[0062] This comparative example provides a modified carbon fiber. Compared with Example 4, the carboxylated antibacterial silane coupling agent in Example 4 is replaced by the substance prepared in Comparative Example 1, and the remaining raw materials and preparation process are the same as Example 4.
[0063] Comparative Example 4
[0064] This comparative example provides a modified carbon fiber. Compared with Example 4, the carboxylated antibacterial silane coupling agent in Example 4 is replaced by the substance in Comparative Example 2, and the remaining raw materials and preparation process are the same as Example 4.
[0065] Example 7
[0066] The present embodiment provides a thermally conductive PC material, comprising the following raw materials in parts by weight: 95 parts of PC, 20 parts of modified carbon fiber, 1 part of dioctyl phthalate, 2 parts of antioxidant 168, and 2 parts of pentaerythritol stearate.
[0067] The thermally conductive PC material is made by the following steps:
[0068] Accurately weigh PC, modified carbon fiber, dioctyl phthalate, antioxidant 168 and pentaerythritol stearate, mix the above raw materials in a mixer to obtain a mixture; process the mixture in a twin-screw extruder, extrude and granulate, and obtain a thermally conductive PC material. The mixing temperature of the mixer is 40°C, the mixing speed is 400rpm, and the mixing time is 5min; the twin-screw extruder contains six temperature zones, wherein the temperature of each zone is: zone 1 temperature 220°C, zone 2 temperature 230°C, zone 3 temperature 240°C, zone 4 temperature 250°C, zone 5 temperature 260°C, zone 6 temperature 270°C; the head temperature of the twin-screw extruder is 270°C, and the screw speed is 200r / min.
[0069] The preparation process of the modified carbon fiber is the same as that of Example 4.
[0070] Example 8
[0071] The present embodiment provides a thermally conductive PC material, comprising the following raw materials in parts by weight: 90 parts of PC, 22 parts of modified carbon fiber, 0.75 parts of dioctyl phthalate, 1 part of antioxidant 168, 1 part of antioxidant 1076, 1 part of pentaerythritol stearate, and 1 part of zinc stearate.
[0072] The thermally conductive PC material is made by the following steps:
[0073] Accurately weigh PC, modified carbon fiber, dioctyl phthalate, antioxidant 168, antioxidant 1076, pentaerythritol stearate and zinc stearate, mix the above raw materials in a mixer to obtain a mixture; process the mixture in a twin-screw extruder, extrude and granulate to obtain a thermally conductive PC material. The mixing temperature of the mixer is 60°C, the mixing speed is 500rpm, and the mixing time is 8min; the twin-screw extruder contains six temperature zones, wherein the temperature of each zone is: zone 1 temperature 230°C, zone 2 temperature 240°C, zone 3 temperature 250°C, zone 4 temperature 260°C, zone 5 temperature 270°C, zone 6 temperature 275°C; the head temperature of the twin-screw extruder is 280°C, and the screw speed is 300r / min.
[0074] The preparation process of the modified carbon fiber is the same as that of Example 5.
[0075] Example 9
[0076] The present embodiment provides a thermally conductive PC material, comprising the following raw materials in parts by weight: 100 parts of PC, 25 parts of modified carbon fiber, 0.5 parts of dioctyl phthalate, 1.5 parts of antioxidant 1076, and 1.5 parts of zinc stearate.
[0077] The thermally conductive PC material is made by the following steps:
[0078] Accurately weigh PC, modified carbon fiber, dioctyl phthalate, antioxidant 1076, and zinc stearate, and mix the above raw materials in a mixer to obtain a mixture; process the mixture in a twin-screw extruder, extrude and granulate, and obtain a thermally conductive PC material. The mixing temperature of the mixer is 70°C, the mixing speed is 600rpm, and the mixing time is 10min; the twin-screw extruder contains six temperature zones, wherein the temperature of each zone is: the temperature of zone 1 is 240°C, the temperature of zone 2 is 250°C, the temperature of zone 3 is 260°C, the temperature of zone 4 is 270°C, the temperature of zone 5 is 280°C, and the temperature of zone 6 is 285°C; the head temperature of the twin-screw extruder is 290°C, and the screw speed is 400r / min.
[0079] The preparation process of the modified carbon fiber is the same as that of Example 6.
[0080] Comparative Example 5
[0081] The modified carbon fiber in Example 7 was replaced by the material prepared in Comparative Example 3, and the rest of the process was the same as in Example 7.
[0082] Comparative Example 6
[0083] The modified carbon fiber in Example 7 was replaced by the material prepared in Comparative Example 4, and the rest of the process was the same as in Example 7.
[0084] The PC materials prepared in Examples 7 to 9 and Comparative Examples 5 and 6 were tested for performance, and the items are as follows:
[0085] 1. Antibacterial performance: Escherichia coli was used as the test bacteria and the antibacterial rate was determined in accordance with GB / T 31402.
[0086] 2. Thermal conductivity: Tested in accordance with GB / T 3139-2005.
[0087] 3. Tensile strength: Tested in accordance with GB / T 1040.2-2006.
[0088] 4. Bending strength: Tested in accordance with GB / T 1843-2006.
[0089] The specific test results are shown in Table 1:
[0090] Table 1
[0091]
[0092]
[0093] Table 1 shows the performance test results of the PC materials prepared in Examples 7 to 9 and Comparative Examples 5 and 6. From the above performance test results, it can be seen that the PC materials prepared in Examples 7 to 9 are superior to Comparative Examples 5 and 6 in terms of antibacterial rate against Escherichia coli, thermal conductivity, tensile strength and bending strength, indicating that the carboxylated antibacterial silane coupling agent prepared in the present invention has the effect of improving the antibacterial rate, thermal conductivity, tensile strength and bending strength of PC materials.
[0094] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0095] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A thermally conductive PC material, characterized in that: The invention comprises the following raw materials in parts by weight: 90-100 parts of PC, 20-25 parts of modified carbon fiber, 0.5-1 parts of dioctyl phthalate, 1-2 parts of antioxidant and 1-2 parts of lubricant.
2. A thermally conductive PC material according to claim 1, characterized in that: Modified carbon fiber is made by the following steps: The carboxylated antibacterial silane coupling agent was added to a 90wt% ethanol aqueous solution, and then the acid-oxidized carbon fiber was added, ultrasonically treated for 1 hour, refluxed at 80°C for 4 hours, washed, and dried to obtain the modified carbon fiber.
3. A thermally conductive PC material according to claim 2, characterized in that: The usage ratio of the carboxylated antibacterial silane coupling agent, the 90wt% ethanol aqueous solution and the acid-oxidized carbon fiber is 0.35g:1.75L:30-40g.
4. A thermally conductive PC material according to claim 2, characterized in that: The acid-oxidized carbon fiber is a desized carbon fiber treated with a mixed acid solution consisting of concentrated sulfuric acid and concentrated nitric acid.
5. A thermally conductive PC material according to claim 2, characterized in that: The carboxylated antibacterial silane coupling agent is prepared by the following steps: Step A1: 4-bromo-1-butene, anhydrous toluene and chloroplatinic acid solution were mixed, nitrogen was introduced, and the mixture was preheated at 60° C. for 60 min, triethoxysilane was added dropwise at 95° C., and the mixture was refluxed for 8 h. After the reaction was completed, the reaction product was washed with water, separated, dried, filtered, and rotary evaporated to obtain bromobutyltriethoxysilane; Step A2: dimethylaminoethyl methacrylate, bromobutyltriethoxysilane and acetone are mixed, nitrogen is introduced, the mixture is reacted at 55° C. for 60 hours, and distilled under reduced pressure to obtain a distillate; the remaining distillate is cooled to room temperature, ether is added, and the mixture is cooled to 0° C., filtered, washed, and dried at 45° C. for 24 hours to obtain an antibacterial siloxane monomer; Step A3: Mix the antibacterial siloxane monomer and acrylic acid, introduce nitrogen under stirring, heat to 65° C. after 30 minutes, drop 0.3wt% azobisisobutylamidine hydrochloride solution, react at 65° C. for 8 hours to obtain a reaction solution; cool the reaction solution to room temperature and pour it into acetone, filter, crush, wash, and dry at 60° C. for 24 hours to obtain a carboxylated antibacterial silane coupling agent.
6. A thermally conductive PC material according to claim 5, characterized in that: In step A1, the usage ratio of 4-bromo-1-butene, anhydrous toluene, chloroplatinic acid solution, and triethoxysilane is 6.5 g:18 g:100 μL:9 g, and the usage ratio of chloroplatinic acid and isopropanol in the chloroplatinic acid solution is 0.25 g:25 mL.
7. The thermally conductive PC material according to claim 5, characterized in that: In step A2, the mass ratio of dimethylaminoethyl methacrylate, bromobutyltriethoxysilane and acetone is 6:14.5:
30.
8. The thermally conductive PC material according to claim 5, characterized in that: In step A3, the usage ratio of the antibacterial siloxane monomer, acrylic acid, and 0.3 wt % azobisisobutylamidine hydrochloride solution is 2-6 g:30 g:50 mL.
9. A method for preparing a thermally conductive PC material according to any one of claims 1 to 8, characterized in that: The following steps are involved: PC, modified carbon fiber, dioctyl phthalate, antioxidant and lubricant are accurately weighed, and the above raw materials are mixed in a mixer to obtain a mixture; the mixture is processed in a twin-screw extruder, extruded and granulated to obtain a thermally conductive PC material.
10. The method for preparing a thermally conductive PC material according to claim 9, characterized in that: The mixing temperature of the mixer is 40-70°C, the mixing speed is 400-600rpm, and the mixing time is 5-10min; the twin-screw extruder comprises six temperature zones, wherein the temperature of each zone is: zone one temperature 220-240°C, zone two temperature 230-250°C, zone three temperature 240-260°C, zone four temperature 250-270°C, zone five temperature 260-280°C, zone six temperature 270-285°C; the head temperature of the twin-screw extruder is 270-290°C, and the screw speed is 200-400r / min.