CN114989608B - Heat-conducting polysulfone composite material and preparation method thereof - Google Patents

Heat-conducting polysulfone composite material and preparation method thereof Download PDF

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CN114989608B
CN114989608B CN202210775418.4A CN202210775418A CN114989608B CN 114989608 B CN114989608 B CN 114989608B CN 202210775418 A CN202210775418 A CN 202210775418A CN 114989608 B CN114989608 B CN 114989608B
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hot press
heat
temperature
double
polysulfone
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CN114989608A (en
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于冉
张东宝
徐良
乐泽伟
陈荣强
张建
邵彩萍
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Ningxia Qingyan Polymer New Material Co ltd
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    • C08J2381/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen, or carbon only; Polysulfones; Derivatives of such polymers
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Abstract

The invention particularly relates to a heat-conducting polysulfone composite material and a preparation method thereof, and belongs to the technical field of high polymer materials, wherein the composite material comprises polysulfone microspheres, polymers and modified heat-conducting fillers, and the modified heat-conducting fillers are polydopamine coated boron nitride nano-sheets; the compatibility between the modified heat conducting filler and the polymer is increased, and the heat conducting filler is arranged along the polysulfone microspheres by utilizing the high fluidity of the polymer and the extrusion of the polysulfone microspheres, so that a heat conducting network is formed, and the heat conducting property of the polysulfone composite material is improved.

Description

Heat-conducting polysulfone composite material and preparation method thereof
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a heat-conducting polysulfone composite material and a preparation method thereof.
Background
With the rapid development of modern electronic technology, electronic devices are further miniaturized, highly integrated and high-performance, which puts higher requirements on the performance of heat-conducting and insulating materials, and currently used heat-dissipating materials tend to be worry about handling heat dissipation problems due to lower heat conductivity coefficients, so that the application requirements of modern electronic equipment cannot be met. If the accumulated heat cannot be timely diffused, the service life and the service performance of the electronic device can be seriously affected by the excessive temperature inside the equipment. The traditional heat-conducting insulating polymer has the problems of agglomeration of filler, large interfacial thermal resistance and the like, is difficult to combine high heat conductivity and high mechanical property, and has a huge bottleneck in the development of the heat dissipation field.
Polysulfone is an amber amorphous transparent polymer material, has high hardness and impact strength, is nontoxic, has good heat and cold resistance and aging resistance, can be used for a long time at-100-175 ℃, and is commonly used for manufacturing devices such as integrated circuit boards, coil tube frames, contactors and the like in the electronic and electric industry. However, polysulfone materials have low thermal conductivity, local heat aggregation can occur due to environmental temperature change, so that the problems of system instability such as thermal fatigue failure and stress cracking are caused, and the use performance of the polysulfone materials is influenced. Therefore, the heat-conducting property of the polysulfone material is required to be modified, so that the polysulfone material has wider application prospect in the technical field of electronic integration.
The heat conducting polymer material is divided into an intrinsic heat conducting polymer and a filling heat conducting polymer. The intrinsic heat conduction macromolecule forms regular arrangement to improve the self heat conductivity by changing the chain segment structure of the polymer in the preparation process; the intrinsic heat conducting polymer material changes the molecular chain and chain segment structure by preparing a conjugated structure or high-power stretching or reinforcing the microscopic ordered structure of the matrix, so that the self heat conductivity of the intrinsic heat conducting polymer material is improved, the compatibility and the interface heat resistance are not existed, but the preparation method is harsh and cannot be used in large scale in actual production. The filled heat-conducting polymer encapsulates the heat-conducting filler in the polymer matrix through blending and molding, and forms a heat-conducting passage through the heat-conducting filler, so that the heat conductivity of the composite material is improved. The filler type polymer material is usually introduced into the polymer matrix by using a preparation method of solution blending, melt blending, mechanical blending and suspension/emulsion, however, the introduction of the filler may form defects such as interface incompatibility, and the like, so that the heat conducting property of the composite material is poor. The general heat conduction performance of the filled polymer composite material is improved mainly in two aspects: firstly, phonon scattering is reduced by modifying the filler, interface thermal resistance is reduced, and dispersibility of the filler in a polymer matrix is improved; secondly, a good heat conduction network is constructed by regulating and controlling the dispersion state of the heat conduction filler. The preparation method of the filled high polymer material is relatively simple, different processing technologies can be adopted to prepare the composite material, if the heat conducting filler is directly filled, the randomly dispersed heat conducting filler is extremely easy to generate phonon scattering, so that the problems of extremely large interface thermal resistance of the filler/matrix and the filler/filler and the like are caused, and a heat conducting network cannot be formed, so that the heat conducting performance of the composite material is greatly hindered.
Disclosure of Invention
The purpose of the application is to provide a heat conduction polysulfone composite and a preparation method thereof, so as to solve the problem that the heat conduction performance of the conventional polysulfone material is poor.
The embodiment of the invention provides a heat-conducting polysulfone composite material, which comprises polysulfone microspheres, a polymer and a modified heat-conducting filler, wherein the modified heat-conducting filler is a polydopamine-coated boron nitride nano-sheet.
Optionally, the polymer is polypropylene and/or polyethylene.
Based on the same inventive concept, the embodiment of the invention also provides a preparation method of the heat conduction polysulfone composite material, which comprises the following steps:
mixing the boron nitride nanosheets with a modifier to obtain a solution to be reacted;
the pH value of the solution to be reacted is adjusted to a set value by adopting tris (hydroxymethyl) aminomethane, and the solution is separated and dried after the reaction to obtain a modified heat-conducting filler;
mixing and granulating the polymer, the nano tube and the modified heat conducting filler to obtain a modified polymer;
and mixing the polysulfone microspheres with the modified polymer, and performing hot press molding to obtain the heat-conducting polysulfone composite.
Optionally, the modifier comprises at least one of dopa, dopamine and dopamine hydrochloride.
Optionally, the set value is 8-9.
Optionally, the separation is carried out by adopting a polyethersulfone microporous filter membrane, the drying temperature is 50-70 ℃, and the drying time is 10-14h.
Optionally, the nanotubes include boron nitride nanotubes and/or carbon nanotubes.
Optionally, the mixing granulation adopts a double-screw extruder, wherein the temperature of a first region of the double-screw extruder is 200-240 ℃, the temperature of a second region of the double-screw extruder is 215-250 ℃, the temperature of a third region of the double-screw extruder is 220-260 ℃, the temperature of a fourth region of the double-screw extruder is 220-260 ℃, the temperature of a fifth region of the double-screw extruder is 230-270 ℃, the temperature of a sixth region of the double-screw extruder is 220-260 ℃, and the screw rotating speed of the double-screw extruder is 80-120rpm.
Optionally, the polysulfone microsphere has a particle size of 100-300 μm.
Optionally, the hot press forming includes a first hot press and a second hot press, where the temperature of the first hot press is 170-180 ℃, the pressure of the first hot press is 8-12MPa, the time of the first hot press is 8-12min, the temperature of the second hot press is 200-300 ℃, the pressure of the second hot press is 10-14MPa, and the time of the second hot press is 10-20min.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
according to the heat-conducting polysulfone composite material provided by the embodiment of the invention, the compatibility between the modified heat-conducting filler and the polymer is increased, and the heat-conducting filler is arranged along the polysulfone microspheres by utilizing the high fluidity of the polymer and the extrusion of the polysulfone microspheres, so that a heat-conducting network is formed, and the heat-conducting property of the polysulfone composite material is improved.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method provided by an embodiment of the present invention.
Detailed Description
The advantages and various effects of the present invention will be more clearly apparent from the following detailed description and examples. It will be understood by those skilled in the art that these specific embodiments and examples are intended to illustrate the invention, not to limit the invention.
Throughout the specification, unless specifically indicated otherwise, the terms used herein should be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification will control.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or may be prepared by existing methods.
The technical scheme of the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
according to an exemplary embodiment of the present invention, there is provided a thermally conductive polysulfone composite material, the components of which comprise polysulfone microspheres, a polymer and a modified thermally conductive filler, wherein the modified thermally conductive filler is a polydopamine-coated boron nitride nanosheet.
By adopting the design, the compatibility between the modified heat conducting filler and the polymer is increased, and the heat conducting filler is arranged along the polysulfone microspheres by utilizing the high fluidity of the polymer and the extrusion of the polysulfone microspheres, so that a heat conducting network is formed, and the heat conducting property of the polysulfone composite material is improved.
In some embodiments, the polymer is polypropylene and/or polyethylene.
According to another exemplary embodiment of the present invention, there is provided a method for preparing a heat conductive polysulfone composite as described above, the method comprising:
s1, mixing a boron nitride nano sheet and a modifier to obtain a solution to be reacted;
in some embodiments, the modifying agent comprises at least one of dopa, dopamine, and dopamine hydrochloride.
Specifically, in this example, 0.5-2g of Boron Nitride Nanosheets (BNNS) and 150-300mL of distilled water were weighed in a 500mL beaker, and after ultrasonic dispersion for 30min, 0.5-1g of modifier was added to obtain a solution to be reacted.
S2, adopting tris (hydroxymethyl) aminomethane to adjust the pH value of the solution to be reacted to a set value, wherein the set value is 8-9, and separating and drying after the reaction to obtain the modified heat-conducting filler;
in some embodiments, the separation is performed using a polyethersulfone microfiltration membrane, the drying temperature is 50-70 ℃, and the drying time is 10-14 hours.
Specifically, in this example, tris (hydroxymethyl) aminomethane was added dropwise to adjust the pH of the solution to 8 to 9. Finally, the mixed solution is reacted for 1 to 3 hours at a stirring speed of 300 to 450 rpm. Filtering with a polyethersulfone microporous filter membrane with the pore diameter of 0.45 μm after the reaction is finished, repeatedly washing with distilled water for a plurality of times, and finally placing the polydopamine coated boron nitride nano-sheet in a 60 ℃ oven for drying for 12 hours.
S3, mixing and granulating the polymer, the nano tube and the modified heat conducting filler to obtain a modified polymer;
in some embodiments, the nanotubes comprise boron nitride nanotubes and/or carbon nanotubes.
In some embodiments, the mixing granulation employs a twin screw extruder having a one zone temperature of 200-240 ℃, a two zone temperature of 215-250 ℃, a three zone temperature of 220-260 ℃, a four zone temperature of 220-260 ℃, a five zone temperature of 230-270 ℃, a six zone temperature of 220-260 ℃, and a screw speed of 80-120rpm.
Specifically, in this example, 500g of polymer, 25-100g of polydopamine coated boron nitride nanosheets and 5-10g of nanotubes were weighed and mixed uniformly, then the mixture was added into a twin screw extruder, the temperatures of each section were set to be 220 ℃ in one zone, 235 ℃ in two zones, 240 ℃ in three zones, 240 ℃ in four zones, 250 ℃ in five zones and 240 ℃ in six zones, the screw rotation speed was set to be 100rpm, and after pelleting was completed by a pelletizer, the particles of the obtained polymer composite material were mixed uniformly to obtain a modified polymer.
S4, mixing the polysulfone microspheres with the modified polymer, and performing hot press molding to obtain the heat-conducting polysulfone composite.
In some embodiments, the polysulfone microspheres have a particle size of 100-300 μm.
In some embodiments, the hot press forming comprises a first hot press having a temperature of 170-180 ℃, a pressure of 8-12MPa, a time of 8-12min, a temperature of 200-300 ℃, a pressure of 10-14MPa, and a time of 10-20min.
Specifically, in this example, 50-70 parts of polysulfone microspheres and 30-50 parts of polymer composite material granules are uniformly mixed, then the mixed granules are hot-pressed in a flat vulcanizing machine to form, firstly, the mixture is pre-pressed for 10min at 170-180 ℃ and 10MPa, then the pre-pressed composite material is pressed for 10-20min at 280-300 ℃ and 10-14MPa, and finally the size of 10X 12X 1mm is obtained 3 Is a sheet of polysulfone composite.
The heat conductive polysulfone composite of the present application and the method of preparing the same will be described in detail below with reference to examples, comparative examples and experimental data.
Example 1
A preparation method of a heat-conducting polysulfone composite material comprises the following steps:
(1) Preparation of modified filler
In a 500mL beaker, 0.5g of Boron Nitride Nanosheets (BNNS) and 200mL of distilled water were weighed, after ultrasonic dispersion for 30min, 0.5g of dopa was added, and then tris (hydroxymethyl) aminomethane was added dropwise to adjust the pH of the solution to 8. Finally, the mixed solution was reacted at a stirring speed of 300rpm for 1 hour. Filtering with a polyethersulfone microporous filter membrane with the pore diameter of 0.45 μm after the reaction is finished, repeatedly washing with distilled water for a plurality of times, and finally placing the polydopamine coated boron nitride nano-sheet in a 60 ℃ oven for drying for 12 hours.
(2) Preparation of thermally conductive filler modified polymers
Weighing 500g of polypropylene, 25g of polydopamine coated boron nitride nano-sheets and 5g of boron nitride nano-tubes, uniformly mixing, adding the mixture into a double-screw extruder, setting the temperature of each section to be 220 ℃ in the first region, 235 ℃ in the second region, 240 ℃ in the third region, 240 ℃ in the fourth region, 250 ℃ in the fifth region and 240 ℃ in the sixth region respectively, setting the screw rotating speed to be 100rpm, granulating by a granulator, and finally uniformly mixing the obtained polypropylene composite material particles.
(3) Preparation of polysulfone composite
Uniformly mixing 70 parts of polysulfone microspheres and 30 parts of PP composite material granules, hot-pressing the mixed granules in a flat vulcanizing machine to form, pre-pressing at 170 ℃ and 10MPa for 10min, and then pressing the pre-pressed composite material at 280 ℃ and 14MPa for 20min to obtain the PP composite material with the size of 10 multiplied by 12 multiplied by 1mm 3 Is a sheet of polysulfone composite.
Example 2
A preparation method of a heat-conducting polysulfone composite material comprises the following steps:
(1) Preparation of modified filler
In a 500mL beaker, 0.5g of Boron Nitride Nanosheets (BNNS) and 150mL of distilled water were weighed, after ultrasonic dispersion for 30min, 0.5g of dopamine hydrochloride was added, and then tris (hydroxymethyl) aminomethane was added dropwise to adjust the pH of the solution to 8. Finally, the mixed solution was reacted at a stirring speed of 450rpm for 2 hours. Filtering with a polyethersulfone microporous filter membrane with the pore diameter of 0.45 μm after the reaction is finished, repeatedly washing with distilled water for a plurality of times, and finally placing the polydopamine coated boron nitride nano-sheet in a 60 ℃ oven for drying for 12 hours.
(2) Preparation of thermally conductive filler modified polymers
Weighing 500g of polypropylene, 25g of polydopamine coated boron nitride nano-sheet and 10g of carbon nano-tube, uniformly mixing, adding the mixture into a double-screw extruder, setting the temperature of each section to be 220 ℃ in the first region, 235 ℃ in the second region, 240 ℃ in the third region, 240 ℃ in the fourth region, 250 ℃ in the fifth region and 240 ℃ in the sixth region respectively, setting the screw rotating speed to be 100rpm, granulating by a granulator, and finally uniformly mixing the particles of the obtained polypropylene composite material.
(3) Preparation of polysulfone composite
Uniformly mixing 65 parts of polysulfone microspheres and 35 parts of PP composite material granules, hot-pressing the mixed granules in a flat vulcanizing machine to form, pre-pressing at 170 ℃ and 10MPa for 10min, and then pressing the pre-pressed composite material at 280 ℃ and 14MPa for 15min to obtain the PP composite material with the size of 10 multiplied by 12 multiplied by 1mm 3 Is a sheet of polysulfone composite.
Example 3
A preparation method of a heat-conducting polysulfone composite material comprises the following steps:
(1) Preparation of modified filler
1g of Boron Nitride Nanosheets (BNNS) and 300mL of distilled water were weighed in a 500mL beaker, dispersed ultrasonically for 30min, 1g of dopamine was added, and then tris (hydroxymethyl) aminomethane was added dropwise to adjust the pH of the solution to 9. Finally, the mixed solution was reacted at a stirring speed of 300rpm for 2 hours. Filtering with a polyethersulfone microporous filter membrane with the pore diameter of 0.45 μm after the reaction is finished, repeatedly washing with distilled water for a plurality of times, and finally placing the polydopamine coated boron nitride nano-sheet in a 60 ℃ oven for drying for 12 hours.
(2) Preparation of thermally conductive filler modified polymers
Weighing 500g of polyethylene, 50g of polydopamine coated boron nitride nanosheets and 10g of boron nitride nanotubes, uniformly mixing, adding the mixture into a double-screw extruder, setting the temperature of each section to be 220 ℃ in one region, 235 ℃ in two regions, 240 ℃ in three regions, 240 ℃ in four regions, 250 ℃ in five regions and 240 ℃ in six regions respectively, setting the screw rotating speed to be 100rpm, granulating by a granulator, and finally uniformly mixing the obtained polypropylene composite particles.
(3) Preparation of polysulfone composite
Uniformly mixing 65 parts of polysulfone microspheres and 35 parts of PP composite material granules, hot-pressing the mixed granules in a flat vulcanizing machine to form, pre-pressing at 180 ℃ and 10MPa for 10min, and then pressing the pre-pressed composite material at 300 ℃ and 14MPa for 10minFinally, the size of the product is 10 multiplied by 12 multiplied by 1mm 3 Is a sheet of polysulfone composite.
Example 4
A preparation method of a heat-conducting polysulfone composite material comprises the following steps:
(1) Preparation of modified filler
1g of boron nitride nano-sheet (BNNS) and 300mL of distilled water were weighed in a 500mL beaker, dispersed by ultrasound for 30min, 1g of dopamine hydrochloride was added, and then tris (hydroxymethyl) aminomethane was added dropwise to adjust the pH of the solution to 9. Finally, the mixed solution was reacted at a stirring speed of 450rpm for 3 hours. Filtering with a polyethersulfone microporous filter membrane with the pore diameter of 0.45 μm after the reaction is finished, repeatedly washing with distilled water for a plurality of times, and finally placing the polydopamine coated boron nitride nano-sheet in a 60 ℃ oven for drying for 12 hours.
(2) Preparation of thermally conductive filler modified polymers
Weighing 500g of polypropylene, 100g of polydopamine coated boron nitride nano-sheets and 10g of boron nitride nano-tubes, uniformly mixing, adding the mixture into a double-screw extruder, setting the temperature of each section to be 220 ℃ in the first region, 235 ℃ in the second region, 240 ℃ in the third region, 240 ℃ in the fourth region, 250 ℃ in the fifth region and 240 ℃ in the sixth region respectively, setting the screw rotating speed to be 100rpm, granulating by a granulator, and finally uniformly mixing the obtained polypropylene composite material particles.
(3) Preparation of polysulfone composite
Uniformly mixing 50 parts of polysulfone microspheres and 50 parts of PP composite material granules, hot-pressing the mixed granules in a flat vulcanizing machine to form, pre-pressing at 180 ℃ and 10MPa for 10min, and then pressing the pre-pressed composite material at 300 ℃ and 10MPa for 15min to obtain the PP composite material with the size of 10 multiplied by 12 multiplied by 1mm 3 Is a sheet of polysulfone composite.
Example 5
A preparation method of a heat-conducting polysulfone composite material comprises the following steps:
(1) Preparation of modified filler
2g of Boron Nitride Nanosheets (BNNS) and 300mL of distilled water were weighed in a 500mL beaker, dispersed ultrasonically for 30min, 1g of dopamine hydrochloride was added, and then tris (hydroxymethyl) aminomethane was added dropwise to adjust the pH of the solution to 9. Finally, the mixed solution was reacted for 3 hours at a stirring speed of 400 rpm. Filtering with a polyethersulfone microporous filter membrane with the pore diameter of 0.45 μm after the reaction is finished, repeatedly washing with distilled water for a plurality of times, and finally placing the polydopamine coated boron nitride nano-sheet in a 60 ℃ oven for drying for 12 hours.
(2) Preparation of thermally conductive filler modified polymers
Weighing 500g of polyethylene, 50g of polydopamine coated boron nitride nano-sheet and 5g of carbon nano-tube, uniformly mixing, adding the mixture into a double-screw extruder, setting the temperature of each section to be 220 ℃ in the first region, 235 ℃ in the second region, 240 ℃ in the third region, 240 ℃ in the fourth region, 250 ℃ in the fifth region and 240 ℃ in the sixth region respectively, setting the screw rotating speed to be 100rpm, granulating by a granulator, and finally uniformly mixing the obtained polypropylene composite material particles.
(3) Preparation of polysulfone composite
Uniformly mixing 60 parts of polysulfone microspheres and 40 parts of PP composite material granules, hot-pressing the mixed granules in a flat vulcanizing machine to form, pre-pressing at 180 ℃ and 10MPa for 10min, and then pressing the pre-pressed composite material at 290 ℃ and 12MPa for 20min to obtain the PP composite material with the size of 10 multiplied by 12 multiplied by 1mm 3 Is a sheet of polysulfone composite.
Comparative example 1
The comparative example used pure PSF (polysulfone).
Related experiments:
the materials provided in examples 1-5 and comparative example 1 were subjected to thermal conductivity testing and the results are shown in the following table.
According to the preparation method, the heat-conducting filler is modified by the polydopamine, the polymer and the heat-conducting filler are extruded and granulated in a melt blending mode, and finally the heat-conducting polysulfone composite material is prepared by the heat-conducting filler modified polymer and the polysulfone microspheres in a twice hot-press molding mode, so that the heat conductivity of the material can be effectively improved, the heat conductivity is improved from 0.26 to more than 0.65, and the heat conductivity is at least improved by 2.5 times.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
the method provided by the embodiment of the invention firstly carries out modification through the heat conducting filler to improve the compatibility of the heat conducting filler and the polymer, thereby improving the problem that the nano filler is easy to agglomerate and uneven in dispersion in the matrix material; and then, the dispersibility of the heat conducting filler in the polymer is further improved by a melt blending mode, the heat conducting network of the composite material is increased by adding the nano tube so as to improve the heat conducting property of the composite material, and finally, the heat conducting polysulfone composite material is prepared by the heat conducting filler modified polymer and the polysulfone microsphere in a secondary hot press molding mode, wherein the first hot press molding is used for dispersing the heat conducting filler modified polymer in the polysulfone microsphere so as to form the heat conducting network, and the second hot press molding is used for preparing the heat conducting polysulfone composite material, so that the prepared polysulfone composite material has good heat conducting property.
Finally, it is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (4)

1. The heat-conducting polysulfone composite material is characterized by comprising polysulfone microspheres, a polymer and a modified heat-conducting filler, wherein the modified heat-conducting filler is a polydopamine-coated boron nitride nano-sheet;
the preparation method of the heat-conducting polysulfone composite material comprises the following steps:
mixing 0.5-2g of boron nitride nano-sheet with 0.5-1g of modifier and 150-300mL of distilled water to obtain a solution to be reacted;
the pH value of the solution to be reacted is adjusted to 8-9 by adopting tris (hydroxymethyl) aminomethane, and the solution is separated and dried after the reaction to obtain the modified heat-conducting filler;
mixing 500g of polymer, 5-10g of nano tube and 25-100g of modified heat conducting filler, and granulating to obtain modified polymer;
mixing 50-70 parts of polysulfone microspheres and 30-50 parts of the modified polymer, and then performing hot press molding to obtain a heat-conducting polysulfone composite material;
the mixed granulation adopts a double-screw extruder, wherein the temperature of a first region of the double-screw extruder is 200-240 ℃, the temperature of a second region of the double-screw extruder is 215-250 ℃, the temperature of a third region of the double-screw extruder is 220-260 ℃, the temperature of a fourth region of the double-screw extruder is 220-260 ℃, the temperature of a fifth region of the double-screw extruder is 230-270 ℃, the temperature of a sixth region of the double-screw extruder is 220-260 ℃, and the screw rotating speed of the double-screw extruder is 80-120rpm;
the hot press forming comprises a first hot press and a second hot press, wherein the temperature of the first hot press is 170-180 ℃, the pressure of the first hot press is 8-12MPa, the time of the first hot press is 8-12min, the temperature of the second hot press is 200-300 ℃, the pressure of the second hot press is 10-14MPa, and the time of the second hot press is 10-20min;
the polymer is polypropylene and/or polyethylene, and the nanotubes comprise boron nitride nanotubes and/or carbon nanotubes.
2. A method of preparing a thermally conductive polysulfone composite as recited in claim 1, wherein the method of preparing a thermally conductive polysulfone composite comprises:
mixing 0.5-2g of boron nitride nano-sheet, 0.5-1g of modifier and 150-300mL of distilled water to obtain a solution to be reacted;
the pH value of the solution to be reacted is adjusted to 8-9 by adopting tris (hydroxymethyl) aminomethane, and the solution is separated and dried after the reaction to obtain the modified heat-conducting filler;
mixing 500g of polymer, 5-10g of nano tube and 25-100g of modified heat conducting filler, and granulating to obtain modified polymer;
mixing 50-70 parts of polysulfone microspheres and 30-50 parts of the modified polymer, and then performing hot press molding to obtain a heat-conducting polysulfone composite material;
the mixed granulation adopts a double-screw extruder, wherein the temperature of a first region of the double-screw extruder is 200-240 ℃, the temperature of a second region of the double-screw extruder is 215-250 ℃, the temperature of a third region of the double-screw extruder is 220-260 ℃, the temperature of a fourth region of the double-screw extruder is 220-260 ℃, the temperature of a fifth region of the double-screw extruder is 230-270 ℃, the temperature of a sixth region of the double-screw extruder is 220-260 ℃, and the screw rotating speed of the double-screw extruder is 80-120rpm;
the hot press forming comprises a first hot press and a second hot press, wherein the temperature of the first hot press is 170-180 ℃, the pressure of the first hot press is 8-12MPa, the time of the first hot press is 8-12min, the temperature of the second hot press is 200-300 ℃, the pressure of the second hot press is 10-14MPa, and the time of the second hot press is 10-20min;
the polymer is polypropylene and/or polyethylene, and the nano-tube comprises boron nitride nano-tube and/or carbon nano-tube;
the modifier comprises at least one of dopamine and dopamine hydrochloride.
3. The method for preparing the heat-conducting polysulfone composite according to claim 2, wherein the separation is performed by using a polyethersulfone microporous filter membrane, the drying temperature is 50-70 ℃, and the drying time is 10-14h.
4. The method for preparing a heat conductive polysulfone composite according to claim 2, wherein the polysulfone microspheres have a particle size of 100-300 μm.
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