CN110042486B - Preparation method of high-orientation communicated BN composite fiber material - Google Patents
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- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
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- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
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Abstract
The invention discloses a preparation method of a high-orientation communicated BN composite fiber material, which comprises the steps of selecting BN nano sheets or BN nano particles with the diameter of 50-200nm, adding the BN nano sheets or the BN nano particles into a polymer solution to obtain an inner core spinning solution and an outer shell spinning solution, and carrying out coaxial oriented electrostatic spinning and mechanical stretching treatment to obtain the high-orientation communicated BN composite fiber material. The high-orientation communicated BN composite fiber material prepared by the invention improves the orientation of BN, forms a coherent and perfect heat conduction path, has better heat dissipation effect and better orientation in the field of heat dissipation and insulation, and has wide application prospect in the fields of microelectronic packaging, electrical insulation and LED illumination.
Description
Technical Field
The invention belongs to the field of composite fiber preparation, and relates to a preparation method of a high-orientation communicated BN composite fiber material.
Background
Boron Nitride (BN) is an excellent inorganic high-thermal-conductivity insulating material with a graphite-like structure, and has the characteristics of extremely high in-plane thermal conductivity, high temperature stability, high insulation resistance, high breakdown strength, low dielectric constant, low dielectric loss, excellent oxidation resistance, chemical corrosion resistance and the like, so that the BN is widely applied to the fields of aerospace, electrical engineering, microelectronic devices, metallurgical industry and the like.
The BN/polymer composite material has the advantages of low cost, no toxicity, environmental protection, convenient operation and the like, becomes a research hotspot in the current high-thermal-conductivity insulating material, and is widely applied to the fields of microelectronic packaging, electrical insulation, LED illumination and the like. Since the thermal conductivity of BN has anisotropy, the thermal conductivity in the in-plane direction is much higher than that in the thickness direction, and the heat conduction path formed by the orientation-aligned BN has extremely high thermal conductivity. Efficient preparation of thermally conductive and electrically insulating composites with highly oriented BN remains a great challenge.
Zhang et al (Zhang X, Shen L, et al, enhanced thermal conductivity and mechanical properties of Polyethylene (PE)/Boron Nitride (BN) Composites through multistage stretching extrusion [ J ]. Composites Science and Technology,2013,89:24-28.) found that BN particles were dispersed in a PE matrix after multistage stretching, more heat conduction paths were constructed, the thermal conductivity of the PE/composite was improved to some extent, and the mechanical properties were improved. But BN particles are discontinuously distributed in the matrix, the orientation is poor, and the heat conduction path is discontinuous, so that the further improvement of the heat conductivity of the composite material is limited.
Takahashi et al (Takahashi S, Imai Y, et al. electronic and thermal properties of anisotropic polypropylene/hexagonal boron nitride compositions for high-frequency applications [ J ]. Journal of Alloys and compositions, 2014,615(8): 141. times.145.) found that in injection molded BN/PP (polypropylene) samples, the BN orientation is much higher than in the hot pressing samples, and the thermal conductivity can reach 2.1W/(m. K). The orientation of BN can be improved by utilizing a mechanical stretching method, but the BN is discontinuously distributed in a matrix and a heat conduction path is not connected, so that the improvement of the heat conductivity of the composite material is limited to a great extent.
Shen et al (Shen H, Guo J, et al, bioinpipered modification of H-BN for high thermal conductive composite films with aligned structure [ J]ACS Appl Mater Interfaces 2015,7(10):5701-,the composite film with orderly arranged fillers is obtained by casting extrusion, and the finding shows that the h-BN filler with the oriented arrangement causes higher in-plane thermal conductivity relative to a disordered structure, and the thermal conductivity coefficient of the composite film is as high as 5.4Wm under the load of 10 vol% of h-BN @ PDA-1K-1. Although the BN orientation is aligned, the discontinuity still causes the heat conduction path to be discontinuous, and the increase of the heat conductivity of the composite material is influenced.
Chinese patent application No. 201810881867.0, application publication No. CN 109228549A, published date 2019.01.18 discloses a method for preparing a high-thermal-conductivity nanocellulose-based electrical insulation film material, which comprises the steps of freeze-drying a nanofiber solution and polyamide epichlorohydrin resin to obtain nanofiber aerogel, curing at a high temperature, filling uniformly dispersed h-BN suspension into pores of the nanofiber aerogel, drying, calendaring and the like to obtain the heat-conductivity nanocellulose-based heat-conducting insulation film material. However, BN is disordered, orientation arrangement cannot be realized, and the improvement of the thermal conductivity of the composite material is influenced.
Disclosure of Invention
The invention aims to provide a preparation method of a high-orientation communicated BN composite fiber material, which solves the problems of poor orientation and discontinuous heat conduction path of a composite BN in the prior art and improves the heat conduction performance of the composite material.
The invention adopts the technical scheme that the preparation method of the high-orientation communicated BN composite fiber material is implemented according to the following steps:
step 1, respectively preparing an outer shell spinning solution containing low-concentration BN and an inner core spinning solution containing high-concentration BN;
step 2, ultrasonically treating the shell spinning solution and the inner core spinning solution obtained in the step 1;
step 3, performing coaxial directional electrostatic spinning on the shell spinning solution and the spinning solution containing the inner core after ultrasonic treatment in the step 2;
and 4, mechanically stretching the BN composite fiber material prepared in the step 3.
The invention is also characterized in that:
the step 1 is implemented according to the following steps: adding a spinnable polymer, a BN nano material and a dispersing agent into a solvent to respectively prepare an outer shell spinning solution containing low-concentration BN and an inner core spinning solution containing high-concentration BN.
In the step 1, the BN nano material is formed by mixing BN nano short fibers with the diameter of 300-1000 nm and the length-diameter ratio of 5-100 and BN nano sheets with the diameter of 50-200 nm.
The spinnable polymer in the step 1 is any one of polyvinyl alcohol, polyvinylpyrrolidone, polystyrene and polyvinylidene fluoride; the proportion of the nano short fibers to the nano sheets in the BN nano material is 0: 1-1: 1; the dispersant is any one of polyvinylpyrrolidone, polyvinyl alcohol, polyethyleneimine and sodium polyacrylate; the solvent is one or more of water, absolute ethyl alcohol, N-dimethylformamide, N-dimethylacetamide, acetone and tetrahydrofuran.
The shell spinning solution prepared in the step 1 comprises the following substances in percentage by mass: 7-30% of spinnable polymer, 2-5% of BN nano material, 0-1% of dispersant and 64-91% of solvent, wherein the total amount of the components is 100%; the inner core spinning solution comprises the following substances in percentage by mass: 5-13% of spinnable polymer, 8-20% of BN nano material, 0-2% of dispersant and 65-87% of solvent, wherein the total amount of the components is 100%.
And 2, respectively carrying out ultrasonic treatment on the shell spinning solution and the inner core spinning solution obtained in the step 1 for 10-30 min.
Step 3 is specifically implemented according to the following steps: and (3) putting the shell spinning solution obtained in the step (2) into a shell layer propulsion pump, putting the inner core spinning solution into a core layer propulsion pump, selecting a certain spinning voltage, a certain receiving distance, a certain spinning temperature and a certain spinning humidity, respectively adjusting the propulsion speeds of the shell layer propulsion pump and the core layer propulsion pump, carrying out coaxial electrostatic spinning, receiving by using a roller, selecting a proper roller rotating speed, and collecting to obtain the composite fiber membrane with orientation.
The parameters of the coaxial directional electrostatic spinning in the step 3 are as follows: the rotating speed of the roller is 1500 r/min-2300 r/min, the spinning voltage is 16-24 kv, the receiving distance is 15 cm-22 cm, the spinning temperature is 20-30 ℃, the humidity is 10-30%, the advancing speed of the shell spinning solution is 0.3 mL/h-0.6 mL/h, and the advancing speed of the inner core spinning solution is as follows: 0.2mL/h to 0.35 mL/h.
Step 4 is specifically implemented according to the following steps: and (3) mechanically stretching the composite fiber membrane obtained in the step (3) along the fiber direction, wherein the stretching distance is 70-100 mm, the stretching speed is 1-3 mm/min, and the stretching time is 50-100 s, so that the high-orientation communicated BN composite fiber material is obtained.
The invention has the beneficial effects that: the high-orientation communicated BN composite fiber material is prepared through coaxial electrostatic spinning and mechanical stretching, BN nano materials with high heat conductivity coefficient and insulating property are fully utilized, nano short fibers and nano sheets are matched for use, gaps among the nano short fibers are filled and communicated by the nano sheets, the gaps of the nano sheets are communicated in a penetrating manner by the short fibers, and the nano short fibers and the nano sheets complement each other, so that BN is continuously distributed in the fibers to form a heat conduction path; in the coaxial spinning process, the high-density BN nano material at the core part is continuously distributed in the composite fiber, and the shell part is used for maintaining the continuity of the fiber and supplementing the thermal conductivity of the fiber by using the low-density BN nano material to form a high-density continuous BN heat conduction path; meanwhile, the composite fiber with orientation arrangement is prepared under the receiving action of the roller, the BN orientation is improved through the mechanical stretching action, the high-orientation communicated BN composite fiber material is formed, and the heat conduction path is continuous and complete, so that the heat dissipation effect is better in the heat dissipation and insulation field, the orientation is better, and the heat dissipation and insulation composite fiber material has wide application prospects in the fields of microelectronic packaging, electrical insulation and LED illumination.
Drawings
FIG. 1 is a schematic diagram of the mechanism of the high-orientation connected BN composite fiber material prepared by the invention;
fig. 2 is a physical diagram of a composite fiber membrane prepared in example 1 of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention relates to a preparation method of a high-orientation communicated BN composite fiber material, which is implemented by the following steps:
step 1, respectively preparing an outer shell spinning solution containing low-concentration BN and an inner core spinning solution containing high-concentration BN;
step 2, ultrasonically treating the shell spinning solution and the inner core spinning solution obtained in the step 1;
and 3, performing coaxial directional electrostatic spinning on the shell spinning solution and the spinning solution containing the inner core after ultrasonic treatment in the step 2.
Step 4, mechanically stretching the BN composite fiber material prepared in the step 3
The step 1 is implemented according to the following steps: adding a spinnable polymer, a BN nano material and a dispersing agent into a solvent to respectively prepare an outer shell spinning solution containing low-concentration BN and an inner core spinning solution containing high-concentration BN.
In the step 1, the BN nano material is formed by mixing BN nano short fibers with the diameter of 300-1000 nm and the length-diameter ratio of 5-100 and BN nano sheets with the diameter of 50-200 nm.
The spinnable polymer in the step 1 is any one of polyvinyl alcohol, polyvinylpyrrolidone, polystyrene and polyvinylidene fluoride; the proportion of the nano short fibers to the nano sheets in the BN nano material is 0: 1-1: 1; the dispersant is any one of polyvinylpyrrolidone, polyvinyl alcohol, polyethyleneimine and sodium polyacrylate; the solvent is one or more of water, absolute ethyl alcohol, N-dimethylformamide, N-dimethylacetamide, acetone and tetrahydrofuran.
The shell spinning solution prepared in the step 1 comprises the following substances in percentage by mass: 7-30% of spinnable polymer, 2-5% of BN nano material, 0-1% of dispersant and 64-91% of solvent, wherein the total amount of the components is 100%; the inner core spinning solution comprises the following substances in percentage by mass: 5-13% of spinnable polymer, 8-20% of BN nano material, 0-2% of dispersant and 65-87% of solvent, wherein the total amount of the components is 100%.
And 2, respectively carrying out ultrasonic treatment on the shell spinning solution and the inner core spinning solution obtained in the step 1 for 10-30 min.
Step 3 is specifically implemented according to the following steps: and (3) putting the shell spinning solution obtained in the step (2) into a shell layer propulsion pump, putting the inner core spinning solution into a core layer propulsion pump, selecting a certain spinning voltage, a certain receiving distance, a certain spinning temperature and a certain spinning humidity, respectively adjusting the propulsion speeds of the shell layer propulsion pump and the core layer propulsion pump, carrying out coaxial electrostatic spinning, receiving by using a roller, selecting a proper roller rotating speed, and collecting to obtain the composite fiber membrane with orientation.
The parameters of the coaxial directional electrostatic spinning in the step 3 are as follows: the rotating speed of the roller is 1500 r/min-2300 r/min, the spinning voltage is 16-24 kv, the receiving distance is 15 cm-22 cm, the spinning temperature is 20-30 ℃, the humidity is 10-30%, the advancing speed of the shell spinning solution is 0.3 mL/h-0.6 mL/h, and the advancing speed of the inner core spinning solution is as follows: 0.2mL/h to 0.35 mL/h.
Step 4 is specifically implemented according to the following steps: and (3) mechanically stretching the composite fiber membrane obtained in the step (3) along the fiber direction, wherein the stretching distance is 70-100 mm, the stretching speed is 1-3 mm/min, and the stretching time is 50-100 s, so that the high-orientation communicated BN composite fiber material is obtained.
As shown in fig. 1, in the BN nanomaterial, short nanofibers are used in cooperation with the nanosheets, gaps between the short nanofibers are filled and communicated by the nanosheets, and gaps between the nanosheets are penetrated and communicated by the short fibers, which complement each other, such that BN is continuously distributed in the fiber to form a heat conducting path; in the coaxial spinning process, the high-density BN nano material at the core part is continuously distributed in the composite fiber, and the shell part is used for maintaining the continuity of the fiber and supplementing the thermal conductivity of the fiber by using the low-density BN nano material to form a high-density continuous BN heat conduction path; meanwhile, certain orientation alignment appears under the receiving action of the roller, and the composite fiber with orientation alignment is prepared; after subsequent mechanical stretching treatment, the orientation of the BN nano material of the coaxial fiber core part is further improved, and meanwhile, the BN nano material of the coaxial fiber shell part has a supplementary effect on the core part, so that the continuity of the core part is improved, a heat conduction path of the core part is perfected, and a positive effect on the improvement of the mechanical property of the core part is also achieved.
As can be seen in fig. 2: the fibers were aligned and had a diameter size of about 1 micron.
Embodiment 1 preparation method of high-orientation communicated BN-PVA composite fiber
Step 1, completely dissolving 1g of polyvinyl alcohol in 17.4g of solvent water, adding 1.6g of BN nano short fiber with the diameter of 300-400 nm and the length-diameter ratio of 5 and BN nano sheet with the diameter of 50-100 nm to form a mixed BN nano material, wherein the proportion of the BN nano short fiber to the BN nano material is 1:1, and uniformly mixing to obtain an inner core spinning solution; dissolving 1.4g of polyvinyl alcohol in 18.2g of solvent water, adding 0.4g of the BN nano material, and uniformly mixing to obtain a shell spinning solution;
step 2, carrying out ultrasonic treatment on the inner core spinning solution for 10min and carrying out ultrasonic treatment on the outer shell spinning solution for 30 min;
step 3, placing the shell spinning solution into a shell layer propulsion pump, placing the inner core spinning solution into a core layer propulsion pump, carrying out coaxial electrostatic spinning with a spinning voltage of 16kv, a receiving distance of 15cm, a spinning temperature of 20 ℃, a humidity of 10%, a shell spinning solution propulsion speed of 0.3mL/h and an inner core spinning solution propulsion speed of 0.2mL/h, receiving by using a roller, selecting the rotating speed of the roller to be 1500r/min, and collecting to obtain a composite fiber membrane with orientation;
and 4, mechanically stretching the composite fiber film along the fiber direction, wherein the stretching distance is 70mm, the stretching speed is 1mm/min, and the stretching time is 100s, so that the high-orientation communicated BN-PVA composite fiber material is obtained.
Example 2 preparation method of high-orientation connected BN-PVP composite fiber
Step 1, firstly, completely dissolving 1.4g of polyvinylpyrrolidone in 16g of solvent ethanol, adding 0.2g of polyethylene glycol and BN nano material formed by mixing BN nano short fibers with the diameter of 900-1000 nm and the length-diameter ratio of 100 and BN nano sheets with the diameter of 150-200 nm, wherein the proportion of the BN nano short fibers to the BN nano material is 0.5:1, and uniformly mixing to obtain an inner core spinning solution; dissolving 1.8g of polyvinylpyrrolidone in 17.5g of ethanol solvent, adding 0.4g of the BN nano material and 0.1g of polyethylene glycol, and uniformly mixing to obtain shell spinning solution;
step 2, carrying out ultrasonic treatment on the inner core spinning solution for 15min, and carrying out ultrasonic treatment on the outer shell spinning solution for 30 min;
step 3, putting the shell spinning solution into a shell layer propulsion pump, putting the inner core spinning solution into a core layer propulsion pump, wherein the spinning voltage is 24kv, the receiving distance is 22cm, the spinning temperature is 30 ℃, the humidity is 30%, the propulsion speed of the shell spinning solution is 0.4mL/h, and the propulsion speed of the inner core spinning solution is: and (3) carrying out coaxial electrostatic spinning at the speed of 0.3mL/h, receiving by using a roller, selecting the rotating speed of the roller to be 2000r/min, and collecting to obtain the composite fiber membrane with orientation.
Step 4, mechanically stretching the composite fiber membrane along the fiber direction, wherein the stretching distance is 100mm, the stretching speed is 2mm/min, and the stretching time is 80s, so as to obtain the high-orientation communicated BN-PVP composite fiber material;
example 3 preparation method of high-orientation connected BN-PS composite fiber
Step 1, firstly, completely dissolving 2.6g of polystyrene in 13g of solvent N, N-dimethylformamide, adding 4g of BN nano material formed by mixing BN nano short fiber with the diameter of 500-600 nm and the length-diameter ratio of 20 and BN nano sheet with the diameter of 50-100 nm and 0.4g of polyethyleneimine, wherein the proportion of the BN nano short fiber to the BN nano material is 0.3:1, and uniformly mixing to obtain an inner core spinning solution; completely dissolving 6g of polystyrene in 12.8g of solvent N, N-dimethylformamide, adding 1g of the BN nano material and 0.2g of polyethyleneimine, and uniformly mixing to obtain the shell spinning solution.
Step 2, carrying out ultrasonic treatment on the inner core spinning solution for 20min and carrying out ultrasonic treatment on the outer shell spinning solution for 30 min;
step 3, placing the shell spinning solution into a shell layer propulsion pump, placing the inner core spinning solution into a core layer propulsion pump, carrying out coaxial electrostatic spinning with a spinning voltage of 22kv, a receiving distance of 18cm, a spinning temperature of 25 ℃, a humidity of 25%, a shell spinning solution propulsion speed of 0.6mL/h and an inner core spinning solution propulsion speed of 0.35mL/h, receiving by using a roller, selecting the rotating speed of the roller to be 2000r/min, and collecting to obtain a composite fiber membrane with orientation;
and 4, mechanically stretching the composite fiber membrane along the fiber direction, wherein the stretching distance is 80mm, the stretching speed is 3mm/min, and the stretching time is 50s, so that the high-orientation communicated BN-PS composite fiber material is obtained.
Example 4 preparation method of high-orientation communicated BN-PVDF composite fiber
Step 1, completely dissolving 2.4g of polyvinylidene fluoride in 14.3g of solvent acetone, adding 3g of BN nano-sheet with the diameter of 100-150 nm and 0.3g of sodium polyacrylate, and uniformly mixing to obtain an inner core spinning solution; completely dissolving 3g of polyvinylidene fluoride in 16.12g of solvent acetone, adding 0.8g of BN nanosheet and 0.08g of sodium polyacrylate, and uniformly mixing to obtain a shell spinning solution;
step 2, carrying out ultrasonic treatment on the inner core spinning solution for 10min and carrying out ultrasonic treatment on the outer shell spinning solution for 10 min;
step 3, putting the shell spinning solution into a shell layer propulsion pump, putting the inner core spinning solution into a core layer propulsion pump, carrying out coaxial electrostatic spinning with a spinning voltage of 20kv, a receiving distance of 18cm, a spinning temperature of 20 ℃, a humidity of 15%, a shell spinning solution propulsion speed of 0.35mL/h and an inner core spinning solution propulsion speed of 0.25mL/h, receiving by using a roller, selecting a roller rotation speed of 1800r/min, and collecting to obtain a composite fiber membrane with orientation;
and 4, mechanically stretching the composite fiber membrane along the fiber direction, wherein the stretching distance is 70mm, the stretching speed is 1mm/min, and the stretching time is 80s, so that the high-orientation communicated BN-PVDF composite fiber material is obtained.
Example 5 preparation method of high-orientation communicated BN-PVDF composite fiber
Step 1, completely dissolving 2g of polyvinylidene fluoride in a mixed solvent composed of 8g of N, N-dimethylacetamide and 5.8g of acetone, adding 4g of a BN nano material formed by mixing BN nano short fibers with the diameter of 600-700 nm and the length-diameter ratio of 60 and BN nano sheets with the diameter of 100-150 nm and 0.2g of polyethyleneimine, wherein the proportion of the BN nano short fibers to the BN nano material is 0.2:1, and uniformly mixing to obtain an inner core spinning solution; completely dissolving 3.4g of polyvinylidene fluoride in a mixed solvent consisting of 10g of N, N-dimethylacetamide and 5.9g of acetone, adding 0.6g of the BN nano material and 0.1g of polyethyleneimine, and uniformly mixing to obtain a shell spinning solution;
step 2, carrying out ultrasonic treatment on the inner core spinning solution for 20min and carrying out ultrasonic treatment on the outer shell spinning solution for 30 min;
step 3, putting the shell spinning solution into a shell layer propulsion pump, putting the inner core spinning solution into a core layer propulsion pump, wherein the spinning voltage is 18kv, the receiving distance is 15cm, the spinning temperature is 20 ℃, the humidity is 10%, the propulsion speed of the shell spinning solution is 0.5mL/h, and the propulsion speed of the inner core spinning solution is as follows: and (3) carrying out coaxial electrostatic spinning at the speed of 0.2mL/h, receiving by using a roller, selecting the rotating speed of the roller to be 2300r/min, and collecting to obtain the composite fiber membrane with orientation.
And 4, mechanically stretching the composite fiber membrane along the fiber direction, wherein the stretching distance is 90mm, the stretching speed is 2mm/min, and the stretching time is 70s, so that the high-orientation communicated BN-PVDF composite fiber material is obtained.
Claims (4)
1. A preparation method of a high-orientation communicated BN composite fiber material is characterized by comprising the following steps:
step 1, respectively preparing an outer shell spinning solution containing low-concentration BN and an inner core spinning solution containing high-concentration BN;
adding a spinnable polymer, a BN nano material and a dispersing agent into a solvent, and respectively preparing an outer shell spinning solution containing low-concentration BN and an inner core spinning solution containing high-concentration BN; the BN nano material is formed by mixing BN nano short fibers with the diameter of 300-1000 nm and the length-diameter ratio of 5-100 with BN nano sheets with the diameter of 50-200 nm;
the prepared shell spinning solution consists of the following substances in percentage by mass: 7-30% of spinnable polymer, 2-5% of BN nano material, 0-1% of dispersant and 64-91% of solvent, wherein the total amount of the components is 100%; the inner core spinning solution comprises the following substances in percentage by mass: 5-13% of spinnable polymer, 8-20% of BN nano material, 0-2% of dispersant and 65-87% of solvent, wherein the sum of the components is 100%;
step 2, ultrasonically treating the shell spinning solution and the inner core spinning solution obtained in the step 1;
step 3, performing coaxial directional electrostatic spinning on the shell spinning solution and the spinning solution containing the inner core after ultrasonic treatment in the step 2; the method is implemented according to the following steps:
putting the shell spinning solution obtained in the step (2) into a shell layer propulsion pump, putting an inner core spinning solution into a core layer propulsion pump, selecting a certain spinning voltage, a certain receiving distance, a certain spinning temperature and a certain spinning humidity, respectively adjusting the propulsion speeds of the shell layer propulsion pump and the core layer propulsion pump, carrying out coaxial electrostatic spinning, receiving by using a roller, selecting a proper roller rotating speed, and collecting to obtain a composite fiber membrane with orientation;
step 4, performing mechanical stretching treatment on the composite fiber membrane prepared in the step 3 to obtain a BN composite fiber material;
the method is implemented according to the following steps: and (3) mechanically stretching the composite fiber membrane obtained in the step (3) along the fiber direction, wherein the stretching distance is 70-100 mm, the stretching speed is 1-3 mm/min, and the stretching time is 50-100 s, so that the high-orientation communicated BN composite fiber material is obtained.
2. The method for preparing a BN composite fiber material with high orientation connectivity according to claim 1, wherein the spinnable polymer in the step 1 is any one of polyvinyl alcohol, polyvinylpyrrolidone, polystyrene and polyvinylidene fluoride; the proportion of the nano short fibers to the nano sheets in the BN nano material is 0.2: 1-1: 1; the dispersant is any one of polyvinylpyrrolidone, polyvinyl alcohol, polyethyleneimine and sodium polyacrylate; the solvent is one or more of water, absolute ethyl alcohol, N-dimethylformamide, N-dimethylacetamide, acetone and tetrahydrofuran.
3. The method for preparing a high orientation linked BN composite fiber material according to claim 1, wherein the shell spinning solution and the core spinning solution obtained in step 2 are respectively subjected to ultrasonic treatment for 10-30 min.
4. The method for preparing a BN composite fiber material with high orientation connectivity according to claim 1, wherein the parameters of the coaxial directional electrostatic spinning in the step 3 are as follows: the rotating speed of the roller is 1500 r/min-2300 r/min, the spinning voltage is 16-24 kV, the receiving distance is 15 cm-22 cm, the spinning temperature is 20-30 ℃, the humidity is 10-30%, the advancing speed of the shell spinning solution is 0.3 mL/h-0.6 mL/h, and the advancing speed of the inner core spinning solution is as follows: 0.2mL/h to 0.35 mL/h.
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| CN115323612B (en) * | 2022-08-19 | 2024-06-07 | 佛山清立新材料科技有限公司 | High-heat-conductivity composite material and preparation method thereof |
| CN115674818A (en) * | 2022-12-30 | 2023-02-03 | 江苏鑫济源新材料科技有限公司 | Aluminum-plastic plate with high heat dissipation performance and preparation method thereof |
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