CN106480533B - A kind of polymide dielectric heat-conductive composite material and preparation method thereof - Google Patents
A kind of polymide dielectric heat-conductive composite material and preparation method thereof Download PDFInfo
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- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
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- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
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Abstract
The present invention provides a kind of polymide dielectric heat-conductive composite materials and preparation method thereof, with 1,3, two ether diamine APB of 4- triphenyl, 4, the double phthalic anhydride 6FDA and 1 of 4- (hexafluoro isopropyl), 3- diaminopropyl tetramethyl disiloxane GAPD is raw material, cubic boron nitride hBN is heat filling, hBN/ polyamic acid heat conduction composite fiber is prepared using in-situ polymerization-method of electrostatic spinning, then cuts out the hBN/PI dielectric heat-conductive composite material of stacking-die press technology for forming preparation high thermal conductivity, low dielectric through hot imidization-.HBN/PI dielectric heat-conductive composite material prepared by the present invention has many advantages, such as high thermal conductivity, low dielectric and excellent heat resistance.
Description
Technical field
The present invention relates to a kind of dielectric heat-conductive composite material, especially a kind of polymide dielectric heat-conductive composite material, also
It is related to the preparation method of this polymide dielectric heat-conductive composite material.
Background technique
Polyimides (PI) has heat resistance outstanding, excellent chemical stability, good electrical insulating property and excellent
Many advantages, such as mechanical performance, has wide practical use in high-technology fields such as Aeronautics and Astronautics, optics and electronic equipments.
However, PI itself heating conduction is poor (thermal coefficient λ is 0.174W/mK), keep its application limited.In order to further expand PI in electricity
The application of the high heat transfers such as sub- component and integrated circuit and heat dissipation occasion, the heating conduction for improving PI matrix is key problem in technology.
The research of domestic and international PI dielectric heat-conductive composite material is relatively fewer, mostly uses fill single high thermal conductivity, low Jie greatly
The inorganic filler of electricity prepares PI heat-conductive composite material.Boron nitride is because having high thermal coefficient (λ), low dielectric constant (ε)
Many advantages, such as with dielectric loss angle tangent (tan δ), excellent inoxidizability and corrosion resistance, becomes preparation PI and is situated between
The ideal modified additive of electric heat-conductive composite material.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of polyimides heat-conductive composite material, with 1,3,4- tri-
Two ether diamine of phenyl (APB), 4,4- (hexafluoro isopropyl) double phthalic anhydrides (6FDA) and 1,3- diaminopropyl tetramethyl
Disiloxane (GAPD) is raw material, and cubic boron nitride (hBN) is heat filling, is prepared using in-situ polymerization-method of electrostatic spinning
HBN/ polyamic acid (hBN/PAA) heat conduction composite fiber felt, then be prepared through hot imidization-die press technology for forming, hBN/ is poly-
Acid imide acid (hBN/PI) dielectric heat-conductive composite material has the advantages that high thermal conductivity, low dielectric.
The technical solution adopted by the present invention to solve the technical problems is: a kind of polymide dielectric heat-conductive composite material,
It is laminated using the superposition of several layers heat conduction composite fiber felt, the component of every layer of heat conduction composite fiber felt includes 70~95 parts by weight
Polyimides and 5~30 parts by weight cubic boron nitride.
The present invention also provides a kind of preparation methods of polymide dielectric heat-conductive composite material, comprising the following steps:
(a) two ether diamine of 1,3,4- triphenyl of 6.5~7.5 parts by weight is mixed into 75~86 weight under the conditions of ice-water bath
The DMAC N,N' dimethyl acetamide of part；After being completely dissolved to 1,3,4- triphenyl, two ether diamine, then divide several times be added 10.6~
4,4- (hexafluoro isopropyl) double phthalic anhydrides of 12.3 parts by weight；It is complete to 4,4- (hexafluoro isopropyl) double phthalic anhydrides
After portion is added and dissolves, 1, the 3- diaminopropyl tetramethyl disiloxane of 0.29~0.34 parts by weight, mechanical stirring is added
30min；The cubic boron nitride of 5~30 parts by weight is added, continues 30~60min of stirring, in-situ polymerization obtains cubic boron nitride/polyamides
Amino acid solution；
(b) cubic boron nitride/polyamic acid solution is subjected to electrostatic spinning, it is thermally conductive obtains cubic boron nitride/polyamic acid
Composite fibrofelt；
(c) cubic boron nitride/polyamic acid heat conduction composite fiber felt is removed to solvent 4h at 60 DEG C of vacuum；Then with 1 DEG C/
The heating rate of min is heated to 120 DEG C of heat preservation 1h, 200 DEG C of heat preservation 1h is heated to the heating rate of 1 DEG C/min, with 1 DEG C/min
Heating rate be heated to 250 DEG C of heat preservation 1h, carry out hot imidization；It is cooled to room temperature taking-up, obtains cubic boron nitride/polyimides
Heat conduction composite fiber felt；
(d) several layers cubic boron nitride/polyimides heat conduction composite fiber felt is pressed and molded, obtain cubic boron nitride/
Polyimides heat conduction composite fiber felt dielectric heat-conductive composite material；The temperature of the compression molding is 290~320 DEG C, pressure 5
~10MPa, time are 10~15min.
In the step (a), 4,4- (hexafluoro isopropyl) the double phthalic anhydrides added every time be completely dissolved after again
4,4- (hexafluoro isopropyl) double phthalic anhydrides of next batch are added.
In the step (a), the weight of 4,4- (hexafluoro isopropyl) the double phthalic anhydrides added every time is no more than
0.2g。
In the step (b), cubic boron nitride/polyamic acid solution is packed into the injection needle for being furnished with metal needle
In, then injection needle is horizontally fixed on injection apparatus, by the high voltage power supply positive electrode and metal needle of electrostatic spinning machine
It is connected, tinfoil paper is collected paper bag and overlayed on cylinder shape negative electrode, and injection needle aligns with drum center keeps the work of electrostatic spinning machine
Room is sealing state, and keeping work room temperature is 18~25 DEG C, and envionmental humidity is 50%~60%, high-voltage power voltage
For 15kV~25kV, the distance of syringe needle to centre of the drum is 15~20cm, and the revolving speed of roller is 40m/min.
In the step (d), weigh cubic boron nitride/polyimides heat conduction composite fiber felt 2g, be cut into having a size of
The sample of 20 × 20mm is fitted into mold, is pressed and molded on tablet vulcanizer.
The beneficial effects of the present invention are: the method due to being combined using in-situ polymerization, electrostatic spinning and compression molding, real
Show the evenly dispersed of PI intrinsic silicon hBN and aligned, obtains the thermal coefficient λ of hBN/PI dielectric heat-conductive composite material
Apparent to improve, dielectric constant (ε) and dielectric loss angle tangent (tan δ) are relatively low.Thermal coefficient λ is by the prior art
0.174W/mK be increased to 0.233W/mK~0.696W/mK；Dielectric constant (ε) value is between 3.21~3.77, dielectric loss
Angle tangent value (tan δ) is between 0.0038~0.0070.
Specific embodiment
Below with reference to embodiment, the present invention is further described, and the invention includes, but is not limited to, the following examples.
The present invention prepares a kind of polymide dielectric heat-conductive composite material using " hot imidization-compression molding " method, special
Point is prepared by the polyimides (PI) of 70%~95% weight and the cubic boron nitride (hBN) of 5%~30% weight.Its
Middle PI is the 4,4- of two ether diamine of 1,3,4- triphenyl (APB) by 6.5%~7.5% weight, 10.6%~12.3% weight
Two silicon of 1,3- diaminopropyl tetramethyl of (hexafluoro isopropyl) double phthalic anhydrides (6FDA), 0.29%~0.34% weight
Oxygen alkane (GAPD) and the DMAC N,N' dimethyl acetamide (DMAc) of 75%~86% weight are prepared through two-step method.
A kind of preparation method of polymide dielectric heat-conductive composite material, includes the following steps:
(a) APB of 6.5%~7.5% weight is put into the three-necked flask equipped with blender and nitrogen conduit, ice-water bath
Under the conditions of be added 75%~86% weight DMAc, after APB is completely dissolved, in batches by the 6FDA of 10.6%~12.3% weight
(every batch of 6FDA weight is no more than 0.2000g, adds down and criticizes after upper crowd 6FDA is completely dissolved) is added.It is all added to 6FDA
And after dissolving, the GAPD of 0.29%~0.34% weight is added.The hBN of 5%~30% weight is added in mechanical stirring 30min, after
30~60min of continuous stirring, in-situ polymerization obtain hBN/ polyamic acid (hBN/PAA) solution；
(b) it will be fitted into through the hBN/PAA solution of step (a) in the 8ml injection needle equipped with metal needle, it then will injection
Needle tubing is horizontally fixed on injection apparatus, and the high voltage power supply positive electrode tab of electrostatic spinning machine is connected with metal needle, tinfoil paper
It collects paper bag to overlay on cylinder shape negative electrode, the center of injection needle aligns with drum, it is close for keeping the operating room of electrostatic spinning machine
Envelope state, and keeping work room temperature is 18~25 DEG C, high voltage power supply is 15kV~25kV, and the distance of syringe needle to centre of the drum is
15cm~20cm, envionmental humidity are 50%~60%, and the revolving speed of roller is 40m/min, and it is thermally conductive that electrostatic spinning obtains hBN/PAA
Composite fibrofelt；
(c) the hBN/PAA heat conduction composite fiber felt through step (b) is removed into solvent 4h for 60 DEG C in vacuum drying oven, by 120
DEG C/1h+200 DEG C/1h+250 DEG C/1h, heating rate is the program progress hot imidization of 1 DEG C/min, is cooled to room temperature taking-up, obtains
HBN/ polyimides (hBN/PI) heat conduction composite fiber felt；
(d) the hBN/PI heat conduction composite fiber felt 2.00g through step (c) is weighed, the loading of 20mm × 20mm sample is cut to
In mold, compression molding preparation hBN/PI dielectric heat-conductive composite material, molding temperature 290 DEG C~320 on tablet vulcanizer
DEG C, pressure is 5MPa~10MPa, and clamp time is 10~15min.
Embodiment 1: the APB of 1.6078g is put into the three-necked flask equipped with blender and nitrogen conduit, ice-water bath condition
The 6FDA of 2.6656g is added portionwise after APB is completely dissolved, then is all added simultaneously to 6FDA by the lower DMAc that 13.5200g is added
After dissolution, the GAPD of 0.0745g is added, the hBN of 0.1527g is added after mechanical stirring 30min, continues to stir 30min, it is in situ poly-
Close to obtain hBN/PAA solution；HBN/PAA solution is fitted into the 8ml injection needle equipped with metal needle, then by injection needle water
It is flat to be fixed on injection apparatus, the high voltage power supply positive electrode tab of electrostatic spinning machine is connected with metal needle, tinfoil paper collects paper
It is coated on cylinder shape negative electrode, the center of injection needle aligns with drum, keeping the operating room of electrostatic spinning machine is sealing state,
And keeping work room temperature is 18 DEG C, electrostatic positive voltage is 15kV, operating distance 15cm, and envionmental humidity 50% connects
Receipts axis revolving speed is 40m/min, and electrostatic spinning obtains hBN/PAA heat conduction composite fiber felt, in vacuum drying oven 60 DEG C except after solvent 4h
By 120 DEG C/1h+200 DEG C/1h+250 DEG C/1h, the program that heating rate is 1 DEG C/min carries out hot imidization, is cooled to room temperature and takes
Out, hBN/PI heat conduction composite fiber felt is obtained；2.00g hBN/PI heat conduction composite fiber felt is cut to 20mm × 20mm sample dress
Enter in mold, the compression molding preparation hBN/PI dielectric heat-conductive composite material on tablet vulcanizer, 290 DEG C of molding temperature, pressure
Power is 5MPa, clamp time 10min.
After tested, the λ of made hBN/PI dielectric heat-conductive composite material is 0.233W/mK, and ε is that 3.21, tan δ is 0.0038.
Embodiment 2: the APB of 1.6078g is put into the three-necked flask equipped with blender and nitrogen conduit, ice-water bath condition
The 6FDA of 2.6656g is added portionwise after APB is completely dissolved, then is all added simultaneously to 6FDA by the lower DMAc that 22.3600g is added
After dissolution, the GAPD of 0.0745g is added, the hBN of 1.2437g is added after mechanical stirring 30min, continues to stir 60min, it is in situ poly-
Close to obtain hBN/PAA solution；HBN/PAA solution is fitted into the 8ml injection needle equipped with metal needle, then by injection needle water
It is flat to be fixed on injection apparatus, the high voltage power supply positive electrode tab of electrostatic spinning machine is connected with metal needle, tinfoil paper collects paper
It is coated on cylinder shape negative electrode, the center of injection needle aligns with drum, keeping the operating room of electrostatic spinning machine is sealing state,
And keeping work room temperature is 25 DEG C, electrostatic positive voltage is 25kV, operating distance 20cm, and envionmental humidity 60% connects
Receipts axis revolving speed is 40m/min, and electrostatic spinning obtains hBN/PAA heat conduction composite fiber felt, in vacuum drying oven 60 DEG C except after solvent 4h
By 120 DEG C/1h+200 DEG C/1h+250 DEG C/1h, the program that heating rate is 1 DEG C/min carries out hot imidization, is cooled to room temperature and takes
Out, hBN/PI heat conduction composite fiber felt is obtained；2.00g hBN/PI heat conduction composite fiber felt is cut to 20mm × 20mm sample dress
Enter in mold, the compression molding preparation hBN/PI dielectric heat-conductive composite material on tablet vulcanizer, 320 DEG C of molding temperature, pressure
Power is 10MPa, clamp time 15min.
After tested, the λ of made hBN/PI dielectric heat-conductive composite material is 0.696W/mK, and ε is that 3.77, tan δ is 0.0070.
Embodiment 3: the APB of 1.6078g is put into the three-necked flask equipped with blender and nitrogen conduit, ice-water bath condition
The 6FDA of 2.6656g is added portionwise after APB is completely dissolved, then is all added simultaneously to 6FDA by the lower DMAc that 14.7900g is added
After dissolution, the GAPD of 0.0745g is added, the hBN of 0.3224g is added after mechanical stirring 30min, continues to stir 35min, it is in situ poly-
Close to obtain hBN/PAA solution；HBN/PAA solution is fitted into the 8ml injection needle equipped with metal needle, then by injection needle water
It is flat to be fixed on injection apparatus, the high voltage power supply positive electrode tab of electrostatic spinning machine is connected with metal needle, tinfoil paper collects paper
It is coated on cylinder shape negative electrode, the center of injection needle aligns with drum, keeping the operating room of electrostatic spinning machine is sealing state,
And keeping work room temperature is 20 DEG C, electrostatic positive voltage is 20kV, operating distance 18cm, and envionmental humidity 55% connects
Receipts axis revolving speed is 40m/min, and electrostatic spinning obtains hBN/PAA heat conduction composite fiber felt, in vacuum drying oven 60 DEG C except after solvent 4h
By 120 DEG C/1h+200 DEG C/1h+250 DEG C/1h, the program that heating rate is 1 DEG C/min carries out hot imidization, is cooled to room temperature and takes
Out, hBN/PI heat conduction composite fiber felt is obtained；2.00g hBN/PI heat conduction composite fiber felt is cut to 20mm × 20mm sample dress
Enter in mold, the compression molding preparation hBN/PI dielectric heat-conductive composite material on tablet vulcanizer, 300 DEG C of molding temperature, pressure
Power is 5MPa, clamp time 10min.
After tested, the λ of made hBN/PI dielectric heat-conductive composite material is 0.264W/mK, and ε is that 3.38, tan δ is 0.0043.
Embodiment 4: the APB of 1.6078g is put into the three-necked flask equipped with blender and nitrogen conduit, ice-water bath condition
The 6FDA of 2.6656g is added portionwise after APB is completely dissolved, then is all added simultaneously to 6FDA by the lower DMAc that 20.0000g is added
After dissolution, the GAPD of 0.0745g is added, the hBN of 0.9673g is added after mechanical stirring 30min, continues to stir 50min, it is in situ poly-
Close to obtain hBN/PAA solution；HBN/PAA solution is fitted into the 8ml injection needle equipped with metal needle, then by injection needle water
It is flat to be fixed on injection apparatus, the high voltage power supply positive electrode tab of electrostatic spinning machine is connected with metal needle, tinfoil paper collects paper
It is coated on cylinder shape negative electrode, the center of injection needle aligns with drum, keeping the operating room of electrostatic spinning machine is sealing state,
And keeping work room temperature is 22 DEG C, electrostatic positive voltage is 25kV, operating distance 20cm, and envionmental humidity 60% connects
Receipts axis revolving speed is 40m/min, and electrostatic spinning obtains hBN/PAA heat conduction composite fiber felt, in vacuum drying oven 60 DEG C except after solvent 4h
By 120 DEG C/1h+200 DEG C/1h+250 DEG C/1h, the program that heating rate is 1 DEG C/min carries out hot imidization, is cooled to room temperature and takes
Out, hBN/PI heat conduction composite fiber felt is obtained；2.00g hBN/PI heat conduction composite fiber felt is cut to 20mm × 20mm sample dress
Enter in mold, the compression molding preparation hBN/PI dielectric heat-conductive composite material on tablet vulcanizer, 320 DEG C of molding temperature, pressure
Power is 10MPa, clamp time 12min.
After tested, the λ of made hBN/PI dielectric heat-conductive composite material is 0.546W/mK, and ε is that 3.66, tan δ is 0.0060.
Embodiment 5: the APB of 1.6078g is put into the three-necked flask equipped with blender and nitrogen conduit, ice-water bath condition
The 6FDA of 2.6656g is added portionwise after APB is completely dissolved, then is all added simultaneously to 6FDA by the lower DMAc that 16.2700g is added
After dissolution, the GAPD of 0.0745g is added, the hBN of 0.5122g is added after mechanical stirring 30min, continues to stir 40min, it is in situ poly-
Close to obtain hBN/PAA solution；HBN/PAA solution is fitted into the 8ml injection needle equipped with metal needle, then by injection needle water
It is flat to be fixed on injection apparatus, the high voltage power supply positive electrode tab of electrostatic spinning machine is connected with metal needle, tinfoil paper collects paper
It is coated on cylinder shape negative electrode, the center of injection needle aligns with drum, keeping the operating room of electrostatic spinning machine is sealing state,
And keeping work room temperature is 20 DEG C, electrostatic positive voltage is 20kV, operating distance 18cm, and envionmental humidity 55% connects
Receipts axis revolving speed is 40m/min, and electrostatic spinning obtains hBN/PAA heat conduction composite fiber felt, in vacuum drying oven 60 DEG C except after solvent 4h
By 120 DEG C/1h+200 DEG C/1h+250 DEG C/1h, the program that heating rate is 1 DEG C/min carries out hot imidization, is cooled to room temperature and takes
Out, hBN/PI heat conduction composite fiber felt is obtained；2.00g hBN/PI heat conduction composite fiber felt is cut to 20mm × 20mm sample dress
Enter in mold, the compression molding preparation hBN/PI dielectric heat-conductive composite material on tablet vulcanizer, 300 DEG C of molding temperature, pressure
Power is 5MPa, clamp time 12min.
After tested, the λ of made hBN/PI dielectric heat-conductive composite material is 0.346W/mK, and ε is that 3.48, tan δ is 0.0050.
Embodiment 6: the APB of 1.6078g is put into the three-necked flask equipped with blender and nitrogen conduit, ice-water bath condition
The 6FDA of 2.6656g is added portionwise after APB is completely dissolved, then is all added simultaneously to 6FDA by the lower DMAc that 17.9800g is added
After dissolution, the GAPD of 0.0745g is added, the hBN of 0.7255g is added after mechanical stirring 30min, continues to stir 45min, it is in situ poly-
Close to obtain hBN/PAA solution；HBN/PAA solution is fitted into the 8ml injection needle equipped with metal needle, then by injection needle water
It is flat to be fixed on injection apparatus, the high voltage power supply positive electrode tab of electrostatic spinning machine is connected with metal needle, tinfoil paper collects paper
It is coated on cylinder shape negative electrode, the center of injection needle aligns with drum, keeping the operating room of electrostatic spinning machine is sealing state,
And keeping work room temperature is 22 DEG C, electrostatic positive voltage is 25kV, operating distance 20cm, and envionmental humidity 60% connects
Receipts axis revolving speed is 40m/min, and electrostatic spinning obtains hBN/PAA heat conduction composite fiber felt, in vacuum drying oven 60 DEG C except after solvent 4h
By 120 DEG C/1h+200 DEG C/1h+250 DEG C/1h, the program that heating rate is 1 DEG C/min carries out hot imidization, is cooled to room temperature and takes
Out, hBN/PI heat conduction composite fiber felt is obtained；2.00g hBN/PI heat conduction composite fiber felt is cut to 20mm × 20mm sample dress
Enter in mold, the compression molding preparation hBN/PI dielectric heat-conductive composite material on tablet vulcanizer, 310 DEG C of molding temperature, pressure
Power is 10MPa, clamp time 15min.
After tested, the λ of made hBN/PI dielectric heat-conductive composite material is 0.479W/mK, and ε is that 3.60, tan δ is 0.0056.
Claims (5)
1. a kind of polymide dielectric heat-conductive composite material, it is characterised in that: use several layers heat conduction composite fiber felt superimposed layer
It presses, the component of every layer of heat conduction composite fiber felt includes the polyimides of 70~95 parts by weight and cube of 5~30 parts by weight
Boron nitride；
The preparation method of the polymide dielectric heat-conductive composite material, includes the following steps:
(a) two ether diamine of 1,3,4- triphenyl of 6.5~7.5 parts by weight is mixed into 75~86 parts by weight under the conditions of ice-water bath
DMAC N,N' dimethyl acetamide；After being completely dissolved to 1,3,4- triphenyl, two ether diamine, then divide 10.6~12.3 weights of addition several times
Measure 4,4- (hexafluoro isopropyl) double phthalic anhydrides of part；It is all added to the double phthalic anhydrides of 4,4- (hexafluoro isopropyl)
And after dissolving, 1, the 3- diaminopropyl tetramethyl disiloxane of 0.29~0.34 parts by weight, mechanical stirring 30min is added；Add
The cubic boron nitride for entering 5~30 parts by weight continues 30~60min of stirring, and it is molten that in-situ polymerization obtains cubic boron nitride/polyamic acid
Liquid；
(b) cubic boron nitride/polyamic acid solution is subjected to electrostatic spinning, it is thermally conductive compound obtains cubic boron nitride/polyamic acid
Fibrofelt；
(c) cubic boron nitride/polyamic acid heat conduction composite fiber felt is removed to solvent 4h at 60 DEG C of vacuum；Then with 1 DEG C/min
Heating rate be heated to 120 DEG C of heat preservation 1h, 200 DEG C of heat preservation 1h are heated to the heating rate of 1 DEG C/min, with 1 DEG C/min's
Heating rate is heated to 250 DEG C of heat preservation 1h, carries out hot imidization；It is cooled to room temperature taking-up, cubic boron nitride/polyimides is obtained and leads
Hot composite fibrofelt；
(d) several layers cubic boron nitride/polyimides heat conduction composite fiber felt is pressed and molded, obtains cubic boron nitride/polyamides
Imines heat conduction composite fiber felt dielectric heat-conductive composite material；The temperature of the compression molding be 290~320 DEG C, pressure be 5~
10MPa, time are 10~15min.
2. polymide dielectric heat-conductive composite material according to claim 1, it is characterised in that: in the step (a),
4,4- (hexafluoro isopropyl) the double phthalic anhydrides added every time add the 4,4- of next batch after being completely dissolved (hexafluoro is different
Propyl) double phthalic anhydrides.
3. polymide dielectric heat-conductive composite material according to claim 1, it is characterised in that: in the step (a),
The weight of 4,4- (hexafluoro isopropyl) the double phthalic anhydrides added every time is no more than 0.2g.
4. polymide dielectric heat-conductive composite material according to claim 1, it is characterised in that: in the step (b),
Cubic boron nitride/polyamic acid solution is fitted into the injection needle equipped with metal needle, is then fixed injection needle level
On injection apparatus, the high voltage power supply positive electrode of electrostatic spinning machine is connected with metal needle, tinfoil paper collects paper bag and overlays on roller
On shape negative electrode, injection needle aligns with drum center, keeping the operating room of electrostatic spinning machine is sealing state, and keeps operating room
Temperature is 18~25 DEG C, and envionmental humidity is 50%~60%, and high-voltage power voltage is 15kV~25kV, and syringe needle is into roller
The distance of the heart is 15~20cm, and the revolving speed of roller is 40m/min.
5. polymide dielectric heat-conductive composite material according to claim 1, it is characterised in that: in the step (d),
Cubic boron nitride/polyimides heat conduction composite fiber felt 2g is weighed, the sample having a size of 20 × 20mm is cut into and is fitted into mold,
It is pressed and molded on tablet vulcanizer.
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| CN108239399A (en) * | 2018-01-29 | 2018-07-03 | 铜陵四通环境科技有限公司 | A kind of preparation method of high temperature resistant glass fibre reinforced plastic |
| CN108997754B (en) * | 2018-08-28 | 2021-01-19 | 武汉理工大学 | Polyimide high-temperature dielectric composite film and preparation method thereof |
| CN109487630B (en) * | 2018-11-15 | 2021-08-31 | 东华大学 | Nano boron nitride modified polyimide composite paper and preparation and application thereof |
| CN109880169B (en) * | 2019-01-08 | 2021-04-27 | 常州兴烯石墨烯科技有限公司 | In-situ polymerization modified white graphene nylon composite slice and preparation method thereof |
| CN110129994A (en) * | 2019-05-24 | 2019-08-16 | 东华大学 | Micro nanometer fiber film and preparation method thereof with efficient absorbent cooling function |
| CN114481355A (en) * | 2022-02-17 | 2022-05-13 | 苏州鸿凌达电子科技股份有限公司 | Method for preparing heat-conducting insulating film based on hexagonal boron nitride |
| CN114750491A (en) * | 2022-05-24 | 2022-07-15 | 陕西科技大学 | Polydopamine modified boron nitride nanosheet/polyimide heat-conducting and insulating composite film and preparation method and application thereof |
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