CN117304535A - Boron nitride nanosheet/aramid nanofiber composite film ball-milled by hydroxyethyl cellulose and preparation method - Google Patents
Boron nitride nanosheet/aramid nanofiber composite film ball-milled by hydroxyethyl cellulose and preparation method Download PDFInfo
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- 229910052582 BN Inorganic materials 0.000 title claims abstract description 64
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 title claims abstract description 61
- 239000004354 Hydroxyethyl cellulose Substances 0.000 title claims abstract description 59
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 title claims abstract description 59
- 229920003235 aromatic polyamide Polymers 0.000 title claims abstract description 48
- 239000002135 nanosheet Substances 0.000 title claims abstract description 45
- 239000002131 composite material Substances 0.000 title claims abstract description 44
- 239000002121 nanofiber Substances 0.000 title claims abstract description 36
- 239000004760 aramid Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims abstract description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000007900 aqueous suspension Substances 0.000 claims abstract description 37
- 239000008367 deionised water Substances 0.000 claims abstract description 32
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 32
- 239000006185 dispersion Substances 0.000 claims abstract description 18
- 239000007864 aqueous solution Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000000835 fiber Substances 0.000 claims abstract description 13
- 238000007731 hot pressing Methods 0.000 claims abstract description 13
- 238000003828 vacuum filtration Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000000498 ball milling Methods 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 3
- 239000002064 nanoplatelet Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 2
- 239000000945 filler Substances 0.000 abstract description 5
- 229920000307 polymer substrate Polymers 0.000 abstract description 3
- 238000000967 suction filtration Methods 0.000 abstract description 2
- 230000017525 heat dissipation Effects 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 238000007865 diluting Methods 0.000 description 5
- 239000011259 mixed solution Substances 0.000 description 5
- 239000006228 supernatant Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004100 electronic packaging Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino carboxylic acids or of polyamines and polycarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
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Abstract
The invention relates to a boron nitride nano-sheet/aramid nanofiber composite film ball-milled by hydroxyethyl cellulose and a preparation method thereof, wherein hexagonal boron nitride is ball-milled in an aqueous solution of the hydroxyethyl cellulose, and then the hydroxyethyl cellulose is removed by deionized water to obtain boron nitride nano-sheet/aqueous suspension; uniformly dispersing para-aramid fiber and KOH in dimethyl sulfoxide to obtain para-aramid nanofiber/dimethyl sulfoxide dispersion; homogenizing the boron nitride nano-sheet/water suspension, uniformly mixing the boron nitride nano-sheet/water suspension with para-aramid nano-fiber/dimethyl sulfoxide dispersion, and then sequentially carrying out vacuum filtration and hot pressing to obtain the boron nitride nano-sheet/aramid nano-fiber composite film ball-milled by hydroxyethyl cellulose. According to the invention, para-Aramid Nanofiber (ANF) is used as a polymer substrate, BNNS is used as a heat conducting filler, and excellent heat conducting performance is provided for the composite material through a vacuum suction filtration method and a hot pressing method.
Description
Technical Field
The invention relates to the field of fiber-based composite film preparation, in particular to a boron nitride nanosheet/aramid nanofiber composite film ball-milled by hydroxyethyl cellulose and a preparation method thereof.
Background
Heat dissipation is critical to the performance, lifetime, and reliability of electronic devices. With the rapid development of communication technology and electronic technology, the heat dissipation problem is more prominent in the fields of integrated electronic packaging, light emitting diodes, energy storage, aerospace and the like.
The current heat sinks are of a wide variety, but most heat sinks are in direct contact with the surface of the electronic component, directly absorbing heat and then discharging. Of course, for general electronic devices, the heat dissipation requirement of the electronic devices can be met by directly taking heat away through the heat sink. However, for large-scale precise instruments, the heat dissipation power of the large-scale precise instruments is far less than the heat dissipation requirement of the instruments. Thus, new highly thermally conductive materials are needed to help address this challenge. In this context, high performance Thermal Interface Materials (TIMs) are receiving a great deal of attention. However, it still has problems in terms of heat conductive properties, such as Thermal Conductivity (TC) being still low.
The selection of fillers and polymer matrices with higher intrinsic TC is an effective method for enhancing the thermal conductivity of TIM. Common inorganic thermally conductive fillers are divided into three types: metal materials, carbon-based materials, and ceramic materials. The metal material can improve the conductivity and density of the polymer composite material, reduce the chemical stability of the material, and is easy to corrode, thereby limiting the application of the metal material in the field of electric insulation. Carbon-based materials are difficult to disperse uniformly in a substrate and also have high conductivity, and thus may cause intermittent failure of electronic devices, limiting their range of application as fillers. However, the composite material prepared from the ceramic material can have both high thermal conductivity and electrical insulation properties. Boron nitride nano-sheets (BNNS) which are one of ceramic materials have high chemical stability, electrical insulation and chemical corrosion resistance, so that the thermal conductivity of TIMs can be improved by using the BNNS, but the inherent low TC of most polymers at present severely limits the wide application of the polymers in the fields requiring high TC value and rapid heat dissipation, so that the polymers cannot be compounded with the BNNS, and further the thermal conductivity of the TIMs is difficult to improve.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a boron nitride nano-sheet/aramid nano-fiber composite film ball-milled by hydroxyethyl cellulose and a preparation method thereof, wherein para-aramid nano-fiber (ANF) is taken as a polymer substrate, BNNS is taken as a heat conducting filler, and excellent heat conducting performance is provided for the composite material through a vacuum suction filtration method and a hot pressing method.
The invention is realized by the following technical scheme:
a preparation method of a hydroxyethyl cellulose ball-milled boron nitride nanosheet/aramid nanofiber composite film comprises the following steps:
s1, ball milling hexagonal boron nitride in a hydroxyethyl cellulose aqueous solution, wherein the mass ratio of the hexagonal boron nitride to the hydroxyethyl cellulose in the hydroxyethyl cellulose aqueous solution is (1-3): (0.3-0.5), and then removing hydroxyethyl cellulose by deionized water to obtain boron nitride nano-sheet/water suspension;
uniformly dispersing para-aramid fiber and KOH in dimethyl sulfoxide, wherein the mass ratio of the para-aramid fiber to the KOH is (300-500): (300-500) to obtain para-aramid nanofiber/dimethyl sulfoxide dispersion liquid;
s2, homogenizing the boron nitride nano-sheet/water suspension, uniformly mixing with para-aramid nano-fiber/dimethyl sulfoxide dispersion, and then sequentially carrying out vacuum filtration and hot pressing to obtain the boron nitride nano-sheet/aramid nano-fiber composite film ball-milled by hydroxyethyl cellulose.
Preferably, in the aqueous solution of hydroxyethyl cellulose described in S1, the ratio of hydroxyethyl cellulose to deionized water is (300 to 500) mg: (100-300) mL.
Preferably, the ratio of hexagonal boron nitride to the aqueous solution of hydroxyethyl cellulose in S1 is (1-3) g: (10-30 ml), and ball milling hexagonal boron nitride in the hydroxyethyl cellulose water solution for 12-24 h.
Preferably, S1 washes the suspension after ball milling with 30-50 mL deionized water for 3-5 times, and then dilutes the suspension with deionized water until the concentration of the boron nitride nano-sheets is 1-4 mg/mL, thus obtaining the boron nitride nano-sheet/water suspension.
Preferably, S1 stirs para-aramid fiber and KOH in dimethyl sulfoxide for 156-180 hours at a speed of 300-400 rpm to obtain para-aramid nanofiber/dimethyl sulfoxide dispersion.
Further, the ratio of KOH to dimethyl sulfoxide is (300-500) mg: (100-300) mL.
Preferably, the S2 homogenizes the boron nitride nano-sheet/water suspension for 120-180 min under the condition of 50-90 MPa.
Preferably, the vacuum filtration in S2 is carried out for 10-20 min under the condition of 0.06-0.09 MPa.
Preferably, the hot pressing in S2 is performed at 200-240℃for 10-15 min.
A hydroxyethylcellulose ball-milled boron nitride nano-sheet/aramid nanofiber composite film obtained by the preparation method of the hydroxyethylcellulose ball-milled boron nitride nano-sheet/aramid nanofiber composite film.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a preparation method of a hydroxyethyl cellulose ball-milled boron nitride nano sheet/aramid nanofiber composite film, which takes para-Aramid Nanofiber (ANF) as a polymer substrate and Boron Nitride Nano Sheet (BNNS) as a heat conducting filler, wherein the hydroxyethyl cellulose is adopted for assisting in ball milling hexagonal boron nitride, so as to prepare BNNS with large transverse size and small thickness and high aspect ratio, the intrinsic heat conductivity of BNNS can be greatly improved, and the intrinsic TC value of ANF is 1.07W m -1 K -1 Compared with other polymers, the interface density of the composite material is lower, the contact area of the interface is larger, the mean free path of phonons is longer, the phonon scattering is reduced,endowing the composite material with excellent heat conducting performance. The ANF and the BNNS are effectively compounded through a vacuum filtration and hot pressing method, the BNNS is oriented in the plane, and a continuous heat conduction network in the plane is constructed, so that the composite material has good heat conduction performance, and the field which can be applied to the high heat conduction requirement is met.
Drawings
FIG. 1a is an SEM image of BNNS obtained by stripping comparative example 1 with deionized water under 50 MPa.
FIG. 1b is an SEM image of the BNNS obtained by stripping under 50MPa in example 1 of the present invention.
FIG. 2 is a graph comparing the sizes of BNNS obtained in FIG. 1a and BNNS obtained in FIG. 1 b.
FIG. 3 shows the in-plane thermal conductivity of the BNNS/ANF composite film obtained by homogenization under different pressures.
FIG. 4 is a cross-sectional SEM image of a BNSS/ANF composite film obtained in example 1 of the present invention.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
The invention discloses a preparation method of a boron nitride nanosheet/aramid nanofiber composite film ball-milled by hydroxyethyl cellulose, which comprises the following specific steps:
(1) 300-500 mg of hydroxyethyl cellulose is weighed and dissolved in 100-300 mL of deionized water to obtain a hydroxyethyl cellulose aqueous solution with the concentration of 1-5 mg/mL.
(2) Taking 10-30 mL of the hydroxyethyl cellulose water solution prepared in the step (1), adding 1-3 g of hexagonal boron nitride (h-BN), ball milling for 12-24 h, washing for 3-5 times by using deionized water, namely adding 30-50 mL of deionized water each time, centrifuging, finally merging the supernatant, and diluting the concentration of the obtained boron nitride nano-sheet to 1-4 mg/mL by using the deionized water to obtain boron nitride nano-sheet (BNNS)/water suspension.
(3) Homogenizing the BNNS/water suspension prepared in the step (2) for 120-180 min under the condition of 50-90 MPa by using a micro-jet high-pressure homogenizer to obtain uniformly dispersed BNNS/water suspension for later use.
(4) 300-500 mg of para-aramid fiber and 300-500 mg of KOH are weighed, added into 100-300 mL of DMSO, and stirred for 156-180 h at a speed of 300-400 rpm to obtain a para-Aramid Nanofiber (ANF)/DMSO dispersion with a concentration of 1-5 mg/mL.
(5) Taking BNNS/water suspension prepared in the step (3), adding the BNNS/water suspension into the ANF/DMSO dispersion prepared in the step (4) to obtain a mixed solution, vacuum filtering for 10-20 min under the condition of 0.06-0.09 MPa, and hot-pressing for 10-15 min under the condition of 220-240 ℃ to finally obtain the BNNS/ANF composite film.
Example 1:
(1) 300mg of hydroxyethylcellulose was weighed and dissolved in 300mL of deionized water to obtain an aqueous solution of hydroxyethylcellulose having a concentration of 1 mg/mL.
(2) Taking 10mL of the hydroxyethyl cellulose water solution prepared in the step (1), adding 1g of hexagonal boron nitride (h-BN), ball milling for 12h, washing with deionized water for 5 times, namely adding 30mL of deionized water each time, centrifuging, finally merging supernatant, and diluting the concentration of the obtained boron nitride nanosheets to 1mg/mL by using the deionized water to obtain BNNS/water suspension.
(3) Homogenizing the BNNS/water suspension prepared in the step (2) for 120min under the condition of 50MPa by using a micro-jet high-pressure homogenizer to obtain uniformly dispersed BNNS/water suspension for later use.
(4) 300mg of para-aramid fiber and 300mg of KOH were weighed, added to 100mL of DMSO, and stirred at 400rpm for 168 hours to obtain AN AN F/DMSO dispersion having a concentration of 3 mg/mL.
(5) And (3) taking the BNNS/water suspension prepared in the step (3), adding the BNNS/water suspension into the AN F/DMSO dispersion prepared in the step (4) to obtain a mixed solution, carrying out vacuum filtration for 10min under the condition of 0.09MPa, and carrying out hot pressing for 10min under the condition of 220 ℃ to finally obtain the BNNS/ANF composite film.
As shown in FIG. 1b in combination with FIG. 1a, the suspension of step (2) was freeze-dried to give BNNS solid, designated 1% HEC, and 1g of hexagonal boron nitride (h-BN) was directly subjected to step (2) in 10ml of deionized water to give BNNS/water suspension, which was freeze-dried to give a solid, designated as DI, which was designated as comparative example 1. It can be seen that hydroxyethyl cellulose-assisted ball milling of boron nitride nanoplatelets has a larger lateral dimension and a thinner thickness.
From FIG. 2, it can be seen that the BNNS lateral dimension from HEC aqueous stripping is greater than 5.583 μm, while the BNNS lateral dimension from deionized water stripping is 1.879. Mu.m, see in particular the following table.
As can be seen from fig. 4, the interface bonding degree between BNNS and ANF is relatively good, the in-plane orientation degree of BNNS is high, and the interface contact area is large, so that the interface density is low, phonon scattering is reduced, and the composite material has excellent heat conduction performance.
Example 2
(1) 300mg of hydroxyethylcellulose was weighed and dissolved in 300mL of deionized water to obtain an aqueous solution of hydroxyethylcellulose having a concentration of 1 mg/mL.
(2) Taking 10mL of the hydroxyethyl cellulose water solution prepared in the step (1), adding 1g of hexagonal boron nitride (h-BN), ball milling for 12h, washing with deionized water for 5 times, namely adding 30mL of deionized water each time, centrifuging, finally merging supernatant, and diluting the concentration of the obtained boron nitride nanosheets to 1mg/mL by using the deionized water to obtain BNNS/water suspension.
(3) Homogenizing the BNNS/water suspension prepared in the step (2) for 120min under the condition of 60MPa by using a micro-jet high-pressure homogenizer to obtain uniformly dispersed BNNS/water suspension for later use.
(4) 300mg of para-aramid fiber and 300mg of KOH were weighed, added to 100mL of DMSO, and stirred at 400rpm for 168 hours to obtain AN AN F/DMSO dispersion having a concentration of 3 mg/mL.
(5) And (3) taking the BNNS/water suspension prepared in the step (3), adding the BNNS/water suspension into the ANF/DMSO dispersion prepared in the step (4) to obtain a mixed solution, carrying out vacuum filtration for 10min under the condition of 0.09MPa, and carrying out hot pressing for 10min under the condition of 220 ℃ to finally obtain the BNNS/ANF composite film.
Example 3
(1) 300mg of hydroxyethylcellulose was weighed and dissolved in 300mL of deionized water to obtain an aqueous solution of hydroxyethylcellulose having a concentration of 1 mg/mL.
(2) Taking 10mL of the hydroxyethyl cellulose water solution prepared in the step (1), adding 1g of hexagonal boron nitride (h-BN), ball milling for 12h, washing with deionized water for 5 times, namely adding 30mL of deionized water each time, centrifuging, finally merging supernatant, and diluting the concentration of the obtained boron nitride nanosheets to 1mg/mL by using the deionized water to obtain BNNS/water suspension.
(3) Homogenizing the BNNS/water suspension prepared in the step (2) for 120min under the condition of 75MPa by using a micro-jet high-pressure homogenizer to obtain uniformly dispersed BNNS/water suspension for later use.
(4) 300mg of para-aramid fiber and 300mg of KOH were weighed, added to 100mL of DMSO, and stirred at 400rpm for 168 hours to obtain AN AN F/DMSO dispersion having a concentration of 3 mg/mL.
(5) And (3) taking the BNNS/water suspension prepared in the step (3), adding the BNNS/water suspension into the ANF/DMSO dispersion prepared in the step (4) to obtain a mixed solution, carrying out vacuum filtration for 10min under the condition of 0.09MPa, and carrying out hot pressing for 10min under the condition of 220 ℃ to finally obtain the BNNS/ANF composite film.
Example 4
(1) 300mg of hydroxyethylcellulose was weighed and dissolved in 300mL of deionized water to obtain an aqueous solution of hydroxyethylcellulose having a concentration of 1 mg/mL.
(2) Taking 10mL of the hydroxyethyl cellulose water solution prepared in the step (1), adding 1g of hexagonal boron nitride (h-BN), ball milling for 12h, washing with deionized water for 5 times, namely adding 30mL of deionized water each time, centrifuging, finally merging supernatant, and diluting the concentration of the obtained boron nitride nanosheets to 1mg/mL by using the deionized water to obtain BNNS/water suspension.
(3) Homogenizing the BNNS/water suspension prepared in the step (2) for 120min under the condition of 90MPa by using a micro-jet high-pressure homogenizer to obtain uniformly dispersed BNNS/water suspension for later use.
(4) 300mg of para-aramid fiber and 300mg of KOH were weighed, added to 100mL of DMSO, and stirred at 400rpm for 168 hours to obtain an ANF/DMSO dispersion having a concentration of 3 mg/mL.
(5) And (3) taking the BNNS/water suspension prepared in the step (3), adding the BNNS/water suspension into the ANF/DMSO dispersion prepared in the step (4) to obtain a mixed solution, carrying out vacuum filtration for 10min under the condition of 0.09MPa, and carrying out hot pressing for 10min under the condition of 220 ℃ to finally obtain the BNNS/ANF composite film.
As shown in FIG. 3, the thermal conductivities of the composite films with different BNNS loading amounts are shown in the horizontal axis as the homogenizing pressure, the vertical axis as the in-plane thermal conductivity of the composite film, namely the in-plane thermal conductivity of the composite film and the boron nitride nano-sheets obtained by homogenizing under the conditions of 50, 75 and 90MPa is shown, the highest thermal conductivities of the composite film and the boron nitride nano-sheets obtained by homogenizing under the condition of 75MPa are shown as 31.5W m -1 K -1 。
Claims (10)
1. The preparation method of the hydroxyethyl cellulose ball-milled boron nitride nanosheet/aramid nanofiber composite film is characterized by comprising the following steps of:
s1, ball milling hexagonal boron nitride in a hydroxyethyl cellulose aqueous solution, wherein the mass ratio of the hexagonal boron nitride to the hydroxyethyl cellulose in the hydroxyethyl cellulose aqueous solution is (1-3): (0.3-0.5), and then removing hydroxyethyl cellulose by deionized water to obtain boron nitride nano-sheet/water suspension;
uniformly dispersing para-aramid fiber and KOH in dimethyl sulfoxide, wherein the mass ratio of the para-aramid fiber to the KOH is (300-500): (300-500) to obtain para-aramid nanofiber/dimethyl sulfoxide dispersion liquid;
s2, homogenizing the boron nitride nano-sheet/water suspension, uniformly mixing with para-aramid nano-fiber/dimethyl sulfoxide dispersion, and then sequentially carrying out vacuum filtration and hot pressing to obtain the boron nitride nano-sheet/aramid nano-fiber composite film ball-milled by hydroxyethyl cellulose.
2. The method for preparing the hydroxyethyl cellulose ball-milled boron nitride nano-sheet/aramid nano-fiber composite film according to claim 1, wherein in the hydroxyethyl cellulose aqueous solution in S1, the proportion of hydroxyethyl cellulose to deionized water is (300-500) mg: (100-300) mL.
3. The method for preparing the hydroxyethyl cellulose ball-milled boron nitride nano-sheet/aramid nanofiber composite film according to claim 1, wherein the ratio of hexagonal boron nitride to hydroxyethyl cellulose aqueous solution in S1 is (1-3) g: (10-30 ml), and ball milling hexagonal boron nitride in the hydroxyethyl cellulose water solution for 12-24 h.
4. The preparation method of the hydroxyethyl cellulose ball-milled boron nitride nano-sheet/aramid nanofiber composite film is characterized in that S1 washes the ball-milled suspension with 30-50 mL of deionized water for 3-5 times, and then dilutes the suspension with deionized water until the concentration of the boron nitride nano-sheet is 1-4 mg/mL to obtain the boron nitride nano-sheet/water suspension.
5. The method for preparing the hydroxyethyl cellulose ball-milled boron nitride nano-sheet/aramid nano-fiber composite film according to claim 1, wherein S1 is used for stirring para-aramid fiber and KOH in dimethyl sulfoxide for 156-180 hours at a speed of 300-400 rpm to obtain para-aramid nano-fiber/dimethyl sulfoxide dispersion liquid.
6. The method for preparing the hydroxyethyl cellulose ball-milled boron nitride nano-sheet/aramid nano-fiber composite film according to claim 5, wherein the ratio of KOH to dimethyl sulfoxide is (300-500) mg: (100-300) mL.
7. The method for preparing the hydroxyethyl cellulose ball-milled boron nitride nano-sheet/aramid nanofiber composite film according to claim 1, wherein the step S2 is to homogenize the boron nitride nano-sheet/water suspension for 120-180 min under the condition of 50-90 MPa.
8. The method for preparing the hydroxyethyl cellulose ball-milled boron nitride nanosheet/aramid nanofiber composite film according to claim 1, wherein the vacuum filtration in the step S2 is performed for 10-20 min under the condition of 0.06-0.09 MPa.
9. The method for preparing the hydroxyethyl cellulose ball-milled boron nitride nanosheet/aramid nanofiber composite film according to claim 1, wherein the hot pressing in the step S2 is performed at 200-240 ℃ for 10-15 min.
10. A hydroxyethylcellulose ball-milled boron nitride nanoplatelet/aramid nanofiber composite film obtained by the method for preparing a hydroxyethylcellulose ball-milled boron nitride nanoplatelet/aramid nanofiber composite film according to any one of claims 1 to 9.
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| CN118185448A (en) * | 2024-05-17 | 2024-06-14 | 淄博金锐纳米材料科技有限公司 | High-performance coating for sand paper and preparation method thereof |
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