CN107840979B - A kind of preparation method of crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane - Google Patents
A kind of preparation method of crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane Download PDFInfo
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Abstract
The invention discloses a kind of preparation methods of crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane.The nano-cellulose that the composite membrane by diameter is 2~20nm, length is 100nm~5 μm and the hexagonal boron nitride nanosheet with superior dielectric performance are compound, then are made after multi-valent metal salt solution impregnates.Composite membrane provided by the invention has lower dielectric loss, and higher breakdown strength, energy storage density and energy storage efficiency, in addition, composite membrane also has good layer structure, and crosslinked rear thermal stability is improved there has also been significant.The composite membrane will have wide and great potential application prospect in terms of dielectric stored energy application.
Description
Technical field
The invention belongs to technical field of composite materials, and in particular to a kind of crosslinking nano cellulose/hexagonal nanometer boron nitride
The preparation method of piece composite membrane.
Background technique
Cellulose is reserves natural polymer the most abundant in nature, this is provided extensively for the acquisition of nano-cellulose
General source also makes nano-cellulose have advantage low in cost and big yield；In addition, nano-cellulose film it is flexible,
Light transmittance is high, compactness is good, is the ideal material as energy storage material substrate.Currently, the raw material of nano-cellulose preparation is to plant
Based on object, and native cellulose is wrapped in plant cell wall in higher plant, has complicated connection function with cell wall,
This will lead to removing cellulose it is more difficult, by the research of numerous researchers, it has been found that nano-cellulose preparation it is more
Kind method, these methods mainly have physical method, chemical method and bioanalysis, but by mechanical phonograph recorder separation (physical method) or strong acid hydrolysis method
The disadvantages of nano-cellulose that the methods of (chemical method) obtains, shorter, thickness that there are fibre lengths is unevenly distributed.
Hexagonal boron nitride has the layer structure similar to graphite, therefore its stratiform that can be used for preparing high structural regularity
Polymer composites.In addition, the chemical stability of hexagonal boron nitride is good, itself breakdown strength is high, reachable 700kV/mm,
Therefore hexagonal boron nitride nanosheet is added into basis material the breakdown strength that can increase substantially matrix as filler.By nanometer
Cellulose and hexagonal boron nitride nanosheet is compound the advantages of both capable of integrating, it is good to obtain layer structure, dielectric properties it is good with
The composite film material of excellent heat stability.
But the defect of structure can be introduced by being usually added into inorganic filler at present, so that compound lamellar spacing is larger.
Summary of the invention
It is an object of that present invention to provide a kind of layer structure is good, dielectric properties are good and the crosslinking nano of excellent heat stability
Cellulose/hexagonal boron nitride nanosheet composite membrane and preparation method thereof.
In order to achieve the above objectives, as follows using technical solution:
A kind of preparation method of crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane, comprising the following steps:
1) nano-cellulose (TOCN) dispersion liquid is prepared:
TEMPO and NaBr is added in deionized water, stirs to being completely dissolved, native cellulose, NaClO is then added,
It is 9~11 with NaOH solution regulation system pH value, is filtered, washed, is dried to obtain after 0.5~7h of oxidation reaction at 10~30 DEG C
Nano-cellulose surveys its water content；It is added it in distilled water again and is dispersed to obtain nano-cellulose dispersion liquid, i.e. TOCN
Dispersion liquid；
2) hexagonal boron nitride nanosheet powder (BNNS) is prepared:
Hexagonal boron nitride raw material powder is mixed with triethanolamine, takes supernatant after agitated, centrifugation, six sides nitridation is made
The dispersion liquid of boron；Deionized water is added in dispersion liquid again to be sufficiently mixed, filtered, washed；The product obtained after washing is again
It is scattered in deionized water, is installed to be placed in liquid nitrogen with centrifuge tube and be rapidly frozen, finally put the centrifuge tube freezed
Enter freeze drying box, is freeze-dried to powdered；
3) nano-cellulose/hexagonal boron nitride nanosheet (TOCN/BNNS) composite membrane is prepared:
Gained nano-cellulose dispersion liquid is mixed with gained hexagonal boron nitride nanosheet powder, then by mixed dispersion liquid
It is stirred, ultrasound, through casting film-forming and dries obtained nano-cellulose/hexagonal boron nitride nanosheet composite membrane；
4) crosslinking nano cellulose/hexagonal boron nitride nanosheet (CLTOCN/BNNS) composite membrane) is prepared:
Polyvalent metal salt powder is add to deionized water, multi-valent metal salt solution is made to being uniformly mixed in stirring；Again
Step 3 gained nano-cellulose/hexagonal boron nitride nanosheet laminated film is put into the multi-valent metal salt solution and impregnates 0.1
~10h is dried and crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane is made after water washing.
According to the above scheme, TEMPO, NaBr, native cellulose, NaClO are 1:(1~10 in mass ratio in step 1): (10-
100):(10-100)。
According to the above scheme, in step 2 hexagonal boron nitride raw material powder and triethanolamine be in mass ratio 1:(100~
1000)。
According to the above scheme, in step 3 mixed system press volume percent nano-cellulose dispersion liquid 80%~99%, six
Square boron nitride nanosheet powder is 1%~20%.
According to the above scheme, native cellulose described in step 1 be cotton cellulose, wood pulp, flaxen fiber, bagasse, cocoanut shell,
One of celluloses such as shuck, wheat straw, rice bar, bacteria cellulose or ascidian cellulose are a variety of.
According to the above scheme, the dispersing mode in step 1 is mechanical stirring, ultrasound or high pressure water process.
According to the above scheme, nano-cellulose dispersion liquid concentration described in step 3 is 0.1~1% (mass concentration)；The nanometer
Cellulose diameter is in 2~20nm, length in 100nm~5 μm.
According to the above scheme, the concentration of multi-valent metal salt solution described in step 4 is 0.1~1mol/L.
According to the above scheme, drying temperature is 30~60 DEG C in step 3 and step 4.
According to the above scheme, the structure of multivalent metal salt is M in step 42+(A-)2Or M3+(A-)3, M in formula2+For Mg2+、Zn2+、
Cu2+Or Ca2+；M3+For Al3+、Cr3+Or Fe3+；A-For C1-Or NO3 -。
TEMPO method prepares nano-cellulose and can effectively, selectively be catalyzed the primary hydroxyl group on the position cellulose C6
It is oxidized to carboxyl.Under alkaline environment, the negative potential on nano-cellulose surface is enhanced, so that producing between nano-cellulose
Phase repulsive interaction divides nano-cellulose from native cellulose to weaken the interaction between nano-cellulose
It separates out and；Multi-valent metal salt solution infusion method handles TOCN/BNNS composite membrane, is by the Na on the TOCN-COONa in TOCN film+Replaced with multivalent metal cation, multivalent metal cation can simultaneously with multiple-COO-It interacts and forms ionomer.
The present invention selects TEMPO method to prepare nano-cellulose, and method is convenient and obtained nano-cellulose diameter is small and equal
Even, this nano-cellulose and other polymers compound tense can play humidification；Selecting itself has preferable dielectric properties
BNNS is added in nano-cellulose as filler, but is formed by TOCN/BNNS composite membrane with fault of construction, dielectric properties
It is affected；Again by being crosslinked (multi-valent metal salt solution infusion method) processing to TOCN/BNNS composite membrane, then can be reduced thin
Gap in membrane material increases its consistency, therefore the CLTOCN/BNNS composite membrane dielectric loss prepared is lower, have compared with
High breakdown strength, energy storage density and energy storage efficiency additionally has good thermal stability.
The beneficial effects of the present invention are:
1, the present invention preferably nano-cellulose of the TEMPO oxidative treatment with special diameter and length with pass through it is specific
The hexagonal boron nitride nanosheet that removing means obtain is compound, then through CaCl2Equal multi-valent metal salt solutions impregnate, so that gained is compound
Thin film laminated structures void is reduced, and consistency increases；The CLTOCN/BNNS composite membrane for the different volumes ratio prepared have compared with
Low dielectric loss, higher breakdown strength, energy storage density and energy storage efficiency；The composite membrane will have in terms of dielectric stored energy application
There is wide and great potential application prospect；
2, the present invention uses triethanolamine to prepare few layer hexagonal boron nitride nanosheet as stripping solution, easy to operate, mildly
Stir process, and hexagonal boron nitride obtained/triethanolamine dispersion stability is good, holding nine months or more precipitation capacities
It is less；
3, it is physical process that the present invention, which mixes TOCN dispersion liquid with BNNS, is not chemically reacted, and simple process,
It is easy to operate, no pollution to the environment；This treatment process of TOCN/BNNS composite membrane is impregnated using multi-valent metal salt solution, not only
It is simple and convenient and low in cost；Entire technique is not high to equipment requirement, is conducive to industrialized production.
Detailed description of the invention
Attached drawing 1: the SEM cross-section diagram of pure TOCN film prepared by comparative example 1 of the present invention.
Attached drawing 2: nano-cellulose prepared by comparative example 2 of the present invention/hexagonal boron nitride nanosheet composite membrane (TB04)
SEM cross-section diagram.
Attached drawing 3: the cellulose of crosslinking nano prepared by the embodiment of the present invention 1/hexagonal boron nitride nanosheet composite membrane
(CLTB04) SEM cross-section diagram.
Specific embodiment
Following embodiment further illustrates technical solution of the present invention, but not as limiting the scope of the invention.
Comparative example 1
Pure nano-cellulose film (pure TOCN film) is prepared, steps are as follows:
Preparation TOCN dispersion liquid: taking 0.01g TEMPO, 0.1g NaBr, it is added in 1000mL deionized water jointly,
Magnetic agitation 10min, which is mixed them thoroughly, at 300r/min is uniformly completely dissolved to TEMPO and NaBr, then into above-mentioned system
The cotton linter of 1g is added, 0.1gNaClO is then added into system, the NaOH solution by the way that 0.1mol/L is added dropwise keeps system pH
Value is 9, is filtered the cellulose after oxidation after reacting 5h, then be washed with deionized 3 times or more, is dried to obtain TEMPO
Oxycellulose；It puts it into beaker again, deionized water is added and is dispersed, then mechanical stirring 6min and ultrasonic treatment
12min obtains the nano-cellulose dispersion liquid that concentration is 0.3%, i.e. 0.3%TOCN dispersion liquid；
It makes pure TOCN film: 0.3%TOCN dispersion liquid being first subjected to casting film-forming, and is dried to obtain concentration at 40 DEG C and is
0.3% pure TOCN film.
Pattern test, test knot are carried out to obtained TOCN dispersion liquid using DI Nanoscope IV atomic force microscope
Fruit shows that the TOCN diameter that this comparative example obtains is 3~4nm, and average length is 3 μm；Utilize HIOKI3532-50LCR dielectric frequency
Dielectric constant, dielectric loss and the breakdown for the pure TOCN film that spectrometer and DDJ-50kV voltage breakdown experiment apparatus prepare this comparative example
Intensity is tested, and test result shows dielectric constant of the pure TOCN film of this comparative example preparation under 1kHz frequency 10.8
Left and right, for dielectric loss 0.07 or so, breakdown strength is only 51.6kV/mm.Using STA449C thermogravimetric analyzer to thermal stability
It can be carried out test, test result shows that temperature corresponding to pure TOCN film decomposition mechanism is 240.2 DEG C.
It is as shown in Figure 1 the SEM cross-section diagram of the pure TOCN film of this comparative example preparation, pure TOCN film internal structure as can be seen
In layer structure, and more uniformly, closely, there is only few gaps between cellulose for structure.
Comparative example 2
Nano-cellulose/hexagonal boron nitride nanosheet composite membrane is prepared, steps are as follows:
1) TOCN dispersion liquid processed: taking 0.01g TEMPO, 0.1g NaBr, it is added in 1000mL deionized water jointly,
Magnetic agitation 10min, which is mixed them thoroughly, at 300r/min is uniformly completely dissolved to TEMPO and NaBr, then into above-mentioned system
The cotton linter of 1g is added, 0.1gNaClO is then added into system, the NaOH solution by the way that 0.1mol/L is added dropwise keeps system pH
Value is 9, is filtered the cellulose after oxidation after reacting 5h, then be washed with deionized 3 times or more, is dried to obtain TEMPO
Oxycellulose；It puts it into beaker again, deionized water is added and is dispersed, then mechanical stirring 6min and ultrasonic treatment
12min obtains the nano-cellulose dispersion liquid that concentration is 0.3%, i.e. 0.3%TOCN dispersion liquid；
2) BNNS processed: 30ml triethanolamine will be added in 0.3g hexagonal boron nitride raw material powder, taken after agitated, centrifugation
The dispersion liquid of hexagonal boron nitride is made in clear liquid；400ml deionized water will be added in dispersion liquid again to be sufficiently mixed, carries out four pumpings
Filter, washing；The product obtained after washing is redispersed in the water of 100ml, installed with centrifuge tube be placed in liquid nitrogen carry out quickly
The centrifuge tube freezed is finally put into freeze drying box by freezing, is freeze-dried to powdered.
3) TOCN/BNNS composite membrane processed: by the TOCN dispersion liquid of above-mentioned preparation and BNNS with volume ratio 98:2,96:4,92:
8 and 88:12 is blended and (is denoted as TB02, TB04, TB08 and TB12), and mixed dispersion liquid magneton is then stirred 30min, ultrasound
4min, after mixing casting film-forming and at 40 DEG C dry be made TOCN/BNNS composite membrane；Wherein, it is total to account for composite membrane by BNNS
2%, 4%, 8% and the 12% of volume.
Utilize the dielectric constant and dielectric damage of the composite membrane that HIOKI3532-50LCR dielectric and magnetic instrument prepares this comparative example
Consumption is tested, and the TB02 composite membrane dielectric constant that the preparation of this comparative example is measured under 1KHz frequency is 11.4, and dielectric loss is
0.08, TB04 composite membrane dielectric constant is 9.14, dielectric loss 0.1, and TB08 composite membrane dielectric constant is 9.62, dielectric loss
It is 11.07 for 0.13, TB12 composite membrane dielectric constant, dielectric loss 0.18 can obtain composite membrane and the pure TOCN film of comparative example 1
It is significantly increased compared to dielectric loss.
It is illustrated in figure 2 the SEM cross-section diagram of the TB04 composite membrane of this comparative example preparation, composite membrane as can be seen keeps comparison
The layer structure of pure TOCN film in example 1, but there is a certain amount of gap, structure is defective.
Embodiment 1
Crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane is prepared, steps are as follows:
1) TOCN dispersion liquid processed: taking 0.01gTEMPO, 0.1gNaBr, it is added in 1000mL deionized water jointly, In
10 DEG C, magnetic agitation 10min is mixed them thoroughly and is uniformly completely dissolved to TEMPO and NaBr under 300r/min, then to above-mentioned body
The cotton linter of 1g is added in system, 0.1g NaClO is then added into system, the NaOH solution by the way that 0.1mol/L is added dropwise is kept
System pH is 9, is filtered the cellulose after oxidation after reacting 5h at 10 DEG C, then be washed with deionized 3 times or more,
It is dried to obtain TEMPO oxycellulose；It puts it into beaker again, deionized water is added and is dispersed, then mechanical stirring
6min and ultrasonic treatment 12min, obtains the nano-cellulose dispersion liquid that concentration is 0.3%, i.e. 0.3%TOCN dispersion liquid；
2) BNNS: processed: 30ml triethanolamine will be added in 0.3g hexagonal boron nitride raw material powder, taken after agitated, centrifugation
The dispersion liquid of hexagonal boron nitride is made in supernatant；400ml deionized water will be added in dispersion liquid again to be sufficiently mixed, carry out four times
It filters, washing；The product obtained after washing is redispersed in the water of 100ml, installed with centrifuge tube be placed in liquid nitrogen carry out it is fast
Quickly cooling is frozen, and the centrifuge tube freezed is finally put into freeze drying box, is freeze-dried to powdered.
3) TOCN/BNNS composite membrane processed: the TOCN dispersion liquid of above-mentioned preparation is blended with BNNS with volume ratio 96:4
Then mixed dispersion liquid magneton is stirred 30min, ultrasound 4min, after mixing casting film-forming and at 40 DEG C by (being denoted as TB04)
TOCN/BNNS composite membrane is made in lower dry；
4) CLTOCN/BNNS composite membrane processed: by 11.1g CaCl2Powder is added in 1000ml deionized water, and stirring is extremely
It is uniformly mixed, the CaCl of 0.1mol/L is made2Salting liquid；TB04 laminated film is put into the above-mentioned CaCl of 150ml again2In salting liquid
2h is impregnated, more than three times through water washing, CLTOCN/BNNS composite membrane (being denoted as CLTB04) is made after drying at 40 DEG C.Wherein,
BNNS accounts for the 4% of composite membrane total volume.
Using HIOKI3532-50LCR dielectric and magnetic instrument and DDJ-50KV voltage breakdown experiment apparatus to manufactured in the present embodiment
The dielectric properties of CLTB04 composite membrane are tested, and the dielectric loss for measuring composite membrane under 1KHz frequency is 0.025, breakdown
Intensity is 384.2kV/mm, can show that CLTB04 film dielectric loss compared with the pure TOCN film of comparative example 1 reduces 64.3%, breakdown
Intensity improves 86.6%, and dielectric loss reduces 75% compared with the TB04 film of comparative example 2；Known breakdown strength, according still further to
Formula Umax=1/2 ε ε0CLTB04 is calculated in 380MVm in E2b-1Electric field in maximum energy storage density be up to 3.90J
cm-3, it is energy storage density (0.81Jcm more highest than the boiomacromolecule compound once reported-3) high, also compare
Industrial common best dielectric macromolecule BOPP (2Jcm-3) high；Furthermore CLTB04 composite membrane is in 50~300MVm-1
Electric field under, the energy storage efficiency of film is 86% or more.Test can be carried out to thermal stability using STA449C thermogravimetric analyzer, survey
Composite membrane is obtained compared with pure TOCN film prepared by comparative example 1, temperature corresponding to decomposition mechanism increases to 340 from 240 DEG C
DEG C (improving 100 DEG C).
It is illustrated in figure 3 the SEM cross-section diagram of CLTB04 composite membrane manufactured in the present embodiment, six sides nitrogenize as can be seen from Figure
Boron can be well dispersed between nano-cellulose layer structure, keep the layer structure of pure TOCN film in comparative example 1, and opposite
TB04 composite membrane layer structure is even closer in comparative example 2, and more obvious, interlayer spacings also significantly reduce.
Embodiment 2
Crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane is prepared, steps are as follows:
1) TOCN dispersion liquid processed: taking 0.01gTEMPO, 0.01gNaBr, it is added in 100mL deionized water jointly, In
30 DEG C, magnetic agitation 20min is mixed them thoroughly and is uniformly completely dissolved to TEMPO and NaBr under 600r/min, then to above-mentioned body
The softwood bleached pulp of 0.1g is added in system, 1gNaClO is then added into system, by the NaOH solution that 0.5mol/L is added dropwise
Keeping system pH is 11, is filtered the cellulose after oxidation after reacting 7h at 30 DEG C, then be washed with deionized 3 times
More than, it is dried to obtain TEMPO oxycellulose；It puts it into beaker again, deionized water is added and is dispersed, then machinery stirs
6min and ultrasonic treatment 6min are mixed, the nano-cellulose dispersion liquid that concentration is 0.5%, i.e. 0.5%TOCN dispersion liquid are obtained；
2) BNNS processed: 30ml triethanolamine will be added in 0.3g hexagonal boron nitride raw material powder, taken after agitated, centrifugation
The dispersion liquid of hexagonal boron nitride is made in clear liquid；400ml deionized water will be added in dispersion liquid again to be sufficiently mixed, carries out four pumpings
Filter, washing；The product obtained after washing is redispersed in the water of 100ml, installed with centrifuge tube be placed in liquid nitrogen carry out quickly
The centrifuge tube freezed is finally put into freeze drying box by freezing, is freeze-dried to powdered.
3) TOCN/BNNS composite membrane processed: the TOCN dispersion liquid of above-mentioned preparation is blended with BNNS with volume ratio 98:2
It is blended and (is denoted as TB02), mixed dispersion liquid magneton is then stirred into 30min, ultrasound 4min, after mixing casting film-forming
And it is dried at 40 DEG C and TOCN/BNNS composite membrane is made；
4) CLTOCN/BNNS composite membrane processed: by 11.1g CaCl2Powder is added in 1000ml deionized water, and stirring is extremely
It is uniformly mixed, the CaCl of 0.1mol/L is made2Salting liquid；TB02 laminated film is put into the above-mentioned CaCl of 150ml again2In salting liquid
2h is impregnated, more than three times through water washing, CLTOCN/BNNS composite membrane (being denoted as CLTB02) is made after drying at 40 DEG C.Wherein,
BNNS accounts for the 2% of composite membrane total volume.
Composite membrane manufactured in the present embodiment is tested using method same as Example 1, is surveyed under 1KHz frequency
The dielectric loss for obtaining composite membrane is 0.03, breakdown strength 352.5kV/mm, can obtain CLTB02 film and the pure TOCN film of comparative example 1
57.1% is reduced compared to dielectric loss, breakdown strength improves 85.4%, and dielectric loss drops compared with the TB02 film of comparative example 2
Low 62.5%；By the way that CLTB02 is calculated in 350MVm-1Electric field in maximum energy storage density be up to 3.40Jcm-3；
Furthermore CLTB02 composite membrane is in 50~300MVm-1Electric field under, the energy storage efficiency of film is 90% or more.The maximum of composite membrane point
Temperature corresponding to rate is solved 340 DEG C or so (improving 100 DEG C than pure TOCN film).
Embodiment 3
Crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane is prepared, steps are as follows:
1) TOCN dispersion liquid processed: taking 0.02gTEMPO, 0.05gNaBr, it is added in 1000mL deionized water jointly, In
15 DEG C, magnetic agitation 15min is mixed them thoroughly and is uniformly completely dissolved to TEMPO and NaBr under 400r/min, then to above-mentioned body
The bacteria cellulose of 1g is added in system, 1.5gNaClO is then added into system, the NaOH solution by the way that 0.2mol/L is added dropwise is protected
Hold system pH be 10, at 15 DEG C react 6h after the cellulose after oxidation is filtered, then be washed with deionized 3 times with
On, it is dried to obtain TEMPO oxycellulose；It puts it into beaker again, deionized water is added and is dispersed, then mechanical stirring
6min and ultrasonic treatment 12min, obtains the nano-cellulose dispersion liquid that concentration is 0.2%, i.e. 0.2%TOCN dispersion liquid；
2) BNNS processed: 35ml triethanolamine will be added in 0.3g hexagonal boron nitride raw material powder, taken after agitated, centrifugation
The dispersion liquid of hexagonal boron nitride is made in clear liquid；400ml deionized water will be added in dispersion liquid again to be sufficiently mixed, carries out four pumpings
Filter, washing；The product obtained after washing is redispersed in the water of 100ml, installed with centrifuge tube be placed in liquid nitrogen carry out quickly
The centrifuge tube freezed is finally put into freeze drying box by freezing, is freeze-dried to powdered.
3) TOCN/BNNS composite membrane processed: the TOCN dispersion liquid of above-mentioned preparation is blended with BNNS with volume ratio 92:8
Then mixed dispersion liquid magneton is stirred 30min, ultrasound 4min, after mixing casting film-forming and at 35 DEG C by (being denoted as TB08)
TOCN/BNNS composite membrane is made in lower dry；
4) CLTOCN/BNNS composite membrane processed: by 22.2g CaCl2Powder is added in 1000ml deionized water, and stirring is extremely
It is uniformly mixed, the CaCl of 0.2mol/L is made2Salting liquid；TB08 laminated film is put into the above-mentioned CaCl of 150ml again2In salting liquid
3h is impregnated, more than three times through water washing, CLTOCN/BNNS composite membrane (being denoted as CLTB08) is made after drying at 35 DEG C.Wherein,
BNNS accounts for the 8% of composite membrane total volume.
Composite membrane manufactured in the present embodiment is tested using method same as Example 1, is surveyed under 1KHz frequency
The dielectric loss for obtaining composite membrane is 0.027, breakdown strength 368.9KV/mm, can obtain CLTB08 film and the pure TOCN of comparative example 1
Film reduces 61.4% compared to dielectric loss, and breakdown strength improves 86%, and dielectric loss drops compared with the TB08 film of comparative example 2
Low 79.2%；By the way that CLTB08 is calculated in 370MVm-1Electric field in maximum energy storage density be up to 3.06Jcm-3；
Furthermore CLTB08 composite membrane is in 50~300MVm-1Electric field under, the efficiency for charge-discharge of film is 85% or more.
Embodiment 4
Crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane is prepared, steps are as follows:
1) TOCN dispersion liquid processed: taking 0.01g TEMPO, 0.06g NaBr, it is added in 100mL deionized water jointly,
Magnetic agitation 17min, which is mixed them thoroughly, at 25 DEG C, 450r/min is uniformly completely dissolved to TEMPO and NaBr, then Xiang Shangshu
The ascidian cellulose of 0.1g is added in system, 0.6gNaClO is then added into system, it is molten by the NaOH that 0.3mol/L is added dropwise
It is 10 that liquid, which keeps system pH, is filtered the cellulose after oxidation after reacting 7h at 25 DEG C, then be washed with deionized 3
More than secondary, it is dried to obtain TEMPO oxycellulose；It puts it into beaker again, deionized water is added and is dispersed, it is then mechanical
6min and ultrasonic treatment 12min are stirred, the nano-cellulose dispersion liquid that concentration is 0.1%, i.e. 0.1%TOCN dispersion liquid are obtained；
2) BNNS processed: 35ml triethanolamine will be added in 0.3g hexagonal boron nitride raw material powder, taken after agitated, centrifugation
The dispersion liquid of hexagonal boron nitride is made in clear liquid；400ml deionized water will be added in dispersion liquid again to be sufficiently mixed, carries out four pumpings
Filter, washing；The product obtained after washing is redispersed in the water of 100ml, installed with centrifuge tube be placed in liquid nitrogen carry out quickly
The centrifuge tube freezed is finally put into freeze drying box by freezing, is freeze-dried to powdered.
3) TOCN/BNNS composite membrane processed: the TOCN dispersion liquid of above-mentioned preparation is blended with BNNS with volume ratio 88:12
Then mixed dispersion liquid magneton is stirred 30min, ultrasound 4min, after mixing casting film-forming and at 35 DEG C by (being denoted as TB12)
TOCN/BNNS composite membrane is made in lower dry；
4) CLTOCN/BNNS composite membrane processed: by 22.2g CaCl2Powder is added in 1000ml deionized water, and stirring is extremely
It is uniformly mixed, the CaCl of 0.2mol/L is made2Salting liquid；TB12 laminated film is put into the above-mentioned CaCl of 200ml again2In salting liquid
3h is impregnated, more than three times through water washing, CLTOCN/BNNS composite membrane (being denoted as CLTB12) is made after drying at 35 DEG C.Wherein,
BNNS accounts for the 12% of composite membrane total volume.
Composite membrane manufactured in the present embodiment is tested using method same as Example 1, is surveyed under 1KHz frequency
The dielectric loss for obtaining composite membrane is 0.029, breakdown strength 358.6KV/mm, can obtain CLTB12 film and the pure TOCN of comparative example 1
Film reduces 58.6% compared to dielectric loss, and breakdown strength improves 85.6%, the dielectric loss compared with the TB12 film of comparative example 2
Reduce 83.9%；By the way that CLTB12 is calculated in 350MVm-1Electric field in maximum energy storage density be up to 2.97Jcm-3；Furthermore CLTB12 composite membrane is in 50~300MVm-1Electric field under, the efficiency for charge-discharge of film is 87% or more.
Claims (9)
1. a kind of preparation method of crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane, it is characterised in that including following
Step:
1) nano-cellulose dispersion liquid is prepared:
TEMPO and NaBr is added in deionized water, stirs to being completely dissolved, native cellulose, NaClO is then added, use
NaOH solution regulation system pH value is 9~11, is filtered, washed after 0.5~7h of oxidation reaction at 10~30 DEG C, is dried to obtain and receives
Rice cellulose, surveys its water content；It is added it in distilled water again and is dispersed to obtain nano-cellulose dispersion liquid, i.e. TOCN points
Dispersion liquid；
2) hexagonal boron nitride nanosheet powder is prepared:
Hexagonal boron nitride raw material powder is mixed with triethanolamine, supernatant is taken after agitated, centrifugation, hexagonal boron nitride is made
Dispersion liquid；Deionized water is added in dispersion liquid again to be sufficiently mixed, filtered, washed；The product redisperse obtained after washing
It in deionized water, is installed to be placed in liquid nitrogen with centrifuge tube and is rapidly frozen, be finally put into the centrifuge tube freezed cold
Freeze drying box, is freeze-dried to powdered；
3) nano-cellulose/hexagonal boron nitride nanosheet composite membrane is prepared:
Gained nano-cellulose dispersion liquid is mixed with gained hexagonal boron nitride nanosheet powder, then carries out mixed dispersion liquid
Stirring, ultrasound through casting film-forming and dry obtained nano-cellulose/hexagonal boron nitride nanosheet composite membrane；
4) crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane is prepared:
By CaCl2Powder is add to deionized water, and CaCl is made to being uniformly mixed in stirring2Solution；Again by step 3 gained nanometer
Cellulose/hexagonal boron nitride nanosheet laminated film is put into the CaCl20.1~10h is impregnated in solution, after water washing, is dried
It is drying to obtain crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane.
2. the preparation method of crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane as described in claim 1, feature exist
TEMPO, NaBr, native cellulose, NaClO are 1:(1~10 in mass ratio in step 1): (10-100): (10-100).
3. the preparation method of crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane as described in claim 1, feature exist
Hexagonal boron nitride raw material powder and triethanolamine are 1:(100~1000 in mass ratio in step 2).
4. the preparation method of crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane as described in claim 1, feature exist
Volume percent nano-cellulose dispersion liquid 80%~99%, hexagonal boron nitride nanosheet powder are pressed in step 3 mixed system
End is 1%~20%.
5. the preparation method of crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane as described in claim 1, feature exist
The native cellulose described in step 1 is cotton cellulose, wood pulp, flaxen fiber, bagasse, cocoanut shell, shuck, wheat straw, rice
One of bar, bacteria cellulose, ascidian cellulose are a variety of.
6. the preparation method of crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane as described in claim 1, feature exist
Dispersing mode in step 1 is mechanical stirring, ultrasound or high pressure water process.
7. the preparation method of crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane as described in claim 1, feature exist
The nano-cellulose dispersion liquid mass concentration described in step 3 is 0.1~1%；The nano-cellulose diameter is in 2~20nm, length
Degree is in 100nm~5 μm.
8. the preparation method of crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane as described in claim 1, feature exist
The CaCl described in step 42The concentration of solution is 0.1~1mol/L.
9. the preparation method of crosslinking nano cellulose/hexagonal boron nitride nanosheet composite membrane as described in claim 1, feature exist
Drying temperature is 30~60 DEG C in step 3 and step 4.
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