CN104452436B - A kind of nano-cellulose dispersant and its preparation method and application - Google Patents
A kind of nano-cellulose dispersant and its preparation method and application Download PDFInfo
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Abstract
The invention discloses a kind of nano-cellulose dispersants and its preparation method and application, and nano-cellulose dispersant is prepared by following methods：The over dry softwood pulp of the unseasoned mistakes of 5g is sufficiently mixed uniformly with 78mg TEMPO, 514mg NaBr；Reaction is caused by the addition of 30mL 12%NaClO, and is reacted under stirring at room temperature；The pH value of system is stablized by NaOH controls 10.5；Until system in residue NaClO the reaction was complete end；Slurry after reaction is clean by filtration washing, until pH is in neutrality；Obtained fiber is made into 1% concentration to handle under 5 ~ 25KPa pressure by microfluidizer；Obtain transparent nanofiber element dispersion liquid；Dispersion liquid is stored and 4 DEG C of refrigerators.The present invention disperses two-dimensional material BN and MoS2 using NFC as dispersant and one-dimensional material CNT, dispersing method are simple.Using environmentally protective aqueous solvent and dispersant, dispersion efficiency is high, can carry out the high-volume dispersion of material.Due to the green non-poisonous property of NFC, the material of NFC aid dispersions can be applied not only to energy storage device.
Description
Technical field
The present invention relates to nano-cellulose dispersant technical field, more particularly to a kind of nano-cellulose dispersant and its system
Preparation Method and application.
Background technology
The nano-cellulose separated in wood is green non-poisonous, and diameter can be in micron range in nanometer range, length.
Because of its good mechanics, optically and thermally property, it is utilized as the structural unit material of food thickening agent, superpower compound
The base material of material, the diaphragm paper of battery and electronic equipment.Due to the presence of surface great amount of hydroxy group, nano-cellulose is typically considered to
It is hydrophilic material, however, studies have shown that：Cellulose surface equally has the hydrophobic work generated because of the exposure of-CH groups
Property face.Just because of nano-cellulose have it is amphipathic, it be used as emulsifier prepare pickering lotions.Use Nanowire
Dimension element stablizes nano-particle and be dispersed in water CNT as dispersant as stabilizer all to be had been reported that.To nano-cellulose
Surface carries out suitable modification, such as surface silanization handles, is carboxymethyl modified, can further improve nano-cellulose as steady
Determine the effect of agent.
Two-dimensional material is that a kind of inter-layer bonding force is weaker, and the material that layer internal bond is strong, now increasingly by people
Concern.Common two-dimensional material has：Graphite, boron nitride (BN), transition metal dichalcogenide (MoS2, WS2) and some gold
Belong to oxide (MoO3, MnO2).Based on the property of this kind of material, they have been widely used.Usual Heat Conduction Material also has
There is good electric conductivity, however material is needed to have good thermal conductivity but without hope there is electric conductivity in some applications.BN is exactly
This kind of material.It is also good insulating materials that BN, which has good thermal conductivity, thermal stability simultaneously, thus in protection materials and
There is research application extensively on insulating dielectric materials.MoS2Because of its absorbent properties in solar spectrum area, in electronic equipment and photoelectricity
It is concerned on material.These two-dimensional materials can either blasting procedure separates thickness in nanometer or atomic layer by shearing force
Flaky material, stripping or dispersion of this process two-dimensional material.The dispersion of two-dimensional material can obtain high-specific surface area
Material, be applied to surface active material or catalyst.Another effect that dispersion generates is that the electrical properties of material change
Become.Because in massive material, electron waves can extend in three-dimensional, and the transmission of electron waves is limited in material in two-dimensional material
The two-dimensional directional of material.Such as MoS2：The MoS of bulk2For indirect band gap；Single layer MoS after dispersion2For direct band gap, can generate
Strong luminescence generated by light phenomenon.To give full play to the performance of two-dimensional material, the effectively dispersion of two-dimensional material is essential.Receive blueness
The dispersing method looked at is liquid dispersion method.Because liquid dispersion method can be used for the large-scale production of two-dimension nano materials, obtain
Dispersion liquid can prepare be used to prepare functional complex, be suitable for roller type production routine.When liquid processes are disperseed using green
Color solution green dispersant is more favourable for the carry out on a large scale of dispersion.Because of influence of the green non-poisonous chemicals to environment
It is small, the recycling post-processing of solvent can be reduced or prevent, thus cost can be reduced.
The another kind of material for being widely used but being difficult to disperse is CNT.CNT is electric conductivity, thermal conductivity and mechanical property in the world
One of highest material of energy, therefore it is widely used in the system of electrically conductive composite.The conductivity and mechanical performance of electrically conductive composite
Compatibility between by the dispersity of CNT, the ordered arrangement of CNT and matrix and CNT is influenced.CNT in the base fully divide
It dissipates (with single or several CNT aggregations state presence), is to prepare high-performance CNT compound premises.CNT is nonpolar material
Material, and large specific surface area, thus Van der Waals for is huge between CNT.These result in CNT, and easily wadding is poly- in aqueous solution, difficult
In water with stable dispersion.People have carried out a large amount of further investigations to CNT chemical modifications with the dispersion performance for improving CNT.But change
The structure of CNT itself can be destroyed by learning modification, increase the cost of product；Due to the introducing of synthetic polymer or functional group, can subtract
Connection between few CNT is to reduce the electric conductivity of product.To substitute the use of synthetic polymer, inexpensive nano material is disperseed
The research of CNT gradually increases, and wherein nano-cellulose is concerned.
Invention content
Goal of the invention：For the deficiencies in the prior art, the purpose of the present invention is to provide a kind of nano-celluloses
Dispersant, to which a peacekeeping two-dimensional material can be disperseed.It is a further object of the present invention to provide above-mentioned nano-cellulose dispersants
Preparation method.Further object of the present invention is to provide the application of above-mentioned nano-cellulose dispersant.
Technical solution：In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows：
A kind of nano-cellulose dispersant, is prepared by following methods：The over dry softwood pulp of the unseasoned mistakes of 5g with
78mg TEMPO, 514mg NaBr are sufficiently mixed uniformly；Reaction is caused by the addition of 30mL 12%NaClO, and is stirred in room temperature
It mixes down and reacts；The pH value of system is stablized by NaOH controls 10.5；Until system in residue NaClO the reaction was complete tie
Beam；Slurry after reaction is clean by filtration washing, until pH is in neutrality；The concentration that obtained fiber is made into 1% is penetrated by micro-
Stream machine is handled under 5~25k Pa pressure；Obtain transparent nanofiber element dispersion liquid；Dispersion liquid is stored and 4 DEG C of refrigerators.
A method of the nano-cellulose dispersant is prepared, is included the following steps：The over dry needle of the unseasoned mistakes of 5g
Leaf wood pulp is sufficiently mixed uniformly with 78mg TEMPO, 514mg NaBr；Reaction is caused by the addition of 30mL 12%NaClO, and
It reacts under stirring at room temperature；The pH value of system is stablized by NaOH controls 10.5；Until residue NaClO reactions in system
It is fully completed；Slurry after reaction is clean by filtration washing, until pH is in neutrality；Obtained fiber is made into 1% concentration to lead to
Microfluidizer is crossed to handle under 25k Pa pressure；Obtain transparent nanofiber element dispersion liquid；Dispersion liquid is stored and 4 DEG C of refrigerators.
Application of the nano-cellulose as dispersant.
The nano-cellulose dispersant is in dispersion two-dimensional material BN and MoS2In application.
The application, it is characterised in that：The dispersion liquid concentration of BN is up to 1.1mg/mL.
The application, it is characterised in that：MoS2Dispersion liquid concentration be up to 0.9mg/mL.
Application of the nano-cellulose dispersant in disperseing one-dimensional material CNT.
Advantageous effect：Compared with prior art, the invention has the advantages that and high-lighting effect：NFC is as dispersant
Disperse two-dimensional material BN and MoS2 and one-dimensional material CNT, dispersing method is simple, and obtained dispersion liquid concentration is high, and (BN is a concentration of
1.1mg/mL, MoS2Dispersion liquid concentration be up to 0.9mg/mL), dispersion yield is high (yield of BN is 22%).And NFC adds
Dosage increases, and the concentration of dispersion liquid increases.Using environmentally protective aqueous solvent and dispersant, dispersion efficiency is high, can carry out material
High-volume dispersion.Due to the green non-poisonous property of NFC, the material of NFC aid dispersions can be applied not only to energy storage device, in life
Scientific domain is ordered also by important application prospect.
Description of the drawings
Fig. 1 is the characterization result figure of TEMPO method oxycelluloses；
Fig. 2 is the characterization result figure that TEMPO oxycelluloses can once obtain NFC later by microfluidizer；
Fig. 3 is the BN and MoS after dispersion2Characterization result figure；
Fig. 4 is the result figure of TEM characterization dispersions；
Fig. 5 is NFC dispersion CNT result figures.
Specific implementation mode
With reference to specific embodiment, the present invention is described further, but the present invention is not limited by following embodiment
System.
The main agents used in following embodiment and instrument are as follows：
BN powder (Graphene supermarket, Inc.)；Ultraviolet spectrometer UV-Vis Spectrometer Lambda
35 (PerkInElmer, USA)；Transmission electron microscope (TEM, FEI QUANTA 200, the U.S.)；Zeta potential tester model
Zetasizer Nano ZS90 (Malvern Instruments, Worcestershire, UK)；Dynamic mechanical analyzer is analyzed
(DMA, Q800)；Hitachi (HITACHI) S-510 scanning electron microscope；Ultrasound Instrument (FS 110D, Fisher Scientific).Bleaching
Needlebush pulpboard is Brazilian snapper board, and it is 150mL that slurry, which first passes through a watt power beater and gets to Canadian freeness,.
Embodiment 1NFC preparation and representations
The over dry softwood pulp of the unseasoned mistakes of 5g is sufficiently mixed uniformly with 78mg TEMPO, 514mg NaBr.Reaction passes through
The addition of 30mL 12%NaClO causes, and reacts under stirring at room temperature.The pH value of system is stablized by NaOH controls
10.5.Until system in residue NaClO the reaction was complete end.Slurry after reaction is clean by filtration washing, until pH is in neutrality.
The concentration that obtained fiber is made into 1% passes through microfluidizer (5-25k Pa) processing under stress.Obtain transparent nanofiber
Plain (NFC) dispersion liquid.It is for use in dispersion liquid storage and 4 DEG C of refrigerators.
Scanning electron microscope (SEM) is observed：After sample to be tested is dried in vacuo, platform, vacuum metal spraying, operating condition voltage are glued
For 20kV.
The long width of nano-cellulose is characterized with fiber morphology by atomic force microscope (AFM) using transmission electron microscope.TEM
Drip that 10 μ L nano-celluloses solution are online in charcoal, and extra liquid is siphoned away with filter paper when sample preparation, operation voltage is 100kV.AFM
When sample preparation, drop 10 μ L nano-celluloses solution on the silicon chip of 1cm × 1cm, by spin coating instrument by nano-cellulose on silicon chip
It smoothens.Observation characterization is carried out after drying under tapping-mode.
Solution Zeta potential is obtained by Zeta potential tester.NFC liquid quality fractions are 0.7mg/mL when test,
PH is 7.8.
For characterization result as shown in Figure 1, wherein a-c is the SEM figures of TEMPO oxidized fibres, d is prepared by TEMPO oxidized fibres
Cellophane paper, e is write conductive ink on the paper of TEMPO oxidized fibres preparation, and f is the conductor wire write of ammeter test display
With good electric conductivity, g is to obtain diode by ball stroke on paper prepared by TEMPO oxidized fibres.At TEMPO oxidations
After managing fiber, 6 hydroxyls of fiber surface C are oxidized to carboxyl, increase the charged group content on fiber.Simultaneously because fine
The oxidation reaction of dimension and churned mechanically active force, interfibrous bond strength reduce, and the breakage of cell wall occurs for fiber surface,
Even there is longitudinal cracking (a-b in Fig. 1).At the same time, the length of fiber reduces, width reduces, fiber fines in solution
Content increases.High power surface sweeping electricity microscopic observation fiber surface (c in Fig. 1) it is found that a large amount of microfibre is contained on surface, and
In meshy arrangement.This meets the structure of microfibre in timber primary wall.Although the fiber overwhelming majority after TEMPO oxidations is still
For micrometer fibers, but solution has certain viscosity and transparency.Fiber directly after filtering TEMPO oxidations can obtain
Paper (d in Fig. 1) that be transparent and having certain mist degree.Paper maintains good writing quality simultaneously, with surface flatness.Surface
Smoothness may mainly have the nanofibres deposit generated in preparation process to be caused in paper surface.E-g in Fig. 1 is in paper
Upper writing conductive material prepares the paper substrate electronic equipment that can be write.
For TEMPO oxycelluloses once by that can obtain NFC after microfluidizer, the results are shown in Figure 2, wherein low
Under times a and high power b the TEM of NFC schemes, the AFM that c is NFC schemes, and d is NFC solution, and e is that green laser irradiates NFC solution, and f is
Petrographic microscope picture when NFC solution concentrations are 1%, g are NFC gels.It is bigger by the pressure of microfluidizer, it obtains
NFC sizes are smaller.A in Fig. 2 is the NFC handled by the microfluidizer of 25k Pa pressure.Its diameter is less than 10nm, long
Degree is at hundreds of nanometers.High magnification TEM figures (b in Fig. 2) show that NFC has beautiful crystalline texture.AFM is also used to characterize
NFC patterns (c in Fig. 2), the NFC diameters shown in AFM figures are slightly larger than TEM as a result, this is related with characterization method.The water of NFC
The characteristics of solution, is the Tyndall phenomenon of its optical transparence (d in Fig. 2) and nano-solution.Since NFC shows to contain
There is the charged group that TEMPO oxidations introduce, NFC can be with stable dispersion in water.Zeta potential test is carried out to NFC solution to know：
The Zeta potential of solution is -64.9mV, it was confirmed that the good stability of solution.NFC has the characteristic of self assembly, when NFC solution
When a concentration of 1%, solution starts to embody liquid crystal form, as shown in the e in Fig. 2.Further increase the concentration of NFC solution, NFC
Gel change can be formed, such as the f in Fig. 2.
Embodiment 2BN, MoS2Dispersion with CNT and characterization
First commercially available BN powder (Graphene supermarket, Inc.) is mixed in water with corresponding BN mass 10wt%NFC
It closes.BN initial concentrations are 5mg/mL.Dispersion by by mixed liquor in groove type ultrasonic instrument ultrasonic (groove type ultrasonic instrument, ultrasonic power
200W, ultrasonic time 30h) it realizes.Solution after ultrasound centrifuges 15min under 3000r/min rotating speeds, and it is clear that upper layer is then demultiplex out
Liquid.The absorption spectrum of solution is tested on ultraviolet spectrometer and is obtained.
MoS2There is (SPI Supplies) in the form of ore, dispersing method is the same as BN dispersing methods.The additive amount of NFC is distinguished
For MoS2The 10wt% and 50wt% of quality.Ultrasonic time is 4h, centrifugal rotational speed 5000r/min.The absorption spectrum of solution exists
Test obtains on ultraviolet spectrometer.
First CNT (Carbon Solution) and mass ratio 1:1 NFC is mixed in water.CNT initial concentrations are 1mg/
mL.Then by mixed liquor in probe type ultrasonic instrument ultrasound 5min.Solution after ultrasound centrifuges under 3000r/min rotating speeds
15min isolates supernatant liquor.The absorption spectrum of solution is tested on ultraviolet spectrometer and is obtained.
BN after dispersion and MoS2It is characterized using transmission electron microscope.It is online in charcoal that 10 μ L dispersion liquids are dripped when TEM sample preparations, it is extra
Liquid siphons away drying with filter paper.
Solution Zeta potential is obtained by Zeta potential tester.BN pH value of solution is 7.8 when test；MoS2PH value of solution is
7.7；CNT solution ph is 7.7.
The results are shown in Figure 3, wherein a be NFC AFM scheme, b be do not contain and containing NFC BN dispersion liquids standing 10
Its later figure, c are not contain and figure of the standing of MoS2 dispersion liquids containing NFC after 2 months, d-e be respectively BN and
MoS2 ultra-violet absorption spectrums, insertion figure are respectively the BN dispersion liquids for disposably disperseing to obtain and MoS2 dispersion liquids.Two-dimensional material
Dispersion is that dispersant ultrasound in groove type ultrasonic instrument is realized by using NFC.NFC length about 50-200nm as dispersant,
Diameter about 10-20nm (a in Fig. 3).Because of the introducing of charged group, NFC aqueous dispersions are highly stable, and solution is transparent.It is molten
The stability of liquid is characterized usually using zeta current potentials.Zeta potential is less than 20 or indicates that solution is unstable more than -20mV；Numerical value
When 20-30mV or -30 arrives -20mV, solution is in metastable state；Numerical value is when 30-40mV or -40 arrives -30mV, solution
For compared with stablizing solution；It is stablizing solution when numerical value is that 40-60mV or -60 arrives -40mV；Numerical value be more than 60mV or less than-
It is highly stable solution when 60mV.The Zeta potential of NFC solution is -64.9mV, it was confirmed that solution has good stability.Quilt
The BN of dispersion is powdered, and average transverse is 5 μm；MoS2Exist with mineral forms.Due to the addition of dispersant NFC, BN
It is simply just dispersed in water very much.Obtained BN solution, a concentration of 1.1mg/mL, dispersion yield (in dispersion liquid BN mass with it is former
BN mass ratioes in material) it is 22%, it is the highest yield of current supercritical ultrasonics technology dispersion BN.And obtained BN dispersion liquids have good
Good stability.As shown in the b in Fig. 3：After dispersion liquid stands 10 days, not plus there is wadding coagulation and forms sediment in the solution of NFC dispersants
Phenomenon, the BN dispersion liquids that NFC dispersants are added are still highly stable.The stability of solution is mainly generated by NFC surface carboxyl groups
Electrostatic repulsion forces cause.To characterize the stability of solution, the zeta current potentials of solution are tested.The BN solution of NFC aid dispersions,
Zeta potential is -41.9mV, shows that stability of solution is good, while also demonstrating electrostatic repulsion forces stable mechanism.Because of MoS2's
Hydrophobicity, it is difficult to disperse in water.However MoS after addition NFC2It is easy to be dispersed in water.Usually need in organic solvent
Wanting ultrasound to be more than 20h could MoS2Dispersion, after NFC is added, ultrasonic 4h can must obtain the MoS of dispersion yield 18%2Dispersion liquid.
Comparison does not add the MoS of NFC2Dispersion liquid, the MoS of NFC aid dispersions2Dispersion liquid color is deeper.Calculate MoS2Dispersion liquid concentration can
Know, the dispersion liquid concentration for adding 10%NFC is 0.3mg/mL, and the dispersion liquid concentration for adding 50wt%NFC is 0.9mg/mL.This
The result shows that MoS can be improved by increasing NFC additive amounts2Dispersion.MoS2Dispersion whole process only needs 4h, far smaller than ion
Insertion disperses MoS2Required time (20h).And whole process only needs to add MoS when starting2The 10% of quality
NFC, dispersant dosage be significantly lower than other polymers aid dispersion dispersant dosage.Usual polymer volume is MoS2Matter
10 times of amount.NFC additive amounts disperse MoS also below with dispersion agent method2When dispersant dosage (dispersant dosage MoS2Matter
The 30wt% of amount).The MoS that NFC aid dispersions obtain2Dispersion liquid is highly stable.C in Fig. 3 is MoS2Dispersion liquid stands one section
Photo after time.Not plus the MoS of NFC2Dispersion liquid just precipitates after standing 1 day, and the MoS of NFC aid dispersions2Point
Dispersion liquid is still highly stable after standing 2 months.Test the MoS of 10%NFC aid dispersions2Dispersion liquid Zeta potential is -38.3
MV shows that solution is very stable.
Ultra-violet absorption spectrum test has been carried out to solution, come detect solution whether be fine dispersion solution.D in Fig. 3
For the absorption spectrum of BN dispersion liquids, there are an apparent BN characteristic absorption peaks at 203nm, the BN dispersion liquid absorption peaks with report
Position consistency.E in Fig. 3 is MoS2Dispersion liquid abosrption spectrogram, pop have two apparent suctions at 605nm and 664nm respectively
Receive peak.The MoS of this absorption peak and grinding auxiliary liquid dispersion at two2Dispersion liquid peak position is consistent.The absorption spectrum of dispersion liquid
Figure demonstrates material and has been broken up into single layer or multi-layer nano piece in a solvent.The above results show can by dispersant of NFC
With effectively by BN and MoS2It is dispersed in water.The method of dispersion is simple, efficient, is suitble to the extensive dispersion of two-dimensional material.It is real
Testing under the conditions of room readily can disposably obtain 200mL two-dimensional material dispersion liquids.The insertion figure of d-e in Fig. 3 is respectively one
The BN dispersion liquids and MoS that secondary property is disperseed2Dispersion liquid.
The size of the BN pieces of dispersion is characterized with TEM, as shown in figure 4, a-b is not contain and c is the BN containing NFC
The TEM of dispersion liquid schemes, and d is not contain and e-f is the MoS containing NFC2The TEM of dispersion liquid schemes, and g-i is the BN of NFC dispersions
TEM figures and corresponding rubidium marking figure, red arrow be directed toward fiber.Not plus the BN lateral dimensions that disperse of NFC are in 50-
300nm ranges (a-b in Fig. 4).The BN lateral dimension sizes that NFC dispersants are added do not wait (in Fig. 3 from 200nm to micron
c).This is because NFC is adsorbed on BN on pieces, protecting BN pieces, the dispersion force caused by ultrasonic wave is not smashed.Similar result exists
MoS2Dispersion in also by embodying.Not plus the MoS of NFC2In dispersion liquid, MoS2Lateral dimension size is about 100nm；NFC is added
The MoS of dispersant2MoS2 lateral dimension sizes are about 500nm (d-f in Fig. 4) in dispersion liquid.Obviously to indicate that NFC is adsorbed on
BN/MoS2On piece has carried out rubidium marking by taking BN as an example.G in Fig. 4 is the BN pieces for carrying out rubidium marking, h-i points in Fig. 4
Not Wei N and B rubidium marking figure, show that selected piece is BN.J in Fig. 4 is the label figure of O elements, shows NFC in BN on pieces
Distribution.BN on pieces have a large amount of NFC as seen from the figure.
Fig. 5 be NFC dispersion CNT result figures, wherein in a 1 be not added with NFC and 2 addition NFC SWNT be dispersed in water
Picture, the ultraviolet spectrogram that b is NFC solution with the CNT solution of NFC dispersions, c is CNT-NFC gels.
Used CNT be partially modified mistake single-walled carbon nanotube (SWNT), diameter about 5nm, 1-5 μm of length, point
In powdered before dissipating.The dispersion of CNT is realized by ultrasonication, is centrifuged to solution after ultrasound undispersed to remove
CNT.A in Fig. 5 is the state after standing 1 day after CNT ultrasonic disperses, is not added with NFC in No. 1 sample, is added in No. 2 samples
With CNT mass 1：1 NFC.As a result it is poly- to be not easy wadding for the sample stability higher for showing addition NFC.To obtained NFC solution
Zeta potential characterization is carried out, the Zeta potential for obtaining solution is -54.9mV, shows stability of solution height.Pure NFC solution Zeta
Current potential is that -54.9mV carries out ultraviolet spectral analysis to solution, occurs SWNT characteristic peaks in collection of illustrative plates, and display CNT is effectively disperseed
(b in Fig. 5).This dispersing method makes the extensive of CNT be dispersed into possibility, and obtained CNT solution can be used for preparing
Electrically conductive composite, conductive ink etc..The concentration of CNF weak solutions be can be obtained into CNT gels (c in Fig. 5), to gel with not Tongfang
Formula drying can prepare different electrically conductive composites.
The above result shows that NFC can be used as dispersant by BN, MoS2, CNT is dispersed in water.
Claims (2)
1. nano-cellulose dispersant is in dispersion two-dimensional material BN and MoS2In application；The nano-cellulose is by following methods
It is prepared：The over dry softwood pulp of the unseasoned mistakes of 5g is sufficiently mixed uniformly with 78mg TEMPO, 514mg NaBr；Reaction passes through
The addition of 30mL 12%NaClO causes, and reacts under stirring at room temperature；The pH value of system is stablized by NaOH controls
10.5；Until system in residue NaClO the reaction was complete end；Slurry after reaction is clean by filtration washing, until pH is in neutrality；
Obtained fiber is made into 1% concentration to handle under 5~25k Pa pressure by microfluidizer；Obtain transparent nanofiber element
Dispersion liquid；Dispersion liquid is stored and 4 DEG C of refrigerators；The dispersion liquid concentration of BN is up to 1.1mg/mL；MoS2Dispersion liquid concentration be up to
0.9mg/mL。
2. application of the nano-cellulose dispersant in disperseing one-dimensional material CNT；The nano-cellulose is prepared by following methods
It obtains：The over dry softwood pulp of the unseasoned mistakes of 5g is sufficiently mixed uniformly with 78mg TEMPO, 514mg NaBr；Reaction passes through 30mL
The addition of 12%NaClO causes, and reacts under stirring at room temperature；The pH value of system is stablized by NaOH controls 10.5；
Until system in residue NaClO the reaction was complete end；Slurry after reaction is clean by filtration washing, until pH is in neutrality；Will
To fiber be made into 1% concentration and handled under 5~25k Pa pressure by microfluidizer；Obtain the dispersion of transparent nanofiber element
Liquid；Dispersion liquid is stored and 4 DEG C of refrigerators.
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| CN117461830B (en) * | 2023-11-14 | 2024-08-02 | 北京工商大学 | Cellulose nanofiber and sodium alginate composite microgel with lubricating effect and preparation method thereof |
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