CN107828069B - A kind of acrylamide/nano-cellulose plural gel and preparation method thereof - Google Patents
A kind of acrylamide/nano-cellulose plural gel and preparation method thereof Download PDFInfo
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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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/075—Macromolecular gels
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F120/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F120/52—Amides or imides
- C08F120/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F120/56—Acrylamide; Methacrylamide
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/24—Homopolymers or copolymers of amides or imides
- C08L33/26—Homopolymers or copolymers of acrylamide or methacrylamide
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- 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
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/24—Homopolymers or copolymers of amides or imides
- C08J2333/26—Homopolymers or copolymers of acrylamide or methacrylamide
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2401/02—Cellulose; Modified cellulose
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Abstract
The invention discloses a kind of acrylamide/nano-cellulose plural gels and preparation method thereof.The preparation method includes the following steps: that acrylamide, initiator and crosslinking agent are added into the suspension of nano-cellulose, obtains through plastic.Since conventional polymer gel is in three-dimensional hole network structure, wherein main component is hydrone, and the chain structure of gel is loose, and intensity is weaker, has certain mobility, intensity needed for being unable to reach the gel valve in field use.Especially for high pressure formation, conventional polymer gel not can effectively stop oil gas spilling.In view of this, the present invention usually achievees the effect that enhance its intensity by adding nanofiber in polymer gel, and then the mechanical strength of gel valve is improved, improves performance of the gel valve in casing.The present invention has also investigated the interaction between nano-cellulose and polymer simultaneously, and nano-scale cellulose improves the mechanism of action of gel strength, has directive significance to gel valve mechanical performance is improved.
Description
Technical field
The present invention relates to a kind of plural gels and preparation method thereof, and in particular to a kind of acrylamide/nano-cellulose is multiple
Close gel and preparation method thereof.
Background technique
In order to meet the needs of development of world economy is to petroleum, the emphasis of petroleum exploration and development is had been transferred to middle or small at present
Type oil field, the oil field under complicated geological surface conditions, unconventional petroleum resources and intermediary and later stages oil field transformation, tap the latent power up.
This form causes the difficulty of exploration and development to increase, and input cost increases, and there is an urgent need to oil-gas exploration and development new technologies, reduces stone
The cost of exploration & development of oil is then one of the vital task in current petroleum industry upstream field.For China, special oil gas money
Source distribution is more than each elephant in the whole nation, the one third of the total proved reserves of reserves Zhan.In the drilling process of conventional oil field,
Since long-term Overbalance Drilling causes oil reservoir to pollute, the phenomenon that blocking, happens occasionally, and quite a few mid-later development phase
Oil field enters low pressure oil field scope due to pressure decline, and thus under-balanced drilling technology is obtained extensively with its unique advantage
Application.
Using under-balanced drilling technology drilling well, since drilling well liquid columnpressure is lower than strata pressure, drilling fluid filter in pit shaft
The leak-off and intrusion of liquid and harmful solid phase will be mitigated or eliminated, to be effectively protected oil-gas Layer, reduce or remove from oil-gas Layer
The expense of the work measures such as transformation and valuableness.In addition, due to head of liquid reduction on bit face during under balance pressure drilling, just
More easily broken in drilled rock, the circulating liquid of low-density helps to reduce " chip hold down effect ", and drill bit is made to continue to cut newly
Rock rather than repeat roll fragmented rock, reduce the repetition Fragmentation Phenomena of landwaste, can effectively improve power auger
Speed, extends the service life of drill bit, to improve drilling efficiency, shortens drilling period, reduces drilling cost.
In order to ensure the effect of under balance pressure drilling, the country proposes the concept of " overall process under-balance drilling ", i.e., opens from brill
Oil-gas Layer will realize underbalance until complete well, external also to use insufficient balance well completion and underbalance operation in succession.It is general at present logical
It crosses two methods and realizes overall process under-balance: the method that makes a trip by force and underground isolation method.The method of making a trip is to use to rise by force by force
Lower boring device carries out a kind of operational method of overall process under-balance.According to overall process under-balance technical requirements, is creeping into and removing
The circulating pressure of drilling fluid should be less than formation pore pressure during brill, require during the entire process of such underbalance operation
Rotary blowout preventer sealing wellhead pressure.And underground isolation method carries out overall process under-balance operation using downhole isolation system
A kind of method.Downhole isolation system mainly by down hole sleeve valve, ground hydraulic control device, bale of pipeline, various transit joints and
The composition such as attachment.Casing valve is lowered into projected depth with protective casing, and there is a set of hydraulic control device on ground, and two hydraulic
The bale of pipeline of pipeline composition is connected to always down hole sleeve valve from ground control unit.According to construction needs, the control of operation ground
Device opens or closes the valve.
But there are some disadvantages in the two, non-snubbing service device needs the plenty of time to pacify before use in practical applications
Install it is standby, be also required in use process the plenty of time realize pull out of hole and tripping operation, in addition the device is during sieve tube completion
It can not achieve safe kill-job operation.Down hole sleeve valve is then mainly by import, and higher cost, furthermore drilling process is since there are hole deviations
Reason, drilling tool, which may damage it, causes control system failure.
Therefore, seeking under balance pressure drilling and completion technique adaptable, at low cost, that risk is small seems very urgent.Separately
Outside, common, basic kill-job operation in well workover construction, used in well killing fluid generally contain some solid phase particles, and
Some chemical substances that harmful precipitating is generated with formation fluid, this makes well killing fluid used in well workover process that can generate one to reservoir
Fixed injury also needs to develop the well killing fluid to reservoir Low Damage.
Wide research is expanded to the well killing fluid of Low Damage both at home and abroad.Mainly using non-fixed phase well control fluid and using respectively
Kind cleaning insulating liquid is isolated by well killing fluid with reservoir fluid, to reduce injury of the well killing fluid to reservoir.But these methods itself
The effect of well killing fluid is not had.A Duan Qiang is formed in the pit shaft in the middle part of reservoir between oil pipe column bottom using organogel
Very high colloid section is spent, is drilled well and well workover process safety packing pit shaft to realize, and mud, drilling fluid and reservoir can be had
Effect separates, and effectively well killing fluid is prevented to enter stratum, while the gases such as hydrogen sulfide that stratum can be prevented to summarize escape outward, are expected to
Overcome the kill-job construction method of current routine to the deficiency of the injury of reservoir and operating expenses valuableness.
Summary of the invention
The object of the present invention is to provide a kind of acrylamide/nano-cellulose plural gel and preparation method thereof, the present invention
Achieve the effect that enhance its intensity by the way that nano-cellulose is added in polymer gel, and then the machinery for improving gel valve is strong
Degree improves performance of the gel valve in casing.
Acrylamide provided by the present invention/nano-cellulose plural gel preparation method, includes the following steps:
Acrylamide, initiator and crosslinking agent are added into the suspension of nano-cellulose, is obtained through plastic described poly-
Acrylamide/nano-cellulose plural gel.
In above-mentioned preparation method, in cross-linking system, the mass concentration of the acrylamide can be 4~7%；
The mass concentration of the nano-cellulose can be 0.5~5%；
The cross-linking system is the mixed of the nano-cellulose, the acrylamide, the initiator and the crosslinking agent
Close liquid；
The quality of the initiator is the 0.3~0.8% of the gross mass of the acrylamide and the nano-cellulose, tool
Body can be 0.5%；
The quality of the crosslinking agent is the 0.3~0.8% of the gross mass of the acrylamide and the nano-cellulose, tool
Body can be 0.5%.
In above-mentioned preparation method, the initiator and the crosslinking agent are added in the form of its solution, such as aqueous solution.
In above-mentioned preparation method, initiator conventional in the art, such as potassium peroxydisulfate is may be selected in the initiator；
Crosslinking agent conventional in the art may be selected in the crosslinking agent, such as NN- methylene-bisacrylamide.
In above-mentioned preparation method, the condition of the plastic is as follows:
Temperature is 60~80 DEG C；
Time is 2~4 hours.
In above-mentioned preparation method, the nano-cellulose can be Cellulose nanocrystal body (NCC) or cellulose Nanowire
Silk (CNF)；
The specification of the Cellulose nanocrystal body is as follows: long: 20~500nm wide: 4~5nm；
The specification of the cellulose nanometer fibril is as follows: long: > 1 μm wide: 35nm.
The acrylamide that the above method is prepared/nano-cellulose plural gel also belongs to protection scope of the present invention.
Since conventional polymer gel is in three-dimensional hole network structure, wherein main component is hydrone, the chain of gel
Shape short texture, intensity is weaker, has certain mobility, intensity needed for being unable to reach the gel valve in field use.It is special
It is not for high pressure formation, conventional polymer gel not can effectively stop oil gas spilling.In view of this, the present invention is by polymerizeing
Nanofiber is added in object gel usually to achieve the effect that enhance its intensity, and then improves the mechanical strength of gel valve, is improved and is frozen
Performance of the glue valve in casing.The present invention has also investigated the interaction between nano-cellulose and polymer simultaneously, and exploration is received
Rice cellulose improves the mechanism of action of gel strength, has directive significance to gel valve mechanical performance is improved.
Detailed description of the invention
Fig. 1 is acrylamide/nano-cellulose plural gel stereoscan photograph prepared by the embodiment of the present invention 1.
Fig. 2 is the stress strain curve of acrylamide/nano-cellulose (NCC) plural gel prepared by the embodiment of the present invention 1.
Fig. 3 is the stress strain curve of acrylamide/nano-cellulose (CNF) plural gel prepared by the embodiment of the present invention 1.
Fig. 4 is the compression curve of acrylamide/nano-cellulose (NCC) plural gel prepared by the embodiment of the present invention 1
Fig. 5 is the compression curve of acrylamide/nano-cellulose (CNF) plural gel prepared by the embodiment of the present invention 1.
Fig. 6 is the enhancing mechanism schematic diagram of cellulose plural gel of the present invention.
Fig. 7 is that the elasticity modulus of acrylamide/nano-cellulose (NCC) plural gel prepared by the embodiment of the present invention 1 is bent
Line.
Fig. 8 is that the viscous modulus of the plain plural gel of acrylamide/nanofiber (NCC) prepared by the embodiment of the present invention 1 is bent
Line.
Fig. 9 is that the elasticity modulus of acrylamide/nano-cellulose (CNF) plural gel prepared by the embodiment of the present invention 1 is bent
Line.
Figure 10 is that the viscous modulus of the plain plural gel of acrylamide/nanofiber (CNF) prepared by the embodiment of the present invention 1 is bent
Line.
Specific embodiment
Experimental method used in following embodiments is conventional method unless otherwise specified.
The materials, reagents and the like used in the following examples is commercially available unless otherwise specified.
The specification of nano-cellulose used in following embodiments is as shown in table 1.
The specification of 1 nanofiber of table
The preparation of embodiment 1, acrylamide/nano-cellulose plural gel
Since nano-cellulose solid content is lower, nano-cellulose is handled by supercentrifuge first, is improved
To 6%, by treated, nano-cellulose is uniformly mixed its solid content with deionized water later, then carries out ultrasonic oscillation
Then acrylamide is added to the above suspension and continues to stir 2h by 20min, then by the N of 0.5% (mass fraction), N- is sub-
The potassium peroxydisulfate of bisacrylamide and 0.5% (mass fraction), which sequentially adds, to be continued to stir 30min in previous solution.This
Cross-linking system plastic 3h under 70 DEG C of constant temperature obtains polymer plural gel.
The specific formula of the plural gel of preparation is as shown in table 2.
2 acrylamides of table/nano-cellulose plural gel formula
Embodiment 2, acrylamide/nano-cellulose plural gel measuring mechanical property
1, scanning electron microscope
The section structure of gel sample is observed using scanning electron microscope (SEM) mode of Quanta 200F environmental scanning electronic microscope,
Will be dry after sample liquid nitrogen frozen, metal spraying is then observed.
The nano-cellulose that two kinds of specifications are observed by SEM, as shown in Figure 1, wherein Fig. 1 (a), Fig. 1 (b) and Fig. 1 (c) are
The SEM photograph of NCC, Fig. 1 (d), Fig. 1 (e) and Fig. 1 (f) are the SEM photograph of CNF, it can be seen from the figure that two kinds of specifications are received
Rice cellulose flocks together in irregular shape, it can be found that filiform is still presented in two kinds of celluloses after amplification,
And CNF is longer than NCC.Different length is also different for the reinforcing effect of plural gel.
Fig. 1 gives the blank acrylamide gel that solid content is 8% simultaneously, and (Fig. 1 (A), Fig. 1 (B), Fig. 1 (C), NCC are multiple
Close gel (mass ratio of Fig. 1 (D), Fig. 1 (E), Fig. 1 (F), acrylamide monomer and NCC are 6:2) and CNF plural gel
(the SEM photograph of (mass ratio of Fig. 1 (G), Fig. 1 (H), Fig. 1 (I), acrylamide monomer and CNF are 6:2).
It can be seen from the figure that three kinds of gels are all still that conventional porous network structure is presented, blank acrylamide is solidifying
Clearly grid and approximate circle porous structure is only presented in glue, and hole wall is relatively thin, and hole is micron order size, is distributed more equal
Even, duct is often connected with each other, and forms some disclosed channels；Porous network knot is equally presented in NCC plural gel substantially
Structure, but can significantly find out from figure after amplifying, there are tiny fiber filaments to be connected between hole and hole, fiber filament
About several nanometers of diameter, several hundred nanometers are long；The basic structure of CNF plural gel is with both the above gel, but in CNF plural gel
Hole configurations in and hole wall on it can be found that adhere to a large amount of elongate fiber filament, and obviously this fiber filament is far long
Fiber filament in NCC plural gel, and this is corresponding with the size of nano-cellulose.
From figure 1 it appears that the cellulose in plural gel is more in contrast to the SEM photograph of two kinds of celluloses itself
It is tiny, this is because not only having carried out sufficient stirring by blender in preparing gel process, also carried out by ultrasonic wave
Dispersion, in addition, the cellulose for shooting SEM is the purification sample after being centrifuged by supercentrifuge, so a large amount of fiber
Silk flocks together, and shows more thicker fiber morphology.
2, tensile property
Plural gel extension test uses the intensity of tensile stress of TA.XT Texture instrument test sample.Gel is mute in unification
Plastic in bell pattern tool, effective stretched portion length of gel sample are 2cm.Sample is placed on the fixture of Texture instrument, top
Fixture is pulled up with the speed of speed 3mm/s, and tensile stress-time graph is obtained in this drawing process.
Be illustrated in figure 2 tensile stress-time graph of NCC plural gel, Cong Tuzhong it can be found that plural gel drawing
It stretches stress to increase with the increase of stretching time, wherein the ratio of acrylamide monomer and NCC are 7:1,6:2 and 5:3
Plural gel shows fabulous tensile toughness, and until reaching TA.XT Texture instrument range, plural gel sample does not break
It splits, however the plural gel that the ratio of acrylamide monomer and NCC are 4:4 is broken very early；
The ratio of acrylamide monomer and NCC reach for the tensile stress of the plural gel of 5:3 and are up to 220g；Acryloyl
The plural gel tensile stress that the ratio of amine monomers and NCC are 6:2 is 183g；The ratio of acrylamide monomer and NCC are 7:1's
The tensile stress of plural gel is only 109g；And the plural gel that the ratio of acrylamide monomer and NCC are 4:4 is more early broken,
Only 87g.It can be seen that similar with microballoon plural gel, one timing of solid content plays certainly the mechanical strength of plural gel
Qualitative effect remains acrylamide monomer content, and when equal proportion, the humidification of NCC is slightly inferior to complex microsphere, but
It is that NCC is substantially better than complex microsphere to the toughness improvement of gel, this is mainly related to the morphosis of reinforcing agent itself,
Complex microsphere is flexible spheric granules, and NCC is filamental, the necessarily Filamentous improvement to toughness under equal conditions
It becomes apparent from.
Fig. 3 show tensile stress-time graph of CNF/ acrylamide plural gel, is different from NCC plural gel,
CNF plural gel is obvious more inferior in terms of toughness, but its reinforcing effect works as acrylamide better than hereinbefore all plural gels
When the ratio of monomer and CNF are 5:3, the tensile stress of plural gel is 319g, reaches maximum；When acrylamide monomer and CNF
Ratio when being 6:2, the tensile stress of plural gel is reduced to 280g, but stretching distance increases, and toughness slightly enhances；Work as acryloyl
When the ratio of amine monomers and CNF are 4:4, the tensile stress of plural gel is further reduced to 228g, and still, toughness is worst
, it is broken soon, it is seen then that when acrylamide content is too low, the network structure in plural gel is excessively loose；When
When the ratio of acrylamide monomer and CNF are 7:1, the tensile stress of plural gel is only 215g, its toughness is best at this time, is stretched
Distance is maximum.
3, compression performance
Plural gel compression verification uses the compressive strength of TA.XT Texture instrument test sample.Gel is in unified cylinder
In (15mm Ф × 15mm) mold after plastic, sample is placed in bottom compression plate center, top compression plate is 1mm with speed
S-1 is moved down, and show that compression stress presses force-strain curve in this compression process.Stress (σ) is by formula σ=Load/ π r2
It can be calculated, wherein r is sample not by initial radium when compressing.Strain (ε), be defined as in compression process sample by
The ratio of compression height and elemental height, in this test, strain is set as 95%, i.e. sample compression degree is elemental height
95%.
If Fig. 4 and Fig. 5 are respectively the compressive stress strain curve of NCC and CNF plural gel, comparison both it can be found that
The changing rule and tensile stress size of the two are all very close, and maximum compression stress is acrylamide monomer and cellulose
Ratio is the plural gel of 5:3, and maximum value is about 1600KPa, and the smallest be the ratio of acrylamide monomer and cellulose is 7:1
Plural gel, minimum are about 1300KPa.
Analyzing NCC and CNF enhances mechanism to the stretching of plural gel and compression performance, as shown in fig. 6, containing for cellulose
Measure certain plural gel, since cellulose total amount is consistent, so, no matter the length size of cellulosic monomer, compressing
When, total volume be it is of substantially equal, therefore, the compression performance of two kinds of plural gels is almost consistent；For tensile property, due to
CNF is longer than NCC, so, the tensile stress of CNF plural gel is maximum, and still, the CNF fiber filament long for one, toughness must
So lower than two even more short NCC fiber filaments are connected, and therefore, the toughness of NCC plural gel is splendid, not easy to break.
4, rheology testing
The rheological property of plural gel is by German HAKKE RS600 type rheometry.Sensor is several using PP20 board-to-board
What measurement system, plate spacing 1mm.Measurement sample is uniformly cut into ф 10mm × 3mm.Measurement is initially existed using stress concussion mode
Under 0~250Pa of the range of stress with frequency 1Hz scan sample linear viscoelasticity area, in this linear viscoelasticity area fixation answer
Power obtains the curve that the viscoplasticity of sample changes over time by test for 10Pa.Test carries out under the conditions of 30 DEG C.
Fig. 7 and Fig. 8 be respectively NCC plural gel elastic modulus G ' and viscous modulus G " with scan frequency f variation
Curve.It can be seen from the figure that the elastic modulus G ' and viscous modulus G " of NCC plural gel increase with the increase of scan frequency f
Add, wherein with stretch and compression performance is corresponding is the maximum gel sample for 5:3 of the elastic modulus G ' of plural gel, most
It can reach 4800Pa greatly, and the smallest gel sample for 7:1, minimum 1000Pa or so, it is notable that in high scanning
Under conditions of frequency, the elastic modulus G ' of plural gel is unstable, fluctuation occurs, analyzes the reason is that fiber filament is wound
Deng variation, internal networking structure is caused to be unevenly distributed.Meanwhile in NCC plural gel, the gel sample of 5:3 is also sticky mould
It is 850Pa, the gel sample of 4:4 and essentially coinciding for 5:3, and the gel sample greater than 7:1 of 6:2 that it is maximum, which to measure G ",.Together
Sample, at high frequencies, there is also viscous modulus G " is unstable, there is the phenomenon that fluctuates widely.
As shown in Figure 9 and Figure 10, the elastic modulus G ' of CNF plural gel and viscous modulus G " with scan frequency f increase
And increase and variation range it is wider, about in several hundred Pa.For elastic modulus G ', the ratio of acrylamide monomer and CNF are
The elastic modulus G ' of the plural gel of the plural gel and 4:4 of 5:3 is almost equal near high frequency, can reach 1000Pa when maximum
Left and right, in low frequency, the plural gel of 4:4 is higher than the plural gel of 5:3；Meanwhile the ratio of acrylamide monomer and CNF are
The bigger about ratio of the plural gel of 7:1 is 6:2's.For viscous modulus G ", there is a friendships for the plural gel of four kinds of ratios
Point, the low frequency range before 0.7Hz, the viscous modulus G " size order of the plural gel of different formulations are as follows: it is big that 4:4 is greater than 5:3
It is greater than 7:1 in 6:2, when high frequency region after 0.7Hz, viscous modulus G " size order and low frequency range are just the opposite.Analysis is former
Cause, when acrylamide monomer content is lower, plural gel microcosmos network structure is more loose, and intensity is weaker but viscosity is larger,
In low scan frequency, consume energy higher, so its viscous modulus G " is larger, conversely, in high frequency region, due to internal defect, institute
It is smaller to consume energy, that is, viscous modulus G " is smaller.
Claims (3)
1. a kind of acrylamide/nano-cellulose plural gel preparation method, includes the following steps:
Acrylamide, initiator and crosslinking agent are added into the suspension of nano-cellulose, obtains the acryloyl through plastic
Amine/nano-cellulose plural gel；
The nano-cellulose is Cellulose nanocrystal body or cellulose nanometer fibril, wherein the Cellulose nanocrystal body
Specification is as follows: a length of 20 ~ 500nm, and width is 4 ~ 5nm；The specification of the cellulose nanometer fibril is as follows: > 1 μm long, width 35nm；
The mass ratio of the acrylamide and the nano-cellulose is 5:3；
In cross-linking system, the mass concentration of the acrylamide is 4 ~ 7%；
The mass concentration of the nano-cellulose is 0.5 ~ 5%；
The cross-linking system is the mixed liquor of the nano-cellulose, the acrylamide, the initiator and the crosslinking agent；
The quality of the initiator is the 0.3 ~ 0.8% of the gross mass of the acrylamide and the nano-cellulose；
The quality of the crosslinking agent is the 0.3 ~ 0.8% of the gross mass of the acrylamide and the nano-cellulose；
The initiator and the crosslinking agent are added in the form of its solution；
The condition of the plastic is as follows:
Temperature is 60 ~ 80 DEG C；
Time is 2 ~ 4 hours.
2. acrylamide/nano-cellulose plural gel of claim 1 the method preparation.
3. acrylamide described in claim 1/nano-cellulose plural gel is as the application in gel valve.
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| Title |
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| Application of rod-shaped cellulose nanocrystals in polyacrylamide hydrogels;Chengjun Zhou etal.;《Journal of Colloid and Interface Science》;20110101;第353卷(第1期);第117页2.2制备部分、第121页2.1压缩强度部分 * |
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| CN107828069A (en) | 2018-03-23 |
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