CN102633955A - Anti-shearing polymer and preparation method thereof - Google Patents
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Abstract
The invention relates to an anti-shearing polymer and a preparation method thereof. The polymer is a copolymer composed of acrylic amide, sodium acrylate, hydrophobic monomer dimethyl allyl-N-alkyl ammonium chloride and a functionalized framework monomer. The average molecular weight of the copolymer is 6 million. The preparation method comprises the following steps of: (1) respectively dissolving a polyamide-amide macromolecular framework monomer and maleic anhydride (or acryloyl chloride and acrylic anhydride) into dimethyl sulfoxide; slowly dropwise adding a framework monomer solution into a maleic anhydride solution; introducing nitrogen and placing the system into an ice salt bath; when the pH (Potential of Hydrogen) value of a reaction solution is 4-5, stopping dropwise adding the framework monomer solution; and utilizing chloroform to repeatedly precipitate to obtain the functionalized framework monomer; and (2) carrying out free radical water solution polymerization on the acrylic amide, acrylic acid, the hydrophobic monomer and the functionalized framework monomer. The anti-shearing polymer and the preparation method thereof have the advantages of reliable principle and convenience for operation; and the synthesized polymer still has good tackifying capability under high-temperature, high-salinity and strong shearing effects.
Description
Technical field
The present invention relates to a kind of anti-shearing polymkeric substance and preparation method thereof, belong to polymeric material field.
Background technology
Technique of polymer flooding is the major technique means that China's oil-field development improves oil recovery factor; And all obtained certain success technically and economically; Obtained in the polymer displacement of reservoir oil tech TOR at home and abroad using widely, had broad application prospects.Along with the further exploitation of the national economic development and hydrocarbon resources, require more and more urgent to improving RF.
In order to improve the polymer flooding effect and to satisfy abominable day by day reservoir condition requirement, the stability of water-soluble polymers is had higher requirement, as have higher glutinous ability and the stability of increasing.Stability mainly comprises shear stability, chemicalstability, thermostability, biologically stable and long-acting stability etc.Particularly, under the influence of high temperature, high salinity, the anti-shear performance of water-soluble polymers significantly descends, and is the main problem that present polymer oil-displacing agent faces.Research shows that polyacrylamide solution is 66.7s in shearing rate
-1Viscosity loss behind the continuous down shearing 2min is up to more than 90%; And viscosity can not be recovered; Had a strong impact on measure effect (Lei Qiaohui; Tian Genlin, Zheng Dewen etc. polymer viscosity slitter loss and Study of Recovery [J]. Xi'an shiyou University's journal (natural science edition) .1997,12 (06): 36-38).
As far back as 1986, the people such as Ryles of U.S. Cyanamid company just developed the water-soluble polymers of high-molecular weight partially hydrolyzed polyacrylamide as mobility control and profile control.In order to adapt to high temperature, high salinity; The higher reservoir condition of divalent ion content particularly; Improve the long-term thermal stability and the shear-stable ability of partially hydrolyzed polyacrylamide solution; The researchist constantly pursues the partially hydrolyzed polyacrylamide of HMW and ultra-high molecular weight, develops relative molecular mass at present up to 200～300 * 10
6HPAM, and just towards the target struggle that produces high molecular weight HPAM more (Qi Jinli. Sa Nan oil field high concentration polymer drives scheme optimization and effect assessment [D]. Beijing: The Chinese Geology Univ. (Beijing), 2010).Simultaneously; The researchist introduces on polymer molecular chain has special interactional group (like Ionomer, association polymer etc.); Rely on to strengthen intramolecularly or the intermolecular reactive force (electrostatic force, hydrophobic association power etc.) of polymer molecule in the aqueous solution, improve heatproof, salt tolerant and anti-shear performance (He Jing, the Wang Manxue of polymkeric substance; Wu Jinqiao etc. the Study on influencing factors of viscosity of hydrophobic associated polymer solution [J]. oilfield chemistry .2011,28 (03): 259-262.); Wherein hydrophobic association polyacrylamide is on the polymer macromolecule chain, to introduce a small amount of hydrophobic grouping; Thereby polymer molecule is in the aqueous solution; Form network solution structure with certain intensity and reversible physics " crosslinked " by the hydrophobic association effect; Improve tackifying, salt tolerance and the shear resistant of polymers soln, had application promise in clinical practice.But receive property injected and solubility property requirement, the hydrophobic grouping content on the hydrophobic associated polymer molecular chain is lower; In order effectively to improve the tackifying ability of polymers soln, improve the hydrophobic associated polymer molecular weight through several different methods and means, realize improving the solvability and the tackifying ability of hydrophobic associated polymer.
But in polymers soln preparation and injection process; Polymers soln all can suffer mechanical shearing from ground to subterranean whole process, promptly the process at preparation (whisking appliance), transportation (pipeline member, pump, valve), injection (sleeve pipe borehole) and the pore media of flowing through all shear degradation can take place.Particularly, in the immediate vicinity of wellbore, because the flow velocity of polymers soln is very fast, its shear rate that receives is particularly for serious.Its shearing action mainly is the length that has reduced polymer molecular chain; Cause polymer solution viscosity decline (Ye Zhongbin; Peng Yang, Shi Leiting etc. the porous medium shearing action is to the influence [J] of polymers soln visco-elasticity and oil displacement efficiency. oil-gas geology and RF .2008,15 (5): 59-62).The Daqing oil field mining site is used monitoring result and is shown; From being formulated into the recovery well that injects the well well head, injects well 106m apart from the monitor well that injects well 30m, distance; Viscosity loss is respectively 10%, 30%, 70%; Polymers soln plays the displacement effect in oil reservoir virtual viscosity be merely preparation viscosity about 1/3 (Zhang Zhen China etc. the on-the-spot pilot test technology of polymer flooding [M]. Beijing: petroleum industry press, 1996:207); The mining site experiment of Shengli Oil Field shows: the viscosity that the preparation of polymers soln, injection well well head, injection well return row and the sampling of detection well is respectively 12.3mPas, 7.7mPas, 4.4mPas and 4.1mPas; Viscosity total losses 66.7% (Wang Youqi; Zhang Yigen. impact polymer drives several problems [J] of mining site implementation result. oilfield chemistry; 1999,16 (3): 244～246); North China Oilfield is injected flow process at the research polymkeric substance polymer performance influence test is found; The pit shaft perf is the most serious to the shearing of polymers soln; The viscosity loss rate is up to 42.3% (Geng Yuguang; Li Shanwei etc. the guiding experimental study of North China Oilfield TOR [J]. drilling technology, 1998,21 (5): 26～29); Bohai SZ 36-1 returns in the oil field row's sampling result and shows: the polymer solution viscosity rate of loss is greater than 80% (Zhang Xiansong; The Sun Fu street, Feng Guozhi, Yang Junru. testing in Bohai heavy oil fields research on influence factors of polymer flooding and test in place [J]. Chinese offshore oil and gas; 2007,19 (1): 30～34).Because viscosity loss causes polymer flooding efficient to reduce, and has seriously influenced the polymer flooding effect.
There is following problem in the high temperature and high salinity reservoir polymer when driving: (1) is because the electrostatic shielding effect between positively charged ion; Positively charged ion can attract each other with the negative charge on the polymer molecule; Thereby make polymer molecule become uncharged molecule and take place Texturized; Hydrodynamic radius reduces, the tackifying variation; (2) divalent cation (Ca
2+, Mg
2+) with polymer molecular chain on-COO-group generation complexing forms indissoluble thing or insolubles, thereby the viscosity of polymers soln significantly reduced; Synergy between calcium and mg ion can be than bigger to the influence of polymers soln with the simple salt condition of concentration, and viscosity reduces more; (3) positively charged ion and polymer molecular chain effect cause polymerizable molecular chain rigidity variation, and the probability that polymer molecule is sheared degraded under high speed shear increases greatly, makes the shear resistant variation of polymkeric substance.
Hyperbranched polymer is through branching primitive one type of macromole with highly branched structure obtaining of multiple reaction progressively, is a youth and fast-developing field is one type of new polymkeric substance with special property that emerges in the macromolecular science.Different with traditional simple linear polymer or star-type polymer; Hyperbranched macromolecular has character (K.|shizu such as three-dimensional structure and a large amount of end group and high resolution, rigid structure, extensive chemical reactive behavior; D.Takahashi; H.Takeda.Novel synthesis and characterzation of hyperbranched polymers [J] .Polymer.2000,41 (16): 6081-6086).Because the special construction character of hyperbranched macromolecular is with a wide range of applications in catalysis, medical science, nano composite material, separatory membrane and sewage-treating agent, transmitter, material modification and other material functional field.Exist substantial connection between polymer performance and the structure (short-range structure of macromolecular chain, long-range structure, high molecular aggregated structure), can change the macro property of polymkeric substance through adjustment and control texture effectively; Utilize the characteristic of hyperbranched macromolecular,, help to improve the shear resistant problem of polymkeric substance in conjunction with the thickening property of linear polymer.
The compound method of hyperbranched polymer has many, according to monomer type, mainly can be divided into two big types.One type is that (single-monomer methodology SMM), mainly is to utilize AB to the monounsaturated monomer method
nType or potential AB
nThe type monomer carries out polymerization; Another kind of is that (double-monomer methodology, DMM), this method need be with two kinds of monomers or a pair of monomer to carrying out polymerization for two simplex methods.Selecting commercial AB type monomer (methyl acrylate) and Cn type monomer (quadrol) is raw material, and the process of synthesizing water-solubility over-branched polyamidoamine is simplified, and cost is lower, and can change the structure and the performance of over-branched polyamidoamine easily.(Gao; C.and Yan; D.Y.Hyperbranched polymers:From synthesis to applications [J] .Prog.Polym.Sci., 2004,29; 183-275., Liu Cuihua. [D] studied in the encapsulation of synthetic and supramolecule and the supramolecule self-assembly of hyperbranched polymer. Shanghai: Shanghai Communications University, 2007).Because the inside and the end group of hyper-branched polymer contain a large amount of reactive groups; Can utilize functional end-group; " functional " small molecules is connected the terminal of hyperbranched polymer or is other polymkeric substance of nuclear medium with the hyperbranched macromolecular; Formation have certain function branched polymer material (superb. the molecular designing of hyperbranched polymer, synthetic, sign and functionalization research [D]. Shanghai: Shanghai Communications University, 2001).
In order to improve the ability that polymkeric substance adapts to more and more abominable reservoir media; Need carry out Molecular Structure Design through the constructional feature of combination over-expense polymkeric substance and the tackify characteristic of linear molecule; Be intended to change the polymer viscosified mode; Improve the polymer molecule inflexible and reduce polymkeric substance unit molecule hydrodynamic radius simultaneously, realize that polymkeric substance has good tackifying ability in high salinity solution, reach the purpose that in oil reservoir, has better anti-shear performance and higher mobility control ability.
Summary of the invention
The object of the present invention is to provide a kind of anti-shearing polymkeric substance; This polymkeric substance is formed by acrylic amide, vinylformic acid, hydrophobic monomer and functionalization skeleton monomer copolymerization, and under high temperature, high salinity environment, this polymkeric substance utilizes the chain rigidity of molecular skeleton; Strengthen molecular chain interphase interaction and the length that suitably reduces the flexible molecule chain; Improve the anti-shear ability of polymer molecular chain, and relied on intermolecular mutual association, improved the polymers soln tackifying ability.
Another object of the present invention also is to provide the preparation method of this anti-shearing polymkeric substance; This preparation method is that acrylic amide, vinylformic acid, hydrophobic monomer and functionalization skeleton monomer pass through free yl solution polymerization; Principle is reliable; Easy and simple to handle, the synthetic polymkeric substance still has good tackifying ability under high temperature, high salinity and intensive shearing action.
For reaching above technical purpose, the present invention provides following technical scheme.
Relatively poor to polymkeric substance anti-shear ability under high temperature, high salinity condition; From the polymer molecular structure design; Characteristics in conjunction with heatproof, salt tolerant ultra-high molecular weight line style partially hydrolyzed polyacrylamide, comb-shaped polymer and hydrophobic associated polymer; Utilize the chain rigidity of polymer molecule skeleton; Strengthening the length that the polymer molecular chain interphase interaction suitably reduces the flexible molecule chain simultaneously, shearing action reduces the probability of polymericular weight in the minimizing polymer flooding process, improves the anti-shear ability of polymer molecular chain.
The daiamid macromole be a kind of skeleton monomer with dissaving structure (Liu Cuihua. the synthetic and supramolecule encapsulation of hyperbranched polymer is studied [D] with the supramolecule self-assembly. Shanghai: Shanghai Communications University; 2007), its over-branched polyamidoamine macromole is as shown in the figure:
This daiamid macromolecular skeleton monomer is carried out functionalization form functionalization skeleton monomer; Said functionalization is exactly that skeleton monomer and functionalized reagent react; Carry out the two keys of next step polymeric thereby form to have, can under mild conditions, can react with acrylic amide, vinylformic acid and hydrophobic monomer.Said functionalized reagent is MALEIC ANHYDRIDE, acrylate chloride or acrylic anhydride.Daiamid macromole reaction kinetic formula is following:
With the macromolecular functionalization skeleton of above-mentioned daiamid monomer brief note be: C
127H
202O
46N
36
Said hydrophobic monomer is dimethyl-allyl-N-alkyl ammomium chloride, and its molecular structure is following:
A kind of anti-shearing polymkeric substance of the present invention is acrylic amide (C
3H
5ON), sodium acrylate (C
3H
3O
2Na), hydrophobic monomer dimethyl-allyl-N-alkyl ammomium chloride (C
N+5H
2n+12NCl) and functionalization skeleton monomer (C
12/H
202O
46N
36) multipolymer, structural formula is following:
Wherein n is 14～18, structural unit percentage ratio * and be 45%～75%, y is 20%～50%, z is 1%～4%.The molecular-weight average of this multipolymer is 6,000,000.
A kind of preparation method of anti-shearing polymkeric substance may further comprise the steps successively:
(1) taking by weighing daiamid macromolecular skeleton monomer 3.25 grams joins respectively in the different beakers with MALEIC ANHYDRIDE 2 grams (perhaps acrylate chloride, acrylic anhydride); It is even that the methyl-sulphoxide that adds 20 grams and 10 grams then respectively carries out stirring and dissolving, and the monomeric dimethyl sulfoxide solution of skeleton slowly is added drop-wise in the dimethyl sulfoxide solution of MALEIC ANHYDRIDE, in the dropping process, leads to nitrogen; And place cryosel to bathe the system; With pH value monitoring reaction process, when reacting liquid pH value is 4～5, stop to drip the skeleton monomer solution; Till continuing to be stirred to reaction solution system temperature and no longer raising, obtain functionalization skeleton monomer with the chloroform repeated precipitation.
(2) acrylic amide, vinylformic acid, hydrophobic monomer and functionalization skeleton monomer are carried out the free yl solution polymerization reaction; Each constituent mass per-cent is: acrylic amide 50.1-78.9%, vinylformic acid 20.0-44.8%, hydrophobic monomer 1.0-5.09% and functionalization skeleton monomer 0.009-0.30%; Join it in the reaction vessel; And to be made into the monomer total mass concentration be 28% the aqueous solution, uses Na
2CO
3, NaHCO
3, alkaline matters such as NaOH, KOH adjust to 6-7 with pH value of solution, add solubility promoter, chain-transfer agent and redox initiator after feeding nitrogen deoxygenation 30min, in 15-45 ℃ of water bath with thermostatic control placing response 4-8 hour, make the anti-shearing polymkeric substance of the present invention.
The said solubility promoter of preparing method's step of the present invention (2) is urea, thiocarbamide or small molecules sodium salt, can promote the dissolving of materials such as hydrophobic monomer, and its consumption is 0.5～3% of a monomer total mass; Said chain-transfer agent is sodium methylate, Virahol, methylamine or N, and N '-Tetramethyl Ethylene Diamine, its consumption are 0.015～0.4% of monomer total mass, adjustable polymkeric substance relative molecular mass; The oxygenant of said redox initiator is Potassium Persulphate, ammonium persulphate, Sodium Persulfate or ydrogen peroxide 50, and reductive agent is S-WAT or sodium sulfite anhy 96, and its dosage is the 0.003-0.1% of monomer total mass.
Compared with prior art, the anti-shearing polymkeric substance of synthetic of the present invention has following characteristics:
(1) anti-shearing polymkeric substance of the present invention has higher tackifying ability, and good solubility and heat-resistant salt-resistant ability, in porous medium, has good injectability and mobility control ability.
(2) the present invention adopts the skeleton monomer with degree of branching, has strengthened the chain rigidity of polymkeric substance, has improved the anti-shear ability of polymkeric substance.
(3) cation hydrophobic monomer of the present invention's employing links to each other with main polymer chain, forms the flexible molecule with hydrophobic association effect at solution, has greatly improved the tackifying ability of rigid polymer, and heatproof and saline-alkaline tolerance.
(4) the anti-shearing polymkeric substance of preparation shows higher tackifying ability under the high salinity condition, as being in the 10069.8mg/L aqueous solution in total mineralization, and CaCl
2Mass concentration 1579.0mg/L, MgCl
2Mass concentration 1626.9mg/L, mass concentration is that the polymers soln AV of 1750mg/L reaches 176mPas, shearing the back soltion viscosity through 1 grade of 20S of WARNlG whisking appliance is 128mPas, shows good anti-shear performance and anti-calcium, mg ion ability.
(5) the anti-shearing polymkeric substance of preparation can be used as high temperature, high salinity reservoir polymer oil-displacing agent; It sets up higher residual resistance factor ability, makes it permeate the auxiliary agent that the oil field flood effectiveness is used as the adjustment height.
(6) easy and simple to handle, the mild condition of preparation method.
Description of drawings
Fig. 1 is the different anti-shearing polymer solution viscosity and the relation curve of concentration.
Fig. 2 is the relation curve of anti-shearing polymkeric substance HPED04 solution (concentration is 1750mg/L) viscosity and temperature.
Fig. 3 is the relation curve of anti-shearing polymkeric substance HPED04 solution (concentration is 1750mg/L) viscosity and salinity.
Fig. 4 is the flow curve of anti-shearing polymkeric substance HPED04 solution (concentration is 1750mg/L).
Fig. 5 is an anti-shearing polymkeric substance HPED04 solution (concentration is 1750mg/L) in rate of permeation is the seepage flow characteristic curve in the porous medium of 2196mD.
Embodiment
Further specify the present invention through embodiment below.
One, the preparation of anti-shearing polymkeric substance
Taking by weighing skeleton monomer 3.25 grams joins respectively in the different beakers with MALEIC ANHYDRIDE 2 grams; It is even that the methyl-sulphoxide that adds 20 grams and 10 grams then respectively carries out stirring and dissolving, and the monomeric dimethyl sulfoxide solution of skeleton slowly is added drop-wise in the dimethyl sulfoxide solution of MALEIC ANHYDRIDE, in the dropping process, leads to nitrogen; And place cryosel to bathe the system; With pH value monitoring reaction process, when reacting liquid pH value is 4～5, stop to drip the skeleton monomer solution; Till continuing to be stirred to reaction solution system temperature and no longer raising, obtain functionalization skeleton monomer with the chloroform repeated precipitation.
Take by weighing acrylic amide (AM) 20 grams, vinylformic acid (AA) 6 grams, functionalization skeleton monomer 0.0026 gram, 0.0052 gram, 0.013 gram, 0.026 gram, 0.052 gram, 0.078 gram; Dimethyl-allyl octadecyl ammonium chloride 0.4 gram; Zero(ppm) water 74 grams join respectively in the beaker, and stirring and dissolving are evenly; Sodium hydroxide arrives 6-7 with pH regulator; Preheating added each 0.26 gram of solubility promoter urea and sodium sulfate, chain-transfer agent sodium methylate 0.052 gram, each 4.8 milligrams of redox initiator sodium sulfite anhy 96 and ammonium persulphates after 30 minutes in temperature is 40 ℃ of water-baths; Reacted 6 hours, and obtained to be numbered six kinds of frozen glue shaped polymers of HPED01, HPED02, HPED03, HPED04, HPED05, HPED06 respectively.
Embodiment 2
Like embodiment 1 preparation functionalization skeleton monomer.
Take by weighing acrylic amide (AM) 20 grams, vinylformic acid (AA) 6 grams, functionalization skeleton monomer 0.026 gram; Dimethyl-allyl octadecyl ammonium chloride 0.4 gram, 0.8 gram, 1.2 grams, zero(ppm) water 74 grams join in the beaker respectively; Stirring and dissolving are evenly arrived 6-7 with sodium hydroxide with pH regulator, and preheating is after 30 minutes in temperature is 40 ℃ of water-baths; Add each 0.26 gram of solubility promoter urea and sodium sulfate, chain-transfer agent sodium methylate 0.052 gram; Each 4.8 milligrams of redox initiator sodium sulfite anhy 96 and ammonium persulphates reacted 6 hours, obtained three kinds of frozen glue shaped polymers.
Two, anti-shearing polymer properties test
Get certain amount of H PED01～HPED06, under 40 ℃ of water bath condition, (ion is formed (mg/L of unit): Na to use salinity to inject water as the 9374.12mg/L simulation
++ K
+3091.96, Ca
2+276.17, Mg
2+158.68, CO
3 2-14.21, HCO
3 -311.48, SO
4 2-85.29, Cl
-5436.34), be mixed with the solution that concentration is 5000mg/L, place leave standstill 12 hours in the Brown Glass Brown glass bottles and jars only after; Be diluted to aimed concn, the back that stirs is placed in the Brown Glass Brown glass bottles and jars only and was left standstill 8 hours, uses anti-shearing polymers soln as the displacement of reservoir oil.The sticking dense relation of HPED01～HPED06 is seen Fig. 1.
Getting aimed concn is the HPED04 polymers soln of 1750mg/L, shears 20s for 1 grade with the WARlNG whisking appliance, measures its AV before and after the polymer solution shear under condition of different temperatures, sees Fig. 2.Be under 65 ℃ the condition in temperature, measure its flow curve, see Fig. 3.Measure its sticking dense relation under different salinity (10000mg/L sodium-chlor, 8000mg/L sodium-chlor+2000mg/L calcium chloride and 8000mg/L sodium-chlor+1684.6mg/L magnesium chloride), see Fig. 4.
Get certain amount of H PED04; Inject the solution that water is mixed with 5000mg/L with simulation, use simulation to inject water again and be diluted to the solution of concentration, in 65 ℃ of thermostat containers, polymers soln is injected into long 50.0cm with 1.0ml/min speed as 1750mg/L; Have in the sand-packed model of pressure tap in the middle of the diameter 0.8cm; The injection property of polymers soln when the investigation rate of permeation is 2196mD, and the ability of setting up RF and residual resistance factor are seen Fig. 5.Experimental result shows; The HPED04 solution of 1750mg/L shows good injection property in higher infiltration porous medium; The RF of in porous medium, setting up is 174.6; Residual resistance factor is 47.2, explains that it has good mobility control ability and the ability that reduces water phase permeability in most permeable medium.
Claims (4)
1. an anti-shearing polymkeric substance is acrylic amide (C
3H
5ON), sodium acrylate (C
3H
3O
2Na), dimethyl-allyl-N-alkyl ammomium chloride (C
N+5H
2n+12NCl) and functionalization skeleton monomer (C
12/ H
202O
46N
36) multipolymer, structural formula is following:
Wherein n is 14～18, * be 45%～75%, y is 20%～50%, z is 1%～4%.
2. anti-shearing polymkeric substance as claimed in claim 1 is characterized in that, said functionalization skeleton monomer is that daiamid macromolecular skeleton monomer and MALEIC ANHYDRIDE, acrylate chloride or acrylic anhydride react in dimethyl sulfoxide solution and form.
3. the preparation method of anti-shearing polymkeric substance as claimed in claim 1 may further comprise the steps successively:
(1) daiamid macromolecular skeleton monomer 3.25 grams and MALEIC ANHYDRIDE (perhaps acrylate chloride, acrylic anhydride) 2 grams are dissolved in respectively in the methyl-sulphoxide of 20 grams and 10 grams; The skeleton monomer solution slowly is added drop-wise in the maleic acid anhydride solution, in the dropping process, leads to nitrogen, and place cryosel to bathe system; When reacting liquid pH value is 4～5; Stop to drip, till continuing to be stirred to reaction solution system temperature and no longer raising, obtain functionalization skeleton monomer with the chloroform repeated precipitation;
(2) acrylic amide, vinylformic acid, dimethyl-allyl N alkyl ammomium chloride and functionalization skeleton monomer are carried out the free yl solution polymerization reaction; Each constituent mass per-cent is: acrylic amide 50.1-78.9%, vinylformic acid 20.0-44.8%, dimethyl-allyl-N-alkyl ammomium chloride 1.0-5.09% and functionalization skeleton monomer 0.009-0.30%; Join it in the reaction vessel; And to be made into the monomer total mass concentration be 28% the aqueous solution; PH value of solution is adjusted to 6-7; Add solubility promoter, chain-transfer agent and redox initiator after feeding nitrogen deoxygenation 30min, in 15-45 ℃ of water bath with thermostatic control placing response 4-8 hour, make the anti-shearing polymkeric substance of the present invention.
4. preparation method as claimed in claim 3; It is characterized in that; Said solubility promoter is urea, thiocarbamide or small molecules sodium salt, and said chain-transfer agent is sodium methylate, Virahol, methylamine or N, N '-Tetramethyl Ethylene Diamine; The oxygenant of said oxidation-reduction initiator is Potassium Persulphate, ammonium persulphate, Sodium Persulfate or ydrogen peroxide 50, and reductive agent is S-WAT or sodium sulfite anhy 96.
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| CN102965094B (en) * | 2012-11-18 | 2015-04-22 | 西南石油大学 | Dendronized polymer/SiO2 nano oil-displacing agent and method for preparing same |
| CN102965094A (en) * | 2012-11-18 | 2013-03-13 | 西南石油大学 | Dendronized polymer/SiO2 nano oil-displacing agent and method for preparing same |
| CN103130967A (en) * | 2013-02-28 | 2013-06-05 | 西南石油大学 | Hyperbranched hydrophobical-associating water-soluble polymer and its preparation method |
| CN103555305A (en) * | 2013-10-31 | 2014-02-05 | 西南石油大学 | Hyperbranched slow-swelling profile control particles and preparation method thereof |
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| CN111834595A (en) * | 2019-04-16 | 2020-10-27 | 住友化学株式会社 | Porous layer for nonaqueous electrolyte secondary battery |
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