CN104448121B - A kind of polyacrylamide and preparation method thereof - Google Patents
A kind of polyacrylamide and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of polyacrylamide and preparation method thereof, the method includes: (1) preparation acrylamide and temperature-resistant anti-salt monomer solution, regulates pH to 5 10 with inorganic alkaline compound；(2) in acrylamide and temperature-resistant anti-salt monomer solution, molecular weight regulator is added；(3) under the conditions of aqueous solution polymerization, under inert gas shielding, initiator system is contacted with acrylamide and temperature-resistant anti-salt monomer solution, obtains polymer gel.(4) polymer gel is carried out a pelletize, hydrolysis, secondary granulation, is dried, pulverizes and sieves.In the present invention, molecular weight of copolymer (800 1,000 ten thousand) can be controlled by molecular weight regulator；And this polyacrylamide has good Efficient Adhesive Promotion under high temperature and high ore deposit degree, petrochemical industry can be used for, especially as middle hyposmosis (permeability 20 100 × 10 by wide model‑3um2) high temperature and high salt oil deposit Flooding Agent for EOR.
Description
Technical field
The present invention relates to a kind of temperature-resistant anti-salt water-soluble polymer and preparation method thereof, particularly relate to one
Middle low-molecular-weight temperature-tolerant anti-salt polyacrylamide and preparation method thereof.
Background technology
With Daqing oil field and Shengli Oil Field as representative, high molecular weight moieties hydrolyzed polyacrylamide (HPAM)
In conventional oil reservoir tertiary oil recovery (EOB) technology, large-scale promotion and application are obtained.Along with being suitable for
The minimizing of chemical flooding high-quality resource, chemical flooding technology develops to high temperature and high salt oil deposit and low-permeability oil deposit.Example
Ratio as in recent years, in the petroleum-in-place that Sinopec is newly verified, shared by low-permeability oil deposit reserves
Example is up to 60%-70%, and low-permeability oil deposit will be the main money produced in a most considerably long increasing the storage in period
Basis, source.
Therefore, how improving and improve the exploitation effect of low permeability oil field is problem demanding prompt solution.
In routine, the HPAM of low-molecular-weight is not suitable for high temperature and high salt middle and low permeable reservoir tertiary oil recovery, main
Being embodied in two aspects, one is out that high temperature and high salt makes solution viscosity reduce, and improves water oil mobility accordingly
The ability of ratio dies down, and causes HPAM oil displacement efficiency the most notable.Additionally, at high temperature, in air oxygen and
When solution exists dissolved oxygen, main polymer chain fracture also can be caused to make solution viscosity be remarkably decreased.Two are
The shearing force of middle and low permeable reservoir near wellbore also can cause shear degradation serious for HPAM.
Middle and low permeable reservoir permeability is low, has Molecular Weight for Polyacrylamide and is more strict with.Develop resistance to
The anti-salt of temperature, the temperature-tolerant anti-salt polyacrylamide with suitable molecular weight is to improve low permeability pay recovery ratio
One of important channel.
Summary of the invention
The invention aims to overcome the Molecular Weight for Polyacrylamide of prior art to be not suitable for high temperature high
The defect of salt middle and low permeable reservoir tertiary oil recovery, it is provided that low-molecular-weight (800-1000 ten thousand) heatproof in one
Anti-salt polyacrylamide and preparation method thereof.
The invention provides the preparation method of a kind of polyacrylamide, its preparation method comprises the following steps:
(1) preparation acrylamide and temperature-resistant anti-salt monomer solution, regulate pH with inorganic alkaline compound
To 5-10, obtain acrylamide/temperature-resistant anti-salt monomer solution；
(2) acrylamide obtained in step (1)/temperature-resistant anti-salt monomer solution adds molecule
Amount regulator；
(3) under the conditions of aqueous solution polymerization, under inert gas shielding, by initiator system and step (2)
The acrylamide of middle addition molecular weight regulator/temperature-resistant anti-salt monomer solution contact, obtains polymer and coagulates
Glue；
(4) polymer gel obtained in step (3) is carried out a pelletize, hydrolysis, secondary granulation,
It is dried, pulverizes and sieves.
The temperature-resistant anti-salt monomer that the present invention uses has the water solublity of excellence, temperature-resistant anti-salt performance and polymerization and lives
Property.Molecular weight of copolymer (800-1000 ten thousand), the present invention can be accurately controlled by molecular weight regulator
The middle low-molecular-weight temperature-tolerant anti-salt polyacrylamide prepared has well under high temperature and high ore deposit degree
Efficient Adhesive Promotion, can be used for petrochemical industry, especially as middle hyposmosis (permeability 20-100 by wide model
×10-3um2) high temperature and high salt oil deposit Flooding Agent for EOR.
Detailed description of the invention
Hereinafter the detailed description of the invention of the present invention is described in detail.It should be appreciated that this place is retouched
The detailed description of the invention stated is merely to illustrate and explains the present invention, is not limited to the present invention.
According to the invention provides the preparation method of a kind of polyacrylamide, its preparation method includes following step
Rapid:
(1) preparation acrylamide and temperature-resistant anti-salt monomer solution, regulate pH with inorganic alkaline compound
To 5-10, obtain acrylamide/temperature-resistant anti-salt monomer solution；
(2) acrylamide obtained in step (1)/temperature-resistant anti-salt monomer solution adds molecule
Amount regulator；
(3) under the conditions of aqueous solution polymerization, under inert gas shielding, by initiator system and step (2)
The acrylamide of middle addition molecular weight regulator/temperature-resistant anti-salt monomer solution contact, obtains polymer and coagulates
Glue；
(4) polymer gel obtained in step (3) is carried out a pelletize, hydrolysis, secondary granulation,
It is dried, pulverizes and sieves.
According to the present invention, in step (1), described comonomer acrylamide can be acrylic acid,
2-acrylamide-2-methylpro panesulfonic acid, N, N-DMAA, N, N-acrylamide,
Vinyl pyrrolidone, 2-acrylamido dodecane sulfonic acid, 2-acrylamido tetradecane sulfonic acid and 2-
One or more in acrylamido cetyl sulfonic acid.
According to the present invention, inorganic alkaline compound described in step (1) is used for regulating acrylamide and resistance to
The pH value of the anti-salt monomer I aqueous solution of temperature.Described inorganic alkaline compound can be sodium hydroxide, hydrogen-oxygen
Change one or more in potassium and sodium carbonate, it is preferable that described inorganic alkaline compound is sodium hydroxide.
According to the present invention, molecular weight regulator described in step (2) can think Isosorbide-5-Nitrae-hydroquinone,
One in MEHQ, thiourea, 2-methyl-2-propylene-1-sulfonic acid and hydrazine hydrate or
Multiple.
According to the present invention, described in step (3), initiator system includes water-soluble azo series initiators, amine
Class reduction auxiliary agent, sulfite reducing agent and oxidant.Described water-soluble azo series initiators, amine are also
The content of former auxiliary agent, sulfite reducing agent and oxidant can require to carry out suitably according to concrete use
Ground selects.
According to the present invention, on the basis of 100 parts by weight propylene amide and temperature-resistant anti-salt monomer solution, point
Son amount regulator can be 0.01-1 weight portion, preferably 0.01-0.1 weight portion；Water-soluble azo system draws
The consumption sending out agent can be 0.001-0.1 weight portion, preferably 0.005-0.05 weight portion；Amine reduction helps
The consumption of agent can be 0.001-0.1 weight portion, preferably 0.005-0.05 weight portion；Sulphite reduces
The consumption of agent can be 0.001-0.1 weight portion, preferably 0.005-0.05 weight portion；The consumption of oxidant
For 0.001-0.1 weight portion, preferably 0.005-0.05 weight portion.
According to the present invention, described water-soluble azo series initiators can be 2,2 '-azo (2-amidine propane) two
In hydrochlorate, 2,2 '-azo (2-imidazoline propane) dihydrochloride and 4,4 '-azo double (4-cyanopentanoic acid) one
Plant or multiple, preferably 2,2 '-azo (2-amidine propane) dihydrochloride.
According to the present invention, described sulfite reducing agent can be ammonium sulfite, potassium sulfite, sulfurous acid
One or more in sodium, ammonium bisulfite, Potassium acid sulfite and sodium sulfite, preferably sulfurous acid
Hydrogen sodium.
According to the present invention, described oxidant can be in Ammonium persulfate., sodium peroxydisulfate, potassium peroxydisulfate
Plant or multiple, preferably Ammonium persulfate..
According to the present invention, described amine reduction auxiliary agent can be N, N-dimethylethanolamine, N, N-diformazan
Base piperazine, tetramethylurea element, N, N, N ', one or more in N '-tetramethylethylenediamine, it is preferably
N, N, N ', N '-tetramethylethylenediamine.
According to the present invention, the present invention does not has particular/special requirement to aqueous solution polymerization condition, is referred to existing skill
Art is carried out, it is preferable that described aqueous solution polymerization condition includes: temperature can be 0 DEG C to 20 DEG C, preferably
It it is 5 DEG C to 15 DEG C；Time can be 2-12 hour, preferably 4-8 hour.
According to the present invention, the present invention does not has particular/special requirement to concentration of aqueous solution, it is preferable that acrylamide and
The total concentration of temperature-resistant anti-salt monomer can be 15-40 weight %, preferably 20-30 weight %；Acrylamide
Can be 1:0.1-10, preferably 0.15-3 with the weight ratio of temperature-resistant anti-salt monomer.
The method according to the invention, the present invention to hydrolysising condition without particular/special requirement, under preferable case, described
Hydrolysising condition includes: temperature can be 50-110 DEG C, preferably 70-90 DEG C；Time can be 0.5-6
Hour, preferably 1-4 hour.
The method according to the invention, the present invention is to drying condition without particular/special requirement, and described drying means is permissible
Using hot-air seasoning, described hot air drying temperature can be 40-120 DEG C, preferably 70-90 DEG C；Heat
The air-dried dry time can be 0.2-4 hour, preferably 0.5-2 hour.
In following example, the performance test of product uses following methods to carry out:
1, solid content is measured according to the method for regulation in GB12005.2-89；
2, dissolution time is measured according to the method for regulation in GB12005.8-89；
3, intrinsic viscosity is measured according to the method for regulation in GB12005.1-89；
4, formula M=([η]/K) 1/ α is used to calculate poly-according to the method for regulation in GB12005.10-92
The viscosity-average molecular weight of compound, wherein, K=4.75 × 10-3, α=0.80, [η] is intrinsic viscosity；
5, the apparent viscosity of aqueous solutions of polymers is to measure by Brookfield viscosity at a temperature of 95 DEG C
Fixed；
6, survey according to Shengli Oilfiedld Subsidiary Company Of China Petrochemical Corporation's company standard Q/SH10201572-2006
Determine the filtration ratio of the aqueous solution of polymer, insolubles content and AM residual monomer content；
7, degree of hydrolysis is measured according to the method for regulation in GB12005.6-89；
Embodiment 1
The present embodiment is used for illustrating the preparation of the middle hyposmosis temperature-tolerant anti-salt polyacrylamide according to the present invention
Method.
In batching kettle add 869.56 kilograms of AM and 130.43 kilograms of AMPS, 4000 kilograms go from
Sub-water, under stirring, controls solution temperature 0 DEG C with chilled brine, adds sodium hydroxide regulation pH
To 7, add 1 kilogram of Isosorbide-5-Nitrae-hydroquinone.Monomer solution is pumped in polymeric kettle, add water solublity even
Nitrogen initiator 2,2 '-azo (2-amidine propane) dihydrochloride 50 grams and reduction auxiliary agent N, N, N ', N '-tetramethyl
Ethylenediamine 50 grams, logical high pure nitrogen deoxygenation 0.5h, add sodium sulfite 50 grams and Ammonium persulfate. 50
Gram, continue logical nitrogen until thermocouple starts to warm up in polymeric kettle, response time 15h.Open reactor
End ball valve, is extruded the copolymer colloid obtained by 0.3MPa compressed air, is become by granulator granulation
The little micelle of 4-6 millimeter.The little micelle obtained and 130.43 kilogram sodium hydroxide grain alkali are mediated contact,
4h is hydrolyzed, after secondary granulation, by crushing and screening and be packaged to be 20-80 mesh at temperature 90 DEG C
Product, and the basic physical and chemical index of this polyacrylamide is as shown in table 1.
Embodiment 2
The present embodiment is used for illustrating the preparation of the middle hyposmosis temperature-tolerant anti-salt polyacrylamide according to the present invention
Method.
Addition 250 kilograms of AM and 750 kilograms of AMPS in batching kettle, 2330 kilograms of deionized waters,
Under stirring, control solution temperature 15 DEG C with chilled brine, add sodium hydroxide regulation pH to 5.
Add 1 kilogram of hydrazine hydrate, monomer solution pumped in polymeric kettle, add water-soluble azo initiator 2,2 '-
Azo (2-amidine propane) dihydrochloride 500 grams and reduction auxiliary agent N, N, N ', N '-tetramethylethylenediamine 500
Gram, logical high pure nitrogen deoxygenation 0.5h, add sodium sulfite 500 grams and Ammonium persulfate. 500 grams, continue
Lead to nitrogen until thermocouple starts to warm up in polymeric kettle, response time 6h.Open Polycondensation Reactor and Esterification Reactor ball valve, use
The copolymer colloid obtained is extruded by 0.3MPa compressed air, becomes the little of 4-6 millimeter by granulator granulation
Micelle.The little micelle obtained and 12.5 kilogram sodium hydroxide grain alkali are mediated contact, under temperature 70 C
Hydrolysis 1h, after secondary granulation, is dried 2h, by crushing and screening and packing under the conditions of 70 DEG C of hot blasts
Obtain the product of 20-80 mesh, and the basic physical and chemical index of this polyacrylamide is as shown in table 1.
Embodiment 3
The present embodiment is used for the modified propylene amide/2-acrylamido-2-methyl-prop illustrated according to the present invention
Sodium sulfonate/sodium acrylate terpolymer and preparation method thereof.
Adding 618 kilograms of AM and 382 kilograms of temperature-resistant anti-salt monomer I in batching kettle, 3000 kilograms are gone
Ionized water, under stirring, controls solution temperature 0 DEG C with chilled brine, adds sodium hydroxide regulation pH
To 10.Add 0.1 kilogram of 2-methyl-2-propylene-1-sodium sulfonate, monomer solution pumped in polymeric kettle,
Add water-soluble azo initiator 2,2 '-azo (2-amidine propane) dihydrochloride 200 grams and reduction auxiliary agent
N, N, N ', N '-tetramethylethylenediamine 200 grams, logical high pure nitrogen deoxygenation 0.5h, add sodium sulfite 150
Gram and Ammonium persulfate. 200 grams, continue logical nitrogen until thermocouple starts to warm up in polymeric kettle, response time 8h.
Open Polycondensation Reactor and Esterification Reactor ball valve, by 0.3MPa compressed air, the copolymer colloid obtained is extruded, by making
Grain machine is a granulated into the little micelle of 4-6 millimeter.By the little micelle obtained and 74.16 kilogram sodium hydroxide grain alkali
Mediate contact, at temperature 85 DEG C, hydrolyze 1.5h, after secondary granulation, dry under the conditions of 70 DEG C of hot blasts
Dry 2h, by crushing and screening and be packaged to be the product of 20-80 mesh, and the basic reason of this polyacrylamide
Change performance indications as shown in table 1.
Embodiment 4
The present embodiment is used for illustrating the preparation of the middle hyposmosis temperature-tolerant anti-salt polyacrylamide according to the present invention
Method.
869.56 kilograms of AM, 60.43 kilograms of AMPS and 70 kg ethylene bases are added in batching kettle
Ketopyrrolidine, 4000 kilograms of deionized waters, under stirring, control solution temperature 0 DEG C with chilled brine,
Add sodium hydroxide regulation pH to 7, add 0.5 kilogram of hydrazine hydrate.Monomer solution is pumped into polymerization
In still, add water-soluble azo initiator 2,2 '-azo (2-amidine propane) dihydrochloride 50 grams and reduction and help
Agent N, N, N ', N '-tetramethylethylenediamine 50 grams, logical high pure nitrogen deoxygenation 0.5h, add sodium sulfite
50 grams and Ammonium persulfate. 50 grams, continue logical nitrogen until thermocouple starts to warm up, during reaction in polymeric kettle
Between 15h.Open Polycondensation Reactor and Esterification Reactor ball valve, by 0.3MPa compressed air, the copolymer colloid obtained extruded,
The little micelle of 4-6 millimeter is become by granulator granulation.The little micelle obtained and 130.43 kg of hydrogen are aoxidized
Sodium grain alkali mediates contact, hydrolyzes 4h at temperature 90 DEG C, after secondary granulation, by crushing and screening and
It is packaged to be the product of 20-80 mesh, and the basic physical and chemical index of this polyacrylamide is as shown in table 1.
Embodiment 5
The present embodiment is used for illustrating the preparation of the middle hyposmosis temperature-tolerant anti-salt polyacrylamide according to the present invention
Method.
869.56 kilograms of AM, 110.43 kilograms of AMPS and 20 kilograms of 2-propylene are added in batching kettle
Amide groups dodecane sulfonic acid, 4000 kilograms of deionized waters, under stirring, control solution with chilled brine
Temperature 0 DEG C, adds sodium hydroxide regulation pH to 7, adds 0.5 kilogram of MEHQ.By monomer
Solution pumps in polymeric kettle, adds water-soluble azo initiator 2,2 '-azo (2-amidine propane) dihydrochloride
50 grams and reduction auxiliary agent N, N, N ', N '-tetramethylethylenediamine 50 grams, logical high pure nitrogen deoxygenation 0.5h, add
Enter sodium sulfite 50 grams and Ammonium persulfate. 50 grams, continue logical nitrogen until thermocouple starts in polymeric kettle
Heat up, response time 15h.Open Polycondensation Reactor and Esterification Reactor ball valve, by 0.3MPa compressed air by being total to of obtaining
Polymers colloid extrudes, and is become the little micelle of 4-6 millimeter by granulator granulation.By the little micelle that obtains with
130.43 kilogram sodium hydroxide grain alkali mediate contact, hydrolyze 4h at temperature 90 DEG C, after secondary granulation,
By crushing and screening and be packaged to be the product of 20-80 mesh, and the basic physicochemical property of this polyacrylamide
Index is as shown in table 1.
Comparative example 1
Use same process condition with embodiment 1, except for the difference that, do not add regulator, prepare
Polyacrylamide, and the basic physical and chemical index of this polyacrylamide is as shown in table 1.
Comparative example 2
Use same process condition with embodiment 1, except for the difference that, regulate pH with inorganic alkaline compound
To 4, the polyacrylamide prepared, and the basic physical and chemical index of this polyacrylamide such as table 1
Shown in.
Comparative example 3
Using same process condition with embodiment 1, initiator amount is constant, except for the difference that, adds 10
Kilogram regulator Isosorbide-5-Nitrae-hydroquinone, the polyacrylamide prepared, and this polyacrylamide is basic
Physical and chemical index is as shown in table 1.
The embodiment 1 that is given from table 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5, right
The basic physical and chemical index of the product of ratio 1, comparative example 2 and comparative example 3 gained understands, and modulation divides
Kind and the consumption of son amount regulator can realize the molecular weight of Heat Resistant and Salt Tolerant Polymer at 800-1000 ten thousand
Between arbitrarily regulate.As a example by the polymer of same molecular amount, the temperature-resistant anti-salt that embodiment 5 prepares
Polymer can reach 24.8mPa s 95 DEG C of apparent viscosity values, and same molecular weight polyacrylamide table
See viscosity number and be only 11.2mPa s.Shearing experiment also indicates that the middle hyposmosis heatproof that the present invention obtains simultaneously
Salt-resistant polymer has bigger anti-shearing advantage than plain polypropylene amide.
In comparative example 1, not adding regulator, molecular weight of product reaches 13,100,000, beyond (20-100
×10-3um2) low-permeability oil pool do not exceeds the upper limit requirement of 10,000,000 to polymer molecular weight.
In comparative example 2, the polymer solubility obtained is bad, and dissolution time is far longer than 2 hours, institute
Not carry out molecular weight, apparent viscosity and the test of shear viscosity retention rate.
In comparative example 3, the polymer molecular weight obtained is 2,100,000, beyond (20-100 × 10-3um2)
Low-permeability oil pool is not below the lower limit requirement of 8,000,000 to polymer molecular weight.
Table 1
Claims (16)
1. a preparation method for polyacrylamide, its preparation method comprises the following steps:
(1) preparation acrylamide and temperature-resistant anti-salt monomer solution, regulates pH to 5-10 with inorganic alkaline compound, obtains acrylamide/temperature-resistant anti-salt monomer solution；
(2) acrylamide obtained in step (1)/temperature-resistant anti-salt monomer solution adds molecular weight regulator；
(3) under the conditions of aqueous solution polymerization, under inert gas shielding, initiator system is contacted with the acrylamide/temperature-resistant anti-salt monomer solution adding molecular weight regulator in step (2), obtains polymer gel；
(4) polymer gel obtained in step (3) is carried out a pelletize, hydrolysis, secondary granulation, is dried, pulverizes and sieves；
Wherein, described molecular weight regulator is one or more in Isosorbide-5-Nitrae-hydroquinone, MEHQ, thiourea, 2-methyl-2-propylene-1-sulfonic acid and hydrazine hydrate,
Wherein, the molecular weight of described polyacrylamide is 800 ten thousand to 1,000 ten thousand.
Method the most according to claim 1, wherein, described temperature-resistant anti-salt monomer is acrylic acid, 2-acrylamide-2-methylpro panesulfonic acid, N, N-DMAA, N, one or more in N-acrylamide, vinyl pyrrolidone, 2-acrylamido dodecane sulfonic acid, 2-acrylamido tetradecane sulfonic acid and 2-acrylamido hexadecane sulfonic acid.
Method the most according to claim 1, wherein, described initiator system includes water-soluble azo series initiators, amine reduction auxiliary agent, sulfite reducing agent and oxidant.
Method the most according to claim 3, wherein, described water-soluble azo series initiators is 2,2 '-azo (2-amidine propane) dihydrochloride, 2,2 '-azo (2-imidazoline propane) dihydrochloride and 4, one or more in 4 '-azo double (4-cyanopentanoic acid)；Described amine reduction auxiliary agent is N, N-dimethylethanolamine, N, N-lupetazin, tetramethylurea element, N, N, N ', one or more in N '-tetramethylethylenediamine；Described sulfite reducing agent is water-soluble sulfite；Described oxidant is one or more in Ammonium persulfate., sodium peroxydisulfate, potassium peroxydisulfate.
Method the most according to claim 4, wherein, described water-soluble azo series initiators is 2,2 '-azo (2-amidine propane) dihydrochloride；Described amine reduction auxiliary agent is N, N, N ', N '-tetramethylethylenediamine；Described sulfite reducing agent is one or more in ammonium sulfite, potassium sulfite and sodium sulfite；Described oxidant is Ammonium persulfate. and/or potassium peroxydisulfate.
Method the most according to claim 3, wherein, on the basis of 100 parts by weight propylene amide and temperature-resistant anti-salt monomer solution, described molecular weight regulator is 0.001-0.1 weight portion；The consumption of described water-soluble azo series initiators is 0.001-0.1 weight portion；The consumption of described amine reduction auxiliary agent is 0.001-0.1 weight portion；The consumption of described sulfite reducing agent is 0.001-0.1 weight portion；The consumption of described oxidant is 0.001-0.1 weight portion.
Method the most according to claim 6, wherein, on the basis of 100 parts by weight propylene amide and temperature-resistant anti-salt monomer solution, described molecular weight regulator is 0.005-0.05 weight portion；The consumption of described water-soluble azo series initiators is 0.005-0.05 weight portion；The consumption of described amine reduction auxiliary agent is 0.005-0.05 weight portion；The consumption of described sulfite reducing agent is 0.005-0.05 weight portion；The consumption of described oxidant is 0.005-0.05 weight portion.
Method the most according to claim 1, wherein, in step (3), described aqueous solution polymerization condition includes: temperature is 0 DEG C to 20 DEG C, and the time is 2-12 hour.
Method the most according to claim 8, wherein, in step (3), described aqueous solution polymerization condition includes: temperature is 5 DEG C to 15 DEG C；Time is 4-8 hour.
Method the most according to claim 2, wherein, in step (1), in described acrylamide and temperature-resistant anti-salt monomer solution, the total concentration of acrylamide and temperature-resistant anti-salt monomer is 15-40 weight %；The weight ratio of acrylamide and temperature-resistant anti-salt monomer is 1:0.1-10.
11. methods according to claim 10, wherein, in step (1), in described acrylamide and temperature-resistant anti-salt monomer solution, the total concentration of acrylamide and temperature-resistant anti-salt monomer is 20-30 weight %；The weight ratio of acrylamide and temperature-resistant anti-salt monomer is 1:0.15-3.
12. methods according to claim 2, in step (4), hydrolysising condition includes: temperature is 50-110 DEG C, and the time is 0.5-6 hour.
13. methods according to claim 12, in step (4), hydrolysising condition includes: temperature is 70-90 DEG C, and the time is 1-4 hour.
14. methods according to claim 2, in step (4), drying condition includes: temperature is 40-120 DEG C, and the time of hot air drying is 0.2-4 hour.
15. methods according to claim 14, in step (4), drying condition includes: temperature is 70-90 DEG C, and the time of hot air drying is 0.5-2 hour.
16. polyacrylamides prepared by any one preparation method in claim 1-15.
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| CN107081858B (en) * | 2017-04-24 | 2019-11-05 | 江苏昌九农科化工有限公司 | A kind of prilling of ultra-low molecular weight polyacrylamide |
| CN109134751A (en) * | 2017-06-19 | 2019-01-04 | 天津博弘化工有限责任公司 | A kind of novel heatproof anti-salt polyacrylamide and its synthetic method |
| CN107987211A (en) * | 2017-12-07 | 2018-05-04 | 河南正佳能源环保股份有限公司 | The synthetic method of quarternary copolymerized salt resistance temperature resistance polyacrylamide |
| CN110452322B (en) * | 2018-05-08 | 2021-12-17 | 上海芮津化工科技发展有限公司 | Synthetic method of polyacrylamide and copolymer thereof |
| CN109575166A (en) * | 2018-11-26 | 2019-04-05 | 黑龙江龙徽化工有限公司 | A kind of polymeric additive |
| JP7215955B2 (en) * | 2019-04-16 | 2023-01-31 | 住友化学株式会社 | Porous layer for non-aqueous electrolyte secondary battery |
| CN113736013B (en) * | 2020-05-28 | 2023-02-10 | 中国石油天然气股份有限公司 | Temperature-resistant salt-resistant polyacrylamide with adjustable molecular weight and preparation method thereof |
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