CN104448121A - Polyacrylamide and preparation method thereof - Google Patents
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- CN104448121A CN104448121A CN201310421093.0A CN201310421093A CN104448121A CN 104448121 A CN104448121 A CN 104448121A CN 201310421093 A CN201310421093 A CN 201310421093A CN 104448121 A CN104448121 A CN 104448121A
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Abstract
The invention discloses polyacrylamide and a preparation method thereof, the method comprises the following steps: 1)preparing acrylamide and a heatproof salt-resistance monomer aqueous solution, adjusting pH value to 5-10 by using an inorganic alkaline compound; 2)adding a molecular weight conditioning agent in acrylamide and the heatproof salt resistance monomer aqueous solution; 3)under condition of aqueous solution polymerization and protection of inert gas, contacting an initiation system with acrylamide and the heatproof salt-resistance monomer aqueous solution to obtain polymer gel; and 4)performing initial granulation, hydrolysis, secondary granulation, drying, crushing and sieving on the polymer gel. In the invention, the copolymer molecular weight can be controlled in eight millions-ten millions by the molecular weight conditioning agent; polyacrylamide has good tackifying effect at high temperature and high mineral degree, can be widely used in the petrochemical industry filed, and can be taken as a middle and low penetration (penetration rate is 20-100*10<-3>um<2>)high temperature high-salt oil reservoir tertiary oil recovery oil displacement agent.
Description
Technical field
The present invention relates to a kind of temperature resistant antisalt water-soluble polymers and preparation method thereof, particularly relate to lower molecular weight temperature-tolerant anti-salt polyacrylamide and preparation method thereof in one.
Background technology
With Daqing oil field and Shengli Oil Field for representative, high molecular weight moieties hydro-polyacrylamide (HPAM), in conventional oil reservoir tertiary oil recovery (EOB) technology, has obtained large-scale promotion and application.Along with the minimizing of applicable chemical flooding high-quality resource, chemical flooding technology is to high temperature and high salt oil deposit and low-permeability oil deposit development.Such as in recent years, in the petroleum-in-place that Sinopec is newly verified, the ratio shared by low-permeability oil deposit reserves is up to 60%-70%, and low-permeability oil deposit will be the Main Resources basis that an increasing the storage in period quite growing from now on is produced.
Therefore, how to improve and the exploitation effect that improves low permeability oil field is problem demanding prompt solution.
In routine, low-molecular-weight HPAM is not suitable for the tertiary oil recovery of high temperature and high salt middle and low permeable reservoir, is mainly reflected in two aspects, and one is out that high temperature and high salt makes soltion viscosity reduce, and the corresponding ability improving water-oil mobility ratio dies down, and causes HPAM oil displacement efficiency not remarkable.In addition, at high temperature, when there is dissolved oxygen in oxygen and solution in air, main polymer chain also can be caused to rupture soltion viscosity is significantly declined.Two is that the shearing force of middle and low permeable reservoir near wellbore also can cause the shear degradation that HPAM is serious.
Middle and low permeable reservoir rate of permeation is low, has comparatively be strict with Molecular Weight for Polyacrylamide.Exploitation temperature resistant antisalt, the temperature-tolerant anti-salt polyacrylamide with suitable molecular weight is one of important channel of improving low permeability pay recovery ratio.
Summary of the invention
The Molecular Weight for Polyacrylamide that the object of the invention is to overcome prior art is not suitable for the defect of high temperature and high salt middle and low permeable reservoir tertiary oil recovery, provides lower molecular weight in one (800-1000 ten thousand) temperature-tolerant anti-salt polyacrylamide and preparation method thereof.
The invention provides a kind of preparation method of polyacrylamide, its preparation method comprises the following steps:
(1) prepare acrylamide and temperature resistant antisalt monomer solution, regulate pH to 5-10 with inorganic alkaline compound, obtain acrylamide/temperature resistant antisalt monomer solution;
(2) molecular weight regulator is added in the acrylamide/temperature resistant antisalt monomer solution obtained in step (1);
(3) under aqueous solution polymerization condition, under protection of inert gas, initiator system is contacted with the acrylamide/temperature resistant antisalt monomer solution adding molecular weight regulator in step (2), obtains polymer gel;
(4) polymer gel obtained in step (3) is carried out granulation, hydrolysis, secondary granulation, drying, pulverizing and a screening.
The temperature resistant antisalt monomer that the present invention adopts has the water-soluble of excellence, temperature resistant antisalt performance and polymerization activity.Molecular weight of copolymer (800-1000 ten thousand) accurately can be controlled by molecular weight regulator, the middle lower molecular weight temperature-tolerant anti-salt polyacrylamide that the present invention prepares has good Efficient Adhesive Promotion under high temperature and high ore deposit degree, petrochemical industry can be used for by wide model, particularly hyposmosis (rate of permeation 20-100 × 10 in conduct
-3um
2) high temperature and high salt oil deposit Flooding Agent for EOR.
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
According to the preparation method that the invention provides a kind of polyacrylamide, its preparation method comprises the following steps:
(1) prepare acrylamide and temperature resistant antisalt monomer solution, regulate pH to 5-10 with inorganic alkaline compound, obtain acrylamide/temperature resistant antisalt monomer solution;
(2) molecular weight regulator is added in the acrylamide/temperature resistant antisalt monomer solution obtained in step (1);
(3) under aqueous solution polymerization condition, under protection of inert gas, initiator system is contacted with the acrylamide/temperature resistant antisalt monomer solution adding molecular weight regulator in step (2), obtains polymer gel;
(4) polymer gel obtained in step (3) is carried out granulation, hydrolysis, secondary granulation, drying, pulverizing and a screening.
According to the present invention, in step (1), described comonomer acrylamide can be vinylformic acid, 2-acrylamide-2-methylpro panesulfonic acid, N, one or more in N-DMAA, N, N-acrylamide, vinyl pyrrolidone, 2-acrylamido dodecane sulfonic acid, 2-acrylamido tetradecane sulfonic acid and 2-acrylamido hexadecyl sulfonic acid.
According to the present invention, inorganic alkaline compound described in step (1) is for regulating the pH value of acrylamide and the temperature resistant antisalt monomer I aqueous solution.Described inorganic alkaline compound can be one or more in sodium hydroxide, potassium hydroxide and sodium carbonate, and preferably, described inorganic alkaline compound is sodium hydroxide.
According to the present invention, molecular weight regulator described in step (2) can think in Isosorbide-5-Nitrae-Resorcinol, MEHQ, thiourea, 2-methyl-2-propylene-1-sulfonic acid and hydrazine hydrate one or more.
According to the present invention, initiator system described in step (3) comprises water-soluble azo series initiators, amine reduction auxiliary agent, sulfite reducing agent and oxygenant.The content of the reduction of described water-soluble azo series initiators, amine auxiliary agent, sulfite reducing agent and oxygenant suitably can be selected according to concrete service requirements.
According to the present invention, with 100 parts by weight propylene acid amides and temperature resistant antisalt monomer solution for benchmark, molecular weight regulator can be 0.01-1 weight part, is preferably 0.01-0.1 weight part; The consumption of water-soluble azo series initiators can be 0.001-0.1 weight part, is preferably 0.005-0.05 weight part; The consumption of amine reduction auxiliary agent can be 0.001-0.1 weight part, is preferably 0.005-0.05 weight part; The consumption of sulfite reducing agent can be 0.001-0.1 weight part, is preferably 0.005-0.05 weight part; The consumption of oxygenant is 0.001-0.1 weight part, is preferably 0.005-0.05 weight part.
According to the present invention, described water-soluble azo series initiators can be 2,2 '-azo (2-amidine propane) dihydrochloride, 2,2 '-azo (2-tetrahydroglyoxaline propane) dihydrochloride and 4, one or more in 4 '-azo two (4-cyanopentanoic acid), be preferably 2,2 '-azo (2-amidine propane) dihydrochloride.
According to the present invention, described sulfite reducing agent can be one or more in ammonium sulphite, potassium sulfite, S-WAT, ammonium bisulfite, Potassium hydrogen sulfite and sodium bisulfite, is preferably sodium bisulfite.
According to the present invention, described oxygenant can be one or more in ammonium persulphate, Sodium Persulfate, Potassium Persulphate, is preferably ammonium persulphate.
According to the present invention, described amine reduction auxiliary agent can be N, N-dimethylethanolamine, N, N-lupetazin, tetramethyl-urea element, N, N, N ', one or more in N '-Tetramethyl Ethylene Diamine, preferably N, N, N ', N '-Tetramethyl Ethylene Diamine.
According to the present invention, the present invention does not have particular requirement to aqueous solution polymerization condition, can carry out with reference to prior art, and preferably, described aqueous solution polymerization condition comprises: temperature can be 0 DEG C to 20 DEG C, is preferably 5 DEG C to 15 DEG C; Time can be 2-12 hour, is preferably 4-8 hour.
According to the present invention, the present invention does not have particular requirement to concentration of aqueous solution, and preferably, the total concn of acrylamide and temperature resistant antisalt monomer can be 15-40 % by weight, preferred 20-30 % by weight; The weight ratio of acrylamide and temperature resistant antisalt monomer can be 1:0.1-10, is preferably 0.15-3.
According to method of the present invention, the present invention is to hydrolysising condition without particular requirement, and under preferable case, described hydrolysising condition comprises: temperature can be 50-110 DEG C, is preferably 70-90 DEG C; Time can be 0.5-6 hour, is preferably 1-4 hour.
According to method of the present invention, the present invention is to drying conditions without particular requirement, and described drying means can adopt hot air seasoning, and described warm air drying temperature can be 40-120 DEG C, is preferably 70-90 DEG C; The time of warm air drying can be 0.2-4 hour, is preferably 0.5-2 hour.
In following examples, the performance test of product adopts following methods to carry out:
1, solid content is measured according to the method specified in GB12005.2-89;
2, dissolution time is measured according to the method specified in GB12005.8-89;
3, intrinsic viscosity is measured according to the method specified in GB12005.1-89;
4, formula M=([η]/K) 1/ α is adopted to calculate the viscosity-average molecular weight of polymkeric substance according to the method specified in GB12005.10-92, wherein, K=4.75 × 10-3, α=0.80, [η] is intrinsic viscosity;
5, the apparent viscosity of aqueous solutions of polymers is at the temperature of 95 DEG C, use Brookfield viscometer determining;
6, the filtration ratio of the aqueous solution of polymkeric substance, insolubles content and AM residual monomer content is measured according to Shengli Oilfiedld Subsidiary Company Of China Petrochemical Corporation company standard Q/SH10201572-2006;
7, degree of hydrolysis is measured according to the method specified in GB12005.6-89;
Embodiment 1
The present embodiment is used for the preparation method according to middle hyposmosis temperature-tolerant anti-salt polyacrylamide of the present invention is described.
In batching kettle, add 869.56 kilograms of AM and 130.43 kilogram AMPS, 4000 kilograms of deionized waters, under whipped state, control solution temperature 0 DEG C with chilled brine, add sodium hydroxide and regulate pH to 7, add 1 kilogram of Isosorbide-5-Nitrae-Resorcinol.Monomer solution is pumped in polymeric kettle, add water-soluble azo initiator 2,2 '-azo (2-amidine propane) dihydrochloride 50 grams and reduction auxiliary agent N, N, N ', N '-Tetramethyl Ethylene Diamine 50 grams, logical high pure nitrogen deoxygenation 0.5h, add sodium bisulfite 50 grams and ammonium persulphate 50 grams, continue logical nitrogen until thermopair starts to heat up in polymeric kettle, reaction times 15h.Open Polycondensation Reactor and Esterification Reactor ball valve, with 0.3MPa pressurized air, the copolymer colloid obtained is extruded, become the little micelle of 4-6 millimeter by granulator granulation.Mediated with 130.43 kilogram sodium hydroxide grain alkali by the little micelle obtained and contact, at temperature 90 DEG C, be hydrolyzed 4h, after secondary granulation, by crushing and screening and be packaged to be 20-80 object 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 the preparation method according to middle hyposmosis temperature-tolerant anti-salt polyacrylamide of the present invention is described.
In batching kettle, add 250 kilograms of AM and 750 kilogram AMPS, 2330 kilograms of deionized waters, under whipped state, control solution temperature 15 DEG C with chilled brine, add sodium hydroxide and regulate pH to 5.Add 1 kilogram of hydrazine hydrate, monomer solution is 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 '-Tetramethyl Ethylene Diamine 500 grams, logical high pure nitrogen deoxygenation 0.5h, adds sodium bisulfite 500 grams and ammonium persulphate 500 grams, continue logical nitrogen until thermopair starts to heat up in polymeric kettle, reaction times 6h.Open Polycondensation Reactor and Esterification Reactor ball valve, with 0.3MPa pressurized air, the copolymer colloid obtained is extruded, become the little micelle of 4-6 millimeter by granulator granulation.The little micelle obtained is mediated with 12.5 kilogram sodium hydroxide grain alkali and contacts, 1h is hydrolyzed under temperature 70 C, after secondary granulation, dry 2h under 70 DEG C of hot blast conditions, by crushing and screening and be packaged to be 20-80 object product, and the basic physical and chemical index of this polyacrylamide is as shown in table 1.
Embodiment 3
The present embodiment is used for illustrating according to modified propylene acid amides of the present invention/2-acrylamide-2-methylpro panesulfonic acid sodium/sodium acrylate terpolymer and preparation method thereof.
In batching kettle, add 618 kilograms of AM and 382 kilogram temperature resistant antisalt monomer I, 3000 kilograms of deionized waters, under whipped state, control solution temperature 0 DEG C with chilled brine, add sodium hydroxide and regulate pH to 10.Add 0.1 kilogram of 2-methyl-2-propylene-1-sodium sulfonate, monomer solution is 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 '-Tetramethyl Ethylene Diamine 200 grams, logical high pure nitrogen deoxygenation 0.5h, adds sodium bisulfite 150 grams and ammonium persulphate 200 grams, continue logical nitrogen until thermopair starts to heat up in polymeric kettle, reaction times 8h.Open Polycondensation Reactor and Esterification Reactor ball valve, with 0.3MPa pressurized air, the copolymer colloid obtained is extruded, become the little micelle of 4-6 millimeter by granulator granulation.The little micelle obtained is mediated with 74.16 kilogram sodium hydroxide grain alkali and contacts, 1.5h is hydrolyzed at temperature 85 DEG C, after secondary granulation, dry 2h under 70 DEG C of hot blast conditions, by crushing and screening and be packaged to be 20-80 object product, and the basic physical and chemical index of this polyacrylamide is as shown in table 1.
Embodiment 4
The present embodiment is used for the preparation method according to middle hyposmosis temperature-tolerant anti-salt polyacrylamide of the present invention is described.
869.56 kilograms of AM are added, 60.43 kilograms of AMPS and 70 kg ethylene base pyrrolidone, 4000 kilograms of deionized waters in batching kettle, under whipped state, control solution temperature 0 DEG C with chilled brine, add sodium hydroxide and regulate pH to 7, add 0.5 kilogram of hydrazine hydrate.Monomer solution is pumped in polymeric kettle, add water-soluble azo initiator 2,2 '-azo (2-amidine propane) dihydrochloride 50 grams and reduction auxiliary agent N, N, N ', N '-Tetramethyl Ethylene Diamine 50 grams, logical high pure nitrogen deoxygenation 0.5h, add sodium bisulfite 50 grams and ammonium persulphate 50 grams, continue logical nitrogen until thermopair starts to heat up in polymeric kettle, reaction times 15h.Open Polycondensation Reactor and Esterification Reactor ball valve, with 0.3MPa pressurized air, the copolymer colloid obtained is extruded, become the little micelle of 4-6 millimeter by granulator granulation.Mediated with 130.43 kilogram sodium hydroxide grain alkali by the little micelle obtained and contact, at temperature 90 DEG C, be hydrolyzed 4h, after secondary granulation, by crushing and screening and be packaged to be 20-80 object product, and the basic physical and chemical index of this polyacrylamide is as shown in table 1.
Embodiment 5
The present embodiment is used for the preparation method according to middle hyposmosis temperature-tolerant anti-salt polyacrylamide of the present invention is described.
869.56 kilograms of AM are added, 110.43 kilograms of AMPS and 20 kilogram of 2-acrylamido dodecane sulfonic acids, 4000 kilograms of deionized waters in batching kettle, under whipped state, control solution temperature 0 DEG C with chilled brine, add sodium hydroxide and regulate pH to 7, add 0.5 kilogram of MEHQ.Monomer solution is pumped in polymeric kettle, add water-soluble azo initiator 2,2 '-azo (2-amidine propane) dihydrochloride 50 grams and reduction auxiliary agent N, N, N ', N '-Tetramethyl Ethylene Diamine 50 grams, logical high pure nitrogen deoxygenation 0.5h, add sodium bisulfite 50 grams and ammonium persulphate 50 grams, continue logical nitrogen until thermopair starts to heat up in polymeric kettle, reaction times 15h.Open Polycondensation Reactor and Esterification Reactor ball valve, with 0.3MPa pressurized air, the copolymer colloid obtained is extruded, become the little micelle of 4-6 millimeter by granulator granulation.Mediated with 130.43 kilogram sodium hydroxide grain alkali by the little micelle obtained and contact, at temperature 90 DEG C, be hydrolyzed 4h, after secondary granulation, by crushing and screening and be packaged to be 20-80 object product, and the basic physical and chemical index of this polyacrylamide is as shown in table 1.
Comparative example 1
Same process condition is adopted with embodiment 1, unlike, do not add conditioning agent, the polyacrylamide prepared, and the basic physical and chemical index of this polyacrylamide is as shown in table 1.
Comparative example 2
Same process condition is adopted with embodiment 1, unlike, regulate pH to 4 with inorganic alkaline compound, the polyacrylamide prepared, and the basic physical and chemical index of this polyacrylamide is as shown in table 1.
Comparative example 3
Adopt same process condition with embodiment 1, initiator amount is constant, unlike, add 10 kilograms of conditioning agent Isosorbide-5-Nitrae-Resorcinol, the polyacrylamide prepared, and the basic physical and chemical index of this polyacrylamide is as shown in table 1.
The basic physical and chemical index of the product of the embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5, comparative example 1, comparative example 2 and comparative example 3 gained that provide from table 1, the molecular weight that the kind of modulation molecular weight regulator and consumption can realize Heat Resistant and Salt Tolerant Polymer regulates arbitrarily between 800-1000 ten thousand.For the polymkeric substance of same molecular amount, the Heat Resistant and Salt Tolerant Polymer that embodiment 5 prepares can reach 24.8mPas 95 DEG C of apparent viscosity values, and same molecular weight polyacrylamide apparent viscosity value is only 11.2mPas.Shearing experiment also shows that the middle hyposmosis Heat Resistant and Salt Tolerant Polymer that the present invention obtains has larger anti-shearing advantage than plain polypropylene acid amides simultaneously.
In comparative example 1, do not add conditioning agent, molecular weight of product reaches 1,310 ten thousand, exceeds (20-100 × 10
-3um
2) low-permeability oil pool do not exceed the upper limit requirement of 1,000 ten thousand to polymericular weight.
In comparative example 2, the polymer solubility obtained is bad, and dissolution time is far longer than 2 hours, so do not carry out the test of molecular weight, apparent viscosity and shear viscosity retention rate.
In comparative example 3, the polymericular weight obtained is 2,100,000, exceeds (20-100 × 10
-3um
2) low-permeability oil pool to polymericular weight not lower than 8,000,000 lower limit requirement.
Table 1
Claims (11)
1. a preparation method for polyacrylamide, its preparation method comprises the following steps:
(1) prepare acrylamide and temperature resistant antisalt monomer solution, regulate pH to 5-10 with inorganic alkaline compound, obtain acrylamide/temperature resistant antisalt monomer solution;
(2) molecular weight regulator is added in the acrylamide/temperature resistant antisalt monomer solution obtained in step (1);
(3) under aqueous solution polymerization condition, under protection of inert gas, initiator system is contacted with the acrylamide/temperature resistant antisalt monomer solution adding molecular weight regulator in step (2), obtains polymer gel;
(4) polymer gel obtained in step (3) is carried out granulation, hydrolysis, secondary granulation, drying, pulverizing and a screening.
2. method according to claim 1, wherein, described temperature resistant antisalt monomer is vinylformic acid, 2-acrylamide-2-methylpro panesulfonic acid, N, one or more in N-DMAA, N, N-acrylamide, vinyl pyrrolidone, 2-acrylamido dodecane sulfonic acid, 2-acrylamido tetradecane sulfonic acid and 2-acrylamido n-Hexadecane sulfonic acid.
3. method according to claim 1, wherein, described molecular weight regulator is one or more in Isosorbide-5-Nitrae-Resorcinol, MEHQ, thiourea, 2-methyl-2-propylene-1-sulfonic acid and hydrazine hydrate.
4. method according to claim 1, wherein, described initiator system comprises water-soluble azo series initiators, amine reduction auxiliary agent, sulfite reducing agent and oxygenant.
5. the method according to claim 1 or 3, wherein, described water-soluble azo series initiators is 2,2 '-azo (2-amidine propane) dihydrochloride, 2,2 '-azo (2-tetrahydroglyoxaline propane) dihydrochloride and 4, one or more in 4 '-azo two (4-cyanopentanoic acid), are preferably 2,2 '-azo (2-amidine propane) dihydrochloride; Described amine reduction auxiliary agent is N, N-dimethylethanolamine, N, N-lupetazin, tetramethyl-urea element, N, N, N ', one or more in N '-Tetramethyl Ethylene Diamine, are preferably N, N, N ', N '-Tetramethyl Ethylene Diamine; Described sulfite reducing agent is water-soluble sulfite, is preferably one or more in ammonium sulphite, potassium sulfite and sodium bisulfite; Described oxygenant is one or more in ammonium persulphate, Sodium Persulfate, Potassium Persulphate, is preferably ammonium persulphate and/or Potassium Persulphate.
6. method according to claim 1, wherein, with 100 parts by weight propylene acid amides and temperature resistant antisalt monomer solution for benchmark, described molecular weight regulator is 0.001-0.1 weight part, is preferably 0.005-0.05 weight part; The consumption of described water-soluble azo series initiators is 0.001-0.1 weight part, is preferably 0.005-0.05 weight part; The consumption of described amine reduction auxiliary agent is 0.001-0.1 weight part, is preferably 0.005-0.05 weight part; The consumption of described sulfite reducing agent is 0.001-0.1 weight part, is preferably 0.005-0.05 weight part; The consumption of described oxygenant is 0.001-0.1 weight part, is preferably 0.005-0.05 weight part.
7. method according to claim 1, wherein, in step (3), described aqueous solution polymerization condition comprises: temperature is 0 DEG C to 20 DEG C, is preferably 5 DEG C to 15 DEG C; Time is 2-12 hour, is preferably 4-8 hour.
8. method according to claim 2, wherein, in step (1), in described acrylamide and temperature resistant antisalt monomer solution, the total concn of acrylamide and temperature resistant antisalt monomer is 15-40 % by weight, preferred 20-30 % by weight; Acrylamide and temperature resistant antisalt monomer weight ratio be 1:0.1-10, be preferably 1:0.15-3.
9. method according to claim 2, in step (4), hydrolysising condition comprises: temperature is 50-110 DEG C, is preferably 70-90 DEG C; Time is 0.5-6 hour, is preferably 1-4 hour.
10. method according to claim 2, in step (4), drying conditions comprises: temperature is 40-120 DEG C, is preferably 70-90 DEG C; The time of warm air drying is 0.2-4 hour, is preferably 0.5-2 hour.
11. polyacrylamides prepared by any one preparation method in claim 1-10.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105111368A (en) * | 2015-09-02 | 2015-12-02 | 莱芜市涌金化工有限公司 | Thermothickening high-temperature-resistant high-salt-resistant fluid diverting agent and preparation method thereof |
| CN107081858A (en) * | 2017-04-24 | 2017-08-22 | 如东南天农科化工有限公司 | A kind of prilling of ultra-low molecular weight polyacrylamide |
| 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 |
| 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 |
| CN109575166A (en) * | 2018-11-26 | 2019-04-05 | 黑龙江龙徽化工有限公司 | A kind of polymeric additive |
| CN110452322A (en) * | 2018-05-08 | 2019-11-15 | 上海芮津化工科技发展有限公司 | A kind of synthetic method of polyacrylamide and its copolymer |
| 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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| CN105111368A (en) * | 2015-09-02 | 2015-12-02 | 莱芜市涌金化工有限公司 | Thermothickening high-temperature-resistant high-salt-resistant fluid diverting agent and preparation method thereof |
| CN105111368B (en) * | 2015-09-02 | 2018-09-25 | 莱芜市涌金化工有限公司 | A kind of heat thickening resisting high temperature, high salt fluid diverting agent and preparation method thereof |
| CN107081858A (en) * | 2017-04-24 | 2017-08-22 | 如东南天农科化工有限公司 | A kind of prilling of ultra-low molecular weight polyacrylamide |
| 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 |
| CN110452322A (en) * | 2018-05-08 | 2019-11-15 | 上海芮津化工科技发展有限公司 | A kind of synthetic method of polyacrylamide and its copolymer |
| CN109575166A (en) * | 2018-11-26 | 2019-04-05 | 黑龙江龙徽化工有限公司 | A kind of polymeric additive |
| CN111834595A (en) * | 2019-04-16 | 2020-10-27 | 住友化学株式会社 | Porous layer for nonaqueous electrolyte secondary battery |
| CN113736013A (en) * | 2020-05-28 | 2021-12-03 | 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 |
| 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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