CN115028541A - Long-chain small-molecule polyamine, and preparation method and application thereof - Google Patents
Long-chain small-molecule polyamine, and preparation method and application thereof Download PDFInfo
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- 229920000768 polyamine Polymers 0.000 title claims abstract description 37
- 150000003384 small molecules Chemical class 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 35
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000013067 intermediate product Substances 0.000 claims abstract description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003999 initiator Substances 0.000 claims abstract description 20
- OSDWBNJEKMUWAV-UHFFFAOYSA-N Allyl chloride Chemical compound ClCC=C OSDWBNJEKMUWAV-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 19
- 239000004927 clay Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 239000003381 stabilizer Substances 0.000 claims abstract description 12
- 125000000217 alkyl group Chemical group 0.000 claims description 10
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 8
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 8
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 6
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 6
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 5
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 5
- 125000001424 substituent group Chemical group 0.000 claims description 5
- PHTQWCKDNZKARW-UHFFFAOYSA-N isoamylol Chemical compound CC(C)CCO PHTQWCKDNZKARW-UHFFFAOYSA-N 0.000 claims description 4
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 claims description 4
- 150000003510 tertiary aliphatic amines Chemical class 0.000 claims 1
- 239000000243 solution Substances 0.000 description 17
- 230000002579 anti-swelling effect Effects 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- -1 aliphatic tertiary amine Chemical class 0.000 description 4
- 239000007795 chemical reaction product Substances 0.000 description 4
- 238000011068 loading method Methods 0.000 description 4
- 239000012488 sample solution Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910000278 bentonite Inorganic materials 0.000 description 3
- 229940092782 bentonite Drugs 0.000 description 3
- 239000000440 bentonite Substances 0.000 description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 3
- 125000002091 cationic group Chemical group 0.000 description 3
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 229940080314 sodium bentonite Drugs 0.000 description 3
- 229910000280 sodium bentonite Inorganic materials 0.000 description 3
- 239000002734 clay mineral Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- SFBHPFQSSDCYSL-UHFFFAOYSA-N n,n-dimethyltetradecan-1-amine Chemical compound CCCCCCCCCCCCCCN(C)C SFBHPFQSSDCYSL-UHFFFAOYSA-N 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001476 alcoholic effect Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- YWFWDNVOPHGWMX-UHFFFAOYSA-N n,n-dimethyldodecan-1-amine Chemical compound CCCCCCCCCCCCN(C)C YWFWDNVOPHGWMX-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Images
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C211/00—Compounds containing amino groups bound to a carbon skeleton
- C07C211/62—Quaternary ammonium compounds
- C07C211/63—Quaternary ammonium compounds having quaternised nitrogen atoms bound to acyclic carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to long-chain micromolecule polyamine, which has the following structural formula:
wherein: m and n are positive integers, m is 12-16, and n is more than or equal to 1. A method for preparing long-chain small-molecule polyamine comprises the following steps: (1) adding an alcohol solution into a reaction vessel (a three-neck flask), then sequentially adding a certain amount of N, N-dimethyl aliphatic amine and 3-chloropropene into the reaction vessel, then heating to 20-60 ℃, and stirring for reacting for 2-10h to obtain an intermediate product; (2) adding a certain amount of initiator into the intermediate product, introducing nitrogen, heating to 60-100 ℃, stirring and reacting for 2-6h to obtain the long-chain small-molecular polyamine. By using
As a clay stabilizer.
Description
Technical Field
The invention relates to the field of chemical engineering, in particular to long-chain small-molecule polyamine and a preparation method and application thereof.
Background
Clay swelling and migration are the main factors causing the permeability of water-sensitive oil reservoirs to decrease, and a common method for preventing reservoir damage is to use clay stabilizers. The clay stabilizer is a chemical agent capable of inhibiting the clay swelling and clay particle migration of the stratum. Clay stabilizers include mainly cationic water-soluble polymers such as cationic polyacrylamides, polyquatemary ammonium salts. The clay stabilizer is beneficial to water injection of the water injection well and oil production of the oil well.
Along with the deep development of oil fields, more and more difficultly-used reserves are put into development, the oil reservoirs often have the characteristics of deep layer, high temperature, low permeability and strong sensitivity, and the commonly used clay stabilizer is often difficult to adapt to the requirement of reservoir protection in the development of the oil reservoirs.
Disclosure of Invention
Aiming at the problems in the prior art and the difficulty of synthesis, the invention provides long-chain small-molecule polyamine and a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a long chain small molecule polyamine having the structural formula:
m and n are positive integers, m is more than or equal to 12 and less than or equal to 16, and n is more than or equal to 1.
A preparation method of long-chain small-molecule polyamine comprises the following steps:
(1) adding an alcohol solution into a reaction container, then sequentially adding a certain amount of N, N-dimethyl aliphatic amine and 3-chloropropene into the reaction container, then heating to 20-60 ℃, and stirring for reacting for 2-10h to obtain an intermediate product;
(2) and adding a certain amount of initiator into the intermediate product, introducing nitrogen, heating to 60-100 ℃, stirring and reacting for 2-6 hours to obtain the long-chain small-molecular polyamine.
In the step (1), the N, N-dimethyl aliphatic amine is aliphatic tertiary amine, and alkyl in a substituent group is alkyl with 12-16 carbon atoms.
Further, in the step (1), the molar ratio of the N, N-dimethyl aliphatic amine to the 3-chloropropene is 1 (1-10).
Furthermore, in the step (1), the molar ratio of the N, N-dimethyl aliphatic amine to the 3-chloropropene is 1 (4-8).
Further, in the step (1), the alcohol solution is selected from one of ethanol, isopropanol, n-propanol, n-butanol, isobutanol and isoamyl alcohol.
Further, the molar ratio of the alcohol solution to the N, N-dimethyl fatty amine is (1-5): 1.
further, in the step (2), the initiator is potassium persulfate or sodium persulfate.
Further, the dosage of the initiator in the step (2) is 0.05-1% of the mass of the intermediate product obtained in the step (1). .
By using
As a clay stabilizer.
Has the beneficial effects that: the long-chain small-molecule polyamine disclosed by the invention and the preparation method and the application thereof have the following beneficial effects:
the long-chain micromolecule polyamine has high cationic charge density and strong temperature resistance, and can be used for a reservoir stratum at 150 ℃; the molecular weight is small, and a low-permeability reservoir with small pore throat radius and low permeability can be effectively protected; meanwhile, the clay mineral has certain surface activity, is adsorbed on the surface of a viscosity mineral, inhibits the expansion of the clay mineral, prevents the clay migration, and has super-strong inhibition performance; the application range is wide, namely the oil well and the water well are used.
Drawings
FIG. 1 is an infrared spectrum of a long chain small molecule polyamine prepared by the present invention.
The specific implementation mode is as follows:
the following describes in detail specific embodiments of the present invention.
Example 1
The method comprises the following steps: adding a proper amount of N-propanol solution into a three-neck flask, adding 21.2g of N, N-dimethyldodecylamine, slowly adding 31g of 3-chloropropene, heating to 20 ℃, stirring, and reacting for 10 hours to obtain an intermediate product;
step two: 5g of initiator potassium persulfate is added into the intermediate product, nitrogen is introduced, the temperature is raised to 60 ℃, and the reaction is stirred for 10 hours to obtain a reaction product.
Example 2
The method comprises the following steps: adding an isopropanol solution into a three-neck flask, adding 21.2g N N-dimethyldodecylamine, slowly adding 38.75g 3-chloropropene, heating to 45 ℃, stirring, and reacting for 4 hours to obtain an intermediate product;
step two: and adding 6g of initiator sodium persulfate into the intermediate product, introducing nitrogen, heating to 70 ℃, and stirring for reacting for 8 hours to obtain a reaction product.
Example 3
The method comprises the following steps: adding a normal butyl alcohol solution into a three-neck flask, adding 21.2g N, N-dimethyl tetradecylamine, slowly adding 46.5g of 3-chloropropene, heating to 55 ℃, stirring, and reacting for 10 hours to obtain an intermediate product;
step two: and adding 5g of initiator potassium persulfate into the intermediate product, introducing nitrogen, heating to 90 ℃, and reacting for 7 hours with stirring to obtain a reaction product.
Example 4
The method comprises the following steps: adding a propanol solution into a three-neck flask, adding 21.2g N, N-dimethyl tetradecylamine, slowly adding 62g of 3-chloropropene, heating to 60 ℃, stirring, and reacting for 2 hours to obtain an intermediate product;
step two: and adding 6g of initiator sodium persulfate into the intermediate product, introducing nitrogen, heating to 100 ℃, and reacting for 2 hours under stirring to obtain a reaction product.
The anti-swelling rate and the high-temperature anti-swelling rate of the invention are tested by a high-speed centrifuge.
Anti-swelling rate test
Weighing 0.50g of sodium bentonite, accurately weighing to 0.01g, loading into a 10mL centrifuge tube, adding 10mL of kerosene, fully shaking, standing at room temperature for 24h, loading into a centrifuge, centrifuging at a rotation speed of 1500r/m for 15min, and reading out the volume V of the bentonite 0 。
Weighing three parts of 0.50g of sodium bentonite, accurately weighing the three parts to 0.01g, placing the three parts in a high-temperature high-pressure closed reactor, respectively adding 10mL of distilled water, 10mL of 4% sample solution and 10mL of 4% long-chain small-molecule polyamine sample solution, fully shaking and uniformly mixing, placing the mixture in a constant-temperature drying oven at the temperature of 50 +/-1 ℃, standing for 24 hours, and naturally cooling to room temperature. Respectively transferring the clay mixed solution in the high-temperature high-pressure closed reactor into centrifuge tubes, loading into a centrifuge, centrifuging at a rotation speed of 1500r/m for 15min, and reading out the volume V of bentonite 1 、V 2 And V 3 。
And (5) testing the high-temperature anti-swelling rate.
Weighing three parts of 0.50g of sodium bentonite, accurately weighing the three parts to 0.01g, placing the three parts in a high-temperature high-pressure closed reactor, respectively adding 10mL of distilled water, 10mL of 4% sample solution and 10mL of 4% long-chain small-molecule polyamine sample solution, fully shaking and uniformly mixing, placing the mixture in a constant-temperature drying oven at the temperature of 150 +/-1 ℃ for standing for 24 hours, and naturally cooling to room temperature. Respectively transferring the clay mixed solution in the high-temperature high-pressure closed reactor into centrifuge tubes, loading into a centrifuge, centrifuging at a rotation speed of 1500r/m for 15min, and reading out the volume V of bentonite 4 、V 5 And V 6 。
Formula for calculating anti-swelling rate
Calculation formula of high-temperature anti-swelling rate
| Sample name | Expansion prevention rate | High temperature anti-swelling ratio (150 ℃ C.) |
| Small molecule polyammonium | >85％ | >80％ |
By contrast, the anti-swelling rate of long-chain small-molecule polyamines is much higher than that of conventional clay stabilizers.
The determination of the anti-swelling rate after the high-temperature treatment finds that the anti-swelling rate of the long-chain small-molecule polyamine has no change or obvious change after the high-temperature treatment at 150 ℃, which indicates that the long-chain small-molecule polymer has good temperature resistance and stable anti-swelling rate at 150 ℃. The comparative example 1 has a significantly reduced swell-proof rate and a poor temperature resistance.
The surface tension of the long-chain small-molecule polyamine was tested by a surface tensiometer. The results are shown in Table 1. It can be seen that the long chain small molecule polyamines prepared using the present invention are more surface active than other polyamines.
| Name of polyamine | Concentration (wt%) | Surface tension (mN/m) |
| Small molecule polyammonium | 1％ | 38 |
Example 5
A long chain small molecule polyamine having the structural formula:
m and n are positive integers, m is 12, and n is 1.
A preparation method of long-chain small-molecule polyamine comprises the following steps:
(1) adding an appropriate amount of alcohol solution into a reaction vessel (such as a three-neck flask), then sequentially adding a certain amount of N, N-dimethyl aliphatic amine and 3-chloropropene into the reaction vessel, then heating to 20 ℃, and stirring for reacting for 10 hours to obtain an intermediate product;
(2) adding a certain amount of initiator into the intermediate product, introducing nitrogen, heating to 60 ℃, stirring and reacting for 6 hours to obtain the long-chain small-molecular polyamine. The long-chain micromolecule polyamine is subjected to infrared spectrum detection, and figure 1 is an infrared spectrogram of the long-chain micromolecule polyamine prepared by the method.
In step (1), the N, N-dimethyl aliphatic amine is an aliphatic tertiary amine, and the alkyl group in the substituent is an alkyl group having 12 carbon atoms.
Further, in the step (1), the molar ratio of the N, N-dimethyl aliphatic amine to the 3-chloropropene is 1: 1.
Further, in the step (1), the alcohol solution is ethanol.
Further, the molar ratio of the alcohol solution to the N, N-dimethyl aliphatic amine is 1: 1.
further, in the step (2), the initiator is potassium persulfate.
Further, the amount of the initiator used in the step (2) is 0.05% of the mass of the intermediate product obtained in the step (1). .
By using
As a clay stabilizer.
Example 6
A long chain small molecule polyamine having the structural formula:
m and n are positive integers, m is 16, and n is 3.
A method for preparing long-chain small-molecule polyamine comprises the following steps:
(1) adding a proper amount of alcohol solution into a reaction vessel (such as a three-neck flask), then sequentially adding a certain amount of N, N-dimethyl aliphatic amine and 3-chloropropene into the reaction vessel, then heating to 60 ℃, and stirring for reacting for 2 hours to obtain an intermediate product;
(2) adding a certain amount of initiator into the intermediate product, introducing nitrogen, heating to 100 ℃, stirring and reacting for 2 hours to obtain the long-chain small-molecular polyamine.
In step (1), the N, N-dimethyl aliphatic amine is an aliphatic tertiary amine, and the alkyl group in the substituent is an alkyl group having 16 carbon atoms.
Further, in the step (1), the molar ratio of the N, N-dimethyl aliphatic amine to the 3-chloropropene is 1: 10.
Further, in the step (1), the alcohol solution is isopropanol.
Further, the molar ratio of the alcohol solution to the N, N-dimethyl aliphatic amine is 5: 1.
further, in the step (2), the initiator is sodium persulfate.
Further, the amount of the initiator used in the step (2) is 1% of the mass of the intermediate product obtained in the step (1). .
By using
As a clay stabilizer.
Example 7
A long chain small molecule polyamine having the structural formula:
m and n are positive integers, m is 14, and n is 10.
A preparation method of long-chain small-molecule polyamine comprises the following steps:
(1) adding a proper amount of alcohol solution into a reaction vessel (such as a three-neck flask), then sequentially adding a certain amount of N, N-dimethyl aliphatic amine and 3-chloropropene into the reaction vessel, then heating to 40 ℃, and stirring for reacting for 5 hours to obtain an intermediate product;
(2) adding a certain amount of initiator into the intermediate product, introducing nitrogen, heating to 80 ℃, stirring and reacting for 3 hours to obtain the long-chain small-molecular polyamine.
In step (1), the N, N-dimethyl aliphatic amine is an aliphatic tertiary amine, and the alkyl group in the substituent is an alkyl group having 14 carbon atoms.
Further, in the step (1), the molar ratio of the N, N-dimethyl aliphatic amine to the 3-chloropropene is 1: 4. In another embodiment, the molar ratio of the N, N-dimethyl aliphatic amine to the 3-chloropropene is 1: 8. In yet another embodiment, the molar ratio of the N, N-dimethyl aliphatic amine to 3-chloropropene is 1: 5.
Further, in the step (1), the alcohol solution is n-propanol.
Further, the molar ratio of the alcohol solution to the N, N-dimethyl aliphatic amine is 3: 1.
further, in the step (2), the initiator is potassium persulfate.
Further, the amount of the initiator used in the step (2) is 0.5% by mass of the intermediate product obtained in the step (1). .
By using
As a clay stabilizer.
Examples 8 to 13
Substantially the same as example 5, except that: the alcoholic solutions in step (1) are different:
the embodiments of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A long chain small molecule polyamine having the formula:
m and n are positive integers, m is more than or equal to 12 and less than or equal to 16, and n is more than or equal to 1.
2. A method for preparing long-chain small-molecule polyamine is characterized by comprising the following steps:
(1) adding a proper amount of alcohol solution into a reaction vessel, then sequentially adding a certain amount of N, N-dimethyl aliphatic amine and 3-chloropropene into the reaction vessel, then heating to 20-60 ℃, and stirring for reacting for 2-10h to obtain an intermediate product;
(2) and adding a certain amount of initiator into the intermediate product, introducing nitrogen, heating to 60-100 ℃, and stirring for reacting for 2-6 hours to obtain the long-chain small-molecule polyamine.
3. The method of claim 2, wherein the N, N-dimethyl aliphatic amine in step (1) is a tertiary aliphatic amine, and the alkyl group in the substituent is an alkyl group having 12 to 16 carbon atoms.
4. The method for preparing long-chain small-molecule polyamine according to claim 2, wherein the molar ratio of N, N-dimethyl aliphatic amine to 3-chloropropene in the step (1) is 1 (1-10).
5. The method for preparing long-chain small-molecule polyamine according to claim 4, wherein the molar ratio of N, N-dimethyl aliphatic amine to 3-chloropropene in the step (1) is 1 (4-8).
6. The method of claim 2, wherein the alcohol solution in step (1) is selected from the group consisting of ethanol, isopropanol, n-propanol, n-butanol, isobutanol, and isoamyl alcohol.
7. The method of claim 2, wherein the molar ratio of the alcohol solution to the N, N-dimethyl aliphatic amine is (1-5): 1.
8. the method of claim 2, wherein the initiator used in step (2) is potassium persulfate or sodium persulfate.
9. The method of claim 2, wherein the amount of the initiator used in step (2) is 0.05 to 1% by mass based on the mass of the intermediate obtained in step (1).
10. By using
As a clay stabilizer.
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