CN114316133A - Polyacrylamide composition with enhanced coordination effect - Google Patents
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Abstract
The invention provides a polyacrylamide composition with enhanced coordination effect, which consists of polyacrylamide and a diamine coordination reagent. The polyacrylamide composition provided by the invention comprises boron-containing polyacrylamide and an amino-containing coordination reagent, and a special coordination cross-linking structure can be formed through the coordination effect of the boron-containing polyacrylamide and the amino-containing coordination reagent, so that a network structure formed by the polyacrylamide in an aqueous solution can be effectively supplemented, the interaction between polyacrylamide molecular chains is enhanced, and the tackifying capability and the anti-shearing capability of the solution can be obviously enhanced. The polyacrylamide composition provided by the invention has excellent performance, and the preparation method is simple and convenient, and does not need high cost, so that the polyacrylamide composition has wide application prospect.
Description
Technical Field
The invention relates to the field of polyacrylamide, and particularly relates to a polyacrylamide composition with a coordination enhancing effect.
Background
The water-soluble high-molecular polyacrylamide is one of important chemical products, and is mainly used in various fields of water treatment, crude oil exploitation, papermaking, thickening and the like. The use of polyacrylamide is mainly dependent on its strong ability to viscosify aqueous solutions, which is derived from the relatively high molecular weight and excellent hydrophilicity of polyacrylamide. Therefore, the increasing demand for the thickening ability of polyacrylamide is a necessary way to improve the application performance. However, polyacrylamide is a flexible chain, and is easily disentangled under the action of shear, so that the viscosity is reduced, and therefore, how to enhance the network structure of the polymer solution and increase the viscosity becomes a focus of research attention.
The principle of introducing a hydrophobic group into a polymer chain of polyacrylamide is that a hydrophobic association structure similar to a micelle appears in a polyacrylamide aqueous solution by introducing a hydrophobic side chain into the polymer chain, so that a crosslinking point is formed, and the shear resistance of the solution is improved. However, the hydrophilicity of the hydrophobically associating type polyacrylamide is affected, and thus the dissolution conditions are more severe.
Therefore, how to effectively supplement the network structure in the polyacrylamide solution and further improve the tackifying capability and the anti-shearing capability of the polyacrylamide solution becomes a difficult point in the current research.
Disclosure of Invention
In order to solve the defects of polyacrylamide products in the aspects of viscosity increasing, shear resistance and the like, the invention aims to provide a polyacrylamide composition with an enhanced coordination effect, and through the coordination effect of boron on polyacrylamide molecular chains and a diamine coordination reagent, a coordination crosslinking structure which can be recovered after shearing can be formed among polymer molecular chains, so that a network structure in a polymer aqueous solution can be effectively supplemented, and the viscosity increasing capability and the shear resistance capability of the polyacrylamide products are obviously improved.
The polyacrylamide composition with the enhanced coordination effect provided by the invention consists of polyacrylamide and a bisamine coordination reagent, wherein the comonomer for forming the polyacrylamide comprises the following components in parts by weight: 20-60 parts of acrylamide, 0.5-10 parts of a boron-containing comonomer and 1-15 parts of other comonomers, wherein the boron-containing comonomer is selected from one or more of 4-vinylbenzene boric acid, 3-vinylbenzene boric acid and 2-vinylbenzene boric acid, and the other comonomers are selected from one or more of an anionic monomer, a cationic monomer and a nonionic monomer; the molar ratio of the diamine coordination reagent to the boron-containing comonomer is 1-1.2: 1 selected from one or more of 1, 10-diaminodecane, 1, 11-diaminoundecane, 1, 12-diaminododecane. The polyacrylamide composition with the enhanced coordination effect comprises boron-containing polyacrylamide and a coordination reagent containing two terminal amino groups, wherein a boron atom has a vacant orbit, and the amino group contains a nitrogen atom containing lone pair electrons. As shown in fig. 1, when polyacrylamide is dissolved in water to form a polymer solution, the empty orbit of the boron atom coordinates with the lone pair of electrons of the nitrogen atom to form a cross-linked structure which can be sheared and restored, so as to strengthen the intermolecular interaction and improve the network strength in the polymer aqueous solution, thereby significantly improving the viscosity of the polyacrylamide product in the aqueous solution and improving the shear resistance of the polymer solution, and thus providing a novel polyacrylamide product with excellent performance.
In the polyacrylamide composition with the enhanced coordination effect, the viscosity average molecular weight of polyacrylamide is 1000-3000 ten thousand. In some preferred embodiments, the polyacrylamide has a viscosity average molecular weight of 1000 to 2000 ten thousand. In some more preferred embodiments, the polyacrylamide has a viscosity average molecular weight of 1300 to 2000 ten thousand.
In the polyacrylamide composition with enhanced coordination effect provided by the invention, the raw materials such as the boron-containing comonomer, the diamine coordination reagent and the like can be commercial products, and can also be prepared by referring to the existing documents.
In some preferred embodiments, the polyacrylamide comprises the following comonomers in parts by weight: 30-50 parts of acrylamide, 1-5 parts of boron-containing comonomer and 5-10 parts of other comonomers.
In the polyacrylamide composition with the enhanced coordination effect, the anionic monomer, the cationic monomer and the nonionic monomer can be any common type used in the preparation of polyacrylamide products.
In some preferred embodiments, the anionic monomer is selected from one or more of acrylic acid, methacrylic acid, vinylsulfonic acid, p-vinylbenzenesulfonic acid, maleic acid, 2-acrylamido-2-methylpropanesulfonic acid, and their respective alkali metal and ammonium salts.
In some preferred embodiments, the cationic monomer is selected from one or more of methacryloyloxyethyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride, acryloyloxyethyl trimethyl ammonium chloride.
In some preferred embodiments, the nonionic monomer is selected from one or more of dimethylacrylamide, diethylacrylamide, methylolacrylamide, hydroxyethylacrylamide, vinylpyrrolidone.
In some preferred embodiments, the polyacrylamide composition with enhanced complexation is prepared by the following process:
s1: adding the acrylamide, the boron-containing comonomer and other comonomers into water (such as 50-80 parts of deionized water, preferably 60-70 parts of deionized water) to prepare a polymerization solution, and adjusting the pH value to 6-8 (such as using NaOH solution for adjustment);
s2: controlling the temperature of the polymerization liquid to be 0-5 ℃, and adding an oxidant and a reducing agent into the polymerization liquid to carry out polymerization reaction under the protection of inert gas; and
s3: after the polymerization reaction is finished (for example, the polymerization reaction lasts for about 8 to 12 hours), the obtained colloid is taken out, the bisamine coordination reagent is added into the colloid, and the colloid is granulated, dried and crushed.
In some preferred embodiments, the polymerization solution prepared in step S1 further includes 0.00025 to 0.0005 parts by weight of tetrasodium ethylenediaminetetraacetate.
In some preferred embodiments, the oxidant in step S2 is selected from ammonium persulfate in an amount of 0.001-0.0025 parts by weight.
In some preferred embodiments, the reducing agent in step S2 is selected from sodium bisulfite, and the amount of the reducing agent is 0.001 to 0.0025 parts by weight.
The polyacrylamide composition with the enhanced coordination function has excellent shear resistance and tackifying capability in aqueous solution, and is expected to be widely used in the fields of sewage treatment, sludge treatment, aqueous solution tackifying, thickening, oil field construction and the like. For example, the present invention provides a polyacrylamide composition at a concentration of 2000 ppm in 10000 mg/L sodium chloride brine at 75 ℃ for 10S-1Viscosity at shear rate greater than 37 mPaS at 170S-1The high shear rate of (3) is followed by 5 minutes of shear and after 5 minutes of recovery, the viscosity recovery can be greater than 90%.
The polyacrylamide composition product with the enhanced coordination function provided by the invention is a particle or powder polymer product, and the solid content is more than 89%.
The polyacrylamide composition with the enhanced coordination effect comprises boron-containing polyacrylamide and an amino-containing coordination reagent, and a special coordination cross-linking structure can be formed through the coordination effect of the boron-containing polyacrylamide and the amino-containing coordination reagent, so that a network structure formed by the polyacrylamide in an aqueous solution can be effectively supplemented, the interaction between polyacrylamide molecular chains is enhanced, and the tackifying capability and the anti-shearing capability of the solution can be obviously enhanced.
The polyacrylamide composition with the enhanced coordination effect has excellent performance, and the preparation method is simple and convenient, does not need high cost, and has wide application prospect.
Drawings
FIG. 1 is a schematic representation of the coordination of a polyacrylamide composition of the present invention with enhanced coordination;
FIG. 2 is a nuclear magnetic hydrogen spectrum of polyacrylamide prepared in example 1 of the present invention;
FIG. 3 is a nuclear magnetic hydrogen spectrum of polyacrylamide prepared in example 2 of the present invention;
FIG. 4 is a nuclear magnetic hydrogen spectrum of polyacrylamide prepared in example 3 of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following specific examples.
The starting materials or reagents used in the examples of the present invention and comparative examples are commercially available products unless otherwise specified.
The percentages used in the examples of the present invention and the comparative examples are mass percentages unless otherwise specified.
EXAMPLE 1 preparation of Polyacrylamide compositions
The following raw material components are used in parts by weight:
(1) 30 parts of acrylamide;
(2) 10 parts of acrylic acid;
(3) 1 part of 4-vinylphenylboronic acid;
(4) 0.00025 part of tetrasodium ethylenediaminetetraacetate;
(5) 50 parts of deionized water;
the raw material components are uniformly mixed and dissolved to form a polymerization solution, the pH value is adjusted to 7.0 by 32 percent sodium hydroxide solution, the polymerization solution is added into a reaction kettle, the stirring is started, the system temperature is controlled to be 0 ℃, nitrogen is introduced to remove oxygen until the oxygen content in the reaction kettle is lower than 0.15 percent. Respectively dissolving 0.001 part of ammonium persulfate and 0.0015 part of sodium bisulfite in 0.5 part of deionized water to prepare solutions, sequentially adding the solutions into a reaction kettle, introducing nitrogen until the viscosity of the system is obviously increased, continuing the polymerization reaction for about 10 hours, raising the temperature of the polymerization system to indicate that the reaction is finished, then preserving the temperature for 2 hours, discharging the obtained colloid, sampling and testing, adding 1.16 parts of 1, 10-diaminodecane (the molar ratio of the 1, 10-diaminodecane to 4-vinylphenylboronic acid is 1: 1) into the colloid, granulating, drying and crushing at 85-90 ℃ for later use, wherein the solid content of the product is shown in table 1.
The nuclear magnetic hydrogen spectrum of the polyacrylamide obtained in example 1 is shown in FIG. 2, and the molecular weight is shown in Table 1.
EXAMPLE 2 preparation of Polyacrylamide compositions
The following raw material components are used in parts by weight:
(1) 40 parts of acrylamide;
(2) 5 parts of dimethyldiallylammonium chloride;
(3) 2.5 parts of 3-vinylphenylboronic acid;
(4) 0.0003 part of tetrasodium ethylenediaminetetraacetate;
(5) 70 parts of deionized water;
the raw material components are uniformly mixed and dissolved to form a polymerization solution, the pH value is adjusted to 7.0 by 32 percent sodium hydroxide solution, the polymerization solution is added into a reaction kettle, the stirring is started, the system temperature is controlled to be 0 ℃, nitrogen is introduced to remove oxygen until the oxygen content in the reaction kettle is lower than 0.15 percent. Respectively dissolving 0.0025 part of ammonium persulfate and 0.0025 part of sodium bisulfite in 0.5 part of deionized water to prepare solutions, sequentially adding the solutions into a reaction kettle, introducing nitrogen until the viscosity of the system is obviously increased, continuing the polymerization reaction for about 8 hours, raising the temperature of the polymerization system to indicate that the reaction is finished, then preserving the temperature for 3 hours, discharging the obtained colloid, sampling and testing, adding 3.14 parts of 1, 11-diaminoundecane (the molar ratio of the 1, 11-diaminoundecane to 3-vinylphenylboronic acid is 1: 1) into the colloid, granulating, drying and crushing at 85-90 ℃ for later use, wherein the solid content of the product is shown in table 1.
The nuclear magnetic hydrogen spectrum of the polyacrylamide obtained in example 2 is shown in FIG. 3, and the molecular weight is shown in Table 1.
EXAMPLE 3 preparation of Polyacrylamide compositions
The following raw material components are used in parts by weight:
(1) 50 parts of acrylamide;
(2) 5 parts of dimethylacrylamide;
(3) 5 parts of 2-vinylphenylboronic acid;
(4) 0.0005 part of tetrasodium ethylenediaminetetraacetate;
(5) 80 parts of deionized water;
the raw material components are uniformly mixed and dissolved to form a polymerization solution, the pH value is adjusted to 7.0 by 32 percent sodium hydroxide solution, the polymerization solution is added into a reaction kettle, the stirring is started, the system temperature is controlled to be 0 ℃, nitrogen is introduced to remove oxygen until the oxygen content in the reaction kettle is lower than 0.15 percent. Respectively dissolving 0.0015 part of ammonium persulfate and 0.002 part of sodium bisulfite in 0.5 part of deionized water to prepare solutions, sequentially adding the solutions into a reaction kettle, introducing nitrogen until the viscosity of the system is obviously increased, continuing the polymerization reaction for about 12 hours, raising the temperature of the polymerization system to indicate that the reaction is finished, then preserving the temperature for 2.5 hours, discharging the obtained colloid, sampling and testing, adding 6.76 parts of 1, 12-diaminododecane (the molar ratio of the 1, 12-diaminododecane to 2-vinylphenylboronic acid is 1: 1) into the colloid, granulating, drying at 85-90 ℃ and crushing for later use, wherein the solid content of the product is shown in table 1.
The nuclear magnetic hydrogen spectrum of the polyacrylamide obtained in example 3 is shown in FIG. 4, and the molecular weight is shown in Table 1.
Comparative example 1 preparation of ordinary Polyacrylamide
Unmodified polyacrylamide product was prepared as in example 1 except that 4-vinylphenylboronic acid comonomer and 1, 10-diaminodecane were not added, and the raw material components and procedure were the same.
Comparative example 2 preparation of boron-containing Polyacrylamide
The composition and procedure of the starting materials were the same as in example 1 except that 1, 10-diaminodecane was not added, to obtain a boron-containing polyacrylamide product.
The polyacrylamide samples prepared in the above examples 1-3 and comparative examples 1-2 were mixed in 10000 mg/L sodium chloride brine to prepare 2000 ppm solution, and the solution was subjected to a Haake rotational rheometer at 75 ℃ for 10S-1The viscosity was measured at shear rate. Adding the solution at 170S-1At a high shear rate of (3) for 5 minutes, and after 5 minutes of recovery, at 75 ℃ for 10S-1The viscosity was measured at the shear rate, and the viscosity recovery was calculated, and the test data are shown in Table 1.
TABLE 1 results of Performance test of examples 1-3 and comparative examples 1-2
As can be seen from the results in Table 1, the polyacrylamide composition products obtained in examples 1 to 3 are significantly superior to those obtained in comparative examples 1 to 2 in both viscosity and shear resistance. The polyacrylamide product of comparative example 2, although including boron-containing copolymerized units, failed to form an effective coordination crosslinking structure due to the lack of a coordinating agent, and did not significantly improve the properties of the polymer.
Unless otherwise defined, all terms used herein have the meanings commonly understood by those skilled in the art.
The described embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of the present invention, and those skilled in the art may make various other substitutions, alterations, and modifications within the scope of the present invention, and thus, the present invention is not limited to the above-described embodiments but only by the claims.
Claims (10)
1. The polyacrylamide composition with the enhanced coordination effect is characterized by consisting of polyacrylamide and a bisamino coordination reagent, wherein the comonomer forming the polyacrylamide comprises the following components in parts by weight: 20-60 parts of acrylamide, 0.5-10 parts of a boron-containing comonomer and 1-15 parts of other comonomers, wherein the boron-containing comonomer is selected from one or more of 4-vinylbenzene boric acid, 3-vinylbenzene boric acid and 2-vinylbenzene boric acid, and the other comonomers are selected from one or more of an anionic monomer, a cationic monomer and a nonionic monomer; the molar ratio of the diamine coordination reagent to the boron-containing comonomer is 1-1.2: 1 selected from one or more of 1, 10-diaminodecane, 1, 11-diaminoundecane, 1, 12-diaminododecane.
2. The polyacrylamide composition according to claim 1 wherein said polyacrylamide has a viscosity average molecular weight of 1000 to 2000 ten thousand.
3. The polyacrylamide composition as defined in claim 1 wherein the comonomers forming the polyacrylamide comprise, in parts by weight: 30-50 parts of acrylamide, 1-5 parts of boron-containing comonomer and 5-10 parts of other comonomers.
4. The polyacrylamide composition of claim 1 wherein said anionic monomer is selected from one or more of acrylic acid, methacrylic acid, vinylsulfonic acid, p-vinylbenzenesulfonic acid, maleic acid, 2-acrylamido-2-methylpropanesulfonic acid, and their respective alkali metal and ammonium salts.
5. The polyacrylamide composition of claim 1 wherein said cationic monomer is selected from one or more of methacryloyloxyethyl trimethyl ammonium chloride, dimethyldiallylammonium chloride, acryloyloxyethyl trimethyl ammonium chloride.
6. The polyacrylamide composition as defined in claim 1 wherein said nonionic monomer is selected from one or more of dimethylacrylamide, diethylacrylamide, methylolacrylamide, hydroxyethylacrylamide, vinylpyrrolidone.
7. The polyacrylamide composition according to any one of claims 1-6 wherein said polyacrylamide composition is prepared by the process of:
s1: adding the acrylamide, the boron-containing comonomer and other comonomers into water to prepare a polymerization solution, and adjusting the pH value to be 6-8;
s2: controlling the temperature of the polymerization liquid to be 0-5 ℃, and adding an oxidant and a reducing agent into the polymerization liquid to carry out polymerization reaction under the protection of inert gas; and
s3: and after the polymerization reaction is finished, taking out the obtained colloid, adding the bisamine coordination reagent into the colloid, granulating, drying and crushing.
8. The polyacrylamide composition as defined in claim 7, wherein said polymerization solution prepared in step S1 further comprises 0.00025-0.0005 parts by weight of tetrasodium ethylenediaminetetraacetate.
9. The polyacrylamide composition as defined in claim 7, wherein the oxidant in step S2 is selected from ammonium persulfate in an amount of 0.001-0.0025 parts by weight.
10. The polyacrylamide composition as defined in claim 7, wherein the reducing agent in step S2 is selected from sodium bisulfite, and the amount is 0.001-0.0025 parts by weight.
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