CN114957551A - Preparation method of graft modified polyacrylamide - Google Patents
Preparation method of graft modified polyacrylamide Download PDFInfo
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- CN114957551A CN114957551A CN202210919014.8A CN202210919014A CN114957551A CN 114957551 A CN114957551 A CN 114957551A CN 202210919014 A CN202210919014 A CN 202210919014A CN 114957551 A CN114957551 A CN 114957551A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B30/00—Preparation of starch, degraded or non-chemically modified starch, amylose, or amylopectin
- C08B30/12—Degraded, destructured or non-chemically modified starch, e.g. mechanically, enzymatically or by irradiation; Bleaching of starch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
Abstract
The application relates to the technical field of polymer preparation, and particularly discloses a preparation method of graft modified polyacrylamide, which comprises the following steps: dissolving modified soluble starch and acrylamide in water, mixing, adding an initiator, introducing nitrogen to remove oxygen, heating to 40-50 ℃ to initiate reaction, and obtaining the graft modified polyacrylamide after the reaction is finished. The prepared graft modified polyacrylamide has good flocculation effect and high stability in the storage and transportation process, and can effectively reduce the condition of viscosity and flocculation effect reduction caused by polymer degradation in the storage and transportation process.
Description
Technical Field
The application relates to the technical field of polymer preparation, in particular to a preparation method of graft modified polyacrylamide.
Background
Polyacrylamide is a linear high molecular polymer, is a hard glassy solid at normal temperature, and products comprise glue solution, latex, white powder, semitransparent beads, sheets and the like. The polyacrylamide has good thermal stability and water solubility, and is widely applied to the fields of lubricants, suspending agents, clay stabilizers, fluid loss agents and thickening agents.
And the polyacrylamide is the most widely used oil displacement agent at present due to good water solubility and viscosity increasing performance. At present, a plurality of oil fields use polyacrylamide for tertiary oil recovery on a large scale, and the polyacrylamide is mainly used for improving the viscosity of injected fluid, improving the oil-water fluidity ratio, expanding the swept area of a displacement phase and achieving the purpose of improving the recovery ratio.
However, polyacrylamide has a tendency to degrade slowly after long-term storage, which leads to a decrease in solution viscosity and flocculation, especially when stored and transported under relatively poor conditions.
Disclosure of Invention
In order to improve the stability of polyacrylamide in the storage and transportation process, the application provides a preparation method of graft modified polyacrylamide.
The application provides a preparation method of graft modified polyacrylamide, which adopts the following technical scheme:
a preparation method of graft modified polyacrylamide comprises the following steps:
dissolving modified soluble starch and acrylamide in water, mixing, adding an initiator, introducing nitrogen to remove oxygen, heating to 40-50 ℃ to initiate reaction, and obtaining graft modified polyacrylamide after the reaction is finished;
the preparation method of the modified soluble starch comprises the following steps:
microwave treatment: dissolving soluble starch in a polyhydric alcohol aqueous solution to obtain soluble starch emulsion; under the state of keeping stirring, heating the soluble starch emulsion by microwave to obtain rough modified soluble starch;
and (3) post-treatment: washing the rough modified soluble starch by using ethanol, carrying out centrifugal operation after washing, and then sequentially drying, crushing and sieving to obtain the modified soluble starch.
By adopting the technical scheme, the modified soluble starch and the acrylamide are copolymerized to generate the copolymer with the dual characteristics of natural polymer and synthetic polymer. And hydrophilic and semi-rigid modified soluble starch macromolecules are used as a framework, flexible polyacrylamide is used as a branched chain, and the overall structure stability is good due to the abundant network structure, so that the condition that the viscosity and the flocculation effect are reduced due to polymer degradation in the storage and transportation process can be effectively reduced. Meanwhile, the copolymer obtained by graft modification has hydroxyl and amide groups and is of a branched structure, so that the flocculation effect of the graft modified polyacrylamide is better.
In addition, the graft modified polyacrylamide can be fully swelled in water, and the swelled graft modified polyacrylamide has larger molecular space volume and fine and long branched chains, so that the structure endows the graft modified polyacrylamide with stronger flocculation capability and stronger adaptability.
And compared with polyacrylamide, the hydrophilic groups on the graft-modified polyacrylamide are further increased, namely the dissolution rate of the graft-modified polyacrylamide is better, and the graft-modified polyacrylamide is suitable for being used in multiple environments.
Because the soluble starch can be well dissolved in boiling water, the soluble starch needs to be dissolved in the boiling water in advance before the soluble starch and the acrylamide are mixed, and then the soluble starch and the acrylamide can be mixed after the soluble starch is cooled, so that the whole operation is complex. And the solubility of the soluble starch in boiling water is also general, and the method has certain limitation on the easy generation of a grafting reaction.
In order to solve the above problems, soluble starch is well soluble in cold water, and the solubility of soluble starch is further improved. The method is characterized in that the soluble starch is modified by adopting a microwave treatment mode, and the polyol aqueous solution is used as a solvent for auxiliary modification, so that the microstructure of the soluble starch is changed, and the modified soluble starch has good solubility in cold water after actual verification. The solubility of the modified soluble starch is improved to a certain extent along with the temperature rise, namely the obtained modified soluble starch has better application effect in the grafting reaction, the reaction operation is simplified, and the solubility of the modified soluble starch in the system is further improved, so that the method has obvious positive significance for the grafting reaction effect.
In a specific embodiment, the reaction system for modifying the soluble starch and the acrylamide further comprises a cross-linking agent, and the cross-linking agent comprises at least one of hydroxyethyl methacrylate, hydroxypropyl methacrylate, divinylbenzene, N-methylol acrylamide and diacetone acrylamide.
By adopting the technical scheme, a proper amount of cross-linking agent is added into a reaction system of the modified soluble starch and the acrylamide, and a net structure formed in a structure of the grafted modified polyacrylamide is increased, so that the structural stability of the grafted modified polyacrylamide is further improved, and the condition that the viscosity and the flocculation effect are reduced due to the degradation of the polymer in the storage and transportation process can be further reduced on the premise of no obvious negative influence on other properties of the grafted modified polyacrylamide.
In a specific possible embodiment, in the step of microwave treatment, the polyol aqueous solution is methyl propylene glycol and water in a mass ratio of 1: (1-4).
By adopting the technical scheme, the mass ratio of the methyl propylene glycol to the water is controlled to be 1: (1-4), the microwave modification effect is improved, and the finally obtained modified soluble starch is good in solubility.
In a specific embodiment, in the step of microwave treatment, the mass ratio of the soluble starch to the aqueous solution of polyol is 1: (4-9).
By adopting the technical scheme, the mass ratio of the soluble starch to the polyalcohol aqueous solution is controlled to be 1: (4-9), the microwave modification effect is improved, and the finally obtained modified soluble starch is good in solubility.
In a specific possible embodiment, in the post-treatment step, the crude modified soluble starch which is washed by ethanol and centrifuged is added into water, the mixture is stirred and mixed, the pH value is adjusted to be alkaline, then 2-acrylamido-2-methylpropanesulfonic acid and acryloyloxyethyl trimethyl ammonium chloride are added, the mixture is heated to 30-50 ℃ for reaction, and after the reaction is finished, the finished modified soluble starch is obtained through washing, drying, crushing and sieving in sequence.
By adopting the technical scheme, the crude modified soluble starch which is washed by ethanol and subjected to centrifugal treatment is subjected to grafting reaction with 2-acrylamide-2-methylpropanesulfonic acid and acryloyloxyethyl trimethyl ammonium chloride, so that an anionic hydrophilic group and a cationic hydrophilic group are introduced into the crude modified soluble starch which is washed by ethanol and subjected to centrifugal treatment, an inner salt structure is formed, particularly a sulfonic acid group, an amide group and a quaternary ammonium group, metal ions can be chelated well, and the modified soluble starch is endowed with good salt resistance and temperature resistance. In addition, the solubility of the modified soluble starch is further improved due to the introduction of the anionic hydrophilic group and the cationic hydrophilic group. And the amido can be promoted to be hydrolyzed into carboxyl under the high temperature condition, the negative charge density on the molecular chain of the modified water-soluble starch is improved, and the viscosity is improved along with the negative charge density. Meanwhile, the modified soluble starch structurally introduces both anionic hydrophilic groups and cationic hydrophilic groups, so that the modified water-soluble starch keeps a state close to electric neutrality, and the condition of generating precipitation can be effectively avoided. And the anionic groups in the molecules can play a certain role in protecting cationic groups, and electrically repel the high-activity hetero anions existing in the system, so that the anionic groups in the modified soluble starch cannot be prematurely reacted or neutralized.
In addition, the positive meanings of introducing the anionic hydrophilic group and the cationic hydrophilic group to the modified soluble starch can be finally embodied on the graft modified polyacrylamide, so that the performance of the graft modified polyacrylamide is further optimized. And part of the introduced anionic hydrophilic groups and cationic hydrophilic groups can be connected with flexible polyacrylamide branched chains in a copolymerization mode in the acrylamide copolymerization process, so that a denser and stable network structure is promoted to be formed, and the finally obtained graft modified polyacrylamide has better structural stability.
In a specific embodiment, in the post-treatment step, the pH is adjusted to 9-12 after mixing and stirring.
By adopting the technical scheme, the pH is adjusted to 9-12 after mixing and stirring are controlled, and the reaction conditions are optimized, so that the effect of introducing the anionic hydrophilic groups and the cationic hydrophilic groups into the rough modified soluble starch which is washed by ethanol and subjected to centrifugal treatment is improved.
In a specific possible embodiment, in the post-treatment step, the mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid to the acryloyloxyethyltrimethyl ammonium chloride is (2-4): 1.
By adopting the technical scheme, the mass ratio of the 2-acrylamide-2-methylpropanesulfonic acid to the acryloyloxyethyl trimethyl ammonium chloride is controlled to be (2-4): 1, and the reaction conditions are optimized, so that the effect of introducing the anionic hydrophilic group and the cationic hydrophilic group into the coarse modified soluble starch which is washed by ethanol and subjected to centrifugal treatment is improved.
In a specific possible embodiment, in the post-treatment step, the mass ratio of the total mass of the 2-acrylamido-2-methylpropanesulfonic acid and acryloyloxyethyltrimethyl ammonium chloride to the mass of the soluble starch is 1: (10-15).
By adopting the technical scheme, the mass ratio of the total mass of the 2-acrylamide-2-methylpropanesulfonic acid and the acryloyloxyethyl trimethyl ammonium chloride to the soluble starch is controlled to be 1: (10-15), optimizing reaction conditions, and thus improving the effect of introducing anionic hydrophilic groups and cationic hydrophilic groups into the coarse modified soluble starch which is washed by ethanol and subjected to centrifugal treatment.
In summary, the present application has the following beneficial effects:
1. according to the preparation method, the copolymer with the dual characteristics of natural polymers and synthetic polymers is generated by copolymerizing the modified soluble starch and acrylamide, and the overall structure stability is good due to the abundant network structure, so that the condition that the viscosity and the flocculation effect are reduced due to polymer degradation in the storage and transportation process can be effectively reduced; meanwhile, the copolymer obtained by graft modification has better flocculation effect, adaptability and dissolution rate, and is suitable for the use of graft modified polyacrylamide in a plurality of environments.
2. The application further carries out modification treatment on the soluble starch in a microwave treatment mode, the obtained modified soluble starch also has better solubility in cold water, the technical limitation that the soluble starch needs to be dissolved in advance by using boiling water can be effectively overcome, and the modification has obvious positive significance on the effect of the grafting reaction because the solubility of the modified soluble starch in a system is further improved.
3. According to the application, an anionic hydrophilic group and a cationic hydrophilic group are further introduced to the structure of the modified soluble starch to form an inner salt structure, particularly a sulfonic acid group, an amide group and a quaternary ammonium group, so that metal ions can be chelated well, and the modified soluble starch is endowed with good salt resistance and temperature resistance; and the modified soluble starch introduced with the anionic hydrophilic group and the cationic hydrophilic group has a more stable structure, and the positive significance of the modification treatment of the modified soluble starch is fed back to the grafted modified polyacrylamide.
Detailed Description
The present application will be described in further detail with reference to the following preparations, examples and comparative examples, and the starting materials to which the present application relates are commercially available, wherein acryloyloxyethyltrimethylammonium chloride has a CAS number of 44992-01-0;
the sweet potato soluble starch is purchased from Jiangsu Caoswei Biotechnology Limited, and has a product number of JS 20201225.
Preparation example of modified soluble starch
Preparation example 1
A preparation method of modified soluble starch comprises the following steps:
a1 microwave treatment: 1kg of sweet potato soluble starch is dissolved in 6kg of polyhydric alcohol aqueous solution, wherein the polyhydric alcohol aqueous solution is prepared by mixing methyl propylene glycol and water according to the mass ratio of 1:1, mixing and stirring the mixed solution to obtain soluble starch emulsion; heating the soluble starch emulsion with microwave under stirring, heating at 70 deg.C for 30min, standing, and removing supernatant to obtain crude modified soluble starch;
a2 post-treatment: and repeatedly washing the crude modified soluble starch twice by using absolute ethyl alcohol, carrying out centrifugal operation after washing, and then sequentially drying, crushing and sieving to obtain the modified soluble starch.
Preparation example 2
The present preparation example is different from preparation example 1 in that in the step of A1 microwave treatment, the mass ratio of methylpropanediol to water was 1: 4.
Preparation example 3
The present preparation example is different from preparation example 1 in that in the step of A1 microwave treatment, the mass ratio of methylpropanediol to water was 1: 2.
Preparation example 4
The present preparation example differs from preparation example 1 in that the mass of the soluble starch was 1kg and the mass of the aqueous polyol solution was 4kg in the A1 microwave treatment step.
Preparation example 5
The present preparation example differs from preparation example 1 in that the mass of the soluble starch was 1kg and the mass of the aqueous polyol solution was 9kg in the A1 microwave treatment step.
Preparation example 6
The difference between the present preparation example and preparation example 1 is that in the post-treatment step of a2, the crude modified soluble starch was washed twice with absolute ethanol and centrifuged after washing; and adding the coarse modified soluble starch which is washed by absolute ethyl alcohol and is subjected to centrifugal treatment into water, mixing and stirring, adjusting the pH to 11 by using lime, adding 0.075kg of 2-acrylamide-2-methylpropanesulfonic acid and 0.025kg of acryloyloxyethyl trimethyl ammonium chloride, heating to 50 ℃ for reaction, and after 10 hours of reaction, sequentially washing, drying, crushing and sieving to obtain the finished product modified soluble starch.
Preparation example 7
This preparation example differs from preparation example 6 in that in the A2 post-treatment step, the pH was adjusted to 9 with lime after mixing and stirring.
Preparation example 8
This preparation example differs from preparation example 6 in that in the A2 post-treatment step, the pH was adjusted to 12 with lime after mixing and stirring.
Preparation example 9
This preparation example differs from preparation example 6 in that in the A2 post-treatment step, the total mass of 2-acrylamido-2-methylpropanesulfonic acid and acryloyloxyethyltrimethyl ammonium chloride was 0.07kg, and the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid to acryloyloxyethyltrimethyl ammonium chloride was 3: 1.
Preparation example 10
This preparation example differs from preparation example 6 in that in the A2 post-treatment step, the total mass of 2-acrylamido-2-methylpropanesulfonic acid and acryloyloxyethyltrimethyl ammonium chloride was 1kg, and the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid to acryloyloxyethyltrimethyl ammonium chloride was 2: 1.
Preparation example 11
This preparation example differs from preparation example 6 in that in the A2 post-treatment step, the total mass of 2-acrylamido-2-methylpropanesulfonic acid and acryloyloxyethyltrimethyl ammonium chloride was 1kg, and the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid to acryloyloxyethyltrimethyl ammonium chloride was 4: 1.
Preparation example 12
This preparation differs from preparation 6 in that in the A2 work-up step, no 2-acrylamido-2-methylpropanesulfonic acid was added, i.e.only 0.1kg of acryloyloxyethyltrimethylammonium chloride was added.
Preparation example 13
This preparation differs from preparation 6 in that in the A2 work-up step, no acryloyloxyethyltrimethylammonium chloride was added, i.e.only 0.1kg of 2-acrylamido-2-methylpropanesulfonic acid was added.
Comparative preparation example 1
The present comparative preparation example differs from preparation example 1 in that in the step of microwave treatment a1, the microwave heating was replaced with ordinary heating.
Comparative preparation example 2
This comparative preparation differs from preparation 1 in that the aqueous polyol solution was replaced with an equal amount of aqueous solution.
Example 1
A preparation method of graft modified polyacrylamide comprises the following steps:
dissolving 1kg of modified soluble starch and 2kg of acrylamide in 20L of water, mixing and stirring, adding 1L of 0.01g/L potassium permanganate initiator, introducing nitrogen to remove oxygen, heating to 40 ℃ to initiate reaction, and reacting for 3 hours to obtain graft modified polyacrylamide;
wherein the modified soluble starch is prepared in preparation example 1.
Example 2
A preparation method of graft modified polyacrylamide comprises the following steps:
dissolving 1kg of modified soluble starch and 2kg of acrylamide in 20L of water, adding 0.005kg of cross-linking agent, mixing and stirring, adding 1L of 0.01g/L potassium permanganate initiator, introducing nitrogen to remove oxygen, heating to 40 ℃ for initiating reaction, and reacting for 3 hours to obtain graft modified polyacrylamide; wherein the cross-linking agent is a mixture of hydroxypropyl methacrylate and N-hydroxymethyl acrylamide according to the mass ratio of 1:1, and the modified soluble starch is prepared in preparation example 1.
Examples 3 to 16 differ from example 1 in that the modified soluble starches used in the respective examples were prepared by different preparation examples, the other preparation conditions were the same as in example 1, and the specific correspondence is shown in the following table:
TABLE 1 comparison Table
Example 17
This example differs from example 1 in that the modified soluble starch obtained in preparation example 1 was replaced with an equal amount of sweet potato soluble starch.
Comparative example
Comparative example 1
A preparation method of polyacrylamide comprises the following steps:
s1 liquid preparation: mixing and stirring 800g of water, 100g of cationic monomer and 800g of acrylamide, adding calcium hydroxide powder after the acrylamide is completely dissolved, and adjusting the pH to 8 to obtain a preparation solution;
polymerization of S2: sequentially adding 1000g of initiator into the prepared solution, standing, heating, solidifying, expanding and carrying out instantaneous implosion reaction to obtain a polymer expansion body;
s3 post-processing: sequentially granulating, drying and screening the polymer expansion body to obtain polyacrylamide;
wherein the initiator is sulfite aqueous solution with the concentration of 2wt%, and the cationic monomer is dimethyl diallyl ammonium chloride.
Performance detection test method
And (3) detecting the solubility: the modified soluble starches obtained in preparation examples 1 to 13 and comparative preparation examples 1 to 2 were used as samples. Mixing 100ml of distilled water at 25 ℃ with 1g of modified soluble starch sample at room temperature, stirring for 15s at the rotation speed of 400rpm, adjusting the rotation speed to 1000rpm, stirring for 2min, transferring the modified soluble starch solution into a 250ml centrifuge cup, centrifuging for 15min at the rotation speed of 3100rpm, sucking 25ml of supernatant, adding the supernatant into a weighed weighing bottle, drying at 110 ℃ for 6h, and weighing. The solubility calculation formula is as follows:
solubility (%) = (solid weight in 25ml liquid × 4/total sample weight) × 100%.
Table 2 modified soluble starch test data table
And (3) detecting the dissolution speed: using the graft-modified polyacrylamides obtained in examples 1 to 17 and the polyacrylamide of comparative example 1 as test samples, 3.5g of the test samples were slowly and uniformly added to 1L of water at 25 ℃ over 30 seconds, and then stirred at 20rpm, and when no insoluble matter was observed, the test samples were regarded as completely dissolved, and the time required for complete dissolution was recorded.
And (3) stability detection: the graft modified polyacrylamide obtained in examples 1-17 and the polyacrylamide of comparative example 1 were used as test samples, respectively, and the concentrations of the test samples were 1.5g/L in an aqueous solution with a total mineralization degree of 19334mg/L and a total amount of calcium ions and magnesium ions of 514mg/L, at 65 ℃ for 7.34s -1 The apparent viscosity of the solution after standing for 0h, 6h and 24h was measured.
TABLE 3 Polyacrylamide test data sheet
According to the detection data in tables 2 and 3, in combination with the solubilities of the preparation examples and the comparative preparation examples of the modified soluble starch, the solubility of the modified soluble starch subjected to microwave modification treatment in cold water is excellent, and the coordination effect of the polyol solution in the modification treatment process is obvious.
The application of the modified soluble starch to the graft modification of polyacrylamide has a positive effect on the dissolution rate of the product, as seen in the test data of the examples and comparative examples. And from the change of the apparent viscosity of 0h, 6h and 24h of the graft modified polyacrylamide or polyacrylamide, the graft modified polyacrylamide prepared by using the modified soluble starch as a raw material has better stability and lower natural degradation degree. And an anionic hydrophilic group and a cationic hydrophilic group are introduced after microwave treatment, so that the effect of further improving the structural stability of the final graft modified polyacrylamide is achieved, and the dissolution speed is higher. In addition, the addition of the crosslinking agent has a remarkable effect on the improvement of the apparent viscosity of the polymer, but affects the dissolution rate of the polymer to some extent.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The preparation method of the graft modified polyacrylamide is characterized by comprising the following steps:
dissolving modified soluble starch and acrylamide in water, mixing, adding an initiator, introducing nitrogen to remove oxygen, heating to 40-50 ℃ to initiate reaction, and obtaining graft modified polyacrylamide after the reaction is finished;
the preparation method of the modified soluble starch comprises the following steps:
microwave treatment: dissolving soluble starch in a polyhydric alcohol aqueous solution to obtain soluble starch emulsion; heating the soluble starch emulsion by microwave under the state of keeping stirring to obtain rough modified soluble starch;
and (3) post-treatment: washing the rough modified soluble starch by using ethanol, carrying out centrifugal operation after washing, and then sequentially drying, crushing and sieving to obtain the modified soluble starch.
2. The method for preparing the graft-modified polyacrylamide according to claim 1, wherein the reaction system of the modified soluble starch and the acrylamide further comprises a cross-linking agent, and the cross-linking agent comprises at least one of hydroxyethyl methacrylate, hydroxypropyl methacrylate, divinylbenzene, N-methylol acrylamide and diacetone acrylamide.
3. The method for preparing graft-modified polyacrylamide according to claim 1, wherein in the step of microwave treatment, the aqueous solution of polyol is methyl propylene glycol and water in a mass ratio of 1: (1-4).
4. The method for preparing the graft-modified polyacrylamide according to claim 1, wherein in the step of microwave treatment, the mass ratio of the soluble starch to the aqueous solution of the polyhydric alcohol is 1: (4-9).
5. The preparation method of the graft-modified polyacrylamide according to claim 1, wherein in the post-treatment step, the crude modified soluble starch which is washed by ethanol and centrifuged is added into water, the mixture is stirred and then the pH value is adjusted to be alkaline, then 2-acrylamido-2-methylpropanesulfonic acid and acryloyloxyethyl trimethyl ammonium chloride are added, the mixture is heated to 30-50 ℃ for reaction, and after the reaction is finished, the finished product modified soluble starch is obtained through washing, drying, crushing and sieving in sequence.
6. The preparation method of the graft-modified polyacrylamide according to claim 5, wherein in the post-treatment step, the pH is adjusted to 9-12 after mixing and stirring.
7. The preparation method of the graft-modified polyacrylamide according to claim 5, wherein in the post-treatment step, the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid to acryloyloxyethyltrimethyl ammonium chloride is (2-4): 1.
8. The method for preparing the graft-modified polyacrylamide according to claim 7, wherein in the post-treatment step, the mass ratio of the total mass of the 2-acrylamido-2-methylpropanesulfonic acid and the acryloyloxyethyltrimethyl ammonium chloride to the mass of the soluble starch is 1: (10-15).
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