Anionic polyacrylamide solution as well as preparation method and application thereof
By combining specific types of stabilizing masking agents and viscosity reducers, the stability problem of anionic polyacrylamide solutions has been solved, achieving long-term viscosity maintenance and improved treatment effect at room temperature, making it suitable for various water treatment applications.
Patent Information
- Application Number
- CN202510952526.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-10
- Publication Date
- 2025-10-17
AI Technical Summary
Existing anionic polyacrylamide (APAM) solutions have problems such as poor stability, large viscosity loss, and high cost during water treatment, resulting in reduced treatment effect and waste of reagents.
A specific type of stabilizing masking agent and viscosity reducer, including glycerol, urea, citric acid, etc., is used in combination with a specific type of complexing agent and zeolite to form an anionic polyacrylamide solution to improve its stability and viscosity retention ability.
Anionic polyacrylamide solution can remain stable at room temperature for more than 30 days, maintaining good flocculation, decolorization and filtration properties. It is suitable for polyacrylamide from different manufacturers and models, and has great applicability and a simple preparation process.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of wastewater treatment, and particularly relates to an anionic polyacrylamide solution and a preparation method and application thereof. BACKGROUND
[0002] Polyacrylamide (PAM) is a general term for homopolymers of acrylamide or polymers obtained by copolymerization with other monomers, and is one of the most widely used varieties of water-soluble polymers. Due to the presence of amide groups in the structural units of polyacrylamide, hydrogen bonds are easily formed, which makes polyacrylamide have good water solubility and high chemical activity, and further allows various modified products with branched or network structures to be obtained through grafting or crosslinking. Therefore, PAM has a wide range of applications in the oil exploitation, water treatment, textile, papermaking, mineral processing, medicine, agriculture and other industries, and is known as a "universal aid".
[0003] Anionic PAM (APAM) has excellent performance in cleaning water bodies and purifying wastewater, and is of great significance for protecting the ecological environment and social production. Anionic polyacrylamide (APAM) is a water-soluble polymer with a white powder appearance and a molecular weight ranging from 6 million to 25 million. The anionic polyacrylamide (APAM) molecular chain contains polar groups, which can adsorb solid particles floating in water, bridge particles or agglomerate particles through charge, forming larger coagulants, thereby accelerating the settling of particles in the suspension. Due to its purification, settlement promotion, filtration promotion, concentration and other effects, APAM is widely used in various industries, especially in wastewater treatment, including the flocculation and sedimentation of various industrial wastewater such as steel plant wastewater, electroplating plant wastewater, metallurgical wastewater, copper mine wastewater, coal washing wastewater, and the purification treatment of drinking water. However, there are still some problems when APAM is applied in the field of water treatment. For example, due to cost constraints, APAM is generally in the form of solid powder during distribution, and needs to be dissolved to a concentration of 0.1-0.2% before being applied to sewage and sludge treatment. However, during the dissolution and use process, due to water quality, water temperature, dissolution container, storage method, storage time and other reasons, the viscosity loss of APAM solution is large. Since the viscosity stability of polymer aqueous solution directly affects the water treatment effect, the decrease in viscosity will lead to a decrease in treatment effect, an increase in the amount of reagent used, an increase in cost and other problems.
[0004] The stability of the APAM solution is affected by various factors, including water quality, solution pH value, concentration, temperature, etc. The effective service life of the solution can be extended to a certain extent by adjusting the pH value of the solution, reducing the temperature, etc., but the effect is not great. Through the synthesis process of adding a functional monomer during the reaction process of changing the anionic polyacrylamide (APAM) polymerization reaction, the operation is cumbersome and the cost of the medicament is increased, which is not conducive to the actual production process. In addition, the storage time of the APAM solution is short. Generally speaking, the APAM solution can be stored for about 7 days. If the storage time exceeds the above-mentioned time, the solution is prone to degradation, which affects the use effect. Based on this, the APAM needs to be prepared on site during use, which not only puts pressure on the on-site manpower, but also causes the prepared APAM solution to be invalid due to machine downtime in the event of an emergency, resulting in waste of medicament.
[0005] Therefore, it is of great significance to provide an anionic polyacrylamide solution with good stability. SUMMARY
[0006] The present application aims to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice. Specifically, the present application provides an anionic polyacrylamide solution which has good stability and can exist in the form of a solution for more than 30 days, and has good flocculation, decolorization and filtration aid performance.
[0007] The inventive concept of the present application: the anionic polyacrylamide solution of the present application comprises polyacrylamide, a stable masking agent, a viscosity reducer and water; the stable masking agent comprises glycerol and substance A; the substance A comprises at least one of urea, sodium polyacrylate, zeolite and complexing agent; and the viscosity reducer comprises at least one of citric acid and citrate. The stable masking agent of the present application is compounded with a specific type of substance, and is combined with a specific type of viscosity reducer, so that the anionic polyacrylamide solution has good stability and can exist in the form of a solution for more than 30 days.
[0008] Therefore, the first aspect of the present application provides an anionic polyacrylamide solution.
[0009] Specifically, the anionic polyacrylamide solution comprises anionic polyacrylamide, a stable masking agent, a viscosity reducer and water;
[0010] The stable masking agent comprises glycerol and substance A; the substance A comprises at least one of urea, sodium polyacrylate, zeolite and complexing agent;
[0011] The viscosity reducer comprises at least one of citric acid and citrate.
[0012] Specifically, the stabilizing masking agent in the application adopts the combination of glycerol and substance A, which has a synergistic effect, and combined with a specific type of viscosity reducer, the components jointly act to make the anionic polyacrylamide solution have good stability. If any component is missing or the type of viscosity reducer is changed, the dynamic viscosity stability of the anionic polyacrylamide solution will be significantly reduced, that is, the stability will be reduced.
[0013] Preferably, the weight ratio of glycerol to substance A is 100:(18-220); further preferably, the weight ratio of glycerol to substance A is 100:(20-200).
[0014] Specifically, glycerol and substance A are matched in a specific ratio, which can further promote the synergistic effect between glycerol and substance A, and further improve the stability of the polyacrylamide solution.
[0015] Preferably, the citrate salt includes at least one of sodium citrate and potassium citrate.
[0016] Preferably, the anionic polyacrylamide solution includes anionic polyacrylamide 0.09-5.5%, stabilizing masking agent 0.09-1.1%, viscosity reducer 0.05-5.5%, and water 87.9-99.77% by weight percentage; further preferably, the anionic polyacrylamide solution includes anionic polyacrylamide 0.1-5%, stabilizing masking agent 0.1-1%, viscosity reducer 0.05-5%, and water 89-99.75% by weight percentage.
[0017] Specifically, the components in the anionic polyacrylamide solution need to be matched in a certain ratio, which is more conducive to the interaction between the components and improves the stability of the polyacrylamide solution.
[0018] Preferably, the molecular weight of the anionic polyacrylamide is ≤2200w; further preferably, the molecular weight of the anionic polyacrylamide is greater than or equal to 200w and less than or equal to 2000w.
[0019] Preferably, the hydrolysis degree of the anionic polyacrylamide is ≤80%; further preferably, the hydrolysis degree of the anionic polyacrylamide is 5-40%.
[0020] Preferably, the complexing agent comprises at least one of ethylenediaminetetraacetic acid (EDTA), disodium ethylenediaminetetraacetate (EDTA-2Na), trisodium ethylenediaminetetraacetate (EDTA-3Na), tetrasodium ethylenediaminetetraacetate (EDTA-4Na), chitosan, methylglycinediacetic acid (MGDA), nitrilotriacetic acid, trisodium nitrilotriacetate, diethylenetriaminepentaacetic acid (DTPA), penta-sodium diethylenetriaminepentaacetate (DTPA-5Na), N-hydroxyethyl ethylenediaminetriacetate (HEDTA), trisodium hydroxyethyl ethylenediaminetriacetate (HEDTA-3Na), sodium tripolyphosphate, pentamethylpiperidinol, sodium mercaptophenylpropylthiazolide.
[0021] Preferably, the zeolite comprises at least one of artificial zeolite, natural zeolite; further preferably, the zeolite comprises artificial zeolite.
[0022] The second aspect of the present application provides a preparation method of the anionic polyacrylamide solution of the first aspect of the present application.
[0023] Specifically, the preparation method of the anionic polyacrylamide solution comprises the following steps:
[0024] Mixing the raw material components to obtain the anionic polyacrylamide solution.
[0025] Preferably, the anionic polyacrylamide, the viscosity reducer and the water are mixed, and then the stabilizing masking agent is added to obtain the anionic polyacrylamide solution.
[0026] Further preferably, the anionic polyacrylamide solid powder and the viscosity reducer are added to water, and stirred at room temperature until the solid APAM particles are uniformly dissolved, and then the stabilizing masking agent is added while stirring to obtain the anionic polyacrylamide solution.
[0027] The third aspect of the present application provides an application of the anionic polyacrylamide solution in wastewater treatment.
[0028] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:
[0029] (1) The stabilizing masking agent of the present application is compounded with specific types of substances, and combined with specific types of viscosity reducers, so that the anionic polyacrylamide solution has good stability and can exist in the form of a solution at room temperature (25℃) for more than 30 days, and can maintain the flocculation, decolorization and filtration aid performance of the APAM solution for sewage and sludge.
[0030] (2) The present application has wide applicability and is suitable for polyacrylamides of different manufacturers and different models, and has good popularization.
[0031] (3) The preparation process is simple, and large-scale production and application are facilitated. DETAILED DESCRIPTION
[0032] In order to make the skilled in the art more clearly understand the technical solutions described in the present application, the following examples are listed for illustration. It should be pointed out that the following examples do not constitute a limitation on the scope of protection required by the present application.
[0033] The raw materials, reagents or devices used in the following examples, unless otherwise specified, can be obtained from conventional commercial channels or can be obtained by existing known methods.
[0034] The raw material components and amounts of the anionic polyacrylamide solution of Examples 1-5 and Comparative Examples 1-6 are shown in Table 1.
[0035] Table 1: Raw material components and amounts (weight percentage) of the anionic polyacrylamide solution of Examples 1-5 and Comparative Examples 1-6
[0036]
[0037]
[0038] Example 1
[0039] An anionic polyacrylamide solution, the raw material components and amounts of which are shown in Table 1.
[0040] A preparation method of an anionic polyacrylamide solution, comprising the following steps:
[0041] (1) According to the formula proportion, accurately weigh 0.6g APAM solid powder, 0.05g glycerol, 0.05g urea, 0.2g citric acid and 99.1mL water;
[0042] (2) First, add water to the stirred tank, start stirring, then slowly add APAM solid powder and citric acid into the water, stir at room temperature until the solid APAM particles are dissolved uniformly, then add the mixed reagent of glycerol and urea while stirring, and stir uniformly to obtain the anionic polyacrylamide solution.
[0043] Example 2
[0044] An anionic polyacrylamide solution, the raw material components and amounts of which are shown in Table 1.
[0045] A preparation method of an anionic polyacrylamide solution, comprising the following steps:
[0046] (1) According to the formula proportion, accurately weigh 0.6g APAM solid powder, 0.05g glycerol, 0.05g urea, 0.2g citric acid and 99.1mL water;
[0047] (2) First, water is added to the stirred kettle, and after starting stirring, APAM solid powder and sodium citrate are slowly added to the water. Stirring is performed at room temperature until the mixture is uniformly dissolved, and there are no obvious solid APAM particles. Then, while stirring, a mixture of glycerol and urea is added, and the mixture is stirred until it is uniformly mixed. Thus, an anionic polyacrylamide solution is obtained.
[0048] Example 3
[0049] An anionic polyacrylamide solution, whose raw material components and amounts are shown in Table 1.
[0050] A method for preparing an anionic polyacrylamide solution, comprising the following steps:
[0051] (1) According to the formula proportion, 0.6 g of APAM solid powder, 0.1 g of glycerol, 0.05 g of sodium polyacrylate, 0.05 g of sodium tripolyphosphate, 0.2 g of citric acid, and 99 mL of water are accurately weighed;
[0052] (2) First, water is added to the stirred kettle, and after starting stirring, APAM solid powder and sodium citrate are slowly added to the water. Stirring is performed at room temperature until the mixture is uniformly dissolved, and there are no obvious solid APAM particles. Then, while stirring, a mixture of glycerol and polyacrylate, sodium tripolyphosphate is added, and the mixture is stirred until it is uniformly mixed. Thus, an anionic polyacrylamide solution is obtained.
[0053] Example 4
[0054] An anionic polyacrylamide solution, whose raw material components and amounts are shown in Table 1.
[0055] A method for preparing an anionic polyacrylamide solution, comprising the following steps:
[0056] (1) According to the formula proportion, 0.6 g of APAM solid powder, 0.1 g of glycerol, 0.05 g of sodium polyacrylate, 0.05 g of sodium tripolyphosphate, 0.2 g of citric acid, and 99 mL of water are accurately weighed;
[0057] (2) First, water is added to the stirred kettle, and after starting stirring, APAM solid powder and sodium citrate are slowly added to the water. Stirring is performed at room temperature until the mixture is uniformly dissolved, and there are no obvious solid APAM particles. Then, while stirring, a mixture of glycerol and polyacrylate, sodium tripolyphosphate is added, and the mixture is stirred until it is uniformly mixed. Thus, an anionic polyacrylamide solution is obtained.
[0058] Example 5
[0059] An anionic polyacrylamide solution, whose raw material components and amounts are shown in Table 1.
[0060] A method for preparing an anionic polyacrylamide solution, comprising the following steps:
[0061] (1) According to the formula proportion, accurately weigh 2 g of APAM solid powder, 0.1 g of glycerol, 0.1 g of sodium polyacrylate, 0.2 g of potassium citrate, and 97.6 mL of water;
[0062] (2) First, 99 mL of water is added to the stirred kettle, and after starting stirring, APAM solid powder and potassium citrate are slowly added to the water. Stir at room temperature until the solid APAM particles are dissolved uniformly, and then add the mixed reagent of glycerol and sodium polyacrylate while stirring. Stir uniformly to obtain an anionic polyacrylamide solution.
[0063] Comparative Example 1
[0064] The difference between Comparative Example 1 and Example 1 is only that Comparative Example 1 uses an equal amount of ammonium chloride to replace urea, and the others are the same as Example 1.
[0065] Comparative Example 2
[0066] The difference between Comparative Example 2 and Example 1 is only that Comparative Example 2 uses an equal amount of ethylene glycol to replace glycerol, and the others are the same as Example 1.
[0067] Comparative Example 3
[0068] The difference between Comparative Example 3 and Example 1 is only that Comparative Example 3 uses an equal amount of oxalic acid to replace citric acid, and the others are the same as Example 1.
[0069] Comparative Example 4
[0070] The difference between Comparative Example 4 and Example 4 is only that Comparative Example 4 uses an equal amount of ethylene glycol to replace glycerol, and the others are the same as Example 4.
[0071] Comparative Example 5
[0072] The difference between Comparative Example 5 and Example 4 is only that Comparative Example 5 uses an equal amount of calcium carbonate to replace EDTA, and the others are the same as Example 4.
[0073] Comparative Example 6
[0074] The difference between Comparative Example 6 and Example 4 is only that Comparative Example 6 uses an equal amount of oxalic acid to replace citric acid, and the others are the same as Example 4.
[0075] Performance Test
[0076] The anionic polyacrylamide solutions prepared in Examples 1-5 and Comparative Examples 1-6 were monitored for dynamic viscosity, and the stability of the anionic polyacrylamide solutions was evaluated by dynamic viscosity.
[0077] The dynamic viscosity test method is as follows: the dynamic viscosity of the anionic polyacrylamide solution is measured by a viscometer method, 500 mL of the anionic polyacrylamide solution prepared in Examples 1-5 and Comparative Examples 1-6 is measured by a measuring cylinder, and is placed in a clean beaker for dynamic viscosity determination at room temperature. The value on the viscometer is recorded, and the initial dynamic viscosity of the anionic polyacrylamide solution and the dynamic viscosity after storage for 5 days (5d), 10 days (10d), 15 days (15d), 20 days (20d), 25 days (25d), 30 days (30d), 35 days (35d), and 40 days (40d) at room temperature (25℃) are tested, respectively.
[0078] The dynamic viscosity data of the anionic polyacrylamide solution prepared in Examples 1-5 and Comparative Examples 1-6 is shown in Table 2.
[0079] Table 2: Dynamic viscosity results of the anionic polyacrylamide solution prepared in Examples 1-5 and Comparative Examples 1-6
[0080]
[0081]
[0082] As can be seen from Table 2, the dynamic viscosity of the anionic polyacrylamide solution prepared in the examples of the present application can be kept stable within 30 days, the initial viscosity of the APAM solution with a concentration of 0.6% is about 1800 mPa·s, the reduction within 30 days is less than 10%, and the active ingredient is well preserved. When the anionic polyacrylamide solution is applied to sewage sludge treatment, it has good flocculation, decolorization, and filtration aid performance, and can achieve good treatment effect on sewage sludge.
[0083] In Comparative Example 1, an equal amount of ammonium chloride is used to replace urea, and other conditions are the same as in Example 1. However, the initial viscosity of the anionic polyacrylamide solution in Comparative Example 1 is about the same as that in Example 1, about 1800 mPa·s, but the dynamic viscosity is reduced to 1733 mPa·s after 5 days of storage, which is 140 mPa·s lower than that in Example 1. The dynamic viscosity is reduced to 1561 mPa·s after 15 days of storage, which is 244 mPa·s lower than that in Example 1, and the difference is further enlarged. The dynamic viscosity is reduced to 796.2 mPa·s after 30 days of storage, which is 1012.8 mPa·s lower than that in Example 1, and the dynamic viscosity decreases significantly. Overall, the dynamic viscosity of the anionic polyacrylamide solution in Comparative Example 1 is reduced by 56.37% compared with the initial viscosity after 30 days, and the stability effect is poor. This shows that the use of a specific glycerol and urea compound as a stabilizing masking agent in the preparation of the anionic polyacrylamide solution plays an important role in the stability of the anionic polyacrylamide solution, and further affects the treatment effect when applied to sewage and sludge treatment.
[0084] Comparative Example 2 uses an equal amount of ethylene glycol to replace glycerol, and the rest is the same as Example 1, which results in that the initial viscosity of the anionic polyacrylamide solution of Comparative Example 2 is about the same as that of Example 1, about 1800 mPa s, but the dynamic viscosity decreases to 1630 mPa s after 5 days of storage, 243 mPa s lower than that of Example 1, the dynamic viscosity decreases to 1097 mPa s after 15 days, 708 mPa s lower than that of Example 1, the gap is further enlarged, the dynamic viscosity decreases to 704.6 mPa s after 30 days, 1104.4 mPa s lower than that of Example 1, the gap is significantly increased. Overall, the dynamic viscosity of the anionic polyacrylamide solution of Comparative Example 2 after 30 days is reduced by 61.79% compared with the initial dynamic viscosity, the stability of the anionic polyacrylamide solution is poor, which shows that the compounding of glycerol and urea in the stabilizing masking agent plays an important role in the stability of the anionic polyacrylamide solution during the preparation of the anionic polyacrylamide solution, and further affects the treatment effect when applied to sewage and sludge treatment subsequently.
[0085] Comparative Examples 1 and 2 show that glycerol and urea in the stabilizing masking agent are indispensable, and the combination of the two can make the anionic polyacrylamide solution have good stability.
[0086] Comparative Example 3 uses an equal amount of oxalic acid to replace citric acid, and the rest is the same as Example 1, which results in that the initial viscosity of the anionic polyacrylamide solution of Comparative Example 3 is about the same as that of Example 1, about 1800 mPa s, but the dynamic viscosity decreases to 1654 mPa s after 5 days of storage, 219 mPa s lower than that of Example 1, the dynamic viscosity decreases to 1375 mPa s after 15 days, 430 mPa s lower than that of Example 1, the gap is further enlarged, the dynamic viscosity decreases to 928.8 mPa s after 30 days, 880.2 mPa s lower than that of Example 1, the gap is significantly increased. Overall, the dynamic viscosity of the anionic polyacrylamide solution of Comparative Example 3 after 30 days is reduced by 48.71% compared with the initial dynamic viscosity, the stability of the anionic polyacrylamide solution is poor, which shows that the addition of the specific viscosity reducer citric acid during the preparation of the anionic polyacrylamide solution plays an important role in the stability of the anionic polyacrylamide solution, and further affects the treatment effect when applied to sewage and sludge treatment subsequently.
[0087] Comparative Example 4 uses an equal amount of ethylene glycol to replace glycerol, and the rest is the same as Example 4, which results in that the initial viscosity of the anionic polyacrylamide solution of Comparative Example 4 is about the same as that of Example 4, about 13000 mPa s, but the dynamic viscosity decreases to 12573 mPa s after 5 days of storage, 504 mPa s lower than that of Example 4, the dynamic viscosity decreases to 10624 mPa s after 15 days, 2090 mPa s lower than that of Example 4, the gap is further widened, the dynamic viscosity decreases to 4215 mPa s after 30 days, 8268 mPa s lower than that of Example 4. Overall, the dynamic viscosity of the anionic polyacrylamide solution of Comparative Example 4 after 30 days is reduced by 67.72% compared with the initial dynamic viscosity, the stability of the anionic polyacrylamide solution is poor, which shows that the compounding of glycerol and EDTA in the stabilizing masking agent plays an important role in the stability of the anionic polyacrylamide solution, thereby affecting the treatment effect when applied to sewage and sludge treatment subsequently.
[0088] Comparative Example 5 uses an equal amount of calcium carbonate to replace EDTA, and the rest is the same as Example 4, which results in that the initial viscosity of the anionic polyacrylamide solution of Comparative Example 5 is about the same as that of Example 4, about 13000 mPa s, but the dynamic viscosity decreases to 10029 mPa s after 5 days of storage, 3048 mPa s lower than that of Example 4, the dynamic viscosity decreases to 6502 mPa s after 15 days, 6212 mPa s lower than that of Example 4, the gap is further widened, the dynamic viscosity decreases to 3317 mPa s after 30 days, 9166 mPa s lower than that of Example 4. Overall, the dynamic viscosity of the anionic polyacrylamide solution of Comparative Example 5 after 30 days is reduced by 74.30% compared with the initial dynamic viscosity, the stability of the anionic polyacrylamide solution is poor, which shows that the compounding of glycerol and EDTA in the stabilizing masking agent plays an important role in the stability of the anionic polyacrylamide solution, thereby affecting the treatment effect when applied to sewage and sludge treatment subsequently.
[0089] Comparative Example 4 and Comparative Example 5 also show that glycerol and EDTA in the stabilizing masking agent are indispensable, and the two work together to make the anionic polyacrylamide solution have good stability.
[0090] Comparative Example 6 uses an equal amount of oxalic acid to replace citric acid, and the rest is the same as Example 4. The result is that the initial viscosity of the anionic polyacrylamide solution of Comparative Example 6 is about the same as that of Example 1, about 13000 mPa·s, but the dynamic viscosity decreases to 11783 mPa·s after 5 days of storage, 1294 mPa·s lower than Example 4, the dynamic viscosity decreases to 9875 mPa·s after 15 days, 2839 mPa·s lower than Example 4, the gap is further widened, the dynamic viscosity decreases to 4719 mPa·s after 30 days, 7764 mPa·s lower than Example 4, which shows that the gap is more obvious with the extension of time. Overall, the dynamic viscosity of the anionic polyacrylamide solution of Comparative Example 6 after 30 days is reduced by 65.82% compared with the initial dynamic viscosity, the stability of the anionic polyacrylamide solution is poor, which shows that the addition of the viscosity reducer citric acid in the anionic polyacrylamide solution plays an important role in the stability of the anionic polyacrylamide solution, thereby affecting the subsequent application in sewage and sludge treatment.
[0091] Comparative Examples 3 and 6 show that only a specific type of viscosity reducer can make the anionic polyacrylamide solution have good stability.
[0092] In summary, the stabilizing masking agent of the present application uses glycerol, and at least one of urea, sodium polyacrylate, zeolite, and complexing agent, and combines with a specific type of viscosity reducer, so that the polyacrylamide solution has good stability, can exist in the form of solution for more than 30 days, and can maintain the flocculation, decolorization and filtration aid performance of the APAM solution for sewage and sludge, and achieve good sewage and sludge treatment effect.
[0093] The above examples are only used to illustrate the technical solutions of the present application, but not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.
Claims
1. An anionic polyacrylamide solution, characterized in that It includes anionic polyacrylamide, stabilizing masking agent, viscosity reducing agent and water; The stabilizing masking agent includes glycerol and substance A; The substance A includes at least one of urea, sodium polyacrylate, zeolite, and a complexing agent; The viscosity reducer includes at least one of citric acid and citrate.
2. The anionic polyacrylamide solution according to claim 1, characterized in that The weight ratio of the glycerol to substance A is 100:(18-220).
3. The anionic polyacrylamide solution according to claim 1, characterized in that The citrate includes at least one of sodium citrate and potassium citrate.
4. The anionic polyacrylamide solution according to claim 1, characterized in that Calculated by weight percentage, the anionic polyacrylamide solution comprises 0.09-5.5% of anionic polyacrylamide, 0.09-1.1% of a stabilizing masking agent, 0.05-5.5% of a viscosity reducer, and 87.9-99.77% of water.
5. The anionic polyacrylamide solution according to any one of claims 1 to 4, characterized in that The molecular weight of the anionic polyacrylamide is ≤2200w.
6. The anionic polyacrylamide solution according to any one of claims 1 to 4, characterized in that The hydrolysis degree of the anionic polyacrylamide is ≤80%.
7. The anionic polyacrylamide solution according to claim 1, characterized in that The complexing agent includes at least one of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, trisodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, chitosan, methylglycine diacetic acid, nitrilotriacetic acid, trisodium nitrilotriacetate, diethylenetriamine pentaacetic acid, pentasodium diethylenetriamine pentaacetate, N-hydroxyethylethylenediaminetriacetic acid, trisodium hydroxyethylethylenediaminetriacetate, sodium tripolyphosphate, pentamethylpiperidinol, and sodium mercaptobenzothiazole.
8. The method for preparing the anionic polyacrylamide solution according to any one of claims 1 to 7, characterized in that: The following steps are involved: The various raw material components are mixed to prepare the anionic polyacrylamide solution.
9. The preparation method according to claim 8, characterized in that The anionic polyacrylamide, viscosity reducer and water are mixed, and then the stabilizing masking agent is added and mixed to prepare the anionic polyacrylamide solution.
10. Use of the anionic polyacrylamide solution according to any one of claims 1 to 7 in wastewater treatment.