Green water treatment agent with corrosion inhibition and bacteriostasis performance, preparation method and application thereof

Abstract

The application belongs to the technical field of industrial circulating water treatment, and provides a green water treatment agent with corrosion inhibition and bacteriostasis performance, a preparation method and application, the water treatment agent has the structure as shown: The application introduces a piperazine group into a polyaspartic acid peptide bond structure by a graft copolymerization method, synthesizes a novel water treatment agent, the water treatment agent can be adsorbed on a metal surface to form a protective film, has good corrosion inhibition and bacteriostasis performance. The water treatment agent also has bacteriostasis specificity, can inhibit escherichia coli, and retains bacillus cereus. Therefore, the application realizes efficient improvement of the corrosion inhibition performance and bacteriostasis performance of polyaspartic acid, reduces the application of phosphorus-containing compounds, and avoids the influence on the environment.

Description

Technical Field

[0001] This invention relates to the field of industrial circulating water treatment technology, specifically to a green water treatment agent with corrosion inhibition and antibacterial properties, its preparation method, and its application. Background Technology

[0002] Carbon steel is a low-cost, high-strength metallic material widely used in industrial equipment such as pipelines and storage tanks. Meanwhile, acid solutions have extensive applications in various industrial practices, such as acid descaling and pickling. Therefore, corrosion of carbon steel is an unavoidable problem in acid treatment processes. To inhibit corrosion, the use of organic corrosion inhibitors is an important strategy. Among organic corrosion inhibitors, compounds containing heteroatoms (oxygen, nitrogen, sulfur) and aromatic rings have been reported as effective inhibitors. However, most synthetic organic compounds pose potential hazards to human health and cause environmental pollution. Therefore, harmless natural products, such as kiwi leaves, marigolds, and pectin, are often studied as green corrosion inhibitors. However, it should be noted that the antibacterial effect of natural products is limited by their chemical structure and elemental composition.

[0003] Polyaspartic acid (PASP), as a representative green and biodegradable polymer, has attracted increasing attention in water treatment as a scale inhibitor and dispersant. Although PASP has poor corrosion inhibition properties, its typical non-toxic and biodegradable characteristics make its application and modification worthy of further exploration. Most studies on PASP modification focus on improving its scale inhibition properties; previous research has rarely reported on modified PASP as a corrosion inhibitor and antibacterial agent. Summary of the Invention

[0004] To address the technical problem of poor corrosion inhibition performance of existing polyaspartic acid, this invention provides a green water treatment agent with corrosion inhibition and antibacterial properties, along with its preparation method and application. This invention proposes to use chemical modification to graft 1,4-bis(3-aminopropyl)piperazine and carboxyl groups onto the side chains of polyaspartic acid molecules, which not only improves its corrosion inhibition performance but also achieves specific antibacterial effects, inhibiting Escherichia coli while retaining Bacillus cereus.

[0005] The present invention adopts the following technical solution:

[0006] This invention provides a green water treatment agent with corrosion inhibition and antibacterial properties, wherein the water treatment agent has a structure as shown in Formula I below:

[0007]

[0008] Where A represents an unmodified structural unit with a degree of aggregation of n, and B represents a modified structural unit with a degree of aggregation of m. n+m represents the total degree of aggregation. In Equation I, m / (n+m)×100%=55%.

[0009] 1,4-Bis(3-aminopropyl)piperazine, as an important organic intermediate, is widely used in organic synthesis. Compounds designed from it exhibit corrosion inhibition and bactericidal effects. The carboxyl functional group possesses several important properties in water treatment, including scale inhibition, dispersion, high-temperature resistance, resistance to hydrolysis, and low toxicity and environmental friendliness.

[0010] This invention involves ring-opening of polysuccinimide with 1,4-bis(3-aminopropyl)piperazine containing an amino group, introducing functional groups into the polyaspartic peptide bond structure, to synthesize a novel water treatment agent, denoted as PASP-BBA.

[0011] This invention also provides a method for preparing a green water treatment agent with corrosion inhibition and antibacterial properties, comprising the following steps:

[0012] Step 1: Mix polysuccinimide with distilled water, add 1,4-bis(3-aminopropyl)piperazine, and react. After the reaction is complete, purify to obtain the PASP intermediate product.

[0013] Step 2: Dissolve the PASP intermediate completely in distilled water, add bromoacetic acid aqueous solution first, then add sodium carbonate aqueous solution, and react. After the reaction is completed, separate and purify to obtain the target product, i.e., water treatment agent.

[0014] This invention uses polysuccinimide (PSI), 1,4-bis(3-aminopropyl)piperazine (BAPP), bromoacetic acid (BA), and sodium carbonate (Na2CO3) as main raw materials. First, a PASP intermediate is obtained by ring-opening grafting of 1,4-bis(3-aminopropyl)piperazine onto polysuccinimide. Then, under alkaline conditions, the PASP intermediate is reacted with bromoacetic acid to obtain the target product PASP-BBA. The specific reaction route is shown in the following formula:

[0015]

[0016] This invention involves ring-opening polysuccinimide with 1,4-bis(3-aminopropyl)piperazine containing an amino group, and modifying polysuccinimide through the ring-opening reaction to prepare a multifunctional polyaspartic acid derivative with corrosion inhibition and antibacterial properties, which can effectively improve the corrosion inhibition and antibacterial properties of industrial circulating water treatment agents.

[0017] Further, the molar ratio of the polysuccinimide and 1,4-bis(3-aminopropyl)piperazine is (1-3):(1-3), preferably, the molar ratio is 2:2.

[0018] Further, the molar ratio of the PASP intermediate, bromoacetic acid and sodium carbonate is (0.1-0.7):(1-5):(1-10), preferably 0.55:2.75:5.5.

[0019] Further, the reaction temperature in step 1 is room temperature, preferably 15℃~35℃, and the reaction time is 20h~30h. More preferably, the reaction temperature is 25℃ and the reaction time is 24h.

[0020] Further, the reaction temperature in step 2 is 50℃~70℃, and the reaction time is 20h~30h. Preferably, the reaction temperature is 60℃, and the reaction time is 24h.

[0021] Furthermore, 1 mL of distilled water was added for every 1 mmol of polysuccinimide, 1.5 mL of water was added for every 1 mmol of 1,4-bis(3-aminopropyl)piperazine, 0.11 mmol of PASP intermediate was dissolved in 1 mL of water, the concentration of bromoacetic acid aqueous solution was 0.55 mmol / mL, and the concentration of sodium carbonate aqueous solution was 1.1 mmol / mL.

[0022] Furthermore, the pH value of the sodium carbonate aqueous solution is 9 to 11.

[0023] This invention also provides an application of a green water treatment agent with corrosion inhibition and antibacterial properties as a corrosion inhibitor or antibacterial agent in circulating cooling water. This invention introduces functional groups into the side chain of polyaspartic acid, which not only improves the corrosion inhibition performance of polyaspartic acid but also enhances its antibacterial properties.

[0024] Compared with the prior art, the present invention has the following technical effects:

[0025] 1. This invention introduces a carboxyl group and 1,4-bis(3-aminopropyl)piperazine into the side chain of polyaspartic acid to synthesize a novel water treatment agent.

[0026] 2. The degree of polymerization of the modified structural unit of the water treatment agent of the present invention accounts for 55% of the total degree of polymerization, and the water treatment agent synthesized at this degree of polymerization has good corrosion inhibition properties.

[0027] 3. The structure of this water treatment agent allows it to adsorb onto metal surfaces, forming a thin film that protects carbon steel from corrosion by dissolved oxygen and microorganisms in the water, thus providing a corrosion inhibitor effect. Furthermore, this structure exhibits antibacterial specificity, inhibiting Escherichia coli while preserving Bacillus cereus. Escherichia coli is a source of water pollution, while the Bacillus cereus biofilm possesses scale and corrosion inhibition properties, achieving a highly efficient enhancement of the corrosion inhibition and antibacterial properties of polyaspartic acid.

[0028] 4. The synthesis steps of this invention are simple and green, and the synthesized product is a new type of green phosphorus-free water treatment agent that is easily degraded by microorganisms and has good biological and environmental compatibility. Attached Figure Description

[0029] Figure 1 The PASP-BBA prepared in Example 1 of this invention 1 H NMR spectrum;

[0030] Figure 2 The PASP prepared as in Comparative Example 1 of this invention 1 H NMR spectrum;

[0031] Figure 3 The polarization curves of PASP-BBA aqueous solutions with different concentrations prepared in Example 2 of this invention are shown.

[0032] Figure 4 The polarization curves of aqueous solutions of PASP at different concentrations prepared in Comparative Example 2 of this invention are shown.

[0033] Figure 5 The inhibition zone diagram of PASP and PASP-BBA prepared in Example 4 of this invention against Escherichia coli is shown.

[0034] Figure 6 The inhibition zone diagram of PASP and PASP-BBA prepared in Example 4 of this invention against Bacillus cereus;

[0035] Figure 7 The graph shows the effect of the concentration of PASP-BBA prepared in Example 5 of this invention on the survival rate of Escherichia coli. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] Unless otherwise specified, the raw materials used in the following examples and comparative examples are all commercially available products that can be directly purchased or can be prepared using conventional methods in the art.

[0038] The polysuccinimide used in the following examples and comparative examples has a molecular weight of 7000-8000 and was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0039] Example 1

[0040] Synthesis of PASP-BBA

[0041] Weigh 2 mmol of polysuccinimide (PSI) into a reaction vessel, add 2 mL of distilled water (H2O), and then add a mixed solution of 2 mmol of 1,4-bis(3-aminopropyl)piperazine (BAPP) and 3 mL of distilled water. React at room temperature for 24 h. Transfer the resulting solution to a dialysis bag with a molecular weight cutoff of 1000, dialyze in distilled water for 3 days, and evaporate the retentate to dryness using a rotary evaporator to obtain the PASP intermediate. Weigh 2.75 mmol of bromoacetic acid (BA), 5.5 mmol of sodium carbonate, and 0.55 mmol of the PASP intermediate, and add 5 mL of distilled water to each until completely dissolved. Add the PASP intermediate aqueous solution and the bromoacetic acid aqueous solution to a reaction vessel first, then slowly add the sodium carbonate aqueous solution dropwise. Heat the reaction vessel in a 60°C water bath for 24 h. Transfer the resulting solution to a dialysis bag with a molecular weight cutoff of 1000, dialyze in distilled water for 1 day, and evaporate the retentate to dryness using a rotary evaporator to obtain the target product PASP-BBA.

[0042] Figure 1 For the target product PASP-BBA 1 The 1H NMR spectrum showed two broad peaks at 4.47 ppm and 2.75 ppm, with chemical shifts similar to those of PASP. Meanwhile, new peaks at 1.70 ppm, 1.91 ppm, 2.53 ppm, 2.87 ppm, 3.2 ppm, and 3.60 ppm were consistent with the -CH2- peak in the side chain structure of the product PASP-BBA. This confirms the successful preparation of PASP-BBA. Figure 1 Based on the calculation of the peak area of ​​-CH2- on 1,4-bis(3-aminopropyl)piperazine and -CH2- in the side chain structure of PASP-BBA, the m / (n+m)×100% of the target product PASP-BBA is 55%.

[0043] Example 2

[0044] The corrosion inhibition effect of PASP-BBA was determined using an electrochemical corrosion method.

[0045] Electrochemical tests were performed using a CHI660E electrochemical workstation. The reference electrode was a saturated calomel electrode, the auxiliary electrode was a platinum sheet electrode, and the working electrode was a 20# carbon steel electrode with a working area of ​​1 cm². 2 Before testing, the working electrode was polished with sandpaper, then cleaned with ethanol, acetone and distilled water, and dried with cold air. At 25℃, the electrode was first immersed in 500mL of test solution for 60min to obtain a stable open circuit potential (OCP), and then impedance (EIS) and polarization curve were measured. The polarization curve scanning range was ±250mV (vs. OCP), and the scanning rate was 1mV / s. The corrosion inhibition efficiency (η) was obtained from equation (1):

[0046]

[0047] In the formula: and J corr The values ​​represent the corrosion current densities of carbon steel electrodes in 3.5% NaCl solutions containing and without PASP-BBA, respectively.

[0048] The parameters corresponding to the polarization curves are presented in Table 1, including the corrosion potential (E). corr ), corrosion current density (J) corr ) and the Tafel slopes (β) of the anode and cathode α ,β c ).

[0049] The PASP-BBA prepared in Example 1 was formulated into different concentrations, and the polarization curves were measured using an electrochemical method. The polarization curves are shown in the attached figure. Figure 3 The test results are shown in Table 1:

[0050] Table 1. Potentiodynamic polarization parameters of PASP-BBA aqueous solutions at different concentrations

[0051]

[0052]

[0053] Example 2 investigates the effect of different concentrations of PASP-BBA on corrosion inhibition performance using an electrochemical method. As the concentration of PASP-BBA increases, the current density J... corr The corrosion inhibition efficiency was significantly reduced, while η was significantly increased. The maximum corrosion inhibition efficiency of 54.28% was achieved at a concentration of 70 mg / L, which was 33.53% higher than that of control example 2.

[0054] Figure 3 The polarization curves of PASP-BBA aqueous solutions at different concentrations show that the slope β of the cathodic polarization curve increases with increasing PASP-BBA concentration. c The value of PASP-BBA changes very little, and the polarization curves are almost parallel, while the polarization curve of the anode shifts significantly downward, indicating that the addition of PASP-BBA can inhibit the metal dissolution of the anode. Therefore, PASP-BBA is a corrosion inhibitor that mainly inhibits the anode.

[0055] Example 3

[0056] The corrosion inhibition effect of PASP-BBA was determined using the rotating plate method.

[0057] Test Example 1: PASP-BBA on 20 # The corrosion inhibition performance of carbon steel is tested using the following methods:

[0058] According to GB / T1875—2014, for the preparation of standard prepared water, weigh 7.35g of calcium chloride dihydrate, 4.93g of magnesium sulfate heptahydrate, and 6.58g of sodium chloride and dissolve them completely in approximately 7L of water; separately weigh 1.68g of sodium bicarbonate and dissolve it completely in approximately 1L of water. Mix the two solutions thoroughly and dilute with water to 10L. The concentrations of calcium ions in this standard prepared water are 200.4mg / L, magnesium ions are 48.62mg / L, chloride ions are 399.1mg / L, and bicarbonate ions are 122.0mg / L.

[0059] Experimental steps:

[0060] 1) Pretreatment of test pieces: Use filter paper to clean 20 mm of the test piece. # Wipe the carbon steel test pieces clean with anti-rust grease, then wipe them separately with degreased cotton in anhydrous ethanol. Use no less than 50 mL of the above reagent for every ten test pieces. After wiping clean, blot dry with filter paper and place in a desiccator for more than 4 hours. Weigh (accurate to 0.2 mg), record as m1, and store in a desiccator for later use.

[0061] 2) Prepare PASP-BBA solutions of 0, 10, 30, 50, 70, and 100 mg / L in a 2000 mL test cup using standard prepared water. These are the test solutions.

[0062] 3) Hanging the test piece and rotation test: When the test solution reaches 45℃, hang the test piece, start the rotation system, and make the test piece rotate at a speed of 94r / min. The test starts and the duration is 72h.

[0063] 4) Replenishing the test solution: Add test water as needed according to the test results to keep the liquid level at the graduation mark.

[0064] 5) Stop the rotation test: When the specified time is reached, stop the rotation test, take out the test piece and observe and record its appearance.

[0065] 6) Post-treatment of carbon steel test pieces: Clean the test pieces with a brush, then rinse them in the pickling solution for about 30 seconds. Remove them, rinse quickly with tap water, and immediately immerse them in sodium hydroxide solution for about 30 seconds. Remove them, rinse with water, wipe and blot dry with filter paper, soak in anhydrous ethanol for about 3 minutes, place them on clean filter paper, blot dry with filter paper, and place them in a desiccator for at least 4 hours. Weigh them (accurate to 0.2 mg) and record the weight as m2. Simultaneously perform a blank pickling test on the test pieces to calibrate the pickling process.

[0066] 7) Alkaline washing solution: 60 g / L sodium hydroxide solution. Acid washing solution: Add 8 g of hexamethylenetetramine to 1000 mL of hydrochloric acid solution (37% concentrated hydrochloric acid and water at a volume ratio of 1:4), dissolve, and mix well.

[0067] Blank test: Perform a blank test without adding water treatment agent.

[0068] Result calculation.

[0069] In Table 2:

[0070] m1 — Mass of the sample before pretreatment, in grams (g);

[0071] m2 — the mass of the sample after post-processing, in grams (g);

[0072] m — the numerical value of the mass loss of the test piece, in grams (g).

[0073] The corrosion rate is represented by v, with units of mm / a, and is calculated according to formula (2):

[0074]

[0075] In the formula:

[0076] m — the numerical value of the mass loss of the test piece, in grams (g);

[0077] m0—The average mass loss of the sample in the blank acid washing test, in grams (g);

[0078] s — The numerical value of the surface area of ​​the test piece, in square centimeters (cm²). 2 );

[0079] p – The density of the sample, expressed in grams per cubic centimeter (g / cm³). 3 );

[0080] t — The numerical value of the test time, in hours (h);

[0081] 8760 – Hours equivalent to a year, expressed in hours per year (h / a);

[0082] 10 – The number of millimeters equivalent to 1 cm, expressed in millimeters per centimeter (mm / cm).

[0083] The corrosion inhibition rate η is calculated according to formula (3):

[0084]

[0085] In the formula:

[0086] V0 — The numerical value of the corrosion rate of the blank test specimen, in millimeters per year (mm / a);

[0087] V1 – The numerical value of the corrosion rate of the test piece, in millimeters per year (mm / a).

[0088] The corrosion inhibition efficiency of PASP-BBA prepared in Example 1 was determined under different concentrations. The test results are shown in Table 2.

[0089] Table 2 Weight loss parameters of PASP-BBA at different concentrations

[0090]

[0091] Example 3 investigated the effect of different concentrations of PASP-BBA on corrosion inhibition performance using the weight loss method. The test results were consistent with the trend of PASP-BBA corrosion inhibition effect determined by the electrochemical method. Under optimal conditions, a PASP-BBA concentration of 70 mg / L achieved a corrosion inhibition efficiency of 43.92%, which was 23.88% higher than that of Control Example 3.

[0092] Example 4

[0093] Determination of the diameter of the inhibition zone

[0094] The PASP prepared in Control Example 1 and the PASP-BBA prepared in Example 1 were prepared into solutions with mass concentrations of 50 mg / mL and 100 mg / mL, respectively. 200 μL of each solution was taken, and Escherichia coli and Bacillus cereus were used as indicator bacteria. After 24 hours, the diameter of the inhibition zone was measured. The antibacterial effect of PASP was used as the control group.

[0095] Figure 5 The inhibition zones of PASP and PASP-BBA against Escherichia coli are shown. Figure 6 The inhibition zones of PASP and PASP-BBA against Bacillus cereus are shown. PASP showed an inhibition zone diameter of 8.1 mm against both Escherichia coli and Bacillus cereus. PASP-BBA showed an inhibition zone diameter of 18.9 mm against Escherichia coli at a concentration of 100 mg / mL and 17.0 mm at 50 mg / mL, demonstrating superior inhibitory effects against Escherichia coli compared to PASP. PASP-BBA showed an inhibition zone diameter of 8.1 mm against Bacillus cereus at both 100 mg / mL and 50 mg / mL, comparable to the inhibitory effects of PASP. Because PASP-BBA can inhibit Escherichia coli while preserving Bacillus cereus, it exhibits antibacterial specificity, inhibiting pollutants in the aquatic environment while preserving the scale-inhibiting and corrosion-inhibiting Bacillus cereus biofilm.

[0096] Example 5

[0097] The effect of PASP-BBA concentration on the inhibition of Escherichia coli

[0098] The PASP-BBA prepared in Example 1 was prepared into solutions with mass concentrations of 20, 40, 60, 80, and 100 mg / mL to further investigate the effect of PASP-BBA concentration on the inhibition of Escherichia coli.

[0099] Figure 7 The graph shows the effect of PASP-BBA concentration on the survival rate of Escherichia coli. As the concentration of PASP-BBA increases, the survival rate of E. coli shows a significant decreasing trend. In contrast, the survival rate of E. coli decreases slowly with increasing concentration of PASP. Overall, the survival rate of E. coli under the action of PASP is higher than that under the action of PASP-BBA, indicating that PASP-BBA has a good inhibitory effect on E. coli, and the higher the concentration, the better the antibacterial effect. At 100 mg / mL, the survival rate of E. coli is only 21%.

[0100] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

[0101] Compare with Example 1

[0102] PASP Synthesis

[0103] 10 mmol of polysuccinimide (PSI) was weighed into a reaction vessel, and 10 mL of distilled water (H2O), 10 mmol of sodium hydroxide (NaOH), and 10 mL of H2O were added. The reaction was continued at 40 °C for 24 h. The resulting solution was placed into a dialysis bag with a molecular weight cutoff of 1000 and dialyzed against distilled water for 3 days. The retentate was then evaporated to dryness using a rotary evaporator to obtain the target product PASP.

[0104] Figure 2 For PASP 1 The 1H NMR spectrum shows two broad peaks at 4.46 ppm and 2.74 ppm, which correspond to the hydrogen atoms of -CH- and -CH2- in the PASP structure, respectively.

[0105] Compare with Example 2

[0106] Determination of the corrosion inhibition effect of PASP using corrosion electrochemistry

[0107] The experimental procedure was the same as in Control Example 1. Polyaspartic acid was prepared at different concentrations, and its polarization curves were measured electrochemically. The polarization curves are shown in the appendix. Figure 4 The test results are shown in Table 3:

[0108] Table 3. Potentiodynamic polarization parameters of PASP aqueous solutions at different concentrations

[0109]

[0110] Comparative Example 2 uses an electrochemical method to investigate the effect of different concentrations of PASP on corrosion inhibition performance. As the PASP concentration increases, the current density J... corr As the concentration decreases, η increases, reaching a maximum corrosion inhibition efficiency of 20.75% at a concentration of 70 mg / L.

[0111] Compare with Example 3

[0112] The corrosion inhibition effect of PASP was determined using the rotating plate method.

[0113] The experimental procedure was the same as in Control Example 1. The corrosion inhibition efficiency of the prepared PASP was measured under different concentrations. The test results are shown in Table 4.

[0114] Table 4. Weight loss parameters of PASP at different concentrations

[0115]

[0116] Comparative Example 3 uses the weight loss method to investigate the effect of different concentrations of PASP on corrosion inhibition performance. Under optimal conditions, a PASP-BBA agent with a concentration of 70 mg / L can achieve a corrosion inhibition efficiency of 20.04%.

[0117] The embodiments described above are merely preferred embodiments of the present invention and are only used to explain the present invention. They are not intended to limit the scope of the present invention. For those skilled in the art, other implementation methods can be easily made by substitution or modification based on the technical content disclosed in this specification. Therefore, all changes and improvements made to the principles and process conditions of the present invention should be included within the scope of the patent application of the present invention.

Claims

1. A green water treatment agent having corrosion inhibition and bacteriostatic properties, characterized in that, The water treatment agent has bacteriostatic specificity and can inhibit Escherichia coli and retain Bacillus cereus; The water treatment agent has the structure shown in the following formula I: Formula I In the formula, m and n each represent a polymerization degree, and n+m represents a total polymerization degree.

2. The green water treatment agent with corrosion inhibition and bacteriostasis performance according to claim 1, characterized in that, In the formula I, m / (n+m) x 100% = 55%.

3. The method for preparing a green water treatment agent with corrosion inhibition and bacteriostasis performance according to claim 1 or 2, characterized in that, The method comprises the following steps: Step 1: mixing poly succinimide with water, then adding a mixed solution of 1,4-bis(3-aminopropyl)piperazine and water, and reacting to obtain a PASP intermediate product; Step 2: completely dissolving the PASP intermediate product in water, first adding a bromoacetic acid aqueous solution, then adding a sodium carbonate aqueous solution, and reacting to obtain a target product, i.e., the water treatment agent.

4. The method for preparing a green water treatment agent with corrosion inhibition and antibacterial properties according to claim 3, characterized in that, The molar ratio of the poly succinimide and the 1,4-bis(3-aminopropyl)piperazine is (1-3):(1-3).

5. The method for preparing a green water treatment agent with corrosion inhibition and antibacterial properties according to claim 3, characterized in that, The molar ratio of the PASP intermediate product, the bromoacetic acid and the sodium carbonate is (0.1-0.7):(1-5):(1-10).

6. The method for preparing a green water treatment agent with corrosion inhibition and antibacterial properties according to claim 3, characterized in that, The reaction temperature of step 1 is 15-35 DEG C, and the reaction time is 20-30 h; the reaction temperature of step 2 is 50-70 DEG C, and the reaction time is 20-30 h.

7. The method for preparing a green water treatment agent with corrosion inhibition and antibacterial properties according to claim 3, characterized in that, 1 mL of water is added for each 1 mmol of poly succinimide, 1.5 mL of water is added for each 1 mmol of 1,4-bis(3-aminopropyl)piperazine, 1 mL of water is used to dissolve 0.11 mmol of the PASP intermediate product, the concentration of the bromoacetic acid aqueous solution is 0.55 mmol / mL, and the concentration of the sodium carbonate aqueous solution is 1.1 mmol / mL.

8. The method for preparing a green water treatment agent with corrosion inhibition and antibacterial properties according to claim 3, characterized in that, The pH of the sodium carbonate aqueous solution is 9-11.

9. A method for preparing a green water treatment agent with corrosion inhibition and antibacterial properties according to claim 3, characterized in that, The molar ratio of the poly succinimide and the 1,4-bis(3-aminopropyl)piperazine is 2:2, the molar ratio of the PASP intermediate product, the bromoacetic acid and the sodium carbonate is 0.55:2.75:5.5, the reaction temperature of step 1 is 25 DEG C, the reaction time is 24 h, the reaction temperature of step 2 is 60 DEG C, and the reaction time is 24 h.

10. Application of the green water treatment agent with corrosion inhibition and bacteriostatic performance according to claim 1 as a corrosion inhibitor or bacteriostatic agent in circulating cooling water.

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