A scale inhibitor for fluoride scale and a method for preparing the same

Abstract

The application provides a scale inhibitor for fluoride scale and a preparation method thereof, characterized by the following raw material components in percentage by weight: sodium ethylenediaminetetramethylene phosphonate: 15-30%; diethylenetriamine pentaformal phosphonic acid: 15-20%; acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer: 15-20%; maleic anhydride-styrene sulfonic acid copolymer: 1-5%; vinylbenzoic acid-methyl methacrylic acid polyethylene glycol monomethyl ether ester copolymer: 5-10%; cetyl sulfobetaine: 1-5%; isothiazolinone: 1-3%; and water: the balance. The scale inhibitor has good chelation with Al 3+ , Ca 2+ , and can inhibit the combination of the scale inhibitor with crystalline anions (such as CO3 2‑ , SO4 2 , F ‑ ) into solids. Under the synergistic effect of multiple components, the scale inhibitor has good scale inhibition and dispersion effect on high fluoride water quality, and will not cause secondary pollution to a membrane system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of scale inhibitor technology, and particularly relates to a scale inhibitor for fluoride scale and a preparation method thereof. BACKGROUND

[0002] In recent years, the fluorine chemical industry in China has developed rapidly, and the overall fluorine chemical market is growing at a rate of 15-20%. In the future, the fluorine chemical industry will also be one of the fastest-growing industries in the chemical industry. However, the environmental threat brought by the rapid development of the fluorine chemical industry has become the biggest obstacle to the sustainable development of the industry. On the one hand, a large amount of fluorine-containing wastewater is generated during the manufacturing process of fluorine chemical products, which can easily pollute water bodies, soil and plants. On the other hand, since most of the fluorine elements in the wastewater treatment ultimately enter the sludge, the fluorine content in the sludge is high, and in the storage, transportation and disposal process, it is easy to cause serious and widespread secondary pollution, and once the pollution of soil and groundwater is formed, it is extremely difficult to restore. Therefore, the fluorine-containing sludge generated in the treatment process of fluorine-containing wastewater poses a greater threat and harm to the environment than wastewater, and its reduction, harmlessness and resource utilization have become a difficult problem to be solved.

[0003] There are several methods for treating high-concentration fluorine-containing wastewater at home and abroad at present, and the common ones are chemical precipitation method and flocculation precipitation method. Among them, the chemical precipitation method is mainly used for high-concentration fluorine-containing wastewater treatment, and the calcium salt precipitation method and aluminum salt defluorination method are commonly used, that is, by adding calcium salt and aluminum salt and other chemical drugs to the wastewater, calcium ions and fluorine ions react to generate CaF2 or AlF3 precipitate to achieve the purpose of removing fluorine in the wastewater. This process is simple and convenient, and the cost is low, but on the one hand, the fluorine content in the wastewater treated by this method is more than 20 mg / L, which is difficult to meet the national discharge standard; on the other hand, the generated CaF2 or AlF3 precipitate will be wrapped on the surface of calcium hydroxide or aluminum hydroxide particles, so that the salt cannot be fully utilized, and therefore an excessive amount of calcium salt or aluminum salt needs to be added, resulting in that the wastewater after flocculation still contains a large amount of calcium ions, chlorine ions and fluorine ions. These ions are continuously concentrated and enriched in the subsequent water treatment, and after forming a supersaturated solution, they are easy to structure and block the pipeline or ultrafiltration system and reverse osmosis system, accelerate the replacement of the membrane, and greatly increase the production cost of the enterprise.

[0004] The effect of the existing scale inhibitors in the market on fluoride scale dispersion is not ideal, and the commonly used ones such as several agents of the United States Nalco and Japan Kita have relatively single functionality, and can remove limited high fluoride scale. The invention patent CN115975746A discloses a scale inhibitor for coking plant equipment and a preparation method thereof, the scale inhibitor is composed of amide compounds, sulfone compounds, magnetic nanoparticles, dispersants, penetrants and water, different components are compounded, and the purpose of removing unit coking is achieved through online dosing, and the disadvantage is that high fluoride scale cannot be effectively removed.

[0005] Therefore, it is necessary to provide a scale inhibitor for fluoride scale, which simultaneously increases the bactericide component to prevent biological slime and organic matter pollution, avoids scale deposition on the membrane, prevents pollution of the reverse osmosis membrane, and realizes circulation of the membrane, so as to avoid complicated operation and reduce production cost. SUMMARY

[0006] In view of the deficiencies in the prior art, the present application provides a scale inhibitor for fluoride scale and a preparation method thereof.

[0007] The present application is realized by the following technical solutions:

[0008] A scale inhibitor for fluoride scale, according to the weight percentage, the raw material components are as follows:

[0009] Ethylene diamine tetramethylene phosphonic acid sodium (EDTMP): 15-30%;

[0010] Diethylene triamine pentaformal phosphonic acid (DTPMPA): 15-20%;

[0011] Acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer (AA-AMPS): 15-20%;

[0012] Vinyl benzoic acid-methyl methacrylic acid polyethylene glycol monomethyl ether ester copolymer (VBA-PEG): 5-10%;

[0013] Maleic anhydride-styrene sulfonic acid copolymer: 1-5%;

[0014] Cetyl sulfobetaine: 1-5%;

[0015] Isothiazolinone: 1-3%;

[0016] Water: the balance.

[0017] The preparation method of the vinyl benzoic acid-methyl methacrylic acid polyethylene glycol monomethyl ether ester copolymer is as follows:

[0018] Vinyl benzoic acid and polyethylene glycol monomethyl ether methacrylate were added to a three-necked flask filled with distilled water for emulsion polymerization. After the reactants were heated to 60°C, the initiator K2S2O8 was dissolved in water and added dropwise to the three-necked flask. After stirring at 60°C for 24 hours under an argon atmosphere, methanol was added to terminate the polymerization. After purification and drying, vinyl benzoic acid-polyethylene glycol monomethyl ether methacrylate copolymer was obtained.

[0019] The vinyl benzoic acid-methacrylate polyethylene glycol monomethyl ether copolymer has a mass ratio of two repeating units of 1:2 to 1:5 and is water-soluble.

[0020] Preferably, the weight percentage of the sodium ethylenediaminetetramethylenephosphonate (EDTMP) is 18%, 19%, 20%, 21% or 22%, and the purity of the sodium ethylenediaminetetramethylenephosphonate (EDTMP) exceeds 97%.

[0021] Preferably, the weight percentage of the diethylenetriaminepenta(methylenephosphonic acid) (DTPMPA) is 15%, 17%, 18%, 19% or 20%, and the purity of the diethylenetriaminepenta(methylenephosphonic acid) (DTPMPA) is greater than 97%.

[0022] Preferably, the weight percentage of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA-AMPS) is: 15%, 17%, 18%, 19% or 20%.

[0023] Preferably, the weight ratio of VBA to PEG in the vinyl benzoic acid-methacrylate polyethylene glycol monomethyl ether ester copolymer (VBA-PEG) is 1:3.

[0024] Preferably, the weight percentage of the vinyl benzoic acid-methacrylate polyethylene glycol monomethyl ether ester copolymer (VBA-PEG) is 6%, 7%, 8% or 9%.

[0025] Preferably, the weight percentage of the maleic anhydride-styrene sulfonic acid copolymer is 1%, 2%, 3%, 4% or 5%.

[0026] Preferably, the weight percentage of the hexadecyl sulfobetaine is 1%, 2%, 3%, 4% or 5%, and the purity of the hexadecyl sulfobetaine exceeds 98%.

[0027] Preferably, the weight percentage of the isothiazolinone is 1%, 2% or 3%.

[0028] Preferably, the raw material components are as follows in terms of weight percentage:

[0029] Ethylenediaminetetramethylenephosphonate (EDTMP): 25%;

[0030] Diethylene triamine penta (methylene phosphonic acid) (DTPMPA): 15%;

[0031] Acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer (AA-AMPS): 15%;

[0032] Maleic anhydride-styrene sulfonic acid copolymer: 5%;

[0033] Vinyl benzoic acid-methyl methacrylic acid polyethylene glycol monomethyl ether ester copolymer: 8%;

[0034] Cetyl sulfobetaine: 3%;

[0035] Isothiazolinone: 2%;

[0036] Water: the balance.

[0037] A preparation method of a scale inhibitor for fluoride scale, and the preparation process is as follows:

[0038] (1) Under the stirring condition of water as a solvent, a temperature range of 25-30 DEG C, a pressure of one standard atmosphere, and a rotating speed of 100-200 r / min, diethylene triamine penta (methylene phosphonic acid), acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, maleic anhydride-styrene sulfonic acid copolymer, vinyl benzoic acid-methyl methacrylic acid polyethylene glycol monomethyl ether ester copolymer, cetyl sulfobetaine and isothiazolinone are added into water and uniformly mixed to prepare an acidic raw material mixture;

[0039] (2) Under the stirring condition of a temperature range of 60-80 DEG C and a rotating speed of 100-200 r / min, the acidic raw material mixture is slowly added into sodium ethylenediamine tetramethylene phosphonate and uniformly mixed to prepare a mixed raw material;

[0040] (3) The rotating speed of the mixed raw material is increased to 300-400 r / min, and the mixed raw material is stirred for 25-35 min, and then the mixed raw material is reduced to 25-30 DEG C to obtain the scale inhibitor.

[0041] Beneficial effects:

[0042] The scale inhibitor is developed for the once-treated wastewater after flocculation and sedimentation of high-fluoride wastewater, and experiments show that the scale inhibitor has good chelation effect on Al 3+ , Ca 2+ , and can inhibit the combination of Al 2- , Ca 2 - and crystalline anions (such as CO3 -) into a solid; further, the polymers provided by the present application have excellent water dispersibility, and the negatively charged polymer and the positively charged crystal are electrostatically adsorbed, so that the growth of fine crystals is inhibited, thereby reducing the formation of large-sized crystals; furthermore, the phosphoric acid or the salt thereof and the crystal are electrostatically adsorbed, so that the crystal is difficult to grow normally according to the crystal lattice arrangement, and the crystal is distorted, and under the synergistic effect of the multiple components, the scale inhibitor has good scale inhibition and dispersion effect on high-fluoride water quality in water, and does not cause secondary pollution to the membrane system. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a process flow diagram for treating high-fluoride wastewater.

[0044] Figure 2 is an SEM of the precipitate particles obtained from the experiment of inhibiting aluminum fluoride scale. DETAILED DESCRIPTION

[0045] The present application will be further described in detail below in conjunction with specific examples, but the examples do not limit the present application in any form. Unless otherwise specified, the reagents, methods and equipment used in the present application are conventional reagents, methods and equipment in the technical field.

[0046] Example 1

[0047] Vinyl benzoic acid-methyl methacrylic acid polyethylene glycol monomethyl ether ester copolymer was prepared.

[0048] First, the excess polymerization inhibitor in the vinyl benzoic acid and the methyl methacrylic acid polyethylene glycol monomethyl ether ester was removed by using a solid phase extraction column, then 22.31 g of vinyl benzoic acid and 71.36 g of methyl methacrylic acid polyethylene glycol monomethyl ether ester were added to a three-necked flask containing 500 mL of distilled water for emulsion polymerization reaction, after the reactants were heated to 60℃, 1.05 g of initiator K2S2O8 was dissolved in water and added dropwise to the three-necked flask, and after stirring at 60℃ for 24 h under an argon atmosphere, 10 mL of methanol was added to terminate the polymerization, the reactants were concentrated and placed in a 1000 Da dialysis bag for dialysis for 3 d, and then dried to obtain vinyl benzoic acid-methyl methacrylic acid polyethylene glycol monomethyl ether ester copolymer.

[0049] GPC and 1 The molecular structure of the copolymer was tested by H-NMR, and it was found that the Mn of the copolymer was 2103 g / mol, and the unit ratio of -(CH2-CH2-O)- to Ar-H in 1H-NMR was 8.45:1.

[0050] The GPC test conditions were that the solvent was THF and the column temperature was 40℃.

[0051] 1 The H-NMR test conditions were that the solvent was CDCl3.

[0052] The polyethylene glycol monomethyl ether methacrylate was purchased from Shanghai Sigma, with an average Mn of 500 g / mol.

[0053] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA-AMPS) was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0054] Maleic anhydride-styrene sulfonic acid copolymer was purchased from Dow Chemical.

[0055] Scale inhibitors with different components were prepared, and the components are listed in Table 1 according to weight percentage.

[0056] Table 1 (Unit: %)

[0057]

[0058] A method for preparing a scale inhibitor for fluoride scaling, the preparation process is as follows:

[0059] (1) under the conditions of water as solvent, temperature of 25° C., pressure of one standard atmosphere, and stirring at a speed of 200 r / min, diethylenetriamine penta (methylene phosphonic acid), AA-AMPS, maleic anhydride-styrene sulfonic acid copolymer, VBA-PEG, hexadecyl sulfobetaine, and isothiazolinone are added to water and mixed uniformly to prepare an acidic raw material mixture;

[0060] (2) slowly adding the acidic raw material mixture to sodium ethylenediaminetetramethylenephosphonate under stirring conditions of a temperature of 60° C. and a rotation speed of 200 r / min and mixing uniformly to obtain a mixed raw material;

[0061] (3) The mixed raw materials were rotated at an increase speed of 300 r / min and stirred for 35 min, and then the mixed raw materials were cooled to 25° C. to obtain the scale inhibitor.

[0062]

Test 1

[0063] 1. Calcium-blocking salts

[0064] The experiment was carried out with reference to the National Standard of the People's Republic of China GB / T16632-2008 on the performance determination of scale inhibitors for water treatment.

[0065] Specific process of calcium carbonate inhibition experiment: Ca 2+ The mass concentration is 240 mg / L (as Ca 2+ , HCO3 - The mass concentration is 732 mg / L (as HCO3 - The solution pH is 9, the experimental temperature is 80℃, the temperature is kept constant for 10h, and the scale inhibitor dosage concentration is 1ppm.

[0066] Specific process of calcium sulfate inhibition experiment: 2+ The mass concentration is 6800 mg / L (calculated as CaSO4), SO4 2- The mass concentration is 7100 mg / L (calculated as Na2SO4), the solution pH is 7, the experimental temperature is 70℃, the constant temperature is 6h, and the scale inhibitor dosage concentration is 3ppm.

[0067] The results are listed in Table 2.

[0068] Table 2 (Unit: %)

[0069]

[0070] 2. Fluoride scale inhibition

[0071] The experiment refers to the determination of fluoride and the constant temperature four-fold concentration experiment of the National Standard of the People's Republic of China GB / T7484-1987.

[0072] The specific process of the constant temperature four-fold concentration experiment is as follows: the experimental water is 500 mL of once-treated wastewater, a certain concentration of scale inhibitor is added, and then it is concentrated to 4 times the volume under reduced pressure at 70°C. After cooling, the precipitated fluoride precipitate is filtered with a 2μm microporous filter, dried and weighed, and a blank test is performed at the same time.

[0073] The results are listed in Table 3.

[0074] Table 3

[0075] Sample name Turbidity value (NTU) Mass of generated particle sediment (g) blank 20.45 1.90 Example 2 1.28 0.15 Example 3 1.08 0.11 Example 4 1.02 0.10 Example 5 1.15 0.23 Example 6 1 0.10 Comparative Example 1 3.44 0.35 Comparative Example 2 2.08 0.23 Comparative Example 3 6.27 0.61

[0076] 3. Inhibition of aluminum fluoride scale

[0077] The specific process of aluminum fluoride inhibition test is as follows: 1000mL of aluminum chloride solution with a concentration of 18.79mg / L is prepared, and a certain concentration of scale inhibitor is added under stirring. The pH of the solution is 7, and the experimental temperature is room temperature. After stirring for 1h, it is allowed to stand for 5h, and then 2mL of sodium fluoride (i.e., F) with a concentration of 1.84mg / L is added. - The final concentration was 3.67×10 -3 mg / L), at this time, the pH of the solution was kept neutral and the temperature was kept at room temperature. After stirring for 5 minutes, it was allowed to stand for 12 hours. The precipitate was filtered with a 2 μm microporous filter, washed with clean water, and then dried. The mass of the precipitate was weighed and the morphology of the precipitate was observed with SEM (the SEM images of the precipitates obtained in the blank group, Example 3, Comparative Example 1 and Comparative Example 3 are shown in the attached figure). Figure 2 ).

[0078] The quality results of the precipitates are listed in Table 4.

[0079] Table 4

[0080]

[0081] Example 7

[0082] A scale inhibitor for fluoride scaling, characterized in that the raw material components are as follows in weight percentage:

[0083] Ethylenediaminetetramethylenephosphonate (EDTMP): 15%;

[0084] Diethylenetriaminepenta(methylenephosphonic acid) (DTPMPA): 20%;

[0085] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA-AMPS): 18%;

[0086] Maleic anhydride-styrene sulfonic acid copolymer: 3%;

[0087] Vinyl benzoic acid-polyethylene glycol monomethyl ether methacrylate copolymer: 8%;

[0088] Cetyl sulfobetaine: 3%;

[0089] Isothiazolinone: 2%;

[0090] Water: Balance.

[0091] Example 8

[0092] A scale inhibitor for fluoride scaling, characterized in that the raw material components are as follows in weight percentage:

[0093] Ethylenediaminetetramethylenephosphonate (EDTMP): 30%;

[0094] Diethylenetriaminepenta(methylenephosphonic acid) (DTPMPA): 15%;

[0095] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA-AMPS): 18%;

[0096] Maleic anhydride-styrene sulfonic acid copolymer: 2%;

[0097] Vinyl benzoic acid-polyethylene glycol monomethyl ether methacrylate copolymer: 8%;

[0098] Cetyl sulfobetaine: 3%;

[0099] Isothiazolinone: 3%;

[0100] Water: Balance.

[0101] Example 9

[0102] A scale inhibitor for fluoride scaling, characterized in that the raw material components are as follows in weight percentage:

[0103] Ethylenediaminetetramethylenephosphonate (EDTMP): 18%;

[0104] Diethylenetriaminepenta(methylenephosphonic acid) (DTPMPA): 18%;

[0105] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA-AMPS): 20%;

[0106] Maleic anhydride-styrene sulfonic acid copolymer: 1%;

[0107] Vinyl benzoic acid-polyethylene glycol monomethyl ether methacrylate copolymer: 8%;

[0108] Cetyl sulfobetaine: 3%;

[0109] Isothiazolinone: 2%;

[0110] Water: Balance.

[0111] Example 10

[0112] A scale inhibitor for fluoride scaling, characterized in that the raw material components are as follows in weight percentage:

[0113] Ethylenediaminetetramethylenephosphonate (EDTMP): 22%;

[0114] Diethylenetriaminepenta(methylenephosphonic acid) (DTPMPA): 18%;

[0115] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA-AMPS): 15%;

[0116] Maleic anhydride-styrene sulfonic acid copolymer: 3%;

[0117] Vinyl benzoic acid-polyethylene glycol monomethyl ether methacrylate copolymer: 8%;

[0118] Cetyl sulfobetaine: 3%;

[0119] Isothiazolinone: 1%;

[0120] Water: Balance.

[0121]

On-site dynamic tracking test

[0122] Take the scale inhibitors prepared in Examples 7 to 10 and the purchased American Beidi MDC220 and American Qingli 0100 and Figure 1 The process shown is running with a water inlet of 100m 3 / h, the dosing concentration was 5ppm, and the ion concentration in the reverse osmosis concentrated water was measured. The results are listed in Table 5.

[0123] Table 5

[0124]

[0125] Further, the scale inhibitors prepared in Examples 7-10 and the purchased American Bedion MDC220 and American Qingli 0100 were run for a period of time, and the effects of different agents were analyzed and compared by detecting the changes of pressure, pressure difference, conductivity and water production during the operation of the reverse osmosis membrane filtration system. The results are shown in Table 6.

[0126] Table 6

[0127]

[0128] The above examples are the preferred embodiments of the present application, but the embodiments of the present application are not limited to the above examples, and any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application should be equivalent replacement methods, and are all included in the protection scope of the present application.

Claims

1. A scale inhibitor for fluoride scaling, characterized in that: In terms of weight percentage, the raw material components are as follows: Ethylenediaminetetramethylenephosphonate (EDTMP): 15-30%; Diethylenetriaminepenta(methylenephosphonic acid) (DTPMPA): 15-20%; Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA-AMPS): 15-20%; Vinyl benzoic acid-polyethylene glycol monomethyl ether methacrylate copolymer: 5-10%; Maleic anhydride-styrene sulfonic acid copolymer: 1-5%; Hexadecyl sulfobetaine: 1-5%; Isothiazolinone: 1-3%; Water: balance; The vinyl benzoic acid-methacrylate polyethylene glycol monomethyl ether copolymer has a mass ratio of vinyl benzoic acid units to methacrylate polyethylene glycol monomethyl ether units of 1:3-5.

2. The scale inhibitor for fluoride scaling according to claim 1, characterized in that: The preparation method of the vinyl benzoic acid-polyethylene glycol monomethyl ether methacrylate copolymer is as follows: vinyl benzoic acid and polyethylene glycol monomethyl ether methacrylate are added to a three-necked flask filled with distilled water to carry out an emulsion polymerization reaction; after the reactants are heated to 60° C., an initiator K2S2O8 is dissolved in water and then added dropwise to the three-necked flask; and after stirring at 60° C. for 24 hours under an argon protection atmosphere, methanol is added to terminate the polymerization; and after purification and drying, the vinyl benzoic acid-polyethylene glycol monomethyl ether methacrylate copolymer is obtained.

3. The scale inhibitor for fluoride scaling according to claim 1, characterized in that: The weight percentage of the sodium ethylenediaminetetramethylenephosphonate (EDTMP) is 18%, 19%, 20%, 21% or 22%, and the purity of the sodium ethylenediaminetetramethylenephosphonate (EDTMP) exceeds 97%.

4. The scale inhibitor for fluoride scaling according to claim 1, characterized in that: The weight percentage of the diethylenetriaminepenta(methylenephosphonic acid) (DTPMPA) is 18%, 19% or 20%, and the purity of the diethylenetriaminepenta(methylenephosphonic acid) (DTPMPA) is more than 97%.

5. The scale inhibitor for fluoride scaling according to claim 2, characterized in that: The weight percentage of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA-AMPS) is: 15%, 17%, 18%, 19% or 20%.

6. The scale inhibitor for fluoride scaling according to claim 1, characterized in that: The weight percentage of the maleic anhydride-styrene sulfonic acid copolymer is 1%, 2% or 3%.

7. The scale inhibitor for fluoride scaling according to claim 1, characterized in that: The weight percentage of the vinyl benzoic acid-methacrylate polyethylene glycol monomethyl ether copolymer is 6%, 7%, 8% or 9%.

8. The scale inhibitor for fluoride scaling according to claim 1, characterized in that: The weight percentage of the hexadecyl sulfobetaine is 1%, 2%, 3% or 4%, and the purity of the hexadecyl sulfobetaine exceeds 98%.

9. The scale inhibitor for fluoride scaling according to any one of claims 2 to 7, characterized in that: The weight percentage of the isothiazolinone is 1%, 2% or 3%.

10. A method for preparing a scale inhibitor for fluoride scaling, the preparation process is as follows: (1) under stirring conditions of water as a solvent, a temperature range of 25 to 30° C., a pressure of one standard atmosphere, and a rotation speed of 100 to 200 r / min, diethylenetriamine penta (methylene phosphonic acid), acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, maleic anhydride-styrenesulfonic acid copolymer, vinylbenzoic acid-methacrylate polyethylene glycol monomethyl ether copolymer, hexadecyl sulfobetaine, and isothiazolinone are added to water and mixed uniformly to prepare an acidic raw material mixture; (2) slowly adding the acidic raw material mixture to sodium ethylenediaminetetramethylenephosphonate and mixing them uniformly at a temperature range of 60 to 80° C. and a rotation speed of 100 to 200 r / min to prepare a mixed raw material; (3) Increase the rotation speed of the mixed raw materials to 300-400 r / min, stir for 25-35 minutes, and then cool the mixed raw materials to 25-30°C to obtain the scale inhibitor.

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