High-temperature-resistant corrosion and scale inhibitor and preparation method thereof

Abstract

The invention relates to the technical field of scale inhibitors, in particular to a high-temperature-resistant corrosion and scale inhibitor and a preparation method thereof.The preparation method comprises the following steps that firstly, morpholine compounds, functional monomers containing ester groups, chelating agents and sodium hypophosphite are mixed in a reactor, nitrogen is introduced into the reactor to remove oxygen, and the reactor is heated to 80-90 DEG C; 2, an anionic monomer, a persulfate aqueous solution and a chain transfer agent are dropwise added into the reactor for a polymerization reaction, the temperature of the reactor is controlled to be 80-90 DEG C, and a heat preservation reaction is conducted after dropwise adding is completed; and step 3, adding an aging agent into the reactor to carry out aging reaction, and obtaining the high-temperature-resistant corrosion and scale inhibitor after aging is finished. The ester group and the morpholine group are introduced, so that the polymer has the characteristic of high temperature resistance and also has excellent scale and corrosion inhibitor performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of scale inhibitors, in particular to a high-temperature-resistant corrosion and scale inhibitor and a preparation method thereof. BACKGROUND

[0002] Industrial circulating cooling water system is the heat exchange hub of industrial production, and its stable operation is crucial to energy efficiency and equipment life. With the development of modern technology towards high temperature, high efficiency and high load, the temperature of the system heat end is continuously rising (>60℃, even more than 80℃), which puts forward higher requirements for water treatment chemicals. The conventional scale and corrosion inhibitors widely used at present have the following key performance defects under high temperature conditions, which has become a bottleneck restricting the safe and economic operation of the system: the molecular main chain or functional group of conventional polymers (such as polyacrylic acid PAA, polymaleic acid HPMA) and part of organic phosphonic acid (such as ATMP) is easy to decompose, hydrolyze or oxidize under continuous high temperature. This not only leads to rapid attenuation of the effective concentration of the agent, but also the decomposition products may become a new source of deposition, aggravating corrosion or scaling. Due to its inherent hydrolytic instability, environmental unfriendliness and performance limitations, multi-element phosphate has been unable to meet the requirements of modern industrial water treatment for high efficiency, environmental protection and long-period stable operation, so it is required to develop a low-phosphorus high-temperature-resistant scale and corrosion inhibitor. SUMMARY

[0003] Therefore, the present application aims to provide a high-temperature-resistant corrosion and scale inhibitor and a preparation method thereof to solve the problem of performance defects of the corrosion and scale inhibitor under high temperature conditions.

[0004] To achieve the above purpose, the present application provides a preparation method of a high-temperature-resistant corrosion and scale inhibitor, comprising the following steps in terms of 100 parts by weight of anionic monomers in raw materials:

[0005] Step one, mix 1-2 parts by weight of morpholine compounds, 0.3-2 parts by weight of functional monomers containing ester groups, 0.01-0.02 parts by weight of chelating agents and 0.1-0.5 parts by weight of sodium hypophosphite in a reactor to prepare an aqueous solution, deoxygenate the reactor by nitrogen and heat to 80-90℃;

[0006] Step two, add anionic monomers, 0.2-0.8 parts by weight of aqueous solution of persulfate, 0.2-0.6 parts by weight of chain transfer agent to the reactor for polymerization reaction, and control the temperature of the reactor at 80-90℃, wherein the addition of persulfate and chain transfer agent is throughout the addition process of anionic monomers, and the temperature is kept after the addition is completed;

[0007] Step three, add 0.5-2 parts by weight of aging agent to the reactor for aging reaction, and obtain the high-temperature-resistant corrosion and scale inhibitor after the aging is completed.

[0008] The anionic monomer is one or more of sodium acrylate, disodium maleate, and sodium 2-acrylamido-2-methylpropane sulfonate.

[0009] The chelating agent is one of disodium ethylenediaminetetraacetate, nitrilotriacetic acid (NTA), or diethylenetriaminepentaacetic acid.

[0010] The functional monomer in step one is one of dimethylaminoethyl methacrylate, methyl acrylate, methyl methacrylate, hydroxypropyl acrylate, ethyl acrylate, or hydroxyethyl acrylate.

[0011] The morpholine compound in step one includes N-allylmorpholine, N-acrylmorpholine, morpholinoethyl methacrylate, and N-vinylmorpholine.

[0012] The reactor is a reaction kettle, and the nitrogen deoxygenation mode in step one is to introduce nitrogen from the bottom of the reaction kettle, and the flow rate of the nitrogen is 50-100 m 3 / h.

[0013] The dropping time of the persulfate and the chain transfer agent is 8-12 min longer than the dropping time of the functional monomer.

[0014] The persulfate in step two is one of potassium persulfate, sodium persulfate, or ammonium persulfate.

[0015] The chain transfer agent is sodium hypophosphite.

[0016] The aging agent in step three is one of sodium bisulfite or sodium metabisulfite.

[0017] A high-temperature-resistant corrosion and scale inhibitor is prepared by the preparation method of the high-temperature-resistant corrosion and scale inhibitor.

[0018] The high-temperature-resistant corrosion and scale inhibitor is prepared by the preparation method of the high-temperature-resistant corrosion and scale inhibitor.

[0019] The mechanism of action of the present application is as follows:

[0020] The high molecular polymer with ester group introduced as one component of the compounded formula is a "precursor" or "controlled release" type of polymer design. The core mechanism: in the initial state (initial stage of addition): one end of the molecule is firmly adsorbed on the metal surface through the carboxyl group, and the hydrophobic group at the other end forms a protective layer, which plays a corrosion inhibition role. At this time, the ester group on the molecular chain acts as a "protective group", ensuring the stability of the entire polymer during its entry into the system and storage, especially protecting the hydrolysis-sensitive phosphonic acid group and other functional groups. Action process (under high temperature conditions): under the action of high temperature, the ester group undergoes a controlled hydrolysis reaction, gradually releasing new carboxyl groups.

[0021] The ester group is introduced into the segment of the polymer. Due to the poor solubility of the ester group, it cannot be completely dissolved in water, and thus cannot play the role of corrosion and scale inhibitor. Therefore, a morpholine group is added on the basis of the original segment. The morpholine group has temperature sensitivity. At low temperature, hydrogen bonding between the polymer and water dominates, and water molecules form an ordered "hydration shell" around the polymer chain, separating the polymer chains and improving the solubility of the ester polymer in water. In addition, the introduction of the morpholine group can coordinate with metal ions: they can coordinate with many Lewis acids (electron pair acceptors), especially transition metal ions (such as Cu²⁺, Ni²⁺, Co²⁺, Fe²⁺ / ³⁺, etc.), as heavy metal ion chelating agents or scale inhibitors (interfering with calcium and magnesium ion scale formation), which have good scale inhibition effect.

[0022] The beneficial effects of the present application are:

[0023] 1. The present application realizes high temperature resistance: by sacrificing the relatively unstable ester bond, the more core corrosion and scale inhibition functional groups are protected from rapid failure at high temperature. Function regeneration and enhancement are realized: the newly generated carboxyl group further enhances the scale dispersion ability of the polymer. It can form stable water-soluble complexes with Ca²⁺, Mg²⁺ and other scale-forming ions in water through chelation. Lattice distortion effect: interferes with the normal growth of calcium carbonate and other microcrystals, making them loose and easy to be washed away by water flow. Dispersion effect: suspends the formed microcrystals in water to prevent their aggregation and deposition. Summary of advantages: this is a "spatiotemporal synergistic" effect: spatially: the same molecule has multiple functions such as adsorption, hydrophobicity, chelation and dispersion. Temporally: the hydrolysis of the ester group realizes the "on-demand release" and "self-enhancement" of the drug function, prolonging its effective action time, thereby maximizing the utilization efficiency and achieving cost reduction and efficiency enhancement.

[0024] 2. The present application provides steric hindrance effect and polarity by adding morpholine groups, has a relatively rigid group of ring, and itself has the characteristics of high temperature resistance. The morpholine groups and ester groups have a good synergistic effect in the polymer, so that the introduction of ester groups and morpholine groups in the same polymer chain section makes the polymer have the characteristics of high temperature resistance, and also has excellent scale and corrosion inhibitor performance.

[0025] 3. Sodium hypophosphite is used as a chain transfer agent in the synthesis of the polymer to form a "low-phosphorus multifunctional polymer" with a unique structure. It combines the long-chain dispersion ability of polycarboxylic acid and the strong lattice distortion ability of organic phosphonic acid. This structure enables it to obtain better scale inhibition effect than pure PAA at a lower dosage (reflecting the solubility limit effect), while also having certain corrosion inhibition ability, and the phosphorus content is much lower than that of traditional organic phosphonic acid, and the environmental pressure is smaller. DETAILED DESCRIPTION

[0026] To make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below with specific examples.

[0027] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present application should be understood as the usual meaning understood by those skilled in the art to which the present application belongs. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0028] Example 1

[0029] The preparation method of the high-temperature resistant corrosion and scale inhibitor of the present embodiment includes the following steps:

[0030] Step one: 1% of N-allyl morpholine, 1% of ethyl acrylate, 0.01% of ethylenediaminetetraacetic acid disodium, and 0.2% of sodium hypophosphite based on the mass of dry sodium acrylate are configured into an aqueous solution in a reaction kettle. The temperature of the material in the reaction kettle is heated to 85℃, and nitrogen gas is introduced from the bottom of the reaction kettle at a flow rate of 60m 3 / h for 30min.

[0031] Step two: add sodium acrylate, 0.5% of the mass of dry sodium acrylate potassium persulfate solution, and 0.4% of the mass of dry sodium acrylate sodium hypophosphite into the reactor at a certain flow rate, respectively. The sodium acrylate is added for 2.5 hours, the potassium persulfate and sodium hypophosphite are added for 10 minutes longer than the sodium acrylate, and the addition of potassium persulfate and sodium hypophosphite is ensured to be throughout the addition of sodium acrylate. The temperature of the material in the reactor is controlled at 85°C throughout the process. After the material addition is completed, the temperature of the material in the reactor is maintained at 85°C for 1 hour.

[0032] Step three: add 35% sodium bisulfite solution into the reactor, the amount of which is 1% of the dry sodium acrylate. The temperature of the material in the reactor is maintained at 85°C for 1 hour for aging. After the aging is completed, a high-temperature resistant corrosion and scale inhibitor A1 is obtained.

[0033] Example 2

[0034] The preparation method of the high-temperature resistant corrosion and scale inhibitor of the present embodiment comprises the following steps:

[0035] Step one: add 1.5% of the mass of dry sodium 2-acrylamido-2-methylpropanesulfonate N-vinylmorpholine, 0.3% of the mass of dry sodium 2-acrylamido-2-methylpropanesulfonate dimethylaminoethyl methacrylate, 0.01% of the mass of dry sodium 2-acrylamido-2-methylpropanesulfonate disodium ethylenediaminetetraacetate, and 0.2% of the mass of dry sodium 2-acrylamido-2-methylpropanesulfonate sodium hypophosphite into the reactor to form an aqueous solution. The temperature of the material in the reactor is heated to 85°C, and nitrogen is introduced into the reactor from the bottom for 30 minutes, wherein the flow rate of the nitrogen is 60 m 3 / h.

[0036] Step two: add dry sodium 2-acrylamido-2-methylpropanesulfonate, 0.5% of the mass of dry sodium 2-acrylamido-2-methylpropanesulfonate potassium persulfate solution, and 0.4% of the mass of dry sodium 2-acrylamido-2-methylpropanesulfonate sodium hypophosphite into the reactor at a certain flow rate, respectively. The sodium acrylate is added for 2.5 hours, the potassium persulfate and sodium hypophosphite are added for 10 minutes longer than the sodium acrylate, and the addition of potassium persulfate and sodium hypophosphite is ensured to be throughout the addition of sodium acrylate. The temperature of the material in the reactor is controlled at 85°C throughout the process. After the material addition is completed, the temperature of the material in the reactor is maintained at 85°C for 1 hour.

[0037] Step three: add 35% sodium bisulfite solution into the reactor, the amount of which is 1% of the mass of dry sodium 2-acrylamido-2-methylpropanesulfonate. The temperature of the material in the reactor is maintained at 85°C for 1 hour for aging. After the aging is completed, a high-temperature resistant corrosion and scale inhibitor A2 is obtained.

[0038] Example 3

[0039] The preparation method of the high-temperature resistant corrosion and scale inhibitor of the present embodiment comprises the following steps:

[0040] Step one: 2.0% of N-allyl morpholine by dry basis of sodium acrylate, 0.5% of hydroxyethyl acrylate by dry basis of sodium acrylate, 0.01% of disodium ethylenediaminetetraacetate by dry basis of sodium acrylate, and 0.2% of sodium hypophosphite by dry basis of sodium acrylate are configured into an aqueous solution in a reaction kettle. The temperature of the material in the reaction kettle is heated to 85°C, and nitrogen is introduced from the bottom of the reaction kettle for 30 min, wherein the flow rate of the nitrogen is 60 m 3 / h.

[0041] Step two: sodium acrylate, 0.5% of potassium persulfate aqueous solution by dry basis of sodium acrylate, and 0.4% of sodium hypophosphite by dry basis of sodium acrylate are added to the reaction kettle at a certain flow rate. The addition of sodium acrylate is 2.5 h, the addition time of potassium persulfate and sodium hypophosphite is 10 min longer than that of sodium acrylate, and it is ensured that the addition of potassium persulfate and sodium hypophosphite is throughout the addition process of sodium acrylate. The temperature of the material in the reaction kettle is controlled at 85°C throughout the whole process. After the addition of the material is completed, the temperature of the material in the reaction kettle is maintained at 85°C for 1 h.

[0042] Step three: 1% of 35% sodium bisulfite aqueous solution by dry basis of sodium acrylate is added to the reaction kettle, the temperature of the material in the reaction kettle is maintained at 85°C for aging for 1 h, and after the aging is completed, a high-temperature resistant corrosion and scale inhibitor A3 is obtained.

[0043] Comparative Example 1

[0044] The preparation method of the scale inhibitor of the present comparative example comprises the following steps:

[0045] Step one: 1% of N-allyl morpholine by dry basis of sodium acrylate, 0.01% of disodium ethylenediaminetetraacetate by dry basis of sodium acrylate, and 0.2% of sodium hypophosphite by dry basis of sodium acrylate are configured into an aqueous solution in a reaction kettle. The temperature of the material in the reaction kettle is heated to 85°C, and nitrogen is introduced from the bottom of the reaction kettle for 30 min, wherein the flow rate of the nitrogen is 60 m 3 / h.

[0046] Step two: sodium acrylate, 0.5% of potassium persulfate aqueous solution by dry basis of sodium acrylate, and 0.4% of sodium hypophosphite by dry basis of sodium acrylate are added to the reaction kettle at a certain flow rate. The addition of sodium acrylate is 2.5 h, the addition time of potassium persulfate and sodium hypophosphite is 10 min longer than that of sodium acrylate, and it is ensured that the addition of potassium persulfate and sodium hypophosphite is throughout the addition process of sodium acrylate. The temperature of the material in the reaction kettle is controlled at 85°C throughout the whole process. After the addition of the material is completed, the temperature of the material in the reaction kettle is maintained at 85°C for 1 h.

[0047] Step three: add 35% sodium bisulfite aqueous solution to the reactor, the amount of which is 1% of dry basis sodium acrylate, keep the temperature of the reactor material at 85℃ for 1h, and then the corrosion and scale inhibitor B1 is obtained.

[0048] Comparative Example 2

[0049] The preparation method of the scale inhibitor of the present comparative example comprises the following steps:

[0050] Step one: add 0.01% of disodium ethylenediaminetetraacetate and 0.2% of sodium hypophosphite of dry basis sodium acrylate into the reactor, and heat the temperature of the reactor material to 85℃, and then introduce nitrogen gas from the bottom of the reactor for 30min, wherein the flow rate of the nitrogen gas is 60m 3 / h.

[0051] Step two: add sodium acrylate, 0.5% of potassium persulfate aqueous solution of dry basis sodium acrylate, and 0.4% of sodium hypophosphite of dry basis sodium acrylate into the reactor respectively, wherein the addition time of sodium acrylate is 2.5h, the addition time of potassium persulfate and sodium hypophosphite is 10min longer than that of sodium acrylate, and the addition of potassium persulfate and sodium hypophosphite is throughout the addition process of sodium acrylate, and the temperature of the reactor material is controlled at 85℃. After the addition is completed, keep the temperature of the reactor material at 85℃ for 1h.

[0052] Step three: add 35% sodium bisulfite aqueous solution to the reactor, the amount of which is 1% of dry basis sodium acrylate, keep the temperature of the reactor material at 85℃ for 1h, and then the corrosion and scale inhibitor B2 is obtained.

[0053] Comparative Example 3

[0054] The preparation method of the scale inhibitor of the present comparative example comprises the following steps:

[0055] Step one: add 1% of N-allylmorpholine, 1% of ethyl acrylate, 0.01% of disodium ethylenediaminetetraacetate, and 0.2% of sodium formate of dry basis sodium acrylate into the reactor, and heat the temperature of the reactor material to 85℃, and then introduce nitrogen gas from the bottom of the reactor for 30min, wherein the flow rate of the nitrogen gas is 60m 3 / h.

[0056] Step two: add sodium acrylate, 0.5% of the dry basis of sodium acrylate mass of potassium persulfate aqueous solution, 0.4% of the dry basis of sodium acrylate mass of sodium formate to the reaction kettle at a certain flow rate, the drop of sodium acrylate is 2.5h, the drop time of potassium persulfate and sodium hypophosphite is 10 minutes longer than that of sodium acrylate, and it is ensured that the drop of potassium persulfate and sodium hypophosphite is throughout the drop process of sodium acrylate, and the temperature of the material in the reaction kettle is controlled at 85℃ throughout the process. When the material drop is finished, keep the temperature of the material in the reaction kettle at 85℃ for 1h.

[0057] Step three: add 35% sodium bisulfite aqueous solution to the reaction kettle, the amount is 1% of the dry basis of sodium acrylate, keep the temperature of the material in the reaction kettle at 85℃ for 1h, and then get the corrosion and scale inhibitor B3.

[0058] One: corrosion performance test-rotating coupon corrosion test method:

[0059] The rotating coupon corrosion test method is to calculate the coupon corrosion rate and corrosion inhibition rate by measuring the mass loss before and after the coupon test under certain conditions, and then to evaluate the corrosion degree of the metal and the corrosion inhibition of the corrosion and scale inhibitor. In this experiment, the national standard GB / T 18175-2014 was used to test the corrosion of water treatment agent. The test piece was installed on the rotating coupon instrument to ensure complete immersion. In order to test the high temperature resistance of the corrosion inhibitor, the test temperature was adjusted to 50℃, 80℃, 120℃ respectively, and the whole test bottle was placed in a high temperature constant temperature water bath / oil bath to make the water sample reach and maintain the set target high temperature. To test the high temperature resistance of the sample.

[0060] Two: scale inhibition performance test-dynamic simulation method

[0061] Refer to the dynamic simulation test method in the relevant standards such as GB / T 39200-2020 "Determination of fluoride ion, chloride ion, nitrite ion, nitrate ion, phosphate ion and sulfate ion in circulating cooling water by ion chromatography", dynamic method through circulating heating, simulating the actual operation of heat exchanger.

[0062] Device: dynamic scale inhibition evaluation instrument, including heater, circulating pump, flow meter, temperature controller and test tube (or coupon).

[0063] Process: add the prepared simulated water (simulated water prepared according to the method of national standard GB / T 16632-2019) and reagent to the system for circulation. Heat the water to the set high temperature (test temperature 50℃, 80℃, 120℃) by the heater and keep constant temperature. Control certain flow rate and circulation time.

[0064] Evaluation: weighing method: weigh the scale deposited on the test tube (or coupon) before and after the experiment, calculate the scale deposition rate and scale inhibition rate.

[0065] Three: application result analysis - corrosion inhibition

[0066] Table 1: Inhibition rate at temperature 50℃

[0067]

[0068] Table 2: Inhibition rate at temperature 80℃

[0069]

[0070] Table 3: Inhibition rate at temperature 120℃

[0071]

[0072] Result analysis: from the above results, it can be seen that examples 1-3, ester and morpholine groups are added in the synthesis process, with the increase of temperature, the inhibition rate decreases not obviously, the inhibition rate at temperature 120℃ is still greater than 85%, in excellent state, indicating that the corrosion inhibitor has good high temperature resistance effect, B1 product in comparative example 1, without adding ester group, the corrosion effect decreases with the decrease of temperature, B2 product in comparative example 2, neither ester group nor morpholine group is introduced, with the decrease of temperature, the inhibition rate decreases greatly, the product is almost in failure state at 120℃, in comparative example 3, without using sodium hypophosphite chain transfer agent, the overall high temperature resistance effect is excellent, but the overall corrosion effect is lower than that of sodium hypophosphite.

[0073] Four: application result analysis - scale inhibition

[0074] Table 4: Scale inhibition rate at temperature 50℃

[0075]

[0076] Table 5: Scale inhibition rate at temperature 80℃

[0077]

[0078] Table 6: Scale inhibition rate at temperature 120℃

[0079]

[0080] Result analysis: from the above results, it can be seen that examples 1-3, in the process of synthesis, the addition of ester group and morpholine group, with the increase of temperature, the scale inhibition rate decreased not obvious, at the temperature of 120 ℃, the scale inhibition rate is still greater than 85%, in the excellent state, it is explained that the effect of high temperature resistance as scale inhibitor is good, in the comparative example 1, B1 product, without adding ester group, the scale inhibition effect decreases with the decrease of temperature, in the comparative example 2, B2 product, neither the introduction of ester group nor the introduction of morpholine group, with the decrease of temperature, the scale inhibition rate decreases greatly, in the comparative example 3, without using sodium hypophosphite chain transfer agent, the overall high temperature resistance effect is excellent, but the overall scale inhibition effect is lower than that of the product with sodium hypophosphite.

[0081] Five: high temperature resistance performance test after compounding phosphate:

[0082] The A1, A2 and A3 in the above examples 1-3 were respectively compounded with polyphosphonate ATMP and HEDP (mass ratio 3:1) to test their high temperature resistance performance as follows:

[0083] Table 7: scale and corrosion inhibition rate of A1-A3 and polyphosphonate compound at 100 ℃

[0084]

[0085] Table 8: scale and corrosion inhibition rate of A1-A3 and polyphosphonate compound at 120 ℃

[0086]

[0087] Table 9: scale and corrosion inhibition rate of A1-A3 and polyphosphonate compound at 150 ℃

[0088]

[0089] Result analysis: from the above compound formula at different temperatures, the scale and corrosion inhibition rate can be seen, the high temperature resistance performance of the compound of polyphosphonate and the scale and corrosion inhibitor prepared by examples 1-3 is better than that of polyphosphonate alone, and the scale and corrosion inhibition rate of the compound of polyphosphonate and the scale and corrosion inhibitor prepared by examples 1-3 is more excellent than that of polyphosphonate alone, which shows that the scale and corrosion inhibitor prepared by the examples effectively protects the phosphonic acid group, so that the scale and corrosion inhibition efficiency is still good at high temperature, and it also shows that the synergism of the compound of polyphosphonate is good.

[0090] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary, and is not intended to suggest that the present application is limited to these examples; under the idea of the present application, the above embodiments or technical features among different embodiments can also be combined, and the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in details for the sake of brevity. Any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a high-temperature resistant corrosion and scale inhibitor, characterized in that, Based on 100 parts by weight of the anionic monomer in the raw material, the process includes the following steps: Step 1: Mix 1-2 parts by weight of morpholine compound, 0.3-2 parts by weight of ester-containing functional monomer, 0.01-0.02 parts by weight of chelating agent and 0.1-0.5 parts by weight of sodium hypophosphite in a reactor to prepare an aqueous solution. Purge the reactor with nitrogen to remove oxygen and heat to 80-90℃. Step 2: Add anionic monomer, 0.2-0.8 parts by weight of persulfate aqueous solution, and 0.2-0.6 parts by weight of chain transfer agent dropwise to the reactor to carry out the polymerization reaction, and control the temperature of the reactor at 80-90℃. The dropwise addition of persulfate and chain transfer agent is carried out throughout the dropwise addition process of anionic monomer. After the dropwise addition is completed, the reaction is kept at a constant temperature. Step 3: Add 0.5-2 parts by weight of aging agent to the reactor to carry out the aging reaction. After aging, a high-temperature corrosion and scale inhibitor is obtained.

2. The preparation method of the high-temperature resistant corrosion and scale inhibitor according to claim 1, characterized in that, The anionic monomer is one or more of sodium acrylate, disodium maleate, and sodium 2-acrylamido-2-methylpropanesulfonate.

3. The preparation method of the high-temperature resistant corrosion and scale inhibitor according to claim 1, characterized in that, The functional monomer mentioned in step one is one of dimethylaminoethyl methacrylate, methyl acrylate, methyl methacrylate, hydroxypropyl acrylate, ethyl acrylate, or hydroxyethyl acrylate.

4. The preparation method of the high-temperature resistant corrosion and scale inhibitor according to claim 1, characterized in that, The morpholine compounds mentioned in step one include N-allylmorpholine, N-acryloylmorpholine, morpholine ethyl methacrylate, and N-vinylmorpholine.

5. The preparation method of the high-temperature resistant corrosion and scale inhibitor according to claim 1, characterized in that, The reactor is a reaction vessel. In step one, nitrogen deoxygenation is performed by introducing nitrogen gas from the bottom of the reaction vessel at a flow rate of 50-100 m / s. 3 / h.

6. The preparation method of the high-temperature resistant corrosion and scale inhibitor according to claim 1, characterized in that, The addition time of the persulfate and chain transfer agent is 8-12 minutes longer than that of the functional monomer.

7. The preparation method of the high-temperature resistant corrosion and scale inhibitor according to claim 1, characterized in that, The persulfate mentioned in step two is one of potassium persulfate, sodium persulfate, or ammonium persulfate.

8. The preparation method of the high-temperature resistant corrosion and scale inhibitor according to claim 1, characterized in that, The chain transfer agent is sodium hypophosphite.

9. The method for preparing the high-temperature resistant corrosion and scale inhibitor according to claim 1, characterized in that, The aging agent mentioned in step three is either sodium bisulfite or sodium metabisulfite.

10. A high-temperature resistant corrosion and scale inhibitor, characterized in that, It is prepared by the method of any one of claims 1-9 for the preparation of high-temperature corrosion and scale inhibitor.

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