A biomass source-containing boiler water treatment agent and a method for preparing the same

Abstract

The application relates to the technical field of water treatment agents, and discloses a biomass source-containing boiler water treatment agent and a preparation method thereof, the biomass source-containing boiler water treatment agent is prepared from the following raw materials in mass percentage: secondary desalted water 60-70%, ammonia water 10-20%, 5-10% modified humic acid, 1-5% cashew phenol-based corrosion inhibitor and 5-10% carbohydrazide oxygen scavenger. The modified humic acid and the cashew phenol-based corrosion inhibitor are prepared, the two can synergistically improve the scale inhibition effect and the corrosion inhibition effect of the boiler water treatment agent, and the application has a wide application prospect in the field of industrial boiler treatment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment agent, in particular to a biomass source-containing boiler water treatment agent and a preparation method thereof. BACKGROUND

[0002] As a closed, heated and pressurized thermal device that is prone to explosion, the boiler is widely used in various industries. When the industrial boiler water is heated, with the evaporation of the boiler water, the boiler water is continuously concentrated, and the concentration of some salts such as calcium carbonate and magnesium carbonate is continuously increased, thereby forming a deposit attached to the inside of the container. Not only does this reduce the heat exchange effect of the heating surface and the medium, causing under-deposit corrosion and leading to the thinning of the boiler material, but also hinders the contact between the circulating water and the boiler heating surface, causing the boiler material to overheat and the stress of the material to decrease, which can easily lead to a boiler accident. Therefore, reducing the attachment of salts to reduce energy consumption and accidents is a hot spot for researchers.

[0003] Humic acid is a widely existing macromolecular organic substance in nature, which has the characteristics of green and no pollution, and is widely used in agriculture, forestry, chemical building materials and other fields. Cashew phenol is a biomass material obtained by refining from natural cashew nut shell oil, which has the characteristics of high temperature resistance, excellent toughness, hydrophobicity, green environmental protection and the like. SUMMARY

[0004] (I) Technical problems to be solved

[0005] In view of the deficiencies of the prior art, the present application provides a biomass source-containing boiler water treatment agent and a preparation method thereof. The biomass source-containing boiler water treatment agent prepared has excellent scale inhibition and corrosion inhibition performance.

[0006] (II) Technical solutions

[0007] A biomass source-containing boiler water treatment agent and a preparation method thereof, the biomass source-containing boiler water treatment agent is composed of the following raw materials in mass percentage: secondary desalted water 60-70%, ammonia water 10-20%, 5-10% modified humic acid, 1-5% cashew phenol-based corrosion inhibitor, and 5-10% carbohydrazide oxygen scavenger.

[0008] The preparation method of the biomass source-containing boiler water treatment agent is as follows:

[0009] The ammonia water is added to the secondary desalted water, and stirred and mixed uniformly. Then the modified humic acid, the cashew phenol-based corrosion inhibitor, and the carbohydrazide oxygen scavenger are added thereto, and stirred and mixed uniformly. Sodium hydroxide is used to adjust the pH to 10-12, so as to obtain the biomass source-containing boiler water treatment agent.

[0010] Preferably, the preparation method of the modified humic acid comprises the following steps:

[0011] Preferably, the preparation method of the modified humic acid comprises the following steps:A1, fumaric acid is added to a 25% sodium hydroxide aqueous solution, the pH is adjusted to 7-8, filtered, dried, and then added to a N,N-dimethylacetamide solvent, stirred and dispersed, heated to 120-130°C, 1,3-propane sultone is added, and reacted for 3-5 h. After the reaction is completed, it is distilled under reduced pressure, washed with acetone, and dried to obtain a bisulfonate butenedioate product. In the A1, the mass ratio of fumaric acid to 1,3-propane sultone is 1:2-2.4. In this reaction, the bis-carboxyl structure in fumaric acid is subjected to sulfoalkylation with 1,3-propane sultone to obtain a bisulfonate butenedioate product, and the reaction route is as follows:

[0012] ;

[0013] A2, humic acid is added to deionized water, and a 25% sodium hydroxide aqueous solution is used to adjust the pH to 9. The mixture is stirred and dissolved, and an initiator, acrylic acid, and a bisulfonate butenedioate product are added under a nitrogen atmosphere. The mixture is heated to 70-80°C and reacted for 2-4 h. After the reaction is completed, the mixture is cooled to room temperature, a 10% dilute hydrochloric acid is used to adjust the pH to neutral, and dried to obtain a modified humic acid. In the A2, the mass ratio of humic acid to acrylic acid to bisulfonate butenedioate product is 100:10-20:5-15, and the initiator is potassium persulfate, which is used in an amount of 3-4% of the total mass of humic acid, acrylic acid, and bisulfonate butenedioate product. In this reaction, potassium persulfate is used as an initiator, and the principle of aqueous solution radical polymerization is used to graft acrylic acid and bisulfonate butenedioate product onto humic acid, increase the polar active structure on humic acid, supplement the defect of no sulfonate structure on humic acid, and the branched structure can increase the degree of physical crosslinking inside the modified humic acid and increase the comprehensive function of the modified humic acid.

[0014] Preferably, the preparation method of the cardanol-based corrosion inhibitor comprises the following steps:

[0015] S1, maleic anhydride is added to a chloroform solvent under nitrogen protection, stirred and dispersed, and then a dialkyl secondary amine is added. The mixture is stirred and reacted at 55-60°C for 3-5 h. After the reaction is completed, it is distilled under reduced pressure, washed with deionized water, and dried to obtain an intermediate 1. In the S1, the mass ratio of maleic anhydride to dialkyl secondary amine is 1:3.5-4.5, and the dialkyl secondary amine is one of didodecyl amine and ditetradecyl amine. In this reaction, maleic anhydride is subjected to acylation with a dialkyl secondary amine to obtain an intermediate 1, and the reaction route is as follows:

[0016] ;

[0017] S2, mixing the saturated cardanol glycidyl ether and the diallylamine uniformly, stirring and reacting at 65-75 DEG C for 8-10 h, after the reaction is completed, cooling to room temperature, and drying to obtain the dienyl cardanol; in the S2, the mass ratio of the saturated cardanol glycidyl ether and the diallylamine is 1:0.25-0.3, the saturated cardanol glycidyl ether is a commercially available product, and in the reaction, the saturated cardanol glycidyl ether and the diallylamine are subjected to ring-opening reaction to obtain the dienyl cardanol, i.e. introducing a double bond structure and a hydroxyl structure into the cardanol, and the reaction route is as follows:

[0018] .

[0019] S3, mixing the dienyl cardanol and the phosphorus pentoxide uniformly at room temperature, heating to 70-80 DEG C, reacting for 4-6 h, after the reaction is completed, cooling to room temperature, adding deionized water to hydrolyze for 2-3 h, after the reaction is completed, drying to obtain the phosphorus-containing dienyl cardanol; the amount of the deionized water is 3-4% of the total mass of the dienyl cardanol and the phosphorus pentoxide; in the S3, the mass ratio of the dienyl cardanol and the phosphorus pentoxide is 3.2-3.6:1, and in the reaction, the hydroxyl contained in the dienyl cardanol is subjected to esterification reaction with the phosphorus pentoxide to obtain the phosphorus-containing dienyl cardanol, and the reaction route is as follows:

[0020] .

[0021] S4, adding the maleic anhydride, the intermediate 1 and the dienyl cardanol to deionized water, stirring and mixing uniformly, adding sodium hypophosphite to the mixture, controlling the reaction temperature to be 65-75 DEG C, stirring and reacting for 4-6 h, after the reaction is completed, cooling to room temperature, and drying to obtain the cardanol-based corrosion inhibitor; in the S4, the mass ratio of the maleic anhydride, the intermediate 1, the dienyl cardanol and the sodium hypophosphite is 1:0.5-1:0.5-1:0.1-0.3.

[0022] (Three) beneficial technical effects

[0023] The application uses fumaric acid, 1,3-propane sulfolane, humic acid and the like as raw materials, and prepares a modified humic acid through two-step reaction. The humic acid has a large specific surface area to adsorb salts such as calcium carbonate and magnesium carbonate, hinders the collision and aggregation between the microcrystals of the salts, and makes the crystal not grow normally, thereby hindering the formation of dense and hard scale, increasing the internal stress of the crystal, making the structure unstable, and easily breaking, forming water slag that is easy to flow, so as to achieve the purpose of scale inhibition. The phosphoric acid structure (the cashew phenolic corrosion inhibitor contains the structure), the carboxylic acid structure (the modified humic acid and the cashew phenolic corrosion inhibitor both contain the structure), and the sulfonic acid structure (the modified humic acid contains the structure) in the water treatment prepared by the application can chelate calcium ions and magnesium ions to form chelates, destroy the normal growth process of the calcium carbonate crystal, and make the crystal easily break, thereby hindering the formation of scale. The modified humic acid and the cashew phenolic corrosion inhibitor both contain scale inhibition groups, and the two can synergistically achieve good scale inhibition effect.

[0024] The main chain of the cashew phenolic corrosion inhibitor prepared by the application is a hydrophobic carbon-carbon long chain, and the side chain molecular chain contains a polar group (such as N, O, and P heteroatoms) with multiple anchoring adsorption sites, forms a coordination bond with the metal surface, hinders the contact between the corrosion medium and the metal surface, and improves the corrosion inhibition performance. The dienyl cashew phenol prepared by the application contains a dienyl structure that can copolymerize with other dienyl structures to form a dense three-dimensional network structure. This structure can further form a dense hydrophobic adsorption film on the metal surface, thereby hindering the contact between the corrosion medium and the metal surface. The hydrophobic long chain contained in the cashew phenolic corrosion inhibitor not only can further reduce the hydrophilicity of the metal surface to improve the corrosion inhibition effect, but also can make the molecular part extend into the solution to increase the thickness of the adsorption layer and produce space hindrance, thereby further hindering the corrosion of the corrosion medium to the metal surface. DETAILED DESCRIPTION

[0025] The technical solutions and effects of the application will be further described below in combination with examples, but the specific methods, formulations and descriptions used are not limitations of the application.

[0026] Example 1

[0027] Preparation method of modified humic acid

[0028] A1, 5.85g of fumaric acid is added to a 25% concentration sodium hydroxide aqueous solution, the pH is adjusted to 7, filtration, drying, and then added to a N,N-dimethylacetamide solvent, stirring and dispersing, heating to 120℃, adding 12g of 1,3-propane sulfolane, reacting for 5h, after the reaction is completed, vacuum distillation, acetone washing, and drying to obtain a bisulfonate butenedioate product.

[0029] A2, 20 g of humic acid was added to deionized water, the pH was adjusted to 9 using a 25% sodium hydroxide aqueous solution, and it was stirred and dissolved, 0.7 g of potassium persulfate initiator, 2 g of acrylic acid, and 1 g of the fumaric acid disulfonate butenedioate product were added thereto under a nitrogen atmosphere, and it was warmed to 75°C and reacted for 3 h, after which it was cooled to room temperature, the pH was adjusted to neutral using a 10% dilute hydrochloric acid solution, and it was dried to obtain a modified humic acid.

[0030] Example 2:

[0031] Method for preparing a modified humic acid:

[0032] A1, 5.85 g of fumaric acid was added to a 25% sodium hydroxide aqueous solution, the pH was adjusted to 8, it was filtered and dried, and then it was added to an N,N-dimethylacetamide solvent, it was stirred and dispersed, warmed to 130°C, 14 g of 1,3-propane sultone was added, and it was reacted for 3 h, after which it was distilled under reduced pressure, washed with acetone, and dried to obtain a fumaric acid disulfonate butenedioate product.

[0033] A2, 20 g of humic acid was added to deionized water, the pH was adjusted to 9 using a 25% sodium hydroxide aqueous solution, and it was stirred and dissolved, 0.8 g of potassium persulfate initiator, 3 g of acrylic acid, and 2 g of the fumaric acid disulfonate butenedioate product were added thereto under a nitrogen atmosphere, and it was warmed to 80°C and reacted for 2 h, after which it was cooled to room temperature, the pH was adjusted to neutral using a 10% dilute hydrochloric acid solution, and it was dried to obtain a modified humic acid.

[0034] Example 3:

[0035] Method for preparing a modified humic acid:

[0036] A1, 5.85 g of fumaric acid was added to a 25% sodium hydroxide aqueous solution, the pH was adjusted to 8, it was filtered and dried, and then it was added to an N,N-dimethylacetamide solvent, it was stirred and dispersed, warmed to 125°C, 11.7 g of 1,3-propane sultone was added, and it was reacted for 4 h, after which it was distilled under reduced pressure, washed with acetone, and dried to obtain a fumaric acid disulfonate butenedioate product.

[0037] A2, 20 g of humic acid was added to deionized water, the pH was adjusted to 9 using a 25% sodium hydroxide aqueous solution, and it was stirred and dissolved, 1 g of potassium persulfate initiator, 4 g of acrylic acid, and 3 g of the fumaric acid disulfonate butenedioate product were added thereto under a nitrogen atmosphere, and it was warmed to 70°C and reacted for 4 h, after which it was cooled to room temperature, the pH was adjusted to neutral using a 10% dilute hydrochloric acid solution, and it was dried to obtain a modified humic acid.

[0038] Example 4:

[0039] Preparation method of cashew phenolic corrosion inhibitor:

[0040] S1, under the protection of nitrogen, 10 g of maleic anhydride was added to a chloroform solvent, stirred and dispersed, 35 g of didodecylamine was added, stirred and reacted at 55°C for 5 h, after the reaction was completed, it was distilled under reduced pressure, washed with deionized water and dried to obtain intermediate 1.

[0041] S2, 12 g of saturated cashew phenolic glycidyl ether and 3.5 g of diallylamine were uniformly mixed, stirred and reacted at 75°C for 8 h, after the reaction was completed, it was cooled to room temperature and dried to obtain a dienyl cashew phenol.

[0042] S3, 9 g of dienyl cashew phenol and 2.8 g of phosphorus pentoxide were uniformly mixed at room temperature, heated to 75°C, reacted for 6 h, after the reaction was completed, it was cooled to room temperature, 0.35 g of deionized water was further added and hydrolyzed for 2 h, after the reaction was completed, it was dried to obtain a phosphorus-containing dienyl cashew phenol.

[0043] S4, 10 g of maleic anhydride, 5 g of intermediate 1 and 5 g of dienyl cashew phenol were added to deionized water, stirred and uniformly mixed, 1 g of sodium hypophosphite was further added, the reaction temperature was controlled at 75°C, stirred and reacted for 4 h, after the reaction was completed, it was cooled to room temperature and dried to obtain a cashew phenolic corrosion inhibitor.

[0044] Example 5:

[0045] Preparation method of cashew phenolic corrosion inhibitor:

[0046] S1, under the protection of nitrogen, 10 g of maleic anhydride was added to a chloroform solvent, stirred and dispersed, 35 g of didodecylamine was added, stirred and reacted at 55°C for 5 h, after the reaction was completed, it was distilled under reduced pressure, washed with deionized water and dried to obtain intermediate 1.

[0047] S2, 12 g of saturated cashew phenolic glycidyl ether and 3.6 g of diallylamine were uniformly mixed, stirred and reacted at 65°C for 10 h, after the reaction was completed, it was cooled to room temperature and dried to obtain a dienyl cashew phenol.

[0048] S3, 9.2 g of dienyl cashew phenol and 2.8 g of phosphorus pentoxide were uniformly mixed at room temperature, heated to 80°C, reacted for 4 h, after the reaction was completed, it was cooled to room temperature, 0.4 g of deionized water was further added and hydrolyzed for 3 h, after the reaction was completed, it was dried to obtain a phosphorus-containing dienyl cashew phenol.

[0049] S4, 10g of maleic anhydride, 7g of intermediate 1, 8g of diene-based cardanol are added to deionized water, stirred and mixed uniformly, 2g of sodium hypophosphite is then added, the reaction temperature is controlled at 65°C, stirring is performed for 6h, after the reaction is completed, it is cooled to room temperature, dried, and a cardanol-based corrosion inhibitor is obtained.

[0050] Example 6:

[0051] Preparation method of a cardanol-based corrosion inhibitor:

[0052] S1, under nitrogen protection, 10g of maleic anhydride is added to chloroform solvent, stirred and dispersed, 45g of ditetradecylamine is then added, stirring is performed at 55°C for 4h, after the reaction is completed, it is distilled under reduced pressure, washed with deionized water, and dried to obtain intermediate 1.

[0053] S2, 12g of saturated cardanol glycidyl ether, 3g of diallylamine are mixed uniformly, stirring is performed at 70°C for 10h, after the reaction is completed, it is cooled to room temperature, dried, and a diene-based cardanol is obtained.

[0054] S3, at room temperature, 10g of diene-based cardanol, 2.8g of phosphorus pentoxide are mixed uniformly, heated to 70°C, and reacted for 6h, after the reaction is completed, it is cooled to room temperature, 0.51g of deionized water is then added, and hydrolysis is performed for 2h, after the reaction is completed, it is dried to obtain a phosphorus-containing diene-based cardanol.

[0055] S4, 10g of maleic anhydride, 10g of intermediate 1, 10g of diene-based cardanol are added to deionized water, stirred and mixed uniformly, 3g of sodium hypophosphite is then added, the reaction temperature is controlled at 70°C, stirring is performed for 5h, after the reaction is completed, it is cooled to room temperature, dried, and a cardanol-based corrosion inhibitor is obtained.

[0056] Example 7:

[0057] A biomass source-containing boiler water treatment agent, the mass ratio of each component is: secondary desalting water 64%, ammonia water 20%, 5% modified humic acid, 1% cardanol-based corrosion inhibitor, 10% carbohydrazide oxygen scavenger;

[0058] The biomass source-containing boiler water treatment agent is prepared by the following preparation method:

[0059] According to the above mass percentage, the ammonia water is added to the secondary desalting water, stirred and mixed uniformly, the modified humic acid prepared in Example 1, the cardanol-based corrosion inhibitor prepared in Example 1, and the carbohydrazide oxygen scavenger are then added, stirred and mixed uniformly, sodium hydroxide is used to adjust the pH to 10, and a biomass source-containing boiler water treatment agent is obtained.

[0060] Example 8:

[0061] A biomass source-containing boiler water treatment agent, each component of which has a mass ratio of: secondary desalted water 70%, ammonia water 16%, 6% modified humic acid, 2% cashew phenol-based corrosion inhibitor, 6% carbohydrazide oxygen scavenger;

[0062] The biomass source-containing boiler water treatment agent is prepared by the following preparation method:

[0063] According to the above mass percentage, ammonia water is added to secondary desalted water, stirred and mixed uniformly, and then modified humic acid prepared in Example 1, cashew phenol-based corrosion inhibitor prepared in Example 2, and carbohydrazide oxygen scavenger are added thereto, stirred and mixed uniformly, and sodium hydroxide is used to adjust the pH to 11 to obtain the biomass source-containing boiler water treatment agent.

[0064] Example 9:

[0065] A biomass source-containing boiler water treatment agent, each component of which has a mass ratio of: secondary desalted water 60%, ammonia water 20%, 8% modified humic acid, 4% cashew phenol-based corrosion inhibitor, 8% carbohydrazide oxygen scavenger;

[0066] The biomass source-containing boiler water treatment agent is prepared by the following preparation method:

[0067] According to the above mass percentage, ammonia water is added to secondary desalted water, stirred and mixed uniformly, and then modified humic acid prepared in Example 2, cashew phenol-based corrosion inhibitor prepared in Example 2, and carbohydrazide oxygen scavenger are added thereto, stirred and mixed uniformly, and sodium hydroxide is used to adjust the pH to 10 to obtain the biomass source-containing boiler water treatment agent.

[0068] Example 10:

[0069] A biomass source-containing boiler water treatment agent, each component of which has a mass ratio of: secondary desalted water 65%, ammonia water 15%, 10% modified humic acid, 5% cashew phenol-based corrosion inhibitor, 5% carbohydrazide oxygen scavenger;

[0070] The biomass source-containing boiler water treatment agent is prepared by the following preparation method:

[0071] According to the above mass percentage, ammonia water is added to secondary desalted water, stirred and mixed uniformly, and then modified humic acid prepared in Example 3, cashew phenol-based corrosion inhibitor prepared in Example 3, and carbohydrazide oxygen scavenger are added thereto, stirred and mixed uniformly, and sodium hydroxide is used to adjust the pH to 12 to obtain the biomass source-containing boiler water treatment agent.

[0072] Comparative Example 1

[0073] The difference between this comparative example and Example 7 is that the modified humic acid is not contained in the step of preparing the biomass source-containing boiler water treatment agent.

[0074] Comparative Example 2

[0075] The difference between the present comparative example and Example 7 is that the step of preparing the biomass source-containing boiler water treatment agent does not contain the cashew phenolic corrosion inhibitor.

[0076] The scale inhibition performance of the water treatment agent is tested by the static scale inhibition experiment method according to the national standard GB / T 16632-2008, the scale inhibitor is added into the calcium chloride solution, the Ph is adjusted to 8, the sodium bicarbonate solution is added into the solution, the concentration of calcium ions and bicarbonate ions is controlled to be 0.005 mol / L, the solution is heated in a water bath at 70 DEG C for 12 hours, after the end of the heating, the solution is cooled to room temperature, the solution is filtered, the supernatant is titrated by using the 0.005 mol / L EDTA standard solution, the residual calcium ion concentration is measured, and the scale inhibition rate is calculated.

[0077] The corrosion inhibition effect of the water treatment agent on carbon steel is tested by using the rotary corrosion coupon instrument according to the national standard GB / T 18175-2014.

[0078] Table:

[0079] % of scale inhibition % of corrosion inhibition Example 7 90.5 69.1 Example 8 92.4 72.3 Example 9 95.6 76.4 Example 10 97.3 79.0 Comparative Example 1 80.0 63.4 Comparative Example 2 83.1 52.0

[0080] As shown in the table, the scale inhibition boiler water treatment agent prepared by the present application has excellent scale inhibition effect and corrosion inhibition effect, and the scale inhibition effect and corrosion inhibition effect of the scale inhibition boiler water treatment agent containing the modified humic acid and the cashew phenolic corrosion inhibitor are better.

[0081] The above content is only an example and description of the present application, and those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific examples, as long as the modifications or supplements or replacements do not deviate from the concept of the present application or exceed the scope defined by the present application, and all of the above should belong to the protection scope of the present application.

Claims

1. A scale inhibitor for boiler water treatment, characterized in that, The scale-inhibiting boiler water treatment agent is composed of the following raw materials in the following mass percentages: 60-70% secondary demineralized water, 10-20% ammonia water, 5-10% modified humic acid, 1-5% cashew phenolic corrosion inhibitor, and 5-10% carbonyl hydrazine deoxygenator. The preparation method of the scale inhibitor boiler water treatment agent is as follows: Add ammonia water to the secondary demineralized water, stir and mix evenly, then add modified humic acid, cashew phenolic corrosion inhibitor, and carbonyl hydrazine oxygen remover, stir and mix evenly, and use sodium hydroxide to adjust the pH to 10-12 to obtain scale inhibitor boiler water treatment agent. The method for preparing the modified humic acid includes the following steps: A1. Add fumaric acid to a 25% sodium hydroxide aqueous solution, adjust the pH to 7-8, filter, dry, and then add it to N,N-dimethylacetamide solvent, stir to disperse, heat to 120-130℃, add 1,3-propanesulfonyl lactone, react for 3-5 hours, after the reaction is completed, distill under reduced pressure, wash with acetone, and dry to obtain the disulfonate butenedioate product; A2. Add humic acid to deionized water, adjust the pH to 9 using a 25% sodium hydroxide aqueous solution, stir to dissolve, and add initiator, acrylic acid, and disulfonate butadiene ester product under a nitrogen atmosphere. Heat to 70-80℃ and react for 2-4 hours. After the reaction is complete, cool to room temperature, adjust the pH to neutral using 10% dilute hydrochloric acid, and dry to obtain modified humic acid. The preparation method of the cashew phenol-based corrosion inhibitor includes the following steps: S1. Under nitrogen protection, maleic anhydride was added to chloroform solvent and stirred to disperse. Dialkyl secondary amine was added to the mixture and the reaction was carried out at 55-60℃ for 3-5 hours with stirring. After the reaction was completed, the mixture was distilled under reduced pressure, washed with deionized water, and dried to obtain intermediate 1. S2. Mix saturated cashew phenol glycidyl ether and diallylamine evenly, stir and react at 65-75℃ for 8-10 hours. After the reaction is completed, cool to room temperature and dry to obtain diallyl cashew phenol. S3. At room temperature, mix dialenyl cashew nut shell powder and phosphorus pentoxide evenly, heat to 70-80℃, and react for 4-6 hours. After the reaction is complete, cool to room temperature, then add deionized water to hydrolyze for 2-3 hours. After the reaction is complete, dry to obtain phosphorus-containing dialenyl cashew nut shell powder; the amount of deionized water used is 3-4% of the total mass of dialenyl cashew nut shell powder and phosphorus pentoxide. S4. Add maleic anhydride, intermediate 1, and diene cashew phenol to deionized water, stir and mix evenly, then add sodium hypophosphite. Control the reaction temperature at 65-75℃ and stir for 4-6 hours. After the reaction is complete, cool to room temperature and dry to obtain cashew phenol-based corrosion inhibitor.

2. The scale inhibitor boiler water treatment agent according to claim 1, characterized in that, In A1, the mass ratio of fumaric acid to 1,3-propanesulfonyl lactone is 1:2-2.

4.

3. The scale inhibitor boiler water treatment agent according to claim 1, characterized in that, In A2, the mass ratio of humic acid, acrylic acid, and disulfonate butadiene ester is 100:10-20:5-15.

4. The scale inhibitor boiler water treatment agent according to claim 1, characterized in that, In A2, the initiator is potassium persulfate, and its amount is 3-4% of the total mass of humic acid, acrylic acid, and disulfonate butadiene ester products.

5. The scale inhibitor boiler water treatment agent according to claim 1, characterized in that, In S1, the mass ratio of maleic anhydride to dialkyl secondary amine is 1:3.5-4.5, and the dialkyl secondary amine is one of didodecylamine and ditetradecylamine.

6. The scale inhibitor boiler water treatment agent according to claim 1, characterized in that, In S2, the mass ratio of saturated cashew phenol glycidyl ether to diallylamine is 1:0.25-0.

3.

7. The scale inhibitor boiler water treatment agent according to claim 1, characterized in that, In S3, the mass ratio of dienyl cashew phenol to phosphorus pentoxide is 3.2-3.6:

1.

8. The scale inhibitor boiler water treatment agent according to claim 1, characterized in that, In S4, the mass ratio of maleic anhydride, intermediate 1, dienyl cashew phenol, and sodium hypophosphite is 1:0.5-1:0.5-1:0.1-0.3.