CN106315880B - A kind of scale and corrosion inhibitor and preparation method thereof - Google Patents

Abstract

A kind of anti-incrustation corrosion inhibitor and preparation method thereof, is related to technical field of water treatment chemical.The anti-incrustation corrosion inhibitor; including raw material and its mass ratio of the material are as follows: 2- phosphinylidyne butane -1; 2,4- tricarboxylic acids (PBTCA): 2- hydroxyphosphonoacetic acid (HPAA): acrylic acid/esters copolymer (HB-901): poly-aspartate (PASP): foam discharging agent=(2~3): (2~3): (5~8): (10~15): (5~8).Preparation method, including step 1: material mixing obtains mixed solution；Step 2, foam discharging agent is prepared；Step 3, mixed solution is added in poly-aspartate aqueous solution, reacts 50~60min, foam discharging agent is added, at 40~50 DEG C, stirred 5~6h, anti-incrustation corrosion inhibitor is made.The anti-incrustation corrosion inhibitor is a kind of anti-incrustation corrosion inhibitor for preventing pipeline and equipment from corroding；Double effects with scale inhibition and inhibition are a kind of composite drugs；It is environmentally protective with certain biodegradability；The scope of application is wider.

Description

A kind of scale and corrosion inhibitor and preparation method thereof

technical field

The invention relates to the technical field of water treatment chemicals, in particular to a scale and corrosion inhibitor and a preparation method thereof.

Background technique

In some cooling equipment (such as cooling towers, air coolers, etc.), heat exchange equipment (such as heat exchangers, condensers) and water pumps and pipes, water is used as a cooling medium and is recycled, while industrial cooling water is used in In the process of recycling, due to the increase of water temperature and concentration rate, the content of microorganisms, phosphates, bicarbonate, calcium ions and dissolved oxygen will increase greatly, so the stability of calcium carbonate scale will increase, thereby Fouling occurs. In addition, because the microorganisms will release inorganic scale, mucus, sediment, etc. during the activity, the sediments adhere to the metal surface to form an oxygen concentration battery, which promotes the corrosion of metal materials. In addition, due to the anoxic environment between the metal surface and the sediment, sulfate-reducing bacteria can multiply, thereby accelerating the microbial corrosion of metal materials, seriously affecting the heat exchange efficiency of the equipment, the increase in energy consumption, and the blockage of pipelines. Therefore, the application of corrosion inhibitors has attracted people's attention.

In order to maintain the heat exchange efficiency of the heat exchange equipment, prolong the service life of the cooling water system equipment, and improve the circulation utilization rate of the cooling water, the most common method at present is to add a certain amount of water quality stabilizer-scale inhibitor to the circulating cooling water system. Corrosion inhibitor. In the early stage of circulating cooling water treatment, the scaling of the water was generally controlled by adding acid to adjust the pH value of the water to 6.0-6.5, and then adding a corrosion inhibitor to control the corrosion of the equipment; in order to save water, the circulating cooling water is currently high. The development of concentration ratio technology has been developed from simple acid addition and low pH operation control, to the addition of scale and corrosion inhibitors combined with high pH and other alkaline treatment methods, but this method is more likely to cause scaling in the cooling system, so it must rely on high efficiency. Development and application of scale and corrosion inhibitors.

At present, some scale and corrosion inhibitors have also been developed in my country. The development of scale and corrosion inhibitors for circulating cooling water systems has experienced a development process from inorganic to organic, from high phosphorus, low phosphorus to no phosphating. In the future, circulating cooling water resistance The development of scale and corrosion inhibitors follows the sustainable development strategy, and greening is undoubtedly the central strategy for the development of scale and corrosion inhibitors, as well as the research and development direction of scale and corrosion inhibitors. Corrosion and scale inhibition are two inseparable processes, and the corrosion inhibitor and scale inhibitor should have a synergistic effect. In circulating cooling water, the coordination of corrosion inhibitor and scale inhibitor is very important. If you simply mix several scale inhibitors and corrosion inhibitors together, it may cause new problems, not only causing production Waste of materials, but also easy to reduce the efficacy of the drug, or even completely ineffective. Therefore, the development of compound agents with dual functions of scale and corrosion inhibition has significant economic and social benefits. In recent years, with the increasingly strict environmental regulations formulated by the state, higher requirements have been placed on the scale and corrosion inhibitors in the circulating water treatment system. Therefore, the main direction of future research should be the development of biodegradable and Green polymer scale inhibitor with excellent scale and corrosion inhibition performance.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a scale and corrosion inhibitor and a preparation method thereof. The scale and corrosion inhibitor is a scale and corrosion inhibitor for preventing the corrosion of pipelines and equipment, and is especially suitable for water pipelines and corrosion inhibitors during long-term operation. in some devices. The scale and corrosion inhibitor has dual functions of scale and corrosion inhibition, can slow down the corrosion inhibition efficiency of pipelines and equipment, and is a compound agent. The scale and corrosion inhibitor has a certain degree of biodegradability, and the raw material is a polymer with excellent scale and corrosion inhibition performance, which is green and environmentally friendly. The scale and corrosion inhibitor has a wide application range, has a strong corrosion inhibition effect, and has a good effect on the corrosion of pipelines and equipment.

The scale and corrosion inhibitor of the present invention is composed of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) aqueous solution, 2-hydroxyphosphonoacetic acid (HPAA) aqueous solution, acrylic acid/acrylate copolymer (HB-901) aqueous solution, polyaspartic acid (PASP) aqueous solution and foam discharging agent;

Wherein, the concentration of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) aqueous solution is 30～40mg/L; the concentration of 2-hydroxyphosphonoacetic acid (HPAA) aqueous solution is 20～30mg/L; The concentration of acrylic acid/acrylate copolymer (HB-901) aqueous solution is 15～20mg/L; the concentration of polyaspartic acid (PASP) aqueous solution is 20～30mg/L;

Among them, according to the amount of substances, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA): 2-hydroxyphosphonoacetic acid (HPAA): acrylic acid/acrylate copolymer (HB-901): Polyaspartic acid (PASP): foam discharge agent = (2-3): (2-3): (5-8): (10-15): (5-8);

The foam discharge agent is composed of sodium lauryl sulfate (K12) aqueous solution, potassium laurate aqueous solution, fatty alcohol polyoxyethylene ether sodium sulfate (AES) aqueous solution, sodium dodecylbenzenesulfonate (LAS) aqueous solution, methyl alcohol Diethanolamine (MDEA) aqueous solution and coconut oil fatty acid (CDEA) aqueous solution;

in,

The concentration of sodium lauryl sulfate (K12) aqueous solution is 8～10mg/L, the concentration of potassium laurate aqueous solution is 8～10mg/L, the concentration of fatty alcohol polyoxyethylene ether sodium sulfate (AES) aqueous solution is 8～10mg /L, the concentration of sodium dodecylbenzenesulfonate (LAS) aqueous solution is 8～10mg/L, the concentration of methyldiethanolamine (MDEA) aqueous solution is 12～15mg/L, the concentration of coconut oil fatty acid (CDEA) aqueous solution It is 1.5～2mg/L.

According to the volume ratio of the aqueous solution, sodium lauryl sulfate: potassium laurate: fatty alcohol polyoxyethylene ether sodium sulfate: sodium dodecylbenzenesulfonate: methyldiethanolamine: coconut oil fatty acid = (1.5～2): (1.5-2): (1.5-2): (1.5-2): (0.8-1.2): (0.8-1.2).

Wherein, the above-mentioned volume ratio of the aqueous solution refers to the volume ratio of each component to prepare an aqueous solution.

The foam discharge agent is a kind of high-efficiency surfactant, on the basis of maintaining the corrosion inhibition effect, it enhances the mobility and permeability of molecules, and reduces the potential energy barrier of the metal surface; the foam discharge agent can inhibit scale and corrosion. The agent forms bubbles in the pipeline and covers the metal inner wall of the pipeline or equipment. The scale and corrosion inhibitor is in liquid phase at normal temperature and pressure. The bubble discharge agent can promote the liquid scale and corrosion inhibitor to form dense bubbles covering the pipeline or equipment surface to protect the metal in the pipeline or equipment.

The methyldiethanolamine can increase the viscosity of the liquid and ensure that the foam unloading agent becomes alkaline, and the methyldiethanolamine is a good solvent for aliphatic alcohol polyoxyethylene ether sodium sulfate (AES).

The coconut oil fatty acid is a kind of nonionic surfactant, which is easily soluble in water. At room temperature and normal pressure, the fatty alcohol polyoxyethylene ether sodium sulfate (AES) and methyldiethanolamine (MDEA) are compounded in equal proportions. Finally, coconut oil fatty acid acts as a foam stabilizer to synthesize a foam discharge agent.

Said 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA), 2-hydroxyphosphonoacetic acid (HPAA), acrylic acid/acrylate copolymer (HB-901) and polyaspartic acid (PASP) are formulated into aqueous solutions before use.

The preparation method of the scale and corrosion inhibitor of the present invention is carried out according to the following steps:

Step 1, prepare the mixed solution

According to the ratio, mix 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) and 2-hydroxyphosphonoacetic acid (HPAA), stir evenly at 45-55°C, and then add acrylic acid/acrylic acid The ester copolymer (HB-901) is mixed and stirred evenly to obtain a mixed solution;

Step 2, prepare foam discharge agent

Mix sodium lauryl sulfate (K12), potassium laurate, aliphatic alcohol polyoxyethylene ether sulfate (AES) and sodium dodecylbenzenesulfonate (LAS) according to the foam release agent ratio, and then, Add methyldiethanolamine and coconut oil fatty acid to prepare foam discharge agent;

Step 3, add the mixed solution to the polyaspartic acid aqueous solution, react at 50-60 °C for 50-60 min, then add the prepared foam unloading agent, after fully dissolving, stir at 40-50 °C for 5-6 h to prepare the solution. Scale and corrosion inhibitors are obtained.

in,

In the step 1, the mixing process is specifically:

First pour 2-phosphonobutane-1,2,4-tricarboxylic acid into the beaker, then add 2-hydroxyphosphonoacetic acid (HPAA), put the beaker in a constant temperature water bath at 45～55℃, stir for 50～ After 60min, the solution was fully mixed, then the solution of acrylic acid/acrylate copolymer (HB-901) was added, and the mixture was continuously stirred for 50-60min to obtain a mixed solution.

In the step 3, the equipment used for stirring is a magnetic heating stirrer, and the stirring rate is 1500-2000 rpm;

In described step 3, described polyaspartic acid (PASP), the concrete steps of its synthesis are:

(1) In a molar ratio, ammonium salt: maleic anhydride=(1～1.2):(0.8～1) weighed, and ammonium salt and maleic anhydride (C ₄ H ₂ O ₃ ) were separately prepared into powders , put it into a small beaker, stir evenly, and then move it into a three-necked flask;

Put the three-necked flask in an oil bath, react at 140-160°C for 2-3 hours, take it out, and cool it to 65-70°C to obtain a cooled mixture;

(2) Pour the cooled mixture into a beaker, add distilled water, stir evenly to make it solid; wherein, according to the amount of substance, water: ammonium salt=(4.2～5.5):(1～1.2);

The beaker was placed in a water bath, kept at a constant temperature of 90°C, and evaporated to dryness to obtain a white solid;

Put the beaker containing the white solid in an oil bath, heat at 110-120°C for 1-2 hours, and dry to constant weight to obtain polysuccinimide;

(3) Put the beaker in a water bath at 50～90℃, add 30～40mL NaOH solution with a concentration of 3～4mol/L to the polysuccinimide, and hydrolyze it for 1～2h, when the pH value is 8.5～10 , the hydrolysis is complete, and the dark reddish brown solution is obtained, which is the polyaspartic acid sodium salt solution;

(4) add dilute hydrochloric acid to the polyaspartic acid sodium salt solution, according to the amount of material, polyaspartic acid sodium salt: dilute hydrochloric acid=1:1; adjust the pH value to be neutral, namely obtain polyaspartic acid Aqueous acid solution;

In described step (1), described ammonium salt is a kind of in ammonium carbonate;

In the step (1), a small medicine spoon is used for the uniform stirring.

The prepared scale and corrosion inhibitor can be directly added to pipelines and equipment for use.

Compared with the prior art, the scale and corrosion inhibitor of the present invention has the following beneficial effects:

(1) the scale and corrosion inhibitor of the present invention has a lower cost and is easy to configure;

(2) The scale and corrosion inhibitor of the present invention has better corrosion resistance effect on pipelines and equipment, and is suitable for pipelines of various pipes;

(3) The scale and corrosion inhibitor of the present invention is non-toxic, does not pollute the environment, and is a new type of green corrosion inhibitor;

(4) The scale and corrosion inhibitor of the present invention can form bubbles in the pipeline to cover the inner wall of the metal, which is a liquid phase at normal temperature and pressure. Metal adsorption cannot be achieved in a large area, which limits its use. The invention solves this problem by adding a foam unloading agent. The foam unloading agent is a kind of high-efficiency surfactant. On the basis of maintaining the corrosion inhibition effect, it enhances the molecular movement ability and permeability, reduces the potential energy barrier on the metal surface, and promotes The liquid scale and corrosion inhibitor forms dense bubbles covering the surface of the pipeline or equipment to achieve the purpose of protecting the metal in the pipeline or equipment.

(5) The scope of application of the present invention is relatively wide, that is, it is suitable for high temperature, high hardness, high alkalinity, high pH value and pipelines and equipment requiring high concentration multiples, and is also suitable for low temperature, low hardness, low alkalinity and In pipelines with low pH value, and this corrosion inhibitor is not easy to form insoluble organic calcium phosphate. At the same time, it has strong corrosion inhibition effect, and the compound use of scale and corrosion inhibitor can achieve better scale and corrosion inhibition effect.

Description of drawings

Fig. 1 is a schematic diagram of adsorption of scale and corrosion inhibitor on metal pipe wall;

Detailed ways

The present invention will be further described in detail below in conjunction with the examples.

In the present invention, unless otherwise specified, the equipment and raw materials used are all commercially available.

In the following examples, the schematic diagram of the adsorption of the prepared scale and corrosion inhibitor into the metal pipeline is shown in Figure 1.

Example 1

A scale and corrosion inhibitor composed of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) aqueous solution, 2-hydroxyphosphonoacetic acid (HPAA) aqueous solution, acrylic acid/acrylate copolymer (HB- 901) Aqueous solution, polyaspartic acid (PASP) aqueous solution and foam discharging agent are prepared;

Among them, according to the amount of substances, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA): 2-hydroxyphosphonoacetic acid (HPAA): acrylic acid/acrylate copolymer (HB-901): Polyaspartic acid (PASP): foam release agent = 2:2:5:10:5;

2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA), 2-hydroxyphosphonoacetic acid (HPAA), acrylic acid/acrylate copolymer (HB-901) and polyaspartic acid (PASP) Before use, they are all formulated into an aqueous solution;

Among them, the concentration of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) aqueous solution is 30mg/L; the concentration of 2-hydroxyphosphonoacetic acid (HPAA) aqueous solution is 20mg/L; acrylic acid/acrylate The concentration of copolymer (HB-901) aqueous solution is 15mg/L; the concentration of polyaspartic acid (PASP) aqueous solution is 20mg/L;

The foam discharge agent is composed of sodium lauryl sulfate (K12) aqueous solution, potassium laurate aqueous solution, fatty alcohol polyoxyethylene ether sodium sulfate (AES) aqueous solution, sodium dodecylbenzenesulfonate (LAS) aqueous solution, methyl alcohol Diethanolamine (MDEA) aqueous solution and coconut oil fatty acid (CDEA) aqueous solution;

in,

The concentration of sodium lauryl sulfate (K12) aqueous solution is 10 mg/L, the concentration of potassium laurate aqueous solution is 10 mg/L, the concentration of fatty alcohol polyoxyethylene ether sodium sulfate (AES) aqueous solution is 10 mg/L, the concentration of dodecane The concentration of sodium benzenesulfonate (LAS) aqueous solution is 10 mg/L, the concentration of methyldiethanolamine (MDEA) aqueous solution is 15 mg/L, and the concentration of coconut oil fatty acid (CDEA) aqueous solution is 2 mg/L.

According to the volume ratio of aqueous solution, sodium lauryl sulfate: potassium laurate: fatty alcohol polyoxyethylene ether sodium sulfate: sodium dodecylbenzene sulfonate: methyldiethanolamine: coconut oil fatty acid = 2:2:2:2 :1:1.

Polyaspartic acid (PASP), the concrete steps of its synthesis are:

(1) In a molar ratio, ammonium carbonate: maleic anhydride=1.2:1 is weighed, and 0.24 mol of ammonium carbonate and 0.2 mol of maleic anhydride (C ₄ H ₂ O ₃ ) are respectively developed into powders, put into In a small beaker, use a small medicine spoon, stir evenly, and transfer it into a three-necked flask;

Put the three-necked flask in an oil bath, react at 140°C for 3 hours, take it out, and cool it to 70°C to obtain a cooled mixture;

(2) Pour the cooled mixture into a beaker, add 15 mL of distilled water, and stir to make it solid;

The beaker was placed in a water bath to maintain a constant temperature of 90°C, and the water was evaporated to obtain a white solid;

The beaker containing the white solid was placed in an oil bath, heated at 110°C for 2 hours, and dried to constant weight to obtain polysuccinimide;

(3) Put the beaker in a water bath at 90°C, add 30 mL of NaOH solution with a concentration of 4 mol/L to the polysuccinimide, and hydrolyze it for 1 h. When the pH value is 9.5, the hydrolysis is complete, and a dark reddish-brown solution is obtained, which is Polyaspartic acid sodium salt solution;

(4) adding dilute hydrochloric acid in the amount of polyaspartic acid sodium salt and other substances into the polyaspartic acid sodium salt solution, and adjusting the pH value to be neutral to obtain a polyaspartic acid aqueous solution.

A preparation method of a scale and corrosion inhibitor is carried out according to the following steps:

Step 1, prepare the mixed solution

According to the ratio, first pour 2-phosphonobutane-1,2,4-tricarboxylic acid into the beaker, then add 2-hydroxyphosphonoacetic acid (HPAA), put the beaker in a 45°C constant temperature water bath, and stir For 60min, the solution was fully mixed, then the solution of acrylic acid/acrylate copolymer (HB-901) was added, and stirring was continued for 60min to obtain a mixed solution.

Step 2, prepare foam discharge agent

Mix sodium lauryl sulfate (K12), potassium laurate, aliphatic alcohol polyoxyethylene ether sulfate (AES) and sodium dodecylbenzenesulfonate (LAS) according to the foam release agent ratio, and then, Add methyldiethanolamine and coconut oil fatty acid to prepare foam discharge agent;

Step 3, add the mixed solution to the polyaspartic acid aqueous solution, react at 50°C for 60min, then add the prepared foam unloading agent, after fully dissolving, at 50°C, heat the stirrer with a magnetic force, and the stirring rate is 1500 rpm , stirred for 6h to obtain scale and corrosion inhibitor.

Example 2

A scale and corrosion inhibitor composed of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) aqueous solution, 2-hydroxyphosphonoacetic acid (HPAA) aqueous solution, acrylic acid/acrylate copolymer (HB- 901) Aqueous solution, polyaspartic acid (PASP) aqueous solution and foam discharging agent are prepared;

Among them, according to the amount of substances, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA): 2-hydroxyphosphonoacetic acid (HPAA): acrylic acid/acrylate copolymer (HB-901): Polyaspartic acid (PASP): foam release agent = 3:3:8:15:8;

2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA), 2-hydroxyphosphonoacetic acid (HPAA), acrylic acid/acrylate copolymer (HB-901) and polyaspartic acid (PASP) Before use, they are all formulated into an aqueous solution;

Among them, the concentration of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) aqueous solution is 40mg/L; the concentration of 2-hydroxyphosphonoacetic acid (HPAA) aqueous solution is 30mg/L; acrylic acid/acrylate The concentration of the copolymer (HB-901) aqueous solution is 20 mg/L; the concentration of the polyaspartic acid (PASP) aqueous solution is 30 mg/L;

The foam discharge agent is composed of sodium lauryl sulfate (K12) aqueous solution, potassium laurate aqueous solution, fatty alcohol polyoxyethylene ether sodium sulfate (AES) aqueous solution, sodium dodecylbenzenesulfonate (LAS) aqueous solution, methyl alcohol Diethanolamine (MDEA) aqueous solution and coconut oil fatty acid (CDEA) aqueous solution;

in,

The concentration of sodium lauryl sulfate (K12) aqueous solution is 8 mg/L, the concentration of potassium laurate aqueous solution is 8 mg/L, the concentration of fatty alcohol polyoxyethylene ether sodium sulfate (AES) aqueous solution is 8 mg/L, the concentration of dodecane The concentration of sodium benzenesulfonate (LAS) aqueous solution is 8 mg/L, the concentration of methyldiethanolamine (MDEA) aqueous solution is 12 mg/L, and the concentration of coconut oil fatty acid (CDEA) aqueous solution is 1.5 mg/L.

According to the volume ratio of aqueous solution, sodium lauryl sulfate: potassium laurate: fatty alcohol polyoxyethylene ether sodium sulfate: sodium dodecylbenzenesulfonate: methyldiethanolamine: coconut oil fatty acid = 1.5:1.5:1.5:1.5 : 0.8: 0.8.

Polyaspartic acid (PASP), the concrete steps of its synthesis are:

(1) In a molar ratio, ammonium carbonate: maleic anhydride=1.2:1 is weighed, and 0.24 mol of ammonium carbonate and 0.2 mol of maleic anhydride (C ₄ H ₂ O ₃ ) are respectively developed into powders, put into In a small beaker, use a small medicine spoon, stir evenly, and transfer it into a three-necked flask;

Put the three-necked flask in an oil bath, react at 160°C for 2 hours, take it out, and cool it to 65°C to obtain a cooled mixture;

(2) Pour the cooled mixture into a beaker, add 20 mL of distilled water, and stir to make it solid;

The beaker was placed in a water bath to maintain a constant temperature of 90°C, and the water was evaporated to obtain a white solid;

The beaker containing the white solid was placed in an oil bath, heated at 120°C for 1 h, and dried to constant weight to obtain polysuccinimide;

(3) Put the beaker in a water bath at 50 °C, add 40 mL of NaOH solution with a concentration of 3 mol/L to the polysuccinimide for 2 hours, and hydrolyze it for 2 hours. When the pH value is 8.5, the hydrolysis is complete, and a dark reddish-brown solution is obtained. That is polyaspartic acid sodium salt solution;

(4) adding dilute hydrochloric acid in the amount of polyaspartic acid sodium salt and other substances into the polyaspartic acid sodium salt solution, and adjusting the pH value to be neutral to obtain a polyaspartic acid aqueous solution.

A preparation method of a scale and corrosion inhibitor is carried out according to the following steps:

Step 1, prepare the mixed solution

According to the ratio, first pour 2-phosphonobutane-1,2,4-tricarboxylic acid into the beaker, then add 2-hydroxyphosphonoacetic acid (HPAA), put the beaker in a constant temperature water bath at 55°C, and stir For 50min, the solution was fully mixed, then the solution of acrylic acid/acrylate copolymer (HB-901) was added, and the stirring was continued for 50min to obtain a mixed solution.

Step 2, prepare foam discharge agent

Mix sodium lauryl sulfate (K12), potassium laurate, aliphatic alcohol polyoxyethylene ether sulfate (AES) and sodium dodecylbenzenesulfonate (LAS) according to the foam release agent ratio, and then, Add methyldiethanolamine and coconut oil fatty acid to prepare foam discharge agent;

Step 3, add the mixed solution into the polyaspartic acid aqueous solution, react at 60°C for 50min, then add the prepared foam release agent, after fully dissolving, at 40°C, heat the stirrer with a magnetic force, and the stirring rate is 2000 rpm , and stirred for 6h to obtain a scale and corrosion inhibitor.

Example 3

A scale and corrosion inhibitor composed of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) aqueous solution, 2-hydroxyphosphonoacetic acid (HPAA) aqueous solution, acrylic acid/acrylate copolymer (HB- 901) Aqueous solution, polyaspartic acid (PASP) aqueous solution and foam discharging agent are prepared;

Among them, according to the amount of substances, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA): 2-hydroxyphosphonoacetic acid (HPAA): acrylic acid/acrylate copolymer (HB-901): Polyaspartic acid (PASP): foam release agent = 2:3:8:12:8;

Said 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA), 2-hydroxyphosphonoacetic acid (HPAA), acrylic acid/acrylate copolymer (HB-901) and polyaspartic acid (PASP) are prepared into aqueous solutions before use;

Among them, the concentration of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) aqueous solution is 30mg/L; the concentration of 2-hydroxyphosphonoacetic acid (HPAA) aqueous solution is 20mg/L; acrylic acid/acrylate The concentration of copolymer (HB-901) aqueous solution is 15mg/L; the concentration of polyaspartic acid (PASP) aqueous solution is 30mg/L;

The foam discharge agent is composed of sodium lauryl sulfate (K12) aqueous solution, potassium laurate aqueous solution, fatty alcohol polyoxyethylene ether sodium sulfate (AES) aqueous solution, sodium dodecylbenzenesulfonate (LAS) aqueous solution, methyl alcohol Diethanolamine (MDEA) aqueous solution and coconut oil fatty acid (CDEA) aqueous solution;

in,

The concentration of sodium lauryl sulfate (K12) aqueous solution is 10 mg/L, the concentration of potassium laurate aqueous solution is 10 mg/L, the concentration of fatty alcohol polyoxyethylene ether sodium sulfate (AES) aqueous solution is 10 mg/L, the concentration of dodecane The concentration of sodium benzenesulfonate (LAS) aqueous solution is 10 mg/L, the concentration of methyldiethanolamine (MDEA) aqueous solution is 15 mg/L, and the concentration of coconut oil fatty acid (CDEA) aqueous solution is 2 mg/L.

According to the volume ratio of aqueous solution, sodium lauryl sulfate: potassium laurate: fatty alcohol polyoxyethylene ether sodium sulfate: sodium dodecylbenzene sulfonate: methyldiethanolamine: coconut oil fatty acid = 2:2:2:2 : 1.2: 1.2.

Polyaspartic acid (PASP), the concrete steps of its synthesis are:

(1) In a molar ratio, ammonium carbonate: maleic anhydride=1:0.8 is weighed, and 0.2 mol of ammonium carbonate and 0.16 mol of maleic anhydride (C ₄ H ₂ O ₃ ) are respectively developed into powders, put into In a small beaker, use a small medicine spoon, stir evenly, and transfer it into a three-necked flask;

Put the three-necked flask into an oil bath, react at 150°C for 2 hours, take it out, and cool it to 70°C to obtain a cooled mixture;

(2) Pour the cooled mixture into a beaker, add 15 mL of distilled water, and stir to make it solid;

The beaker was placed in a water bath to maintain a constant temperature of 90°C, and the water was evaporated to obtain a white solid;

The beaker containing the white solid was placed in an oil bath, heated at 110°C for 2 hours, and dried to constant weight to obtain polysuccinimide;

(3) Put the beaker in a water bath at 90°C, add 40 mL of 3 mol/L NaOH solution to the polysuccinimide for hydrolysis for 2 hours, when the pH value is 10, the hydrolysis is complete, and a dark reddish-brown solution is obtained, That is, polyaspartic acid sodium salt solution;

(4) adding dilute hydrochloric acid in the amount of polyaspartic acid sodium salt and other substances into the polyaspartic acid sodium salt solution, and adjusting the pH value to be neutral to obtain a polyaspartic acid aqueous solution.

A preparation method of a scale and corrosion inhibitor is carried out according to the following steps:

Step 1. Prepare the mixed solution

According to the ratio, first pour 2-phosphonobutane-1,2,4-tricarboxylic acid into the beaker, then add 2-hydroxyphosphonoacetic acid (HPAA), put the beaker into a 50°C constant temperature water bath, and stir After 55min, the solution was fully mixed, then the solution of acrylic acid/acrylate copolymer (HB-901) was added, and the stirring was continued for 60min to obtain a mixed solution.

Step 2, prepare foam discharge agent

Mix sodium lauryl sulfate (K12), potassium laurate, aliphatic alcohol polyoxyethylene ether sulfate (AES) and sodium dodecylbenzenesulfonate (LAS) according to the foam release agent ratio, and then, Add methyldiethanolamine and coconut oil fatty acid to prepare foam discharge agent;

Step 3, add the mixed solution to the polyaspartic acid aqueous solution, react at 50°C for 60min, then add the prepared foam unloading agent, after fully dissolving, at 50°C, heat the stirrer with a magnetic force, and the stirring speed is 2000 r/min , and stirred for 6h to obtain a scale and corrosion inhibitor.

Claims (6)

1. a scale and corrosion inhibitor, it is characterized in that, described scale and corrosion inhibitor is made of 2-phosphonobutane-1,2,4-tricarboxylic acid aqueous solution, 2-hydroxyphosphonoacetic acid aqueous solution, model It is prepared from acrylic acid/acrylate copolymer aqueous solution, polyaspartic acid aqueous solution and foam discharge agent of HB-901; The concentration of the 2-phosphonobutane-1,2,4-tricarboxylic acid aqueous solution is 30~40mg/L; the concentration of the 2-hydroxyphosphonoacetic acid aqueous solution is 20~30mg/L; the model is HB-901 The concentration of the acrylic acid/acrylate copolymer aqueous solution is 15~20mg/L; the concentration of the polyaspartic acid aqueous solution is 20~30mg/L; Among them, according to the amount of substances, 2-phosphonobutane-1,2,4-tricarboxylic acid: 2-hydroxyphosphonoacetic acid: acrylic acid/acrylate copolymer with model HB-901: polyaspartic acid : Foaming agent=(2~3):(2~3):(5~8):(10~15):(5~8); The foam discharge agent is composed of sodium lauryl sulfate aqueous solution, potassium laurate aqueous solution, fatty alcohol polyoxyethylene ether sodium sulfate aqueous solution, sodium dodecylbenzenesulfonate aqueous solution, methyldiethanolamine aqueous solution and coconut oil fatty acid aqueous solution. be made of; The concentration of described sodium lauryl sulfate aqueous solution is 8～10mg/L, the concentration of potassium laurate aqueous solution is 8～10mg/L, the concentration of fatty alcohol polyoxyethylene ether sodium sulfate aqueous solution is 8～10mg/L, The concentration of the sodium dodecylbenzenesulfonate aqueous solution is 8~10mg/L, the concentration of the methyldiethanolamine aqueous solution is 12~15mg/L, and the concentration of the coconut oil fatty acid aqueous solution is 1.5~2mg/L; According to the volume ratio of aqueous solution, sodium lauryl sulfate: potassium laurate: fatty alcohol polyoxyethylene ether sodium sulfate: sodium dodecylbenzene sulfonate: methyldiethanolamine: coconut oil fatty acid = (1.5~2): ( 1.5~2):(1.5~2):(1.5~2):(0.8~1.2):(0.8~1.2). 2. the preparation method of scale and corrosion inhibitor according to claim 1, is characterized in that, carry out according to the following steps: Step 1. Prepare the mixed solution According to the ratio, mix 2-phosphonobutane-1,2,4-tricarboxylic acid and 2-hydroxyphosphonoacetic acid, stir evenly at 45~55℃, and then add acrylic acid/acrylic acid with model HB-901 The ester copolymer is mixed and stirred evenly to obtain a mixed solution; Step 2, prepare foam discharge agent Mix sodium lauryl sulfate, potassium laurate, fatty alcohol polyoxyethylene ether sulfate and sodium dodecyl benzene sulfonate according to the ratio of foam discharge agent, then add methyldiethanolamine and coconut oil fatty acid , the preparation of foam discharge agent; Step 3, add the mixed solution to the polyaspartic acid aqueous solution, react at 50-60 °C for 50-60 min, then add the prepared foaming agent, after fully dissolving, stir at 40-50 °C for 5-6 h to prepare the solution. Scale and corrosion inhibitors are obtained. 3. The preparation method of the scale and corrosion inhibitor according to claim 2, characterized in that, in the step 1, the mixing process, specifically, firstly mixes 2-phosphonobutane-1,2,4 -Pour the tricarboxylic acid into the beaker, then add 2-hydroxyphosphonoacetic acid, put the beaker into a constant temperature water bath at 45~55°C, stir for 50~60min to fully mix the solution, and then add acrylic acid / HB-901 The solution of the acrylate copolymer was continuously stirred for 50-60 min to obtain a mixed solution. 4. The preparation method of the scale and corrosion inhibitor according to claim 2, characterized in that, in the step 3, the equipment used for stirring is a magnetic heating stirrer, and the stirring rate is 1500-2000 rpm. 5. the preparation method of the scale and corrosion inhibitor of claim 2, is characterized in that, in described step 3, described polyaspartic acid, the concrete steps of its synthesis are: (1) in molar ratio, ammonium salt: maleic anhydride=(1～1.2): (0.8～1) weighing material, ammonium salt and maleic anhydride are separately developed into powder, put into small beaker, stir Transfer to a three-necked flask after uniformity; Put the three-necked flask in an oil bath, react at 140~160°C for 2~3 hours, take it out, and cool it to 65~70°C to obtain a cooled mixture; (2) Pour the cooled mixture into a beaker, add distilled water, stir evenly to make it solid; wherein, according to the amount of substance, water: ammonium salt=(4.2～5.5): (1～1.2); The beaker was placed in a water bath, kept at a constant temperature of 90 °C, and evaporated to dryness to obtain a white solid; Put the beaker containing the white solid in an oil bath, heat at 110~120°C for 1~2h, and dry to constant weight to obtain polysuccinimide; (3) Put the beaker in a water bath at 50~90℃, add 30~40mL NaOH solution with a concentration of 3~4mol/L to the polysuccinimide, and hydrolyze it for 1~2h, when the pH value is 8.5~10 , the hydrolysis is complete, and the dark reddish brown solution is obtained, which is the sodium polyaspartate solution; (4) Add dilute hydrochloric acid to the polyaspartic acid sodium salt solution, according to the amount of the substance, polyaspartic acid sodium salt: dilute hydrochloric acid=1:1, adjust the pH value to be neutral to obtain polyaspartic acid Acid aqueous solution. 6 . The preparation method of the scale and corrosion inhibitor according to claim 5 , wherein, in the step (1), the ammonium salt is one of ammonium carbonate. 7 .