CN113955866A - Scale and corrosion inhibitor and preparation method thereof - Google Patents
Scale and corrosion inhibitor and preparation method thereof Download PDFInfo
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- CN113955866A CN113955866A CN202111369272.5A CN202111369272A CN113955866A CN 113955866 A CN113955866 A CN 113955866A CN 202111369272 A CN202111369272 A CN 202111369272A CN 113955866 A CN113955866 A CN 113955866A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/105—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances combined with inorganic substances
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
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Abstract
The invention belongs to the field of water treatment, and discloses a scale and corrosion inhibitor and a preparation method thereof, wherein the scale and corrosion inhibitor is prepared from 50-80 wt% of scale inhibitor, 15-20 wt% of corrosion inhibitor and the balance of solvent, and the scale and corrosion inhibitor does not contain raw materials containing phosphorus or zinc elements, so that the problem of environmental pollution caused by the scale and corrosion inhibitor is solved. The scale and corrosion inhibitor provided by the invention is mainly used for treating circulating water, does not contain phosphorus or zinc elements, has small environmental pollution, meets the requirement of environmental protection, and has simple process, low cost and suitability for industrial popularization.
Description
Technical Field
The invention belongs to the technical field of water treatment agents, and particularly relates to a scale and corrosion inhibitor and a preparation method thereof.
Background
Inorganic salt dirt is deposited in an industrial circulating water system very commonly, along with the use of circulating water, the wall surface of water circulating equipment often has a scaling phenomenon and an equipment corrosion phenomenon, huge loss is caused to various industries, and a scale and corrosion inhibitor is generally used for reducing the scaling phenomenon in the conventional treatment method.
The scale and corrosion inhibitor is a water treatment agent with a compound proportion, generally has a synergistic effect, and can simultaneously reduce the formation of scale and prevent equipment corrosion. The scale and corrosion inhibitor is generally composed of organic phosphorus, copolymer, corrosion inhibitor and the like, has good chemical stability, is not easy to hydrolyze, has excellent corrosion inhibition performance on most metals, has excellent scale and corrosion inhibition dispersion performance on calcium carbonate, calcium phosphate and the like, and has good scale and corrosion inhibition performance. The scale formation can be effectively reduced by adding a small amount of scale and corrosion inhibitor into the circulating water, and the equipment is protected from being corroded.
However, the scale and corrosion inhibitor in the prior art inevitably has certain influence on the environment when in use, and is easy to cause environmental pollution after being discharged after being used. With the increase of environmental awareness of people, the environmental requirements on scale and corrosion inhibitors are higher and higher, and the traditional scale and corrosion inhibitors are not suitable for treating industrial circulating water gradually.
Disclosure of Invention
In order to solve the problem that the scale and corrosion inhibitor in the prior art has great environmental pollution, the embodiment of the application provides the scale and corrosion inhibitor with high environmental friendliness and the preparation method thereof.
One aspect of the embodiments of the application provides a scale and corrosion inhibitor, which is prepared from the following raw materials in percentage by weight: 50-80% of scale inhibitor, 15-20% of corrosion inhibitor and the balance of solvent; the scale inhibitor comprises polyacrylic acid, sulfamic acid and hydroxypropyl methyl cellulose; the raw materials of the scale and corrosion inhibitor do not contain phosphorus element or zinc element.
Preferably, the weight ratio of the polyacrylic acid to the sulfamic acid to the hydroxypropyl methyl cellulose is (2-5): (1-3): (4-8).
Preferably, the corrosion inhibitor comprises at least one of sodium dodecylbenzene sulfonate or benzotriazole.
Preferably, the corrosion inhibitor comprises sodium dodecyl benzene sulfonate and benzotriazole, and the weight ratio of the sodium dodecyl benzene sulfonate to the benzotriazole is (5-10): 1.
another aspect of the embodiments of the present application provides a method for preparing a scale and corrosion inhibitor, including the following steps:
preparing materials: preparing a scale inhibitor, a corrosion inhibitor and a solvent; preparing a premixed solution: adding the scale inhibitor into a solvent, and uniformly mixing to prepare a premixed solution; and (3) preparing a finished product: adding the corrosion inhibitor into the premixed liquid and mixing uniformly to prepare the scale and corrosion inhibitor.
Preferably, in the material preparation step, the weight percentage of the scale inhibitor is 50-80%, the weight percentage of the corrosion inhibitor is 15-20%, and the balance is the solvent.
Preferably, in the preparation step, the scale inhibitor comprises polyacrylic acid, sulfamic acid and hydroxypropyl methyl cellulose, and the corrosion inhibitor comprises sodium dodecyl benzene sulfonate and benzotriazole.
Preferably, the weight ratio of the polyacrylic acid to the sulfamic acid to the hydroxypropyl methyl cellulose is (2-5): (1-3): (4-8), wherein the weight ratio of the sodium dodecyl benzene sulfonate to the benzotriazole is (5-10): 1.
preferably, the preparation step of the premixed liquid is specifically to add the scale inhibitor into the solvent, control the temperature to be 30-50 ℃, and mix for 10-20 minutes to prepare the premixed liquid.
Preferably, the preparation step of the finished product is specifically to add the corrosion inhibitor into the premixed liquid, control the temperature to be 30-50 ℃, and carry out mixing treatment for 50-80 minutes to obtain the finished product of the scale and corrosion inhibitor.
In summary, the embodiment of the present application has at least the following beneficial effects:
1. the raw materials of the scale and corrosion inhibitor provided by the embodiment of the application do not contain elements such as phosphorus or zinc which cause great environmental pollution, the problem that the scale and corrosion inhibitor pollutes the environment when being used and discharged is solved, the influence of the use and the discharge of the scale and corrosion inhibitor on the environment is small, and the environment-friendly concept is met.
2. The preparation method of the scale and corrosion inhibitor provided by the embodiment of the application has simple process, solves the problem of complex preparation of the scale and corrosion inhibitor, has low cost and is beneficial to industrial production.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following embodiments are described in detail and completely with reference to the specific examples. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to examples.
In order to solve the problem that the scale and corrosion inhibitor in the prior art has great environmental pollution, the embodiment of the application provides the scale and corrosion inhibitor which does not contain elements such as phosphorus or zinc, has low toxicity and little environmental pollution, and conforms to the environmental protection concept.
A scale and corrosion inhibitor is prepared from the following raw materials in percentage by weight: 50-80% of scale inhibitor, 15-20% of corrosion inhibitor and the balance of solvent; the scale inhibitor comprises polyacrylic acid, sulfamic acid and hydroxypropyl methyl cellulose; the raw materials of the scale and corrosion inhibitor do not contain phosphorus element or zinc element.
The scale and corrosion inhibitor provided by the embodiment of the application does not contain elements such as phosphorus or zinc, has little pollution to the environment, is suitable for being used in a large amount in treatment of industrial circulating water, and can effectively reduce the pollution to the environment after wastewater discharge. The scale inhibitor mainly plays a role in removing scale and preventing the formation of scale in water treatment, improves the utilization rate of water, reduces the discharge of waste water, improves the heat exchange efficiency and reduces the energy consumption. Polyacrylic acid is a water-soluble high-molecular polymer, can disperse microcrystal or silt of salts such as calcium carbonate and calcium sulfate in water without precipitation, forms a stable complex with metal ions such as calcium and magnesium in water, and has an excellent dispersing effect on insoluble inorganic salts in water so as to achieve the purpose of scale inhibition. Polyacrylic acid as a component in the scale inhibitor can be matched with a corrosion inhibitor to achieve a synergistic effect. The polyacrylic acid has low toxicity and little environmental pollution, and is an ideal raw material of the scale inhibitor. Sulfamic acid is a solid inorganic acid which is non-volatile and odorless, has stable property and good biodegradability, and has little influence on human bodies and environment. The sulfamic acid aqueous solution has the same acidity as strong acids such as hydrochloric acid, sulfuric acid and the like, but has lower corrosivity than sulfuric acid, hydrochloric acid or nitric acid, and can further reduce the corrosion rate after adding the corrosion inhibitor. Sulfamic acid has good cleaning effect on the oxide layer on the metal surface, can carry out various chemical reactions with various inorganic compounds and organic compounds, and the metal salts of the sulfamic acid are all easy to dissolve, so the sulfamic acid and the salts thereof have the effect of preventing barium sulfate from precipitating. The sulfamic acid has good descaling effect, does not corrode metal, and is an excellent metal cleaning agent. The hydroxypropyl methyl cellulose water solution has surface activity, and can prolong the action time of the scale inhibitor, reduce the dosage of the scale inhibitor and improve the use effect of the scale inhibitor as a slow release material in the scale inhibitor. The hydroxypropyl methyl cellulose can prevent dirt from redepositing, and can be matched with a corrosion inhibitor, so that the firmness of the composite film on the metal surface is increased, and the corrosion inhibition effect of the corrosion inhibitor is enhanced. And the hydroxypropyl methyl cellulose is non-toxic and edible, and has almost no influence on the environment when being used in large quantities.
In one embodiment, the weight ratio of polyacrylic acid, sulfamic acid and hydroxypropyl methyl cellulose is (2-5): (1-3): (4-8).
Polyacrylic acid in the scale inhibitor prevents scale deposition, sulfamic acid removes scale, hydroxypropyl methyl cellulose prolongs the action time and helps the corrosion inhibitor to form a film, and all the components need to be matched in a certain proportion to achieve the optimal scale inhibition effect. The sulfamic acid is mainly used for descaling, and usually, if the scale is seriously scaled, the scale is removed in advance, so that the scale inhibitor has a small addition content and does not need to be added in a large amount. The recycled water is used with a gradual increase in metal ion concentration, with the potential for scale generation increasing, thus requiring an appropriate amount of polyacrylic acid to prevent scale deposition. The hydroxypropyl methyl cellulose prolongs the action time, gradually releases polyacrylic acid and sulfamic acid as a slow-release material, prolongs the action time of the scale inhibitor, reduces the dosage of the scale inhibitor, needs a large amount of hydroxypropyl methyl cellulose to coat polyacrylic acid and sulfamic acid, and can enhance the effect of the corrosion inhibitor after being completely dissolved.
In one embodiment, the corrosion inhibitor comprises at least one of sodium dodecylbenzene sulfonate or benzotriazole.
The corrosion inhibitor is usually formed into a film on the surface of the metal to block electrochemical reaction and slow down the corrosion rate of the metal. In the examples of the present application, benzotriazole was used as a film-forming material to form a monomolecular film by adsorption on a metal surface. The strong oxidation resistance of benzotriazole is a very effective corrosion inhibitor, and has excellent corrosion inhibition effect on most metal materials. When the benzotriazole forms a film, the benzotriazole can be matched with hydroxypropyl methyl cellulose and polyacrylic acid to form a firmer film, so that the corrosion inhibition effect of the corrosion inhibitor is further enhanced, and the corrosivity of sulfamic acid can be effectively reduced. When the metal surface is in a clean or active state, benzotriazole can be complexed with metal to form an adsorption film with excellent corrosion inhibition effect, but if corrosion products or scale deposit exists on the metal surface, benzotriazole can hardly form a corrosion inhibition film with good effect, so that the corrosion inhibitor in the embodiment of the application is added with a surfactant to clean and activate the metal surface. The sodium dodecyl benzene sulfonate is an anionic surfactant, is stable to alkali and dilute acid, has a good cleaning effect on metal surfaces, can be adsorbed by the metal surfaces to promote corrosion inhibition components to form films, and has low toxicity and small environmental pollution when used. And because the corrosion inhibition effect of the benzotriazole is reduced in a free chlorine environment, the sodium dodecyl benzene sulfonate serving as an anionic surfactant can also play a role in replacing chloride ions, so that the corrosion inhibition effect of the benzotriazole is prevented from being reduced by the chloride ions.
As an embodiment, the corrosion inhibitor comprises sodium dodecyl benzene sulfonate and benzotriazole, wherein the weight ratio of the sodium dodecyl benzene sulfonate to the benzotriazole is (5-10): 1.
sodium dodecyl benzene sulfonate in the corrosion inhibitor is used for cleaning and activating the metal surface, helps benzotriazole to form a film, and a large amount of the corrosion inhibitor is needed to ensure the cleanness of the metal surface. Relatively speaking, the demand of benzotriazole is reduced after the film is formed on the metal surface, and the loss amount of the circulating water in the using process is only required to be supplemented, so that the content of the corrosion inhibitor is relatively low.
Another aspect of the embodiments of the present application provides a method for preparing a scale and corrosion inhibitor, including the following steps:
preparing materials: preparing a scale inhibitor, a corrosion inhibitor and a solvent; preparing a premixed solution: adding the scale inhibitor into a solvent, and uniformly mixing to prepare a premixed solution; and (3) preparing a finished product: adding the corrosion inhibitor into the premixed liquid and mixing uniformly to prepare the scale and corrosion inhibitor.
The preparation method of the scale and corrosion inhibitor comprises three steps of material preparation, premix liquid preparation and finished product preparation, wherein the material preparation step mainly prepares the required raw materials according to the weight percentage; in the preparation step of the premixed solution, the scale inhibitor and the solvent are uniformly mixed to prepare the premixed solution; and in the finished product preparation step, the premixed solution and the corrosion inhibitor are uniformly mixed to obtain the scale and corrosion inhibitor.
As an implementation mode, in the material preparation step, the weight percentage of the scale inhibitor is 50-80%, the weight percentage of the corrosion inhibitor is 15-20%, and the balance is the solvent.
As an embodiment, in the step of preparing the raw materials, the scale inhibitor comprises polyacrylic acid, sulfamic acid and hydroxypropyl methyl cellulose; the corrosion inhibitor comprises sodium dodecyl benzene sulfonate and benzotriazole.
In one embodiment, the weight ratio of polyacrylic acid, sulfamic acid and hydroxypropyl methyl cellulose is (2-5): (1-3): (4-8), wherein the weight ratio of the sodium dodecyl benzene sulfonate to the benzotriazole is (5-10): 1.
as an implementation mode, the preparation step of the premix liquid is specifically to add the scale inhibitor into the solvent, control the temperature to be 30-50 ℃ and process for 10-20 minutes to prepare the premix liquid.
The scale inhibitor is mixed with a solvent at a certain temperature, polyacrylic acid is water-soluble liquid, sulfamic acid and hydroxypropyl methyl cellulose are water-soluble solids, and the mixture enables the hydroxypropyl methyl cellulose to completely bear the polyacrylic acid and the sulfamic acid. Hydroxypropyl methylcellulose is difficult to dissolve in hot water, so the temperature is controlled during mixing to ensure the solubility of hydroxypropyl methylcellulose.
As an implementation mode, the preparation step of the finished product is specifically that the corrosion inhibitor is added into the premixed liquid, and the temperature is controlled to be 30-50 ℃ for treatment for 50-80 minutes, so that the finished product of the scale and corrosion inhibitor is obtained.
The hydroxypropyl methylcellulose content of the premix is high, and a colloidal mixture is easily formed, so that the sodium dodecyl benzene sulfonate and the benzotriazole need to be mixed with the premix for a longer time.
The present invention will be further described with reference to specific examples, but the present invention is not limited to the examples.
Example 1
The scale and corrosion inhibitor consists of polyacrylic acid 15 wt%, sulfamic acid 10 wt%, hydroxypropyl methyl cellulose 30 wt%, sodium dodecyl benzene sulfonate 15 wt%, benzotriazole 1.5 wt% and deionized water 28.5 wt%.
The preparation method of the scale and corrosion inhibitor comprises the following steps:
preparing materials: preparing polyacrylic acid, sulfamic acid, hydroxypropyl methyl cellulose, sodium dodecyl benzene sulfonate, benzotriazole and ionized water according to the weight percentage of the raw materials;
preparing a premixed solution: adding polyacrylic acid, sulfamic acid, hydroxypropyl methylcellulose and deionized water into a reaction kettle, controlling the temperature to be 30 ℃ and stirring for 10 minutes;
and (3) preparing a finished product: adding sodium dodecyl benzene sulfonate and benzotriazole into the premixed solution, controlling the temperature at 30 ℃, and stirring for 50 minutes to obtain a finished product of the scale and corrosion inhibitor.
Example 2
The scale and corrosion inhibitor consists of polyacrylic acid 20 wt%, sulfamic acid 12 wt%, hydroxypropyl methyl cellulose 35 wt%, sodium dodecyl benzene sulfonate 18 wt%, benzotriazole 2 wt% and deionized water 13 wt%.
The preparation method of the scale and corrosion inhibitor comprises the following steps:
preparing materials: preparing polyacrylic acid, sulfamic acid, hydroxypropyl methyl cellulose, sodium dodecyl benzene sulfonate, benzotriazole and ionized water according to the weight percentage of the raw materials;
preparing a premixed solution: adding polyacrylic acid, sulfamic acid, hydroxypropyl methylcellulose and deionized water into a reaction kettle, controlling the temperature to be 50 ℃ and stirring for 20 minutes;
and (3) preparing a finished product: adding sodium dodecyl benzene sulfonate and benzotriazole into the premixed solution, controlling the temperature at 50 ℃, and stirring for 80 minutes to obtain a finished product of the scale and corrosion inhibitor.
Example 3
The scale and corrosion inhibitor consists of polyacrylic acid 18 wt%, sulfamic acid 15 wt%, hydroxypropyl methyl cellulose 30 wt%, sodium dodecyl benzene sulfonate 16 wt%, benzotriazole 3 wt% and deionized water 18 wt%.
The preparation method of the scale and corrosion inhibitor comprises the following steps:
preparing materials: preparing polyacrylic acid, sulfamic acid, hydroxypropyl methyl cellulose, sodium dodecyl benzene sulfonate, benzotriazole and ionized water according to the weight percentage of the raw materials;
preparing a premixed solution: adding polyacrylic acid, sulfamic acid, hydroxypropyl methylcellulose and deionized water into a reaction kettle, controlling the temperature to be 40 ℃ and stirring for 15 minutes;
and (3) preparing a finished product: adding sodium dodecyl benzene sulfonate and benzotriazole into the premixed solution, controlling the temperature at 40 ℃, and stirring for 60 minutes to obtain a finished product of the scale and corrosion inhibitor.
Example 4
The scale and corrosion inhibitor consists of polyacrylic acid 16 wt%, sulfamic acid 12 wt%, hydroxypropyl methyl cellulose 25 wt%, sodium dodecyl benzene sulfonate 15 wt%, benzotriazole 2 wt% and deionized water 30 wt%.
The preparation method of the scale and corrosion inhibitor comprises the following steps:
preparing materials: preparing polyacrylic acid, sulfamic acid, hydroxypropyl methyl cellulose, sodium dodecyl benzene sulfonate, benzotriazole and ionized water according to the weight percentage of the raw materials;
preparing a premixed solution: adding polyacrylic acid, sulfamic acid, hydroxypropyl methylcellulose and deionized water into a reaction kettle, controlling the temperature to be 40 ℃ and stirring for 20 minutes;
and (3) preparing a finished product: adding sodium dodecyl benzene sulfonate and benzotriazole into the premixed solution, controlling the temperature at 40 ℃, and stirring for 60 minutes to obtain a finished product of the scale and corrosion inhibitor.
Comparative example 1
The scale and corrosion inhibitor consists of polyacrylic acid 15 wt%, sulfamic acid 10 wt%, sodium dodecyl benzene sulfonate 15 wt%, benzotriazole 2 wt% and deionized water 58 wt%.
The preparation method of the scale and corrosion inhibitor comprises the following steps:
preparing materials: preparing polyacrylic acid, sulfamic acid, sodium dodecyl benzene sulfonate, benzotriazole and ionized water according to the weight percentage of the raw materials;
and (3) preparing a finished product: adding polyacrylic acid, sulfamic acid, sodium dodecyl benzene sulfonate, benzotriazole and deionized water into a reaction kettle, controlling the temperature to be 30 ℃ and stirring for 10 minutes to prepare the finished product of the scale and corrosion inhibitor.
Comparative example 2
The scale and corrosion inhibitor consists of polyacrylic acid 15 wt%, hydroxypropyl methyl cellulose 30 wt%, sodium dodecyl benzene sulfonate 15 wt%, benzotriazole 1.5 wt% and deionized water 38.5 wt%.
The preparation method of the scale and corrosion inhibitor comprises the following steps:
preparing materials: preparing polyacrylic acid, hydroxypropyl methyl cellulose, sodium dodecyl benzene sulfonate, benzotriazole and ionized water according to the weight percentage of the raw materials;
preparing a premixed solution: adding polyacrylic acid, hydroxypropyl methylcellulose and deionized water into a reaction kettle, controlling the temperature to be 30 ℃ and stirring for 10 minutes;
and (3) preparing a finished product: adding sodium dodecyl benzene sulfonate and benzotriazole into the premixed solution, controlling the temperature at 30 ℃, and stirring for 50 minutes to obtain a finished product of the scale and corrosion inhibitor. And (3) performance testing: corrosion inhibition performance test, scale inhibition performance test and environmental impact test.
Comparative example 3
The scale and corrosion inhibitor consists of sulfamic acid 10 wt%, hydroxypropyl methyl cellulose 30 wt%, sodium dodecyl benzene sulfonate 15 wt%, benzotriazole 1.5 wt% and deionized water 43.5 wt%.
The preparation method of the scale and corrosion inhibitor comprises the following steps:
preparing materials: preparing sulfamic acid, hydroxypropyl methylcellulose, sodium dodecyl benzene sulfonate, benzotriazole and ionized water according to the weight percentage of the raw materials;
preparing a premixed solution: adding sulfamic acid, hydroxypropyl methylcellulose and deionized water into a reaction kettle, controlling the temperature to be 30 ℃ and stirring for 10 minutes;
and (3) preparing a finished product: adding sodium dodecyl benzene sulfonate and benzotriazole into the premixed solution, controlling the temperature at 30 ℃, and stirring for 50 minutes to obtain a finished product of the scale and corrosion inhibitor.
Comparative example 4
The scale and corrosion inhibitor consists of polyacrylic acid 15 wt%, sulfamic acid 10 wt%, hydroxypropyl methyl cellulose 30 wt%, benzotriazole 1.5 wt% and deionized water 43.5 wt%.
The preparation method of the scale and corrosion inhibitor comprises the following steps:
preparing materials: preparing polyacrylic acid, sulfamic acid, hydroxypropyl methyl cellulose, benzotriazole and ionized water according to the weight percentage of the raw materials;
preparing a premixed solution: adding polyacrylic acid, sulfamic acid, hydroxypropyl methylcellulose and deionized water into a reaction kettle, controlling the temperature to be 30 ℃ and stirring for 10 minutes;
and (3) preparing a finished product: adding benzotriazole into the premixed solution, controlling the temperature at 30 ℃, and stirring for 50 minutes to obtain a finished product of the scale and corrosion inhibitor.
Comparative example 5
The scale and corrosion inhibitor consists of polyacrylic acid 15 wt%, sulfamic acid 10 wt%, hydroxypropyl methyl cellulose 30 wt%, sodium dodecyl benzene sulfonate 15 wt% and deionized water 30 wt%.
The preparation method of the scale and corrosion inhibitor comprises the following steps:
preparing materials: preparing polyacrylic acid, sulfamic acid, hydroxypropyl methyl cellulose, sodium dodecyl benzene sulfonate and ionized water according to the weight percentage of the raw materials;
preparing a premixed solution: adding polyacrylic acid, sulfamic acid, hydroxypropyl methylcellulose and deionized water into a reaction kettle, controlling the temperature to be 30 ℃ and stirring for 10 minutes;
and (3) preparing a finished product: adding sodium dodecyl benzene sulfonate into the premixed solution, controlling the temperature at 30 ℃, and stirring for 50 minutes to obtain a finished product of the scale and corrosion inhibitor.
Comparative example 6
The scale and corrosion inhibitor consists of polyacrylic acid 15 wt%, sulfamic acid 10 wt%, hydroxypropyl methyl cellulose 30 wt%, sodium dodecyl benzene sulfonate 15 wt%, benzotriazole 1.5 wt% and deionized water 28.5 wt%.
The preparation method of the scale and corrosion inhibitor comprises the following steps:
preparing materials: preparing polyacrylic acid, sulfamic acid, hydroxypropyl methyl cellulose, sodium dodecyl benzene sulfonate, benzotriazole and ionized water according to the weight percentage of the raw materials;
preparing a premixed solution: adding polyacrylic acid, sulfamic acid, hydroxypropyl methylcellulose and deionized water into a reaction kettle, controlling the temperature to be 70 ℃ and stirring for 10 minutes;
and (3) preparing a finished product: adding sodium dodecyl benzene sulfonate and benzotriazole into the premixed solution, controlling the temperature at 70 ℃, and stirring for 50 minutes to obtain a finished product of the scale and corrosion inhibitor.
Comparative example 7
The scale and corrosion inhibitor HQ-308 is sold in the market.
Performance testing and results
And (3) performance testing:
1. and (3) corrosion inhibition performance testing: the corrosion rate is calculated according to the change of the weight of the test piece before and after corrosion, the experimental water sample is tap water, the corrosion test piece is a pure zinc test piece (30mm multiplied by 25mm multiplied by 2mm), the experimental temperature is 40 ℃, and the experimental time is 72 hours. Weighing 10 corrosion test pieces, recording data, taking 250ml of experiment water sample, adding 10mg of scale and corrosion inhibitor into the experiment water sample, uniformly mixing, immersing the 10 corrosion test pieces, standing for 72 hours in the experiment water sample, taking out the corrosion test pieces, drying the corrosion test pieces by using absorbent paper, and accurately weighing and recording data. The weight loss is obtained from the average value of the mass difference of the test piece before and after the reaction. Corrosion inhibition efficiency was calculated by dividing the weight loss by the weight before reaction.
2. And (3) testing the scale inhibition performance: carbon determination according to national standard GB/T16632-2019 Water treatment agent Scale inhibition PerformanceCalcium carbonate deposition method for evaluating the scale inhibition performance. The experimental conditions are that 25mL of CaCl with the concentration of 20mg/mL is measured2Adding 1mg of scale and corrosion inhibitor into the solution in a 250mL volumetric flask, and then adding 25mL of NaSO with the concentration of 40mg/mL4A solution prepared at a concentration of
(in CaSO)4Metering) water sample, keeping the temperature of the water sample constant at 80 ℃ for 10 hours, cooling, taking 25mL of water sample into a conical flask, adding 2mL of KOH solution with the concentration of 8mol/L to adjust the pH value to 10, adding a small amount of calcium indicator, titrating by using EDTA standard solution until the solution is changed from purple to blue-green, namely, the end point, simultaneously carrying out a blank experiment, and calculating the scale inhibition rate (V) according to the following formula1-V0)/(V2-V0) X 100% where V1Calibrating the volume of EDTA (ethylene diamine tetraacetic acid) consumed by calcium ion concentration after adding the scale inhibitor and keeping the temperature for 10 hours2The volume of EDTA consumed by calcium ions was calibrated for the unheated blank water sample.
And (3) performance test results: the results of the performance tests of examples 1-4 and comparative examples 1-10 are shown in Table 1 below.
TABLE 1 results of the Performance test of examples 1 to 4 and comparative examples 1 to 10
As can be seen from the data in the table, the scale inhibition rate and the corrosion inhibition rate of the scale and corrosion inhibitors in the examples 1 to 4 are high, compared with the scale and corrosion inhibition effect of the scale and corrosion inhibitor in the market, the scale and corrosion inhibition effect of the scale and corrosion inhibitor in the comparative example 7 is similar, and the examples 1 to 4 do not contain elements such as phosphorus, zinc and the like harmful to the environment, so that the environment-friendly corrosion inhibitor is high in environment friendliness, small in influence on the environment and accords with the green environment protection concept.
Compared with the example 1, the comparative examples 1 to 3 do not add polyacrylic acid, sulfamic acid and hydroxypropyl methyl cellulose in the scale inhibitor respectively, the scale inhibition rate and the corrosion inhibition rate obtained from the data in the table are reduced, the scale inhibition rate is obviously reduced, and the necessity of adding each component in the scale inhibitor is reflected. Compared with the embodiment 1, the comparative examples 4 to 5 do not add sodium dodecyl benzene sulfonate and benzotriazole respectively, and according to data in a table, the corrosion inhibition effect of the scale and corrosion inhibitor is obviously reduced, and particularly the corrosion inhibition effect of the comparative example 5 does not add benzotriazole is greatly reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The scale and corrosion inhibitor is characterized by being prepared from the following raw materials in percentage by weight:
50-80% of scale inhibitor, 15-20% of corrosion inhibitor and the balance of solvent;
the scale inhibitor comprises polyacrylic acid, sulfamic acid and hydroxypropyl methyl cellulose;
the raw materials of the scale and corrosion inhibitor do not contain phosphorus element or zinc element.
2. The scale and corrosion inhibitor according to claim 1, wherein:
the weight ratio of the polyacrylic acid to the sulfamic acid to the hydroxypropyl methyl cellulose is (2-5): (1-3): (4-8).
3. The scale and corrosion inhibitor according to claim 1, wherein:
the corrosion inhibitor comprises at least one of sodium dodecyl benzene sulfonate or benzotriazole.
4. The scale and corrosion inhibitor according to claim 3, wherein:
the corrosion inhibitor comprises sodium dodecyl benzene sulfonate and benzotriazole, wherein the weight ratio of the sodium dodecyl benzene sulfonate to the benzotriazole is (5-10): 1.
5. a preparation method of a scale and corrosion inhibitor is characterized by comprising the following steps:
preparing materials: preparing a scale inhibitor, a corrosion inhibitor and a solvent;
preparing a premixed solution: adding the scale inhibitor into the solvent and uniformly mixing to prepare a premixed solution;
and (3) preparing a finished product: and adding the corrosion inhibitor into the premixed liquid and uniformly mixing to prepare the scale and corrosion inhibitor.
6. The preparation method of the scale and corrosion inhibitor according to claim 5, wherein the preparation method comprises the following steps:
in the material preparation step, the weight percentage of the scale inhibitor is 50-80%, the weight percentage of the corrosion inhibitor is 15-20%, and the balance is the solvent.
7. The preparation method of the scale and corrosion inhibitor according to claim 6, which is characterized in that:
in the material preparation step, the scale inhibitor comprises polyacrylic acid, sulfamic acid and hydroxypropyl methyl cellulose;
the corrosion inhibitor comprises sodium dodecyl benzene sulfonate and benzotriazole.
8. The preparation method of the scale and corrosion inhibitor according to claim 7, which is characterized in that:
the weight ratio of the polyacrylic acid to the sulfamic acid to the hydroxypropyl methyl cellulose is (2-5): (1-3): (4-8);
the weight ratio of the sodium dodecyl benzene sulfonate to the benzotriazole is (5-10): 1.
9. the preparation method of the scale and corrosion inhibitor according to claim 5, wherein the preparation method comprises the following steps:
the preparation method of the premix comprises the specific steps of adding the scale inhibitor into the solvent, controlling the temperature to be 30-50 ℃, and mixing for 10-20 minutes to prepare the premix.
10. The preparation method of the scale and corrosion inhibitor according to claim 5, wherein the preparation method comprises the following steps:
the preparation method of the finished product comprises the specific steps of adding the corrosion inhibitor into the premixed liquid, controlling the temperature to be 30-50 ℃, and mixing for 50-80 minutes to obtain the finished product of the scale and corrosion inhibitor.
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| CN202111369272.5A CN113955866A (en) | 2021-11-15 | 2021-11-15 | Scale and corrosion inhibitor and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115557617A (en) * | 2022-09-29 | 2023-01-03 | 河北省科学院能源研究所 | Reverse osmosis membrane scale and corrosion inhibitor for recycling phosphorus-containing reclaimed water and preparation method thereof |
| CN115571863A (en) * | 2022-10-08 | 2023-01-06 | 广东邦普循环科技有限公司 | Wet-process phosphoric acid scale dissolver and preparation method and application thereof |
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| CN104891682A (en) * | 2015-06-11 | 2015-09-09 | 长沙理工大学 | Environment-friendly and efficient water treatment agent applicable to Cu-Fe sharing system |
| CN108249595A (en) * | 2018-02-11 | 2018-07-06 | 西安晶达化工有限公司 | Non-phosphorus scale and corrosion inhibitor and preparation method thereof |
| CN110104803A (en) * | 2019-05-17 | 2019-08-09 | 江苏精科霞峰环保科技有限公司 | A kind of environment-friendly composite corrosion and scale inhibitor, method of preparation and use |
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| CN104891682A (en) * | 2015-06-11 | 2015-09-09 | 长沙理工大学 | Environment-friendly and efficient water treatment agent applicable to Cu-Fe sharing system |
| CN108249595A (en) * | 2018-02-11 | 2018-07-06 | 西安晶达化工有限公司 | Non-phosphorus scale and corrosion inhibitor and preparation method thereof |
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| CN115571863B (en) * | 2022-10-08 | 2024-02-09 | 广东邦普循环科技有限公司 | Wet phosphoric acid scale-dissolving agent and preparation method and application thereof |
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