Slime stripping agent as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of stripping agents, and particularly relates to a slime stripping agent and a preparation method and application thereof. The slime stripping agent disclosed by the invention is prepared from dodecyl dimethyl benzyl amine bromide, dichlorophenol, isothiazolinone, polyoxyethylene alkylolamide, hydroxyethylidene diphosphonic acid, dimethylformamide and sodium dodecyl benzene sulfonate. Through the combined action of the specific components, the slime stripping agent has good stripping capacity and can rapidly permeate and disintegrate slime, dirt and biological membranes attached to the surface of equipment, the cleanliness and operation efficiency of the equipment are recovered, and equipment blockage and performance reduction caused by slime accumulation are effectively avoided; meanwhile, the high killing effect on sulfate reducing bacteria and nitrifying bacteria is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of stripping agents, and in particular relates to a slime stripping agent and a preparation method and application thereof. Background Art

[0002] Biosludge, formed by heterotrophic bacteria, is primarily composed of suspended colloidal matter in water, bonded to a viscous substance. This presence impedes the proper flow of cooling water, reducing the cooling efficiency of the condenser. Biosludge coats the metal surfaces on the water side of the heat exchanger, preventing corrosion and scale inhibitors from reaching the metal surface and properly inhibiting corrosion and scale, thereby reducing their effectiveness. Biosludge coating the metal surface creates a potential differential, accelerating the corrosion rate. Furthermore, large amounts of sludge, particularly algae, adhere to the surfaces of cooling water system equipment, not only affecting the system's appearance but also potentially clogging heat exchangers and causing anaerobic corrosion.

[0003] To decompose and remove slime, slime strippers are often used. Slime strippers have excellent dispersibility and permeability, strong penetration, low toxicity, and rapid action. They are highly effective at decomposing and stripping slime composed of biological slime, oily sludge, bacterial and algal secretions, and other components. Slime strippers also soften and clean scale from metal surfaces, inhibit corrosion, and improve equipment heat transfer. However, the slime stripping efficiency of traditional slime strippers needs to be further improved, and the bactericidal and stripping components are prone to developing drug resistance, reducing their efficacy. This leaves room for further improvement in the sterilization efficiency of heterotrophic and sulfate-reducing bacteria. Furthermore, the preparation process of traditional slime strippers is complex, with numerous reaction steps, long reaction times, and numerous byproducts, which increases costs for manufacturers. In addition, traditional slime strippers are expensive to prepare and have poor stability. When using them, the amount of slime in the system must be evaluated first, and then the agent is added based on the amount of slime in the system. The general dosage is 150-200ppm, and the addition method is batch addition. A high water flow rate should be ensured during addition, and the stripping time should be more than 10-24 hours. After stripping, the sewage should be discharged in time to avoid secondary deposition of dirt. It is relatively cumbersome to use.

[0004] Therefore, there is an urgent need to develop a slime stripping agent that has good slime stripping rate, heterotrophic bacteria killing rate, sulfate-reducing bacteria killing rate, and a simple preparation process. Summary of the Invention

[0005] The present invention aims to solve one or more technical problems existing in the above-mentioned prior art and at least provide a beneficial alternative. Specifically, the present invention provides a slime stripping agent that has good slime stripping efficiency, sterilization efficiency against heterotrophic bacteria, and sterilization efficiency against sulfate-reducing bacteria, and a simple preparation process.

[0006] The present invention's concept: The present slime stripping agent comprises dodecyldimethylbenzylamine bromide, dichlorophene, isothiazolinone, polyoxyethylene alkylolamide, hydroxyethylene diphosphonic acid, dimethylformamide, and sodium dodecylbenzenesulfonate. Through the combined action of these specific components, the present invention imparts excellent stripping capabilities. It can rapidly penetrate and disintegrate slime, dirt, and biofilm adhering to equipment surfaces, restoring equipment cleanliness and operating efficiency, effectively preventing equipment blockage and performance degradation caused by slime accumulation. Furthermore, the agent exhibits a strong killing effect on sulfate-reducing bacteria and nitrifying bacteria.

[0007] Therefore, a first aspect of the present invention provides a slime remover.

[0008] Specifically, the slime stripping agent includes dodecyldimethylbenzylamine bromide, dichlorophen, isothiazolinone, polyoxyethylene alkylolamide, hydroxyethylene diphosphonic acid (HEDP), dimethylformamide and sodium dodecylbenzenesulfonate.

[0009] Specifically, dodecyldimethylbenzyl ammonium bromide is a cationic surfactant that effectively controls algal growth and slime growth in water. It also exhibits excellent slime removal, dispersion, and penetration properties, as well as degreasing, deodorizing, and corrosion inhibition capabilities. When used for microbial control and cleaning in circulating water systems, it exhibits similar performance to dodecyldimethylbenzylamine chloride. However, due to the replacement of chlorine atoms with bromine atoms in the molecule, its biocidal properties are stronger than dodecyldimethylbenzylamine chloride and its toxicity is lower than that of dodecyldimethylbenzylammonium chloride.

[0010] Dichlorophen is used as a fungicide in agriculture, medicine, and soap manufacturing, and is also an anti-helminthic agent. It is commonly used in cooling water systems of large fertilizer plants. Adding 50-100 ppm of fungicide G-4, whose primary fungicide component is dichlorophen, to a water sample with a pH of 7.8-8.2 can kill over 98% of bacteria within 24 hours. Adding 100 ppm can maintain a kill rate of over 99.65%, extending its effectiveness.

[0011] Isothiazolinone is a fungicide with the chemical formula C8H9C l N2O2S2, primarily composed of 5-chloro-2-methyl-4-isothiazolin-3-one (CIT) and 2-methyl-4-isothiazolin-3-one (MIT), acts as a bactericidal agent by breaking the bonds between bacterial and algal proteins. Upon contact with microorganisms, isothiazolinones rapidly and irreversibly inhibit their growth, leading to cell death. Therefore, they have a strong inhibitory and bactericidal effect on common bacteria, fungi, and algae.

[0012] Polyoxyethylene alkylolamides are produced by the addition reaction of alkylolamides with ethylene oxide. These nonionic surfactants have strong foaming and stabilizing properties and are often used as foam boosters and stabilizers. They offer excellent detergency, solubilization, and thickening properties. Their stability and hydrolysis resistance are superior to those of polyoxyethylene fatty acid esters.

[0013] Hydroxyethylene diphosphonic acid (HEDP) is an organic compound with the molecular formula C2H8O7P2. It is a white crystalline granule that is readily soluble in water, becoming a colorless to pale yellow liquid upon dissolution. It is soluble in methanol and ethanol. It has a large dissociation constant in water and can form stable complexes with metal ions. It can also form stable adducts with compounds containing active oxygen, stabilizing the active oxygen and providing low toxicity. It is primarily used as a scale and corrosion inhibitor for boilers and heat exchangers, a complexing agent for cyanide-free electroplating, a chelating agent for soaps, and a cleaning agent for metals and non-metals. HEDP also exhibits dispersing properties, effectively dispersing suspended solids and sludge in water, preventing them from settling and clogging equipment. This is crucial for maintaining clean and efficient water treatment systems.

[0014] Dimethylformamide is an organic compound with the chemical formula C3H7NO, a colorless, transparent liquid. It is both a widely used chemical raw material and an excellent solvent, capable of mixing with water and most organic solvents. It has excellent solubility for a wide range of organic and inorganic compounds.

[0015] Sodium dodecylbenzenesulfonate is a commonly used anionic surfactant with excellent detergency, foaming, dispersing, emulsifying, and wetting properties. It is widely used as a detergent, foaming agent, wetting agent, emulsifier, and dispersant. However, its hard water resistance is somewhat weak. When used in combination with a chelating agent, its detergency, foaming, dispersing, emulsifying, wetting, and hard water resistance properties are even better. It has a wide range of applications, typically in laundry detergents. Sodium dodecylbenzenesulfonate is a yellow oil that, upon purification, forms strong hexagonal or rhombohedral flaky crystals. It is mildly toxic and has been recognized as a safe chemical raw material by international safety organizations.

[0016] Preferably, the slime stripping agent comprises, by weight, 10-30 parts of dodecyldimethylbenzylamine bromide, 5-20 parts of dichlorophen, 5-25 parts of isothiazolinone, 8-20 parts of polyoxyethylene alkylolamide, 5-25 parts of HEDP, 5-20 parts of dimethylformamide and 8-20 parts of sodium dodecylbenzenesulfonate.

[0017] Further preferably, the slime stripping agent includes, by weight, 15-25 parts of dodecyldimethylbenzylamine bromide, 10-15 parts of dichlorophen, 10-20 parts of isothiazolinone, 12-16 parts of polyoxyethylene alkylolamide, 10-20 parts of HEDP, 8-17 parts of dimethylformamide and 10-18 parts of sodium dodecylbenzenesulfonate.

[0018] More preferably, the slime stripping agent comprises, by weight, 20 parts of dodecyldimethylbenzylamine bromide, 12 parts of dichlorophen, 15 parts of isothiazolinone, 14 parts of polyoxyethylene alkylolamide, 15 parts of HEDP, 12 parts of dimethylformamide and 14 parts of sodium dodecylbenzenesulfonate.

[0019] Preferably, the slime stripping agent further comprises a solvent.

[0020] Preferably, the slime stripping agent comprises, by weight, 10-30 parts of dodecyldimethylbenzylamine bromide, 5-20 parts of dichlorophen, 5-25 parts of isothiazolinone, 8-20 parts of polyoxyethylene alkylolamide, 5-25 parts of HEDP, 5-20 parts of dimethylformamide, 8-20 parts of sodium dodecylbenzenesulfonate and 200-320 parts of solvent.

[0021] Further preferably, the slime stripping agent includes, by weight, 15-25 parts of dodecyldimethylbenzylamine bromide, 10-15 parts of dichlorophen, 10-20 parts of isothiazolinone, 12-16 parts of polyoxyethylene alkylolamide, 10-20 parts of HEDP, 8-17 parts of dimethylformamide, 10-18 parts of sodium dodecylbenzenesulfonate and 220-300 parts of solvent.

[0022] More preferably, the slime stripping agent comprises, by weight, 20 parts of dodecyldimethylbenzylamine bromide, 12 parts of dichlorophen, 15 parts of isothiazolinone, 14 parts of polyoxyethylene alkylolamide, 15 parts of HEDP, 12 parts of dimethylformamide, 14 parts of sodium dodecylbenzenesulfonate and 260 parts of solvent.

[0023] Preferably, the dichlorophen is a dichlorophen solution;

[0024] Preferably, the mass concentration of the dichlorophen solution is less than 70%; further preferably, the mass concentration of the dichlorophen solution is 40-60%.

[0025] Preferably, the solvent of the dichlorophen solution comprises ethanol.

[0026] Preferably, the solvent comprises water.

[0027] The second aspect of the present invention provides a method for preparing the slime stripping agent according to the first aspect of the present invention.

[0028] Specifically, the preparation method of the slime stripping agent comprises the following steps:

[0029] The raw material components of the slime stripping agent are mixed to prepare the slime stripping agent.

[0030] Preferably, the pH after mixing is 6.5-8.0.

[0031] Preferably, polyoxyethylene alkyl alcohol amide and solvent are first mixed evenly, and then dichlorophen solution, dodecyldimethylcarbamylammonium bromide, HEDP and isothiazolinone are added and mixed evenly; then dimethylformamide and sodium dodecylbenzenesulfonate are added and mixed evenly to obtain the slime stripping agent.

[0032] The third aspect of the present invention provides a use of the slime stripping agent described in the first aspect of the present invention in slime treatment.

[0033] Specifically, the dosage of the slime stripping agent of the present invention is 80-150ppm. The addition method can be selected as a one-time addition or batch addition according to actual conditions. After the addition is completed, the circulation pump is started and the system is kept in continuous circulation for more than 8 hours so that the stripping agent can fully act to remove pollutants such as slime from the surface of the equipment.

[0034] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0035] (1) The slime stripping agent of the present invention comprises dodecyldimethylbenzylamine bromide, dichlorophen, isothiazolinone, polyoxyethylene alkylolamide, hydroxyethylene diphosphonic acid, dimethylformamide, and sodium dodecylbenzenesulfonate. The present invention provides a slime stripping agent with excellent stripping ability through the combined action of specific components. The slime stripping agent can rapidly penetrate and disintegrate slime, dirt, and biofilm attached to the surface of equipment, thereby restoring the cleanliness and operating efficiency of the equipment and effectively preventing equipment blockage and performance degradation caused by slime accumulation. Furthermore, the slime stripping agent has a strong killing effect on sulfate-reducing bacteria and nitrifying bacteria.

[0036] (2) The slime stripping agent of the present invention is environmentally friendly, low in toxicity and harmless. While ensuring efficient stripping effects, it can reduce the negative impact on the ecological environment, meeting the requirements of green development of modern industry. In addition, the slime stripping agent of the present invention has a wide range of applications and can be used in various industrial water treatment scenarios such as cooling towers, circulating water systems, and pipelines. It can effectively solve slime problems in different environments and improve the efficiency and stability of overall water treatment.

[0037] (3) The slime stripping agent of the present invention has a simple preparation process, is easy to use, and is flexible to operate. It can easily handle pretreatment, daily maintenance, and emergency treatment, greatly saving manpower and time costs. DETAILED DESCRIPTION

[0038] In order to make the technical solution of the present invention more clearly understood by those skilled in the art, the following examples are given for illustration. It should be noted that the following examples do not limit the scope of protection claimed by the present invention.

[0039] Unless otherwise specified, the raw materials, reagents, or devices used in the following examples can be obtained from conventional commercial sources or by existing known methods.

[0040] Example 1

[0041] A slime stripping agent is composed of the following raw material components, measured by weight: 12 parts of polyoxyethylene alkylolamide, 10 parts of dichlorophen solution, 15 parts of dodecyldimethylcarbamylammonium bromide, 10 parts of HEDP, 10 parts of isothiazolinone, 8 parts of dimethylformamide, 10 parts of sodium dodecylbenzenesulfonate and 220 parts of water.

[0042] A method for preparing a slime stripping agent comprises the following steps:

[0043] Polyoxyethylene alkyl alcohol amide and water are placed in a reactor and mixed and stirred evenly; then dichlorophenol solution, dodecyldimethylcarbamylammonium bromide, HEDP and isothiazolinone are added to the reactor and mixed and stirred evenly; finally, dimethylformamide and sodium dodecylbenzenesulfonate are added to the reactor and mixed and stirred evenly to obtain a slime stripping agent.

[0044] Example 2

[0045] A slime stripping agent is composed of the following raw material components, measured by weight: 14 parts of polyoxyethylene alkylolamide, 12 parts of dichlorophen solution, 20 parts of dodecyldimethylcarbamylammonium bromide, 15 parts of HEDP, 15 parts of isothiazolinone, 12 parts of dimethylformamide, 14 parts of sodium dodecylbenzenesulfonate and 260 parts of water.

[0046] A method for preparing a slime stripping agent comprises the following steps:

[0047] Polyoxyethylene alkyl alcohol amide and water are placed in a reactor and mixed and stirred evenly; then dichlorophenol solution, dodecyldimethylcarbamylammonium bromide, HEDP and isothiazolinone are added to the reactor and mixed and stirred evenly; finally, dimethylformamide and sodium dodecylbenzenesulfonate are added to the reactor and mixed and stirred evenly to obtain a slime stripping agent.

[0048] Example 3

[0049] A slime stripping agent is composed of the following raw material components, measured by weight: 16 parts of polyoxyethylene alkylolamide, 15 parts of dichlorophen solution, 25 parts of dodecyldimethylbenzylamine bromide, 25 parts of HEDP, 20 parts of isothiazolinone, 16 parts of dimethylformamide, 18 parts of sodium dodecylbenzenesulfonate and 300 parts of water.

[0050] A method for preparing a slime stripping agent comprises the following steps:

[0051] Put polyoxyethylene alkyl alcohol amide and water in a reactor and mix and stir evenly; then put dichlorophenol solution, dodecyldimethylbenzylamine bromide and isothiazolinone into the reactor and mix and stir evenly; finally put dimethylformamide and sodium dodecylbenzenesulfonate into the reactor and mix and stir evenly to obtain a slime stripping agent.

[0052] Comparative Example 1

[0053] The only difference between Comparative Example 1 and Example 2 is that the dodecyldimethylbenzylamine bromide in Example 2 is replaced by an equal amount of dodecyldimethylbenzylamine chloride in Comparative Example 1, and the rest is the same as in Example 2.

[0054] Comparative Example 2

[0055] The difference between Comparative Example 2 and Example 2 is only that, Comparative Example 2 adopts trichlorophenol solution to replace the dichlorophenol solution of Example 2 in equal amounts, and the others are the same as Example 2.

[0056] Comparative Example 3

[0057] The only difference between Comparative Example 3 and Example 2 is that Comparative Example 3 uses an equal amount of benzisothiazolinone to replace the isothiazolinone in Example 2, and the rest is the same as Example 2.

[0058] Comparative Example 4

[0059] The only difference between Comparative Example 4 and Example 2 is that Comparative Example 4 uses an equal amount of fatty acid polyoxyethylene ester to replace the polyoxyethylene alkyl alcohol amide in Example 2, and the rest is the same as Example 2.

[0060] Comparative Example 5

[0061] The only difference between Comparative Example 5 and Example 2 is that PAA is used in an equal amount to replace the HEDP in Example 2 in Comparative Example 5, and the rest is the same as in Example 2.

[0062] Comparative Example 6

[0063] The only difference between Comparative Example 6 and Example 2 is that Comparative Example 6 uses an equal amount of triethanolamine to replace the dimethylformamide in Example 2, and the rest is the same as Example 2.

[0064] Comparative Example 7

[0065] The only difference between Comparative Example 7 and Example 2 is that Comparative Example 7 uses an equal amount of sodium hexadecylsulfonate to replace the sodium dodecylbenzenesulfonate in Example 2, and the rest is the same as Example 2.

[0066] Performance Testing

[0067] The slime stripping agents prepared in Examples 1-3 and Comparative Examples 1-7 were tested for slime stripping rate, heterotrophic bacteria killing rate, and sulfate-reducing bacteria killing rate. The test methods are as follows:

[0068] (1) Add bacteria and nutrients to the culture tank to culture the bacteria and algae. Cultivate until the culture solution is slightly turbid. Connect a stainless steel test tube with a length of 250 mm and an inner diameter of 10-15 mm. Dynamically circulate until the stainless steel test tube grows slime to the specified requirements. Remove the stainless steel test tube, dry it at 40°C for 2 hours, and weigh it.

[0069] (2) The weighed stainless steel test tube was reinserted into the test box, and 50 mg / L of the slime stripping agent prepared in Examples 1-3 and Comparative Examples 1-7 were added respectively, and the test tube was run for 24 hours. Then, the stainless steel test tube was taken out, dried at 40°C for 2 hours, and weighed. The overall dynamic control parameters were: pH = 8.0-8.5, temperature 32±1°C, flow rate 1.0 m / h. Before adding the agent and after 24 hours of operation, the culture medium was taken to determine the sterilization rate of heterotrophic bacteria and sulfate-reducing bacteria.

[0070] The calculation formula for the slime stripping rate of slime stripping agent is:

[0071] Sludge stripping rate = (G0-G) / (G0-G1)×100%;

[0072] Where: G0 represents the mass of the slime and the stainless steel test tube before stripping, in g; G represents the mass of the slime and the stainless steel test tube after stripping, in g; G1 represents the initial mass of the stainless steel test tube, in g.

[0073] The bactericidal performance evaluation refers to the standards "Determination of slime-forming bacteria in industrial circulating cooling water - Plate count method" (GB / T14643.1) and "Bactericide performance evaluation method" (SY / T5890).

[0074] The slime stripping rates, heterotrophic bacteria killing rates, and sulfate-reducing bacteria killing rates of the slime strippers of Examples 1-3 and Comparative Examples 1-7 of the present invention are shown in Table 1.

[0075] Table 1: Test results of slime stripping rate, heterotrophic bacteria killing rate and sulfate-reducing bacteria killing rate of slime strippers of Examples 1-3 and Comparative Examples 1-7 of the present invention

[0076] Group Sludge stripping rate / % Heterotrophic bacteria killing rate / % Sulfate-reducing bacteria killing rate / % Example 1 95.33 98.52 98.67 Example 2 97.87 99.87 99.85 Example 3 98.02 99.78 99.90 Comparative Example 1 91.52 92.11 91.98 Comparative Example 2 91.42 90.45 91.67 Comparative Example 3 89.63 90.02 91.07 Comparative Example 4 92.06 93.75 92.19 Comparative Example 5 90.05 91.56 90.38 Comparative Example 6 92.64 92.88 92.39 Comparative Example 7 91.24 92.24 92.75

[0077] As can be seen from Table 1, the slime stripping agent of the present invention has a good slime stripping rate, can quickly penetrate and disintegrate slime, dirt, and biofilm attached to the surface of equipment, restore the cleanliness and operating efficiency of the equipment, and effectively avoid equipment blockage and performance degradation caused by slime accumulation. It also has a good sterilization rate for heterotrophic bacteria and sulfate-reducing bacteria.

[0078] The slime stripping rates, heterotrophic bacteria killing rates and sulfate-reducing bacteria killing rates of the slime strippers of Comparative Examples 1-7 were all lower than those of Example 2, indicating that the slime strippers obtained from the specific types of raw materials of the present invention have better effects in treating slime.

[0079] In summary, the present invention, through the combined action of specific types of components, makes the slime stripping agent have excellent stripping ability. It can quickly penetrate and disintegrate slime, dirt and biofilm attached to the surface of equipment, restore the cleanliness and operating efficiency of the equipment, and effectively avoid equipment blockage and performance degradation caused by slime accumulation. At the same time, it has a strong killing effect on sulfate-reducing bacteria and nitrifying bacteria.

[0080] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A slime stripping agent, characterized in that: These include dodecyldimethylbenzylamine bromide, dichlorophen, isothiazolinone, polyoxyethylene alkylolamide, hydroxyethylene diphosphonic acid, dimethylformamide, and sodium dodecylbenzenesulfonate.

2. The slime remover according to claim 1, characterized in that The slime stripping agent comprises, by weight, 10-30 parts of dodecyldimethylbenzylamine bromide, 5-20 parts of dichlorophen, 5-25 parts of isothiazolinone, 8-20 parts of polyoxyethylene alkylolamide, 5-25 parts of hydroxyethylene diphosphonic acid, 5-20 parts of dimethylformamide and 8-20 parts of sodium dodecylbenzenesulfonate.

3. The slime remover according to claim 2, characterized in that The slime stripping agent further includes a solvent.

4. The slime remover according to claim 3, characterized in that The slime stripping agent comprises, by weight, 10-30 parts of dodecyldimethylbenzylamine bromide, 5-20 parts of dichlorophen, 5-25 parts of isothiazolinone, 8-20 parts of polyoxyethylene alkylolamide, 5-25 parts of hydroxyethylene diphosphonic acid, 5-20 parts of dimethylformamide, 8-20 parts of sodium dodecylbenzenesulfonate and 200-320 parts of solvent.

5. The slime remover according to claim 4, characterized in that The dichlorophen is a dichlorophen solution; and / or the solvent comprises water.

6. The slime remover according to claim 5, characterized in that The mass concentration of the dichlorophen solution is less than 70%.

7. The slime remover according to claim 5, characterized in that The solvent of the dichlorophen solution includes ethanol.

8. The method for preparing the slime stripping agent according to any one of claims 1 to 7, characterized in that: The following steps are involved: The raw material components of the slime stripping agent are mixed to prepare the slime stripping agent.

9. The preparation method according to claim 8, characterized in that The pH after mixing is 6.5-8.

0.

10. Use of the slime stripping agent according to any one of claims 1 to 7 in slime treatment.