Antibacterial coating material for inner wall of pipeline

Abstract

The present invention discloses an antibacterial coating material for the inner wall of a pipeline. The antibacterial coating material comprises the following substances: bisphenol A epoxy resin, a composite antibacterial agent, nano-silica, a defoaming agent, a leveling agent, and tetrahydrofuran; wherein the preparation process of the composite antibacterial agent is as follows: glycidyl methacrylate, an antibacterial monomer, β-mercaptoethanol, azobisisobutyronitrile, and tetrahydrofuran are mixed, bubbling nitrogen for 30-40 minutes, then raising the temperature to 60-70°C, reacting for 10-12 hours, cooling to room temperature after the reaction is completed, precipitating the product with excess methanol, and vacuum drying to obtain the composite antibacterial agent. Advantages: The present invention prepares the composite antibacterial agent through a free radical polymerization reaction. The three-dimensional rigid skeleton and antibacterial active groups contained in the composite antibacterial agent effectively ensure the mechanical strength and long-lasting antibacterial properties of the material.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and in particular relates to an antibacterial coating material for the inner wall of a pipeline. Background Art

[0002] In pipeline transportation systems, the inner walls are prone to breeding bacteria, fungi and other microorganisms, forming biofilms that can cause corrosion and blockage. Traditional pipeline antibacterial technologies mainly include adding chemical fungicides, using antibacterial metals (such as silver and copper), or applying antibacterial coatings. However, these methods have obvious drawbacks: chemical fungicides may cause environmental pollution or drug resistance due to continuous release; antibacterial metals are expensive and easily lose their effectiveness due to ion dissolution after long-term use; and existing antibacterial coatings often have difficulty balancing mechanical properties and antibacterial durability. For example, although some coatings have good antibacterial effects, they lack flexibility and are prone to cracking and falling off due to pipeline deformation or fluid erosion. In addition, the antibacterial components in conventional coatings (such as nanosilver) are prone to agglomeration or loss, resulting in a decrease in antibacterial performance over time.

[0003] Therefore, in order to solve the above problems, the present invention provides an antibacterial coating material for the inner wall of a pipeline. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide an antibacterial coating material for the inner wall of a pipeline.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An antibacterial coating material for the inner wall of a pipeline comprises the following substances: by weight, 80-100 parts of bisphenol A epoxy resin, 10-20 parts of a composite antibacterial agent, 3-4 parts of nano-silicon dioxide, 1-2 parts of a defoaming agent, 1-2 parts of a leveling agent, and 100-120 parts of tetrahydrofuran;

[0007] Among them, the preparation process of the composite antibacterial agent is: mix glycidyl methacrylate, antibacterial monomer, β-mercaptoethanol, azobisisobutyronitrile, and tetrahydrofuran, bubble nitrogen for 30-40 minutes, then increase the temperature to 60-70°C, react for 10-12 hours, cool to room temperature after the reaction is completed, precipitate the product with excess methanol, and vacuum dry to obtain the composite antibacterial agent.

[0008] In the scheme, glycidyl methacrylate, antibacterial monomer and β-mercaptoethanol are reacted by free radical polymerization under the initiation of azobisisobutyronitrile to prepare a composite antibacterial agent.

[0009] More optimally, the raw materials in the composite antibacterial agent include the following components: by weight, 2-3 parts of glycidyl methacrylate, 15-18 parts of antibacterial monomer, 0.7-0.9 parts of β-mercaptoethanol, 0.1-0.2 parts of azobisisobutyronitrile, and 130-150 parts of tetrahydrofuran.

[0010] More optimally, the preparation process of the antibacterial monomer is:

[0011] S1: Mix guaiacol, anhydrous ethanol, concentrated sulfuric acid, hydroxymethyl acrylamide, and anhydrous magnesium sulfate, stir evenly, and react in a 35°C water bath for 24 hours. After the reaction, filter, wash, and recrystallize to obtain intermediate A;

[0012] S2: Intermediate A, furfurylamine, paraformaldehyde, and anhydrous ethanol are mixed, the temperature is raised to 90-100°C, and the mixture is refluxed for 4-5 hours. The solution is then evaporated using a rotary evaporator to remove the ethanol, and the mixture is washed and dried to obtain intermediate B.

[0013] S3: 11-bromo-1-undecanol, 1-adamantanecarboxylic acid, p-toluenesulfonic acid, and cyclohexane were mixed, the temperature was raised to 80-90°C, and the mixture was refluxed for 10-12 hours. After the reaction was completed, the mixture was concentrated, and the crude product was dissolved in ethyl acetate, washed, dried, and purified to obtain Intermediate C;

[0014] S4: adding intermediate C and intermediate B to acetonitrile, raising the temperature to 60-70°C, stirring and reacting for 3-4 hours. After the reaction is completed, cooling to room temperature, post-processing, and obtaining an antibacterial monomer.

[0015] In the scheme, hydroxymethyl acrylamide dehydrates under acidic conditions to form a carbon cation, which acts as an electrophilic reagent to attack the aromatic ring of guaiacol, thereby obtaining intermediate A. The specific synthesis process is shown below:

[0016] ;

[0017] More optimally, the raw materials in the intermediate A include the following components: by weight, 12-15 parts of guaiacol, 60-70 parts of anhydrous ethanol, 0.4-0.5 parts of concentrated sulfuric acid, 10-12 parts of hydroxymethyl acrylamide, and 1-2 parts of anhydrous magnesium sulfate.

[0018] In the scheme, the formaldehyde decomposed from paraformaldehyde undergoes a nucleophilic addition reaction with furfural amine, followed by dehydration to form an iminium ion. The carbon atom of intermediate A with active hydrogen then acts as a nucleophile to attack the carbon atom of the iminium ion to obtain intermediate B. The specific synthesis process is as follows:

[0019] ;

[0020] More optimally, the raw materials in the intermediate B include the following components: by weight, 12-15 parts of intermediate A, 9-10 parts of furfurylamine, 3-4 parts of paraformaldehyde, and 50-60 parts of anhydrous ethanol.

[0021] In the scheme, the hydroxyl group of 11-bromo-1-undecanol undergoes esterification with 1-adamantanecarboxylic acid in the presence of p-toluenesulfonic acid (acid catalyst) to obtain intermediate C. The specific synthesis process is shown below:

[0022] ;

[0023] More optimally, the raw materials in the intermediate C include the following components: 25-28 parts by weight of 11-bromo-1-undecanol, 18-20 parts of 1-adamantanecarboxylic acid, 1-2 parts of p-toluenesulfonic acid, and 15-18 parts of cyclohexane.

[0024] In the scheme, the nucleophilic site of intermediate B attacks the partially positively charged carbon atom in intermediate C, thereby obtaining an antibacterial monomer, the structure of which is shown below:

[0025] ;

[0026] More optimally, the raw materials in the antibacterial monomer include the following components: 25-28 parts of intermediate C, 12-15 parts of intermediate B, and 40-50 parts of acetonitrile, by weight.

[0027] More optimally, the defoaming agent includes one or more of silicone defoaming agents, polyether defoaming agents, and fatty acid ester defoaming agents; the leveling agent includes one or more of acrylic leveling agents and silicone leveling agents.

[0028] Beneficial effects of the present invention:

[0029] The present invention prepares a composite antimicrobial agent through free radical polymerization. The composite antimicrobial agent contains a three-dimensional rigid skeleton and antimicrobial active groups, which effectively ensure the mechanical strength and long-lasting antimicrobial properties of the material. The details are as follows:

[0030] First: In the scheme, the three-dimensional rigid skeleton of the adamantane carboxylic acid derivative contained in the composite antimicrobial agent effectively reduces bacterial adhesion and colonization through steric hindrance and molecular recognition interference, thereby reducing the consumption pressure of the antimicrobial agent; in addition, its rigid structure limits the rotational freedom of the polymer, which can reduce the erosion of the chain segments by enzymes or acids secreted by bacteria; at the same time, the quaternized ammonium benzoxazine group contained in the composite antimicrobial agent can provide long-lasting contact bactericidal ability, eliminating residual microorganisms that have broken through the stereochemical barrier, forming a double protection.

[0031] Second: In the scheme, the cross-linked network of the epoxy resin in the obtained coating constructs a rigid skeleton, ensuring that the coating has sufficient strength and hardness, while the epoxy groups of the composite antibacterial agent participate in the curing process and give the material excellent ductility through flexible chain segments, which significantly improves the elongation at break; therefore, through the synergistic effect of "rigid skeleton + flexible energy-consuming unit", the coating can maintain sufficient strength while gaining excellent flexibility, meeting the mechanical performance requirements under complex working conditions. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] Example 1: An antibacterial coating material for the inner wall of a pipeline comprises the following substances: by weight, 80 parts of bisphenol A epoxy resin, 10 parts of a composite antibacterial agent, 3 parts of nano-silicon dioxide, 1 part of a defoaming agent (BYK-071), 1 part of a leveling agent (BYK-345), and 100 parts of tetrahydrofuran;

[0034] The preparation process of the composite antibacterial agent is as follows: 2 parts of glycidyl methacrylate, 15 parts of antibacterial monomer, 0.7 parts of β-mercaptoethanol, 0.1 parts of azobisisobutyronitrile, and 130 parts of tetrahydrofuran are mixed, nitrogen is bubbled for 30 minutes, then the temperature is raised to 60°C, the reaction is carried out for 10 hours, and after the reaction is completed, the reaction is cooled to room temperature, the product is precipitated with excess methanol, and vacuum dried to obtain the composite antibacterial agent;

[0035] Among them, the preparation process of the antibacterial monomer is:

[0036] S1: 12 parts of guaiacol, 60 parts of anhydrous ethanol, 0.4 parts of concentrated sulfuric acid, 10 parts of hydroxymethyl acrylamide, and 1 part of anhydrous magnesium sulfate were mixed, stirred evenly, and reacted in a 35°C water bath for 24 hours. After the reaction, the mixture was filtered, washed, and recrystallized to obtain intermediate A;

[0037] S2: 12 parts of intermediate A, 9 parts of furfurylamine, 3 parts of paraformaldehyde, and 50 parts of anhydrous ethanol were mixed, the temperature was raised to 90°C, and the mixture was refluxed for 4 hours. The solution was then evaporated using a rotary evaporator to remove the ethanol, washed, and dried to obtain intermediate B;

[0038] S3: 25 parts of 11-bromo-1-undecanol, 18 parts of 1-adamantanecarboxylic acid, 1 part of p-toluenesulfonic acid, and 15 parts of cyclohexane were mixed, the temperature was raised to 80°C, and the mixture was refluxed for 10 hours. After the reaction was completed, the mixture was concentrated, and the crude product was dissolved in ethyl acetate, washed, dried, and purified to obtain Intermediate C;

[0039] S4: 25 parts of intermediate C and 12 parts of intermediate B were added to 40 parts of acetonitrile, the temperature was raised to 60°C, and the mixture was stirred for reaction for 3 hours. After the reaction was completed, the mixture was cooled to room temperature and post-processed to obtain an antibacterial monomer.

[0040] Example 2: An antibacterial coating material for the inner wall of a pipeline comprises the following substances: by weight: 100 parts of bisphenol A epoxy resin, 20 parts of a composite antibacterial agent, 4 parts of nano-silicon dioxide, 2 parts of a defoaming agent (BYK-071), 2 parts of a leveling agent (BYK-345), and 120 parts of tetrahydrofuran;

[0041] The preparation process of the composite antibacterial agent is as follows: 3 parts of glycidyl methacrylate, 18 parts of antibacterial monomer, 0.9 parts of β-mercaptoethanol, 0.2 parts of azobisisobutyronitrile, and 150 parts of tetrahydrofuran are mixed, nitrogen is bubbled for 40 minutes, then the temperature is raised to 70°C, the reaction is carried out for 12 hours, and after the reaction is completed, the reaction is cooled to room temperature, the product is precipitated with excess methanol, and vacuum dried to obtain the composite antibacterial agent;

[0042] Among them, the preparation process of the antibacterial monomer is:

[0043] S1: 15 parts of guaiacol, 70 parts of anhydrous ethanol, 0.5 parts of concentrated sulfuric acid, 12 parts of hydroxymethyl acrylamide, and 2 parts of anhydrous magnesium sulfate were mixed, stirred evenly, and reacted in a 35°C water bath for 24 hours. After the reaction, the mixture was filtered, washed, and recrystallized to obtain intermediate A;

[0044] S2: 15 parts of intermediate A, 10 parts of furfurylamine, 4 parts of paraformaldehyde, and 60 parts of anhydrous ethanol were mixed, the temperature was raised to 100°C, and the mixture was refluxed for 5 hours. The solution was then evaporated using a rotary evaporator to remove the ethanol, and the mixture was washed and dried to obtain intermediate B;

[0045] S3: 28 parts of 11-bromo-1-undecanol, 20 parts of 1-adamantanecarboxylic acid, 2 parts of p-toluenesulfonic acid, and 18 parts of cyclohexane were mixed, the temperature was raised to 90°C, and the mixture was refluxed for 12 hours. After the reaction was completed, the mixture was concentrated, and the crude product was dissolved in ethyl acetate, washed, dried, and purified to obtain Intermediate C;

[0046] S4: 28 parts of intermediate C and 15 parts of intermediate B were added to 50 parts of acetonitrile, the temperature was raised to 70°C, and the mixture was stirred for reaction for 4 hours. After the reaction was completed, the mixture was cooled to room temperature and post-processed to obtain an antibacterial monomer.

[0047] Example 3: An antibacterial coating material for the inner wall of a pipeline comprises the following substances: by weight, 90 parts of bisphenol A epoxy resin, 15 parts of a composite antibacterial agent, 3.5 parts of nano-silicon dioxide, 1.5 parts of a defoaming agent (BYK-071), 1.5 parts of a leveling agent (BYK-345), and 110 parts of tetrahydrofuran;

[0048] The preparation process of the composite antibacterial agent is as follows: 2.5 parts of glycidyl methacrylate, 16.5 parts of antibacterial monomer, 0.8 parts of β-mercaptoethanol, 0.15 parts of azobisisobutyronitrile, and 140 parts of tetrahydrofuran are mixed, nitrogen is bubbled for 35 minutes, then the temperature is raised to 65°C, the reaction is carried out for 11 hours, and after the reaction is completed, the reaction is cooled to room temperature, the product is precipitated with excess methanol, and vacuum dried to obtain the composite antibacterial agent;

[0049] Among them, the preparation process of the antibacterial monomer is:

[0050] S1: 13.5 parts of guaiacol, 65 parts of anhydrous ethanol, 0.45 parts of concentrated sulfuric acid, 11 parts of hydroxymethyl acrylamide, and 1.5 parts of anhydrous magnesium sulfate were mixed, stirred evenly, and reacted in a 35°C water bath for 24 hours. After the reaction, the mixture was filtered, washed, and recrystallized to obtain intermediate A;

[0051] S2: 13.5 parts of intermediate A, 9.5 parts of furfurylamine, 3.5 parts of paraformaldehyde, and 55 parts of anhydrous ethanol were mixed, the temperature was raised to 95°C, and the mixture was refluxed for 4.5 hours. The solution was then evaporated using a rotary evaporator to remove ethanol, washed, and dried to obtain intermediate B;

[0052] S3: 26.5 parts of 11-bromo-1-undecanol, 19 parts of 1-adamantanecarboxylic acid, 1.5 parts of p-toluenesulfonic acid, and 16.5 parts of cyclohexane were mixed, the temperature was raised to 85°C, and the mixture was refluxed for 11 hours. After the reaction was completed, the mixture was concentrated, and the crude product was dissolved in ethyl acetate, washed, dried, and purified to obtain Intermediate C;

[0053] S4: 26.5 parts of intermediate C and 13.5 parts of intermediate B were added to 45 parts of acetonitrile, the temperature was raised to 65°C, and the mixture was stirred for reaction for 3.5 hours. After the reaction was completed, the mixture was cooled to room temperature and post-treated to obtain an antibacterial monomer.

[0054] Comparative Example 1: Nanosilver was used to replace the composite antibacterial agent, as follows:

[0055] An antibacterial coating material for the inner wall of a pipeline comprises the following substances: by weight, 90 parts of bisphenol A epoxy resin, 5-6 parts of nano silver particles, 3.5 parts of nano silicon dioxide, 1.5 parts of a defoaming agent (BYK-071), 1.5 parts of a leveling agent (BYK-345), and 110 parts of tetrahydrofuran.

[0056] Comparative Example 2: In the preparation process of the composite antibacterial agent, the stereostructured adamantane is not introduced, as follows:

[0057] An antibacterial coating material for the inner wall of a pipeline comprises the following substances: by weight, 90 parts of bisphenol A epoxy resin, 15 parts of a composite antibacterial agent, 3.5 parts of nano-silicon dioxide, 1.5 parts of a defoaming agent (BYK-071), 1.5 parts of a leveling agent (BYK-345), and 110 parts of tetrahydrofuran;

[0058] The preparation process of the composite antibacterial agent is as follows: 2.5 parts of glycidyl methacrylate, 16.5 parts of antibacterial monomer, 0.8 parts of β-mercaptoethanol, 0.15 parts of azobisisobutyronitrile, and 140 parts of tetrahydrofuran are mixed, nitrogen is bubbled for 35 minutes, then the temperature is raised to 65°C, the reaction is carried out for 11 hours, and after the reaction is completed, the reaction is cooled to room temperature, the product is precipitated with excess methanol, and vacuum dried to obtain the composite antibacterial agent;

[0059] Among them, the preparation process of the antibacterial monomer is:

[0060] S1: 13.5 parts of guaiacol, 65 parts of anhydrous ethanol, 0.45 parts of concentrated sulfuric acid, 11 parts of hydroxymethyl acrylamide, and 1.5 parts of anhydrous magnesium sulfate were mixed, stirred evenly, and reacted in a 35°C water bath for 24 hours. After the reaction, the mixture was filtered, washed, and recrystallized to obtain intermediate A;

[0061] S2: 13.5 parts of intermediate A, 9.5 parts of furfurylamine, 3.5 parts of paraformaldehyde, and 55 parts of anhydrous ethanol were mixed, the temperature was raised to 95°C, and the mixture was refluxed for 4.5 hours. The solution was then evaporated using a rotary evaporator to remove ethanol, washed, and dried to obtain an antibacterial monomer.

[0062] Detection test:

[0063] Curing agent D400 was added to the coating materials obtained in the examples and comparative examples, stirred evenly, and then drop-coated on the pretreated substrate. The coating materials were pre-cured at room temperature for 6 hours, and then cured in an oven at 60°C for 10 hours. The following tests were then performed:

[0064] (1) According to ASTM D638, the coatings obtained in the examples and comparative examples were peeled off from the substrates to prepare dumbbell-shaped specimens (size: 50 mm × 4 mm × 3 mm). The specimens were tested using a CMT4204 universal testing machine at room temperature at a tensile rate of 50 mm / min to obtain the elongation at break and tensile strength.

[0065] (2) The coatings obtained in the examples and comparative examples were immersed in PBS buffer for 24 hours and sterilized with UV for 30 minutes. The samples were then placed in culture dishes, and the bacterial solution was added. The samples were cultured at 37°C for 24 hours. The number of colonies attached to the sample surface and the number of colonies in the blank control group were determined by plate counting method, and the antibacterial rate was calculated (the strains tested were Pseudomonas aeruginosa and Staphylococcus aureus).

[0066] The obtained data is shown in the following table:

[0067] ;

[0068] Table 1

[0069] Conclusion: The present invention provides an antibacterial coating material for pipeline inner walls. The composite antibacterial agent, prepared by free radical polymerization, combines a three-dimensional rigid skeleton with antibacterial active groups, significantly improving the coating's mechanical strength and long-lasting antibacterial properties. Experimental data show that the coatings in the examples exhibited superior elongation at break (132%-136%) and antibacterial rates (98.67%-99.01% against Pseudomonas aeruginosa and 99.07%-99.15% against Staphylococcus aureus) compared to the comparative examples (e.g., the nanosilver coating exhibited a low antibacterial rate, with an elongation at break of only 86%). This demonstrates that the material maintains high tensile strength while possessing excellent flexibility and highly effective antibacterial properties, making it suitable for protecting pipeline inner walls under complex operating conditions.

[0070] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0071] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. An antibacterial coating material for the inner wall of a pipeline, characterized by: The antibacterial coating material comprises the following substances: by weight, 80-100 parts of bisphenol A epoxy resin, 10-20 parts of composite antibacterial agent, 3-4 parts of nano-silicon dioxide, 1-2 parts of defoaming agent, 1-2 parts of leveling agent, and 100-120 parts of tetrahydrofuran; The composite antibacterial agent is prepared by the following process: glycidyl methacrylate, antibacterial monomer, β-mercaptoethanol, azobisisobutyronitrile, and tetrahydrofuran are mixed, nitrogen is bubbled for 30-40 minutes, the temperature is then raised to 60-70°C, the reaction is carried out for 10-12 hours, and after the reaction is completed, the product is cooled to room temperature, and the product is precipitated with excess methanol and vacuum dried to obtain the composite antibacterial agent; Among them, the antibacterial monomer is prepared by the following process: S1: Mix guaiacol, anhydrous ethanol, concentrated sulfuric acid, hydroxymethyl acrylamide, and anhydrous magnesium sulfate, stir evenly, and react in a 35°C water bath for 24 hours. After the reaction, filter, wash, and recrystallize to obtain intermediate A; S2: Intermediate A, furfurylamine, paraformaldehyde, and anhydrous ethanol are mixed, the temperature is raised to 90-100°C, and the mixture is refluxed for 4-5 hours. The solution is then evaporated using a rotary evaporator to remove the ethanol, and the mixture is washed and dried to obtain intermediate B. S3: 11-bromo-1-undecanol, 1-adamantanecarboxylic acid, p-toluenesulfonic acid, and cyclohexane were mixed, the temperature was raised to 80-90°C, and the mixture was refluxed for 10-12 hours. After the reaction was completed, the mixture was concentrated, and the crude product was dissolved in ethyl acetate, washed, dried, and purified to obtain Intermediate C; S4: adding intermediate C and intermediate B to acetonitrile, raising the temperature to 60-70°C, stirring and reacting for 3-4 hours. After the reaction is completed, cooling to room temperature, post-processing, and obtaining an antibacterial monomer.

2. The antibacterial coating material for the inner wall of a pipeline according to claim 1, characterized in that: The raw materials of the composite antibacterial agent include the following components: by weight, 2-3 parts of glycidyl methacrylate, 15-18 parts of antibacterial monomer, 0.7-0.9 parts of beta-mercaptoethanol, 0.1-0.2 parts of azobisisobutyronitrile, and 130-150 parts of tetrahydrofuran.

3. The antibacterial coating material for the inner wall of a pipeline according to claim 1, characterized in that: The raw materials in the intermediate A include the following components: 12-15 parts of guaiacol, 60-70 parts of anhydrous ethanol, 0.4-0.5 parts of concentrated sulfuric acid, 10-12 parts of hydroxymethyl acrylamide, and 1-2 parts of anhydrous magnesium sulfate, calculated by weight.

4. The antibacterial coating material for the inner wall of a pipeline according to claim 1, characterized in that: The raw materials in the intermediate B include the following components: by weight, 12-15 parts of intermediate A, 9-10 parts of furfurylamine, 3-4 parts of paraformaldehyde, and 50-60 parts of anhydrous ethanol.

5. The antibacterial coating material for the inner wall of a pipeline according to claim 1, characterized in that: The raw materials in the intermediate C include the following components: 25-28 parts by weight of 11-bromo-1-undecanol, 18-20 parts of 1-adamantanecarboxylic acid, 1-2 parts of p-toluenesulfonic acid, and 15-18 parts of cyclohexane.

6. The antibacterial coating material for the inner wall of a pipeline according to claim 1, characterized in that: The raw materials of the antibacterial monomer include the following components: 25-28 parts of intermediate C, 12-15 parts of intermediate B, and 40-50 parts of acetonitrile in parts by weight.

7. The antibacterial coating material for the inner wall of a pipeline according to claim 1, characterized in that: The defoaming agent includes one or more of an organosilicon defoaming agent, a polyether defoaming agent, and a fatty acid ester defoaming agent; the leveling agent includes one or more of an acrylate leveling agent and an organosilicon leveling agent.