Antibacterial resin system and manufacturing method of antibacterial inner surface of separation membrane

Abstract

The invention discloses an antibacterial resin system and a manufacturing method of an antibacterial inner surface of a separation membrane, and belongs to the field of separation membranes. The invention aims to solve the problems that the separation efficiency of the separation membrane is sharply reduced, the cleaning times are increased and the operation cost is increased. The preparation method comprises the following steps: mixing bisphenol epoxy resin, an antibacterial agent, a wetting agent and an amine compound, and uniformly stirring to obtain an oxygen resin mixture; mixing anhydride, a flexibilizer and a quaternary ammonium salt compound, and uniformly stirring to obtain an anhydride mixture; and pouring the epoxy resin mixture into the anhydride mixture, mixing and stirring, adding the thickening agent, and defoaming to obtain the antibacterial resin system. According to the functional pipeline capable of inhibiting bacterial reproduction and preventing the inner wall from generating a mycoderm, the biological pollution of a membrane shell can be reduced, the sewage blockage and cleaning times of the system can be reduced, the use of a degerming agent in the treatment process can be reduced, the water production cost is reduced, the water quality is improved, the healthy and environment-friendly social development trend is met, and the future development potential is huge; the method has prominent economic benefits and social benefits.

Description

Technical Field

[0001] The present invention belongs to the field of separation membranes, and in particular relates to a method for preparing an antibacterial resin system and a method for preparing an antibacterial inner surface. Background Art

[0002] As a new technology concept, the development of the antimicrobial industry is positively correlated with the level of economic development. With the rapid development of China's economy, it has gradually become a focus of attention. In recent years, with the continued popularization of antimicrobial knowledge and the promotion of antimicrobial concepts, more and more industries have begun to accept antimicrobial concepts and launch antimicrobial products, and the antimicrobial industry has shown rapid development.

[0003] Membrane fouling in reverse osmosis water treatment mainly includes precipitation fouling, adsorption fouling and biological fouling. Inhibiting biological fouling is the key to controlling membrane fouling. The hydrophobic surface easily undergoes hydrophobic interactions and van der Waals forces with microorganisms in the water, causing them to adsorb and deposit on the membrane surface or in the membrane pores, causing the membrane pore size to become smaller or blocked, forming membrane fouling. The membrane separation efficiency will drop sharply, the number of cleanings will increase, and the operating costs will increase. At this stage, membrane materials are based on the clarification of the interfacial adhesion behavior of pollutants and the interaction mechanism between membrane surface functional groups and pollutants, and are based on the preparation of anti-fouling membrane materials for colloidal and dissolved pollutants based on functional material blending / grafting modification. At the same time, antimicrobial agents are loaded on the membrane surface or in the membrane matrix to inhibit the growth of microorganisms on the membrane surface through the release of antimicrobial agents or direct contact. Summary of the Invention

[0004] The present invention provides an antimicrobial resin system and a method for producing an antimicrobial inner surface of a separation membrane. This invention develops an antimicrobial resin system and produces an antimicrobial inner surface of the separation membrane housing, which inhibits bacterial growth and prevents the formation of biofilm on the inner wall of a functional pipeline. This reduces biological contamination of the membrane housing, minimizes system clogging and cleaning frequency, and reduces the use of sterilizing agents during the treatment process, lowering water production costs and improving water quality. This approach aligns with the social trend toward health and environmental protection, and has significant potential for future development, with outstanding economic and social benefits.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: The object of the present invention is to provide a method for preparing an antibacterial resin system, comprising the following steps: Step 1, mixing a bisphenol epoxy resin, an antibacterial agent, a wetting agent and an amine compound, and stirring them uniformly to obtain an epoxy resin mixture; Step 2: mixing the acid anhydride, toughening agent and quaternary ammonium salt compound, stirring evenly to obtain an acid anhydride mixture; Step 3: Pour the epoxy resin mixture into the acid anhydride mixture, mix and stir, add a thickener, and defoam to obtain an antibacterial resin system.

[0006] It is further defined that the mass ratio of the bisphenol epoxy resin, the acid anhydride, the quaternary ammonium salt compound, the amine compound and the antibacterial agent is (9-11): (6-9): (0.1-0.35): (0.03-0.2): (0.005-0.05). It is further defined that the amount of wetting agent added is 1% to 3% of the mass of the bisphenol epoxy resin; It is further defined that the amount of toughening agent added is 5% to 15% of the mass of the bisphenol epoxy resin; It is further defined that the amount of thickener added is 0.5% to 5% of the mass of the bisphenol epoxy resin.

[0007] It is further defined that the bisphenol epoxy resin is bisphenol A epoxy resin, bisphenol F epoxy resin, hydrogenated bisphenol A epoxy resin or hydrogenated bisphenol F epoxy resin, which is the main matrix compound.

[0008] It is further defined that the antibacterial agent is mercaptobenzothiazole or its derivatives, and the derivatives are 2-mercaptobenzothiazole, imidazole [2,1-b] benzothiazole compounds, 2-mercaptobenzothiazole-2-methoxy or mercaptobenzothiazole sodium, which have inhibitory effects on some bacteria and fungi, such as Gram-positive bacteria (such as Staphylococcus aureus) and some fungi (such as Candida albicans). Its thiol (-SH) exerts its effect by interfering with the function of cell membranes, causing cell membrane rupture and protein coagulation and precipitation, and ultimately leading to the death of microorganisms; by interfering with the enzyme system of microorganisms, blocking their growth and reproduction, thereby achieving a bactericidal effect.

[0009] It is further defined that the wetting agent is a polymer of alkyl glycidyl ether, and the wetting agent in the formula mainly improves the wetting of the resin system and the fiber surface, and plays a role in yarn spreading and wetting. During the winding process, the glass fiber dry yarn quickly passes through the resin system under a certain speed and tension, and the resin system needs to impregnate the fiber in a short time. On the one hand, after the wetting agent is added, it forms a stable chemical bond between the fiber and the resin system interface, which is beneficial to enhance the interfacial bonding force, improve the interlayer strength of the fiber reinforced plastic interface and the rigidity of the separation membrane shell; on the other hand, it reduces the surface tension of the fiber in the high-viscosity resin, which is beneficial for the resin system to pass through the internal gaps of the fiber bundle, so that the resin system and the fiber bundle form a more compact structure.

[0010] It is further defined that the amine compound is triethanolamine, tris(2-hydroxypropyl)amine, tris(2-hydroxyethyl)methylamine or tris(2-hydroxyethyl)aminopropylamine) as a catalyst.

[0011] Amine compounds are used as anionic catalysts in the formula to catalyze the anionic ring-opening reaction of the epoxy groups in the epoxy resin molecular structure and the ring-opening reaction of the anhydride groups in the phthalic anhydride molecular structure, catalyze the copolymerization addition reaction of the epoxy resin and the anhydride curing agent to form a polyester three-dimensional cross-linked network structure, and cooperate with the cationic catalyst quaternary ammonium salt compound to catalyze the cationic ring-opening reaction of the epoxy groups in the epoxy resin molecular structure, effectively reducing the curing reaction temperature of the resin system with an epoxy resin / anhydride molar ratio greater than 1.

[0012] It is further defined that the acid anhydride is methyltetrahydrophthalic anhydride, endomethylenetetrahydrophthalic anhydride, methylhexahydrophthalic anhydride or methylendomethylenetetrahydrophthalic anhydride, which is the main matrix compound.

[0013] The toughening agent is further defined as polypropylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, fatty acid polyglycidyl ether, carboxyl liquid nitrile rubber, or polyvinyl butyral. The toughening agent (bifunctional epoxy resin reactive diluent) in the formulation primarily serves to increase the elongation at break of the matrix, enhance the toughness of the separation membrane shell, and reduce cracks, cracking, or loosening caused by stress or external forces. The toughening agent used in the present invention is added in an amount of 5%-15% of the resin, depending on the product model and process. The elongation at break can be increased by approximately 15%-20%, significantly improving the product's impact resistance without compromising the overall heat resistance of the formulation.

[0014] It is further defined that the quaternary ammonium salt compound is dimethyldiallyl ammonium chloride (DADMAC), acryloyloxyethyltrimethylammonium chloride (DAC), methacryloyloxyethyltrimethylammonium chloride (DMC) or methacrylamidopropyltrimethylammonium chloride (MAPTAC), which serves as a catalyst and a synergistic antibacterial agent.

[0015] Quaternary ammonium salts and sulfur-containing compounds work together to kill bacteria by destroying the bacterial cell membrane and DNA. Quaternary ammonium salts use their electric charge to adsorb on the surface of microorganisms, destroy the membrane structure, inhibit the activity of proteins, and ultimately lead to the death of microorganisms.

[0016] It is further defined that the thickener is fumed silica (white carbon black); as a thickener, fumed silica has the characteristics of high specific surface area, high porosity and high adsorption capacity, and forms a unique three-dimensional network structure in the resin system. During the production process of the lining layer, the resin is retained on the surface felt to a great extent, forming a resin-rich inner surface; on the other hand, due to the dimensional stability of fumed silica, the movement of the polymer molecular chains in the resin system is restricted, making the dispersion system stable; furthermore, due to the small size effect of fumed silica, the lining is smoother and the friction coefficient is reduced. The high strength of the nanoparticles greatly enhances the wear resistance of the material.

[0017] Another object of the present invention is to provide a method for preparing an antibacterial inner surface of a separation membrane, which is carried out according to the following steps: the fiber felt is impregnated with the antibacterial resin system described in any one of the above items, and then the fiber felt is impregnated and controlled. It is then wound into a hollow column on a mold at a temperature of 50°C-90°C, transferred to a drying oven, heated to 70°C-90°C, maintained at a constant temperature for 2h-3h, then heated to 110°C-150°C, maintained at a constant temperature for 4h-6h, cooled and demolded to obtain the antibacterial inner surface of the separation membrane shell.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The antibacterial resin system casting of the present invention has obvious antibacterial properties against Escherichia coli; the separation membrane shell sample has obvious antibacterial effects on four bacteria: Clostridium perfringens, Citrobacter rodentium, Klebsiella and thermotolerant coliform bacteria; after being immersed at 65°C for 30 hours, it has obvious antibacterial properties against the above-mentioned Acidobacterium cloacae and Enterococcus faecalis.

[0019] In order to further understand the features and technical contents of the present invention, please refer to the following detailed description of the present invention and the accompanying drawings. However, the accompanying drawings are provided for reference and illustration only and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Escherichia coli was used to test the antifungal properties of epoxy resin casting samples. Figure 2 It has antibacterial properties against Clostridium perfringens; Figure 3 It is the antimicrobial properties of Citrobacter; Figure 4 It is Klebsiella antibacterial property; Figure 5a This is the antibacterial performance of the heat-resistant coliform colony of Comparative Example 2; Figure 5b The antibacterial performance of the heat-resistant coliform colony of Example 2 is as follows; Figure 6 The antibacterial properties of Acidobacterium cloacae and Enterococcus faecalis colonies of the separation membrane shell samples after immersion treatment were tested. DETAILED DESCRIPTION

[0021] (1) Add epoxy resin (9kg~11kg), antibacterial agent (0.005-0.05)kg, wetting agent (0.1kg~0.3kg) and amine compound (0.03kg~0.2kg) into mixing container 1, and stir for 2min~5min at a stirring speed of 50-200r / min; add acid anhydride (6kg~8kg), toughening agent (0.5kg~1.5kg) and quaternary ammonium salt compound (0.1kg~0.35kg) into mixing container 2, and stir for 2min~5min at a stirring speed of 50-200r / min; pour the epoxy resin mixture into the acid anhydride mixture and mix and stir for 2min~5min at a stirring speed of 50-200r / min; add thickener during the process of making the inner lining, stir for 2min~5min, and obtain the glue solution after defoaming treatment; (2) The fiber filaments are immersed in the glue in a tank with a constant temperature (30-40℃) and defoaming function according to a given yarn guide path. The fibers are dipped in glue, controlled in glue and wetted according to the specified winding procedure and yarn guide path. The fibers are wound into a hollow cylindrical initial product on a mold at a temperature of 50-90℃ through a follower device and transferred to a drying oven. The temperature is raised to 70-90℃ according to different size requirements and kept constant for 2-3 hours. The temperature is then raised to 110-150℃ and kept constant for 4-6 hours. The separation membrane shell is cooled and demolded to obtain a semi-finished product, which is then obtained through subsequent processing and coating steps.

[0022] Separation membrane formulation Liner Example Epoxy resin: acid anhydride: quaternary ammonium salt compound (catalyst 1) + amine compound (catalyst 1): mercaptobenzothiazole or its derivatives are (9-11) kg: (6-9) kg: (0.1-0.35) kg: (0.03-0.2) kg: (0.005-0.05) kg The amount of wetting agent added is 1%~3% of the epoxy resin mass; The amount of toughening agent added is 5%~15% of the epoxy resin mass; The amount of thickener added is 0.5%~5% of the mass of epoxy resin.

[0023] Structure layer example Epoxy resin: acid anhydride: quaternary ammonium salt compound (catalyst 1) + amine compound (catalyst 1) is (9-11) kg: (6-9) kg: (0.1-0.35) kg: (0.03-0.2) kg: The amount of wetting agent added is 1%~3% of the epoxy resin mass; The amount of toughening agent added is 5%~15% of the epoxy resin mass; 4.3 Preparation method The recipe is prepared according to the following steps: (1) Add antibacterial agent, wetting agent and amine compound to epoxy resin and stir evenly for at least 3 minutes; (2) Add toughening agent and quaternary ammonium salt compound to acid anhydride and stir evenly for at least 3 minutes; (3) Mixing and stirring the epoxy resin mixture after standing and the acid anhydride mixture for a stirring time of not less than 3 minutes; (4) During the process of making the inner lining layer, a thickener needs to be added to the overall mixed glue solution and stirred evenly for at least 3 minutes; (5) Defoam the prepared glue solution using a dedicated defoaming and degassing device.

[0024] 4.4 Process Technology (1) According to the viscosity range of epoxy resin system, a dedicated defoaming and degassing device and path are established to heat and defoam the circulating glue liquid. The glue liquid temperature is controlled with an accuracy of ±5°C to eliminate or greatly reduce the bubbles generated in the initial mixing stage and in the yarn feeding path; (2) According to the temperature difference of the four seasons, adjust the mold temperature and control the temperature between 50-90℃ (mold temperature control accuracy ±5℃), adjust the amount of thickener used and the lining pre-impregnation time to ensure that the resin content of the resin-rich layer is greater than 90%.

[0025] (3) According to the reaction characteristics of the glue solution, the catalyst and toughening agent should be stored at a constant temperature. A separate constant temperature path should be established during the mixing process. The constant temperature range is 25-35℃. When the ambient temperature is below 20℃, the operation time should not exceed 3 minutes.

[0026] (4) Design a dedicated constant temperature glue tank, with a circulating glue solution at a constant temperature range of 40℃-50℃. The glue solution passing through the yarn guide path is circulated externally for heating and defoaming, and then returns to the constant temperature glue tank to achieve constant temperature control and defoaming of the glue solution, ensuring that the formula reacts fully and the fiber is effectively wetted.

[0027] 4.5 Solidification system Raise the temperature to 70-90℃ and keep it constant for 2-3 hours; Raise the temperature to 110-150℃ and keep it constant for 4-6 hours.

[0028] To make the above and other purposes, features, and advantages of the present invention more clearly understood, the present invention is described below with reference to a number of embodiments. It should be understood that the embodiments described are only a portion of the embodiments of the present invention, and not all of them. All other embodiments derived by persons of ordinary skill in the art based on these embodiments without inventive effort are also within the scope of protection of the present invention.

[0029] Example 1: 93 parts by weight of bisphenol A epoxy resin (brand E54), 1 part by weight of triethanolamine, 0.5 parts by weight of a mercaptobenzothiazole derivative, and 12 parts of polypropylene glycol diglycidyl ether were mixed and stirred for 2 minutes to form a mixture 1, which was set aside. Separately, 69 parts by weight of methyltetrahydrophthalic anhydride and 1.667 parts by weight of dimethyldiallylammonium chloride were mixed and stirred for 2 minutes to form a mixture 2, which was set aside. Mixture 1 and mixture 2 were then mixed again and stirred for 2 minutes to form a new mixture. Comparative Example 1: 100 parts by weight of bisphenol A epoxy resin (brand E54) and 12 parts of polypropylene glycol diglycidyl ether were mixed with 80 parts by weight of methyltetrahydrophthalic anhydride and 3 parts by weight of a catalyst, and the mixture was stirred for 2 minutes to form a new mixture.

[0030] The mixtures of Example 1 and Comparative Example 1 were vacuum defoamed and cast into two sizes of sample molds respectively. They were cured at 80° C. for 2 h, heated to 150° C. for 3 h, and naturally cooled to room temperature for use.

[0031] The specimens from Example 1 and Comparative Example 1 were tested for antifungal properties according to GB / T 24128. The antifungal properties of the epoxy resin castings were tested using Escherichia coli (E. coli). The culture dishes containing the inoculated specimens were placed in a biological incubator at a temperature of 29°C ± 1°C and a relative humidity of ≥ 90% for 28 days. The mold growth level of the specimens after the test was measured. Figure 1 As shown: like Figure 1 As shown in the above test results, adding the resin casting sample of Example 1 has a significant anti-E. coli effect.

[0032] Example 2: 100 parts by weight of bisphenol A epoxy resin (brand E54) and 1 part by weight of triethanolamine were mixed and stirred for 2 minutes to form a mixture 1, which was set aside. 69 parts by weight of methyltetrahydrophthalic anhydride and 1.667 parts by weight of dimethyldiallylammonium chloride were mixed and stirred for 2 minutes to form a mixture 2, which was set aside. Mixture 1 was then mixed with mixture 2 and 12 parts of polypropylene glycol diglycidyl ether and stirred for 2 minutes to form a new mixture 3, to which 2.2 parts of an antibacterial agent (2 parts of acetone and 0.2 parts of an antibacterial agent) were added. Mixture 4 is vacuum defoamed and poured into a constant temperature range glue tank of 40℃-50℃. The glass fiber is immersed in the mixture 4 glue through the set yarn guide path. The mold is preheated to about 70℃. After cleaning the entire surface with a demoulding agent, the mixture 4 glue is poured on it. After the entire mold surface is completely covered with the glue, the lining felt and glass fiber are wound. After forming a resin-rich lining layer, the structural layer is made using the mixture 3 glue in combination with the fiber spiral direction. The cylinder thickness should not be less than 6mm. It is cured at 80℃ for 2h, heated to 150℃ for curing for 3h, and processed into a square GFRP arc surface specimen with a side length of 4cm and a thickness of 5mm after demoulding.

[0033] Comparative Example 2: 100 parts by weight of bisphenol A epoxy resin (brand E54) and 1 part by weight of triethanolamine were mixed and stirred for 2 minutes to form a mixture 1, which was set aside. 69 parts by weight of methyltetrahydrophthalic anhydride and 1.667 parts by weight of dimethyldiallylammonium chloride were mixed and stirred for 2 minutes to form a mixture 2, which was set aside. Mixture 1 was mixed with mixture 2 and 8 parts of polypropylene glycol diglycidyl ether and stirred for 2 minutes to form a new mixture 3. Mixture 3 was vacuum-defoamed and poured into a 40°C In the glue tank with a constant temperature range of -50℃, the glass fiber is immersed in the mixture 3 glue through the set yarn guide path. The mold is preheated to about 70℃. After cleaning the entire surface with a demoulding agent, the mixture 3 glue is sprinkled on it. After the entire mold surface is completely covered with the glue, the lining felt and glass fiber are wound to form a resin-rich lining layer. The structural layer is made in combination with the spiral direction of the fiber. The thickness of the cylinder should not be less than 6mm. It is cured at 80℃ for 2h, heated to 150℃ for curing for 3h, and processed into a square GFRP arc surface specimen with a side length of 4cm and a thickness of 5mm after demoulding.

[0034] Antibacterial testing of composite materials was conducted on Example 2 and Comparative Example 2 according to the "WS T650-2019 Method for Evaluating Antibacterial and Antimicrobial Effects." The antibacterial efficacy of four bacterial species, Clostridium perfringens, Citrobacter rodentium, Klebsiella, and thermotolerant Escherichia coli, was tested using a film application test. After 24 hours of activation, the bacterial strains were placed in a bacterial dilution solution. This solution was then dripped onto the center of the test sample. A plastic film was then applied to the center of the sample using tweezers, pressing the film to evenly distribute the dilution solution. This process was repeated for each bacterial species.

[0035] Incubate the inoculated sample in a 36°C, 90% % incubator for 24 hours. Use sterilized tweezers to place the sample and film into a sterile plastic bag. Add broth and nutrient solution. Rub the contents of the bag thoroughly by hand to remove bacteria. Aspirate the bacterial solution, dilute it, and add nutrient agar. Incubate in a 36°C, 90% % incubator for 48 hours.

[0036] Test results: The antibacterial effect of the resin is determined according to the formula 𝑅 = lg(𝐵 / C): R——antibacterial activity value; B——average number of viable bacteria in the control sample cultured for 24 hours after inoculation, CFU / sample; C - average number of viable bacteria in antimicrobial samples cultured 24 h after inoculation, CFU / sample.

[0037] R≥1.0 proves that the resin has antibacterial effect; R≥2.0 proves that the resin has strong antibacterial effect.

[0038]

[0039] like Figure 2 、 3 , 4, 5a and b and as shown in Table 1, the separation membrane shell sample of Example 2 has obvious antibacterial activity against the above 4 bacteria.

[0040] Example 3: The samples of Example 2 and Comparative Example 2 were immersed at 65°C for 30 h, and the antibacterial effects on Acidobacterium cloacae and Enterococcus faecalis were as follows: Table 2

[0041] like Figure 6 As shown in Table 2, the separation membrane shell sample of Example 3 has obvious antibacterial properties against the above two bacteria after being soaked at 65°C for 30 hours. Antibacterial performance: The antibacterial resin system casting has obvious antibacterial properties against Escherichia coli (E. coli); the separation membrane shell sample has obvious antibacterial effects on four bacteria, namely Clostridium perfringens, Citrobacter rodentium, Klebsiella and heat-resistant coliform bacteria; after being soaked at 65°C for 30 hours, it has obvious antibacterial properties against the above-mentioned Acidobacterium cloacae and Enterococcus faecalis. The above describes the specific embodiments of the present invention. It should be pointed out that the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various deformations or modifications within the scope of the claims, which does not affect the essential content of the present invention.

Claims

1. A method for preparing an antibacterial resin system, characterized in that: The following steps are involved: Step 1, mixing a bisphenol epoxy resin, an antibacterial agent, a wetting agent and an amine compound, and stirring them uniformly to obtain an epoxy resin mixture; Step 2: mixing the acid anhydride, toughening agent and quaternary ammonium salt compound, stirring evenly to obtain an acid anhydride mixture; Step 3: Pour the epoxy resin mixture into the acid anhydride mixture, mix and stir, add a thickener, and defoam to obtain an antibacterial resin system.

2. The method according to claim 1, characterized in that The mass ratio of bisphenol epoxy resin, acid anhydride, quaternary ammonium salt compound, amine compound and antibacterial agent is (9-11): (6-9): (0.1-0.35): (0.03-0.2): (0.005-0.05). The amount of wetting agent added is 1%~3% of the mass of bisphenol epoxy resin; The amount of toughening agent added is 5%~15% of the mass of bisphenol epoxy resin; The amount of thickener added is 0.5%~5% of the mass of bisphenol epoxy resin.

3. The method according to claim 1, characterized in that The bisphenol epoxy resin is bisphenol A epoxy resin, bisphenol F epoxy resin, hydrogenated bisphenol A epoxy resin or hydrogenated bisphenol F epoxy resin.

4. The method according to claim 1, characterized in that The antibacterial agent is mercaptobenzothiazole or its derivatives, wherein the derivatives are 2-mercaptobenzothiazole, imidazole [2,1-b] benzothiazole compounds, 2-mercaptobenzothiazole-2-methoxy or mercaptobenzothiazole sodium.

5. The method according to claim 1, characterized in that: The wetting agent is a polymer of alkyl glycidyl ether.

6. The method according to claim 1, characterized in that The amine compound is triethanolamine, tris(2-hydroxypropyl)amine, tris(2-hydroxyethyl)methylamine or tris(2-hydroxyethyl)aminopropylamine).

7. The method according to claim 1, characterized in that: The acid anhydride is methyltetrahydrophthalic anhydride, endomethene tetrahydrophthalic anhydride, methylhexahydrophthalic anhydride or methylendomethene tetrahydrophthalic anhydride.

8. The method according to claim 1, characterized in that: The toughening agent is polypropylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, fatty acid polyglycidyl ether, carboxyl liquid nitrile rubber or polyvinyl butyral.

9. The method according to claim 1, characterized in that: The quaternary ammonium salt compound is diallyl dimethylammonium chloride (DADMAC), acryloyloxyethyl trimethylammonium chloride (DAC), methacryloyloxyethyl trimethylammonium chloride (DMC) or methacrylamidopropyl trimethylammonium chloride (MAPTAC); the thickener is fumed silica (white carbon black).

10. A method for producing an antibacterial inner surface of a separation membrane, characterized in that: The fiber felt is impregnated with the antibacterial resin system according to any one of claims 1 to 9, subjected to glue control and then impregnation treatment, wound into a hollow column on a mold at a temperature of 50°C-90°C, transferred to a drying oven, heated to 70°C-90°C, kept at a constant temperature for 2h-3h, then heated to 110°C-150°C, kept at a constant temperature for 4h-6h, cooled and demolded to obtain the antibacterial inner surface of the separation membrane shell.

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