Anti-pollution reverse osmosis membrane and preparation method thereof

Abstract

The invention relates to the field of chemical engineering, in particular to an anti-pollution reverse osmosis membrane and a preparation method thereof.The anti-pollution reverse osmosis membrane comprises a reverse osmosis membrane body, a nano TiO2 outer protection layer is arranged on the outer side surface of the reverse osmosis membrane body, a guanidyl polymerization layer is arranged on the other side surface of the reverse osmosis membrane body, a nano TiO2 inner protection layer is arranged on the outer side surface of the guanidyl polymerization layer, and the nano TiO2 outer protection layer is arranged on the outer side surface of the guanidyl polymerization layer. Comprising the following steps: S1, guiding reverse osmosis membrane raw materials into a raw material mixer according to a proportion; when the reverse osmosis membrane enters a supporting and fixing plate, a liquid scraping soft plate on the surface of one side of the supporting and fixing plate is matched to scrape most of a solution on the surface of the reverse osmosis membrane, and at the moment, a circulating heater is matched to inject high-temperature air into a circulating air pipe, so that the circulating air pipe guides hot air into an exhaust plate; and then hot air penetrates through an exhaust plate to enter a supporting and fixing plate, and is matched with inlets and outlets in the two ends of the supporting and fixing plate under the limitation of a liquid scraping soft plate.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical industry, in particular to an anti-pollution reverse osmosis membrane and a preparation method thereof. Background Art

[0002] As a new type of high-efficiency separation, purification, concentration and purification technology, reverse osmosis membrane separation technology has developed rapidly in recent years and is widely used in industries such as pure water preparation, wastewater treatment and seawater desalination.

[0003] A patent with the publication number CN114768543B discloses a method for preparing an anti-pollution reverse osmosis membrane, comprising the following steps: grafting poly N, N-dimethylethyl methacrylate onto the surface of nano-TiO2 through emulsion polymerization; adding the grafted TiO2 particles into the base membrane casting solution, and uniformly coating the base membrane casting solution on the base membrane; soaking the surface of the base membrane in a polyamine solution and a polyacyl chloride solution, and preparing a composite reverse osmosis membrane through a phase inversion method; and coating the surface of the composite reverse osmosis membrane with a guanidine-based polymer to prepare a modified reverse osmosis membrane. The preparation method of the present invention is simple, the modification process conditions are mild, and the reproducibility is good. The prepared reverse osmosis membrane has the characteristics of anti-pollution, sterilization, and high flux, and maintains a good desalination rate.

[0004] In the current existing technology, traditional reverse osmosis membranes need to be soaked after they are produced. Since the soaking box is relatively thick, the fluctuation of water flow will only be transmitted on the top layer, and the bottom solution of some soaking boxes will be stable for a long time, which will cause the top solution and the bottom solution to settle and form stratification. The mixed solution inside the stratified solution will be relatively dilute, which will lead to the reverse osmosis membrane being not soaked thoroughly and the reverse osmosis membrane will have defects.

[0005] To this end, the present invention provides an anti-pollution reverse osmosis membrane and a preparation method thereof. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] In the first aspect, the technical solution adopted by the present invention to solve its technical problem is: the anti-pollution reverse osmosis membrane described in the present invention includes a reverse osmosis membrane, a nano-TiO2 outer protective layer is arranged on the outer surface of the reverse osmosis membrane, a guanidine-based polymer layer is arranged on the other side surface of the reverse osmosis membrane, and a nano-TiO2 inner protective layer is arranged on the outer surface of the guanidine-based polymer layer.

[0008] In a second aspect, a method for preparing an anti-pollution reverse osmosis membrane comprises the following steps:

[0009] S1, directing the reverse osmosis membrane raw materials into the raw material mixer according to the proportion, stirring and melting the raw materials, and directing the melted raw materials into the membrane making machine;

[0010] S2, extruding the raw material into a film, and moving the film into an isopropanol soaking box and a guanidine polymerization solution for soaking and shaping treatment;

[0011] S3. After the film is soaked, use a soft scraper to scrape off the excess liquid on the film surface;

[0012] S4, drying the film through a drying device, and utilizing the residual liquid to be adsorbed on the surface of the film through drying.

[0013] Preferably, S2 comprises the following steps:

[0014] S21, soaking the reverse osmosis membrane in an isopropanol water tank for 5 seconds, and then washing and soaking it with a guanidine polymerization solution; the pH of the aqueous solution is 8.8;

[0015] S22, contacting the reverse osmosis membrane with the polymerized aqueous phase solution in the isopropanol immersion box, removing the moisture on the reverse osmosis membrane, and then contacting the reverse osmosis membrane with the nano-TiO2 polymerized organic phase solution to obtain a pollution-resistant modified reverse osmosis membrane.

[0016] Preferably, the isopropanol soaking box contains a mixture of isopropanol water and polymerized aqueous phase solution;

[0017] The isopropanol water is one of isophthaloyl chloride, phthaloyl chloride, terephthaloyl chloride or trimesoyl chloride or a mixture of several of them; the mass concentration of the isopropanol water is 0.08wt%-0.4wt%; the organic solvent of the isopropanol water is one of n-hexane, cyclohexane, heptane, cyclohexane or isoparaffin solvents or several of them.

[0018] Preferably, the isopropanol immersion tank includes an isopropanol water tank and a guanidine polymerization water tank arranged on one side edge of the isopropanol water tank, a film making machine fixedly installed on the top surface of the isopropanol water tank and located on one side edge, a raw material mixer detachably installed on the input end of the film making machine, and a supporting fixing plate fixedly installed on the top surface of the guanidine polymerization water tank and located on one side edge, and the guanidine polymerization solution is filled in the interior of the guanidine polymerization water tank.

[0019] Preferably, a motor is fixedly installed on the outer surface of the isopropanol water tank and the guanidine polymerization water tank and located at the bottom edge position, and a transmission roller is movably sleeved on the bottom edge position of the isopropanol water tank and the guanidine polymerization water tank and located at the edge position of one side of the motor.

[0020] Preferably, the outer surface of the output end of the motor is movably sleeved with a transmission belt arranged on the outer surface of the transmission roller, and limited auxiliary transmission rollers are fixedly installed on the top surfaces of the isopropyl alcohol water tank and the guanidine polymerization water tank and at the edge positions on both sides.

[0021] Preferably, the surface of the reverse osmosis membrane is respectively arranged inside the isopropyl alcohol water tank, the guanidine polymerization water tank and the supporting fixed plate of the film making machine, and the outer surface of the reverse osmosis membrane is movably sleeved on the outer surface of the output end of the transmission roller, the limiting auxiliary transmission roller and the motor.

[0022] Preferably, a circulation heater is fixedly mounted on the bottom surface of the supporting and fixing plate, a guide chute movably overlapped on the bottom surface of the reverse osmosis membrane is arranged on the bottom inner wall surface of the supporting and fixing plate, a scraping soft plate movably attached to the outer surface of the reverse osmosis membrane is fixedly mounted on both side surfaces of the supporting and fixing plate, an exhaust plate is arranged on the top surface of the supporting and fixing plate, and a circulating air pipe arranged on the top surface of the exhaust plate is fixedly mounted on the output end of the circulating heater.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. The anti-pollution reverse osmosis membrane and the preparation method thereof described in the present invention, the film moves the reverse osmosis membrane into the isopropanol water tank and the guanidine polymerization water tank through a motor, and at this time, a certain gap is left between the reverse osmosis membrane and the isopropanol water tank and the guanidine polymerization water tank in cooperation with a driving roller and a limiting auxiliary driving roller, which can greatly increase the rapid mixing and adsorption between the isopropanol water, polymerization aqueous phase solution, aqueous phase reaction monomer solution and oil phase reaction monomer solution in the isopropanol water tank and the guanidine polymerization water tank and the surface of the reverse osmosis membrane, and the reverse osmosis membrane will drive the solution at the bottom of the isopropanol water tank and the guanidine polymerization water tank to move with the reverse osmosis membrane. The reverse osmosis membrane moves together with the reverse osmosis membrane. When the reverse osmosis membrane moves, the top solution is brought into the bottom layer, and the bottom solution is driven to the top layer, so that the solution forms a rotating vortex state, so that the top solution and the bottom solution are fully mixed, thereby increasing the shaping on the surface of the reverse osmosis membrane, and then obtaining an anti-pollution modified reverse osmosis membrane, which achieves the effect of utilizing the gap between the reverse osmosis membrane and the isopropanol water tank and the guanidine polymerization water tank to improve the reverse osmosis membrane and the solution inside the isopropanol water tank and the guanidine polymerization water tank. At the same time, the movement of the reverse osmosis membrane drives the mixing and blending effect between the top solution and the bottom solution;

[0025] 2. The anti-pollution reverse osmosis membrane and the preparation method thereof described in the present invention, when the reverse osmosis membrane enters the interior of the supporting fixed plate, the scraping soft plate on the surface of one side of the supporting fixed plate is used to scrape off most of the solution on the surface of the reverse osmosis membrane, and at this time, the circulating heater is used to infuse high-temperature air into the interior of the circulating air pipe, so that the circulating air pipe guides the hot air into the interior of the exhaust plate, and then the hot air passes through the exhaust plate and enters the interior of the supporting fixed plate, and the inlet and outlet at both ends of the supporting fixed plate are limited by the scraping soft plate, so that the hot air accumulates inside the supporting fixed plate, and the accumulated hot air will wrap the surface of the reverse osmosis membrane, so that the surface of the reverse osmosis membrane is always in a high temperature state, and then the hot air is used to dry the surface of the reverse osmosis membrane, so that the isopropyl alcohol water, polymerization aqueous phase solution, aqueous phase reaction monomer solution and oil phase reaction monomer solution on the surface of the reverse osmosis membrane are firmly adsorbed on the surface of the reverse osmosis membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Figure 1 is a stereogram of the present invention;

[0028] Figure 2 is a cutaway stereoscopic view of an isopropyl alcohol water tank in the present invention;

[0029] Figure 3 is a sectional stereoscopic view of a support fixing plate in the present invention;

[0030] Figure 4 is a three-dimensional diagram of the reverse osmosis membrane of the present invention;

[0031] Figure 5 is a cross-sectional stereoscopic view of the reverse osmosis membrane of the present invention;

[0032] Figure 6 It is a schematic diagram of the process of the present invention.

[0033] In the figure: 11, isopropanol water tank; 111, guanidine polymerization water tank; 112, motor; 113, drive roller; 114, drive track; 115, limit auxiliary drive roller; 12, film making machine; 13, raw material mixer; 14, reverse osmosis membrane; 141, nano-TiO2 outer protective layer; 142, guanidine polymerization layer; 143, nano-TiO2 inner protective layer; 15, supporting fixed plate; 151, circulation heater; 152, exhaust plate; 153, circulation air pipe; 154, scraper soft plate; 155, diversion chute. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0035] Example 1

[0036] like Figure 1-Figure 2 and Figures 4 to 5 As shown, an anti-pollution reverse osmosis membrane of an embodiment of the present invention includes a reverse osmosis membrane 14, a nano-TiO2 outer protective layer 141 is arranged on the outer surface of the reverse osmosis membrane 14, a guanidine-based polymer layer 142 is arranged on the other side surface of the reverse osmosis membrane 14, and a nano-TiO2 inner protective layer 143 is arranged on the outer surface of the guanidine-based polymer layer 142.

[0037] Example 2

[0038] like Figure 6 As shown, a method for preparing an anti-pollution reverse osmosis membrane comprises the following steps:

[0039] S1, directing the reverse osmosis membrane raw materials into the raw material mixer according to the proportion, stirring and melting the raw materials, and directing the melted raw materials into the membrane making machine;

[0040] S2, extruding the raw material into a film, and moving the film into an isopropanol soaking box and a guanidine polymerization solution for soaking and shaping treatment;

[0041] S3. After the film is soaked, use a soft scraper to scrape off the excess liquid on the film surface;

[0042] S4, drying the film through a drying device, and utilizing the residual liquid to be adsorbed on the surface of the film through drying.

[0043] The S2 comprises the following steps:

[0044] S21, soaking the reverse osmosis membrane in an isopropanol water tank for 5 seconds, and then washing and soaking it with a guanidine polymerization solution; the pH of the aqueous solution is 8.8;

[0045] S22, contacting the reverse osmosis membrane with the polymerized aqueous phase solution in the isopropanol immersion box, removing the moisture on the reverse osmosis membrane, and then contacting the reverse osmosis membrane with the nano-TiO2 polymerized organic phase solution to obtain a pollution-resistant modified reverse osmosis membrane.

[0046] The isopropanol soaking box contains a mixture of isopropanol water and a polymerized aqueous phase solution;

[0047] The isopropanol water is one of isophthaloyl chloride, phthaloyl chloride, terephthaloyl chloride or trimesoyl chloride or a mixture of several of them; the mass concentration of the isopropanol water is 0.08wt%-0.4wt%; the organic solvent of the isopropanol water is one of n-hexane, cyclohexane, heptane, cyclohexane or isoparaffin solvents or several of them.

[0048] like Figures 1 to 5As shown, the isopropanol soaking tank includes an isopropanol water tank 11 and a guanidine polymerization water tank 111 arranged at an edge position on one side of the isopropanol water tank 11, a film making machine 12 fixedly installed on the top surface of the isopropanol water tank 11 and located at an edge position on one side, a raw material mixer 13 detachably installed on the input end of the film making machine 12, a supporting fixing plate 15 fixedly installed on the top surface of the guanidine polymerization water tank 111 and located at an edge position on one side, a guanidine polymerization solution is filled in the guanidine polymerization water tank 111, and the surface of the reverse osmosis membrane 14 is respectively arranged in the isopropanol water tank 11 of the film making machine 12, the guanidine polymerization water tank 111 and the supporting fixing plate 15. A motor 112 is fixedly installed on the outer surface of the isopropanol water tank 111 and at the bottom edge position, a transmission roller 113 is movably sleeved on the bottom edge position of the isopropanol water tank 11 and the guanidine polymerization water tank 111 and at the side edge position of the motor 112, a transmission crawler 114 arranged on the outer surface of the transmission roller 113 is movably sleeved on the outer surface of the output end of the motor 112, and a limited auxiliary transmission roller 115 is fixedly installed on the top surface of the isopropanol water tank 11 and the guanidine polymerization water tank 111 and at the edge positions on both sides, and the outer surface of the reverse osmosis membrane 14 is movably sleeved on the transmission roller 113, the limited auxiliary transmission roller 115 and the outer surface of the output end of the motor 112.

[0049] The raw material mixer 13 is used to stir and mix the membrane raw materials, and at the same time, the membrane raw materials are heated to a semi-solidified viscous state by high temperature, and then the viscous stock solution inside the raw material mixer 13 is squeezed by the film making machine 12 to form a thin film state, and then the motor 112 is used to rotate to drive the transmission crawler 114 and the transmission roller 113 to rotate on the inner wall surface of the isopropanol water tank 11 and the guanidine polymerization water tank 111, thereby driving the reverse osmosis membrane 14 to be transmitted inside the isopropanol water tank 11 and the guanidine polymerization water tank 111. At this time, the transmission roller 113 and the limiting auxiliary transmission roller 115 are used to leave a certain gap between the reverse osmosis membrane 14 and the isopropanol water tank 11 and the guanidine polymerization water tank 111, which can greatly increase the rapid mixing and adsorption between the isopropanol water, polymerization aqueous phase solution, aqueous phase reaction monomer solution and oil phase reaction monomer solution inside the isopropanol water tank 11 and the guanidine polymerization water tank 111 and the surface of the reverse osmosis membrane 14, and the reverse osmosis membrane 14 will drive the isopropanol water tank 11 and the guanidine polymerization water tank 111 while moving. The solutions at the bottom of the propanol water tank 11 and the guanidine polymerization water tank 111 move together with the movement of the reverse osmosis membrane 14. When the reverse osmosis membrane 14 moves, the top solution is brought into the bottom layer, and the bottom solution is driven to the top layer, so that the solution forms a rotating vortex state, so that the top solution and the bottom solution are fully mixed, thereby increasing the shaping on the surface of the reverse osmosis membrane 14, and then obtaining an anti-pollution modified reverse osmosis membrane, and utilizing the gap between the reverse osmosis membrane 14 and the isopropanol water tank 11 and the guanidine polymerization water tank 111 to improve the reverse osmosis membrane 14 and the isopropanol water tank 11 and the guanidine polymerization water tank 111. The solution inside is fully mixed, and the movement of the reverse osmosis membrane 14 drives the mixing and blending effect between the top solution and the bottom solution, avoiding the traditional reverse osmosis membrane 14 only contacting at the top layer of the immersion tank, and the fluctuation of the water flow is only transmitted at the top layer. Under long-term stability, some solution drugs in the bottom solution of some immersion tanks will gradually settle in layers.

[0050] like Figures 1 to 5 As shown, a circulation heater 151 is fixedly installed on the bottom surface of the supporting and fixing plate 15, a guide chute 155 that is movably overlapped on the bottom surface of the reverse osmosis membrane 14 is arranged on the bottom inner wall surface of the supporting and fixing plate 15, a scraping soft plate 154 that is movably attached to the outer surface of the reverse osmosis membrane 14 is fixedly installed on both side surfaces of the supporting and fixing plate 15, an exhaust plate 152 is arranged on the top surface of the supporting and fixing plate 15, and a circulation air pipe 153 arranged on the top surface of the exhaust plate 152 is fixedly installed on the output end of the circulation heater 151.

[0051] When the reverse osmosis membrane 14 is circulated and soaked in the isopropanol water tank 11 and the guanidine polymerization water tank 111, a large amount of soaking solution will adhere to the surface of the reverse osmosis membrane 14. When the reverse osmosis membrane 14 enters the interior of the supporting and fixing plate 15, the scraping soft plate 154 on the surface of one side of the supporting and fixing plate 15 is used to scrape off most of the solution on the surface of the reverse osmosis membrane 14. At this time, the circulating heater 151 is used to infuse high-temperature air into the interior of the circulating air pipe 153, so that the circulating air pipe 153 guides the hot air into the interior of the exhaust plate 152, thereby allowing the hot air to pass through the exhaust plate 152. The plate 152 enters into the interior of the supporting and fixing plate 15, and cooperates with the inlet and outlet at both ends of the supporting and fixing plate 15 to be limited by the scraping soft plate 154, so that hot air accumulates inside the supporting and fixing plate 15, and the accumulated hot air will wrap the surface of the reverse osmosis membrane 14, so that the surface of the reverse osmosis membrane 14 is always in a high temperature state, and then the hot air is used to dry the surface of the reverse osmosis membrane 14, so that the isopropyl alcohol water, polymerization aqueous phase solution, aqueous phase reaction monomer solution and oil phase reaction monomer solution on the surface of the reverse osmosis membrane 14 are firmly adsorbed on the surface of the reverse osmosis membrane 14.

[0052] Working principle: The raw material mixer 13 is used to stir and mix the membrane raw materials, and the high temperature is used to heat the membrane raw materials to a semi-solidified viscous state, and then the viscous stock solution inside the raw material mixer 13 is squeezed by the film making machine 12 to form a thin film state, and then the motor 112 is used to rotate to drive the transmission crawler 114 and the transmission roller 113 to rotate on the inner wall surface of the isopropanol water tank 11 and the guanidine polymerization water tank 111, thereby driving the reverse osmosis membrane 14 to be transmitted inside the isopropanol water tank 11 and the guanidine polymerization water tank 111. At this time, the transmission roller 113 and the limiting auxiliary transmission roller 115 are used to leave a certain gap between the reverse osmosis membrane 14 and the isopropanol water tank 11 and the guanidine polymerization water tank 111, which can greatly increase the isopropanol water, polymerization aqueous phase solution, aqueous phase reaction monomer solution and oil phase reaction monomer solution inside the isopropanol water tank 11 and the guanidine polymerization water tank 111. Rapid mixing and adsorption are carried out between the surface of the reverse osmosis membrane 14, and while the reverse osmosis membrane 14 is moving, the solutions at the bottom of the isopropanol water tank 11 and the guanidine polymerization water tank 111 are driven to move together with the movement of the reverse osmosis membrane 14, and while the reverse osmosis membrane 14 is moving, the top solution is brought into the bottom layer, and the bottom solution is driven to the top layer, so that the solution forms a rotating vortex state, so that the top solution and the bottom solution are fully mixed, thereby increasing the shaping on the surface of the reverse osmosis membrane 14, and then obtaining a pollution-resistant modified reverse osmosis membrane, achieving the effect of utilizing the gap between the reverse osmosis membrane 14 and the isopropanol water tank 11 and the guanidine polymerization water tank 111, improving the reverse osmosis membrane 14 and the isopropanol water tank 11 and the guanidine polymerization water tank 111 The solution is fully mixed, and at the same time, the movement of the reverse osmosis membrane 14 drives the top solution and the bottom solution to mix and blend;

[0053] When the reverse osmosis membrane 14 is circulated and soaked in the isopropanol water tank 11 and the guanidine polymerization water tank 111, a large amount of soaking solution will adhere to the surface of the reverse osmosis membrane 14. When the reverse osmosis membrane 14 enters the interior of the supporting and fixing plate 15, the scraping soft plate 154 on the surface of one side of the supporting and fixing plate 15 is used to scrape off most of the solution on the surface of the reverse osmosis membrane 14. At this time, the circulating heater 151 is used to infuse high-temperature air into the interior of the circulating air pipe 153, so that the circulating air pipe 153 guides the hot air into the interior of the exhaust plate 152, thereby allowing the hot air to pass through the exhaust plate 152. The plate 152 enters into the interior of the supporting and fixing plate 15, and cooperates with the inlet and outlet at both ends of the supporting and fixing plate 15 to be limited by the scraping soft plate 154, so that hot air accumulates inside the supporting and fixing plate 15, and the accumulated hot air will wrap the surface of the reverse osmosis membrane 14, so that the surface of the reverse osmosis membrane 14 is always in a high temperature state, and then the hot air is used to dry the surface of the reverse osmosis membrane 14, so that the isopropyl alcohol water, polymerization aqueous phase solution, aqueous phase reaction monomer solution and oil phase reaction monomer solution on the surface of the reverse osmosis membrane 14 are firmly adsorbed on the surface of the reverse osmosis membrane 14.

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An anti-pollution reverse osmosis membrane, comprising a reverse osmosis membrane (14), characterized in that: A nano-TiO2 outer protective layer (141) is arranged on the outer surface of the reverse osmosis membrane (14), a guanidine-based polymer layer (142) is arranged on the other surface of the reverse osmosis membrane (14), and a nano-TiO2 inner protective layer (143) is arranged on the outer surface of the guanidine-based polymer layer (142).

2. A method for preparing an anti-pollution reverse osmosis membrane, applicable to the anti-pollution reverse osmosis membrane according to claim 1, characterized in that: The following steps are involved: S1, directing the reverse osmosis membrane raw materials into the raw material mixer according to the proportion, stirring and melting the raw materials, and directing the melted raw materials into the membrane making machine; S2, extruding the raw material into a film, and moving the film into an isopropanol soaking box and a guanidine polymerization solution for soaking and shaping treatment; S3. After the film is soaked, use a soft scraper to scrape off the excess liquid on the film surface; S4, drying the film through a drying device, and utilizing the residual liquid to be adsorbed on the surface of the film through drying.

3. The method for preparing an anti-pollution reverse osmosis membrane according to claim 2, characterized in that: The S2 comprises the following steps: S21, soaking the reverse osmosis membrane in an isopropanol water tank for 5 seconds, and then washing and soaking it with a guanidine polymerization solution; the pH of the aqueous solution is 8.8; S22, contacting the reverse osmosis membrane with the polymerized aqueous phase solution in the isopropanol immersion box, removing the moisture on the reverse osmosis membrane, and then contacting the reverse osmosis membrane with the nano-TiO2 polymerized organic phase solution to obtain a pollution-resistant modified reverse osmosis membrane.

4. The method for preparing an anti-pollution reverse osmosis membrane according to claim 3, characterized in that: The isopropanol soaking box contains a mixture of isopropanol water and a polymerized aqueous phase solution; The isopropanol water is one of isophthaloyl chloride, phthaloyl chloride, terephthaloyl chloride or trimesoyl chloride or a mixture of several of them; the mass concentration of the isopropanol water is 0.08wt%-0.4wt%; the organic solvent of the isopropanol water is one of n-hexane, cyclohexane, heptane, cyclohexane or isoparaffin solvents or several of them.

5. The method for preparing an anti-pollution reverse osmosis membrane according to claim 4, characterized in that: The isopropanol soaking tank comprises an isopropanol water tank (11) and a guanidine polymerization water tank (111) arranged at an edge position on one side of the isopropanol water tank (11), a film making machine (12) fixedly installed on the top surface of the isopropanol water tank (11) and located at an edge position on one side, a raw material mixer (13) detachably installed on the input end of the film making machine (12), and a supporting fixing plate (15) fixedly installed on the top surface of the guanidine polymerization water tank (111) and located at an edge position on one side, wherein the guanidine polymerization solution is filled in the guanidine polymerization water tank (111).

6. The method for preparing an anti-pollution reverse osmosis membrane according to claim 5, characterized in that: A motor (112) is fixedly mounted on the outer surfaces of the isopropanol water tank (11) and the guanidine polymerization water tank (111) and located at the bottom edge position, and a transmission roller (113) is movably sleeved on the bottom edge position of the isopropanol water tank (11) and the guanidine polymerization water tank (111) and located at the edge position of one side of the motor (112).

7. The method for preparing an anti-pollution reverse osmosis membrane according to claim 6, characterized in that: The outer surface of the output end of the motor (112) is movably sleeved with a transmission track (114) arranged on the outer surface of a transmission roller (113), and limited auxiliary transmission rollers (115) are fixedly installed on the top surfaces of the isopropyl alcohol water tank (11) and the guanidine polymerization water tank (111) and at the edge positions on both sides.

8. The method for preparing an anti-pollution reverse osmosis membrane according to claim 7, characterized in that: The surfaces of the reverse osmosis membrane (14) are respectively arranged inside the isopropyl alcohol water tank (11), the guanidine polymerization water tank (111) and the supporting fixed plate (15) of the film making machine (12), and the outer surface of the reverse osmosis membrane (14) is movably sleeved on the outer surface of the output end of the transmission roller (113), the limiting auxiliary transmission roller (115) and the motor (112).

9. The method for preparing an anti-pollution reverse osmosis membrane according to claim 6, characterized in that: A circulation heater (151) is fixedly mounted on the bottom surface of the supporting and fixing plate (15); a guide chute (155) movably overlapped on the bottom surface of the reverse osmosis membrane (14) is arranged on the bottom inner wall surface of the supporting and fixing plate (15); a liquid scraping soft plate (154) movably attached to the outer surface of the reverse osmosis membrane (14) is fixedly mounted on both side surfaces of the supporting and fixing plate (15); an exhaust plate (152) is arranged on the top surface of the supporting and fixing plate (15); and a circulation air pipe (153) arranged on the top surface of the exhaust plate (152) is fixedly mounted on the output end of the circulation heater (151).

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