High-permeability impact-resistant domestic sewage reuse treatment membrane and preparation method thereof

Abstract

The invention belongs to the technical field of water treatment materials. The invention relates to a domestic sewage treatment membrane, in particular to a high-permeability impact-resistant domestic sewage reuse treatment membrane and a preparation method thereof. The preparation method comprises the following specific preparation steps: carrying out irradiation pretreatment on polyvinylidene fluoride resin by adopting a high-energy electron beam to obtain pretreated polyvinylidene fluoride resin; the preparation method comprises the following steps: mixing pretreated polyvinylidene fluoride resin, brominated 1-ethyl-3-methylimidazole, monodisperse graphene oxide and polyvinylpyrrolidone, adding the mixture into a solvent N, N-dimethylacetamide, and carrying out a heating reaction so as to obtain a film forming solution; blade-coating the film-forming liquid to form a bottom layer liquid film with the thickness of 0.12-0.2 mm, pre-steaming in air for 30-60 seconds, and blade-coating a surface layer liquid film with the thickness of 0.1-0.15 mm on the surface of the bottom layer liquid film; and pre-steaming for 30-60 seconds again, putting into a water phase coagulating bath, soaking and coagulating, and drying to obtain the high-permeability impact-resistant domestic sewage recycling treatment membrane.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment materials. More specifically, it relates to a high-permeability and impact-resistant membrane for treating and recycling domestic sewage and a preparation method thereof. Background Art

[0002] When treating domestic sewage with a treatment membrane, it mainly utilizes the pore size selectivity of the membrane to separate pollutants from water through physical screening. For example, a microfiltration membrane achieves preliminary purification by intercepting large particulate impurities; an ultrafiltration membrane removes finer pollutants through a smaller pore size screening effect. In addition, the membrane bioreactor (MBR) technology combines membrane separation and biological treatment, using the filtration effect of the membrane and microorganisms on the biofilm to degrade organic matter, further improving the effluent quality.

[0003] Although the membrane treatment technology can effectively remove organic matter, suspended solids, microorganisms, etc. in sewage, the effluent quality is stable and superior to traditional treatment processes; and the membrane treatment equipment is compact and highly automated, suitable for applications in scenarios with limited space. However, in the actual application process, in order to obtain higher treatment efficiency, a treatment membrane with higher permeability is required, and a higher permeability often needs to be achieved with a higher porosity. At the same time, it may lead to a decrease in the strength of the treatment membrane; based on this, how to balance the two is still one of the technical problems to be faced. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: for the treatment membrane for traditional domestic sewage recycling, during use, in order to improve its permeability, its mechanical properties decline, thus affecting the service life of the product. The present invention provides a high-permeability and impact-resistant membrane for treating and recycling domestic sewage and a preparation method thereof.

[0005] The object of the present invention is to provide a preparation method for a high-permeability and impact-resistant membrane for treating and recycling domestic sewage.

[0006] Another object of the present invention is to provide a high-permeability and impact-resistant membrane for treating and recycling domestic sewage.

[0007] The above objects of the present invention are achieved by the following technical solutions:

[0008] A preparation method for a high-permeability and impact-resistant membrane for treating and recycling domestic sewage, the specific preparation steps include:

[0009] Irradiate and pre-treat polyvinylidene fluoride resin with a high-energy electron beam to obtain pre-treated polyvinylidene fluoride resin;

[0010] The pretreated polyvinylidene fluoride resin, 1-ethyl-3-methylimidazolium bromide and polyvinylpyrrolidone are mixed and added to the solvent N,N-dimethylacetamide. After heating and reacting, a film-forming solution is obtained.

[0011] The film-forming solution is scraped to form a bottom liquid film with a thickness of 0.12 - 0.2 mm. After pre-evaporating in air for 30 - 60 s, a surface liquid film with a thickness of 0.1 - 0.15 mm is scraped on the surface of the bottom liquid film; after pre-evaporating again for 30 - 60 s, it is placed in an aqueous coagulation bath, soaked and solidified, and then dried to obtain a domestic sewage reuse treatment membrane with high permeability and impact resistance.

[0012] Among them, in the film-forming solution, the raw materials include the following parts by weight:

[0013] 20 - 22 parts of pretreated polyvinylidene fluoride resin, 3 - 5 parts of 1-ethyl-3-methylimidazolium bromide, 0.3 - 0.5 parts of polyvinylpyrrolidone, 90 - 100 parts of N,N-dimethylacetamide.

[0014] The beneficial effects of the above technical solution:

[0015] The above technical solution prepares the product by adopting a double-layer forming method, and controls the thickness of the two liquid films within a reasonable range. In this way, after pre-evaporating the bottom liquid film, a surface liquid film can be formed on its surface again, thus constructing the aforementioned double-layer forming method.

[0016] The advantages of doing so are as follows. First, the bottom liquid film and the surface liquid film are scraped and formed with the same material, and when scraping the surface liquid film, it is carried out after pre-evaporation. At this time, the bottom liquid film has a certain strength, and at the same time, a well-combined interface can also be formed during the scraping process; second, through two-time scraping and forming, the problem that the porosity of the bottom layer is too low caused by one-time forming, which affects the permeation ability, is avoided; through two-time scraping, the bottom layer and the surface layer are respectively pre-evaporated for a certain time, and the basic pore structure is maintained, and it is completely formed in the coagulation bath to form a continuous passage, ensuring that the porosities of the bottom layer and the surface layer are basically the same; third, the good combination of the two interfaces maintains the overall physical strength of the treatment membrane, enabling the product to take into account the mechanical properties.

[0017] Furthermore, the specific preparation steps further include:

[0018] In the film-forming solution, graphene oxide accounting for 3 - 5% of the mass of the pretreated polyvinylidene fluoride resin is added.

[0019] Furthermore, the graphene oxide is monodisperse graphene oxide, and the particle size distribution range of the monodisperse graphene oxide is 10 - 30 μm.

[0020] Further, a silane coupling agent is intercalated between the layers of the graphene oxide; the specific intercalation steps include:

[0021] The graphene oxide is ultrasonically dispersed in an ethanol solution, and then a silane coupling agent accounting for 8-10% of the mass of the graphene oxide is added. After heating and reacting, filtration, washing and drying are carried out.

[0022] The beneficial effects of the above technical solution are as follows:

[0023] First of all, by adding graphene oxide, the oxygen-containing functional groups in its molecular structure are used to provide good adsorption capacity. However, the inventor found that if the dosage of graphene oxide is too much, during the treatment of domestic sewage, under the immersion of domestic sewage, too much organic matter with polar functional groups and water in domestic sewage will contact with graphene oxide, resulting in the swelling of graphene oxide. In the long run, the membrane performance will decay; therefore, its addition amount must be controlled below 5%.

[0024] Further, monodisperse graphene oxide with a relatively narrow particle size distribution range is selected, so that after it is dispersed in the PVDF system, the properties of the graphene oxide components in each part of the treatment membrane tend to be consistent. Thus, it is possible to avoid uneven local mechanical properties or adsorption capacity for impurities in domestic sewage, resulting in local failure.

[0025] In addition, the inventor found that by intercalating a certain amount of silane coupling agent between the layers of graphene oxide, first, under the physical cavitation effect of ultrasonic waves, the layers of graphene oxide are separated from each other. After the grafting introduction of the silane coupling agent, during the filtration process, the layered structure of graphene oxide is re-stacked. At this time, under the action of the silane coupling agent, the distance between the layers is expanded. Thus, it is beneficial to form a strong physical anchoring effect between the molecular chains after the PVDF unfolds and the graphene oxide layers; secondly, under the action of the silane coupling agent, the widened layer spacing is conducive to the exposure of the internal oxygen-containing functional groups, thereby improving its adsorption capacity.

[0026] Further, the ultrasonic dispersion is carried out at an ultrasonic frequency of 180-200 kHz and a temperature of 30-50 °C for 30-100 min.

[0027] Further, the silane coupling agent is selected from any one of silane coupling agent KH-540, silane coupling agent KH-550, silane coupling agent KH-560, silane coupling agent KH-570, and silane coupling agent KH-580.

[0028] Further, the ethanol solution is an ethanol solution with a mass fraction of 40-60%, and the dosage of the ethanol solution is 15-20 times the mass of the graphene oxide.

[0029] Further, the thickness of the bottom liquid film is greater than that of the surface liquid film; and, the thickness of the bottom liquid film is 0.18 - 0.2 mm; the thickness of the surface liquid film is 0.1 - 0.12 mm.

[0030] The above technical solution further differentiates the thickness of the bottom liquid film and the surface liquid film. In particular, the thickness of the bottom layer is made greater than that of the surface liquid film. The thicker bottom layer can provide stable support, while the thinner surface layer can quickly respond to the filtration requirements, reducing the risk of membrane blockage, thereby improving the long-term operation stability of the membrane.

[0031] Further, the irradiation pretreatment includes:

[0032] Irradiating polyvinylidene fluoride resin with a high-energy electron beam of 10 - 12 MeV until the absorbed dose reaches 35 - 45 kGy to obtain pretreated polyvinylidene fluoride resin.

[0033] A domestic sewage reuse treatment membrane with high permeability and impact resistance is prepared by the above preparation method. Specific Embodiments

[0034] The following specific examples are used to further illustrate the present invention, but the examples do not limit the present invention in any form. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in the technical field.

[0035] Unless otherwise specified, the reagents and materials used in the following examples are all commercially available.

[0036] In the monodisperse hollow nanoparticles mentioned below, the specific meaning of "hollow" is that during the preparation process, by using emulsifiers and other means, air bubbles are introduced to make the interior of the particles in a hollow state, so as to distinguish from the completely solid state.

[0037] Example 1

[0038] Pretreatment of polyvinylidene fluoride resin:

[0039] Place polyvinylidene fluoride in an oven and dry it to constant weight at a temperature of 60 °C, then irradiate the polyvinylidene fluoride resin with a high-energy electron beam of 10 MeV until the absorbed dose reaches 35 kGy to obtain pretreated polyvinylidene fluoride resin;

[0040] Preparation of the film-forming solution:

[0041] According to the weight parts, prepare the following raw materials:

[0042] 20 parts of pretreated polyvinylidene fluoride resin, 3 parts of 1-ethyl-3-methylimidazolium bromide, 0.3 part of polyvinylpyrrolidone, 90 parts of N,N-dimethylacetamide; and 3% by mass of the pretreated polyvinylidene fluoride resin of silane coupling agent modified graphene oxide;

[0043] Among them, the preparation of the silane coupling agent modified graphene oxide includes:

[0044] Pour graphene oxide into an ethanol solution, under the conditions of an ultrasonic frequency of 180 kHz and a temperature of 30 °C, ultrasonically disperse for 30 min, then add 8% by mass of the graphene oxide of the silane coupling agent, under the conditions of a temperature of 60 °C and a stirring speed of 300 r / min, heat and react for 40 min, then perform suction filtration, collect the filter cake, wash the filter cake 3 times with deionized water, and then dry to constant weight at a temperature of 100 °C to obtain silane coupling agent modified graphene oxide;

[0045] The graphene oxide is monodisperse graphene oxide, and the particle size distribution range of the monodisperse graphene oxide is 10 - 30 μm;

[0046] The ethanol solution is an ethanol solution with a mass fraction of 40%, and moreover, the dosage of the ethanol solution is 15 times the mass of the graphene oxide;

[0047] The silane coupling agent is selected from silane coupling agent KH-540;

[0048] Mix the pretreated polyvinylidene fluoride resin, 1-ethyl-3-methylimidazolium bromide, polyvinylpyrrolidone and silane coupling agent modified graphene oxide and add them to the solvent N,N-dimethylacetamide, under the conditions of a temperature of 60 °C and a stirring speed of 180 r / min, continuously heat and react for 6 h, then keep warm and stand for 8 h to obtain a film-forming solution;

[0049] Coating and forming:

[0050] Scrape the film-forming solution into a bottom liquid film with a thickness of 0.18 mm, pre-evaporate in air for 30 s, and then scrape a surface liquid film with a thickness of 0.12 mm on the surface of the bottom liquid film; after pre-evaporating again for 30 s, place it in an aqueous coagulation bath at a temperature of 25 °C, soak and solidify for 24 h, and then dry to obtain a high-permeability and impact-resistant domestic sewage reuse treatment membrane.

[0051] Example 2

[0052] Pretreatment of polyvinylidene fluoride resin:

[0053] Place polyvinylidene fluoride in an oven, dry to constant weight at a temperature of 60 °C, and then perform irradiation pretreatment on the polyvinylidene fluoride resin with a high-energy electron beam of 11 MeV until the absorbed dose reaches 44 kGy to obtain pretreated polyvinylidene fluoride resin;

[0054] Preparation of the film-forming solution:

[0055] Prepare the following raw materials according to parts by weight:

[0056] 21 parts of pretreated polyvinylidene fluoride resin, 4 parts of 1-ethyl-3-methylimidazolium bromide, 0.4 part of polyvinylpyrrolidone, 95 parts of N,N-dimethylacetamide; and graphene oxide modified with a silane coupling agent accounting for 4% of the mass of the pretreated polyvinylidene fluoride resin;

[0057] Among them, the preparation of the graphene oxide modified with a silane coupling agent includes:

[0058] Pour graphene oxide into an ethanol solution, under the conditions of an ultrasonic frequency of 190 kHz and a temperature of 40 °C, ultrasonically disperse for 60 min, then add a silane coupling agent accounting for 9% of the mass of graphene oxide, under the conditions of a temperature of 62 °C and a stirring speed of 300 r / min, heat and react for 60 min, then carry out suction filtration, collect the filter cake, wash the filter cake 4 times with deionized water, and then dry to constant weight at a temperature of 100 °C to obtain graphene oxide modified with a silane coupling agent;

[0059] The graphene oxide is monodisperse graphene oxide, and the particle size distribution range of the monodisperse graphene oxide is 10 - 30 μm;

[0060] The ethanol solution is an ethanol solution with a mass fraction of 50%, and moreover, the dosage of the ethanol solution is 18 times the mass of the graphene oxide;

[0061] The silane coupling agent is selected from silane coupling agent KH-550;

[0062] Mix the pretreated polyvinylidene fluoride resin, 1-ethyl-3-methylimidazolium bromide, polyvinylpyrrolidone and graphene oxide modified with a silane coupling agent and add them to the solvent N,N-dimethylacetamide, under the conditions of a temperature of 60 °C and a stirring speed of 180 r / min, continuously heat and react for 7 h, then keep warm and stand for 10 h to obtain the film-forming solution;

[0063] Coating and forming:

[0064] Scrape the film-forming solution into a bottom liquid film with a thickness of 0.19 mm, pre-evaporate in air for 40 s, and then scrape a surface liquid film with a thickness of 0.11 mm on the surface of the bottom liquid film; after pre-evaporating for 40 s again, place it in an aqueous coagulation bath at a temperature of 25 °C, soak and solidify for 32 h, and then dry to obtain a high-permeability and impact-resistant domestic sewage reuse treatment membrane.

[0065] Example 3

[0066] Pretreatment of polyvinylidene fluoride resin:

[0067] Place polyvinylidene fluoride in an oven and dry it to a constant weight at a temperature of 60 °C. Then, irradiate the polyvinylidene fluoride resin with a high-energy electron beam of 12 MeV until the absorbed dose reaches 45 kGy to obtain a pretreated polyvinylidene fluoride resin.

[0068] Preparation of the film-forming solution:

[0069] Prepare the following raw materials according to weight parts:

[0070] 22 parts of pretreated polyvinylidene fluoride resin, 5 parts of 1-ethyl-3-methylimidazolium bromide, 0.5 part of polyvinylpyrrolidone, 100 parts of N,N-dimethylacetamide; and graphene oxide modified with a silane coupling agent accounting for 5% of the mass of the pretreated polyvinylidene fluoride resin.

[0071] Among them, the preparation of the graphene oxide modified with a silane coupling agent includes:

[0072] Pour graphene oxide into an ethanol solution, and under the conditions of an ultrasonic frequency of 200 kHz and a temperature of 50 °C, ultrasonically disperse for 100 min. Then add a silane coupling agent accounting for 10% of the mass of graphene oxide, and under the conditions of a temperature of 65 °C and a stirring speed of 300 r / min, heat and react for 80 min. After that, perform suction filtration, collect the filter cake, wash the filter cake 5 times with deionized water, and dry it to a constant weight at a temperature of 100 °C to obtain graphene oxide modified with a silane coupling agent.

[0073] The graphene oxide is monodisperse graphene oxide, and the particle size distribution range of the monodisperse graphene oxide is 10 - 30 μm.

[0074] The ethanol solution is an ethanol solution with a mass fraction of 60%, and moreover, the dosage of the ethanol solution is 20 times the mass of the graphene oxide.

[0075] The silane coupling agent is selected from silane coupling agent KH-560.

[0076] Mix the pretreated polyvinylidene fluoride resin, 1-ethyl-3-methylimidazolium bromide, polyvinylpyrrolidone, and graphene oxide modified with a silane coupling agent and add them to the solvent N,N-dimethylacetamide. Under the conditions of a temperature of 60 °C and a stirring speed of 180 r / min, continuously heat and react for 8 h, then keep warm and stand for 12 h to obtain a film-forming solution.

[0077] Coating and forming:

[0078] The film-forming liquid is doctor-bladed into a bottom liquid film with a thickness of 0.2 mm. After pre-evaporating in air for 60 s, a top layer liquid film with a thickness of 0.1 mm is doctor-bladed on the surface of the bottom liquid film. After pre-evaporating again for 60 s, it is placed in an aqueous coagulation bath at a temperature of 25 °C, soaked and coagulated for 36 h, and then dried to obtain a domestic sewage reuse treatment membrane with high permeability and impact resistance.

[0079] Example 4

[0080] The difference between this example and Example 1 is as follows:

[0081] Coating and forming:

[0082] The film-forming liquid is doctor-bladed into a bottom liquid film with a thickness of 0.12 mm. After pre-evaporating in air for 30 s, a top layer liquid film with a thickness of 0.12 mm is doctor-bladed on the surface of the bottom liquid film. After pre-evaporating again for 30 s, it is placed in an aqueous coagulation bath at a temperature of 25 °C, soaked and coagulated for 24 h, and then dried to obtain a domestic sewage reuse treatment membrane with high permeability and impact resistance.

[0083] The remaining conditions remain unchanged.

[0084] Example 5

[0085] The difference between this example and Example 1 is as follows:

[0086] Coating and forming:

[0087] The film-forming liquid is doctor-bladed into a bottom liquid film with a thickness of 0.12 mm. After pre-evaporating in air for 30 s, a top layer liquid film with a thickness of 0.15 mm is doctor-bladed on the surface of the bottom liquid film. After pre-evaporating again for 30 s, it is placed in an aqueous coagulation bath at a temperature of 25 °C, soaked and coagulated for 24 h, and then dried to obtain a domestic sewage reuse treatment membrane with high permeability and impact resistance.

[0088] The remaining conditions remain unchanged.

[0089] Example 6

[0090] The difference between this example and Example 1 is that no silane coupling agent is added, and the remaining conditions remain unchanged.

[0091] Example 7

[0092] The difference between this example and Example 1 is that no graphene oxide modified with silane coupling agent is added, and the remaining conditions remain unchanged.

[0093] Comparative Example 1

[0094] The difference between this comparative example and Example 1 is as follows:

[0095] Coating and forming:

[0096] The film-forming liquid is scrape-coated into an underlying liquid film with a thickness of 0.3 mm. After pre-evaporating in air for 30 s, it is placed in an aqueous coagulation bath at a temperature of 25 °C and soaked for 24 h for coagulation, and then dried to obtain a domestic sewage reuse treatment membrane with high permeability and impact resistance.

[0097] The remaining conditions remain unchanged.

[0098] The products obtained in the above examples and comparative examples were subjected to performance tests. The specific test methods and test results are as follows:

[0099] Calculated by weight, 800 parts of deionized water, 2 parts of edible soybean oil, 0.3 part of sodium dodecylbenzenesulfonate, 1 part of carboxymethyl cellulose, 0.2 part of sodium chloride, and 0.02 part of sodium carbonate were taken and stirred and emulsified at a speed of 8000 r / min for 8 h with a stirrer to obtain a simulated sewage emulsion;

[0100] In the dead-end filtration mode, an ultrafiltration cup device was selected to test the separation performance of the treatment membrane samples of each example and comparative example; at a pressure of 0.15 MPa, the treatment membrane samples of each example and comparative example were pre-pressed for 40 min respectively to prevent the influence of pressure change on the test results, and then a stable flux was obtained. Subsequently, the simulated sewage emulsion was passed through the treatment membranes of each example and comparative example to be tested. After 3 min, the filtrate was collected;

[0101] Then the membrane flux = filtrate volume / (treatment membrane area × permeation time);

[0102] Among them, the unit of the filtrate volume is L; the treatment membrane area is uniformly 0.02 m²; the unit of the permeation time is h;

[0103] The specific test results are shown in Table 1;

[0104] The products obtained in the examples and comparative examples were cut into square membrane pieces with a specification of 10 cm. After soaking in pure water for 10 min, compressed air with a pressure of 0.5 MPa and an air outlet diameter of 1 square centimeter was used to continuously impact the membrane pieces in the positive direction, and the time when the membrane pieces began to be damaged was observed;

[0105] Note that during the water treatment process, the side of the surface liquid film is selected to face the side of the water to be treated, and when using compressed air to impact, it is also directed at the side of the surface liquid film;

[0106] The detailed test results are shown in Table 1;

[0107] Table 1: Product performance test results

[0108]

[0109]

[0110] As can be seen from the test results in Table 1, the products obtained by the present invention can take into account good filtering ability and impact resistance.

[0111] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A method for preparing a high-permeability and impact-resistant domestic sewage recycling treatment membrane, characterized in that: The specific preparation steps include: The polyvinylidene fluoride resin is irradiated and pretreated by a high-energy electron beam to obtain a pretreated polyvinylidene fluoride resin; The pretreated polyvinylidene fluoride resin, 1-ethyl-3-methylimidazole bromide and polyvinyl pyrrolidone are mixed and added into a solvent N, N-dimethylacetamide, and heated for reaction to obtain a membrane-forming solution; The film-forming liquid is scraped to form a bottom layer liquid film with a thickness of 0.12-0.2 mm, and after pre-steaming in the air for 30-60 seconds, a surface layer liquid film with a thickness of 0.1-0.15 mm is scraped on the surface of the bottom layer liquid film; after pre-steaming again for 30-60 seconds, it is placed in an aqueous coagulation bath, immersed and coagulated, and then dried to obtain a high-permeability and impact-resistant domestic sewage reuse treatment membrane; The film-forming solution includes the following raw materials in parts by weight: 20-22 parts of pretreated polyvinylidene fluoride resin, 3-5 parts of 1-ethyl-3-methylimidazole bromide, 0.3-0.5 parts of polyvinyl pyrrolidone, and 90-100 parts of N, N-dimethylacetamide.

2. The method for preparing a high-permeability and impact-resistant domestic sewage recycling treatment membrane according to claim 1, characterized in that: The specific preparation steps also include: 3-5% of the mass of the pretreated polyvinylidene fluoride resin in graphene oxide is added to the film-forming solution.

3. The method for preparing a high-permeability and impact-resistant domestic sewage recycling treatment membrane according to claim 2, characterized in that: The graphene oxide is monodisperse graphene oxide, and the particle size distribution range of the monodisperse graphene oxide is 10-30 μm.

4. The method for preparing a high-permeability and impact-resistant domestic sewage recycling membrane according to any one of claims 2 or 3, characterized in that: A silane coupling agent is embedded between the layers of the graphene oxide; the specific embedding steps include: The graphene oxide is ultrasonically dispersed in an ethanol solution, and then a silane coupling agent is added in an amount of 8-10% of the mass of the graphene oxide. After heating for reaction, the solution is filtered, washed and dried.

5. The method for preparing a high-permeability and impact-resistant domestic sewage recycling treatment membrane according to claim 4, characterized in that: The ultrasonic dispersion is as follows: ultrasonic dispersion is performed for 30-100 minutes at an ultrasonic frequency of 180-200 kHz and a temperature of 30-50°C.

6. The method for preparing a high-permeability and impact-resistant domestic sewage recycling treatment membrane according to claim 4, characterized in that: The silane coupling agent is selected from any one of silane coupling agent KH-540, silane coupling agent KH-550, silane coupling agent KH-560, silane coupling agent KH-570 and silane coupling agent KH-580.

7. The method for preparing a high-permeability and impact-resistant domestic sewage recycling membrane according to claim 4, characterized in that: The ethanol solution is an ethanol solution with a mass fraction of 40-60%, and the amount of the ethanol solution is 15-20 times the mass of the graphene oxide.

8. The method for preparing a high-permeability and impact-resistant domestic sewage recycling treatment membrane according to claim 1, characterized in that: The thickness of the bottom layer liquid film is greater than the thickness of the surface layer liquid film; and the thickness of the bottom layer liquid film is 0.18-0.2 mm; the thickness of the surface layer liquid film is 0.1-0.12 mm.

9. The method for preparing a high-permeability and impact-resistant domestic sewage recycling treatment membrane according to claim 1, characterized in that: The irradiation pretreatment comprises: The polyvinylidene fluoride resin is irradiated and pretreated by using a high-energy electron beam of 10-12 MeV until the absorbed dose reaches 35-45 kGy to obtain the pretreated polyvinylidene fluoride resin.

10. A high permeability and impact-resistant domestic sewage recycling treatment membrane, characterized in that: The invention is prepared by the preparation method according to any one of claims 1 to 9.

Images