Corrosion-resistant high-strength aerator diaphragm and preparation method thereof

Abstract

The invention discloses a corrosion-resistant high-strength aerator diaphragm and a preparation method thereof, and belongs to the technical field of rubber materials. The corrosion-resistant high-strength aerator diaphragm is prepared from the following raw materials: a silane coupling agent, white carbon black, multiwalled carbon nanotubes, modified ethylene propylene diene monomer, fluororubber, a compatilizer, aramid fibers, dicumyl peroxide, triallyl isocyanurate, 4, 4 '-bis (alpha, alpha'-dimethylbenzyl) diphenylamine, silver-loaded zeolite, stearic acid, zinc oxide and azodicarbonamide. According to the EPDM / FKM blending system disclosed by the invention, a molecular-level interpenetrating network structure is formed through directional regulation and control of the compatilizer, so that the material can resist a corrosion environment; through a specific raw material ratio and a unique process flow, the corrosion-resistant aerator has enough strength while ensuring excellent corrosion resistance, so that the requirements of various complex application scenes are met, the overall performance of the aerator is improved, the service life of the aerator is prolonged, and the maintenance cost of equipment is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of rubber materials, and more particularly relates to a corrosion-resistant high-strength aerator diaphragm and a preparation method thereof. Background Art

[0002] As a key aeration device in multiple fields, diaphragm microporous aerators continue to expand their application scope, covering a wide range of fields, including water treatment, environmental protection, chemical industry, and aquaculture. In the water treatment field, whether it is the purification of municipal sewage or the treatment of industrial wastewater and reclaimed water reuse projects, diaphragm microporous aerators have become indispensable equipment, used to increase the dissolved oxygen content in water, promote the decomposition of pollutants by microorganisms, and improve water quality treatment effects.

[0003] Although the diaphragm microporous aerator industry has a good development trend, many problems are still exposed in the actual application process, especially in the performance of the aerator diaphragm, there are some shortcomings that need to be solved urgently.

[0004] In industrial wastewater treatment, wastewater often contains various acids, alkalis, salts, and organic solvents. These corrosive components can continuously corrode the aerator diaphragm. Under such conditions, diaphragms made of standard materials can quickly corrode, leading to surface damage and perforations. Once the diaphragm is corroded and damaged, it not only significantly reduces aeration effectiveness, preventing adequate dissolved oxygen supply in the water, impacting wastewater treatment and causing substandard effluent quality, but also requires frequent diaphragm replacement, increasing equipment maintenance costs and downtime, impacting production continuity. Furthermore, during aerator operation, the diaphragm must withstand the impact of gas pressure and water flow. If the diaphragm is not strong enough, it is prone to tearing and breaking. Over time, the tearing will gradually expand, eventually causing the diaphragm to malfunction.

[0005] Existing aerator diaphragms commonly suffer from a significant issue that severely impacts their performance and service life: the inability to achieve both excellent corrosion resistance and high strength. Many materials chosen for corrosion resistance often exhibit poor strength and are soft, making them unable to withstand significant pressure and impact. Conversely, some high-strength materials exhibit corrosion resistance flaws and are easily eroded in corrosive environments. For example, some diaphragms primarily made of rubber offer a degree of flexibility and good initial sealing properties, allowing them to function properly in normal environments. However, when exposed to highly corrosive media, the rubber swells and ages, causing the diaphragm's strength to drop dramatically, quickly rendering it unusable. While some diaphragms made of metal or high-strength plastic offer high strength and can withstand significant pressure and impact, they are susceptible to chemical reactions and corrosion in most corrosive aqueous environments. This conflict between corrosion resistance and strength severely limits the application of aerator diaphragms in complex and harsh environments, hindering the further development of the diaphragm-type microporous aerator industry as a whole. Summary of the Invention

[0006] In response to the aforementioned problems with the prior art, the present invention aims to provide a method for preparing a corrosion-resistant, high-strength aerator membrane. Through the use of specific raw material ratios and a unique process flow, the method achieves excellent corrosion resistance while also providing sufficient strength to meet the needs of various complex application scenarios, thereby improving the overall performance and service life of the aerator and reducing equipment maintenance costs. The present invention also provides an aerator membrane produced by the above-mentioned method, which exhibits both excellent mechanical properties and corrosion resistance.

[0007] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0008] A corrosion-resistant high-strength aerator membrane is composed of the following raw materials in parts by mass: 1-3 parts of a silane coupling agent, 15-25 parts of white carbon black, 1-5 parts of multi-walled carbon nanotubes, 40-70 parts of modified EPDM rubber, 25-55 parts of fluororubber, 5-10 parts of a compatibilizer, 2-8 parts of aramid fiber, 1-3 parts of dicumyl peroxide, 1-2 parts of triallyl isocyanurate, 1-2 parts of 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine, 3-5 parts of silver-loaded zeolite, 1-3 parts of stearic acid, 1-3 parts of zinc oxide, and 2-3 parts of azodicarbonamide.

[0009] Preferably, the corrosion-resistant high-strength aerator membrane is composed of the following raw materials in parts by mass: 1 to 2 parts of silane coupling agent, 15 to 25 parts of white carbon black, 2 to 5 parts of multi-walled carbon nanotubes, 40 to 60 parts of modified EPDM rubber, 30 to 55 parts of fluororubber, 5 to 10 parts of compatibilizer, 2 to 8 parts of aramid fiber, 2 to 3 parts of diisopropyl benzene peroxide, 1 to 2 parts of triallyl isocyanurate, 1 to 2 parts of 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine, 3 to 4 parts of silver-loaded zeolite, 1 to 2 parts of stearic acid, 1 to 2 parts of zinc oxide, and 2 to 3 parts of azodicarbonamide.

[0010] Preferably, the corrosion-resistant high-strength aerator membrane is composed of the following raw materials in parts by mass: 1.5 parts of silane coupling agent, 20-25 parts of white carbon black, 3-5 parts of multi-walled carbon nanotubes, 50-65 parts of modified EPDM rubber, 30-45 parts of fluororubber, 5 parts of compatibilizer, 2-5 parts of aramid fiber, 2-3 parts of diisopropylbenzene peroxide, 1-2 parts of triallyl isocyanurate, 1-2 parts of 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine, 3-4 parts of silver-loaded zeolite, 1-2 parts of stearic acid, 1-2 parts of zinc oxide, and 2-3 parts of azodicarbonamide.

[0011] Preferably, the corrosion-resistant high-strength aerator membrane is composed of the following raw materials in parts by mass: 1.5 parts of silane coupling agent, 20 parts of white carbon black, 3 parts of multi-walled carbon nanotubes, 65 parts of modified EPDM rubber, 30 parts of fluororubber, 5 parts of compatibilizer, 5 parts of aramid fiber, 2-3 parts of dicumyl peroxide, 1 part of triallyl isocyanurate, 1-2 parts of 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine, 4 parts of silver-loaded zeolite, 1 part of stearic acid, 2 parts of zinc oxide, and 3 parts of azodicarbonamide.

[0012] Preferably, the compatibilizer is KH-550 grafted EPDM.

[0013] Preferably, the silica is selected from any one or more of nano silica and precipitated silica.

[0014] A method for preparing the corrosion-resistant high-strength aerator membrane comprises the following steps:

[0015] (1) premixing a silane coupling agent, white carbon black, and multi-walled carbon nanotubes to obtain a pretreated filler;

[0016] (2) placing the modified EPDM rubber, fluororubber and compatibilizer in an internal mixer at 90-95° C. and mixing at a speed of 60-65 rpm, then raising the temperature of the internal mixer to 110° C., adding the pretreated filler obtained in step (1) and continuing to mix for 10 minutes, then raising the temperature of the internal mixer to 120° C., adding the aramid fiber, and mixing at a speed of 80 rpm for 5 minutes;

[0017] (3) After the mixing is completed, the temperature of the internal mixer is lowered to 80°C, and diisopropylbenzene peroxide, triallyl isocyanurate, 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine, silver-loaded zeolite, stearic acid, and zinc oxide are added and mixed. When the temperature of the internal mixer is lowered to 50°C, azodicarbonamide is added and mixed at a speed of 30 rpm to obtain a rubber compound;

[0018] (4) placing the obtained rubber compound in a mold cavity at 80°C for the first stage vulcanization, closing the mold, applying a pressure of 5 MPa through a flat vulcanizer, and maintaining the temperature at 100°C for 30 minutes; after the first stage vulcanization is completed, the second stage vulcanization and the third stage vulcanization are carried out in sequence. After the vulcanization is completed, the product is taken out of the mold and placed in an oven for static vulcanization;

[0019] (5) The vulcanized product is fixed on a laser processing workbench and punched using an ultraviolet laser with a wavelength of 355 nm. After the punching is completed, the membrane surface is cleaned with plasma, sprayed with a PTFE nano-coating, and then sintered to obtain a corrosion-resistant and high-strength aerator membrane.

[0020] Preferably, in step (4), the vulcanization temperature is rapidly increased to 160° C., and the pressure is simultaneously increased to 8 MPa for the second stage vulcanization, which is continued for 15 minutes. After the second stage vulcanization is completed, the temperature is further increased to 180° C., and the pressure is increased to 12 MPa for the third stage vulcanization, which is continued for 25 minutes.

[0021] Preferably, in step (5), the ultraviolet laser power is 15-20 W, the scanning speed is 200-300 mm / s, the pulse frequency is 50-100 kHz, the aperture is controlled at 0.2±0.02 mm, and the pressure of the auxiliary gas is adjusted to 0.8-1.2 MPa.

[0022] Preferably, in step (5), the sintering and curing is carried out at 380° C. for 20 to 25 minutes.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) The present invention forms a dynamic balance of "cross-linked network curing-stable bubble core expansion" by matching the timing of the high-temperature vulcanization stage with the decomposition process of azodicarbonamide, making the material porosity exceed 80%, achieving precise regulation and uniformity control of the microporous structure;

[0025] 2) The EPDM / FKM blend system of the present invention forms a molecular-level interpenetrating network structure through directional regulation of the compatibilizer, making the material resistant to corrosive environments and breaking through the application bottleneck of traditional rubber materials in complex chemical media;

[0026] 3) The surface hydroxyl groups of the nano-silica in the present invention form chemical crosslinks with the rubber molecular chains, providing strong interface reinforcement; the one-dimensional tubular structure of the carbon nanotubes is embedded in the rubber matrix to construct a tear-resistant stress conduction network; and the high-strength skeleton effect of the aramid fiber inhibits fatigue crack propagation. The synergistic effect of the three improves the tensile strength, tear strength, and fatigue life of the composite material, with the tensile strength reaching 30.2 MPa and the tear strength reaching 68.5 kN / m, achieving a multiplier effect on mechanical properties;

[0027] 4) The preparation process of the present invention achieves breakthroughs in the performance of aerator membranes in multiple dimensions, such as mechanical strength, corrosion resistance, and aeration efficiency, through multi-material compounding (EPDM / FKM blending, nanofiller / fiber reinforcement), precise process control (staged mixing, synchronous foaming and cross-linking), and functional design (corrosion resistance, antibacterial, and low energy consumption). It is particularly suitable for long-term stable operation under complex working conditions and has significant industrial application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a physical picture of the aerator membrane prepared in Example 4 installed in the aerator. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described below in conjunction with specific examples. In the following examples, unless otherwise specified, the technical means used are conventional means well known to those skilled in the art. In the examples, if specific conditions are not specified, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not specified by the manufacturer, and are all conventional products that can be purchased commercially.

[0030] The main raw materials used in the following examples are all commercially available products. The commercial model of modified EPDM is Keltan 5470C (ethylene content 70%, ENB content 4.5%); the commercial model of fluororubber is Viton A-401C; the commercial model of KH-550 grafted EPDM is Admer QF551 (maleic anhydride grafting rate 1.2%); the specific surface area of nano-silica is 200m 2 / g; the specific surface area of precipitated silica is 180-200m 2 / g; the specification of the multi-walled carbon nanotubes is L1.5μm / Φ9.5nm; the commercially available model of the aramid fiber is Kevlar 1F361 (silane pre-coated short fibers, length 3mm); the silver ion loading in the silver-loaded zeolite is 3%.

[0031] Example 1

[0032] A method for preparing a corrosion-resistant high-strength aerator membrane comprises the following steps:

[0033] (1) 1.5 parts by mass of KH-550 silane coupling agent, 20 parts by mass of nano-silica and 3 parts by mass of multi-walled carbon nanotubes were premixed at 80°C for 10 minutes to obtain a pretreated filler; 65 parts by mass of modified EPDM rubber, 30 parts by mass of fluororubber and 5 parts by mass of KH-550 grafted EPDM were placed in an internal mixer at 90°C, mixed at a speed of 60 rpm for 5 minutes, and then the temperature of the internal mixer was increased to 110°C, and the pretreated filler was added, and the mixture was mixed at a speed of 70 rpm for 10 minutes. After that, the temperature of the internal mixer was increased to 120°C, 5 parts by mass of aramid fiber were added, and the mixture was mixed at a speed of 80 rpm for 5 minutes;

[0034] (2) After the mixing in step (1) is completed, the temperature of the internal mixer is lowered to 80° C., and the speed is set to 60 rpm. 2.5 parts by mass of diisopropylbenzene peroxide, 1 part by mass of triallyl isocyanurate, 1.5 parts by mass of 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine, 4 parts by mass of silver-loaded zeolite, 1 part by mass of stearic acid, and 2 parts by mass of zinc oxide are added and mixed for 5 minutes. When the temperature of the internal mixer is lowered to 50° C., 3 parts by mass of azodicarbonamide are slowly added and mixed at a speed of 30 rpm for 3 minutes to obtain a rubber compound;

[0035] (3) Preheat the upper and lower heating plates of the flat-plate vulcanizer to the first-stage vulcanization temperature of 80°C in advance, and evenly apply PTFE release agent on the mold surface to avoid adhesion of the material to the mold after vulcanization. Quickly transfer the mixed rubber obtained in step (2) to the preheated mold cavity for the first-stage vulcanization, close the mold, apply a pressure of 5MPa through the flat-plate vulcanizer, and maintain it at 100°C for 30min; after the first-stage vulcanization is completed, quickly increase the vulcanization temperature to 160°C, and at the same time increase the pressure to 8MPa for the second-stage vulcanization, and continue vulcanization for 15min; after the second-stage vulcanization is completed, further increase the temperature to 180°C, increase the pressure to 12MPa for the third-stage vulcanization, and continue vulcanization for 25min; after the vulcanization is completed, remove the product from the mold and place it in a 200°C oven for static vulcanization for 4h;

[0036] (4) Fix the vulcanized product on a laser processing workbench and use a UV laser with a wavelength of 355 nm to punch holes. The power of the UV laser is 15-20 W, the scanning speed is 200-300 mm / s, the pulse frequency is 50-100 kHz, and the aperture is controlled at 0.2±0.02 mm. At the same time, the pressure of the auxiliary gas (compressed air) is adjusted to 0.8-1.2 MPa. The UV laser scans the surface of the product according to the preset parameters, and the high energy density of the laser is used to instantly vaporize the material to form aeration holes.

[0037] (5) After the drilling is completed, the membrane surface is cleaned for 5 minutes using a plasma with a power of 200W and an Ar / O2 mixed gas, and then a PTFE nano-coating with a thickness of 15 μm is sprayed. After sintering and curing at 380 °C for 20 minutes, a 10 μm dense coating is formed to obtain a corrosion-resistant and high-strength aerator membrane.

[0038] Example 2

[0039] When preparing a corrosion-resistant and high-strength aerator membrane, 50 parts by mass of modified EPDM rubber, 45 parts by mass of fluororubber, and 5 parts by mass of KH-550 grafted EPDM in step 1) are placed in an internal mixer and mixed; the remaining preparation methods and parameters are the same as those in Example 1 to obtain a corrosion-resistant and high-strength aerator membrane.

[0040] Example 3

[0041] When preparing a corrosion-resistant and high-strength aerator membrane, in step 1), 1.5 parts by mass of KH-550 silane coupling agent, 15 parts by mass of nano-silica, 5 parts by mass of precipitated silica, and 1.5 parts by mass of multi-walled carbon nanotubes are premixed to obtain a pretreated filler; the remaining preparation methods and parameters are the same as those in Example 1, and a corrosion-resistant and high-strength aerator membrane is obtained.

[0042] Example 4

[0043] When preparing the corrosion-resistant high-strength aerator membrane, the specific preparation process of step 1) is as follows: 1.5 parts by mass of KH-550 silane coupling agent, 25 parts by mass of nano-silica and 5 parts by mass of multi-walled carbon nanotubes are premixed at 80°C for 10 minutes to obtain a pretreated filler; 60 parts by mass of modified EPDM rubber, 35 parts by mass of fluororubber and 5 parts by mass of KH-550 grafted EPDM are placed in a 90°C internal mixer and mixed at a speed of 60 rpm for 5 minutes. When the temperature of the internal mixer is increased to 110°C, the pretreated filler is added and mixed at a speed of 70 rpm for 10 minutes. When the temperature of the internal mixer is increased to 120°C, 8 parts by mass of aramid fiber are added and mixed at a speed of 80 rpm for 5 minutes. The rest of the preparation method and parameters are the same as those in Example 1 to obtain a corrosion-resistant high-strength aerator membrane. Figure 1 shown.

[0044] Example 5

[0045] When preparing the corrosion-resistant high-strength aerator membrane, the specific preparation process of step 1) is as follows: 1.5 parts by mass of KH-550 silane coupling agent, 15 parts by mass of nano-silica and 1.5 parts by mass of multi-walled carbon nanotubes are premixed at 80° C. for 10 minutes to obtain a pretreated filler; 70 parts by mass of modified EPDM rubber, 25 parts by mass of fluororubber and 5 parts by mass of KH-550 grafted EPDM are placed in an internal mixer at 90° C. and mixed at a speed of 60 rpm for 5 minutes. When the temperature of the internal mixer is increased to 110° C., the pretreated filler is added and mixed at a speed of 70 rpm for 10 minutes. When the temperature of the internal mixer is increased to 120° C., 3 parts by mass of aramid fiber are added and mixed at a speed of 80 rpm for 5 minutes. The remaining preparation methods and parameters are the same as those in Example 1 to obtain a corrosion-resistant high-strength aerator membrane.

[0046] Example 6

[0047] To prepare a corrosion-resistant, high-strength aerator membrane, 40 parts by mass of modified EPDM rubber, 55 parts by mass of fluororubber, and 5 parts by mass of KH-550 grafted EPDM were placed in an internal mixer in step 1); and 2 parts by mass of azodicarbonamide were added in step 2). The remaining preparation method and parameters were the same as in Example 1, resulting in a corrosion-resistant, high-strength aerator membrane.

[0048] Example 7

[0049] When preparing a corrosion-resistant and high-strength aerator membrane, 60 parts by mass of modified EPDM rubber, 30 parts by mass of fluororubber, and 10 parts by mass of KH-550 grafted EPDM in step 1) are placed in an internal mixer; the remaining preparation methods and parameters are the same as those in Example 1 to obtain a corrosion-resistant and high-strength aerator membrane.

[0050] Comparative Example 1

[0051] When preparing the aerator membrane, in step 1), nano-silica and multi-walled carbon nanotubes are directly premixed to obtain a pretreated filler. The remaining preparation methods and parameters are the same as those in Example 1 to obtain the aerator membrane.

[0052] Comparative Example 2

[0053] When preparing the aerator membrane, only 70 parts by mass of modified EPDM rubber and 30 parts by mass of fluororubber were used in step 1), and KH-550 grafted EPDM was not added. The remaining preparation methods and parameters were the same as in Example 1 to obtain the aerator membrane.

[0054] Comparative Example 3

[0055] When preparing the aerator membrane, the rubber material obtained in step 3) is subjected to only one stage of vulcanization treatment. A pressure of 8 MPa is applied to a flat vulcanizer. After vulcanization at 130°C for 30 minutes, the vulcanized product is directly punched. The remaining preparation methods and parameters are the same as those in Example 1 to obtain an aerator membrane.

[0056] Comparative Example 4

[0057] When preparing the aerator membrane, in step 2), 3 parts by mass of azodicarbonamide were replaced with 5 parts by mass of ammonium bicarbonate. The remaining preparation methods and parameters were the same as those in Example 1 to obtain the aerator membrane.

[0058] Comparative Example 5

[0059] When preparing the aerator membrane, the specific preparation process of step 1) is as follows: 70 parts by mass of modified EPDM rubber, 25 parts by mass of fluororubber and 5 parts by mass of KH-550 grafted EPDM are placed in an internal mixer at 90°C and mixed at a speed of 60 rpm for 5 minutes. When the temperature of the internal mixer is increased to 110°C, 20 parts by mass of nano-silica are added and mixed at a speed of 70 rpm for 10 minutes. When the temperature of the internal mixer is increased to 120°C, 5 parts by mass of aramid fiber are added and mixed at a speed of 80 rpm for 5 minutes. The remaining preparation methods and parameters are the same as those in Example 1 to obtain an aerator membrane.

[0060] Example 8

[0061] Performance characterization tests were conducted on the aerator membranes prepared in Examples 1-7 and Comparative Examples 1-5, and the results are shown in Table 3. The tensile strength test was conducted in accordance with ASTM D412-22; the tear strength test was conducted in accordance with ASTM D624; the hardness test was conducted in accordance with ASTM D2240; the corrosion resistance test (30-day volume change rate) was conducted in accordance with ASTM D471; and the porosity test was calculated using micro-CT scanning. The dynamic fatigue life test process involved using a dynamic fatigue testing machine, simulating a membrane operating pressure of 0.1 MPa, and a cycle frequency of 1-2 Hz. The cycles were repeated until the membrane ruptured or the porosity decreased by >5%. The number of cycles until failure was recorded as the dynamic fatigue life.

[0062] Table 3 Aerator membrane performance test results

[0063]

[0064] As can be seen from Table 1, the aerator membrane prepared in this application has sufficient strength while ensuring excellent corrosion resistance, can meet the needs of various complex application scenarios, improve the overall performance and service life of the aerator, and reduce equipment maintenance costs.

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A corrosion-resistant high-strength aerator membrane, characterized in that: The invention is composed of the following raw materials in parts by mass: 1-3 parts of silane coupling agent, 15-25 parts of white carbon black, 1-5 parts of multi-walled carbon nanotubes, 40-70 parts of modified EPDM rubber, 25-55 parts of fluororubber, 5-10 parts of compatibilizer, 2-8 parts of aramid fiber, 1-3 parts of dicumyl peroxide, 1-2 parts of triallyl isocyanurate, 1-2 parts of 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine, 3-5 parts of silver-loaded zeolite, 1-3 parts of stearic acid, 1-3 parts of zinc oxide and 2-3 parts of azodicarbonamide.

2. The corrosion-resistant high-strength aerator membrane according to claim 1, characterized in that: The invention is composed of the following raw materials in parts by mass: 1-2 parts of silane coupling agent, 15-25 parts of white carbon black, 2-5 parts of multi-walled carbon nanotubes, 40-60 parts of modified EPDM rubber, 30-55 parts of fluororubber, 5-10 parts of compatibilizer, 2-8 parts of aramid fiber, 2-3 parts of dicumyl peroxide, 1-2 parts of triallyl isocyanurate, 1-2 parts of 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine, 3-4 parts of silver-loaded zeolite, 1-2 parts of stearic acid, 1-2 parts of zinc oxide and 2-3 parts of azodicarbonamide.

3. The corrosion-resistant high-strength aerator membrane according to claim 2, characterized in that: The invention is composed of the following raw materials in parts by mass: 1.5 parts of silane coupling agent, 20-25 parts of white carbon black, 3-5 parts of multi-walled carbon nanotubes, 50-65 parts of modified EPDM rubber, 30-45 parts of fluororubber, 5 parts of compatibilizer, 2-5 parts of aramid fiber, 2-3 parts of dicumyl peroxide, 1-2 parts of triallyl isocyanurate, 1-2 parts of 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine, 3-4 parts of silver-loaded zeolite, 1-2 parts of stearic acid, 1-2 parts of zinc oxide and 2-3 parts of azodicarbonamide.

4. The corrosion-resistant and high-strength aerator membrane according to claim 3, characterized in that: The invention is composed of the following raw materials in parts by mass: 1.5 parts of silane coupling agent, 20 parts of white carbon black, 3 parts of multi-walled carbon nanotubes, 65 parts of modified EPDM rubber, 30 parts of fluororubber, 5 parts of compatibilizer, 5 parts of aramid fiber, 2-3 parts of dicumyl peroxide, 1 part of triallyl isocyanurate, 1-2 parts of 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine, 4 parts of silver-loaded zeolite, 1 part of stearic acid, 2 parts of zinc oxide and 3 parts of azodicarbonamide.

5. The corrosion-resistant and high-strength aerator membrane according to claim 1, characterized in that: The compatibilizer is KH-550 grafted EPDM.

6. The corrosion-resistant and high-strength aerator membrane according to claim 1, characterized in that: The white carbon black is selected from any one or more of nano white carbon black and precipitated white carbon black.

7. A method for preparing the corrosion-resistant high-strength aerator membrane according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) premixing a silane coupling agent, white carbon black, and multi-walled carbon nanotubes to obtain a pretreated filler; (2) placing the modified EPDM rubber, fluororubber and compatibilizer in an internal mixer at 90-95° C. and mixing at a speed of 60-65 rpm, then raising the temperature of the internal mixer to 110° C., adding the pretreated filler obtained in step (1) and continuing to mix for 10 minutes, then raising the temperature of the internal mixer to 120° C., adding the aramid fiber, and mixing at a speed of 80 rpm for 5 minutes; (3) After the mixing is completed, the temperature of the internal mixer is lowered to 80°C, and diisopropylbenzene peroxide, triallyl isocyanurate, 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine, silver-loaded zeolite, stearic acid, and zinc oxide are added and mixed. When the temperature of the internal mixer is lowered to 50°C, azodicarbonamide is added and mixed at a speed of 30 rpm to obtain a rubber compound; (4) placing the obtained rubber compound in a mold cavity at 80°C for the first stage vulcanization, closing the mold, applying a pressure of 5 MPa through a flat vulcanizer, and maintaining the temperature at 100°C for 30 minutes; after the first stage vulcanization is completed, the second stage vulcanization and the third stage vulcanization are carried out in sequence. After the vulcanization is completed, the product is taken out of the mold and placed in an oven for static vulcanization; (5) The vulcanized product is fixed on a laser processing workbench and punched using an ultraviolet laser with a wavelength of 355 nm. After the punching is completed, the membrane surface is cleaned with plasma, sprayed with a PTFE nano-coating, and then sintered to obtain a corrosion-resistant and high-strength aerator membrane.

8. The method for preparing the corrosion-resistant high-strength aerator membrane according to claim 7, characterized in that: In the step (4), the vulcanization temperature is rapidly increased to 160° C., and the pressure is simultaneously increased to 8 MPa for the second stage vulcanization, which is continued for 15 minutes. After the second stage vulcanization is completed, the temperature is further increased to 180° C., and the pressure is increased to 12 MPa for the third stage vulcanization, which is continued for 25 minutes.

9. The method for preparing the corrosion-resistant high-strength aerator membrane according to claim 7, characterized in that: In the step (5), the power of the ultraviolet laser is 15-20 W, the scanning speed is 200-300 mm / s, the pulse frequency is 50-100 kHz, the aperture is controlled at 0.2±0.02 mm, and the pressure of the auxiliary gas is adjusted to 0.8-1.2 MPa.

10. The method for preparing the corrosion-resistant high-strength aerator membrane according to claim 7, characterized in that: In the step (5), the sintering and curing is carried out at 380° C. for 20 to 25 minutes.

Images