Antioxidant high filtration efficiency micro-nano structure m-psa / pps composite filter felt and preparation method thereof

Abstract

The application belongs to the technical field of filter materials, and particularly relates to an oxidation-resistant high-filtration-efficiency micro-nano structure M-PSA / PPS composite filter felt and a preparation method thereof. The application comprises the following steps: (1) PSA nanofiber membrane preparation: adding DMAC into PSA spinning solution to obtain PSA spinning solution; adding the PSA spinning solution into an injection pump of an electrostatic spinning device to perform electrostatic spinning, and drying to remove solvent to obtain a PSA nanofiber membrane; (2) M-PPS filter material preparation: performing ultrasonic cleaning on PPS needle punching filter felt, drying, then spraying silicon sol on the front and back surfaces of the PPS needle punching filter felt, standing, flushing, and drying to obtain M-PPS filter material; (3) laying the PSA nanofiber membrane on the silicon sol modified PPS filter material, performing compounding by using a roller to extrude, then standing, and placing in an oven to dry, and the oxidation-resistant high-filtration-efficiency micro-nano structure M-PSA / PPS composite filter felt is obtained. The application makes up for the performance deficiency of the PPS needle punching filter felt, and improves the filtration performance and oxidation resistance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of filter materials, and particularly relates to an oxidation-resistant high-filtration-efficiency micro-nano-structure M-PSA / PPS composite filter felt and a preparation method thereof. BACKGROUND

[0002] At present, bag-type dust collectors used in industrial dust removal mainly use filter bags for flue dust purification. Most of the filter bags are composite structures combined with needle punching and weaving. The middle layer is based on woven fabric, and the upper and lower layers are formed into three-dimensional structure filter layers by using needle punching, water jetting and other non-woven technologies. The fibers of the filter material are mainly micron-level fibers. For fine particulate matter, higher filtration efficiency needs to be achieved by post-processing such as film coating and impregnation. With the increasing environmental protection efforts in China, the emission standard is becoming increasingly stringent. In order to improve the filtration precision of polyphenylene sulfide (PPS) needle punching composite felt and reduce the post-processing process, the polyphenylene sulfide (PPS) needle punching felt is hot-pressed with the poly sulfone amide (PSA) nanofiber membrane prepared by electrospinning to form a poly sulfone amide / polyphenylene sulfide (PSA / PPS) composite filter material with micro-nano structure, which can achieve higher dust removal efficiency.

[0003] In addition, PPS has poor oxidation resistance and cannot be used in a flue dust environment with an oxygen content greater than 15% for a long time, which seriously restricts the application range of PPS fibers. SUMMARY

[0004] To solve the above technical problems, the application provides an oxidation-resistant high-filtration-efficiency micro-nano-structure M-PSA / PPS composite filter felt, which makes up for the performance deficiency of PPS needle punching filter felt and improves the filtration performance and oxidation resistance.

[0005] The preparation method of the oxidation-resistant high-filtration-efficiency micro-nano-structure M-PSA / PPS composite filter felt provided by the application comprises the following steps:

[0006] (1) PSA nanofiber membrane preparation: DMAC is added to PSA spinning solution to obtain PSA spinning solution; the PSA spinning solution is added to the injection pump of an electrospinning device for electrospinning, and PSA nanofiber membrane is obtained after drying and removing the solvent;

[0007] (2) M-PPS filter material preparation: the PPS needle punching filter felt is ultrasonically cleaned and then dried, then silica sol is sprayed on the front and back surfaces of the PPS needle punching filter felt, and the PPS needle punching filter felt modified by the silica sol, i.e., M-PPS filter material, is obtained after standing, rinsing and drying;

[0008] (3) The PSA nanofiber membrane is laid on the M-PPS filter material, the surface wrinkles are removed by applying tension to the four sides, and then the PSA nanofiber membrane is compounded with the M-PPS filter material by using a roller for extrusion, and then the compound is left to stand and dried in an oven.

[0009] Preferably, the mass concentration of PSA in the PSA spinning solution is 8wt.% to 12wt.%.

[0010] Preferably, in step (1), the electrospinning parameters are: spinning distance 15 to 25 cm; voltage 15 to 30 kV; injection pump advancing rate 0.1 to 0.3 mL / h; and spinning solution amount 0.5 to 1.5 mL.

[0011] Preferably, in step (1), the rotating speed of the drum of the electrospinning equipment is 300 to 400 rpm / min, the ambient temperature is 17 to 23℃, and the ambient humidity is 28 to 32%.

[0012] Preferably, the drying is performed under vacuum, the drying time is 12 h, and the drying temperature is 60℃.

[0013] Preferably, the PPS needle-punched filter felt has a grammage of 500 to 700 g / m 2 .

[0014] Preferably, the mass fraction of silicon dioxide in the silica sol is 10wt.% to 30wt.%.

[0015] Preferably, in steps (2) and (3), the standing time is 0.5 h, the drying time is 8 h, and the drying temperature is 60℃.

[0016] Preferably, in step (3), the roller pressure is 2 to 8 kPa.

[0017] The preparation method of the high-filtration-efficiency micro-nano structure M-PSA / PPS composite filter felt with antioxidant property, according to the present application, comprises the following steps:

[0018] (1) PSA nanofiber membrane preparation: adding DMAC to PSA spinning stock solution with a solid content of 12.5wt.% and then magnetically stirring at room temperature for 12 h to mix uniformly, standing until the bubbles are completely eliminated, to obtain PSA spinning solution; adding the PSA spinning solution into the injection pump of the electrospinning equipment to perform electrospinning, and then placing in a vacuum drying oven for drying, to remove the solvent after drying, to obtain PSA nanofiber membrane;

[0019] (2) M-PPS filter material preparation: after ultrasonic cleaning to remove surface dust and impurities, drying the PPS needle-punched filter felt for standby, then uniformly spraying silica sol on the front and back surfaces of the PPS needle-punched filter felt, standing, washing with deionized water, and drying, to obtain M-PPS filter material;

[0020] (3) laying the PSA nanofiber membrane on the M-PPS filter material, applying pressure with a roller for compounding, and under the adhesion of the silica sol, the PSA nanofiber membrane and the M-PPS filter material are tightly adhered, and after standing, placing in an oven for drying treatment, to obtain the high-filtration-efficiency micro-nano structure M-PSA / PPS composite filter felt with antioxidant property.

[0021] The application also provides the high-filtration-efficiency micro-nano structure M-PSA / PPS composite filter felt with the antioxidant property prepared by the preparation method.

[0022] The application improves the defects of the PPS needle felt filter material by the surface coating process with the good thermal stability and the antioxidant property of the silicon dioxide, and prepares the M-PSA / PPS composite filter felt by the adhesive effect of the nano silicon sol.

[0023] The application prepares the micro-nano structure composite filter material with the good antioxidant property based on the super-high filtration efficiency filter layer formed by the nano fibers. The PPS filter felt is modified by the nano silicon sol to improve the antioxidant property, the composite filter felt is prepared by the adhesive effect of the silicon sol and the PSA nano fiber membrane, the PPS fiber surface is coated with the uniform nano silicon coating, the coating can play a protective role and can effectively prevent the oxidation and corrosion of nitric acid, and the composite of the PSA nano fiber membrane can significantly reduce the pore size and the air permeability of the PPS filter felt. The composite structure of the application can improve the filtration efficiency and slightly increase the filtration resistance compared with the PPS filter material, and realizes the high efficiency and low resistance.

[0024] Compared with the prior art, the application has the beneficial effects that:

[0025] 1. The PSA nano fiber membrane greatly improves the filtration performance of the PPS filter felt, the pore size and the air permeability are reduced, and the mechanical property and the thermal stability are slightly improved.

[0026] 2. The application improves the thermal stability and the antioxidant property of the PPS filter felt.

[0027] 3. The application can improve the filtration efficiency and slightly increase the filtration resistance compared with the PPS filter felt, realizes the high efficiency and low resistance of the dust removal filter material, effectively improves the filtration precision of the polyphenylene sulfide (PPS) needle felt, improves the performance of the original material, improves the filtration performance and the antioxidant property of the existing material, and forms a new M-PSA / PPS composite filter felt, which can be applied to the filtration field with high temperature and high oxygen content. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Fig. 1 is the SEM diagram of the PPS needle filter felt and the M-PPS filter material in examples 1-3, wherein (a) is the PPS needle filter felt used in examples 1-3, (b) is the M-PPS filter material of example 3, (c) is the M-PPS filter material of example 2, and (d) is the M-PPS filter material of example 1.

[0029] Figure 2 Fig. 2 is the element distribution diagram of the M-PSA / PPS composite filter felt prepared in example 1.

[0030] Figure 3 is a stress-strain curve of PPS needle-punched filter felt and M-PPS filter material in Example 1;

[0031] Figure 4 is a Young's modulus broken line graph of PPS needle-punched filter felt and M-PPS filter material in Example 1;

[0032] Figure 5 is a tensile strength retention rate comparison column graph of PPS needle-punched filter felt and M-PPS filter material in Example 1, wherein A all represents PPS needle-punched filter felt, and B all represents M-PPS filter material;

[0033] Figure 6 is a real object graph of PPS needle-punched filter felt, M-PPS filter material and after nitric acid treatment in Example 1, wherein (a) is a real object graph of PPS needle-punched filter felt, and (b) is a real object graph of M-PPS filter material;

[0034] Figure 7 is a pore size change graph of PPS needle-punched filter felt, M-PPS filter material and M-PSA / PPS composite filter felt in Example 1;

[0035] Figure 8 is a gas permeability performance graph of PPS needle-punched filter felt, M-PPS filter material and M-PSA / PPS composite filter felt in Example 1;

[0036] Figure 9 is a filtration performance broken line graph of PPS needle-punched filter felt, M-PPS filter material and M-PSA / PPS composite filter felt under two kinds of aerosol particles in Example 1, wherein the upper graph and the lower graph correspond to DEHS particles and NaCl particles in turn;

[0037] Figure 10 is a comprehensive filtration efficiency and resistance column graph of PPS needle-punched filter felt, M-PPS filter material and M-PSA / PPS composite filter felt in Example 1, wherein the upper graph and the lower graph correspond to DEHS particles and NaCl particles in turn;

[0038] Figure 11 is a quality factor column graph of PPS needle-punched filter felt, M-PPS filter material and M-PSA / PPS composite filter felt in Example 1, wherein the upper graph and the lower graph correspond to DEHS particles and NaCl particles in turn;

[0039] In the figure, 1 is a stress-strain curve of PPS needle-punched filter felt without nitric acid treatment;

[0040] 2 is a stress-strain curve of PPS needle-punched filter felt treated with nitric acid for 24 hours;

[0041] 3 is a stress-strain curve of PPS needle-punched filter felt treated with nitric acid for 48 hours;

[0042] 4 is the stress-strain curve of M-PPS filter material without nitric acid treatment;

[0043] 5 is the stress-strain curve of M-PPS filter material treated with nitric acid for 24 h;

[0044] 6 is the stress-strain curve of M-PPS filter material treated with nitric acid for 48 h;

[0045] 7 is the PPS needle-punched filter felt Young's modulus broken line;

[0046] 8 is the M-PPS filter material Young's modulus broken line. DETAILED DESCRIPTION

[0047] The technical solutions of the present application will be described clearly and completely in combination with the drawings and examples.

[0048] All raw materials used in the examples are commercially available, except for special instructions. Among them, the PPS needle-punched filter felt used in Examples 1-3 all have a grammage of 600 g / m 2 .

[0049] Example 1

[0050] (1) Preparation of PSA nanofiber membrane: DMAC was added to PSA spinning dope with a solid content of 12.5 wt.%, then magnetically stirred at room temperature for 12 h to mix uniformly, and left to stand until the bubbles were completely eliminated, obtaining PSA spinning solution with a mass concentration of 10 wt.%; the PSA spinning solution was added to the injection pump of the electrospinning equipment for electrospinning, and then placed in a vacuum drying oven at 60℃ for 12 h to dry; after drying to remove the solvent, the PSA nanofiber membrane was obtained;

[0051] The electrospinning parameters were as follows: spinning distance 20 cm; voltage 25 kV; injection pump pushing rate 0.2 mL / h; spinning solution volume 1 mL;

[0052] The roller speed of the electrospinning equipment was 300 rpm / min, the environmental temperature was 20℃, and the environmental humidity was 30%.

[0053] (2) Preparation of modified PPS filter material: after ultrasonic cleaning to remove surface dust and impurities, the PPS needle-punched filter felt was dried for standby, then silica sol with a mass fraction of 30 wt.% was uniformly sprayed on the front and back of the PPS needle-punched filter felt, left to stand for 0.5 h, washed with deionized water, and then treated at 60℃ for 8 h to dry, obtaining M-PPS filter material;

[0054] (3) The PSA nanofiber membrane is laid on the M-PPS filter material, a pulling force is applied to the four sides to remove the surface wrinkles, and a roller is used for extrusion to perform compounding. Under the adhesion of the silica sol, the PSA nanofiber membrane is tightly bonded to the M-PPS filter material. After standing for 0.5 h, the PSA nanofiber membrane is placed in an oven for drying treatment at 60°C for 8 h, and the PSA nanofiber membrane is obtained.

[0055] Example 2

[0056] (1) PSA nanofiber membrane preparation: DMAC is added to PSA spinning dope with a solid content of 12.5 wt.%, and then the mixture is uniformly stirred at room temperature for 12 h. After standing until the bubbles are completely eliminated, PSA spinning solution with a PSA mass concentration of 8 wt.% is obtained. The PSA spinning solution is added to the injection pump of the electrospinning equipment for electrospinning, and then placed in a vacuum drying oven for drying at 60°C for 12 h. After drying to remove the solvent, the PSA nanofiber membrane is obtained.

[0057] The electrospinning parameters are as follows: spinning distance 15 cm; voltage 15 kV; injection pump pushing rate 0.1 mL / h; and spinning solution amount 0.5 mL.

[0058] The rotating speed of the drum of the electrospinning equipment is 300 rpm / min, the ambient temperature is 17°C, and the ambient humidity is 28%.

[0059] (2) M-PPS filter material preparation: The PPS needle punched filter felt is ultrasonically cleaned to remove surface dust and impurities, and then dried for standby. Then, silica sol with a silica mass fraction of 20 wt.% is uniformly sprayed on the front and back of the PPS needle punched filter felt. After standing for 0.5 h, the PPS needle punched filter felt is washed with deionized water and then dried at 60°C for 8 h to obtain the M-PPS filter material.

[0060] (3) The PSA nanofiber membrane is laid on the M-PPS filter material, a pulling force is applied to the four sides to remove the surface wrinkles, and a roller is used for extrusion to perform compounding. Under the adhesion of the silica sol, the PSA nanofiber membrane is tightly bonded to the M-PPS filter material. After standing for 0.5 h, the PSA nanofiber membrane is placed in an oven for drying treatment at 60°C for 8 h, and the PSA nanofiber membrane is obtained.

[0061] Example 3

[0062] (1) PSA nanofiber membrane preparation: DMAC is added to PSA spinning dope with a solid content of 12.5 wt.%, and then the mixture is uniformly stirred at room temperature for 12 h. After standing until the bubbles are completely eliminated, PSA spinning solution with a PSA mass concentration of 8 wt.% is obtained. The PSA spinning solution is added to the injection pump of the electrospinning equipment for electrospinning, and then placed in a vacuum drying oven for drying at 60°C for 12 h. After drying to remove the solvent, the PSA nanofiber membrane is obtained.

[0063] Electrospinning parameters: spinning distance 25 cm; voltage 30 kV; injection pump pushing rate 0.3 mL / h; spinning solution volume 1.5 mL;

[0064] The drum rotation speed of the electrospinning equipment was 400 rpm / min, the ambient temperature was 23°C, and the ambient humidity was 32%.

[0065] (2) Preparation of modified PPS filter material: after ultrasonic cleaning to remove surface dust and impurities, the PPS needle punched filter felt was dried for standby use. Then, silica sol with a silica mass fraction of 10 wt.% was uniformly sprayed on the front and back of the PPS needle punched filter felt, and was left to stand for 0.5 h. After washing with deionized water, the PPS needle punched filter felt was dried at 60°C for 8 h to obtain M-PPS filter material.

[0066] (3) The PSA nanofiber membrane was laid on the M-PPS filter material, and a pulling force was applied to the four sides to remove surface wrinkles. The PSA nanofiber membrane and the M-PPS filter material were tightly bonded under the adhesion of the silica sol, and were left to stand for 0.5 h before being placed in an oven for drying at 60°C for 8 h.

[0067] Performance test

[0068] 1. Fiber morphology analysis: the PPS needle punched filter felt used in Examples 1-3 and the M-PPS filter material obtained in Examples 1-3 were subjected to SEM analysis to observe the surface micro-morphology thereof, as shown in Figure 1 ;

[0069] Figure 1 It can be seen that with the increase of the silica sol mass fraction, the PPS fibers are more completely wrapped by the coating agent, and the coating effect is better.

[0070] Further research on the bonding strength of the silica sol coating and the PPS fibers showed that after being blown by air flow of 0.08 m / s for 5 h, the mass loss of the M-PPS filter material of Example 1 was only 0.2%, and the bonding strength of the silica sol coating with a silica mass fraction of 30 wt.% and the PPS fibers was better, which indicated that the bonding strength of the silica sol coating and the PPS fibers increased with the increase of the silica mass fraction.

[0071] 2. Chemical element analysis: the M-PSA / PPS composite filter felt obtained in Example 1 was subjected to element distribution analysis by EDS, and the analysis results are shown in Figure 2 ;

[0072] Figure 2 It is shown that after the PPS needle punched filter felt is modified by the silica sol, a new silicon element distribution appears on the surface of the PPS needle punched filter felt. Figure 2 (a)-(c) in the table are the element distributions of the PPS filter felt itself, which only contains carbon, oxygen, and sulfur. Figure 2The newly added element silicon in (d) indicates that the nano-silicon coating has been successfully coated on the surface of the fiber after modification of the silica sol, which is consistent with the electron microscope results.

[0073] 3. Oxidation resistance performance analysis: The oxidation resistance performance of the filter material was tested according to T / CAEPI 21-2019. The PPS needle-punched filter felt and M-PPS filter material in Example 1 were treated in a 10% nitric acid aqueous solution at a temperature of 93°C for 24h and 48h. The oxidation resistance performance of the material was comprehensively evaluated by changes in mechanical properties.

[0074] Figure 3 Neutralization Figure 4 The stress-strain diagram and Young's modulus of the PPS needle-punched filter felt and M-PPS filter material after 24h and 48h of nitric acid treatment are shown. It can be seen that after modification of the silica sol, the strain of the M-PPS filter material decreases and the modulus increases. As the nitric acid treatment time increases, the modulus of the PPS needle-punched filter felt and M-PPS filter material decreases. After 48h of nitric acid treatment, the Young's modulus of the PPS needle-punched filter felt decreases from the earliest 53.74MPa to 30.77MPa, and the Young's modulus of the M-PPS filter material decreases from 95.99MPa to 80.63MPa. That is, the nano-silicon coating plays a protective role for the fiber in a strong oxidative environment.

[0075] Figure 5 The tensile strength retention rate of the PPS needle-punched filter felt and M-PPS filter material is shown. After 24h and 48h of nitric acid treatment, the strength retention rate of the PPS needle-punched filter felt is 75.1% and 71.8% respectively, and the strength retention rate of the M-PPS filter material is 88% and 86.5% respectively. Obviously, the nano-silicon coating can effectively prevent the oxidation of PPS fiber by nitric acid, significantly improve the oxidation resistance performance of PPS fiber, and prolong the use time of PPS needle-punched filter felt in an oxygen-containing environment.

[0076] Figure 6 The actual photos of the PPS needle-punched filter felt and M-PPS filter material before and after nitric acid treatment are shown. It can be seen that the surface of the sample will discolor after oxidation. After nitric acid treatment, the color of PPS changes significantly, and the color of M-PPS filter material also changes, but the change is smaller. After 48h of nitric acid treatment, the surface of PPS fiber is damaged obviously, becoming rough from smooth. This is because the corrosion and oxidation of nitric acid cause fiber damage. The surface of the fiber of M-PPS filter material is still coated with a nano-silicon coating, and no fiber damage is found. The nano-coating has a certain protective effect on PPS fiber, which is consistent with the oxidation resistance test results.

[0077] 4. Pore size and air permeability analysis: Pore size test was performed using a PSM165 pore size tester; air permeability test was performed using a FX3300 air permeability tester.

[0078] Figure 7、 Figure 8 The pore size change and air permeability of the PPS needle punched filter felt, M-PPS filter material and M-PSA / PPS composite filter felt in Example 1 are shown.

[0079] The pore size from large to small is PPS needle punched filter felt, M-PPS filter material and M-PSA / PPS composite filter felt, and the average pore size is 31.40 μm, 25.01 μm and 10.88 μm, respectively. This shows that the pore size of the PPS needle punched filter felt is slightly reduced after modification by silica sol, and the pore size is obviously reduced after the composite PSA nanofiber membrane. The air permeability and pore size are consistent, and the air permeability of the PPS needle punched filter felt, M-PPS filter material and M-PSA / PPS composite filter felt is 376.4 mm / s, 171.6 mm / s and 109.6 mm / s, respectively.

[0080] 5. Filtration analysis: the PPS needle punched filter felt, M-PPS filter material and M-PSA / PPS composite filter felt in Example 1 are tested by AFC131 filtration performance tester, and the filtration performance is tested under two kinds of aerosol particles (DEHS and NaCl) according to standard GB / T14295-2008, and the results are shown in Figures 9-11 .

[0081] Figures 9-11 It is shown that the M-PSA / PPS composite filter felt has a higher QF value under two kinds of filtration particles, and the QF value is greatly improved compared with PPS, and the composite of the PSA nanofiber membrane effectively improves the filtration efficiency of the filter felt while the resistance increases less.

[0082] In summary, the M-PSA / PPS composite filter felt has better oxidation resistance and also has the advantages of high filtration efficiency and low resistance compared with the pure PPS needle punched filter felt, which greatly improves the shortcomings of the existing PPS filter material. The composite filter felt prepared by combining the surface coating process and the electrospinning process effectively improves the filtration precision of the PPS needle punched felt, and a new type of M-PSA / PPS composite filter felt is formed, which can be applied to the high temperature filtration field, makes up for the performance shortcomings of the existing materials, and improves the filtration performance and oxidation resistance.

Claims

1. A method for preparing an antioxidant, high-efficiency micro / nano-structured M-PSA / PPS composite filter felt, characterized in that, Includes the following steps: (1) Preparation of PSA nanofiber membrane: DMAC was added to the PSA spinning solution to obtain PSA spinning solution; the PSA spinning solution was added to the injection pump of the electrospinning equipment for electrospinning, and the PSA nanofiber membrane was obtained after drying and solvent removal. (2) Preparation of M-PPS filter media: PPS needle-punched filter felt is ultrasonically cleaned and dried. Then, silica sol is sprayed onto the front and back of the PPS needle-punched filter felt, left to stand, rinsed and dried to obtain M-PPS filter media. (3) The PSA nanofiber membrane is laid flat on the silica sol modified PPS filter material, and then compounded by extrusion with rollers. After standing, it is placed in an oven to dry, and the product is obtained.

2. The method for preparing the antioxidant high-efficiency micro / nano structure M-PSA / PPS composite filter felt according to claim 1, characterized in that, The mass concentration of PSA in the PSA spinning solution is 8 wt.% to 12 wt.%.

3. The method for preparing the antioxidant high-efficiency micro / nano structure M-PSA / PPS composite filter felt according to claim 1, characterized in that, In step (1), the electrospinning parameters are: spinning distance 15-25cm; voltage 15-30kV; injection pump feed rate 0.1-0.3mL / h; spinning solution volume 0.5-1.5mL.

4. The method for preparing the antioxidant high-efficiency micro / nano structure M-PSA / PPS composite filter felt according to claim 1, characterized in that, In step (1), the roller speed of the electrospinning equipment is 300-400 rpm / min, the ambient temperature is 17-23℃, and the ambient humidity is 28-32%.

5. The method for preparing the antioxidant high-efficiency micro / nano structure M-PSA / PPS composite filter felt according to claim 1, characterized in that, In step (1), the drying is carried out under vacuum for 12 hours at a temperature of 60°C.

6. The preparation method of the antioxidant high-efficiency micro / nano structure M-PSA / PPS composite filter felt according to claim 1, wherein the PPS needle-punched filter felt has a basis weight of 500-700 g / m³. 2 .

7. The method for preparing the antioxidant high-efficiency micro / nano structure M-PSA / PPS composite filter felt according to claim 1, characterized in that, The silica sol contains 10 wt.% to 30 wt.% silica by mass.

8. The method for preparing the antioxidant high-efficiency micro / nano structure M-PSA / PPS composite filter felt according to claim 1, characterized in that, In steps (2) and (3), the standing time is 0.5h, the drying time is 8h, and the drying temperature is 60℃.

9. An antioxidant, high-efficiency filtration micro / nano structure M-PSA / PPS composite filter felt prepared by the preparation method described in any one of claims 1 to 7.

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