Pps ultrafine fiber composite filter material and preparation method thereof

Abstract

The application relates to the technical field of composite filter materials, in particular to a PPS superfine fiber composite filter material and a preparation method thereof, which comprises the following steps: S1. PPS fibers and glass fibers are put into an opening mixer, uniformly mixed, and then are carded and laid on a multi-layer carding laying machine and are needled and reinforced to obtain a two-layer composite fiber web; S2. the two-layer composite fiber web is dipped in a dipping modification liquid and excess emulsion is squeezed out; S3. the dipped composite fiber web is sintered at high temperature for 3-5 minutes, a PTFE microporous film is laid on the surface of the sintered composite fiber web, and hot pressing is carried out for 30-60 seconds; S4. the hot-pressed composite fiber web is hot-pressed and solidified for 2-3 minutes, is quickly passed through a flame, and is calendered for 3-8 seconds, and finally the PPS superfine fiber composite filter material is obtained. The synergistic effect of the dipping modification liquid and the functional modification liquid significantly improves the bonding strength and durability between the membrane and the felt, ensures that interlayer peeling does not occur under complex working conditions of high temperature and high humidity, and a dense network structure formed on the surface further improves the stain resistance and dust removal efficiency.

Description

Technical Field

[0001] This invention relates to the field of composite filter media technology, specifically to PPS ultrafine fiber composite filter media and its preparation method. Background Technology

[0002] Industrial flue gas treatment is a crucial aspect of environmental protection, especially in high-polluting industries such as waste incineration, chemicals, cement, steel, and power generation, where flue gas composition is becoming increasingly complex, often containing acidic gases (such as SO2 and NO). x (This includes) oil mist, water vapor, sticky dust, and various organic pollutants. Such multi-pollutant coexistence conditions place stringent comprehensive performance requirements on filter materials, making traditional single-material filter media inadequate.

[0003] Currently, commonly used high-temperature filter media on the market mainly include pure PPS (polyphenylene sulfide) filter media and pure PTFE (polytetrafluoroethylene) filter media, as well as PTFE-coated PPS composite filter media developed based on these. While pure PPS filter media has good acid and temperature resistance, its oxidation resistance is poor. Under conditions of high oxygen content or the presence of oil mist, it is prone to oxidative embrittlement, leading to decreased fiber strength, filter bag damage, and the so-called "bag clogging" phenomenon. This causes a sharp increase in operating resistance, makes dust removal difficult, and severely affects service life. Pure PTFE filter media has excellent chemical stability, corrosion resistance, and anti-adhesion properties, but its high cost, low mechanical strength, and poor processing performance, coupled with its inability to withstand high-load mechanical erosion and system pressure differentials when used alone, limit its large-scale industrial applications.

[0004] To balance performance and cost, PTFE-coated PPS composite filter media have emerged. These products attempt to combine the mechanical strength of PPS with the surface filtration properties of PTFE by laminating a layer of PTFE microporous membrane onto the surface of a PPS base fabric. However, existing lamination processes mostly employ direct hot-press bonding, relying primarily on physical adhesion between the PTFE membrane and the PPS base fabric, resulting in weak interfacial bonding. Under actual operating conditions of high temperature, high humidity, frequent temperature fluctuations, or severe chemical corrosion, the membrane layer is prone to peeling, cracking, or micropore blockage, leading to failure of surface filtration, reduced filtration accuracy, and a service life far below expectations. Furthermore, traditional composite filter media have a single functional structure, unable to achieve functional zoning and adaptive adjustment for different pollutant combinations, resulting in insufficient adaptability in complex and variable flue gas environments.

[0005] With increasingly stringent environmental protection requirements, industrial users are placing higher demands on the lifespan, stability, and operating costs of filter media. Therefore, developing a high-performance composite filter media with strong interfacial bonding, rational functional zoning, excellent temperature resistance, corrosion resistance, anti-adhesion, high strength, and adaptability to complex pollutant conditions has become a pressing technical challenge in this field. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide PPS ultrafine fiber composite filter material and its preparation method.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] The preparation method of PPS ultrafine fiber composite filter media includes the following preparation steps:

[0009] S1. By weight, 60-70 parts of PPS fiber (fineness 2-3 dtex, length 51-64 mm) and 25-30 parts of glass fiber (alkali-free glass fiber, diameter 5-9 μm) are put into an opening mixer for 10-15 minutes. After mixing evenly, the fiber is carded and laid out using a multi-layer carding and web-laying machine and then needle-punched to reinforce it, thus obtaining a two-layer composite fiber web.

[0010] S2. The two-layer composite fiber web obtained in step S1 is immersed in the impregnation modification solution for 30-60 seconds, and the penetration depth is controlled at 100-200 μm. After impregnation, excess emulsion is squeezed out, and the liquid carry-over rate is controlled at 30-40%.

[0011] S3. Sinter the composite fiber web impregnated in step S2 at high temperature for 3-5 minutes, then lay the PTFE microporous film (thickness 10-30μm, pore size 0.5-2μm) flat on the surface of the composite fiber web after high temperature sintering, and hot press it at a pressure of 0.3-0.5MPa and a temperature of 280-300℃ for 30-60 seconds.

[0012] S4. The composite fiber web after hot pressing in step S3 is hot-pressed and cured at a pressure of 0.2-0.4MPa and a temperature of 260-280℃ for 2-3 minutes, then quickly passed through a flame to remove surface fuzz, and then calendered for 3-8 seconds to finally obtain PPS ultrafine fiber composite filter material.

[0013] The preparation of the impregnation modification solution includes the following steps:

[0014] S21. By weight, mix 100-110 parts of PTFE emulsion with 30-45 parts of functional modification liquid, and stir at a speed of 150-200 r / min for 10-15 min to obtain preliminary modification liquid;

[0015] S22. Add 1-3 parts of silane coupling agent KH-550 to the preliminary modified liquid obtained in step S21, and continue stirring at a speed of 150-200 r / min for 10-15 min to obtain the secondary modified liquid;

[0016] S23. Add 5-10 parts of polytetrafluoroethylene micro powder (particle size 0.5-2μm) and 3-5 parts of nano-alumina (particle size 20-30nm) to the secondary modified solution obtained in step S22. Stir at 500-600r / min for 20-30min and then adjust the solid content to 30-35% with deionized water to obtain the impregnation modified solution.

[0017] Preferably, the preparation of the functional modified liquid includes the following steps:

[0018] S211. By weight, mix 20-30 parts of a 10% polyimide resin solution and 10-15 parts of a 5% polyether ether ketone resin solution, and stir at 200-300 r / min for 10-15 min to obtain a preliminary mixture.

[0019] S212. Add 1-2 parts of polytetrafluoroethylene, 1-2 parts of acrylate, 0.5-1.5 parts of antioxidant 1010 and 1-2 parts of crosslinking agent to the preliminary mixture obtained in step S211, and stir at 300-400 r / min for 15-20 min to obtain the secondary mixture.

[0020] S213. Adjust the solid content of the secondary mixture obtained in step S212 to 12-15% with deionized water, pass it through a 200-mesh sieve, and finally obtain the functional modified liquid.

[0021] Preferably, the base fabric layer of the multi-layer carding and web-laying machine has a strength of 300-350 g / m². 2 The filter felt layer has a density of 150-200 g / m². 2 The net laying speed is 5-8m / min.

[0022] Preferably, the needle density for needle reinforcement is 500-800 needles / cm². 2 The needle insertion depth is 8-12mm.

[0023] Preferably, the high-temperature sintering temperature in step S3 is 320-350℃.

[0024] Preferably, the pressure of the calendering process in step S4 is 0.1-0.2 MPa, and the temperature is 200-220℃.

[0025] Preferably, the solid content of the PTFE emulsion in step S21 is 60%.

[0026] Preferably, the crosslinking agent is selected from crosslinking agent XC-103.

[0027] PPS ultrafine fiber composite filter media is prepared by the above preparation method.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. This invention significantly improves the bonding strength and durability between the membrane and the felt through the synergistic effect of the impregnation modification liquid and the functional modification liquid, ensuring that no interlayer delamination occurs under complex working conditions of high temperature and high humidity. The dense network structure formed on the surface further improves the anti-fouling properties and dust removal efficiency.

[0030] 2. This invention utilizes a three-dimensional structure consisting of a PTFE-coated surface layer, a PPS / glass fiber blended base fabric, and a refined PPS filter felt layer. The surface layer leverages the excellent anti-sticking and chemical resistance of PTFE to effectively resist oil mist and sticky substances; the middle layer utilizes the strength and inherent temperature and acid / alkali resistance of PPS fibers to serve as the load-bearing structure; and the inner layer achieves efficient collection through a microporous structure. The three layers work together to achieve comprehensive performance that is difficult to achieve with a single filter material. Attached Figure Description

[0031] Figure 1 This is a process flow diagram for preparing the PPS ultrafine fiber composite filter material of the present invention;

[0032] Figure 2 This is a flow chart of the preparation process of the impregnation modification liquid of the present invention;

[0033] Figure 3 This is a flow chart of the preparation process of the functional modified liquid of the present invention. Detailed Implementation

[0034] The present invention will now be clearly and completely described in conjunction with embodiments thereof. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-3 The present invention provides a technical solution:

[0036] Example 1

[0037] Preparation method of PPS ultrafine fiber composite filter media:

[0038] Before preparing PPS ultrafine fiber composite filter media, the functional modification liquid and impregnation modification liquid are prepared first:

[0039] The preparation of the functional modified liquid includes the following steps:

[0040] S211. Mix 20g of 10% polyimide resin solution and 10g of 5% polyether ether ketone resin solution, and stir at 200r / min for 10min to obtain a preliminary mixture.

[0041] S212. Add 1g of polytetrafluoroethylene, 1g of acrylate, 0.5g of antioxidant 1010 and 1g of crosslinking agent XC-103 to the preliminary mixture obtained in step S211, and stir at 300r / min for 15min to obtain the secondary mixture.

[0042] S213. Adjust the solid content of the secondary mixture obtained in step S212 to 12% with deionized water, pass it through a 200-mesh sieve, and finally obtain the functional modified liquid.

[0043] The preparation of the impregnation modification solution includes the following steps:

[0044] S21. Mix 100g of PTFE emulsion with a solid content of 60% with 30g of functional modification liquid, and stir at 150r / min for 10min to obtain the preliminary modification liquid;

[0045] S22. Add 1g of silane coupling agent KH-550 to the preliminary modified solution obtained in step S21, and continue stirring at 150r / min for 10min to obtain the secondary modified solution;

[0046] S23. Add 5g of polytetrafluoroethylene micro powder and 3g of nano-alumina to the modified solution obtained in step S22, stir at 500r / min for 20min, and then adjust the solid content to 30% with deionized water to obtain the impregnation modified solution.

[0047] S1. Add 60g of PPS fiber and 25g of glass fiber to an opening mixer for 10 minutes. After mixing evenly, use a multi-layer carding and web-laying machine to card and lay the web, and then needle-punch to reinforce it, to obtain a two-layer composite fiber web. The base fabric layer of the multi-layer carding and web-laying machine is 300g / m². 2 The filter felt layer has a strength of 150g / m². 2 The netting speed is 5m / min, and the needle-punching density for reinforcement is 500 needles / cm². 2 The needle puncture depth is 8mm;

[0048] S2. The two-layer composite fiber web obtained in step S1 is immersed in the impregnation modification solution for 30 seconds, and the penetration depth is controlled at 100 μm. After impregnation, excess emulsion is squeezed out, and the liquid carry-over rate is controlled at 30%.

[0049] S3. The composite fiber web impregnated in step S2 is sintered at 320°C for 3 minutes, and then the PTFE microporous film is laid flat on the surface of the composite fiber web after high temperature sintering, and hot-pressed at 0.3MPa pressure and 280°C for 30 seconds.

[0050] S4. The composite fiber web after hot pressing in step S3 is cured by hot pressing at a pressure of 0.2MPa and a temperature of 260℃ for 2 minutes, and then quickly passed through a flame to remove surface fuzz. After that, it is calendered at a pressure of 0.1MPa and a temperature of 200℃ for 3 seconds to finally obtain PPS ultrafine fiber composite filter material.

[0051] Example 2

[0052] Preparation method of PPS ultrafine fiber composite filter media:

[0053] Before preparing PPS ultrafine fiber composite filter media, functional modification liquid and impregnation modification liquid are prepared first:

[0054] The preparation of the functional modified liquid includes the following steps:

[0055] S211. Mix 30g of a 10% polyimide resin solution and 15g of a 5% polyether ether ketone resin solution, and stir at 300r / min for 15min to obtain a preliminary mixture.

[0056] S212. Add 2g of polytetrafluoroethylene, 2g of acrylate, 1.5g of antioxidant 1010 and 2g of crosslinking agent XC-103 to the preliminary mixture obtained in step S211, and stir at 400r / min for 20min to obtain the secondary mixture.

[0057] S213. Adjust the solid content of the secondary mixture obtained in step S212 to 15% with deionized water, pass it through a 200-mesh sieve, and finally obtain the functional modified liquid.

[0058] The preparation of the impregnation modification solution includes the following steps:

[0059] S21. Mix 110g of PTFE emulsion with a solid content of 60% with 45g of functional modification liquid, and stir at 200r / min for 15min to obtain the preliminary modification liquid;

[0060] S22. Add 3g of silane coupling agent KH-550 to the preliminary modified solution obtained in step S21, and continue stirring at 200r / min for 15min to obtain the secondary modified solution;

[0061] S23. Add 10g of polytetrafluoroethylene micro powder and 5g of nano-alumina to the modified solution obtained in step S22, stir at 600r / min for 30min, and then adjust the solid content to 35% with deionized water to obtain the impregnation modified solution.

[0062] S1. Add 70g of PPS fiber and 30g of glass fiber to an opening mixer for 15 minutes. After mixing evenly, use a multi-layer carding and web-laying machine to card and lay the web, and then needle-punch to reinforce it, to obtain a two-layer composite fiber web. The base fabric layer of the multi-layer carding and web-laying machine is 350g / m². 2 The filter felt layer has a strength of 200g / m². 2 The netting speed is 8m / min, and the needle-punching reinforcement density is 800 needles / cm². 2 The needle puncture depth was 12mm;

[0063] S2. The two-layer composite fiber web obtained in step S1 is immersed in the impregnation modification solution for 60 seconds, and the penetration depth is controlled at 200 μm. After impregnation, excess emulsion is squeezed out, and the liquid carry-over rate is controlled at 40%.

[0064] S3. The composite fiber web impregnated in step S2 is sintered at 350°C for 5 minutes, and then the PTFE microporous film is laid flat on the surface of the composite fiber web after high temperature sintering, and hot-pressed at 0.5MPa pressure and 300°C for 60 seconds.

[0065] S4. The composite fiber web after hot pressing in step S3 is hot-pressed and cured at a pressure of 0.4 MPa and a temperature of 280°C for 3 minutes. Then, it is quickly passed through a flame to remove surface fuzz and then calendered at a pressure of 0.2 MPa and a temperature of 220°C for 8 seconds to finally obtain PPS ultrafine fiber composite filter material.

[0066] Example 3

[0067] Preparation method of PPS ultrafine fiber composite filter media:

[0068] Before preparing PPS ultrafine fiber composite filter media, functional modification liquid and impregnation modification liquid are prepared first:

[0069] The preparation of the functional modified liquid includes the following steps:

[0070] S211. Mix 25g of 10% polyimide resin solution and 13g of 5% polyether ether ketone resin solution, and stir at 250r / min for 13min to obtain a preliminary mixture.

[0071] S212. Add 1.5g polytetrafluoroethylene, 1.5g acrylate, 1g antioxidant 1010 and 1.5g crosslinking agent XC-103 to the preliminary mixture obtained in step S211, and stir at 350r / min for 18min to obtain the secondary mixture.

[0072] S213. Adjust the solid content of the secondary mixture obtained in step S212 to 13% with deionized water, pass it through a 200-mesh sieve, and finally obtain the functional modified liquid.

[0073] The preparation of the impregnation modification solution includes the following steps:

[0074] S21. Mix 105g of PTFE emulsion with a solid content of 60% with 35g of functional modification liquid, and stir at 180r / min for 13min to obtain the preliminary modification liquid;

[0075] S22. Add 2g of silane coupling agent KH-550 to the preliminary modified solution obtained in step S21, and continue stirring at 180r / min for 13min to obtain the secondary modified solution;

[0076] S23. Add 8g of polytetrafluoroethylene micro powder and 4g of nano-alumina to the modified solution obtained in step S22, stir at 550r / min for 25min, and then adjust the solid content to 33% with deionized water to obtain the impregnation modified solution.

[0077] S1. Add 65g of PPS fiber and 28g of glass fiber to an opening mixer for 13 minutes. After mixing evenly, use a multi-layer carding and web-laying machine to card and lay the web, and then needle-punch to reinforce it, to obtain a two-layer composite fiber web. The base fabric layer of the multi-layer carding and web-laying machine has a density of 320g / m². 2 The filter felt layer has a strength of 180g / m². 2 The netting speed is 6m / min, and the needle-punching density is 700 needles / cm². 2 The needle insertion depth is 10mm;

[0078] S2. The two-layer composite fiber web obtained in step S1 is immersed in the impregnation modification solution for 45 seconds, and the penetration depth is controlled at 150 μm. After impregnation, excess emulsion is squeezed out, and the liquid carry-over rate is controlled at 35%.

[0079] S3. The composite fiber web impregnated in step S2 is sintered at 340°C for 4 minutes, and then the PTFE microporous film is laid flat on the surface of the composite fiber web after high temperature sintering, and hot-pressed at 0.4MPa pressure and 290°C for 50 seconds.

[0080] S4. The composite fiber web after hot pressing in step S3 is hot-pressed and cured at a pressure of 0.3MPa and a temperature of 270℃ for 2.5 minutes. Then, it is quickly passed through a flame to remove surface fuzz. Finally, it is calendered at a pressure of 0.15MPa and a temperature of 210℃ for 5 seconds to obtain PPS ultrafine fiber composite filter material.

[0081] Comparative Example 1

[0082] The only difference between Comparative Example 1 and Example 1 is that no functional modification liquid was added in this comparative example; the other steps are exactly the same in Comparative Example 1 and Example 1.

[0083] Comparative Example 2

[0084] The only difference between Comparative Example 2 and Example 1 is that the impregnation modification liquid is replaced with a PTFE emulsion with a solid content of 60% in this comparative example. The other steps are exactly the same in Comparative Example 2 and Example 1.

[0085] Performance testing:

[0086] According to GB / T 3923.1 "Textiles - Tensile properties of fabrics - Part 1: Determination of breaking strength and elongation at break (strip method)", the longitudinal breaking strength and transverse breaking strength of the PPS microfiber composite filter media obtained in Examples 1-3 and Comparative Examples 1-2 were tested using an electronic tensile testing machine at a speed of 100 mm / min until breakage.

[0087] According to GB / T 21196.3 "Textiles - Martindale Method - Determination of Abrasion Resistance of Fabrics - Part 3: Determination of Mass Loss", the abrasion resistance of the PPS microfiber composite filter media obtained in Examples 1-3 and Comparative Examples 1-2 was tested. The number of abrasion cycles was recorded until the material broke using a Martindale abrasion tester.

[0088] According to GB / T 2791 "Determination of peel strength of adhesives", the peel strength (membrane-base) of PPS microfiber composite filter media obtained in Examples 1-3 and Comparative Examples 1-2 was tested. The peel force between the PTFE membrane and the base fabric was determined by the 180° peel method.

[0089] According to GB / T 24218.3 "Textiles - Test methods - Part 3: Determination of breaking strength and elongation" + high temperature treatment, the temperature resistance (heat shrinkage rate) of the PPS microfiber composite filter media obtained in Examples 1-3 and Comparative Examples 1-2 was tested, and the dimensional change rate after treatment at 260℃ for 30 min was calculated.

[0090] The PPS ultrafine fiber composite filter media obtained in Examples 1-3 and Comparative Examples 1-2 were soaked in 10% H2SO4 and 10% NaOH for 24 hours, and the strength retention rate was measured to obtain their acid and alkali resistance (strength retention rate). The final data are shown in Table 1 below:

[0091] Table 1 Performance Test Results

[0092]

[0093] As shown in Table 1, the PPS ultrafine fiber composite filter media obtained in Examples 1-3 outperformed the comparative examples in all aspects. This demonstrates that the synergistic effect of the impregnation and functional modification liquids significantly improves the mechanical strength, wear resistance, temperature resistance, and interfacial bonding of the filter media, enhancing the bonding strength and durability between the membrane and the felt. The PPS ultrafine fiber composite filter media of this invention is particularly suitable for complex working conditions involving high temperature, high humidity, and multiple pollutants, and has significant application advantages in industries such as waste incineration, chemical engineering, and cement.

[0094] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing PPS ultrafine fiber composite filter media, characterized in that, The preparation steps include the following: S1. By weight, 60-70 parts of PPS fiber and 25-30 parts of glass fiber are put into an opening mixer for 10-15 minutes. After mixing evenly, the mixture is carded and laid out using a multi-layer carding and web-laying machine and then needle-punched to reinforce it, resulting in a two-layer composite fiber web. S2. The two-layer composite fiber web obtained in step S1 is immersed in the impregnation modification solution for 30-60 seconds, and the penetration depth is controlled at 100-200 μm. After impregnation, excess emulsion is squeezed out, and the liquid carry-over rate is controlled at 30-40%. S3. Sinter the composite fiber web impregnated in step S2 at high temperature for 3-5 minutes, then spread the PTFE microporous film on the surface of the composite fiber web after high temperature sintering, and hot press it at a pressure of 0.3-0.5MPa and a temperature of 280-300℃ for 30-60 seconds. S4. The composite fiber web after hot pressing in step S3 is hot-pressed and cured at a pressure of 0.2-0.4MPa and a temperature of 260-280℃ for 2-3 minutes, then quickly passed through a flame to remove surface fuzz, and then calendered for 3-8 seconds to finally obtain PPS ultrafine fiber composite filter material. The preparation of the impregnation modification solution includes the following steps: S21. By weight, mix 100-110 parts of PTFE emulsion with 30-45 parts of functional modification liquid, and stir at a speed of 150-200 r / min for 10-15 min to obtain preliminary modification liquid; S22. Add 1-3 parts of silane coupling agent KH-550 to the preliminary modified liquid obtained in step S21, and continue stirring at a speed of 150-200 r / min for 10-15 min to obtain the secondary modified liquid; S23. Add 5-10 parts of polytetrafluoroethylene micro powder and 3-5 parts of nano alumina to the modified solution obtained in step S22, stir at a speed of 500-600 r / min for 20-30 min, and then adjust the solid content to 30-35% with deionized water to obtain the impregnation modified solution. The preparation of the functional modified liquid includes the following steps: S211. By weight, mix 20-30 parts of a 10% polyimide resin solution and 10-15 parts of a 5% polyether ether ketone resin solution, and stir at 200-300 r / min for 10-15 min to obtain a preliminary mixture. S212. Add 1-2 parts of polytetrafluoroethylene, 1-2 parts of acrylate, 0.5-1.5 parts of antioxidant 1010 and 1-2 parts of crosslinking agent to the preliminary mixture obtained in step S211, and stir at 300-400 r / min for 15-20 min to obtain the secondary mixture. S213. Adjust the solid content of the secondary mixture obtained in step S212 to 12-15% with deionized water, pass it through a 200-mesh sieve, and finally obtain the functional modified liquid.

2. The method for preparing PPS ultrafine fiber composite filter material according to claim 1, characterized in that, The base fabric layer of the multi-layer carding and web-laying machine has a strength of 300-350 g / m². 2 The filter felt layer has a density of 150-200 g / m². 2 The net laying speed is 5-8m / min.

3. The method for preparing PPS ultrafine fiber composite filter material according to claim 1, characterized in that, The needle density for the needle reinforcement is 500-800 needles / cm². 2 The needle insertion depth is 8-12mm.

4. The method for preparing PPS ultrafine fiber composite filter material according to claim 1, characterized in that, The high-temperature sintering temperature in step S3 is 320-350℃.

5. The method for preparing PPS ultrafine fiber composite filter material according to claim 1, characterized in that, In step S4, the pressure for calendering is 0.1-0.2 MPa and the temperature is 200-220℃.

6. The method for preparing PPS ultrafine fiber composite filter material according to claim 1, characterized in that, In step S21, the solid content of the PTFE emulsion is 60%.

7. The method for preparing PPS ultrafine fiber composite filter material according to claim 1, characterized in that, The crosslinking agent is selected from crosslinking agent XC-103.

8. PPS ultrafine fiber composite filter media, characterized in that, It is prepared by the preparation method described in any one of claims 1-7.

Images