A polyphenylene sulfide fiber pps filter bag

Abstract

The application discloses a kind of polyphenyl sulfide fiber pps filter bag, it is related to filter material technical field.The application discloses a kind of preparation method of polyphenyl sulfide fiber pps filter bag, comprising the following steps: polyphenyl sulfide, modified silica is fused extrusion granulation, and granulated material is obtained;Granulated material is melt-blown spinning, heat setting, hot rolling, and pps filter bag is obtained;Modified silica is obtained after being modified by ethylenediamine tetraacetic acid anhydride from aminated mesoporous silica, and then being treated by epichlorohydrin epoxy.The modified silica prepared in the application is added to polyphenyl sulfide granulation, melt-blown treatment, and the obtained polyphenyl sulfide fiber has the characteristics of good mechanical properties, the polyphenyl sulfide fiber prepared by the application is used to prepare pps filter bag, and the prepared filter bag is applied to filter high-temperature flue gas, has the advantages of oxidation resistance and crosslinking resistance, and has high filtration precision and trapping effect in filtering flue gas in thermal oxygen environment.

Description

Technical Field

[0001] This invention relates to the field of filter material technology, specifically to a polyphenylene sulfide fiber (PPS) filter bag. Background Technology

[0002] With the rapid development of energy-intensive heavy industries, the exhaust gases emitted from various industrial furnaces and kilns closely related to high-energy-consuming and high-polluting industries are not only high in temperature but also contain large amounts of dust and harmful gases. The main components of these flue gases include large amounts of soot, carbon monoxide, and sulfur dioxide, with emission temperatures ranging from 100-200℃. Particulate matter (PM) pollution, as a serious type of air pollution, with PM2.5 and PM10 entering the bloodstream through the respiratory system, can lead to respiratory and cardiovascular diseases. Therefore, effectively controlling high-temperature industrial dust is of great significance for environmental protection and human health. Existing high-temperature dust removal technologies mainly involve baghouse dust collectors, and the filter bag is the core component determining the performance of a baghouse dust collector. As a high-temperature resistant filter material, polyphenylene sulfide (PPS) fiber is one of the most widely used fiber filter media due to its excellent thermal stability and corrosion resistance. PPS can be used continuously at 190℃ and has advantages such as significant solvent corrosion resistance, good fiber spinnability, high dimensional stability, and insulation properties, making it an important filter material.

[0003] Polyphenylene sulfide (PPS) is a semi-crystalline polymer with molecular chains consisting of alternating benzene rings and sulfur atoms. Its main characteristic is that it maintains good physical properties even under harsh chemical environments and exhibits excellent fatigue resistance. The superior physicochemical properties of PPS are attributed to its unique chemical structure. The rigid, linear benzene ring structure of PPS allows filter media made from PPS fibers to be continuously exposed to high-temperature environments up to 190°C. While the thioether bonds provide flexibility, the sulfur in the PPS molecule exists in a divalent state. Due to the instability of the outermost electrons of sulfur, it has many valences and easily loses electrons to combine with oxygen. This leads to the oxidation of sulfur bonds in PPS at high temperatures with oxygen content exceeding 15%, causing oxidative cross-linking of the PPS macromolecules. This reduces the crystallinity of PPS and accelerates crystallization at high temperatures, ultimately leading to degradation and breakage, thus limiting its applications. Summary of the Invention

[0004] The purpose of this invention is to provide a polyphenylene sulfide (PPS) filter bag to solve the following technical problems:

[0005] Due to the instability of the outermost electrons of the sulfur (S) layer in the polyphenylene sulfide (PPS) molecule, PPS is prone to losing electrons and combining with oxygen when the oxygen content is higher than 15%, leading to degradation and macromolecular breakage, which limits its application.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A polyphenylene sulfide fiber (PPS) filter bag, and a method for preparing the PPS filter bag, comprising the following steps:

[0008] A1: Polyphenylene sulfide and modified silica are melt-extruded and granulated to obtain granules;

[0009] A2: The granular material is meltblown, heat-set, and hot-rolled to obtain PPS filter bags;

[0010] The preparation method of modified silica includes the following steps:

[0011] S1: Polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, deionized water, and hydrochloric acid solution were added to a reaction flask and dispersed evenly. Tetraethyl orthosilicate and γ-aminopropyltrimethoxysilane were added. The temperature was controlled at 40-50℃, and the reaction was carried out under stirring for 12-24 hours. The reaction was centrifuged, washed with ethanol to remove the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, and dried to obtain aminated mesoporous silica.

[0012] S2: Aminated mesoporous silica and N,N-dimethylformamide are added to a reaction vessel and dispersed evenly. Ethylenediaminetetraacetic anhydride is added and dispersed evenly. The mixture is stirred at room temperature for 12-24 hours. After filtration, washing and drying, component one is obtained.

[0013] S3: Epichlorohydrin, N,N-dimethylformamide, potassium iodide, and potassium fluoride are added to a reaction vessel and dispersed evenly. Component 1 is then added and dispersed evenly. The temperature is controlled at 110-120℃, and the reaction is maintained at this temperature for 12-15 hours. The mixture is then centrifuged, washed, dried, pulverized, and sieved to obtain modified silica.

[0014] As a further aspect of the present invention: the hydrochloric acid solution in S1 is a 2-3 mol / L hydrochloric acid aqueous solution; the addition ratio of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, deionized water, hydrochloric acid solution, tetraethyl orthosilicate, and γ-aminopropyltrimethoxysilane is 1-1.1g: 5-10mL: 20-30mL: 20g: 10-15g.

[0015] As a further aspect of the present invention: the addition ratio of aminated mesoporous silica, N,N-dimethylformamide, and ethylenediaminetetraacetic anhydride in S2 is 1g:50-100mL:0.5-1g.

[0016] As a further embodiment of the present invention: the addition ratio of epichlorohydrin, N,N-dimethylformamide, potassium iodide, potassium fluoride and component one in S3 is 10-20mL: 100-200mL: 5-10g: 30-35g: 1g.

[0017] As a further aspect of the present invention: the modified mesoporous silica accounts for 1.5-2.5% of the total mass of the granules.

[0018] As a further aspect of the present invention, the specific steps of melt extrusion granulation in A1 are as follows: extrusion is performed using a twin-screw extruder; during the extrusion process, the melt temperature is 290-320℃ and the screw speed is 190-210rpm.

[0019] As a further embodiment of the present invention: in A2, the spinning speed of meltblown spinning is 500-10000 m / min, the meltblown processing temperature is 330-360℃, the draw ratio is 3-5, and the draw temperature is 90-120℃.

[0020] As a further aspect of the present invention, the specific steps of heat setting in A2 are: treatment at 100-105℃ for 2-4 minutes, treatment at 110-120℃ for 3-6 minutes, and treatment at 180-190℃ for 2-4 minutes.

[0021] As a further aspect of the present invention, the specific steps of hot rolling in A2 are as follows: hot rolling temperature is 230-280℃, and hot rolling time is 20-40 seconds.

[0022] As a further aspect of the present invention, the pore size of the PPS filter bag is 1-100 μm.

[0023] The beneficial effects of this invention are:

[0024] (1) This application uses tetraethyl orthosilicate and γ-aminopropyltrimethoxysilane as raw materials, and polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer as a pore-forming agent to prepare aminated mesoporous silica; and uses ethylenediaminetetraacetic anhydride to react with the aminated mesoporous silica to obtain mesoporous silica with a large number of carboxyl groups on the surface, i.e., component one. This application uses epichlorohydrin to react with the carboxyl groups on the surface of component one to graft a large number of epoxy groups on the surface of mesoporous silica to obtain modified silica. The modified silica prepared in this application is granulated with polyphenylene sulfide by melt extrusion to obtain granules; the polyphenylene sulfide granules prepared in this application are melt-blown spun, heat-set, and hot-rolled to obtain PPS filter bags. The PPS filter bags prepared in this application have the characteristics of easily capturing fine dust and having good peeling performance, and still maintain excellent filtration performance in a hot and oxygen environment.

[0025] (2) The modified silica prepared in this application has excellent high-temperature resistance and extremely high surface activity, inhibiting the oxidation and cross-linking of polyphenylene sulfide (PPS). The amide groups generated during the preparation of the modified silica in this application act as antioxidant groups, oxidizing before the sulfur bonds and reducing the corrosion of PPS by oxygen. This application uses modified silica to modify PPS, improving its heat resistance and enabling it to be used for a long time under oxygen-containing high-temperature conditions. The modified silica increases the oxidation induction temperature of PPS, giving the prepared PPS filter bags heat- and oxygen-resistant stability.

[0026] The modified silica prepared in this application has a mesoporous structure, which effectively stores heat energy when the PPS filter bag is heated, effectively reducing the energy absorption of polyphenylene sulfide (PPS) macromolecular chain segments, thereby reducing the mobility of PPS chain segments and improving the stability of PPS at high temperatures. The modified silica prepared in this application has an oxygen-deficient surface, which makes its surface highly active. When the molecular bonds on the benzene ring of PPS open to form free radicals in a hot and oxygen-rich environment, there is a tendency for the modified silica to form bonds with the free radicals, inhibiting the oxidative crosslinking of PPS. The modified mesoporous silica prepared in this application has strong surface activity and forms chemical crosslinking with the -S- bonds on the PPS molecular chain, making it difficult for sulfur atoms to react with oxygen in the air, thereby inhibiting the oxidation of sulfur atoms in PPS. The modified silica prepared in this application has antioxidant and anti-crosslinking effects on PPS.

[0027] (3) The modified silica prepared in this application crosslinks with polyphenylene sulfide. The organic molecular chains wrapped on the surface of the modified silica exhibit a tough microfiber network structure. When the material is impacted, the mesoporous silica coated in the organic molecular chains experiences relative slippage. The organic molecular chains on the surface of the mesoporous silica deform first. The silver craze caused by the deformation is terminated by the organic molecular chains on the surface of the silica and absorbs a large amount of energy. The organic molecular chains grafted on the surface of the modified silica prepared in this application and the polyphenylene sulfide molecular chains intertwine to form a microfiber structure. The silica particles act as skeletal connection points, resulting in stronger interfacial interaction and achieving a toughening effect. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1: The preparation method of modified silica includes the following steps:

[0030] S1: 1g of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer (P123), 5mL of deionized water, and 20mL of 2mol / L hydrochloric acid aqueous solution were added to a reaction flask and dispersed evenly. 20g of tetraethyl orthosilicate and 10g of γ-aminopropyltrimethoxysilane were added. The temperature was controlled at 40℃, and the reaction was kept at this temperature for 12h under stirring. After centrifugation, washing with ethanol, and drying, the preproduct was obtained. 1g of the preproduct was mixed with 2mL of 36wt% hydrochloric acid aqueous solution and 150mL of anhydrous ethanol. The temperature was controlled at 50℃ and stirred for 3h. After washing with anhydrous ethanol and drying, aminated mesoporous silica was obtained.

[0031] S2: Add 1g of aminated mesoporous silica and 50mL of N,N-dimethylformamide to the reaction vessel and disperse evenly. Add 0.5g of ethylenediaminetetraacetic anhydride and disperse evenly. Stir the reaction at room temperature for 12h. Filter, wash and dry to obtain component one.

[0032] S3: Add 10 mL of epichlorohydrin, 100 mL of N,N-dimethylformamide, 5 g of potassium iodide, and 30-35 g of potassium fluoride to a reaction vessel and disperse evenly. Add 1 g of component one and disperse evenly. Control the temperature at 110℃ and keep the reaction at this temperature for 12 h. Centrifuge, wash, dry, pulverize and sieve to obtain modified silica.

[0033] Example 2: The preparation method of modified silica includes the following steps:

[0034] S1: 1g of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer (P123), 10mL of deionized water, and 20mL of 2mol / L hydrochloric acid aqueous solution were added to a reaction flask and dispersed evenly. 20g of tetraethyl orthosilicate and 12g of γ-aminopropyltrimethoxysilane were added. The temperature was controlled at 45℃, and the reaction was kept at this temperature for 18h under stirring. After centrifugation, washing with ethanol, and drying, the preproduct was obtained. 1g of the preproduct was mixed with 2mL of 36wt% hydrochloric acid aqueous solution and 150mL of anhydrous ethanol. The temperature was controlled at 50℃ and stirred for 3h. After washing with anhydrous ethanol and drying, aminated mesoporous silica was obtained.

[0035] S2: Add 1g of aminated mesoporous silica and 70mL of N,N-dimethylformamide to the reaction vessel and disperse evenly. Add 0.8g of ethylenediaminetetraacetic anhydride and disperse evenly. Stir the reaction at room temperature for 18h. Filter, wash and dry to obtain component one.

[0036] S3: Add 15 mL of epichlorohydrin, 150 mL of N,N-dimethylformamide, 8 g of potassium iodide, and 32 g of potassium fluoride to a reaction vessel and disperse evenly. Add 1 g of component one and disperse evenly. Control the temperature at 115℃ and keep the reaction at this temperature for 12 h. Centrifuge, wash, dry, pulverize, and sieve to obtain modified silica.

[0037] Example 3: The preparation method of modified silica includes the following steps:

[0038] S1: 1.1g of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer (P123), 10mL of deionized water, and 30mL of 2mol / L hydrochloric acid aqueous solution were added to a reaction flask and dispersed evenly. 20g of tetraethyl orthosilicate and 15g of γ-aminopropyltrimethoxysilane were added. The temperature was controlled at 50℃, and the reaction was carried out under stirring for 24h. After centrifugation, washing with ethanol, and drying, the preproduct was obtained. 1g of the preproduct was mixed with 2mL of 36wt% hydrochloric acid aqueous solution and 150mL of anhydrous ethanol. The temperature was controlled at 50℃ and stirred for 3h. After washing with anhydrous ethanol and drying, aminated mesoporous silica was obtained.

[0039] S2: Add 1g of aminated mesoporous silica and 100mL of N,N-dimethylformamide to a reaction vessel and disperse evenly. Add 1g of ethylenediaminetetraacetic anhydride and disperse evenly. Stir the reaction at room temperature for 24h. Filter, wash and dry to obtain component one.

[0040] S3: Add 20 mL of epichlorohydrin, 200 mL of N,N-dimethylformamide, 10 g of potassium iodide, and 35 g of potassium fluoride to a reaction vessel and disperse evenly. Add 1 g of component one and disperse evenly. Control the temperature at 120℃ and keep the reaction at this temperature for 15 h. Centrifuge, wash, dry, pulverize, and sieve to obtain modified silica.

[0041] Example 4: A method for preparing a polyphenylene sulfide (PPS) filter bag, comprising the following steps:

[0042] A1: Blending: 98g of polyphenylene sulfide (melt temperature 280℃, Mw=55000) and 2g of modified silica prepared in Example 1 were added to a twin-screw extruder and extruded; during the extrusion process, the melt temperature was 320℃ and the screw speed was 200rpm to obtain granules;

[0043] A2: Meltblown spinning: The granules are meltblown spun at a spinning speed of 1000m / min, a meltblown processing temperature of 330℃, a draw ratio of 4, and a draw temperature of 110℃ to obtain polyphenylene sulfide fibers.

[0044] A3: Heat setting: Heat set the polyphenylene sulfide fiber by treating it at 100℃ for 2 minutes, 110℃ for 3 minutes, and 190℃ for 2 minutes.

[0045] A4: Hot rolling: The hot rolling temperature is 280℃ and the hot rolling time is 20s to obtain PPS filter bags.

[0046] Example 5: A method for preparing a polyphenylene sulfide (PPS) filter bag, comprising the following steps:

[0047] A1: Blending: 98g of polyphenylene sulfide (melt temperature 280℃, Mw=55000) and 2g of modified silica prepared in Example 2 were melt-extruded and granulated to obtain granules;

[0048] A2: Meltblown spinning: The granules are meltblown spun at a spinning speed of 1000m / min, a meltblown processing temperature of 330℃, a draw ratio of 4, and a draw temperature of 110℃ to obtain polyphenylene sulfide fibers.

[0049] A3: Heat setting: Heat set the polyphenylene sulfide fiber by treating it at 100℃ for 2 minutes, 110℃ for 3 minutes, and 190℃ for 2 minutes.

[0050] A4: Hot rolling: The hot rolling temperature is 280℃ and the hot rolling time is 20s to obtain PPS filter bags.

[0051] Example 6: A method for preparing a polyphenylene sulfide (PPS) filter bag, comprising the following steps:

[0052] A1: Blending: 98g of polyphenylene sulfide (melt temperature 280℃, Mw=55000) and 2g of modified silica prepared in Example 3 were melt-extruded and granulated to obtain granules;

[0053] A2: Meltblown spinning: The granules are meltblown spun at a spinning speed of 1000m / min, a meltblown processing temperature of 330℃, a draw ratio of 4, and a draw temperature of 110℃ to obtain polyphenylene sulfide fibers.

[0054] A3: Heat setting: Heat set the polyphenylene sulfide fiber by treating it at 100℃ for 2 minutes, 110℃ for 3 minutes, and 190℃ for 2 minutes.

[0055] A4: Hot rolling: The hot rolling temperature is 280℃ and the hot rolling time is 20s to obtain PPS filter bags.

[0056] The preparation method of the modified silica in Comparative Example 1 includes the following steps:

[0057] S1: Add 10g of nano silica, 6g of γ-aminopropyltrimethoxysilane, 10mL of deionized water and 90mL of anhydrous ethanol to a reaction vessel, control the temperature at 45℃, keep the reaction at the temperature for 18h under stirring, centrifuge, wash and dry to obtain aminated silica.

[0058] S2: Add 1g of aminated silica and 70mL of N,N-dimethylformamide to the reaction vessel and disperse evenly. Add 0.8g of ethylenediaminetetraacetic anhydride and disperse evenly. Stir the reaction at room temperature for 18h. Filter, wash and dry to obtain component one.

[0059] S3: Add 15 mL of epichlorohydrin, 150 mL of N,N-dimethylformamide, 8 g of potassium iodide, and 32 g of potassium fluoride to a reaction vessel and disperse evenly. Add 1 g of component one and disperse evenly. Control the temperature at 115℃ and keep the reaction at this temperature for 12 h. Centrifuge, wash, dry, pulverize, and sieve to obtain modified silica.

[0060] The preparation method of the modified silica in Comparative Example 2 includes the following steps:

[0061] 1.1 g of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer (P123), 10 mL of deionized water, and 30 mL of 2 mol / L hydrochloric acid aqueous solution were added to a reaction flask and dispersed evenly. 20 g of tetraethyl orthosilicate and 15 g of γ-glycidyl etheroxypropyltrimethoxysilane were added. The reaction was carried out at 50 °C with stirring for 24 h. After centrifugation, washing with ethanol, and drying, the preproduct was obtained. 1 g of the preproduct was mixed with 2 mL of 36 wt% hydrochloric acid aqueous solution and 150 mL of anhydrous ethanol. The mixture was stirred at 50 °C for 3 h, washed with anhydrous ethanol, and dried to obtain modified silica.

[0062] The preparation method of the modified silica in Comparative Example 3 includes the following steps:

[0063] 10g of nano-silica, 6g of γ-glycidyl etheroxypropyltrimethoxysilane, 10mL of deionized water, and 90mL of anhydrous ethanol were added to a reaction vessel. The temperature was controlled at 45℃, and the reaction was carried out under stirring for 18h. After centrifugation, washing, and drying, modified silica was obtained.

[0064] Compared with Example 4, Comparative Example 4 only replaced the modified silica prepared in Example 1 with an equal amount of the modified silica prepared in Comparative Example 1. The other components and preparation methods were completely the same as those in Example 4.

[0065] Compared with Example 4, Comparative Example 5 only replaced the modified silica prepared in Example 1 with the modified silica prepared in Comparative Example 2 in an equal amount. The other components and preparation methods were completely the same as those in Example 4.

[0066] Compared with Example 4, Comparative Example 6 only replaced the modified silica prepared in Example 1 with the modified silica prepared in Comparative Example 3 in an equal amount. The other components and preparation methods were completely the same as those in Example 4.

[0067] Performance testing

[0068] (1) Filtration performance: After 6 hours of constant pressure blowing at 1000Pa, the total emission concentration (TOT) and PM2.5 emission concentration were compared. The test results are shown in Table 1.

[0069] Table 1: Statistical Table of Filtration Performance Test Data for Examples 4-6 and Comparative Examples 4-6

[0070]

[0071] As shown in Table 1, the PPS filter bags prepared in this application have the characteristics of smooth and flat surface, and have high filtration accuracy and collection effect in practical applications. The PPS filter bags prepared in this application show higher dust removal effect for high temperature flue gas.

[0072] (2) Mechanical properties: The test was conducted according to GB / T 14344-1993 "Test Method for Breaking Strength and Elongation at Break of Synthetic Fiber Filaments and Textured Yarns"; Test conditions: 20℃, 60RH%; Test method: The tensile test was conducted on the filaments using a GY(B)021 semi-automatic tensile tester with a clamping length of 250mm, a pre-tension of 0.05cN / dtex, and a tensile speed of 155mm / min. The breaking strength and elongation at break of the polyphenylene sulfide fibers prepared in Examples 4-6 and Comparative Examples 4-6 were tested. The polyphenylene sulfide fibers prepared in Examples 4-6 and Comparative Examples 4-6 were subjected to constant temperature treatment at 240℃ for 24h in an air environment. The breaking strength and elongation at break of the materials were then tested according to the above steps. The test results are shown in Table 2.

[0073] Table 2: Statistical Table of Mechanical Property Test Data for Examples 4-6 and Comparative Examples 4-6

[0074]

[0075] As shown in Table 2, the PPS filter bags prepared in this application have good mechanical properties at room temperature; and the material still maintains good mechanical properties after high temperature treatment. The PPS filter bags prepared in this application have stable mechanical strength when used as ultra-high temperature dust collector filter bags in high temperature flue gas dust collector filter bags.

[0076] (3) Thermal oxidation stability: The oxidation induction temperature of the material was measured by differential scanning calorimetry. The specific steps included: placing 5 mg of the samples prepared in Examples 4-6 and Comparative Examples 4-6 into aluminum crucibles, placing the crucibles in the DSC test chamber of a differential scanning calorimeter manufactured by Mettler, purging the samples with oxygen at room temperature for 5 min, controlling the heating rate at 10℃ / min and the oxygen rate at 50 mL / min, heating from room temperature to 550℃ in an oxygen atmosphere, cooling the instrument to room temperature, and calculating the oxidation induction temperature by tangent analysis based on the obtained curve. The test results are shown in Table 3.

[0077] (4) Thermogravimetric properties: Using a thermogravimetric analyzer manufactured by Mettler, 10 mg of the samples prepared in Examples 4-6 and Comparative Examples 4-6 were placed in the instrument, and the heating rate was controlled at 10℃ / min, from room temperature to 600℃. The mass retention rate was calculated, and the test results are shown in Table 3.

[0078] Table 3: Statistical Table of Thermo-Oxidative Stability Test Data for Examples 4-6 and Comparative Examples 4-6

[0079]

[0080]

[0081] As shown in Table 3, the addition of modified silica to the PPS filter bag in this application effectively improves the material's resistance to thermo-oxidative decomposition. The modified polyphenylene sulfide's resistance to thermo-oxidative weight loss temperature is also effectively increased. At 600℃ in air, the mass retention rate is as high as 52% or more, demonstrating excellent thermo-oxidative resistance.

[0082] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A polyphenylene sulfide (PPS) fiber filter bag, characterized in that, The method for preparing the PPS filter bag includes the following steps: A1: Polyphenylene sulfide and modified silica are melt-extruded and granulated to obtain granules; A2: The granular material is meltblown, heat-set, and hot-rolled to obtain PPS filter bags; The method for preparing the modified silica includes the following steps: S1: Polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, deionized water, and hydrochloric acid solution were added to a reaction flask and dispersed evenly. Tetraethyl orthosilicate and γ-aminopropyltrimethoxysilane were added. The temperature was controlled at 40-50℃, and the reaction was carried out under stirring for 12-24 hours. The reaction was centrifuged, washed with ethanol to remove the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, and dried to obtain aminated mesoporous silica. S2: Aminated mesoporous silica and N,N-dimethylformamide are added to a reaction vessel and dispersed evenly. Ethylenediaminetetraacetic anhydride is added and dispersed evenly. The mixture is stirred at room temperature for 12-24 hours. After filtration, washing and drying, component one is obtained. S3: Epichlorohydrin, N,N-dimethylformamide, potassium iodide, and potassium fluoride are added to a reaction vessel and dispersed evenly. Component 1 is then added and dispersed evenly. The temperature is controlled at 110-120℃, and the reaction is maintained at this temperature for 12-15 hours. The mixture is then centrifuged, washed, dried, pulverized, and sieved to obtain modified silica.

2. The polyphenylene sulfide fiber (PPS) filter bag according to claim 1, characterized in that, S1 contains a 2-3 mol / L hydrochloric acid aqueous solution; the addition ratio of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, deionized water, hydrochloric acid solution, tetraethyl orthosilicate, and γ-aminopropyltrimethoxysilane is 1-1.1 g: 5-10 mL: 20-30 mL: 20 g: 10-15 g.

3. The polyphenylene sulfide fiber (PPS) filter bag according to claim 1, characterized in that, The addition ratio of aminated mesoporous silica, N,N-dimethylformamide, and ethylenediaminetetraacetic anhydride in S2 is 1g:50-100mL:0.5-1g.

4. The polyphenylene sulfide fiber (PPS) filter bag according to claim 1, characterized in that, The addition ratio of epichlorohydrin, N,N-dimethylformamide, potassium iodide, potassium fluoride, and component one in S3 is 10-20 mL: 100-200 mL: 5-10 g: 30-35 g: 1 g.

5. A polyphenylene sulfide fiber (PPS) filter bag according to claim 1, characterized in that, Modified mesoporous silica accounts for 1.5-2.5% of the total mass of the granules.

6. A polyphenylene sulfide fiber (PPS) filter bag according to claim 1, characterized in that, The specific steps of melt extrusion granulation in A1 are as follows: extrusion through a twin-screw extruder; during the extrusion process, the melt temperature is 290-320℃ and the screw speed is 190-210rpm.

7. A polyphenylene sulfide fiber (PPS) filter bag according to claim 1, characterized in that, In A2, the spinning speed of meltblown spinning is 500-10000 m / min, the meltblown processing temperature is 330-360℃, the draw ratio is 3-5, and the draw temperature is 90-120℃.

8. A polyphenylene sulfide fiber (PPS) filter bag according to claim 1, characterized in that, The specific steps for heat setting in A2 are: 100-105℃ for 2-4 min, 110-120℃ for 3-6 min, and 180-190℃ for 2-4 min.

9. A polyphenylene sulfide fiber (PPS) filter bag according to claim 1, characterized in that, The specific steps for hot rolling in A2 are: hot rolling temperature of 230-280℃, hot rolling for 20-40 seconds.

10. A polyphenylene sulfide fiber (PPS) filter bag according to claim 1, characterized in that, The pore size of PPS filter bags ranges from 1 to 100 μm.

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