Polyphenylene sulfide fiber pps filter bag

Abstract

The invention discloses a polyphenylene sulfide fiber pps filter bag, and relates to the technical field of filter materials. The invention discloses a preparation method of a polyphenylene sulfide fiber pps filter bag, which comprises the following steps: carrying out melt extrusion granulation on polyphenylene sulfide and modified silicon dioxide to obtain granules; carrying out melt-blowing spinning, heat setting and hot rolling on the granules to obtain a pps filter bag; the modified silicon dioxide is obtained by modifying aminated mesoporous silicon dioxide with ethylenediamine tetraacetic anhydride and then carrying out epoxy treatment with epichlorohydrin. The prepared modified silicon dioxide is added into polyphenylene sulfide for granulation and melt-blowing treatment, the obtained polyphenylene sulfide fiber has the advantage of being good in mechanical property, the prepared polyphenylene sulfide fiber is used for preparing a pps filter bag, the prepared filter bag is applied to filtering treatment of high-temperature flue gas, the advantages of oxidation resistance and cross-linking resistance are achieved, and the application prospect is wide. And high filtering precision and trapping effect are achieved when smoke is filtered in a hot oxygen environment.

Description

Technical Field

[0001] The invention relates to the technical field of filter materials, in particular to a polyphenylene sulfide fiber PPS filter bag. Background Art

[0002] With the rapid development of heavy industry dominated by energy consumption, the exhaust gas emitted by various industrial furnaces closely related to the production of high-energy consumption and high-pollution industries is not only high in temperature, but also contains a large amount of dust and harmful gases. The main components of these flue gases include a large amount of smoke, carbon monoxide, sulfur dioxide, etc., and their emission temperature is also in the range of 100-200℃; particulate matter (PM) pollution is a serious type of air pollution. PM2.5 and PM10 can enter the human blood through the respiratory system, causing respiratory diseases and cardiovascular diseases. Therefore, effective control of high-temperature industrial dust is of great significance to environmental protection and human health. The existing high-temperature dust removal technology is mainly bag dust collector, and the dust filter bag is the core component that determines the performance of the bag dust collector. As a high-temperature resistant filter material, polyphenylene sulfide fiber is one of the most widely used fiber filter materials due to its excellent thermal stability and corrosion resistance. Polyphenylene sulfide can be used continuously at 190℃, and has the advantages of significant solvent corrosion resistance, good fiber spinnability, high dimensional stability and insulation performance. It is an important filter material.

[0003] Polyphenylene sulfide is a semi-crystalline polymer with a molecular chain composed of alternating benzene rings and sulfur atoms. Its main feature is that it maintains good physical properties in harsh chemical environments and has excellent fatigue resistance. The excellent physical and chemical properties of polyphenylene sulfide are attributed to its special chemical structure. The straight-chain rigid benzene ring structure of polyphenylene sulfide enables the filter material prepared from polyphenylene sulfide fiber to be continuously exposed to a high temperature environment of 190°C; the sulfide bond provides flexibility, but since the S in the molecular structure of polyphenylene sulfide is divalent, the outermost electron of S is unstable, which makes it have many valences and easily loses electrons and combines with oxygen, resulting in the oxidation of sulfur bonds in polyphenylene sulfide at high temperatures above 15%, resulting in oxidative cross-linking of polyphenylene sulfide macromolecules, reducing the crystallinity of polyphenylene sulfide, and accelerating the crystallization of polyphenylene sulfide at high temperatures, and then degrading and breaking, thereby limiting its application. Summary of the invention

[0004] The purpose of the present invention is to provide a polyphenylene sulfide fiber pps filter bag to solve the following technical problems:

[0005] Since the outermost electrons of S in the molecular structure of polyphenylene sulfide are unstable, polyphenylene sulfide is prone to lose electrons and combine with oxygen when the oxygen content is higher than 15%, resulting in degradation and breakage of macromolecules, thus limiting its application.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A polyphenylene sulfide fiber PPS filter bag and a preparation method of the PPS filter bag, comprising the following steps:

[0008] A1: melt-extrude polyphenylene sulfide and modified silica to obtain pellets;

[0009] A2: melt-blown spinning, heat setting and hot rolling of the pellets to obtain a pps filter bag;

[0010] The preparation method of modified silicon dioxide comprises the following steps:

[0011] S1: Add polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, deionized water and hydrochloric acid solution into a reaction bottle and disperse them evenly, add tetraethyl orthosilicate and γ-aminopropyltrimethoxysilane, control the temperature at 40-50°C, keep the reaction under stirring for 12-24 hours, centrifuge, wash with ethanol, remove the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, and dry to obtain amino mesoporous silica;

[0012] S2: adding amino mesoporous silica and N,N-dimethylformamide to a reaction kettle and dispersing them evenly, adding ethylenediaminetetraacetic anhydride and dispersing them evenly, stirring and reacting at room temperature for 12-24 hours, filtering, washing and drying to obtain component 1;

[0013] S3: Add epichlorohydrin, N,N-dimethylformamide, potassium iodide and potassium fluoride into the reaction kettle and disperse them evenly, add component 1 and disperse them evenly, control the temperature at 110-120°C, keep the reaction warm for 12-15h, centrifuge, wash, dry, crush and sieve to obtain modified silica.

[0014] As a further solution 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 1-1.1 g: 5-10 mL: 20-30 mL: 20 g: 10-15 g.

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

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

[0017] As a further embodiment 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 solution of the present invention: the specific steps of melt extrusion granulation in A1 are: extrusion through a twin-screw extruder; during the extrusion process, the melt temperature is 290-320° C. and the screw speed is 190-210 rpm.

[0019] As a further solution of the present invention: the spinning speed of melt-blowing in A2 is 500-10000 m / min, the melt-blowing processing temperature is 330-360°C, the drawing ratio is 3-5, and the drawing temperature is 90-120°C.

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

[0021] As a further solution of the present invention: the specific steps of hot rolling in A2 are: hot rolling temperature is 230-280° C., and hot rolling is performed for 20-40 seconds.

[0022] As a further solution of the present invention: the pore size of the pps filter bag is 1-100um.

[0023] Beneficial effects of the present invention:

[0024] (1) The present application uses tetraethyl orthosilicate and γ-aminopropyltrimethoxysilane as raw materials and polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer as a pore-forming agent to prepare amino-modified mesoporous silica; and uses ethylenediaminetetraacetic anhydride to react with the amino-modified mesoporous silica to obtain mesoporous silica with a large number of carboxyl groups on the surface, namely component one. The present 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 the mesoporous silica to obtain modified silica. The modified silica prepared in the present application is granulated with polyphenylene sulfide by melt extrusion to obtain pellets; the polyphenylene sulfide pellets prepared in the present application are melt-blown, heat-set, and hot-rolled to obtain a PPS filter bag. The PPS filter bag prepared in the present application has the advantages of being easy to capture fine dust and having good peeling performance, and still maintains excellent filtering performance in a hot oxygen environment.

[0025] (2) The modified silica prepared in the present application has excellent high temperature resistance and extremely high surface activity, and inhibits the oxidation and cross-linking of polyphenylene sulfide; the amide group generated in the preparation process of the modified silica in the present application acts as an antioxidant group, which is oxidized before the sulfur bond, thereby reducing the corrosion of polyphenylene sulfide by oxygen; the present application uses modified silica to modify polyphenylene sulfide, improves its heat resistance, and enables it to be used for a long time under high temperature conditions containing oxygen. The modified silica increases the oxidation induction temperature of polyphenylene sulfide, so that the prepared PPS filter bag has thermal oxygen stability.

[0026] The modified silica prepared in the present application has a mesoporous structure. When the PPS filter bag is heated, the thermal energy is effectively stored, the energy absorption by the macromolecular chain segments of polyphenylene sulfide is effectively reduced, and the kinetic activity of the polyphenylene sulfide chain segments is reduced, thereby improving the stability of polyphenylene sulfide at high temperatures; the surface of the modified silica prepared in the present application is oxygen-deficient, so that its surface has high activity. When the molecular bonds on the benzene ring of polyphenylene sulfide are opened in a hot oxygen environment to form free radicals, there is a bonding tendency between the modified silica and the free radicals, thereby inhibiting the oxidative cross-linking of polyphenylene sulfide; the modified mesoporous silica prepared in the present application has strong surface activity, and chemically cross-links with the -S- bonds on the molecular chains of polyphenylene sulfide, making it difficult for the sulfur atoms to react with oxygen in the air, thereby inhibiting the oxidation of the sulfur atoms of polyphenylene sulfide. The modified silica prepared in the present application has antioxidant and anti-cross-linking effects on polyphenylene sulfide.

[0027] (3) The modified silica prepared in the present application is cross-linked with polyphenylene sulfide, and the organic molecular chains wrapped on the surface of the modified silica present a tough microfiber network structure. When the material is impacted, the mesoporous silica coated in the organic molecular chains shows relative slip, and the organic molecular chains on the surface of the mesoporous silica are deformed first. The silver streaks caused by the deformation are terminated by the organic molecular chains on the surface of the silica, and a large amount of energy is absorbed; the organic molecular chains grafted on the surface of the modified silica prepared in the present application are entangled with the polyphenylene sulfide molecular chains to form a microfiber structure, and the silica particles act as skeleton connection points, resulting in a stronger interface effect, thereby achieving a toughening effect. DETAILED DESCRIPTION

[0028] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1 The preparation method of modified silicon dioxide comprises 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 bottle and dispersed evenly, 20g of tetraethyl orthosilicate and 10g of γ-aminopropyltrimethoxysilane were added, the temperature was controlled at 40°C, the reaction was kept warm for 12h under stirring conditions, centrifuged, washed with ethanol, and dried to obtain a pre-product; 1g of the pre-product was mixed with 2mL of 36wt% hydrochloric acid aqueous solution and 150mL of anhydrous ethanol, the temperature was controlled at 50°C, stirred for 3h, washed with anhydrous ethanol, and dried to obtain amino mesoporous silica;

[0031] S2: 1 g of amino-modified mesoporous silica and 50 mL of N,N-dimethylformamide were added to a reaction kettle and dispersed evenly, and 0.5 g of ethylenediaminetetraacetic anhydride was added and dispersed evenly, and the mixture was stirred and reacted at room temperature for 12 h, and then filtered, washed, and dried to obtain component 1;

[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 into a reaction kettle and disperse them evenly. Add 1 g of component 1 and disperse them evenly. Control the temperature at 110°C, keep the reaction warm for 12 hours, centrifuge, wash, dry, crush and sieve to obtain modified silica.

[0033] Example 2 The preparation method of modified silicon dioxide comprises 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 bottle and dispersed evenly, 20g of tetraethyl orthosilicate and 12g of γ-aminopropyltrimethoxysilane were added, the temperature was controlled at 45°C, the reaction was kept warm for 18h under stirring conditions, centrifuged, washed with ethanol, and dried to obtain a pre-product; 1g of the pre-product was blended with 2mL of 36wt% hydrochloric acid aqueous solution and 150mL of anhydrous ethanol, the temperature was controlled at 50°C, stirred for 3h, washed with anhydrous ethanol, and dried to obtain amino mesoporous silica;

[0035] S2: 1 g of amino-modified mesoporous silica and 70 mL of N,N-dimethylformamide were added to a reaction kettle and dispersed evenly, and 0.8 g of ethylenediaminetetraacetic anhydride was added and dispersed evenly, and the mixture was stirred and reacted at room temperature for 18 h, and then filtered, washed, and dried to obtain component 1;

[0036] S3: Add 15 mL of epichlorohydrin, 150 mL of N,N-dimethylformamide, 8 g of potassium iodide and 32 g of potassium fluoride into a reaction kettle and disperse them evenly. Add 1 g of component 1 and disperse them evenly. Control the temperature at 115°C and keep the reaction warm for 12 hours. Centrifuge, wash, dry, crush and sieve to obtain modified silica.

[0037] Example 3 The preparation method of modified silicon dioxide comprises 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 bottle and dispersed evenly, 20g of tetraethyl orthosilicate and 15g of γ-aminopropyltrimethoxysilane were added, the temperature was controlled at 50°C, and the reaction was kept warm for 24h under stirring conditions, centrifuged, washed with ethanol, and dried to obtain a pre-product; 1g of the pre-product was mixed with 2mL of 36wt% hydrochloric acid aqueous solution and 150mL of anhydrous ethanol, the temperature was controlled at 50°C, stirred for 3h, washed with anhydrous ethanol, and dried to obtain amino mesoporous silica;

[0039] S2: 1 g of amino-modified mesoporous silica and 100 mL of N,N-dimethylformamide were added to a reaction kettle and dispersed evenly, and 1 g of ethylenediaminetetraacetic anhydride was added and dispersed evenly, and stirred for reaction at room temperature for 24 h, and then filtered, washed, and dried to obtain component 1;

[0040] S3: Add 20 mL of epichlorohydrin, 200 mL of N,N-dimethylformamide, 10 g of potassium iodide and 35 g of potassium fluoride into a reaction kettle and disperse them evenly. Add 1 g of component 1 and disperse them evenly. Control the temperature at 120°C and keep the reaction warm for 15 hours. Centrifuge, wash, dry, crush and sieve to obtain modified silica.

[0041] Embodiment 4 A method for preparing a polyphenylene sulfide fiber PPS filter bag comprises the following steps:

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

[0043] A2: Melt-blown spinning: The pellets were melt-blown at a spinning speed of 1000 m / min, a melt-blown processing temperature of 330°C, a draw ratio of 4, and a draw temperature of 110°C to obtain polyphenylene sulfide fibers;

[0044] A3: Heat setting: Heat setting the polyphenylene sulfide fiber at 100°C for 2 minutes, 110°C for 3 minutes, and 190°C for 2 minutes;

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

[0046] Embodiment 5 A method for preparing a polyphenylene sulfide fiber PPS filter bag comprises the following steps:

[0047] A1: Blending: 98 g of polyphenylene sulfide (melt temperature 280° C., Mw=55,000) and 2 g of the modified silica prepared in Example 2 were melt-extruded and granulated to obtain granules;

[0048] A2: Melt-blown spinning: The pellets were melt-blown at a spinning speed of 1000 m / min, a melt-blown processing temperature of 330°C, a draw ratio of 4, and a draw temperature of 110°C to obtain polyphenylene sulfide fibers;

[0049] A3: Heat setting: Heat setting the polyphenylene sulfide fiber at 100°C for 2 minutes, 110°C for 3 minutes, and 190°C for 2 minutes;

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

[0051] Embodiment 6 A method for preparing a polyphenylene sulfide fiber PPS filter bag comprises the following steps:

[0052] A1: Blending: 98 g of polyphenylene sulfide (melt temperature 280° C., Mw=55,000) and 2 g of the modified silica prepared in Example 3 were melt-extruded and granulated to obtain pellets;

[0053] A2: Melt-blown spinning: The pellets were melt-blown at a spinning speed of 1000 m / min, a melt-blown processing temperature of 330°C, a draw ratio of 4, and a draw temperature of 110°C to obtain polyphenylene sulfide fibers;

[0054] A3: Heat setting: Heat setting the polyphenylene sulfide fiber at 100°C for 2 minutes, 110°C for 3 minutes, and 190°C for 2 minutes;

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

[0056] Comparative Example 1 The preparation method of modified silicon dioxide comprises the following steps:

[0057] S1: 10 g of nano-silica, 6 g of γ-aminopropyltrimethoxysilane, 10 mL of deionized water, and 90 mL of anhydrous ethanol were added to a reaction kettle, the temperature was controlled at 45°C, the reaction was kept warm for 18 h under stirring conditions, and the reaction was centrifuged, washed, and dried to obtain amino-silica;

[0058] S2: 1 g of amino silica and 70 mL of N,N-dimethylformamide were added to a reaction kettle and dispersed evenly, 0.8 g of ethylenediaminetetraacetic anhydride was added and dispersed evenly, and the mixture was stirred and reacted at room temperature for 18 h, and then filtered, washed, and dried to obtain component 1;

[0059] S3: Add 15 mL of epichlorohydrin, 150 mL of N,N-dimethylformamide, 8 g of potassium iodide and 32 g of potassium fluoride into a reaction kettle and disperse them evenly. Add 1 g of component 1 and disperse them evenly. Control the temperature at 115°C and keep the reaction warm for 12 hours. Centrifuge, wash, dry, crush and sieve to obtain modified silica.

[0060] Comparative Example 2 The preparation method of modified silicon dioxide comprises 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 bottle and dispersed evenly, 20 g of tetraethyl orthosilicate and 15 g of γ-glycidyloxypropyltrimethoxysilane were added, the temperature was controlled at 50°C, and the reaction was kept warm for 24 hours under stirring conditions. The reaction was centrifuged, washed with ethanol, and dried to obtain a pre-product. 1 g of the pre-product was blended with 2 mL of 36 wt% hydrochloric acid aqueous solution and 150 mL of anhydrous ethanol, the temperature was controlled at 50°C, stirred for 3 hours, washed with anhydrous ethanol, and dried to obtain modified silica.

[0062] Comparative Example 3 The preparation method of modified silicon dioxide comprises the following steps:

[0063] 10 g of nano-silica, 6 g of γ-glycidyloxypropyltrimethoxysilane, 10 mL of deionized water and 90 mL of anhydrous ethanol were added into a reaction kettle, the temperature was controlled at 45° C., the reaction was kept warm for 18 h under stirring conditions, and the reaction was centrifuged, washed and dried to obtain modified silica.

[0064] Compared with Example 4, Comparative Example 4 is that only the modified silicon dioxide prepared in Example 1 added in Example 4 is replaced by the modified silicon dioxide prepared in Comparative Example 1 in an equal amount, and the other components and preparation method are completely consistent with Example 4.

[0065] Compared with Example 4, Comparative Example 5 is that only the modified silicon dioxide prepared in Example 1 added in Example 4 is replaced by the modified silicon dioxide prepared in Comparative Example 2 in an equal amount, and the other components and preparation method are completely consistent with Example 4.

[0066] Compared with Example 4, Comparative Example 6 is that only the modified silicon dioxide prepared in Example 1 added in Example 4 is replaced by the modified silicon dioxide prepared in Comparative Example 3 in an equal amount, and the other components and preparation method are completely consistent with Example 4.

[0067] Performance Testing

[0068] (1) Filtration performance: 1000Pa constant pressure spraying for 6 hours, comparing the total emission concentration (TOT) and PM2.5 emission concentration, the test results are shown in Table 1;

[0069] Table 1: Statistical table of filtration performance test data of Examples 4-6 and Comparative Examples 4-6

[0070]

[0071] It can be seen from Table 1 that the pps filter bag prepared in the present application has the characteristics of a smooth and flat surface, has high filtering accuracy and capture effect in practical applications, and exhibits a higher dust removal effect on high-temperature flue gas.

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

[0073] Table 2: Statistical table of mechanical properties test data of Examples 4-6 and Comparative Examples 4-6

[0074]

[0075] It can be seen from Table 2 that the pps filter bag prepared in the present application has good mechanical properties under normal temperature environment; and the material still maintains good mechanical properties after being treated in a high temperature environment. The pps filter bag prepared in the present application is used as an ultra-high temperature dust removal bag material in high-temperature flue gas dust removal filter bags and has stable mechanical strength.

[0076] (3) Thermal oxidation stability: The oxidation induction temperature of the material was measured by differential scanning calorimetry; the specific steps included: 5 mg of the samples prepared in Examples 4-6 and Comparative Examples 4-6 were placed in aluminum crucibles respectively, and the crucibles were placed in a differential scanning calorimeter DSC test chamber produced by Mettler Company, oxygen was purged into the sample at room temperature for 5 min, the heating rate was controlled at 10°C / min and the oxygen rate was 50 mL / min, the temperature was raised from room temperature to 550°C in an oxygen atmosphere, the instrument was cooled to room temperature, and the oxidation induction temperature was calculated by tangent analysis based on the obtained curve. The test results are shown in Table 3;

[0077] (4) Thermal gravimetric performance: A thermal gravimetric analyzer produced by Mettler was used. 10 mg of the samples prepared in Examples 4-6 and Comparative Examples 4-6 were placed in the instrument. The heating rate was controlled at 10° C. / min from room temperature to 600° C. The mass retention rate was calculated. The test results are shown in Table 3.

[0078] Table 3: Statistical table of thermal oxygen stability test data of Examples 4-6 and Comparative Examples 4-6

[0079]

[0080]

[0081] It can be seen from Table 3 that the present application adds modified silica to the PPS filter bag, which effectively improves the material's resistance to thermal oxygen decomposition, and the thermal oxygen weight loss temperature of the modified polyphenylene sulfide is effectively improved. At 600°C in the air, the mass retention rate is as high as 52% or more, and it has excellent thermal oxygen resistance.

[0082] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A polyphenylene sulfide fiber pps filter bag, characterized in that: The preparation method of the pps filter bag comprises the following steps: A1: melt-extrude polyphenylene sulfide and modified silica to obtain pellets; A2: melt-blown spinning, heat setting and hot rolling of the pellets to obtain a pps filter bag; The preparation method of the modified silicon dioxide comprises the following steps: S1: Add polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, deionized water and hydrochloric acid solution into a reaction bottle and disperse them evenly, add tetraethyl orthosilicate and γ-aminopropyltrimethoxysilane, control the temperature at 40-50°C, keep the reaction under stirring for 12-24 hours, centrifuge, wash with ethanol, remove the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, and dry to obtain amino mesoporous silica; S2: adding amino mesoporous silica and N,N-dimethylformamide to a reaction kettle and dispersing them evenly, adding ethylenediaminetetraacetic anhydride and dispersing them evenly, stirring and reacting at room temperature for 12-24 hours, filtering, washing and drying to obtain component 1; S3: Add epichlorohydrin, N,N-dimethylformamide, potassium iodide and potassium fluoride into the reaction kettle and disperse them evenly, add component 1 and disperse them evenly, control the temperature at 110-120°C, keep the reaction warm for 12-15h, centrifuge, wash, dry, crush and sieve to obtain modified silica.

2. A polyphenylene sulfide fiber pps filter bag according to claim 1, characterized in that: 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 1-1.1 g: 5-10 mL: 20-30 mL: 20 g: 10-15 g.

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

4. A 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 10-20mL: 100-200mL: 5-10g: 30-35g: 1g.

5. A polyphenylene sulfide fiber pps filter bag according to claim 1, characterized in that: The modified mesoporous silica accounts for 1.5-2.5% of the total mass of the pellets.

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: extrusion through a twin-screw extruder; during the extrusion process, the melt temperature is 290-320° C. and the screw speed is 190-210 rpm.

7. A polyphenylene sulfide fiber pps filter bag according to claim 1, characterized in that: The spinning speed of melt-blown spinning in A2 is 500-10000 m / min, the melt-blown processing temperature is 330-360°C, the drawing ratio is 3-5, and the drawing temperature is 90-120°C.

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

9. A polyphenylene sulfide fiber pps filter bag according to claim 1, characterized in that: The specific steps of hot rolling in A2 are: hot rolling temperature is 230-280° C., and hot rolling is 20-40 seconds.

10. A polyphenylene sulfide fiber pps filter bag according to claim 1, characterized in that: The pore size of pps filter bag is 1-100um.

Images