CN114164561A - Preparation method of polysulfonamide electret high-temperature filter material - Google Patents
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- 238000000034 method Methods 0.000 claims abstract description 24
- 239000002131 composite material Substances 0.000 claims abstract description 19
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- 238000005345 coagulation Methods 0.000 claims abstract description 3
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- 239000011148 porous material Substances 0.000 claims description 11
- 125000003118 aryl group Chemical group 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- 229920002492 poly(sulfone) Polymers 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 12
- 239000007924 injection Substances 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 9
- 238000007664 blowing Methods 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 abstract description 2
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- 238000009776 industrial production Methods 0.000 description 1
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4326—Condensation or reaction polymers
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/559—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving the fibres being within layered webs
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
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- D—TEXTILES; PAPER
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- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2505/00—Industrial
- D10B2505/04—Filters
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Abstract
The invention discloses a double-layer composite fiber which is prepared and obtained by a pre-filtering layer and a main filtering layer, wherein the fiber diameter of the pre-filtering layer is distributed between 3 and 10 mu m; the fiber diameter of the main filter layer is distributed between 1 um and 5 um; and then, performing electrode injection on the double-layer composite fibers to obtain an polysulfonamide electret high-temperature filter material product, wherein the pre-filter layer and the main filter layer are prepared by adopting a double-spinneret plate melt-blowing process, the pre-filter layer and the main filter layer are respectively extruded by adopting double-spinneret plates, and the superfine fibers extruded from the two spinneret plates are formed into a net on a coagulation net curtain with a certain time difference, so that the double-layer composite fibers with different silk diameter distributions are formed. The polysulfonamide high-temperature electret filter material has the advantages of extremely high electret charge stability, excellent filtering efficiency, long service life, wide application and wide adaptability.
Description
Technical Field
The invention belongs to the technical field of polymer filter materials, and particularly relates to a preparation method of an polysulfonamide electret high-temperature filter material.
Background
With the development of modern industry, harmful gases such as high-temperature flue gas dust SOx, NOx emitted in the industrial production process cause harm to the environment and human health, even endanger life.
At present, materials for high-temperature filtration mainly have the problems of large fabric pore size, loose structure, poor filtering effect on small-particle-size smoke dust particles, low dust removal efficiency, short service life in a high-temperature environment, frequent replacement of filter bags and the like.
The demand of China for high-temperature resistant fibers is also increased year by year, but many key technologies of the high-temperature resistant fibers in the beginning stage of China are monopolized by foreign companies. The urgent need of our today is the development of high temperature resistant filter materials.
The polysulfonamide (PSA fiber) has excellent heat-resistant flame-retardant filtering performance, excellent physical and mechanical properties and excellent chemical stability. The PSA fiber has the long-term use temperature of 250 ℃, the strength retention rate of more than 80 percent after 100h heating and the Limiting Oxygen Index (LOI) of 33 percent, meets the basic performance requirements of the fiber raw material for the high-temperature-resistant filter material, and the polysulfonamide has less application in the field of high-temperature flue gas purification.
In order to improve the filtering efficiency on the premise of unchanging the filtering resistance of the polysulfonamide, the polysulfonamide melt-blown filtering material can be subjected to electret treatment to charge the fibers of the polysulfonamide melt-blown filtering material, and a unique electrostatic filtering mechanism is utilized to filter tiny particles in air.
Disclosure of Invention
The invention provides a preparation method of an polysulfonamide electret high-temperature filter material aiming at the problems in the prior art.
The invention solves the technical problems through the following technical means:
firstly, preparing a double-layer composite fiber consisting of a pre-filtering layer and a main filtering layer, wherein the fiber diameter of the pre-filtering layer is distributed between 3 and 10 mu m; the fiber diameter of the main filter layer is distributed between 1 um and 5 um; and then the double-layer composite fiber is subjected to pole injection to obtain the polysulfonamide electret high-temperature filter material product.
The pre-filtering layer and the main filtering layer are prepared by adopting a double-spinneret melt-blowing process, the pre-filtering layer and the main filtering layer are respectively extruded by adopting double-spinneret plates, and superfine fibers extruded from the two spinneret plates are formed into a net on a coagulation net curtain with a certain time difference, so that double-layer composite fibers with different silk diameter distributions are formed.
The diameter of the aperture of a spinneret plate of the pre-filtering layer is 0.4-0.6 um, and the length-diameter ratio is 6-12; the diameter of the pore diameter of a spinneret plate of the main filtering layer is 0.1-0.4 um, and the length-diameter ratio is 10-17, so that the fiber diameter size requirements of the pre-filtering layer and the main filtering layer under the process control condition are met.
And (3) performing electrode injection on the double-layer composite fiber by adopting a corona discharge method or an electrical breakdown polarization method, wherein when the corona discharge method is adopted for performing electret, the electret voltage is 20-30 KV at the positive electrode, 10-30 KV at the negative electrode, the electret distance is 2-5cm, and the electret time is 1-4 min.
The obtained polysulfonamide double-layer composite fiber has the gram weight of 50-200 g per square meter and the thickness of 0.50-1.50 mm.
The invention has the beneficial effects that: the electret filtering mechanism of the polysulfonamide is the combination of electrostatic effect and non-electrostatic effect, and the electrostatic filtering is realized by adsorbing tiny particles through an electric field formed by charges deposited on fibers. Meanwhile, the pores among the fibers enable the material to realize mechanical filtering effect through direct capture, inertial deposition, diffusion effect, gravity effect and the like, and the method is an effective method for realizing high efficiency and low resistance of the filter material. The polysulfonamide high-temperature electret filter material has the advantages of extremely high electret charge stability, excellent filtering efficiency, long service life, wide application and wide adaptability.
Drawings
Fig. 1 is a schematic diagram of a corona discharge method.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The preparation method of the polysulfonamide electret high-temperature filter material specifically comprises the following steps:
the method comprises the following steps: the diameter of the pore diameter of a spinneret plate provided with the pre-filtering layer is 0.4-0.6 um, and the length-diameter ratio is 6-12; the diameter of the pore diameter of a spinneret plate provided with the main filter layer is 0.1-0.4 um, and the length-diameter ratio is 10-17; the superfine fibers are extruded to the condensing net curtain at intervals by utilizing a melt-blowing process to control two spinneret plates, so that a pre-filtering layer with the fiber diameter distributed between 3 and 10 mu m and a main filtering layer with the fiber diameter distributed between 1 and 5 mu m are formed, and the pre-filtering layer and the main filtering layer jointly form the polysulfonamide double-layer composite fiber;
step two: referring to fig. 1, the polysulfonamide double-layer composite fiber is electret by a corona discharge method, the voltage of the electret is 20-30 KV, the voltage of the cathode is 10-30 KV, the electret distance is 2-5cm, and the electret time is 1-4 min.
The following description will be given with reference to specific examples.
Example 1
(1) Preparing a double-layer composite fiber consisting of an polysulfonamide fiber pre-filtering layer and a main filtering layer by adopting a melt-blowing process, wherein the fiber diameter of the pre-filtering layer is distributed between 3 and 10 mu m; the fiber diameter of the main filter layer is distributed between 1 and 5 mu m; the pre-filtering layer and the main filtering layer are respectively extruded by double spinneret plates, the diameter of the aperture of the spinneret plate of the pre-filtering layer is 0.4um, and the length-diameter ratio is 8; the diameter of the pore diameter of a spinneret plate of the main filter layer is 0.2um, and the length-diameter ratio is 13.
(2) Then, performing plate injection on the double-layer composite fiber to obtain a product; adopting a corona electret method, selecting 25KV for positive pole and 20KV for negative pole of the injection plate voltage, setting the injection plate distance at 2.5cm, and carrying out electret time for 3 min.
Example 2
(1) Preparing a double-layer composite fiber consisting of an polysulfonamide fiber pre-filtering layer and a main filtering layer by adopting a melt-blowing process, wherein the fiber diameter of the pre-filtering layer is distributed between 3 and 10 mu m; the fiber diameter of the main filter layer is distributed between 1 and 5 mu m; the pre-filtering layer and the main filtering layer are respectively extruded by double spinneret plates, the diameter of the aperture of the spinneret plate of the pre-filtering layer is 0.5 mu m, and the length-diameter ratio is 7; the diameter of the pore diameter of a spinneret plate of the main filter layer is 0.3um, and the length-diameter ratio is 13.
(2) Then injecting the double-layer composite fiber to obtain a product; a corona electret method is adopted, the anode of the voltage of the injection plate is 30KV, the cathode of the voltage of the injection plate is 25KV, the distance of the injection plate is 3.0cm, and the electret time is 1.5 min.
Example 3
(1) Preparing a double-layer composite fiber consisting of an polysulfonamide fiber pre-filtering layer and a main filtering layer by adopting a melt-blowing process, wherein the fiber diameter of the pre-filtering layer is distributed between 3 and 10 mu m; the fiber diameter of the main filter layer is distributed between 1 and 5 mu m; the pre-filtering layer and the main filtering layer are respectively extruded by double spinneret plates, the diameter of the aperture of the spinneret plate of the pre-filtering layer is 0.5 mu m, and the length-diameter ratio is 6; the diameter of the pore diameter of a spinneret plate of the main filter layer is 0.3um, and the length-diameter ratio is 12.
(2) Then, performing plate injection on the double-layer composite fiber to obtain a product; adopting a corona electret method, selecting 25KV for positive pole and 25KV for negative pole of the injection plate voltage, setting the injection plate distance at 2.0cm, and carrying out electret time for 2 min.
The heat resistance of the polysulfonamide filter material is detected according to a test method for detecting the heat resistance of the filter material in HCRJ 042-1999 (appendix E). Table 1 shows the heat resistance test results and standard reaching conditions of the polysulfonamide filter materials at a high temperature of 250 ℃.
| Inspection item | Example 1 | Example 2 | Example 3 | Index requirement |
| Strength retention after heating at 250 ℃ for 24 h% | 110.2 | 115.2 | 113.2 | ≥95 |
| Strength retention after heating at 250 ℃ for 72 h% | 106.0 | 109.0 | 107.0 | ≥90 |
| Strength retention after heating at 250 ℃ for 100 h/%) | 110.0 | 114.0 | 112.1 | ≥80 |
Table 1: heat resistance test result and standard reaching condition of polysulfonamide electret high-temperature filter material
Table 2 shows the filtration performance test data of the polysulfonamide electret high-temperature filter material. When the atmospheric dust is used as an experimental dust source, an atmospheric dust counter is used for measuring the filtering efficiency of the filtering material. The ratio of the difference between the count concentration at the upstream side and the count concentration at the downstream side to the count concentration at the upstream side is the atmospheric dust count filtration efficiency of the filter medium under test, and is expressed as a percentage.
In the formula (I); pi-counting efficiency of particle size grouping (not less than 0.5um, not less than 1.0um. not less than 2.0um, not less than 5.0 um);
n1 i-average value of the number concentration of particles having a certain particle diameter or more on the windward side (particle/L);
n2 i-average value of the number concentration of particles having a particle diameter on the leeward side or more (particle/L).
Table 2: filtration performance test data of polysulfonamide electret high-temperature filter material
| Test item/250 deg.C | Air permeability/m.s-1 | Increase rate/%) | Air permeability/m3·m-2·min-1 |
| Example 1 | 0.400 | 2.60 | 24.64 |
| Example 2 | 0.415 | 2.65 | 24.88 |
| Example 3 | 0.425 | 2.77 | 25.06 |
Table 3: air permeability test data of polysulfonamide electret high-temperature filter material
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. The preparation method of the polysulfonamide electret high-temperature filter material is characterized by sequentially comprising the following steps of:
s1 preparation of filter material: extruding and molding polysulfonamide double-layer composite fibers comprising a pre-filtering layer and a main filtering layer on a coagulation net curtain at intervals by using double spinneret plates with spinneret pore size difference, wherein the fiber diameter of the pre-filtering layer is 3-10 microns, and the fiber diameter of the main filtering layer is 1-5 microns;
s2 electret: aromatic polysulphone double-layer composite fiber electret.
2. The preparation method of the polysulfonamide electret high-temperature filter material as claimed in claim 1, wherein the diameter of the pore diameter of the spinneret plate of the pre-filter layer is 0.4-0.6 um, the length-diameter ratio is 6-12, and the diameter of the pore diameter of the spinneret plate of the main filter layer is 0.1-0.4 um, and the length-diameter ratio is 10-17.
3. The preparation method of the polysulfonamide electret high-temperature filter material as claimed in claim 1, wherein the S2 electret adopts a corona discharge method, the voltage of the electret is 20-30 KV, the voltage of the cathode is 10-30 KV, the distance of the electret is 2-5cm, and the electret time is 1-4 min.
4. The preparation method of the polysulfonamide electret high-temperature filter material as claimed in claim 1, wherein the polysulfonamide double-layer composite fiber has a grammage of 50-200 g and a thickness of 0.50-1.50 mm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101125267A (en) * | 2007-06-12 | 2008-02-20 | 桐乡市健民过滤材料有限公司 | Electret air filtering material |
| JP2008221074A (en) * | 2007-03-09 | 2008-09-25 | Toyobo Co Ltd | Electret filter medium and its manufacturing method |
| WO2015017795A2 (en) * | 2013-08-02 | 2015-02-05 | Cummins Filtration Ip, Inc. | Gradient nanofiber filter media |
| CN111235863A (en) * | 2020-03-12 | 2020-06-05 | 上海市纺织科学研究院有限公司 | Preparation method of polysulfonamide electret filter material |
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- 2021-11-04 CN CN202111300157.2A patent/CN114164561A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008221074A (en) * | 2007-03-09 | 2008-09-25 | Toyobo Co Ltd | Electret filter medium and its manufacturing method |
| CN101125267A (en) * | 2007-06-12 | 2008-02-20 | 桐乡市健民过滤材料有限公司 | Electret air filtering material |
| WO2015017795A2 (en) * | 2013-08-02 | 2015-02-05 | Cummins Filtration Ip, Inc. | Gradient nanofiber filter media |
| CN111235863A (en) * | 2020-03-12 | 2020-06-05 | 上海市纺织科学研究院有限公司 | Preparation method of polysulfonamide electret filter material |
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Application publication date: 20220311 |