CN110975418B - Composite fiber filter material and preparation method thereof - Google Patents
Composite fiber filter material and preparation method thereof Download PDFInfo
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- CN110975418B CN110975418B CN201911308624.9A CN201911308624A CN110975418B CN 110975418 B CN110975418 B CN 110975418B CN 201911308624 A CN201911308624 A CN 201911308624A CN 110975418 B CN110975418 B CN 110975418B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
- B01D2239/0668—The layers being joined by heat or melt-bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
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Abstract
The invention belongs to the technical field of filtering materials for industrial environmental protection and dust removal, and discloses a composite fiber filtering material and a preparation method thereof, wherein the method comprises the steps of carrying out heat setting, surface treatment and heating curing on a composite fiber felt, and then carrying out hot-pressing cladding on the composite fiber felt and a puffed polytetrafluoroethylene microporous membrane; the heating solidification comprises a first heating solidification and a second heating solidification, the second heating solidification is added after the first heating solidification, the fiber felt after surface treatment is subjected to rapid high-temperature sintering, so that active ingredients in treatment liquid are rapidly agglomerated, mixed agglomerated particles with the secondary particle size of 3-8 mu m are formed and are attached to the surface of a filter material, the particle size meets the requirement of structural formula hydrophobicity, meanwhile, the fiber felt is subjected to surface treatment, so that the surface of the filter material has hydrophobic performance, the filter material has the functions of chemical hydrophobicity and structural hydrophobicity, dust is not easy to adhere to the filter material in use, pores are not blocked, the filtering performance of the filter material is effectively improved, and the service life of a dust remover is prolonged.
Description
Technical Field
The invention belongs to the technical field of filtering materials for industrial environment-friendly dust removal, and particularly relates to a composite fiber filtering material and a preparation method thereof.
Background
Energy is an important material basis for the development of economic society and the improvement of the living standard of people, along with the rapid development of economy, the demand of China on the energy is rapidly increased, and serious pollution heavy industries, such as smelting industry and power generation industry, are rapidly developed, most of the industries use coal as a main combustion material, so that serious soot pollution is caused, and the life health of human beings is greatly threatened. China has strict limits on the emission of smoke dust, and the standard is more and more strict. The bag type dust removal has ultrahigh dust removal efficiency, and the dust removal efficiency in practical application can reach 99.99%. The dust emission concentration reaches 10mg/Nm3Some of them reach even 1mg/Nm3Substantially zero emission is achieved. And the dust removal efficiency of the bag type dust collector is slightly influenced by factors such as dust specific resistance, smoke components and smoke quantity which have great influence on the dust removal efficiency, so that the bag type dust collector is widely applied to various industries as an effective means for fine dust emission control. The performance of the filter material as the core of the bag type dust collector is directly related to the performance of the dust collector.
In order to solve the problems of short service life and low filtering effect of a dust remover caused by overhigh smoke temperature and complex components in part of high-temperature smoke filtering industry, the prior art discloses a basalt fiber coated filter material, which is formed by baking basalt fiber bulked yarns after surface treatment and then coating the basalt fiber bulked yarns with a polytetrafluoroethylene membrane in a high-temperature hot-pressing manner.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem of overcoming the defect that when the existing bag type dust collector is used for treating dust-containing gas with large moisture content, dust is easy to adhere to the filter material, so that the filter material pores are blocked, and the filter performance is influenced, thereby providing the preparation method of the composite fiber filter material which is not easy to accumulate and block inside and has high filter efficiency. Meanwhile, the invention also provides the composite fiber filter material prepared by the method.
In order to solve the technical problem, the invention provides a preparation method of a composite fiber filter material, which comprises the steps of carrying out hot setting, surface treatment and heating curing on a composite fiber felt, and then carrying out hot-pressing cladding on the composite fiber felt and an expanded polytetrafluoroethylene microporous membrane;
the heat curing comprises a first heat curing and a second heat curing; the first heating curing temperature is 190-300 ℃ and the time is 5-10 min, and the second heating curing temperature is 300-360 ℃ and the time is 1-5 min; the second heat curing temperature is higher than the first heat curing temperature.
Furthermore, the composite fiber felt takes a woven fabric layer as a reinforcing structure layer, and a first non-woven fabric layer and a second woven fabric layer are respectively arranged on two sides of the woven fabric layer; the pore diameters of the first non-woven fabric layer, the second woven fabric layer and the expanded polytetrafluoroethylene microporous membrane layer are reduced layer by layer; the expanded polytetrafluoroethylene microporous membrane layer is used as the dust facing surface of the composite fiber filter material.
Further, the composite fiber felt also comprises a third non-woven fabric layer, wherein the third non-woven fabric layer is arranged above the second non-woven fabric layer and is connected with the expanded polytetrafluoroethylene microporous membrane layer;
the pore diameter of the third non-woven fabric layer is between the pore diameters of the second non-woven fabric layer and the expanded polytetrafluoroethylene microporous membrane layer.
Furthermore, the aperture of the expanded polytetrafluoroethylene microporous membrane is 0.5-1 μm, the thickness is 3-15 μm, and the air permeability is 4-15 cm/s (127 Pa);
the fiber fineness of the first non-woven fabric layer is 8-12 denier, and the gram weight of the first non-woven fabric layer is 180-300 g/m2；
The second nonwoven fabricThe fiber fineness of the layer is 2-4 denier, and the gram weight of the second non-woven fabric is 100-200 g/m2；
The fiber fineness of the woven fabric layer is 4.5-7.5 denier, and the gram weight of the woven fabric layer is 80-150 g/cm2；
The fiber fineness of the third non-woven fabric layer is 0.5-1.5 denier, and the gram weight of the third non-woven fabric layer is 20-100 g/m2。
Further, the strength of the woven fabric layer in the longitudinal direction and the transverse direction is not less than 750N/50 cm.
Further, the first non-woven fabric layer, the second non-woven fabric layer and the third non-woven fabric layer are formed by uniformly opening, carding, cross-lapping and then needling or spunlacing at least one short-cut fiber of aramid fiber, polyimide fiber or polysulfonamide fiber; the length of the chopped fiber is 3-10 cm;
the woven cloth layer is formed by weaving at least one fiber of polytetrafluoroethylene fibers, aramid fibers, polyimide fibers and aramid fibers.
Further, the heat setting temperature is 210-300 ℃, and the time is 4-10 min.
Further, the surface treatment is to perform surface treatment liquid dipping treatment on the heat-set composite fiber felt, and the surface treatment liquid comprises the following components in parts by weight:
5-30 parts of polytetrafluoroethylene emulsion; 1-3 parts of a silane type coupling agent; 0-30 parts of fluorinated ethylene propylene copolymer emulsion; 0-20 parts of acrylic resin emulsion.
Furthermore, the temperature of the hot-pressing covering is 220-320 ℃, and the pressure is 0.1-1 MPa.
Further, a film covering machine set is adopted for hot-pressing covering; the speed of the film covering unit is 3-20 m/min.
In the invention, the expanded polytetrafluoroethylene microporous membrane is prepared by the following method:
mixing the polytetrafluoroethylene fine particles with a lubricant, and then sequentially carrying out blank making, pushing and extruding, rolling, longitudinal drawing and transverse drawing to form the expanded polytetrafluoroethylene microporous membrane.
The invention also provides a composite fiber filter material prepared by the preparation method.
The technical scheme of the invention has the following advantages:
1. the preparation method of the composite fiber filter material provided by the invention comprises the steps of carrying out heat setting, surface treatment and heating curing on a composite fiber felt, and then carrying out hot-pressing cladding on the composite fiber felt and an expanded polytetrafluoroethylene microporous membrane; the heating and curing process comprises a first heating and curing process and a second heating and curing process, wherein the second heating and curing process comprises heating at 300-360 ℃ for 1-5 min, the second heating and curing process is added after the first heating and curing process, the composite fiber felt after surface treatment is subjected to rapid high-temperature sintering, so that active ingredients in a treating agent are rapidly agglomerated, mixed agglomerated particles with the secondary particle size of 3-8 mu m are formed and attached to the surface of a filter material, the particle size meets the requirement of structural hydrophobic property, meanwhile, the composite fiber felt is subjected to surface treatment, so that the surface of the filter material has hydrophobic property, the filter material has the functions of chemical hydrophobic property and structural hydrophobic property, dust is not easy to adhere to the filter material in use, pores are not blocked, dust is easy to remove, the filtering property of the filter material is effectively improved, and the service life of a bag type dust remover is prolonged.
2. According to the preparation method of the composite fiber filter material, the expanded polytetrafluoroethylene microporous membrane is used as the dust facing surface of the composite fiber filter material, the expanded polytetrafluoroethylene microporous membrane has expanded micropores, a multi-node and multi-layer wire drawing net structure, and the multi-layer staggered space net structure can effectively intercept most dust and improve the dust filtering efficiency. The third non-woven fabric layer is arranged below the expanded polytetrafluoroethylene microporous membrane layer and is a superfine fiber layer formed by chopped fibers with the fiber fineness of 0.5-1.5 denier, the secondary dust interception function of the filter material is enhanced, and the third non-woven fabric layer is combined with the expanded polytetrafluoroethylene membrane layer, so that the conversion from deep filtration to surface filtration is realized, the dust interception stability of the filter material is ensured, and multiple guarantee is provided for ultralow emission of dust. In addition, the aperture of the composite fiber filter material provided by the invention is enlarged layer by layer from the dust facing surface to the air purifying surface to form a channel similar to a bell mouth, so that the dust in the composite fiber filter material is further prevented from gathering and blocking, the emission requirement is ensured, and the service life of the filter material is prolonged.
3. According to the preparation method of the composite fiber filter material, the polytetrafluoroethylene emulsion impregnation treatment is carried out on the composite fiber felt after heat setting, so that the hydrophobic property of the surface of the filter material is improved, dust is not easy to adhere in use, and the filtering efficiency is improved; meanwhile, the obtained filter material product has good heat-resistant and corrosion-resistant properties.
4. The composite fiber filter material provided by the invention has excellent mechanical properties, the warp and weft strength is greater than 1300N/50cm, and the warp and weft elongation at break is lower than 30%. Moreover, the composite filter material can be used for a long time at the high temperature of 300 ℃, has strong air permeability and waterproof performance, the waterproof performance reaches 5 grades, the filtering efficiency of ultrafine dust can reach 99.9995 percent, the lower running resistance and the longer service life of the filter material are ensured, and the composite filter material can be widely applied to high-temperature and high-humidity environments which cannot be reached by common filter materials.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a composite fiber filter material according to example 1 of the present invention;
description of reference numerals:
1-a polytetrafluoroethylene microporous membrane layer; 2-a third nonwoven layer; 3-a second nonwoven layer; 4-weaving a cloth layer; 5-a first nonwoven layer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. 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. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment provides a composite fiber filter material, the structure of which is shown in fig. 1, the composite fiber filter material has a five-layer structure, and comprises a bulked polytetrafluoroethylene microporous membrane layer 1, a third non-woven fabric layer 2, a second non-woven fabric layer 3, a woven fabric layer 4 and a first non-woven fabric layer 5 which are sequentially stacked together, wherein the bulked polytetrafluoroethylene microporous membrane layer 1 is a dust-facing surface layer.
In this embodiment, the third nonwoven fabric layer 2 is an ultra-fine aramid nonwoven fabric layer, the second nonwoven fabric layer 3 is a conventional polyimide nonwoven fabric layer, the woven fabric layer 4 is an aramid plain woven fabric layer, and the first nonwoven fabric layer 5 is a conventional polyimide nonwoven fabric layer. The preparation method comprises the following steps:
(1) preparation of the first nonwoven layer 5: polyimide fibers with the length of 10cm and the fineness of 12 denier are uniformly opened and carded to form a single-layer fiber web, and then the single-layer fiber web is subjected to multi-layer lapping and needling to form the single-layer fiber web with the gram weight of 300g/m2Conventional polyimide fiber nonwoven fabric of (1);
preparation of woven fabric layer 4: aramid fiber with the fineness of 7.5 denier is spun to form the aramid fiber with the gram weight of 150g/cm2The aramid fiber plain woven fabric of (1);
preparation of the second nonwoven layer 3: polyimide fibers with the length of 5cm and the fineness of 4 denier are uniformly opened and carded to form a single-layer fiber net, and then the single-layer fiber net is subjected to multi-layer lapping and needling to form the single-layer fiber net with the gram weight of 200g/m2Conventional polyimide fiber nonwoven fabric of (1);
preparation of the third nonwoven layer 2: aramid fiber with the length of 3cm and the fineness of 1.5 denier is uniformly opened and carded to form a single-layer fiber net, and then the single-layer fiber net is subjected to multi-layer lapping and needling to form the aramid fiber net with the gram weight of 100g/m2The superfine aramid fiber non-woven fabric;
(2) superposing the third non-woven fabric layer 2, the second non-woven fabric layer 3, the woven fabric layer 4 and the first non-woven fabric layer 5 in sequence and then needling to obtain a composite needled fiber felt;
(3) heat setting the composite needled fiber felt at 220 ℃ for 5min, then soaking the composite needled fiber felt in a surface treatment solution formed by 30 wt% of polytetrafluoroethylene emulsion, 3 wt% of silane type coupling agent, 30 wt% of fluorinated ethylene propylene copolymer emulsion, 20% of acrylic resin emulsion and the balance of water, taking out the composite needled fiber felt after the soaking is finished, and baking the composite needled fiber felt at 240 ℃ for 5 min; then rapidly sintering for 2min at 320 ℃;
(4) and (3) carrying out hot-pressing and laminating on the cured composite needled fiber felt and an expanded polytetrafluoroethylene microporous membrane with the aperture of 1 mu m and the thickness of 15 mu m by a laminating machine set under the conditions of 320 ℃, the pressure of 0.2MPa and the vehicle speed of 8m/min to obtain the composite fiber filter material.
Example 2
This example provides a composite fiber filter material having the same structure as the composite fiber filter material in example 1. The preparation method comprises the following steps:
(1) preparation of the first nonwoven layer 5: polyimide fibers with the length of 7cm and the fineness of 10 denier are uniformly opened and carded to form a single-layer fiber net, and then the single-layer fiber net is subjected to multi-layer lapping and needling to form the single-layer fiber net with the gram weight of 240g/m2Conventional polyimide fiber nonwoven fabric of (1);
preparation of woven fabric layer 4: aramid fiber with the fineness of 6 deniers is spun to form the aramid fiber with the gram weight of 120g/cm2The aramid fiber plain woven fabric of (1);
preparation of the second nonwoven layer 3: polyimide fibers with the length of 7cm and the fineness of 3 denier are uniformly opened and carded to form a single-layer fiber net, and then the single-layer fiber net is subjected to multi-layer lapping and needling to form the polyimide fiber net with the gram weight of 150g/m2Conventional polyimide fiber nonwoven fabric of (1);
preparation of the third nonwoven layer 2: polyimide fibers with the length of 5cm and the fineness of 1 denier are uniformly opened and carded to form a single-layer fiber net, and then the single-layer fiber net is subjected to multi-layer lapping and needling to form the single-layer fiber net with the gram weight of 100g/m2The superfine aramid fiber non-woven fabric;
(2) superposing the third non-woven fabric layer 2, the second non-woven fabric layer 3, the woven fabric layer 4 and the first non-woven fabric layer 5 in sequence and then needling to obtain a composite needled fiber felt;
(3) heat setting the composite needled fiber felt at 230 ℃ for 5min, then soaking the composite needled fiber felt in a surface treatment solution formed by 20 wt% of polytetrafluoroethylene emulsion, 2 wt% of silane type coupling agent, 15 wt% of fluorinated ethylene propylene copolymer emulsion, 20% of acrylic resin emulsion and the balance of water, taking out the composite needled fiber felt after the soaking is finished, and baking the composite needled fiber felt at 230 ℃ for 5 min; then rapidly sintering for 3min at 330 ℃;
(4) and (3) carrying out hot-pressing and laminating on the cured composite needled fiber felt and an expanded polytetrafluoroethylene microporous membrane with the aperture of 0.8 mu m and the thickness of 9 mu m by a laminating machine set under the conditions of 310 ℃, the pressure of 0.25MPa and the vehicle speed of 10m/min to obtain the composite fiber filter material.
Example 3
This example provides a composite fiber filter material having the same structure as the composite fiber filter material in example 1. The preparation method comprises the following steps:
(1) preparation of the first nonwoven layer 5: polyimide fibers with the length of 10cm and the fineness of 8 denier are uniformly opened and carded to form a single-layer fiber net, and then the single-layer fiber net is subjected to multi-layer lapping and needling to form a fiber net with the gram weight of 180g/m2Conventional polyimide fiber nonwoven fabric of (1);
preparation of woven fabric layer 4: the polysulfonamide fiber with the fineness of 4.5 denier is spun to form the weight per gram of 80g/cm2The polysulfonamide fiber plain woven fabric;
preparation of the second nonwoven layer 3: uniformly opening and carding 7cm long polysulfonamide fiber with fineness of 2 denier to form a single-layer fiber web, laying the single-layer fiber web in multiple layers, and needling the single-layer fiber web to form the polysulfonamide fiber web with the gram weight of 100g/m2Conventional polysulfonamide fiber nonwovens;
preparation of the third nonwoven layer 2: aramid fiber with the length of 5cm and the fineness of 0.5 denier is uniformly opened and carded to form a single-layer fiber net, and then the single-layer fiber net is subjected to multi-layer lapping and needling to form the aramid fiber net with the gram weight of 20g/m2The superfine aramid fiber non-woven fabric;
(2) the third non-woven fabric layer 2, the second non-woven fabric layer 3, the woven fabric layer 4 and the first non-woven fabric layer 5 are sequentially superposed and then subjected to spunlace to obtain a composite needled fiber felt;
(3) heat-setting the composite needled fiber felt at 210 ℃ for 10min, then soaking the composite needled fiber felt in a surface treatment solution formed by 5 wt% of polytetrafluoroethylene emulsion, 1 wt% of silane type coupling agent, 10 wt% of fluorinated ethylene-propylene copolymer emulsion, 10% of acrylic resin emulsion and the balance of water, taking out the composite needled fiber felt after the soaking is finished, and baking the composite needled fiber felt at 190 ℃ for 10 min; then rapidly sintering at 300 ℃ for 5 min;
(4) and (3) carrying out hot-pressing and laminating on the cured composite needled fiber felt and an expanded polytetrafluoroethylene microporous membrane with the aperture of 0.5 mu m and the thickness of 3 mu m by a laminating machine set under the conditions of 220 ℃, the pressure of 1MPa and the vehicle speed of 3m/min to obtain the composite fiber filter material.
Example 4
This example provides a composite fiber filter material having the same structure as the composite fiber filter material in example 1. The preparation method comprises the following steps:
(1) preparation of the first nonwoven layer 5: polyimide fibers with the length of 10cm and the fineness of 12 denier are uniformly opened and carded to form a single-layer fiber web, and then the single-layer fiber web is subjected to multi-layer lapping and needling to form the single-layer fiber web with the gram weight of 300g/m2Conventional polyimide fiber nonwoven fabric of (1);
preparation of woven fabric layer 4: the polytetrafluoroethylene fiber with the fineness of 7.5 denier is spun to form the polytetrafluoroethylene fiber with the gram weight of 150g/cm2The polytetrafluoroethylene fiber plain woven fabric;
preparation of the second nonwoven layer 3: polyimide fibers with the length of 5cm and the fineness of 4 denier are uniformly opened and carded to form a single-layer fiber net, and then the single-layer fiber net is subjected to multi-layer lapping and needling to form the single-layer fiber net with the gram weight of 200g/m2Conventional polyimide fiber nonwoven fabric of (1);
preparation of the third nonwoven layer 2: aramid fiber with the length of 3cm and the fineness of 1.5 denier is uniformly opened and carded to form a single-layer fiber net, and then the single-layer fiber net is subjected to multi-layer lapping and needling to form the aramid fiber net with the gram weight of 100g/m2Is ultra-fineAramid fiber non-woven fabric;
(2) superposing the third non-woven fabric layer 2, the second non-woven fabric layer 3, the woven fabric layer 4 and the first non-woven fabric layer 5 in sequence and then needling to obtain a composite needled fiber felt;
(3) heat setting the composite needled fiber felt at 300 ℃ for 4min, soaking the composite needled fiber felt in a surface treatment liquid formed by 5 wt% of polytetrafluoroethylene emulsion, 1 wt% of silane type coupling agent and the balance of water, taking out the composite needled fiber felt after the soaking is finished, and baking the composite needled fiber felt at 300 ℃ for 5 min; then rapidly sintering at 360 ℃ for 1 min;
(4) and (3) carrying out hot-pressing and laminating on the cured composite needled fiber felt and an expanded polytetrafluoroethylene microporous membrane with the aperture of 0.8 mu m and the thickness of 10 mu m by a laminating machine set under the conditions of 320 ℃, the pressure of 0.1MPa and the speed of 20m/min to obtain the composite fiber filter material.
Example 5
The embodiment provides a composite fiber filter material, and this composite fiber filter material has four-layer structure, including popped polytetrafluoroethylene micropore rete 1, second non-woven fabrics layer 3, woven fabrics layer 4 and first non-woven fabrics layer 5 that superpose together in proper order, wherein popped polytetrafluoroethylene micropore rete 1 is the dust facing side layer. The preparation method is basically the same as that of example 2.
Comparative example 1
The comparative example provides a composite fiber filter material, the structure of which is the same as that of the composite fiber rate material in example 1, and the preparation method of the composite fiber filter material is basically the same as that of example 2, except that in the comparative example, the impregnated composite needled fiber felt is baked at 230 ℃ for 5min and then is subjected to hot-pressing lamination with the expanded polytetrafluoroethylene microporous membrane.
Experimental example 1
The composite fiber filter materials of examples 1-5 and comparative example 1 of the invention were tested for performance according to the test standards of GB/T6719-2009, HJ/T324-2006 and GB/T4745-.
TABLE 1 results of performance tests on different composite fiber filter materials
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. The preparation method of a composite fiber filter material is characterized in that a composite fiber felt is subjected to heat setting, surface treatment and heating curing, and then is subjected to hot-pressing lamination with an expanded polytetrafluoroethylene microporous membrane layer;
the heat curing comprises a first heat curing and a second heat curing; the first heating curing temperature is 190-300 ℃ and the time is 5-10 min, and the second heating curing temperature is 300-360 ℃ and the time is 1-5 min; the temperature of the second heat curing is higher than the temperature of the first heat curing;
the composite fiber felt takes a woven fabric layer as a reinforcing structure layer, and a first non-woven fabric layer and a second non-woven fabric layer are respectively arranged on two sides of the woven fabric layer;
the composite fiber felt also comprises a third non-woven fabric layer, wherein the third non-woven fabric layer is arranged above the second non-woven fabric layer and is connected with the expanded polytetrafluoroethylene microporous membrane layer;
the heat setting temperature is 210-300 ℃, and the time is 4-10 min;
the surface treatment is to perform surface treatment liquid dipping treatment on the heat-set composite fiber felt, and the surface treatment liquid comprises the following components in parts by weight:
5-30 parts of polytetrafluoroethylene emulsion; 1-3 parts of a silane type coupling agent; 0-30 parts of fluorinated ethylene propylene copolymer emulsion; 0-20 parts of acrylic resin emulsion.
2. The preparation method of the composite fiber felt according to claim 1, wherein a woven fabric layer is used as a reinforcing structure layer, and a first non-woven fabric layer and a second non-woven fabric layer are respectively arranged on two sides of the woven fabric layer; the pore diameters of the first non-woven fabric layer, the second non-woven fabric layer and the polytetrafluoroethylene microporous membrane layer are reduced layer by layer; the expanded polytetrafluoroethylene microporous membrane layer is used as the dust facing surface of the composite fiber filter material.
3. The method of claim 2, wherein the composite fiber mat further comprises a third nonwoven layer disposed over the second nonwoven layer and interfacing with the expanded polytetrafluoroethylene microporous membrane layer;
the pore diameter of the third non-woven fabric layer is between the pore diameters of the second non-woven fabric layer and the expanded polytetrafluoroethylene microporous membrane layer.
4. The preparation method of claim 3, wherein the pore diameter of the expanded polytetrafluoroethylene microporous membrane layer is 0.5-1 μm, and the thickness is 3-15 μm;
the fiber fineness of the first non-woven fabric layer is 8-12 denier, and the gram weight of the first non-woven fabric layer is 180-300 g/m2；
The fiber fineness of the second non-woven fabric layer is 2-4 deniers, and the gram weight of the second non-woven fabric layer is 100-200 g/m2；
The fiber fineness of the woven fabric layer is 4.5-7.5 denier, and the gram weight of the woven fabric layer is 80-150 g/cm2；
The fiber fineness of the third non-woven fabric layer is 0.5-1.5 denier, and the gram weight of the third non-woven fabric layer is 20-100 g/m2。
5. The preparation method according to claim 3 or 4, characterized in that the first non-woven fabric layer, the second non-woven fabric layer and the third non-woven fabric layer are prepared by uniformly opening, carding, cross-lapping and then needling or hydro-entangling at least one chopped fiber selected from aramid fiber, polyimide fiber and polysulfonamide fiber; the length of the chopped fiber is 3-10 cm;
the woven cloth layer is formed by weaving at least one fiber of polytetrafluoroethylene fibers, aramid fibers and polyimide fibers.
6. The method according to any one of claims 1 to 4, wherein the temperature of the thermocompression bonding is 220 to 320 ℃ and the pressure is 0.1 to 1 MPa.
7. The production method according to any one of claims 1 to 4, wherein the hot press-coating is performed by a laminator; the speed of the film covering unit is 3-20 m/min.
8. A composite fibrous filter material prepared according to the method of any one of claims 1 to 7.
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| PCT/CN2020/087322 WO2021120484A1 (en) | 2019-12-18 | 2020-04-27 | Complex fiber filter material and preparation method therefor |
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|---|---|---|---|---|
| CN110975418B (en) * | 2019-12-18 | 2021-08-17 | 南京玻璃纤维研究设计院有限公司 | Composite fiber filter material and preparation method thereof |
| CN112221257B (en) * | 2020-09-29 | 2022-04-22 | 江苏恒生环保科技有限公司 | Seamless cylindrical filter bag and manufacturing method thereof |
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| CN110975418A (en) | 2020-04-10 |
| WO2021120484A1 (en) | 2021-06-24 |
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