CN213725293U - Filter material substrate and ultra-clean high-flux filter material - Google Patents
Filter material substrate and ultra-clean high-flux filter material Download PDFInfo
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- CN213725293U CN213725293U CN202021998138.2U CN202021998138U CN213725293U CN 213725293 U CN213725293 U CN 213725293U CN 202021998138 U CN202021998138 U CN 202021998138U CN 213725293 U CN213725293 U CN 213725293U
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Abstract
The utility model relates to a filter material substrate and super clean high flux filter material, wherein, the filter material substrate includes thin fibrous layer, base cloth layer and the thick fibrous layer that sets gradually by the dust-facing side of the body dust face, form each other between thin fibrous layer, fibrous layer and the base cloth layer, between base cloth layer and the thick fibrous layer and inlay the structure. The utility model discloses set up the multilayer structure substrate into three-dimensional each other and inlay asymmetric structure substrate, eliminated interlaminar "interface effect" almost, reduced the running resistance to but selected a degree of depth fibrillation polytetrafluoroethylene microporous membrane, this type of membrane flux is big, and the aperture is moderate, can improve the porosity during degree of depth fibrillation, and the tectorial membrane filter material aperture that forms compares the aperture of membrane and becomes littleer, thereby improves air permeability, further reduces the running resistance.
Description
Technical Field
The utility model relates to a high-tech fiber filters and separation material technical field, concretely relates to filter material substrate, super clean high flux filter material can be fit for being used in old bag-type (electricity bag is compound) dust pelletizing system and reform transform into super clean emission or require super clean emission and have the newly-built bag-type dust pelletizing system of clear and definite energy-conserving index.
Background
In recent years, air pollution of various cities in China is more and more serious, the requirement of the nation on air treatment is more and more strict, and ultra-clean emission (10 mg/Nm) has been comprehensively carried out on the emission standard of industrial smoke dust3Even 5 mg/Nm3) The high-tech fiber filtering and separating material is one kind of core material for treating industrial fumeWith the continuous improvement of the emission requirements, the requirements on the material products are higher and higher.
The structure of the existing ultra-clean filtering and separating material product mainly comprises a high gram weight (more than 600g/m 2) needle-punched filter material, a spunlace filter material and a membrane-covered filter material product. The high gram weight needle punched filter material has high cost and high running resistance; the spunlace filter material has high production cost and high running resistance; the air permeability interval of the existing membrane-coated filter material is 20-50L/dm2 × min, and the actually produced membrane-coated filter material is generally less than 35L/dm2Min at 20-30L/dm2The interval of the min area is a little more, the aperture of the conventional membrane filter material is slightly increased compared with that of the conventional membrane, and the conventional membrane filter material has high-efficiency filtering performance of surface filtration, but the flux is a little smaller, so that the whole running resistance is kept to run at a relatively high position.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a filter material substrate, super clean high flux filter material and preparation method thereof, it can improve the flux of filter material, reduces the running resistance.
In order to achieve the above object, the utility model adopts the following technical scheme:
a filter material base material comprises a fine fiber layer, a base cloth layer and a coarse fiber layer which are sequentially arranged from a dust-facing surface to a dust-backing surface, wherein a mutual embedding structure is formed among the fine fiber layer, the fiber layer and the base cloth layer, and between the base cloth layer and the coarse fiber layer.
The gram weight of the filter material substrate is 500-600g/m 2.
The gram weight of the fine fiber layer is 80-100g/m2, the gram weight of the fiber layer is 120-140g/m2, the gram weight of the base fabric layer is 100-130g/m2, and the gram weight of the coarse fiber layer is 200-230g/m 2.
The fineness of the fine fiber layer is 1.5dtex, the fineness of the fiber layer is 2.2dtex, and the fineness of the coarse fiber layer is 7.8 dtex.
The length of the fine fiber layer is 38-65mm, the length of the fiber layer is 51-76mm, and the length of the coarse fiber layer is 51-66 mm.
The fine fiber layer, the fiber layer and the coarse fiber layer are made of one or more of polyester fibers, polyphenylene sulfide fibers, polyphenylene sulfone sulfoxide fibers, aramid fibers, polytetrafluoroethylene fibers, polyimide fibers, polysulfonamide fibers, acrylic fibers and the like.
An ultra-clean high-flux filter material comprises the filter material substrate and a microporous membrane, wherein the microporous membrane is compounded on a fine fiber layer.
The microporous membrane is a polytetrafluoroethylene microporous membrane capable of being fibrillated deeply, the thickness of the microporous membrane is 2-10 mu m, the pore diameter of the microporous membrane is 2-15 mu m, and the air permeability is more than or equal to 220L/dm2Min, width 1.5m-2.6 m.
After the technical scheme is adopted, the utility model discloses following beneficial effect has:
1. the utility model discloses make the three-dimensional asymmetric structure substrate that inlays each other with multilayer structure substrate through many fallers of high frequency acupuncture technology or high-pressure water thorn technology, the fibre inlays each other between the layer and fuses in succession interweaving, has eliminated "interfacial effect" between the layer almost, can reduce the running resistance.
2. The utility model discloses but a degree of depth fibrillation polytetrafluoroethylene microporous membrane has been selected, this type of membrane flux is big, and the aperture is moderate, improves the porosity during degree of depth fibrillation, and jumbo size fibre further splits into more than the aperture of membrane of tectorial membrane filter material aperture ratio membrane of formation become lit. The filter material aperture is little, can high efficiency filter dust, and the quantity in filter material hole is many, improves the air permeability. Large ventilation quantity, good ventilation and low running resistance.
Through step can prepare a high flux degree of depth fibrillation tectorial membrane filter material, this filter material has high efficiency, easy deashing, low resistance, technical advantage such as long-life, be fit for being used in old pocket type (electricity bag is compound) dust pelletizing system transformation for super clean emission or require super clean emission and have the newly-built pocket type dust pelletizing system of clear and definite energy-conserving index, can realize only changing the filter bag of making by super clean high flux tectorial membrane filter material and can realize super clean emission or newly-built pocket type dust pelletizing system and realize having obvious energy-conserving effect when super clean discharges.
Drawings
FIG. 1 is a schematic diagram of the filter material structure of the present invention;
FIG. 2 is a SEM comparison of the prior art with the embodiment of the present invention, wherein (1) is prior art and (2) is the present invention;
fig. 3 is a comparison diagram of the aperture change of the embodiment of the present invention compared with the prior art, wherein (1) is the prior art, and (2) is the present invention.
Description of reference numerals:
a microporous membrane 10; a fine fiber layer 20; a fiber layer 30; a base fabric layer 40; a coarse fiber layer 50.
Detailed Description
As shown in FIG. 1, the present invention discloses a filter material substrate, and a super-clean high-throughput and preparation method using the same.
The filter material base material comprises a fine fiber layer 20, a fiber layer 30, a base cloth layer 40 and a coarse fiber layer 50 which are sequentially arranged from a dust-facing surface to a dust-backing surface, wherein a mutual embedding and fusing structure is formed among the fine fiber layer 20, the fiber layer 30 and the base cloth layer 40, and among the base cloth layer 40 and the coarse fiber layer 50.
The gram weight of the filter material substrate is 500-600g/m 2. The fine fiber layer 20 g/m2 has a weight of 80-100g/m, a fineness of 1.5dtex, and a length of 38-65 mm. The fiber layer 30 has a weight of 120-140g/m2, a fineness of 2.2dtex and a length of 51-76 mm. The basis cloth layer 40 has a gram weight of 100-130g/m 2. The coarse fiber layer 50 has the gram weight of 200-230g/m2, the fineness of 7.8dtex and the length of 51-66 mm.
The fine fiber layer 20, the fiber layer 30, the base fabric layer 40 and the coarse fiber layer 50 are made of one or more of polyester fiber, polyphenylene sulfide fiber, polyphenylene sulfone sulfoxide fiber, aramid fiber, polytetrafluoroethylene fiber, polyimide fiber, polysulfonamide fiber, acrylic fiber and the like.
The ultra-clean high-flux filter material comprises the filter material base material and the microporous membrane 10, wherein the microporous membrane 10 is compounded on the fine fiber layer 20. In the utility model, the microporous membrane 10 is a polytetrafluoroethylene microporous membrane 10 capable of deep fibrillation, the thickness of the microporous membrane is 2-10 μm, the aperture of the membrane is 2-15 μm, the air permeability is more than or equal to 220L/dm2.min, and the width is 1.5m-2.6 m.
The method for preparing the ultra-clean high-flux filter material comprises the following steps:
selecting a needling process or a high-pressure spunlace consolidation process according to the gram weight of the prepared filter material substrate:
if the gram weight of the filter material base material is lower than 550g/m2, a high-pressure spunlace process is selected to carry out front and back face spunlace, and the filter material base material is formed.
Specifically, the fine fiber layer 20 and the fiber layer 30 on the base cloth layer 40 are consolidated by adopting a high-pressure high-density process, namely, at least two times of needling spraying are carried out by adopting a double-drainage needle plate with the aperture of 0.010mm and the pressure of a hydraulic needling head of 320-380bar, so that the fine fiber layer 20, the fiber layer 30 and the base cloth layer 40 are ensured to be mutually embedded and fused; the coarse fiber layer 50 is fixedly connected by adopting a single drainage needle plate with the aperture of 0.012mm, and the spunlace pressure is 280-340bar for carrying out at least two times of spunlacing so as to ensure that the fourth layer and the base fabric layer 40 are mutually embedded and fused; and finally, 1 step of adopting a double-drainage needle plate with the aperture of 0.1mm, and performing surface finishing treatment on the fine fiber layer 20 under the spunlace pressure of 180-260bar to form a filter material base material.
When the high-pressure spunlace process is carried out, drying and heat setting are needed, wherein the drying and heat setting are directly carried out in a 160-310 ℃ drying oven, and the drying and heat setting are completed in one step.
And if the gram weight of the filter material base material is more than or equal to 550g/m2, repeatedly solidifying by using a high-frequency multi-needle-plate needling process to form the filter material base material.
Specifically, a four-needle-plate needling machine with two needle plates at the upper part and the lower part is adopted for consolidation; the fine fiber layer 20, the coarse fiber layer 50 and the base cloth layer 40 are fixedly connected by an upper two needle plates, and the needles are 36-42 spiral needles to ensure that the three layers of fibers are mutually embedded and fused; the consolidation of the coarse fiber layer 50 and the base cloth layer 40 is carried out by the lower two needle plates, and the fourth layer and the base cloth layer 40 are ensured to be mutually embedded and fused by adopting 32-42 needle needles with equilateral triangle working parts; and (3) after consolidation, performing face trimming treatment, wherein the face trimming adopts a 38-size triangular conical pricker and a high-frequency shallow pricking process to form the filter material base material.
After the filter material base material is formed, the filter material base material needs to be subjected to heat setting and singeing treatment.
And 3, carrying out hot-pressing film covering treatment on the polytetrafluoroethylene microporous membrane 10 and a filter material base material, and applying certain tension to the polytetrafluoroethylene microporous membrane 10 transversely and longitudinally to further crack the membrane to form more micro-fiber interwoven gaps, namely deep fibrillation treatment, so as to form the ultra-clean high-flux filter material.
The hot-pressing laminating treatment specifically comprises the following steps:
the method comprises the steps of flatly spreading a polytetrafluoroethylene microporous membrane 10 capable of being deeply fibrillated on a fine fiber layer 20 of a filter material base material, setting a certain longitudinal stretching force and a certain transverse tension, enabling two sides of the polytetrafluoroethylene microporous membrane 10 capable of being deeply fibrillated to be 12cm wider than the filter material base material, enabling the polytetrafluoroethylene microporous membrane 10 capable of being deeply fibrillated and a special structure base material to pass through a hot-pressing laminating roller at a speed of 3-10m/min, and applying a pressure of 0.1-0.6MPa on the hot-pressing laminating roller to complete compounding and deep fibrillation treatment, wherein the surface temperature of the hot-pressing laminating roller is 100-.
The utility model discloses make the three-dimensional each other inlay asymmetric structure substrate with multilayer structure substrate through many fallers of high frequency acupuncture technology or high pressure water thorn technology, the fibre each other inlays and fuses and interweaves in succession between the layer, has eliminated "interfacial effect" between the layer almost.
Through the design of the fine fiber layer 20 and a special face-trimming technology, the nodes between the fibers and the film after film coating are ensured to be fine and smooth without caking, and the void loss rate after film coating is obviously reduced. The utility model discloses but a degree of depth fibrillation polytetrafluoroethylene microporous membrane 10 has been selected, this type of membrane flux is big, and the aperture is moderate, when compounding through hot pressing technology and special construction substrate, can further degree of depth fibrillation improve the porosity, and the tectorial membrane filter material aperture of preparation compares the aperture of membrane and becomes littleer.
In order to make the foregoing more comprehensible, an embodiment is provided below.
In the embodiment, firstly, a second PPS fiber layer 30 and a fourth PPS coarse fiber layer 50 are respectively paved on two sides of a polyphenylene sulfide (PPS) base fabric layer 403 by using a double-carding double-paving process, then a single-carding single-paving process is used for forming 4 layers of fluffy PPS cellulose felts on the second PPS fiber layer 30 and the first PPS fine fiber layer 20 by pre-needling;
secondly, the PPS plain felt is sent into a high-pressure spunlace machine to carry out front and back surface spunlace at the speed of 6m/min, wherein the first layer and the second layer on the base cloth are consolidated by adopting a high-pressure high-density process, namely, a double-drainage needle plate with the aperture of 0.01mm is adopted, and the pressure of a spunlace head is 320-380bar for carrying out at least 2 times of spunlace, so that the first layer and the second layer of fibers and the base cloth layer 40 are ensured to be mutually embedded and fused; the fourth layer is fixedly connected by adopting a single drainage needle plate with the aperture of 0.012mm, and the spunlace pressure is 280-340bar for at least 2 times of spunlace, so that the fourth layer and the base fabric layer 40 are ensured to be mutually embedded and fused; finally, 1 step of adopting a double-drainage needle plate with the aperture of 0.1mm, carrying out surface finishing treatment on the first fine fiber layer 20 at the spunlace pressure of 180-260bar (different according to fiber materials), drying and heat setting at the temperature of 220 ℃, and finally forming the PPS base material with the three-dimensional mutual embedded asymmetric special structure;
then compounding a polytetrafluoroethylene microporous membrane 100 capable of being deeply fibrillated on the surface of a fine fiber layer 20 of a PPS (polyphenylene sulfide) base material with a special structure by hot pressing, wherein two sides of the polytetrafluoroethylene microporous membrane 101 capable of being deeply fibrillated are 12cm wider than the PPS base material with the special structure, certain pressure is applied in the longitudinal direction and certain tension is applied in the transverse direction of the membrane to ensure that the polytetrafluoroethylene microporous membrane 10 is further cracked to form more fine fiber interwoven gaps, namely, the deep fibrillation is carried out, a covering membrane passes through a hot-melting laminating roller at the speed of 6m/min, the pressure of 0.4MPa is applied to the hot-melting laminating roller, and the surface temperature of the hot-melting laminating roller is 230 +/-5 ℃;
finally, the membrane filter material with high flux, fine nodes and smaller pore diameter is obtained (as shown in figures 2 and 3).
The above description is only an embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.
Claims (8)
1. A filter material substrate, characterized by: the dust-proof cloth comprises a fine fiber layer, a base cloth layer and a coarse fiber layer which are sequentially arranged from a dust-facing surface to a dust-backing surface, wherein a mutual embedding structure is formed among the fine fiber layer, the fiber layer and the base cloth layer, and between the base cloth layer and the coarse fiber layer.
2. A filter material substrate according to claim 1, wherein: the gram weight of the filter material substrate is 500-600g/m 2.
3. A filter material substrate according to claim 1 or claim 2, wherein: the gram weight of the fine fiber layer is 80-100g/m2, the gram weight of the fiber layer is 120-140g/m2, the gram weight of the base fabric layer is 100-130g/m2, and the gram weight of the coarse fiber layer is 200-230g/m 2.
4. A filter material substrate according to claim 1 or claim 2, wherein: the fineness of the fine fiber layer is 1.5dtex, the fineness of the fiber layer is 2.2dtex, and the fineness of the coarse fiber layer is 7.8 dtex.
5. A filter material substrate according to claim 1 or claim 2, wherein: the length of the fine fiber layer is 38-65mm, the length of the fiber layer is 51-76mm, and the length of the coarse fiber layer is 51-66 mm.
6. A filter material substrate according to claim 1, wherein: the fine fiber layer, the fiber layer and the coarse fiber layer are made of one or more of polyester fibers, polyphenylene sulfide fibers, polyphenylene sulfone sulfoxide fibers, aramid fibers, polytetrafluoroethylene fibers, polyimide fibers, polysulfonamide fibers, acrylic fibers and the like.
7. An ultra-clean high-flux filter material, which is characterized in that: comprising the filter material substrate of any one of claims 1-6, and a microporous membrane composited on the fine fiber layer.
8. The ultra-clean high flux filter material of claim 7, wherein: the microporous membrane is a polytetrafluoroethylene microporous membrane capable of being fibrillated deeply, the thickness of the microporous membrane is 2-10 mu m, the pore diameter of the microporous membrane is 2-15 mu m, the air permeability is more than or equal to 220L/dm2.min, and the width of the microporous membrane is 1.5m-2.6 m.
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| CN112473245A (en) * | 2020-09-14 | 2021-03-12 | 福州大学 | Filter material substrate, ultra-clean high-flux filter material and preparation method thereof |
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| CN112473245A (en) * | 2020-09-14 | 2021-03-12 | 福州大学 | Filter material substrate, ultra-clean high-flux filter material and preparation method thereof |
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