CN113144751A - Composite filter material and preparation method thereof - Google Patents

Composite filter material and preparation method thereof Download PDF

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Publication number
CN113144751A
CN113144751A CN202110605769.6A CN202110605769A CN113144751A CN 113144751 A CN113144751 A CN 113144751A CN 202110605769 A CN202110605769 A CN 202110605769A CN 113144751 A CN113144751 A CN 113144751A
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China
Prior art keywords
filter material
drying
dipping
aramid
composite filter
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CN202110605769.6A
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CN113144751B (en
Inventor
高立花
郑亭路
庄锐
姚坤承
付丽君
张宇
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Shandong Jufang New Material Co ltd
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Shandong Jufang New Material Co ltd
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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
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/08—Impregnating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/08—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • 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
    • D04H1/4334—Polyamides
    • D04H1/4342—Aromatic polyamides
    • 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
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/021—Fibrous or filamentary layer
    • B32B2260/023—Two or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/046—Synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B32B2262/0269—Aromatic polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/14—Mixture of at least two fibres made of different materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

The invention belongs to the field of new materials, and provides a composite filter material and a preparation method thereof, wherein the preparation method of the composite filter material comprises the following steps: (1) vertically interweaving warp PPS yarns and weft aramid 1414 yarns to prepare base cloth; (2) aramid fiber 1414 is made into an aramid fiber 1414 layer through an air-laid process; (3) lapping and stacking the aramid fiber 1414 layers on the upper surface and the lower surface of the base cloth, and performing preliminary pre-needling; (4) performing main needling; (5) performing circulating dipping and drying treatment, namely circularly dipping and drying the filter material obtained in the step (4) in a dipping solution for many times, wherein the dipping solution is a para-aramid nano-fiber dispersion solution; (6) pre-drying, drying and high-temperature shaping. The composite filter material prepared by the invention has the characteristics of high temperature resistance, chemical resistance and flame retardance, has high filtering efficiency and can be applied to the bag type dust removal technology.

Description

Composite filter material and preparation method thereof
Technical Field
The invention relates to the field of new materials, and particularly provides a composite filter material and a preparation method thereof.
Background
In recent years, the heavy chemical industry (power, building materials, metallurgy, chemical industry and the like) mainly based on resource and energy consumption in China is rapidly developed, and China becomes the first major steel, cement, coal and chemical fiber producing country and the second major power, nonferrous metals and fertilizer producing country in the world.
The above heavy industry brings about a serious environmental pollution problem worldwide, wherein the atmospheric pollutants in the heavy chemical industry are mainly characterized by high-temperature flue gas, and smoke dust particles are one of the main control objects. As a total amount control regulation, the state continuously revises the emission values set by various boilers and furnaces in the industrial field, and strictly requires the reduction of the emission. The bag type dust removal technology can ensure that the smoke concentration at the smoke outlet is less than 50mg/Nm3In the following, the control technology of particulate matters (smoke dust) discharged by high-temperature flue gas is quickly changed to the bag-type dust removal technology. However, as a key for the application of the bag type dust removal technology, namely, a high-temperature dust removal filter material, most of the high-temperature dust removal filter material is still trusting foreign products, and domestic products are lack of technical support in simulation use, so that the situation is urgently needed to be changed. The filter bag of the bag type dust collector of the coal-fired boiler of the existing power plant is mostly made of PPS (polyphenylene sulfide) materialFelt filter material (filter material after needle punching), but the smoke concentration at the smoke outlet is difficult to be reduced to 30mg/Nm3The following.
Therefore, whether a brand-new composite filter material can be provided or not breaks through the technical monopoly abroad, fills the blank of relevant fields in China and becomes the direction in which people need great effort.
Disclosure of Invention
The invention provides a composite filter material and a preparation method thereof aiming at the blank of the technology, wherein the preparation method of the composite filter material comprises the following steps: (1) vertically interweaving warp PPS yarns and weft aramid 1414 yarns to prepare base cloth; (2) aramid fiber 1414 is made into an aramid fiber 1414 layer through an air-laid process; (3) lapping and stacking the aramid fiber 1414 layers on the upper surface and the lower surface of the base cloth, and performing preliminary pre-needling; (4) performing main needling; (5) performing circulating dipping and drying treatment, namely circularly dipping and drying the filter material obtained in the step (4) in a dipping solution for many times, wherein the dipping solution is a para-aramid nano-fiber dispersion solution; (6) pre-drying, drying and high-temperature shaping. The composite filter material prepared by the invention has the characteristics of high temperature resistance, chemical resistance and flame retardance, has high filtering efficiency and can be applied to the bag type dust removal technology.
Compared with the prior art, the technical scheme of the invention adopts the para-aramid nano-fiber dispersion liquid as the impregnation liquid of the filter material. The diameter of the para-aramid nano-fiber is 10-100Nm, the length-diameter ratio is about 3000, and the para-aramid nano-fiber has the characteristics of surface effect, small size effect, high adsorption effect and the like, so that the para-aramid nano-fiber shows extremely strong adsorption and filtration effects, and the smoke concentration at a smoke outlet can be reduced to 20mg/Nm3The following. The filter material is easy to clean ash and not easy to scale; the air permeability is proper, and the resistance is low; has enough strength, good dimensional stability, good temperature resistance, chemical corrosion resistance and oxidation resistance.
The specific technical scheme of the invention is as follows:
the composite filtering material is a three-layer structure, wherein the upper surface and the lower surface of the composite filtering material are aramid fiber 1414 layers, the middle of the composite filtering material is a base cloth layer, the base cloth layer is formed by mutually and vertically interweaving warp yarns PPS (polyphenylene sulfide) yarns and weft yarns aramid fiber 1414 yarns, and the warp yarns are interwoven with the weft yarns PPS yarnsDensity: weft density is 1:1, basis weight is 320g/m2。
The composite filter material is also subjected to impregnation treatment of para-aramid nano-fiber dispersion liquid;
after the treatment, the longitudinal tensile strength and the transverse tensile strength of the material are both over 2200N, and the smoke concentration at the smoke outlet is reduced to 20mg/Nm after the material is applied to the bag type dust removal technology3The following.
The inventor also provides a preparation method of the composite filter material, which comprises the following steps;
(1) vertically interweaving warp PPS yarns and weft aramid 1414 yarns to prepare base cloth;
(2) aramid fiber 1414 is made into an aramid fiber 1414 layer through an air-laid process;
(3) lapping and stacking the aramid fiber 1414 layers on the upper surface and the lower surface of the base cloth, and performing preliminary pre-needling;
(4) performing main needling to prepare a filter material;
(5) circularly dipping and drying; circularly dipping and drying the filter material obtained in the step (4) in a dipping solution for many times, wherein the dipping solution is a para-aramid nano-fiber dispersion solution;
(6) pre-drying, drying and high-temperature shaping.
The para-aramid nano-fiber dispersion liquid in the step (5) is prepared by a preparation method disclosed by a patent CN 106750265A or CN105153413A, the bulk weight concentration of the used para-aramid nano-fiber dispersion liquid is 0.1-5 per mill, and the inherent viscosity is controlled to be 2-4 dL/g. By adopting the prepared material, the nano-scale aramid fiber has the characteristics of high strength, high abrasion and high temperature resistance of aramid fiber, and also has the high-precision filtering performance of nano-material, so that the nano-scale aramid fiber is suitable for high-precision high-temperature filtering materials.
The para-aramid nano-fiber adopted by the invention has the basic characteristics of high strength, high modulus, flame retardance and high temperature resistance of aramid fiber, and can obviously improve the mechanical property of the composite material; the diameter of the para-aramid nano-fiber is 10-100nm, the length-diameter ratio is about 3000, the composite material has the remarkable advantages of small size, large specific surface area, high surface energy and strong electrostatic adsorption capacity, and the filtering performance of the composite material can be greatly improved; the inherent viscosity of the adopted nano fiber is controllable, the dispersion liquid only contains water, and only drying is needed in the later use process, so that no chemical reagent is left.
In the dipping treatment in the step (5), the dipping temperature is 20-40 ℃, the drying temperature is 110 ℃, and the dipping time is 5 s-20 min; the dipping times are more than 2, so that the optimal dipping effect can be obtained only by the parameters, and the blank in the field is filled.
In the step (6), the pre-drying temperature is 95-110 ℃, the pre-drying time is 1min, the drying temperature is 110-130 ℃, the drying time is 3min, the high-temperature setting temperature is 200-230 ℃, and the setting time is 5 min.
And (6) finishing the pre-drying, drying and high-temperature setting by a tentering setting machine.
In addition, other steps of the preparation method of the composite filter material can be completed by referring to the prior art, such as relevant process parameters disclosed in the preparation method of the high-temperature resistant filter material in the prior art CN 111804063A;
the air-laying process in the step (2) can specifically be as follows:
firstly, unpacking fibers; fiber opening-using air flow to convey fiber to form uniform fiber web with randomly arranged fiber; mixing fibers; thirdly, removing impurities from the fibers; fourthly, feeding the mixed fiber into a cylinder which can be filled at a high speed; fiber falls off, and the fiber is conveyed by airflow and condensed into a fiber web; and sixthly, outputting the fiber web, namely uniformly conveying and condensing the fiber web on a net curtain by airflow to form the fiber web with three-dimensional distribution and small strength difference in the longitudinal direction and the transverse direction.
In the invention, the composite of the para-aramid nano-fiber adopts an impregnation method, the composite dosage of the para-aramid nano-fiber can be well quantified by adjusting the concentration of the dispersion liquid of the para-aramid nano-fiber, and the impregnated nano-fiber is uniformly distributed on the surface of the melt-blown non-woven material, so that the composite effect is better, and the industrial production is easy to realize; compared with a coating process, the drying time is short, the uniformity is good, and the industrial production is facilitated; the equipment of the invention is simple and easy to operate, and the method obviously improves the filtration of the filter materialThe filtering performance and the mechanical performance are detected, the longitudinal tensile strength and the transverse tensile strength are both over 2200N, and the smoke concentration at the smoke outlet is reduced to 20mg/Nm after the filter is applied to the bag type dust removal technology3The following.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but it should not be construed that the scope of the above subject matter is limited to the following examples. All the technologies realized based on the above contents of the present invention belong to the scope of the present invention, and the following embodiments are all completed by adopting the conventional prior art except for the specific description. Aramid 1414 yarns are adopted in the following embodiments, and Shandong polyaromatic new material GmbH brand N aramid 1414 yarns are selected; PPS yarn, selecting 1140A6PPS yarn of Japanese treasures; the para-aramid nano-fiber dispersion liquid is prepared by a preparation method disclosed by a patent CN 106750265A or CN105153413A, the weight concentration of the used para-aramid nano-fiber dispersion liquid is 0.1-5 per mill, and the inherent viscosity is controlled to be 2-4 dL/g.
Example 1
A composite filter material and a preparation method thereof comprise the following steps:
(1) vertically interweaving warp PPS yarns and weft aramid 1414 yarns to prepare base cloth; wherein, the warp density: weft density is 1:1, basis weight is 320g/m2。
(2) Aramid fiber 1414 is made into an aramid fiber 1414 layer through an air-laid process;
opening: opening the aramid 1414 fibers by an opener to enable the aramid fibers to be in a fluffy state; carding: sending the mixture into a carding machine to be carded into a fiber web; thirdly, lapping: lapping by using a lapping machine;
(3) lapping and stacking the aramid fiber 1414 layers on the upper surface and the lower surface of the base cloth, and performing preliminary pre-needling;
(4) performing main needling to prepare a filter material;
the first layer of the filter material is an aramid 1414 fiber layer with the gram weight of 140g/m2(ii) a The second layer is a base fabric which is prepared by the step (1) and has the gram weight of 320g/m2(ii) a Third stepThe layer is an aramid fiber 1414 layer with the gram weight of 140g/m2。
All the steps can refer to the related technical scheme disclosed in the preparation method of the high-temperature resistant filter material in the prior art CN 111804063A;
(5) circularly dipping and drying; soaking the filter material in the step (4) in a soaking solution for 2 times, wherein the retention time of the filter material in the soaking solution is 15s each time, the soaking temperature is 30 ℃, the drying temperature is 110 ℃, the drying time is 1min, the weight concentration of the used para-aramid nano-fiber dispersion liquid is 1 per thousand, and the inherent viscosity is controlled to be 2 dL/g;
(6) pre-drying, drying and high-temperature setting in a tentering setting machine. Controlling the pre-drying temperature at 100 deg.C for 1min, the drying temperature at 120 deg.C for 3min, and the high-temperature setting temperature at 210 deg.C for 5 min.
Example 2
Example 2 is essentially the same as example 1, the only difference being the impregnation process.
Example 3
Example 3 is essentially the same as example 1, the only difference being the impregnation process.
Example 4
Example 4 is essentially the same as example 1, the only difference being the impregnation process.
Comparative example
Comparative example the specific preparation steps were steps 1-4 of example 1, and no further impregnation was performed.
The differences in the impregnation process described above are shown in the following table:
impregnation treatment process Comparative example Example 1 Example 2 Example 3 Example 4
Number of impregnations 0 2 8 12 20
Impregnation residence time/s —— 15 20 10 25
Immersion temperature/. degree.C —— 20 28 30 30
ANF concentration/% o —— 1 0.1 0.5 0.2
ANF viscosity/dL g-1 —— 2.0 2.5 3 2.5
The composite filter material finally obtained by utilizing the different impregnation processes has the following properties:
after being placed for 24 hours under the experimental conditions that the ambient temperature is 26 ℃ and the relative humidity is 65%, the test sample is cut into the size of 30cm multiplied by 5cm, and the longitudinal tensile strength and the transverse tensile strength of the sample are measured according to GB/T3923 by using an electronic fabric strength instrument, and specific data are shown in the following table.
Strong Comparative example Example 1 Example 2 Example 3 Example 4
Transverse strength/N 2105 2230 2198 2375 2630
Longitudinal strength/N 2210 2297 2256 2411 2691
In addition, the materials obtained in the comparative examples and the examples can reach 220 ℃ of maximum long-term service temperature, and the inventor also tests the filtration efficiency of the composite filter material obtained in the prior art:
according to the GB/T5468-1991 boiler smoke dust test method, the smoke dust concentration at the smoke outlet is tested, and the specific data are shown in the following table.
Concentration of soot Comparative example Example 1 Example 2 Example 3 Example 4
mg/Nm3 32 19 20 17 25
It can be seen from the above two tables that the tensile strength of the material increases with the increase of the dipping times, but the dipping times increase to a certain extent, which easily blocks the pore diameter of the filter material, and on the contrary, the smoke concentration at the smoke outlet increases. The filter material properties obtained for the impregnation conditions of example 3 above were therefore more balanced.

Claims (6)

1. A composite filter material characterized by: the fabric is of a three-layer structure, wherein the upper surface and the lower surface are aramid fiber 1414 layers, the middle part is a base fabric layer, the base fabric layer is formed by mutually and vertically interweaving warp PPS (polyphenylene sulfide) yarns and weft aramid fiber 1414 yarns, and the warp density is as follows: weft density is 1:1, basis weight is 320g/m2(ii) a And the composite filter material is subjected to impregnation treatment of the para-aramid nanofiber dispersion liquid.
2. The composite filter material of claim 1, wherein:
the longitudinal tensile strength and the transverse tensile strength of the composite filter material are both greater than 2200N.
3. A method of making the composite filter material of claim 1, wherein: comprises the following steps;
(1) vertically interweaving warp PPS yarns and weft aramid 1414 yarns to prepare base cloth;
(2) aramid fiber 1414 is made into an aramid fiber 1414 layer through an air-laid process;
(3) lapping and stacking the aramid fiber 1414 layers on the upper surface and the lower surface of the base cloth, and performing preliminary pre-needling;
(4) performing main needling to prepare a filter material;
(5) circularly dipping and drying; circularly dipping and drying the filter material obtained in the step (4) in a dipping solution for many times, wherein the dipping solution is a para-aramid nano-fiber dispersion solution;
(6) pre-drying, drying and high-temperature shaping;
wherein the weight concentration of the para-aramid nano-fiber dispersion liquid in the step (5) is 0.1-5 per mill, and the inherent viscosity is controlled to be 2-4 dL/g.
4. The method for producing a composite filter material according to claim 3, characterized in that: in the dipping treatment in the step (5), the dipping temperature is 20-40 ℃, the drying temperature is 110 ℃, and the dipping time is 5 s-20 min; the dipping times are 2-20.
5. The method for producing a composite filter material according to claim 3, characterized in that: in the step (6), the pre-drying temperature is 95-110 ℃, the pre-drying time is 1min, the drying temperature is 110-130 ℃, the drying time is 3min, the high-temperature setting temperature is 200-230 ℃, and the setting time is 5 min.
6. The method for producing a composite filter material according to claim 3, characterized in that: and (6) finishing the pre-drying, drying and high-temperature setting by a tentering setting machine.
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