CN114768387B - Super-hydrophobic filter felt and preparation method thereof - Google Patents
Super-hydrophobic filter felt and preparation method thereof Download PDFInfo
- Publication number
- CN114768387B CN114768387B CN202210361629.3A CN202210361629A CN114768387B CN 114768387 B CN114768387 B CN 114768387B CN 202210361629 A CN202210361629 A CN 202210361629A CN 114768387 B CN114768387 B CN 114768387B
- Authority
- CN
- China
- Prior art keywords
- filter felt
- super
- needling
- water repellent
- hydrophobic filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003075 superhydrophobic effect Effects 0.000 title claims abstract description 99
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 98
- 230000002940 repellent Effects 0.000 claims abstract description 52
- 239000005871 repellent Substances 0.000 claims abstract description 52
- 239000007864 aqueous solution Substances 0.000 claims abstract description 35
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 34
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 34
- 239000000835 fiber Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 28
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 24
- 125000002091 cationic group Chemical group 0.000 claims abstract description 21
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000007493 shaping process Methods 0.000 claims abstract description 9
- 238000002791 soaking Methods 0.000 claims abstract description 9
- 229920000742 Cotton Polymers 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 abstract description 8
- 238000004140 cleaning Methods 0.000 abstract description 5
- 238000005470 impregnation Methods 0.000 abstract description 4
- 239000000428 dust Substances 0.000 description 16
- 238000009736 wetting Methods 0.000 description 16
- 230000002209 hydrophobic effect Effects 0.000 description 14
- 239000010410 layer Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 239000002344 surface layer Substances 0.000 description 10
- 238000001514 detection method Methods 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 7
- 238000007598 dipping method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000002156 mixing Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000004760 aramid Substances 0.000 description 4
- 229920003235 aromatic polyamide Polymers 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000009960 carding Methods 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 210000000795 conjunctiva Anatomy 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009999 singeing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000008234 soft water Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
-
- 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
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
-
- 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
- D04H1/4282—Addition polymers
- D04H1/4318—Fluorine series
-
- 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
- D04H1/44—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
-
- 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
- D04H1/44—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
- D04H1/492—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C7/00—Heating or cooling textile fabrics
- D06C7/02—Setting
-
- 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
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/244—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of halogenated hydrocarbons
- D06M15/256—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of halogenated hydrocarbons containing fluorine
-
- 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
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
-
- 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
- D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
- D06M2200/10—Repellency against liquids
- D06M2200/12—Hydrophobic properties
Abstract
The application relates to the technical field of filtration, in particular to a super-hydrophobic filter felt and a preparation method thereof. The preparation method of the super-hydrophobic filter felt specifically comprises the following steps: the cotton layer obtained after fiber lapping is needled, singed and calendared to obtain needled felt; carrying out water-jet needling on the needled felt, soaking in PTFE aqueous solution, carrying out primary drying and shaping, soaking in water repellent aqueous solution, and carrying out secondary drying treatment to obtain the super-hydrophobic filter felt; wherein the water jet speed is 10-15m/min, and the water jet pressure is 300-340bar; the water repellent is a cationic fluorocarbon water repellent. According to the preparation method of the super-hydrophobic filter felt, due to the adoption of specific water jet, PTFE aqueous solution impregnation and water repellent aqueous solution impregnation processes, the obtained super-hydrophobic filter felt has excellent hydrophobicity and self-cleaning property.
Description
Technical Field
The application relates to the technical field of filtration, in particular to a super-hydrophobic filter felt and a preparation method thereof.
Background
The needled filter felt is a fine fiber cloth which is made by adopting a non-woven needling process and by adopting a heat setting and other treatment methods and is widely used in the aspects of industrial dust catching, smoke dust treatment and the like. The needled filter felt is used as an important air filtering material, can be compounded with other filtering materials to prepare a bag-type dust remover, and achieves the effect of capturing solid particles in dust-containing gas. The bag-type dust collector manufactured by adopting the needled filter felt is widely applied to industries such as thermal power generation, steel, coking, nonferrous smelting, cement and the like.
Because of industries such as thermal power generation, steel, coking, nonferrous smelting and the like, the generated flue gas contains gaseous water brought by the combustion or drying process. When the temperature of the flue gas is reduced below the dew point, the gaseous water can condense on the surface of the non-woven material and is combined with a large amount of dust trapped on the surface of the bag-type dust collector, so that the adhesive force of the dust on the surface of the non-woven material is increased, the surface of the bag-type dust collector is scaled, the filtering resistance on the surface of the bag-type dust collector is increased, and the filtering effect of the bag-type dust collector is reduced.
Therefore, there is a need for a hydrophobic nonwoven material having a hydrophobic ability to improve the phenomenon of condensation of water on the surface of the nonwoven material.
Disclosure of Invention
In order to improve the hydrophobicity of a non-woven material, the application provides a super-hydrophobic filter felt and a preparation method thereof.
In a first aspect, the application provides a preparation method of a superhydrophobic filter felt, which adopts the following technical scheme:
the preparation method of the super-hydrophobic filter felt specifically comprises the following steps:
the cotton layer after lapping is needled, singed and calendared to obtain needled felt; carrying out water-jet needling on the needled felt, soaking in PTFE aqueous solution, carrying out primary drying and shaping, soaking in water repellent aqueous solution, and carrying out secondary drying treatment to obtain the super-hydrophobic filter felt; wherein the water jet speed is 10-15m/min, and the water jet pressure is 300-340bar;
the PTFE aqueous solution is formed by mixing PTFE dispersion emulsion and water;
the water repellent aqueous solution is formed by mixing a water repellent and water;
the water repellent is a cationic fluorocarbon water repellent.
By adopting the technical scheme, due to the adoption of the specific water needling treatment, on one hand, single fibers in the needled felt are changed into a plurality of fibers, and the surface fluff of the fibers is finer, and the surface fluff Mao Tuqi of the filter material is just like the protrusion of the fluff on the surface of lotus leaves, so that the smoothness of the surface and the compactness of micropores of the obtained superhydrophobic filter felt are improved. On the other hand, due to the water-jet treatment of a specific process, the obtained super-hydrophobic filter felt forms a three-dimensional dust-holding echelon type three-dimensional structure, so that the super-hydrophobic filter felt with the surface having a hydrophobic effect and a surface layer filtering effect is obtained, and the hydrophobic and filtering effects of the obtained super-hydrophobic filter felt are improved. Meanwhile, the needled felt reinforced by water needling is impregnated by PTFE aqueous solution and water repellent aqueous solution, and after being dried, the needled felt has very low surface tension due to small van der Waals intermolecular attraction of fluorocarbon, is easy to permeate to the surface of fiber, and reduces the surface tension of the obtained superhydrophobic filter felt. Therefore, the hydrophobic effect of the super-hydrophobic filter felt is further improved.
Preferably, the hydroentangling speed is 13-15m/min, and the hydroentangling pressure is 320-340bar.
Through adopting above-mentioned technical scheme, adopt soft water jet to carry out the direct rebound of above-mentioned speed and pressure to the needled felt for the fibrous web in the needled felt is the entanglement of all-round, and the super-hydrophobic filter felt that forms has the third dimension, consequently has good hydrophobic effect. Through detection, the obtained super-hydrophobic filter felt has a water wetting grade as high as 5, a contact angle of water drops on the surface of the super-hydrophobic filter felt as high as 161-163 degrees, a rolling angle as low as 2 degrees, and excellent anti-wetting performance and self-cleaning performance.
Preferably, the mass percentage concentration of the water repellent aqueous solution is 3-6%.
By adopting the technical scheme, the water repellent aqueous solution with the concentration has good permeability and wettability, can better permeate the surface of the fiber, and improves the hydrophobicity of the obtained super-hydrophobic filter felt. Meanwhile, the water repellent aqueous solution with the concentration has excellent surface activity, heat resistance and chemical stability, and can improve the durability of the obtained super-hydrophobic filter felt.
Preferably, the cationic fluorocarbon water repellent is any one of cationic fluorocarbon water repellent FE-8110, cationic fluorocarbon water repellent WG-405 and cationic fluorocarbon water repellent FE-8200.
Preferably, the mass percentage concentration of the PTFE aqueous solution is 15-20%.
By adopting the technical scheme, PTFE particles in the concentration PTFE aqueous solution can be adsorbed on the surface of the fiber, and adjacent PTFE particles can be mutually connected with a conjunctiva, so that the corrosion resistance and the hydrophobicity of the surface of the fiber are improved, and the effect of improving the corrosion resistance and the hydrophobicity of the obtained super-hydrophobic filter felt is achieved.
Preferably, the needling comprises pre-needling and main needling, wherein the needling depth of the pre-needling is 10-20mm, the needling frequency is 500-750 needling/min, the input speed is 2.5-4.0m/min, and the output speed is 3.5-5.0m/min; the needling depth of the main needling is 5-9mm, the needling frequency is 550-650 needling/min, the input speed is 3-4m/min, and the output speed is 2-3m/min.
By adopting the technical scheme, the needled filter material is a non-woven fabric which reinforces the fiber web into certain performance by utilizing the repeated puncturing action of the puncturing needles. The application sequentially carries out pre-needling and main needling on a fiber net cotton layer which is paved to form a sandwich structure, and the manufactured needled felt is subjected to subsequent water needling, PTFE aqueous solution dipping and water repellent aqueous solution dipping treatment, so that the obtained super-hydrophobic filter felt has excellent hydrophobicity.
Preferably, the shaping temperature is 200-220 ℃, and the shaping time is 5-6min.
By adopting the technical scheme, the heat shrinkage stability of the obtained super-hydrophobic filter felt is better at the setting temperature and time, and the hydrophobic property and self-cleaning capability of the super-hydrophobic filter felt can be improved.
Preferably, the fibers are PTFE fibers.
By adopting the technical scheme, the PTFE fiber is a synthetic fiber prepared by taking polytetrafluoroethylene as a raw material, spinning or preparing a film, and then cutting or fibrillating. The cotton layer obtained by blending the superfine PTFE fibers is subjected to water jet treatment, so that the PTFE fibers are formed like a layer of PTFE film which is coated on the obtained super-hydrophobic filter felt, and the surface has a certain water repellent effect.
In a second aspect, the application provides a superhydrophobic filter felt, which adopts the following technical scheme:
a super-hydrophobic filter felt is prepared by the preparation method of the super-hydrophobic filter felt.
By adopting the technical scheme, due to the combination of the needling and the hydroentangling process, PTFE aqueous solution dipping and water repellent aqueous solution dipping treatment are carried out, and the obtained super-hydrophobic filter felt has excellent hydrophobicity and self-cleaning property.
In summary, the application has the following beneficial effects:
according to the method, the surface fibers of the needled felt are reinforced by adopting a specific water needling process, then PTFE aqueous solution and water repellent aqueous solution are subjected to dipping treatment, the surface fibers of the obtained super-hydrophobic filter felt are smooth and compact, and the super-hydrophobic filter felt forms a three-dimensional dust-holding echelon type three-dimensional structure; after drying, the fluorocarbon permeates to the fiber surface of the three-dimensional dust-holding echelon type three-dimensional structure, so that the surface tension of the obtained super-hydrophobic filter felt is reduced, and the hydrophobic effect of the super-hydrophobic filter felt is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a superhydrophobic filter felt in an embodiment of the application.
Description of the drawings: 1. a dust-back surface layer; 2. a dust facing layer; 3. and a framework layer.
Detailed Description
The application is described in further detail below with reference to the drawings and examples.
c6 water repellent agent with density of 1.1g/cm 3 The pH value is 2-5, and the product is purchased from Zhongan combined technology Co., ltd;
the cationic fluorocarbon water repellent FE-8110 and the cationic fluorocarbon water repellent FE-8200 are purchased from Suzhou Yuanqiao chemical Co., ltd;
the cationic fluorocarbon water repellent WG-405 is purchased from Shanghai Dingwang fine chemical Co., ltd;
PPS staple fiber, 0.9D, purchased from Toli Corp;
aramid short fiber with the specification of 1.5D, product number 009, purchased from Teflon industries, inc. in Nanyang;
PTFE fiber, specification is 0.9D, the super-hydrophobic filter felt obtained in the embodiment of the application and the filter felt obtained in the comparative example are subjected to water wetting grade detection and wettability detection by purchased from Nanjing English Reed high molecular material Co., ltd, and the detection standards are as follows:
detection of water dipping grade, and detection and evaluation of water resistance of textiles by referring to GB/T4745-2012;
the water cut rating description is shown in the following table.
| Water dip rating | Description of the Water pick-up phenomenon |
| Level 0 | Complete wetting of the entire sample surface |
| Level 1 | Complete wetting of the showered surface |
| 1-2 grade | Wetting the surface of the sample beyond the spraying point, wherein the wetting area exceeds half of the sprayed surface |
| Level 2 | Wetting the surface of the sample beyond the spraying point to a wetting area of about half of the surface to be sprayed |
| 2-3 stages | Wetting the surface of the sample beyond the spraying point, wherein the wetting area is less than half of the surface to be sprayed |
| 3 grade | Wetting at spray point on sample surface |
| 3-4 grade | Wetting at a spray point at or below half of the sample surface |
| Grade 4 | Wetting at spray points with sporadic spray points on the sample surface |
| 4-5 grade | The surface of the sample is not wetted and has a small amount of water drops |
| Grade 5 | Without water drops or wetting of the sample surface |
And (3) detecting wettability: at 25.+ -. 2 ℃ 5. Mu.L of water drop was placed on the sample surface and tested for static contact angle and roll angle using an optical contact angle tester. 5 different positions are selected for each sample to be tested, and the test results are averaged.
The optical contact angle tester was a KRUSSDSA100 contact angle meter purchased from gram Lv Shi scientific instruments (Shanghai).
Examples
Example 1
A preparation method of a super-hydrophobic filter felt comprises the following steps:
s1: the method comprises the steps of (1) sequentially unpacking, opening and carding 0.9DPPS short fibers and 1.5D aramid short fibers to obtain a dust-back surface layer 1 and a dust-facing surface layer 2; respectively lapping the back dust surface layer 1 and the dust facing surface layer 2, and then compositing with the framework layer 3 to obtain a cotton layer; the weight ratio of the 0.9DPPS short fiber to the 1.5D aramid short fiber is 3:7;
the rotation speed of the unpacking process is 500rpm;
the rotation speed in the opening process is 850rpm, the wind pressure of the pipeline is 750Pa, and the fan frequency is 40Hz;
carding at 20-25 deg.c, humidity of 60-65% and web speed of 10m/min;
the total number of layers of the net-laying layers of the back dust surface layer 1 and the dust facing surface layer 2 is 10, and the total net-laying thickness is 15cm.
S2: the cotton layer is subjected to needling, singeing, hot rolling and calendaring in sequence to obtain a needled felt; and (3) carrying out water-jet needling on the needled felt, soaking in PTFE solution, drying for the first time, shaping, soaking in water repellent aqueous solution, and drying for the second time to obtain the super-hydrophobic filter felt.
Referring to fig. 1, the super-hydrophobic filter felt sequentially comprises a dust-back surface layer 1, a framework layer 3 and a dust-facing surface layer 2 from bottom to top;
the framework layer 3 is aramid fiber base cloth and is purchased from tin-free high-strength special material limited company;
needling comprises pre-needling and main needling, wherein the cotton layer is pre-needled and then subjected to main needling;
the needling depth of the pre-needling is 8mm, the needling frequency is 450 needling/min, the input speed is 2.0m/min, and the output speed is 3.0m/min;
the needling depth of the main needling is 10mm, the needling frequency is 500 needling/min, the input speed is 2.5m/min, and the output speed is 1.5m/min;
the upper and middle editing space of hot rolling is 2-3mm, the middle and lower spoke space is 2-3mm, the upper milling temperature is 200 ℃, the middle spoke temperature is 180 ℃, the lower spoke temperature is 180 ℃ and the speed is 18m/min;
the speed of the water jet is 10m/min, and the water jet pressure is 300bar;
PTFE solution, which is formed by mixing PTFE dispersion emulsion and water, wherein the mass percentage concentration of the PTFE solution is 12 percent, and the dipping speed of the needled felt in the PTFE solution is 5-8m/min.
The temperature of the primary drying is 220-230 ℃ and the speed is 4-5m/min;
setting at 190 deg.c for 5-6min and at 3-4m/min;
the water repellent aqueous solution is formed by mixing c6 water repellent and water, the mass percentage concentration of the water repellent aqueous solution is 2%, and the soaking speed of the needled felt in the water repellent aqueous solution is 5-8m/min;
the temperature of the second drying is 220-240 ℃ and the speed is 4-5m/min;
examples 2 to 4
A method for preparing a superhydrophobic filter felt, which is different from example 1 in that in S2, the hydroentangling speed and the hydroentangling pressure are different.
The hydroentangling speed and hydroentangling pressure are shown in the following table.
The superhydrophobic filter mats obtained in examples 1-4 above were subjected to water-pick-up level detection and wettability detection, and the detection results are shown in the following table.
As can be seen by combining examples 1-4 with the above table, the superhydrophobic filter mats obtained in examples 1-4 have a water pick-up rating of up to 5, a contact angle of water drops on their surfaces of up to 161-163℃and a rolling angle of as low as 2 ℃. Therefore, the super-hydrophobic filter felt obtained by the embodiment of the application has good hydrophobicity and self-cleaning property.
Examples 5 to 8
A method for preparing a superhydrophobic filter felt, which is different from example 3 in that in S2, the concentration of the water repellent aqueous solution is different in mass percent.
The super-hydrophobic filter mats obtained in examples 5 to 8 were subjected to wettability test, and the test results are shown in the following table.
In combination with examples 5-7 and with the above table, it can be seen that the superhydrophobic filter mats obtained in examples 5-8 have a contact angle of water drops on their surfaces as high as 164 °.
The superhydrophobic filter mats according to examples 5-7 have significantly improved contact angles of water droplets on their surfaces compared to the superhydrophobic filter mats of examples 3 and 8. Therefore, in the preparation step of the super-hydrophobic filter felt, the mass percentage concentration of the water repellent aqueous solution is 3-6%, so that the hydrophobicity of the super-hydrophobic filter felt can be improved.
Example 9
A preparation method of a super-hydrophobic filter felt is different from that of the embodiment 6 in that in S2, a cationic fluorocarbon water repellent WG-405 is adopted as a water repellent agent in an aqueous solution.
The super-hydrophobic filter felt obtained in example 9 was subjected to wettability test, and the test results are shown in the following table.
As can be seen in combination with example 9 and the table above, the superhydrophobic filter felt obtained in example 9 has a contact angle of up to 164.3 ° of water drops on its surface, which is significantly higher than the superhydrophobic filter felt obtained in example 6. Therefore, in the preparation step of the super-hydrophobic filter felt, the cation fluorocarbon water repellent agent WG-405 is adopted as the water repellent agent, so that the hydrophobic effect of the obtained super-hydrophobic filter felt can be improved.
In the embodiment of the application, the cationic fluorocarbon water repellent adopts any one of cationic fluorocarbon water repellent FE-8110, cationic fluorocarbon water repellent WG-405 and cationic fluorocarbon water repellent FE-8200, and the influence on each performance result of the obtained superhydrophobic filter felt is the same. Therefore, the embodiments of the present application will be briefly described by taking the cationic fluorocarbon water repellent WG-405 as an example, but the application of other cationic fluorocarbon water repellents in the present application is not affected.
Examples 10 to 12
A method for preparing a superhydrophobic filter felt, which is different from example 9 in that in S2, the concentration of PTFE aqueous solution by mass percentage is different.
The super-hydrophobic filter mats obtained in examples 10 to 12 were subjected to wettability test, and the test results are shown in the following table.
As can be seen by combining examples 10-12 with the above table, the super-hydrophobic filter mats obtained in examples 10-12 have a contact angle of water drops on their surfaces as high as 164.8-165.1 degrees, which is significantly higher than the contact angle of the super-hydrophobic filter mat obtained in example 9. Therefore, in the preparation step of the super-hydrophobic filter felt, the mass percentage concentration of the PTFE aqueous solution is 15-20%, and the hydrophobic effect of the super-hydrophobic filter felt can be improved.
Examples 13 to 16
A method for preparing a superhydrophobic filter felt, which is different from example 11 in that in S2, the pre-needling and main needling process parameters are different.
The super-hydrophobic filter mats obtained in examples 13 to 16 were subjected to wettability test, and the test results are shown in the following table.
As can be seen by combining examples 13-15 with the above table, the super-hydrophobic filter mats obtained in examples 13-15 have a contact angle of water drops on their surfaces as high as 165.4-165.5 degrees, which is significantly higher than the contact angles of the super-hydrophobic filter mats obtained in examples 11, 16. Therefore, in the preparation step of the super-hydrophobic filter felt, the special needling process is adopted, so that the hydrophobic effect of the super-hydrophobic filter felt can be improved.
Example 17
A method for preparing a superhydrophobic filter felt is different from example 13 in that in S2, the shaping temperature is different.
The super-hydrophobic filter felt obtained in example 17 was subjected to wettability test, and the test results are shown in the following table.
In combination with example 17 and with the above table, it can be seen that the super-hydrophobic filter felt obtained in example 17 has a contact angle of up to 165.7 ° of water drops on its surface, which is significantly higher than the contact angle of the super-hydrophobic filter felt obtained in example 13. Therefore, in the preparation step of the super-hydrophobic filter felt, the special setting temperature and time are adopted, so that the hydrophobic effect of the super-hydrophobic filter felt can be improved to a certain extent.
Example 18
A method for preparing a super-hydrophobic filter felt is different from that of the embodiment 17 in that in S1, PTFE fibers are used for replacing aramid short fibers in an equivalent manner.
The super-hydrophobic filter felt obtained in example 18 was subjected to wettability test, and the test results are shown in the following table.
In combination with example 18 and with the table above, it can be seen that the super-hydrophobic filter felt obtained in example 18 has a contact angle of up to 166 ° of water drops on its surface, which is significantly higher than the contact angle of the super-hydrophobic filter felt obtained in example 17. Therefore, in the preparation step of the super-hydrophobic filter felt, PTFE fibers are adopted, so that the hydrophobic effect of the super-hydrophobic filter felt can be improved.
Comparative example
Comparative example 1
A method of making a filter felt differs from example 18 in that in S2 the hydroentangling speed and hydroentangling pressure are different.
The hydroentangling speed and hydroentangling pressure are shown in the following table.
Comparative example 3
A preparation method of a filter felt is different from that of the embodiment 18 in that in S2, a water repellent agent is a cation type organosilicon fluorine-free waterproof agent, and the model is REP-A, which is purchased from Suzhou Yuan Xinke chemical Co., ltd.
Comparative example 4
A method of making a filter felt differs from example 18 in that in S2, the water-jet is not impregnated with an aqueous PTFE solution.
Comparative example 5
A method of producing a filter felt, which differs from example 18 in that in S2, the needled felt is not hydroentangled.
The filter mats obtained in comparative examples 1 to 5 were subjected to wettability test, and the test results are shown in the following table.
As can be seen by combining comparative examples 1-5 with the above table, the filter mats obtained in comparative examples 1-5 were rated 2, 3 or 3-4 in water repellency, and the contact angle of water drops on the surface thereof was 132-152℃which is significantly lower than the water repellency and contact angle of the superhydrophobic filter mats obtained in example 18. Meanwhile, the rolling angle of water on the surface of the filter mats obtained in comparative examples 1 to 5 was 7.5 to 12 °, which is far higher than that of the superhydrophobic filter mat obtained in example 18. Therefore, the preparation steps of the super-hydrophobic filter felt provided by the application adopt special water jet, water repellent agent impregnation and PTFE aqueous solution impregnation processes to be combined, so that the anti-wetting performance of the super-hydrophobic filter felt is improved, and the super-hydrophobic filter felt has an excellent hydrophobic effect.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (9)
1. The preparation method of the super-hydrophobic filter felt is characterized by comprising the following steps of:
the cotton layer after lapping is needled, singed and calendared to obtain needled felt; carrying out water-jet needling on the needled felt, soaking in PTFE aqueous solution, carrying out primary drying and shaping, soaking in water repellent aqueous solution, and carrying out secondary drying treatment to obtain the super-hydrophobic filter felt;
wherein the water jet speed is 10-15m/min, and the water jet pressure is 300-340bar;
the water repellent is a cationic fluorocarbon water repellent.
2. The method for preparing the superhydrophobic filter felt according to claim 1, wherein the hydroentangling speed is 13-15m/min, and the hydroentangling pressure is 320-340bar.
3. The method for preparing a superhydrophobic filter felt according to claim 1, wherein the mass percentage concentration of the water repellent aqueous solution is 3-6%.
4. The method for preparing a superhydrophobic filter felt according to claim 1, wherein the cationic fluorocarbon water repellent is any one of cationic fluorocarbon water repellent FE-8110, cationic fluorocarbon water repellent WG-405 and cationic fluorocarbon water repellent FE-8200.
5. The method for preparing a superhydrophobic filter felt according to claim 1, wherein the concentration of the PTFE aqueous solution is 15-20% by mass.
6. The method for preparing the superhydrophobic filter felt according to claim 1, wherein the needling comprises pre-needling and main needling, the pre-needling has a needling depth of 10-20mm, a needling frequency of 500-750 needling/min, an input speed of 2.5-4.0m/min, and an output speed of 3.5-5.0m/min; the needling depth of the main needling is 5-9mm, the needling frequency is 550-650 needling/min, the input speed is 3-4m/min, and the output speed is 2-3m/min.
7. The method for preparing the superhydrophobic filter felt according to claim 1, wherein the shaping temperature is 200-220 ℃, and the shaping time is 5-6min.
8. The method of preparing a superhydrophobic filter felt according to claim 1, wherein the fibers in the needled felt are PTFE fibers.
9. A superhydrophobic filter felt characterized by being prepared by the method for preparing a superhydrophobic filter felt according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210361629.3A CN114768387B (en) | 2022-04-07 | 2022-04-07 | Super-hydrophobic filter felt and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210361629.3A CN114768387B (en) | 2022-04-07 | 2022-04-07 | Super-hydrophobic filter felt and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114768387A CN114768387A (en) | 2022-07-22 |
| CN114768387B true CN114768387B (en) | 2023-12-05 |
Family
ID=82426807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210361629.3A Active CN114768387B (en) | 2022-04-07 | 2022-04-07 | Super-hydrophobic filter felt and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114768387B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101530698A (en) * | 2009-03-10 | 2009-09-16 | 上海博格工业用布有限公司 | Non-woven filter felt combining air-laid web with pinprick reinforcement and production method |
| JP2012237073A (en) * | 2011-05-10 | 2012-12-06 | Kureha Ltd | Nonwoven fabric for substrate from which agent hardly oozes out |
| CN106012296A (en) * | 2016-06-20 | 2016-10-12 | 浙江严牌过滤技术股份有限公司 | Composite non-woven filter material and preparation method thereof |
| CN110341250A (en) * | 2019-07-04 | 2019-10-18 | 厦门三维丝环保股份有限公司 | A kind of dedicated nonwoven felt of water process |
| CN110917728A (en) * | 2019-12-16 | 2020-03-27 | 上海科格思过滤材料有限公司 | Spunlace splitting superfine filter felt and preparation method thereof |
| CN215662186U (en) * | 2021-04-20 | 2022-01-28 | 诸暨恒飞无纺科技有限公司 | Heat-preservation waterproof non-woven fabric |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109234910B (en) * | 2018-08-08 | 2019-08-06 | 南通纺织丝绸产业技术研究院 | Water repellent oleophylic composite needle nonwoven fabric and preparation method thereof |
-
2022
- 2022-04-07 CN CN202210361629.3A patent/CN114768387B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101530698A (en) * | 2009-03-10 | 2009-09-16 | 上海博格工业用布有限公司 | Non-woven filter felt combining air-laid web with pinprick reinforcement and production method |
| JP2012237073A (en) * | 2011-05-10 | 2012-12-06 | Kureha Ltd | Nonwoven fabric for substrate from which agent hardly oozes out |
| CN106012296A (en) * | 2016-06-20 | 2016-10-12 | 浙江严牌过滤技术股份有限公司 | Composite non-woven filter material and preparation method thereof |
| CN110341250A (en) * | 2019-07-04 | 2019-10-18 | 厦门三维丝环保股份有限公司 | A kind of dedicated nonwoven felt of water process |
| CN110917728A (en) * | 2019-12-16 | 2020-03-27 | 上海科格思过滤材料有限公司 | Spunlace splitting superfine filter felt and preparation method thereof |
| CN215662186U (en) * | 2021-04-20 | 2022-01-28 | 诸暨恒飞无纺科技有限公司 | Heat-preservation waterproof non-woven fabric |
Non-Patent Citations (1)
| Title |
|---|
| 拒水防油针刺毡滤料的应用与生产实践;黄族健;;产业用纺织品(12);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114768387A (en) | 2022-07-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0066414B1 (en) | Filter of poly(tetrafluoroethylene) | |
| CA2033594C (en) | Apparatus for producing textured nonwoven fabric and related method of manufacture | |
| CN101406780B (en) | Filter material and use | |
| CN100489174C (en) | Production process of polytetrafluoroethylene fiber acupuncture filtering felt | |
| CN106582112B (en) | A kind of semi-dry desulphurization gas cleaning filtrate and preparation method thereof | |
| CN111013255B (en) | Preparation method of micro/nano fiber aerogel composite filter material | |
| EP4001487A1 (en) | Fiber structure and production method therefor | |
| CN107604532B (en) | Surface layer material of filter bag, flue gas treatment system and treatment method | |
| RU2213819C2 (en) | Double glass fiber mixtures for combing | |
| CN106310789B (en) | A kind of super fine fibre ultra-clean filtering high temperature filtrate of low grammes per square metre and preparation method thereof | |
| CN110983812A (en) | Non-woven composite material with heat insulation characteristic and preparation method thereof | |
| CN105688511B (en) | Ultra-low emission superfine surface layer polyimide fiber composite needled felt and preparation method thereof | |
| CN114768387B (en) | Super-hydrophobic filter felt and preparation method thereof | |
| CN105709504A (en) | High-efficiency spunlace filter material and preparing method thereof | |
| CN102836592B (en) | Carbon fiber and basalt composite filtering material | |
| US6844275B2 (en) | Heat-resistant fabric and method for production thereof | |
| CN111962304B (en) | Preparation process and application of water-repellent antistatic non-woven fabric | |
| CN110552114B (en) | High-temperature-resistant superfine composite fiber air purification textile and preparation method thereof | |
| CN113183555A (en) | Breathable and dry double-layer non-woven fabric and processing technology thereof | |
| JPH11137930A (en) | Heat-resistant filter material | |
| CN105498361A (en) | Polyester-ultrafine fiber composite nonwoven filter felt and making method thereof | |
| CN110055681A (en) | With filtering and the planting blanket of suction-operated and preparation method thereof | |
| Yeo et al. | Effects of processing condition on the filtration performances of nonwovens for bag filter media | |
| CN107485924A (en) | A kind of waste incineration station anti-static inflaming-retarding needled filtering felt and its manufacture method | |
| CN113403747A (en) | Degradable non-woven fabric and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |