CN112023525B - Self-cleaning purification filter cloth and preparation method thereof - Google Patents

Self-cleaning purification filter cloth and preparation method thereof Download PDF

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CN112023525B
CN112023525B CN202010928707.4A CN202010928707A CN112023525B CN 112023525 B CN112023525 B CN 112023525B CN 202010928707 A CN202010928707 A CN 202010928707A CN 112023525 B CN112023525 B CN 112023525B
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filter cloth
self
twisted
preparation
fiber
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CN112023525A (en
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林仁文
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Zhejiang Tiantai Tianfeng Filter Material Co ltd
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Zhejiang Tiantai Tianfeng Filter Material Co ltd
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Priority to PCT/CN2021/098398 priority patent/WO2022048219A1/en
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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
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
    • D02G3/04—Blended or other yarns or threads containing components made from different materials
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
    • D03D13/008—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft characterised by weave density or surface weight
    • 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
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C23/00—Making patterns or designs on fabrics
    • D06C23/04—Making patterns or designs on fabrics by shrinking, embossing, moiréing, or crêping
    • 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
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/51—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with sulfur, selenium, tellurium, polonium or compounds thereof
    • D06M11/55—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with sulfur, selenium, tellurium, polonium or compounds thereof with sulfur trioxide; with sulfuric acid or thiosulfuric acid or their salts
    • D06M11/57—Sulfates or thiosulfates of elements of Groups 3 or 13 of the Periodic Table, e.g. alums
    • 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
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
    • D06M11/76—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon oxides or carbonates
    • 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
    • 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
    • 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
    • D06M2101/16—Synthetic fibres, other than mineral fibres
    • D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M2101/34—Polyamides
    • 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
    • D06M2200/11—Oleophobic properties
    • 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
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2101/00—Inorganic fibres
    • D10B2101/02—Inorganic fibres based on oxides or oxide ceramics, e.g. silicates
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Filtering Materials (AREA)

Abstract

The invention belongs to the field of industrial filter cloth, and particularly relates to a self-cleaning purification filter cloth and a preparation method thereof. The Z-twisted nylon fiber soaked with sodium bicarbonate and the S-twisted composite fiber coated with the polytetrafluoroethylene emulsion containing alum are twisted and stranded according to Z, and the obtained stranded yarn generates gas in the process, so that the stranded yarn keeps good micropores, and micropores exist in polytetrafluoroethylene film forming; weaving according to a plain weave, wherein the warp density of the plied yarns is 120 warps/cm and the weft density of the plied yarns is 90 wefts/cm; and carrying out hot-pressing and shaping on the obtained grey cloth by a pressing roller with uniformly distributed array concave points at 140-. The filter cloth obtained by the invention is not easy to adhere to fine particles and has good self-cleaning property, thereby effectively solving the problem of blockage of micropores of the filter cloth.

Description

Self-cleaning purification filter cloth and preparation method thereof
Technical Field
The invention belongs to the field of industrial filter cloth, and particularly relates to a self-cleaning purification filter cloth and a preparation method thereof.
Background
The filter cloth is mainly woven by nylon fiber, polypropylene fiber and the like. Because of good acid and alkali corrosion resistance and wear resistance, the copper alloy has wide application in the fields of chemical industry, metallurgy and the like, such as fluid liquid/solid separation, material purification, industrial filter press, centrifuge filter cloth, copper smelting, recycling and the like. Therefore, the most basic requirements of the filter cloth are good air permeability, quick water leakage, convenient cleaning and long-term use.
In general, the filtration porosity of the filter cloth is controlled by the fineness of the warp and weft and the interweaving density of the warp and weft. Particularly, with the increase of the filtration requirement, the filtration precision of the filter cloth commonly used at present reaches 0.005 μm, so the interweaving density of the warp and the weft is high. As the filtration accuracy increases, the filter cloth faces a problem in that the micropores are blocked. In general, gaps formed by interweaving warp yarns and weft yarns of the filter cloth are extremely small, and along with the reduction of the particle size of the filtered particles, fine particles are easy to stay and accumulate in the gaps formed by interweaving the warp yarns and the weft yarns, so that micropores of the filter cloth gradually become small until the filter cloth is blocked, the filtering efficiency is reduced, and the cleaning is difficult. Frequent cleaning of the filter cloth can cause reduction of the filter precision of the filter cloth and shortening of the service life.
At present, related technical reports on the aspect of solving the problem of hole blockage of the filter cloth are provided. For example, chinese patent publication No. CN103952914A discloses a method for manufacturing a membrane-covered filter cloth by a wet process, in which a coating agent of an organic polymer material having high porosity, smooth surface, good elasticity and good wear resistance is dip-coated on the filter cloth, and then the filter cloth coated with the coating agent is immersed in a coagulation bath, and the temperature and residence time of the coagulation bath are controlled and adjusted to obtain the desired porosity and membrane thickness; the obtained membrane-covered filter cloth changes deep filtration into surface filtration, so that filtered materials cannot be gathered in pores among yarns of the filter cloth, and the filtered materials are prevented from being blocked in the pores of the filter cloth.
The film coating on the surface of the filter cloth is a common technology for solving the problem of micropore blockage at present, and the coating film is mainly combined with the base cloth in a hot pressing or bonding mode. However, on the one hand, the coating film easily comes off the base fabric; on the other hand, filterable function falls on the coating film entirely for the coating film is direct to be strikeed the contact with by the filter material, and wearing and tearing are great, and micropore shape grow, and filtering resistance grow, and filtration efficiency reduces.
As known to those skilled in the art, most of the current filter cloths adopt woven fabrics, and the filter cloths have good filtering effect because of micropores of fibers and interstitial micropores formed by interweaving the woven fabrics. The filter cloth plays an important role in solid-liquid separation, gas-phase solid-phase separation, dust removal and the like. However, in the process of filtration, because the fiber adsorption of the woven fabric is strong, particles or dust are easy to adhere and gradually block micropores, which affects the production. A typical example is: after the nanometer inorganic powder is ground by the jet mill, high-speed airflow and the nanometer powder need to be filtered and separated by the filter cloth, and the nanometer inorganic powder is easy to enter micropores of woven fabrics and plug the micropores due to small particle size of the nanometer inorganic powder and the high-speed airflow. The skilled person tries to improve on the structure and coating to prevent the clogging problem of the filter cloth pores, but according to the customer feedback, direct coating leads to increased filtration resistance and reduced filtration efficiency.
Disclosure of Invention
Aiming at the problem that the fabric micropores of the filter-pressing filter cloth and the dust-removing filter cloth are easy to be blocked by fine particles and fine dust, compared with the defects of large filtering resistance and low efficiency of the micropore blocking existing in the prior art which adopts the coating film, the invention provides the self-cleaning purification filter cloth. Further, a preparation method for obtaining the self-cleaning purification filter cloth is specifically disclosed.
In order to achieve the technical effects, the invention firstly provides a preparation method of a self-cleaning purification filter cloth, which is characterized by comprising the following steps:
(1) preparing sodium bicarbonate into a solution with the mass concentration of 8%, loading the solution into a soaking tank, then enabling 30-50 nylon fibers twisted by Z to pass through the soaking tank, adsorbing the sodium bicarbonate solution, and performing filter pressing to remove redundant sodium bicarbonate solution for later use;
(2) adding alum into polytetrafluoroethylene emulsion, dispersing uniformly to obtain coating liquid, and dip-coating 30-50S twisted composite fibers into the coating liquid;
(3) stranding the Z-twisted nylon fiber pretreated in the step (1) and the S-twisted composite fiber pretreated in the step (2) according to a Z-twisting mode to form a folded yarn;
(4) continuously feeding the folded yarn obtained in the step (3) into a drying box, and staying in the drying box for 30-50s to enable the polytetrafluoroethylene emulsion to form a microporous film on the folded yarn;
(5) weaving the plied yarns obtained in the step (4) according to a plain weave, wherein the weaving warp density is 120 warps/cm, and the weaving weft density is 90 wefts/cm; and carrying out hot-pressing and shaping on the obtained grey cloth by a pressing roller with uniformly distributed array concave points at 140-.
Preferably, in the step (2), the S-twisted 30-50 composite fibers are fiber yarns compositely twisted by alumina fibers and nylon fibers. The proportion of the alumina fiber is 15-20%. The performance of the filter cloth in the aspects of wear resistance and aging resistance is improved by the composite alumina fiber.
Preferably, the polytetrafluoroethylene emulsion in step (2) is a high-concentration polytetrafluoroethylene aqueous dispersion with a solid content of 60 wt%. The polytetrafluoroethylene emulsion is dip-coated with the S-twisted composite fiber, so that the composite fiber has good hydrophobic and oleophobic properties, and the stranded yarn has self-cleaning property after stranding. Different from coating polytetrafluoroethylene emulsion on the surface of base cloth, the polytetrafluoroethylene emulsion is coated on twisted yarn fibers and then stranded, so that the whole stranded yarn has good self-cleaning property and cannot fall off.
Preferably, the adding amount of the alum in the step (2) is 3-5% of the mass of the polytetrafluoroethylene emulsion. Sodium bicarbonate is soaked in the Z-twist nylon fibers, and the S-twist composite fibers are dip-coated with the polytetrafluoroethylene emulsion containing alum, so that the sodium bicarbonate and the alum generate gas during stranding, the stranded yarn keeps good micropores, and the micropores exist in polytetrafluoroethylene film forming, so that the micropores of the stranded yarn are greatly ensured. The aluminum hydroxide colloid produced by the reaction acts as a secondary binder for the strand, so that the fibers are tightly held together when the Z-twist is plied.
Preferably, the temperature of the drying box in the step (4) is set to be 100-110 ℃.
Preferably, the radius of the concave points of the array in the step (5) is 0.5 mm; through compression roller hot pressing and shaping, the surface of the filter cloth is distributed with salient points, and the filter material and the micro dust are further prevented from being adhered to the surface of the filter cloth.
Furthermore, the invention provides a self-cleaning purification filter cloth prepared by the method, which is characterized in that, the folded yarn of the self-cleaning purification filter cloth is formed by twisting 30-50 pieces of Z-twisted nylon fiber and 30-50 pieces of S-twisted composite fiber according to Z, because 30-50Z-twisted nylon fibers are soaked in sodium bicarbonate solution in advance, 30-50S-twisted composite fibers are coated with polytetrafluoroethylene emulsion containing alum in advance, during the stranding, the sodium bicarbonate and the alum generate gas, so that the stranded wire keeps good micropores, the polytetrafluoroethylene film has micropores, the micropores of the stranded wire are greatly ensured, meanwhile, the hydrophobic and oleophobic properties of the polytetrafluoroethylene membrane of the folded yarn enable the folded yarn to have good self-cleaning property, fine particles are not easy to adhere to the woven filter cloth, and the folded yarn has good self-cleaning property, so that the problem of blockage of micropores of the filter cloth is effectively solved. The polytetrafluoroethylene emulsion is used for treating the yarns, plying and generating gas, and the polytetrafluoroethylene is firm in the plied yarns and is not easy to fall off while keeping micropores of the plied yarns and self-cleaning.
Compared with the prior art, the self-cleaning purification filter cloth and the preparation method thereof have the outstanding characteristics and remarkable progress that:
(1) according to the invention, the Z-twisted nylon fiber soaked with sodium bicarbonate and the S-twisted composite fiber coated with the polytetrafluoroethylene emulsion containing alum are twisted and plied according to Z, and the obtained plied yarn generates gas in the process, so that the plied yarn keeps good micropores, and the polytetrafluoroethylene film has micropores, so that the micropores of the plied yarn are greatly ensured, and meanwhile, the hydrophobic and oleophobic properties of the polytetrafluoroethylene film of the plied yarn enable the plied yarn to have good self-cleaning property.
(2) The invention solves the problem that the coating is easy to fall off when being directly coated on the base fabric, and the polytetrafluoroethylene is firm in the folded yarn and is not easy to fall off.
(3) Compared with the method of directly coating the coating on the base cloth, the method of the invention fully utilizes the filtering performance of the filter, and has the advantages of small filtering resistance and high filtering efficiency.
(4) The filter cloth prepared by the invention is not easy to adhere to fine particles, has good self-cleaning performance, reduces the cleaning dust and the cleaning frequency, and prolongs the service life of the filter cloth.
Drawings
The self-cleaning purification filter cloth of the invention is further explained by combining the attached drawings as follows:
FIG. 1 is a structural view of a self-cleaning filter cloth according to the present invention. In the figure: 1-distributed salient points of the filter cloth.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without any inventive step based on the technical idea of the present invention shall fall within the scope of protection of the present invention.
The raw materials used are as follows:
high-concentration polytetrafluoroethylene aqueous phase dispersion: the type is FR301B, and is polytetrafluoroethylene aqueous phase dispersion containing nonionic surfactant stabilizer provided by Shanghai Sanai Rich New Material science and technology Limited.
The nylon fiber is nylon-66 fiber.
Example 1
(1) Preparing sodium bicarbonate into a solution with the mass concentration of 8%, loading the solution into a soaking tank, then enabling 30 pieces of Z twisted nylon fibers to pass through the soaking tank, adsorbing the sodium bicarbonate solution, and performing filter pressing to remove the redundant sodium bicarbonate solution for later use;
(2) adding alum into a high-concentration polytetrafluoroethylene aqueous phase dispersion liquid (the commercial model is FR301B) with the solid content of 60wt% to be uniformly dispersed to obtain a coating liquid, and dip-coating 30S-twisted composite fibers into the coating liquid; the adding amount of the alum is 5 percent of the mass of the polytetrafluoroethylene emulsion; the composite fiber is a fiber yarn which is formed by twisting alumina fiber and polyamide fiber in a composite mode, and the proportion of the alumina fiber is 20%;
(3) stranding the Z-twisted nylon fiber pretreated in the step (1) and the S-twisted composite fiber pretreated in the step (2) according to a Z-twisting mode to form a folded yarn;
(4) continuously feeding the stranded wire obtained in the step (3) into a drying box, wherein the temperature of the drying box is set to be 100-110 ℃, and the stay time in the drying box is 30s, so that the polytetrafluoroethylene emulsion forms a microporous membrane on the stranded wire;
(5) weaving the plied yarns obtained in the step (4) according to a plain weave, wherein the weaving warp density is 120 warps/cm, and the weaving weft density is 90 wefts/cm; and (3) carrying out hot-pressing and shaping on the obtained grey cloth by a compression roller uniformly distributed with array concave points with the radius of 0.5mm at 140 ℃, sealing edges, and coiling to obtain the self-cleaning purification filter cloth with the convex points distributed on the surface. As shown in the attached figure 1, 1 is the distributed salient points of the filter cloth, which is beneficial to the smooth separation of the filter material from the filter cloth.
Example 2
(1) Preparing sodium bicarbonate into a solution with the mass concentration of 8%, loading the solution into a soaking tank, then enabling 40 pieces of Z twisted nylon fibers to pass through the soaking tank, adsorbing the sodium bicarbonate solution, and performing filter pressing to remove the redundant sodium bicarbonate solution for later use;
(2) adding alum into a high-concentration polytetrafluoroethylene aqueous phase dispersion liquid (the commercial model is FR301B) with the solid content of 60wt% to be uniformly dispersed to obtain a coating liquid, and dip-coating 40S-twisted composite fibers into the coating liquid; the adding amount of the alum is 3 percent of the mass of the polytetrafluoroethylene emulsion; the composite fiber is a fiber yarn which is formed by twisting alumina fiber and polyamide fiber in a composite mode, and the proportion of the alumina fiber is 20%;
(3) stranding the Z-twisted nylon fiber pretreated in the step (1) and the S-twisted composite fiber pretreated in the step (2) according to a Z-twisting mode to form a folded yarn;
(4) continuously feeding the stranded wire obtained in the step (3) into a drying box, wherein the temperature of the drying box is set to be 100-110 ℃, and the stay time in the drying box is 30s, so that the polytetrafluoroethylene emulsion forms a microporous membrane on the stranded wire;
(5) weaving the plied yarns obtained in the step (4) according to a plain weave, wherein the weaving warp density is 120 warps/cm, and the weaving weft density is 90 wefts/cm; and (3) carrying out hot-pressing and shaping on the obtained grey cloth by a compression roller which uniformly distributes array concave points with the radius of 0.5mm at 150 ℃, sealing edges, and coiling to obtain the self-cleaning purification filter cloth with the convex points distributed on the surface.
Example 3
(1) Preparing sodium bicarbonate into a solution with the mass concentration of 8%, loading the solution into a soaking tank, then enabling 50 pieces of Z twisted nylon fiber to pass through the soaking tank, adsorbing the sodium bicarbonate solution, and performing filter pressing to remove the redundant sodium bicarbonate solution for later use;
(2) adding alum into a high-concentration polytetrafluoroethylene aqueous phase dispersion liquid (the commercial model is FR301B) with the solid content of 60wt% to be uniformly dispersed to obtain a coating liquid, and dip-coating 50S twisted composite fibers into the coating liquid; the adding amount of the alum is 5 percent of the mass of the polytetrafluoroethylene emulsion; the composite fiber is a fiber yarn which is formed by twisting alumina fiber and nylon fiber in a composite mode, and the proportion of the alumina fiber is 15%;
(3) stranding the Z-twisted nylon fiber pretreated in the step (1) and the S-twisted composite fiber pretreated in the step (2) according to a Z-twisting mode to form a folded yarn;
(4) continuously feeding the stranded wire obtained in the step (3) into a drying box, wherein the temperature of the drying box is set to be 100-110 ℃, and the stay time in the drying box is 50s, so that the polytetrafluoroethylene emulsion forms a microporous membrane on the stranded wire;
(5) weaving the plied yarns obtained in the step (4) according to a plain weave, wherein the weaving warp density is 120 warps/cm, and the weaving weft density is 90 wefts/cm; and (3) carrying out hot-pressing and shaping on the obtained grey cloth by a compression roller with uniformly distributed array concave points with the radius of 0.5mm at 160 ℃, sealing edges, and coiling to obtain the self-cleaning purification filter cloth with the convex points distributed on the surface.
Comparative example 1
(1) Preparing sodium bicarbonate into a solution with the mass concentration of 8%, loading the solution into a soaking tank, then enabling 30 pieces of Z twisted nylon fibers to pass through the soaking tank, adsorbing the sodium bicarbonate solution, and performing filter pressing to remove the redundant sodium bicarbonate solution for later use;
(2) taking high-concentration polytetrafluoroethylene aqueous dispersion (the commercial model is FR301B) with the solid content of 60wt% as coating liquid, and dip-coating 30S twisted composite fibers with the coating liquid; the composite fiber is a fiber yarn which is formed by twisting alumina fiber and polyamide fiber in a composite mode, and the proportion of the alumina fiber is 20%;
(3) stranding the Z-twisted nylon fiber pretreated in the step (1) and the S-twisted composite fiber pretreated in the step (2) according to a Z-twisting mode to form a folded yarn;
(4) continuously feeding the stranded wire obtained in the step (3) into a drying box, wherein the temperature of the drying box is set to be 100-110 ℃, and the polytetrafluoroethylene emulsion stays in the drying box for 30s to form a film on the stranded wire;
(5) weaving the plied yarns obtained in the step (4) according to a plain weave, wherein the weaving warp density is 120 warps/cm, and the weaving weft density is 90 wefts/cm; and (3) carrying out hot-pressing and shaping on the obtained grey cloth by a compression roller uniformly distributed with array concave points with the radius of 0.5mm at 140 ℃, sealing edges, and coiling to obtain the self-cleaning purification filter cloth with the convex points distributed on the surface.
Comparative example 2
(1) Preparing sodium bicarbonate into a solution with the mass concentration of 8%, loading the solution into a soaking tank, then enabling 30 pieces of Z twisted nylon fibers to pass through the soaking tank, adsorbing the sodium bicarbonate solution, and performing filter pressing to remove the redundant sodium bicarbonate solution for later use;
(2) adding alum into water to form a solution, taking the solution as a coating solution, and dip-coating 30S twisted composite fibers into the coating solution; the composite fiber is a fiber yarn which is formed by twisting alumina fiber and polyamide fiber in a composite mode, and the proportion of the alumina fiber is 20%;
(3) stranding the Z-twisted nylon fiber pretreated in the step (1) and the S-twisted composite fiber pretreated in the step (2) according to a Z-twisting mode to form a folded yarn;
(4) continuously feeding the stranded wire obtained in the step (3) into a drying box, wherein the temperature of the drying box is set to be 100-110 ℃, and the stranded wire stays in the drying box for 30 s;
(5) weaving the plied yarns obtained in the step (4) according to a plain weave, wherein the weaving warp density is 120 warps/cm, and the weaving weft density is 90 wefts/cm; and (3) carrying out hot-pressing and shaping on the obtained grey cloth by a compression roller uniformly distributed with array concave points with the radius of 0.5mm at 140 ℃, sealing edges, and coiling to obtain the self-cleaning purification filter cloth with the convex points distributed on the surface.
Comparative example 3
(1) Plying 30Z-twisted nylon fibers and 30S-twisted composite fibers in a Z-twisting manner to form a folded yarn; the composite fiber is a fiber yarn which is formed by twisting alumina fiber and polyamide fiber in a composite mode, and the proportion of the alumina fiber is 20%;
(2) weaving the obtained folded yarn according to a plain weave, wherein the weaving warp density is 120 warps/cm, and the weft density is 90 warps/cm; carrying out hot-press forming on the obtained grey cloth by a compression roller with uniformly distributed array concave points with the radius of 0.5mm at 140 ℃;
(3) and adding sodium bicarbonate and alum into the polytetrafluoroethylene emulsion, quickly coating the polytetrafluoroethylene emulsion on the surface of the formed gray fabric, and drying to obtain the filter cloth with the coating.
Comparative example 4
(1) Preparing sodium bicarbonate into a solution with the mass concentration of 8%, loading the solution into a soaking tank, then enabling 30 pieces of Z twisted nylon fibers to pass through the soaking tank, adsorbing the sodium bicarbonate solution, and performing filter pressing to remove the redundant sodium bicarbonate solution for later use;
(2) adding alum into a high-concentration polytetrafluoroethylene aqueous phase dispersion liquid (the commercial model is FR301B) with the solid content of 60wt% to be uniformly dispersed to obtain a coating liquid, and dip-coating 30S-twisted composite fibers into the coating liquid; the adding amount of the alum is 5 percent of the mass of the polytetrafluoroethylene emulsion; the composite fiber is a fiber yarn which is formed by twisting alumina fiber and polyamide fiber in a composite mode, and the proportion of the alumina fiber is 20%;
(3) stranding the Z-twisted nylon fiber pretreated in the step (1) and the S-twisted composite fiber pretreated in the step (2) according to a Z-twisting mode to form a folded yarn;
(4) continuously feeding the stranded wire obtained in the step (3) into a drying box, wherein the temperature of the drying box is set to be 100-110 ℃, and the stay time in the drying box is 30s, so that the polytetrafluoroethylene emulsion forms a microporous membrane on the stranded wire;
(5) weaving the plied yarns obtained in the step (4) according to a plain weave, wherein the weaving warp density is 120 warps/cm, and the weaving weft density is 90 wefts/cm; and (5) edge sealing and coiling to obtain the self-cleaning purification filter cloth with the salient points distributed on the surface.
Firstly, the filter cloths obtained in examples 1 to 3 and comparative examples 1 to 4 were tested for wetting angle, air permeability and filtration resistance according to the technical requirements of environmental protection products in the filter material for bag house (HJT 326-2006).
1. Contact angle: water and 1, 2 dichloromethane (oil) were dropped on the surface of the filter cloth by a needle tube, and the water contact angle and the oil contact angle of the surface of the filter cloth were observed as shown in table 1.
2. Air permeability: reference GB/T5453 (determination of air Permeability of woven Fabric), test area 20cm2The pressure difference across the test face was 100Pa, and the air permeability was as shown in Table 1.
3. Dynamic filtration resistance: the dynamic resistance of the filter cloth was tested with reference to HJ 324-20066.3 (filter material for bag house product specifications) and the test data are shown in table 1.
Table 1:
Figure BDA0002669402570000071
secondly, the filter cloth obtained in the examples 1-3 and the comparative examples 1-4 is used for filtering production of nitric acid leaching electrolytic copper anode mud, the continuous filtration is carried out for 20 times, and no flushing is needed after filter cakes are removed each time; after the 20 th filtration, the filter cake was removed, the filter cloth was rinsed with a water gun and dried, and the air permeability and filtration resistance were tested as shown in table 2.
Table 2:
Figure BDA0002669402570000072
Figure BDA0002669402570000081
through the performance test of the filter cloth and the filtration resistance test after use, the filter cloth obtained by the invention has hydrophobic and oleophobic properties, keeps good air permeability and lower filtration resistance, and effectively prevents fine particles from adhering and blocking micropores of the filter cloth. Comparative example 1 alum was not added to the coating solution for treating S-twisted 30 composite fibers, so that micropores of the gas-assisted strand were not retained during stranding, and sufficient micropores were not formed after polytetrafluoroethylene film formation, and although the self-cleaning property of the strand was good, the filtration resistance of the woven filter cloth was large, and the filtration efficiency was low; in comparative example 2, no polytetrafluoroethylene emulsion was added when processing S-twisted 30 composite fibers, and the resulting strands had poor self-cleaning properties and were prone to adhering fine particles; comparative example 3 is a filter cloth treated for the customer at the previous stage, using the current conventional technique of applying a coating to a base cloth. Although the technology forms micropores on the coating and is self-cleaning, the filtering resistance is large and the filtering efficiency is low; comparative example 4 does not design the bump on the filter cloth surface, although the micropore is difficult for adhesion to block up to fine particle, but the phenomenon of adhesion exists in the large granule, and the filter material shake-off degree of difficulty is big, has the influence to production efficiency.

Claims (7)

1. A preparation method of a self-cleaning purification filter cloth is characterized by comprising the following steps:
(1) preparing sodium bicarbonate into a solution with the mass concentration of 8%, loading the solution into a soaking tank, then enabling 30-50 nylon fibers twisted by Z to pass through the soaking tank, adsorbing the sodium bicarbonate solution, and performing filter pressing to remove the redundant sodium bicarbonate solution for later use;
(2) adding alum into polytetrafluoroethylene emulsion, dispersing uniformly to obtain coating liquid, and dip-coating 30-50S twisted composite fibers into the coating liquid;
(3) stranding the Z-twisted nylon fiber pretreated in the step (1) and the S-twisted composite fiber pretreated in the step (2) according to a Z-twisting mode to form a folded yarn;
(4) continuously feeding the folded yarns obtained in the step (3) into a drying box, and staying in the drying box for 30-50s to enable polytetrafluoroethylene emulsion to form microporous films between the folded yarns and on the folded yarns;
(5) weaving the plied yarns obtained in the step (4) according to a plain weave, wherein the weaving warp density is 120 warps/cm, and the weaving weft density is 90 wefts/cm; and carrying out hot-pressing and shaping on the obtained grey cloth by a pressing roller with uniformly distributed array concave points at 140-.
2. The preparation method of the self-cleaning purification filter cloth according to claim 1, which is characterized in that: in the step (2), the S-twisted 30-50 composite fibers are fiber yarns which are compositely twisted by alumina fibers and nylon fibers; the proportion of the alumina fiber is 15-20%.
3. The preparation method of the self-cleaning purification filter cloth according to claim 1, which is characterized in that: in the step (2), the polytetrafluoroethylene emulsion is a high-concentration polytetrafluoroethylene aqueous phase dispersion liquid with the solid content of 60 wt%.
4. The preparation method of the self-cleaning purification filter cloth according to claim 1, which is characterized in that: in the step (2), the adding amount of the alum is 3-5% of the mass of the polytetrafluoroethylene emulsion.
5. The preparation method of the self-cleaning purification filter cloth according to claim 1, which is characterized in that: in the step (4), the temperature of the drying box is set to be 100-110 ℃.
6. The preparation method of the self-cleaning purification filter cloth according to claim 1, which is characterized in that: and (5) the radius of the array concave points is 0.5 mm.
7. A self-cleaning filter cloth prepared by the preparation method of any one of claims 1 to 6.
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US4025679A (en) * 1976-08-06 1977-05-24 W. L. Gore & Associates, Inc. Fibrillated polytetrafluoroethylene woven filter fabric
DE19820560A1 (en) * 1998-05-08 1999-11-11 Mgf Gutsche & Co Gmbh Betriebs Filter material of woven glass fibers
CN100423819C (en) * 2006-06-23 2008-10-08 武汉大学 Hollow carbon fibre, its synthesis and use
CN102787416B (en) * 2012-05-02 2014-04-30 浙江格尔泰斯环保特材科技有限公司 Polytetrafluoroethylene fiber screen cloth and manufacture method of polytetrafluoroethylene fiber screen cloth
CN103381325B (en) * 2013-06-25 2015-04-22 安徽凤凰滤清器股份有限公司 Bauxite structural filter core and preparation method thereof
CN103381320B (en) * 2013-06-25 2015-08-05 安徽凤凰滤清器股份有限公司 A kind of filtering micropore filter core and preparation method thereof
CN103806165A (en) * 2013-12-30 2014-05-21 浙江国力科技有限公司 Warp and weft forwards and backwards entwisted white body obliquely-interwoven fabric
CN104971547B (en) * 2015-06-19 2017-03-29 东华大学 A kind of preparation method of three-dimensional orthogonal fabric baghose cleaner with high temperature air filtration material
CN109849463A (en) * 2019-04-01 2019-06-07 安徽省太和县众友筛网滤布制造有限公司 A kind of the composite industrial filter cloth and its production method of resistance to deformation
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