CN114523742A - Normal-temperature blended three-proofing filter bag and preparation method thereof - Google Patents

Normal-temperature blended three-proofing filter bag and preparation method thereof Download PDF

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CN114523742A
CN114523742A CN202210118816.9A CN202210118816A CN114523742A CN 114523742 A CN114523742 A CN 114523742A CN 202210118816 A CN202210118816 A CN 202210118816A CN 114523742 A CN114523742 A CN 114523742A
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filter bag
proofing
normal
temperature
preparation
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CN114523742B (en
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徐清清
充荣强
杨文军
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Guangde Huilong Environmental Protection Technology Co ltd
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Guangde Huilong Environmental Protection Technology Co ltd
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    • 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
    • D06M15/263—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof
    • D06M15/277—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof containing fluorine
    • 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
    • B32B5/022—Non-woven fabric
    • 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
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    • 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
    • D06M11/32—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 oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
    • D06M11/36—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 oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
    • D06M11/49—Oxides or hydroxides of elements of Groups 8, 9,10 or 18 of the Periodic Table; Ferrates; Cobaltates; Nickelates; Ruthenates; Osmates; Rhodates; Iridates; Palladates; Platinates
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    • 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
    • D06M11/74—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 or graphite; with carbides; with graphitic acids or their salts
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    • 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
    • D06M15/263—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof
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    • 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
    • D06M15/356—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of other unsaturated compounds containing nitrogen, sulfur, silicon or phosphorus atoms
    • D06M15/3562—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of other unsaturated compounds containing nitrogen, sulfur, silicon or phosphorus atoms containing nitrogen
    • 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
    • B32B2262/0253—Polyolefin 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
    • B32B2262/0276—Polyester 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
    • B32B2262/0276—Polyester fibres
    • B32B2262/0284—Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT]
    • 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
    • B32B2262/10—Inorganic 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
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/21—Anti-static
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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    • D06M2101/16—Synthetic fibres, other than mineral fibres
    • D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M2101/22—Polymers or copolymers of halogenated mono-olefins
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    • D06M2101/16—Synthetic fibres, other than mineral fibres
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    • D06M2200/10—Repellency against liquids
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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Filtering Materials (AREA)

Abstract

The invention relates to a normal-temperature blended three-proofing filter bag and a preparation method thereof, belonging to the technical field of dustproof filter bag preparation, wherein the preparation process comprises the following steps: firstly, laying fiber nets subjected to opening treatment on two sides of base cloth, and compounding the fiber nets on the base cloth by using a needling process to obtain filter bag fabrics; and secondly, mixing a three-proofing finishing agent with water to soak the fabric of the filter bag, soaking for two times and rolling for two times, pre-drying for 8-12min at the temperature of 150 plus materials and 170 ℃, then drying for 4-6h at the temperature of 180 plus materials and 200 ℃, cutting and sewing to obtain the normal-temperature blended three-proofing filter bag, adding hybrid particles and polymerization monomers to prepare the efficient three-proofing finishing agent through an emulsion polymerization method, and applying the three-proofing finishing agent in the filter bag to ensure that the three-proofing filter bag not only has higher water repellency, oil repellency and antistatic property, but also has excellent flame retardant property and mechanical property.

Description

Normal-temperature blended three-proofing filter bag and preparation method thereof
Technical Field
The invention belongs to the technical field of dustproof filter bag preparation, and particularly relates to a normal-temperature blended three-proofing filter bag and a preparation method thereof.
Background
Along with the continuous improvement of environmental protection requirement, some factories with exhaust gas and dust attach importance to environmental protection increasingly, when the concentration of industrial dust reaches a certain degree (namely explosion limit), if meet factors such as electrostatic discharge spark or external ignition, then explosion and fire hazard are easily caused, so the factory reduces the generation of dust by arranging a dust remover, but the air dust in the operation of the dust remover contains more moisture and oiliness, hygroscopicity, easily soluble dust, the deashing difficulty appears, therefore, a three-proofing filter bag is provided, the three-proofing filter bag combines the advantages of water resistance, oil resistance and static resistance, compared with a common filter material, the three-proofing filter bag has higher practicability.
The existing three-proofing filter bag does not have flame retardant performance, the concentration range of dust such as combustible gas such as hydrogen, carbon monoxide, methane and acetylene or dust such as grain and aluminum in dust-containing air generated by some special factories reaches, severe explosion can be generated when the dust meets a fire source, and a flame retardant and antistatic dust removal cloth bag is particularly needed under the condition.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a normal-temperature blended three-proofing filter bag and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
a normal temperature blending three-proofing filter bag comprises a base cloth layer and fiber mesh layers, wherein the fiber mesh layers are respectively arranged on two sides of the base cloth layer, and the fiber meshes are compounded on two sides of the base cloth layer through a needling process, so that a sandwich structure is formed;
the normal-temperature blended three-proofing filter bag is prepared by the following steps:
firstly, laying a plurality of layers of fiber nets subjected to opening treatment on two sides of a base fabric, wherein the thickness of the fiber nets is 0.5-1.7mm, and then compounding the fiber nets on the base fabric through a needling process to obtain a filter bag fabric;
secondly, mixing a three-proofing finishing agent and water according to the weight ratio of 150 g: 1L of the mixture is uniformly mixed and then placed in a trough of a padding machine, and the weight ratio of the mixture to the bath is 1: 20, soaking the filter bag fabric by a padding machine, and performing two-soaking and two-rolling to obtain a three-proofing filter material, wherein the rolling residual rate is 30-40%, and the padding speed is 4-8 m/min;
and thirdly, pre-drying the three-proofing filter material at the temperature of 150-170 ℃ for 8-12min, then drying at the temperature of 180-200 ℃ for 4-6h, and then cutting and sewing to obtain the normal-temperature blended three-proofing filter bag.
Further, the three-proofing finishing agent is prepared by the following steps:
step S11, mixing hexafluorobutyl methacrylate, N-vinyl pyrrolidone, polyethylene glycol acrylate, butyl acrylate and hybrid particles, adding an emulsifier, and stirring at a rotation speed of 300-;
step S12, adding 1/4 pre-emulsion, 1/3 initiator solution and sodium bicarbonate into a reaction kettle, heating to 75 ℃ under the protection of nitrogen, stirring for reaction for 4 hours, then adding the rest pre-emulsion and initiator solution, heating to 85 ℃, stirring for reaction for 0.5 hour, then cooling to room temperature, and adjusting the pH value to 6-7 to obtain the three-proofing finishing agent.
Wherein the mass ratio of the hexafluorobutyl methacrylate, the N-vinyl pyrrolidone, the polyethylene glycol acrylate, the butyl acrylate and the hybrid particles is 60: 10-15: 10: 25: 5-8, wherein the emulsifier is prepared from hexadecyl trimethyl ammonium chloride and fatty alcohol-polyoxyethylene ether according to the mass ratio of 2: 3, the initiator solution is ammonium persulfate aqueous solution with the mass fraction of 10%, the dosage of the emulsifier is 4% of the total mass of the hexafluorobutyl methacrylate, the N-vinyl pyrrolidone, the polyethylene glycol acrylate, the butyl acrylate and the hybrid particles, and the dosage of the ammonium persulfate is 0.4% of the total mass of the hexafluorobutyl methacrylate, the N-vinyl pyrrolidone, the polyethylene glycol acrylate, the butyl acrylate and the hybrid particles.
The hybrid particles are made by the following steps:
step A1, adding hexachlorocyclotriphosphazene, 2-allyl-3-hydroxybenzaldehyde, potassium carbonate and tetrahydrofuran into a three-neck flask, heating to reflux for reaction for 48 hours, concentrating a reaction product to 1/4 of the original volume by using a rotary evaporator after the reaction is finished, pouring the concentrated reaction product into distilled water, standing for 4-6 hours, carrying out suction filtration, washing a filter cake for 3-5 times by using distilled water, and drying at 80 ℃ to constant weight to obtain a flame-retardant monomer;
wherein the dosage ratio of hexachlorocyclotriphosphazene, 2-allyl-3-hydroxybenzaldehyde, potassium carbonate and tetrahydrofuran is 5 g: 0.1 mol: 9.95 g: 200mL and 250mL, and obtaining a flame-retardant monomer by eliminating HCl reaction by using hexachlorocyclotriphosphazene and 2-allyl-3-hydroxybenzaldehyde;
step A2, oxidizing graphene and FeCl326H2O and ZnCl2Dispersing in ethylene glycol and performing ultrasonic treatment for 2h, then adding sodium acetate and polyethylene glycol-400, stirring for 30-40min, transferring to a polytetrafluoroethylene high-pressure reaction kettle, reacting for 10-12h at 200 ℃, after the reaction is finished, performing suction filtration on a reaction product, washing a filter cake once by using distilled water and absolute ethyl alcohol respectively, and finally drying in a 60 ℃ drying oven to constant weight to obtain a nano hybrid;
wherein, graphene oxide and FeCl326H2O、ZnCl2The dosage ratio of the ethylene glycol, the sodium acetate and the polyethylene glycol-400 is 30 mg: 2 mmol: 1 mmol: 150-180 mL: 16.2-16.5 g: 4.5g, taking graphene oxide with rich functional groups such as carboxyl groups on the surface as a growth site to adsorb zinc and iron metal ions through electrostatic action, wherein in the hydrothermal synthesis process, the iron and zinc metal ions form mesoporous zinc ferrite under the action of sodium acetate and uniformly modify the surface of the graphene oxide to obtain a nano hybrid;
step A3, adding a flame-retardant monomer and tetrahydrofuran into a flask, heating to 40 ℃, stirring for 20-30min, then adding KH-550 and glacial acetic acid, heating to 70 ℃, stirring for reaction for 1h, then adding an ethanol solution of a nano hybrid, cooling to 50 ℃, stirring for reaction for 30-50min, cooling to room temperature after the reaction is finished, centrifuging for 10min at a rotating speed of 9000r/min, removing the upper layer liquid, taking out the centrifuged product, washing for 3-5 times by using the ethanol solution with the mass fraction of 35%, and finally drying for 48h at 60 ℃ to obtain hybrid particles;
wherein the dosage ratio of the flame-retardant monomer, tetrahydrofuran, KH-550, glacial acetic acid and the ethanol solution of the nano hybrid is 0.05 mol: 180-220 mL: 0.05 mol: 1.84 mL: 60mL, the ethanol solution of the nano hybrid is prepared by mixing the nano hybrid and ethanol solution with the mass fraction of 50% according to the weight ratio of 18.5-20.3 g: 60mL of the mixture is obtained by ultrasonic mixing; firstly, the aldehyde group of the flame-retardant monomer and the amino group of HK-550 are subjected to condensation reaction, and then the silicon oxygen group of HK-550 and the hydroxyl group on the surface of the nano hybrid are subjected to grafting reaction to obtain the hybrid particle.
Removing HCl by using hexachlorocyclotriphosphazene and 2-allyl-3-hydroxybenzaldehyde to obtain a flame-retardant monomer, and oxidizing graphene and FeCl326H2O and ZnCl2Preparing a nano hybrid from raw materials, grafting a flame-retardant monomer on the surface of the nano hybrid by taking KH-550 as a bridge to obtain hybrid particles, wherein the hybrid particles not only have good dispersion characteristics, but also contain an unsaturated double bond structure and can participate in polymerization reaction, so that the hybrid particles are added into a three-proofing finishing agent, can exert temperature-resistant flame-retardant performance and have barrier and enhancement performance, on one hand, the unique two-dimensional layered structure of graphene oxide is utilized to enable the graphene oxide to form a compact continuous and uniform carbon layer in the combustion and decomposition process, thereby playing a more effective carbon layer barrier effect to delay the heat transfer and the transfer of combustible gas and oxygen in the combustion process, and simultaneously utilizing an oxygen-containing functional group on the surface of the graphene oxide as a mesoporous zinc ferrite growth site to improve the dispersibility of the zinc ferrite in a matrix and improve the agglomeration phenomenon of the graphene oxide in a pre-emulsion, on the other hand, the mesoporous zinc ferrite can catalyze the formation of a carbon layer, inhibit smoke, adsorb inflammable gas and prevent molten drops from dropping.
Further, the base cloth is a polyester needle felt, and the fiber net is made of PPS fibers, basalt fibers, polyester fibers and polytetrafluoroethylene fibers according to the mass ratio of 1: 3: 1: 1, the PPS fiber, the basalt fiber, the polyester fiber and the polytetrafluoroethylene fiber are all prepared according to a warp and weft yarn process, and the fineness of the PPS fiber, the basalt fiber, the polyester fiber and the polytetrafluoroethylene fiber is below 0.4 denier.
The invention has the beneficial effects that:
according to the invention, the three-proofing filter bag with a sandwich structure is obtained by compounding the base cloth layer and the fiber net layer; the three-proofing filter bag has high water repellency, oil repellency and antistatic performance, and also has excellent flame retardant performance and mechanical performance, and is mainly attributed to that the three-proofing finishing agent is obtained by polymerization reaction of hexafluorobutyl methacrylate, N-vinyl pyrrolidone, polyethylene glycol acrylate, butyl acrylate and hybrid particles, and has waterproof, oil-proof and antistatic performances, wherein the addition of the hybrid particles endows the three-proofing finishing agent with excellent flame retardant performance and barrier performance, and the N-vinyl pyrrolidone is polymerized in the three-proofing finishing agent to form a polypyrrole structure, and the polypyrrole structure and the hybrid particles cooperatively play an antistatic role.
Detailed Description
The technical solutions 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a three-proofing finishing agent, which is prepared by the following steps:
step S11, mixing 60g of hexafluorobutyl methacrylate, 10g of N-vinyl pyrrolidone, 10g of polyethylene glycol acrylate, 25g of butyl acrylate and 5g of hybrid particles, adding an emulsifier, and stirring at the rotating speed of 300r/min for 20min to obtain a pre-emulsion;
step S12, adding 1/4 pre-emulsion, 1/3 initiator solution and sodium bicarbonate into a reaction kettle, heating to 75 ℃ under the protection of nitrogen, stirring for reaction for 4 hours, adding the rest pre-emulsion and initiator solution, heating to 85 ℃, stirring for reaction for 0.5 hour, cooling to room temperature, adjusting the pH value to 6 to obtain a three-proofing finishing agent, wherein the emulsifier is composed of hexadecyltrimethylammonium chloride and fatty alcohol-polyoxyethylene ether according to the mass ratio of 2: 3, the initiator solution is ammonium persulfate aqueous solution with the mass fraction of 10%, the dosage of the emulsifier is 4% of the total mass of the hexafluorobutyl methacrylate, the N-vinyl pyrrolidone, the polyethylene glycol acrylate, the butyl acrylate and the hybrid particles, and the dosage of the ammonium persulfate is 1/10% of the mass of the initiator.
The hybrid particles are made by the following steps:
step A1, adding 5g of hexachlorocyclotriphosphazene, 0.1mol of 2-allyl-3-hydroxybenzaldehyde, 9.95g of potassium carbonate and 200mL of tetrahydrofuran into a three-neck flask, heating to reflux for reaction for 48 hours, concentrating a reaction product to 1/4 of the original volume by using a rotary evaporator after the reaction is finished, then pouring into distilled water, standing for 4 hours, carrying out suction filtration, washing a filter cake for 3 times by using distilled water, and drying at 80 ℃ to constant weight to obtain a flame-retardant monomer;
step A2, mixing 30mg of graphene oxide and 2mmol of FeCl326H2O and 1mmol ZnCl2Dispersing into 150mL of ethylene glycol, performing ultrasonic treatment for 2 hours, adding 16.2g of sodium acetate and 4.5g of polyethylene glycol-400, stirring for 30 minutes, transferring into a polytetrafluoroethylene high-pressure reaction kettle, reacting for 10 hours at 200 ℃, after the reaction is finished, performing suction filtration on a reaction product, washing a filter cake once by using distilled water and absolute ethyl alcohol respectively, and finally placing in a 60 ℃ drying oven to dry to constant weight to obtain a nano hybrid;
step A3, adding 0.05mol of flame-retardant monomer and 180mL of tetrahydrofuran into a flask, heating to 40 ℃, stirring for 20min, then adding 0.05mol of KH-550 and 1.84mL of glacial acetic acid, heating to 70 ℃, stirring for reaction for 1h, then adding 60mL of ethanol solution of nano hybrid, cooling to 50 ℃, stirring for reaction for 30min, after the reaction is finished, cooling to room temperature, centrifuging at the rotation speed of 9000r/min for 10min, removing the upper layer liquid, taking out the centrifuged product, washing with ethanol solution with the mass fraction of 35% for 3 times, and finally drying at 60 ℃ for 48h to obtain hybrid particles, wherein the ethanol solution of the nano hybrid is prepared from the nano hybrid and ethanol solution with the mass fraction of 50% according to the weight ratio of 18.5 g: 60mL of the mixture is obtained by ultrasonic mixing.
Example 2
The embodiment provides a three-proofing finishing agent, which is prepared by the following steps:
step S11, mixing 60g of hexafluorobutyl methacrylate, 12g of N-vinyl pyrrolidone, 10g of polyethylene glycol acrylate, 25g of butyl acrylate and 7g of hybrid particles, adding an emulsifier, and stirring at the rotation speed of 400r/min for 25min to obtain a pre-emulsion;
step S12, adding 1/4 pre-emulsion, 1/3 initiator solution and sodium bicarbonate into a reaction kettle, heating to 75 ℃ under the protection of nitrogen, stirring for reaction for 4 hours, adding the rest pre-emulsion and initiator solution, heating to 85 ℃, stirring for reaction for 0.5 hour, cooling to room temperature, adjusting the pH value to 6 to obtain a three-proofing finishing agent, wherein the emulsifier is composed of hexadecyltrimethylammonium chloride and fatty alcohol-polyoxyethylene ether according to the mass ratio of 2: 3, the initiator solution is ammonium persulfate aqueous solution with the mass fraction of 10%, the dosage of the emulsifier is 4% of the total mass of the hexafluorobutyl methacrylate, the N-vinyl pyrrolidone, the polyethylene glycol acrylate, the butyl acrylate and the hybrid particles, and the dosage of the ammonium persulfate is 1/10% of the mass of the initiator.
The hybrid particles are made by the following steps:
step A1, adding 5g of hexachlorocyclotriphosphazene, 0.1mol of 2-allyl-3-hydroxybenzaldehyde, 9.95g of potassium carbonate and 220mL of tetrahydrofuran into a three-neck flask, heating to reflux for reaction for 48 hours, concentrating a reaction product to 1/4 of the original volume by using a rotary evaporator after the reaction is finished, then pouring into distilled water, standing for 5 hours, carrying out suction filtration, washing a filter cake for 4 times by using distilled water, and drying at 80 ℃ to constant weight to obtain a flame-retardant monomer;
step A2, mixing 30mg of graphene oxide and 2mmol of FeCl326H2O and 1mmol ZnCl2Dispersing into 170mL of ethylene glycol, performing ultrasonic treatment for 2 hours, adding 16.4g of sodium acetate and 4.5g of polyethylene glycol-400, stirring for 35min, transferring into a polytetrafluoroethylene high-pressure reaction kettle, reacting for 11 hours at 200 ℃, after the reaction is finished, performing suction filtration on a reaction product, washing a filter cake once by using distilled water and absolute ethyl alcohol respectively, and finally placing in a 60 ℃ drying oven to dry to constant weight to obtain a nano hybrid;
step A3, adding 0.05mol of flame-retardant monomer and 190mL of tetrahydrofuran into a flask, heating to 40 ℃, stirring for 25min, then adding 0.05mol of KH-550 and 1.84mL of glacial acetic acid, heating to 70 ℃, stirring for reaction for 1h, then adding 60mL of ethanol solution of nano hybrid, cooling to 50 ℃, stirring for reaction for 40min, after the reaction is finished, cooling to room temperature, centrifuging at the rotation speed of 9000r/min for 10min, removing the upper layer liquid, taking out the centrifuged product, washing with ethanol solution with the mass fraction of 35% for 4 times, and finally drying at 60 ℃ for 48h to obtain hybrid particles, wherein the ethanol solution of the nano hybrid is prepared from the nano hybrid and ethanol solution with the mass fraction of 50% according to the weight ratio of 19.5 g: 60mL of the mixture is obtained by ultrasonic mixing.
Example 3
The embodiment provides a three-proofing finishing agent, which is prepared by the following steps:
step S11, mixing 60g of hexafluorobutyl methacrylate, 15g of N-vinyl pyrrolidone, 10g of polyethylene glycol acrylate, 25g of butyl acrylate and 8g of hybrid particles, adding an emulsifier, and stirring for 30min at the rotation speed of 500r/min to obtain a pre-emulsion;
step S12, adding 1/4 pre-emulsion, 1/3 initiator solution and sodium bicarbonate into a reaction kettle, heating to 75 ℃ under the protection of nitrogen, stirring for reaction for 4 hours, adding the rest pre-emulsion and initiator solution, heating to 85 ℃, stirring for reaction for 0.5 hour, cooling to room temperature, adjusting the pH value to 7 to obtain a three-proofing finishing agent, wherein the emulsifier is composed of hexadecyltrimethylammonium chloride and fatty alcohol-polyoxyethylene ether according to the mass ratio of 2: 3, the initiator solution is ammonium persulfate aqueous solution with the mass fraction of 10%, the dosage of the emulsifier is 4% of the total mass of the hexafluorobutyl methacrylate, the N-vinyl pyrrolidone, the polyethylene glycol acrylate, the butyl acrylate and the hybrid particles, and the dosage of the ammonium persulfate is 1/10% of the mass of the initiator.
The hybrid particles are made by the following steps:
step A1, adding 5g of hexachlorocyclotriphosphazene, 0.1mol of 2-allyl-3-hydroxybenzaldehyde, 9.95g of potassium carbonate and 250mL of tetrahydrofuran into a three-neck flask, heating to reflux for reaction for 48 hours, concentrating a reaction product to 1/4 of the original volume by using a rotary evaporator after the reaction is finished, then pouring into distilled water, standing for 6 hours, carrying out suction filtration, washing a filter cake for 5 times by using distilled water, and drying at 80 ℃ to constant weight to obtain a flame-retardant monomer;
step A2, mixing 30mg of graphene oxide and 2mmol of FeCl326H2O and 1mmol ZnCl2Dispersing into 180mL of ethylene glycol, performing ultrasonic treatment for 2 hours, adding 16.5g of sodium acetate and 4.5g of polyethylene glycol-400, stirring for 40min, transferring into a polytetrafluoroethylene high-pressure reaction kettle, reacting for 12 hours at 200 ℃, after the reaction is finished, performing suction filtration on a reaction product, washing a filter cake once by using distilled water and absolute ethyl alcohol respectively, and finally placing in a 60 ℃ drying oven to dry to constant weight to obtain a nano hybrid;
step A3, adding 0.05mol of flame-retardant monomer and 220mL of tetrahydrofuran into a flask, heating to 40 ℃, stirring for 30min, then adding 0.05mol of KH-550 and 1.84mL of glacial acetic acid, heating to 70 ℃, stirring for reaction for 1h, then adding 60mL of ethanol solution of nano hybrid, cooling to 50 ℃, stirring for reaction for 50min, after the reaction is finished, cooling to room temperature, centrifuging at the rotation speed of 9000r/min for 10min, removing the upper layer liquid, taking out the centrifuged product, washing with ethanol solution with the mass fraction of 35% for 5 times, and finally drying at 60 ℃ for 48h to obtain hybrid particles, wherein the ethanol solution of the nano hybrid is prepared from the nano hybrid and the ethanol solution with the mass fraction of 50% according to the weight ratio of 20.3 g: 60mL of the mixture is obtained by ultrasonic mixing.
Comparative example 1
The hybrid particles in example 1 were removed, and the remaining raw materials and preparation process were unchanged.
Comparative example 2
The nano hybrid in example 2 was replaced with graphene oxide, and the remaining raw materials and preparation process were unchanged.
Example 4
A normal temperature blending three-proofing filter bag comprises a base cloth layer and fiber mesh layers, wherein the fiber mesh layers are respectively arranged on two sides of the base cloth layer, and the fiber meshes are compounded on two sides of the base cloth layer through a needling process, so that a sandwich structure is formed;
the normal-temperature blended three-proofing filter bag is prepared by the following steps:
firstly, laying multiple layers of fiber nets subjected to opening treatment on two sides of base cloth, wherein the thickness of the fiber nets is 0.5mm, and then compounding the fiber nets on the base cloth through a needling process to obtain a filter bag fabric;
step two, mixing the three-proofing finishing agent of the embodiment 1 and water according to the weight ratio of 150 g: 1L of the mixture is uniformly mixed and then placed in a trough of a padding machine, and the weight ratio of the mixture to the bath is 1: 20, soaking the filter bag fabric by a padding machine, soaking twice and rolling twice to obtain a three-proofing filter material, wherein the rolling residual rate is 30 percent, and the padding speed is 4 m/min;
and thirdly, pre-drying the three-proofing filter material at 170 ℃ for 12min, then drying at 180 ℃ for 6h, and then cutting and sewing to obtain the normal-temperature blended three-proofing filter bag.
The base cloth is a polyester needle felt, and the fiber net is made of PPS fibers, basalt fibers, polyester fibers and polytetrafluoroethylene fibers according to a mass ratio of 1: 3: 1: 1, the PPS fiber, the basalt fiber, the polyester fiber and the polytetrafluoroethylene fiber are all prepared according to a warp and weft yarn process, and the fineness of the PPS fiber, the basalt fiber, the polyester fiber and the polytetrafluoroethylene fiber is below 0.4 denier.
Example 5
A normal temperature blending three-proofing filter bag comprises a base cloth layer and fiber mesh layers, wherein the fiber mesh layers are respectively arranged on two sides of the base cloth layer, and the fiber meshes are compounded on two sides of the base cloth layer through a needling process, so that a sandwich structure is formed;
the normal-temperature blended three-proofing filter bag is prepared by the following steps:
firstly, laying multiple layers of fiber nets subjected to opening treatment on two sides of base cloth, wherein the thickness of the fiber nets is 1.1mm, and then compounding the fiber nets on the base cloth through a needling process to obtain a filter bag fabric;
secondly, mixing the three-proofing finishing agent of the embodiment 2 and water according to the weight ratio of 150 g: 1L of the mixture is uniformly mixed and then placed in a trough of a padding machine, and the weight ratio of the mixture to the bath is 1: 20, soaking the filter bag fabric by a padding machine, soaking twice and rolling twice to obtain a three-proofing filter material, wherein the rolling residual rate is 35 percent, and the padding speed is 6 m/min;
and thirdly, pre-drying the three-proofing filter material at 160 ℃ for 10min, then drying at 190 ℃ for 5h, and then cutting and sewing to obtain the normal-temperature blended three-proofing filter bag.
The base cloth is a polyester needle felt, and the fiber net is made of PPS fibers, basalt fibers, polyester fibers and polytetrafluoroethylene fibers according to a mass ratio of 1: 3: 1: 1, the PPS fiber, the basalt fiber, the polyester fiber and the polytetrafluoroethylene fiber are all prepared according to a warp and weft yarn process, and the fineness of the PPS fiber, the basalt fiber, the polyester fiber and the polytetrafluoroethylene fiber is below 0.4 denier.
Example 6
A normal temperature blending three-proofing filter bag comprises a base cloth layer and fiber mesh layers, wherein the fiber mesh layers are respectively arranged on two sides of the base cloth layer, and the fiber meshes are compounded on two sides of the base cloth layer through a needling process, so that a sandwich structure is formed;
the normal-temperature blended three-proofing filter bag is prepared by the following steps:
firstly, laying multiple layers of fiber nets subjected to opening treatment on two sides of base cloth, wherein the thickness of the fiber nets is 1.7mm, and then compounding the fiber nets on the base cloth through a needling process to obtain a filter bag fabric;
step two, mixing the three-proofing finishing agent of the embodiment 3 and water according to the weight ratio of 150 g: 1L of the mixture is uniformly mixed and then placed in a trough of a padding machine, and the weight ratio of the mixture to the bath is 1: 20, soaking the filter bag fabric by a padding machine, and performing two-soaking and two-rolling to obtain a three-proofing filter material, wherein the rolling residual rate is 40%, and the padding speed is 8 m/min;
and thirdly, pre-drying the three-proofing filter material at 150 ℃ for 8min, then drying at 200 ℃ for 4h, and then cutting and sewing to obtain the normal-temperature blended three-proofing filter bag.
The base cloth is a polyester needle felt, and the fiber net is formed by PPS fibers, basalt fibers, polyester fibers and polytetrafluoroethylene fibers according to the mass ratio of 1: 3: 1: 1, the PPS fiber, the basalt fiber, the polyester fiber and the polytetrafluoroethylene fiber are all prepared according to a warp and weft yarn process, and the fineness of the PPS fiber, the basalt fiber, the polyester fiber and the polytetrafluoroethylene fiber is below 0.4 denier.
Comparative example 3
The three-proofing finishing agent in the embodiment 4 is replaced by the three-proofing finishing agent in the proportion 1, and the rest raw materials and the preparation process are unchanged.
Comparative example 4
The three-proofing finishing agent in the embodiment 5 is replaced by the three-proofing finishing agent in the proportion 2, and the rest raw materials and the preparation process are unchanged.
Comparative example 5
The three-proofing finishing agent in the embodiment 6 is replaced by the three-proofing finishing agent sold by Shanghai hong Help industries, and other raw materials and the preparation process are not changed.
The three-proofing filter bags prepared in examples 4-6 and comparative examples 3-5 were tested according to the following test procedures:
water repellency: the water repellency is tested according to AAT CC 22-2005 'spraying method for testing water repellency of textiles'. Taking a sample to be tested, clamping the sample to be tested to a flat and tight state by using a clamp, enabling the warp direction of the fabric to follow the direction of water drops flowing down from the cloth cover, then placing the fabric to be tested on a 45-degree inclined plane, enabling the center of the sample to be tested to be 150mm below the center of the surface of a nozzle, and spraying the sample to be tested on the surface of the sample within 25-30s by using a spray head. After the showering is finished, the tested samples are compared with the standard and graded into 5 grades, wherein the grade 1 is the worst grade, and the grade 5 is the best grade.
Oil repellency: according to AATCC 118-2007 oil drainage: the oil repellency was tested according to Hydrocarbon test Standard. The test was left for at least 4h under standard conditions. Two 20cm320cm samples were taken at a distance from the selvedge and cloth ends and the samples were flat and without creases. At 5 locations 4cm from each other on the sample, droplets with a droplet diameter of 5mm or a volume of 5mL were observed at an angle of about 45 ° for an oil droplet shape of 30 s. The rating was done according to the AATCC118 rating method, with grade 1 being the worst and grade 8 being the best.
Air permeability: the test was carried out using an FX3300 III Fabric Permeability tester according to DIN EN ISO 9237-1995, determination of Permeability of textile fabrics, test area 20cm2And testing the airflow flow which vertically passes through a given area of the sample within a certain time by using the pressure difference of 200Pa, sampling different parts of the same fabric for 10 times of tests, and taking an average value.
Combustion performance: according to GB 8410-2006 Combustion characteristic of automotive interior materials, the horizontal flame retardant performance test is carried out, the sample is adjusted for at least 24 hours but not more than 168 hours under the standard state of temperature (23 +/-2) DEG C and relative humidity of 45% -55%, and 5 cloth samples are taken in the longitudinal direction and the latitudinal direction during the test, and the average value is taken. If the sample is exposed in the flame for 15s, the sample which extinguishes the fire source is not burnt, or the sample can burn, but the flame is extinguished before reaching the first measuring marking line, and no burning distance can be measured, all the samples are marked as A-0 mm/min. If the experimental timing is started, the flame self-extinguishes within 60s, and the burning distance is not more than 50mm, the flame is considered to meet the burning speed requirement, and the result is marked as B.
Breaking strength: on a universal stretching instrument, according to GB/T3923.1-2013 part 1 of the stretching performance of textile fabrics: the breaking strength before and after finishing of the fabric is tested according to the standards of breaking strength and breaking elongation (strip sample method), 5 samples of each sample need to be taken in the warp direction and the weft direction respectively for testing, and an average value is taken.
The test results are shown in table 1:
TABLE 1
Figure BDA0003497639530000121
Figure BDA0003497639530000131
As can be seen from Table 1, the filter bags prepared in examples 4 to 6 have high water and oil repellency, and good flame retardant properties and mechanical properties.
Antistatic performance: the test method refers to a specific test method of GB/T24249-2009 anti-static clean fabric, the surface resistivity and the frictional electrification voltage of the fabric are calculated, at least 5 test samples are obtained, and the test average value is taken.
Acid resistance: placing the three-proofing filter bags prepared in the examples 4-6 and the comparative examples 3-5 in a hydrochloric acid solution with the mass fraction of 5%, soaking at 60 ℃ for 48h, and observing whether bubbles, falling off and other phenomena exist;
alkali resistance: placing the three-proofing filter bags prepared in the examples 4-6 and the comparative examples 3-5 in a sodium hydroxide solution with the mass fraction of 5%, soaking at 60 ℃ for 48h, and observing whether bubbles, falling off and other phenomena exist;
the test results are shown in table 2:
TABLE 2
Figure BDA0003497639530000132
As can be seen from Table 2, the filter bags prepared in examples 4 to 6 had better antistatic properties and corrosion resistance.
In conclusion, the three-proofing filter bag prepared by the method disclosed by the invention has high water repellency, oil repellency and antistatic performance, and also has high flame retardance and mechanical properties.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.

Claims (8)

1. A preparation method of a normal-temperature blended three-proofing filter bag is characterized by comprising the following steps:
firstly, laying fiber nets subjected to opening treatment on two sides of base cloth, and compounding the fiber nets on the base cloth by using a needling process to obtain filter bag fabrics;
secondly, mixing hexafluorobutyl methacrylate, N-vinyl pyrrolidone, polyethylene glycol acrylate, butyl acrylate and hybrid particles, adding an emulsifier, and stirring to obtain a pre-emulsion;
mixing 1/4 pre-emulsion, 1/3 initiator solution and sodium bicarbonate, heating to 75 ℃ under the protection of nitrogen, stirring for reaction for 4 hours, adding the rest pre-emulsion and initiator solution, heating to 85 ℃, stirring for reaction for 0.5 hour, cooling to room temperature, and adjusting the pH value to 6-7 to obtain a three-proofing finishing agent;
and step four, mixing the three-proofing finishing agent with water to soak the filter bag fabric, soaking for two times and rolling for two times, pre-drying for 8-12min at the temperature of 150-plus-materials and 170 ℃, then drying for 4-6h at the temperature of 180-plus-materials and 200 ℃, and cutting and sewing to obtain the normal-temperature blended three-proofing filter bag.
2. The preparation method of the normal-temperature blended three-proofing filter bag according to claim 1, wherein the emulsifier is prepared from hexadecyltrimethylammonium chloride and fatty alcohol-polyoxyethylene ether according to a mass ratio of 2: 3, and the initiator solution is 10 percent of ammonium persulfate aqueous solution by mass fraction.
3. The preparation method of the normal-temperature blended three-proofing filter bag according to claim 2, wherein the amount of the emulsifier is 4% of the total mass of the hexafluorobutyl methacrylate, the N-vinyl pyrrolidone, the polyethylene glycol acrylate, the butyl acrylate and the hybrid particles, and the amount of the ammonium persulfate is 0.4% of the total mass of the hexafluorobutyl methacrylate, the N-vinyl pyrrolidone, the polyethylene glycol acrylate, the butyl acrylate and the hybrid particles.
4. The preparation method of the normal-temperature blended three-proofing filter bag according to claim 1, wherein the hybrid particles are prepared by the following steps:
adding a flame-retardant monomer and tetrahydrofuran into a flask, heating to 40 ℃, stirring for 20-30min, adding KH-550 and glacial acetic acid, heating to 70 ℃, stirring for reaction for 1h, adding an ethanol solution of a nano hybrid, cooling to 50 ℃, stirring for reaction for 30-50min, centrifuging, washing, and drying to obtain the hybrid particles.
5. The preparation method of the normal-temperature blended three-proofing filter bag according to claim 4, wherein the ethanol solution of the nano hybrid is prepared by mixing the nano hybrid with an ethanol solution with a mass fraction of 50% according to a ratio of 18.5-20.3 g: 60mL of the mixture is obtained by ultrasonic mixing.
6. The preparation method of the normal-temperature blended three-proofing filter bag according to claim 4, wherein the flame-retardant monomer is prepared by the following steps:
mixing hexachlorocyclotriphosphazene, 2-allyl-3-hydroxybenzaldehyde, potassium carbonate and tetrahydrofuran, carrying out reflux reaction for 48 hours, concentrating to 1/4 of the original volume, then pouring into distilled water, standing for 4-6 hours, carrying out suction filtration, washing a filter cake, and drying to obtain the flame-retardant monomer.
7. The preparation method of the normal-temperature blended three-proofing filter bag according to claim 4, wherein the nano hybrid is prepared by the following steps:
oxidized graphene and FeCl3·6H2O and ZnCl2Dispersing into ethylene glycol, performing ultrasonic treatment for 2h, adding sodium acetate and polyethylene glycol-400, stirring, transferring into a reaction kettle, reacting at 200 deg.C for 10-12h, filtering, washing filter cake, and drying to obtain nanometer hybrid.
8. A normal-temperature blended three-proofing filter bag, which is characterized by being prepared by the preparation method of any one of claims 1 to 7.
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