CN113101757A - Combined type air filter assembly - Google Patents
Combined type air filter assembly Download PDFInfo
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- CN113101757A CN113101757A CN202110343493.9A CN202110343493A CN113101757A CN 113101757 A CN113101757 A CN 113101757A CN 202110343493 A CN202110343493 A CN 202110343493A CN 113101757 A CN113101757 A CN 113101757A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0028—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions provided with antibacterial or antifungal means
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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
- B01D39/14—Other self-supporting filtering material ; Other filtering material
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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
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- 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
- D06M11/77—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 silicon or compounds thereof
- D06M11/79—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 silicon or compounds thereof with silicon dioxide, silicic acids or their salts
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- 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
- D06M14/00—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials
- D06M14/18—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation
- D06M14/26—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of synthetic origin
- D06M14/28—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of synthetic origin of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- 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
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/643—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon in the main chain
- D06M15/657—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon in the main chain containing fluorine
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- 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
- D06M16/00—Biochemical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. enzymatic
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- 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
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0442—Antimicrobial, antibacterial, antifungal additives
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- 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
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
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- 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
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- 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
- D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/20—Polyalkenes, polymers or copolymers of compounds with alkenyl groups bonded to aromatic groups
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- 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
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- 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
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Abstract
The invention discloses a combined type air filter assembly, which relates to the technical field of filters and comprises an outer shell and an air filter element arranged in the outer shell, wherein the air filter element is prepared by filter paper compounded by a filter layer and an antibacterial layer, the filter layer has good self-cleaning performance, so that dust is not easy to accumulate on the surface of a fabric, the advantages of no water absorption, no dust accumulation, long-acting filtration and long service life are achieved, the air filter has good air purification effect, frequent replacement of the filter element is avoided, and the air purification cost is reduced; the antibacterial layer has good antibacterial performance, and carries out antibacterial sterilization to the air for impurity in the air through antibacterial layer is got rid of basically, has further given this air cleaner good air purification effect, avoids the human body to inhale the bacterium and be sick, and the security performance is high, has solved current air cleaner and has easily inhaled water, easy deposition, and the automatically cleaning effect is poor, and life is short, the poor problem of antibacterial effect moreover.
Description
Technical Field
The invention relates to the technical field of filters, in particular to a combined type air filter assembly.
Background
In one system, a porous media is used to remove solid particles from a gas, called filtration, and the accessory used to accomplish such a mission is called an air cleaner;
in recent years, air purification devices are widely used due to high concentration of particulate pollutants in air caused by environmental pollution, and air filters are used as key components of the air purification devices and used for filtering and purifying particulate matters with different sizes in the air;
at present, most air purification filter core materials are prepared by micron fibers, and in the years, a large amount of fine particles are accumulated and attached to the surface of a filter fiber material, so that the ventilation efficiency is reduced, the filter fiber material is blocked seriously and even subjected to secondary pollution, the filter fiber material is easy to corrode and damage after contacting too much humid air, bacteria are easy to breed, the air quality is influenced, and the good air purification effect cannot be achieved.
Therefore, how to improve the problems that the existing air filter is easy to absorb water and deposit dust, has poor self-cleaning effect and short service life, and has poor antibacterial effect is the problem to be solved by the invention.
Disclosure of Invention
In order to overcome the above technical problems, the present invention provides a composite air filter assembly: prepare the air cleaner assembly of a combined type through by the shell body and installing at the inside air filter of shell body, air filter is by the filter layer, the compound filter paper that forms of antibiotic layer is prepared and is formed, the filter layer is the skin, contact earlier with the air, can fully filter the impurity in the air, antibiotic layer is the inlayer, air contact after filtering with the filter layer, carry out antibacterial treatment with it, through with the filter layer, antibiotic layer complex forms, make this air filter have good filter effect and antibiotic effect, make the result of use of this combined type air cleaner assembly good, current air cleaner has been solved and has easily been inhaled water, easy deposition, the automatically cleaning effect is poor, short service life, and the poor problem of antibiotic effect.
The purpose of the invention can be realized by the following technical scheme:
a combined type air filter assembly comprises an outer shell and an air filter element arranged inside the outer shell, wherein an air outlet pipe is arranged at the top of the outer shell, an air inlet pipe is arranged on one side of the top of the outer shell, the air inlet pipe is communicated to an inner cavity of the outer shell, the bottom end of the air outlet pipe is positioned in the inner cavity of the air filter element, filter paper is arranged on the peripheral surface of the air filter element, and the filter paper is formed by compounding a filter layer and an antibacterial layer;
the filter layer is prepared by the following steps:
the method comprises the following steps: stirring tetramethoxysilane, methyltrimethoxysilane and methanol for 20-40min under the condition that the stirring speed is 100-200r/min to obtain a mixed solution, then dropwise adding oxalic acid into the mixed solution, controlling the dropwise adding time to be 10-20min, continuously stirring for 20-30h under the conditions that the temperature is 20-30 ℃ and the stirring speed is 50-100r/min, then dropwise adding ammonia water and continuously stirring for 20-30min to obtain sol;
step two: placing the sol in a vacuum drying oven, drying at the temperature of 35-45 ℃ until gel is completely formed, and carrying out aging treatment on the gel at the temperature of 50-60 ℃ for 40-50h to obtain a product A;
step three: adding the product A into methanol, then carrying out ultrasonic dispersion for 2-3H under the condition that the ultrasonic frequency is 40-60KHz to obtain gel dispersion liquid, adding concentrated hydrochloric acid into the gel dispersion liquid under the condition that the stirring speed is 100-200r/min, continuing to stir for 30-50min, then adding 1H,1H,2H, 2H-perfluorooctyltrimethoxysilane, and continuing to stir for 15-20H under the conditions that the temperature is 20-30 ℃ and the stirring speed is 300-500r/min to obtain a surface modifier;
step four: soaking the PP non-woven fabric into a surface modifier for 1-2h, taking out, air-drying at room temperature, standing at room temperature for 24h in an ammonia atmosphere, and finally drying in an oven to obtain a filter layer;
as a further scheme of the invention: the reaction principle of the filter layer is as follows:
through preparing a silica gel, treating the silica gel on PP non-woven fabric after 1H,1H,2H, 2H-perfluorooctyl trimethoxy silane is fluorinated, forming a polymer after 1H,1H,2H, 2H-perfluorooctyl trimethoxy silane is hydrolyzed and condensed, the polymer is combined with silica gel particles to form a composite film, and then the composite film is uniformly covered on the surface of the fiber, so that the surface free energy of the PP non-woven fabric is greatly reduced, the hydrophobic and oleophobic characteristics are presented, the liquid drops are easy to roll on the surface of the fabric after contacting with water, the fabric has good self-cleaning performance, dust is not easy to accumulate on the surface of the fabric, the advantages of no water absorption, no dust accumulation, long-acting filtration and long service life are achieved, the air filter is endowed with good air purification effect, frequent filter element replacement is avoided, and the air purification cost is reduced;
as a further scheme of the invention: in the first step, the volume ratio of tetramethoxysilane, methyltrimethoxysilane, methanol, oxalic acid and ammonia water is 7:3:60:5:5, the mass concentration of the oxalic acid substance is 0.1mol/L, and the mass concentration of the ammonia water substance is 10 mol/L.
As a further scheme of the invention: in the second step, the dosage ratio of the product A, methanol, concentrated hydrochloric acid, 1H,2H, 2H-perfluorooctyltrimethoxysilane is 1 g: 11mL of: 150 μ L of: 0.15g, and the mass fraction of the concentrated hydrochloric acid is 37%.
As a further scheme of the invention: the preparation process of the antibacterial layer is as follows:
s1: adding 4-aminopyridine into chloroform, and uniformly dispersing at a stirring speed of 100-;
s2: cooling to 0-5 ℃ in an ice water bath, adding 2-butenoic acid acyl chloride into chloroform, and uniformly dispersing under the condition that the stirring speed is 100-200r/min to obtain a 2-butenoic acid acyl chloride solution;
s3: dropwise adding the 2-butenoic acid acyl chloride solution into the 4-aminopyridine solution under stirring, controlling the dropwise adding time to be 30-50min, continuously stirring and reacting for 1-2h under the conditions that the temperature is 0-5 ℃ and the stirring speed is 100-200r/min, after the reaction is finished, carrying out vacuum filtration, washing a filter cake for 3-5 times by using acetone, then placing the filter cake into a vacuum drying box, and drying the filter cake to constant weight under the condition that the temperature is 50-60 ℃ to obtain an intermediate 1;
the reaction principle is as follows:
s4: dissolving the intermediate 1 in N, N-dimethylformamide, adding 1-dodecyl bromide, reacting for 4-5h at 90-100 ℃, then carrying out vacuum reduced pressure distillation to remove the N, N-dimethylformamide, recrystallizing a distillation product in an ether-ethanol mixed solvent, filtering, placing a filter cake in a vacuum drying oven, and drying for 24-30h at 50-60 ℃ to obtain an intermediate 2;
the reaction principle is as follows:
s5: adding benzophenone into absolute ethyl alcohol, stirring at the stirring speed of 300-500r/min until benzophenone is completely dissolved, then adding an intermediate 2, continuously stirring for 20-40min to obtain a grafting solution, soaking a PP non-woven fabric in an acetone solution for 2-4h, taking out, cleaning with deionized water for 3-5 times, then placing the PP non-woven fabric in a vacuum drying box, drying at the temperature of 35-45 ℃ to constant weight, then placing the dried PP non-woven fabric in the grafting solution for soaking for 30-50min, taking out, draining the liquid, placing on an ultraviolet irradiation table, irradiating with an ultraviolet light source for 0.5-1h, turning over once in the middle, washing the irradiated PP non-woven fabric with deionized water for 3-5 times, then placing in an ethanol solution, ultrasonically washing for 10-20min, then washing with deionized water for 3-5 times, finally placing in a vacuum drying oven, and drying at 35-45 deg.C to constant weight to obtain antibacterial layer.
The reaction principle is as follows:
benzophenone is used as a photoinitiator, active sites are generated under the condition of ultraviolet illumination to obtain an intermediate 3, the active sites on the intermediate 3 are transferred to PP fibers to obtain an intermediate 4, and the intermediate 2 is grafted to the intermediate 4 through the active sites;
as a further scheme of the invention: the reaction principle of the antibacterial layer is as follows:
4-aminopyridine and 2-butenoic acid acyl chloride react to generate an intermediate 1, the intermediate 1 reacts with 1-dodecyl bromine to generate an intermediate 2, the intermediate 2 is quaternary ammonium salt, the quaternary ammonium salt changes tissues by utilizing the surface adsorption effect to cause the damage of bacterial cell membranes, the intermediate 2 is grafted to a molecular chain of the PP non-woven fabric by taking benzophenone as a photoinitiator, so that the PP non-woven fabric is endowed with good antibacterial performance, the filtered air is further subjected to antibacterial sterilization, impurities in the air passing through the antibacterial layer are basically removed, the air filter is further endowed with good air purification effect, the human body is prevented from being sick due to the fact that the human body inhales bacteria, and the safety performance is high.
As a further scheme of the invention: the dosage ratio of the 4-aminopyridine to the chloroform in the step S1 is 0.05 mol: 50 mL.
As a further scheme of the invention: in the step S2, the dosage ratio of the 2-butenoic acid acyl chloride to the chloroform is 0.05 mol: 50 mL.
As a further scheme of the invention: the volume ratio of the 2-butenoyl chloride solution to the 4-aminopyridine solution in the step S3 is 5: 6.
As a further scheme of the invention: in the step S4, the dosage ratio of the intermediate 1, the N, N-dimethylformamide and the 1-dodecyl bromide is 0.05 mol: 100mL of: 0.04mol, wherein the diethyl ether-ethanol mixed solvent is a mixture of diethyl ether and ethanol according to a ratio of 1: 1.
As a further scheme of the invention: in the step S5, the dosage ratio of the benzophenone, the absolute ethyl alcohol and the intermediate 2 is 1 g: 12mL of: 10 g.
The invention has the beneficial effects that:
the air filter assembly comprises an outer shell and an air filter element arranged inside the outer shell, wherein an air outlet pipe is arranged at the top of the outer shell, an air inlet pipe is arranged on one side of the top of the outer shell and communicated into an inner cavity of the outer shell, the bottom end of the air outlet pipe is positioned in the inner cavity of the air filter element, filter paper is arranged on the circumferential surface of the air filter element and is formed by compounding a filter layer and an antibacterial layer, the filter layer is an outer layer and is in contact with air firstly, impurities in the air can be fully filtered, the antibacterial layer is an inner layer and is in contact with the air filtered by the filter layer, antibacterial treatment is carried out on the air, and the air filter element is formed by compounding the filter layer and the antibacterial layer, so that the air filter element has good;
the preparation method of the air filter assembly also comprises the steps of uniformly stirring tetramethoxysilane, methyltrimethoxysilane and methanol to obtain a mixed solution, dropwise adding oxalic acid into the mixed solution, continuously stirring, dropwise adding ammonia water, continuously stirring to obtain a sol, placing the sol in a vacuum drying oven, drying until the sol completely forms gel, aging the gel to obtain a product A, adding the product A into the methanol, ultrasonically dispersing to obtain a gel dispersion liquid, adding concentrated hydrochloric acid into the gel dispersion liquid, continuously stirring, adding 1H,1H,2H, 2H-perfluorooctyl trimethoxysilane, continuously stirring to obtain a surface modifier, soaking the PP non-woven fabric into the surface modifier, taking out, air-drying at room temperature, placing in an ammonia atmosphere, standing at room temperature, finally, drying the mixture in a drying oven to obtain a filter layer; through preparing a silica gel, treating the silica gel on PP non-woven fabric after 1H,1H,2H, 2H-perfluorooctyl trimethoxy silane is fluorinated, forming a polymer after 1H,1H,2H, 2H-perfluorooctyl trimethoxy silane is hydrolyzed and condensed, the polymer is combined with silica gel particles to form a composite film, and then the composite film is uniformly covered on the surface of the fiber, so that the surface free energy of the PP non-woven fabric is greatly reduced, the hydrophobic and oleophobic characteristics are presented, the liquid drops are easy to roll on the surface of the fabric after contacting with water, the fabric has good self-cleaning performance, dust is not easy to accumulate on the surface of the fabric, the advantages of no water absorption, no dust accumulation, long-acting filtration and long service life are achieved, the air filter is endowed with good air purification effect, frequent filter element replacement is avoided, and the air purification cost is reduced;
an antibacterial layer is also prepared in the process of preparing the air filter assembly, 4-aminopyridine is added into chloroform to obtain a 4-aminopyridine solution, 2-butenoyl chloride is added into chloroform to obtain a 2-butenoyl chloride solution, the 2-butenoyl chloride solution is dropwise added into the 4-aminopyridine solution under stirring, stirring and reacting are carried out, vacuum filtration is carried out after the reaction is finished, a filter cake is washed and dried to constant weight to obtain an intermediate 1, the intermediate 1 is dissolved in N, N-dimethylformamide, 1-dodecyl bromine is added for reaction, vacuum reduced pressure distillation is carried out, a distillation product is recrystallized, filtered and dried to obtain an intermediate 2, benzophenone is added into absolute ethyl alcohol, the intermediate 2 is added to obtain a grafting solution, the dried PP non-woven fabric is placed into the grafting solution for soaking, taking out, draining the liquid, placing on an ultraviolet irradiation table, irradiating by using an ultraviolet light source, washing the irradiated PP non-woven fabric, and drying to constant weight to obtain an antibacterial layer; 4-aminopyridine and 2-butenoic acid acyl chloride react to generate an intermediate 1, the intermediate 1 reacts with 1-dodecyl bromine to generate an intermediate 2, the intermediate 2 is quaternary ammonium salt, the quaternary ammonium salt enables tissues to change by utilizing the surface adsorption effect to cause the damage of bacterial cell membranes, the intermediate 2 is grafted to a molecular chain of a PP non-woven fabric by taking benzophenone as a photoinitiator, so that the PP non-woven fabric is endowed with good antibacterial performance, the filtered air is further subjected to antibacterial sterilization, impurities in the air passing through an antibacterial layer are basically removed, the air filter is further endowed with good air purification effect, the human body is prevented from being sick due to the fact that the human body inhales bacteria, and the safety performance is high.
Drawings
The invention will be further described with reference to the accompanying drawings;
FIG. 1 is a schematic view of a composite air cleaner assembly of the present disclosure;
FIG. 2 is a schematic view of the internal construction of a composite air cleaner assembly of the present invention;
FIG. 3 is a schematic view of the structure of the filter paper of the present invention;
in the figure: 1. an outer housing; 2. an air inlet pipe; 3. an air outlet pipe; 4. an air filter element; 41. a filter layer; 42. and (4) an antibacterial layer.
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.
As shown in fig. 1-3, a composite air filter assembly includes an outer housing 1 and an air filter element 4 installed inside the outer housing 1, wherein an air outlet pipe 3 is installed at the top of the outer housing 1, an air inlet pipe 2 is installed at one side of the top of the outer housing 1, the air inlet pipe 2 is communicated to an inner cavity of the outer housing, the bottom end of the air outlet pipe 3 is located in the inner cavity of the air filter element 4, filter paper is installed on the peripheral surface of the air filter element 4, and the filter paper is formed by combining a filter layer 41 and an antibacterial layer 42;
example 1:
this example is a filter layer, which is prepared by the following steps:
the method comprises the following steps: stirring tetramethoxysilane, methyltrimethoxysilane and methanol for 20min at the stirring speed of 100r/min to obtain a mixed solution, then dropwise adding oxalic acid into the mixed solution, controlling the dropwise adding time to be 10min, continuously stirring for 20h at the temperature of 20 ℃ and the stirring speed of 50r/min, then dropwise adding ammonia water and continuously stirring for 20min to obtain sol;
step two: placing the sol in a vacuum drying oven, drying at the temperature of 35 ℃ until gel is completely formed, and aging the gel at the temperature of 50 ℃ for 40h to obtain a product A;
step three: adding the product A into methanol, then ultrasonically dispersing for 2H under the condition that the ultrasonic frequency is 40KHz to obtain gel dispersion liquid, adding concentrated hydrochloric acid into the gel dispersion liquid under the condition that the stirring speed is 100r/min, continuously stirring for 30min, then adding 1H,1H,2H, 2H-perfluorooctyltrimethoxysilane, and continuously stirring for 15H under the conditions that the temperature is 20 ℃ and the stirring speed is 300r/min to obtain a surface modifier;
step four: and (2) soaking the PP non-woven fabric into the surface modifier for 1h, taking out, air-drying at room temperature, standing at room temperature for 24h in an ammonia atmosphere, and finally drying in an oven to obtain the filter layer.
Example 2:
this example is a filter layer, which is prepared by the following steps:
the method comprises the following steps: stirring tetramethoxysilane, methyltrimethoxysilane and methanol for 40min at the stirring speed of 200r/min to obtain a mixed solution, then dropwise adding oxalic acid into the mixed solution, controlling the dropwise adding time to be 20min, continuously stirring for 30h at the temperature of 30 ℃ and the stirring speed of 100r/min, then dropwise adding ammonia water and continuously stirring for 30min to obtain sol;
step two: placing the sol in a vacuum drying oven, drying at the temperature of 45 ℃ until gel is completely formed, and carrying out aging treatment on the gel at the temperature of 60 ℃ for 50h to obtain a product A;
step three: adding the product A into methanol, then carrying out ultrasonic dispersion for 3H under the condition that the ultrasonic frequency is 60KHz to obtain gel dispersion liquid, adding concentrated hydrochloric acid into the gel dispersion liquid under the condition that the stirring speed is 200r/min, continuing to stir for 50min, then adding 1H,1H,2H, 2H-perfluorooctyltrimethoxysilane, and continuing to stir for 20H under the conditions that the temperature is 20-30 ℃ and the stirring speed is 500r/min to obtain a surface modifier;
step four: and (2) soaking the PP non-woven fabric into the surface modifier for 2h, taking out, air-drying at room temperature, standing at room temperature for 24h in an ammonia atmosphere, and finally drying in an oven to obtain the filter layer.
Example 3:
this example is an antibacterial layer, and the preparation process of the antibacterial layer is as follows:
s1: adding 4-aminopyridine into chloroform, and uniformly dispersing at a stirring speed of 100r/min to obtain a 4-aminopyridine solution;
s2: cooling to 0 ℃ in an ice water bath, adding 2-butenoyl chloride into chloroform, and uniformly dispersing at a stirring speed of 100r/min to obtain a 2-butenoyl chloride solution;
s3: dropwise adding a 2-butenoic acid acyl chloride solution into a 4-aminopyridine solution under stirring, controlling the dropwise adding time to be 30min, continuously stirring and reacting for 1h under the conditions that the temperature is 0 ℃ and the stirring speed is 100r/min, finishing the reaction, carrying out vacuum filtration, washing a filter cake for 3 times by using acetone, then placing the filter cake in a vacuum drying box, and drying the filter cake to constant weight under the condition that the temperature is 50 ℃ to obtain an intermediate 1;
s4: dissolving the intermediate 1 in N, N-dimethylformamide, adding 1-dodecyl bromide, reacting for 4h at 90 ℃, then carrying out vacuum reduced pressure distillation to remove the N, N-dimethylformamide, recrystallizing a distillation product in an ether-ethanol mixed solvent, filtering, placing a filter cake in a vacuum drying oven, and drying for 24h at 50 ℃ to obtain an intermediate 2;
s5: adding benzophenone into absolute ethyl alcohol, stirring at a stirring speed of 300r/min until benzophenone is completely dissolved, adding an intermediate 2, continuously stirring for 20min to obtain a grafting solution, soaking a PP non-woven fabric in an acetone solution for 2h, taking out, washing with deionized water for 3 times, then placing the PP non-woven fabric in a vacuum drying oven, drying at a temperature of 35 ℃ to constant weight, then placing the dried PP non-woven fabric in the grafting solution for soaking for 30min, taking out, draining the solution, placing on an ultraviolet irradiation table, irradiating with an ultraviolet light source for 0.5h, turning over once midway, washing the irradiated PP non-woven fabric with deionized water for 3 times, then placing in an ethanol solution for ultrasonic washing for 10min, then washing with deionized water for 3 times, finally placing in the vacuum drying oven, drying at a temperature of 35 ℃ to constant weight, an antibacterial layer is obtained.
Example 4:
this example is an antibacterial layer, and the preparation process of the antibacterial layer is as follows:
s1: adding 4-aminopyridine into chloroform, and uniformly dispersing at a stirring speed of 200r/min to obtain a 4-aminopyridine solution;
s2: cooling to 5 ℃ in an ice water bath, adding 2-butenoyl chloride into chloroform, and uniformly dispersing at a stirring speed of 200r/min to obtain a 2-butenoyl chloride solution;
s3: dropwise adding the 2-butenoic acid acyl chloride solution into the 4-aminopyridine solution under stirring, controlling the dropwise adding time to be 50min, continuously stirring and reacting for 2h under the conditions that the temperature is 5 ℃ and the stirring speed is 200r/min, finishing the reaction, carrying out vacuum filtration, washing a filter cake for 5 times by using acetone, then placing the filter cake in a vacuum drying box, and drying the filter cake to constant weight under the condition that the temperature is 60 ℃ to obtain an intermediate 1;
s4: dissolving the intermediate 1 in N, N-dimethylformamide, adding 1-dodecyl bromide, reacting for 5h at 100 ℃, then carrying out vacuum reduced pressure distillation to remove the N, N-dimethylformamide, recrystallizing a distillation product in an ether-ethanol mixed solvent, filtering, placing a filter cake in a vacuum drying oven, and drying for 30h at 60 ℃ to obtain an intermediate 2;
s5: adding benzophenone into absolute ethyl alcohol, stirring at a stirring speed of 500r/min until benzophenone is completely dissolved, adding an intermediate 2, continuously stirring for 40min to obtain a grafting solution, soaking a PP non-woven fabric in an acetone solution for 4h, taking out, washing with deionized water for 5 times, then placing the PP non-woven fabric in a vacuum drying oven, drying at a temperature of 45 ℃ to constant weight, then placing the dried PP non-woven fabric in the grafting solution for soaking for 50min, taking out, draining the solution, placing on an ultraviolet irradiation table, irradiating for 1h by using an ultraviolet light source, turning over once midway, washing the irradiated PP non-woven fabric with deionized water for 5 times, then placing in the ethanol solution for ultrasonic washing for 20min, then washing with deionized water for 5 times, finally placing in a vacuum drying oven, drying at a temperature of 45 ℃ to constant weight, an antibacterial layer is obtained.
Example 5:
this example is a composite air filter assembly, which is prepared by combining the filter layer prepared in example 1 and the antibacterial layer prepared in example 3 to form a filter paper, then preparing an air filter element from the filter paper according to a conventional filter element production method, and then installing the air filter element in an outer housing to form a filter.
Example 6:
in this embodiment, a filter layer prepared in example 2 and an antibacterial layer prepared in example 4 are combined to form a filter paper, and then the filter paper is prepared into an air filter element according to a conventional filter element production method, and the air filter element is installed in an outer housing to form a filter.
Comparative example 1:
the embodiment is a combined type air filter assembly, and two layers of PP non-woven fabrics are compounded to form filter paper, then the filter paper is made into an air filter element according to a conventional filter element production method, and the air filter element is installed in an outer shell to form a filter.
Comparative example 2:
the embodiment is a combined type air filter assembly, a layer of PP non-woven fabric and the filter layer prepared in the embodiment 2 are combined to form filter paper, then the filter paper is prepared into an air filter element according to a conventional filter element production method, and the air filter element is installed in an outer shell to form the filter.
Comparative example 3:
this embodiment is a combined type air cleaner assembly, compound a layer of PP non-woven fabrics and the antibiotic layer that embodiment 4 made and form filter paper, later make air filter according to the conventional method of filter core production with this filter paper, install air filter in the shell body again, form the filter.
The air cleaning performance of the filters of examples 5 to 6 and comparative examples 1 to 3 was measured, and the antibacterial performance of the filter paper for preparing the air filter element in the production process was measured, and the measurement results are shown in the following table:
as can be seen from the above table, under the same test conditions, the laser PM2.5 sensor is used to test the capture rates of PM2.5 and PM1.0 before and after forced passing through the air filter element in a sealed system, the filters of examples 5 and 6 have the best capture effect on PM2.5, the capture rate can reach more than 99%, and the capture effect on smaller PM1.0 is more than 88%, while the capture rates of comparative examples 1 and 3 are lower, while the filter layer of comparative example 2 has a higher capture rate, so the filter layer plays the most important role in filtration; when the antibacterial rate is tested, the antibacterial rates of the embodiments 5 and 6 can reach more than 98%, the comparative examples 1 and 2 have lower antibacterial rates, and the comparative example 3 has higher antibacterial rates, so that the antibacterial layer plays the most important antibacterial role, the filter layer is the outer layer and is in contact with air firstly, impurities in the air can be fully filtered, the antibacterial layer is the inner layer and is in contact with the air filtered by the filter layer to perform antibacterial treatment, and the air filter element is formed by compounding the filter layer and the antibacterial layer, so that the air filter element has good filtering effect and antibacterial effect, and the combined air filter assembly has good using effect.
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 (9)
1. The composite air filter assembly comprises an outer shell (1) and an air filter element (4) installed inside the outer shell (1), and is characterized in that an air outlet pipe (3) is installed at the top of the outer shell (1), an air inlet pipe (2) is installed on one side of the top of the outer shell (1), the air inlet pipe (2) is communicated into an inner cavity of the outer shell, the bottom end of the air outlet pipe (3) is located in the inner cavity of the air filter element (4), filter paper is installed on the peripheral surface of the air filter element (4), and the filter paper is formed by compounding a filter layer (41) and an antibacterial layer (42);
the filter layer is prepared by the following steps:
the method comprises the following steps: stirring tetramethoxysilane, methyltrimethoxysilane and methanol for 20-40min under the condition that the stirring speed is 100-200r/min to obtain a mixed solution, then dropwise adding oxalic acid into the mixed solution, controlling the dropwise adding time to be 10-20min, continuously stirring for 20-30h under the conditions that the temperature is 20-30 ℃ and the stirring speed is 50-100r/min, then dropwise adding ammonia water and continuously stirring for 20-30min to obtain sol;
step two: placing the sol in a vacuum drying oven, drying at the temperature of 35-45 ℃ until gel is completely formed, and carrying out aging treatment on the gel at the temperature of 50-60 ℃ for 40-50h to obtain a product A;
step three: adding the product A into methanol, then carrying out ultrasonic dispersion for 2-3H under the condition that the ultrasonic frequency is 40-60KHz to obtain gel dispersion liquid, adding concentrated hydrochloric acid into the gel dispersion liquid under the condition that the stirring speed is 100-200r/min, continuing to stir for 30-50min, then adding 1H,1H,2H, 2H-perfluorooctyltrimethoxysilane, and continuing to stir for 15-20H under the conditions that the temperature is 20-30 ℃ and the stirring speed is 300-500r/min to obtain a surface modifier;
step four: and (2) immersing the PP non-woven fabric into the surface modifier, soaking for 1-2h, taking out, air-drying at room temperature, standing for 24h at room temperature in an ammonia atmosphere, and finally drying in an oven to obtain the filter layer.
2. The composite air cleaner assembly of claim 1, wherein in step one, the volume ratio of tetramethoxysilane to methyltrimethoxysilane to methanol to oxalic acid to ammonia is 7:3:60:5:5, the concentration of oxalic acid is 0.1mol/L, and the concentration of ammonia is 10 mol/L.
3. The composite air cleaner assembly of claim 1, wherein the amount ratio of the product a, methanol, concentrated hydrochloric acid, 1H, 2H-perfluorooctyltrimethoxysilane in step two is 1 g: 11mL of: 150 μ L of: 0.15g, and the mass fraction of the concentrated hydrochloric acid is 37%.
4. The composite air cleaner assembly of claim 1, wherein the antimicrobial layer is formed by:
s1: adding 4-aminopyridine into chloroform, and uniformly dispersing at a stirring speed of 100-;
s2: cooling to 0-5 ℃ in an ice water bath, adding 2-butenoic acid acyl chloride into chloroform, and uniformly dispersing under the condition that the stirring speed is 100-200r/min to obtain a 2-butenoic acid acyl chloride solution;
s3: dropwise adding the 2-butenoic acid acyl chloride solution into the 4-aminopyridine solution under stirring, controlling the dropwise adding time to be 30-50min, continuously stirring and reacting for 1-2h under the conditions that the temperature is 0-5 ℃ and the stirring speed is 100-200r/min, after the reaction is finished, carrying out vacuum filtration, washing a filter cake for 3-5 times by using acetone, then placing the filter cake into a vacuum drying box, and drying the filter cake to constant weight under the condition that the temperature is 50-60 ℃ to obtain an intermediate 1;
s4: dissolving the intermediate 1 in N, N-dimethylformamide, adding 1-dodecyl bromide, reacting for 4-5h at 90-100 ℃, then carrying out vacuum reduced pressure distillation to remove the N, N-dimethylformamide, recrystallizing a distillation product in an ether-ethanol mixed solvent, filtering, placing a filter cake in a vacuum drying oven, and drying for 24-30h at 50-60 ℃ to obtain an intermediate 2;
s5: adding benzophenone into absolute ethyl alcohol, stirring at the stirring speed of 300-500r/min until benzophenone is completely dissolved, then adding an intermediate 2, continuously stirring for 20-40min to obtain a grafting solution, soaking a PP non-woven fabric in an acetone solution for 2-4h, taking out, cleaning with deionized water for 3-5 times, then placing the PP non-woven fabric in a vacuum drying box, drying at the temperature of 35-45 ℃ to constant weight, then placing the dried PP non-woven fabric in the grafting solution for soaking for 30-50min, taking out, draining the liquid, placing on an ultraviolet irradiation table, irradiating with an ultraviolet light source for 0.5-1h, turning over once in the middle, washing the irradiated PP non-woven fabric with deionized water for 3-5 times, then placing in an ethanol solution, ultrasonically washing for 10-20min, then washing with deionized water for 3-5 times, finally placing in a vacuum drying oven, and drying at 35-45 deg.C to constant weight to obtain antibacterial layer.
5. The composite air cleaner assembly of claim 4, wherein the amount ratio of 4-aminopyridine to chloroform in step S1 is 0.05 mol: 50 mL.
6. The composite air cleaner assembly of claim 4, wherein the ratio of the 2-butenoyl chloride to the chloroform in step S2 is 0.05 mol: 50 mL.
7. The composite air filter assembly of claim 4, wherein the volume ratio of the 2-butenoyl chloride solution to the 4-aminopyridine solution in step S3 is 5: 6.
8. The composite air cleaner assembly of claim 4, wherein the intermediate 1, N-dimethylformamide, and 1-dodecylbromide are used in a ratio of 0.05 mol: 100mL of: 0.04mol, wherein the diethyl ether-ethanol mixed solvent is a mixture of diethyl ether and ethanol according to a ratio of 1: 1.
9. The composite air filter assembly of claim 4, wherein the ratio of benzophenone, absolute ethanol and intermediate 2 in step S5 is 1 g: 12mL of: 10 g.
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