CN113262565A - High-strength air filter core material and preparation method thereof - Google Patents
High-strength air filter core material and preparation method thereof Download PDFInfo
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- CN113262565A CN113262565A CN202110419404.4A CN202110419404A CN113262565A CN 113262565 A CN113262565 A CN 113262565A CN 202110419404 A CN202110419404 A CN 202110419404A CN 113262565 A CN113262565 A CN 113262565A
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/413—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties containing granules other than absorbent substances
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/425—Cellulose series
- D04H1/4258—Regenerated cellulose series
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
- D04H1/492—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/728—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
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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
- B01D2239/0407—Additives and treatments of the filtering material comprising particulate additives, e.g. adsorbents
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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
- B01D2239/0604—Arrangement of the fibres in the filtering material
- B01D2239/0631—Electro-spun
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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
-
- 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
- B01D2239/0663—The layers being joined by hydro-entangling
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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
Abstract
The invention discloses a high-strength air filter core material and a preparation method thereof, wherein special superfine fibers are used for preparing the filter core material, and the superfine fibers with uniform thickness change generate slip flow on the surface with smaller diameter, so that more air flow carrying particle pollutants passes through the surface area with larger diameter, and the filtering effect is enhanced; the hollow spheres also enable the prepared air filter core material to have high strength and stronger antibacterial performance; through twice different spunlaces, zinc powder is uniformly dispersed on the surfaces of superfine fibers by the first spunlace, and the second spunlace is carried out under the ultrahigh pressure condition, so that the pores on one side of the prepared double-layer non-woven fabric are more used for adsorption, and the pores on the other side of the double-layer non-woven fabric are less used for fixation, so that adsorbed dust and particles are prevented from escaping from gaps again.
Description
Technical Field
The invention relates to the field of new materials, in particular to a high-strength air filter core material and a preparation method thereof.
Background
In recent years, with the increase in the air tightness of residential environments, the daily life environment has changed greatly, and the demand for improvement of air environments has increased. Therefore, as a measure for improving the air environment, an air filter is installed in a room such as a house, and substances harmful and useless to the indoor environment, such as dust and smoke, contained in the indoor air are collected, and odor and the like are adsorbed and removed, thereby purifying the air.
And when air is purified, the antibacterial effect can be achieved, and the air purifier is very practical. The air filter core material which has high strength and can resist and inhibit bacteria is a promising prospect for research and development. Therefore, it is very necessary to prepare a high strength air filter core material.
Disclosure of Invention
The present invention is directed to a high strength air filter core material to solve the above problems of the background art.
In order to solve the above technical problem, a first aspect of the present invention provides the following technical solutions: the preparation method of the high-strength air filter core material is characterized in that the process flow for preparing the high-strength air filter core material is as follows:
preparing titanium carbonitride powder hollow spheres, preparing a spinning solution, carrying out high-voltage electrostatic spinning, preparing non-woven fabrics by carrying out first spunlace, and preparing the non-woven fabrics by carrying out second ultrahigh-voltage spunlace.
Preferably, the method comprises the following specific steps:
(1) under the condition of room temperature and pressure, adding deionized water, absolute ethyl alcohol, 30% hydrogen peroxide solution and 40% hydrofluoric acid solution into a polytetrafluoroethylene lining with the volume 10 times that of the deionized water according to a certain proportion, and mixing to prepare a mixed solution;
(2) adding titanium carbonitride powder into the mixed solution, uniformly stirring, placing the mixed solution into a sealed high-pressure reaction kettle, carrying out hot water reaction at 180 ℃ for 24 hours, washing the obtained hollow spheres by deionized water and ethanol in sequence after the reaction, and drying the hollow spheres in an oven at 60-80 ℃ for 8-12 hours to prepare the titanium carbonitride powder hollow spheres;
(3) mixing the titanium carbonitride powder hollow spheres and titanium carbonitride powder according to a certain proportion, adding the mixture into the NMMO solution, and uniformly stirring to obtain a spinning solution;
(4) transferring the prepared spinning solution into a spinning nozzle of a metal needle, wherein the anode is a copper wire, the cathode is ITO glass, the distance between the spinning nozzle and the ITO glass is 10cm, the flow rate is 1.0mL/h, the voltage is set to be an alternating current with the maximum voltage of 50-80 kV under the conditions that the relative humidity is 40-50% and the temperature is 22-28 ℃, and when the voltage changes from 30-50 kV, -30-50 kV or 50-80 kV, -50-80 kV, the superfine fibers are collected on the ITO glass;
(5) finely opening and carding part of superfine fibers, forming a non-woven fabric web in a mixed and disorderly manner, uniformly dispersing zinc powder in deionized water to prepare a spunlace liquid for first spunlace preparation, wherein the specification of a needle plate of a water needle is a high-density sawtooth type inlet water needle plate of 0.8-1.1 mm, and preparing a first layer of spunlace non-woven fabric;
(6) heating the first layer of spunlace non-woven fabric in a high-temperature heating furnace, preserving heat for a period of time, and naturally cooling to obtain a non-woven fabric with tetrapod-like zinc oxide;
(7) and (3) finely opening the other part of superfine fibers on the non-woven fabric with the tetrapod-like zinc oxide, carding and disordering to form a non-woven fabric fiber web, performing secondary high-pressure spunlace preparation, wherein the spunlace liquid is water, the needle plate specification of a water needle is a high-density sawtooth type inlet water needle plate with the diameter of 0.8-1.1 mm, and drying at 120 ℃ after the secondary high-pressure spunlace preparation to obtain a finished product.
Preferably, in the step (2) above: the volume ratio of the titanium carbonitride powder to the deionized water is 1: 40.
preferably, in the step (3) above: the mass ratio of the titanium carbonitride powder hollow spheres to the titanium carbonitride powder is 2: 5-7; the volume ratio of the mixture of the titanium carbonitride powder hollow spheres and the titanium carbonitride powder to the NMMO solution is 1: 0.8 to 1.
Preferably, in the step (5) above: the volume ratio of the zinc powder to the deionized water is 1: 10; the spunlace pressure is 2.5MPa, the spraying time is controlled to be 5-10 min, and the production line speed is 10 m/min.
Preferably, in the step (6) above: the heating temperature is 950-1050 ℃; the heat preservation time is 0.5-1 h.
Preferably, in the step (7) above: the spunlace pressure is 25MPa, the spraying time is controlled to be 2-5 min, and the production line speed is 10 m/min.
In a second aspect of the present invention, a method for preparing a high strength air filter core material is characterized in that the core material prepared by the method for preparing a high strength air filter core material comprises the following raw materials in parts by weight: : 100-200 parts of titanium carbonitride powder, 40-80 parts of titanium carbonitride powder hollow spheres, 80-200 parts of NMMO solution and 10-20 parts of zinc powder.
Preferably, the particle size of the zinc powder is less than 0.8 mm.
Compared with the prior art, the invention has the following beneficial effects:
preparing a filter element material by using special superfine fibers; preparing titanium carbonitride powder into hollow spheres and adding the hollow spheres and the mixed titanium carbonitride powder into electrostatic spinning solution to perform high-voltage electrostatic spinning, wherein alternating current is used during the high-voltage electrostatic spinning; the periodic variation ensures that the prepared loose and porous superfine fiber has uniform thickness variation, the hollow spheres in the fiber can be damaged in different degrees under the condition of high pressure variation, the surface area is increased, simultaneously, fragments generated by damage can be filled in the parts of the superfine fiber which are thinner and cannot have the hollow spheres along with the titanium carbonitride powder, and the influence on the property of the material due to different weights caused by different thicknesses is avoided; the uniform superfine fibers with different thicknesses generate slip flow on the surface with smaller diameter, so that more air flow carrying particle pollutants passes through the surface area with larger diameter, and the filtering effect is enhanced; the hollow spheres also enable the prepared air filter core material to have high strength and strong antibacterial performance.
Carrying out first spunlace on superfine fibers prepared by high-voltage electrostatic spinning to prepare non-woven fabrics, and dispersing zinc powder in water and uniformly stirring to obtain a spunlace solution; directly placing the non-woven fabric prepared by the first spunlace in an air atmosphere for heating, keeping the non-woven fabric at a certain temperature for a period of time, then naturally carding and placing the rest superfine fibers on the non-woven fabric, and carrying out the second ultrahigh pressure spunlace preparation, wherein the spunlace solution is water; uniformly dispersing zinc powder on the surface of the superfine fiber by first spunlace, heating and evaporating inorganic components in the superfine fiber to ensure that concave holes exist on the surface of the non-woven fabric prepared by the first spunlace layer, so that the adsorption capacity is enhanced; heating, naturally cooling to oxidize the zinc powder into tetrapod-like zinc oxide, and tightly embedding the zinc oxide into the superfine fibers; the second layer of superfine fiber is tightly entangled on the surface of the non-woven fabric prepared by the first layer of spunlace under the condition of ultrahigh pressure by the second spunlace; the double-layer non-woven fabric prepared in the way has more pores on one side for adsorption and less pores on the other side for fixation, so that adsorbed dust and particles are prevented from escaping from gaps again.
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.
The first aspect of the invention provides the following technical scheme: the preparation method of the high-strength air filter core material is characterized in that the process flow for preparing the high-strength air filter core material is as follows:
preparing titanium carbonitride powder hollow spheres, preparing a spinning solution, carrying out high-voltage electrostatic spinning, preparing non-woven fabrics by carrying out first spunlace, and preparing the non-woven fabrics by carrying out second ultrahigh-voltage spunlace.
Preferably, the method comprises the following specific steps:
(1) under the condition of room temperature and pressure, adding deionized water, absolute ethyl alcohol, 30% hydrogen peroxide solution and 40% hydrofluoric acid solution into a polytetrafluoroethylene lining with the volume 10 times that of the deionized water according to a certain proportion, and mixing to prepare a mixed solution;
(2) adding titanium carbonitride powder into the mixed solution, uniformly stirring, placing the mixed solution into a sealed high-pressure reaction kettle, carrying out hot water reaction at 180 ℃ for 24 hours, washing the obtained hollow spheres by deionized water and ethanol in sequence after the reaction, and drying the hollow spheres in an oven at 60-80 ℃ for 8-12 hours to prepare the titanium carbonitride powder hollow spheres;
(3) mixing the titanium carbonitride powder hollow spheres and titanium carbonitride powder according to a certain proportion, adding the mixture into the NMMO solution, and uniformly stirring to obtain a spinning solution;
(4) transferring the prepared spinning solution into a spinning nozzle of a metal needle, wherein the anode is a copper wire, the cathode is ITO glass, the distance between the spinning nozzle and the ITO glass is 10cm, the flow rate is 1.0mL/h, the voltage is set to be an alternating current with the maximum voltage of 50-80 kV under the conditions that the relative humidity is 40-50% and the temperature is 22-28 ℃, and when the voltage changes from 30-50 kV, -30-50 kV or 50-80 kV, -50-80 kV, the superfine fibers are collected on the ITO glass;
(5) finely opening and carding part of superfine fibers, forming a non-woven fabric web in a mixed and disorderly manner, uniformly dispersing zinc powder in deionized water to prepare a spunlace liquid for first spunlace preparation, wherein the specification of a needle plate of a water needle is a high-density sawtooth type inlet water needle plate of 0.8-1.1 mm, and preparing a first layer of spunlace non-woven fabric;
(6) heating the first layer of spunlace non-woven fabric in a high-temperature heating furnace, preserving heat for a period of time, and naturally cooling to obtain a non-woven fabric with tetrapod-like zinc oxide;
(7) and (3) finely opening the other part of superfine fibers on the non-woven fabric with the tetrapod-like zinc oxide, carding and disordering to form a non-woven fabric fiber web, performing secondary high-pressure spunlace preparation, wherein the spunlace liquid is water, the needle plate specification of a water needle is a high-density sawtooth type inlet water needle plate with the diameter of 0.8-1.1 mm, and drying at 120 ℃ after the secondary high-pressure spunlace preparation to obtain a finished product.
Preferably, in the step (2) above: the volume ratio of the titanium carbonitride powder to the deionized water is 1: 40.
preferably, in the step (3) above: the mass ratio of the titanium carbonitride powder hollow spheres to the titanium carbonitride powder is 2: 5-7; the volume ratio of the mixture of the titanium carbonitride powder hollow spheres and the titanium carbonitride powder to the NMMO solution is 1: 0.8 to 1.
Preferably, in the step (5) above: the volume ratio of the zinc powder to the deionized water is 1: 10; the spunlace pressure is 2.5MPa, the spraying time is controlled to be 5-10 min, and the production line speed is 10 m/min.
Preferably, in the step (6) above: the heating temperature is 950-1050 ℃; the heat preservation time is 0.5-1 h.
Preferably, in the step (7) above: the spunlace pressure is 25MPa, the spraying time is controlled to be 2-5 min, and the production line speed is 10 m/min.
In a second aspect of the present invention, a method for preparing a high strength air filter core material is characterized in that the core material prepared by the method for preparing a high strength air filter core material comprises the following raw materials in parts by weight: : 100-200 parts of titanium carbonitride powder, 40-80 parts of titanium carbonitride powder hollow spheres, 80-200 parts of NMMO solution and 10-20 parts of zinc powder.
Preferably, the particle size of the zinc powder is less than 0.8 mm.
Example 1: high strength air filter core material one:
a high strength air filter core material comprising, in parts by weight:
100 parts of titanium carbonitride powder, 40 parts of hollow titanium carbonitride powder balls, 80 parts of NMMO solution and 10 parts of zinc powder.
The preparation method of the core material comprises the following steps:
(1) under the condition of room temperature and pressure, deionized water, absolute ethyl alcohol, a hydrogen peroxide solution with the mass fraction of 30% and a hydrofluoric acid solution with the mass fraction of 40% are mixed according to the volume ratio of 25: 25: 20: 2, adding the mixture into a polytetrafluoroethylene lining with the volume 10 times that of deionized water for mixing to prepare a mixed solution;
(2) adding titanium carbonitride powder into the mixed solution, wherein the volume ratio of the titanium carbonitride powder to the deionized water is 1: 40, uniformly stirring, placing in a sealed high-pressure reaction kettle, carrying out hot water reaction at 180 ℃ for 24 hours, washing the obtained hollow spheres by using deionized water and ethanol in sequence after the reaction, and drying in an oven at 60-80 ℃ for 8 hours to obtain titanium carbonitride powder hollow spheres;
(3) mixing titanium carbonitride powder hollow spheres and titanium carbonitride powder according to the mass ratio of 2: 5, adding the mixture into the NMMO solution, wherein the volume ratio of the mixture of the titanium carbonitride powder hollow spheres and the titanium carbonitride powder to the NMMO solution is 1: 0.8, uniformly stirring to prepare spinning solution;
(4) transferring the prepared spinning solution into a spinning nozzle of a metal needle, wherein the anode is a copper wire, the cathode is ITO glass, the distance between the spinning nozzle and the ITO glass is 10cm, the flow rate is 1.0mL/h, the voltage is set to be 80kV alternating current at the maximum voltage under the conditions that the relative humidity is 40% and the temperature is 22 ℃, and when the voltage changes from 50kV to 80kV and-50 kV to-80 kV, the superfine fibers are collected on the ITO glass;
(5) finely opening part of superfine fibers, carding and forming a non-woven fabric fiber web in a mess, uniformly dispersing zinc powder in deionized water to prepare a spunlace liquid for first spunlace preparation, wherein the volume ratio of the zinc powder to the deionized water is 1: 10; the specification of a needle plate of the used water needle is a high-density sawtooth type inlet water needle plate with the diameter of 0.9mm, the water jet pressure is 2.5MPa, the jet time is controlled to be 5min, and the production line speed is 10m/min, so that a first layer of water jet non-woven fabric is prepared;
(6) heating the first layer of spunlace non-woven fabric in a high-temperature heating furnace to 950 ℃, preserving heat for 0.5h, and naturally cooling to obtain a non-woven fabric with tetrapod-like zinc oxide;
(7) and (3) finely opening the other part of superfine fibers on a non-woven fabric with tetrapod-like zinc oxide, carding and disordering to form a non-woven fabric web, performing secondary high-pressure spunlace preparation, wherein the spunlace liquid is water, the specification of a needle plate of a water needle is a high-density sawtooth type inlet water needle plate with the diameter of 0.9mm, the spunlace pressure is 25MPa, the spraying time is controlled to be 2min, the production line speed is 10m/min, and after the secondary high-pressure spunlace preparation, drying is performed at 120 ℃ to obtain a finished product.
Example 2: high strength air filter core material two:
a high strength air filter core material comprising, in parts by weight:
100 parts of titanium carbonitride powder, 40 parts of hollow titanium carbonitride powder balls, 80 parts of NMMO solution and 10 parts of zinc powder.
The preparation method of the core material comprises the following steps:
(1) under the condition of room temperature and pressure, deionized water, absolute ethyl alcohol, a hydrogen peroxide solution with the mass fraction of 30% and a hydrofluoric acid solution with the mass fraction of 40% are mixed according to the volume ratio of 25: 25: 20: 2, adding the mixture into a polytetrafluoroethylene lining with the volume 10 times that of deionized water for mixing to prepare a mixed solution;
(2) adding titanium carbonitride powder into the mixed solution, wherein the volume ratio of the titanium carbonitride powder to the deionized water is 1: 40, uniformly stirring, placing in a sealed high-pressure reaction kettle, carrying out hot water reaction at 180 ℃ for 24 hours, washing the obtained hollow sphere by using deionized water and ethanol in sequence after the reaction, and drying in an oven at 60-80 ℃ for 12 hours to obtain the titanium carbonitride powder hollow sphere;
(3) mixing titanium carbonitride powder hollow spheres and titanium carbonitride powder according to the mass ratio of 2: 5, adding the mixture into the NMMO solution, wherein the volume ratio of the mixture of the titanium carbonitride powder hollow spheres and the titanium carbonitride powder to the NMMO solution is 1: 0.8, uniformly stirring to prepare spinning solution;
(4) transferring the prepared spinning solution into a spinning nozzle of a metal needle, wherein the anode is a copper wire, the cathode is ITO glass, the distance between the spinning nozzle and the ITO glass is 10cm, the flow rate is 1.0mL/h, the voltage is set to be 50kV alternating current at the maximum voltage under the conditions that the relative humidity is 50% and the temperature is 28 ℃, and when the voltage changes between 30-50 kV and-30-50 kV, the superfine fibers are collected on the ITO glass;
(5) finely opening part of superfine fibers, carding and forming a non-woven fabric fiber web in a mess, uniformly dispersing zinc powder in deionized water to prepare a spunlace liquid for first spunlace preparation, wherein the volume ratio of the zinc powder to the deionized water is 1: 10; the specification of a needle plate of the used water needle is a high-density sawtooth type inlet water needle plate with the diameter of 1.1mm, the water jet pressure is 2.5MPa, the jet time is controlled to be 10min, and the production line speed is 10m/min, so that a first layer of water jet non-woven fabric is prepared;
(6) heating the obtained first layer of spunlace non-woven fabric in a high-temperature heating furnace to 1050 ℃, preserving heat for 1h, and naturally cooling to obtain non-woven fabric with tetrapod-like zinc oxide;
(7) and (3) finely opening the other part of superfine fibers on a non-woven fabric with tetrapod-like zinc oxide, carding and disordering to form a non-woven fabric web, performing secondary high-pressure spunlace preparation, wherein the spunlace liquid is water, the specification of a needle plate of a water needle is a high-density sawtooth type inlet water needle plate with the diameter of 1.1mm, the spunlace pressure is 25MPa, the spraying time is controlled to be 5min, the production line speed is 10m/min, and after the secondary high-pressure spunlace preparation, drying is performed at 120 ℃ to obtain a finished product.
Comparative example 1
The formulation of comparative example 1 was the same as example 1. The preparation method of the air filter core material is different from that of the example 1 only in the difference of the step (4), and the step (4) is modified as follows: transferring the prepared spinning solution into a spinning nozzle of a metal needle, wherein the anode is a copper wire, the cathode is ITO glass, the distance between the spinning nozzle and the ITO glass is 10cm, the flow rate is 1.0mL/h, the voltage is set to be 50kV under the conditions that the relative humidity is 50% and the temperature is 28 ℃, and collecting the superfine fiber on the ITO glass. The rest of the preparation steps are the same as example 1.
Comparative example 2
Comparative example 2 was formulated as in example 1. The preparation method of the air filter core material is different from that of example 1 only in the difference of step (5), and the step (5) is modified as follows: and (2) finely opening and carding part of superfine fibers, and disordering to form a non-woven fabric web, wherein a spunlace solution is an aqueous solution, the specification of a needle plate of a water needle is a high-density sawtooth type inlet water needle plate with the diameter of 0.9mm, the spunlace pressure is 2.5MPa, the spraying time is controlled to be 5min, the production line speed is 10m/min, and after the first layer of spunlace non-woven fabric is prepared, zinc powder is uniformly sprayed on the surface of the first layer of spunlace non-woven fabric. The rest of the preparation steps are the same as example 1.
Comparative example 3
The formulation of comparative example 3 was the same as example 1. The manufacturing method of the air filter core material is different from that of example 1 only in that the step (7) is not performed and the step (6) directly produces the finished product. The rest of the preparation steps are the same as example 1.
Test example 1
1. Test method
Example 1 and comparative examples 1 and 2 are comparative tests, and example 1 and comparative examples 1 and 2 are cut into a size of 50cm × 50cm, and the maximum force value of the tensile machine at the time of complete tearing thereof is measured by the tensile machine, respectively, for comparison.
2. Test results
Example 1 is compared to the maximum force value of the tensile machine at full tear of comparative examples 1, 2.
TABLE 1 maximum force values
By comparing the maximum force value of the tensile machine when the core material prepared in the example 1 is completely torn with the core material prepared in the comparative examples 1 and 2, the fact that the core material prepared in the example 1 can be completely torn with a large force can be obviously found, which indicates that the high-pressure electrostatic spinning method for preparing ultrafine fibers with uniform and variable thickness and the spunlace method for making zinc powder enter the ultrafine fibers can enhance the strength of the core material, and indicates that the high-strength air filter core material prepared in the invention has high strength.
Test example 2
1. Test method
Example 1 and comparative example 3 are comparative tests, and example 1 and comparative example 3 are cut into a size of 50cm × 50cm and subjected to a dust transmittance test for comparison.
2. Test results
Comparison of dust Permeability of example 1 with comparative example 3
TABLE 2 dust transmittance
| Dust transmittance (%) | |
| Example 1 | 0.21 |
| Comparative example 3 | 2.33 |
By comparing the dust permeability of example 1 with that of comparative example 3, it can be obviously found that the dust permeability of the core material prepared in example 1 is lower, which indicates that the double-layer structure can block more dust, and indicates that the high-strength air filter core material prepared by the invention not only has higher strength, but also has higher filtering capacity.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The preparation method of the high-strength air filter core material is characterized in that the process flow for preparing the high-strength air filter core material is as follows: preparing titanium carbonitride powder hollow spheres, preparing a spinning solution, carrying out high-voltage electrostatic spinning, preparing non-woven fabrics by carrying out first spunlace, and preparing the non-woven fabrics by carrying out second ultrahigh-voltage spunlace.
2. The method for preparing the high-strength air filter core material as claimed in claim 1, comprising the following steps:
(1) under the condition of room temperature and pressure, adding deionized water, absolute ethyl alcohol, 30% hydrogen peroxide solution and 40% hydrofluoric acid solution into a polytetrafluoroethylene lining with the volume 10 times that of the deionized water according to a certain proportion, and mixing to prepare a mixed solution;
(2) adding titanium carbonitride powder into the mixed solution, uniformly stirring, placing the mixed solution into a sealed high-pressure reaction kettle, carrying out hot water reaction at 180 ℃ for 24 hours, washing the obtained hollow spheres by deionized water and ethanol in sequence after the reaction, and drying the hollow spheres in an oven at 60-80 ℃ for 8-12 hours to prepare the titanium carbonitride powder hollow spheres;
(3) mixing the titanium carbonitride powder hollow spheres and titanium carbonitride powder according to a certain proportion, adding the mixture into the NMMO solution, and uniformly stirring to obtain a spinning solution;
(4) transferring the prepared spinning solution into a spinning nozzle of a metal needle, wherein the anode is a copper wire, the cathode is ITO glass, the distance between the spinning nozzle and the ITO glass is 10cm, the flow rate is 1.0mL/h, the voltage is set to be an alternating current with the maximum voltage of 50-80 kV under the conditions that the relative humidity is 40-50% and the temperature is 22-28 ℃, and when the voltage changes from 30-50 kV, -30-50 kV or 50-80 kV, -50-80 kV, the superfine fibers are collected on the ITO glass;
(5) finely opening and carding part of superfine fibers, forming a non-woven fabric web in a mixed and disorderly manner, uniformly dispersing zinc powder in deionized water to prepare a spunlace liquid for first spunlace preparation, wherein the specification of a needle plate of a water needle is a high-density sawtooth type inlet water needle plate of 0.8-1.1 mm, and preparing a first layer of spunlace non-woven fabric;
(6) heating the first layer of spunlace non-woven fabric in a high-temperature heating furnace, preserving heat for a period of time, and naturally cooling to obtain a non-woven fabric with tetrapod-like zinc oxide;
(7) and (3) finely opening the other part of superfine fibers on the non-woven fabric with the tetrapod-like zinc oxide, carding and disordering to form a non-woven fabric fiber web, performing secondary high-pressure spunlace preparation, wherein the spunlace liquid is water, the needle plate specification of a water needle is a high-density sawtooth type inlet water needle plate with the diameter of 0.8-1.1 mm, and drying at 120 ℃ after the secondary high-pressure spunlace preparation to obtain a finished product.
3. The method for preparing a high strength air filter core material as claimed in claim 2, wherein in the step (1): the volume ratio of the deionized water to the absolute ethyl alcohol to the hydrogen peroxide solution with the mass fraction of 30% to the hydrofluoric acid solution with the mass fraction of 40% is 25: 25: 20: 2.
4. the method for preparing a high strength air filter core material as claimed in claim 2, wherein in the step (2): the volume ratio of the titanium carbonitride powder to the deionized water is 1: 40.
5. the method for preparing a high strength air filter core material as claimed in claim 2, wherein in the step (3): the mass ratio of the titanium carbonitride powder hollow spheres to the titanium carbonitride powder is 2: 5-7; the volume ratio of the mixture of the titanium carbonitride powder hollow spheres and the titanium carbonitride powder to the NMMO solution is 1: 0.8 to 1.
6. The method for preparing a high strength air filter core material as claimed in claim 2, wherein in the step (5): the volume ratio of the zinc powder to the deionized water is 1: 10; the spunlace pressure is 2.5MPa, the spraying time is controlled to be 5-10 min, and the production line speed is 10 m/min.
7. The method for preparing a high strength air filter core material as claimed in claim 2, wherein in the step (6): the heating temperature is 950-1050 ℃; the heat preservation time is 0.5-1 h.
8. The method for preparing a high strength air filter core material as claimed in claim 2, wherein in the step (7): the spunlace pressure is 25MPa, the spraying time is controlled to be 2-5 min, and the production line speed is 10 m/min.
9. The method for preparing the core material of the high-strength air filter as claimed in claim 1, wherein the core material prepared by the method for preparing the core material of the high-strength air filter comprises the following raw materials in parts by weight: 100-200 parts of titanium carbonitride powder, 10-25 parts of titanium carbonitride powder hollow spheres, 80-200 parts of NMMO solution and 40-80 parts of zinc powder.
10. The method as claimed in claim 1, wherein the zinc powder has a particle size of less than 0.8 mm.
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