CN111359312A - Five-layer symmetrical polyurethane-polyacrylonitrile nano fiber efficient durable air filter disc - Google Patents
Five-layer symmetrical polyurethane-polyacrylonitrile nano fiber efficient durable air filter disc Download PDFInfo
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- CN111359312A CN111359312A CN202010240261.6A CN202010240261A CN111359312A CN 111359312 A CN111359312 A CN 111359312A CN 202010240261 A CN202010240261 A CN 202010240261A CN 111359312 A CN111359312 A CN 111359312A
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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
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/08—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyacrylonitrile as constituent
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/16—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one other macromolecular compound obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds as constituent
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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
- B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
- B01D2239/0216—Bicomponent or multicomponent fibres
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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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- Textile Engineering (AREA)
- Nonwoven Fabrics (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention relates to the technical field of high polymer materials, in particular to a five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc. The filter comprises a strong supporting layer, a functional supporting layer and a filtering functional layer; the functional supporting layer comprises an inner functional supporting layer and an outer functional supporting layer which are respectively and symmetrically arranged at two sides of the filtering functional layer; the strong supporting layer comprises an inner strong supporting layer and an outer strong supporting layer which are respectively arranged at the outer sides of the inner functional supporting layer and the outer functional supporting layer; the preparation raw material of the filtering functional layer is polyurethane; the preparation raw materials of the strong supporting layer and the functional supporting layer comprise polyurethane and polyacrylonitrile, and the weight average molecular weight of the polyacrylonitrile is not less than 9 ten thousand. The filter has excellent thermal stability and dimensional structure stability, has high filtering effect while having low respiratory resistance, and can be repeatedly used after high-temperature sterilization and disinfection for many times.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc.
Background
Air pollution can not only generate destructive influence on surrounding objects through physical, chemical and biological erosion, but also generate serious toxic action on respiratory tract systems, nervous systems, immunity, skin and the like of people through parts such as respiratory systems, skin epidermis and the like of people. When people live or work in an environment with poor air quality for a long time, the respiratory function is reduced, the respiratory symptoms are aggravated, diseases such as chronic bronchitis, bronchial asthma, emphysema and the like can be caused, and the prevalence rate of lung cancer and nasopharyngeal carcinoma can be increased seriously. For this reason, people often use protective masks to filter and purify inhaled air. At present, the filter sheets of the protective mask are mainly classified into two categories, namely dust prevention and gas defense. They all function to absorb and block harmful aerosols, including dust, smoke, droplets and toxic gases, from human inhalation through the filter. For a good respirator filter, the following three conditions should be present: firstly, the filtering efficiency is high under the condition that the mask is well sealed with the face of a user; secondly, the respiratory resistance is small; thirdly, the user feels comfortable.
The existing conventional protective mask is generally made of polypropylene, polyethylene and the like through an SM melt-blown process, and the effect of filtering micro particles and microorganisms in air is achieved mainly through pores formed by non-woven fabrics. The fibers of the protective materials manufactured by the non-woven fabrics and the combination of each layer are only diffusion bonding among raw material molecules, the combination force is weak, the formed pores have poor stability and cannot be subjected to treatment such as high temperature or water boiling, and after the operations such as water boiling, high temperature treatment and the like, the filtering effect is seriously reduced because the pore structure is damaged, so that the conventional protective mask cannot be repeatedly used for many times, and the service life of a filter sheet in the conventional protective mask is short.
Disclosure of Invention
In order to solve the technical problems, the invention provides a five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc in a first aspect, which comprises a strong supporting layer, a functional supporting layer and a filtering functional layer; the functional supporting layer comprises an inner functional supporting layer and an outer functional supporting layer which are respectively and symmetrically arranged at two sides of the filtering functional layer; the strong supporting layer comprises an inner strong supporting layer and an outer strong supporting layer which are respectively arranged at the outer sides of the inner functional supporting layer and the outer functional supporting layer; the preparation raw material of the filtering functional layer is polyurethane; the preparation raw materials of the strong supporting layer and the functional supporting layer comprise polyurethane and polyacrylonitrile, and the weight average molecular weight of the polyacrylonitrile is not less than 9 ten thousand.
As a preferable technical scheme, the weight average molecular weight of the polyacrylonitrile is 9-18 ten thousand; preferably, it has a weight average molecular weight of 15 ten thousand.
As a preferred technical scheme, the weight ratio of the polyurethane to the polyacrylonitrile in the raw materials for preparing the strong supporting layer and the functional supporting layer is 1: (0.8 to 1.5).
As a preferred technical scheme, the weight ratio of the polyurethane to the polyacrylonitrile in the raw materials for preparing the functional support layer is 1: 1.
as a preferable technical scheme, the weight ratio of the polyurethane to the polyacrylonitrile in the raw materials for preparing the strong supporting layer is 1: 1.5.
as a preferable technical scheme, the Shore hardness of the polyurethane is 56-60D.
As a preferable technical scheme, the strong supporting layer is composed of electrospun polyurethane and polyacrylonitrile composite fibers, the diameter of each composite fiber is 1-5 microns, and the thickness of each composite fiber is 10-50 microns; the functional supporting layer is composed of electrospun polyurethane and polyacrylonitrile composite fibers, the diameter of each composite fiber is 0.5-1.0 mu m, and the thickness of each composite fiber is 5-10 mu m; the filtering functional layer is composed of electrospun polyurethane nanofibers, the diameter of the fibers is 0.05-0.5 μm, and the thickness of the fibers is 0.5-3 μm.
The second aspect of the invention provides a preparation method of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber high-efficiency durable air filter disc, which comprises the following steps:
step one, preparation of spinning solution: respectively taking polyurethane and polyacrylonitrile raw materials according to a weight ratio, respectively dissolving the polyurethane and polyacrylonitrile raw materials in an organic solvent, or mixing the two raw materials, dissolving the mixture in the organic solvent, and defoaming to obtain a polyurethane spinning solution and a polyacrylonitrile spinning solution, or defoaming to obtain a mixed spinning solution;
step two, electrostatic spinning: five groups of electrostatic spinning heads are arranged on a line in sequence, extrusion electrospinning is carried out, and fibers formed by electrospinning sequentially fall on a steel conveyor belt in a layering manner to form a five-layer composite structure non-woven fabric with different fiber diameters;
step three, post-treatment: and (3) introducing the non-woven fabric with the five-layer composite structure into a drying furnace through a conveyor belt, and removing residual solvent in the fiber at 100-150 ℃ to obtain the five-layer symmetrical polyurethane-polyacrylonitrile composite fiber efficient and durable air filter disc.
As a preferable technical scheme, the mass concentration of the first group and the fifth group of mixed spinning solution in the five groups of electrostatic spinning is 15-22 wt%, and the absolute viscosity is 3.0-7.0 Pa.S; the mass concentration of the second group and the fourth group of mixed spinning solution is 12-18 wt%, and the absolute viscosity is 1.5-2.5 Pa.S.
The third aspect of the invention provides the application of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber high-efficiency durable air filter disc in the medical protection field.
Has the advantages that: the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc has excellent thermal stability and dimensional structure stability, has low respiratory resistance and high filtering effect, and can be repeatedly used after being sterilized at high temperature for many times. Specifically, the thermal decomposition temperature is more than 400 ℃; the softening temperature is higher than 160 ℃; washing resistance and friction resistance; the porosity is higher than 90%; the average pore diameter of the functional layer is less than 0.3 micron, and the pressure difference under the air flow rate of 85L/min is less than 200 Pa; the interception rate of the mask for the particles with the particle size of more than 0.3 micron is more than 99.9 percent, which is far better than the filtering effect of an N95 mask for the 95 percent interception rate of the particles with the particle size of 0.3 micron; durability: the sterilizing treatment processing required by repeated use such as steaming resistance, washing resistance, microwave heating resistance and the like has the repeated use rate of more than 15 times.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.
The invention provides a five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc in a first aspect, which comprises a strong supporting layer, a functional supporting layer and a filtering functional layer; the functional supporting layer comprises an inner functional supporting layer and an outer functional supporting layer which are respectively and symmetrically arranged at two sides of the filtering functional layer; the strong supporting layer comprises an inner strong supporting layer and an outer strong supporting layer which are respectively arranged at the outer sides of the inner functional supporting layer and the outer functional supporting layer; the preparation raw material of the filtering functional layer is polyurethane; the preparation raw materials of the strong supporting layer and the functional supporting layer comprise polyurethane and polyacrylonitrile, and the weight average molecular weight of the polyacrylonitrile is not less than 9 ten thousand.
The polyacrylonitrile is obtained by free radical polymerization of acrylonitrile monomer, and acrylonitrile units in a macromolecular chain are connected in a joint-tail mode. The polyacrylonitrile fiber of the invention has good heat retention, antibiosis, mildew resistance, moth resistance, light aging resistance, easily available raw materials, and excellent radiation resistance and corrosion resistance, so the polyacrylonitrile fiber is widely applied to the fields of clothes, decoration and industry, and the output of the polyacrylonitrile fiber is the fourth position in synthetic fiber at present. Because of the inherent hydrophobicity and insulativity of the polyacrylonitrile fiber, the polyacrylonitrile fiber has poor hand feeling, hygroscopicity and dyeability, and is easy to generate static electricity, thereby limiting the application of the polyacrylonitrile in many fields. According to the invention, polyacrylonitrile and polyurethane are combined, and the advantages are made up for the disadvantages, so that the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber high-efficiency durable air filter with excellent comprehensive performance is prepared.
The applicant finds that the weight average molecular weight of polyacrylonitrile has a crucial influence on the structural stability and the dimensional stability of the finally prepared air filter disc, and if the weight average molecular weight is not properly selected, the structural stability of the filter disc is easily reduced, and the reuse rate of the filter disc after sterilization and disinfection is influenced. When the weight average molecular weight of polyacrylonitrile is in the range of 9-18 ten thousand, especially about 15 ten thousand, the prepared air filter has the longest service life, which exceeds 15 times. Probably because the weight-average molecular weight is high, the molecular chain and the chain segment of the polyurethane can be better physically entangled to form a plurality of entanglement points, so that the formed three-dimensional network structure is more stable. However, the weight average molecular weight of the composite fiber is too high, so that the repeated use of the air filter sheet is obviously reduced, the change of conformation capability of the composite fiber in a solution is hindered probably because of the too high weight average molecular weight, and after electrostatic spinning, the mutual diffusion and entanglement capability between polyacrylonitrile molecular chains and polyurethane molecular chains in the forming process of the composite fiber is influenced, so that the composite fiber cannot be well diffused and fused on the microstructure, and the physical and chemical properties of the composite fiber are influenced.
The polyacrylonitrile in the invention has a weight average molecular weight of not less than 9 ten thousand.
Further, the weight average molecular weight of the polyacrylonitrile is 9-18 ten thousand.
Preferably, it has a weight average molecular weight of 15 ten thousand.
The polyacrylonitrile in the present invention can be obtained from the market, such as the Jilin chemical fiber factory.
The polyurethane in the present invention is a polymer material obtained by polymerization of an isocyanate (e.g., diphenylmethane diisocyanate (MDI), Toluene Diisocyanate (TDI)) with a macromolecular polyol (e.g., polyester polyol, polyether polyol, etc.) and a chain extender. The molecular structure of the material is formed by alternately reacting a rigid block obtained by reacting diphenylmethane diisoate (MDI), Toluene Diisoate (TDI) and a chain extender and a flexible chain segment obtained by reacting diphenylmethane diisoate (MDI), Toluene Diisoate (TDI) and macromolecular polyol, has the characteristics of excellent high tension, high tensile force, toughness and aging resistance, and is a mature environment-friendly material.
In some embodiments, the polyurethane has a Shore hardness of 56-60D.
Further, the wear resistance of the polyurethane is 150 ± 15 Mg.
Wherein the Shore hardness of the polyurethane is measured according to the ASTM D2240 standard, and the abrasion resistance is measured according to the ASTM D395 standard. The invention selects spinning-grade polyurethane material, which can be purchased from the market. For example, PU98A from basf, germany may be used.
The weight proportions of the polyurethane and the polyacrylonitrile in the raw materials for preparing the strong supporting layer and the functional supporting layer can be the same or different.
In some embodiments, the weight ratios of the polyurethane and polyacrylonitrile in the raw materials for preparing the strong support layer and the functional support layer are not the same,
further, the weight ratio of the polyurethane to the polyacrylonitrile in the raw materials for preparing the strong supporting layer and the functional supporting layer is 1: (0.8 to 1.5).
Further, the weight ratio of the polyurethane to the polyacrylonitrile in the raw materials for preparing the functional supporting layer is 1: 1.
further, the weight ratio of the polyurethane to the polyacrylonitrile in the raw materials for preparing the strong supporting layer is 1: 1.5.
the applicant finds that the mechanical strength of the air filter piece can be effectively improved by reasonably regulating and controlling the raw material ratio of the strong supporting layer and the functional supporting layer of the air filter piece, so that the air filter piece prepared by electrostatic spinning has better structural stability and dimensional stability, can still keep a good microstructure state under the environments of poaching, microwave heating and the like, and avoids that the pores of the air filter piece are distorted and damaged in the operation process to cause that the pore distribution and the structure of the filter piece are not uniform and stable any more, thereby influencing the filtering effect after sterilization and disinfection and influencing the reuse times of the filter piece.
In some embodiments, the strong support layer is composed of electrospun polyurethane and polyacrylonitrile composite fibers, the diameter of the composite fibers is 1-5 μm, and the thickness of the composite fibers is 10-50 μm; the functional supporting layer is composed of electrospun polyurethane and polyacrylonitrile composite fibers, the diameter of each composite fiber is 0.5-1.0 mu m, and the thickness of each composite fiber is 5-10 mu m; the filtering functional layer is composed of electrospun polyurethane nanofibers, the diameter of the fibers is 0.05-0.5 μm, and the thickness of the fibers is 0.5-3 μm.
In the invention, the inner side and the outer side of the core filtering function layer are symmetrically provided with the superfine fiber function supporting layer and the thicker fiber strong supporting layer, and the fibers with different diameters of each layer are mutually lapped and woven into a three-dimensional reticular structure to trap particles and germs in the environment layer by layer. In addition, because the outermost strong supporting layer is thick in fiber, large in strength and large in pore size, the direction of particles in the environment is changed due to the reaction of inertia and force after the particles collide on the surface of the outermost strong supporting layer, and the particles are settled or adhered to the outermost strong supporting layer, so that the core filtering function layer can be effectively protected. And because the diameters of the outermost layer and the secondary outer layer are relatively thick, the formed three-dimensional net structure is relatively stable, and trapped particles are easily removed when the fiber is subjected to sterilization treatment processing required by repeated use such as water boiling, water washing, high-temperature baking, ultraviolet radiation or microwave heating, so that the porosity of the fiber is basically consistent before and after the treatment, and the filtering efficiency is not lost.
The second aspect of the invention provides a preparation method of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber high-efficiency durable air filter disc, which comprises the following steps:
step one, preparation of spinning solution: respectively taking polyurethane and polyacrylonitrile raw materials according to a weight ratio, respectively dissolving the polyurethane and polyacrylonitrile raw materials in an organic solvent, or mixing the two raw materials, dissolving the mixture in the organic solvent, and defoaming to obtain a polyurethane spinning solution and a polyacrylonitrile spinning solution, or defoaming to obtain a mixed spinning solution;
step two, electrostatic spinning: five groups of electrostatic spinning heads are arranged on a line in sequence, extrusion electrospinning is carried out, and fibers formed by electrospinning sequentially fall on a steel conveyor belt in a layering manner to form a five-layer composite structure non-woven fabric with different fiber diameters;
step three, post-treatment: and (3) introducing the non-woven fabric with the five-layer composite structure into a drying furnace through a conveyor belt, and removing residual solvent in the fiber at 100-150 ℃ to obtain the five-layer symmetrical polyurethane-polyacrylonitrile composite fiber efficient and durable air filter disc.
In some embodiments, the mass concentration of the first group and the fifth group mixed spinning solution in the five groups of electrostatic spinning is 15-22 wt%, and the absolute viscosity is 3.0-7.0 Pa.S; the mass concentration of the second group and the fourth group of mixed spinning solution is 12-18 wt%, and the absolute viscosity is 1.5-2.5 Pa.S.
Further, the mass concentration of the first group and the fifth group of mixed spinning solution in the five groups of electrostatic spinning is 22 wt%, and the absolute viscosity is 6.5 Pa.S; the mass concentration of the second group and the fourth group of mixed spinning solution is 15 wt%, and the absolute viscosity is 2.2 Pa.S.
In some embodiments, the mass concentration of the third group spinning solution in the five groups of electrostatic spinning is 6 to 10 wt%, and the absolute viscosity is 0.5 to 1.4 Pa.S.
Furthermore, the mass concentration of the third group of spinning solution in the five groups of electrostatic spinning is 8 wt%, and the absolute viscosity is 0.8 Pa.S.
Further, the preparation method of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc comprises the following steps:
step one, preparation of spinning solution: respectively taking polyurethane and polyacrylonitrile raw materials according to a weight ratio, respectively dissolving the polyurethane and polyacrylonitrile raw materials in an organic solvent, or mixing the two raw materials, dissolving the mixture in the organic solvent, and defoaming to obtain a polyurethane spinning solution and a polyacrylonitrile spinning solution, or defoaming to obtain a mixed spinning solution;
secondly, five groups of electrostatic spinning heads are sequentially arranged on a line, the first group and the fifth group are respectively provided with three spray heads, the mass concentration of the polyurethane spinning solution and the polyacrylonitrile spinning solution is about 22%, and the absolute viscosity is 3.0-7.0 Pa.S; the second group and the fourth group are respectively provided with two spray heads, the mass concentration of the polyurethane and polyacrylonitrile spinning solution is about 15%, and the absolute viscosity is 1.5-2.5 Pa.S; and a third group of spray heads, wherein the mass concentration of the polyurethane spinning solution is about 8%, and the absolute viscosity is 0.5-1.4 Pa.S.
Step three, sequentially layering polyurethane, polyacrylonitrile composite fibers and polyurethane fibers formed by electrospinning and falling on a steel conveyor belt to form five-layer composite-structure non-woven fabrics with different fiber diameters, introducing the non-woven fabrics into a drying furnace through the conveyor belt, and removing residual solvent in the fibers at 100-150 ℃ to form a polyurethane-polyacrylonitrile super air filter disc, wherein the area size of the filter disc is as follows: 120 x 150-200 x 250cm2。
The spinning solution can be prepared by independently dissolving polyurethane and polyacrylonitrile in an organic solvent, then mixing the solution, standing and defoaming. Or mixing the polyurethane and polyacrylonitrile raw materials, adding a solvent, dissolving, standing and defoaming to obtain the spinning solution. The type of the organic solvent is not particularly limited, and any solvent that can dissolve polyacrylonitrile and polyurethane together can be selected, including but not limited to dimethylformamide, dimethylacetamide, 1-methyl-2-pyrrolidone, and the like.
The third aspect of the invention provides the application of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber high-efficiency durable air filter disc in the medical protection field.
Examples
Example 1: the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc comprises a strong supporting layer, a functional supporting layer and a filtering functional layer; the functional supporting layer comprises an inner functional supporting layer and an outer functional supporting layer which are respectively and symmetrically arranged at two sides of the filtering functional layer; the strong supporting layer comprises an inner strong supporting layer and an outer strong supporting layer which are respectively arranged at the outer sides of the inner functional supporting layer and the outer functional supporting layer; the preparation raw material of the filtering functional layer is polyurethane; the preparation raw materials of the strong supporting layer and the functional supporting layer comprise polyurethane and polyacrylonitrile, and the weight average molecular weight of the polyacrylonitrile is 15 ten thousand. The strong supporting layer is composed of electrospun polyurethane and polyacrylonitrile composite fibers, wherein the weight ratio of polyurethane to polyacrylonitrile is 1: 1.5, the diameter of the composite fiber is 3 μm, and the thickness is 30 μm; the functional supporting layer is composed of electrospun superfine polyurethane and polyacrylonitrile composite fibers, wherein the weight ratio of the polyurethane to the polyacrylonitrile is 1: 1, the diameter of the composite fiber is 0.7 μm, and the thickness is 8 μm; the filtering functional layer is composed of electrospun polyurethane nanofibers, the diameter of the fibers is 0.15 μm, and the thickness of the fibers is 1.2 μm. Wherein the polyurethane is PU98A from Pasteur, Germany; the polyacrylonitrile was purchased from Jilin chemical fiber Mill.
The preparation method of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc comprises the following steps:
step one, preparation of spinning solution: respectively taking polyurethane and polyacrylonitrile raw materials according to a weight ratio, respectively dissolving the polyurethane and polyacrylonitrile raw materials in an N, N-dimethylformamide organic solvent, standing and defoaming to obtain mixed spinning solutions with different mass concentrations; dissolving polyurethane in an N, N-dimethylformamide organic solvent, standing and defoaming to obtain a polyurethane spinning solution;
secondly, five groups of electrostatic spinning heads are sequentially arranged on a line, the first group and the fifth group are respectively provided with three spray heads, the mass concentration of the polyurethane spinning solution and the polyacrylonitrile spinning solution is about 22 percent, and the absolute viscosity is 6.5 Pa.S; the second group and the fourth group are respectively provided with two nozzles, the mass concentration of the polyurethane and polyacrylonitrile spinning solution is about 15%, and the absolute viscosity is 2.2 Pa.S; and a third group of nozzles, wherein the mass concentration of the polyurethane spinning solution is about 8%, and the absolute viscosity is 0.8 Pa.S.
Step three, sequentially layering polyurethane and polyacrylonitrile composite fibers formed by electrospinning and polyurethane fibers on a steel conveyor belt to form five-layer composite-structure non-woven fabrics with different fiber diameters, introducing the non-woven fabrics into a drying furnace through the conveyor belt, removing residual solvent in the fibers at 150 ℃, and forming a polyurethane-polyacrylonitrile super air filter disc, wherein the area size of the filter disc is as follows: 160 x 200cm2。
The thermal decomposition temperature of the five-layer symmetrical polyurethane-polyacrylonitrile nano fiber efficient and durable air filter in the embodiment is about 427 ℃; the softening temperature is about 188 ℃; washing resistance and friction resistance; porosity about 94%; the average pore diameter of the functional layer is 0.24 micron, and the pressure difference is about 211Pa under the air flow rate of 85L/min; the interception rate of the particles with the particle size of more than 0.3 micron is more than 99.9 percent; baking the mixture in a 160 ℃ oven for 1 hour, taking out the mixture, boiling the mixture in water for 45min, drying the mixture, and repeating the operation for 15 times to simulate the repeated use process, wherein the interception rate of the particles with the particle size of more than 0.3 micrometer is about 96.0%.
Example 2: the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc comprises a strong supporting layer, a functional supporting layer and a filtering functional layer; the functional supporting layer comprises an inner functional supporting layer and an outer functional supporting layer which are respectively and symmetrically arranged at two sides of the filtering functional layer; the strong supporting layer comprises an inner strong supporting layer and an outer strong supporting layer which are respectively arranged at the outer sides of the inner functional supporting layer and the outer functional supporting layer; the preparation raw material of the filtering functional layer is polyurethane; the preparation raw materials of the strong supporting layer and the functional supporting layer comprise polyurethane and polyacrylonitrile, and the weight-average molecular weight of the polyacrylonitrile is 8.5 ten thousand. The strong supporting layer is composed of electrospun polyurethane and polyacrylonitrile composite fibers, wherein the weight ratio of polyurethane to polyacrylonitrile is 1: 1.5, the diameter of the composite fiber is 3 μm, and the thickness is 30 μm; the workThe energy supporting layer is composed of electrospun superfine polyurethane and polyacrylonitrile composite fibers, wherein the weight ratio of the polyurethane to the polyacrylonitrile is 1: 1, the diameter of the composite fiber is 0.7 μm, and the thickness is 8 μm; the filtering functional layer is composed of electrospun polyurethane nanofibers, the diameter of the fibers is 0.15 μm, and the thickness of the fibers is 1.2 μm. Wherein the polyurethane is PU98A from Pasteur, Germany; the polyacrylonitrile was purchased from Jilin chemical fiber Mill.
The preparation method of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc comprises the following steps:
step one, preparation of spinning solution: respectively taking polyurethane and polyacrylonitrile raw materials according to a weight ratio, respectively dissolving the polyurethane and polyacrylonitrile raw materials in an N, N-dimethylformamide organic solvent, standing and defoaming to obtain mixed spinning solutions with different mass concentrations; dissolving polyurethane in an N, N-dimethylformamide organic solvent, standing and defoaming to obtain a polyurethane spinning solution;
secondly, five groups of electrostatic spinning heads are arranged on a line in sequence, the first group and the fifth group are respectively provided with three nozzles, and the mass concentration of the polyurethane spinning solution and the polyacrylonitrile spinning solution is about 22 percent; the second group and the fourth group are respectively provided with two nozzles, and the mass concentration of the polyurethane and polyacrylonitrile spinning solution is about 15 percent; and a third group of spray heads, wherein the mass concentration of the polyurethane spinning solution is about 8%.
Step three, sequentially layering polyurethane and polyacrylonitrile composite fibers formed by electrospinning and polyurethane fibers on a steel conveyor belt to form five-layer composite-structure non-woven fabrics with different fiber diameters, introducing the non-woven fabrics into a drying furnace through the conveyor belt, removing residual solvent in the fibers at 150 ℃, and forming a polyurethane-polyacrylonitrile super air filter disc, wherein the area size of the filter disc is as follows: 160 x 200cm2。
The pressure difference of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient durable air filter disc in the embodiment is about 214Pa under the air flow rate of 85L/min; the interception rate of the particles with the particle size of more than 0.3 micron is more than 99.9 percent; baking the mixture in a 160 ℃ oven for 1 hour, taking out the mixture, boiling the mixture in water for 45min, drying the mixture, and repeating the operation for 15 times to simulate the repeated use process, wherein the interception rate of the particles with the particle size of more than 0.3 micrometer is about 85.0%.
Example 3: the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc comprises a strong supporting layer, a functional supporting layer and a filtering functional layer; the functional supporting layer comprises an inner functional supporting layer and an outer functional supporting layer which are respectively and symmetrically arranged at two sides of the filtering functional layer; the strong supporting layer comprises an inner strong supporting layer and an outer strong supporting layer which are respectively arranged at the outer sides of the inner functional supporting layer and the outer functional supporting layer; the preparation raw material of the filtering functional layer is polyurethane; the preparation raw materials of the strong supporting layer and the functional supporting layer comprise polyurethane and polyacrylonitrile, and the weight average molecular weight of the polyacrylonitrile is 25 ten thousand. The strong supporting layer is composed of electrospun polyurethane and polyacrylonitrile composite fibers, wherein the weight ratio of polyurethane to polyacrylonitrile is 1: 1.5, the diameter of the composite fiber is 3 μm, and the thickness is 30 μm; the functional supporting layer is composed of electrospun superfine polyurethane and polyacrylonitrile composite fibers, wherein the weight ratio of the polyurethane to the polyacrylonitrile is 1: 1, the diameter of the composite fiber is 0.7 μm, and the thickness is 8 μm; the filtering functional layer is composed of electrospun polyurethane nanofibers, the diameter of the fibers is 0.15 μm, and the thickness of the fibers is 1.2 μm. Wherein the polyurethane is PU98A from Pasteur, Germany; the polyacrylonitrile was purchased from Jilin chemical fiber Mill.
The preparation method of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc comprises the following steps:
step one, preparation of spinning solution: respectively taking polyurethane and polyacrylonitrile raw materials according to a weight ratio, respectively dissolving the polyurethane and polyacrylonitrile raw materials in an N, N-dimethylformamide organic solvent, standing and defoaming to obtain mixed spinning solutions with different mass concentrations; dissolving polyurethane in an N, N-dimethylformamide organic solvent, standing and defoaming to obtain a polyurethane spinning solution;
secondly, five groups of electrostatic spinning heads are arranged on a line in sequence, the first group and the fifth group are respectively provided with three nozzles, and the mass concentration of the polyurethane spinning solution and the polyacrylonitrile spinning solution is about 22 percent; the second group and the fourth group are respectively provided with two nozzles, and the mass concentration of the polyurethane and polyacrylonitrile spinning solution is about 15 percent; and a third group of spray heads, wherein the mass concentration of the polyurethane spinning solution is about 8%.
Step three, sequentially layering polyurethane and polyacrylonitrile composite fibers formed by electrospinning and polyurethane fibers on a steel conveyor belt to form five-layer composite-structure non-woven fabrics with different fiber diameters, introducing the non-woven fabrics into a drying furnace through the conveyor belt, removing residual solvent in the fibers at 150 ℃, and forming a polyurethane-polyacrylonitrile super air filter disc, wherein the area size of the filter disc is as follows: 160 x 200cm2。
The pressure difference of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient durable air filter disc in the embodiment is about 207Pa under the air flow rate of 85L/min; the interception rate of the particles with the particle size of more than 0.3 micron is more than 99.9 percent; baking the mixture in a 160 ℃ oven for 1 hour, taking out the mixture, boiling the mixture in water for 45min, drying the mixture, and repeating the operation for 15 times to simulate the repeated use process, wherein the interception rate of the particles with the particle size of more than 0.3 micrometer is about 87.5.0%.
Example 4: the three-layer asymmetric polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc comprises a strong supporting layer, a functional supporting layer and a filtering functional layer; the functional supporting layer and the powerful supporting layer are respectively arranged on two sides of the filtering functional layer; the preparation raw material of the filtering functional layer is polyurethane; the preparation raw materials of the strong supporting layer and the functional supporting layer comprise polyurethane and polyacrylonitrile, and the weight average molecular weight of the polyacrylonitrile is 15 ten thousand. The strong supporting layer is composed of electrospun polyurethane and polyacrylonitrile composite fibers, wherein the weight ratio of polyurethane to polyacrylonitrile is 1: 1.5, the diameter of the composite fiber is 3 μm, and the thickness is 30 μm; the functional supporting layer is composed of electrospun superfine polyurethane and polyacrylonitrile composite fibers, wherein the weight ratio of the polyurethane to the polyacrylonitrile is 1: 1, the diameter of the composite fiber is 0.7 μm, and the thickness is 8 μm; the filtering functional layer is composed of electrospun polyurethane nanofibers, the diameter of the fibers is 0.15 μm, and the thickness of the fibers is 1.2 μm. Wherein the polyurethane is PU98A from Pasteur, Germany; the polyacrylonitrile was purchased from Jilin chemical fiber Mill.
The preparation method of the three-layer asymmetric polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc comprises the following steps:
step one, preparation of spinning solution: respectively taking polyurethane and polyacrylonitrile raw materials according to a weight ratio, respectively dissolving the polyurethane and polyacrylonitrile raw materials in an N, N-dimethylformamide organic solvent, standing and defoaming to obtain mixed spinning solutions with different mass concentrations; dissolving polyurethane in an N, N-dimethylformamide organic solvent, standing and defoaming to obtain a polyurethane spinning solution;
secondly, three groups of electrostatic spinning heads are arranged on a line in sequence, the first group is provided with three spray heads, and the mass concentration of the polyurethane and polyacrylonitrile spinning solution is about 22%; the second group is provided with two nozzles, and the mass concentration of the polyurethane and polyacrylonitrile spinning solution is about 15 percent; and a third group of spray heads, wherein the mass concentration of the polyurethane spinning solution is about 8%.
Step three, sequentially layering polyurethane and polyacrylonitrile composite fibers formed by electrospinning and polyurethane fibers on a steel conveyor belt to form a three-layer composite structure non-woven fabric with different fiber diameters, introducing the non-woven fabric into a drying furnace through the conveyor belt, removing residual solvent in the fibers at 150 ℃, and forming a polyurethane-polyacrylonitrile super air filter disc, wherein the area size of the filter disc is as follows: 160 x 200cm2。
The pressure difference of the three-layer asymmetric polyurethane-polyacrylonitrile nanofiber efficient durable air filter disc in the embodiment is about 194Pa under the air flow rate of 85L/min; the interception rate of the particles with the particle size of more than 0.3 micron is more than 99.9 percent; baking the mixture in a 160 ℃ oven for 1 hour, taking out the mixture, boiling the mixture in water for 45min, drying the mixture, and repeating the operation for 15 times to simulate the repeated use process, wherein the interception rate of the particles with the particle size of more than 0.3 micrometer is about 78.5%.
Example 5: the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc comprises a strong supporting layer, a functional supporting layer and a filtering functional layer; the functional supporting layer comprises an inner functional supporting layer and an outer functional supporting layer which are respectively and symmetrically arranged at two sides of the filtering functional layer; the strong supporting layer comprises an inner strong supporting layer and an outer strong supporting layer which are respectively arranged on the inner functional supporting layer and the outer functional supporting layerThe outside of the support layer; the preparation raw material of the filtering functional layer is polyurethane; the preparation raw materials of the strong supporting layer and the functional supporting layer comprise polyurethane and polyacrylonitrile, and the weight average molecular weight of the polyacrylonitrile is 15 ten thousand. The strong supporting layer is composed of electrospun polyurethane and polyacrylonitrile composite fibers, wherein the weight ratio of polyurethane to polyacrylonitrile is 1: 1, the diameter of the composite fiber is 3 μm, and the thickness of the composite fiber is 30 μm; the functional supporting layer is composed of electrospun superfine polyurethane and polyacrylonitrile composite fibers, wherein the weight ratio of the polyurethane to the polyacrylonitrile is 1: 1, the diameter of the composite fiber is 0.7 μm, and the thickness is 8 μm; the filtering functional layer is composed of electrospun polyurethane nanofibers, the diameter of the fibers is 0.15 μm, and the thickness of the fibers is 1.2 μm. Wherein the polyurethane is PU98A from Pasteur, Germany; the polyacrylonitrile was purchased from Jilin chemical fiber Mill.
The preparation method of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc comprises the following steps:
step one, preparation of spinning solution: respectively taking polyurethane and polyacrylonitrile raw materials according to a weight ratio, respectively dissolving the polyurethane and polyacrylonitrile raw materials in an N, N-dimethylformamide organic solvent, standing and defoaming to obtain mixed spinning solutions with different mass concentrations; dissolving polyurethane in an N, N-dimethylformamide organic solvent, standing and defoaming to obtain a polyurethane spinning solution;
secondly, five groups of electrostatic spinning heads are arranged on a line in sequence, the first group and the fifth group are respectively provided with three nozzles, and the mass concentration of the polyurethane spinning solution and the polyacrylonitrile spinning solution is about 22 percent; the second group and the fourth group are respectively provided with two nozzles, and the mass concentration of the polyurethane and polyacrylonitrile spinning solution is about 15 percent; and a third group of spray heads, wherein the mass concentration of the polyurethane spinning solution is about 8%.
Step three, sequentially layering polyurethane and polyacrylonitrile composite fibers formed by electrospinning and polyurethane fibers on a steel conveyor belt to form five-layer composite-structure non-woven fabrics with different fiber diameters, introducing the non-woven fabrics into a drying furnace through the conveyor belt, removing residual solvent in the fibers at 150 ℃, and forming a polyurethane-polyacrylonitrile super air filter disc, wherein the area size of the filter disc is as follows: 160 x 200cm2。
The pressure difference of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient durable air filter disc in the embodiment is about 216Pa under the air flow rate of 85L/min; the interception rate of the particles with the particle size of more than 0.3 micron is more than 99.9 percent; baking the mixture in a 160 ℃ oven for 1 hour, taking out the mixture, boiling the mixture in water for 45min, drying the mixture, and repeating the operation for 15 times to simulate the repeated use process, wherein the interception rate of the particles with the particle size of more than 0.3 micrometer is about 87.0%.
Example 6: the three-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc comprises a functional supporting layer and a filtering functional layer; the functional supporting layer comprises an inner functional supporting layer and an outer functional supporting layer which are respectively and symmetrically arranged at two sides of the filtering functional layer; the preparation raw material of the filtering functional layer is polyurethane; the preparation raw materials of the functional support layer comprise the polyurethane and polyacrylonitrile, and the weight average molecular weight of the polyacrylonitrile is 15 ten thousand. The functional supporting layer is composed of electrospun superfine polyurethane and polyacrylonitrile composite fibers, wherein the weight ratio of the polyurethane to the polyacrylonitrile is 1: 1, the diameter of the composite fiber is 0.7 μm, and the thickness is 8 μm; the filtering functional layer is composed of electrospun polyurethane nanofibers, the diameter of the fibers is 0.15 μm, and the thickness of the fibers is 1.2 μm. Wherein the polyurethane is PU98A from Pasteur, Germany; the polyacrylonitrile was purchased from Jilin chemical fiber Mill.
The preparation method of the three-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc comprises the following steps:
step one, preparation of spinning solution: respectively taking polyurethane and polyacrylonitrile raw materials according to the weight ratio, respectively dissolving the polyurethane and polyacrylonitrile raw materials in an N, N-dimethylformamide organic solvent, standing and defoaming to obtain a mixed spinning solution; dissolving polyurethane in an N, N-dimethylformamide organic solvent, standing and defoaming to obtain a polyurethane spinning solution;
secondly, three groups of electrostatic spinning heads are arranged on a line in sequence, the first group and the third group are respectively provided with two nozzles, and the mass concentration of the polyurethane spinning solution and the polyacrylonitrile spinning solution is about 15 percent; and the second group is provided with a nozzle, and the mass concentration of the polyurethane spinning solution is about 8 percent.
Step three, sequentially layering polyurethane and polyacrylonitrile composite fibers formed by electrospinning and polyurethane fibers on a steel conveyor belt to form a three-layer composite structure non-woven fabric with different fiber diameters, introducing the non-woven fabric into a drying furnace through the conveyor belt, removing residual solvent in the fibers at 150 ℃, and forming a polyurethane-polyacrylonitrile super air filter disc, wherein the area size of the filter disc is as follows: 160 x 200cm2。
The pressure difference of the three-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient durable air filter disc in the embodiment is about 184Pa under the air flow rate of 85L/min; the interception rate of the particles with the particle size of more than 0.3 micron is more than 99.9 percent; baking the mixture in a 160 ℃ oven for 1 hour, taking out the mixture, boiling the mixture in water for 45min, drying the mixture, and repeating the operation for 15 times to simulate the repeated use process, wherein the interception rate of the particles with the particle size of more than 0.3 micrometer is about 74.0%.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may modify or change the technical content of the above disclosure into equivalent embodiments with equivalent changes, but all those simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the present invention.
Claims (10)
1. A five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc is characterized by comprising a strong supporting layer, a functional supporting layer and a filtering functional layer; the functional supporting layer comprises an inner functional supporting layer and an outer functional supporting layer which are respectively and symmetrically arranged at two sides of the filtering functional layer; the strong supporting layer comprises an inner strong supporting layer and an outer strong supporting layer which are respectively arranged at the outer sides of the inner functional supporting layer and the outer functional supporting layer; the preparation raw material of the filtering functional layer is polyurethane; the preparation raw materials of the strong supporting layer and the functional supporting layer comprise polyurethane and polyacrylonitrile, and the weight average molecular weight of the polyacrylonitrile is not less than 9 ten thousand.
2. The five-layer symmetric polyurethane-polyacrylonitrile nanofiber high-efficiency durable air filter disc as claimed in claim 1, wherein the weight average molecular weight of the polyacrylonitrile is 9 to 18 ten thousand; preferably, it has a weight average molecular weight of 15 ten thousand.
3. The five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc as claimed in claim 1, wherein the weight ratio of the polyurethane to the polyacrylonitrile in the raw materials for preparing the strong support layer and the functional support layer is 1: (0.8 to 1.5).
4. The five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc as claimed in claim 4, wherein the weight ratio of the polyurethane to the polyacrylonitrile in the preparation raw materials of the functional support layer is 1: 1.
5. the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber high-efficiency durable air filter disc as claimed in claim 4, wherein the weight ratio of the polyurethane to the polyacrylonitrile in the preparation raw materials of the strong support layer is 1: 1.5.
6. the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber high-efficiency durable air filter disc as claimed in claim 1, wherein the Shore hardness of the polyurethane is 56-60D.
7. The five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc as claimed in any one of claims 1 to 6, wherein the strong supporting layer is composed of electrospun polyurethane and polyacrylonitrile composite fibers, the diameter of each composite fiber is 1-5 μm, and the thickness of each composite fiber is 10-50 μm; the functional supporting layer is composed of electrospun polyurethane and polyacrylonitrile composite fibers, the diameter of each composite fiber is 0.5-1.0 mu m, and the thickness of each composite fiber is 5-10 mu m; the filtering functional layer is composed of electrospun polyurethane nanofibers, the diameter of the fibers is 0.05-0.5 μm, and the thickness of the fibers is 0.5-3 μm.
8. The preparation method of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
step one, preparation of spinning solution: respectively taking polyurethane and polyacrylonitrile raw materials according to a weight ratio, respectively dissolving the polyurethane and polyacrylonitrile raw materials in an organic solvent, or mixing the two raw materials, dissolving the mixture in the organic solvent, and defoaming to obtain a polyurethane spinning solution and a polyacrylonitrile spinning solution, or defoaming to obtain a mixed spinning solution;
step two, electrostatic spinning: five groups of electrostatic spinning heads are arranged on a line in sequence, extrusion electrospinning is carried out, and fibers formed by electrospinning sequentially fall on a steel conveyor belt in a layering manner to form a five-layer composite structure non-woven fabric with different fiber diameters;
step three, post-treatment: and (3) introducing the non-woven fabric with the five-layer composite structure into a drying furnace through a conveyor belt, and removing residual solvent in the fiber at 100-150 ℃ to obtain the five-layer symmetrical polyurethane-polyacrylonitrile composite fiber efficient and durable air filter disc.
9. The five-layer symmetric polyurethane-polyacrylonitrile nanofiber high-efficiency durable air filter disc as claimed in claim 8, wherein the mass concentration of the mixed spinning solution of the first group and the fifth group in the five groups of electrostatic spinning is 15-22 wt%, and the absolute viscosity is 3.0-7.0 Pa.S; the mass concentration of the second group and the fourth group of mixed spinning solution is 12-18 wt%, and the absolute viscosity is 1.5-2.5 Pa.S.
10. The application of the five-layer symmetrical polyurethane-polyacrylonitrile nanofiber efficient and durable air filter disc as claimed in any one of claims 1 to 7 in the field of medical protection.
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