CN111350102A - Preparation method of aramid fiber nano air filter paper and aramid fiber nano air filter paper - Google Patents
Preparation method of aramid fiber nano air filter paper and aramid fiber nano air filter paper Download PDFInfo
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/08—Filter paper
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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
- B01D39/18—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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0001—Making filtering elements
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/09—Sulfur-containing compounds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/14—Carboxylic acids; Derivatives thereof
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/25—Cellulose
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
Abstract
The invention relates to the technical field of materials, in particular to a preparation method of aramid fiber nano air filter paper and the aramid fiber nano air filter paper. Preparing air filtering base paper; preparing single-walled carbon nanotube dispersion liquid, adding an adhesive and water into the single-walled carbon nanotube dispersion liquid, and stirring to obtain a nano coating; and coating the nano coating on the surface of the air filtering base paper, and drying to obtain the aramid nano air filtering paper. The invention aims to provide an aramid nano air filter paper preparation method and aramid nano air filter paper, and the aramid nano air filter paper preparation method is used for solving the technical problems that in the prior art, nano-scale fibers are arranged in a filter material too tightly, so that the local filter resistance is greatly increased, single-walled carbon nanotubes cannot be uniformly distributed in the filter paper, and the application of the single-walled carbon nanotubes in the filter paper is limited.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a preparation method of aramid fiber nano air filter paper and the aramid fiber nano air filter paper.
Background
The ultrafine particles refer to particles with the particle size of less than 0.1 mu m, can adsorb a large amount of toxic gas, bacteria, viruses and the like in the air, can cause respiratory tract infection, cardiovascular diseases and even death after being absorbed by human bodies, and the exposure of the particles in the living environment of human beings leads people to pay more and more attention to the air quality problem, so that air filtration products become necessities gradually. The filter paper is developed and used in military industry and electronic industry in the second war period, and is prepared with plant fiber as material and through the gravitational effect, diffusion effect, electrostatic effect, collision effect and sieving rate effect of the three-stage net structure of plant fiber on particle. The smaller the diameter of the fiber in the filter paper is, the smaller the pore diameter of the filter paper is, and the smaller the diameter of the filterable particle is, so that the filtration efficiency is improved. The traditional air filter paper is made of natural fibers or synthetic fibers with micron-sized diameters, the aperture of the filter paper is large, the filtering precision is low, and the filtering precision of the filter paper can be greatly improved by applying a nano-grade material to the air filter paper. The carbon nanotube is a nanofiber discovered by a japanese scholars in the restaurant and the orange in 1991, the structure of the carbon nanotube can be considered as a seamless tubular object with one layer (single-walled carbon nanotube) to dozens of layers (multi-walled carbon nanotube) formed by rolling a graphene layer around a central shaft according to a certain spiral angle, the length-diameter ratio of the carbon nanotube is high (up to 1000), the specific surface area is large, and the carbon nanotube has the characteristics of high strength, stretchability, low density, conductivity, antibiosis, high temperature resistance, stable chemical performance and the like; the single-walled carbon nanotube is the finest fiber (the diameter is generally 0.6-2nm) artificially synthesized at present, and is used as a filter fiber, and the air filtration flow is in a molecular flow area, so that the filtration resistance caused by a filter material structure is greatly reduced, and the filtration precision of the filter paper is improved. The fine particles filtered in the industry mostly belong to high-temperature smoke, the common air filter paper has poor heat resistance and can not meet the filtering requirement, and in order to solve the defect, a high-temperature resistant material needs to be added into the air filter paper. The aromatic polyamide fiber (aramid fiber) is a fire-resistant material with light weight, high strength, high modulus and chemical corrosion resistance, and can be applied to the filtration of hot air and high-temperature flue gas; the para-aramid has excellent thermal stability, the modulus and the carbonization temperature of the para-aramid are higher than those of meta-aramid, the para-aramid is commonly used as a raw material for reinforcing protective materials and heat-insulating materials, and the para-aramid can be used in air filter paper to improve the physical property and the high temperature resistance of the filter paper.
At present, in the method for combining the nano-scale fibers and the micron-scale fiber filter media, the nano-scale fibers are arranged too tightly in the filter material, so that the local filtering resistance is greatly increased, the single-walled carbon nanotubes cannot be uniformly distributed in the filter paper, and the application of the single-walled carbon nanotubes in the filter paper is limited.
Therefore, in order to solve the above problems, the present invention provides a method for preparing aramid nano air filter paper and aramid nano air filter paper.
Disclosure of Invention
The invention aims to provide an aramid nano air filter paper preparation method and aramid nano air filter paper, and the aramid nano air filter paper preparation method is used for solving the technical problems that in the prior art, nano-scale fibers are arranged in a filter material too tightly, so that the local filter resistance is greatly increased, single-walled carbon nanotubes cannot be uniformly distributed in the filter paper, and the application of the single-walled carbon nanotubes in the filter paper is limited.
The invention provides a preparation method of aramid nano air filter paper, which comprises the following steps:
preparing air filtering base paper;
preparing single-walled carbon nanotube dispersion liquid, adding an adhesive and water into the single-walled carbon nanotube dispersion liquid, and stirring to obtain a nano coating;
and coating the nano coating on the surface of the air filtering base paper, and drying to obtain the aramid nano air filtering paper.
Further, the preparation process of the single-walled carbon nanotube dispersion liquid comprises the following steps: adding a dispersant into water to prepare a dispersant aqueous solution; and adding the single-walled carbon nanotube into a dispersant aqueous solution, and performing ultrasonic dispersion under the ice-water bath condition to prepare the single-walled carbon nanotube dispersion liquid.
Further, the mass fraction of the wall carbon nanotubes in the single-wall carbon nanotube dispersion liquid is 0.01-0.05%.
Further, the diameter of the single-walled carbon nanotube fiber is 1-2 nm; the length of the single-walled carbon nanotube fiber is 5-30 μm.
Furthermore, the mass fraction of the dispersant in the dispersant aqueous solution is 0.01-1%.
Further, the dispersing agent comprises at least one of nanometer cellulose fiber, sodium dodecyl sulfate or sodium dodecyl benzene sulfonate; when the dispersant is nano cellulose fibers, the mass fraction of the dispersant in the dispersant aqueous solution is 0.05-0.2%; when the dispersant is sodium dodecyl sulfate or sodium dodecyl benzene sulfonate, the mass fraction of the dispersant in the dispersant aqueous solution is 0.01-1.0%.
Further, the mass ratio of the adhesive to the single-walled carbon nanotube dispersion liquid is 1: 0.04-0.68; the adhesive is acrylic emulsion or styrene-acrylic emulsion; the solid content of the prepared nano coating is 10-20%.
Further, the coating amount of the nano coating is 5-30% of the oven dry amount of the coated air filter paper.
Further, the preparation process of the air filtering base paper comprises the following steps: mixing softwood pulp, hardwood pulp, mercerized softwood pulp and para-aramid pulp fiber according to a proportion, dehydrating and drying in vacuum to obtain the air filter base paper.
The invention also discloses aramid nano air filter paper prepared by the preparation method of the aramid nano air filter paper.
Compared with the prior art, the preparation method of the aramid nano air filter paper and the aramid nano air filter paper provided by the invention have the following advantages:
1. the preparation method of the aramid fiber nano air filter paper adopts a coating process that nano coating is coated on air filter base paper, a dispersing agent is adopted to enable single-walled carbon nanotube fibers to be well dispersed in a dispersing agent solution, single-walled carbon nanotube dispersion liquid is prepared, and an adhesive is added, so that the aramid fiber nano air filter paper can be used as a carrier of the single-walled carbon nanotube dispersion liquid while the surface performance of paper is improved in the coating process, the nano coating is well combined with the surface of the paper, and the problem that the filter material is low in filtering precision due to the fact that the stacking density of the single-walled carbon nanotube fibers on the surface of the material is too high.
2. The preparation method of the aramid fiber nano air filter paper provided by the invention can be used for preparing one or more layers of nano coatings on the air filter base paper, and the nano coatings form an interwoven net on the air filter base paper, so that the aperture of the air filter base paper is reduced, and the filtering effect is greatly improved.
3. The invention selects the dispersant and the adhesive with low cost and no pollution.
4. According to the invention, the prepared aramid fiber nano air filter paper has higher mechanical strength by adding the adhesive, coating the aramid fiber nano air filter paper on filter paper and carrying out high-temperature curing treatment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of steps of a preparation method of the aramid nano air filter paper.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the embodiment provides a preparation method of aramid nano air filter paper, which includes the following steps:
s1) preparing air filtering base paper;
s2), preparing single-walled carbon nanotube dispersion liquid, adding an adhesive and water into the single-walled carbon nanotube dispersion liquid, and stirring to obtain the nano coating;
s3) coating the nano coating on the surface of the air filter base paper, and drying to obtain the aramid nano air filter paper.
Specifically, the preparation process of the single-walled carbon nanotube dispersion liquid comprises the following steps: adding a dispersant into water to prepare a dispersant aqueous solution; and adding the single-walled carbon nanotube into a dispersant aqueous solution, and performing ultrasonic dispersion under the ice-water bath condition to prepare the single-walled carbon nanotube dispersion liquid.
Specifically, the mass fraction of the single-walled carbon nanotubes in the single-walled carbon nanotube dispersion liquid is 0.01-0.05%.
Specifically, the diameter of the single-walled carbon nanotube fiber is 1-2 nm; the length of the single-walled carbon nanotube fiber is 5-30 μm.
Specifically, the mass fraction of the dispersant in the dispersant aqueous solution is 0.01-1%.
Specifically, the dispersing agent comprises at least one of nano cellulose fiber, sodium dodecyl sulfate or sodium dodecyl benzene sulfonate; when the dispersant is nano cellulose fibers, the mass fraction of the dispersant in the dispersant aqueous solution is 0.05-0.2%; when the dispersant is sodium dodecyl sulfate or sodium dodecyl benzene sulfonate, the mass fraction of the dispersant in the dispersant aqueous solution is 0.01-1.0%.
Specifically, the mass ratio of the adhesive to the single-walled carbon nanotube dispersion liquid is 1: 0.04-0.68; the adhesive is acrylic emulsion or styrene-acrylic emulsion; the solid content of the prepared nano coating is 10-20%.
Specifically, the coating amount of the nano coating is 5-30% of the oven dry amount of the coated air filter paper.
Specifically, the preparation process of the air filtering base paper comprises the following steps: mixing softwood pulp, hardwood pulp, mercerized softwood pulp and para-aramid pulp fiber according to a proportion, dehydrating and drying in vacuum to obtain the air filter base paper.
Specifically, the length of the softwood pulp fiber is 1.5-3.5mm, and the diameter of the softwood pulp fiber is 30.3-35.6 μm; the length of the hardwood pulp fiber is 0.6-1.3mm, and the diameter of the hardwood pulp fiber is 18.3-27.2 μm; the length of the mercerized softwood pulp fiber is 0.8-1.9mm, and the diameter of the mercerized softwood pulp fiber is 29.3-34.2 mu m; the length of the para-aramid pulp fiber is 0.3-2.5mm, and the diameter of the para-aramid pulp fiber is 10.3-17.2 mu m; the diameter of the single-walled carbon nanotube fiber is 1-2nm, and the diameter of the single-walled carbon nanotube fiber is 5-30 μm.
Specifically, the basis weight of the air filter base paper is 90-100g/m2。
Specifically, at least one layer of nano coating is coated on the air filter base paper.
The invention also discloses aramid nano air filter paper prepared by the preparation method of the aramid nano air filter paper.
The coating process is adopted, the nano coating is coated on the air filter base paper, the single-walled carbon nanotube fibers are well dispersed in a dispersing agent solution by adopting the dispersing agent to prepare the single-walled carbon nanotube dispersing liquid, and the single-walled carbon nanotube dispersing liquid can be used as a carrier of the single-walled carbon nanotube dispersing liquid while the surface performance of the paper is improved in the coating process by adding the adhesive, so that the nano coating is well combined with the surface of the paper, and the problem of low filtering precision of the filter material caused by too high stacking density of the single-walled carbon nanotube fibers on the surface of the material can be solved.
In addition to the above, examples are further illustrated.
Example one
The length of the softwood pulp fiber is 1.5-3.5mm, and the diameter of the softwood pulp fiber is 30.3-35.6 mu m; the length of the hardwood pulp fiber is 0.6-1.3mm, and the diameter of the hardwood pulp fiber is 18.3-27.2 μm; the length of the mercerized softwood pulp fiber is 0.8-1.9mm, and the diameter of the mercerized softwood pulp fiber is 29.3-34.2 mu m; the length of the para-aramid pulp fiber is 0.3-2.5mm, and the diameter of the para-aramid pulp fiber is 10.3-17.2 mu m; the diameter of the single-walled carbon nanotube fiber is 1-2nm, and the diameter of the single-walled carbon nanotube fiber is 5-30 μm; the dispersant is nanocellulose filaments, the diameter of the nanocellulose filaments is 10-20nm, the length of the nanocellulose filaments is 5-10 microns, and the used adhesive is acrylic emulsion with the solid content of 45.5%.
Mixing 25-degree SR softwood pulp fiber, 26-degree SR hardwood pulp fiber, 15-degree SR mercerized softwood pulp fiber and 35-degree SR para-aramid pulp fiber according to the mass ratio of 5:3:2:1, fluffing, dehydrating and drying to obtain air filter base paper, wherein the air filter base paper is quantified to 92g/m2(ii) a Adding nano cellulose fibers into water to prepare nano cellulose fiber gel with the mass fraction of 0.2%, adding single-walled carbon nanotube fibers into the nano cellulose fiber gel with the mass fraction of 0.2%, and performing ultrasonic treatment for 20min under 400W by using an ultrasonic cell disruptor in an ice water bath to prepare single-walled carbon nanotube dispersion liquid, wherein the mass fraction of the single-walled carbon nanotube fibers in the single-walled carbon nanotube dispersion liquid is 0.02%; adding acrylic emulsion and water into the single-walled carbon nanotube dispersion liquid, wherein the mass ratio of the acrylic emulsion to the single-walled carbon nanotube dispersion liquid is 1:0.26, and stirring uniformly to prepare a nano coating, wherein the solid content in the nano coating is 10%; coating the prepared nano coating on the surface of air filter base paper by adopting an infrared drying integrated roller type coating machine, wherein the coating weight of the nano coating is 6 percent relative to the absolute dry weight of coated filter paper, drying is carried out at the drying temperature of 100 ℃ for 3min, and the aramid nano hollow paper is preparedAir filter paper.
The prepared aramid fiber nano air filter paper has the quantitative aramid fiber nano air filter paper of 97.87g/m2Under a filtering system with the wind speed of 11.1cm/s, the grain size in the air is larger than 0.1 mu m; the filtration efficiency of the particle size particles is 99.92%; the filtration resistance is 138.72 Pa; the dust holding capacity is 120g/m2The filter paper had a tensile strength of 2.67kN/m, a bursting strength of 167kPa, and an air permeability of 65mm · s-1。
Example two
The length of the softwood pulp fiber is 1.5-3.5mm, and the diameter of the softwood pulp fiber is 30.3-35.6 mu m; the length of the hardwood pulp fiber is 0.6-1.3mm, and the diameter of the hardwood pulp fiber is 18.3-27.2 μm; the length of the mercerized softwood pulp fiber is 0.8-1.9mm, and the diameter of the mercerized softwood pulp fiber is 29.3-34.2 mu m; the length of the para-aramid pulp fiber is 0.3-2.5mm, and the diameter of the para-aramid pulp fiber is 10.3-17.2 mu m; the diameter of the single-walled carbon nanotube fiber is 1-2nm, and the diameter of the single-walled carbon nanotube fiber is 5-30 μm; the dispersant is sodium dodecyl sulfate, the adhesive is acrylic emulsion, and the solid content of the acrylic emulsion is 45.5%.
Mixing 25-degree SR softwood pulp fiber, 26-degree SR hardwood pulp fiber, 15-degree SR mercerized softwood pulp fiber and 35-degree SR para-aramid pulp fiber according to the mass ratio of 5:3:2:1.5, fluffing, dehydrating and drying to obtain air filter base paper, wherein the air filter base paper is quantitative to 90g/m2(ii) a Adding sodium dodecyl sulfate into water to prepare a sodium dodecyl sulfate solution with the mass fraction of 1%, adding single-walled carbon nanotube fibers, performing ultrasonic treatment for 20min at 400W by using an ultrasonic cell disruptor under the condition of ice water bath to prepare a single-walled carbon nanotube dispersion liquid with the mass fraction of 0.02% of single-walled carbon nanotubes, adding acrylic emulsion and water, and uniformly stirring to prepare the nano coating; the solid content of the prepared nano coating is 10%, and the mass ratio of the acrylic emulsion to the single-walled carbon nanotube dispersion liquid is 1: 0.61; and coating the prepared nano coating on air filter base paper, wherein the coating weight of the nano coating is 10% of the absolute dry weight of the coated filter paper, and drying to obtain the aramid nano air filter paper, wherein the drying temperature is 100 ℃, and the drying time is 3 min.
The aramid fiber nano air filter paper has the quantitative rate of 100g/m2Under the condition of a filtering system with the wind speed of 11.1cm/s, the filtering efficiency of the filter on particles with the particle size of more than 0.1 mu m in air is 99.93 percent, the filtering resistance is 140Pa, and the dust holding capacity is 120g/m2The filter paper had a tensile strength of 3.01kN/m, a bursting strength of 165kPa, and an air permeability of 70mm · s-1。
EXAMPLE III
The length of the softwood pulp fiber is 1.5-3.5mm, and the diameter of the softwood pulp fiber is 30.3-35.6 mu m; the length of the hardwood pulp fiber is 0.6-1.3mm, and the diameter of the hardwood pulp fiber is 18.3-27.2 μm; the length of the mercerized softwood pulp fiber is 0.8-1.9mm, and the diameter of the mercerized softwood pulp fiber is 29.3-34.2 mu m; the length of the para-aramid pulp fiber is 0.3-2.5mm, and the diameter of the para-aramid pulp fiber is 10.3-17.2 mu m; the diameter of the single-walled carbon nanotube fiber is 1-2nm, and the diameter of the single-walled carbon nanotube fiber is 5-30 μm; the dispersant is nanometer cellulose fiber with diameter of 10-20nm and length of 5-10 μm, and the adhesive is styrene-acrylic emulsion with solid content of 44.5%.
Mixing 25-degree SR softwood pulp fiber, 26-degree SR hardwood pulp fiber, 15-degree SR mercerized softwood pulp fiber and 35-degree SR para-aramid pulp fiber according to the mass ratio of 5:3:2:0.5, fluffing, dehydrating and drying to obtain air filter base paper, wherein the air filter base paper is 93g/m in quantitative2(ii) a Adding nano cellulose fibers into water to prepare nano cellulose fiber gel with the mass fraction of 0.28%, adding single-walled carbon nanotube fibers into the nano cellulose fiber gel with the mass fraction of 0.28%, performing ultrasonic treatment for 20min under 400W by using an ultrasonic cell crusher in ice water bath to prepare single-walled carbon nanotube dispersion liquid with the mass fraction of the single-walled carbon nanotube fibers of 0.05%, adding styrene-acrylic emulsion and water, wherein the mass ratio of the styrene-acrylic emulsion to the single-walled carbon nanotube dispersion liquid is 1:0.33, uniformly stirring to prepare nano coating, and the solid content in the nano coating is 20%; coating the prepared nano coating on the surface of air filter base paper by adopting an infrared drying integrated roller coater, wherein the coating amount is 15 percent relative to the absolute dry amount of the coated filter paper, and drying at the drying temperature ofDrying for 3min at 100 ℃ to prepare the aramid nano air filter paper.
The quantitative amount of the aramid fiber nano air filter paper is 109.4g/m2Under the condition of a filtering system with the wind speed of 11.1cm/s, the filtering efficiency of the air on particles with the particle size of more than 0.1 mu m is 99.93 percent, the filtering resistance is 138Pa, and the dust holding capacity is 121g/m2The filter paper had a tensile strength of 2.52kN/m, a burst strength of 165kPa, and an air permeability of 68mm · s-1。
The preparation method of the aramid fiber nano air filter paper adopts a coating process that nano coating is coated on air filter base paper, a dispersing agent is adopted to enable single-walled carbon nanotube fibers to be well dispersed in a dispersing agent solution, single-walled carbon nanotube dispersion liquid is prepared, and an adhesive is added, so that the aramid fiber nano air filter paper can be used as a carrier of the single-walled carbon nanotube dispersion liquid while the surface performance of paper is improved in the coating process, the nano coating is well combined with the surface of the paper, and the problem that the filter material is low in filtering precision due to the fact that the stacking density of the single-walled carbon nanotube fibers on the surface of the material is too high.
Secondly, the preparation method of the aramid fiber nano air filter paper provided by the invention can be used for preparing one or more layers of nano coatings on the air filter base paper, and the nano coatings form an interwoven net on the air filter base paper, so that the aperture of the air filter base paper is reduced, and the filtering effect is greatly improved.
Thirdly, the invention selects the dispersant and the adhesive with low cost and no pollution.
Fourthly, the aramid fiber nano air filter paper is coated on filter paper by adding an adhesive and is subjected to high-temperature curing treatment, so that the prepared aramid fiber nano air filter paper has high mechanical strength.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A preparation method of aramid fiber nano air filter paper is characterized by comprising the following steps: the method comprises the following steps:
preparing air filtering base paper;
preparing single-walled carbon nanotube dispersion liquid, adding an adhesive and water into the single-walled carbon nanotube dispersion liquid, and stirring to obtain a nano coating;
and coating the nano coating on the surface of the air filtering base paper, and drying to obtain the aramid nano air filtering paper.
2. The preparation method of the aramid nano air filter paper according to claim 1, characterized by comprising the following steps: the preparation process of the single-walled carbon nanotube dispersion liquid comprises the following steps: adding a dispersant into water to prepare a dispersant aqueous solution; and adding the single-walled carbon nanotube into a dispersant aqueous solution, and performing ultrasonic dispersion under the ice-water bath condition to prepare the single-walled carbon nanotube dispersion liquid.
3. The preparation method of the aramid nano air filter paper according to claim 2, characterized by comprising the following steps: the mass fraction of the single-walled carbon nanotubes in the single-walled carbon nanotube dispersion liquid is 0.01-0.05%.
4. The preparation method of the aramid nano air filter paper as claimed in claim 3, characterized in that: the diameter of the single-walled carbon nanotube fiber is 1-2 nm; the length of the single-walled carbon nanotube fiber is 5-30 μm.
5. The preparation method of the aramid nano air filter paper according to claim 4, characterized by comprising the following steps: in the dispersant water solution, the mass fraction of the dispersant is 0.01-1.0%.
6. The preparation method of the aramid nano air filter paper according to claim 5, characterized by comprising the following steps: the dispersing agent comprises at least one of nano cellulose fiber, sodium dodecyl sulfate or sodium dodecyl benzene sulfonate; when the dispersant is nano cellulose fibers, the mass fraction of the dispersant in the dispersant aqueous solution is 0.05-0.2%; when the dispersant is sodium dodecyl sulfate or sodium dodecyl benzene sulfonate, the mass fraction of the dispersant in the dispersant aqueous solution is 0.01-1.0%.
7. The preparation method of the aramid nano air filter paper as claimed in claim 6, characterized in that: the mass ratio of the adhesive to the single-walled carbon nanotube dispersion liquid is 1: 0.04-0.68; the adhesive is acrylic emulsion or styrene-acrylic emulsion; the solid content of the prepared nano coating is 10-20%.
8. The preparation method of the aramid nano air filter paper as claimed in claim 7, wherein the preparation method comprises the following steps: the coating weight of the nano coating is 5-30% of the oven dry weight of the coated air filter paper.
9. The preparation method of the aramid nano air filter paper as claimed in claim 8, wherein the preparation method comprises the following steps: the preparation process of the air filtering base paper comprises the following steps: mixing softwood pulp, hardwood pulp, mercerized softwood pulp and para-aramid pulp fiber according to a proportion, dehydrating and drying in vacuum to obtain the air filter base paper.
10. Aramid nano air filter paper prepared based on the aramid nano air filter paper preparation method of any one of claims 1 to 9.
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