CN108823969B - Carbon nanotube far infrared non-woven fabric and preparation method thereof - Google Patents
Carbon nanotube far infrared non-woven fabric and preparation method thereof Download PDFInfo
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- CN108823969B CN108823969B CN201810736296.1A CN201810736296A CN108823969B CN 108823969 B CN108823969 B CN 108823969B CN 201810736296 A CN201810736296 A CN 201810736296A CN 108823969 B CN108823969 B CN 108823969B
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
- D06M11/74—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon or graphite; with carbides; with graphitic acids or their salts
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- 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
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
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- Textile Engineering (AREA)
- Paper (AREA)
- Nonwoven Fabrics (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
The invention provides a preparation method of a carbon nano tube far infrared non-woven fabric. According to the invention, the carbon nano tubes and the paper fibers are used as raw materials to be compounded to be made into the whole non-woven fabric again, specifically, the paper fibers are subjected to inclined net forming and vacuum water absorption treatment to form a non-woven fabric precursor with a grid structure, ethanol-water dispersion of the carbon nano tubes is coated on the surface of the non-woven fabric precursor, the carbon nano tubes are filled into the grid structure of the non-woven fabric precursor, and the carbon nano tubes are tightly combined with the non-woven fabric precursor through hot press forming, so that the obtained carbon nano tube far infrared non-woven fabric has better forming quality and composite performance. The experimental result of the embodiment shows that the carbon nanotube far infrared non-woven fabric provided by the invention has a far infrared emissivity of 90%, can bear a weight of 300g and cannot be broken. The carbon nano tube far infrared non-woven fabric provided by the invention has excellent far infrared emissivity and mechanical property.
Description
Technical Field
The invention relates to the technical field of far infrared emission materials, in particular to a carbon nanotube far infrared non-woven fabric and a preparation method thereof.
Background
The far infrared ray is a light wave in the infrared wavelength range, the wavelength of the light wave is within the range of 3-100 μm, and the light wave is usually not perceived by people, however, the far infrared ray has a very important effect on life bodies, and after the human body absorbs the far infrared ray, the body temperature rises, the capillary vessels expand, and the blood circulation is active, so that the metabolism of the human body and the operation of the human body are enhanced. The excellent properties of far infrared rays make their applications in the fields of life sciences and bio-medical treatment increasingly widespread. At present, only a small number of devices capable of emitting far infrared rays exist, but due to the limitation of the nature of the materials used for emitting far infrared rays, the far infrared rays emitted by the devices have more clutters and low far infrared emissivity.
The carbon nano tube is a novel material as a far infrared radiation source, has good physical and chemical properties, can emit far infrared rays with a proportion of more than 90 percent, and is an ideal material for emitting the far infrared rays. At present, carbon nanotubes are generally coated on a finished film (such as a plastic film) to emit far infrared rays, the formed carbon nanotube layer and the finished film are simply laminated and compounded, and the compound position between the two materials generates large energy loss and cannot fully exert the characteristics of the materials. Therefore, the composite material obtained by the method has low far infrared emissivity, and further application of the composite material is severely restricted.
Disclosure of Invention
The invention aims to provide a carbon nanotube far infrared non-woven fabric and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a carbon nano tube far infrared non-woven fabric, which comprises the following steps:
(1) mixing paper fibers, water and a dispersing agent, and then sequentially carrying out ultrasonic treatment and pulping treatment to obtain paper fiber slurry;
(2) sequentially carrying out inclined net forming and vacuum water absorption treatment on the paper fiber slurry in the step (1) to obtain a non-woven fabric precursor;
(3) and (3) coating the ethanol-water dispersion of the carbon nano tube on the surface of the non-woven fabric precursor in the step (2), and drying and hot-press forming the non-woven fabric precursor in sequence to obtain the carbon nano tube far infrared non-woven fabric.
Preferably, the mass ratio of the paper fibers in the step (1) to the carbon nanotubes in the step (3) is 1: (0.8 to 1.2).
Preferably, the diameter of the paper fiber in the step (1) is 12-18 μm.
Preferably, the vacuum water absorption treatment in the step (2) is carried out under the condition that the vacuum degree is 8000 +/-1300 Pa.
Preferably, the carbon nanotubes in step (3) are whisker-shaped multi-wall carbon nanotubes.
Preferably, the mass concentration of the carbon nanotubes in the ethanol-water dispersion of the carbon nanotubes in the step (3) is 0.5-2.5%, and the coating amount of the ethanol-water dispersion of the carbon nanotubes on the surface of the non-woven fabric precursor is 0.1-2 m L/cm2。
Preferably, the temperature of the hot-press molding in the step (3) is 200-300 ℃, the pressure is 8-12 MPa, and the time is 20-60 min.
Preferably, the number of hot press molding in the step (3) is 2-4.
The invention provides the carbon nano tube far infrared non-woven fabric prepared by the preparation method in the technical scheme, which is prepared from raw materials comprising paper fibers and carbon nano tubes, wherein the paper fibers form a cloth-shaped object with a network structure, and the carbon nano tubes are filled in the network structure of the cloth-shaped object.
Preferably, the thickness of the carbon nanotube far infrared non-woven fabric is 0.25-0.35 mm.
The invention provides a preparation method of a carbon nanotube far infrared non-woven fabric, which comprises the steps of mixing paper fibers, water and a dispersing agent, and then sequentially carrying out ultrasonic treatment and pulping treatment to obtain paper fiber slurry; sequentially carrying out inclined net forming and vacuum water absorption treatment on the paper fiber slurry to obtain a non-woven fabric precursor; and coating the ethanol-water dispersion of the carbon nano tube on the surface of the non-woven fabric precursor, and sequentially drying and hot-press forming to obtain the carbon nano tube far infrared non-woven fabric. The carbon nanotube and paper fiber are used as raw materials to be compounded to be made into the whole non-woven fabric again, specifically, the paper fiber can form a non-woven fabric precursor with a grid structure through inclined net forming and vacuum water absorption treatment, ethanol-water dispersion of the carbon nanotube is coated on the surface of the non-woven fabric precursor, the carbon nanotube can be filled into the grid structure of the non-woven fabric precursor, and the carbon nanotube can be tightly combined with the non-woven fabric precursor through hot press forming, so that the obtained carbon nanotube far infrared non-woven fabric has better forming quality and composite performance, and can be used for heating seat cushions of high-speed rails, airplanes, cars and the like. The experimental result of the embodiment shows that the carbon nanotube far infrared non-woven fabric provided by the invention has a far infrared emissivity of 90%, can bear a weight of 300g and cannot be broken. The carbon nano tube far infrared non-woven fabric provided by the invention has excellent far infrared emissivity and mechanical property.
In addition, the preparation method provided by the invention is simple to operate and convenient for large-scale production.
Detailed Description
The invention provides a preparation method of a carbon nano tube far infrared non-woven fabric, which comprises the following steps:
(1) mixing paper fibers, water and a dispersing agent, and then sequentially carrying out ultrasonic treatment and pulping treatment to obtain paper fiber slurry;
(2) sequentially carrying out inclined net forming and vacuum water absorption treatment on the paper fiber slurry in the step (1) to obtain a non-woven fabric precursor;
(3) and (3) coating the ethanol-water dispersion of the carbon nano tube on the surface of the non-woven fabric precursor in the step (2), and drying and hot-press forming the non-woven fabric precursor in sequence to obtain the carbon nano tube far infrared non-woven fabric.
The method comprises the steps of mixing paper fibers, water and a dispersing agent, and then sequentially carrying out ultrasonic treatment and beating treatment to obtain paper fiber slurry, wherein the diameter of the paper fibers is preferably 12-18 mu m, more preferably 15 mu m, the type of the paper fibers is not particularly limited, and the paper fibers are well known to a person skilled in the art, such as wood fibers, the source of the paper fibers is not particularly limited, and the paper fibers are commercially available, such as the person skilled in the art, the mass ratio of the paper fibers to the dispersing agent to the volume of the water is preferably (2-5) g, (0.02-0.05) g, (400-700) m L, the dispersing agent is not particularly limited, and the dispersing agent is well known to the person skilled in the art, such as sodium dodecyl benzene sulfonate, polyvinylpyrrolidone (PVP), polyethylene oxide (PEO) or polyvinyl alcohol (PVA).
The invention preferably mixes the paper fiber, partial water and the dispersant and then carries out ultrasonic treatment, and then carries out pulping treatment after mixing the obtained material and the rest water. In the present invention, the volume ratio of the partial water to the remaining water is preferably 1: (2-3).
In the invention, the time of ultrasonic treatment is preferably 10-30 min; the power is preferably 150-250W. The invention has no special limitation on the pulping treatment, and the technical scheme of the pulping treatment well known to the technical personnel in the field can be adopted; in the invention, the beating degree in the beating process is preferably 40-55 DEG SR, and more preferably 45-50 DEG SR.
After the paper fiber pulp is obtained, the paper fiber pulp is sequentially subjected to inclined net forming and vacuum water absorption treatment to obtain the non-woven fabric precursor with the grid structure. The inclined wire forming is not specially limited, and the technical scheme of inclined wire forming known to those skilled in the art can be adopted; in the embodiment of the invention, the paper making and forming are carried out on a slant wire paper machine. In the present invention, the vacuum water absorption treatment is preferably performed under a vacuum degree of 8000. + -.1300 Pa. In the present invention, the vacuum water absorption treatment preferably includes the steps of:
placing the formed material obtained by inclined net forming in a dryer of a vacuum water absorption instrument, adjusting a vacuum pressure gauge by using a pressure regulating valve when the vacuum degree reaches 8000 +/-1300 Pa, stabilizing the vacuum degree, opening a water injection valve after 8-12 min, injecting water in a water storage bottle into the dryer, and keeping the water temperature in the dryer to be 35 +/-2 ℃; and when the water surface is over 20mm above the upper end of the forming material, closing the water injection valve and the vacuum pump, and taking out after 45-55 min to obtain the non-woven fabric precursor with the grid structure.
After the non-woven fabric precursor is obtained, the ethanol-water dispersion of the carbon nano tube is coated on the surface of the non-woven fabric precursor, and drying and hot-press forming are sequentially carried out to obtain the carbon nano tube far infrared non-woven fabric. In the present invention, the mass ratio of the paper fiber to the carbon nanotube is preferably 1: (0.8 to 1.2), more preferably 1: 1.
the carbon nanotubes are preferably Whisker-shaped multi-wall carbon nanotubes, the length of the carbon nanotubes is preferably 2-5 micrometers, the diameter of the carbon nanotubes is preferably 30-150 nm, the carbon nanotubes are preferably prepared according to a method disclosed in the literature (Sun X G, Qiu Z W, Chen L, et al, Industrial synthesis of Whisker carbonnantotes [ C ]// Materials Science for Trans Tech Publications L td.,2016,852:514), the carbon nanotubes are prepared according to the method, the mass concentration of the carbon nanotubes in an ethanol-water dispersion of the carbon nanotubes is preferably 0.5-2.5%, more preferably 1-2%, the volume ratio of ethanol to water is preferably 1 (10-50), more preferably 1-20-40), the method is not limited to a special method for preparing the ethanol-water dispersion of the carbon nanotubes, the method is preferably not limited to a special material, the method is preferably not limited to a material, the method is not limited to a special material, the method is preferably limited to a material, the method is not limited to a material, the method is preferably limited to a material for preparing the ethanol-water dispersion, the method is preferably limited to a material-water dispersion method, the method for preparing the ethanol-water dispersion of the invention, the method is preferably limited to a material-water dispersion, the method for preparing an ethanol-water dispersion, the method is preferably to a material-water dispersion method for a special material-water dispersion, the method for mixing method is preferably to a special material-water dispersion, the method for preparing method for the method for mixing, the method is preferably to a special material-water dispersion of the invention, the method is preferably to a method for the ultrasonic treatment, the ultrasonic treatment is preferably to the ultrasonic treatment, the ultrasonic treatment is preferably to the ultrasonic.
The coating is not particularly limited, and the coating method may be a coating method known to those skilled in the art, and the ethanol-water dispersion of the carbon nanotubes is preferably applied to the surface of the nonwoven fabric precursor by using a roller, and the coating amount of the ethanol-water dispersion of the carbon nanotubes on the surface of the nonwoven fabric precursor is preferably 0.1 to 2m L/cm2More preferably 0.2 to 0.1m L/cm2Most preferably 0.3 to 0.5m L/cm2。
In the invention, the drying temperature is preferably 120-145 ℃, and more preferably 135 ℃; the invention preferably dries the non-woven fabric precursor coated with the ethanol-water dispersion of the carbon nano tube by passing the non-woven fabric precursor through an oven with the length of 1m at the speed of 15-25 m/min.
In the invention, the hot-press forming temperature is preferably 200-300 ℃, and more preferably 250 ℃; the pressure is preferably 8-12 MPa, and more preferably 10 MPa; the time is preferably 20-60 min, and more preferably 40 min. In the present invention, the number of times of the hot press forming is preferably 2 to 4 times, and more preferably 3 times.
According to the invention, the paper fiber is subjected to inclined net forming and vacuum water absorption treatment to form a non-woven fabric precursor with a grid structure, the ethanol-water dispersion of the carbon nano tubes is coated on the surface of the non-woven fabric precursor, the carbon nano tubes are filled into the grid structure of the non-woven fabric precursor, and the carbon nano tubes are tightly combined with the non-woven fabric precursor through hot press forming, so that the obtained carbon nano tube far infrared non-woven fabric has better forming quality and composite performance.
The invention provides the carbon nano tube far infrared non-woven fabric prepared by the preparation method in the technical scheme, which is prepared from raw materials comprising paper fibers and carbon nano tubes, wherein the paper fibers form a cloth-shaped object with a network structure, and the carbon nano tubes are filled in the network structure of the cloth-shaped object. In the invention, the thickness of the carbon nano tube far infrared non-woven fabric is preferably 25-35 mm, and more preferably 30 mm.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the 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.
Example 1
Mixing 2g of paper fibers (the diameter is 15 mu m), 0.02g of sodium dodecyl benzene sulfonate and 100m of L water, carrying out ultrasonic treatment for 10min under the condition of 200W, mixing the obtained material with 300m of L water, carrying out pulping treatment, and controlling the pulping degree to be 40 DEG SR to obtain paper fiber pulp;
making and molding the paper fiber slurry on an inclined wire paper machine, then placing the obtained molding material in a dryer of a vacuum water absorption instrument, adjusting a vacuum pressure gauge by using a pressure regulating valve when the vacuum degree reaches 8000 +/-1300 Pa, stabilizing the vacuum degree, opening a water injection valve after 10min, injecting water in a water storage bottle into the dryer, and keeping the water temperature in the dryer to be 35 +/-2 ℃; when the water surface is over 20mm above the upper end of the molding material, closing the water injection valve and the vacuum pump, and taking out after 50min to obtain a non-woven fabric precursor;
mixing 2g of whisker-shaped multi-walled carbon nanotubes (the length is 2-5 mu m, the diameter is 30-150 nm) with 10m L ethanol and 200m L water, stirring, performing ultrasonic treatment for 10min, and finally performing shearing treatment for 10min under the condition of 1000r/min to obtain ethanol-water dispersion of the carbon nanotubes;
and (2) coating the ethanol-water dispersion of the carbon nano tube on the surface of the non-woven fabric precursor by adopting a roller, drying the non-woven fabric precursor by using an oven with the length of 1m and the temperature of 120 ℃ at the speed of 15m/min, then carrying out hot press molding for 20min under the conditions of 10MPa and 200 ℃, and continuously repeating hot press for 2 times to obtain the carbon nano tube far infrared non-woven fabric.
The thermal infrared imager is used for testing the far infrared emissivity of the carbon nanotube far infrared non-woven fabric prepared by the embodiment, and the result shows that the far infrared emissivity of the carbon nanotube far infrared non-woven fabric reaches 90%; the weight was hung below the carbon nanotube far infrared non-woven fabric prepared in this example to test the strength thereof, and it was found that the carbon nanotube far infrared non-woven fabric can withstand the weight of 300g and is not broken. The carbon nano tube far infrared non-woven fabric provided by the invention has good far infrared emissivity and mechanical property.
Example 2
Mixing 3g of paper fiber (the diameter is 15 mu m), 0.03g of sodium dodecyl benzene sulfonate and 200m of L water, carrying out ultrasonic treatment for 20min under the condition of 200W, mixing the obtained material with 400m of L water, carrying out pulping treatment, and controlling the pulping degree to be 45 DEG SR to obtain paper fiber pulp;
making and molding the paper fiber slurry on an inclined wire paper machine, then placing the obtained molding material in a dryer of a vacuum water absorption instrument, adjusting a vacuum pressure gauge by using a pressure regulating valve when the vacuum degree reaches 8000 +/-1300 Pa, stabilizing the vacuum degree, opening a water injection valve after 10min, injecting water in a water storage bottle into the dryer, and keeping the water temperature in the dryer to be 35 +/-2 ℃; when the water surface is over 20mm above the upper end of the molding material, closing the water injection valve and the vacuum pump, and taking out after 50min to obtain a non-woven fabric precursor;
mixing 3g of whisker-shaped multi-walled carbon nanotubes (the length is 2-5 mu m, the diameter is 30-150 nm) with 10m L ethanol and 400m L water, stirring, performing ultrasonic treatment for 20min, and finally performing shearing treatment for 20min under the condition of 2000r/min to obtain ethanol-water dispersion of the carbon nanotubes;
and (2) coating the ethanol-water dispersion of the carbon nano tube on the surface of the non-woven fabric precursor by adopting a roller, drying the non-woven fabric precursor by passing through an oven with the length of 1 and the temperature of 135 ℃ at the speed of 20m/min, then carrying out hot press molding for 40min under the conditions of 10MPa and 300 ℃, and continuously repeating the hot press for 2 times to obtain the carbon nano tube far infrared non-woven fabric.
The carbon nanotube far infrared nonwoven fabric prepared in this example was tested for far infrared emissivity and mechanical properties according to the method of example 1, and the results were substantially the same as example 1.
Example 3
Mixing 5g of paper fiber (the diameter is 15 mu m), 0.05g of sodium dodecyl benzene sulfonate and 200m of L water, carrying out ultrasonic treatment for 30min under the condition of 200W, mixing the obtained material with 500m of L water, carrying out pulping treatment, and controlling the pulping degree to be 55 DEG SR to obtain paper fiber pulp;
making and molding the paper fiber slurry on an inclined wire paper machine, then placing the obtained molding material in a vacuum water absorption instrument dryer, adjusting a vacuum pressure gauge by using a pressure regulating valve when the vacuum degree reaches 8000 +/-1300 Pa, stabilizing the vacuum degree, opening a water injection valve after 10min, injecting water in a water storage bottle into the dryer, and keeping the water temperature in the dryer to be 35 +/-2 ℃; when the water surface is over 20mm above the upper end of the molding material, closing the water injection valve and the vacuum pump, and taking out after 50min to obtain a non-woven fabric precursor;
mixing 5g of whisker-shaped multi-walled carbon nanotubes (the length is 2-5 mu m, the diameter is 30-150 nm) with 10m L ethanol and 300m L water, stirring, performing ultrasonic treatment for 30min, and finally performing shearing treatment for 30min under the condition of 3000r/min to obtain ethanol-water dispersion of the carbon nanotubes;
and (2) coating the ethanol-water dispersion of the carbon nano tube on the surface of the non-woven fabric precursor by adopting a roller, drying the non-woven fabric precursor by passing through an oven with the length of 1m and the temperature of 145 ℃ at the speed of 25m/min, then carrying out hot press molding for 60min under the conditions of 10MPa and 250 ℃, and continuously repeating the hot press for 2 times to obtain the carbon nano tube far infrared non-woven fabric.
The carbon nanotube far infrared nonwoven fabric prepared in this example was tested for far infrared emissivity and mechanical properties according to the method of example 1, and the results were substantially the same as example 1.
According to the embodiments, the carbon nanotube far infrared nonwoven fabric provided by the invention has excellent far infrared emissivity and mechanical properties; in addition, the preparation method provided by the invention is simple to operate and convenient for large-scale production.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A preparation method of carbon nanotube far infrared non-woven fabric comprises the following steps:
(1) mixing paper fibers, water and a dispersing agent, and then sequentially carrying out ultrasonic treatment and pulping treatment to obtain paper fiber slurry;
(2) sequentially carrying out inclined net forming and vacuum water absorption treatment on the paper fiber slurry in the step (1) to obtain a non-woven fabric precursor;
(3) coating the ethanol-water dispersion of the carbon nano tube on the surface of the non-woven fabric precursor in the step (2), and sequentially drying and hot-press forming to obtain the carbon nano tube far infrared non-woven fabric;
the mass ratio of the paper fibers in the step (1) to the carbon nanotubes in the step (3) is 1: (0.8 to 1.2);
the diameter of the paper fiber in the step (1) is 12-18 mu m;
the carbon nano tube in the step (3) is a whisker-shaped multi-wall carbon nano tube, the length of the carbon nano tube is 2-5 mu m, and the diameter of the carbon nano tube is 30-150 nm;
the mass concentration of the carbon nano tubes in the ethanol-water dispersion liquid of the carbon nano tubes in the step (3) is 0.5-2.5%, and the coating amount of the ethanol-water dispersion liquid of the carbon nano tubes on the surface of the non-woven fabric precursor is 0.1-2 m L/cm2。
2. The production method according to claim 1, wherein the vacuum water absorption treatment in the step (2) is performed under a vacuum degree of 8000 ± 1300 Pa.
3. The preparation method according to claim 1, wherein the hot-press molding in the step (3) is performed at a temperature of 200-300 ℃, a pressure of 8-12 MPa, and a time of 20-60 min.
4. The method as claimed in claim 1 or 3, wherein the number of hot press molding in the step (3) is 2 to 4.
5. The carbon nanotube far infrared nonwoven fabric prepared by the preparation method of any one of claims 1 to 4, which is prepared from raw materials comprising paper fibers and carbon nanotubes, wherein the paper fibers form a cloth-like object with a network structure, and the carbon nanotubes are filled in the network structure of the cloth-like object.
6. The carbon nanotube far infrared nonwoven fabric according to claim 5, wherein the thickness of the carbon nanotube far infrared nonwoven fabric is 0.25 to 0.35 mm.
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