CN113832735A - Polylactic acid porous nanofiber-nano phase change capsule composite material and preparation method and application thereof - Google Patents
Polylactic acid porous nanofiber-nano phase change capsule composite material and preparation method and application thereof Download PDFInfo
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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
- D06M23/00—Treatment of fibres, threads, yarns, fabrics or fibrous goods made from such materials, characterised by the process
- D06M23/12—Processes in which the treating agent is incorporated in microcapsules
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/061—Use of materials for tobacco smoke filters containing additives entrapped within capsules, sponge-like material or the like, for further release upon smoking
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/17—Filters specially adapted for simulated smoking devices
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0015—Electro-spinning characterised by the initial state of the material
- D01D5/003—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion
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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
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
- D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
- D01F6/625—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters derived from hydroxy-carboxylic acids, e.g. lactones
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/77—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof
- D06M11/79—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof with silicon dioxide, silicic acids or their salts
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/184—Carboxylic acids; Anhydrides, halides or salts thereof
- D06M13/188—Monocarboxylic acids; Anhydrides, halides or salts thereof
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/32—Polyesters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a polylactic acid porous nanofiber-nano phase change capsule composite material and a preparation method and application thereof, wherein the composite material comprises a polylactic acid porous nanofiber matrix and nano phase change capsules attached to nano pores of the polylactic acid porous nanofiber matrix, and the particle size of the nano phase change capsules is 80-120 nm; the preparation method comprises soaking porous nanometer fiber matrix of polylactic acid in emulsion of nanometer phase change capsule for 15-30min, taking out, and drying to constant weight. The invention can prepare the nano phase change capsule which has high thermal conductivity and high phase change latent heat and is easy to disperse, and the nano phase change capsule is loaded on the polylactic acid porous nano fiber base material, thereby improving the thermal conductivity and the cooling effect of the base material; the method makes full use of the characteristic that the nano-pores can effectively adsorb the organic micromolecules and the embedded nanoparticles, can avoid the defects that the traditional loading method is easy to fall off, the loading process is complex and toxic cross-linking agents can be used, and has excellent application effect.
Description
Technical Field
The invention belongs to the field of composite material science and technology, and particularly relates to a polylactic acid porous nanofiber-nano phase change capsule composite material as well as a preparation method and application thereof.
Background
The cigarette without burning when heated consists of smoking set and cartridge; when in use, the cigarette cartridge is inserted into the smoking set, and the smoking set heats the cigarette cartridge, so that the tobacco in the cigarette cartridge is heated without burning.
The cigarette bullet part for heating the non-burning tobacco is composed of a filter tip section, a cooling section, a blank pipe section and a tobacco section. The temperature of the tobacco section is 160-200 ℃ when the non-burning tobacco is heated and smoked, and the temperature of the filter section near the lip is 30-40 ℃. At present, domestic heating non-combustible tobacco products are in rapid development, but have a plurality of defects and technical problems to be overcome. For example, the smoking taste of domestic non-burning tobacco is slightly light compared with that of the traditional cigarette, the whole length of the cigarette cartridge is short, and the cooling effect of the cooling section is limited, so that the temperature of the filter section near the lip is high.
The nanocapsule is a microcapsule with the particle size of 1-1000 nm; the nano-capsule phase change material is a result of further development of the micro (rice) capsule phase change material, not only retains the technical advantages of the microcapsule (when the microcapsule is formed, the capsule core is coated to be isolated from the external environment, and the property of the microcapsule can be retained without influence), but also makes up for the defects of the common microcapsule phase change material. The capsule size is reduced from micron level to nanometer level, so that the ratio of the surface area to the volume of the capsule is increased, and the heat transfer rate of the phase-change material is favorably improved, so that the application range of the capsule-type phase-change material is further expanded; meanwhile, the damage caused by collision among particles in use can be greatly reduced. Therefore, the research on the nano-capsule phase-change material technology is gradually becoming a hot spot in recent years.
So far, reports related to the application of the nano-capsule phase change material in heating non-burning cigarettes are hardly seen.
In view of this, the present invention is proposed.
Disclosure of Invention
Aiming at the defect of phase change cooling capability of the existing material at the cooling section of the cigarette which is not heated and combusted, the invention provides a polylactic acid porous nanofiber-nano phase change capsule composite material and a preparation method and application thereof.
According to one aspect of the invention, the polylactic acid porous nanofiber-nano phase change capsule composite material comprises a polylactic acid porous nanofiber matrix and nano phase change capsules attached to nano pores of the polylactic acid porous nanofiber matrix, wherein the porosity coverage rate of the polylactic acid porous nanofiber matrix is 15-30%, the average pore size is 180-280nm, and the particle size of the nano phase change capsules is 80-120 nm.
In the technical scheme, the polylactic acid porous nanofiber matrix is prepared by an electrostatic spinning method, and the method comprises the following specific steps:
and dissolving polylactic acid particles in a mixed solvent of dichloromethane and N, N-dimethylacetamide, uniformly mixing, and performing electrostatic spinning by using the uniformly mixed solution as a spinning solution to obtain the polylactic acid porous nanofiber matrix.
Further, in the above technical scheme, in the preparation process of the polylactic acid porous nanofiber matrix, the mass fraction of the polylactic acid in the spinning solution is 5-12%.
In particular, the concentration of polylactic acid influences the result of electrostatic spinning to a large extent; when the concentration of the polylactic acid is too low, the entanglement degree of molecular chains in the spinning solution is too small, jet flow is easy to form a spherical object and cannot be fully drawn in the electrostatic spinning process, and meanwhile, the jet flow with lower viscosity is easier to draw and thin, so that pores are easier to be drawn and even drawn until the pores are closed, and further, the pores in the polylactic acid fiber are greatly reduced; when the concentration of the polylactic acid is too high, the viscosity of the spinning solution is too high, which is not beneficial to the formation of polylactic acid jet flow and the stretching of fibers in the electrostatic spinning process.
Further, in the above technical scheme, in the preparation process of the polylactic acid porous nanofiber matrix, in the mixed solvent, the mass ratio of dichloromethane to N, N dimethylacetamide is 5-10: 1.
specifically, the pore structure of the surface of the polylactic acid porous nanofiber matrix is greatly influenced by the mass ratio of dichloromethane/N, N-dimethylacetamide. In detail, dichloromethane has a higher vapor pressure, when the content of dichloromethane in the mixed solvent is less, the volatilization rate of the solvent on the surface of the jet flow in the electrostatic spinning process is relatively slow, and the reduction rate and the amplitude of the temperature on the surface of the jet flow are relatively small; for the polylactic acid porous nanofiber which relies on rapid solvent volatilization and temperature change as a pore-forming mechanism, the pore density and the pore width of the surface of the polylactic acid porous nanofiber are relatively reduced.
Further, in the above technical scheme, in the preparation process of the polylactic acid porous nanofiber matrix, the spinning voltage is 10-20 kV.
Further, in the above technical scheme, in the preparation process of the polylactic acid porous nanofiber matrix, the flow rate of the spinning solution is 1-2 ml/h.
In the technical scheme, the nano phase change capsule is of a nano composite structure with hexadecanoic acid as a core and silicon dioxide as a shell.
Preferably, in the above technical scheme, the nano phase change capsule is prepared by a fine emulsion method assisted by a sol-gel method, and specifically includes:
and (3) dropwise adding the silica sol into the hexadecanoic acid miniemulsion, stirring for 4-8h at the temperature of 65-80 ℃, and cooling to normal temperature to obtain the emulsion of the nano phase change capsule.
In detail, the nano phase change capsule takes liquid with high phase change latent heat as a core material, and the wall material with a compact structure wraps around the phase change material to prevent the phase change material from leaking and changing volume in the phase change process, and meanwhile, the heat exchange performance of the phase change material is greatly improved by introducing the wall material with high heat conductivity (such as silicon dioxide); compared with the common micron capsule, the prepared nano phase change capsule has the advantages of smaller size, larger surface area, stronger stability, higher high thermal conductivity, higher latent heat of phase change, good dispersibility, easy loading on a base material with a nano pore structure, and great improvement on the thermal conductivity and the latent heat of phase change of the base material.
Further, in the above technical scheme, in the preparation process of the nano phase change capsule, the concentration of the silica sol is 0.01-0.03 g/ml.
In detail, the silicon dioxide has good thermal conductivity, is safe, non-toxic, cheap and cheap, and can greatly improve the thermal conductivity of the capsule when being used as a wall material of the nano phase change capsule. Specifically, when silica is prepared using tetraethyl orthosilicate as a precursor, the particle size and particle size distribution of the sol particles can be controlled relatively easily by controlling the concentration and the catalytic conditions. In addition, the concentration of the silica sol greatly influences the core material packaging effect of the nano phase change capsule, the size, the stability and the thermal conductivity of the nano phase change capsule.
Further, in the above technical solution, in the preparation process of the nano phase change capsule, the concentration of the palmitic acid miniemulsion is 0.09-0.12 g/ml.
In detail, the concentration and the emulsification effect of the palmitic acid miniemulsion directly influence the encapsulation effect, the average particle size and the particle size distribution of the nano phase change capsule; the emulsion is easy to agglomerate due to too high concentration of the hexadecanoic acid miniemulsion, and the encapsulation efficiency of the core material and the yield of the nano phase change capsules are easy to reduce due to too low concentration of the hexadecanoic acid miniemulsion.
Further, in the above technical solution, in the preparation process of the nano phase change capsule, the volume of the added silica sol is 0.6-2.4 times, preferably 1.2 times of the volume of the palmitic acid miniemulsion.
Further, in the above technical solution, in the preparation process of the nano phase change capsule, the stirring speed is 500-800 rpm.
Still further, in the above technical solution, the palmitic acid miniemulsion is prepared by the following method:
adding 9-12g hexadecanoic acid and 0.15-0.22g emulsifier into 100ml water, stirring at the speed of 300-75 ℃ and 1000rpm for 5-20min, and homogenizing at the speed of 7000-15000rpm for 3-15min to obtain the hexadecanoic acid miniemulsion.
Wherein, the emulsifier is preferably sodium dodecyl sulfate.
Still further, in the above technical solution, the silica sol is prepared by the following method:
adding 8-12ml tetraethyl orthosilicate into 90ml absolute ethyl alcohol, uniformly mixing, adding 30ml water, adjusting the pH value to 9-12 by using ammonia water, and stirring for 20-40min to obtain the silicon dioxide sol.
According to another aspect of the present invention, there is provided a method for preparing the above polylactic acid porous nanofiber-nano phase change capsule composite material, comprising,
and (3) putting the polylactic acid porous nanofiber matrix into the emulsion of the nano phase change capsule, soaking for 15-30min, taking out, and drying to constant weight.
In the above technical scheme, the stirring speed is controlled to be 10-60rpm in the dipping process.
According to another aspect of the invention, the polylactic acid porous nanofiber-nano phase change capsule composite material is applied to the preparation of a cooling section for heating non-combustion tobacco.
The invention has the advantages that:
(1) the method provided by the invention can be used for preparing the nano phase change capsule which has high thermal conductivity and high phase change latent heat and is easy to disperse, and the nano phase change capsule is loaded on the polylactic acid porous nanofiber substrate, so that the thermal conductivity and the cooling effect of the substrate are greatly improved;
(2) the method of the invention fully utilizes the characteristic that the nanometer pores can effectively adsorb organic micromolecules and embedded nano particles, adopts an electrostatic spinning method to prepare the superfine polylactic acid porous nano fiber with the nanometer pore structure on the surface and inside of the fiber, then takes the polylactic acid porous nano fiber with a large amount of nanometer pores as the base material, directly and firmly embeds the phase change nano capsule into the polylactic acid porous nano fiber base material with the nanometer pore structure by adjusting the nanometer phase change capsule to be in a proper size and directly through the adsorption effect of the nanometer pores and the interaction of static electricity and functional groups between the base material and the surface of the nanometer capsule, can effectively avoid the defects that the traditional micron-sized material is difficult to be directly loaded on the surface of the base material, the micron-sized material is easy to fall off, the loading process is complex and toxic cross-linking agents are possibly used, the practical application effect is excellent.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to specific examples.
The following examples are intended to illustrate the present invention, but not to limit the scope of the invention, which is defined by the claims.
Unless otherwise specified, the test reagents and materials used in the examples of the present invention are commercially available.
Unless otherwise specified, the technical means used in the examples of the present invention are conventional means well known to those skilled in the art.
Example 1
The invention provides a polylactic acid porous nanofiber-nano phase change capsule composite material and a preparation method thereof, and the preparation method comprises the following specific steps:
(1) dissolving polylactic acid particles in a mass ratio of 8: 1, uniformly mixing the dichloromethane and the N, N-dimethylacetamide to obtain spinning solution with the mass fraction of 7% for later use;
(2) spinning voltage is 16kV, flow of spinning solution is 1mL/h, electrostatic spinning is carried out to obtain a polylactic acid porous nanofiber matrix, the average diameter of fibers of the prepared polylactic acid porous nanofiber matrix is 1.88 mu m, the porosity is 24.3%, and the average pore diameter is 256.8 nm;
(3) adding 10g hexadecanoic acid and 0.20g sodium dodecyl sulfate into 100ml water, stirring at 70 deg.C at 600rpm for 15min, and homogenizing at 10000rpm for 8min to obtain hexadecanoic acid miniemulsion;
(4) adding 10ml of tetraethyl orthosilicate into 90ml of absolute ethyl alcohol, uniformly mixing, adding 30ml of water, adjusting the pH value to 11 by using ammonia water, and stirring for 30min to obtain silicon dioxide sol;
(5) and (3) mixing the silica sol prepared in the step (4) according to the weight ratio of 1: dropping the volume of 1 into the hexadecanoic acid miniemulsion prepared in the step (3), stirring for 6 hours at 70 ℃, and cooling to normal temperature to obtain an emulsion of nano phase change capsules, wherein the average particle size of the nano phase change capsules in the prepared emulsion is 102nm, the latent heat of phase change is 122.3kJ/kg, and the thermal conductivity coefficient is 0.28W/m.K;
(6) and (3) placing the polylactic acid porous nanofiber matrix prepared in the step (2) into the emulsion of the nano phase change capsule prepared in the step (5), soaking while slowly stirring (40rpm), taking out after 20min, and drying to constant weight to obtain the polylactic acid porous nanofiber-nano phase change capsule composite material.
And finally, folding the prepared polylactic acid porous nanofiber-nano phase change capsule composite material into a cylindrical cooling filter section with the diameter of 6mm and the length of 22mm, and simulating and testing the effect of the composite material as a heating non-combustion cooling section.
The test result shows that the prepared cylindrical cooling filter section can well reduce the temperature of the flue gas, the temperature of the cooled flue gas is about 58 ℃, and the cooling effect is good; and stability is good, and high temperature flue gas is difficult to take place to glue when passing through and sinks, and then keeps the smooth and easy circulation of flue gas, and the fragrant smell saturation of flue gas is high, can effectively improve user's suction experience and feel.
Example 2
The invention provides a polylactic acid porous nanofiber-nano phase change capsule composite material and a preparation method thereof, and the preparation method comprises the following specific steps:
(1) dissolving polylactic acid particles in a solution with a mass ratio of 10: 1, uniformly mixing the dichloromethane and the N, N-dimethylacetamide to obtain spinning solution with the mass fraction of 9% for later use;
(2) spinning voltage is 17.5kV, flow of spinning solution is 1.2mL/h, electrostatic spinning is carried out to obtain a polylactic acid porous nanofiber matrix, the average diameter of fibers of the prepared polylactic acid porous nanofiber matrix is 1.92 mu m, the porosity is 25.4%, and the average pore diameter is 249.8 nm;
(3) adding 12g hexadecanoic acid and 0.20g sodium dodecyl sulfate into 100ml water, stirring at 72 deg.C and 900rpm for 10min, and homogenizing at 15000rpm for 5min to obtain hexadecanoic acid miniemulsion;
(4) adding 12ml of tetraethyl orthosilicate into 90ml of absolute ethyl alcohol, uniformly mixing, adding 30ml of water, adjusting the pH value to 12 by using ammonia water, and stirring for 25min to obtain silicon dioxide sol;
(5) mixing the silica sol prepared in the step (4) according to the weight ratio of 1.2: 1, dripping the solution into the hexadecanoic acid miniemulsion prepared in the step (3), stirring the solution at 70 ℃ for 7.5 hours, and cooling the solution to normal temperature to obtain an emulsion of nano phase change capsules, wherein the average particle size of the nano phase change capsules in the prepared emulsion is 96nm, the latent heat of phase change is 125.8kJ/kg, and the thermal conductivity coefficient is 0.31W/m.K;
(6) and (3) placing the polylactic acid porous nanofiber matrix prepared in the step (2) into the emulsion of the nano phase change capsule prepared in the step (5), soaking while slowly stirring (40rpm), taking out after 25min, and drying to constant weight to obtain the polylactic acid porous nanofiber-nano phase change capsule composite material.
And finally, folding the prepared polylactic acid porous nanofiber-nano phase change capsule composite material into a cylindrical cooling filter section with the diameter of 6mm and the length of 22mm, and simulating and testing the effect of the composite material as a heating non-combustion cooling section.
The test result shows that the prepared cylindrical cooling filter section can well reduce the temperature of the flue gas, the temperature of the cooled flue gas is about 56 ℃, and the cooling effect is good; and stability is good, and high temperature flue gas is difficult to take place to glue when passing through and sinks, and then keeps the smooth and easy circulation of flue gas, and the fragrant smell saturation of flue gas is high, can effectively improve user's suction experience and feel.
Finally, while the invention has been described in detail by way of general description and specific embodiments, it will be apparent to those skilled in the art that certain changes and modifications may be made thereto without departing from the scope of the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A polylactic acid porous nanofiber-nanometer phase change capsule composite material is characterized in that,
the polylactic acid porous nanofiber comprises a polylactic acid porous nanofiber matrix and nano phase change capsules attached to nanopores of the polylactic acid porous nanofiber matrix, wherein the porosity coverage rate of the polylactic acid porous nanofiber matrix is 15-30%, the average pore size is 180-280nm, and the particle size of the nano phase change capsules is 80-120 nm.
2. The polylactic acid porous nanofiber-nanochannel phase change capsule composite material of claim 1, wherein the porous nanofiber-nanochannel phase change capsule composite material comprises,
the polylactic acid porous nanofiber matrix is prepared by an electrostatic spinning method, and the method comprises the following specific steps:
and dissolving polylactic acid particles in a mixed solvent of dichloromethane and N, N-dimethylacetamide, uniformly mixing, and performing electrostatic spinning by using the uniformly mixed solution as a spinning solution to obtain the polylactic acid porous nanofiber matrix.
3. The polylactic acid porous nanofiber-nanochannel phase change capsule composite material of claim 2,
in the preparation process of the polylactic acid porous nanofiber matrix,
the mass fraction of polylactic acid in the spinning solution is 5-12%;
and/or in the mixed solvent, the mass ratio of the dichloromethane to the N, N-dimethylacetamide is 5-10: 1;
and/or the spinning voltage is 10-20 kV;
and/or the flow rate of the spinning solution is 1-2 ml/h.
4. The polylactic acid porous nanofiber-nanochannel phase change capsule composite material of claim 1, wherein the porous nanofiber-nanochannel phase change capsule composite material comprises,
the nano phase change capsule is of a nano composite structure with hexadecanoic acid as a core and silicon dioxide as a shell;
preferably, the nano phase change capsule is prepared by adopting a miniemulsion method assisted with a sol-gel method, and specifically comprises the following steps:
and (3) dropwise adding the silica sol into the hexadecanoic acid miniemulsion, stirring for 4-8h at the temperature of 65-80 ℃, and cooling to normal temperature to obtain the emulsion of the nano phase change capsule.
5. The polylactic acid porous nanofiber-nanochannel phase change capsule composite material of claim 4,
in the preparation process of the nano phase change capsule,
the concentration of the silicon dioxide sol is 0.01-0.03 g/ml;
and/or the concentration of the palmitic acid miniemulsion is 0.09-0.12 g/ml;
and/or the adding volume of the silica sol is 0.6-2.4 times, preferably 1.2 times of the volume of the hexadecanoic acid miniemulsion;
and/or the stirring speed is 500-800 rpm.
6. The polylactic acid porous nanofiber-nanochannel phase change capsule composite material of claim 4 or 5, wherein the phase change material is a polymer,
the palmitic acid miniemulsion is prepared by the following method:
adding 9-12g hexadecanoic acid and 0.15-0.22g emulsifier into 100ml water, stirring at the speed of 300-1000rpm at 65-75 ℃ for 5-20min, and homogenizing at the speed of 7000-15000rpm for 3-15min to obtain hexadecanoic acid miniemulsion;
the emulsifier is preferably sodium lauryl sulfate.
7. The polylactic acid porous nanofiber-nanochannel phase change capsule composite material of claim 4 or 5, wherein the phase change material is a polymer,
the silica sol is prepared by the following method:
adding 8-12ml tetraethyl orthosilicate into 90ml absolute ethyl alcohol, uniformly mixing, adding 30ml water, adjusting the pH value to 9-12 by using ammonia water, and stirring for 20-40min to obtain the silicon dioxide sol.
8. The preparation method of the polylactic acid porous nanofiber-nano phase change capsule composite material as claimed in any one of claims 1 to 7,
comprises placing polylactic acid porous nanofiber matrix into emulsion of nanometer phase change capsule, stirring, soaking for 15-30min, taking out, and drying to constant weight.
9. The preparation method of the polylactic acid porous nanofiber-nano phase change capsule composite material as claimed in claim 8,
during the impregnation process, the stirring speed is controlled to be 10-60 rpm.
10. Use of the polylactic acid porous nanofiber-nanocrystallization capsule composite material as set forth in any one of claims 1 to 7 for preparing a cooling section for heating non-combustible tobacco.
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| CN202010582995.2A CN113832735B (en) | 2020-06-23 | 2020-06-23 | Polylactic acid porous nanofiber-nanometer phase change capsule composite material and preparation method and application thereof |
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| CN202010582995.2A CN113832735B (en) | 2020-06-23 | 2020-06-23 | Polylactic acid porous nanofiber-nanometer phase change capsule composite material and preparation method and application thereof |
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| CN113832735A true CN113832735A (en) | 2021-12-24 |
| CN113832735B CN113832735B (en) | 2023-07-25 |
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