CN110129916B - Intelligent paraffin/polyacrylonitrile temperature-regulating nanofiber - Google Patents

Intelligent paraffin/polyacrylonitrile temperature-regulating nanofiber Download PDF

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CN110129916B
CN110129916B CN201910307990.6A CN201910307990A CN110129916B CN 110129916 B CN110129916 B CN 110129916B CN 201910307990 A CN201910307990 A CN 201910307990A CN 110129916 B CN110129916 B CN 110129916B
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temperature
spinning solution
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polyacrylonitrile
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CN110129916A (en
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张明
方旖旎
陈佳伟
伊利强
姚菊明
祝国成
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Zhejiang Sci Tech University ZSTU
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02—Materials undergoing a change of physical state when used
    • C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
    • C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
    • 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
    • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
    • D01D5/30—Conjugate filaments; Spinnerette packs therefor
    • D01D5/34—Core-skin structure; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/08—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyacrylonitrile as constituent
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/18—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from other substances

Abstract

The invention discloses a paraffin/polyacrylonitrile intelligent temperature-regulating nanofiber which is of a skin-core structure, wherein a skin layer is a fiber-forming polymer, a core layer is a mixed paraffin phase-change material, the skin layer is formed by spinning an external phase spinning solution, the external phase spinning solution is a mixture of polyacrylonitrile and N, N-dimethylacetamide, the core layer is formed by spinning an internal phase spinning solution, and the internal phase spinning solution is a mixture of N-eicosane and N-tetradecane. The invention has better spinnability, temperature control property and wide application prospect.

Description

Intelligent paraffin/polyacrylonitrile temperature-regulating nanofiber
Technical Field
The invention relates to the field of functional fibers, in particular to intelligent paraffin/polyacrylonitrile temperature-regulating nanofiber.
Background
The temperature-regulating fiber is a composite fiber with a temperature regulating function, which is prepared by coating a phase-change material in the fiber or coating and finishing the phase-change material on the surface of the fiber. Phase change materials have been widely used in the fields of vehicle thermal buffering, construction, green house agriculture greenhouses, computer chips and textiles. The phase change material is applied to textile fiber materials, and can play an effective buffering role on the temperature change of human bodies through the response effect of the phase change material on the temperature change, so that the body sensing temperature is kept constant within a certain time.
At present, the preparation method of the phase-change fiber mainly comprises a hollow fiber dipping method, a blending spinning method, a microcapsule method, a melt spinning method, a chemical grafting method, a wet spinning method and the like, but the phase-change fiber prepared by the dipping filling method and the blending spinning method has poor coating effect, the phase-change material is easy to run off, the fiber prepared by the chemical method and the microcapsule method has good performance, but the latent heat of phase change is poor, the performance and the coating property of the fiber prepared by the melt spinning method and the wet spinning method meet the use requirement, but the preparation process is complex, and the preparation cost is high.
Disclosure of Invention
The invention aims to provide the intelligent paraffin/polyacrylonitrile temperature-regulating nanofiber which has good spinnability, temperature control property and wide application prospect.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a paraffin/polyacrylonitrile intelligence nanofiber that adjusts temperature, is skin-core structure, and the cortex is fiber forming polymer, and the sandwich layer is mixed paraffin phase change material, the cortex is formed by outer phase spinning liquid spinning, outer phase spinning liquid is polyacrylonitrile and N, N-dimethylacetamide mixture, the sandwich layer is formed by inner phase spinning liquid spinning, inner phase spinning liquid is the mixture of N-eicosane and N-tetradecane.
According to the invention, polyacrylonitrile is selected as a skin layer fiber forming material, compound paraffin is used as a core layer phase change material, a coaxial electrostatic spinning method is adopted to prepare the nanometer phase change temperature regulating fiber, the polyacrylonitrile is used for effectively coating the core layer eicosane and tetradecane compound two-component phase change material, a three-dimensional network structure is constructed, and the capillary effect of the nanometer phase change temperature regulating fiber is fully utilized to intensively embody the temperature control performance of the two-component phase change material within a certain range. The invention effectively coats the multi-component phase-change paraffin by a simple coaxial spinning technology, limits the size to be nano-scale, and provides a novel and simple preparation method for future application in taking intelligent products.
Preferably, the mass concentration of polyacrylonitrile in the external phase spinning solution is 10-15%.
Preferably, the mixture of n-eicosane and n-tetradecane is prepared by mixing n-eicosane and n-tetradecane according to the mass ratio of 1: 3-1: 7.
Preferably, the preparation method is as follows:
the method comprises the following steps: dissolving the water-washed polyacrylonitrile in N, N-dimethylacetamide, and stirring for 12 hours on a magnetic stirrer to prepare an external phase spinning solution with the mass concentration of the polyacrylonitrile being 10-15%;
step two: mixing n-eicosane and n-tetradecane which is liquid at normal temperature according to the mass ratio of 1: 3-1: 7 to prepare an internal phase spinning solution;
step three: and transferring the external phase spinning solution and the internal phase spinning solution into an injector, adding the injector and the coaxial nozzle, spinning in a high-voltage electrostatic field, receiving the fibers by a roller coated with tin foil paper on the surface, and drying to obtain the paraffin/polyacrylonitrile intelligent temperature-regulating nanofiber.
Preferably, in the step three spinning, the flow rate of the external phase spinning solution is 0.5mL h-1The flow rate of the internal phase spinning solution was 0.3mL h-1。
Preferably, the voltage is controlled to be 10kV to 14kV in the third spinning step.
Preferably, the receiving distance is 10-15 cm during the spinning in the third step.
Preferably, the drying in the third step is performed in an oven at 60 ℃ for 6 hours or more under normal pressure. DMF is removed by drying, so that the fiber is prevented from being sticky, and the temperature regulation effect is enhanced.
The invention has the beneficial effects that:
(1) according to the preparation method, the skin-core structure coating rate is regulated and controlled by changing the concentration of the external-phase spinning solution, and the appropriate concentration of the external-phase spinning solution can effectively protect the core layer material and prevent the core layer material from losing while coating the core layer material to the maximum extent, and meanwhile, the excellent mechanical property of the core layer material is guaranteed.
(2) The nano-scale temperature-regulating fiber prepared by the preparation method has a large phase-change enthalpy value. The temperature change response of the phase change fiber to a specific temperature interval is regulated and controlled by changing the compounding ratio of the core layer phase change material.
(3) The nano-scale phase change fiber prepared by the preparation method has an obvious skin-core structure, avoids the problem that the phase change material in the traditional phase change fiber is easy to lose, enhances the temperature regulation effect of the phase change fiber, prepares the nano-scale fiber by coaxial electrostatic spinning, and makes full use of the capillary effect of the nano-scale phase change temperature regulation fiber to intensively embody the temperature control of the two-component phase change material within a certain range.
Drawings
Fig. 1 is a scanning electron microscope image and a transmission electron microscope image of the temperature-controlled nanofibers in example 1, example 2, and example 3.
FIG. 2 is a differential scanning calorimetry curve for the temperature-regulating nanofibers of example 1, example 2, and example 3, where heat flow is the heat flow and temperature is the temperature.
Fig. 3 is a scanning electron micrograph and a transmission electron micrograph of the temperature-controlled nanofibers of examples 3, 4, 5, and 6.
Fig. 4 is a differential scanning calorimetry curve for the temperature-adjusted nanofibers of example 3, example 4, example 5, and example 6.
Fig. 5 is a thermogravimetric analysis curve of the temperature-regulated nanofibers of example 3, example 4, example 5, and example 6, where Weight: weight, deriva.weight: first derivative of weight.
Detailed Description
The technical solution of the present invention will be further specifically described below by way of specific examples.
In the present invention, the raw materials and equipment used are commercially available or commonly used in the art, unless otherwise specified. The methods in the following examples are conventional in the art unless otherwise specified.
The main reagent information mentioned in the following examples is polyacrylonitrile (PAN, M ≈ 1.4X 10)5From china petrochemical shanghai petrochemical company); n, N-dimethylformamide (DMF, 99.5%, available from hangzhou high-precision chemical company, ltd); tetradecane (C)1498% and a phase transition temperature of 5.86 ℃, produced by alatin bio-technology ltd); eicosane (C)2099% and a phase transition temperature of 36.8 ℃, produced by alatin bio-technology ltd).
The surface structure of the fibers mentioned in the following examples was measured by JSM-6700F field emission Electron microscope (FE-SEM, JEO)L, Japan); the internal structure of the fiber was measured using a JSM-2100 Transmission Electron microscope (TEM, JEOL, Japan); the temperature control properties of the fibers were tested using a differential scanning calorimeter (TA, USA) to test the fibers in nitrogen (N)2) At 5 deg.C for min in atmosphere-1The temperature is increased and decreased at a constant speed, and the temperature range is-10 ℃ to 40 ℃; the thermal stability of the fibers was tested using a thermogravimetric analyzer (PE, USA) to test the fibers at N2At the middle temperature of 10 ℃ for min-1The temperature rise rate of (2) for thermal decomposition, and the temperature range is 40-700 ℃.
Example 1
(1) And dissolving the washed PAN in DMF, placing the solution on a magnetic stirrer, and stirring for 12 hours to prepare a homogeneous electrostatic spinning solution with the PAN mass fraction of about 10 percent, wherein the homogeneous electrostatic spinning solution is used as a skin layer fiber forming material of the temperature-adjusting fiber.
(2) Eicosane and tetradecane which is liquid at normal temperature are mutually soluble, the mass ratio of the eicosane to the tetradecane is 1:5, and the eicosane is used as a core layer phase change material of the temperature-adjusting fiber.
(3) And (3) taking the PAN solution as an external phase spinning solution and the eicosane/tetradecane mixed solution as an internal phase spinning solution, transferring the solutions into an injector, adding the solutions into a coaxial nozzle, spinning in a high-voltage electrostatic field, and receiving the nanofibers by a roller coated with tin foil paper on the surface. The external positive voltage and the external negative voltage of the coaxial nozzle and the receiving roller are respectively 13kV and-1.5 kV, the receiving distance is about 15cm, the outer diameter of the nozzle is 1.01mm, and the inner diameter of the nozzle is 0.41 mm. The flow rates of the internal phase and the external phase are respectively 0.3mL h-1、0.5mL h-1. Drying the nano-fiber in a 60 ℃ oven to obtain the temperature-adjusting nano-fiber.
Example 2
(1) And dissolving the washed PAN in DMF, placing the solution on a magnetic stirrer, and stirring for 12 hours to prepare a homogeneous electrostatic spinning solution with the PAN mass fraction of about 12 percent, wherein the homogeneous electrostatic spinning solution is used as a skin layer fiber forming material of the temperature-adjusting fiber.
(2) Eicosane and tetradecane which is liquid at normal temperature are mutually soluble, the mass ratio of the eicosane to the tetradecane is 1:5, and the eicosane is used as a core layer phase change material of the temperature-adjusting fiber.
(3) Using PAN solution as external phase spinning solution, using eicosane/tetradecane mixed solution as internal phase spinning solution, transferring into syringe and adding into the syringeIn a coaxial nozzle, spinning is carried out in a high-voltage electrostatic field, and the nano-fibers are received by a roller coated with tin foil paper. The external positive voltage and the external negative voltage of the coaxial nozzle and the receiving roller are respectively 13kV and-1.5 kV, the receiving distance is about 15cm, the outer diameter of the nozzle is 1.01mm, and the inner diameter of the nozzle is 0.41 mm. The flow rates of the internal phase and the external phase are respectively 0.3mL h-1、0.5mL h-1. Drying the nano-fiber in a 60 ℃ oven to obtain the temperature-adjusting nano-fiber.
Example 3
(1) And dissolving the washed PAN in DMF, placing the solution on a magnetic stirrer, and stirring for 12 hours to prepare a homogeneous electrostatic spinning solution with the PAN mass fraction of about 15 percent, wherein the homogeneous electrostatic spinning solution is used as a skin layer fiber forming material of the temperature-adjusting fiber.
(2) Eicosane and tetradecane which is liquid at normal temperature are mutually soluble, the mass ratio of the eicosane to the tetradecane is 1:5, and the eicosane is used as a core layer phase change material of the temperature-adjusting fiber.
(3) And (3) taking the PAN solution as an external phase spinning solution and the eicosane/tetradecane mixed solution as an internal phase spinning solution, transferring the solutions into an injector, adding the solutions into a coaxial nozzle, spinning in a high-voltage electrostatic field, and receiving the nanofibers by a roller coated with tin foil paper on the surface. The external positive voltage and the external negative voltage of the coaxial nozzle and the receiving roller are respectively 13kV and-1.5 kV, the receiving distance is about 15cm, the outer diameter of the nozzle is 1.01mm, and the inner diameter of the nozzle is 0.41 mm. The flow rates of the internal phase and the external phase are respectively 0.3mL h-1、0.5mL h-1. Drying the nano-fiber in a 60 ℃ oven to obtain the temperature-adjusting nano-fiber.
Example 4
(1) And dissolving the washed PAN in DMF, placing the solution on a magnetic stirrer, and stirring for 12 hours to prepare a homogeneous electrostatic spinning solution with the PAN mass fraction of about 15 percent, wherein the homogeneous electrostatic spinning solution is used as a skin layer fiber forming material of the temperature-adjusting fiber.
(2) Eicosane and tetradecane which is liquid at normal temperature are mutually soluble, the mass ratio of the eicosane to the tetradecane is 1:3, and the eicosane is used as a core layer phase change material of the temperature-adjusting fiber.
(3) And (3) taking the PAN solution as an external phase spinning solution and the eicosane/tetradecane mixed solution as an internal phase spinning solution, transferring the solutions into an injector, adding the solutions into a coaxial nozzle, spinning in a high-voltage electrostatic field, and receiving the nanofibers by a roller coated with tin foil paper on the surface.The external positive voltage and the external negative voltage of the coaxial nozzle and the receiving roller are respectively 13kV and-1.5 kV, the receiving distance is about 15cm, the outer diameter of the nozzle is 1.01mm, and the inner diameter of the nozzle is 0.41 mm. The flow rates of the internal phase and the external phase are respectively 0.3mL h-1、0.5mL h-1. Drying the nano-fiber in a 60 ℃ oven to obtain the temperature-adjusting nano-fiber.
Example 5
(1) And dissolving the washed PAN in DMF, placing the solution on a magnetic stirrer, and stirring for 12 hours to prepare a homogeneous electrostatic spinning solution with the PAN mass fraction of about 15 percent, wherein the homogeneous electrostatic spinning solution is used as a skin layer fiber forming material of the temperature-adjusting fiber.
(2) Eicosane and tetradecane which is liquid at normal temperature are mutually soluble, the mass ratio of the eicosane to the tetradecane is 1:7, and the eicosane is used as a core layer phase change material of the temperature-adjusting fiber.
(3) And (3) taking the PAN solution as an external phase spinning solution and the eicosane/tetradecane mixed solution as an internal phase spinning solution, transferring the solutions into an injector, adding the solutions into a coaxial nozzle, spinning in a high-voltage electrostatic field, and receiving the nanofibers by a roller coated with tin foil paper on the surface. The external positive voltage and the external negative voltage of the coaxial nozzle and the receiving roller are respectively 13kV and-1.5 kV, the receiving distance is about 15cm, the outer diameter of the nozzle is 1.01mm, and the inner diameter of the nozzle is 0.41 mm. The flow rates of the internal phase and the external phase are respectively 0.3mL h-1、0.5mL h-1. Drying the nano-fiber in a 60 ℃ oven to obtain the temperature-adjusting nano-fiber.
Example 6
(1) Dissolving the washed PAN in DMF, placing the solution on a magnetic stirrer, and stirring for 12 hours to prepare homogeneous electrostatic spinning solution with the PAN mass fraction of about 15 percent as temperature-regulating fiber spinning solution.
(2) The positive and negative voltages of the nozzle and the receiving roller are respectively 13kV and-1.5 kV, the receiving distance is about 15cm, and the flow rate is 0.5mL h-1. Drying the nano-fiber in a 60 ℃ oven to obtain the temperature-adjusting nano-fiber.
Scanning electron microscope and transmission electron microscope images of the intelligent temperature-adjusting paraffin/polyacrylonitrile nanofiber obtained in example 1, example 2 and example 3 are shown in fig. 1. The paraffin/polyacrylonitrile intelligent temperature-regulating nanofiber has an obvious skin-core structure, and shows that the preparation method can successfully prepare the phase-change fiber which takes the compound paraffin as the phase-change core material and the polyacrylonitrile as the skin material.
As can be seen from the SEM of fig. 1a, c, e, the diameter of the nanofibers tends to increase (100 nm to 500nm) with increasing concentration, and the diameter of the fibers becomes larger as the concentration of the spinning solution increases during the forming process, because the fibers need to overcome a larger surface tension. In addition, the surface is relatively smooth to the appearance of partial stripe-shaped grooves. The grooves occur due to the presence of the core phase change material and the increase in viscosity of the PAN-based spinning solution. It is worth noting that under the three concentration gradients, the nanofibers have good formability and maintain the nanoscale distribution. As shown in FIGS. 1b, d and f, the sheath-core structures of the three groups of nanofibers are successfully prepared, and the good forming degree shows that the PAN as an external phase spinning solution has low dependence on viscosity, so that the PAN has good industrial application prospect. The phase-change material of the common phase-change fiber is easy to run off, so that the temperature adjusting performance of the nanofiber has great instability. When the PAN concentration is 10%, the coating rate of the phase-change material is the highest, and the corresponding coating rate is reduced along with the increase of the concentration of the external-phase spinning solution. In addition, the relation between the diameter of the nano-fiber and the concentration of the polymer is consistent with the conclusion of SEM, and when the concentration of the external phase spinning solution is 15%, the diameter of the fiber is the largest, so that the coating strength is better. When the PAN concentration is 15%, the fiber diameter is 500-700 nm, and the melting enthalpy and the crystallization enthalpy respectively reach 38.07J/g and 34.06J/g.
Thermal performance tests were performed on the intelligent paraffin/polyacrylonitrile temperature-adjusting nanofibers obtained in example 1, example 2 and example 3, and the results are shown in fig. 2.
According to the heat absorption curves of three groups of samples under different PAN concentrations, the concentration of the cortical layer fiber-forming material has no obvious influence on the temperature-adjusting interval of the phase-change material. In conjunction with the conclusion that the skin layer concentration influences the coating rate of the phase-change material in fig. 1, it can be seen that the lower the skin layer concentration, the smaller the fiber diameter, and the greater the coating rate, while the phase-change material shows significant phase separation and the coating strength is limited. The application range and stability of the energy storage density are comprehensively considered, and the binary component regulation of the intelligent temperature-regulating nanofiber is carried out by selecting 15% PAN (polyacrylonitrile) concentration (the minimum enthalpy change value is still larger than 25J/g).
Fig. 3 shows scanning electron microscope and transmission electron microscope images of the temperature-controlled nanofibers obtained in examples 3, 4, 5, and 6.
Under the condition that the concentration of the skin layer fiber-forming material PAN is 15%, the influence of the core layer solution compounding ratio on the temperature-adjusting nanofiber is further researched. As shown in fig. 3, scans of three ratios PAN15@ C20: C14-NFs show that the nanofibers have diameters in the range of 500nm-700nm and some degree of grooves remain on the fiber surface. As can be seen from FIGS. 3b, d and f, as the proportion of tetradecane in the binary component increases, the diameter of the core layer becomes slightly smaller, and the cladding rate of the phase-change fiber also decreases. This is because the volume of the short-chain alkane tetradecane is smaller than that of the long-chain alkane eicosane, and when the ratio is increased, the volume is reduced after the fiber formation. But the integral coating rate is still more than 50 percent, and the coating effect and the nano-size distribution are better.
Thermal performance tests were performed on the intelligent temperature-adjusting paraffin/polyacrylonitrile nanofibers obtained in example 3, example 4 and example 5, and the results are shown in fig. 3.
The phase-change enthalpy (including melting and crystallization processes) and the phase-change temperature of all samples are lower than the theoretical value of the phase-change material, and the reason for this is that hydrogen bonds are formed between inner and outer phase molecules and the phase-change process of tetradecane and eicosane is limited to a certain extent by the three-dimensional network structure of the temperature-regulating nanofiber. In addition, in the processes of temperature-adjusting nanofiber heat absorption and heat release, the melting temperature and the melting enthalpy are slightly greater than the crystallization temperature and the enthalpy value, which are caused by the phenomena of supercooling crystallization and phase separation of the phase-change material in different degrees.
The thermal stability test was performed on the temperature-adjusting nanofibers obtained in example 3, example 4, example 5, and example 6, and the results are shown in fig. 5.
As shown in fig. 5, the mass changes that occurred around 100 ℃ and after 300 ℃ were caused by evaporation of water and decomposition of the PAN substrate, respectively. Three groups of samples of PAN15@ C20: C14-NFs all showed two stages of mass loss in the temperature range of 130-300 ℃ and faster decomposition rate, which is mainly attributed to the thermal decomposition process of tetradecane and eicosane, and the conclusion further illustrates the successful preparation of the PAN15@ C20: C14-NFs temperature-regulating nanofiber skin-core structure. In addition, the phase-change material and the PAN substrate are decomposed at the temperature of 130 ℃ and 300 ℃ respectively, and the temperature-regulating nanofiber is proved to have good thermal stability, so that the temperature-regulating nanofiber has a wide development prospect in the development of intelligent products for clothing.
TABLE 1
Figure BDA0002030488750000061
Figure BDA0002030488750000071
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.

Claims (2)

1. The intelligent paraffin/polyacrylonitrile temperature-regulating nanofiber is characterized in that: the composite material is of a skin-core structure, a skin layer is a fiber-forming polymer, a core layer is a mixed paraffin phase-change material, the skin layer is formed by spinning an external phase spinning solution, the external phase spinning solution is a mixture of polyacrylonitrile and N, N-dimethylacetamide, the core layer is formed by spinning an internal phase spinning solution, and the internal phase spinning solution is a mixture of N-eicosane and N-tetradecane;
the preparation method comprises the following steps:
the method comprises the following steps: dissolving the water-washed polyacrylonitrile in N, N-dimethylacetamide, and stirring for 12 hours on a magnetic stirrer to prepare an external phase spinning solution with the mass concentration of the polyacrylonitrile being 10-15%;
step two: mixing n-eicosane and n-tetradecane which is liquid at normal temperature according to the mass ratio of 1: 3-1: 7 to prepare an internal phase spinning solution;
step three: transferring the external phase spinning solution and the internal phase spinning solution into an injector and adding the same into a coaxial nozzle, spinning in a high-voltage electrostatic field, receiving fibers through a roller coated with tin foil paper on the surface, and drying to obtain paraffin/polyacrylonitrile intelligent temperature-regulating nanofibers;
when spinning is carried out in the third step, the flow velocity of the external phase spinning solution is 0.5 mL.h-1The flow rate of the internal phase spinning solution was 0.3 mL. multidot.h-1(ii) a During spinning, controlling the voltage to be 10-14 kV; and in the third step, the receiving distance is 10-15 cm during spinning.
2. The intelligent paraffin/polyacrylonitrile temperature-regulating nanofiber as claimed in claim 1, wherein: and the drying in the third step is drying for more than 6 hours in an oven at 60 ℃ under normal pressure.
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