CN106367819B - A kind of preparation facilities of function nano line - Google Patents

Abstract

The invention relates to a preparation device for functional nanowires, which belongs to the field of electrospinning, and mainly includes a barrel, a fixing plate, a bolt, a splitter plate, a heating ring, a flow channel, a viscosity-increasing ring, and an airflow-assisted outer cone type electrospinning Nozzle, atomizer, high-voltage electrostatic generator, perforated acrylic plate, electrode plate, receiving roller, cyclone airflow assist device, airflow duct, mixer, regulating valve, flange, air injection device, functional particle A, air pump and functional particle b. Functional particle A and functional particle B are installed in the jet device, which are distributed in the upper and lower parts of the airflow conduit. The upper and lower air injection devices equipped with functional particles spray the functional particles into the air flow pipeline respectively to realize the inner and outer coating of the nanofibers by the functional particles. In the present invention, the nanofibers wrapped inside and outside the functional particles are finally prepared, and the multifunctionalization of the nanofibers is realized. The whole device is easy to operate, can quickly prepare functional nanowires, has uniform fiber diameter, good orientation, high efficiency and environmental protection, and considerable output.

Description

A device for preparing functional nanowires

technical field

The invention relates to a melt differential electrospinning device for rapidly preparing functional nanowires by using an airflow assisting device, and belongs to the field of electrospinning.

Background technique

Due to its unique structure and superior performance, nanofibers have broad application prospects in the fields of biochemical protection, high-efficiency filtration, loading materials, and biomedicine. It is particularly important to functionalize nanofibers. Functional nanofiber materials designed and prepared by electrospinning technology are one of the current research hotspots in the field of nanomaterials.

At present, the electrospinning method is used to prepare functional nanofibers mainly through solution blending for spinning. Chinese invention patent (application number: 201510216599.7) a polycrown ether composite nanofiber material and its preparation method and application use polycrown ether and base material to dissolve and mix to form a mixed solution, and use the electrostatic spinning method to spin the mixed solution Made polycrown ether functionalized nanofibers. Although this method can prepare functional fibers, it uses toxic solvents for solution electrospinning, which pollutes the environment and has low production efficiency. However, the present invention uses a melt differential electrospinning device to prepare functional nanowires, which has high output, rapid preparation, safety and high efficiency, simple device and easy operation.

Contents of the invention

A preparation device for functional nanowires of the present invention proposes the use of airflow to assist the outer cone-shaped electrostatic spinning nozzle, which has an axial draft effect on fibers. At the same time, the cyclone airflow auxiliary device connected to the air pump is placed in the center of the electrode plate with holes to generate a cyclone, and the fibers are sucked into the cyclone airflow auxiliary device to produce secondary stretching, and the fibers achieve the effect of drafting and bunching. The upper and lower air injection devices equipped with functional particles spray the functional particles into the air flow pipeline respectively to realize the inner and outer coating of the nanofibers by the functional particles. The jet device can be equipped with different functional particles, such as metal nanoparticles, phase-change material nanoparticles, oxide nanoparticles, antibacterial nanoparticles, UV-resistant nanoparticles, etc., and finally make nanofibers wrapped inside and outside the functional particles to realize nano Multifunctionalization of fibers. The take-up roller collects the fibers, and the rotation of the rollers can orient the falling fibers to make the fiber diameter more uniform.

The technical solution to achieve the above purpose is: a preparation device for functional nanowires, which mainly includes: barrel, fixing plate, bolt, splitter plate, heating ring, flow channel, adhesion-increasing ring, air-assisted outer cone electrospinning Nozzle, atomizer, high-voltage electrostatic generator, acrylic plate with holes, electrode plate, receiving roller, cyclone airflow auxiliary device, airflow duct, mixer, regulating valve, flange, air injection device, functional particle A, air pump, functional particle B etc. The barrel and the splitter plate are connected by bolts through the fixing plate. The outer cylindrical surface of the outer cone airflow conduit and the inner cylindrical hole of the splitter plate form a gap, and the melt flows in the gap to make it evenly distributed in the circumferential direction. The airflow-assisted outer cone electrospinning nozzle and the cyclone airflow auxiliary device are coaxially arranged, the outer layer is covered with a heating ring, and the adhesion-increasing ring is connected by threads. The adhesion-increasing ring can be adjusted up and down in the axial direction according to the viscosity of the polymer to ensure The fibers are coated with functional particles before curing. Functional particles (functional particles A and B can be the same substance or different substances) are housed in the jet device, which are distributed in the upper and lower parts of the airflow conduit. The air injection device sprays the functional particle A into the mixer and mixes it evenly, then enters the air flow pipeline, and evenly adheres to the inside of the fiber bundle, and the functional particle B is sprayed on the outside of the fiber bundle through the airflow. The air pump generates high-speed airflow, which is connected to the cyclone airflow auxiliary device and the airflow duct in the middle of the nozzle through the regulating valve. The cyclone airflow auxiliary device is placed in the middle of the electrode plate with holes, and is fixed by the acrylic plate with holes to generate a cyclone, and evenly wrap the functional particles on the outer surface of the fiber bundle. The electrode plate is connected with the high-voltage electrostatic generator, and the receiving roller is placed directly under the electrode plate, and is driven by the motor to rotate.

The present invention is a preparation device for functional nanowires. The airflow assists the center of the outer cone-shaped electrostatic spinning nozzle to pass high-speed airflow, and the fibers are stretched and thinned under the action of the high-speed airflow, and at the same time, the local negative pressure formed by the high-speed airflow between the fiber bundles To achieve the gathering effect of fibers.

The invention relates to a preparation device for functional nanowires. Two air injection devices can be equipped with the same or different functional particles, and the supply amount is controlled by an air valve. The functional particles in the upper air injection device enter the nozzle through the air duct, and are scattered on the nanofiber bundle to form an inner coating. The functional particles in the lower air injection device are wrapped on the outer surface of the nanofiber bundle with the cyclone airflow to form an outer coating.

The functional particles installed in the jet device can be metal nanoparticles, phase-change material nanoparticles, oxide nanoparticles, antibacterial nanoparticles or UV-resistant nanoparticles, etc.

The present invention is a preparation device for functional nanowires. The airflow-assisted outer cone electrospinning nozzle is connected with the tackifier ring through threads. The tackifier ring can be adjusted up and down in the axial direction according to the viscosity of the polymer to ensure that the fibers are uniform before curing. Wrapped with functional particles.

The invention is a preparation device for functional nanowires. The lower part of the adhesion-enhancing ring is made into a cone shape with through holes, and a screen can be arranged to avoid the escape of functional particles, and the high-speed airflow can realize the secondary wrapping of functional particles. .

The invention is a preparation device for functional nanowires. The cyclone airflow auxiliary device is composed of an air inlet, a circumferential air cavity and four centrally symmetrical air outlets, so that the airflow can form a gathered airflow after entering the cyclone airflow auxiliary device, so that The upper inlet of the cyclone airflow auxiliary device forms a local negative pressure, which is beneficial for the fibers to gather and fall into the cyclone airflow auxiliary device, so as to achieve the effect of gathering and thinning the fibers.

The invention relates to a preparation device for functional nanowires. The high-speed rotation of the receiving roller is conducive to the orientation of the gathered fibers during the falling process, and the fibers finally collected on the receiving roller are oriented nanowires.

By the introduction of above technical scheme, compared with the prior art, the present invention has the following advantages:

1. The cyclone airflow auxiliary device can form a vertically downward gathered airflow, and form a local negative pressure above it to facilitate the fibers to fall into the upper air inlet. At the same time, the fibers can be bundled and the fibers can be greatly thinned.

2. The two air jet devices can be equipped with the same or different functional particles, which are attached to the nanofibers through different paths, forming functional particles to coat the inside and outside of the fibers, and realize the multifunctionalization of the nanofibers.

3. The lower part of the adhesion-enhancing ring is made into a conical shape with a through hole, and a screen can be arranged to avoid the escape of functional particles, and the high-speed airflow can realize the secondary wrapping of functional particles, so that the functional particles can be attached evenly and tightly.

4. The rotational speed of the receiving roller is generally consistent with the falling speed of the fiber, which is conducive to the orientation of the fiber and the regular collection of the fiber.

5. Using a melt differential electrospinning device and air-assisted method to prepare functional nanowires, the yield is high, the preparation is fast, and the effect is good.

Description of drawings

Fig. 1 is a schematic diagram of a preparation device of a functional nanowire according to the present invention.

FIG. 2 is a schematic diagram of an adhesion-promoting ring of the apparatus shown in FIG. 1 .

Fig. 3 is a schematic diagram of the screen mesh of the tackifying ring shown in Fig. 2

Fig. 4 is a top sectional schematic diagram of the cyclone airflow assisting device.

Figure 5 is a schematic front view sectional view of the cyclone airflow auxiliary device

In the figure: 1-barrel; 2-fixing plate; 3-bolt; 4-manifold plate; 5-heating ring; 6-runner; 7-adhesive ring; ;9-atomizer; 10-high voltage electrostatic generator; 11-acrylic plate with holes; 12-electrode plate; 13-receiving roller; Regulating valve; 18-flange; 19-jet device; 20-functional particle A; 21-air pump; 22-functional particle B.

7-1-circular wall; 7-2-screen; 7-3-air vent; 14-1-air inlet; 14-2-air outlet; 14-3-circular air cavity.

Detailed ways

A preparation device for functional nanowires of the present invention, as shown in Figure 1, mainly includes: a barrel 1, a fixing plate 2, a bolt 3, a diverter plate 4, a heating ring 5, a flow channel 6, a viscosity-increasing ring 7, an air flow Auxiliary outer cone electrospinning nozzle 8, atomizer 9, high-voltage electrostatic generator 10, perforated acrylic plate 11, electrode plate 12, receiving roller 13, cyclone airflow auxiliary device 14, airflow duct 15, mixer 16, Regulating valve 17, flange 18, air injection device 19, functional particle A20, air pump 21, functional particle B22, etc. Barrel 1 is connected with splitter plate 4 by bolt 3 . The airflow-assisted outer cone electrospinning nozzle 8 is coaxially arranged with the cyclone airflow assisting device 14, the outer layer is covered with the heating ring 5, and the center is connected to the air pump 21 through the airflow conduit 15. Functional particle A20 and functional particle B22 are housed in the jet device 19, which are divided into upper and lower parts of the airflow duct 15. The adhesion-increasing ring 7 is a thin-walled structure. The adhesion-increasing ring 7 is composed of two parts. The upper part of the adhesion-increasing ring 7 is connected to the lower end of the barrel 1, and the lower part of the adhesion-increasing ring 7 is connected to the upper end of the cyclone airflow auxiliary device 14. The airflow assisting device 14 is placed in the middle of the electrode plate 12 with holes, fixed by the acrylic plate 11 with holes, the electrode plate 12 is connected with the high-voltage electrostatic generator 10, the receiving roller 13 is placed directly under the electrode plate 12, and is driven by the motor. Rotational movement.

When working, it is first heated, and then polymer particles are added into the barrel 1, and a high-speed airflow is introduced into the air inlet of the cyclone airflow auxiliary device. The melt flows through the flow channel to form a uniform circular flow, and multiple jets are formed near the tip of the cone surface of the nozzle. The functional particles in the upper air injection device enter the middle of the nozzle through the airflow conduit, and are scattered on the nanofiber bundle with the high-speed airflow to form functional particles. clad. At the same time, the cyclone airflow auxiliary device connected to the air pump is placed in the center of the electrode plate with holes to generate a cyclone, and the fibers are sucked into the cyclone airflow auxiliary device to produce secondary stretching, and the fibers are further stretched and refined to achieve the effect of drafting and clustering . In the lower air injection device, the functional particles are wrapped on the outer surface of the nanofiber bundle with the cyclone airflow, forming an outer coating of the functional particles. Under the multi-stretching effect of the electric field force and the vertical downward high-speed airflow generated by the cyclone airflow auxiliary device, the melt forms a large number of jets and falls into the cyclone airflow auxiliary device and gathers them together. Falling on the rotating receiving roller, when the linear speed of the roller is equal to the falling speed of the fiber, the rotating receiving roller can realize the regular collection of the fiber, which is beneficial to the orientation of the fiber. The whole device is easy to operate, can quickly prepare functional nanowires, has uniform fiber diameter, good orientation, high efficiency and environmental protection, and considerable output.

The invention relates to a preparation device for functional nanowires. The lower part of the adhesion-enhancing ring 7 is made into a cone shape, as shown in Figure 2 and Figure 3, and the middle part of the ring wall 7-1 has a vent hole 7-3, which can be used close to the cyclone A screen 7-2 is arranged at the ventilation hole 7-3 of the airflow assisting device 14 to prevent the functional particles from escaping from the ventilation hole 7-3, and the high-speed airflow passes through to realize the secondary encapsulation of the functional particles.

A preparation device for functional nanowires of the present invention, the cyclone airflow auxiliary device 14 is composed of an air inlet 14-1, a circumferential air chamber 14-3 and four centrally symmetrical air outlets 14-2, as shown in Figure 4 and Figure 5 As shown, this can make the airflow enter the cyclone airflow auxiliary device 14 to form a gathered airflow, so that the upper inlet of the cyclone airflow auxiliary device forms a local negative pressure, which is conducive to the gathering of fibers and falling into the cyclone airflow auxiliary device, so as to achieve the purpose of gathering and thinning the fibers Effect.

Claims (4)

1. A preparation device for functional nanowires, characterized in that: it includes a barrel, a fixed plate, a bolt, a splitter plate, a heating ring, a runner, an adhesion-increasing ring, an airflow-assisted outer cone type electrospinning nozzle, an atomizing device, high voltage electrostatic generator, perforated acrylic plate, electrode plate, receiving roller, cyclone airflow assist device, airflow duct, mixer, regulating valve, flange, air injection device, functional particle A, air pump and functional particle B, barrel It is connected with the splitter plate through the fixed plate by bolts, the outer cylindrical surface of the outer cone airflow duct and the inner cylindrical hole of the splitter plate form a gap, and the melt flows in the gap to make it evenly distributed in the circumferential direction; the airflow assisted outer cone type The electrospinning nozzle and the cyclone airflow auxiliary device are coaxially arranged, and the outer layer is covered with a heating ring; the adhesion-increasing ring is a thin-walled structure, and the adhesion-increasing ring is composed of two parts. The lower part of the ring is made into a cone shape, and the lower part of the tackifying ring is connected to the upper end of the cyclone airflow auxiliary device. There is a vent hole in the middle part of the ring wall of the tackifying ring, and a screen can be arranged near the vent hole of the cyclone airflow assisting device. net; the viscosity-enhancing ring can be adjusted up and down in the axial direction according to the viscosity of the polymer; the air injection device sprays the functional particles A into the mixer and mixes them evenly, then enters the air flow pipeline and evenly adheres to the inside of the fiber bundle; the functional particles B are sprayed on the The outside of the fiber bundle; the electrode plate is connected to the high-voltage electrostatic generator, the receiving roller is placed directly under the electrode plate, and the receiving roller rotates under the drive of the motor. 2. The preparation device of a kind of functional nanowire according to claim 1, characterized in that: the functional particle A and the functional particle B housed in the gas injection device are the same substance or different substances, and are packed in the airflow conduit upper and lower parts. 3. The preparation device of a kind of functional nanowire according to claim 2, characterized in that: the air pump generates high-speed airflow, which is connected to the cyclone airflow auxiliary device and the airflow conduit in the middle of the nozzle through the regulating valve; the cyclone airflow auxiliary device is placed in the belt hole In the middle of the electrode plate, the acrylic plate with holes is fixed to generate a whirlwind, and the functional particles B are evenly attached to the outer surface of the fiber bundle. 4. A preparation device for functional nanowires according to claim 1, characterized in that: the cyclone airflow assisting device is composed of an air inlet, a circumferential air cavity and four centrally symmetrical air outlets.