A device for inhibiting particle sedimentation in electrospinning synthesis and its application

Abstract

The present invention discloses a device and application for inhibiting particle sedimentation in electrostatic spinning synthesis, wherein a syringe is provided, a rotating blade is provided on the axial side of the syringe, a first magnet is placed in the syringe; a second magnet is fixed on at least one blade of the rotating blade; the inclination angle of the rotating blade is 15 to 50 degrees. The device controls the magnetic ball in the syringe to produce a semi-threaded reciprocating motion through magnetic drive, thereby achieving a stirring effect on the reaction solution system, which can effectively avoid the occurrence of solid-phase particle sedimentation in the electrostatic spinning reaction system, effectively maintain the uniformity of the reaction system during the electrostatic spinning operation, and efficiently prepare MIC materials. With the present invention, the object of preparing MIC materials by electrostatic spinning can be expanded to the range of micron-level aluminum powder, greatly enhancing the application prospect of electrostatic spinning technology in the preparation of propellant fuel.

Description

Technical Field

[0001] The present invention relates to a device and application suitable for inhibiting particle sedimentation in electrospinning synthesis. The method can effectively inhibit the sedimentation of solid phase particles of a reaction solution system during the electrospinning process, improve the uniformity of the reaction solution system, and avoid needle clogging. Background Art

[0002] Because of its advantages such as simple operation, low cost and continuous process, the electrospinning method has become one of the main methods for preparing fiber materials. The composite fiber prepared by electrospinning has the characteristics of large specific surface area and high porosity, and is widely used in sensors, photocatalysis and biomedicine. Functionalized composite energetic materials, namely metastable intermolecular complexes (MICs), can be obtained by introducing aluminum powder and energetic oxidants into the fiber matrix through electrospinning technology. In these MIC materials, the components are in close contact, which effectively shortens the reaction distance between molecules, accelerates the reaction rate and mass transfer and heat transfer process of energetic materials, and thus can significantly improve the combustion decomposition rate, energy level and release efficiency of aluminum powder. As a simple and highly versatile technology, the electrospinning process has great potential application value in the preparation of Al-based composite energetic materials. However, for the micron-sized aluminum powder commonly used in the propellant field, the syringe needle is often blocked due to the sedimentation of the micron aluminum powder during the electrospinning process, which makes it difficult to prepare MIC materials based on micron aluminum powder. Summary of the invention

[0003] The purpose of the present invention is to provide a device and application suitable for inhibiting particle sedimentation in electrospinning synthesis. The method can effectively inhibit the sedimentation of solid phase particles in the reaction solution system during the electrospinning process, improve the uniformity of the reaction solution system, and avoid needle clogging.

[0004] In order to achieve the above technical tasks, the present invention adopts the following technical solutions:

[0005] A device for inhibiting particle sedimentation in electrostatic spinning synthesis comprises a syringe, a rotating blade is arranged on the axial side of the syringe, and a first magnet is placed in the syringe; a second magnet is fixed on at least one blade of the rotating blade; and the inclination angle of the rotating blade is 15 to 50 degrees.

[0006] Optionally, the volume of the syringe is 2 to 20 ml, and the inner diameter is 1 to 2 cm; the length of the rotating blade is 1 to 7 cm.

[0007] Optionally, the first magnet is a magnetic ball with a diameter of 3 to 8 mm.

[0008] Optionally, the second magnet is a magnetic column; the two magnetic columns are relatively fixed on both sides of a blade by gluing.

[0009] Optionally, a motor is connected to the rotating blade shaft, and the rotation speed of the motor is 30 to 120 r / min.

[0010] Optionally, the distance between the rotating blade and the outer wall of the syringe is 1 to 3 cm.

[0011] The device for inhibiting particle sedimentation in electrospinning synthesis described in the present invention is used for inhibiting particle sedimentation in electrospinning synthesis. The first magnet forms a first magnet running track in the syringe. The first magnet running track is a semi-threaded reciprocating motion with a reciprocating motion range of 1 to 10 cm.

[0012] Optionally, the outer diameter of the first magnet or the agglomerate formed by multiple first magnets is smaller than 70% of the inner diameter of the syringe.

[0013] Optionally, the motor drives the rotating blades, which drive the second magnet to move along the second magnet's running trajectory. Through the action of magnetic force, the second magnet drives the first magnet in the syringe to move, and sedimentation is avoided through the interaction between the first magnet and the solution system in the syringe.

[0014] Optionally, the running track of the second magnet is circular.

[0015] Compared with the prior art, the present invention has the following advantages and positive technical effects:

[0016] (1) The device of the present invention can effectively avoid the occurrence of solid phase particle sedimentation in the electrospinning reaction system, effectively maintain the uniformity of the reaction system during the electrospinning operation, and efficiently prepare MIC materials.

[0017] (2) In the present invention, the movement trajectory of the magnetic ball in the syringe can be controlled by adjusting the angle between the spiral blades. When the angle is increased, the magnetic ball can be driven to move left and right inside the syringe, while when the angle is reduced, the movement range of the magnetic ball along the length square in the syringe can be increased, so that the magnetic ball can perform a semi-threaded reciprocating motion in the syringe. Compared with the existing method of achieving stirring by magnetically driving the rotor to rotate, the adjustable magnetically driven semi-threaded reciprocating motion in the present invention can more effectively achieve the purpose of solution stirring.

[0018] (3) The existing electrospinning technology for preparing MIC is basically aimed at nano-scale Al powder and other fuels. However, due to inherent disadvantages of nano-Al powder such as low active aluminum content and poor process performance, it is difficult to realize the application in propellant in the short term. With the technical advantages of the present invention, the object of electrospinning to prepare MIC materials can be expanded to the range of micron-scale aluminum powder, greatly enhancing the application prospects of electrospinning technology in the preparation of propellant fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0020] Figure 1 This is a diagram of a device for inhibiting particle settling in electrospinning synthesis according to the present invention;

[0021] The reference numerals in the figure are as follows: 1-syringe, 2-needle, 3-plunger push rod, 4-first magnet, 5-first magnet running track, 6-motor, 7-rotating blade, 8-second magnet, 9-second magnet running track;

[0022] Figure 2 This is a rendering of the device of the present invention used in the preparation of 3μmAl powder electrospinning;

[0023] Figure 3 This is a rendering of the device of the present invention being used in the preparation of 13 μm Al powder electrospinning;

[0024] Figure 4 This is a diagram showing the effect of the device of the present invention being used in the preparation of 40 μm Al powder electrospinning. DETAILED DESCRIPTION

[0025] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0026] The present invention designs a device suitable for inhibiting particle sedimentation in electrospinning synthesis, which is a device that controls the magnetic ball in the syringe to produce a semi-threaded reciprocating motion through magnetic drive, thereby achieving a stirring effect on the reaction solution system. It can effectively avoid the occurrence of solid-phase particle sedimentation in the electrospinning reaction system, effectively maintain the uniformity of the reaction system during the electrospinning operation, and efficiently prepare MIC materials. With the technical advantages of the present invention, the object of electrospinning to prepare MIC materials can be expanded to the range of micron-level aluminum powder, greatly enhancing the application prospects of electrospinning technology in the preparation of propellant fuel. A device that controls the magnetic ball in the syringe to produce a semi-threaded reciprocating motion through magnetic drive, thereby achieving a stirring effect on the reaction solution system. The main components of the device include: a combination of Figure 1Specifically, the syringe 1 is used as a container and filled with a reaction solution system. The needle 2 is connected to the syringe 1 to form a Taylor cone. The first magnet 4 (such as a magnetic ball) is placed inside the syringe 1 as a stirring rotor. The motor 6 is connected to the rotating blade 7, and the rotating blade 7 is driven by the motor 6 to rotate. The second magnet 8 is fixed on at least one blade of the rotating blade 7; the inclination angle of the rotating blade 7 is 15-50°. The second magnet 8 can be set in the form of two cylindrical magnets fixed on one of the rotating blades, and the motor 6 is driven to make the magnet move in a circular motion. The motor 6 with the second magnet 8 and the rotating blade 7 is fixed as a whole on the surface of the lifting platform. The lifting platform controls the vertical height of the magnet so that it is close to the middle position of the syringe 1, and the interval is about 2cm, so that the magnet and the magnetic ball are spaced apart but form an effective magnetic force. The syringe 1 has a volume of 2-15ml and an inner diameter of 1-2cm; the first magnet 4 is a magnetic ball with a diameter of 3-8mm. The rotation speed of the motor 6 is 30-120 r / min, the length of the rotating blades 7 is 1-5 cm, and the blades are at a certain angle with the angle range of 15-50 degrees.

[0027] The present invention also discloses the application of the device for inhibiting particle sedimentation in electrospinning synthesis. The specific scheme of the device is as follows: the motor 6 is fixed on a support frame, the base of the support frame has a certain weight to play a fixing role, and will not be tilted due to the magnetic force, so that the center height of the motor 6 is level with the syringe 1, the rotating blade 7 is installed at the center position of the motor 6, and the cylindrical magnet is adhered to the two sides of a blade by strong glue; according to the different diameters of the magnetic balls, a certain number of magnetic balls are selected and put into the syringe 1, and the syringe is placed in the electrospinning equipment, and the position of the support frame is adjusted so that the second magnet 8 is located in the middle position of the syringe 1 in the length direction, and maintains a distance of 1 to 3 cm from the syringe 1.

[0028] The motor 1 is fixed on the support frame. The base of the support frame has a certain weight and plays a fixing role. It will not be tilted due to the magnetic force. The height of the magnet on the motor 6 is made level with the syringe 1. The motor 6 drives the rotating blade 7 to start rotating. The blade drives the magnet to move around the motor axis in a circular trajectory. Through the magnetic force, the magnet drives the magnetic ball in the syringe to start semi-threaded reciprocating motion inside the syringe 1 along the length direction of the syringe 1. Through the interaction between the magnetic ball and the solution system in the syringe 1, the solid phase particles such as Al powder are continuously stirred to avoid sedimentation.

[0029] The device for suppressing particle sedimentation in electrostatic spinning synthesis of the present invention can be used for preparing metastable intermolecular complexes by electrostatic spinning.

[0030] Embodiment 1:

[0031] This embodiment discloses a device suitable for suppressing particle sedimentation in electrospinning synthesis, such as Figure 1As shown, the inclination angle of the rotating blades in the device is 30°.

[0032] In this embodiment, the reduction motor is fixed on the support frame. The base of the support frame has a certain weight to play a fixing role and will not be tilted due to the magnetic force. The center height of the reduction motor is level with the syringe. The rotating blade is installed at the center of the motor, and the cylindrical magnet is adhered to the two sides of the rotating blade with strong glue; 3 magnetic balls with a diameter of 3mm are selected and placed in the syringe barrel of a 10ml syringe, and the syringe is placed in the electrospinning equipment, and the position of the support frame is adjusted so that the cylindrical magnet is located in the middle position of the length direction of the syringe and maintains a distance of 2cm from the syringe.

[0033] The reduction motor is used to operate at a speed of 30r / min to drive the rotating blades to start rotating. The blades drive the magnet to move around the motor axis in a circular trajectory. Through the action of magnetic force, the magnet drives the magnetic ball in the syringe to start reciprocating motion along the length direction of the syringe inside the syringe. Through the interaction between the magnetic ball and the solution system in the syringe, the solid particles such as Al powder are continuously stirred to avoid sedimentation.

[0034] The specific parameters of the syringe solvent, the number and diameter of the magnetic balls, the speed of the reduction motor, the length of the rotating blades, etc. in the device of the present invention can be adjusted and are not limited to the above-mentioned embodiment.

[0035] Embodiment 2:

[0036] The method of this embodiment uses the device in Example 1 as the object of this experiment. The electrospinning reaction solution system in this embodiment is Al powder with a particle size of 3 μm dispersed in DMF and acetone solvents with a volume ratio of 1:1.

[0037] In this embodiment, three magnetic balls with a diameter of 3 mm are selected and placed inside the syringe. Then, 6 ml of the above reaction solution system is sucked with a 10 ml syringe, and the syringe is placed in the electrospinning device. The support frame is adjusted so that the columnar magnet is located in the middle of the length direction of the syringe and is kept 2 cm away from the syringe. A reduction motor is used to work at a speed of 30 r / min to drive the rotating blade to start rotating. The blade drives the magnet to move around the motor axis in a circular trajectory. Through the action of magnetic force, the magnet drives the magnetic ball in the syringe to start reciprocating motion inside the syringe along the length direction of the syringe. Through the interaction between the magnetic ball and the solution system in the syringe, the solid phase particles such as Al powder are continuously stirred, such as Figure 2 As shown, when the magnetic ball was used to make reciprocating motion in the syringe, after 20 minutes, there was no obvious stratification phenomenon in the reaction system in the syringe, that is, no obvious particle sedimentation occurred; however, when the magnetic ball was not used to make reciprocating motion, after 20 minutes, there was obvious stratification phenomenon in the reaction system in the syringe, that is, obvious particle sedimentation occurred.

[0038] Embodiment 3:

[0039] The method of this embodiment uses the device in Example 1 as the object of this experiment. The electrospinning reaction solution system in this embodiment is Al powder with a particle size of 13 μm dispersed in DMF and acetone solvents with a volume ratio of 1:1.

[0040] In this embodiment, a magnetic ball with a diameter of 8 mm is selected and placed inside the syringe, and then 6 ml of the above reaction solution system is sucked with a 10 ml syringe, and the syringe is placed in the electrospinning device, and the support frame is adjusted so that the columnar magnet is located in the middle of the length direction of the syringe and maintains a distance of 2 cm from the syringe. A reduction motor is used to work at a speed of 30 r / min to drive the rotating blade to start rotating, and the blade drives the magnet to move around the motor axis in a circular trajectory. Through the action of magnetic force, the magnet drives the magnetic ball in the syringe to start reciprocating motion inside the syringe along the length direction of the syringe. Through the interaction between the magnetic ball and the solution system in the syringe, solid phase particles such as Al powder are continuously stirred, such as Figure 3 As shown, when the magnetic ball was used to make reciprocating motion in the syringe, after 20 minutes, there was no obvious stratification phenomenon in the reaction system in the syringe, that is, no obvious particle sedimentation occurred; however, when the magnetic ball was not used to make reciprocating motion, after 20 minutes, almost all the aluminum powder in the reaction system in the syringe settled to the bottom of the syringe.

[0041] Embodiment 4:

[0042] The method of this embodiment uses the device in Example 1 as the object of this experiment. The electrospinning reaction solution system in this embodiment is Al powder with a particle size of 40 μm dispersed in DMF and acetone solvents with a volume ratio of 1:1.

[0043] In this embodiment, two magnetic balls with a diameter of 5 mm are selected and placed inside the syringe, and then 6 ml of the above reaction solution system is drawn with a 10 ml specification syringe, and the syringe is placed in the electrostatic spinning device, and the support frame position is adjusted so that the columnar magnet is located in the middle position of the length direction of the syringe, and the spacing of 2 cm is maintained with the syringe. A reduction motor is used to work at a speed of 30 r / min, and the rotating blade is driven to start rotating. The magnet is driven by the blade to move around the motor axis in a circular trajectory. Through the action of magnetic force, the magnetic ball in the syringe is driven by the magnet to start reciprocating motion along the length direction of the syringe inside the syringe. Through the interaction between the magnetic ball and the solution system in the syringe, the solid phase particles such as Al powder are continuously stirred, as shown in Figure 4, the magnetic ball is used to reciprocate in the syringe. After 20 minutes, there is no obvious stratification phenomenon in the reaction system in the syringe, that is, no obvious particle sedimentation occurs; however, when the magnetic ball is not used to reciprocate, after 20 minutes, almost all aluminum powder in the reaction system in the syringe settles at the bottom of the syringe.

[0044] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0045] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0046] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A device for inhibiting particle sedimentation in electrospinning synthesis, characterized in that: A syringe (1) is provided, a rotating blade (7) is provided on the axial side of the syringe (1), and a first magnet (4) is placed in the syringe (1); A second magnet (8) is fixedly mounted on at least one blade of the rotating blade (7); the inclination angle of the rotating blade (7) is 15 to 50 degrees; The volume of the syringe (1) is 2 to 20 ml, and the inner diameter is 1 to 2 cm; the length of the rotating blade (7) is 1 to 7 cm; The distance between the rotating blade (7) and the outer wall of the syringe is 1 to 3 cm; The first magnet (4) forms a first magnet running track (5) in the syringe (1), and the first magnet running track (5) is a semi-threaded reciprocating motion, and the reciprocating motion range is 1 to 10 cm; The outer diameter of the first magnet (4) or the agglomerate formed by the plurality of first magnets (4) is less than 70% of the inner diameter of the syringe; A motor (6) is axially connected to the rotating blade (7), and the rotation speed of the motor (6) is 30 to 120 r / min. The motor (6) drives the rotating blade (7), and the rotating blade (7) drives the second magnet (8) to move along the second magnet running track (9). Through the action of magnetic force, the second magnet (8) drives the first magnet (4) in the syringe (1) to move, and sedimentation is avoided through the interaction between the first magnet (4) and the solution system in the syringe (1); The second magnet running track (9) is circular.

2. The device for inhibiting particle sedimentation in electrospinning synthesis according to claim 1, characterized in that: The first magnet (4) is a magnetic ball, and the diameter of the magnetic ball is 3 to 8 mm.

3. The device for inhibiting particle sedimentation in electrospinning synthesis according to claim 1 or 2, characterized in that: The second magnet (8) is a magnetic column; The two magnetic columns are fixed relatively on two sides of a blade by gluing.

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