CN110055600B - Electrospinning fiber experimental sample collection control method - Google Patents

Abstract

The application of this division discloses an electrospinning fiber experimental sample collection control method, belong to electrostatic spinning field, in order to solve current electrospinning fiber sample collection device and injection apparatus integral type or only correspond and the unreasonable problem of equipment occupation space that leads to, the landing leg is connected with the horizontal pole and makes the horizontal pole at the flexible upper buckle hand and the lower buckle hand that sets up in opposite directions outside the removal interval of vertical direction at the landing leg, the landing leg that stretches out contracts in the inside inner groovy and reduces the box height, or make the landing leg retract to the inner groovy completely, the palm of two hands is down, the four fingers stretch into in the upper buckle hand, collude the horizontal pole and push up the crossbeam with big thumb, the effect is that the equipment occupation space that leads to is reasonable.

Description

Electrospinning fiber experimental sample collection control method

The application is application number: 201711419135.1, App. 2017-12-25, entitled environmental control method for electrospun fiber sample collection device.

Technical Field

The invention belongs to the field of electrostatic spinning, and relates to a device for collecting an electrospun fiber sample in a constant-humidity and constant-temperature environment.

Background

The electrostatic spinning technology is widely applied to the field of preparation of nanofiber materials. Due to the excellent physical and chemical properties of the nanofiber material, the nanofiber material has wide application fields and infinite development prospects, and various countries are tightening to improve the existing electrostatic spinning technology or develop novel electrostatic spinning equipment. In the electrostatic spinning production process, the charged polymer solution is sprayed, stretched, split, volatilized and solidified in a high-voltage electrostatic field to finally form fibrous characters. There are many parameters that affect the morphology and properties of electrospun fibers, such as the magnitude of the voltage supplied by the high voltage power supply, the distance between the collector plate and the spinning nozzle, the shape and area of the collector plate, the surface tension of the solution, the conductivity, the solubility of the organic solvent in the solution, the viscoelastic force of the solution, the weight of the solution, the flow rate, the temperature and humidity of the environment, and the surrounding magnetic and electric fields, among others. The electrostatic spinning environmental parameters play a decisive role in the electrostatic spinning process, and particularly the temperature and humidity of the electrospinning fiber spraying environment directly influence the production quality of the electrospinning fibers. Most of domestic spinning equipment only measures and controls the ambient temperature of spinning, and occasionally carries out simple manual intervention on the humidity, such as methods of increasing and releasing a drying agent, a dehumidifier and the like. A few foreign high-end electrospinning fiber devices are provided with special temperature and humidity control devices in the spraying environment, but the devices are complex in structure and high in manufacturing cost, and are not beneficial to large-scale popularization and use in China; in the process of spraying the electrospun fibers, part of the electrospun fibers can be scattered to a certain area outside the electrospun fiber collecting plate, the pollution to materials in the next experiment can be caused due to untimely cleaning, and the field cleaning work after the experiment is finished can occupy a large amount of time for scientific research personnel due to disordered electrospinning scattering; and the laboratory space is tense in the scientific research experiment process, and because the spraying is disordered, only one electrospinning fiber device can work in one area, and the factors seriously influence the efficiency of the scientific research experiment.

Disclosure of Invention

In order to solve the problem that the existing electrospinning fiber sample collecting device and the spraying device are integrated or only corresponding to each other, so that the occupied space of equipment is unreasonable, the invention provides the following scheme: an environment control method of an electrospinning fiber sample collecting device comprises the steps of enabling a supporting platform to be matched and connected with a slide way on the bottom surface of a box body; the method comprises the steps of adjusting the telescopic supporting legs; a step of conducting air to maintain a constant temperature and humidity environment; a step of electrospinning fiber spraying; there is the step of obtaining electrospun fibers.

Has the advantages that: the invention uses the box body as a sample collecting device, the upper top surface of the box body is provided with the rubber pad, the rubber pad is provided with the needle hole for inserting the electrospinning fiber injection needle into the box body, the bottom surface of the rubber pad is provided with the metal slideway, the supporting platform is a cylindrical metal body, the bottom of the supporting platform is provided with the sliding chute matched with the metal slideway on the bottom surface of the box body so as to enable the supporting platform to be connected with the metal slideway in a sliding way, the separation and combination of the injection device and the collecting device are realized, and the constant-humidity constant-temperature air source is used to maintain the stability of the closed environment under the separated structure.

Drawings

FIG. 1: schematic diagram of electrospinning fiber injection;

FIG. 2: a schematic of an electrospun fiber sample collection device;

FIG. 3: the structure schematic diagram of the pallet;

FIG. 4: the structure schematic diagram of the telescopic supporting leg;

FIG. 5: the schematic diagram of the telescopic supporting leg and the upper and lower clasps in matched telescopic manner;

FIG. 6: a schematic representation of an electrospun fiber sample collection device.

Wherein: 1. the constant-temperature and constant-humidity air source comprises a constant-temperature and constant-humidity air source body 2, a box body 3, an air inlet valve 4, an exhaust valve 5, a rubber pad 6, an electrode jack 7, a side door 8, a side door handle 9, a supporting leg 9, a locking knob 10, an upper buckle handle 11, a lower buckle handle 12, a cross rod 13, an inner groove 15, a lifting platform 16, a supporting platform 17, a table top 18, an annular shallow groove 19 and a sliding groove 19.

Detailed Description

Example 1: the embodiment provides an electrospun fiber sample collecting device, which can be used for scientific research more and is used as a low-cost electrospun fiber experimental sample collecting device. The collecting device comprises a constant-temperature and constant-humidity air source, a box body, an air inlet valve, an air outlet valve, a rubber pad, a supporting platform, a slideway, an electrode jack, a side door, a buckle, a telescopic U-shaped supporting leg and the like.

The constant temperature and humidity air source is a universal device in the control field, and can output air outwards through a pipeline, and the temperature, the humidity and the flow of the air are adjustable. The box body is a rectangular space made of an acrylic material. The acrylic material has low cost, is convenient to process, has good sealing property, is transparent and convenient to observe, and can customize rectangular spaces with various sizes according to the electrospinning experimental requirements. The bottom of the box body is provided with a slide way, and a temperature and humidity meter convenient for external observation is arranged in the box body. The air inlet valve is connected with a constant temperature and humidity air source through a pipeline. Before the experiment, the air-conditioning device is used for introducing constant-temperature and constant-humidity air into the box body. The exhaust valve plays a one-way air guide role and is used for emptying the original air in the box body by matching with the air inlet valve before the experiment begins. The rubber pad is located directly over the box and is circular elastic rubber material, and the middle of the rubber pad is provided with a hole with a small diameter for inserting the electrospinning fiber injection needle into the box. The supporting platform is a cylindrical metal body and is used for collecting the electro-spinning fibers sprayed by the needle head, and the collecting platforms with different diameters and heights are used for experimental selection. An annular shallow groove is arranged at a position 1 cm below the periphery of the table top of the supporting table and used for fixedly covering the tin foil on the table top. The bottom of the supporting platform is provided with a through sliding chute (the sizes of the sliding chutes of the supporting platforms of various types are uniform) for being fixed with the sliding chute at the bottom of the box body. The slide is installed in the bottom of box, is the electrically conductive metal material, is used for fixed saddle. The electrode jacks are connected with a metal slideway in the box body, so that the positive and negative voltage of the injection needle head of the electro-spinning fiber is ensured to be formed by the supporting platform. The side door sets up in one side of box, is convenient for get, put the saddle, is convenient for wash the incasement impurity after the experiment finishes.

The telescopic supporting legs are made of aluminum alloy materials, two groups of four feet and two U-shaped structural designs, each foot bottom is provided with a plane ring for opening the stable support, the supporting legs are installed in the front and the rear sliding grooves of the outer part of the box body, namely, the inner grooves formed in the thicker box body surface are matched with the upper and lower buckles for use, so that the two groups of supporting legs can move up and down to realize the manual adjustment of the height position of the box body. The two sides of each group of supporting legs are provided with locking knobs, and when the height of the box body meets the requirement, the supporting legs are locked to realize reliable support of the box body. Each supporting leg is provided with an obvious scale mark, and the size of the supporting leg extending out of the box can be recorded. In one scheme, the telescopic supporting legs can be replaced by a lifting platform which is a universal device and can stably bear the box body and realize height adjustment of the position. Or the telescopic legs and the lifting platform are used simultaneously in the collecting device.

In an embodiment, a collection method of an electrospun fiber sample collection device is described, because a positive voltage and a negative voltage are formed between a spraying needle and a collection plate in a conventional electrospun fiber experimental device, an electrically-charged electrospun solution is sprayed from the spraying needle and falls on the collection plate, as shown in fig. 1, and due to the factors that the environmental temperature and humidity are not controllable, the spraying of impurities in electrospun fibers pollutes the environment, and the like, the experimental quality and the experimental efficiency of electrospun fibers cannot meet the requirements. In the method, before the experiment is started, boxes (box width and height) and supporting platforms (cylinder height and table diameter) with different sizes are selected according to the characteristics of electrospun fiber materials and the spraying requirements, a piece of tinfoil is covered on the supporting platform, the tinfoil is folded along the table, and the tinfoil is fixed in an annular wire slot below the table by a string. The bottom of the tray table is provided with a through chute (the chutes of various types of tray tables are uniform in size), the tray table is fixed at the bottom of the box body along a slide way at the bottom of the box body, and the side door of the box body is closed. After the supporting platform is fixed, the box body is placed on the table top, the electrospinning fiber injection needle head is enabled to be right opposite to the center of the rubber pad, 4 locking knobs are loosened, the length of the double-U-shaped telescopic supporting leg extending out of the box body is manually adjusted, and when the needle head is just inserted into the hole in the center of the rubber pad, the locking knobs lock the double-U-shaped supporting leg to fix the height of the box body. The electrode jack is connected with the negative electrode of a high-voltage power supply by a power line, and the electrode jack is connected with the metal slide way in the box body, and the injection needle of the electrospun fiber is connected with the positive electrode of the power supply, so that positive and negative voltages for promoting the injection of the electrospun fiber are formed between the supporting platform and the needle. A pipeline of a constant-temperature and constant-humidity air source is connected with an air inlet valve of a box body, the air temperature, humidity and flow are adjusted according to experiment requirements, an exhaust valve is opened while the box body is inflated to exhaust original air in the box body, the exhaust valve and the air inlet valve are respectively closed after 1-2 minutes, and the temperature and the humidity of the air in the box body just meet the experiment requirements. After the above preparation work is completed, the experiment can be started. Because the box body has good sealing performance and no interference between the box bodies, a plurality of injection needles and a plurality of box bodies can be arranged in the experimental space, and the electrospinning fiber injection experiment of different materials can be carried out simultaneously. The acrylic material is transparent and convenient for external observation, and in the electrospinning jet experiment process, experimenters can check the jet condition and the environmental temperature and humidity of each device in real time, and can continue to inflate the box body through a constant-temperature constant-humidity air source if the temperature and humidity change is obvious. After the electrospinning fiber injection experiment is finished, 4 locking knobs are loosened, the double-U-shaped telescopic supporting legs are retracted into the box, and then 2 groups of supporting legs are locked again. And opening the side door, taking out the supporting platform according to the slide way, and cutting off the thin rope to obtain an electrospinning fiber sample on the tinfoil for the next research. Because the box body has good sealing performance, no material pollution exists in the experimental environment, a new box body is replaced, the experimental parameters are adjusted, a plurality of electrospinning fiber experiments can be immediately developed in situ, and the time delay caused by cleaning the experimental device and cleaning the experimental environment is avoided. The used box body can be repeatedly used after being cleaned and dried.

The collecting device and the collecting method can meet the temperature and humidity requirements of the electrospinning fiber spraying environment at extremely low cost, realize zero pollution of the spraying environment, realize simultaneous work of a plurality of electrospinning devices in a small space, and have the advantages of simple operation, stable operation and the like. Is very suitable for being popularized in units such as universities and colleges, research institutes and the like. Through the simple and practical mechanical structure design, the temperature and humidity of the electrospinning fiber spraying experimental environment can be adjusted with extremely low cost, zero pollution of the electrospinning fiber spraying experimental environment is realized, multiple electrospinning devices can work simultaneously in a small space without interference, and the electrospinning fiber spraying experimental efficiency and experimental stability are improved to a great extent.

Example 2: an electrospun fiber sample collection device comprises a hollow rectangular box body and a supporting platform, wherein an air inlet valve and an exhaust valve are correspondingly arranged on the box body, the air inlet valve is connected to a constant-humidity constant-temperature air source machine to supply air to the interior of the box body, a rubber pad is arranged on the top surface of the box body, the rubber pad is provided with a needle hole for inserting an electrospun fiber injection needle into the box body, a metal slide way is arranged on the bottom surface of the rubber pad, the supporting platform is a cylindrical metal body, and a sliding groove matched with the metal slide way on the bottom surface of the box body is formed in the bottom of the supporting platform so that the supporting platform can be slidably connected to the metal slide way; the electrode jack on the box body is connected with the metal slideway, the electrode jack is connected with the negative pole of a high-voltage power supply through a power cord, and the injection needle of the electrospun fiber is connected with the positive pole of the high-voltage power supply.

The electrospinning fiber equipment which is integrated with the spraying device or only corresponds to the spraying device can be larger in collecting device, and occupied space can be larger in order to adapt to collection of various samples, various specifications and the like. Therefore, the scheme is used as a separated collecting device and can be adapted to a spraying device, namely a rubber pad is arranged on the top surface of a box body, the rubber pad is provided with a pinhole for inserting an electrospinning fiber spraying needle head into the box body, the spraying and the collecting can be separated and assembled through the arrangement of the pinhole, the damage of the collecting device can not influence the spraying device, the collecting device does not need to be assembled with the spraying device when not used, no larger space is occupied, and in addition, the collecting device with reasonable size can be selected when in experiments, no overlarge space can be occupied in the experiment process, on the other hand, the bottom surface of the collecting device is provided with a metal slide way, the support table is a cylindrical metal body, the bottom of the support table is provided with a sliding groove matched with the metal slide way on the bottom surface of the box body so as to be slidably connected with the metal slide way, the structure enables the collected box body to be separated, the invention has the advantages that the structure formed by separation is skillful, the standard applicability under the unified specification can be ensured by matching the sliding groove and the sliding way, the sliding connection is stable during connection, the transverse sliding is not required to be disassembled, the assembly is convenient, the bottom surface and the sliding structure of the embodiment of the sliding structure can be well protected from splashing spinning, and the failure of an assembly mechanism caused by spinning splashing can be avoided.

In one scheme, the electrospun fiber sample collection device further comprises a telescopic supporting leg, the telescopic supporting leg is provided with two supporting legs, two opposite side surfaces of the box body with a certain thickness are respectively provided with an inner groove in which the supporting legs stretch, the cross rod is connected with the two supporting legs through a connecting rod so as to form a horizontal distance with the side surfaces where the cross rod is located, and the telescopic supporting leg is provided with a locking knob which enables the supporting legs to be locked in the inner grooves at a certain length.

The telescopic supporting leg is introduced, on the basis that the spraying and collecting devices are separable and can be assembled, in order to make any collecting device be suitable for spraying needles at different heights so as to match in the vertical direction, the innovation is made, the structural design of the telescopic supporting leg is as compact as possible, an inner groove is formed in the outer surface of the box body, so that the supporting leg and the box body are integrated after being used, the structure is compact, the occupied space is small, and the operation is very easy.

In one arrangement, the lower end of the leg has a support pad or ring to support the platform when the leg extends from the inner recess. Its purpose is for better when the landing leg is flexible, can stable support.

In one scheme, the supporting legs are connected with the cross rod, and the upper buckling handle and the lower buckling handle are arranged outside a moving range of the cross rod in the vertical direction in an opposite mode when the supporting legs stretch out and draw back. Its purpose is because flexible landing leg is integrated in the box, during flexible, in order to be more convenient, accomplishes alone, and then sets up upper and lower mouthful of hand to it is more convenient to the flexible control of landing leg.

In one scheme, an annular shallow groove is arranged below the periphery of the table board of the supporting table, and the tinfoil covered on the table board is fixed on the annular shallow groove by using a rope. Its purpose is in order to further guarantee the clean and tidy and can use repeatedly of saddle.

In one scheme, one side face of the two opposite side faces of the telescopic supporting leg is not arranged, and the side face is an entering side door which enables the supporting platform to enter the box body and is matched with the bottom metal slide way. The other side surface of the two opposite side surfaces of the telescopic supporting leg is not arranged, and the side door is separated from the bottom surface metal slideway by the supporting platform leaving the inside of the box body. The inlet side door and the separation side doors are arranged and can be the same door or different doors, when the inlet side doors and the separation side doors are not the same door, a plurality of collecting devices can be transversely combined, namely in one scheme, the electrospun fiber sample collecting devices are arranged, the first collecting devices and the second collecting devices are removed, and the separation side doors of the collecting devices correspond to the inlet side doors of the downstream collecting devices. The method aims to realize necessary time-sharing spraying on one machine for collecting different spinning samples, consumes a large amount of time for batch collection, and can save a large amount of time by adopting a transverse time-sharing and time-sharing process. Naturally, the electrospun fiber sample collection device can also be arranged in a longitudinally stacked arrangement. And in order to facilitate the observation of the spinning process, the box body is made of transparent acrylic materials.

In one scheme, the collecting device further comprises a lifting platform which is detachably arranged below the box body, and the lifting platform lifts the box body along with the lifting platform so that the electrospinning fiber spraying needle head is inserted into the needle hole of the rubber pad. Namely, a similar structural deformation is made for the lifting of the telescopic leg.

In one embodiment, it describes a method for environmental control of an electrospun fiber sample collection device, in effect a method for collection of an electrospun fiber sample collection device: the step of matching and connecting the tray table with the slideway on the bottom surface of the box body; the method comprises the steps of adjusting the telescopic supporting legs; a step of conducting air to maintain a constant temperature and humidity environment; a step of electrospinning fiber spraying; there is the step of obtaining electrospun fibers.

The steps of adjusting the telescopic legs are as follows: when the height of the box body needs to be increased, the screwing knob is unscrewed, so that the supporting legs can move in the inner grooves on the side faces of the box body to extend out of the inner grooves, and when the required height is reached, the screwing knob is screwed to fix the supporting legs extending out of the inner grooves. The landing leg is connected with the horizontal pole and makes the horizontal pole in the last attacker and the lower attacker of the outer relative setting of removal interval of vertical direction at the landing leg is flexible, stretches out the landing leg downwards in order to promote the box height in the inner groovy, and two hands palm is up, and during four fingers stretched into lower attacker, collude the horizontal pole with big thumb and push down the crossbeam.

When the height of the box body needs to be reduced, the screwing knob is unscrewed, so that the supporting legs extending out of the inner grooves can retract into the inner grooves in the side faces of the box body, and when the required height is reached or the supporting legs completely retract into the inner grooves, the screwing knob is screwed to fix the supporting legs. The landing leg is connected with the horizontal pole and makes the last attacker and the lower attacker of horizontal pole outside the removal interval of vertical direction setting in opposite directions at the landing leg is flexible, and the landing leg that stretches out is retracted in the inside inner groovy in order to reduce the box height, or makes the landing leg retract to the inner groovy completely, and two palms palm is down, and during four fingers stretched into the attacker, colluded the horizontal pole and push up the crossbeam with the big thumb.

Guiding air to maintain a constant temperature and humidity environment: the pipeline of the constant temperature and humidity air source is connected with the air inlet valve of the box body, the temperature and the humidity of the air are adjusted according to experiment requirements, the exhaust valve is opened to exhaust the original air in the box body while the box body is inflated, and the exhaust valve and the air inlet valve are respectively closed after a period of time, so that the temperature and the humidity of the air in the box body meet the experiment requirements.

Obtaining an electrospun fiber sample: the electrospinning fiber spraying was completed so that the electrospun fiber samples were collected as tinfoil covered on the pallet, the pallet was removed from the box, and the tinfoil was separated from the pallet.

The above description is only for the purpose of creating a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

Claims (1)

1. The method for collecting and controlling the electrospinning fiber experimental sample is characterized by comprising the steps of enabling a supporting platform to be connected with a slide way on the bottom surface of a box body in a matched mode; the method comprises the steps of adjusting the telescopic supporting legs; a step of conducting air to maintain a constant temperature and humidity environment; a step of electrospinning fiber spraying; having a step of obtaining an electrospun fiber; when the height of the box body needs to be reduced, the screwing knob is unscrewed, so that the supporting legs extending out of the inner grooves can retract into the inner grooves on the side surfaces of the box body, and when the required height is reached or the supporting legs completely retract into the inner grooves, the screwing knob is screwed to fix the supporting legs; the landing leg is connected with the cross bar, the landing leg is extended and contracted to enable the cross bar to oppositely arrange an upper buckle hand and a lower buckle hand outside a moving interval in the vertical direction, the extended landing leg retracts towards an inner groove to reduce the height of the box body, or the landing leg retracts into the inner groove completely, the palm of two hands faces downwards, four fingers extend into the upper buckle hand, the cross bar is hooked by a big thumb and a cross beam is pushed upwards, when the height of the box body needs to be reduced, a screwing knob is unscrewed, the landing leg extending out of the inner groove can retract into the inner groove on the side surface of the box body, when the required height is reached or the landing leg retracts into the inner groove completely, the screwing knob is screwed to fix the landing leg, and the air is guided to maintain the constant temperature and humidity environment, and after a period of time, the exhaust valve and the air inlet valve are respectively closed, so that the temperature and the humidity of the air in the box body meet the experimental requirements.

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