KR102575879B1 - Electrostatic unit, multifunctional electrostatic adhesion device including the same and manufacturing method of the same - Google Patents

Abstract

An electrostatic unit according to an embodiment of the present invention includes a dielectric elastic tube having flexibility and elasticity, a flexible conductor filled in the dielectric elastic tube, and a power supply unit connected to the flexible conductor. In particular, since the electrostatic unit of one example of the present invention has flexibility and elasticity, when used in a multifunctional electrostatic bonding device, adhesion may be improved and a self-cleaning function may be realized.

Description

Electrostatic unit, multifunctional electrostatic adhesive device including the same, and manufacturing method of the electrostatic unit

The present invention relates to an electrostatic unit, a multifunctional electrostatic adhesive device including the same, and a method for manufacturing the electrostatic unit.

Adhesion refers to a state in which different materials are maintained by bonding force between interfaces. Adhesion includes chemical adhesion, mechanical adhesion, and electrostatic adhesion. Chemical adhesion refers to bonding between interfaces by intermolecular forces, mechanical adhesion refers to adhesion to each other by mechanical shapes such as anchors, and electrostatic adhesion uses the property of attracting negative and positive charges to each other. means that

In the case of chemical adhesion, the adhesive strength is determined according to the type of adhesive composition, and it is virtually impossible to actively change the adhesive strength once determined. Even in the case of mechanical adhesion, it is possible to change only the presence or absence of adhesion, and in particular, since it must have a specific structure, the adhesion target is inevitably limited. In comparison, electrostatic adhesion has the advantage of being able to actively control the adhesive force.

However, electrostatic adhesion has a low adhesive strength, and there is a problem in that the adhesive strength is further deteriorated when contaminants are attached during use. Therefore, there is a need for a new method that can simultaneously solve these problems.

One object of the present invention is to provide an electrostatic unit capable of using a self-cleaning multifunctional electrostatic bonding device with improved adhesion and a method for manufacturing the same, and furthermore, to provide a multifunctional electrostatic bonding device using such an electrostatic unit. aims to

Meanwhile, other unspecified objects of the present invention will be additionally considered within the scope that can be easily inferred from the following detailed description and effects thereof.

To achieve the above object, an electrostatic unit according to an embodiment of the present invention includes a dielectric elastic tube having flexibility and elasticity, a flexible conductor charged in the dielectric elastic tube, and a power supply unit connected to the flexible conductor.

In one example, the dielectric elastomer tube may be an acrylic dielectric elastomer or a silicone dielectric elastomer.

In one example, the flexible conductor is an ionic conductor made of hydrogel, organogel, ionogel, and ionoelastomer, carbon nanotube, and graphene. A carbonaceous conductor made of (graphene) and an elastic composite containing at least one of the carbonaceous conductors, a liquid composed of mercury (Hg), gallium (Ga), cesium (Cs), rubidium (Rb) and francium (Fr) It may be characterized in that it is selected from the group consisting of a metal and an elastic composite containing at least one of the liquid metal.

In one example, it may be characterized in that fine wrinkles or fine cracks are formed on the outer surface of the dielectric elastic tube.

In one example, an antifouling layer may be further formed on an outer surface of the dielectric elastic tube.

In order to achieve the above object, a multifunctional electrostatic bonding device according to another embodiment of the present invention includes a first electrostatic unit and a second electrostatic unit that are elongated in one direction. The first electrostatic unit includes a first dielectric elastic tube having flexibility and elasticity, a first flexible conductor charged in the first dielectric elastic tube, and a first power supply unit connected to the first flexible conductor. The second electrostatic unit includes a second dielectric elastic tube having flexibility and elasticity, a second flexible conductor filled in the second dielectric elastic tube, and a second power supply unit connected to the second flexible conductor, The elastic tube and the second dielectric elastic tube are disposed to face each other.

In another example, the first power unit is DC power, and when DC power is applied to the first flexible conductor by the first power unit, the first electrostatic unit and the second electrostatic unit have electrostatic adhesion. can be characterized.

In another example, the first and second dielectric elastic tubes of the first electrostatic unit and the second electrostatic unit may be in a tensioned state.

In another example, the first power supply unit is AC power, and when AC power is applied to the first flexible conductor by the first power supply unit, the first electrostatic unit and the second electrostatic unit move closer to each other and then move away from each other. It may be characterized in that it is self-cleaning by vibrating while repeating.

In another example, a voltmeter is installed in the first power supply unit, and the voltmeter detects a voltage that changes when an object is adjacent to the first dielectric elastic tube, thereby sensing the approaching and moving away of the object. can

To achieve the above object, a method of manufacturing an electrostatic unit according to another embodiment of the present invention includes preparing a dielectric elastic tube; and filling the dielectric elastic tube with a flexible conductor.

In another example, the preparing of the dielectric elastic tube may include forming fine wrinkles or microcracks on an outer surface of the dielectric elastic tube by stretching the dielectric elastic tube and performing an oxygen plasma treatment or an ozone treatment. It can be characterized as being carried out.

In another example, in the step of preparing the dielectric elastic tube, an antifouling layer may be formed on the surface of the dielectric elastic tube by immersing the dielectric elastic tube in an antifouling agent diluted in a solvent.

An electrostatic unit according to an embodiment of the present invention includes a dielectric elastic tube having flexibility and elasticity, a flexible conductor filled in the dielectric elastic tube, and a power supply unit connected to the flexible conductor. Since the electrostatic unit according to an example of the present invention has flexibility and elasticity, when used in a multifunctional electrostatic bonding device, adhesion may be improved and a self-cleaning function may be implemented.

On the other hand, even if the effects are not explicitly mentioned here, it is added that the effects described in the following specification expected by the technical features of the present invention and their provisional effects are treated as described in the specification of the present invention.

1 is a schematic perspective view of an electrostatic unit according to an embodiment of the present invention.
FIG. 2 is a photograph of an electrostatic unit according to an embodiment of the present invention, which is an electrostatic unit composed of a contamination-prevented dielectric elastic tube and an ionic electrode.
3 is a strain-stress graph of the electrostatic unit of FIG. 2;
4 is a schematic flowchart of a method of manufacturing an electrostatic unit according to another embodiment of the present invention.
5 is a reference diagram for explaining the configuration and operation of a multifunctional electrostatic bonding device according to another embodiment of the present invention.
6 is a multifunctional electrostatic bonding device according to another embodiment of the present invention (a) adhesion according to the type of object, (b) change in adhesion according to the tension of the dielectric elastic tube filled with flexible conductor, (c) This is a picture taken of actually bonding a heavier object according to the tension of the dielectric elastic tube filled with flexible conductor.
FIG. 7 is a reference diagram for explaining sensing a change in distance to an object using a multifunctional electrostatic bonding device according to another embodiment of the present invention.
8 is a result of measuring sensitivity according to the size of a resistance connected to a voltmeter as a sensor for detecting a change in distance in a multifunctional electrostatic adhesive device according to another embodiment of the present invention.
FIG. 9 is a multifunctional electrostatic adhesive device according to another embodiment of the present invention measuring the function of a sensor for detecting a change in distance, and showing a change in voltage measured according to a change in the actual distance of an object (glass). will be.
10 is a reference diagram for explaining self-cleaning using a multifunctional electrostatic adhesive device according to another embodiment of the present invention.
11 is a graph for examining the effect of input frequency on the self-cleaning function using a multifunctional electrostatic adhesive device according to another embodiment of the present invention.
12 is a measurement of recovery of adhesive strength as self-cleaning is performed using a multifunctional electrostatic adhesive device according to another embodiment of the present invention.
FIG. 13 is a reference diagram for explaining that a multifunctional electrostatic bonding device according to another embodiment of the present invention performs various operations such as self-cleaning, distance change detection, adhesion and detachment.
It is revealed that the accompanying drawings are illustrated as references for understanding the technical idea of the present invention, and thereby the scope of the present invention is not limited thereto.

Hereinafter, with reference to the drawings, look at the configuration of the present invention guided by various embodiments of the present invention and the effects resulting from the configuration. In the description of the present invention, if it is determined that a related known function may unnecessarily obscure the subject matter of the present invention as an obvious matter to those skilled in the art, the detailed description thereof will be omitted.

1 is a schematic perspective view of an electrostatic unit according to an embodiment of the present invention, and FIG. 2 is a photograph of the electrostatic unit according to an embodiment of the present invention, which is an electrostatic unit composed of a dielectric elastic tube and an ionic electrode to prevent contamination. ,

Referring to FIGS. 1 and 2 , an electrostatic unit according to an embodiment of the present invention will be described.

The electrostatic unit of the present invention includes a dielectric elastic tube (10) and a flexible conductor (20). The dielectric conductor 20 is connected to a power source (not shown).

The dielectric elastic tube 10 may be a tube-shaped tube elongated in one direction or a flat-plate tube. When the dielectric elastic tube 10 is a tubular tube, the cross section of the tube may be circular or rectangular, but the present invention is not limited thereto. In addition, when the dielectric elastic tube 10 is a flat tube, the flat sheet may have a circular or polygonal shape in plan view, but the present invention is not limited thereto.

The dielectric elastic tube 10 is characterized by having flexibility and elasticity. In particular, the electrostatic unit of the present invention may use a dielectric elastic tube 10 having elasticity that can be stretched by 50% or more. For example, an acrylic dielectric elastomer or a silicon dielectric elastomer may be used as the dielectric elastomer tube 10 .

A flexible conductor 20 is filled in the dielectric elastic tube 10 . The flexible conductor 20 has a property of maintaining conductivity regardless of expansion or deformation of the dielectric elastic tube 10 . In addition, the flexible conductor 20 is stretched together when the dielectric elastic tube 10 is stretched, stretched together when stretched and contracted, and deformed together when deformed. For example, the flexible conductor 20 includes an ionic conductor made of hydrogel, organogel, ionogel and ionoelastomer, carbon nanotube and graphene ( A liquid metal made of mercury (Hg), gallium (Ga), cesium (Cs), rubidium (Rb), and francium (Fr) And it can be used that is selected from the group consisting of an elastic composite containing at least one of the liquid metal.

DC power, AC power, or ground power may be connected to the power supply unit connected to the dielectric conductor 20 . Alternatively, it is also possible to install a voltmeter together with a resistor in the power supply unit.

The electrostatic unit of the present invention is composed of a dielectric elastic tube 10 filled with a flexible conductor 20. When DC power is applied to the flexible conductor 20 to the power supply unit, polarization occurs across the dielectric elastic tube. On the contrary, it can function as a sensor by detecting the potential difference that changes when an object approaches or moves away from the flexible elastic tube 10) using a voltmeter.

3 is a strain-stress graph of the electrostatic unit of FIG. 2; Referring to FIG. 3 , it can be seen that in the electrostatic unit of the present invention, the dielectric elastic tube 10 filled with the flexible conductor 20 is deformed by an external force.

Since the electrostatic unit of the present invention uses the dielectric elastic tube 10 filled with the flexible conductor 20, the dielectric elastic tube 10 can be stretched, thereby improving the adhesive strength of a multifunctional electrostatic bonding device described later. can In addition, the electrostatic unit of the present invention uses the elasticity of the dielectric elastic tube 10 filled with the flexible conductor 20, so that a self-cleaning function can be realized in a multifunctional electrostatic adhesive device described later.

Meanwhile, in order to enhance the self-cleaning function, micro wrinkles or micro cracks may be formed on the outer surface of the dielectric elastic tube 10 of the electrostatic unit of the present invention. Micro wrinkles or micro cracks formed on the outer surface of the dielectric elastic tube 10 improve water repellency, helping foreign substances to fall off more easily. Furthermore, since the antifouling layer 11 is further formed on the outer surface of the dielectric elastic tube 10 of the electrostatic unit of the present invention, the self-cleaning function can be further improved. As the antifouling layer 11, (heptadecafluoro-1,1,2,2-tetrahydrodecyl) trichlorosilane may be used, but the present invention is not limited thereto.

4 is a schematic flowchart of a method of manufacturing an electrostatic unit according to another embodiment of the present invention.

A manufacturing method of an electrostatic unit according to another embodiment of the present invention includes preparing a dielectric elastic tube and filling the dielectric elastic tube with a flexible conductor. In the step of preparing the dielectric elastic tube, a step of forming fine wrinkles or microcracks on the outer surface of the dielectric elastic tube by stretching the dielectric elastic tube and performing oxygen plasma treatment or ozone treatment may be performed. there is. In addition, in the step of preparing the dielectric elastic tube, a step of forming an antifouling layer on the surface of the dielectric elastic tube by immersing the dielectric elastic tube in an antifouling agent diluted in a solvent may also be performed.

Referring to FIG. 4 , an embodiment of a manufacturing method of an electrostatic unit according to the present invention is as follows.

First, a dielectric elastomer tube is prepared. A silicone dielectric elastomer was used as the dielectric elastomer tube. The prepared dielectric elastic tube was stretched and oxygen plasma treatment was performed. After that, when the tension is released, fine wrinkles or fine cracks are formed on the surface of the dielectric elastic tube. Then, an antifouling agent (heptadecafluoro-1,1,2,2-tetrahydrodecyl trichlorosilane) was diluted in hexane at a ratio of 1000:1, and the dielectric elastic tube with fine wrinkles and microcracks was formed in the diluted antifouling agent. soak it Through this process, an antifouling layer is formed on the surface of the dielectric elastic tube. After performing the antifouling coating, a flexible conductor is filled in the dielectric elastic tube. In this embodiment, an ionic electrode solution was injected and cross-linked by irradiation of ultraviolet rays with a wavelength of 365 nm in a nitrogen atmosphere. In this way, an electrostatic unit as shown in FIG. 2 was manufactured.

5 is a reference diagram for explaining the configuration and operation of a multifunctional electrostatic bonding device according to another embodiment of the present invention.

A multifunctional electrostatic catching device according to another embodiment of the present invention is composed of a first electrostatic unit 101 and a second electrostatic unit 102 . DC power may be connected to the first power supply unit of the first power failure unit 101, and DC power may be connected to the second power supply unit of the second power supply unit 102 with ground power or DC power opposite to that of the first power supply unit. The first electrostatic unit 101 and the second electrostatic unit 102 are formed long in one direction and are disposed to face each other. Here, being arranged to face means that they are arranged so that electrons do not directly move to each other like two electrodes of a capacitor.

As shown in the left figure of FIG. 5, in a state where power is not applied, cations and anions (or positive and negative charges) are generated in the first and second flexible conductors of the first electrostatic unit 101 and the second electrostatic unit 102. They are placed in a balance of charges. When DC power is applied, positive ions (or positive charges) or negative ions (or negative charges) are attracted and polarized to the first power supply unit as shown in the central figure of FIG. The flexible conductor is also polarized under the influence of the polarization of the first flexible conductor. At this time, when the object P is brought close to the first dielectric elastic tube and the second dielectric elastic tube, an electrostatic attraction is generated and the object P is bonded.

6 is a multifunctional electrostatic bonding device according to another embodiment of the present invention (a) adhesion according to the type of object, (b) change in adhesion according to the tension of the dielectric elastic tube filled with flexible conductor, (c) This is a picture taken of actually bonding a heavier object according to the tension of the dielectric elastic tube filled with flexible conductor.

As shown in FIG. 6(a), the electrostatic bonding device according to another embodiment of the present invention has the advantage of being capable of bonding not only metals, ceramics and polymers, but also natural objects such as leaves.

Referring to FIGS. 6(b) and (c), when the first dielectric elastic tube and the second dielectric elastic tube are stretched, adhesion is improved. When the first dielectric elastic tube and the second dielectric elastic tube were not tensioned, the metal plate could be vertically bonded with a maximum of 6.8g. Metal plates weighing up to 13.6 g could be bonded vertically. This is an increase in the weight that can be bonded nearly twice. The reason why the adhesive strength of the dielectric elastic tube filled with the flexible conductor increases during tension is that the thickness of the dielectric elastic tube becomes thinner due to the tension and the interval between adjacent flexible conductors becomes closer. As a result, the distance between the positive charge (or cation) and the negative charge (or anion) induced in each flexible conductor becomes closer, forming a stronger electric field and making it possible to bond heavier objects.

FIG. 7 is a reference diagram for explaining sensing a change in distance to an object using a multifunctional electrostatic bonding device according to another embodiment of the present invention.

Referring to FIG. 7 , a voltmeter may be installed in the first electrostatic unit 101 of the multifunctional electrostatic adhesive device according to another embodiment of the present invention. When the object P approaches the first dielectric elastic tube of the first electrostatic unit 101, a charging phenomenon occurs in which electrons are attracted to a side having a higher electron affinity between the object and the electrostatic unit. Since a voltage is induced when a charged object approaches the element, a resistor is installed in the first power supply part of the first electrostatic unit 101, and a voltmeter is installed in the resistance to measure the voltage change, so that the object moves to the first electrostatic unit (101). 101) can be detected as approaching or moving away.

8 is a result of measuring the sensitivity of a multifunctional electrostatic adhesive device according to another embodiment of the present invention as a sensor for detecting a change in distance. Referring to FIG. 8, the sensitivity of the sensor is insufficient to detect the position of an object in a non-contact method when the resistance level is kΩ to MΩ, but the multifunctional electrostatic adhesive device according to another embodiment of the present invention has a resistance of 1 GΩ or more. This has the effect of maximizing the sensitivity of the sensor.

FIG. 9 is a multifunctional electrostatic adhesive device according to another embodiment of the present invention measuring the function of a sensor for detecting a change in distance, and showing a change in voltage measured according to a change in the actual distance of an object (glass). will be. Referring to FIG. 9 , since the voltmeter senses a voltage change immediately upon a change in the distance of the object P, it can be seen that the multifunctional electrostatic adhesive device according to another embodiment of the present invention has an excellent function as a sensor.

10 is a reference diagram for explaining self-cleaning using a multifunctional electrostatic adhesive device according to another embodiment of the present invention.

Referring to FIG. 10 , in order for the multifunctional electrostatic adhesive device according to another embodiment of the present invention to have a self-cleaning function, AC power is connected to the first power supply unit or the second power supply unit. When AC power is connected to one power supply unit, the other power supply unit may be connected to ground power.

As shown in the left figure of FIG. 10, before AC power is applied, the first dielectric elastic tube and the second dielectric elastic tube are located in a neutral state. However, when AC power is applied, the first dielectric elastic tube and the second dielectric elastic tube become closer as shown in the central figure of FIG. The elastic tube and the second dielectric elastic tube are separated by an elastic restoring force. While repeating this process, the first dielectric elastic tube and the second dielectric elastic tube vibrate. That is, the electrostatic unit of the multifunctional electrostatic adhesive device of the present invention has flexibility and elasticity, and vibrates by itself by AC power.

11 is a graph for examining the effect of input frequency on the self-cleaning function using a multifunctional electrostatic adhesive device according to another embodiment of the present invention. Referring to FIG. 11 , it can be seen that when the frequency of AC power applied coincides with the resonant frequency of the multifunctional electrostatic bonding device of the electrostatic unit, resonance occurs and vibration is maximized.

12 is a measurement of recovery of adhesive strength as self-cleaning is performed using a multifunctional electrostatic adhesive device according to another embodiment of the present invention. Referring to FIG. 12, it can be seen that many foreign substances are initially attached to the surface of the dielectric elastic tube, and accordingly, the adhesive force is very low. When the self-cleaning function of the multifunctional electrostatic bonding device is operated, it can be seen that the adhesive strength increases over time. After 60 seconds of operating the self-cleaning function, it can be confirmed that foreign substances are almost removed, and the adhesive strength is also almost restored.

FIG. 13 is a reference diagram for explaining that a multifunctional electrostatic bonding device according to another embodiment of the present invention performs various operations such as self-cleaning, distance change detection, adhesion and detachment. The multifunctional electrostatic bonding device used in FIG. 13 is designed such that the first electrostatic unit and the second electrostatic unit are disposed like a spider's web, and a DC power supply, an AC power supply, and a voltmeter are selectively connected to the power supply unit. At this time, it is also possible that DC power is connected to the first power supply and AC power is connected to the second power supply.

In the multifunctional electrostatic adhesive device according to another embodiment of the present invention, washing may be performed regularly or according to a user's operation at regular intervals. In addition, it normally operates in a sensing mode to detect the proximity of an object. In the sensing mode, when the voltage induced as the object approaches the multifunctional electrostatic bonding device exceeds a preset threshold voltage, the bonding mode is switched. In the bonding mode, DC power is connected to the power supply and the object is bonded. In the attachment/detachment mode, the object may be detached by disconnecting DC power or applying AC power instead of DC power to the power supply unit. As such, the multifunctional electrostatic adhesive device according to another embodiment of the present invention has the advantage of simultaneously performing the functions of adhesion, sensing, and self-cleaning.

The protection scope of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is added once again that the scope of protection of the present invention cannot be limited due to obvious changes or substitutions in the technical field to which the present invention belongs.

Claims (13)

A multifunctional electrostatic bonding device including a first electrostatic unit and a second electrostatic unit extending in one direction and having an adhesion mode and a self-cleaning mode, comprising:
The first electrostatic unit includes a first dielectric elastic tube having flexibility and elasticity, a first flexible conductor filled in the first dielectric elastic tube, and a first power supply unit connected to the first flexible conductor,
The second electrostatic unit includes a second dielectric elastic tube having flexibility and elasticity, a second flexible conductor filled in the second dielectric elastic tube, and a second power supply unit connected to the second flexible conductor,
The first dielectric elastic tube and the second dielectric elastic tube are disposed to face each other,
In the adhesion mode, direct current power is applied to the first power supply unit or the second power supply unit, so that the first electrostatic unit or the second electrostatic unit has electrostatic adhesion;
In the self-cleaning mode, when AC power is applied to the first power supply unit, the first electrostatic unit and the second electrostatic adhesive device are self-cleaned by vibrating while repeatedly coming closer to each other and moving away from each other.
According to claim 1,
The multifunctional electrostatic bonding device according to claim 1 , wherein fine wrinkles or fine cracks are formed on an outer surface of the first dielectric elastic tube or the second dielectric elastic tube.
According to claim 1,
The multi-functional electrostatic adhesive device of claim 1 , wherein a contamination prevention layer is further formed on an outer surface of the first dielectric elastic tube or the second dielectric elastic tube.
According to claim 1,
The multifunctional electrostatic bonding device according to claim 1 , wherein the first dielectric elastic tube or the second dielectric elastic tube is an acrylic dielectric elastomer or a silicon dielectric elastomer.
According to claim 1,
The first flexible conductor or the second flexible conductor is an ionic conductor composed of hydrogel, organogel, ionogel and ionoelastomer, carbon nano tube And a carbonaceous conductor made of graphene and an elastic composite including at least one of the carbonaceous conductor, mercury (Hg), gallium (Ga), cesium (Cs), rubidium (Rb) and francium (Fr). A multifunctional electrostatic adhesive device, characterized in that selected from the group consisting of a liquid metal consisting of and an elastic composite containing at least one of the liquid metal.
According to claim 1,
The multi-functional electrostatic bonding device according to claim 1 , wherein in the bonding mode, the first and second dielectric elastic tubes of the first electrostatic unit and the second electrostatic unit are stretched to enhance adhesion.
According to claim 1,
When AC power is applied to the first power unit in the self-cleaning mode, the frequency of the AC power is a resonant frequency of the multifunctional electrostatic bonding device.
According to claim 3,
The multifunctional electrostatic bonding device has a sensing mode for sensing whether an object is approaching or moving away,
A voltmeter is installed in the first power supply unit or the second power supply unit, and the voltmeter detects a voltage that changes when an object is adjacent to the first dielectric elastic tube or the second dielectric elastic tube, thereby sensing that the object is approaching or moving away. A multifunctional electrostatic bonding device characterized in that it can.
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