KR101854513B1 - Manufacturing Method for A Multi Layered Electroactive Polymer Actuator using Roll-to-Roll process and The Actuator manufactured by the same method - Google Patents
Manufacturing Method for A Multi Layered Electroactive Polymer Actuator using Roll-to-Roll process and The Actuator manufactured by the same method Download PDFInfo
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- KR101854513B1 KR101854513B1 KR1020160000848A KR20160000848A KR101854513B1 KR 101854513 B1 KR101854513 B1 KR 101854513B1 KR 1020160000848 A KR1020160000848 A KR 1020160000848A KR 20160000848 A KR20160000848 A KR 20160000848A KR 101854513 B1 KR101854513 B1 KR 101854513B1
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Abstract
The present invention relates to a layered electroactive polymer actuator and a method of manufacturing the same, and a method of manufacturing a layered electroactive polymer actuator according to an embodiment of the present invention can reduce the manufacturing process and time by using a roll-to-roll process, The layered electroactive polymer actuator according to the embodiment can improve the degree of alignment of the stacked electrodes, thereby providing a layered electroactive polymer actuator having easy connection between the electrodes.
Description
The present invention relates to a laminate-type electroactive polymer actuator and a manufacturing method thereof, and more particularly, to a method of manufacturing a laminate-type electroactive polymer actuator capable of laminating an electrode and a piezoelectric or electrostrictive polymer film using a roll-to- And a driver manufactured by the manufacturing method.
EAP (Electroactive Polymer) is a promising material that can attain strain tens of tens of times greater than the strain (maximum 0.2%) that can be obtained from conventional ferroelectric ceramics under electrical stimulation. In addition, as with many polymer materials, EAP can easily be manufactured in various forms and is attracting much attention as various sensors and actuators.
In particular, the lightweight and flexible nature of EAP increases the likelihood of future use as a detector and driver in flexible electronics.
It is also called artificial muscle because it can simulate a biological muscle with high fracture toughness, large strain, and high vibration damping characteristics. It is also called a biomimetic robot robot) have been studied in various fields.
EAP can be classified into electronic EAP and ionic EAP according to the driving method. Ionic EAP has a disadvantage in that it is deformed by the movement of ions due to the applied current, so that the driving voltage is low but the response speed is slow. In addition, ionic EAP mainly uses electrolytes, and it is not easy to increase the response speed due to the physical limitations on diffusion and migration speed of ions in the electrolyte. Since electrolyte sealing is required, reliability improvement should be preceded.
On the other hand, Electronic EAP has a disadvantage in that the driving speed is high, but the driving voltage is high, by using the force received by the electrons under an electric field. Typical electric EAP actuators include dielectric elastomer actuators and PVDF-based ferroelectric polymer actuators. To commercialize such electric EAP detectors and actuators, it is necessary to lower the operating voltage.
In particular, a relaxed ferroelectric polymer actuator using P (VDF-TrFE-CFE) or poly (vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) ferroelectric polymer actuators cause strains of up to 5 to 7% under an electric field of 20 to 150 V / μm.
Therefore, even if the electrostrictive polymer material such as the piezoelectric polymer or the relaxed ferroelectric polymer has a thickness of only 10 m, the voltage required for driving reaches 200 to 1500V. Therefore, in order to lower the driving voltage of the piezoelectric or electrostrictive polymer material to a usable level, it is necessary to make the thickness of the polymer film as thin as possible, and to achieve a desired level of power, a laminated polymer actuator having multiple layers of piezoelectric or electrostrictive polymer films It should be developed. At this time, a positive electrode and a negative electrode must be stacked alternately between the polymer layers.
The PVDF-based ferroelectric polymer is produced mainly by high-temperature extrusion or solution casting. However, the PVDF-based ferroelectric polymer film with a thickness of 10 μm or less can not be produced by the high-temperature extrusion method.
In addition, the solution casting method mainly produces a PVDF-based ferroelectric polymer film on a glass substrate. According to Korean Patent Laid-Open Publication No. 10-2013-0101833 entitled " PVDF polymer film production method and method for manufacturing a laminate type polymer actuator using the same, A PVDF-based ferroelectric polymer film having a thickness of 1 μm can be manufactured.
However, the conventional technique has a problem that it is not suitable for mass production because a thin film is manufactured on a glass plate.
In addition, since the stacked electroactive polymer actuator according to the prior art is manufactured by a separate lamination process, it is difficult to connect the electrodes because the electrodes are exposed with difficulty.
It is an object of the present invention to provide a method for manufacturing a laminated electroactive polymer actuator having a shortened manufacturing process and time.
Another object of the present invention is to provide a layered electroactive polymer actuator having easy connection between electrodes.
According to another aspect of the present invention, there is provided a method of manufacturing a stacked electroactive polymer actuator, including: providing a support film and a piezoelectric or electrostrictive polymer film formed on the support film between a first roll and a second roll; An electrode forming step of forming an electrode on the piezoelectric or electrostrictive polymer film, and a separating step of separating and laminating the electrode and the piezoelectric or electrostrictive polymer film from the support film while rotating the third roll.
The providing step may include a coating step of applying a piezoelectric or electrostrictive polymer solution on the support film, a film forming step of volatilizing the solvent of the solution to form a piezoelectric or electrostrictive polymer film, and a step of forming the piezoelectric or electrostrictive polymer film And an annealing step of annealing to a temperature.
In addition, the piezoelectric or electrostrictive polymer film may include a PVDF (polyvinylidene fluoride) -based polymer.
The electrodes may be formed at predetermined intervals along the direction in which the piezoelectric or electrostrictive polymer film advances by the rotation of the first and second rolls.
Further, the interval can satisfy the condition of Equation (1).
[Equation 1]
Here, D_min = minimum interval, t = thickness of the piezoelectric or electrostrictive polymer film, and N = number of stacked electroactive polymer actuators.
In addition, the electrode forming step may alternately extend a predetermined distance every 2? (R + tN) from the position where the formation of the electrode starts.
Here, R = radius of the third roll.
Also, in the electrode forming step, the electrodes may be formed with the same interval between the electrodes on the same laminated surface, and the electrode may be formed at intervals of 2? TN plus 2? (R + tN) apart.
The surface temperature of the third roll may be in the range of 50 캜 to the melting point of the piezoelectric or electrostrictive polymer film.
Also, the separating step may alternately stack the upper layer electrode and the lower layer electrode alternately arranged so that one region is overlapped and the other region is not overlapped.
Further, the method may further include a producing film providing step of providing the first and second piezoelectric or electrostrictive polymer films produced by the providing step and the electrode forming step, and a bonding step of bonding the first and second piezoelectric or electrostrictive polymer films can do.
In the bonding step, the electrode on the piezoelectric or electrostrictive polymer film and the electrode on the first piezoelectric or electrostrictive polymer film may be staggered so that one area is overlapped and the other area is not overlapped.
The separating step may further include cutting the piezoelectric or electrostrictive polymer film so that both ends of the electrode are exposed.
The cutting step may further include an etching step of removing a piezoelectric or electrostrictive polymer film at both end regions of the electrode using an etching process.
In the electrode forming step, the
The layered electroactive polymer actuator according to an embodiment of the present invention includes at least two electrodes stacked, at least one piezoelectric or electrostrictive polymer film laminated between the electrodes, an active region in which the upper electrode and the lower electrode overlap, And an inactive region in which the upper layer electrode and the lower layer electrode are not overlapped with each other.
In addition, the inactive region may remove one region of the piezoelectric or electrostrictive polymer film.
Also, the cross section may be formed in a trapezoidal shape.
The method for manufacturing a stacked electroactive polymer actuator according to an embodiment of the present invention can shorten the manufacturing process and time by using a roll-to-roll process.
In addition, the layered electroactive polymer actuator according to the embodiment of the present invention can improve the degree of alignment of the stacked electrodes, thereby providing a layered electroactive polymer actuator having easy connection between the electrodes.
1 is a flowchart showing a method of manufacturing a stacked electroactive polymer actuator according to an embodiment of the present invention.
FIG. 2A is a view showing a providing step according to an embodiment of the present invention, FIG. 2B is a view showing an electrode forming step, and FIG. 2C is a view showing a separating lamination step.
FIG. 3A is a cross-sectional view of a piezoelectric or electrostrictive polymer film and electrodes laminated on a third roll according to an embodiment of the present invention, and FIG. 3B is a plan view in which electrodes are spaced apart from each other on a piezoelectric or electrostrictive polymer film Fig.
FIG. 4A is a view showing a production film providing step, and FIG. 4B is a view showing a bonding step.
5A and 5B are cross-sectional views of a stacked electroactive polymer actuator according to an embodiment of the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.
FIG. 1 is a flowchart showing a method of manufacturing a stacked electroactive polymer actuator 100 (see FIG. 3A) according to an embodiment of the present invention.
1, a method of manufacturing a stacked
A concrete description of each of the manufacturing steps (S100-S300) will be described with reference to FIGS. 2A to 2D.
First, a detailed description will be made of the providing step S100 with reference to FIG. 2A.
2A is a diagram illustrating a providing step S100 according to an embodiment of the present invention.
2A, in a providing step S100, a
In the providing step S100, a piezoelectric or electrostrictive polymer solution based on PVDF (polyvinylidene fluoride) is applied on the supporting
At this time, since the
Next, the electrode forming step S200 will be described in detail with reference to FIG. 2B.
FIG. 2B is a view illustrating an electrode forming step (S200) according to an embodiment of the present invention.
2B, in the electrode forming step S200, the
The
Next, with reference to FIG. 2C, a detailed description will be given of the separation and lamination step S300.
2C is a view showing a separation lamination step S300 according to an embodiment of the present invention.
As shown in FIG. 2C, the
The
The separating lamination step S300 according to the embodiment of the present invention applied to the PVDF-based relaxed ferroelectric film may be performed by maintaining the temperature of the
In the separate lamination step S300 according to the embodiment of the present invention, the
A specific process of stacking the
3A is a sectional view of a piezoelectric or
More than one
Since the piezoelectric or
The length of the inactive region C is intended to prevent damage to the active region B due to a process error while exposing the
As the distance D between the
Therefore, in order to prevent the
From here,
D_min = minimum interval,
t = thickness of the piezoelectric or electrostrictive polymer film,
N = number of stacked layers of electroactive polymer actuator,
to be.
In order to form the inactive region C, the
Here, R is the radius of the
The
In the electrode formation step S200, the
3B, the
Also, in the electrode forming step S200 according to the embodiment of the present invention, the spacing D of the
As the number of stacked layers N increases, the circumference increases and the position at which the
The
In addition, the
In this case, since the positive electrode and the negative electrode are alternately stacked between the lamination surfaces of the piezoelectric or
As described above, the manufacturing method of the stacked
A method of manufacturing a stacked
4A is a view showing a production film providing step according to an embodiment of the present invention.
4A, the manufacturing film providing step may include providing the second piezoelectric or
4B is a view illustrating a bonding step according to an embodiment of the present invention.
4B, the bonding step may include bonding the
5A and 5B are cross-sectional views of a stacked
5A, a stacked
In the stacked
That is, the laminated
5B, in the stacked
In order to manufacture the
The piezoelectric or
In this case, in the cutting step S400, when the
In the stacked
In addition, since the
The features, structures, effects and the like described in the foregoing embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Further, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified in other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments may be modified and implemented. It is to be understood that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof.
100, 300: stacked electroactive polymer actuator
111, 112, 113: first, second and third rolls
120: Support film
130: Piezoelectric or electrostrictive polymer film
140: electrode
Claims (17)
An electrode forming step of forming an electrode on the piezoelectric or electrostrictive polymer film; And
And separating and stacking the electrode and the piezoelectric or electrostrictive polymer film separated from the support film while rotating the third roll,
Wherein the separating and laminating step comprises:
Wherein the upper electrode and the lower electrode are alternately stacked so that one region is overlapped and the other region is not overlapped.
Wherein the providing step comprises:
Applying a piezoelectric or electrostrictive polymer solution on the support film;
A film forming step of volatilizing the solvent of the solution to form a piezoelectric or electrostrictive polymer film; And
And an annealing step of annealing the piezoelectric or electrostrictive polymer film to a predetermined temperature.
Wherein the piezoelectric or electrostrictive polymer film comprises a PVDF (polyvinylidene fluoride) -based polymer.
Wherein the electrodes are formed at predetermined intervals along the direction in which the piezoelectric or electrostrictive polymer film advances by rotation of the first and second rolls.
Wherein the interval satisfies the condition of Equation (1).
[Equation 1]
From here,
D_min = minimum gap between electrodes,
t = thickness of the piezoelectric or electrostrictive polymer film,
N = number of stacked electroactive polymer actuators.
The electrode forming step may include:
(R + tN) from a position at which the formation of the electrode is started alternately by a predetermined distance.
From here,
R = radius of the third roll,
t = thickness of the piezoelectric or electrostrictive polymer film,
N = number of stacked electroactive polymer actuators.
The electrode forming step may include:
Wherein the electrode is formed on the same lamination surface at the same interval and by adding 2? TN for every 2? (R + tN) apart point.
From here,
R = radius of the third roll,
t = thickness of the piezoelectric or electrostrictive polymer film,
N = number of stacked electroactive polymer actuators.
Wherein the surface temperature of the third roll is within a range of 50 占 폚 to the melting point of the piezoelectric or electrostrictive polymer film.
Providing a first and a second piezoelectric or electrostrictive polymer film produced by the providing step and the electrode forming step; And
And bonding the first and second piezoelectric or electrostrictive polymer films to each other.
In the joining step,
Wherein the electrodes on the piezoelectric or electrostrictive polymer film and the electrodes on the first piezoelectric or electrostrictive polymer film are stacked one on top of the other so that the other areas do not overlap with each other.
And cutting the laminated piezoelectric or electrostrictive polymer film so that both ends of the electrode are exposed.
Wherein the cutting step further comprises an etching step of removing a piezoelectric or electrostrictive polymer film in both end regions of the electrode using an etching process.
The electrode 140 may be formed by extending or shortening the electrode 140 by a predetermined length so that the electrode 140 has a trapezoidal cross-sectional shape,
Wherein the cutting step includes an etching step of removing the piezoelectric or electrostrictive polymer film so that both ends of the electrode (140) having a trapezoidal cross section are exposed.
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