KR20080084215A - The directional adhesive structures to be controllable adhesion force and the manufacturing method thereof - Google Patents

Abstract

A directional adhesion structure, and a method for preparing the directional adhesion structure are provided to allow the adhesive strength to be controlled, to allow it to be used repeatedly and to allow the impurities to be removed by washing. A directional adhesion structure comprises a base(2) which is made of a polymer material; and a plurality of cilia(3) of a certain length which are formed in one body at the base and are inclined to the certain direction with a certain angle(alpha) at the axis perpendicular to the base. Preferably the end of the cilia is inclined to the direction identical to the inclined direction of the cilia, and the inclined surface(3a) of a certain angle(beta) is formed based on the axis of the longitudinal direction of cilia.

Description

The directional adhesive structures to be controllable adhesion force and the manufacturing method

1 is a perspective view of an embodiment of the adhesive structure of the present invention.

FIG. 2 is a cross-sectional view showing an angle formed by an axis of the cilia with an axis perpendicular to the base and an angle formed by an inclined plane with the longitudinal axis of the cilia in the embodiment of FIG. 1. FIG.

Figure 3 is a perspective view of one embodiment using the adhesive structure of the present invention.

4 is a perspective view of another embodiment using the adhesive structure of the present invention.

FIG. 5 is a partial cross sectional view in the initial stage of attaching an attachment in the embodiment of FIG. 3 or FIG. 4; FIG.

FIG. 6 is a partial cross-sectional view of a state in which tangential force is maximum after attaching an attachment in the embodiment of FIG. 3 or FIG. 4.

FIG. 7 is a cross-sectional view illustrating dynamics of one cilia in FIG. 6. FIG.

8 is a partial cross-sectional view when the embodiment of FIG. 3 or FIG. 4 or one adhesive structure is applied to a vertical attachment surface. FIG.

FIG. 9 is a cross-sectional view illustrating a dynamic relationship of one cilia in the structure of FIG. 8. FIG.

10 is a perspective view showing a mold for a method of manufacturing an adhesive structure of the present invention.

11 is a cross sectional view of a process for producing the bonded structure of the present invention.

Explanation of symbols on main parts of drawing

1: Bonding structure 2: Base

3: cilia 3a: inclined surface

10: chuck 11: fixed plate

12: rectangle frame 13: guide

20: Chuck 21: fixed plate

22: circular frame 23: guide part

100: mold 101: base mold

101a: base space 111: ciliated mold

111a: V-shaped groove 111b: ciliated hole

121: upper mold 121a: V-shaped curved portion

  M: Attachment

The present invention relates to a directional adhesive structure capable of controlling the adhesive force and to a manufacturing method for manufacturing the adhesive structure, and more particularly, to a dry adhesive structure, a base formed of a polymer and a cilia integrally formed on the base. The present invention relates to an adhesive structure capable of controlling repeated use and adhesive force according to a direction and a method of manufacturing the same.

In the conventional adhesive structure, a wet adhesive tape using an adhesive material is mainly used. For example, there are transparent tapes manufactured by Scotch. When the transparent tape is attached to glass or the like, the adhesion is excellent, but it is difficult to reuse, and there is a problem in that the adhesive material falls on the glass together and becomes dirty. In addition, there was a problem that it is impossible to control the adhesive force of the tape.

In addition, as a result of the sole structure of the conventional lizard, there have been many studies on dry adhesives, and there have been dry adhesives using nano carbon tubes and dry adhesives using polymer nanofibers. These techniques make use of Van der waals force between a myriad of fine fibers and their attached objects, making them difficult to manufacture and attaching them with great vertical force on nanotubes or nanofibers. In addition, it was very difficult to control the adhesive force because there was no directivity.

In addition, the adhesive structure using the carbon nanotubes had a problem that can not be reused because the fiber can not maintain the shape after applying the vertical force to the nanofibers.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an adhesive structure that can be used repeatedly.

In addition, an object of the present invention is to provide a detachable adhesive structure without damaging the product to be bonded.

In addition, an object of the present invention is to provide an adhesive structure that can be easily attached without a large vertical force, and also allows the control of the adhesive force.

In addition, an object of the present invention is to provide an adhesive structure that can be used even in a vacuum state because it is not affected by electric or magnetic forces.

An object of the present invention described above is composed of a base made of a polymer material; and a plurality of cilia of a predetermined length integrally formed on the base; wherein the cilia have a predetermined angle at an axis perpendicular to the base. It is achieved by providing a directional adhesive structure capable of controlling the adhesive force, characterized in that formed in an inclined direction. The adhesive structure of the present invention is preferably made of a polymer material. The polymer is a polymer, both synthetic and natural polymers can be applied to the present invention. In the case of the polymer material, although the bulk material itself has a large stiffness, when it is made in the form of fine hair, the rigid material may be in a form that is advantageous for adhesion. By being manufactured in the form of fine hairs, when the cilia are attached to a smooth object such as glass, the attached portion is subjected to van der waals force to generate an adhesion force. In addition, since the cilia are bent, the inclined direction of the cilia is inclined, and when the inclined cilia are adhered to the adherend, the adhesion area may be widened. The greater the adhesive area, the greater the van der Waals force and the greater the adhesive force. Therefore, the cilia are inclined in a predetermined direction.

In addition, a preferred feature of the present invention is that the ends of the cilia are inclined in the same direction as the inclined direction of the cilia, and an inclined surface of a predetermined angle is formed with respect to the longitudinal axis of the cilia. Forming an inclined surface at the end of the cilia, the area of the inclined surface has a much larger area than the diameter of the cilia, thus increasing the adhesion area and increasing the van der Waals force acting on the adhesion surface, thereby increasing the adhesion force do. However, the cilia may be used in the shape of a square column rather than a cylindrical shape. In addition, it can be manufactured and used in the form of various polygons, but there is an advantage that it is convenient to manufacture a circular case.

In addition, a preferred feature of the present invention is that the plurality of cilia are formed by staggering one row and the next. Since one row of multiple cilia and the next row are formed alternate with each other, the number of cilia entering the unit area increases. In addition, when the cilia are inclined in the inclined direction by the compressive force, and the entire inclined surface of the cilia ends is adhered to the attachment, one cilia and the other cilia need appropriate adhesion space. Therefore, the rows of cilia are preferably formed to cross each other.

In addition, a preferred feature of the present invention is that the angle formed by the axis perpendicular to the base and the cilia is formed between 5 ° and 45 °. The inclination of the angle between the base and the cilia is intended to bend easily in a certain direction. This is because the adhesive force can be controlled according to the directionality when bent in a predetermined direction.

In addition, a preferred feature of the present invention is that the angle formed by the longitudinal axis of the cilia and the inclined surface is formed between 10 ° and 90 °. The inclined surface formed at the end of the cilia is to widen the adhesive area, and as the adhesive area is wider, the adhesive force can be strongly controlled, thereby forming the inclined surface inclined at an angle.

In addition, a preferable feature of the present invention is that the diameter of the cilia is 1 µm to 500 µm, and the length is formed to 100 µm to 1 mm. In the case where the diameter of the cilia is formed in the nano size, it is not important to form an inclined surface at the end of the cilia. However, as in the case of the present invention, when the diameter is formed from several micro to several hundred micro, the inclined surface formed at the end of the cilia has a significant meaning. Formation of the inclined surface, as described above, serves to increase the adhesive area to increase the adhesive force.

In addition, an object of the present invention comprises the steps of injecting a liquid polymer into the lower mold consisting of a base mold portion formed with a base space and a ciliary mold portion formed on the base space; Compressing the polymer injected into the lower mold and coupling the upper mold to form an inclined surface at an upper end of the polymer; And separating the upper part of the base mold part after a predetermined time has elapsed in a form in which the upper mold is combined, which is achieved by providing a method of manufacturing a directional adhesive structure capable of controlling adhesive strength.

In the manufacturing method of the present invention, a mold for the shape of the adhesive structure should be manufactured.

As a method of manufacturing a mold, a base mold part for forming a base must first be formed. When the base mold part in which the base space is formed is provided, a cilia mold part to be mounted on the upper part of the base mold part should be formed. The ciliated mold part includes a mold part body; A plurality of ciliated holes formed at an angle to the body at a predetermined angle; Consists of a V-shaped groove formed on the upper end of the body, the lower portion of the ciliated forming hole is connected to the base space, the upper portion of the ciliated forming hole is formed through the inclined surface of the V-shaped groove. The ciliated mold part first forms a V-shaped groove part at an upper portion thereof, and when the V-shaped groove part is formed, the ciliary forming hole connected to the base is made to penetrate the one slope surface of the V-shaped groove part. However, the upper mold completes the mold by pouring silicon or the like into the V-shaped groove portion of the ciliated mold portion before forming the ciliary forming hole. Thus, the upper mold is composed of a body and a V-shaped bent portion formed to fit in the V-shaped groove portion of the ciliated mold portion at one end of the body.

When the mold is completed, the liquid polymer is injected into the ciliated hole formed in the V-shaped groove of the ciliated mold part. Since the cilia-forming holes are formed as fine holes, the polymer is filled to the base by capillary action.

After injecting the polymer into the mold, the edge of the base may not be filled due to the surface tension of the polymer, thus compressing the polymer into the upper mold and joining the upper mold to the lower mold. The V-shaped bent portion of the upper mold is inserted into the V-shaped groove of the ciliated mold part to form an inclined surface at the end of the cilia composed of the polymer, and compresses the polymer with the V-shaped bent portion so as to completely fill up to some corner portions. In addition, the excess polymer flows outward through the bonding of the upper mold.

After a predetermined time has elapsed after the upper mold is bonded to the lower mold filled with polymer, the ciliary mold portion and the upper mold are separated from the base mold portion. By separating the mold, the adhesive structure of the present invention is formed.

Hereinafter, the principle and embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a perspective view of an embodiment of the adhesive structure of the present invention, Figure 2 is an embodiment of the embodiment of the adhesive structure of the present invention showing the angle formed by the axis perpendicular to the base and the inclined surface formed by the longitudinal axis of the cilia 3 is a perspective view in which the inclined surfaces of the adhesive structure face each other as an embodiment using the adhesive structure of the present invention, and FIG. 4 is another embodiment in which the inclined surfaces face each other using the adhesive structure of the present invention. The structure is a perspective view installed in each 90 ° direction, FIG. 5 is a partial cross-sectional view in the initial stage of attaching the attachment in the embodiment of FIG. 3 or FIG. 4, and FIG. 6 in the embodiment of FIG. 3 or 4. Figure 7 is a partial cross-sectional view after the tangential force is the maximum action after attaching the attachment, Figure 7 is a cross-sectional view showing the dynamic relationship of one cilia in Figure 6, Figure 8 is a 4 is a partial cross-sectional view when the embodiment of FIG. 4 is attached to a vertical surface, FIG. 9 is a cross-sectional view showing the dynamic relationship in the structure of FIG. 8, and FIG. 10 is a perspective view showing a mold for the method of manufacturing the adhesive structure of the present invention. 11 is a cross-sectional view showing a step of a method of manufacturing an adhesive structure of the present invention.

1 is a perspective view of an embodiment of the adhesive structure of the present invention, wherein the adhesive structure 1 according to the present invention consists of a base 2 and a plurality of cilia 3 formed integrally with the base. As can be seen in the figure, one column and the other column are alternately formed. This is to increase the number of cilia 3 per unit area, and to secure a space to which the inclined surface 3a can be attached since the cilia 3 are inclined and adhered to the attachment M. FIG. The adhesive structure 1 of the present invention is generally used as a polymer material. The cilia 3 formed on top of the base 2 are formed at a constant angle, which is illustrated well in FIG. 2. 2 shows that the cilia 3 are inclined at an angle α from the dashed axis perpendicular to the base 2. It is also shown that the end of the cilia 3 has an inclined surface 3a which is inclined at an angle β from the one-dot chain line axis, which is the longitudinal axis of the cilia 3. The α value may have a value corresponding to 5 ° to 45 °, and the β value may have a value corresponding to 10 ° to 90 °.

First, an embodiment using the adhesive structure of the present invention shown in FIG. 3 will be described. 3 is a kind of chuck 10 for lifting or fixing an object, and two adhesive structures installed on the rectangular frame 12 so that the inclined surfaces 3a face each other can be moved back and forth. Specifically, the fixing plate 11 is installed on the bottom of the base installed on one side of the rectangular frame 12, the base 2 is fixed to the upper portion of the fixing plate 11 and the inclined surface (3a) on the base A cilia 3 formed to see the opposite adhesive structure and a movement guide 13 (see FIG. 5) formed to be movable by giving a tangential force formed on the bottom of the fixing plate 11 are provided. On the other side of the rectangular frame 12, the adhesive structure formed so that the inclined surface 3a can see the opposite adhesive structure is provided in the same manner as the one provided on one side. The fixing plate 11 is for fixing the pad base 2 in the above.

The adhesion principle in the embodiment represented in FIG. 3 will be described with reference to FIGS. 5 to 7. In Figure 3, the adhesive structure of the chuck 10 is mounted while the inclined surfaces face each other. 5 represents the step of adhering the chuck 10 to the attachment M. FIG. When the tip of the cilia 3 is placed on the attachment M, and a tangential force F _T is applied to the guide portion 13, the inclined surface 3a of the cilia 3 adheres to the surface of the attachment gradually. As the area of the inclined surface 3a adhered to the attachment increases, the adhesion force is increased (FIGS. 6 and 7). Thus, to some extent, the magnitude of the tangential force is proportional to the adhesive force. As mentioned above, the source of adhesion is due to van der Waals forces between the inclined surface 3a of the cilia 3 and the attachment. In addition, if the size of the tangential force (F _T ) is reduced, the adhesive force is reduced, in the absence of tangential force can be easily detached from the attachment. Therefore, the object can be easily lifted or fixed using the chuck, and the object can be easily moved and removed. Due to this feature, a directional adhesive structure capable of controlling the adhesive force is achieved.

4 is another embodiment using the adhesive structure of the present invention, the figure shown in Figure 4 also serves as a kind of chuck 20. In FIG. 4, four adhesive structures are formed on the circular frame 22. The four adhesive structures face the inclined surfaces 3a at 90 ° to each other. Specifically, the fixing plate 21 is formed on the upper part of the circular frame 22, the base 2 is fixed on the upper part of the fixing plate 21, and the plurality of cilia 3 formed integrally on the upper part of the base. do. A guide portion 23 (see FIG. 5) is formed at the lower portion of the fixing plate 21 to adjust the adhesive force by applying a tangential force to the guide portion 23. Also in this embodiment, a directional adhesive structure capable of controlling the adhesive force as in the embodiment of FIG. 3 is provided.

The adhesion principle of the embodiment represented in FIG. 4 will be described with reference to FIGS. 5 to 7. In this embodiment also has the same adhesive structure as in the case of FIG. However, in the present embodiment, since four adhesive structures are formed, it may have a larger adhesive force than the embodiment of FIG. 3. Therefore, the attachment M, which carries more load than the embodiment of FIG. 3, may also be lifted or fixed, and may be detached after moving. 5 represents the step of adhering the chuck 20 to the attachment M. FIG. When the tip of the cilia 3 is placed on the attachment M, and the tangential force F _T is applied to the four guide portions 23, the inclined surface 3a of the cilia 3 gradually adheres to the surface of the attachment. As the area of the inclined surface 3a adhered to the attachment increases, the adhesion force is increased (FIGS. 6 and 7). Thus, to some extent, the magnitude of the tangential force (F _T ) is proportional to the adhesive force. As mentioned above, the source of adhesion is due to van der Waals forces between the inclined surface 3a of the cilia 3 and the attachment. In addition, if the size of the tangential force (F _T ) is reduced, the adhesive force is reduced, in the absence of tangential force can be easily detached from the attachment. Thus, the present bonding structure forms a bonding structure having a directivity. Moreover, since it is directional, control of adhesive force is attained.

FIG. 7 is a cross-sectional view showing the dynamic relationship of one cilia 3 of the embodiment represented in FIG. 3 or FIG. 4. FIG. 7 shows the dynamic relationship when the inclined surface 3a is completely adhered. However, when explaining the initial process, the cilia 3 of the adhesive structure is adhered to the attachment M by applying the first slight compressive force F _P. Only the adhesive force, which is the normal force (F _N ) due to van der Waals forces, acts. If the tangential force F _T is continuously applied in the above state, the adhesion area of the inclined surface 3a is increased, and as the adhesion area is increased, the adhesive force is increased, and the inclined surface 3a is the maximum area of the attachment M. When the adhesive is bonded to the composite force (F _R ) by the adhesive force and the tangential force is displayed as shown in the figure. Since the synthetic force F _R is directed toward the inside of the attachment as shown in the figure, it is possible to lift or fix the object. In addition, since the adhesive area is widened by the tangential force, the tangential force and the adhesive force are proportional to each other to a certain range. That is, as the tangential force increases, the adhesion area of the inclined surface 3a increases, thereby increasing the adhesion force, and vice versa. Therefore, the adhesive structure of the present invention is directionally bonded and released according to the magnitude of the tangential force. Therefore, the adhesive force can be controlled.

8 and 9 correspond to the diagram showing the dynamics of the vertical attachment. That is, FIGS. 8 and 9 show the dynamic relationship when the embodiment of FIG. 3 or 4 is attached to the vertical attachment M or only one adhesive structure is attached to the vertical attachment M. FIG. In the case of the vertical form, the basic principles described above are applied. Applying a slight compressive force (F _P ) to bond the cilia (3) to the vertical attachment (M) and increase the tangential force (F _T ), the adhesion area of the inclined surface (3a) gradually increases, the adhesion area increases As a result, the adhesion increases. The rest of the description is the same as described above and will be omitted.

Using the embodiment of the adhesive structure of the present invention using Fig. 1, or by applying the embodiment of Fig. 3 or 4 using the adhesive structure of the present invention (for example, the adhesive structure can be implemented in a cylindrical shape) various adhesive structures Those skilled in the art to which the present invention pertains can easily make modifications, and various modifications using the adhesive structure of the present invention as well as the present embodiment are obvious to those skilled in the art and thus fall within the scope of the present invention. Using the adhesive structure of the present invention, it serves as a chuck for transferring the wafer in the wafer manufacturing process, the transfer process for transferring the semiconductor in the semiconductor process, and the transfer process or the upper and lower plate bonding process for transferring the LCD in the LCD process It can be used in various fields. In addition, the adhesive structure of the present invention is not affected by magnetic or electric forces, and thus, the processes such as transporting and bonding in a manufacturing process in a vacuum space, and gloves and shoes when the astronaut works in space By attaching and using an adhesive structure, the work can be safely performed. Also, the present invention can be applied to a robot or the like which is movable through a wall such as glass. In addition to the above examples, it can be used wherever control of the adhesive force is required.

10 and 11 are diagrams showing a manufacturing method for the adhesive structure of the present invention.

10 is a perspective view of the entire mold used in the manufacturing method. In the figure, the entire mold 100 including the base mold 101, the lower mold composed of the cili mold 111, which is fixedly mounted on the base mold 101, and the upper mold 121, Express.

In Fig. 11, a manufacturing process is represented. As shown in the drawing, a base mold 101 in which the base space 101a is formed, a plurality of ciliary forming holes 111b and the holes formed to be inclined at a predetermined angle on the base space 101a. 111b) Consists of a V-shaped groove 111a formed in the upper portion, and injects a liquid polymer into the lower mold composed of a ciliary mold portion 111 fixed to the upper portion of the base mold portion 101 (S1). . After injecting the polymer into the mold, the edge of the base may not be filled due to the surface tension of the polymer, thereby compressing the polymer with the upper mold 121 and coupling the upper mold 121 to the cilia mold 111. do. The V-shaped curved portion 121a of the upper mold 121 is inserted into the V-shaped groove portion 111a of the cilia mold portion 111 so as to form an inclined surface at the end of the cilia made of polymer, and the V-shaped curved portion Compress the polymer with (121a) so it is completely filled up to some corners. In addition, the excess polymer will flow out to the bonding of the upper mold 121. After the upper mold 121 is joined, the ciliary mold 111 and the upper mold 121 are separated together from the base mold 101 after a predetermined time when the polymer is hardened, thereby adhering to the adhesive structure of the present invention. Is prepared.

The adhesive structure of the present invention has the advantage that it can be used repeatedly, and even when foreign matter is attached, the foreign matter can be easily removed from the adhesive structure by washing or the like, thus enabling semi-permanent use.

In addition, the present invention can be removed without damaging the product to be bonded to ensure the reliability of the product, and when used in the manufacturing process has the effect of eliminating the possibility of defective products.

In addition, the present invention has a great advantage that it can be easily attached without a large vertical force, and also because it is directionally bonded, it is possible to control the adhesive force.

In addition, since the present invention uses the van der Waals force, it can be used in a vacuum state, and has the effect of not being affected by electric or magnetic force.

In addition, the present invention has an advantage that the adhesive force can be controlled because the adhesive force is different depending on the direction of the force acting.

Claims (9)

A base made of a polymer material; and A plurality of cilia of a predetermined length integrally formed on the base; Is composed, The cilia are directional adhesive structure capable of controlling the adhesive force, characterized in that the inclined in a predetermined direction at a predetermined angle on the axis perpendicular to the base. The method according to claim 1, The terminal of the cilia is inclined in the same direction as the inclined direction of the cilia, the directional adhesive structure capable of controlling the adhesive force, characterized in that the inclined surface of a predetermined angle is formed with respect to the longitudinal axis of the cilia. The method according to claim 1, And the plurality of cilia are formed by staggering one row and the next row. The method according to claim 1, The angle formed between the axis perpendicular to the base and the cilia is 5 ° to 45 °, the directional adhesive structure capable of controlling the adhesive force. The method according to claim 2, The angle formed between the longitudinal axis of the cilia and the inclined surface is 10 ° to 90 °, the directional adhesive structure capable of controlling the adhesive force. The method according to claim 1, The diameter of the cilia is 1㎛ to 500㎛, the length is 100㎛ to 1mm directional adhesive structure capable of controlling the adhesive force, characterized in that. Injecting a liquid polymer into a lower mold including a base mold portion on which a base space is formed and a cilia mold portion formed on an upper portion of the base space; Compressing the polymer injected into the lower mold and coupling the upper mold to form an inclined surface at an upper end of the polymer; And Separating the upper part of the base mold part after a predetermined time has elapsed in a form in which the upper mold is combined; Method for producing a directional adhesive structure capable of controlling the adhesive force, characterized in that configured. The method according to claim 7, A ciliated mold part formed on an upper part of the base mold part, a mold part body; A plurality of ciliated holes formed at an angle to the body at a predetermined angle; Consists of a V-shaped groove formed on the top of the body, A lower portion of the ciliated hole is connected to the base space, and the upper portion of the ciliated hole is formed to penetrate through one slope of the V-shaped groove portion. The method according to claim 8, The upper mold is a manufacturing method of the directional adhesive structure capable of controlling the adhesive force, characterized in that the body and the V-shaped concave portion formed to be fitted to the V-shaped groove portion of the ciliary mold portion at one end of the body.

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