KR101006913B1 - Forming method of silicon protrusion using liquid silicon rubber - Google Patents

Abstract

PURPOSE: A method for forming small silicone projections using liquid silicone rubber, capable of directly attaching minute silicon protrusions to various objects, is provided to secure the design and function of the micro-pattern of a silicon protrusion without the declination of texture of the objects. CONSTITUTION: A method for forming small silicone projections using liquid silicone rubber is as follows. An object is prepared. A primer is covered on the target spots of a silicon protrusion of the object. The covered primer is dried. LSR is inserted and attached to a primer-coated part several times. A minute silicon protrusion with a fixed shape is formed and cured.

Description

FORMING METHOD OF SILICON PROTRUSION USING LIQUID SILICON RUBBER}

The present invention relates to a method for forming a fine silicon protrusion using liquid silicone rubber, and specifically, a method of forming a specific pattern by molding a fine silicon protrusion having an independent shape to various kinds of adherends using liquid silicone rubber (LSR). And it relates to an article formed with a fine silicon protrusion of a specific pattern by the method.

Liquid Silicone Rubber (LSR) is a generic term for liquid silicone before it becomes hardened and becomes rubber. Liquid silicone rubber is a condensed liquid silicone rubber which is crosslinked and cured by hydrolysis and condensation reaction in the presence of moisture in the air based on a curing mechanism, and an addition liquid which is crosslinked and cured by addition reaction of siloxane containing Si-H in an unsaturated group. It is classified as silicone rubber. Moreover, depending on curing conditions, it may be classified into room temperature curing type, heat curing type, ultraviolet curing type, oxygen curing type, or basic curing type liquid silicone rubber. Since the liquid silicone rubber as a whole has a problem of low adhesion to components other than silicon, it is difficult to form a specific fine silicon protrusion pattern by directly attached to the fiber, leather or metal material.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a method of forming a fine silicon protrusion pattern by molding a fine silicon protrusion having a specific shape on the adherend by a simple and economical method.

Another object of the present invention is to provide a fine silicon protrusion formed article which is obtained by the above method and which is provided with the characteristics of improving friction or grip by the molded silicon protrusion while maintaining the basic texture and color of the adherend material. .

According to the present invention in order to achieve the above object, the step of preparing a fine silicon projection molded body; A primer coating step of applying a primer to a silicon protrusion forming target portion on the adherend; A primer drying step of drying the applied primer; Forming a fine silicon protrusion having a predetermined shape and a pattern by attaching a liquid silicone rubber to the primer coating site; And it provides a fine silicon protrusion molding method comprising a step of curing a fine silicon protrusion for curing the molded fine silicon protrusion.

At this time, the primer coating step is preferably made by a screen printing method using a film having a predetermined pattern is formed.

The step of forming the fine silicon protrusions is characterized in that for forming the fine silicon protrusions of a specific shape and pattern on the primer coating portion by filling the transfer film after filling the liquid silicone rubber in a film or a mold having a specific pattern or a specific shape and pattern is formed. In addition, the method of forming the fine silicon protrusion may be performed by a roll to roll continuous process. In this case, the fine silicon protrusion forming step may be performed on a printing roll for forming a fine silicon protrusion having a concave groove of a predetermined shape and pattern. After filling the liquid silicon, the gravure transfers the liquid silicone remaining in the concave groove of the printing roll by passing the adherend sheet between the backup roll facing the printing roll and the printing roll. It may be made by a printing method.

According to the present invention for achieving another object of the present invention, there is provided a fine silicon projection formed article in which a fine silicon projection is formed on the adherend of the fiber, natural leather, artificial leather, synthetic resin or metal by the method of forming the fine silicon projection. do. The fine silicon protrusion formed article may be an upper of a shoe, an insole of a shoe, a vehicle handle, or a case of a portable electronic device.

According to the molding method of the present invention, there is an advantage in that the fine silicon protrusions independently separated from each other can be directly attached to various adherends by an economical method. Furthermore, since each of the fine silicon protrusions may be formed in an independent shape and size, there is an advantage in that the fine silicon protrusions may be changed and used according to the purpose of forming the fine silicon protrusions. By attaching microsilicon protrusions with shapes and patterns independent of each other directly to specific parts of various kinds of adherends, it is possible to give functions and designs of silicon protrusion micropatterns without compromising the basic texture or function of the adherend. Applicable to the goods. When the fine silicon protrusion is formed on the upper of the soccer shoes, it is possible to impart the rotational force of the ball by the high frictional force, and is excellent when formed on the automotive goods such as sports gloves, the case of portable electronic devices, the steering wheel of the car or the gear rod. I can give a feeling of grip.

1 is a diagram illustrating a method of forming a fine silicon protrusion according to the present invention.
Figure 2 is a schematic diagram showing a method for forming a discontinuous fine silicon protrusion according to an embodiment of the present invention.
Figure 3 is a schematic diagram showing a continuous fine silicon projection molding method according to an embodiment of the present invention.
Figure 4 is a schematic diagram showing the shape and pattern of the fine silicon protrusions formed according to the present invention.
Figure 5 is a schematic diagram showing a fine silicon protrusion forming step according to an embodiment in a continuous process by a roll-to-roll method according to the present invention.
Figure 6 is a schematic diagram showing the shape of the mold for forming a fine silicon protrusion according to an embodiment of the present invention.
Figure 7 is a photograph of a fine silicon protrusion-forming artificial leather prepared according to an embodiment of the present invention.

Hereinafter will be described in detail with respect to the micro-protrusion forming method using a liquid silicone rubber. The present invention is characterized by forming a fine silicon protrusion by molding a fine silicon protrusion having an independent shape to the adherend other than silicon by a simple method.

As shown in FIG. 1, the method of forming a fine silicon protrusion of the present invention comprises: preparing a fine silicon protrusion forming adherend; A primer coating step of applying a primer to a silicon protrusion forming target portion on the adherend; A primer drying step of drying the applied primer; Forming a fine silicon protrusion having a predetermined shape and a pattern by attaching a liquid silicone rubber to the primer coating site; And a fine silicon protrusion curing step of curing the molded fine silicon protrusion. In the present invention, the fine silicon protrusions formed on the adherend are independent entities not connected to each other, or only a part of the fine silicon protrusions are connected to each other. Therefore, while maintaining the basic texture and color of the adherend material is given a characteristic of improving the frictional force or grip feeling by the molded silicon projection. In particular, in the case of a discontinuous process, it is preferable in terms of design because the micro silicon protrusion pattern can be modified by a simple mold change. When the pigment is added to the liquid silicone rubber, or functional materials such as anion generation, far infrared radiation, and antimicrobial substances are added, design or other additional functions may be imparted in addition to the functionality of the silicon protrusion itself.

The fine silicon protrusion molding according to the present invention may be made by a discontinuous process or a continuous process. As shown in FIG. 2, fine silicon protrusions may be formed discontinuously by a method comprising a cut adherend preparation step, a primer coating step, a liquid silicone rubber injection step using a mold, a silicon curing step, and a mold extraction step. . At this time, the primer coating and the liquid silicone rubber injection step apply the screen printing method. Because it is molded directly on the adherend cut to the shape of a specific product, it is formed without changing the shape of the adherend such as the upper of a shoe, an insole, or a case of a portable electronic device, and molding while changing the fine silicon protrusion of various shapes and patterns. The advantage is that you can. In the case of application to a case of a portable electronic product, the process may be carried out by mounting on a case fixing jig.

In addition, the fine silicon protrusion molding of the present invention may be made by a continuous process by a roll to roll method as shown in FIG. This continuous process is suitable for mass production.

Hereinafter, a method of forming a fine silicon protrusion using liquid silicone rubber by a discontinuous process will be described in detail.

In general, the liquid silicone rubber has a weak adhesive strength to the adherends other than silicon, so that they easily fall after molding. In the present invention, a process of first applying a suitable primer to the silicon protrusion forming part of the adherend according to the material of the adherend is performed. Going through. For example, liquid silicone rubber does not have adhesion to urethane, so it easily falls after molding.If the adherend is a polyurethane-impregnated artificial leather, the primer for urethane is first applied to the fine silicon bump forming portion, and then the liquid silicone rubber is attached. Done. Appropriate primers can be used depending on the type of adherend.

According to one embodiment of the present invention, the screen printing method is applied to make the primer process only on the part where the fine silicon protrusion is formed. First prepare a perforated film for the site where the primer will be applied. After making the silk screen making machine, fix the adherend fiber, leather fabric or metal case, put primer through the making machine and push it as a squeegee. Using this method, accurate primer processing is possible even for small and complex patterns, so the operation is easy and defects rarely occur. The reason why the primer is applied only to the specific site where the fine silicon protrusion is formed is that when the primer is treated, the texture including the gloss and the touch of the primer treated surface is changed compared with the untreated surface. Because functionality can be compromised. If there is no such restriction, it is also possible to prime the entire surface of the adherend.

After applying the primer, the primer is dried. Drying conditions may vary depending on the type of primer. When the drying of the primer is completed to form a fine silicon protrusion having a specific shape and pattern using a liquid silicone rubber on the application portion of the primer. According to one embodiment of the present invention, fine silicon protrusions may be formed by screen printing using a film having a pattern corresponding to the film used in the primer applying step. After making a plate making machine with a film manufactured according to a specific shape and pattern, the fine silicon protrusions may be formed by pushing the liquid silicone rubber into a squeegee through the plate making machine. This method is suitable when the thickness of the fine silicon protrusion is thin, for example, about 500 μm or less. According to another preferred embodiment of the present invention, the silicon protrusion is molded by using a mold processed in a specific shape and pattern. After fabricating a mold for forming a fine silicon protrusion having a predetermined thickness having a specific shape and pattern, the mold is placed in accordance with the primer coating site. The liquid silicone rubber is poured onto the mold and then pushed with a squeegee to fill the mold with liquid silicone rubber, and then transferred to form a fine silicon protrusion having a specific shape and pattern. By changing the mold processed in various shapes and patterns, as shown in FIG. 4, fine silicon protrusions having various shapes and patterns may be formed on specific portions of the adherend. The fine patterns shown in FIG. 4 may be formed by attaching each silicon protrusion to an adherend independently, or by modifying the mold so that some silicon protrusions are connected to each other to form silicon fine protrusions of different patterns. .

The size and shape of the fine silicon protrusions can be modified according to the use of the adherend, but there is no limitation, but the method of forming the silicon fine protrusions of the present invention is suitable for molding the fine protrusions having a height of 0.05 to 2 mm. Although the formation interval of the fine silicon protrusions is not limited, it is suitable for forming a fine protrusion pattern having an interval of about 1 to 5 mm, for example.

The silicon protrusion formed in the step is cured through a curing step in a state that is bonded to the mold. When the mold is removed immediately after attaching the liquid silicone rubber to the adherend, there may be a problem that the silicon collapses. In the present invention, such a problem is solved by curing the mold in the state where the mold is placed. It is possible to stably form the branched silicon protrusion.

Of course, the curing conditions may vary depending on the type of liquid silicone rubber used. In the case of room temperature curing type, curing is performed by leaving it alone at room temperature for a predetermined time. In the case of heat curing type, heating is performed at a predetermined temperature. In the case of ultraviolet curing type, curing is performed by irradiation of ultraviolet rays. In general, the most commonly used heat-curable liquid silicone rubber is cured by heating to 80 ~ 200 ℃.

After completion of the curing, the fine silicon protrusion forming mold and the adherend are separated to obtain a molded article having a fine silicon protrusion pattern corresponding to the shape of the mold die. When the mold is separated, a fine shape may be embedded in the mold, so that it may be difficult to remove it. In order to facilitate the transfer of silicon, a nickel teflon coating may be applied to the mold or a mold release agent may be first applied and injected into the mold when the liquid silicone rubber is injected to facilitate extraction. can do.

Hereinafter, a method of forming a fine silicon protrusion according to a continuous process of a roll to roll method will be described.

According to the roll-to-roll method according to an embodiment of the present invention, in the primer coating step to apply a primer to the target site for forming a fine silicon protrusion of the adherend sheet, a printing roll for applying the primer on a specific site or the entire surface Pass it through. The adherend sheet to which the primer is applied is dried by passing through a dryer. Subsequently, the adherend sheet passes through a printing roll for forming a fine silicon protrusion.

As shown in FIG. 5, according to an embodiment of the present invention, fine silicon protrusions may be formed on the adherend by a gravure printing method. In the step of forming the fine silicon protrusion, after filling the liquid silicone rubber into the concave groove of the predetermined shape and pattern formed on the printing roll for forming the fine silicon protrusion, the adherend is placed between the backup roll and the printing roll facing the printing roll. A method of transferring the liquid silicone rubber remaining in the concave groove of the printing roll to the primer coating portion of the adherend may be used. In this case, the sensor may be provided in front of the printing roll for forming the fine silicon protrusion to control the rotational speed of the printing roll for forming the fine silicon protrusion, so that the liquid silicone rubber can be accurately transferred to the primer coating site. The adherend passing through the printing roll for forming the fine silicon protrusion is subjected to a curing step of curing the silicone rubber by a curing method according to the type of liquid silicone rubber used.

[Example]

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by the following Examples.

Artificial leather As adherend  Fine Silicon projection  formation

Preparation of the adherend

In order to form a fine silicon protrusions, as an upper of a shoe, a polyurethane (Polyurethane) impregnated artificial leather was prepared and cut into a size of 200 × 200 mm.

Primer application

In order to apply the primer, a film was made in accordance with the fine silicon protrusion forming part to prepare a silk screen making machine. After fixing the polyurethane impregnated artificial leather, the primer was pushed and applied through the plate making machine. As a primer, DSP-170 primer (Lean Lee) which is a primer for urethane was used.

Primer drying

The DSP-170 primer is a two-component liquid, blended with a main material and a member, and then dried at room temperature after application by a silk screen method, but it is dried for about 60 minutes at about 80 ° C. because it requires a long time to completely dry.

Fine silicon bump molding

In order to mold the silicon protrusions on the dried to-be-adhered body, a mold for forming a fine silicon protrusion as shown in FIG. 6 was manufactured. After placing the molding die in accordance with the primer coating, the liquid silicone rubber (KE-1950-30, Shin-Etsu) was poured on the mold and then pushed into a squeegee several times to form fine silicon bumps.

Silicon projection hardening

The adherend formed with the fine silicon protrusions was placed in a hot air blower and cured by heating at 170 ° C. for 15 minutes.

Extraction of mold for forming fine silicon protrusion

After curing was completed, the mold and the adherend were separated from the hot air blower. As a result, as shown in Figure 7, it was possible to obtain a artificial leather formed with a fine silicon protrusion having a shape and pattern corresponding to the shape of the mold. As shown in FIG. 7, it can be seen that each of the independent silicon microprojections is completely transferred to the urethane-impregnated artificial leather.

Claims (10)

Preparing a fine silicon bump forming adherend;
A primer coating step of applying a primer by a screen printing method using a film in which a predetermined pattern is formed only on a silicon protrusion forming target portion on the adherend;
A primer drying step of drying the applied primer;
After placing a molding die manufactured according to a predetermined shape and pattern according to the primer coating site, the liquid silicone rubber is poured onto the mold and pushed into the squeegee several times to attach the liquid silicone rubber to the primer coating site. And forming a fine silicon protrusion having a pattern;
A fine silicon protrusion curing step of curing the molded fine silicon protrusion while being bonded to a mold; And
A method of forming a fine silicon protrusion having a height of 0.5 to 2 mm and an interval of 1 to 5 mm, including the step of taking out the mold from the adherend after the fine silicon protrusion curing step. delete delete delete delete The method of claim 1, wherein the fine silicon protrusions formed on the adherend are attached to the adherend by being connected to each other independently or in part. delete The method of claim 1, wherein the adherend is a fiber, natural leather, artificial leather, synthetic resin or metal. delete delete

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