KR100748593B1 - Heat adhesive conductive elastomer gasket and Method for the same - Google Patents

Abstract

A thermally adhesive electrically conductive elastomer gasket comprising an electrically conductive thermally adhesive polymer film and an electrically conductive elastomer in which the discharge path and the discharge amount are controlled and discharged and laminated on the electrically conductive thermally adhesive polymer film are disclosed. When heat is applied from the outside, the electrically conductive heat-adhesive polymer film is melted by heat to be electrically and mechanically bonded to the object, and the electrically conductive elastomer, which is not melted by heat, is electrically and elastically contacted with an opposite object.

FIP Gasket, Gasket, Electromagnetic Shielding, Sealing, Dispenser, Pressure sensitive, Adhesive Tape, Hot Melt, Hot Melt Resin, Discharge

Description

Heat adhesive electrically conductive elastomer gasket and its manufacturing method {Heat adhesive conductive elastomer gasket and Method for the same}

1 is a partially cut perspective view illustrating a thermally adhesive electrically conductive elastomer gasket according to an embodiment of the present invention.

2 is a cross-sectional view illustrating an example of modifying the heat-bonded electrically conductive elastomeric gasket of the present invention and its application.

3 is a cross-sectional view showing that the thermally adhesive electrically conductive gasket of the present invention is used in an LCD panel applied to a wireless terminal device such as a cellular phone.

4 is a flow chart illustrating a method of making a thermally adhesive electrically conductive elastomeric gasket of the present invention.

The present invention relates to a thermally conductive electrically conductive elastomer gasket and a method of manufacturing the same, and more particularly, to an electrically conductive thermally adhesive polymer film and an electrically conductive elastomer having a discharge path and a discharge amount controlled and discharged thereon. The electrically conductive thermal adhesive film is melted by external heat and bonded to one object to obtain a reliable and efficient electrical and mechanical bonding with the object, and the electrically conductive elastomer that is not melted by heat is electrically connected to the other object. The present invention relates to a thermally adhesive electrically conductive elastomer gasket and a method of manufacturing the same.

In general, electrically conductive gaskets are used for the purpose of electromagnetic shielding and the stability of mechanical coupling to appliances of electronic and communication equipment.

The types of electrically conductive gaskets are broadly classified into electrically conductive fabric gaskets, metal wire gaskets, metal sheet gaskets, and electrically conductive elastomer gaskets, depending on the purpose and purpose of use.

Among them, electrically conductive elastomer gaskets are used where waterproof, high temperature resistant heat resistance and precise dimensions are required.

The electrically conductive elastomer gasket contains a metal powder mixed with the elastomer, and a thin coating of the electrically conductive elastomer on the electrically conductive elastomer gasket by extruding method, the electrically conductive elastomer gasket by hot press, and the electrically nonconductive elastomer gasket. There is a form in place (FIP) gasket that directly forms an electrically conductive elastomer gasket on an object using one electrically conductive elastomer gasket and a dispenser. Typical manufacturers of these products include Chomerics and Laird Technology in the United States.

In addition, the method of joining the electrically conductive elastomeric gasket to the object includes extrusion, hot pressing, and coated electrically conductive elastomeric gaskets, since these electrically conductive elastomeric gaskets have already been completely hardened and produced so that they do not melt when heated again. Since it cannot have excessive adhesion, it is necessary to make a mechanical groove in the object to insert the gasket, or to temporarily fix it by using a conductive pressure sensitive adhesive tape, or to electrically connect the elastomer to the object. Use separately.

However, according to this bonding method, it is impossible to make a mechanical groove in the object when the electronic and communication equipment is required to be miniaturized and precision, and the double-sided electrically conductive tape has a weak bonding strength, making it difficult to obtain a reliable bonding, and electrically conductive To use the elastomer adhesive separately, the operation is very slow and the cost of the adhesive is not economical.

In addition, in the case of using a double-sided electrically conductive tape, since a release paper is used on one side of the double-sided electrically conductive tape, a separate process that needs to be removed during the work process is required.

Moreover, when the electrically conductive elastomeric adhesive is used separately, it is difficult to mass produce at least 6 hours of curing time. In other words, it is very difficult to reliably bond an already cured electrically conductive elastomeric gasket with an object without a separate mechanical coupling.

In addition, another method is to form an electrically conductive elastomer gasket by directly discharging the electrically conductive elastomer solution onto an object using a CNC robot dispenser, which is a metered discharge device, and is commonly referred to as a form in place (FIP) gasket. In this case, the discharged electrically conductive solution is hardened and is naturally bonded to the object. However, since the dispensing operation is possible only when the object is present, when the object is large, the workability is very low, the movement of logistics is difficult, and the work place of the object is There is a disadvantage that the dispensing equipment must be equipped.

In addition, companies that produce the object has to be equipped with expensive CNC robot dispenser equipment has a disadvantage that a lot of investment costs.

In addition, the discharged solution of the electrically conductive elastomer must be fully cured in order to serve as the electrically conductive elastomer gasket. Since the complete curing time of the conventional electrically conductive elastomer is at least 6 hours, the discharged solution of the electrically conductive elastomer is at least 6 hours. The downside is that you have to wait and do the following:

In some cases, due to the mechanical structure of the object, a CNC robot dispenser cannot form a gasket directly on the object. In other words, the FIP operation cannot be performed because of the structural problem that the nozzle part of the CNC robot dispenser cannot access the object.

In addition, when a conventional FIP gasket is used between a panel of a 40-inch PDP or TFT LCD and a frame that mechanically protects it, it is difficult to apply due to the waiting time between processes and the movement and location of the object.

As such, other electrically conductive elastomeric gaskets, except for conventional FIP gaskets, have difficulty in making reliable and economical electrical and mechanical bonding with the corresponding objects according to the miniaturization and precision of electronic and communication devices. There are many parts that are difficult to apply in mass production, such as logistics movement, waiting time between processes, and securing storage places.

Accordingly, the present invention is proposed to solve such a conventional problem, and an object of the present invention is to provide a thermally adhesive electrically conductive elastomer gasket that can be electrically and mechanically reliably bonded to an object.

Another object of the present invention is to provide a thermally adhesive electrically conductive elastomeric gasket that can be bonded by heat without the need for a separate bonding mechanism and is easy to bond.

It is a further object of the present invention to provide a thermally adhesive electrically conductive elastomer gasket that can be easily applied to an object having structural limitations that are not possible to work with FIP.

It is a further object of the present invention to provide a thermally adhesive electrically conductive elastomeric gasket having elasticity, making it electrically conductive between objects, and economical and practical.

Moreover, another object of the present invention can be reliably bonded to the object regardless of the size of the object without disturbing other processes at the work site of the object, and economical heat adhesion that minimizes the movement of logistics or waiting time An electrically conductive elastomer gasket is provided.

It is still another object of the present invention to provide a thermally adhesive electrically conductive elastomeric gasket capable of reliably bonding a plurality of electrically conductive elastomeric gaskets to the object in one shape suitable for use in the object.

It is still another object of the present invention to provide a method for producing the gasket.

Other objects and features of the present invention will be more clearly understood through the preferred embodiments described below.

The heat-adhesive electrically conductive elastomer gasket of the present invention comprises an electrically conductive heat-adhesive polymer film and an electrically conductive elastomer in which the discharge path and the discharge amount are controlled and discharged and laminated on the electrically conductive heat-adhesive polymer film.

Preferably, the discharge path and the discharge amount can be controlled by the CNC robot dispenser.

Preferably, the electrically conductive heat-adhesive polymer film is filled with a metal powder in the electrically non-conductive heat-adhesive polymer film, the electrically non-conductive heat-adhesive polymer film may be applied to any one of polyester, polyurethane, polyamide, EVA or epoxy. have.

In addition, the electrically conductive elastomer is filled with a metal powder in the electrically nonconductive elastomer, preferably the electrically nonconductive elastomer may be silicon.

Moreover, the metal powder filled in the electrically nonconductive elastomer and the electrically nonconductive thermally adhesive polymer film may be either nickel, copper or silver.

According to the method of manufacturing the thermally adhesive electrically conductive elastomer gasket of the present invention, the step of improving the adhesion by modifying the surface of the electrically conductive thermally adhesive polymer film through plasma or corona treatment is performed by plasma or corona treatment. ; Processing and cutting the electrically conductive heat-adhesive polymer film surface-treated into a form suitable for the subject; Discharging room temperature vulcanizing electrically conductive liquid silicon onto the cut electrically conductive heat-adhesive polymer film; And curing the discharged silicon at room temperature.

Preferably, the curing time can be reduced by increasing the temperature and humidity of the curing atmosphere in the curing step, the temperature should be increased below the heat distortion temperature of the electrically conductive heat-adhesive polymer film.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention.
In the following description, the "electroconductive heat-adhesive polymer film" is an electrically conductive polymer that melts when applied with heat and adheres to an opposing object, and solidifies when heat is removed, thereby stably maintaining the state of adhesion with the object. Refers to the film, also known as hot melt film through electricity. "Electric non-conductive heat-adhesive polymer film" refers to an electrically conductive polymer film, ie a hot melt film.
In addition, "electrically conductive elastomer" refers to an elastomer through which electrically conductive powder such as metal is mixed with an electrically nonconductive elastomer. For example, when a metal powder is uniformly mixed with a liquid electrically nonconductive silicon and cured by heat and moisture, it becomes a solid electrically conductive silicon, which is a kind of electrically conductive elastomer. "Electrically nonconductive elastomer" refers to an elastomer that is not electrically conductive, such as rubber, because it is not mixed with electrically conductive powder.

1 is a partially cut perspective view illustrating a thermally adhesive electrically conductive elastomer gasket according to an embodiment of the present invention.

As shown, the thermally adhesive electrically conductive elastomer gasket consists of an electrically conductive thermally adhesive polymer film 20 and an electrically conductive elastomer 10 bonded thereon, the electrically conductive elastomer 10 being, for example, a CNC robot. It discharges according to the discharge path and discharge amount which were determined by the dispenser etc.

As will be described later, the electrically conductive thermally adhesive polymer film 20 is melted by heat on the object to be firmly bonded and mechanically and electrically bonded, and the electrically conductive elastomer 10 is not melted by heat and is opposed to another object to be opposed. Electrically and elastically bonded.

The electrically conductive thermal adhesive polymer film 20 is made of metal powder filled in the electrically nonconductive thermal adhesive polymer film.

Preferably, the electrically nonconductive heat-adhesive film may apply any one of polyester, polyurethane, polyamide, EVA or epoxy.

The electrically conductive elastomer is made of metal powder filled in an electrically nonconductive elastomer including silicon and the like.

Nickel, copper, or silver may be used as the metal powder to be filled in the electrically nonconductive elastomer and the electrically nonconductive thermal adhesive polymer film.

2 is a cross-sectional view illustrating an example of modifying the heat-bonded electrically conductive elastomeric gasket of the present invention and its application.

As shown, two electrically conductive elastomers 10 and 10a are formed on one electrically conductive heat-adhesive polymer film 20.

This configuration can be used by appropriately cutting a plurality of electrically conductive elastomers (10, 10a) side by side on one electrically conductive thermal adhesive polymer film 20 as needed.

For example, a groove or a sleeve 110 is formed in the object 100, and the conductive conductive gasket may be usefully applied to the sleeve 110 including a bent portion.

In the case of using a conventional FIP gasket, it is almost impossible to apply the electrically conductive gasket to the sleeve 110 due to mechanical limitations, but the electrically conductive gasket of the present invention has an advantage that it can be easily applied without a separate tool. .

Particularly, when the size of the sleeve is minute, it is difficult to apply a discharge device for discharging silicon, but in the case of the present invention, the electrically conductive thermal bonding gasket manufactured in Seoxi can be melted and joined by heating, and the like. It is not affected by the mechanical structure.

3 is a cross-sectional view showing that the thermally adhesive electrically conductive gasket of the present invention is used in an LCD panel applied to a wireless terminal device such as a cellular phone.

As shown, the thermally adhesive electrically conductive gasket of the present invention is interposed between the housing 50 and the LCD panel 60 of the wireless terminal device to elastically press the housing 50 and the LCD panel 60 to each other. At the same time, there is an advantage that can shield electromagnetic waves emitted from the LCD panel 60.

4 is a flow chart illustrating a method of making a thermally adhesive electrically conductive elastomeric gasket of the present invention.

First, an electrically nonconductive thermal adhesive film of any one of polyester, polyurethane, polyamide, EVA or epoxy is filled with a metal powder of any one of nickel, copper or silver to prepare an electrically conductive thermal adhesive polymer film.

The electrically conductive heat-adhesive polymer film is modified by plasma or corona treatment to improve the adhesive force by modifying the surface of the electrically conductive heat-adhesive polymer film (step S41).

Next, the electrically conductive heat-adhesive polymer film is processed and cut into a form suitable for the object by a cutting press or the like (step S42).

Room temperature vulcanizing electrically conductive liquid silicon is ejected to the processed form by using a discharge device attached to a CNC robot or the like on the cut electrically conductive thermally bonded polymer film (step S43).

The discharged silicon is cured at room temperature (step S44). At this time, since the curing time can be reduced by increasing the temperature and humidity, it is preferable to appropriately increase the temperature and humidity. However, if the temperature is increased, the polymer film may be thermally deformed, so the temperature should be increased below the heat deflection temperature.

When the heat-bonded electrically conductive elastomeric gasket thus prepared is placed on the object and heated, the polymer film melts to be firmly bonded to the object, thereby improving the reliability of the bonding with the object, and the electrically conductive elastomer that is not melted by heat is opposed to the heat-sensitive electrically conductive elastomer gasket. It is in electrical and elastic contact with another object.

In the above described the center of the preferred embodiment of the present invention, it can be variously changed at the level of those skilled in the art. Therefore, the scope of the present invention should not be limited to the above embodiments but should be determined by the claims described below.

As described above, the present invention has various advantages.

Conventionally, it was necessary to make a mechanical groove in the object, use a double-sided electrically conductive tape having a weak bonding strength, or use a separate electrically conductive elastomeric adhesive. However, according to the present invention, a separate adhesive or a mechanical groove is not used. There is an advantage that can be firmly bonded.

In addition, since the gasket can be bonded to the object by heating, compared to the case of using a conventional FIP gasket or an electrically conductive elastomer adhesive, there is an advantage in that workability is greatly reduced and workability is improved.

In addition, since the gasket is bonded without a separate tool, as in the case of the conventional FIP gasket, the waiting time or storage space between processes caused by placing the silicon discharge device on the work site or moving the gasket itself to the position where the silicon discharge device is located. Problems such as securing can be fundamentally solved.

In addition, since the silicone solution before curing is cured by discharging onto the heat-adhesive polymer film, a strong adhesive force can be obtained, and if necessary, the surface of the heat-adhesive polymer film is subjected to plasma or corona treatment before discharging the silicone solution. By doing so, there is an advantage that the adhesion can be further enhanced.

Claims (11)

A heat-bonded electrically conductive elastomer gasket, comprising: an electrically conductive heat-adhesive polymer film, and an electrically conductive elastomer in which the discharge path and the discharge amount are controlled and discharged and laminated on the electrically conductive heat-adhesive polymer film. 2. The thermally adhesive electrically conductive elastomer gasket according to claim 1, wherein the electrically conductive thermally adhesive polymer film is filled with a metal powder in an electrically nonconductive thermally adhesive polymer film. 3. The thermally adhesive electrically conductive elastomer gasket of claim 2 wherein the electrically nonconductive thermally adhesive polymer film is any one of polyester, polyurethane, polyamide, EVA or epoxy. 2. The thermally adhesive electrically conductive elastomer gasket according to claim 1, wherein the electrically conductive elastomer is filled with a metal powder in an electrically nonconductive elastomer. The thermally adhesive electrically conductive elastomer gasket according to claim 2 or 4, wherein the metal powder is any one of nickel, copper or silver. 5. The thermally adhesive electrically conductive elastomer gasket of claim 4 wherein the electrically nonconductive elastomer is silicon. A thermally adhesive electrically conductive elastomer, comprising: an electrically conductive thermally bonded polymer film whose surface is plasma or corona treated; and an electrically conductive elastomer in which the discharge path and the discharge amount are controlled and discharged and laminated on the surface of the electrically conductive thermally adhesive polymer film. Gasket. 8. The thermally adhesive electrically conductive elastomer gasket according to claim 1 or 7, wherein the discharge path and the discharge amount are controlled by a CNC robot dispenser. Modifying the surface of the electrically conductive thermally bonded polymer film through plasma or corona treatment to improve adhesion to later discharged electrically conductive silicone; Processing and cutting the surface treated electrically conductive thermal adhesive polymer film into a form suitable for an object; Discharging room temperature vulcanizing electrically conductive liquid silicon to be processed on the cut electrically conductive thermally bonded polymer film; And The method of manufacturing a thermally adhesive electrically conductive elastomer gasket, characterized in that the step of curing the discharged silicon at room temperature. 10. The method of claim 9, wherein the temperature and humidity of the curing atmosphere is increased in the curing step. The method of claim 10, wherein the temperature is increased below a heat deflection temperature of the electrically conductive heat adhesive polymer film.

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