KR101245164B1 - Thermal foam gasket - Google Patents

Abstract

PURPOSE: A thermal foam gasket is provided to effectively emit heat generated from the heat source such as an electronic product to the outside, thereby maximizing heat dissipation efficiency. CONSTITUTION: A sponge(110) comprises an inside elastomer. A heat conductive layer(140) is formed on the exterior of the sponge. An adhesive layer(120) fixes the sponge and the heat conductive layer. The heat conductive layer is formed in either graphite or graphene. A small fragments separation protection coating layer is equipped in a cut surface formed by the cut.

Description

Thermally Conductive Foam Gaskets {THERMAL FOAM GASKET}

The present invention relates to a thermally conductive foam gasket, and more particularly, a heat dissipation and heat conduction efficiency that is capable of dissipating heat to the outside by attaching to a heat source such as an electronic product using a gasket formed of a graphite or graphene sheet. A thermally conductive foam gasket.

Generally, electronic products such as computers, mobile phones, and televisions generate a lot of heat when they are continuously used. This heat must be able to be discharged directly to the outside, or parts inside the electronics, such as electronics, may fail, shorten the life of the product, and may cause malfunctions and fires.

At this time, as a material for dissipating heat, a graphite sheet having excellent heat transfer efficiency or a thermal pad in which thermal conductive powder is added to a silicone resin is used. It has to be thick, and there are a number of problems

For example, in the case of graphite sheets, the heat transfer is high and the heat transfer efficiency is very good at 200 to 1000 W / mK in the horizontal direction of the sheet, but the heat transfer efficiency is inferior to 20 W / mK in the vertical direction. There is a problem, and it is also a direct factor in the cost increase of the sheet. In addition, for high heat transfer, the adhesion between the apparatus such as heat generation and heat dissipation and the heat transfer medium is very important, but the graphite sheet has almost no cushioning and thus has a problem of adhesion.

In the case of the thermal pad, the heat transfer efficiency is significantly lower than that of graphite, and when the thermal pad is thicker, the thermal pad also has a disadvantage in that the thermal efficiency is also lowered.

Background art related to the present invention is Republic of Korea Patent Publication No. 10-0755014 (2007. 08. 28. registration), the document is a method for producing a graphite heat radiation sheet coated with a thermally conductive adhesive and the graphite produced by A heat dissipation sheet is disclosed.

An object of the present invention by using a thermally conductive foam gasket formed of a graphite or graphene sheet outer shell, it is possible to effectively discharge the heat generated from a heat source such as electronic products to the outside, even if the interval between the heat source and the heat radiating unit heat dissipation efficiency It is to provide this excellent thermally conductive foam gasket.

Thermal conductive foam gasket according to an embodiment of the present invention for achieving the above object is a sponge having an elastic inside; And a thermally conductive layer formed on the outer surface of the sponge, wherein the adhesive layer fixes two layers between the sponge and the thermally conductive layer, wherein the thermally conductive layer is a graphite or graphene sheet.

In addition, the thermally conductive layer is preferably bonded to the outer surface of the sponge by an adhesive, the kind of adhesive is a hot melt, such as PU-based, acrylic, PET-based, or silicone or fluorine resin, melamine when heat resistance is required It may be a resin adhesive.

In addition, the sponge having elasticity may be used as long as it has elasticity such as PU sponge, acrylic sponge, CR sponge, EPDM sponge, and if a heat resistance is required, a single material sponge such as silicone, fluororesin, or silicone Heat-resistant sponge of the composite material impregnated and coated with a sponge of PU, acrylic, CR, EPDM, etc. may be used in the solution.

In addition, the first base film may be attached to one surface of the graphite sheet in order to secure mechanical strength such as bending resistance, tensile force, and carbon powder generation of the graphite sheet, which is the thermal conductive layer. The second base film can be further attached.

In addition, the graphite sheet is preferably formed to a thickness of 10 ~ 500㎛.

In addition, the first base film and the second base film is a polyethylene terephthalate (PET) film, polyethylene (PE) film, polypropylene (PP) film, ethylene vinyl acetate (EVA) film, polyvinyl chloride (PVC) film , Polyimide (PI), polyvinylidene chloride (PVDC) film, polycarbonate (PC) and acrylic resin film, it is preferably formed of a material of a metal thin film (aluminum, copper, nickel, etc.).

In addition, in order to facilitate the use of the thermally conductive foam gasket, a thermally conductive adhesive may be attached to an outermost surface or a plurality of surfaces of the thermally conductive foam gasket to increase the utilization thereof, and the thermally conductive adhesive may be acrylic based with the addition of a thermally conductive powder. Or when it requires heat resistance, it is preferable that it is a silicone type adhesive.

In addition, in the case where the thermally conductive layer is graphite, it is preferable to coat PU, acrylic, silicone fluorocarbon resin, etc. on the cut surface in order to allow the graphite-specific debris to fall off from the cut surface side.

The thermally conductive foam gasket according to the present invention is easy to use by attaching to a heat source such as an electronic product and can effectively release heat generated from a heat source such as an electronic product to the outside.

In addition, even if the distance between the heat generating source and the heat radiating portion has an advantage of excellent heat dissipation and heat transfer efficiency.

1 illustrates a thermally conductive foam gasket according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating a portion A configuration of FIG. 1.
3 shows a thermally conductive foam gasket according to another embodiment of the present invention.
Figure 4 shows the debris prevention coating layer of the thermally conductive foam gasket according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

Hereinafter, a thermally conductive foam gasket having excellent heat dissipation and thermal conductivity efficiency according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows a thermally conductive foam gasket excellent in heat dissipation and thermal conductivity efficiency according to an embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating a portion A configuration of FIG. 1.

Referring to FIG. 1, the thermally conductive foam gasket 100 includes a sponge 110 and a thermally conductive layer 140. The thermally conductive foam gasket 100 shown in Figure 1 is shown by cutting to a predetermined length.

As a material of the sponge 110 which is an internal elastic body, it can be used as long as it has cushioning property and elasticity such as PU sponge, acrylic sponge, CR sponge, EPDM sponge, and the like.

The sponge 110, which is an internal elastic body, is not limited in thickness and size, but in the case of thickness, it is preferable to mold to 1 mm or more. When the thickness of the sponge 110 is 1 mm or less, the effects of cushioning and elasticity are insufficient.

The thermal conductive layer 140 is formed on the outer surface of the sponge 110.

The thermal conductive layer 140 is preferably formed of one of graphite or graphene sheets. Hereinafter, the thermal conductive layer 140 will be described as being formed of graphite. The heat conductive layer 140 may be attached to the outer side of the first base film 130 to compensate for mechanical strength such as bending resistance and tensile strength. Also. When the first base film 130 and the second base film 150 are formed at both sides of the thermal conductive layer 140, the mechanical strength may be further improved.

In addition, the first base film 130 and the second base film 150 are polyethylene terephthalate (PET) film, polyethylene (PE) film, polypropylene (PP) film, ethylene vinyl acetate (EVA) film, polyvinyl chloride (PVC) film, polyimide (PI), polyvinylidene chloride (PVDC) film, polycarbonate (PC) and acrylic resin film, metal thin film (such as aluminum, copper, nickel, etc.) desirable.

The thickness of the thermal conductive layer 140 formed of a graphite sheet is preferably formed to a thickness of 10 ~ 500㎛. However, when the thermal conductive layer 140 is graphene, it may be formed of only the thermal conductive layer 140 and the second base film 150.

The thermal conductive layer 140 is preferably bonded to the outer surface of the sponge 110, which is an internal elastic body, by the adhesive 120. At this time, the material of the adhesive layer 120 is preferably a hot melt, such as PU, acrylic, PET.

In order to facilitate the use of the thermally conductive foam gasket, the thermally conductive adhesive 160 layer may increase the utilization by attaching the thermally conductive adhesive 160 to the outermost surface or the plurality of surfaces of the thermally conductive foam gasket. At this time, the thermally conductive adhesive 160 is preferably any one of acrylic, silicone, and PU-based resin to which the thermally conductive powder is added. At this time, the thermally conductive powder is preferably any one or a plurality of kinds of CNT, carbon, alumina and metal powder is added.

In addition, as the thickness of the thermally conductive adhesive 160 is in a range that does not interfere with adhesive force with a heating element such as an electronic product, the thinner, the better the effect.

The release film 170 is formed on the outer side of the thermally conductive adhesive 160 to protect the thermally conductive adhesive 160 until it is attached to the heat generating source. When the release film 170 is attached to a heating source such as an electronic product, the release film 170 may be easily peeled off and used.

2, only a portion of the thermally conductive foam gasket is shown. In FIG. 2, the following configuration is shown based on the sponge 110, which is an internal elastic body, and the thermally conductive adhesive 160 at the bottom contacts the heating source.

3 shows a thermally conductive foam gasket according to another embodiment of the present invention.

The thermally conductive foam gasket illustrated in FIG. 3 may include a heat resistant sponge 210, a heat resistant adhesive 220, and a heat resistant adhesive 260.

In the case of the thermally conductive foam gasket shown in FIG. 3, the other elements are the same as those shown in FIG. 1.

The heat-resistant sponge 210 may be a heat-resistant sponge of a composite material obtained by impregnating and coating a sponge such as PU, acrylic, CR, and EPDM in a single-material sponge such as silicone or fluororesin or a solution such as silicon or fluororesin.

The heat-resistant adhesive 220 is preferably made of silicone or fluororesin adhesive.

The thermally conductive heat-resistant adhesive 260 is preferably a silicone pressure-sensitive adhesive to which a thermally conductive powder is added.

Figure 4 shows the debris prevention coating layer of the thermally conductive foam gasket according to an embodiment of the present invention.

Referring to FIG. 4, since the debris preventing coating layer 310 is used by cutting the thermally conductive foam gasket 100 to a predetermined length, the debris peculiar to the graphite can be prevented from falling off from the cut surface side. At this time, the debris prevention coating layer 310 is preferably coated with a method such as spraying, dipping, stamping PU, acrylic, silicone, fluororesin, etc. on the cutting surface.

The debris prevention coating layer 310 is preferably added to any one or a plurality of types of thermally conductive powder of CNT, carbon, alumina and metal powder to the coating resin liquid to increase the thermal conductivity.

In addition, the thickness of the debris prevention coating 310 layer is preferably about 2 ~ 10㎛. The debris preventing coating layer 310 is coated to approximately 2mm in order to prevent degradation of durability and to prevent the boundary line with the thermally conductive foam gasket, more preferably the width of the coating portion is the cutting surface of the thermally conductive foam gasket It is preferable to coat the outer skin about 0.5 to 5 mm from the cut portion.

Thermal conductivity  compare Example

Hereinafter, the present invention will be described in more detail with reference to specific embodiments of the thermally conductive foam gasket 100. However, this is to help the understanding of the present invention, but the present invention is not limited thereto.

Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

1. Preparation of Psalms

Example

A thermally conductive foam gasket having a width of 28 mm, a length of 28 mm, and a height of 8 mm was used.

In addition, the thermal conductive layer was used as a graphite sheet thickness of 200㎛, the inner elastic sponge was carried out by using a composite heat-resistant sponge impregnated with a PU sponge in a silicone resin solution.

Comparative example

A thermal pad with thermal conductive powder added to the silicone resin, which is currently attached to the heating source of the LCD TV of the parent company, 28mm wide by 28mm long and 7mm high, was used.

2. Heat conduction evaluation

This test first measures the thickness of the thermally conductive foam gasket sample and then preheats the bottom plate of the thermal conductivity tester to 150 ° C. Thereafter, the sample is placed on the lower surface plate, and then the upper surface plate is raised and a weight of 1 kg is placed thereon.

Next, after checking the temperature gauge of the upper plate and measuring the time from 40 ℃, when the temperature reaches 80 ℃, the buzzer of the thermal conductivity tester sounds. Therefore, the time to reach the upper surface from the lower surface is measured until it becomes 40 to 80 degreeC.

The thermal conductivity test results are shown in Table 1. Referring to Table 1, first, the heat conduction time of the comparative example was measured to be 6 minutes and 13 seconds. However, the heat conduction time of the example was measured 4 minutes 20 seconds. Therefore, it can be seen that the thermally conductive foam gasket of the embodiment is much faster thermal conductivity.

Table 1

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100: thermally conductive foam gasket 110: sponge
120: adhesive 130: first substrate film
140: heat conductive layer 150: second substrate film
160: thermally conductive adhesive 170: release film
210: heat resistant sponge 220: heat resistant adhesive
260: thermally conductive heat-resistant adhesive 310: debris prevention coating layer

Claims (13)

Sponges that are internal elastic bodies; And
It includes; a heat conductive layer formed on the outer surface of the sponge,
Including; an adhesive layer for fixing the sponge and the thermal conductive layer,
The heat conductive layer is formed of one of graphite or graphene,
The thermally conductive foam gasket comprising the sponge, the thermally conductive layer and the adhesive layer is cut and used to a predetermined length, and a thermally conductive foam gasket is further formed on the cut surface formed by the cutting to form a debris preventing coating layer. .
delete The method of claim 1,
The debris prevention coating layer
A thermally conductive foam gasket, characterized in that formed from a thermally conductive material.
The method of claim 1,
At least one of the sponge and the adhesive layer is
A thermally conductive foam gasket, characterized in that formed from a heat resistant material.
The method of claim 1,
At least one of the sponge and the adhesive layer is
A thermally conductive foam gasket, characterized in that formed of a non-heat resistant material.
5. The method of claim 4,
The sponge
A thermally conductive foam gasket, wherein at least one of silicone and fluorine resin is impregnated.
The method of claim 1,
The thermal conductive layer is
A thermally conductive foam gasket, characterized in that the first base film is formed on one surface.
The method of claim 7, wherein
The thermal conductive layer is
The thermally conductive foam gasket, characterized in that the second base film is further formed on the other side to reinforce the mechanical strength.
9. The method of claim 8,
The first substrate film and the second substrate film
Polyethylene terephthalate (PET) film, polyethylene (PE) film, polypropylene (PP) film, ethylene vinyl acetate (EVA) film, polyvinyl chloride (PVC) film, polyimide (PI), polyvinylidene chloride (PVDC) A thermally conductive foam gasket, characterized in that it is formed of one of a film, a polycarbonate (PC) and an acrylic resin film metal thin film.
The method of claim 1,
Graphite as the thermal conductive layer
Thermally conductive foam gasket, characterized in that formed to a thickness of 10 ~ 500㎛.
The method of claim 1,
A thermally conductive foam gasket, characterized in that a thermally conductive adhesive is further formed on at least one surface or a plurality of surfaces of the thermally conductive foam gasket to be in contact with a heat source.
The method of claim 11,
The thermally conductive adhesive
A thermally conductive foam gasket, wherein any one or a plurality of kinds of functional additives, such as CNT, carbon, alumina, and metal powder, are added to any one of acrylic, silicone, and PU resin.
The method of claim 11,
The thermally conductive adhesive
A thermally conductive foam gasket, characterized in that formed from a heat resistant material.

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