KR20110085222A - Halogen free in-plane thermal conductive sheet with roll type and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A roll type non-halogen-based in-plane thermoconductive sheet is provided to ensure excellent flexibility and excellent environment-friendliness and durability since the base resin of an in-plane thermoconductive layer is made of non-halogen-based elastomers having constant hardness. CONSTITUTION: A method for preparing a roll type non-halogen-based in-plane thermoconductive sheet comprises the steps of: (i) injecting 100 parts by weight of a base resin and 300~500 parts by weight of flake graphite particles in a pressurized distributed mixer, and mixing the mixture at 100~140°C to form the mixture, wherein the base resin comprises at least one kind of non-halogen-based elastomers in which the hardness according to an ASTM D-2240 method is 50~95 Shore A; and (ii) molding the mixture with a calendar having the roller surface temperature of 50~80 °C to form a horizontal thermoconductive layer(10).

Description

Halogen free in-plane thermal conductive sheet with roll type and manufacturing method

The present invention relates to a roll-type non-halogen-based horizontal thermal conductive sheet and a method for manufacturing the same, and more particularly, to a halogen-based resin having a high horizontal thermal conductivity, including graphite particles having a high content by using a calendering method. The present invention relates to a non-halogen-based horizontal thermal conductive sheet of an environmentally friendly roll type, and a method of manufacturing the same.

In recent years, electronic devices require a large number of electronic components to be installed in a narrow space according to the trend of light and small size, and the amount of heat generated per unit volume is greatly increased. Therefore, the need for heat dissipation means for effectively dissipating the heat generated from the heat source in order to prevent the deterioration of the electronic device is emerging.

Accordingly, heat sinks and heat radiating fans are used as means for effectively dissipating heat generated from electronic devices. Although these heat dissipation means have a large heat dissipation effect, they are difficult to be employed in the field of flat panel displays having a thin thickness due to their large volume. Therefore, the heat dissipation means employable in the field of flat panel display should be provided in the form of a sheet in order to reduce its volume. The heat dissipation means provided in the form of a sheet is mainly used an expanded graphite sheet rolled after expanding a thin metal of copper or aluminum or natural graphite, or a sheet filled with thermal conductive powder on a resin such as silicone or acrylic. However, in the case of a sheet made of metal, the specific gravity is large, which limits the weight of the product, and there is no difference in thermal conductivity in each direction. Therefore, the heat transfer path can absorb heat quickly in the thickness direction (vertical direction). However, there is a problem in that a hot spot is partially generated because heat cannot be diffused quickly in a plane direction (horizontal direction) of which the length of the heat transfer path is long. In addition, the metal has a problem that the manufacturing cost is increased because of the high price. Sheets made of expanded graphite are useful in terms of being able to compensate for the shortcomings of sheets made of metal, but there is a problem in that a top surface coating is required to prevent surface peeling and dust generation. In addition, the sheet made of resin has a low heat conductivity in the horizontal direction due to the characteristics of the material, so the heat dissipation effect is small, and there is a problem that the handling is difficult due to excessive flexibility.

In order to solve the above problems, a roll type horizontal thermal conductive sheet having a form in which graphite particles are dispersed on a base resin has appeared. Referring to the conventional manufacturing method, graphite particles may be formed of silicone resin or chlorinated polyethylene (CPE) rubber and It is added to a liquid base resin containing a solvent and stirred to form a thermally conductive slurry composition (or thermally conductive paste composition), which is coated on a base film by a casting method, and then the solvent is removed by heat treatment such as drying and the rest. Consisting of solidifying the composition.

However, the conventional roll type horizontal heat conductive sheet manufacturing method uses the casting processing method which apply | coats the liquid resin raw material containing graphite particle on a flat base film, removes a solvent, and forms a sheet, In this case, a base film shape In order to uniformly apply the thermally conductive slurry composition to the graphite, the content of the graphite particles in the thermally conductive slurry composition must be less than 50% by weight in order to produce a commercially valuable horizontal thermally conductive sheet. There is a problem in that no horizontal thermal conductivity can be obtained. In addition, the conventional method of manufacturing a roll-type horizontal thermal conductive sheet has a problem that the thermal conductivity of the resin is too low when the silicone resin is used as the base resin, and is constant when chlorinated polyethylene (CPE) rubber is used as the base resin. The level of thermal conductivity can be guaranteed and its handling is easy, but there is a problem that chlorinated polyethylene (CPE) rubber is not environmentally friendly because it contains about 30% by weight of chlorine (Cl).

The present invention has been made to solve the above problems, the present invention has a high horizontal thermal conductivity, including a high content of graphite particles, does not contain a halogen-based resin, environmentally friendly non-halogen-based horizontal It is an object to provide a thermally conductive sheet and a method of manufacturing the same.

In order to achieve the object of the present invention, the present invention is kneaded and dispersed in 100 parts by weight of the base resin consisting of at least one non-halogen-based elastomer having a hardness of 50 ~ 95 Shore A according to ASTM D-2240 method and the base resin Provided is a roll-type non-halogen-based horizontal thermal conductive sheet having a horizontal thermal conductive layer formed of a kneaded material containing 300 to 600 parts by weight of flake graphite particles. In the non-halogen-based horizontal heat conducting sheet of the roll type according to the present invention, the kneaded material may further include 1 to 3 parts by weight of a lubricant kneaded and dispersed in a base resin. In addition, the non-halogen-based horizontal thermal conductive sheet of the roll type according to the present invention may preferably further include an adhesive layer laminated on one or both sides of the horizontal thermal conductive layer. In addition, the non-halogen-based horizontal thermal conductive sheet of the roll type according to the present invention may preferably further include an electrical insulating layer laminated on one surface of the horizontal thermal conductive layer.

In order to achieve the other object of the present invention, the present invention (a) 100 parts by weight of base resin and flake graphite (Flake) consisting of at least one non-halogen-based elastomer having a hardness of 50 ~ 95 Shore A according to ASTM D-2240 method Graphite) to 300 to 500 parts by weight of particles in a pressure dispersion kneader and kneading at 100 ~ 140 ℃ to form a kneaded material; And (b) forming the kneaded material with a calender having a roller surface temperature of 50 to 80 ° C. to form a horizontal heat conductive layer. . In the method for manufacturing a non-halogen-based horizontal thermal conductive sheet of a roll type according to the present invention, the step (a) is preferably characterized in that 1 to 3 parts by weight of the lubricant is further added to the pressure dispersion kneader and kneaded to form a kneaded product. .

In addition, the method for producing a roll-type non-halogen-based horizontal thermal conductive sheet according to the present invention preferably comprises the steps of: (c) attaching a thermally conductive double-sided tape to one or both sides of the horizontal thermal conductive layer to form a thermally conductive adhesive layer; It may further include. At this time, the thermally conductive double-coated tape is formed by applying a thermally conductive adhesive on both sides of the tape, the thermally conductive adhesive is alumina powder, boron nitride to any one selected from the group consisting of silicone pressure sensitive adhesive, acrylic pressure sensitive adhesive, and epoxy pressure sensitive adhesive (Boron Nitride, BN) powder, nickel powder, copper powder, and is characterized in that formed by filling one or more thermally conductive fillers selected from the group consisting of silver powder. In addition, the thermally conductive double-sided tape is any one of a pressure-sensitive adhesive selected from the group consisting of a silicone pressure sensitive adhesive, an acrylic pressure sensitive adhesive, and an epoxy pressure sensitive adhesive on both sides of a thermally conductive foil substrate made of aluminum, copper, nickel, or a combination thereof. It is characterized by being formed by coating.

In addition, the method for producing a non-halogen-based horizontal thermal conductive sheet of the roll type according to the present invention preferably further comprises the step of (d) adhering an electrical insulating tape to one surface of the horizontal thermal conductive layer to form an electrical insulating layer; Can be.

Since the horizontal heat conduction layer of the non-halogen-based horizontal heat conduction sheet of the roll type according to the present invention is manufactured by a calendering method, it is composed of a low content of base resin and a high content of graphite graphite particles, and thus 20 W / It has a high horizontal thermal conductivity of m · K or more. In addition, the roll-type non-halogen-based horizontal thermal conductive sheet according to the present invention is environmentally friendly, excellent durability and excellent flexibility (or flexibility) because the base resin of the horizontal thermal conductive layer is made of a non-halogen-based elastic body having a certain hardness When applied to electronic devices, it has excellent adhesion to external panels, effectively dissipates and removes heat generated in electronic devices, and has excellent adhesion to thermally conductive tapes, so that the horizontal thermal conductive layer and thermal conductivity due to external shock or heat generated inside Since the bonding between the adhesive layers is maintained as it is, providing reliability in solving the thermal management of the electronic device, and having a certain level of melt flow index, it is easy to form a horizontal thermal conductive layer and to manufacture a roll type horizontal thermal conductive sheet.

1 shows a laminated structure of a non-halogen-based horizontal thermal conductive sheet according to an embodiment of the present invention.
Figure 2 shows the manufacturing process of the non-halogen-based horizontal thermal conductive sheet shown in Figure 1 of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the following will describe a preferred embodiment of the present invention, but the technical idea of the present invention is not limited thereto and may be variously modified and modified by those skilled in the art.

One aspect of the present invention is a non-halogen-based horizontal thermal conductive sheet, in particular, has a high horizontal thermal conductivity, including a high content of graphite particles, do not include a halogen-based resin to an environmentally friendly roll-type non-halogen-based horizontal thermal conductive sheet It is about.

1 shows a laminated structure of a non-halogen-based horizontal thermal conductive sheet according to an embodiment of the present invention.

As shown in FIG. 1, the non-halogen-based horizontal thermal conductive sheet according to the present invention includes a horizontal thermal conductive layer 10 formed of a kneaded material including flake graphite particles kneaded and dispersed in a base resin. In addition, the non-halogen-based horizontal thermal conductive sheet according to the present invention may further include a thermally conductive adhesive layer 20 laminated on one surface of the horizontal thermal conductive layer. Although not shown in FIG. 1, the thermally conductive adhesive layer may be laminated on both sides of the horizontal thermal conductive layer.

level Heat conduction layer

The horizontal thermal conductive layer 10 is formed in a sheet form in which a kneaded material including flake graphite particles kneaded and dispersed in a base resin is molded by using a calendering method.

The flaky graphite is a graphite having a crystalline flake form. In the present invention, the flaky graphite includes not only flaky graphite in its natural form, but also expanded graphite in which it is expanded. The flaky graphite particles preferably have a density of about 2.0 to 2.5 g / cm 3 and an average particle diameter of about 1 μm to 1 mm. The content of flaky graphite in the horizontal heat conductive layer is about 300 to 600 parts by weight, preferably 400 to 500 parts by weight, based on 100 parts by weight of the base resin described later. When the content of flaky graphite is less than 300 parts by weight, the horizontal thermal conductivity of the horizontal heat conductive layer is not high, such as less than 20 W / mK, and when the content of flaky graphite exceeds 600 parts by weight, the flaky graphite is kneaded into the base resin to be uniformly dispersed. It is difficult to make it, the bonding strength with the base resin is difficult, so it is difficult to form the sheet even by calendering, and the amount of the base resin is so small that the flexibility (or flexibility) of the finally formed horizontal heat conductive sheet is inferior. Due to this, it is difficult to manufacture a horizontal thermal conductive sheet in a roll type, and its application range is very narrow due to poor adhesion in the application of electronic devices. When the content of the flaky graphite is about 400 to 500 parts by weight based on 100 parts by weight of the base resin, the horizontal thermal conductivity of the horizontal thermal conductive sheet is high and at the same time excellent in formability.

The base resin is composed of at least one non-halogen-based elastic body, and the non-halogen-based elastic body constituting the base resin is not limited as long as it is a non-halogen-based elastic body having a hardness of 50 to 95 Shore A according to ASTM D-2240. Specific examples of non-halogen-based elastomers satisfying the above characteristics include acrylate rubber, NB rubber, NBR, urethane rubber, and ethylene-octene rubber. , EOR), ethylene-propylene rubber, ethylene-propylene-diene rubber (EPDM rubber), and polyethylene rubber (polyethylene rubber), and these materials are excellent in heat resistance, impact resistance, and adhesion. If the hardness of the base resin is 50 ~ 95 Shore A, the horizontal thermal conductive sheet has a commercially satisfactory wear resistance.

The kneaded material forming the horizontal thermal conductive layer preferably further comprises a lubricant. Lubricants aid in flow by lubricating metal surfaces in contact with plastics during calendering, forming and extrusion, making the surfaces even. That is, it prevents the adhesion between the mold surface or the extruder surface and the resin and is kneaded with the resin as an additive for improving the slip property, thereby lowering the melt viscosity to improve molding processability. The lubricant is not limited in kind as long as it is a material that can reduce the friction between the surface of the roller and the kneaded material in the calendering process described later and promote the sliding, and specifically, metal salts of stearic acid and fatty acids (usually, the metal components are calcium and zinc). ), Synthetic waxes in the form of esters and amides, paraffin waxes, mineral oils, low molecular weight polyethylene and the like. The amount of the lubricant is preferably about 1 to 3 parts by weight based on 100 parts by weight of the base resin. If the amount of the lubricant is less than 1 part by weight, the inherent function exerted by the lubricant is insufficient. This is because the function synergistic effect is not large.

Thermal conductivity Adhesive layer  Or electrical Insulation layer

The horizontal thermally conductive sheet according to the present invention may optionally further comprise an adhesive layer, preferably a thermally conductive adhesive layer 20. The thermally conductive adhesive layer is for adhering the horizontal thermal conductive sheet to the heat generating portion of the electronic device to increase the thermal conductivity between the heat generating portion and the horizontal thermal conductive sheet, and is formed by being laminated on one surface of the horizontal thermal conductive layer as shown in FIG. 1. In addition, although not shown in FIG. 1, it may be formed by being stacked on both sides of the horizontal thermal conductive layer. When the thermally conductive adhesive layer is formed on both sides of the horizontal thermal conductive layer, the thermally conductive adhesive layer on one side is closely adhered to the heat generating portion of the electronic device, and the thermally conductive adhesive layer on the other side is intimately connected with an active heat spreader such as a thin film heat pipe. Can be bonded.

The thermally conductive adhesive layer may be formed by a thermally conductive double-sided tape, wherein the thermally conductive double-sided tape is a thermally conductive adhesive applied to both sides of the tape, and the thermally conductive adhesive is made of a silicone pressure sensitive adhesive, an acrylic pressure sensitive adhesive, and an epoxy pressure sensitive adhesive. At least one thermally conductive filler selected from the group consisting of alumina powder, boron nitride (BN) powder, nickel powder, copper powder, and silver powder is filled in one of the pressure-sensitive adhesives selected from the group. In addition, the thermally conductive double-sided tape is any one of a pressure-sensitive adhesive selected from the group consisting of a silicone pressure sensitive adhesive, an acrylic pressure sensitive adhesive, and an epoxy pressure sensitive adhesive on both sides of a thermally conductive foil substrate made of aluminum, copper, nickel, or a combination thereof. It may be formed by applying.

In addition, although not shown in FIG. 1, the horizontal thermal conductive sheet according to the present invention may further include an electrical insulation layer formed by being stacked on one surface of the horizontal thermal conductive layer. The electrical insulation layer is formed by attaching an insulating tape such as a polyester film (PET film) or a polyimide film (PI film) to one surface of the horizontal thermal conductive layer, and the electrical insulating layer is electrically connected to the surface of the horizontal thermal conductive sheet and the electronic component. It serves to prevent the short circuit (short circuit), and also to increase the thermal conductivity in the horizontal direction rather than the vertical direction of the horizontal thermal conductive sheet.

Another aspect of the present invention is a method for producing a non-halogen-based horizontal thermal conductive sheet, in particular, a non-halogen-based horizontal roll-type non-halogen-based, having a high horizontal thermal conductivity, including a high content of graphite particles, does not contain a halogen-based resin It relates to a method for producing a thermally conductive sheet.

Figure 2 shows the manufacturing process of the non-halogen-based horizontal thermal conductive sheet shown in Figure 1 of the present invention.

Method for producing a non-halogen-based horizontal thermal conductive sheet according to the present invention (a) 100 parts by weight of base resin and flake graphite (A) consisting of at least one non-halogen-based elastomer having a hardness of 50 ~ 95 Shore A according to ASTM D-2240 method ( Flake Graphite) 300 to 500 parts by weight of particles in a pressure dispersion kneader and kneading at 100 ~ 140 ℃ to form a kneaded material; And (b) forming the kneaded material with a calender having a roller surface temperature of 50 ° C. to 80 ° C. to form a horizontal heat conductive layer. In addition, the method for producing a non-halogen-based horizontal thermal conductive sheet according to the present invention preferably comprises the steps of (c) attaching a thermally conductive double-sided tape to one or both sides of the horizontal thermal conductive layer to form a thermally conductive adhesive layer; can do. In addition, the method of manufacturing a non-halogen-based horizontal thermal conductive sheet according to the present invention is not shown in Figure 2, preferably (d) forming an electrical insulating layer by adhering an electrical insulating tape on one surface of the horizontal thermal conductive layer; It may further include.

With base resin Flotation  Containing graphite particles Kneading  Forming step ( S1 )

The step of forming a kneaded product including the base resin and the flake graphite particles is measured by weighing 100 parts by weight of the base resin consisting of at least one non-halogen-based elastomer having a hardness of 50 to 95 Shore A according to ASTM D-2240, and flake graphite (Flake Graphite) consists of weighing 300 to 500 parts by weight of particles and then kneading them. Kneading (or kneading) is an operation of mixing a highly viscous material or semi-plastic material, in which evenly crushed graphite particles are evenly added to a base resin made by applying mechanical shear force to have a constant acceleration. It is the work of mixing. In this case, mixing means not only having the flake graphite particles fed into the base resin, but also means that the flake graphite particles are sufficiently dispersed in the base resin. Kneading takes place at a temperature of about 100 to 140 ° C, preferably at about 130 ° C.

In addition, the step of forming the kneaded material is preferably characterized in that 1 to 3 parts by weight of the lubricant is further added to the pressure dispersion kneader and kneaded in the base resin to form a kneaded product.

Kneading  Horizontally molded into a calendar Thermal conductive layer  Forming step ( S2 )

The method for producing a non-halogen-based horizontal thermal conductive sheet according to the present invention is characterized by using a calendering method instead of a casting method in the step of forming a kneaded material to form a horizontal thermal conductive layer. The calendering method is a method in which a hollow roller made of two to four cast irons is stacked and rolled while passing a kneaded material therebetween to make a sheet. When kneaded material passes between rollers, The pressurization between the rollers and the heat of the steam sent from them is applied. When using the calendering method, the highly viscous kneaded material can be easily formed into a sheet, and the kneaded material may contain much higher content of flaky graphite particles than the base resin, and the final molded sheet is smooth and uniform. It has a surface. At this time, it is preferable that the roller surface temperature of the calender is 50-80 ° C, but if the roller surface temperature of the calender is less than 50 ° C, the base resin does not soften, making the surface of the sheet uneven and making it difficult to manufacture a sheet having a thickness of 2 mm or less, The mechanical properties of the sheet are also poor. In addition, when the roller surface temperature of the calender exceeds 80 ℃, the softening of the base resin is active and the sheet sticks to the roll surface, the tension is weakened when the sheet is manufactured in the roll type, the sheet is cut and thus the winding ( Winding) becomes difficult and ultimately makes it difficult to manufacture the sheet into a roll type.

level Thermal conductive layer  On one side or both sides Thermal conductivity Adhesive layer  Forming step ( S3 )

The horizontal thermal conductive sheet according to the present invention may be made of only a horizontal thermal conductive layer, but preferably further includes a thermally conductive adhesive layer formed on one or both sides of the horizontal thermal conductive layer. The method of forming the thermally conductive adhesive layer includes a method of directly applying a thermally conductive adhesive to one surface of the horizontal thermally conductive layer. Preferably, there is a method of attaching a thermally conductive double-sided tape to one or both surfaces of the horizontal thermally conductive layer.

The thermally conductive double-coated tape is formed by applying a thermally conductive adhesive on both sides of the tape, wherein the thermally conductive adhesive is alumina powder or boron nitride in any one selected from the group consisting of silicone pressure sensitive adhesives, acrylic pressure sensitive adhesives, and epoxy pressure sensitive adhesives. , BN) powder, nickel powder, copper powder, and one or more thermally conductive fillers selected from the group consisting of silver powder. In addition, the thermally conductive double-coated tape is formed by applying any one selected from the group consisting of silicone pressure sensitive adhesive, acrylic pressure sensitive adhesive, and epoxy pressure sensitive adhesive on both sides of a thermally conductive foil substrate made of aluminum, copper, nickel or a combination thereof. It may be.

On the other hand, the horizontal heat conductive sheet according to the present invention preferably has a thickness of 0.02 to 2.0 mm, the thickness of the horizontal heat conductive sheet can be controlled by appropriately adjusting the distance between the rollers of the calendar.

The roll-type non-halogen-based horizontal thermal conductive sheet manufactured by the above manufacturing method may be cut to a suitable size and used to solve thermal management problems of various electronic devices.

Hereinafter, the present invention will be described more clearly through specific examples. However, the protection scope of the present invention is not limited by the following examples.

Example  One.

100 parts by weight of ethylene-propylene rubber having a density of 0.870 g / cm 3 and a hardness of 85 Shore A according to ASTM D-2240, crystalline flat graphite having a density of 2.2 g / cm 3 and an average particle diameter of 5 μm. (Crystalline flake graphite, Superior Graphite Co., Ltd.) 300 parts by weight of particles, 2 parts by weight of stearic acid (Stearic acid) as a lubricant was added to a pressure dispersion kneader and kneaded at 130 ° C. for 2 hours to prepare a kneaded product. The kneaded material was charged into a calender having a surface temperature of 60 ° C. and roll molded to prepare a roll type horizontal thermal conductive sheet of about 0.1 mm. The horizontal thermal conductivity of the prepared horizontal thermal conductive sheet was measured using a thermal conductivity tester (model name: LFA-447, manufacturer: NETZSCH) and the result was 23 W / m · K.

Example  2.

100 parts by weight of ethylene propylene diene rubber (EPDM) having a density of 0.93 g / cm 3 and a hardness of 50 Shore A according to ASTM D-2240, a crystalline phase having a density of 2.2 g / cm 3 and an average particle diameter of 5 μm. 400 parts by weight of graphite (Crystalline flake graphite, Superior Graphite Co., Ltd.) particles, 3 parts by weight of stearic acid (Stearic acid) as a lubricant was added to a pressure dispersion kneader and kneaded at 120 ℃ for 2 hours to prepare a kneaded product. The kneaded material was charged into a calender having a surface temperature of 70 ° C. and roll molded to prepare a roll type horizontal thermal conductive sheet of about 0.1 mm. The horizontal thermal conductivity of the manufactured horizontal thermal conductive sheet was 24 W / mK.

Example  3.

A roll type horizontal thermal conductive sheet was prepared under the same conditions as in Example 1 except that 600 parts by weight of crystalline flaky graphite particles and 3 parts by weight of stearic acid were used as lubricants. The horizontal thermal conductivity of the manufactured horizontal thermal conductive sheet was 25 W / m * K.

Comparative example  One.

A roll type horizontal thermal conductive sheet was prepared under the same conditions as in Example 1 except that 200 parts by weight of crystalline flaky graphite particles were used in the preparation of the kneaded material. The horizontal thermal conductivity of the manufactured horizontal thermal conductive sheet was 8 W / m * K.

Comparative example  2.

100 parts by weight of ethylene-propylene rubber having a density of 0.870 g / cm 3 and a hardness of 85 Shore A according to ASTM D-2240, crystalline flat graphite having a density of 2.2 g / cm 3 and an average particle diameter of 5 μm. (Crystalline flake graphite, Superior Graphite, USA) 700 parts by weight of particles, 2 parts by weight of stearic acid (Stearic acid) as a lubricant was added to a pressure dispersion kneader and kneaded at 130 ° C for 2 hours to prepare a kneaded product. In the prepared kneaded material, the lumped graphite particles were not uniformly dispersed in the base resin, but agglomeration of the flake graphite particles occurred. The kneaded material was charged into a calender having a surface temperature of 60 ° C. and roll formed. Cracking occurred in the sheet during molding by calendering, and the sheet was cut when winding in a roll type, and the surface of the sheet was not smooth and rough.

Comparative example  3.

A kneaded product was prepared under the same conditions and method as in Example 1. The prepared kneaded product was cast on a PET substrate film using a comma coater. The clay of the kneaded product was too high to be coated on the substrate film with a uniform thickness during the casting process, and cracks occurred when the applied kneaded material was dried. .

10: horizontal thermal conductive layer 20: thermal conductive adhesive layer

Claims (10)

100 parts by weight of a base resin consisting of at least one non-halogen-based elastomer having a hardness of 50 to 95 Shore A according to ASTM D-2240, and 300 to 600 parts by weight of flaky graphite particles kneaded and dispersed in the base resin. A roll type non-halogen type horizontal heat conductive sheet provided with the horizontal heat conductive layer shape | molded by the kneaded material containing.
The roll-type non-halogen-based horizontal thermal conductive sheet according to claim 1, wherein the kneaded product further includes 1-3 parts by weight of a lubricant kneaded and dispersed in a base resin.
According to claim 1, The non-halogen-based elastomer is an acrylate rubber (Acrylate Rubber), NB rubber (Acrylonitrile Butadiene Rubber, NBR), urethane rubber, ethylene- octene rubber (Ethylene-Octene Rubber, EOR), ethylene-propylene rubber (Ethylene-Propylene Rubber), ethylene-propylene-diene rubber (EPDM Rubber) and a non-halogen-based horizontal thermal conductive sheet of the roll type, characterized in that any one selected from the group consisting of polyethylene rubber.
The non-halogen-based horizontal thermal conductive sheet according to any one of claims 1 to 3, further comprising an adhesive layer laminated on one or both surfaces of the horizontal thermal conductive layer.
The non-halogen-based horizontal thermal conductive sheet according to any one of claims 1 to 3, further comprising an electrical insulating layer laminated on one surface of the horizontal thermal conductive layer.
(a) 100 parts by weight of the base resin consisting of at least one non-halogen-based elastomer having a hardness of 50 to 95 Shore A and 300 to 500 parts by weight of flaky graphite particles in accordance with ASTM D-2240. And kneading at 100 ~ 140 ℃ to form a kneaded material; And
(b) forming the kneaded material with a calender having a roller surface temperature of 50 ° C. to 80 ° C. to form a horizontal heat conductive layer.
The method of claim 6, wherein the step (a) further comprises adding 1 to 3 parts by weight of the lubricant to the pressure dispersion kneader and kneading to form a kneaded material.
According to claim 6, The non-halogen-based elastomer is an acrylate rubber (Acrylate Rubber), NB rubber (Acrylonitrile Butadiene Rubber, NBR), urethane rubber, ethylene- octene rubber (Ethylene-Octene Rubber, EOR), ethylene-propylene rubber (Ethylene-Propylene Rubber), ethylene-propylene-diene rubber (EPDM Rubber) and a method for producing a non-halogen-based horizontal thermal conductive sheet of the roll type, characterized in that any one selected from the group consisting of polyethylene rubber.
The method according to any one of claims 6 to 8,
(c) attaching a thermally conductive double-sided tape to one or both sides of the horizontal thermally conductive layer to form a thermally conductive adhesive layer;
The thermally conductive double-coated tape is formed by applying a thermally conductive adhesive on both sides of the tape, and the thermally conductive adhesive is alumina powder or boron nitride in any one selected from the group consisting of silicone pressure sensitive adhesives, acrylic pressure sensitive adhesives, and epoxy pressure sensitive adhesives. Nitride, BN) powder, nickel powder, copper powder, and is formed by filling the at least one thermally conductive filler selected from the group consisting of silver powder, or
The thermally conductive double-coated tape is formed by applying any one selected from the group consisting of silicone pressure sensitive adhesives, acrylic pressure sensitive adhesives, and epoxy pressure sensitive adhesives on both sides of a thermally conductive foil substrate made of aluminum, copper, nickel, or a combination thereof. A method for producing a non-halogen-based horizontal thermally conductive sheet of a roll type.
The method according to any one of claims 6 to 8,
(d) adhering an electrical insulating tape to one surface of the horizontal thermal conductive layer to form an electrical insulating layer; a method of manufacturing a roll-type non-halogen-based horizontal thermal conductive sheet further comprising a.

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