JP7093902B1 - Directional heat conduction sheet and its manufacturing method, and semiconductor heat dissipation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a directional heat conductive sheet having high directional, high heat conductivity and uniformity. SOLUTION: The fluid composition obtained in step S1 for preparing a fluid composition for a heat conductive sheet is placed in an alignment molding apparatus, and a high-speed shearing force that makes a circular motion for each layer is applied to the fluid composition. The heat conductive filler in the fluid composition is oriented along the shear direction to form an oriented thin layer composition, and the thin layer composition is collected layer by layer in a mold to form a continuous multi-layer aggregate. Step S2 to heat-cure the multilayer aggregate to obtain an alignment composition block, and step S4 to slice the alignment composition block along the direction perpendicular to the orientation to obtain a directional heat conductive sheet. including. The aggregate produced by the method of the present invention has high orientation, few defects, high efficiency, and the thermally conductive sheet obtained by slicing has high directivity, high thermal conductivity and uniformity, and also. , The heat conductive sheet can be suitably applied to a semiconductor heat dissipation device. [Selection diagram] Fig. 1

Description

The present invention relates to a heat conductive sheet manufacturing technique and a semiconductor heat dissipation field, and specifically to a directional heat conductive sheet manufacturing method and a semiconductor heat dissipation device.

With the development of 5G technology, the power density of chips is constantly increasing, and the demand for heat dissipation of chips is higher. In the heat dissipation module, a heat conductive silicone rubber spacer is generally used to reduce the interfacial thermal resistance between the chip and the heatsink and improve the heat dissipation efficiency.

Currently, ordinary heat conductive silicone rubber spacers are realized by filling an isotropic spherical heat conductive filler (aluminum oxide, aluminum nitride, zinc oxide, etc.) in a silicone rubber matrix, which is unique to spherical ceramic fillers. Due to its low thermal conductivity, it is generally difficult for the spacer to exceed 10 W / m · k.

Among the anisotropic heat conductive fillers, the fibrous or sheet-shaped heat conductive filler often has high heat conductivity in the longitudinal direction of the fiber or the in-plane direction of the sheet, for example, the shaft of the mesophase pitch carbon fiber. The directional thermal conductivity can reach 900 W / m · k and the in-plane thermal conductivity of the hexagonal boron nitride microsheet can reach 400 W / m · k. Therefore, using an anisotropic heat conductive filler and orienting the spacer along the thickness direction is one of the effective methods for producing a high heat conductive silicone rubber spacer.

In the patents already disclosed, it is common to orient the anisotropic filler using a magnetic field method, an extrusion method and a fluid shear method. Patent CN15048099C is disclosed by Polymatec Co., Ltd., and aluminum oxide is added by orienting highly filled carbon fibers along the magnetic field direction in a high-viscosity composition by applying vibration of a constant frequency using a superconducting magnetic field. And the density of the carbon fiber filler is 3 to 8 times and 2 times the density of the silicone resin matrix, respectively, so when vibration is applied, the filler will settle, causing non-uniformity in the entire composition, and finally heat. Affects the uniformity of conduction properties. In addition, the price and operating cost of superconducting magnets are high, which increases the cost. Also, CN107004651A, CN108463882A and CN109891577A were disclosed by Dexerials Co., Ltd., in which carbon fibers were oriented along the extrusion direction by an extrusion method and, according to tests, filled to produce a highly thermally conductive sheet. When the mass ratio of the carbon fiber to the resin is larger than 1.3, the viscosity of the composition is high, the fluidity is low, and extrusion processing is difficult. Further, when molding in a hollow mold, the fluidity is low and gaps are likely to be generated between adjacent extruders, so that the extrusion method is not suitable for the orientation of highly filled compositions. The patent CN110734562A, which has already been disclosed, makes a circular motion using an annular groove to orient the fibers in the composition in the groove along the direction of rotation. It is limited by the size of the annular groove, so that the width of the thermally conductive sheet obtained by slicing the annular cured product along the radial direction is also limited by the width of the annular groove, and a wide thermal conductive sheet cannot be obtained. In addition, when the width of the annular groove is increased, only the composition close to both sides of the annular groove wall is oriented, and the inside of the composition cannot receive the frictional force with the groove wall, so that the viscosity is particularly high. In the above composition, there are two drawbacks that the orientation of the composition becomes insufficient, and finally a heat conductive sheet having high orientation and high heat conductivity cannot be obtained.

In response to the problems existing in the prior art, the present invention relates to a high-speed shear alignment and continuous molding apparatus, and the manufactured directional heat conductive sheet is a directional heat conductive sheet having high orientation, high heat conductivity and uniformity. The purpose is to provide a manufacturing method.

Another object of the present invention is to provide a directional heat conductive sheet.

Another object of the present invention is to provide a semiconductor heat dissipation device.

The specific solutions are as follows.
The manufacturing method of the directional heat conductive sheet is
Step S1 to prepare a fluid composition for a heat conductive sheet,
In the alignment molding, the fluid composition obtained in step S1 is placed in the alignment molding apparatus, a high-speed shearing force that makes a circular motion for each layer is applied to the fluid composition, and a heat conductive filler in the fluid composition is applied. To form an oriented thin-layer composition, and the thin-layer composition is collected in a mold layer by layer to form a continuous multi-layer aggregate.
In step S3, which is curing, the multilayer aggregate obtained in step S2 is thermally cured to obtain an orientation composition block.
It is a slice, and is characterized by including a step S4 in which the orientation composition block obtained in step S3 is sliced along a direction perpendicular to the orientation to obtain a directional heat conductive sheet. Further, step S1 is specifically to form a fluid composition having a constant viscosity after stirring and defoaming the additive type silicone oil and the heat conductive filler, and the viscosity of the fluid composition is 200,000 to 3,000,000. It is preferably mPa · s. The additive-type silicone oil is obtained by subjecting a vinyl silicone oil and a hydrogen-containing silicone oil to an addition reaction (heating) by the action of a catalyst to obtain a silicone rubber. The additive-type silicone oil is a vinyl silicone oil and a hydrogen-containing silicone oil. It is preferably a mixture of silicon and a platinum catalyst.

Further, in step S1, the heat conductive filler contains two types of heat conductive fillers, one is a fibrous high heat conductive filler and / or a sheet high heat conductive filler, and the other is a spherical heat conductive filler. The present invention adds a spherical heat transfer filler to make contact between adjacent high heat transfer fillers to enrich the heat transfer network.

Further, the fibrous high thermal conductive filler is a carbon fiber, a carbon nanotube fiber or a graphene fiber, the sheet-shaped high thermal conductive filler is a hexagonal boron nitride microsheet or a graphite microsheet, and the spherical thermal conductive filler is aluminum oxide. One or more of aluminum nitride and silicon carbide.

Further, in step S1, the mass ratio of the fibrous or sheet-like high thermal conductive filler to the silicone oil is 0.5 to 2.5, and the spherical thermal conductive filler occupies 50 to 80% of the total mass of the composition.

Further, in step S2, the alignment forming apparatus drives the fluid composition so as to make a circular motion, and in the process of the circular motion, a high-speed shearing force is applied to the fluid composition along the circumference for each layer to form the fluid composition. The heat conductive filler in the object is oriented along the shear direction to form an oriented thin layer composition.

Further, in step S2, the present invention uses an alignment molding apparatus, and the alignment molding apparatus is used.
In a cylindrical drum, a rotating shaft is fixedly provided on the central axis of the drum, one end of the rotating shaft is a first motor, and the first motor drives the rotation of the drum by the rotating shaft. A cylindrical drum having a material filling area provided on the drum and a drum opening provided on the side surface of the bottom of the drum in the material filling area.
A sleeve in which the sleeve is fitted outside the drum, the drum can rotate inside the sleeve, and a sleeve opening corresponding to the size of the drum opening is provided on the side surface of the sleeve facing the drum opening. When,
The mold is provided with an internal cavity and an internal cavity opening in the mold, and the edge of the internal cavity opening is flush with and closely provided with the edge of the drum opening in a direction perpendicular to the central axis of the drum. The edge of the internal cavity opening extends inward along the horizontal direction to form the side wall of the internal cavity, and the piston and the second motor are in close contact with the wall of the internal cavity in the mold. The second motor is provided so as to drive the piston away from the sleeve opening direction, and the starting position of the piston is a mold flush with the sleeve opening.
Includes an electric heating module provided to heat the internal cavity of the mold.

Further, there is a gap between the drum and the sleeve, and the pitch of the gap is 0.1 to 5 mm.

Further, it is preferable that the material filling region is provided symmetrically along the central axis of the drum, and the material filling region is two fan-shaped cylindrical regions provided symmetrically with respect to the central axis of the drum.

Further, the piston of the present invention is intermittently separated from the sleeve opening by the drive of the motor, preferably the intermittent interval time is t (min), and t ≧ π / ω and ω are the angular velocities of the drum (r). / Min).

Further, preferably, in the present invention, the speed at which the piston separates from the sleeve opening each time is v (mm / min), and v ≦ D · ω / 2, D (mm) is the distance between the drum and the sleeve. And ω is the angular velocity (r / min) of the drum.

Further, an intermediate layer is provided in the sleeve, and the cooling medium is filled in the intermediate layer. Preferably, the cooling medium is water.

The present invention further discloses a directional heat conductive sheet manufactured by the above-mentioned method for manufacturing a directional heat conductive sheet.

The present invention includes a directional heat conductive sheet manufactured by the method for manufacturing a directional heat conductive sheet, and the semiconductor heat radiating device in which the directional heat conductive sheet is sandwiched between a packaged chip and a radiator. Will be further disclosed.

Further, the radiator is a fin radiator or a vapor chamber.

Compared with the prior art, the beneficial effects of the present invention are as follows.
The present invention creatively uses a continuous thin-layer fluid shear orientation method, which combines high-speed shear orientation with a continuous forming apparatus and uses high-speed shear alignment technology to form fibrous or fibrous in each thin-layer composition. The sheet-like high thermal conductivity filler can be effectively oriented to be sufficiently oriented, the composition to be applied has a wide range of viscosity, and each thin layer composition sufficiently oriented using a continuous forming apparatus is dense. The aggregate is made to be an aggregate, so that the aggregate produced by the method has high orientation, few defects, high efficiency, and the heat conductive sheet obtained by the slicing process has high orientation, high heat conductivity and uniformness. Moreover, the heat conductive sheet can be suitably applied to a semiconductor heat dissipation device.

The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and exemplary examples and explanations thereof of the present invention are used to explain the present invention, and the present invention is not used. It is not an appropriate limitation.
It is sectional drawing of the cross section of the alignment molding apparatus in Example 1. FIG. It is a plan view of the alignment molding apparatus in Example 1. FIG. It is a schematic diagram of the aggregate after being oriented by using the alignment molding apparatus in Example 1 in the manufacturing process of the directional heat conductive sheet. It is a schematic diagram of the directional heat conductive sheet obtained after curing and slicing an aggregate by using the orientation forming apparatus in Example 1 in the manufacturing process of a directional heat conductive sheet. It is an electron micrograph of the directional heat conduction sheet obtained in Example 2 (FIG. A is a cross-sectional scanning electron micrograph of the directional heat conduction sheet, and FIG. B is a partially magnified scanning electron of a designated portion in FIG. A. It is a micrograph). It is sectional drawing of the semiconductor heat radiating apparatus which concerns on Example 7. FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings, and the description of this part is merely exemplary and descriptive, and does not limit the scope of protection of the present invention. Further, one of ordinary skill in the art can appropriately combine the features of the examples of the present specification and various embodiments based on the description of the present specification.

Example 1
The present embodiment provides an alignment molding apparatus, which includes a cylindrical drum 2, a sleeve 3, a mold 9, and an electric heating module 13, as shown in FIGS. 1 and 2.

A rotary shaft 5 is fixedly provided on the central axis of the drum 2, one end of the rotary shaft 5 is a first motor 6, and the first motor 6 drives the rotation of the drum 2 by the rotary shaft 5. The drum 2 is provided with an axially symmetric material filling region 1, the material filling region 1 is two fan-shaped cylindrical regions, and the two fan-shaped cylindrical regions are provided symmetrically with respect to the central axis of the drum. A drum opening is provided on the bottom side surface of the drum 2 in the material filling region 1.

An intermediate layer is provided in the sleeve 3, and the cooling medium 4 is filled in the intermediate layer. The sleeve 3 is fitted outside the drum 2, and in this embodiment, a gap 14 is provided between the drum 2 and the sleeve 3, and the pitch of the gap 14 is 0.1 to 5 mm. The drum 2 can rotate inside the sleeve 3, and a sleeve opening corresponding to the size of the drum opening is provided on the side surface of the sleeve 3 facing the drum opening.

The mold 9 is provided with an internal cavity and an internal cavity opening, and the edge of the internal cavity opening is flush with and closely provided with the edge of the drum opening, and the direction perpendicular to the central axis of the drum 2 is the horizontal direction. The edge of the internal cavity opening extends inward along the horizontal direction to form a side wall of the internal cavity, and the piston 12 and the second motor 11 are closely provided on the wall of the internal cavity in the mold 9. The output end of the second motor 11 is a bolt 10, the bolt is connected to the piston 12, and the second motor 11 drives the piston 12 by the bolt 10 so as to be separated from the sleeve opening direction. However, the starting position of the piston 12 is flush with the sleeve opening, and during the operation of the alignment molding apparatus of the present embodiment, the piston is intermittently separated from the sleeve opening by the drive of the motor, and the intermittent interval time thereof. Is t (min), and t ≧ π / ω and ω are the angular velocities of the drum (r / min), and the speed away from the sleeve opening is v (mm / min) each time, and v ≦ D · ω / 2. Is satisfied, D (mm) is the pitch between the drum and the sleeve, and ω is the angular velocity (r / min) of the drum.

The electric heating module 13 is provided so as to heat the internal cavity of the mold 9.

Specifically, when manufacturing a directional heat conductive sheet using the orientation molding apparatus of this embodiment, specific operation steps are as follows.
The prepared fluid composition is placed in a symmetrical material container region 1 in the drum 2 of the alignment forming apparatus, and the angular velocity of the drum 2 is set to ω to cause a circular motion, and a sleeve is fixedly arranged. The intermediate layer in 3 is filled with the circulating cooling medium 4, and in the process of circular motion, the fluid composition in the material filling region 1 is subjected to the action of centrifugal force to the drum 2 and the sleeve from the drum opening on the bottom side surface of the drum 2. It enters the gap 14 with 3 and is specifically as shown in FIG. 2. In the gap 14, the fluid composition is sheared at high speed to form a thin layer composition 7 in which carbon fibers are oriented along the shearing direction. Then, the interval time at which the piston 12 leaves the sleeve opening is set to t, and the speed at which the piston 12 leaves the sleeve opening is set to v each time. In this case, as shown in FIG. 3, the thin layer composition 7 is layered via the internal cavity opening. Each unit is assembled in the internal cavity of the mold 9 to form a continuous multilayer aggregate 8, and in this embodiment, the fluid composition is composed of a fibrous or sheet-like high thermal conductive filler 15 and a spherical thermal conductive filler 16. , A silicone rubber matrix 17, and referring to the multilayer aggregate 8 shown in FIGS. 2 and 3, the fibrous or sheet-like high heat conductive filler 15, the spherical heat conductive filler 16, and the silicone rubber matrix 17 are directed in the shearing force direction. After forming the multilayer assembly 8, the electric heating module 13 was turned on, and the mold 9 was electrically heated until the appropriate temperature and time were reached. Then, the multilayer aggregate 8 inside the mold 9 is thermally cured to obtain an alignment composition block, followed by a slicing process, and as shown in FIG. 4, the alignment composition is prepared using an ultrasonic cutting blade 18. The blocks are stepped and sliced along the thickness direction and each stepping increment is set to obtain a directional heat transfer sheet 19 of a particular thickness.

Example 2
The present embodiment provides a method for manufacturing a directional heat conductive sheet, the orientation molding apparatus in the first embodiment is used, and specific implementation steps are the following S1 to S5.

S1, in the formulation, 100 g of add-on silicone oil (a mixture of 55 g of vinyl silicone oil, 44.9 g of hydrogen-containing silicone oil, and 0.1 g of platinum catalyst) and 75 g of carbon fiber powder (length 0.1 mm, diameter 15 μm). And 300 g of spherical aluminum oxide are mixed and stirred for 30 minutes and vacuum defoamed for 5 minutes to form a fluid composition having a viscosity of 200,000 mPa · s.

S2, In the alignment molding, the fluid composition obtained in step S1 is placed in a symmetrical material filling region in the drum of the alignment molding apparatus, and the angular velocity of the drum is set to 70 r / min to cause a circular motion. In the process of circular motion, the composition is affected by centrifugal force and enters the gap between the drum and the sleeve through the opening at the bottom of the drum, the distance between the drum and the sleeve is set to 0.1 mm, and the circulating cooling water is applied to the sleeve. To form a thin layer composition in which the carbon fibers are oriented along the shear direction by high-speed shearing of the composition, the interval at which the piston separates from the sleeve is 3 s, and the speed at which the piston separates from the sleeve is 3 mm / min each time. The thin layer composition is set and collected layer by layer in a mold to form a continuous multi-layer aggregate.

In S3 and curing, the mold in step S2 is heated to 120 ° C. and heated for 30 minutes to thermally cure the multilayer aggregate inside the mold to obtain an orientation composition block and remove it from the mold.

In S4, slicing, the alignment composition block obtained in step S3 is stepped and sliced along the thickness direction using an ultrasonic cutting blade, the stepping increment is set to 2 mm each time, and the thickness is 2 mm. Obtain a heat conductive sheet.

FIG. 5 is an electron micrograph of the directional heat conduction sheet obtained in the example. Here, FIG. A is a cross-sectional scanning electron micrograph of the directional heat conduction sheet, and FIG. B is a partially enlarged scanning electron micrograph of a designated portion in FIG. A, and the directional heat conduction obtained in this embodiment is shown. It can be seen that the carbon fibers in the sheet are sufficiently oriented.

Example 3
The present embodiment provides a method for manufacturing a directional heat conductive sheet, the orientation molding apparatus in the first embodiment is used, and specific implementation steps are the following S1 to S5.

S1, in the formulation, 100 g of reactive silicone oil (a mixture of 55 g of vinyl silicone oil, 44.9 g of hydrogen-containing silicone oil and 0.1 g of platinum catalyst) and 120 g of carbon fiber powder (length 0.1 mm, diameter 15 μm). , 300 g of spherical aluminum oxide and 50 g of spherical aluminum nitride are mixed and stirred for 30 min, and vacuum defoamed for 5 min to form a fluid composition having a viscosity of 650,000 mPa · s.

S2, In the alignment molding, the fluid composition obtained in step S1 is placed in a symmetrical material filling region in the drum of the alignment molding apparatus, and the angular velocity of the drum is set to 90 r / min to cause a circular motion. In the process of circular motion, the composition enters the gap between the drum and the sleeve through the opening at the bottom of the drum under the action of centrifugal force, the distance between the drum and the sleeve is set to 0.2 mm, and the circulating cooling water is applied to the sleeve. To form a thin layer composition in which the carbon fibers are oriented along the shearing direction by high-speed shearing the composition, the interval time for the piston to separate from the sleeve is 5 s, and the speed at which the piston separates from the sleeve is 4 mm / min each time. The thin layer composition is collected in a mold layer by layer to form a continuous multi-layer aggregate.

In S3 and curing, the mold in step S2 is heated to 120 ° C. and heated for 30 minutes to thermally cure the multilayer aggregate inside the mold to obtain an orientation composition block and remove it from the mold.

In S4, slicing, the alignment composition block obtained in step S3 is stepped and sliced along the thickness direction using an ultrasonic cutting blade, the stepping increment is set to 2 mm each time, and the thickness is 2 mm. Obtain a heat conductive sheet.

Example 4
The present embodiment provides a method for manufacturing a directional heat conductive sheet, the orientation molding apparatus in the first embodiment is used, and specific implementation steps are the following S1 to S5.

S1, in the formulation, 100 g of reactive silicone oil (a mixture of 55 g of vinyl silicone oil, 44.9 g of hydrogen-containing silicone oil and 0.1 g of platinum catalyst), 85 g of boron nitride microsheet, 350 g of spherical aluminum oxide, and spherical carbonization. After mixing and stirring 50 g of silicon for 30 min and vacuum defoaming for 5 min, a fluid composition having a viscosity of 1 million mPa · s is formed.

S2, In the alignment molding, the fluid composition obtained in step S1 is placed in a symmetrical material filling region in the drum of the alignment molding apparatus, and the angular velocity of the drum is set to 90 r / min to cause a circular motion. In the process of circular motion, the composition is affected by centrifugal force and enters the gap between the drum and the sleeve through the opening at the bottom of the drum, the distance between the drum and the sleeve is set to 1 mm, and the sleeve is filled with circulating cooling water. The composition is sheared at high speed to form a thin layer composition in which boron nitride microsheets are oriented along the shearing direction, the interval time for the piston to separate from the sleeve is 5 s, and the speed at which the piston separates from the sleeve is 40 mm / min each time. The thin layer composition is set and collected layer by layer in a mold to form a continuous multi-layer aggregate.

In S3 and curing, the mold in step S2 is heated to 120 ° C. and heated for 30 minutes to thermally cure the multilayer aggregate inside the mold to obtain an orientation composition block and remove it from the mold.

In S4, slicing, the alignment composition block obtained in step S3 is stepped and sliced along the thickness direction using an ultrasonic cutting blade, the stepping increment is set to 2 mm each time, and the thickness is 2 mm. Obtain a heat conductive sheet.

Example 5
The present embodiment provides a method for manufacturing a directional heat conductive sheet, the orientation molding apparatus in the first embodiment is used, and specific implementation steps are the following S1 to S5.

S1, in the formulation, 100 g of reactive silicone oil (a mixture of 55 g of vinyl silicone oil, 44.9 g of hydrogen-containing silicone oil and 0.1 g of platinum catalyst) and 150 g of carbon fiber powder (length 0.1 mm, diameter 15 μm). , 400 g of spherical aluminum oxide is mixed and stirred for 30 minutes, and after 5 min vacuum defoaming, a fluid composition having a viscosity of 2 million mPa · s is formed.

S2, In the alignment molding, the fluid composition obtained in step S1 is placed in a symmetrical material filling region in the drum of the alignment molding apparatus, and the angular velocity of the drum is set to 150 r / min to cause a circular motion. In the process of circular motion, the composition is affected by centrifugal force and enters the gap between the drum and the sleeve through the opening at the bottom of the drum, the distance between the drum and the sleeve is set to 2 mm, and the sleeve is filled with circulating cooling water. , The composition is sheared at high speed to form a thin layer composition in which carbon fibers are oriented along the shear direction, and the interval time at which the piston separates from the sleeve is set to 2 s, and the speed at which the piston separates from the sleeve is set to 140 mm / min each time. , The thin layer composition is collected layer by layer in a mold to form a continuous multi-layer aggregate.

In S3 and curing, the mold in step S2 is heated to 120 ° C. and heated for 30 minutes to thermally cure the multilayer aggregate inside the mold to obtain an orientation composition block and remove it from the mold.

In S4, slicing, the alignment composition block obtained in step S3 is stepped and sliced along the thickness direction using an ultrasonic cutting blade, the stepping increment is set to 2 mm each time, and the thickness is 2 mm. Obtain a heat conductive sheet.

Example 6 Characteristic measurement test In this example, heat conduction characteristics are measured for the directional heat conduction sheet manufactured in Example 2-5. The method for measuring the heat conduction characteristics is the heat stable state method, the measurement standard is ASTM D5470, and the step is to cut a heat conduction spacer with a thickness of 2 mm into 26 * 26 mm square pieces, and LW-9389 from Long Win. Place it in a thermal conductivity measuring device, set the pressure to 10 psi, and measure the thermal conductivity. The results are shown in the table below.

As can be seen from the above, the directional heat conductive sheet produced by the method of the present invention has high heat conductivity.

Example 7
The present embodiment provides a semiconductor heat dissipation device to which the directional heat conductive sheet obtained in Examples 2 to 5 is applied, and in the semiconductor heat radiating device described in this embodiment, the directional heat conductive sheet 19 is packaged with the radiator 20. The semiconductor heat radiating device is provided on the packaged chip 21 of the circuit board 23, and the semiconductor heat radiating device is provided on the chip 21 as shown in FIG. A directional heat conductive sheet 19 provided and a radiator 20 provided on the directional heat conductive sheet 19 are included, and a pin 22 is provided on the side surface of the packaged chip 21.

It should be pointed out that the above are merely preferred embodiments of the present invention, and that those skilled in the art can make some improvements and modifications without departing from the principles of the present invention. Should also be considered as the scope of protection of the present invention.

1 ... Material filling area, 2 ... Drum, 3 ... Sleeve, 4 ... Cooling medium, 5 ... Rotating shaft, 6 ... First motor, 7 ... Oriented thin layer Composition, 8 ... aggregate, 9 ... mold, 10 ... volt, 11 ... second motor, 12 ... piston, 13 ... electric heating module, 14 ... Gap, 15 ... fibrous or sheet-like high heat conductive filler, 16 ... spherical heat conductive filler, 17 ... silicone rubber matrix, 18 ... ultrasonic cutting blade, 19 ... directional heat conductive sheet , 20 ... radiator, 21 ... packaged chip, 22 ... pins, 23 ... circuit board.

Claims (8)

Step S1 to prepare a fluid composition for a heat conductive sheet,
In the alignment molding, the fluid composition obtained in step S1 is placed in the alignment molding apparatus, a high-speed shearing force that makes a circular motion for each layer is applied to the fluid composition, and a heat conductive filler in the fluid composition is applied. To form an oriented thin-layer composition, and the thin-layer composition is collected in a mold layer by layer to form a continuous multi-layer aggregate.
In step S3, which is curing, the multilayer aggregate obtained in step S2 is thermally cured to obtain an orientation composition block.
A slice comprising the step S4, wherein the alignment composition block obtained in step S3 is sliced along a direction perpendicular to the orientation to obtain a directional heat conductive sheet.
The alignment molding apparatus is
In a cylindrical drum, a rotating shaft is fixedly provided on the central axis of the drum, one end of the rotating shaft is a first motor, and the first motor drives the rotation of the drum by the rotating shaft. A cylindrical drum having a material filling area provided on the drum and a drum opening provided on the side surface of the bottom of the drum in the material filling area.
A sleeve in which the sleeve is fitted outside the drum, the drum can rotate inside the sleeve, and a sleeve opening corresponding to the size of the drum opening is provided on the side surface of the sleeve facing the drum opening. When,
The mold is provided with an internal cavity and an internal cavity opening in the mold, and the edge of the internal cavity opening is flush with and closely provided with the edge of the drum opening in a direction perpendicular to the central axis of the drum. The edge of the internal cavity opening extends inward along the horizontal direction to form the side wall of the internal cavity, and the piston and the second motor are in close contact with the wall of the internal cavity in the mold. The second motor is provided so as to drive the piston away from the sleeve opening direction, and the starting position of the piston is a mold flush with the sleeve opening.
Includes an electric heating module, which is provided to heat the internal cavity of the mold.
There is a gap between the drum and the sleeve, and the pitch of the gap is 0.1 to 5 mm.
A method for manufacturing a directional heat conductive sheet, wherein the piston is intermittently separated from the sleeve opening by driving a motor. The directional heat conduction according to claim 1, wherein step S1 specifically forms a fluid composition having a constant viscosity after stirring and defoaming an add-on silicone oil and a heat conduction filler. How to make a sheet. In step S1, the heat conductive filler contains two types of heat conductive fillers, one is a fibrous high heat conductive filler and / or a sheet high heat conductive filler, and the other is a spherical heat conductive filler. The method for manufacturing a directional heat conductive sheet according to claim 2. The fibrous high thermal conductive filler is carbon fiber, carbon nanotube fiber or graphene fiber, the sheet high thermal conductive filler is hexagonal boron nitride microsheet or graphite microsheet, and the spherical thermal conductive filler is aluminum oxide, aluminum nitride. The method for producing a directional heat conductive sheet according to claim 3, wherein the material is one or more types of silicon carbide. In step S1, the mass ratio of the fibrous or sheet-like high thermal conductive filler to the silicone oil is 0.5 to 2.5, and the spherical thermal conductive filler occupies 50 to 80% of the total mass of the fluid composition. The method for manufacturing a directional heat conductive sheet according to claim 3. The method for producing a directional heat conductive sheet according to claim 1, wherein in step S1, the viscosity of the fluid composition is 200,000 to 3 million mPa · s. In step S2, the alignment molding apparatus drives the fluid composition so as to make a circular motion, and in the process of the circular motion, a high-speed shearing force is applied to the fluid composition along the circumference for each layer, and the fluid composition is contained. The method for producing a directional heat conductive sheet according to claim 1, wherein the heat conductive filler of No. 1 is oriented along a shearing direction to form an oriented thin layer composition. The material filling area is provided symmetrically along the central axis of the drum.
Here, the material filling region is two fan-shaped cylindrical regions provided symmetrically with respect to the central axis of the drum.
The method for manufacturing a directional heat conductive sheet according to claim 1, wherein an intermediate layer is provided in the sleeve, and the cooling medium is filled in the intermediate layer.

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