KR102332135B1 - The manufacturing method of thermally conductive sheet - Google Patents

Abstract

The present invention relates to a method for manufacturing a heat dissipation sheet, the purpose of which is to align a plate or fibrous heat conductive filler in a heat conductive silicone resin composition in the thickness direction of the heat dissipation sheet by compression molding of a sheet block by rotating mixing and three-way compression. It is to provide a method of manufacturing a heat dissipation sheet that can maximize heat dissipation efficiency.
The present invention is a corotatory mixing step in which a sheet material in a compound state including a plate-like or fibrous thermal conductive filler is corotatively mixed so that the thermally conductive filler in the sheet material is first aligned; A protective film attachment step in which the first aligned sheet material is wrapped by a protective film to form a preliminary block; A sheet block forming step in which the preliminary block is compressed simultaneously in three directions by the first, second, and third compression units of the three-way compressor, so that the thermally conductive filler in the sheet material is secondarily aligned and the sheet block is compression-molded; A curing step in which the sheet block is put into an oven and cured; Including; a heat radiation sheet forming step in which the cured sheet block is cut to a predetermined thickness to form a heat radiation sheet, and the plate or fibrous thermal conductive filler is oriented in the thickness direction (A) of the heat radiation sheet.

Description

Heat dissipation sheet manufacturing method {THE MANUFACTURING METHOD OF THERMALLY CONDUCTIVE SHEET}

The present invention relates to a method for manufacturing a heat dissipation sheet, in which a thermally conductive silicone resin composition is corotatively mixed so that plate-like or fibrous thermally conductive fillers in the thermally conductive silicone resin composition are first aligned, and by simultaneous compression in three directions by a three-way compressor It relates to a method of manufacturing a heat dissipation sheet in which a plate-shaped or fibrous thermally conductive filler in a thermally conductive silicone resin composition is secondarily aligned to improve thermal conductivity.

In general, electronic products such as computers, portable personal terminals, and communicators have serious concerns about afterimage problems and system stability because excessive heat generated inside the system cannot be diffused to the outside. Since such heat shortens the lifespan of a product or causes malfunction or malfunction, and in severe cases, it may also provide a cause of explosion and fire, it is becoming important to efficiently dissipate heat generated from electronic components.

Conventionally, heat dissipation fins, heat dissipation sheets, and heat sinks have been used as means for efficiently controlling the generated heat. It was small and the efficiency was very low, so there was a problem that a heat dissipation fan had to be installed together.

In particular, due to the simultaneous installation of the heat dissipation fan, noise and vibration generated by the heat dissipation fan occur, and there is a problem that cannot be applied to products requiring weight reduction and slimness. Sheets are widely used.

The conventionally used heat dissipation sheet is a thermally conductive sheet, in which inorganic fillers such as copper, alumina, ferrite, aluminum nitride, and aluminum hydroxide having thermal conductivity are dispersed and contained in a resin composition are widely used.

However, when the content of the inorganic filler is low, the heat dissipation sheet has very low thermal conductivity, and when the content of the inorganic filler is high, the content of other components is low, so that the bonding strength between the powders is reduced, and the flexibility and molding of the sheet In addition to the problem of lowering properties, the conventional thermally conductive sheet containing inorganic fillers has very low thermal conductivity of 1.5 to 5 W/m·K even when the content of inorganic fillers is increased, so that heat is not efficiently dissipated. There was a problem that I couldn't.

Recently, in order to solve the problems of the heat radiation sheet containing the inorganic filler as described above, a heat radiation sheet having increased thermal conductivity by further containing carbon fibers having anisotropy, etc. has been manufactured, but such a heat radiation sheet is not suitable for extrusion molding The sheet base material is formed by the method, and the cured sheet base material is sliced to a predetermined thickness to produce a heat dissipation sheet, so it is difficult to uniformly disperse the heat conductive filler during extrusion molding. In addition, since large-scale manufacturing equipment is required, there are various problems such as manufacturing cannot be performed in a narrow space.

Registered Patent Publication No. 10-1552636 (2015.09.07) Registered Patent Publication No. 10-1470362 (2014.12.02) Registered Patent Publication No. 10-1125743 (2012.03.05) Laid-Open Patent Publication No. 10-2014-0050920 (2014.04.30)

An object of the present invention is to maximize the heat dissipation efficiency by aligning the plate-shaped or fibrous thermally conductive filler in the thermally conductive silicone resin composition in the thickness direction of the heat-dissipating sheet by compression molding of the sheet block by rotating mixing and three-way compression. It is to provide a method for manufacturing a heat dissipation sheet.

The present invention is a corotatory mixing step in which a sheet material in a compound state including a plate-like or fibrous thermal conductive filler is corotatively mixed so that the thermally conductive filler in the sheet material is first aligned; A protective film attachment step in which the first aligned sheet material is wrapped by a protective film to form a preliminary block; A sheet block forming step in which the preliminary block is compressed simultaneously in three directions by the first, second, and third compression units of the three-way compressor, so that the thermally conductive filler in the sheet material is secondarily aligned and the sheet block is compression-molded; A curing step in which the sheet block is put into an oven and cured; Including; a heat radiation sheet forming step in which the cured sheet block is cut to a predetermined thickness to form a heat radiation sheet, and the plate or fibrous thermal conductive filler is oriented in the thickness direction (A) of the heat radiation sheet.

The present invention provides a plate-like or fibrous thermal conductive filler in the thickness direction of the manufactured heat dissipation sheet through the primary alignment of the plate-shaped or fibrous thermal conductive filler by corotational mixing, and the secondary alignment of the plate-shaped or fibrous thermal conductive filler by the three-way compression of the three-way compressor. Since the fibrous thermally conductive filler is oriented, there is an effect that the thermal conductivity of the heat dissipation sheet is dramatically improved.

1 is an exemplary view showing a manufacturing process according to the present invention;
2 is an exemplary view showing the configuration of a three-way compressor according to the present invention;
3 is an exemplary view showing the configuration of the first, second, and third compression bands according to the present invention;
4 is an exemplary view showing an operating state of the three-way compressor according to the present invention;
5 is an exemplary view showing the configuration of a heat dissipation sheet according to the present invention;

1 is an exemplary view showing a manufacturing process according to the present invention, FIG. 2 is an exemplary view showing the configuration of a three-way compressor according to the present invention, and FIG. 4 is an exemplary view showing the operating state of the three-way compressor according to the present invention, Figure 5 is an exemplary view showing the configuration of the heat dissipation sheet according to the present invention,

The present invention is a corotatory mixing step in which a sheet material in a compound state including a plate-like or fibrous thermal conductive filler is corotatively mixed so that the thermally conductive filler in the sheet material 10 is first aligned;

A protective film attachment step in which the first aligned sheet material 10 is wrapped by a protective film 20 to form a preliminary block 30;

The preliminary block 30 is simultaneously compressed in three directions by the first, second, and third compression units 110, 120, and 130 of the three-way compressor 100 so that the thermal conductive filler in the sheet material 10 is secondarily aligned while the seat block 40 ) is a sheet block forming step that is compression-molded;

A curing step in which the sheet block 40 is put into the oven 200 and cured;

Including; a heat dissipation sheet forming step in which the cured sheet block 40 is cut to a predetermined thickness to form a heat dissipation sheet 50

The plate-shaped or fibrous thermally conductive filler is oriented in the thickness direction A of the heat dissipation sheet 50 .

In the revolving mixing step, the sheet material 10 in the compound state is mixed by the revolving mixing method, bubbles in the sheet material 10 are removed, and the thermally conductive filler in the sheet material 10 is uniformly dispersed. At the same time, the thermally conductive filler is first aligned.

The corotation mixing of the sheet material 10 is made by a corotation mixer, and the sheet material 10 is put into the corotation mixer 400 as a container and rotates corotationally.

The orbital speed and rotation speed of the sheet material 10 is 50 to 2,000 rpm, preferably about 100 to 1,000 rpm, more preferably about 150 to 500 rpm, for about 3 to 20 minutes, preferably about 3 to 10 It rotates for about a minute and mixes.

At this time, the rotation speed of the sheet material 10 by the revolving mixer machine is set to be the same as or faster than the revolving speed, preferably set to be the same as the revolving speed and the revolving speed.

When the corotation speed and the mixing time are set in this way, the primary alignment effect of the thermally conductive filler is improved. That is, when the sheet material 10 of the present invention is mixed with a kneading equipment such as Kneader or Planetry, rather than corotatory mixing, plate-shaped or fibrous thermally conductive filler, in particular, fibrous thermally conductive filler is sprayed or entangled with each other, so sufficient mixing This cannot be achieved, but, as in the present invention, when the sheet material is corotatively mixed, the alignment effect of the plate-shaped or fibrous thermally conductive filler is achieved.

The sheet material 10 is a thermally conductive silicone resin composition containing a plate-like or fibrous thermally conductive filler 11, and is mixed by a corotatory mixer at room temperature (about 1 ℃ to 35 ℃) rather than a hard solid, and a three-way compressor It may be made of a thermally conductive silicone resin composition consisting of a one-component or two-component type consisting of a mixed compound state (a dough form maintaining a constant shape) that can be compression molded into a sheet block by

That is, the sheet material 10 is corotatory mixing, compression-molded by the three-way compressor 100, and it is sufficient if it contains the plate-shaped or fibrous thermally conductive filler 11, so the composition is not limited.

The sheet material 10 may be made of, for example, a thermally conductive silicone resin composition containing 70 to 140 parts by weight of a plate-shaped or fibrous thermally conductive filler based on 100 parts by weight of polyorganosiloxane.

In addition, the thermally conductive silicone resin composition, based on 100 parts by weight of polyorganosiloxane, 240 to 350 parts by weight of a thermally conductive filler; 70 to 140 parts by weight of plate-like or fibrous thermally conductive filler; 0.0001 to 0.1 parts by weight of a platinum catalyst,

The polyorganosiloxane includes 20 to 60 wt% of a first polydiorganosiloxane having two or more unsaturated hydrocarbon groups, 30 to 70 wt% of a second polydiorganosiloxane having one or two hydroxyl groups, the terminal 5 to 40 wt% of the third polydihydrogen siloxane having a hydrogen group, and 0.2 to 5 wt% of the fourth polydihydrogen siloxane having two or more hydrogen groups.

The first polydiorganosiloxane includes dimethyl siloxane in which both ends of the molecular chain are blocked with dimethylvinylsiloxane groups, dimethyl siloxane methylphenylsiloxane copolymer in which both ends of the molecular chain are blocked by dimethylvinylsiloxane groups, and both molecular chains It is a copolymer of dimethyl siloxane and methyl trifluoropropyl siloxane whose stage is blocked with a dimethylvinylsiloxane group, containing 0.002 to 0.1 mol% of the total organic groups, and a viscosity of 1,000 to 100,000 cp at 25°C may be used.

The first polydiorganosiloxane may be represented by the following [Formula 1], in which R1 does not contain an aliphatic unsaturated bond or has 1 to 10 substituted carbon atoms, particularly 1 to 5 carbon atoms A monovalent hydrocarbon is preferable, for example, a lower alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, an aryl group such as a phenyl group, a xylyl group, a benzene group, a cycloalkyl group such as a cyclohexyl group, or a hydrogen atom of these groups A chloromethyl group, a cyanomethyl group, a 3,3,3,-trifluoropropyl group, etc. partially or completely substituted with a halogen atom, a cyano group, etc., and n is 0 or a positive integer.

[Formula 1]

The second polydiorganosiloxane includes dimethyl siloxane in which both ends of the molecular chain are blocked with dimethylhydroxy siloxane groups, dimethyl siloxane methyl phenylsiloxane copolymer in which both ends of the molecular chain are blocked with dimethylhydroxysiloxane groups, A copolymer of dimethyl siloxane and methyl trifluoropropyl siloxane whose both ends are blocked with dimethyl hydroxy siloxane groups, which do not contain unsaturated hydrocarbon groups and have a viscosity of 100 to 200,000 cp at 25°C may be used.

The second polydiorganosiloxane may be represented by the following [Formula 2], in which R 1 does not contain an aliphatic unsaturated bond or has 1 to 10 substituted carbon atoms, particularly 1 to 5 carbon atoms, monovalent Hydrocarbons are preferable, for example, lower alkyl groups such as methyl group, ethyl group, propyl group, butyl group, aryl group such as phenyl group, xylyl group, benzene group, cycloalkyl group such as cyclohexyl group, or a part of hydrogen atoms of these groups; A chloromethyl group, a cyanomethyl group, a 3,3,3,-trifluoropropyl group, etc. all substituted with a halogen atom, a cyano group, etc., and n is 0 or a positive integer.

[Formula 2]

The third polydihydrogen siloxane includes dimethyl siloxane in which both ends of the molecular chain are blocked by dimethylhydrogensiloxane groups, dimethyl siloxane methyl phenylsiloxane copolymer in which both ends of the molecular chain are blocked by dimethylhydrogensiloxane groups, molecules As a copolymer of dimethyl siloxane and methyl trifluoropropyl siloxane in which both ends of the chain are blocked with dimethylhydrogensiloxane groups, those containing no aliphatic unsaturated hydrocarbon group and having a viscosity of 100 to 100,000 cp at 25°C may be used.

The third polydihydrogen siloxane may be represented by the following [Formula 3], wherein R 1 does not contain an aliphatic unsaturated bond or has 1 to 10 substituted carbon atoms, particularly 1 with 1 to 5 carbon atoms A valent hydrocarbon is preferable, for example, a lower alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, an aryl group such as a phenyl group, a xylyl group, a benzene group, a cycloalkyl group such as a cyclohexyl group, or a part of hydrogen atoms of these groups or a chloromethyl group, cyanomethyl group, 3,3,3,-trifluoropropyl group, etc. all substituted with a halogen atom, a cyano group, etc., and n is 0 or a positive integer.

[Formula 3]

The fourth polydihydrogen siloxane is a copolymer of dimethylsiloxane and methylhydrogensiloxane in which both ends of the molecular chain are blocked with trimethylsiloxane groups, and has at least two hydrogen atoms bonded to silicon atoms in one molecule. Those containing 1 to 15 mol% of hydrogen groups of the entire organic group and having a viscosity of 100 to 20,000 cp at 25°C may be used.

The fourth polydihydrogen siloxane may be represented by the following [Formula 4], in which R1 and R4 do not contain an aliphatic unsaturated bond or have 1 to 10 substituted carbon atoms, particularly 1 to 5 carbon atoms monovalent hydrocarbons are preferable, for example, lower alkyl groups such as methyl group, ethyl group, propyl group, butyl group, aryl group such as phenyl group, xylyl group, benzene group, cycloalkyl group such as cyclohexyl group, or hydrogen of these groups A chloromethyl group, cyanomethyl group, 3,3,3,-trifluoropropyl group, etc. in which some or all of the atoms are substituted with halogen atoms, cyano groups, etc., and n and m are 0 or positive integers.

[Formula 4]

As the thermally conductive filler 12, 240 to 350 parts by weight, preferably 260 to 300 parts by weight, is added based on 100 parts by weight of polyorganosiloxane, and alumina, aluminum hydroxide (ATH), magnesium oxide (MgO), and nitride Boron (BN) or the like may be used.

The thermally conductive filler 12 is most preferably alumina or magnesium oxide (MgO), and the alumina having a particle size of 5 to 45 μm is used, and preferably a particle size of 5 to 25 μm is used.

The plate-shaped or fibrous thermally conductive filler 11 is added in an amount of 70 to 140 parts by weight, preferably 70 to 90 parts by weight, based on 100 parts by weight of polyorganosiloxane, graphite, carbon black. , a plate-like or fibrous thermally conductive filler such as carbon fiber is used, and carbon fiber is preferably used.

The carbon fiber may have a diameter of 5 to 30 μm and a length of 50 to 400 μm, and preferably a particle diameter of 5 to 15 μm and a length of 50 to 250 μm.

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중 선택된 하나 또는 하나 이상 또는 이들을 포함한 것이 사용되어질 수 있다. As the platinum catalyst, a known platinum or platinum compound used as a catalyst in a silicone composition is used. That is, the platinum catalyst is an example, elemental platinum,

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One selected from among, one or more, or those including these may be used.

In addition, the sheet material 10 may contain an appropriate amount of a known curing agent, a curing accelerator, etc. used in the silicone resin composition, and the content of such curing agent or curing accelerator corresponds to a known technology, so the detailed description thereof is omit

In addition, the sheet material 10, the manufacturing method is not specified, mixing by a co-rotation mixer at room temperature (about 1 ℃ ~ 35 ℃), and compression molding to a sheet block by a three-way compressor It is enough to be manufactured.

For example, in the sheet material 10, the polyorganosiloxane and the plate or fibrous thermally conductive filler are sufficiently dispersed using a mixing device such as a Kneader or a planetary mixer, and then cooled to 70° C. or less and then platinum It can be formulated by mixing the catalyst. At this time, the platinum catalyst must be mixed at 70° C. or less, and when the platinum catalyst is mixed in a state exceeding 70° C., it is cross-linked in the mixing process, making it impossible to use as a sheet material capable of co-rotational mixing.

The step of attaching the protective film is a step in which the sheet material 10, which is freely mixed, is wrapped by the protective film 20 to form a preliminary block 30, the protective film 20 is the sheet material (10) A function to facilitate the formation of the preliminary block 30, a function to facilitate the compression of the preliminary block 30 during three-way compression (height direction compression and left/right width direction compression) by the three-way compressor 100 And, it has a function of protecting the finally manufactured heat dissipation sheet (50).

In the step of attaching the protective film, for example, after a predetermined amount of the sheet material 10 is put on the protective film 20, the sheet material 10 is wrapped by the protective film 20 and a preliminary block having a predetermined shape ( 30) is formed.

That is, the preliminary block 30 means a state in which the sheet material 10 is wrapped by the protective film 20 to form a single mass, and the first, second, and third compression units 110 , 120 , 130 of the three-way compressor 100 . ) is formed to have a predetermined size enough to be put into the compression space 150 formed by the

In addition, the formation of the preliminary block 30 of the sheet material 10 by the protective film 20 may be made manually by a worker or may be made automatically by a lapping method.

In addition, since the protective film 20 is a known protective film used for a heat dissipation sheet, the material is not limited, but polyethylene (PE), poly Propylene (PP), polyester (PET) films, etc. may be used.

The sheet block forming step is a step of compression molding the preliminary block 30 into the sheet block 40 by the three-way compressor 100, and between the first, second, and third compression parts 110, 120, and 130 of the three-way compressor 100. That is, after the preliminary block 30 is put in the compression space 150 to be positioned, the preliminary block 30 is moved in the height direction and the width direction (left and right directions) by the first, second, and third compression units 110 , 120 , 130 . is simultaneously press-compressed and compression-molded into the seat block 40 .

The three-way compressor 100 is a first compression unit ( 110), a second compression unit 120 fixedly installed on the other side of the compression table 141 to face the first compression unit and horizontally operated in the direction of the first compression unit, the first compression unit and the second compression unit It is installed on the compression table 141 so as to be positioned between the third compression unit 130 vertically operated in the vertical direction.

The support unit 140 includes a compression table 141 to which the first, second, and third compression units 110, 120, and 130 are fixedly installed, and a leg frame 142 for supporting the compression table 141 at a predetermined height from the floor. do.

The first compression unit 110 horizontally presses the preliminary block 30 in one direction, and the first cylinder 111 is fixedly installed on the compression table 141, and is fixed to the rod end of the first cylinder. and a first crimping unit 112 for pressing one side of the preliminary block 30 .

The first cylinder 111 is fixedly installed on one side of the upper surface of the compression table 141 by the cylinder bracket 113 . The first cylinder 111 is a pneumatic or hydraulic cylinder is installed, preferably a pneumatic cylinder is installed.

The first crimp bar 112 is integrally formed with a lower crimp bar 115 fixed to the rod 114 of the first cylinder, and an upper end of the lower crimp bar 115, and a plurality of upper open-type guide crimping holes ( 117) includes an upper compression plate 116 formed thereon.

That is, in the first crimping platform 112 , the upper crimping unit 116 is integrally formed on the upper side of the lower crimping unit 115 , and the upper crimping unit 116 is formed in the height direction (upward direction), that is, the third It is formed in a concave-convex type having a plurality of guide compression holes 117 opened in the direction of the compression part.

In addition, the first crimping base 112 has support protrusions 119 protruding from both sides of the lower side of the rear side of the lower crimping bar 115, that is, one side where the first cylinder 111 is installed, and the support protrusions ( 119, when the first crimping platform 112 presses one side of the preliminary block 30 by the operation of the first cylinder 111, the pressure contact between the preliminary block 30 and the first crimping unit 112 It has a function of preventing the conduction phenomenon of the first compression band 112 that may be generated by the . That is, it has a function of assisting the first compression table 112 to be moved in the horizontal direction while maintaining a vertical state with respect to the compression table 141 .

In addition, the first compression unit 110 may be configured such that a first horizontal support 118 is further installed between the rod 114 of the first cylinder and the first compression member 112 . That is, the first horizontal support 118 may be fixedly installed at the rod end of the first cylinder, and the first horizontal support 118 may be configured such that the lower crimping member 115 of the first crimping member is integrally fixed.

In this way, when the first horizontal support 118 is further installed, when the first crimping base 112 is horizontally moved by the first cylinder 111, both ends of the first crimping base 112 are moved in the front-rear direction (cylinder). in the direction of operation) is prevented. At this time, the first horizontal support 118 is in surface contact with the end of the rod 114 of the first cylinder and the first crimping board 115, respectively, and is integrally fixed and installed by welding or fastening means such as bolts/nuts.

The second compression unit 120 presses the preliminary block 30 in the other direction, that is, in a direction opposite to the first compression unit 110 , and a second cylinder 121 fixedly installed on the compression table 141 . And, a second crimping unit 122 fixed to the rod end of the second cylinder and pressing the other side of the preliminary block 30, and a second crimping unit 112 at both ends of the second crimping unit 122 and It includes both ends of the compression bands 129 installed to be perpendicular to the first compression unit 110 to protrude in the direction.

The second cylinder 121 is fixedly installed on the other side of the upper surface of the compression table 141 by the cylinder bracket 123 so as to be symmetrical with the first cylinder 111 . The second cylinder 121, like the first cylinder 111, a pneumatic or hydraulic cylinder is installed, preferably a pneumatic cylinder is installed.

The second crimping bar 122 is formed integrally with the lower crimping bar 125 fixed to the rod 124 of the second cylinder and the upper end of the lower crimping bar 125, and a plurality of upper open-type guide crimping holes ( 127) includes an upper compression plate 126 formed thereon.

That is, the second crimping base 122 has a concave-convex type upper crimping base 126 having a plurality of guide crimping holes 127 on the upper side of the lower crimping base 125 like the first crimping base 112 . It has an integrally formed structure and is fixedly installed on the rod 124 of the second cylinder so as to be symmetrical to the first crimping platform 112 .

The both ends of the compression band 129 are vertically fixed and integrally installed at both ends of the lower side of the first compression band 125 so as to protrude in the direction of the first compression unit 110, and the first and second compression units 110 and 120 ), a function of forming the front/rear surface of the seat block 40 by preventing the preliminary block 30 from being separated between the first and second compression plates 112 and 122 during compression molding of the preliminary block 30 by The first compression unit 112 and the second compression unit 122 of the second compression unit are maintained in parallel and have a guide function to move to the preliminary block 30 .

In addition, when the compression molding of the preliminary block 30 by the first and second compression units 110 and 120 is performed, the both ends of the compression bands 129 are compression-molded together with the first and second compression bands 112 and 122 . A compression space 150 is formed for this purpose.

In addition, the both ends of the compression band 129 is formed with a plurality of spare holes 129a, and the spare holes 129a are press-molded by the first, second, and third compression parts 110, 120, and 130 of the seat block 40. When necessary, not only the sheet block 40 of a certain shape is formed by the smooth operation of the first, second, and third compression units 110, 120, and 130, but also air bubbles remaining in the sheet block 40 during compression molding are removed to the outside. It has a function of discharging, and a function of discharging a surplus amount exceeding the volume of the finally compression-molded seat block 40 to the outside of the compression space 150 .

Although the shape of the spare hole 129a is not specified, it is preferable that a plurality of the clearance holes 129a are stacked in the longitudinal direction of the both ends of the compression band 129 .

In addition, the second compression unit 120 may be configured such that a second horizontal support 128 is further installed between the rod end of the second cylinder and the second compression rod. That is, the second horizontal support 128 is fixedly installed at the end of the rod 124 of the second cylinder, and the second horizontal support 128 is integrally fixed with the lower crimping rod 125 of the second crimping rod, Both ends of the second horizontal support member 128 and the both ends of the lower compression bar 125 may be configured to be integrally fixed and installed at both ends.

In this way, when the second horizontal support 128 is further installed, when the second crimping base 122 is horizontally moved by the second cylinder 121 , the both ends of the crimping base 129 move in the front-rear direction (the second cylinder operating direction). ) to prevent flow. At this time, the second horizontal support 128 is in surface contact with the end of the rod 124 of the second cylinder, the second crimping bar 122 and the both ends of the crimping base 129, respectively, so as to be connected to a fastening means such as welding or bolts/nuts. It is fixedly installed integrally by

The third compression unit 130 includes an upper support 133 fixed and installed by a plurality of guide posts 139 so as to be spaced apart from each other by a predetermined distance on the upper side of the compression table 141 of the support unit 140 , and a guide post 139 . The third crimping base 132 installed between the upper support 133 and the compression table 141 so as to be raised and lowered along the ), including

The third crimping base 132 is integrally fixed and installed at both ends of the central crimping base 135 to which the rod 134 end of the third cylinder is connected and installed, and the guide post 139 The first and second elevating and descending plates 136 and 137 that are raised and lowered along the It includes a plurality of wing compression rods 138 that are inserted and coupled into the guide compression holes 117 and 127.

The central compression table 135 is in contact with the upper portion of the preliminary block 30 when the third compression table 132 is lowered by the third cylinder 131 to move the preliminary block 30 toward the compression table 141 . It has a function of pressing and pressing with

The wing crimping unit 138 is inserted and coupled into the guide compression holes 117 and 127 of the first and second crimping units when the third crimping unit 132 is lowered by the third cylinder 131 , and the central crimping unit 135 . ) is stably moved downward and has a function to allow the preliminary block 30 to be press-compressed.

The first and second elevating plates 136 and 137 are to support the third crimping base 132 to be elevated along the guide post 139, and guide bushes 136a and 137a between the first and second elevating plates 136 and 137. ) is installed.

In addition, a third horizontal support 135a may be further installed on the central compression rod 135 of the third compression rod 132, and the third horizontal support 135a is used as a medium to be centrally compressed to the third cylinder. The stand 135 may be connected and installed.

The third horizontal support 135a is a function of pressing and compressing the entire preliminary block while maintaining the horizontal position of the central compression rod 135 when the third cylinder 132 is lowered and the preliminary block is pressed. to provide

The third crimping platform 132 configured in this way has a structure that is symmetrical to each other in the vertical, left and right directions, that is, the third crimping unit 132 has a plurality of wing compression units 138 between the first and second elevating and descending plates 136 and 137. ) are spaced apart so as to be parallel to each other, and the first and second elevating and descending plates 136 and 137 and the central compression rod 135 are integrally formed or fixedly installed so as to be orthogonal along the center of the plurality of wing compression rods 138. have.

At this time, by the plurality of wing crimping bands 138 spaced apart from the third crimping band 132 , the upper crimping bands 116 and 126 of the first and second crimping bands are between one wing crimping band and another wing crimping band adjacent thereto. ) is to be inserted and coupled to the guide compression hole (138a) is formed.

The three-way compressor 100 configured as described above is provided with a first compression unit and a second compression unit horizontally operated to be symmetrical to each other on both sides of the compression table 141 of the support unit 140 , and the first compression unit and the second compression unit A third compression unit vertically operated to be positioned between the parts is installed, and the compression space 150 is a space between the first compression unit of the first compression unit, the second compression unit of the second compression unit, and the third compression unit of the third compression unit. After the preliminary block 30 is put into the , the interdigital coupling method of the first, second, and third crimps according to the operation of the first, second, and third compression units, that is, the guide compression holes ( 117 and 127), the wing crimping band 138 of the third crimping band is inserted and coupled, and the upper crimping bands 116 and 126 of the first and second crimping bands are inserted into the guide crimping hole 138a of the third crimping band, and the preliminary block 30 is inserted. This pressure-compression compression, the rectangular parallelepiped-shaped seat block 40 having a certain size is molded.

At this time, the first, second, and third compression units 110, 120, and 130 are 1, 2, and 3 at a speed of 1 to 20 m/min, preferably about 1 to 10 m/min, more preferably about 3 to 5 m/min. The compression band is operated to press and compress the preliminary block 30 to compress the seat block 40 .

That is, in the three-way compressor 100, the preliminary block 30 is compression molded in the width (W) direction by the first and second compression units 110 and 120, and the preliminary block 30 by the third compression unit 130. It is compression molded in the height (H) direction, and the preliminary block 30 is compressed at a compression ratio of about 45 to 75% in the width direction (W) and the height direction (H) to be compression molded into the seat block (40).

As an example, by the first, second, and third compression units 110, 120, and 130 operated to press-compress the preliminary block 30 at a speed of 1 to 20 m/min, (width, W), ( When compressed to have a compression ratio of about 66% of height, H), the preliminary block 30 of 180 mm (width, W) × 180 mm (height, H) × 70 mm (length, L) is 60 mm (width, W) × 60 mm (height, H) × 630 mm (length, L) of the sheet block 40 will be compression molded.

When the operating speed (compression speed) of the first, second, and third compression units 110, 120, and 130 is less than 1 m/min, a preliminary block from the space between the first, second, and third compression units of the first, second, and third compression units during compression This may deviate, and when it exceeds 20 m/min, the alignment effect of the plate-shaped or fibrous thermally conductive filler is reduced, that is, the plate-shaped or fibrous thermally conductive filler is disturbed or entangled with each other, resulting in a decrease in thermal conductivity.

The curing step is a step in which the compression-molded sheet block 40 is put into the oven 200 and cured, and the sheet block 40 is heated at 30° C. to 180° C., preferably about 10 to about 100° C. to 150° C. Cure for 60 minutes, preferably about 20-30 minutes.

The heat dissipation sheet forming step is a step of forming the heat dissipation sheet 50 by cutting the cured sheet block 40 to a predetermined thickness (d) by a cutting machine 300, and the cutting machine 300 is an ultrasonic cutting machine or a cylinder A slice cutter, etc. in which the slice blade is operated by the , may be used. Since the ultrasonic cutter and the slice cutter are well-known, detailed description thereof will be omitted.

In addition, the present invention provides a sheet or fibrous thermal conductive filler 11 by surface-treating one surface of the sheet block 40 or heat dissipation sheet 50 with sandpaper before or after the heat dissipation sheet forming step or after the heat dissipation sheet forming step to form a sheet block ( 40) or may further include a surface treatment step to be exposed on the surface of the heat dissipation sheet (50).

Such a surface treatment step exposes a portion of the thermally conductive filler on the surface of the heat dissipation sheet, thereby improving the flatness of the top surface of the heat dissipation sheet as well as the effect of further increasing the heat conduction efficiency.

In the heat dissipation sheet 50 manufactured by the above manufacturing method, the plate or fibrous thermal conductive filler 11 is oriented in the thickness direction A of the heat dissipation sheet 50 by corotatory mixing and three-way compression, and thermal conductivity 10 W/m·K or more will be provided.

Example 1

를 비닐실록산에 컴플랙스한 화합물 0.0001중량부를 유성형 혼합기(planetary mixer)를 사용하여 균일하게 혼합하여 시트소재를 제조하였다. Based on 100 parts by weight of polyorganosiloxane, 270 parts by weight of spherical alumina having an average particle diameter of 5 μm and a BET surface area of 0.5, carbon fiber having an average particle diameter of 10 μm and a length of 150 μm, 70 parts by weight, and a platinum catalyst

A sheet material was prepared by uniformly mixing 0.0001 parts by weight of the compound complexed with vinyl siloxane using a planetary mixer.

At this time, the polyorganosiloxane has a viscosity of 10,000 cP and 46 parts by weight of dimethyl siloxane in which both ends of the molecular chain are blocked with dimethylvinylsiloxane groups, the viscosity is 100 cP, and both ends of the molecular chain are blocked with dimethylhydroxy groups 38 parts by weight of a dimethyl siloxane methyl phenylsiloxane copolymer, 14 parts by weight of a dimethyl siloxane methyl phenylsiloxane copolymer having a viscosity of 100 cP and blocking both ends of the molecular chain with dimethylhydrogensiloxane groups, a viscosity of 50 cP and trimethylsiloxane groups A blocked dimethylsiloxane and methylhydrogen siloxane copolymer consisting of 2 parts by weight was used.

After mixing the sheet material prepared as described above at a revolving speed according to [Table 1] below, each wrapped in a protective film (PET) to form a preliminary block (width 180 mm × height 180 mm × length 70 mm), and formed The preliminary block was press-molded into a sheet block (width 60 mm × height 60 mm × length 630 mm) by a three-way compressor, and the press-molded sheet block was cured in an oven (150° C., 10 minutes), and a slice cutter It was cut and molded into a heat-dissipating sheet having a thickness of 2 mm. At this time, the first, second, and third compression units of the three-way compressor compressed the preliminary block at 3 m/min to form a sheet block.

Specific gravity, hardness, and thermal conductivity of the heat dissipation sheet thus prepared were measured, and the results are shown together in [Table 1].

[Table 1]

As shown in [Table 1], it can be seen that there is a difference in thermal conductivity according to the revolving speed, and all of the heat dissipation sheets (No. It can be seen that they are available.

Example 2

After mixing the sheet material according to Example 1 at the idle rotation speed and mixing time according to [Table 2] below, it is wrapped in a protective film (PET) to form a preliminary block (width 180 mm × height 180 mm × length 70 mm) And, the formed preliminary block was press-molded into a sheet block (width 60 mm × height 60 mm × length 630 mm) by a three-way compressor, and the press-molded sheet block was cured in an oven (150° C., 10 minutes), It was cut and molded into a heat-dissipating sheet having a thickness of 2 mm by a slice cutter. At this time, the first, second, and third compression units of the three-way compressor compressed the preliminary block at 3 m/min to form a sheet block.

Specific gravity, hardness, and thermal conductivity of the thus-prepared heat dissipation sheet were measured, and the results are shown together in [Table 2].

[Table 2]

As shown in [Table 2], it can be seen that there is a difference in the thermal conductivity according to the revolving speed and the mixing time, the thermal conductivity is improved as the mixing time is increased, and the revolving speed is the thermal conductivity starting at 1,500 rpm is lowered, but it can be seen that it has excellent thermal conductivity of 10 W/m·K even at 2,000 rpm.

Example 3

After mixing the sheet material according to Example 1 at the idle rotation speed and mixing time according to [Table 3] below, it is wrapped in a protective film (PET) to form a preliminary block (width 180 mm × height 180 mm × length 70 mm) Then, the formed preliminary block was press-molded into a sheet block (width 60 mm × height 60 mm × length 630 mm) by setting the compression speed differently using a three-way compressor, and the press-molded sheet block was cured in an oven (150 ° C.) , 10 minutes), and cut and molded into a heat dissipation sheet having a thickness of 2 mm by a slice cutter. Specific gravity, hardness, and thermal conductivity of the heat dissipation sheet thus prepared were measured, and the results are shown together in [Table 3].

[Table 3]

As shown in [Table 3], it can be seen that there is a difference in the thermal conductivity of the heat dissipation sheet according to the compression speed of the three-way compressor.

As in Examples 1 to 3 above, it can be seen that there is a significant difference in the thermal conductivity of the heat dissipation sheet according to the revolving speed, the mixing time, and the compression speed, and the heat dissipation sheet according to the present invention has a minimum It can be seen that it has excellent thermal conductivity of 10 W/m·K or more.

In particular, when the revolving speed is 150 to 500 rpm, it can be seen that at least 17 W/m·K or more excellent thermal conductivity is provided.

That is, the heat dissipation sheet manufactured of the present invention is the primary alignment of the plate-shaped or fibrous thermally conductive filler in the thermally conductive silicone resin composition by co-rotational mixing, the width (W) direction and height of the preliminary block 30 according to the three-way compressor ( Excellent thermal conductivity is provided by secondary alignment of the plate-shaped or fibrous thermally conductive filler in the thermally conductive silicone resin composition by compression molding in the H) direction.

The present invention is not limited to the specific preferred embodiments described above, and without departing from the gist of the present invention as claimed in the claims, anyone with ordinary skill in the art to which the invention pertains can make various modifications. Of course, such modifications are intended to be within the scope of the claims.

(10): sheet material
(11): plate-like or fibrous thermally conductive filler
(12): thermally conductive filler (20): protective film
(30): spare block (40): seat block
(50): heat dissipation sheet (100): three-way compressor
(110): first compression unit (111): first cylinder
(112): 1st crimping base (113): Cylinder bracket
(114): Rod (115): Bottom crimp
(116): upper crimping bar (117): guide crimping hole
(118): the first horizontal support (120): the second compression unit
(121): second cylinder (122): second crimping stand
(123): cylinder bracket (124): rod
(125): lower crimping bar (126): upper crimping bar
(127): guide compression hole (128): second horizontal support
(129): both ends crimping stand (129a): spare hole
(130): the third compression unit (131): the third cylinder
(132): the third crimping bar (133): the top support
(134): Rod (135): Central press
(135a): first horizontal support (136): first elevating plate
(137): 2nd elevating plate (138): wing compression stand
(138a): Gaardi compression hole (139): guide post
(140): support (141): compression table
(142): leg frame (150): compression space
(200) : Oven (300) : Cutting Machine
(400): revolution mixer

Claims (11)

A corotatory mixing step in which a sheet material in a compound state including a plate-shaped or fibrous thermal conductive filler is corotatively mixed so that the thermally conductive filler in the sheet material 10 is first aligned;
A protective film attachment step in which the first aligned sheet material 10 is wrapped by a protective film 20 to form a preliminary block 30;
The preliminary block 30 is simultaneously compressed in three directions by the first, second, and third compression units 110, 120, and 130 of the three-way compressor 100 so that the thermal conductive filler in the sheet material 10 is secondarily aligned while the seat block 40 ) is a sheet block forming step that is compression-molded;
A curing step in which the sheet block 40 is put into the oven 200 and cured;
Including; a heat dissipation sheet forming step in which the cured sheet block 40 is cut to a predetermined thickness to form a heat dissipation sheet 50
Heat dissipation sheet manufacturing method, characterized in that the plate or fibrous thermal conductive filler is oriented in the thickness direction (A) of the heat dissipation sheet (50).
The method of claim 1 ;
The sheet material 10 is revolved for about 3 to 20 minutes at an orbital speed of 50 to 2,000 rpm and a rotation speed of 50 to 2,000 rpm,
The preliminary block 30 is compression molded into the seat block 40 by the first, second, and third compression units 110, 120, 130 operated at a speed of 1 to 20 m/min,
The preliminary block 30 is compressed at a compression rate of 45 to 75% in the width (W) direction by the first and second compression units 110 and 120 , and the preliminary block 30 has a height (H) by the third compression unit 130 . ) direction, compressed at a compression ratio of 45 to 75%, and compression-molded into a sheet block (40).
3. The method of claim 2;
The rotation speed of the sheet material (10) is the same as the revolving speed, or a method of manufacturing a heat dissipation sheet, characterized in that set to be faster than the revolving speed.
The method of claim 1 ;
The sheet material, based on 100 parts by weight of polyorganosiloxane, 240 to 350 parts by weight of a thermally conductive filler; 70 to 140 parts by weight of plate-like or fibrous thermally conductive filler; Consists of a thermally conductive silicone resin composition containing 0.0001 to 0.1 parts by weight of a platinum catalyst,
The polyorganosiloxane includes 20 to 60 wt% of a first polydiorganosiloxane having two or more unsaturated hydrocarbon groups, 30 to 70 wt% of a second polydiorganosiloxane having one or two hydroxyl groups, terminal 5 to 40 wt% of a third polydihydrogen siloxane having a hydrogen group, and 0.2 to 5 wt% of a fourth polydihydrogen siloxane having two or more hydrogen groups,
The thermally conductive filler is made of one selected from alumina, aluminum hydroxide (ATH), magnesium oxide (MgO), boron nitride (BN),
The plate-shaped or fibrous thermally conductive filler is a method for manufacturing a heat dissipation sheet, characterized in that it is made of graphite or carbon black or carbon fiber.
delete The method of claim 1 ;
Three-way compressor 100,
A support unit 140 into which the preliminary block 30 is put on the compression table 141, a first compression unit 110 fixedly installed on one side of the compression table 141 and operated in the horizontal direction, and a first compression unit The second compression unit 120 is fixedly installed on the other side of the compression table 141 to be opposed to the second compression unit 120 operating in the horizontal direction, and the compression table 141 is installed to be positioned between the first compression unit and the second compression unit. A method of manufacturing a heat dissipation sheet comprising a third compression unit 130 vertically operated in the vertical direction.
7. The method of claim 6;
The first compression unit 110 includes a first cylinder 111 fixedly installed on the compression table 141 and a first compression bonding unit fixed to the rod end of the first cylinder to press one side of the preliminary block 30 . a stand (112);
The second compression unit 120 includes a second cylinder 121 fixedly installed on the compression table 141 and a second compression platform fixedly installed on the rod end of the second cylinder to press the other side of the preliminary block 30 . (122) and at both ends of the second crimping unit 122, and orthogonal to the second crimping unit 112 and protruding in the direction of the first compression unit 110;
The third compression unit 130 includes an upper support 133 fixed and installed by a plurality of guide posts 139 to be spaced apart by a predetermined distance on the upper side of the compression table 141 of the support unit 140 , and a guide post 139 . The third crimping base 132 installed between the upper support 133 and the compression table 141 so as to be raised and lowered along the ) Heat dissipation sheet manufacturing method comprising the.
8. The method of claim 7;
The first crimping bar 112 is formed integrally with the lower crimping bar 115 fixed to the rod 114 of the first cylinder, and the upper end of the lower crimping base 115, and a plurality of upper open-type guide crimping holes ( 117) includes an upper compression band 116 formed therein,
The second crimping base 122 is formed integrally with the lower crimping bar 125 fixed to the rod 124 of the second cylinder, and the upper end of the lower crimping base 125, and a plurality of upper open-type guide crimping holes ( 127) includes an upper compression band 126 formed thereon,
The third crimping base 132 is integrally fixed to both ends of the central crimping base 135 to which the rod 134 end of the third cylinder is connected and installed, and to both ends of the central crimping base 135 to guide post 139 . The first and second elevating and descending plates 136 and 137 that are raised and lowered along the Including a plurality of wing compression rods 138 inserted and coupled into the guide compression holes 117 and 127,
When the preliminary block is pressed by the first, second, and third compression units, the wing crimping bar 138 of the third crimping unit 132 is interdigitated into the guide crimping holes 117 and 127 of the first and second crimping units, A method of manufacturing a heat dissipation sheet, characterized in that the preliminary block is press-compressed by the 1, 2, and 3 crimping bands.
The method of claim 8 ;
The first crimping base 112 has support protrusions 119 protruding from both sides of the rear bottom of the lower crimping unit 115,
Between the rod 114 and the first crimping base 112 of the first cylinder of the first compression unit 110 , and the rod 124 and the second crimping unit 122 of the second cylinder of the second compression unit 120 . ) between the first and second horizontal supports 118 and 128 are installed, respectively,
A method of manufacturing a heat dissipation sheet, characterized in that both ends of the compression band 129 are formed with a plurality of free holes 129a.
The method of claim 1 ;
Before the heat dissipation sheet forming step or after the heat dissipation sheet forming step, one surface of the sheet block 40 or the heat dissipation sheet 50 is surface treated with sandpaper to form a plate or fibrous thermal conductive filler 11 into the sheet block 40 or heat dissipation sheet (50) Heat dissipation sheet manufacturing method, characterized in that it further comprises a surface treatment step to be exposed on the surface.

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