WO2017135237A1 - 熱伝導性樹脂成型品 - Google Patents
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- WO2017135237A1 WO2017135237A1 PCT/JP2017/003366 JP2017003366W WO2017135237A1 WO 2017135237 A1 WO2017135237 A1 WO 2017135237A1 JP 2017003366 W JP2017003366 W JP 2017003366W WO 2017135237 A1 WO2017135237 A1 WO 2017135237A1
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Definitions
- the present invention relates to a thermally conductive resin molded article, and more specifically to a thermally conductive resin molded article having excellent thermal conductivity in the thickness direction, which can be mass-produced at low cost.
- Patent Document 1 Japanese Patent Application Laid-Open No. 05-102355
- a heat conductive sheet comprising a matrix component containing a heat conductive filler whose surface is coated with a coupling agent, the heat conductive filler
- An anisotropic heat conductive sheet in which is oriented and distributed in the thickness direction is disclosed.
- Patent Document 2 Japanese Patent Laid-Open No. 2003-174127
- a heat conductive fiber obtained by coating an electrically insulating material on the surface of a conductive heat conductive fiber is arranged in the thickness direction of a sheet made of an organic polymer.
- An anisotropic heat transfer sheet characterized by being oriented by electrostatic flocking is disclosed.
- thermally conductive filler that can be used and the volume filling rate thereof are limited, so that the obtained thermal conductivity is not sufficient, and the heat dissipation characteristics required for various electronic devices are completely satisfied. There was no problem.
- the object of the present invention is to reduce the internal thermal resistance by high filling and reduce the interfacial thermal resistance by improving cutting accuracy, which can be mass-produced at low cost.
- An object of the present invention is to provide a thermally conductive resin molded product that exhibits a resistance value.
- the present inventor used a heat conductive filler having an average particle size different in size.
- the inventors have found that it is effective to align the aspect ratio of the heat conductive filler having an average particle diameter within a specific range and substantially in the thickness direction, and have reached the present invention.
- a thermally conductive filler comprising a resin and a second thermally conductive filler having a particle size smaller than the first thermally conductive filler and the first thermally conductive filler;
- the first thermally conductive filler has an aspect ratio of 10 or more and is oriented in a substantially thickness direction of the thermally conductive resin molded product,
- the resin is a silicone resin, acrylic rubber or fluororubber;
- the second thermally conductive filler has a thermal conductivity greater than 5 W / mK;
- a thermally conductive resin molded product characterized by the above is provided.
- the volume filling rate of the heat conductive filler in the heat conductive resin molded product is preferably 10 to 80% by volume, and more preferably 40 to 60% by volume.
- the weld line of the resin is formed in a substantially thickness direction of the thermally conductive resin molded product.
- the weld line is formed in the substantially thickness direction of the thermally conductive molded product means that the thermally conductive molded product is formed of a number of resin molded products that are folded and welded in the vertical direction. Means.
- the weld line is not necessarily a complete straight line, and may be curved in an arc shape, or may be partially discontinuous.
- the “thermally conductive resin molded product” in the present invention is any of a block-like product after extrusion molding or a cut product (including a sliced sheet-like product) obtained by appropriately cutting the block-like product. It is a concept that includes. Further, the “particle size” of the thermally conductive filler is a concept of an average particle size in the particle size distribution measurement, and is measured by a method called laser diffraction scattering method.
- a thermally conductive resin molded product that can be mass-produced at low cost and that exhibits low thermal resistance by reducing internal thermal resistance by high filling and reducing interfacial thermal resistance by improving cut accuracy. Can be provided.
- thermally conductive resin molded product of the present invention will be described in detail with reference to the drawings, but the present invention is not limited thereto.
- the same or corresponding parts are denoted by the same reference numerals, and redundant description may be omitted.
- drawings are for conceptually explaining the present invention, the dimensions and ratios of the components shown may be different from the actual ones.
- the thermally conductive resin sheet of the present embodiment includes a resin and a thermally conductive filler including a first thermally conductive filler and a second thermally conductive filler having a particle size smaller than the first thermally conductive filler.
- the first thermally conductive filler has an aspect ratio of 10 or more and is oriented in a substantially thickness direction of the thermally conductive resin sheet, and the resin is silicone resin, acrylic rubber or fluororubber.
- the thermally conductive resin sheet of the present embodiment includes a first thermally conductive filler, a second thermally conductive filler having a particle size smaller than the first thermally conductive filler, and a thermally conductive filler. That is, the particle size D 1 of the first thermally conductive filler, and the particle diameter D 2 of the second thermally conductive filler, have a relationship of D 1> D 2.
- FIG. 1 is a conceptual diagram for explaining the manufacturing method of the heat conductive resin sheet of the present embodiment, and shows a schematic cross-sectional view of a tip portion of an extruder and a T die.
- the T-die of the extruder has at least one of a first gap in a continuous vertical gap X, a second gap in a vertical gap Y, and an upper and lower side surface of a flow path between the first gap and the second gap. Have an inclined surface.
- the resin composition containing the thermally conductive filler is stirred and kneaded by the screw 2 and introduced into the first gap 4 (gap X) along the flow path 8.
- the flow of the resin composition is squeezed in the vertical direction (thickness direction) with respect to the flow direction in the extruder by the first gap 4 to form a thin strip shape.
- a shearing force acts on the resin composition, and the thermally conductive filler mixed in the resin is oriented in the flow direction of the resin composition.
- the heat conductive filler is oriented in the surface direction of the heat conductive resin sheet precursor.
- the gap of the first gap 4 may be adjusted as appropriate, for example, 0.5 mm or more and 5.0 mm or less.
- the gap of the first gap 4 is smaller than 0.5 mm, not only the extrusion pressure rises unnecessarily but also the resin composition is clogged.
- the gap of the first gap 4 is larger than 5.0 mm, the degree of orientation of the heat conductive filler with respect to the surface direction of the heat conductive resin sheet precursor is reduced.
- the cross-sectional area of the flow path 8 is increased, and the length in the vertical direction is increased. Therefore, the flow of the resin molded product precursor changes in the vertical direction. Subsequently, the resin sheet precursor is folded in a direction substantially perpendicular to the direction of the flow in the first gap 4 on the downstream side of the first gap 4 (in the flow path having the inclined surface), thereby forming a belt-shaped resin.
- the molded product precursor is mixed and fused, and is continuously extruded from the tip of the second gap 6 in a converged and integrated state, whereby the thermally conductive resin molded product (block-shaped product) of the present invention is obtained.
- the heat conductive filler is oriented in a substantially thickness direction of the heat conductive resin molded product (block-shaped product).
- thermally conductive molded product (block-like product) subjected to the crosslinking treatment is sliced in a direction perpendicular to the orientation direction of the thermally conductive filler to obtain a uniform thickness.
- a thermally conductive resin molded product (sheet) is manufactured.
- the gap Y of the second gap 6 is preferably not less than 2 times and not more than 40 times the gap X of the first gap 4.
- the upper and lower side surfaces of the flow path between the first gap 4 and the second gap 6 are inclined surfaces so that the pressure loss is small, and the thermally conductive filler is efficiently used in the thickness direction of the resin sheet. It is desirable to adjust the tilt angle for orientation.
- the inclination angle can be, for example, 10 ° to 50 °, and more preferably 20 ° to 30 °.
- the resin constituting the thermally conductive resin molded product of the present embodiment functions as a matrix or a binder.
- silicone resin silicone rubber and silicone gel
- urethane rubber acrylic rubber, butyl rubber, An ethylene propylene copolymer, an ethylene vinyl acetate copolymer, etc.
- silicone resins are particularly suitable because they are excellent in flexibility, shape followability, adhesion to a heat generating surface when brought into contact with an electronic component, and heat resistance.
- Silicone resins include silicone gels and silicone rubbers, which are roughly classified according to the number of crosslinking points being small / large or the difference in crosslinking species (addition reaction: platinum-based catalyst, condensation reaction: peroxide).
- Examples of the silicone rubber include millable silicone and addition reaction silicone.
- Silicone gel is more preferred because it has fewer crosslinking points and can be filled with more thermally conductive filler into silicone rubber. Note that silicone rubber is superior from the viewpoint of excellent heat resistance and electrical insulation due to a small number of crosslinking points.
- thermally conductive filler including the first thermally conductive filler and the second thermally conductive filler
- various conventionally known materials can be used as long as the effects of the present invention are not impaired.
- boron nitride (BN) graphite
- carbon fiber mica, alumina, aluminum nitride
- Silicon carbide silica, zinc oxide, magnesium oxide, calcium carbonate, magnesium carbonate, molybdenum disulfide, copper, aluminum and the like.
- the shape of the thermally conductive filler is not particularly limited and may be appropriately selected depending on the intended purpose.For example, scale-like, plate-like, film-like, massive, cylindrical, prismatic, elliptical, flat shape, etc. Can be mentioned.
- the second thermally conductive filler having a small particle size is easily dispersed in the gap between the first thermally conductive filler having a large particle size to form a heat conduction path, and the first thermally conductive filler is easily oriented in the resin. From this viewpoint, it is preferable that the aspect ratio of the first thermally conductive filler is 10 or more.
- the thermal conductivity of the second thermal conductive filler with a small particle size is achieved.
- the rate is preferably greater than 5 W / mK.
- the upper limit of the thermal conductivity ⁇ of the second thermal conductive filler may be 200 W / mK.
- the thermal conductivity is measured by a method called a laser flash method.
- Examples of the material used for the second thermally conductive filler include boron nitride (BN), aluminum nitride, silicon carbide, alumina, magnesium oxide, magnesium carbonate, and calcium carbonate.
- the proportion of the thermally conductive filler can be 10 to 80% by volume, and is appropriately determined according to the required thermal conductivity and the like. be able to.
- the proportion of the heat conductive filler is less than 10% by volume, the heat conduction effect is reduced.
- the proportion of the heat conductive filler exceeds 80% by volume, the heat conductive resin sheet precursor is folded in a direction substantially perpendicular to the flow direction in the first gap when passing through the first gap. This causes a problem that it becomes difficult to fuse the resin.
- the volume of the composition as the precursor is 100% by volume
- the mixing ratio of the first heat conductive filler and the second heat conductive filler in the heat conductive filler does not impair the effects of the present invention. It can be determined appropriately within a range.
- the first heat conductive filler may be 40 to 60% by volume and the second heat conductive filler may be 2 to 20% by volume
- the thermally conductive resin molded article of the present invention includes a reinforcing agent, a filler, a softener, a crosslinking agent, a crosslinking accelerator, a crosslinking accelerator, an antiaging agent, an adhesive, in addition to the resin and the thermally conductive filler described above.
- General blending / additives such as an imparting agent, an antistatic agent, and a kneading adhesive can be arbitrarily selected.
- Example 1 In the formulation shown in Table 1, a crosslinking agent and a thermally conductive filler were kneaded with two rolls into the silicone resin component to obtain a ribbon sheet (composition as a precursor).
- silicone resin component “silicone rubber DY32 1005U” manufactured by Toray Dow Corning Co., Ltd., a flame retardant component and a plasticizer component are used, and as the heat conductive filler, “PT110” (plate-like boron nitride manufactured by Momentive) is used.
- Average particle size 45 ⁇ m) and “DAW-03” alumina, average particle size 3 ⁇ m) manufactured by Denka Co., Ltd. were used.
- crosslinking agent “RC-4” and “MR-53” manufactured by Toray Dow Corning Co., Ltd. are used, and as the flame retardant component, those containing a metal compound such as iron oxide are preferable, manufactured by Momentive. “ME-41F” and “XC87-905” were used.
- plasticizer component a silicone oil having the same skeleton as the silicone rubber and requiring a viscosity of 100 cs to 10,000 cs is preferable, and “KF-96-3000CS” manufactured by Shin-Etsu Chemical Co., Ltd. was used.
- the ribbon sheet obtained as described above was used in a short axis extruder for rubber shown in FIG. 1 by using a vertical alignment mold (die) having a first gap of 1 mm and a second gap of 10 mm.
- a 10 mm thick thermally conductive resin molded article (block-like product) in which plate-like boron nitride was oriented in the thickness direction was produced, and the block-like product was subjected to a crosslinking treatment at 170 ° C. for 30 minutes.
- the block-like product after the crosslinking treatment was sliced perpendicularly to the thickness direction to produce a thermally conductive resin molded product (sheet) 1 having a thickness of 500 ⁇ m.
- the above cut accuracy is evaluated by the ratio of the thermal resistance value at the measurement pressure of 500 kPa to the thermal resistance value at the time of 100 kPa (thermal resistance value at the time of 100 kPa measurement / thermal resistance value at the time of 500 kPa measurement) and less than 1.9
- the case of ⁇ the case of 1.9 or more and less than 2.3 was evaluated as ⁇ , and the case of 2.3 or more was evaluated as ⁇ .
- Table 1 The results are shown in Table 1.
- Example 2 >> Example 1 except that “XGP” (plate boron nitride, average particle size 35 ⁇ m) and “DAW-03” (alumina, average particle size 3 ⁇ m) manufactured by Denka Co., Ltd. were used as the thermally conductive filler. The heat conductive resin sheet 2 was produced and evaluated. The results are shown in Table 1.
- Example 3 Except that “SGPS” (bulk boron nitride, average particle size 12 ⁇ m) and “DAW-03” (alumina, average particle size 3 ⁇ m) manufactured by Denka Co., Ltd. were used as the heat conductive filler, the same as in Example 1. Thus, a heat conductive resin sheet 2 was produced and evaluated. The results are shown in Table 1.
- Example 4 Example 1 except that “XGP” (plate boron nitride, average particle size 35 ⁇ m) and “SGPS” (block boron nitride, average particle size 12 ⁇ m) manufactured by Denka Co., Ltd. were used as the thermally conductive filler.
- the heat conductive resin sheet 2 was produced and evaluated. The results are shown in Table 1.
- Example 5 “XGP” (plate boron nitride, average particle size 35 ⁇ m), “SGPS” (bulk boron nitride, average particle size 12 ⁇ m) and “DAW-03” (alumina, average particle size) manufactured by Denka Co., Ltd. as heat conductive fillers A thermally conductive resin sheet 2 was produced and evaluated in the same manner as in Example 1 except that 3 ⁇ m in diameter was used. The results are shown in Table 1.
- Example 1 A comparative heat conductive resin sheet 1 was prepared in the same manner as in Example 1 except that only “XGP” (plate-like boron nitride, average particle size 35 ⁇ m) manufactured by Denka Co., Ltd. was used as the heat conductive filler. Evaluation was performed. The results are shown in Table 1.
- Example 2 A comparative heat conductive resin sheet 2 was produced in the same manner as in Example 1 except that only “XGP” (plate-like boron nitride, average particle size 35 ⁇ m) manufactured by Denka Co., Ltd. was used as the heat conductive filler. Evaluation was performed. The results are shown in Table 1.
- Comparative Example 4 In the formulation shown in Table 1, the silicone resin component was kneaded with a crosslinking agent and a thermally conductive filler with two rolls to obtain a sheet having a thickness of 2 mm. Silicone rubber “DY32 1005U” manufactured by Toray Dow Corning Co., Ltd. as a silicone resin component, a flame retardant component and a plasticizer component, and “XGP” (plate boron nitride manufactured by Denka Co., Ltd.) as a thermally conductive filler Average particle size 35 ⁇ m) and “DAW-03” (alumina, average particle size 3 ⁇ m) were used. As the crosslinking agent, “RC-4” and “MR-53” manufactured by Toray Dow Corning Co., Ltd.
- the flame retardant component preferably contains a metal compound such as iron oxide.
- a metal compound such as iron oxide.
- ME-41F and “XC87-905” were used.
- the plasticizer component a silicone oil having the same skeleton as the silicone rubber and requiring a viscosity of 100 cs to 10,000 cs is preferable, and “KF-96-3000CS” manufactured by Shin-Etsu Chemical Co., Ltd. was used.
- Comparative Example 5 >> “XGP” manufactured by Denka Co., Ltd. (plate-like boron nitride, average particle size of 35 ⁇ m) and “Silicia 740” manufactured by Fuji Silysia Chemical Co., Ltd. (fine powder silica, average particle size of 5 ⁇ m) are used as thermally conductive fillers.
- a comparative heat conductive resin sheet 5 was produced and evaluated in the same manner as in Example 1 except for the above. The results are shown in Table 1.
- thermoly conductive resin sheet exhibiting a low thermal resistance value is obtained by reducing the internal thermal resistance by high filling and reducing the interfacial thermal resistance by improving cut accuracy.
Abstract
Description
樹脂と、第一熱伝導性フィラー及び前記第一熱伝導性フィラーより小さい粒径を有する第二熱伝導性フィラーを含む熱伝導性フィラーと、を含み、
前記第一熱伝導性フィラーが10以上のアスペクト比を有するとともに前記熱伝導性樹脂成形品の略厚み方向に配向しており、
前記樹脂がシリコーン樹脂、アクリルゴム又はフッ素ゴムであり、
前記第二熱伝導性フィラーが5W/mK超の熱伝導率を有すること、
を特徴とする熱伝導性樹脂成形品を提供する。
表1に記載の配合にて、シリコーン樹脂成分に架橋剤及び熱伝導性フィラーを2本ロールで練り込み、リボンシート(前駆体としての組成物)を得た。シリコーン樹脂成分としては、東レダウコーニング(株)製の「シリコーンゴムDY32 1005U」、難燃剤成分及び可塑剤成分を用い、熱伝導性フィラーとしては、Momenntive社製の「PT110」(板状窒化ホウ素、平均粒径45μm)及びデンカ(株)製の「DAW‐03」(アルミナ、平均粒径3μm)を用いた。また、架橋剤としては、東レダウコーング(株)製の「RC-4」及び「MR‐53」を用い、難燃剤成分としては、酸化鉄等の金属化合物を含有したものが好ましく、Momenntive社製の「ME-41F」及び「XC87‐905」を用いた。可塑剤成分としては、シリコーンゴムと同骨格を有し、100csから10000csの粘度を要するシリコーンオイルが好ましく、信越化学工業(株)製の「KF-96-3000CS」を用いた。
(1)熱抵抗
得られた熱伝導性樹脂シートの厚さ方向の熱抵抗をTIM TESTER1300を用いて2水準の測定圧力で計測し、計測された値を表1に示した。なお、当該測定は定常法にて米国規格ASTM D5470に準拠した。
(2)カット精度
上記のスライス加工時のカット精度は、熱抵抗値に影響を与える。カット精度が悪い場合は、接触界面の熱抵抗が増加し、それに伴い熱抵抗測定時の圧力依存性が強まる。例えば、低い圧力の場合は接触界面の熱抵抗が高いが、高い圧力の場合は、シートが圧縮されることにより接触界面の熱抵抗が小さくなる。
上述のカット精度を測定時圧力500kPa時の熱抵抗値と100kPa時の熱抵抗値との比(100kPa測定時の熱抵抗値/500kPa測定時の熱抵抗値)にて評価し、1.9未満の場合を〇、1.9以上2.3未満の場合を△、2.3以上の場合を×と評価した。結果を表1に示した。
熱伝導性フィラーとしてデンカ(株)製の「XGP」(板状窒化ホウ素、平均粒径35μm)及び「DAW‐03」(アルミナ、平均粒径3μm)を用いた以外は、実施例1と同様にして熱伝導性樹脂シート2を作製し、評価を行った。結果を表1に示した。
熱伝導性フィラーとしてデンカ(株)製の「SGPS」(塊状窒化ホウ素、平均粒径12μm)及び「DAW‐03」(アルミナ、平均粒径3μm)を用いた以外は、実施例1と同様にして熱伝導性樹脂シート2を作製し、評価を行った。結果を表1に示した。
熱伝導性フィラーとしてデンカ(株)製の「XGP」(板状窒化ホウ素、平均粒径35μm)及び「SGPS」(塊状窒化ホウ素、平均粒径12μm)を用いた以外は、実施例1と同様にして熱伝導性樹脂シート2を作製し、評価を行った。結果を表1に示した。
熱伝導性フィラーとしてデンカ(株)製の「XGP」(板状窒化ホウ素、平均粒径35μm)、「SGPS」(塊状窒化ホウ素、平均粒径12μm)及び「DAW‐03」(アルミナ、平均粒径3μm)を用いた以外は、実施例1と同様にして熱伝導性樹脂シート2を作製し、評価を行った。結果を表1に示した。
熱伝導性フィラーとしてデンカ(株)製の「XGP」(板状窒化ホウ素、平均粒径35μm)のみを用いた以外は、実施例1と同様にして比較熱伝導性樹脂シート1を作製し、評価を行った。結果を表1に示した。
熱伝導性フィラーとしてデンカ(株)製の「XGP」(板状窒化ホウ素、平均粒径35μm)のみを用いた以外は、実施例1と同様にして比較熱伝導性樹脂シート2を作製し、評価を行った。結果を表1に示した。
熱伝導性フィラーとしてデンカ(株)製の「HGP」(板状窒化ホウ素、平均粒径5μm)及びデンカ(株)製の「DAW‐03」(アルミナ、平均粒径3μm)を用いた以外は、実施例1と同様にして比較熱伝導性樹脂シート3を作製し、評価を行った。結果を表1に示した。
表1に記載の配合にて、シリコーン樹脂成分に架橋剤及び熱伝導性フィラーを2本ロールで練り込み、厚さ2mmのシートを得た。シリコーン樹脂成分として、東レダウコーニング(株)製のシリコーンゴム「DY32 1005U」、難燃剤成分及び可塑剤成分を用い、熱伝導性フィラーとしてデンカ(株)製の「XGP」(板状窒化ホウ素、平均粒径35μm)及び「DAW‐03」(アルミナ、平均粒径3μm)を用いた。架橋剤としては、東レダウコーング(株)製の「RC-4」及び「MR‐53」を用い、難燃剤成分としては、酸化鉄等の金属化合物を含有したものが好ましく、Momenntive社製の「ME-41F」及び「XC87‐905」を用いた。可塑剤成分としては、シリコーンゴムと同骨格を有し、100csから10000csの粘度を要するシリコーンオイルが好ましく、信越化学工業(株)製の「KF-96-3000CS」を用いた。
熱伝導性フィラーとしてデンカ(株)製の「XGP」(板状窒化ホウ素、平均粒径35μm)及び富士シリシア化学(株)製の「サイリシア740」(微粉末シリカ、平均粒径5μm)を用いた以外は実施例1と同様にして比較熱伝導性樹脂シート5を作製し、評価を行った。結果を表1に示した。
4・・・第一ギャップ、
6・・・第二ギャップ、
8・・・流路。
Claims (2)
- 樹脂と、第一熱伝導性フィラー及び前記第一熱伝導性フィラーより小さい粒径を有する第二熱伝導性フィラーを含む熱伝導性フィラーと、を含み、
前記第一熱伝導性フィラーが10以上のアスペクト比を有するとともに前記熱伝導性樹脂成形品の略厚み方向に配向しており、
前記樹脂がシリコーン樹脂、アクリルゴム又はフッ素ゴムであり、
前記第二熱伝導性フィラーが5W/mK超の熱伝導率を有すること、
を特徴とする熱伝導性樹脂成形品。 - 前記樹脂のウェルドラインが前記熱伝導性樹脂成型品の略厚み方向に形成されていること、
を特徴とする請求項1に記載の熱伝導性樹脂成形品。
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