JP2008266659A5

JP2008266659A5 -

Info

Publication number: JP2008266659A5
Application number: JP2008207202A
Authority: JP
Filing date: 2008-08-11
Publication date: 2010-05-20
Anticipated expiration: 2025-01-14

Description

本発明者らは、上記課題に鑑み鋭意検討を行ったところ、ベースポリマーとして熱可塑性エラストマーを必須成分とし、所定量の熱伝導性フィラーを配合することにより、十分な放熱性能を長期にわたり発揮でき、その上、非架橋でも弾性と柔軟性が得られることを見いだし、この知見に基づき本発明をなすに至った。
すなわち、本発明は、
（Ａ）、熱可塑性エラストマー１００質量部に対し、粘度比重定数（ＶＧＣ）０．８４９以下であるパラフィン系オイル１００〜５００質量部、球状アルミナ１２００〜５０００質量部、および金属水和物として水酸化アルミニウム又は水酸化マグネシウムを３００〜３０００質量部を含有し、熱可塑性エラストマー１００質量部に対して、前記球状アルミナと前記金属水和物の合計が１５００〜８０００質量部であり、前記熱可塑性エラストマーがオレフィン系熱可塑性エラストマーまたはスチレン系熱可塑性エラストマーであることを特徴とする非架橋樹脂組成物、
（Ｂ）、前記熱可塑性エラストマーが二重結合を含まないＳＥＢＳ、ＳＥＰＳおよびＳＥＥＰＳからなる群より選ばれる少なくとも１種の熱可塑性エラストマーまたはこれらの混合物であることを特徴とする（Ａ）に記載の非架橋樹脂組成物、
（Ｃ）、ＳＲＩＳ（日本ゴム協会規格）０１０１規定のアスカーＣ型硬度計の測定値で、硬度が７０以下の範囲にあり、熱伝導率が１Ｗ／ｍ・Ｋ以上であり、熱抵抗が０．６５℃／Ｗ以下であり、シートを圧縮試験機で０．５ｍｍ／分の速度で２ｍｍから１ｍｍまで圧縮したときの１０分経過後の力の比較した保持率が５０％以上であることを特徴とする（Ａ）または（Ｂ）に記載の非架橋樹脂組成物からなる熱伝導成形体。
（Ｄ）、（Ａ）または（Ｂ）に記載の非架橋樹脂組成物を成形してなる、ブリードとシロキサンの発生がない熱伝導性成形体、
（Ｅ）、熱可塑性エラストマー１００質量部に対し、粘度比重定数（ＶＧＣ）０．８４９以下であるパラフィン系オイル１００〜５００質量部、アルミナ１２００〜５０００質量部、および金属水和物として水酸化アルミニウム又は水酸化マグネシウムを３００〜３０００質量部を混合して非架橋樹脂組成物を得る混合工程と、ロールで、前記非架橋樹脂組成物を成形して熱伝導性成形体を得る成形工程とを備える、熱伝導性成形体の製造方法、
を提供するものである。 As a result of intensive studies in view of the above problems, the present inventors have been able to demonstrate sufficient heat dissipation performance over a long period of time by using a thermoplastic elastomer as an essential component as a base polymer and blending a predetermined amount of a thermally conductive filler. Moreover, it has been found that elasticity and flexibility can be obtained even with non-crosslinking, and the present invention has been made based on this finding.
That is, the present invention
(A), 100 to 500 parts by mass of paraffinic oil having a viscosity specific gravity constant (VGC) of 0.849 or less, 1200 to 5000 parts by mass of spherical alumina, and hydroxylated as a metal hydrate with respect to 100 parts by mass of the thermoplastic elastomer 300 to 3000 parts by weight of aluminum or magnesium hydroxide is contained, and the total of the spherical alumina and the metal hydrate is 1500 to 8000 parts by weight with respect to 100 parts by weight of the thermoplastic elastomer, and the thermoplastic elastomer is A non-crosslinked resin composition, which is an olefin-based thermoplastic elastomer or a styrene-based thermoplastic elastomer,
(B), wherein the thermoplastic elastomer is at least one thermoplastic elastomer selected from the group consisting of SEBS, SEPS, and SEEPS not containing a double bond, or a mixture thereof. Non-crosslinked resin composition,
(C), measured value of Asker C type hardness tester of SRIS (Japan Rubber Association Standard) 0101 standard, hardness is in the range of 70 or less , thermal conductivity is 1 W / m · K or more, and thermal resistance is 0 .65 ° C./W or less, and the retention ratio of the force after 10 minutes when the sheet is compressed from 2 mm to 1 mm at a speed of 0.5 mm / min with a compression tester is 50% or more. A heat conductive molded article comprising the non-crosslinked resin composition according to (A) or (B).
(D), a thermally conductive molded article formed by molding the non-crosslinked resin composition according to (A) or (B) and free from bleeding and siloxane;
(E) 100 to 500 parts by weight of paraffinic oil having a viscosity specific gravity constant (VGC) of 0.849 or less, 1200 to 5000 parts by weight of alumina, and aluminum hydroxide as a metal hydrate with respect to 100 parts by weight of the thermoplastic elastomer Or the mixing process which mixes 300-3000 mass parts of magnesium hydroxide and obtains a non-crosslinked resin composition, and the shaping | molding process which shape | molds the said non-crosslinked resin composition with a roll, and obtains a heat conductive molded object are provided. , Manufacturing method of heat conductive molded body,
Is to provide.

Claims

100 to 500 parts by weight of paraffinic oil having a viscosity specific gravity constant (VGC) of 0.849 or less, 1200 to 5000 parts by weight of spherical alumina, and aluminum hydride or hydroxide as a metal hydrate with respect to 100 parts by weight of the thermoplastic elastomer Containing 300 to 3000 parts by weight of magnesium,
The total of the spherical alumina and the metal hydrate is 1500 to 8000 parts by mass with respect to 100 parts by mass of the thermoplastic elastomer,
The non-crosslinked resin composition, wherein the thermoplastic elastomer is an olefin-based thermoplastic elastomer or a styrene-based thermoplastic elastomer.

2. The non-crosslinked resin composition according to claim 1, wherein the thermoplastic elastomer is at least one thermoplastic elastomer selected from the group consisting of SEBS, SEPS and SEEPS not containing a double bond, or a mixture thereof. object.

The measured value of Asker C type hardness tester of SRIS (Japan Rubber Association Standard) 0101, the hardness is in the range of 70 or less
The thermal conductivity is 1 W / m · K or more,
The thermal resistance is 0.65 ° C./W or less,
2. The retention ratio of the force after 10 minutes when the sheet is compressed from 2 mm to 1 mm at a speed of 0.5 mm / min with a compression tester is 50% or more. A heat conductive molded body comprising the non-crosslinked resin composition according to 2.

A thermally conductive molded article formed by molding the non-crosslinked resin composition according to claim 1 or 2 and free from bleeding and siloxane.

100-500 parts by weight of paraffinic oil having a viscosity specific gravity constant (VGC) of 0.849 or less, 1200-5000 parts by weight of alumina, and aluminum hydroxide or magnesium hydroxide as a metal hydrate with respect to 100 parts by weight of the thermoplastic elastomer Mixing step of mixing 300 to 3000 parts by mass to obtain a non-crosslinked resin composition;
And a molding step of forming the non-crosslinked resin composition with a roll to obtain a thermally conductive molded body.