JPH08188407A - Filler material - Google Patents
Filler materialInfo
- Publication number
- JPH08188407A JPH08188407A JP7002627A JP262795A JPH08188407A JP H08188407 A JPH08188407 A JP H08188407A JP 7002627 A JP7002627 A JP 7002627A JP 262795 A JP262795 A JP 262795A JP H08188407 A JPH08188407 A JP H08188407A
- Authority
- JP
- Japan
- Prior art keywords
- expanded graphite
- filler material
- molded product
- grinding
- graphite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Carbon And Carbon Compounds (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、プラスチックや無機材
料に配合して、導電性、熱伝導性、摺動性等を得るため
に好適なフィラー材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filler material suitable for being mixed with a plastic or an inorganic material to obtain electrical conductivity, thermal conductivity, slidability and the like.
【０００２】[0002]
【従来の技術】黒鉛は、炭素の六員環の結晶構造が平面
方向に発達した材料であり、所謂炭素材料の中では最も
導電性、熱伝導性、摺動性等に優れ、加えて良好な耐熱
性及び耐薬品性を有する材料である。黒鉛はその粉末を
成形した形態で、これらの優れた特性を利用して、モー
タ用ブラシ、軸受、シール材、金属蒸着用るつぼ等の各
種の摺動材料や耐熱構造部品として利用されている。し
かし、黒鉛の粉末が、その優れた導電性や熱伝導性を利
用して、異種の材料へこれらの特性を付与するための充
填材（フィラー材）として使用されるケースは少ない。
導電性や熱伝導性を付与するたの炭素材料としては、一
般的にカーボンブラックが使用されているのが現状であ
る。2. Description of the Related Art Graphite is a material in which a crystal structure of a carbon six-membered ring is developed in a plane direction, and is the most excellent among the so-called carbon materials in terms of electrical conductivity, thermal conductivity, slidability, and the like. It is a material with excellent heat resistance and chemical resistance. Graphite, in the form of its powder, is used as a variety of sliding materials such as motor brushes, bearings, sealing materials, crucibles for metal deposition, and heat-resistant structural parts by utilizing these excellent characteristics. However, there are few cases where graphite powder is used as a filler (filler material) for imparting these characteristics to different materials by utilizing its excellent electrical conductivity and thermal conductivity.
At present, carbon black is generally used as a carbon material for imparting electrical conductivity and thermal conductivity.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、カーボ
ンブラックは粉末そのものの導電性、熱伝導性、摺動性
等は黒鉛に及ばない。また、カーボンブラックは、通常
は石油等の炭化水素を還元系で不完全燃焼させて製造す
るため、表面に有機質の不純物が多く残存しており、凝
集性や付着性が大きく、従って取扱い性が悪い。更に、
カーボンブラックは、微粒子の一次粒子が網目状に発達
した二次粒子形状をとるものが多いが、相手材に配合す
る際、その配合条件の違いにより、有効な特性付与の原
因となる網目構造が分断され、得られる特性の変化が大
きくなる、即ち取扱い性の悪い材料であると云える。However, the electric conductivity, thermal conductivity, slidability, and the like of the powder itself of carbon black are less than those of graphite. In addition, since carbon black is usually produced by incompletely burning hydrocarbons such as petroleum in a reducing system, a large amount of organic impurities remain on the surface, and the cohesiveness and adhesiveness are large, and therefore the handling is easy. bad. Furthermore,
Carbon black often takes the form of secondary particles in which primary particles of fine particles have developed in a mesh shape, but when compounded in a mating material, due to the difference in the compounding conditions, the mesh structure that causes effective properties is It can be said that it is a material that is divided and has a large change in the obtained characteristics, that is, has poor handleability.
【０００４】特開昭５２−５９６４５号公報には、膨張
黒鉛をゴム中に分散させて導電性を向上させた導電性ゴ
ム組成物が示されている。しかし、膨張黒鉛は通常粒径
が数ミリ程度と大きく、これを相手材中に分散させて導
電性を向上させるために微粉化するには嵩密度が０．０
１ｇ/cm3程度と小さいため、粉砕効率が悪いという問題
点がある。また、通常の天然産鱗状黒鉛も薄片性が大き
く、滑り易いために粉砕効率が悪く、また、相手材への
分散性が悪く、導電性がそれほど向上しない。本発明
は、上記した問題点を解決し、黒鉛でもカーボンブラッ
クと同等以上の特性付与効果を得ることが出来るフィラ
ー材を提供するものである。Japanese Unexamined Patent Publication (Kokai) No. 52-59645 discloses a conductive rubber composition in which expanded graphite is dispersed in rubber to improve its conductivity. However, expanded graphite usually has a large particle size of about several millimeters, and has a bulk density of 0.0 to be finely divided in order to disperse the expanded graphite in a partner material and improve conductivity.
Since it is as small as about 1 g / cm 3, there is a problem that grinding efficiency is poor. Further, ordinary natural scaly graphite also has a large flaky property and is slippery, so that the pulverization efficiency is poor, and the dispersibility in the mating material is poor, and the electrical conductivity is not so improved. The present invention provides a filler material that solves the above-mentioned problems and that graphite can obtain a property imparting effect equivalent to or higher than that of carbon black.
【０００５】[0005]
【課題を解決するための手段】本発明は、膨張黒鉛成形
体を粉砕し、粒径を１０００μｍ以下及び嵩密度を０．
５ｇ/cm3以下としたフィラー材に関する。本発明では、
膨張黒鉛を成形した膨張黒鉛成形体を用いることによ
り、粉砕効率を向上させ、微粉化を容易にする。使用す
る膨張黒鉛は公知の方法により得られるもので、例えば
天然黒鉛、キッシュ黒鉛等の結晶の発達した黒鉛を酸化
剤の存在下で濃硫酸と反応させて得た黒鉛層間化合物を
１０００℃以上の高温で加熱して得たものが用いられ
る。粉砕前の膨張黒鉛成形体は密度が０．０５〜１．８
ｇ/cm3の範囲のものであれば、強度、粉砕効率、嵩密度
等の点で好ましい。膨張黒鉛を成形する方法については
特に制限はなく公知の方法で行われ、例えばロール、プ
レス等を用いて膨張黒鉛を成形体とすることができる。According to the present invention, an expanded graphite compact is crushed to have a particle size of 1000 μm or less and a bulk density of 0.
The present invention relates to a filler material having a content of 5 g / cm 3 or less. In the present invention,
By using an expanded graphite molded body obtained by molding expanded graphite, pulverization efficiency is improved and pulverization is facilitated. The expanded graphite used is obtained by a known method. For example, a graphite intercalation compound obtained by reacting graphite with developed crystals such as natural graphite and Kish graphite with concentrated sulfuric acid in the presence of an oxidizing agent is used at 1000 ° C. or higher. What was obtained by heating at a high temperature is used. The density of the expanded graphite compact before pulverization is 0.05 to 1.8.
The range of g / cm 3 is preferable in terms of strength, crushing efficiency, bulk density and the like. The method for molding the expanded graphite is not particularly limited and may be a known method. For example, the expanded graphite can be formed into a molded product by using a roll, a press or the like.
【０００６】膨張黒鉛成形体を粉砕する方法は、特に制
限はないが、衝撃式の粉砕方式が好ましい。本発明では
粉砕後の粉末の粒度を１０００μｍ以下とし、更に嵩密
度を０．５ｇ/cm3以下とされる。粉末の粒度が１０００
μｍを越えると、プラスチックや無機材料に添加した
際、表面外観に粒子の残影を生じさせ易い。粒度の下限
は特に制限しないが０．５μｍが好ましい。一方粉末の
嵩密度が０．５ｇ/cm3を越えると一般の天然黒鉛と同程
度となり、目的とする特性付与の効果は得られない。膨
張黒鉛成形体を粉砕した粉体の粒径を１０００μｍ以下
及び嵩密度を０．５ｇ/cm3とするには、膨張黒鉛成形体
を例えば衝撃式粉砕機で粉砕することにより達成でき
る。The method of crushing the expanded graphite compact is not particularly limited, but an impact crushing method is preferable. In the present invention, the particle size of the powder after pulverization is 1000 μm or less, and the bulk density is 0.5 g / cm 3 or less. The particle size of the powder is 1000
When it exceeds μm, when it is added to a plastic or an inorganic material, the appearance of particles tends to be generated on the surface appearance. The lower limit of the particle size is not particularly limited, but 0.5 μm is preferable. On the other hand, when the bulk density of the powder exceeds 0.5 g / cm 3 , it becomes almost the same as general natural graphite, and the desired effect of imparting properties cannot be obtained. The particle size of the powder obtained by crushing the expanded graphite molded body of 1000 μm or less and the bulk density of 0.5 g / cm 3 can be achieved by crushing the expanded graphite molded body with, for example, an impact crusher.
【０００７】[0007]
【実施例】次に、本発明の実施例を説明する。 実施例１ セイロン産天然鱗状黒鉛を濃硫酸と濃硝酸との混液で処
理して黒鉛層間化合物を得、次いでこれを１０００℃ま
で加熱処理して、比容積が２００cc/ｇの膨張黒鉛を作
製した。この膨張黒鉛をロールにより連続加圧して密度
が０．５ｇ/cm3の膨張黒鉛成形体を得た。この成形体を
衝撃式粉砕機（ホソカワミクロン製、ビクトリーミル）
で粉砕し、平均粒径が３５０μｍ及び嵩密度が０．１５
ｇ/cm3のフィラー材を得た。Next, embodiments of the present invention will be described. Example 1 Ceylon-produced natural scaly graphite was treated with a mixed solution of concentrated sulfuric acid and concentrated nitric acid to obtain a graphite intercalation compound, which was then heat-treated to 1000 ° C. to prepare expanded graphite having a specific volume of 200 cc / g. . This expanded graphite was continuously pressed by a roll to obtain an expanded graphite compact having a density of 0.5 g / cm 3 . This compact is an impact crusher (Hosokawa Micron, Victory Mill)
Crushed to give an average particle size of 350 μm and a bulk density of 0.15
A filler material of g / cm 3 was obtained.
【０００８】実施例２ 実施例１で用いた膨張黒鉛を実施例１と同様の方法で加
圧して密度が１．０ｇ/cm3の膨張黒鉛成形体を作成し、
これを実施例１で用いた粉砕機で粉砕し、平均粒径が４
５μｍ及び嵩密度が０．１１ｇ/cm3のフィラー材を得
た。 比較例１ 実施例１で用いた膨張黒鉛をボールミルで粉砕して、平
均粒径が３１５μｍ及び嵩密度が０．５８ｇ/cm3のフィ
ラー材を得た。 比較例２ 中国産天然鱗状黒鉛を実施例１で用いた粉砕機で粉砕し
て、平均粒径が４２μｍ及び嵩密度が０．７４ｇ/cm3の
フィラー材を得た。Example 2 The expanded graphite used in Example 1 was pressed in the same manner as in Example 1 to prepare an expanded graphite compact having a density of 1.0 g / cm 3 .
This was crushed with the crusher used in Example 1 to give an average particle size of 4
A filler material having a volume density of 5 μm and a bulk density of 0.11 g / cm 3 was obtained. Comparative Example 1 The expanded graphite used in Example 1 was crushed with a ball mill to obtain a filler material having an average particle size of 315 μm and a bulk density of 0.58 g / cm 3 . Comparative Example 2 Chinese natural scaly graphite was crushed by the crusher used in Example 1 to obtain a filler material having an average particle diameter of 42 μm and a bulk density of 0.74 g / cm 3 .
【０００９】比較例３ 平均粒径が１μｍ以下及び嵩密度が０．１７ｇ/cm3の導
電性カーボンブラックをフィラー材とした。次に上記の
各実施例及び各比較例で得たフィラー材を、出光石油化
学製のポリプロピレン（Ｊ３０５０Ｈ）に１０重量％及
び２０重量％添加して混合し、その混合物を二軸式の練
り込み押出し機を用いて成形用ペレットを作成し、この
ペレットから射出成形機により板厚３mmの試験片を作成
した。この試験片について体積固有抵抗及び熱伝導率を
測定した。この結果を表１に示す。Comparative Example 3 A conductive carbon black having an average particle size of 1 μm or less and a bulk density of 0.17 g / cm 3 was used as a filler material. Next, 10% by weight and 20% by weight of polypropylene (J3050H) manufactured by Idemitsu Petrochemical was added and mixed with the filler material obtained in each of the above Examples and Comparative Examples, and the mixture was kneaded in a biaxial system. A molding pellet was prepared using an extruder, and a test piece having a plate thickness of 3 mm was prepared from the pellet by an injection molding machine. The volume resistivity and the thermal conductivity of this test piece were measured. Table 1 shows the results.
【００１０】[0010]
【表１】 [Table 1]
【００１１】なお、体積固有抵抗及び熱伝導率の測定条
件は次の通りである。 （１）体積固有抵抗（Ωcm） 試験片の表裏面にφ３９mmの大きさに銀ペーストを塗布
して電極とし、この間の電気抵抗値Ｒを測定し、次式に
より体積固有抵抗ρを算出した。The conditions for measuring the volume resistivity and the thermal conductivity are as follows. (1) Volume resistivity (Ωcm) A silver paste having a size of φ39 mm was applied to the front and back surfaces of the test piece to form an electrode, the electrical resistance value R during this was measured, and the volume resistivity ρ was calculated by the following formula.
【００１２】[0012]
【数１】 ここで、Ｗは電極の面積、Ｌは試験片の厚さである。 （２）熱伝導率(cal/sec/cm2/℃/cm) 島津製作所製レーザーフラッシュ方式の熱伝導率測定装
置を用いた。[Equation 1] Here, W is the area of the electrode, and L is the thickness of the test piece. (2) Thermal conductivity (cal / sec / cm 2 / ° C./cm) A Shimadzu laser flash type thermal conductivity measuring device was used.
【００１３】表１から、実施例のフィラー材は比較例の
フィラー材に比べて、同じ量をプラスチックに配合した
ときに良好な導電性と熱伝導性が得られることが示され
る。また、本発明のフィラー材がカーボンブラックより
優れることが明らかである。From Table 1, it is shown that the filler material of the example can obtain good electric conductivity and thermal conductivity when the same amount is blended in the plastic as compared with the filler material of the comparative example. It is also clear that the filler material of the present invention is superior to carbon black.
【００１４】[0014]
【発明の効果】本発明になるフィラー材は、プラスチッ
クや無機材料の中に均一に分散することが可能であり、
従って、プラスチックや無機材料に配合して、導電性や
熱伝導性を向上させることが出来る。The filler material according to the present invention can be uniformly dispersed in a plastic or an inorganic material,
Therefore, the electrical conductivity and the thermal conductivity can be improved by blending with plastics and inorganic materials.
Claims (2)
０μｍ以下及び嵩密度を０．５ｇ/cm3以下としたフィラ
ー材。1. An expanded graphite compact is crushed to a particle size of 100.
A filler material having a particle size of 0 μm or less and a bulk density of 0.5 g / cm 3 or less.
５〜１．８ｇ/cm3である請求項１記載のフィラー材。2. The density of the expanded graphite compact before pulverization is 0.0.
The filler material according to claim 1, which has an amount of 5 to 1.8 g / cm 3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7002627A JPH08188407A (en) | 1995-01-11 | 1995-01-11 | Filler material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7002627A JPH08188407A (en) | 1995-01-11 | 1995-01-11 | Filler material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08188407A true JPH08188407A (en) | 1996-07-23 |
Family
ID=11534641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7002627A Pending JPH08188407A (en) | 1995-01-11 | 1995-01-11 | Filler material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08188407A (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004155948A (en) * | 2002-11-07 | 2004-06-03 | Kanebo Ltd | Hollow molding |
| US6794078B1 (en) * | 1999-12-06 | 2004-09-21 | Hitachi Chemical Company, Ltd. | Fuel cell, fuel cell separator, and method of manufacture thereof |
| JP2006137860A (en) * | 2004-11-12 | 2006-06-01 | Hitachi Chem Co Ltd | Thermal conductive sheet |
| JP2006328143A (en) * | 2005-05-24 | 2006-12-07 | Hitachi Chem Co Ltd | Heat storage material and method for producing the same |
| JP2007031611A (en) * | 2005-07-28 | 2007-02-08 | Teijin Chem Ltd | Thermoplastic resin composition |
| JP2007039328A (en) * | 2005-08-04 | 2007-02-15 | Sgl Carbon Ag | Plaster building material with enhanced thermal conductivity and shielding effect |
| JP2008001744A (en) * | 2006-06-20 | 2008-01-10 | Sumitomo Bakelite Co Ltd | Thermoplastic resin composition and molding using the same |
| JP2011178889A (en) * | 2010-03-01 | 2011-09-15 | Teijin Chem Ltd | Flame-retardant thermoplastic resin composition |
| JP5093102B2 (en) * | 2006-03-28 | 2012-12-05 | 日本ゼオン株式会社 | Thermally conductive pressure-sensitive adhesive composition and thermally conductive pressure-sensitive adhesive sheet-like molded body |
| JP2013018825A (en) * | 2011-07-08 | 2013-01-31 | Sekisui Chem Co Ltd | Flame-retardant resin composition, flame-retardant resin sheet, and flame-retardant multilayer sheet |
| JP2013535402A (en) * | 2010-08-11 | 2013-09-12 | ティムカル ソシエテ アノニム | Grinding expanded graphite agglomerate, method for producing the same, and use thereof |
| JP5621592B2 (en) * | 2008-06-25 | 2014-11-12 | 日本ゼオン株式会社 | Thermally conductive pressure sensitive adhesive composition and thermally conductive pressure sensitive adhesive sheet |
| JP2015157748A (en) * | 2014-01-27 | 2015-09-03 | 積水化学工業株式会社 | Flaky graphite, flaky graphite derivative, flaky graphite-resin composite material and method of producing them |
| CN105148647A (en) * | 2015-08-27 | 2015-12-16 | 保护伞环保科技成都有限公司 | Method for preparing dust coagulants |
| JP2017155250A (en) * | 2017-06-19 | 2017-09-07 | 三菱エンジニアリングプラスチックス株式会社 | Slidable polycarbonate resin composition and molded article |
| US10538691B2 (en) | 2004-08-27 | 2020-01-21 | Toyo Tanso Co., Ltd. | Expanded-graphite sheet |
-
1995
- 1995-01-11 JP JP7002627A patent/JPH08188407A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6794078B1 (en) * | 1999-12-06 | 2004-09-21 | Hitachi Chemical Company, Ltd. | Fuel cell, fuel cell separator, and method of manufacture thereof |
| JP2004155948A (en) * | 2002-11-07 | 2004-06-03 | Kanebo Ltd | Hollow molding |
| US10538691B2 (en) | 2004-08-27 | 2020-01-21 | Toyo Tanso Co., Ltd. | Expanded-graphite sheet |
| JP2006137860A (en) * | 2004-11-12 | 2006-06-01 | Hitachi Chem Co Ltd | Thermal conductive sheet |
| JP2006328143A (en) * | 2005-05-24 | 2006-12-07 | Hitachi Chem Co Ltd | Heat storage material and method for producing the same |
| JP2007031611A (en) * | 2005-07-28 | 2007-02-08 | Teijin Chem Ltd | Thermoplastic resin composition |
| JP2007039328A (en) * | 2005-08-04 | 2007-02-15 | Sgl Carbon Ag | Plaster building material with enhanced thermal conductivity and shielding effect |
| JP5093102B2 (en) * | 2006-03-28 | 2012-12-05 | 日本ゼオン株式会社 | Thermally conductive pressure-sensitive adhesive composition and thermally conductive pressure-sensitive adhesive sheet-like molded body |
| JP2008001744A (en) * | 2006-06-20 | 2008-01-10 | Sumitomo Bakelite Co Ltd | Thermoplastic resin composition and molding using the same |
| JP5621592B2 (en) * | 2008-06-25 | 2014-11-12 | 日本ゼオン株式会社 | Thermally conductive pressure sensitive adhesive composition and thermally conductive pressure sensitive adhesive sheet |
| JP2011178889A (en) * | 2010-03-01 | 2011-09-15 | Teijin Chem Ltd | Flame-retardant thermoplastic resin composition |
| JP2013535402A (en) * | 2010-08-11 | 2013-09-12 | ティムカル ソシエテ アノニム | Grinding expanded graphite agglomerate, method for producing the same, and use thereof |
| US9187612B2 (en) | 2010-08-11 | 2015-11-17 | Imerys Graphite & Carbon Switzerland Sa | Ground expanded graphite agglomerates, methods of making, and applications of the same |
| US9527740B2 (en) | 2010-08-11 | 2016-12-27 | Imerys Graphite & Carbon Switzerland Sa | Ground expanded graphite agglomerates, methods of making, and applications of the same |
| JP2013018825A (en) * | 2011-07-08 | 2013-01-31 | Sekisui Chem Co Ltd | Flame-retardant resin composition, flame-retardant resin sheet, and flame-retardant multilayer sheet |
| JP2015157748A (en) * | 2014-01-27 | 2015-09-03 | 積水化学工業株式会社 | Flaky graphite, flaky graphite derivative, flaky graphite-resin composite material and method of producing them |
| CN105148647A (en) * | 2015-08-27 | 2015-12-16 | 保护伞环保科技成都有限公司 | Method for preparing dust coagulants |
| JP2017155250A (en) * | 2017-06-19 | 2017-09-07 | 三菱エンジニアリングプラスチックス株式会社 | Slidable polycarbonate resin composition and molded article |
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