JP2011189700A - Combined sheet - Google Patents

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JP2011189700A
JP2011189700A JP2010059715A JP2010059715A JP2011189700A JP 2011189700 A JP2011189700 A JP 2011189700A JP 2010059715 A JP2010059715 A JP 2010059715A JP 2010059715 A JP2010059715 A JP 2010059715A JP 2011189700 A JP2011189700 A JP 2011189700A
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graphite
compound
layered silicate
layer
exfoliated
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JP5411758B2 (en
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Yasuhiro Nakatani
康弘 中谷
Takuya Wada
拓也 和田
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Sekisui Chemical Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined sheet having excellent thermal conductivity and insulation properties. <P>SOLUTION: The combined sheet is obtained by alternately layering a thinned graphite layer 1, which includes the thinned graphite obtained by thinning a graphite compound, and a layered silicate layer 2 including layered silicate and integrating them into one body. The combined sheet has insulation properties in the thickness direction thereof and high thermal conductivity in the direction along the surface thereof, high heat resistance since an inorganic component is incorporated mainly as a whole, a low coefficient of linear expansion, high mechanical strength and excellent bending properties. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、複合シートに関する。   The present invention relates to a composite sheet.

近年、炭素骨格を有し且つ形状異方性の高い物質として、黒鉛をその層面間で剥離し、層面(グラフェン)の重なりが数十層以下になるまで薄片化した薄片化黒鉛が注目されており、薄片化黒鉛は非常に大きな表面積を有するため、薄片化黒鉛の添加で各種機能が発現すると期待されている。   In recent years, exfoliated graphite, which has a carbon skeleton and has high shape anisotropy, has been attracted attention by exfoliating graphite between its layer surfaces and exfoliating until the layer surface (graphene) overlaps to several tens of layers or less. Since exfoliated graphite has a very large surface area, the addition of exfoliated graphite is expected to exhibit various functions.

電気部品又は電子部品などに用いられる熱伝導性樹脂シートには、高い熱伝導性及び絶縁性が求められている。このような材料としては、熱硬化性樹脂に無機充填材を充填した樹脂シートなどが提案されている。   High thermal conductivity and insulation are required for thermally conductive resin sheets used for electrical parts or electronic parts. As such a material, a resin sheet in which a thermosetting resin is filled with an inorganic filler has been proposed.

特許文献1には、熱伝導性樹脂シート中に、粒子径の大きい第一充填材と、粒子径の小さい第二充填材とを配合し、第一充填材の隙間を第二充填材で埋めてなる熱伝導性樹脂シートが開示されている。この熱伝導性樹脂シートは、飽和状態に近い状態で無機充填材を配合することができ、熱伝導性樹脂シートは高い熱伝導性を有していることが記載されている。   In Patent Document 1, a first filler having a large particle diameter and a second filler having a small particle diameter are blended in a thermally conductive resin sheet, and the gap between the first fillers is filled with the second filler. A thermally conductive resin sheet is disclosed. It is described that this heat conductive resin sheet can mix | blend an inorganic filler in the state near a saturated state, and a heat conductive resin sheet has high heat conductivity.

しかしながら、熱伝導性樹脂シート中における無機充填材の充填率を高くすると、無機充填材の周囲の空間部に樹脂が回りこまずに空隙が形成されやすくなり、熱電導性樹脂シートの絶縁性が低下するという問題点を有する。   However, when the filling rate of the inorganic filler in the heat conductive resin sheet is increased, the resin does not wrap around in the space around the inorganic filler, so that voids are easily formed, and the insulating property of the heat conductive resin sheet is increased. It has the problem of being lowered.

そこで、上記問題を解決するために、特許文献2には、樹脂と、界面活性剤で被覆され、熱伝導性で且つ絶縁性の充填材とを備え、上記充填材は、上記樹脂中に分散されている熱伝導性樹脂シートが開示されており、窒化ホウ素や酸化アルミニウムなどの充填材の表面を界面活性剤で被覆することが記載されている。   Therefore, in order to solve the above problem, Patent Document 2 includes a resin and a thermally-conductive and insulating filler coated with a surfactant, and the filler is dispersed in the resin. A thermally conductive resin sheet is disclosed, and it is described that the surface of a filler such as boron nitride or aluminum oxide is coated with a surfactant.

しかしながら、界面活性剤の絶縁層では電圧が大きくなると充分な絶縁性が得られないという問題点がある。   However, the surfactant insulating layer has a problem that sufficient insulation cannot be obtained when the voltage increases.

一方、特許文献3には、金属及び/又は炭素からなる高熱伝導性粉末が電気絶縁性被膜で被覆されてなる高熱伝導性複合充填材が提案されている。しかしながら、上記高熱伝導性複合充填材は、粒子の被覆を完全にすることは難しく被覆の欠陥や破損に起因する絶縁性の劣化が生じるという問題点を有している。   On the other hand, Patent Document 3 proposes a high thermal conductive composite filler in which a high thermal conductive powder made of metal and / or carbon is coated with an electrically insulating coating. However, the above-mentioned high thermal conductive composite filler has a problem that it is difficult to completely cover the particles, and the insulation is deteriorated due to defects or breakage of the coating.

近年、電気部品又は電子部品の小型化、高密度化が進み、電子部品からの発熱をより効率的に放熱でき且つ絶縁性の高い熱伝導シートが要望されているが、上記技術では、充分な熱伝導性と絶縁性とを両立させることができなかった。   In recent years, electrical components or electronic components have been reduced in size and increased in density, and there has been a demand for a heat conductive sheet that can efficiently dissipate heat generated from the electronic components and has high insulation properties. Thermal conductivity and insulation could not be achieved at the same time.

特開2008−308576号公報JP 2008-308576 A 特開2009−4536号公報JP 2009-4536 A 特開平8−183875号公報JP-A-8-183875

本発明は、優れた熱伝導性及び絶縁性を有する複合シートを提供する。   The present invention provides a composite sheet having excellent thermal conductivity and insulation.

本発明の複合シートは、黒鉛化合物を薄片化してなる薄片化黒鉛を含む薄片化黒鉛層と、層状珪酸塩を含む層状珪酸塩層とが積層一体化してなることを特徴とする。   The composite sheet of the present invention is characterized in that a exfoliated graphite layer containing exfoliated graphite obtained by exfoliating a graphite compound and a layered silicate layer containing a layered silicate are laminated and integrated.

薄片化黒鉛層を構成している薄片化黒鉛の原料となる黒鉛化合物としては、黒鉛、黒鉛層間化合物の何れであってもよい。なお、黒鉛に官能基が化学的に結合してしても、或いは、黒鉛に官能基が弱い相互作用により疑似的に結合していてもよい。   The graphite compound used as the raw material of the exfoliated graphite constituting the exfoliated graphite layer may be either graphite or a graphite intercalation compound. Note that a functional group may be chemically bonded to graphite, or a functional group may be artificially bonded to graphite due to weak interaction.

黒鉛としては、粒子全体で単一の多層構造を有する黒鉛が好ましく、例えば、天然黒鉛、キッシュ黒鉛、高配向性熱分解黒鉛などが挙げられる。天然黒鉛とキッシュ黒鉛は、各層面(基本層)が略単一の方位を有する単独の結晶であり、高配向性熱分解黒鉛の各層面(基本層)は異なる方位を有する多数の小さな化粧の集合体である。   As the graphite, graphite having a single multilayer structure as a whole is preferable, and examples thereof include natural graphite, quiche graphite, and highly oriented pyrolytic graphite. Natural graphite and quiche graphite are single crystals in which each layer surface (basic layer) has a substantially single orientation, and each layer surface (basic layer) of highly oriented pyrolytic graphite has a number of small makeups having different orientations. It is an aggregate.

黒鉛層間化合物は、上記黒鉛の層面間にインターカレーターを挿入することによって形成されている。黒鉛層間化合物における黒鉛の層面間に挿入されるインターカレーターとしては、特に限定されず、例えば、酸、酸化剤、金属、金属塩、気体、ハロゲン化合物などが挙げられ、高圧条件を用いることなく黒鉛層間化合物を生成することができるので、酸と酸化剤との混合物が好ましい。インターカレーターは単独で用いられても二種以上が併用されてもよい。   The graphite intercalation compound is formed by inserting an intercalator between the graphite layer surfaces. The intercalator inserted between the graphite layer surfaces in the graphite intercalation compound is not particularly limited, and examples thereof include acids, oxidants, metals, metal salts, gases, halogen compounds, and the like, without using high-pressure conditions. Since an intercalation compound can be formed, a mixture of an acid and an oxidizing agent is preferred. An intercalator may be used independently or 2 or more types may be used together.

酸としては、例えば、硝酸、塩酸、硫酸、カルボン酸、クロム酸、リン酸、ヨウ素酸などが挙げられる。酸化剤としては、例えば、硝酸カリウム、硝酸セリウムアンモニウム、過塩素酸、過マンガン酸塩などが挙げられる。金属としては、例えば、カリウム、ナトリウムなどが挙げられる。金属塩としては、例えば、塩化銅、塩化鉄、塩化ナトリウム、塩化カリウム、硫酸銅、酢酸ナトリウムなどが挙げられる。気体としては、例えば、水素などが挙げられる。ハロゲン化合物としては、例えば、塩化ヨウ素、塩化臭素、臭化ヨウ素、フッ化ヨウ素、フッ化臭素、フッ化塩素、フッ素、塩素、塩化アルミニウムなどが挙げられる。   Examples of the acid include nitric acid, hydrochloric acid, sulfuric acid, carboxylic acid, chromic acid, phosphoric acid, iodic acid and the like. Examples of the oxidizing agent include potassium nitrate, cerium ammonium nitrate, perchloric acid, permanganate and the like. Examples of the metal include potassium and sodium. Examples of the metal salt include copper chloride, iron chloride, sodium chloride, potassium chloride, copper sulfate, sodium acetate and the like. Examples of the gas include hydrogen. Examples of the halogen compound include iodine chloride, bromine chloride, iodine bromide, iodine fluoride, bromine fluoride, chlorine fluoride, fluorine, chlorine, and aluminum chloride.

黒鉛の層面間にインターカレーターを挿入して黒鉛層間化合物を製造する方法としては、公知の方法を採用することができ、例えば、黒鉛をインターカレーターの溶液に分散させて、分散液中において黒鉛とインターカレーターとを反応させて黒鉛層間化合物を製造する方法、黒鉛と気体状のインターカレーターとを高圧下にて反応させて黒鉛層間化合物を製造する方法、酸化剤を用いてHummers−Offeman法によって黒鉛層間化合物を製造する方法などが挙げられ、酸化剤を用いてHummers−Offeman法によって黒鉛層間化合物を製造する方法が好ましい。   As a method for producing a graphite intercalation compound by inserting an intercalator between graphite layer surfaces, a known method can be adopted. For example, graphite is dispersed in an intercalator solution, and graphite and A method for producing a graphite intercalation compound by reacting with an intercalator, a method for producing a graphite intercalation compound by reacting graphite and a gaseous intercalator under high pressure, and a graphite by a Hummers-Offeman method using an oxidizing agent. The method of manufacturing an intercalation compound etc. are mentioned, The method of manufacturing a graphite intercalation compound by the Hummers-Offeman method using an oxidizing agent is preferred.

上述の要領で製造された黒鉛層間化合物に薄層化処理を施して原料黒鉛よりも薄層化させておくことが好ましい。黒鉛層間化合物に施す薄層化処理としては、例えば、黒鉛層間化合物にマイクロ波又は超音波を照射する方法、黒鉛層間化合物に物理的に応力を加えて黒鉛層間化合物を粉砕する方法などが挙げられる。   It is preferable to apply a thinning treatment to the graphite intercalation compound produced as described above to make it thinner than the raw material graphite. Examples of the thinning treatment applied to the graphite intercalation compound include a method of irradiating the graphite intercalation compound with microwaves or ultrasonic waves, and a method of physically applying stress to the graphite intercalation compound to pulverize the graphite intercalation compound. .

黒鉛化合物において、レーザー光回折法により粒度分布を測定した場合に50%体積平均径として得られる値は、小さいと、黒鉛化合物を薄片化して得られる薄片化黒鉛において異方性が得られないことがあり、大きいと、黒鉛化合物の層面間に五員環を含有する環状化合物が侵入しにくくなり、黒鉛化合物の薄片化が進行しにくいことがあるので、0.1〜50μmが好ましい。   In graphite compounds, when the particle size distribution is measured by the laser diffraction method, the value obtained as the 50% volume average diameter is small, and anisotropy cannot be obtained in exfoliated graphite obtained by exfoliating graphite compounds. If it is large, a cyclic compound containing a five-membered ring does not easily enter between the layer surfaces of the graphite compound, and the flaking of the graphite compound may not easily proceed, so 0.1 to 50 μm is preferable.

なお、レーザー光回折法により粒度分布を測定した場合に50%体積平均径として得られる値が20μm未満である黒鉛化合物は、例えば、SECカーボン社から商品名「SNO−15」などのSNOシリーズにて、中越黒鉛工業所から商品名「CX−3000」にて、伊藤黒鉛社からCNP−シリーズにて、XGSience社から商品名「XGnP−5」にて市販されている。   In addition, when the particle size distribution is measured by a laser light diffraction method, a graphite compound having a value obtained as a 50% volume average diameter of less than 20 μm is, for example, an SNO series such as a trade name “SNO-15” from SEC Carbon. These products are commercially available from Chuetsu Graphite Industries Co., Ltd. under the trade name “CX-3000”, from Ito Graphite Co. in the CNP-series, and from XGSience Corporation under the trade name “XGnP-5”.

次に、黒鉛化合物を薄片化する方法としては、黒鉛化合物を構成している層面を剥離させて薄片化黒鉛とすることができれば、特に限定されず、例えば、(1)黒鉛化合物と、一級アミン、ヒドラジン及びアンモニアからなる群から選ばれた少なくとも一種の窒素化合物と、水とを混合してpHが10〜14である混合液とし、上記黒鉛化合物を薄片化する薄片化黒鉛の製造方法、(2)黒鉛化合物と五員環を含有する環状化合物とを含む被処理液を振とうさせて、上記黒鉛化合物を薄片化する薄片化黒鉛の製造方法、(3)黒鉛化合物とアルカリ金属の水酸化物と水とを混合してpHが7〜10である混合液とし、上記黒鉛化合物を薄片化する薄片化黒鉛の製造方法などが挙げられる。   Next, the method of exfoliating the graphite compound is not particularly limited as long as the layer surface constituting the graphite compound can be peeled to obtain exfoliated graphite. For example, (1) a graphite compound and a primary amine , A method for producing exfoliated graphite, wherein at least one nitrogen compound selected from the group consisting of hydrazine and ammonia and water are mixed to form a mixed solution having a pH of 10 to 14, and the graphite compound is exfoliated, 2) A method for producing exfoliated graphite in which a liquid to be treated containing a graphite compound and a cyclic compound containing a five-membered ring is shaken to exfoliate the graphite compound, and (3) hydroxylation of the graphite compound and alkali metal. Examples include a method for producing exfoliated graphite, in which a product and water are mixed to obtain a mixed solution having a pH of 7 to 10, and the graphite compound is exfoliated.

上記(1)の薄片化黒鉛の製造方法を説明する。窒素化合物としては、一級アミン、ヒドラジン及びアンモニアからなる群から選ばれた少なくとも一種の窒素化合物が用いられる。一級アミンとしては、例えば、メチルアミン、エタノールアミンなどが挙げられる。なお、窒素化合物は、単独で用いられても二種以上が併用されてもよい。   The method for producing exfoliated graphite (1) above will be described. As the nitrogen compound, at least one nitrogen compound selected from the group consisting of primary amine, hydrazine and ammonia is used. Examples of the primary amine include methylamine and ethanolamine. In addition, a nitrogen compound may be used independently or 2 or more types may be used together.

黒鉛化合物と窒素化合物と水とを混合して混合液を作製する方法としては、特に限定されず、例えば、黒鉛化合物を水に分散させて黒鉛化合物分散液を作製すると共に、窒素化合物を水に溶解させて窒素化合物水溶液を作製し、黒鉛化合物分散液と窒素化合物水溶液とを均一に混合して混合液を作製する方法、窒素化合物を水に溶解させて窒素化合物水溶液を作製し、この窒素化合物水溶液に黒鉛化合物を添加して均一に混合して混合液を作製する方法などが挙げられる。   A method for preparing a mixed liquid by mixing a graphite compound, a nitrogen compound, and water is not particularly limited. For example, a graphite compound is dispersed in water to prepare a graphite compound dispersion, and the nitrogen compound is mixed in water. A method of dissolving a nitrogen compound aqueous solution to prepare a mixed liquid by uniformly mixing a graphite compound dispersion and a nitrogen compound aqueous solution, and dissolving the nitrogen compound in water to prepare a nitrogen compound aqueous solution. Examples thereof include a method in which a graphite compound is added to an aqueous solution and mixed uniformly to prepare a mixed solution.

黒鉛化合物と窒素化合物と水とを混合させて混合液を作製するにあたって、得られる混合液のpHが10〜14となるように黒鉛化合物と窒素化合物と水の混合割合を調整する必要がある。   In preparing a mixed solution by mixing a graphite compound, a nitrogen compound, and water, it is necessary to adjust the mixing ratio of the graphite compound, the nitrogen compound, and water so that the pH of the obtained mixed solution becomes 10-14.

混合液をpH10〜14に調整する理由は明確には解明されていないが、黒鉛化合物の層面間に窒素化合物を挿入させることによって、窒素化合物の有する非共有電子対間の静電反発力によって黒鉛化合物の対向する層面を互いが離間する方向に変位させることにより黒鉛化合物の層面間の間隔が拡がり、黒鉛化合物における層面間の剥離の進行を促進し黒鉛化合物を薄片化して薄片化黒鉛の製造を効率的に行うことができると考えている。そして、混合液をpHが10〜14となるように調整することによって、黒鉛化合物の層面間への窒素化合物の進入が容易となり、その結果、上述の作用によって黒鉛化合物の層面間における剥離が円滑に行われて黒鉛化合物を薄片化して薄片化黒鉛を効率良く製造できると考えられる。   The reason for adjusting the mixed solution to pH 10 to 14 is not clearly clarified, but by inserting a nitrogen compound between the layer surfaces of the graphite compound, the graphite repulsive force between the unshared electron pairs of the nitrogen compound is reduced. Displacement of the opposing layer surfaces of the compound in the direction away from each other widens the spacing between the layer surfaces of the graphite compound, promotes the progress of delamination between the layer surfaces of the graphite compound, and exfoliates the graphite compound to produce exfoliated graphite. I think it can be done efficiently. Then, by adjusting the mixed solution so that the pH is 10 to 14, the nitrogen compound can easily enter between the layer surfaces of the graphite compound, and as a result, the peeling between the layer surfaces of the graphite compound is smooth due to the above-described action. It is considered that the exfoliated graphite can be efficiently produced by flaking the graphite compound.

上述のように、黒鉛化合物と窒素化合物と水とを混合させてpHが10〜14の混合液を製造した後、この混合液を静置することによって黒鉛化合物の層面間における剥離を進行させ、黒鉛化合物を薄片化させて得られる薄片化黒鉛が水中に安定的に分散してなる薄片化黒鉛分散液を得ることができる。   As described above, a graphite compound, a nitrogen compound, and water are mixed to produce a mixed solution having a pH of 10 to 14, and then the separation between the layer surfaces of the graphite compound proceeds by allowing the mixed solution to stand, An exfoliated graphite dispersion liquid in which exfoliated graphite obtained by exfoliating a graphite compound is stably dispersed in water can be obtained.

次に、上記(2)の薄片化黒鉛の製造方法を説明する。先ず、上記黒鉛化合物と五員環を含有する環状化合物とを含有する被処理液を用意する。五員環を含有する環状化合物としては、特に限定されず、例えば、テトラヒドロフラン、N−メチルピロリドン、ピロール、チオフェン、イミダゾール、ピラゾール、チアゾール又はこれらの誘導体が挙げられ、テトラヒドロフラン、N−メチルピロリドンが好ましい。なお、五員環を含有する環状化合物は単独で用いられても二種以上が併用されてもよい。   Next, the manufacturing method of the exfoliated graphite of said (2) is demonstrated. First, a liquid to be treated containing the graphite compound and a cyclic compound containing a five-membered ring is prepared. The cyclic compound containing a five-membered ring is not particularly limited, and examples thereof include tetrahydrofuran, N-methylpyrrolidone, pyrrole, thiophene, imidazole, pyrazole, thiazole or derivatives thereof, and tetrahydrofuran and N-methylpyrrolidone are preferable. . In addition, the cyclic compound containing a 5-membered ring may be used independently, or 2 or more types may be used together.

五員環を含有する環状化合物が官能基を有している場合、官能基の炭素数は、大きいと、黒鉛化合物の層面間に五員環を含有する環状化合物が進入しにくくなり、黒鉛化合物の薄片化が進みにくくなることがあるので、4以下が好ましい。   When the cyclic compound containing a five-membered ring has a functional group, if the carbon number of the functional group is large, the cyclic compound containing the five-membered ring is difficult to enter between the layer surfaces of the graphite compound, and the graphite compound Is preferably 4 or less, because it may be difficult to proceed with thinning.

被処理液中における黒鉛化合物と五員環を有する環式化合物との含有割合は、黒鉛化合物が少ないと、黒鉛化合物に対して多量の溶媒を使用することとなり、環境負荷が大きくなることがあり、黒鉛化合物が多いと、黒鉛化合物の層面間に五員環を有する環式化合物が進入しにくくなることがあるので、黒鉛化合物100重量部に対して五員環を含有する環状化合物100〜100万重量部が好ましく、1000〜10万重量部がより好ましい。   The content ratio of the graphite compound and the cyclic compound having a five-membered ring in the liquid to be treated is such that if the graphite compound is small, a large amount of solvent is used for the graphite compound, which may increase the environmental load. If the graphite compound is large, a cyclic compound having a five-membered ring may not easily enter between the graphite compound layer surfaces. Therefore, the cyclic compounds 100 to 100 containing a five-membered ring with respect to 100 parts by weight of the graphite compound. 10,000 parts by weight is preferable, and 1,000 to 100,000 parts by weight is more preferable.

黒鉛化合物と五員環を含有する環状化合物とを含有する被処理液を作製する方法としては、特に限定されず、例えば、黒鉛化合物を入れた容器内に五員環を含有する環状化合物を供給してもよいし、五員環を含有する環状化合物中に黒鉛化合物を供給してもよい。   A method for preparing a liquid to be treated containing a graphite compound and a cyclic compound containing a five-membered ring is not particularly limited. For example, a cyclic compound containing a five-membered ring is supplied into a container containing the graphite compound. Alternatively, the graphite compound may be supplied into a cyclic compound containing a five-membered ring.

そして、被処理液を振とうさせて黒鉛化合物を薄片化して、薄片化黒鉛が五員環を含有する環状化合物中に分散してなる薄片化黒鉛分散液を製造することができる。被処理液の振とう方法としては、特に限定されず、例えば、被処理液を入れた容器を手で上下方向又は左右方向に振ることによって容器内の被処理液を振とうする方法、被処理液を入れた容器を振とう装置に配設して容器を振とうさせて容器内の被処理液を振とうする方法などが挙げられる。   And a to-be-processed liquid is shaken, and a graphite compound is exfoliated, The exfoliated graphite dispersion liquid in which exfoliated graphite disperse | distributes in the cyclic compound containing a 5-membered ring can be manufactured. The method for shaking the liquid to be treated is not particularly limited. For example, a method for shaking the liquid to be treated in the container by shaking the container containing the liquid to be treated in the vertical direction or the left-right direction by hand. Examples include a method in which a container containing a liquid is disposed in a shaking device and the container is shaken to shake the liquid to be treated in the container.

このように、被処理液を振とうすることによって黒鉛化合物が薄片化されて、薄片化黒鉛が五員環を含有する環状化合物中に分散してなる薄片化黒鉛分散液が得られる理由は明確には解明されていないが、黒鉛化合物が黒鉛である場合には以下のように推察される。五員環を有する環式化合物は、黒鉛化合物と分子構造が類似しているため、黒鉛化合物の層面間に進入し易く、五員環を含有する環状化合物が黒鉛の層面間に進入することによって、互いに隣接する層面間に働いているファンデルワールス結合を切断することができ、その結果、黒鉛の層面間同士の剥離を容易にし、黒鉛の薄片化を進行させているものと考えられる。   Thus, it is clear why the exfoliated graphite dispersion liquid is obtained by exfoliating the graphite compound by shaking the liquid to be treated and dispersing the exfoliated graphite in a cyclic compound containing a five-membered ring. However, when the graphite compound is graphite, it is presumed as follows. Since a cyclic compound having a five-membered ring has a molecular structure similar to that of a graphite compound, it easily enters between the layer surfaces of the graphite compound, and a cyclic compound containing a five-membered ring enters between the layer surfaces of the graphite. It is considered that van der Waals bonds acting between adjacent layer surfaces can be cut, and as a result, the graphite layer surfaces can be easily separated from each other, and the graphite thinning is promoted.

又、黒鉛化合物が黒鉛層間化合物又は官能基を有する黒鉛である場合にも、インターカレーターが挿入されていない層面間や、官能基を有していない層面間において、上述の現象が生じる結果、黒鉛化合物の薄片化をより効率良く行うことができるものと考えられる。   Further, when the graphite compound is a graphite intercalation compound or a graphite having a functional group, the above phenomenon occurs as a result of the above phenomenon occurring between the layer surfaces in which no intercalator is inserted or between the layer surfaces having no functional group. It is considered that the compound can be thinned more efficiently.

続いて、上記(3)の薄片化黒鉛の製造方法を説明する。アルカリ金属の水酸化物としては、特に限定されず、例えば、水酸化ナトリウム、水酸化カリウム、水酸化リチウムなどが挙げられ、水酸化ナトリウム、水酸化カリウムが好ましい。なお、アルカリ金属の水酸化物は、単独で用いられても二種以上が併用されてもよい。   Then, the manufacturing method of the exfoliated graphite of said (3) is demonstrated. The alkali metal hydroxide is not particularly limited, and examples thereof include sodium hydroxide, potassium hydroxide, and lithium hydroxide, and sodium hydroxide and potassium hydroxide are preferable. The alkali metal hydroxides may be used alone or in combination of two or more.

黒鉛化合物とアルカリ金属の水酸化物と水とを混合して混合液を作製する方法としては、特に限定されず、例えば、黒鉛化合物を水に分散させて黒鉛化合物分散液を作製すると共に、アルカリ金属の水酸化物を水に溶解させてアルカリ金属の水酸化物水溶液を作製し、黒鉛化合物分散液とアルカリ金属の水酸化物水溶液とを均一に混合して混合液を作製する方法、アルカリ金属の水酸化物を水に溶解させてアルカリ金属の水酸化物水溶液を作製し、このアルカリ金属の水酸化物水溶液に黒鉛化合物を添加して均一に混合して混合液を作製する方法などが挙げられる。   A method of preparing a mixed liquid by mixing a graphite compound, an alkali metal hydroxide, and water is not particularly limited. For example, a graphite compound dispersion is prepared by dispersing a graphite compound in water, and an alkali is used. A method in which a metal hydroxide is dissolved in water to prepare an alkali metal hydroxide aqueous solution, and a graphite compound dispersion and an alkali metal hydroxide aqueous solution are uniformly mixed to prepare a mixed solution, alkali metal A method of preparing an aqueous solution of an alkali metal hydroxide by dissolving the hydroxide of water in water, adding a graphite compound to the aqueous solution of the alkali metal hydroxide and uniformly mixing the solution, etc. It is done.

黒鉛化合物とアルカリ金属の水酸化物と水とを混合させて混合液を作製するにあたって、得られる混合液のpHが7〜10となるように黒鉛化合物とアルカリ金属の水酸化物と水の混合割合を調整する。黒鉛化合物が黒鉛(黒鉛が官能基を有する場合を含む)である場合には、混合液のpHを8〜10に調整することが好ましい。   When preparing a mixed solution by mixing a graphite compound, an alkali metal hydroxide and water, mixing the graphite compound, the alkali metal hydroxide and water so that the pH of the resulting mixed solution is 7 to 10 Adjust the percentage. When the graphite compound is graphite (including the case where the graphite has a functional group), it is preferable to adjust the pH of the mixed solution to 8 to 10.

混合液をpH7〜10に調整する理由は明確には解明されていないが、アルカリ金属の水酸化物由来のアルカリ金属イオンが黒鉛化合物の層面間に進入し、アルカリ金属イオンの有する正電荷同士の反発力によって、黒鉛化合物の対向する層面を互いが離間する方向に変位させることにより黒鉛化合物の層面間の間隔が拡がり、黒鉛化合物における層面間の剥離の進行を促進し黒鉛化合物を薄片化して薄片化黒鉛の製造を効率的に行うことができると考えている。そして、分散液をpHが7〜10に調整することによって、黒鉛化合物の層面間へのアルカリ金属の水酸化物由来のアルカリ金属イオンの進入が容易となり、その結果、上述の作用によって黒鉛化合物の層面間における剥離が円滑に行われて黒鉛化合物を薄片化して薄片化黒鉛を効率良く製造できると考えられる。   The reason for adjusting the mixed solution to pH 7 to 10 is not clearly understood, but alkali metal ions derived from alkali metal hydroxide enter between the layer surfaces of the graphite compound, and the positive charges of the alkali metal ions are between each other. By repelling, the opposing layer surfaces of the graphite compound are displaced in a direction away from each other, thereby widening the spacing between the layer surfaces of the graphite compound, promoting the progress of delamination between the layer surfaces in the graphite compound, and flaking the graphite compound We believe that it is possible to efficiently produce graphite oxide. Then, by adjusting the pH of the dispersion to 7 to 10, it becomes easy for alkali metal ions derived from alkali metal hydroxide to enter between the layer surfaces of the graphite compound. It is considered that exfoliation between the layer surfaces is smoothly performed, and the graphite compound is exfoliated to efficiently produce exfoliated graphite.

上述のように、黒鉛化合物とアルカリ金属の水酸化物と水とを混合させてpHが7〜10の混合液を製造した後、この混合液を静置することによって黒鉛化合物の層面間における剥離を進行させ、黒鉛化合物を薄片化させて得られる薄片化黒鉛が水中に安定的に分散してなる薄片化黒鉛分散液を得ることができる。   As described above, a graphite compound, an alkali metal hydroxide, and water are mixed to produce a mixed liquid having a pH of 7 to 10, and then the mixed liquid is allowed to stand to peel off the graphite compound between the layer surfaces. To obtain a exfoliated graphite dispersion in which exfoliated graphite obtained by exfoliating a graphite compound is stably dispersed in water.

一方、複合シートの層状珪酸塩層を構成している層状珪酸塩としては、天然物であっても合成物であってもよく、例えば、モンモリロナイト、サポナイト、ヘクトライト、バイデライト、スティブンサイト、ノントロナイトなどのスメクタイト系粘土鉱物や、バーミキュライト、ハロイサイト、膨潤性マイカなどが挙げられ、モンモリロナイト、膨潤性マイカが好ましい。なお、層状珪酸塩は、単独で用いられても二種以上が併用されてもよい。   On the other hand, the layered silicate constituting the layered silicate layer of the composite sheet may be a natural product or a synthetic product. For example, montmorillonite, saponite, hectorite, beidellite, stevensite, non-site Examples thereof include smectite clay minerals such as tronite, vermiculite, halloysite, and swellable mica. Montmorillonite and swellable mica are preferred. In addition, a layered silicate may be used independently or 2 or more types may be used together.

本発明の複合シートAは、図1に示したように、黒鉛化合物を薄片化してなる薄片化黒鉛からなる薄片化黒鉛層1と、層状珪酸塩からなる層状珪酸塩層2とが積層一体化してなる。図1においては、複合シートAは、複数の薄片化黒鉛層1及び層状珪酸塩層2が互いに交互に積層一体化されている場合を示したが、薄片化黒鉛層1と層状珪酸塩層2とは交互に積層一体化されている必要はない。又、複合シートAは、薄片化黒鉛層1と層状珪酸塩層2とを一層づつ有し、薄片化黒鉛層1の一面に層状珪酸塩層2が積層一体化されてなるものであってもよい。   In the composite sheet A of the present invention, as shown in FIG. 1, a exfoliated graphite layer 1 made of exfoliated graphite obtained by exfoliating a graphite compound and a layered silicate layer 2 made of layered silicate are laminated and integrated. It becomes. In FIG. 1, the composite sheet A shows a case where a plurality of exfoliated graphite layers 1 and layered silicate layers 2 are alternately laminated and integrated with each other, but exfoliated graphite layers 1 and layered silicate layers 2 are shown. Need not be alternately laminated and integrated. Further, the composite sheet A may include the exfoliated graphite layer 1 and the layered silicate layer 2 one by one, and the layered silicate layer 2 may be laminated and integrated on one surface of the exfoliated graphite layer 1. Good.

なお、同一の構成を有していない薄片化黒鉛層1同士は、互いに相違する薄片化黒鉛層1とし、同一の構成を有していない層状珪酸塩層2同士は、互いに相違する層状珪酸塩層2とする。   The exfoliated graphite layers 1 that do not have the same configuration are the exfoliated graphite layers 1 that are different from each other, and the layered silicate layers 2 that do not have the same configuration are the different layered silicates. Layer 2 is assumed.

又、薄片化黒鉛層1には、その熱伝導性を損なわない範囲内において、薄片化黒鉛以外の化合物が含まれていてもよく、このような場合、薄片化黒鉛層1中における薄片化黒鉛の含有量は、少ないと、複合シートの熱伝導性が低下することがあるので、50重量%以上が好ましく、80〜100重量%がより好ましい。   The exfoliated graphite layer 1 may contain a compound other than the exfoliated graphite as long as the thermal conductivity is not impaired. In such a case, the exfoliated graphite in the exfoliated graphite layer 1 may be contained. If the content of is small, the thermal conductivity of the composite sheet may be lowered, so that it is preferably 50% by weight or more, more preferably 80 to 100% by weight.

層状珪酸塩層2には、その絶縁性を損なわない範囲内において、層状珪酸塩以外の化合物が含まれていてもよく、このような場合、層状珪酸塩層2中における層状珪酸塩の含有量は、少ないと、複合シートの絶縁性が低下することがあるので、50重量%以上が好ましく、80〜100重量%がより好ましい。   The layered silicate layer 2 may contain a compound other than the layered silicate within a range not impairing its insulating properties. In such a case, the content of the layered silicate in the layered silicate layer 2 If the amount is too small, the insulating properties of the composite sheet may be lowered, so 50% by weight or more is preferable, and 80 to 100% by weight is more preferable.

特に、複合シートAとしては、薄片化黒鉛層1と層状珪酸塩層2とを有し、二層以上の層状珪酸塩層2を有しており、層状珪酸塩層2、2が複合シートAの両最外層を構成している複合シートAが好ましい。具体的には、図2に示したように、薄片化黒鉛層1の両面のそれぞれに層状珪酸塩層2、2が積層一体化されている複合シートAが挙げられる。   In particular, the composite sheet A has a exfoliated graphite layer 1 and a layered silicate layer 2, and has two or more layered silicate layers 2. The layered silicate layers 2 and 2 are composite sheets A. The composite sheet A constituting both outermost layers is preferable. Specifically, as shown in FIG. 2, there is a composite sheet A in which layered silicate layers 2 and 2 are laminated and integrated on both surfaces of exfoliated graphite layer 1.

このように、複合シートAの両方の最外層を層状珪酸塩層2、2によって形成することによって、電気部品や電子部品などのように、絶縁性が要求され且つ熱伝導性が要求される用途に好適に用いることができる。   In this way, by forming both outermost layers of the composite sheet A with the layered silicate layers 2, 2, applications where insulation is required and thermal conductivity is required, such as electrical parts and electronic parts. Can be suitably used.

次に、本発明の複合シートAの製造方法について説明する。複合シートAの製造方法は、特に限定されない。例えば、層状珪酸塩を分散媒体中に分散させてなる層状珪酸塩分散液をフィルター上に供給して層状珪酸塩分散液中の分散媒体をフィルターによって除去してフィルター上に層状に堆積した層状珪酸塩を乾燥させることによって、層状珪酸塩を含む層状珪酸塩層を作製する。   Next, the manufacturing method of the composite sheet A of this invention is demonstrated. The manufacturing method of the composite sheet A is not particularly limited. For example, a layered silicate dispersion obtained by dispersing a layered silicate dispersion in a layered silicate dispersion on a filter by removing the dispersion medium in the layered silicate dispersion by a filter and depositing the layered layer on the filter A layered silicate layer containing a layered silicate is produced by drying the salt.

続いて、フィルター上の層状珪酸塩層上に上述の薄片化黒鉛分散液を層状に塗布し乾燥させることによって、薄片化黒鉛を含む薄片化黒鉛層を層状珪酸塩層上に積層一体化する。しかる後、薄片化黒鉛層上に、層状珪酸塩を分散媒体中に分散させてなる層状珪酸塩分散液を層状に塗布し乾燥させることによって、層状珪酸塩を含む層状珪酸塩層を薄片化黒鉛層上に積層一体化させる。   Subsequently, the exfoliated graphite dispersion containing the exfoliated graphite is laminated and integrated on the lamellar silicate layer by applying the exfoliated graphite dispersion liquid in layers on the lamellar silicate layer on the filter and drying it. Thereafter, the layered silicate layer containing the layered silicate is exfoliated graphite by applying a layered silicate dispersion liquid in which the layered silicate is dispersed in a dispersion medium on the exfoliated graphite layer and drying the layered layer. Laminate and integrate on the layer.

上述した、層状珪酸塩層上に薄片化黒鉛層を積層一体化させる要領と、薄片化黒鉛層上に層状珪酸塩層を積層一体化させる要領とを必要な回数だけ好ましくは交互に繰返し行い、層状珪酸塩層と薄片化黒鉛層とが積層一体化されてなる複合シートを製造することができる。なお、複合シートAの両方の最外層を層状珪酸塩層2、2によって形成する場合には、複合シートAの製造工程を、薄片化黒鉛層1上に層状珪酸塩層2を積層一体化させる工程で終了すればよい。   The above-described procedure for laminating and integrating the exfoliated graphite layer on the lamellar silicate layer and the procedure for laminating and integrating the lamellar silicate layer on the exfoliated graphite layer are preferably repeated alternately as necessary, A composite sheet in which a layered silicate layer and a exfoliated graphite layer are laminated and integrated can be manufactured. In the case where both outermost layers of the composite sheet A are formed by the layered silicate layers 2 and 2, the manufacturing process of the composite sheet A is performed by laminating and integrating the layered silicate layer 2 on the exfoliated graphite layer 1. What is necessary is just to complete | finish by a process.

又、層状珪酸塩を分散媒体中に分散させてなる層状珪酸塩分散液をフィルター上に供給して層状珪酸塩分散液中の分散媒体をフィルターによって除去してフィルター上に層状に堆積した層状珪酸塩を乾燥させることによって、層状珪酸塩を含む層状珪酸塩シートを作製する。一方、上述した要領で薄片化黒鉛シートを製造し、層状珪酸塩シートと薄片化黒鉛シートとを所望の層数づつ、粘着剤や接着剤などの汎用の方法を用いて積層一体化して複合シートを製造してもよい。   In addition, a layered silicate dispersion in which a layered silicate is dispersed in a dispersion medium is supplied onto the filter, and the dispersion medium in the layered silicate dispersion is removed by the filter, and the layered silicate deposited in layers on the filter A layered silicate sheet containing a layered silicate is produced by drying the salt. On the other hand, a exfoliated graphite sheet is manufactured in the manner described above, and a layered silicate sheet and exfoliated graphite sheet are laminated and integrated using a general-purpose method such as a pressure-sensitive adhesive or an adhesive in a desired number of layers. May be manufactured.

層状珪酸塩分散液を構成している分散媒体としては、層状珪酸塩を分散させることができれば、特に限定されず、例えば、水、メチルアルコール、エチルアルコール、ブチルアルコール、プロピルアルコール、グリコールなどのアルコールなどが挙げられ、水が好ましい。   The dispersion medium constituting the layered silicate dispersion is not particularly limited as long as the layered silicate can be dispersed. For example, alcohols such as water, methyl alcohol, ethyl alcohol, butyl alcohol, propyl alcohol, and glycol are used. Water is preferable.

上述では、薄片化黒鉛分散液として上述で得られた薄片化黒鉛分散液を用いた場合を説明したが、薄片化黒鉛分散液から薄片化黒鉛を分離し、この薄片化黒鉛を用いる場合は、薄片化黒鉛を分散媒体中に分散させて得られる薄片化黒鉛分散液を用いてもよい。なお、分散媒体としては、層状珪酸塩分散液を構成している分散媒体と同様であるのでその説明を省略する。   In the above description, the exfoliated graphite dispersion obtained above was used as the exfoliated graphite dispersion. However, when exfoliated graphite is separated from the exfoliated graphite dispersion and this exfoliated graphite is used, A exfoliated graphite dispersion obtained by dispersing exfoliated graphite in a dispersion medium may be used. Since the dispersion medium is the same as the dispersion medium constituting the layered silicate dispersion, the description thereof is omitted.

上記薄片化黒鉛分散液中における薄片化黒鉛の含有量は、少ないと、複合シートの強度が不充分となることがあり、多いと、複合シートの製造が困難となることがあるので、0.1〜95重量%が好ましく、0.2〜50重量%がより好ましい。   If the exfoliated graphite content in the exfoliated graphite dispersion is small, the strength of the composite sheet may be insufficient, and if it is large, it may be difficult to produce the composite sheet. 1 to 95% by weight is preferable, and 0.2 to 50% by weight is more preferable.

又、上記層状珪酸塩分散液中における層状珪酸塩の含有量は、少ないと、複合シートの強度が不充分となることがあり、多いと、複合シートの製造が困難となることがあるので、0.1〜95重量%が好ましく、1〜50重量%がより好ましい。   In addition, if the content of the layered silicate in the layered silicate dispersion is small, the strength of the composite sheet may be insufficient, and if it is large, it may be difficult to produce the composite sheet. 0.1 to 95 weight% is preferable and 1 to 50 weight% is more preferable.

複合シートAにおいて、薄片化黒鉛層1の厚みは、薄いと、複合シートの熱伝導性が低下することがあり、厚いと、複合シートの取扱性が低下することがあるので、0.01〜5mmが好ましく、0.05〜1mmがより好ましい。   In the composite sheet A, if the thickness of the exfoliated graphite layer 1 is thin, the thermal conductivity of the composite sheet may be reduced. If it is thick, the handleability of the composite sheet may be reduced. 5 mm is preferable and 0.05-1 mm is more preferable.

又、複合シートAの層状珪酸塩層2の厚みは、薄いと、複合シートの絶縁性が低下することがあり、厚いと、複合シートの取扱性が低下することがあるので、0.01〜5mmが好ましく、0.05〜1mmがより好ましい。   Moreover, if the thickness of the layered silicate layer 2 of the composite sheet A is thin, the insulating properties of the composite sheet may be reduced. If it is thick, the handleability of the composite sheet may be reduced. 5 mm is preferable and 0.05-1 mm is more preferable.

本発明の複合シートは、黒鉛化合物を薄片化してなる薄片化黒鉛を含む薄片化黒鉛層と、層状珪酸塩を含む層状珪酸塩層とが積層一体化してなることを特徴とするので、複合シートの厚み方向には絶縁性を有し、複合シートの面に沿った方向には高い熱伝導性を有すると共に、全体として無機成分が多いために耐熱性が高く、線膨張率も低く、更に、複合シートの機械的強度も高く且つ優れた屈曲性も有している。   The composite sheet of the present invention is characterized in that a exfoliated graphite layer containing exfoliated graphite obtained by exfoliating a graphite compound and a layered silicate layer containing layered silicate are laminated and integrated. It has insulation in the thickness direction, high thermal conductivity in the direction along the surface of the composite sheet, high heat resistance due to the large amount of inorganic components as a whole, low linear expansion coefficient, The composite sheet has high mechanical strength and excellent flexibility.

そして、上記複合シートにおいて、二層以上の層状珪酸塩と、薄片化黒鉛層とが積層一体化しており、最外層が共に上記層状珪酸塩層から構成されている場合には、優れた絶縁性及び熱伝導性を有しており、電子部品や電気部品などの幅広い用途に用いることができる。   In the composite sheet, when two or more layered silicates and exfoliated graphite layers are laminated and integrated, and the outermost layers are both composed of the layered silicate layers, excellent insulating properties are obtained. In addition, it has thermal conductivity and can be used for a wide range of applications such as electronic parts and electrical parts.

本発明の複合シートを示した模式断面図である。It is the schematic cross section which showed the composite sheet of this invention. 本発明の複合シートの他の一例を示した模式断面図である。It is the schematic cross section which showed other examples of the composite sheet of this invention.

次に本発明の実施例を説明するが、本発明は下記実施例に限定されるものではない。   Next, examples of the present invention will be described, but the present invention is not limited to the following examples.

(実施例1)
黒鉛化合物(SECカーボン社製 商品名「SNO−15」、レーザー光回折法により粒度分布を測定した場合に50%径として得られる値:15μm)を用意した。
Example 1
A graphite compound (trade name “SNO-15” manufactured by SEC Carbon Co., Ltd., a value obtained as a 50% diameter when the particle size distribution was measured by a laser diffraction method: 15 μm) was prepared.

次に、pHが10のアンモニア水溶液を用意し、このアンモニア水溶液18gに上記黒鉛化合物0.05gを供給して均一に混合してpH10の混合液を製造し、この混合液を25℃にて60分間に亘って静置して黒鉛化合物をその層面間から剥離し薄片化して薄片化黒鉛を生成し、この薄片化黒鉛が水中に分散してなる薄片化黒鉛分散液を得た。   Next, an aqueous ammonia solution having a pH of 10 is prepared, 0.05 g of the graphite compound is supplied to 18 g of the aqueous ammonia solution and uniformly mixed to produce a mixed solution of pH 10, and the mixed solution is heated at 25 ° C. at 60 ° C. The graphite compound was exfoliated from between the layer surfaces by being allowed to stand for a minute and exfoliated to produce exfoliated graphite, and an exfoliated graphite dispersion liquid in which the exfoliated graphite was dispersed in water was obtained.

なお、薄片化黒鉛分散液中には、黒鉛化合物と推定される沈殿物が残っていたので沈殿物のない上方部分を採取し、薄片化黒鉛分散液とした。薄片化黒鉛分散液は目視にて略無色透明であった。薄片化黒鉛分散液に波長532nmのレーザー光を照射したところ、散乱光が確認できたため、薄片化黒鉛分散液中には高度に薄片化された薄片化黒鉛が分散していると推定された。   In addition, in the exfoliated graphite dispersion liquid, a precipitate presumed to be a graphite compound remained. Therefore, an upper part without the precipitate was collected to obtain an exfoliated graphite dispersion liquid. The exfoliated graphite dispersion was substantially colorless and transparent by visual observation. When the exfoliated graphite dispersion was irradiated with a laser beam having a wavelength of 532 nm, scattered light could be confirmed. Therefore, it was presumed that exfoliated graphite highly exfoliated was dispersed in the exfoliated graphite dispersion.

薄片化黒鉛分散液の上方部分から試験液を3cm3採取し、この試験液を25℃にて24時間に亘って静置したが沈殿物は生成しなかった。 3 cm 3 of the test solution was sampled from the upper part of the exfoliated graphite dispersion, and this test solution was allowed to stand at 25 ° C. for 24 hours, but no precipitate was produced.

又、薄片化黒鉛分散液の上方部分から塗布液を3cm3採取し、この塗布液をガラス板上に塗布し90℃にて乾燥させて薄片化黒鉛からなる薄膜を形成した。この薄片化黒鉛からなる薄膜は、銀灰色で且つ透明性が高かった。 Further, 3 cm 3 of the coating solution was sampled from the upper part of the exfoliated graphite dispersion, and this coating solution was applied onto a glass plate and dried at 90 ° C. to form a thin film made of exfoliated graphite. The thin film made of exfoliated graphite was silver gray and highly transparent.

一方、天然モンモリロナイトである層状珪酸塩(クニミネ工業社製 商品名「クニピアP」)5gを水95gに供給して均一に混合して層状珪酸塩分散液を作製した。   On the other hand, 5 g of layered silicate (trade name “Kunipia P” manufactured by Kunimine Kogyo Co., Ltd.), which is natural montmorillonite, was supplied to 95 g of water and mixed uniformly to prepare a layered silicate dispersion.

そして、層状珪酸塩分散液をフィルター上に供給して濾過することによって水を除去し、フィルター上に層状に堆積した層状珪酸塩を乾燥させることによって厚みが0.2mmの層状珪酸塩層を形成した。   Then, the layered silicate dispersion is supplied onto the filter and filtered to remove water, and the layered silicate deposited in layers on the filter is dried to form a layered silicate layer having a thickness of 0.2 mm. did.

次に、上記フィルター上に形成した層状珪酸塩層上に上記薄片化黒鉛分散液を層状に塗布して乾燥させることによって厚みが0.4mmの薄片化黒鉛層を形成した。   Next, the exfoliated graphite layer having a thickness of 0.4 mm was formed by applying the exfoliated graphite dispersion liquid in layers on the layered silicate layer formed on the filter and drying it.

続いて、上記薄片化黒鉛層上に層状珪酸塩分散液を層状に塗布して乾燥させることによって層状珪酸塩層を形成し、薄片化黒鉛層1の両面のそれぞれに層状珪酸塩層2、2が積層一体化されてなる複合シートAを製造した。   Subsequently, a layered silicate dispersion is applied in layers on the exfoliated graphite layer and dried to form a layered silicate layer, and the layered silicate layers 2, 2 are formed on both sides of the exfoliated graphite layer 1, respectively. A composite sheet A was manufactured by laminating and integrating.

(実施例2)
黒鉛化合物(SECカーボン社製 商品名「SNO−15」、レーザー光回折法により粒度分布を測定した場合に50%径として得られる値:15μm、ESCAにより測定した黒鉛化合物中の酸素原子の含有率:2.9%)を用意した。
(Example 2)
Graphite compound (trade name “SNO-15” manufactured by SEC Carbon Co., a value obtained as a 50% diameter when the particle size distribution is measured by a laser diffraction method: 15 μm, the content of oxygen atoms in the graphite compound measured by ESCA : 2.9%).

次に、テトラヒドロフランを用意し、このテトラヒドロフラン18gに上記黒鉛化合物 0.1gを供給して混合して被処理液を作製した。この被処理液を入れた容器を手で把持して上下方向に振ることによって容器内の被処理液を振とうさせて黒鉛化合物をその層面間から剥離し薄片化して薄片化黒鉛を生成し、この薄片化黒鉛がテトラヒドロフラン中に分散してなる薄片化黒鉛分散液を製造した。   Next, tetrahydrofuran was prepared, and 0.1 g of the graphite compound was supplied to 18 g of tetrahydrofuran and mixed to prepare a liquid to be treated. The container containing the liquid to be treated is manually grasped and shaken in the vertical direction to shake the liquid to be treated in the container, and the graphite compound is exfoliated between the layer surfaces to produce exfoliated graphite. A exfoliated graphite dispersion was prepared by dispersing the exfoliated graphite in tetrahydrofuran.

なお、薄片化黒鉛分散液中には、黒鉛化合物と推定される沈殿物が残っていたので沈殿物のない上方部分を採取し、薄片化黒鉛分散液とした。薄片化黒鉛分散液は目視にて透明度の高い黒銀色であり、薄片化黒鉛分散液中には高度に薄片化された薄片化黒鉛が分散していると推定された。   In addition, in the exfoliated graphite dispersion liquid, a precipitate presumed to be a graphite compound remained. Therefore, an upper part without the precipitate was collected to obtain an exfoliated graphite dispersion liquid. The exfoliated graphite dispersion was visually black and black with high transparency, and it was presumed that exfoliated graphite highly exfoliated was dispersed in the exfoliated graphite dispersion.

薄片化黒鉛分散液の上方部分から試験液を3cm3採取し、この試験液を25℃にて24時間に亘って静置したが沈殿物は生成しなかった。 3 cm 3 of the test solution was sampled from the upper part of the exfoliated graphite dispersion, and this test solution was allowed to stand at 25 ° C. for 24 hours, but no precipitate was produced.

又、薄片化黒鉛分散液の上方部分から塗布液を3cm3採取し、この塗布液をガラス板上に塗布し90℃にて乾燥させて薄片化黒鉛からなる薄膜を形成した。この薄片化黒鉛からなる薄膜は、薄灰色で且つ透明性が高かった。 Further, 3 cm 3 of the coating solution was sampled from the upper part of the exfoliated graphite dispersion, and this coating solution was applied onto a glass plate and dried at 90 ° C. to form a thin film made of exfoliated graphite. The thin film made of exfoliated graphite was light gray and highly transparent.

上記薄片化黒鉛分散液を用いたこと以外は実施例1の要領で複合シートAを得た。   A composite sheet A was obtained in the same manner as in Example 1 except that the exfoliated graphite dispersion was used.

(実施例3)
黒鉛化合物(XGSience社製 商品名「XGnP−5」、レーザー光回折法により粒度分布を測定した場合に50%径として得られる値:5μm)を用意した。
(Example 3)
A graphite compound (trade name “XGnP-5” manufactured by XGSense, Inc., a value obtained as a 50% diameter when the particle size distribution is measured by a laser diffraction method: 5 μm) was prepared.

次に、pHが9の水酸化ナトリウム水溶液を用意し、この水酸化ナトリウム水溶液18gに上記黒鉛化合物0.05gを供給して均一に混合してpH14の混合液を製造し、この混合液を25℃にて60分間に亘って静置して黒鉛化合物をその層面間から剥離し薄片化して、薄片化黒鉛が水中に分散してなる薄片化黒鉛分散液を得た。薄片化黒鉛分散液中には沈殿物は生じていなかった。   Next, a sodium hydroxide aqueous solution having a pH of 9 is prepared, 0.05 g of the above graphite compound is supplied to 18 g of this sodium hydroxide aqueous solution and uniformly mixed to produce a mixed solution of pH 14, and this mixed solution is 25 The graphite compound was peeled from the surface of the layers by being allowed to stand at 60 ° C. for 60 minutes and exfoliated to obtain an exfoliated graphite dispersion in which exfoliated graphite was dispersed in water. No precipitate was formed in the exfoliated graphite dispersion.

薄片化黒鉛分散液から試験液を3cm3採取し、この試験液を25℃にて24時間に亘って静置したが沈殿物は生成しなかった。 3 cm 3 of the test solution was sampled from the exfoliated graphite dispersion, and this test solution was allowed to stand at 25 ° C. for 24 hours, but no precipitate was produced.

又、薄片化黒鉛分散液から塗布液を3cm3採取し、この塗布液をガラス板上に塗布し90℃にて乾燥させて薄片化黒鉛からなる薄膜を形成した。この薄片化黒鉛からなる薄膜は、薄灰色で且つ透明性が高かった。 Also, 3 cm 3 of the coating solution was sampled from the exfoliated graphite dispersion, and this coating solution was applied on a glass plate and dried at 90 ° C. to form a thin film made of exfoliated graphite. The thin film made of exfoliated graphite was light gray and highly transparent.

上記薄片化黒鉛分散液を用いたこと以外は実施例1の要領で複合シートAを得た。   A composite sheet A was obtained in the same manner as in Example 1 except that the exfoliated graphite dispersion was used.

(比較例1)
天然モンモリロナイトである層状珪酸塩(クニミネ工業社 商品名「クニピアP」)1gを蒸留水60gに供給し攪拌して層状珪酸塩が水中に分散してなる分散液を得た。この分散液をトレイ上に供給した上で、このトレイをオーブン内に供給して50℃にて5時間に亘って乾燥させた後、1000℃にて24時間に亘って熱処理を行い、厚さが約0.3mmの層状珪酸塩のみからなる層状珪酸塩シートを得た。この層状珪酸塩シートの一面にカーボンペーストを塗布し厚さ0.1mmの黒鉛層を積層一体化した。次に、上述と同様の要領で層状珪酸塩シートを作製し、この層状珪酸塩シートを上記黒鉛層上に積層一体化して、黒鉛層の両面に層状珪酸塩シートが積層一体化されてなる複合シートを得た。
(Comparative Example 1)
1 g of layered silicate (Kunimine Kogyo Co., Ltd., trade name “Kunipia P”), which is natural montmorillonite, was supplied to 60 g of distilled water and stirred to obtain a dispersion in which the layered silicate was dispersed in water. After supplying this dispersion onto the tray, this tray was supplied into the oven and dried at 50 ° C. for 5 hours, and then heat treated at 1000 ° C. for 24 hours to obtain a thickness. Obtained a layered silicate sheet consisting only of a layered silicate of about 0.3 mm. A carbon paste was applied to one surface of the layered silicate sheet, and a graphite layer having a thickness of 0.1 mm was laminated and integrated. Next, a layered silicate sheet is prepared in the same manner as described above, and this layered silicate sheet is laminated and integrated on the graphite layer, and the layered silicate sheet is laminated and integrated on both sides of the graphite layer. A sheet was obtained.

得られた複合シートの熱伝導性及び絶縁性を下記の要領で測定し、その結果を表1に示した。   The thermal conductivity and insulation of the obtained composite sheet were measured in the following manner, and the results are shown in Table 1.

(熱伝導性)
複合シートの熱伝導度を熱伝導測定器(京都電子社製 商品名「LFA−502」)を用いてレーザーフラッシュ法によって測定した。
(Thermal conductivity)
The thermal conductivity of the composite sheet was measured by a laser flash method using a thermal conductivity measuring device (trade name “LFA-502” manufactured by Kyoto Electronics Co., Ltd.).

(絶縁性)
複合シートの表面抵抗を抵抗測定器(三菱油化社製 商品名「ハイレスタ」)を用いて測定した。
(Insulation)
The surface resistance of the composite sheet was measured using a resistance measuring instrument (trade name “HIRESTA” manufactured by Mitsubishi Yuka Co., Ltd.).

Figure 2011189700
Figure 2011189700

1 薄片化黒鉛層
2 層状珪酸塩層
A 複合シート
1 Exfoliated graphite layer 2 Layered silicate layer A Composite sheet

Claims (4)

黒鉛化合物を薄片化してなる薄片化黒鉛を含む薄片化黒鉛層と、層状珪酸塩を含む層状珪酸塩層とが積層一体化してなることを特徴とする複合シート。 A composite sheet comprising a exfoliated graphite layer containing exfoliated graphite obtained by exfoliating a graphite compound and a layered silicate layer containing a layered silicate laminated and integrated. 二層以上の層状珪酸塩と、薄片化黒鉛層とが積層一体化しており、最外層が共に上記層状珪酸塩層から構成されていることを特徴とする請求項1に記載の複合シート。 The composite sheet according to claim 1, wherein two or more layered silicates and exfoliated graphite layers are laminated and integrated, and both outermost layers are composed of the layered silicate layers. 薄片化黒鉛層の両面のそれぞれに層状珪酸塩層が積層一体化されてなることを特徴とする請求項1に記載の複合シート。 The composite sheet according to claim 1, wherein a layered silicate layer is laminated and integrated on each of both surfaces of the exfoliated graphite layer. 薄片化黒鉛層の一面に層状珪酸塩層が積層一体化されていることを特徴とする請求項1に記載の複合シート。 The composite sheet according to claim 1, wherein a layered silicate layer is laminated and integrated on one surface of the exfoliated graphite layer.
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