JPH08157850A - Electroviscous fluid - Google Patents
Electroviscous fluidInfo
- Publication number
- JPH08157850A JPH08157850A JP6303714A JP30371494A JPH08157850A JP H08157850 A JPH08157850 A JP H08157850A JP 6303714 A JP6303714 A JP 6303714A JP 30371494 A JP30371494 A JP 30371494A JP H08157850 A JPH08157850 A JP H08157850A
- Authority
- JP
- Japan
- Prior art keywords
- silicone oil
- modified silicone
- electrorheological
- oil
- hours
- 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
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- Lubricants (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、外部から印加する電圧
により粘性が変化する電気粘性流体に関するもので、エ
ンジンマウント，ショックアブゾーバー，バルブ，アク
チュエータ，クラッチ等に利用される。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrorheological fluid whose viscosity changes with an externally applied voltage and is used for engine mounts, shock absorbers, valves, actuators, clutches and the like.
【０００２】[0002]
【従来の技術】この種の従来技術としては、特開平３ー
４７８９６号公報，特開平４ー３４８１９２号公報に示
されるものが知られている。前者は、電気絶縁性を有す
る油状媒体中に、コールタールピッチ又は石油ピッチを
熱処理することにより生成する光学的異方性小球体をピ
ッチ成分から分別することにより得られた炭素質粉体を
分散したものである。又、後者は、電気絶縁性を有する
油状媒体中に、ポリアニリン粉末を熱処理して得られた
炭素質粉体を分散したものである。ここで、上記した２
つの炭素質粉体は芳香族多環の分子構造となっているた
め、外部から電圧を印加すると電子分極が生じ、その結
果微粒子又は粉体間の結合力を向上させて電気粘性効果
を得ようとしている。2. Description of the Related Art As conventional techniques of this kind, those disclosed in Japanese Patent Laid-Open Nos. 3-47896 and 4-348192 are known. The former is a dispersion of carbonaceous powder obtained by separating optically anisotropic small spheres produced by heat treatment of coal tar pitch or petroleum pitch from the pitch component in an oil medium having electrical insulation. It was done. The latter is a dispersion of carbonaceous powder obtained by heat-treating polyaniline powder in an oil medium having electrical insulation properties. Here, the above 2
Since the two carbonaceous powders have an aromatic polycyclic molecular structure, electronic polarization occurs when an external voltage is applied, and as a result, the binding force between fine particles or powders should be improved to obtain the electrorheological effect. I am trying.
【０００３】また、特開平３ー１５７４９８号公報に
は、電気絶縁性を有する油状媒体中に上記炭素質粉体等
の有機又は無機質粉体を分散してなる電気粘性流体にお
いて、エーテル結合を有する化合物の１種又は２種以上
を添加することで電気粘性効果を向上させることが記載
されている。そして、特開平５ー５９３８３号公報に
は、電気絶縁性を有する油状媒体中に上記炭素質粉体を
分散してなる電気粘性流体において、アミノ変性シリコ
ーンオイル、ポリエーテル変性シリコーンオイル等の界
面活性剤を添加し分散状態を良くすることが記載されて
いる。Further, in Japanese Patent Laid-Open No. 157498/1993, there is an ether bond in an electrorheological fluid obtained by dispersing an organic or inorganic powder such as the carbonaceous powder in an electrically insulating oily medium. It is described that the electrorheological effect is improved by adding one or more compounds. Further, in JP-A-5-59383, in an electrorheological fluid obtained by dispersing the above-mentioned carbonaceous powder in an oil medium having electrical insulation, the surface activity of amino-modified silicone oil, polyether-modified silicone oil, etc. It is described that an agent is added to improve the dispersion state.
【０００４】[0004]
【発明が解決しようとする課題】ところが、芳香族多環
部の電子分極だけでは炭素質粉体間の結合力が未だ不十
分であり、電圧を印加したときの電気粘性効果が未だ小
さいことに鑑み、本発明者等は、電気絶縁性を有する油
状媒体中に、リグニンスルホン酸塩を熱処理して得られ
た粉末を分散してなる電気粘性流体を発明し特許出願し
た（特願平５−２１４５７６号）。リグニンスルホン酸
塩を熱処理して得られた粉末は電圧を印加すると、縮合
多環部の電子分極だけでなくスルホン酸塩のイオン分極
が生じて互いが相乗され、その結果、上記の従来技術と
比較して前記粉末間の結合力が増大し、電気粘性効果が
大きくなるものである。しかし、実用に供するための電
気粘性効果とするためには更に改善することが必要であ
った。However, the binding force between carbonaceous powders is still insufficient only by electronic polarization of the aromatic polycyclic portion, and the electrorheological effect when a voltage is applied is still small. In view of the above, the present inventors have invented an electrorheological fluid obtained by dispersing powder obtained by heat treatment of lignin sulfonate in an oil medium having electrical insulation properties, and filed a patent application (Japanese Patent Application No. No. 214576). When a voltage is applied to the powder obtained by heat-treating the lignin sulfonate, not only the electronic polarization of the condensed polycyclic part but also the ionic polarization of the sulfonate is generated to synergize with each other. In comparison, the binding force between the powders is increased and the electrorheological effect is increased. However, further improvement was necessary to obtain the electrorheological effect for practical use.
【０００５】本発明は、リグニンスルホン酸塩を熱処理
して得られた粉末を分散してなる電気粘性流体の電気粘
性効果を更に向上させることを、その技術的課題とする
ものである。The present invention has its technical problem to further improve the electrorheological effect of an electrorheological fluid obtained by dispersing powder obtained by heat-treating a lignin sulfonate.
【０００６】[0006]
【課題を解決するための手段】上記技術的課題を解決す
るために本発明において講じた技術的手段は、電気絶縁
性を有する油状媒体中に、リグニンスルホン酸塩を熱処
理して得られた粉末を分散してなる電気粘性流体であっ
て、反応基を有する変性シリコーンオイルとエーテル結
合を有する変性シリコーンオイルの両者を添加した電気
粘性流体を提供することである。The technical means taken in the present invention to solve the above technical problems is a powder obtained by heat-treating lignin sulfonate in an oily medium having electrical insulation. An object of the present invention is to provide an electrorheological fluid in which both modified silicone oil having a reactive group and modified silicone oil having an ether bond are added.
【０００７】ここで、リグニンスルホン酸塩において、
スルホン基の陽イオンの種類は特にに限定される必要は
ないが、スルホン基の陽イオンしては、水素，リチウ
ム，ナトリウム，カリウム等のアルカリ金属のイオン；
マグネシウム，カルシウム等のアルカリ土類金属のイオ
ン；アルミニウム等の３Ａ族金属のイオン；スズ，鉛等
の４Ａ族金属のイオン；亜鉛，鉄，銅，コバルト，ニッ
ケル等の遷移金属のイオン；アンモニウム，有機４級ア
ンモニウム，ピリジニウム，グアジニウム等の有機物陽
イオン等が挙げられる。Here, in the lignin sulfonate,
The kind of the cation of the sulfone group is not particularly limited, but as the cation of the sulfone group, an ion of an alkali metal such as hydrogen, lithium, sodium or potassium;
Ions of alkaline earth metals such as magnesium and calcium; ions of 3A group metals such as aluminum; ions of 4A group metals such as tin and lead; ions of transition metals such as zinc, iron, copper, cobalt, nickel; ammonium, Examples include organic cations such as organic quaternary ammonium, pyridinium, and guanidinium.
【０００８】電気絶縁性を有する油状媒体としては、特
に限定される必要はないが、シリコーン油，鉱物油，パ
ラフィン油，ハロゲン化芳香族油，フッ素変性シリコー
ン油，フッ素系油，熱媒油等が挙げられる。The oily medium having electric insulation is not particularly limited, but silicone oil, mineral oil, paraffin oil, halogenated aromatic oil, fluorine-modified silicone oil, fluorine oil, heat carrier oil, etc. Is mentioned.
【０００９】反応基を有する変成シリコーンオイルとし
ては、アミノ変性シリコーンオイル，エポキシ変性シリ
コーンオイル，カルボキシル変性シリコーンオイル，ア
ルコール変性シリコーンオイル等が挙げられるが、アミ
ノ変性シリコーンオイルが好適である。Examples of the modified silicone oil having a reactive group include amino-modified silicone oil, epoxy-modified silicone oil, carboxyl-modified silicone oil, alcohol-modified silicone oil and the like, and amino-modified silicone oil is preferable.
【００１０】エーテル結合を有する変性シリコーンオイ
ルとしては、ポリエーテル変性シリコーンオイル等が挙
げられるが、ポリエーテル変性シリコーンオイルが好適
である。Examples of the modified silicone oil having an ether bond include polyether modified silicone oil and the like, and polyether modified silicone oil is preferable.
【００１１】上記の電気粘性流体の製造方法を以下に示
す。リグニンスルホン酸塩を焼成した後、粉砕し外径の
小さいものだけを取り出す。次に、乾燥してリグニンス
ルホン酸塩の分散粒子を生成し、その分散粒子と反応基
を有する変成シリコーンオイル及びエーテル結合を有す
る変性シリコーンオイルを電気絶縁性を有する油状媒体
中に分散して上記の電気粘性流体を得る。A method for producing the above electrorheological fluid will be described below. After firing the lignin sulfonate, it is crushed and only those with a small outer diameter are taken out. Next, it is dried to form dispersed particles of lignin sulfonate, and the dispersed particles, the modified silicone oil having a reactive group and the modified silicone oil having an ether bond are dispersed in an oil medium having electrical insulation to obtain the above-mentioned product. To obtain the electrorheological fluid of.
【００１２】[0012]
【作用】上記技術的手段によれば、リグニンスルホン酸
塩を熱処理して得られた粉末は電圧を印加すると、縮合
多環部の電子分極だけでなくスルホン酸塩のイオン分極
が生じて互いが相乗される。その結果、従来技術と比較
して前記粉末間の結合力が増大し、電気粘性効果が大き
くなる。加えて、アミノ変性がポリエーテル変性のシリ
コーンオイルへの溶解性を改善することで、両変性シリ
コーンオイルの持つ極性により、粒子の誘電率等を変化
させ、電気粘性効果が更に向上される。According to the above technical means, when a voltage is applied to the powder obtained by heat-treating the lignin sulfonate, not only the electronic polarization of the condensed polycyclic portion but also the ionic polarization of the sulfonate is generated, so that they are mutually separated. Be synergistic. As a result, the binding force between the powders is increased and the electrorheological effect is increased as compared with the prior art. In addition, the amino modification improves the solubility of the polyether-modified silicone oil in the silicone oil, thereby changing the dielectric constant of the particles depending on the polarities of both modified silicone oils and further improving the electrorheological effect.
【００１３】[0013]
【実施例】以下、本発明の実施例及び比較例を具体的に
説明する。EXAMPLES Examples and comparative examples of the present invention will be specifically described below.
【００１４】〔実施例１〕市販のリグニンスルホン酸ナ
トリウム（日本製紙（株）製「バニレックスＲＮ）を空
気雰囲気中で４２５℃で４時間焼成してリグニンスルホ
ン酸ナトリウム焼成物を生成した。次に、ボールミルに
より粉砕し、外径が６３μｍ以下の微粒子のみを取り出
し、真空中で２００℃で５時間乾燥した。次に、乾燥し
た微粒子を３０倍量の脱イオン水中に入れ６時間攪拌し
た後、濾過して微粒子のみを採集した。この水洗浄処理
を３回行った後、真空中で２００℃で５時間乾燥して分
散粒子を得た。その後、分散粒子４０重量部、シリコー
ンオイル（東レ・ダウコーニング・シリコーン（株）製
「ＳＨ２００−５０ｃｓｔ」）６０重量部、アミノ変性
シリコーンオイル（東レ・ダウコーニング・シリコーン
（株）製「ＳＦ８４１７」）０．８重量部、ポリエーテ
ル変性シリコーンオイル（日本ユニカー（株）製「ＦＺ
−２１１０」）０．４重量部を混合した後、ボールミル
により分散粒子をシリコーンオイルに均一分散させて電
気粘性流体を得た。Example 1 Commercially available sodium ligninsulfonate (Vanilex RN manufactured by Nippon Paper Industries Co., Ltd.) was fired at 425 ° C. for 4 hours in an air atmosphere to produce a fired sodium ligninsulfonate. After crushing with a ball mill, only fine particles having an outer diameter of 63 μm or less were taken out and dried in vacuum for 5 hours at 200 ° C. Next, the dried fine particles were put in 30 times the volume of deionized water and stirred for 6 hours, Only the fine particles were collected by filtration, washed with water three times, and then dried in vacuum at 200 ° C. for 5 hours to obtain dispersed particles, after which 40 parts by weight of dispersed particles and silicone oil (Toray. 60 parts by weight of "SH200-50cst" manufactured by Dow Corning Silicone Co., Ltd., amino-modified silicone oil (SF8 manufactured by Toray Dow Corning Silicone Co., Ltd.) 17 ") 0.8 parts by weight of polyether-modified silicone oil (manufactured by Nippon Unicar Company Limited" FZ
-2110 ") 0.4 part by weight was mixed, and then the dispersed particles were uniformly dispersed in silicone oil by a ball mill to obtain an electrorheological fluid.
【００１５】この電気粘性流体の電気粘性特性を以下の
ように測定した。内径１８ｍｍのシリンダに電気粘性流
体を入れ、その中に外径１６ｍｍ，長さ２０ｍｍのロー
タを沈めた。そして、回転数３００ｒｐｍでシリンダを
回転しながら、一定電圧を印加し、その時に発生する誘
起剪断応力及び電流密度を測定した。また、電圧を印加
しない状態で回転数を５０〜４５０ｒｐｍの間で変化さ
せたときの基底粘度を測定した。The electrorheological characteristics of this electrorheological fluid were measured as follows. An electrorheological fluid was put into a cylinder having an inner diameter of 18 mm, and a rotor having an outer diameter of 16 mm and a length of 20 mm was immersed therein. Then, a constant voltage was applied while rotating the cylinder at a rotation speed of 300 rpm, and the induced shear stress and current density generated at that time were measured. Further, the base viscosity was measured when the rotation speed was changed between 50 and 450 rpm without applying a voltage.
【００１６】上記の測定結果を図１，図２，図３に示
す。即ち、電界強度（ｋＶ／ｍｍ）と電気粘性流体の剪
断応力（ｋＰａ）との関係を図１に示し、電界強度（ｋ
Ｖ／ｍｍ）と電気粘性流体の電流密度（μＡ／ｃｍ2 ）
との関係を図２に示し、回転数（ｒｐｍ）と基底粘度
（ｐｏｉｓｅ）との関係を図３に示す。The above measurement results are shown in FIGS. 1, 2 and 3. That is, the relationship between the electric field strength (kV / mm) and the shear stress (kPa) of the electrorheological fluid is shown in FIG.
V / mm) and current density of electrorheological fluid (μA / cm 2 )
2 is shown in FIG. 2, and the relationship between the rotational speed (rpm) and the base viscosity (poise) is shown in FIG.
【００１７】〔実施例２〕市販のリグニンスルホン酸ナ
トリウム（日本製紙（株）製「バニレックスＲＮ）を空
気雰囲気中で４２５℃で４時間焼成してリグニンスルホ
ン酸ナトリウム焼成物を生成した。次に、ボールミルに
より粉砕し、外径が６３μｍ以下の微粒子のみを取り出
し、真空中で２００℃で５時間乾燥した。次に、乾燥し
た微粒子を３０倍量の脱イオン水中に入れ６時間攪拌し
た後、濾過して微粒子のみを採集した。この水洗浄処理
を３回行った後、真空中で２００℃で５時間乾燥して分
散粒子を得た。その後、分散粒子４０重量部、シリコー
ンオイル（東レ・ダウコーニング・シリコーン（株）製
「ＳＨ２００−５０ｃｓｔ」）６０重量部、アミノ変性
シリコーンオイル（東レ・ダウコーニング・シリコーン
（株）製「ＳＦ８４１７」）１．６重量部、ポリエーテ
ル変性シリコーンオイル（日本ユニカー（株）製「ＦＺ
−２１１０」）０．６重量部を混合した後、ボールミル
により分散粒子をシリコーンオイルに均一分散させて電
気粘性流体を得た。Example 2 Commercially available sodium ligninsulfonate (“Vanilex RN” manufactured by Nippon Paper Industries Co., Ltd.) was fired at 425 ° C. for 4 hours in an air atmosphere to produce a fired sodium ligninsulfonate. After crushing with a ball mill, only fine particles having an outer diameter of 63 μm or less were taken out and dried in vacuum for 5 hours at 200 ° C. Next, the dried fine particles were put in 30 times the volume of deionized water and stirred for 6 hours, Only the fine particles were collected by filtration, washed with water three times, and then dried in vacuum at 200 ° C. for 5 hours to obtain dispersed particles, after which 40 parts by weight of dispersed particles and silicone oil (Toray. 60 parts by weight of "SH200-50cst" manufactured by Dow Corning Silicone Co., Ltd., amino-modified silicone oil (SF8 manufactured by Toray Dow Corning Silicone Co., Ltd.) 17 ") 1.6 parts by weight of polyether-modified silicone oil (manufactured by Nippon Unicar Company Limited" FZ
-2110 ") 0.6 part by weight, and then the dispersed particles were uniformly dispersed in silicone oil by a ball mill to obtain an electrorheological fluid.
【００１８】尚、この電気粘性流体の電気粘性特性（誘
起剪断応力，電流密度，基底粘度）の測定方法は、実施
例１の方法と同様であるので、その説明を省略する。誘
起剪断応力，電流密度，基底粘度の測定結果を夫々図
１，図２，図３に示す。The method for measuring the electrorheological characteristics (induced shear stress, current density, basal viscosity) of this electrorheological fluid is the same as the method of Example 1, and therefore its explanation is omitted. The measurement results of induced shear stress, current density and base viscosity are shown in Fig. 1, Fig. 2 and Fig. 3, respectively.
【００１９】〔比較例１〕市販のリグニンスルホン酸ナ
トリウム（日本製紙（株）製「バニレックスＲＮ）を空
気雰囲気中で４２５℃で４時間焼成してリグニンスルホ
ン酸ナトリウム焼成物を生成した。次に、ボールミルに
より粉砕し、外径が６３μｍ以下の微粒子のみを取り出
し、真空中で２００℃で５時間乾燥した。次に、乾燥し
た微粒子を３０倍量の脱イオン水中に入れ６時間攪拌し
た後、濾過して微粒子のみを採集した。この水洗浄処理
を３回行った後、真空中で２００℃で５時間乾燥して分
散粒子を得た。その後、分散粒子４０重量部、シリコー
ンオイル（東レ・ダウコーニング・シリコーン（株）製
「ＳＨ２００−５０ｃｓｔ」）６０重量部を混合した
後、ボールミルにより分散粒子をシリコーンオイルに均
一分散させて電気粘性流体を得た。[Comparative Example 1] Commercially available sodium lignin sulfonate ("Vanilex RN" manufactured by Nippon Paper Industries Co., Ltd.) was fired at 425 ° C for 4 hours in an air atmosphere to produce a fired sodium lignin sulfonate. After crushing with a ball mill, only fine particles having an outer diameter of 63 μm or less were taken out and dried in vacuum for 5 hours at 200 ° C. Next, the dried fine particles were put in 30 times the volume of deionized water and stirred for 6 hours, Only the fine particles were collected by filtration, washed with water three times, and then dried in vacuum at 200 ° C. for 5 hours to obtain dispersed particles, after which 40 parts by weight of dispersed particles and silicone oil (Toray. After mixing 60 parts by weight of "SH200-50cst" manufactured by Dow Corning Silicone Co., Ltd., the dispersed particles are uniformly dispersed in silicone oil by a ball mill to obtain an electric viscosity. To obtain a fluid.
【００２０】この電気粘性流体の電気粘性特性（誘起剪
断応力，電流密度，基底粘度）の測定方法は、実施例１
の方法と同様であるので、その説明を省略する。誘起剪
断応力，電流密度，基底粘度の測定結果を夫々図１，図
２，図３に示す。The method for measuring the electrorheological properties (induced shear stress, current density, base viscosity) of this electrorheological fluid is described in Example 1.
Since the method is the same as the method described above, the description thereof will be omitted. The measurement results of induced shear stress, current density and base viscosity are shown in Fig. 1, Fig. 2 and Fig. 3, respectively.
【００２１】〔比較例２〕市販のリグニンスルホン酸ナ
トリウム（日本製紙（株）製「バニレックスＲＮ）を空
気雰囲気中で４２５℃で４時間焼成してリグニンスルホ
ン酸ナトリウム焼成物を生成した。次に、ボールミルに
より粉砕し、外径が６３μｍ以下の微粒子のみを取り出
し、真空中で２００℃で５時間乾燥した。次に、乾燥し
た微粒子を３０倍量の脱イオン水中に入れ６時間攪拌し
た後、濾過して微粒子のみを採集した。この水洗浄処理
を３回行った後、真空中で２００℃で５時間乾燥して分
散粒子を得た。その後、分散粒子４０重量部、シリコー
ンオイル（東レ・ダウコーニング・シリコーン（株）製
「ＳＨ２００−５０ｃｓｔ」）６０重量部、アミノ変性
シリコーンオイル（東レ・ダウコーニング・シリコーン
（株）製「ＳＦ８４１７」）０．８重量部を混合した
後、ボールミルにより分散粒子をシリコーンオイルに均
一分散させて電気粘性流体を得た。Comparative Example 2 Commercially available sodium ligninsulfonate (Vanilex RN manufactured by Nippon Paper Industries Co., Ltd.) was fired at 425 ° C. for 4 hours in an air atmosphere to produce a fired sodium ligninsulfonate. After crushing with a ball mill, only fine particles having an outer diameter of 63 μm or less were taken out and dried in vacuum for 5 hours at 200 ° C. Next, the dried fine particles were put in 30 times the volume of deionized water and stirred for 6 hours, Only the fine particles were collected by filtration, washed with water three times, and then dried in vacuum at 200 ° C. for 5 hours to obtain dispersed particles, after which 40 parts by weight of dispersed particles and silicone oil (Toray. 60 parts by weight of "SH200-50cst" manufactured by Dow Corning Silicone Co., Ltd., amino-modified silicone oil (SF8 manufactured by Toray Dow Corning Silicone Co., Ltd.) 17 ") were mixed 0.8 part by weight, was obtained electrorheological fluid dispersed particles was uniformly dispersed in silicone oil in a ball mill.
【００２２】この電気粘性流体の電気粘性特性（誘起剪
断応力，電流密度，基底粘度）の測定方法は、実施例１
の方法と同様であるので、その説明を省略する。誘起剪
断応力，電流密度，基底粘度の測定結果を夫々図１，図
２，図３に示す。The method for measuring the electrorheological characteristics (induced shear stress, current density, base viscosity) of this electrorheological fluid is described in Example 1.
Since the method is the same as the method described above, the description thereof will be omitted. The measurement results of induced shear stress, current density and base viscosity are shown in Fig. 1, Fig. 2 and Fig. 3, respectively.
【００２３】〔比較例３〕市販のリグニンスルホン酸ナ
トリウム（日本製紙（株）製「バニレックスＲＮ）を空
気雰囲気中で４２５℃で４時間焼成してリグニンスルホ
ン酸ナトリウム焼成物を生成した。次に、ボールミルに
より粉砕し、外径が６３μｍ以下の微粒子のみを取り出
し、真空中で２００℃で５時間乾燥した。次に、乾燥し
た微粒子を３０倍量の脱イオン水中に入れ６時間攪拌し
た後、濾過して微粒子のみを採集した。この水洗浄処理
を３回行った後、真空中で２００℃で５時間乾燥して分
散粒子を得た。その後、分散粒子４０重量部、シリコー
ンオイル（東レ・ダウコーニング・シリコーン（株）製
「ＳＨ２００−５０ｃｓｔ」）６０重量部、ポリエーテ
ル変性シリコーンオイル（日本ユニカー（株）製「ＦＺ
−２１１０」）０．６重量部を混合した後、ボールミル
により分散粒子をシリコーンオイルに均一分散させて電
気粘性流体を得た。[Comparative Example 3] Commercially available sodium lignin sulfonate ("Vanilex RN" manufactured by Nippon Paper Industries Co., Ltd.) was fired at 425 ° C for 4 hours in an air atmosphere to produce a fired sodium lignin sulfonate. After crushing with a ball mill, only fine particles having an outer diameter of 63 μm or less were taken out and dried in vacuum for 5 hours at 200 ° C. Next, the dried fine particles were put in 30 times the volume of deionized water and stirred for 6 hours, Only the fine particles were collected by filtration, washed with water three times, and then dried in vacuum at 200 ° C. for 5 hours to obtain dispersed particles, after which 40 parts by weight of dispersed particles and silicone oil (Toray. 60 parts by weight of "SH200-50cst" manufactured by Dow Corning Silicone Co., Ltd., polyether-modified silicone oil ("FZ manufactured by Nippon Unicar Co., Ltd.")
-2110 ") 0.6 part by weight, and then the dispersed particles were uniformly dispersed in silicone oil by a ball mill to obtain an electrorheological fluid.
【００２４】この電気粘性流体の電気粘性特性（誘起剪
断応力，電流密度，基底粘度）の測定方法は、実施例１
の方法と同様であるので、その説明を省略する。誘起剪
断応力，電流密度，基底粘度の測定結果を夫々図１，図
２，図３に示す。The method for measuring the electrorheological characteristics (induced shear stress, current density, base viscosity) of this electrorheological fluid is described in Example 1.
Since the method is the same as the method described above, the description thereof will be omitted. The measurement results of induced shear stress, current density and base viscosity are shown in Fig. 1, Fig. 2 and Fig. 3, respectively.
【００２５】図１から明らかなように、エーテル結合を
有する変性シリコーンオイルとしてのポリエーテル変性
シリコーンオイルを単体で添加した場合（比較例３）に
は、予想に反して、無添加の場合（比較例１）と比べて
印加電圧に対する誘起剪断応力が低くなった。又、反応
基を有する変性シリコーンオイルとしてのアミノ変性シ
リコーンオイルを単体で添加した場合（比較例２）は無
添加の場合（比較例１）と比べて印加電圧に対する誘起
剪断応力が高まった。本発明の実施例１，２の電気粘性
流体では、印加電圧に対する誘起剪断応力が比較例２に
比べて高いものとなった。As is apparent from FIG. 1, when a polyether-modified silicone oil as a modified silicone oil having an ether bond was added alone (Comparative Example 3), unexpectedly, no addition was performed (comparison). The induced shear stress with respect to the applied voltage was lower than in Example 1). In addition, when the amino-modified silicone oil as the modified silicone oil having a reactive group was added alone (Comparative Example 2), the induced shear stress with respect to the applied voltage was increased as compared with the case where no addition was made (Comparative Example 1). In the electrorheological fluids of Examples 1 and 2 of the present invention, the induced shear stress with respect to the applied voltage was higher than that of Comparative Example 2.
【００２６】又、図２から明らかなように、アミノ変性
シリコーンオイルを単体で添加した場合（比較例２）
は、無添加の場合（比較例１）と比べて電界強度に対す
る電流密度が低いものとなった。又、ポリエーテル変性
シリコーンオイルを単体で添加した場合（比較例３）
は、電界強度に対する電流密度が無添加の場合と同等で
あった。本発明の実施例１，２の電気粘性流体では、電
界強度に対する電流密度が無添加の場合と同等であっ
た。As is clear from FIG. 2, when amino-modified silicone oil was added alone (Comparative Example 2).
Has a lower current density with respect to the electric field strength than the case of no addition (Comparative Example 1). When polyether modified silicone oil is added alone (Comparative Example 3)
Was similar to the case where the current density with respect to the electric field strength was not added. In the electrorheological fluids of Examples 1 and 2 of the present invention, the current density with respect to the electric field strength was the same as in the case of no addition.
【００２７】更に、図３から明らかなように、ポリエー
テル変性シリコーンオイルを単体で添加した場合（比較
例３）は、予想に反して、無添加の場合（比較例１）と
比べて回転数に対する基底粘度が同等であった。アミノ
変性シリコーンオイルを単体で添加した場合（比較例
２）は回転数に対する基底粘度が大幅に低くなった。本
発明の実施例１，２の電気粘性流体では、回転数に対す
る基底粘度が比較例，２までは低くならなかったが、比
較例１，３に比べると大幅に低くなった。Further, as is apparent from FIG. 3, when the polyether-modified silicone oil was added alone (Comparative Example 3), contrary to the expectation, the number of rotations was higher than that in the case without addition (Comparative Example 1). The basal viscosities for When the amino-modified silicone oil was added alone (Comparative Example 2), the base viscosity with respect to the rotation speed was significantly reduced. In the electrorheological fluids of Examples 1 and 2 of the present invention, the base viscosity with respect to the rotation speed did not decrease until Comparative Examples 1 and 2, but was significantly lower than that of Comparative Examples 1 and 3.
【００２８】図１，図２，図３から明らかなように、電
気粘性効果の程度を表す３つ指標、つまり印加電圧に対
する誘起剪断応力（高い方が良い）、電界強度に対する
電流密度（低い方が良い）、回転数に対する基底粘度
（低い方が良い）に関して、ポリエーテル変性シリコー
ンオイルを単体で添加した場合には、無添加の場合に比
べて３指標とも向上するものではない。また、アミノ変
性シリコーンオイルを単体で添加した場合には、無添加
の場合に比べて３指標とも向上する。これに対して、本
発明の実施例１，２は、無添加の場合より劣化すること
なく、更に誘起剪断応力を向上するものである。As is apparent from FIGS. 1, 2 and 3, three indices showing the degree of the electrorheological effect, that is, the induced shear stress with respect to the applied voltage (higher is better) and the current density with respect to the electric field strength (lower) However, regarding the base viscosity with respect to the number of revolutions (the lower the better), when the polyether-modified silicone oil is added alone, none of the three indices is improved as compared with the case where no addition is made. In addition, when the amino-modified silicone oil is added alone, all three indices are improved compared to the case where no amino-modified silicone oil is added. On the other hand, Examples 1 and 2 of the present invention further improve the induced shear stress without deteriorating as compared with the case of no addition.
【００２９】[0029]
【発明の効果】本発明は、以下の如く効果を有する。The present invention has the following effects.
【００３０】電圧を印加すると、縮合多環部の電子分極
だけでなくスルホン酸塩のイオン分極が生じて互いが相
乗される。その結果、従来技術と比較して前記粉末間の
結合力が増大し、電気粘性効果が大きくなる。加えて、
アミノ変性がポリエーテル変性のシリコーンオイルへの
溶解性を改善することで、両変性シリコーンオイルの持
つ極性により、粒子の誘電率等を変化させ、電気粘性効
果が更に向上される。When a voltage is applied, not only the electronic polarization of the condensed polycyclic portion but also the ionic polarization of the sulfonate is generated, and the two are synergistic with each other. As a result, the binding force between the powders is increased and the electrorheological effect is increased as compared with the prior art. in addition,
The amino modification improves the solubility of the polyether-modified silicone oil in the silicone oil, thereby changing the dielectric constant of the particles depending on the polarities of the both modified silicone oils and further improving the electrorheological effect.
【００３１】電流密度の劣化なしに、基底粘度と誘起剪
断応力の著しい改善が得られる。Significant improvements in base viscosity and induced shear stress are obtained without current density degradation.
【図１】本発明の実施例１，２と比較例１〜３の電気粘
性流体における電界強度と誘起剪断応力との関係を示す
グラフである。FIG. 1 is a graph showing the relationship between electric field strength and induced shear stress in electrorheological fluids of Examples 1 and 2 of the present invention and Comparative Examples 1 to 3.
【図２】本発明の実施例１，２と比較例１〜３の電気粘
性流体における電界強度と電流密度との関係を示すグラ
フである。FIG. 2 is a graph showing the relationship between electric field strength and current density in electrorheological fluids of Examples 1 and 2 of the present invention and Comparative Examples 1 to 3.
【図３】本発明の実施例１，２と比較例１〜３の電気粘
性流体における回転数と基底粘度との関係を示すグラフ
である。FIG. 3 is a graph showing the relationship between the rotational speed and the base viscosity of the electrorheological fluids of Examples 1 and 2 of the present invention and Comparative Examples 1 to 3.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ１０Ｎ 40:14 70:00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location C10N 40:14 70:00
Claims (1)
ニンスルホン酸塩を熱処理して得られた粉末を分散して
なる電気粘性流体であって、反応基を有する変性シリコ
ーンオイルとエーテル結合を有する変性シリコーンオイ
ルの両者を添加したことを特徴とする電気粘性流体。1. An electrorheological fluid obtained by dispersing a powder obtained by heat-treating a lignin sulfonate in an oil medium having electrical insulation, which comprises a modified silicone oil having a reactive group and an ether bond. An electrorheological fluid, characterized in that both modified silicone oils are added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6303714A JPH08157850A (en) | 1994-12-07 | 1994-12-07 | Electroviscous fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6303714A JPH08157850A (en) | 1994-12-07 | 1994-12-07 | Electroviscous fluid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08157850A true JPH08157850A (en) | 1996-06-18 |
Family
ID=17924376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6303714A Pending JPH08157850A (en) | 1994-12-07 | 1994-12-07 | Electroviscous fluid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08157850A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0964053A2 (en) * | 1998-06-08 | 1999-12-15 | Bridgestone Corporation | Electrorheological fluid |
| JP2019070447A (en) * | 2015-12-04 | 2019-05-09 | 旭化成株式会社 | Electroviscous fluid and electric device |
-
1994
- 1994-12-07 JP JP6303714A patent/JPH08157850A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0964053A2 (en) * | 1998-06-08 | 1999-12-15 | Bridgestone Corporation | Electrorheological fluid |
| EP0964053A3 (en) * | 1998-06-08 | 2001-05-30 | Bridgestone Corporation | Electrorheological fluid |
| US6352651B1 (en) | 1998-06-08 | 2002-03-05 | Bridgestone Corporation | Electrorheological fluid |
| JP2019070447A (en) * | 2015-12-04 | 2019-05-09 | 旭化成株式会社 | Electroviscous fluid and electric device |
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