公开(公告)号：JPH06330078A

公开(公告)日：1994-11-29

申请号：JP11827993

申请日：1993-05-20

Applicant: KAWASAKI STEEL CO ,  BRIDGESTONE CORP

Inventor： TAKAGI KO ,  HARAOKA TAKUJI ,  HATANO HITOMI ,  FUKUDA NORIYOSHI ,  MARUYAMA TAKAYUKI ,  SAITO TASUKU ,  OGINO TAKAO

IPC: B01J13/00 ,  C10M169/04 ,  C10M171/00 ,  C10N20/06 ,  C10N30/02 ,  C10N40/14

Abstract: PURPOSE:To stably obtain are electroviscous fluid responding to various prescribed properties such as a small current value and a great change in viscosity in applying a voltage thereto by mixing plural kinds of electroviscous fluids with dielectric particles different in electrical characteristics. CONSTITUTION:A electroviscous fluid is prepared by dispersing plural kinds of dielectric particles dispersed in an oily medium (e.g. transformer oil) excellent in electrical insulating properties. In the process, electroviscous fluids and/or dielectric particles having the maximum value (f0.max) and the minimum value (f0.min) in relaxation frequencies (f0) of an electroviscous fluid prepared by using one kind each of the plural dielectric particles alone satisfying the relationship of the formula are mixed. Specifically, the electroviscous fluid is prepared according to, e.g. a method for mutually mixing the plural kinds of electroviscous fluids or mixing the plural kinds of dielectric particles and then dispersing the mixed dielectric particles in the oily medium. Furthermore, the oily medium in the plural kinds of electroviscous fluids is preferably the same. Carbonaceous powder consisting essentially of carbon is preferred as the dielectric particles.

公开(公告)号：JPH06299181A

公开(公告)日：1994-10-25

申请号：JP4971993

申请日：1993-03-11

Applicant: KAWASAKI STEEL CO ,  BRIDGESTONE CORP

Inventor： HARAOKA TAKUJI ,  TORII TAKAYUKI ,  NAGAYAMA KATSUHIRO ,  HATANO HITOMI ,  TAKAGI KO ,  FUKUDA NORIYOSHI ,  ISHINO YUICHI ,  MARUYAMA TAKAYUKI ,  SAITO TASUKU ,  OGINO TAKAO

IPC: C01B31/02 ,  C09C1/48 ,  C09C1/56 ,  C10M125/02 ,  C10N20/06 ,  C10N30/00 ,  C10N40/14 ,  C10N70/00

Abstract: PURPOSE:To stably obtain high-quality carbonaceous powder for an electroviscous fluid without any rise in current value in applying a voltage by heat-treating tar, pitch, a resin, etc., regulating a value of carbonization ratio, then suppressing an increase in oxygen content of the resultant product to a specific value or below, pulverizing the prepared product and classifying the powder. CONSTITUTION:An organic compound such as coal-based tar, coal-based pitch, petroleum-based tar, petroleum-based pitch, a resin and a polymer of a condensed aromatic compound is heat-treated to regulate a value of carbonization ratio (C/H) which is the ratio of the number of carbon atoms to that of hydrogen atoms within the range of 2.00 to 3.50. The resultant substance obtained by the heat treatment is then pulverized and classified by suppressing an increase in oxygen content to

公开(公告)号：JPH06263417A

公开(公告)日：1994-09-20

申请号：JP4962293

申请日：1993-03-10

Applicant: KAWASAKI STEEL CO ,  BRIDGESTONE CORP

Inventor： HATANO HITOMI ,  HARAOKA TAKUJI ,  TAKAGI KO ,  FUKUDA NORIYOSHI ,  OGINO TAKAO ,  MARUYAMA TAKAYUKI ,  SAITO TASUKU

IPC: C01B31/02 ,  C10M169/04 ,  C10N20/00 ,  C10N20/06 ,  C10N40/14

Abstract: PURPOSE:To provide a carbonaceous powder for electroviscous fluid low in current value, a production method and an electroviscous fluid. CONSTITUTION:In the carbonaceous powder for electroviscous fluid >=1.70 to =0.5% to =400 deg.C to

公开(公告)号：JPH06158082A

公开(公告)日：1994-06-07

申请号：JP33383592

申请日：1992-11-20

Applicant: BRIDGESTONE CORP

Inventor： MIYANO MARI ,  ENDO SHIGEKI ,  ISHINO YUICHI ,  OSAKI TOSHIYUKI ,  SAITO TASUKU

IPC: C10M169/04 ,  C08L83/04 ,  C10N30/02 ,  C10N40/14

Abstract: PURPOSE:To obtain an electroviscous fluid having a high electroviscous effect, reduced in the precipitation of disperse phase, and excellent in long-term stability, temperature characteristics and a response to an applied electric field. CONSTITUTION:This electroviscous fluid is prepared by suspending a disperse phase comprising dielectric particles in a liquid phase comprising an oily medium consisting of a copolymer of 50-90mol% dimethylsiloxane with 10-50mol% 3,3,3- trifluoropropylmethylsiloxane and having a volume resistivity of 10 OMEGA.cm or above. Alternately, a disperse phase comprising dielectric particles is dispersed in a liquid phase comprising a mixture of the above copolymer with a dimethylsiloxane homopolymer and having a ratio of the number of the 3,3,3- trufluoropropylmethylsiloxane units to the total number of the 3,3,3- trifluoropropylmethylsiloxane units and the dimethylsiloxane units in the range of 0.1-0.5.

公开(公告)号：JPH0649477A

公开(公告)日：1994-02-22

申请号：JP20562092

申请日：1992-07-31

Applicant: BRIDGESTONE CORP

Inventor： OSAKI TOSHIYUKI ,  ISHINO YUICHI ,  SAITO TASUKU

IPC: B29C33/40 ,  C08J9/40 ,  C10M169/04 ,  C10N30/00 ,  C10N40/06 ,  C10N40/14 ,  F16F13/30

Abstract: PURPOSE:To provide an electroviscous fluid-holding non-sedimentary porous form having stable electroviscous fluid characteristics for a long period of time without impairing its performance, and to provide an electroviscous fluid- applied device having the above porous form. CONSTITUTION:The porous form characterized by consisting of a flexible open cell-type porous form such as non-membrane polyurethane foam, having specific pore size, impregnated with an electroviscous fluid composed of disperse phase powder such as carbonaceous powder and electrically insulating oil, and the other objective electroviscous fluid-applied device provided with this porous form.

公开(公告)号：JPH0633973A

公开(公告)日：1994-02-08

申请号：JP18666392

申请日：1992-07-14

Applicant: BRIDGESTONE CORP

Inventor： ENDO SHIGEKI ,  ISHINO YUICHI ,  SAITO TASUKU ,  OKAFUJI YUKITAKA

IPC: B23Q11/00 ,  B65G47/88 ,  B66C15/00 ,  F16F9/53

Abstract: PURPOSE:To provide a shock absorber which uses the pressure of an electroviscous fluid to return a piston which has absorbed impact and moved. CONSTITUTION:A piston 16, which has absorbed impact and moved, is required to be returned to its initial position. So compressed air is supplied by a compressor 38 into a fluid reservoir 14 and the air pressure forces an electroviscous fluid 14 to flow inversely into a cylinder 12 through either a main pipe 26 connected to both the cylinder 12 and the fluid reservoir 24 or a bypass pipe 42. Since the piston 16 is returned to its initial position by the pressure of the electroviscous fluid 14, the need for providing a separate spring, etc., for returning the piston is eliminated. Also, the possibility of the piston 16 being returned more than needed by the elastic force of a spring is eliminated.

公开(公告)号：JPH05287291A

公开(公告)日：1993-11-02

申请号：JP14648991

申请日：1991-05-23

Applicant: BRIDGESTONE CORP

Inventor： FUKUYAMA YOSHIKI ,  ISHINO YUICHI ,  SAITO TASUKU ,  KASHIMA YOSHIYASU

IPC: C10M169/04 ,  C10N10/06 ,  C10N10/08 ,  C10N20/02 ,  C10N20/06 ,  C10N40/14

Abstract: PURPOSE:To provide an electroviscous fluid which exhibits marked electroviscous effect, less power consumption, less precipitation of a dispersed phase, and excellent stability. CONSTITUTION:This fluid comprises 1-60 pts.wt., per 100 pts.wt. fluid, a dispersed phase composed of particles having an average particle size of 0.01-100mum which are composed of dry powder of flat large particulate silica sol comprised of combined colloidal silica particles having an average particle diameter of 4-50nm and containing a compound selected from the group consisting of an aluminum compound and a zirconium compound and water in respective amounts of 0.1-5wt.%, in terms of oxide, and 1-10wt.%, and 40-99 pts.wt., per 100 pts.wt. fluid, liquid phase composed of an insulating oil having a viscosity at room temperature of 0.65-1000cSt.

公开(公告)号：JPH0512922B2

公开(公告)日：1993-02-19

申请号：JP7177685

申请日：1985-04-04

Applicant: BRIDGESTONE CORP

Inventor： YAMADA TADATOSHI ,  SAITO TASUKU ,  OONO KYOSHI

IPC: A43B13/14

公开(公告)号：JPH04348192A

公开(公告)日：1992-12-03

申请号：JP15113691

申请日：1991-05-27

Applicant: BRIDGESTONE CORP

Inventor： KURACHI IKUO ,  SAITO TASUKU ,  TAKAGI MITSUHARU ,  KIJIMA SHIGERU

IPC: C01B31/02 ,  C10M125/02 ,  C10M171/00 ,  C10N20/06 ,  C10N40/14 ,  C10N70/00

Abstract: PURPOSE:To provide a decidedly new non-aqueous electro-viscous fluid exhibiting excellent electro-viscous effect. CONSTITUTION:The objective electro-viscous fluid is produced by dispersing carbonaceous powder obtained by the heat-treatment of polyaniline powder in an oily medium having electrical insulation.

公开(公告)号：JPH04198189A

公开(公告)日：1992-07-17

申请号：JP32531890

申请日：1990-11-29

Applicant: BRIDGESTONE CORP

Inventor： KURACHI IKUO ,  KAJIWARA NARUYUKI ,  SAITO TASUKU

IPC: C09K5/00 ,  C07F9/6581 ,  C09K21/12 ,  C10M105/74 ,  C10N30/00 ,  C10N30/08 ,  C10N40/06 ,  C10N40/08 ,  C10N40/16 ,  C10N40/36 ,  H01B3/20

Abstract: PURPOSE:To obtain a phosphazene oil, composed of a mixture of specific phosphonitrile ring compounds, having a low vapor pressure, a high dielectric constant and chemically stabilized characteristics, excellent in flame retardancy and useful as electrical insulating oils, power transmission oils, vacuum, oils, mold release agents, etc. CONSTITUTION:A flame retardant oil which is a mixture of phosphonitrile ring compounds having a molecular structure expressed by the formula (n is 3-15; R1 and R2 are aromatic compound derivative). The content of the compounds in which the number (n) of P=N bond units in the aforementioned compounds is 1-90% mol fraction based on the above-mentioned mixture and the content of the compounds in which (n) is 7 is >=1% expressed in terms of mol fraction in the mixture.