CS271294B1 - Magnetic liquid and method of its production - Google Patents
Magnetic liquid and method of its production Download PDFInfo
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- CS271294B1 CS271294B1 CS888717A CS871788A CS271294B1 CS 271294 B1 CS271294 B1 CS 271294B1 CS 888717 A CS888717 A CS 888717A CS 871788 A CS871788 A CS 871788A CS 271294 B1 CS271294 B1 CS 271294B1
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- 239000007788 liquid Substances 0.000 title claims description 19
- 230000005291 magnetic effect Effects 0.000 title claims description 14
- 238000004519 manufacturing process Methods 0.000 title claims 2
- 238000000034 method Methods 0.000 title abstract description 7
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical compound O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 239000011553 magnetic fluid Substances 0.000 claims abstract description 9
- 229920002367 Polyisobutene Polymers 0.000 claims abstract description 8
- 239000002270 dispersing agent Substances 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 7
- 150000005690 diesters Chemical class 0.000 claims abstract description 7
- 239000003381 stabilizer Substances 0.000 claims abstract description 7
- 229960002317 succinimide Drugs 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 6
- 150000003839 salts Chemical class 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims abstract description 3
- 239000002244 precipitate Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000004711 α-olefin Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 5
- MIMDHDXOBDPUQW-UHFFFAOYSA-N dioctyl decanedioate Chemical compound CCCCCCCCOC(=O)CCCCCCCCC(=O)OCCCCCCCC MIMDHDXOBDPUQW-UHFFFAOYSA-N 0.000 claims description 4
- AFFLGGQVNFXPEV-UHFFFAOYSA-N n-decene Natural products CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 claims description 4
- 150000007524 organic acids Chemical class 0.000 claims description 4
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- 239000000539 dimer Substances 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 235000005985 organic acids Nutrition 0.000 claims description 3
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 3
- 239000012279 sodium borohydride Substances 0.000 claims description 3
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 2
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 2
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 2
- OYHQOLUKZRVURQ-HZJYTTRNSA-N Linoleic acid Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(O)=O OYHQOLUKZRVURQ-HZJYTTRNSA-N 0.000 claims description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000005642 Oleic acid Substances 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 239000000908 ammonium hydroxide Substances 0.000 claims description 2
- ZFMQKOWCDKKBIF-UHFFFAOYSA-N bis(3,5-difluorophenyl)phosphane Chemical compound FC1=CC(F)=CC(PC=2C=C(F)C=C(F)C=2)=C1 ZFMQKOWCDKKBIF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000010908 decantation Methods 0.000 claims description 2
- 238000004821 distillation Methods 0.000 claims description 2
- 239000012153 distilled water Substances 0.000 claims description 2
- 150000004665 fatty acids Chemical class 0.000 claims description 2
- 239000011790 ferrous sulphate Substances 0.000 claims description 2
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 2
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 2
- 235000020778 linoleic acid Nutrition 0.000 claims description 2
- OYHQOLUKZRVURQ-IXWMQOLASA-N linoleic acid Natural products CCCCC\C=C/C\C=C\CCCCCCCC(O)=O OYHQOLUKZRVURQ-IXWMQOLASA-N 0.000 claims description 2
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000013638 trimer Substances 0.000 claims description 2
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 claims 1
- 239000004215 Carbon black (E152) Substances 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 claims 1
- 229930195733 hydrocarbon Natural products 0.000 claims 1
- 239000001384 succinic acid Substances 0.000 claims 1
- 239000000243 solution Substances 0.000 abstract description 7
- 239000012530 fluid Substances 0.000 abstract description 3
- 150000007529 inorganic bases Chemical class 0.000 abstract description 2
- 150000007530 organic bases Chemical class 0.000 abstract description 2
- 206010053567 Coagulopathies Diseases 0.000 abstract 2
- 230000035602 clotting Effects 0.000 abstract 2
- 230000004907 flux Effects 0.000 abstract 2
- 208000005156 Dehydration Diseases 0.000 abstract 1
- 125000001931 aliphatic group Chemical group 0.000 abstract 1
- 239000012267 brine Substances 0.000 abstract 1
- 150000002739 metals Chemical class 0.000 abstract 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 abstract 1
- 229920000642 polymer Polymers 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 1
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical class OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- -1 carbohydrate fatty acid Chemical class 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910021518 metal oxyhydroxide Inorganic materials 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical class OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Soft Magnetic Materials (AREA)
- Lubricants (AREA)
Abstract
Description
Vynález ea týká magnetické) kvapaliny na báze feromagnetického kovu, stabilizátore, dispergátora а кvapalného nosiča eo spósobom je) přípravy· Magnetická kvapalina Je stála koloidná suspenzia častíc feromagnetických kovov vo vhodnom kvapalnom nosiči· □edna z prvých magnetických kvapalín bola na báze vody, v ktorej bol dispergovaný čerstvo připravený magnetit/Elmore W. C·: Phys· Rev. vol· 34, str. 308 (1938)/· Jednou z požiadaviek na kvalitná magnetická kvapalinu je aj velkost častíc feromagnetického kovu· Koloidná velkost častíc sa donedávna zabezpečovala mletím feromagnetických rád v gul. mlynoch /8 Khalafalla Z. S.: Chem. Těch., vol. 5 str. 540 - 546 (1975), US 3 215 572/. Mletie bolo energeticky náročné a trvalo cca 1 000 hodin.The present invention relates to a magnetic fluid based on a ferromagnetic metal, a stabilizer, a dispersant and a liquid carrier in a method of preparation. Magnetic Liquid Is a stable colloidal suspension of ferromagnetic metal particles in a suitable liquid carrier. freshly prepared magnetite was dispersed / Elmore W. C. Phys. vol. 34, p. 308 (1938) / · One of the requirements for a high-quality magnetic liquid is the particle size of the ferromagnetic metal. Until recently, the colloidal particle size was ensured by milling the ferromagnetic orders in a sphere. mlynoch / 8 Khalafalla Z. S .: Chem. Tech., Vol. 5 p. 540-546 (1975), US 3,215,572]. The grinding was energy intensive and took about 1,000 hours.
V sáčasnosti sá známe viaceré sposoby přípravy častíc vhodných pre výrobu /syntézu/ magnetické] kvapaliny - od termálneho rozkladu solí feromagnetických kovov organických kyslín (OP 11 412/61, 22 230/61, 22 394/68) cez redukciu oxyhydroxidov feromagnetických kovov vo vhodnom roztoku (GB 1 192 167/ US 3 598 968, 3 681 018) a odpařovánie častíc feromagnetických kovov v inertných plynoch (JP 27 718/72) až po technologicky poměrně jednoduchá redukciu solí /JP 20 520/63, 20 116/68, US 3 206 338, 3 663 318, CS 223 697/.At present, several methods of preparing particles suitable for producing / synthesizing / magnetic] liquids are known - from thermal decomposition of ferromagnetic metal salts of organic acids (OP 11 412/61, 22 230/61, 22 394/68) to reduction of ferromagnetic metal oxyhydroxides in a suitable solution (GB 1 192 167 / US 3 598 968, 3 681 018) and evaporation of ferromagnetic metal particles in inert gases (JP 27 718/72) to technologically relatively simple salt reduction / JP 20 520/63, 20 116/68, US 3,206,338, 3,663,318, CS 223,697].
Uvedené sposoby přípravy však nie sá vhodné pre magnetické kvapaliny, ktoré obsahu já ako kvapalný nosič diestery dvojsýtnych organických kyselin alebo polyméry alkénov.However, the above processes are not suitable for magnetic liquids which contain diesters of dibasic organic acids or alkene polymers as the liquid carrier.
Nedostatky uvádzaných kvapalín odstraňuje magnetická kvapalina na báze feromagnetického kovu, stabilizátore, dispergátora a kvapalného nosiča podía vynálezu.The drawbacks of said fluids are overcome by a magnetic fluid based on a ferromagnetic metal, a stabilizer, a dispersant and a liquid carrier according to the invention.
Podstata vynálezu spočívá v tom, že 0,1 až 20 dielov hmot, feromagnetického kovu sa stabilizuje 0,1 až 20 dielmi hmot, mastnou kyselinou o počte 10 až 20 uhlíkov v nebaže i /stabilizátor/ přidá sa 0,1 až 20 dielov hmot, polyizobutylénsukcínimidu s obsahom 0,01 ež 10 % hmot, /dispergátor/ a zvyšok do 100 dielov hmot, diester organické) dvojsýtnej kyseliny alebo polymér alfa-olefínov ako sá dialkyladipáty, sebakáty, kde alkyl obsahuje 6 až 20 atómov uhlíka a organická dvojsýtna kyselina 6 až 20 atómov uhlíka v retazci alebo v molekule alebo mono až pentaméry olefínov s počtom uhlíka 8 až 60 v polymérnom retazci.The essence of the invention is that from 0.1 to 20 parts by weight of the ferromagnetic metal is stabilized by 0.1 to 20 parts by weight, of a 10 to 20 carbohydrate fatty acid (stabilizer) from 0.1 to 20 parts by weight. polyisobutylenesuccinimide containing from 0.01 to 10% by weight, (dispersant) and the remainder up to 100 parts by weight, diester of an organic) dibasic acid or a polymer of alpha-olefins such as dialkyl adipates, sebacates wherein the alkyl contains 6 to 20 carbon atoms and the organic dibasic acid 6 to 20 carbon atoms in the chain or molecule or mono to pentamers of olefins having a carbon number of 8 to 60 in the polymer chain.
Takými nosičmi sá napr. dioktyladipát hustoty 926 kg/m , viskozity 12,84 mPa.s pri 20 °C, teplota vzplanutia 198 °C, číslo kyslosti 0,08 mg KOH/g, dioktylsebakát hustoty 915 kg/m3, čísla kyslosti 0,13 mg KOH/g, teplota vz^íanutia 230 °C, diméry až pentaméry decénu alebo okténu s destilačným rozmedzím 256 až 404 °C a kinemat. viskozitami: ditnér 1,47, trimér 2,69, tetramér 6,49, pentamér 10,97 <nm2/s a teplotami tuhnutia -54 °C·Such carriers are e.g. dioctyl adipate density 926 kg / m, viscosity 12.84 mPa.s at 20 ° C, flash point 198 ° C, acid number 0.08 mg KOH / g, dioctyl sebacate density 915 kg / m 3 , acid number 0.13 mg KOH / g, a flash point of 230 ° C, dimers to pentamers of decene or octene with a distillation range of 256 to 404 ° C and kinematics. viscosities: diary 1.47, trimer 2.69, tetramer 6.49, pentamer 10.97 <nm 2 /, and freezing temperatures -54 ° C ·
Uvedená magnetická kvapalinu je možné připravit spósobom podlá vynálezu, ktorého podstata spočívá v tom, že roztok solí feromagnetického kovu, ochladený na teplotu 0 až 15 °C sa v priebehu max# 15 sekánd zráža na rovnaká teplotu ochladenou organickou alebo anorganickou zásadou či redukujácim plynom. Vzniknutá zrazenina sa po premytí magneticky dekantuje a odstředí. К vlhkej zrazenine sa přidá 0,1 až 20 dielov hmot, mastnéj kyseliny a počtom 10 až 20 atómov uhlíka, zmes sa zahřeje na 90 až 110 °C a pri tejto teplote sa za miešania a odstranovania vody udržuje 4 až ю minút - do vzniku pasty. К vzniknuté) paste sa přidá 0,1 až 20 dielov hmot, pólyizobutylénsukcínimidu s obaahom 0,1 až 10 % hmot, dusíka a diesterový nebo alfa oleflnový olej /kvapalný nosič/.The magnetic liquid may be prepared by the method of the invention, characterized in that a solution of ferromagnetic metal salts cooled to 0 to 15 ° C is precipitated to the same temperature with a cooled organic or inorganic base or reducing gas over a maximum of # 15 seconds. The resulting precipitate is magnetically decanted and centrifuged after washing. 0.1 to 20 parts by weight of fatty acid and 10 to 20 carbon atoms are added to the wet precipitate, the mixture is heated to 90 to 110 ° C and kept at this temperature with stirring and removal of water for 4 to 8 minutes until formation. paste. 0.1 to 20 parts by weight of polyisobutylene succinimide containing 0.1 to 10% by weight of nitrogen and diester or alpha olefin oil (liquid carrier) are added to the paste.
Magnetická kvapalina podía vynálezu obsahuje feromagnetické částice, ktoré majú znížená a menej róznorodá velkosb, čím sa dosahuje ich lepšia disperzibilita a stabilita. Zjednodušuje sa a] příprava magnetické] kvapaliny- jednoduchá zrážacia metoda s krátkým časom přípravy, s použitím technicky využitelných kvapalných nosičov a účinných zne3Í tenzidov.The magnetic fluid according to the invention comprises ferromagnetic particles having reduced and less heterogeneous sizes, thereby achieving better dispersibility and stability. It is simplified and the preparation of a magnetic liquid is a simple precipitation method with a short preparation time, using technically usable liquid carriers and effective surfactant contaminants.
Z uvedeného vyplývá aj znížená prácnost pri príprave.This also implies a reduced preparation effort.
Dieaterový resp. alfa-olefínový olej znižuje vyparivost magnetickej kvapaliny, kvoli čomu sa táto hodí pre vákuové a tesniace prvky. Použitý dispergátor zasa umožňuje připravit magneticko kvapalinu s vyšším obsahom feromagnetických častíc čím' sa rozšiřuje možnost jej uplatnenia v technickéj praxi.Dieaterový resp. Alpha-olefin oil reduces the evaporation of the magnetic liquid, making it suitable for vacuum and sealing elements. The dispersant used, in turn, makes it possible to prepare a magnetic liquid with a higher content of ferromagnetic particles, thereby extending the possibility of its application in technical practice.
Uvedené příklady ilustrujú, ale neobmedzujú predmet vynálezu.These examples illustrate but do not limit the scope of the invention.
Příklad 1 mol síranu železnatého (FeS04.7 H20) a 2 moly chloridu železitého (Fecl3. .бН^О) sa rozpustia v 1 000 ml destilovanej vody, roztok sa ochladí na 5 °C a za stálého miešania sa počas 15 sekúnd zráža 6 molmi hydroxidu amonného s teplotou 5 °C. Vzniknutá zrazenina sa magneticky dekantuje, odstředí a promyje horúcou vodou. К premytej zrazenine, obsahujúcej 3 moly magnetitu sa přidá 0,5 molu kyseliny olejovej. Zmes sa zahrieva na teplotu 105 °C a udržuje sa po dobu 4 minút. Vytlačená voda sa magnetickou dekantáciou oddělí a vznikne pasta.Example 1 moles of ferrous sulphate (FeSO 4 .7H 2 O) and 2 moles of ferric chloride (Fecl 3 · 7 × 2) are dissolved in 1000 ml of distilled water, the solution is cooled to 5 ° C and stirred with stirring for It precipitates for 15 seconds with 6 moles of ammonium hydroxide at 5 ° C. The resulting precipitate is magnetically decanted, centrifuged and washed with hot water. 0.5 mol of oleic acid was added to the washed precipitate containing 3 moles of magnetite. Heat the mixture to 105 ° C and hold for 4 minutes. The extruded water is separated by magnetic decantation and a paste is formed.
К 10 dielom hmot, pasty sa přidá 1 diel hmot, pólyizobutylénsukcínimidu s obsahom dusíka 1,47 % hmot, a nasledne do 100 dielov hmotnosti dioktylsebakát hustoty 915 kg/m3. Po dokonalou premiešaní sa zmes odstředí pri hodnotě prebaženia 7 000 g po dobu 1 hodiny.To 10 parts by weight of the paste, 1 part by weight of polyisobutylene succinimide having a nitrogen content of 1.47% by weight is added, followed by up to 100 parts by weight of the dioctyl sebacate of density 915 kg / m 3 . After thorough mixing, the mixture was centrifuged at a weight of 7000 g for 1 hour.
Získá sa 100 dielov hmot, magnetickej kvapaliny.100 parts by weight of a magnetic liquid are obtained.
Příklad 2Example 2
Roztok solí feromagnetických kovov připravený ako v příklade 1 sa ochladí na teplotu 15 °C a za intenzívneho miešania sa zráža počas 15 sekúnd 6 mólmi roztoku pozostávaJúceho z 1 dielu hmot, hydridu sodnoboritého (NaBH4) a 99 dielov hmot. 90 %-ného roztoku hydroxidu sodného, ochladeného na 5 °C. Zrazenina sa premyje horúcou dest. vodou, magneticky dekantuje a odstředí. Koloidná zmes sa zohreje na no °C, přidá sa к nej 1 mol kyseliny linolovej a za pomalého miešania a odstraňovania vody sa pri tejto teplote udržuje 6 minút. К 20 dielom hmot, pasty sa přidá 20 dielov hmot, pólyizobutylénsukcínimidu s obsahom 4,6 % hmot, dusíka a nasledne do 100 dielov hmot, alfa-olefínový olej tvořený tetramérom decénu. Zmes sa dokonale rozmieša a pri hodnotě přetaženia 7 000 g sa i hodinu odstředí. Získá sa 100 dielov hmot, magnetickej kvapaliny na báze alfa-olefínového oleja.The ferromagnetic metal salt solution prepared as in Example 1 is cooled to 15 ° C and precipitated for 15 seconds with 6 moles of a solution consisting of 1 part by weight, sodium borohydride (NaBH 4 ) and 99 parts by weight with vigorous stirring. 90% sodium hydroxide solution, cooled to 5 ° C. The precipitate was washed with hot dest. water, magnetically decant and centrifuge. The colloidal mixture is warmed to n ° C, 1 mol of linoleic acid is added thereto, and the mixture is kept at this temperature for 6 minutes with slow stirring and removal of water. To 20 parts by weight of the paste, 20 parts by weight of polyisobutylene succinimide containing 4.6% by weight of nitrogen are added, followed by 100 parts by weight of alpha-olefin oil formed by decene tetramer. The mixture was thoroughly mixed and centrifuged for an hour at an overload of 7000 g. 100 parts by weight of an alpha-olefin oil magnetic liquid are obtained.
Vynález Je možné použit v robotike při tesneniach prevodoviek a manipulátorov v robotike.The invention can be used in robotics to seal gears and manipulators in robotics.
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|---|---|---|---|
| CS888717A CS271294B1 (en) | 1988-12-23 | 1988-12-23 | Magnetic liquid and method of its production |
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| CS888717A CS271294B1 (en) | 1988-12-23 | 1988-12-23 | Magnetic liquid and method of its production |
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| CS871788A1 CS871788A1 (en) | 1990-01-12 |
| CS271294B1 true CS271294B1 (en) | 1990-09-12 |
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| CS888717A CS271294B1 (en) | 1988-12-23 | 1988-12-23 | Magnetic liquid and method of its production |
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