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Electrorheological compositions

A composition and electrorheological technology, applied in the direction of lubricating composition, petroleum industry, etc., can solve the problems of electrorheological effect, component durability effect, electrode corrosion, etc.

Inactive Publication Date: 2015-03-04
HITACHI AUTOMOTIVE SYST EURO GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, it has been found to be disadvantageous in practice that the use of salts as additives when using the ERF leads to undesired electrode corrosion, which adversely affects the electrorheological effect and the durability of the components

Method used

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  • Electrorheological compositions
  • Electrorheological compositions
  • Electrorheological compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0063] Chemicals for the synthesis were purchased from Momentive Performance Materials Inc., Kurt Obermeier GmbH & Co. KG, Sigma Aldrich, Alfa Aesar, Merck JV AG, VWR and Carl Roth and used directly or using Molsieb ( ) and ion exchanger (such as DOWEX * G-26 (H) or DOWEXTM MAC-3) pretreatment.

[0064] The glass and metal instruments used were dried at a temperature of 120° C. in a drying cabinet. To drain the water to the reaction configure a drying tube (desiccant: CaCl 2 ) or covered by argon or nitrogen as protective gas.

[0065] The ERFs prepared below were tested in a modified rotational viscometer and determined according to DIN 51480-1 as already described by W. M. Winslow in Appl. Phys. 20 (1949), pages 1137 to 1140.

[0066] The measurement geometry consists of the following: cylinder diameter (of the rotary cylinder) 16.66 mm, gap width between electrodes 0.7055 mm and length of the measurement gap 254.88 mm (according to ISO 3219 standard). In the process of ...

Embodiment 1

[0086] 1900 g of trifunctional polyethylene glycol was heated to 60° C., then 1.7 g of lithium acetate and 5.5 g of diazacyclo[2.2.2]octane were added and stirred for 2 hours. After cooling to RT, add 2300 grams of silicone oil (polymethylsiloxane: viscosity 5mm 2 / s, at a temperature of 25°C the density is 0.9 g / cm 3 ) and 43.5 g of emulsifier OF 7745 (Momentive Performance Materials Holding GmbH, Leverkusen) and homogenized using a jet dispersant (1 hour; 9 bar). 524 grams of toluene diisocyanate were then added to the formed emulsion. The dispersant hardens overnight at a temperature of 30 to 60°C.

Embodiment 2

[0088] Prepared as in Example 1, but adding 7.5 grams of lithium stearate to the polyethylene glycol. A pre-solution of 300 g polyethylene glycol was stirred overnight at 60 °C and then passed through an Ultra-Turrax at RT using TM (IKA-Werke GmbH, Staufen, Germany) for homogenization and delivery to the synthesis.

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Abstract

The present invention relates to an electrorheological composition with corrosion-inhibiting properties, methods for the production thereof and use thereof.

Description

technical field [0001] The present invention relates to an electrorheological composition with anti-corrosion properties, a process for its production and its use. Background technique [0002] Non-aqueous dispersions and emulsions are becoming more and more important. They are used in particular as electrorheological fluids or compositions, which are present in liquid, gel or paste form. An electrorheological fluid can be understood as a dispersion of finely divided particles in a hydrophobic and non-conductive oil. The apparent viscosity of the dispersion changes particularly rapidly under the action of an electrostatic or alternating electric field and reversibly converts from liquid to viscous or solid state, the current consumption of the ERF being as low as possible. [0003] The viscosity rise in the ERF in the presence of an applied electric field can be qualitatively explained as follows: colloidal chemically stable dispersed particles are polarized in the electri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M171/00
CPCC10M2209/1045C10N2230/12C10N2210/01C10M2229/02C10M2207/123C10N2250/02C10M2229/0465C10M2207/122C10M2207/124C10M2207/126C10M2229/051C10M2207/141C10N2230/60C10M2219/042C10M2209/1033C10M171/001C10M2229/0405C10M2215/14C10N2010/02C10N2030/12C10N2030/60C10N2050/01
Inventor D·基泽D·亚当斯H·U·亨斯根
Owner HITACHI AUTOMOTIVE SYST EURO GMBH
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