Improved giant electrorheological fluid and manufacturing method thereof

一种电流变、绝缘液的技术，应用在润滑组合物、添加剂、石油工业等方向，能够解决屈服应力降低等问题

Inactive Publication Date: 2015-07-15
THE HONG KONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, showing a 10% reduction in the yield stress

Method used

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  • Improved giant electrorheological fluid and manufacturing method thereof
  • Improved giant electrorheological fluid and manufacturing method thereof
  • Improved giant electrorheological fluid and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: Preparation of metal salt nanocomposites

[0040] Dissolve 3.63g of rubidium chloride and 73.35g of barium chloride in 225ml of 50-70°C distilled water. At the same time, 94.56g of oxalic acid was dissolved in 750ml of a warm water bath at 65°C and ultrasonicated. Slowly add 330 g of titanium chloride aqueous solution (titanium chloride accounts for 10 wt% of the solution) into the above-mentioned warm water bath. The mixed solution of rubidium chloride and barium chloride was mixed with the warm water bath added with titanium chloride, and 45 g of urea was added simultaneously to form a white colloid, which was then cooled to room temperature. After washing and filtering, the precipitate is dried. The precipitate is a metal salt nanocomposite coated with urea.

Embodiment 2

[0041] Embodiment 2: adding polar molecular additives to prepare GER liquid

[0042] The metal salt nanocomposite prepared by 30g embodiment 1 was combined with 0.2g SDBS and 70g silicone oil, and the mixture was ground for 30 minutes in a ball mill, and then under 20-40°C, ultrasonic treatment was carried out with maximum power (ultrasonic instrument: LUKADENT company , 28H Ultrasonik,, C") for 1 hour. The mixture was conditioned in a vacuum freeze dryer for 12 hours to remove any excess water. Various properties of the surfactant-added GER fluid were then tested.

Embodiment 3

[0043] Embodiment 3: adding polar molecular additives to prepare GER liquid

[0044] The metal salt nanocomposite prepared by 30g embodiment 1 was combined with 1.0g SDBS and 70g silicone oil, and the mixture was ground for 30 minutes in a ball mill, and then under 20-40°C, ultrasonic treatment was carried out with maximum power (ultrasonic instrument: LUKADENT company , 28H Ultrasonik,, C") for 1 hour. The mixture was conditioned in a vacuum freeze dryer for 12 hours to remove any excess water. Various properties of the surfactant-added GER fluid were then tested.

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Abstract

The invention relates to an improved giant electrorheological (GER) fluid and a manufacturing method thereof. The GER fluid comprises metal salt nano composite coated by urea, polar molecule additive and high-wettability insulating liquid, wherein the metal salt nano composite suspends in the high-wettability insulating liquid. By adding the polar molecule additive, the yield stress of the GER fluid under the electric field is increased by more than 50%, but the current density is reduced to 1 / 4 of that of the original GER fluid. The reversible response time maintains the same, and the sedimentary stability is obviously improved. The zero field viscosity of the improved GER fluid maintains the same as that of the GER fluid without the additive. The electrical and mechanical properties of the improved GER fluid are improved, and the improved GER fluid can be applied to vehicle clutches, hydraulic brakes and vehicle dampers.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application No. 61 / 964,636, filed January 10, 2014. technical field [0003] This application relates to giant electrorheological fluids and the role of particle-fluid wetting surfactants in inducing electrorheological effects formed by particles in fluid suspension. This application is particularly concerned with the role of particle-fluid wetting surfactants in reducing sedimentation rates. Background technique [0004] Electrorheological (ER) fluid is a colloidal suspension containing micro- or nanoparticles dispersed in insulating oil. The rheological properties (apparent viscosity) of ER fluid can be adjusted continuously and reversibly from fluid to solid and then back again with electric field. Specifically, ER fluid exhibited solid-like properties, such as the ability to transmit shear stress, when an electric field of 1–5 kV / mm was applied. The transition t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10M125/18C10M177/00C10N40/16
CPCC10M171/001C10M2201/14C10M2203/1006C10M2207/289C10M2207/401C10M2209/104C10M2209/109C10M2215/04C10M2215/042C10M2215/102C10M2215/223C10M2219/042C10M2219/044C10M2229/025C10N2030/04C10N2030/02C10N2010/04C10N2030/60C10N2040/04C10N2040/25C10N2040/08C10M135/10C10M125/18C10M133/20C10M141/08
Inventor 沈平廖麦加温维佳方雅莹
Owner THE HONG KONG UNIV OF SCI & TECH
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