Phase-change suspension fluid composition including polyethylene oxide particles and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-9914105-B2
Application number	US-201514717711-A
Country	US
Kind code	B2
Filing date	May 20, 2015
Priority date	Nov 7, 2014
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

A suspension fluid prepared by dispersing polyethylene oxide particles into a solvent including water and one or more types of compounds selected from the group consisting of ethylene glycol and propylene glycol, and a method for manufacturing the same. The phase-change suspension fluid can be a shear-thinning fluid showing a constant newtonian behavior in a low shear rate or low frequency region, but showing a non-newtonian behavior appearing as liquid-like suspension in a high shear rate or high frequency region due to viscosity decrease, and is capable of reversible phase changes by the vibration of a vehicle, and therefore, may provide effects of having advantages of a hydraulic bush in a low frequency region and also having advantages of a solid bush in a high frequency region.

First claim

What is claimed is:

1. An automotive hydraulic bush having phase-change suspension fluid composition comprising:
polyethylene oxide particles; and
a solvent including water, ethylene glycol and propylene glycol,
wherein the polyethylene oxide particles have a weight average molecular weight (Mw) of 100,000 to 900,000,
the polyethylene oxide particles are included in 5 to 30% by weight with respect to the total weight of the phase-change suspension fluid composition.

2. The automotive hydraulic bush of claim 1 , wherein the phase-change suspension fluid having first and second phases which reversibly change during operation of the automotive hydraulic bush having vibration.

3. A method for manufacturing an automotive hydraulic bush having a phase-change suspension fluid, the method comprising:
(i) preparing a suspension fluid by mixing and dispersing polyethylene oxide particles into a solvent including water, ethylene glycol and propylene glycol;
(ii) ultrasonicating the suspension fluid; and
(iii) removing air by placing the ultrasonicated suspension fluid in a vacuum chamber,
wherein the polyethylene oxide particles have a weight average molecular weight (Mw) of 100,000 to 900,000, and
the polyethylene oxide particles are included in 5 to 30% by weight with respect to the total weight of the phase-change suspension fluid composition.

4. The method of claim 3 , wherein the ultrasonification of the operation (ii) is carried out for 9 to 12 hours.

5. The method of claim 3 , wherein the air removal of the operation (iii) was carried out for 9 to 12 hours.

6. The method of claim 3 , wherein phase of the phase-change suspension fluid having first and second phases which reversibly change during operation of the automotive hydraulic bush having vibration.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Park Jong Min
• Seo Jae Sik
• Yang Kyung Mo
• Chang Dae Sung
• Choi Hyung Jin

Classifications

• C08J3/05 Primary

  from solid polymers · CPC title

• F16F9/49

  Stops limiting fluid passage, e.g. hydraulic stops {or elastomeric elements inside the cylinder which contribute to changes in fluid damping (fluid-actuated displacement devices with means for accelerating or decelerating the stroke F15B15/22)} · CPC title

• F16F13/14

  Units of the bushing type {, i.e. loaded predominantly radially (bushes F16F1/38; mounting brackets therefor F16F1/3849)} · CPC title

• B01J13/0082

  containing an organic phase · CPC title

• B01J13/0021 Primary

  containing a solid organic phase · CPC title