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Method for preparing carbonyl iron/ PMMA composite magnetic particle basic excitation rheological fluid

A technology of composite magnetic particles and magnetorheological fluid, applied in the direction of lubricating compositions, etc., can solve the problems of poor settlement stability, compaction, easy oxidation and deterioration, etc., and achieve good anti-settling performance and shear stress effect

Inactive Publication Date: 2009-06-03
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to provide a simple and easy preparation method of carbonyl iron / PMMA composite magnetic particle-based magnetorheological fluid with large-scale production prospects, which fundamentally overcomes the sedimentation of magnetic particles in the magnetorheological fluid carrier liquid Poor stability, easy to oxidize, deteriorate and harden, the magnetorheological fluid provided by this method has good anti-sedimentation stability and magnetorheological properties

Method used

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  • Method for preparing carbonyl iron/ PMMA composite magnetic particle basic excitation rheological fluid
  • Method for preparing carbonyl iron/ PMMA composite magnetic particle basic excitation rheological fluid
  • Method for preparing carbonyl iron/ PMMA composite magnetic particle basic excitation rheological fluid

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Embodiment Construction

[0035] The experimental apparatus diagram of the present invention is as shown in Figure 1.

[0036] The medicines involved in the preparation method of the present invention include: methyl methacrylate (MethylMethacrylate, MMA, chemically pure), sodium hydroxide (analytical pure), ammonium persulfate (analytical pure), glacial acetic acid (analytical pure), dodecyl Sodium alkyl sulfonate (chemically pure), methyl silicone oil (H201-500), and reagents were purchased from Sinopharm Chemical Reagent Co., Ltd., and were not further processed unless otherwise specified. Carbonyl iron powder (BASF, model: CN).

[0037] The specific preparation method is as follows:

[0038] 1. Nitrogen gas is passed through distilled water for a certain period of time to remove dissolved oxygen;

[0039] 2. Activate a certain amount of carbonyl iron powder with an appropriate amount of glacial acetic acid for several minutes;

[0040] 3. Methyl methacrylate is refined with a certain mass fracti...

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Abstract

The invention discloses a method for preparing carbonyl iron / PMMA composite magnetic particle basic excitation rheological fluid. The method is characterized in that methyl methacrylate, carbonyl iron powder, distilled water and sodium dodecyl sulfonate are added to a reaction vessel by a certain proportion; the temperature of the reaction vessel is kept in a certain range; under the atmosphere of insert protection, initiator ammonium persulfate is slowly added to the reaction system drop by drop while stirring, and evaporated methyl methacrylate is in condensate return flow to the reaction system; the reaction lasts for a plurality of hours; and the reaction products are washed for a plurality of times by distilled water and ethanol and received magnetic separation and vacuum drying to get carbonyl iron / polymethyl methacrylate composite magnetic particles. The density of carbonyl iron / PMMA (polymethyl methacrylate) composite magnetic particles of the invention is smaller than that of pure carbonyl iron powder, and excitation rheological fluid based on the composite particle can perform excellent anti-settlement and shear force even though no additive is added.

Description

technical field [0001] The invention belongs to the technical field of composite materials and intelligent materials, and in particular relates to a method for preparing suspended particles for improving the sedimentation stability of magnetorheological fluids, that is, carbonyl iron / PMMA (polymethyl methacrylate) composite magnetic particles. Background technique [0002] Magnetorheological fluid was first discovered by Rabinow in the 1940s. It is a suspension system composed of magnetic particles dispersed in mineral oil or other carrier fluids. This system can undergo a reversible change from Newtonian fluid to a solid-like state rapidly, and Accompanied by changes in other physicochemical properties, manifested as controllable rheological properties. Based on the controllable electromechanical coupling performance of magnetorheological fluid, it can be applied to engineering devices to realize intelligent control of vibration. Practical devices such as magnetorheological...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M171/00
Inventor 龚兴龙江万权朱红
Owner UNIV OF SCI & TECH OF CHINA
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