A magnetorheological elastomer capable of precisely controlling the axial distribution of magnetic particles and its preparation method

A magnetorheological elastomer and magnetic particle technology, which is applied in the direction of magnetic objects, magnetic liquids, and magnetic materials, can solve problems such as difficulties in preparation methods, achieve reasonable formula design, precise control of distribution and content, and improve magnetorheological properties. effect of effect

Active Publication Date: 2020-07-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Anisotropic magnetorheological elastomers are more suitable for engineering applications than isotropic magnetorheological elastomers because their mechanical properties can be controlled by the content and distribution of magnetic particles contained inside and the strength and direction of an applied magnetic field. Extensive, but also more difficult in the preparation method

Method used

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  • A magnetorheological elastomer capable of precisely controlling the axial distribution of magnetic particles and its preparation method
  • A magnetorheological elastomer capable of precisely controlling the axial distribution of magnetic particles and its preparation method
  • A magnetorheological elastomer capable of precisely controlling the axial distribution of magnetic particles and its preparation method

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Effect test

Embodiment 1

[0020] Prepared by the method of the present invention such as figure 1 The frusto-conical magnetorheological elastomer shown. According to the three-dimensional shape of the circular frustum to be formed, the magnetorheological elastomer to be prepared is divided into 8 equal parts along the axial direction of the vertical bottom surface of the circular frustum (i.e. ①~⑧ in the figure), and the content of magnetic particles added to each part is respectively 10%, 20%, 30%, 40%, 50%, 60%, 70% and 80%, the corresponding rubber matrix content is 80%, 70%, 60%, 50%, 40%, 30%, 20% and 10%, the additive content is 10%; according to the above ratio, the raw materials are weighed, the weighed natural rubber latex solution and the additive are mixed evenly and the obtained mixture is preheated in an oven for 3 to 5 minutes; Add the weighed carbonyl iron powder into the mixture and stir and mix with a high-speed mixer for 10-15 minutes, so that the carbonyl iron powder is evenly distr...

Embodiment 2

[0022] Prepared by the inventive method such as figure 2 The cylindrical magnetorheological elastomer shown. According to the shape of the drum-shaped member to be formed, the magnetorheological elastomer to be prepared is divided into 7 equal parts in the axial direction (i.e. ①~⑦ in the figure), and the content of magnetic particles added to each part is 20%, 40%, 60%, 80%, 60%, 40% and 20%, the content of the corresponding rubber matrix is ​​70%, 50%, 30%, 10%, 30%, 50% and 70%, the additive content is 10%; weigh the raw materials according to the above ratio, mix the weighed natural rubber latex solution and additives evenly, and place the resulting mixture in an oven to preheat for 3 to 5 minutes; add the weighed carbonyl iron powder into the mixture and use Stir and mix with a high-speed mixer for 10 to 15 minutes, so that the carbonyl iron powder is evenly distributed in the natural rubber latex solution; use a vacuum pump to vacuumize the mixture of natural rubber la...

Embodiment 3

[0024] Prepared by the inventive method such as image 3 The cylindrical magnetorheological elastomer shown. According to the shape of the cylindrical member to be formed, the magnetorheological elastomer to be prepared is divided into 7 equal parts in the length direction (i.e. ①~⑦ in the figure), and the content of magnetic particles added to each part is 80%, 60% %, 40%, 20%, 40%, 60% and 80%, the content of the corresponding rubber matrix is ​​10%, 30%, 50%, 70%, 50%, 30% and 10%, and the additive content is 10% %; weigh the raw materials according to the above ratio, mix the weighed natural rubber latex solution and additives evenly and place the resulting mixture in an oven to preheat for 3 to 5 minutes; add the weighed carbonyl iron powder into the mixture and use a high-speed Stir and mix with the mixer for 10-15 minutes, so that the carbonyl iron powder is evenly distributed in the natural rubber latex solution; use a vacuum pump to vacuumize the mixture of the natur...

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Abstract

The invention discloses a magneto-rheological elastomer capable of accurately controlling axial distribution of magnetic particles and a preparation method thereof. The method comprises the steps that: firstly, according to the magneto-rheological effect change requirement of a target magneto-rheological elastomer in a certain axial direction, the target magneto-rheological elastomer is divided into a plurality of sections of magneto-rheological effect monomers according to a certain division sequence, the magneto-rheological effect monomers are prefabricated, and each section of the magneto-rheological effect monomers has the mass fraction occupied by a specific magnetic particle; and stacking the prefabricated magneto-rheological effect monomers in a final shaping mold consistent with the three-dimensional model in shape in sequence, and heating, pressurizing and forming the combined body to obtain the target magneto-rheological elastomer. According to the magneto-rheological elastomer prepared by the invention, the content of the magnetic particles in each magneto-rheological effect monomer is accurately controlled, so that the magneto-rheological effect generated by the magneto-rheological effect monomer generates gradient distribution in the axial direction, and the requirement of serving as a medium for forming a complex curved surface metal component by pressure is met.

Description

technical field [0001] The invention belongs to the technical field of intelligent materials, and in particular relates to a magnetorheological elastomer which precisely controls the axial distribution of magnetic particles and a preparation method thereof. Background technique [0002] Magnetorheological elastomer is a new type of magnetorheological smart material, which is solidified by natural rubber or artificial rubber, micron-sized ferromagnetic particles and additives under the action of a magnetic field. Compared with magnetorheological fluid, it has stable magnetic particles, It has the advantages of not easy to settle, fast response and low preparation cost. According to whether the performance of magnetorheological elastomers in different directions is the same, it can be divided into isotropic magnetorheological elastomers and anisotropic magnetorheological elastomers. Anisotropic magnetorheological elastomers are more suitable for engineering applications than ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/44C08L7/02C08K3/22
CPCC08K3/22C08K2003/2265C08K2201/01H01F1/447C08L7/02
Inventor 郭训忠王辉陶杰胡胜寒
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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