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A viscoelastic material with significantly variable damping controlled by a magnetic field

A viscoelasticity and damping technology, applied in the field of viscoelastic materials, can solve the problems of system parameter change, amplification, and damping characteristic dependence of vibration reduction system, and achieve the effect of enhancing stability and good temperature stability.

Active Publication Date: 2018-04-20
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aging of the structure, load and damping material itself during the service of the vibration damping system will lead to changes in system parameters, which requires the damping material to be adaptable in order to obtain a good vibration and noise reduction effect
At the same time, the damping characteristics of the vibration damping system strongly depend on the frequency of vibration and noise, while ordinary vibration damping systems are passive vibration dampers and cannot adapt to changes in vibration and noise frequencies. Effective isolation and control of frequency interference, while interference below or close to its frequency will even have an amplified effect, especially in the resonance area of ​​the vibration isolation system

Method used

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  • A viscoelastic material with significantly variable damping controlled by a magnetic field
  • A viscoelastic material with significantly variable damping controlled by a magnetic field
  • A viscoelastic material with significantly variable damping controlled by a magnetic field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 Preparation of viscoelastic material

[0036] The viscoelastic material whose damping is significantly changed under the control of the magnetic field of this embodiment is prepared. The raw materials include the following components by weight percentage: polyol (castor oil) 22.4%, carbonyl iron powder (spherical and dendritic mixed in 2:1) 60% , Diisocyanate (diphenylmethane diisocyanate) 2%, reinforcing agent (mica) 15%, organic metal catalyst (stannous octoate) 0.2%, accelerator (octadecyl alcohol) 0.3%, stabilizer (zinc oxide) 0.1%; carbonyl iron powder (see Image 6 ) Includes spherical and dendritic forms. The spherical carbonyl iron powder has a particle size of 0.5-27 μm, and the dendritic iron powder has an aspect ratio of 20-60.

[0037] The specific operations are as follows:

[0038] a. Dry the polyol to remove the water: weigh the corresponding weight of the polyol according to the set weight percentage and put it into a wide-mouth beaker, then place th...

Embodiment 2

[0049] Example 2 Preparation of viscoelastic material

[0050] The viscoelastic material whose damping is significantly changed under the control of the magnetic field of this embodiment, the raw materials for preparation include the following components by weight percentage: polyol (polyethylene glycol) 75%, carbonyl iron powder (spherical and dendritic mixed in 2:1) 10%, diisocyanate (toluene diisocyanate) 6.5%, reinforcing agent (barium sulfate) 8%, organic metal catalyst (dibutyl tin dilaurate) 0.1%, accelerator (liquid paraffin) 0.1%, stabilizer (trioxide) Diiron) 0.3%; Carbonyl iron powder includes spherical and dendritic forms, wherein the particle size of spherical carbonyl iron powder is 0.5-27 μm, and the aspect ratio of dendritic iron powder is 20-60.

[0051] The specific operations are as follows:

[0052] a. Dry the polyol to remove the moisture: weigh the corresponding weight of the polyol according to the set weight percentage and put it into a wide-mouth beaker, the...

Embodiment 3

[0062] Example 3 Preparation of viscoelastic material

[0063] The viscoelastic material whose damping is significantly changed under the control of the magnetic field of this embodiment is prepared. The raw materials include the following components by weight percentage: polyol (1,2-propanediol) 11%, carbonyl iron powder (spherical and dendritic according to mass ratio 2: 1 Mix) 80%, diisocyanate (isophorone diisocyanate) 1%, reinforcing agent (calcium silicate) 7%, organometallic catalyst (dioctyltin dilaurate) 0.35%, accelerator (stearyl alcohol) 0.4%, stabilizer (ferroferric oxide) 0.25%; carbonyl iron powder includes spherical and dendritic forms. The particle size of spherical carbonyl iron powder is 0.5-27μm, and the aspect ratio of dendritic iron powder is 20- 60.

[0064] The specific operations are as follows:

[0065] a. Dry the polyol to remove the water: weigh the corresponding weight of the polyol according to the set weight percentage and put it into a wide-mouth bea...

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Abstract

The invention belongs to the technical field of viscous-elastic materials, and particularly relates to a viscous-elastic material with significant changes in damping controlled by a magnetic field. The invention further provides a preparation method of the viscous-elastic material. The viscous-elastic material is characterized in that the viscous-elastic material is prepared from polyhydric alcohol, magnetic particles, diisocyanate, a reinforcing agent, an organo-metallic catalyst, an accelerant and a stabilizing agent. The viscous-elastic material is good in adjustability, can work in a vibration reduction mode requiring high loss capability and a large loss factor and also work in a vibration isolation mode requiring a small loss factor according to the requirements of a vibration reduction and isolation device, and can be applied to vibration, impact and noise control isolation devices in the field of vehicles, machines, aviation, aerospace, shipping and coasts, construction, etc.

Description

Technical field [0001] The invention belongs to the technical field of viscoelastic materials, and specifically relates to a viscoelastic material whose damping changes significantly under the control of a magnetic field. Background technique [0002] Nowadays, in the large structures as large as airplanes and the tiny structures as small as electronic products, vibration is given high attention. Because vibration is everywhere and will bring a series of problems. Vibration in the structure can cause deterioration of stability, failure of position control, reduced durability (especially fatigue durability), structural failure, and reduced reliability and performance. In addition, vibration and noise are often connected together. Vibration can cause noise (an irregular and uncoordinated vibration), and noise can be transformed into vibration. Therefore, the hazards of vibration and noise are closely related to governance. [0003] Viscoelastic damping materials are often used in e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/14C08G18/76C08G18/67C08K13/06C08K7/18C08K3/38C08K3/22C08K3/34C08K3/30C08K5/053
Inventor 余淼杨平安浮洁刘术志
Owner CHONGQING UNIV