Viscous-elastic material with significant changes in damping controlled by magnetic field

A viscoelastic and damping technology, applied in the field of viscoelastic materials, can solve problems such as system parameter changes, amplification, and inability to adapt to changes in vibration and noise frequencies, and achieve good temperature stability and enhanced stability.

Active Publication Date: 2015-06-24
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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  • Viscous-elastic material with significant changes in damping controlled by magnetic field
  • Viscous-elastic material with significant changes in damping controlled by magnetic field
  • Viscous-elastic material with significant changes in damping controlled by magnetic field

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1 prepares viscoelastic material

[0036] The viscoelastic material whose damping is significantly changed by the control of the magnetic field in this embodiment, the preparation raw materials include the following components by weight percentage: polyol (castor oil) 22.4%, carbonyl iron powder (spherical and dendritic mixed at 2:1) 60% , diisocyanate (diphenylmethane diisocyanate) 2%, reinforcing agent (mica) 15%, organometallic catalyst (stannous octoate) 0.2%, accelerator (stearyl alcohol) 0.3%, stabilizer (zinc oxide) 0.1%; carbonyl iron powder (see Image 6 ) includes spherical and dendritic forms, wherein 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 operation is as follows:

[0038] 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, then ...

Embodiment 2

[0049] Embodiment 2 prepares viscoelastic material

[0050] The viscoelastic material whose damping is significantly changed by the control of the magnetic field in this embodiment, the preparation raw materials include the following components by weight percentage: polyol (polyethylene glycol) 75%, carbonyl iron powder (spherical and dendritic are mixed in 2:1) 10%, diisocyanate (toluene diisocyanate) 6.5%, reinforcing agent (barium sulfate) 8%, organometallic catalyst (dibutyltin dilaurate) 0.1%, accelerator (liquid paraffin) 0.1%, stabilizer (trioxide DiFe) 0.3%; the carbonyl iron powder includes spherical and dendritic forms, wherein 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.

[0051] The specific operation is 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 beak...

Embodiment 3

[0062] Embodiment 3 prepares viscoelastic material

[0063] The viscoelastic material of the present embodiment controlled by the magnetic field to significantly change the damping, the preparation raw materials include the following components by weight percentage: polyol (1,2-propylene glycol) 11%, carbonyl iron powder (spherical and dendritic by 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 (ferric oxide) 0.25%; carbonyl iron powder includes two forms of spherical and dendritic, wherein 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 operation is as follows:

[0065] 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...

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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, in particular to a viscoelastic material whose damping changes significantly under the control of a magnetic field. Background technique [0002] Vibration is now of great concern in structures as large as airplanes, as in tiny structures as small as electronics. Because vibrations are everywhere and can cause a whole host of problems. Vibration in a structure can lead to poor stability, loss of position control, reduced durability (especially fatigue durability), structural failure, and reduced reliability and performance. In addition, vibration and noise are often linked together. Vibration can cause noise (a kind of irregular and uncoordinated vibration), and noise can be transformed into vibration. Therefore, the hazards and governance of vibration and noise are closely related. [0003] Viscoelastic damping materials are frequently used in engineering applications to reduce ...

Claims

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Application Information

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Patent Type & Authority Applications(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
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