Damping-adjustable polyurethane material and its preparation method and application thereof

A technology of polyurethane materials and polyurethane prepolymers, applied in vibration suppression adjustment, non-rotational vibration suppression, etc., can solve the problems of high natural frequency of magnetorheological elastomers, high resonance frequency, poor high-frequency vibration damping effect, etc., to reduce vibration The effect of transmissibility and broad application prospects

Active Publication Date: 2014-02-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem of high natural frequency of magnetorheological elastomers in the prior art, which causes the resonance frequency to move to high frequency, and the high frequency vibration damping effect is poor, and to provide a polyurethane material with adjustable damping and its preparation method and application

Method used

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  • Damping-adjustable polyurethane material and its preparation method and application thereof
  • Damping-adjustable polyurethane material and its preparation method and application thereof

Examples

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preparation example Construction

[0023] A method for preparing a polyurethane material with adjustable damping, comprising the steps of:

[0024] (1) take polyurethane prepolymer, chain extender, magnetic particle and coupling agent by weight;

[0025] (2) Stir the polyurethane prepolymer, chain extender, magnetic particles and coupling agent evenly to obtain a premix;

[0026] (3) Pour the premixed material into a mold and mold it at 80-150° C. for 30 minutes to obtain a polyurethane material with adjustable damping.

[0027] The polyurethane material with adjustable damping prepared by the present invention can be applied to prepare shock absorbers, such as a shock absorber with controllable stiffness and damping disclosed in Chinese patent 200510038642.1.

Embodiment 1

[0030] combine figure 1 Illustrative Example 1

[0031] Preparation of polyurethane material with adjustable damping:

[0032] Weigh 100g of polyurethane prepolymer with an isocyanate index of 2%, 2g of chain extender 1,4-butanediol, 15g of carbonyl iron powder and 0.3g of Si69, mix them evenly, pour them into a mold, and press at 100°C for 30min , the polyurethane material with adjustable damping is obtained.

[0033] figure 1 It is the relationship curve of the ratio of vibration transmissibility to damping of the material as a function of operating frequency in the case of the polyurethane material in Example 1 of the present invention with or without a magnetic field. It can be seen from the figure that the damping of the polyurethane material of the present invention can change significantly with the external magnetic field, and under the influence of the magnetic field of 0-0.3T, its damping increases from 0.12 to 0.32, which increases nearly three times.

Embodiment 2

[0035] Preparation of polyurethane material with adjustable damping:

[0036] Weigh 100g of polyurethane prepolymer with an isocyanate index of 5.3%, 5g of chain extender 1,3-butanediol, 5g of 3,3′-dichloro-4,4′-diaminodiphenylmethane, 5g of nickel carbonyl and 0.1g of Si75, mixed evenly, poured into a mold, and molded at 100°C for 30 minutes to obtain a polyurethane material with adjustable damping.

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Abstract

The invention discloses a damping-adjustable polyurethane material and its preparation method and an application thereof and belongs to the technical field of high molecular materials. According to the invention, the technical problem that high inherent frequency of a magnetorheological elastomer in the prior art results in that resonance frequency moves to higher frequency and high-frequency damping effect is poor is solved. The damping-adjustable polyurethane material provided by the invention comprises: by weight, a polyurethane performed polymer with isocyanate index being 2-8%, 2-10 parts of a chain extender, 5-80 parts of magnetic particles and 0.1-2 parts of a coupling agent. Under the influence of a magnetic field of 0-0.3T, damping of the damping-adjustable polyurethane material is increased from 0.12 to 0.32. According to a vibration damper prepared by the use of the damping-adjustable polyurethane material, the high-frequency damping effect is guaranteed, and vibration transmissibility of a resonance region can be reduced effectively. The damping-adjustable polyurethane material has a wide application prospect in the fields of automobile engine vibration damping and the like which require wideband vibration damping.

Description

technical field [0001] The invention relates to a polyurethane material with adjustable damping and its preparation method and application, belonging to the technical field of polymer materials. Background technique [0002] Damping is an important indicator of vibration and noise reduction materials. For vibration-damping materials, it is related to the size of the vibration-damping efficiency. Generally speaking, when the damping increases, the vibration transmission rate of the material near the resonance frequency decreases, but in In the vibration reduction area far away from the resonance transmission frequency, the vibration transmission rate shows an increasing trend, that is to say, a good low-frequency vibration reduction effect will inevitably lead to a poor high-frequency vibration reduction effect, and vice versa. If the damping of the material can be intelligently adjusted according to the frequency of the actual vibration condition, for example, the material h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/32C08G18/10C08K3/18C08L75/04F16F9/53
CPCC08G18/10C08G2350/00C08K3/18C08G18/3206
Inventor 郇彦刘佳杨小牛
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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