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Soft polyurethane foam and resonant cavity structure formed by same

A technology of soft polyurethane and resonant cavity, which is applied in the direction of instruments, sound-generating devices, etc., can solve the problems of multi-process and complicated process, and achieve simple preparation process, increase internal friction and viscous resistance, and excellent sound absorption and noise reduction effect Effect

Active Publication Date: 2021-06-29
SHANGHAI UNIVERSITY OF ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is necessary to carry out carboxylation pretreatment of the iron powder as the added material, which requires many procedures and complicated processes.

Method used

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  • Soft polyurethane foam and resonant cavity structure formed by same
  • Soft polyurethane foam and resonant cavity structure formed by same
  • Soft polyurethane foam and resonant cavity structure formed by same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Put the treated PU foam into the petri dish, use 300nm particle size Al 2 o 3 The suspension is soaked and cultivated, so that the suspension is not over the surface of the foam, soaked for about 1 hour, the foam is clipped out with tweezers, put into another petri dish, and dried at 80°C until it is completely dry, and then placed at room temperature for a period of time For cooling, get Al 2 o 3 -PU foam. The 4206 type impedance tube is used, and the principle of the impedance tube to measure the sound absorption performance of the material is based on the transfer function method. Its principle is to decompose the broadband steady-state random signal into incident waves p i and the reflected wave p r ,p i and p r The size is determined by the sound pressure measured by two microphones installed on the pipe, and the sound absorption coefficient of the foam material (normal incidence sound absorption coefficient) is calculated.

[0038] figure 1 PU foam and Al...

Embodiment 2

[0041] The preparation method of Example 2 is carried out on the basis of Example 1, and the test method is as described in Example 1. Al will be prepared 2 o 3 -PU foam is bonded with plexiglass to form a resonant cavity structure, and air cavities of different heights are selected. The Al 2 o 3 - PU foam and plexiglass adhesive are epoxy resin and curing agent, and the configuration volume ratio is epoxy resin: curing agent = 5:1. The plexiglass structure is a circular bottom plate with a thickness of 5mm and a diameter of 100mm and a glass wall with a thickness of 5mm and an outer diameter of 100mm. 2 o 3 - PU foam cut to a diameter of 90mm and placed in this structure. The selected air cavity heights are 0mm and 10mm, Al 2 o 3 - The thickness of the PU foam is 20mm, and the height of the glass wall is 20mm and 30mm respectively.

[0042] Figure 4 It is the physical picture of the resonant cavity structure prepared in Example 2 of the present invention. The air ...

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Abstract

The invention relates to soft polyurethane foam and a resonant cavity structure formed by the soft polyurethane foam. Aluminum oxide nanoparticles are attached to a framework of the soft polyurethane foam, and the resonant cavity structure is formed by the soft polyurethane foam. Compared with the prior art, the invention has the advantages of simple preparation process, better sound absorption and noise removal effects and the like.

Description

technical field [0001] The invention relates to the technical field of polyurethane sound-absorbing material products, in particular to a soft polyurethane foam and a resonant cavity structure formed therefrom. Background technique [0002] With the continuous development of our country's economy and the continuous progress of society, the accompanying environmental problems have attracted more and more attention from the country and the people. At present, people are mainly polluted by four types of pollution problems: water pollution, air pollution, solid waste and noise pollution. bothered by. Among them, noise pollution has an increasing impact on the lives of the people. How to control noise pollution and reduce the harm of noise to the human body is also on the desks of scientific researchers. The control of low-frequency noise in substations (converter stations) has attracted increasing attention, and the use of sound-absorbing materials to reduce noise has become on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08K3/22C08J9/40G10K11/162G10K11/172
CPCC08J9/40C08J9/0066G10K11/162G10K11/172C08J2375/04
Inventor 袁斌霞方欣怡张建功周兵刘健犇刘艳蒙绍新朱瑞韩清鹏
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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