Sound absorber, and preparation method and application thereof

A technology of sound absorbing body and porous matrix, which is applied in the direction of sound-producing equipment, instruments, etc., can solve the problem of limited improvement of sound absorbing performance, and achieve the effect of broadening the frequency range of sound absorbing, enhancing sound absorbing ability and improving sound absorbing coefficient.

Inactive Publication Date: 2020-03-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology is to use a single polyurethane foam layer to improve the sound absorption performance by adjusting the formula, but the improvement of the sound absorption performance of the sound-absorbing material is limited by simply adjusting the formula.

Method used

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  • Sound absorber, and preparation method and application thereof
  • Sound absorber, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this embodiment, the foaming material includes component A: 100 parts by weight of polyether polyol (1027 commercially purchased from Zhejiang Yongjie Automotive Electronics Co., Ltd., with a number average molecular weight of 5000 g / mol, a functionality of 3, and a hydroxyl value of 26-30, viscosity is 900-1100mPa s), crosslinking catalyst A33 (purchased from Huntsman Company) 0.5 parts by weight, foaming catalyst A1 (purchased from Huntsman Company) 0.2 parts by weight, silicone oil 9800, 0.8 parts by weight 3 parts by weight of water; Component B: 40 parts by weight of modified MDI isocyanate (Wanhua Chemical, trade number 8053).

[0042] The preparation method of the sound absorbing body is as follows:

[0043] Mix the above components A and B evenly and pour them into the mold for foaming. The temperature of the mold is 50°C. After demoulding, a porous matrix in the shape of a cylinder is obtained. The rate is 90%, the density is 90kg / m 3 , the axial thickness...

Embodiment 2

[0045] The materials and preparation method of Example 1 are used, except that, for the openings formed by laser drilling, the distance between the centers of two adjacent openings is 5 mm.

Embodiment 3

[0047] The materials and preparation method of Example 1 were used, except that the diameter of the holes formed by laser drilling was 3 mm.

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Abstract

The invention relates to a sound absorber, and a preparation method and an application thereof. The sound absorber comprises a porous substrate, wherein foamed holes are distributed in the porous substrate; the porous substrate is provided with a main surface; and a plurality of openings are distributed in the part or all of the main surface, hole diameters of the openings are 0.5-8mm, depths of the openings are 2-20mm, and spacing between centers of the two adjacent openings is 0.5-10mm. The sound absorber is provided with the porous substrate that has a certain sound absorption property, andmeanwhile, the openings with specific hole diameters, depths and hole spacing are formed in the main surface of the porous substrate, so that a structural sound absorption layer with a specific shapeis formed; low frequency sound absorption performance can be improved via a resonant sound absorption mechanism; and the structural sound absorption layer effectively enhances sound absorption ability of the porous substrate, significantly improves a sound absorption coefficient of a whole frequency band, and broadens a sound absorption frequency range of the sound absorber, and thus broadband sound absorption is achieved.

Description

technical field [0001] The present disclosure relates to the field of automotive NVH materials, in particular to a sound absorbing body and its preparation method and application. Background technique [0002] At present, the noise of electric vehicles and hybrid vehicles includes: high-frequency noise of motor noise, engine noise and low-frequency noise of pump body for electric vehicles, and their frequency characteristics show broadband. Therefore, it is necessary to design sound-absorbing materials with high sound-absorbing performance and broadband. In the prior art, a single polyurethane foam layer is used to improve the sound absorption performance by adjusting the formula, but the improvement of the sound absorption performance of the sound-absorbing material is limited only by adjusting the formula. Contents of the invention [0003] The purpose of the present disclosure is to provide a sound absorbing body and its preparation method and application. The sound ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162C08G18/48
CPCC08G18/4829G10K11/162
Inventor 宫清张敏吴波陈石养卢强基
Owner BYD CO LTD
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