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Polyurethane broadband sound absorption layer for underground acoustic waves

A technology of sound-absorbing layer and polyurethane, which is applied in the direction of sound-emitting devices and instruments, can solve the problem of narrow sound-absorbing frequency band, achieve the effect of improving sound-absorbing frequency band, simplifying the process, and realizing high-efficiency mass production

Active Publication Date: 2016-10-12
洛阳双瑞橡塑科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problem of narrow sound-absorbing frequency band of the existing sound-absorbing structure for underwater sound, the present invention provides a polyurethane broadband sound-absorbing layer for underwater sound waves

Method used

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  • Polyurethane broadband sound absorption layer for underground acoustic waves
  • Polyurethane broadband sound absorption layer for underground acoustic waves
  • Polyurethane broadband sound absorption layer for underground acoustic waves

Examples

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Embodiment 1

[0029] A polyurethane broadband sound-absorbing layer for sound waves in water, such as figure 1 As shown, the structure of the sound-absorbing layer is wedge-shaped or conical, and the sound-absorbing layer is an equidistant three-layer composite structure. The sound-absorbing layer is composed of a polyurethane matrix and a sound-absorbing filler embedded in the polyurethane matrix.

[0030] Among them, the weight percentage of each material that makes up the sound-absorbing layer is: polyurethane matrix 72%, sound-absorbing filler 28%; polyurethane matrix is ​​composed of polymer polyol, diisocyanate, small molecule polyol and plasticizer, each material in polyurethane matrix The weight percentage of the total weight of the polyurethane matrix is: polyether polyol 22%, diisocyanate 30%, small molecule polyol 44% and plasticizer 4%. The density of the sound-absorbing layer is 1100kg / m 3 , the acoustic impedance of the sound-absorbing layer matches that of water. Under the s...

Embodiment 2

[0033] A polyurethane broadband sound-absorbing layer for sound waves in water, such as figure 2As shown, the structure of the sound-absorbing layer is wedge-shaped or conical, and the sound-absorbing layer is a non-equidistant two-layer composite structure. The sound-absorbing layer is composed of a polyurethane matrix and a sound-absorbing filler embedded in the polyurethane matrix.

[0034] Among them, the weight percentage of each material that makes up the sound-absorbing layer is: polyurethane matrix 80%, sound-absorbing filler 20%; polyurethane matrix is ​​composed of polymer polyol, diisocyanate, small molecule polyol and plasticizer, each material in polyurethane matrix The percentage of the weight of the polyurethane matrix to the total weight of the polyurethane matrix is: polyether polyol 15%, diisocyanate 20%, small molecule polyol 61% and plasticizer 4%. The density of the sound-absorbing layer is 1000kg / m 3 , the acoustic impedance of the sound-absorbing layer...

Embodiment 3

[0037] A polyurethane broadband sound-absorbing layer for sound waves in water, such as image 3 As shown, the structure of the sound-absorbing layer is wedge-shaped or conical, and the sound-absorbing layer is a non-equidistant three-layer composite structure. The sound-absorbing layer is composed of a polyurethane matrix and a sound-absorbing filler embedded in the polyurethane matrix.

[0038] Among them, the weight percentage of each material that makes up the sound-absorbing layer is: polyurethane matrix 50%, sound-absorbing filler 50%; polyurethane matrix is ​​composed of polymer polyol, diisocyanate, small molecule polyol and plasticizer, each material in polyurethane matrix The percentage of the weight of the polyurethane matrix to the total weight of the polyurethane matrix is: polyether polyol 25%, diisocyanate 30%, small molecule polyol 35% and plasticizer 10%. The density of the sound-absorbing layer is 1500kg / m 3 , the acoustic impedance of the sound-absorbing la...

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Abstract

The invention discloses a polyurethane broadband sound absorption layer for underground acoustic waves. The sound absorption layer is a composite structure of at least two layers and consists of a polyurethane matrix and sound absorption filler inlaid in the polyurethane matrix; by adopting one or a combination of more methods of changing the particle size of the sound absorption filler in different layers, changing the plot ratio of the sound absorption filler and changing the hardness of the polyurethane matrix, the sound absorption layer forms an anisotropic acoustic gradient layer; the sound absorption layer consists of 50-80% of polyurethane matrix and 20-50% of sound absorption filler; and the polyurethane matrix consists of 15-25% of polymer polyalcohol, 20-30% of diisocyanate, 35-61% of small molecular polyalcohol and 4-10% of plasticizer. In the invention, a disperse acoustic cavity of any pore diameter can be directly formed in the material; with certain acoustic gradient structure, the sound absorption layer realizes gradual incidence of acoustic waves into the material, multi-layer acoustic reflection is formed in the material, the acoustic loss travel is prolonged, and the sound absorption property is enhanced.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic engineering, in particular to a polyurethane broadband sound-absorbing layer for underwater acoustic waves. Background technique [0002] So far, sound-absorbing structures for sound waves in water are usually composed of high-loss rubber or polyurethane materials, made into a plate or cone shape, and the tip of the cone shape is the sound wave incident end. After optimization and adjustment of materials and structures, this type of structure will obtain excellent sound absorption performance in a certain frequency band. However, the sound absorption frequency band of this type of structure is narrow, and the thickness or length of the structure must be long enough to obtain broadband sound absorption effect. Especially in order to enhance the low-frequency sound absorption capability, an additional acoustic cavity structure is often required inside the structure. However, this method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08K3/34C08K7/00C08K3/40C08K3/08C08K3/04G10K11/168
CPCC08G18/6674C08G2350/00C08K3/04C08K3/08C08K3/34C08K3/40C08K7/00C08K2201/003G10K11/168
Inventor 尹绪超陈灵鸽赵进方
Owner 洛阳双瑞橡塑科技有限公司
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