Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A polyurethane broadband sound-absorbing layer for underwater sound 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: 2018-09-14
洛阳双瑞橡塑科技有限公司
View PDF6 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A polyurethane broadband sound-absorbing layer for underwater sound waves
  • A polyurethane broadband sound-absorbing layer for underwater sound waves
  • A polyurethane broadband sound-absorbing layer for underwater sound waves

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

A polyurethane broadband sound-absorbing layer for underwater sound waves. The sound-absorbing layer has a composite structure of at least two layers. The sound-absorbing layer is composed of a polyurethane matrix and sound-absorbing fillers embedded in the polyurethane matrix. The particle size, the volume ratio of the sound-absorbing filler, and the hardness of the polyurethane matrix are combined in one or more ways to make the sound-absorbing layer form a heterogeneous acoustic gradient layer; the sound-absorbing layer is composed of a polyurethane matrix of 50 to 80 %, sound-absorbing filler 20-50%, polyurethane matrix is ​​composed of polymer polyol 15-25%, diisocyanate 20-30%, small molecule polyol 35-61% and plasticizer 4-10%. The invention can directly form dispersed acoustic cavities with arbitrary apertures inside the material; the sound-absorbing layer has a certain acoustic gradient structure, which realizes the gradual incidence of sound waves into the inside of the material, and forms multi-level acoustic reflection inside the material, increasing the sound loss stroke, Improve sound absorption performance.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com